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Connection of injection screw barrel and pp plastic

Por Cathy Lin October 9th, 2024 vistas 5
‌ The connection between injection screw barrel and PP plastic mainly involves plasticizing, injection and mold forming processes. ‌

The connection process of injection screw barrel and PP plastic can be divided into the following steps:

‌ Plasticizing process ‌ : in the plasticizing barrel, the screw plasticizes PP plastic uniformly. Through the rotation of the screw and the heating of the barrel, the PP plastic is melted and evenly mixed. This process uses the shear heat and friction heat generated by the rotation of the screw to make PP plastic reach a molten state ‌.
‌ Injection process ‌ : The molten PP plastic enters the injection barrel through the check valve, and then is pushed into the mold cavity by the plunger or screw. During injection, the molten PP plastic is injected into the mold and fills the cavity ‌.
‌ mold molding ‌ : The molten PP plastic is cooled and solidified in the mold to form the required plastic parts. The design and manufacture of molds have an important impact on the quality and appearance of the final product ‌.
In order to ensure the effective connection between the injection screw barrel and PP plastic, the following points need to be noted:

‌ screw material selection ‌ : for PP plastic, usually use ordinary screw nitride, this screw after special process treatment, nitriding layer depth of 0.5-0.8mm, the overall hardness of HV980~1080°, suitable for processing ordinary plastics such as PP‌.
‌ temperature control ‌ : in the plasticizing process, it is necessary to control the temperature of the barrel and screw to ensure that the PP plastic can be uniformly melted and avoid local overheating or non-melting ‌.
‌ mold design ‌ : The design of the mold needs to take into account the fluidity and cooling time of PP plastic to ensure the quality of the product ‌.
Through the above steps and precautions, you can ensure the effective connection between the injection screw barrel and PP plastic, and produce high-quality PP plastic products.
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