JP2002320900A - Automatic doctor cleaning device and cleaning method for the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an automatic doctor cleaning device which is free of variations in the degree of cleaning of a doctor used for gravure printing or the like and is good in working efficiency and a cleaning method for the same. SOLUTION: This automatic doctor cleaning device includes at least a clearing tank body 10 housing a cleaning liquid 18, a filter 14 pierced with microholes 14a disposed at its bottom and a compressed air generating body 16 for spouting compressed air A. This method of cleaning the doctor comprises placing the doctor 20 on a doctor set frame 12 so as to be immersed into the cleaning liquid 18 and spouting the compressed air A in a range of pressure (9.8 to 490)×10<-4> Pa through the microholes 14a from the compressed air generating body 16 like jet flow, thereby cleaning the doctor.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to cleaning of a doctor for scraping off excess ink of a gravure plate used for gravure printing or gravure coating, and more particularly to an automatic cleaning apparatus which is not manually operated and which uses the same. It relates to a cleaning method.

[0002]

2. Description of the Related Art In gravure printing and gravure coating, a doctor holding a doctor blade (blade) in a doctor holder is used in order to leave ink in cells (recesses) of a cylinder plate and scrape off excess ink. For example, every time the ink or the coating liquid to be used is changed, the ink or the like adhering to the ink must be washed. Conventionally, in this cleaning, the entire doctor is immersed in a cleaning liquid, then taken out, and the cleaning liquid is contained in a waste cloth or a nonwoven fabric, and is manually cleaned. As the cleaning liquid, the solvent used for the ink or coating liquid to be used is mainly used. Specifically, water, alcohol (such as isopropyl alcohol), toluene, methyl ethyl ketone, or a mixture thereof is used. It is used.

[0003]

However, in the above-mentioned manual cleaning method, there is a risk that the sharp doctor blade (blade) may cause injury or the hand may be roughened by a solvent. Wearing gloves reduces workability (efficiency, etc.), and the organic solvent used is a solvent that falls under the organic solvent poisoning prevention regulations of the Labor Safety Act. And its countermeasures, health checkups for workers, etc.), there are many difficulties, including costs.

[0004] Further, since it is a manual operation, there is a problem that the degree of the cleaning varies, and some of the cleaning requires re-cleaning, which is inefficient.

[0005] The present invention is to solve the problems of the prior art, and an object thereof is to clean a doctor used for gravure printing or gravure coating.
An object of the present invention is to provide an automatic doctor cleaning apparatus and a cleaning method thereof, which have no variation in the degree of the cleaning and have high working efficiency.

[0006]

Means for Solving the Problems In order to achieve the above object in the present invention, according to the first aspect of the present invention, at least a cleaning tank main body containing a cleaning liquid, and a cleaning tank main body provided at the bottom of the cleaning tank main body. An automatic doctor cleaning apparatus comprising: a filter provided with a large number of micropores; and a compressed air generator for ejecting compressed air below the filter.

Further, in the invention of claim 2, a cleaning liquid is accommodated in a cleaning tank constituting the automatic doctor cleaning apparatus, and the doctor is placed on a doctor set frame or a filter so as to be immersed in the cleaning liquid, and the compressed air is supplied. A doctor cleaning method characterized in that compressed air is ejected upward from a generator through micropores of the filter to clean the doctor.

Further, in the invention according to claim 3, the pressure of the compressed air is 9.8 × 10 ^{−4 to} 490 × 10 ⁻⁴ Pa.
3. The method for cleaning a doctor according to claim 2, wherein:

In the cleaning method using the automatic doctor cleaning apparatus of the present invention, a doctor is set on a doctor set frame or a filter, immersed in a cleaning solution, immersed for an appropriate time, and then provided with a filter at the bottom of the cleaning tank. 9.8 × 10 ^-4 pressure from the compressed air generator at the bottom of the filter to the doctor
The ink, etc. attached to the doctor is washed by vertically ejecting compressed air in the range of 490 × 10 ⁻⁴ Pa. It is possible to provide a doctor automatic cleaning apparatus and a cleaning method thereof that can perform uniform cleaning without variation in a short time without performing.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. As shown in the perspective view of FIG. 1, for example, the doctor automatic cleaning device of the present invention comprises a cleaning liquid (18).
Tank body (10) for accommodating the cleaning tank body (1)
Doctor set frame (12) provided on the upper wall side of 0)
A filter (14) having a large number of micropores (14a) formed in the bottom of the cleaning tank body (10);
A compressed air generator (16) for ejecting compressed air sent from a compressor (not shown) through a pipe (15) from a minute hole (14a) of the filter (14) is provided below the filter (14). It is a doctor automatic cleaning device (100) provided.

The filter (14) may be made of a steel material such as iron or stainless steel, or a material which is not affected by a cleaning liquid such as toluene or methyl ethyl ketone, and may be a polyester resin. The micropores (14a) formed in the filter (14) are 0.5
A filter having a diameter in the range of 1 to 20 mm, preferably 1 to 5 mm, and a distance between the micropores (14 a) in the range of 1 to 50 mm, preferably 3 to 20 mm, so that the filter can be cleaned as efficiently as possible. Should be selected.

The automatic doctor cleaning device (10)
A method for cleaning a doctor using the method 0) will be described. First, as shown in the schematic side view of FIG. 2, for example, a cleaning liquid (18) is poured into a cleaning tank body (10). Subsequently, a necessary number of doctors (20) to be cleaned are placed and set on a doctor set frame (12) provided on both side walls of the cleaning tank body (10). At this time, the amount of the cleaning liquid (18) needs to be such that the doctor (20) is completely immersed.

As shown in the schematic side sectional view of FIG.
For example, the doctor (20) can be placed directly on the filter (14). In this case, the doctor set frame is unnecessary, but the strength of the filter (14) must be able to withstand the heavy doctor (20). At this time, the doctor (20) is placed on the filter (23) using the blade of the doctor blade (22) sandwiched between the two doctor holders (21) and the ink return (23) on the side of one of the doctor holders. 14).

After immersing the doctor (20) in the washing liquid (18) in this manner, a few minutes later, the pressure is in the range of 9.8 × 10 ^{−4 to} 490 × 10 ⁻⁴ Pa, preferably 20 ×, from the external compressor. Compressed air (A) in the range of 10 ^{-4 to} 100 × 10 ^-4 Pa is passed through a pipe (15) to a filter (1).
4) into the compressed air generator (16) at the bottom of
From the compressed air generator (16), the compressed air (A) rises substantially vertically upward through the fine holes (14a) of the filter (14).
Is jetted as a jet stream to wash the doctor (20) located above the jet stream. The pressure of the compressed air depends on the diameter and number of the micropores (14a) of the filter (14), but if it is less than 9.8 × 10 ⁻⁴ Pa, the jet flow by the compressed air (A) is too weak to wash. There is a risk that the time will not be shortened or cleaning will be insufficient.
If the pressure exceeds 0 × 10 ⁻⁴ Pa, the jet flow is too strong, and the cleaning liquid (18) may be spilled out of the cleaning tank body (10).

The automatic doctor cleaning device (100)
It is common to attach a lid (not shown) to the upper opening of the device so as to seal the cleaning solution. However, in the automatic doctor cleaning device of the present invention, since there is almost no manual operation, a closed structure is always required. There is no need to perform this operation, and it is possible to further reduce labor in terms of cost by using an open type in which only a local exhaust device is installed as needed.

The automatic doctor cleaning apparatus (100) of the present invention.
As described above, the cleaning liquid (18) used for the gravure printing or the gravure coating varies depending on the ink or the coating liquid as described above. For example, if the ink or the coating liquid is an aqueous type including an emulsion type, A mixture of water and isopropyl alcohol at a ratio of 1: 9 is used. In the case of an organic solvent mainly containing ketones such as toluene, a mixed solution of toluene and methyl ethyl ketone is generally used. .

[0017]

Next, the present invention will be described in detail with reference to examples. As shown in FIG. 1, 100 liters of a cleaning liquid (18) consisting of 5 parts of toluene, 4 parts of methyl ethyl ketone, and 1 part of isopropyl alcohol was charged into a cleaning tank main body (10) of 1300 × 200 × 700 mm. Next, as shown in FIG. 3, a doctor (20) having a length of 1100 mm and stained with an organic solvent-based gravure ink: New-LP Super (trade name, manufactured by Toyo Ink Mfg. Co., Ltd.) was directly put on a filter (14) for 10 minutes. After the main body is set and immersed in the cleaning liquid (18) for about 2 minutes, compressed air (A) having a pressure of 50 × 10 ⁻⁴ Pa is sent to the compressed air generator (16). Micropores (14a) having a diameter of 3 mm and an interval of 5 mm are formed in each of the holes 120.
The washing of the doctor (20) was completed by injecting compressed air (A) vertically upward through a stainless steel filter (14) of 0 × 600 mm for 20 seconds.

The doctor (2) cleaned in Example 1 above
In the case of (0), all the 10 samples were washed uniformly. In addition, about 10 doctors stained with the same ink
When a person soaked for one minute was manually washed as in the past, it took a relatively long time of about 11 minutes as a relatively heavy labor, and the degree of the washing was uneven.

[0019]

As described above, the present invention has the following effects. That is, a cleaning tank main body containing a cleaning liquid, a filter provided with a large number of micro holes provided at the bottom of the cleaning tank main body, and a compressed air generator for blowing compressed air to a lower portion of the filter. In the cleaning using the provided automatic doctor cleaning device, the doctor is set on the doctor set frame or the filter and immersed in the cleaning solution, immersed for an appropriate time, and then the filter at the bottom of the cleaning tank is cleaned. Attached to the doctor by vertically blowing compressed air at a pressure in the range of 9.8 to 490 × 10 ⁻⁴ Pa from the compressed air generator at the bottom of the filter through the micropores to the doctor. It quickly cleans ink and other materials without the need for manual intervention as in the past, thus avoiding injuries and rough hands. There can be uniformly cleaned become doctor automatic cleaning device to be able to provide the cleaning method.

Therefore, the present invention exerts an excellent practical effect as a doctor cleaning apparatus and method for gravure printing or coating.

[Brief description of the drawings]

FIG. 1 is a perspective view schematically illustrating an automatic doctor cleaning apparatus according to an embodiment of the present invention.

FIG. 2 is a schematic side sectional view for explaining one embodiment of cleaning using the automatic doctor cleaning apparatus of the present invention.

FIG. 3 is a schematic side sectional view for explaining another embodiment of cleaning using the automatic doctor cleaning apparatus of the present invention.

[Explanation of symbols]

 10 ‥‥ Cleaning tank body 12 ‥‥ Doctor set frame 14 ‥‥ Filter 14a ‥‥ Micro hole 15 ‥‥ Pipe 16 ‥‥ Compressed air generator 18 ‥‥ Cleaning liquid 20 ‥‥ Doctor 21 ‥‥ Doctor holder 22 ‥‥ Doctor blade 23 ‥‥ Ink return 100 ‥‥ Doctor automatic cleaning device A ‥‥ Compressed air

Continued on the front page F-term (reference) 2C250 FB23 3B201 AA47 AB51 BB02 BB21 BB88 BB90 BB98 4D075 AB02 AB12 AB33 AB55 BB65X BB69X BB93X DA06 DB01 DC16 EA07 EC30 4F040 AA20 AB20 AC02 BA42 CC03 CC06 DB23 BA06 DD06A

Claims (3)

[Claims] 1. A cleaning tank main body containing at least a cleaning liquid, a filter provided at a bottom portion of the cleaning tank main body with a plurality of fine holes, and compressed air for blowing compressed air to a lower portion of the filter. An automatic doctor cleaning apparatus comprising a generator. 2. A washing tank constituting the automatic doctor washing apparatus is provided with a washing liquid, and the doctor is placed on a doctor set frame or a filter so as to be immersed in the washing liquid. A method of cleaning a doctor, comprising blowing compressed air upward through a hole to clean the doctor. 3. The pressure of the compressed air is 9.8 × 10 ^-4 to
3. The method for cleaning a doctor according to claim 2, wherein the pressure is in a range of 490 × 10 ⁻⁴ Pa.