JP2003313503A - Coating composition for butt end of planar material and method for coating the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a coating agent for finishing a butt end face having unevennesses smooth and to provide a coating means. <P>SOLUTION: The coating composition for the butt end face of a planar material has (1) ≤1.2 ratio (fluidization ratio) of a spread diameter (mm) of the coating composition on a plate surface after 1 min and 3 min when 100 mL of the coating composition is collected in a cylindrical container and emptied onto the plate having the smooth surface and ≤200 nm spread diameter after 3 min and (2) ≤1.0% water absorption coefficient of the coated film. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of coating a wood-like board, an inorganic board, an organic / inorganic foam, a plastic, a composite board with a metal or the like on the mouth end surface of a plate-like material.

[0002]

2. Description of the Related Art The surface of a plate-like material such as a wood board, an inorganic board, an organic / inorganic foam and a plastic, a composite board with a metal has various irregularities, wormholes, cracks and the like caused by raw materials and manufacturing processes. There are many defects, and the appearance of the product is not good as it is, and it often causes problems during secondary processing such as finish coating and overlay. Therefore, in order to repair the defective portion on the surface of the plate-like material and improve its surface property, a method of applying various paints has been adopted. However, it is no exaggeration to say that these coatings are strictly limited to the surface of the plate-like object, and the side surface thereof, that is, the surface of the wood, has been made quiet in the past. In the case of a wooden plate-like object such as plywood, even if the surface of the plate-like object is painted, the coating film on the surface cannot follow the contraction / expansion of the plate-like object itself due to changes in temperature and humidity, and the coating film cannot be synchronized. In the case of being tough and highly flexible, the plate-shaped material may push up the coating film to cause eye-lifting, and conversely, when the coating film is fragile, the coating film may be cracked and cracks may occur.

Therefore, in plywood and the like, moisture and humidity gradually infiltrate through the exposed wood mouth and swell, often impairing the commercial value. In addition, since the wood mouth is exposed, an inorganic plate such as a gypsum board is often weakened from the edge and is damaged, or glaring is generated on the coated surface. In the case of a single laminated plate (LVL) or rock wool plate, there is a problem that the appearance is inferior because defects such as irregularities on the surface of the wood remain. On the other hand, recently, a method of taping the wood surface has been proposed, but it has drawbacks such as complicated work, high equipment cost and high material cost, and a uniform tape on uneven plate-like material. It is a difficult technique to attach such a sticker, and the fact is that the repair effect is not sufficient. Since surface processing such as surface coating is usually performed mainly on the plate-shaped object, most of the coating or processing equipment sends the plate-shaped object to the coating apparatus with the front surface or the back surface as the upper surface. It has a structure. Therefore, the wood surface to be applied in the present invention is usually an upright surface. There is a need for a coating agent and a coating method that can be coated evenly on the wood surface in such a state.

[0004]

DISCLOSURE OF THE INVENTION An object of the present invention is to provide a paint for a mouthpiece and a coating method thereof for overcoming the above-mentioned problems relating to the mouthpiece surface of a board and producing a board of excellent quality. It is intended to be provided.

[0005]

[Means for Solving the Problems] To this end, the present inventors have diligently studied and as a result, by using a paint having a specific property, and further, a coating method capable of applying pressure to the wood mouth by applying the paint. The inventors have completed the present invention by discovering that the wood surface of a plate can be completely repaired and painted.

That is, the present invention relates to a coating composition for a mouthpiece of a plate-like product, which has a fluidization width of 200 mm or less and a fluidization ratio of 1.2 or less after 3 minutes in the slump test of the following (1). A coating composition for a mouth end of a plate-like product, wherein the coating film according to (2) has a water absorption rate of 1.0% or less. (1) Collect 100 ml of the liquid coating composition in a cylindrical container having an inner diameter of 50 mm, cover the opening surface of the container with a plate having a smooth surface such as a plastic plate and invert it, and immediately pull the container upward and pull it up. The spread diameter (mm) of the coating composition on the plate surface after 1 minute and 3 minutes was measured, and the value after 3 minutes was defined as the fluidization width, and after 1 minute and 3 minutes according to the following formula (I) The ratio of the diameter of is the fluidization rate. In the above, when the coating composition is a liquid at room temperature, it is measured in that state, and when the coating composition is a hot-melt type, it is heated and used as a completely liquid, and the cylindrical container and the plate are 40 ° C.
Measure using the one kept warm. Fluidization rate = Diameter after 3 minutes (mm) / Diameter after 1 minute (mm) (I) In this test, the cylindrical container should be made of a material from which the paint as the contents easily flows out. It may be made of plastic or metal. The coating composition is hot melt
In the case of the type, in order to measure the fluidization rate during heating,
Those made of metal are preferable. Similarly, the plate may be a glass plate, a metal plate such as stainless steel, as well as a plastic plate such as hard polyvinyl chloride or polyethylene.

(2) A coating composition (150 g / m ² ) is evenly applied to the surface of plywood such as a 30 cm square plywood for concrete formwork, and dried at 120 ° C. for 3 minutes. Inner diameter 6 in the center of the coated plywood
A transparent pipe made of, for example, acrylic resin having a length of 0 mm and a length of 150 mm is installed upright, the lower end of the pipe is completely sealed with plywood with an adhesive, and after curing at room temperature for 7 days, the weight of the plywood and the pipe is measured. Water is poured into the pipe to a height of 50 mm and left for 3 hours. Drain the water in the pipe and weigh the plywood and pipe. Calculate the water absorption rate by the following formula. Water absorption rate (%) = [(B−A) / A] × 100 (II) where A: weight before treatment (g) B: weight after treatment (g) The pipe in this test is completely coated with plywood. It can be used as long as it can be adhered in a sealed state and has no water absorption. In addition to the above pipe, for example, a glass pipe or the like can be used. In addition to the above characteristics, the present invention has a nonvolatile content of 50% or more when dried at 105 ° C for 3 hours, and when the coating composition is a liquid at room temperature, the viscosity at 23 ° C is 0.1 to 100 Pa.・ S
In the case of the hot-melt type, the coating composition for a mouth end of a plate-like material is characterized in that it has a viscosity of 0.1 to 100 Pa · S at a temperature at which it becomes completely liquid upon heating. Further, the present invention uses the above-mentioned coating composition as a coating agent when applying a coating agent using a coating device to the mouth end surface of a plate-like object which is continuously or intermittently conveyed by a feeder. This is a method for coating the mouth of a plate-shaped object.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION As the plate-like material in the present invention,
Plywood (coniferous plywood, hardwood plywood, composite board, concrete formwork plywood), particle board, hard board, MD
Wood board such as F, OSB, LVL, phenol foam,
Foam board materials such as urea foam, melamine foam, styrene foam, cement boards, calcium silicate boards, clay boards, magnesium boards, glass wool boards, inorganic boards such as rock wool boards, paperboard, wood wool boards, metal sizing boards, etc. Yes, these can be used after the surface is painted beforehand.

The coating composition of the present invention has a fluidization width,
Any fluidization rate and water absorption rate within the above range can be used, but specifically, epoxy resin, urethane resin,
There are formaldehyde resins such as acrylic resin, urea resin, melamine resin, and phenol resin. These may be either solution type or emulsion type. Furthermore, moisture-curable urethane resin coatings, EVA, BEP, polypropylene (PP), polyethylene, polystyrene,
A hot melt type coating agent made of polyurethane or the like can also be used. These may be used alone or in combination of two or more. Further, the coating composition of the present invention, commonly used in the field of coating, clay, talc, titanium, glass fibers, mica, inorganic substances such as calcium carbonate,
Organic substances such as wood flour and wheat flour may be blended as a filler. Furthermore, if necessary, a water repellent, a cross-linking agent, a coupling agent, a viscosity modifier, a pigment, an ultraviolet absorber, an antioxidant and the like may be added.

If the fluidized width in the slump test after 3 minutes is larger than 200 mm after 3 minutes, the coating composition drips immediately after coating, and uneven thickness occurs in the vertical direction after drying, and a uniform coating film cannot be obtained. . Further, if the water absorption rate of the coating film exceeds 1.0%, when applied to the wood mouth surface, moisture permeates from the wood mouth surface to the inside of the plate-like object through the paint film, which promotes the occurrence of eye float and cracks, which is not preferable. . If the fluidization rate is greater than 1.2, the coating agent will drip and a uniform coating film cannot be obtained. Further, the coating composition (coating agent) has a large elongation, and a hole is formed in the filling portion to be repaired on the surface of the mouth, so that stable waterproof performance cannot be obtained. On the other hand, when using hot-melt or moisture-curable urethane resin as the coating agent, the nonvolatile content after drying at 105 ° C for 3 hours is 50% or more, and it is heated to be completely liquid. Viscosity at 0.1 to 100 Pa
-It must be S. If it deviates from the range, dripping or scraping occurs frequently, and proper coating work cannot be performed.

The coating device for coating the coating agent comprises a feeding device for feeding a plate-like object to be coated to the coating section, a member for supplying the coating agent, and a coating agent for coating the coating agent. And a member for applying a pressure by sliding the applied coating film surface, which is added as necessary. As the plate-like material feeding device, those commonly used in this field can be used, and examples thereof include a roller conveyor, an endless belt, and a feeding roll.
A member for applying the coating agent supplied from the coating agent supply member (coating member) in order to apply the coating agent to the wood surface of the plate-like object.
Is applied, and the applied coating agent is rubbed by a member that follows and pressurizes. In the present invention, the profile pressurization means that the tip of the coating member or the blade-shaped profile pressurizing member is pressed so that the tip portion of the coating member or the blade-like profile pressing member comes into contact with the surface of the object to be coated in an appropriate area. It means to press.
A reverse roll, a doctor roll, a doctor knife or the like is used as the profile pressing member.

As the coating agent supply member, when the coating agent (coating composition) is a liquid having a relatively low viscosity, a vat is used, but a high-viscosity, high solid content or a rapid curing type of two liquid mixture is used. In the case of the coating agent, a feeding member such as a fugo-shaped box, a cylinder pressure type injection machine, a mixin grouter, an extruder equipped with a static mixer, or the like is suitable. In the above, the fugo-shaped box is a box type in which the thickness is reduced so that it converges toward the tip, and has a narrow slit-shaped coating solution discharge port extending in the width direction at the tip, and the discharge port This is a coating material supply member having a tongue piece whose upper edge extends further forward. Since the coating liquid applied to the surface of the object to be coated from the slit-shaped discharge port can be slid by the tongue, it can serve as a pressing member as well as a coating member.

The member for applying the coating agent and the member for applying and pressing the coating agent have the following forms. When the coating agent has a relatively low viscosity, the coating roll and the reverse roll are arranged in the conveyance direction of the plate-shaped article in the above-mentioned order so as to contact the mouth surface of the plate-shaped article, and the coating roll is used for coating. The agent is applied, and the applied agent is applied by a reverse roll and pressed. The supply of the coating agent to the coating roll is performed by supplying the coating liquid (coating agent) in the vat arranged in the vicinity of the coating roll to the coating roll via a specially-shaped supply roll, or The coating liquid staying in the fugo-shaped box is discharged and supplied to the mouth end of the plate-shaped object or the coating roll surface. As the supply roll, an inclined bar type or a spiral roll having spiral grooves on its surface can be used. In addition, a system in which the coating liquid in the vat is pumped up by a supply assisting device having a spiral screw built in the cylinder may be used. In the above, instead of the reverse roll, a doctor knife-shaped metal plate or a plastic plate, or a fixed bar may be used to follow and pressurize the coating liquid.

In order to increase the amount of coating, a single or a plurality of rotatable blades or a concavo-convex gear type coating roll whose tip can be brought close to the wood mouth surface of the plate-like object may be used. A circulation type in which the coating agent is flowed from the vat onto the roll can also be used. When the coating agent is a fast-curing type with high viscosity, high solid content or two-liquid mixture, the member for applying the coating agent and the member for applying pressure to the coating agent are 1).
A knife-shaped or fugo-shaped shape having a thickness that converges toward the tip, 2) an extruder or a curtain coater is preferable.

Further, when the member for applying the coating agent and the member for applying and applying pressure to the coating agent are roll-shaped, the coating apparatus has a temperature adjusting function and the surface in contact with the mouth end surface of the plate-like object is opened and closed. It is also possible to use a structure that is housed in a box with a free guide plate lid. In this case, the doctor roll moves to the coating roll side when no plate-shaped object is sent, Further, it is possible to prevent the agent from drying, and further, the member for applying the coating agent and the member for pressing the coating agent are 1) a blade having a knife shape, and the blade and Installed in parallel and / or in parallel and vertically, 2) Installed in parallel to both knurls of a plate-like object, and cutting the coating liquid reservoir so that the coating agent contacts a piece of the knurled surface Those having an elliptical shape can also be used. At this time, if the cut is made over the entire surface, the coating agent does not converge and overflows. Therefore, it is necessary to suppress the cut at a predetermined position.

[0016]

EXAMPLES Examples of the present invention will be described below, but the present invention is not limited to these examples.

Examples and Comparative Examples As plate-like materials, plywood, softwood plywood (LVL), OSB
(Oriented strand board), fiber board (wood wool board), calcium silicate board (silica board), rock wool board, and foam concrete board (foam) were used.
A plate having a thickness (width of the mouth end) of 9 to 12 mm was used. The coating agents used are shown below. A: Melamine resin [ML-725 manufactured by Honen Corporation] Blend: ML-725 / ammonium chloride = 100/1 B: Water-based vinyl urethane resin [Main agent: IW-130 manufactured by Honen Corporation Crosslinking agent: (stock) ) Honen Corporation K-1600] Blend: IW-130 / K-1600 = 100/15 C: Moisture-curing urethane resin [Honen Corporation IW-310] D: Ethylene / vinyl acetate hot melt [( Honen Corporation HP-320] E: Benzylic ether type phenol resin hot melt [Honen Corporation PC-1F] F: Epoxy resin [Main agent: Honen Corporation HE-11X Crosslinking agent: ( HONEN CORPORATION ES-K0
1] Formulation: HE-11X / ES-K01 = 100/20 G: Acrylic sealer [AS-002 manufactured by Honen Corporation] H: Vinyl acetate resin emulsion [VW-621] manufactured by Honen Corporation I: Acrylic modified putty for hand repair [HTP-13 manufactured by Honen Corporation] J: Epoxy resin emulsion [Main agent: manufactured by Honen Corporation ES-005 Crosslinking agent: manufactured by Honen Corporation ES-K
01] Formulation: ES-005 / ES-K01 = 100/20

Tables 1 and 2 show the characteristics such as fluidization width and fluidization rate of each coating agent and the respective coating conditions. The results of the plate-like material after coating are also shown in Tables 1 and 2. However, the coating method and the means for applying pressure in each example were the methods and means described below with reference to the drawings. Examples 1, 2, 3 FIG. 1 Example 4 FIG. 5 Examples 5, 6 FIG. 6 (when the gear-shaped coating roll 122 is rotated in the same direction as the transport direction of the plate-shaped article 4, “no conforming pressure is applied”. Example 7 FIG. 8 Examples 8-11 FIG. 2 Comparative examples 1, 2 FIG. 1 Comparative examples 3, 4 FIG. 2 Comparative examples 5, 6 FIG. 5 (The tongue piece 113 of the figo box 111 is strong against a plate-like object. When no pressure is applied, “no follow-up pressure”) Comparative Examples 7 and 8

[0019]

[Table 1]

[0020]

[Table 2]

Some embodiments of the coating method of the present invention will be described below with reference to the drawings. In the following explanation,
Unless otherwise specified, the front and back surfaces are the top and bottom, and the mouth end surface is the side face.

FIG. 1 shows an example of a coating method in which the mouth end surface is coated with a roll and the reverse roll is used to apply pressure. Figure 1
A is a schematic side view and FIG. B is a plan view. In the figure, 1 is a coating roll as a member to be coated, 2 is a reverse roll for tracing and pressurizing the coating agent, and 3 is a spiral groove for supplying the coating agent to the coating roll. Coating agent supply roll, 4 is a plate-like material, 5 is a coating agent, 6 is a coating agent scraping member, 7 is a coating agent vat, and 8 is a semi-cylindrical body covering the outer periphery of the coating agent supply roll. Show. The liquid coating agent 5 in the vat 7 is moved vertically upward by the rotation of the coating agent supply roll 3 having a spiral groove on the roll surface, and transferred onto the surface of the coating roll 1. The coating liquid (coating agent) 5 transferred to the coating roll 1 is applied by the coating roll 1 to the mouth end surface 4 a of the plate-shaped material 4. The applied coating liquid 5a is pressed by the reverse roll 2 arranged on the downstream side of the coating roll 1 in the transport direction of the plate-like material 4, and the surface is finished smooth. The reverse roll 2 is not brought into contact with the plate-like object when only applying and not applying the following pressure. In the above description, the spiral grooved supply roll 3 covers the outer periphery except the contact surface with the coating roll 1 with a semi-cylindrical body 8 as necessary to make the rise of the coating liquid more reliable. You can

The coating liquid adhering to the reverse roll 2 is returned to the scraping vat 7 by a doctor knife-shaped scraping member 6. When using this coating apparatus, the coating agent 5 is preferably a solvent-type or emulsion-type liquid coating agent,
A hot melt type may be used as long as it can be made liquid. In the case of a hot melt type coating agent, it is preferable to use a type that can heat or heat the vat, the coating roll, and the like. The solvent-type or emulsion-type coating liquid in the vat is made into a uniform coating liquid by circulating the coating liquid in a separately provided coating liquid tank.

FIG. 2 is another example of a method for applying a liquid coating agent as in FIG. 1, in which both the coating roll 11 and the coating agent supply roll 31 are frusto-conical (basket type). Here is an example. 2A is an end view in the traveling direction of the plate-like object 4, FIG. 2B is a top view, and FIG. 2C is a schematic side view. Each roll surface is inclined so that the surface of the coating roll 11 abuts in parallel with the mouth end surface 4a. The coating liquid 5 in the vat 7 is picked up by the supply roll 31 and transferred to the coating roll 11 to be coated on the wood mouth surface 4 a. Although the number of rolls is two in the figure, the coating roll 11 may be directly dipped in the coating liquid 5 in the vat 7 by a method of increasing the diameter of the coating roll 11 and removing the supply roll 31. Well, coating roll 11 and supply roll 3
Coating liquid adjusting roll (squeezing roll) of the same shape between 1 and
May be provided. When only the coating roll 11 is used, the plate-like material 4 may be tilted to apply the wood mouth surface 4a so as to correspond to the tilt of the surface of the coating roll 11, if necessary. As the coating agent, as in the case of FIG. 1, any of solvent type, emulsion type and hot melt type can be used. The roll may be a cone type or a wagon type, and in order to increase the coating amount,
A bevel gear (bevel gear) type may be used in which either or both of the coating roll and the supply roll have concavo-convex roll surfaces. The coating liquid 5a applied to the wood surface 4a is finished to a smooth surface by the tracing pressure member 21. The pressing member may be either a roll or a doctor knife-shaped plate.

3 and 4 are schematic views showing a coating method using a two-liquid mixed type coating agent, and FIG. 3 shows a mixing and discharging device,
FIG. 4 shows a coating state. As the mixing / discharging device 101, a device having a mixing / extruding screw such as an extruder is used. For example, the main agent A and the curing agent B are supplied to the device 101, mixed and extruded. Although various methods of discharging the mixed coating agent 5 are conceivable, in FIG. 4, a large number of discharging nozzles 103 are provided at the tip of the discharging head 102, and the coating liquid 5 is extruded from the nozzles 103 to the wood mouth surface 4a. And apply. The applied coating liquid is pressed by a pressure applying member, which is the same as in the case of FIGS. 1 and 2, to homogenize the applied surface. The mixing / discharging device may be one in which the main agent and the curing agent are supplied by an injector and mixed by a static mixer. The discharge nozzle may be a narrow slit having a length corresponding to the width of the wood mouth surface to be coated.

FIG. 5 shows a slit-shaped discharge nozzle (discharge port).
It is a figure which shows an example of the method of apply | coating the coating agent 5 discharge-applied from from with the application member which is called a fugo-shaped box in this specification which follows and pressurizes with the tongue of the upper edge of a discharge port. Fungo Box 11
Numeral 1 is a width slightly larger than the width (plate thickness) of the wood mouth surface, and has a coating liquid discharge port 112 at the tip as shown in the drawing, and further for pressurizing in a form where the upper edge of the discharge port extends at the tip. Of the tongue piece 113. The discharge port 112 is slightly narrower than the width of the wood port, and is normally a narrow opening, but the coating liquid is a tongue piece.
Since it is smoothed by 113, small holes may be provided continuously. In the fungo-shaped box 111, the coating agent 5 is supplied from the coating agent supply port 114 at the rear part thereof, discharged from the discharge port 112, applied to the wood mouth surface 4a, and pressed by the tongue piece 113. Fungo Box 1
The coating agent 5 may be supplied to the tank 11 from a tank T or the like by using a pump P or the like and a pressure resistant hose 115 or the like. By changing the angle at which the fungo-shaped box 111 is in contact with the wood mouth surface 4a, the pressure applied by the tongue 113 at the tip can be changed. It can also be in a non-existent state.

FIGS. 6 and 7 show an example of a method for applying a liquid coating agent having a slightly high viscosity. FIG. 6 is a plan view and FIG. 7 is a schematic cross-sectional view. As shown in the drawing, the gear-shaped coating roll 122 is arranged so that the uneven surface hits the mouth end surface 4a, and the side end on the mouth end surface side is opened. Placed in the coating liquid container 123,
1 shows a coating device 121 in which a movable wall 124, which is a part of a side wall of a container 123, can be adjusted in amount by increasing or decreasing the volume of the container 123 by a piston 125. The method of supplying the coating agent 5 to the coating device 121 is not particularly limited, but in this example, the device 12 is supplied from the tank T according to the coating amount.
The structure is such that it flows down into 1 and is supplied. The coating roll 122 may be rotated (forward rotation) in the same direction as the transport direction of the plate-shaped material 4, or may be rotated in the reverse direction to operate so as to slide the coating liquid applied to the wood mouth surface 4a. Is also good. In this way, the application roll 122 can be normally rotated to apply without pressure, and the reverse rotation can be applied with pressure.

FIGS. 8 and 9 are modified examples of FIGS. 6 and 7, wherein a coating tool 130 having a rotating shaft 131 and a plurality of gourd-shaped coating blades 132 is used instead of the gear-shaped coating roll. Is an example using. The applicator 130 is rotated by the application liquid container 133 having an open side end on the side of the mouth end to apply the application liquid. Smearing tool 1
30 is rotated in the forward or reverse direction to cause the same action as the coating roll 122. In the figure, 134 is an adjusting plate for adjusting the position of the plate-like object 4, 135 is a pressurizing plate for leveling the applied coating liquid, each of which is operated by a piston 126.
The method for supplying the coating agent 5 to the coating liquid container 133 is not particularly limited, but in this example, the structure is such that it is supplied by being dropped from the tank T into the coating liquid container 133 at any time according to the coating amount. There is. Further, the temperature of the tank T can be adjusted.

FIG. 10 shows another example of a method for applying pressure by applying the coating liquid. In the figure, reference numeral 141 indicates a contoured pressure plate for the surface 4a, 142 a pressure plate for the front surface of the plate-like object 4, and 143 a pressure plate for the back surface. As shown in FIG. 11 (a), when the coating liquid 5 applied to the grain surface 4 a is pressed by the tracing pressure plate 141, the coating liquid 5 may come out to both the front and back sides of the plate-shaped object 4. . If the coating liquid squeezed out on both the front and back surfaces of the plate-shaped material 4 is left as it is, there is a problem that the coating films on the front and back surfaces do not become smooth. Therefore, it is advisable to press the squeezed coating liquid over the front and back surfaces. When the viscosity of the coating liquid is low, it only hangs down below the surface of the wood.
It is also possible to use only the pressure plate 143 that conforms to the back side (FIG. 11).
(See (b)). When the viscosity of the coating liquid is slightly high, the plate-like material 4 protrudes on both the front and back sides, so that the pressing plates 142 and 143 on the front and back sides are used together (see FIG. 11C).
In the case of this example, a doctor knife-shaped thin steel plate may be used as the tracing pressure plate, but it is difficult to align the positions of the pressure plates with each other, so that as shown in FIG. It is preferable that each of the pressure plates on the front surface and the back surface is a thick plate body having a curved surface that gradually approaches from the entrance direction of the plate-like object 4 toward the plate-like object surface so as to contact the plate-like object surface.
Profile pressure plates 141, 142, 143 made of thick plates
Are arranged as shown in FIGS. 10A and 10B, so that the coating liquid 5 is applied to the side end portion of the plate-like object 4 as shown in FIG. 11C.

12 and 13 are modified examples of the above-mentioned FIG.
This is a method of using as the follower pressure plate 150, a plate body having a thick coating, which is provided with the coating liquid reservoir 151 on the side surface thereof, that is, on the side surface contacting the wood mouth surface 4a. The coating liquid pool 151 is provided with a curved surface similar to the curved surface provided on the tracing pressure plate of FIG. 10, so that the applied coating fluid is pressured. The coating liquid is supplied to the coating liquid reservoir 151 by an appropriate means according to the coating amount. Profiled pressure plate 150 of this example
May have a shape in which the cross section in the same direction as the width direction of the plate-like object 4 is also in contact with the back surface of the plate-like object 4, such as a “” shape. In this case, the plate-like object 4 may be sent by, for example, the sending roll 9. Further, the coating liquid reservoir 151 may be opened on the upper side, but if a lid is provided on the upper side, it is possible to improve the filling of the conduit and the defective portion by pressure coating.

According to the present invention, the viscosity and the fluidity of the coating agent are set to values within a predetermined range as described above, so that the smoothness, waterproofness, and weather resistance can be obtained even on the wood mouth surface in a substantially vertical state. A coated surface having excellent properties can be obtained. Further, by using the coating method and coating means shown in the present invention, a good coated surface can be easily formed.

[Brief description of drawings]

FIG. 1 is a side view and a cross-sectional schematic view showing an embodiment of a coating method in which a wood mouth surface of the present invention is coated with a roll and pressed.

FIG. 2 is a schematic view showing an example of the umbrella-roller type roll coating method of the present invention.

FIG. 3 is a schematic sectional view showing an example of an extrusion coating machine.

FIG. 4 is a schematic diagram showing an example of a coating method using an extrusion coating machine.

FIG. 5 is a schematic view showing an example of a coating method using a funnel-shaped box.

FIG. 6 is a schematic view showing an example of a coating method using a gear-shaped roll.

FIG. 7 is a schematic cross-sectional view showing a coating method using a gear-shaped roll.

FIG. 8 is a schematic view showing an example of a coating method using a gourd-type coating blade.

FIG. 9 is a schematic sectional view showing a coating method using a gourd-type coating blade.

FIG. 10 is a schematic view showing an example of a method for applying pressure by applying a coating liquid.

FIG. 11 is a schematic cross-sectional view showing an example of a method of applying pressure by tracing a coating liquid.

FIG. 12 is a schematic cross-sectional view showing an example of a method for applying a coating liquid reservoir and a method for applying pressure with a pressure plate.

FIG. 13 is a schematic view showing an example of a method for applying a coating liquid pool.

[Explanation of symbols]

1 coating roll 2 Reverse roll for tracing pressure 3 Coating agent supply roll 4 Plates 4a Plate-shaped material 5 Coating agent 6 Coating agent scraping member 7 Bat 11 Coat roll 31 Coating agent supply roll 111 Figo Box

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Yasushi Tashiro             1-2-3 Otemachi, Chiyoda-ku, Tokyo             In ceremony company Honen Corporation F-term (reference) 4D075 AC04 AC14 AC22 AC53 AC84                       CA47 DA34 DB21 EB60                 4J038 CB021 CB081 CC021 CF021                       CG001 DA061 DA131 DA161                       DB001 DG001 KA08 MA14                       NA06 NA23 PC02 PC04 PC06                       PC08

Claims (13)

[Claims] 1. A coating composition for a wooden mouthpiece having a fluidized width of 200 m after 3 minutes according to the slump test of (1) below.
A coating composition for a mouthpiece of a plate-like material, characterized in that the coating film according to the following (2) has a water absorption of 1.0% or less and a fluidity of 1.2 or less. (1) Collect 100 ml of the liquid coating composition in a cylindrical container having an inner diameter of 50 mm, cover the opening surface of the container with a plate having a smooth surface such as a plastic plate and invert it, and immediately pull the container upward and pull it up. The spread diameter (mm) of the coating composition on the plate surface after 1 minute and 3 minutes was measured, and the value after 3 minutes was defined as the fluidization width, and after 1 minute and 3 minutes according to the following formula (I) The ratio of the diameter of is the fluidization rate. In the above, when the coating composition is a liquid at room temperature, it is measured in that state, and when the coating composition is a hot-melt type, it is heated and used as a completely liquid, and the cylindrical container and the plate are 40 ° C.
Measure using the one kept warm. Fluidization rate = diameter after 3 minutes (mm) / diameter after 1 minute (mm) (I) (2) A coating composition (150 g / m ² ) is evenly applied to the surface of a 30 cm square plywood board, and A coated plywood is prepared by drying at ℃ for 3 minutes, a transparent pipe with an inner diameter of 60 mm and a length of 150 mm is placed upright in the center of the coated plywood, and the lower end of the pipe is adhesively sealed to the coated plywood surface with an adhesive or the like. After curing at room temperature for 7 days, weigh the plywood with the pipe, then pour water into the pipe to a height of 50 mm and let stand for 3 hours, then discard the water in the pipe and attach the pipe. Weigh the plywood and use the formula (I
Obtain the water absorption rate according to I). Water absorption rate (%) = [(B−A) / A] × 100 (II) where A: weight before treatment (g) B: weight after treatment (g) 2. A nonvolatile content of 5 when dried at 105 ° C. for 3 hours.
If it is 0% or more and the coating composition is a liquid at room temperature, 2
Viscosity at 3 ° C. is 0.1 to 100 Pa · S, and in the case of hot-melt type, viscosity at a temperature at which it becomes completely liquid upon heating is 0.1 to 100 Pa · S. Coating composition. 3. When the coating agent is applied to the ostium surface of a plate-like object which is continuously or intermittently conveyed by a feeding device by using the coating apparatus, the coating agent has the following (1) A method for coating the mouth end of a plate-like article, characterized in that the fluidization width after 3 minutes by the slump test is 200 mm or less, the fluidization rate is 1.2 or less, and the water absorption rate of the coating film according to (2) below is 1.0% or less. . (1) Collect 100 ml of the liquid coating composition in a cylindrical container having an inner diameter of 50 mm, cover the opening surface of the container with a plate having a smooth surface such as a plastic plate and invert it, and immediately pull the container upward and pull it up. The spread diameter (mm) of the coating composition on the plate surface after 1 minute and 3 minutes was measured, and the value after 3 minutes was defined as the fluidization width, and after 1 minute and 3 minutes according to the following formula (I) The ratio of the diameter of is the fluidization rate. In the above, when the coating composition is a liquid at room temperature, it is measured in that state, and when the coating composition is a hot-melt type, it is heated and used as a completely liquid, and the cylindrical container and the plate are 40 ° C.
Measure using the one kept warm. Fluidization rate = diameter after 3 minutes (mm) / diameter after 1 minute (mm) (I) (2) A coating composition (150 g / m ² ) is evenly applied to the surface of a 30 cm square plywood board, and A coated plywood is prepared by drying at ℃ for 3 minutes, a transparent pipe with an inner diameter of 60 mm and a length of 150 mm is placed upright in the center of the coated plywood, and the lower end of the pipe is adhesively sealed to the coated plywood surface with an adhesive or the like. After curing at room temperature for 7 days, weigh the plywood with the pipe, then pour water into the pipe to a height of 50 mm and let stand for 3 hours, then discard the water in the pipe and attach the pipe. Weigh the plywood and use the formula (I
Obtain the water absorption rate according to I). Water absorption rate (%) = [(B−A) / A] × 100 (II) where A: weight before treatment (g) B: weight after treatment (g) 4. The coating device has a coating agent supply member, a member for applying the coating agent, and a member for applying pressure to the coating agent, and the coating agent is vertically applied from the coating agent supply member. 4. The method for coating the mouth end of a plate-shaped article according to claim 3, wherein an auxiliary device for moving the coating material upward is attached to a member for applying the coating agent. 5. The coating agent supply member is an injector by cylinder pressure, and the member for applying the coating agent and the member for applying and pressing the coating agent have a knife-like or fugo-like shape with a convergent tip. The method for coating the mouth end of a plate-shaped article according to claim 3, characterized by having. 6. The method for coating the mouth end of a plate-like material according to claim 3, wherein the member for applying the coating agent and the member for applying the pressure of the coating agent are extruders or curtain coaters. 7. The method for coating the mouth end of a plate-like article according to claim 3 or 4, wherein the member for applying the coating agent is in a roll shape. 8. The member for applying the coating agent is in a roll shape, the member for applying and pressing the coating agent is in a plate shape or a roll shape, and the coating device has a temperature adjusting function. The method for coating the mouth of a plate-shaped article according to claim 7. 9. A member for applying a coating agent and a member for applying a pressure to the coating agent are blades having a knife shape, and the blades are parallel to the mouth end surface of the plate-like material and / or.
Alternatively, the method for coating the mouth end of a plate-shaped article according to claim 3, wherein the plate-shaped articles are installed in parallel and at right angles. 10. A member for applying a coating agent and a member for applying a pressure to the coating agent are installed in parallel with the both mouth faces of the plate-like material, and the coating liquid is applied so as to contact the mouth face. 4. The method for coating the mouth end of a plate-like object according to claim 3, wherein the method has a reservoir with a liquid. 11. A member for applying a coating agent and a member for applying a pressure to the coating agent are single or a plurality of rotatable blades whose tip can be brought close to the mouth surface of the plate-like material. The method for coating the mouth of a plate-like object according to claim 3. 12. A coating device for applying a coating agent and a member for tracing a pressure of the coating agent, each of which is a gear type, and has a supply device for enabling the first-in first-out of the coating agent. How to paint the mouth of a plate. 13. An auxiliary device that has a member for applying a coating agent and a member for tracing and pressing the coating agent, and an auxiliary device for vertically moving the coating agent is 1) a conical roll shape, or 2) a bevel gear, Gears and / or rolls having a worm gear structure, characterized in that they are used alone or in combination of two or more kinds, and the coating liquid is moved in the vertical direction to apply the coating agent to the surface of the mouth. The method for coating the mouth end of a plate-like object according to claim 1 or 2.