JP2007196517A - Manufacturing method of building material - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a manufacturing method of a building material which enables the manufacture of the building material excellent in workability. <P>SOLUTION: The building material 1 is roughly divided into a step for preparing plywood 2 and a middle density fiber board 3, a step for preparing a substrate 5 by stacking and bonding the plywood 2 and the middle density fiber board 3, and a step for stacking and bonding the substrate 5 and decorative laminate 6. In a preparation stage of the middle density fiber board 3, after the middle density fiber board 3 is dried in a dry room, the middle density fiber board is taken out from the dry room in a sealed package state and naturally cooled. When the middle density fiber board 3 dried so that the surface moisture content becomes 2% or less thereby is bonded for joint with the plywood 2, the moisture is shifted from the plywood 2 side to the middle density fiber board 3 side, and the substrate 5 turns curved toward the middle density fiber side 3. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a method for manufacturing a building material in which a decorative plate such as a single plate is bonded to a substrate in which a medium density fiberboard (MDF) is laminated on a plywood.

  Conventionally, a building material in which a medium-density fiberboard is laminated on a plywood is used as a substrate, and a decorative board is bonded to the substrate. When creating a building material having such a configuration, the substrate may protrude toward the plywood side, and may have a concave shape (convex shape toward the plywood side) on the medium density fiberboard side. Thus, there is a problem that the building material created using the concave substrate on the medium density fiberboard side has poor workability.

Therefore, in order to solve such a problem, in the prior art, as disclosed in Patent Document 1 below, the surface moisture content of the plywood is adjusted to about 10% before the plywood and the medium density fiberboard are laminated. At the same time, there is provided a measure for making the medium density fiberboard completely dry. Thus, when a plywood with an adjusted surface moisture content and a medium density fiberboard are laminated and bonded together, the plywood protrudes toward the medium density fiberboard based on the principle described in detail in Patent Document 2 below. A building material that tends to be in a (slope) state can be provided with relatively excellent workability.
JP-A-10-151603 JP-A-6-108626

  Here, when employ | adopting the manufacturing method of the above-mentioned prior art building material, you have to adjust so that the surface moisture content of a medium density fiber board may become lower than a plywood. In addition, if the difference in surface moisture content between the medium density fiberboard and the plywood is not large to some extent, the amount of protrusion (warpage) protruding toward the medium density fiberboard in the substrate formed by laminating and pasting both is small. Therefore, if a decorative board is laminated on this substrate to form a final building material, there is a high possibility that it will have a convex shape on the plywood side. Therefore, when building materials are produced as described above, it is necessary to make the surface moisture content of the medium density fiberboard as low as possible before producing the substrate. However, in the prior art, it is difficult to significantly reduce the surface moisture content of the medium density fiberboard relative to the plywood, and there is a problem that it is not possible to provide a building material with excellent workability.

  Moreover, since many building materials are used in a normal construction site, it is desirable that the warping of building materials is substantially uniform regardless of lots. However, as described above, in the conventional technology, the surface moisture content of the medium density fiberboard could not be adjusted with high accuracy, so the warpage may be slightly different for each lot of building materials. There is a problem that there is a high possibility that defective products unsuitable for construction or unsuitable for construction will occur.

  Furthermore, when building materials are produced by a conventional manufacturing method, the medium density fiberboard absorbs moisture while the medium density fiberboard is dried and then cooled to room temperature. At this time, if a manufacturing method such as the prior art is employed, moisture may not be uniformly distributed over the entire medium density fiberboard in some cases. In such a case, the surface moisture content is different for each portion of the medium density fiberboard, and there is a problem in that warpage may occur in a single building material.

  Therefore, in view of such a problem, in the present invention, a building material that can produce a building material excellent in workability even if created by bonding a decorative plate such as a single plate to a substrate in which a medium density fiberboard is laminated on a plywood. The purpose is to provide a manufacturing method.

  The invention according to claim 1, which is provided to solve the above-described problem, is a method for manufacturing a building material obtained by laminating a medium density fiber board and a decorative board on a plywood. The medium density fiberboard taken out from the drying chamber is covered with a resin sheet and hermetically packaged, and the temperature is lowered to room temperature, and the hermetic packaging is released and laminated and bonded to the plywood. Is the method.

  In the building material manufacturing method of the present invention, after the medium density fiberboard is placed in a high temperature drying chamber and dried, the medium density fiberboard absorbs moisture while the medium density fiberboard is lowered to room temperature. In order to prevent this, the medium density fiberboard taken out from the drying chamber is covered with a resin sheet and hermetically packaged, and then the hermetic packaging is released and laminated and bonded to the plywood. Therefore, according to the manufacturing method of the building material of this invention, the surface moisture content of the medium density fiber board at the time of lamination | stacking adhesion | attachment of a medium density fiber board and a plywood can be adjusted with a sufficient precision. Therefore, according to the method for manufacturing a building material of the present invention, it is possible to manufacture a building material having a substantially uniform warpage and excellent workability regardless of lots and parts.

  Further, according to the method for manufacturing a building material of the present invention, water absorption during the period until the temperature of the medium density fiberboard dried in the drying chamber is lowered to room temperature can be prevented, so that the surface moisture content of the medium density fiberboard is reduced to plywood. Can be significantly reduced. Therefore, according to this invention, in the state which laminated | stacked the medium density fiber board and the plywood, the curvature of this can be made into the state suitable for construction of construction material.

  Here, as described above, the present inventors have found that water absorption after drying of the medium density fiberboard can be prevented, and the surface moisture content of the medium density fiberboard can be extremely reduced. Therefore, the present inventors provide a building material with excellent workability by adjusting the surface moisture content of the medium density fiberboard and the plywood when the surface moisture content of the medium density fiberboard is lowered. I studied earnestly about what I can do.

  The invention according to claim 2 provided on the basis of the above-described research results of the present inventors is a method for manufacturing a building material in which a medium density fiber board and a decorative board are laminated on a plywood. The surface moisture content is adjusted to 0 to 2%, and the medium density fiberboard is adhered and laminated to a plywood having a surface moisture content of 6% or more by an adhesive, and then the decorative board is adhered and laminated by an adhesive. It is a manufacturing method of building materials.

  According to the method for manufacturing a building material of the present invention, a building material having excellent workability can be provided.

  In the invention according to claim 3, the medium-density fiberboard is placed in a high-temperature drying chamber, the medium-density fiberboard taken out from the drying chamber is hermetically packed, the temperature is lowered to room temperature, and the hermetic packaging is released. 3. The building material manufacturing method according to claim 2, wherein the laminated material is laminated and bonded to the plywood.

  In the method for manufacturing a building material according to the present invention, after the medium density fiberboard is dried in the drying chamber, the temperature is lowered to room temperature in a hermetically packed state. Therefore, according to the method for manufacturing a building material of the present invention, it is possible to prepare a medium density fiberboard having a substantially uniform surface moisture content and an extremely low surface moisture content regardless of the lot or part.

  According to the manufacturing method of building materials of the present invention, the surface moisture content of the medium density fiberboard can be adjusted to be extremely low, so the difference in surface moisture content between the two when the medium density fiberboard and plywood are bonded and laminated. It can be taken big. Therefore, if a medium density fiberboard is prepared as in the present invention, the medium density fiberboard and the plywood can be laminated (bonded) on the medium density fiberboard side by bonding and laminating, Building materials with excellent workability can be manufactured.

  In the building material manufacturing method of the present invention, after the medium-density fiberboard is dried, the temperature is lowered to room temperature in a hermetically sealed state, so that the water absorption rate of the medium-density fiberboard is substantially uniform regardless of the lot or part. be able to. Therefore, according to the present invention, it is possible to produce a building material having a substantially uniform warpage and excellent workability regardless of lots and parts.

  Here, in the method for manufacturing a building material according to claim 1 or 3, the hermetic packaging may be performed by covering the medium density fiberboard with a resin sheet (claim 4).

  ADVANTAGE OF THE INVENTION According to this invention, it can prevent reliably that a medium density fiber board absorbs water, while reducing the temperature of the medium density fiber board dried in the drying chamber to normal temperature.

  Moreover, in the manufacturing method of the building material in any one of the said Claim 1 thru | or 4, it is desirable to adjust the atmospheric temperature in a drying chamber to 90 to 120 degreeC (Claim 5).

  According to such a configuration, the surface moisture content of the medium density fiberboard can be sufficiently reduced, and a building material excellent in workability can be provided.

  Furthermore, in the manufacturing method of the building material according to any one of claims 1 to 5, it is desirable that the surface moisture content of the medium density fiberboard when laminated and bonded to the plywood is less than 1.5%. 6).

  If the medium density fiberboard and the plywood are bonded and laminated in a state where the surface moisture content of the medium density fiberboard is sufficiently reduced as in the present invention, a building material having excellent workability can be provided.

  Moreover, the manufacturing method of the building material in any one of the said Claims 1 thru | or 6 WHEREIN: The said medium density fiber is provided in the surface at the side of the medium density fiber board of the board | substrate comprised by carrying out lamination | stacking adhesion of the medium density fiber board to the plywood. A decorative board having a surface moisture content higher than that of the board may be laminated and bonded (Claim 7).

  When the surface moisture content of the decorative board laminated and bonded to the substrate as in the present invention is higher than the surface moisture content of the medium density fiber board, moisture moves from the decorative board side to the medium density fiber board side, and the medium density The degree of warping to the fiberboard side is moderated to some extent. Therefore, according to the method for manufacturing a building material of the present invention, the degree of warpage toward the medium density fiberboard can be made more appropriate for construction.

  ADVANTAGE OF THE INVENTION According to this invention, the manufacturing method of the building material which can manufacture the building material excellent in workability can be provided.

  Then, the manufacturing method of the building material concerning one Embodiment of this invention is demonstrated in detail, referring drawings. In FIG. 1, 1 is a building material of this embodiment. As shown in the drawing, the building material 1 is produced by laminating and bonding a plywood 2 and a medium-density fiberboard 3 to form a substrate 5, and further laminating and adhering a decorative board 6 thereto. As shown in FIG. 2, the manufacturing method of the building material 1 of the present embodiment is a process of preparing the plywood 2 and the medium density fiber board 3 (step 1-1), and the plywood 2 and the medium density fiber board 3 are laminated. It is roughly divided into a process of creating the substrate 5 by bonding (step 1-2) and a process of laminating and bonding the decorative plate 6 to the substrate 5 (step 1-3).

  The plywood 2 is a single plate obtained by laminating thin single plates (not shown) with an adhesive so that the fiber directions thereof are orthogonal to each other, as in the conventional one. In the present embodiment, a plywood 2 having a surface moisture content of 6% or more is prepared for producing the substrate 5.

  As the medium density fiberboard 3 (Medium Density Fiberboard, MDF), a material obtained by forming a fiber by pulverizing wood like a conventionally known one is used. Here, the medium density fiberboard 3 has a surface moisture content of about 3 to 4% in a normal storage state, although it varies depending on storage conditions and the like. In the building material manufacturing method of the present embodiment, the medium density fiberboard 3 is not used as it is for the production of the substrate 5, but the surface moisture content in the preparation stage of the medium density fiberboard 3 shown in Step 1-1 of FIG. It is used for the production of the substrate 5 after adjusting the rate.

  The adjustment of the surface moisture content of the medium density fiberboard 3 is performed by the procedure as shown in FIG. More specifically, when adjusting the surface moisture content of the medium density fiberboard 3, first, in step 2-1, the ambient temperature is 100 ° C. or higher (100 ° C. to 105 ° C. in this embodiment) as shown in FIG. Yes, the humidity is very low (near 0%) and is placed in a dry room for about 7 days.

  When the medium density fiber board 3 is dried in the drying chamber as described above, the medium density fiber board 3 is covered with the resin sheet and hermetically packed as shown in Step 2-2 of FIG. As the resin sheet used here, for example, a material having no water permeability or very low water permeability, such as polyethylene, polypropylene, polystyrene, polyvinyl chloride, polyvinylidene chloride and the like is used. Moreover, since the medium density fiberboard 3 dried in the drying chamber is heated to a high temperature in the drying chamber, it has sufficient heat resistance at a temperature of the drying chamber atmosphere temperature (100 ° C. to 105 ° C.). It is desirable to be. As shown in Step 2-3 of FIG. 3, the medium-density fiberboard 3 is left to cool to room temperature (40 ° C. or lower) by taking it out of the drying chamber in the state of being hermetically packed as described above. The Thereby, the medium density fiber board 3 will be in the state by which the surface moisture content was adjusted to 2% or less.

  When the surface moisture content of the medium density fiberboard 3 is adjusted to 2% or less as described above, the plywood 2 and the medium density fiberboard 3 are laminated and bonded as shown in FIG. The board | substrate 5 is produced by integrating (refer step 1-2 of FIG. 2). More specifically, a medium density fiberboard 3 is laminated on one side of the plywood 2 prepared in Step 1-1, and a water-based adhesive suitable for bonding wood, such as an aqueous vinyl urethane system, between them. The agent is applied. In the present embodiment, 100 pairs of laminated plywood 2 and medium density fiberboard 3 are stacked, and this is 30 at a pressure of 5 kg / cm2 to 15 kg / cm2 in a temperature atmosphere of 0 ° C to 40 ° C. Pressed for min-60 min. Thereby, the plywood 2 and the medium density fiber board 3 are laminated and bonded and bonded, and the substrate 5 is formed.

  Here, as described above, the surface moisture content of the plywood 2 prepared in Step 1-1 is about 6%, whereas the surface moisture content of the medium density fiberboard 3 is adjusted to 2% or less. . In other words, the surface moisture content of the medium density fiberboard 3 is sufficiently lower than the surface moisture content of the plywood 2, and the difference is 4% or more. Therefore, when the medium density fiber board 3 is laminated | stacked with respect to the plywood 2 as shown to Fig.4 (a) and both are adhere | attached, the water | moisture content contained in the plywood 2 moves to the medium density fiber board 3 side. Thereby, the medium density fiberboard 3 having a low surface moisture content absorbs moisture and extends, and the plywood 2 having a high surface moisture content releases moisture and contracts. Thereby, as shown in FIG.4 (b), the board | substrate 5 will be in the state which curved as a whole so that the surface by the side of the medium density fiber board 3 might become a mountain curvature.

  When the plywood 2 and the medium density fiber board 3 are laminated and bonded as described above to form the substrate 5, as shown in FIG. 4 (c), a makeup is applied to the surface of the substrate 5 on the medium density fiber board 3 side. The board 6 is laminated and bonded to form the building material 1. Here, the decorative board 6 used in the present embodiment has a surface moisture content higher than that of the medium density fiberboard 3 described above. Therefore, when an adhesive such as aqueous vinyl urethane is applied between the surface of the substrate 5 on the medium density fiber board 3 side and the decorative board 6 and pressed, the moisture contained in the decorative board 6 is medium density fiber board. Move to side 3. Thereby, the medium density fiberboard 3 having a low surface moisture content absorbs moisture and extends to some extent, and the decorative board 6 having a high surface moisture content releases moisture and contracts to some extent. Thereby, as shown in FIG.4 (d), the building material 1 will be in a convex state in the medium density fiberboard 3 side as a whole (a concave state in the plywood 2 side), or a substantially flat state.

  In the manufacturing method of the building material 1 of this invention, in the preparation stage (step 1-1) of the plywood 2 for the board | substrate 5, or the medium density fiber board 3, the medium density fiber board 3 is arrange | positioned and dried in a high temperature drying chamber. After that, the medium density fiber board 3 is covered with a resin sheet and hermetically packaged to prevent the medium density fiber board 3 from absorbing moisture during cooling. Therefore, according to the manufacturing method of the building material 1 described above, the surface moisture content of the medium density fiberboard 3 can be adjusted substantially uniformly regardless of the lot or the part.

  Moreover, in the manufacturing method of the said embodiment, since the medium density fiber board 3 which reduced the surface moisture content to 2% or less is used when carrying out a lamination | stacking adhesion | attachment with the plywood 2, the board | substrate 5 is made into the medium density fiber board 3 side. It can be in a convex state. Therefore, according to the manufacturing method of the said embodiment, the curvature of the building material 1 and the board | substrate 5 can be made into a state convenient on construction.

  As in the manufacturing method of the present embodiment, a decorative board 6 having a surface moisture content higher than that of the medium density fiber board 3 is laminated and bonded to the substrate 5 that is convex toward the medium density fiber board 3 side and pressed. Thereby, the building material 1 can be made into a substantially flat state. Therefore, according to the manufacturing method of this embodiment, the building material 1 excellent in workability can be manufactured.

  In the above embodiment, the surface moisture content of the medium density fiber board 3 when laminated and bonded to the plywood 5 is adjusted to 2% or less, but in order to make the substrate 5 warped to the medium density fiber board 3 side. Is more preferably adjusted to less than 1.5%.

  As described above, in the manufacturing method of the present embodiment, when the medium density fiber board 3 is taken out of the drying chamber and allowed to cool in the preparation stage of the medium density fiber board 3, the medium density fiber board 3 is covered with a resin sheet. The structure is hermetically sealed. Therefore, according to the manufacturing method described above, moisture absorption while the medium density fiberboard 3 dried in the drying chamber is allowed to cool can be reliably prevented.

  In the said embodiment, when taking out the medium density fiber board 3 when taking out the medium density fiber board 3 from a drying chamber with a resin sheet, the example was enclosed, but this invention is not limited to this, For example, of water | moisture content It is good also as a structure which is left to cool to normal temperature in the state which accommodated the medium density fiber board 3 in the box etc. which were created with the material with little permeability. When the medium density fiberboard 3 is hermetically packaged with a resin sheet, the medium density fiberboard 3 may be packaged one by one or plural sheets. Moreover, it is good also as a structure which makes the resin sheet into a bag shape, accommodates the medium density fiber board 3 in this, and is sealed. That is, the medium density fiber board 3 may be hermetically packaged by any method as long as it can prevent moisture absorption when the medium density fiber board 3 is allowed to cool.

  In the said embodiment, although the structure which adjusts the atmospheric temperature in a drying chamber to about 100 degreeC-105 degreeC and dried the medium density fiber board 3 was illustrated, this invention is not limited to this, 90 degreeC- You may adjust suitably within the range of about 120 degreeC. According to such a configuration, the medium density fiber board 3 can be sufficiently dried in an optimal state according to conditions such as the material of the medium density fiber board 3 and the drying speed.

  Moreover, in the said embodiment, although the medium density fiber board 3 was arranged and dried for 7 days in the drying stage of the humidity of about 0% in the preparation stage of the medium density fiber board 3, it illustrated the method of drying shown here. The conditions such as the indoor humidity and the drying period are merely examples, and can be adjusted as appropriate.

  In the above embodiment, no special treatment was applied to the plywood 2 in the preparation stage of the plywood 2. However, the present invention is not limited to this. It is good also as a structure which improves a rate. According to such a configuration, the difference in surface moisture content between the plywood 2 and the medium density fiber board 3 at the time of producing the substrate 5 becomes more remarkable, and the substrate 5 is further warped toward the medium density fiber board 3 side. it can. By adopting such a method, the warpage of the substrate 5 can be adjusted over a wider range, and the warpage of the substrate 5 can be adjusted to a state suitable for the production of the building material 1.

  Similarly, the manufacturing method of the above embodiment did not particularly adjust the surface moisture content of the decorative board 6, but the present invention is not limited to this, and the surface moisture content of the decorative board 6 is appropriately adjusted. It is good also as a structure to adjust. According to this structure, the curvature of the building material 1 can be adjusted much more accurately.

Moreover, although the adhesive used at the time of creation of the building material 1 can select suitably the optimal thing for adhere | attaching the plywood 2, the medium density fiber board 3, and the decorative board 6, in the manufacturing method shown to this embodiment, It is desirable to use a water-based adhesive because it involves the movement of moisture between the plywood 2 and the medium density fiber board 3 or between the medium density fiber board 3 and the decorative board 6.
[Example]
Next, examples of the present invention will be described. Table 1 shows the warpage in the width direction (short direction) and the longitudinal direction of the substrate 5 and the building material 1 created using the substrate 5 when the surface moisture content of the plywood 2 and the medium density fiberboard 3 is variously changed. It is the test result investigated.

  In this example, as shown in Table 1, four types (samples A to D) of samples having different surface moisture contents of the plywood 2 and the medium density fiberboard 3 at the time of producing the substrate 5 were produced. More specifically, the sample A has a plywood 2 having a high surface moisture content adjusted so that the surface moisture content is in the range of 8 to 10%, and the surface moisture content is 2% or less as shown in the above embodiment. The medium density fiberboard 3 having a low surface moisture content and adjusted to 1 is used. Sample A corresponds to that shown as an example of the modification in the above embodiment. Sample B was prepared using a plywood 2 having a high surface moisture content in the range of 6 to 8% on the surface and a medium density fiberboard 3 having a surface moisture content of 2% or less and a low surface moisture content. It is a thing. The sample B corresponds to the building material 1 and the substrate 5 created by the manufacturing method shown in the above embodiment.

  Sample C is a plywood 2 having a high surface moisture content adjusted so that the surface moisture content is in the range of 8 to 10%, and a medium density fiber board 3 having a surface moisture content of 3 to 4% and a high surface moisture content. It was created using. Sample D includes a plywood 2 having a high surface moisture content adjusted to have a surface moisture content in the range of 6 to 8%, and a medium density fiberboard 3 having a surface moisture content of 3 to 4% and a high surface moisture content. It was created using.

  Samples A to D created in this example all had a width W (length in the short direction) of 300 mm and a length L (length in the longitudinal direction) of 1800 mm. Further, the thickness of the plywood 2 constituting the samples A to D was 5 mm, the thickness of the medium density fiber board 3 was 3 mm, and the thickness of the decorative board 6 was 2 mm.

  In the present embodiment, for each of the samples A to D, the state of the building material 1 in which the decorative board 6 is laminated and bonded to the surface of the substrate 5 on the medium density fiberboard 3 side, as well as the width warpage and longitudinal warpage in the state of the board 5. The width warpage and the longitudinal warpage were investigated. The results are shown in Table 1.

  Here, the “width warp” refers to a warp when the building material 1 or the substrate 5 is observed from the end on one end side in the longitudinal direction (an arrow height when observed in the arrow X direction in FIG. 1). Further, the “longitudinal warp” refers to a warp when the building material 1 or the substrate 5 is observed from the end on one end side in the short side direction (arrow height when observed in the arrow Y direction in FIG. 1). In Table 1, when the values of the width warp and the longitudinal warp are positive, it indicates that the building material 1 and the substrate 5 are convex on the medium density fiberboard 3 side (concave shape on the plywood 2 side), and the width When the value of the warp or the longitudinal warp is negative, it indicates that the building material 1 or the substrate 5 has a concave shape on the medium density fiberboard 3 side (a convex shape on the plywood 2 side). The test results shown in Table 1 are average values of the width warpage and the longitudinal warpage when 15 samples A to D are prepared.

  As shown in Table 1, the samples A and B in which the surface moisture content of the medium density fiber board 3 is adjusted to 2% or less are the surface of the medium density fiber board 3 in both the width warpage and the longitudinal warpage in the state of the substrate 5. Warpage to the medium density fiberboard 3 side was larger than samples C and D having a moisture content of 3 to 4%. Moreover, the sample A and B in the state of the building material 1 were smaller than the samples C and D whose surface moisture content of the medium density fiber board 3 is 3 to 4% in the width curvature to the plywood 2 side.

  Moreover, when the longitudinal warpage in the state of the building material 1 is compared between samples (sample A and sample C, sample B and sample D) having the same moisture content of the plywood 2, the longitudinal warpage of the samples A and B is Each was smaller than the longitudinal warpage of Samples C and D. Therefore, by adjusting the surface moisture content of the medium density fiberboard 3 to 2% or less as in Samples A and B, warpage (width warpage, longitudinal warpage) toward the plywood 2 in the state of the building material 1 that is the final product. It was found that the warpage to the plywood 2 side can be minimized by adjusting the surface moisture content of the medium density fiberboard 3 to 2% or less.

  Moreover, as shown in Table 1, the difference in the moisture content of the plywood 2 and the building material 1 between samples (sample A and sample B, sample C and sample D) having the same surface moisture content of the medium density fiberboard 3 When the width warpage and the longitudinal warpage in the state of the substrate 5 are compared, the samples A and C having a higher surface moisture content of the plywood 2 are medium density fiberboards 3 than the samples B and D having a lower surface moisture content of the plywood 2. It turned out that it tends to become a convex shape on the side (concave shape on the plywood 2 side). Accordingly, by increasing the difference in surface moisture content between the plywood 2 and the medium density fiber board 3, both the width warpage and the longitudinal warpage are convex on the medium density fiber board 3 side (concave shape on the plywood 2 side). It was found that the building material 1 having excellent workability can be provided.

  Subsequently, Table 2 shows the results of examining the variation in the width warp of the building material 1 when a large number of the above-described samples B and D are prepared. In Table 2, the width warpage is classified into 0.50 mm or more, 0 mm or more and less than 0.50 mm, and 0 mm or less. About the test result of the sample B, 600 building materials 1 and the board | substrate 5 were investigated. Moreover, about the sample D, 23564 sheets of building materials 1 and the board | substrate 5 were investigated.

  As shown in Table 2, for the sample B in which the surface moisture content of the medium density fiberboard 3 is suppressed to 2% or less, most of the samples having a width warpage of 0.50 mm or more occupy 0 mm or more and less than 0.50 mm. There was very little for some. Moreover, about the sample B, there was no thing whose width curvature is 0 mm or less, and all were convex shape in the medium density fiber board 3 side (concave shape in the plywood 2 side).

  On the other hand, the sample D in which the surface moisture content of the plywood 2 is substantially the same as that of the sample B and the surface moisture content of the medium density fiberboard 3 is higher (3 to 4%) than the sample B has a width warpage of 0.50 mm. There were almost the same as above and those of 0 mm or more and less than 0.50 mm. Sample D had a width warpage of 0 mm or less, that is, a concave shape on the medium density fiberboard 3 side (a convex shape on the plywood 2 side), and 3.8% of the undesirable in terms of construction occurred. Thereby, it turned out that sample B has a higher tendency to be convex on the medium density fiberboard 3 side than on sample D (concave shape on plywood 2 side).

  Here, the building material 1 having a width warpage of 0.50 mm or more can be preferably applied, and a part of the width warpage having a width warpage of 0 mm or more and less than 0.50 mm can be used for construction. Moreover, it is assumed that the thing whose width curvature is 0 mm or less is unsuitable for construction. Therefore, it turned out that the building material 1 which can be constructed suitably can be produced by suppressing the surface moisture content of the medium density fiber board 3 at the time of production of the board | substrate 5 like the sample B to 2% or less.

(A) is a perspective view which shows the building material created with the manufacturing method concerning one Embodiment of this invention, (b) is a disassembled perspective view of the building material shown to (a). It is a flowchart which shows the manufacturing process of the building material concerning one Embodiment of this invention. It is a flowchart which shows the process concerning the preparation of a medium density fiber board. (A)-(d) is a conceptual diagram which shows typically the state of the plywood, the medium density fiberboard, and the decorative board in each step of the manufacturing process of the building material concerning one Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Building material 2 Plywood 3 Medium density fiber board 5 Substrate 6 Decorative board

Claims (7)

  In a method for producing a building material in which a medium density fiberboard and a decorative board are laminated on a plywood, the medium density fiberboard is placed in a high temperature drying chamber, and the medium density fiberboard taken out from the drying chamber is covered with a resin sheet. A method for producing a building material, wherein the temperature is lowered to room temperature in a hermetically packaged state, the hermetic package is unwrapped and laminated and bonded to a plywood.   In the manufacturing method of the building material formed by laminating the medium density fiberboard and the decorative board on the plywood, the surface moisture content of the medium density fiberboard is adjusted to 0 to 2%, and the surface moisture content of the medium density fiberboard is 6% or more. A method of manufacturing a building material, comprising: laminating and laminating a laminated board with an adhesive and then laminating a decorative board with an adhesive.   The medium density fiberboard is placed in a high temperature drying chamber, and the medium density fiberboard taken out from the drying chamber is hermetically packaged and the temperature is lowered to room temperature, and the hermetic packaging is unwrapped and laminated and bonded to the plywood. The manufacturing method of the building material of Claim 2 to do.   Sealing packing is performed by covering a medium density fiber board with a resin sheet, The manufacturing method of the building material of Claim 1 or 3 characterized by the above-mentioned.   The method for producing a building material according to any one of claims 1 to 4, wherein the atmospheric temperature in the drying chamber is 90 ° C to 120 ° C.   The method for producing a building material according to any one of claims 1 to 5, wherein the surface moisture content of the medium density fiberboard when laminated and bonded to the plywood is less than 1.5%.   A laminated board having a surface moisture content higher than that of the medium density fiber board is laminated and adhered to a surface of the medium density fiber board side of the substrate constituted by laminating and bonding the medium density fiber board to the plywood. The manufacturing method of the building material in any one of 1 thru | or 6.

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