CN207156595U - A kind of broadband sound absorption structure Wood composite flitch - Google Patents

Abstract

The utility model discloses a kind of broadband sound absorption structure Wood composite flitch, including wood wool board, honeycomb sandwich layer, papery thin layer and the wood moulding cavity plate set gradually；Wood wool board is provided with multiple holes；Honeycomb sandwich layer is provided with multiple honeycomb chambers in honeycomb arrangement；Wood moulding cavity plate is provided with cavity towards the side of papery thin layer, and the mineral wool for fitting in cavity bottom is provided with cavity.Wood composite flitch with the sound absorption structure, there is significant noise reduction for high-frequency noise and Middle and low frequency noise, the frequency range that absorbs sound is wider.

Description

A broadband sound-absorbing structure wood composite material board

technical field

The utility model relates to the technical field of wooden composite materials, in particular to a wooden composite material board with a broadband sound-absorbing structure.

Background technique

Sound-absorbing materials are materials that can absorb sound energy and reduce environmental noise. Whether it is to control reverberation time, reduce noise, improve sound diffusion, or eliminate sound quality defects, it is necessary to use sound-absorbing materials to study the acoustic performance of sound-absorbing structures. It has important practical significance for architectural acoustics and noise control. In the field of building decoration technology, wood composite materials with sound-absorbing structures are a kind of building decoration materials widely required in various occasions such as office or residence.

At present, most of the wood composite panels with sound-absorbing structures known to the public have relatively high sound-absorbing coefficients in a certain frequency band. Generally, porous materials mainly absorb noise above 500Hz, but the low-frequency noise reduction effect is relatively poor. For example, in the prior art, there is a micro-perforated plate structure with micro-holes in the middle. The thickness of the ordinary plate is selected to be 1-500mm, and the micro-holes are pierced with millimeters to prepare a micro-perforated plate. The fiber filaments, the fiber diameter ranges from 1-100 microns, and the fiber penetration rate is 1-100%. The wooden sound-absorbing structure of this micro-perforated plate structure has a sound absorption coefficient of more than 0.5 for the noise in the frequency range of the lower limit frequency of 436Hz, the upper limit frequency of 1538Hz, and the width of 1102Hz. The sound effect is poor.

To sum up, the wooden composite sound-absorbing materials in the prior art have the technical problems of narrow sound-absorbing frequency range and insignificant full-frequency noise reduction effect.

Utility model content

The purpose of the utility model is to provide a wide-band sound-absorbing structure wooden composite material board to solve the technical problems in the prior art that the sound-absorbing frequency range is narrow and the full-frequency noise reduction effect is not significant.

In order to achieve the above object, the utility model provides the following scheme:

A wide-band sound-absorbing structural wooden composite material board, including a wood wool board, a honeycomb core layer, a paper thin layer and a wood-plastic cavity board arranged in sequence;

The wood wool board is provided with a plurality of holes;

The honeycomb core layer is provided with a plurality of honeycomb cavities arranged in a honeycomb shape;

A cavity is provided on the side of the wood-plastic cavity panel facing the paper thin layer, and glass wool attached to the bottom of the cavity is provided in the cavity.

Preferably, the wood wool board has a thickness of 3-9mm and a density of 130kg/m ³ -215kg/m ³ .

Preferably, the perforation rate of the wood wool board is 9%, the hole distance is 10mm, and the hole diameter is 6mm.

Preferably, the honeycomb core layer is a honeycomb core layer made of cardboard, and the layer thickness is 10-30mm.

Preferably, the stiffness of the honeycomb core layer is 1000-1500 g·cm, and the grammage is 600-700 g/m ² .

Preferably, the honeycomb cavity has a depth of 10-30mm.

Preferably, the depth of the cavity on the wood-plastic cavity plate is 10-30mm.

Preferably, the wood wool board has a thickness of 9 mm and a density of 215 kg/m ³ , the depth of the honeycomb cavity is 30 mm, and the cavity depth of the wood-plastic cavity board is 30 mm.

Preferably, the wood-plastic cavity board is provided with mortise and tenon for mortise and tenon connection.

According to the specific embodiment provided by the utility model, the utility model discloses the following technical effects:

The wooden composite board with broadband sound-absorbing structure provided by the utility model discloses a brand-new sound-absorbing structure, which includes a wood wool board with a porous structure, a honeycomb core board with a multi-cavity structure, and paper The combination of various layered structures forms a complete sound-absorbing structure, and the combination of wood wool board and honeycomb core layer is equivalent to forming a Helmholtz resonance sound-absorbing structure. The multiple honeycomb cavities of the honeycomb core board are the front cavities, and the cavities on the wood-plastic cavity board are the large rear cavities. The setting of the rear cavities can friction and block the sound It can be converted into heat energy. At the same time, multiple honeycomb front cavities are combined with a wood-plastic back cavity to form a front-rear cavity resonance sound-absorbing structure, which increases the effective thickness of the surface material. In addition, the gap between the wood-plastic cavity board and the honeycomb core layer The vibration of the paper thin layer further dissipates low-frequency noise. According to the test, the utility model is composed of wood wool board, honeycomb core board, paper thin layer and wood-plastic cavity. Both noise and low-frequency noise have good noise reduction effects.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the accompanying drawings required in the embodiments will be briefly introduced below. Obviously, the accompanying drawings in the following description are only the present invention. For some embodiments of the invention, those skilled in the art can also obtain other drawings according to these drawings without paying creative efforts.

Fig. 1 is a structural schematic diagram of a wood composite board with a broadband sound-absorbing structure provided by an embodiment of the present invention.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. example. Based on the embodiments of the present utility model, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of the present utility model.

In order to make the technical solution of the utility model more obvious and easy to understand, the utility model will be further described in detail below in conjunction with the specific embodiments.

Embodiment one

Referring to Fig. 1, a wide-band sound-absorbing structure wooden composite material panel provided by Embodiment 1 of the present utility model includes a wood wool board 1, a honeycomb core layer 2, a paper thin layer 3 and a wood-plastic cavity arranged in sequence plate 4.

Among them, the wood wool board 1 is provided with a plurality of holes 11; the honeycomb core layer 2 is a honeycomb board structure, which is composed of a plurality of honeycomb cavities 21 with a certain depth, and the plurality of honeycomb cavities 21 are arranged in a honeycomb shape; the wood-plastic cavity board 4 A cavity 41 is provided on the side facing the paper thin layer 3, and glass wool (not shown in FIG. 1 ) attached to the bottom of the cavity is provided in the cavity 41 .

The wood wool board 1 may have a thickness of 3-9mm and a density of 130kg/m ³ -215kg/m ³ .

In the first embodiment, as a possible implementation manner, the wood wool board 1 has a thickness of 3 mm and a density of 130 kg/m ³ .

Wood wool board 1 is a typical porous sound-absorbing material. In addition to good sound-absorbing effect, it is light in weight, has good mechanical properties in tensile and impact resistance, and is also convenient for transportation.

The honeycomb core layer 2 is a honeycomb core layer made of cardboard, and the layer thickness is 10-30mm. The stiffness of the honeycomb core layer 2 is 1000-1500g·cm, and the grammage is 600-700g/m ² . Preferably, as an implementable manner, in Embodiment 1 of the present utility model, the layer thickness of the honeycomb core layer is 10mm.

Most of the raw materials of the honeycomb core layer 2 are kraft paper or similar paper materials, which are glued together to obtain a hexagonal paper core, which can be impregnated with glue to increase its strength and resemble a honeycomb. This kind of hollow material has the advantages of light weight, high strength-to-weight ratio, etc., and can play the role of cushioning and sound insulation at the same time.

The preset depth of the honeycomb cavity 21 is 10-30mm, and the depth of the cavity on the wood-plastic cavity plate is 10-30mm. Preferably, in Embodiment 1 of the present utility model, the depth of the honeycomb cavity is 10mm, and the depth of the cavity 41 on the wood-plastic cavity plate is 10mm. The cavity on the wood-plastic cavity plate is preferably one large cavity, and can also be multiple. The specific size of the cavity and the specific number of cavities provided on each plate can be determined by those skilled in the art according to the actual plate size and load-bearing capacity. It needs to be determined, and the utility model does not enumerate them one by one.

In the embodiment of the present utility model, the material of the thin paper layer 3 may be kraft paper or kraft cardboard, with a thickness of 0.5mm-2mm.

In the embodiment of the utility model, the material used for the wood-plastic cavity board is a composite material obtained by compounding fiber or powdery wood material or plant fiber and thermoplastic plastic. Its remarkable advantage is to overcome the existing shortcomings of wood materials by adding plastics. For example, plastics have good moisture-proof performance, which overcomes the disadvantages of pure solid wood that is not moisture-proof, easy to rot, easy to crack, warp, and aging. In addition, wood-plastic materials can be recycled and are environmentally friendly materials, and wood-plastic materials are different from wood-based panels that need to be glued to connect, avoiding the formaldehyde produced by the use of phenolic and urea-formaldehyde glue, which is more beneficial to human health and is an environmentally friendly material. However, the untreated wood-plastic itself has poor sound absorption effect, and the common wood-plastic sound-absorbing materials on the market are mostly made of sound-absorbing panels in the form of openings.

Embodiment 1 of the utility model provides a wooden composite material board with a brand-new sound-absorbing structure, wherein the cavity design of the wood-plastic cavity board can convert sound energy into heat energy through friction and retardation, and the Glass wool is a porous material, which can reduce high-frequency noise. The wood wool board and the honeycomb core layer form a Helmholtz resonance sound-absorbing structure. , and the thin paper layer in the middle dissipates low-frequency noise through vibration. The sound-absorbing structure composed of the above-mentioned layers can have a better noise reduction effect on high-frequency noise and medium-low frequency noise through a unique structural design, and the sound-absorbing frequency band is wider.

Embodiment two

In the second embodiment of the utility model, the thickness of the wood wool board is 6 mm, the density is 187 kg/m ³ , the thickness of the honeycomb core layer is 20 mm, and the cavity depth of the bottom wood-plastic cavity board is 20 mm. Other structural parameters are the same as those in Embodiment 1, and will not be repeated here.

Embodiment three

Embodiment 3 of the present utility model is a preferred embodiment. In Embodiment 3, the optimal combination parameters of the sound-absorbing structure are wood wool board thickness 9mm, density 215kg/m ³ , and wood wool board perforation rate 9% , the hole distance is 10mm, and the hole diameter is 6mm. The depth of the honeycomb front cavity of the honeycomb core layer is 30mm, and the depth of the cavity (back cavity) on the wood-plastic cavity plate is 30mm. Other structural parameters are the same as those in Embodiment 1, and will not be repeated.

In the third embodiment of the present utility model, as shown in FIG. 1 , the wood-plastic cavity board is provided with a mortise and a mortise for tenon-tenon connection.

In the actual construction project of the prior art, in order to achieve a suitable acoustic effect, a cavity is left behind the sound-absorbing body, but the realization of the cavity in the existing sound-absorbing design depends on the splicing of light steel keels, which means During the installation, it is necessary to complete the fixing of multiple connection points among the keel frame, the wall, and the sound-absorbing material. The cumbersome installation is time-consuming and labor-intensive. At the same time, due to the dead weight and length of the dragon frame, it is also inconvenient to carry during transportation. Therefore, considering the economic cost, the sound-absorbing structure design in the prior art, besides the price of the sound-absorbing material itself, also has high additional costs during installation and transportation. The sound-absorbing structure provided by the utility model, the tenon-tenon connection between the wood-plastic cavity boards does not require light steel keels, so the sound-absorbing structure of the utility model can satisfy the structural strength and can replace the light-weight material of the metal keel at the same time. The installation process is convenient and quick, which greatly reduces the installation cost.

The wooden composite material board with broadband sound-absorbing structure provided by the utility model further optimizes the full-frequency sound-absorbing effect of multi-layer sound-absorbing materials. Wood-plastic cavity layer, wood-plastic can further enhance the mechanical properties while ensuring the effect of the back cavity, and provide convenience for opening tenons and fixing connectors during installation. A thin layer of paper is added between the honeycomb and wood-plastic to obtain a four-layer composite sound-absorbing material. By designing the four structural parameters of wood wool board thickness and density, honeycomb thickness, and wood-plastic cavity depth, the influence of different structural parameters on the sound absorption effect is analyzed, and the relevant process parameters and the optimum sound absorption effect that can achieve full-frequency sound absorption are obtained. Excellent process parameters, the relevant process parameters disclosed above can achieve a good broadband sound absorption effect, which solves the problem of poor noise reduction effect at low and medium frequencies in the prior art, and the lack of suitable full-frequency and high-noise reduction sound-absorbing bodies technical problems.

Specifically, through experimental testing, see Table 1 for the test results of the sound absorption coefficient of the sound-absorbing material provided by the technical solution of the present invention, wherein 1-3 are three groups of test samples of the sound-absorbing material of the present invention, as can be seen from Table 1, this The sound absorption structure provided by the utility model has an average sound absorption coefficient of 0.673 in a wide frequency band of 125Hz-2000Hz, and the sound absorption effect is good. Table 2 shows the test results of the sound absorption coefficient of common sound-absorbing materials in the prior art, and the sound absorption coefficient can only reach 0.326.

Table 1

Table 2

In this paper, specific examples have been used to illustrate the principle and implementation of the present utility model, and the description of the above embodiments is only used to help understand the method of the present utility model and its core idea; meanwhile, for those of ordinary skill in the art, according to Thoughts of the present utility model all have changes in specific implementation and scope of application. To sum up, the contents of this specification should not be understood as limiting the utility model.

Claims (9)

1. A wide-band sound-absorbing structure wooden composite material board, is characterized in that, comprises wood wool board, honeycomb core layer, paper thin layer and wood-plastic cavity board arranged in sequence; The wood wool board is provided with a plurality of holes; The honeycomb core layer is a honeycomb plate structure, which is provided with a plurality of honeycomb cavities arranged in a honeycomb shape and having a preset depth; A cavity is provided on the side of the wood-plastic cavity panel facing the paper thin layer, and glass wool attached to the bottom of the cavity is provided in the cavity. 2. The wide-band sound-absorbing structure wood composite material board according to claim 1, characterized in that, the wood wool board has a thickness of 3-9 mm and a density of 130 kg/m ³ -215 kg/m ³ . 3. The wide-band sound-absorbing structure wood composite board as claimed in claim 2, wherein the perforation rate of the wood wool board is 9%, the hole distance is 10mm, and the hole diameter is 6mm. 4. The wide-band sound-absorbing structure wood composite material board according to claim 1, characterized in that, the honeycomb core layer is a honeycomb core layer made of cardboard, and the thickness of the layer is 10-30mm. 5. The wide-band sound-absorbing structure wood composite material board according to claim 4, characterized in that, the stiffness of the honeycomb core layer is 1000-1500 g·cm, and the grammage is 600-700 g/m ² . 6. The wide-band sound-absorbing structure wood composite material board according to claim 1, characterized in that, the preset depth of the honeycomb cavity is 10-30mm. 7. The wide-band sound-absorbing structure wood composite material board according to claim 1, characterized in that, the depth of the cavity on the wood-plastic cavity board is 10-30mm. 8. The wide-band sound-absorbing structure wood composite material board according to claim 7, characterized in that, the wood wool board has a thickness of 9mm and a density of 215kg/m ³ , the depth of the honeycomb cavity is 30mm, and the wood-plastic The cavity depth on the cavity plate is 30mm. 9. The wide-band sound-absorbing structure wood composite material board according to any one of claims 1-8, characterized in that, the wood-plastic cavity board is provided with mortise and tenon for mortise and tenon connection.