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Practical answers to common plastic material challenges

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EVA internal stress concentration is severe

Injection Molding EVA internal stress orientation stress annealing treatment uniform cooling

EVA surface pockmarks are dense

Extrusion & Post EVA surface pockmarks impurity particles mold repair raw material purity

EVA surface microcracks

Production & Quality EVA microcracks internal stress annealing treatment stress concentration design

EVA surface gloss is poor

Molds & Tooling EVA gloss mold polishing crystalline scattering nucleating agent

EVA heat-sensitive decomposition and yellowing

Material Analysis EVA thermal decomposition deacetylation yellowing heat stabilizer temperature control

EVA purging is difficult

Processing Machinery EVA purging difficulty adhesion PE flushing dedicated purging compound

EVA material changeover residue

Processing Machinery EVA changeover residue purging compound screw disassembly dead zone cleaning

EVA shrinkage rate is unstable

Material Analysis EVA shrinkage rate batch difference temperature control stability crystallization consistency

EVA foam hardness is too high

Molding Process EVA foam high hardness foam density crosslinking degree VA content

EVA internal crystallization is coarse

Molding Process EVA coarse crystallization spherulite refinement nucleating agent cooling rate

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