JPS58167101A - Flitch - 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 plywood in which laminated veneer veneers (hereinafter referred to as veneer veneers) are shifted by a predetermined dimension and bonded in layers, and fibers are attached to the front and back surfaces of the plywood. This relates to plywood in which the middle part of the plywood has a veneer with a fiber direction perpendicular to the fiber direction.

In Japanese Patent Application No. 56-197563, the applicant has
Or plywood made by laminating and gluing multiple veneers shifted by a predetermined dimension in the direction of the fibers of the hand, and March 4, 1981.
All or all in the date patent application? ! We have proposed plywood made by laminating and bonding several veneers shifted by a predetermined dimension in the direction perpendicular to their fibers.

However, even with the above-mentioned river plywood, most of the veneers have their WAN directions aligned in the same direction, so it is possible to obtain sufficient strength in the direction perpendicular to the fibers. There was a tendency for warping to occur as a result of changes over time.

The purpose of the present invention is to improve the plywood that the present applicant proposed and applied for, and to provide a plywood that improves the strength in a well-balanced manner in the direction perpendicular to the fibers and prevents warping. .

Hereinafter, the present invention will be explained according to examples.

Fig. 1 is a perspective view showing examples of veneers constituting each layer of plywood according to the present invention, Fig. 2 is a perspective view showing plywood 3, and 1 in the figure uses at least three veneers 2a to 2C. 2 a % veneer located at both ends with the fiber directions perpendicular to each other
The width in the fiber direction of 2 c is longer than the predetermined dimension Q1 described later, preferably 5 times or more the thickness of the veneer, and more preferably 15 to 15
This is a bonded veneer made by making it about 0f6 long and bonding the fibers in the same direction.

A scarf cut having an appropriate scarf cut length is formed on the end 11111.1b of the bonded veneer 1 as required.

The plywood 3 is made by arbitrarily laminating the above-mentioned bonded veneers 1, and laminates the bonded veneers 1 at both ends so that the end 1m exposed on one surface and the end 1b exposed on the other surface are positioned substantially opposite each other. A predetermined difference in the fiber direction of plates 2a and 2C.

The 5-ply plywood is shown in Figure 0, which is bent and laminated in the thickness direction of the plywood 3 at intervals of the predetermined dimension ct1, extending parallel to each surface and being laminated and bonded. .

The above-mentioned predetermined dimension ul is approximately Q 1 =L/, where L is the width of the bonded veneer 1 in the horizontal direction in the drawing, and N is the number of laminated layers.
Set to N.

The plywood 3 shown in FIG. 3 is made by laminating and bonding each of the bonded veneers 1 in the same manner as described above without scarf-cutting the ends of the bonded veneers 1. Although there is a section on both sides compared to the original, the surface quality is generally good, and aesthetics can be added to it, and there is no practical problem, and the recess can be easily removed if necessary. It is also possible to apply a stopper or a groove of an arbitrary shape to the surface.

Compared to the plywood 3 shown in FIGS. 2 and 3, the plywood 3 illustrated in FIG. 4 is laminated and bonded in such a manner that the ends 1a and 1b of each bonded veneer 1 exposed on each surface overlap, This is a 5-ply plywood structure with small convex portions on both sides.

If necessary, the above-mentioned small protrusions can be left as they are to create an aesthetic appearance, or they can be processed into a protrusion of a desired shape, or even sanded as shown by the two-dot chain line in the figure. It can be easily removed by processing such as cutting, and it is possible to obtain excellent flatness like the plywood shown in FIG. 2.

In addition, when the small convex portions are removed, the ends of the veneers 2a and 2C that make up the bonded veneer 1 are exposed on each side, but even if there is a plywood 3 shown in FIG. This can be obtained by inverting and laminating and bonding the scarf cuts formed at the ends 1a-1b facing outward.

Furthermore, FIGS. 5 to 8 show various examples of the laminated state before being laminated and bonded to the plywood 3.
1b, and examples of the construction of the end portions 1a and 1bTh, and in either case, the plywood 3 according to the present invention can be constructed.

FIG. 9 shows an example of the basic manufacturing method of plywood 3 according to the present invention. The ends 1b of the veneers 1 are overlapped as shown in the figure, and adhesive is applied by the spreader 4.

The application of the adhesive is carried out by leaving an unapplied area on one side of the bonded veneer 1, and in the next lamination process B, the adhesive veneer 1 is sequentially applied with the unapplied area exposed. Stack them while shifting them as shown in the figure.

The laminated bonded veneers are transported to temporary bonding process C, which has an intermittent or continuous cold press (not shown) or a device that temporarily fixes the relative positions of the bonded veneers by appropriate means, and is temporarily bonded. Then, it is cut to the specified size using the blow-off cutting process.

and an adhesive curing device such as a hot press (not shown).
In the bonding step E, the bonded veneers are bent stepwise in the thickness direction of the plywood and bonded together including the bent portions extending parallel to the front and back surfaces of the plywood, and A plywood having the lamination mode as described above is manufactured.

Regarding adhesive application step A, 1
As in the process example described in riI, in the process B of laminating bonded veneers, the adhesive applied to the bonded veneers is not exposed at all or even at all, and the bonded veneers are sequentially shifted and stacked. If this is the premise, 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 bonded veneer 1 in the lamination process B, and as shown, the edge I4n of the top layer bonded veneer 1a and the edge of the bottom layer bonded veneer 1 are shown in an enlarged view. In the lamination process B, in which the edges of each bonded veneer 1b are stacked in a facing relationship as shown in the figure (in this case, the facing dimension is referred to as 0), each bonded veneer 1
are the dimensions of L/N sequentially from the edge (L: length of the bonded veneer,
N: Number of laminated layers, which is 4 in the illustrated case. ) will be exposed, and depending on the existence and degree of edge processing of the bonded veneer 1 used, as well as other reasons, the facing dimension S or S' (the plywood of the present invention (Preferably, the thickness should be about 15 times or less than the thickness of the bonded veneer to be used.) When facing each other, the exposed dimensions will increase or decrease accordingly, and it will be difficult to apply adhesive to these exposed surfaces. In order to avoid this, it is necessary to ensure that there are 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, film adhesive supply device (when using a film adhesive), or As shown in FIG. 11, it is extremely convenient in practice to place the ends 1a and 1b of the bonded 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 bonded veneers is set based on the exposed surface dimension in the lamination process B described above, and when the facing dimension S and So are set, heavy restraint is applied accordingly as shown by the two-dot chain line. Set the length by increasing or decreasing it.

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 bonded veneer is carried out using a conveyor belt 6 with a positioning member, such as the conveyor belt 6 having the stopper 5 illustrated in FIGS. 121 and 13. If the process is performed automatically, semi-automatically, or manually on the conveyor, each process can be stably performed with extremely high dimensional accuracy.

Furthermore, as illustrated in FIG. 14, a drive source 7 drives the conveyor as described in preparation for the adhesive coating process A, and the same drive source 7 drives the conveyor as described above through a deceleration mechanism 8 to achieve an extremely stable relationship in a lamination setting. 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 driven intermittently by turning ON and OFFFL/, 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 bonded veneers is allowed to be exposed in the bonded veneer lamination step B, or if it is assumed that the adhesive is actively exposed, the adhesive application step is not particularly detailed. Adhesive is applied without properly securing the non-adhesive area.

For example, in the example shown in FIG. 9, an adhesive application process is configured in which the bonded veneers 1 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 process B of laminating the bonded veneers, the adhesive will be exposed almost continuously on the bonded veneers exposed on one side, but this is not acceptable for the plywood to be manufactured. Alternatively, the adhesive may be applied to other veneers, such as the so-called original board, in order to wipe away the unevenness on the surface of plywood.
It is also possible to laminate and bond decorative paper, boards, etc.

Therefore, the adhesive application step A is carried out to actively expose such adhesive as desired in the lamination step B, and in the lamination step, another laminated material is further laminated and the next step is performed. It is also possible to reach the process of

As described above, the specific 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 methods other than the above-mentioned inversion. It is composed of the following form.

In addition, the adhesive application process and the lamination process are arranged on the same plane, in addition to being connected as shown in FIG. Each step may be connected to each other, and both steps may be connected in a desired form as necessary.

Furthermore, in the example shown in FIG. 9, if instead of the temporary bonding process C, the bonding process E having continuous hot pressing is connected to the laminating process B, the production of plywood according to the present invention can be carried out continuously, as desired. When the length is increased, cutting is performed in the cutting process.

As explained above, in the present invention, the veneers of each layer constituting the plywood are formed by arranging at least three veneers in series with the fiber directions of the veneers located at both ends facing the same direction,
The veneers of each layer are shifted by a predetermined dimension in the direction of the fibers of the veneers located at both ends thereof, and are bent in the direction of the thickness of the plywood by the predetermined dimensions in the same direction so as to extend substantially parallel to both surfaces of the plywood. This plywood is characterized by being laminated and bonded in a similar manner, and cut to any size while including the bent portion, and the fibers of the veneer located on the inside of the plywood are different from those on the front and back sides. This plywood is arranged perpendicularly to improve strength in both directions in a well-balanced manner and to prevent warping.

In addition, general information regarding plywood such as the species of wood of the veneer or plywood used, thickness, size, positioning of back cracks that exist in the laminated veneers, number of plies, adhesive used, and moisture content of the veneer. Changes to matters shall be made in accordance with common practice, but there are no particular restrictions.

In addition, in the examples, the construction process, etc. of the veneers of each layer constituting the plywood was described using the bonded veneer 1 as an example, but the construction process is not limited to veneers that have been bonded in advance. It is also possible to use the process of manufacturing the described plywood by cutting each of the veneers constituting the board. Of course, a so-called tunnel may be formed in the base on which the individual veneers are arranged.

[Brief explanation of the drawing]

1 is a perspective view showing a bonded veneer constituting the plywood according to the present invention; FIG. 2 is a perspective view showing the plywood; FIG. 3 is a perspective view showing the plywood according to a modified embodiment of the present invention; 8 to 8 are explanatory diagrams showing a laminated state of bonded veneers, FIG. 9 is an explanatory diagram showing a method of manufacturing plywood, and FIG. 10 is an explanatory diagram showing a partially enlarged laminated state of bonded veneers, Fig. 11 is an explanatory diagram showing the state of adhesive application, Figs. 12 and 13 are perspective views showing the conveyor belts for overlapping the bonded veneers, and Fig. 14 is an illustration showing the adhesive applied by the same drive source. FIG. 2 is an explanatory diagram showing the state in which the agent application process and the lamination process are driven, and in the figure, 1 is a bonded veneer, 1a-1b are the ends of the bonded veneer, 2a to 2c are veneers, and 3 is a plywood. Patent applicant: Meinan Seisakusho Co., Ltd. Agent: Patent attorney: Ken Fujiji −

Claims (1)

[Claims] 1. Each layer of plywood veneer (at least 3 layers)
A plurality of veneer veneers are arranged in series with the fiber direction of the veneer veneers located at both ends facing the same direction, and the veneer veneers located at both ends of the veneer veneer 1 of each layer are Shift it by a predetermined dimension in the direction of the fibers of the board, bend it in the thickness direction of the plywood every predetermined dimension in the same direction, and glue it in n layers so that it extends approximately parallel to both sides of the plywood. . Plywood, characterized in that it is cut into any size including the bent portion.