SOUND-PERMEABLE LINING FOR ACOUSTIC PLASTERBOARDS

Abstract

Sound-permeable lining (1) for covering perforations (21) shaped in an acoustic plasterboard (2). The sound-permeable lining (1) comprises a first ply (12) of a fleece material and attached thereto a second ply (14) which is arranged in between of the first ply (12) and the acoustic plasterboard (2) to which the sound-permeable lining (1) is to be applied. The second ply (14) being of a foil material having a second opacity O.sub.2 and a plurality of through-holes (141) formed therein. The first ply (12) has a first opacity O.sub.1 so that the through-holes (141) formed in the second ply (14) are invisible through the first ply (12) and so that the applied sound-permeable lining (1) has an overall opacity O.sub.12 to allow for optically covering the perforations (21) shaped in the acoustic plasterboard (2) and an overall air flow resistivity R.sub.s12 to allow for the penetration of air so that sound can propagate via the sound-permeable lining (1).

Claims

1. A sound-permeable lining (1) for covering perforations (21) shaped in an acoustic plasterboard (2), the sound-permeable lining (1) comprising first ply (12) of a fleece material having an inner structure so that the first ply (12) has a first air flow resistivity R.sub.S1 which allows for the penetration of air so that sound can propagate via the first ply (12) and attached thereto and a second ply (14) which is arranged in between of the first ply (12) and the acoustic plasterboard (2) to which the sound-permeable lining (1) is to be applied, the second ply (14) being of a foil material having a second opacity O.sub.2 and a plurality of through-holes (141) formed therein which are of a size and shape so that the second ply (14) has a second air flow resistivity R.sub.S2 which allows for the penetration of air so that sound can propagate via the second ply (13), wherein the first ply (12) has a first opacity O.sub.1 so that the through-holes (141) formed in the second ply (14) are invisible through the first ply (12) and so that the applied sound-permeable lining (1) has an overall opacity O.sub.12 to allow for optically covering the perforations (21) shaped in the acoustic plasterboard (2) and an overall air flow resistivity R.sub.S12 to allow for the penetration of air so that sound can propagate via the sound-permeable lining (1).

2. The sound-permeable lining (1) according claim 1, wherein the overall air flow resistivity R.sub.S12 is less than 300 Pas/m and the overall opacity O.sub.12 is in the range of 92% to 98%, in particular 95%.

3. The sound-permeable lining (1) according to claim 1, wherein the first ply (12) has the first opacity O.sub.1 in between of 50% to 75% to allow for covering the through-holes (141) in the second ply (14) of a size smaller than 500 m in diameter.

4. The sound-permeable lining (1) according to claim 1, wherein the fleece material has synthetic fibres, natural fibres and mixtures of synthetic fibres and natural fibres, in particular mixtures of polyethylene terephthalate fibres and cellulose fibres.

5. The sound-permeable lining (1) according to claim 1, wherein the first ply (12) has an areal density in between of 60 g/m.sup.2 and 130 g/m.sup.2.

6. The sound-permeable lining (1) according to claim 1, wherein the first ply (12) comprises color pigments.

7. The sound-permeable lining (1) according to claim 1, wherein the second ply (14) comprises a light reflective surface (142) at the side to be attached to the first ply (12) to allow for optically reflecting the first ply (2) thereon.

8. The sound-permeable lining (1) according to claim 1, wherein the second ply (14) is of a thickness less than 50 m, in particular less than 12 m.

9. The sound-permeable lining (1) according to claim 1, wherein the through-holes (141) are arranged in an areal density of more than 15 through-holes/cm.sup.2, in particular more than 50 through-holes/cm.sup.2, and are of a size in diameter smaller than 500 m so that the integrated cross-sectional area of the through-holes (141) per area of foil is of 0.05 to 0.20 cm.sup.2/cm.sup.2.

10. The sound-permeable lining (1) according to claim 1, wherein the first ply (12) is attached to the second ply (14) by a plurality of glue dots (13), each glue dot (13) being arranged at a location different from locations of the second ply (14) at which such a through-hole (141) of the plurality of through-holes (141) is formed.

11. The sound-permeable lining (1) according to claim 10, wherein each glue dot (13) is of a diameter of less than 700 m, in particular less than 300 m.

12. The sound-permeable lining (1) according to claim 10 or 11, wherein each glue dot (13) comprises a heat-activated adhesive material, in particular polyolefin, polyamides, polyesters or polyurethanes, or a pressure sensitive adhesive material, in particular rubbers or UV-acrylates.

13. The sound-permeable lining (1) according to claim 1 further comprising a third ply (15) which is arranged in between of the second ply (14) and the acoustic plasterboard (2) to which the sound-permeable lining (1) is to be applied, the third ply (15) being capable of forming a contact layer so as to increase the adhesive attachment of the sound-permeable lining (1) applied to the acoustic plasterboard (2).

14. An acoustic plasterboard (2) having applied thereto a sound-permeable lining (1) according to claim 1, the sound-permeable lining (1) being applied so that a single sound-permeable lining (1) covers perforations shaped in different acoustic plasterboards (2).

Description

[0024] Further advantageous aspects of the sound-permeable lining according to the invention become evident by the following detailed description of the specific embodiments with the aid of the drawings, in which:

[0025] FIG. 1 is a perspective view of an applied sound-permeable lining according to a first embodiment of the invention;

[0026] FIG. 2 is a side view of the sound-permeable lining in FIG. 1;

[0027] FIG. 3 is a detailed view of the sound-permeable lining in FIG. 2; and

[0028] FIG. 4 is a side view of a sound-permeable lining according to a second embodiment of the invention.

[0029] FIG. 1 shows a perspective view of an applied sound-permeable lining 1 according to a first embodiment of the invention. The first embodiment does not comprise a third ply so that the second ply 14 is directly applied to the acoustic plasterboard 2 (e.g. a Knauf Cleaneo plasterboard). The illustrated portion of acoustic plasterboard 2 is representative for any acoustic ceiling dry-wall construction comprising a plurality of adjacently mounted acoustic plasterboards 2 having a plurality of perforations 21 shaped therein. In such dry-wall constructions, acoustic plasterboard 2 is mounted via profiles at a predetermined distance to a raw ceiling by use of a hanger (e.g. Knauf Nonius Hnger). The sound-permeable lining 1 is applied to the mounted acoustic plasterboards 2 in the same manner as a wall paper.

[0030] Sound-permeable lining 1 comprises a first ply 12 of a spun bonded polyester fleece material and plastic (i.e. polyester) foil as second ply 14. Plastic foil 14 comprises a reflective surface 142 comprising deposited Aluminum and has a plurality of through-holes 141 formed therein. Each through-hole 141 has a diameter of 500 m. An adhesive layer 15 fixes plastic foil 14 to acoustic plaster board 2. The fleece 12 is attached to plastic foil 14 by a plurality of glue dots 13 in a printing step. Glue dots 13 are of a heat-activated material and have a diameter of 700 m. In general, glue dots 13 are arranged at locations on plastic foil 14 different from locations at which a through-hole 141 is formed. The fleece 12 is of a material having an areal density of 80 g/m.sup.2 and an opacity of 50%. The combination of the plastic foil 14 and the fleece 12 has an overall opacity O.sub.12 of about 95%. Lining 1 has an overall air flow resistivity R.sub.S12 of 300 Pas/m.

[0031] FIG. 2 and FIG. 3, which is an exaggerated view of FIG. 2, are side views onto the sound-permeable lining of FIG. 1. Sound-permeable lining 1 can be applied to the acoustic plasterboard 2 comparable to wallpaper. The overall opacity O.sub.12 allows hiding the perforations 21 shaped in acoustic plasterboard 2 so that they can not be seen from below by a human in a room in which the ceiling is formed. The overall air flow resistivity R.sub.S12 allows for good penetration of air as a medium for sound waves. In general, the sound absorption coefficient for a ceiling system made of acoustic plasterboard having applied thereto the sound-permeable lining have been determined to be in the range of .sub.w=50 to 80 (DIN EN ISO 11654). Acoustic plasterboard 2 has perforations 21 shaped therein which form through openings 21 through which the air as medium for the propagation of sound can penetrate the acoustic plasterboard. Attached from below is sound-permeable lining 1 having (from bottom to top) a fleece 12, and a perforated plastic foil 14 which are fixed to each other by a plurality of glue dots 13. The perforation comprises a plurality of through-holes 141 formed therein which allow for air as a medium for sound to penetrate the plastic foil 1. In general these through-holes 141 can be formed by a needle roller which is rolled along the surface so that the needles penetrate the plastic foil 12. The diameter of through-holes 141 is preferably so that the overall area of through-holes 141 is 5% to 20% of the plastic foil 12. According to another example (not shown) the through holes can be arranged (formed) pairwise.

[0032] FIG. 4 is a side view of a sound-permeable lining 1 according to a second embodiment of the invention according to which sound-permeable lining 1 further comprises a third ply 15. In the present example, the third ply is a further fleece 15 which can be fixed to acoustic plasterboard 2 and to which the perforated plastic foil 14 which forms the second ply is attached. The perforated plastic foil 14 is attached to the further fleece 15 by a further plurality of glue dots 13. Advantageously, the adhesive for fixing the third ply to the acoustic plasterboard can be applied over the entire upper surface of the further fleece 15.