JPH07299408A - Coating applicator - Google Patents

Abstract

PURPOSE:To provide a coating applicator capable of surely removing a coating material infiltrating to the rear surface side of a coating material scraping member. CONSTITUTION:This coating applicator is used to apply a coating material C at a uniform thickness on the surface of long-sized paper 1. The coating applicator has a knife part 3a of the coating material scraping member 3 in contact with or proximity to the coating surface of this long-sized paper 1, a transporting roller 2 for moving the long-sized paper 1 relative to the coating material scraping member 3 and a piezoelectric element 4 disposed on the rear surface side on the side facing the coating material stagnating part of the knife part 3a of the coating material scraping member. The coating material C infiltrating the rear surface side of the knife part 3a is splashed by the ultrasonic vibrations of this piezoelectric element 4, by which remaining of such coating material in the form of liquid drops is prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coating device for coating a roll paper or other material to be coated with a coating agent.

[0002]

2. Description of the Related Art For example, an apparatus shown in FIG. 3 is conventionally known as an application apparatus for applying a coating agent on paper to produce a raw fabric. In this apparatus, the long paper 51 is conveyed by the conveyance rollers 52, so that the long paper 51 is relatively moved with respect to the comma coater 53 as a scraping member. Then, the lower end knife portion 53a of the comma coater 53
The coating agent C is scraped off by and is applied uniformly on the long paper 51. A slit suction member 54 is provided on the back surface side of the knife portion 53a.

As shown in FIG. 4, the slit suction member 54 has a suction port 55, and the air therein is sucked to the outside through the suction port 55 by a vacuum pump (not shown). By this air suction, the coating agent wrapping around on the back surface side of the knife portion 53a is sucked up, so that the occurrence of an original defect due to the dropping of the coating agent is prevented.

An apparatus shown in FIG. 5 is also known as a conventional coating apparatus. In this apparatus, a wiper 56 is provided on the back surface side of the knife portion 53a, and the wiper 56 is moved up and down or left and right with respect to the long paper 51 as shown in FIG. Scrap off the coated coating agent.

[0005]

However, in the above-mentioned conventional coating apparatus, the removal of the coating agent wrapping around the back side of the knife portion was incomplete. The present invention has been made in order to solve the problem, and an object of the present invention is to provide a coating device that can reliably remove the coating agent that has wrapped around the back surface side of the coating agent scraping member.

[0006]

In order to achieve the above object, a coating apparatus according to the present invention is a coating apparatus for coating a coating material with a coating agent, which is in contact with or close to a coating surface of the coating material. A coating agent scraping member, a conveying means for moving the coating agent scraping member relative to the material to be coated, and a back surface side of the coating agent scraping member facing the coating agent reservoir. And a vibrating element.

The material and shape of the material to be coated are not limited to particular ones, and various materials such as a roll-shaped long material and a sheet-shaped material can be applied. The material of the coating agent is not limited to a particular material. The shape of the coating agent scraping member is not limited to a particular shape, but a comma coater having a knife portion, a plate-shaped wiper, or the like can be considered.

The conveying means for moving the coating material scraping member relative to the material to be coated is either one for moving the coating material scraping member side or one for moving the coating material scraping side. Is also good. Although various structures can be considered, when a long object is applied as the material to be coated, a conveyor roller that rotates in a state where the long object is laid can be used as the conveying means.

As the vibrating element, any element that vibrates at high frequency or ultrasonic waves can be used, and for example, a piezoelectric element can be used.

[0010]

The function of the conveying means moves the coating agent scraping member and the material to be coated relatively. Then, a coating agent reservoir is formed at a position upstream of the coating agent scraping member. The coating agent that forms the coating agent reservoir is evenly supplied onto the coating material through between the scraping member and the coating material. In this way, the coating agent is uniformly applied onto the material to be coated that has been carried out to the downstream side of the scraping member. The vibrating element vibrates, preferably ultrasonically vibrates a portion of the coating agent scraping member close to the material to be coated, and by this vibration, the coating agent wrapping around the back surface side of the scraping member is blown off and removed. ,
The coating agent is prevented from dropping onto the material to be coated after the coating process is completed.

[0011]

EXAMPLE FIG. 1 shows an example of a coating apparatus according to the present invention. This coating apparatus has a conveyance roller 2 that rotates in a state where a long paper 1 as a material to be coated is laid over it, and a comma coater 3 that is arranged facing the conveyance roller 2 and that serves as a coating agent scraping unit. ing. A knife portion 3a is provided at the lower end of the comma coater 3, and the tip of the knife portion 3a contacts or approaches the surface of the long paper 1.

The lengthy paper 1 is driven by the conveying roller 2 and moves relatively to the comma coater 3, and a reservoir for the coating agent C is formed on the upstream side of the comma coater 3 in the moving direction. A piezoelectric element 4 as a vibrating element is fixed to the back surface side of the knife portion 3a. A high frequency power supply 5 is electrically connected to the piezoelectric element 4.

Since the coating apparatus of the present embodiment is constructed as described above, when the long object 1 driven by the conveying roller 2 moves under the knife portion 3a of the comma coater 3, the coating agent C A fixed amount of the coating agent C is sent out from the accumulation portion onto the long material 1 and applied on the long material 1 with a uniform thickness. While this coating operation is being performed, the piezoelectric element 4
A high-frequency voltage is applied to the piezoelectric element to ultrasonically vibrate and a surface acoustic wave is generated, which causes the coating agent that wraps around the back side (right side in the figure) of the knife section 3a to be forced from the knife section 3a. Is blown away and removed, so
It is prevented that the coating agent C becomes droplets and remains on the knife portion 3a. As a result, the coating agent C does not drop on the long paper 1 conveyed to the downstream side of the comma coater 3, and the generation of defective products is prevented.

When the frequency of the piezoelectric element 4 is increased, the elastic wave becomes weaker, and when the frequency is lowered, the elastic wave becomes stronger. In actual operation, a frequency that does not adversely affect the surface of the long paper 1 is selected, but it is preferably 20 kHz.
The frequency is set to about 100 kHz.

FIG. 2 shows another embodiment of the coating apparatus according to the present invention. This embodiment differs from the embodiment shown in FIG. 1 in that a plate-shaped scraping member 6 is used instead of the comma coater 3 as the coating agent scraping member. In this embodiment, the coating agent C is uniformly applied onto the long paper 1 while the long paper 1 conveyed by the conveyance rollers 2 passes between the scraping member 6 and the abutting member 7. To be done.

To remove the coating agent C from the scraping member 6 by fixing the piezoelectric element 4 to the back surface side of the scraping member 6 and ultrasonically vibrating the scraping member 6 by the action of the piezoelectric element 4. This is the same as in the first embodiment.

The present invention has been described above with reference to the preferred embodiments, but the present invention is not limited to the embodiments and can be variously modified within the technical scope described in the claims.

[0018]

According to the coating apparatus of the first aspect, even if the coating agent wraps around the back surface of the coating agent scraping member, the coating agent is blown away by generating ultrasonic waves. Prevents the formation of droplets. This prevents the coating agent from dropping onto the treated material.

According to the coating device of the second aspect, ultrasonic vibration can be generated without complicating the structure of the coating agent scraping member.

[0020]

[Brief description of drawings]

FIG. 1 is a front view showing an embodiment of a coating apparatus according to the present invention.

FIG. 2 is a front view showing another embodiment of the coating apparatus according to the present invention.

FIG. 3 is a front view showing an example of a conventional coating device.

FIG. 4 is a diagram showing a main part of the coating apparatus shown in FIG.

FIG. 5 is a front view showing another example of a conventional coating device.

6 is a diagram showing a main part of the coating device shown in FIG.

[Explanation of symbols]

 1 Long paper (material to be coated) 2 Conveying roller (conveying means) 3 Comma coater (coating agent scraping member) 4 Piezoelectric element (vibrating element) 6 Plate-shaped scraping member 7 Abutting member

Claims (2)

[Claims] 1. In a coating device for coating a material to be coated with a coating agent, a coating agent scraping member that comes into contact with or close to a coating surface of the material to be coated and a coating agent scraping member relative to the material to be coated. And a vibrating element provided on the back surface side of the coating agent scraping member facing the coating agent reservoir. 2. The coating apparatus according to claim 1, wherein the vibrating element is a piezoelectric element.