Causes and analysis of gas generated by injection mold
The reason why the mold generates gas when manufacturing the product
1 In the feeding system, the material entrains the gas or the air originally exists in the cavity. During the forming process, the gas in the flow channel and the cavity is not discharged in time.
2 The resin is insufficiently dried, contains water, and evaporates at the injection temperature to become water vapor.(injection mold)
3 The injection temperature is higher, and the plastic decomposes to generate gas.
4 Some additives in the resin, volatilization or chemical reaction to form a gas (for example, when the thermosetting plastic is formed, not only the plastic itself contains moisture and volatile components, but also undergoes a polycondensation reaction during the curing process to produce a condensation water and a low molecular volatile gas).
5 residual gas in the resin.
The consequences of poor mold exhaust
1 The gas undergoes large compression to generate a back pressure, and this back pressure increases the resistance of the molten material to the mold filling flow, prevents the molten plastic from filling normally and rapidly, and the mold cavity cannot be filled, resulting in unclear edges of the plastic.
2 The visible visible flow marks and fusion joints on the product show that the mechanical properties of the parts are degraded.
3 After the gas is compressed, it will infiltrate into the inner layer of the plastic, causing the surface quality defects such as silver streaks, pores, looseness of the structure, and peeling of the plastic.
4 After the gas in the cavity is compressed, heat is generated to increase the local temperature of the plastic, and the plastic melt decomposes and discolors, and even burns carbonization.
5 poor exhaust, reduce the filling speed, increase the cycle of part forming (especially high-speed injection molding), seriously affecting productivity.
Kayou, a plastic mold manufacturer, was founded in 2002. It specializes in the manufacture of injection molds and plastic molded parts. It is a plastic molding factory for Chinese molding solutions suppliers, providing one-stop service for your project. Mold, "molding parts manufacturing, printing, assembly and timely delivery and low-cost packaging services.
A song machine for electronic medicine or automotive construction, offering custom plastic molding and plastic molding dies, in the home electronics industry.
Thanks to the team of Japanese precision machinery injection mold manufacturing experience for 18 years, we can ensure tolerance and quality assurance.
We have more than 16 injection molding machines, from 80T to 300T in the injection workshop, we can have 600T-1600T injection molding machines to help us serve our customers.
We can help you from concept to trading, designing products, making prototypes, manufacturing injection molds and mass production, assembly and packaging, and even shipping to your warehouse.
Design is the core, high-quality injection molds start with good design, 80% of our engineers have more than 15 years of experience, our design director worked in the Japanese factory before, and has 35 years of industry experience.