JPS5923528B2 - Manufacturing method of irregularly shaped laminated timber - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing irregularly shaped laminated timber in which a plurality of veneers are bent and laminated and bonded together.

Conventionally, T-shaped members used for the legs of furniture such as desks have been manufactured from irregularly shaped laminated wood in the following manner.

That is, as shown in FIG. 1, female and male molds 1 and 2 each having L-shaped mold surfaces 1a and 2a were prepared, and as shown in FIG. 2, an adhesive was applied to the upper surface of each mold. A plurality of veneers 3 are stacked and placed on a female mold 1.

In this case, a release paper 4 is placed on the upper surface of the uppermost veneer 3.

Next, these laminated veneers 3 are heated and heated with female and male molds 1 and 2.
By pressing, it is bent into an L shape and laminated and bonded to form the L-shaped member 5 shown in FIG. 3, and as shown in FIG. 4, two L-shaped members 5 are combined and bonded. A T-shaped member 6 is formed.

However, this method requires a large number of manufacturing steps because the T-shaped member 6 is formed by combining and joining two L-shaped members 5, and also, since the L-shaped member 5 warps every month, the T-shaped member 60
The problem was that the dimensional accuracy was unstable.

Therefore, an object of the present invention is to reduce the number of manufacturing steps,
An object of the present invention is to provide a method for manufacturing irregularly shaped laminated timber that can manufacture a T-shaped member with stable dimensional accuracy.An embodiment of the present invention will be described with reference to FIGS. 5 to 10.

That is, as shown in FIG. 5, the manufacturing method of this irregularly shaped laminated timber starts with a pair of side molds 7 and 8 having L-shaped mold surfaces 7a and 8a, and a substantially planar mold surface 9a. A lower mold 9 having the following is prepared.

In this case, the strip-shaped narrow veneer 11 has a width dimension equal to that of the veneer 1.
It is set smaller than the width dimension W of 0.

Further, the lower mold 9 is provided with a protrusion 9b having both hypotenuses curved in a concave manner at the center of the mold surface 9a.

Next, as shown in FIG. 6, the veneers 10 each coated with adhesive on the lower surface are laminated, and a strip-shaped narrow veneer 11 coated with adhesive on both sides is longitudinally placed in the center of the upper surface of the top veneer 10. Stack them in the same direction.

In this case, the adhesive is a thermosetting adhesive such as a phenolic adhesive, a urea-melamine adhesive, an unsaturated polyester adhesive, an epoxy adhesive, or a vinyl acetate adhesive.

Use a thermoplastic adhesive such as nitrile rubber.

After that, these laminates 12 are reversed, and as shown in FIG. is arranged on the lower mold 9 in a chevron-shaped state.

Next, a release paper 14 is placed on the top surface of the topmost veneer 10,
By heating and pressing the laminate 120 from the upper surface of both oblique sides of the chevron shape with a pair of side molds 7 and 8, the laminate 1
2 are bent, formed and laminated and bonded to form a T-shaped laminated timber 15 shown in FIG.

Finally, the folded portion of the vertical edge of the T-shaped laminated timber 15 is cut and removed at the cutting position A shown in FIG. 8 to form the T-shaped member 16 shown in FIG. 9.

FIG. 10 is an enlarged side view of the main part of FIG. 9, and as shown in the figure, both end surfaces 11a of the narrow strip veneer 11 are flush with each other at a position inward from the outer surface 16a of the horizontal piece of the T-shaped member 16. It will be finished.

In this way, since the T-shaped member 16 can be formed by one press, the number of manufacturing steps is reduced and dimensional accuracy is stabilized.

In this case, since the above method includes the step of cutting and removing the folded portion of the vertical edge of the T-shaped laminated timber 15, this brings about a disadvantage of lowering the material yield, but this disadvantage is outweighed by the manufacturing process. It has sufficient practical value because the profits associated with the decrease in numbers can be greater.

The basis for this will be explained below while comparing it with a conventional example.

First, by using the above method, it is possible to form the T-shaped member 16 in about half the time required compared to the conventional method.

In other words, when applying adhesive to a veneer using a roll coater and laminating it, the method of the present invention requires about 10 pieces.
In the conventional method, since it is necessary to manufacture two L-shaped members 5 (FIG. 3), it takes about 20 minutes, which is twice as long.

For the same reason, the method of the present invention takes about 10 minutes to transport the laminated veneer into the mold, but the conventional method takes about 20 minutes, which is twice as long. Heating by
The present method takes about 5 minutes to pressurize and mold, but the conventional method takes about 10 minutes, which is twice as long.

In addition, in the present method, it takes about 5 minutes to cut and remove the folded part of the T-shaped laminated timber 15, but in the conventional method, it also takes about 5 minutes to join the pair of L-shaped members 5. It takes.

Therefore, the total time required for each method is as short as about 30 minutes for the method of the present application, whereas the conventional method is about 5 minutes.
The T-shaped member 16 can be formed in as long as 5 minutes, which is about half the time required by the conventional method using the method of the present invention.

By the way, the effect of material yield is determined by the ratio of material to manufacturing cost.

Generally, it is considered to be 50 parts, so the material loss corresponding to the 25 parts reduction in the above man-hours is 25 parts, that is, even a loss of 30 parts for more than 100 materials can be enough to cope with the cost.

Therefore, if the material ratio is 50 parts, it will be profitable if the material loss is 50 parts or less, and if the material ratio is 70 parts, it will be profitable if the material loss is 20 parts or less. I can do it.

In this way, although the method of the present application has the disadvantage of a decrease in material yield, this disadvantage can be outweighed by the benefit associated with the reduction in the number of manufacturing steps, so it has sufficient practical value.

In addition, the width dimension of the bending method of the narrow strip veneer 11 is
The narrow width veneer 11 is set to be smaller than the width of the folding method of 0, and the narrow width veneer 11 is folded and bonded to the center of the vertical piece of the T-shaped member 16, and as shown in FIG. Both side end surfaces 11a of the plate 110 are connected to the horizontal piece outer surface 1 of the T-shaped member 16.
6a, the residual stress generated at the corner B of the T-shaped member 16 hardly acts in the direction of peeling off both ends of the narrow strip veneer 110, and therefore the T-shaped It is also possible to increase the peel strength of the strip-shaped narrow veneer 11 against residual stress at the corner portion B of the member.

Note that these T-shaped members 16 can be used not only as legs of furniture, but also as wild edges, decorative edges, joint members, etc.

As described above, the method for manufacturing irregularly shaped laminated timber of the present invention is
A pair of side molds having a letter-shaped mold surface and a lower mold having a planar mold surface are prepared, and adhesive is applied to at least one surface of the laminated veneers. Double-sided adhesive veneers coated with adhesive are laminated with their longitudinal directions aligned,
The centers of these laminates are lifted along the longitudinal direction to form a chevron shape and placed on the lower mold, and the upper surfaces of both shoulders of the chevron are heated and heated by the pair of side molds, respectively.
By pressing, the laminate is bent, laminated and bonded to form a T-shaped laminated timber, and the folded part of the vertical edge of this T-shaped laminated timber is cut and removed, which reduces the number of manufacturing steps. This has the effect that it is possible to manufacture a T-shaped member with reduced dimensional accuracy and stable dimensional accuracy.

[Brief explanation of the drawing]

1 to 3 are explanatory diagrams of a conventional example, FIG. 4 is a perspective view of a T-shaped member manufactured by the method, and FIGS. 5 to 8 are explanatory diagrams of an embodiment of the present invention, respectively. FIG. 9 is a perspective view of a T-shaped member manufactured by the method;
Figure 0 is an enlarged side view of the main part. 7.8... Side mold? a, 8a...
...L-shaped mold surface, 9...Lower mold, 9a...
...Flat mold surface, 10... Single plate, 11.
...Striped narrow veneer (double-sided adhesive veneer), 11a...
...Side end surface, 12...Laminated plate, 15...
...T-shaped laminated wood.

Claims (1)

[Claims] 1. A pair of side molds having L-shaped mold surfaces and a lower mold having a flat mold surface are prepared, and a plurality of laminated sheets are prepared by applying an adhesive to at least one surface. At the center of the lower surface of the veneer, double-sided adhesive veneers coated with adhesive on both sides are laminated with their longitudinal directions aligned, and the center of these laminates is warped in the longitudinal direction and lifted to form a chevron shape and placed on the lower mold. placed in
By heating and compressing the upper surfaces of both mountain-shaped slopes with the pair of side molds, the laminate is bent, laminated and bonded to form a T-shaped laminated timber. A method for manufacturing irregularly shaped laminated timber, characterized by cutting and removing a folded portion of one vertical edge. 2. The width of the double-sided adhesive veneer in the bending direction is set smaller than the width of the veneer in the bending direction, and the double-sided adhesive veneer is folded over the center of the vertical piece of the T-shaped laminated timber. 2. The method for manufacturing irregularly shaped laminated timber according to claim 1, wherein both end surfaces of the double-sided adhesive veneer are flush with each other at a position inward from the outer surface of the horizontal piece of the T-shaped laminated timber.