JPS6236844B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] This invention belongs to the field of manufacturing technology for laminated veneers.

[Background technology]

Laminated veneers are manufactured by laminating raw veneers with an adhesive, sandwiching them between molds with uneven curved surfaces, pressing them together to obtain frits, and then slicing them. Ta. At this time, various measures have been taken to reproduce the grain of natural trees as faithfully as possible. For example, they devised ways to color the raw material veneer, and performed preliminary processing on the raw material veneer to improve fidelity.

However, the material veneers manufactured using rotary lace etc. still have heather grains and defects on the raw wood, and even after being finished into laminated veneers, these appear and become laminated. This tends to deteriorate the yield of veneer and prevents the expression of wood grains close to those of natural products.

On the other hand, various methods have been studied to reproduce the concentrated conduits observed in corrugated ring-pore materials such as oak as faithfully as possible to natural materials, but no success has been found yet. In other words, the natural wood conduit is
If you slice the raw wood into grains and adjust the veneer,
Pores appear on the surface of the so-called pore zone in the direction intersecting the surface of the veneer. This is observed in an uneven pattern, giving a three-dimensional feel. Also, when wiping is performed, paint enters the central conduit, creating a so-called wiping effect. However, in the conventional manufacturing method of laminated veneer, the concentrated conduit was expressed by the coloring method as described above, so the pattern of the concentrated conduit was only expressed by printing, and therefore the three-dimensional effect was not achieved. There were no pores, no pores, and no wiping effect could be obtained.

The present inventors have been researching methods for expressing concentrated conduits of wavy annular pore materials for some time, and as a result,
Two types of raw material veneers were prepared: a veneer for the pore area with artificially formed pores, and a veneer for the non-porous area, and
We devised a manufacturing method that allows us to create a three-dimensional representation of a concentrated conduit by layering these layers alternately, pressing them together, forming them into fritches, and slicing them.

However, this method has the disadvantage that it is necessary to prepare two types of raw material veneers, which are made by performing complicated processing on raw material veneers, which complicates the process and lowers the yield. In addition, the adhesive enters the pore area and closes the pores that have been painstakingly formed, so when painting the laminated veneer later, the wiping agent does not enter the pore area and the so-called wiping effect cannot be obtained. The drawbacks still remain.

[Purpose of the invention]

This invention was made to eliminate the above-mentioned conventional drawbacks, and aims to express concentrated conduits in a laminated veneer with high yield and faithfully to natural conduits.

[Disclosure of the invention]

In this invention, raw material veneers are laminated with an adhesive interposed, sandwiched between flat templates and pressed to obtain a primary frit, and then this is perpendicular to the surface of the raw material veneer. The raw material veneer is sliced in the same direction and along the fiber direction to obtain a primary sliced veneer in which the wall thickness of the raw material veneer appears straight-grained, and then concave grooves are provided to this primary sliced veneer. By filling this with wood flour, a processed veneer with a coarser density area is obtained, which is then laminated with an adhesive interposed, and then pressed between molds with uneven curved surfaces. The present invention provides a method for producing a laminated veneer, which is characterized in that the laminated veneer is obtained by successively performing , fritting, and slicing.

Hereinafter, description will be made based on drawings shown as examples.

FIG. 1 is a perspective view of a primary flitch 1 obtained in an intermediate step of the present invention. This material is made from a material veneer obtained from relatively low-grade logs using rotary lace, etc., which is bleached and dyed as necessary to create a raw material veneer, which is then bonded with an adhesive. It is obtained by pressing and forming a frit using a flat template.

FIG. 2 shows the primary fritch 1 in a direction perpendicular to the surface of the raw material veneer used to make it.
FIG. 2 is a perspective view of a primary sliced veneer 2 obtained by slicing in a direction along the fiber direction.
This means slicing so that the straight grain appears, so to speak, but the straight grain is not necessary as a wood grain, and in reality, the straight grain is hard to notice. The veneer 2 obtained in this way is a collection of veneer material further carved in a direction perpendicular to the surface of the board and along the direction of the fibers into a square thread shape, so the heat quality of the raw wood is It is becoming more and more difficult to appear. Therefore, when the grain of the final laminated veneer is expressed, the grain of the material veneer will not appear in the non-porous area, and the adhesive layer will not appear widely in the non-porous area. Therefore, the adhesive has the advantage of being more noticeable (note that if the grain is in the direction of the board, there is a high probability that the adhesive layer will appear on the board surface). Furthermore, it is convenient because it is less likely to be damaged during subsequent groove processing. These advantages can be said to be greater than the case where a single plate of material is directly grooved and used for secondary flitting.

FIG. 3 is a perspective view showing a grooved veneer 3 obtained by providing grooves 4 to the primary sliced veneer 2. As shown in FIG. The size and shape of this groove 4 are determined by taking into account the scale and distribution of natural concentrated conduits. The method for creating the grooves 4 is not particularly limited, but includes, for example, a method of pressing with a roll, a method of cutting with a knife, and the like.

FIG. 4 is a perspective view showing a processed veneer 5 obtained by filling the grooves 4 of the grooved veneer 3 with wood flour 6. When the wood flour 6 is filled, a part where the density is rougher than other parts is formed, for example, in a linear shape. In other words, since there are gaps between the particles of the wood flour 6, the porosity increases. There are no particular limitations on the wood flour used here. The wood flour itself may be simply sprinkled and filled into the grooves 4, but it may also be filled together with a binder. However, in this case, care must be taken not to lower the porosity. For this purpose, if a binder is to be used, it is preferable to use a foamable binder such as urethane resin.

The processed veneer 5 obtained above is clamped between mold plates having an uneven curved surface by a conventionally known method to obtain a secondary frit, which is then sliced to obtain the desired laminated veneer. Figure 5 shows 2 obtained from the processed veneer 5.
FIG. 7 is a perspective view of the next flitch 7; FIG. 6 is a perspective view of the target veneer assembly 8. In the laminated veneer obtained as described above, the non-porous area 9 and the perforated area 10 are clearly expressed, and the perforated area 10 is formed by the wood powder 6 filled in the grooves during the pressing process. It is not tightened and remains as a coarse part of the density, which gives a three-dimensional representation of the concentrated conduit, or the wood powder may fall off when slicing the secondary fritsch, resulting in a higher porosity. . As a result, the appearance and function of the conduit resemble natural ones, giving it a three-dimensional appearance. In other words, fidelity is improved. Also, since the porosity is large, the impregnation of paint is improved, and the wiping property is also improved. In addition, there is no need to use two types of raw material veneers, simplifying the manufacturing process.
This results in improved yield and reduced costs.

〔Effect of the invention〕

In this invention, raw material veneers are laminated with an adhesive interposed, sandwiched between flat templates and pressed to obtain a primary frit, and then this is perpendicular to the surface of the raw material veneer. A primary sliced veneer is obtained by slicing in a direction along the fiber direction, and then a concave groove is provided to this primary sliced veneer, and wood flour is filled in the groove to increase the density. A processed veneer with a rough portion formed thereon is obtained, which is then laminated with an adhesive interposed, and is sandwiched between templates having an uneven curved surface, and sequentially compressed, fritted, and sliced to obtain a laminated veneer. As a result, concentrated conduits faithful to natural ones can be expressed three-dimensionally, yields are good, and wiping properties can be improved.

[Brief explanation of the drawing]

Figure 1 shows the primary fritches obtained by the manufacturing process of this invention, Figure 2 shows the primary sliced veneer, Figure 3 shows the grooved veneer, and Figure 4 shows the processed veneer. is 2
Next, FIG. 6 is a perspective view of an embodiment of a laminated veneer obtained by the present invention. 1 is the primary fritsch, 2 is the primary slice veneer, 3
1 is a grooved veneer, 4 is a concave groove, 5 is a processed veneer, 6 is wood powder, 7 is a secondary fritsch, 8 is a laminated veneer, 9 is a non-porous area, and 10 is a perforated area.

Claims (1)

[Claims] 1 Raw material veneers are laminated with an adhesive interposed, and are clamped between flat templates to obtain a primary frit, which is then stacked in a direction perpendicular to the surface of the raw material veneers. , and slice it in the direction along the fiber direction to obtain a primary sliced veneer, then give the primary sliced veneer a concave groove, and fill it with wood flour to create a coarser density part. A processed veneer is obtained, which is then laminated with an adhesive interposed, and is sandwiched between templates having uneven curved surfaces, and sequentially subjected to compression, fritching, and slicing to obtain a laminated veneer. A manufacturing method for laminated veneer.