JP2595490Y2 - Stepboard for stairs - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a step board for a stair in a house or the like.

[0002]

2. Description of the Related Art As a step board for stairs, a plywood in which veneers are laminated and bonded with their fiber directions orthogonal to each other or a parallel plywood (LV.
L. ) Is generally used as a substrate, and an arbitrary decorative sheet such as a veneer is adhered to the surface of the substrate.

[0003] These plywoods and parallel plywoods have been considered suitable as substrates for stair treads because they can stably supply large-sized boards in large quantities and are excellent in dimensional stability.

[0004]

[Problems to be Solved by the Invention] These plywoods or parallel plywoods are manufactured by laminating and bonding veneers made of thin natural wood. In recent years, the problem of depletion of natural resources has been raised worldwide. It becomes increasingly difficult to cut the raw wood that is the raw material for plywood, and the quality of the raw wood deteriorates, making it difficult to stably obtain a large quantity of high-quality veneers suitable for use in plywood. It has become to.

[0005] For this reason, it is not as easy as before to supply a large quantity of high quality plywood to the market in a stable manner. This problem is expected to become more serious in the future, and there is an aspiration to develop a substitute that can be used in place of plywood as a substrate for a tread for stairs.

[0006]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the prior art, and has an overall specific gravity of 0.4 to 0.8 and its front and back surfaces.
Medium-density fiber with a hard layer with higher specific gravity exposed than the central layer
維板arranged in at least two sides of the veneer layer of each one layer the fiber direction and the substrate laminated material formed by arranging such that the longitudinal direction on the specific gravity fiber plates within them, medium-ratio in the substrate
Regarding the thickness relationship between the heavy fiber board and the veneer layer, the medium specific gravity fiber layer is thicker
And a thickness of the veneer layer is four times or less the thickness of the veneer layer, and a decorative sheet-like material is attached to at least the front and back surfaces and the width direction edge of the substrate.

The medium-density fiberboard is obtained by disintegrating raw wood or waste wood of softwood such as pine, cedar, cypress or hardwood such as Rawan, Kapole, chestnut, and poplar into wood fibers, and forming the wood fibers. Obtained by pressing and bonding.

The medium specific gravity fiberboard is preferably used with the hard layers formed on the front and back portions exposed on the front and back surfaces. By exposing the hard layer on the front and back surfaces in this way, excessive penetration of the adhesive during lamination and bonding with a wooden veneer is suppressed, thereby contributing to an improvement in adhesive strength.

The medium specific gravity fiberboard has an overall specific gravity of 0.4 to 0.8, while the hard layer has a specific gravity of 0.8 to 1.4.

The medium specific gravity fiberboard can be mixed with powder waste materials such as sander dust, saw dust, chip dust and the like generated during the manufacturing process.

The medium-density fiberboard has a small dimensional change rate per 1% of water content of 0.03 to 0.04%, and is substantially uniform in any direction, and has excellent dimensional stability.

For medium-density fiberboard, phenol resin treatment, acetylation treatment, esterification treatment, formalization treatment, PEG (polyethylene glycol) treatment, WPC
(Resin impregnation) treatment or the like can be performed to improve the dimensional stability and mechanical properties of the substrate. These processes are
For example, softwood or hardwood chips can be defibrated according to a conventional method and dried at a stage of wood fiber by a conventional method, and a medium specific gravity fiberboard is manufactured using the obtained treated wood fiber. In addition, by producing a medium-density fiberboard using a wood veneer that has been subjected to a fireproof treatment with a known flame retardant such as ammonium phosphate, phosphorus nitrogen compound, halogen compound, sulfamic acid, boric acid, etc. Is obtained.

As the wood veneer forming the veneer layer, a softwood veneer or a hardwood veneer obtained by cutting a softwood or hardwood log with a cutting device such as a rotary lace or a slicer can be used. These softwood veneers and hardwood veneers have a plate thickness of 0.2 mm or more, preferably 0.5-5.
A 5 mm one is used. If the plate thickness is less than 0.2 mm, it is difficult to provide the necessary strength when used as a substrate of a step board for stairs.
It is preferable that the thickness is not less than m. The board thickness is 5.5mm
It is not preferable that the ratio exceeds the limit, since the shrinkage and expansion caused by the absorption and release of moisture of the veneer affect the dimensional stability of the substrate.

The veneer layer of the substrate is located between the medium density fiberboards.
Each is provided in one layer. That is, medium specific gravity fiber
If boards are provided, between the front and back medium density fiberboards
A single veneer layer is provided as a core layer of
The substrate has a layer structure. In addition, in addition to the front and back medium density fiberboard,
One or more medium density fiberboard layers
If one is used, a single layer
Plate layers are provided, and a total of five or more odd layers
The substrate has a laminated structure.

[0015]

Since the wood veneer has high bending strength and tensile strength in the fiber direction, by arranging the fiber direction so as to match the longitudinal direction of the board, the durability against the tensile load generated on the back side of the stair tread is improved. It has improved properties and excellent bending strength in the longitudinal direction.

[0017] Since the stepboard for stairs is constructed so that its longitudinal end is supported by the girder material, the bending strength in the longitudinal direction is improved by the above configuration, so that it can be suitably used as a treadboard board. .

The wood veneer may be treated with phenol resin, acetylation, esterification, formalization, PEG, W
By performing PC processing or the like, the dimensional stability and mechanical properties of the substrate can be improved. In addition, by using a wood veneer that has been subjected to a fire protection treatment with a known flame retardant such as ammonium phosphate, a phosphorus nitrogen compound, a halogen compound, sulfamic acid, and boric acid, a substrate also having a fire protection function can be obtained. This fire prevention treatment includes, for example, a method of immersing a wood veneer in a flame retardant, a method of applying a flame retardant to the surface of a wood veneer, and applying a flame retardant to a wooden veneer under pressure or reduced pressure. It can be performed by any method such as a method of injection.

Using the medium specific gravity fiber board and the wooden veneer as described above, the medium specific gravity fiber board is disposed at least on the front and back sides, and at least one veneer layer is disposed between the medium specific gravity fiber boards in the longitudinal direction. Arrange and bond so that it becomes
The obtained laminated material is used as a substrate of a step board for stairs.

The decorative sheet to be adhered to at least the front and back surfaces of the substrate and the edge in the width direction is, for example, a natural veneer or an artificial veneer obtained by cutting a natural wood having a thickness of about 0.2 to 3 mm. Veneer sheet lined with a sheet material such as nonwoven fabric, paper, and synthetic resin sheet, 20 to 40 g / m ²
Of decorative paper, of 32~500g / ^{m 2} non-woven fabric, 50g / m
^{2 is} an example of a parchment paper or the like on which an arbitrary pattern pattern printing or a single color coating is applied. After these decorative sheets are adhered to a substrate, they can be coated with any desired top coat.

The decorative sheet is adhered to the surface of the substrate and the edge of the edge in the width direction by mixing a thermosetting resin or a urea powder or the like for improving water resistance into a thermoplastic adhesive such as a vinyl acetate resin. Can be performed. Since the sticking surface of the decorative sheet is made of a medium-density fiberboard having a small coefficient of shrinkage and expansion due to moisture absorption / release, the veneer is less likely to crack even when a veneer is used as the decorative sheet.

An edge material may be adhered to one edge of the substrate in the width direction on one side as required. As the rim material, wood, plywood, fiber board, synthetic resin board, etc., which are easy to cut and have excellent impact resistance are used, prevent damage to the edges due to impact, and have durability as a stair tread Can be improved.

The stair tread of the present invention having the above-described structure is manufactured, for example, as follows.

That is, a medium-density fiberboard and a wood veneer manufactured in advance are prepared, and a medium-density fiberboard is disposed at least on the front and back, and at least one veneer layer is formed between the medium-density fiberboards so that the fiber direction is longitudinal. The substrates are laminated so that they are oriented in the same direction, and are laminated and bonded, and pressed according to a conventional method to obtain a substrate made of these laminated materials.

Further, in the manufacturing process of the medium specific gravity fiberboard,
Using a wood fiber mat obtained by cutting and temporarily pressing the wood fiber deposited and dried on a screen belt with an adhesive applied and dried by a forming device, on the front and back of the wood fiber mat A board having a single veneer layer can be obtained by placing a wood veneer coated with an adhesive, placing another wood fiber mat thereon, and then hot pressing. Of course, it is also easy to obtain a substrate having a plurality of single-plate layers by repeating the above method. This method can use the conventional wood fiberboard production line as it is, and requires only one heat-pressing (one shot), which is industrially advantageous, and furthermore, the medium specific gravity fiber layer in the obtained substrate. The adhesive force between the substrate and the veneer layer becomes extremely large.

In addition, after a wood fiber is deposited on a screen belt by a forming device, a wood veneer is placed on the wood fiber, and then another wood fiber is deposited on the wood veneer by a forming device. After that, the substrate of the present invention is cut by a predetermined method and then temporarily pressed and hot-pressed. Can be obtained.

The front and back surfaces of the substrate are made of medium specific gravity fiber boards. The reason is as follows.

That is, since the medium specific gravity fiberboard has a dense surface and excellent compressive strength, it has been proved that good results can be obtained even in an iron ball drop test on the surface. Also have the property of being hard to dent.

When a bending load is applied to the surface of a stair tread, the medium specific gravity fiber board disposed on the surface has an excellent compression resistance against a compressive load generated on the surface side. The medium-density fiberboard disposed on the back surface has excellent tensile resistance against a tensile load generated on the back surface side, and a tread having excellent bending strength can be obtained.

Furthermore, due to the excellent smoothness of the medium-density fiberboard, the finished state when applying a decorative sheet or applying a coating treatment is good, and the same finished state can be obtained on the front and back surfaces. Can be used without considering the usability, and the workability is improved.

By attaching a decorative sheet material to the front and back surfaces of the substrate thus obtained and to the widthwise edge thereof by a conventional method, the step board for stairs of the present invention can be obtained.

[0032]

A laminated material comprising a medium-density fiberboard disposed on at least the front and back sides and at least one veneer layer disposed between the medium-density fiberboards so that the fiber direction thereof is the longitudinal direction, is used as a tread for stairs. Used as a substrate.

For this reason, the contraction and expansion in the direction perpendicular to the fiber direction in the veneer layer are suppressed by the medium density fiberboard disposed on both sides thereof, and the medium density fiberboard in the direction parallel to the fiber direction in the veneer layer. Is suppressed by the veneer layer in contact therewith. Due to these synergistic suppression effects, a stair tread having extremely excellent dimensional stability can be obtained.

[0034]

FIG. 1 shows an embodiment of a step board for stairs according to the present invention, in which a decorative sheet 2 is adhered to the front and back surfaces of a substrate 1 and to both sides of a wooden edge in the width direction. The board | substrate 1 is the laminated body which arrange | positions the single plate layer 4 between the middle specific gravity fiber boards 3 and 3, and laminates and adheres them. The wooden veneers constituting the veneer layer 4 are arranged such that the fiber direction thereof is the longitudinal direction of the substrate 1.

FIG. 2 shows another embodiment, in which the front and back surfaces of the substrate 1 in which the veneer layers 4, 4 are disposed between the front and back layers and the medium-density fiberboards 3, 3, 3 respectively forming the center layer. Further, the decorative sheet material 2 is attached to one side of the width direction cut edge.
Similarly, the wooden veneers forming the veneer layers 4 and 4 are arranged such that the fiber direction thereof is the longitudinal direction of the substrate 1.

FIG. 3 shows still another embodiment, in which the edge material 5 is adhered to one edge of the substrate 1 in the width direction, and the decorative sheet 2 is formed from the front and back surfaces of the substrate 1. It is attached so as to cover the front and back surfaces and the end surfaces.

[0037]

According to the present invention, it is possible to obtain a step board for stairs having good bending strength in both the width direction and the longitudinal direction and having excellent dimensional stability.

Since a medium-density fiberboard having excellent smoothness, high mechanical strength, and small shrinkage and expansion due to moisture absorption and desorption is arranged on the surface of the substrate, the decorative sheet-like material can be stuck to the surface. It is easy to withstand local loads when used as a step board for stairs, and even when veneer sheets are used as decorative sheets, cracks in veneers due to shrinkage and expansion are less likely to occur. Having.

The substrate is made of a material that can be stably supplied in large quantities in the future, and is extremely useful today when natural resources are being depleted.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing an embodiment of a stair tread according to the present invention.

FIG. 2 is a cross-sectional view showing another embodiment of the present invention.

FIG. 3 is a cross-sectional view showing another embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Substrate 2 Decorative sheet material 3 Medium specific gravity fiber board 4 Veneer layer 5 Edge material

──────────────────────────────────────────────────続 き Continued on the front page (58) Fields surveyed (Int. Cl. ⁶ , DB name) E04F 11/10 E04F 11/16 501 B32B 1/00-35/00 B27M 1/00-3/38 B27D 1 / 04 B27N 1/00-9/00

Claims (2)

(57) [Scope of request for utility model registration] (1) an overall specific gravity of 0.4 to 0.8;
The hard layer with higher specific gravity than the center layer was exposed on the front and back surfaces of
A laminated material in which a medium specific gravity fiber board is disposed at least on the front and back, and a single veneer layer is disposed between the medium specific gravity fiber boards so that the fiber direction thereof is the longitudinal direction, is used as a substrate .
Between the specific gravity fiberboard and the veneer layer
A staircase having a thickness of not more than 4 times the thickness of the veneer layer, and a decorative sheet-like material stuck to at least the front and back surfaces and the width direction edge of the substrate. 2. The step board for stairs according to claim 1, wherein an edge material is adhered to the one side width direction cut edge of the substrate.