Problem & Solution

Practical answers to common plastic material challenges

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Severe Internal Stress Concentration in EVOH

Injection Molding EVOHinternal stressorientation stressannealinguniform cooling

Dense EVOH Surface Pits

Extrusion & Post EVOHsurface pitimpurity particlemold repairraw material purity

Material Overflow at EVOH Vacuum Vent

Overflow is caused by low melt viscosity; cooling and adding baffle are key

Extrusion & Post EVOHvacuum vent overflowmelt viscositycoolingvent baffle

EVOH Length Out of Tolerance

Molds & Tooling EVOHlength out of toleranceshrinkagemold compensationfull cooling

EVOH Stress Cracking

Production & Quality EVOHstress crackingenvironmental stressannealinghigh molecular weight

EVOH Material Changeover Residue

Processing Machinery EVOHchangeover residuepurging compoundscrew disassemblydead zone cleaning

EVOH Surface Microcracks

Production & Quality EVOHmicrocrackinternal stressannealingstress concentration design

Poor EVOH Surface Gloss

Molds & Tooling EVOHglossmold polishingcrystalline scatteringnucleating agent

Fast UV Aging of EVOH

Fast UV aging is caused by photo-oxidation; UV absorber and HALS are key

Material Analysis EVOHUV agingUV absorberHALSradical scavenging

Unstable EVOH Shrinkage

Material Analysis EVOHshrinkagebatch differencetemperature control stabilitycrystallization consistency

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