초록 ▼

A multilayer film, which is particularly suited to packaging of cheese on a Hayssen짰 RT packaging machine, has a first layer comprising cyclic olefin copolymer having a glass transition temperature of at least 125째 C., and a second layer comprising at least one member selected from the group consist

A multilayer film, which is particularly suited to packaging of cheese on a Hayssen짰 RT packaging machine, has a first layer comprising cyclic olefin copolymer having a glass transition temperature of at least 125째 C., and a second layer comprising at least one member selected from the group consisting of cyclic olefin copolymer having a glass transition temperature of at least 125째 C., polyamide, polyester, and polystyrene. The first and second layers are on opposite sides of a tensile axis of symmetry of the film. The film exhibits from 0 to 45 degrees of transverse edge curl, a yield point of at least 1200 psi at a temperature of 85째 C., and an elongation at break of from 0 to 300 percent at 85째 C. In addition, a packaging process comprises supplying the film and placing a plurality of product units on the flat film at desired intervals, forwarding the flat film having product units thereon, while forming a tubing from the flat film so that product is inside the tubing, followed by sealing the film along its length and transversely (upstream and downstream of the product), so that the product is a discrete packaged product is formed.

대표청구항 ▼

What is claimed is: 1. A packaging process comprising the steps of: (A) supplying an elongate multilayer film comprising: (i) a first layer comprising cyclic olefin copolymer having a glass transition temperature of at least 125째 C.; (ii) a second layer comprising at least one member selected from

What is claimed is: 1. A packaging process comprising the steps of: (A) supplying an elongate multilayer film comprising: (i) a first layer comprising cyclic olefin copolymer having a glass transition temperature of at least 125째 C.; (ii) a second layer comprising at least one member selected from the group consisting of cyclic olefin copolymer having a glass transition temperature of at least 125째 C., polyamide, polyester, and polystyrene; wherein the first and second layers are on opposite sides of a tensile axis of symmetry of the multilayer film, with the film exhibiting from 0 to 45 degrees of transverse edge curl, a yield point of at least 1200 psi at a temperature of 85째 C., and an elongation at break of from 0 to 300 percent at 85째 C.; (B) placing a plurality of product units on the film at desired intervals; (C) forwarding the film having product units thereon, while: (D) forming a tubing from the film so that product is inside the tubing upon reconfiguring the film to a tubing around the product, with longitudinal edge portions of the film being adjacent one another once the film has been reconfigured; (E) forming a longitudinal seal along a segment of the adjacent edge portions of the film, to form a sealed tubing segment, with a single product unit being inside of the sealed tubing segment; (F) forming a first transverse seal across the sealed tubing segment at a first location which is downstream of the single product unit; (G) severing the film downstream of the first transverse seal, and (H) forming a second transverse seal across the sealed tubing segment at a second location which is upstream of the single product unit; and (I) severing the sealed tubing segment from the multilayer film upstream of the second transverse seal, whereby a discrete packaged product is formed with the single product unit surrounded by the multilayer film; and wherein the forwarding of the film having the product units thereon is carried out by pulling on the film tubing with a means for making the first transverse seal and thereafter with a means for making the second transverse seal, while both the means for making the first transverse seal and the means for making the second transverse seal are at a temperature high enough to seal an inside layer of the film to itself. 2. The process according to claim 1, wherein the means for making the first transverse seal comprises a seal bar having a temperature of from 70째 C. to 150째 C., and the means for making the second transverse seal comprises a seal bar having a temperature of from 70째 C. to 150째 C. 3. The process according to claim 1, wherein the film having the product units thereon is forwarded horizontally. 4. The process according to claim 3, wherein each of the product units comprises cheese. 5. The process according to claim 4, wherein each product unit is an individual cheese block. 6. The process according to claim 4, wherein each product unit is a set of stacked slices of cheese. 7. The process according to claim 4, wherein each product unit is a set of shingled slices of cheese. 8. The process according to claim 1, wherein the multilayer film exhibits a yield point of at least 1200 psi at a temperature of 100째 C., and an elongation at break of up to 200 percent at 100째 C. 9. The process according to claim 8, wherein the film exhibits a exhibits a yield point of at least 1200 psi at a temperature of 120째 C., and an elongation at break of up to 300 percent at 120째 C. 10. The process according to claim 9, wherein the film exhibits a exhibits a yield point of at least 1200 psi at a temperature of 130째 C., and an elongation at break of up to 300 percent at 130째 C. 11. The process according to claim 10, wherein the film exhibits a exhibits a yield point of at least 1200 psi at a temperature of 140째 C., and an elongation at break of up to 300 percent at 140째 C. 12. The process according to claim 11, wherein the film exhibits a exhibits a yield point of at least 1200 psi at a temperature of 150째 C., and an elongation at break of up to 300 percent at 150째 C. 13. The process according to claim 12, wherein the film exhibits a complex modulus of from 30,000 to 500,000 psi throughout a temperature range of from 100째 C. to 150째 C. 14. The process according to claim 1, wherein the film has a thickness of from 0.5 mil to 10 mils. 15. The process according to claim 1, wherein the film further comprises a seal layer which comprises at least one member selected from the group consisting of homogeneous ethylene/alpha-olefin copolymer, very low density polyethylene, ionomer, ethylene/unsaturated ester copolymer, and ethylene/unsaturated acid copolymer. 16. The process according to claim 1, wherein the film further comprises an O2-barrier layer comprising at least one member selected from the group consisting of polyvinylidene chloride, hydrolyzed ethylene vinyl acetate copolymer , polyamide, polyalkylene carbonate, polyacrylonitrile. 17. The process according to claim 1, wherein the film further comprises a tie layer which comprises at least one member selected from the group consisting of modified ethylene/alpha-olefin copolymer, modified ethylene/unsaturated ester copolymer, modified ethylene/unsaturated acid copolymer, and polyurethane. 18. The process according to claim 1, wherein the film comprises a crosslinked polymer network. 19. The process according to claim 1, wherein the film has a total free shrink of less than 10 percent at 185째 F. 20. The process according to claim 1, wherein the film is a flat film.