Injection Molding
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ASA chevron surface defect
Problem Phenomenon
ASA weather-resistant product surface shows chevron (chevrons) patterns, accompanied by uneven haze and step-shaped defects, positions related to the flow front.
Cause Analysis
Academic research confirms that ASA '2079851475616104452 surface defects originate from flow instability: recoverable shear strain, shear stress and mold wall friction coefficient are the key control factors; melt slip instability forms the characteristic pattern.
Solution
①Reduce injection speed to reduce shear stress and recoverable strain; ②raise mold temperature to reduce melt-mold wall friction difference; ③optimize gate to avoid high-speed direct impact; ④adjust material grade viscosity if necessary.
Key Takeaway
ASA chevron defect is a rheological instability problem rather than a conventional process defect; the three elements of shear strain, stress, and friction are the governance direction; academic mechanism guides parameter adjustment more efficiently.
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