Similarities between HDPE and LDPE in performance:
1) low water absorption, may not be dried before molding.
2) polyethylene shear sensitive materials that affect the viscosity shear rate is more obvious.
3) large and clear direction shrinkage, warpage products easily.
4) Mount on polyethylene is a crystalline polymer. It directly affects the degree of crystallinity uniform product density distribution so.
Requirements of the mold cooling water are arranged as uniformly as possible, so that uniform density to ensure the accuracy of product size and shape.
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