Patent ID: 11859060
Assignee: GARWARE HI-TECH FILMS LIMITED
Field: Other special machines (Mechanical engineering)
Classification: CPC C  B | IPC B  C

Claim 0:
1. A process for dyeing of a hydrolysis resistant polyester film, said process comprising the following steps:
a. dyeing a hydrolysis resistant polyester film in a dye bath comprising at least one coloring agent (dye), at least one polyhydric alcohol and optionally at least one UV stabilizer, at a temperature in the range of 140° C. to 190° C. to obtain a dyed film;
b. quenching said dyed film in a first fluid medium to obtain a quenched film;
c. cleaning said quenched film with a second fluid medium followed by scrubbing and rinsing to obtain a cleaned film; and
d. drying said cleaned film in an oven at a temperature in the range of 50° C. to 250° C. to obtain the dyed hydrolysis resistant polyester film.