JP5511586B2 - Wood composite - Google Patents

Description

  The present invention relates to a wood composite material.

Medium-density fiberboard (laminated Veneer Lumber abbreviation: LVL) on the front and back surfaces of housing door frames, closet frames, and other fittings
There is a case where a wood composite material in which Medium Dencity Fiber Board (abbreviation: MDF) is attached with an adhesive is used. In order to improve the beauty, such a wood composite material is covered with a cosmetic material from the front surface to the back surface and used as a cosmetic composite material.

  This wood composite material has a good surface finish because a medium density fiberboard with good processability is bonded to the surface. However, since the end face of each single plate constituting the plywood or LVL is exposed on the side surface of the wood composite material, depending on the material of the plywood or LVL, concave portions such as insect holes and node holes are formed on the side surface. There is a problem that workability is poor and a sufficient finish cannot be obtained. In recent years, the quality of plywood or LVL has been drastically deteriorated, and there is a problem that a large amount of processing is required to fill the concave portions of the plywood or LVL exposed on the side surfaces.

  A conventional technique for solving such a problem is disclosed in Patent Document 1, for example. In this prior art, a long surface material and a back material made of a medium density fiber plate are joined to the front and back surfaces of a bar-shaped core material made of a single-plate laminated material, and a medium density fiber plate is further attached to each side of the core material. By providing a side material made of between the surface material and the back material, joining the end surface facing the surface material of the side material and the surface material, and joining the end surface facing the back material of the side material and the back material It is made of wood composite material with good side finish.

JP 2000-296505 A

  However, in the prior art, a plurality of single plates are arranged in the width direction to form a base material, and a side material is provided between the surface material and the back material so as to have a predetermined width dimension, and the surface material and the back material Since the side material is joined, the side material must be provided in advance in consideration of the predetermined width dimension of the wood composite material, and the width direction size of the wood composite material is restricted, and the width direction size is one by one. It is not suitable for production of different small lots. Therefore, there is a problem that production efficiency is poor.

  Further, when plywood or LVL is used as the core material, the density of the plywood or LVL and the medium density fiber board is different. Therefore, when the plywood or LVL expands due to a change in temperature or humidity, the pressing force causes the side material and the surface material. A shearing force is generated in both members at the boundary with the joint. Due to this shearing force, the surface material and the side surface material protrude outward, and a protruding portion is generated at the corner of the wood composite material. This causes a problem that the beauty of the wood composite material is impaired and the product quality is deteriorated.

  In particular, in the case of a decorative composite material in which the wooden composite material is coated with a white decorative material, the protruding portion appears on the appearance of the decorative material as a linear pattern extending in parallel to the longitudinal direction of the wooden composite material. There is a problem that the aesthetic appearance of the composite material is impaired. Further, even when the surface material and the side material are the same, when the thickness of the surface material is larger than the thickness of the side material, the side material is pushed outward by the expansion of the surface material, and the protrusion described above The problem that a part will arise arises.

  The medium-density fiberboard is made by adding an adhesive to wood fiber that has become cotton-like by defibration of wood and heat-pressing it, so it has high rigidity in the compression direction but is orthogonal to the compression direction. It is weak against external force from the direction. In the prior art, side members are disposed on both sides of the base material, adhesive is applied, and the surface material and the back material are joined while pressing, so the pressing force at the time of joining the surface material and the back material is MDF. By acting on the cracks, cracks may occur on the side surfaces of the MDF (surfaces formed in a direction orthogonal to the compression direction), which impairs the aesthetics of the wood composite material and lowers the product quality. There's a problem.

  Therefore, the object of the present invention is to improve production efficiency, prevent the side material from being pushed outward by the expansion of the core material and the expansion of the surface material, and prevent the protruding portion from being generated at the corner of the wood composite material. It is to provide a high-quality wood composite material.

The present invention consists of a long wood material, and a cross-sectional shape perpendicular to the longitudinal direction is a quadrilateral core material,
A surface material composed of a long wood material having a density higher than that of the core material and bonded to at least one surface in the thickness direction of the core material;
It consists of a long woody material having a higher density than the core material, and on at least one side in the width direction of the core material, including a side surface of the core material and a side material bonded to the side surface of the surface material bonded to the core material,
The side material is a tapered portion formed in a region joined to the surface material of the side material, and includes a first virtual flat surface including a surface opposite to a surface facing the core material of the surface material. The wood composite material has a taper portion whose thickness decreases toward a boundary line extending along an intersecting portion where the second virtual one plane including a surface facing the core material of the side surface material intersects. .

Further, the present invention is composed of a long wood material, and a core material having a quadrangular cross-sectional shape perpendicular to the longitudinal direction,
A surface material composed of a long wood material having a density higher than that of the core material and bonded to at least one surface in the thickness direction of the core material;
It is composed of a long wood material having a higher density than the core material, and includes a side material joined to at least one side surface in the width direction of the core material,
The side material is a woody composite material that is formed in a region joined to the core material of the side material and has a tapered portion that decreases in thickness as it approaches the surface material .

In the invention, it is preferable that the core material is made of particle board, and the surface material and the side material are made of medium density fiberboard.

  In the present invention, the surface material and the side material are covered with a decorative sheet.

  According to the present invention, since the surface material is bonded to one surface in the thickness direction of the core material, and the side material having the tapered portion is bonded to the side surface of the core material to which the surface material is bonded, the density is higher than that of the surface material. Even if the core material expands more than the surface material due to moisture absorption, and the side material is pressed in the direction of peeling from each side surface of the core material and the surface material by the expanded core material, the taper portion of the side material is easily moved by the pressing force. Thus, the peeling force that tends to separate from the side surface of the core material and the side surface of the surface material is reduced, so that protruding portions are prevented from occurring at the corners of the wood composite material.

  Further, even if the side material is pressed away from the side surfaces of the core material and the surface material due to the expansion of the surface material, the side surface of the core material acting on the side material and the side surface of the surface material are pushed by the deformation of the tapered portion. The pressure is reduced, and it is possible to prevent the protruding portion from occurring at the corner of the wood composite material.

  As a result, the outward expansion of the side material due to the expansion of the core material and the surface material is prevented, and the protruding portion is prevented from being formed at the corner of the wooden composite material, and the appearance of the wooden composite material is deteriorated. Can be prevented. In addition, by a simple process of forming the tapered portion on the side surface material, a wood composite material in which no protruding portion is generated at the corner portion can be realized, and productivity can be improved.

  Moreover, since a protrusion part does not arise in the corner | angular part of a woody composite material, it can prevent that the linear pattern extended in a longitudinal direction appears on a decorative sheet. Thereby, the aesthetics of the design of the wood composite material can be maintained over a long period of time.

It is a perspective view which shows the woody composite material 1 of 1st Embodiment of this invention. 1 is a cross-sectional view of a wood composite material 1. FIG. 3 is a partially enlarged view showing a joint portion of the wood composite material 1. FIG. It is sectional drawing which shows the woody composite material 2 of 2nd Embodiment of this invention. It is sectional drawing which shows the woody composite material 3 of 3rd Embodiment of this invention.

  1 is a perspective view showing a wood composite material 1 according to a first embodiment of the present invention, FIG. 2 is a cross-sectional view of the wood composite material 1, and FIG. 3 shows a joint portion of the wood composite material 1. It is a partial enlarged view.

  The wood composite material 1 of the present embodiment includes a core material 10 having a rectangular cross-sectional shape perpendicular to the longitudinal direction, a surface material 11 bonded to one surface in the thickness direction of the core material 10, and the other surface in the thickness direction of the core material 10. The back surface material 12 to be joined and the side materials 13a and 13b joined to the side surfaces in the width direction perpendicular to the longitudinal direction and the thickness direction of the core material 10 to which the surface material 11 is joined are configured.

  The core material 10 is a wood material realized by various types of plywood such as lumbar core plywood, lauan plywood, softwood plywood, parallel plywood, laminated wood, fiberboard, and particle board. In the present embodiment, the core material 10 is realized by plywood.

  The surface material 11 is made of a wood material having a density higher than that of the core material 10 and is realized by a medium density fiber board having a thickness of 2.5 mm to 9 mm in the present embodiment. The surface material 11 has the same longitudinal and width dimensions as the core material 10 and is laminated on one surface of the core material 10. The surface material 11 and the core material 10 are bonded and fixed by an adhesive such as a polyvinyl acetate emulsion adhesive.

  The back surface material 12 is made of a wood material having a density higher than that of the core material 10 and is realized by a medium density fiber board having a thickness of 2.5 mm to 9 mm in the present embodiment. The back material 12 has the same longitudinal and width dimensions as the core material 10 and is laminated on the other surface of the core material 10. The back material 12 and the core material 10 are bonded and fixed by an adhesive. The surface material 11, the core material 10, and the back surface material 12 are laminated | stacked in this order, and the base material 15 is formed by joining.

  The side members 13a and 13b are made of a wood material having a density higher than that of the core material 10, and in the present embodiment, the side members 13a and 13b are realized by medium density fiberboards having a thickness of 1.5 mm to 4 mm. The side members 13a and 13b are selected so that the longitudinal dimension is the same as that of the core material 10, and the width dimension is a value obtained by adding the thickness of the front material 11 and the back material 12 to the thickness of the core material 10. The side members 13a and 13b are joined to the side surfaces of the surface member 11, the core member 10, and the back member 12.

  At this time, one side in the width direction of one surface facing the surface material 11 of the side materials 13a and 13b is joined to the side surface of the surface material 11, and the other side in the width direction of the one surface is connected to the side surface of the back material 12. The remaining portion of the one surface is bonded to the core material 10. The side members 13a and 13b and the surface member 11, the side members 13a and 13b and the core member 10, and the side members 13a and 13b and the back member 12 are bonded and fixed with a polyurethane hot melt adhesive.

  As the polyurethane-based hot melt adhesive, for example, a moisture curable reactive hot melt adhesive (product name: Bond KUM3150 series) manufactured by Konishi Bond Co., Ltd. can be used.

  The side members 13a and 13b include a first virtual plane S1 including a surface opposite to the surface facing the core material 10 of the surface material 11, and a second surface including a surface facing the core material 10 of the side members 13a and 13b. A tapered portion 16 is formed which is inclined toward a boundary line L1 extending along an intersection where the virtual plane S2 intersects, that is, as the thickness approaches the surface material 11.

  The manufacturing procedure of the wood composite material 1 will be described. First, a large-sized core material that becomes the core material 10 after cutting, a large-sized surface material that becomes the surface material 11 after cutting, and a large-sized back material that becomes the back material 12 after cutting are prepared, and the surface material and the back material An adhesive is applied to the surface facing the core material using a roll coater, the surface material, the core material and the back material are laminated in this order, and the surface material and the back material are pressed and bonded to the core material with a press. , To form large format substrates.

  Next, the large-sized base material is cut to a desired width to form the base material 15, and a heated and melted adhesive is applied to each side surface of the base material 15 or the side materials 13 a and 13 b using a roll coater. After the coating, the side materials 13a and 13b are pressure-bonded to each side surface of the base material 15 and bonded. And as shown in FIG. 3, the side part by the side of the surface material 11 of the side materials 13a and 13b is chamfered on the basis of the boundary line L1. In this way, the wood composite material 1 can be obtained.

  For example, when a member having a thickness of 25 mm, a width of 60 mm to 100 mm, and a length of 1800 mm to 2400 mm is manufactured as a house interior material, the surface material 11 and the back material 12 of the wood composite material 1 have a thickness of 2.5 mm to 9 mm. A medium density fiber board is used, and a medium density fiber board having a thickness of 1.5 mm to 4 mm is used for the side members 13a and 13b. Although this thickness depends on the size of the taper portion 16, a thinner one is preferable in terms of cost.

  Since the surface material 11 constituting the surface layer of the wood composite material 1 is required to be homogeneous, the cost is high, whereas the core material 10 can be made of a material that is less expensive than the quality of the surface material 11. . The width dimension, angle, and shape of the tapered portion 16 are not particularly limited. When the width dimension of the taper portion 16 is increased, a medium-density fiber board having a large thickness is required. Moreover, when the width dimension of the taper part 16 is too short, the aesthetics on the design of the wood composite material 1 will fall. The width dimension of the taper part 16 is suitably determined according to the thickness of the wood composite material 1 and the required designability. The cross-sectional shape of the tapered portion 16 is not limited to a linear shape or an arc shape, and may be a polygonal shape.

  According to the present embodiment, the wood composite material 1 is made of a long wood material having a higher density than the core material 10, and the side surface in the width direction perpendicular to the longitudinal direction and the thickness direction of the core material 10 to which the surface material 11 is joined. The side members 13a and 13b have a tapered portion 16 that is formed by chamfering and decreases in thickness toward the boundary line L1 with the surface member 11.

  Thereby, even if the pressing force F1 acts on the side members 13a and 13b due to the expansion of the core material 10 and the surface material 11, the tapered portions 16 of the side members 13a and 13b are easily deformed by the pressing force F1, and the side surfaces The pressing force F <b> 1 acting on the materials 13 a and 13 b can be reduced to prevent a protruding portion from occurring at the corner of the wood composite material 1.

  The side members 13a and 13b may be joined to the side surface of the core material 10 obtained by cutting the large-sized core material. Therefore, after the large-sized core material is cut to a desired width, the side materials 13a and 13b are joined. can do. Thereby, even if it is a case where the woody composite material 1 with a different width dimension is manufactured, a common core material can be used. Therefore, since the dimension in the width direction of the wood composite material 1 is not limited, the wood composite material 1 can be produced efficiently.

  FIG. 4 is a cross-sectional view showing the woody composite material 2 of the second embodiment of the present invention. The wood composite material 2 of the present embodiment is the same as the wood composite material 1 except that the surface material 11, the side materials 13a and 13b, and the back material 12 are partially covered by the decorative sheet 20, and therefore the wood composite Portions common to the material 1 are denoted by the same reference numerals and description thereof is omitted.

  As the decorative sheet 20, for example, a resin film made mainly of an olefin resin such as “101 Series Pure Palette” manufactured by Toppan Printing Co., Ltd. can be used. Can also be used.

  The wood composite material 2 can be formed by covering the surface material 11, the side materials 13 a and 13 b, and the back material 12 of the wood composite material 1 with a decorative sheet 20. The decorative sheet 20 may be fixed to the woody composite material 1 of the first embodiment using, for example, a two-component urethane adhesive.

  According to this embodiment, in the wood composite material 2, a part of the front surface material 11, the side surface materials 13 a and 13 b, and the back surface material 12 is covered with the decorative sheet 20. Thereby, the beauty of the wood composite material 2 can be improved.

  In addition, since the tapered portions 16 are formed on the side members 13a and 13b, even if the pressing force F1 acts on the side members 13a and 13b due to the expansion of the core material 10 and the surface member 11, the side members 13a and 13b The taper portion 16 is easily deformed by the pressing force F1, thereby reducing the pressing force F1 acting on the side members 13a and 13b and preventing the protruding portion from being generated at the corner of the wood composite material 2. it can.

  Therefore, it is possible to prevent a pattern on the line from being formed on the decorative sheet 20 along the boundary line L1 between the side members 13a and 13b and the surface member 11. Therefore, the wood composite material 2 that can maintain the aesthetics of the design over a long period of time can be realized.

  FIG. 5 is a sectional view showing the wood composite material 3 of the third embodiment of the present invention. 5A shows a state before the side members 43a and 43b are joined to the base material 30, and FIG. 5B shows a state where the side members 43a and 43b are joined to the base member 30.

  The core material 40 of the wood composite material 3 has a trapezoidal cross-sectional shape perpendicular to the longitudinal direction. A surface material 41 is bonded to the surface on the long side of the core material 40. A back material 42 is joined to the surface of the short side of the core material 40.

  The surface material 41 is made of a wood material having a higher density than the core material 40, and is realized by a medium density fiber board having a thickness of 2.5 mm to 9 mm in the present embodiment. The surface material 41 has a trapezoidal cross-sectional shape perpendicular to the longitudinal direction. The surface material 41 is selected to have the same length in the longitudinal direction as that of the core material 40, and the length in the width direction is selected to be the same as the width of the long side of the core material 40. The surface material 41 and the core material 40 are bonded and fixed by an adhesive.

  The back surface material 42 is made of a wood material having a higher density than the core material 40, and is realized by a medium density fiber board having a thickness of 2.5 mm to 9 mm in the present embodiment. The back material 42 has a trapezoidal cross-sectional shape perpendicular to the longitudinal direction. The back surface material 42 is selected to have the same length in the longitudinal direction as the core material 40, and the long side size is selected to be the same as the width size of the short side of the core material 40. The side surface of the back material 42 is formed in the same plane as the third virtual one plane S3a, S3b including the side surface of the core material 40.

  The back material 42 and the core material 40 are bonded and fixed by an adhesive. The base material 30 constituted by the surface material 41, the core material 40, and the back surface material 42 includes a large surface material that becomes the surface material 41 after cutting, a large size core material that becomes the core material 40 after cutting, and a back surface material 42 after cutting. Are laminated in this order and joined to form a large base material, and the base material is cut in a desired width direction dimension to form a rectangular base material. It is formed by cutting the side surface of the substrate along third virtual one planes S3a and S3b that form an angle θ with respect to the second virtual one plane S2.

  Side members 43 a and 43 b are joined to the side surfaces of the base material 30. The side members 43 a and 43 b are made of a wood material having a higher density than the core material 40. The side members 43a and 43b are formed in a right triangle in a cross section perpendicular to the longitudinal direction. The hypotenuses of the side members 43a and 43b are referred to as taper portions 46.

  The side members 43a and 43b are formed such that the tapered portion 46 forms an angle θ with respect to the side surface. The angle θ is the same as the angle θ formed by the second virtual one plane S2 and the third virtual one plane S3a, S3b. The angle θ is selected in the range of 5 ° to 45 °, for example. In the present embodiment, the angle θ is selected to be 7 °. The dimensions of the side surfaces of the side members 43a and 43b are selected to be the same as or slightly larger than the thickness dimension of the base material 30. In this embodiment, the thickness dimension of the base material 30 is 25 mm. The side members 43a and 43b are bonded and fixed to the side surfaces of the core member 40, the front member 41, and the back member 42 with an adhesive.

  The manufacturing procedure of the wood composite material 3 will be described. First, an adhesive is applied to the front and back surfaces of a large core material having a square cross-sectional shape, and a large surface material having a square cross-sectional shape and a large back material having a square cross-sectional shape are combined with the surface material, the core material, and the back surface. Laminate in the order of the materials, and bond to the core material to form a large base material having a square cross-sectional shape.

  Next, the large base material is cut at a desired width to form a base material having a quadrangular cross section, and the side surface of the square base material forms an angle θ with respect to the second virtual plane S2. By cutting along the third virtual one plane S3a, S3b, the base material 30 having a trapezoidal cross section is formed.

  Next, a side member 31 having a rectangular cross-sectional shape having a long side dimension equal to or slightly larger than the thickness of the substrate 30 is prepared. Cut by the dimension L4 obtained by (dimension L3 of the long side of the base material 30−dimension L3 of the short side of the base material 30) / 2 shown in FIG. It cuts along and obtains side material 43a, 43b. And after apply | coating an adhesive agent to each side surface of the base material 30, the side materials 43a and 43b are joined to each side surface of the base material 30. As shown in FIG.

  In this way, the wood composite material 3 can be obtained. After that, as shown in FIG. 5B, the side portions of the surface material 41 are chamfered. The wood composite material 3 may be covered with a decorative sheet 20. Thereby, the beauty of the wood composite material 3 can be improved.

  According to this embodiment, since the taper part 46 is formed in the whole area of the surface which opposes the core material 40, the surface material 41, and the back surface material 42 of the side materials 43a and 43b, the core material 40 and the surface material 41 expand | swell, and a side surface Even if the pressing force F1 acts on the materials 43a and 43b, the pressing force F1 can be absorbed by the deformation of the tapered portion 46 and the stress distribution.

  Further, the side members 43a and 43b are formed in a right triangle shape in cross section, and the tapered portion 46 is formed so that the thickness decreases toward the surface side (surface material 41 side) of the wood composite material 3. On the surface material 41 side of the core material 40 where the large pressing force F1 acts, the thickness of the side materials 43a and 43b is reduced, and on the back material 42 side where the small pressing force F1 acts, the thickness of the side materials 43a and 43b is reduced. It is formed to be thick.

  Thereby, the pressing force F1 due to the expansion of the core material 40 can be efficiently absorbed. Accordingly, the pressing force F1 due to the expansion of the core material 40 and the surface material 41 can be surely prevented on the surface side of the wood composite material 3, so that it is ensured that a protruding portion is generated at the corner portion on the surface side of the wood composite material 3. Can be prevented.

  Further, since the side members 43a and 43b may be joined to the side surfaces of the core material 40, the wood material 3 can be obtained by joining the side materials 43a and 43b after cutting the core material 40 with a desired width dimension. . Thereby, even if it is a case where the woody composite material 3 from which a different width dimension is manufactured, the common core material 40 can be used. Therefore, since the dimension of the width direction of the wood composite material 3 is not restricted, the wood composite material 3 can be produced efficiently.

  In still another embodiment of the present invention, a normal plywood or a structural plywood made of a conifer, a broad-leaved tree, or a mixture of both tree species may be used as the cores 10 and 40. In addition, a wood chip board such as a single board laminated material (LVL), particle board or oriented slant board (OSB) is used as the core material 10, 40, and the hard fiber board is used as the surface material 11, 41 of each core material 10, 40. (Hardboard) or wood fiberboard (fiberboard) such as medium density fiberboard (MDF) is laminated and joined, and on its side, hard fiberboard (hardboard) cut to fit the side, or The side members 13a and 13b such as medium density fiberboards 43a and 43b may be joined. Further, the side members 13a, 13b: 43a, 43b may be formed of a natural wood veneer or the like.

  The thickness of the base materials 15 and 30 in the manufacturing process in this case may be set as appropriate according to the thickness of the laminated hard fiberboard (hardboard) or wood fiberboard such as a medium density fiberboard.

  Moreover, the vertical grinding width in the manufacturing process of the wood composite materials 1, 2 and 3 depends on the thickness of the wood fiber board such as the hard fiber board or medium density fiber board used as the side members 13a and 13b: 43a and 43b. Set as appropriate.

  The longitudinal dimension of the core materials 10 and 40 is set according to the length of the surface materials 11 and 41, and the core materials 10 and 40 having a length less than the length of the core materials 10 and 40 can be obtained by appropriate means such as a finger joint, a scarf joint, or a mating. You just need to cascade.

DESCRIPTION OF SYMBOLS 1 Wood composite material 2 of 1st Embodiment 2 Wood composite material 3 of 3rd Embodiment Wood composite material 10 of 3rd Embodiment Core material 11 Surface material 12 Back surface material 13a, 13b Side surface material 15 Base material 16 Taper part 20 Decorative sheet 30 Base material 31 Base material 40 for side material Core material 41 Surface material 42 Back material 43a, 43b Side material

Claims (4)

Made of a long wood material, a cross-sectional shape perpendicular to the longitudinal direction is a square core material,
A surface material composed of a long wood material having a density higher than that of the core material and bonded to at least one surface in the thickness direction of the core material;
It consists of a long woody material having a higher density than the core material, and on at least one side in the width direction of the core material, including a side surface of the core material and a side material bonded to the side surface of the surface material bonded to the core material,
The side material is a tapered portion formed in a region joined to the surface material of the side material, and includes a first virtual flat surface including a surface opposite to a surface facing the core material of the surface material. A wood composite material comprising a taper portion whose thickness decreases toward a boundary line extending along an intersecting portion where the second virtual one plane including a surface facing the core material of the side surface material intersects . Made of a long wood material, a cross-sectional shape perpendicular to the longitudinal direction is a square core material,
A surface material composed of a long wood material having a density higher than that of the core material and bonded to at least one surface in the thickness direction of the core material;
It is composed of a long wood material having a higher density than the core material, and includes a side material joined to at least one side surface in the width direction of the core material,
The said side material is formed in the area | region joined to the core material of the said side material, and has a taper part which thickness decreases as it approaches a surface material, The woody composite material characterized by the above-mentioned . The wood composite material according to claim 1 or 2 , wherein the core material is made of particle board, and the surface material and the side material are medium density fiberboards . The woody composite material according to any one of claims 1 to 3 , wherein the surface material and the side material are covered with a decorative sheet.

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