FI66961B - LJUDISOLERANDE SKILJEVAEGGSELEMENT - Google Patents

Description

This invention relates to a sound-insulating partition element for the production of sound-crossing partitions and comprising a 5-layer structure consisting of two outer cladding panels and a core plate, which is a sound-insulating material consisting of mineral wool with interconnected mineral fibers, optionally combined in the form of lamellae, in which the core plate is formed with a hollow cavity covering the main part of the surface area of the plate, except for a narrow area along at least two edges of the element.

Layered bulkhead elements are included in bulkheads, especially movable ones used in container-15 gratings, train carriage bulkheads, and ship bulkheads or bulkheads. To save space, partitions and bulkhead elements must be thin while being rigid and have a high sound attenuation. The most commonly used elements consist of two outer cladding plates, the space between which is filled with a core plate, which is preferably a porous material. The porous material may be mineral wool, e.g. glass, stone or moss wool, having a bulk density of about 50 kg / m 2 or more and a binder content of at least about 0.5% by weight. 25 Partitions and bulkheads constructed of these elements in a suitable size, eg 600 x 2400 mm and 50 mm thick, have a satisfactory rigidity, but their sound-attenuation figures are unsatisfactorily low. Therefore, it has previously been proposed to assemble a core plate from two 30 core layers which are a porous material. The core layers are held together by spacers and the cladding panels are attached to the outer sides of the core panels. Due to the spacers, a cavity is formed, i.e. an air gap between the layers of the heart. The cavity, or air gap, improves the sound attenuation number, but the stiffness of the gestures is too low because the core layers poorly transfer compressive and shear forces between the cladding panels.

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It is an object of the present invention to provide an element of the above type having a high rigidity and a higher sound attenuation number compared to known layer-type elements having a corresponding thickness. According to the invention, this is achieved by gluing to the opposite surfaces of the core plate cavity a thin layer of a high tensile material, preferably glass cloth, paper or aluminum foil. This results in a considerably stiffer element, since the overlaid layer can receive tensile forces. At the same time, a higher sound attenuation number and a substantial attenuation of the resonant frequencies of the elements are thus obtained. The reinforcing layer may be a metal film, e.g. an aluminum plate, which improves the fire resistance of the element, which is important when the element is used in a ship. In addition, the temperature 15 remains low on the side of the element that is away from a possible fire. By using fiberglass fabric, a more fire-resistant element is obtained at the same time, while the gluing of the core layers is easier. By using mineral wool lamellae in two core layers, a higher sound attenuation number is achieved at the upper resonant frequency of the element than when the core layers are mineral wool sheets.

The invention will be described in more detail with reference to the drawing, in which Figure 1 shows a partition element according to the invention, Figures 2 and 3 show sound attenuation measurements with a known partition element, and Figures 4 to 9 show sound attenuation measurements with elements according to the invention.

Figure 1 shows an example of an element according to the invention. A core layer 2 is glued on the cladding panels 1. The core layers 2 can be, for example, binder-containing mineral wool with a bulk density of about 150 kg / cm 3 and a binder content of about 1% by weight. Between the cladding panels 1 along two opposite sides are placed strips 3 66961 3, which may have a notch 4, 15 x 15 mm. The cladding panels 1 are glued or attached to the slats 3 in another known manner. The slats can be metal profiles, wooden slats or mineral wool impregnated with a binder, e.g.

5 with phenolic resin or water glass. The thickness of the strips 3 is greater than the total thickness of the core layers 2, so that a cavity or air gap 5 is formed between the layers 2. The size of the strips 3 can be 47.4 x 47.4 mm and the thickness of the layers 2 can be 22 mm. The cladding panels 1 can be steel panels with a thickness of 0.7 mm. They can also be plastic or wood.

If the core layers 2 are binder-containing mineral wool, they can be sheets in which the direction of the fibers is preferably parallel to the surfaces of the cladding sheets 1. The core layers 2 can also be made of binder-containing mineral-15 livilla lamellae, so that the direction of the fibers is preferably perpendicular to the surfaces of the sheets 1. The lamellae can be arranged vertically or horizontally. At the top and / or bottom of the element, the cavity 5 can be closed with mineral wool. The reinforcing layer 6, which may be a paper, a plastic film, a metal plate or a fiberglass fabric, is also glued on the surfaces facing the cavity 5 to the core layers 2 facing the cavity 5.

Figures 2 to 9 show the results of sound attenuation measurements made with walls constructed of elements in accordance with DS / ISO / R140 and DS / ISO / 25 R717.

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The area of the test walls is about 10.4 m. Figure 2 shows the result in dB of sound attenuation number measurements made with a wall constructed of known elements with a cavity 5. Figure 3 shows the results in the form of a curve 30. The cladding panels 1 are 0.7 m steel panels glued to the slats 3, 47.4 x 47.4 mm x 2400 mm, which are laminated, binder-containing mineral wool, with a bulk density of about 300 kg / m 3. The core panels 2, which consist of mineral wool lamellas, have a bulk density of about 150 kg / m 3 and a thickness of about 22 mm, which gives a cavity of about 2 mm. The individual elements were assembled using 15 x 30 x 1.5 mm steel tubes at notch points 4. According to Lab- 4 66961, Lab I = 40 dB, negative deviations a

sum = 11 dB and Rm = 39.3 dB. At a resonant frequency of 125 Hz, R = 15.8 dB. Figures 4 and 5 show similar measurement results as Figure 2 and resp, Figure 3 for the corresponding wall 5, but glued on top of the core layers 2 according to the invention from rutex glass fabric on surfaces facing inwards towards the cavity 5. According to the measurements Lab I = 44 dB and negative sum of deviations = 23 dB

a and Rm = 40.1 dB. At a resonant frequency of 125 Hz R = 22.8 dB. Figures 6 and 7 show similar measurement results as Figures 4 and 5 for the same wall, but with the rutex glass fabric replaced by a 0.05 mm aluminum plate. According to the measurements, Lab I = 44 dB and the sum of negative deviations = 24 dB and Rm = 40.3 dB. At a resonant frequency of 125 Hz R = 23 dB.

Figures 8 and 9 show similar results as Figures 4 and 5 with the same wall, but in which the mineral wool lamellas in the core layers 2 have been replaced by mineral wool sheets having the same bulk density. According to the measurements, Lab I = 41 dB, sum of negative deviations = 23 dB and Rm = 20 38.2 dB. At resonant frequencies of 125 and 630 Hz, R = 21.2 of this wall and resp. 36.5 dB.

The measurements clearly show that the wall constructed according to the invention considerably improves the sound attenuation numbers at the resonant frequencies of the elements compared to a wall made of 25 known elements and improves the Lab I value. In addition, the elements of the invention are more rigid than known elements.