JP6963885B2 - How to clean the blanket torso - Google Patents

Description

The present invention relates to a method for cleaning a blanket cylinder for cleaning the surface of the blanket cylinder of an offset printing press.

In newspaper printing and commercial printing, an offset printing machine is used as the printing machine format. The offset printing machine includes a plate cylinder and a blanket cylinder. A plate on which an image to be printed is formed by a hydrophilic non-image portion and a lipophilic image portion is mounted on the plate cylinder.

First, dampening water is supplied to the plate cylinder. Then, a water film is formed on the hydrophilic part. This dampening water is water whose components have been prepared for offset printing with water. Depending on the printing machine, tap water or the like may be used as it is, and in that case, the components of the dampening water and the general water are not different. Next, ink is supplied to the plate cylinder. Then, an ink film is formed on the lipophilic portion. That is, on the surface of the plate cylinder, an image to be printed is formed separately in an ink region and a water region.

The blanket cylinder is a cylinder that comes into contact with printing paper. When the plate cylinder and the blanket cylinder come into contact with each other, the ink image of the plate cylinder is transferred to the blanket cylinder. The blanket body transfers this ink image to printing paper to complete the printed matter. When the ink image is transferred from the plate cylinder to the blanket cylinder, the dampening water of the plate cylinder is also transferred to the blanket cylinder.

The offset printing machine has a structure for cleaning the surface of the blanket cylinder. The surface of the blanket body must be cleaned each time the plate is replaced or foreign matter adheres to the surface of the blanket. Ink, paper dust, etc. are attached to the surface of the blanket. The ink is lipophilic. Paper dust and the like are rather hydrophilic. Paper dust and the like are a general term for fillers for printing paper such as paper dust and calcium carbonate that have been peeled off from the printing paper.

The ink adhering to the blanket body emulsifies when mixed with water. However, it is not soluble in water. A hydrocarbon solvent is suitable as the cleaning liquid for cleaning the ink. Inks are well soluble in hydrocarbon solvents. Paper dust and the like can also be softened to some extent with a hydrocarbon-based cleaning solution. However, the solvent may not soften sufficiently. Paper dust and the like soften quickly when soaked in water. If the ink, paper dust, etc. are dissolved or sufficiently softened, they can be easily wiped off with a cleaning cloth.

Patent Document 1 describes a blanket body cleaning device using a brush-type automatic cleaning device. The blanket body is cleaned with a rotating brush. Two types of a hydrophilic cleaning liquid and a lipophilic cleaning liquid can be selectively supplied to the rotating brush. The two types of cleaning liquids supplied to the rotating brush efficiently remove ink, paper dust, etc. adhering to the surface of the blanket body.

Patent Document 2 describes a blanket body cleaning device in which a cleaning cloth and a brush are used in combination. The blanket body cleaning device described here uses a dry cleaning cloth (dry cleaning cloth). The cleaning liquid is supplied to the cleaning cloth by a spray provided separately. The brush can be supplied with water.

Patent Document 3 describes a paper dust removing device for printing paper. This is not a blanket body cleaning device, but an attempt to remove dust from printing paper in advance. And dampening water is used to remove the paper dust.

Japanese Unexamined Patent Publication No. 2006-192870 Japanese Unexamined Patent Publication No. 2010-082834 JP-A-2009-226630

The conventional blanket body cleaning device has problems that it takes time to clean the blanket body and the structure becomes complicated. That is, although the ink adhering to the blanket body can be wiped off relatively easily with an impregnated cleaning cloth impregnated with a cleaning liquid such as a hydrocarbon in advance, it may take time to remove the paper dust and the like. Therefore, in order to remove paper dust and the like in a short time, it was considered to spray water, but the structure was complicated.

The present invention provides a method for cleaning a blanket cylinder, which can remove ink, paper dust, etc. adhering to the blanket cylinder in a short time without changing the configuration of a general offset printing machine.

In order to solve the above problems, the present invention provides a plate cylinder, a blanket cylinder, a dampening water supply mechanism for supplying dampening water to the plate cylinder, and a cleaning cloth for cleaning the surface of the blanket cylinder as needed. A method for cleaning the blanket cylinder of an offset printing machine, which comprises an automatic cleaning mechanism for cleaning by the above-mentioned plate. A dampening water transfer step of transferring the dampening water adhering to the body to the blanket body, a step of softening the paper dust accumulated on the surface of the blanket body by the transferred dampening water, and the automatic cleaning mechanism. The method for cleaning the blanket cylinder is characterized by comprising a step of cleaning the blanket cylinder with an impregnated type cleaning cloth impregnated with a cleaning liquid in advance.

Further, the method for cleaning the blanket body of the present invention is characterized in that the automatic cleaning mechanism starts a cleaning operation after the dampening water transfer step.

Further, the method for cleaning the blanket cylinder of the present invention is characterized in that the offset printing machine includes an ink supply mechanism, and includes a step of stopping the ink supply before the dampening water supply step. bottom.

Further, in the method for cleaning the blanket body of the present invention, when the dampening water supply mechanism supplies the dampening water for cleaning the blanket body, the amount of the dampening water supplied at the time of printing is larger than the amount of the dampening water supplied at the time of printing. It was characterized by supplying dampening water.

Further, the method for cleaning the blanket cylinder of the present invention includes a plate cylinder, a blanket cylinder, a dampening water supply mechanism for supplying dampening water to the plate cylinder, and a cleaning cloth for cleaning the surface of the blanket cylinder as needed. A method for cleaning the blanket cylinder of an offset printing machine including an automatic cleaning mechanism for cleaning and an ink supply mechanism for supplying ink to the plate cylinder. The printing paper is separated from the blanket cylinder and the ink supply mechanism is used. The supply of the ink is stopped, the dampening water is supplied to the plate cylinder by the dampening water supply mechanism, the dampening water adhering to the plate cylinder is transferred to the blanket cylinder, and the transferred dampening is performed. The feature is that the paper dust accumulated on the surface of the blanket cylinder is softened by water, and the blanket cylinder is cleaned by the automatic cleaning mechanism using an impregnated cleaning cloth impregnated with a cleaning liquid in advance.

In the present invention, only the cleaning method is changed without changing the configuration of the current offset printing machine. That is, an impregnated cleaning cloth impregnated with a cleaning liquid in advance is used for the automatic cleaning mechanism for cleaning the ink adhering to the blanket body, and dampening water is used for cleaning paper dust and the like. ..
As a result, the blanket body on which ink, paper dust, etc. are deposited can be washed in a short time.

It is explanatory drawing which shows the embodiment of this invention. It is explanatory drawing of the automatic cleaning mechanism. It is a flow chart of the cleaning method of a blanket body by this invention.

An embodiment of the present invention will be described with reference to FIG. FIG. 1 is an explanatory diagram showing an embodiment of the present invention. 1 shown in FIG. 1 is an offset printing machine. In general, an offset printing machine has various configurations even if the printing principle is the same. The offset printing machine 1 shown in FIG. 1 has a configuration assuming newspaper printing. 2 is a plate cylinder. Reference numeral 3 is a blanket body. Reference numeral 4 denotes a dampening water supply mechanism. Reference numeral 5 denotes an automatic cleaning mechanism.

Reference numeral 7 denotes an ink supply mechanism. Reference numeral 8 is printing paper. Reference numeral 9 denotes a back side blanket body arranged on the back side of the printing paper 8 facing the blanket body 3. The back side blanket cylinder 9 also has a configuration necessary for printing attached to the blanket cylinder 3 so that printing can be performed on both sides of the printing paper 8 at the same time, but is not shown.

When the printing paper 8 travels in the direction indicated by the arrow 10, the blanket cylinder 3, the plate cylinder 2, and the like rotate in the directions indicated by the arrows, respectively.

The dampening water supply mechanism 4 is composed of a spray 12 that sprays dampening water on the surface of the watering roller 11, and in many cases, a plurality of roller groups 13 of two or more. The dampening water sprayed from the spray 12 is formed into a uniform water film by the roller group, and is transferred to the surface of the plate cylinder 2 as a water film. The advantage of using the spray 12 as the source of the dampening water is that the adjustment range of the supply amount of the dampening water is wide. For example, the spray 12 can supply a small amount of dampening water at the time of printing and a large amount of dampening water at the time of cleaning the blanket body 3. In the present invention, the dampening water means water used for offset printing, and the composition of the components does not matter.

The ink supply mechanism 7 is composed of an ink pan 14 and an ink roller group 15. The ink is supplied from the ink pan 14. The ink roller group 15 composed of a large number of rollers supplies the ink supplied from the ink pan 14 to the plate cylinder 2 as a uniform ink film.

FIG. 2 is an explanatory diagram of the automatic cleaning mechanism. The automatic cleaning mechanism 5 can move forward and backward with respect to the rotating blanket body 3. The position shown in FIG. 1 is the forward position and indicates the cleaning state, and in FIG. 2, the position shown in FIG. 2 is the backward position and indicates the standby state. Reference numeral 16 is a cleaning pad. Reference numeral 17 denotes a washing cloth. Reference numeral 18 is a supply roll, and 19 is a take-up roll. The cleaning cloth 17 is supplied from the supply roll 18, passes between the cleaning pad 16 and the blanket body 3, and is wound by the winding roll 19. The automatic cleaning mechanism 5 presses the cleaning cloth 17 against the blanket body 3 by the cleaning pad 16 as needed.

As the cleaning cloth 17, an impregnated type cleaning cloth impregnated with a cleaning liquid in advance is suitable. The impregnated cleaning cloth can uniformly impregnate and hold the cleaning liquid over the entire cloth. The cleaning liquid is a solvent capable of dissolving the ink, and when the ink is an oil-based ink, a hydrocarbon-based cleaning liquid is preferable. When the cleaning cloth 17 is an impregnated cleaning cloth, the cleaning liquid needs to have a slow volatilization rate. Otherwise, the cleaning performance will change as it volatilizes.

FIG. 3 is a flow chart of a method for cleaning a blanket body according to the present invention. Step 20 is a step of starting the cleaning operation of the blanket body 3.
Step 21 is a preparation step, which is a paper release and ink stop step. The paper release is an operation of pulling the printing paper 8 away from the blanket cylinder 3 so that the printing paper 8 does not come into contact with the blanket body 3.

When the printing paper 8 is newspaper paper, there is a high possibility that it will break if it gets wet with dampening water. Therefore, when the printing paper 8 is newspaper paper, it is necessary to keep away from the blanket cylinder 3 while the dampening water for cleaning is present on the surface of the blanket cylinder 3. The operation of separating the printing paper 8 from the blanket cylinder 3 does not require a special mechanism, and can be realized by simply removing the printing paper 8 from the offset printing machine 1. The ink stop is an operation of stopping the ink supplied from the ink supply mechanism 7 to the plate cylinder 2.

However, depending on the material of the printing paper 8, even if the blanket body 3 is supplied with dampening water, the blanket body 3 may not be broken. Depending on the structure of the offset printing machine 1, the printing paper 8 is forcibly separated from the blanket cylinder 3 except for the printing operation. Further, even if the ink supply from the ink supply mechanism 7 is not stopped, the blanket body 3 may be cleaned. In this case, step 21 can be omitted. Further, the step 21 may not exist due to the structure of the offset printing machine 1.

Step 22 is a step of supplying dampening water to the plate cylinder 2. The dampening water supplied from the dampening water supply mechanism 4 is supplied to the surface of the plate cylinder 2. The amount of dampening water supplied from the dampening water supply mechanism 4 may be larger when the cleaning method of the present invention is carried out than at the time of printing.

Step 23 is a step of transferring dampening water from the plate cylinder 2 to the blanket cylinder 3. In this step, the dampening water transferred from the plate cylinder 2 to the blanket cylinder 3 also soaks into paper dust or the like on the surface of the blanket cylinder 3. If the printing paper 8 easily absorbs water like newspaper paper, it is necessary to separate the printing paper 8 from the blanket cylinder 3 or remove it from the offset printing machine 1.

Step 24 is a step of softening the paper dust or the like on the surface of the blanket body 3. This step can actually be achieved with an empirical timer. It suffices to soften the paper dust or the like on the surface of the blanket body 3 to the extent that it can be washed. For example, the time for continuing to supply the dampening water can be set as an empirical value from about 10 seconds to about 3 minutes.

Step 25 is a step of starting the operation of the automatic cleaning mechanism 5. At this time, the dampening water may continue to be supplied to the blanket cylinder 3, or the supply of the dampening water may be stopped if the paper dust or the like is sufficiently softened. Step 25 also includes removing the ink with an impregnated cleaning cloth as described in FIG.
Step 26 is the end of the cleaning method.

According to the cleaning method according to the present invention as described above, the cleaning effect is enhanced because the paper dust and the like on the surface of the blanket cylinder 3 are removed at an early stage without changing the configuration of the current offset printing machine. Therefore, not only the cleaning time can be shortened, but also the amount of the cleaning cloth used for one cleaning can be reduced.

1 Offset printing machine 2 Plate cylinder 3 Blanket cylinder 4 Water supply mechanism 5 Automatic cleaning mechanism 7 Ink supply mechanism 8 Printing paper 9 Back side blanket cylinder 11 Watering roller 12 Spray 13 Roller group 14 Ink pan 15 Ink roller group 16 Cleaning pad 17 Cleaning cloth 18 Supply roll 19 Winding roll

Claims (2)

A plate cylinder (2), a blanket cylinder (3), a dampening water supply mechanism (4) including a spray (12) for supplying dampening water to the plate cylinder (2), and a surface of the blanket cylinder are required. It is a method of cleaning the blanket body of the offset printing machine (1) provided with an automatic cleaning mechanism (5) for cleaning with a cleaning cloth (17) according to the above.
Steps to stop the ink supply and
The dampening water supply step of supplying the dampening water to the plate cylinder (2 ) by the spray (12) of the dampening water supply mechanism (4) and the dampening water adhering to the plate cylinder (2) are transferred. A dampening water transfer step to transfer to the blanket body (3), and
A step of softening the paper dust accumulated on the surface of the blanket body (3) by the transferred dampening water, and
A step of cleaning the blanket body (3) with an impregnated cleaning cloth (17) pre-impregnated with a cleaning liquid by the automatic cleaning mechanism (5).
And
When the spray (12) of the dampening water supply mechanism (4) supplies the dampening water for cleaning the blanket body (3), the amount of the dampening water supplied at the time of printing is larger than the amount of the dampening water supplied at the time of printing. A method of cleaning a blanket body, which comprises supplying dampening water. A plate cylinder, a blanket cylinder, a dampening water supply mechanism including a spray for supplying dampening water to the plate cylinder, an automatic cleaning mechanism for cleaning the surface of the blanket cylinder with a cleaning cloth as needed, and the plate. A method for cleaning the blanket cylinder of an offset printing machine equipped with an ink supply mechanism that supplies ink to the cylinder.
The printing paper is separated from the blanket cylinder, and the ink supply from the ink supply mechanism is stopped.
When the spray of the dampening water supply mechanism supplies dampening water to the plate cylinder, and the spray (12) supplies dampening water for cleaning the blanket cylinder, at the time of printing. Supply more dampening water than the dampening water supply,
The dampening water adhering to the plate cylinder is transferred to the blanket cylinder, and the dampening water is transferred to the blanket cylinder.
The transferred dampening water softens the paper dust accumulated on the surface of the blanket body, and the paper dust is softened.
A method for cleaning a blanket cylinder, which comprises cleaning the blanket cylinder with an impregnated cleaning cloth impregnated with a cleaning liquid in advance by the automatic cleaning mechanism.

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