JP2001121508A - Method for manufacturing laminated veneers using veneers - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for manufacturing laminated veneers which are less twisted and of superior strength by using a single sheet consisting of the small pieces of rectangular or square veneers joined in a fiber direction and an orthogonal direction with the fiber direction. SOLUTION: A plurality of veneers are joined in a fiber direction into a plurality of longitudinally joined veneers and the longitudinally joined veneers are cut at a specified width and in parallel with the fiber direction to obtain a plurality of slender longitudinally joined veneers. Next, when a plurality of the slender longitudinally joined veneers are joined in an orthogonal direction with the fiber direction, at least two pieces of the longitudinally joined veneers obtained from the same longitudinally joined veneers are joined in such a state that the two pieces are half-rotated on a face in parallel with the outside/inside faces of the slender longitudinally joined veneers to obtain longitudinally and transversely joined veneers. In addition, the longitudinally and transversely joined veneers are bonded with another board material using an adhesive.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a single sheet formed by joining small pieces of rectangular or square veneer veneer (hereinafter referred to as veneer) in a fiber direction and a direction perpendicular to the fiber direction. Plywood using veneer, LVL (Laminat
ed Veneer Lumber) and the like.

[0002]

2. Description of the Related Art Conventionally, veneers used for manufacturing the above-mentioned laminated material are obtained by cutting a continuous strip-shaped veneer obtained by cutting a log with a veneer lace to a predetermined length before or after drying. The fixed-sized single plates were used, and an appropriate number of fixed-sized single plates were bonded with an adhesive.

[0003]

However, depending on the type of veneer, shrinkage due to drying, such as radiata pine, is severe, and the produced laminated material is twisted, lowering its commercial value. In the case of radiata pine, the veneer lace cuts the veneer veneer because the branches extend in all directions at the same height from the ground in the state of a tree.
As shown in FIG. 3, the nodes 32 are substantially linearly arranged in a direction perpendicular to the fiber direction. For example, a plywood manufactured using such a veneer 9 as a front plate is supported near both ends in the left / right direction with the left / right direction being the fiber direction of the veneer 9 as shown in FIG. In addition, if it bends, it breaks with relatively small force from the place where the nodes 32 are lined up,
It could not be used when strength was required. Although not intended to directly solve these problems, the applicant of the present invention disclosed in Japanese Patent Application Laid-Open No. 47-20306 previously disclosed in Japanese Patent Application Laid-Open No. After that, butted in the fiber direction, the butted narrow veneer is cut to a required constant size with an inclination of an appropriate constant angle, and then a set of butted narrow veneers cut to the above dimensions are cut. A method has been proposed in which the veneered veneer is sequentially cut so that the inclined cut surface is straight, and the veneered veneer is cut into required dimensions to form a veneer veneer. However, in the above method, as shown in FIG. 12, when the narrow veneers 107, 109, and 111 are butted in the fiber direction, for example, vertically stripped to obtain the narrow veneer W1,
Each edge 107a, 1 of the narrow veneer 107,109,111
09a and 111a are not aligned on a straight line, and the edges of the narrow narrow plate W as a whole are uneven. Therefore,
When the narrow veneers W1, 2,... Are stripped, gaps are formed between the stripped veneers due to the unevenness, which is a disadvantage of a laminated material manufactured using the stripped veneers and is a commercial value. May be lowered, and the yobagi itself may not be able to be formed.

[0004]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention comprises joining a plurality of veneers in a fiber direction to produce a plurality of longitudinally joined veneers. Cutting into a plurality of elongated longitudinally bonded veneers at a predetermined width in parallel with the fiber direction, and then when joining a plurality of these elongated longitudinally bonded veneers in a direction orthogonal to the fiber direction, from the same longitudinally bonded veneer At least two of the obtained elongated vertical bonded veneers are joined in a state where they are rotated half a turn on a surface parallel to the front and back surfaces of the elongated veneer to produce vertical / horizontal bonded veneers. And an adhesive. Also, a plurality of veneers having different lengths in the fiber direction are joined in the fiber direction to produce a plurality of longitudinally joined veneers, and then each longitudinally joined veneer is cut at a predetermined width in parallel with the fiber direction to produce a large number of veneers. When making a plurality of elongated longitudinally joined veneers in the direction perpendicular to the fiber direction,
At least two of the elongated longitudinally joined veneers obtained from the same longitudinally joined veneer are joined in a state where they are rotated by half a rotation on a surface parallel to the front and back surfaces of the elongated veneer to produce a vertically and horizontally joined veneer, The vertically and horizontally joined veneer may be bonded to another plate with an adhesive. Furthermore, when a plurality of types of veneers having different lengths in the fiber direction are bonded in the fiber direction to produce a longitudinally bonded veneer having a predetermined length, the plurality of types of veneers are bonded in different joining orders. By manufacturing a plurality of types of longitudinally bonded veneers, and then cutting each longitudinally bonded veneer at a predetermined width in parallel with the fiber direction into a number of elongated longitudinally veneered veneers, then When joining a plurality of sheets in the direction perpendicular to the fiber direction, at least two elongated longitudinally joined veneers are joined in a state adjacent to each other using elongated longitudinally joined veneers obtained from different elongated longitudinally joined veneers. A bonded veneer may be manufactured, and the vertical / horizontal bonded veneer may be bonded to another plate with an adhesive. In addition, in many veneers obtained by cutting a plurality of logs, veneers obtained by cutting the same log are joined in the fiber direction to produce a vertically joined veneer having a predetermined length, Next, each longitudinally bonded veneer is cut at a predetermined width in parallel with the fiber direction to obtain a plurality of elongated longitudinally bonded veneers, and then when a plurality of these elongated longitudinally bonded veneers are bonded in a direction perpendicular to the fiber direction,
At least two elongated longitudinally joined veneers are joined in an adjacent state using elongated longitudinally joined veneers made from veneers different from each other to produce longitudinally and laterally joined veneers. The plate may be bonded to another plate material with an adhesive.

[0005]

Next, a first embodiment of the present invention will be described. As shown in FIG. 1, a veneer race A is used to cut a radiator pine log 3 having a length of 930 mm in a fiber direction, which is supported and rotated by a spindle 1, by a cutting tool 5 to obtain a continuous strip-shaped veneer 7. The strip-shaped veneer 7 is cut at intervals of 1100 mm in a direction orthogonal to the fiber direction to produce a number of fixed-size veneers 9. Next, as shown in FIG. 2, an appropriate number of these fixed-size veneers 9 are cut at a position indicated by a dashed line where the length in the fiber direction is 880 mm from the left edge, to obtain a first veneer 11. Further, as shown in FIG. 3, the other appropriate number of the fixed length veneers 9 have a dashed line where the length in the fiber direction is 280 mm from the left edge and 580 mm in the fiber direction from the position of the dashed line. The two veneers are cut at two positions indicated by the alternate long and short dash lines to obtain a second veneer 13 and a third veneer 15.

[0006] Next, a known vertical stripping device (not shown) that cuts both ends of the veneer in the fiber direction and joins the veneer in the fiber direction is used to form a single-sized single plate having a positional relationship as shown in FIG. The board 9, the first veneer 11, and the second veneer 13 are joined in the fiber direction to form first longitudinally joined veneers 17 of each length shown in the figure. Here, the length in the fiber direction of the fixed length veneer 9a, the first veneer 11a, and the second veneer 13a after joining is shortened, but when joining the veneers with the vertical stripping device, This is for preliminarily scarf-cutting the end of the veneer. As shown in FIG. 5, each of the appropriate number of longitudinally bonded veneers 17 manufactured as described above is cut at a position indicated by a dashed line at an equal interval of 155 mm in a direction orthogonal to the fiber direction, as shown in FIG. A first elongated vertical bonded veneer 19a having a lower edge cut off, a first elongated vertical bonded veneer 19b also having an upper edge cut off, and a first elongated vertical bonded veneer having both upper and lower edges cut off. A large number of plates 19c are manufactured.

On the other hand, the fixed length veneer 9 and the third veneer 15 are joined in the fiber direction so as to have a positional relationship as shown in FIG.
The second longitudinally joined veneer 21 of each length shown in the figure is used. The reason why the length of each of the veneers 9a and 15a in the fiber direction after bonding is reduced is the same as in the case of the first vertical bonded veneer 17. Next, as shown in FIG. 7, each of the appropriate number of the second longitudinally bonded veneers 21 manufactured as described above is placed in a direction perpendicular to the fiber direction as shown in FIG.
In FIG. 5, the second elongated longitudinally joined single plate 23 whose lower edge is cut off is cut at the position indicated by the alternate long and short dash line at an equal interval of 5 mm.
a, the second elongated longitudinally joined veneer 2 also having the upper edge cut off
3b and a plurality of second elongated longitudinally joined veneers 23c whose upper and lower edges are cut off. Next, one first elongated vertical bonded veneer 19a and one first elongated vertical bonded veneer 19b,
As shown in FIG. 8, two first elongated longitudinally joined veneers 19c and two second elongated longitudinally joined veneers 23c are joined together as shown in FIG.
First, the first elongated vertically joined veneer 19a in the state of FIG.
Is rotated half a turn about the center in the left-right direction of the veneer 19a on a plane parallel to the front and back surfaces of the veneer 19a, and placed on a flat table (not shown) as shown in FIG. The first elongated vertically bonded veneer 19a is placed with the cut edge of the veneer 19a inside, that is, the upper side in FIG. Then, as shown in FIG.
The second elongated vertical joining veneer 23c is replaced with the first elongated vertical joining veneer 19c.
8, from the cut edge side, that is, from the upper side in FIG. 8, the first elongated vertically joined veneers 19 a are brought together so that there is no gap, and both are attached by a paper tape (hereinafter referred to as a gum tape) 25 coated with a rewetting adhesive. The plates 19a and 23c are joined.

Next, as shown in FIG. 9, the first elongated vertical joining veneer 19c is brought into contact with the joined second elongated vertical joining veneer 23c from the upper side in FIG. Hereinafter, as shown in FIG. 9, the first elongated vertically joined veneer 19c and the second elongated vertically joined veneer 23c are sequentially joined in the same manner, and finally the first elongated vertically joined veneer 19a is brought into the state shown in FIG. 5. 2nd elongated vertical bonded veneer 2 already bonded as it is
3c from the upper side in FIG.
5 to form the first vertical and horizontal joined veneer 27. Four steps from the bottom half a turn In joining with this adhesive tape 25, each veneer 19a,
Since the edges to be joined of 19c and 23c are edges cut as described above, they are straight without irregularities, and a gap is formed between the joined veneers as in the prior art. There is no.

[0009] Two of the first vertical and horizontal joined veneers 27 manufactured as described above are turned over from the state shown in FIG. 9 to the state shown in FIG. Using the first vertical and horizontal joined veneer 28, between the veneers 27, 28, both veneers 27,
The middle plate 29 is bonded with an adhesive in a state where the fiber direction is orthogonal to the fiber 28 to manufacture a three-ply plywood 31. This plywood 3
In FIG. 1, even if the tree species is, for example, a radiata pine, as can be seen from FIG. 9, the node 32 extends from one side edge of the first vertical and horizontal joined veneers 27, 28 to the other side edge in a direction orthogonal to the fiber direction. They do not line up continuously in a row. Therefore, as shown in FIG.
Even if a force is applied in the direction of the arrow in the direction of the arrow while supporting the vicinity of both ends of the plywood 31 as the fiber direction of 7, 28, it is not easily broken.

Further, veneers constituting a laminated material such as plywood are:
The strength in the fiber direction is utilized, and a joint formed by longitudinal joining (hereinafter referred to as a vertical joint) is formed in a direction perpendicular to the fiber direction of the veneer constituting the sheet, from one side edge to the other side edge. As shown in FIG. 1
When a force is applied as shown in 1, the joint is easily broken. However, as can be seen from FIG.
Since the vertical joining portions 33 of the vertical / horizontal joining veneer 27 are not continuous from one side edge to the other side edge in a direction orthogonal to the fiber direction of the first vertical / horizontal joining veneer 27, the force is The plywood 31 is not easily broken even if it is added.

Furthermore, even when using a veneer veneer that has a large twist when dried, such as a radiator pine, the first veneered veneer veneer cuts the veneer lace veneer into small pieces. Since it is divided into parts and the positions of each part are changed in the fiber direction and the direction perpendicular to the fiber direction, the twist is dispersed and does not increase, and the commercial value of the plywood 31 does not decrease. In the case where a veneer at a position symmetrical in the thickness direction with respect to the center in the thickness direction of the laminated material has a weak point on the same line in the thickness direction, FIG.
When it receives a force as shown in FIG. However, in the embodiment of the present invention, the two first vertical and horizontal joined veneers 27 and 28 constituting the plywood 31 are turned upside down as described above. The vertical joints 33 are not aligned on the same line in the direction, and this problem is also solved.

Next, a modified example of the present invention will be described. 1. In the first embodiment, a fixed length veneer 9 obtained by cutting with veneer lace is cut at a predetermined length in a fiber direction as shown in FIGS. Second veneer 13,
The third veneer 15 was used, but when cutting with the veneer lace A of FIG. 1, a drawing veneer was brought into contact with the rotating log 3 to obtain a veneer with a desired fiber direction. Is also good. 2. In a number of veneers obtained by cutting a plurality of logs, veneers obtained by cutting the same log are joined in the fiber direction to produce a longitudinally joined veneer having a predetermined length. Then, each longitudinally bonded veneer is cut at a predetermined width in parallel with the fiber direction to form a plurality of elongated longitudinally bonded veneers, and then when a plurality of these elongated longitudinally bonded veneers are bonded in a direction orthogonal to the fiber direction. At least two elongated longitudinally joined veneers are joined adjacently using elongated longitudinally joined veneers manufactured from veneers different from each other to produce longitudinally and laterally joined veneer, The veneer may be bonded to another plate using an adhesive.

[0013]

As described above, according to the present invention, a plurality of vertically bonded veneers are manufactured by bonding a plurality of veneered veneers in the fiber direction to a plurality of veneered veneers which are bonded to another plate material with an adhesive. Then, each longitudinally bonded veneer is cut in a predetermined width in parallel with the fiber direction to obtain a plurality of elongated longitudinally bonded veneers, and then a plurality of these elongated longitudinally bonded veneers are bonded in a direction orthogonal to the fiber direction. Since it is manufactured, the edge of the elongated longitudinally joined veneer is straight without any irregularities. Therefore, even when bonded in the direction perpendicular to the fiber direction, there is almost no gap between the elongated longitudinally bonded veneers, and the laminated material manufactured using the veneer bonded in this way has no defects.

[Brief description of the drawings]

FIG. 1 is an explanatory plan view of a first embodiment of the present invention.

FIG. 2 is an explanatory plan view of a single plate.

FIG. 3 is an explanatory plan view of a veneer;

FIG. 4 is an explanatory plan view of a bonded state of a single plate.

FIG. 5 is an explanatory plan view of a cut state of a veneer;

FIG. 6 is an explanatory plan view of a single plate joined state.

FIG. 7 is an explanatory plan view of a cut state of a veneer;

FIG. 8 is an explanatory plan view showing a joining state between a first elongated longitudinally joined single plate 19a and a second elongated vertically joined single plate 23c.

FIG. 9 is an explanatory plan view of a single plate joined state.

FIG. 10 is an explanatory plan view of a joined state of the veneers.

FIG. 11 is an explanatory side view of the plywood in a pressed state.

FIG. 12 is an explanatory plan view of a conventional technique.

[Explanation of symbols]

 1 ··· Spindle 3 ··· Log 5 ··· Blade 7 ··· Band-shaped veneer 9 ··· Standard size veneer 11 ··· 1st veneer 13 ··· 2nd veneer 15 ··· 3rd veneer 17 ··· 1st vertical joining veneer 19a ... 1st elongated vertical joining veneer 19b ... 1st elongated vertical joining veneer 19c ... 1st elongated vertical joining veneer 21 ... 2nd vertical joining veneer 23a ... 2nd Slender vertical joining veneer 23b ··· Second elongated longitudinal joining veneer 23c ··· Second elongated longitudinal joining veneer 25 ·· Gum tape 27 ··· First vertical and horizontal joining veneer 28 ··· First vertical and horizontal joining veneer 29 ··· Middle plate 31 ・ ・ 3-ply plywood 32 ・ ・ node 33 ・ ・ Vertical joint 35 ・ ・ Third vertical joint single plate 37 ・ ・ 3rd vertical / horizontal joint single plate

Claims (4)

[Claims] 1. A plurality of veneer veneers are joined in the fiber direction to produce a plurality of longitudinally joined veneer veneers, and each vertically joined veneer veneer is cut at a predetermined width in parallel with the fiber direction. When two or more of these elongated longitudinally bonded veneer veneers are joined in the direction orthogonal to the fiber direction, the elongated longitudinally bonded veneer veneer obtained from the same longitudinally joined veneer veneer is used. At least two sheets of the veneer veneer are joined in a state where they are half-turned in a plane parallel to the front and back surfaces of the elongated veneer veneer to produce a veneer veneer veneer veneer. A method of manufacturing a laminated material using veneer veneer adhered by a method. 2. A plurality of veneer veneers having different lengths in the fiber direction are joined in the fiber direction to produce a plurality of vertically joined veneer veneers. And cut in parallel to a number of elongated longitudinally bonded veneer veneers, and then when joining a plurality of these elongated longitudinally bonded veneer veneers in the direction perpendicular to the fiber direction, they are obtained from the same longitudinally bonded veneer veneer. At least two of the elongated veneered veneer veneers are joined in a state where they are rotated half a turn on a surface parallel to the front and back surfaces of the elongated veneer veneer to produce a veneer / transverse veneer veneer veneer. For manufacturing a laminated material using a veneer veneer in which a veneer is bonded to another plate with an adhesive. 3. A joining order of the plurality of types of veneer veneers when a plurality of types of veneer veneers having different lengths in the fiber direction are joined in the fiber direction to produce a vertically bonded veneer veneer having a predetermined length. A plurality of types of veneer veneer veneers are manufactured by joining differently, and then each veneer veneer veneer is cut at a predetermined width in parallel with the fiber direction to obtain a number of elongated veneer veneer veneers, Next, when a plurality of these elongated longitudinally joined veneer veneers are joined in the direction perpendicular to the fiber direction, at least two elongated longitudinally joined veneer veneers are obtained from different elongated longitudinally joined veneer veneers. A method of manufacturing a laminated material using a veneer veneer in which longitudinally and laterally bonded veneer veneers are joined by using veneers in an adjacent state, and the vertical / horizontally joined veneer veneer is bonded to another plate with an adhesive. 4. In a plurality of veneer veneers obtained by cutting a plurality of logs, veneer veneers obtained by cutting the same log are joined in the fiber direction and longitudinally joined to a predetermined length. A veneer veneer is manufactured, and then each longitudinally bonded veneer veneer is cut at a predetermined width in parallel with the fiber direction to obtain a plurality of elongated longitudinally bonded veneer veneers. At the time of joining in the direction orthogonal to the fiber direction, at least two elongated longitudinally joined veneer veneers are joined in an adjacent state using an elongated longitudinally joined veneer veneer manufactured from veneer veneers obtained from different logs. A veneer veneer veneer veneer, and bonding the veneer veneer veneer to another plate material with an adhesive.