JP2007007959A - Method and apparatus for impregnating woody material with resin - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method and apparatus which can obtain a woody material impregnated with a resin more efficiently and more uniformly as compared with a conventional woody material. <P>SOLUTION: The apparatus is equipped with at least a transfer means 11 transferring a woody material 1 to be treated, a vacuum suction means arranged to make its suction port 20 be contacted with the outer surface of the woody material 11 to be transferred, and means (12a, 12b, and 13) supplying the resin R to form a sealing layer by a resin liquid layer for impregnation on the outer surface of a suction port vicinity area in the woody material to be transferred while being contacted with the suction port of the vacuum suction means. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a resin impregnation method and a resin impregnation apparatus for a wood material, and more particularly to a method and an apparatus for impregnating a wood material with a resin in order to impart dimensional stability, strength, heat resistance and the like to the wood material. .

  It is known to impregnate a woody material with a resin for the purpose as described above. For example, when the resin is a thermosetting resin, the wood material impregnated with the resin is subjected to a resin curing treatment such as a heat treatment, and the impregnated resin is cured to improve the physical properties of the wood material. When impregnating a wood material with resin, there are methods such as application impregnation by brush, roll, etc., or immersion impregnation in which the wood material is immersed in the resin liquid to be impregnated, but the type of wood material and the type of resin to be impregnated In some cases, it may not be sufficiently impregnated. As a method for uniformly impregnating a necessary and sufficient amount of resin, a vacuum impregnation method using a vacuum kettle is known, but it has a large size and shape larger than the wood material to be processed, and a large airtightness that can withstand a high degree of vacuum. In addition to requiring a simple apparatus, the impregnation treatment is a batch type, resulting in high production costs and poor efficiency.

In order to efficiently perform resin impregnation treatment on a wood material, a method and an apparatus for performing the impregnation treatment while transferring the wood material have been proposed. Patent Document 1 describes a method and an apparatus for performing a deaeration process for removing the internal air of a wooden material under reduced pressure and performing an impregnation process (depressurization impregnation) with a thermosetting resin immediately after the deaeration process is completed. Patent Document 2 describes a method in which a thermosetting resin is sprayed from the upper surface side of a medium density fiber board (MDF) and simultaneously sucked from the lower surface side with a negative pressure of about 50 to 760 mmHg in vacuum. ing.
JP 2004-330738 A Japanese Patent Laid-Open No. 10-323809

  The device described in Patent Document 1 can perform deaeration and resin impregnation in a series of steps while moving the wood material, and can simplify the apparatus as compared with the reduced pressure impregnation method using a vacuum kettle. Also, productivity is improved. However, deaeration and resin impregnation are performed in separate steps, and it is inevitable that air enters the wood material again in the process of moving from the deaeration step to the impregnation step. Moreover, although the resin impregnation is improved by the reduced pressure impregnation, it is necessary to prepare a reduced pressure chamber provided with a spray for resin impregnation separately from the deaeration chamber, and the apparatus becomes complicated.

  The method described in Patent Document 2 is such that a suction from the lower surface side and a spraying of the thermosetting resin from the upper surface side are simultaneously performed, and it can be said that it is a preferable method in terms of processing steps. However, this method is basically a method in which the resin sprayed on the upper surface side is sucked from the lower surface side, and the resin is infiltrated into the wooden material, obtaining a uniform impregnation, and a high resin impregnation rate. It is not easy to secure.

  The present invention has been made in view of the circumstances as described above. A resin impregnation method and a resin impregnation apparatus capable of obtaining a wood material impregnated with resin more efficiently and more uniformly than conventional ones. The purpose is to provide.

  In the resin impregnation method for the wood material according to the present invention, a resin liquid layer is formed on a part of the outer surface of the wood material to be transferred so that a sealing layer is formed by the resin to be impregnated, and the wood material is in that state. It is characterized in that degassing from the interior of the wood material and resin impregnation into the interior of the wood material proceed simultaneously by negatively sucking the air inside the wood material from the vicinity of the resin liquid layer while transferring the material.

  In the above method, the internal air of the wooden material to be transferred is sucked by the negative pressure, and at the same time, the resin forming the resin liquid layer can immediately enter the portion where the air has existed. Deaeration and resin impregnation are performed substantially simultaneously. Therefore, the resin impregnation time is shortened and uniform impregnation proceeds.

  In the method of the present invention, a sealing layer made of resin to be impregnated is formed on one or both of the upper and lower surfaces of the wooden material to be transferred, and negative pressure suction of internal air is performed from one of the upper or lower surfaces of the wooden material to be transferred. Further, a sealing layer made of resin impregnated on both side surfaces (the end surface) of the wood material to be transferred may be formed.

  By appropriately adjusting the area of the outer surface of the wood material on which the resin liquid layer is formed and the location where the negative pressure is sucked in the internal air, and adjusting the strength of the negative pressure suction and the feed rate of the wood material The same wood material can be impregnated with resin on the entire surface layer portion and the inner layer portion, or only the surface layer portion can be impregnated with resin. Furthermore, it is possible to impregnate the resin not only on the entire surface layer portion but on only a part thereof, for example, on the upper surface side surface layer portion or the lower surface side surface layer portion.

  In addition, including the invention of the device described later, in the present invention, the “outer surface of the wooden material” is used as a term including all outer surfaces of the wooden material to be transferred. Includes all of the upper surface, the lower surface, both end surfaces and both side surfaces of the wood material.

  The present invention also provides, as an apparatus for carrying out the above-described method, negative pressure suction that is arranged such that a suction means is in contact with a transfer means for transferring a wood material and a part of the outer surface of the wood material to be transferred. The resin is supplied so that a sealed layer is formed by the resin liquid layer to be impregnated on the outer surface area in the vicinity of the suction port in the wood material transferred in contact with the suction port of the suction means and the negative pressure suction unit An apparatus for impregnating a wooden material with a resin, characterized by comprising at least a resin supply means, is also disclosed.

  In the above apparatus, the suction port of the negative pressure suction means may be disposed so as to be in contact with either the upper surface or the lower surface of the wooden material to be transferred, and depending on the size and type of the wooden material to be processed, You may arrange | position so that the both sides | surfaces (cut end surface) of the wooden material made may be touched.

  In the above apparatus, the resin supply means may be configured to supply the resin only to the surface on which the suction port of the negative pressure suction means is disposed or to the surface on the opposite side. You may be comprised so that resin can be supplied to both the surface where the suction port is arrange | positioned, and the surface on the opposite side. The former apparatus is mainly suitable for obtaining a wood material impregnated with a resin mainly on only a part of the surface layer portion but not only on the surface layer portion, for example, the upper surface side surface portion or the lower surface side surface layer portion. It is done. The latter apparatus is preferably used mainly for obtaining a wood material in which only the surface layer portion is impregnated with resin, or the entire surface layer portion and inner layer portion are impregnated with resin.

  The resin supply means may be further configured to supply resin to both side surfaces of the wood material.

  In the present invention, the wood material to be treated may be any wood material that is degassed by the negative pressure suction treatment, and is made of solid wood, laminated wood, plywood, or PB, OSB, MDF, Any wood material such as wood fiberboard such as HDF is included.

  In the present invention, the resin used for impregnation includes all the resin materials that have been conventionally used to stabilize the physical properties of wood materials, such as urea resins, phenol resins, acrylic resins, melamine resins, Examples thereof include epoxy resins, vinyl acetate resins, ethylene vinyl acetate resins, polystyrene resins, and the like. Moreover, when using curable resin, arbitrary resin hardened | cured with a heat | fever, an ultraviolet-ray, etc. can be used. Further, the resin may be any of water-based, solvent-based and solvent-free.

  In the method and apparatus according to the present invention, the wood material to be subjected to resin impregnation is fed at a required speed. The suction port of the negative pressure suction means is brought into contact with the moving wood material. There is no particular limitation on the area where the suction port comes into contact, but in order to perform uniform impregnation, the suction port is brought into contact over almost the entire width of the wood material in the direction orthogonal to the moving direction, and the full width area is set as the negative pressure suction area. It is desirable. The width in the moving direction of the wooden material of the suction port is arbitrary, and there is no particular limitation, but the porosity of the wooden material to be impregnated and its moving speed, the physical properties of the resin to be impregnated, and the negative pressure suction pressure, etc. In consideration, it may be set experimentally so as to obtain a required resin impregnation rate.

  In the present invention, in the vicinity of the negative pressure suction port in the moving wooden material, how much area should be formed with the resin liquid layer to be impregnated is determined by the width in the wooden material movement direction of the suction port. Similarly, it may be set experimentally in consideration of the porosity and moving speed of the wood material to be impregnated, the physical properties of the resin to be impregnated, and the negative suction pressure. The larger the area of the sealing layer by the resin liquid layer to be impregnated, the better the efficiency of resin impregnation. However, the means for supplying the resin and the negative pressure suction means for that purpose require a large scale. On the other hand, if the area of the sealing layer by the resin liquid layer is small, the impregnation time cannot be sufficiently taken. Therefore, a sufficient impregnation rate cannot be obtained unless the feed rate is slowed down. What is necessary is just to form the sealing layer of a required area, considering the resin impregnation rate to obtain | require.

  In the present invention, the term “sealing layer by the resin liquid layer to be impregnated” means a thickness that does not cause destruction (vacuum breakage) in the resin liquid layer due to negative pressure when the internal air of the wooden material is sucked into the negative pressure. Is defined as a layer with thickness. In other words, when the internal air of the wood material is sucked into the negative pressure by suction from the suction port, the resin layer impregnated by the negative pressure is destroyed, and the outside air passes through the broken portion to the inside of the wood material. It is used to refer to a layer having a thickness that does not cause the phenomenon of entering the film. The thickness of the “sealing layer formed of the resin liquid layer to be impregnated” varies depending on the processing environment, in particular, how much negative pressure is used for suction.

  According to the present invention, the entire surface layer portion and the inner layer portion are uniformly impregnated with resin, or only the surface layer portion is uniformly impregnated with resin. Furthermore, not all of the surface layer portion, for example, the upper surface side surface layer portion or the lower surface side. A wood material can be obtained from a wood material in which only the surface layer portion is uniformly impregnated with resin.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a schematic view showing a resin impregnation apparatus that can suitably carry out a resin impregnation method for a wood material according to the present invention.

  The apparatus 10 includes a transfer roller 11, and the wood material 1 to be processed, which is, for example, a plate-like MDF, is sequentially fed in the direction of the arrow from the left to the right in the drawing. The lower resin supply means 12a, 12b and the upper resin supply means 13 are positioned so as to sandwich the wood material 1 to be processed in a liquid-tight manner from above and below. The width of each of the resin supply means (the width in the direction orthogonal to the transfer direction of the treated wood material 1) is the same as the width of the treated wood material 1. The lower resin supply means 12a and 12b are arranged at a distance in the transfer direction of the wood material 1 to be processed, and the suction port 20 of the negative pressure suction means is located so that there is no gap therebetween.

  The lower resin supply means 12 a and 12 b and the upper resin supply means 13 include a box-shaped container 14 whose side facing the treated wood material 1 is opened, and each container 14 has a resin injection hole 15. The resin injection hole 15 is connected to a resin tank (not shown), and the resin solution R is fed into each container 14 by the action of the liquid feed pump P. Appropriate liquid-tight means is applied to the peripheral edge of each container 14 and in contact with the upper and lower surfaces of the wood material 1 to be treated. The resin solution R does not leak to the outside.

  Although not shown in the drawing, similar structures are provided in both side surfaces (left and right end surfaces) of the wood material 1 to be processed and corresponding to the lower resin supply means 12a and 12b and the upper resin supply means 13. Left and right resin supply means are arranged.

  The suction port 20 of the negative pressure suction means is a sealed container provided with a large number of mesh-shaped openings 21 on the side facing the treated wood material 1, and the inside is connected to the vacuum pump VP via the openings 22 on the container side wall. is doing. Appropriate airtight means is applied to the peripheral edge portion where the suction port 20 is in contact with the lower surface of the wood material 1 to be treated, and external air is not sucked into the suction port 20 when negative pressure suction is performed by the vacuum pump VP. .

  The transfer roller 11 is operated to feed the wood material 1 to be processed between the lower resin supply means 12a, 12b, the upper resin supply means 13 and the left and right resin supply means (not shown). When the opening surface of the box-shaped container 14 constituting each resin supply means is closed by the upper and lower surfaces and both side surfaces of the wood material 1 to be treated, the liquid feed pump P is operated to feed the resin R to be impregnated, Each container 14 is filled with resin R. Thereby, a sealing layer made of the resin R is formed on the upper and lower surfaces and both side surfaces in the vicinity of the suction port 20 in the woody material 1 to be processed which is transferred in a state where the suction port 20 is in contact.

  Next, the vacuum pump VP is operated to evacuate the suction port 20. Thereby, the air in the to-be-processed wood material 1 is drawn in into the vacuum pump VP through the opening 21, and what is called deaeration advances. At the same time as the deaeration progresses, the negative pressure also appears on the upper and lower surfaces and both side surfaces of the treated wood material 1, which is a region near the suction port 20. Due to the developed negative pressure, the resin R in the box-shaped container 14, that is, the resin R forming a sealing layer formed on the upper and lower surfaces of the region near the suction port 20 in the treated wood material 1 is treated wood material. The inside of 1 is impregnated. Due to the impregnation, the deaerated space is immediately filled with the resin, and the replacement of the internal air with the resin is completed.

  Since this phenomenon proceeds continuously with the movement of the wood material 1 to be treated, a continuous resin impregnation treatment is applied to the plurality of wood materials 1 to be treated that are fed with their end faces in contact with each other. Thus, a wood material uniformly impregnated with resin can be obtained in a short time.

  Although not shown, when a sufficient amount of resin can be supplied, a plurality of spray nozzles are arranged in the box-shaped container 14 constituting the lower resin supply means 12a, 12b and the upper resin supply means 13. And you may make it form the sealing layer which consists of resin R in the front and back of the vicinity area | region of the suction port 20 in the to-be-processed wood material 1 with resin discharged | emitted from there. Further, both or both of the lower resin supply means 12a, 12b and the upper resin supply means 13 are shaped so as to cover both side surfaces of the wood material 1 to be treated. A sealing layer made of the resin solution R may also be formed on the surface side.

  Furthermore, when the area of both sides of the wood material to be processed is sufficiently smaller than the area of the front and back surfaces, that is, when processing a thin wood material, the left and right resin supply means are not arranged. However, it is possible to obtain a wood material impregnated with a resin as desired. Further, non-breathable cover plates are arranged on both side surfaces (left and right end portions) of the wood material 1 to be treated in the vicinity of the region where the lower resin supply means 12a, 12b and the upper resin supply means 13 are located. The outside air may be prevented from being sucked from the outside.

  Although not shown, the suction port 20 may be positioned on the upper surface side of the wood material 1 to be transferred. In this case, the lower resin supply means 12a and 12b and the upper resin supply means 13 are also transferred. It arrange | positions in the position reversed with respect to the wood material 1, respectively.

  Further, a wood material in which a resin impregnated layer is formed only on one surface by filling the resin solution R only in one of the lower resin supply means 12a and 12b or the upper resin supply means 13 and operating the apparatus. Can be obtained. Furthermore, when the objective is to manufacture a wood material having a resin-impregnated layer formed on only one surface from the beginning, either one of the lower resin supply means 12a and 12b or the upper resin supply means 13 is omitted. You can also.

Hereinafter, the present invention will be described by way of examples.
[Example 1]
Using the apparatus shown in FIG. 1, a resin impregnation treatment was performed using a medium fiberboard (MDF) as a sample as the wood material 1 to be treated. The sample dimensions are 3.0 mm thick, 315 mm wide, and 1840 mm long. As the resin to be impregnated, an acrylic resin aqueous solution having a resin fixed portion of 50% was used. In addition, when this resin is impregnated with a wood material, it is adsorbed in the wood cell wall, and is a resin that can obtain dimensional stability due to the bulk effect.

The suction rate of the vacuum pump VP was controlled so that the feed rate of the sample was 6 m / min, the resin supply rate was 20 liters / min, and the pressure of the vacuum gauge provided at the suction port 20 was maintained at a reduced pressure of 5 kPa. As a result, a resin-impregnated MDF sample having a resin impregnation rate of approximately 30% could be stably obtained. In addition, the resin impregnation rate was calculated | required by following Formula.
Resin impregnation rate (%) = [sample weight after impregnation (g) −sample weight before impregnation (g)] / sample weight before impregnation (g) × 100

  The dimensional change rate of the obtained resin-impregnated MDF sample was measured. The results are shown in Table 1. As shown in Table 1, the dimensional change rate at the time of moisture absorption and moisture release was suppressed to be smaller than that of the untreated sample, and the effect of the treatment according to the present invention was confirmed.

  In recent years, floor heating systems in which hot water or electric heaters are passed through the bottom of floor boards have become widespread, and floor base materials are required to have a small dimensional change due to changes in moisture content due to repeated heating and cooling. As a standard suitable for the material, it is strongly desired that the total value of the dimensional change rate during moisture absorption / release is 0.5% or less. The sample which performed the process by a present Example has achieved the target dimensional stability factor 0.5% or less.

[Example 2]
The resin impregnated MDF sample obtained in Example 1 was attached to the surface of the plywood as a surface base material to prepare a floor base plate. Furthermore, a decorative veneer was affixed to the floor base plate surface, a general painting process was performed, a residential floor was created, and a performance test was performed. The results are shown in Table 2.

  In Table 2, “MDF material breakage” refers to a phenomenon in which breakage occurs inside the MDF without peeling on the bonding surface, and means that good bonding is performed.

  As shown in Table 2, the resin-impregnated MDF obtained by this treatment method conforms to the JAS standard of the wood floor even in physical treatment such as strength, heat resistance, cold resistance, and water resistance. The effectiveness of the processing method according to the present invention is shown.

The schematic diagram which shows an example of the resin impregnation apparatus to the wooden material by this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Wood material to be processed, 10 ... Resin impregnation apparatus to wood material, 11 ... Transfer roller, 12a, 12b ... Lower resin supply means, 13 ... Upper resin supply means, 14 ... Box-shaped container, 15 ... Resin injection hole, DESCRIPTION OF SYMBOLS 20 ... Suction port of negative pressure suction means, 21 ... Opening of suction port, P ... Liquid feed pump, VP ... Vacuum pump, R ... Resin to impregnate

Claims (10)

  A method of sucking and impregnating a wooden material with a resin, wherein a resin liquid layer is formed on a part of the outer surface of the wooden material to be transferred so that a sealed layer is formed by the resin to be impregnated, and in this state It is characterized by simultaneously deaeration from the inside of the wood material and resin impregnation into the wood material by simultaneously sucking the internal air of the wood material from the vicinity of the resin liquid layer while transferring the wood material. Resin impregnation method for woody materials.   The sealing layer made of the resin to be impregnated is formed on the upper surface and / or the lower surface of the wooden material to be transferred, and negative pressure suction of the internal air is performed from the upper surface or the lower surface of the wooden material to be transferred. Resin impregnation method for woody materials.   3. The resin impregnation method for a wood material according to claim 1 or 2, wherein the resin impregnation is performed on the entire surface layer portion and inner layer portion of the wood material.   The resin impregnation method for a wood material according to claim 1 or 2, wherein the resin impregnation is performed only on a surface layer portion of the wood material.   The resin impregnation method for a wood material according to claim 4, wherein the resin impregnation is performed only on a part of a surface layer portion of the wood material.   It is transported in a state where it is in contact with the suction means of the transport means for transporting the wood material, the negative pressure suction means arranged so that the suction port is in contact with a part of the outer surface of the wood material to be transported, and the suction port of the negative pressure suction means Resin to wood material, comprising at least resin supply means for supplying resin so that a sealing layer of a resin liquid layer to be impregnated is formed on the outer surface region in the vicinity of the suction port in the wood material Impregnation equipment.   The apparatus for impregnating a wood material according to claim 6, wherein the suction port of the negative pressure suction means is disposed so as to contact an upper surface or a lower surface of the wood material to be transferred.   8. The wood material according to claim 7, wherein the resin supply means is configured to supply the resin only to the surface on the side where the suction port of the negative pressure suction means is disposed or to the opposite surface. Resin impregnation equipment.   The resin supply means is configured to supply the resin to both the surface on which the suction port of the negative pressure suction means is disposed and the opposite surface thereof. Resin impregnation equipment for wood materials.   The apparatus for impregnating a wood material according to any one of claims 6 to 9, wherein the resin supply means is configured to be able to supply resin to both side surfaces of the wood material.

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