Extrusion & Post
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Poor interfacial bonding or delamination in multi-material molding
Problem Phenomenon
Poor interfacial bonding or delamination in multi-material molding
Cause Analysis
Poor compatibility between cellulose acetate butyrate and co-injection material, weak interfacial bonding
Large processing temperature difference between the two materials, process window difficult to match
Large shrinkage rate difference, interfacial stress concentration
Melt flow rates not matched during co-injection
Material degradation or chemical reaction at the interface
Solution
Select co-injection materials with good compatibility with cellulose acetate butyrate
Reasonably set each runner temperature to match the two materials
Consider shrinkage rate difference in design
Adjust injection speed to match flow rates
Verify interfacial bonding strength
Key Takeaway
Co-injection needs to be addressed from compatibility and process matching
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