FR2845754A1 - Reflection-type heat and sound insulation sheet comprises a backing of graded and needle-punched glass fibers covered with films of metallic reflecting material on one or both surfaces - Google Patents

Abstract

A reflection-type heat and sound insulation sheet (1) comprises a backing (20) of insulating material covered, at least on one large dimension side, with a film (10a, 10b) of metallic reflecting material. The backing consists of graded and needle-punched glass fibers. The glass fibers are made of E-type glass, which renders the backing incombustible. The diameters of the filaments are relatively the same and are 6-13 microns. The thickness of the backing (20) is 6-12 mm. Each metallic reflecting film (10a 10b) is made of aluminum and has a thickness of 20-50 microns. A film of metallic reflecting material identical to each metallic reflecting film (10a, 10b) present on the backing (20) may be located within the backing (20). The backing (20) is crocheted across the film present in the backing (20). An Independent claim is given for the production of a reflection-type heat and sound insulation sheet (1), which comprises producing a backing (20) of insulation material by needle-punching graded glass filaments, and then covering the backing (20) of insulation material, on a least one of its large dimension sides (20a, 20b), with a film of metallic reflecting material (10a, 10b).

Description

The present invention relates to an insulating sheet having

properties

thermal and acoustic.

  In the family of thermal insulators, there are latest generation insulators mainly using reflection as a means of insulation against radiation. These insulators are called reflective insulators. These insulators generally consist of two layers of shiny polished aluminum separated by a blanket of insulating material. The insulating material of the mattress is mainly intended to slow down the conduction phenomenon, while the aluminum layers are mainly intended to reflect infrared radiation. The effective combination of these two types of layer is responsible for the reduction in thickness of this layer.

  type of reflective insulation compared to single layer insulation.

  Among the best known reflective insulators, there are those whose mattress is made of foam or polyethylene bubbles. These insulators have demonstrated that despite a thickness close to a centimeter, they are as effective as the traditionally used insulators of thicknesses ranging from 200 to 250 mm. However, this type of synthetic insulation has the major disadvantage of having a low

fire resistance.

  Other reflective insulators offered include a mattress of mineral fibers. The mineral fibers of this mattress are linked by an organic binder 20 making it possible to improve the mechanical strength of the panel. This mattress has a

  improved fire resistance compared to synthetic mattresses.

  However, the binder used is a combustible product which cannot be reduced in proportion below a certain damaging threshold from a mechanical point of view.

  In order to avoid the loss of mechanical strength, the mattress must then be reinforced by a reinforcing veil or by an increase in the thickness of the mineral fiber mattress. Insulators as described above are usually classified in accordance with current fire regulations, standard NF P92501, in class Ml. The MI class corresponds to so-called non-flammable products. In practice, the use of products classified as MI corresponds to a very high degree of security. However, the existence of an MO category corresponding to the so-called products

  non-combustible, creates a demand to be met.

  The object of the invention is therefore to propose a non-combustible insulating sheet that does not

  not having the disadvantages mentioned above.

  To this end, the present invention provides an insulating sheet of the reflective type comprising a mattress of insulating material covered on at least one of its larger walls by a film of reflective metallic material. The present invention is characterized in that said mattress consists of glass filaments

calibrated and needled.

  According to another characteristic of the invention, said glass filaments are in

  type E glass, which makes the mattress non-combustible.

  According to another characteristic of the invention, said glass filaments are of

relatively homogeneous diameters.

  According to another characteristic of the invention, said glass filaments

  have diameters between 9 and 11 microns.

  Advantageously, said mattress has a thickness of 6 to 12 mm.

  According to another characteristic of the invention, said or each film is made of alummium.

  Advantageously, said or each film has a thickness of 20 to 50 microns.

  According to another characteristic of the invention, said mattress further comprises

  a film of reflective metallic material.

  Advantageously, said film of reflective material present in said mattress is identical to said or to each film of reflective material present on said mattress. According to another characteristic of the invention, said mattress is needled

  across said film present in said mattress.

  The present invention also relates to a method for producing an insulating sheet of the reflective type. The method according to the invention is characterized in that it consists in producing a mattress of insulating material by needling of calibrated glass filaments, then in covering said mattress on at least one of its larger walls with a film of material metallic reflective According to another characteristic of the invention, said method consists in extruding said glass filaments in dies of relatively homogeneous diameters of

  so as to obtain filaments of relatively homogeneous diameters.

  According to another characteristic of the invention, said method consists in making

  pass a group of filaments through a needling machine.

  According to another characteristic of the invention, said method consists in

  needling said mattress through a film of reflective material.

  According to another characteristic of the invention, said method consists in bonding

  said or each reflective film on a wall of larger dimensions of the mattress.

  The features of the invention mentioned above as well as others

  will appear more clearly on reading the following description of an exemplary embodiment, said description being made in relation to the attached drawings, among which 10:

  Fig. 1 shows a schematic sectional view of an insulating sheet according to a first embodiment of the invention;

  Fig. 2 shows an enlarged view of detail D in FIG. 1.

  Fig. 3 shows a schematic sectional view of an insulating sheet according to a second embodiment of the invention;

  An insulating sheet 1 according to the invention is an insulating sheet of the reflective type.

  This sheet 1 comprises a mattress 20 of insulating material bordered on at least one of its larger walls 20a, 20b by a layer 1Oa, I Ob of advantageously polished and shiny metallic material, preferably of pure annealed aluminum to 20 99 %. Advantageously, the mattress 20 is bordered on each of its walls more

  large dimensions of a layer 1Oa, i Ob of metallic material. In a first embodiment of the invention shown in FIG. 1, these layers i Oa and I Ob are identical films with a thickness of 20 to 50 microns. The role of these films 10a, 10b in the sheet 1 is essentially to reflect the infrared radiation which they receive in order to block the heat transfers by radiation.

  The mattress 20 placed between the films 10a, 1 Ob consists essentially of glass filaments. The glass used is preferably glass E mainly consisting of oxides of silicon, aluminum, calcium, boron and magnesium melted to form an amorphous vitreous state. These filaments are calibrated in dies so as to obtain a uniform diameter for all of the filaments. This

  diameter is preferably between 6 and 13 microns.

  The mattress 20 according to the invention is made from a group of glass filaments having undergone needling. The needling technique consists in making

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  pass the group of filaments through a machine which, using needles, mechanically entangles the filaments inside the group of filaments. The filament bundles are moved from a horizontal position to a vertical position, thus creating a pseudo-binding wire 200 (See Fig. 2). By this technique, a mattress of resistant, incombustible glass filaments with a thickness of, for example, between 6 and 12 mm is formed. The mattress thus produced has a

  good long-term mechanical strength.

  From the mattress of glass filaments, the insulating sheet 1 according to the invention is produced preferably by bonding the reflective films 1Oa and 1Ob on either side of the mattress. The adhesive 30 used is, for example, heat reactivatable adhesive. A

  detail D of the ply 1 obtained is shown in FIG. 2.

  In another embodiment of the invention shown in FIG. 3, the sheet 1 also comprises a mattress 20 of needled glass filaments. On the other hand, in this embodiment the mattress 20 further comprises, for example approximately 15 in the middle of its width, a reflective film 1Oc preferably identical to the reflective films 1 Oa and 1 Ob which are placed on either side of the mattress

  20. The needling of the mattress 20 is then carried out through the reflective film 1 Oc.

  An insulating sheet 1 according to the invention must be placed at a distance from the surface

  in contact with the outside so as to leave an air space necessary for good insulation and to avoid thermal bridges.

  It will be noted that these glass filaments E are very different from a conventional glass wool. In glass wool, the glass used is glass C with a melting temperature of the order of 450 ° C., the fibers of which have heterogeneous diameters. The diameter of the fibers is important from a health point of view, because the fibers of diameter less than 25 to 3 microns are said to be breathable (see directive 97/69 / EC) and are therefore

  dangerous to health. These fibers are indeed carcinogenic.

  The glass filaments used to manufacture the mattress 20 according to the invention are made of glass E. The glass E is, with respect to type C glass, on the one hand, more mechanically resistant and, on the other hand more thermally resistant, because its melting temperature is around 8650C. This type of glass is also known in the nautical environment for not being afraid of humidity. Finally, with a homogeneous diameter expected to be between 6 to 13 microns, therefore greater than 3 microns, the filaments are classified as non-carcinogenic. In fact, according to Directive 97/69 / EC, fibers are

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  considered non-breathable and therefore not carcinogenic if their geometric mean diameter weighted by the length minus two standard errors is greater than 6 microns.

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Claims (11)

  1) Insulating sheet (1) of the reflective type comprising a mattress (20) of insulating material covered on at least one of its larger walls (20a, 20b) by a film (10) of reflective metallic material, characterized in that that said   mattress (20) consists of calibrated and needled glass filaments.   2) insulating sheet (1) according to claim 1, characterized in that said   glass filaments are made of type E glass, which makes the mattress (20) non-combustible.   3) insulating sheet (1) according to claim 1 or 2, characterized in that   said glass filaments are of relatively homogeneous diameters.   4) insulating sheet (1) according to claim 3, characterized in that said 10 glass filaments have diameters between 6 and 13 microns.   ) Insulating sheet (1) according to one of the preceding claims, characterized   in that said mattress has a thickness of 6 to 12 mm.   6) insulating sheet (1) according to one of the preceding claims, characterized   in that said or each film (10) is made of aluminum.   7) insulating sheet (1) according to one of the preceding claims, characterized   in that said or each film has a thickness of 20 to 50 microns.   8) insulating sheet (1) according to one of the preceding claims, characterized in   that said mattress (20) further comprises a film (10c) of reflective metallic material. 9) insulating sheet (1) according to claim 8, characterized in that said film of reflective material (10c) present in said mattress 20 is identical to said or to   each film of reflective material (l Oa, 1 Ob) present on said mattress (20).   ) Insulating sheet (1) according to claim 8 or 9, characterized in that   said mattress (20) is needled through said film (1 Oc) present in said mattress 25 (20).   11) Method for producing an insulating sheet (1) of the reflective type, characterized   in that it consists in producing a mattress (20) of insulating material by needling of calibrated glass filaments, then in covering said mattress (20) on at least one of its larger walls (20a, 20b) with a film (10) of reflective metallic material. 7 2845754   12) A method of developing an insulating sheet (1) according to claim 11, characterized in that it consists in extruding said glass filaments in dies of relatively homogeneous diameters so as to obtain filaments of diameters relatively homogeneous.   13) A method of developing an insulating sheet (1) according to claim 11 or 12, characterized in that it consists in passing a group of filaments through a needling machine.   14) Method for developing an insulating sheet (1) according to one of   Claims 11 to 13, characterized in that it consists in needling said mattress (20) 10 through a film of reflective material (10C).   ) Method for producing an insulating sheet (1) according to one of   Claims 11 to 14, characterized in that it consists in gluing said or each film   reflective (1 Oa, 1 Ob) on a larger wall of the mattress (20).