Stock material or miscellaneous articles – Structurally defined web or sheet – Discontinuous or differential coating – impregnation or bond
Patent
1987-11-25
1989-01-10
Cannon, James C.
Stock material or miscellaneous articles
Structurally defined web or sheet
Discontinuous or differential coating, impregnation or bond
1562753, 1562757, 1563082, 1563084, 1563244, 428247, 428286, 4283171, 4283177, 2143A, A41D 3102, B32B 326, B32B 712, B32B 2716, B32B 2732
Patent
active
047972530
DESCRIPTION:
BRIEF SUMMARY
This invention relates to a laminated fabric coated plastic material with well insulating properties and comprising plastic encapsulated air cells.
It is known to join or seal fabric and foamed neoprene rubber or other foamed plastic material to obtain a sheet-shaped material having a thickness in the range from some mm, said material being waterproof and having heat insulating, noise silencing and shock-absorbing properties.
A drawback of said materials based on foamed neoprene consists, however, in that their high price and great weight per unit af area set narrow limits to the field of application, for instance for garments, and their heat insulating ability is not so high as desirable.
U.S. Pat. No. 3,577,305 discloses a thermal and shock insulating material consisting of an air cell sheet formed from two very thin heat-sealed sheets of polyethylene or the like, one of which includes blisters, which by fusion with the second sheet are sealed, thereby forming air cells. Said air cell sheet is used together with a reflecting material, but this is only sealed to the air cell sheet at the edges thereof and is loosely resting on the central parts. Even though a reflecting material with a considerably mechanical strength was used for said material, it would not be able to substantially compensate for the deficient mechanical strength of the air cell sheet, and the material would not be appropriate e.g. as the sole material for sewing garments and the like. Moreover, a sheet of material cannot be cut out straightaway in a desired shape since, as mentioned, a sealing is required at the edges of the air cell sheet and the reflecting material.
In view of the above there is a demand for a material of the type concerned which has a particularly well heat-insulating ability, stands strong mechanical stress and is light and which is waterproof and extremely resistant to light and weather.
The material according to the invention possesses said properties and is characterized in that it is prepared by
(a) radiating an air cell sheet of polyethylene, known per se and consisting of two welded layers, one of which is plane and the other encloses blisters which together with the plane layer form airfilled cells with .beta.-and/or .gamma.-rays,
(b) coating one or both sides of the radiated air cell sheet with a web of hot melt adhesive film,
(c) coating the surface of said adhesive film with a web of fabric material, and
(d) heating the sheets for melting the adhesive film and compressing the heated sheets.
The obtained material is a hitherto unknown product possessing a combination of valuable properties, not only because the strong and permanent adhesion of the fabric and the air cell sheet increases considerably the resistance of this latter to mechanical stress, e.g. to tearing, but also because the radiation with .beta.- and/or .gamma.-rays changes the properties of the air cell sheet made of polyethylene so that the material becomes more resistant e.g. to light affection.
A material as that concerned cannot be prepared without the radiation stated in step a) since, on one hand, the air cell sheet could not be permanently joined with the hot melt adhesive sheet without previous radiation and, on the other hand, the air cell sheet would not be able to stand the pressure required to fuse the sheets at increased temperature, since the individual cells would be damaged by the pressure and the temperature required to activate the hot melt adhesive film.
It has proved that the radiation cannot be replaced by a so-called corona-processing that is the most common method of increasing the susceptibility of plastic materials inter alia to adhesives. Said processing does not offer the required increasing of the strength of the air cell sheet at high temperature and, moreover, the obtained improvement of the susceptibility to adhesives is not permanent.
The radiation in step (a) with .beta.- and/or .gamma.-rays entails, however, not alone an improved susceptibility to adhesives and an increased strength at a high temperature, but
REFERENCES:
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patent: 4225373 (1980-09-01), Bieler et al.
patent: 4318763 (1982-03-01), Bieler et al.
patent: 4436570 (1984-03-01), Neuhaus et al.
patent: 4469741 (1984-09-01), Akao
patent: 4565733 (1986-01-01), Akao
patent: 4608104 (1986-08-01), Holtrop
patent: 4609420 (1986-09-01), Aydin et al.
patent: 4649077 (1987-03-01), Lauehenauer
patent: 4695501 (1987-09-01), Robinson
Werner Laeis: "Einfuhr.mu.ng in die Werkstoffkunde der Kunststoffe", Munchen, 1972, pp. 219-220.
Herman V. Boenig: "Structure and Properties of Polymers", p. 251.
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