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Injection Molding Guide - LyondellBasell

A Guide toPolyolefin Injection Molding1A Guide to Polyolefin Injection MoldingTable of ContentsIntroduction .. 2 Polyolefins are derived from petrochemicals .. 2 Molecular structure and composition affect properties and processability .. 2 Chain branching .. 3 density .. 3 Molecular weight .. 4 Molecular weight distribution .. 4 Copolymers .. 5 Modifiers and additives .. 5 Working closely with molders .. 5 How polyolefins are made .. 5 Low density polyethylene (LDPE) .. 6 High density polyethylene (HDPE) .. 6 Linear low density polyethylene (LLDPE) .. 7 Polypropylene .. 7 Shipping and handling polyolefin resins .. 7 Material handling .. 7 How to solve material handling problems .. 9 Other material handling practices.

For polyethylene, the density and crystallinity are directly related, the higher the degree of crystallinity, the higher the resin density. Higher density, in turn, influences numerous properties. As density increases, heat softening point, resistance to gas and moisture vapor permeation and stiffness increase. However, increased density ...

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