Stock material or miscellaneous articles – Structurally defined web or sheet – Including aperture
Patent
1987-02-27
1988-09-13
Thomas, Alexander S.
Stock material or miscellaneous articles
Structurally defined web or sheet
Including aperture
428137, 428198, B32B 310
Patent
active
047709197
DESCRIPTION:
BRIEF SUMMARY
The invention concerns a multilayer insulating body according to the preamble of claim 1, a process for its preparation and its application.
Insulating bodies are used for example as protective sheets to obtain thermal and/or humidity insulation, either to protect persons against temperatures and/or humidity or to protect plants, machines, construction sites, etc. against weather effects.
Protective sheets, in particular multilayer sheets are also used as attenuating materials against impacts or the like.
Thus for example a so-called step sheet is known; it consists of two plastic sheets bonded together over part of their surfaces, at least one of then comprising a plurality of cup like bulges. The two sheets are bonded together at their locations outside the bulges in a manner such that air is enclosed tightly in the bulging parts extending away from the other plastic sheet. Pressure applied to the sheet compresses the air in the cuplets. Impacts or the like may be attenuated in this manner. However, the manufacture of such stepped films is relatively expensive. In the process, usually a flat sheet to which the bulges are to be applied, is passed over a roll the surface of which comprises cup like recesses. The film is drawn in part into the recesses, i.e. it is deep-drawn. A second sheet is then placed onto the first which is still on the roll and completely bonded to it in the loactions outside the bulges. The deep drawing process results in different wall thicknesses of the sheet comprising the bulges.
Multilayer insulating bodies are further known in which a plastic sheet is laminated to the aluminum foil. Sheets of this type are used for example in camping as substrates to retain the heat of the human body.
Single layer insulating bodies, for example foil, are also used to cover plants. Thus, for example DE-A-No. 2 450 114 describes a plastic foil in the form of a sheet to cover low growing plants, in which slits aligned in the longitudinal direction of the sheet make possible expansion in the transverse direction of the sheet, in keeping with the growth of the plants.
It is the object of the invention to provide an insulating body of the aforementioned generic type, having further advantages relative to the known insulating bodies.
This object is attained by the characteristic clause of claim 1. The insulating body according to the invention comprises between the two outer layers an inner layer containing fibers, wherein at least the two outer layers are bonded, preferably welded, to each over part of their surfaces. However, the two outer layers may also be adhesively bonded together through the intermediate layer or with the latter. In the area of the bonded locations passages penetrating through the entire insulating body are further arranged. The fibers may consist in particular of textile fibers.
The fibers of the intermediate layer have different functions. In areas where there are no bonded locations, the fibers, which are then loose, serve to maintain the two outer layers spaced apart, whereby an air cushion is formed between said outer layers and the spacer fibers. In the bonded locations the fibers welded or adhesively bonded together with the outer layers serve to reinforce the bonds.
In this manner a multilayer insulating body is obtained, which has insulating effects, while remaining permeable.
The joint locations may have different surface configurations. In addition to point shaped joints, strip bonds are preferred. These strip like bonds may be arranged so that the strips are in rows constituting the longitudinal extent. Welded joints of adjacent rows may be offset relative to each other and in particular they may mutually overlap. This results in an insulating body having different bend elastic properties in the longitudinal and the transverse directions.
The joint locations may be laid out in a distribution of the entire insulating bodies. In particular, strip like joint locations may be aligned of the surface of the insulating body so as to form a pattern.
The insulating body is p
REFERENCES:
patent: 2781820 (1957-02-01), Rogers
patent: 3020183 (1962-02-01), Calvaresi
patent: 3975859 (1976-08-01), Muller
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