JP2009172547A - Surface coating method for woody composite flooring material - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a coating method for a woody composite flooring material capable of coating the surface of a woody composite flooring material obtained by sticking sliced veneer to laminated wood in a manner that touch and appearance same as those of a real single plate are given. <P>SOLUTION: The surface coating method for coating the surface of a woody composite flooring material A obtained by sticking a sliced veneer piece on a wood substrate comprises the steps of undercoating the sliced veneer piece stuck to the woody substrate, drying the coating film after the undercoating, pressing the surface of the coating film with a pressing roll P to make the coating film smooth on completion of the drying step, thereafter applying an intermediate coating and applying a top coat coating for finishing after forming the intermediate coating film. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a floor covering method. More specifically, the present invention relates to a method of painting a surface of a wood-based composite floor material obtained by sticking and integrating a veneer on a wood substrate such as plywood or MDF.

  In recent years, the depletion of timber resources has progressed, and it has become difficult to obtain solid timber, and its price is also rising. Therefore, wood-based composite flooring materials in which a veneer is attached to various wooden substrates such as plywood, laminated wood, medium density fiberboard (MDF), particle board, etc., and the surface is made popular are in widespread use. This wood-based composite flooring material is widely used not only for flooring materials but also for wall materials, ceiling materials and the like by changing the type of veneer as required.

  On the other hand, Japanese Patent Application Laid-Open No. 2007-105695 discloses a surface of a thick veneer, in particular, a solid veneer, and is not limited to the type of tree. Techniques for finishing flooring are disclosed. That is, in the above-mentioned Patent Document 1, undercoating is applied to the above wooden flooring, and after the surface of the undercoated wooden flooring is dried, it is rolled by a pressing roll, and the pressed undercoating film is further overcoated. And a method of painting a wooden floor material characterized by finishing.

In other words, solid veneer such as oak, cedar, cypress, pine, cusps, etc., or laminated wood that is an assembly of these wood chips, is used as a base material. It is colored to give a feeling of feeling and weight, and the coloring is made to have a desired color such as light brown, dark brown, black, etc. by a pigment or a dye. And it is not limited to the kind of trees, by applying a primer coat to a solid veneer with a thickness of 5 to 10mm, and then applying it with an overcoat to finish the solid veneer with a heavy luxury It is described that the material can be finished.
JP 2007-105695 A

  By the way, the veneer is a thin plate having a grain pattern obtained by thinly slicing natural wood such as oak, cedar, cypress, pine, cusus, etc., with a thickness of about 0.2 to 1.0 mm. If the paint is applied as it is, bubbles and the like are generated in the coating film, resulting in poor painting, and sufficient ground treatment is required. Therefore, in order to perform smooth surface coating, it is necessary to perform time-consuming pretreatment such as sealing and polishing in order to eliminate fluff and roughness.

  The present invention has been made in view of the background art described above, and the object thereof is, for example, a woody material obtained by sticking and integrating the above-mentioned veneer to a fixed-size woody substrate such as a plywood by means such as adhesion. It is an object of the present invention to provide a method for coating a wood-based composite flooring that allows the surface of the composite flooring to be coated so as to have the same touch and appearance as a solid single plate.

  In order to solve the above-mentioned problem, the method for painting a wood-based composite flooring according to the first aspect of the present invention provides a surface of a wood-based composite flooring formed by sticking a veneer on a wood base. A method of painting, in which a veneer is applied to a veneer stuck on the above-mentioned wooden substrate, and after the undercoating, the coating film is dried, and after the drying process is completed, the surface of the coating film is applied with a pressing roll. It is characterized in that it is pressed and smoothed, followed by intermediate coating, and after forming an intermediate coating film, it is finished by applying a top coating.

  As the above-mentioned wood substrate, various standard wood-based substrates such as plywood, laminated material, medium density fiberboard (MDF), particle board and the like are used. As the veneer, a natural veneer veneer with a beautiful grain pattern obtained by slicing to a thickness of about 0.2 to 1.0 mm is used. The veneer is attached to a wooden substrate, for example, a plywood, using an adhesive, and the surface of the wooden composite flooring obtained by integrating is applied using the coating method according to the present invention.

  As the adhesive, a synthetic resin such as vinyl acetate resin, urea resin, melamine resin, phenol resin, acrylic resin, polyester resin, polyurethane resin, isocyanate, SBR, NBR, or rubber-based adhesive is preferably used.

  According to a second aspect of the present invention, there is provided a method for painting a wood-based composite flooring, wherein, in addition to the invention according to the first aspect, undercoating is performed using a coloring liquid as the undercoating paint. As the coloring liquid, a stain paint, that is, a dye-based aqueous stain, an oil-based stain, an alcohol stain, a pigment-based aqueous stain, an oil-based stain, an alcohol stain, or the like is usually used. These are arbitrarily selected, but aqueous stains that do not emit harmful chemical substances are preferably used.

  The above-described coloring liquid is applied by rubbing against the veneer using a sponge roll. At this time, it is preferable to rotate the metal reverse roll in the direction opposite to the direction in which the wood-based composite flooring is conveyed by the belt conveyor so as to scrape excess coloring liquid.

  In addition to the invention described in claim 1, the method for coating a wood-based composite flooring according to claim 3 is characterized in that an iron roll is used as the pressing roll. As the iron roll, it is preferable to use an iron roll having a mirror-finished surface. Alternatively, the undercoated wood-based composite flooring may be sandwiched between an iron roll and a hard rubber roll and pressed with an iron roll.

  In addition to the invention described in claim 1, the method for coating a wood based composite flooring according to claim 4 is characterized in that a transparent paint is used as the top coat. Examples of the resin constituting the top coat paint include urethane resin, polyester resin, amino alkyd resin, and the like. Among them, it is preferable to use an ultraviolet curable clear or semi-clear transparent paint.

  In the method for coating a wood-based composite flooring according to the invention described in claim 1, in particular, a base coat is applied to a veneer stuck on a wooden base material, and after the base coat is applied, the coating film is dried and dried. After completion of the process, the surface of the coating film is pressed and smoothed by a pressing roll, so in the undercoating process, air entrained during coating, moisture remaining in the undried state, etc. are heated to the coating film. The generated bubbles are crushed and the surface of the undercoat coating is smoothed.

  The intermediate coating film can be formed by improving the adhesion between the undercoat coating film and the intermediate coating film by repeatedly applying the intermediate coating composition on the smoothed undercoat coating film. Furthermore, after the intermediate coating film is formed, the surface can be finished smoothly and with a good touch by applying a top coat and finishing.

  In the method for coating a wood-based composite flooring according to the invention described in claim 2, in particular, since a colored liquid is used as an undercoat paint, a large amount of the colored liquid is imprinted on a natural wood conduit portion on the surface of the veneer. Is emphasized, and the grain inherent to the veneer is further utilized to give a sense of quality and weight.

  In the method for coating a wood-based composite flooring according to the invention of claim 3, in particular, since the iron roll, preferably a mirror-finished iron roll, is used as the pressure roll, the veneer itself is fluffed. It is possible to effectively smooth the surface of the undercoating film by holding down or crushing bubbles generated in the undercoating process.

  In the method for coating a wood based composite flooring according to the invention described in claim 4, the surface can be finished smoothly and in a good-looking manner, particularly by performing a finish coating using a transparent coating as the top coating. . Moreover, even if tableware etc. are dropped, the coating film excellent in impact resistance in which the surface is hard to be damaged can be formed.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the present embodiment, a method for painting a surface of a wood-based composite flooring using a plywood as a wood substrate and having a veneer stuck thereon will be described.

  FIG. 1 is a process diagram showing a method for coating the surface of a wood-based composite flooring A according to the present invention. As shown in FIG. 1, first, undercoating is applied to the surface of the veneer of the above-described wood-based composite flooring A by an undercoating process 1. Next, after the undercoat coating film is dried in the drying step 2, the obtained coating film surface is pressed by a pressing roll in the pressing step 3. In this pressing process 3, the fluff of the veneer itself is suppressed, or in the undercoating process 1, air, moisture, etc. are heated to crush bubbles generated in the coating film, and the surface of the undercoating film is smoothed. Is done. The undercoat coating film that has been pressed as described above is further subjected to intermediate coating in the intermediate coating step 4, and finally is subjected to top coating in the top coating step 5 to obtain a product floor board.

  FIG. 2 is an explanatory view showing the undercoat coating process 1 shown in FIG. As shown in FIG. 2, the surface of the wood-based composite flooring A formed by sticking veneer b to plywood i is roll-coated with an undercoat paint supplied from a non-illustrated undercoat paint supply means and infiltrated into a sponge roll Sp. Is done. At this time, the surface of the wood-based composite flooring A already has a natural wood background due to the sticked veneer, but to make further use of the original grain and give a sense of quality and weight. Then, the veneer is coated with a colored stain paint as an undercoat.

  Here, roll coating is performed so that the colored stain paint is imprinted in the grain of the conduit hole on the surface of the veneer plate with the sponge roll Sp, and the remaining colored stain paint in the other portions is a metal reverse roll R. It is scraped off and returned to the non-illustrated undercoat paint supply means. By doing so, the outline of the wood grain pattern on the surface becomes clear, and an undercoat coating film in which the wood texture of the veneer is further emphasized is formed.

  Next, the wood composite flooring A to which the colored stain paint is applied is dried by removing moisture as a solvent in the drying step 2. As the drying means, for example, a jet dryer or an electric heater is used, and the drying is performed under conditions of a temperature of about 80 to 150 ° C. and a time of 30 seconds to 3 minutes.

After finishing the drying step 2, the wood-based composite flooring A coated with the undercoat is then pressed by an iron roll having a mirror-finished surface in the pressing step 3. The pressing pressure is ² to 10 kgf / cm ^2, and the pressure is appropriately adjusted depending on the type of the wood composite flooring A that is the article to be coated, the use of the flooring that is the final product, and the like. By crushing bubbles and the like generated in the undercoating film by this pressing process 3 and smoothing the surface, it prevents foaming in the next intermediate coating process 4 and forms a smooth intermediate coating film. Can be made.

  As the intermediate coating, the room temperature curable urethane coating, the heat curable melamine coating, the urea / melamine coating, the polyester coating, the acrylic coating, or the ultraviolet curable urethane coating, polyester. An intermediate paint such as a modified acrylic paint is used.

  On the intermediate coating film formed as described above, a finish coating is performed using a transparent coating as a top coating. As the transparent paint, acrylic resin paint, amino alkyd resin paint, vinyl resin paint, epoxy resin paint, polyurethane resin paint and the like are preferably used. Since the transparent paint is applied on the intermediate coating film to form a clear or semi-clear coating film, this coating film functions as a protective layer, and the surface is resistant to scratching even if dishes are dropped. A flooring excellent in impact can be obtained.

[Example]
FIG. 3 is an explanatory view schematically showing an embodiment of the surface coating method for the wood-based composite flooring A according to the present invention. In this example, a wood composite flooring A having 3 × 6 plywood affixed with oak veneer was used. Hereinafter, an example in which the surface is painted will be described with reference to FIG.

  First, in the undercoating process 1, a colored stain paint (W UN) made by Chinese paint as an undercoat paint was roll-coated with a sponge roll Sp. Excess colored stain paint other than the roll coating in the grain of the pipe hole on the surface of the veneer is scraped off by a metal reverse roll R, and the colored stain paint is supplied to the sponge roll Sp. Returned to supply means and reused.

Then, in the drying step 2, heating was performed at about 100 ° C. for about 60 seconds with a jet dryer, and water as a solvent was blown away, whereby an undercoat film C was formed on the surface of the wood-based composite flooring A. After that, it is conveyed to the pressing process 3 by a belt conveyor and pressed under pressure of ² to 10 kgf / cm ² with a pressing roll P having a mirror-finished surface to crush bubbles generated in the undercoat film c. The surface was smoothed.

  The wood-based composite flooring A having the above smooth undercoat paint film C is then transported to the intermediate coating step 4 and roll-coated with an intermediate coating (Polymedic SKS-610P) made by DIC by a sponge roll Sp. An intermediate coating film D was formed by irradiating ultraviolet rays for several seconds with an ultraviolet irradiation device.

  As mentioned above, the wood composite flooring A with the veneer b. The film was roll coated and irradiated with ultraviolet rays for several seconds with an ultraviolet irradiation device to form a top coat film e.

  The wood-based composite flooring A whose surface was coated by the above method was mirror-coated with a good appearance, was excellent in impact resistance, and was excellent in local load and wagon resistance with casters. In the above-described embodiment, the case where the intermediate coating and the top coating are performed once has been described. However, the coating may be repeated several times. Such overcoated forms also belong to the technical scope of the surface coating method for a wood-based composite flooring according to the present invention.

Process drawing which shows the surface coating method of the wood type composite flooring concerning this invention. Explanatory drawing which shows the undercoat coating process shown in FIG. Explanatory drawing which shows typically the Example of the surface coating method of the wood type composite flooring which concerns on this invention.

Explanation of symbols

A Wood based composite flooring Sp according to the present invention Sp Sponge roll R Reverse roll N Natural roll P Pressure roll 1 Undercoating process 2 Drying process 3 Pressure application process 4 Intermediate coating process 5 Top coating process i Plywood B Veneer c Undercoat Coating film D Middle coating film E Top coating film

Claims (4)

  A method of painting the surface of a wooden composite flooring by sticking a veneer on a wooden base material. The undercoat is applied to the veneer pasted on the above wooden base material. After drying the coating film, after the drying process is completed, the surface of the coating film is pressed and smoothed with a pressing roll, and then the intermediate coating is performed. After forming the intermediate coating film, the top coating is applied. Surface coating method for wood composite flooring to finish.   The surface coating method for a wood-based composite flooring according to claim 1, wherein undercoating is performed using a coloring liquid as the undercoating paint.   The surface coating method of the wood type composite flooring according to claim 1, wherein an iron roll is used as the pressing roll.   The surface coating method for a wood-based composite flooring according to claim 1, wherein a finish coating is performed using a transparent coating as the top coating.

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