White, heat shrink film and a process of its manufacturing
AssigneeGarware Hi-Tech Films Limited
InventorsMonika Shashikant GARWARE, SARITA GARWARE RAMSAY, SONJA SHASHIKANT GARWARE
Life of this patent
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Abstract
The present disclosure relates to a white, heat shrink film and a process for its manufacturing. The white, heat shrink film is a product of a co-polyester, a dye, an optical brightener, an antioxidant, at least one whitening additive and at least one pinning additive. The white, heat shrink film of the present disclosure is cost-effective, protects the photosensitive contents/material inside the container, enhances shelf life of the contents/material inside the container and blocks UV light. The process of the present disclosure is simple, economic and eliminates printing step of white ink printing and thereby eliminates the solvent pollution.
Claims24
A white, heat shrink film being a product of:
- a. 80 mass % to 95 mass % of a co-polyester;
- b. 0.0001 mass % to 0.0005 mass % of a dye;
- c. 0.03 mass % to 0.09 mass % of an optical brightener;
- d. 0.1 mass % to 0.3 mass % of an antioxidant;
- e. 4 mass % to 10 mass % of at least one whitening additive;
- and
- f. 0.01 mass % to 0.07 mass % of at least one pinning additive,
- wherein said co-polyester is a reaction product of a dicarboxylic acid, at least three diols, a polymerization catalyst, inorganic particles and a thermal stabilizer, and
- wherein said mass % of each ingredient is with respect to the total mass of said white, heat shrink film.
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A process for manufacturing a white, heat shrink film, said process comprising the following steps:
- a. esterifying predetermined amounts of a dicarboxylic acid and at least three diols at a first predetermined temperature for a first predetermined time period at a first predetermined pressure in an inert atmosphere to obtain an esterified monomer;
- b. pre-polymerizing said esterified monomer at a second predetermined temperature for a second predetermined time period at a second predetermined pressure by using predetermined amounts of inorganic particles, a polymerization catalyst and a thermal stabilizer to obtain a pre-polymer;
- c. polymerizing said pre-polymer in an autoclave at a third predetermined temperature for a third predetermined time period at a third predetermined pressure to obtain a co-polyester;
- d. granulating said co-polyester by using an underwater granulator to obtain co-polyester granules having a predetermined size;
- e. mixing said co-polyester granules with predetermined amounts of an antioxidant, an optical brightener, a dye, a pinning additive, a whitening additive to obtain a mixture;
- f. drying said mixture at a fourth predetermined temperature for a fourth predetermined time period to obtain a dried mixture;
- g. extruding said dried mixture by using extruder at a fifth predetermined temperature for a fifth predetermined time period to obtain a polymer melt;
- h. quenching said polymer melt at a sixth predetermined temperature for a sixth predetermined time period to obtain a cast film;
- i. preheating said cast film at a seventh predetermined temperature for a seventh predetermined time period to obtain a mono film;
- j. stretching said mono film in transverse direction at an eighth predetermined temperature for an eighth predetermined time period at a predetermined draw ratio to obtain a transverse oriented film;
- and
- k. winding said transverse oriented film on a winder roll at a temperature in the range of 20° C. to 40° C. to obtain said white, heat shrink film.
Dependencies are inferred from the claim text.