Methods for manufacture of a polyolefin article

摘要

Methods for the manufacture of a polyolefin article are provided which exhibit excellent levels of mechanical strength and dimensional stability to temperature while not incorporating a dissimilar reinforcing material, such as a glass fiber, and which can be readily manufactured. A method for manufacture of a polyolefin article characterized as including the steps of:
covering an oriented polyolefin material having a value of not excovering 5 x 10 -5 (/°C) for average coefficient of linear expansion in the 20 - 80 °C range with a layer of polyolefin having a melting point lower than that of said oriented polyolefin material;
subsequent to the covering with the polyolefin layer, effecting joining of the oriented polyolefin material by the application of pressure and heat at a temperature below the melting point of the oriented polyolefin material but sufficient to soften or melt said covering polyolefin.