JP2005074694A - Damping material and removable alcove using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a damping material capable of corresponding to the unevenness of a substrate material or the like and made easy to dispose. <P>SOLUTION: This removable alcove is equipped with an alcove finish material 16, the damping material 3 provided in contact with the under surface of the alcove finish material 16, the substrate material 18 provided in contact with the under surface of the damping material 3 and a plurality of support devices 22 for supporting the substrate material 18 so as to separate the same from an alcove slab 20. The damping material 3 is formed of a woody fiberboard of which the average density is 0.85-1.05 g/cm<SP>3</SP>and the densities of the upper and rear layers of the woody fiberboard are smaller than the density of the layer 5 including the central part in the thickness direction of the woody fiberboard. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a vibration damping material for reducing a sound pressure level and a floor provided to be floated on a floor foundation of a building using the vibration damping material.

Conventionally, various floor damping materials have been used. For example, what uses the wood fiber board which has a hard layer with a high surface density is known (patent document 1). As another floor, for example, a receiving plate made of particle board is provided, a vibration damping material made of inorganic compound asphalt is provided on the receiving plate, and a flooring material is used as a finishing material on this. (Patent Document 2).
JP-A-7-9404 JP 2000-154633 A

  However, the wood fiber board having a hard layer with a high surface density (Patent Document 1) has a relatively high bending rigidity. Therefore, if there is unevenness in the foundation board laid under this, the wood fiber board becomes the foundation board. First, there is a gap between the two plates. When a gap is generated between the wood fiber board and the base board, resonance of impact sound or squeak noise is generated.

  In addition, the use of asphalt with an inorganic substance as a damping material is an environmental problem, such as a problem of toxic gas in the event of fire or incineration, and a treatment work that separates asphalt with an inorganic substance and wooden material during dismantling. And disposal problems remain.

  An object of the present invention is to cope with unevenness of a base material and the like and to be easily disposed of.

The vibration damping material of the present invention is formed of a wood fiber board, and the wood fiber board has an average density in a range of 0.85 g / cm ³ to 1.05 g / cm ³ , The density of the front and back layers is smaller than the density of the layer including the center in the thickness direction of the wood fiber board.

  By doing so, the density of the front and back layers of the wood fiber board is formed smaller than the density of the layer including the center in the thickness direction of the wood fiber board, so the bending Young's modulus is reduced. For this reason, even if the foundation material provided under the damping material is uneven, the damping material is compatible with the foundation material and does not generate a gap.

  Furthermore, since the damping material is formed from a wooden fiberboard, there is almost no generation of toxic gas in the event of a fire or an incineration process during dismantling. And since a wood fiber board is mainly formed from a wood raw material, it does not need to separate at the time of disposal, and is easy to carry out disposal processing.

Furthermore, since the average density of the wood fiber board has a value that falls within the range of 0.85 g / cm ³ to 1.05 g / cm ³ , the sound insulation performance as a damping material is ensured with a sufficient mass.

  The floor according to the present invention includes a floor finishing material, the vibration damping material provided in contact with the floor finishing material, a base material provided in contact with the vibration damping material, and the base material. And a plurality of support means for supporting the base plate separately from the floor base.

  In this way, even if there is unevenness in the floor base or the base material, as described above, the damping material has a small bending Young's modulus, so the vibration control material is compatible with these materials and gaps are generated. There is nothing. Since no gap is generated between the damping material and these materials, there is almost no resonance or squeak of the impact sound.

  In addition, there is almost no generation of toxic gas in the event of a fire or incineration when dismantling the floor. Further, since the vibration damping material is formed of a wood fiber board, it is not necessary to separate it at the time of disposal and it is easy to dispose of it.

  Next, each requirement constituting the present invention will be described in more detail. The vibration damping material of the present invention is used in places where the sound insulation level or sound energy needs to be reduced, for example, floor materials, wall materials, ceiling materials, etc., particularly for floor slabs made of reinforcing steel or steel concrete provided in buildings. It is suitable for a standing floor (or a floating floor) provided to float. Incidentally, the damping material is preferably provided on the entire floor. Moreover, you may form a groove | channel on the back surface for easy compatibility.

  The wood fiber board forming the damping material has a layer including the center thereof and front and back layers located on both sides thereof, and has at least a three-layer structure. The boundary between the layer including the center and the front and back layers may not necessarily be clear, and the density may gradually change from the layer including the center to the front and back layers in the thickness direction. However, the density of the front and back layers is smaller than the density of the layer including the center. The front and back layers do not necessarily have to be formed at the same density in the front layer and the back layer, and may have different densities.

The average density of the wood fiber board is a value obtained by dividing the mass of the whole wood fiber board by its total volume, and the value falls within the range of 0.85 g / cm ³ to 1.05 g / cm ³ . When the average density is less than 0.85 g / cm ³ , the mass as the damping material is small and the sound insulation performance is poor. If the average density exceeds 1.05 g / cm ³ , the quality of the wood fiber mat (hereinafter referred to as “wood mat”), such as the hot-pressing conditions and the plate thickness accuracy, becomes severe and the cost increases. .

The density of the front and back layers of the wood fiber board is preferably in the range of 0.4 g / cm ³ to 0.7 g / cm ³ . When the density of the front and back layers is less than 0.4 g / cm ^3, the front and back surfaces of the wood fiber board are too soft and difficult to handle, and are easily damaged during transportation and transportation. When the density of the front and back layers exceeds 0.7 g / cm ³ , the bending Young's modulus of the wood fiber board becomes large, and the familiarity with the base material becomes insufficient, so that it becomes impossible to cope with unevenness. The density of the layer including the center of the wood fiber board is preferably in the range of 0.9 g / cm ³ to 1.2 g / cm ³ . If it carries out like this, the sound insulation performance by the layer containing a center can be improved, ensuring familiarity.

By the way, the density of the front and back layers of the wood fiber board is in the range of 0.4 g / cm ³ to 0.7 g / cm ³ , and the density of the layer including the center of the wood fiber board is 0.9 g / cm ³ to 1 The bending Young's modulus in the range of .2 g / cm ³ is about 2,000 to 6,000 N / mm ² . On the other hand, a general wood fiber in which the density of the front and back layers is higher than the density of the layer including the center in the wood fiber board in which the average density is in the range of 0.85 g / cm ³ to 1.05 g / cm ³ The bending Young's modulus of the board is about 4,000 to 7,000 N / mm ² , and it can be seen that the bending Young's modulus of the wood fiber board of the present invention is lower and it is easy to adapt to the base material.

  The method for producing a wood fiber board in which the density of the front and back layers is smaller than the density of the layer including the center is, for example, (1) Forming a wooden mat with less than the amount of adhesive used to impregnate the fiber to be formed, and heating and pressing the wooden mat. (2) Fiber that is dropped to form the front and back layers in the process of forming the wooden mat A wood mat is formed by lowering the moisture content of the fiber to be lower than the moisture content of the fiber that is lowered to form a layer including the center, and the wood mat is heated and pressed. (3) Wood with foamed front and back layers Methods such as forming a mat in advance, heating and pressing the wood mat, and (4) using a precure layer can be used alone or in combination.

  The laying floor of the present invention is provided to float on the floor foundation of a building, for example, a floor slab. The said damping material can be used for a floor and can reduce the light floor impact sound and heavy floor impact sound which generate | occur | produce on a floor. The floor finish is a flooring material with a decorative surface on the surface. Although the thing with a large thickness is preferable, it is good to use a thing of at least 9 mm or more. As the base material, it is preferable to use a comparatively thick structural plywood, particle board or the like having a thickness of 12 mm or more, for example.

  The supporting means is not particularly limited as long as the base material is floated from the floor base. For example, a receiving seat portion on which the base material is placed, a support column portion extending vertically from the receiving seat portion, and the support column portion are provided. It has a pedestal part to support. The receiving seat portion and the support column portion are formed to be freely rotatable, and a height adjusting means such as a screw may be provided between the support column portion and the pedestal portion.

  According to the vibration damping material of the present invention and the floor using the same, the front and back layers of the wood fiber board are formed to be smaller than the density of the layer including the center. There is no gap between the substrate and the base material, and there is no sound resonance or squeak. Furthermore, since the damping material is formed of a wood fiber board, it is easy to dispose of it.

  Hereinafter, the best mode of a vibration damping material according to the present invention and a floor using the same will be described in detail with reference to the drawings. 1 to 4, the same or equivalent parts are denoted by the same reference numerals.

  FIG. 1 is a perspective view showing an embodiment of a floor according to the present invention. FIG. 2 is an enlarged cross-sectional view of a position where the support device in FIG. 1 is provided. The laying floor 1 is provided floating on a floor slab 20 made of reinforcing steel or steel concrete provided in a building. That is, the floor 1 is composed of a floor finishing material (flooring material) 16, a damping material 3 provided in contact with the floor finishing material 16, and a ground panel provided in contact with the damping material 3. A base material 18 and a plurality of support devices (support means) 22 that support the base panel 18 apart from the floor slab (floor base) 20 are provided. Incidentally, the damping material is provided on the entire surface of the base panel.

FIG. 3 is an enlarged cross-sectional view of the damping material 3 in this embodiment. The damping material 3 is a wood fiber board having a substantially three-layer structure, and includes a layer 5 including the center in the thickness direction 11 of the wood fiber board, and a surface layer 7 formed on the inner side in the thickness direction 11 from the surface 13 of the wood fiber board. The back layer 9 is formed on the inner side in the thickness direction 11 from the back surface 14 of the wood fiber board. The density of the surface layer 7 and the back layer 9 is formed smaller than the density of the layer 5 including the center. That is, the densities of the surface layer 7 and the back layer 9 are equal and included in the range of 0.4 g / cm ³ to 0.7 g / cm ³ , and the density of the layer 5 including the center is 0.9 g / cm ³ to 1. It is contained in the range of 2 g / cm ³ .

  In FIGS. 1 and 2, the floor finish 16 has a decorative surface on its surface and preferably has a large thickness, but it should be at least 9 mm. For the base material 18, a structural plywood, a particle board, or the like that is relatively thick, for example, 12 mm or more is used.

  A plurality of support devices 22 are provided so as to be positioned at the four corners of a rectangular base material 18 having a size of 910 × 1820 mm, for example. Further, the support device 22 includes a receiving seat portion 24 on which the base material 18 is placed, a support column portion 26 extending vertically from the receiving seat portion 24, and a pedestal portion 28 that supports the support column portion 26. The column portion 26 is provided vertically from the center of the receiving seat portion 24 opposite to the side receiving the base material 18. The receiving seat part 24 and the support | pillar part 26 are good to be formed so that rotation is possible freely. The support column 26 and the pedestal 28 are preferably provided with height adjustment means between them, for example, one that can be finely adjusted by a male screw and a female screw.

Next, a method for manufacturing the damping material 3 shown in FIG. 3 will be described. First, a method for producing a wood mat by adjusting the amount of the adhesive used in (1) will be described. The fiberboard that forms the damping material 3 uses wood fibers that have been defibrated by a refiner (defibrating device) by steaming wood chips such as hardwoods and conifers to loosen the bond between fibers. In addition to wood fibers such as broad-leaved trees and coniferous trees, plant fibers such as bamboo, straw, rice leaves, bacus, and knot straw produced as a by-product in large quantities from pulp mills may be used. As the refiner, there are used those that defibrate wood chips taken out from a high-temperature and high-pressure steam (10 kgf / cm ² ) steaming device, and those that are directly connected to the steaming device under high temperature and pressure.

  Since the wood fiber discharged from the refiner has a large amount of moisture, it is put into the hot air duct from the refiner and dried while being blown. The air feeding speed is 10 to 30 m / sec and the air sending atmosphere temperature is about 30 to 120 ° C., but is adjusted over a wide range depending on the density of the wood fiber, the feeding amount, the processing ability of the front and rear processes, and the like. The wood fiber is dried to a moisture content of about 5 to 10% by this hot air blowing.

  Next, the dried wood fiber is coated with an adhesive to form an adhesive-coated wood fiber. This is formed into a mat shape to form an adhesive-coated wood mat. In other words, the wood mat is a glue-coated mat with a reduced adhesive amount. The adhesive-coated wood fiber is blown to the felt to form an adhesive-coated mat, which is further bonded to the adhesive. Adhesive coated mat that becomes a layer including the center by air blowing the agent coated wood fiber is laminated, and finally the adhesive coated mat that reduces the adhesive is blown to the felter to become the surface layer. It is formed by laminating. A wood fiber board is formed by hot-pressing the three-layer adhesive-coated mat.

  In order to apply the adhesive to the wood fiber, first, the dried wood fiber is put into a blender (mixing device). A heat curable adhesive to which a foaming agent composed of a thermoplastic synthetic resin capsule containing a volatile liquid is added is mixed in a blender, and the adhesive is applied to the wood fiber. Moreover, it can also carry out by the method of adding a thermosetting adhesive agent and a foaming agent simultaneously with defibration without using a blender, and the method of spraying in a ventilation duct and apply | coating to the floating wood fiber.

  Next, (2) a method for producing a wood mat by adjusting the moisture content of the wood fiber will be described. The dried wood fiber is coated with an adhesive to form an adhesive-coated wood fiber. At this time, the adhesive-coated wood fiber with reduced moisture content is sent to the felter to become the back layer. A coating mat is formed. Furthermore, an adhesive-coated mat that becomes a layer including the center is laminated on the adhesive-coated wood fiber having an increased moisture content. Finally, an adhesive-coated wood fiber with reduced moisture content is blown to a felter to form and laminate an adhesive-coated mat that becomes a surface layer. A generally used method is used to adjust the moisture content. A wood fiber board is formed by hot-pressing the three-layer adhesive-coated mat.

  Next, a method for obtaining a wood mat with foamed front and back layers in (3) will be described. The dried wood fiber is coated with an adhesive to form an adhesive-coated wood fiber. At this time, a foaming agent composed of a thermoplastic synthetic resin capsule is mixed with the adhesive. The adhesive-coated wood fiber containing the foaming agent is blown to the felter to form an adhesive-coated mat serving as a back layer. By heating the adhesive-coated mat, a wood mat that forms a back layer is formed by foaming. Similarly, adhesive-coated wood fibers containing a foaming agent made of thermoplastic synthetic resin capsules are blown to a felter to form an adhesive-coated mat that becomes a surface layer. By heating the adhesive-coated mat, a foamed wood mat is formed as a surface layer. On the other hand, the wood mat as a layer including the center is formed by applying an adhesive to dried wood fiber to form an adhesive-coated wood fiber, and the adhesive-coated wood fiber is blown to a felter. The desired three-layer wood mat is formed by stacking the foamed wood mat on the front and back of the wood mat which is a layer including the center.

  The volatile liquid of the foaming agent comprising the thermoplastic synthetic resin capsule containing the volatile liquid used in the present invention is n-butane, n-pentane, neopentane, n-hexane, neohexane, cyclohexane, n-octane, iso- Chained or cyclic saturated hydrocarbons such as octane, chained or cyclic unsaturated hydrocarbons such as n-pentene, n-hexene, cyclohexene and n-octene, ethers such as aromatic hydrocarbons, ethyl ether and ethyl-propyl ether , Organic compounds generally called organic solvents such as ketones such as acetone and methyl ethyl ketone, acetic esters such as methyl acetate and ethyl acetate, cellosolves such as cellosolve acetate and butylcellosolve, alcohols such as methanol and ethanol, or fluorine-based compounds The compound is mainly Murrell.

  As the thermoplastic synthetic resin constituting the capsule outer shell, one that is insoluble in the built-in volatile liquid is selected, and one that has an appropriate softening point is selected according to the foaming temperature. Examples of such thermoplastic synthetic resins are polyethylene, polypropylene, acrylic resin, methacrylic resin, styrene resin, and the like. The capsule type foaming agent is described in detail, for example, in Japanese Patent Publication No. 42-26524.

  The thermosetting adhesive used in the present invention is called urea resin, melamine resin, urea-melamine co-condensation resin, phenol resin, alkylphenol resin, resorcin resin, alkyl resorcin resin (shell oil resorcin obtained from oil mother shell rock, etc.) Various resins such as epoxy resin, urethane resin, alkyd resin, and thermosetting alkyl resin, and thermoplastic synthetic resins. The synthetic resins include paraffin and wax. You can mix them.

  Other than the above composition, for example, fillers such as calcium carbonate, titanium white, bentonite, talc, wood flour, wheat flour, acid and alkali curing catalysts, condensation regulators such as ε-caprolactam, urea, resorcin, or formalin catcher, anti-aging agent UV absorbers, preservatives, insecticides, flame retardants, water repellents, dyes, pigments and the like may be mixed. The amount of heat-curing adhesive added is usually 30% or less by weight with respect to the wood fiber, and the resin ratio is, for example, 10 to 60%, and the lower resin ratio is generally more uniform with respect to the wood fiber. Can be mixed.

  About 0.1 to 200% of the foaming agent is added and mixed with the adhesive. After first adding and mixing the adhesive in the blender into which the wood fiber has been added, then adding and mixing the capsule-type foaming agent, or vice versa, the capsule-type foaming agent and then adding and mixing the adhesive individually. It may be added and mixed.

  The foaming agent in the adhesive is foamed by heating, and the adhesive is heat-cured. The foaming agent comprising a thermoplastic synthetic resin capsule containing a volatile liquid that volatilizes by heating is softened by heating because the outer shell of the foaming agent is a thermoplastic synthetic resin. The expansion causes foaming and expansion to form closed cells and the adhesive is cured. The internal pressure in the pressed wood mat is increased by the volume expansion accompanying the foaming of the capsule-type foaming agent.

The three-layer wood mat is inserted into a hot press and hot pressed. Alternatively, the wood mat that is continuously conveyed may be inserted into a continuous press such as a heating roller press and subjected to continuous hot pressing, and then cut into a fixed size. The hot pressure conditions (hot pressure, temperature, time, etc.) are adjusted over a wide range according to the foaming temperature, the foaming ratio, the amount of foaming agent added, the curing temperature of the adhesive, the amount of adhesive added, and the like. Generally, the pressure is about 5 to 50 kgf / cm ² at a temperature of 100 to 200 ° C. when the thermosetting adhesive is urea resin, 160 to 200 ° C. when phenol resin is used, and 100 to 150 ° C. when resorcin resin is used. The hot pressing is performed in about 1 to 20 minutes.

  When the internal pressure in the wood mat increases, the wood fibers adhere to each other in combination with the pressure from the hot plate, increasing the contact area between the wood fibers, that is, the bonding area, and the wood fibers are adhesive and thermoplastic. It is connected by the resin, the bonding area is substantially increased, the bonding force is improved, and the mechanical strength and the internal bonding force are remarkably improved. Furthermore, the synthetic resin closed cells derived from the capsule-type foaming agent are uniformly formed in the wood fiber gap, and the gap between the fibers is reduced, so that the heat insulating property and the moisture blocking property are improved. In particular, a fiberboard in which an independent foaming structure associated with foaming of the foaming agent is formed between the wood fibers in the front and back layers can be obtained easily and efficiently.

  The present invention is a fiberboard having a three-layer structure having the structure as described above. Even if the fiberboard is difficult to obtain a uniform internal structure, the capsule-type foaming agent can be uniformly mixed in the front and back wood mats. For example, the space between the wood fibers has a uniform closed-cell foam structure consisting of synthetic resin bubbles, reducing the voids communicating with the outside, improving heat insulation and moisture barrier properties, and suppressing expansion and contraction due to water absorption and dimensional stability. In addition, internal destruction does not occur due to freezing of the built-in water in a low temperature environment. Also, adhesive strength of adhesive, adhesive strength of thermoplastic synthetic resin, mechanical cross-linking adhesion of wood fibers by the resin coating by foaming, contact area of wood fibers by internal pressure due to foaming of foaming agent (adhesion area) ) Increases the adhesive effect.

  Next, a method for producing a wood fiber board using the precure layer (4) will be described. The dried wood fiber is coated with an adhesive to form an adhesive-coated wood fiber. This is formed into a mat shape to form an adhesive-coated wood mat. By heating and pressing the adhesive-coated wood mat, a wood fiber board having a high-density layer having a predetermined thickness on both sides can be obtained. At this time, a low-density layer is formed on the surface layer and the back layer by pre-curing the adhesive during heating and pressing of the wood fiber board. By using this low-density layer, a low-density layer can be formed on the front and back of the wood fiberboard.

  Next, the operation of the damping material 3 and the floor 1 of the present embodiment will be described. The damping material 3 is formed such that the density of the front and back layers 7 and 9 of the wood fiber board is smaller than the density of the layer 5 including the center in the thickness direction of the wood fiber board, so that the bending Young's modulus becomes small. For this reason, even if the ground material 18 provided under the vibration damping material 3 is uneven, the vibration damping material 3 is familiar and no gap is generated.

  Furthermore, since the damping material 3 is formed from a wood fiber board, there is almost no generation of toxic gas in the event of a fire or an incineration process during dismantling. And since a wood fiber board is mainly formed from a wood raw material, it does not need to separate at the time of disposal, and is easy to carry out disposal processing.

Furthermore, since the average density of the wood fiber board has a value that falls within the range of 0.85 g / cm ³ to 1.05 g / cm ³ , the rigidity as the fiber board is ensured and the density of the layer including the center is relatively high. Excellent sound insulation due to its large size.

  In addition, even if the floor slab 20 or the base material 18 is uneven, the placing floor 1 has a small bending Young's modulus of the vibration damping material 3 as described above. A familiar gap does not occur. Since no gap is generated between the damping material 3 and the base material 18, there is almost no resonance of floor impact sound or squeak noise.

  Furthermore, there is almost no generation of toxic gas in the event of a fire or incineration treatment when the laying floor 1 is dismantled. Further, since the vibration damping material 3 is formed of a wood fiber board, it is not necessary to separate at the time of disposal, and the disposal is easy.

FIG. 4 is a cross-sectional view showing another embodiment of the vibration damping material according to the present invention. In the damping material 3 of the embodiment shown in FIGS. 1 to 3, the wood fiber board has an average density in the range of 0.85 g / cm ³ to 1.05 g / cm ^3. The layer is less dense than the layer including the center. On the other hand, in the vibration damping material 4 shown in FIG. 4, the density of the front and back layers 8 and 10 is larger than the density of the layer 6 including the center. The density of the front and back layers 8 and 10 is, for example, 0.9 g / cm ³ to 1.2 g / cm ³ , and the thickness has a layer thickness of about 0.3 to 1.0 mm. On the other hand, the density of the layer 6 including the center is, for example, 0.4 g / cm ³ to 0.7 g / cm ³ . Furthermore, the damping material 4 has a plurality of parallel grooves 15 on the back side thereof, and is formed in a comb shape in cross section. The depth of the groove 15 is preferably larger than the layer thickness of the back layer 10 but is not formed deep on the layer 6 side including the center. That is, if the layer thickness of the back layer 10 is 0.3 to 1.0 mm, the depth of the groove 15 is limited to about several mm at most. The pitch between the groove 15 and the groove 15 is set to an appropriate size so that the damping material fits the base material.

  The manufacturing method of the wood fiber board which has a high-density layer on the front and back can be manufactured by a dry method, for example. Dismantle wood chips or waste wood chips, such as pine, cedar, and firewood, and softwood such as capol, lawan, chestnut, and poplar, or mix wood flour such as thunder dust and saw dust appropriately. Obtain wood fiber, add adhesive, sizing agent, etc. to this wood fiber, dry it, deposit this wood fiber on a screen conveyor with a forming device, pre-press to make a wood fiber mat, then to a certain size After cutting into a regular wood mat, a wood fiber board is obtained by heat-pressing it.

  In this manufacturing process, by increasing the amount of adhesive added to the wood fiber or increasing the moisture content of the wood fiber, a high-density layer is formed on both sides of the obtained wood fiber board, and the high-density layer The layer thickness can be increased.

  Also, water is applied to the upper and lower surfaces of the standard wooden mat or water-retaining sheet-like materials such as nonwoven fabric, paper, and cloth are placed on the upper and lower surfaces of the wooden mat. Heat and press in the state. As a result, heat pressing is performed in a state where the moisture content of the front and back portions is increased, so that a high-density layer having a large layer thickness is formed on the water application surface or the sheet-form placement surface side.

  In this case, by adjusting the amount of water applied and the water content of the sheet-like material as appropriate, or by adjusting the amount of adhesive added to the wood fiber and the moisture content of the wood fiber, the desired density of the high-density layer can be obtained. Density and layer thickness can be given.

  In this way, a wood fiber board having a high-density layer having a predetermined layer thickness on both sides is obtained. In this wood fiber board, a low-density thin surface layer is formed by adhesive pre-curing at the time of heating and pressing. Therefore, if necessary, at least the surface side is sanded to remove the low-density thin surface layer, and the high-density layer is exposed on the surface. On the surface high-density layer of the wood fiber board, a base treatment such as a sealing treatment, a sealer treatment, and an abrasion resistance treatment is performed as necessary.

  Next, the action of the damping material 4 is as follows. That is, since the front and back layers 8 and 10 are higher in density than the layer 6 including the center, the wood fiberboard itself has a large bending Young's modulus and is excellent in tensile strength, compression strength and bending strength, and has a very large amount of bending deflection. It is small and suitable as a flooring material. In addition, impermeableness is imparted by the high-density layer on the surface.

  Furthermore, since a plurality of grooves 15 are formed on the back layer 10 side, the vibration damping material itself is easy to bend and easily contacts or adheres to the base material, so that a gap is generated between the vibration damping material and the base material. do not do. Therefore, it is possible to cope with unevenness of the base material. Moreover, since the damping material 4 is a wood fiber board, it is easy to discard.

  Although the present invention has been described in detail with reference to the illustrated embodiments, it is not intended to limit the present invention only to those embodiments, and various modifications can be made without departing from the spirit of the present invention. It goes without saying that various modifications can be made.

  The vibration damping material of the present invention can be used for a floor, wall, or ceiling of a building that needs to reduce the sound pressure level, and is particularly suitable for a floor provided on a floor surface of a building.

It is a perspective view which shows the Example of the placing floor which concerns on this invention. It is an expanded sectional view of the position where the support device in FIG. 1 was provided. It is an expanded sectional view of the damping material in an example. It is sectional drawing which shows another Example of the damping material which concerns on this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Place floor 3, 4 Damping material 5, 6 Layer including the center 7, 8 Surface layer 9, 10 Back layer 11 Thickness direction 13 Surface 14 Back surface 16 Floor finish material 18 Base material 20 Floor slab (floor base)
22 Support device (support means)

Claims (2)

The wood fiber board has an average density of 0.85 g / cm ³ to 1.05 g / cm ³ , and the density of the front and back layers of the wood fiber board is the wood fiber. A damping material formed to be smaller than the density of the layer including the center in the thickness direction of the plate.   A floor finishing material, the vibration damping material according to claim 1 provided in contact with the floor finishing material, a base material provided in contact with the vibration damping material, and the base material separated from the floor base material. And a plurality of support means for supporting the floor.

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