Patent ID: 9662826
Date: 2017-05-30
CPC Classifications: B29C,B29K,B29L,F16L,G01M

Claim:
1. Coilable dual wall corrugated plastic pipe, comprising: (a) an elongated section of hollow, generally cylindrical plastic pipe with a longitudinal axis, said pipe having an inner wall with a cylindrical substantially smooth inner surface and having a generally cylindrical corrugated outer wall with spaced apart successive annular peaks and annular valley defining portions therebetween, said inner wall being connected to said corrugated outer wall at said annular valley defining portions thereof; (b) said outer corrugated wall being composed primarily of high density polyethylene; (c) said inner wall being formed of a material blend composed of high density polyethylene and a thermoplastic elastomer; and (d) said material blend of said inner wall having a greater strain capacity and lower modulus of elasticity than said material of said corrugated outer wall, so as to provide sufficient flexibility and resiliency to facilitate bending and coiling of said pipe during transport and installation.