MEANS FOR CONTINUOUS ORIENTATION AND TRANSFER OF A CONTINUOUS SCREEN OF THERMOPLASTIC MATERIAL, MEANS FOR THE FORMATION OF INTERFACE OF A CONTINUOUS SCREEN, MEANS FOR THE CONTINUOUS MANUFACTURE OF MOLDED THERMOPLASTIC ITEMS, THE PROCESSING OF ORIENTED PRODUCTS ORIENTED PRODUCTS MANUFACTURE OF MOLDED THERMOPLASTIC ITEMS AND QUICK AND CONTINUOUS ORIENTATION PROCESS OF AN EXTRUDED SCREEN

摘要

A means for interfacing a web of continuously formed thermoplastic material with a continuously undulating and rotating peripheral surface of a mold (22) having multiple cavities therein, comprises elongated bracket means (120D) extending longitudinally of said web and pivotally mounted on a transverse axis at its upstream end for rotation toward and away from said peripheral surface, a plurality of parallel roller means (120) through which said web is threaded in a serpentine manner, downstream roller means (120C) to follow said peripheral surface, and upstream roller means (120D) having an axis of rotation substantially coincident with the said transverse pivotal axis of said bracket means (120D). By the said means the inertia at the interface between the rotating polygonal mold (22) and a biaxial orientation apparatus (16, 18) is reduced to an optimal minimum to minimize resulting longitudinal stresses in said web.