JP2008068421A - Manufacturing method of composite base material - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for inexpensively manufacturing a woody composite base material excellent in surface smoothness and surface hardness as a base material, hard to cause warpage (especially width warpage) and gap (especially a gap in a width direction) and suitable for double-sided decorative bonding. <P>SOLUTION: The manufacturing method of the composite base material obtained by stacking and bonding medium specific gravity fiberboard to both front and back of a woody plate has a process for dividing the medium specific gravity fiberboard in its thickness direction to obtain sheets and a process for stacking and bonding the sheets, a plurality of woody veneers and in this order by one clamping so that the hard layer sides of the sheets are directed outside, an odd number of the woody veneers are used so that the fiber directions of them almost cross at a right angle each other, the fiber directions of the woody veneer of the second layers from the surface and back sides of the composite base material are allowed to be orthogonal to the longitudinal direction of the composite base material almost. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a method for producing a wood composite substrate, and more particularly to a method for producing a wood composite substrate by laminating and bonding thin sheets of medium specific gravity fiber boards to the surface of a wood board.

  Conventionally, what used wood boards, such as a plywood, as a base material, such as a flooring, has been used generally well. In addition, taking into account the surface smoothness of the base material and the like, it has often been carried out to use a single medium specific gravity fiber board as the base material. The medium specific gravity fiber board is superior in surface smoothness and surface hardness compared to a wood board such as plywood. However, on the other hand, the dimensional change is large by absorbing and releasing moisture and moisture around it, resulting in thickness fluctuations and warping, for example, as a base material for flooring In such a case, there is a problem that a gap is generated between adjacent floor materials. Furthermore, when used as a base material for flooring, there is a problem that bending strength and the like are insufficient compared to plywood. Further, when used as a base material for flooring for floor heating, the medium specific gravity fiber board has a problem that drying shrinkage due to heat is severe and a gap is formed between adjacent flooring materials.

  On the other hand, the plywood is inferior to the medium specific gravity fiber board in terms of surface smoothness and surface hardness, but is strong against warping and stable in strength, and used as a base material for flooring for floor heating. In this case, the plywood is relatively resistant to drying shrinkage due to heat, and there is much less fear that a gap will be formed between adjacent flooring materials, compared with a medium specific gravity fiber board, and the cost is relatively low. Therefore, development of a composite base material that takes advantage of both advantages is desired, and various composite base materials in which the medium specific gravity fiber board 12 is laminated and bonded to the surface of the plywood have been studied.

  As shown in FIG. 4, the conventional composite substrate 11 is a surface obtained by polishing one surface of a medium specific gravity fiber board 12 with a thickness of about 3 mm with a polishing paper or the like in consideration of adhesion suitability and appropriately roughening the surface. Is laminated and adhered to the surface of the wooden board 13 (usually one side of the wooden board 13) so as to be in contact with the wooden board 13. In this way, a two-stage manufacturing process in which a single wood board is laminated and bonded in advance to produce a wooden board 13 such as a plywood, and then the medium specific gravity fiber board 12 is laminated and bonded to the wooden board 13. Processes have been used frequently.

  The wood board 13 is manufactured, for example, by using a plywood of about 3 to 7 plies as a base material, and laminating and bonding a medium specific gravity fiber board 12 with a thickness of about 3 mm on the surface of the base material. When the composite base material 11 of plywood and medium specific gravity fiber board manufactured in this way is used as a base material of a floor board for floor heating, for example, the drying shrinkage rate of the medium specific gravity fiber board 12 on the surface is that of plywood. It is relatively stronger than the case of using a medium specific gravity fiber board alone as a base material, but is weaker to the gap than a single plywood alone, and the drying shrinkage ratio of the medium specific gravity fiber board 12 is large. This often caused gaps on the floorboard surface.

  In addition, in the case of the conventional composite substrate 11 shown in FIG. 4, the middle specific gravity fiber board 12 side particularly greatly expands due to moisture absorption due to the influence of moisture or moisture from under the floor or on the floor during use as a floor board, and then, especially by drying. The medium specific gravity fiber board 12 side contracted greatly, and warping was likely to occur by repeating such expansion and contraction. In the case of warping in the longitudinal direction of the floorboard, either warping (warping in the direction in which the central part of the base material is convex upward) or reverse warping (warping in the direction in which the central part of the base material is convex downward) However, in the case of warping due to warpage in the longitudinal direction, it can be solved relatively easily by adapting to the surface of the floor base material due to the weight of the floor board itself during construction, and it is also relatively easy by nailing during construction. It was solved.

  However, in the case of reverse warpage due to warpage in the longitudinal direction, it has been difficult to eliminate the warpage by the weight of the floorboard or nailing during construction. Further, warpage in the width direction of the floor board is also likely to occur, and in the case of warping in the width direction, it has been extremely difficult to eliminate both upward warping and reverse warping. In other words, it is extremely difficult to eliminate with the dead weight of the floor board, and there are too many nailing places to prevent width warping by nailing at the time of construction, and there is a big problem in workability. The cause of these warpages was also largely due to the difference in expansion and contraction during moisture absorption drying between the wood board 13 such as plywood and the medium specific gravity fiber board 12 laminated and bonded to the surface thereof. Further, the medium specific gravity fiber board 12 is more expensive than a plywood or the like and has been a major factor in increasing the cost.

  Therefore, as a result of various investigations for eliminating the above-described gaps, warpage, and cost increase, it has been devised to use a medium specific gravity fiber board having a thickness smaller than about 3 mm. Description of a wood material in which a medium specific gravity fiber board is divided into two parallel to the surface to produce a medium specific gravity fiber board with a thickness of about 1.5 mm, and the adhesive surface of the medium specific gravity fiber board is bonded and integrated with the wood core material. There is. (For example, refer to Patent Document 1).

JP-A-10-193309 (page 1-3, FIGS. 1 and 2).

  However, in the above-mentioned conventional manufacturing method of the composite base material of medium specific gravity fiber board and wood board, for example, as the wood board 13, the finished plywood is used as a laminate, and the medium specific gravity fiber board 12 is disposed on one side thereof. In a so-called single-sided manufacturing method of manufacturing by laminating and bonding, warping tends to occur as a composite substrate. In addition, the medium specific gravity fiber board manufactured by the double-sided bonding method has a medium specific gravity fiber board thickness of at least about 3 mm. Therefore, not only is it expensive, but also a floor heating floor material is used. When used as a substrate, the dimensional stability was inferior due to drying shrinkage due to heat, and the occurrence of gaps was inevitable. Moreover, when the surface of the medium specific gravity fiber board on the side to be bonded to the wood board such as plywood is a hard layer, it has been a cause of adhesion failure.

  Further, in this way, the wood veneer is laminated and bonded in advance to produce the wood board 13 such as plywood, and then the medium specific gravity fiber board 12 is laminated and bonded to the wood board 13. The manufacturing method by the multi-layered laminating process is a complicated manufacturing process, and the laminating and bonding process is troublesome twice, and the cost increase for that is inevitable.

  Further, in the manufacturing method described in JP-A-10-193309, the medium specific gravity fiber board is divided in the thickness direction in the first step to obtain a thin plate, and the wood core is obtained in the second step. The material (plywood, laminated wood, etc.) is manufactured, and these are roughly divided into three steps, such as laminating and bonding them in the third step, and the manufacturing process is complicated and disadvantageous to the manufacturing cost. It was.

  In addition, when used as a floor heating floor plate, the floor plate is greatly warped, and in particular, it is difficult to eliminate the reverse warp in the longitudinal direction and the warp in the width direction. There is also a problem that gaps are likely to occur between adjacent floorboard surfaces. In addition, since the floorboard is generally long, the number of connection points between the long side surfaces with the adjacent floorboard after construction is overwhelmingly larger than the connection points between the short side surfaces. Therefore, reducing the gap in the width direction (the gap between the longitudinal side surfaces) is important for the finished construction of the floor board when used as a floor board for floor heating.

  Further, since the floor board is generally long, the warp in the longitudinal direction after the construction is easy to be eliminated by its own weight, but the reverse warp in the longitudinal direction and the warp in the width direction are difficult to eliminate. Therefore, it is important to eliminate the reverse warp in the longitudinal direction and the warp in the width direction. Moreover, the use of the composite base material which can be used not only for single-sided decorative sticking but also for double-sided decorative sticking has been increasing in recent years. Therefore, it has become important to respond to the demand for base materials for double-sided pasting.

  The object of the present invention is that the substrate has excellent surface smoothness, excellent surface hardness, warpage (especially width warpage), gaps, particularly gaps in the width direction (gap between longitudinal side surfaces). An object of the present invention is to provide a method for producing a wooden composite base material that is less likely to occur, excellent in dimensional stability, and suitable for double-sided decorative sticking by simplifying and reducing the production process.

  The method for producing a composite base material according to claim 1, which has been made to solve the above-mentioned problems, is a method for producing a composite base material obtained by laminating and bonding medium specific gravity fiber boards on both front and back surfaces of a wooden board, Dividing the specific gravity fiber board in the thickness direction, obtaining a thin plate of medium specific gravity fiber board, one side comprising a hard layer and the other side comprising a soft layer, and sandwiching a plurality of wood veneers between the thin plates And laminating and bonding the thin plate, the plurality of wood veneers, and the thin plates in this order, with the hard layer side of the thin plate facing outward and the soft layer side of the thin plate facing the wood veneer side It is characterized in that a composite base material is obtained by laminating and bonding by one press.

  According to such a method for manufacturing a composite substrate according to claim 1, in the first step, the medium specific gravity fiber board is divided in the thickness direction, and one side is made of a hard layer and the other side is made of a soft layer. A thin plate of medium specific gravity fiber board is obtained, and in the second step, the thin plate of medium specific gravity fiber plate, a plurality of wood single plates, and the thin plate are arranged in this order, and the hard layer side of the thin plate of medium specific gravity fiber plate is placed outside. The method of manufacturing a wood composite base material by laminating and adhering the soft layer side of the thin plate toward the wood single plate side with a single press, so as in the case of the conventional method, for example, in the first step A medium specific gravity fiber board is prepared, and in the second step, a wood veneer is laminated and bonded in advance to produce a plywood. Subsequently, in the third step, a medium specific gravity fiber board is laminated on the plywood. It can be avoided that the process of laminating and bonding the medium specific gravity fiber board and the wood board is troublesome twice. Therefore, one step can be omitted, which is suitable for reducing the manufacturing cost.

  In addition, the wood composite base material produced by this manufacturing method is such that the hard layer side of the thin plate of the medium specific gravity fiber board faces outward, the soft layer side of the thin plate faces the wood single plate side, and two As a composite base material for double-sided decorative sticking, a hard layer is exposed on both sides of the composite base material, because a plurality of wood veneers are sandwiched between thin sheets of specific gravity fiber boards and laminated together in a single laminating and bonding process. Is preferred. Furthermore, since the medium specific gravity fiber board in contact with the wood single board is on the soft layer side, it is suitable for the adhesion suitability between the wood single board and the medium specific gravity fiber board.

  The method for manufacturing a composite substrate according to claim 2 is the method for manufacturing a composite substrate according to claim 1, wherein the wood veneer is an odd number and the fiber directions thereof are substantially orthogonal to each other. It is characterized by laminating and bonding so that the fiber direction of the wood veneer of the second layer from the front side and the second layer from the back side is substantially orthogonal to the longitudinal direction of the composite substrate.

  According to the method of manufacturing a composite base material according to claim 2, the wood veneer is an odd number, the fiber directions thereof are substantially orthogonal to each other, and the second layer and the back surface side from the surface side of the composite base material. From the manufacturing method of laminating and bonding so that the fiber direction of the second layer of wood veneer is substantially orthogonal to the longitudinal direction of the composite base material, the width warpage of the composite base material and the gap in the width direction can be made extremely small It becomes possible.

  The reason for this is as follows. That is, after the construction, it is a manufacturing method in which the fiber direction of the wood single plate in contact with the medium specific gravity fiber plate is laminated and bonded so that the longitudinal direction of the composite base material is substantially orthogonal to the longitudinal direction of the composite base material (parallel to the width direction of the composite base material). Moisture absorption and dehumidification of the front and back medium specific gravity fiber boards due to the very small change in the fiber direction of the wood veneer due to moisture absorption and desorption, and the very small change in the fiber direction of the wood veneer in contact with the medium specific gravity fiber board Dimensional change associated with, that is, dimensional expansion and contraction is efficiently suppressed. This is extremely advantageous for the width warpage of the composite substrate. Further, particularly when used as a floor board for floor heating, the fiber direction of the wood veneer has a very small amount of drying shrinkage, and therefore the gap in the width direction of the floor board surface can be kept very small.

  According to the method for producing a composite base material according to claim 1, the medium specific gravity fiber in which the medium specific gravity fiber plate is divided in the thickness direction in the first step and one side is composed of a hard layer and the other surface is composed of a soft layer. A thin plate of the plate is obtained, and in the second step, the thin plate of the medium specific gravity fiber plate, a plurality of wood single plates, the thin plate in this order, and the hard layer side of the thin plate of the medium specific gravity fiber plate is directed outward, A method for producing a wood composite base material by laminating and adhering a soft layer side of a thin plate to a wood single plate side by a single press, so that, for example, in the first step, a medium specific gravity fiber is used as in the conventional method. A board is prepared, and in the second step, a wood veneer is laminated and bonded in advance to produce a plywood. Subsequently, in the third step, a medium specific gravity fiber board is laminated and bonded to the plywood. Thus, it can avoid that the lamination | stacking adhesion | attachment process of a medium specific gravity fiber board and a wooden board becomes troublesome twice. Therefore, one step can be omitted, which is suitable for reducing the manufacturing cost.

  In addition, the wood composite base material produced by this manufacturing method is such that the hard layer side of the thin plate of the medium specific gravity fiber board faces outward, the soft layer side of the thin plate faces the wood single plate side, and two As a composite base material for double-sided decorative sticking, a hard layer is exposed on both sides of the composite base material, because a plurality of wood veneers are sandwiched between thin sheets of specific gravity fiber boards and laminated together in a single laminating and bonding process. Is preferred. Furthermore, since the medium specific gravity fiber board in contact with the wood single board is on the soft layer side, it is suitable for the adhesion suitability between the wood single board and the medium specific gravity fiber board.

  According to the method for producing a composite base material according to claim 2, the wood veneer is an odd number, the fiber directions are substantially orthogonal to each other, and the second layer from the front side and the second layer from the back side of the composite base material. Because of the manufacturing method in which the fiber direction of the wood veneer of the eye is laminated and bonded so that the longitudinal direction of the composite base material is substantially orthogonal to the longitudinal direction of the composite base material, it becomes possible to extremely reduce the width warpage and the gap in the width direction of the composite base material. .

  The reason for this is as follows. That is, after the construction, it is a manufacturing method in which the fiber direction of the wood single plate in contact with the medium specific gravity fiber plate is laminated and bonded so that the longitudinal direction of the composite base material is substantially orthogonal to the longitudinal direction of the composite base material (parallel to the width direction of the composite base material). Moisture absorption and dehumidification of the front and back medium specific gravity fiber boards due to the extremely small change in the fiber direction of the wood veneer due to moisture absorption and desorption Dimensional change associated with, that is, dimensional expansion and contraction is efficiently suppressed. This is extremely advantageous for the width warpage of the composite substrate. Further, particularly when used as a floor board for floor heating, the fiber direction of the wood veneer has a very small amount of drying shrinkage, and therefore the gap in the width direction of the floor board surface can be kept very small.

  Details of the present invention will be described with reference to the drawings. FIG. 1 is a schematic diagram showing the process of dividing the medium specific gravity fiber board of the present invention, FIG. 2 is a schematic diagram showing the process of laminating and bonding the thin plate of the present invention and the wood veneer, and FIG. 3 is the composite substrate of the present invention. It is a perspective view shown.

  1-3, an example of the manufacturing method of the composite base material of this invention is described in detail. The medium specific gravity fiber board 1 of the present invention is divided in the thickness direction, and a thin plate 2 of the medium specific gravity fiber board 1 is obtained. The front layer and the back layer of the medium specific gravity fiber board 1 are composed of a hard layer K having a high density, and the substantially central portion is composed of a soft layer N having a low density.

  In this example, the state divided into two in the thickness direction is shown as an example. In this example, two divisions of a medium specific gravity fiber board with a thickness of about 3 mm are illustrated, but it is of course possible to have a multilayer division of two or more divisions. For example, in the case of three divisions, the outer two layers of thin plates 2 are used, and the central thin plate cannot be used because the hard layer K does not exist. Three divisions are effective when it is desired to make the outer two layers as thin as possible. It is preferable to make the outer two layers as thin as possible when the composite substrate 4 is used. For example, when it is used as a base material for a floor board for floor heating, it is dried and contracted by heat, which makes it difficult to produce surface gaps, thereby making it suitable as a floor board base material.

  Further, it may be a multilayer division of four or more divisions. It becomes a suitable thing as the composite base material 4 from about 4 divisions to about 6 divisions. However, it is not preferable to make the medium specific gravity fiber board having a thickness of about 3.0 mm into multiple divisions of 7 or more. When the thickness of the medium specific gravity fiber board 1 is thin, it is about 3.0 mm. When the medium specific gravity fiber board 1 having a thickness of about 3.0 mm is divided into multiple layers, the thickness of the thin plate 2 per sheet becomes too thin and is strong. Problems arise. Accordingly, the thin plate 2 may be divided so as to have a thickness of about 0.5 to 1.0 mm. With such a thickness, there is no risk of damage due to insufficient strength. It may be equally divided in the thickness direction or may be divided into different thicknesses. As illustrated in this example, when the medium specific gravity fiber board 1 is divided into two, the thin plate 2 after the division is composed of a hard layer K on the outer surface (non-divided surface) and the other surface (divided surface) is It is composed of a soft layer N.

  The composite base material 4 produced by the production method of the present invention includes the thin plate 2, a plurality of (three in this example) wood single plate 3, the thin plate 2 in this order, and the hard plate K side of the thin plate 2. With the soft layer N side facing the wood veneer 3 side, and a total of five layers are laminated and bonded by one press. Since the wood composite base material 4 is manufactured by laminating and bonding by a single press, the plywood is prepared by laminating the wood veneer 3 in advance, for example, as in the conventional method. Thus, it is possible to avoid the time and effort required to laminate and bond the thin plate 2 of the medium specific gravity fiber plate 1 to the plywood. The laminating and bonding step is only required to be pressed once, and therefore one step can be omitted, which is preferable for reducing the manufacturing cost.

  The wood veneer 3 is a plurality of two or more, and as a suitable example, three shown in this example are exemplified. In addition to the three sheets shown in this example, the case of five or seven sheets is suitable. If the number is too large, such as 9 or more, the amount of adhesive used is increased, and more labor is required for laminating and increasing the cost. Moreover, the material of the said wood veneer 3 can illustrate a softwood material, such as a radiata pine other than southern materials, such as a lauan, a capol, a celaya, a merapi, and a jonkon, as a suitable thing. However, it is not limited to these tree species. Considering warpage and dimensional stability during moisture absorption and drying, these wood veneers can be exemplified as suitable materials.

  As a method of dividing the medium specific gravity fiber board 1 in the thickness direction (in this example, dividing into two in the thickness direction), a slicer blade (not shown) is installed in the horizontal direction, and the medium specific gravity fiber board 1 before division is horizontally Then, it is clamped by a feed roll (not shown) and the like, forcibly advanced in the longitudinal direction, and cut and divided in the thickness direction by the blade of the slicer. At this time, some unevenness is likely to occur on the divided surface, but if the tip angle of the blade and the bias angle of the blade are set appropriately, the cutting resistance can be reduced, and large unevenness (not shown) on the divided surface is reduced. It becomes a grade which a fine unevenness | corrugation (not shown) arises. Although this fine unevenness | corrugation is not suitable as a surface at the time of becoming the composite base material 4, it is suitable as a surface of the side adhere | attached with the wood veneer 3. That is, when the thin plate 2 of the medium specific gravity fiber board 1 is pasted on the wood veneer 3 with an adhesive, the adhesive having a fine irregularity is more easily penetrated and has excellent adhesion suitability. .

  Moreover, since the composite base material 4 produced with the manufacturing method of this invention has the above structures, that is, it is the structure which laminated | stacked the medium specific gravity fiber board 1 on both front and back surfaces of the composite base material 4, and medium specific gravity. Since the hard layer K of the fiberboard 1 is laminated and bonded as the outer surface, both surfaces of the composite substrate 4 are excellent in surface smoothness and surface hardness. Moreover, since the medium specific gravity fiber board 1 is not attached on one side but on both front and back sides, it becomes difficult to warp against moisture absorption and moisture release. Moreover, since the thin plate 2 obtained by dividing the medium specific gravity fiber board 1 in the thickness direction is used, the thickness as the medium specific gravity fiber board 1 is thin, and therefore dimensional stability even when used as a base material for floor heating flooring. And prevents the formation of gaps. Further, as described above, since the soft layer N of the medium specific gravity fiber board 1 is in contact with the wood board 3, there is no fear of poor adhesion.

In addition, as the adhesive for laminating, any of room temperature curing type urethane resin adhesive, acrylic modified urethane resin adhesive, urea resin adhesive, urea melamine co-condensation resin adhesive, phenol resin Examples of suitable adhesives include resorcinol resin adhesives. In addition, as an example of the lamination adhesion conditions, the adhesive application amount is about 150 to 300 g / m ² by wet, the cold pressing operation is performed using a cold press, and the pressing pressure is about 8.0 to 12.0 kg / cm ^2. The pressing temperature is normal temperature, and the pressing time is usually about 12 to 24 hours, although it depends on the adhesive. After completion of pressing, curing is performed at room temperature for about 24 hours or more to complete the lamination bonding operation. However, the bonding conditions are not limited to the above. Also, it is of course possible to use heat pressing instead of the above-described normal temperature pressing. For example, an adhesive made of a thermosetting synthetic resin or the like may be appropriately selected, and an appropriate bonding condition may be set.

  Further, a more preferable production method as the production method of the present invention is the method described below. That is, the composite base material 4 produced by this manufacturing method prepares the thin plate 2 of the medium specific gravity fiber board 1 on the front surface and the back surface, the hard layer K of each thin plate 2 faces the outside, and the soft layer N is made of a single woody material. On the side of the board, an odd number of wood veneers 3 (three in this example) are sandwiched between two thin plates 2 with their fiber directions approximately orthogonal to each other and laminated and bonded. is there. Since the number of wood veneers 3 is an odd number and the fiber directions are substantially orthogonal to each other, the dimensional change during moisture absorption or drying is extremely small, and the occurrence of warpage is further suppressed. In this case, as described above, the divided thin plate 2 of the medium specific gravity fiber plate 1 on the front surface and the back surface is laminated and bonded with the hard layer K facing outside. The adhesive and bonding conditions at the time of lamination bonding may be the conditions as described above. However, it is not limited to these adhesion conditions.

  In addition, the wood veneer 3 between the divided thin plates 2 of the medium specific gravity fiber board 1 of the front and back surfaces of the composite base material 4 of the present invention is the second layer (on the wood veneer 3 from the surface side of the composite base material 4). The first layer from the back) and the second layer from the back side of the composite substrate 4 (the bottom layer of the wood veneer 3, the third layer from the top of the wood veneer in this example), the fiber direction of the wood veneer 3 is composite It is substantially orthogonal to the longitudinal direction of the substrate 4 (substantially parallel to the width direction). The composite base material 4 manufactured in this way can have extremely small warpage and a gap in the width direction (a gap between the longitudinal side surfaces of adjacent composite base materials).

  Moreover, when sticking a surface cosmetic material (not shown) on both surfaces of the composite base material 4, the cosmetic material which consists of a thermoplastic synthetic resin sheet is suitable. For example, a soft vinyl chloride resin sheet, an olefin resin sheet, etc. can be illustrated as a suitable thing. The thickness of the decorative material is preferably about 0.1 to 0.3 mm. When the hard layer K of the thin plate 2 of the medium specific gravity fiber board 1 on both the front and back sides of the composite substrate 4 and the thermoplastic synthetic resin sheet (not shown) are bonded, as an adhesive, for example, a vinyl acetate resin adhesive, an acrylic resin Examples of suitable adhesives include urethane adhesives and urethane resin adhesives. What is necessary is just to stick using a laminator. What is necessary is just to select suitably the adhesion conditions suitable for each adhesive agent as adhesion conditions. In addition, when the surface decorative material (not shown) is attached only to the surface of the composite base material 4 and the back side is bonded to a base material (not shown), the back side of the composite base material 4 is Since the hard layer K of the thin plate 2 of the medium specific gravity fiber board 1 is exposed, it is preferable that the surface is lightly polished with a sander and the soft layer N is exposed to be suitable for adhesion to the base material. The said adhesive agent, adhesion | attachment conditions, and the adhesion method are suitable examples, and are not limited to this.

Moreover, the manufacturing procedure of the composite base material 4 of this invention is as follows.
1. A medium specific gravity fiber board 1 is prepared and divided into multiple layers in the thickness direction to obtain a thin plate 2 of medium specific gravity fiber board. In this example, it is divided into two layers.
2. A plurality of wood veneers 3 are prepared. In this example, the odd number is three.
3. The thin plate 2 of the medium specific gravity fiber board 1, the three wood single plates 3 of the medium specific gravity fiber board 1, and the thin plate 2 of the medium specific gravity fiber board 1 are assembled in this order. The thin plate 2 of the medium specific gravity fiber board 1 is structured so that the hard layer K is on the outside and the soft layer N is on the side of the wood veneer 3. At this time, as a more preferable manufacturing method, the fiber directions of the three wood veneers 3 are substantially orthogonal to each other. Further, the fiber direction of the first and third wood veneers 3 is substantially orthogonal to the longitudinal direction of the composite substrate 4, and the second sheet (the wood veneer 3 in the center) is It is made to substantially coincide with the longitudinal direction.
4). The five-layered material thus constructed is laminated and bonded with a single press using an adhesive.
5. This completes the production of the composite substrate 4 by the production method of the present invention.
6). Then, a decorative material is stuck on both sides or one side of the completed composite base material 4. In the case of single-sided bonding, it is preferable that the surface to which the decorative material is not attached is lightly polished with a sander to adhere to the base material. The sandpaper count is preferably about 120 to 240.
The description of the manufacturing procedure is as described above.

The schematic diagram which shows the process of dividing | segmenting the medium specific gravity fiber board of this invention. The schematic diagram which shows the process of carrying out the lamination | stacking adhesion | attachment of the thin board of this invention, and a wooden single board. The perspective view which shows the composite base material of this invention. Sectional drawing which shows the conventional composite base material.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Medium specific gravity fiber board 2 Thin board K Hard layer N Soft layer 3 Wood single board 4 Composite base material 11 Conventional composite base material 12 Medium specific gravity fiber board 13 Wood board

Claims (2)

A method of manufacturing a composite base material obtained by laminating and bonding medium specific gravity fiber boards on both front and back sides of a wooden board, wherein the medium specific gravity fiber boards are divided in the thickness direction, one side is composed of a hard layer and the other side is a soft layer And a step of laminating and bonding a plurality of wood veneers between the thin plates, the thin plate, the plurality of wood veneers, and the thin plate A composite substrate characterized in that a composite base material is obtained by laminating and bonding in one press, in order, with the hard layer side of the thin plate facing outward and the soft layer side of the thin plate facing the wood veneer side A method of manufacturing the material. The wood veneer is an odd number, the fiber directions thereof are substantially orthogonal to each other, and the fiber direction of the wood veneer of the second layer from the front surface side and the second layer from the back surface side is the longitudinal direction of the composite substrate. The method for producing a composite substrate according to claim 1, wherein the layers are laminated and bonded so as to be substantially orthogonal.

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