Abstract: The present invention relates to a multi-layer laminate comprising at least two layers of an oriented ultra-high molecular polyolefin layer and a thermoplastic resin layer. The multi-layer laminate exhibits excellent abrasion resistance, tensile strength, shock resistance, heat-sealing property, uniformity in the film thickness, and can be efficiently produced. The invention is further concerned with a process and an apparatus for producing the multi-layer laminate.

Abstract: A method of producing an inflation film which includes the steps of melting an ultra-high-molecular-weight polyolefin in an extruder, extruding the molten polyolefin from a screw die, and blowing a gas into a molten tubular film formed by extrusion. An apparatus for producing an inflation film which includes an extruder provided with a first screw, and a screw die having an L/D of at least 5 and is provided at the end of the extruder, wherein the screw die includes a second screw which rotates independently of the first screw, a mandrel coupled to the end of the second screw and rotates together with the second screw, an outer tube die in which the mandrel is inserted, and a gas passage extending in the second screw and in the mandrel. An inflation film is composed of an ultra-high-molecular-weight polyolefin having a tensile strength at break of greater than 1660 kg/cm.sup.2 in a machine direction and greater than 1600 kg/cm.sup.2 in a transverse direction, an impact strength of greater than 9500 kg.

Abstract: A neck-in control device of a flat die comprising a pair of inducing guides, provided at both ends of a resin extruding outlet of the flat die, for inducing a molten resin extruded from the resin extruding outlet to move outward, whereby an inward neck-in of the molten resin is suppressed.