PROCESS FOR RECYCLING A METALIZED POLYESTER FILM

摘要

The present invention relates to a process for converting the waste or used metalized polyester (PET) film into recycled PET (RPET) as a starting raw material for various utility products. Particularly, the present invention provides a process for the manufacturing of high quality strapping or monofilament yarn or sheets from the recycled metalized PET film.

主权项

1. A process of converting waste or used metalized polyester (PET) film to obtain a recycled PET pellets suitable to produce PET Straps, monofilament yarn and PET Sheets comprising steps of:
(i) collecting waste/used metalized PET film; (ii) obtaining crushed film or flakes by reducing the size of waste or used metalized PET film either before or after washing by a grinder or granulator or by cutter-compactor; (iii) washing the film of step (i) and/or crushed film or flakes of step (ii) in hot water bath or in alkaline or in alkali solution having concentration in the range of 0.5 to 3% in water solution at room temperature to 90 ° C.; (iv) densifying the film or flakes of step (iii) in a agglomerator to increase the bulk density of the film or flakes; (v) feeding thus obtained film or flakes of step (iv) into an extruder for devolatilizing, homogenizing and converting the same into melt; (vi) conveying the melt of step (v) into a pelletizer to obtain recycled PET pellets having intrinsic viscosity less than 0.55 dl/g; (vii) increasing intrinsic viscosity of the pellets obtained in step (vi) from 0.55 dl/g up to 1.00 dl/g by solid state polymerization to obtain desired recycled PET pellets suitable for making high quality strapping or monofilament yarn or sheets.