5. Implementation and applications
High-density polyethylene is a thermoplastic, and adopts the same processing techniques.
5.1 Injection
A distinction can be made between :
single injection ;
bimaterial injection molding, which produces parts with a skin that gives them their appearance and characteristics, and a core made from lightweight or recycled materials;
co-injection of gas into PE-HD, which has a number of advantages: lighter hollow parts, less shrinkage, better surface appearance, less distortion, lower internal stresses, reduced clamping force and shorter cooling time; but also disadvantages: impossible to use a multi-cavity mold, hole – to be plugged – in the part...
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Implementation and applications
Conclusion
Bibliography
Regulations
NF 388 mark – Plastic tanks used for unburied storage of domestic heating oil.
NF 114 mark – Polyethylene pipes for combustible gas distribution networks, drinking water distribution networks, irrigation and industrial applications, non-drinking water and pressurized wastewater systems.
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