Manufacture

Things to note when color correcting and producing injection molded purple PVC parts Color calibration for injection-molded purple PVC parts is crucial for ensuring the product’s appearance quality. Purple is a sensitive color and is easily affected by factors such as the type of masterbatch, addition ratio, and process parameters. Therefore, the calibration process requires exceptional care. First, a dedicatedMore

Pay attention to several process parameters that affect injection molding quality During the injection molding process, process parameters directly determine product quality, with injection pressure being a crucial factor. Injection pressure refers to the pressure exerted by the injection molding machine’s screw as it pushes the molten material into the mold cavity. Its magnitude depends on the product’s structure, theMore

Injection mold base design Injection mold frame design is a fundamental step in mold design, directly affecting the mold’s overall performance, service life, and manufacturing cost. Factors such as the product’s size, shape, production batch, and injection molding machine parameters must be comprehensively considered during the design process. The mold frame’s overall structure must possess sufficient strength and rigidity toMore

Injection mold exhaust method The venting of injection molds is crucial to the quality of the product. If the venting is poor, air will be trapped during the molten material filling process, resulting in defects such as bubbles, material shortages, and burning in the product. Common venting methods include parting surface venting. Parting surface venting is to set a smallMore

Injection mold classification There are various ways to classify injection molds, and they can be divided into multiple categories based on different standards. These classifications help to accurately select the appropriate mold according to the product requirements in actual production. According to the type of plastic being processed, it can be divided into thermoplastic molds and thermosetting plastic molds. ThermoplasticMore

Injection mold base The mold frame of an injection mold is the mold’s foundational support component, much like the frame of a building. It provides installation, positioning, and support for the mold’s molding components, guide mechanisms, and ejection mechanisms. Its precision and rigidity directly impact the mold’s overall performance and service life. The mold frame typically consists of a fixedMore

Basic structure and types of injection molds The basic structure of an injection mold is the foundation for molten plastic to be molded into a finished product. It consists of multiple components with different functions working together to complete the molding process, including feeding, plasticizing, injection, pressure holding, cooling, and demolding. Although the structure of an injection mold varies dependingMore

The lateral core pulling mechanism of the injection mold is a key device to solve the problem of lateral concave-convex structure or side hole molding of the product. When the product has holes, grooves or bosses that are inconsistent with the mold opening direction, if the lateral core pulling mechanism is not used, the product will not be able toMore

Injection mold molding size calculation Calculating injection mold dimensions is a core step in mold design, directly impacting the dimensional accuracy and assembly performance of the molded part. Molding dimensions refer to dimensions directly related to the mold cavity and core, which are directly related to the product’s dimensions. Their calculation must comprehensively consider factors such as plastic shrinkage, moldMore

Solutions and machine adjustment techniques for serious color mixing of injection molded parts Severe color mixing in injection molded parts is a common quality issue in production. This can manifest as discolored streaks, spots, or overall uneven color on the surface of the product, affecting not only the appearance but also potentially leading to product rejection and increased production costs.More

Time, temperature and pressure distribution during injection molding process During the injection molding process, the distribution of time, temperature, and pressure are core elements that are interrelated and influence each other. The precise control of the three directly determines the quality stability and production efficiency of the product. Time parameters mainly include injection time, holding time, cooling time, etc. TemperatureMore

Special measures when injection molding white or transparent products Injection molding white or transparent products places extremely high demands on production processes and environments. Any tiny impurity or process defect can cause problems such as black spots, yellowing, or turbidity, affecting the product’s appearance and performance. Therefore, when producing these products, a series of special measures must be implemented, strictlyMore

The key component of the injection device – the screw The screw is a core component of the injection molding machine’s injection mechanism, responsible for conveying, melting, mixing, and pressurizing plastics. Its structural design and performance directly impact the quality and efficiency of injection molding. The screw typically consists of a screw head, compression section, metering section, and feeding section.More

Injection molding injection rate During the injection molding process, injection rate is one of the key parameters that determine product quality. It directly affects the flow state of the melt in the mold cavity, the filling effect, and the physical properties of the final product. The injection rate refers to the volume or mass of the melt injected from theMore

Injection molding main channel design The injection molding sprue is a critical channel connecting the injection molding machine nozzle and the runners. Its design directly impacts melt flow characteristics, pressure loss, and part quality. The sprue’s primary function is to smoothly guide the molten plastic from the nozzle into the mold while simultaneously transmitting injection and holding pressure to ensureMore

Diameter and position design of straight-through cooling water channel for injection molding Through-the-channel cooling channels are the most common design in injection molding mold cooling systems. By creating straight holes through the mold plate, circulating cooling water removes heat from the melt, enabling rapid cooling and finalization of the molded part. The diameter and placement of through-the-channel cooling channels directlyMore

The injection molding booster clamping unit is an advanced device that uses a boosting mechanism to increase clamping force. It is widely used in the production of large, precision plastic parts, particularly when high clamping force is required but the base tonnage of the injection molding machine is insufficient. Its core principle is to add a booster cylinder or force-increasingMore

Methods to prevent black spots on transparent and light-colored plastic parts Transparent plastic parts (such as PC lenses and PMMA lampshades) and light-colored plastic parts (such as white PP housings and light-colored ABS components) have extremely high requirements for appearance quality. Black specks are one of the main defects that affect their pass rate. Black specks are often caused byMore

The reason why the shrinkage problem of hard plastic parts is more difficult to solve than that of soft plastic parts Shrinkage in injection molded parts is caused by uneven volumetric shrinkage during melt cooling, manifesting as surface depressions or internal shrinkage cavities, impacting both the product’s appearance and mechanical properties. Practice has shown that shrinkage in rigid plastics (suchMore

Factors affecting runner design in injection molding As a critical channel connecting the main runner and the gate, the rationality of the injection molding runner’s design directly impacts the melt’s flow characteristics, part quality, and production efficiency. The runner’s primary function is to evenly distribute the melt from the main runner to each cavity while minimizing pressure loss and meltMore

Overflow (flash, burr) and its solution Flash (also known as burr or flash) is one of the most common defects in injection molding. It manifests as excess, thin flakes of plastic at the edge or parting surface of a plastic part. This not only affects the product’s appearance but can also cause assembly difficulties, dimensional deviations, and, in severe cases,More

Considerations for mold arrangement for multi-cavity injection molding Injection molds with multiple cavities produce multiple parts in a single injection molding cycle, significantly improving production efficiency and reducing unit product costs. They are widely used in the mass production of small plastic parts such as bottle caps and electronic connectors. However, the layout design of multi-cavity molds is complex. ImproperMore

Hydraulic – Double toggle clamping device The hydraulic-toggle clamping mechanism is a core component of modern injection molding machines. Combining the flexibility of hydraulic transmission with the force-amplifying properties of a double-toggle mechanism, it provides stable clamping force and ensures precise molding of plastic parts. It is widely used in various injection molding applications, from microelectronic components to large automotiveMore

Extending the cross runner can reduce the spray marks and chatter marks of PC injection molded parts PC (polycarbonate) is widely used in high-end plastic parts such as optical lenses and medical devices due to its excellent light transmittance, impact strength, and heat resistance. However, PC is prone to producing shot and chatter marks during injection molding, which can affectMore

Multi-stage adjustment techniques to prevent gas marks when rapid filling is required Rapid filling is an important means of improving injection molding production efficiency, especially for thin-walled plastic parts and materials with poor fluidity. However, rapid filling can easily cause turbulence in the melt within the mold cavity, entraining air to form air streaks, which appear as silver or blackMore

Considerations for cavity arrangement Cavity arrangement is a crucial aspect of multi-cavity injection mold design, directly impacting melt filling uniformity, mold force balance, and part quality consistency. Proper cavity arrangement ensures simultaneous filling of all cavities and even pressure distribution, minimizing dimensional deviation and performance fluctuations in the molded parts caused by filling variations. Conversely, an improper arrangement can resultMore

Injection molding inclined surface precise positioning mechanism The precise positioning mechanism for injection molding’s inclined surface alignment is a key device for ensuring precise alignment between the mold cavity and core. It’s particularly suitable for molds for large, complex plastic parts. Through the guiding and positioning effects of the inclined surface, the mold alignment error can be controlled within 0.01-0.03mm,More

Main parameters of injection molding inclined ejector mechanism The performance of the injection molding ejector mechanism depends on the proper design of a series of key parameters, which directly affect the core-pulling effect, motion stability, and plastic part quality. As the core device for demolding complex plastic parts, the ejector mechanism’s parameter design must take into account multiple factors, includingMore

Injection molding inclined top side core pulling mechanism The lateral core-pulling mechanism for injection molding is a crucial device for demolding parts with internal undercuts or complex curved surfaces. By tilting the ejector rod, it simultaneously performs lateral core-pulling operations while ejecting, combining both ejection and core-pulling functions. It is widely used in the production of plastic parts with internalMore

Wedge rod-triangular slider type first reset mechanism The wedge-shaped rod-triangular slider pre-reset mechanism is a key device in injection molds used to prevent interference between the side core pulling mechanism and demolding elements such as the push rod. It drives the triangular slider through the inclined surface of the wedge-shaped rod, causing the push rod to reset in advance, ensuringMore

Injection molding material unsmooth and solutions Unsmooth material feeding during injection molding is a common process problem in injection molding. It manifests as material bridging within the hopper, blockage in the barrel feed port, and uneven screw feeding. These problems directly lead to poor melt plasticization and unstable injection volume, which in turn causes defects such as part shortages, dimensionalMore

Lateral core pulling mechanism for injection molding bent pins The bent-pin lateral core-pulling mechanism for injection molding is a key device for demolding complex parts with lateral projections, holes, and other structures. It utilizes the inclined surface of the bent pin to drive a slider to perform the core-pulling operation. It boasts a compact structure, high core-pulling force, and reliableMore

Selection of injection molding release agent Injection molding release agents are key auxiliary materials that reduce friction between the plastic part and the mold, ensuring smooth demolding. Their selection directly impacts part quality, production efficiency, and mold life. High-quality release agents form a uniform, lubricating film on the mold cavity surface, reducing adhesion between the part and the mold, reducingMore

Injection molding push block specifications, materials and heat treatment Injection molding push blocks are important components for demolding complex plastic parts. Their specifications, material selection, and heat treatment process directly affect the demolding effect and service life. Push blocks are typically used to mold bosses, ribs, or irregular surfaces of plastic parts. They need to fit tightly with the surfaceMore

In injection molding, push rods and push tubes are not only important demolding components, but their rational design also directly affects the effectiveness of gas discharge within the mold cavity. Traditional concepts often overlook the exhaust function of push rods and push tubes. In fact, by providing specific structures on push rods and push tubes, they can effectively assist inMore

Arrangement of injection molding push rod The placement of injection molding push rods is a core element in mold release system design, directly impacting the release and appearance quality of the molded part. As the most commonly used demolding element, the push rod ejects the molded part from the core or cavity after mold opening. The rationality of its placementMore

Key points in designing ejector plate demoulding for injection molding Push-plate demolding in injection molding is a highly efficient demolding method suitable for deep-cavity, thin-walled parts. Using a push-plate that conforms to the inner or outer surface of the part, it pushes the entire part out of the mold cavity during demolding. This method offers advantages such as uniform demoldingMore

Injection molded breathable steel exhaust During the injection molding process, the smooth escape of gas from the mold cavity is crucial for ensuring part quality. However, traditional venting methods often have limitations when dealing with complex parts. This is why injection molding venting technology using breathable steel has emerged. Breathable steel is a specialized steel with a uniform microporous structure,More

Insufficient transparency of injection molded parts and solutions The transparency of injection-molded parts is a core quality requirement for many high-end products, such as medical infusion sets, food packaging containers, and optical lenses. Insufficient transparency can directly impact product functionality and market competitiveness. Insufficient transparency in injection-molded parts manifests primarily as high surface haze, low gloss, and internal cloud-like streaksMore

Avoid color deviation caused by local overheating. Mold temperature indirectly changes the color of injection molded parts by affecting the crystallization state and cooling rate of the plastic. For crystalline plastics such as PP and PE, too low a mold temperature will lead to excessively rapid crystallization and uneven grain size, resulting in a frosty appearance on the surface ofMore

Injection molding machine adjustment skills: slow first then fast injection method and its application During the injection molding process, speed control during the injection phase directly impacts part quality and production efficiency. The “slow-first, fast-later” injection method, a classic machine tuning technique, demonstrates significant advantages for complex parts and defect-prone applications. This method essentially divides the injection process into twoMore

Effective measures to improve injection molding quality Improving injection molding quality is a core goal of injection molding production, directly impacting product performance, appearance, and service life, while also impacting a company’s market competitiveness. Injection molding quality is influenced by multiple factors, including raw materials, equipment, molds, and process. Problems in any of these steps can lead to defects inMore

Cooling circuit for special cores for injection molding Special cores in injection molds refer to molded parts with complex structures and unique shapes, such as slender cores, special-shaped cores, and deep-cavity cores. Their cooling performance directly impacts part quality and production efficiency. Due to the irregular geometry of special cores, traditional cooling methods struggle to achieve uniform cooling, which canMore

Injection shrinkage is a common quality defect in injection molding production, manifesting as depressions, sink marks on the surface of the plastic part, or voids inside the part. This not only affects the product’s appearance, but can also weaken its structural strength. This phenomenon often occurs in areas with uneven wall thickness, corners, or near ribs. It is essentially causedMore

Molding process requirements for plastic products The molding processability of plastic products refers to the plastic material’s adaptability to specific molding methods (such as injection molding, extrusion, and blow molding). It directly determines production efficiency, product quality, and production costs, and is a crucial factor in product design and material selection. Good processability means the material is easy to moldMore

Testing of plastic melt flow properties Plastic melt flow is a key indicator of the plastic’s fluidity in the molten state, directly impacting the feasibility and stability of molding processes like injection molding and extrusion. Its testing is a crucial quality control step before plastic processing. Plastics with poor melt flow (such as highly filled PP) are prone to defectsMore

Plastic color matching Plastic color matching is the process of mixing different colored colorants in specific proportions to achieve a target color. Its core objectives are to achieve precise color matching, batch stability, and environmental adaptability. It is widely used in fields with stringent appearance requirements, such as home appliances, automobiles, and toys. Color matching quality directly impacts a product’sMore

Modification and properties of plastics Plastic modification is a technique that changes the structure and composition of polymers through physical, chemical, or mechanical means to improve their mechanical, thermal, and processing properties, thereby expanding their application range. Unmodified general-purpose plastics (such as PE and PP) have limited performance and are difficult to meet the requirements of complex working conditions (suchMore

Insufficient strength of plastic parts and solutions Insufficient plastic part strength refers to the breaking, deformation, or cracking of plastic parts under designed loads, making them unable to meet usage requirements and a serious defect that impacts product reliability. Insufficient strength can manifest in various ways: insufficient tensile strength can cause plastic parts to break, insufficient impact strength can causeMore

Dimensional accuracy of plastic parts The dimensional accuracy of plastic parts refers to the degree of conformity between the actual dimensions of the plastic part and the designed dimensions. It is one of the core indicators for measuring the quality of plastic parts and directly affects the assembly performance and usability of the product. In industrial production, dimensional accuracy isMore

Relationship between plastic part wall thickness and cooling time The relationship between part wall thickness and cooling time is a core principle in the injection molding process, directly impacting production efficiency and part quality. The underlying logic is that increasing wall thickness leads to a nonlinear increase in cooling time. Because plastics have low thermal conductivity (typically 0.1-0.3 W/(m・K) ),More

Injection molding nozzle material release mechanism The injection molding sprue ejector is a mold device that automatically separates the plastic part from the runner condensate (sprue material). Its core function is to mechanically cut and eject the sprue material from the gate during the mold opening or ejection process, automating the separation of the plastic part and sprue material, reducingMore

A dual-ejection mechanism for injection molding is a complex mold structure that enables simultaneous or step-by-step ejection of a plastic part from both the cavity and core. It is primarily used in situations where the part’s clamping force on both the cavity and core is high, and unidirectional ejection can easily cause deformation or damage. This includes deep-cavity box-shaped partsMore

Injection molding trial process and parameter debugging Injection molding trials are a critical step before mass production of new products. By conducting molding tests on actual molds and equipment, the rationality of mold design is verified, process parameters are optimized, and potential defects are identified and resolved, providing a reliable basis for mass production. The trial mold process must followMore

Problems that may arise from using long nozzles and their remedies Long nozzles (usually referring to injection nozzles with a length exceeding 100mm) are widely used in injection molding production because they can adapt to the molding requirements of deep-cavity molds or special-structured plastic parts. However, their slender structure can easily cause a series of problems, affecting molding stability andMore

Injection molding burn (carbonization) Injection scorch (carbonization) is the appearance of black, charred spots, streaks, or areas on or within a plastic part. It’s a serious defect in injection molding, not only damaging the product’s appearance but also potentially generating toxic gases due to material degradation, impacting production safety and part performance. It’s essentially the result of thermal oxidative degradationMore

Injection molding color difference and solution Injection molding color variation refers to the difference between the color of a plastic part and a standard color palette, including deviations in hue, brightness, and saturation. It is one of the main defects affecting the appearance quality of plastic parts, especially in areas such as automotive exteriors and home appliance housings, where colorMore

Maintenance of injection molding lubrication system The lubrication system of an injection molding machine is crucial for ensuring the proper operation of all moving parts (such as guides, lead screws, and bearings). Its core function is to reduce friction and wear, lower energy consumption, and extend equipment life through the use of lubricating oil or grease. Lubrication points in anMore

Injection Molding Weld Marks and Solutions Injection molding weld lines are linear marks formed on or within a plastic part due to the meeting of two or more melt stream fronts. They are common cosmetic and performance defects in melt molding, particularly prominent in complex parts or molds with multiple gates. They are caused by poor fusion of the meltMore

Hot injection nozzle specifications and parameters The hot injection nozzle (also known as the hot nozzle) is a key component in the hot runner system that connects the hot runner plate and the cavity. Its specifications and parameters directly affect the melt delivery efficiency, plastic part quality, and mold compatibility, and must be accurately selected based on the type ofMore

Hot runner injection mold Hot runner injection molds are specialized molding tools that integrate a hot runner system. By adding heating and temperature control components to traditional molds, they achieve continuous melting of the melt within the runners. They are the core technology behind hot runner injection molding. Their basic structure includes a cavity, core, hot runner plate, nozzle, heatingMore

Hot runner injection molding is an advanced plastic molding technology. Its core principle is to use a heating device to keep the plastic melt in the runner in a constant molten state, avoiding the formation of agglomerates in traditional cold runner systems, thereby achieving separation of the plastic part from the runner. In traditional injection molding, the melt flows throughMore

Insulation and positioning of injection molding hot runner plates The insulation and positioning of injection molding hot runner plates are crucial for the proper operation of hot runner systems, directly impacting melt temperature stability, energy consumption, and mold life. As a key component for melt distribution, the hot runner plate must maintain a stable operating temperature (typically 180-300°C). However, itsMore

Determine the number of cavities in injection molding Determining the number of cavities in an injection mold is a key decision in injection molding production planning, directly impacting production efficiency, cost control, and product quality. It requires comprehensive consideration of multiple factors, including part size, production batch size, equipment capacity, and economic benefits. The number of cavities refers to theMore

Warping (deformation) and solutions Warpage (deformation) in injection molded parts refers to the unintended bending, twisting, or buckling of a molded part after cooling. It’s a common defect that affects product dimensional accuracy and is particularly prominent in thin-walled, elongated, or asymmetrical parts. The underlying cause is uneven internal stress within the part. When this stress is released, the partMore

Submerged gate condensate removal mechanism The latent gate slurry ejection mechanism is a key device used in injection molds to automatically separate slurry from latent gates. Its core function is to mechanically separate and eject the slurry from the gate during mold opening, achieving automated separation of the part and slurry, significantly improving production efficiency. Because latent gates are locatedMore

Air bubbles (cavitation) and their solutions In injection molding, air bubbles (cavitation) refer to cavities or bubbles that appear inside or on the surface of a plastic part. Their causes are complex and can affect the mechanical properties and appearance of the finished product. These bubbles can be categorized as vacuum bubbles and gas bubbles. Vacuum bubbles are often causedMore

Injection molding pneumatic demoulding Pneumatic demolding for injection molding utilizes the thrust of compressed air to separate the plastic part from the mold. It is widely used in the production of thin-walled, large, or complex-shaped plastic parts. Its core principle involves placing air holes in specific locations within the mold cavity or core. Once the part has cooled after molding,More

Injection nozzle temperature The injection nozzle temperature is a crucial parameter in the injection molding process, directly impacting melt flow, product quality, and production efficiency. As the key component connecting the barrel and mold, the nozzle’s temperature must be coordinated with the barrel’s temperature to ensure optimal melt entry into the mold cavity. Excessively low temperatures can cause the meltMore

Injection molding spray pattern (snake pattern) Injection molding spray marks, also known as serpentine marks, are common surface defects in injection molding. They appear as irregular ripples or twisting marks formed when the melt flows in the mold cavity, seriously affecting the appearance quality and mechanical properties of the product. The core reason for its formation is that the meltMore

Determining the degree of plastic decomposition is an important topic in the fields of materials science and environmental engineering. Its methods require a comprehensive analysis combining chemical, physical, and biological properties. Thermogravimetric analysis (TGA) is one of the commonly used methods. By monitoring the mass changes of plastics during programmed temperature increase, the decomposition stage can be accurately determined. ForMore

Injection molding built-in small tie rod fixed distance parting mechanism The built-in tie-rod spacing parting mechanism in injection molding is a sophisticated device that controls the parting sequence and distance in three-plate molds. Its core function is to limit the mold opening stroke using a small tie-rod (typically 8-16mm in diameter) built into the mold plate. This saves more spaceMore

Application experience of slide mechanism of injection molding inner mold The inner mold slide mechanism (also known as the inner core pulling mechanism) is a key device for preventing internal undercuts (such as internal threads and grooves) in plastic parts. Its design requires a balanced core pulling force, stroke, and mold space. A cosmetic bottle cap mold with internal threadsMore

Injection mold maintenance management Injection mold maintenance management is critical to ensuring production continuity and reducing costs. A comprehensive preventive maintenance system, including daily inspections, regular maintenance, and fault warning mechanisms, is essential. Daily inspections should focus on the wear of vulnerable parts (such as ejector pins, guide pins, and seals). A production line, during a five-minute pre-shift inspection, discoveredMore

Injection mold design drawing inspection Injection mold design drawing inspections must first review the rationality of the part model to ensure that the part structure meets the requirements of the injection molding process. This serves as the foundation for subsequent design. The part’s wall thickness should be uniform, with variations within 30%. For one part, the wall thickness suddenly changedMore

Acceptance of injection molds The acceptance of injection molds begins with an inspection of their appearance and structure to ensure that the mold as a whole meets design requirements and operating specifications. This is the foundation of the acceptance process. First, check that the mold markings, including information such as the mold number, number of cavities, and weight, are clear.More

Cost of Injection Molds The cost structure of injection molds is complex, involving multiple steps, including design, materials, processing, and assembly. Material costs account for approximately 30%-40% of the total cost, making them the fundamental factor influencing total costs. The choice of mold steel directly determines material costs. Ordinary carbon structural steel (such as S50C) costs approximately 8 yuan perMore

Determination of injection mold frame size The size of an injection mold frame should be determined based on the part size and mold structure. The primary consideration is the impact of the cavity layout on the mold frame length and width, ensuring sufficient clearance between cavities and between cavities and the mold frame edge (typically ≥30mm). For a 100×80mm partMore

Injection molding spiral cooling water channel Spiral cooling channels in injection molding, thanks to their uniform distance from the mold cavity surface, excel in cooling complex curved parts (such as automotive headlights and mobile phone cases). They effectively reduce temperature differences across the part. For example, in a car bumper mold, the use of spiral channels reduced surface temperature differencesMore

Calculating the pitch of injection-molded threaded rings and threaded cores is crucial for ensuring the precise fit of plastic part threads. This requires comprehensive consideration of the plastic’s shrinkage characteristics, thread accuracy, and the molding process. The basic formula for calculating thread pitch is: Mold thread pitch = Part thread pitch × (1 + Shrinkage). Shrinkage must be determined experimentallyMore

Maintenance of injection molding screw and barrel Maintenance of injection molding screws and barrels is fundamental to extending equipment life and ensuring production stability. Its core focus is to reduce wear, prevent corrosion, and maintain proper clearances. Proper maintenance can extend equipment life by 30-50%. On one production line, through standardized maintenance, the screw replacement interval was extended from 15,000More

Several process parameters affecting injection molding quality Injection pressure is a key parameter affecting injection molding quality, directly determining whether the melt can fill the mold cavity and form a dense part. Its setting should be determined based on a comprehensive consideration of material flowability, part wall thickness, and mold resistance. Too low an injection pressure can lead to underfillingMore

Barrel and screw cleaning Barrel and screw cleaning is a critical step before material changes or shutdowns in injection molding production. Its purpose is to remove residual melt, degradation products, and impurities, preventing performance degradation or cosmetic defects caused by the mixing of different materials. Incomplete cleaning can lead to a range of problems. For example, in the production ofMore

Injection molding uses push plate to cut off the gate material mechanism The push-plate mechanism used in injection molding to cut off the sprue material is a key feature for automated production, particularly in three-plate molds or hot runner molds. The push-plate’s axial movement separates the sprue material from the molded part. The cut is typically made at the junctionMore

Flow velocity and flow rate of injection molding cooling water channel under stable turbulent flow The flow velocity and flow rate in injection molding cooling channels under stable turbulent conditions are key parameters for ensuring cooling efficiency. Turbulent flow (Reynolds number > 4000) breaks down boundary layer thermal resistance, increasing heat transfer efficiency 3-5 times higher than laminar flow (ReMore

Injection cooling time The injection molding cooling time accounts for the largest portion of the molding cycle (typically 50%-70%), directly impacting production efficiency and part quality. Its core objective is to cool the part below its thermal deformation temperature to ensure dimensional stability after demolding. Cooling time should be calculated based on the part’s maximum wall thickness. For parts withMore

Injection molding cold spots and solutions Cold slug spot in injection molding is a common surface defect in plastic parts, appearing as dark spots or streaks, often located near the gate or at the transition point of the melt flow. This occurs when the cold front of the melt enters the mold cavity and fails to fully merge with theMore

Distance mechanism that controls the opening sequence of the three-plate mold Three-plate molds enable multi-point feeding and precise gate control for complex plastic parts, making them widely used in precision injection molding. The distance mechanism that controls the mold opening sequence is crucial for ensuring safe mold operation and part quality. This mechanism requires precise control of the distance andMore

Mirror logos (logos) are a key aesthetic element of high-end plastic parts. Melt impact marks on their surfaces can severely impact the product’s quality. These defects manifest as radial or streaky shiny marks around or within the logo’s edges. These marks are caused by turbulent flow caused by the high-speed melt impacting the mold cavity surface. The mirror logo onMore

Shrinkage issues in precision injection molding Shrinkage in precision injection molding is a key factor affecting product dimensional accuracy. It arises from the volumetric contraction of the melt during cooling from a viscous flow state to a solid state. For plastic parts requiring ±0.01mm precision (such as optical lenses and precision gears), even slight fluctuations in shrinkage can result inMore

Injection molding machine adjustment method to solve air trapping in dead corners Dead-corner air entrapment during the injection molding process occurs when the melt is unable to escape quickly from complex structures such as corners, deep cavities, and ribs during mold filling. This pressure builds up, leading to high pressure and defects such as scorching, missing material, and bubbles inMore

Comparison of injection molding processes for crystalline and amorphous plastics The molecular structure differences between crystalline plastics (such as PP, PA, and POM) and amorphous plastics (such as ABS, PC, and PMMA) lead to significant differences in their injection molding process parameters, primarily reflected in the setting of the molding temperature range. Crystalline plastics have a clear melting point andMore

Composition of injection molding gating system The injection molding gating system consists of four core components: the main runner, branch runners, gate, and cold well. These components work together to ensure smooth melt flow from the injection molding machine nozzle into the mold cavity. The main runner is the critical channel connecting the nozzle and the branch runners. The mainMore

Creation of injection molding gating system The creation of an injection molding gating system requires a structural analysis of the plastic part. A preliminary plan is developed based on material properties and molding process requirements. The key to this stage is determining the location and number of gates. A mobile phone case made of ABS material required a surface freeMore

The benefits of enlarging gates and runners Enlarging the gate and runner can significantly improve melt flow properties during injection molding, especially for high-viscosity materials or those containing glass fiber. For example, an automotive engine bracket made of PA66+GF40 originally had an 8mm runner diameter and a 2mm gate diameter . Excessive shear rates during melt flow caused glass fiberMore

Management of nozzle material (runner condensate) at the machine position Timely cleaning of sprue material at the machine station is fundamental to ensuring continuous injection molding production. Establishing a standardized cleaning process can effectively reduce downtime losses caused by sprue material accumulation. A home appliance injection molding workshop has established a “clean each mold, summarize every hour” management standard: OperatorsMore

Lateral core pulling mechanism of the slider and inclined guide column The lateral core pulling mechanism using a slider’s inclined guide pin is a classic structure for achieving horizontal or inclined core pulling in injection molds. Its key feature lies in the angle matching between the guide pin and the slider’s guide slot. Typically, the angle of the guide pinMore

The connection method between the slider and the side core pull directly affects the motion accuracy and load-bearing capacity of the core pull mechanism. In injection mold design, the selection must be based on the undercut characteristics of the plastic part, production batch, and material properties. Among common rigid connection methods, bolt fastening is the most widely used. High-strength hexagonMore

Slider, hydraulic inclined core pulling and inclined slider three-way core pulling A three-way core-pulling mechanism using a slider, hydraulic inclined core puller, and inclined slider is an integrated solution for multi-directional undercut demolding of complex plastic parts. It is widely used in precision injection molds in the automotive and home appliance industries. A certain automobile engine hood features undercuts inMore

Application experience of rear mold slide mechanism The rear mold slide mechanism is a key device for achieving undercut demolding in injection molds for complex plastic parts. The rationality of its design directly determines product quality and production stability. In the production of automotive interior parts, a dashboard side cover had three internal undercuts. A rear mold inclined guide postMore

Injection molding transition fillet Injection molding transition radius is a key element in plastic part design, connecting different wall thicknesses or curved surfaces. Its proper design can significantly improve a product’s mechanical properties and molding stability. At corners, using right-angle transitions can easily generate eddy currents during melt flow, leading to increased localized pressure loss. Furthermore, stress concentration zones formMore

Injection Molding Light Spot (Ghosting) and Solutions Injection molding flare, also known as ghosting, is an irregular pattern of light or dark spots that appear on the surface of a plastic part. It is particularly noticeable on black or dark-colored parts, severely impacting the product’s appearance. This defect primarily stems from variations in the melt’s flow path within the moldMore

Injection molding bulge and its solution Injection molding bulges are a common surface defect in plastic parts, appearing as localized outward protrusions. This not only affects the product’s appearance but can also weaken its structural strength. This defect often stems from uneven shrinkage during melt cooling. When thick, inadequately cooled areas exist within the part, the outer layer solidifies first,More

Application example of injection molding spacer cooling water channel In precision injection molding production, the design of the cooling system directly affects product quality and production efficiency. The spacer-type cooling water channel, with its efficient heat exchange capacity, has shown significant advantages in the processing of complex plastic parts. Take the injection molding of the automobile instrument panel frame asMore

Flow characteristics of polymers during molding The flow characteristics of polymers during the molding process refer to the behavior of the polymer melt as it flows under pressure through channels such as the barrel, runners, and cavity. This characteristic directly impacts the filling, holding, and cooling stages of the molding process, determining the dimensional accuracy, surface quality, and internal structureMore

Degradation of polymers during molding Polymer degradation during the molding process refers to the breakage or chemical structural changes of polymer chains caused by external factors such as heat, mechanical forces, oxygen, and moisture. This process reduces the polymer’s molecular weight and mechanical properties, thereby affecting the quality and service life of the plastic part. Degradation not only causes cosmeticMore

Composite injection molding demolding is a combined demolding mechanism designed to address the challenges of demolding complex plastic parts. It organically combines two or more single demolding methods (such as ejector pin, ejector plate, inclined ejector, and pneumatic ejector) to achieve smooth and efficient demolding of plastic parts through collaborative operation. Compared to single demolding methods, composite demolding can handleMore

Injection molding parting surface venting Venting at the injection mold parting surface is a crucial aspect of injection mold design. It involves installing a specialized venting structure at the mold’s parting surface to expel air trapped in the cavity during filling and gases generated by the decomposition of the plastic melt. During injection molding, if the gas in the cavityMore

Injection runner form The injection molding runner is a crucial component of the gating system, connecting the main runner and the gate. Its primary function is to smoothly and evenly distribute the molten plastic from the main runner to the various gates before it enters the mold cavity. The rationality of the runner design directly affects the melt’s flow resistance,More

Injection molding anti-delay (screw loosening amount) The injection molding anti-slip margin, also known as screw back-out, is a critical process parameter in the injection molding process. It refers to the distance the screw moves back after the injection phase. Setting this seemingly simple parameter has a direct and significant impact on injection molding stability, part quality, and raw material utilization.More

Other basic structures of secondary demoulding A secondary ejection mechanism is a specialized structure used in injection molds to address issues such as molded parts remaining stuck or deforming after primary ejection. In addition to the common ejector plate and ejector pin composite structure, a variety of other basic structural forms exist. These structures utilize different operating principles and combinationsMore

Advantages of multi-stage injection molding Multi-stage injection molding is an injection molding technology that divides the injection process into multiple stages based on the structural characteristics of the plastic part and molding requirements, and independently controls parameters such as injection speed and pressure in each stage. Compared to traditional single-stage injection molding, this technology can more precisely control the flow,More

Movable mold inclined top, fixed mold T-shaped block composite core pulling In injection mold design, when a part features complex undercuts, side holes, or undercuts, a single core-pulling mechanism often fails to meet demolding requirements. However, a composite core-pulling mechanism combining a movable mold slant and a fixed mold T-block, thanks to its synergistic nature, effectively addresses the demolding challengesMore

Injection molding constant resistance lubrication Among the lubrication methods used in injection molding equipment, constant-resistance lubrication, with its unique operating principle, plays a vital role in specific moving parts. This lubrication method regulates the lubricant supply volume and speed by controlling the flow resistance of the lubricant in the lubrication system, ensuring a stable and appropriate amount of lubricant toMore

Assembly of injection molded locating ring The injection molding locating ring is a crucial component connecting the injection molding machine to the mold. Its primary function is to ensure accurate installation and positioning of the mold on the machine, ensuring precise alignment of the mold’s sprue bushing with the machine’s nozzle, allowing the molten plastic to enter the mold cavity.More

During the operation of injection molding equipment, lubrication of all moving parts is a critical step in ensuring the proper functioning of the equipment and extending its service life. Quantitative pressurized lubrication for injection molding has been widely used in modern injection molding machines due to its precision and efficiency. This lubrication method uses a specialized lubrication system to deliverMore

Solution to the problem of dragging during injection molding of electroplated molds Electroplated molds, with their smooth surface, high hardness, and excellent wear resistance, are often used in injection molding for high-performance parts, such as exterior and transparent components. However, in actual production, electroplated molds sometimes exhibit a phenomenon called “scratching.” This occurs when the mold surface scrapes the partMore

Single Cavity Flow Balance Example In injection molding, while single-cavity molds don’t require the same considerations as multi-cavity molds regarding flow balance between cavities, ensuring uniform melt flow and filling within a single cavity remains crucial for part quality. Single-cavity flow balance ensures that the molten plastic flows along the intended path and velocity during cavity filling, filling all areasMore

Pneumatic demoulding of large plastic parts Due to their large size and weight, traditional mechanical demolding methods often face numerous challenges, such as insufficient demolding force and the potential for deformation or damage. However, pneumatic demolding has gained widespread application in large plastic part production due to its unique advantages. Pneumatic demolding utilizes compressed air pressure to inject air betweenMore

Solutions to deformation problems of large-sized planar plastic parts During the injection molding process, large, flat plastic parts are prone to deformation, such as warping, bending, and denting, due to their structural characteristics (such as large area, relatively uniform thickness, and low rigidity). These deformations not only affect the part’s appearance but also reduce its assembly precision and performance. Therefore,More

Calculation of injection molding core pulling distance In injection mold design, the core pulling mechanism is a critical component for handling complex features on plastic parts, such as side holes, undercuts, and bosses. Accurately calculating the core pulling distance is essential for ensuring proper function and smooth part demolding. The core pulling distance refers to the minimum distance the coreMore

Injection molding filling analysis Injection filling analysis is a crucial step in the injection molding process, directly impacting part quality, production efficiency, and mold life. During injection molding, molten plastic is forced through the gating system into the mold cavity under pressure. The flow state, pressure distribution, and temperature changes during this process significantly impact the final product. Scientific andMore

Injection molding gear rack tilt side core pulling mechanism The tilted rack-and-pinion lateral core-pulling mechanism for injection molding is a complex mechanism that utilizes a rack-and-pinion transmission to achieve tilted core pulling. It is suitable for molding parts with inclined concave or convex undercuts. Its core-pulling direction forms a specific angle (typically 10°-45°) with the mold opening and closing directions,More

Assembly of injection molded parts The assembly of injection molded parts involves combining the mold’s cavity, core, slider, ejector mechanism, and other components into a complete mold according to design requirements. The quality of this assembly directly impacts the mold’s operating accuracy, part quality, and production efficiency. The assembly process must strictly adhere to assembly procedures to ensure that theMore

In injection mold design, stays (also known as support posts or ejector plate stays) are key components used to enhance mold strength and prevent mold plate deformation. The proper number of stays directly impacts the mold’s lifespan and the precision of the molded part. Stays primarily serve to protect the mold between the movable mold backing plate and the movableMore

Properties of commonly used plastics As an important polymer material, plastics are widely used across various industries due to their excellent comprehensive properties, including mechanical, thermal, chemical, and processing properties. Different types of plastics exhibit significant differences in performance, and understanding these characteristics is essential for selecting the right plastic. Whether used in everyday items, automotive parts, or electronic andMore

Thermal conductivity of commonly used injection mold materials The thermal conductivity of injection molds is a key performance parameter that influences the quality of plastic part molding and production efficiency. It determines the heat transfer rate and temperature uniformity of the mold during the molding process. Mold materials with high thermal conductivity can quickly transfer heat from the melt, shorteningMore

Design of Slider Positioning Spring in Lateral Core Pulling In the lateral core-pulling mechanism of an injection mold, the slider positioning spring is a critical component that ensures the slider accurately returns to its original position and maintains a stable position after mold opening. Its design directly impacts mold precision and part quality. After completing the core-pulling action, the slider,More

Two slider (slide) structures that are not conducive to injection molding production In injection mold design, the slider (or runner) is a critical component for creating undercuts or convexities on plastic parts. The rationality of its structural design directly impacts mold life, production efficiency, and part quality. However, certain slider designs can exhibit numerous issues in actual production, hindering smoothMore

Injection molded surface floating fiber Surface fiber removal refers to the phenomenon of fibers being exposed on the surface of a fiber-reinforced plastic part during the injection molding process. This phenomenon manifests as white or gray fiber spots or streaks, severely affecting the part’s appearance and potentially degrading its surface and mechanical properties. Surface fiber removal primarily occurs in partsMore

Injection holding pressure During the injection molding process, holding pressure is a key parameter determining part quality, directly impacting its dimensional accuracy, density, and mechanical properties. The holding phase is a crucial step following the filling phase. Its primary function is to continue replenishing the mold cavity as the melt contracts during cooling, compensating for the volumetric shrinkage caused byMore

Injection molding white spots and solutions White specks are a common cosmetic defect in injection molding production. They appear as white spots or streaks on or within the surface of a plastic part, affecting not only the product’s appearance but, in severe cases, its mechanical properties. The causes of white specks are complex and varied, involving various factors, including rawMore

Dimensions and Control Issues of POM Plastic Parts (Steel Parts) POM plastic parts, also known as steel parts, are widely used in the automotive, electronics, and machinery industries due to their excellent mechanical properties, wear resistance, and fatigue resistance. However, controlling dimensional accuracy has always been a prominent issue in the production of POM plastic parts. Dimensional deviations not onlyMore

In injection molding, gate air marks on PC parts have long been a major headache for many manufacturers. They not only affect the product’s appearance but can also weaken its structural performance. Gate air marks typically appear as cloud-like or silvery streaks near the gate. In severe cases, they can even form visible air bubbles. Addressing this issue requires aMore