The characteristics of transparent plastics and injection molding process, do you know?
Due to the advantages of light weight, good toughness, easy molding and high cost, more and more plastics are used to replace glass in modern industry and daily products, especially in the optical instruments and packaging industry, which is developing especially rapidly. However, because it requires good transparency, high wear resistance and good impact resistance, a lot of tasks have to be done in the composition, process, configuration, and mold of plastic throughout the injection molding...
What are the causes of excessive burrs on injection molded products?
Excessive burrs usually occur on the parting surface, i.e. between the moving mold and the static mold, the sliding part of the slider, the gap of the insert, the hole of the ejector rod, etc., forming excess melt on the injection molded product. Such a burr, which will be pried during the molding process, will further increase the burr, thus causing a partial depression of the mold, and the burr forms an expanding vicious circle. Therefore, if a flash point burr is found for the first time,...
Four common causes of airline defects in injection molded products
Throughout the injection molding process, airline defects are a common defect in the processing of plastic parts. What are the general causes of this defect? 1. Mismatch between injection molding equipment and injection molding products. The choice of injection molding equipment should be reasonable. If the sum of the weight of the product and the gate aggregate is less than 20% of the maximum injection volume, the remaining raw material will be decomposed by the shearing force generated by the...
Principle and process requirements of two-color injection molding
I. The meaning of two-color injection molding Two-color injection molding is a molding method of injecting two different colors of plastic in the same mold. It can make the plastic parts appear in two different colors, and can make the plastic parts appear in regular patterns or irregular cloud-like colors to improve the practicality and beauty of the plastic parts. Second, the principle of two-color injection molding Two-color mixed injection molding Two-color grinder It has two barrels, and...
Four common causes of airline defects in injection molded products
Throughout the injection molding process, airline defects are a common defect in the processing of plastic parts. What are the general causes of this defect? 1. Mismatch between injection molding equipment and injection molded products. The choice of injection molding equipment should be reasonable. If the sum of the weight of the product and the gate aggregate is less than 20% of the maximum injection volume, the remaining raw material will be decomposed by the shearing force generated by the...
The influence of injection molding process on product quality
There are two kinds of product quality, namely: the quality of internal material and the quality of appearance. The quality of the inner material mainly refers to the mechanical strength, and the size of the internal stress directly affects the mechanical strength of the product. The main cause of internal stress is the crystallinity of the product and plastic molding. The orientation of the molecules is determined. The appearance quality of the product refers to the surface quality of the...
How to reduce the bad smell produced by injection molding plastic processing?
It is well known that plastic parts processed products emit an unpleasant smell. In order to overcome this problem to meet the needs of customers, the production of plastic parts has long been committed to reducing the divergence level of these odors. This paper gives a brief summary of the current methods for reducing odor in the production of plastic parts processing plants: 1, using a more pure resin In many plastics, especially in plastics such as polyvinyl chloride, styrene, polyethyl...
How to optimize the injection molding process to improve the plating performance of PC/ABS?
Electroplated PC/ABS parts are used more and more widely in the home appliance, automotive and IT industries. It is believed that the main factors affecting the plating performance of PC/ABS are material formulation design and electroplating process, however, few people will pay attention to the influence of injection molding process on electroplating performance. Today Xiaobian analyzes the impact of injection molding process on PC/ABS plating performance: Injection temperature Higher...
14 injection molding defect solutions
The 14 injection molding defect solutions are as follows: Short shot Short shot refers to a situation in which the injected product is incomplete due to the mold being not completely filled. This defect usually occurs at the point farthest from the gate, or in the part that needs to be reached through a narrow part of the mold, because the narrow part may hinder the flow of the melt. Short shots may cause very small marks, and may also cause a significant loss of a large part of the product....
What is the impact of injection molding on gas?
Gas is often generated in injection molds and may be related to the following: The air contained in the casting system and the mold cavity. Some raw materials contain moisture that is not removed by drying, and they are vaporized into water vapor at high temperatures. Due to the high temperature during injection molding, some unstable plastics will decompose and produce gas. Some additives in plastic materials volatilize or react with each other to form a gas. At the same time, the reason for...
Special plastic PEEK injection molding process
The general process of PEEK injection molding is as follows: 1. Drying: The particulate polymer generally absorbs 0.5% w/w of atmospheric moisture. For best results, it should be dried until the moisture is less than 0.02% w/w. The material can be placed in an air circulating oven, dried at least at 150 ° C for 3 hours, or dried at 160 ° C for 2 hours. If it is dried in a dry box, the thickness of the raw material in the tray should not exceed 25 mm and prevent contamination. 2. Recycling: The...
Solution for cracking during PMMA acrylic injection molding
Acrylic products generally crack during injection molding, so what kind of solution should we take when cracking occurs? The main reason for this is due to stress deformation. There are mainly residual stresses, external stresses, and stress deformations caused by the external environment. Crack caused by residual stress Residual stress is mainly caused by the following three conditions, namely, overfilling, demolding, and metal inserts. As a crack generated in the case of excessive filling,...
How to solve the problem of poor mold release of injection molding products?
Poor mold release, also known as the mold flow path, is due to poor contact between the injection port and the nozzle arc, and the gate material is not demolded together with the product and the abnormal filler. Typically, the diameter of the main flow path is large enough that the gate material is not fully cured during the demolding process. Regardless of the mold flow path or the product sticking to the cavity, the mold release is the most important killer in plastic injection molding. The...
How much is the low pressure injection molding process?
The low-pressure injection molding process is a packaging process that uses a very low injection pressure to inject a hot melt material into a mold and quickly cures it. It achieves insulation, temperature resistance and resistance with excellent sealing properties and excellent physical and chemical properties of Henkel hot melt materials. Impact, vibration, moisture, water, dust, chemical corrosion, etc., play a good role in protecting electronic components. Compared with traditional potting...
Analysis of warpage, bending and twisting problems in injection molding
The warpage, bending and twisting problems of injection molding are as follows: 1. Insufficient cooling or unevenness When it is not fully cooled, the top thrust of the ram tends to deform the molded part, so if it is not sufficiently cooled, the mold release will be deformed. The countermeasure is to fully cool in the cavity, and then to fully eject before ejecting. It is also possible to reduce the mold temperature and extend the cooling time. However, some of the molds have insufficient...
What is the impact of the injection molding process on product performance?
The proportion of plastic materials in life is getting higher and higher, and the requirements for its quality are getting higher and higher. Injection molding is an important means of production, and the improvement of technology is becoming more and more urgent, and the influencing factors of injection molding products More, but the injection molding process conditions are one of the important influencing factors, the following Jiuzhi Plastics Network will introduce the impact of individual...
Analysis of the application of two-color injection molding on the cup
The concept of two-color injection molding: Two-color injection molding refers to a molding method in which two different color plastics are injected into the same mold. It can make the plastic parts appear in two different colors, and can make the plastic parts have a regular pattern or irregular cloud-like color to improve the practicality and aesthetics of the plastic parts. Two-color injection molding on the cup: In the process of manufacturing the water cup, we use the characteristics of...
What are the major factors of injection molding?
The factors of injection molding are as follows: 1, pressure The operating pressure provided by the pressure system (oil pump) or motor of the injection molding machine is mainly applied to the injection device, the glue-molding device, the mold-opening device, the ejection device, the shooting device, the core-pulling device, and the like, in the injection molding machine. After the control panel inputs the relevant parameters, the processor converts it into a signal of each program action,...
What are the classifications of plastic injection molding machines?
The plastic injection molding machine works similarly to the syringe for injection. It uses the thrust of the screw (or plunger) to inject the plasticized molten state (ie, the viscous flow) into the closed cavity. The process of obtaining the product after curing and setting. The structure of the injection molding machine, the injection molding machine is divided into a plunger type injection molding machine and a screw type injection molding machine according to the plasticizing method;...
China Plastics Network tells 7 steps of injection molding
The seven steps of injection molding are as follows: 1. Heating, pre-plasticizing The screw drives the material from the hopper forward and compacts under the drive of the transmission system. Under the mixing of the outer heater, the screw and the barrel, the material is gradually melted, at the head of the barrel. A certain amount of molten plastic has accumulated, and the screw slowly recedes under the pressure of the melt. The distance of the retreat is adjusted depending on the amount...
Discussion on the problem of injection molding color masterbatch
Masterbatch is a new type of polymer material colorant with superior coloring properties. However, there may be some problems in the use of color masterbatch. The following is a brief introduction to the reasons and solutions. : 1. In the sunlight, there are strips of pigmented paint in the product: Considering both physical and mechanical properties of plastics and plastic molding processes: The temperature of the injection molding equipment is not well controlled, and the color master cannot...
How much is the PMMA injection molding process?
Polymethyl methacrylate, a polymer obtained by polymerizing acrylic acid and its esters, is collectively referred to as an acrylic resin, and the corresponding plastics are collectively referred to as polyacrylic plastics, of which polymethyl methacrylate is the most widely used. Polymethyl methacrylate is abbreviated as PMMA , commonly known as plexiglass. It is the most excellent synthetic material and the price is suitable. Application: PMMA is soluble in organic solvents such as phenol,...
TPR/TPE injection molding process, do you make it?
Drying of TPR Depending on the characteristics of the material and the feeding conditions, the appearance and process properties of the material should generally be tested prior to molding. The supplied pellets often contain varying degrees of moisture, fluxes and other volatile low molecular weights. In particular, the TPR moisture content with a tendency to absorb moisture always exceeds the limits allowed by the process. Therefore, it is necessary to carry out a drying treatment before...
