JP2008238421A - Building panel material - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a building panel material which suppresses the expansion and contraction of a medium-density woody fiberboard to prevent the bulging of a joint and the formation of a gap, has good workability and ensures the strength of an actually processed part to prevent cracking or the like to keep building quality. <P>SOLUTION: The long medium density woody fiberboard 11 having an upper surface extension part 11a provided on one end side in its width direction and having an undersurface extension part 11b provided on the other end side is integrally fixed on the upper surface of a long plaster board 12 which has a rectangular cross section slightly narrower than the width of the medium density woody fiberboard 11 and has almost the same length as that of the medium density woody fiberboard 11 so as to form not only a recessed actually processed part 15 with respect to the upper surface of the plaster board 12 by retracting the upper surface extension part 11a from one end part in the width direction of the plaster board 12 but also the recessed actually processed part 16 fitted in the recessed actually processed part 15 by protruding the undersurface extension part 11b from the other end part in the width direction of the plaster board 12 and so as to be shifted in its width direction. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a building board material using a medium density wood fiber board (MDF) among hot-pressed wood fiber boards.

Conventionally, as this kind of building board material 1, what is shown in FIG. 4 is known as a flooring material. This building board material 1 includes a base material 3 having a thickness of about 12 mm, in which a medium density wood fiber board 2 is formed in a narrow and long shape among high density, medium density and low density wood fiber boards by hot pressing, It is composed of a veneer laminated on one surface, a decorative covering 4 such as a decorative sheet of synthetic resin or a decorative sheet of printed paper, and a convex actual processing portion 5 and a concave actual processing on both sides of the base 3 in the short direction. Part 6 is formed.

  The building plate 1 is driven and fixed on a base material 7 (not shown) such as a joist, a crosspiece or a panel, and a nail 8 is driven and fixed to an extended part along the base material 7 of the concave actual processing part 6. Then, while making the next building floor material 1 correspond to the unevenness, it is brought close to the building floor material 1 that has been fixed and driven into the concave actual processing part 6 and fixed to the underlaying material 7 and floored. Yes.

Such a wood fiberboard is a board made by hot-press molding of defibrated plant fibers in the presence of an adhesive, and the surface layer in contact with the hot platen has the highest density in the molding, and the center in the thickness direction. The specific gravity gradient in which the density decreases as it goes toward (see Patent Document 1).
Patent Publication 2001-207630

  However, as described in Patent Document 1, the medium-density wood fiberboard 2 is made by hot-pressing the defibrated plant fiber in the presence of an adhesive as described above, and therefore, the expansion and contraction are severe. Accordingly, there is a possibility that the floor material itself may be pressed against each other to cause a problem that a joint is raised or a gap is formed.

  In addition, even if compression molding is performed, since the thickness is large, the density decreases from a portion close to the surface layer toward the center portion, and convex or concave actual processing is performed on the weak portion where the density is low. Accordingly, the strengths of the convex and concave actual processing parts 5 and 6 are weak, and there is a problem that the convex and concave actual processing parts 5 and 6 are cracked, broken or broken by the nail 8 during the conveyance and operation.

  Furthermore, since the nail 8 is driven into the slightly protruded portion of the concave actual machining portion 6, it is driven obliquely as shown in the figure, but the workability is poor, and a part of the concave actual machining portion 6 is broken. There was a problem.

  Therefore, the present invention suppresses the expansion and contraction of the medium density wood fiber board, does not cause the joints to rise or create gaps, has good workability, ensures the strength of the actual processing portion, and does not cause cracks. The purpose is to provide building materials and improve building quality.

  In order to achieve this object, the invention of claim 1 is characterized in that a long medium-density wood fiber board having an upper surface extending portion on one end side in the width direction and a lower surface extending portion on the other end side is obtained. On the upper surface of a long gypsum board having a rectangular section slightly narrower than the width of the wood fiber board and having the same length, the upper surface extension portion is retracted from one end in the width direction of the gypsum board and the upper surface of the gypsum board A convex actual machining portion is formed so as to form a concave actual machining portion, and the lower surface extending portion protrudes from the other end portion in the width direction of the gypsum board to be fitted into the concave actual machining portion. Thus, it is set as the board | plate material for construction characterized by shifting and fixing in the width direction.

  Further, the invention of claim 2 is that, in claim 1, chamfering is performed on the upper surface side of the top end of the upper surface extension portion of the medium density wood fiber board, and chamfering is performed on the base portion of the lower surface extension portion. It is a characteristic building board.

  Furthermore, the invention of claim 3 is the building board material according to claim 1, wherein a decorative covering is formed on the upper surface of the medium density wood fiber board.

  The invention will be described below with reference to the drawings showing embodiments of the invention.

  The building board material of the present invention can be applied to floor materials, wall materials, and ceiling materials. Here, an example of application to floor materials will be described.

  1-3 is a figure of the state which spread | laid the flooring material for construction of this invention, and this on the floor, FIG. 1 is a partial perspective view of the latter. Parts that are the same as or equivalent to those of the prior art will be given the same reference numerals and description thereof will be omitted.

  In the figure, reference numeral 10 denotes a building floor material. A long medium-density wood fiber board 11 obtained by hot-press molding has a rectangular section slightly narrower than the width of the medium-density wood fiber board 11 and has a length substantially the same. The gypsum board 12 is fixed and integrated with the upper surface of the gypsum board 12 in the width direction by, for example, a vinyl acetate water-resistant adhesive.

The long medium-density wood fiberboard 11 includes an upper surface extending portion 11a on one end side in the width direction, a lower surface extending portion 11b on the other end side, and further chamfered on the upper surface side of the distal end of the upper surface extending portion 11a. 11c, and chamfering 11c is applied to the base portion of the lower surface extending portion 11b. As a specific example of the size, the thickness is 2.7 mm, the width is 303 mm, and the length is 1818 mm. And the upper surface extension part 11 is also the same.
a has a thickness of 1.35 mm and an extension amount of 3.5 mm, and the lower surface extension portion 11b has a thickness of 1.35 mm and an extension amount of 2.5 mm.

The gypsum board 12 to which the medium density wood fiber board 11 is attached has a rectangular cross section slightly narrower than the width of the medium density wood fiber board 11 and is almost the same length as the medium density wood fiber board 11. On the upper surface of the long gypsum board 12, the upper surface extending portion 11 a is retreated (about 15 to 20 mm as an example) from the width direction end of the gypsum board 12, and a concave actual processing portion is formed between the upper surface of the gypsum board 12. 1
5 is formed so that the lower surface extending portion 11b protrudes from the end portion in the width direction of the gypsum board 12 (as an example, about 20 mm) to form the convex actual processing portion 16 that fits into the concave actual processing portion 15. In this way, the medium density wood fiber board 11 is fixedly integrated by shifting in the width direction. An example of the size of the gypsum board 12 is a thickness of 9.5 mm, a width of 300 mm, and a length of 1818 mm. Therefore, when the medium density wood fiber board 11 is spread, a gap of 3 to 5 mm is formed between the gypsum boards 12 to prevent the adjacent gypsum boards 12 from contacting each other.

Referring to FIG. 2, on the upper surface of the medium-density wood fiberboard 11, a decorative covering (for example, 0.3 mm thick) 4 such as a veneer made by thinly cutting high-grade wood, a decorative sheet of synthetic resin, or a decorative sheet such as printing paper. Is formed by coating or the like. Therefore, the medium-density wood fiberboard 11 can be given a high-grade feeling by being coated with a decorative covering body 4 such as a high-grade wood or a decorative sheet on which various patterns are printed on a surface lacking in aesthetic sense.

  Further, by applying the surface of the decorative covering 4 with an acrylic resin paint or the like, surface protection, transparency and gloss can be imparted.

The medium-density wood fiber board 11 that is heat-compressed by this hot-press molding is a material obtained by making wood into fine fibers, including an adhesive, and heat-compressing it to a medium density, abbreviated as MDF, homogeneous Easy to process. Medium density wood fiberboard compressed to a thickness of about 6 mm (average specific gravity 0.75 to 0.8
), As described above, there is a specific gravity gradient in which the specific gravity of the central portion in the thickness direction is small (for example, 0.4) and the specific gravity of the surface layer is large (for example, 0.9). The medium density wood fiber board 11 compressed to a thickness of 2.5 to 3.0 mm has a surface layer with a specific gravity of 0.9, the central portion is not so lowered and is almost uniform, and this specific gravity is on the sole of the foot. Has enough elasticity to feel.

  On the other hand, what is larger than this specific gravity and finished to a high density or ultra high density by high compression is called a high density wood fiber board (abbreviated as HDF) and is adopted as a harder floor than usual.

  Many of the flooring materials 10 thus manufactured are made to correspond to the concave actual processing portion 15 and the convex actual processing portion 16 on the underlaying material 7 such as a joist, crosspiece or panel (thickness of about 12 mm) not shown. Arrange from the end while inserting. 1 and FIG. 3 is applied to the surface of the gypsum board 12 spreading in front of the concave actual processing portion 15 of the building floor 10 while applying the above-described adhesive to each building floor 10. A mold tucker core 14 is driven in and fixed to the underlaying material 7, and flooring is performed as shown in FIG. The tacker core 14 is driven by being pressed against a widened surface using a not-shown tucker which is a handy tool such as a staple which is operated with one hand. Although a fixing method using a tucker is shown here, it is needless to say that other fixing methods such as nails and screws can be adopted.

  In the above description, the building floor material 10 is spread in the width direction, but may be spread in the longitudinal direction of the building floor material 10. Therefore, it is also necessary to form the upper surface extending portion and the lower surface extending portion in the medium density wood fiber board 11 in the longitudinal direction, and to similarly shift the medium density wood fiber board 11 and the gypsum board 12 in the longitudinal direction.

  When flooring is performed with the building floor material 10, a joint 13 having a V-shaped groove is formed between the adjacent building floor materials 10 by chamfering 11 c. This joint 13 becomes an accent and corresponds to some expansion and contraction.

  As described above, the medium density wood fiber board 11 has a large specific gravity because the upper surface extending portion 11a and the lower surface extending portion 11b are rolled to a thin thickness. Therefore, the specific gravity is average in any of the thickness directions. Therefore, it is possible to provide a strong building board material that is not broken or cracked not only during transportation and work but also in fixing work such as tucker work.

  Moreover, since the gypsum board 12 with a small expansion coefficient and fire resistance is lined, the expansion and contraction of the medium density wood fiber board 11 is suppressed, the joints 13 are not raised, and no gaps are formed. It is possible to provide a building board 10 having good fire resistance, and it is possible to provide a building board having increased fire resistance. Moreover, the medium density wood fiber board 11 which is sticky and hard is fragile, complements the disadvantages of the soft gypsum board 12, and the board material 10 having excellent properties can be provided together.

  In addition, a suitable decorative sheet 4 is stretched on the surface of the medium density wood fiber board 11 to improve the appearance of the medium density wood fiber board 11 and the hygroscopicity so that it is smooth, aesthetic and water resistant. Can be provided.

  Therefore, by using such a building plate material for floors, walls, and ceilings, it is possible to provide a building having good workability, rigidity, soundproofing and fire resistance. In particular, when used on the ceiling or floor between the upper and lower floors, it has a great effect in that it is excellent in sound insulation, so that it can prevent the sound from passing to the upper and lower floors.

It is a fragmentary perspective view of the flooring state of the building floor material which is one Example of the board | plate material for construction of this invention. FIG. 2 is an end view of the building floor material of FIG. 1. It is AA sectional drawing shown in FIG. It is sectional drawing similar to the conventional FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 4 ... Cosmetic covering 7 ... Underlay material 10 ... Building flooring 11 ... Medium density wood fiber board 11a ... Upper surface extension part 11b ... Lower surface extension part 11c ... Chamfer 12 ... Gypsum board 13 ... Joint 14 ... Tucker core 15 ... Concave actual processing part 16 ... Convex actual processing part

Claims (3)

A long medium-density wood fiberboard having an upper surface extending portion at one end in the width direction and a lower surface extending portion at the other end is substantially the same in a rectangular cross section slightly narrower than the width of the medium-density wood fiberboard. On the upper surface of the elongated gypsum board, the upper surface extending portion is retracted from one end in the width direction of the gypsum board to form a concave actual processing portion between the upper surface of the gypsum board, and The lower surface extending portion protrudes from the other end portion in the width direction of the gypsum board and is shifted and integrated in the width direction so as to form a convex actual processing portion that fits into the concave actual processing portion. Architectural board material characterized by that. The building board according to claim 1, wherein a chamfering is performed on a tip upper surface side of the upper surface extension portion of the medium density wood fiber board, and a base portion of the lower surface extension portion is chamfered. The building board according to claim 1, wherein a decorative covering is formed on the upper surface of the medium density wood fiber board.

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