| 摘要 |
A process for use in making bags from layered, coextruded film. The film can comprise a layer of HDPE (high density polyethylene) or PP (polypropylene) on a layer of EVA. Normally the HDPE layer cannot be heat sealed to the EVA layer. Both sides of the film are given a fairly high corona treatment. After treatment, a lap joint can be formed with the EVA layer abutting the HDPE layer, and the lap joint can then be heat-sealed together. The invention is also directed to a sleeve or bag made from layered, coextruded film. One outer layer of the film forming the bag is made from HDPE, the inside layer from one of EVA (ethylene vinyl acetate), EEA, EMA (ethylene maleic anhydride) or EAA. The bag has a heat-sealed lap joint with the inside surface layer overlapping the one outer surface. |
