JP2015135017A - Sound insulation flooring and soundproof material for use in the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide sound insulation flooring that does not adversely affect the human body, which has high durability, which is tasteful, and which can obtain high soundproof performance and a good walking feeling.SOLUTION: Sound insulation flooring is characterized as follows: solid wood and a soundproof material including a buffer layer overlap each other in such a manner that the solid wood and the buffer layer adjoin each other; bending strength measured on the basis of JIS A 1408 for the solid wood falls within the range of 5-50 MPa; and compression modulus of elasticity, which is measured on the basis of JIS K 7181 for the buffer layer, is 30 kPa or less.

Description

  The present invention relates to a sound-insulating flooring for direct attachment that does not adversely affect the human body, has high durability, is tasteful, and has high soundproofing performance and good walking feeling, and a soundproofing material used for the soundproofing flooring.

  As a flooring material for multi-storey buildings such as condominiums, buildings, and general houses, flooring materials that have sound insulation (soundproofing) performance are being used to reduce floor impact noise from the upper floors. . Light impact sounds (sounds in a relatively high frequency range) such as the impact sound generated by dropping a spoon or tableware or walking with a slipper, etc. Floor materials having sound insulation performance against a wide range of impact sounds are desired.

  As a flooring material having sound insulation performance, a so-called flooring for direct attachment, in which a plurality of grooves are provided on a wooden substrate and bonded to a cushioning material, is known. The reason why the plurality of grooves are provided in the wooden substrate is to increase the bending when an object comes into contact with the floor, and thereby the sound generated on the floor surface is reduced. For example, an example in which a solid base material having a plurality of grooves formed on the back surface and a non-woven fabric having a three-layer structure as a cushioning material layer (Patent No. 5188341 (Patent Document 1)), a plurality of grooves are formed on the back surface. An example of stacking a wood substrate and a plastic sheet having a plurality of grooves formed at positions different from the grooves of the wood substrate (Japanese Patent Laid-Open No. 2001-107543 (Patent Document 2)), forming grooves on both front and back surfaces An example (Japanese Patent Application Laid-Open No. 2005-90090 (Patent Document 3)) in which the plate material is sandwiched between damping sheets formed in a surface shape that fits into the groove of the plate material, and the wooden base material and the wooden surface material are elastic. An example in which cuts are formed in a wood surface material and an intermediate sheet (Japanese Patent Laid-Open No. 2002-30793 (Patent Document 4)), a decorative layer, a base material layer, a sound insulating layer, and a moisture-proof layer are laminated. The moisture barrier As the number of degrees and the groove is a particular relationship, an example in which is formed a plurality of grooves in the substrate layer (JP 2010-168815 (Patent Document 5)), and the like.

  However, a simple combination of a wooden substrate with grooves and various conventional cushioning materials (especially when soft non-woven fabric is used) locally deforms the portion of the wooden substrate loaded by human walking. When the flooring subsided, I felt uncomfortable with the feeling of stepping while walking. On the other hand, when a hard back surface material is bonded to a wooden substrate without using a cushioning material, there is a problem that the soundproofing performance is remarkably lowered.

  Conventionally, a plywood (composite material) in which a plurality of single plates are bonded as a surface material has been used as a wood substrate, but (1) a large amount of adhesive is used to bond the single plates. Therefore, a large amount of harmful substances such as formaldehyde are released indoors, causing sick house syndrome. (2) The surface material is inferior in durability, and after a few years, countless small cracks occur on the surface. 3) There are problems such as lack of warmth and taste that the surface material appeals to the five senses. In recent years, solid materials tend to be preferred as surface materials for flooring materials.

  Solid wood is a base material made of a single plate, which can reduce the amount of adhesive used compared to a plywood made by bonding multiple single plates together with an adhesive. As a luxury, it has a strong popularity for properties that are naturally oriented. As an example using such a solid material, for example, the above-mentioned Patent Document 1, a surface material made of a wood-based solid material, and an example in which a foamed plastic sheet is fixed to the back surface thereof (Japanese Patent Laid-Open No. 2001-295453 (Patent) Reference 6)), solid wood is placed on the slab as a surface material via joists, a cushioning material is provided between the slab and joists, and a sound insulating material is provided between the joists and the solid wood. An example in which a sound-absorbing material is disposed in a region where no joist is present (Japanese Patent Laid-Open No. 2003-56171 (Patent Document 7)).

  However, the solid material itself does not have sound insulation performance, and since it is easy to break, even if a groove is formed for the purpose of imparting sound insulation performance, it is difficult to provide sufficient sound insulation performance.

Patent No. 5188341 JP 2001-107543 A JP-A-2005-90090 JP 2002-30793 A JP 2010-168815 A JP 2001-295453 A JP 2003-56171 A

  The present invention has been made in order to solve the above-mentioned problems, and its object is to have no adverse effects on the human body, high durability, good taste, and high soundproofing performance and good walking feeling. Is to provide sound insulation flooring.

  The present invention is a sound-insulating flooring for direct attachment in which a solid material and a soundproof material including a buffer layer are laminated so that the solid material and the buffer layer are adjacent to each other, and the JIS A 1408 is made of the solid material. The bending strength measured according to the standard is in the range of 5 to 50 MPa, and the compression elastic modulus measured according to JIS K 7181 of the buffer layer is 30 kPa or less.

  In the sound insulation flooring of the present invention, the sound insulating material preferably includes a vibration damping layer, and the vibration damping layer is more preferably an asphalt sheet.

  In the sound insulation flooring of the present invention, the buffer layer included in the soundproofing material is preferably a non-woven fiber structure, and more preferably the non-woven fiber structure contains wet heat adhesive fibers.

  The present invention also provides a soundproofing material used in the above-described sound insulation flooring of the present invention.

  According to the present invention, the above-described effects can be obtained by combining with sound insulation flooring that does not adversely affect the human body, is highly durable, tasteful, and has high soundproof performance and good walking feeling, and solid wood. It is possible to provide a soundproofing material capable of obtaining soundproofing flooring.

FIG. 1A and FIG. 1B are perspective views schematically showing a sound insulation flooring 1 of a preferred example of the present invention. It is a disassembled perspective view of the sound insulation flooring 1 shown to FIG. 1 (A). It is sectional drawing of the sound insulation flooring 1 shown to FIG. 1 (A). It is a perspective view which shows typically the sound insulation flooring 11 of the other preferable example of this invention. It is a disassembled perspective view of the sound insulation flooring 11 shown in FIG. It is sectional drawing of the sound insulation flooring 11 shown in FIG.

  1 (A) and 1 (B) are perspective views schematically showing a sound insulation flooring 1 of a preferred example of the present invention (FIGS. 1 (A) and 1 (B) are from opposite sides of a solid material on a diagonal line). FIG. 2 is an exploded perspective view of the sound insulation flooring 1 shown in FIG. 1 (A), and FIG. 3 is a cross-sectional view of the sound insulation flooring 1 shown in FIG. 1 (A). 1 to 3 includes a basic structure in which a solid material 2 and a soundproof material 3 including a buffer layer 4 are stacked so that the solid material 2 and the buffer layer 4 are adjacent to each other.

  The solid material 2 in the sound insulation flooring 1 of the present invention constitutes a surface plate of the sound insulation flooring 1, has a beautiful grain and color tone, and is excellent in durability and heat insulation. Further, unlike the plywood that constitutes the surface material of the conventional floor finishing material, no harmful substances such as formaldehyde are diffused into the room, which makes it suitable for the recent nature and health orientation.

  The sound insulation flooring 1 of the present invention is characterized by using a solid material 2 having a bending strength measured in accordance with JIS A 1408 in the range of 5 to 50 MPa, preferably in the range of 10 to 30 MPa. . When using a solid material with a bending strength of less than 5 MPa, the sinking during walking is large and a good feeling of walking cannot be obtained, and it is cracked by the impact when a person walks or falls. In addition, when a solid material having a bending strength exceeding 50 MPa is used, there is a small amount of bending, so that the impact cannot be buffered and sufficient sound insulation may not be obtained. The sound-insulating flooring 1 of the present invention is configured such that a buffer layer 4 having a compression elastic modulus within a specific range, which will be described later, is configured so as to be adjacent to the solid material 2, so that the solid material alone has sound insulation performance. In comparison, it is not necessary to increase the deflection so much, and therefore the degree of groove processing for that purpose is also small. For this reason, the solid material 2 itself has a natural and tasteful taste without being subjected to grooving for bending the solid material 2 to such an extent that cracking is likely to occur. Sufficient sound insulation performance and good walking feeling can be achieved at the same time.

  The wood planing of the surface plate includes, for example, a cross-cut wood cutting in which the fiber direction (the trunk axis direction of the wood) is the long side and the square direction (the radial ring radial direction of the wood) is short. On the back side of the solid material 2 (side adjacent to the buffer layer 4), there are grooves (vertical grooves) 2a drilled substantially parallel to the fiber direction and grooves (horizontal grooves) 2b drilled substantially perpendicular to the fiber direction. Drilled in a lattice shape. Accordingly, the solid material 2 can be bent and an air layer can be formed by the grooves 2a and 2b, so that the soundproofing performance is improved.

  The bending strength of the solid material 2 can be adjusted by appropriately changing the width and depth of the groove, for example. The depth of the groove 2a drilled substantially parallel to the fiber direction of the solid material 2 is such that the solid material 2 has a bending strength within a specific range and a desired sound insulation performance is obtained. It is preferably 3/10 to 9/10. The strength of the wood in the grid direction is as small as about 1/10 to 1/15 of the strength in the fiber direction (anisotropy of wood strength), and further increasing the depth of the groove 2a is just small in the grid direction. This is because the strength is further reduced, and the strength is still unfavorable even considering the soundproofing performance and the heat retention efficiency. In addition, since the expansion / contraction ratio in the grid direction of wood is 5 to 20 times the expansion / contraction ratio in the fiber direction, the groove 2a also plays a role of preventing the solid material 2 from warping in a concave shape in the grid direction.

  On the other hand, the depth of the groove 2b drilled substantially perpendicular to the fiber direction of the solid material 2 is such that the solid material has a bending strength within a specific range and a desired sound insulation performance is obtained. The thickness is desirably 3/10 to 9/10. Due to the anisotropy of the wood strength, there is no problem in strength even if the depth of the groove 2b is made larger than that of the groove 2a. Rather, the volume of the air layer is increased by increasing the depth of the groove 2b. This is to improve the soundproofing performance.

  For both the groove 2a and the groove 2b, the width of the groove is preferably in the range of 1 to 5 mm, and in the range of 2 to 3 mm from the viewpoint of preventing the surface plate from being cracked due to stress concentration. Is more preferable.

  The grooves 2a and 2b formed on the back side of the solid material 2 are measured in accordance with JIS A 1408 because there is a problem that the solid material 2 is liable to break if the depth, width, etc. are changed significantly. In order to obtain the solid material 2 whose bending strength is within the specific numerical range described above, the pitch (the linear distance between the substantially parallel adjacent grooves) forming the grooves 2a and 2b is one of the major factors. Become. As will be described later, the material used for the solid material 2 and the thickness of the solid material 2 are also affected. For example, when a solid material made of cedar having a thickness of 12 mm is used, the pitch of the grooves 2 a and 2 b having a width of 3 mm and a depth of 6 mm. Is preferably in the range of 5 to 50 mm, and more preferably in the range of 10 to 15 mm. In addition, the groove 2a and the groove 2b may have the same or different width, depth, shape, and pitch as long as the bending strength measured in accordance with JIS A 1408 is within the above range. Of course, the width, depth, shape, and the like may be different between the plurality of grooves 2a and the grooves 2b along the same direction.

  The thickness of the solid material 2 is not particularly limited, but is preferably 3 to 30 mm, and more preferably 5 to 20 mm. This is because when the thickness is less than 3 mm, the load resistance is small, and when the thickness is more than 30 mm, the bending is small and sufficient sound insulating properties tend not to be obtained.

  The material (wood) that forms the solid material 2 is not particularly limited, and for example, cedar, oak, birch, cypress, hippopotamus, pine, oak, zelkova, beech, teak, tagaya sun, karin, walnut, maple, pine Various known materials can be suitably used.

  The solid material 2 in the sound insulation flooring 1 of the present invention has a convex portion 5a on one side along the fiber direction and a concave portion 5b on the other side, as in the example shown in FIGS. When formed and used in combination with a plurality of sound-insulating flooring 1, they are arranged substantially parallel to the fiber direction so that no gap is formed on the surface of the solid material 2 in a state where the convex portions 5 a and the concave portions 5 b are fitted to each other. It may be configured to be able to. Similarly, a convex portion 6a is formed on any one side portion along the grid direction of the solid material 2, and a concave portion 6b is formed on the other side portion. When the plurality of sound insulation flooring 1 is used in combination, the convex portion In a state in which the 6a and the recess 6b are fitted to each other, the gap may be formed on the surface of the solid material 2 so as to be arranged substantially parallel to the grid direction.

  In the sound insulation flooring 1 of the present invention, the soundproof material 3 having the buffer layer 4 is laminated on the solid material 2 as described above so that the buffer layer 4 is adjacent to the solid material 2. The sound insulation flooring 1 of the present invention is characterized in that the buffer layer 4 has a compressive elastic modulus measured in accordance with JIS K 7181 of 30 kPa or less, preferably 20 kPa or less. When the buffer layer 4 having a compression elastic modulus exceeding 30 kPa is used, there is a strong repulsion against the bending of the flooring material and there is a tendency that sufficient sound insulation is not obtained. Further, from the viewpoint of obtaining a good walking feeling, the buffer layer 4 used in the sound insulating flooring 1 of the present invention preferably has a compression elastic modulus of 5 kPa or more, and more preferably 10 kPa or more.

  The soundproofing material 3 in the present invention may be composed of only the buffer layer 4 as in the example shown in FIGS. 1 to 3, and another layer (for example, a vibration damping layer described later) is laminated on the buffer layer 4. It may be a configuration.

  The buffer layer 4 is disposed in the floor structure in order to improve the sound insulation of the floor impact sound, and is composed of a plate-like or sheet-like material having elasticity and shock absorption, and the compression elastic modulus described above. As long as it satisfies the above conditions, there is no particular limitation, and a plastic foam (for example, foamed styrene, foamed urethane, foamed polyolefin, etc.), rubber or elastomer, and a fiber structure (woven / knitted fabric, nonwoven fabric, etc.) And the like having a buffering action can be used.

  The thickness of the buffer layer 4 is preferably 2 mm or more in order to express the sound insulation performance of floor impact sound. In addition, from the viewpoint of minimizing the level difference from the floor height in a portion where no sound insulation flooring is applied in the same building, the thickness of the buffer layer 4 is preferably 15 mm or less. The thickness of the buffer layer 4 is more preferably in the range of 2.5 to 10 mm, and still more preferably in the range of 3 to 8 mm. In the present invention, by using the buffer layer 4 having such a thickness, sufficient sound insulation performance can be exhibited, the strength of the floor can be secured, and sinking during walking can be suppressed.

  As the buffer layer in the present invention, among the above-mentioned, it has moderate voidability and excellent sound absorption, and particularly can absorb sound waves in a high frequency range, so that the comfort in the lower floor can be improved. Therefore, a nonwoven fiber structure is preferable. Non-woven fiber structures include, for example, molding in which nonwoven fabrics are fixed by mechanical compression treatment (needle punch, etc.), partial hot-pressure fusion treatment (hot embossing, etc.), adhesion or fusion treatment with a binder component, etc. The body is mentioned. Examples of fibers constituting the nonwoven fabric include polyolefin fibers, (meth) acrylic fibers, polyvinyl alcohol fibers, vinyl chloride fibers, styrene fibers, polyester fibers, polyamide fibers, polycarbonate fibers, and polyurethane fibers. Etc. Of these fibers, polyester fibers, polyamide fibers, or composite fibers containing these fibers are widely used.

Examples of the polyester resin constituting the polyester fiber include aromatic polyester resins such as poly C _2-4 alkylene arylate resins (polyethylene terephthalate (PET), polytrimethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, etc.), In particular, a polyethylene terephthalate resin such as PET is preferable. In addition to the ethylene terephthalate unit, the polyethylene terephthalate-based resin includes other dicarboxylic acids (for example, isophthalic acid, naphthalene-2,6-dicarboxylic acid, phthalic acid, 4,4′-diphenyldicarboxylic acid, bis (carboxyphenyl) ethane, 5-sodium sulfoisophthalic acid, etc.) and diols (eg, diethylene glycol, 1,3-propanediol, 1,4-butanediol, 1,6-hexanediol, neopentyl glycol, cyclohexane-1,4-dimethanol, polyethylene glycol , Polytetramethylene glycol and the like) may be included at a ratio of about 20 mol% or less.

  Polyamide resins constituting the polyamide fibers include aliphatic polyamides such as polyamide 6, polyamide 66, polyamide 610, polyamide 10, polyamide 12, and polyamide 6-12, and copolymers thereof, aromatic dicarboxylic acids and aliphatic diamines. A semi-aromatic polyamide synthesized from these is preferred. These polyamide-based resins may also contain other copolymerizable units.

  The average fineness of the fibers constituting the nonwoven fiber structure is not particularly limited, but is preferably within a range of 0.01 to 100 dtex from the viewpoint of realizing good sound insulation performance and sound absorption performance, More preferably, it is in the range of 0.1 to 50 dtex, and particularly preferably in the range of 0.5 to 30 dtex.

The compression modulus of the nonwoven fiber structure has a correlation with the apparent density of the nonwoven fiber structure. In order to obtain a buffer layer having a compression elastic modulus within the above-mentioned range, it is preferably within the range of 0.02 to 0.08 g / cm ³ , more preferably within the range of 0.025 to 0.07 g / cm ³ . It is particularly preferable to use a relatively low density non-woven fibrous structure in the range of 0.03 to 0.06 g / cm ³ . When the apparent density of the non-woven fiber structure is less than 0.02 g / cm ³ , the sound insulation performance is improved, but the walking feeling tends to decrease due to the decrease in hardness, and 0.08 g If it exceeds / cm ³ , the sound insulation performance tends to deteriorate. The apparent density of the nonwoven fiber structure can be adjusted by controlling the total weight of the fibers used. In order to obtain a nonwoven fiber structure having an apparent density within the above-mentioned range, a predetermined density is required. The fiber amount may be adjusted in accordance with the weight per unit area calculated from the apparent density and thickness (g / m ² ).

There is no particular limitation on the basis weight of the nonwoven fiber structure is preferably in the range of 100~5000g / ^{m 2,} more preferably in the range of 200~3000g / ^{m 2,} 300~2000g / and particularly preferably in the range of m ^2. If the basis weight of the non-woven fiber structure is less than 100 g / m ² , it tends to be difficult to ensure the hardness, and if it exceeds 5000 g / m ² , the web is too thick and wet heat processing. In this case, high-temperature steam cannot sufficiently enter the web, and it tends to be difficult to obtain a uniform structure in the thickness direction.

  The non-woven fiber structure (or fiber) is further added to a conventionally known appropriate additive, for example, a stabilizer (a heat stabilizer such as a copper compound, an ultraviolet absorber, a light stabilizer, an antioxidant, etc.), a dispersant, Thickeners, fine particles, colorants, antistatic agents, flame retardants, plasticizers, lubricants, crystallization rate retarders, lubricants, antibacterial agents, insect and acaricides, antifungal agents, matting agents, heat storage agents, fragrances Further, it may contain a fluorescent brightening agent, a lubricant and the like. These additives may be carried on the structure surface or may be contained in the fiber.

  In the present invention, the binder component (particularly, the binder component (particularly, the polyester fiber, the polyamide fiber, the polyolefin resin, the polyvinyl alcohol resin, etc.) is used among the nonwoven fiber structures. The fiber structure is preferably fixed by fusion of the fiber), and includes a wet heat adhesive fiber from the viewpoint of achieving both sound insulation performance (particularly sound insulation performance against light floor impact sound) and strength. A structure in which fibers are fixed by fusion bonding (nonwoven fiber structure including wet heat adhesive fibers) is particularly preferable. Non-woven fiber structures containing wet heat adhesive fibers are bonded uniformly in the thickness direction in order to bond using high-temperature (superheated or heated) water vapor, ensuring high strength while maintaining the fiber structure To do.

The wet heat adhesive fiber is configured to include at least a wet heat adhesive resin that can flow or easily change to exhibit an adhesive function at a temperature that can be easily realized by high-temperature steam. Specifically, a thermoplastic resin that is softened with hot water (for example, 80 to 120 ° C., particularly 95 to 100 ° C.) and can be self-adhered or bonded to other fibers, such as an ethylene-vinyl alcohol copolymer. And vinyl alcohol polymers, polylactic acid resins such as polylactic acid, and (meth) acrylic copolymers containing (meth) acrylamide units. Furthermore, it may be an elastomer (for example, polyolefin elastomer, polyester elastomer, polyamide elastomer, polyurethane elastomer, styrene elastomer, etc.) that can be easily fluidized or deformed by high-temperature steam. These wet heat adhesive resins can be used alone or in combination of two or more. Of these, vinyl alcohol polymers containing α-C _2-10 olefin units such as ethylene and propylene, particularly ethylene-vinyl alcohol copolymers are preferred.

  In the ethylene-vinyl alcohol copolymer, the ethylene unit content (copolymerization ratio) is not particularly limited, but is preferably in the range of 5 to 65 mol%, and 20 to 55 mol%. More preferably, it is in the range of 30 to 50 mol%. When the ethylene unit is within this range, a unique property of having wet heat adhesiveness but not hot water solubility is obtained. When the proportion of the ethylene unit is too small, the ethylene-vinyl alcohol copolymer easily swells or gels with low-temperature steam (water), and its form is easily changed only by being wetted with water at one time. On the other hand, when the proportion of ethylene units is too large, the hygroscopicity is lowered, and fiber fusion due to wet heat becomes difficult to be exhibited, so that it is difficult to ensure practical strength. When the ratio of the ethylene unit is particularly in the range of 30 to 50 mol%, there is an advantage that it is easy to process into a sheet or plate.

  The saponification degree of the vinyl alcohol unit in the ethylene-vinyl alcohol copolymer is not particularly limited, but is preferably in the range of 90 to 99.99 mol%, and 95 to 99.98 mol%. More preferably, it is in the range of 96 to 99.97 mol%. When the saponification degree of the vinyl alcohol unit is less than 90 mol%, the thermal stability is lowered, and the stability is lowered due to thermal decomposition or gelation. On the other hand, when the degree of saponification of the vinyl alcohol unit exceeds 99.99 mol%, it is difficult to produce the fiber itself.

  The viscosity average degree of polymerization of the ethylene-vinyl alcohol copolymer can be selected as necessary, but is preferably in the range of 200 to 2500, more preferably in the range of 300 to 2000, and 400 to It is particularly preferred that it is in the range of 1500. When the degree of polymerization is in the range of 200 to 2500, there is an advantage that the balance between spinnability and wet heat adhesion is excellent.

  The cross-sectional shape (cross-sectional shape perpendicular to the length direction of the fiber) of wet heat adhesive fibers is limited to general solid cross-sectional shapes such as round cross-sections and irregular cross-sections (flat, elliptical, polygonal, etc.) It may not be a hollow cross-sectional shape. The wet heat adhesive fiber may be a composite fiber composed of a plurality of resins including at least a wet heat adhesive resin. The composite fiber only needs to have a wet heat adhesive resin on at least a part of the fiber surface, but from the viewpoint of adhesiveness, it is preferable to have a wet heat adhesive resin continuous in the length direction on the fiber surface. The coverage of the wet heat adhesive fiber is not particularly limited, but is preferably 50% or more, more preferably 80% or more, and particularly preferably 90% or more.

  Examples of the cross-sectional structure of the composite fiber in which the wet heat adhesive resin occupies the surface include a core-sheath type, a sea-island type, a side-by-side type, a multi-layer bonding type, a radial bonding type, and a random composite type. Among these cross-sectional structures, a core-sheath structure in which the wet heat adhesive resin covers the entire surface of the fiber (that is, the sheath portion is made of the wet heat adhesive resin because it is a structure with high adhesiveness. A core-sheath structure) is preferred. The core-sheath structure may be a fiber in which a wet heat adhesive resin is coated on the surface of a fiber composed of another fiber-forming polymer.

  In the case of a composite fiber, wet heat adhesive resins may be combined with each other, but may be combined with non-wet heat adhesive resins. Non-wet heat adhesive resins include water-insoluble or hydrophobic resins such as polyolefin resins, (meth) acrylic resins, vinyl chloride resins, styrene resins, polyester resins, polyamide resins, polycarbonate resins, polyurethanes Resin, thermoplastic elastomer and the like. These non-wet heat adhesive resins can be used alone or in combination of two or more.

  Among these non-wet heat adhesive resins, from the viewpoint of heat resistance and dimensional stability, resins having a melting point higher than that of wet heat adhesive resins (particularly ethylene-vinyl alcohol copolymers), such as polypropylene resins and polyester resins Resins and polyamide resins, particularly polyester resins and polyamide resins are preferred from the standpoint of excellent balance between heat resistance and fiber-forming properties. Polyester resins include terephthalic acid, isophthalic acid, naphthalene-2,6-dicarboxylic acid, phthalic acid, α, β- (4-carbophenoxy) ethane, 4,4-dicarboxydiphenyl, 5-sodium sulfoisophthalic acid, etc. Aromatic dicarboxylic acids, azelaic acid, adipic acid, sebacic acid and other aliphatic dicarboxylic acids or their esters, ethylene glycol, diethylene glycol, 1,3-propanediol, 1,4-butanediol, 1,6-hexane Examples thereof include fiber-forming polyester resins composed of diols such as diol, neopentyl glycol, cyclohexane-1,4-dimethanol, polyethylene glycol, and polytetramethylene glycol. More than 80 mol% of the structural units are ethylene terephthalate. single Is preferred. Examples of the polyamide-based resin include aliphatic polyamides mainly composed of nylon 6, nylon 66, and nylon 12, and polyamides containing a small amount of the third component may be used.

  In the case of a composite fiber composed of a wet heat adhesive resin and a non-wet heat adhesive resin (fiber-forming polymer), the ratio (mass ratio) of both can be selected according to the structure (for example, core-sheath structure). The wet heat adhesive resin is not particularly limited as long as it exists on the surface, but the wet heat adhesive resin / non-humid heat adhesive resin is preferably 90/10 to 10/90, and preferably 80/20 to 15/85. Is more preferable, and 60/40 to 20/80 is particularly preferable. If the proportion of wet heat adhesive resin is too large, it will be difficult to ensure the strength of the fiber, and if the proportion of wet heat adhesive resin is too small, it will be difficult to make the wet heat adhesive resin continuously in the length direction of the fiber surface. Thus, the wet heat adhesiveness is lowered. This tendency is the same when the wet heat adhesive resin is coated on the surface of the non-wet heat adhesive fiber.

  The average fiber length of the wet heat adhesive fiber is not particularly limited, but is preferably in the range of 10 to 100 mm, more preferably in the range of 20 to 80 mm, and in the range of 25 to 75 mm. Particularly preferred. When the average fiber length is in the range of 10 to 100 mm, the fibers are sufficiently entangled, so that the mechanical strength of the fiber structure is improved.

  The crimp rate of the wet heat adhesive fiber is not particularly limited, but is preferably in the range of 1 to 50%, more preferably in the range of 3 to 40%, and in the range of 5 to 30%. It is particularly preferred. The number of crimps of the wet heat adhesive fiber is not particularly limited, but is preferably in the range of 1 to 100 pieces / 25 mm, more preferably in the range of 5 to 50 pieces / 25 mm, A range of 30/25 mm is particularly preferable.

  The nonwoven fiber structure may further contain non-wet heat adhesive fibers in addition to the wet heat adhesive fibers. Examples of the non-wet heat adhesive fibers include cellulose fibers (for example, rayon fibers, acetate fibers, etc.) in addition to the fibers formed of the non-humid heat adhesive resin constituting the composite fiber. These non-wet heat adhesive fibers can be used alone or in combination of two or more. These non-wet heat adhesive fibers can be used alone or in combination of two or more. These non-wet heat adhesive fibers can be selected according to the target properties, and when combined with semi-synthetic fibers such as rayon, a fiber structure having relatively high density and high mechanical properties can be obtained.

  The ratio (mass ratio) of the wet heat adhesive fiber and the non-wet heat adhesive fiber is not particularly limited, but the wet heat adhesive fiber / non-wet heat adhesive fiber = 100/0 to 20/80. Preferably, it is 100/0 to 50/50, more preferably 100/0 to 70/30. When the ratio of wet heat adhesive fibers is too small, the hardness is lowered, and it may be difficult to maintain the handleability as a fiber structure.

  From the viewpoint that the non-woven fiber structure containing wet heat adhesive fibers has a high degree of freedom of each fiber and can express high sound insulation properties, the wet heat adhesive fibers of the fibers constituting the non-woven fiber structure are fused. Is preferably in the range of 3 to 85%, more preferably in the range of 5 to 50%, and particularly preferably in the range of 6 to 35%. Here, the “fiber adhesion rate” indicates the ratio of the number of cross sections of two or more fibers bonded to the number of cross sections of all the fibers in the cross section of the nonwoven fiber structure. Therefore, a low fiber adhesion rate means that a ratio of a plurality of fibers fused to each other (a ratio of fibers fused by fusing) is small.

  The fibers constituting the non-woven fiber structure are bonded at the contact points of the respective fibers, but in order to develop a large bending stress with as few contacts as possible, the bonding points are formed along the thickness direction. It is preferable that the structure is uniformly distributed from the surface of the structure to the inside (center) and the back surface. When the adhesion points are concentrated on the surface or inside, it is difficult not only to ensure excellent mechanical properties and moldability, but also the shape stability in the portion where the adhesion points are small.

  Therefore, in the cross section in the thickness direction of the non-woven fiber structure, it is preferable that the fiber adhesion rate in each region divided in three in the thickness direction is within the above range. Furthermore, the ratio of the minimum value to the maximum value of the fiber adhesion rate in each region (minimum value / maximum value) (ratio of the minimum region to the region with the maximum fiber adhesion rate) is preferably 50% or more, more preferably 55. -99%, particularly preferably 60-98%. Non-woven fiber structure with excellent hardness, bending strength, folding resistance and toughness, despite the low bonding area of the fibers, because the fiber adhesion rate has such uniformity in the thickness direction You can get a body. In addition, the non-woven fiber structure as described above bends without being bent when it is gradually bent, and further retains without causing an extreme load drop even if it is bent beyond the point showing the maximum bending load. In addition, it has a property (hardness to break) that tends to be restored when the load is released and that a clear crease with permanent distortion hardly occurs. Further, since the bonding area of the fibers is low, there are many fibers that can vibrate freely and have excellent vibration and sound absorption properties.

  Nonwoven fibrous structures comprising wet heat adhesive fibers are based on webs obtained using staple fibers (eg, semi-random webs, parallel webs, etc.) as described in WO 2007/116676. And high temperature steam at a temperature of 70 to 150 ° C. (more preferably 80 to 120 ° C.) at a pressure of 0.1 to 2 MPa (more preferably 0.2 to 1.5 MPa).

  As described above, the present invention can realize a flooring having a sound insulation performance using a solid material as a surface material by combining a solid material grooved so as not to break with a buffer layer having appropriate elasticity. . In other words, it is possible to provide a sound-insulating flooring that achieves both a moderate stepping comfort and sound insulation of solid wood, has no adverse effects on the human body, is highly durable, tasteful, and has high sound insulation performance and good walking feeling. it can.

  In addition, the buffer layer in this invention may be formed only from the above-mentioned nonwoven fiber structure, and may be provided with the other layer which has a buffering effect other than a nonwoven fiber structure. The sound insulation flooring of the present invention is characterized in that the solid material and the buffer layer are laminated so as to be adjacent to each other. However, the above-mentioned nonwoven fiber structure may be directly adjacent to the solid material, Of course, another layer having a buffering action may be interposed between the solid material and the above-described nonwoven fiber structure as long as the effects of the invention are not impaired. As another layer having a buffering action other than the non-woven fiber structure, for example, at least any of the above-described examples of the buffer layer can be suitably used.

  In the sound insulation flooring 1 of the present invention, the solid material 2 and the buffer layer 4 are fixed using an adhesive or a pressure-sensitive adhesive. When another layer having a buffering action other than the non-woven fiber structure is interposed between the solid material 2 and the non-woven fiber structure, the layer and the solid material 2 and the layer and the non-woven material The fiber structure is fixed using an adhesive or a pressure-sensitive adhesive. The adhesive or pressure-sensitive adhesive is not particularly limited, and a suitable one of known adhesives and pressure-sensitive adhesives is appropriately selected according to the material of the solid material to be fixed, the non-woven fiber structure, or the other layer. Just choose. Adhesives include, for example, natural polymer adhesives such as starch and casein, vinyl adhesives such as polyvinyl acetate, thermoplastic adhesives such as acrylic adhesives, polyester adhesives, and polyamide adhesives. Examples include, but are not limited to, an adhesive, a thermosetting resin adhesive such as an epoxy resin, and the like. The pressure-sensitive adhesive is not limited to this, but includes thermoplastic resin-based pressure-sensitive adhesives such as rubber-based pressure-sensitive adhesives and acrylic pressure-sensitive adhesives.

  The sound insulation flooring 1 of the present invention is used as a so-called “direct pasting” which is performed on a floor base material using an adhesive or a pressure-sensitive adhesive. The floor base material may be, for example, a concrete slab or lightweight foamed concrete in a reinforced concrete building, or a wooden floor used in a general wooden house. The adhesive or pressure-sensitive adhesive used for direct attachment is not particularly limited, and a suitable one may be appropriately selected from known adhesives and pressure-sensitive adhesives according to the material of the floor base material.

  4 is a perspective view schematically showing a sound insulation flooring 11 according to another preferred embodiment of the present invention, FIG. 5 is an exploded perspective view of the sound insulation flooring 11 shown in FIG. 4, and FIG. 6 is a sound insulation sound shown in FIG. It is sectional drawing of the flooring 11. FIG. In the sound insulation flooring of the present invention, the sound insulation material 12 may include a vibration damping layer 13 in addition to the buffer layer 4, as in the sound insulation flooring 11 of the example shown in FIGS. The sound insulation flooring 11 in the examples shown in FIGS. 4 to 6 is the same as the sound insulation flooring 1 shown in FIGS. 1 to 3 except that the sound insulating material 12 includes the vibration damping layer 13, and the parts having the same configuration are the same. The description is abbreviate | omitted and attached | subjected. When the damping layer 13 is further provided, the damping layer 13 is disposed on the side of the buffer layer 4 opposite to the side adjacent to the solid material 2.

  The damping layer 13 is arranged to reduce the vibration from the floor impact source by the damping effect and improve the sound insulation performance of the floor impact sound, and particularly if the floor impact sound in a wide frequency range can be insulated. Although not limited, a damping material having a high density and a high specific gravity is used.

As the damping material, a mixture of a binder component and a filler is usually used. Examples of the binder component include bituminous substances such as asphalt, synthetic resins, rubbers, and elastomers. In order for the binder component to exhibit a damping effect, it is usually preferable that the mass per unit area is 4 kg / m ² or more. From the viewpoint of having such a bulk specific gravity, the binder component contains asphalt. Is preferred. The asphalt is not particularly limited, and general asphalt, for example, petroleum asphalt such as natural asphalt, straight asphalt, blown asphalt, and the like can be used. These asphalts can be used alone or in combination of two or more.

  Further, the binder component may contain a soft resin or an elastomer component in addition to asphalt in order to impart flexibility to the vibration damping material. Examples of the soft resin or elastomer component include polyolefin, vinyl polymer (polyvinyl chloride, ethylene-vinyl acetate copolymer, ethylene-vinyl alcohol copolymer, ethylene-acrylic acid copolymer, ethylene-methyl acrylate). Copolymer, ethylene-ethyl acrylate copolymer, etc.), polyamide, polyester, synthetic rubber (polybutadiene, polyisoprene, styrene-butadiene copolymer, etc.), natural rubber, rosin resin (natural rosin, modified rosin, etc.) Etc. These soft resins or elastomer components can be used alone or in combination of two or more. Of these soft resins or elastomer components, styrene-diene copolymers such as styrene-butadiene block copolymers are preferred.

  In the damping material containing asphalt, the ratio of the soft resin or elastomer component is 0 to 100 parts by weight, preferably 1 to 80 parts by weight, and more preferably 3 to 50 parts by weight with respect to 100 parts by weight of asphalt.

  The filler may be an organic filler, but is preferably an inorganic filler from the viewpoint of high specific gravity. Examples of the inorganic filler include metal particles (powder) such as iron, copper, tin, zinc, nickel, and stainless steel, iron oxide, iron sesquioxide, triiron tetroxide, ferrite, tin oxide, zinc oxide, zinc white, Metal oxide particles such as copper oxide and aluminum oxide, metal salt particles such as barium sulfate, potassium nitrate, aluminum sulfate, calcium sulfite, calcium carbonate, calcium bicarbonate, barium carbonate, magnesium hydroxide, steelmaking slag, mica, clay, talc , Mineral particles such as wollastonite, diatomaceous earth, silica sand, and pumice sand.

  These inorganic fillers can be used alone or in combination of two or more. Among these inorganic fillers, iron particles, various iron oxide particles, steelmaking slag particles, (heavy) calcium carbonate particles and the like are preferable.

  Examples of the shape of the inorganic filler include a particle shape or a powder shape, an indefinite shape, a fiber shape, and the like, but a particle shape or a powder shape is preferable. The average particle diameter of the inorganic filler is, for example, 0.01 to 0.5 mm, preferably 0.05 to 0.2 mm. Use of such a finely divided inorganic filler improves molding processability when producing a vibration damping material and allows a large amount of inorganic filler to be uniformly dispersed and blended in the asphalt base material. The surface density and thermal stability of the vibration material can be improved.

The proportion of the inorganic filler is 100 to 2000 parts by weight, preferably 200 to 1800 parts by weight, and more preferably 300 to 1500 parts by weight with respect to 100 parts by weight of asphalt. If the amount of the inorganic filler is too small, the vibration-damping and sound-insulating effect is lowered. On the other hand, if the amount is too large, the whole becomes brittle and difficult to mold, and workability is lowered. The areal density of the damping material is preferably adjusted to be 4.0 kg / ^{m 2} or more (in particular 8.0 kg / ^{m 2} or higher).

  The damping material is not particularly limited, and can be obtained by a method in which a binder component and an inorganic filler are mixed by heating and formed into a plate shape. When blending a soft resin or an elastomer component, an inorganic filler may be added to a mixture in which asphalt and a soft resin or an elastomer component are mixed in advance.

  The shape of the vibration damping material is preferably a plate shape or a sheet shape from the viewpoint of workability and the like, but may be an irregular vibration damping material such as a semi-solid shape. A commercially available asphalt sheet is a suitable example of the vibration damping layer.

  The thickness of the damping layer is, for example, 1 to 20 mm, preferably 3 to 15 mm, and more preferably 4 to 12 mm.

  The specific gravity of the damping layer is, for example, 2.2 to 3.6, preferably 2.3 to 3.5, and more preferably 2.4 to 3.4.

  The vibration damping layer can effectively reduce the floor impact sound by disposing the vibration damping layer having a sound insulation effect for a wide frequency range including the superimposed floor impact sound close to the floor. .

  Of course, the sound insulation flooring of the present invention may include components other than the above-described solid material, buffer layer, and damping layer as long as the effects of the present invention are not impaired.

  The present invention also provides soundproofing materials 3 and 12 used for the above-described sound insulation flooring 1 and 11. As described above, the soundproofing materials 3 and 12 of the present invention are provided by the buffer layer 4 alone or a laminate of the buffer layer 4 and the vibration damping layer 13, and are used in combination with the solid material 2 as described above. In addition, the sound insulation flooring 1 and 11 that exhibits the effect can be suitably realized.

<Example 1>
(1) Solid wood 12mm thick cedar solid wood (8.3cm x 91.5cm) on the back of a rectangular (groove cross-sectional shape) width 3mm, depth 6mm vertical groove and horizontal groove each with a pitch of 12mm Formed. The bending strength was measured in accordance with JIS A 1408 and found to be 12.5 MPa.

(2) Buffer layer A core sheath in which the core component is polyethylene terephthalate and the sheath component is an ethylene-vinyl alcohol copolymer (ethylene content: 44 mol%, saponification degree: 98.4 mol%) as wet heat adhesive fibers. Type composite staple fiber (“Sofista”, manufactured by Kuraray Co., Ltd.), fineness: 3.3 dtex, fiber length: 51 mm, core-sheath mass ratio = 50/50, number of crimps: 21/25 mm, crimp ratio: 13. 5%).

Using this core-sheath type composite staple fiber, a card web having a basis weight of about 100 g / m ² was prepared by a card method, and two sheets of this web were stacked to form a card web having a total basis weight of about 200 g / m ² .

  The card web was transferred to a belt conveyor equipped with a 50 mesh, 500 mm wide stainless steel endless net. In addition, the belt conveyor which has the same metal mesh is equipped in the upper part of the metal mesh of this belt conveyor, and each used the belt conveyor which can adjust the space | interval of these metal meshes arbitrarily, rotating in the same direction at the same speed. .

  Next, the card web is introduced into a steam spraying device provided in the lower conveyor, and steam treatment is performed by ejecting high-temperature steam of 0.2 MPa from the device in the thickness direction of the card web (perpendicularly). As a result, a molded body having a non-woven fiber structure was obtained. In this steam spraying device, a nozzle is installed in the lower conveyor so as to spray high-temperature steam toward the web via a conveyor net, and a suction device is installed in the upper conveyor. Further, another jetting device, which is a combination of the arrangement of the nozzle and the suction device reversed, is installed on the downstream side in the web traveling direction of this jetting device, and steam treatment is performed on both the front and back sides of the web. did.

  In addition, the hole diameter of the water vapor | steam injection nozzle was 0.3 mm, and the vapor | steam injection apparatus with which the nozzle was arranged in 1 row at 1 mm pitch along the width direction of the conveyor was used. The processing speed is 5 m / min, and the distance (distance) between the upper and lower conveyor belts on the nozzle side and suction side is 4 mm in thickness (measured according to JIS L1913 “General Short Fiber Nonwoven Fabric Test Method”). It was adjusted so that the body was obtained. The nozzles were arranged on the back side of the conveyor belt so as to be almost in contact with the belt.

The obtained non-woven fiber structure (molded body) had a board-like form and was very hard as compared with a general nonwoven fabric. It was calculated from the above thickness measured according to JIS L1913 “General Short Fiber Nonwoven Fabric Test Method” and the basis weight (200 g / m ² ) measured according to JIS L1913 “General Short Fiber Nonwoven Fabric Test Method”. The apparent density was 0.05 g / cm ³ . Furthermore, the fiber adhesion rate was 11% on the front surface side, 10% on the center portion, and 11% on the back surface side.

  The fiber adhesion rate was calculated as follows. Using a scanning electron microscope (SEM), a photograph in which the cross section of the structure was magnified 100 times was taken. The photograph of the cross section in the thickness direction of the photographed structure is divided into three equal parts in the thickness direction, and the number of fiber cut surfaces (fiber end faces) that can be found in each of the three divided areas (front surface, inside (center), back surface) On the other hand, the ratio of the number of cut surfaces where the fibers are bonded to each other was determined. Of the total number of fiber cross-sections that can be found in each region, the ratio of the number of cross-sections in the state where two or more fibers are bonded is expressed as a percentage based on the following formula. In addition, in the part which fibers contact, there exists a part which is simply contacting, without melt | fusion, and a part which has adhere | attached by melt | fusion. However, by cutting the structure for microscopic photography, the fibers in contact with each other are separated from each other by the stress of each fiber on the cut surface of the structure. Therefore, in the cross-sectional photograph, it can be determined that the contacting fibers are bonded to each other.

Fiber adhesion rate (%) = (number of cross sections of fibers bonded two or more) / (total number of cross sections of fibers) × 100
However, for each photograph, all the fibers with a visible cross section were counted, and when the number of fiber cross sections was 100 or less, a photograph to be observed was added so that the total fiber cross section exceeded 100. In addition, the fiber adhesion rate was calculated | required about each area | region divided into three equally, and the ratio (minimum value / maximum value) of the minimum value with respect to the maximum value was also calculated | required together.

  This nonwoven fiber structure was cut into a size of 8.3 cm × 91.5 cm and used as a buffer layer. It was 15.8 kPa when the compression elastic modulus was measured about the obtained buffer layer based on JISK7181.

  The obtained solid material and the buffer layer were bonded using “XB-3011” (manufactured by Towpe Co., Ltd.) as an adhesive to obtain a sound insulation flooring for direct attachment. The obtained sound insulation flooring was directly pasted on a concrete slab as a floor base material using “KU928R” (manufactured by Konishi Co., Ltd.) as an adhesive, and the following evaluation tests were performed. The results are shown in Table 1.

[1] Sound insulation evaluation test A sound insulation evaluation test was conducted in accordance with JIS 1418-1 regarding the construction area, the position of the impact point, the placement of the microphone, and the like. The ΔL number was calculated as a relative comparison with the floor base material in the case where no sound insulation flooring was provided as 0. When the ΔL number was 15 dB or more, the sound insulation performance was good.

[2] Walking feeling Actually walking on the sound insulation flooring, sensory evaluation of walking feeling was performed. The case where the feeling of walking was good was marked as ◯, and the case where the feeling of walking was bad was marked as x.

<Example 2>
On the opposite side of the sound insulation flooring produced in Example 1 to the side adjacent to the solid material of the buffer layer, a solid material with a thickness of 4 mm and an asphalt sheet (manufactured by Nanao Industry Co., Ltd.) of the same size as the buffer layer Laminated as a damping layer. For the adhesion between the buffer layer and the damping layer, “XB-3011” (manufactured by Toupe Co., Ltd.) was used as an adhesive. Table 1 shows the results of the evaluation test performed in the same manner as in Example 1.

<Example 3>
As a solid material, an oak material (bending strength measured in accordance with JIS A 1408: 34.7 MPa) having a thickness of 3 mm, a depth of 5 mm, and a pitch groove of 12 mm and a width of 12 mm formed on the back surface was used. A sound insulation flooring was produced in the same manner as in Example 1 except that. Table 1 shows the results of the evaluation test performed in the same manner as in Example 1.

<Example 4>
On the opposite side of the sound insulation flooring produced in Example 3 to the side adjacent to the solid material of the buffer layer, a solid material of 4 mm thickness, an asphalt sheet (manufactured by Nanao Industry Co., Ltd.) of the same size as the buffer layer Laminated as a damping layer. For the adhesion between the buffer layer and the damping layer, “XB-3011” (manufactured by Toupe Co., Ltd.) was used as an adhesive. Table 1 shows the results of the evaluation test performed in the same manner as in Example 1.

<Example 5>
The production condition of the nonwoven fiber structure in Example 1 was changed such that two 70 g / m ² card webs were laminated, and the apparent density was 0.035 g / cm ³ and the basis weight was 140 g / m. ^2. A non-woven fiber structure having a thickness of 4 mm and a thickness of 8.3 cm × 91.5 cm was obtained with a fiber adhesion rate of 10% on the front surface side, 9% on the center portion, and 9% on the back surface side. The same procedure as in Example 1 was performed except that the obtained nonwoven fiber structure was used as a buffer layer. The compression elastic modulus of the buffer layer measured according to JIS K 7181 was 12.1 kPa. Table 1 shows the results of the evaluation test performed in the same manner as in Example 1.

<Example 6>
On the opposite side of the sound insulation flooring produced in Example 5 to the side adjacent to the solid material of the buffer layer, a solid material of 4 mm thickness, an asphalt sheet (manufactured by Nanao Industry Co., Ltd.) of the same size as the buffer layer Laminated as a damping layer. For the adhesion between the buffer layer and the damping layer, “XB-3011” (manufactured by Toupe Co., Ltd.) was used as an adhesive. Table 1 shows the results of the evaluation test performed in the same manner as in Example 1.

<Comparative Example 1>
The solid material produced in Example 1 was used alone (no buffer layer). Table 1 shows the results of the evaluation test performed in the same manner as in Example 1.

<Comparative Example 2>
A 12 mm thick solid cedar wood (8.3 cm × 91.5 cm) having a rectangular (groove cross-sectional shape) width of 3 mm, a depth of 9 mm, and a longitudinal groove and a lateral groove formed at a pitch of 10 mm on the back surface was used. Except this, the procedure was the same as in Example 1. The bending strength of the solid material used in Comparative Example 2 measured according to JIS A 1408 was 2.8 MPa.

<Comparative Example 3>
A 12 mm thick cedar solid material (8.3 cm × 91.5 cm) having a rectangular (groove cross-sectional shape) width of 3 mm, a depth of 3 mm, and a longitudinal groove and a lateral groove of 12 mm each on the back surface was used. Except this, the procedure was the same as in Example 1. The bending strength measured according to JIS A 1408 of the solid material used in Comparative Example 3 was 58.5 MPa.

<Comparative Example 4>
On the opposite side of the sound insulation flooring produced in Comparative Example 3 from the side adjacent to the solid material of the buffer layer, a solid material with a thickness of 4 mm and an asphalt sheet (manufactured by Nanao Industry Co., Ltd.) of the same size as the buffer layer Laminated as a damping layer. For the adhesion between the buffer layer and the damping layer, “XB-3011” (manufactured by Toupe Co., Ltd.) was used as an adhesive. Table 1 shows the results of the evaluation test performed in the same manner as in Example 1.

<Comparative Example 5>
The production condition of the nonwoven fiber structure in Example 1 was changed such that six card webs of 100 g / m ² were laminated so that the apparent density was 0.10 g / cm ³ and the basis weight was 400 g / m. ^2. Nonwoven fiber structure having a thickness of 4 mm and a thickness of 8.3 cm × 91.5 cm, with a fiber adhesion rate of 30.3% on the front side, 28.5% at the center, and 29.2% on the back side Got. The same procedure as in Example 1 was performed except that the obtained nonwoven fiber structure was used as a buffer layer. The compression elastic modulus measured according to JIS K 7181 of the buffer layer was 37.8 kPa. Table 1 shows the results of the evaluation test performed in the same manner as in Example 1.

<Comparative Example 6>
On the opposite side of the sound insulation flooring produced in Comparative Example 5 to the side adjacent to the solid material of the buffer layer, a solid material with a thickness of 4 mm and an asphalt sheet (manufactured by Nanao Industry Co., Ltd.) of the same size as the buffer layer Laminated as a damping layer. For the adhesion between the buffer layer and the vibration damping layer, “XB-3011” (manufactured by Tope Corporation) was used as an adhesive. Table 1 shows the results of the evaluation test performed in the same manner as in Example 1.

  1,11 Sound insulation flooring, 2 solid material, 2a, 2b groove, 3,12 soundproofing material, 4 buffer layer, 5a convex portion, 5b concave portion, 6a convex portion, 6b concave portion, 13 damping layer.

Claims (6)

  A sound insulation flooring for direct attachment, in which a solid material and a soundproof material including a buffer layer are laminated so that the solid material and the buffer layer are adjacent to each other, and measured in accordance with JIS A 1408 of the solid material The sound insulation flooring whose bending strength is in the range of 5-50 Mpa, and whose compression elastic modulus measured based on JISK7181 of the said buffer layer is 30 kPa or less.   The sound insulation flooring according to claim 1, wherein the sound insulating material includes a vibration damping layer.   The sound insulation flooring of Claim 1 or 2 whose buffer layer contained in the said soundproof material is a nonwoven fabric structure.   The sound-insulating flooring according to claim 3, wherein the nonwoven fibrous structure includes wet heat adhesive fibers.   The sound insulation flooring according to any one of claims 2 to 4, wherein the vibration damping layer is an asphalt sheet. The soundproof material used for the sound insulation flooring of any one of Claims 1-5.

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