Stock material or miscellaneous articles – Structurally defined web or sheet – Including variation in thickness
Patent
1982-12-14
1984-11-13
Van Balen, William J.
Stock material or miscellaneous articles
Structurally defined web or sheet
Including variation in thickness
156 77, 156205, 428186, 428188, B32B 106, F16L 5908, F16L 5902
Patent
active
044825978
DESCRIPTION:
BRIEF SUMMARY
The invention relates to insulating materials.
Insulating material formed of blocks of foamed polymeric materials, such as polystyrene or polyurethane, disposed on an elongate flexible web and spaced from each other are extensively used for the thermal insulation of pipes etc. The blocks may be of various shapes and sizes from beads to flat elements having a trapezoidal cross-section. However, such insulating materials have the disadvantage of being bulky and since it is sold in rolls, these take up a large amount of storge space. Moreover, the insulating materials do not have very effective flame resistance properties.
According to the present invention there is provided an insulating material comprising a flexible web of impervious material, a plurality of individual strips of insulation material extending transverse to the longitudinal axis of the flexible web and completely encompassed by impervious material, and a metal foil forming at least one outer surface of the insulating material.
In a preferred form the strips of insulation material are spaced from each other by at least the width of one strip which will allow one to intersperse two web structures. The impervious material of the web is preferably a polymeric material.
In a preferred form parallel strips are spaced along the length of the web transverse to the length of the web. In a particularly preferred form the insulating material can be held in pockets of polymeric material attached to or forming part of the web. Thus the web can be two sheets of polymeric material joined together at spaced points to form pockets within which is located the insulating material.
The insulation material can be any porous material which can be used for insulation and thus can be synthetic polymeric foam such as polyurethane or polystyrene which can be in blocks or similar shapes or in particle form. There can also be used porous material derived from natural organic products such as cellulose foams or inorganic materials such as fiber-glass, mica-fill, rock wool, Perlite bead or powder, and similar materials. Some of these materials may have to be treated to enhance their flame resistance although it is an advantage of the invention that the choice of a suitable web material avoids specific treatment of the porous material. The term porous signifies that the material entraps bodies of air by reason of a cellular or fiborous particulate structure and therefore need not include a material which has specific pores within individual portions of the material. Thus the porous structure could arise from the loose structure of a powder material.
The insulating material according to the present invention advantageously combines the insulating properties of the insulation materials and metal foil. Moreover, the insulation material is completely surrounded by a polymeric material which prevents entry of damp which would otherwise affect the insulating and other properties of the insulation material. The presence of the polymeric web serves to strengthen the structure while the presence of metal foil such as aluminium foil provides excellent flame resistance and insulating properties.
The separation of the strips of insulation material gives greater flexibility than insulating webs of the known art. This flexibility permits, because of the very pliable web between the strips, a folding or pushing together of the strips of insulation material so as to provide maximum insulation in use.
The final product is much more easily handled than prior art forms in terms of rolling and storage, and the degree of insulation can be controlled by the degree to which the individual strips are pushed together and the insulating mateial with its significant distance between strips provides unexpectedly excellent insulation properties.
Although the insulating material is intended to be used for insulation it can be utilised in packaging when the transverse strips are formed of foamed polymeric material.
Embodiments of the present invention will now be described, by way of example, with refe
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patent: 3813279 (1974-05-01), Varner, Jr.
patent: 4304824 (1981-12-01), Karpinski
patent: 4333978 (1982-06-01), Kocher
Spic International Limited
Van Balen William J.
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