JPS63222853A - Inking method for printing machine - Google Patents

Abstract

PURPOSE:To control the thickness of an ink film on the surface of a print paper freely at random printing speed, by forming a constant and uniform ink film with setting thickness onto an original roll, and providing a setting speed difference between the original roll and an adjoining roll. CONSTITUTION:When an original roll 15 is rotated, ink 13 is held on the surface of the original roll 15 and scooped up. The thickness of ink film on the original roll 15 is made constant and uniform by means of a doctor 14. Ink on the original roll 15 is transferred to a pass roll 16, and the thickness of ink film is determined by the speed difference between the pass roll 16 and the original roll 15. Ink on the pass roll 16 is transferred to a press plate on a doctor roll 17 and a plate cylinder 8 from where it is transferred onto a print paper 9 so as to make a print. Print density is determined by the thickness of ink film on the print paper 9, and the thickness of ink film can be controlled freely by controlling the rotary speed of the original roll 15.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an inking method applied to a printing unit of a flexo newspaper rotary press.

[Conventional technology]

Currently, there is no track record of flexible newspaper rotary presses in Japan, so we will explain the inking device and method for the printing unit of the flexible newspaper rotary press, which has been developed and commercialized mainly in the United States.

FIG. 5 shows a conventional inking device. In the figure, 1
is the ink management system, 2 is the ink supply pipe, 3 is the ink holder, 4 is the doctor blade, 5 is the anilox roll, 6 is the ink pan, 7 is the ink return pipe, 8 is the plate cylinder, 9 is the printing paper, 10 is the pressure It is the torso.

In such a device, the ink sent from the ink management system 1 is transferred to the ink supply pipe 2.
The ink holder is supplied to the ink holder 3 through the ink holder, and the ink holder is supplied with two blades of grade 4, and these two blades are connected to the contact pressure on the anilox roll 5 as shown in Figure 3. An ink chamber 11 is formed by the ink brought into contact with the ink, and the ink from the ink supply pipe 2 is supplied to this ink chamber, and the amount of ink necessary for printing is supplied to the anilox roll 5. Excess ink sent to the ink chamber overflows from the end of the ink chamber to the ink tank 6 and is sent through the ink drain 9 piping 7 to be recycled back to the ink management system IIC. The ink for Anilox Roll 5 is
The printing paper 9 that is supplied to the printing plate on the adjacent printing cylinder 8 and runs between the impression cylinder 10 and the printing cylinder 8 is printed in correspondence with the pattern of the printing plate.

Here, the amount of ink printed on the printing paper 9 is determined according to the amount of ink supplied to the anilox roll 5. Here, the roll outer surface of the anilox roll 5 is formed with depressions (concavities) such as a pyramid shape or a lattice shape in the case of a mechanical processing method, and a scale shape or a round hole in the case of an electric discharge machining method and a laser processing method. , the number is per inch)
There are 300 to 450 pieces. The unit area of the dent υ
The volume of is approximately 2.4-3.5 Xl09μ3/lNCH2
Then, the amount of printing ink on the printing paper 9 is determined in accordance with the amount of ink corresponding to the volume of the dent.

In other words, in the conventional method, the volume of the indentation on the outer surface of the anilox roll is determined to a certain value at the time of designing the anilox roll, so the amount of ink printed on the printing paper 9, that is, the printing density, is determined by the rotary press. I couldn't control it.

Conventionally, the ink management system 1 includes an automatic ink concentration adjustment device that changes the amount of water in the ink, that is, changes the ink composition and viscosity. Even if the amount of ink is the same, the print density on the printing paper is controlled by changing the proportion of pigment in the ink. A newspaper rotary press has a large number of printing units, and in this inking management system, one system is connected to a large number of printing units.

[Problem that the invention seeks to solve]

(1) Conventional flexo newspaper rotary presses have problems such as requiring an expensive ink management system because the print density on the printed paper cannot be controlled by the rotary press itself. The reason for this is as follows: Since the conventional inking system is anilox inking, the amount of ink on the paper is constant and cannot be controlled. Therefore, in order to control the print density on paper, conventional methods have been to control K and the amount of water in the ink composition.

Therefore, an expensive ink management system including an automatic ink density adjustment device is required.

(2) In the conventional method of controlling the amount of water in the ink composition in order to control the printing density on the paper surface, it takes time to control the printing density to a certain setting, and a large amount of waste paper is generated. The problem is gone.

[Means for solving problems]

(1) Form an ink film that is constant and uniform in the axial direction with a set thickness on the original roll for any rotational speed of the original roll.

(2) Give a 6 set value 0 speed difference to the same speed between the original roll and the roll adjacent to the original roll. (3)
The thickness of the ink film supplied from the original roll is divided into arbitrary ratios to form an ink film uniform in the axial direction and having an arbitrary thickness on adjacent doctor rolls.

[Effect]

(1) The ink film thickness on adjacent rolls is a function of the speed difference between the adjacent rolls and the original roll.

(2) By controlling the rotation speed of the original roll, the ink film thickness on the original roll and the adjacent roll can be controlled.

(3) History remains on the surface of the ink film on the doctor roll after the ink is supplied to the plate cylinder, but when using water-based flexographic ink with low viscosity, the history remains between the doctor roll and the delivery. Because the ink flows in the width direction (roll axis direction) due to the printing pressure between the rolls, the history is eliminated.

(The vI4m device is not required.) (4))' It is only necessary to supply ink uniformly in the width direction to the lid roll, and there is no need to consider the ink distribution in the width direction.

(5) According to items (1) to (4) above, the thickness of the printing ink film on the printing paper surface can be controlled to an arbitrary thickness.

In other words, the rotary press can now control the thickness of the printing ink on the printed paper at any printing speed from high to low, making it possible to control the printing density to any desired level. .

1st Embodiment In FIG. 1, 8 is a plate cylinder, 9 is a printing paper, 10 is an impression cylinder, 12 is an ink pan, 13 is printing ink, 14 is a doctor, 15 is a source roll, 16 is a delivery roll, 17 is a It's a doctor roll.

In such an apparatus, the source roll 15 is immersed in the printing ink 13 in the ink nozzle 12 and pumps up the ink. The rotational speed of this original roll 15 can be arbitrarily changed independently of the printing speed of the printing machine.

The doctor 14 is adjacent to the original roll 15 and maintains a predetermined gap with the outer surface of the original roll. The delivery roll 16 splits the ink on the original roll 15 into an arbitrary ink film thickness.

The doctor roll 17 receives ink from the transfer roll 16 and supplies the ink to the printing plate on the plate cylinder 8.

Next, the operation of this device will be explained.

When the original roll is driven and rotated, the ink is held directly in front of the original roll and pumped up.

The doctor 14, which is adjacent to the original roll 15 and holds the six outer sides of the original roll and a certain gap (0,1=0.8xg), ink on the original roll after the same 9th point. Since the film thickness is constant, it is possible to make the film thickness uniform in the axial direction.

The amount of ink on the original roll from the ink pan 12 at the tractor 141 increases almost correspondingly to the rotational speed of the original roll, but the thickness of the ink film passing through the gap of the doctor 14 has no relation to the rotational speed of the original roll 150. It can be kept constant. (The ink film thickness is determined only by the gap of the doctor 14.) Excess ink on the original roll 15 is returned to the ink pan 12.

Next, there is a delivery roll 16 adjacent to the original roll 15, and the ink on the original roll that has passed through the doctor 14 is transferred to this delivery roll 16. Here, the thickness of the ink film transferred to the delivery roll 16 is determined by the speed difference (speed ratio) between the delivery roll 16 and the original roll 15. The delivery roll 16 is rotated with the r-cover four 17, and since the speed is the same as the printing speed, the ink film thickness on the delivery roll 16 is controlled by controlling the rotation speed of the original roll 150. I can do things.

The ink on the delivery roll 16 is uniformly transferred to the doctor roll 17 adjacent to the delivery roll 16, and then transferred to the printing plate on the plate cylinder 8 in contact with the doctor roll 17.

The ink on the printing plate is transferred to a printing paper 9 running between the plate cylinder 8 and an adjacent impression cylinder 10, and printing is performed.

At this time, the ink film thickness on the printing paper 9 determines the degree of printing, but as described above, by controlling the rotational speed of the original roll 15, the ink film thickness on the printing paper can be arbitrarily controlled. .

That is, the printing density can be arbitrarily controlled at any printing speed.

After the ink on the doctor roll 17 is supplied to the printing plate on the plate cylinder 8, a hysteresis surface is formed and the ink film thickness becomes non-uniform. When using ink with high ink viscosity in 0FFSET printing, letterpress printing, or flexo printing, use the K11 mechanism (specifically, the mechanism that presses the doctor blade against the doctor roll) adjacent to the doctor roll 17. It is necessary to make the residual ink on the history surface a uniform thickness, but if low viscosity ink (approximately 1 poise or less) is used in 7 Lexo printing, it is not necessary to make the residual ink on the history surface a uniform thickness. . The reason for this is that the ink newly supplied from the delivery roll and the unused ink on the doctor roll are spread in the width direction (axial direction) due to the printing pressure between the doctor roll 17 and the delivery roll 16. This is because the flow has the effect of eliminating the history aspect.

When ink with high viscosity is used for 0FFSET printing, letterpress printing, etc., since the above-mentioned effect does not exist, it is necessary to make the residual ink a uniform film thickness, and an adjustment mechanism is required.

Second example FIG. 2 shows a second embodiment.

The second embodiment has a roll arrangement in which the delivery roll 16 is removed from the first embodiment.

In the first embodiment, in order to keep the gap between the original roll 15 and the doctor 14 constant during operation, it is practical to use a metal roll as the original roll due to the relationship between the roundness of the outer surface of the original roll and the roll axis runout. will be adopted.

This made it possible to keep the ink film thickness on the original roll after the doctor constant.

On the other hand, in the second embodiment, for the purpose of cost reduction, a roll made of a material such as hard rubber is used as the base roll 15, and the roundness and roll axis runout are made to be the same as the metal roll. Alternatively, the same effect as in the first embodiment can be achieved even if the transfer roll 16 is omitted. Since there are a large number of printing units in the entire printing press system, adopting the format of the second embodiment greatly contributes to cost reduction.

Note that since the doctor roll 17 is a metal roll, for example, a hard chrome-plated metal roll, the base roll 15 of the second embodiment cannot be a metal roll.

Third embodiment FIG. 3 shows a third embodiment.

The third embodiment has a structure in which a V4 adjustment mechanism 18 is added to the doctor roll 17 of the first embodiment.

The functions of each member 8 to 17 are the same as those in the first embodiment, so a description thereof will be omitted.

After the ink on the doctor roll 17 is supplied to the printing plate on the plate cylinder, a hysteresis surface is formed and the ink film thickness is non-uniform. This is done by an adjustment mechanism 18 adjacent to the doctor roll 17 (specifically, a doctor blade is brought into pressure contact with the doctor roll) to make the residual ink on the hysteresis surface of the doctor roll uniform in film thickness.

The ink from the delivery roll 16 is transferred onto this uniform film thickness, so that the printing plate on the plate cylinder 8 is always supplied with a uniform ink film thickness.

Fourth example FIG. 4 shows a fourth embodiment.

The fourth embodiment has a roll arrangement in which the delivery roll 16 is removed from the third embodiment.

In the third embodiment, in order to keep the gap between the original roll 15 and the doctor 14 constant during operation, it is practical to use a metal roll as the original roll due to the relationship between the roundness of the outer surface of the original roll and the roll axis runout. will be adopted.

This made it possible to keep the ink film thickness on the original roll after the doctor constant.

On the other hand, in the fourth embodiment, for the purpose of cost reduction, a roll made of a material such as hard rubber is used as the base roll 15, and the roundness and roll axis runout are made to be the same as the metal roll. Even if the transfer roll 16 is omitted, the same effect as in the third embodiment can be achieved.

Since there are many printing units in a complete printing press system,
The format of the fourth embodiment greatly contributes to cost reduction.

Note that since the r-lid roll 1f is a metal roll, for example, a hard chrome-plated metal roll, the base roll 15 of the fourth embodiment cannot be a metal roll.

〔Effect of the invention〕

(1) It is possible to arbitrarily control the ink film thickness on the printed paper surface at any printing speed.

(2) Therefore, the printing density on the printing paper surface can be controlled arbitrarily.

(3) Therefore, ink density automatic i! 141i equipment becomes unnecessary.

[Brief explanation of drawings]

Fig. 1 shows the roll arrangement in the first embodiment of the inking method of the printing press of the present invention, Fig. 2 shows the roll arrangement in the second embodiment, Fig. 3 shows the roll arrangement in the third embodiment, and the roll arrangement in the fourth embodiment.
The figure shows the roll arrangement in the fourth embodiment, and FIG. 5 shows the roll arrangement in the conventional device. 8... Plate cylinder 9... Printing paper 10...
8JM 12... Ink pan 13...
Printing ink 14...Doctor 15...Original roll 16...Delivery roll 17...To9 doctor roll Figure 1 15-Unit roll 16--Delivery roll +7
-F Geter Roll Figure 2

Claims (1)

[Claims] In a flexographic rotary press that uses water-based ink, an ink film is formed on the original roll at a set thickness, constant, and uniform in the axial direction for any rotational speed of the original roll, and By giving a speed difference of a certain set value to the rotational speed between the adjacent rolls, the ink film thickness supplied from the original roll can be divided into arbitrary ratios, and the ink film thickness can be uniformly distributed in the axial direction on the adjacent doctor rolls. An inking method for a printing press, characterized in that an ink film of arbitrary thickness is formed.