Injection Molding
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Cushion Control in PBT '2079851475616104452
Problem Phenomenon
The cushion (melt reserve) at the front end of the barrel is insufficient or unstable.
Cause Analysis
The metering stroke is set improperly; the non-return ring is worn and leaks; the back pressure is insufficient and the melt density is low.
Solution
Ensure the cushion amount is 3-6mm; check and replace the non-return ring; appropriately increase the back pressure.
Key Takeaway
The PBT cushion is the reserve of holding pressure.
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