JP2005153455A - Woody laminated sheet - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent the grain pattern of needle-leaf tree veneer from appearing on the surface of a woody laminated sheet using the needle-leaf tree veneer. <P>SOLUTION: First needle-leaf tree veneer 3 and a second fiberboard 4 of which the density is 0.70-1.2 g/cm<SP>3</SP>higher than that of a first fiberboard 2 with a density of 0.40-0.80 g/cm<SP>3</SP>, are successively laminated on one side of the first fiberboard 2 while second needle-leaf tree veneer 6 and back needle-leaf tree veneer 7 are successively laminated to the other surface of the first fiberboard 2 to constitute the woody laminated sheet. It is preferable that the density of the second fiberboard is larger than that of the first fiberboard by 0.15 g/cm<SP>3</SP>or above. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a wood laminate used mainly as a building material such as a floor board, a wall board, and a ceiling board.

  As a material for wood laminates used as building materials, veneer has been widely used in the past, but in recent years it has become difficult to stably obtain a large amount of high quality veneers due to the depletion of natural wood resources. . On the other hand, fiberboards made from wood and other plant fibers as the main raw material, then defibrated and then solidified with an adhesive, are relatively easy to obtain, and the surface is smooth and hard. This is used as a material for wood laminates.

For example, as disclosed in Patent Documents 1 and 2 below, it is known that a wood substrate such as lauan is laminated on both sides of a fiber substrate, and a fiber plate surface plate is laminated on each wood substrate. It has been.
Japanese Examined Patent Publication No. 6-057441 Japanese Utility Model Publication No. 6-016743

  However, as a wood veneer used for the conventional wood laminate as disclosed in the above-mentioned Patent Documents 1 and 2, a hardwood veneer such as Lauan with small grain pattern irregularities is used and laminated on the surface The wood grain pattern of the veneer is prevented from appearing on the fiberboard. As mentioned above, hardwood veneers such as Lawan have become difficult to obtain high-quality materials, so it is conceivable to use coniferous veneers instead. Since it is larger than a single plate and this grain pattern appears on the surface of the wood laminate through the fiberboard, it is not preferable.

  Accordingly, an object of the present invention is to eliminate the disadvantages of the prior art described above, and to prevent a wood grain pattern on a softwood veneer from appearing on the surface in a wood laminate using a softwood veneer.

As means for solving the above problems, the wood laminate according to the present invention has a first softwood veneer on one side of the first fiberboard that has a density range of 0.40 to 0.80 g / cm ³ , and A second fiber board having a density range of 0.70 to 1.2 g / cm ³ and higher density than the first fiber board is sequentially laminated, and on the other surface of the first fiber board, A second softwood veneer and a backboard softwood veneer are sequentially laminated.

The first fiberboard is a relatively low density soft fiberboard selected from a density range of 0.40 to 0.80 g / cm ³ , and a medium density fiberboard (MDF) is used as the first fiberboard corresponding to the first fiberboard. ) Is good to use. If the density of the first fiberboard is less than 0.40 g / cm ³ , the fiberboard itself is too soft, and the grain pattern irregularities of the first softwood veneer laminated thereon are the first fiberboard. It bites too much, causing peeling of the second fiberboard and the softwood veneer stuck to it and a decrease in strength as a whole of the wood laminate. On the contrary, when the density of the first fiber board exceeds 0.80 g / cm ³ , the fiber board itself becomes too hard, and the grain pattern of the first softwood veneer laminated thereon bites into the fiber board. It is difficult to cause a grain pattern to appear on the surface of the wood laminate, and increases the weight.

As the first fiberboard is softer and softer, the grain pattern of the first softwood veneer laminated on the first fiberboard is likely to bite (or sink). Of these, a soft fiber board having a relatively small density, for example, a density of 0.40 to 0.60 g / cm ³ is preferable. On the other hand, when forming the fruit on the wood laminate, it is preferable to select from a hard fiberboard having a relatively high density, for example, a density of 0.60 to 0.80 g / cm ^{3 in} the above range.

The second fiber board is a relatively high density and hard fiber board selected from a density range of 0.70 to 1.2 g / cm ³ , and the grain pattern of the first softwood veneer located below is transferred. It is not to be made and has excellent impact resistance, scratch resistance and caster resistance. A medium density fiber board (MDF) or a hard fiber board (hard board) is used as the second fiber board having such a density range. When the density of the second fiber board is less than 0.70 g / cm ³ , the fiber board is too soft, and thus the wood grain pattern of the first softwood veneer adhered to the fiber board is likely to appear. On the other hand, if the density of the second fiber board exceeds 1.2 g / cm ³ , the density becomes large and harder than necessary, so that the workability such as cutting and drilling is inferior and the weight is increased. The workability is also deteriorated. In addition, the manufacturing conditions of the high-density fiberboard become strict, making it difficult to manufacture and making it economically disadvantageous.

The density of the second fiber board is within the above range and is larger than the density of the first fiber board, and preferably the density difference with the first fiber board is 0.15 g / cm ³ or more. It is. As a result, the second fiberboard is harder than the first fiberboard by the difference in density, and the first softwood veneer is sandwiched between the first fiberboard and the second fiberboard. In this case, the unevenness of the grain pattern on the first fiberboard side bites into the soft first fiberboard and sinks, but the unevenness of the grain pattern on the second fiberboard side causes the second fiberboard to be the first fiber. Since it is denser and harder than the board, it hardly penetrates, and therefore the grain pattern of the coniferous single board does not appear on the surface of the wood laminate. For example, when a first fiber board having a density of 0.80 g / cm ³ is selected, a second fiber board having a density of 1.0 g / cm ³ is selected.

  As 1st and 2nd softwood veneer stuck on the front and back of the 1st fiberboard, and backboard softwood veneer stuck on the back of the 2nd softwood veneer, Among them, it is preferable to use a material having as few nodes as possible and having good workability, for example, a single plate such as a pine, too much or cypress.

  The fiber directions of the first and second softwood veneers attached to the front and back of the first fiberboard are arranged so as to be in substantially the same direction. On the other hand, the fiber direction of the softwood veneer adhered as the back plate is arranged so as to be substantially orthogonal to the fiber direction of the first and second softwood veneers. The first and second softwood veneers are placed opposite to each other on the front and back sides of the first fiberboard, so that the front and back balance is good and the wood laminate is perpendicular to the board surface (up and down (Direction) can be prevented. Further, the back plate coniferous veneer is attached to the back side of the second softwood veneer so that the fiber direction is orthogonal to the second softwood veneer. The dimensional change in the hand direction can be reduced. In general, the shrinkage due to the change in moisture content of the veneer is small in the fiber direction and greatly expressed in the direction orthogonal to the fiber direction, so two softwood veneers are stuck with their fiber directions approximately orthogonal to each other. Therefore, the dimensional change in any direction can be minimized. In this regard, in Patent Documents 1 and 2, a fiberboard is used as the back plate. However, although the fiberboard is homogeneous and isotropic, a dimensional change accompanying a change in moisture content is in the fiber direction of the single plate. Since it is larger than a dimensional change, according to the laminated structure of this invention using a single board as a backplate, the wooden laminated board which was further excellent in dimensional stability is obtained.

  Arbitrary cosmetics can be laminated and adhered to the surface side of the wood laminate of the present invention according to its application. As the decorative material, natural veneer obtained by cutting natural wood, non-woven fabric, paper, synthetic resin sheet such as olefin resin, vinyl chloride resin, polyester resin, and acrylic resin can be used. A decorative material may be obtained by printing various patterns on a flexible sheet material.

  According to the wood laminate of the present invention, the first softwood veneer is between the first fiberboard of the relatively low density and soft core layer and the second fiberboard of the relatively high density and hard surface layer side. The first fiber board side unevenness of the first fiberboard side of the first softwood veneer cuts into the soft first fiberboard and sinks into the second fiberboard side wood grain. The unevenness of the pattern hardly penetrates because the second fiberboard is dense and hard, and therefore, the grain pattern of the coniferous single board does not appear on the surface of the wood laminate.

An embodiment of a wood laminate according to the present invention is shown in FIG. This wood laminate 1 is used as a floor board, and has a density (0.70 g / cm ³ in this embodiment) within a range of 0.40 to 0.80 g / cm ³ provided at the approximate center in the thickness direction. The fiberboard 2 having the fiberboard, the softwood veneers 3 and 6 laminated and bonded to both front and back surfaces of the fiberboard 2, and 0.70 to 1.2 g / laminated and bonded to the surface of the front-side softwood veneer 3 higher density than and fiber board 2 be in the range of cm ³ and fiberboard 4 with (1.0 g / cm 3 in this ^embodiment), the back is laminated stuck to the back surface of the back side softwood veneer 6 It has a laminated structure in which a decorative material 5 made of a synthetic resin sheet or the like printed with a natural veneer or various wood grain patterns is attached to the surface of the fiber board 4.

  The thickness of each laminated material in this example is 3 mm for the fiberboard 2, 2 mm for the softwood veneers 3 and 6, and 2.5 mm for both the fiberboard 4 and the backboard softwood veneer 7. 12 mm (ignoring the thickness of the decorative material 5).

  The wood laminate 1 has a substantially rectangular shape in plan view, and a male fruit 8 is formed on two adjacent sides, and a female fruit 9 that fits the male fruit 8 is formed on the other two sides. . The male fruit 8 in the wood laminate 1 is mainly formed of the fiber board 2. That is, it cut | disconnected so that it might stop within the thickness range of the softwood single board 3 and 6 from the front and back both sides, and the front and back were coat | covered with the remaining part of the softwood single board 3 and 6 while making the fiber board 2 the main It is said to be Yami 8.

  Since the female fruit 9 connects the wooden fiberboards by fitting the male fruit 8 of the adjacent wooden laminate 1, the female fruit 9 has a shape complementary to the male fruit 8. That is, in this embodiment, the female fruit 9 is formed by cutting out the entire thickness of the fiberboard 2 and part of the thickness of the front and back coniferous single plates 3 and 6.

  In this wood laminate 1, the main part of the male fruit 8 is uniform and is formed of a relatively low density and soft fiber board 2, so that actual processing is easy and there is no crack or chipping. A defect-free fruit can be formed. Further, it is easy to drive a fixing nail at the base end of the male fruit 8, and the wood laminates 1 are reliably connected to each other.

This wood laminate 1 is manufactured as follows. First, a fiber board having a density of 0.70 g / cm ³ and a thickness of 3 mm as the first fiber board 2, and a fiber board having a density of 1.0 g / cm ³ and a thickness of 2.5 mm as the second fiber board 4, A 1 mm thick single veneer is prepared as the first and second softwood single plates 3 and 6, and a 2.5 mm thick single veneer is prepared as the back plate softwood single plate 7.

Next, a back plate softwood veneer 7 made of a 2.5 mm thick single veneer, a second softwood single piece made of a 2 mm thick veneer on the plate surface of the lower die of the press for pressing. Board 6, first fiber board 2 made of fiber board having a density of 0.70 g / cm ³ · 3 mm, first softwood single board 3 made of 2 mm thick single board and density 1.0 g / cm ³ · 2 The second fiber plate 4 made of a fiber plate having a thickness of 5 mm is placed in this order.

  At this time, a thermoplastic resin adhesive such as vinyl acetate resin or isocyanate resin, or a thermosetting resin adhesive such as urea / melamine resin, polyurethane resin, polyester resin, or epoxy resin is applied between the plate materials. . Further, the first and second softwood veneers 3 and 6 are arranged so that the fiber directions thereof are substantially the same, and the fiber directions of the backboard softwood veneers 7 are substantially orthogonal to these.

Next, the surface of the upper die of the press machine for pressing is pressed against the uppermost fiberboard 4, and the five laminated sheets are pressed at room temperature (when a thermoplastic resin adhesive is used) or 80- Heat pressing at 140 ° C. (when thermosetting resin adhesive is used). The pressure in this case is about 5 to 15 kgf / cm ² .

  After press-molding the wood laminate in this way, a synthetic veneer and various wood grain patterns are printed on the surface of the uppermost fiberboard 4 using a thermoplastic resin adhesive such as vinyl acetate resin or isocyanate resin. A decorative material 5 made of a resin sheet or the like is pasted, and the wood ends are cut to form male seeds 8 and female seeds 9, whereby the wood laminate 1 shown in FIG. 1 is manufactured.

It is sectional drawing which shows one Embodiment of the wooden laminated board concerning this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Wood laminated board 2 1st fiber board 3 1st conifer veneer 4 2nd fiber board 5 Cosmetic material 6 2nd conifer veneer 7 Back board conifer veneer 8 Male 9 Female

Claims (2)

On one surface of the first fiber board is a density range of 0.40~0.80g / cm ³ and a first softwood veneer, the a density range of 0.70~1.2g / cm ³ 1 The second fiberboard having a higher density than the first fiberboard is sequentially laminated, and the second softwood veneer and the backboard softwood veneer are sequentially laminated on the other surface of the first fiberboard. A wood laminate characterized by comprising The wood laminate according to claim 1, wherein the density of the second fiber board is 0.15 g / cm ³ or more higher than the density of the first fiber board.

Images