Method for recycling trays and blisters
AssigneeAlpla Werke Alwin Lehner GmbH & Co. KG
InventorMichael Heyde
Life of this patent
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Abstract
Method for recycling trays and blisters made of PET, which are referred to as articles, comprising the following method steps: (a) pre-sorting the articles, (b) comminuting the articles to form flakes, (c) washing the articles in a first washing step, (d) dewatering the flakes, (e) drying the flakes, (f) sorting the flakes, (g) extrusion, and (h) solid-state polycondensation (SSP). The first washing step (c) is a gentle washing step with reduced particle friction and a low temperature below 62° C. During the sorting of the flakes (f), the flakes, which have been gently washed in the first washing step (c), are sorted.
Claims15
Method for recycling PET articles in the form of trays and blisters, comprising the following method steps:
- pre-sorting PET articles,
- comminuting the sorted PET articles to form PET flakes,
- gently washing the PET flakes in a first washing step performed with reduced particle friction between PET flakes to limit breakage of the PET flakes and performed at a temperature below 62° C. in a basic medium or performed at a temperature below 85° C. in an acidic medium,
- dewatering the PET flakes,
- drying the PET flakes,
- sorting PET flakes that have been gently washed,
- performing solid-state polycondensation on the sorted PET flakes, and
- extruding the PET flakes.
Dependencies are inferred from the claim text.