KR200470245Y1 - Composite sound-absorbing materials made from wood wool board - Google Patents

Abstract

The present invention relates to a wood wool board composite sound absorbing material comprising a wood wool board porous sound absorbing material made of wood fibers, a polypropylene microfiber sound absorbing material bonded to one side of the sound absorbing material, and a synthetic resin sheet bonded to the microfiber sound absorbing material. As a result, the composite sound absorbing material of the present invention improves porosity for sound insulation (absorption), prevents dust adsorption, etc. while blocking air flow with the wall surface, and additionally obtains easy workability.

Description

Composite sound-absorbing materials made from wood wool board}

The present invention relates to a wood wool board composite sound absorbing material, and more particularly to a composite sound absorbing material to improve the sound absorbing performance and workability by attaching a microfiber sound absorbing material and a synthetic resin sheet on one side of the wood wool board sound absorbing material.

With the development of the industry, the use of various industrial machines generates unnecessary noise to humans, and the noise and the degree of damage between the floors of apartments, which are living spaces of modern people, are gradually increasing. To solve this noise problem, various noise prevention measures have been proposed.

Various sound absorbing materials have been used as a countermeasure against such noise, and the principle of the sound absorbing material is that there are pores inside or paths through which air can pass, so sound energy is converted into thermal energy while passing through these pores or paths, and sound pressure falls. . Types of sound absorbing materials include pores inside such as sponges, polyester composite sound absorbing materials (also known as 'art boards'), and microfiber fiber sound absorbing materials.They are formed by compressing fibers such as rock wool, glass fiber, wood, etc. And metal plate materials made of MDF and aluminum.

The polyester composite sound absorbing material is well described in the "high density polyester composite sound absorbing material and its manufacturing apparatus" that the inventor devised in 2006 and registered in 2008 registration No. 20-0440716. Here, it is based on a polyester sound absorbing material produced by combining a high melting point polyester having a melting point in the range of 260 to 270 ° C. and a low melting point polyester having a melting point of 110 ° C. or lower, and having a density of 150 Kg / m 3 to 350 Kg / The high-density polyester composite sound absorbing material comprising a porous sound absorbing material of m3 and a synthetic resin sheet adhered to one side of the sound absorbing material, thereby absorbing dust by obtaining an effect of blocking air flow with the wall surface while maintaining porosity for sound insulation (absorption). The phenomenon is prevented.

In addition, the microfiber sound absorbing material to be examined in the present invention is a melt blown type sound absorbing material produced by melting a polypropylene chip and injecting it through a nozzle to make a very fine diameter fiber with ultra-fast wind and attaching a cover to both sides to roll it. The size of the sound absorbing material is determined by the weight of the sound absorbing material per square meter, which is proportional to the thickness of the sound absorbing material. Microfiber sound absorbers are manufactured by US 3M's 'Sinsulat', while domestic products are sold under the brand name 'WebSchler'.

On the other hand, the wood wool board (wood wool cement board or wood wool board) to be examined in the present invention after cutting the log to about 50cm, processed into fibers of width 1 ~ 3mm, thickness 0.1 ~ 0.5mm and then molded into cement It is a compression type sound absorbing material. Wood boards using wood and excellent properties of cement have been used for interior and exterior materials and sound absorbing materials in Europe and the United States for a long time, and have been making efforts to improve cement components, manufacturing facilities, and physical properties. The standardization of the product has been made, such as.

The wood wool board can be applied directly on the neck because of its high mechanical strength, unlike the fibrous sound absorbing material that is flexible and must be applied to the plywood or gypsum board wall. In such a construction, the air layer on the back side of the wood wool board may increase the sound absorption performance, and thus the sound absorption rate increase effect may be obtained, since the sound absorption performance of the wood wool board is relatively lower than that of the polyester composite sound absorbing material (art board) described above. In the case of ceiling construction, a technique of covering fiberglass or rock wool on a wooden board to increase the sound absorption rate is known. On the other hand, the wood wool board has a cement component of the material, so the fire resistance is high, so it is suitable for the field of using sound-absorbing material of flame retardant grade 2 such as gymnasium, auditorium, theater and church.

The disadvantage of the wood board is that the sound absorbing material is high in weight. Since the weight ratio per sound absorption rate of the wood wool board is 4 times higher than the art board, the wood wool board becomes excessively heavy to increase the sound absorption rate, so it is difficult to use more than 25T as a sound absorbing material. Table 1 shows the weights of the woodboard and artboard.

Specific gravity (Kg / m3) Weight (Kg / m2) Sound Absorption Rate (NRC,%) Weight / absorption rate Wood board-15T 527 7.9 0.28 28.2 Artboard-9T 258 2.3 0.30 7.6

Breathable pollution is a fatal problem of sound absorbing material in which pores exist. Wood wool boards are coarse wood fibers and the volume of pores in comparison with the fibers, the breathable pollution does not appear clearly because it does not appear seriously, if you look closely, you can see the color change caused by breathable pollution. The rear air layer can be used to increase the sound absorbing power of the wood board. In this case, the air pollution of the wood board is inevitable. The breathable fouling phenomenon is introduced in detail in the design of the above-mentioned Utility Model Registration No. 20-0440716, which is separately filed by the present inventors.

The wood-board sound absorbing material used in the present invention may be abbreviated as 'wood-board' in the art, and is manufactured in a plate shape and is commonly referred to as a wood-board sound absorbing board, and thus, the present invention will be used interchangeably.

There are two ways to increase the sound absorption performance of wood board. A common method is to increase the thickness of the wood board. In this case, however, the weight of the board is heavy at the same time. In the case of 600x1200mm 25T wood board, the weight of one sound absorbing plate is about 10kg. If this thickness is too thick, it is difficult for the worker to handle alone, and it has been difficult to attach to the wall or ceiling of 7-8m height.

Another method of increasing the sound absorbing performance is to use the sound absorbing performance synergistic effect by the rear air layer of the sound absorbing plate. This method is the most representative method of raising the sound absorbing force, but the occurrence of breathable pollution caused by air holes is inevitable. As a method of preventing breathable pollution, it may be considered to simply attach the synthetic resin sheet to the backside of the wood board, through which air flow may be blocked to prevent contamination of the wood board.

As such, the method of attaching the synthetic resin sheet to the back side of the particular sound absorbing material to solve the air-contamination pollution is suitable for the flexible and elastic high density polyester sound absorbing material as in the preliminary registration of the present inventors, but the coarse wood fibers are loosely pressed. On rigid boards, the back side of the vinyl resin can be easily damaged.

Particularly, if the synthetic resin sheet is attached to the back of the wood wool board, and the wood wool composite board is stacked and stacked, there is a synthetic resin sheet between the wood wool board and the wood wool board. At this time, when the sound absorbing material is rubbed or rubbed with each other, there is a risk of damage to the plastic sheet. have.

Therefore, the present invention is intended to provide a wood-based composite sound absorbing material having excellent pollution prevention function, which solves the air-contaminated fouling phenomenon of the wood wool board, and at the same time solves the airborne pollution phenomenon of the wood wool board, which is not disadvantageous in terms of sound absorption performance or construction properties.

The technical problem of the present invention is made of wood fibers, the wood wool board porous sound absorbing material having a thickness of 50mm or less, a polypropylene microfiber microfiber sound absorbing material adhered to one side of the sound absorbing material and a thickness of 20mm or less, and a synthetic resin sheet bonded to the microfiber sound absorbing material in order It can be achieved by wood-board composite sound absorbing material.

As another embodiment of the present invention, the synthetic resin sheet in the present invention is preferably commercially available vinyl chloride, PET or oriented polypropylene (OPP).

In addition, as another aspect of the present invention, there is provided a wood-board composite sound absorbing material printed with various patterns that can give an advertising effect on the outer surface of the sheet.

The wood board used in the present invention can be commercially available, but as can be seen in Table 1, the sound absorption rate of the wood board is similar to the polyester composite sound absorbing material, but considering the thickness effect of the wood board sound absorption It can be seen that this is low. Wood wool board has a relatively high sound absorption at low frequencies and a relatively low frequency at high frequencies compared to polyester composite sound absorbers. This is due to the greater thickness of the wood fibers constituting the wood wool board than the polyester fibers.

Although wood boards do not have low sound absorption, they need to be directly attached to the wood board for high sound absorption for design purposes. As shown in Table 2, the sound absorption coefficient expressed in NRC is significantly increased to 0.49 when the rear air layer has 30 mm at the rear board of 15 mm 0.28. However, it is inevitable that air pollution is generated on the surface of the wood board at the moment of using the back air layer. Many black spots on the surface of wood board after many years of construction result in breathable pollution on the shadow of wood fibers. Therefore, the main purpose of the present invention is to find a method that can solve the breathable pollution of the wood board, while increasing the sound absorption rate of the wood board.

In order to improve the sound absorption rate of the wood board, it may be considered to attach another sound absorbing material to the back of the wood board. For example, many designs and inventions using rock wool, glass fiber, and other polyester sound absorbing materials to increase the sound absorption and sound insulation of a space have been proposed. However, since the thickness of these sound absorbing materials is 25 to 100mm, they are pressed like cotton so as to reduce the thickness of the sound absorbing materials, so they cannot be directly attached to the wood wool board, and these sound absorbing materials are put in advance before the wood wool board is installed on the wood. It is common to give wooden boards. In particular, by attaching the high-density polyester composite sound absorbing material, which is the design of the Utility Model Registration No. 20-0440716, which is the prior art of the designer, on the back of the wood board, it is possible to achieve a sound absorption and prevention of breathable pollution. However, this method can increase the sound absorbing power of the wood board, but there is a disadvantage in workability because the thickness of the sound absorbing material is increased by more than 9mm, it was confirmed that the sound absorption rate is not sufficiently improved by using a polyester composite sound absorbing material having a thickness of 5mm. .

In the trial and error of producing a composite sound absorbing material by combining various types of sound absorbing materials on a wooden board, the present inventors are most preferred to facilitate the construction by minimizing the increase of the sound absorbing material weight and the thickness of the sound absorbing material. It was found that the microfiber sound absorbing material is attached to complete the present invention.

Microfiber sound absorbing material used in the present invention is composed of extremely fine fibers and has an excellent sound absorption rate, the body is very soft and has the advantage of maintaining a constant thickness even when compressed. The sound absorbing power of microfiber absorbers is because the thickness of the fiber is thin. Ordinary fibrous sound absorbers use chips of 4 ~ 15 denier thickness by injecting chips first, whereas microfiber fibers have a diameter less than 1/10 of normal short fibers. Known as As the fiber diameter of the sound absorbing material becomes thinner, it reacts sensitively to less sound energy and can produce more fibers with the same weight, which intensifies the refraction of air in the sound absorbing material, resulting in higher thermal energy conversion of sound energy. It gets worse in the high frequency range.

When the sound absorption rate of the sound absorbing material increases, the thickness of the sound absorbing material to be used can be reduced, and a sufficient effect can be obtained even with a small thickness. Microfiber sound-absorbing material is light and thin, but has many pores, so it shows warmth and excellent sound absorption, and is used for climbing jackets and soundproofing of cars.

Such microfiber absorbers are hardly used for interior construction because they are rolled like a fabric and the surface is white so that there is no interior finish. As a result, it is mainly used for soundproofing of automobiles, etc., which are not exposed to the surface, but not in the field of interior construction, which requires interior finishing. Furthermore, if the interior fabric is attached to the surface to improve the interior of the microfiber sound absorbing material, the sound absorbing properties can be maintained, but the finishing surface is not as flat as the polyester sound absorbing board.

On the other hand, because the wood wool board has a thick and relatively large pores to act as a passageway, when combined with the microfiber absorbent material, it will be able to effectively exhibit the sound absorbing performance while complementing the disadvantages of the surface finish. In addition, since the sound absorption rate of the original wood wool board is low, when the ultra-fine sound absorbing material is combined, it is possible to significantly increase the sound absorption rate of the wood wool board, and it can be confirmed by a test that the sound absorbing material of the wood board is sufficiently compensated by the test. Could increase the effect.

Using the properties of these microfiber absorbers, it is possible to produce microfiber absorbers in the range of 300g ~ 1000g / m², the sound absorption rate is determined according to the thickness, it is confirmed in the present invention that can be made of wood board composites having various levels of sound absorption And the present invention could be achieved.

Table 2 below shows the sound absorption test results of the sound absorbing material under review including the microfiber sound absorbing agent 300g / m². The sound absorption test was conducted in accordance with the method for measuring sound absorption in the reverberation chamber (KS F 2805), which is a general test method for building sound absorbers.

frequency
(Hz) Artboard 9mm, 230 Kg / m ³ Wood board 15mm Microfiber sound absorbing material 300g Wood board 15mm / Air layer 30mm Wood board 25mm / Air layer 30mm Wood board 15mm / microfiber absorbent 300g 250 0.03 0.08 0.05 0.15 0.21 0.11 500 0.12 0.15 0.17 0.35 0.44 0.27 1000 0.36 0.26 0.53 0.66 0.75 0.70 2000 0.65 0.64 0.75 0.59 0.56 0.93 NRC 0.30 0.28 0.38 0.44 0.49 0.50

Comparing the sound absorption rate of each test from Table 2, it can be seen that the sound absorption performance of the Momo board alone shows a high result at a low frequency of 250 Hz, the sound absorption performance of the microfiber sound absorbent is excellent when more than 1000Hz. If the 30mm air layer is placed on the backside of the wood board, the overall sound absorption is improved from the low frequency range, but if it exceeds 1000 Hz, the sound absorption is lower than the sound absorption performance of the wood board alone. However, when the microfiber absorber 300g / m² is attached to the backside of the wood wool board, the sound absorption rate is lower than that of the wood wool board + air layer 30mm in the 250Hz ~ 500Hz area, but the sound absorption rate in the high sound is dramatically increased to move the maximum value of the sound absorption rate to 2000Hz. From this, it can be said that wood board + microfiber absorber shows more sound absorbing power in high frequency range of noise level.

When the sound absorption rate index is evaluated based on the NRC value, when the microfiber sound absorbing material 300g / m² is attached to the wood wool board 15mm, the sound absorbing power can be obtained by arranging the rear air layer 30mm on the wood wool board 25mm. At this time, the specification of the sound absorbing material has a thickness of 18T, weight of 8.2Kg / m², so it can be said that there is almost no change. Of course, it is possible to change the sound absorbing power of the wood board composite by changing the specification of the microfiber sound absorbing material.

On the other hand, it is confirmed that the method for preventing breathable pollution in the wood wool board used in the present invention can be solved by attaching the synthetic resin sheet to the back of the wood wool board as specified in the design of the high-density polyester composite sound absorbing material already proposed by the present inventors. It was. In addition, due to the rigid nature of the wood board, the vinyl sheet attached to the back of the wood board may be damaged, and in order to improve sound absorption, it is preferable to attach the vinyl sheet to the wood fiber board first after attaching the vinyl sheet to the sound absorbing material. Confirmed.

The sound absorption of the wood wool board of the present invention is determined by the thickness of the microfiber absorber, so the thickness of the microfiber absorber may be determined by comparing the existing test results, and the thickness of the microfiber absorber may be converted into the weight per square meter of the microfiber absorber. have.

If the thickness of the microfiber absorbent material becomes thick, there is no lateral binder due to its characteristics, so that microfibers are scattered inside both covers, causing swelling or agglomeration in the transverse direction during cutting. This can be easily solved by adding a quilting step to the finish of the microfiber absorber.

The present invention adheres the microfiber sound absorbing material and the thin synthetic resin sheet closely to the back of the wood wool board, while increasing the sound absorbing power of the wood wool board sound absorbing material, while maintaining the porosity for sound insulation (absorption), while blocking the air flow with the wall. To achieve the constructability effect. Even if the state of the wall is cracked or foreign matter protrudes to open the gap with the sound absorbing material, the synthetic resin sheet attached to the back will block the flow of air, thereby preventing the adsorption of dust in a specific direction.

1 is a cross-sectional view showing a wood board composite sound absorbing material according to the present invention.
Figure 2 is an exemplary view illustrating an embodiment of the company logo engraved on the outer surface of the synthetic resin sheet of the wood wool board composite sound absorbing material according to the present invention.
3 is a schematic view showing an apparatus for bonding a vinyl sheet to a sound absorbing material according to the present invention.

Hereinafter, with reference to the accompanying Figures 1 to 3 will be described in detail with respect to each aspect of the present invention.

1 is a cross-sectional view showing a wood board composite sound absorbing material according to the present invention. Figure 2 is an exemplary view illustrating an embodiment of the company logo engraved on the outer surface of the sheet bonded to the wood board composite sound absorbing material according to the present invention. The present invention will be described in detail with reference to these drawings.

In Figure 1, the composite sound absorbing material 10 of the present invention is a commercially available porous plate-shaped sound absorbing material 20, microfiber sound absorbing material 40 and synthetic resin sheet 50 and the first and the adhesive by attaching them, respectively; It consists of the 2nd contact bonding layers 30 and 35. FIG. The wood board sound absorbing material 20 used in the present invention is a wood board made of wood fiber on the market. It uses a commercially available standard standard 600 x 1200 x 15-25mm (W x L x H), but it can be cut and divided as needed or a larger standard.

The thickness of the wood board sound absorbing material 20 is preferably 50 mm or less when producing a product having the same density in consideration of the thickness of a general sound absorbing plate or soundproofing plate, because when it is larger than 50 mm, there is a problem in constructability to use the sound absorbing material.

In addition, the synthetic resin sheet 50 used in the present invention is a thermoplastic resin or melamine resin such as crystalline polyethylene, nylon, polyacetal resin and amorphous vinyl chloride resin, polystyrene, ABS resin, acrylic resin, PET resin, OPP resin, Sheets made of thermosetting resins such as phenol resins and urea resins may be used, and various choices may be made depending on the construction and price of the sound absorbing plate, and may be referred to as vinyl sheets. The size of the synthetic resin sheet 50 will depend on the size of the composite sound absorbing material, but when using a general composite sound absorbing material, it is possible to use a rolled product wound at a width of 1220 mm and a length of 50 m or more. It can be prepared separately.

The microfiber absorbing material 40 is between the sound absorbing material 20 and the synthetic resin sheet 50 as shown in FIGS. In addition, the adhesive constituting the first and second adhesive layers 30 and 35 used in the present invention is sufficient if it is a general industrial adhesive or hot melt adhesive capable of bonding the polyester fiber and the synthetic resin to a certain strength.

Although the thickness of the synthetic resin sheet 50 and the first adhesive layer 30 will be relatively determined according to the thickness of the wood wool board sound absorbing material 20, if the thickness of the sound absorbing material 20 is 50mm or less, the relative synthetic resin sheet 50 and The thickness of the first adhesive layer 30 is suitably in the range of about 0.02 mm to 4 mm. The second adhesive layer 35 between the microfiber sound absorbing material 40 and the synthetic resin sheet 50 may have a similar range.

As another aspect of the present invention, the ad text 55 may be printed on the outer surface of the non-bonded sheet of the synthetic resin sheet 50 adhered to the sound absorbing material 20 of the present invention. The ad text 55 may be any text as long as it can enhance the productability by printing the company and the product logo and the grid pattern on the back side as well as promoting the composite sound absorbing material in the future. The ad text 55 may be printed before the synthetic resin sheet 50 is attached to the sound absorbing material 20, or may be printed after being attached, but it may be preferable to print before the attachment.

Finally, the manufacturing process of the present invention is summarized by first attaching the microfiber sound absorbing material and the resin sheet from the taping machine and cutting according to the size of the wood board, and manually attaching the composite sheet to the back of the wood board, and do not apply heat. By processing at room temperature, the strain can be prevented from occurring under normal circumstances.

The present inventors confirmed that a slight modification of the manufacturing apparatus of the high-density polyester composite sound absorbing material used in the preliminary registration of the present inventors can be used for the attaching process of the synthetic resin sheet 50 and the microfiber absorbing material 40. It will be described below with reference to the schematic diagram of the apparatus for producing a composite sound absorbing material specified in FIG.

First, the microfiber sound-absorbing material (standard: 1200 mm, roll) 40 is placed on the shelf 80 of the sheet attachment facility (tapping machine) to check the front side, and then the rear side faces the shelf 80 of the taping attachment facility. It mounts on the roller 82. Subsequently, a sheet of the synthetic resin sheet (size: 1210 mm in width, prepared in a roll state wound at least 50 m) 50 is inserted into the controller 81 and fixed so as not to be pushed to both sides during rotation. .

Then, the power of the taping machine is turned on, and the sound absorbing material 40 is held by both hands to the tape attachment point while being pushed in while adjusting the rotational speed appropriately. Hold the end of the synthetic resin sheet 50 by hand and pull it over a guide roller (not shown), and then attach the synthetic resin sheet 50 to the center side by side at the end of the microfiber sound absorbing material 40, wherein the synthetic resin sheet Care should be taken that the lengthwise direction of the product and the lengthwise direction of the synthetic resin sheet 50 coincide in parallel so as not to be wrinkled while the 50 is attached. On the other hand, the guide roller is made so that the synthetic resin sheet 50 is flattened by making protruding spirals starting from both ends of the roller so that the threads are centered in the rotational direction so that the sheet is flattened while the roller rotates.

Subsequently, when the upper roller 71 and the lower roller 73 and the microfiber absorbing material 40 are positioned below the roller, the synthetic resin sheet 50 is attached to the sound absorbing material 40 by the rotation of the roller, and the microfiber absorbing material 40 is Watch out for twists while moving. The lower roller 73 is forcibly rotated by connecting to the motor, and to make the surface irregularities to prevent slipping. On the other hand, the upper roller 71 is made of a free rotation device so that the ultra-fine proceeds in accordance with the rotation of the lower roller 73 is rotated by the frictional force with the sound absorbing material (40).

In the case of spraying the adhesive on the synthetic resin sheet 50, two nozzles 75 which are moved to the left and right between the sound absorbing material 40 and the vinyl sheet are installed at the ultrafine and spray the adhesive at a constant speed from the nozzle 75. Press bonding is performed with the lower rollers 71 and 73. Here, the nozzle 75 reciprocates so that the ultrafine particles are injected in the width direction of the sound absorbing material 40 and in the width direction of the resin sheet 40, and the injection method passes through the compressed air.

In addition, in consideration of using the adhesive synthetic resin sheet 50 in the upper roller 71, the rod is connected to a control box (not shown) capable of temperature control so that its temperature can be adjusted between 70 ~ 200 ℃ as necessary A heater of a type (not shown) may be inserted therein. In addition, the adhesive is first coated on the synthetic resin sheet 50 and then attached to the ultra-fine sound absorbing material 40 can simplify the manufacturing process.

The composite sheet of the ultra-fine sound absorbing material and the synthetic resin sheet thus prepared is cut to fit the size of the wood wool board sound absorbing material, and then sprayed with adhesive on both sides of the wood wool sound absorbing material and the composite sheet, and then manually attached to the wood wool sound absorbing material is completed.

10: composite sound absorbing material, 20: wood board sound absorbing material, 30 and 35: first and second adhesive layer, 40: microfiber absorbing material, 45: nozzle, 50: synthetic resin sheet, 55: ad text, 71: upper roller, 73: lower roller , 77: citrol, 80: lathe, 81: controller, 82: sound absorbing roller

Claims (3)

Made of wood fiber, wood board porous sound absorbing material of 50mm or less,
Polypropylene microfiber microfiber absorbing material bonded to one side of the sound absorbing material and having a thickness of 20 mm or less, and
Wood board composite sound absorbing material comprising a synthetic resin sheet in turn bonded to the microfiber sound absorbing material. According to claim 1, The synthetic resin sheet is commercially available vinyl chloride, PET or OPP (oriented polypropylene) wood wool board composite sound absorbing material. The wood-board composite sound absorbing material according to claim 1 or 2, wherein various patterns are printed on the outer surface of the sheet to give an advertising effect.

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