Problem & Solution

Practical answers to common plastic material challenges

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Mold temperature differences in different areas affect product quality

Mold temperature gradient needs to be set according to area and material characteristics

Molds & Tooling mold temperature gradientregional temperature differencecrystallizationPA

Yellow-brown or black specks appear locally on the product

Burnt is caused by overheating degradation or poor venting

Molds & Tooling burntcarbonizationthermal degradationventing

Obvious depressions at thick-wall areas of the product (rib roots, back of bosses)

Molds & Tooling sink markholding pressuregatemold temperature

PVA product elliptical deformation

Molds & Tooling PVAelliptical deformationsymmetric ejectionuniform coolingsetting time

PVA product twist deformation

Twist deformation is caused by asymmetric cooling; symmetric cooling is the key

Molds & Tooling PVAtwist deformationsymmetric coolinggate arrangementannealing

Insufficient PVA flatness

Molds & Tooling PVAflatnessshrinkage differenceuniform mold temperatureannealing treatment

PVA internal shrinkage voids

Molds & Tooling PVAshrinkage voidthick wallholding timegate freezing

Poor PVA fatigue resistance

Molds & Tooling PVAfatigue resistancecrosslinking degreemolecular weightstress concentration

PVA angle deviation

Molds & Tooling PVAangle deviationshrinkage compensationmold designfull cooling

PVA length out of tolerance

Molds & Tooling PVAlength out of toleranceshrinkage ratemold compensationfull cooling

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