Extrusion & Post
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ASA co-extrusion layer thickness unevenness
Problem Phenomenon
The ASA weathering layer thickness on the surface of ASA/ABS co-extruded sheet is uneven, the base material is partially exposed, weathering performance is inconsistent, and color difference is distributed along the width direction.
Cause Analysis
Unbalanced flow resistance of each layer in the co-extrusion die leads to uneven layer thickness distribution; the melt viscosity difference between ASA and ABS makes interface flow unstable; die lip adjustment and temperature settings do not match.
Solution
①Optimize the co-extrusion die distributor to balance the flow of each layer; ②match the processing temperatures of the two materials to narrow the viscosity difference; ③fine adjustment of die lip bolts; ④closed-loop control of layer thickness with online thickness gauge.
Key Takeaway
The weathering resistance of ASA co-extruded sheet depends on surface layer thickness uniformity; viscosity matching is the core of layer stability; online thickness measurement is the guarantee of batch consistency.; After confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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