JPH0342166B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to plywood in which the veneer veneers (hereinafter referred to as veneers) constituting each layer of the plywood have a characteristic laminated structure, and mainly relate to the veneer veneers constituting each layer of the plywood. This invention relates to plywood which is laminated and bonded so that the fiber directions of the plates are perpendicular to each other in an arbitrary relationship. Note that the 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 shifting a predetermined dimension in the fiber direction, but if the plywood is relatively thick, the veneers The fiber direction of the plywood is significantly inclined with respect to the plywood, and on the other hand, when the plywood is thin, the front and back surfaces have poor aesthetic appearance, and it also has the disadvantage of remaining in a sawtooth shape that is difficult to repair. .

An object of the present invention is to provide an improved plywood in order to alleviate or eliminate the above-mentioned drawbacks.

The present invention will be described below with reference to Examples.

As shown in FIG. 1, a plywood 1 is made of single-ply veneers 2 and 3 as veneers constituting each layer of the plywood 1, with the fiber direction being the same in each layer, and in the other layers. The veneers 2 and 3 are offset by a predetermined dimension in a certain direction, extend parallel to both sides of the plywood 1, and are laminated and bonded so as to be bent in stages in the thickness direction of the plywood 1, and The veneers 2 and 3 of any of the layers are laminated and bonded to the veneers 2 and 3 of the other layers with their fiber directions orthogonal, and the bent portions are included in the veneers 2 and 3 of the other layers. It is characterized by being cut to size.

For example, in the example plywood 1 shown in FIG. 1, the ends 2a, 2b in the fiber direction and the ends 3a, 3b in the direction perpendicular to the fibers of each of the veneers 2, 3 are scarf cut, and the two veneers 2 are Next, one veneer 3 was laminated and bonded as shown in the figure. Further, the plywood 1 shown in FIG. 2 is made of 5-ply plywood constructed in the same manner without particularly performing such end processing.

In addition, the plywood 1 shown in FIG. 2 has a veneer body 21 constituting each layer as described later, and two short veneers 2
1a and 21b are arranged in a bonded or non-bonded state so that the fiber directions are the same.

In both examples, the end 2a or 3a is exposed on one side of the plywood 1, and the end 2 is exposed on the other side.
b or 3b are positioned so as to face each other, and especially in the case of the plywood shown in FIG. 1, the flatness of both surfaces is extremely excellent.

On the other hand, in the case of the plywood shown in Figure 2, although small recesses remain on both sides, its flatness and aesthetics are generally good, and it is possible to easily apply seals, etc. as 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.

In addition, in FIG. 2, the end 2c shows the part where the veneer 2 is butted in the fiber direction, and the end 3c shows the part where the veneer 3 is butted in the direction perpendicular to the fibers. It is essentially composed of two veneers into one veneer. Of course, there are other ways to create a single veneer, such as two veneers placed at some distance apart (in which case there is a tunnel), or scarf joints, and other connections. A single veneer may be constructed by legally joining a plurality of veneers, and the plywood shown in FIG. 1 and other plywood according to the present invention may be constructed as necessary.

Now, in the case of plywood 1, a part of which is illustrated in FIG. 3, the displacement dimension of the veneers is smaller than that of the embodiment shown in FIG. This figure illustrates a plywood board that is laminated and bonded so as to 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 the veneers during the process of manufacturing 6-ply plywood, mainly showing the end portion 2a of the veneer 2 in the fiber direction.
and 2b, and an example of the opposing relationship between the ends 2a and 2b.

Therefore, the plywood manufactured using these methods is compressed vertically from the state shown in the figure, and each veneer is bonded and manufactured in a bent state as described above. In addition to the illustrated example, a combination of the ends 2a and 2b in the fiber direction of the veneer 2 in any figure, or any opposing relationship between the ends 2a and 2b (in this application, the ends 2a and 2b) Plywood, etc. manufactured by
The plywood embankment according to the present invention is appropriately selected based on the desired planarity and aesthetic appearance of the plywood surface. Also, although not shown, veneer 3
The same applies to the ends 3a and 3b in
Furthermore, as illustrated in FIGS. 1 to 3, the same applies when the ends of the veneer 2 and the veneer 3 face each other. In addition, in addition to the examples given for the lamination ratio of the veneer 2 having the fiber direction in the same direction as the direction in which the veneers are sequentially shifted and the veneer 3 having the fiber direction in the direction orthogonal to the direction, the veneer 2 and 3 alternately every 1 or any number of veneers, or laminate 3 veneers 2 and then 1 or any number of veneers 3 to achieve the desired lamination ratio (arrangement state). can do. Of course, general matters such as the thickness of the veneers 2 and 3 that make up the plywood, the positioning of the back crack surface, the species of wood, the number of plies, the adhesive to be used, and the size of the plywood to be cut, etc. Select based on

Further, although the illustrated plywood 1 and the above-mentioned example plywood relate to the basic example plywood of the present invention, it is also possible to add another configuration to the present invention, for example, as shown in FIG. On one side or both sides of the plywood shown in Figure 2, a veneer 2 constituting the plywood,
Or, the fiber direction is the same as that of the veneer 3, or
It is also possible to provide plywood in a form that includes the above-mentioned basic example plywood, such as plywood in which an arbitrary number of other veneers are laminated and bonded in an arbitrary relationship such as perpendicular to each other.

This kind of plywood is a combination of the basic embodiment plywood 1 described above.
In addition to being manufactured by gluing other veneers or plywood together, all the veneers used are laminated to form such plywood, and all of them are glued together at once. Manufactured.

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 adhesive application process A, two veneers 2
Subsequently, the veneers 3 are arranged one at a time, and the following veneers are superimposed on the preceding veneers as shown in the figure, and adhesive is applied by the spreader 4.

The application of the adhesive is carried out by leaving a non-adhesive area on one side of the veneers 2 and 3, and in the next lamination step B, the veneers are bonded with the non-adhesive area exposed. 2 and veneer 3 are stacked one after another while shifting them as shown in the figure.

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 the thickness direction of the plywood to produce a plywood having the laminated state as described above.

Regarding the adhesive application step A,
As in the process example described above, when the front embankment is to stack the veneers while shifting them one after another without exposing any or almost all the adhesive applied to the veneers in the veneer lamination process B. 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 in the lamination process B, and as shown, the fiber direction end 2b of the top layer veneer 2 and the fiber direction end of the bottom layer veneer 2 are shown in FIG. 2a in a facing relationship as shown in the figure (in this case,
The opposing dimension is called zero. ), each veneer is laminated in order from the edge to the dimension of L/N (L: for veneer 2, the length in the fiber direction;
In the case of the veneer 3, the length in the direction perpendicular to the fibers, N:
The number of layers is 4 in the illustrated case. ) will be exposed, and depending on the presence or absence and degree of edge processing of the veneer 2 and veneer 3 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).
As shown in Figure 9, it is extremely practical to keep the ends 2a and 2b of the veneer 2 and the ends 3a and 3b of the veneer 3 in an overlapping state and apply the adhesive using various types of ordinary adhesive applicators. It's very convenient.

In this case, the overlapping length of the veneers is set based on the exposed surface dimensions 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 facing dimensions S and S' are set, the overlapping length is also set to be 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.
Furthermore, if the work is carried out automatically, semi-automatically, or manually on a conveyor with a positioning member, such as the conveyor belt 6 with the stopper 5 illustrated in FIG. 13, each process can be stably performed with extremely high dimensional accuracy. can.

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, the relationship between each process is extremely stable with uniform settings of the deceleration mechanism 8, and the error between the two processes becomes a fixed value.

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

In addition, if the adhesive applied to the veneer is allowed to be exposed during the veneer lamination process, or if the adhesive 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 constructed in which the veneers 2 and 3 are sequentially supplied to the spreader 4 without overlapping them and the adhesive is applied to the entire surface of one side.

In this case, in the lamination process B of the veneers 2 and 3, the adhesive will be exposed almost continuously on the veneers exposed on one side, but this will not be the case in the plywood to be manufactured. may be acceptable or the exposed adhesive may be applied to other veneers, decorative papers,
It is also possible to laminate and bond boards 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 specific structure 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 example. 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.
The adhesive application process may be arranged at the upper part in the conveyance direction, and the lamination process is arranged at the lower part in the conveyance direction, and the two processes may be connected in a desired form if necessary.

Furthermore, in the example of FIG. 8, if instead of the temporary bonding process C, the bonding process E having a connecting 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 long, cutting is performed in cutting step D.

As explained above, the present invention can prevent the occurrence of warping of plywood due to drying and moisture absorption, and
It has surface smoothness and sufficient plywood strength.

[Brief explanation of drawings]

FIGS. 1 and 2 are perspective views showing plywood according to the present invention, FIG. 3 is an explanatory view showing a part of another embodiment of plywood, and FIGS. 4 to 7 show the laminated state of the veneers. FIG. 8 is an explanatory diagram showing a method of manufacturing plywood,
Fig. 9 is an explanatory diagram showing the adhesive application state, Fig. 10 is an explanatory diagram showing a partially enlarged lamination state of veneers, and Fig. 11 is an explanatory diagram showing the adhesive application process and the lamination process by the same drive source. FIG. 12 is an explanatory diagram showing the state in which
FIG. 13 is a perspective view showing conveyor belts for stacking veneers on each other. In the figure, 1 is plywood, 2 and 3 are veneers constituting the veneer body, 2a, 2b, 3a, 3b. is the edge of the veneer, and l is the predetermined dimension.

Claims (1)

[Claims] 1. The veneer veneers of each layer constituting the plywood have the same fiber direction in each layer, are shifted by a predetermined dimension in a certain direction with respect to the veneer veneers of the other layers, and are The veneer veneers of any of the layers are laminated and bonded so as to extend in parallel and bend stepwise in the thickness direction of the plywood, and the fiber direction of the veneer veneers of any of the layers is orthogonal to the veneer veneers of the other layers. 1. A plywood board characterized in that the plywood is laminated and bonded together and cut to any size including the bent portion.