JPH0342163B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides that all the veneer bodies constituting a characteristic lamination mode of a plurality of veneer veneers constituting each layer of plywood (hereinafter referred to as veneer veneers) are arranged in the fiber direction. Parallel plywood made by laminating and gluing two parallel sheets, etc.
This article relates to improved versions of various types of conventional plywood. In addition,
A veneer body is a general term for a single veneer or a group of multiple veneers whose fiber directions are arranged in parallel.

Conventionally, a plywood disclosed in Japanese Unexamined Patent Publication No. 104006/1983 is known as a plywood similar to the plywood according to the present invention.

This plywood is made by stacking and bonding all the veneers that make up the plywood one after another by a predetermined dimension in the fiber direction (although the plywood of the present invention is perpendicular to the fibers). The strength of the plywood is extremely stable even if it is manufactured in a long length using a veneer with a relatively short direction.

However, if the plywood is relatively thick,
The fiber direction of the veneer is significantly inclined relative to the plywood, and if the veneer is thin, it will not look good even if you sand or cut the front and back surfaces, and it will be difficult to repair. The disadvantage was that the difficult sawtooth shape remained.

The present invention provides an improved plywood in order to alleviate or eliminate the above-mentioned drawbacks, and the details thereof will be explained below through examples shown in the drawings.

First, regarding the structure of the plywood according to the present invention, as shown in FIG. They are laminated and bonded by shifting by a predetermined dimension in the direction perpendicular to the fibers, and are bent stepwise in the thickness direction of the plywood 2 for each of the shifted dimensions in the same direction, and extend parallel to both surfaces of the plywood 2. It is characterized by being cut to any size including the bent portion.

For example, in the example plywood shown in FIG.
A scarf cut is applied to the ends 1a and 1b in the direction perpendicular to the fibers.

FIG. 2 shows another embodiment, in which the veneer bodies constituting each layer of the plywood 2 are composed of a plurality of short veneers 21a, 21
b consists of a group of veneers 21 joined so that their fiber directions are parallel (in the front-rear direction in FIG. 2), and after laminating and bonding five veneer groups 21 in the above-mentioned relationship. , cut to any size. The left and right ends 21a and 21b of the veneer group 21 constituting the plywood 2 shown in FIG.
Unlike the veneer 1 shown in FIG. 1, no scarf cut is formed in the veneer 1.

In both examples, the ends 1a and 1b exposed on one side of the plywood 2 are positioned opposite each other, and especially in the case of the plywood shown in FIG. 1, the flatness of the plywood 2 on both sides is extremely excellent. There is.

On the other hand, in the case of the plywood shown in FIG. 2, although small concave portions remain on both sides, its flatness and aesthetic appearance are generally good, and repairs such as sealing are easy if necessary.

Of course, the presence of the small recesses can be used for aesthetic purposes, and if necessary, processing such as groove processing can be performed to form the small recesses into a recess of a desired shape.

Note that the reference numeral 21c in FIG. 2 indicates a location where the short veneers 21a and 21b are butted against each other in the direction perpendicular to the fibers, and in reality, the veneer group 21 is formed by the two short veneers 21a and 21b. It consists of

Of course, there are also other methods, such as two veneers arranged at some distance to form a single layer veneer group 1 (in this case, a tunnel is present), or a scarf gill, as well as other methods. By joining using the joining method, a single layer of veneers can be constructed from any number of veneers,
If necessary, the plywood shown in FIG. 1 and other plywood according to the present invention may be constructed.

Now, FIG. 3 shows a part of the plywood 2 using the single veneer 1 shown in FIG. 1, and the plywood 2 has a smaller displacement dimension of the veneer 1 than the embodiment shown in FIG. This figure shows a plywood board in which the ends 1a and 1b of the veneer 1 are laminated and bonded so that they overlap and face each other, thereby having small convex portions on both sides instead of the small concave portions described above.

If necessary, the small convex portions are removed by sanding, cutting, etc. as shown by the two-dot chain line, and the first
Although it is easy to improve the flatness of both sides as shown in the plywood 2 in the figure, it is also possible to seek beauty from the presence of the above-mentioned small convex portions. It can also be processed into parts.

Next, regarding Figures 4 to 7,
The figure shows the laminated state of veneers during the process of manufacturing plywood, and mainly shows the ends 1a, 1 of the veneer 1 in the direction perpendicular to the fibers.
An example of the processing mode of b and an example of the opposing relationship between the end portions 1a and 1b are displayed.

Therefore, the plywood manufactured by these methods is compressed vertically from the state shown in the figure, and is bonded and manufactured with each veneer 1 bent as described above.

In addition to the illustrated examples, combinations of the fiber orthogonal direction end 1a of the veneer 1 in any figure and the fiber orthogonal direction end 1b in other figures, or the combination of the fiber orthogonal direction end 1b of the veneer 1 in other figures, Plywood, etc. manufactured with any opposing relationship (in this application, the end portions 1a and 1b are referred to as opposing even if they are separated from each other as shown in FIG. 7 or even further apart), etc. The plywood embankment according to the present invention is appropriately selected based on the desired planarity and aesthetic appearance of the plywood surface.

Of course, general matters such as the thickness of the veneer that makes up the plywood, the position of the back crack surface, the wood species, the number of plies, the adhesive to be used, and the size of the plywood to be cut are selected based on appropriate standards.

Further, although the illustrated plywood 2 and the above-mentioned example plywood are related to the basic example plywood of the present invention, other configurations can be added to the plywood of the present invention, for example, as shown in FIG. Or plywood in which any number of other veneers are laminated and bonded on one side or both sides of the plywood shown in Figure 2 in any relationship, such as having the same fiber direction as the veneer constituting the plywood, or perpendicularly to the fiber direction. As such, plywood in a form containing the above-mentioned basic example plywood can also be provided.

This kind of plywood is the basic embodiment plywood 2
In addition to being manufactured by using one or more of these veneers and gluing other veneers or plywood, all the veneers used are laminated so that such plywood can be made, and all the veneers are laminated at once. Manufactured by gluing.

In this way, the plywood according to the present invention exists even in plywood in which veneers whose fiber directions are perpendicular to each other exist in any proportion, and furthermore, the plywood according to the present invention can also be used with various boats and other plate-like bodies. There is.

Now, what is shown in FIG. 8 illustrates a basic example of the method for manufacturing plywood according to the present invention, and the details thereof will be described below based on the diagram.

First, in the adhesive application step A, the following veneer 1 is applied to the rear end 1a of the preceding veneer 1 in the direction perpendicular to the fibers.
The front ends 1b of the fibers in the perpendicular direction are overlapped as shown in the figure, and the adhesive is applied by the spreader 3.

The adhesive is applied leaving an unapplied area on one side of the veneer 1, and in the next lamination step B,
The veneers 1 are laminated one after another while being shifted as shown in the figure, with the adhesive-unapplied portions exposed.

The laminated veneers are transported to a temporary bonding process C, which has a device that temporarily fixes the relative positions of the veneers using an intermittent or continuous cold press (not shown) or an appropriate means, and is temporarily bonded. In the next cutting step D, the material is cut to a predetermined size.

Then, in a bonding process E using an adhesive curing device (not shown) such as a hot press, the veneers are bent in stages in the thickness direction of the plywood, and from a state extending parallel to the front and back surfaces of the plywood. The bent portions are bonded together to produce plywood having the lamination mode described above.

Regarding the adhesive application step A,
As in the process example described above, when the veneer lamination step B is based on the premise that the veneers are sequentially shifted and laminated without exposing any or almost all of the adhesive applied to the veneers, In the adhesive application step A, it is necessary to apply the adhesive while ensuring a non-adhesive area having an appropriate size.

Incidentally, FIG. 10 shows a partially enlarged view of the laminated state of the veneers 1 in the lamination process B, and as shown, the edge of the end 1a in the direction perpendicular to the fibers of the top layer veneer and the edge of the bottom layer veneer are shown in FIG. In the lamination step B, in which the veneers 1 are laminated with the edge of the portion 1b in a facing relationship as shown in the figure (in this case, the facing dimension is referred to as 0), each veneer 1 is sequentially stacked with a dimension of L/N from the edge ( L: Length of the veneer in the direction perpendicular to the fibers,
N: Number of laminated layers, which is 4 in the illustrated case. ) will be exposed, and depending on the existence and degree of end processing of the veneer 1 used, as well as other reasons, the facing dimension S or
When setting S′ (preferably about 15 times or less of the thickness of the veneer used in the case of the plywood of the present invention) and facing each other, the exposed dimensions will also increase or decrease accordingly, and these exposed surfaces In order to avoid applying adhesive to the parts, it is necessary to secure areas where adhesive is not applied.

Securing such adhesive-unapplied areas can also be achieved by controlling an adhesive application device such as a spreader, curtain coater, or film adhesive supply device (when using a film adhesive).
Practically speaking, it is extremely convenient to apply the adhesive using various types of ordinary adhesive applicators with the ends 1a and 1b of the veneer 1 overlapped as shown in FIG. 9.

In this case, the overlapping length of the veneers is set based on the dimension of the exposed surface in the lamination process B described above, and l shown in the figure is the overlapping length when the above-mentioned L/N is exposed, and this l is It is approximately L/N, and when arbitrary opposing dimensions S and S' are set, the overlapping length is also increased or decreased accordingly as shown in the two-dot chain line diagram.

Of course, it is basic that the dimensions of the non-adhesive part and the dimensions of the exposed surface completely match, but in practice, the former should be slightly smaller or larger to reduce errors in each process or between the two processes. deal with.

In any case, the lamination work in the lamination process is the same, but the work of overlapping this type of veneer is shown in Figure 12.
In addition, if the process is carried out automatically, semi-automatically, or manually on a conveyor with a positioning member, such as the conveyor belt 5 having the stopper 4 shown in FIG. Can be implemented.

Furthermore, as illustrated in FIG. 11, a conveyor such as the one prepared for the adhesive application process A is driven from the drive source 7, and furthermore, a conveyor such as the one prepared for the lamination process B is driven from the same drive source 7 via the deceleration mechanism 8. If such a configuration is adopted to drive the conveyance body, each process will be extremely stably related to each other by the fixed setting of the deceleration mechanism 8, and the error between the two processes will become a fixed value.

In this case, there is no problem even if the drive source 7 is turned ON and OFF and driven intermittently, so it is easy to use an intermittent cold press in the temporary bonding process in the process shown in FIG.

In addition, if it is permissible for the adhesive applied to the veneer to be exposed during the veneer lamination process, or if the adhesive applied to the veneer is actively exposed, the adhesive application process is Adhesive is applied without properly securing an unapplied area.

For example, in the example shown in FIG. 8, an adhesive application process is configured in which the veneers 1 are sequentially supplied to the spreader 3 without overlapping them and the adhesive is applied to the entire surface of one side.

In this case, in the veneer lamination process B, the adhesive will be exposed almost continuously on the veneer exposed on one side, but this is acceptable for the plywood to be manufactured. Alternatively, it is also possible to use the exposed adhesive to bond and laminate other veneers, decorative paper, boats, etc.

Therefore, the adhesive application step A is carried out, and the desired exposure of such adhesive is carried out in the lamination step B, and other laminated materials are further laminated in the lamination step. It is also possible to proceed to the next step.

As described above, the actual configuration of the adhesive application process that embodies the plywood manufacturing method according to the present invention is determined based on the relationship with the next lamination process, and there are various examples other than the above-mentioned examples. It is composed of the following form.

In addition, the adhesive application process and the lamination process are on the same plane in addition to being connected as shown in FIG.
In some cases, the adhesive application process is provided at the upper part in the conveyance direction, and the lamination process is provided at the lower part, and the two processes are connected in a desired manner, if necessary.

Furthermore, in the example of FIG. 8, if instead of the temporary bonding process C, the bonding process E having a continuous hot press is connected to the laminating process B, the production of plywood according to the present invention can be carried out continuously, and the process can be carried out as desired. When the length is increased, cutting is performed in cutting step D.

[Brief explanation of drawings]

FIGS. 1 and 2 are perspective views showing plywood according to the present invention, FIGS. 3 to 7 are explanatory views showing the laminated state of veneers, and FIG. 8 is an explanatory view showing a method for manufacturing plywood, Figure 9 is an explanatory diagram showing the state of adhesive application;
Figure 0 is an explanatory diagram showing a partially enlarged state of lamination of veneers, Figure 11 is an explanatory diagram showing a state in which the adhesive application process and the lamination process are driven by the same drive source,
Figures 2 and 13 are perspective views showing conveyor belts for stacking veneers on each other, and in the figure, veneers 1a and 1b are shown as single veneers, 1a and 1b.
is the edge of the veneer, and 2 is the plywood.

Claims (1)

[Scope of Claims] 1. The veneer veneer body constituting each layer of plywood is composed of one veneer veneer or a group of multiple veneer veneers whose fiber directions are parallel, and the veneer veneer body is arranged in a direction perpendicular to the fibers. The plywood is laminated and bonded by shifting by a predetermined dimension, and is bent stepwise in the same direction in the thickness direction of the plywood for each of the shifted dimensions, so that it extends parallel to both surfaces of the plywood, and the bent Plywood characterized by being composed of parts cut to any size.