JP2009083213A - Manufacturing method of right square bar for structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a manufacturing method of right square bar for structure efficiently manufacturing the right square bar for structure, having wood patterns of natural feeling and causing little warping or twisting with the lapse of time. <P>SOLUTION: In the manufacturing method of the right square bar for structure, laminas 3 with a rectangular section manufactured from a log 1 are dried and subjected to levelling at least for joining surfaces 31 in respective two laminas 3, 3 to be joined, an adhesive 35 is simultaneously applied to the joining surfaces 31 of the respective two laminas 3, 3, and the adhesive applied faces 31a, 31a are joined to each other and pressed to integrate the two laminas 3, 3. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a method for producing a structural square member that is preferably used for a pillar or a base of a wooden house.

  2. Description of the Related Art Conventionally, as a square member used for a pillar or foundation of a wooden house, a square member made of a straight and sufficiently thick log and naturally dried over a period of time has been widely used.

  However, in recent years, it has become difficult to obtain sufficiently thick logs, so lumber is made so that the outer periphery of thin logs is scraped off to obtain a square member including a log core, which is used as a prism or base for housing. It came to use for. In addition, it is also possible to remove the defects from lumber products with many defects, to obtain a wood chip with no defects and to obtain a small and short wood-timber product, and to use the laminated material obtained by gluing them vertically and horizontally as a prism or base for housing. It has been broken.

  However, a prism or base manufactured to include a core from a thin log has a problem that when it is dried, the surface and the inside are cracked, and the design and strength are deteriorated. In addition, the prism or base obtained from the laminated wood was able to solve the problem of cracking due to drying, but it was inferior in design because it was a material with a narrow short material adhered, and a decorative veneer was pasted on the outer periphery to compensate for it In this case, there is a new problem that the cost is high.

The applicant first divides the cored square timber made from the log into two divided materials by dividing the surface including the core into two divided materials, and after drying both divided materials, at least the divided surfaces in each of the divided materials. A method of manufacturing a column or a square for a base, in which unevenness is applied to the divided surfaces and then the divided surfaces subjected to unevenness are bonded to each other through an adhesive using a pressing device to integrate the two divided materials. Proposed (see Patent Document 1).
JP 2002-086415 A

According to the method described in Patent Document 1, the design has a wood pattern with a natural feeling on the surface as in the case of conventional cored squares made from logs, and the cracks on the surface and inside are remarkably suppressed. In addition, it is possible to economically produce a square member for a pillar or foundation having excellent strength.
However, the squares immediately after the split materials are integrated with each other using a press machine are straight and free of warping and twisting. However, when many of the same squares are manufactured, In some cases, warping occurred with the passage of time.
Moreover, when parting materials were bonded together using a water-based adhesive, the part which peeled partially might be recognized by the junction part of the parting materials of the obtained square material. Such peeling is not particularly problematic as a normal column or foundation, but is not preferable from the viewpoint of producing a higher performance structural material.

Accordingly, an object of the present invention is to provide a structural square material that can efficiently produce a structural square material that has a natural wood pattern and is less likely to warp or twist over time. A manufacturing method will be provided.
In addition, another object of the present invention is to efficiently produce a structural square material that has a natural wood pattern, has a natural wood pattern, and has excellent design and strength. The manufacturing method of the structural square material which can be performed is provided.

  In the present invention, a lamina having a rectangular cross-section made from logs is dried, and at least the surfaces to be phase-bonded in each of the two laminaes to be bonded to each other are subjected to unevenness processing, and then the surfaces to be phase-bonded to each of the two laminaes. By simultaneously applying the adhesive, and then providing the method for producing the structural square member characterized in that the two laminaes are pressed and integrated by bringing the adhesive-coated surfaces into contact with each other. The object has been achieved (hereinafter referred to as the first invention when referred to as the first invention).

  The present invention also provides a method for drying a lamina having a rectangular cross section made from a log, and performing at least surface removal on each of the two laminaes to be joined to each other, and then phase-joining each of the two laminaes. The adhesive is applied to the surface to be applied, and then the two adhesive coating surfaces of the lamina are brought into contact with each other and pressed, and after 40 seconds or more have elapsed from the start of pressurization, a high frequency is applied to the adhesive, The object has been achieved by providing a method for producing a structural square member characterized in that two laminaes are integrated through an adhesive (hereinafter referred to as the second invention). Say).

According to the manufacturing method of the structural square member of the present invention (first invention), the structural square member having a natural wood pattern and hardly warping or twisting over time can be efficiently obtained. Can be manufactured.
According to the manufacturing method of the structural square member of the present invention (second invention), the peeled portion is hardly formed at the joint portion between the laminaes, has a natural wood pattern, and has excellent design and strength. A square member can be produced efficiently.

  Hereinafter, the present invention will be described based on preferred embodiments thereof. FIG. 1 is a view for explaining each stage in one embodiment of the present invention, and FIG. 2 is a perspective view showing an example of a structural square member obtained by the method shown in FIG.

  In the present embodiment, as shown in FIGS. 1A and 1B, a cored square member 2 made of logs 1 is used as a raw material. Various known methods can be used as a method for producing the cored square member 2 from the log 1. In the present embodiment, a twin saw is used to connect the log 1 to four planes parallel to the center line. The cored square 2 having a substantially square cross section obtained by cutting in S1 to S4 is used as a raw material.

  Next, as shown in FIGS. 1 (b) and 1 (c), the cored square member 2 made from the log 1 is divided by a surface 22 including the core 21 into two divided members 3 and 3. These two divided members 3 and 3 are the lamina in this embodiment. As a means for dividing the core-held square member 2, various known devices that can cut the square member 2 along its longitudinal direction can be used. For example, a band saw, a circular saw, or the like can be used. Among these, a band saw is preferable. The cored square member 2 in the present embodiment has a core (log tree core) 21 along the longitudinal direction of the square member 2 at the center of the cross section, and when the cored square member 2 is divided. The cored square member 2 is cut at a plane 22 that passes through the center point of the cross section and is perpendicular to each of a pair of opposite side surfaces and parallel to the other pair of side surfaces.

Next, as shown in FIG. 1 (d), the obtained two divided members 3, 3 are separated from each other and dried. In drying, the two divided materials are preferably dried simultaneously in the same drying chamber. As a drying method of the divided materials 3 and 3, various methods conventionally known as a drying method of wood can be used without particular limitation, and natural drying or artificial drying may be used, or a combination of both may be used. As a preferable method of artificial drying, a method of placing in a drying apparatus in which temperature and humidity can be controlled and drying is exemplified.
As a preferable example of the method of using artificial drying and natural drying together, after natural drying for about 1 to 3 months (for example, 1.5 months in summer and 2.5 months in winter), 40 to 70 is performed. Examples thereof include a method of drying for about 10 to 60 days (more preferably about 5 to 30 days) in a drying apparatus adjusted to about ° C (more preferably 50 to 60 ° C). When natural drying is performed before artificial drying, the moisture content that is different from individual to individual can be dried to some extent uniformly to the core, and the energy cost of the drying process can be suppressed while preventing cracks on the surface and inside. it can.

  Moreover, it is preferable to dry simultaneously a pair of division material (lamina) which should be joined mutually. Moreover, when performing artificial drying, it is preferable to arrange | position adjacently in an apparatus. In either case, the degree of deformation and the moisture content are made the same as much as possible.

  It is preferable to perform drying of both divided materials (lamina) 3 and 3 so that the water content is 15% or less. By drying until the water content is 15% or less, the adhesiveness between the two divided materials (lamina) can be improved. Especially when the column is dried to 12% or less, the column has particularly excellent strength. Alternatively, a square member for a base can be obtained. However, excessive drying increases the deformation of the material and increases the risk of internal cracking. Energy costs also rise. Therefore, the moisture content after drying is preferably 8% or more, and the moisture content after drying is 8 to 15%, particularly 8 to 12% from the viewpoint of achieving both good adhesion and energy cost. Preferably there is.

Here, the moisture content of the divided material (lamina) is measured as follows. The center part in the longitudinal direction of each divided material (lamina) after drying is cut to a width of 30 mm to obtain a sample, and the weight W1 of the sample is measured. Next, the sample was prepared according to JIS Z 2201. Test method for wood According to the method for measuring the moisture content, the sample is left in a dryer at 105 ° C., and the weight W2 after the sample reaches a constant weight is measured. And a moisture content is calculated | required by the following formula.
Moisture content (%) = (W1-W2) / W2 × 100

  In this invention, since it dries in the state of the lamina before joining, compared with the case where it dries in the state of the cored square member 2, it can suppress significantly that a crack generate | occur | produces in the surface and the inside of a material. In addition, when the undried cored square 2 is dried as it is, for example, in cedar wood, the moisture content of the core material including the core is 75 to 150%, and the moisture content is further reduced to 8 to 15%. Due to the property of being difficult to cause, it is difficult to uniformly dry the material, and cracks occur on the surface and inside during drying. Therefore, it is not possible to obtain a pillar or a square for a base excellent in appearance and strength.

Next, at least the divided surfaces (the lumber surfaces generated during the division) 31 and 31 in each of the two divided materials 3 and 3 that have been dried are subjected to unevenness processing. In other words, the divided materials 3 and 3 after drying are often warped or distorted, as indicated by phantom lines in FIG. 1 (e), for example. Since there is a possibility that a sufficient strength may not be obtained, at least for both of the divided surfaces 31, 31, preferably all four side surfaces (the divided surface 31 and the other three side surfaces 32 to 34) of each divided material 3. Apply unevenness processing. In the present embodiment, the split surfaces 31 and 31 are surfaces to be phase-joined in the two split materials (lamina) 3 and 3, respectively.
Here, the unevenness removal process is a process for removing warpage and distortion generated on the side surface of the lamina (divided material in the present embodiment). As a means for performing unevenness processing, for example, various known devices such as an unevenness planar or a molder can be used, but in this embodiment, the four side surfaces of each divided member 3 are used by using a molder. Uneven processing is applied to all.

Moreover, in this embodiment, the unevenness removal process with respect to the two division | segmentation materials (lamina) 3 and 3 is performed substantially simultaneously. The time until the adhesive is applied to the exposed flat surface is made substantially the same by performing unevenness processing on the surfaces 31 and 31 to be phase-joined of the two divided members (laminas) 3 and 3 almost simultaneously. The moisture content of the surfaces to be phase-bonded can be made equal. Thereby, it is possible to further prevent warping of the manufactured structural square member.
Two laminas (processing equipment) are installed side by side as a method of performing unevenness machining on two laminaes almost simultaneously, and the two laminaes are introduced into both molders (processing equipment) simultaneously for processing. In order to process a large number of laminaes sequentially with one molder (processing apparatus), there are a method in which a pair of laminars joined together are successively introduced into the molder (processing apparatus).
For the pair of laminas to be phase-bonded, the time from the start of the unevenness machining for the lamina, whichever comes first, to the end of the unevenness machining for both laminas may be 5 to 30 seconds. Preferably, it is 8 to 20 seconds.

Next, as shown in FIG. 1 (f), the adhesive 35 is simultaneously applied to the surfaces 31 a and 31 a to be phase-joined of the two divided members (laminas) 3 and 3. In the present embodiment, as shown in FIG. 3, the two divided members 3 and 3 are conveyed in a parallel state, and both are supplied to the coating device 5 at the same time, and the adhesive is applied simultaneously in parallel. is doing.
The coating apparatus 5 shown in FIG. 3 uses the coating roller 51 in which an adhesive is continuously supplied to the peripheral surface, and simultaneously attaches the same amount to the surfaces 31a and 31a to be phase-joined of the two divided members 3 and 3. The agent 35 is applied. As an adhesive coating method, various known coating devices such as a spreader can be used. As the coating roller 51, various known ones can be used. The adhesive may be supplied to the peripheral surface through the roller or directly from the outside to the peripheral surface.

As in this embodiment, by applying the adhesive 35 to the two divided members 3 and 3 at the same time, the liquid (water) in the adhesive causes the surfaces 31 a and 31 a to be phase-joined between the two divided members 3 and 3. The amount of soaking becomes equal. Thereby, it is possible to effectively prevent warping of the manufactured structural square member.
In the application of the adhesive to the pair of laminas to be phase-bonded, the time from the application start time to the completion of the application is preferably within 60 seconds, and more preferably within 30 seconds. When applying to two laminas sequentially, the start of coating is the point in time when the application to the lamina to be applied first is started. As shown in FIG. If this is the case, it is the time when the coating starts. In the first invention, the mode in which the adhesive is applied at the same time includes, as shown in FIG. 3, the time from the start of application to the completion of application within 10 seconds in addition to the case of applying completely at the same time. Some cases are included.
It is preferable that the coating amount of the adhesive on both divided materials 3 and 3 is substantially the same, and the difference in the coating amount on both divided materials 3 and 3 is the coating basis weight of the larger coating amount. The difference (ab) between the amount (a) and the smaller coating basis weight (b) is preferably 20% or less of the coating basis weight (a) of the larger coating amount. % Or less is more preferable, and 5% or less is still more preferable.
The basis weight of the adhesive can be determined as appropriate according to the type of adhesive used. For example, in the case of an aqueous vinyl urethane resin adhesive, the adhesive is applied to the surfaces 31a and 31a to be phase-bonded. The basis weight is preferably 80 to 200 g / m ² , particularly preferably 120 to 160 g / m ² .

  As the adhesive, various known adhesives can be used. For example, urea resin, vinyl acetate resin, aqueous vinyl urethane resin adhesive and the like can be mentioned. In this embodiment, an aqueous vinyl urethane resin adhesive is used. ing. When the water-based vinyl urethane resin adhesive is used, since the adhesive strength is particularly high, sufficient strength can be obtained for the structural square material 4 and it is softer than iron after curing. It is possible to prevent the tool from being damaged during processing. Further, the aqueous vinyl urethane resin adhesive is advantageous in that it does not deteriorate the appearance even if it protrudes from the surface of the structural square member 4 and does not diffuse chemical substances such as formaldehyde into the atmosphere.

Next, as shown in FIG. 1 (g), the adhesive-coated surfaces 31a and 31a of the two divided members 3 and 3 are brought into contact with each other, and as shown in FIG. 3 is pressed and pressed from the side opposite to the abutting surface 36.
After the adhesive is applied, the time until the adhesive-coated surfaces 31a and 31a are brought into contact with each other is preferably within 20 minutes, particularly preferably within 10 minutes.
In this embodiment, as shown in FIG. 1 (h), a pair of split members 3, 3 placed on a support base 61 are pressed by a pair of pressure members 62, 62 from both sides in the horizontal direction. In addition to being capable of being pressed, a press device capable of irradiating a pressurized material from above with a high frequency is used. A member 63 in FIG. 1H is a high frequency head and has a function of irradiating the high frequency 63. FIG. 1 (h) shows a state in which only a pair of divided materials 3 and 3 in which the adhesive coated surfaces are in contact with each other is shown, but a set of divided materials in which the adhesive coated surfaces are in contact with each other. It is preferable that a plurality of sets 3 and 3 are arranged and pressed together.

Moreover, high frequency starts irradiation after 40 seconds or more have passed after the adhesive-coated surfaces of the two divided members (lamina) 3 and 3 are brought into contact with each other and pressure is started.
The adhesive is heated to a high temperature by high-frequency irradiation, but if irradiation is started immediately after pressurization, bubbles (gas) generated from the adhesive remaining at the interface between the lamina are soft parts of the grain of the lamina. (So-called Natsume) is pressed and deformed into a concave shape, whereby a peeled portion is formed at the joint between the laminas.
After pressing the adhesive coated surfaces together and starting pressurization, the time (hereinafter also referred to as heating delay time) until high frequency is applied is 40 seconds or longer, and moisture in the adhesive or adhesive is soaked in the lamina. In addition, it is possible to prevent the occurrence of exfoliation at the joint between the lamina by irradiating the high frequency after making the bubbles less likely to occur at the interface between the lamina. Obtainable. From the viewpoint of preventing the peeling portion from being generated, the heating delay time is preferably 50 seconds or more. The upper limit of the heating delay time is not particularly limited, but is preferably within 5 minutes, particularly preferably within 30 minutes, from the viewpoint of production efficiency.

  When the adhesive is dried and cured by high-frequency irradiation, the divided members (lamina) 3 and 3 are firmly bonded to each other, and the structural square member 4 having excellent strength can be obtained. High-frequency irradiation is performed, for example, for about 1 to 5 minutes, preferably about 1 to 3 minutes. After the irradiation of the high frequency irradiation, the structural regular square member 4 in which the divided members 3 and 3 are firmly bonded to each other is taken out from the press device.

  In this embodiment, the finishing work is further applied to the square member 4 after the divided members 3 and 3 are integrated. Here, the finishing process is a process for smoothing at least one of the side surfaces of the square member 4, and in particular, a finishing process is performed on a pair of side surfaces on which the joint portions of the divided members 3 and 3 appear on the surface. Thereby, the square material 4 which was further excellent in the designability can be obtained. The finishing process is preferably performed on all four side surfaces. In this embodiment, the finishing process is performed on all four side surfaces by a molder.

According to the manufacturing method of the structural square member of this embodiment, as described above, it has a natural wood pattern with a natural feeling similar to that of the conventional cored square member 2 and time has passed. However, it is possible to efficiently manufacture a structural square member that is less likely to warp or twist.
Moreover, according to the manufacturing method of the structural square material of the present embodiment, as described above, a peeled portion is unlikely to occur at the joint portion between the laminaes, it has a natural wood pattern, and has a good design and strength. An excellent structural square member can be efficiently produced.
The structural square material produced by the present invention is preferably used as various structural materials in wooden buildings, particularly wooden houses. Examples of structural materials for wooden buildings include columns, beams, and foundations.
Moreover, although the length and cross-sectional dimension of the structural regular square material manufactured by this invention can be suitably determined according to a specific use, if an example is given, the cross-sectional dimension shall be 80 mm x 80 mm-200 mm x 200 mm. And the length can be 2-15 m. Further, the vertical dimension and the horizontal dimension of the cross section may be slightly different. However, the vertical / horizontal dimension ratio is preferably about 0.9 to 1.1, more preferably 0.95 to 1.05, and even more preferably 1.

As mentioned above, although this invention was demonstrated based on the one embodiment, this invention is not restrict | limited to such embodiment, In the range which does not deviate from the meaning of this invention, it can change suitably.
For example, the pair of laminaes joined together are preferably obtained from logs of the same individual, but may be obtained from different individuals. In the above-described embodiment, the divided material (lamina) 3 is obtained from the log 1 through the cored square member 2, but two or three or more lamina 3 may be directly produced from the log 1.

Alternatively, as shown in FIG. 4, a single lamina 3 including a core may be lumbered from a single small-diameter log 1 and the lumbers lumbered in the same manner may be joined together to obtain a structural square member 4. . Moreover, as shown in FIG.5 and FIG.6, the lamina 3 which does not contain a core from the log 1 of a large diameter tree may be sawn, and those may be joined, and the structural square material 4 may be obtained. In the embodiment shown in FIG. 5, the two laminaes are joined with the backs of the trees facing each other. From the point of view, it is preferable.
The lamina used for the production of the structural square member 4 is preferably a single solid material having the same length as the structural square member 4, but before drying, after drying, before unevenness processing, or After removing the unevenness, the lamina may be connected in the longitudinal direction with a finger joint or the like in order to remove defects or extend in the longitudinal direction.

  In the first invention, a press device that does not have a high-frequency irradiation function may be used, and a cold press, a hot press, or the like may be used. In the second invention, the adhesive can be applied to the surfaces of the two laminaes to be phase-bonded at an arbitrary timing.

FIG. 1 is a process diagram showing each stage of a manufacturing process according to an embodiment of the present invention. FIG. 2 is a perspective view showing an example of a building square member obtained by one embodiment of the present invention. FIG. 3 is a perspective view showing an adhesive coating mode in one embodiment of the present invention. FIG. 4 is an explanatory diagram for explaining another embodiment of the present invention. FIG. 5 is an explanatory diagram for explaining another embodiment of the present invention. FIG. 6 is an explanatory diagram for explaining another embodiment of the present invention.

Explanation of symbols

1 Log 2 Core-supported square 21 Core 22 Surface including core 3 Split material (lamina)
31 Dividing surface 4 Structural square material

Claims (3)

The lamina having a rectangular cross-section made from logs is dried, and at least the surfaces to be phase-bonded in each of the two laminaes to be bonded to each other are stripped, and then the adhesive is simultaneously applied to the surfaces to be phase-bonded to each of the two laminaes. And then laminating the two laminaes by bringing the adhesive-coated surfaces into contact with each other and applying pressure to integrate them. The lamina having a rectangular cross-section made from logs is dried, and at least the surfaces to be phase-bonded in each of the two laminaes to be bonded to each other are stripped, and then an adhesive is applied to the surfaces to be phase-bonded to each of the two laminaes. After coating, the two lamina adhesive coated surfaces are brought into contact with each other and pressed, and after 40 seconds or more have elapsed after the start of pressurization, a high frequency is applied to the adhesive, and 2 A method for producing a structural square member, comprising laminating a book lamina. The method for producing a structural regular square material according to claim 1, wherein a water-based vinyl urethane resin adhesive is used as the adhesive.

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