JP3023671B2 - Floor material - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flooring having soundproofing performance.

[0002]

2. Description of the Related Art Conventionally, there has been known a directly adhered floor material in which a cushioning material such as a synthetic resin or rubber foam is adhered to the back surface of a floor material substrate so as to impart soundproofing performance and non-absorbent performance to a construction base surface. ing. Also, by forming irregularities on the front and back surfaces of the cushioning material, the contact area with the floor base surface is reduced, the amount of impact transmitted to the floor base surface is reduced, and the impact applied to the floor plate surface due to the shrinkage deformation of the projections is reduced. Flooring that absorbs force has also been proposed.

Further, irregularities are formed on the front and back surfaces of the cushioning material,
By forming irregularities so that the ratio of the area of the convex portion between the front and back surfaces differs, when an impact is given to the floor plate surface,
First, the convex portion on the side with the smaller area of the convex portion undergoes shrinkage deformation, and then the convex portion on the side with the larger area of the convex portion undergoes shrinkage deformation, resulting in sound absorption performance over a wide frequency range due to two-stage absorption. Has been proposed.

[0004]

Most of such cushioning materials having irregularities on the front and back surfaces are formed of a synthetic resin foam, and as shown in FIG. The floor material is formed by sticking the cushioning material B having irregularities on the back surface.

However, when an impact is actually applied to the surface of the floor material substrate A having such a structure, the protrusions on the front surface side of the bumps formed on the front and back surfaces of the cushioning material B have a small area ratio of the protrusions. Before the portion contracts and deforms, the plane portion C formed by the hatched front and back concave portions in FIG. 1 easily deforms, and as shown in FIG. In this state, the flat portion was deformed until it came into contact with the back surface of the floor substrate A.

For this reason, even if the ratio of the immersion of the bumps on the front and back surfaces of the cushioning material A is made different, the two-stage shrinkage deformation as planned cannot be obtained, and the soundproof performance is not satisfactory. .

[0007]

Means for Solving the Problems In order to solve such problems, the present inventor has conducted extensive studies for the purpose of causing the shrinkage deformation of the cushioning material to be adhered to the back surface of the flooring material as planned. Have reached the present invention.

That is, the present invention uses a cushioning material layer in which a cushioning material layer on a front surface side and a cushioning material layer on the backside are laminated via a restraint sheet in a flooring material in which a cushioning material layer is adhered to the back surface of a flooring material substrate. It is a flooring characterized by the following.

[0009]

According to the flooring material of the present invention, the cushioning material layer is formed from the front side cushioning material, the restraint sheet and the backside cushioning material, so that the cushioning material on the front side and the backside border the restraining sheet. The shrinkage deformation is performed independently, and even in a configuration in which unevenness is formed on the front and back surfaces of the cushion material, the convex portions formed on the front and back surfaces are deformed without deforming the flat portion formed by the concave portions on the front and back surfaces. By doing so, it is possible to absorb the impact.

[0010]

FIG. 3 shows an example of a sectional view of a flooring material according to the present invention, in which a cushioning material layer 2 is adhered to the back surface of a flooring material substrate 1, and the cushioning material layer 2 is a surface-side cushioning material. 3
And the back side cushion material 4 are laminated via a restraint sheet 5.

The floor material substrate 1 forming the floor material of the present invention is, for example, a plywood, a wood chipboard, a wood fiber board, a veneer laminated board alone or in any combination, or a board and a board. Synthetic resin sheet with excellent buffer effect between
It is possible to use a laminated sheet of foamed synthetic resin or a sound insulation sheet so as to sandwich the sheet.

Further, an optional decorative layer can be formed on the floor material substrate surface. This decorative layer is made of veneer obtained by cutting natural wood, artificial veneer, and nonwoven fabric, paper, veneer sheet backed with synthetic resin sheet, or decorative paper, resin impregnated paper, nonwoven fabric, paper, synthetic resin sheet, etc. The decorative sheet is formed by bonding or by directly painting or printing on the surface.

Further, an overcoat layer can be provided on the surface of the decorative layer. By providing such a decorative layer,
This prevents moisture from penetrating from the surface side, and can solve problems such as warpage, dew condensation, and corrosion due to a change in humidity.

Further, as shown in FIG. 3, a groove may be formed on the back surface of the floor substrate 1. By forming the groove,
It is possible to follow the unevenness of the floor base surface. further,
When the impact is applied to the floor material surface by lowering the rigidity of the floor material substrate 1, the impact can be absorbed by the deformation of the floor material substrate itself, and the soundproof performance can be improved.

As the restraining sheet 5 provided on the core layer of the cushioning material layer 2 of the present invention, paper such as kraft paper, tissue paper, recycled paper, resin-impregnated paper, polyethylene, vinyl chloride,
A synthetic resin sheet such as polypropylene or polyurethane, a metal sheet such as aluminum or copper, a bituminous sheet such as asphalt felt or roofing, or a laminate thereof can be used. In the case where there is a fiber direction as in paper and the tensile strength is different between a direction parallel to the fiber direction and a direction perpendicular to the fiber direction, the longitudinal direction of the floor substrate 1 and the fiber direction of the constraint sheet 5 are parallel. Is preferably used.

Further, as the restraint sheet 5, JIS
It is preferable to use one having a tensile strength in the range of 0.9 kgf to 16 kgf according to the test method specified in P8113.

By using the restraint sheet 5 in this range, the front side cushion material 3 and the back side cushion material 4 of the restraint sheet 5 can be independently contracted and deformed.

By making the cushioning functions of both cushion materials different, two-stage cushioning performance can be provided.
When a material having a tensile strength of less than 0.9 kgf is used, when a shock is applied to the surface of the floor material, the cushion material on the front and back surfaces is subjected to shrinkage deformation of the convex portions formed on the front and back surfaces of the cushion material layer. The flat portion formed by the concave portion and the restraint sheet is undesirably deformed. In addition, when a material having a tensile strength of more than 16 kgf is used,
It is not preferable because the rigidity of the cushion material layer 2 is increased and the soundproof performance is reduced.

The binding between the restraining sheet 5 and the front side cushion material 3 and the back side cushion material 4 is performed using an adhesive such as a urea resin type, a phenol resin type, a melamine resin type, a vinyl acetate resin type or a vinyl urethane resin type. Alternatively, a thermoplastic resin sheet such as an ethylene-based, acrylic-based, or ethylene-vinyl acetate copolymer may be provided on the front and back surfaces of the constraining sheet 5 and bonded by heat-sealing the thermoplastic resin sheet.

Further, by using the restraint sheet 5 having a moisture-proof function, even if moisture is released from the floor substrate on which the floor material is constructed, the moisture reaches the floor material substrate. This is preferable because warpage due to expansion of the floor material substrate and pushing up of the joint can be prevented.

As a material having a moisture-proof function, a moisture permeability of 1
It is preferable to use one having 0 g / m ² · day or less.
Among the restraining sheets 5 described above, a resin-impregnated paper, a synthetic resin sheet, a metal sheet, or a bituminous sheet which itself has a moisture-proof function can be used alone. Further, even in the case of using a paper having a low moisture-proof performance, a thermoplastic resin sheet may be used by laminating the sheet having the moisture-proof function or by attaching the paper 5a to the front-side cushioning material 3 and the back-side cushioning material 4. Using

For example, as shown in FIG. 4, a sheet of paper 5a is used in which thermoplastic resin sheets 5b and 5c having a moisture-proof function are laminated in advance on the front and back, or when they are adhered to cushioning materials 3 and 4 on the front and back. And thermoplastic resin sheets 5b, 5
The moisture-proof function can also be imparted by attaching the thermoplastic resin sheet by thermal fusion with c interposed therebetween.

The front-side cushioning material 3 and the back-side cushioning material 4 constituting the cushioning material layer 2 of the present invention can reduce impact energy by contracting and deforming the impact given to the surface of the floor substrate 1. It has a buffer function of absorbing, and for example, a synthetic resin foam such as a polyethylene resin, a polypropylene resin, a polyurethane resin, a polystyrene resin, or a rubber foam can be used.

Further, it is preferable to use an open-cell type foam, since an air spring phenomenon does not occur and an excellent cushioning effect can be exhibited. In addition, by using the open-cell type, excellent performance can be obtained with an excellent restoring force when released from a state contracted by a long-term load.

The expansion ratio is JIS K-676.
A material adjusted so that the hardness according to No. 7 is in the range of 10 to 40 kg is used. Even if the foaming ratio is the same, the foams have different hardnesses due to different resins. The hardness of the foam affects the cushioning function as a cushioning material and the amount of sinking when a load is applied to the floor material surface. When the foaming amount is less than 10 kg, the cushioning function is excellent but is too soft. In the case of flooring, there is a problem that the sinking amount becomes large and walking feeling is poor. On the other hand, if it is larger than 40 kg, it is not preferable because it is too hard to perform a sufficient buffer function.

As shown in FIG. 4, by forming irregularities on the front surface of the front cushion material 3 and the back surface of the rear cushion material 4, the back surface of the floor material substrate 1, the floor base surface, the cushion material layer 2, The contact area of the floor is reduced, and the impact sound transmitted to the floor base surface is reduced.

Further, when the convex portion shrinks, the concave space is secured as a place for moving air in the convex bubble, and a flooring material having more excellent soundproofing performance can be obtained. In addition, the convex shape of the unevenness may be any shape such as a columnar shape, a triangular prism shape, a quadrangular prism shape, a polygonal prism shape, a truncated cone shape, a truncated pyramid shape, a truncated pyramid shape, and a truncated polygonal pyramid shape.

When irregularities are formed on the front surface of the front cushion material 3 and the rear surface of the rear cushion material 4,
The shape of the convex portion on the front surface side and the rear surface side, the area ratio of the convex portion to the cushion material surface, the size of the convex portion, and the like can be different. When the projections are formed to have different sizes, for example, the surface area of the projections may be different, or the height of the projections may be different.

By forming these elements singly or in combination and differently, when the floor material substrate is subjected to an impact, the convex portions on the front surface side and the rear surface side of the cushion material layer 2 contract and deform. However, excellent soundproofing performance can be exhibited over a wider frequency range, which is preferable.

In particular, by forming the convex portions of the front side cushion material and the rear side cushion material to have different sizes, when a local load is applied to the floor material substrate, local deformation of the floor material substrate 1 can be achieved. When the local deformation reaches the cushion material layer 2, the smaller one of the protrusions formed on the front and back of the cushion material layer 2 starts to deform first, and then the size The larger the is, the better the soundproofing performance due to the two-stage absorption of deformation.

On the other hand, by forming the area ratio of the convex portion to the entire cushion material surface different between the front-side cushion material and the back-side cushion material, even when a local impact is applied, the floor material substrate 1 can be used. Following the local deformation, when the limit of the deformation of the floor material substrate is reached, the force of the entire floor material substrate as a surface for pushing down the cushion material acts on the entire cushion material layer 2.

At this time, the entire convex portion on the side where the area ratio of the convex portions formed on the front and back surfaces of the cushion material layer 2 is small starts to be deformed first, and then the side where the area ratio is large is deformed. Demonstrate soundproof performance.

If the initial local deformation is too large, the walking feeling when walking is poor, so that the local deformation of the floor substrate 1 is restrained even a little and is spread over a wide surface and absorbed.
It is preferable to make the size of the convex portion on the front surface side of the cushion material 2 or the area ratio of the convex portion larger than that of the convex portion on the rear surface side.

When a synthetic resin foam is used as the front-side cushion material 3 and the back-side cushion material 4, the shrinkage deformation characteristics between the two can be made different by making the expansion ratios of the two different.

The cushioning material layer 2 of the present invention can be formed by a method of attaching the front side cushioning material and the backside cushioning material with the unevenness formed in advance via the restraining sheet 5 or the surface side cushioning material without the unevenness. Also, after the back side cushion material is adhered via the restraining sheet 5, it can also be obtained by a method of hot-pressing from the front and back surfaces with a hot plate having a concave and convex shape.

In the latter method, the number of steps of the heating press is one.
It is preferable that both the cushioning materials have no irregularities when the three layers are applied and that the pressure for attaching from the front and back surfaces is uniformly applied.

In the latter method, the expansion ratio may be varied by using different cushioning ratios for the front side cushion material 3 and the back side cushion material 4 to be adhered to the front and back of the restraint sheet, or Even in the case of using the same synthetic resin foam having the same expansion ratio before forming the irregularities, a method using a synthetic resin foam having a different thickness is used. The foaming ratio of the front side cushion material 3 and the back side cushion material 4 can also be made different depending on the method used.

[0038]

According to the flooring material of the present invention, the cushioning material layer is formed of the front side cushioning material, the restraint sheet and the backside cushioning material, so that the cushioning material on the front side and the backside is bounded by the restraining sheet. Even in a configuration in which unevenness is formed on the front and back surfaces of the cushioning material, the projections formed on the front and back surfaces can be formed independently without deforming the flat portions formed by the recesses on the front and back surfaces. This makes it possible to absorb the shock by deforming.

For this reason, the surface area of the surface of the convex part on the front and back surfaces, the height of the convex part, the ratio of the surface area of the convex part to the whole, and the like are varied, so that the convex part of the front cushion material and the rear cushion material are different. And has both characteristics of shrinkage deformation of the convex portion, and exhibits excellent soundproofing performance over a wide frequency range.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a conventional flooring,

FIG. 2 is a cross-sectional view when the floor material of FIG. 1 is deformed.

FIG. 3 is a cross-sectional view of the flooring material of the present invention.

FIG. 4 is a sectional view of a modification of the flooring material of FIG. 3;

[Explanation of symbols]

1: floor material substrate, 2: cushion material layer, 3: front side cushion material, 4: back side cushion material, 5: restraint sheet, 5
a: paper, 5a, 5b: thermoplastic resin sheet, A: floor material substrate, B: cushioning material, C: plane portion.

Claims (3)

(57) [Claims] 1. A flooring material having a cushioning material layer adhered to the back surface of a flooring material substrate, wherein a cushioning material layer in which a front side cushioning material and a backside cushioning material are laminated via a restraining sheet is used. Flooring. 2. The restraining sheet has a tensile strength of 0.9.
The flooring material according to claim 1, wherein a sheet of Kgf to 16Kgf is used. 3. The flooring material according to claim 1, wherein irregularities are formed on the front surface of the front cushion material and the rear surface of the rear cushion material.