JP2009045538A - Coating apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a coating apparatus capable of quickly and efficiently applying various coating liquids including liquid wax for floors by a rotary coating roll using a cylindrical porous resin having continuous pores without effects of the unevenness of the object surface to be coated and also capable of drying the applied coating liquids at a high speed. <P>SOLUTION: The coating apparatus comprises a rotary coating roll composed of a hollow cylindrical axial core having a coating liquid injection port in one end and a plurality of coating liquid out-flow holes in the cylindrical wall and supported near both the ends by a roll choke in rotating manner and a cylindrical porous resin body attached to the outside face of the axial core and having continuous pores and is capable of rotating the rotary coating roll at a higher peripheral speed than the coating speed for a material to be coated. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a coating apparatus having a rotary coating roll made of a porous resin body having continuous pores, and in particular, various coating liquids including a floor wax liquid can be quickly and efficiently applied to a material to be coated. The coating liquid applied to the material to be coated can be applied uniformly without being affected by the unevenness of the surface, and the peripheral speed of the rotary coating roll is made faster than the speed driven by the contact with the material to be coated. An object of the present invention is to provide a coating apparatus capable of drying at high speed.

It has been widely practiced to apply coating liquids such as paint and floor wax to the inner and outer wall surfaces and floor surfaces of ordinary houses, buildings, fences, ships and the like. In addition to sheet-like applicators such as mop, such application liquids can be applied from vibration applicators, rotary applicators, brushes, brushes, rollers, etc. The most preferable applicator is selected and used in accordance with the shape of the object to be coated and the characteristics of the coating liquid to be used. Among them, the roller is widely used because it has less scattering of the paint, maintains a good working environment, and is excellent in coating efficiency.
For example, Japanese Patent Application Laid-Open No. 2007-50311 (Patent Document 1) states that “a roll body having a hollow cylindrical portion and an application member that applies paint to the surface of an object to be coated mounted on the outer periphery of the inner cylindrical portion of the roll body. And the application member is a porous body having continuous pores impregnated with the paint, and the cylindrical portion of the roll body has a number of supply holes constituting a supply path for supplying the paint from the inside to the application member A coating roll characterized in that is provided.

Japanese Patent Application Laid-Open No. 2004-351356 (Patent Document 2) states that “a plurality of coating rollers and a handle that rotatably supports the coating roller are formed on the hollow shaft core portion of the coating roller. A roller-type applicator that performs application work on the surface to be applied while impregnating the application liquid of the application roller by causing the application liquid to flow out from the shaft core portion through the outflow hole of the application roller, A sheet material having a mesh structure smaller than the impregnation flow path of the coating liquid in the coating section is interposed between the outer peripheral surface of the shaft core section and the coating section so as to cover the plurality of outflow holes. An attached roller applicator is disclosed.
Japanese Patent Application Laid-Open No. 2003-236430 (Patent Document 3) states that, “For a pressure-feed type roller coating machine, the roller shaft has a plurality of small holes arranged in the axial direction, and the coating roller is a complex cylindrical rotation. The body is composed of an outer cylinder element as a coating member and one or a plurality of inner cylinder elements as a coating liquid dispersion member, and both ends are liquid-sealed in a state of being mounted on a roller shaft, and at least the inner cylinder element It is assumed that a large number of coating liquid flow paths consisting of fine gaps or reticular tubes continuous in the radial direction of the cross section are formed, a flow rate fine adjustment valve is provided in the coating liquid flow path, and the coating liquid is pressed into the coating roller. Then, after the particles in the coating liquid are forcibly dispersed in the distribution process by the coating liquid distribution path of the coating roller, a pressure-feed type roller coating machine is disclosed in which the coating liquid is uniformly infiltrated into the application member. .
However, with a coating apparatus using these coating rolls, it is difficult to obtain a uniform finish at a high speed, and there is no excess or deficiency in the coating amount over the entire surface to be coated, and the unevenness of the surface to be coated is eliminated. However, it has not been easy to develop a coating apparatus that is not affected by this, and has not been provided so far.
JP 2007-50311 A JP 2004-351356 A JP 2003-236430 A

As the roller used in the roller type coating device, “a plurality of the polyvinyl acetal porous material having elasticity in a wet state and integrally formed on the outer peripheral surface of the substantially cylindrical roll body and the roll body” A sponge roller for cleaning the object to be cleaned by rotating the top of the protrusion to the object to be cleaned, wherein the protrusion extends from the outer peripheral surface of the roll body and tapers. A cleaning sponge roller having a protruding end portion having substantially the same cross-sectional shape from the tip of the protruding base portion to the top portion is disclosed in Japanese Patent Laid-Open No. 2000-246187 (Patent Document 4). ing.
In addition, the disclosure of a sponge roll made of a material such as polyvinyl alcohol or polyvinyl chloride is found in “Draining roll for printed circuit board, lead frame and the like and its forming method” in Japanese Patent Laid-Open No. 7-1610 (Patent Document 5). It is done.
However, these rollers are configured to adapt to the cleaning of specific articles and the absorption of moisture, and are intended to apply coating liquids such as paints efficiently and uniformly to the material to be coated. It does not fit the purpose of the invention.
JP 2000-246187 A Japanese Patent Laid-Open No. 7-1610

On the other hand, in the technique of wax coating on the floor surface, which plays a part in the coating technique, instead of the conventional method of coating using a mop, a coating apparatus and a coating apparatus for coating by supplying a wax liquid to the floor surface and coating Various traveling wax coating and drying apparatuses have been proposed that include a blower drying apparatus that dries a wax liquid, applies the wax liquid while moving on the floor surface, and dries the wax liquid.
For example, Japanese Patent Laid-Open No. 3-101869 (Patent Document 6) states that “a floor coating agent applicator in which an applicator for applying a coating agent solution to a floor surface is attached to a mobile body, and the applicator is moved up and down. A floor coating agent applicator provided with an applicator drive mechanism that rotates and moves along the floor surface while being vibrated is disclosed, and Japanese Patent Application Laid-Open No. 6-17527 (Patent Document 7) discloses “ Accordingly, the floor coating agent is applied to the floor surface by the coating device and the coating film coating agent is dried by the drying air supplied by the drying air supply device, and the minimum film forming temperature is 45 ° C. or less. There is a disclosure of a “floor coating agent coating method” in which an acrylic floor coating agent having a minimum film forming temperature of 5 ° C. or less is applied by adding a minimum film forming temperature reducing agent to a coating agent base material.

  Japanese Patent Laid-Open No. 8-308778 (Patent Document 8) states that “a wax tank is placed on the upper stage of the carriage, and an appropriate amount of wax is dropped on the traveling floor of the carriage on the front part of the lower stage. In the center of the wax dropping device, a wax extension coating device for extending and applying the dropped wax is installed, and in the rear part thereof, a dryer for drying the applied wax is installed. A wax coating and drying apparatus for floors, characterized in that the wax coating and drying of the surface can be carried out continuously is disclosed.

Further, Japanese Patent Laid-Open No. 9-299854 (Patent Document 9) states that “a wax supply and application device for supplying and applying a wax liquid to the floor surface in the traveling direction of the carriage is provided in the rear part of the carriage. Is a traveling wax coating and drying device provided with a coating wax heating and drying device for drying the wax liquid supplied and coated on the floor surface, wherein the coating wax heating and drying device has a heating heater supply source for drying at the front. A traveling wax coating and drying apparatus is disclosed that includes a flat-tailed duct with a bottom opening at the rear portion thereof, and an opening portion in the horizontal direction at the rear end of the duct.
Japanese Patent Application Laid-Open No. 9-299855 (Patent Document 10) states that “a wax supply and application device for supplying and applying a wax liquid to the floor surface in the traveling direction of the carriage is provided in front of the carriage, and the latter half of the carriage. In the traveling wax coating and drying device provided with a coating wax heating and drying device for drying the wax liquid supplied and coated on the floor surface, the coating wax heating and drying device has a heating gas supply source for drying at the front. A flat tail long duct having a lower surface opening at a rear portion thereof, and a branch circulation passage between the flat tail long duct having the lower surface opening and a heating gas supply source for drying. A traveling wax coating and drying apparatus characterized by having a horizontal opening at the rear end is disclosed.

Furthermore, in Japanese Patent Laid-Open No. 9-299856 (Patent Document 11), a wax supply and application device for supplying and applying a wax liquid to the floor surface in the traveling direction of the carriage is provided in the rear part of the carriage. Is a traveling wax coating and drying device provided with a coating wax heating and drying device for drying the wax liquid supplied and coated on the floor surface, wherein the coating wax heating and drying device has a drying gas supply source at the front. A turbulent flow promoting mechanism is provided inside the front ceiling wall of the flat tail long duct with the lower surface opening, and at the rear end of the duct. A traveling wax coating and drying apparatus characterized by having an opening in a direction ", and Japanese Patent Application Laid-Open No. 9-299857 (Patent Document 12)," Progress of the carriage in front of the carriage "is disclosed. A wax supply and application device for supplying and applying a wax liquid to a floor surface facing the vehicle, and a traveling wax having a coating wax heating and drying device for drying the wax liquid supplied and applied to the floor surface in the latter half of the carriage In the coating / drying apparatus, the wax supply / coating apparatus is provided with a wax pouring pipe that is suspended from a rotating shaft and is swung to the left and right, and the tip of the wax pouring pipe is swung to the left and right as the carriage travels. A traveling-type wax coating and drying apparatus is disclosed in which the wax is moved and the wax is widely supplied in a zigzag shape from the front end to the floor surface.
Japanese Patent Laid-Open No. 3-101869 JP-A-6-17527 JP-A-8-308778 JP-A-9-299854 JP-A-9-299855 JP-A-9-299856 Japanese Patent Laid-Open No. 9-299857

  In Patent Documents 6 to 12 exemplified above, there is a description that a vibration-type applicator, a rotary applicator, a brush, etc. can be used as an applicator for a traveling wax application / drying apparatus in addition to a sheet-like applicator. No specific structure or material of the applicator is disclosed.

   In addition, in the supply method disclosed in Patent Document 11 in which the wax liquid is dropped while the tip of the pouring pipe is swung left and right, the problem that the wax is dropped in a zigzag shape, and thus the adhesion amount also changes in a zigzag shape is solved. In addition, in the method in which the wax liquid is dropped from the extraction pipe having a large number of extraction holes, the amount of adhesion in the width direction is reduced depending on the interval between the extraction holes and the diameter of the extraction holes. The problem of equilibrium was left.

  Furthermore, all of the applicators of the traveling wax application / drying devices of Patent Documents 6 to 12 apply wax while rubbing the floor surface, and dust that has fallen on the floor surface adheres to the applicator. Then, there is also a problem that a streaky coating flaw occurs along the traveling direction of the wax coating apparatus and a good finished surface cannot be obtained.

  In view of the above-mentioned background art, an object of the present invention is to rapidly and efficiently apply various coating liquids such as paint and floor wax liquid by a rotary coating roll using a cylindrical porous resin body having continuous pores. Another object of the present invention is to provide a coating apparatus that can be uniformly coated without being affected by the unevenness of the coated surface of the material to be coated and that can dry the coated coating solution at high speed.

The inventors of the present invention have made extensive studies and solved the above problems by the following means.
(1) In a coating apparatus having a rotary coating roll, the rotary coating roll has a coating liquid injection port at one end, and a plurality of coating liquid outflow holes are formed in the cylindrical wall, and the vicinity of both ends thereof Application characterized by comprising a hollow cylindrical shaft core that is rotatably supported by a roll chock, and a cylindrical porous resin body having continuous pores mounted on the outer surface of the shaft core. apparatus.
(2) The shaft core has a coating liquid injection port at one end, a plurality of coating liquid outflow holes are formed in the cylindrical wall, and both ends of the shaft core are rotatably supported by a roll chock. It is formed in a double tube structure with a cylindrical inner tube and a hollow cylindrical outer tube having a plurality of coating liquid outflow holes on the cylindrical wall with the inner tube roll chock support portions protruding at both ends. The coating apparatus according to item (1), wherein:

(3) The coating apparatus according to any one of (1) to (3), wherein the cylindrical porous resin body having continuous pores is made of a polyvinyl alcohol resin or a polyurethane resin. .
(4) The polyvinyl alcohol-based porous resin body having continuous pores as described in (3) above has continuous pores having a small diameter in the inner and outer surface layers of the roll, and the inner and outer surface layers of the roll are continuous with the inner and outer surface layers. A coating apparatus comprising continuous pores having a large diameter communicating with pores.

(5) Any one of the preceding items (1) to (4), wherein the rotary coating roll is configured to be controllable so as to rotate at a peripheral speed faster than a coating speed on the surface of the material to be coated. The coating device according to item.
(6) In the above item (5), the rotary coating roll is configured to be able to rotate at a peripheral speed that is 10 to 120% faster than a speed driven by contact with the surface of the material to be coated. The coating apparatus as described.
(7) A plurality of grooves for securing a cylindrical porous resin body having continuous pores are formed on the outer surface of the shaft core of the rotary coating roll along the length direction of the shaft core. The coating apparatus according to any one of the preceding items (1) to (6), wherein
(9) The coating apparatus according to (1) or (2), wherein the coating solution is a floor wax.

The following effects are obtained by the coating apparatus of the present invention.
<1> A rotary coating roll used in the coating apparatus has a coating liquid inlet at one end, and a plurality of coating liquid outflow holes are formed in the cylindrical wall, and the vicinity of both ends is rotated by a roll chock. Since it is composed of a hollow cylindrical shaft core that is movably supported and a cylindrical porous resin body having continuous pores mounted on the outer surface of the shaft core, manual application by mop or block Compared with a conventional coating apparatus in which a coating liquid is applied by vibrating a plate-shaped or sheet-shaped coating tool, it is possible to perform coating with a uniform finish at high speed and without uneven coating over the entire coating area.

  <2> Since the coating solution is temporarily stored in the hollow cylindrical shaft core and in the pores of the cylindrical porous resin body having continuous pores, the coating liquid supply from the coating liquid tank Even if the amount varies, the amount of coating solution supplied to the surface of the coated material will not be directly affected, and a uniform amount of coating solution can be supplied over the entire surface of the coated material, resulting in a beautiful finish. A coated surface is obtained.

  <3> The rotary coating roll has a coating liquid supply port at one end, and a plurality of coating liquid outflow holes are formed in the cylindrical wall, and both ends thereof are supported by a roll chock so as to be rotatable. It is composed of a cylindrical shaft core and a cylindrical porous resin body having continuous pores mounted on the outer surface of the shaft core, and the shaft core has a coating liquid supply port at one end. And a hollow cylindrical inner tube having a plurality of coating liquid outflow holes formed in the cylindrical wall, the ends of which are rotatably supported by a roll chock, and attachment portions of the inner tube to the roll chock at both ends. And the coating liquid supplied to the hollow portion of the inner pipe is the inner pipe. Move from the coating liquid outflow hole on the tube wall to the hollow part of the outer tube, and then move forward from the coating liquid outflow hole on the tube wall of the outer tube. In the course of moving to the porous resin body, evenly distributed supply coating liquid to the entire porous resin body allows no uniform coating is uneven coating.

  <4> The rotary coating roll is configured to be controllable so as to rotate at a peripheral speed faster than the speed driven by contact with the surface of the material to be coated, so that the drying speed of the coated coating solution is increased. In addition, since the rotary coating roll slides on the floor surface, the coating liquid can be evenly applied even to uneven coating materials.

  <5> A plurality of grooves for securing a cylindrical porous resin body having continuous pores are cut along the length direction of the shaft core on the outer surface of the shaft core of the spin coating roll. Therefore, the adhesion between the shaft core and the porous resin body is enhanced, and the occurrence of the problem that the porous resin body does not follow the rotation of the shaft core and idles can be eliminated.

An embodiment of a coating apparatus of the present invention will be described based on the drawings of the examples.
FIG. 1 is an explanatory view of the structure of the wax supply and application apparatus of the present invention, and FIG. 2 is a sectional view of a rotary application roll.
In FIG. 1, 20 is a porous resin body having continuous pores, 21 is an outer tube, 21a is a coating liquid outflow hole on the outer tube cylinder wall, 21b is a groove, 22 is an inner tube, and 22a is a tube wall of the inner tube. Liquid outflow hole for coating, 23 is a roll chock with a bearing, 24 is a roll chock support spring, 25 is a rotary screw, 26 is a carriage frame, 28 is a rotary joint, 29 is a liquid feed tube, 30 is a running speed and a roll rotational speed. A wheel directly connected to the timing belt for acceleration / deceleration is shown.

  As shown in FIG. 1, the coating apparatus according to the present invention includes a rotary joint 28 serving as a coating liquid supply port at one end, and a plurality of coating liquid outflow holes 22a are formed in the cylindrical wall. Has a hollow cylindrical inner tube 22 rotatably supported by a roll chock 23 provided with a bearing, and a mounting portion of the inner tube 22 to the roll chock 23 is protruded at both ends so that a plurality of coating liquids are formed on the cylinder wall. A cylindrical porous resin body 20 having an axial core formed in a double tube structure with a hollow cylindrical outer tube 21 having an outflow hole 21a and a continuous pore on the outer surface of the outer tube 21. Is formed. The roll chock 23 is suspended from a cart frame 26 via a roll chock support spring 24.

  The rotary coating roll pierces the inner tube wall from the coating solution injected into the hollow cylindrical body of the inner tube 22 from a liquid feeding tube 29 connected to a rotary joint 28 provided at one end of the inner tube 22. A cylindrical porous resin body 20 provided with continuous pores in the outer tube 21 through the coating liquid outflow hole 21a formed in the outer wall 21 through the coating liquid outflow hole 21a. The rotary coating roll is pressed against and rotated on the surface to be coated, and the coating liquid is supplied to the material to be coated to enable coating.

  Further, in the rotary coating roll, the wheel 30 which is a part of a mechanism for making the peripheral speed of the circular porous resin body 20 faster than the speed driven by welding to the material to be coated is the inner tube 22. It is attached to the end.

  The porous resin body 20 having continuous pores used for the spin coating roll is required to be a material having a high water absorption rate, rich elasticity, and excellent wear resistance. As a result of various investigations for a porous resin body that can be formed into a cylindrical shape from among a large number of porous resin bodies and has the above characteristics, in particular, PVA (polyvinyl alcohol) resin sponges and polyurethane resin sponges It was found to be suitable.

The PVA sponge roll used in the present invention is prepared by, for example, adding an aldehyde as a crosslinking agent, a mineral acid as a catalyst, and a starch as a pore-forming agent to a completely or partially saponified polyvinyl alcohol aqueous solution having a polymerization degree of about 500 to 3000. In addition, the mixture is stirred uniformly, poured into a predetermined mold, and reacted at a temperature of about 50 to 80 ° C. for about 10 to 20 hours. The porous elastic body is about 80 to 95%. It has a porosity and an average pore diameter of about 30 to 300 μm.
PVA sponge rolls (trade name: Cygnus Roller, manufactured by Aion Co., Ltd.) having characteristics of a porosity of 90%, a water retention rate of 1100 wt%, and a pore diameter of 150 to 300 μm are preferable.
FIG. 6 shows a photograph of the porous structure inside and inside the PVA sponge. As can be seen in FIG. 6, even if this PVA sponge looks like a solid block, 90% or more of its volume is hollow (pores) when viewed with microscopic eyes, forming a three-dimensional network structure. Individual pores have a continuous porous structure. Further, from FIG. 6, small-diameter continuous pores are opened on the surface, and an appropriate amount of the coating liquid stored in the large-diameter continuous pores oozes out from the small-diameter continuous pores on the surface. It can be easily understood that it is effectively supplied to the floor surface. This sponge is flexible and elastic in the wet state, and has a feature that does not damage the surface of the material to be coated.

The polyurethane sponge roll used in the present invention is prepared by adding a salt such as sodium sulfate, which can absorb crystal water, to an aqueous dispersion of a polyurethane elastomer, stirring the mixture, and absorbing the moisture into the salt to obtain a powdery mixture. Water-soluble salts such as sodium chloride are added and kneaded to form a fluid, which is then poured into a mold, dried and heat-treated, then washed with water to remove the salts and molded The porous polyurethane resin body has a porosity of about 60 to 90% and an average pore diameter of about 10 to 300 μm.
Examples of the polyurethane resin sponge suitably used include a porosity of 83%, a water retention rate of 400 wt%, and a pore diameter of 25 μm (trade name Soflas, manufactured by Aion Co., Ltd.).
This polyurethane-based sponge is a continuous porous resin body having high heat resistance that can be used stably even in an environment of 100 ° C. or higher and in water of 100 ° C., and exhibits a very flexible texture even in a dry state or a wet state. . It is stable against salts and has resistance to alcohol, acid, and alkali.

The roll width and outer diameter of the rotary coating roll are set according to the usage environment such as the type and nature of the coating liquid, the shape, structure, and size of the material to be coated. The roll width is preferably up to 1000 mm and the outer diameter is up to 125 mm. If the roll width exceeds 1000 mm, it may be difficult to uniformly supply the coating liquid over the entire width of the rotary coating roll, and if the outer diameter exceeds 125 mm, the coating is temporarily stored in the rotary coating roll. Since the amount of the application liquid becomes excessive and the response when the application amount of the application liquid is controlled may deteriorate, it is not preferable.
The cylindrical porous resin body having continuous pores is preferably a polyvinyl alcohol resin or a polyurethane resin, but is not limited to this, and has the above-described high water absorption rate and elasticity. Any material can be used as long as it satisfies the requirements of a rich and wear-resistant material.

  Further, if the degree of adhesion between the porous resin body 20 and the outer tube 21 is not sufficient, the friction generated when the cylindrical porous resin body 20 is pressed against the floor surface and rotated in order to apply the coating liquid onto the floor surface. There is a risk that the porous resin body 20 may not be able to follow the rotation of the outer tube 21 due to the shearing force and idle. When an adhesive such as rubber, vinyl chloride or vinyl acetate is used for bonding the outer tube 21 and the cylindrical porous resin body 20, the adhesive force of these adhesives gradually decreases due to the action of the coating solution. However, it may be difficult to maintain the adhesion between the outer tube 21 and the porous resin body 20. For this reason, in the present invention, in order to maintain and improve the adhesion between the outer tube 21 and the porous resin body 20, at least four locations on the outer periphery of the outer tube 21, as shown in FIG. For example, a groove 21b having a depth of 2 to 5 mm and a width of 2 to 5 mm is preferably provided over the entire area. The groove 21b can enhance the adhesion between the iron outer tube 21 and the cylindrical porous resin body 20 without an adhesive.

In the coating apparatus of the present invention, the coating liquid to be applied to the surface of the material to be coated is required in the hollow portion of the inner tube 22 of the rotary coating roll through the rotary joint 28 from the liquid feeding tube 29 as shown in FIG. An amount is injected. This injection amount is controlled in accordance with the application speed to the application material and the target application amount.
The coating liquid supplied to the hollow portion of the inner tube 22 passes from the plurality of coating liquid outflow holes 22a formed in the cylindrical wall of the inner tube 22 to the hollow portion of the outer tube 21, and further to the cylindrical wall of the outer tube 21. The porous resin body 20 moves from the plurality of coating liquid outflow holes 21a formed in the porous resin body 20 and is temporarily stored in the large-diameter continuous pores inside the porous resin body 20.
Then, the coating liquid stored inside the porous resin body 20 reaches the surface of the porous resin body 20 through the continuous pores having a small diameter opened on the surface of the porous resin body 20, and the porous resin body 20. The surface of the porous resin body 20 is supplied and applied to the material to be coated by contacting and rotating the material to be coated.

The amount of the application liquid applied to the material to be applied is controlled by the amount of the application liquid injected into the inner tube 22 and the application speed to the material to be applied. For example, if the amount of the coating liquid injected into the inner tube 22 is constant, if the coating speed to the material to be coated is slow, the coating amount per unit area of the material to be coated increases, resulting in a thick coating. As the speed increases, the coating amount per unit area of the material to be coated decreases, resulting in thin coating.
Incidentally, the coating amount per unit area when the coating liquid is a floor wax liquid is preferably in the range of 2.5 to 15 g / m ² , more preferably in the range of 5 to 10 g / m ^2. . When the coating amount is less than 2.5 g / m ^2, the glossiness of the finished surface coated with the coating liquid is insufficient, and when it exceeds 15 g / m ² , the drying speed is remarkably slowed and the efficiency of the coating work is reduced. Become. Therefore, the injection amount of the floor wax liquid into the inner tube 22 and the coating speed on the floor surface are controlled so as to be the above-mentioned preferable application amount.

The shaft core of the rotary coating roll of the present invention has a double tube structure of the inner tube 22 and the outer tube 21 because the coating liquid injected from one end into the hollow portion of the inner tube 22 is formed in the cylindrical shape. The outer diameters of the inner tube 22 and the outer tube 21 and the diameters of the application liquid outflow holes 22a and 21a that are bored in the cylindrical walls of the inner tube 22 and the outer tube 21. The number and the arrangement thereof are appropriately determined according to the shape, structure, size, and viscosity of the coating liquid to be used. For example, when floor wax liquid is used as the coating liquid, the outer diameter of the outer tube is preferably 40 to 125 mm, and the outer diameter of the inner tube is preferably 20 to 60 mm. It is preferable to provide a coating solution outflow hole having a diameter of 2 to 4 mm and an inner tube of 3 to 6 mm. Further, by reducing the diameter of the coating liquid outflow holes 22a and 21a near the coating inlet into which the coating liquid flows, and increasing the diameter beyond the central portion, the floor wax liquid from the porous resin body 20 is increased. It is also preferable to make the amount of exudation uniform.
The intervals between the coating liquid outflow holes 22a of the inner tube 22 and between the coating liquid outflow holes 21a of the outer tube 21 are appropriately selected according to the outer diameter of the cylindrical porous resin body. Taking into consideration that the floor wax liquid spreads uniformly on the surface of the porous resin body 20, the thickness is preferably 1.5 to 3 times the wall thickness of the porous resin body 20.

  The “pushing depth” of the porous resin body 20 into the material to be coated is controlled by the load applied to the shaft core that supports the porous resin body 20, and the depth is preferably in the range of 2 to 10 mm. . If it is less than 2 mm, there may be a portion that is not applied due to the unevenness of the surface of the material to be coated, and if it is pushed deeper than 10 mm, the coating liquid stored in the central portion of the porous resin body 20 is pressed by the pressure. The amount of the coating liquid applied to the surface of the material to be coated with which the end portion of the porous resin body 20 comes into contact with the end portion of the porous resin body 20 increases due to movement to the end portion of the porous resin body. The uniformity of the coating amount will be impaired. Moreover, the compression to the porous resin body 20 is strengthened, and the durability of the porous resin body 20 is impaired.

The rotational speed of the cylindrical porous resin body 20 is controlled so that the peripheral speed of the porous resin body 20 is 10% to 120% of the speed at which the porous resin body 20 is driven by contact with the material to be coated. %, More preferably 20% to 100%. It has been found that drying is accelerated by rotating the rotary application roll at a peripheral speed faster than the speed driven by contact with the material to be coated, and the peripheral speed of the porous resin body 20 is controlled. By this, when the rotating porous resin body 20 comes into contact with the floor surface and is pushed in, it is possible to eliminate the fine foaming phenomenon of the coated surface caused by the air entrained at the tip portion, and further, by sliding the floor surface, The effect of improving the coating finish on the surface of a material to be coated has also been recognized.
If the peripheral speed of the porous resin body 20 is increased or decreased within a range of less than ± 10% with respect to the speed at which the coating device is driven by contact with the writing material, the improvement of the drying speed is not seen, and 120% If it exceeds, the friction between the floor surface and the porous resin body 20 becomes excessive, and the degree of wear and breakage of the porous resin body 20 becomes remarkable, which is not preferable.

In order to demonstrate the effect of the coating apparatus of the present invention, a coating / drying test apparatus shown in FIG. 3 was prepared, a floor wax was used as a coating liquid, a P tile was used as a material to be coated, and a cylinder with continuous pores. The porous porous porous resin body was subjected to a coating test using a spin coating roll.
As shown in FIG. 3, the coating and drying test apparatus is provided with a rotary coating roll for coating a coating liquid on the surface of a material to be coated on the upper side and a coating backup roll for moving the material to be coated on the lower side. A coating liquid supply / coating section, a belt conveyor for transporting the coating material to which the coating liquid is coated, and a drying furnace for drying the coating liquid coated on the surface of the coating material transported by the belt conveyor And a circulating electric hot air dryer that is disposed directly above the conveyor and supplies hot air for drying to the drying furnace for suction.
As the rotary coating roll, a PVA sponge roll having an inner diameter of 38 mm, an outer diameter of 77 mm, and a length of 270 mm is used in close contact with the outer periphery of the double-pipe shaft, and the rotary coating roll moves up and down. The pressing depth of the rotary coating roll onto the surface of the material to be coated can be adjusted by the handle with the degree of compression of the spring.
On the other hand, the application backup roll is a urethane roll having an outer diameter of 77 mm, and its shaft core is pivotally attached to and fixed to the frame of the wax supply application section.
The rotary application roll and the application backup roll were each driven by an independent motor.
The rotary coating roll is configured to be supplied with a coating solution from a coating solution tank via an electromagnetic metering pump and a liquid feeding tube.

  The P tile (composition vinyl floor tile MV43 (orange), thickness 2 mm, 303 mm square, manufactured by Toli Co., Ltd.) used as a material to be applied in this evaluation test was applied to the surface of the application liquid supply application unit. After the wax liquid is applied, it is transferred to a conveyor installed adjacent to the application liquid supply application section, and passes through a drying furnace in which hot air is sent from the circulating electric hot air dryer through a duct. And is transported to the end of the conveyor. The drying furnace is a box having a width of 400 mm, a length of 800 mm, and a height of 100 mm. A hot air is circulated by providing a discharge duct from a circulating electric hot air dryer on the inlet side and a suction duct on the outlet side. ing.

Using the coating liquid application drying test apparatus provided with the mechanism as described above, when the PVA sponge roll is a rotary coating roll, a plurality of rotation speeds of the PVA sponge roll and the coating backup roll are made different. An application test was conducted at different peripheral speed ratios.
Here, the “different peripheral speed ratio” is the rate of change of B with respect to A when the peripheral speed of the rotary coating roll is A and the driven speed due to contact with the material to be applied is B, that is, {(AB) ) / B} × 100. When A is larger than B, it is referred to as “forward differential speed ratio”, and when A is smaller than B, it is referred to as “reverse differential speed ratio”.
In this application experiment, the pressing depth of the PVA sponge roll was 1.5 mm, and the conveyor speed was 1.0 km / hour.
Further, acrylic floor wax (trade name: Space Shine, trademark of Orb Tech Co., Ltd.) was used as the coating solution. This wax is a main component of acrylic copolymer dispersion, and contains 25% solids containing polyethylene wax, vinyl copolymer, acrylic solution, emulsifier such as tris phosphate, diethylene glycol monomethyl ether, plasticizer, and film forming temperature reducing agent. It is a sex floor wax.

  In this application experiment, the dry state of the floor wax solution applied to the P tile of the material to be applied was evaluated by observing the stickiness of the P tile application surface at a position 200 mm from the outlet of the drying furnace. Further, the temperature of the drying furnace is measured together with the wind speed by arranging a pitot tube with a thermocouple at the opening of the discharge duct of the circulating electric hot air dryer, the temperature of the drying furnace is 100 ° C., and the wind speed of the hot air is 9.5. ˜10.5 m / sec.

The amount of wax applied to the surface of the P tile was obtained by cutting the 303 mm square P tile into a 100 × 303 mm square and calculating the difference between the weight of the cut P tile before the wax application and the weight after the application. The amount of wax applied was varied by adjusting the amount of wax supplied from the electromagnetic metering pump.
The running speed of the belt conveyor and the rotational peripheral speed of the coating backup roller were synchronized so that the P tile of the coating material could be smoothly moved from the coating liquid supply and coating section to the belt conveyor. Furthermore, the coating and drying test was conducted with the environmental conditions in the test chamber as the temperature 24-27 ° C. and the relative humidity 52-60%.

(Evaluation Test 1)
Under the above-described conditions, the relationship between the forward different peripheral speed rate in which the rotational speed of the rotary coating roll with respect to the coating backup roll of the coating liquid supply application unit was increased, and the reverse different peripheral speed rate in which the rotational speed was decreased, and the degree of drying was investigated. The result is shown in FIG. In the figure, evaluation of the degree of stickiness was displayed as “X” for those with stickiness, “◯” for those without stickiness, and “Δ” for those in between. In addition, the reverse reverse peripheral speed ratio is displayed in minus.
As can be seen from FIG. 4, when the different peripheral speed rate is 10% or more of the forward different peripheral speed ratio, the stickiness disappears at the same amount of wax adhesion, and the drying speed is higher than the case of the same speed (different peripheral speed ratio 0%). Was found to be faster. On the contrary, stickiness remained in the case of the reverse different peripheral speed ratio in which the rotational speed of the spin coating roll was delayed as compared with the coating backup roll, and no improvement in the drying speed was obtained.

(Evaluation test 2)
Next, the different peripheral speed ratio was set to 0% (when the rotary coating roll and the coating backup roll rotate at the same speed) and the forward different peripheral speed was set to 50%, and the drying time of the wax was investigated by changing the conveyor speed.
FIG. 5 shows the results when the acrylic floor wax (space shine) is used as the coating solution.
Referring to FIG. 5, when the peripheral speed rate is 50% (forward differential speed 50%) than when the peripheral speed ratio is 0%, there is no stickiness even when the traveling speed of the belt conveyor is high. I understand. That is, it can be dried even if the time of passing through the drying furnace is short, and therefore, the speed of rotating the rotating coating roll is faster than the rotating speed of the coating backup roll, and the drying speed of the floor wax is increased. Although the degree varies depending on the wax used, the drying speed can be increased by about 50 to 100%, the operation time of the wax coating / drying apparatus can be shortened, and the effect of improving the efficiency of the wax coating work is great. In addition, if it is the same as the conventional operation time, application work can be done with less power, a smaller hot air drying furnace, a smaller output storage battery can be installed, and a smaller and lighter wax application drying apparatus Can do.

  The reason why the drying speed increases when the rotation speed of the rotary coating roll is faster than the rotation speed of the coating backup roll while maintaining the same adhesion amount level is not clear, but the rotational speed of the rotary coating roll and the coating backup roll. Are the same or when the rotating roll is slowed down, fine bubbles are observed on the wax surface applied to the P tile of the material to be coated, whereas the rotational speed of the rotating roll is set to When the speed is increased, the fine bubbles are not observed on the wax surface of the P tile. From this, it is surmised that the disappearance of fine bubbles having a heat insulating effect has an effect of increasing the coating and drying speed.

(Evaluation Test 3)
Finally, a traveling wax coating / drying apparatus having the structure shown in FIG. 7 equipped with the coating apparatus of the present invention was manufactured, and a wax coating test was performed on the floor surface. In FIG. 7, 1 is a wax supply and application device, 2 is a wax tank, 3 is a wax supply pump, 4 is a blower, 5 is an electric duct heater, 6 is a drying furnace, 7 is a battery, 8 is an inverter, and 9 is a travel drive motor. Reference numeral 10 denotes a drive wheel, 11 a slave wheel, 12 a control device, 13 an operation panel, 14 an operation handle, 15 a timing belt, and 16 a timing belt drive wheel.
The traveling wax coating / drying apparatus of the present invention includes a wax supply / coating apparatus 1 for supplying and applying a wax liquid to a floor surface in the traveling direction of the carriage in front of the carriage, and a wax liquid applied to the latter half of the carriage. A series of apparatuses for heating and drying is mounted, and the wax supply and application apparatus 1 for supplying and applying a wax liquid to a floor surface to be coated is a roll 20 of a porous resin body having continuous pores. It comprises the applicator which becomes.
That is, as shown in FIG.
A wax supply unit comprising a wax tank 2 for storing wax applied to the floor to be applied, and a wax supply pump 3 for supplying the wax stored in the wax tank to the wax supply and application device 1;
A wax supply and applicator device 1 provided with a roll-type applicator for applying wax to the application floor;
A heating and drying device comprising a blower 4 and an electric heating duct heater 5 for sending hot air to a drying furnace 6 provided at the bottom of the carriage for drying the applied wax;
A battery 7, an inverter 8, a control device 12, an operation panel 13, and an operation handle 14 for driving and operating the traveling wax coating and drying device,
It is mounted on a carriage having a drive wheel 10 and a driven wheel 11.
The roll-type applicator of the wax supply and applicator 1 is a cylindrical porous resin body 20 having continuous pores, and the peripheral speed of the roll-type applicator is the travel speed of the travel-type wax application / drying device. The wheel 30 (see FIG. 2) attached to the end of the inner tube 22 of the roll type applicator, which will be described later, and an intermediate portion of the shaft that transmits power from the travel drive motor to the drive wheels 10 so as to be faster. A timing belt 15 is stretched between a timing belt drive wheel 16 mounted on a horizontal rotating shaft that is rotated by power branched through a gear box.
The wax supply and coating device 1 of the traveling wax coating and drying device includes a cylindrical PVA sponge roll (trade name: Cygnus Roll, manufactured by Aion Co., Ltd.) having a cylindrical inner diameter of 38 mm, an outer diameter of 100 mm, and a width of 400 mm. ) Was used.

Then, as a shaft core of the paint tool to which the PVA sponge roll is attached, a double tube structure shaft core composed of the inner tube 22 and the outer tube 21 shown in FIG.
The inner tube 22 has a hollow cylindrical structure with an outer diameter of 25 mm and an inner diameter of 13 mm, and a coating wall with a 6 mm diameter liquid outflow hole 22 a on the tube wall at intervals of 50 mm in two rows and two rows. Two rows of objects were alternately arranged at intervals of 90 degrees in the circumferential direction.
Further, the outer tube 21 has two rows of five pipes each having an outer diameter of 38 mm, an inner diameter of 32.9 mm, and a length of 400 mm, and three coating liquid outflow holes 21a at intervals of 40 mm in the width direction. Two individual rows were alternately arranged at intervals of 90 degrees in the circumferential direction. The outer tube 21 was sealed at both ends of the pipe by welding the cylindrical wall of the inner tube 22 and the end of the outer tube 21 to form a double hollow tube structure.
A rotary joint 28 serving as a wax liquid inlet is attached to one end of the inner tube, and a roll chock 23 suspended from a carriage frame 26 via screws 25 and a roll chock support spring 24 is attached to both ends. .

A liquid feeding tube 29 was attached to the rotary joint 28 and connected to the wax tank 2 via the wax supply pump 3. As the wax supply pump 3, an electromagnetically driven fixed injection pump (maximum flow rate 400 mL / min) is used. The above-mentioned set of wax supply and application device 1 is arranged in front of the chassis, and a blower 4 (maximum) immediately after the wax supply and application device 1. Air flow rate 16m ³ / min, maximum static pressure 1.6 kpa) and duct type electric heater (2.5 kW) 5 connected to this are provided, and its lower surface is 450 mm wide, 800 mm long, 100 mm inlet side height, outlet side A drying furnace 6 having a height of 30 mm was disposed. In addition, it is equipped with a battery (12V-120Ah, 4 units, 2 units in series) 7, an inverter 8 that converts battery power (24V) to hot air blower power 100V, a control device 12, and an operation panel 13 that can run at a speed of 4km / hour. A simple traveling wax coater was assembled. Further, in order to make the rotational speed of the rotating shaft faster than the traveling speed, a wheel 30 attached to the end portion of the inner tube 22 and a gear provided in an intermediate portion of the shaft for transmitting power from the traveling drive motor to the drive wheels 10. The timing belt 15 was stretched between the timing belt drive wheels 16 mounted on the horizontal rotation shaft that is rotated by the power branched through the box, and the peripheral speed was increased by 25%.

As described above, a traveling wax coating / drying machine having a mechanism capable of increasing the roll peripheral speed with respect to the traveling speed is manufactured using the cylindrical porous resin body 20 having both ends tapered, and the P tile Wax was applied to the floor of the building. For the wax, use the trade name Progloss manufactured by Penguin Wax Co., set the replenishment amount from the electromagnetic metering pump with a target of 7.5 g / m ³ and apply a floor area of 600 m ² at a running speed of 1.5 km / h. As a result, there was no excessive coating amount at the end of the rotary coating roll over the entire width of 400 mm, and a uniform finish was obtained.

The present invention relates to a coating apparatus characterized in that a rotary coating roll for supplying and coating a coating liquid such as paint or wax is made of a porous resin body having continuous pores, and further, the rotary coating The roll comprises a multi-tube structure shaft core and a cylindrical porous resin body mounted on the outer surface thereof, and a coating apparatus having a structure in which a coating liquid is supplied from the shaft core to the porous resin body It is about.
Therefore, it has the possibility of being used as a paint application device that can be used for painting interior and exterior wall surfaces of ordinary houses, buildings, fences, ships, etc., including a running wax application device that applies wax to the floor surface. It has become.

Structural explanatory diagram of wax supply and application equipment Cross section of spin coating roll Configuration diagram of wax application drying test equipment A graph showing the relationship between the different peripheral speed of the spin coating roll and the drying effect The graph which shows the drying speed at the time of different peripheral speed rate 0% and 50% of a rotation application roll Photo showing the state of continuous pores inside and inside the porous resin body The block diagram of one Example of the traveling wax application | coating drying apparatus using the coating device of this invention

Explanation of symbols

1: Wax supply application device 2: Wax tank 3: Wax supply pump 4: Blower 5: Electric heat duct heater 6: Drying furnace 7: Battery 8: Inverter 9: Driving drive motor 10: Driving wheel 11: Driven wheel 12: Control device 13: Operation panel 14: Operation handle 15: Timing belt 16: Timing belt drive wheel 20: Porous resin body provided with continuous pores 21: Outer pipe 21a: Liquid outflow hole for coating on outer pipe cylinder wall 21b: Groove 22: Inner pipe 22a: Liquid outflow hole for coating on inner cylinder wall 23: Roll chock with bearing 24: Roll chock support spring 25: Rotating screw 26: Bogie frame 28: Rotary joint 29: Liquid feeding tube 30: Travel speed and roll A wheel directly connected to a timing belt that accelerates or decelerates the rotation speed

Claims (8)

  In a coating apparatus having a rotary coating roll, the rotary coating roll has a coating liquid inlet at one end, and a plurality of coating liquid outflow holes are formed in the cylindrical wall, and both ends thereof are rotated by a roll chock. A coating apparatus comprising: a hollow cylindrical shaft core that is movably supported; and a cylindrical porous resin body having continuous pores attached to an outer surface of the shaft core.   The shaft core has a hollow cylindrical shape having a coating liquid inlet at one end, a plurality of coating liquid outflow holes formed in the cylindrical wall, and both ends thereof being rotatably supported by a roll chock. The inner tube and a roll-chock support portion of the inner tube protrude from both ends, and are formed in a double tube structure with a hollow cylindrical outer tube having a plurality of coating liquid outflow holes on the cylindrical wall. The coating apparatus according to claim 1.   The coating apparatus according to any one of claims 1 to 3, wherein the cylindrical porous resin body having the continuous pores is made of a polyvinyl alcohol resin or a polyurethane resin.   The polyvinyl alcohol porous resin body having continuous pores according to claim 3, wherein the inner and outer surface layers of the roll have continuous pores having a small diameter, and the inner layer of the roll communicates with the continuous pores of the inner and outer surface layers. A coating apparatus having continuous pores with a large diameter.   The said rotation application | coating roll is comprised so that control is possible so that it may rotate by the peripheral speed faster than the speed driven by contact | abutting to a to-be-coated material surface. The coating apparatus as described in.   6. The coating according to claim 5, wherein the rotation coating roll is configured to be controllable to rotate at a peripheral speed that is 10 to 120% faster than a speed driven by contact with the surface of the material to be coated. apparatus.   A plurality of grooves for securing a cylindrical porous resin body having continuous pores are formed on the outer surface of the shaft core of the rotary coating roll along the length direction of the shaft core. The coating apparatus according to any one of claims 1 to 6. The coating apparatus according to claim 1, wherein the coating solution is a floor wax.