JPS597564B2 - Manufacturing method of artificial decorative veneer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing artificially decorated veneers.

A plurality of material veneers coated with adhesive are laminated, and these are pressed and bonded with a concave-convex mold to obtain a concave-convex deformed fritz, and this deformed fritz is sliced from a predetermined direction to laminate each of the aforementioned material veneers. In the manufacturing method of artificially decorated veneer, which expresses a wood grain pattern on the wood surface whose boundary surface is modeled on the annual ring lines, the two sides of the material veneer to be laminated during the pressure bonding process using the uneven mold are Since a larger pressure is applied, there is a drawback that poor adhesion is concentrated in the curved center of the resulting flitch.

This phenomenon in which the clamping pressure is unevenly distributed on the laminated material veneer is that at the center of the curved material veneer, the thickness direction of the laminated material veneer, that is, the normal direction, almost coincides with the pressing direction of the uneven shape. This is thought to be due to the fact that the normal direction deviates from the clamping direction at both sides, and the thickness measured in the clamping direction becomes larger at both sides than at the center.

Therefore, it is an object of the present invention to form a concavo-convex deformed flitch even under the above-mentioned pressing conditions, without concentrating poor adhesion between the material veneers in the curved central part, and uniformly over the entire surface. An object of the present invention is to provide a method for manufacturing an artificial decorative veneer that can achieve good adhesion.

An embodiment of the invention is shown in FIGS. 1 to 5.

That is, in the method of manufacturing this artificial decorative veneer, material veneers are laminated with an adhesive and pressed and bonded with a concave-convex mold to form a concave-convex deformed frit, for example, as shown in FIG. Assuming that the central part of the material veneer 1 is given uneven deformation, each material veneer 1 to be laminated as shown in FIG.
An adhesive 2 with a slow gelling time is applied to the central part of the adhesive 2, and an adhesive 3 with a quick gelling time is applied to both sides of the adhesive.

It is desirable that the reaction rate ratio of the adhesive 3 having a fast gelling time to the adhesive 2 having a slow gelling time is about 3:2.

When the concave-convex mold 4 shown in FIG. 2 has a curved surface where the angle θ between the contact surfaces t on both sides and the horizontal plane p is about 15V, the concave-convex mold 4 can be used to create a thickness of 10 m.
When 50 veneers of m material are laminated and pressed together to create uneven deformation,
It has been confirmed that there is a difference of 1.5 degrees in the laminated thickness between the central part and both sides. Below, we will discuss a specific example of forming a concave-convex deformed fritsch using the concave-convex mold 4 having the above-mentioned curved surface conditions. I will clarify.

As the material veneer 1, 1. OmmX 600mm
Using a sliced veneer of Merapi wood of 1800mm x 1800mm, dyed and treated to adjust the water content to 80%, a urethane adhesive was applied as the fast gelling adhesive 3 on both sides in the longitudinal direction over a width of 150mm. / m, and at the same time, apply 100 g/m of the same urethane adhesive having a reaction rate of about 2/3 compared to the adhesive as the adhesive 2 with a slow gelling time in the longitudinal direction over a width of 300 mm in the remaining central part. m and apply this at a pressure of 1 0 k9/c
300 sheets were laminated under the conditions of fjL and pressing time of 3 hours, and pressed and bonded using the uneven mold 4 to obtain a deformed frit.

The process of slicing the thus obtained deformed fritches in a predetermined direction to obtain veneers is no different from the conventional manufacturing method of artificial decorative veneers.

The two types of adhesives 2 and 3 are applied to the material veneer 1 as shown in FIG. A spreader 5 for spraying adhesive 2 and a spreader 6 for spraying adhesive 3 having a fast gel time are provided on both sides, respectively, and each material veneer 1 is conveyed to the installation area of these spreaders 5 and 6. This allows them to be done at the same time.

Furthermore, when using a concave-convex mold 4' as shown in FIG. 4, which is formed by having peaks and valleys on one pressing surface of the concave-convex deformed fritches, the principle of the adhesive application method is the same. and
In this case, as shown in FIG. 5, the adhesive 3 having a quick gelling time is applied to both sides of the material veneer 1 and to the portions corresponding to the curved portions 4'a of the curved surface of the uneven mold 4'. However, the adhesive 2 having a slow gelling time may be applied to the portions corresponding to the peaks and valleys of the curved surface of the uneven mold 4'.

Since the adhesive was applied to the material veneer 1 using the above-described processing method, for example, in the process of forming an arched concave-convex deformed frit as shown in FIG. Although the agent solidifies quickly, the clamping pressure is stronger than that applied to the central part, so it is fixed quickly and the temporary clamping is completed without any adhesion failure.

On the other hand, although the adhesive 2, which has a slow gelling time, is applied to the curved central part, the temporary compaction is completed early on both sides, so that it solidifies with a small amount of foaming under weak compaction pressure. The bonding is carried out slowly, and good adhesion can be achieved without any adhesion defects even in the central region.

Furthermore, since solidification occurs with a small amount of foaming in the center as mentioned above, there is no need to perform the degassing process that was performed in the conventional pressure bonding process, which simplifies the pressure bonding process. have

In addition, the method for manufacturing artificially decorated veneers of the present invention solves the phenomenon in which uneven pressing pressure that occurs in the process of laminating and press-bonding material veneers to obtain uneven deformation fritches causes poor adhesion between material veneers. As a means to prevent this, the type of adhesive applied to the material veneer is partially different, but the bias in the clamping pressure causes the difference in the laminated thickness between the center and both sides of the material veneer. Therefore, in the above-mentioned Shumei, a large amount of resin is applied to the part of the material veneer 1 where the adhesive 2 with a slow gelling time is applied, and a small amount is applied to the part where the adhesive 3 which has a quick gelling time is applied. By applying the resin, the difference in the laminated thickness can be corrected by the thickness unevenness of the applied resin, thereby preventing the clamping pressure from being uneven.

Note that by using a resin adhesive as the adhesive, the resin application process can also serve as an adhesive application process.

For example, in the case of pressure bonding treatment using a concavo-convex mold 4 as shown in FIG.
Furthermore, by applying 60 to 80 g/.1 layer on the center part, the coating thickness on both sides becomes 100 to 12
0 g/m, coating thickness at the center is 160-200 g/m'
Therefore, the thickness difference can be corrected.

In addition, when using a concave-convex mold 4 as shown in FIG. 4, which forms both peaks and valleys on one pressing surface of the concave-convex deformed flitch, resin or resin bonding is applied to the entire surface of the material veneer 1. 100 to 120.9/m of the adhesive, and then layered on the areas where the adhesive 2 with a slow gelling time described above was applied, that is, the areas corresponding to the peaks and troughs of the curved surface of the uneven mold 4'. By applying the coating at a rate of 60 to 809/rn', it is possible to correct the difference in laminated thickness due to uneven deformation.

As described above, the method for producing an artificial decorative veneer of the present invention includes a step of press-bonding laminated material veneers with an adhesive in a concave-convex mold to form a concave-convex deformed fritches curved in an arcuate shape. An adhesive with a slow gelling time is applied to the curved central part of each veneer, and an adhesive with a quick gelling time is applied to both sides of the veneer, and the adhesive is pressed and bonded. , the poor adhesion between the material veneers is concentrated in the curved central part of the unevenly deformed flitch,
Good adhesion can be achieved over the entire surface, and since the gelation of the adhesive is slow and the amount of foaming is small in the curved central portion of each material veneer, the amount of foaming is small. This has the effect that the degassing process that is performed in conjunction with the process can be omitted.

[BRIEF DESCRIPTION OF THE DRAWINGS] Fig. 1 is a perspective view showing the process of applying adhesive to a veneer of material in an embodiment of the present invention, and Fig. 2 is a front view showing the pressure bonding process using a concave-convex mold according to the embodiment. Fig. 3 is a plan view showing a specific example of the adhesive application process shown in Fig. 1, and Fig. 4 is a front view showing an example of another uneven type that can be applied to the pressure bonding process to which the present invention is applied. , and FIG. 5 is a perspective view showing the step of applying adhesive to the material veneer, which is performed during the pressure bonding step. 1...Material veneer, 2,3...Adhesive,
4. 4'... Concave and convex type, 5,6... Spretsuda.

Claims (1)

[Claims] 1. A method for manufacturing an artificial decorative veneer in which material veneers are laminated with an adhesive and pressed and bonded with a concave-convex mold to form a concave-convex deformed fritch curved in an arcuate shape, and this fritch is sliced. An artificial material characterized by applying an adhesive with a slow gelling time to a corresponding part of the veneer of each material, which is the central part, and applying an adhesive with a quick gelling time to both sides of the adhesive and press-bonding the same. Method of manufacturing decorative veneer.