Long-fiber reinforced thermoplastics are made by a pultrusion process that blends the fibers with the matrix resin. Due to the shorter long fibers at the end of the fiber, good filling properties, the long fiber mix interweaves, flirts, and bends in the mold The short fibers arranged along the water flow are mixed. Therefore, the long-fiber-blended shaped article has higher homogeneity than the short-fiber-blended molded article. And the high strength-to-weight ratio of long fiber-reinforced composites makes them an ideal replacement for metals or materials that perform poorly.
Process definition[ edit ] A polymer is generally manufactured by step-growth polymerization or addition polymerization. When combined with various agents to enhance or in any way alter the material properties of polymers, the result is referred to as a plastic. Composite plastics refers to those types of plastics that result from bonding two or more homogeneous materials with different material properties to derive a final product with certain desired material and mechanical properties. Fibre-reinforced plastics are a category of composite plastics that specifically use fibre materials to mechanically enhance the strength and elasticity of plastics. The original plastic material without fibre reinforcement is known as the matrix or binding agent. The matrix is a tough but relatively weak plastic that is reinforced by stronger stiffer reinforcing filaments or fibres. The extent that strength and elasticity are enhanced in a fibre-reinforced plastic depends on the mechanical properties of both the fibre and matrix, their volume relative to one another, and the fibre length and orientation within the matrix.