JP2010076240A - Method for manufacturing wood composite board - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enable bonding of a wood molding material and a wood in a short time by obtaining a sufficient calorific value, to upgrade the productivity of a wood composite board. <P>SOLUTION: An adhesive 6 is applied to one adhesive surface 4a of the wood molding material 4 or the wood 1, then an aqueous electrolyte solution 3 is applied to the other adhesive surface 1a, and the lapped adhesive surfaces 4a and 1a are pressurized. Further, the lapped adhesive surfaces are subjected to high-frequency electric heating, to bond the wood molding material and the wood together. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention manufactures a wood composite material in which a wood molding material such as a molding material formed from a wood raw material is bonded to wood such as a wood veneer or wood plywood to produce a wood composite material such as a plate material or a bar material. Regarding the method.

  In consideration of the problem of depletion of forest resources, wood composite materials combined with wood are provided in order to stably supply wood materials as building materials, furniture materials, etc. while protecting and nurturing them. As this wood composite material, for example, a material obtained by bonding wood such as a wood veneer or wood plywood and various wood molding materials formed from wood raw materials is known.

  In manufacturing such a wood composite material, an adhesive is applied, the adhesive surfaces are overlapped, and heated and pressed by a hot press or the like to bond the wood and the wood molding material. Attempts have also been made to oscillate high frequency simultaneously with heating and pressurization, increase the amount of heat by high frequency heating, and increase the adhesion efficiency while suppressing burning of wood.

  The wooden molding material is widely known as a laminated material such as a particle board molded using a wooden chip or an MDF molded using a wooden fiber. As one method for producing such a wooden molding material, Patent Document 1 discloses that a heat-crosslinking aqueous acrylic resin is mixed as a molding adhesive with a wooden molding raw material such as a wooden chip or a wooden fiber, and then hot pressing. A method is described in which heating plate heating and high-frequency induction heating are used in combination during molding.

  According to the above manufacturing method, it is possible to form a board having a thickness of up to 40 mm and shorten the molding time.

Further, in Patent Document 1, most of the high-frequency energy during high-frequency heating is absorbed in the water portion of the thermally crosslinkable aqueous acrylic resin, the temperature rises rapidly, and the crosslinking reaction proceeds accordingly. It is described that if a small amount of electrolyte is present in the water portion, the heat generation rate is accelerated and effective.
JP 2004-230736 A

  However, the manufacturing method described in Patent Document 1 is a method for manufacturing a wooden molding material that is composited with wood, and in the composite with wood, the presence of an electrolyte in the water portion of the aqueous adhesive is a wooden molding material. It is not possible to predict how effective it will be in bonding wood to wood. It is also understood that a minute amount of electrolyte is indispensable.

  However, even if a saturated amount of sodium chloride is added to the water-based adhesive, generally 50% of the coating amount is water in the water-based adhesive, so that the adhesion efficiency between the wooden molding material and the wood is improved by high-frequency heating. A sufficient calorific value is not obtained. From this, it is confirmed that addition of a small amount of electrolyte is not effective for adhesion between the wood molding material and wood. On the other hand, if the amount of water-based adhesive applied is increased, it is expected that a greater calorific value will be obtained, but increasing the amount of water-based adhesive reflects the cost of the wood composite material and is not adopted. I want.

  The present invention has been made in view of the circumstances as described above, and provides a method for producing a wood composite material that can obtain a sufficient calorific value to enable adhesion in a short time and improve productivity. It is an issue.

  The present invention has the following features in order to solve the above problems.

  1st invention manufactures the wood composite material which apply | coats an adhesive agent to the adhesion surface of a wood molding material and wood, overlap | superposes the adhesion surfaces, pressurizes and heats at high frequency, and adheres the wood molding material and wood The method is characterized in that an adhesive is applied to one of the adhesion surfaces of the wood molding material or wood and an aqueous electrolyte solution is applied to the other adhesion surface.

  The second invention is characterized in that, in the feature of the first invention, the electrolyte aqueous solution is a saline solution.

  According to the first aspect of the present invention, the adhesive is applied to either the wood molding material or the wood, and the aqueous electrolyte solution is applied to the other surface, so that a sufficient amount of electrolyte is supplied to the adhesive surface. The amount of heat generated at the time of high-frequency heating can be made sufficient. As a result, the wood molding material and the wood can be bonded in a short time compared to the conventional case, and the productivity of the wood composite material is improved.

  According to the second invention, in addition to the effect of the first invention, since the aqueous electrolyte solution is a saline solution, the aqueous electrolyte solution can be easily prepared, and can be easily produced as a saturated aqueous solution. Further, the manufacturing cost can be kept sufficiently low. Moreover, adverse effects such as corrosion on the wood molding material and wood are small, and it becomes possible to manufacture the wood composite material having the required performance.

  FIG. 1 is a process diagram showing an embodiment of a method for producing a wood composite material of the present invention.

  In the method for manufacturing a wood composite shown in FIG. 1, an aqueous electrolyte solution 3 is applied by a roll coater 2 to an adhesive surface 1a of a wood 1 such as a wood plywood obtained by laminating and laminating wood single plates and wood thin plates vertically and horizontally. . The roll coater 2 includes a coating roll 2a and a transporting roll 2b arranged to face the coating roll 2a, and the electrolyte aqueous solution 3 is supplied to the outer peripheral surface of the coating roll 2a. The wood 1 is fed between the application roll 2a and the transport roll 2b in the roll coater 2. The surface opposite to the adhesive surface 1a is supported by the transport roll 2b, the adhesive surface 1a is continuously in contact with the outer peripheral surface of the coating roll 2a, and the aqueous electrolyte solution 3 is uniformly applied over the entire adhesive surface 1a. The

  The aqueous electrolyte solution 3 is an aqueous solution containing an electrolyte as a solute, and salt or the like can be used as the electrolyte. The aqueous electrolyte solution 3 is preferably one that does not alter or corrode the wood 1. The salt solution has a small adverse effect on the wood 1 and is suitable for manufacturing a wood composite material having a required performance. Further, the saline solution is versatile as the aqueous electrolyte solution 3 and can be easily prepared as a saturated aqueous solution. Further, the manufacturing cost can be kept sufficiently low.

  In addition, although the board | plate material is illustrated for the timber 1, it is not restricted to a board | plate material, Rods, such as a square, may be sufficient.

  Further, in the method for manufacturing a wood composite material shown in FIG. 1, an adhesive 6 is applied by a roll coater 5 to an adhesive surface 4a of a wood molding material 4 known as a laminated material such as MDF or particle board. Although the board | plate material is illustrated for the wooden molding material 4 corresponding to the timber 1, it is not restricted to a board | plate material similarly to the timber 1, and rods, such as a square, may be sufficient. The combination of the wood 1 and the wood molding material 4 is arbitrary.

  Similar to the roll coater 2, the roll coater 5 includes an application roll 5a and a transport roll 5b arranged to face the application roll 5a, and the adhesive 6 is supplied to the outer peripheral surface of the application roll 5a. The wooden molding material 4 is fed between the coating roll 5a and the transport roll 5b in the roll coater 5. The surface opposite to the adhesive surface 4a is supported by the transport roll 5b, the adhesive surface 4a is continuously in contact with the outer peripheral surface of the coating roll 5a, and the adhesive 6 is uniformly applied to the entire area of the adhesive surface 4a. The

  Various types of adhesives including conventionally known ones can be used. Those commonly used for general woodworking such as vinyl acetate resin can be used, and an aqueous adhesive or the like is preferably used because of easy handling.

  In the method for manufacturing the wood composite material shown in FIG. 1, the aqueous electrolyte solution 3 is applied to the adhesive surface 1a of the wood 1 and the adhesive 6 is applied to the adhesive surface 4a of the wood molding material 4. The manufacturing method of the composite material includes an aspect in which the adhesive 6 is applied to the adhesive surface 1 a of the wood 1 and the electrolyte aqueous solution 3 is applied to the adhesive surface 4 a of the wood molding material 4.

  In addition, the aqueous electrolyte solution 3 and the adhesive 6 are applied by the roll coaters 2 and 5, but various types of application methods can be adopted. It is also possible to adopt spray coating that allows more uniform application.

  Next, in the method for manufacturing the wood composite material shown in FIG. 1, the wood 1 coated with the electrolyte aqueous solution 3 and the wood molding material 4 coated with the adhesive 6 are overlapped with each other on the adhesive surfaces 1a, 4a, In the press molding apparatus 7, both the wood 1 and the wood molding material 4 are heated and pressed to bond them together. The hot press molding apparatus 7 can oscillate high frequency, and in addition to direct heating by a heat transfer board or the like, the wood 1 and the wooden molding material 4 are induction heated by high frequency.

  The superposition of the wood 1 and the wood molding material 4 can be performed even when the electrolyte aqueous solution 3 is in a wet state or in a semi-dry state. The superposition can be performed even when the adhesive 6 is in a wet state or in a semi-cured state. In the presence of moisture, the wood 1 and the wooden molding material 4 are superposed and bonded.

  The hot press molding apparatus 7 may be one that does not include high-frequency oscillation means. In this case, a high-frequency oscillation device may be provided so that the high-frequency oscillation device oscillates a high frequency in accordance with heating and pressurization by the hot press molding device 7 and performs high-frequency induction heating.

  After a predetermined time elapses, the wood 1 and the wood molding material 4 are bonded to produce a wood composite material. Thereafter, the wood composite material is finished into a final product through processes such as cutting, sticking of a decorative material such as a veneer, groove and actual processing, coloring and painting.

  As described above, in the method for manufacturing the wood composite material shown in FIG. 1, a sufficient amount of electrolyte can be supplied by applying the electrolyte aqueous solution 3 to the bonding surface 1a of the wood 1, and heat generation during high-frequency heating can be achieved. The amount can be sufficient. As a result, the wood molding material 4 and the wood 1 can be bonded in a short time compared to the conventional case, and the productivity of the wood composite material is improved.

  Hereinafter, the Example of the manufacturing method of the woody composite material of this invention is shown.

  An MDF with a thickness of 2.7 mm was used as the wood molding material, and a wood plywood with a thickness of 9 mm was used as the wood, and both were bonded and combined to produce a base material for the flooring.

A 20% strength saline solution was applied to the adhesive surface of the wood plywood at 100 g / m ² with a roll coater. An adhesive for woodworking was applied to the bonding surface of the MDF with a roll coater. The bonding surfaces of the MDF and the wood plywood were superposed and heated and pressurized while being oscillated at high frequency in a hot press molding apparatus.

  The MDF and the wood plywood were bonded to obtain a composite wood composite material. Bonding in a short time was realized, and the MDF and the woody plywood were bonded well.

By supplying the concentration of 20% salt water at 100 g / m ^2, the adhesion surface between the MDF and wood plywood, simply compared with the case of applying the adhesive, the water content is increased ^2%, 10g / m 2 Of salt could be supplied. Good adhesion in a short time is considered to be due to an increase in the supply amount of sodium chloride as an electrolyte.

  In Example 1, MDF and LVL flash core material were bonded and compounded under the same conditions except that the LVL flash core material having a thickness of 10 to 40 mm was used instead of wood plywood. Saturated saline (normal temperature) was applied to the adhesive surface of the LVL flash core material.

  As in Example 1, the MDF and the LVL flash core material were bonded to each other after heating and pressurizing with high frequency oscillation in a hot press molding apparatus, and a composite wood composite material was obtained.

  As in Example 1, the bonding in a short time was realized, and the MDF and the LVL flash core material were bonded well.

It is process drawing which showed one Embodiment of the manufacturing method of the woody composite material of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Wood 1a Adhesive surface 3 Electrolyte aqueous solution 4 Wood molding material 4a Adhesive surface 6 Adhesive

Claims (2)

  In the manufacturing method of a wood composite material in which an adhesive is applied to an adhesive surface between a wood molding material and wood, the adhesive surfaces are overlapped with each other, pressurized and heated at high frequency, and the wood molding material and wood are bonded together. Alternatively, a method for producing a wood composite material, wherein an adhesive is applied to any one adhesive surface of wood and an aqueous electrolyte solution is applied to the other adhesive surface.   The method for producing a wood composite material according to claim 1, wherein the electrolyte aqueous solution is a saline solution.

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