KR20160117768A - Sliced veneer moldings production method of the three-dimensional shape - Google Patents

Abstract

Provided is a method for producing a three-dimensionally molded wood veneer According to the present invention, the method for producing the three-dimensionally molded wood veneer comprises the following steps: (a) pre-treating a surface of a wood veneer; (b) supplying the surface-treated wood veneer and a glass fibrous composite material; (c) bonding the wood veneer on an upper side of the supplied glass fibrous composite material so as to produce a wood veneer bonded sheet; and (d) producing the three-dimensionally molded wood veneer by press-molding the wood veneer bonded sheet. The method of the present invention can remarkably reduce burst and tear conventionally occurring along the grain on the wood veneer.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a three-

The present invention relates to a method of manufacturing a three-dimensional patterned wood-like molded product, and provides a woody pattern improved in workability by improving tensile strength and elongation property by pretreating the laminated wood to a glass fiber composite material, The present invention relates to a method of manufacturing a three-dimensional patterned wood product.

In recent years, Korean Patent Laid-Open No. 10-2008-0024713 discloses a product which is attached to one surface of a case by using a wood material such as a veneer.

When the veneer is attached to one side of the case, the veneer not only gives a natural feeling but also does not react sensitively to the external temperature due to the inherent physical properties of the wood, thereby reducing the feeling of cold during transportation and artificially expressing it psychologically It is possible to give a feeling of not being beautiful.

However, the veneer obtained by cutting wood is difficult to bond with heterogeneous materials such as plastic or metal, and has a disadvantage in that post-transformation occurs due to different physical properties after bonding.

In addition, when the veneer used in the case is thickened, it has a disadvantage inherent in wood such as it is easily split along the grain due to the inherent characteristics of the wood. In addition, when the veneer is made thin, the compression, tensile and tear strength are weak There is a disadvantage that it breaks easily after being attached or the surface breaks.

In addition, these veneers are highly absorbent to absorb moisture, and when they absorb moisture, they undergo linear expansion and volumetric expansion, and when they lose moisture, they undergo bow axis and volume contraction.

In addition, the veneer, when applied to heat, is much less compacted than when it absorbs moisture, but it undergoes linear expansion and volume expansion.

In addition, because of the anisotropy of the wood (the anisotropy of the wood, the properties of the wood such as the fiber direction, the tangential direction and the radial direction are different from each other in physical properties such as moisture and heat shrinkage and expansion rate), the veneer is unstable in size, There is a disadvantage that it is irregularly deformed such that it is bent or twisted. The contraction and expansion of the veneer due to the entry and exit of moisture and heat is a problem in that even if the veneer is painted, it is not completely removed unless the movement of moisture is completely blocked.

In the present invention, the surface of a laminated wood is pretreated with an aqueous urethane coating liquid which is an environment-friendly material to improve the tensile strength and elongation of the laminated wood, and then the glass fiber composite material and the pretreated laminated wood are joined together to produce a laminated wood laminated sheet, It is an object of the present invention to provide a three-dimensionally shaped patterned wood product manufacturing method in which a laminated sheet is press-molded so that the phenomenon of breaking or tearing along the grain of the laminated wood is remarkably reduced.

A method of manufacturing a three-dimensional patterned wood product according to the present invention comprises the steps of: a) pretreating a surface of a laminated wood, b) supplying a veneer and a glass fiber composite material whose surface has been pretreated, and c) And d) press-molding the laminated wood sheet to produce a three-dimensional patterned wood product.

The step of pretreating the surface of the laminated wood according to the present invention comprises the steps of a-1) providing the laminated wood, a-2) impregnating the provided laminated wood into the water tank containing the urethane coating liquid for a predetermined time And a-3) removing the filtrate remaining on the surface of the veneer after collecting the veneer impregnated in the water tank containing the urethane coating solution, and a-4) passing the veneer having the filtrate removed from its surface through an oven And drying.

In the step of impregnating the provided veneer, which is the step a-2) according to the present invention, into a water tank containing the urethane coating solution for a predetermined time, the urethane coating solution is preferably water-soluble.

Further, in the step of forming a three-dimensional molded article by press molding the laminated laminated sheet according to the present invention, the laminated laminated sheet may be produced by pressing the laminated laminated sheet at a temperature of 90 to 100 ° C After preheating with a heater, pressing pressure is applied to the press mold for 20 seconds to mold a three-dimensional patterned molded article.

The effect of the method of producing a three-dimensionally shaped green pattern molding according to the present invention is as follows.

The surface of the laminated wood is pretreated with a urethane coating liquid to improve the tensile strength and stretchability of the laminated wood, and then the glass fiber composite material and the pretreated laminated wood are joined to each other to produce a laminated wood laminated sheet, It has the effect of significantly reducing the phenomenon of breaking or tearing along the grain of the veneer as in the prior art.

Fig. 1 is a photograph of the surface of a vignetting image enlarged and photographed.
2 is a photograph of a surface of a laminated wood impregnated with an aqueous urethane coating solution according to the practice of the present invention in an enlarged photograph.
3 is an enlarged photograph of the surface of a laminated wood impregnated in a milky urethane coating liquid according to the practice of the present invention.
Fig. 4 is a schematic view showing an embodiment of a method of manufacturing a three-dimensional patterned wood product according to the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Prior to this, terms and words used in the present specification and claims should not be construed as limited to ordinary or dictionary terms, and the inventor should appropriately interpret the concepts of the terms appropriately The present invention should be construed in accordance with the meaning and concept consistent with the technical idea of the present invention.

Therefore, the embodiments described in the present specification and the configurations shown in the drawings are merely the most preferred embodiments of the present invention, and not all of the technical ideas of the present invention are described. Therefore, at the time of the present application, It should be understood that variations can be made.

Fig. 2 is a magnified photograph of the surface of a laminated wood impregnated with an aqueous urethane coating solution according to the practice of the present invention. Fig. 3 is a photograph of the surface of a laminated wood, Fig. 4 is a schematic view showing an embodiment of a method for producing a three-dimensionally patterned wood product according to the present invention.

The present invention relates to a method for manufacturing a three-dimensional patterned wood mold product which is easy to mold into a 3D stereoscopic shape by providing a veneer having improved workability by improving tensile strength and stretchability by pretreating the veneer before bonding to a glass fiber composite material Referring to the drawings, the following will be described.

1 to 4, a method of manufacturing a three-dimensional patterned wood product according to the present invention comprises the steps of: a) pre-treating the surface of the laminated wood 10;

At this time, the pretreatment of the surface of the laminated wood 10 is performed by an impregnating process. In more detail, the laminated wood 10 is provided in step a-1).

The veneer 10 provided at this time is made by making natural wood as thin as paper. The veneer 10 can be selectively and continuously supplied in a state of being wrapped around a roll in accordance with the process, or the veneer can be cut in a specified width and supplied in a sheet form .

Fig. 1 is an enlarged photograph of the surface of a vignetting. It can be seen that the grain is very irregular and the pores are large. The grain is very irregular and the pore is large, the formability of the vignetting itself is low. A phenomenon occurs.

In step a-2), the veneer 10 provided is impregnated in the water tank 1 containing the urethane coating liquid 20 for a predetermined period of time.

At this time, impregnation is performed so that the urethane coating liquid 20 can sufficiently penetrate the surface of the veneer 10. The impregnation time of the veneer 10 can be selectively adjusted to adjust the impregnation rate.

Then, in step a-3), the veneer 10 impregnated in the water tank 1 containing the urethane coating liquid 20 is collected, and then the filtrate remaining on the surface of the veneer 10 is removed.

At this time, it is preferable to arrange the rubber squeegees 2 on upper and lower surfaces of the veneer 10 to remove the urethane coating solution 20 remaining on the surface of the veneer 10 by the rubber squeegees 2.

Then, in step a-4), the vignette 10 from which the filtrate has been removed from the surface is passed through the oven 3 and dried.

At this time, it is preferable to maintain the internal temperature of the oven 3 at a temperature of 70 to 90 캜, and the veneer 10 coated with the urethane coating liquid 20 is dried for 30 seconds.

FIG. 2 is an enlarged photograph of the surface of a laminated wood impregnated with an aqueous urethane coating solution according to an embodiment of the present invention. The urethane coating liquid is coated on the surface of the laminated wood, and the urethane coating liquid is buried in the interstices and pores.

At this time, the urethane coating liquid 20 used is water-based and environmentally friendly, and the impregnation process is easily carried out, and the average impregnation rate is 11%.

FIG. 3 is an enlarged photograph of the surface of the laminated wood impregnated with the oil-based urethane coating liquid according to the practice of the present invention. It can be seen that the urethane coating liquid is filled in the interstices and pores, and the natural wood veneer is water- In the case of the oil-based type rather than the aqueous type, the coating is thicker on the surface than the veneer pore filling, and the average impregnation rate is 15%.

Next, in step b), the veneer 10 and the glass fiber composite material 30 which have been pretreated by the step a) are supplied.

At this time, the pretreated laminated wood 10 and the glass fiber composite material 30 are preferably supplied in a roll-to-roll manner.

Next, in step c), a laminated wood sheet 40 is prepared by laminating a pretreated laminated wood 10 on the upper surface of the glass fiber composite material 30 to be supplied.

At this time, the lamination of the laminated wood 10 and the glass fiber composite material 30 is made by an adhesive layer. The adhesive layer is made of a TPU film. When the pretreated laminated wood 10 and the glass fiber composite material 30 are supplied And the prepregs 10 and the glass fiber composite material 30 are placed between the pretreated laminated wood 10 and the glass fiber composite material 30 and heated to a temperature of 150 to 200 캜 and a pressure of 10 to 30, And the pretreated laminated wood 10 and the glass fiber composite material 30 are joined together to form a laminated wood sheet 40.

Next, in step d), the laminated wood sheet 40 is press-formed to produce a three-dimensional patterned wood product.

At this time, when the laminated sheet 40 is press-molded, the laminated laminated sheet 40 is preheated by the infrared heater 4, and press molding is applied to the press mold 5 to form a three- The glass fiber composite material 30 side of the laminated sheet 40 is heated by an infrared heater 4 to have a surface temperature of 90 to 100 캜 and pressed by a press mold 5 for 20 seconds to be molded desirable.

The following [Table 1] is a table comparing and comparing the samples of the three-dimensional patterned wood product produced according to the preheating time and the surface temperature of the laminated wood sheet.

No Preheating time (infrared heater) Surface temperature of laminated sheet Aqueous urethane Top Lower end One 17 seconds 80 to 90 ° C Cracks and dents appear on the exterior
(1) Upper part: crack
(2) Lower end: tear

2 20 seconds 90 ~ 100 ℃ Good appearance
(1) Top: Good
(2) Lower part: Good

3 23 seconds 100 to 110 ° C Crack in appearance
(1) upper part: large amount of cracks
(2) Lower end: Overall micro crack occurrence

As shown in the above Table 1, the optimal molding conditions of the aqueous urethane are 20 ° C. for the infrared ray heater, and when the heat is applied to the glass fiber composite material portion, the glass fiber composite material exhibits optimal molding characteristics at a surface temperature of 90 to 100 ° C.

No Preheating time (infrared heater) Surface temperature of laminated sheet Oil-based urethane Top Lower end One 20 seconds 90 ~ 100 ℃ Crack in appearance
(1) upper part: large amount of cracks
(2) Lower end: fine crack

2 22 seconds 100 to 110 ° C Crack in appearance
(1) upper part: large amount of cracks
(2) Lower end: tearing occurred

3 24 seconds 110 ~ 120 ℃ Crack in appearance
(1) upper part: large amount of cracks
(2) Lower end: tearing occurred

As shown in the above Table 2, in the case of the urethane urethane in which the heat characteristic is higher than that of the aqueous urethane, the surface cracking and cracking phenomenon is observed even though the surface temperature of the glass fiber composite material is increased to 110 캜.

This is because cracks and tears are caused by the difference in thermal expansion characteristics between the oil-based urethane coating layer and the glass fiber composite material, and therefore, it is preferable to use an aqueous urethane coating solution.

Further, in the case of aqueous urethane, it is more suitable for forming a veneer because it is an emulsion type and has a viscosity controllability and easy workability and a flexible main chain.

The above process according to the present invention significantly reduces the phenomenon of bursting or tearing along the grain even if the laminated wood itself is press-formed into a 3D shape.

Therefore, the productivity of the veneer product having 3D stereoscopic shape is increased.

While the present invention has been described with reference to exemplary embodiments, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims. Accordingly, the true scope of the present invention should be determined by the technical idea of the appended claims.

1: aquarium
2: Rubber squeegee
3: Oven
4: Infrared heater
5: Press mold
10: Wood veneer
20: Urethane coating liquid
30: Fiberglass composite material
40: laminated wood sheet

Claims (4)

a) pre-treating the surface of the veneer;
b) providing a veneer and glass fiber composite material having a surface pretreated;
c) preparing a laminated wood sheet by laminating a laminated wood on the upper surface of the glass fiber composite material to be supplied; And
and d) press-molding the laminated wood sheet to produce a three-dimensional laminated wood product.
The method according to claim 1,
The step of pre-treating the surface of the laminated wood, which is the step a)
a-1) providing a veneer;
a-2) impregnating the veneer provided with a urethane coating solution-containing water tank for a predetermined period of time;
a-3) collecting the veneer impregnated in the water tank containing the urethane coating liquid, and then removing the filtrate remaining on the surface of the veneer;
a-4) a step of drying the veneer on which the filtrate is removed by passing the veneer through an oven.
The method of claim 2,
In the step of impregnating the veneer provided in step a-2) into the water tank containing the urethane coating solution for a predetermined time,
Wherein the urethane coating liquid is water-soluble.
The method according to claim 1,
In step (d) of producing a three-dimensional molded product by press molding the laminated wood sheet,
Wherein when the green laminated sheet is press molded, the green laminated sheet is preheated by an infrared heater so that the surface temperature of the green laminated sheet becomes 90 to 100 ° C, and then pressed by a press mold for 20 seconds to form a three- A method of manufacturing a molded article.

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