| 发明名称 |
MATERIAL HAVING A PASSAGE THERETHROUGH |
| 摘要 |
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. |
| 申请公布号 |
CA2106881(A1) |
申请公布日期 |
1992.09.26 |
| 申请号 |
CA19922106881 |
申请日期 |
1992.03.24 |
| 申请人 |
BRITISH TECHNOLOGY GROUP LTD. |
发明人 |
CHALLIS, ANTHONY A. L.;BEVIS, MICHAEL J. |
| 分类号 |
B32B7/02;A61F13/02;B32B27/00;B32B27/08;B32B27/36;B65D5/42;B65D33/01;B65D65/40;B65D81/24;B65D81/26;B65D81/34;(IPC1-7):B65D81/24 |
主分类号 |
B32B7/02 |
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