Patent ID: 8021592
Filing Date: 2011-09-20
Classification: B29C,B29K,Y10T

Abstract:
1. A process for production of a monolithic article from an assembly of two or more webs of fibres of oriented polypropylene homopolymer or copolymer having a melting temperature and a recrystallisation temperature and having a weight average molecular weight of less than or equal to 250,000, comprising the steps of: subjecting the assembly to elevated temperature and pressure sufficient to melt a proportion of the polymer and compact it; and actively cooling the compacted assembly at an elevated pressure to a predetermined amount below the recrystallisation temperature, wherein an accelerated rate of cooling is employed down to the predetermined amount below the recrystallisation temperature of the fibres at an accelerated cooling rate of at least 35° C. per minute, such as to produce a monolithic article with improved ductility and improved peel strength.