NL8300529A - Foamed sheet material, in particular irradiated cross-linked foamed polyethylene foam, with surfaces for applying conventional coatings / adhesives, paints and similarly of the same type. - Google Patents

Description

- Ί * 833012 / vdV / kd

Brief designation: Foamed sheet material, in particular irradiated cross-linked closed-cell foam polyethylene, with surfaces for applying conventional coating adhesives, paints and plasters, as well as a process for the production of such sheet material.

At present, various types of insulating materials are widely used in the building industry and materials have recently been developed to be applied to erect or existing plates and walls to provide heat insulation and sound insulation, water impermeability and vapor impermeability. improve such plates and walls. Energy savings studies have shown that for healthy human beings, heat comfort depends primarily on two factors: operating temperature and relative humidity in the ambient air. The working temperature is the average of the thermometer temperature of the air and the weighted average of the surface temperatures of the walls of the room. The surface temperature of the walls is therefore extremely important.

A material currently widely used for heat insulation and sound insulation of ceilings and floors is a radiation-linked (physical cross-linking or cross-linking) closed-cell polyethylene foam sold in Italy by the Applicant under the name Isolmant (trademark). Such a material is supplied in sheets or web of equal thickness; it has a light weight and is flexible; has very good insulating properties even at very small thickness; is fire resistant, self-extinguishing, resistant to bacteria and is not affected by insects or fungi. However, such a material is unsuitable for wall applications as the smooth, glossy, non-adherent surface will not be used.

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-2- properties and for adhering to a floor surface or for adhering a coating to this material, adhesives are required for chemical attack of the surface. Such adhesives are difficult to use and require a great technical skill on the part of the processor. This has heretofore limited the use of Isolmant on walls or for other purposes where an insulating sheet is to be adhered to a support surface or where the insulating sheet is to act as a support for a coating.

The problem has therefore arisen to make the surface of such sheets suitable for the operation of "pressure" type adhesives (ie adhesives which adhere under pressure) and to make the surface suitable for different types of adhesives. as normally used by craftsmen who apply coatings, paints, or other wall coverings.

This problem is solved by the sheet-like material according to the invention, which consists of a sheet of foamed plastic to which a thin layer of a fabric or nonwoven is coupled on at least one surface.

Preferably, the sheet material is an irradiated cross-linked closed cell polyethylene foam obtained by physical irradiation. However, the material can also be chemical foamed polyethylene or neoprene products or the like. Preferably, both fabric or surfaces of the sheet material are coupled to a fiber web. The latter is partially included in the surface of the foam plastic sheet. In general, the nonwoven fabric consists of polyester, in particular a short 100% polyester resinate fiber (styrene-butadiene resin which is free from formaldehyde). However, it is also possible to use a woven fiber, for example meshes or nonwoven fiber webs. , synthetic or man-made materials which have been pretreated, if desired, to make them resistant to fire.

The new sheet-like material can be made adhesive 8300529-3 or adhesives can be applied by means of the so-called (pressure-sensitive) adhesives, or also by the usual coating adhesives; paints, plasters, and also wallpaper can be applied to these sheets. This allows use by even unskilled persons and on any substrate. It can be used easily and with very favorable aesthetic effects on walls that are then finished in a known manner. The material may also be presented in rolls with a protected adhesive surface, as is well known in other areas, through a removable protective layer.

Another object of the invention is to provide a method for manufacturing the sheet material according to the invention. Such a method includes coupling a flexible foam plastic base sheet, generally having a sheet of irradiated cross-linked (physical cross-linking) closed cells, polyethylene foam, and at least one thin fiber layer, preferably a generally polyester fiber ~ ~ fibrous web, using a temperature higher than room temperature and at a sufficient pressure to adhere this layer to the sheet. Preferably, the method is carried out continuously on a web of foamed sheet material which is unwound from a roll; a web of fiber material is applied to each side of the web and coupling takes place between each fiber web and the opposite face of the foam plastics web at certain locations, and includes heating the foam plastics web just before the coupling, to a temperature of 80 to 110 ° C and heating each fiber material just before coupling to a temperature of 80 to 60 ° C, generally about 40 ° C. A pressure of 7 to 7.5 atmospheres is preferably used, but other pressures are also possible.

The invention will now be elucidated by an exemplary embodiment with the aid of the drawing, in which: 8300529 -4-

Fig. 1 - shows a perspective view of a part of the sheet-shaped material according to the invention;

Fig. 2 - shows a schematic view of the method according to the invention.

5. As shown in Fig. 1, a new sheet of shaped material 10 of the present invention comprises a flexible layer or a flexible sheet of foamed plastic 11 on which a thin fabric layer is applied (this term includes both a woven fabric and a nonwoven fabric). schematically represented by the number 12. The fabric is partially incorporated into the surface of layer 11 to form one whole with it, but is exposed on the surface thereof to provide a certain roughness to this surface. Preferably, the sheet material is an irradiated cross-linked (by physical cross-linking) closed cell foamed polyethylene. Such a material is known as IscJnant (trademark). However, such a material could also be a chemically foamed polyethylene or one of the various neoprene products and the like. For the sake of simplicity, reference will only be made below to foamed polyethylene.

In general, the fabric is a polyester fleece 2 of 20 g / m, preferably resin-coated '25 (styrene-butadiene resin, free from formaldehyde) 100% short polyester fibers, although the use of other materials such as gauze or nonwovens of natural, synthetic or man-made textile products.

A currently preferred method of manufacturing the sheet 10 will be described below.

The foamed polyethylene backsheet or bottom sheet 11 is coupled with a thin sheet 12 or two thin sheets or webs of nonwoven material, these elements being brought into contact after heating the base sheet to a relatively high temperature with respect to room temperature, close to the softening 8300529 • «

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-5 temperature / i.e. at a temperature of about 80 to 110 ° C, preferably 80 to 90 ° C. The fiber film (s) or web is preferably preheated to a temperature of from 20 to 60 ° C, generally to about 40 ° C. If a low pressure is used which is sufficient to effect adhesion between the fibrous layer and the base sheet, such a pressure is 7 to 7.5 atmospheres.

Preferably, the method is carried out continuously as described below with respect to FIG.

2. A web 20 of a foamed polyethylene base sheet is unwound from a roll 21. and fed in the direction of arrow A. Continuing movement in a web along the intermediate rolls 22, 23, this web is wound in a circumferential section of a heating roller 24, wherein a heating unit, generally a gas burner shown schematically at 25, provides the heating for heating the surface of web 20 opposite the surface of the roller, to a temperature of 80 to 110 ° C, preferably 80 to 90 ° C.

At the same time, a first web of fabric is indicated with 27, generally a polyester fiber web, unwound from a supply roll 28 and passed to an intermediate roll 29, followed by heat unit 30 generally of the lamp type, which dissipates the heat 25 to heat this web 27 to a temperature of about 40 ° C. The next intermediate stage is to contact this foamed polyethylene web and this first nonwoven web or web 27 at a nip between the cylinder 31 and a circumferential cross-section 30 of a cylinder or roll 24. The pressure applied at this point is preferably 7 to 7.5 atmospheres. However, it should be noted that pressures slightly smaller or slightly larger can also be used. The average temperature in the coupling zone is preferably 20 to 25 ° C.

The obtained web 32, coated on a fabric or nonwoven surface, is guided along the surface of another heating cylinder 33, with the coated surface 8300529-6 positioned against the cylinder. The uncoated face is heated by a heating unit 35 generally a gas burner, to a temperature of about 80 to 110 ° C, preferably 80 to 90 ° C.

At the same time, a second web of fabric or nonwoven fabric, generally a polyester fiber web 37, is unwound from a supply roll 36. This web 37 may be of the same or a different material as web 27. This web 37 moves under an intermediate cylinder 38. through and along a heating unit, generally a heating lamp 40 for heating to a suitable temperature. A suitable temperature for a polyester fleece of short polyester fibers is about 20 to 60 ° C, generally 40 ° C.

Subsequently, the second fabric or nonwoven web is continuously applied to web 32 on the uncoated surface of the latter, at the nip between a delivery cylinder 41 and cylinder 33, preferably using a pressure of 7 up to 7.5 atmospheres. In this way a web 42 is obtained, which is coated on both surfaces by fabric layers or nonwoven layers 27 and 37. Then the web 42 is cooled, for example by passing it along an air-cooling roller 43, and then subjected to a known stabilization treatment and from here to a packing unit.

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Claims (9)

1. Sheet-shaped material comprising a layer of foamed plastic material, and a web or layer of fiber material on at least one surface thereof, which fiber layer which is integral with the surface is at least partly exposed thereon, characterized in that this layer is flexible and the fabric layer or the nonwoven fabric is partially incorporated into said surface or surfaces. 2. Sheet-shaped material according to claim 1, characterized in that the foam plastic has a foamed polyethylene which is cross-linked, closed cells. - 3. Sheet-like material according to claim 1, characterized in that the fabric is selected from a nonwoven fabric containing polyester fibers. Sheet material according to claim 1, characterized in that the fabric is a resin-coated fiber web of short 100% polyester fibers weighing 20 g / m 2, the resin consisting of a formaldehyde-free styrene-butadiene resin. 5. Sheet material according to claim 1, characterized in that the fabric consists of a woven or non-woven fabric containing natural fibers. 6. A method of manufacturing a sheet material according to claim 1, characterized in that this method comprises: preheating a sheet or layer of said foam plastic; preheating a sheet or thin layer of a fabric or nonwoven fabric; contacting these sheets together under low pressure. 7. Method according to claim 6, characterized in that the preheating is carried out by means of lamp heaters. Process according to claim 7, characterized in that the foam plastic is a physically cross-linked, closed-cell foamed polyethylene and the 8300529 -8-9t fabric consists of a resin-coated fiber web of short 100% polyester fibers, .m The characteristic is that the foam plastic is preheated to a temperature of 80 to 110 ° C and the fabric or nonwoven fabric is preheated to a temperature of 20 to 60 ° C before contacting the foam plastic and the fabric or web and these materials are brought into contact with each other at a pressure of 7 to 7.5 atm. 9. A method according to claim 8, characterized in that the preheating of the foam plastic takes place with the aid of gas burners. 8300529