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US 4,053,343 AGranted
Methods of making fiber reinforced plastic pipe
AssigneeCiba-Geigy Corporation
InventorJ. Warne Carter
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AssigneeCiba-Geigy Corporation
InventorJ. Warne Carter
Estimating the term…
In a continuous method of making pipe from fiber elements coated with a thermosetting resin, the coated fiber elements are wrapped around a resin saturated conveyor tube which becomes an integral part of the finished pipe assembly. The method of manufacture employs a first mandrel section and a second mandrel section in alignment therewith and longitudinally spaced therefrom by a gap. A tube of resin-absorbent material is applied to the first mandrel section, a thermosetting resin is applied to the tube as it passes over the gap in an amount sufficient to saturate the tube. The resin is at least partially cured prior to its arrival onto the second mandrel section where it provides the conveyor tube for the application thereto of a plurality of bands of continuous fiber elements coated with a thermosetting resin composition.
A method of continuously making fiber reinforced plastic pipe devoid of an inner removable liner comprising providing a first mandrel section and a second mandrel section in alignment therewith and longitudinally spaced therefrom by a gap, providing a tube of resin-absorbent material upon said first section, continuously advancing the tube across the gap and over the second mandrel section, applying a thermosetting resin to the tube as it passes over the gap in an amount sufficient to saturate the tube, at least partially curing the resin prior to the arrival of the advancing resin-saturated tube onto the second mandrel section to provide a conveyor tube, applying a plurality of bands of thermosetting resin composition coated continuous fiber elements onto said conveyor tube, and curing the resin to provide a fiber reinforced pipe assembly having the conveyor tube integral therewith.
A method of continuously making fiber reinforced plastic pipe comprising providing a first mandrel section and a second mandrel section in alignment therewith and longitudinally spaced therefrom by a gap, applying a tube of resin-absorbent material upon said first section, applying reinforcing strands coated with a substantially dry, partially gelled thermosetting resin upon the tube while the tube is on the first mandrel section, applying heat sufficient to cause the strands to be bonded to the tube while inhibiting the flow of resin to the inner side of the tube, the heat being applied while the advancing tube is on the first mandrel section, continuously advancing the tube across the gap and over the second mandrel section, applying a thermosetting resin to the tube as it passes over the gap in an amount sufficient to saturate the tube, at least partially curing the resin prior to the arrival of the advancing resin-saturated tube onto the second mandrel section to provide a conveyor tube, applying a plurality of bands of thermosetting resin composition coated continuous fiber elements onto said conveyor tube, and curing the resin to provide a fiber reinforced pipe assembly having the conveyor tube integral therewith.
Dependencies are inferred from the claim text.