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Problem & Solution

Practical answers to common plastic material challenges

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11636 questions
Q
PVA extruded film has transverse corrugations
A
Transverse corrugations are caused by haul-off vibration and roller eccentricity; equipment overhaul and stable control are the key
Extrusion & Post PVA filmtransverse corrugationhaul-off vibrationcooling roller eccentricitypressure stabilizing device
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Q
Frequent screen clogging in PVA extrusion
A
Screen clogging is caused by impurities and improper configuration; raw material control and stepped screens are the key
Extrusion & Post PVA extrusionscreen clogginggel particlestepped screenautomatic screen change
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Q
Silver streaks caused by moisture during PVA processing
A
Silver streaks are caused by moisture vaporization and stretching; drying and venting are the main countermeasures
Material Drying PVA injectionsilver streakmoisture dryingventingback pressure
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Q
PVA injection cold slug marks
A
Cold slug marks are caused by solidified residual material in the nozzle; raising nozzle temperature and cold slug well design are the key
Injection Molding PVA injectioncold slug marknozzle temperaturecold slug wellinjection pressure
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Q
PVA extruded film wrinkling during winding
A
Film wrinkling is caused by tension fluctuation and uneven thickness; automatic tension control and homogenization are the key
Extrusion & Post PVA filmwinding wrinkletension controlthickness uniformityguide roller parallelism
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Q
PVA '2079851475616104452 flow marks
Q
PVA '2079851475616104452 sink marks
Q
PVA performance decay after repeated processing
A
Performance decay after multiple processing is caused by thermo-mechanical degradation; limiting regrind and supplementing antioxidant are the key
Production & Quality PVA recyclingperformance decayantioxidant supplementationthermal degradationshear degradation
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Q
Unbalanced multi-cavity filling in PVA '2079851475616104452
A
Unbalanced multi-cavity filling is caused by runner design; balanced runner and mold flow analysis are the key
Injection Molding PVA injectionmulti-cavity balancerunner designgate sizemold flow analysis
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Q
Ejector whitening of PVA injection molded products
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