| 摘要 |
<p>A composite with a thermoplastic matrix and fiber reinforcement (12) is made by rotation of an exit die (22) about a roving of continuous fiber (12) in the presence of a thermoplastic melt. The rotation causes opposing inner and outer helical flow conditions which reduce the melt viscosity of the polymer by shear thinning while dragging and directing the polymer into the fiber roving thereby wetting and dispersing the fiber. A composite structure is formed with a polymer rich skin (41) and a core region (42) of unidirectionally aligned polymer and fiber (12). The polymeric skin (41) is composed of helically aligned polymer chains which are coiled by the rotation around the core to compress the core region (42) and enhance fiber wet out.</p> |
