Method of making a reinforcing mat for a pultruded part
AssigneePella Corporation
InventorsLaurence W. Davies, Peter J. Fritz, Kenneth D. Beer
Life of this patent
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Abstract
A method of preparing a reinforcing structure for use in manufacture a pultruded part where the reinforcing structure is pulled through a pultrusion die in a continuous longitudinal pull direction. The method includes arranging a plurality of first reinforcing fibers in a transverse direction and attaching a permeable transport web of staple fibers to the first reinforcing fibers such that the portion of the first reinforcing fibers oriented in the direction transverse comprises at least 30% of a volume of materials comprising the reinforcing structure.
Claims14
A mat for use as reinforcement for a resin composition to be used in forming an elongated, pultruded part of constant transverse cross-section using a pultrusion die, said mat comprising:
- a pull layer (30) of continuous, generally longitudinally-arranged pulling fibers (28) to provide strength to the mat longitudinally thereof in the pull direction of the mat during pultrusion of the part;
- a reinforcement layer (34) of angular mat fibers (32) in association with the pulling fiber layer (30) and oriented in a direction at an angle with respect to the longitudinal pull direction of the mat to provide stiffness to the mat during pultrusion of the part;
- lines of stitching (47) interconnecting the pull layer (30) and the reinforcement layer (34) to provide the mat;
- and
- relatively short entangling fibers (46a), at least a portion of which extend through the thickness of the mat layers and interconnect the fibers of the layers to increase the integrity of the mat during pultrusion of the part and curing of the resin composition.
Dependencies are inferred from the claim text.