Method for recycling polyester
AssigneePhp Fibers GmbH
InventorsChristian Vieth, Andreas Flachenecker, Lukas Lacho, Enrique Herrero Acero
Life of this patent
Estimating the term…
Abstract
A method for producing filaments from polyester waste, having the steps of mechanically comminuting the polyester waste, post-condensing the comminuted polyester waste in the solid phase, melting the post-condensed polyester waste and extruding the melt in order to form filaments. Prior to carrying out the melting step for extrusion purposes, the method is completely carried out below the melting temperature of the polyester waste. The solution viscosity of the post-condensed polyester waste equals at least 1.7. Possible applications of the filaments according to the invention are, for example, reinforcement carcasses for vehicle tyres.
Claims15
Method for producing filaments from polyester waste, having the steps of
- a. mechanically comminuting the polyester waste,
- b. post-condensing the comminuted polyester waste in the solid phase,
- c. melting the post-condensed polyester waste,
- d. extruding the melt in order to form filaments,
- wherein
- prior to the melting step (c), the method is caried out entirely below the melting temperature of the polyester waste, and
- the solution viscosity of the post-condensed polyester waste equals at least 1.7 according to DIN EN ISO 1628-1:2012-10.
Dependencies are inferred from the claim text.