JP2011226103A - Method of manufacturing wood floor material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method of manufacturing a wood floor material with excellent dimensional stability, especially suitable for floor heating by preventing deformation such as contraction and concave warpage caused by moisture vaporization.SOLUTION: A method of manufacturing a wood floor material comprises a first double-surface heat pressure step where a surface sliced veneer 3 is bonded onto a wood base material 1, an upper surface of which has been coated with an upper face adhesive 2 using an upper heating plate 5 under heating/pressure condition, and simultaneously a lower side of the wood base material 1 is subjected to a heat pressure using a lower heating plate 6, and a second double-surface heat pressure step where vertical inversion is conducted upon completion of the first double-surface heat pressure step to set the rear surface of the wood base material 1 as the upper side, a rear face adhesive 21 is coated to the rear surface to bond a rear surface sliced veneer 4, and the vertical inversion is conducted again to bond the rear surface sliced veneer 4 using the lower heating plate 6 under a heating/pressure condition, and simultaneously the upper side of the wood base material 1 is subjected to the heat pressure using the upper heating plate 5.

Description

  The present invention relates to a flooring material, and more particularly to a method for producing a wooden flooring material in which a veneer (single plate) is adhered to the front and back surfaces of a wooden base material.

  In recent years, in the residential field, wooden floor materials are easy to clean, etc., and have the advantage of suppressing the occurrence of ticks that are a cause of sick house syndrome. Its use is expanding.

  However, with the depletion of timber resources worldwide, it has become difficult to obtain solid timber, and the price has been rising, so various things such as plywood, laminated wood, medium density fiberboard (MDF), particle board, etc. A wood composite material in which a surface decorative material is attached to a wood base material and is subjected to a flooring finish is in widespread use.

  As the wood composite material, a wood composite material in which a synthetic resin sheet printed with natural wood grain, such as zelkova, or a strong paper is pasted on the surface of the plywood or the like is often used as a flooring material. . On the other hand, in the living room and the like, the number of houses adopting the floor heating method is increasing, and the development of floor materials corresponding to floor heating is progressing as a wooden floor material used therefor.

  Usually, the floor heating is generally performed by heating from the lower surface of the floor by a heating method such as an electric heating method. At this time, moisture contained in the wooden flooring is evaporated and contracted by heating, and the size of the flooring is reduced. The problem of deformation arises. Moreover, the problem that the flooring warps in a concave shape also occurs.

  Therefore, in order to prevent the above-described shrinkage and warpage, conventionally, the floor material is adhered to the front and back surfaces of the wooden base material with the same surface material to balance shrinkage and expansion, thereby preventing problems such as warpage. Has been done. As a method of manufacturing a flooring material in which the same surface material is adhered to the front and back surfaces, for example, first, a surface material such as a cover plate is adhered to the front surface side by a method such as hot pressing, and then also to the back surface side. In general, a method is used in which a back surface material is attached to which a veneer of the same quality is attached, and then manufactured in three steps including a drying step in which the wood substrate is dried in a heating furnace or the like.

  However, in the above method, after the surface material is adhered, the cooling curing for cooling is required twice, and it takes a cooling time until the material cools after the drying process, and the manufacturing process takes a long time. is there. In addition, since the drying process is performed as described above, a drying apparatus such as a heating furnace is required, and an extra equipment investment must be made, resulting in a problem of high manufacturing costs.

  On the other hand, Japanese Patent Application Laid-Open No. 2003-27731 discloses a flooring material that improves the dent resistance and caster resistance of a flooring material using a medium-quality fiber board and suppresses dimensional changes and does not warp. . That is, the flooring is formed by laminating middle-quality fiberboards having the same thickness on both the upper and lower surfaces of the plywood, and the surface decorative veneer and the back veneer on the upper surface of the upper medium-fiberboard and the lower surface of the lower medium-fiberboard, respectively And the thickness of the plywood is 40% or more of the thickness of the flooring.

  And as the effect, because the middle thickness fiberboard of the same thickness is laminated on both the upper and lower surfaces of the plywood, not only the dent resistance and caster resistance of the flooring is improved by the middle quality fiberboard, but also the upper side of the plywood There is also described an effect that the first layer and the lower layer have the same layer structure and no warpage occurs.

  However, in the flooring described in the above prior art, medium-sized fiberboards having the same thickness are laminated on both upper and lower surfaces of the plywood, and the surface decorative veneer is respectively formed on the upper surface of the upper medium-fiber board and the lower surface of the lower medium-fiber board. And the back single plate are laminated, the structure is complicated, and therefore there are many manufacturing processes, and it cannot be said that it can be manufactured advantageously in terms of cost.

JP 2003-27731 A

  The present invention has been made in view of the above-described background art, and its purpose is to prevent problems such as shrinkage and concave warping caused by evaporation of moisture contained in the flooring, and is particularly suitable for floor heating. Another object of the present invention is to provide a method for producing a wooden floor material having excellent dimensional stability.

  In order to solve the above-mentioned problem, a method for manufacturing a wooden flooring according to the first aspect of the present invention comprises: applying a surface adhesive to a surface of a wooden base material; The first veneer hot-pressing step of heating and pressing the surface veneer under pressure and simultaneously pressing the lower side of the wood base with the lower hot plate, and the first double-side hot-pressing step is turned upside down. With the back side of the wood base as the top, after applying the back side adhesive to this back side and sticking the back side veneer, flip it upside down again and heat the back side veneer with the lower heat plate, sticking under pressure And a second double-sided hot-pressing step in which the upper side of the wood substrate 1 is hot-pressed with the upper hot plate at the same time.

  As the veneer to be attached to the front and back surfaces, use rotary lace or the like from natural wood, such as softwood such as pine, cedar, cypress, and hemlock, or hardwood logs such as oak, hippopotamus and beech In addition, a single plate having a thickness of 0.2 to 0.6 mm sliced thinly like wig peeling is preferably used.

  Examples of the wood base material include various base materials such as plywood, laminated wood, medium density fiber board (MDF), particle board, and wood plastic board (WPB). Among them, the plywood is preferably used because it has excellent strength, is easily available, and has good workability.

  Examples of adhesives that heat and apply the veneer to a wood substrate under pressure include SBR adhesives, vinyl acetate adhesives, ethylene-vinyl acetate adhesives, melamine adhesives, and urea resin adhesives. An adhesive such as an adhesive is used, and a known emulsion adhesive that can be applied with a roll coater or a spreader is preferably used.

  Here, as the adhesive applied to the back surface of the wooden substrate in the second double-sided hot pressing step, after the back veneer is pasted, it is turned upside down again so that the back veneer does not peel off due to its own weight when reversed. In addition, an adhesive having excellent initial tackiness is used. For example, an SBR adhesive, an ethylene-vinyl acetate adhesive, a melamine adhesive, or the like having an adhesive viscosity of 100 to 300 poise during use is preferably used.

  In the flooring according to the first aspect of the present invention, in the first double-sided hot-pressing step, the surface veneer is heated on the surface of the wooden substrate with the upper hot plate and stuck under pressure, and at the same time with the lower hot plate. Since the lower side of the wooden substrate is heated to dry the back side of the wooden substrate, the sticking of the front veneer and the drying step can be performed in one step.

  Moreover, after finishing the first double-sided hot pressing process, the back side of the wood base is turned upside down, the back side veneer is adhered to the back side with a back surface adhesive, and then turned upside down again and backed by the lower side hot plate. In order to perform the second double-sided hot-pressing process in which the veneer is heated and bonded under pressure, and at the same time the top side of the wooden substrate is dried with the upper hot plate, the process of attaching and drying the back veneer in one step. It can be carried out.

  For this reason, the woody substrate is forcibly dried with a hot plate on both the front side and the back side. Therefore, 2 wooden flooring materials that have pasted veneer on both the front and back sides of the wood base material that has been conventionally performed in 3 steps, usually the front veneer sticking step, the back veneer sticking step, and the drying step. It can be manufactured in a process. As a result, it is not necessary to provide a separate drying device, and the time required for manufacturing the wooden flooring can be shortened, and a wooden flooring excellent in dimensional stability can be manufactured efficiently and at low cost. .

It is explanatory drawing which shows typically the manufacturing method of the wooden flooring concerning 1st Embodiment of this invention, (a) shows the state which apply | coated the surface adhesive to the front side of the wooden base material, (b) is the 1st. 1 shows a double-sided hot-pressing process, (c) shows a state where a back surface adhesive is applied to the back surface of the wooden base material which has become the upper side by the first reversal, and (d) shows a back surface adhesive agent on the back surface of the wooden base material. The back surface veneer is placed and adhered, and (e) shows the second double-sided hot pressing process.

  Hereinafter, an embodiment of a method for producing a wooden floor according to the present invention will be described in detail with reference to the drawings. Drawing 1 is an explanatory view showing typically the form which enforces the above-mentioned manufacturing method, when a thick plywood is used as a woody base material.

  As shown in FIG. 1A, first, a known surface adhesive 2 is applied to the front side of the wooden substrate 1 by an adhesive application device (not shown) such as a roll coater. Here, as the surface adhesive 2, an SBR adhesive, a vinyl acetate adhesive, an ethylene-vinyl acetate adhesive, a melamine adhesive, a urea resin adhesive, and the like can be used. It is appropriately selected depending on the type and thickness of the veneer 3 bonded to the front side of the material 1.

  FIG.1 (b) is explanatory drawing which shows a 1st double-sided hot-pressing process, and as shown in figure, the surface veneer 3 is mounted on the surface of the wooden base material 1 via the surface adhesive 2, and an upper side hotplate is shown. The surface veneer 3 is heated and adhered under pressure in the direction indicated by the downward arrow using 5, and at the same time, the lower side of the wooden substrate 1 is heated by the lower hot plate 6 in the direction indicated by the upward arrow. At this time, the upper hot plate 5 and the lower hot plate 6 keep the temperature at 70 to 150 ° C., the pressure at 0.5 to 1.5 MPa, and hold the above hot pressure condition for 30 to 90 seconds to perform double-side hot pressing. .

  By heating and pressurizing both front and back surfaces of the wooden base material 1 as described above, the surface veneer 3 can be adhered to the surface of the wooden base material 1, and the back surface of the wooden base material 1 can be heated to thereby apply the wooden base material. It is possible to dissipate moisture on the back side of 1 and dry the back side at the same time.

  After the end of the first double-sided hot-pressing process, a first reversal is performed to flip the wood substrate 1 upside down. In the first reversal, the front and back surfaces of the wooden substrate 1 are reversed as shown in the figure, and the back veneer 4 is attached to the back surface that is the upper side. That is, as shown in FIG. 1 (c), the back surface adhesive 21 is applied to the back surface of the wooden base material 1 that is now on the upper side by the first inversion, and the back surface veneer as shown in FIG. 1 (d). 4 is mounted, and the back veneer 4 is adhered to the back surface of the wooden substrate 1.

  The wooden base material 1 having the back surface veneer 4 adhered to the back surface is again turned upside down and subjected to the second inversion. At this time, as the back surface adhesive 21, a material having a large initial tack force that can be adhered without being peeled off by its own weight even when the wooden base material 1 is turned upside down and the back surface veneer 4 is positioned on the lower side is used. .

  As the back surface adhesive 21, for example, an SBR adhesive, an ethylene-vinyl acetate adhesive, a melamine adhesive, or the like having a high initial tack force with an adhesive viscosity of 100 to 300 poise at the time of use is preferable. Used.

  After finishing the second reversal, a second double-sided hot pressing process is performed. That is, as shown in FIG. 1 (e), the back veneer 4 adhered to the back surface of the wooden substrate 1 is pressed and heated in the direction indicated by the upward arrow by the lower heat plate 6, and the back surface adhesive 21. Are firmly adhered to each other and simultaneously pressed and heated by the upper hot plate 5 in the direction indicated by the downward arrow.

  At this time, as in the first double-sided hot pressing step, the upper hot plate 5 and the lower hot plate 6 keep the temperature at 70 to 150 ° C., the pressure at 0.5 to 1.5 MPa, and the hot pressure condition for 30 to 90 seconds. Hold and hold both sides. Thus, by heating and pressurizing both front and back surfaces of the wooden substrate 1, the back veneer 4 can be adhered to the back surface of the wooden substrate 1, and the surface side moisture is heated by heating the surface. Can be diffused, and the surface side of the wooden substrate 1 can be simultaneously dried.

  The code | symbol 7 shows the wooden flooring which concerns on this invention, and while the surface veneer 3 is stuck on the surface of the wooden base material 1 as shown in figure, the back veneer 4 is stuck on the back surface. . Thus, the surface veneer 3 and the back veneer 4 adhered to the front and back surfaces of the wooden substrate 1 are the same, and the balance between shrinkage and expansion on the front surface side and the back surface side makes it possible to generate heat. It is possible to provide a wooden flooring 7 that is not particularly warped, deflected, or dimensional change, and that is particularly suitable for floor heating.

  It should be noted that the surface veneer 3 is made of a synthetic resin paint such as amino alkyd resin, vinyl resin, acrylic resin, epoxy resin, polyurethane resin, unsaturated polyester resin, isocyanate or the like alone or arbitrarily modified. Using the synthetic resin paint, it is possible to paint it clear, if necessary, so that it is lightly colored and makes use of the grain.

  In addition, a UV-curable paint such as acrylic resin paint, amino alkyd resin paint, urethane resin paint is applied on the clear coating film, and a clear or semi-clear protective film is formed by irradiating with UV light. can do. With this protective film, the wood flooring 7 having excellent impact resistance can be obtained.

  Moreover, although embodiment mentioned above described the example which used the plywood as the wooden base material 1, it is not restricted to a plywood, You may use wooden boards, such as a particle board and a medium density fiber board (MDF). Thus, the manufacturing method of the wooden flooring according to the present invention can be changed in design, and belongs to the technical scope of the present invention unless departing from the scope of the claims.

DESCRIPTION OF SYMBOLS 1 Wood base material 2 Surface adhesive 21 Back surface adhesive 3 Front surface veneer 4 Back surface veneer 5 Upper side hot plate 6 Lower side hot plate 7 Wood floor material which concerns on this invention

Claims (1)

  After applying the surface adhesive to the surface of the wooden substrate, heat the surface veneer on the wooden substrate with the upper hot plate and paste it under pressure, and at the same time lower the above wooden substrate with the lower hot plate The first double-sided hot-pressing step for hot-pressing, and after finishing the first double-sided hot-pressing step, the back side of the wooden substrate was turned upside down and the back side adhesive was applied to the back side to adhere the back veneer. Thereafter, the wood flooring includes a second double-sided hot-pressing step in which the backside veneer is heated upside down with the lower side hot plate and is stuck under pressure, and the upper side of the wood base is hot-pressed with the upper side hot plate. Manufacturing method.

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