| 摘要 |
A multi-layered bag including synthetic plastics material has attached to opposed walls the interengageable male and female elements 18, 16 respectively of a strip fastener. The bags may be produced in strip form with each bag joined to the adjacent bags by means of welds extending transversely of the strip. Each transverse weld is associated with a transverse line of perforations or weakness whereby the bags can readily be separated from one another. Production of the material for the multi-layered bags can be by way of co-extrusion of the materials or by lamination. According to one described method, two sheets of suitable material, preferably in the form of elongate webs, 26, 28 are laminated one to the other. In another form, a tube of material is externally sheathed thereby to provide the laminate. The tube in this latter form, or one of the sheets in the first form, carry the male and female parts of the snap-engaging releasable connection. After production of the laminated material, welding and perforating operations are performed to produce the strip of bags. <IMAGE> |
