Injection Molding
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ASA injection pressure setting improper
Problem Phenomenon
ASA products have incomplete filling and poor surface replication at low pressure, and flash and internal stress cracks appear at high pressure; the window is difficult to grasp.
Cause Analysis
Toray recommends an ASA injection pressure range of 70~140MPa; when pressure is too low, the flow end density is insufficient and the surface darkens; when too high, molecular orientation stress and flash coexist; switch to holding pressure immediately after filling ends.
Solution
①Injection pressure set within the 70~140MPa range; ②immediately reduce to holding pressure after filling ends; ③comprehensively adjust in coordination with product shape, gate size and mold temperature; ④solidify parameters with dual indicators of weighing and appearance.
Key Takeaway
The ASA pressure window has a clear supplier guidance range; timely switching between injection and holding pressure is a key action; parameter solidification relies on objective indicators such as weighing.; After confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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