JPS6335302A - Method of treating flitch - Google Patents

Abstract

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

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a method for manufacturing flexible plywood.

[Prior Art] A conventional method for manufacturing plywood involves applying an adhesive to a veneer veneer (hereinafter referred to as veneer) cut from raw wood, and then gluing a plurality of veneers together.

[Problems to be solved by the invention] However, the plywood manufactured in this way has no flexibility;
This had the disadvantage that if it was bent to be used on corners or curved surfaces such as furniture that was not on a flat surface, interior parts of buildings, etc., it would break and could not be used.

It is also possible to bend a piece of plywood at an arbitrary curvature by passing it between rolls such as a leveler to create cracks and impart flexibility, but it is difficult to set the curvature for the material of the plywood. If the curvature is small, it will not be possible to crack and the plywood will not have flexibility.On the other hand, if the curvature is large, stress will be concentrated in one place, causing the plywood to break and cause large cracks. As a result, these M-curves are formed intermittently at large intervals throughout the plywood, resulting in poor aesthetics and the plywood being unusable for the above-mentioned purpose.

[Means for Solving the Problems] In order to solve such problems, the present invention forms cracks in the plywood direction in a plywood made of a plurality of veneer veneers, and furthermore, performs the above treatment. After that, a sheet-like material such as a veneer is adhered to the surface of the plywood.

[Function] As a result, the resulting plywood can be easily bent with a small force in the direction perpendicular to the fiber direction of the front and back veneer veneers of the plywood due to the cracks.

[Example] Examples of the present invention will be shown below.

The device described in Japanese Patent Application No. 1981-89492, filed by an unfiled applicant, is, for example, as shown in FIG. On the circumferential surface of each of the rolls 1 and 2 to be rotated, a cutting edge line continues in a spiral manner in the same direction (for example, at an angle of about 6 degrees with respect to the axial direction of the rolls 1 and 2) and is perpendicular to the cutting edge line. Projections 3.4 having an isosceles triangular cross-sectional shape with an apex angle of 60 degrees and a height of 4 mm are formed at regular intervals (eg, 4 mm intervals) in the rotation direction of the rolls 1 and 2.

Also, the distance between the tips of these opposing protrusions 3.4 is smaller than the thickness of the plywood P to be processed (for example, a distance of 20% of the thickness).
Arrange rolls 1 and 2 so that

Note that these protrusions 3.4 are constructed using a rigid body such as iron, steel, stainless steel, or ceramic.

A plywood P is placed between the rolls 1 and 2 prepared as described in 1 above, and a veneer P1. It is inserted in the direction perpendicular to the fiber direction of P3.

Then, as the roll 1.2 rotates, the plywood P is pressed with the protrusions 3.4 intersecting each other on the front and back surfaces, and pressing force is applied to the plywood P at the locations where the protrusions 3.4 intersect and in the surrounding areas. That's what happens.

As a result, cracks 5 are formed in the plywood P at fine pitches, that is, at intervals in the rotational direction of the projections 3.4, due to the pressing force.
As the plywood P passes between the rolls 1 and 2, countless cracks 5 are formed throughout the plywood P. (Refer to Figure 4) Also, although the direction of movement of the plywood and the fiber direction of the middle plate P2 of the plywood P are the same, the protrusions 3.4 act in the direction across these fibers, so the middle plate P2 in the fiber direction are folded at the fine pitch mentioned above.

The plywood P thus obtained can be easily bent in the direction perpendicular to the fiber direction of the front and back veneers (in the direction of the arrow in FIG. 4), and is highly flexible.

Moreover, as mentioned above, since the protrusions 3.4 act in almost the same direction as the m#I direction, the strength of the front and back veneers in the fiber direction is hardly impaired. A decorative veneer, such as a veneer for the original board, a veneer board, etc., may be glued on the front surface of the P and, if necessary, the back surface, using an adhesive, to form plywood.In addition, the veneer for the original board, the veneer board, etc., may be bonded with an adhesive. When using a urethane rubber adhesive as the adhesive, the adhesive after curing is more flexible than the commonly used urea resin adhesives, etc., and as a result, the flexibility of the plywood is more effectively exhibited. It will be done.

Next, a second embodiment of the present invention will be described.

In the second embodiment, the following device is used to form cracks in the plywood R.

That is, as shown in FIG. 2, in the rolls 6 and 7 which are arranged opposite to each other and are driven to rotate in the direction of the arrow by a motor (not shown), an arbitrary constant value is formed on the circumferential surface of the roll 60 in the axial direction of the roll 6. A large number of piercing bodies 8 are provided in a scattered manner, each having a length of, for example, 30 m5 and having a cutting edge at the tip.

In addition, the distance between the circumferential surface of the roll 6 and the circumferential surface of the roll 7 is approximately the same as the thickness of the 3-ply plywood R to be treated, and the piercing body 8
The height from the circumferential surface of the roll 6 is set as the height at which the intermediate plate R2 can be pierced from the -h surface of the 3-ply plywood R to be processed.

The 3-ply plywood R is inserted between the rolls 6.7 thus prepared in a direction perpendicular to the fiber direction of the veneers R1 and R3 bonded on the front and back sides.

Therefore, the plywood R is pierced with a piercing body 8 from the upper surface, and cuts 9 are formed in the original plate R1 and the intermediate plate R2 on the upper surface side. (See Figure 5) When the plywood R thus obtained is bent in a direction perpendicular to the fiber direction of the front and back veneers (in the direction of the arrow in Figure 5), with the original plate R1 or R3 side on the outside. In plywood that is not treated in this way, the notch is formed in the middle plate R2, which exerts a force to resist bending, as described above.
It can be easily bent. Moreover, since one side of the plywood R, that is, the surface of the original board R3, is not damaged by the piercing body 8, it can also be used in places where aesthetic appearance is required by keeping the original board R3 side as the front side. It can be done.

Of course, as in the first embodiment, the original veneer or veneer may be adhered to the surface of the plywood R using an adhesive.

Next, a third embodiment of the present invention will be described.

As shown in FIG. 3, a large number of circular saws 10 with a thickness of 1 are mounted at narrow intervals in the axial direction, and a roll 11 is driven to rotate at high speed by a motor (not shown). Then, in order to increase the frictional force with the plywood, a roll 12 is disposed around which is coated with an elastic material such as rubber and driven to rotate at the speed of conveying the plywood.

Moreover, the distance between the circumferential surface of the roll 12 and the tip of the circular saw 10 is
It is provided so that it is slightly larger than the thickness of the veneer S3 on the lower surface side of the 3-ply plywood S to be treated.

In the apparatus equipped as described above, the plywood S is bonded to the front and back of the veneer S1. It is inserted between rolls 11 and 12 in the same direction as the fiber direction of S3.

Therefore, the plywood S is conveyed at the circumferential speed of the roll 12 and rotated at high speed by a circular saw 10.
A large number of notches 13 are formed in 2. (:56
(See figure) The plywood S obtained in this way is made of front and back veneers S1 and S3.
The original plate S1 can be easily bent in a direction perpendicular to the fiber direction (in the direction of the arrow in FIG. 6) with the original plate Sl side facing outward.

In this embodiment, instead of the circular saw 10, a slitter having a continuous cutting edge around the periphery may be used to drive the slitter, or a fixed knife with the cutting edge facing the loading side may be used. Good too.

Above, three embodiments have been shown, but especially the first embodiment. In the second embodiment, since the protrusions or protrusions are provided on the surface of the roll, the distance in the rotational direction of the roll can be reduced, and as a result, the distance between cracks formed in the plywood can also be reduced. Therefore, the treated plywood can be bent with a larger curvature.

Furthermore, in the example, the case of 3-ply plywood was explained, but in the case of 5-ply or more plywood, flexibility can be similarly obtained by forming a crack in at least the central veneer. Cracks may be formed deeper if necessary.

Furthermore, in the present invention, flexibility may be obtained by forming cracks in the front and back veneers of the plywood in a direction perpendicular to the m* direction of the front and back A width boards.

On the other hand, the object to be processed is #i&m
In addition to plywood bonded with the directions perpendicular to each other, it may also be an ascending plywood bonded with a plurality of intermediate boards bonded with the same fiber direction.

[Effects] As described above, according to the present invention, plywood can be made bendable and can be used for corners and curved surfaces such as furniture that is not on a flat surface, architectural interior parts, etc. It is.

[Brief explanation of the drawing]

The drawings show embodiments of the present invention; FIG. 1 is a partial perspective view of the first embodiment, FIG. 2 is a partial perspective view of the second embodiment, and FIG. 3 is a partial perspective view of the third embodiment. 4, 5, and 6 are partial perspective views of the plywood after treatment. 1.2.6.7.11.12...Roll, 3.4...
・Protrusion, 8... Piercing body, 10... Circular saw, 5...
Cracking, 9...Φ cut, P, R, Sφ, 3-ply plywood. Patent applicant: Nayama Seisakusho Co., Ltd. sll! 1 s2 diagram

Claims (1)

[Scope of Claims] 1. In a plywood made of a plurality of veneer veneers, an inner layer veneer veneer whose fiber direction is perpendicular to the front and back veneer veneers of the plywood is perpendicular to the fibers of the inner layer veneer veneer. A method of processing plywood, characterized by the formation of directional cracks. 2. In a plywood made of a plurality of veneer veneers, a crack is formed in the inner layer veneer veneer whose fiber direction is orthogonal to the front and back veneer veneers of the plywood in a direction perpendicular to the fibers of the inner layer veneer veneer. A method for manufacturing plywood, which comprises: then adhering a sheet-like material such as a veneer veneer to the surface of the plywood.