Pipes and tubular conduits – Flexible – Spirally wound material
Patent
1998-08-26
2000-02-15
Hook, James
Pipes and tubular conduits
Flexible
Spirally wound material
138122, 138132, 138144, 138153, 138154, F16L 1104
Patent
active
060241349
ABSTRACT:
A laminated tape comprising a main layer of a polyester-series thermoplastic polyurethane resin and a covering layer formed of a soft vinyl chloride resin fused with at least one surface of the main layer is spirally wound, and its adjacent side edges are bonded each other to form a hose wall. The shrinkage ratio of the length of the hose in an unloaded condition is 25% or less relative to the original length of the hose as determined by measuring the original length and the length of the hose after the test which comprises subjecting the hose compressed in a longitudinal direction to ten heating/cooling-cycles successively, one cycle comprising a heating step for exposing the compressed hose to an atmosphere of 70.degree. C. for two hours and a cooling step for cooling the heat-treated hose at an atmosphere of -20.degree. C. for two hours, followed by returning the temperature of the hose to an ordinary or room temperature and allowing the hose to stand for one hour. According to the present invention, the drawbacks such as the strong inclination to shrink and the great pressure loss are improved, and the degradation of various physical properties by ultraviolet ray and hydrorization is prevented.
REFERENCES:
patent: 3524779 (1970-08-01), Masters et al.
patent: 3886029 (1975-05-01), Poulsen
patent: 4081302 (1978-03-01), Drostholm et al.
patent: 4445543 (1984-05-01), Mead
patent: 4657049 (1987-04-01), Fourty et al.
patent: 5538513 (1996-07-01), Okajima
patent: 5918642 (1999-07-01), Akedo et al.
Akedo Youichi
Hattori Shoji
Inagake Tetsuya
Kodama Hitoya
Morikawa Masataka
Hook James
Tigers Polymer Corporation
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