acoustic element

Abstract

Acoustic element, in particular acoustic panel, comprising at least one wood-based panel (1) with a front (4) and a back (5), wherein the wood-based panel (1) is provided with recesses (2, 3, 6, 7, 9) which form openings on at least the front (4) of the wood-based panel (1), characterized in that the wood-based panel (1) consists of a particleboard.

Description

[0001] The present invention relates to a sound-absorbing acoustic element, in particular an acoustic panel, comprising at least one wood-based panel having a front side and a back side, wherein the wood-based panel is provided with recesses forming openings on at least the front side of the wood-based panel.

[0002] Acoustic panels made of wood-based panels are widely used in the interior design of buildings, as they enable a very economical production of acoustically effective units, particularly with the perforation of a previously full-surface carrier panel, offer a wide variety of surface designs, have a high level of inherent stability and allow for large surface units.

[0003] The common basis for such acoustic panels is a medium-density fiberboard (MDF) core board, which is manufactured in Germany and Europe according to DIN EN 622. Acoustic panels use core boards with a material thickness between 8 mm and 40 mm, usually 16 or 19 mm.

[0004] A generic acoustic panel based on MDF boards is described, for example, in DE 102 56 946 A1.

[0005] MDF boards are made from wood fibers and allow for highly customized processing. The (internal) contours created by drilling, sawing, and / or milling can produce relatively fine surfaces. This is one reason for the widespread use of MDF as deep-machined wood-based panels with generally visible internal surfaces, such as in the production of acoustic panels.

[0006] According to the evidence provided by wood-based panel manufacturers, coated MDF boards, as delivered as a fully untreated board, comply with the current limit values ​​for emissions of volatile organic compounds (VOCs) for use in buildings.

[0007] However, emissions measurements conducted by the applicant showed that acoustic panels made of MDF boards can exceed the applicable VOC limits after processing due to large openings in the interior surface, such as holes and slots, and thus no longer comply with the requirements of the AgBB scheme. Typical wood-based and / or added ingredients such as formaldehyde and acetic acid may be responsible, but above all, furfural, a substance that is likely formed from wood sugars during the heat treatment of the wood fibers and is classified as possibly carcinogenic.

[0008] One object of the invention is therefore to provide an acoustic element in which production-related emissions are reduced so that, in the ready-to-install state, the limit values ​​for emissions of volatile organic compounds (VOCs) are complied with in accordance with current criteria for safe indoor air quality in buildings.

[0009] The problem is solved by the features of claim 1. Advantageous embodiments can be found in the dependent claims.

[0010] In an acoustic element of the type mentioned above, the invention provides that the wood-based panel consists of a chipboard.

[0011] In its search for a suitable material for acoustic elements, the applicant discovered particleboard. This overcomes a prevalent prejudice among experts that considers particleboard unsuitable for large, deep-finished surfaces due to its poorer workability and coarser internal structure.

[0012] Unlike MDF, particleboard is not made of wood fibers, but of wood particles (chips) and a binding agent. To produce it, glued chips of various sizes are pressed into boards, sometimes in multiple layers.

[0013] In the case of surfaces that remain visible, such as slot joints, the applicant is aware that the coarser internal structure of chipboard requires higher quality processing tools compared to the processing of MDF boards, although these are currently available on the market.

[0014] Low-emission chipboards are preferably used as chipboards that fall below the limit values ​​of formaldehyde emission class E1 according to the EN 13986 standard and the requirements of the Chemicals Prohibition Ordinance (ChemVerbotsV).

[0015] In the applicant's tests, commercially available low-emission particleboards according to DIN EN 312, which meet the formaldehyde limits that have been effectively tightened since 2020 due to the new regulation of the test procedures, were treated for their acoustic effectiveness and subsequently subjected to emission measurements. No problematic furfural emissions were detected.

[0016] The acoustic panel, manufactured with a chipboard core, falls below the VOC limit values ​​of the Federal Environment Agency's assessment scheme developed by the Committee for the Health Assessment of Building Products (AgBB), thus meeting its requirements and even meeting the stricter limit values ​​of the Blue Angel DE-UZ 176 environmental label.

[0017] The visible surfaces of a chipboard acoustic panel can be coated with lacquer, melamine, laminates and wood veneers or covered with textiles, such as a contract fabric.

[0018] The acoustically effective recesses in the chipboard can be designed in the form of holes, slots, millings or combinations thereof, either as a continuous or with different machining on both sides.

[0019] Finally, the use of particleboard for the production of wood-based acoustic panels means that the advantage of complying with current emission limits outweighs minor optical limitations in the surfaces of the recesses.

[0020] Furthermore, the invention relates to an element-based wall system with a framework made of metallic profile beams and one or more acoustic elements of the type described above attached thereto.

[0021] Further advantages and features will become apparent from the following description of exemplary embodiments based on the figures. These show: Fig. 1a a front view of an acoustic panel in a first embodiment; Fig. 1b a view of the back of the acoustic panel from Fig. 1a; Fig. 1c a sectional drawing along section line II; Fig. 2a a front view of an acoustic panel in a second embodiment; Fig. 2b a view of the back of the acoustic panel Fig. 2a; Fig. 2c a sectional drawing along the section line II-II; Fig. 3a a front view of an acoustic panel in a third embodiment; Fig. 3b a view of the back of the acoustic panel from Fig. 3a; Fig. 3c a sectional drawing along the section line III-III; Fig. 4a a front view of an acoustic panel in a fourth embodiment; Fig. 4b a view of the back of the acoustic panel Fig. 4a and Fig. 4c a sectional drawing along section line IV-IV.

[0022] The Fig. The first sample shown in Figures 1a to 1c shows a sound-absorbing acoustic panel. It consists of a low-emission chipboard 1 with front-facing slits and rear-facing perforations, whose inner intersection creates an open cross-section crucial for acoustic effectiveness. The slits on the front 4 consist of longitudinal grooves or slots 2 milled or sawn at regular intervals. The perforations on the rear 5 consist of blind holes 3 arranged in rows. The rows 3 and the longitudinal grooves 2 correspond to each other, so that they overlap within the acoustic panel, creating through openings in some areas. Fig. In Figure 1c, the dashed line 2a indicates the depth of the longitudinal groove 2 hidden in the section, so that the overlap area of ​​the longitudinal grooves 2 and the blind holes 3 becomes clear.

[0023] The chipboard 1 consists, in a conventional manner, of wood chips of different sizes, which are pressed into a board in several layers using a binding agent.

[0024] The front side 4 is optionally covered with melamine paper, laminate, wood veneer, or lacquer. The back side 5 is optionally covered with an acoustic fleece.

[0025] Dimensional variations in joint width, joint spacing, hole diameters and hole spacing offer design and technical variation options.

[0026] The Fig. The second sample shown in Figures 2a to 2c differs from the first sample by having slits on the back instead of perforations, thus providing a technical manufacturing alternative with otherwise similar properties. Unlike on the front, the slits on the back do not consist of continuous longitudinal grooves 2, but rather of several shorter slits or grooves 6 spaced longitudinally. The grooves 6 correspond to the front longitudinal grooves 2, resulting in partially continuous openings. The dashed line 2a in Figure 2a Fig. 1c again shows the depth of the longitudinal groove 2 hidden in the section, so that the overlap area of ​​longitudinal grooves 2 and grooves 6 becomes clear.

[0027] The Fig. The third sample, shown in Figures 3a to 3c, shows an acoustic panel 1 with through holes 7, which can be manufactured either on two sides or on one side. The surface and dimension variations are similar to those of the first sample. Additionally, the acoustic panel can be covered with textiles, such as a selected fabric 8, which visually conceals the perforations and, depending on the material, can even have a positive effect on the acoustic properties.

[0028] The Fig.The fourth sample shown in Figures 4a to 4c differs from the first sample by its continuous slits consisting of several longitudinally spaced short slots or grooves 8, which extend from the front side 4 to the back side 5. The slots 8 can be produced either continuously on two sides or continuously on one side. As with the third sample, the acoustic panel can additionally be covered with textiles, such as a selected fabric 8, which visually conceals the slits. The fourth sample represents another technical manufacturing alternative to the previous samples with otherwise similar properties.

[0029] According to the invention, the acoustic panels shown serve as paneling for partition walls and wall cladding, in particular so-called system partition walls, which are constructed from a substructure of profile beams and acoustic panels attached to them. QUOTES CONTAINED IN THE DESCRIPTION

[0000] This list of documents submitted by the applicant was generated automatically and is included solely for the convenience of the reader. This list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions. Cited patent literature

[0000] DE 102 56 946 A1

[0004]

Claims

[1] Acoustic element, in particular acoustic panel, comprising at least one wood-based panel (1) with a front side (4) and a back side (5), wherein the wood-based panel (1) is provided with recesses (2, 3, 6, 7, 9) which form openings on at least the front side (4) of the wood-based panel (1), characterized by that the wood-based panel (1) consists of a chipboard. [2] Acoustic element according to claim 1, wherein the chipboard (1) is a chipboard according to standard EN 312. [3] Acoustic element according to claim 1 or 2, in which an acoustic effectiveness is obtained by recesses (2, 3, 6, 7, 9) of a previously full-surface plate. [4] Acoustic element according to one of the preceding claims, in which the recesses (2, 3, 6, 7, 9) are formed on the front side (4), on the front side (4) and the back side (5) or continuously from the front side (4) to the back side (5). [5] Acoustic element according to one of the preceding claims, wherein the recesses (2, 3, 6, 7, 9) in the surface of the plate (1) have round or linear shapes or a combination of round and linear shapes. [6] Acoustic element according to one of the preceding claims, in which the recesses (2, 3, 6, 7, 9) are formed by drilling, milling or sawing. [7] Acoustic element according to one of the preceding claims, in which the front side (4) and / or the back side (5) are provided with a coating. [8] Acoustic element according to claim 7, wherein the coatings consist of a lacquer, a melamine resin paper, a laminate, a wood veneer, a plastic, a metal, a textile covering (8) or a nonwoven covering. [9] Acoustic element according to claim 7 or 8, wherein the coatings are applied before or after the recesses (2, 3, 6, 7, 9) are made. [10] Acoustic element according to one of the preceding claims, in which the front edges are coated or covered with a material according to claim 8 without coating or matching the surface. [11] Acoustic element according to one of the preceding claims, in which the chipboard is a low-emission chipboard, in particular a low-emission chipboard which falls below the limit values of formaldehyde emission class E1 according to standard EN 13986 and the requirements of the Chemicals Prohibition Ordinance (ChemVerbotsV). [12] Acoustic element according to one of the preceding claims, which complies with the limit values for emissions of volatile organic compounds in accordance with the requirements for indoor air quality according to the AgBB assessment scheme 2024. [13] Acoustic element according to one of the preceding claims, in which the recesses (2, 3, 6, 7, 9) are formed on the front side (4) and the back side (5), which at least partially correspond to each other, so that they are formed as through openings in some areas within the acoustic element. [14] Acoustic element according to one of the preceding claims for installation in an elemented wall system. [15] Elemental wall system with a substructure made of metallic profile beams and one or more acoustic elements attached thereto according to one of the preceding claims.

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