JP2002035646A - Pile applying method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a new working method of the surface of a base material using pile. SOLUTION: In the pile applying method by coating the surface of the base material with pile by transporting the pile to an electrifying chamber of an electrostatic spray gun (20) with air, charging the pile in the electrostatic spray gun, spraying the pile on the surface of the base material having an adhesive layer on the surface from a spray port of the electrostatic spray gun by the transporting air and the spraying air introduced into the electrifying chamber, humidified air (the humidified air adjusted to a prescribed relative humidity is supplied, for example, from a purge adaptor 22) is introduced into one or both of the transporting air and the spraying air and as an adhesive forming the adhesive layer, a water based adhesive is used.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for coating a pile, which is a short fiber, on a substrate surface, an apparatus for performing the coating, and a marbling tone obtained by spraying piles of two or more colors according to the method. It relates to a coating product having a hue. More specifically, the present invention relates to a pile coating method for introducing humidified air into one or both of a pile conveying air and a spraying air, a pile coating apparatus provided with a humidifier, and a pile obtained using the humidified air. Related to coated products.

[0002]

2. Description of the Related Art As a conventional method for processing the surface of a substrate using a pile of short fibers, there is firstly an electrostatic flocking method. In general, the electrostatic flocking method is a technique in which a pile made by cutting fibers in a short length is caused to fly by electrostatic attraction in an electric field formed by applying a high voltage, and an adhesive is applied in advance. It refers to the technique of planting on the surface of a substrate. In this electrostatic flocking method, the flying pile moves in the direction of the lines of electric force, and then penetrates from one end face almost perpendicularly to the surface of the base material. As a result, the pile is placed on the surface of the base material with respect to the surface. It is fixed in an almost upright state. Japanese Patent Application Laid-Open No. 4-293572 discloses that two kinds of curvilinear piles having different hues are charged and dropped on a substrate on which an adhesive layer is formed, and the pile is electrostatically implanted on the substrate. There is disclosed a method for producing a marbled flocking product by an electrostatic flocking method.

[0003] Other methods for processing the surface of a substrate using a pile include Japanese Patent Application Laid-Open Nos. 8-118517 and 8-2.
52489 is mentioned. JP-A-8-118517 discloses a fabric-like interior obtained by forming an adhesive layer on a synthetic resin molded product and spraying a large amount of short fiber pile with a low-pressure spray gun before the adhesive layer is cured. An article is disclosed. Apparatuses used for similar surface processing methods are disclosed in, for example,
No. 252489. In this publication,
A screw feeder is provided below the pile container for accommodating the pile for flocking, an injector for sucking the pile is connected to the outlet of the screw feeder, and the amount of air inflow is adjusted between the outlet and the inlet of the injector. An apparatus for distributing piles for flocking is disclosed in which an air intake port provided with a valve is provided, and a spray gun is connected to the injector via a transfer hose. In the above device, the pile is discharged to the discharge port by rotating a screw feeder provided below the pile container. The discharged pile is introduced into an injector, where it is conveyed via a transfer hose to a spray gun with air sucked from an air intake via a transfer hose and sprayed.

[0004]

However, the electrostatic flocking method has some disadvantages as exemplified below. 1. In the electrostatic flocking method, the pile is almost upright and pierces the surface of the base material, so that the pile is planted without gaps on the surface of the base material, and the number of piles planted per unit area increases, that is, the pile Becomes high density. Also, when trying to implant piles at a low density, it is difficult to obtain a uniform processed surface. Therefore, a large amount of pile is required to obtain a uniform processed surface, and the pile is expensive, so that the processing cost rises.

[0005] 2. In the electrostatic flocking method, there is a case where an attempt is made to produce a coating product having a marbling hue by using a pile of two or more colors (the marbling hue referred to in this specification is a combination of two or more piles. However, it means a state in which each of those colors has such an appearance that it can be distinguished).
In the electrostatic flocking method, when attempting to produce a coating product having a marbling hue, the pile is planted with the pile almost upright on the surface of the base material, so that only the tip surface of the pile of each color is exposed on the surface. It is. This is a state in which the respective colors are mixed in a dot-like manner, and the appearance becomes a mixed color of the respective colors and does not have a good marbling hue. Therefore, in the conventional electrostatic flocking method, as disclosed in JP-A-4-293572, a coated product having an excellent marbling hue is obtained only when a pile having a curved shape is used. Obtainable.

[0006] 3. When piles of two or more colors are used in the electrostatic flocking method, piles of different colors have different coloring and dyeing methods, and therefore generally have different electrical properties, and therefore, even when charged under the same conditions. The different charging states result in different flying powers when electrically attracted in piles of each color. Therefore, in the case where a pile of two or more colors is used to carry out electrostatic flocking to a large number of substrates to continuously produce coating products having a marbling hue, a pile having a large flying power becomes a pile having a small flying power. It is difficult to obtain a coating product of a consistent and constant color in a continuous flocking process.

[0007] 4. JP-A-4-29357, which is a method of processing the surface of a base material by blowing a pile of short fibers by air.
The method disclosed in Japanese Patent Application Laid-Open No. H08-118517 and Japanese Patent Application Laid-Open No. HEI 8-118517 have not been able to solve the problem in the electrostatic flocking method, particularly the problem that occurs when trying to obtain a processed surface having an appropriate pile density. In addition, in these methods, it is difficult to obtain a uniform processed surface as in the case of the electrostatic flocking method, and the pile, which is a short fiber, has the property of being easily agglomerated. Therefore, there is a new problem that a non-uniform work surface is provided when spraying.

[0008] 5. In recent years, the use of recycled plastic has been promoted in the production of various industrial parts, automobile parts, and the like. One of the problems in that case is that the hue of the recycled plastic is limited to a black or gray system. Due to the black to gray hue of recycled plastics, it is almost impossible to color by adding color pigments into the plastic. At present, as a method for improving the appearance and texture of recycled plastics, fabric application or painting is performed, but the surface processing with them is expensive. However, the range of use of recycled plastic is limited by the properties such as low strength and unfavorable hue inherent in recycled products compared to genuine plastic. The range of use is not a product that requires relatively high quality and high performance. Therefore, even if the appearance and texture are improved by applying or applying a fabric, it is rarely used as a high-grade product. Therefore, in order to use the recycled plastic, there is a need for a less expensive method of processing the surface of the base material, which can improve the appearance and feel of the base material surface as well as the case of fabric application or painting.

In order to solve the problems of the prior art as described above, the present inventors disclosed in Japanese Patent Application Laid-Open No. 2000-61365 that the pile was pneumatically conveyed to a charging chamber of an electrostatic spraying gun. Charging the pile in an electrospray gun, and spraying from the spray port of the gun toward the surface of the base material having an adhesive layer on the surface by the spraying air introduced into the conveying air and the heating chamber. A method for coating a pile on a substrate surface, characterized by the following, was proposed. By using this method, many of the above-mentioned problems of the prior art are solved. However, according to the above-mentioned method, for example, in the case where a plurality of substrates are electrostatically flocking using a pile of two or more colors to continuously try to produce a coating product having a marbling hue, The charge state of the pile cannot be freely controlled. Less than,
The reason will be briefly described. Usually, an electrodeposition treatment film is provided on the pile surface in order to impart a desired conductivity to the pile. The conductivity (electric leakage resistance value) of the electrodeposition treatment film is different from the material and thickness of the electrodeposition treatment film. In addition, it greatly varies depending on the water content of the electrodeposition film. Since the electrodeposition film has a certain degree of hygroscopicity, its conductivity (electric leakage resistance value) is affected by humidity in the air. Thus, the charge state of the pile is
Changes due to changes in pile properties such as pile material, size, shape, etc., fluctuations in the material and thickness of the electrodeposition film, changes in pile charging conditions and work conditions such as the flow rate of conveying or spraying air. In addition, the temperature and the humidity of the working environment, for example, the working atmosphere, and particularly the humidity, are greatly affected and greatly change the working environment. Heretofore, there has been no known pile coating method capable of controlling the charge state of the pile in consideration of the influence of such a change in pile properties, a change in work conditions, and a change in work environment. If the charge state of the pile can be controlled freely, the influence of the above-mentioned various factors can be reduced and a high quality pile coating product can be obtained with high production efficiency. There is a strong demand.

[0010] In one aspect of the present invention, a surface having excellent appearance and texture can be obtained even if the number of piles planted per unit area is reduced, that is, the density of piles is reduced. It is another object of the present invention to provide a method for coating a substrate surface. Another object of the present invention is to provide a method for coating a substrate surface, which can provide a surface having an excellent marbling hue even when using a pile having no curved shape. . In another aspect, the present invention provides a high quality pile coating product, for example, a pile coating product having an excellent marbling hue on its surface, even in a case where pile properties, working conditions and working environment fluctuate. It is an object to provide a method of coating a substrate surface, which can be obtained. In another aspect, the present invention provides a method of processing a substrate surface at a low processing cost, which can obtain a surface having the same appearance and texture as that of fabric application or painting, particularly used for recycled plastic. The purpose is also to do.

[0011]

Means for Solving the Problems As a result of diligent research, the present inventors pneumatically conveyed a pile to a charging chamber of an electrostatic spray gun, and charged the pile to an arbitrary charge in the electrostatic spray gun. And, by means of the carrier air and the spraying air introduced into the heating chamber, the spray is sprayed from the spraying port of the gun toward the surface of the base material having an adhesive layer on the surface, and the pile is electrostatically attracted and sprayed. In the method of coating the surface of the base material by both actions of spraying with air, by introducing humidifying air into one or both of the conveying air and the spraying air, the properties of the pile, working conditions and working environment, etc. It has been found that the charge state of the pile can be freely controlled even when the value fluctuates variously. The method of the present invention is an improvement of the pile coating method described in JP-A-2000-61365. We have:
When humidified air is introduced into one or both of the conveying air and the scattered air, if a water-based adhesive is used as an adhesive for forming the adhesive layer, the pile scattered together with the humidified air also has an adhesive layer. Easily attaches to the surface of the substrate, thus, for example, the pile can be coated in an inclined position on the surface of the substrate to obtain a processed surface of the substrate having an excellent appearance and texture even when the pile has a low density When a coating product having a marbling hue is produced by simultaneously using piles of two or more colors, it is possible to continuously obtain a uniform processed surface having an excellent marbling hue. In addition, the present inventors have found that pile lumps do not occur during processing, and have completed the present invention.

Accordingly, the present invention provides a method of conveying a pile by air to a charging chamber of an electrostatic spraying gun, charging the pile in the electrostatic spraying gun, and spraying the conveying air and the spray introduced into the charging chamber. In a pile coating method of coating the pile on the surface of the base material by spraying the air from the spray port of the electrostatic spray gun toward the surface of the base material having an adhesive layer on the surface, the conveying air and The present invention relates to a pile coating method, wherein a humidified air is introduced into one or both of the spraying air and a water-based adhesive is used as an adhesive for forming the adhesive layer. The present invention relates to the above pile coating method, wherein two or more types of humidified air having different relative humidities are used. The present invention also relates to the above pile coating method, wherein a pile having two or more colors is simultaneously used to obtain a surface having a marbling hue.

[0013] The pile has the property of being entangled and agglomerated with each other and very easily forming lumps. Therefore, even if the pile does not form a lump at the outlet of the screw feeder, a lump may be formed when the pile is conveyed to the electrostatic spray gun. Further, if the pile conveyed by air is mixed with the spraying air and then air-conveyed through a long passage to the spraying port of the electrostatic spray gun, lumps are easily formed during the conveyance. When the lumps are formed, it becomes impossible to uniformly scatter the lumps.
Therefore, in order to suppress the formation of lumps, the present invention is characterized in that the mixing of the air-conveyed pile and the spraying air is performed in a passage immediately before the charging chamber of the electrostatic spraying gun. It also relates to the pile coating method. Further, when starting / stopping the spraying, if a pile remains between the tank for storing the pile and the spraying port of the gun for spraying the pile, this contributes to the formation of lumps. Therefore, the present invention further conveys the pile to the electrostatic spray gun through the injector and the air hose by the operation of the screw feeder,
And at the start of the pile sprayed from the electrostatic spray gun, to start the supply of the electrostatic spraying gun of the transport air and spraying air to the start of operation than by time t ₁ earlier of the screw feeder, also stops the pile scatter when, it relates to the above pile coating method, characterized by continuing the supply to the electrostatic spraying gun of the screw feeder of outage time than the time between the conveying air and spraying air t _2.

[0014] The recycled plastic is black or gray
Recycled plastics because of their
Coloring by adding color pigments to
The appearance and texture of the plastic cannot be improved
No. In addition, adhesives conventionally used for electrostatic flocking
Had a transparent or translucent color. But
Use a transparent or translucent adhesive
And especially when coating piles with low density,
The color of the base material becomes transparent, giving a good appearance and texture
It is not possible. Therefore, conventional transparent or translucent colors
TiO for adhesive _TwoMethod of coloring by adding a pigment such as
The adhesion of the adhesive is reduced and the pile is no longer
It becomes unsuitable for coating. There
In the pile coating method of the present invention,
Use a new adhesive that does not cause a decrease in adhesion even when color is applied.
To use. Therefore, in the pile coating method of the present invention,
The adhesive must have the same hue as the pile
The substrate hue is concealed by the colored adhesive
Used when coating piles at low density.
Excellent appearance and texture regardless of the hue of the substrate
Can be. Use a mat type adhesive
A similar effect can also be obtained. Therefore,
The present invention relates to a pile of adhesive as an adhesive for forming an adhesive layer.
Based on high concealment paints with the same hue as the hue
Water-based adhesive or matte type high concealment paint
The use of a water-based adhesive and
It also relates to the pile coating method.

When an adhesive containing a flexible component is used in the pile coating method of the present invention, the adhesive itself has softness and great elasticity, and the pile is implanted in a flexible adhesive layer. The work surface coated with the pile is soft and gives an excellent tactile sensation as if it were a suede. Accordingly, the present invention also relates to the above-mentioned pile coating method, characterized by using a water-based adhesive based on a highly concealable paint containing a flexible component.

As the aqueous adhesive used in the present invention, for example, it is preferable to use an aqueous adhesive based on a synthetic resin emulsion. Therefore, the present invention also relates to the above-mentioned pile coating method, wherein an aqueous adhesive based on a synthetic resin emulsion is used as an adhesive for forming an adhesive layer.

Specific examples of the synthetic resin emulsion include, for example, vinyl acetate resin emulsion, vinyl acetate copolymer resin emulsion (for example, ethylene-vinyl acetate copolymer resin emulsion), acrylate polymer resin emulsion, and acrylate ester. Copolymer resin emulsion (for example, styrene-acrylate copolymer resin emulsion), epoxy resin emulsion,
Urethane resin emulsion, polyester resin emulsion, acrylic-silicone resin emulsion,
One or more synthetic resin emulsions selected from the group consisting of fluororesin emulsions and chlorine resin emulsions. The present invention also relates to the above-mentioned pile coating method, characterized by using an adhesive based on these synthetic resin emulsions.

As the water-based adhesive used in the present invention, for example, it is preferable to use an adhesive based on a water-soluble resin. Therefore, the present invention also relates to the above pile coating method, wherein a water-based adhesive based on a water-soluble resin is used as the adhesive for forming the adhesive layer.

Specific examples of the water-soluble resin include, for example, a water-soluble alkyd resin, a water-soluble-modified alkyd resin, a water-soluble polyester resin, a water-soluble-modified polyester resin, a water-soluble acrylic resin, a water-soluble-modified acrylic resin, and a water-soluble alkyd resin. One or more selected from the group consisting of a water soluble epoxy resin, a water soluble modified epoxy resin, a water soluble melamine resin, a water soluble modified melamine resin, a water soluble chlorinated olefin resin and a water soluble modified chlorinated olefin resin. Many water-soluble resins. The present invention also relates to the above-mentioned pile coating method, characterized by using an adhesive based on these water-soluble resins.

According to the present invention, a screw feeder is provided at a lower portion of a pile tank for storing piles, an injector is connected to an outlet of the screw feeder, and the injector and the charging chamber of the electrostatic spray gun are connected by a pile transfer hose. Communicating, and connecting a supply air supply hose between an air supply source and the injector, and connecting a scatter air supply hose between the air supply source and the pile transfer hose or the power supply chamber, The present invention also relates to a pile coating apparatus for coating a pile on a substrate surface, comprising a humidifier for introducing humidified air to one or both of the conveying air and the spraying air.
As the humidifier, various types of humidifiers can be used. Specifically, the humidifier may be, for example, one or more humidifiers selected from the group consisting of a heated humidifier, an ultrasonic humidifier, and a bubbling humidifier. Accordingly, the present invention provides the pile as described above, wherein the humidifier is one or more humidifiers selected from the group consisting of a heated humidifier, an ultrasonic humidifier and a bubbling humidifier. It also relates to coating equipment. The present invention further relates to a pile-coated product having a marbling hue, which is obtained by spraying a pile of two or more colors having a linear shape or a curved shape according to the pile coating method of the present invention.

In the pile coating method of the present invention, the pile is inclined at a certain angle with respect to the substrate surface by using both the electrostatic suction force and the spraying of the spray air for the coating. Can be coated in different positions. Therefore, a pile coated in an inclined position covers a larger area of the substrate surface than a pile coated in an upright state. Therefore, according to the pile coating method of the present invention, it is possible to obtain a uniform processed surface with a smaller amount of pile per unit area as compared with the case of the electrostatic flocking method in which the pile is planted with the pile almost upright. Thus, the pile coating method of the present invention is a processing method in which the pile has a low density and is economically excellent. Further, in the pile coating method of the present invention, both the action of electrostatic suction force and the action of spraying by spraying air are used for coating as compared with the method of using only the action of spraying by air for coating. Thereby, uniform spraying can be performed over a wider range. Therefore, when the pile coating method of the present invention is used, the efficiency of coating the surface of the base material becomes large, and the coating operation can be saved. Furthermore, in the pile coating method of the present invention, the humidified air is introduced into one or both of the conveying air and the spraying air, and a water-based adhesive is used as an adhesive for forming an adhesive layer. As described above, even when various factors in the pile coating vary, the pile can always be stably coated on the substrate surface without being affected by these factors.

[0022]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the pile coating method of the present invention, a method of introducing humidified air into one or both of the conveying air and the spraying air may be appropriately selected. That is, by introducing humidified air having an appropriate relative humidity to the base air of the conveying air or the spraying air, the conveying air or the spraying air having a predetermined relative humidity may be adjusted in advance,
Alternatively, humidified air having an appropriate relative humidity may be introduced into any part of the line of the conveying air or the spraying air in the pile coating apparatus of the present invention. The humidity of the humidified air used in the pile coating method of the present invention may vary widely within a practically usable range. For example, relative humidity 1
99%, preferably 10-90%, more preferably 20%
Humid air of ~ 80%, most preferably 30-70% can be used. Two or more types of humidified air having different relative humidities may be used in combination. When two or more types of humidified air having different relative humidities are used in combination, the relative humidity, flow rate, introduction position, and the like are controlled by, for example, a personal computer or manually to make the pile conductive (electrical leakage). The resistance (resistance value) can be changed in a large range or a small range, and therefore, the conductivity (electric leakage resistance value) of the pile can be freely controlled.

In the pile coating method of the present invention,
The pile is discharged by a screw feeder provided at the lower part of the pile tank where the pile is stored, sent to an injector connected to the discharge port, air-conveyed from the injector to a power supply chamber of an electrostatic spraying gun, and transferred to a power supply chamber. Charged
Then, the air is sprayed from the spray port of the gun to the surface of the base material having an adhesive layer on the surface by the spray air introduced into the heating chamber.

The pile tank for storing the pile is provided with a screw feeder for discharging the pile at a lower portion thereof. The pile is quantitatively discharged from the pile tank by rotating the screw feeder. Also, in order to make the amount of pile per unit volume in the tank uniform,
It is preferable to provide a wire mesh screen over the entire cross section of the pile tank and a vibrator for vibrating the screen. By installing and operating the auger in the tank, the distribution of piles around the screw feeder can be made uniform, especially when pile coating is performed using two or more piles. The humidified air may be introduced from, for example, an air intake port at the top of the pile tank.

The pile discharged by the screw feeder is sent to an injector connected to a discharge port,
It is mixed with the transport air and transported by air to the electrostatic spray gun. By transporting the pile by air, the pile can be transported to the electrostatic spray gun without causing pile agglomeration. Further, by adjusting the rotation speed of the screw feeder or the pressure of the conveying air, the amount of the pile conveyed to the electrostatic spraying gun can be controlled. That is, if the speed of rotation of the screw feeder is increased or the pressure of the conveying air is increased, the amount of pile conveyed per time increases, and the speed of rotation of the screw feeder is reduced or the pressure of the conveying air is reduced. The amount of pile transported per hour is reduced. In addition, piles are very likely to be lump, and when transported to an electrostatic spray gun, if the transport air becomes turbulent, the probability of agglomeration and lump increase,
Preferably, the conveying air is laminar.

The electrostatic spray gun used in the present invention is, for example, the one shown in FIG. The electrostatic spray gun is provided with a device for positively or negatively charging the pile,
Further, a hose for conveying the pile from the injector is connected to the power supply chamber, and a hose for supplying the spraying air is connected to a hose for conveying the pile or the power supply chamber. The humidified air may be introduced into, for example, a hose for carrying air through, for example, a purge adapter. As a device for charging the pile,
For example, there is an apparatus for charging by corona discharge. The electrostatic spraying gun shown in FIG. 2A is provided with a charging chamber which is an area for charging the pile, and has a corona pin at the center thereof, to which a negative high voltage is applied. When the applied voltage gradually increases, an ionic current (corona current) starts to flow through the space from the corona pin toward the base material at a certain voltage (corona start voltage) or more, and a point-like corona point appears at the tip of the corona pin. When the pile is introduced into the electrostatic spray gun in this state, the pile is immediately negatively charged. The reason why the negative corona is used here is that the corona start voltage is lower than in the case of the positive corona, and the probability of transition to spark is low. Examples of the electrostatic spray gun used in the present invention include, for example, an electrostatic spray coating gun manufactured by Nordson Corporation, which is usually used for powder coating. The applied voltage at the time of spraying is in the range of 10 to 100 kV, preferably 40 to 100 kV.

The charged pile is mixed with the spray air and sprayed on the surface of the base material by both electrostatic suction and spraying by the spray air. In order for an electrostatic attraction to act on the charged pile toward the substrate, the substrate must be grounded. Whereas the conveying air is used to convey the pile to the electrostatic spray gun in a predetermined amount without agglomeration, the sparging air is used for efficiently obtaining a more uniform working surface and for the coated pile. It is also used to control the angle of tilt. By using the scatter air, the range where the pile is scattered can be expanded as compared with the case where the scatter air is not used.
The blast air is preferably mixed from a direction perpendicular to the flow of the carrier air. Further, from the viewpoint of preventing pile agglomeration, it is preferable to mix scattered air so as not to generate turbulence.

In the pile coating method of the present invention, the pile is coated at an angle with respect to the substrate surface at an angle, and this angle controls the voltage used to charge the pile or the pressure of the spray air. It can be controlled by adjusting. That is, if the voltage for charging the pile is increased or the pressure of the spraying air is reduced, the pile is coated in a more upright state, and the voltage for charging the pile is lowered or the pressure of the spraying air is increased. The pile will then be coated in a more inclined position. The pressure of the spraying air is selected depending on the pressure of the conveying air, the amount of the pile to be conveyed, and the like so as to obtain a desired uniform processing surface as wide as possible. In the present invention, the pressures of the conveying air and the spraying air are both in a range of ^{2 to} 5 kg / cm ² .

The pile, which is a short fiber, may be any of natural, regenerated (semi-synthetic) or synthetic fiber as the type of fiber, but aromatic fibers such as Kevlar, Nomex, and Co. Nex, etc.),
Other polyamide fibers (6-nylon, 6,6-nylon, 4,6-nylon, etc.), regular polyester fibers, basic dyeable polyester fibers, acrylic fibers, vinylon fibers, regenerated cellulose fibers (rayon),
Examples include wool fiber, cotton fiber, hemp fiber, polyolefin fiber such as polyethylene fiber and polypropylene fiber, collagen fiber, ceramic fiber, carbon fiber, potassium titanate fiber and the like. However, high-quality and high-textile fibers called new synthetic fibers, in particular, silky, peach, rayon or wool-like new synthetic fibers may be used. The short fibers may be undyed or dyed, or may be raw material colored (colored by mixing a pigment or the like at the spinning stage), that is, spun fibers. By dyeing the fibers or coloring the raw materials, a pile of various colors can be obtained by combining the inherent hue of the short fiber, the hue of the electrodeposition film, and the hue of the dye. As the dye to be used, although it varies depending on the fiber, an acid dye, a metal complex dye such as a chromium complex dye, a disperse dye, a cationic dye, a reactive dye and the like can be mentioned. Also,
It is also possible to use piles of two or more colors having different hues in combination. As the pile in the present invention, fineness;
0.08 to 65d, preferably 1 to 5d, pile length;
The above short fibers having a size of 0.1 to 6.0 mm are preferred.

The pile of the present invention may have a short fiber table if necessary.
The surface is substantially covered with the electrodeposition film. Electrodeposition
The barrier may be made of, for example, inorganic salts, surfactants or organic silicon.
It is formed by coating or impregnating with a nitrogen compound. above
As inorganic salts, surfactants or organosilicon compounds
The required conductivity of the short fiber
What can be applied to the surface applies. Inorganic salts
As sodium chloride (NaCl), barium chloride
(BaCl _Two), Magnesium chloride (MgCl_Two), Sulfuric acid
Magnesium acid salt (MgSO_Four), Sodium silicate (Na_TwoS
iO_Three), Sodium carbonate (Na_TwoCO_Three), Sodium sulfate
((Na_TwoSO_Four) Etc. are used. As a surfactant
The anionic surfactant, nonionic surfactant,
Amphoteric surfactants, cationic surfactants, etc. are used
You. Furthermore, as the organosilicon compound, colloidal silicon is used.
Mosquitoes are used. The above-mentioned electrodeposition treatment film converts the short fibers to inorganic
Solutions of salts, surfactants or organosilicon compounds or
By immersing in these mixed solutions, it can be formed
it can. In addition, the thickness of the electrodeposition film is
Basically, it is optional as long as it exhibits appropriate separation
You.

In general, the pile has an electric leakage resistance value of 10 ⁴ to 10 ⁹ Ω / cm, more preferably 10 ⁴ to 10 ⁸ Ω / cm during electrostatic flocking. However, it is said that it is suitable as a pile and has sufficient flying power. Therefore, even in the pile of the present invention, the conditions of the electrodeposition process are set so as to have an electric leakage resistance value within the above range. Further, the pile of the present invention may have a linear shape, but may also have a crimped or curled shape by crimping a curved shape, for example, a short fiber.

The material of the substrate on which the pile coating of the present invention is performed may be an ABS resin, a synthetic resin such as a polyolefin such as polypropylene (PP) or polyethylene (PE), wood, or a woven fabric. In addition, a recycled product, whose use has recently attracted attention, mainly a recycled polypropylene product, can also be used as the base material. The substrate may be formed into a required shape. In the pile coating method of the present invention, since the pile is scattered not only by electrostatic attraction but also by scatter air, a uniform processed surface can be obtained even when the base material has irregularities.

In the present invention, the water-based adhesive used for forming the adhesive layer on the surface of the substrate may be a highly opaque paint such as an epoxy-based, melamine-based, acrylic-based, polyester-based, urethane-based or chlorinated polyolefin-based paint. And a water-based adhesive based on the same. The adhesive is selected from various resins as a vehicle, in consideration of elongation, softness, adhesion, light resistance, curability, etc., and suitable for the intended planned adhesive performance. In addition, in addition to the above-mentioned vehicle and water as a solvent, a coloring agent, a desiccant, an anti-separation agent, a thickening agent, a flattening agent, an anti-sagging agent, an ultraviolet absorber, a curing agent, and the like are required for the adhesive. Any selection can be used.

When an adhesive containing a flexible component is used in the pile coating method of the present invention, the adhesive itself has softness and great elasticity, and the pile is implanted in the flexible adhesive layer. The work surface coated with the pile is soft and gives an excellent tactile sensation as if it were a suede. Such an adhesive is, for example, an aqueous adhesive based on a urethane resin or a polyol-modified chlorinated polyolefin resin. For example, as the urethane resin-based water-based adhesive, an acrylic-modified urethane resin-based, polyester-modified urethane-resin-based, silicon-modified urethane-resin-based adhesive, or the like can be used. Still other advantages of using a urethane resin-based water-based adhesive are that the resulting processed surface has excellent abrasion, solvent and light resistance, and is less susceptible to scratching. Among these, it is considered that the reason why the wear resistance is improved is that the pile is hard to come off due to friction because the adhesive has softness and great elasticity. The thickness of the adhesive layer is usually 10 to 100 μm in a dry state, preferably 20 to 30 μm.
m. The method for forming the adhesive layer is appropriately selected from brush coating, flow coating, roll coating, spray coating, and the like.

[0035]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows an apparatus for performing the pile coating of the present invention. The pile, which is the short fiber to be coated, is stored in the pile tank 10. A screw feeder 11 is provided at a lower portion of the pile tank so as to cross the pile tank, and an outlet 14 for a pile by the screw feeder is provided on a side surface of the pile tank. A screen 12 is stretched over the entire section of the pile tank above the pile tank, and a vibrator 13 is attached to the center of the screen 12. An auger 16 is provided around the screw feeder 11 coaxially with the screw feeder 11, and the screw feeder 11 and the auger 16 are provided.
A motor 15 is provided outside the pile tank 10 to rotate the pile tank 10. An injector 17 is connected below the outlet 14, and the injector 17 has an air supply source 1.
A supply hose for sending air from 8 is connected.
Further, a pile transfer hose 19 is connected to the injector 17, and the pile transfer hose 19 is connected to an electrostatic spray gun 20 via a purge adapter 22. A spraying air supply hose 21 from the air supply source 18 is also connected to the electrostatic spraying gun 20 via a purge adapter 22. In this embodiment, the electrostatic spray gun is used for hand-held spraying. However, it is also possible to mount the electrostatic spray gun on a robot arm and perform pile coating under computer control.

In the apparatus shown in FIG. 1, the pile which is a short fiber is discharged to the discharge port 14 by rotating the screw feeder 11 by the motor 15. Also, the screen 12 provided on the upper part of the pile tank 10 is
By vibrating with the attached vibrator 13, the amount of pile per unit volume can be made uniform, and a constant amount of pile is always discharged to the discharge port 14 by the screw feeder 11.
Further, by providing the auger 16 around the screw feeder 11 and stirring the pile, the distribution of the pile around the screw feeder 11 can be made uniform especially when two or more piles are used in combination.

The pile discharged from the discharge port 14 is supplied to an injector 17 connected below the pile. In the injector 17, the pile is mixed with the carrier air supplied from the air supply source 18, passes through the pile carrier hose 19, and passes through the purge adapter 22 through the electrostatic spray gun 20.
Is transported by air to the heating chamber 25. On the other hand, the spraying air is supplied from the controller 18 through the spraying air supply hose 21 to the power supply chamber 25 of the electrostatic spraying gun 20 via the purge adapter 22.

When mixing the pile conveyed by the pile conveying hose 19 with the scatter air supplied by the scatter air supply hose 21, the mixing is performed by the electrostatic spray gun 2.
It is preferable to perform the process in the passage immediately before the power supply chamber 25 provided in 0 from the viewpoint of suppressing the formation of pile lump. That is, the arrangement of the transfer hose 19, the spraying air supply hose 21, and the purge adapter 22 in the electrostatic spraying gun 20 shown in FIG. 2A is better than the mixing in the arrangement shown in FIG. In addition, the formation of pile lumps can be significantly suppressed. Thus, the pile mixed with the spray air was charged at a desired applied voltage in the power supply chamber 25 of the electrostatic spray gun 20, and was grounded by the action of both the electrostatic suction force and the spray air. Spread on the substrate.

FIG. 3 is a schematic view showing an example of supplying humidified air to a pile tank in the method of the present invention.
In this example, when the pile 31 is supplied from the pile supply device 30 into the pile tank 10 and the pile 31 is transferred to the electrostatic spray gun 20 shown in FIG. 1 by the injector pump 32, a humidifier (for example, a heating type, The humidified air 34 adjusted to an appropriate humidity by an ultrasonic type or a bubbling type humidifier) is supplied from the air suction port 33 to the pile tank 10. The pile 31 is appropriately humidified by being brought into contact with the humidified air 34 in the pile tank 10, and is adjusted so as to have a predetermined conductivity (electric leakage resistance value) (one-step control method). Next, the pile 31 is transferred to the electrostatic spray gun 20 by the compressed air 35 introduced into the injector pump 32.

FIG. 4 is a perspective view showing an example of supplying humidified air to the electrostatic spray gun in the method of the present invention. In this example, humidified air is supplied to the purge adapter 22 through the spraying air supply hose 21 and the electrostatic spraying gun 20 is supplied.
The pile is humidified inside (one-step control method).

The humidifying air supply methods shown in FIGS. 3 and 4 may be used in combination. In this case, for example, by making the humidity of the humidified air supplied to the pile tank 10 different from the humidity of the humidified air supplied to the purge adapter 22, the conductivity (electric leakage resistance value) of the pile 31 can be more finely controlled. (Two-stage control method). Specifically, for example, first, the conductivity (electric leakage resistance value) of the pile 31 is preliminarily set to a reference value by humidified air supplied to the pile tank 10 (adjusted to a predetermined humidity A in advance), Next, the conductivity (electric leakage resistance value) of the pile 31 may be changed to a value around the reference value by humidifying air (adjusted to a predetermined humidity B in advance) supplied to the purge adapter 22. With the same concept as the two-stage control method, a multi-stage control method with three or more stages may be used for the humidified air.
For example, if the humidity of the compressed air 35 introduced into the injector pump 32 is also adjusted, a three-stage control method for humidified air can be performed.

When the pile spraying from the electrostatic spraying gun is started, the time t starts from the start of the operation of the screw feeder.
Previously only _1, starting the supply to the electrostatic spraying gun of the transport air and spraying air, also during the stopping of the pile spraying, during shut-down than the time t ₂ of the screw feeder, the conveying air and spraying air By continuing the supply to the electrostatic spraying gun, the pile remaining in the system can be exhausted by the air to terminate the spraying. Can be suppressed. A switch provided on the electrostatic spray gun 20;
The operation of the screw feeder and the on / off relationship for each of the supply of the conveying air and the spraying air are shown with respect to the passage of time in FIG. Here, times t ₁ and t ₂
Should be long enough to discharge the pile remaining in the system with the conveying air and the spraying air.

The angle between the pile and the substrate surface can be freely controlled by the voltage used for charging the pile, the pressure of the spraying air, and the electrical properties of the pile to be sprayed. That is, if the voltage used to charge the pile is increased or the pressure of the spray air is increased,
The pile coating method of the present invention is closer to the electrostatic flocking method, and the pile is coated in a more upright state with respect to the substrate surface. In contrast, lowering the voltage used to charge the pile or increasing the pressure of the blast air results in the pile being coated in a more inclined position with respect to the substrate surface.

Next, the processing state of the substrate surface obtained by the pile coating method of the present invention will be described with reference to the drawings.

FIG. 6 is a plan view showing a processed state of a substrate surface obtained by the pile coating method of the present invention. FIG. 7 (a) shows a cross-sectional view of the substrate surface obtained by the electrostatic flocking method, and FIGS. 7 (b) -1 to (b) -4 show the pile coating method of the present invention. FIG. 7 shows a cross-sectional view of the obtained substrate surface, and FIG.
FIG. 2 is a cross-sectional view of a substrate surface obtained by blowing a pile with air. FIG. 8 is a sectional view of a substrate surface obtained by the pile coating method of the present invention using two-color piles.

In FIG. 6, since the pile 42 is sprayed on the surface of the base material 41 by spraying air, the pile 42 is fixed to the surface of the base material 41 in a posture inclined at random from a direction perpendicular to the surface of the base material 41. I have. Therefore, mainly the side surface of the pile 42 is exposed on the surface, not the tip end surface of the pile 42.

FIG. 7 (a), (b) -1 to (b) -4
As shown in (c) and (c), the surface of the substrate 41 has an adhesive layer 4
3 are formed, and the pile 42 is fixed to the adhesive layer. The pile 42a fixed to the surface of the substrate by the conventional electrostatic flocking method shown in FIG. 7A is substantially upright with respect to the surface of the substrate. Therefore, the piles 42a are fixed to the surface of the base material at high density, and the number of piles fixed per unit area of the base material increases. In contrast, FIG.
The pile 42b fixed to the substrate surface by the pile coating method of the present invention represented by (b) -1 to (b) -4
Never stands upright due to the action of the spray air,
It is coated at a certain angle to the substrate surface. Therefore, the pile fixed by the pile coating method of the present invention covers a larger area of the base material surface per pile than the pile fixed by the electrostatic flocking method. Therefore, in the pile coating method of the present invention, the number of piles fixed per unit area of the base material is significantly reduced as compared with the electrostatic flocking method, and the surface can be processed at a low density. Further, when the adhesive used for the adhesive layer is a hue of the same system as the hue of the pile or a mat type, even when pile coating is performed at a low density, the colors of the base material 41 and the adhesive layer 43 are changed. Good finish without noticeable. The pile fixed to the base material surface by blowing the pile shown in FIG. 7 (c) with air is similar to the pile 42b shown in FIG. 7 (b) -1 to (b) -4. Are fixed at an angle to. However, there is a large difference in the fixed state of the pile between the pile fixed by the pile coating method of the present invention and the pile blown only by air. In the pile coating method of the present invention, as shown in FIGS. 7 (b) -1 to (b) -4, by using both the action of electrostatic suction and the action of spraying with scattered air. The pile is pierced from one end face into the substrate surface and is fixed at an almost constant angle with the substrate surface. On the other hand, in the case of a pile blown only by air, since there is no action of electrostatic attraction, both end faces may pierce the substrate surface as shown in FIG. There is a pile 42c fixed in a U-shape and a pile 42d fixed lying in parallel with the surface of the base material, and a large variation occurs in the angle formed by the pile with the surface of the base material. The difference between the two pile fixing states is reflected in the tactile sensation of the processed surface, and the processed surface obtained by the pile coating method of the present invention is more static than the processed surface obtained by the method of blowing the pile only with air. It is a cause of having a good tactile sensation close to the electro-flocking method. Also,
In the pile coating method of the present invention, by using humidified air, the pile can be suitably humidified and the conductivity (electric leakage resistance value) of the pile can be freely controlled. As shown in FIG.
It is possible to adjust the pile implantation state in a wide range from the pile implantation state of FIG. 7 to the pile implantation state of FIG.

In FIG. 8, the substrate surface is coated using a pile having two hues, a white pile 44a and a black pile 44b. The piles of the two colors are coated with each of the piles inclined with respect to the surface of the base material, exposing the side surface, not the tip surface, of the surface. Therefore, the area where the pile is exposed on the surface increases as compared with the electrostatic flocking method, the contrast between different colors becomes clear, and excellent marbling tone is obtained. The pile used at this time may have a linear shape or may have a curved shape. Also, unlike the electrostatic flocking method, the charged pile is forcibly sprayed on the base material by the spraying air. Therefore, even if two or more piles are used and each pile has a different electrical property, it can be specified. Types of piles are not coated preferentially, and each pile can be coated uniformly and continuously. Further, even when the properties of two or more piles change in various ways, the conductivity of the pile (electric leakage resistance value) can be controlled by using the humidified air, so that a product of stable quality is always obtained. be able to.

<Pile Coating on Plastics> In order to perform pile coating on the surface of various plastics as a base material, an aqueous system suitably mixed according to the type of plastic and the use of the obtained product is used. It is necessary to use an adhesive. Hereinafter, an example of a combination of a plastic and an aqueous adhesive (synthetic resin emulsion) will be described. Example 1: Pile coating on polyvinyl chloride substrate Using a water-based adhesive based on a synthetic resin emulsion containing a high hiding paint of gray hue and having the following compositions a) to d), respectively. An adhesive layer is formed on the surface of a substrate made of polyvinyl chloride and has a fineness of 2 denier, 0.6 m
A pile having a m-length and a gray hue was coated according to the pile coating method of the present invention to obtain a product having a pile-coated work surface. A) Ethylene-vinyl acetate copolymer resin emulsion 100 parts Melamine resin 5 parts Catalyst 0.8 part Nonionic activator Small amount White coloring pigment (rutile titanium oxide) 40 parts Black coloring pigment (carbon-based) 1 part b) Ethylene- Vinyl acetate copolymer resin emulsion 100 parts Cyclohexanone or dichlorobenzene 5 parts Melamine resin 5 parts Catalyst 0.8 part White coloring pigment (rutile titanium oxide) 40 parts Black coloring pigment (carbon-based) 1 part c) Ethylene-vinyl acetate Copolymer resin emulsion (solvent-containing) 100 parts Synthetic rubber emulsion 20-30 parts Melamine resin 5-7 parts Catalyst 0.8-1.0 parts White coloring pigment (rutile titanium oxide) 40 parts Black coloring pigment (carbon-based) 1) d) Self-crosslinking acrylic resin emulsion ammonia Water Appropriate amount Melamine resin 5-7 parts Catalyst 0.8-1.0 parts Nonionic activator Small amount White coloring pigment (rutile titanium oxide) 40 parts Black coloring pigment (carbon type) 1 part Pile-coated processed surface is excellent It had a good appearance and texture.

Example 2: Pile coating on a polystyrene or ABS resin base material An aqueous adhesive based on a synthetic resin emulsion containing a high hiding paint having a gray hue and having the following compositions a) and b) was prepared. Each is used to form an adhesive layer on the surface of a substrate made of polystyrene or ABS resin, and to coat a pile having a fineness of 2 denier, a length of 0.6 mm and a gray hue according to the pile coating method of the present invention. Thus, a product having a pile-coated processed surface was obtained. A) Ethylene-vinyl acetate copolymer resin emulsion 100 parts Highly condensed urea resin 5 parts Ammonium chloride (10% solution) 2 parts White coloring pigment (rutile titanium oxide) 30 parts Black coloring pigment (carbon-based) 1 part b) Acetic acid Vinyl resin emulsion 100 parts Toluene or xylol 10 parts Highly condensed urea resin 10 parts Ammonium chloride (10% solution) 2 parts White color pigment (rutile type titanium oxide) 30 parts Black color pigment (carbon) 1 part Pile-coated processing The surface had an excellent appearance and texture.

Example 3 Pile Coating on Foamed Product Base Polyurethane foam, polyvinyl chloride foam, polystyrene foam, etc. are in a foamed state and have relatively good adhesion (physical adhesion). An acrylic ester (self-crosslinking type) resin emulsion is mainly used in many cases. For the open-celled body, an adhesive is applied after the filling process is performed. The filling process is performed by spraying or brushing the same kind of adhesive. Using a water-based adhesive based on a synthetic resin emulsion containing a high hiding paint having a gray hue and having the following composition a), on a substrate surface made of polyurethane foam, polyvinyl chloride foam or polystyrene foam. A pile having a denier of 2 denier, a length of 0.6 mm and a gray hue was coated according to the pile coating method of the present invention to obtain a product having a pile-coated processed surface. A) Acrylic ester (self-crosslinking) resin emulsion 100 parts Melamine resin 10 parts Catalyst 2 parts Ammonia water Appropriate amount White coloring pigment (rutile titanium oxide) 30 parts Black coloring pigment (carbon-based) 1 part

<Pile Coating to Metals> In order to perform pile coating on the surface of various metals as a base material, it is necessary to use a water-based compound suitably mixed depending on the type of metal and the use of the obtained product. It is necessary to use an adhesive. An example of a combination of a metal and an aqueous adhesive (synthetic resin emulsion) will be described below. Example 4: Pile coating on a metal product substrate Using a water-based adhesive based on a synthetic resin emulsion containing a high hiding paint having a gray hue and having the following compositions a) and b), respectively: An adhesive layer is formed on the surface of a substrate made of a metal product (eg, an aluminum product, a steel product, etc.), and a pile having a fineness of 2 denier, a length of 0.6 mm, and a gray hue is applied to the pile coating of the present invention. According to the method, a product having a pile-coated working surface was obtained. A) Vinyl acetate resin emulsion 100 parts Sodium benzoate * 0.5 part Sodium nitrite ** 0.1 part Melamine resin ** 8-10 parts Catalyst 1-2 parts White coloring pigment (rutile type titanium oxide) 25 parts Black coloring pigment (carbon type) 1 part *, ** Mix as rust inhibitor. *** Applicable to water-soluble phenol resin and urea resin. B) Vinyl acetate resin emulsion 100 parts Sodium carbonate (neutralizing agent) Appropriate amount Urea resin (methylol urea) 5 parts Catalyst 0.7 part White coloring pigment (rutile type titanium oxide) 25 parts Black coloring pigment (carbon-based) 1 part In the case of a substrate having low adhesion strength, an appropriate primer is used as a base coat for an emulsion paint.

Example 5: Formulation example when water-soluble resin is used as water-based adhesive A water-soluble resin and a suitable additive are appropriately mixed at a predetermined ratio. An example is shown below. B) Color pigment 25 parts Water-soluble acrylic resin 40 parts Water-soluble melamine resin 11 parts Antifoaming agent Small amount Leveling agent Small amount Anti-sagging agent Suitable amount Water Suitable amount

Example 6: Comparison of pile weight between the electrostatic flocking method and the pile coating method Affixed to the surface between the processing surface planted by the electrostatic flocking method and the processing surface coated by the pile coating method of the present invention. In order to compare the density of the piles, the amount of the pile fixed per unit area of the base material was calculated based on the pile basis weight (g / g).
m ² ) and was a measure of the pile density. In the pile coating method of the present invention, a relative humidity of 30 to
70% humidified air was used in the manner shown in FIG. The samples for which the basis weight is measured have the same appearance and texture produced by using the same conditions except for the pile used in the electrostatic flocking method and the present pile coating method.
Regarding the pile, several piles of varying fineness and length were used, and both a pile having a linear shape and a bending pile were used. Bending pile refers to introducing a linear fiber into the meshing portion of two gears meshing with each other, forming a folded fiber having a waveform by the meshing, and cutting the fiber to a predetermined length in an extended state. Is a pile having no linear shape. The results obtained are shown in Table 1 below. A high basis weight indicates that the pile is fixed at a high density, and a low basis weight indicates that the pile is fixed at a low density.

[0055] ^* ) B represents a bending pile. The results shown in Table 1 show that, no matter what pile is used, the basis weight by the pile coating method is about 40% of the basis weight by the electrostatic flocking method, and the pile coating method of the present invention is less than half that of the electrostatic flocking method. Means that a processed surface having the same appearance and texture can be obtained at a low density.

Example 7: Abrasion Resistance Test of Worked Surfaces In the coating of piles, the adhesion was evaluated in order to compare the flexibility of the adhesive used in the conventional method with the aqueous adhesive used in the method of the invention. The abrasion resistance of the processed surface, which results from the flexibility of the agent, was compared for both adhesives. In the pile coating method of the present invention, humidified air having a relative humidity of 30 to 70% was used in the method shown in FIG. The samples tested were substrates that were pile-coated using an acrylic adhesive (conventional method), a polyester adhesive (conventional method) and an aqueous adhesive (method of the present invention, urethane resin-based synthetic resin emulsion). The surface was prepared under the same conditions except for the type of the adhesive. The wear resistance test was performed according to JIS K5400-199.
0 Paint general test method, According to the test method for resistance of the coating film, 8.9 abrasion resistance test, the number of rotations was 1000.
The test was performed under the conditions of a wear wheel CS-17 and a load of 1000 g. The results obtained are shown in FIG. A large amount of abrasion indicates poor abrasion resistance and therefore poor flexibility, and a small amount of abrasion indicates good abrasion resistance and thus excellent flexibility.

The results shown in FIG. 9 show that the surface of the substrate using the water-based adhesive of the present invention has much less wear and good abrasion as compared with those using the conventional adhesive. It represents that. Thus, the processed surface obtained according to the pile coating method of the present invention will be soft and have an excellent touch as if it were a suede due to the nature of both the pile and the adhesive.

[0058]

According to the pile coating method of the present invention, by introducing humidified air into one or both of the conveying air and the spraying air, the pile is humidified and the specific resistance of the pile is reduced. The chargeability increases, and the pile coating efficiency and pile pile-up property are improved. In the pile coating method of the present invention,
It is possible to freely control the conductivity (electric leakage resistance value) of the pile, and by using a water-based adhesive as an adhesive for forming the adhesive layer, the humidified pile can be used as a base material. Can be securely and firmly fixed.
In addition, with respect to the pile coating method of the present invention, equipment that can already use humidified air, such as an automobile coating equipment, can be used at present. That is, in such an environment, the pile coating method of the present invention requires little new capital investment, and the experience and knowledge of the operation of the existing humidified air equipment can be applied almost as it is. And can be implemented immediately with existing equipment and workers. Therefore, the pile coating method of the present invention has various advantages as described below, and the use of the pile coating method of the present invention makes it possible to use the pile coating method without being affected by changes in working conditions and working environments. It is possible to always produce a high quality pile coating product whose properties can be changed over a wide range in a stable quality.

When the pile is coated on the substrate according to the pile coating method of the present invention, the pile fixed on the surface of the substrate penetrates the adhesive layer from one end face by the action of electrostatic attraction, and the air sprayed. By the action, it is tilted with respect to the substrate surface and fixed at a certain angle. As a result, each pile covers a larger area of the substrate surface than in the case where the pile is upright, so that the number of piles fixed per substrate area is reduced, that is, the density is reduced. can do. This is clear from the results shown in Table 1 of Example 6. Therefore, excellent surface processing can be achieved with a smaller number of piles, and the processing cost can be significantly reduced.

When an attempt is made to produce a coating product having a marbling hue by simultaneously using piles of two or more colors, the pile coating method of the present invention employs a pile in which the pile is inclined with respect to the surface of the substrate at a certain angle. Therefore, the side surfaces of the piles of each color are mainly exposed on the surface. As a result, even when a straight pile is used, the area exposed on the surface of the base material is large, and therefore, the marbled preparation produced by using the pile of two or more colors by the pile coating method of the present invention is: The contrast between the colors becomes clear, and a surface with an excellent marbling hue can be obtained even when a curved pile is not used. Further, in the pile coating method of the present invention, since the charged pile is forcibly sprayed on the base material by the spraying air, even when piles having different electrical properties are used in combination, the piles have no relation to the electrical properties of each pile. And a uniform processed surface can be continuously obtained.

In the conventional electrostatic flocking method, so-called "dropping" occurs. Dropping refers to a microscopic portion where the base material is exposed without the hair transplanting. Missing occurs as follows. The pile used in the electrostatic flocking method is a fiber cut to a predetermined length, and the length has a certain variation. When performing electrostatic flocking,
When a relatively long pile pierces the adhesive layer at first, the pile subsequently flying around does not pierce the adhesive layer but is adsorbed by the relatively long pile by electrostatic attraction. As a result, there is a portion where the pile is not implanted around the area where the relatively long pile is implanted. This is a problem that can occur as long as the pile implantation is performed only by the electrostatic attraction force and the pile length varies. However, the pile coating method of the present invention can solve this problem. The pile coating method coats the pile by the action of both spraying with spray air in addition to electrostatic suction, so even if a relatively long pile is initially planted, The pile that has flown is not necessarily adsorbed to the relatively long pile, but can also pierce the adhesive layer around the relatively long pile by the action of spraying with the spray air. As a result, in the pile coating method of the present invention, it is possible to greatly suppress the occurrence of dropping which is inevitable in the electrostatic flocking method.

Further, in the pile coating method of the present invention, mixing of the pile to be conveyed by air and the spraying air is performed in a passage immediately before leading to the heating chamber. The formation of lumps can be suppressed. Also, at the start of the pile sprayed from the electrostatic spray gun, the feed was started the screw feeder operation start time than the time t ₁ by the previously conveyed air and spraying air to the electrostatic spray gun, also pile scatter during the stop, by continuing the supply to the electrostatic spraying gun of the during the time from when the operation stop of the screw feeder t ₂ transport air and spraying air, the pile remaining in the system is discharged by the air Spraying can be terminated and the formation of lumps in the system can be prevented.

The pile coating method of the present invention utilizes both the action of electrostatic suction and the action of spraying with scattered air. Attempts to coat the pile using only the action of air blowing may cause the pile to bounce off the substrate surface due to the nature of the air flow, and the pile may not be flocking efficiently. In particular, when a concave part, for example, a console box, a glove box, or the like, which is an automobile part, is sprayed with only air, it is very difficult to uniformly coat the pile. On the other hand, in the pile coating method of the present invention, since the electrostatic suction force is used in addition to the spraying action by the spraying air, parts having a shape difficult to coat the pile only by the spraying action by the air. In addition, the pile can be coated evenly and the area that can be coated at a time is wider, and the efficiency of the coating is significantly larger than when only the action of air blowing is used. It will be.

In the pile coating method of the present invention, if an adhesive having a hue similar to that of the pile or a mat type adhesive is used as the aqueous adhesive for forming the adhesive layer, the pile can be formed at a low density. Even when coated, the hue of the substrate and the adhesive layer can be concealed, and a surface having excellent appearance and texture can be obtained. In addition, when an aqueous adhesive containing a flexible component is used in the pile coating method of the present invention, the surface of the substrate on which the pile is coated is soft due to the properties of both the pile and the adhesive, and has an excellent tactile sensation as if it were a suede. Can be obtained.

The pile coating method of the present invention having the above-mentioned excellent effects is particularly suitable as a processing method for improving the appearance and texture of recycled plastics which have been used in automobile parts and the like in recent years. I have.

[Brief description of the drawings]

FIG. 1 is a schematic view of an embodiment of an apparatus used for the pile coating method of the present invention.

FIG. 2 (a) is a partial cross-sectional view showing a preferred embodiment of the internal structure of the electrostatic spray gun and the arrangement of a transfer hose, a spray air supply hose, and a purge adapter. FIG.
(B) is an external view showing another aspect of the arrangement of the transfer hose, the spraying air supply hose, and the purge adapter.

FIG. 3 is a schematic diagram showing an example of a case where humidified air is supplied to a pile tank.

FIG. 4 is a perspective view showing an example of a case where humidified air is supplied to an electrostatic spray gun.

FIG. 5 shows a switch provided on the electrostatic spray gun;
It is explanatory drawing which shows the ON / OFF relationship about operation | movement of a screw feeder, and supply of each of conveyance air and spraying air.

FIG. 6 is a plan view showing a processed state of a substrate surface obtained by the pile coating method of the present invention.

FIG. 7 (a) is a cross-sectional view of a substrate surface obtained by an electrostatic flocking method. FIG. 7 (b) -1 to (b) -4
It is sectional drawing of the base material surface obtained by the pile coating method of this invention. FIG. 7C is a cross-sectional view of the base material surface obtained by blowing the pile with air.

FIG. 8 is an enlarged view of a cross section of a substrate surface obtained by the pile coating method of the present invention using a pile of two colors.

FIG. 9 is a diagram illustrating the results of a wear resistance test described in Example 7.

[Explanation of symbols]

10. Pile tank 11. Screw feeder 12. Screen 13. Vibrator 14. Outlet 15. Motor 16. Auger 17. Injector 18. Air supply source 19. Pile transfer hose 20. Electrostatic spray gun 21. Spraying air supply hose 22. Purge adapter 23. Spray port 24. Corona pin 25. Heating room 30. Pile feeder 31. Pile 32. Injector pump 33. Air suction port 34. Humidified air 35. Compressed air 41. Substrate 42a. Pile 42b. Pile 42c. Pile 42d. Pile 43. Adhesive layer 44a. White pile 45b. Black pile t ₁ . When on the switch provided in the electrostatic spraying gun, between the start of the supply operation starts of the screw feeder and the conveying air and spraying air time t _2. When the switch provided on the electrostatic spraying gun is turned off, the time between the stop of the operation of the screw feeder and the stop of the supply of the conveying air and the spraying air.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification FI FI Theme Court ゛ (Reference) B32B 7/12 B32B 7/12 (72) Inventor Shigeru Shimoyama 3-38-11 Nishikoiwa, Edogawa-ku, Tokyo Inside Mikasa Paint Co., Ltd. (72) Inventor Takashi Watanabe 1-5-21 Katsushima, Shinagawa-ku, Tokyo Toshin Building 8th Floor Inside Nordson Corporation (72) Inventor Shigeki Sakaguchi 1-5 Katsushima, Shinagawa-ku, Tokyo No. 21 Toshin Building 8F Nordson Co., Ltd. (72) Inventor Hiroshi Nishikawa F-term (reference) 4D075 AA09 AA71 AA86 CB07 EA03 EA06 EA13 EB16 EB19 EB33 EB-222 in Nissen, 222, Kawamukai, Habikino-shi, Osaka EB35 4F034 AA09 BA14 BB04 BB28 4F042 AB04 CB04 EC01 4F100 AB01A AB04 AK01A AK06B AK15 AK22B AK22G AK25B AK25G AK41B AR00B AT00A BA03 BA10A BA10C CB00B CC00B DG03C DG16 EC181 EH76C EH762 EJ62C EJ621 GB72 HB00C JB05B JL02 JL10C JL11B JM01B JN02B JN26B

Claims (15)

[Claims] 1. A pile is conveyed by air to an electric spraying chamber of an electrostatic spray gun, the pile is charged by the electrostatic spray gun, and the conveying air and spray air introduced into the electric spraying chamber cause the pile to be charged. In a pile coating method of coating the pile on the base material surface by spraying from a spray port of the electrostatic spray gun toward a base material surface having an adhesive layer on the surface, the transfer air and the spray air are A pile coating method comprising introducing humidified air into one or both of the two, and using a water-based adhesive as an adhesive for forming the adhesive layer. 2. The pile coating method according to claim 1, wherein two or more types of humidified air having different relative humidities are used. 3. The pile coating method according to claim 1, wherein two or more piles are simultaneously used to obtain a coating surface having a marbling hue. 4. The pile coating method according to claim 1, wherein the mixing of the air-conveyed pile and the spraying air is performed in a passage immediately before the electrostatic spraying gun is connected to the power supply chamber. 5. The pile is conveyed to the electrostatic spray gun through the injector and the air hose by the operation of the screw feeder, and when the pile spray from the electrostatic spray gun is started, the operation of the screw feeder is started. Before the time t ₁ , the supply of the conveying air and the spraying air to the electrostatic spray gun is started, and when the pile spraying is stopped, the conveying air and the spraying air are stopped during the time t ₂ from the stop of the operation of the screw feeder. 2. The pile coating method according to claim 1, wherein the supply of the spray air to the electrostatic spray gun is continued. 6. A water-based adhesive based on a highly concealable paint having a hue similar to the pile hue is used as an adhesive for forming the adhesive layer.
The described pile coating method. 7. The pile coating method according to claim 1, wherein a water-based adhesive based on a matting type high concealment paint is used as an adhesive for forming the adhesive layer. 8. The pile coating method according to claim 1, wherein an aqueous adhesive based on a highly concealable paint containing a flexible component is used as an adhesive for forming the adhesive layer. 9. The pile coating method according to claim 1, wherein an aqueous adhesive based on a synthetic resin emulsion is used as an adhesive for forming the adhesive layer. 10. A synthetic resin emulsion comprising a vinyl acetate resin emulsion, a vinyl acetate copolymer resin emulsion, an acrylate polymer resin emulsion, an acrylate copolymer resin emulsion, an epoxy resin emulsion, a urethane resin emulsion, The synthetic resin emulsion according to claim 9, wherein the emulsion is one or more synthetic resin emulsions selected from the group consisting of a polyester resin emulsion, an acrylic-silicone resin emulsion, a fluororesin emulsion, and a chlorine resin emulsion. Pile coating method. 11. The pile coating method according to claim 1, wherein an aqueous adhesive based on a water-soluble resin is used as an adhesive for forming the adhesive layer. 12. A water-soluble alkyd resin, a water-soluble-modified alkyd resin, a water-soluble polyester resin, a water-soluble-modified polyester resin, a water-soluble acrylic resin, a water-soluble-modified acrylic resin, a water-soluble epoxy resin, One or more water-soluble compounds selected from the group consisting of a water-soluble modified epoxy resin, a water-soluble melamine resin, a water-soluble-modified melamine resin, a water-soluble chlorinated olefin resin, and a water-soluble-modified chlorinated olefin resin. The pile coating method according to claim 11, wherein the pile coating method is a resin. 13. A screw feeder is provided at a lower portion of a pile tank for storing piles, an injector is connected to an outlet of the screw feeder, and the injector is connected to a charging chamber of an electrostatic spray gun by a pile transfer hose. ,
A supply air supply hose is connected between the air supply source and the injector, and a scatter air supply hose is connected between the air supply source and the pile transfer hose or the charging chamber. And a humidifier for introducing humidified air to one or both of the spray air and the spray air. 14. The humidifier selected from the group consisting of a heated humidifier, an ultrasonic humidifier and a bubbling humidifier.
14. The pile coating device according to claim 13, which is a seed or more humidifiers. 15. A pile-coated product having a marbling hue, which is obtained by spraying a pile of two or more colors having a linear shape or a curved shape according to the method of claim 1.