Process for the solidification of tubes and other hollow bodies made of polyethylene or structurally and mechanically related plastics by stretching of this body

摘要

863,417. Treating polyolefin articles. FARBWERKE HOECHST A.G. Sept. 3, 1957 [Sept. 6, 1956], No. 27833/57. Drawings to Specification. Class 2(6). Strengthened hollow bodies of polyolefins are prepared by the expansion and subsequent cooling of heated hollow bodies, the expansion being carried out at a temperature between that. which just avoids a neck formation and the crystallite melting point. Specified polyolefins are polyethylene, polypropylene, ethylene-propylene copolymers, all preferably low-pressure polymers, and mixtures with one another or with polyvinyl chloride.