KR20080091737A - A method of strong to surface for wood goods - Google Patents

Abstract

A method for reinforcing the surface of wood products is provided to remove the limitations of places and purposes by increasing material property and to supply the products with long durability at low cost. In a method for reinforcing the surface of wood products having a natural sliced veneer(12a) or a wooden veneer(12b) decorated on the upper side of plywood or wooden panels, a coating agent(14) is applied, dried, and pressed while passing through rollers(15a,15b,15c,15d). The coating agent is produced by mixing melamine liquid resin of 80~99wt.% and one of butyl acrylate-vinyl acetate liquid resin, vinyl acetate liquid resin, urethane liquid resin, and epoxy liquid resin of 1~20wt.%. If the natural sliced veneer of 1.0mm is attached on the surface of the product, the mixed coating agent is applied, dried, and pressed while passing through the rollers at 30~80g/m^2.

Description

Surface Hardening Treatment of Wood Products {A METHOD OF STRONG TO SURFACE FOR WOOD GOODS}

The present invention relates to a surface strengthening treatment method of a wood-based product, more specifically, a melamine-based liquid coating agent primarily on the material of the finished timber product to which the natural veneer or wood veneer attached to the top of the plywood or wood-based plate material (80 wt% to 99 wt%) and butyl acrylate-vinyl acetate liquid resin or vinyl acetate liquid resin or urethane liquid resin or epoxy liquid resin are mixed at a constant ratio (1 wt% to 20 wt%), The coating is first carried out using a roller and then semi-dried in a dryer that can be applied to a temperature condition of 80 ° C. to 250 ° C., which can control the height, the day and the calorific value while transferring to the speed-adjustable conveyor 19. And, by loading the melamine sheet, the second transparency is secured on top of the finished material, a constant temperature (100 ℃ or more and 200 ℃ or less) and pressure (7kg / ㎠ By using a mold press plate is attached to a 35g / ㎠ below) the upper side that can be held pressed in the approximately 4 seconds to 3 minutes to a method for strengthening a surface of a wood-based product.

Conventional wood products, especially wood floor surface treatment method is generally treated with UV urethane paint surface, this method is not only a high mechanical cost, but also the scratch resistance, wear resistance, and cracking of the surface in the quality of the product It is difficult to manage by manufacturers and users due to the weakness of the resistance, peeling resistance and impact resistance.

In addition, in recent years, in order to make up for the disadvantages of UV urethane surface treatment, there is developing a technology for impregnating melamine in natural veneer or artificial veneer, but this method has a very strong melamine in natural veneer or artificial veneer itself. Due to the impregnation with liquid resin only, the melamine-based resin hardens due to its strong physical properties, causing problems such as natural veneer, artificial veneer warping, cracking, warping, etc. In order to compensate for problems such as bending and warping, the process of attaching a thick plate on the lower side of natural veneer or artificial veneer is added, rather it is more expensive than the surface treatment cost of the existing UV urethane coating method and is thicker than veneer (thickness 1mm). Wood boards are continuously at high temperature and high pressure. When applied as a moisture containing in the interior of the wood plate member abruptly discharged due to manufacturing problems, such as occurrence of cracks and warpage is not possible to enhance the surface in a conventional veneer impregnation method.

Therefore, the present invention not only reduces the mechanical cost compared to the conventional UV urethane coating method, but also has a butyl-vinyl acetate-based resin or vinyl acetate-based liquid resin containing elastic properties in a strong melamine-based liquid resin. Resin or urethane liquid resin or epoxy liquid resin is mixed, and the surface treatment technique is a high pressure press method, not a roller method, which is a conventional coating method, so that the product is surface treated with a conventional UV urethane paint and a conventional natural veneer or artificial veneer Excellent scratching, abrasion resistance, cracking resistance, peeling resistance, impact resistance and warping resistance than the product directly impregnated with melamine liquid resin. Melamine liquid to conventional natural veneer or artificial veneer itself As well as significantly superior productivity than the method of impregnating the resin directly, the production costs at the expense of the cost will be capable of supplying high quality products to consumers at reasonable prices.

Accordingly, the present invention has been made in view of the conventional technical problems, and its object is to provide a melamine-based liquid coating agent (80 wt% to 99 wt%) and a butyl-vinyl acetate liquid resin or vinyl acetate in a finished product. Mixing liquid resin or urethane liquid resin or epoxy liquid resin in a constant ratio (1% by weight to 20% by weight), and coating it first using a roller, and then to a speed control conveyor 19 Semi-drying in a dryer that can be applied to 80 ℃ to 250 ℃ temperature conditions that can control the height, day and calorific value while transporting, and by placing the melamine sheet with secondary transparency on top of the finished material 4 seconds to a press using a mold plate attached to the upper side where the temperature (100 ° C. or more and 200 ° C. or less) and the pressure (7 kg / cm 2 or more and 35 kg / cm 2 or less) can be maintained. By strengthening the surface of wood products by pressurizing for about 3 minutes, especially when applied to wood flooring, it can be used anywhere, such as residential, commercial, gymnasium, or school classroom. It is to provide consumers with products that are much longer than existing products at low cost.

In order to achieve the above object, the surface strengthening treatment method of the wood product of the present invention is a melamine liquid resin (80% by weight to 99% by weight) and acrylic acid butyl-vinyl acetate liquid resin or vinyl acetate liquid resin or urethane liquid Preparing a coating agent 14 by mixing a resin or epoxy liquid resin in a constant ratio (1% by weight to 20% by weight), and using the coating agent while passing through the rollers 15a, 15b, 15c, and 15d. Coating it on the finished products (11, 12a, 12b) and transferring the finished products to the conveyor (19) using a hot air or heater (18) to apply a temperature condition of 80 ℃ to 250 ℃ Semi-drying step in the dryer 17, and the semi-drying is completed by loading the melamine sheet 20 secured transparency on the upper part of the product (16a, 16b) is completed at a constant temperature (more than 100 ℃ 200 ℃) and pressure ( 7 kg / cm 2 or more and 35 kg / cm 2 or less) using the presses 21a and 21b with the mold plate 22 attached to the upper side to hold the surface of the wood product by a time of about 4 seconds to 3 minutes. Strengthening (23).

Surface strengthening treatment method of the wood product of the present invention configured as described above will be described in detail as follows through the accompanying drawings and embodiments.

1 is a coating (11, 12a, 12b, 16a) of the finished product by using the mixed coating agent 14 of the surface hardening treatment method of the wood product of the present invention, the semi-drying using a dryer 17 Fig. 2 is a view showing the step of loading the melamine sheet 20 having transparency secured to the upper side of one product 11, 12a, 12b, 16b, and Fig. 2 is a view showing the surface hardening treatment method of the wood product of the present invention. .

The finished product used in the present invention refers to a plywood or wood-based (medium density fiberboard (MDF) or high density fiberboard (HDF) of a constant thickness (generally referred to as a thickness of 3.0mm to 12.0mm) for producing wood products ), Or the width of the solid wood to 5.0mm or more and 120mm or less and processed in a state of 3.0mm or more to 12.0mm thick} the natural veneer (12a) or wood veneer (12b) on the upper side of the plate-like material (11) The bonded product is called.

The present invention is a melamine liquid resin (80% by weight to 99% by weight) and acrylic acid butyl-vinyl acetate liquid resin or vinyl acetate liquid resin or urethane liquid resin or epoxy liquid resin for coating on the finished product. To a constant ratio (1% to 20% by weight) to prepare a coating agent (14).

At this time, 80% to 99% by weight of the melamine liquid resin is 1% to 20% by weight of any one of butyl-vinyl acetate liquid resin or vinyl acetate liquid resin or urethane liquid resin or epoxy liquid resin. It is preferable to mix with.

This is because when the butyl acrylate-vinyl acetate liquid resin, vinyl acetate liquid resin, urethane liquid resin, or epoxy liquid resin is mixed at less than 1% by weight, the strength of the melamine liquid resin itself cannot be alleviated. The surface cracking of the product occurs after the surface strengthening treatment is completed, if the mixing exceeds 20% by weight, the strength of the melamine liquid resin is too low or the transparency of the product after the surface treatment tends to be inferior.

The coating 14 mixed as described above is stored in the mixing reservoir 13 and passed through rollers 15a, 15b, 15c, and 15d as shown in FIG. The coating is applied so that the amount may be from 200 g / m 2.

If the surface of the finished product (11, 12a, 12b) is a natural veneer 12a (wood is thinly processed to a thickness of 1.0mm or less), the mixed coating material 14 is not less than 30g / m 2 and not more than 80g / m 2 It is preferable to apply the coating material, and when the surface of the finished product (11, 12a, 12b) is a single plate 12b (wood is processed thicker than natural veneer with a thickness of more than 1.0mm and 5.0mm or less) It is preferable to apply | coat (14) at 80 g / m <2> or more and 200 g / m <2> or less.

When the coating agent is applied while passing through the rollers 15a, 15b, 15c, and 15d, the strength of the surface of the product is weakened when applied to the veneer product at less than 30g / m2. This cracking phenomenon may occur.

In addition, if the surface is applied to the product of a single plate less than 80g / ㎡ the strength of the surface of the product is weakened, if more than 200g / ㎡ applied may cause the phenomenon that the surface of the product cracks.

When the step of applying the coating on the finished product while passing through the rollers (15a, 15b, 15c, 15d) is completed (16a), the product is transferred to the conveyor (19) using a hot air or heater 18 to 80 ℃ Semi-drying (11, 12a, 12b, 16b) is carried out in a dryer 17, which can be subjected to a temperature condition of 250 ° C., and the melamine sheet 20 having transparency is cut to fit the width of the finished product. As shown in FIG. 2, the semi-drying is finished on the top of the product (11, 12a, 12b, 16b).

Dryer used in the present invention can be used in all four sides open or closed all sides, the conveyor 19 is good to use the one that can freely control the feed rate, hot air or heater is also high, low on the upper side of the product It is a good idea to use something that you can freely control.

The reason for using the above is to control the time of semi-drying and the condition of semi-drying because the amount of coating liquid varies depending on the species or thickness of the finished product.

In addition, the melamine sheet 20 which ensures transparency used in the present invention uses a sheet in which silica-based or alumina-based particles having a basis weight of 10 to 80 g / m 2 are evenly distributed.

As described above, the melamine sheet 20 having transparency is loaded (11, 12a, 12b, 16b, 20) on the upper side of the finished product after the semi-drying is finished (11, 12a, 12b, 16b) and presses it. The mold plate on the side of the upper portion 21a, on which the constant temperature (100 ° C or more and 200 ° C or less) and pressure (7kg / cm2 or more and 35kg / cm2 or less) can be maintained after placing on the bottom surfaces 21b of the 21a and 21b. It presses for 4 second-about 3 minutes using the presses 21a and 21b with (22) attached.

At this time, it is preferable that the mold plate 22 attached to the upper portion 21a side of the press use a thickness of 1.0 mm to 5.0 mm of stainless steel.

The mold plate 22 has an influence on determining physical properties such as transparency and glossiness of the product. The mold plate 22 may artificially express an embossing effect or a wood texture by adding irregularities of a certain shape to the mold plate according to the consumer's taste.

Since the mixed coating agent used in the present invention is a thermosetting resin system, pressurizing under the above press conditions causes the melamine sheet and the coated coating agent to cure to the finished product, while curing the coated coating material on the surface of the product. Form (23).

Hereinafter, the present invention will be described in detail with reference to the following examples, but the protection scope of the present invention is not limited only to the following examples.

Example 1

Prepare the finished products (11, 12a) with natural veneer adhered to the upper side of plywood or wood based plate material.

The coating agent 14 mixed with 90% by weight of the melamine liquid resin and 10% by weight of the butyl-vinyl acetate liquid resin is stored in the coating reservoir 13 attached to the rollers 15a, 15b, 15c, and 15d.

The melamine sheet 20 which ensured transparency is prepared.

When the preparation is complete, the finished products 11, 12a are applied while passing through the rollers 15a, 15b, 15c, 15d while adjusting the roller spacing so that the coating amount is applied in an amount of 50 g / m 2.

When the application process is completed (11, 12a, 16a) through the dryer 17, the semi-drying for 4 minutes at 120 ℃, the semi-drying is finished to ensure the transparency prepared on the upper side (11, 12a, 16b) The melamine sheet 20 is loaded and transferred to the presses 21a and 21b.

The transferred products 11, 12a, 16b, and 20 are loaded on the lower side 21b of the press and pressed under conditions of a temperature of 160 ° C., a pressure of 15 kg / cm 2 and a time of 1 minute to complete the surface hardening treatment (23).

Example 2

Prepare the finished products (11, 12a) with natural veneer adhered to the upper side of plywood or wood based plate material.

The coating agent 14 mixed with 90% by weight of the melamine liquid resin and 10% by weight of the epoxy liquid resin is stored in the coating reservoir 13 attached to the rollers 15a, 15b, 15c, and 15d.

The melamine sheet 20 which ensured transparency is prepared.

When the preparation is complete, the finished products 11, 12a are applied while passing through the rollers 15a, 15b, 15c, 15d while adjusting the roller spacing so that the coating amount is applied in an amount of 50 g / m 2.

When the application process is completed (11, 12a, 16a) through the dryer 17, the semi-drying for 1 minute 30 seconds at 160 ℃, the transparency prepared on the upper side of the finished product (11, 12a, 16b) The secured melamine sheet 20 is loaded and transferred to the presses 21a and 21b.

The conveyed products 11, 12a, 16b, and 20 are loaded on the lower side 21b of the press and pressed under conditions of a temperature of 120 ° C., a pressure of 17 kg / cm 2, and a time of 1 minute 30 seconds to complete the surface hardening treatment (23). .

Example 3

Prepare the finished products (11, 12a) with natural veneer adhered to the upper side of plywood or wood based plate material.

The coating agent 14 mixed with 90% by weight of the melamine liquid resin and 10% by weight of the urethane liquid resin is stored in the coating reservoir 13 attached to the rollers 15a, 15b, 15c, and 15d.

The melamine sheet 20 which ensured transparency is prepared.

When the preparation is complete, the finished products 11, 12a are applied while passing through the rollers 15a, 15b, 15c, 15d while adjusting the roller spacing so that the coating material is applied in an amount of 50 g / m 2.

When the coating process is finished (11, 12a, 16a) through the dryer 17, the semi-drying for 30 seconds at 200 ℃, and the transparency prepared on the upper side of the finished product (11, 12a, 16b) is ensured The melamine sheet 20 is loaded and transferred to the presses 21a and 21b.

The conveyed products 11, 12a, 16b, and 20 are loaded on the lower side 21b of the press and pressed under conditions of a temperature of 180 ° C., a pressure of 20 kg / cm 2 and a time of 20 seconds to complete the surface hardening treatment (23).

Example 4

Prepare the finished products (11, 12b) in which the wood veneer is adhered to the upper side of the plywood or wood based plate material.

The coating agent 14 mixed with 90% by weight of the melamine liquid resin and 10% by weight of the butyl-vinyl acetate liquid resin is stored in the coating reservoir 13 attached to the roller.

The melamine sheet 20 which ensured transparency is prepared.

When ready, the finished product is applied through rollers (15a, 15b, 15c, 15d) while adjusting the roller spacing so that the coating is applied in an amount of 150 g / m 2.

When the coating process is completed (11, 12b, 16a) through a dryer and dried for half at 130 ℃ for 5 minutes, and the semi-drying finished product (11, 12b, 16b) the transparency of the prepared melamine sheet ( 20) is loaded and transferred to the presses 21a and 21b.

The conveyed products 11, 12b, 16b, and 20 are loaded on the lower side 21a of the press, and pressed under conditions of a temperature of 150 ° C., a pressure of 14 kg / cm 2 and a time of 1 minute to complete the surface hardening treatment (23).

Example 5

Prepare the finished products (11, 12b) in which the wood veneer is adhered to the upper side of the plywood or wood based plate material.

The coating agent 14 mixed with 90% by weight of the melamine liquid resin and 10% by weight of the epoxy liquid resin is stored in the coating reservoir 13 attached to the rollers 15a, 15b, 15c, and 15d.

The melamine sheet 20 which ensured transparency is prepared.

When ready, the finished product is applied through rollers 15a, 15b, 15c, 15d, with adjusting the roller spacing so that the coating is applied in an amount of 150 g / m 2.

When the application process is completed (11, 12b, 16a) through the dryer 17 and the semi-drying for 3 minutes at 150 ℃, the semi-drying is finished to ensure the transparency prepared on the upper side (11, 12b, 16b) The melamine sheet 20 is loaded and transferred to the presses 21a and 21b.

The transferred products 11, 12b, 16b, and 20 are loaded on the lower side 21b of the press and pressed under conditions of a temperature of 160 ° C., a pressure of 15 kg / cm 2 and a time of 40 seconds to complete the surface hardening treatment (23).

Example 6

Prepare the finished products (11, 12b) in which the wood veneer is adhered to the upper side of the plywood or wood based plate material.

The coating agent 14 mixed with 90% by weight of the melamine liquid resin and 10% by weight of the urethane liquid resin is stored in the coating reservoir 13 attached to the rollers 15a, 15b, 15c, and 15d.

The melamine sheet 20 which ensured transparency is prepared.

When the preparation is completed, the finished products 11 and 12b are applied while passing through the rollers 15a, 15b, 15c, and 15d while adjusting the roller spacing so that a coating amount of 150 g / m 2 is applied.

When the coating process is completed (11, 12b, 16a), the dryer 17 is passed through and dried for half a minute at 180 ° C., and transparency prepared on the upper side of the finished product (11, 12b, 16b) is ensured. The melamine sheet 20 is loaded and transferred to the presses 21a and 21b.

The transferred products 11, 12b, 16b, and 20 are loaded on the lower side 21b of the press and pressed under conditions of a temperature of 100 ° C., a pressure of 18 kg / cm 2 and a time of 3 minutes to complete the surface hardening treatment (23).

A product (Example) subjected to a surface strengthening treatment on the wood product of the present invention thus prepared was surface treated by impregnating with a product (Comparative Example 1) and melamine surface treated by a conventional UV urethane coating method (Comparative Example 2 Comparing the surface properties of) is shown in Table 1 below.

At this time, the surface strength of each product was cut to a certain size according to the method of measuring the surface strength of conventional wood products, and the wear resistance at room temperature was measured based on KS standard, and the scratch resistance was measured in 0.5N units by diamond needle method. In case of impact resistance, free fall of 10cm unit was performed by using the weight of 225g and the surface damage was visually determined. The cracking resistance was visually determined by using the magnifying glass used for jewelry evaluation.

* [Table 1]

1 is a view showing a step of applying a semi-dry coating and a mixed coating on the top of the finished product of the method for surface hardening of the wood product of the present invention

2 is a surface hardening process by loading a melamine sheet secured transparency on the upper part of the finished product of Figure 1 of the wood product treatment method of the present invention.

** Description of the symbols for the main parts of the drawings **

11: plywood or wood plate

12a: Natural veneer 12b: Solid wood veneer

13: coating reservoir 14: mixed coating

15a, 15b, 15c, 15d: roller

16a: coated surface 16b: dried surface

17: dryer

18: hot air heater or heating heater 19: conveyor

20: melamine sheet

21a: upper press 21b: lower press

22: Mold plate 23: Surface-hardened wood product

Claims (5)

In the method of reinforcing the surface of the wood products, the natural veneer or wood veneer is decorated on the upper side of the plywood or wood-based plate material, 80% to 99% by weight of the melamine liquid resin, the butyl acrylate-vinyl acetate liquid resin, vinyl acetate liquid resin, or urethane liquid resin or epoxy liquid resin in the ratio of 1% by weight to 20% by weight A method of reinforcing the surface of a wood product comprising mixing and manufacturing (14), and applying while passing through rollers (15a, 15b, 15c, 15d), drying, and pressing. The mixed coating agent of 30g / m <2> or more 80g / m <2> when the surface is natural veneer 12a (processing the wood thinly below thickness 1.0mm) among the finished products 11, 12a, and 12b of Claim 1. A method of strengthening the surface of a wood product, comprising applying, drying, and pressing while passing through rollers (15a, 15b, 15c, 15d). 80 g of the mixed coating agent according to claim 1, in the case where the surface of the finished products 11, 12a, 12b is a solid wood veneer 12b (wood is processed thicker than natural veneer with a thickness of more than 1.0 mm and 5.0 mm or less). A method of reinforcing the surface of a wood product comprising applying, drying and pressurizing while passing through the rollers (15a, 15b, 15c, 15d) at least 200 g / m 2 / m 2. The hot air or heater 18 capable of adjusting the height, the day and the calorific value while transferring the finished products having finished application (11, 12a, 12b, 16a) to the speed control conveyor 19 according to claim 1 Method of strengthening the surface of the wood product, characterized in that it comprises a semi-drying and pressurization in a dryer (17) that can be applied to the temperature conditions of 80 ℃ to 250 ℃ using. The melamine sheet 20 secured in transparency is loaded on the upper side of the finished product in which the semi-drying is finished (11, 12a, 12b, 16b), and the bottom surface 21b of the presses 21a, 21b. Presses 21a and 21b having a mold plate 22 attached to the upper side 21a on which a constant temperature (100 ° C or more and 200 ° C or less) and pressure (7kg / cm2 or more and 35kg / cm2 or less) can be maintained after being placed on the plate. Method for producing a surface-reinforced product of wood products, including the step of strengthening the surface of the wood products by pressing the time of about 4 seconds to 3 minutes).

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