Concepts for careful processing of returnable PET bottles
The design of bottling lines fixes the mechanical factors which determine bottle appearance. Furthermore, cleaning agents, disinfectants and belt lubricants also have a decisive influence on appearance.
Returnable PET bottles have advantages e.g. they are accepted by customers, they are lighter etc., but special attention must be paid to the chemical structure of the packaging material.
Polyethylene terephthalate (PET) belongs to the polyester group and is attacked during cleaning in caustic solution baths. This corrosion problem which manifests itself in the form of stress corrosion ("stress cracking") and greying of bottles ("hazing") is largely influenced by the caustic additives used.
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