JP2569338B2 - Antistatic agent coating device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an apparatus for applying an antistatic agent to a chargeable member such as plastic or ceramic.

(Prior Art) Generally, a charging member such as a plastic or a ceramic generates static electricity due to friction, so that dust existing in the air near the surface of the charging material easily adheres to the surface due to electrostatic attraction. The dust adhering to the surface of the charging member impairs the appearance of the product and causes a defect.

Therefore, conventionally, a liquid antistatic agent has been applied to the surface of the charging member in order to prevent dust from adhering to the charging member due to the static electricity, thereby removing the static electricity from the charging member.

As an example of the method, there is known a method in which an antistatic agent is atomized by spraying and directly sprayed on the surface of a charging member. In this method, when the particle diameter of the antistatic agent is large, the antistatic agent is sprayed. Since the particles go straight and adhere to the surface of the chargeable member exceeding the air resistance, if the surface shape of the member becomes complicated, the particles cannot go around to the part not exposed in the spray direction of the antistatic agent, and the antistatic The agent cannot be uniformly applied to the member surface. On the other hand, if the particle size of the antistatic agent is small enough to be suspended in air in the form of a mist, when applying an air flow containing the particles of the antistatic agent to the surface of the charging member, the air on the surface of the member is reduced. Antistatic agent particles spread around each part of the complex shape of the member as it diffuses, enabling uniform application.However, the particles are also scattered into the air diffusion other than on the member surface, so a sufficient amount of application However, in order to obtain an antistatic agent, there is a problem in that the amount of the antistatic agent used is bulky and the coating time is long, and the coating efficiency is very poor.

(Problems to be Solved) An object of the present invention is to provide an antistatic agent coating apparatus that solves such inconveniences and that more efficiently applies an antistatic agent to the surface of a charging member than before.

(Means for Solving the Problems) In order to achieve the above object, the present invention provides an antistatic agent coating apparatus which comprises an anionic surfactant, a cationic surfactant or an amphoteric surfactant. A spraying device for ionizing the antistatic agent by spraying the antistatic agent, and a charging member to which the antistatic agent is applied is charged with the polarity of ions of the antistatic agent generated by the spraying device. It is characterized by comprising a discharging device for charging in reverse.

Further, the coating apparatus uses an antistatic agent having a property of being ionized by being sprayed, and improves the coating efficiency by utilizing the property of the antistatic agent.

(Operation) According to the means for solving the problems of the present invention, the spraying device sprays the antistatic agent, which is ionized by being sprayed, to form an antistatic agent having a desired ion polarity and a fine particle diameter. I do. On the other hand, the discharge device charges the conductive member to a polarity opposite to the ionic polarity of the antistatic agent ionized by the discharge electrode. As a result, the antistatic agent uniformly adheres to the complicatedly shaped surface of the charging member by electrostatic attraction.

(Example) An example of the embodiment of the present invention will be described below in detail with reference to the drawings. FIGS. 1 and 2 show an embodiment of the present invention.
Is a discharge electrode, 2 is a spray device, 3 is a pretreatment chamber, and 4 is a coating chamber. A transport device 5 is provided through the pretreatment chamber 3 and the coating chamber 4 and is mounted on the transport device 5. The charging member 6 is transported in the direction of arrow A.

The pretreatment chamber 3 is a housing including a first opening 7, a door 9 that allows the opening 7 to be opened and closed by operation of an air cylinder device 8, and a front wall 11 having a vent 10 with an air filter. .

Downstream of the front wall 11 along the direction of arrow A, a pair of upper and lower discharge electrodes 12 are provided above and below the transfer device 5, and the charged member 6 that has ionized air by corona discharge and is charged is transferred. Between the discharge electrodes by being transported by the device 5
The ionized air neutralizes the static electricity of the member 6 when passing through the gap 12.

Downstream of the discharge electrode 12, a pair of upper and lower dust removing devices 14 having a plurality of air nozzles 13 for blowing compressed air supplied by an air compressor (not shown) are provided above and below the transport device 5, and the discharge electrode 12 is provided. The member 6 whose charge has been removed by the transfer device 12 is transferred by the transfer device 5 to the dust removal device 14.
When the air passes through the space, compressed air is blown from the air nozzle 13 to the member 6 in the direction of arrow B to remove dust adhering to the surface of the member 6. Further, a duct 15 connected to an exhaust pump (not shown) is provided on each side wall of the dust removing device 14, and the dust removed from the surface of the member 6 by the dust removing device 14 is sucked out of the pretreatment chamber 3. To eliminate.

Downstream of the dust removing device 14, a pair of upper and lower discharge electrodes 1 are provided above and below the transport device 5, and the charging member 6 whose dust has been removed by the dust removing device 14 is transported by the transport device 5 and the discharge electrode 1 is discharged. When passing through the space, the member 6 is ionized by corona discharge, and the ionized air charges the member 6 to a polarity opposite to the ion polarity of the antistatic agent sprayed and ionized by the spraying device 2 described later.

The coating chamber 4 is provided downstream of the discharge electrode 1, has a second opening 16, a central wall 19 having a door 18 that allows the opening 16 to be opened and closed by operation of an air cylinder device 17, and a third opening.
20 is a housing including a rear wall 23 having a door 22 that allows the opening 20 to be opened and closed by operation of an air cylinder device 21. An air supply port 25 for attaching a duct 24 communicating with the spraying device 2 is provided on the upper wall and the lower wall of the coating chamber 4, and the member 6 charged by the discharge electrode 1 in the pretreatment chamber 3 is provided. When transported by the transport device 5 and passing between the air supply ports 25, air containing fine particle size ionized antistatic agent supplied from the spray device 2 through the duct 24 is applied to the surface of the member 6. Spray from above and below and apply.

Further, a duct 26 is provided on the side wall of the coating chamber 4 above and below the transfer device 5 in connection with an exhaust pump (not shown),
Excessive antistatic agent mist that has not adhered when spraying and applying the antistatic agent to the charging member 6 is sucked and removed to the outside of the application chamber 4.

Next, in the spraying device 2, a partition plate 28 is provided on a housing 27, and the partition plate 28 vertically partitions the housing 27 into a spray chamber 29 for an antistatic agent and a storage tank 30 for an antistatic agent. A fan 32 is provided on one side of the spray chamber 29. The fan 32 is rotated by a motor 33 to take in air from an air supply port 31 through a filter 34 and guide the air to the spray chamber 29 via a steam separator 35.

Further, an antistatic agent 37 is supplied to the lower end of the storage tank 30 by being connected to one end of a pump 39 provided with a pipe 38.
On the other hand, the other end of the pump 39 is connected to a pipe 40 communicating with the nozzle 36 in the spray chamber 29. The nozzle 36 is connected to the steam-water separator 35.
The antistatic agent, which is provided on a partition plate 28 close to the pressure chamber and pressurized by the pump 39, is sprayed into the spray chamber 29. A steam-water separator 41 is provided on the side of the spray chamber 29 facing the fan 32, and is sprayed by the nozzle 36 and sent to the steam-water separator 41 together with the air by the fan 32. Of the antistatic agents described above, except for the antistatic agent having a large particle size, only the antistatic agent having a small particle size is supplied to the coating chamber 4 through the supply port 42 and the duct 24.

The large particle size antistatic agent that does not pass through the steam separator 41 descends through the return pipe 43 provided on the partition plate 28 and returns to the storage tank 30. The storage tank 30 is provided with an antistatic agent supply port 44, so that the antistatic agent 37 can be supplied to the storage tank 30 as needed.

Next, the operation of the apparatus of the above embodiment will be described. Second
As shown in the figure, the charging member 6 is placed on the transport device 5 and transported in the transport direction A, and the door 9 provided on the front wall 11 is raised by the operation of the air cylinder 8 to perform the pre-processing from the first opening 7. It is transported into the chamber 3. After that, the door 9 descends and the first opening 7
Is closed. When the member 6 is transported and reaches the position facing the discharge electrode 12, the discharge electrode 12 is discharged, and the static electricity charged on the member 6 is neutralized by the ionized air. Next, the member 6 is conveyed to a position facing the air nozzle 13 of the dust removing device 14, and compressed air is blown onto the surface of the member 6 by the air nozzle 13 to remove dust on the surface of the member 6. Then, the removed dust is sucked by the duct 15 and discharged to the outside of the processing chamber 3. Thereafter, the member 6 is charged at a position opposite to the discharge electrode 1 to a polarity opposite to the ion polarity at the time of ionization by spraying the antistatic agent 37 in the spraying device 2.

When the static elimination, dust elimination and charging of the member 6 in the pretreatment chamber 3 are completed in this way, the door 18 provided on the central wall 19 is raised by the operation of the air cylinder 17 and the member 6 is moved to the second opening.
From 16, it is transferred into the coating chamber 4. When the member 6 is conveyed into the coating chamber 4, the air cylinder 17 is operated again, the door 18 is lowered, the second opening 16 is closed, and the pretreatment chamber 3 and the coating chamber 4 are closed.
Is isolated. Thereafter, when the member 6 is conveyed to a position facing the air supply port 25, the fan 32 of the spray device 2
And sprays from the nozzle 36 while the antistatic agent 37 in the storage tank 30 is pressurized through the pipe 38 by the pump 39. Further, the fine particles of the antistatic agent 37 ionized by the spraying pass through the steam / water separator 41 together with the flow of the air, and the antistatic agent 37 having a small particle diameter passes from the fine particle supply port 42 through the duct 24 to the coating chamber 4. Supplied within.
Thereafter, the fine particles of the ionized antistatic agent 37 supplied from the spray device 2 and suspended in the coating chamber 4 are electrostatically attracted to the surface of the member 6 charged to the polarity opposite to the ion polarity of the fine particles, and The surface of the member 6 is covered. When the coating process is completed, the door 22 is raised by the operation of the air cylinder 21 and is conveyed out of the coating chamber through the opening 20 of the member 6.

According to the above-described embodiment, the discharge electrode 12 for removing electricity from the member 6 in the pretreatment chamber 3, the dust removing device 14 downstream of the discharge electrode 12, and the discharge electrode 1 for charging the member 6 downstream of the dust removing device 14 are provided. Since dust attached to the surface of the member 6 from which static electricity has been removed by the discharge electrode 12 can be quickly removed by the dust remover 14, and the duct 15 is provided beside the dust remover 14, Since dust scattered by the air pressure blown from the nozzle 13 onto the nozzle 6 can be suctioned and removed by the duct 15, the discharge electrodes 1 and 12 are not contaminated by dust during dust removal processing. Further, the coating chamber 4 for the antistatic agent is provided separated from the discharge electrodes 1 and 12 by the central wall 19, and the suction duct 26 is provided on the side wall of the coating chamber 4. The scattered excess ionized antistatic agent mist does not diffuse and adhere to the discharge electrodes 1 and 12, so that the electrodes 1 and 12 are not corroded.
Since the antistatic agent mist can be forcibly removed outside the room by the use of 26, the inner wall of the coating chamber 40 can be prevented from being contaminated by the adhesion of the antistatic agent mist.

Ducts 15 for suctioning and removing the dust removed in the present embodiment may be provided above and below the dust removing device 14,
The supply port 24 of the antistatic agent 37 of the ionized fine particles in the coating chamber 4 may be provided on the side wall facing the suction elimination duct 26.

FIG. 3 shows another embodiment. In the case where there is almost no dust on the surface of the charging member 6 and dust removal processing is unnecessary, only the discharge electrode 1 is disposed in the pretreatment 3 as shown in FIG. By using the above-described apparatus, the antistatic agent 37 can be uniformly and efficiently applied to the surface of the member 6 as in the above embodiment.

Note that the antistatic agent used in the above examples is dissociated into ions in a polar solvent such as water or a lower alcohol, and an aqueous solution of an anionic surfactant such as an alkyl phosphate ester or a sulfate salt of a nonionic surfactant, A lower alcohol solution or a mixed solution of water and a lower alcohol is preferable, and a cationic surfactant such as a quaternary ammonium salt or an alkylimidazoline derivative can be used as the solute. As the solute, an amphoteric surfactant can also be used.

(Effects) Therefore, according to the present invention, the spraying device sprays the antistatic agent which is ionized by spraying to form an antistatic agent having a desired ion polarity and a fine particle diameter, while the discharging device is Since the chargeable member is charged to a polarity opposite to the ion polarity of the antistatic agent ionized by the discharge electrode, the antistatic agent is uniformly and efficiently attached to the complex shape of the chargeable member by electrostatic attraction. be able to. Further, according to the present invention, since the antistatic agent is ionized by being sprayed, a discharge device such as a discharge electrode for ionizing the antistatic agent can be omitted.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention, FIG. 2 is an explanatory sectional view showing an embodiment of the present invention, and FIG. 3 is an explanatory sectional view showing another embodiment of the present invention. . 1. Discharge electrode 2. Spray device

Claims (1)

(57) [Claims] 1. An antistatic agent comprising an anionic surfactant, a cationic surfactant or an amphoteric surfactant,
A spraying device for ionizing the antistatic agent by spraying the antistatic agent, and charging the charging member to which the antistatic agent is applied in a direction opposite to the polarity of ions of the antistatic agent generated by the spraying device. A coating device for an antistatic agent, comprising a discharging device.