| US 7,381,454 B1 | ||
| Tubular product | ||
| Kari Kirjavainen, Espoo (Finland); and Jyri Järvenkylä, Hollola (Finland) | ||
| Assigned to Uponor B.V., Amsterdam (Netherlands) | ||
| Filed on Dec. 18, 1997, as Appl. No. 8/981,360. | ||
| Application 08/981360 is a division of application No. PCT/FI96/00359, filed on Jun. 20, 1996. | ||
| Claims priority of application No. 953162 (FI), filed on Jun. 26, 1995; application No. 9503272 (SE), filed on Sep. 20, 1995; application No. 961540 (FI), filed on Apr. 04, 1996; and application No. 961822 (FI), filed on Apr. 29, 1996. | ||
| Int. Cl. B32B 1/08 (2006.01); B32B 15/085 (2006.01); B32B 5/18 (2006.01); B32B 5/20 (2006.01); B32B 7/12 (2006.01); B32B 27/32 (2006.01); F16L 9/01 (2006.01); F16L 9/12 (2006.01); F16L 9/133 (2006.01); F16L 9/147 (2006.01); F16L 55/18 (2006.01); F16L 21/00 (2006.01); E21D 11/00 (2006.01) | ||
| U.S. Cl. 428—36.9 [428/36.91; 428/35.9; 428/36.5; 428/308.4; 428/317.5; 428/319.1; 428/319.7; 428/319.9; 138/97; 138/140; 138/141; 138/143; 138/146; 138/149; 138/155; 285/15; 285/397; 285/398; 405/150.1; 405/184.2] | 18 Claims |
| 1. A tubular product comprising at least a tubular material base layer, an innermost layer of plastic, the tubular material
and the plastic having poor adhesion to each other, and a layer of foamed plastic between and itself adhered to the base layer
and the innermost layer as a tying layer therebetween by being of adhesion plastic continuously and meltingly extruded simultaneously
with the innermost layer against the base layer, characterized in that
the base layer is made of metal or plastic-coated metal, and
the innermost layer and/or the tying layer is cross-linked polyethylene, or
the tying layer consists of grafted polyethylene.
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