Importance

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Abstract

A high-strength laminate comprising generally weakly adhered biaxially oriented films, each formed of a blend which exhibits a distinct fibrous morphology with the fibres forming a distinct unidirectional grain when measured in a micro-scale but with the fibre-portions strongly deflected from this direction as seen on a micro-scale, the films being arranged in the laminate such that the undirectional grain in at least two of the films criss-cross each other. This laminate is produced by melt attenuating the blend(s) while extruding the latter into film-like layers, cross-laminating at least two layers before or after solidification while they are still in molecularly unoriented state--except for the weak orientation produced by the melt-attenuation--and finally strongly biaxially orienting the laminate by stretching in several steps, whereby the stretching is generally uniaxial during each step.

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First Claim