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Problema y solución

Respuestas prácticas a los desafíos comunes de los materiales plásticos

11636 preguntas
Q
Silver Streaks Caused by Moisture in EVOH Processing
A
Silver streaks are caused by moisture vaporization and stretching; drying and venting are the main countermeasures
Material Drying EVOH injectionsilver streakmoisture dryingventingback pressure
Q
EVOH '2079851475616104452 Cold Slug Marks
A
Cold slug marks are caused by solidified residual material in the nozzle; increasing nozzle temperature and cold slug well design are key
Injection Molding EVOH injectioncold slug marknozzle temperaturecold slug wellinjection pressure
Q
EVOH Extruded Film Winding Wrinkles
A
Film wrinkling is caused by tension fluctuation and uneven thickness; automatic tension control and homogenization are key
Extrusion & Post EVOH filmwinding wrinkletension controlthickness uniformityguide roller parallelism
Q
EVOH '2079851475616104452 Flow Marks
A
Flow marks are caused by unstable injection front and rapid cooling; multi-stage injection and high mold temperature are key
Injection Molding EVOH injectionflow markinjection speedmold temperaturegate area
Q
EVOH '2079851475616104452 Sink Marks
A
Q
EVOH Performance Degradation After Repeated Processing
A
Performance degradation from multiple processing is caused by thermo-mechanical degradation; limiting regrind and supplementing antioxidant is key
Production & Quality EVOH recyclingperformance degradationantioxidant supplementationthermal degradationshear degradation
Q
EVOH injection multi-cavity filling imbalance
A
Multi-cavity filling imbalance is caused by runner design; balanced runners and mold flow analysis are key
Injection Molding EVOH injection multi-cavity balance runner design gate size mold flow analysis
Q
EVOH injection molded product ejector whitening
A
Q
EVOH heat-sensitive degradation and discoloration
A
EVOH heat-sensitive decomposition is caused by vinyl alcohol dealcoholization; temperature control is the fundamental countermeasure
Material Analysis EVOH thermal decomposition dealcoholization yellowing heat stabilizer temperature control
Q
EVOH extrusion feeding is unstable
A
Unstable feeding is caused by pellet characteristics; loss-in-weight feeding and anti-bridging are core
Extrusion & Post EVOH feeding bridging loss-in-weight feeder pelletizing feeding screw
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