| 摘要 |
1436126 Seaming non-metallic sheet material CANADIAN INDUSTRIES Ltd 16 Aug 1973 [19 Sept 1972] 43284/72 Heading B5K [Also in Division B8] A plastics bag of at least two plies, which may be high-density polyethylene and low-density polyethylene, has an overlapped portion secured by two seals 5 and 6, the seal 5 including four thicknesses of material in the case of a two-ply bag and the seal 6 including three plies. |
