JP5754836B2 - Method for producing consolidated wood, consolidated wood and decorative board - Google Patents

Description

The present invention relates to a method for producing consolidated wood having a knot , a consolidated wood, and a decorative board having a decorative veneer formed of the consolidated wood.

  For example, conifers as substitutes for hardwoods are generally softer than hardwoods, and for use as building or furniture materials, surface properties such as surface hardness and surface wear resistance, moisture and heat resistance. Since there is a problem in durability and strength, etc., soft wood such as conifers is softened by steam treatment to improve surface characteristics, durability and strength, and then a flat press A so-called consolidation process is performed in which the film is heat-pressed to be consolidated to a thickness of about 20 to 70% of the initial thickness.

  Specifically, the following method is adopted by a method of fixing the consolidated wood so that it does not return to its original state. 1) Put the wood in the oven in a state where the wood is compressed by a flat plate press and heat-treat it at 180 ° C. for about 16 to 24 hours. 2) In the autoclave with the wood compressed by a flat plate press. 3) Place the wood to be treated between the hot platens of a flat plate press with a hot platen, and treat it with elastic silicon material around it. After placing the elastic sealing material and the required thickness regulating jig such as stainless steel around it, the wood is hot-pressed with a hot platen, and the water content of the wood itself is converted into high-pressure steam, and the same high pressure as in 2) A so-called hermetic consolidation process or the like that performs steam treatment is employed.

Japanese Patent No. 3063368

However, in the case of wood having nodes, when the above-described consolidation treatment is performed,
1) Since the joints cannot be fully consolidated, the surface of the joints will be swollen and not smooth 2) Cracks and cracks will occur in the joints 3) Resin such as smelt elution from the joints will be flat press It becomes difficult to remove the compacted wood from the hot platen. 4) The joint becomes dark brown and the design is lost. 5) The surface of the hot platen of the flat plate press machine is recessed when it is compacted. Therefore, the wood that can be actually consolidated is limited to wood that has no nodes or very small ones, resulting in poor yields and high material costs. I was on.

  Accordingly, an object of the present invention is to provide a method for producing a consolidated wood that can be consolidated even if there is a node, a consolidated wood having a node, and a decorative board in which a decorative veneer is formed from such consolidated wood. It is to provide.

In order to solve the above-mentioned problem, the invention according to claim 1 is a method for manufacturing a consolidated wood having a knot , using a wood whose knot is not exposed on the back side, and on the back side of the wood. After forming a recess with a predetermined depth slightly larger than the node on the back side of the wood without cutting the node so as to surround the unexposed node, the wood was compacted A method for producing a compacted wood characterized by the above is provided. The invention according to claim 2 is a method for manufacturing a consolidated wood having a node, and has a predetermined depth that is slightly larger than the node so as to surround the node and completely cut out. After the recess is formed, the wood is compacted . Here, the “back side of wood” means a side that is not used as a decorative surface, and may be either the front side or the back side of the wood. As for the consolidation process, any conventionally performed method such as a sealed consolidation process, an open consolidation process, or a roll consolidation process may be employed.

  The method for producing consolidated wood according to the present invention is effective when the wood is consolidated to about 1/2 to 1/3 of the original thickness, and the depth of the recess formed on the back side of the wood is the same as before consolidation. It is desirable to set to about 1/3 to 2/3 of the thickness of the wood.

  Further, the planar shape of the concave portion is not particularly limited, such as a circular shape, an elliptical shape, a rectangular shape, or a rectangular shape, and the planar size of the concave portion is not particularly limited as long as it is a size that surrounds the node portion. However, if the planar size of the recesses is made larger than necessary, the area of insufficient strength (insufficient density) will increase, and it may not be possible to ensure the required strength as a whole wood. It is desirable to set a large value (2.5 mm on one side and about 5 mm on both sides).

In order to solve the above problems, invention according to claim 3, claim 1 or is to provide a compaction process timber manufactured by the manufacturing method of the invention according to 2.

The invention according to claim 4 provides a decorative board obtained by sticking a decorative veneer formed of the compacted wood of the invention according to claim 3 to a base material. Examples of the substrate include plywood, particle board, oriented strand board, other medium fiber boards, and hard fiber boards.

As described above, in the method for manufacturing the consolidated timber of the inventions according to claims 1 and 2 , the predetermined depth that is slightly larger than the node is formed on the back surface side of the timber so as to surround the node before the consolidation process. When the compaction process is performed, the node is hardly compressed or even if it is compressed, the compression rate is small. By performing the consolidation process, 1) the surface of the node is 2) Cracks and cracks occur at the joints, 3) Resin such as leaching from the joints adheres to the hot platen of the flat plate press, and compacted wood can be easily removed from the hot platen. And 4) the joints become dark brown and impair the sense of design. 5) When compacting, the surface of the hot platen of the flat plate press machine is recessed. There is nothing. Therefore, even wood having knots can be consolidated, so that material costs can be reduced and yield can be improved. This is particularly effective when compacting to 1/2 to 1/3 of the original wood thickness.

In the consolidated wood of the invention according to claim 3 manufactured by such a method, a discontinuous part of the grain is formed at a position slightly larger than the node part in the longitudinal section passing through the node part. a boundary discontinuities, knurl side has less number of grain, both the outer knuckles that have been many number of wood grain, on the back surface side, surrounds knuckles, slightly larger than the knuckle discontinuous line is formed, the inside and outside of the discontinuities are in Ino such a continuous identical surface, compaction treated wood having a characteristic structure in which said do this, according to claim 1 or Alternatively, it can be recognized that the wood is a consolidated wood produced by the method of the invention according to 2 .

In addition, the decorative board of the invention according to claim 4 uses a decorative veneer made of compacted wood having knots, which can be manufactured at a low cost, so that wood without knots as in the prior art is used. It can be manufactured at a lower cost than a decorative board formed by sticking a decorative veneer formed from a compacted wood made by compacting only a decorative wood.

(A) is a top view which shows an example of the timber which has a node part, (b) is sectional drawing along the XX line of (a), (c) is the same as the above according to the manufacturing method of the consolidation process wood which concerns on this invention. The top view which shows the state which formed the recessed part in the back surface of the wood of (d), (d) is sectional drawing along the YY line of (c). (A) is a top view which shows the other example of the timber from which the formation state of a node part differs, (b) is sectional drawing along XX of (a), (c) is the consolidation process wood which concerns on this invention The top view which shows the state which formed the recessed part in the back surface of a timber same as the above manufacturing method, (d) is sectional drawing along the YY line of (c). (A) is a top view which shows the other example of the timber from which the formation state of a node part differs, (b) is sectional drawing along XX of (a), (c) is the consolidation process wood which concerns on this invention The top view which shows the state which formed the recessed part in the back surface of a timber same as the above manufacturing method, (d) is sectional drawing along the YY line of (c). (A) is a top view which shows the other example of the timber from which the formation state of a node part differs, (b) is sectional drawing along XX of (a), (c) is the consolidation process wood which concerns on this invention The top view which shows the state which formed the recessed part in the back surface of a timber same as the above manufacturing method, (d) is sectional drawing along the YY line of (c). (A) is a top view which shows the other example of the timber from which the formation state of a node part differs, (b) is sectional drawing along XX of (a), (c) is the consolidation process wood which concerns on this invention The top view which shows the state which formed the recessed part in the back surface of a timber same as the above manufacturing method, (d) is sectional drawing along the YY line of (c). It is a reverse view of the consolidation process wood manufactured by the manufacturing method same as the above. It is a longitudinal cross-sectional view which shows the node part of the consolidation process wood same as the above. (A) is a top view which shows the state which formed the recessed part in the back surface of the timber which has the node part used in Example 1, (b) is a longitudinal cross-sectional view of the node part of the timber same as the above, (c) is the same as the above. The top view which shows the consolidation process wood manufactured from the wood, (d) is a longitudinal cross-sectional view of the node part of the consolidation process wood same as the above. (A) is a top view which shows the state which formed the recessed part in the back surface of the timber which has the node part used in Example 2, (b) is a longitudinal cross-sectional view of the node part of the timber above, (c) is the same as the above. The top view which shows the consolidation process wood manufactured from the wood, (d) is a longitudinal cross-sectional view of the node part of the consolidation process wood same as the above. (A) is a top view which shows the state which formed the recessed part in the back surface of the timber which has the node part used in Example 3, (b) is a longitudinal cross-sectional view of the node part of the same wood, (c) is the same as the above. The top view which shows the consolidation process wood manufactured from the wood, (d) is a longitudinal cross-sectional view of the node part of the consolidation process wood same as the above. (A) is a top view which shows the state which formed the recessed part in the back surface of the timber which has the node part used in Example 4, (b) is a longitudinal cross-sectional view of the node part of the timber same as the above, (c) is the same as the above. The top view which shows the consolidation process wood manufactured from the wood, (d) is a longitudinal cross-sectional view of the node part of the consolidation process wood same as the above. (A) is schematic sectional drawing which shows the state which put the wood which formed the recessed part in the back surface in the sealing hot plate | board heating apparatus, (b) is the state which is carrying out the sealing compaction processing to wood with the sealing hot plate | board heating apparatus same as the above. It is a schematic sectional drawing shown.

  Hereinafter, the manufacturing method of the consolidation process wood of this invention is demonstrated with reference to drawings. The method for producing consolidated wood according to the present invention is effective when the wood is compacted to about 1/2 to 1/3 of its original thickness, and the nodes protrude in a planar manner before the consolidation treatment. In such a state, a concave portion having a depth of about 1/3 to 2/3 of the thickness of the wood before compaction is formed on the back side of the wood. Any conventional method such as consolidation treatment, open consolidation treatment, roll consolidation treatment, etc. may be adopted, and the consolidation and fixing method is not particularly limited.

  For example, as shown in FIGS. 1 (a) and 1 (b) and FIGS. 2 (a) and 2 (b), there is a relatively thin node k on the side of the tree surface f or in the center in the thickness direction. In the case of the woods 1a and 1b using the f side as a decorative surface, as shown in FIGS. 1 (c) and (d) and FIGS. 2 (c) and (d), the node k does not protrude in a plane. In such a state, the concave portion 2 having a depth of about 1/3 to 2/3 of the thickness of the wood 1a, 1b before consolidation, which is one turn larger than the node k (about 2.5 mm on one side and about 5 mm on both sides). Is formed on the back of the tree b, and then a consolidation process is performed.

  In addition, as shown in FIGS. 3A and 3B, in the case of the wood 1c having a large node k from the wood front f side to the wood back b side and using the wood front f side as a decorative surface, As shown in (c) and (d) in the figure, the node k does not protrude in a plan view, and the thickness of the wood 1c before consolidation is reduced to 1 / th in a state where the node k is partially cut in the thickness direction. After forming the concave portion 2 having a depth of about 3 to 2/3 on the tree back b side, a consolidation process is performed. However, in the case of this wood 1c, even when the concave portion 2 is formed, the portion where the concave portion 2 is formed has a node k from the side of the tree surface f to the bottom surface of the concave portion 2. It is desirable to set the depth of the recess 2 as large as possible so as not to compress as much as possible.

  In addition, as shown in FIGS. 4A and 4B, in the case of the wood 1d having a relatively thin node k on the wood back b side and using the wood surface f side as a decorative surface, As shown in FIGS. 2C and 2D, the concave portion 2 is formed on the tree back b side in a state in which the node k is completely removed. Thus, when the recess 2 having a depth of about 1/3 to 2/3 of the thickness of the wood before consolidation is formed, if the node k is completely removed, the depth of the recess 2 is It is not necessary to set such a size, and conversely, considering the strength reduction associated with completely cutting the node k, it is necessary to set the minimum depth at which the node k can be cut. desirable.

  Further, as shown in FIGS. 5 (a) and 5 (b), there are relatively thin nodes k on both the wood surface f side and the wood back b side of the wood, and the wood surface f side is used as a decorative surface. In the case of the wood 1e to be used, as shown in FIGS. 2C and 2D, a plurality of recesses 2 are formed on the tree back b side in a state where the respective nodes k do not protrude in plan view. In this case as well, as described above, the recess 2 that completely cuts the node k is set to a minimum depth at which the node k can be cut. It is desirable to keep it.

  Normally, the wood front side is used as a decorative surface, but if the wood back side is used as a decorative surface, a similar recess may be formed on the wood front side.

  The compacted wood produced by such a method has a large amount of compression other than the concave portion 2, but the concave portion 2 has a small amount of compression or is not compressed at all. As shown in FIG. 6, a discontinuous line 3 formed by a shallow narrow groove shape or a shallow recess surrounding the node k appears so as to correspond to the outline of the recess 2. Since the inside of the discontinuous line 3 is the bottom surface of the recess 2 and the outside of the discontinuous line 3 is the back surface of the wood before consolidation, the inside and outside of the discontinuous line 3 are substantially flush. But they are not the same continuous surface.

  Also, in the consolidated wood produced by the method of the present invention, the longitudinal cross section passing through the node k is located outside the node k so as to correspond to the outer periphery of the recess 2 as shown in FIG. A discontinuous part of the grain is formed, and the number of grain on the node k side is small with this discontinuity as a boundary, but the grain interval is wide, and conversely, the number of grain on the outside of the node k is large. However, the grain spacing is narrow.

  Therefore, whether or not the backside or vertical cross section of the consolidated wood has such a characteristic configuration can be determined as to whether the consolidated wood is manufactured by the method of the present invention.

  Examples of the present invention will be described below, but the present invention is not limited to these examples.

Example 1
As shown in Table 1 and FIGS. 8 (a) and 8 (b), a density of 0.35 g / cm ³ , a moisture content of 20%, having a substantially elliptical node k having a major axis of about 30 mm on the side of the wooden table f, A depth of 3 mm, a long diameter, which is slightly larger than the node k so as to surround the node k in a planar manner on the back surface (wood b side) of the cedar lumber product 1A having a thickness of 9 mm, a width of 100 mm and a length of 2000 mm A substantially elliptical concave portion 2 of about 35 mm is formed, and this is formed into a seal packing having a height of 3 mm attached to the upper heating plate 11, the lower heating plate 12, and the lower heating plate 12, as shown in FIG. It put into the sealed hot platen heating apparatus 10 which has the formwork 13, and hot-pressed by the hotplate temperature of 200 degreeC and the pressurization pressure of 30 kgf / cm < ² >. As shown in FIG. 6B, 10 minutes after the upper heating plate 11 comes into contact with the seal packing mold 13, the hot platen is cooled by passing cooling water through the upper heating plate 11 and the lower heating plate 12. When the temperature reached 80 ° C., the upper heating platen 11 was raised, and a consolidated wood 1Aa having a thickness of 3 mm as shown in FIGS. 8C and 8D was taken out.

(Example 2)
As shown in Table 1 and FIGS. 9 (a) and 9 (b), using the cedar lumber product 1B similar to that of Example 1, except that the node k exists at the center in the thickness direction, A consolidated wood 1Ba as shown in FIGS. 9C and 9D was manufactured in the same manner as in Example 1.

(Example 3)
As shown in Table 1 and FIGS. 10 (a) and 10 (b), it has a substantially elliptical node k having a major axis of about 20 mm on the side of the tree, a density of 0.45 g / cm ³ , a moisture content of 30%, and a thickness. 10 mm wide, 100 mm wide, 2000 mm long timber product 1C on the back (the back side of the tree), so as to surround the node k in a plane, it is slightly larger than the node k, about 5 mm in depth and about 25 mm in major axis A substantially elliptical concave portion 2 is formed, and this is put into a hermetic hot plate heating apparatus 10 in which the height of the seal packing mold 13 is set to 5 mm, and the hot plate temperature is 180 ° C. and the pressurizing pressure is 30 kgf / cm ² . Hot pressed. 15 minutes after the upper heating platen 11 comes into contact with the seal packing form 13, cooling water is passed through the upper heating platen 11 and the lower heating platen 12 to cool the hot platen. The board 11 was raised to take out the consolidated wood 1Ca having a thickness of 5 mm as shown in FIGS. 10 (c) and 10 (d).

Example 4
As shown in Table 1 and FIGS. 11 (a) and 11 (b), except that the node k exists in the center in the thickness direction, the smoked lumber product 1D similar to that of Example 3 is used, A consolidated wood 1Da as shown in FIGS. 11C and 11D was manufactured in the same manner as in Example 3.

(Comparative Example 1)
A consolidated wood was produced in the same manner as in Example 1 without forming a recess in the same cedar lumber product as used in Example 1.

(Comparative Example 2)
A consolidated wood was produced in the same manner as in Example 2 without forming a recess in the same cedar sawn timber used in Example 2.

(Comparative Example 3)
A consolidated wood was produced in the same manner as in Example 3 without forming a recess in the same smoked lumber product as used in Example 3.

(Comparative Example 4)
A consolidated wood was produced in the same manner as in Example 4 without forming a recess in the same smoked lumber product as used in Example 4.

  About each consolidation processing wood obtained in Examples 1-4 and Comparative Examples 1-4 mentioned above, surface smoothness situation, partial crack occurrence situation, crack adhesion occurrence situation, and a feeling of design were checked, and each result is shown in Table 2. It was shown to.

  As can be seen from Table 2, with respect to Examples 1 to 4 in which the consolidation treatment was performed in a state where the concave portion 2 was formed on the back surface so as to surround the node k in a plane, the surface smoothness situation, the partial crack occurrence situation, Although no problem occurred in all of the adhesion occurrence state and the design feeling, in Comparative Examples 1 to 4 in which the compaction treatment was performed without forming the concave portion on the back surface, the surface was convex corresponding to the node k. In addition to the occurrence of blistering, scum adheres to the hot platen, and the design feeling is not preferable. Further, in Comparative Examples 2 and 4 using the cedar lumber product or the smoked lumber product in which the node k exists in the center in the thickness direction, partial cracks also occurred around the node.

  In Examples 1 and 2 where the compression rate is 66.7%, the depth of the recess 2 is set to 1/3 of the plate thickness before consolidation, and in Examples 3 and 4 where the compression rate is 50%, the recess 2 However, the present invention is not limited to this, and considering the compression ratio and the thickness of the node, etc., the depth of the plate is 1/2 of the plate thickness before consolidation. What is necessary is just to set suitably in the range of 3-2 / 3.

  It can be used when a consolidation process is performed on wood having knots.

1a, 1b, 1c, 1d, 1e Wood 1A, 1B Cedar lumber 1C, 1D Firewood lumber 1Aa, 1Ba, 1Ca, 1Da Consolidation treated wood 2 Recess 3 Discontinuous wire 10 Sealed hot platen heating device 11 Upper heating plate 12 Bottom Heating board 13 Seal packing form b Wood back f Wood surface k Node

Claims (4)

A method for producing consolidated wood having a knot,
Use wood with no exposed node on the back side,
After forming a concave part of a predetermined depth that is slightly larger than the node part in the state where the node part is not cut on the back surface side of the wood so as to surround the node part not exposed on the back side of the wood,
A method for producing consolidated wood, wherein the wood has been subjected to consolidation. A method for producing consolidated wood having a knot,
As completely excised enclose take knuckles, on the back side of the timber, after forming the concave portion of the large predetermined depth slightly from the knuckle,
A method for producing consolidated wood, wherein the wood has been subjected to consolidation. A consolidated wood produced by the production method according to claim 1 or 2 . A decorative board obtained by sticking a decorative veneer formed of the compacted wood according to claim 3 to a base material.

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