Method for producing a thermoplastically deformable, fibre-reinforced semi-finished product

摘要

Continuous production of a thermoplastically deformable semifinished product comprises 10-80 wt.% thermoplastic resin and 20-90 wt.% reinforcing fibers comprises mixing thermoplastic fibers and reinforcing fibers to form a nonwoven web, strengthening the web by needling or heat bonding, heating the web to a temperature above the softening point of the resin, and passing the web sequentially through heated and cooled pressing tools in which the web is subjected to a pressure of less than 0.8 bar for at least 3 seconds. An independent claim is also included for a thermoplastically deformable semifinished product comprising 25-55 wt.% thermoplastic resin and 45-75 wt.% of reinforcing fibers with a weight-average length of 25-50 mm, in which air bubbles are uniformly distributed in an amount of 35-65 vol.%, where the reinforcing fibers are needled together and more than 80% of them are present as individual filaments.