JP5604491B2 - Surface hardening method for wood materials - Google Patents

Description

  The present invention relates to a surface hardening method by surface impregnation of a wood material.

Due to recent depletion of timber resources, it is difficult to obtain timber resources such as low-quality, high-quality southern materials such as lauan and capol, and North American materials represented by Douglas Fir.
Therefore, radiata pine and other softwood materials are attracting attention because of the abundant amount of resources and the speed of growth of Japanese cedar and imported wood.

When these are used as lumber products (solid wood), they are inexpensive, lightweight and easy to process, but coniferous wood is generally softer and harder than hardwood and has the disadvantage of being easily scratched. For example, in the case of radiata pine, the density is 450 to 550 kg / m ³ , and when used as a flooring, the surface hardness is insufficient and the surface is easily damaged.
In this way, when used for flooring, staircases, tables, etc., if the product is easily damaged during transportation or use, the commercial value will be reduced.

Such problems can be dealt with by providing a thick resin layer by coating on the surface of these soft woods or providing a layer impregnated with resin in the wood.
In the latter case, if the resin is impregnated in the range of about 1 to 2 mm from the surface, the surface hardness necessary and sufficient for the use of a flooring or the like can be obtained. That is, if the resin is impregnated and the density is partially 800 kg / m ³ , the overall weight increase is minimal, and the density increases only near the surface and the strength is improved, thus showing excellent practicality. It becomes like this.
In addition, in the case of a pillar material or the like, it is necessary to improve the overall strength, and for that purpose, the resin impregnation depth may be about 5 to 10 mm.

  Thus, the resin impregnation depth is required to be about 1 to 10 mm depending on the use of the wood material. Therefore, various methods for reinforcing the surface of the wood material have been developed.

  As such a method, for example, a method of painting a wooden material with a thick coating film is known. In this method, a paint that forms a tough coating film such as polyester is applied to the surface of the wooden material thickly. For example, in soft wood such as Radiata pine, it is necessary to apply a coating thickness of about 1 mm. However, it can be easily implemented with a coating machine. Further, if an ultraviolet curable coating or the like is used, productivity is good and mass production is possible.

In addition, a method is also known in which a wood material is immersed in a resin solution or a resin solution is applied to the wood material and the surface of the wood material is impregnated with the resin (for example, see Patent Documents 1 and 2).
In this method, a wooden material is immersed in a resin solution and left for a long time, whereby the surface of the wooden material is impregnated and cured. If it is a thin single board of 0.5 mm or less, it can be impregnated in a relatively short time, no special technique is required, and the apparatus may be as simple as a bat.

In addition, a method of impregnating a resin by injecting a resin liquid into a wood material by reducing pressure and pressurizing is also known (see, for example, Patent Documents 3 and 4).
In this method, a wooden material is immersed in a container filled with a resin liquid, put in a pressure tank, and decompressed and pressurized to release air inside the wooden material, and inject the resin liquid into this gap instead. Is. A reinforced wood impregnated and hardened with resin, generally referred to as “WPC”, is known, and a wooden material can be impregnated with a resin reliably and uniformly.

On the other hand, a method of partially removing the early wood part of the wood material and painting with a thick coating film is also known (see, for example, Patent Document 5).
This method uses a wire brush or sand blasting method to remove only the soft early wood part of the wood surface, or after consolidating the early wood part with a hard rubber roll, a paint that forms a tough coating such as polyester Is to paint thickly.
According to this method, a slight three-dimensional effect occurs after painting. Moreover, it can be easily carried out if there is an uneven processing device and a coating machine, and if UV curing paint is used, the productivity is good and mass production is possible.

In addition, a method is also known in which a wooden material is compressed with a pressing roll, and then a resin liquid is applied and absorbed by the restoring force of the wooden material to impregnate the resin (for example, see Patent Documents 6 to 8).
This method compresses a wood material using a pressing roll that can be applied with a high pressure several times the pressure (0.7 to 1.0 MPa) used for normal bonding, and is about 20 to 30% immediately after decompression. When restoring, the resin liquid is applied to absorb the resin liquid. Here, the portion compressed by the pressure roll is hardened because the density is increased.
In this method, continuous production is possible with a relatively simple apparatus such as a roll coater or a pressure roll. Further, the impregnation unevenness is relatively small and can be impregnated uniformly.

In addition, a method of impregnating a wood material with resin by high-pressure injection of a resin liquid is also known (see, for example, Patent Document 9).
In this method, a high-pressure jet used for cleaning or the like is applied to inject and inject a resin onto the surface of a wooden material.

JP 2004-66798 A Japanese Unexamined Patent Publication No. 63-288702 JP 2002-234002 A JP 60-92803 A Japanese Patent No. 3783037 JP-A-9-174514 Japanese Patent No. 3413543 Japanese Patent No. 3715982 JP 2001-179708 A

However, in the method of painting a wooden material with a thick coating, if the coating is made to the thickness necessary to ensure strength, the sharpness of the wood will be reduced and the plastic sheet will be stuck to the surface of the wooden material. Become. In addition, the touch is close to a cold plastic rather than a warm wooden material, and there is a drawback that the texture of the wooden material is lacking.
Further, since the surface of the wood material remains soft, there is a case where a spider web-like crack occurs in the coating film when an impact is applied. Further, since a large amount of resin is used, the cost increases and the weight also increases.

  Further, in the method of immersing a wooden material in a resin solution or applying a resin solution to a wooden material and impregnating the resin on the surface of the wooden material, in the case of immersing, there is a drawback that it does not impregnate unless it is immersed for several days to several weeks. is there. Moreover, even if soaked for a long time, the impregnable depth is as shallow as about 0.5 mm, and impregnation with a thickness larger than this is impossible with this method. When the impregnation is 0.5 mm, the resin impregnated layer is highly likely to be scraped off by sanding or the like when coating is performed with a uniform thickness after the resin impregnation and curing, and the strength and surface hardness are insufficient. On the other hand, in the case of coating, the treatment time is short, but the impregnation depth is very small and the strength is insufficient.

On the other hand, the method of impregnating the resin by injecting the resin liquid into the wood material by depressurization and pressurization requires a special device and has a drawback that the operation of the device is complicated. In addition, it is extremely difficult to control the impregnation depth, the impregnation unevenness is large, and in order to eliminate the insufficiently impregnated portion, it is necessary to impregnate considerably more. At this time, the resin is partially impregnated more than necessary, resulting in problems such as high cost and increased weight.
Here, there is also a method (insizing processing) that accelerates impregnation by scratching the surface of the wood material with a nail-shaped blade in advance, but since many scratches remain, only structural materials such as foundation angles and base materials and base materials are used Can not.
In addition, the method using reduced pressure and pressurization is called a batch method, which is a time-consuming method that requires a certain amount of processing, so that there are many steps and the productivity is extremely poor.

  In addition, in the method of partially removing the early wood part of the wood material and painting with a thick paint film, as well as the method of painting the wood material with a thick paint film, it is necessary to paint to a thickness necessary to ensure strength. There is a drawback that the texture of the woody material is lacking. Furthermore, when an impact is applied, a spider web-like crack may occur in the coating film. In addition, since a large amount of resin is used, the cost increases and the weight also increases.

  In addition, after compressing the wooden material with a pressure roll, the resin liquid is applied and absorbed by the restoring force of the wooden material to impregnate the resin. There is a disadvantage that there is a dimensional change called. This is a phenomenon in which unevenness occurs on the surface like a blister when trying to restore the thickness before compression when a high-density woody material absorbs moisture, and it is difficult to completely control this phenomenon. .

  Finally, in the method of impregnating the wood material with the resin liquid by high-pressure injection, the impregnable depth of the resin liquid is 1 mm or less from the surface, and the strength is often insufficient.

  Therefore, the object of the present invention is to harden the surface of a wooden material that can be impregnated with a resin solution by 1 mm or more from the surface of the wooden material, can be mass-produced with a relatively simple device, and has a stable dimension after the curing process. It is to provide a method.

In order to achieve the above-mentioned object, the surface hardening method of the wood material (1) according to claim 1 of the present invention is such that one surface of the wood material (1) is easily impregnated into the wood material by reducing the viscosity by heating. The photocuring catalyst-containing radical curable thermosetting resin (2) is immersed in a normal atmosphere for a predetermined time, and the thermosetting resin (2) is brought into a depth region of 1 mm or more from the surface of the wood material (1). Immersion step (200) for impregnation, cooling step (300) for cooling the wood material (1) immersed in the thermosetting resin (2), and thermosetting resin present on the surface of the cooled wood material (1) Surface hardening step (500) in which (2) is solidified by ultraviolet rays or electron beams, and heat that hardens the thermosetting resin (2) impregnated in the wood material (1) solidified in the surface by a hot press (4) And a pressing step (600).

Moreover, the surface hardening method of the woody material (1) according to claim 2 is a method for forcibly opening the edged wall hole for forcibly opening the edged wall hole of the woody material (1) such as cedar where the edged wall hole is closed. The process and one side of the wood material (1) are immersed in a photo-curing catalyst-containing radical curable thermosetting resin (2) that is easy to impregnate the wood material by heating for a predetermined time in a normal atmosphere. Immersing the thermosetting resin (2) in a depth region of 1 mm or more from the surface of the wooden material (1) and cooling the wooden material (1) immersed in the thermosetting resin (2) A cooling step (300), a surface solidification step (500) for solidifying the thermosetting resin (2) present on the surface of the cooled wood material (1) by ultraviolet rays or an electron beam, and a wood material ( solidified surface) 1) The thermosetting resin (2) impregnated in 1) with a hot press (4) And hot pressing step (600) for reduction, characterized in that it comprises a.

  Here, the cooling in the cooling step (300) means not only rapid cooling using a chiller or the like but also natural cooling (cooling).

  In addition, the symbol in the said parenthesis shows the corresponding element or corresponding matter published in the form for implementing invention mentioned later and drawing.

In the surface curing method according to claim 1 of the present invention, the viscosity of the thermosetting resin is lowered by heating so that the wood material is easily impregnated.
Further, since the wood material is immersed in the heated thermosetting resin, the wood material is warmed, and the air in the temporary conduit of the wood material is expanded and released to the outside. Therefore, the temporary conduit is more easily impregnated with the thermosetting resin instead of air. Therefore, it is possible to sufficiently impregnate an amount necessary for obtaining strength only by immersing one surface of the wooden material. That is, the thermosetting resin can be impregnated to a depth of 10 mm from the surface, which is impossible with the conventional method. In addition, the time required for the dipping process is shortened, and mass production is possible.
Further, since it is sufficient to prepare a thermosetting resin so that only one surface of the wooden material is immersed in the production line, the amount of the thermosetting resin can be reduced as compared with the case where the entire wooden material needs to be immersed.
In addition, since there is little impregnation unevenness, if there are many impregnation unevennesses, the impregnation for a long time which was necessary to eliminate the portion where the amount of impregnation is small is unnecessary, and the portion which is easily impregnated is not impregnated more than necessary. . Therefore, the processing time is shortened. Moreover, there is no unnecessary impregnation of thermosetting resin. Therefore, a small amount of the thermosetting resin to be impregnated is sufficient.

Further, in the dipping process in which the wood material is impregnated with the thermosetting resin, the wood material is more easily impregnated with the thermosetting resin than in the prior art, so that no special device or complicated operation of the device is required. In other words, it is sufficient to simply immerse the wood material in the thermosetting resin at room temperature and atmospheric pressure, so that it can be mass-produced with a simple device, requires little capital investment, and does not require any operator's skill.
In addition, since the surface of the wooden material itself is cured by impregnating the thermosetting resin, the coating film does not crack when an impact is applied to the wooden material.
In addition, since the thermosetting resin that protrudes outside the substrate can be scraped off, the wood material can be cured without leaving the original texture of the wood material without blurring the grain.

In addition, since a cooling process for cooling the wood material immersed in the thermosetting resin is provided, the viscosity of the impregnated thermosetting resin is increased and the wood material is less likely to ooze out.
In addition, since it has a hot-pressing process in which the thermosetting resin impregnated in the wood material is cured with a hot-press press, it is not necessary to compress the wood material, and even if the wood material absorbs moisture after a series of curing treatments, Does not occur. Therefore, there is no dimensional change after the curing process.

  Moreover, according to the surface hardening method of Claim 2, the edged wall hole opening process of forcibly opening the edged wall hole of the wood material in which the edged wall hole such as cedar is closed is provided as a pretreatment process. Therefore, the same effect as the surface hardening method according to claim 1 can be obtained even if the wood material has a closed wall hole.

  In addition, like the surface hardening method of the wood material of the present invention, one side of the wood material is immersed in a thermosetting resin that has been reduced in viscosity by heating so that the wood material can be easily impregnated in a normal atmosphere for a predetermined time. A method of impregnating a curable resin in a depth region of 1 mm or more from the surface of a wooden material and then cooling and further curing the thermosetting resin with a hot press is completely disclosed in the above-mentioned Patent Documents 1 to 9. Not listed.

It is a figure which shows the manufacturing process of the surface hardening method of the wooden material which concerns on 1st embodiment of this invention. It is a figure which shows the wood material used in the manufacturing process shown in FIG. It is a figure which shows an immersion process among the manufacturing processes of the surface hardening method of the wooden material which concerns on 1st embodiment and 3rd embodiment of this invention. It is a figure which shows the woody material which the surface impregnated with the thermosetting resin through the immersion process of the manufacturing process shown in FIG. It is a figure which shows a hot press process among the manufacturing processes shown in FIG. It is a figure which shows the manufacturing process of the surface hardening method of the wooden material which concerns on 2nd embodiment of this invention.

(First embodiment)
With reference to FIG. 1 thru | or FIG. 5, the surface hardening method of the wooden material 1 which concerns on 1st embodiment of this invention is demonstrated. Drawing 1 is a figure showing a manufacturing process of a surface hardening method of woody material 1 concerning a first embodiment of the present invention.

  The surface hardening method of the wood material 1 which concerns on 1st embodiment of this invention manufactures a flooring, and as shown in FIG. 1, the preheating process 100, the immersion process 200, the cooling process 300, the removal process 400, This is performed by the surface solidification process 500 and the hot pressing process 600, whereby the surface of the wood material 1 is cured.

As the wooden material 1, as shown in FIG. 2, a wooden material 1, for example, radiata pine, in which the peripheral wall hole is not completely closed was prepared.
This radiata pine is a conifer which has been attracting attention in recent years and is produced in large numbers in New Zealand and Chile, and has a density of 450 to 550 kg / m ³ . In the fast-growing area, the average annual ring width is wide and the proportion of low-density early wood part is relatively large, and the density is about 450 kg / m ^{3. In} the slow-growing area, the average annual ring width is narrow and low density early wood. The proportion of the portion is relatively reduced, and the density is about 550 kg / m ³ . Further, among the same materials, the early wood portion has a lower density than the late wood portion.
Such conifers are often softer than broad-leaved trees, and there is a difference in density depending on tree species, average annual ring width, early wood and late wood.

  Hereinafter, each process is demonstrated.

First, Radiata Pine lumber product (wood material 1), which is a solid material for flooring of 910 mm × 106 mm and thickness 12.5 mm, is prepared, and in the preheating step 100, the wood material 1 is put into a hot air dryer (not shown). The wood material 1 is preheated until it reaches 70 ° C.
By this preheating step 100, the air in the temporary conduit of the wooden material 1 is expanded, thereby releasing the air in the temporary conduit out of the wooden material 1.

Next, in the dipping process 200, as shown in FIG. 3, the thermosetting resin 2 is first put in the vat 3 having a size capable of dipping the wood material 1, and the thermosetting resin 2 is heated to 70 ° C.
This thermosetting resin 2 is a radical curable resin containing a photopolymerization catalyst that is cured by radical polymerization (photopolymerization) under irradiation of ultraviolet rays, electron beams, etc., and has a viscosity of 100 mPa · S or less at 70 ° C. In addition, a resin having a property of curing at 110 ° C. or higher was used. Examples of the radical polymerizable resin used here include polyester, acrylic, methacrylic, vinyl ester, polystyrene and the like, and those containing no organic solvent are desirable. The thermosetting resin 2 is not activated at 70 ° C., but a latent curing agent activated at about 110 ° C. or more is added in an amount of 0.2 to 1% by weight. 2 is stable.

Then, one surface of the wood material 1 that needs to be impregnated with the thermosetting resin 2 is placed on a conveyor belt (not shown) having a continuously moving wire mesh. The belt conveyor (not shown) is heated by being immersed in a thermosetting resin 2 in which only one surface under the wood material 1 is heated in a normal atmosphere (so-called room temperature and atmospheric pressure) for 5 to 10 minutes. The curable resin 2 is impregnated in a depth region of 1 mm or more from the surface of the wood material 1. The wood material 1 may be floated directly on the thermosetting resin 2 in the bat 3 without using a belt conveyor.
Here, since what is manufactured in this embodiment is mainly flooring, it is sufficient to impregnate only one surface that needs to be improved in hardness. Of course, it can also be applied to stair treads that require hardness.

  In this dipping process 200, the thermosetting resin 2 that has been heated to lower the viscosity is impregnated into a void such as a temporary conduit of the wooden material 1 from which air has been discharged in the preheating process 100.

  Here, as shown in FIG. 4, the impregnation part 1a and the surface layer 1b are formed in the wood material 1 which passed through the immersion process 200. As shown in FIG. The impregnated portion 1 a is literally a portion in which the temporary conduit of the wood material 1 is impregnated with the thermosetting resin 2. Further, the surface layer 1b is a thermosetting resin 2 attached to the surface of the wood material 1 or ejected from a temporary conduit of the wood material 1, and after a subsequent hot-pressing process 600, before the series of processes. Compared to the thickness of the wood material 1, the wood material 1 becomes thicker by the surface layer 1b.

Next, in the cooling step 300, the wood material 1 immersed in the thermosetting resin 2 is pulled up from the vat 3 and then naturally cooled for about 30 seconds until the belt material (not shown) moves to the next step apparatus. .
The surface temperature of the wood material 1 which was about 70 ° C. in the pre-immersion step 200 is lowered to about 50 ° C. by the cooling step 300.

  Next, in the removing step 400, the excess adhered to the surface of the wood material 1 by a roll coater (not shown) due to the kind of thermosetting resin blending composition in which dripping or ejection of the thermosetting resin easily occurs from the inside of the wood material. Remove the thermosetting resin 2. Thereby, it is possible to prevent the dust from adhering to the excess thermosetting resin 2 attached to the surface of the woody material 1.

  Next, in the surface solidification step 500, the thermosetting resin 2 present on the surface of the wood material 1 is solidified by an ultraviolet irradiation device (not shown). Furthermore, the base end side is also solidified in the same manner. In particular, there are many blowouts of the thermosetting resin 2 on the side of the mouth. Thereby, it is suppressed that the thermosetting resin 2 flows out from the temporary conduit | pipe of the wood material 1. FIG.

  Next, in the hot pressing process 600, as shown in FIG. 5, the thermosetting resin 2 impregnated in the wood material 1 is cured by the hot pressing 4 heated to 140 ° C. At this time, the pressure of the hot press 4 is 0.7 to 1.0 MPa, and the hot press time is about 1 minute. At this level of pressure, the wood material 1 is not compressed and springback cannot occur. Therefore, the dimensional change of the wood material 1 after a series of curing treatments does not occur except for the surface layer 1b.

  Finally, actual processing, surface sanding (polishing), and painting are performed to complete the process.

  According to the manufacturing method as described above, in the radiala pine which is the wooden material 1 in which the edge wall hole is not completely closed, the temporary conduit is focused and the wooden material is used as a pretreatment of the dipping process 200 in the preheating process 100. Since 1 is preheated to 70 ° C., the release of air existing in voids in the temporary conduit of the wood material 1 is promoted, and the thermosetting resin 2 is easily impregnated in the voids. Therefore, the depth that can be impregnated becomes deeper than before, and the impregnation speed increases, so that the time required for the dipping process 200 can be shortened.

  Further, according to this manufacturing method, since the thermosetting resin 2 is heated to 70 ° C. in the dipping process 200, the viscosity of the thermosetting resin 2 is reduced to 100 mPa · S or less, and the wood material 1 is easily impregnated. . Therefore, the amount necessary for obtaining the strength can be sufficiently impregnated.

  In this embodiment, the immersion step 200 is terminated when the surface is impregnated to a depth of 1 mm from the surface, but it is not impossible to impregnate deeper than that. It is possible to impregnate to a depth of 10 mm from the surface, which was impossible with the method. Here, it is possible to impregnate not only the late material portion having a high density but also the early material portion that is hard to be impregnated with the thermosetting resin 2 as compared with the late material portion. In addition, the time for the dipping process 200 is shortened, and mass production is possible.

Further, this manufacturing method includes the preheating step 100 and the dipping step 200, and the thermosetting resin 2 is more easily impregnated than before, so that there is little impregnation unevenness.
As a result, the treatment time is shortened and only a small amount of the thermosetting resin 2 is impregnated.
In addition, since only one surface of the wood material 1 is immersed, it is sufficient to prepare the thermosetting resin 2 that only the one surface of the wood material 1 is immersed in the production line. The amount of the functional resin 2 can be small.

  Moreover, in the immersion process 200, a special apparatus and complicated operation of the apparatus are unnecessary. That is, it is only necessary to simply immerse the wood material 1 in the thermosetting resin 2 at room temperature and atmospheric pressure, so that it can be mass-produced with a simple device, requires less equipment investment, and does not require any operator's learning. In addition, since no pressure reduction or pressurization is performed, power consumption in this step is small.

  In addition, in this manufacturing method, since the wood material 1 is naturally cooled after the impregnation step in the cooling step 300, the viscosity of the impregnated thermosetting resin 2 is increased, and the impregnated thermosetting property even in the early wood portion. It becomes difficult for the resin 2 to come out of the wood material 1.

  Moreover, in this manufacturing method, since the excess thermosetting resin 2 adhering to the surface of the wood material 1 is removed in the removing step 400, the dripping of the thermosetting resin 2 from the liquid material or the wood material 1 is likely to occur. By the thermosetting resin blending composition, it is possible to prevent the dust from adhering to the excess thermosetting resin 2 attached to the surface of the wood material 1. Therefore, workability after the next process is improved.

  In addition, in this manufacturing method, the thermosetting resin 2 is a photopolymerization catalyst-containing radical polymerizable resin. Therefore, by using an ultraviolet irradiation device (not shown) in the surface solidifying step 500, the surface of the wood material 1 is applied. The attached thermosetting resin 2 can be solidified by radical polymerization. Accordingly, even before the hot pressing step 600, the thermosetting resin 2 does not flow out of the wood material 1. Therefore, the finger touch of the wooden material 1 is improved. Therefore, even when the hot pressing process 600 cannot be performed immediately after the cooling process 300, the wood material 1 can be stored in a stacked manner.

  Further, in this manufacturing method, since the thermosetting resin 2 impregnated in the wood material 1 in the hot press process 600 is cured by the hot press 4, it is not necessary to compress the wood material 1 in a series of curing processes. . That is, since the thermosetting resin 2 is cured by heat of 110 ° C. or higher and a pressure that is low enough to be used for bonding at 0.7 to 1.0 MPa, even if the wood material 1 absorbs moisture after a series of curing treatments, the spring back Does not occur. Therefore, there is no dimensional change of the wood material 1 after the curing treatment.

  Moreover, in this manufacturing method, since continuous work can be performed from the preheating process 100 to the hot pressing process 600, the productivity is extremely good.

Further, since the impregnated portion 1a of the wood material 1 itself is cured by impregnation with the thermosetting resin 2, when an impact is applied to the wood material 1, cracks in the coating film to be applied later do not occur.
Further, since the impregnated portion 1a itself of the wood material 1 is cured, the surface layer 1b can be thinned or the surface layer 1b can be completely scraped off by sanding. Therefore, even if the wood material 1 is cured, the wood grain is not blurred and the original texture of the wood material 1 remains.

  In addition, since a curing agent that is not activated at 70 ° C. or lower is mixed, the pot life becomes longer at 70 ° C. or lower, and the thermosetting resin 2 heated by the bat 3 can be reused. It is.

(Second embodiment)
Next, with reference to FIG. 6, the surface hardening method of the wooden material 1 which concerns on 2nd embodiment of this invention is demonstrated. Drawing 6 is a figure showing the manufacturing process of the surface hardening method of woody material 1 concerning a second embodiment of the present invention. In addition, the same code | symbol was attached | subjected to the same part as 1st embodiment.

  In this embodiment, a wood material 1 having a closed wall hole such as cedar is prepared. For the wood material 1 whose edge wall hole is closed, such as cedar, the edge wall hole opening process 50 for forcibly opening the edge wall hole is performed as a pretreatment. The processing performed in the edge wall hole opening step 50 includes, for example, a microwave heating method for irradiating microwaves to open the edge wall hole, a laser insizing method for irradiating a laser, and steam heating for applying steam. There is a processing method. In addition, the peripheral wall hole can be opened by an oxygen treatment method, a supercritical carbon dioxide treatment method, a compression treatment method, or the like.

  For the wood material 1 that has been subjected to the edge wall hole opening step 50 in this manner, the preheating step 100, the dipping step 200, the cooling step 300, the removing step 400, the surface solidifying step 500, and the hot pressing step 600 are thereafter performed. The surface of the woody material 1 is cured. Each process from the preheating process 100 to the hot-pressing process 600 has exactly the same work content as the first embodiment.

  Therefore, even if it is the wood material 1 with which the edge wall hole is closed, the surface of the wood material 1 can be hardened similarly to the wood material 1 with which the edge wall hole is not completely closed.

(Third embodiment)
Next, the surface hardening method of the wood material 1 which concerns on 3rd embodiment of this invention is demonstrated. In addition, the same code | symbol was attached | subjected to the part same as 1st, 2nd embodiment.

In this embodiment, unlike the first and second embodiments, the wood material 1 is impregnated with the thermoplastic resin 5 instead of the thermosetting resin 2.
Here, as the wood material 1, Radiata pine, which is a wood material 1 in which the edge wall hole is not completely closed, was prepared.

  Hereinafter, each process is demonstrated.

First, an immersion process is performed. As shown in FIG. 3, in this step, a polyamide resin (a terpene phenol resin, a rosin, a rosin derivative, or a polyester is used instead of a thermoplastic resin 5 on a vat 3 having a size capable of dipping the wood material 1. And the thermoplastic resin 5 is heated to about 160 ° C.
The thermoplastic resin 5 is solid at room temperature, but when heated to 160 ° C., it becomes a liquid having a viscosity that can be impregnated into a temporary conduit.

  The actual dipping operation itself is the same as in the first and second embodiments, and dipping for a predetermined time until the thermoplastic resin 5 is impregnated in a depth region of 1 mm or more from the surface of the wooden material 1 under a normal atmosphere. Thereafter, the wood material 1 is pulled up from the liquid thermoplastic resin 5.

Next, in the cooling step 300, the wood material 1 immersed in the thermoplastic resin 5 is naturally cooled. However, this cooling process 300 is not purposely provided, but is naturally cooled at room temperature while the wooden material 1 is being conveyed by a belt conveyor (not shown).
The surface temperature of the wood material 1 falls within a few minutes pulled up from the bat 3. That is, the viscosity of the impregnated thermoplastic resin 5 becomes so high that the thermoplastic resin 5 does not flow out of the temporary conduit of the woody material 1, and then the thermoplastic resin 5 is completely solidified. As described above, the thermoplastic resin 5 is solidified at room temperature.

According to the manufacturing method as described above, the wood material 1 is heated because it is heated to 160 ° C. and becomes liquid, so that the wood material 1 is warmed and the air in the temporary conduit of the wood material 1 expands to the outside. Is released. Therefore, even if the resin to be impregnated is the thermoplastic resin 5, the temporary conduit is easily impregnated.
Further, since the thermoplastic resin is impregnated, the hot pressing step 600 for solidification which is necessary when the thermosetting resin 2 is impregnated becomes unnecessary. Therefore, mass production can be performed with less equipment.

In the preheating step 100 of the first embodiment and the second embodiment of the present invention, the temperature at which the wood material 1 is preheated is 70 ° C., but is not limited thereto, and may be 60 to 80 ° C. In this step, it is desirable to preheat and discharge the air present in the peripheral wall hole of the wooden material 1, but in the next immersion step 200, the wooden material immersed in the heated thermosetting resin 2 The preheating step 100 is not necessarily required if the immersion step 200 takes time until the 1 is warmed and the air in the peripheral wall hole is discharged. When the hot air dryer (not shown) is not owned, or when the hot air dryer (not shown) is preferentially used for work with other products, the preheating step 100 can be omitted.
However, when the preheating process 100 is omitted, the surface temperature of the woody material 1 in the dipping process 200 is about 50 ° C., and the temperature is low, and the air escape from the edge wall hole becomes worse, and the thermosetting is performed. It becomes difficult to impregnate the woody material 1 with the conductive resin 2. In this case, the surface temperature of the woody material 1 in the subsequent cooling step 300 is about 40 ° C.

  Moreover, the temperature of the thermosetting resin 2 heated by the immersion process 200 is not restricted to 70 degreeC, and may be 60-80 degreeC. Here, when it is set to 80 degreeC, the deaeration of the air in the wood material 1 is accelerated | stimulated further, and the impregnation of the thermosetting resin 2 is also accelerated | stimulated. By doing so, the hot press 4 can also be manufactured by a continuous press using microwaves, and mass production becomes easier.

  Moreover, although the cooling process 300 was natural cooling, it is not restricted to this, In order to cool earlier, you may rapidly cool with a chiller etc.

  In addition, in the removing step 400, the excess thermosetting resin 2 is wiped with a roll coater. However, the present invention is not limited to this. For example, the extra thermosetting property of the surface using other means such as a reverse roll or a sponge roll. The resin 2 may be wiped off.

  Further, the removing step 400 is not always necessary. Depending on the type of thermosetting resin compounding composition in which dripping or jetting of the thermosetting resin 2 does not easily occur and dust hardly adheres to the surface even after the dipping process 200, the removing process 400 can be omitted.

Moreover, the surface solidification process 500 is not necessarily required. If the operation can be performed continuously up to the hot pressing step 600, it is not necessary to stack and store the woody material 1 during the processing, and the surface solidifying step 500 can be omitted. This is because it can be stored without stickiness after the hot pressing process 600.
Alternatively, the surface layer 1b can be solidified by adding a curing agent such as peroxide or azoisobutyronitrile to the thermosetting resin 2 in the dipping process 200, and the surface solidifying process 500 can be omitted. Alternatively, the surface layer 1b can be solidified by adding a curing agent such as peroxide to the thermosetting resin 2 in the dipping process 200, and the surface solidifying process 500 can be provided.

  In the first embodiment and the second embodiment of the present invention, as the thermosetting resin 2, a radical polymerizable resin having a property of being 100 mPa · S or less at 70 ° C. and being cured at 110 ° C. or more is used. Although it is used, even if it is not a radically polymerizable resin, the viscosity is 100 mPa · S or less at 70 ° C., and a resin having a property of curing at 110 ° C. or more, and the viscosity at 70 ° C. is 100 mPa · S or less, Radical polymerizable resin that does not satisfy the condition of having a property of curing at 110 ° C. or higher, or other thermosetting resin (for example, epoxy resin, phenol resin, etc.), that is, a viscosity of 100 mPa · S at 70 ° C. Thermosetting that does not satisfy the condition that it has the property of being cured at 110 ° C. or higher as well as below. Them resin on the surface from above 1mm depth region of soaked wood material into heated to 60-80 ° C. using a fat can also be impregnated.

Moreover, although the impregnation depth was 1 mm, it is not restricted to this, The impregnation depth shall be 1-10 mm by the tree species to be used and a use application (required surface hardness). However, when the impregnation depth is increased, the time required for the dipping process 200 becomes longer.
Here, it is necessary to change the hot press time in the hot press step 600 depending on the impregnation depth, and the hot press time must be added for 1 minute for every impregnation depth of 1 mm.

  Further, in the third embodiment, the thermoplastic resin 5 is impregnated in the radiata pine in which the edge wall hole is not completely closed. However, the present invention is not limited to this, and the edge wall hole similar to the second embodiment is used. Through the opening step 50, the thermoplastic resin 5 can be impregnated even in the wood material 1 in which the peripheral wall hole such as cedar is closed.

In addition, the use of wood material 1 is not limited to flooring, but for buildings that use wood material 1 such as pillar materials, foundation corners, doors, stair treads, wall materials such as waist walls, furniture, and counters. All materials and furniture can be applied.
Moreover, it is not restricted to performing the surface hardening method only on one surface of the wood material 1, The surface to be immersed can be changed according to a use or required intensity | strength. For example, the hardness of all the surfaces can be increased by immersing all the surfaces.
In particular, if the present invention is used for a foundation corner or the like, the durability of the foundation corner itself can be improved, and the fixing bolts and hardware of the structural material can be prevented from loosening, so that the durability and even the life of the house are improved.

  In addition, it is possible to obtain a natural luster if polishing is performed instead of painting after actual processing. Further, when the painting is omitted and the sanding finish or the polishing finish is left, the surface layer 1b portion is scraped off, so that the appearance and the touch are the same as those of natural wood. Nevertheless, since the impregnated portion 1a is cured, the impregnated portion 1a is more resistant to contamination than the wood material 1 that has not been subjected to the curing treatment.

  Moreover, in order to improve the surface hardness, the wood material 1 is impregnated with the thermosetting resin 2 or the thermoplastic resin 5, but by using other liquids, it can be applied for purposes other than the improvement of the hardness. For example, the wooden material 1 can be immersed in an antiseptic or a coloring agent, and the wooden material 1 can be impregnated with the liquid.

DESCRIPTION OF SYMBOLS 1 Wood material 1a Impregnation part 1b Surface layer 2 Thermosetting resin 3 Butt 4 Hot press 5 Thermoplastic resin 50 Edged hole opening process 100 Preheating process 200 Immersion process 300 Cooling process 400 Removal process 500 Surface solidification process 600 Hot pressure Process

Claims (2)

One side of the wood material is dipped in a photocuring catalyst-containing radical curable thermosetting resin that is easy to impregnate the wood material by reducing the viscosity by heating under a normal atmosphere for a predetermined time, and the thermosetting resin is then added to the wood material An immersion step of impregnating a depth region of 1 mm or more from the surface of the material;
A cooling step for cooling the wood material immersed in the thermosetting resin;
A surface solidification step of solidifying the thermosetting resin present on the surface of the cooled woody material by ultraviolet rays or an electron beam;
A method of curing the surface of the wooden material, comprising: a hot pressing step of curing the thermosetting resin impregnated in the solidified wooden material with a hot press. A step of opening a framed wall hole for forcibly opening the framed wall hole of a wooden material such as a cedar with a closed wall hole;
One side of the wood material is immersed in a photocuring catalyst-containing radical curable thermosetting resin that has been reduced in viscosity by heating so that the wood material is easily impregnated in a normal atmosphere for a predetermined time, and the thermosetting resin is An immersion step of impregnating a depth region of 1 mm or more from the surface of the wood material;
A cooling step for cooling the wood material immersed in the thermosetting resin;
A surface solidification step of solidifying the thermosetting resin present on the surface of the cooled woody material by ultraviolet rays or an electron beam;
A method of curing the surface of the wooden material, comprising: a hot pressing step of curing the thermosetting resin impregnated in the solidified wooden material with a hot press.

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