JUYE Technology, a TPE thermoplastic elastomer manufacturer with 19 years of experience — provides you with comprehensive R&D and production solutions for TPE, TPR, TPV, TPV-SiR, TPU, and TPEE materials.
Since 2008, we have expanded into a broad range of industry application markets, providing rich solutions for various industries, with numerous application cases for your reference.
The processing and production technology of TPE materials is relatively complex, requiring strict control of the process parameters and operating conditions at each stage.
Juye Technology has gone through nearly 20 years of steady development and has established a comprehensive and thoughtful service support system.
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JUYE Technology's sustainable development aims to carry out low-carbon production under the premise of protecting the Earth's green environment, participate in global economic cooperation and innovation practices, establish harmonious and symbiotic relationships with partners, contribute to the country, promote the development of the enterprise, and seek welfare for employees.
Dongguan JUYE Plastic Technology Co., Ltd. is a TPE thermoplastic elastomer company integrating research and development, production, and sales.
When a material is molded, it will shrink due to cooling, resulting in a product size smaller than the mold size. The molding shrinkage rate is expressed as a percentage to indicate the degree of shrinkage. Generally, crystalline resins shrink more than amorphous resins. The molding shrinkage rate can be moderately adjusted by adjusting molding conditions such as injection temperature and pressure.
When a material is molded, it will shrink due to cooling, resulting in a product size smaller than the mold size. The molding shrinkage rate is expressed as a percentage to indicate the degree of shrinkage. Generally, crystalline resins shrink more than amorphous resins. The molding shrinkage rate can be moderately adjusted by adjusting molding conditions such as injection temperature and pressure.
The shrinkage range of TPE is 1%~2.5%, and that of engineering plastics is 0.2%~1.4%. It is recommended that the thickness of the substrate be twice the thickness of the TPE product. Adding ribs on the substrate's overmolding surface will cause heat shrink marks on the outer surface after TPE molding. When TPE material is fully encapsulated over engineering plastics, attention should be paid to warpage caused by thermal shrinkage.
Causes of shrinkage:
In the molding process, due to changes in pressure and temperature, differences in shrinkage may occur.
In the injection molding process, if TPE only undergoes heating and cooling, the shrinkage rate of the TPE filled into the mold cavity can be considered for refilling. However, in reality, due to simultaneous changes in pressure and temperature, differences in shrinkage still occur.
Process of shrinkage:
During injection molding, TPE expands in volume after being heated and melted.
After the expanded molten TPE is filled into the confined mold cavity, cooling is applied. During this process, the volume of TPE decreases, and the volume reduction rate at this point is the molding shrinkage rate.
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