JPS5898202A - Plywood - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a plywood in which all or a plurality of veneer veneers (hereinafter referred to as intermediate boards) constituting the plywood have a characteristic laminated layer configuration, and mainly relates to Parallel plywood made by laminating and bonding all the intermediate boards with the same fiber direction, and the fiber direction is +M? It relates to improved versions of various conventional plywoods, such as parallel plywood in a broad sense, in which most of the veneers are laminated and bonded with the fibers in the same direction, although there are -.

Conventionally, as a material similar to the plywood according to the present invention, Japanese Patent Application Laid-open No. 5
Plywood disclosed in Japanese Patent No. 1-104006 is known. This plywood is made by stacking all the veneers that make up the plywood one after another by shifting them by a predetermined size in the fiber direction, and then laminating and bonding them together.The advantage of this is that it uses medium boards with a relatively short fiber direction to make it long. Even when manufactured in an R shape, the strength of the plywood is extremely stable.

However, if the plywood is relatively thick, the fiber direction of the veneer will be significantly inclined with respect to the plywood, whereas if it is thin, the front and back sides will be sampled. ink or difficult to cut;
It also had the disadvantage of having a saw-toothed shape that remained on the front and back surfaces, which was difficult to repair.

The present invention provides a plywood that inherits the advantages described in 1. and is improved to reduce or eliminate the defects described in . That's right.

First, regarding the structure of the plywood according to the present invention, as shown in FIG. 1 and FIG. The sheets are laminated and bonded to each other by a predetermined dimension in the same direction, and are bent stepwise in the thickness direction of the plywood for each of the offset dimensions in the same direction, and extend parallel to both surfaces of the plywood. It is characterized by being cut to an arbitrary size including the bent portion.

For example, in the plywood of the embodiment shown in FIG.
The example plywood shown in the figure is a 5-ply plywood constructed as described above without any such edge processing. On both sides, the ends 1a and 1 are exposed under the force of the plywood 2.
Particularly in the case of the plywood shown in FIG. 1, the flatness of the plywood 2 is extremely excellent on both surfaces. On the other hand, in the case of the plywood shown in Figure 2, although some sections remain on both sides, its flatness is generally good, and repairs such as sealing are easy if necessary.

This improvement in flatness is achieved by bending the veneer 1 in the thickness direction of the plywood 2 for each dimension in which the veneer 1 is deviated in the m-fiber direction when the veneer 1 extends parallel to both surfaces of the plywood 2. , is achieved by the presence of the bend.

Note that the end portion 1c in FIG. 2 indicates a location where the veneers 1 are butted against each other in the fiber direction, and two veneers substantially constitute one veneer. Of course, there are other methods in which two veneers may be arranged at a certain distance to form one veneer 1, or they may be joined by a scarf joint or other joining method, and any desired method may be used. A single veneer may be composed of a plurality of veneers, and if necessary, the plywood shown in FIG. 1 and other plywood according to the present invention may be constructed.

Now, in the plywood 2, a part of which is illustrated in FIG. 3, the slender dimension of the veneer 1 is smaller than that of the embodiment shown in FIG. 2, so that the ends 1a and 1-b of the veneer 1 overlap. This figure shows a plywood board that is laminated and bonded so that they face each other, and has small protrusions on both sides instead of the above-mentioned small recesses. The small protrusions can be easily removed by means of sump ink, cutting, etc., as shown by the two-dot chain line, if necessary, to improve the flatness of both sides, as in the case of the plywood 2 in Fig. 1. However, when the small convex portion is removed, the end of the veneer 1 is exposed, albeit partially, on the surface of the plywood 2. Such plywood is produced by inverting the front and back sides of the veneer 1 constituting the plywood 2 shown in FIG. It can also be obtained by bonding.

Next, regarding FIGS. 4 to 7, the figures show the laminated state of the intermediate boards during the process of manufacturing plywood, mainly the processing mode of the fiber direction ends 1a and 1b of the veneer 1. Examples and the opposing relationship between the ends la and 1b are shown. Therefore, the plywood manufactured by these methods is pressed vertically from the state shown in the figure, and the veneer 1 is bent stepwise in the plywood thickness direction at predetermined dimensions and stretched parallel to both sides of the plywood. They will be bonded and manufactured in their existing state.

In addition to the illustrated examples, combinations of the fiber direction end 1a of the veneer 1 in any figure and the fiber direction end 1b in other figures, or any combination of the ends 1a and 1b Opposing relationship (in this application, the ends 1a and 1b are said to be facing each other even if they are separated from each other as shown in FIG. 7 or even further apart.

] The plywood according to the present invention, such as the plywood manufactured by
It is selected.

Of course, the thickness of the veneer constituting the plywood, the species of wood, the number of flies, the adhesive to be used, the size of the plywood to be cut, etc., are selected based on appropriate standards.

The plywood 2 shown in the figure is formed by laminating and bonding the plywood in a state in which it is bent stepwise in the thickness direction of the plywood and extends parallel to both surfaces of the plywood in a state where the plywood is shifted by a predetermined dimension.
, and the above-described embodiment plywood relate to the basic embodiment plywood of the present invention, but the present invention is also applicable to other plywood, for example, the plywood shown in FIG. 1 and FIG. Plywood in a form that is similar to the basic example plywood listed in L, such as plywood in which any number of other intermediate boards are laminated and bonded in any relationship, such as having the same or perpendicular fiber direction as the veneer constituting the veneer. can also be provided. This kind of plywood is made of plywood using one or more of the basic embodiment plywood 2 described in mI,
Alternatively, it is manufactured by gluing together other middle boards or plywood, or by laminating all the middle boards to be used to make such plywood, and then gluing them all together. Manufactured by In this way, the plywood according to the present invention exists even in plywood in which veneers with fiber directions perpendicular to each other exist in any proportion, and further, the plywood according to the present invention can also be used with various boards and other plate-like bodies to constitute a laminate plywood. Sometimes.

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 drawing.

First, in the adhesive application process A, m of the preceding veneer l is
At the rear end 1a in the M& direction, the fiber direction ll of the trailing veneer 1 is
1 Jt 4 parts lb are stacked as shown in the diagram, and sprayer 3
Figure out how to apply the adhesive.

The application of the adhesive is carried out by leaving a non-adhesive area on one side of the veneer 1, and in the next lamination process, the veneer 1 is sequentially coated as shown in the figure with the non-adhesive area exposed. Stack them while shifting them as shown.

The laminated veneers are subjected to intermittent or continuous cold pressing (
(not shown) and temporarily bonded.
In the next cutting process, it is cut to the specified dimensions. Then, in a bonding process E using an adhesive curing device (not shown) such as a hot press, the veneer phase W is bent stepwise in the thickness direction of the plywood and extends parallel to the front and back surfaces of the plywood. The bent parts are bonded together to produce plywood having the laminated form described above.

Regarding adhesive application step A in 1ril,
As in the process example described in 1r11, the amount of adhesive applied to the veneer in the veneer lamination process B is not at all or almost 'II.
When stacking the veneers while shifting them one after another without applying 'l=', in the adhesive application process A, the adhesive is applied while securing a cloth part of the adhesive end having an appropriate width. It is necessary to plan for coating.

Incidentally, Fig. 10 shows a partially enlarged view of the laminated state of the veneer 1 in the 4jt layer process B, and as shown, the edge of the fiber direction end 1a of the twomost layers and the bottom layer End of veneer 61f
In the lamination process B, in which the veneers 1 are laminated with the edge of the veneer 1 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 the dimension of L/N (L/N) from the edge. : The fiber length of the veneer, N, and the number of laminated layers. As shown by the two-dot chain line in the figure, when facing one method S or S' (preferably about 15 times or less of the thickness of the middle plate used in the plywood of the present invention), , along with exposure. In order to avoid applying adhesive to these exposed surfaces, 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 sprayer, curtain coater, or film adhesive supply device (when using a film adhesive). As shown in FIG. 9, it is extremely convenient in practice to place the ends 1a and 1b of the veneer 1 in an overlapping state and apply the adhesive using various types of ordinary adhesive applicators.

In this case, the overlapping length of the veneers is set based on the exposed surface dimension in the lamination process B marked with 1ril, and the view shown in the figure is the overlapping length when the above L/N is exposed. , the view is approximately L/N, arbitrary facing dimension S, arrangement L
When the distance S' is set, the overlapping length is also increased or decreased accordingly, as shown by the two-dot chain line.

Of course, it is basic that the dimensions of the non-adhesive area and the self-recorded exposed surface completely match, but in practice, lr+1 should be slightly smaller or larger to reduce errors in each process or between both processes. deal with.

In any case, the lamination work in the lamination process is the same, but the work of overlapping this 1i school board is shown in Figures 12 and 13.
If it is carried out automatically, semi-automatically, or manually using a conveyor belt with a positioning member, such as the conveyor belt 5 with the stopper 4 illustrated in Section 2, each process can be carried out stably with extremely high dimensional accuracy. can.

Furthermore, as illustrated in FIG. 11, the drive source 7 drives the conveying body as described above, which is prepared for the adhesive application process A, and the same drive system as previously described [17 is used for the lamination process B via the deceleration mechanism 8]. If the configuration for driving the transport body as described above is adopted, each process will be very stably related to each other by the precise setting of the speed reduction mechanism 8, and the error between both processes will be reduced to a fixed value.

In this case, there is no problem even if the drive source 7 is turned ON and OFF intermittently once, so at 1 in Figure 8, it is possible to use an intermittent cold press in the temporary bonding process. becomes easier.

In addition, if it is permissible to expose the adhesive applied to the middle plate during the process of laminating the middle plate, or if it is assumed that it will be actively exposed, then the adhesive autopsy 41L: In particular, the application of adhesive is carried out without properly securing the area where the adhesive is not applied.

For example, in the example shown in FIG. 8, an adhesive application process is configured in which the intermediate plates 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 middle plate lamination process B, the adhesive will be exposed almost continuously on the middle plate exposed on one side, but this is not acceptable for the plywood to be manufactured. Alternatively, it is also possible to use the exposed adhesive to bond other intermediate boards, decorative paper, boards, etc. in a laminated manner. Therefore, the adhesive application process A is carried out, and the desired W appearance of the adhesive is actively carried out in the lamination process B, and other laminated materials are further laminated in the lamination process. 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 many examples other than the above-mentioned examples. It can be configured in various forms.

In addition, the adhesive application process and the lamination process are not connected as shown in FIG. 8, but are located on the same plane E, and the adhesive application process and the lamination process are arranged at the upper part in the conveyance direction and the lamination process at the lower part. They may be connected to each other in some cases, and if necessary, both processes are connected in a desired form.

Moreover, 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 lamination process B, the plywood according to the present invention can be manufactured continuously. Once the desired length is reached, cutting is carried out using a cutting process.

[Brief explanation of the drawing]

Figures 1 and 2 are front views showing plywood according to the present invention, Figures 3 to 7 are explanatory diagrams showing the laminated state of veneers, and Figure 8 is an explanation showing a method for manufacturing plywood. Figure 9 is an explanatory diagram showing the adhesive application state, Figure 1θ is an explanatory diagram showing a partially enlarged lamination state of the intermediate plate, and Figure 11 is an adhesive application process and lamination process using the same drive source. FIGS. 12 and 13 are perspective views showing conveyor belts for overlapping the intermediate plates, respectively. In the figure, 1 is a veneer, and 1a and 1b are veneers. The end part 2 is plywood.

Claims (1)

[Claims] 1. All or any number of veneer veneers constituting the plywood are laminated and bonded with predetermined deviations in the fiber direction of the veneer veneers, and in addition, in the same direction, the veneer veneers are laminated and bonded in stages according to the deviation direction. The plywood is bent in the thickness direction so as to extend parallel to both surfaces of the plywood, and is cut to an arbitrary size including the bent portion. .