JP2000129856A - Face material for building structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an MDF(a middle-density fiber board) as a face material for building structure without separately adding a new process. SOLUTION: MDFs 2a, 2b are joined with each both surface of the core material of a synthetic-resin foam and sheet-shaped articles 3a, 3b are stuck on an external surface on at least one side in the face material for the building structure, intermediate specific-gravity layers having specific gravity of 0.35-0.8 are exposed on the outsides of base rock layers A on the external surfaces of the MDFs 2a, 2b. Either of aluminum foil, an aluminum-resin laminated film or aluminum sand paper is used on one side and moisture-proof paper employing a synthetic resin as a core on the other side as the sheet-shaped articles. Either of moisture-proof paper using the aluminum-resin laminated film, aluminum sand paper or the synthetic resin as a core is employed as the sheet-shaped article stuck on one side and the exposed surface of the MDF is finished by a file material on the other side as another constitution.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a novel processing of a structural face material used for a wall surface, a floor, a roof base material and the like using a medium density fiberboard.

[0002]

2. Description of the Related Art Conventionally, medium density fiberboard (MDF) is known. This MDF has an overall average specific gravity of 0.35 to 0.5.
8, and has a high-density and hard layer called a bedrock layer having a specific gravity of 0.8 to 1.4 on both sides. The existence of the high-density bedrock is a major reason that the MDF has excellent strength despite its relatively light weight. In addition, since MDF has almost no directionality of the fiber, it is possible to obtain physical properties in which the strength in the vertical and horizontal directions and the expansion / contraction do not change, and the construction and processing are easy with the shape and dimensions being constant. Furthermore, it can easily perform water resistance, moisture resistance, antiseptic treatment, fire prevention treatment, and the like by chemical treatment, and has high heat insulation and sound absorption, and is excellent as a material for controlling sound and room temperature. Therefore, it is used in a wide range from furniture members, construction members, and building members. It should be noted that the conventionally used M
In DF, the hardest part of the bedrock is shaved until it appears on the surface.

[0003] In the dry manufacturing process of MDF, an adhesive is added to wood fibers that have been defibrated at high pressure from wood chips, and a wood fiber mat is manufactured by a forming device, and this is hot-pressed to obtain MDF. ing. However, in this state, since a low-density thin layer is formed on the front and back of the plate by adhesive pre-curing, the pre-cured layer is completely removed by sanding or the like to obtain an MDF as a final product. It is necessary to expose the highest density layer of the rock layer having a specific gravity of 0.8 to 1.4 to the surface.

[0004]

The structural surface material is a surface material used for increasing the rigidity of a detached house or a small building against external force, and is used as a main part in structural strength. For example, it is used as a floor material, a wall material, a roof base, and the like. Conventionally, there are structural plywood and structural panels as structural face materials, but these are often joined by nailing or wood screws in addition to joining by bonding.

[0005] In view of the above-mentioned suitability of the conventional MDF, it has been found that there remains a problem with nailing. MDF as a final product has a rock layer exposed on the surface, but the surface is usually too hard for nailing, so the bite at the beginning of the nailing is poor and the workability is poor. Problem. Also,
When nailing is advanced and the nail head is sunk into the plate surface, the bedrock layer on the surface is directly hit with a nail head or a hammer, and the surface is destroyed. And the MDF whose surface was destroyed
In this case, the rock layer at that portion stops functioning, and the lateral resistance of the nail and the nail penetration force are significantly reduced. This point
It can be said that the presence of the rock layer exposed on the surface functions in a worse way. Therefore, despite the fact that it has excellent in-plane shearing force and bending strength as a structural surface material, there is a problem of nailing joining, and this is the reason why the use of MDF is suspended.

[0006] Further, since the surface of MDF is smooth, it is slippery during handling, and the workability is poor. In particular, when used as a base material for a steeply sloping roof such as a non-flat roof, an operator is liable to slip and there is a risk that the roof material may fall. In the technique disclosed in Japanese Patent Application Laid-Open No. 62-273354, the surface of the MDF as a finished product is cut or rolled by embossing rolls. There is a problem in using it as. In addition, it is expected to form a thermal insulation unevenness on the surface by embossing etc., and as a result, anti-slip effect is expected, but if the unevenness is large enough to emboss, it can prevent slippage, but rather it will cause stumbling So more dangerous

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems, and does not require an additional process in the MDF manufacturing process.
It is an object to disclose a technique capable of obtaining F.

[0008]

In order to achieve the above-mentioned object, in the face material for a building structure of the present invention, a medium-density fiberboard is joined to both surfaces of a synthetic resin foam core material, At least one side of the outer surface of the building structure having a sheet-like material attached thereto, the outer surface of the medium-density fiberboard,
A means of exposing a medium specific gravity layer having a specific gravity of 0.35 to 0.8 outside the bedrock layer was employed. In the manufacturing process of the medium-density fiberboard, the specific gravity of the fiberboard after the completion of the heat pressing is 0.8-
A high-density bedrock that continuously changes at about 1.4 is formed, and the specific gravity of the stable state is 0.35 to
A medium-density fiber layer continuous at about 0.8 is present, and a precure layer having a low specific gravity, which is brittle and slippery and has insufficient strength, appears on the outermost side. In the conventional MDF, a plate material having a hard surface is expected because the rock layer is exposed. Therefore, not only the pre-cured layer is removed at the final processing stage, but also the most stable medium-density fiber layer and the rock layer. It was removed until hard parts appeared. However, the advantage of the medium-density fiber layer is that it has a function of elastically holding nails and the like, similarly to the medium-density fiber layer existing at the center. Further, since the medium-density fiber layer has elasticity, even when the nail is completely driven, it is not broken by the nail head and is not broken by the impact of the hammer. That is,
It functions as a cushioning material against external force.
As a result, a surface material for a building structure suitable for a base plate or a floor plate that can withstand nailing or the like has been achieved. The synthetic resin foam located at the center functions as a cushion and at the same time reduces the overall weight.

Further, as a more specific means of the sheet-like material, the sheet-like material is attached to both sides.
One side is made of any one of aluminum foil, aluminum resin laminate film and aluminum sand paper, and the other side is made of a moisture-proof paper having a synthetic resin as a core. Aluminum foil or the like attached to one side is intended to improve fire resistance and to exhibit an electromagnetic wave shielding effect. Also,
The moisture-proof paper attached to the other side has a function of avoiding condensation on the wall surface.

[0010] Further, in the means according to the third aspect, the sheet is adhered to only one side, and the sheet is any one of an aluminum resin laminated film, an aluminum sand paper, and a moisture-proof paper having a synthetic resin as a core. On the other side on which the object is not adhered, the exposed surface of the medium-density fiberboard is finished with a file. As a more specific means of the file, a # 80 to # 24 count was adopted. Furthermore, the finish with the file material, the static friction coefficient is about 0.7
It was above. The means for finishing the other side with a file material functions as a non-slip when used as a roof base, for example. The file in the present invention is a concept including not only sandpaper processing but also any means for making the other surface less slippery. For example, polishing with a coarse roughness, rubbing the surface with a gold brush or a scraper, adjusting the temperature to 30 to 80 ° C, applying warm water with a penetrant, and then embossing with a flat plate or roll press And those that are embossed.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below. FIG. 1 shows a cross section of a building structural face material according to the present invention, wherein 1 is a synthetic resin foam existing in the center, 2
Reference numerals a and 2b denote medium-density fiberboards provided on both surfaces of the synthetic resin foam 1, respectively, the hardest rock layers A having specific gravities that transition from 0.8 to 1.4, and 0 on the outside thereof. It has a medium density fiber layer B having a density lower than 0.8. Reference numerals 3a and 3b denote sheet-like materials attached to the outside of the medium-density fiberboards 2a and 2b, respectively. Here, the synthetic resin foam 1 exists as a core material, and a material represented by foamed thermosetting resin such as foamed polyurethane, foamed phenol, foamed urea, foamed melamine, etc. is used. There is no particular limitation as long as it is a curable foam material. In addition, the structure of the foam may be closed cells or open cells, but the closed cells are more excellent in heat insulation and moisture resistance. If the layer thickness is 2.5 cm or more, the impact resistance and the heat insulation sound absorption can be greatly improved. The synthetic resin foam 1 includes two medium-density fiberboards 2a, 2a and 2b.
The foam may be injected and foamed into the space b, or may be respectively adhered with an adhesive. Further, on the surface of the medium-density fiberboard which is in contact with the interface with the synthetic resin foam 1, the specific gravity is 0.35 to 0.5 mm depending on the type of the resin material used and the properties of the adhesive.
8 is exposed to the surface, but since this surface absorbs moisture well, when an adhesive is used, an aqueous adhesive is preferable.

As the sheets 3a and 3b, a resin laminate sheet such as an aluminum foil is used on one side, and moisture-proof paper is adhered on the other side. Examples of moisture-proof paper include synthetic resin sheets such as polyethylene sheets, polyvinyl chloride sheets, and polypropylene sheets, as well as kraft paper,
Examples include asbestos paper, and also include a structure in which a vinyl chloride sol-like paste or a vinylidene chloride resin emulsion is directly applied and formed on the surface side of the medium density fiber boards 2a and 2b. Such moisture-proof paper has a moisture permeability coefficient of 0.8.
Since it absorbs much less moisture than a wood fiber board of up to 1.2 g / m ² hHg, by adopting this embodiment, even if there is a difference in water vapor pressure between the front and back of the board, no moisture is permeated. The aluminum foil on one side has an electromagnetic wave shielding effect and effectively functions as a magnetic shield for buildings. The surface of the sheet may be subjected to embossing of unevenness or non-slip processing by applying a resin. As the adhesive used for sticking the sheet-like material, the aqueous adhesive is suitable as described above, but it goes without saying that the adhesive is not limited to this.

On the other hand, there is a case where a finishing process is directly performed with a file material without attaching a sheet material to either of the medium density fiber boards 2a and 2b on both sides. And
Even in the case of processing in this way, the nailing of the first nail is good when nailing the shaft with a CN-50 nail,
Submerging the nail heads to the same plane does not destroy the bedrock layer.

The manufacturing process of the face material for a building structure according to the embodiment will be described. The hot-pressed medium-density fiberboard manufactured by a conventional process is subjected to a surface processing step to further outer the rock layers on both sides. Until the specific gravity reaches an arbitrary specific gravity of 0.35 to 0.8, it is processed with sandpaper having a roughness of # 80 to 24. Two processed plates, the gap of which is about 2.5 to 15
cm, and arranged in a row, and water-foamable hard urethane is injected into the voids to be injected and foamed. At that time, a separator is provided between the two plates, and pressure is applied from the outside of the plates to prevent the structure from expanding due to urethane foaming. Thereafter, a necessary sheet is attached to at least one of the medium density fiberboards provided on both sides. In this manner, the face material for a building structure of the present embodiment can be obtained.

In this embodiment, the medium-density fiberboards 2a and 2b are formed by polishing the front and back surfaces of the hot-pressed board, for example. However, similar face materials can be obtained by other means. It is. That is, two MDFs having rock layers on the front and back
The thickness of one sheet is equal to or smaller than that of the other MDF, and is divided into two in the thickness direction. Then
One of these split plates exposes the bedrock layer and the other, the middle density layer in the center. When these two parts are used as medium-density fiberboards 2a and 2b, respectively, a medium-density fiber layer is provided further outside the bedrock layer, and the operation and effect will be described in the above embodiment. You can expect as well.

[0016]

EXAMPLES Examples of the surface materials for building structures shown in this embodiment will be described below. (Example 1) The precure layer of the medium-density fiberboard after hot pressing was removed, and the specific gravity was 0.35 to outside of the rock layers on the front and back sides.
Finishing was performed with # 80 sandpaper until a medium density fiber layer of 0.8 appeared. The plate material thus obtained was cut into 90 × 180 cm, two of which were arranged,
In the meantime, a stable space was formed using a square material of 2.5 × 2.5 cm as a separator, and water-foamable hard urethane was injected and foamed. Thereafter, the roll press operation conditions were set at a line speed of 20 m / min, and a PET film sandwiched with an aluminum foil using a urethane-based adhesive was used on one side, and a polyethylene was sandwiched using a vinyl acetate emulsion-based adhesive on the other side. The obtained paper sheet was attached to obtain a sample. The physical properties of this sample are as follows.

(Physical Properties) Front and Back Layer Plate LME-9 (Medium Density Fiber Board) Average Specific Gravity 0.69 Thickness 9mm Thermal Conductivity 0.0189 (kcal / mh ° C.) Core Layer Foamed Polyurethane Average Specific Gravity 0.021 Thickness About Peel strength of 25mm core 4.12 (kgf / cm ² )

(Nail test) A nail of CN-50 standard was driven to the extent that the nail head sinks to the surface of the plate material, but no fracture mark was confirmed on the bedrock layer.

(Impact test) Test results based on BTL (BTL NS07) A sand bag weighing 30 kg was applied to 50 cm in height and 100 cm in height from LME-9 alone, and to the product of the present invention obtained in the above embodiment. It was dropped and the damage status was compared. LME-90
Then a hole was created by falling from a height of 100 cm,
In the case of the product of the present invention, only a depression was generated on the surface even when the product dropped from a height of 100 cm. In addition, when dropped from 50 cm, a dent was generated in LME-90, whereas a good surface state was maintained in the product of the present invention.

[0020]

According to the face material for a building structure of the present invention, the medium density fiber layer having a specific gravity of 0.35 to 0.8 is exposed on the surface. In addition, since the medium-density fiber layer functions as a cushioning material, it was possible to reliably prevent the rock layer, which is important for the strength of the face material, from being broken. In addition, when the surface is sanded, it is possible to maintain a non-slip state as a scaffold, particularly when used as a roof base material, which is safe in terms of construction. Furthermore, the synthetic resin foam used as the core material can improve the impact resistance, heat insulation and soundproofing of the entire structural face material, and the sheet-like material attached to at least one of the front and back surfaces exhibits a moisture-proof effect. At the same time, when an aluminum foil or the like is stuck, it is possible to expect anti-magnetism.

[Brief description of the drawings]

FIG. 1 is an example of a cross-sectional view of a face material for a building structure of the present invention.

[Explanation of symbols]

 Reference Signs List 1 synthetic resin foam 2a, 2b medium density fiberboard 3a, 3b sheet

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) E04C 2/16 E04C 2/16 EB (72) Inventor Akio Takei 17-2 Mokucho, Kishiwada-shi, Osaka Hokushin In-house F-term (reference) 2E162 CA29 CB24 CC06 CC08 CD01 CD02 CD09 CD10 DA09 4F100 AB10D AB10E AB33D AB33E AK01A AK01D AK01E AK04 AK22G AK42 AK51 AK51G AP03B AP03C BA04 BA05 BA06 BA07 BA10C BA10DBA10 DG01E JB13A JD04 JD04D JD04E JG06 JH01 JJ02 JK10 JL02

Claims (5)

[Claims] 1. A synthetic resin foam core material on both sides,
Bonding a medium density fiberboard, furthermore, a face material for a building structure in which a sheet-like material is adhered to at least one outer surface thereof,
The outer surface of the medium density fiberboard has a specific gravity of 0.3 on the outside of the bedrock layer.
A face material for a building structure, wherein a medium specific gravity layer of 5 to 0.8 is exposed. 2. The building structure according to claim 1, wherein the sheet-like material is made of one of aluminum foil, aluminum resin laminated film, and aluminum sand paper on one side, and a moisture-proof paper having a synthetic resin as a core on the other side. Surface materials. 3. The sheet-like material attached to one side is any one of an aluminum resin laminated film, aluminum sand paper, and moisture-proof paper having a synthetic resin as a core, and the other side corresponds to the exposed surface of the medium density fiberboard. The face material for a building structure according to claim 1, which is finished with a file material. 4. The face material for a building structure according to claim 3, wherein the file material has a count of # 80 to # 24. 5. The face material for a building structure according to claim 3, wherein the other side finished with the file material has a coefficient of static friction of about 0.7 or more.