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What are the consequences of poor exhaust of plastic injection molds?

Update:16-03-2022
Summary:

1. The gas undergoes china mould a large compression to […]

1. The gas undergoes china mould a large compression to generate a back pressure, and this back pressure increases the resistance of the molten material to fill the mold, preventing the molten plastic from filling the mold normally and quickly, so that the mold cavity cannot be filled, resulting in unclear plastic edges.

2. There are obvious flow marks and weld seams on the product, and the mechanical properties of the product are reduced.

3. After the gas is compressed, it will penetrate into the inner layer of the plastic, causing the plastic to produce surface quality defects such as silver streaks, pores, loose tissue, and delamination

4. After the gas in the cavity is compressed, heat is generated and the local temperature of the plastic rises, the plastic melt is decomposed and discolored, and even charred and carbonized.

5. Poor exhaust, reducing the filling speed, increasing the cycle of forming parts (especially high-speed injection molding), seriously affecting production efficiency.