Molds & Tooling
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PC Hot Runner Gate Stringing
Problem Phenomenon
Hot runner products string and hang material at the gate, affecting the appearance of the next shot, gate residue needs manual cleaning.
Cause Analysis
Too high hot runner temperature or insufficient gate cooling causes the melt to be drawn into strings when the mold opens; poor valve pin action and improper timing also cause stringing; PC's high-viscosity melt strings more obviously.
Solution
①Optimize the hot runner temperature curve; ②Strengthen gate area cooling; ③Check valve pin timing and wear; ④Appropriately reduce the nozzle temperature; ⑤Shorten the mold-open waiting time.
Key Takeaway
For PC stringing, check 'hot runner temperature control and valve pin action': temperature and timing are the two major variables; the state of the hot runner system directly determines gate quality and must be included in regular inspection.
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