JP5760186B2 - Glulam production method and glulam produced by the production method - Google Patents

Description

  The present invention relates to a method for producing a laminated material and a laminated material produced by the production method.

  Conventionally, wide wooden building materials are generally treated as high-grade building materials. In general, laminated wood is used as a wide wooden building material used for interior materials and furniture. This laminated lumber is made by adhering a flitch from which natural wood knots and chips have been removed at the side hooks to make it wider.

  In the production of these laminated timbers, the color tone is usually different for each flitch material, so it is necessary to match the color tone of the flitch material used during the manufacturing process and to arrange the grain in order to make it appear as a natural piece without a sense of incongruity. It was very time consuming.

  In order to solve such a problem, after a flitch material is bonded to form a laminated material, the surface is colored with a dark-colored paint, and the whole color tone is adjusted to show one piece.

  However, according to this method, there is a problem that only a dark-colored laminated material can be obtained, or the wood grain is crushed by the paint and the texture of natural wood is impaired.

  For such a problem, a method has been proposed in which the surface of the flitch material for forming a laminated material is subjected to a treatment with high-temperature steam, and the surface is colored brown by changing the components contained in the wood (for example, Patent Documents 1 and 2).

  These conventional proposals are excellent methods in that natural coloring with emphasized grain is obtained and the color difference of each flitch material is improved.

JP 2010-6045 A JP 2010-76194 A

  However, even in the case of flitch materials whose color difference has been improved by these proposed methods, when these are glued together by adhering at the horizontal hooks, the straight lines of the horizontal hooks and the deviation of the grain are conspicuous. There was a problem.

  The present invention has been made in view of the circumstances as described above, without crushing the grain, making the horizontal hook part inconspicuous when laminated, creating a sense of unity of each piece, and light resistance It is an object of the present invention to provide a method for producing a laminated material having excellent properties and a laminated material produced by the production method.

The present invention is characterized by the following in order to solve the above problems.
That is, the method for producing a laminated material of the present invention is a method for producing a laminated material obtained by adhering a flitch material. After coloring and adhering the flitch material by high-temperature steam treatment, the surface is coated with a coating having a different color density. there are, have rows paint color density changes astride the lateral gore portion between adjacent flitch material, characterized in that it inconspicuous the displacement of the straight line and grain of the horizontal gore portion.

  In this method for producing a laminated material, it is preferable to print a pattern for making the adhesive portion inconspicuous on the surface of the horizontal hook portion after coating with different color densities.

  Further, the method for producing a laminated material of the present invention is a method for producing a laminated material obtained by adhering a flitch material, and after coloring and adhering the flitch material by high-temperature steam treatment, an adhesive portion is attached to the surface of the horizontal hook portion. It is characterized by printing a pattern for making the image inconspicuous.

  Furthermore, in the manufacturing method of the said laminated material, it is preferable that high temperature steam processing is the range of processing temperature 100-160 degreeC, and processing time 0.5-5 hours.

  Moreover, the laminated material of this invention was manufactured by the manufacturing method of the said laminated material.

  According to the method for producing a laminated material of the present invention, after coloring and adhering the flitch material by high-temperature steam treatment, the color tone of the horizontal hook portion is aligned without damaging the grain by performing coating with different color density on the surface. Thereby, it can be set as the laminated material which reduced the sense of incongruity of a horizontal hook part.

It is a schematic front view of the high-pressure high-temperature steam pot suitably used in the present invention. It is a schematic perspective view which shows the state which piled up the flitch material. It is a schematic sectional drawing which shows the state which mounted the flitch material in the high-pressure / high-temperature steam kettle. It is a top view which shows the laminated material (B) which provided the coating (A) in which the boundary line from which a shading differs crosses a horizontal hook part. It is a top view which shows the laminated material which provided the diagonal line and the curved pattern with respect to the horizontal hook part. It is a top view which shows the state of the flitch material in each process of the manufacturing method of the laminated material of this invention, and a laminated material.

Embodiments of the present invention will be described below.
The method for producing a laminated material of the present invention is a method for producing a laminated material obtained by adhering a flitch material, and after coloring and adhering the flitch material by high-temperature steam treatment, a coating having a different color density on the surface, or The pattern is printed so as to make the adhesive part inconspicuous.

  The wood used as the flitch material used in the method for producing the laminated timber of the present invention can be used without particular limitation as long as it is usually used as a laminated timber, such as cedar, larch, bay pine, rubber tree, Hippopotamus, beech, oak, beach, oak, teak, hard maple, cherry, walnut, white ash, mahogany, and various other tree species.

  In the method for producing a laminated material of the present invention, first, the flitch material is colored by uniforming the color tone by performing high-temperature steam treatment.

  The coloring by the high-temperature steam treatment is performed by selectively thermally decomposing and reducing the quality of hemicellulose among cellulose, hemicellulose, and lignin, which are the main components of the wood composition.

  Hemicellulose has a mediating role in immobilizing cellulose with lignin, and the alteration and reduction of hemicellulose has a greater effect at the high-density part of the wood fiber cell tissue. Is also promoted.

  Since the degree of coloring by this high-temperature steam treatment depends on the treatment temperature and treatment time, it is necessary to appropriately adjust the treatment conditions according to the type of wood and the target color tone.

  As conditions for the high-temperature steam treatment of the present invention, the treatment temperature is 100 to 160 ° C., preferably 120 to 150 ° C., and the treatment time is 0.5 to 5 hours, preferably 1 to 3 hours.

  By setting it as this range, appropriate coloring can be achieved by modifying the hemicellulose contained in the wood, the color difference of each flitch material can be reduced, and the strength of the flitch material can be made uniform.

  In addition, it is more preferable that the high temperature steam treatment of the present invention is performed in a high pressure atmosphere so that the high temperature steam can act efficiently inside the flitch material. In this case, the pressurizing condition is preferably in the range of 0.1 to 0.4 MPa.

  As a processing apparatus for performing this high-temperature steam treatment, any apparatus can be used without particular limitation as long as it satisfies the conditions of the high-temperature steam treatment specified in the present invention. It can be particularly preferably used.

  Hereinafter, the high-temperature steam treatment of the present invention using the high-pressure high-temperature steam kettle shown in FIG. 1 will be specifically described in detail. In addition, the high temperature steam processing performed with the manufacturing method of the laminated material of this invention is not limited to the high temperature steam processing using this apparatus.

  A high-pressure and high-temperature steam kettle 20 shown in FIG. 1 includes a steam kettle main body 21, a steam feed pipe 23, a pressurized water feed pipe 24, a pressurized air feed pipe 25, an exhaust pipe 26 and a drain pipe 27.

  The steam pot main body 21 has airtightness, and can store a flitch material that performs high temperature steam processing inside. The steam supply pipe 23 is provided to supply high-temperature steam 3 from a steam supply source (not shown) into the steam kettle body 21, and the pressurized water supply pipe 24 supplies the pressurized water 4 for cooling the flitch material 1 to the steam. It is provided for feeding into the hook body 21.

  The pressurized air supply pipe 25 is provided to supply the pressurized air 5 from a pressurized air supply source such as a compressor (not shown) into the steam cooker main body 21, and the exhaust pipe 26 sends steam or gas to the steam cooker. It is provided for discharging outside the main body 21 and for controlling the atmospheric pressure inside the steam pot main body 21. Further, the drain pipe 27 is provided for discharging the liquefied water vapor or cooling water from the water vapor pot main body 21.

  Further, a steam supply valve 23a, a pressurized water supply valve 24a, a pressurized air supply valve 25a, an exhaust valve 26a, and a drain valve 27a are provided in the middle of each pipe connected to the steam pot main body 21. By opening and closing these, the water vapor amount, temperature, and pressure inside the water vapor pot main body 21 can be controlled.

  As shown in FIG. 2, the flitch material 1 subjected to the high-temperature steam treatment in the steam pot main body 21 is formed by laminating a plurality of flitch materials 1 by forming gaps between the upper and lower flitch materials 1 with a crosspiece member 6 interposed therebetween. As shown in FIG. 3, it arrange | positions on the mounting plate 8 in the steam pot main body 21. As shown in FIG.

  At this time, a lifting prevention means 7 such as a weight may be provided so that the laminated flitch material 1 does not float in the steam pot main body 21 during the cooling process of the flitch material 1 described later.

  As described above, after the flitch material 1 is arranged in the steam pot main body 21, the steam pot main body 21 is sealed by the opening / closing lid 22, and among the valves of the pipe connected to the steam pot main body 21, the steam supply valve 23 a. The exhaust valve 26a is opened, the other pressurized water supply valve 24a, the pressurized air supply valve 25a, and the drain valve 27a are closed, the high-temperature steam 3 is supplied into the steam kettle body 21, and the air in the steam kettle body 21 is opened. Is replaced with hot steam 3.

  Next, with the high-temperature steam 3 supplied, the exhaust valve 26a is closed, and, for example, the inside of the steam pot main body 21 is gradually raised and raised to a predetermined processing temperature and pressure at 1 to 3 ° C./min. Maintain for a predetermined time.

  The temperature and pressure in the steam pot main body 21 can be measured by, for example, an appropriate temperature sensor or pressure gauge installed on the inner wall of the steam pot main body 21.

  The treatment temperature, pressure and time can be appropriately set according to the type and size of the material wood subjected to the high-temperature steam treatment, and the coloring degree of the material wood can be easily controlled by this setting.

  After the high-temperature steam treatment is performed in such a procedure and a predetermined treatment time elapses, the material wood is cooled and the pressure reduction treatment in the steam kettle main body 21 is performed.

  The pressure reduction treatment in the steam pot main body 21 is preferably performed after the wood core is cooled to a predetermined temperature or less from the viewpoint of preventing dry cracking of the material wood.

  Therefore, normally, before the pressure reduction process is performed, the wood is submerged and cooled in a state where a predetermined high pressure state is maintained in the steam pot main body 21.

  As a specific method of cooling while maintaining this high pressure state, the steam supply valve 23a is closed, the pressurized water supply valve 24a and the pressurized air supply valve 25a are opened, and the opening and closing control of the exhaust valve 26a is performed. While maintaining a high pressure state so that the pressure in the pot main body 21 does not decrease, the flitch material 1 in the steam pot main body 21 is submerged and cooled.

  Moreover, it replaces with the aspect which cools raw material wood by submergence as mentioned above, and after the high temperature steam process, the steam supply valve 23a may be closed and the flitch material 1 may be naturally cooled.

  Furthermore, the steam supply valve 23a is closed, and the pressurized air supply valve 25a and the exhaust valve 26a are controlled to open and close in a state where the inside of the steam pot main body 21 is maintained at a predetermined high pressure state. May be replaced and cooled.

  After the flitch material 1 is cooled, the pressurized water supply valve 24a and the pressurized air supply valve 25a are closed, the exhaust valve 26a and the drain valve 27a are opened, and the pressure in the steam cooker body 21 is returned to atmospheric pressure. The cooling water in the main body 21 is discharged out of the steam pot main body 21.

  Even when the pressure in the steam pot main body 21 is returned to the atmospheric pressure, it is preferable that the exhaust valve 26a and the drain valve 27a be controlled to be gradually returned to the atmospheric pressure so that a sudden pressure fluctuation does not occur. .

  The pressure reduction in the steam pot main body 21 may be performed by opening the exhaust valve 26a before discharging the cooling water to the outside of the steam pot main body 21, or both the exhaust valve 26a and the drain valve 27a. May be performed while the cooling water is discharged.

  After performing the pressure-lowering treatment, the flitch material 1 is taken out from the steam pot main body 21 to complete the high-temperature steam treatment. By performing such high-temperature steam treatment, the color difference of each flitch material 1 can be reduced.

  Next, precise finishing is performed on the flitch material that has been subjected to the high-temperature steam treatment in order to obtain a desired size for forming a laminated material and to smooth the entire surface of the flitch material.

  There is no particular limitation on the processing method for this precise finishing as long as the dimensions can be adjusted and the surface smoothed. However, for example, the horizontal hook portion is precisely finished by cross-cut saw processing, and the other surfaces are precisely processed by molder processing. Dimensional finishing is preferred.

  Further, at this stage, precise finishing of only the horizontal hook portion may be performed, and precise finishing of the surface other than the horizontal hook portion may be performed after bonding the horizontal hook portion.

  After each flitch material is precisely processed in this manner, the horizontal hook portions of the plurality of flitch materials are assembled and bonded to produce a laminated material. As the adhesive used for the assembly adhesion, it is usually possible to use any adhesive as long as it is an adhesive capable of adhering a wet flitch material, and a moisture curing type urethane adhesive can be particularly preferably used.

  In the manufacturing method of the laminated material of this invention, after the horizontal hook part adhere | attaches, in order to make this adhesion | attachment part smoother, the surface is smoothed. In this smoothing treatment, it is preferable that the entire surface of the laminated material is surface-finished.

  Next, in the manufacturing method of the laminated material of this invention, after performing the smoothing process of the surface of a laminated material, the surface from which a color density differs is given. Alternatively, a pattern is printed to make the adhesive part inconspicuous. Or do both of these.

  Here, the coating with different color density in the present invention is not a coating having a uniform color tone on the surface after coating, but a coating imparting a natural gradation-like shade or a coating imparting natural spots. Is performed on the entire surface of the adjacent flitch material.

  The color tone, shade difference, shape, and the like of the coatings having different color densities according to the present invention can be appropriately set according to the color tone and grain of the whole laminated material before coating, and specifically, as shown in FIG. In addition, the laminated material 11-1 (B) provided with the coating (A) in which the boundary lines having different shades intersect with the horizontal hook part, or the laminated material provided with a patchy coating so as to straddle the horizontal hook part. it can.

  By giving a coating having a different color density so as to straddle the horizontal hook between the adjacent flitch materials, a sense of unity of the entire laminated material 11-1 is born, and the adhesive portion of the horizontal hook and the shift of the grain Can be made inconspicuous. By giving a gradation-like coating in particular, a sense of unity of the entire laminated material 11-1 is particularly born, and it is possible to make the adhesive part of the horizontal hook part and the shift of the wood grain inconspicuous.

  As the paint used for coating with different color densities of the present invention, it can be used without limitation as long as it is a paint used for clear coating that is usually applied to the surface finish of the laminated material. Can be suitably used.

  Moreover, in the manufacturing method of the laminated material of this invention, in order to make the linearity of the adhesive part of a horizontal hook part inconspicuous, after performing the smoothing process of the surface of a laminated material, and coating the surface with a clear urethane resin paint etc. Moreover, it can be set as the laminated material which printed the diagonal line pattern with respect to the horizontal hook part, the laminated material 11-2 etc. which printed the curved pattern as shown in FIG. By printing a pattern for making the adhesive part inconspicuous on the surface of the horizontal hook part, a sense of unity of the entire laminated material 11-2 is born, and the adhesive part of the horizontal hook part and the shift of the grain are made inconspicuous. be able to.

  The printing method of the diagonal line pattern or the curved pattern is not particularly limited, and can be performed by a printing method such as screen printing, inkjet printing, or offset printing.

  Furthermore, in the manufacturing method of the laminated material of this invention, after giving the coating from which color density differs on the surface, it can also perform printing of a diagonal line pattern and a curved pattern with respect to a horizontal hook part. By using such painting and printing in combination, a sense of unity of the entire laminated material is born, and it is possible to make the adhesive part of the horizontal hook part and the shift of wood grain inconspicuous.

  In the laminated wood manufacturing method of the present invention, as shown in FIG. 6, first, the flitch material 1 is subjected to high-temperature steam treatment, and the flitch material 1-1 having a reduced color difference is used as the laminated material 11. By using the laminated material 11-1 to which the shading is imparted or the laminated material 11-2 in which a curved pattern is printed on the lateral hook portion, it is possible to produce an unprecedented sense of unity as the laminated material, and further impart light resistance. be able to. In addition, although said embodiment demonstrated the form which paints or prints on the surface of a laminated material, you may make it slice and paint and print on the surface of the obtained slice veneer. .

  EXAMPLES Hereinafter, although an Example demonstrates this invention further in detail, this invention is not limited to these Examples at all.

<Raw material wood>
As the raw material wood, 20 pieces of birch flitch material (size: thickness 43 mm × width 115 mm × length 660 mm) were used. In addition, as the flitch material of these hippopotamus, a piece having red and white thickness in one piece was used.

<High temperature steam treatment>
As shown in FIG. 2, the flitch material 1 as a raw material wood was loaded in a frame and high-temperature steam treatment was performed using the high-pressure and high-temperature steam kettle 20 shown in FIG. 1. The conditions for the high temperature steam treatment were a treatment temperature of 140 ° C., a treatment time of 2 hours, and a treatment pressure of 0.26 MPa.

<Measurement of surface color>
At this stage, the surface color of the flitch material before the high-temperature steam treatment and the surface color of the flitch material after the high-temperature steam treatment were measured. As for the surface color, L ^* a ^* b ^* is measured according to JIS Z 8105: 2000 (No. 2070) using a simple spectral color difference meter NF333 manufactured by Nippon Denshoku Industries Co., Ltd., and the standard deviation (color variation) of each is measured. Asked.

  Table 1 shows the results of the surface color of the flitch material before the high temperature steam treatment, and Table 2 shows the results of the surface color of the flitch material after the high temperature steam treatment.

  From this result, it was confirmed that the standard deviation was more than halved before and after the treatment, and the color variation was reduced.

(Reference example)
20 flitch materials that have been subjected to high-temperature steam treatment are assembled using a wet-curing urethane adhesive and then subjected to surface canna finishing and clear urethane coating to produce a laminated material as a reference example. .
Example 1
In the application of the laminated material of the reference example, the one with a light and shaded coating was designated as Example 1.
(Example 2)
In the coating of the laminated material of the reference example, a curved pattern is printed on the side hook portion as Example 2.
(Comparative example)
For the flitch material used in the examples, a high-temperature steam treatment was not performed, and a laminated material was uniformly coated with a dark-colored paint on a laminated material as a comparative example.

<Evaluation>
About the laminated material of a reference example, Example 1, 2 and a comparative example, evaluation was performed about the evaluation item of a graininess, a color sense of unity, a horizontal peeling surface relaxation degree, and light resistance.
With respect to the evaluation of the graininess, the sense of unity of color, and the degree of relaxation of the lateral hull surface, the evaluation was made in four levels by visual observation: very good: 、, good: 、, bad: △, very bad: ×.
As for light resistance, according to JIS L 0843 using a xenon weather meter manufactured by Suga Test Instruments Co., Ltd., the surface condition after irradiation for 48 hours was visually very good: ◎, good: ○, bad: △, very bad: × Evaluation was performed in four stages (the result of evaluation was bad: Δ, very bad: there was no x).
Moreover, comprehensive evaluation was performed from these evaluation results. The results are shown in Table 3.

<Evaluation results>
Examples 1 and 2 were superior to the comparative example for all evaluation items. Further, when the reference example and the examples 1 and 2 were compared, the examples 1 and 2 were superior to the reference examples with respect to the degree of relaxation on the side surface, light resistance and comprehensive evaluation.
From these results, it was confirmed that the application of the present invention with shading and the printing of the curved pattern on the horizontal hooks exerted excellent effects in the sense of unity and light resistance of the laminated material.

DESCRIPTION OF SYMBOLS 1 Flitch material 1-1 Flitch material with reduced color difference 11 Glued material 11-1 Glued material with shading 11-2 Glued material printed with curved pattern 20 High-pressure and high-temperature steam kettle 21 Steam kettle body 22 Opening and closing lid 23 Steam feed pipe 23a Steam supply valve 24 Pressurized water supply pipe 24a Pressurized water supply valve 25 Pressurized air supply pipe 25a Pressurized air supply valve 26 Exhaust pipe 26a Exhaust valve 27 Drain pipe 27a Drain valve 3 High temperature steam 4 Pressurized water 5 Pressurized air 6 Crosspiece 7 Lift Preventive means 8 Placement plate

Claims (5)

A method of manufacturing a laminated wood made by bonding flitch material, wherein the flitch material colored with a high temperature steam treatment, after adhering to a different paint color density on the surface, between the flitch material adjacent horizontal gore portions have rows paint color density changes astride a method for producing a laminated wood, which comprises inconspicuous the displacement of the linear and grain of the transverse gore portion. The method for producing a laminated material according to claim 1, wherein a pattern for making the adhesive portion inconspicuous is printed on the surface of the lateral hook portion after painting with different color densities. A method for producing a laminated material obtained by bonding a flitch material, wherein the flitch material is colored by high-temperature steam treatment and bonded, and then a pattern for making the bonded portion inconspicuous is printed on the surface of the horizontal hook portion A method for producing laminated timber characterized by The method for producing a laminated material according to any one of claims 1 to 3, wherein the high-temperature steam treatment is performed at a treatment temperature of 100 to 160 ° C and a treatment time of 0.5 to 5 hours. A laminated material manufactured by the method for manufacturing a laminated material according to any one of claims 1 to 4.

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