| 摘要 |
A flexible laminate of films of thermoplastic polymer material comprises fluted ply A and substantially flat ply B, adhered to one another at the crests of A in contact with B. The wavelength of the flutes is preferably no more than 3mm. The thickness of A is generally the same within the non-bonded zones as it is within the bonded zones or A has attenuated zones extending parallel to the flute direction, each bonding zone being mainly located within a first attenuated zone. Apparatus for forming the laminate comprises aligned grooved fluting rollers and grooved laminating roller. The laminate has useful mechanical characteristics, as a flexible material, e. g. when formed into bags which may be self-supporting. Filler material may be filled into the flutes and/or perforations may be provided in one or both plies after lamination. |
