Material having a passage therethrough

Details Material having a passage therethrough Material having a passage therethrough

B - Operations, Transporting

65

D

B65D 81/24 (2006.01) B65D 5/42 (2006.01) B65D 33/01 (2006.01)

Patent

CA 2106881

2106881 9216434 PCTABS00016 A bilayer laminated material has a gas permeability increasing greatly with temperature, achieved by cutting a star-shaped hole in it when it is relaxed and flat. On warming, the leaves between the radial cuts curl and disproportionately increase the hole size. Such a material, if flat at 5 ·C and wide open at 20 ·C, is useful for packaging vegetable produce.

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