Material Drying
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PBAT '2079851475616104452 silver streaks and bubbles
Problem Phenomenon
PBAT injection molded products have surface silver streaks and internal bubbles, caused by insufficient drying or degradation gas generation from excessive temperature.
Cause Analysis
PBAT has strong moisture absorption and drying is not thorough; barrel temperature too high causes thermal decomposition; screw back pressure too low mixes in air; injection speed too fast traps air; mold venting is poor.
Solution
①Fully dry to control moisture content; ②set barrel temperature according to manufacturer standards; ③appropriately increase back pressure; ④segmented control of injection speed; ⑤optimize mold venting.
Key Takeaway
Drying and temperature are the main causes of gas defects in PBAT '2079851475616104452; segmented injection is the standard anti-air-trap technology; venting design cannot be omitted.; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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