The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 26, 2019
Filed:
Oct. 04, 2017
Far Eastern New Century Corporation, Taipei, TW;
Ching-Chun Tsai, Taipei, TW;
Tsung-Hung Liu, Taipei, TW;
Tsan-Chin Chang, Taipei, TW;
Chi-Feng Lin, Taipei, TW;
Jie Shiu, Taipei, TW;
Chien-Wei Wang, Taipei, TW;
Chin-Tien Chen, Taipei, TW;
Far Eastern New Century Corporation, Taipei, TW;
Abstract
A continuous process for preparing a polyester shrinkable film includes: pumping an amorphous PET-based polyester melt having a melt viscosity η1 directly from a polymerization reactor into a first cooling zone; cooling the polyester melt to increase the melt viscosity thereof to a melt viscosity η2 such that a difference between η2 and η1 ranges from 1500 poise to 3500 poise; feeding the polyester melt into a second cooling zone; cooling the polyester melt to increase the melt viscosity thereof to a melt viscosity η3 ranging from 5000 poise to 12000 poise such that a difference between η3 and η2 ranges from 1000 poise to 5500 poise; and pumping the polyester melt from the second cooling zone into a zone for film-forming treatment.