JPH03211006A - Manufacture of coated woody decorative veneer - Google Patents

Abstract

PURPOSE:To shorten the drying time and upgrade uniformity of drying and accuracy of applying a coating material by mixing a cure accelerating agent for a sealer in the manufacturing process before applying a UV coating and accelerating curing of the sealer at the time of coating in the after-processing. CONSTITUTION:First, timber thin pieces 1 manufactured by slicing a timber is dyed and dried and a bonding agent is applied. Then, the same is compression molded by a pressing device 2 to form a flitch 3, and a wooden decorative veneer 5 is formed by being sliced with a slicing blade 4. A cure accelerating agent is mixed when the timber thin pieces 1 are dyed, or mixed into the bonding agent for bonding the timber thin pieces 1 each other. In the coating process, first a sealer 11 is applied to the surface of the timber decorative veneer 5 and sealed thereon, dried and cured and then a UV coating material 12 is applied to manufacture a coated woody decorative veneer. Then, in the dry curing process, curing of the sealer 11 is accelerated by the cure accelerating agent mixed into the woody decorative veneer 5 to cure the sealer uniformly, shorten the manufacturing time and carry out accurate application of UV coating material 12.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is a decorative wood veneer that is formed by pressing and molding thin wood pieces into blocks using an adhesive as a binder, and slicing the 7-rich blocks. The present invention relates to a method for manufacturing a painted decorative wood veneer, in which the painted decorative wood veneer is manufactured by painting the decorative wood veneer.

[Prior Art] The applicant of the present invention has already filed a patent application for a technique in which decorative wooden veneers are manufactured by pressing and forming thin pieces of wood into blocks using an adhesive as a binder, and slicing the blocks. It has been filed as No. 62-211756. The surface of this decorative wood veneer is then painted to produce a painted decorative wood veneer.

[Problem to be Solved by the Invention 1] By the way, painting the surface of the decorative veneer with a solvent-free paint such as UV paint as described above is because the decorative wood veneer as described above has many voids. Since the product will not be smooth as it is, it must be painted with a solvent-free paint such as UV paint. However, since the decorative wood veneer mentioned above contains a UV absorber, it is not possible to apply UV paint directly to it, and in order to prevent UV paint from being absorbed into the decorative wood veneer, It is necessary to apply a sealer to seal the area before application. The problem at this time is that it is necessary to seal the sealer sufficiently after applying the sealer, and if the sealer is insufficiently sealed, air cannot be removed from the wood decorative veneer sufficiently, causing foaming when applying the UV paint. (In particular, unlike solvent-based paints, UV paints have a high viscosity and are difficult to degas.) Furthermore, after applying the sealer, it is dried and cured for 1 to 2 days before the UV paint is applied, which poses a problem in productivity. Also, apply the sealer's curing accelerator on a separate roll,
It may be possible to accelerate the drying of the sealer, but since the wood decorative veneer itself absorbs a lot, there is a problem in that the curing accelerator is absorbed unevenly, resulting in uneven drying of the sealer.

The present invention was invented in view of the above problems, and
The objective is to accelerate the curing of the sealer and shorten the drying time, and also to create a painted wood decorative veneer that can be coated with UV paint accurately without uneven drying of the sealer. To provide a manufacturing method.

[Means for Solving the Problems] The method for manufacturing a painted wooden decorative veneer of the present invention involves slicing a 7-rich piece 3 formed by applying an adhesive to a thin piece of wood 1 and forming it into a block by compression molding. A sealer 11 is applied to the obtained wooden decorative dayboard 5 to seal it, and then U
When manufacturing a painted wood decorative veneer by applying the V-paint 12, a curing accelerator of the sealer 11 is mixed into the wood decorative veneer 5 during the manufacturing process of the wood decorative veneer 5 before painting, and during the subsequent painting process. It is characterized by accelerating the curing of the sealer 11, and by adopting such a configuration, the problems of the conventional example described above are solved.

[Function] Therefore, by mixing the curing accelerator of the sealer 11 in the manufacturing process of the decorative wood veneer 5, when sealing the decorative wood veneer 5 by applying the sealer 11 in the subsequent process,
The curing accelerator of the sealer mixed in the decorative wood veneer 5 accelerates the curing of the sealer 11, and moreover, the curing of the sealer 11 is promoted uniformly in each part, so that the drying of the sealer 11 becomes uniform and the application of the UV paint 12 is facilitated. Now I can do it accurately.

[Example] The present invention will be described in detail below based on examples.

The decorative wood veneer 5 used in the present invention is manufactured as follows. That is, as shown in Fig. 1, a slice of wood is first dyed, then dried,
Next, an adhesive is applied to the wood thin piece 1, and then the wood thin piece 1 is pressed and molded in a press device 2 to form 7 pieces 3, and the 7 pieces 3 are sliced with a slicing blade 4 to form a decorative wood veneer 5. is formed. As shown in Figure #2, the wood slice 1 has a thickness t of 0.05 to 0.80 mm (preferably 0.10 to 0.50 mm) and an area of 6 to 400 m.
1n2 (preferably 25 to 250IIIn2), and the aspect ratio (vertical width a/width b) is 0.4 to 7. O (preferably 0.8-3.0). These wood flakes 1 may be twisted. Further, as long as the above shape accounts for 60% or more, dimensions other than the above may be included.

Chemical treatments include dyeing treatments, insect repellent treatments, antiseptic treatments, and flame retardant treatments. The dyeing process is carried out, for example, by immersing the inner basket 8 containing the wood slices 1 in the dyeing liquid 7 in the dyeing tank 6, as shown in FIG. The adhesive is applied to the wood slices 1 by spraying or kneading.

The type of adhesive is not particularly limited as long as it has a hardness that allows slicing after adhesion, but the following adhesives are considered suitable. Examples include urethane adhesives, urethane emulsion adhesives, soft polyester resins (elongation rate of 40% or more), vinyl acetate adhesives, and the like. Pressure forming of the thin wood piece 1 coated with adhesive is carried out by a press device 2, and as shown in FIG. The pressure applied by this press device 2 is sufficient to crush the wood flakes 1 along the press surface, and is 2 Kg/
cm2-25 Kg/coo2 (preferably 7Kg
/cm2-14 Kg/can2).

The wood decorative veneer 5 obtained as described above is mixed with a curing accelerator during the manufacturing process to accelerate the curing of the sealer used in the painting process described later.

That is, the curing accelerator is mixed, for example, when the wood thin pieces 1 are dyed, or mixed into an adhesive for bonding the wood thin pieces 1 together. Metal ions and amines are used as curing accelerators. Examples of metal ions include dibutyltin dilaurate, and examples of amines include triethylamine. The amount added is equivalent to 0.01 to 1% of the amount of sealer applied in the next step.

Therefore, in the present invention, the decorative wood veneer 5 mixed with the curing accelerator obtained as described above in the manufacturing process is adhered to a substrate 13 such as plywood with an adhesive, and then the surface of the decorative wood veneer is In this painting process, first, a sealer 11 such as urethane sealer is applied to the surface of the decorative wood veneer 5 to seal it, and this is dried and cured, and then UV paint is applied. 12 to obtain a painted wood decorative veneer (in the embodiment shown in FIG. 3, this painted wood decorative veneer is laminated on a substrate 13 such as plywood). In the drying and curing process of the sealer 11, the curing accelerator of the sealer 11 mixed into the decorative wood veneer accelerates the curing of the sealer 11, and the sealer 11 is evenly cured, reducing the manufacturing time and the accuracy of the UV paint 12. This makes it possible to apply various coatings.

Specific examples and comparative examples will be described below.

Example> A wooden decorative veneer 5 obtained by slicing a 7-rich piece 3 formed by applying an adhesive to a thin wood piece 1 and forming a block by pressure molding is placed on a wooden base material 11 with an adhesive. 12, triethylamine is added in an amount equivalent to 0.01 to 1% of the application amount of the urethane sealer 11 used in the subsequent process during the manufacturing process of the wood decorative veneer 5 and the dyeing process of the raw wood thin slices 1. was added. The decorative wood veneer 5 obtained as described above is bonded to a plywood board to be used as a substrate 13, and after surface polishing, a urethane sealer 11 is applied for 30 minutes.
After applying 0 to 50 g/l 112 and drying at 50 to 60°C for 5 minutes, UV paint 12 was applied and the surface was finished to a smooth surface using a 70-coater. What I obtained in this way is UV paint 1
No fine foaming occurred after coating No. 2 and drying, and there was no problem in appearance quality.

Comparative Example> Decorative wood veneer 5 was manufactured in the same manner as in the example except that the curing accelerator of the sealer 11 was not added, and the decorative wood veneer 5 was bonded to plywood used as the substrate 13 in the same manner as in the example. Then, after surface polishing, apply urethane sealer 11 at 30~5
After applying 0g/ff12 and drying at 50-60℃ for 5 minutes,
Although UV paint 12 was applied, fine foaming occurred after the UV paint 12 was applied and dried, resulting in a deterioration in appearance quality.

[Effect of the invention 1] As described above, the present invention applies a sealer to a decorative wooden veneer obtained by slicing 7-rich pieces formed by applying adhesive to thin wood pieces and forming blocks by pressure molding. When manufacturing painted decorative wood veneers by sealing them and then applying UV paint, a hardening accelerator of a sealer is mixed into the decorative wood veneers during the manufacturing process of the decorative wood veneers before painting. Since the curing of the sealer is accelerated during painting, the curing accelerator of the sealer mixed into the decorative wood veneer accelerates the curing of the resealer, and the curing of the sealer is promoted uniformly in each area, eliminating uneven drying of the sealer. This allows accurate application of UV paint.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram showing the manufacturing process of an embodiment of the present invention, Fig. 2 is an enlarged perspective view of the same wood flake as above, and Fig. 3 is a painted wooden decorative veneer bonded to a substrate such as plywood. 1 is a cross-sectional view showing the condition, 1 is a thin piece of wood, 3 is 7-rich, 5 is a wood decorative veneer, 11 is a sealer, and 12 is a UV paint.

Claims (1)

[Claims] [1] A decorative wood veneer is obtained by applying adhesive to a thin piece of wood and slicing the flitch formed into a block by pressure molding.A sealer is applied to the wood decorative veneer to seal it, and then UV paint is applied. When manufacturing painted decorative wood veneers, we mix a sealer curing accelerator into the decorative wood veneers during the manufacturing process of the decorative wood veneers before painting to accelerate the curing of the sealer during painting in the subsequent process. A method for producing painted wood decorative veneers.