Patent ID: 8992711
Filing Date: 2015-03-31
Classification: B29C,B29D,B29K,B29L

Abstract:
1. A method of making a composite tube, comprising: spinning a mandrel having an interior wall; gripping a leading edge of each short-reinforcing fiber among short-reinforcing fibers and pulling the short reinforcing fiber through a nozzle with a set of rollers in the nozzle, via the set of rollers being spaced apart from each other by a distance less than a diameter of the short-reinforcing fibers and a spring applying a force on at least one roller of the set of rollers delivering the short reinforcing fibers, via the nozzle, onto the interior wall of the mandrel while spinning the mandrel; self-aligning the short reinforcing fibers due to an orientation of the nozzle relative to the mandrel while spinning the mandrel, such that a length of each fiber aligns with a circumference of the composite tube and with a length of each other short reinforcing fiber on the interior wall; and spraying the short reinforcing fibers with resin as the short reinforcing fibers are applied onto the interior wall.