JP2007313874A - Wood flooring and manufacturing process thereof - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a wood flooring which does not cause a big gap in a joint part between adjoining wood flooring even when used as a floor for floor heating. <P>SOLUTION: A lot of slits 4 are formed in the wood fiberboard 3 penetrating through the wood fiberboard 3 to the surface of wood substrate 1 in a wood flooring 10, in which the wood fiberboard 3 is pasted on the surface side of the wood substrate 1 and a surface decorative material 5 is pasted on the wood fiberboard 3. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a wooden flooring and a method for producing the same.

  A wooden floor material is known in which a surface decorative material such as a veneer, a decorative synthetic resin sheet, or decorative paper is attached to the surface of a wooden substrate. As the woody base material, a Lauan type plywood base material, a kneaded base material in which a single layer of a core layer part is a softwood single plate and a single layer of a front and back layer is a hardwood single plate are used. In such wood-based flooring, the specific gravity of the plywood base material is as small as 0.4 to 0.6, so if you drop an object on the floor surface during floor construction or floor use, In some cases, dents were formed on the surface of the material. Further, when a chair or cabinet with a caster is moved, a dent may occur.

  In order to improve it, a wooden flooring is made by sticking a wooden fiberboard having a relatively high specific gravity (about 0.6 to 1.2) between the wooden base material and the surface decorative material. It has been known. Thereby, the caster resistance and the dent resistance are improved. However, wood fiberboards such as MDF have poor dimensional stability against moisture changes compared to plywood as a base material, and when they are dried, they shrink significantly compared to plywood base materials. As a result, the wooden flooring may be warped.

  Therefore, when this type of wooden flooring is used as a flooring material for heating, a gap that cannot be ignored in terms of aesthetics may occur in the joint portion between adjacent wooden flooring materials. As a wood-based flooring that solves the inconvenience, Patent Document 1 discloses that a medium-sized fiber is formed on the back side of a medium-sized fiberboard having a thickness of about 2 to 3 mm that is laminated between a wooden substrate and a surface decorative material. A wood-based flooring is described in which a large number of grooves about 40 to 50% of the thickness of the board are formed. Patent Document 2 discloses a depth of 0 for cutting a fiber layer on a surface of an MDF having a thickness of about 1.2 mm as a wood fiber board laminated between a wood base material and a surface decorative material. It is described that MDF formed so that a large number of cuts of about 3 mm are orthogonal to the longitudinal direction of the plate material is used.

  By forming such grooves or kerfs in the wood fiber board, it is possible to suppress the expansion and contraction and warping caused by the dimensional change of the wood fiber board from occurring in the wood floor material, and heating the wood floor material. Even when used as a flooring material, it is expected that a large gap can be avoided in the joint portion between adjacent wooden flooring materials.

JP 10-337713 A JP 11-227105 A

  The present inventors have been involved in the production of a wood floor material in which a wood fiber board is laminated between a wood base material and a surface decorative material. In the process, the thickness of the wood fiber board to be laminated is When the thickness becomes thicker, even when a wood fiber board having a cut groove formed in the middle of the thickness is used, it has been experienced that a gap of a size that cannot be ignored is generated in the joint portion between adjacent wooden floor materials. This is particularly remarkable when a wooden flooring is used as a flooring for floor heating. Further, in the manufacturing process, careful work has been required to form a cut groove in the middle of the laminated or laminated wood fiber board in the thickness direction.

  The present invention has been made in view of the circumstances as described above, and it is relatively easy to manufacture a wooden floor material in which a wooden fiberboard is laminated between a wooden substrate and a surface decorative material. Yes, regardless of the thickness of the wood fiberboard, it is possible to reliably suppress warping of the wooden flooring due to the dimensional change of the wood fiberboard. Even if it is a case where it uses as a floor material, it aims at providing the wooden floor material which can prevent that a big clearance gap produces in the joint part of adjacent wooden floor materials, and its manufacturing method.

  A wood floor material according to the present invention is a wood floor material in which a wood fiber board is stuck on the surface side of a wood base material, and a surface decorative material is stuck on the wood fiber board, A large number of slits reaching the surface of the woody base material are formed in the fiberboard.

  In the above-mentioned wood-based flooring, the wood fiber board located between the wood-based base material and the surface decorative material reaches the surface of the wood-based base material (that is, penetrates in the entire thickness direction) by a large number of slits, Divided into a number of independent wood fiber pieces. For this reason, the amount of dimensional change of each wood fiber piece caused by drying etc. is small, and each behaves independently, so even if the gap between the formed slits may become slightly wide, the whole wood fiber board The influence of the behavior on the woody base material side is small. As a result, even if the wood fiberboard is thick, the wood flooring will not be warped, and even when used as flooring for floor heating, joints between adjacent wood floors There is no large gap in the part.

  In manufacturing a wooden floor material, a material in which a wooden fiberboard is attached to the surface side of a wooden base material is prepared by a conventional method. From the wood fiber board side, laser processing, water jet processing, ultrasonic cutter, end mill (router), saw (round saw, etc.), knife blade, Thomson blade, etc., by conventionally known processing means, A large number of slits reaching the surface of the woody substrate are formed. In this case, the processed groove of the slit may reach the inside slightly from the surface of the wooden base material. Therefore, the slit forming operation is very easy. As another processing method, although the number of work steps is increased, a wood fiber piece obtained by cutting a wood fiber board into small pieces may be separately prepared and adhered to a wood base material.

  A wooden flooring according to the present invention is obtained by sticking a conventionally known arbitrary surface decorative material on the wood fiber board in the laminate thus produced. If necessary, a backing material such as a resin sheet or thin paper is attached to the back surface.

  In the wooden flooring according to the present invention, the wooden base material in the conventional wooden flooring can be used as it is as the wooden base material, for example, a normal plywood made of hardwood or conifer, a single core layer portion. A laminated plywood base material in which the board is a softwood veneer and the front and back layer veneers are hardwood veneers can be used. Furthermore, wood board kneading materials such as OSB and PB can be used as the wood base material. The surface decorative material may also be a conventionally known surface decorative material, for example, a veneer made of oak material, birch material, beech material, teak material, etc., preferably about 0.2 to 1.0 mm thick. Examples include synthetic resin sheets, metal sheets, and decorative paper such as thin paper printed with decorative grain.

In the wood floor material according to the present invention, examples of the wood fiber board include MDF and hard fiber board. Preferably, it is MDF or a hard fiber board having a thickness of about 0.3 to 6.0 mm and a density of about 0.6 to 1.2 g / cm ³ . The width of the slit formed in the wood fiber board is preferably larger than 0 mm and not larger than 0.3 mm. When the width of the slit exceeds 0.3 mm, the gap of the slit becomes clearly visible through the surface decorative material, which is not preferable. The cross-sectional shape of the slit is also arbitrary, and may be directly dependent on the processing machine side that processes the slit. Specific examples include U-type, V-type, and I-type.

  There are no particular limitations on the interval and direction of the slits formed in the wood fiber board, and they are appropriately set in consideration of ease of processing. For example, a plurality of slits may be formed at a predetermined interval parallel to the longitudinal direction of the wooden substrate, or a plurality of slits may be formed at a predetermined interval parallel to the short direction of the wooden substrate. You may make it do. You may form a slit parallel to both a longitudinal direction and a transversal direction. In the longitudinal direction, slits may be formed over the entire length of the woody base material, and in the lateral direction, the slits may be formed alternately between the longitudinal slits.

  In the wood-based flooring according to the present invention, a wood fiberboard is stuck on the back side of the wood-based base material, and if necessary, a large number of slits reaching the back side of the wood-based base material also in the wood fiber board. May be formed. The slits formed in the back side wood fiber board may be the same as or different from the slits formed in the front side wood fiber board in the dimensions and formation positions thereof. The slit width may be about 3.0 mm. If necessary, an appropriate backing material is further adhered to the wood fiber board on the back side.

  In the wood-based flooring according to the present invention, slits may be formed in the surface decorative material. In this case, it is particularly preferable from the viewpoint of ease of manufacture that the wood fiber board has a slit formed at least at a position facing the slit formed in the surface decorative material.

  In any of the above-described wood-based flooring materials, at least the surface side of the wood-based base material has a predetermined depth at a position facing all or part of the slits formed in the wood fiberboard adhered thereto. A notch may be formed. When the slit is formed in the wood fiber board, the cut can be easily formed on the surface side of the wooden base material by adjusting the depth of the cut. When sticking a wood fiber board on the back side of the wood base material, on the back side of the wood base material, at a position facing all or part of the slits formed in the pasted wood fiber board. Alternatively, a cut having a predetermined depth may be formed.

  In the experiments by the present inventors, the warp of the wooden flooring due to the dimensional change of the wooden fiberboard can be further suppressed by forming the above-mentioned cut also in the wooden base material. When used as a floor material for floor heating, the gap generated at the joint portion between adjacent wooden floor materials could be further reduced.

  The present invention further provides a method for producing a wooden floor material in which a slit is formed in a wooden fiberboard at a position facing at least the slit formed in the surface decorative material. A step of adhering a wood fiberboard, a step of adhering a surface decorative material on the adhered wood fiberboard, and at least a woody material so as to penetrate both the adhered surface decorative material and the wood fiberboard A method for producing a wooden flooring having at least a step of forming a slit reaching the surface of the base material is also disclosed.

  According to the manufacturing method described above, a wood base material, a wood fiber board, and a surface decorative material are made by laminating and laminating, and from the surface decorative material side, as described above, laser processing, water jet The wooden floor material according to the present invention is slit by a conventionally known processing means such as processing, ultrasonic cutter, end mill (router), saw (round saw, etc.), knife blade, Thomson blade, etc. Since it can be manufactured, the manufacturing process is greatly simplified. Also in this manufacturing method, the above-mentioned cut on the surface of the wood-based substrate can be easily formed by adjusting the depth of cut when the slit is formed in the wood fiber board.

  When slitting from the surface decorative material side, the width of the slit is preferably larger than 0 mm and not larger than 0.3 mm. If the width of the slit exceeds 0.3 mm, the gap of the slit becomes noticeable in the surface decorative material, which is not preferable. When the surface decorative material has a pseudo groove, it is preferable to form a slit along the pseudo groove because the slit becomes inconspicuous. In addition, a so-called slice unit obtained by slicing a flitch obtained by laminating and laminating a plurality of plate base materials formed by laminating a plurality of laminaes in a laminar manner or uniformly is obtained. When using a board as a surface decorative material, it is preferable to form a slit along the boundary line generated between the laminas for the same reason.

  According to the present invention, in a wooden flooring improved in caster resistance and dent resistance by interposing a wooden fiberboard between a wooden base material and a surface decorative material, It is possible to suppress warping of the system flooring. As a result, even when the wooden flooring according to the present invention is used as a flooring material for floor heating, it is possible to reliably prevent a gap having a size that cannot be ignored in terms of aesthetics from occurring in the joint portion between adjacent wooden flooring materials. can do.

  The present invention will be described below with reference to the drawings. 1 and 2 show one embodiment of the wooden flooring according to the present invention, FIG. 3 shows another embodiment of the wooden flooring according to the present invention, and FIGS. 4 and 5 show the wooden flooring according to the present invention. It is a figure which shows another form. FIG. 6 and FIG. 7 are views showing still another form of the wood-based flooring according to the present invention. In this form, cuts are also formed in the wood-based base material.

  In FIG. 1, reference numeral 1 denotes a wood-based base material that is, for example, a Lauan plywood, and a backing material 2 such as paper or nonwoven fabric is attached to the back side. On the surface side of the wooden substrate 1, MDF 3 having a thickness of about 0.3 to 6.0 mm is attached as a wooden fiber board with, for example, a vinyl acetate adhesive. A number of slits 4 having a slit width of preferably about 0.3 mm or less are formed in the MDF 3 so as to reach the surface of the wood base 1 from the surface of the MDF 3.

  In this example, after attaching MDF3 to the surface side of the woody base material 1, a plurality of slits 4a are formed in the vertical direction at intervals of about 50 mm parallel to the long side of the woody base material 1 by a laser processing machine or the like. However, a plurality of slits 4b are formed in the horizontal direction at intervals of about 100 mm in parallel with the short side of the woody base material 1, and the MDF 3 is divided into a large number of MDF pieces 3a.

  The surface decorative material 5 is adhered to the surface of the MDF 3 in which the slits 4a and 4b are formed using an adhesive such as a vinyl acetate adhesive. Thereby, as shown in FIG. 2, the wood type flooring 10 by this invention is formed. In the illustrated example, the surface decorative material 5 is obtained by processing the pseudo groove 6 on the surface of the veneer, but is not limited thereto.

  A wooden flooring 10A shown in FIG. 3 is different from the wooden flooring 10 shown in FIGS. 1 and 2 in that MDF 3 is also attached to the back side of the wooden base 1. A large number of slits 4 a and 4 b that reach the back surface of the woody base material 1 from the back surface are formed in the MDF 3 on the back surface side in the same manner as the MDF 3 on the front surface side. A backing material 2 is attached to the back side of the MDF 3 on the back side. In the illustrated example, the slits 4a and 4b are formed at positions corresponding to the slits 4a and 4b formed on the MDF 3 on the front surface side, but may not correspond to each other. Since the slits 4a and 4b formed in the MDF 3 on the back surface side are not noticeable when laid as a floor material, the slits 4a and 4b may have a wide groove width of about 3.0 mm.

  4 and 5 is different from the wooden flooring 10 shown in FIG. 1 in the procedure for forming the slits 4 in the MDF 3. In the wooden flooring 10B, as shown in FIG. 4, the backing material 2 is attached to the back side of the wooden base material 1 and the MDF 3 is adhered to the front side with an adhesive (the procedure up to this point is shown in FIG. 1). It is the same as the system flooring 10), and the surface decorative material 5 is further adhered thereon. The state is shown in FIG. 4b.

  Next, the slit 4 reaching the surface of the woody base material 1 from the surface side of the stuck surface decorative material 5 so as to penetrate both the surface decorative material 5 and the wood fiber board 3 by, for example, racer processing or the like. Form. Thereby, the wooden flooring 10B shown in FIG. 5 is manufactured. In addition, the slit processing machine can use what was used with the wooden type flooring 10 shown in FIG. 1 as it is. In the example shown in FIGS. 4 and 5, the surface decorative material 5 is obtained by processing the pseudo groove 6 on the surface of the veneer, and the slit 4 is processed along the pseudo groove 6. Yes.

  6 and 7 is different from the wooden flooring 10 shown in FIG. 1 in that cuts 7 are also formed in the wooden base 1. The other structure is the same as that of the wooden flooring 10 shown in FIG. At the time of production, the work of preparing MDF 3 on the surface side of the wood base material 1 and forming many slits 4 in the MDF 3 is the same as the case of the wood floor material 10 shown in FIG. When the slit 4 is formed, the cut depth of the work machine is controlled so that the cut 7 following the slit 4 is also formed on the inner side of the wooden base material 1. The depth of the cut 7 is arbitrary. For example, when the wood base 1 is a 5-ply plywood, the depth is set to the center of the third ply. Further, the cuts 7 may be formed in the wood base material 1 corresponding to all the slits 4 (4a, 4b), and the cuts 7 are formed only in the portions corresponding to some of the slits 4 (4a, 4b). May be.

  After forming the slits 4a and 4b and the cuts 7 in this manner, the surface decorative material 5 is adhered to the surface of the MDF 3. Thereby, as shown in FIG. 7, the wood type flooring 10C by this invention is formed.

  In addition, although not shown in figure, the aspect which forms the notch 7 in the above-mentioned wooden base material 1 is the wooden flooring 10A of the form which stuck MDF3 also to the back surface side of the wooden base material 1 shown in FIG. Can also be applied, and in that case, the cuts 7 are similarly formed on the back surface side of the woody base material 1. The present invention can also be applied to the wooden flooring 10B of the form shown in FIGS. In this case, when the slit 4 is formed so as to penetrate both the surface decorative material 5 and the wood fiber board 3 from the surface side of the attached surface decorative material 5, the cutting depth of the work machine is controlled. Thus, a cut 7 following the slit 4 may be formed on the inner side of the wooden substrate 1. Also in this case, when the surface decorative material 5 having a veneer processed on the surface of the pseudo groove 6 is used, the slit 4 and the cut 7 are processed along the pseudo groove 6.

  Although not shown, the wooden flooring 10, 10C shown in FIG. 1 and FIG. 2 or FIG. 6 and FIG. 7 is manufactured, and the surface side of the surface decorative material 5 is further applied to the wooden flooring 10, 10C. In addition, a slit 4 penetrating both the surface decorative material 5 and the wood fiber board 3 (in the case of a wood floor material 10C, a cut 7 following the slit 4 with respect to the wood substrate 1) may be formed. Moreover, when using the slice single board obtained from a flitch as the surface decoration material 5, you may make it form a slit (and cut 7) along the boundary line which arises between the lamina which comprises a flitch. When using a surface decorative material such as a decorative paper on which a decorative pattern such as a grain is printed, slits can be made inconspicuous by performing slit processing using the pattern.

  In any form of the wooden flooring 10, 10A, 10B, 10C, the MDF 3 is divided into a large number of independent MDF pieces 3a by the slits 4, so that the amount of dimensional change caused in each MDF piece 3a by drying or the like is Small and each behaves independently. Therefore, even if the MDF 3 undergoes a dimensional change due to drying or the like, even if the gap between the slits 4 is slightly widened, the influence of the behavior of the entire MDF 3 on the wood base material 1 side is not affected. small. As a result, even if the MDF 3 is thick, the wooden flooring 10 (10A, 10B, 10C) does not warp, and the wooden flooring 10, 10A, 10B, 10C according to the present invention. Even when used as a floor material for floor heating, a large gap is not generated in the joint portion between adjacent wooden floor materials. In particular, in the wood-based flooring 10C, the cuts 7 are formed also in the wood-based base material 1, so that the gap generated at the joint portion between the adjacent wood-based flooring materials can be further reduced.

[Example 1]
(1) A 945 mm × 1840 mm × 9.0 mm (thickness) lauan plywood was prepared as a wood-based substrate.
(2) MDF with 945 mm × 1840 mm × 2.7 mm (thickness) and specific gravity 0.85 was prepared.
(3) The lauan plywood and MDF were bonded together with a vinyl acetate adhesive. The adhesive was applied to the plywood side in an amount of 16 g / angle, MDF was placed, a pressure of 8 kg / cm ² was applied, and the pressure was pressed for 30 minutes with a cold press.
(4) After curing the laminated substrate obtained in (3) for one day, slit processing was performed on the MDF at a vertical 100 mm pitch and a horizontal 100 mm pitch using a laser processing machine. The laser processing conditions were a processing speed of 2000 mm / min, an output of 60 W, a frequency of 300 Hz, and air as an assist gas. The formed slit penetrated in the thickness direction of the MDF and reached the surface of the Lauan plywood.
(5) Three rows of 1 × 6 scale, 0.3 mm thick oak veneers were attached to the laminated base material after slit processing obtained in (4). The adhesive used was a urea resin + vinyl acetate mixed adhesive, which was applied to the MDF surface at an amount of 8 g / square, placed on a veneer and pressed with a hot press at a pressure of 8 kg / cm ² and 120 ° C. for 1 minute. .
(6) Actual processing was performed around the flooring obtained in (5), and colored wiping coating, undercoating, and transparent topcoating were performed to obtain a wooden flooring.
(7) The wood floor material obtained in (6) was subjected to a scratch resistance test, that is, a DuPont impact test according to JISK5400, and the dent was measured. In addition, the floor heating adaptability test, that is, after immersing in 80 ° C. warm water for 8 hours and then repeating one cycle of natural cooling for 4 hours 100 times, a thermal endurance test for 300 hours of continuous hot water was conducted, and the adjacent wood system The gap between the flooring materials was measured. The results are shown in Table 1.

[Comparative Example 1]
A wooden flooring was produced in the same manner as in Example 1 except that slit processing was not performed on the MDF, and a scratch resistance test and a floor heating adaptability test were performed in the same manner as in Example 1. The results are shown in Table 1.

[Comparative Example 2]
A wooden flooring was produced in the same manner as in Example 1 except that the MDF was not bonded, and the scratch resistance test and the floor heating adaptability test were conducted in the same manner as in Example 1. The results are shown in Table 1.

[Example 2]
(1) A 945 mm × 1840 mm × 6.0 mm (thickness) lauan plywood was prepared as a wood-based substrate.
(2) Two MDFs having 945 mm × 1840 mm × 3.0 mm (thickness) and a specific gravity of 0.85 were prepared.
(3) MDF was bonded to both front and back surfaces of the Lauan plywood with a vinyl acetate adhesive. The adhesive was applied to both sides of the plywood at an amount of 16 g / angle, MDF was placed on each side, a pressure of 8 kg / cm ² was applied, and the pressure was pressed with a cold press for 30 minutes.
(4) After curing the laminated substrate obtained in (3) for 1 day, slit processing was performed on the MDF on both front and back surfaces at a vertical 100 mm pitch and a horizontal 100 mm pitch using a laser processing machine. The laser processing conditions were a processing speed of 2000 mm / min, an output of 60 W, a frequency of 300 Hz, and air as an assist gas. The formed slit penetrated in the thickness direction of the MDF and reached the surface of the Lauan plywood.
(5) Three rows of 1 × 6 scale, 0.3 mm thick oak veneers were attached to the MDF on the surface side of the laminated base material after slit processing obtained in (4). The adhesive used was a urea resin + vinyl acetate mixed adhesive, which was applied to the MDF surface at an amount of 8 g / square, placed on a veneer and pressed with a hot press at a pressure of 8 kg / cm ² and 120 ° C. for 1 minute. .
(6) Actual processing was performed around the flooring obtained in (5), and colored wiping coating, undercoating, and transparent topcoating were performed to obtain a wooden flooring.
(7) The same scratch resistance test and floor heating adaptability test as in Example 1 were performed on the wooden floor material obtained in (6), and the gap between adjacent wooden floor materials was measured. The results are shown in Table 2.

[Comparative Example 3]
A wooden flooring was produced in the same manner as in Example 2 except that the MDF was not slit, and the scratch resistance test and the floor heating adaptability test were conducted in the same manner as in Example 2. The results are shown in Table 2.

[Comparative Example 4]
A wooden flooring was produced in the same manner as in Example 2 except that the MDF was not bonded, and the scratch resistance test and the floor heating adaptability test were performed in the same manner as in Example 2. The results are shown in Table 2.

[Example 3]
(1) A 945 mm × 1840 mm × 9.0 mm (thickness) lauan plywood was prepared as a wood-based substrate.
(2) MDF with 945 mm × 1840 mm × 2.7 mm (thickness) and specific gravity 0.85 was prepared.
(3) The lauan plywood and MDF were bonded together with a vinyl acetate adhesive. The adhesive was applied to the side of the plywood at an amount of 16 g / angle, MDF was placed, a pressure of 8 kg / cm ² was applied, and the pressure was pressed with a cold press for 30 minutes.
(4) After curing the laminated base material obtained in (3) for one day, three rows of 1 × 6 scale, 0.3 mm thick oak veneer were attached. The adhesive used was a urea resin + vinyl acetate mixed adhesive, coated on the MDF surface at an amount of 8 g / square, placed on a veneer, and pressed with a hot press at 120 ° C. under a pressure of 8 kg / cm ² .
(5) Using a processing machine, the laminated body of (4) after sticking the veneer was irradiated with a laser from the veneer surface toward the MDF to perform slit processing. The laser processing was performed using a processing speed of 2000 mm / min, an output of 60 W, a frequency of 300 Hz, and air as an assist gas. The slit penetrated both the veneer and the MDF in the thickness direction and reached the surface of the Lauan plywood. In addition, the place of slit processing was made into the pseudo-groove part formed in the veneer surface when using it as a flooring.
(6) Actual processing was performed around the flooring obtained in (5), and colored wiping coating, undercoating, and transparent topcoating were performed to obtain a wooden flooring.
(7) The same scratch resistance test and floor heating adaptability test as in Example 1 were performed on the wooden floor material obtained in (6), and the gap between adjacent wooden floor materials was measured. The results are shown in Table 3.

[Comparative Example 5]
A wooden flooring was produced in the same manner as in Example 3 except that the MDF was not slit, and the scratch resistance test and the floor heating adaptability test were conducted in the same manner as in Example 2. The results are shown in Table 3.

[Comparative Example 6]
A wooden flooring was produced in the same manner as in Example 3 except that the MDF was not bonded, and the scratch resistance test and the floor heating adaptability test were conducted in the same manner as in Example 2. The results are shown in Table 3.

[Example 4]
(1) A 945 mm × 1840 mm × 9.0 mm (thickness) 5-primer one plywood was prepared as a wood-based substrate.
(2) MDF with 945 mm × 1840 mm × 2.7 mm (thickness) and specific gravity 0.85 was prepared.
(3) The lauan plywood and MDF were bonded together with a vinyl acetate adhesive. The adhesive was applied to the side of the plywood at an amount of 16 g / angle, MDF was placed, a pressure of 8 kg / cm ² was applied, and the pressure was pressed with a cold press for 30 minutes.
(4) After curing the laminated base material obtained in (3) for one day, three rows of 1 × 6 scale, 0.3 mm thick oak veneer were attached. The adhesive used was a urea resin + vinyl acetate mixed adhesive, coated on the MDF surface at an amount of 8 g / square, placed on a veneer, and pressed with a hot press at 120 ° C. under a pressure of 8 kg / cm ² .
(5) Using a laser processing machine, the laminated body of (4) after sticking the veneer was irradiated with a laser from the veneer surface toward the MDF to perform slit processing. The laser processing was performed using a processing speed of 2000 mm / min, an output of 400 W, a frequency of 300 Hz, and air as an assist gas. The slit penetrated both the veneer and the MDF in the thickness direction, and further reached the intermediate layer (the middle of the third ply) of the 5-primer one plywood. In addition, the place of slit processing was made into the pseudo-groove part formed in the veneer surface when using it as a flooring.
(6) Actual processing was performed around the flooring obtained in (5), and colored wiping coating, undercoating, and transparent topcoating were performed to obtain a wooden flooring.
(7) The same scratch resistance test and floor heating adaptability test as in Example 1 were performed on the wooden floor material obtained in (6), and the gap between adjacent wooden floor materials was measured. The results are shown in Table 4.

[Comparative Example 7]
A wooden flooring was produced in the same manner as in Example 4 except that the MDF was not slit, and the scratch resistance test and the floor heating adaptability test were conducted in the same manner as in Example 1. The results are shown in Table 4.

[Comparative Example 8]
A wooden flooring was produced in the same manner as in Example 4 except that the MDF was not bonded, and a scratch resistance test and a floor heating adaptability test were conducted in the same manner as in Example 1. The results are shown in Table 4.

[Discussion]
As shown in Tables 1 to 4, the wood-based flooring materials according to the present invention (Examples 1, 2, 3, and 4) are those of Comparative Examples 2, 4, 6, and 8 (between the base material and the surface decorative material). The amount of dents with respect to the same impact is smaller and the scratch resistance is improved. However, in Examples 1, 2, and 3, compared with Comparative Examples 2, 4 and 6 with high dimensional stability, the gap formed is larger and the floor heating adaptability is somewhat inferior. However, this is an improvement over those in which no slit is formed in the MDF (Comparative Examples 1, 3, and 5). This demonstrates the superiority of the wood-based flooring according to the present invention. Furthermore, in Example 4, the clearance gap is smaller than the thing which does not interpose MDF (Comparative Example 8) between a base material and a surface decoration material, and it turns out that it has high floor heating adaptability. This is presumed to be the result of forming cuts in the woody base material.

The perspective view which decomposes | disassembles and shows one form of the wooden type flooring by this invention. The perspective view which shows one form of the wooden type flooring by this invention. The perspective view which decomposes | disassembles and shows the other form of the wood type flooring by this invention. FIG. 4A is an exploded perspective view showing a state of a wood-based flooring according to the present invention before slit processing of another embodiment, and FIG. 4B shows a state before lamination after lamination. The perspective view which shows the state after the slit process of the wood type floor material state shown in FIG. The perspective view which decomposes | disassembles and shows the other form of the wooden type flooring by this invention. The perspective view of the wood type flooring shown in FIG.

Explanation of symbols

  10, 10A, 10B, 10C ... wood flooring, 1 ... wood base material (Lawan plywood), 2 ... lining material, 3 ... wood fiber board (MDF), 3a ... wood fiber board (MDF) piece, 4 ( 4a, 4b) ... slit, 5 ... surface decorative material, 6 ... pseudo groove, 7 ... notch

Claims (6)

  A wooden flooring material in which a wooden fiberboard is attached to the surface side of a wooden base material, and a surface decorative material is attached to the wooden fiberboard, and the wooden fiberboard has a wooden base material. A wooden flooring, characterized in that a large number of slits reaching the surface are formed.   A wooden flooring, characterized in that a wooden fiberboard is attached to the back side of the wooden base material, and a number of slits reaching the back side of the wooden base material are formed in the wooden fiberboard.   3. The wooden flooring material according to claim 1 or 2, wherein a slit is also formed in the surface decorative material.   The wood-based flooring material according to claim 3, wherein a slit is formed in the wood fiber board at a position facing at least the slit formed in the surface decorative material.   A cut having a predetermined depth is formed on at least the surface side of the wood base material at a position facing all or a part of the slits formed in the wood fiber board adhered thereto. Item 5. A wooden flooring material according to any one of Items 1 to 4. The process of sticking a wood fiber board on the surface side of a wooden base material The process of sticking a surface cosmetic material on the stuck wood fiber board, and
Forming a slit that reaches at least the surface of the wood-based substrate so as to penetrate both the adhered surface decorative material and the wood fiber board;
And at least a method for producing a wooden floor material.

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