Stock material or miscellaneous articles – Hollow or container type article – Polymer or resin containing
Patent
1996-09-16
1998-08-18
Choi, Kathleen
Stock material or miscellaneous articles
Hollow or container type article
Polymer or resin containing
428 365, 428 3691, 138122, 138129, 138137, 138149, 138150, 138154, F16L 5914, F16L 5502, B32B 528, C04R 4312
Patent
active
057956340
ABSTRACT:
A heat insulating noise reducing duct includes: an internal layer formed by helically winding a flat fibrous band and integrally bonding outer circumferential faces of adjacent joint parts of the band by resin reinforcing bands to thereby form a substantially smooth cylindrical shape; one or more resin linear bodies helically wound between these adjoining resin reinforcing bands and bonded to the fibrous band; an open-cell foam layer formed by helically winding an open-cell foam resin band onto an outer circumferential face of the inner layer while making its paired side edges abut each other; an intermediate sheet layer formed by helically winding a thin resin sheet-like band onto an outer circumferential face of the open-cell foam band while partially overlapping the resin sheet-like band, and by integrally bonding the overlapped parts; a closed-cell foam layer formed by helically winding a closed-cell foam resin band onto an outer circumferential face of the sheet layer while making its paired side edges abut each other; and an external layer formed by helically winding a thin resin sheet-like band onto an outer circumferential face of the closed-cell foam layer while partially overlapping the resin sheet-like band and by integrally bonding the overlapped parts. The fibrous band, the resin reinforcing band, the resin linear body, the open-cell foam resin band, the resin band forming the intermediate sheet layer, the closed-cell foam resin band, and the resin band forming the external layer are wound at an identical helical pitch.
REFERENCES:
patent: 3885593 (1975-05-01), Koerber et al.
patent: 4239064 (1980-12-01), Gilman
patent: 4590108 (1986-05-01), Nippe
patent: 4615411 (1986-10-01), Breitscheidel et al.
patent: 5607529 (1997-03-01), Admczyk et al.
Singapore Search Report dated Dec. 5, 1997.
Choi Kathleen
Totaku Industries, Inc.
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