KR100507395B1 - Method of manufacturing glued laminated wood - Google Patents

Abstract

The present invention discloses a method for producing a bonded laminated wood, such as laminated veneer lumber (LVL). The adhesive aggregate consists of a plurality of wood sheets (wood boards), such as veneer sheets (single plates), which are laminated together by a hot press into a multi-layer board of continuous length using a thermosetting adhesive, and the end joints of the wood sheets Are placed in a staggered array. A first base material is provided having a row of stepped ends comprising a horizontal plane having a longitudinal dimension shorter than the length of the wood sheet and a vertical plane having a height corresponding to the thickness of the wood sheet, crossing in a row. The adhesive aggregate is formed extending from the end of the first substrate. The hot press includes a pair of heating plates each having an effective press area that can cover the entire surface of the wood sheet. Upon hot pressing, an adhesive is applied on one surface of the wood sheet, and the board of adhesive adhesive in progress has the entire top surface of the wood sheet pressed from the top by one of the plates and the entire bottom surface of the wood sheet. It is positioned and held for a predetermined time at a position supported from the bottom by this other plate.

Description

Method of manufacturing adhesive aggregates {Method of manufacturing glued laminated wood}

The present invention relates to a method for producing a bonded laminated wood made of wood sheets such as veneer sheets provided by rotary peeling, slicing, or wood obtained by sawing or other processing. It is about. In particular, it relates to a method of stacking the wood sheets and laminating them together successively with a thermosetting adhesive to produce a multi-layer board or billet-shaped adhesive aggregate having a desired thickness and length.

For easier understanding of the background of the present invention, reference is first made to FIG. 73, which schematically illustrates a conventional laminated veneer lumber (LVL) manufacturing apparatus, wherein the veneer sheets are arranged in a staggered array. At the end joints, the wood grain of each veneer sheet is mainly extended along the length of the final product or LVL board.

The apparatus comprises three sets of hot presses (X, Y and Z) arranged in three different stages spaced at regular intervals along the direction in which the LVL board is conveyed as indicated by the arrows on the right side of the figure. Each hot press (X, Y, Z) has a pair of movable upper and lower heating plates (X1, Y1, Z1), each of which is arranged on top of each other. For the description of the device, these three sets of hot presses (X, Y, Z) represent the first, second and third hot presses, respectively. Although not specifically shown in the figures, three sets of veneer feeders are provided associated with each hot press (X, Y, Z), each set of top and bottom movable veneer sheets as indicated by arrows indicating the feed direction. Include a feeder. In the figures, reference numerals A, B and C indicate veneer sheets each having substantially the same length, width and thickness and arranged in the same direction, wherein the grains of the veneer sheets are substantially parallel to each other, namely LVL It extends along the longitudinal direction of the board. For the sake of illustration, each veneer sheet is shown to be exaggerated in thickness relative to its length, and a conveyor for moving the workpiece in the process is not shown.

In the manufacture of the LVL board using the apparatus of FIG. 73, a pair of veneer sheets A, shaded first, are prepared, and one surface of any one of the veneer sheets A is applied with a thermosetting adhesive. These veneer sheets A are joined in contact with each other by an adhesive-coating surface supplied by the first feeder of the first hot press X and located between the joining surfaces of the two veneer sheets A, The ends are offset or staggered as shown in the figure. Thus, the two veneer sheets A on which the other one is located are conveyed to the first press station between the first heating plates X1, where the veneer sheets A are hot press X. Are bonded together under heating and pressurization. After the first hot pressing operation is completed and the heating plates X1 are withdrawn, the bonded laminated veneer sheet A is conveyed toward the second pressing station of the second hot press Y. On the way to the second press station, i.e. at a suitable position between the first and second press stations, a pair of different veneer sheets B, shaded with adhesive applied to their respective inner surfaces, are connected to the second veneer sheet feeder. And staggered relative to the veneer sheet A on opposite outer surfaces of the pre-laminated veneer sheet A. Thus, the veneer sheets B positioned on the veneer sheets A are conveyed together to a second pressurization station, where the veneer sheets B are bonded to the laminated veneer sheet A so as to adhere to the laminated veneer sheet A. Is pressed by Y).

After the pressurization by the second hot press Y is completed, the laminated veneer sheets A and B are conveyed toward the third station in the third hot press Z. At a suitable position between the second and third stations, another pair of veneer sheets (C), shaded with an adhesive applied to each inner surface, is supplied by a third veneer feeder and the veneer sheet (B) They are placed in a staggered arrangement on the opposite outer face of the field. Thus, the veneer sheets C located on the laminated veneer sheets A and B are conveyed to a third pressurization station, where the veneer sheets C are similarly to the above by the third hot press Z. Is pressurized. Thus, an assembly of laminated veneer sheets A, B, and C is formed.

Working steps, including feeding, positioning, hot pressing and conveying of the veneer sheet, are carried out in succession at each position and station, resulting in an LVL board of six layers in total thickness in a manner known to those skilled in the art. As shown in FIG. 73, two adjacent veneer sheets A, B, or C in each layer are arranged in such a way that their ends are in close contact with each other to form an end joint, and the veneer sheets A, B, C) are located in the final LVL board so that the end joints are distributed in a regularly staggered arrangement. As will be apparent to those skilled in the art, if the end joints in any two adjacent layers are positioned in line with each other across the thickness of the board, there is a tendency for stress to concentrate in the joints when the board is subjected to bending force This may cause breakage of the board. Therefore, the purpose of staggering the end joints of the respective veneer sheets is to avoid stress concentration at specific locations of the board.

For successful adhesion of veneer sheets with the desired adhesive strength, heat and pressure must be applied uniformly by high temperature pressurization to the entire surface of the veneer sheet on which at least one joining surface is applied with an adhesive. However, in the apparatus at high temperature pressurization of a pair of veneer sheets (A, B, or C) in an offset or staggered arrangement as shown in FIG. 73, a portion of the veneer sheets joined in pairs is directly heated by a hot press. It does not accept pressurization. That is, when viewed in the conveying direction, the upstream ends of the veneer sheets A, B, and C indicated by R are subjected to a hot press, although some heat may be conducted to the upstream ends of the veneer sheets. It is not directly pressurized. As a result, the upstream ends of the veneer sheets are not bonded to the required strength and affect the quality of the finished product.

In an attempt to eliminate the drawback, if veneer sheets are positioned in a staggered arrangement in which region R is narrowed, the end joints in any two adjacent layers in the board should be located closer to each other, and then The board becomes weaker against bending.

Therefore, it is an object of the present invention to provide a method for producing an adhesive aggregate that can solve the above problems. In particular, it is an object of the present invention to provide a method capable of hot pressing an entire surface of a wood sheet, such as a veneer sheet, to produce an adhesive aggregate with the required strength and quality.

In order to achieve the above object, the present invention has a plurality of veneer sheets, each having a predetermined length, width and thickness, and laminated together into a multi-layer board of adhesive aggregate of continuous length by high temperature pressing using a thermosetting adhesive. Provided is a method for producing an adhesive aggregate comprising a wood sheet. In order to produce the board of the adhesive length of the continuous length, a first base material having an end portion formed by extending the longitudinal length of the adhesive aggregate material board is prepared. The ends of the first substrate are formed in the form of a row of steps comprising a horizontal plane having a longitudinal size shorter than the length of the wood sheet, intersecting in a row, and a surface formed obliquely to the horizontal plane. The spacing between any two adjacent horizontal planes across the thickness of the substrate is substantially equal to the thickness of the wood sheet. The wood sheets are positioned so that their ends are disposed in a face-to-face relationship with respect to each of the surfaces whose end portions are formed obliquely with respect to the horizontal plane, so that the wood sheets in the respective layers of the adhesive aggregate board adjacent to the end of the substrate Their opposite ends are laminated to the adhesive aggregate board so as to be spaced apart from the first substrate disposed in a staggered arrangement similar to the one-step step configuration described above at the end of the first substrate.

When laminating and hot pressing wood sheets to produce a continuous length of adhesive aggregate board, a pair of plates each having an effective pressing area to cover the entire surface of the wood sheet and having at least one plate heated thereon Including hot press is used. In hot pressing by the hot press for laminating at least one wood sheet, the board of adhesive adhesive in progress is the same while the entire top surface of the at least one wood sheet is pressed from the top by one of the plates and at the same time In a position where the entire bottom face of one wood sheet is supported from the bottom by the other plate, with an adhesive layer interposed between the surfaces of the wood sheet and the adjacent wood sheet, for a predetermined period of time maintain.

By hot pressing the wood sheet as above, the wood sheet is pressed throughout the wood sheet with uniform heat and pressure, so that close adhesion of the wood sheet for successful lamination can be achieved.

According to the invention, the angle with respect to the horizontal plane at the end of the first substrate is preferably a horizontal plane and a vertical plane where the end of the first substrate has a height substantially equal to the thickness of the wood sheet and intersects in a line. It must be at right angles to form a single row of steps comprising, so that each wood sheet has opposing ends cut at right angles through its thickness.

When using the first substrate and the wood sheet, each wood sheet in each layer should preferably be placed on the adhesive aggregate board such that the ends contact the ends of the adjacent wood sheets in the same layer.

Instead of forming an end joint by contacting adjacent ends, the wood sheets in each layer are arranged to form a space between any two opposing end faces of any two wood sheets adjacent in the same layer. Can be.

Optionally, each wood sheet may have opposing ends that are obliquely cut or obliquely processed at an angle in the same direction with respect to opposite surfaces of the wood sheet, wherein the wood sheets have the same inclined ends thereof. It can be laminated to have a configuration that overlaps adjacent similarly inclined ends of adjacent wood sheets in the layer, thereby forming end overlap seams on the final adhesive aggregate board.

In a preferred embodiment of the present invention, the first substrate is in the form of an assembly having one end formed in a row of steps described above comprising a horizontal plane and a vertical end face intersecting in a row with the wood sheets, the other one on top of the other. It consists of a plurality of wood sheets, one of which is assembled and laminated together.

According to a preferred embodiment of the invention, the individual wood sheets glued together into a multilayer board of adhesive aggregates comprise veneer sheets laminated together with wood grains extending predominantly along the length of the adhesive aggregate board.

Instead of at least one individual wood sheet of adhesive gluing board, at least two wood sheets glued together or fixed with an overall thickness substantially corresponding to the thickness of the individual wood sheet can be considered within the scope of the present invention. It should be noted that

In order to practice the method of the present invention, the method involves pressing the board of ongoing adhesive aggregate from the top of the at least one wood sheet from the top by one of the plates of the hot press and from the bottom of the same wood sheet. Moving to a position supported from the bottom by another plate.

The features and advantages of the present invention will become more apparent to those skilled in the art from the following description of various preferred embodiments according to the present invention, which description is made with reference to the accompanying drawings.

Hereinafter, embodiments of the method of manufacturing an adhesive aggregate according to the present invention will be described. The following description of the embodiments deals with the production of LVL as adhesive aggregate. All veneer sheets used in the examples are dried and substantially the same size, i.e., unless otherwise specified, for example about 4 mm thick, measured along the grain direction extending laterally in the plane of the drawing. It has a length of about 1,000 mm, and a width of about 600 mm. Since the above sizes of veneer sheets are used for illustrative purposes only, veneer sheets having any other size may be used. All veneer sheets are placed and glued together, the grain of which is mainly aligned along the length of the final LVL board. For illustration purposes, it should be noted that each veneer sheet is shown to have an unusually large thickness over its length, as in the case of FIG. 73.

First, a first preferred embodiment is described with reference to FIGS. 1A-1C, 2A-2C, 3A-3C, and 4A-4B. In the figures, reference numerals 3 and 5 indicate the lower and upper plates which are arranged one above another in a vertical alignment relationship to form a hot press, and the reference E is controllably as indicated by the double arrow. Instructs the conveyor to move in a reciprocating manner. In the present embodiment, the upper plate 5 is heated to about 190 ° C. by steam or electric heater, and can move approachably and retractably toward the fixed and unheated lower plate 3. These plates 3, 5 are of substantially the same size with the same longitudinal and width dimensions as the veneer sheet.

Referring to FIG. 1A, reference numeral 1 designates a veneer stacking assembly having a five-layer configuration as a first substrate on which LVL boards of continuous length from one end are manufactured. The stacking assembly 1 is made of a plurality of veneer sheets 1f which are placed together and bonded or fixed together in a regularly staggered arrangement, and end joints 1g in any two adjacent layers of veneer sheets 1f. They are spaced about 100 mm apart so that one end of the assembly 1 is formed in a row of uphill stairs from the outermost layer that protrudes outwardly as shown in FIG. 1A. The stacking assembly 1 made of veneer sheets 1f is prepared in advance and supported on the conveyor E to approach and retreat toward the plates 3, 5 of the hot press.

The veneer stacking assembly 1 as the first substrate can be produced in any convenient manner, for example, by manually stacking the veneer sheets 1f in a staggered arrangement and fixing with an adhesive. If the lamination assembly 1 is not used as part of the finished product, fixing of the veneer sheet can be achieved by using pressure sensitive double sided adhesive tape or any other suitable method. Optionally, the first substrate may be made of any material other than veneer sheets, for example, solid wood blocks or blocks that can be used by sawing, so as to have a desired single stepped step at one end thereof. Can be formed. This is also true for veneer stacking assemblies used in other embodiments described below.

In the description of the above embodiment, the bottom layer of the stacking assembly 1 is referred to as the first layer, and thus the other layers are named so that the top layer is the fifth layer in the case of the assembly 1 in the first embodiment. . In FIG. 1A, reference numerals 1a, 1b, 1c, 1d, and 1e indicate the end faces exposed in a line of veneer sheets in the first, second, third, fourth, and fifth layers, respectively, and these End faces are formed perpendicular to the top and bottom surfaces of the veneer stacking assembly 1, and are formed on the first and second sides of the veneer stacking assembly 1, which are formed parallel to the top and bottom surfaces of the stacking assembly 1. Spaced from each other at about 100 mm intervals by a series of exposed top surfaces 1j, 1k, 1m, and 1n of the veneer sheet in the second, third, and fourth layers. That is, each of the top surfaces 1j, 1k, 1m, and 1n has a longitudinal size of about 100 mm shorter than the length of the laminate veneer sheet described below. Since each veneer sheet 1f of the first base material 1 has substantially the same thickness as the laminated veneer sheet, the height of the end faces 1a, 1b, 1c, 1d, and 1e is substantially the laminated veneer sheet. Coincides with their thickness. This is also valid in other embodiments.

Reference numerals 11a and 11b in FIG. 1a indicate veneer sheets added for laminating to the veneer stacking assembly 1. The dotted line shown at the bottom of the veneer sheet 11b represents the adhesive application surface, and in other embodiments the same is true for any other veneer sheets shown with the dotted line. As the adhesive to be used, a thermosetting adhesive such as a phenol resin is preferable. Other preferred thermosetting adhesives include phenol, resorcinol, melamine and urea resins. The adhesive may be applied to the surface of the veneer sheet just before the veneer sheet is placed, or alternatively, the adhesive applied on the veneer sheet may be left to dry at room temperature for several hours.

In the initial state of the apparatus for carrying out the method of the first preferred embodiment, the upper heating plate 5 is located in the withdrawn upper position and the veneer stacking assembly 1 supported on the conveyor E is shown in FIG. 1A. As shown in, at the position where the exposed end face 1b of the veneer sheet in the second layer of the stacking assembly 1 is vertically aligned with the end face 3a, 5a of the plates 3, 5. Is located. Veneer sheets 11a and 11b are each prepared at any suitable position.

In the first step, the veneer sheet 11a is shown in FIG. 1B with its right end face in contact with the exposed end face 1a of the veneer sheet in the first layer of the veneer stacking assembly 1 as seen in the figure. It is fed as indicated by the arrow onto the lower fixing plate 3 to form the end joint 1h as shown.

Thereafter, the second veneer sheet 11b with the adhesive applied to the lower surface is onto the upper surface 1j of the veneer sheet 11a and onto the exposed upper surface 1j of the veneer sheet in the first layer of the lamination assembly 1. It is laminated and fed as indicated by the arrow so that the right end face of the veneer sheet 11b contacts the exposed end face 1b of the veneer sheet in the second layer of the lamination assembly 1. Thus, the end joint 1i is formed as shown in Fig. 1C.

After the veneer sheets 11a and 11b are laminated, the top heating plate 5 is placed on the top surface of the veneer sheet 11a and the veneer sheet 11b with respect to the surface 1j of the veneer sheet in the lamination assembly 1. Is lowered to hot press with the fixed bottom plate 3 at a pressure of about 1 MPa as shown in FIG. 2A. The high temperature pressurization lasts about 3 minutes, thereby forming the laminated veneer stacking assembly 101. Hot pressing conditions, including pressure, heat, and length of hot pressing time, may be selected according to various conditions such as veneer sheet thickness such that the adhesive cures to a sufficient degree to ensure the required adhesive strength.

As is apparent from FIG. 2A, the veneer sheet 11b having the veneer sheet 11a and the lower adhesive application surface positioned to contact the respective upper surfaces of the veneer sheet in the first layer of the stacking assembly 1 is A uniform pressure is applied from the heating plate 5 over the entire upper surface, and the entirety of the same veneer sheet 11b is lower fixing plate through the veneer sheet 11a and the veneer sheet in the first layer of the stacking assembly 1. It is stably supported by the lower part by (3). Therefore, the veneer sheet 11b can be firmly laminated to the veneer sheet 11a and the lamination assembly 1.

After about 3 minutes of high temperature pressurization, the heating plate 5 is raised to its original position, and the next veneer sheet 11c having an adhesive applied to its lower surface is prepared as shown in Fig. 2B.

After the heating plate 5 has completed the ascent, the conveyor E is exposed to the end face 1c of the veneer sheet in the third layer, as shown in FIG. 2C. It is operated to move the veneer stacking assembly 101 to the left as indicated by the arrow by a distance of about 100 mm so as to be in a vertical alignment relationship with 5a.

With the veneer stacking assembly 101 positioned as shown in FIG. 2C, the veneer sheet 11c has the veneer sheet in the third layer having the right end face of the sheet 11c as shown in FIG. 3A. It is supplied and placed on the top surface of the veneer sheet 11b and on the exposed top surface 1k of the veneer sheet in the second layer of the veneer stacking assembly 101 to contact the exposed end face 1c of the substrate.

Then, the upper heating plate 5 is lowered to pressurize the veneer sheet 11c together with the fixed lower plate 3 under the same high temperature pressurization conditions as described above, and the laminated veneer stacking assembly 102 is shown in FIG. 3B. It is formed as shown.

In this high temperature pressurization, the veneer sheet 11c is passed through two layers of veneer sheets so that the entire veneer sheet 11c is uniformly pressured to achieve a close adhesion to the lamination assembly 101. It can be pressed over its entire surface by 5) and supported at its bottom over its entire surface by the lower fixing plate 3.

After the veneer stacking assembly 102 has been formed, the fourth layer veneer sheet 11d and the fifth layer veneer sheet 11e are added for successive stacking in the same manner as described above, and accordingly, as shown in FIG. 3C. Likewise, a laminated veneer stacking assembly 104 is constructed. For the same reasons as described above, the veneer sheets 11d and 11e can be pressed over the entire surface to be firmly bonded to each of the previously formed veneer stacking assemblies.

After laminating the veneer sheet 11e, the upper heating plate 5 is raised to its withdrawn position, as shown in Fig. 4A. Subsequently, the conveyor E is exposed when the exposed end face of the veneer sheet in the second layer of the veneer stacking assembly 104 is aligned with the end face 5a of the upper heating plate 5 as shown in FIG. 4B. Until it is actuated to move the veneer sheet assembly 104 to the right as indicated by the arrows in FIG. 4B. As will be evident by comparing FIG. 4B to FIG. 1A, the shape of the left end portion of the veneer stacking assembly 104 is similar to that of the first substrate 1, and the left end of the stack assembly 104 is shown in FIG. 1A. Is positioned relative to the hot press in the same positional relationship as the positional relationship of the ends of the first substrate with respect to the hot press of. Thus, the stack assembly 104 can be used as a new substrate for subsequent veneer sheet stacking operations.

From the state of FIG. 4B, a series of working steps as described with reference to FIGS. 1B-4B are repeated the number of times needed to produce a 5-layer LVL board of the desired length. The final LVL board can be cut or cut to the desired length depending on the application.

As will be apparent from the above description of the first preferred embodiment, the veneer sheet, which is applied with an adhesive on the lower surface and positioned in place for lamination, is pressed entirely by the heating plate 5 and lowered by the lower fixing plate 3. Since firmly supported from, the veneer sheet receives heat and pressure uniformly over its entire surface, so that the adhesion of the veneer sheet for successful lamination can be achieved.

Further, in the above embodiment, lamination of veneer sheets for producing an adhesive aggregate having a desired thickness and length can be made possible by the use of a single step of a hot press together with the reciprocating conveyor E. Therefore, the apparatus for carrying out the method of the present invention can be manufactured at low cost compared to the conventional apparatus.

Now, referring to Figs. 5-18, a second preferred embodiment of the present invention is described below. This second embodiment is characterized in that the lower plate 3 of the hot press is replaced by a heating plate that can move towards and away from the heating plate 5 on the opposite side, and a plurality of veneer sheets in place It differs from the first embodiment in that it can be laminated simultaneously into a veneer stacking assembly.

Reference numeral 2 in FIG. 5 indicates a veneer stacking assembly as a first substrate consisting of a plurality of veneer sheets glued together in a staggered arrangement with an offset distance of about 100 mm. As will be evident from comparison with the veneer stacking assembly 1 of FIG. 1, the assembly 2 has a nine-layer structure, ie a fifth central layer protrudes outwardly from the veneer stacking assembly 2 and veneer sheets. Four layers each of which are laminated on both sides of the fifth layer are symmetrically about an imaginary centerline extending longitudinally through the veneer sheets in the fifth layer. Thus, the end portions of the veneer stacking assembly 2 are each formed in the form of two rows of uphill and downhill stairs from the central fifth layer.

In Fig. 5, reference numerals 2a, 2b, 2c, 2d, 2e, 2f, 2g, 2h, and 2i denote the first, second, third, fourth, fourth, and third veneer stacking assemblies 2 as respective first substrates. Indicate the exposed end face of the veneer sheet in the fifth, sixth, seventh, eighth, and ninth layers. On the other hand, reference numerals 2s, 2u, 2v, and 2w denote upwardly exposed surfaces of the veneer sheets in the fifth, sixth, seventh, eighth, and ninth layers, respectively, and reference numerals 2s ', 2u', 2v 'and 2w' designate the downwardly exposed surface of the veneer sheet in the fifth, fourth, third, second, and first layers, respectively. Any two adjacent exposed end faces 2a, 2b, 2c, 2d, 2e, 2f, 2g, 2h, 2i of the veneer sheets have an upper or lower exposed surface 2s, between the two end faces. 2u, 2v, 2w or 2s ', 2u', 2v ', 2w') at a distance of about 100 mm. In the figures, reference numerals 2m and 2k denote end joints of veneer sheets in the four upper layers and end joints of the veneer sheets in the four lower layers, respectively. As can be seen from the figure, the end joints 2m, 2k are symmetrically distributed with respect to the fifth layer in the center of the assembly 2.

As in the case of the first embodiment, the veneer stacking assembly 2 as the first substrate is supported and carried by a reciprocating conveyor E.

As described above, the second embodiment is provided with a movable heating plate 4 which is heated to about 190 ° C. by steam or electric heater instead of the fixed bottom plate 3 of the first embodiment. The heating plate 4 is, for example, between the lower retracted position as shown in FIG. 5 which does not interfere with the feeding operation of the veneer sheet and, for example, the raised operating position as shown in FIG. 7. You can move on. The upper heating plate 5 is heated and movable in the same manner as in the first embodiment. The two heating plates 4, 5 constituting the hot press are aligned vertically with the right end faces 4a, 5a located in a common imaginary vertical plane (not shown). Is placed.

Reference numeral 13a denotes a veneer sheet having a thermosetting adhesive applied to the upper surface as indicated by the dotted line, and the heating plates 4 and 5 described above are large enough to cover the entire surface area of the veneer sheet 13a. And widthwise size.

In the initial state of the apparatus for carrying out the method of the second preferred embodiment, the heating plates 4, 5 are withdrawn to their lower and upper non-operational positions, respectively, and the veneer stacking assembly carried on the conveyor E is shown in FIG. 5. As shown in, the exposed end face 2d of the veneer sheet in the fourth layer and the free end 2f of the veneer sheet in the sixth layer are respectively the end faces 4a of the heating plates 4, 5. , 5a). The veneer sheet 13a for laminating to the lamination assembly 2 is prepared in any convenient standby position.

In the first step, the veneer sheet 13a is supplied as indicated by the arrow on the upper surface of the lower heating plate 4 such that its right end surface is vertically aligned with the right end surface 4a of the heating plate 4 and At the same time, as shown in FIG. 6, the second veneer sheet 13b to which no adhesive is applied is prepared.

The lower heating plate 4 then adheres to the exposed end surface 2d of the veneer sheet in the fourth layer, as the right end surface of the veneer sheet 13a on the heating plate 4 is shown in FIG. Is raised to the position.

Then, the second veneer sheet 13b has the exposed end face 2e of the veneer sheet in the fifth layer of the veneer stacking assembly 2, as the right end face of the veneer sheet 13b is shown in FIG. The adhesive of the veneer sheet 13a is supplied and placed on the coated upper surface so as to be in close contact therewith. At the same time, the third veneer sheet 13c to which the adhesive is applied to the lower surface is prepared.

As shown in FIG. 9, the veneer sheet 13c is such that the right end face of the veneer sheet 13c contacts the exposed end face 2f of the veneer sheet in the sixth layer of the veneer stacking assembly 2. It is supplied and placed on the top surface of the veneer sheet 13b and on the exposed surface 2s of the veneer sheet in the fifth layer of the stacking assembly 2.

After these three veneer sheets 13a, 13b, 13c have been laminated, the upper heating plate 5 is hot pressed to the three veneer sheets together with the lower heating plate 4, as shown in FIG. To descend. The high temperature pressurization lasts for about 3 minutes under a pressure of about 1 MPa. As shown in FIG. 10, the veneer sheets 13a and 13c are adhered to the protruding ends of the intermediate veneer sheet 13b and the veneer stacking assembly 2, thereby forming the veneer stacking assembly 201. In this high temperature pressurization, since the heating plates 4 and 5 are kept in pressure contact with the entire surface of the veneer sheets 13a and 13c, the adhesive coated surface of the veneer sheets is removed from the heating plates. Since it is subjected to uniform pressure, a close adhesion for successfully laminating the veneer sheet to the stacking assembly 2 can be achieved.

Since some heat is conducted to the veneer sheet 13a, as shown in FIG. 10, as shown in FIG. 6, before the high temperature pressurization by the two heating plates 4 and 5 is performed, the veneer sheet 13a ) Is conducted to the adhesive on its upper surface during the elapsed time from the moment it is placed on the heating plate 4. However, since this time length is too short, the heat does not affect the adhesive on the veneer sheet 13a.

After three minutes have elapsed, the two heating plates 4 and 5 are respectively withdrawn to the non-operational position as shown in FIG. 11, and then the conveyor E is shown as shown in FIG. 12, the third and seventh. The veneer stacking assembly 201 as indicated by the arrow so that the exposed end faces 2c, 2g of the veneer sheets in the layer are vertically aligned with the end faces 4a, 5a of the heating plates 4, 5. It is operated to move about 100mm to the left. At the same time, as shown in the figure, a fourth veneer sheet 13d having an adhesive applied to its upper surface is prepared.

The veneer sheet 13d is supplied onto the upper surface of the lower heating plate 3 in the same manner as in the case of the veneer sheet 13a, as shown in FIG. At the same time, the fifth veneer sheet 13e to which the adhesive is applied to the lower surface is prepared.

As shown in FIG. 14, the veneer sheet 13e is formed of the veneer sheet 13c such that its right end face is in contact with the exposed end face 2g of the veneer sheet in the seventh layer of the stacking assembly 201. It is fed and placed on the exposed surface 2u of the veneer sheet in the top surface and the sixth layer.

Thereafter, the heating plates 4 and 5 are hot pressed to the veneer sheets 13d and 13e to the veneer sheets which have been previously laminated under the same conditions to adhesively laminate these veneer sheets 13d and 13e to the lamination assembly 201. 15 are moved to the operating position toward each other as shown in FIG. Thus, the veneer stacking assembly 202 is constructed.

As described above with reference to the stacking of veneer sheets 13a, 13b, 13c, because the entire upper and lower adhesive application surfaces of the veneer sheets 13d, 13e are uniformly pressed against the veneer stacking assembly 201, Close adhesion can be achieved by the high temperature pressurization.

12 to 15, by repeating a series of steps similar to the above steps, the sixth and seventh veneer sheets 13f and 13g have the veneer stacking assembly 202 in the second and eighth layers. And veneer stacking assembly 203 (not shown) is formed. By repeating similar steps more, the eighth and ninth veneer sheets 13h, 13i are added to be laminated to the stack assembly 203 in the first and ninth layers, and as shown in FIG. A stacked veneer stacking assembly 204 is formed.

After the laminated veneer stacking assembly 204 is manufactured, the heating plates 4, 5 are withdrawn as shown in FIG. 17, and then the exposed end face 2d of the veneer sheet in the fourth layer and The exposed end faces 2f of the veneer sheet in the sixth layer of the veneer stacking assembly 204 are end faces 4a, 5a of the lower and upper heating plates 4, 5, respectively, as shown in FIG. The stack assembly 204 is moved in the direction of the arrow by the movement of the conveyor E to a position vertically aligned with the.

As described with reference to the first preferred embodiment, comparing FIGS. 16 and 5, the shape of the end portion of the veneer stacking assembly 204 is similar to that of the end portion of the first veneer stacking assembly 2. It can be seen that the end of the stack assembly 204 is positioned relative to the hot press in the same relationship as the end of the first substrate 1 in FIG. 1A and the hot press. Thus, lamination assembly 204 can be used as a substrate for subsequent veneer sheet lamination operations.

A series of working steps as described with reference to FIGS. 6-18 is repeated the number of times needed to produce the desired length of the LVL board or adhesive aggregate in a nine-layer configuration. The final LVL board can be cut or cut to the desired length depending on the application.

In stacking veneer sheets continuously in the same manner as described above, the end joints in the final LVL board are distributed, for example, as shown in FIG. 18. That is, the end joints are regularly staggered in the form of steps symmetrical with respect to the central fifth layer. As shown in the figure, the end joints in the first and ninth layers, the second and eighth layers, the third and seventh layers, the fourth and sixth layers are positioned in a vertical alignment. Thus, the two end joints in any two adjacent layers are not aligned with each other and are offset by a distance of about 100 mm, as a result of which the stress due to bending is not concentrated at a specific point in the board, resulting in a final LVL board. Is very strong against bending.

As will be apparent to those skilled in the art, the second preferred embodiment is advantageous in terms of work efficiency because two veneer sheets can be laminated at the same time by a single stroke high temperature press operation.

Now, a third preferred embodiment of the present invention will be described with reference to FIGS. 19 to 31.

The third embodiment is similar to the second embodiment in that two veneer sheets are laminated at the same time by a single stroke of high temperature press operation, but is designed to minimize thermal conduction to the veneer sheet to which the adhesive is applied before the high temperature press. The point is different. More specifically, the veneer sheet 13a, to which the thermosetting adhesive is applied on the upper surface, is positioned and held on the lower heating plate 4 in the second embodiment, for example, as shown in FIG. While the veneer sheet is held on the heating plate 4, heat is conducted to the veneer sheet and thus also to the adhesive. The method of the third embodiment is designed to minimize the heat conduction.

Referring to FIG. 19, veneer stacking assemblies 3 having even-layered, ie eight-layered, veneer sheets carried on a conveyor E as a first substrate, face each other and in the same manner as in the second embodiment and Shown with the lower and upper heating plates 4, 5 which can move away from each other. In the eight-layer veneer stacking assembly 3, the exposed end 3e of the veneer sheet 3n in the fifth layer protrudes outwards and in the fourth, third, second and first layers. Veneer sheets are placed inward continuously in an offset distance of about 100 mm. On the other hand, the veneer sheet in the sixth layer of the veneer stacking assembly 3 is inward from the veneer sheet 3n of the fifth layer so that the exposed end face 3f is spaced from the end face 3e at a distance of about 200 mm. And veneer sheets in the seventh and eighth layers are further inwardly disposed at an offset distance of about 100 mm to align perpendicular to the veneer sheets in the second and first layers, as shown in FIG. 19. .

Reference numeral 10 designates a veneer carrier that can move between the standby position shown in FIG. 19 and the operating position on the lower heating plate 4 shown in FIG. The veneer carrier 10 is formed of the stepped part 10b and the veneer sheet receiving surface 10a which are in a position of about 1,000 mm when measured from the right end of the carrier 10 as seen from the figure. The step portion 10b functions as a stop for positioning the veneer sheet on the receiving surface 10a. The veneer carrier 10 is preferably made of a suitable thermally conductive metal such as iron, aluminum or stainless steel.

In the initial state of the apparatus for carrying out the method of the third preferred embodiment, the heating plates 4, 5 are positioned in an inoperative position, and the veneer stacking assembly 3 is exposed to the exposed veneer sheet in the fourth layer. The end face 3d is located by the conveyor E at a position vertically aligned with the end faces 4a and 5a of the lower and upper heating plates 4 and 5, as shown in FIG. 19. The veneer sheet 14a to which the thermosetting adhesive is apply | coated on the upper surface is prepared.

In the first working step, the veneer sheet 14a is fed as indicated by the arrow onto the receiving surface 10a of the carrier 10 such that the left end of the veneer sheet 14a contacts the step 10b. 20, the 2nd veneer sheet 14b which is not apply | coated with the adhesive agent is prepared.

Thereafter, the second veneer sheet 14b is supplied and positioned on the top surface to which the adhesive of the veneer sheet 14a is applied so that the veneer sheet 14b is offset to the left by a distance of about 100 mm, as shown in FIG. do.

Subsequently, the carrier 10 is heated underneath such that the right end face of the carrier 10 and the right end face of the veneer sheet 14a are vertically aligned with the right end face of the heating plate 4, as shown in FIG. 22. It is moved as indicated by the arrow on the upper surface of the plate 4.

After the carrier 10 is positioned on the heating plate 4, the lower and upper heating plates 4, 5 are formed of the veneer sheets 14a, 14b and the veneer stacking assembly 3, as shown in FIG. 23. The protruding portion of the veneer sheet 3n is moved to pressurize at high temperature. The high temperature pressurization lasts for about 3 minutes under a pressure of about 1 MPa, as a result of which the veneer sheets 14a and 14b are adhered to the veneer stacking assembly 3 to form a veneer stacking assembly 301. As will be clear from the figure, heat from the heating plate 4 is conducted to the veneer sheets 14a, 14b via the metal carrier 10. At this high temperature pressurization, the entire surface of the veneer sheet 14a to which the adhesive is applied is subjected to uniform pressure from the heating plates 4, 5.

After 3 minutes of high temperature pressurization, the heating plates 4, 5 are withdrawn to their original position, as shown in FIG. 24, and then to the right of the veneer stacking assembly 301, as shown in FIG. 25. Conveyor E is activated to move to and carrier 10 is returned to its standby position.

As shown in FIG. 26, the 3rd veneer sheet 14c by which the adhesive agent is apply | coated on the upper surface, and the 4th veneer sheet 14d by which the adhesive agent is applied to the lower surface are prepared.

As shown in FIG. 27, the veneer sheet 14c is positioned on the carrier 10 in the same manner as the veneer sheet 14a, and the veneer sheet 14d has one end surface thereof in the stacking assembly 301. Is placed onto the stack assembly 301 so as to contact the end face 3f of the veneer sheet in the sixth layer.

Thereafter, the veneer stacking assembly 301 is arranged such that the exposed end face 3c of the veneer sheet in the third layer is vertically aligned with the end face 4a of the lower heating plate 4, as shown in FIG. The carrier 10, which is moved by the conveyor E to the position and supports the veneer sheet 14c on the upper side, is moved on the upper surface of the heating plate 4.

The heating plates 4, 5 are operated to move toward each other to hot press the veneer sheets 14c, 14d to adhere to the stacking assembly 301 under the same conditions, as shown in FIG. 29. . Thus, a laminated veneer stacking assembly 302 is formed.

Although not shown in the figures, after the heating plates 4, 5 have been moved to the retracted position, the end faces 3b, 3g of the veneer sheets in the second and seventh layers of the stacking assembly 302 are heated plates. The 5th veneer sheet 14e which is vertically aligned with the end surface 4a of (4), to which the adhesive agent is apply | coated on the upper surface, and the 6th veneer sheet 14f to which the adhesive agent is applied to the lower surface is veneer sheet 14c. The veneer stacking assembly 302 is moved by the conveyor E so as to be laminated to the stacking assembly 302 in the same manner as described above with reference to 14d) to provide a veneer stacking assembly 303 (not shown). .

In FIG. 30, veneer stacking assembly 303 (not shown) has exposed end faces 3a, 3g of veneer sheets in the first and eighth layers of stacking assembly 303 of the heating plate 4. The lamination assembly in the same manner as described above is the seventh veneer sheet 14g vertically aligned with the end face 4a and the adhesive applied to the upper surface and the eighth veneer sheet 14h with the adhesive applied to the lower surface. It is moved to the left position to 303. Thus, a laminated veneer stacking assembly 304 is formed as shown in FIG.

After the lamination assembly 304 is formed, the heating plates 4 and 5 are withdrawn and the assembly 304 is exposed to the exposed end face 3d of the veneer sheet in the fourth layer, as shown in FIG. It is moved to the right by the conveyor E to a position vertically aligned with the end face 4a of the lower heating plate 4. That is, the veneer stacking assembly 304 is located at a position corresponding to the position of the first stacking assembly 3 relative to the heating plates 4, 5 of FIG. 19.

The series of working steps described in FIGS. 20-31 is repeated the number of times needed to fabricate an 8-layer configuration of an LVL board to a desired length.

In each of the three different embodiments, the heating plates 4, 5 are sized to press only the entire surface of a single veneer sheet, for example, as shown in FIGS. 3B, 15 and 29. . For example, in the case of FIG. 29, the lower heating plate 4 presses the entire surface of the veneer sheet 14c through the carrier 10, and the upper heating plate 5 is the entire surface of the veneer sheet 14d. Is in direct pressure contact with The pressurization heats the outer surface of each veneer sheet 14c, 14d to a high temperature, so that some of the heat in the veneer sheets is when the veneer sheet 14e, 14f is positioned above the heated surface. , 14f). That is, the veneer sheets 14e and 14f are not only heated by the heating plates 4 and 5, but also receive some heat from the preheated pressurized veneer sheets 14c and 14d. This heating contributes to the curing of the adhesive on the veneer sheets 14e and 14f. However, it should be noted that the area indicated by reference S in FIG. 29 is not heated as much as the outer surface of the veneer sheets 14c and 14d. Therefore, the part of the adhesive applied on the veneer sheets 14e and 14f in contact with the heated surface of the veneer sheets 14c and 14d is less than the remaining adhesive applied on the same veneer sheets in contact with the area S. Cures quickly. That is, the residual adhesive layers need a longer time to cure sufficiently to the desired adhesive strength. In order to produce the product with the desired strength, it is preferred that the entire adhesive applied on each veneer sheet is hot pressed for complete curing of the adhesive. For this purpose, it is necessary to keep the heating plates 4 and 5 in an operating state for a long time until the adhesive in contact with the region S is sufficiently cured. However, this only extends the compression time and reduces the working efficiency of the device.

A fourth embodiment of the present invention described below with reference to Figs. 32-45 is considered to avoid the above drawbacks.

Referring to FIG. 32, there is shown a first veneer stacking assembly 6 in a 9-layer configuration arranged in the same manner as the first veneer stacking assembly 2 of FIG. 5 for a second preferred embodiment. Although not shown, the veneer stacking assembly 6 is supported on a reciprocating conveyor E.

Reference numerals 7 and 8 designate a pair of lower and upper heating plates that can move towards and away from each other in the same way as the heating plates 4 and 5 of the second and third embodiments. The lower heating plate 7 has an L-shaped longitudinal cross section as shown in FIG. 32, a veneer sheet receiving surface 7b adjacent to the right end surface 7a and a rising surface 7c adjacent to the left end. It is provided. A vertical step surface 7d is formed between the receiving surface 7b and the rising surface 7c. The receiving surface 7b has a length L1 of about 1,100 mm corresponding to the sum of the offset distance between the two end joints of any two adjacent layers of veneer sheets in the veneer stacking assembly 6 and the veneer sheet length 1,000 mm. Has The rising surface 7c has a length L2 of about 100 mm, and the height of the step surface 7d is about 4 mm corresponding to the thickness of the veneer sheet. The heating plate 7 is heated to about 190 ° C. by steam or electric heaters. The upper heating plate 8 has substantially the same structure as the heating plate 7, is heated to the same temperature, and has the surfaces 8b, 8c, 8d corresponding to the surfaces 7b, 7c, 7d. However, the lower heating plate 7 is disposed in an inverted state. That is, these heating plates 7, 8 are arranged symmetrically with respect to an imaginary horizontal plane passing through the center of the veneer sheets in the fifth layer of the stacking assembly 6.

In the initial state of the apparatus for carrying out the method of the fourth embodiment, the lower and upper heating plates 7, 8 are located in their withdrawn positions, and the first veneer stacking assembly 6 is shown in FIG. 32. , The exposed ends 6c, 6g of the veneer sheets in the third and seventh layers are positioned in a vertical alignment with the end faces 7a, 8a of the heating plates 7, 8. The veneer sheet 15a to which the thermosetting adhesive is apply | coated on the upper surface is prepared.

In the first step, the veneer sheet 15a is indicated by an arrow on the receiving surface 7b of the lower heating plate 7 such that its left end surface is in contact with the vertical step surface 7d, as shown in FIG. As supplied. At the same time, the second veneer sheet 15b to which the adhesive is not applied is prepared.

The lower heating plate 7 is then exposed to the exposed end of the veneer sheet in the fourth layer of the veneer stacking assembly 6 with the right end face of the veneer sheet 15a on the heating plate 7 as shown in FIG. 34. It is raised to contact the bottom surface 6d.

The second veneer sheet 15b then has a right end surface of the veneer sheet 15b with the exposed end surface 6e of the veneer sheet in the fifth layer of the stacking assembly 6, as shown in FIG. The upper surface of the veneer sheet 15a and the surface 7c of the heating plate 7 are placed and brought into contact with each other. The 3rd veneer sheet 15c by which the adhesive agent was apply | coated to the lower surface is prepared.

After these three veneer sheets 15a, 15b, 15c are laminated, the heating plate 8 is moved downward to hot press the veneer sheets, as shown in FIG. The high temperature pressurization lasts for about 1 minute under a pressure of about 1 MPa, thereby forming a laminated veneer stacking assembly 601. Since the effective pressurized surface area of the heating plates 7, 8 coincides with the sum of the areas of the surfaces 7b, 7c and 8b, 8c, respectively, for the heating plates 3, 5 to achieve a pressure of 1 MPa Greater force is needed.

As shown in FIG. 37, the adhesive applied veneer sheets 15a, 15c are opposed surfaces of the intermediate veneer sheet 15b and opposite surfaces of the protruding portion of the veneer sheet 6n of the veneer stacking assembly 6. Against the entire surface. At the same time, the lower and upper exposed surfaces of the veneer sheets and the respective outer surfaces of the veneer sheets 15a, 15c in the fourth and sixth layers of the veneer stacking assembly 6 are in pressure contact with the heating plates 7, 8. Is maintained and heated.

After the high temperature pressurization of about 1 minute, the two heating plates 7, 8 are withdrawn to their non-operational position, as shown in FIG. 38. Since the hot press for 1 minute is very short, the adhesive cannot be completely cured, but since the adhesion by the adhesive is strong enough to fix the veneer sheets 15a, 15b, 15c to the lamination assembly 6, these veneer sheets Are not separated from the assembly 6 when the heating plates 7, 8 are moved away from the veneer sheets. It should be noted that due to the heat conducted from the heated veneer sheets 15a, 15c, the curing of the adhesive persists even after 1 minute of high temperature pressurization. Since the exposed outer surfaces of the veneer sheets in the fourth and sixth layers of the veneer stacking assembly 601 remain in direct contact with the heating plates 7, 8, these surfaces are heated to a high temperature during the high temperature pressurization. It should be noted that At this high temperature pressurization, the projecting surfaces 7c and 8c of the heating plates 7 and 8 have no effect on the veneer sheet 15b.

After retraction of the heating plates 7, 8, the conveyor E (not shown) is exposed to the exposed end faces 6b, 6h of the veneer sheets in the second and eighth layers of the stack assembly 601. As shown at 39, it is operated to move the veneer stacking assembly 601 about 100 mm to the left as indicated by the arrow to be in vertical alignment with the end faces 7a, 8a of the heating plates 7, 8. . At the same time, as shown in Fig. 39, a fourth veneer sheet 15d having an adhesive applied to its upper surface is prepared.

Thereafter, the veneer sheet 15d is supplied as indicated by the arrow onto the receiving surface 7b of the lower heating plate 7 in the same manner as the veneer sheet 15a, and at the same time, as shown in FIG. The fifth veneer sheet 15e to which the adhesive is applied to the lower surface is prepared.

As shown in FIG. 41, the veneer sheet 15e has a right end face of the veneer sheet 15e with the exposed end face 6g of the veneer sheet in the seventh layer of the veneer sheet of the stacking assembly 601. It is supplied and placed on the heated top surface of veneer sheet 15c and on the adjacent exposed surface of the veneer sheet in the sixth layer to be in contact.

The heating plates 7, 8 are then moved to an operating position as shown in FIG. 42 to hot press under the same conditions for laminating the veneer sheets 15d, 15e to the stacking assembly 601. Thus, a laminated veneer stacking assembly 602 is constructed.

Since the lower and upper surfaces of the veneer sheets 15a and 15c and the adjacent surfaces of the veneer sheet in the same layers of the stacking assembly 601 are preheated to a high temperature by the high temperature pressurization of FIG. 37, the veneer sheets 15d and 15e The adhesive on top receives heat not only from the heating plates 7, 8 but also from the preheated surface of the veneer sheets, so that curing of the adhesive occurs more quickly than when heated under the influence of heat only from the heating plates 7, 8. Can be.

During the high temperature pressurization of FIG. 42, most of the surface of the veneer sheet 15a is pressed through the veneer sheet 15d, and the remaining surface is directly pressed by the surface 7c of the heating plate 7. Thus, the progress of curing of the adhesive applied on the veneer sheets 15a and 15c occurs during the high temperature pressurization of FIG. 42, as a result of the veneer sheet 15b in the middle and the veneer sheet in the original lamination assembly 6. Desired adhesion of veneer sheets 15a and 15c to a portion can be successfully achieved.

As indicated with reference to FIG. 37, the exposed outer surfaces of the veneer sheets in the third and seventh layers of the veneer stacking assembly 601 are in direct contact with the heating plates 7, 8, so that these outer surfaces are maintained. Are heated to high temperature during the 1 minute high temperature pressurization of FIG.

After 1 minute of high temperature pressurization, the heating plates 7 and 8 are withdrawn to their non-operational position, and the veneer stacking assembly 602 is moved to the left by a predetermined distance (not shown), in the same manner as above. A pair of veneer sheets 15f and 15g are then added for lamination to form a laminated veneer lamination assembly 603 (not shown). In addition, the lamination of another pair of veneer sheets 15h and 15i is also performed in the same manner, and the laminated veneer stacking assembly 604 is thus formed as shown in FIG.

Since the outermost veneer sheets 15h and 15i are hot pressed by a single stroke hot pressing operation, for these adhesives on the veneer sheets to be sufficiently cured, the hot pressing in FIG. 43 to constitute the stack assembly 604 is performed. It should be noted that should last at least 1 minute, for example 3 minutes.

After 3 minutes have elapsed, the heating plates 7, 8 are withdrawn as shown in FIG. 44. The conveyor E (not shown) then exposes the exposed end face 6c of the veneer sheet in the third layer of the veneer stacking assembly 604 and the exposure of the veneer sheet in the seventh layer of the assembly 604. 45, respectively, moves the stack assembly 604 in the direction of the arrow to a position where the end faces 6g are vertically aligned with the end faces 7a and 8a of the lower and upper heating plates 7 and 8, respectively. It works to The end portion of the veneer stacking assembly 604 serves as the end of the new substrate for further stacking of veneer sheets.

The series of working steps described with reference to FIGS. 33-45 is repeated the number of times needed to produce a nine-layer LVL board to the desired length.

As will be apparent from the above description, the fourth embodiment is characterized in that a part of the surface of the veneer stacking assembly corresponding to the area S indicated in FIG. 29 and the entire surface of the veneer sheet pair adjacent to the area S are hot. Since it can be heated by pressing, the next veneer sheet to be laminated is advantageous over the previous embodiments in that it can be further heated by heat conducted from the pre-laminated veneer sheets. Thus, the high temperature pressurization time can be advantageously shortened.

Various modifications according to the present invention are described below.

Modifications are described with reference to FIGS. 46-48. Referring to FIG. 46, a first veneer stacking assembly 9 in a nine-layer configuration is shown. The stacking assembly 9 is similar to the assembly 2 shown in FIG. 5, but differs with respect to the staggered arrangement of the individual veneer sheets. That is, the offset distance between any two adjacent exposed end faces of the veneer sheets in the first to fifth and sixth to ninth layers of the veneer stacking assembly 9 is about 100 mm, but the fifth and the fifth The offset distance between the exposed end faces 9e and 9f of the veneer sheets in the sixth layer is about 150 mm. By arranging the individual veneer sheets of the lamination assembly 9 as described above, the alignment of the end joints of the end LVL boards in the thickness direction can be prevented, so that stress concentration of the LVL boards under bending can be avoided and As a result, the overall product strength is increased.

The apparatus for carrying out this method has a lower heating plate 16 and an upper heating plate 17. The lower heating plate 16 has an upper surface 16b having a longitudinal size of about 1,100 mm, a concave surface 16c having a longitudinal size of about 50 mm, and a height of about 4 mm corresponding to the veneer sheet thickness. It has a vertical step surface 16d. On the other hand, the upper heating plate 17 has a lower surface 17b having a longitudinal size of about 1,100 mm, a protruding surface 17c having a longitudinal size of about 50 mm, and a vertical step surface 17d of about 4 mm. do. These heating plates 16, 17 are arranged one above the other with the right end faces 16a, 17a vertically aligned with each other and heated to the same temperature in the same manner as in the previous embodiments.

FIG. 46 shows an initial state of the apparatus for carrying out the method, wherein the two heating plates 16, 17 are respectively positioned in their withdrawn positions and are supported on the conveyor E, veneer stacking assembly 9. Is positioned at the position where the exposed end face 9g of the veneer sheet in the seventh layer is vertically aligned with the respective end faces 16a and 17a of the lower and upper heating plates 16 and 17.

Although the detailed description is omitted, the three veneer sheets 12a, 12b, 12c are laminated, hot pressed by the heating plates 16, 17, and thus laminated veneer stacking assembly, as shown in FIG. 901 is formed. The stacking arrangement of the veneer sheets 12a, 12b, 12c immediately before the hot pressing may be performed using a similar sequence of steps as described with reference to FIGS. 33 to 36 in the fourth embodiment. In veneer stacking assembly 901, veneer sheets 12a, 12b, 12c have their end faces exposed end faces 9d of veneer sheets in the fifth, sixth and seventh layers of assembly 9. , 9e, 9f, are laminated to the previous veneer stacking assembly 9.

At this high temperature pressurization, the entire inner adhesive application surface of each veneer sheet 12a, 12c is hot to the projecting portions of the veneer sheet and the opposing surfaces of the intermediate veneer sheet 12b in the fifth layer of the stacking assembly 9. Is pressurized. At the same time, the entire outer surface of each of the veneer sheets 12a and 12c and the exposed top surface of the veneer sheet in the sixth layer of the veneer stacking assembly 9 and the exposed bottom surface of the veneer sheet in the fourth layer are Pressurized contact with the heating plates 16, 17 is maintained.

48 shows the veneer stacking assembly in a position where the exposed end face 9h of the veneer sheet in the eighth layer of the stack assembly 901 is vertically aligned with the end faces 16a, 17a of the heating plates 16, 17. 901 has already been moved to the left, and the fourth and fifth veneer sheets 12d and 12e are hot pressed for lamination to the veneer stacking assembly 901. During the high temperature pressurization, the adhesive application surfaces on the veneer sheets 12d and 12e receive heat not only from the heating plates 16 and 17 but also from the surfaces of the preheated veneer sheet. The veneer stacking assembly thus stacked is indicated at 902.

The sixth and seventh veneer sheet pairs (not shown) for the second and eighth layers and the eighth and ninth veneer sheet pairs (not shown) for the first and ninth layers are laminated in the same manner as above. And a nine-layer veneer stacking assembly (not shown).

This series of work steps is repeated the number of times needed to manufacture a 9-layer LVL board to the desired length.

Modifications to the second embodiment will be described later with reference to FIGS. 49 to 53.

In the second embodiment shown in Figs. 5 to 18, the first to third veneer sheets 13a, 13b, and 13c are laminated to be simultaneously hot pressurized by the heating plates 4 and 5. The variant is characterized in that the veneer sheet 13a is positioned on the lower heating plate 4, the veneer sheet 13b is positioned on the sheet 13a, and two veneer sheets are shown in FIG. It differs from the second embodiment in that it forms a laminated veneer stacking assembly 201 'by hot pressing as shown in FIG. After the heating plates 4, 5 are withdrawn as shown in FIG. 51, the third veneer sheet 13c is top surface of the veneer sheet 13b and the veneer stacking assembly as shown in FIG. 52. It is located on the exposed top surface of the veneer sheet in the fifth layer of 201 '. After the third veneer sheet 13c is positioned, as shown in Fig. 53, the heating plates 4, 5 are operated to hot press the three veneer sheets 13a, 13b, 13c, and thus lamination. Veneer stacking assembly 202 'is constructed.

54-63, a modification to the third embodiment of Figs. 19-31 is described. The variant differs from the third embodiment in that a plurality of veneer sheets, ie two sheets in the illustrated variant, are added successively for each layer.

In FIG. 54, the lower and upper heating plates 4 ′ and 5 ′ have a longitudinal size corresponding to substantially twice the length of the veneer sheet, ie about 2,000 mm. The veneer carrier 10 'is similar in shape to the carrier 10 shown in FIG. 19, but its veneer sheet receiving surface has substantially the same length as the heating plates 4' and 5 '. In the initial state of the apparatus for carrying out the method of this embodiment, the heating plates 4 ', 5' and the veneer carrier 10 'are located in their withdrawn positions, and the veneer stacking assembly 3 is in the fourth layer. By the conveyor E (not shown) at a position where the exposed end face 3d of the veneer sheet of the sheet is vertically aligned with the end faces 4'a, 5'a of the heating plates 4 ', 5'. Is located. As shown in FIG. 54, two veneer sheets 14a and 14a 'are prepared which are arranged side by side with a thermosetting adhesive applied to the upper surfaces.

The veneer sheets 14a and 14a 'are shown by arrows on the receiving surface of the carrier 10' such that the left end of the veneer sheet 14a 'contacts the steps of the carrier 10', as shown in FIG. A second set of two veneer sheets 14b, 14b 'which are supplied as indicated and which are not coated with an adhesive at the same time is prepared. Thereafter, the second set of veneer sheets 14b and 14b 'are fed onto the top surface of the adhesive coated veneer sheets 14a and 14a' in a staggered manner with an offset distance of about 100 mm, as shown in FIG. Is located.

Then, as shown in FIG. 57, the carrier 10 ′ has a right end face 4 of the carrier 10 ′ and a right end face 4 of the veneer sheet 14a having the right end face 4 of the heating plate 4 ′. It is moved as indicated by the arrow on the upper surface of the lower heating plate 4 'to be vertically aligned with' a).

After the carrier 10 'is positioned on the heating plate 4', the lower and upper heating plates 4 ', 5' are placed on veneer sheets 14a, 14a for lamination to the first veneer stacking assembly 3. 'And 14b, 14b') are moved towards each other to hot press. The high temperature pressurization lasts for about 3 minutes under a pressure of about 1 MPa. As a result, the veneer sheets are bonded to the veneer stacking assembly 3, thereby forming a stacked veneer stacking assembly 301 ', as shown in FIG.

After the high temperature pressurization is completed, the heating plates 4 ', 5' are moved to their retracted position, as shown in Figure 59, and then the carrier 10 'is shown in its original position, as shown in Figure 60. Returning to position, the veneer stacking assembly 301 'is moved to the right by conveyor E (not shown). Third and fourth sets of veneer sheets 14c, 14c 'and 14d, 14d' are prepared, with the adhesive applied to the upper and lower surfaces, respectively.

The veneer sheets 14c and 14c 'are positioned on the carrier 10', and the veneer sheets 14d and 14d 'have the right end face of the veneer sheet 14d as shown in FIG. It is positioned onto the stack assembly 301 'to contact the exposed end face 3f of the veneer sheet at the sixth layer of 301'. Thereafter, the veneer stacking assembly 301 'is vertically aligned with the end face 3c of the veneer sheet in the third layer with the end face 4'a of the lower heating plate 4', as shown in FIG. Is moved by conveyor E (not shown), and carrier 10 'is moved onto the top surface of heating plate 4'. The heating plates 4, 5 are then pressed together to bond the two sets of veneer sheets 14c, 14c 'and 14d, 14d' to the lamination assembly 301 'as shown in FIG. It is operated to move toward, resulting in a laminated veneer stacking assembly 302 ′.

A series of work steps similar to those described with reference to FIGS. 55-63 are repeated the number of times needed to fabricate the LVL board to the desired length.

This embodiment is advantageous in terms of lamination efficiency because two veneer sheets can be added for lamination to each layer of the lamination assembly or substrate by a single stroke hot pressing operation.

64 to 68, a variation on the first preferred embodiment will now be described. Unlike the first embodiment in which a single veneer sheet such as 11b, 11c, etc. is laminated during each hot pressing operation, according to the modification, a plurality of veneer sheets are laminated in sequence during a single hot pressing operation.

Referring to FIG. 64, the first veneer sheet 18a is positioned on the lower heating plate such that its right end face is in contact with the end face 40a of the veneer sheet at the first layer of the first veneer stacking assembly 40. do. Thereafter, the second veneer sheet 18b is laminated to contact the end face 40b of the veneer sheet in the second layer of the veneer stacking assembly 40, as shown in FIG. Four veneer sheets 18c and 18d are further added such that their right end faces contact the exposed end faces 40c and 40d of the veneer sheets in the third and fourth layers, respectively, as shown in FIGS. 66-67. do. After the four veneer sheets have been stacked, the movable top heating plate 20 is lowered to hot press to simultaneously laminate the veneer sheets to the stack assembly 40, as shown in FIG. To this end, the top movable heating plate 20 is formed to match the staggered shape of the laminated veneer sheets. The high temperature pressurization is performed under a pressure of about 1 MPa for about 3 minutes, thereby forming a laminated veneer stacking assembly 11. For the veneer sheets of the remaining fifth to eighth layers, one veneer sheet may be added for each hot press working stroke.

While the invention has been illustrated and described with reference to specific embodiments, it should be understood that the invention can be variously modified and modified without departing from the spirit and scope of the invention as illustrated below.

In the above embodiments, each veneer sheet is arranged such that its end face is in contact with a similar end face of an adjacent veneer sheet in the same layer of the veneer stacking assembly. The scope of the invention is not limited to such veneer sheet arrangements, as shown in FIG. 69, with a space P1 between any two adjacent veneer sheets in each layer of the laminate assembly or finished product. It may be stacked. Depending on various conditions, the space P1 may be provided in a range of about 3 mm to 10 mm. As is known to those skilled in the art, adhesives used for wood lamination contain formaldehyde harmful to the human body. When the space P1 is provided to the adhesive aggregate, formaldehyde contained in the adhesive is released to the atmosphere more rapidly than the aggregate without the space P1. The adhesive aggregate or LVL board having the space formed therein can be advantageously used as an interior building or structural member.

In the above-described embodiments, veneer sheets having a thickness of about 4 mm are laminated to end joints arranged in a staggered arrangement with an offset distance of about 100 mm. The offset distance should be substantially as long as possible to disperse the end joint in any two adjacent layers to increase the strength to bending of the final board. With regard to the strength required for the adhesive aggregate or LVL board, the lowest acceptable range of offset distances should be 5 to 20 times the thickness of the veneer sheet.

It should be noted that the method of the present invention is not limited to the use of veneer sheets having opposing ends cut perpendicular to the top and bottom surfaces of the veneer sheet. Referring now to FIG. 70, which shows a single sheet of veneer 19, the veneer sheet has both ends obliquely cut or obliquely processed in the same direction with respect to its upper and lower surfaces. FIG. 71 shows a portion of an LVL board manufactured using multiple veneer sheets 19 stacked together in an arrangement similar to the first preferred embodiment. As shown in FIG. 71, the end of each veneer sheet 19 is composed of overlapping joints. That is, one inclined end face of the veneer sheet is positioned in an overlapping relationship over the inclined end face of the other veneer sheet.

As shown in Fig. 72 showing another modified embodiment of the present invention, one layer of veneer sheet for lamination may be composed of a plurality of veneer sheets. For example, the single veneer sheets 11b in FIG. 2A each have a thickness of about 2 mm and are bonded together by a thermosetting adhesive, as shown in FIG. 11b-1, 11b-2).

In addition, the at least one veneer sheet constituting the adhesive aggregate may be replaced with wood having substantially the same thickness as the individual veneer sheets produced by processes other than peeling or slicing, for example sawing.

Further, the present invention does not limit the structure of the adhesive aggregate to placing wood, such as veneer sheets, in the adhesive aggregate such that the wood grain of each veneer sheet extends along the length of the product, wherein at least one wood sheet is The wood grains may be arranged so that they are oriented in a relationship perpendicular to the length of the product.

The present invention is good in terms of equipment cost, and adhesion failure is not caused by pressing the heating plate to adhere the entire surface of the veneer sheet which is overlaid through a thermosetting adhesive.

1A-1C, 2A-2C, 3A-3C, and 4A-4B are schematic explanatory diagrams showing a first embodiment of the present invention.

5 to 18 are schematic explanatory diagrams showing a second embodiment of the present invention.

19 to 31 are schematic explanatory diagrams showing a third embodiment of the present invention.

32 to 45 are schematic explanatory diagrams showing a fourth embodiment of the present invention.

46 to 48 are schematic explanatory views showing a modified embodiment according to the present invention.

49 to 53 are schematic explanatory diagrams showing a modification of the second embodiment.

54 to 63 are schematic explanatory diagrams showing a modification of the third embodiment.

64 to 68 are schematic explanatory diagrams showing a modification of the first embodiment.

69 is a schematic explanatory diagram showing a modified embodiment of the present invention.

70 and 71 are schematic explanatory views showing another modified embodiment of the present invention.

72 is a schematic explanatory diagram showing another modified embodiment of the present invention.

73 is a schematic explanatory diagram showing a conventional LVL manufacturing apparatus as one example of an adhesive aggregate material.

Explanation of symbols on the main parts of the drawings

1 veneer laminated assembly 3 lower plate

5: upper plate E: conveyor

Claims (20)

In a method for producing an adhesive aggregate material comprising a plurality of wood sheets each having a predetermined length, width and thickness, laminated together by a multilayer board of continuous laminated glue laminated material by hot pressing using a thermosetting adhesive. , A first substrate having an end is provided, wherein the continuous length of adhesive aggregate board is formed extending longitudinally from the end, the ends of the first substrate being shorter than the length of the wood sheet crossing in a line. Formed in a row of steps comprising a horizontal plane having a directional size and a surface formed obliquely to the horizontal plane, the spacing between any two adjacent horizontal planes across the thickness of the substrate being equal to the thickness of the wood sheet And wherein the wood sheets in each of the layers of the adhesive aggregate board adjacent the end of the first substrate are positioned so that their one ends are disposed in a face-to-face relationship with respect to each of the surfaces that are formed obliquely with respect to the horizontal plane. The first and second sheets of wood have their ends arranged in a staggered arrangement similar to the one-step staircase configuration. Is laminated on the adhesive laminated wood board to be separated from the material, Hot press by a hot press to laminate at least one wood sheet, the hot press having a pair of plates from which at least one plate is heated, each plate being effective to cover the entire surface of the wood sheet With a press area, the board of adhesive adhesive in progress is such that the entire top surface of the at least one wood sheet is pressed from the top by one of the plates while the entire bottom surface of the at least one wood sheet is applied to the other plate. And at a position supported from the bottom thereof, the adhesive aggregate material being positioned and maintained for a predetermined period of time with an adhesive layer interposed between the surfaces of the at least one wood sheet and the wood sheet adjacent thereto. 2. The method of claim 1, wherein the angle to the horizontal plane is at right angles, and the one row of stairs at the end of the first substrate includes the horizontal and vertical planes intersecting in a line having a height equal to the thickness of the wood sheet. Wherein each wood sheet has opposing ends cut at right angles through its thickness. 3. The method of claim 2 wherein each wood sheet in each layer of the adhesive aggregate board is disposed such that its ends contact the ends of adjacent wood sheets within the same layer. 3. The adhesive according to claim 2, wherein the wood sheets in each layer of the adhesive aggregate board are arranged to form a space of a predetermined size between any two opposing end faces of any two adjacent wood sheets in each layer. Aggregate manufacturing method. The wood sheet of claim 1, wherein each of the wood sheets has opposing ends that are inclined at a predetermined angle in the same direction with respect to the opposing surfaces of the wood sheet, wherein the wood sheets in each layer have their inclined ends 10. A method of making an adhesive aggregate, arranged to overlap the adjacent similarly inclined ends of the wooden sheets in each layer. The method of claim 1, wherein the first substrate is composed of a plurality of wood sheets in which the other one is assembled in multiple layers and stacked together in one in the form of an assembly having one end formed by the one-step stairs. The method of claim 1 wherein the wood sheets are laminated together with their wood grain extending predominantly along the length of the adhesive laminate board. The method of claim 1, wherein the laminated wood sheets comprise veneer sheets. The method of claim 1, wherein the at least one wood sheet comprises at least two wood sheets having a total thickness corresponding to the thickness of the wood sheet. The board of claim 1 wherein the board of adhesive gluing material in progress is characterized in that the entire top surface of at least one wood sheet maintains pressure contact with one of the plates and the entire bottom surface of the wood sheet is covered by another plate. A method of manufacturing an adhesive aggregate comprising the step of moving from the bottom to the supported position. In a method for producing an adhesive aggregate comprising a plurality of wood sheets each having a predetermined length, width and thickness, laminated together by a multi-layer board of continuous aggregate adhesive aggregate by hot pressing using a thermosetting adhesive, (a) providing the plurality of wood sheets, (b) providing a first substrate having an end portion on which the continuous length of adhesive aggregate board is formed extending, An end of the first substrate includes a first line that intersects in a row and includes a first surface that is formed at an angle to the opposite top and bottom surfaces of the first substrate and a second surface that is formed parallel to the top and bottom surfaces Formed in the step shape of the second surface having a longitudinal size smaller than the length of the wood sheet and spaced between any two adjacent second surfaces as measured across the thickness of the first substrate. The spaced interval is equal to the thickness of the wood sheet, one of the top and bottom surfaces of the first and second surfaces intersecting in line defines the outermost surface of the end of the first substrate, (c) providing a hot press comprising a pair of plates each having an effective pressurized area capable of covering the entire surface of the wood sheet, the at least one being heated, the other being disposed on one; (d) a wood sheet of one of said at least two wood sheets is positioned with one end face disposed in a face-to-face relationship with said outermost first surface of said first substrate, with one end face being said outermost At least two wood sheets relative to the first substrate in an offset arrangement in which the other one of the at least two wood sheets is positioned in a face to face relationship with the first surface of the first substrate adjacent the first surface. Positioning them side by side, (e) a layer of adhesive is interposed between the surfaces of said at least two wood sheets, and then for a predetermined length of time, the entire top surface of at least one wood sheet of said at least two wood sheets is said hot press. With the first substrate positioned and held relative to the plates, pressed from the top by the at least one plate of, the entire bottom surface of the at least two wood sheets supported from the bottom by the other plate, Operating the hot press for hot press to laminate the at least two wood sheets; (f) said at least one wood such that one end face is positioned in a face-to-face relationship with a first surface of said first substrate adjacent said first surface where said ends of said pre-laminated wood sheets are located in face-to-face relationship; Positioning at least one wood sheet on the pre-laminated wood sheets in the offset relationship at which the sheet is located; (g) a layer of adhesive is interposed between one surface of the at least one wood sheet and the mating surface of the pre-laminated wood sheets, and then for a predetermined length of time, the entire top of the at least one wood sheet The first substrate is positioned with respect to the plates, wherein a face is pressed from the top by the at least one plate of the hot press and the entire bottom face of the at least one wood sheet is supported from below by another plate. In a maintained state, operating the hot press for hot press to laminate the at least one wood sheet; (h) repeating steps (f) and (g) until the total thickness of the laminated wood sheets reaches the thickness of the first substrate, An ongoing adhesive aggregate board is formed having an end portion similar to the end of the first substrate, the end portion of the ongoing adhesive aggregate board is considered as a substrate for subsequent lamination, (i) repeating steps (d) to (h) as many times as necessary until the adhesive aggregate board has a desired length. In a method for producing an adhesive aggregate comprising a plurality of wood sheets each having a predetermined length, width and thickness, laminated together by a multi-layer board of continuous aggregate adhesive aggregate by hot pressing using a thermosetting adhesive, (a) providing the plurality of wood sheets, (b) providing a first substrate having an end portion on which the continuous length of adhesive aggregate board is formed extending, An end portion of the first substrate includes a first surface that is intersected in a row, a first surface that is formed at an angle to the opposed top and bottom surfaces of the first substrate, and a second surface that is formed parallel to the top and bottom surfaces. Formed in the form of a staircase of rows, the second surface having a longitudinal size less than the length of the wood sheet and spaced between any two adjacent second surfaces as measured across the thickness of the first substrate. The spacing is equal to the thickness of the wood sheet, one intermediate first surface of the first and second intersecting lines arranged to define the outermost surface of the end of the first substrate, the second Surfaces are formed above the intermediate first surface facing upwards and the first surfaces are formed below the intermediate first surface facing downwards, (c) providing a hot press comprising a pair of heating plates each having an effective pressurized area that can cover the entire surface of the wood sheet, the other being disposed one on top of the other; (d) a wood sheet of one of said at least two wood sheets is positioned with one end face positioned in a face-to-face relationship with said intermediate first surface of said first substrate, with one end face being said intermediate first Positioning at least two wood sheets side by side with respect to the first substrate in an offset arrangement in which the other one of the at least two wood sheets is positioned in a face-to-face relationship with the first surface of the first substrate adjacent the surface Making a step, (e) a layer of adhesive is interposed between the surfaces of the at least two wood sheets, and then for a predetermined length of time, the entire top surface of at least one wood sheet of the at least two wood sheets is the heating plate. At least in the state in which the first substrate is positioned and held relative to the plates, pressed from the top by one of them, the entire bottom surface of the at least two wood sheets being supported from below by another heating plate. Operating the hot press for hot press to laminate two wood sheets; (f) said at least one wood such that one end face is positioned in a face-to-face relationship with a first surface of said first substrate adjacent said first surface where said ends of said pre-laminated wood sheets are located in face-to-face relationship; Positioning at least one wood sheet on the pre-laminated wood sheets in the offset relationship to the pre-laminated wood sheets, where a sheet is located; (g) a layer of adhesive is interposed between one surface of the at least one wood sheet and the mating surface of the pre-laminated wood sheets, and then for a predetermined length of time, the entire top of the at least one wood sheet A surface is pressed from the top by one of the heating plates, and the first substrate is positioned and held relative to the plates, wherein the entire bottom surface of the at least one wood sheet is supported from below by the other heating plate. Operating the hot press for hot pressing to laminate the at least one wood sheet; (h) repeating steps (f) and (g) until the total thickness of the laminated wood sheets reaches the thickness of the first substrate, An ongoing adhesive aggregate board is formed having an end portion similar to the end of the first substrate, the end portion of the ongoing adhesive aggregate board is considered as a substrate for subsequent lamination, (i) repeating steps (d) to (h) as many times as necessary until the adhesive aggregate board has a desired length. 13. The method of claim 11 or 12, wherein the angle at which the first surface is formed with respect to the opposing top and bottom surfaces of the first substrate is at right angles, each of the first surfaces at the end of the first substrate. Is formed perpendicular to the second surfaces. 14. The method of claim 13 wherein each wood sheet in each layer of the adhesive aggregate board is disposed such that its ends contact the ends of adjacent wood sheets within the same layer. 14. The method of claim 13, wherein the wood sheets in each layer of the adhesive aggregate board form a space of a predetermined size between any two opposing end faces of any two adjacent wood sheets in each layer. A method of producing an adhesive aggregate disposed so as to. 13. The wood sheet according to claim 11 or 12, wherein each wood sheet has opposing ends processed to be inclined at an angle in the same direction with respect to the opposing surfaces of the wood sheet, and the wood sheets in each layer are their inclined. 10. A method of making an adhesive aggregate, wherein the processed ends are arranged to overlap the adjacent similarly inclined ends of the wood sheets in each layer. The adhesive aggregate material according to claim 11 or 12, wherein the first base material is formed of a plurality of wood sheets, one of which is assembled in a multi-layer and stacked together with one another in the form of an assembly having one end formed by the one-step stairs. Manufacturing method. 13. The method of claim 11 or 12, wherein the wood sheets are laminated together with their wood grains extending predominantly along the length of the adhesive aggregate board. 13. The method of claim 11 or 12, wherein the laminated wooden sheets comprise veneer sheets. 13. The method of claim 11 or 12, wherein said at least one wood sheet is comprised of at least two wood sheets having an overall thickness corresponding to the thickness of the wood sheet.