Apparatus for longitudinally reinforcing continuously generated plastic pipe

An apparatus for longitudinally reinforcing plastic pipe as it is generated comprising means for coating a plurality of fiber elements with resin, means for winding the plurality of resin-coated fiber elements substantially circumferentially onto the surface of the pipe being generated such that a longitudinal nip is formed at the points of contact of the resin-coated fiber elements and the surface, and means for depositing continuous fiber elements substantially longitudinally into the longitudinal nip such that the continuous fiber element deposited into the nip are contacted by the resin-coated fiber elements and are pressed onto the surface of the pipe, said means for depositing comprising an oscillating source moving substantially parallel to the longitudinal axis of the pipe for laying the continuous fiber elements onto the surface in a sinuous pattern, another oscillating source moving substantially parallel to the longitudinal axis of the pipe for supplying continuous fiber elements to the nip, and means for moving said first-mentioned oscillating source and said other oscillating source in opposite directions.

An apparatus for longitudinally reinforcing plastic pipe as it is generated, the pipe being rotated about a longitudinal axis, comprising roller means contacting the surface of the rotating pipe, the roller means and the surface forming a longitudinal nip, means for depositing continuous fiber elements substantially longitudinally into the longitudinal nip and for forming the continuous fiber elements into a sinuous pattern on said surface having successive longitudinal portions that extend substantially parallel to the longitudinal axis of the pipe and intervening reversing portions at which the direction of the continuous fiber elements reverses, and means for holding the continuous fiber elements in place on the surface of the pipe and for caoting the continuous fiber elements with resin.

An apparatus for longitudinally reinforcing continuously generated plastic pipe comprising means for winding a plurality of fiber elements circumferentially onto the pipe, means for depositing continuous fiber elements longitudinally onto the surface of the pipe in a nip formed between the surface of the pipe and the fiber elements being circumferentially wound onto the pipe, and rollers contacting the surface of the pipe at the nip, the circumferential fiber elements passing over the rollers and onto the surface of the pipe.

An apparatus for longitudinally reinforcing continuously generated plastic pipe comprising means for winding a plurality of fiber elements circumferentially onto the pipe, first and second oscillating sources for depositing continuous fiber elements longitudinally onto the surface of the pipe in a nip formed between the surface of the pipe and the fiber elements being circumferentially wound onto the pipe, said oscillating sources each having an outlet end for the longitudinal fiber elements that is positioned adjacent to the nip, and means for oscillating the osciallating sources such that the outlet ends move in opposite directions and substantially parallel to the longitudinal axis of the pipe.