Extrusion & Post
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PC Product Flaking (Delamination)
Problem Phenomenon
Layered peeling appears at the edges or gate of PC products, and in severe cases the surface layer can be torn off.
Cause Analysis
Excessive shear causes severe molecular orientation of the surface layer and weak interlayer bonding; or incompatible impurities are mixed in, or excessive release agent; PC is highly shear-sensitive, and the gate area is a high-incidence location.
Solution
①Enlarge the gate and reduce the speed through the gate to reduce shear; ②Investigate material mixing and contamination, standardize raw material and regrind management; ③Control the amount of release agent to avoid a surface isolation layer; ④Increase the mold temperature to ease molecular orientation and internal stress; ⑤Check the compatibility of regrind and base material.
Key Takeaway
PC delamination is checked from both ends of 'shear and contamination': gate shear is the process inducement, contamination is the material inducement; delamination is an interface problem, find the root cause first before talking about the process.
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