Injection Molding
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Plasticization fluctuation in PP '2079851475616104452
Problem Phenomenon
The plasticizing time fluctuates between long and short, back pressure and current are unstable, and product quality fluctuates accordingly.
Cause Analysis
Poor hopper feeding (bridging), a high proportion of regrind or uneven particle size, and excessive hopper temperature cause fluctuation in screw conveying efficiency; screw wear or improper feed zone temperature also causes unstable plasticization.
Solution
①Check the hopper throat cooling to prevent bridging; ②control the proportion and particle size of regrind; ③check the wear of the screw and barrel; ④stabilize drying and feeding; ⑤monitor plasticizing time as an early warning indicator.
Key Takeaway
For unstable PP plasticization, first check 'feeding': bridging and regrind are common culprits; include plasticizing time in process monitoring—it often alarms before the product goes wrong.
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