One of the most headache for people who are not very experienced in the processing of two-color plastic moulds is the shrinkage phenomenon that occurs during the processing of two-color plastic moulds. After the plastic products are injection molded and ejected, there will be pits on the surface of the products, especially the parts with uneven material thickness are very obvious, which is what we often call product shrinkage. So how to avoid the shrinkage of two-color plastic mold? The following is how to avoid shrinkage of plastic products introduced by the manufacturer.
Ways to avoid shrinkage of
two-color plastic mould.
I. Start from the mold. For example, you can improve the location of the glue mouth or increase the flow channel to let more glue flow into the cavity. Change the glue port so that the glue inlet is closer to the thicker part of the plastic, so that the thick glue position at the pressure retention effect is better.
II. From the two-color
plastic mold injection molding process to improve the shrinkage. For example, lengthen the holding time, adjust the mold temperature, adjust the injection pressure and time, and other injection parameters to improve the shrinkage situation.
III. After the plastic products are ejected, immediately put them into cold water to speed up the cooling of the injection products, which can alleviate the problem of shrinkage to a certain extent.
IV. Start from the product, change the product. For example, the reduction of rubber, shrinkage is mainly due to the uneven thickness of the product material leads to different cooling time of the product, and cooling faster thin material bit will pull the thick material bit at the plastic. Then it will cause the thick bit of material at the glue is not enough to form a pit. So we can reduce the thickness of the thick material to alleviate the problem of shrinkage of the two-color plastic mold.
Latest blog posts
Custom molds injection molding
Custom molds injection molding is a manufacturing process that involves creating custom molds to produce plastic parts. Injection molding is a popular technique used in various industries such as...
Plastic injection molding companies
Plastic injection molding is a manufacturing process that involves injecting molten plastic into a mold to create a wide range of plastic products. From car parts to medical devices and household items, plastic injection molding is used to create a variet
PET Preform Injection Moulding Machine
PET preform injection molding is a manufacturing process that is used to create PET (polyethylene terephthalate) preforms that can be later blown into bottles, jars, and other containers. This process...
You may like
Gas-assisted injection molding
Gas-assisted injection molding is a process in which high-pressure nitrogen gas is injected directly into the plastic being plasticized in the mold cavity through the main and auxiliary controllers...
Factors affecting the cooling rate of products in injection molding
Plastic product design: mainly the wall thickness of plastic products. The greater the thickness of the product, the longer the cooling time. Generally speaking, the cooling time is proportional...
Top 10 factors affecting the quality of injection molds
Mold manufacturing is a complex process, from design, processing, assembly, commissioning, and other steps to the final real use, in the whole life cycle, 10 main factors affect the quality of the mold as follows...
Plastic shrinkage of common problems and solutions on
Plastic shrinkage is the problem of plastic shrinkage,1. Four kinds of plastic shrinkage,Thermal shrinkage, phase change shrinkage, orientation shrinkage, compression shrinkage and elastic recovery...