JP3092040B2 - Floorboard - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to floorboards.

[0002]

2. Description of the Related Art Conventionally, a decorative veneer is adhered to the surface of a floor plate substrate, and a back groove is formed on the back surface of the floor plate substrate to impart plasticity to the floor plate substrate. 2. Description of the Related Art Floorboards are known which provide soundproofing performance by adhering a cushioning material such as a nonwoven fabric and which can be constructed with a bear that has absorbed unevenness of a floor substrate.

[0003]

However, the grooves formed on the floorboard substrate can be formed only to a depth that leaves at least two single veneers on the surface when, for example, a 5-ply plywood is used as the substrate. . This is because if the groove is formed further deeply, the bending strength of the remaining portion on the surface of the groove connecting the floor plates becomes extremely low, and the surface portion of the groove remains on the surface side due to impact from the surface at the time of construction or after construction. This is because there is a problem that the part is easily broken.

[0004] For this reason, grooves can be formed only up to a state where the floor board has a certain degree of bending rigidity, and the floor board does not have a sufficient vibration damping effect. Vibration is likely to occur in the substrate, and the cushioning material on the front side cannot sufficiently absorb the vibration, which causes a problem that the vibration is transmitted downstairs.

In order to solve this problem, an attempt has been made to improve the ability to absorb vibration by increasing the thickness of the cushioning material. However, as the thickness of the cushioning material increases, a load is applied to the floorboard. The amount of sinking of the floorboard at the time becomes large and the walking feeling is poor, and the sinking of the floorboard when placing a heavy object causes problems such as actually forming the joint of the floorboards, etc. Did not.

[0006]

SUMMARY OF THE INVENTION In view of the above problems, the present invention has been intensively studied to provide a floor panel in which the entire floor panel has a vibration damping action. As a result, the present invention has been completed. is there. That is, in the present invention, a soft resin sheet is adhered to the surface of the wooden substrate, and a veneer having a thickness smaller than that of the sheet is adhered to the surface of the soft resin sheet, and a plurality of sheets are provided from the back side of the wooden substrate. The grooves are formed to a depth that is thinner than the thickness of the soft resin sheet and that the surface layer remains to be thicker than the thickness of the veneer to be attached to the surface, and a cushioning material is attached to the back of the wooden substrate. The present invention relates to a floorboard that is worn.

[0007]

In the floorboard of the present invention, a plurality of grooves are formed from the back side of the floorboard substrate, and while the rigidity of the floorboard substrate is reduced, the floorboard has high flexibility on the front side and is resistant to a tensile load. Since the soft resin sheet having excellent strength is adhered, it is possible to prevent the surface layer remaining on the surface side of the groove portion of the floorboard substrate from being damaged.

Further, since the veneer having a thickness smaller than that of the soft resin sheet and having a flexural rigidity smaller than that of the soft resin sheet is used, and the flexural rigidity of the cushioning material is almost negligible, the present invention is applied. The flexural rigidity of the floorboard is equal to the sum of the rigidity of the surface layer remaining on the groove surface side of the floorboard substrate and the flexural rigidity of the soft resin sheet, and the floorboard is extremely plastic. For this reason,
When an impact is applied to the floorboard surface, the entire floorboard is easily deformed, and exhibits an excellent vibration damping effect.

Further, by using a soft resin sheet mixed with wood powder, the adhesive of the wood powder exposed on the surface is well wetted and the adhesive easily penetrates, so that the soft sheet and the veneer and floor board on the surface are used. The adhesion strength when bonding with the substrate is improved. For this reason, even if the floorboard is repeatedly deformed when the impact is applied, delamination on these sticking surfaces can be sufficiently prevented. Also, during transportation or construction, the floor plate of the present invention is used. Although shear deformation occurs and causes delamination between layers, peeling is also unlikely to occur due to such deformation.

Further, the soft resin sheet alone has a large shrinkage / expansion ratio due to a temperature change, and has a problem such as warpage of a floorboard or a push-up of a joint portion. By mixing, it is possible to suppress the contraction and expansion of the soft synthetic resin sheet with respect to the temperature change, and it is also possible to prevent problems such as warpage and pushing up.

[0011]

FIG. 1 shows an example of a sectional view of a floor plate 1 of the present invention, and a floor plate substrate 3 having a fitting fruit formed on a side surface.
Veneer 1 is adhered to the surface of the veneer 1 via a soft resin sheet 2,
A plurality of grooves 5 are formed from the back surface of the floor board substrate 3.
Further, a cushioning material 4 is adhered to the back surface of the floor board substrate 3.

As the floor board substrate 3 of the present invention, for example, a wood board such as a plywood, a wood fiber board, a wood chip board, a veneer laminated board can be used. The floorboard substrate 3 has a plurality of grooves 5 formed in parallel from at least the back surface to the front surface side at least in a direction orthogonal to the length direction of the floorboard substrate. It becomes a floor board substrate. Furthermore, by forming the grooves 5 in a direction parallel to the length direction and forming the grooves 5 in a lattice shape, the bending rigidity in the width direction of the floor board substrate 3 can be similarly reduced, and the plasticity of the floor board is improved. When an impact is applied to the floorboard surface, the entire floorboard is easily deformed, and exhibits an excellent vibration damping effect.

The grooves 5 can be formed by cutting from the back surface side of the floor board substrate 3. The deeper the depth, the more the rigidity of the floor board substrate 3 can be reduced and the plasticity of the floor board substrate can be reduced. Will increase. For this reason, the depth of the groove 5 is smaller than the thickness of the soft resin sheet, and is formed to such a depth that the surface layer remains at a thickness not less than the thickness of the veneer adhered to the surface. It is formed to a depth at which the flexural rigidity of the floor board substrate 3 is smaller than the flexural rigidity of the soft resin sheet 2.

Further, in the case of forming a groove to such a depth, if a floor board having a wooden fiber direction is used as a floor board substrate, the floor section is orthogonal to the fiber direction around the groove portion during transportation or construction. When the floorboard is bent in the direction, the problem that the wood fiber is broken easily occurs. For this reason, it is preferable to use a homogeneous base material having no specific fiber direction, such as a wood fiber board, as the floor board substrate.

The veneer 1 may be a natural veneer obtained by cutting natural wood, an artificial veneer, or a veneer sheet lined with a nonwoven fabric, paper, or a synthetic resin sheet. It is formed by bonding to the surface of the soft resin sheet 2 to be used. Further, an overcoat layer can be provided on the surface of the veneer 1. The veneer 1 has a thickness smaller than that of the soft resin sheet and preferably ranges from 0.1 to 1.0 mm. When a thick plate having a thickness of 1.0 mm or more is used, the flexural rigidity of the veneer 1 becomes greater than the flexural rigidity of the soft resin sheet 2, and the plasticity of the floorboard is reduced and the vibration damping effect is reduced. Further, the hardness of the floorboard surface increases, and the collision noise generated when a metal spoon falls and collides, for example, becomes large, and the soundproof performance against light impact noise decreases, which is not preferable.

As the soft resin sheet 2, a thermoplastic resin such as a vinyl chloride resin, a polyethylene resin and a polypropylene resin can be used. For example, in the case of a vinyl chloride resin, a plasticizer is added to 100 parts of the resin. A semi-rigid vinyl chloride sheet in which 10 to 20 parts are mixed or a soft vinyl chloride sheet in which a plasticizer is mixed with 20 to 90 parts per 100 parts of resin can be used.

In addition, other resins may be used as long as they have mechanical properties equivalent to those of the semi-rigid vinyl chloride sheet and the soft vinyl chloride sheet in bending rigidity, tensile strength and hardness (elasticity). . If the flexible resin sheet 2 having a higher bending rigidity or hardness is used, the bending rigidity of the floorboard becomes higher, and the impact cannot be absorbed by the deformation of the entire floorboard. Conversely, if the flexural rigidity or the hardness is lower than these, it is difficult to control the size and thickness of the soft resin sheet 2, and it is not possible to supply flooring materials having uniform specifications.

Further, as the soft resin sheet 2 of the present invention,
It is preferable to use a mixture of these resins mixed with wood flour at a ratio of 30 to 60% by weight. By using a mixture of wood flour in this way, the wood flour portion exposed on the sheet surface has a better wettability of the adhesive than other resin portions and the adhesive easily penetrates. This improves the adhesion strength when bonding the board 1 and the floor board substrate 3, and can prevent the problem of delamination.

Further, while the resin alone causes a large shrinkage / expansion movement due to a temperature change, wood powder which does not undergo dimensional change with respect to a temperature change is mixed at a ratio of 30 to 60% by weight, so that the soft resin sheet 2 can be obtained. In this case, contraction and expansion due to a temperature change as described above can be suppressed, and problems such as warpage of the floorboard and push-up at the joint between the floorboards can be prevented.

Further, when the fitting nut is formed on the four peripheral surfaces of the floor plate as shown in FIG. 1, it is preferable to form the fruit so that the soft resin sheet 2 is exposed on the front side of the male nut 6. With such a configuration, the soft resin sheet having elasticity is interposed in the fitting portion with the female member, and it is possible to prevent generation of squeak noise in the fitting portion.

The cushioning material 4 has a cushioning function of absorbing impact energy by contracting and deforming the impact given to the floorboard surface. For example, a polyethylene resin, a polypropylene resin, a polyurethane resin, A synthetic resin foam such as a polystyrene resin or a rubber foam can be used.

Further, it is preferable to use an open-cell foam as the foaming form, 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. Furthermore, as shown in FIG. 1, at least the convex portion 4 a is formed on the back surface of the cushioning material 4, so that when the convex portion of the cushioning material 4 contracts, the space between the convex portions becomes convex. As a place where the air in the air bubbles of the portion 4a moves as the air shrinks, the floor material having more excellent soundproof performance can be obtained.

Further, as shown in FIG. 2, by forming the projections 4b not only on the back side but also on the front side of the cushioning material 4, the same function is exerted on the front side, so that more excellent soundproofing performance can be obtained. It will be shown. Further, as shown in FIG. 3, a laminate composed of the synthetic resin foam 3 and the nonwoven fabric 7 can be used as a cushioning material.

As the non-woven fabric 7, a non-woven fabric using synthetic fibers or natural fibers can be used. Preferably, the non-woven fabric 7 is attached to the back surface of the floor board substrate 3 so that the tensile strength of the floor board It is preferable to use a material having excellent elasticity in the plane direction without increasing the bending rigidity. In addition, the nonwoven fabric 7 has a sufficient adhesive absorption capacity in order to prevent unnecessary adhesive from penetrating into the synthetic resin foam 8 when the cushioning material 4 is bonded to the floor board substrate 3 using an adhesive. Use what you have.

Specifically, when the synthetic resin non-woven fabric 7 is used, by using a non-woven fabric having a basis weight of 25 g / m ³ or more, the adhesive is sufficiently absorbed and does not permeate the opposite side. By using such a laminate of the nonwoven fabric 7 and the synthetic resin foam 8 as the cushioning material 4, the adhesive is cured while penetrating into the synthetic resin foam 8 in the manufacturing process, so that the foam After reducing the stretching function or laminating and bonding the cushioning material 4, when the obtained floorboards are piled up and cured, the synthetic resin foam 8 is compressed by the weight of the floorboards. Is hardened, the synthetic resin foam 8 cannot return to the original thickness even after being released from the compressed state, and problems such as a reduction in soundproofing performance can be prevented. Such an effect is particularly remarkable when an open-cell synthetic resin foam 8 is used.

[0026]

According to the floor plate of the present invention, a plurality of grooves are formed from the back surface side of the floor plate substrate, so that the rigidity of the floor plate substrate can be reduced. In this case, since the soft resin sheet having excellent strength is adhered, it is possible to prevent the surface layer remaining on the surface side of the groove portion of the floorboard substrate from being damaged.

Further, since the veneer of the surface is thinner than the soft resin sheet and has a flexural rigidity smaller than that of the soft resin sheet, and the flexural rigidity of the cushioning material is small enough to be almost negligible. The flexural rigidity of the floorboard is equal to the sum of the rigidity of the surface layer remaining on the surface of the groove of the floorboard substrate and the flexural rigidity of the soft resin sheet, resulting in a very plastic floorboard. For this reason, the impact applied to the floorboard surface can be absorbed by the deformation of the entire floorboard, thereby exhibiting excellent soundproof performance.

Further, since the soft resin sheet 2 having high flexibility is laminated on the lower surface of the veneer 1, the hardness of the floor plate surface is reduced, and the surface is deformed when an impact is applied to the floor plate surface. Can absorb shock. For this reason, the soundproof performance against a light impact sound such as a collision sound generated when a metal spoon falls and collides is particularly improved.

[Brief description of the drawings]

FIG. 1 is a sectional view of a first embodiment of a floor panel according to the present invention;

FIG. 2 is a cross-sectional view of a second embodiment in which a protrusion 4b is also provided on the front side of the cushioning material 4;

FIG. 3 shows a synthetic resin foam 8 and a non-woven fabric 7 as cushioning material 4
Sectional view of a third embodiment using a laminate comprising

[Explanation of symbols]

1: single plate, 2: soft resin sheet, 3: floor board substrate, 4: cushioning material, 4a: convex portion on the back surface, 4b: convex portion on the front surface, 5: groove,
6: male, 7: non-woven fabric, 8: synthetic resin foam.

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) E04F 15/04 601 E04F 15/18 602

Claims (1)

(57) [Claims] 1. A soft resin sheet is adhered to the surface of a wooden substrate, a veneer having a thickness smaller than that of the soft resin sheet is adhered to the surface of the soft resin sheet, and a plurality of sheets are formed from the back side of the wooden substrate. The grooves are formed to a depth that is thinner than the thickness of the soft resin sheet and that the surface layer remains to be thicker than the thickness of the veneer to be attached to the surface, and a cushioning material is attached to the back of the wooden substrate. Floorboards that are worn.