문제 및 해결책

일반적인 플라스틱 재료 문제에 대한 실질적인 답변

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EVA internal shrinkage voids

Molds & Tooling EVA shrinkage void thick wall holding time gate freezing

EVA foam locally unfoamed

Molding Process EVA foam local unfoamed blowing agent dispersion mold temperature control uniform crosslinking

EVA creep deformation is large

Material Analysis EVA creep slight crosslinking high molecular weight rigid filler

EVA foam elastic recovery is poor

Molding Process EVA foam elastic recovery crosslinking degree foam density VA content

EVA processing temperature fluctuates

Material Analysis EVA temperature fluctuation PID calibration heater band thermocouple

EVA tensile strength is insufficient

Material Analysis EVA tensile strength molecular weight coupling agent orientation control

EVA dimensions change greatly with temperature

Extrusion & Post EVA dimensional temperature sensitivity thermal expansion coefficient rigid filler annealing treatment

EVA hardness is too high

Material Analysis EVA high hardness crystallinity filler amount plasticizer

EVA surface tiger-skin pattern

Injection Molding EVA tiger-skin pattern injection speed multi-stage injection mold temperature control

EVA foam becomes hard due to excessive crosslinking

Excessive crosslinking is caused by too much DCP; moderate crosslinking is key

Molding Process EVA foam excessive crosslinking DCP dosage crosslinking time hardness control

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