JPH07256607A - Method and device for applying liquid - Google Patents

Abstract

PURPOSE:To provide an applicator capable of repairing a defective part, such as a wormhole, on a surface of a plate material and obtain a method thereof. CONSTITUTION:A device for applying coating liquid 3 on a surface of a plate material 1, that is transported continuously or intermittently to be coated, partially or all over comprises a coating amount control member, such as a knife coater or a squeeze roll 4, and an auxiliary pressurizing and loading member 2 having a restricting surface that restricts the flow direction of the coating liquid on the surface of the material to be coated and converges the coating liquid as the material to be coated is progressed. In this manner, the coating liquid is sufficiently pressurized and loaded in a crack, a wormhole, a conduit, and other defective parts formed on the surface of the material to be coated in a shape recessed therefrom. Therefore, a purpose of a repair or the like can be sufficiently accomplished by one process without conducting an inspection again.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for applying a coating liquid onto a plate-shaped article to be coated and a method for applying the liquid by the apparatus.

[0002]

2. Description of the Related Art It has been conventionally practiced to apply a coating liquid such as an adhesive or a paint to the surface of a plate-like material such as plywood or veneer. For these purposes, a roll spreader, a curtain flow coater, an air sprayer, etc. A coating device such as a knife coater is used.

[0003]

However, in order to repair a crack on the surface of a wood board such as plywood or veneer, an insect quill hole, or a defective portion of a shape recessed from the surface of a conduit or the like, such a conventional coating apparatus is used. Since it is for applying the coating liquid to the surface of the plate-like material with a uniform thickness, it is difficult to pressurize and fill the defective portion with the coating liquid accurately. The actual situation is that a lot of labor is required because it requires manual inspection and repair. The present invention solves these problems of the conventional device and provides a coating device with high repair efficiency. Another object of the present invention is to provide a coating method with good repair efficiency by the device.

[0004]

The present inventor has conducted extensive studies for this purpose, and as a result, by controlling the flow direction of the coating liquid and using a device for converging the coating liquid on the article to be coated. The inventors have found that the repair efficiency is improved and have completed the present invention. That is, the liquid application apparatus of the present invention is an apparatus for applying the application liquid to the entire surface or a part of the surface of the plate-like object to be continuously or intermittently conveyed, which comprises an application amount control member and an object to be applied. The present invention is characterized in that a pressure filling auxiliary member having a regulating surface for regulating the flow direction of the coating liquid on the object surface and converging the coating liquid as the material to be coated advances.

The pressure-filling auxiliary member is divided into two parts along the axis, for example, as a flow path of the coating liquid, that is, a regulating surface, and the divided surface is opened toward the surface of the object to be coated, and the large diameter side is defined as the coating liquid inflow side. Megaphone-shaped or frusto-conical, semi-conical, semi-circular, semi-triangular pyramid, semi-rectangular or pyramid, semi-cylindrical, etc., screw conveyor-like spiral convex parts on the roll surface Examples thereof include those in which the coating liquid is formed and those in the shape of a spatula, but are not limited thereto and may be those having a function of converging the coating liquid. The pressure-filling assisting member does not necessarily have to be provided at a right angle (90 ° angle) to the transport direction of the article to be coated, but can be provided at an appropriate angle. Especially in the latter case, it is preferable that the coating liquid is set in an angle range of 45 to 90 degrees, and if the angle is other than this, the effect of converging the coating liquid is low and not practical. In the case of the former pressure-filling assisting member, one or more appropriate number of regulating surfaces, such as semi-conical shapes, are provided in the width direction of the object to be coated.

As the coating amount control member, a coating member generally used in this kind of field such as a roll, a squeeze roll, or a knife coater can be used, and the position thereof is not particularly limited, but in the conveying direction of the article to be coated. On the other hand, if it is installed behind the pressure filling assisting member, that is, on the downstream side in the conveying direction of the object to be coated, coating and repairing will be more effective.

In the apparatus of the present invention, the coating liquid supplied onto the surface of the plate-shaped object to be coated moves to the pressure filling auxiliary member as the material to be coated moves and flows into the regulating surface of the pressure filling auxiliary member. . At this time, for example, when the regulation surface is a semi-conical shape, the coating liquid entering the pressurizing and filling auxiliary member from the large diameter side is in a compressed state, that is, a converged state because the tunnel of the regulation surface is gradually narrowed. The compressed portion of the coating liquid is pressure-filled into the defective concave portion of the surface of the object to be coated. The remaining coating liquid is usually applied by a coating amount regulating member provided behind the pressure filling auxiliary member.

From the above, the length of the regulating surface of the pressure-filling assisting member in the moving direction of the object to be coated is selected so that the coating liquid is in a converged state. For example, when the coating liquid has a low viscosity, the length can be shortened as a regulating surface having a shape that is rapidly reduced in diameter from the inlet side, and when the coating liquid has a high viscosity, the regulating surface having the opposite shape can be used. . Further, from the above, it is not necessary to dispose the pressurization filling auxiliary member in contact with the surface of the plate-shaped article to be coated, and an appropriate gap should be provided on the surface of the article to be coated within a range where the pressure filling / repair effect can be obtained. They may be provided separately from each other. Although this gap varies depending on the physical properties such as the viscosity of the coating liquid, it is preferable that the gap is set at a height of 20 mm or less from the surface of the object to be coated. If it is 0 mm, the object to be coated is likely to be scratched, and if it is 20 mm or more, the filling becomes defective.

Further, the coating apparatus of the present invention is characterized in that a coating liquid holding member for forming a coating liquid reservoir at an appropriate interval is provided between the pressure filling auxiliary member and the coating liquid holding member. By supplying the coating liquid between the pressure filling assisting member and the coating liquid holding member, it is possible to prevent the coating liquid passing through the pressure filling assisting member from rotating on the front surface of the auxiliary member and to prevent entrainment of entrained bubbles. To slow down the drying of the surface,
In addition to prolonging the pot life of the coating liquid, "first-in first-out" is possible in which coating liquids are supplied in order from the coating liquid supplied first, making it a quick-curing type coating liquid with a short curing time. Can also respond. As the coating liquid retaining member, a plate or the like to which the coating liquid is hard to adhere is preferably used. According to the coating apparatus of the present invention, various types of coating liquids such as organic solvent type, water-soluble type and emulsion type coating liquids are used for repairing defective portions of various plate bodies such as metal plates as well as wood plates. It can be applied efficiently, but is particularly suitable for applying an aqueous emulsion coating solution.

Furthermore, in the present invention, when a liquid is applied using the above-mentioned application device, an aqueous emulsion and / or an aqueous latex as a coating liquid, a cross-linking agent and a filler are essential constituent components, and the constituent components are preliminarily prepared. A method for applying a liquid, which comprises mixing and liquefying, wherein the crosslinking agent is (1) a polyfunctional aziridine compound having two or more aziridinyl groups in the molecule, and (2) an aqueous epoxy compound. , (3) It is preferable to use a coating liquid which is one kind or a combination of two or more kinds selected from the group of organosilicon compounds.

Conventionally, when a surface of a wooden board or the like is sealed and repaired by a knife coater or the like, an active hydrogen group-containing compound is used in order to completely fill in defective parts such as insect holes, cracks and conduits. A coating liquid combining an isocyanate compound and a volatile compound was used. As a result, the coating liquid filled in the defective portion was foamed, and a smooth finished surface could be obtained by the sanding treatment after curing (Japanese Patent Laid-Open No. Hei 3).
-136806, JP-A-3-267174). However, since such a foamable coating liquid cures too quickly and has a short pot life, it must be blended frequently at the work site, which is complicated. Therefore, it has been attempted to use a non-foaming type coating liquid with a long pot life, but after coating and curing, the coating liquid filled in the defective part will be messed (blown) and a smooth finished surface will be obtained. It raises a new problem of not being able to. Since the coating liquid of the present invention has a long pot life at room temperature, it can withstand long-term storage after preliminarily prepared, not to mention on-site premixing. On the other hand, when the coating liquid is applied by the coating apparatus according to the present invention, when the defective portion on the surface of the wooden board passes through the knife portion, the pressure is suspended by the converging action of the coating liquid. Can be completely filled.

To prepare the coating liquid of the present invention, 0.01 to 15 parts by weight, preferably 0.1 to 7 parts by weight of a crosslinking agent is added to 100 parts by weight of an aqueous emulsion and / or an aqueous latex as a main ingredient. , 100 to 300 parts by weight of the filler is blended. In addition to these constituent components, polyacrylic acid soda, polyvinyl alcohol, a viscosity imparting agent such as cellulose ether, a surfactant, a diluent, a defoaming agent, a dispersant, as a constituent component of an ordinary coating composition such as a pigment. There is no problem in adding what is used as needed.

The aqueous emulsion used in the present invention includes acrylic resin, acrylic acid-acrylic acid ester copolymer resin, acrylic-styrene copolymer resin, acrylic-ethylene-styrene copolymer resin, ethylene vinyl acetate resin, vinyl acetate. There are emulsions such as resins, aqueous urethane resin emulsions and dispersions, and as the aqueous latex, styrene butadiene latex,
There are carboxylated chloroprene rubber latex etc.,
These can be used alone or in combination of two or more.

The polyfunctional aziridine compound used as a curing agent in the present invention is a compound having two or more aziridinyl groups in the molecule, and examples thereof include trimethylolpropane tris [3- (1-aziridinyl). ) Propionate], trimethylolpropane tris [3- (1-aziridinyl) butyrate], trimethylolpropane tris [3- (1- (2-methyl) aziridinyl) propionate], trimethylolpropane tris [3- (1-aziridinyl) ) -2-Methylpropionate], pentaerythritol tris [3- (1-aziridinyl) propionate], pentaerythritol tetra [3- (1-aziridinyl) propionate],
Diphenylmethane-4,4'-bis-N, N'-ethylene urea, 2,4,6- (triethyleneimino) -Sy
Examples thereof include n-triazine and bis [1- (2-ethyl) azirinidyl] benzene-1,3-carboxylic acid amide, and these can be used alone or in combination of two or more.

The aqueous epoxy compound used in the present invention is an epoxy compound generally referred to as a glycidyl ether of a polyhydric alcohol such as ethylene glycol glycidyl ether, sorbitol polyglycidyl ether, trimethylolpropane polyglycidyl ether, and the like. One kind or a combination of two or more kinds can be used.

Organosilane compounds used in the present invention include γ-aminopropyltriethoxysilane and N-β.
(Aminoethyl) -γ-aminopropyltrimethoxysilane and other aminoalkylsilanes, γ-glycidoxypropyltrimethoxysilane, γ-glycidoxypropylmethyldimethoxysilane, γ-glycidoxypropylmethyldiethoxysilane, etc. Epoxy silane, γ-chloropropyltrimethoxysilane, γ-chloropropylmethyldichlorosilane and other chloro-based silanes, γ-methacryloxypropylmethyldimethoxysilane, γ-methacryloxypropyltrimethoxysilane, vinyltriethoxysilane, γ- Methacryloxypropyltrimethoxysilane, aminoepoxysilane and the like are available, and these can be used alone or in combination of two or more. These crosslinking agents are blended in an amount of 0.01 to 15 parts by weight, preferably 0.1 to 7 parts by weight, based on 100 parts by weight of the aqueous emulsion and / or the aqueous latex as the main component.

In the present invention, each of the above crosslinking agents is used alone or
By using one or more kinds in combination, it is possible to control the curing rate of the aqueous emulsion and / or the aqueous latex as the main component. Some fillers accelerate the curing of the aqueous emulsion and the aqueous latex depending on the type, and the influence of these can be adjusted by using the above-mentioned crosslinking agent.

As the filler used in the present invention, clay, talc, aluminum hydroxide, glass powder, clay,
Abrasive powder, silica, barium sulfate, mica, titanium oxide,
Inorganic substances such as iron oxide, white carbon, aluminum silicate, calcium carbonate, and magnesium carbonate, cellulosin, pulp, coconut shell powder, wheat flour, rapeseed meal, konjac flour, corn starch, potato starch, corn gluten, milk casein, egg white powder, soybean There are organic substances such as proteins, diatomaceous earth, bone meal, and the like, and these can be used alone or in combination of two or more, if necessary.

[0019]

EXAMPLES Examples of the present invention will be shown below, but the present invention is not limited to the gist of the present invention.

Example 1 Coating Apparatus Each example of the coating apparatus of the present invention will be described with reference to the drawings.
1 to 3 are schematic side views showing an arrangement state of the pressure filling auxiliary member 2 of the present invention, 1 is a plate-like object to be coated such as plywood and veneer, 3 is a coating liquid, and 4 is coating A squeeze roll 5 as a quantity regulating member indicates a knife coater. FIG. 1 shows an example in which only the pressure filling assisting member 2 is provided, and FIGS. 2 and 3 show an example of the coating apparatus of the present invention arranged together with the coating amount regulating member. The filling auxiliary members may be integrally installed. 2 and 3
In the drawing, the squeeze roll 4 and the knife coater 5 are shown in a state in which the coating liquid 3 is raised. The amount of this liquid pool adjusts the height of the pressure filling auxiliary member 2 provided on the plate-shaped article 1. Can be adjusted arbitrarily.

4 to 9 are views showing various shapes of the restricting surface 22 of the pressurizing and filling auxiliary member 2, (a) being a perspective view,
(B) is a plan view. FIG. 4 shows a regulation surface 22 having a half-megaphone shape, FIG. 5 has a semi-conical shape, FIG. 6 has a quasi-hemispherical shape, FIG. 7 has a triangular pyramid, FIG. 8 has a quadrangular pyramid, and FIG. 9 has a semi-cylindrical shape. A filling auxiliary member is shown. These are the control surface 22
The flow path has a diameter that gradually decreases from the inlet 21 to the inside. As shown in the drawing, these regulating surfaces are provided in a predetermined number in the width direction of the article to be coated. It should be noted that, as shown in FIG. 10, the pressurizing and filling auxiliary member 2 may be provided at a position separated from the surface of the article to be coated by an appropriate height h as necessary, so that the coating formed by the regulation surface 22 is applied. The liquid channel may have a shape in which the rear end is closed.

FIG. 11 shows an example in which the coating liquid retaining member 8 is provided. As shown in the figure, when the coating liquid holding member 8 is provided on the front surface of the pressure filling auxiliary member 2 and the necessary amount of the coating liquid 3 is supplied between them, the front surface of the pressure filling auxiliary member 2 is unnecessarily coated. The liquid 3 does not collect, bubbles do not mix in the coating liquid 3, and the supplied liquid is sequentially coated, and the coating liquid does not harden in the liquid pool.

FIG. 12 is a view showing still another example of the pressurizing and filling assisting member, wherein the roll 10 is provided with a ridge 11 in a spiral shape, and the ridge 11 forms a coating liquid regulating surface. In the case of this pressure-filling assisting member, the filling and repairing ability can be obtained by arranging the pressure-filling assisting member at an angle of 45 to 90 degrees with respect to the conveying direction of the article to be coated 1 according to the angle (or the number of windings) of the protrusion 11. Can be increased. 13 shows an example in which the pressure filling auxiliary member 2j is provided at an angle of 90 ° with respect to the conveyance direction of the article to be coated 1, and FIG. 14 is an example in which it is provided at an angle of 45 °. It is needless to say that the pressure-filling auxiliary member 2j is not limited to the pressure-filling auxiliary member 2j, and the pressure-filling auxiliary members 2a to 2f in FIGS. Further, the pressure filling assisting member 2a to 2f or the like detects a defective portion on the surface of the object to be coated with a sensor such as a photoelectric tube, and according to the detection result, the regulation surface is correctly aligned with the detected position of the defective portion. You may make it able to move left and right in the width direction of the article to be coated.

15 and 16 show another example of the pressure-filling assisting member. The pressure-filling assisting member 2k having a spatula-shaped regulating surface reciprocates in the width direction of the article 1. It is supposed to do. In the figure, 2k is a pressure filling auxiliary member,
Reference numeral 12 denotes a moving device that grips the pressure filling auxiliary member 2k and travels on the rail 13. FIG. 15 is an example in which the pressure filling auxiliary member 2k is moved in a direction perpendicular to the transport direction of the article 1 (width direction of the article), and FIG. 16 is 45 ° with respect to the transport direction. This is an example in which the angle is moved diagonally. In these drawings, the spatula-shaped regulating surface of the pressurizing and filling assisting member 2k is mounted on the moving device 12 at a right angle to the rail 13, but the present invention is not limited to this and may be provided at an appropriate angle. good. Similarly, the angle of the spatula-shaped regulating surface in contact with the surface of the object to be coated may be inclined, and the spatula-shaped pressure filling assisting member 2k is made of a suitable thin steel plate or plastic plate and It is preferable that the contact angle of is always an acute angle in the moving direction of the pressure filling auxiliary member 2k.

Although not shown in any of FIGS. 12 to 16, a coating amount regulating member such as a roll coater or a knife coater is provided on the downstream side of the pressurizing and filling auxiliary member, and is applied by a usual method. Alternatively, the present inventor has previously proposed a knife coater 5 as shown in FIG. 3 by pressing the back surface of the knife coater 5 with a pipe or a roll 6 connected to a pressurizing cylinder 7 to bring the tip of the knife into pressure contact with the surface of the article to be coated. Alternatively, it may be applied by a scanning pressure application method (Japanese Patent Application Laid-Open No. 3-1.
No. 36806).

The coating apparatus of the present invention has been described above. However, in the case of the pressure filling auxiliary member shown in FIGS. 4 to 9, it is possible to apply the coating liquid to the surface of the object to be coated using only the auxiliary member. In this case, the coating liquid may be handled by moving the pressurizing and filling auxiliary member without moving the object to be coated.

Example 2 Application of coating liquid 100 parts by weight of acrylic resin emulsion (manufactured by Showa Highpolymer Co., Ltd., Polysol AT-3: solid content 30%), vinyltrichlorosilane (manufactured by Toshiba Silicone Co., Ltd., TSL)
8303) 1.2 parts by weight, talc 200 parts by weight, clay 50 parts by weight, defoaming agent (silicone type) 0.3 parts by weight and dispersant (polycarboxylic acid type) 0.8 parts by weight are mixed,
A coating liquid was prepared. This coating liquid is applied using the coating apparatus of the present invention of the type shown in FIG. 3 equipped with the pressure filling assisting member shown in FIG.
The base plate was applied under the following conditions. Plywood 900 mm x 1800 mm x 2.5 mm (surface layer thickness is 0.65 mm) Coating amount 10 g / 900 cm ² Line speed 30 m / min Drying conditions Elfin type hot air circulation dryer Furnace temperature 60-85 ° C Drying time 7 minutes Drying, room temperature Upon observing the surface after returning it to, the coating liquid was completely filled even in the cracks and grooves, and it was a smooth and good finished surface without eye loss. Even when this coating solution was left at room temperature (about 12 to 20 ° C.) for 24 hours, the viscosity hardly increased.

[0028]

EFFECTS OF THE INVENTION The present invention uses a pressure-filling auxiliary member having a regulating surface where the coating liquid converges as the material to be coated progresses, so that cracks, wormholes, conduits, etc. on the surface of the material to be coated can be removed. Since the dented defective portion is filled with the coating liquid while being sufficiently pressurized, it is possible to achieve the purpose of repair or the like in a single operation without reinspection. INDUSTRIAL APPLICABILITY The coating apparatus of the present invention can be applied not only to the surface coating of wooden boards, but also to the coating of metals such as sintered metal plates and unglazed plates or inorganic porous plates. Further, in the present invention, the curing rate can be adjusted by adding a specific crosslinking agent to the aqueous emulsion or aqueous latex, and an arbitrary filler can be added, so that the viscosity and fluidity of the coating liquid can be maintained in a preferable state. You can
It is possible to perform coating and filling with good repair efficiency.

[Brief description of drawings]

FIG. 1 is a side view showing an arrangement state of a pressure filling auxiliary member.

FIG. 2 is a side view showing an embodiment of the present invention.

FIG. 3 is a side view showing another embodiment of the present invention.

FIG. 4 is a diagram showing an example of a pressure filling auxiliary member.

FIG. 5 is a diagram showing an example of a pressure filling auxiliary member.

FIG. 6 is a diagram showing an example of a pressure filling auxiliary member.

FIG. 7 is a diagram showing an example of a pressure filling auxiliary member.

FIG. 8 is a diagram showing an example of a pressure filling auxiliary member.

FIG. 9 is a diagram showing an example of a pressure filling auxiliary member.

FIG. 10 is a side view showing another embodiment of the present invention.

FIG. 11 is a side view showing still another embodiment of the present invention.

FIG. 12 is a perspective view showing another example of the pressure filling assisting member.

FIG. 13 is a plan view showing an example of an arrangement state of a pressure filling auxiliary member.

FIG. 14 is a plan view showing another example of the arrangement state of the pressure filling auxiliary member.

FIG. 15 is a perspective view showing still another example of the pressure filling assisting member.

FIG. 16 is a plan view showing an example of an arrangement state of a pressure filling auxiliary member.

[Explanation of symbols]

 1 coating object 2 pressure filling auxiliary member 3 coating liquid 4 squeeze roll 5 knife coater

Continuation of the front page (51) Int.Cl. ⁶ Identification number Reference number within the agency FI Technical display area B27D 5/00 B27M 1/00 Z 7369-2B

Claims (8)

[Claims] 1. A device for applying a coating liquid to the entire surface or a part of the surface of a plate-shaped article to be continuously or intermittently conveyed, which comprises a coating amount control member and a coating solution on the surface of the article to be coated. And a pressurizing and filling auxiliary member having a restriction surface for restricting the flow direction of the coating liquid and converging the coating liquid as the material to be coated progresses. 2. The liquid coating apparatus according to claim 1, which is a plate-shaped object such as a wood plate or an inorganic plate, and for the whole surface repair of a plate-shaped coated object having a defective portion such as a conduit or a crack on the surface. 3. The regulation surface is in the conveyance direction of the plate-shaped article to be coated,
2. A pressure filling auxiliary member for pressure-filling a defective portion on the surface of an object to be coated while converging the coating liquid by moving at an angle (45 to 90 degrees) close to a right angle. 2. The liquid coating apparatus according to 2. 4. The pressure-filling assisting member is provided on the surface of a plate-shaped article to be coated and is installed at a height of 20 mm or less from the article to be coated. The liquid coating apparatus described. 5. The liquid according to claim 1, further comprising a coating liquid holding member for forming a coating liquid reservoir at an appropriate interval between the pressure filling auxiliary member. Coating equipment. 6. A plate-shaped article for treating a coating liquid supplied to the surface thereof, the lower surface of which opens toward the surface of the article to be coated, and the front surface of which has a coating solution inlet port. A pressurizing and filling auxiliary member for a coating liquid, characterized in that at least one coating liquid flow path having a shape in which the diameter is gradually reduced toward the rear is provided. 7. When applying a liquid using the coating apparatus according to any one of claims 1 to 6, the coating liquid contains an aqueous emulsion and / or an aqueous latex, a crosslinking agent and a filler as essential constituent components, and A method for applying a liquid, characterized in that the components are mixed in advance to form a single liquid. 8. A cross-linking agent is (1) a polyfunctional aziridine compound having two or more aziridinyl groups in the molecule, (2).
The liquid coating method according to claim 7, which is one or a combination of two or more selected from the group of water-based epoxy compounds and (3) organosilicon compounds.