Why accurate moisture measurement is essential for the quality of polyethylene terephthalate (PET)

Polyethylene terephthalate (PET)

Polyester polymer chips such as polyethylene terephthalate (PET) are hygroscopic, meaning that they absorb moisture from their surrounding atmosphere. Too much moisture in the chips causes issues during the injection moulding and extrusion processes. As the plastic is heated, the water contained within it hydrolyses the PET, which decreases both its strength and aesthetic qualities.

This means that before PET can be processed in a molding machine, as much moisture as possible must be removed from the resin. In atmospheric conditions, the resin can contain as much as 0.6% water by weight.

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