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Composite tubing

  • US 4,026,747 A
  • Filed: 12/15/1975
  • Issued: 05/31/1977
  • Est. Priority Date: 01/30/1975
  • Status: Expired due to Term
First Claim
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1. The method of making a composite tubular structure comprising longitudinally moving a rigidified continuous tubular core member, impregnating a strip of open-cell resilient foam material with a thermosetting resinous material, wrapping said impregnated foam strip about said core member, wrapping a layer of reinforcing elements about said foam material, urging said reinforcing elements radially inwardly to compress said foam material thereby causing said resinous material to fill the cells of said materials and to expel excess resinous material therefrom to encapsulate said reinforcing elements in said resinous material, and applying heat to hardened said resinous material while maintaining said foam in a compressed condition.

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