Method for manufacturing gas permeable packaging material

Details Method for manufacturing gas permeable packaging material Method for manufacturing gas permeable packaging material

B - Operations, Transporting

32

B

154/71

B32B 27/10 (2006.01) B65D 75/26 (2006.01)

Patent

CA 1245964

- 21 - Abstract of the Disclosure A method of manufacturing a gas permeable packag- ing material, which comprises the steps of forming a laminate composed of an outer plastic film and a gas permeable inner sheet with a first heat-sealable layer interposed therebetween, perforating the laminate with a number of micro-pores, which extend from the outer film side to at least the inner sheet, heat-sealing a second heat-sealable film with or without a number of small-pores to the inner sheet, and, if the second heat-sealable film is of no porous, forming a number of small-pores in the second heat-sealable film, a pore ratio of the second heat-sealable film being greater than that of the outer film.

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