JP6016503B2 - Wooden flooring and floor structure - Google Patents

Description

  The present invention relates to a wooden floor material and a floor structure which are directly attached to a reinforced concrete floor slab or the like.

  For example, in a condominium or the like, floor finishing may be performed by a direct pasting method. In the direct pasting method, a floor structure is formed by directly pasting a flooring material on a concrete slab with an adhesive or the like.

  As flooring materials used in such a direct bonding method, for example, those shown in the following Patent Documents 1 to 3 are well known.

  The flooring materials shown in Patent Documents 1 and 2 are provided with a 5-ply plywood as a base material layer, and a plurality of back grooves are formed on the back surface side of the base material layer so as to prevent warping. Yes.

  The flooring shown in Patent Document 3 includes a 5-ply plywood as a base material layer, and a plurality of back grooves are formed on the back surface side of the substrate layer, and a buffer material layer is laminated on the back surface of the base material layer, I try to improve the feeling of walking.

Japanese Patent No. 2807108 Japanese Patent No. 4821335 JP-A-8-326279

  By the way, since the conventional flooring material for direct pasting is directly pasted on the concrete slab, an impact sound such as when an article is dropped on the flooring is easily transmitted downstairs. For this reason, conventionally, in the technical field of flooring materials for direct attachment, it is strongly desired to improve the sound insulation as much as possible.

  This invention is made | formed in view of said subject, and it aims at providing the wood-type flooring material and floor structure for direct attachment excellent in sound-insulating property.

  In order to solve the above problems, the present invention comprises the following means.

[1] A plywood substrate layer constituted by a plywood in which a plurality of single plates are laminated, a decorative layer provided on the surface side of the plywood substrate layer, and provided on the back surface side of the plywood substrate layer It is a wooden flooring that has a sound insulation layer and is constructed by direct bonding,
In the plywood substrate layer, a plurality of back grooves extending in the floor material width direction and opened to the back surface side are formed at intervals in the floor material length direction,
The upper end position of the back groove is disposed in the single plate of the second layer from the top in the plywood substrate layer,
Among the plurality of single plates constituting the plywood substrate layer, the first single plate is formed to be the thinnest, and the thickness of the first single plate is set to 0.2 mm to 0.8 mm. A wooden flooring that is characterized by

  [2] The woody flooring material according to item 1 above, wherein the first single plate in the plywood base material layer is thinner than the single plate other than the first layer.

  [3] The woody flooring according to the above item 1 or 2, wherein the plywood base material layer is composed of a 5-ply plywood in which five single plates are laminated and integrated with the fiber directions alternately orthogonal.

  [4] In any one of the preceding items 1 to 3, wherein a back groove remaining thickness which is a dimension from the upper end position of the back groove to the surface position of the first layer veneer is set to 0.4 mm to 3.3 mm. The wooden flooring described.

  [5] The woody flooring material according to any one of items 1 to 4, wherein a thickness of the sound insulation layer is set to 2 mm to 6 mm.

  [6] The woody flooring material according to any one of items 1 to 5, wherein a thickness of a lowermost single plate in the plywood base material layer is set to 0.2 mm to 1.5 mm.

  [7] The woody flooring material according to any one of items 1 to 6, wherein the thickness of the plywood base material layer is set to 4 mm to 12 mm.

  [8] The woody flooring material according to any one of items 1 to 7, wherein the thickness of the entire flooring material is set to 7 mm to 15 mm.

[9] A floor structure in which a wooden floor is directly pasted on a slab floor,
The wood-based flooring includes a plywood base material layer formed of plywood in which a plurality of single plates are laminated, a decorative layer provided on the surface side of the plywood base material layer, and a back surface side of the plywood base material layer And a sound insulation layer provided in
In the plywood substrate layer, a plurality of back grooves extending in the floor material width direction and opened to the back surface side are formed at intervals in the floor material length direction,
The upper end position of the back groove is disposed in the single plate of the second layer from the top in the plywood substrate layer,
Among the plurality of single plates constituting the plywood substrate layer, the first single plate is formed to be the thinnest, and the thickness of the first single plate is set to 0.2 mm to 0.8 mm. A floor structure characterized by

  According to the woody flooring of the invention [1], as will be apparent from the examples described later, it has excellent sound insulation.

  According to each wood type floor material of invention [2]-[8], the above-mentioned effect can be acquired more certainly. In particular, according to the woody flooring of the invention [5], it is possible to reduce the thickness of the entire flooring and further improve the feeling of walking when stepped on.

  According to the floor structure of the invention [9], the same effect can be obtained as described above.

FIG. 1 is a side sectional view showing a wooden flooring according to an embodiment of the present invention. FIG. 2 is a side cross-sectional view showing a plywood substrate layer employed in the flooring of the embodiment.

  FIG. 1 is a side cross-sectional view corresponding to a cross section of a wooden floor material according to an embodiment of the present invention cut along a plane perpendicular to the floor material width direction. As shown in the figure, this flooring is constructed by directly pasting on a floor slab S such as a concrete slab.

  This flooring is laminated and integrated on the plywood substrate layer 1, the decorative layer 2 laminated and integrated on the surface side (upper surface side) of the plywood substrate layer 1, and the back surface side (lower surface side) of the plywood substrate layer 1. The sound insulation layer 3 is provided as a basic component.

  FIG. 2 is a side cross-sectional view corresponding to a cross section when the plywood base material layer 1 is cut along a plane orthogonal to the floor width direction. As shown in the figure, this plywood substrate layer 1 is constituted by a 5-ply plywood in which five single plates 11 to 15 are laminated and integrated. The single plates 11 to 15 are laminated so that the fiber directions are alternately arranged by 90 °. The first single plate (face single plate) 11 from the top, the third single plates 13 and 5 from the top. The fiber direction of the single plate (back single plate) 15 of the layer (bottom end) is arranged in parallel to the floor material length direction, and the fiber direction of the single plates 12 and 14 in the second and fourth layers from the top. Are arranged in parallel to the floor width direction.

  In the present embodiment, the face single plate 11 needs to be formed to be the thinnest among the plural (five) single plates 11 to 15 constituting the plywood base material layer 1. In the present invention, the single plate having the smallest thickness is not necessarily limited to one, and there may be two or more. For example, when the face single plate 11 and the back single plate 15 have the same thickness and the other single plates 12 to 14 are thicker than the face single plate 11 and the back single plate 15, the face single plate 11 is the back single plate 15. At the same time, it is the thinnest plate formed. That is, in the present invention, the plywood base material layer 1 is composed of a plurality of single plates whose thickness is classified into two or more types, and the face single plate is composed of a single plate classified as the thinnest type. In this case, the face single plate 11 is formed to be the thinnest among the plurality of single plates constituting the plywood substrate layer 1.

  In the present invention, when one of the two single plates having the same thickness is lightly shaved to adjust the surface, one single plate is more than the other single plate. It means that the thickness is thin. For example, when manufacturing a flooring, the face veneer 11 and the back veneer 15 have the same thickness as the plywood for the plywood substrate layer 1, and the other veneers 12 to 14 are more than the face veneer 11 and the back veneer 15. In the case where the face veneer 11 is lightly shaved to adjust its surface at any stage of the flooring manufacturing process, for example, the face veneer 11 is visually seen. The face single plate 11 is thinner than the back single plate 15, that is, the face single plate 11 is more than the single plates 12 to 15 other than the single plate 11. It will be thin.

  In the present embodiment, it is necessary to set the thickness of the face single plate 11 to 0.2 mm to 0.8 mm, preferably 0.2 mm to 0.5 mm. That is, when the face single plate 11 is too thick, there is a possibility that sufficient sound insulation cannot be obtained, as will be apparent from examples described later. Conversely, if the face single plate 11 is too thin, sufficient rigidity cannot be obtained, and the flooring material may be bent and cracked.

  In the present embodiment, when the back single plate 15 is too thick, it is difficult to achieve a balance with the thickness of the face single plate 11 and there is a risk of warping. Therefore, it is preferable to use a back single plate 15 having substantially the same thickness as the face single plate 11. Specifically, the thickness of the back veneer 15 is preferably set to 0.2 mm to 1.5 mm, preferably 0.2 mm to 0.8 mm, more preferably 0.2 mm to 0.5 mm. Is good.

  In addition, as the second to fourth single plates 12 to 14, those having a normal thickness of 1 mm to 3 mm can be suitably used.

  In the present embodiment, the third-layer single plate 13 is set thinner than the second-layer and fourth-layer single plates 12 and 14.

  In this embodiment, as a method for obtaining a plywood whose face veneer 11 is thinner than the other veneers 12 to 15 or a plywood having the smallest thickness of the face veneer 11, general 5 acquired by a well-known method. A method of cutting the ply plywood into a desired thickness of the face single plate can be suitably employed. Also, prepare a thin veneer and a thicker veneer in advance, and stack and integrate the thin veneer and other thick veneers so that the thin veneer becomes a face veneer. Thereby, the plywood whose face single plate is thinner than the other single plate, or the plywood whose face single plate 11 is the thinnest can be obtained. But in this invention, the manufacturing method of the plywood base material layer 1 is not specifically limited, You may manufacture by what kind of method.

  In this embodiment, as a tree species of each single board 11-15 which comprises the plywood base material layer 1, Lauan, Capol, Kempas, Acacia Mangum, Falcata, Eucalyptus, Chamelere, Hippopotamus, Sugi, Scots pine, Todomatsu, Larch, radiata pine, etc. can be employed. Among these, lauan can be preferably used.

  Furthermore, these trees may be used alone or in combination. That is, the plywood base material layer 1 may be prepared by laminating a plurality of single plates made of the same kind of tree, or made by laminating a plurality of two or more types of single plates made of trees of different tree species. You may do it.

  In the present embodiment, the plywood base material layer 1 is formed with a back groove 4 that opens to the back side (downward side). The back grooves 4 are arranged in parallel to the floor material width direction (lateral direction), and a plurality of back grooves 4 are formed at predetermined intervals in the floor material length direction.

  The back groove 4 needs to be set so that the upper end position (groove bottom position) is disposed in the second layer single plate 12. That is, when the upper end position of the back groove 4 is disposed in any one of the single plates 13 to 15 in the third to fifth layers, sufficient sound insulation is obtained, as will be apparent from examples (comparative examples) described later. There is a risk that it may not be possible to obtain sex. Moreover, when the upper end position of the back groove | channel 4 is arrange | positioned in the face single board 11, sufficient rigidity cannot be acquired and there exists a possibility that a flooring may bend and be damaged.

  In this embodiment, the width A1 of the back groove 4 is preferably set to 1 mm to 5 mm, more preferably 3 mm or less. That is, when the groove width A1 is too wide, it may be difficult to obtain sufficient rigidity. If the groove width A1 is too narrow, it may be difficult to obtain sufficient sound insulation.

  Furthermore, in this embodiment, it is preferable to set the distance A2 between the adjacent back grooves 4 to 5 mm to 15 mm. That is, if this interval A2 is too wide, it may be difficult to obtain sufficient sound insulation. Further, if the distance A2 is too narrow, it may be difficult to obtain sufficient rigidity.

  In the present embodiment, the back groove remaining thickness A3, which is a dimension from the upper end position of the back groove 4 to the surface of the plywood base material layer 1, may be set to 0.4 mm to 3.3 mm, preferably 0.8 mm. It is good to set to 4 mm-3.0 mm, More preferably, it is good to set to 0.4 mm-2.0 mm, More preferably, it is good to set to 0.4 mm-1.7 mm. That is, if the back groove remaining thickness A3 is too thick, it may be difficult to obtain sufficient sound insulation. Further, when the back groove remaining thickness A3 is too thin, it may be difficult to obtain sufficient rigidity.

  Note that the second-layer veneer 12 should have a thickness of at least 0.2 mm. That is, when the thickness is less than 0.2 mm, the rigidity is lowered and the flooring may be broken.

  In the present embodiment, a back groove parallel to the floor material length direction (longitudinal direction) may be formed on the back surface side of the plywood base material layer 1. For example, by forming a plurality of vertical back grooves at predetermined intervals in the floor width direction, it is possible to effectively prevent warpage in addition to improving sound insulation. Note that the upper end position (groove bottom position) of the back groove in the vertical direction is preferably arranged in the fourth layer (second layer from the bottom) of the single plate 14 in the plywood substrate layer 1.

  A surface protective layer may be laminated on the upper surface of the face veneer 11 on the plywood substrate layer 1 as necessary. As the surface protective layer, wood fiber boards such as medium fiber board (MDF) and hard fiber board (HDF), resin-impregnated sheets, and the like can be suitably used.

  In this embodiment, the thickness of the plywood base material layer 1 is preferably set to 4 mm to 12 mm, preferably 5 mm to 12 mm, and more preferably 5 mm to 9 mm. But in this invention, the whole thickness of the plywood base material layer 1 can be adjusted according to the thickness of the whole flooring to be manufactured.

  As shown in FIG. 1, as the decorative layer 2 laminated on the surface (upper surface) of the plywood base material layer 1, a veneer, a resin sheet, paper, resin-impregnated paper, or the like can be suitably used.

  Moreover, as the sound insulation layer 3 laminated | stacked on the back surface (lower surface) of the plywood base material layer 1, the sheet | seat which has sound insulation property, for example, a sound insulation sheet comprised with a foaming urethane resin, a foamed polyethylene resin, a polyester fiber nonwoven fabric etc. is used suitably. be able to.

 Further, as the sound insulation layer 3, a layer having a thickness of 2 mm to 6 mm, more preferably 2 mm to 4 mm, and still more preferably 2 mm to 3 mm may be used. That is, if the thickness of the sound insulation layer 3 is too thin, the sound insulation performance is deteriorated. On the other hand, if the sound insulation layer 3 is too thick, the feeling of walking may be deteriorated.

  In addition, since the flooring of this embodiment is provided with the sound insulation performance excellent as the whole flooring so that it may become clear from the below-mentioned Example, as a sound insulation sheet which comprises the sound insulation layer 3, use a thin thing. Can do.

  Further, in the flooring of the present embodiment, the overall thickness is preferably set to 7 mm to 15 mm, preferably 8 mm to 15 mm, more preferably 8 mm to 14 mm. good.

  In addition, as shown in FIG. 1, the male real part 51 is formed in two adjacent sides among the four surrounding edges in the flooring of this embodiment, and the female real part 52 is formed in the remaining two sides.

  The flooring material of the present embodiment configured as described above is constructed by flooring by being directly pasted on a floor slab S such as a concrete slab via an adhesive or the like.

  In the floor structure formed by applying the flooring material of the present embodiment, sufficient sound insulation can be obtained, as will be apparent from the examples described later.

  Furthermore, since the elastic sound insulation layer 3 is formed relatively thin with respect to the entire thickness of the flooring material, when it is stepped on, it gradually sinks in a small amount, and a satisfactory walking feeling (stepping comfort) is also reliably obtained. be able to.

  In the above-described embodiment, the case where a 5-ply plywood obtained by laminating five single plates with alternating fiber directions is used as an example of the plywood base material layer 1 has been described as an example. In the invention, any plywood can be adopted as the plywood substrate layer 1 as long as it is a plywood of 3 plies or more obtained by laminating 3 or more single plates.

<Example 1>
As shown in FIG. 1, the flooring of Example 1 was prepared similarly to the said embodiment. That is, a plywood substrate layer 1 made of a 5-ply lauan plywood, a decorative layer (projection plate) 2 laminated on the surface of the plywood substrate layer 1, and a sound insulating layer laminated on the back surface of the plywood substrate layer 1 ( A flooring provided with a sound insulation sheet) 3 was prepared. As shown in Table 1, in this flooring, the face veneer 11 of the plywood substrate layer 1 is set to 0.8 mm, and the back veneer 15 is set to 1.1 mm. Further, the single plates 12 to 14 of the second layer, the third layer, and the fourth layer of the plywood substrate layer 1 are set to 2.6 mm, 1.3 mm, and 2.6 mm.

  Further, the veneer as the decorative layer 2 was 0.3 mm thick, and the sound insulation sheet as the sound insulation layer 3 was 4.6 mm thick.

  The plywood substrate layer 1 has a back groove 4 that opens to the back side. The back grooves 4 are arranged in parallel to the floor material width direction, and a plurality of back grooves 4 are formed at equal intervals in the floor material length direction. Further, the upper end position (bottom surface position) of each back groove 4 is disposed above a substantially intermediate position in the vertical direction of the second single plate 12 of the plywood base material layer 1. Further, the width A1 (see FIG. 2) of the back groove 4 is set to 3 mm, and the interval A2 (see FIG. 2) between the adjacent back grooves 4 is set to 9 mm.

  In addition, back groove part remaining thickness A3 (refer FIG. 2) which is a dimension from the upper end position of the back groove 4 to the surface of the plywood base material layer 1 is set to 1.6 mm.

  Moreover, as shown in Table 1, the thickness of the whole flooring is set to 13.3 mm.

  The flooring material of Example 1 was evaluated for sound insulation performance based on the estimated L grade. The results are shown in Table 2.

As shown in Table 2, in the flooring material of Example 1, the floor impact sound level (dB) in the specified frequency band (125 Hz, 250 Hz, 500 Hz, 1 kHz, 2 kHz) is 44.6 dB and 44.7 dB, respectively. 44.1 dB, 36.5 dB, and 23.4 dB, and the estimated number of determined L was 44.7 dB. Therefore, the estimated L grade satisfied the L4 5 standard of 43.5 to 46.4 dB.

  Subsequently, the sound insulation performance (floor impact sound reduction performance) was evaluated based on the ΔL grade for the floor material of Example 1 above. The results are shown in Table 3.

  As shown in Table 3, the reduction amounts (dB) in the specified frequency bands (125 Hz, 250 Hz, 500 Hz, 1 kHz, 2 kHz) were 11 dB, 21 dB, 28 dB, 39 dB, and 53 dB, respectively. Therefore, ΔLL (I) -4 standard (10 dB or more, 19 dB or more, 25 dB or more, 29 dB or more, 31 dB or more) was satisfied in each frequency band.

<Example 2>
As shown in Table 1, a flooring material of Example 2 was produced in the same manner as in Example 1 except that a face veneer 11 in the plywood substrate layer 1 having a thickness of 0.5 mm was used. The total thickness of the flooring was 13.0 mm. Further, the back groove remaining thickness A3 was 1.3 mm.

  For the flooring material of Example 2, the sound insulation performance was evaluated based on the estimated L grade and ΔL grade in the same manner as described above. As a result, as shown in Tables 2 and 3, the determined estimated L number was 44.1 dB, which satisfied the performance of L45. Further, in the ΔL class, all the reduction amounts in the respective frequency bands satisfied the standard of ΔLL (I) -4.

<Comparative Example 1>
As shown in Table 1, a flooring material of Comparative Example 1 was produced in the same manner as in Example 1 except that the face single plate 11 in the plywood substrate layer 1 was 1.1 mm thick. The total thickness of the flooring was 13.6 mm. Further, the back groove remaining thickness A3 was 1.9 mm.

  For the flooring material of Comparative Example 1, the sound insulation performance was evaluated based on the estimated L grade and ΔL grade in the same manner as described above. As a result, as shown in Tables 2 and 3, the determined estimated L number was 45.5 dB, which satisfied the performance of L45. However, since the estimated estimated L class of Comparative Example 1 is larger than the estimated estimated L number of Examples 1 and 2, the impact sound is larger than the flooring materials of Examples 1 and 2, and the sound insulation is inferior. It was a thing.

  Furthermore, in the ΔL grade of Comparative Example 1, all the reduction amounts in the respective frequency bands satisfied the performance of ΔLL (I) -4. However, the flooring material of Comparative Example 1 is often smaller in the amount of reduction in each frequency band than the flooring materials of Examples 1 and 2, and is inferior in sound insulation than the flooring materials of Examples 1 and 2. It was a thing.

<Comparative example 2>
As shown in Table 1, a flooring of Comparative Example 2 was produced in the same manner as Comparative Example 1 except that a 0.7 mm thick one was used as the back veneer 15 in the plywood substrate layer 1. The overall flooring thickness was 13.2 mm. Further, the back groove remaining thickness A3 was 1.9 mm.

  For the flooring material of Comparative Example 2, the sound insulation performance was evaluated based on the estimated L grade and ΔL grade in the same manner as described above. As a result, as shown in Tables 2 and 3, the determined estimated L number was 45.9 dB, which satisfied the performance of L45. However, since the estimated estimated L class of Comparative Example 2 is larger than the estimated estimated L number of Examples 1 and 2, the impact sound is larger than the flooring materials of Examples 1 and 2, and the sound insulation is inferior. It was a thing.

  Furthermore, in the ΔL grade of Comparative Example 2, all the reduction amounts in each frequency band satisfied the performance of ΔLL (I) -4. However, since the flooring material of Comparative Example 2 has a smaller amount of reduction in each frequency band than the flooring materials of Examples 1 and 2, the sound insulation is lower than the flooring materials of Examples 1 and 2. It was inferior in nature.

<Comparative Example 3>
As shown in Table 1, a flooring of Comparative Example 3 was produced in the same manner as Comparative Example 1 except that a back single plate 15 in the plywood substrate layer 1 having a thickness of 0.4 mm was used. The overall flooring thickness was 12.9 mm. Further, the back groove remaining thickness A3 was 1.9 mm.

  For the flooring of Comparative Example 3, the sound insulation performance was evaluated based on the estimated L grade and ΔL grade in the same manner as described above. As a result, as shown in Tables 2 and 3, the determined estimated L number was 45.9 dB, which satisfied the performance of L45. However, since the estimated estimated L class of Comparative Example 3 is larger than the estimated estimated L number of Examples 1 and 2, the impact sound is larger than the flooring materials of Examples 1 and 2, and the sound insulation is inferior. It was a thing.

  Furthermore, in the ΔL grade of Comparative Example 3, all the reduction amounts in the respective frequency bands satisfied the performance of ΔLL (I) -4. However, the flooring material of Comparative Example 3 is often smaller in the amount of reduction in each frequency band than the flooring materials of Examples 1 and 2, and is inferior in sound insulation than the flooring materials of Examples 1 and 2. It was a thing.

  <Example 3>

  As shown in Table 4, a 5-ply lauan plywood having a thickness of 5.4 mm was used as the plywood substrate layer 1. This plywood has a face veneer 11 of 0.7 mm thickness, a second veneer 12 of 1.4 mm, a third veneer 13 of 1.2 mm, and a fourth veneer 12 of 1.4 mm. The back veneer 15 is 0.7 mm thick.

  Further, as the sound insulation sheet (sound insulation layer 3), a sheet having a thickness of 2.5 mm was used. This sound insulation sheet is about half as thin as the 4.6 mm thick sheet used in Examples 1 and 2 and Comparative Examples 1 to 3.

  The total thickness of the flooring was 8.2 mm, and the back groove remaining thickness A3 was 1.1 mm.

  Except this, the flooring of Example 3 was produced in the same manner as in Example 1 above.

  In the same manner as described above, the sound insulation performance of the flooring material of Example 3 was evaluated based on the estimated L grade and ΔL grade. The results are shown in Tables 5 and 6.

  The floor material of Example 3 is not much different from that of Comparative Examples 1 to 3 in the evaluation of the sound insulation performance by the estimated L grade and ΔL grade, but the floor material of Example 3 is a sound insulation sheet (sound insulation layer 3). ), A comparatively thin one that is about half that of Comparative Examples 1 to 3 is used. Usually, when the sound insulation sheet is thinned, naturally, the sound insulation performance is also lowered. However, in the case of including the gist of the present invention as in the flooring material of Example 3, the sound insulation sheet may be thinned by about half. The performance of the estimated estimated number L of L45 was satisfied, and the ΔL grade also satisfied the standard of ΔLL (I) -4. In other words, the flooring material of Example 3 has excellent sound insulation performance as the entire flooring material.

  In particular, the flooring material of Example 3 is excellent in sound insulation performance, and the entire flooring material is 8.2 mm, which is thin and lightweight.

  Moreover, the flooring material of Example 3 has a lower sinking speed and a smaller sinking amount when stepped on than the flooring materials of Comparative Examples 1 to 3, and is excellent without so-called fluffy feeling. It had a good feeling of walking.

<Example 4>
As shown in Table 4, a 5-ply lauan plywood having a thickness set to 8.3 mm was used as the plywood substrate layer 1. This plywood has a face veneer 11 of 0.7 mm thickness, a second veneer 12 of 2.6 mm, a third veneer 13 of 1.3 mm, and a fourth veneer 14 of 2.6 mm. The back veneer 15 is 1.1 mm thick.

  The total thickness of the flooring was 11.1 mm, and the back groove remaining thickness A3 was 1.5 mm.

  Except for this, the flooring of Example 4 was made in the same manner as in Example 3 above.

  In the same manner as described above, the sound insulation performance of the flooring material of Example 4 was evaluated based on the estimated L grade and ΔL grade. The results are shown in Tables 5 and 6.

  Even in the flooring material of this Example 4, as in Example 3, the performance of L45 and ΔLL (I) -4 was evaluated in the evaluation of the sound insulation performance based on the estimated L grade and ΔL grade, although a thin sound insulation sheet was used. And had excellent sound insulation. Further, this flooring material also had a good walking feeling like the flooring material of Example 3 above.

  <Example 5>

  As shown in Table 7, the flooring material of Example 5 was prepared in the same manner as in Example 1 except that the width A1 of the back groove 4 was 1.5 mm and the back groove part remaining thickness A3 was 2.1 mm. .

  In the same manner as described above, the sound insulation performance of the flooring material of Example 5 was evaluated based on the estimated L grade and ΔL grade. The results are shown in Tables 8 and 9.

  The estimated estimated L number in Example 5 was 44.5 dB, which satisfied the performance of L45. Further, in the ΔL class, all the reduction amounts in the respective frequency bands satisfied the standard of ΔLL (I) -4.

<Example 6>
As shown in Table 7, the flooring material of Example 6 was prepared in the same manner as in Example 2 except that the width A1 of the back groove 4 was 1.5 mm and the back groove part remaining thickness A3 was 1.8 mm. .

  For the flooring material of Example 6, the sound insulation performance was evaluated based on the estimated L grade and ΔL grade in the same manner as described above. As a result, as shown in Tables 8 and 9, the estimated estimated L number in Example 6 was 44.2 dB, which satisfied the performance of L45. Further, in the ΔL class, all the reduction amounts in the respective frequency bands satisfied the standard of ΔLL (I) -4.

<Example 7>
As shown in Table 7, the flooring material of Example 7 was prepared in the same manner as in Example 3 except that the width A1 of the back groove 4 was 1.5 mm and the back groove part remaining thickness A3 was 1.4 mm. .

  In addition, as the sound insulation sheet (sound insulation layer 3), as in Example 3, a thin sheet having a thickness of 2.5 mm is used.

  For the flooring material of Example 7, the sound insulation performance was evaluated based on the estimated L grade and ΔL grade in the same manner as described above. As a result, as shown in Tables 8 and 9, the floor material of Example 7 had a determined estimated L number of 44.1 dB and satisfied the performance of L45. Further, in the ΔL class, all the reduction amounts in the respective frequency bands satisfied the standard of ΔLL (I) -4. In other words, the flooring material of Example 7 was provided with the same level of sound insulation performance as the above examples, despite the thin sound insulation sheet.

  Further, the flooring material of Example 7 also had a good feeling of walking as in the flooring materials of the above Examples.

<Example 8>
As shown in Table 7, the flooring material of Example 8 was prepared in the same manner as in Example 4 except that the width A1 of the back groove 4 was 1.5 mm and the back groove part remaining thickness A3 was 2.0 mm. .

  As the sound insulation sheet (sound insulation layer 3), as in Example 4, a thin sheet having a thickness of 2.5 mm is used.

  In the same manner as described above, the sound insulation performance of the flooring material of Example 8 was evaluated based on the estimated L grade and ΔL grade. As a result, as shown in Tables 8 and 9, the flooring material of Example 8 satisfies the performance of L45 of the estimated estimated number L, and also satisfies the criterion of ΔLL (I) -4 even in the ΔL grade. there were. In other words, the flooring material of Example 8 satisfied the predetermined sound insulation performance even though a thin sound insulation sheet was used as in Examples 3, 4 and 7.

  Further, the flooring material of Example 8 also had a good walking feeling as in the flooring materials of the above Examples.

<Comparative example 4>
As shown in Table 7, the face veneer 11 in the plywood substrate layer 1 was 0.6 mm thick. Further, the back groove remaining thickness A3 was set to 3.9 mm, and the upper end position (bottom surface position) of the back groove 4 was disposed in the third single plate 13 of the plywood base material layer 1. Other configurations were the same as in Example 5 above, and the flooring of Comparative Example 4 was created. Note that the total thickness of the base material layer 1 and the total thickness of the flooring material in Comparative Example 4 are thinner than those of Example 5 because the face single plate 11 is thin (0.2 mm).

  For the flooring material of Comparative Example 4, the sound insulation performance was evaluated based on the estimated L grade and ΔL grade in the same manner as described above. As a result, as shown in Tables 8 and 9, the estimated estimated L number is 54.9 dB and the performance of L55, and the ΔL grade is the performance of ΔLL (I) -2. Both the estimated L grade and the ΔL grade are implemented. The sound insulation performance was inferior by 2 ranks compared to the examples and other comparative examples.

  As is clear from Comparative Example 4, even if the face veneer 11 is a thin floor material, if the upper end position of the back groove is disposed in the third layer veneer, good sound insulation It was confirmed that performance could not be obtained.

  As described above, the flooring materials of Examples 1 to 8 related to the present invention were superior in sound insulation performance compared with the flooring materials of Comparative Examples 1 to 4 that departed from the gist of the present invention.

  The wooden floor material of the present invention can be used for floor finishing in a reinforced concrete apartment.

1: Plywood base material layer 11: 1st layer single plate (face single plate)
15: 5th layer veneer (back veneer)
2: Makeup layer 3: Sound insulation layer 4: Back groove A3: Back groove remaining thickness S: Concrete slab (slab floor)

Claims (9)

A plywood substrate layer constituted by a plywood in which a plurality of single plates are laminated; a decorative layer provided on the front surface side of the plywood substrate layer; and a sound insulating layer provided on the back surface side of the plywood substrate layer; It is a wooden flooring that is constructed by direct pasting,
In the plywood substrate layer, a plurality of back grooves extending in the floor material width direction and opened to the back surface side are formed at intervals in the floor material length direction,
The upper end position of the back groove is disposed in the single plate of the second layer from the top in the plywood substrate layer,
Among the plurality of single plates constituting the plywood substrate layer, the first single plate is formed to be the thinnest, and the thickness of the first single plate is set to 0.2 mm to 0.8 mm ,
A wooden flooring characterized in that an estimated L grade as a sound insulation performance satisfies a standard of L45 or a ΔL grade satisfies a standard of ΔLL (I) -4 .   The wood-based flooring according to claim 1, wherein the first single plate in the plywood base material layer is formed thinner than single plates other than the first layer.   3. The woody flooring according to claim 1, wherein the plywood base material layer is constituted by a 5-ply plywood in which five single plates are laminated and integrated with fiber directions alternately orthogonal to each other.   The back groove part residual thickness which is a dimension from the upper end position of the said back groove to the surface position of the 1st layer veneer is set to 0.4 mm-3.3 mm. Wooden flooring.   The woody flooring material according to any one of claims 1 to 4, wherein a thickness of the sound insulation layer is set to 2 mm to 6 mm.   The woody flooring material according to any one of claims 1 to 5, wherein a thickness of a lowermost single plate in the plywood base material layer is set to 0.2 mm to 1.5 mm.   The woody flooring material according to any one of claims 1 to 6, wherein a thickness of the plywood base material layer is set to 4 mm to 12 mm.   The woody flooring material according to any one of claims 1 to 7, wherein a thickness of the entire flooring material is set to 7 mm to 15 mm. It is a floor structure in which a wooden floor is directly pasted on a slab floor,
The wood-based flooring includes a plywood base material layer formed of plywood in which a plurality of single plates are laminated, a decorative layer provided on the surface side of the plywood base material layer, and a back surface side of the plywood base material layer And a sound insulation layer provided in
In the plywood substrate layer, a plurality of back grooves extending in the floor material width direction and opened to the back surface side are formed at intervals in the floor material length direction,
The upper end position of the back groove is disposed in the single plate of the second layer from the top in the plywood substrate layer,
Among the plurality of single plates constituting the plywood substrate layer, the first single plate is formed to be the thinnest, and the thickness of the first single plate is set to 0.2 mm to 0.8 mm ,
The floor structure according to claim 1, wherein the wooden floor material satisfies an estimated L grade as a sound insulation performance of L45 or a ΔL grade of ΔLL (I) -4 .

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