JPH11138081A - Coating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the accumulation of a coating material and the temperature unevenness of a coating head, by installing mist nozzles spraying a mist which is a mixture of water and air in the vicinity of a coating head of a coating device, and spraying the mist to the whole of the coating head to be always damped. SOLUTION: While base paper W is running by a backing roll 1, the base paper W is coated with a coating material (a) by jetting it upward from a nozzle 5 lying between front and rear lip parts 3 and 4 of a fountain header 2 which is disposed below the backing roll 1. A measuring part 6 is disposed at a forward part in the advancing direction of the base paper W, away from the header 2, thereby the applied coating material (a) is partially removed to be smoothed. In this case, mist nozzles A1 and A2 which spray a mist to the back surfaces of the front and rear lip parts 3 and 4 respectively are installed, and the accumulation of the coating material on the head 2 can be prevented by spraying a mist which is a mixture of water and air from these mist nozzles A1 and A2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a coating apparatus.
More specifically, the present invention relates to a coating apparatus for applying a paint to the surface of base paper made by a paper machine.

[0002]

2. Description of the Related Art There are various types of coating apparatuses. In each case, a coating material is applied to the surface of a base paper with a header, a blade or a rod. In these coating devices, the coating liquid may adhere to the header, the back of the blade, and the rod holder during operation. The quality of the paper will be reduced. Therefore, as a conventional coating apparatus which has attempted to solve the above-mentioned problem, Japanese Utility Model Registration No. 25
01724 (Conventional Example I) and Japanese Patent Publication No. 7-11034
No. 6 (conventional example II) is proposed. The conventional example I is a fountain type coating device,
By spraying steam onto the lip at the tip of the fountain header to prevent the adhering paint from drying out,
II is a pre-blade type coating device, which sprays steam to the blade to prevent the paint adhered from drying.

[0003]

However, in the above conventional examples I and II, the back surface of the nozzle and the rod can be appropriately wetted by the steam to prevent the paint from being dried and deposited.
In these methods, since steam is used, there is a problem that temperature unevenness of the object occurs, and a coating profile in a width direction of the coating apparatus is deteriorated. In addition, since the steam supply pipe needs to be placed near the coating head, it comes into contact with the high-temperature steam pipe during maintenance and inspection of the equipment, for example, during cleaning or replacement. There was a danger.

[0004] In view of such circumstances, an object of the present invention is to provide a coating apparatus that can prevent the accumulation of paint, does not cause temperature unevenness in the coating head, and eliminates the risk of injury to workers.

[0005]

According to the present invention, there is provided a coating apparatus comprising:
In the vicinity of a header, a blade or a rod constituting a coating head of a coating apparatus, a mist nozzle for spraying a mist of a mixture of water and air is provided, and the header,
The mist is sprayed over the entire width of the blade or rod so as to be constantly moistened. The coating apparatus according to claim 2 is characterized in that a setting device that adjusts the pressure of water is provided in the mist nozzle or in a water supply pipe that supplies water to the mist nozzle. The mist nozzle or a water supply pipe for supplying water to the mist nozzle is provided with a setting device for adjusting a flow rate of water. Either the setting device for adjusting the pressure or the setting device for adjusting the flow rate may be provided, but it is preferable to provide both, and the invention of claim 3 which refers to claim 2 adjusts the pressure and flow rate. The configuration in which both setting devices are provided is specified. The coating apparatus according to claim 4 is characterized in that a setting device that adjusts the pressure of air is provided in the mist nozzle or an air pipe that supplies air to the mist nozzle. The mist nozzle or an air pipe for supplying air to the mist nozzle is provided with a setting device for adjusting a flow rate of air. Either the setting device for adjusting the air pressure or the setting device for adjusting the air flow rate may be provided, but it is preferable to provide both of them. The configuration in which both setting devices to be adjusted are provided is specified. The inventions of claims 4 and 5 citing claims 2 and 3 specify the configuration of a combination of a setter for adjusting the flow rate and pressure of water and a setter for adjusting the flow rate and pressure of air. Claims 6 to 8 specify configurations relating to various types of coating apparatuses. The coating apparatus according to claim 6 is a fountain type coating apparatus, and a fountain header or a blade of the coating apparatus. The mist nozzle is arranged so as to spray mist to the mist. A coating apparatus according to a seventh aspect is a pre-blade type coating apparatus, wherein the mist nozzle is arranged so as to spray mist to a pre-blade or a blade of the coating apparatus. The coating apparatus of claim 8 is a film transfer type coating apparatus, wherein the mist nozzle is arranged so as to spray mist on a rod or a grade of the coating apparatus.

[0006]

Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a side view of a main part of a fountain type coating apparatus according to an embodiment of the inventions of claims 1 and 6, FIG. 2 is a perspective view of a main part of the coating apparatus, and FIG.
FIG. 4 is a side view of a main part of a pre-blade type coating apparatus according to an embodiment of the invention of claim 7; FIG. 4 is a perspective view of a film transfer type coating apparatus according to an embodiment of the invention of claims 1 and 8; FIG. 5 is a side view of a part, and FIG.

An embodiment of a fountain type coating apparatus will be described with reference to FIGS. Reference numeral 1 denotes a backing roll, and the rotation of the backing roll 1 causes the base paper W to move in the direction of the arrow along the surface of the backing roll 1. 2
Is a fountain header, which is arranged below the backing roll 1. Also, this fountain header 2
Has a front lip portion 3 and a rear lip portion 4, and sprays paint a upward from a nozzle 5 between the front and rear lip portions 3, 4.

The fountain header 2 has substantially the same width as the backing roll 1 so that the paint can be applied to the entire width of the base paper W. The fountain header 2
A measuring unit 6 composed of a blade or a rod is disposed at a position away from the base paper W in the traveling direction of the base paper W so as to smoothly scrape the paint a applied to the surface of the base paper W.

A1 and A2 denote mist nozzles, which are arranged at positions for spraying mist toward the back of the front lip 3 and the back of the rear lip 4. In addition, the number necessary for spraying the mist over the entire width of the fountain header 2 is provided along the width direction of the fountain header 2. Therefore, the number of mist nozzles A1 and A2 increases as the width of the device increases, and the mist nozzles A1 and A2
In some cases, for example, installation at only both ends or one end in the width direction of the device may be sufficient. In a coating apparatus using a blade without using a nozzle, the mist nozzles A1 and A2 may be arranged at positions where the mist is sprayed on the blade.

If the mist is sprayed onto the back of the lip portions 3 and 4 of the fountain header 2 by the mist nozzles A1 and A2 so that the surface is not always dried, the paint will not be deposited even if the paint adheres. For this reason, the inconvenience that the coating surface c has a streak does not occur.

Next, an embodiment of a pre-blade type coating apparatus will be described with reference to FIG. The point that the base paper W travels along the surface of the backing roll 1 by the rotation of the backing roll 1 is the same as in the above embodiment. 11 is a coating liquid supply header, 12 is an applicator beam, and 13 is a pre-blade. The pre-blade 13 is provided to uniformly supply the paint a in the width direction when supplying the paint a supplied from the coating liquid supply header 11.

Reference numeral 14 denotes a blade beam to which a scraping blade 15 is attached. With this scraping blade 15, the thickness of the coating material a applied to the base paper W is made uniform. Reference numeral 16 denotes a liquid recovery tank for recovering excess paint a scraped off by the scraping blade 15. A1, A2 and A3 are mist nozzles.
The mist nozzles A1 and A2 are located at positions where the mist is sprayed on the pre-blade 13, and the mist nozzle A3 is located on the scraping blade 1
5 is provided at a position where the mist is sprayed.

Also in this embodiment, the mist is applied to each blade 13 by the mist nozzles A1, A2 and A3.
Since the spray is sprayed on the back surface of the cover 15 so that the surface is not always dried, the paint does not accumulate.

Next, an embodiment of a film transfer type coating apparatus will be described with reference to FIG. Also in this embodiment, the stencil paper W runs along the surface of the backing roll 1 by the rotation of the backing roll 1. Reference numeral 21 denotes a header pipe, and reference numeral 22 denotes a nozzle for supplying paint. Reference numeral 23 denotes a coating rod, which is rotatably held by a rod holder 24 and is attached to the tip of an adjuster 25. The coating rod 23 rotated in the direction opposite to the rotation direction of the backing roll 1 is configured such that the thickness of the coating material a supplied from the header pipe 21 is uniform. A denotes a mist nozzle, which is disposed at a position where the mist is sprayed toward the coating rod 23 and the rod holder 24. In a coating apparatus using a blade without using a rod, the mist nozzle A may be arranged at a position where the mist is sprayed on the blade.

Also in this embodiment, the mist is applied to the rod 23 and the rod holder 2 by the mist nozzle A.
4 is sprayed to prevent the surface from drying at all times, so that even if the paint is sprinkled, it does not accumulate.

As shown in FIG. 5, each of the mist nozzles A is preferably configured such that the pressure and flow rate of supplied water and air can be adjusted. The flow rate is preferably 1.1 liter / H to 15.6 liter / H, and the air flow is preferably 13.4 liter / min to 25 liter / min. Water supply pipe 31 for supplying water to mist nozzle A
And an air pipe 41 for supplying air are connected,
The air and the air are mixed in the mist nozzle A to form a mist and spray. A pump 32 as a water supply source is connected to the water supply pipe 31, and a filter 33, an electromagnetic on-off valve 34, a pressure control valve 35, a flow control valve 3
6 are interposed.

The air pipe 41 is connected to a compressor 42, a filter 43, and an air tank 47 as an air supply source.
5. A flow control valve 46 is interposed. The pressure control valves 35 and 45 and the flow control valves 36 and 46 may be built in the mist nozzle A, or may be interposed in the pipes 31 and 41.

The electromagnetic on-off valves 34 and 44 are used not only for controlling the start and stop of the supply of water or air, but also for controlling the intermittent supply. Pressure control valves 35, 45
And the flow control valves 36 and 46 are used to control the pressure of water and air and / or the pressure depending on the operating conditions of the coating apparatus, the type of paint, and the properties of the base paper.
Alternatively, it is provided for adjusting the flow rate, and either one or both may be used. By adjusting the set values of the pressure control valves 35 and 45 and the flow control valves 36 and 46, the header and the blade rod are adjusted so as to be constantly moistened with the minimum amount of water.

The mist of water (mist) sprayed from the mist nozzle A is usually sprayed continuously, but the amount of water may be reduced depending on the degree of wetness, in which case it may be intermittently sprayed. In this case, the electromagnetic on-off valves 34, 44
The spray duty ratio may be set according to the following.

[0020]

According to the first and sixth to eighth aspects of the present invention, since the mist is sprayed on the entire width of the header, the blade, and the rod to which the coating is applied, the coating does not deposit even if the coating adheres. Therefore, no trouble occurs on the painted surface. Also,
Since low-temperature water is used, temperature unevenness does not occur, and the operator is not burned. According to the coating apparatus of claims 2 to 5, the supply amount and supply pressure of water and air can be optimally set according to the operating conditions of the coating apparatus, the properties of the paint, and the type of base paper. The amount of water can effectively control the deposition growth of the paint.

[Brief description of the drawings]

FIG. 1 is a side view of an essential part of a fountain type coating apparatus according to an embodiment of the present invention.

FIG. 2 is a perspective view of a main part of the coating apparatus.

FIG. 3 is a side view of a main part of a pre-blade type coating apparatus according to an embodiment of the present invention.

FIG. 4 is a side view of a main part of a film transfer type coating apparatus according to an embodiment of the present invention.

FIG. 5 is a water supply air piping diagram of a mist nozzle.

[Explanation of symbols]

 Reference Signs List 1 backing roll 2 fountain header 13 pre-blade 15 scraping blade 23 coating rod A mist nozzle A1 mist nozzle A2 mist nozzle A3 mist nozzle

Claims (8)

[Claims] A mist nozzle for spraying a mist obtained by mixing water and air is provided near a header, a blade or a rod constituting a coating head of a coating apparatus, and the mist nozzle is provided over the entire width of the header, blade or rod. A coating device characterized by being sprayed with water and constantly moistened. 2. A coating apparatus according to claim 1, wherein a setting device for adjusting a pressure of water is provided in said mist nozzle or a water supply pipe for supplying water to said mist nozzle. 3. The coating apparatus according to claim 1, wherein a setting device for adjusting a flow rate of water is provided in the mist nozzle or in a water supply pipe for supplying water to the mist nozzle. 4. The coating apparatus according to claim 1, wherein a setting device for adjusting air pressure is provided in the mist nozzle or an air pipe for supplying air to the mist nozzle. 5. The coating according to claim 1, wherein the mist nozzle or an air pipe for supplying air to the mist nozzle is provided with a setting device for adjusting the flow rate of air. apparatus. 6. A fountain type coating apparatus, wherein the mist nozzle is arranged to spray mist to a fountain header or a blade of the coating apparatus. Terms 1, 2, 3, 4
Or the coating apparatus according to 5. 7. The coating apparatus is a pre-blade type coating apparatus, wherein the mist nozzle is arranged to spray mist to a pre-blade and a scraping blade of the coating apparatus. The coating device according to claim 1, 2, 3, 4, or 5. 8. The coating apparatus according to claim 1, wherein the coating apparatus is a film transfer type coating apparatus, and the mist nozzle is arranged to spray mist to a rod or a blade of the coating apparatus. The coating device according to 2, 3, 4, or 5.