JPH1071609A - Manufacture of laminated wood - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently produce tough laminated wood by effectively utilizing fine woods by compressing a plurality of heated woods arranged in parallel from four outside directions so as to uniformly disperse pressure and closely bonding the woods by forming the contact surfaces of them as uneven surfaces. SOLUTION: A plurality of woods 30 of which the surfaces are processed into a columnar or prismatic shape or from which the bark is removed are introduced into a primary heating pipe to be hermetically sealed therein and heated by heated and pressurized steam to be fed in the molding chamber of a press machine to be together pressed. The hard parts of the pressed woods 30 protrude and the closely bonded parts thereof become a recessed shape and the woods 30 become a prismatic or plate like shape as a whole. The woods 30 are again heated and pressed by the high frequency power supply of the press machine and compressed into a high density columnar shape to be transferred to a cooling and shape retaining pipe and once held to a high temp. heated state in a heating chamber to be transferred to a cooling means and the glass transition state of the woods is released to fix the woods to a compressed and molded state. Next, the woods 30 are separated and an adhesive is applied to the bonding surfaces of the woods and these woods are gathered in a pressed state and four surfaces of the outer peripheries of the gathered woods are again pressed to cure the adhesive to obtain tough laminated wood.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a laminated wood for bonding a plurality of woods. In the present specification, “laminate wood” is interpreted in a particularly broad sense. In the present specification, `` laminated wood '' means a plurality of woods gathered and bonded,
It is used in a meaning that includes everything formed by forming the entire shape into a columnar or plate shape.

[0002]

2. Description of the Related Art An enormous amount of thinned wood is discarded without being effectively used. One of the reasons that thinned wood is not used effectively is that the density is low and the strength is not enough.
If the thinnings can be made strong enough, their use will increase significantly. For example, as a two-by-four frame material, thinning material such as cedar is hardly used, and peeler and pine pine are used. However, if the thinned material can be processed to a sufficient strength, it can be used for this kind of application. If thinned wood with low density and insufficient strength can be made high density and sufficient strength, it can be effectively used as high quality wood. Not only thinned wood but also low-density wood is not used effectively because its use is limited due to lack of sufficient strength.

[0003] By pressing wood while it is being heated, low-density wood can be made high-density and tough. Wood has annual rings consisting of summer and winter eyes. When wood is heated and compressed, the soft summer eyes are thinly crushed and strengthened. In winter, hard parts have sufficient strength. Natsume is weaker than winter. If Natsume is pressed densely and hardened, the whole wood becomes stronger.

Wood can be pressed to a high density by heating lignin or hemicellulose, which is the main component, to a temperature higher than the glass transition temperature to bring it into a wet state. The glass transition temperature of wood is 130C to 250C in the dry state, but drops to 80C to 250C in the wet state. When wood is heated in the wet state, the glass transition temperature decreases,
It becomes easy to compress.

[0005] Compressed wood becomes denser and tougher. For this reason, the thinned wood can be used as a structural material such as a pillar with sufficient strength, for example. However, when compressed, the wood becomes thinner, so it is necessary to compress using thicker thinned wood. In particular, in order to obtain sufficient strength, it is necessary to compress considerably, so that it is necessary to use thick wood. This means that thin thinned wood cannot be used effectively. As shown in FIG. 1, thin thinned wood can be effectively used as laminated wood 16 by bonding. The laminated wood 16 shown in FIG.
In this method, a thin thinned material 28 is compressed into a tough square material 29, which is bonded and processed into a prismatic shape. This laminated wood 16
Can effectively use thin thinned material 28 as a structural material such as a pillar.

[0006]

As shown in FIG. 1, in order to manufacture the laminated wood 16, as shown in FIG. 1, the thinned wood 28 is heated and compressed into a thin prism, and the thinned wood 28 is bonded to the thin wood 28 to form a prism having a prism shape as a whole. Process into This method has a disadvantage that it takes time and effort to compress the thinned material 28. As the number of square pieces 29 to be bonded as the laminated wood 16 increases, the number of times of compression increases. For example, as shown in FIG. 1, the glued wood 16 to which four square lumbers 29 are bonded needs to be compressed and then bonded together after compressing the thinned wood 28 four times.

Further, as shown in FIG. 1, the method of bonding the pressed wood to the prism to form the glued wood 16 is such that if there is a hard knot or the like on the surface of the wood, the wood is compressed uniformly without difficulty at that portion. Becomes difficult. Since hard parts such as knots are not compressed, the vicinity thereof is forcibly compressed, and the grain may become discontinuous or may be locally destroyed. For this reason,
The strength of the compressed wood can be partially weakened.

[0008] The present invention has been developed for the purpose of further solving this drawback. An important object of the present invention is to produce a tough laminated wood effectively utilizing thin wood, efficiently produce the laminated wood, and furthermore, compress the wood without difficulty and uniformly to form a tough laminated wood as a whole. It is to provide a manufacturing method.

[0009]

According to the present invention, there is provided a method for producing a laminated wood, which comprises the steps of producing a laminated wood in the following manner. The method of manufacturing laminated wood according to the present invention is an improvement of the method of bonding and aligning a plurality of wood pieces in parallel.
Zeros are arranged in parallel and compressed from the four outer directions to reduce the volume and form the entire outer shape into a prismatic or plate shape. The plurality of pieces of wood 30 that are assembled and compressed together are brought into close contact with the contact surfaces of the adjacent woods 30 as uneven surfaces, and the contact surfaces are adhered to form the laminated wood 16. That is, in the method of manufacturing laminated wood according to the present invention, a plurality of pieces of wood 30 are pressed together and the entire outer shape is formed into a prism or a plate shape. Not molded. Each of the lumbers 30 is, for example, protruded at a hard portion so that pressure is evenly distributed, and adjacent lumbers which are in close contact with the protruding portions are provided with concave portions so as to be closely adhered to each other.

[0010]

According to the method for producing laminated wood of the present invention, for example, as shown in FIGS.
To manufacture. In FIG. 2, five pieces of wood 30 are compressed together in parallel, and the outer shape is formed into a columnar shape as shown in FIG. The laminated wood 16 shown in FIG. 3 that is compressed and bonded has a columnar overall shape, but the respective wooden pieces 30 do not have a prismatic outer shape. The wood surface protrudes from a hard portion of the wood 30 or a portion where a gap is formed between the woods 30 and closely adheres to the adjacent wood 30.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. However, the following examples illustrate a method of manufacturing a laminated wood for embodying the technical idea of the present invention, and the present invention does not specify a manufacturing method as a method.

Further, in this specification, in order to make it easy to understand the claims, the numbers corresponding to the members shown in the embodiments will be referred to as “claims” and “ In the column of “means”. However, the members described in the claims are not limited to the members of the embodiments.

FIGS. 4 to 6 show a pressing apparatus used in the method for manufacturing laminated wood according to the present invention. This press machine
A primary heater 1 for primary heating the wood 30 with steam, a press 2 for pressing the primary heated wood 30 around the entire circumference and compressing it into a high-density columnar shape as shown in FIGS. 5 and 6; The wood 30 heated by the heating machine is inserted into the press 2, and the wood 30 compressed by the press 2 is discharged from the press 2. A cooling pipe 32 for cooling.

As shown in the schematic diagram of FIG. 4, the primary heating device 1 has a cylindrical primary heating pipe 3 divided into a plurality of tubes.
And a boiler 4 for pressurizing and applying pressurized steam to the primary heating pipe 3 independently of the plurality of primary heating pipes 3, and a pipe 5 for supplying heated and pressurized steam discharged from the boiler 4 to the primary heating pipe 3.
And

The primary heating pipe 3 is shown in the perspective view of FIG.
As shown in the cross-sectional view of FIG. The pipe 3A shown in the figure has one end airtightly closed and the other end open. The opening of the primary heating pipe 3 serves as an entrance 3B of the wood 30. Further, the primary heating pipe 3 is equipped with an opening / closing lid 6 for hermetically closing the pipe 3A as shown in the figure.

The primary heating pipe 3 has a plurality of pieces of wood 30 inserted therein and heats the wood 30 in the pipe with steam. The primary heating pipe 3 is composed of a plurality of pieces of wood 3 to be pressed.
Heat 0 together. For this reason, the pipe 3A is designed to have a thickness and a length that can be heated together to insert a plurality of pieces of wood 30 to be one pillar or one piece of plate-like aggregated wood. Further, the pipe 3A has a strength that does not deform even when pressurized and heated steam is injected. Primary heating pipe 3
When the thickness of a plurality of pieces of wood 30 to be compressed together is designed to be put together, the total number of pieces can be reduced. However,
Each piece of wood can be heated separately with a primary heating pipe.

The primary heating pipe 3 is preferably cylindrical as shown in the figure. This is because the cylindrical pipe 3A can equalize the pressure applied from the inside. However, the primary heating pipe may have a prismatic shape.

The opening / closing lid 6 is a circular metal plate,
Airtightly closed. The method of closing the pipe 3A is, for example, as shown in FIGS.
Is provided with a flange 7 on the periphery thereof, and the opening / closing lid 6 is connected and fixed at this portion. Therefore, the opening / closing lid 6 has an outer diameter substantially equal to the outer diameter of the flange 7. Further, the opening / closing lid 6
Is provided with a plurality of through-holes 6A in the outer peripheral portion and in contact with the flange 7. The flange 7 of the pipe 3A also has a plurality of through holes 7A at positions facing the through holes 6A of the opening / closing lid 6. The opening / closing lid 6 is connected and fixed by inserting a connecting tool 8 such as a bolt into these through holes 6A and 7A. Further, the opening / closing lid 6 is connected to the outer peripheral edge of the flange 7 via a bendable hinge 9 at a part of the outer peripheral edge. Therefore, the opening / closing lid 6 has a structure that can be opened and closed as indicated by the arrow A in the figure. However, the opening / closing lid may be detachable without providing a hinge.

Further, the opening / closing lid 6 is provided with a packing 10 at a portion in contact with the pipe 3A. The opening / closing lid 6 having the packing 10 in this portion airtightly closes the pipe 3A while being fixed to the pipe 3A. The primary heating pipe 3 needs to seal the pressurized heated and pressurized steam. For this reason, the opening / closing lid 6 has such a structure that the pipe 3A can be hermetically closed. However, the method by which the opening / closing lid hermetically closes the pipe is not specified in this method. Although not shown, the opening / closing lid may be formed as a screw-in type lid by providing a male screw and a female screw at the entrance and exit of the pipe without providing a flange to the pipe and connecting them. Furthermore, the primary heating pipe can connect the opening / closing lid with various other structures capable of closing the entrance / exit hermetically.

The primary heating pipe 3 shown in FIGS.
Has an opening 3B of the wood 30 at one end of the pipe 3A, but the primary heating pipe may have openings at both ends of the pipe. Although not shown, the primary heating pipe having an entrance at both ends is provided with open / close lids at both ends to have a structure in which the pipe is hermetically closed. The primary heating pipe of this structure can be used by distinguishing one opening into a wood insertion port and the other into a wood discharge port.

Further, the primary heating pipe 3 has a press-fitting portion 3C for sucking heated and pressurized steam. The press-fit portion 3C is perpendicular to the side surface of the pipe 3A in FIGS.
The press-fit tube 11 is provided so as to protrude from the side surface. The press-fitting pipe 11 is a metal pipe, and one end thereof is fixed to an opening provided on a side surface of the primary heating pipe 3 by welding or the like. The press-fitting pipe 11 is hermetically welded to the primary heating pipe 3 and communicates with the inside of the primary heating pipe 3. The other end of the press-fit pipe 11 is connected to the pipe via a socket (not shown) and a pressure hose. Further, the press-fit pipe 11 is provided with an on-off valve 12. On-off valve 12
Opening and closing regulates the suction and stoppage of the injected steam.
However, the press-fitting part 3C shown in the figure has the press-fitting pipe 11 disposed on the side surface of the primary heating pipe 3, but the position of the press-fitting pipe 11 is as follows.
Do not specify this position. Further, although not shown, the press-fitting portion may have any other structure capable of supplying heated and pressurized steam to the primary heating pipe.

Further, the primary heating machine 1 shown in FIG. 4 has six primary heating pipes 3 arranged therein, and the number of the primary heating pipes 3 arranged in the primary heating machine 1 is equal to the number of the wood 30. ,
Adjust according to thickness, type, shape, etc. This is because the time for heating the wood and the time for pressing the wood vary depending on the number, thickness, type, shape, and the like of the wood. For example, thick wood takes longer to heat. The number of primary heating pipes provided in the press device is determined by the heating time of the wood and the pressing time of the heated wood. When processing wood with a long heating time or wood with a short press time, increase the number of primary heating pipes.When processing wood with a short heating time or wood with a long press time, use a primary heating pipe. Reduce the number. For example, if the time for heating wood with the primary heating pipe is 30 minutes and the time for pressing wood with a press machine is 5 minutes,
Six primary heating pipes are provided.

The boiler 4 heats water to generate steam. The steam generated in the boiler 4 is, for example, 130 to
The temperature is set to 250 ° C, preferably 130 to 200 ° C. The heated and pressurized steam sent from the boiler 4 is injected into the primary heating pipe 3 through a pipe 5 as shown in FIG. A steam stop valve 13 is attached to the outlet of the boiler 4, and regulates heating, supply of pressurized steam discharged from the boiler 4 by opening and closing, and stopping.

The pipe 5 is a pipe for supplying the heated and pressurized steam discharged from the boiler 4 to the primary heating pipe 3. The pipe 5 is independent of the plurality of primary heating pipes 3,
It is branched into a plurality of parts so that pressurized and heated steam can be supplied. The pipe 5 is provided with a connecting pipe 15 via an on-off valve 14 at the tip of the pipe 5 branched into a plurality. Connecting pipe 15
Is connected to a tip of a press-fitting pipe 11 which is a press-fitting portion 3C of the primary heating pipe 3 via a socket (not shown) or the like, and is communicated therewith. The pipe 5 of this structure has a feature that the primary heating pipe 3 can be removed at the connecting pipe 15 portion. The pipes 5 of this structure that can easily attach and detach the primary heating pipes 3 can be conveniently used according to the number of the primary heating pipes 3 provided.

The wood 30 sufficiently heated by the primary heating pipe 1 is taken out of the primary heating pipe 1 and carried into the press 2. In order to insert the wood 30 into the molding chamber 2A of the press 2, the wood 30 is set on the supply side of the press 2 and in front of the extrusion rod 31 as shown by the arrow A in FIGS. 5 and 6. . The extrusion rod 31 is a cylinder disposed on the supply side of the press 2 in a straight line with respect to the molding chamber 2A of the press 2. The wood 30 set on the front surface of the extrusion rod 31 is inserted into the molding chamber 2A of the press 2 by extending the extrusion rod 31.

The press 2 presses the wood 30 that has been primarily heated. As shown in FIGS. 9 and 10, the press machine 2 has a plurality of divided press units U linearly connected in series adjacent to each other. The press 2 adjusts the number of units to be connected according to the total length of the wood to be pressed. The press machine 2 that presses long timber increases the number of connected press units U.

For example, if the length of the press surface of the press unit U is designed to be 50 cm, the press machine 2 shown in FIGS. 9 and 10 has eight press units U connected in series. Can be pressed. The press 2 shown in FIGS. 5 and 6 has six press units U.
Are connected in series, so that 3 m wood can be pressed. Further, the press machine can press wood having different lengths by changing the number of connected press units.

The press unit U is shown in FIGS.
4. Press the surface of the wood 30 into a prismatic shape as shown in FIG.
It comprises a plurality of press plates 17A, 17B, 17C, 17D, and a vertical cylinder 19 and a horizontal cylinder 18 for pressing the opposing press plates. The press plate is made of wood 30
1st press board 17A which presses in the direction, and 2nd press board 1
7B, a third press plate 17C, and a fourth press plate 17D. Each press plate is disposed at a right angle to an adjacent press plate and mounted so as to be movable in a direction parallel to the surface thereof.

The vertical and horizontal cylinders 19 and 18 are a horizontal cylinder 18 for bringing the first press plate 17A and the third press plate 17C closer to each other, and a vertical cylinder 19 for bringing the second press plate 17B and the fourth press plate 17D closer to each other. Consists of

Press plates 17A, 17B, 17C, 17D
Is a metal plate that does not deform even when the wood 30 is pressed. The first press plate 17A and the third press plate 17C face each other, and the second press plate 17B and the fourth press plate 17D are provided at positions facing each other. First press plate 17
A is the lower surface of the wood 30 and the third press plate 17C is the wood 30
Press the upper surface of. Therefore, the first press plate 17A and the third press plate 17C are disposed horizontally, and the second press plate 17B and the fourth
They are arranged so that they can approach each other via a press plate 17D.

Second press plate 17B and fourth press plate 17D
Are vertically arranged opposite to each other, and press both side surfaces of the wood 30. In the figure, the second press plate 17B is made of wood 30
, The fourth press plate 17D presses the right side of the wood 30.

Four press plates 17A, 17B, 17C,
17D is connected to the adjacent press plates by the same structure. First press plate 17A and second press plate 1
7B, the second press plate 17B and the third press plate 17C, the third
Press plate 17C, fourth press plate 17D, fourth press plate 1
7D and the first press plate 17A are connected by the same structure.

Hereinafter, the connection structure of the first press plate 17A and the second press plate 17B will be described in detail. The other connection structure of the press plates is the same as the connection structure of the first press plate 17A and the second press plate 17B. As shown in FIG. 15, the second press plate 17B is disposed adjacent to the first press plate 17A at a right angle. The second press plate 17B moves in a horizontal direction in a direction parallel to the surface of the first press plate 17A disposed horizontally and presses the wood in a posture of standing vertically.

The second press plate 17B is connected to the first press plate 17A via a direct-acting bearing 20, as shown in the sectional view of FIG. FIG. 16 is a sectional view taken along line AA of FIG. The linear motion bearing 20 is the second press plate 1
7B is moved in the pressing direction of the wood. The linear bearing 20 does not move the second press plate 17B in a direction orthogonal to the press direction. The linear motion bearing 20 connects an arm 21 protruding from the back surface of the second press plate 17B to the first press plate 17A. The arm 21 is connected to the first press plate 1
It is fixed in a direction parallel to the surface of 7A and parallel thereto. A triangular reinforcing rib 22 is fixed to the back surface of the arm 21 and the second press plate 17B. The reinforcing rib 22 is connected so that the arm 21 does not bend with respect to the second press plate 17B. Arm 21 fixed to second press plate 17B
Are connected via a linear bearing 20 so as to be movable along the first press plate 17A. A plurality of linear motion bearings 20 are arranged in parallel and arranged between the arm 21 and the first press plate 17A.

The linear motion bearing 20 is provided on the second press plate 17
B can be moved lightly with respect to the first press plate 17A. Second
The press plate 17B and the first press plate 17A do not necessarily need to be connected via the linear bearing 20. Any mechanism that can move the second press plate 17B in the press direction in a direction parallel to the surface of the first press plate 17A can be used.
For example, a plurality of guides may be fixed to the arm-facing surface of the first press plate by extending in the pressing direction, and a slider sliding along the guides may be fixed to the arm. The slider moves along the guide but does not come off the arm.

The press unit U includes a second press plate 17B.
And a horizontal cylinder 18 for pressing the fourth press plate 17D in the wood pressing direction is constituted by a first cylinder 18A and a third cylinder 18B. The first cylinder 18A has a rear end fixed to the first press plate 17A and a front end of the rod
It is connected to the press plate 17B. 1st cylinder 18A
Is in a posture parallel to the pressing direction of the second press plate 17B,
It is fixed to the first press plate 17A. The first cylinder 18A moves the second press plate 17B in parallel to strongly press the wood. The third cylinder 18B has the same structure as the first cylinder 18A, and is fixed to the third press plate 17C.

The vertical cylinder 19 includes a second cylinder 19
A and the fourth cylinder 19B, and the second cylinder 1
9A has the same structure as the first cylinder 18A and is fixed to the second press plate 17B. The fourth cylinder 19B has the same structure as the first cylinder 18A and has the fourth press plate 17B.
D is fixed.

The press unit U shown in the above-mentioned figure is provided with a pair of horizontal cylinders 18 and a pair of vertical cylinders 19 in one unit. Although not shown, the press unit may include a plurality of pairs of horizontal cylinders and vertical cylinders. A press unit having a plurality of pairs of cylinders can be pressed by reducing the pressure applied to one cylinder.

Further, a press unit U shown in FIG.
Are the third cylinder 18B of the device shown in FIG.
The cylinder 19B is omitted, and the horizontal cylinder 18 is
The vertical cylinder 19 is constituted by the second cylinder 19A with the cylinder 18A. In the apparatus having this structure, the first cylinder 18A presses the wood 30 from both sides by the second press plate 17B and the fourth press plate 17D, and the second cylinder 19A presses the wood 30 by the third press plate 17C and the first press plate 17A. Press from above and below. The press unit U of this structure,
The press plate 17 adjacent via the linear motion bearing 20
A, 17B, 17C and 17D are connected to each other so as to be movable in the pressing direction. This press unit U
The feature is that the structure can be simplified by reducing the number of cylinders.

The press unit U having the above structure is similar to that shown in FIG.
12, the bottom surface of the first press plate 17A is fixed to the base 26. The press unit U includes a base 26
, A plurality of units are connected in series.
A plurality of press units U adjacent to each other are linearly connected in series to form a press machine 2.

Further, in the press machine 2 shown in FIGS. 9 to 12, a hot plate 27 is provided on the surface of wood to be pressed. The hot plate 27 is provided on the surface of the press plate, which is in contact with the wood. The hot plate 27 is disposed in close contact with the surface of each press plate. That is, the four hot plates 27 from the first press plate to the fourth press plate are arranged at right angles to the adjacent hot plates 27, respectively. The square space formed by these four hot plates 27 becomes the wood forming chamber 2A to be pressed.

Further, the hot plate 27 has a length equal to the entire length of the press 2 to which the plurality of press units U are connected. That is, the hot plate 27 is extended so that the back surface thereof is in contact with the surface of the adjacent press plate, and connects the press plates of the plurality of press units U connected linearly. The four hot plates 27 arranged in this state are
Contacts the wood with its surface covering the four sides of the pressed wood. Accordingly, the wood is pressed onto the press plate from four directions with the opposing side surfaces sandwiched between the hot plates 27. The press machine 2 that presses the entire circumference of the wood via the hot plate 27 eliminates the seam formed at the connection portion of the press unit U, and can process the surface of the wood to be flat and straight.

Further, in the press 2 shown in the figure, an electrode plate 25 is provided on the surface of the hot plate 27 facing the press plate 2. Electrode plate 2
5 is connected to the high frequency power supply 23. High frequency power supply 23
Connected to the surface of the wood 30
Heats the wood 30 with high frequency energy. At this time, the press plate and the electrode plate 25 need to be insulated from each other. As shown in FIG. 18, a simple structure for insulating the press plate is to fix an electrode plate 25 to the surface of a hot plate 27 via an insulating material 24 such as plastic, It is to provide. The electrode plate 25 is made of an insulating material 24.
It is insulated from the press plate while being buried. Electrode plate 2
Reference numeral 5 denotes a press surface of the wood 30 and is connected to the high frequency power supply 23. The press machine 2 having this structure has a feature that it can heat and press wood that is previously heated or not heated. The preheated wood is slightly cooled before being set in the press machine 2. The press machine 2 capable of high-frequency heating of wood with a press plate can re-heat and efficiently press wood even if the wood is slightly cooled before setting. Furthermore, after setting and heating wood that is not heated at all, it can be pressed.

Wood 30 compressed into a column by press machine 2
Is pressed in a non-cooled state by the pushing rod 31 by the pressing machine 2.
Is extruded from the molding chamber 2 </ b> A, and inserted into the cooling shape retaining pipe 32. As shown in FIGS. 5 and 6, the cooling shape retaining pipe 32 is disposed linearly with respect to the molding chamber 2 </ b> A of the press 2 and the extrusion rod 31. As shown in the perspective view of FIG. 19, the cooling shape retaining pipe 32 is a prismatic stainless steel pipe. The cooling shape pipe 32 can also be manufactured with metals other than stainless steel. In addition, the cooling shape pipe 32
Has substantially the same inner diameter as the molding chamber 2A in the compressed state. This is for keeping the compressed wood in a compression molded state. Further, as shown in FIG.
Both ends are opened, and a flange 33 is provided on the periphery of one opening. The opening having the flange 33 is disposed on the discharge side of the press machine 2 and serves as a wood supply port 32A, and the other opening serves as a wood discharge port 32B. The cooling shaped pipe 32 having a flange 33 on the periphery of the supply port 32A is:
As shown in FIGS. 5 and 6, in a state where the flange 33 is locked to the base 34, the wood 30 is inserted into the molding chamber 2 </ b> A of the press 2 while being linearly positioned. Therefore, the base 34 is provided with a locking portion (not shown) for locking the flange 33 at a predetermined position on the upper surface. The wood 30 extruded from the molding chamber 2A of the press 2 by the extrusion rod 31 slides on the inner surface of the cooling shape pipe 32 while the cooling shape pipe 3
Inserted into 2.

The cooling shape retaining pipe 32 into which the compressed wood 30 is inserted in a non-cooled state takes several hours to several tens of hours.
After being kept in the heated state, it is cooled by the cooling means 35. In order to keep the cooling shape pipe 32 in a heated state,
The cooling shape pipe 32 into which the wood has been inserted is carried into a heating chamber (not shown). After being taken out of the heating chamber, the cooling pipe 32 is cooled by cooling means 35. The cooling means is, for example, a water-cooled cooling device 36, and a plurality of washing nozzles 37 are provided as shown in FIG. Cooling shape pipe 3
2 is cooled by the water jetted from the washing nozzle 37. However, the cooling means 35 of the cooling shape pipe 32 is
The water-cooled cooling device 36 is not specified. The cooling shape pipe can be cooled in various other ways.

The cooling shape-keeping pipe 32 is provided with the inserted wood 3
The wood 30 is cooled by bringing the surface of No. 0 into close contact with the inner surface of the cooling pipe 32. The wood 30 is kept in a compression molded state by the cooling shape keeping pipe 32 and cooled. The wood 30 which has been deprived of heat by the cooling shape retaining pipe 32 and cooled to 80 ° C. or lower is released from the glass transition state and is fixed in a compression molded shape.

The cooled cooling pipe 32 is moved to the front of the discharge rod 38 as shown by the arrow B in FIG. The cooling shape pipe 32 is arranged linearly with respect to the discharge rod 38. The discharge rod 38 extends the rod and pushes the cooled wood 30 out of the cooling shape retaining pipe 32. The cooled and shaped wood 30 is discharged from the outlet 32B.

Using the above apparatus, laminated wood is manufactured as follows. (1) Plural pieces of wood 30 that become one piece of wood 16
It is put into the primary heating pipe 3 and the entrance 3B is hermetically sealed with the opening / closing lid 6. The heated and pressurized steam is injected into the closed primary heating pipe 3 to heat the entire wood 30. The heating temperature of the wood 30 is, for example, 80C to 250C, preferably 100C to 200C, and more preferably 150C to 200C.
° C. The heating temperature of the wood 30 is adjusted to an optimum value in consideration of the type and thickness of the wood 30 and the heating state of the press 2. In the case where cedar thinned wood having a diameter of about 9 cm is used for the wood and the wood is not heated by a press, the heating temperature is, for example, about 180 ° C. Timber 30 carried in by press machine 2
In the method of heating with high frequency, the temperature for heating with the primary heating pipe 3 can be lowered.

The wood 30 to be put into the primary heating pipe 3 has, for example, a surface processed into a columnar or prismatic shape, or has its skin removed. The wood processed into a column shape is processed into the same diameter as a whole, or into a shape in which the tip becomes gradually thinner. Wood with a thin tip is
Do not insert in the primary heating pipe in the same direction. For example, when one piece of wood is made of four pieces of wood, the tips of the two pieces of wood are inserted into the primary heating pipe with their tips inverted. This is to make the overall density uniform in the state of the laminated wood.

The method of pressing a plurality of pieces of wood cut in a column shape together and compressing the pieces into a prism shape has a feature that the amount of raw wood to be discarded is reduced and the wood can be effectively used. Furthermore, the method of processing the raw wood into a tapered shape that becomes gradually thinner, and reversing the direction of the wood to assemble it into aggregated wood, can further reduce the waste of the raw wood. This is because the logs are gradually tapering toward the tip. Further, a plurality of logs that are not cut can be pressed together and compressed into a prismatic shape. Glued wood obtained by pressing uncut raw wood into a prismatic shape has a unique surface pattern and can be used as a decorative material for floor pillars and the like.

(2) Plural pieces of wood 30 are put in the next primary heating pipe 3 and heated in the same manner as (1). This process is repeated every 5 minutes, and the wood 30 is put into all the primary heating pipes 3 and heated.

(3) When the wood 30 inserted into the first primary heating pipe 3 is sufficiently heated, a plurality of heated wood 30 are taken out together and carried into the press machine 2. The wood 30 heated by the primary heating pipe 3 is immediately carried into the press 2 so as not to be cooled. After being empty, the next unheated wood 30 is put in the primary heating pipe 3 and hermetically sealed, and then heated and pressurized steam is injected to heat the wood 30.

(4) In order to carry the heated wood 30 into the press machine 2, the primary heated wood 30 is transferred to the extrusion rod 3.
Set to the front of 1. At this time, the extrusion rod 31 is contracted, and the press machine 2 contracts the cylinder,
The space between the press plates is widely opened, and the molding chamber 2A is expanded. The extruded rod 31 is extended, and the primary-heated wood 30 is inserted into the molding chamber 2A of the press 2. Press machine 2
Are pressed together. The pressed wood 30 has an overall shape of a prism or a plate.

(5) The press equipped with the high frequency power supply 23 heats the wood 30 again with high frequency and presses it. At this time, the internal temperature of the wood 30 is, for example, 130 to 250 ° C.
Preferably it is about 180 ° C. The wood 30 is pressed from four directions by the vertical and horizontal cylinders 19 and 18 of the press machine 2 and compressed. The press machine is, for example, 10 to 30 kg / c
The wood is compressed at a pressure of m ² , preferably about 20 kg / cm ² . The plurality of pieces of wood 30 are pressed by the press 2 over the entire circumference, and are compressed into a high-density columnar shape.

(6) After a plurality of pieces of wood 30 are pressed together and formed, the rods of the vertical and horizontal cylinders 19 and 18 are contracted to release the pressure. The extruding rod 31 is extended, and the plurality of woods 30 are extruded together from the molding chamber 2A of the press 2 and inserted into a cooling shape pipe 32 set on the discharge side of the press 2. The plurality of woods 30 are inserted together into the cooling shape pipe 32 in an uncooled state.

(7) The cooling shape pipe 32 into which the plurality of pieces of wood 30 are inserted together is carried into the heating chamber. In the heating room, the wood 30 is left at about 180 ° C. for about 10 hours via the cooling shape pipe 32. The wood temperature in the heating chamber can be between 130 and 250C. Also,
The time for maintaining the heating state in the heating chamber may be 3 to 24 hours. When wood is kept in a heated state at a high temperature for a long time, there is a feature that deformation after cooling can be reduced.

(8) After maintaining the heating state for a certain time, the cooling shape pipe 32 into which a plurality of woods are inserted together is transferred from the heating chamber to the cooling means 35. The cooling means 35
The cooling shape pipe 32 is cooled by water jetted from a plurality of washing nozzles 37. The cooling shape pipe 32 cools the wood 30 by bringing the surface of the inserted wood 30 into close contact with the inner surface of the cooling shape pipe 32. The plurality of pieces of wood 30 are kept in a compression-molded state by the cooling shape-keeping pipe 32 and cooled. The wood 30 cooled down to 80 ° C. or less by the heat deprived of the cooling shape pipe 32 is released from the glass transition state,
It is fixed in a compression molded shape.

(9) The wood 30 sufficiently cooled by the cooling pipe 32 is pushed out of the pipe 32 by the discharge rod 38.

(10) The conveyed wood 30 is separated and an adhesive is applied to the bonding surface. Adhesives include vinyl acetate,
An adhesive for wood such as urethane or epoxy is used. The adhesive is applied to the surfaces to be bonded to each other and applied to the entire surface.

(11) The wood to which the adhesive has been applied is assembled in a pressed state, and the outer surface is pressed again to cure the adhesive. The pressing pressure at this time is a pressure for pressing the tight contact surface of the wood without any gap, for example, 1 to 10 kg / c.
m ² and can be lowered. A plurality of pieces of wood are bonded to form a piece of wood 16.

In the above embodiments, four pieces of wood are pressed together in a columnar shape to produce a piece of wood. According to the method of manufacturing laminated wood of the present invention, as shown in FIGS. 2 and 3, five pieces of wood can be pressed together, and further, as shown in FIGS. Can be compressed into a columnar or plate shape, and the wood 30 can be bonded to form the laminated wood 16. Further, the method of manufacturing laminated wood according to the present invention has a feature that the laminated wood 16 can be manufactured by combining woods 30 having different lengths as shown in FIG.

[0062]

According to the method for producing laminated wood of the present invention, tough laminated wood can be efficiently produced by effectively utilizing thin wood. This is because the manufacturing method of the present invention compresses a plurality of pieces of wood together to form a columnar or plate-like shape, and in this state, glues the wood to form a laminated wood. In particular, in the manufacturing method of the present invention, a plurality of pieces of wood are pressed together to form a columnar or plate-like outer shape, but the contact surfaces of the respective pieces of wood are not flat. Adhesive surface of adjacent wood
The hard part of the wood protrudes, and the surface in close contact with this protruding part becomes uneven. For this reason, it is possible to realize a feature that a plurality of pieces of wood can be compressed without difficulty to reduce local damage and the like, and that the wood can be made tough as a whole.

Further, the glued wood manufactured by the method of the present invention also has a feature that the woods adjacent to each other can be securely bonded without any gap. This is because a plurality of pieces of wood are pressed together to form a contact surface into an uneven surface that is in close contact with each other, and the uneven surface is bonded with an adhesive. The laminated wood in which a plurality of woods are firmly bonded to each other has features that the strength as a whole is remarkably increased and the peeling of the adhesive can be effectively prevented.

[Brief description of the drawings]

FIG. 1 is a schematic perspective view showing a conventional method of manufacturing laminated wood.

FIG. 2 is a cross-sectional view showing a state in which wood is pressed by the method for manufacturing laminated wood according to the present invention.

FIG. 3 is a sectional view showing wood pressed by the method for manufacturing laminated wood according to the present invention.

FIG. 4 is a schematic diagram of a primary heating machine used in the method for producing laminated wood according to the present invention.

FIG. 5 is a front view of a press device used in the method for producing laminated wood according to the present invention.

6 is a schematic plan view of the press shown in FIG.

FIG. 7 is a perspective view of a primary heating pipe shown in FIG. 4;

FIG. 8 is a sectional view of the primary heating pipe shown in FIG.

FIG. 9 is a perspective view of a press machine used in the method for manufacturing laminated wood according to the present invention.

FIG. 10 is a front view of the press shown in FIG. 9;

FIG. 11 is a side view of the press unit shown in FIG. 9;

FIG. 12 is a perspective view of the press unit shown in FIG. 9;

13 is a schematic perspective view of the press unit shown in FIG.

FIG. 14 is a schematic sectional view of the press unit shown in FIG.

FIG. 15 is a sectional view showing a connection portion between a first press plate and a second press plate of the press unit shown in FIG. 11;

FIG. 16 is a sectional view taken along line AA of FIG. 15, showing a linear bearing portion for moving an adjacent press plate in the press direction.

FIG. 17 is a sectional view showing another specific example of the press unit.

FIG. 18 is a sectional view of a hot plate having an electrode plate connected to a high-frequency power supply.

FIG. 19 is a perspective view of the shape-preserving pipe shown in FIG. 5;

FIG. 20 is a sectional view showing another example of the step of pressing wood by the manufacturing method of the present invention.

FIG. 21 is a sectional view showing another example of the step of pressing wood by the manufacturing method of the present invention.

FIG. 22 is a sectional view showing another example of the step of pressing wood by the manufacturing method of the present invention.

FIG. 23 is a cross-sectional view showing another example of the step of pressing wood by the manufacturing method of the present invention.

FIG. 24 is a perspective view showing an example of a laminated wood manufactured by the manufacturing method of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Primary heating machine 2 ... Press machine 2A ... Molding chamber 3 ... Primary heating pipe 3A ... Pipe 3B ... Entrance 3C ... Press-fitting part 4 ... Boiler 5 ... Piping 6 ... Opening / closing lid 6A ... Through hole 7 ... Flange 7A ... Through hole 8 ... Connecting device 9 ... Hinges 10 ... Packing 11 ... Press-fit tube 12 ... On-off valve 13 ... Steam stop valve 14 ... On-off valve 15 ... Connecting pipe 16 ... Glued wood 17A ... First press plate 17B ... Second press plate 17C ... Third Press plate 17D Fourth press plate 18 Horizontal cylinder 18A First cylinder 18B Third cylinder 19 Vertical cylinder 19A Second cylinder 19B Fourth cylinder 20 Linear bearing 21 Arm 22 Reinforcing rib 23 High frequency power supply 24 ... Insulating material 25 ... Electrode plate 26 ... Base 27 ... Hot plate 28 ... Thinning material 29 ... Square wood 30 ... Wood 31 ... Extruded rod 32 ... Flop 32A ... supply port
32B ... discharge port 33 ... flange 34 ... base 35 ... cooling means 36 ... cooling device 37 ... washing nozzle 38 ... discharge rod U ... press unit

 ────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Yoshimasa Nagai 4-73-3 Minamitamiya, Tokushima City, Tokushima Prefecture

Claims (1)

[Claims] 1. A method for manufacturing a laminated wood in which a plurality of pieces of wood (30) are arranged in parallel and bonded to each other, wherein a plurality of heated pieces of wood (30) are arranged in parallel and compressed from four outer directions to reduce the volume. The whole outer shape is made into a prismatic or plate-like shape, the contact surfaces of the adjacent woods (30) are brought into close contact with each other as an uneven surface, and the adhered surfaces of the wood (30) are adhered to each other. .