Material Analysis
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PVC Profile Low Weld Corner Strength
Problem Phenomenon
After welding of door and window profiles, weld corner strength is insufficient, corners crack, and the whole window's air-tightness, water-tightness and safety are affected.
Cause Analysis
Poor plasticization degree, too high filler in formula or improper welding process (temperature/pressure/time) cause insufficient molecular entanglement at the welding interface; poorly plasticized profiles are 'congenitally deficient', no matter how good the welding is, the strength cannot be made up.
Solution
①Verify the gelation degree of the mixture, ensure plasticization; ②Optimize the three welding elements (temperature/pressure/time); ③Control filler and regrind proportion; ④Use formula materials with qualified strength; ⑤Regularly test weld corner strength.
Key Takeaway
PVC weld corner strength = 'plasticization quality + welding process': plasticization is the foundation, welding is the surface; poorly plasticized material cannot be welded firmly no matter what — ensure plasticization first, then talk about welding parameters.
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