Injection Molding
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Flash at the Parting Line of PBT
Problem Phenomenon
Flash and burrs appear at the parting line of PBT products.
Cause Analysis
The melt viscosity of PBT is relatively low and the fluidity is good, so it easily overflows from the parting line; the clamping force is insufficient; the injection pressure is too high.
Solution
Increase the clamping force; repair the flatness of the parting line; appropriately reduce the injection pressure; use a precision parting line design.
Key Takeaway
PBT has good fluidity and is prone to flash, which needs attention.
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