Molds & Tooling
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PA6 Flame-Retardant Grade Processing
Problem Phenomenon
Flame-retardant PA6 parts show increased brittleness and color deviation, and corrosion marks appear on the mold
Cause Analysis
The flame-retardant system reduces PA6 toughness and makes it more heat-sensitive; when overheated, the flame retardant decomposes and releases corrosive gas that attacks the mold; screw shear heat superimposed on the set temperature easily makes the actual melt temperature exceed the standard
Solution
①Press the screw surface speed of flame-retardant grades below 0.2m/s; ②Strictly manage melt temperature according to the grade upper limit; ③Use stainless steel for the mold to resist corrosive gas attack
Key Takeaway
Flame-retardant PA6 is doubly sensitive to shear and temperature; speed reduction, temperature control and corrosion-proof molds are three hard requirements for stable production; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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