Patent ID: 11965069
Assignee: FAR EASTERN NEW CENTURY CORPORATION
Field: Other special machines (Mechanical engineering)
Classification: CPC C | IPC C

Claim 10:
11. A method for manufacturing the heat-shrinkable polyester film according to claim 1, comprising the steps of:
a) providing the polyester-forming resin composition including the recycled material;
b) heating the polyester-forming resin composition in nitrogen atmosphere to permit the polyester-forming resin composition to undergo esterification reaction so as to obtain an esterified product;
c) subjecting the esterified product to heating and polymerization reaction in vacuum and in the presence of a catalyst and a heat stabilizer until the esterified product reaches an intrinsic viscosity ranging from 0.5 dL/g to 0.8 dL/g so as to obtain a polyester product;
d) subjecting the polyester product to granulation so as to obtain a plurality of polyester chips;
e) subjecting the polyester chips to heating and extruding so as to obtain a sheet; and
f) subjecting the sheet to a film formation process so as to obtain the heat-shrinkable polyester film.