Molds & Tooling
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PVDF Sheet Multi-Point Gate Design
Problem Phenomenon
【Problem phenomenon】Single-gate molding of PVDF sheets has excessive flow length, with insufficient end filling and weld lines coexisting
Cause Analysis
Sheets have large area and long flow paths, and temperature and pressure decay severely at the flow end of a single gate; multi-point gates shorten flow length but bring weld line layout problems; During on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based solely on experience
Solution
Use multi-point gates in sheet molds to shorten melt flow distance; optimize gate positions by simulation so weld lines avoid high-stress and appearance areas; match with sufficient clamping force to prevent flash; After adjustment, take consecutive samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
Large sheets rely on multi-point gates to divide the flow length; weld line positions must be pre-controlled by simulation; After confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence; Include this case in the defect archive as a reference for troubleshooting similar problems in the future
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