JP2008036954A - Manufacturing process of compressed single wood board - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a manufacturing process of a compressed single wood board by which compressive deformation of the board is firmly fixed by the use of high pressure steam and yet swelling or cracking on the surface of the board is avoided and a compressed wood board being excellent in properties relative to the surface and bending is efficiently and inexpensively manufactured. <P>SOLUTION: The manufacturing process of the compressed wood single board comprises holding the wood board in a hermetically sealable container, subjecting the wood board to a heat and compression treatment in the sealed container, to prepare a compressed wood board with a fixed compressive deformation. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a method for producing a consolidated veneer.

  Conventionally, for the purpose of improving bending strength, improving surface properties, and the like, a wood material is subjected to consolidation treatment. When this consolidation treatment is performed in an open system using a flat press or a roll press, the original shape is restored when moisture or heat acts on the consolidated wood. On the other hand, when the consolidation process is performed in a closed system, the compression deformation can be permanently fixed.

  As a consolidation process in a closed system, for example, in Patent Document 1, after storing a wooden material to be processed inside a pressure-resistant and heat-resistant container that can be sealed, by heating the rigid container in a sealed state, After consolidation of the wood material, a method is described in which cooling water is supplied to the hot plate in a state where the press is maintained, and the consolidated wood is cooled and taken out, and Patent Document 2 is similar to the above. Describes a method for reducing the pressure in a sealed space while maintaining a pressed state after the wood is compressed while being compressed in the sealed space. These methods are methods for permanently fixing deformation by hydrothermally treating wood by steaming the moisture contained in the wood and bringing the inside of the sealed container into a high temperature and high pressure state. Since consolidation can be performed in time, this is an effective method for consolidation. In addition, Patent Documents 3 and 4 also describe a consolidation process in a closed system.

  Further, although not a closed system, Non-Patent Document 1 describes a method of obtaining a consolidated single plate by compressing a wood material sandwiched between breathable metal plates while heating. .

JP 7-47511 A JP-A-8-90516 JP-A-6-238615 JP 2000-238015 A Eiji Udaka, Satoshi Yoshino, “Application of Breathable Metal Plate to Heat Compression Process of Cedar Single Plate”, Wood Industry, Japan Wood Processing Technology Association, October 1, 2003, Vol. 58, No. 10 , P452-456

  In the consolidation process in the conventional closed system, if the sealed container is opened immediately after the sealed heat treatment, the high-temperature and high-pressure steam contained in the wood is released in an instant, and a bulge called puncture occurs. There is a problem that it is easy. In particular, when a raw veneer is used, the thickness is thin and the moisture content is high, so that many cracks are generated on the surface and become separated.

Patent Document 1 describes cooling in a pressed state in order to prevent the release of high-pressure water vapor, but this results in extremely low productivity and greatly increases costs.
Patent Document 2 describes that a closed vessel is provided with an exhaust pipe, and high-pressure steam is discharged from the exhaust pipe in a state where the press is maintained to reduce the pressure in the sealed space. High-pressure steam remains inside, and cracking due to this cannot be prevented.
Since the method of Non-Patent Document 1 is a consolidation process in an unsealed system, compression deformation cannot be sufficiently fixed in a short time.

  By the way, in recent years, in the construction of houses, floor panel construction methods that do not use joists are increasing due to rationalization of construction, and thick coniferous plywood structures are used for floor panels. The veneer for structural use is made of veneer made from strong natural forests such as Russian larch. However, as natural wood resources are depleted, it is important to continue to use them in terms of environment and stock. Therefore, the use of planted trees with abundant accumulation is desired. Among these afforestation trees, afforestation trees such as Falcata, poplar, and cedar are limited in their applications because of their low specific gravity and softness, and therefore it is desired to expand their use by developing applications.

  In addition, the use of scratch-resistant flooring, which is difficult to be damaged when objects are dropped or furniture is dragged, is increasing in residential flooring. This flooring is a plywood made of natural wood hardwood (hard) veneer, and a wood material made by thinly cutting medium density fiberboard (MDF) or hardboard (HDF) to increase the surface hardness. A structure having a veneer on the surface is common. In such scratch-resistant flooring as well as structural plywood, natural wood hardwood is used to increase the strength of the plywood substrate, so an alternative material using afforested wood is also desired. ing.

  Accordingly, an object of the present invention is to provide a compacted veneer with a good surface state by which the compression deformation state of the veneer can be sufficiently fixed by the consolidation system of the closed system, and the surface is prevented from being uneven and cracked. It is an object of the present invention to provide a method for producing a consolidated veneer that can be produced efficiently and economically.

  The present invention is a method for producing a consolidated veneer in which a veneer is housed in a sealable container and the veneer is heat-compressed in a state where the vessel is sealed. The object is achieved by providing a method for producing a compacted veneer characterized in that the heat compression treatment is performed after the moisture content non-uniformity reduction treatment (hereinafter referred to as the first invention). This refers to this invention).

  The present invention also relates to a method for producing a consolidated veneer in which a veneer is accommodated in a sealable container, and the veneer is heat-compressed in a state where the vessel is sealed. A method for producing a compacted veneer, characterized in that, after drying with a hot air circulation dryer until the water content is 50% or more and 100% or less, the heat compression treatment is performed. Thus, the above object has been achieved (hereinafter referred to as the second invention refers to this invention).

  According to the method for producing a consolidated veneer of the present invention, the compression deformation state of the veneer can be sufficiently fixed by the consolidation process of the closed system, and the surface state is prevented from being uneven and cracked. A good compacted veneer can be produced efficiently and economically.

Hereinafter, the present invention will be described in detail based on preferred embodiments thereof.
In the present invention (first and second inventions), a single plate is heated while being compressed to produce a consolidated single plate. A raw veneer is used as a raw material used for manufacturing a consolidated veneer. Here, the raw veneer refers to a veneer that has been cut to a thickness of several millimeters to several tens of millimeters by a rotary lace (veneer lace) while the raw wood is wet.

In the first invention, the raw veneer is subjected to a treatment for reducing the moisture content unevenness, and then the heated veneer is subjected to a heat compression process in a closed system.
Although there are many cases where the moisture content is uneven (variation) in one green veneer, the surface that is free from unevenness and cracking can be prevented by reducing the moisture content unevenness to prevent swelling and warping after the compaction treatment. A consolidated veneer in good condition can be obtained efficiently.

  The treatment for reducing the moisture content unevenness is not limited as long as the moisture content unevenness can be reduced, but (a) water immersion treatment or (b) drying and subsequent water immersion treatment is preferable.

(A) Underwater immersion treatment The underwater immersion treatment is a treatment in which the raw veneer is immersed in water, but it is a treatment in which water is sufficiently brought into contact with the entire raw veneer to such an extent that it can be regarded as being immersed in water. There may be. In the present specification, water includes warm water.
The water used for the water immersion treatment may be room temperature water having a temperature of about 10 to 35 ° C. or warm water.

The treatment time of the water immersion treatment is preferably at least 10 minutes, more preferably 30 minutes or more, and even more preferably 3 hours or more when water at room temperature having a temperature of about 10 to 35 ° C. is used. .
It is preferable to use warm water for the underwater immersion treatment. The temperature of the hot water can be, for example, 40 to 100 ° C., but the use of hot water of 50 ° C. or higher, particularly hot water of 60 ° C. or higher, particularly hot water of 70 ° C. or higher shortens the treatment time and improves the surface condition. From the viewpoint of obtaining a compacted single plate. The upper limit of the preferable temperature of warm water becomes like this. Preferably it is about 100 degreeC, More preferably, it is less than 95 degreeC. By using hot water of 100 ° C. or less, it can be carried out at a low cost with simple equipment.

The water content of the veneer after the immersion treatment in water is preferably 50 to 130%, more preferably 70 to 120%, and particularly preferably 70 to 100% from the viewpoint of obtaining a consolidated veneer having a good surface state. preferable.
In addition, the moisture content of a single board is calculated | required by the following formula.
Moisture content (%) = (W ₁ −W ₂ ) / W ₂ × 100
(W ₁ : Weight before drying (g), W ₂ : Total dry weight (g)
Total dry weight: weight when dried at 100-105 ° C. in a dryer and found to have reached a constant weight)

(B) Drying of raw veneer and subsequent immersion in water Drying of raw veneer is a process for once reducing the moisture content.
The drying method is not particularly limited. For example, the drying method can be left in a drying apparatus capable of maintaining a constant temperature and humidity for drying. Examples of drying conditions include a temperature of 20 to 40 ° C., a relative humidity of 60 to 90%, and a standing time under the conditions of 12 to 48 hours.
This drying is preferably performed until the moisture content of the veneer is 50% or less, particularly 10 to 20%.

The underwater immersion treatment after drying can be performed in the same manner as in the above-mentioned “(a) underwater immersion treatment”.
In the case of the water immersion treatment after drying, a compacted veneer with a sufficiently good surface state can be obtained even with room temperature water, so that the temperature is less than 50 ° C., especially the temperature is about 10 to 35 ° C. It is preferable to use water at room temperature from the point of carrying out with simple equipment at low cost.
Moreover, it is preferable from the viewpoint of obtaining a compacted veneer having a good surface condition that the moisture content of the veneer after the immersion treatment in water is 50 to 120%, particularly 70 to 100%.

  In the second invention, the raw veneer is dried with a hot air circulation dryer until the water content becomes 50% or more and 100% or less, and then heated and compressed in a closed system against the dried veneer. Process. In the second invention, the veneer and warpage after the consolidation treatment are prevented by drying the veneer before being subjected to the heat compression treatment in a closed system, and the compacted single unit having a good surface condition free from irregularities and cracks. A board is obtained efficiently.

The hot air circulation type dryer used in the second invention is one in which warm air flows around the green veneer and the entire surface of the green veneer can be heated substantially uniformly. The hot air circulation type dryer includes a raw veneer housing space or a space through which the raw veneer passes, a heater, and a fan that can circulate hot air heated thereby, Those that can warm the entire surface of the green veneer substantially uniformly by circulating warm air around them are preferably used.
The temperature of the warm air in the second invention is preferably 40 to 180 ° C, from the viewpoint of shortening the drying time, preferably 100 to 180 ° C, and more preferably 140 to 160 ° C. Although the drying time in 2nd invention can be suitably determined by relationship with the temperature of warm air, it is preferable that it is 10 to 60 minutes, especially 20 to 40 minutes.
In the second invention, the green veneer is dried until the moisture content becomes 50% or more and 100% or less. Preferably, it is dried until the water content becomes 60 to 80%.
When the moisture content is dried to 50% or less, in order to generate a sufficient amount of water vapor during the heat compression treatment, a treatment for increasing the moisture content, for example, a treatment similar to the underwater immersion treatment in the first invention is required. . In the second invention, by drying until the moisture content becomes 100% or less, the high moisture content portion disappears, thereby reducing the surface defects of the consolidated veneer.

In the present invention (first and second inventions), even if a raw veneer obtained from low specific gravity soft wood is used, a consolidated veneer having a small thickness and a large bending strength and bending Young's modulus can be obtained. The low specific gravity soft wood can be used for the production of structural wood materials such as plywood and LVL, and surface materials for flooring materials.
A low specific gravity soft wood veneer has a specific gravity of 0.2 to 0.5. Moreover, the low specific gravity soft wood veneer preferably has a specific gravity of 0.25 to 0.45, for example, Falcata (specific gravity 0.30), radiata pine (specific gravity 0.43). ), Chinese poplar (specific gravity 0.35), cedar (cryptomeria japonica) (specific gravity 0.38), and the like.
As a raw veneer, that whose thickness is 1-15 mm, for example can be used, More preferably, it is 1-7 mm.

The veneer that has been subjected to the pretreatment described above is housed in a hermetically sealable container and subjected to a heat compression process in a sealed state.
The veneer is preferably compressed to a compression rate of about 30 to 70%, particularly to a compression rate of about 30 to 50%. For example, when the use of the consolidated veneer is considered as a surface veneer of a front plate and a back plate of a plywood and a floor base plate, the thickness of the consolidated veneer is 0.5 to 2.0 mm. The compression ratio is preferably 30 to 70%, and the thickness before consolidation is preferably 1 to 7 mm.
A compression rate is calculated | required by a following formula.
Compression rate (%) = (Thickness before compression (mm) −Thickness after compression (mm)) / Thickness before compression (mm) × 100
(However, the thickness after compression is the thickness after being taken out of the container and cooled after being heated and pressurized.)

  As a container that can be sealed, a container that can accommodate a single plate and can be sealed in that state can be widely used. As such a container, various well-known things can be used, for example, the container used by patent document 1 can also be used.

FIG.1 and FIG.2 is a figure which shows the compacting jig | tool 10 as a preferable example of the container which can be sealed. A compacting jig 10 shown in FIGS. 1 and 2 includes a lower mold 11 having a rectangular parallelepiped concave portion 11a in plan view, and an upper mold 12 capable of hermetically sealing the opening of the concave portion 11a. At the center of the lower surface of the upper die 12, a convex portion 12a having a shape substantially coincident with the shape of the opening of the concave portion 11a of the lower die 11 is formed, and the lower die 11 is heat-resistant so as to surround the concave portion 11a. An O-ring 13 made of a conductive silicon resin or the like is provided.
And the sealed space is formed inside by combining the lower mold | type 11 and the upper mold | type 12 so that the convex part 12a may be fitted to the opening part of the recessed part 11a.
An exhaust valve (leak valve) 14 for discharging high-pressure steam in the sealed space is provided at the lower part of the lower mold 11.

In a preferred embodiment of the present invention, as shown in FIG. 1, in a state where the veneer 1 is subjected to the above-described pretreatment on a raw veneer, and sandwiched between a pair of tatami woven wire meshes 2 and 3, Store in a sealable container.
A tatami weave wire mesh is a wire mesh with a tatami surface weaving that uses a thick line for the vertical lines and a gap between the horizontal lines until the lines touch each other. There are two types of weave, twill.
A flat woven wire mesh is a wire mesh woven by alternating vertical and horizontal lines, and is not a flat mesh like the commonly used plain weave wire mesh, but a space created by vertical and horizontal lines. Since the particles pass through, it is a wire mesh suitable for liquid and air filtration and dehydration. In addition, since a thick wire diameter is used, the strength of the wire mesh is high and the durability under high pressure is excellent.
The twill woven wire mesh is a twill weave woven wire mesh that weaves two or more vertical lines and horizontal lines, and can be finely woven using a thicker wire diameter than a plain woven wire mesh. It is a dense and strong wire mesh for separation.
Plain woven wire mesh (non-tatami woven wire mesh) has no effect of using the wire mesh because the wire mesh is difficult to insert on a single plate. Therefore, the wire mesh used in the present invention is a tatami-woven wire mesh that is highly durable at high temperature and high pressure. It is desirable to use a twilled woven wire mesh having a fine mesh and high durability in order to make it difficult to transfer the mesh of the wire mesh to the consolidated veneer.
FIG. 3 shows an example of a plain woven wire mesh, and FIG. 4 shows an example of a twill woven wire mesh.

The mesh of the tatami woven wire mesh is preferably 200 to 500 mesh. When the mesh is small (the mesh opening is large), the mesh is conspicuous on the surface of the compacted single plate, and when the mesh is large (the mesh is small), the wire mesh surface is easily soiled.
When two plain woven wire meshes are used in an overlapping manner, the durability of the wire mesh is low and the surface of the consolidated single plate is likely to have a mesh.

A method of manufacturing a consolidated single plate using the above-described compacting jig 10 will be described with reference to FIGS.
(Preparation process)
First, the veneer 1 that has been subjected to the pretreatment as described above is set in a compacting jig 10 while being sandwiched between a pair of tatami wire meshes 2 and 3, as shown in FIG. The consolidation jig 10 is attached to a pressure device having a heating means, for example, a hot press (not shown). Specifically, the upper mold 12 is fixed to the upper board of the hot press, and the lower mold 11 is fixed to the lower board. The compacting jig 10 is heated by hot pressing, and the heating temperature of the single plate is adjusted by hot pressing. The thickness of the consolidated single plate is adjusted by installing a spacer (metal plate) 15 at the bottom of the lower mold recess.

(First pressing process)
The upper plate of the press is lowered until the upper die of the compacting jig 10 is in contact with the tatami woven wire mesh 2, and the single plate 1 is heated for 5 to 15 seconds. This heating can soften the wood to some extent. It is desirable that the water inside the veneer is vaporized and slightly leaks from the compacting jig. If the time is short, softening may be insufficient and sealing may be insufficient, or the veneer may be crushed. In addition, if the time is long, the moisture inside the veneer evaporates, and the compression deformation is insufficiently fixed.

(Second pressing process)
By compressing the O-ring 13 by bringing the upper die and the lower die into close contact with each other, the inside of the consolidation jig 10 is sealed. In this state, pressure and heat from the hot press are applied to the laminate of the veneer 1 and the tatami woven wire meshes 2 and 3, and the moisture in the wood is vaporized to generate water vapor. The internal pressure of the compacting jig 10 is increased, and steam treatment is performed. Thereby, the veneer 1 is compressed, and the compression deformation state is permanently fixed.
The press pressure by a pressurizing mechanism such as a hot press is preferably 2.9 to 4.9 N / mm, and the heating temperature is preferably 180 to 220 ° C, particularly preferably 200 to 220 ° C. The heating time depends on the heating temperature, but is preferably 120 seconds to 10 minutes, and more preferably 60 seconds to 5 minutes.

(Decompression step)
The leak valve 14 is opened in a heat-pressed state, high-pressure steam inside the sealing jig is discharged, and the inside of the sealing jig is reduced to atmospheric pressure.
(Drying process)
The heat-pressed state is maintained for about 1 to 2 minutes and the compacted veneer is dried.
(Cooling process)
After opening the sealed container and taking out the compacted veneer, the consolidated veneer is cooled with a cold press. This cooling step is preferably performed because the blown and wavy portions of the consolidated single plate are reduced.

In this way, by being consolidated, it is possible to obtain a consolidated single plate having a reduced thickness and an improved bending strength and Young's modulus.
In the above-described method, the compacting jig 10 (container) is heated by the heating means of the pressurizing device, but the lower mold or the upper mold itself may be provided with a heating means, The lower mold and / or the upper mold of the consolidation jig 10 may be made inseparable from the upper plate or the lower plate of the pressurizing means. Further, instead of installing the spacer 15 at the bottom of the concave portion of the lower mold, the compression ratio and the thickness of the consolidated single plate can be adjusted by replacing the lower mold with a different depth of the concave portion.

  The consolidated veneer obtained by the present invention can be used as, for example, a veneer or a veneer constituting an LVL. When used as a single plate constituting a plywood or LVL, the consolidated single plate may be any of the front material, the back material, the core material and the top core plate of the plywood, and all the single plates are constituted by the consolidated single plate. Alternatively, some of the single plates may be composed of consolidated single plates. Since the compacted single plate obtained in the present invention has good surface properties, it is preferably used as a single plate constituting a plywood or an LVL surface material and / or a backing material. Moreover, it is also preferable to use a consolidated single board group as a single board which comprises the surface material and backing material of a plywood, and a single board which comprises another layer.

  The manufacturing method of the consolidated single plate of this invention is not restrict | limited to embodiment mentioned above, It can change suitably. For example, the veneer after the moisture content non-uniformity reduction process in the first invention and the veneer after the drying process in the second invention are not patented, instead of performing a heat compression process sandwiched between a pair of tatami woven wire meshes. The heat compression treatment can also be performed by sandwiching between a gas-permeable metal plate described in Document 1 or a metal plate on which many fine grooves for releasing water vapor are formed.

Next, the present invention will be specifically described based on examples and comparative examples, but the present invention is not limited to the following examples.
(Example 1)
A raw veneer (350 mm × 350 mm × 2.65 mm, moisture content 85%) having a square shape in plan view obtained from Falcarta was subjected to a water immersion treatment as a treatment for reducing moisture content unevenness. Specifically, the green veneer was immersed in water at a temperature of 25 ° C. for 3 hours. The veneer taken out of the water after the treatment for 3 hours leaned against the wall and left for about 10 minutes to drain the water. The moisture content of the veneer at this time was 120%.
The veneer woven wire mesh (mesh 250μ, opening 85μ, porosity 30%, shape and dimensions in plan view are the same as the veneer, both sides of the veneer) Used the same wire mesh).
Then, the single plate sandwiched between the two metal meshes is disposed in the recess 11a (inner dimensions 500 mm × 500 mm) in the compacting jig 10 having the above-described configuration, and in the same manner as the preferable compacting process described above, In a state where the compacting jig 10 was sealed, the laminated body of the single plate and the tatami mat woven wire mesh was heated while being compressed, and then decompressed, dried and cooled to obtain a consolidated single plate. Immediately after the pressure was reduced to atmospheric pressure, the press was released.
The heating temperature and heating time in the first pressing process were 200 ° C. and 10 seconds, and the heating temperature and heating time in the second pressing process were 200 ° C. and 180 seconds. The pressing pressure in the first pressing step was 0.05 N / mm ² and the pressing pressure in the second pressing step was 3.9 N / mm ² .
The cooling step was performed at intervals of 60 seconds at a room temperature (10 ° C. to 20 ° C.) and a press pressure of 1.0 N / mm ² . The compression rate was 50%.

(Example 2)
A consolidated veneer was obtained in the same manner as in Example 1 except that the raw veneer was immersed in warm water at a temperature of 70 ° C. for 30 minutes as an immersion treatment in water. The water content of the veneer was 90% when it was taken out from hot water at 70 ° C., leaned on the wall and left for about 2 to 3 minutes to drain the water.

(Example 3)
A compacted veneer was obtained in the same manner as in Example 1 except that the raw veneer was dried and then immersed in water under the following conditions as a treatment for reducing the moisture content unevenness.
Drying: standing in a constant temperature and humidity machine (Tabane Espec constant temperature and humidity machine) set at a temperature of 30 ° C. and a relative humidity of 90% for 24 hours, and the moisture content after drying is 10 to 20%.
Immersion treatment in water: immersion in water at a temperature of 25 ° C. for 3 hours, water content 70% after immersion treatment

Example 4
The same raw veneer used in Example 1 was housed in a hot air circulation dryer (Perfect Oven manufactured by Tabai Espec) and dried at a hot air temperature of 40 ° C. for 1 hour. The moisture content after drying was 70%.
The dried veneer was sandwiched between twilled woven wire nets similar to those in Example 1, and subjected to heat compression treatment under the same conditions as in Example 1.

(Comparative Example 1)
The same raw veneer as used in Example 1 was subjected to heat compression treatment in the same manner as in Example 1 except that the immersion in water was not performed.

[Evaluation]
(Confirmation of permanent fixation)
The obtained consolidated veneer was recovered by the following method in order to confirm whether the compression deformation state was fixed or not. The results are shown in Table 1.
(Recovery level calculation method)
A test piece (50 mm × 50 mm) obtained from the consolidated veneer was dried at 105 ° C. for 24 hours, the thickness of the test piece after complete drying was measured, and the thickness was defined as the thickness L _C before recovery.
The test piece was immersed in warm water at 70 ° C. for 2 hours.
The test piece after immersion in warm water was dried at 105 ° C. for 24 hours, the thickness of the test piece after complete drying was measured, and the thickness was defined as the thickness L _R after recovery.
The degree of recovery was calculated from the following equation.
Recovery degree (%) = (L _R −L _C ) / (L ₀ −L _C ) × 100
L ₀ : thickness before consolidation (same as the thickness of raw veneer), L _C : thickness before recovery, L _R : thickness after recovery

(Evaluation of surface properties)
(Evaluation)
The number of compacted single plates shown in Table 2 was manufactured by the methods of Examples and Comparative Examples, and the respective surface states were visually observed. The results are shown in Table 2.

Evaluation criteria for surface condition ○: No defect (no minor irregularities and irregularities harmful to use, no cracks)
Δ: Thickness defect due to slight unevenness ×: Cracking or unevenness that is harmful in use.

  From the results shown in Table 1, it can be seen that the consolidated veneer obtained by the method of the example has a degree of recovery of less than 5% and the compression deformation state is sufficiently fixed.

  From the results shown in Table 2, the surface state of the consolidated veneer obtained by performing the moisture content non-uniformity reduction treatment in the first invention and the preliminary drying treatment in the second invention before the heat compression treatment for sealing is obtained. It can be seen that it can be greatly improved.

It is sectional drawing which shows a mode that a veneer is accommodated in the container which can be sealed in the state pinched | interposed between a pair of tatami mats. It is sectional drawing which shows a mode that a heat compression process is performed with respect to the single plate of the state pinched | interposed into the tatami-woven wire mesh in the airtight container, and is a figure which shows the cross section corresponding to FIG. It is a figure which shows an example of a flat woven wire mesh, (a) is a top view which expands and shows a part, (b) is the figure which looked at (a) from the side, (c) These are the figures which looked at (a) from the downward direction. It is a figure which shows an example of a wire mesh of a twill weave, (a) is a top view which expands and shows a part, (b) is the figure which looked at (a) from the side, (c), It is the figure which looked at (a) from the lower part.

Explanation of symbols

1 Single plate 2, 3 tatami woven wire mesh 10 Consolidation jig (containable container)
11 Lower mold 11 Recess 12 Upper mold 20 Plywood

Claims (5)

In a method for producing a compacted veneer that houses a veneer in a sealable container and performs heat compression treatment on the veneer in a state where the vessel is sealed,
A method for producing a consolidated veneer, wherein the green veneer is subjected to a treatment for reducing moisture content unevenness and then the heat compression treatment.   The method for producing a consolidated veneer according to claim 1, wherein the treatment for reducing the moisture content unevenness is an underwater immersion treatment.   The method for producing a consolidated veneer according to claim 2, wherein the water immersion treatment is a hot water immersion treatment in which a raw veneer is immersed in warm water having a temperature of 50 ° C or higher.   The method for producing a consolidated veneer according to claim 1, wherein the treatment for reducing the moisture content unevenness is drying and a subsequent immersion in water. In a method for producing a compacted veneer that houses a veneer in a sealable container and performs heat compression treatment on the veneer in a state where the vessel is sealed,
A method for producing a compacted veneer, characterized in that the green veneer is dried with a hot air circulation dryer until the water content is 50% or more and 100% or less, and then the heat compression treatment is performed. .

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