LAMINATES OF FILMS HAVING IMPROVED RESISTANCE TO BENDING IN ALL DIRECTIONS AND METHODS AND APPARATUS FOR THEIR MANUFACTURE

摘要

The present invention relates to a flexible laminate of films of thermoplasticpolymer material mainly for applications in which relatively high yieldstrength and ultimate tensile strength is required, and a method and apparatusfor its manufacture. The laminate comprises a monofilm~ formed or multifilm-formed ply (A) and another monofilm-formed or multifilm~ formed ply (B) bothmainly consisting of orientable thermoplastic polymer material, in which A hasa fluted configuration and B on a first side is adhesively bonded in bondingzones to the crests on a first side of A, in which B also has a flutedconfiguration, the flute direction of B forming an angle from generally about30~ up to and including 90~ to the flute direction of A and the said bondingzones being on the crests of the first side of B to produce spot bonding withthe crests on the first side of A, the wavelengths of the flutes in A and/or Bare no longer than 5 mm, and the wavelengths of the flutes in both A and B areless than 10 mm.