Microsoft silver streak

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If the barrel temperature is too high or the heating is imbalanced, the barrel temperature should be lowered step by step. If the temperature of the feeding section is too high, part of the plastic will melt prematurely and fill the groove, making it impossible to vent the air through the feeding port.

When the injection speed is too fast, the molten plastic will be decomposed by the large shear force, and gas is accordingly generated; if the injection speed is too slow, the product cannot be filled in time, causing an insufficient surface density, and thus the silver streaks.

Insufficient material, too large feeding buffer, too low material temperature or too low mold temperature will affect the fluidity and molding pressure of the melt, and thus generate voids. During pre-molding, if the screw backpressure is too low and the speed is too high, the screw will return too fast, so that the air is easily pushed to the front end of the barrel together with the material.

A large amount of dust is mixed into the raw materials or mixed with the pellets, which is easy to entrain air during the melting process, and sometimes silver streaks are caused.

When the raw materials are contaminated or there is too much dust, the raw materials are easily decomposed when being heated.