Importance

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Abstract

A method for producing fiber-reinforced plastic screw-like fastening element including a thread portion and a head having a cross section which is larger than that of the thread portion. The method includes preparing a rod material including an elongated matrix formed of a plastic material and a plurality of elongated parallel fiber elements embedded within the matrix material along the length of the matrix, with the fiber elements having melting points substantially higher than the softening point of the matrix. Thereafter the prepared rod material of the screw is placed into a mold chamber having an internal surface of a semi-circular cross section with the internal surface having a small diameter portion and a large cross section portion communicating concentrically to the small diameter portion. The rod material is then heated to a temperature equal to or greater than the softening point of the matrix material. The heated material is then pressed to form a half round bar from the material, and cooled to a temperature lower than the softening point of the matrix material; and finally, the cooled rod material is removed from the mold chamber.

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First Claim