JPH04112043A - Lithographic rotary press for multicolor printing - Google Patents

Abstract

PURPOSE:To obtain a print, in which printing elements printed by each printing section are matched superiorly and which has excellent quality, by providing a water supply means supplying travelling writing paper with liquefied water and two or more of printing sections disposed at a position where writing paper passed through the water supply means is passed. CONSTITUTION:Web writing paper W is passed on the travelling path of web writing paper W between water supply means 1, 1', and passed successively through printing sections P1-P4. A rotary press is started and web writing paper is made to travel, each printing section P1-P4 is printing-operated, the water supply means 1, 1' are operated in conformity with the printing operation of each printing section P1-P4, and water is fed simultaneously toward both faces of web writing paper W from each nozzle 12, 12...of the water supply nozzles 11, 11'. The quantity of water supply is adjusted by regulating the openings of the nozzles 12, 12.... Web writing paper W supplied with water is stretched extremely quickly and stabilized, and first-fourth printing elements are printed under a matched state by the printing sections P1-P4 during a time when web writing paper W communicates successively and passed through the printing sections P1-P4.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a lithographic rotary printing press, and more specifically, it has two or more printing sections, and a web printing paper that passes through these printing sections in succession, This invention relates to a lithographic printing machine for multi-color printing, in which the printing sections print sequentially and continuously.

(Prior Art) A lithographic rotary printing press for multicolor printing has a plate cylinder P as shown in FIG.
It is known that a printing section P is constructed by arranging two sets of a blanket cylinder BC and a blanket cylinder BC one above the other so that the respective blanket cylinders BC can be pressed against each other. In this lithographic rotary printing press for multicolor printing, four printing units P are installed side by side, and the web paper W runs approximately horizontally and is sequentially passed between blanket cylinders BCSBC that are pressed together to print on both sides of the web paper W. It is something to do. Alternatively, if you use another conventional planographic rotary printing press for multicolor printing, you can use a plate cylinder PC as shown in Figure 4.
4 sets of blanket cylinders BC and a common impression cylinder I around a common impression cylinder IC.
It is known that the printing parts P are arranged so as to be able to come into pressure contact with each other. In this lithographic rotary printing press for multicolor printing, the web paper W is wound around the circumferential surface of the common impression cylinder IC, and as the common impression cylinder IC rotates, the space between the common impression cylinder IC and each blanket cylinder BC pressed against it is The printing paper W is printed on one side of the web paper W by passing the printing paper W sequentially.

Furthermore, in recent years, for example, as newspaper printing has become more multi-colored, there has been a growing demand for multi-page, multi-colored, large-volume printing within a limited installation space. Diagram 5 of the rotary printing press (
Plate cylinder PC and blanket cylinder B as shown in a) and (b)
Two sets of combination C, each blanket cylinder BC
are arranged on the left and right sides so as to be press-contactable to form a printing section P, and a system in which four printing sections P are stacked and installed is disclosed. In this conventional lithographic rotary printing press for multicolor printing, the web paper W is made to run approximately vertically, and the blanket cylinders BC, BC are brought into pressure contact with each other.
The paper is printed on both sides of the web paper W by sequentially passing through the paper (for example, INCA-FIEJ Re5ear
IFRA Newspaper Technique published by ch As5ocation (INH Research Association)
es English Edition 1988. APRIL's 64
(See pages 73 to 73).

On the other hand, a device for supplying moisture to the paper web before printing in a rotary printing press is described, for example, in Japanese Patent Publication No. 47-6845, ``Device for Controlling Constant Humidity,'' Publication No. 1, Japanese Patent Publication No. 47-800.
No. 6 ``Device for controlling humidity to be applied to a constant level'' publication and Japanese Patent Publication No. 47-8007 ``Device to control humidity to be applied to a constant level'' are publicly known. atomized vapor is applied to the web stock paper before printing by electrostatic means, and the humidity of the stock paper is measured and adjusted to about 8 to 12%;
The purpose is to improve the adhesion of printing ink and prevent the occurrence of tears during cutting.

(Problems to be Solved by the Invention) Web paper is generally made by dispersing beaten pulp fibers in water, dehydrating and drying the fibers, and bonding the fibers to each other by hydrogen bonding. Since the valve fibers change in size by about 1% in the length direction and by about 20 to 30% in the diameter direction due to moisture absorption or water supply, the web stock expands in the width and length directions due to moisture absorption or water absorption. In particular, in web stock paper, many fibers are arranged in the length direction of the web paper due to mechanical papermaking, so that the web paper stretches greatly in the width direction.

Comparing the elongation due to moisture absorption and the elongation due to water absorption,
When water is absorbed, that is, when liquid water is applied to the paper web, the bonds between the fibers are loosened or broken, and the water enters between the fibers. Therefore, when water is absorbed, the area of the web-based paper itself expands compared to when moisture is absorbed, that is, when vaporized water is applied to the web-based paper, and as a result, the elongation of the web-based paper increases; occurs in a very short time and is stable.

For this reason, lithographic printing, especially lithographic printing that uses dampening water,
When the web paper passes through the printing section, images are printed on it, water is added to it and it stretches, and the images printed on it also deform as it stretches. Therefore, in a lithographic rotary printing machine for multicolor printing in which lines are successively printed on the same web paper by two or more lithographic printing units using dampening water, for example, the above-mentioned Japanese Patent Publication No. 47-6845, Japanese Patent Publication No. 47-8006, Even if atomized steam is applied to the web paper before printing using a device such as that shown in Japanese Patent Publication No. 47-8007, the lines printed in the first printing section and the lines printed in the second and subsequent printing sections will be different. There was a problem in that the printed image lines did not match, making it impossible to obtain printed matter of good quality.

This invention provides that even when printing lines successively on the same web paper by two or more lithographic printing units that use dampening water as described above, the problem is caused by the stretching and spreading of the web paper caused by moisture absorption or water absorption. The purpose of this method is to eliminate misalignment of printed lines and to obtain high-quality printed matter in which the lines printed by each printing unit are well matched.

(Means for Solving the Problems) This invention provides a planographic rotary press for multicolor printing with a water supply means for supplying liquid water to running paper, and a position where the paper passing through the water supply means successively passes. In order to achieve the above object, the printer is configured to have two or more printing units disposed in the printer.

(Function) According to the configuration of the present invention, the water supply means supplies liquid water to the web paper traveling toward the printing section when the web paper passes therethrough. This application of water causes the web paper to stretch, spread, and become stable.

Each of the printing sections provided at a position where the web stock paper passing through the water supply means passes in sequence, first prints a first drawing line on the web paper paper passing through the first printing section. At this time, even if the printing section prints lines and applies dampening water to the web paper, the web paper remains stable in its stretched and expanded state due to the application of water supplied by the water supply means, so that the web paper remains stretched and expanded. Moreover, it does not spread, and therefore, the printed lines are not deformed.

The second and subsequent printing units sequentially print the second and subsequent drawing lines in alignment with the previously printed drawing lines on the web paper that passes there sequentially.

Example) Next, regarding the example of this invention, the first example will be described.
This will be explained with reference to FIG. 2(a) to FIG. 2(j). 1st
Figure (a) shows two sets of combinations of plate cylinders PC and blanket cylinders BC, each of which has a plate cylinder PC and a blanket cylinder BC, similar to the lithographic rotary printing press for multicolor printing explained in the prior art and shown in Figure 5 (b). The BCs are arranged on the left and right so that they can be pressed into contact with each other to form printing sections P1, Pl, P3, and P4, and these printing sections P1,
Install Pl, P3, and P4 one on top of the other. Furthermore, the overlapping printing 1iJPl in the running direction of the web paper W,
A water supply means (1
), (11-) are provided on both sides of the running path of the web paper 100.

The water supply means (1), (1)'' shown in FIG. 1(a) are water supply nozzles (11
), (11)-. Water supply nozzle (11), (11
)-, as shown in the perspective view of the water supply nozzle (11)- in FIG.・ Consists of bars (13) arranged in the width direction of the web paper W.

(In the figure, IN indicates an ink supply section, and DP indicates a dampening water supply section.

In the configuration of the above embodiment, the web paper W is passed through the running path of the web paper W between the water supply means (1) and (1), and then the printing parts P1, Pl, P3, and P4 are sequentially and consecutively passed. Thread the paper so that it passes through.

Then, the rotary printing press is started to run the web paper, and each printing section PL, Pl, P3, P4 is put into printing operation, and the water supply means (1 ), (1)'', and the water supply nozzles (11), (11)-'s respective spout ports (12), (
12) Water is supplied all at once to both sides of the running web paper W. To adjust the amount of water supplied, use the spout (1
2), (12)... Adjust the opening degree.

The web paper W supplied with water by the water supply means (1) and (1)' expands and becomes stable very quickly, continues to run, and passes through the printing sections P1 to P4 one after another. The fourth to fourth drawing lines are printed in tight alignment by the respective printing units P1 to P4.

In the configuration described above, the water supply means (1), (1)' can be replaced with various configurations as shown in FIG. 2(a) to FIG. 2(j), for example. Figure 2 (a) below
The structure and operation of each water supply means (1) to (D) will be explained.In addition, in FIG. 2(a) to FIG. The approximate range is indicated by a two-dot chain line, and detailed illustration thereof is omitted.

The water supply means +11 shown in FIG. 2(a) is provided with flat plates (21) rotatably supported and arranged in parallel in the width direction of the web paper W, as its plan view is shown in FIG. 2(b). This flat plate (21
) is supplied with water through a water supply pipe (22) and rotated by a motor (23) and a transmission belt (24).

Water is blown toward the web paper W by centrifugal force. The amount of water supplied is adjusted by adjusting the amount of water discharged from the water supply pipe (22).

The water supply means (1) shown in FIG. 2(C) is partially immersed in water stored in a water boat (3I) and a water boat (31) extending along the width direction of the web paper W, and is driven. It consists of a water head roller (32) that rotates, and a bran roller (33) that presses the ends of the hair against the water head roller (32) and rotates slightly faster than the water head roller (32). The water drawn out from the water boat (31) by the circumferential surface of the water head roller (32) is blown toward the web paper W by the elasticity of the brush bristles. The amount of water supplied is adjusted by adjusting the rotation speed of the water source roller (32).

The water supply means (1) shown in FIG. 2(d) is partially immersed in water stored in a water boat (41) extending along the width direction of the web paper W, water boat (4I), and driven. a rotating brush roller (42) and a rotating brush roller (42)
) consists of a flicker blade (43) that deflects the bristles of the brush. The water retained in the bristles of the brush roller (42) is blown away toward the web paper W by the elasticity of the bristles. The amount of water supplied is adjusted by adjusting the rotation speed of the brush roller (42).

It can also be adjusted by adjusting the opening degree of the shutter (44).

The water supply means (1) shown in FIG. 2(e) is a water boat (51) extending along the width direction of the web paper W, and is partially immersed in water stored in the water boat (51) and driven. It has a mesh roller (52) that rotates and a blow pipe (53) that blows airflow from the inside of the mesh roller (52) toward the mesh of the mesh roller (52), and water is retained in the mesh of the mesh roller (52). The water is blown away towards the web paper W by the air current. To adjust the water supply amount,
This is done by adjusting the rotation speed of the mesh roller (52). It can also be adjusted by adjusting the opening degree of the gloss tar (54).

The water supply means (1) shown in FIG. 2(f) is a water boat (61) extending along the width direction of the web paper W, and is partially immersed in water stored in the water boat (61) and driven. A water head roller (62) that rotates and a water head roller (62) that is close to or in contact with the water head roller (62) and also contacts the web stock paper W, and is driven or driven by and rotates at approximately the same circumferential speed as the running speed of the web stock paper W. It consists of a water supply roller (63). Then, the water led out from the water boat (6I) by the circumferential surface of the water source roller (62) is transferred to the web paper W via the water supply roller (63). To adjust the amount of water supplied, use the water source roller (6
This is done by adjusting the rotation speed in step 2). A suitable number of intermediate rollers (not shown) may be interposed between the water source roller (62) and the water supply roller (63).

The water supply means (1) shown in FIG. 2(g) is a water boat (71) extending along the width direction of the web paper W, and is partially immersed in water stored in the water boat (71) and driven. a pickup roller (73) that swings toward and away from the water base roller (72) and comes into contact with the intermediate roller (74) when separated from the water base roller (72); and a water supply roller (75) that is in contact with the intermediate roller (74), contacts the web paper W, and rotates at a circumferential speed that is approximately the same as the running speed of the web paper W. The water led out from the water boat (71) by the circumferential surface of the original roller (72) is transferred to the web material H via the pickup roller (73), intermediate roller (74) and water supply roller (75). It is something. To adjust the amount of water supplied, use the water source roller (7
This is done by adjusting the rotation speed in step 2).

In addition, the pickup roller (73) and the water supply roller (7
5) may be constructed by increasing or decreasing the number of intermediate rollers (74) provided between the intermediate rollers (74) and the intermediate rollers (74) by an appropriate number.

The water supply means (11) shown in FIG. 2(h) is a water boat (81) extending along the width direction of the web paper W, a part of which is immersed in water stored in the water boat (81), and is driven. A rotating flap roller (82), a water supply roller (83) that contacts the web paper W and rotates driven or driven at a circumferential speed that is approximately the same as the running speed of the web paper W, the flap roller (82), and the water supply roller. (83), and has an intermediate roller (84) interposed between the flap roller (82) and the flap roller (82).
) The water led out from the water boat (81) by the flap is transferred to the web paper W via the intermediate roller (84) and the water supply roller (83).

The amount of water supplied is adjusted by adjusting the rotation speed of the flap roller (82). Flap roller (82)
and an intermediate roller provided between the water supply roller (83) and the water supply roller (83).
(84) may be increased or decreased by an appropriate number.

The water supply means (1) shown in FIG. 2(i) is a water storage tank (92) that extends along the width direction of the web paper W and is provided with an appropriate number of water supply ports (9) along this extending direction.
), a water supply roller (93), a water supply roller (93), a water supply roller (93), and a water supply port (9
1) has an auxiliary roller (94) that contacts near the water supply roller (93) and stores water in a depression formed by the outer circumferential surface of the water supply roller (93) and the outer circumferential surface of the water supply roller (93) and is driven to rotate;
Water supplied from a water storage tank (92) through a water supply port (91) to the depression and stored therein is transferred to the web paper W by a water supply roller (93). The amount of water supplied is adjusted by adjusting the rotation speed of the auxiliary roller (94). An appropriate number of intermediate rollers (not shown) are interposed between the water supply roller (93) and the auxiliary roller (94), and the depression for storing water is formed between the auxiliary roller (94) and the water supply roller (93).
94) and an intermediate roller (not shown).

The water supply means (1) shown in Fig. 2 (D) is shown in Fig. 1 (a), (
The water supply nozzle (11) shown in b), whose peripheral surface is the water supply nozzle (l
1) facing the jet ports (12), (12)... and in contact with the web stock paper W, and is driven or driven to rotate at approximately the same circumferential speed as the running speed of the web stock paper W. The water supply roller (15) and its circumferential surface are in contact with the circumferential surface near the circumferential surface facing the jet ports (12), (12), etc. of the water supply roller (15), and the circumferential surface of the water supply roller (15) and an auxiliary roller (I6) that is driven or driven to rotate at approximately the same circumferential speed as the speed. And the water supply nozzle (11)
The water supplied from the spout ports (12), (12) and the river is transferred to the web paper W via the water supply roller (15). To adjust the amount of water supplied, see Figure 1 (
Similar to those shown in a) and (b), the spout (12), (
Perform this by adjusting the opening degree of I2)...

An appropriate number of intermediate rollers (not shown) are interposed between the water supply roller (15) and the auxiliary roller (16), and the water supply from the water supply nozzle (11) is transferred to the auxiliary roller (16).
It is also possible to adopt a configuration in which the water supply nozzle (16) is received by the water supply nozzle (
11) may be configured such that only the water supply roller (15) receives the water supply from the water supply roller (11).

Furthermore, the structure shown in FIG. 2(j), the structure shown in FIG. 2(j) with an intermediate a-roller interposed, or the structure shown in FIG. 2(D) without the auxiliary roller (I6) In the water supply means, instead of the water supply nozzle (11),
The structure shown in FIGS. 2(a) and 2(b), the structure shown in FIG. 2(c), the structure shown in FIG. 2(d), or the structure shown in FIG. 2(e) may be provided.

Furthermore, it is not necessary that the water supply means (1) and the water supply means (I) have the same configuration, and the water supply means (1) or the water supply means (
Only one of 1)' may be provided to supply water to the web paper W.

In any case, the present invention is not limited to the embodiments described above, but includes design modifications that do not depart from the scope of the claims.

(Effect) By carrying out the present invention, even when printing lines on the same web paper one after another by two or more lithographic printing units that use dampening water, the web can be printed before reaching the first lithographic printing unit. Water is added to the paper to stretch and expand the web paper, and printing is performed sequentially from the first printing section after it becomes dimensionally stable, so the web generated by water being supplied at the same time as printing at the first printing section during the printing run. It is possible to eliminate misalignment between the first printed line and subsequent printed lines caused by the stretching and spreading of the paper. Therefore, it has become possible to obtain printed matter of good quality.

[Brief explanation of the drawing]

FIG. 1(a) is a front view showing a schematic configuration of the present invention, FIG. 1(b) is a perspective view showing one side of the water supply means shown in FIG. 1(a), and FIG. 2(a) to Figure 2 (D is Figure 1 (a)
and a front view showing a schematic configuration of a water supply means that is different from the water supply means shown in FIG. It is a diagram showing only the range with a chain line. FIG. 2(b) is a view taken along the line BB in FIG. 2(a). FIG. 3, FIG. 4, FIG. 5(a), and FIG. 5(b) are front views showing the schematic configurations of different conventional lithographic rotary printing presses for multicolor printing. (1), (1)゛... Water supply means, (11), (
II) '...Water supply nozzle, (I2)...
...Spout port, (I3)...Bar, (15)...
... Water supply roller, (16) ... Auxiliary roller (21) ... Flat plate, (22) ...
Water supply pipe, (23)...Motor, (24)...
...Transmission belt, (3I) ...Mizifune, (3
2)... Mizumoto roller, (33)...
Brush roller (41)... Mizifune, (42).
... Brush roller, (43) Flicker blade, (44) ... Shutter, (51) ...
...Mizifune, (52) ...Mesh roller, (5
3)... Fumarole pipe, (54)... Shutter, (61)... Mizifune, (62)...
・Water source roller, (63)...Water supply roller (
71)...Mizifune, (72)...Mizumoto roller, (73)...Pickup roller,
(74)...Intermediate roller, (75)...
...Water supply roller, (81) ...Mizifune, (82
)...Flap roller, (83)...
・Water supply roller, (84)...Intermediate roller,
(91)...Water supply port, (92)...Water storage tank, (93)...Water supply roller (94)
...Auxiliary rollers P, Pi, P2, P3, P4...Printing section,
pc...Plate cylinder, BC...Blanket cylinder, Ic
... Impression cylinder (common impression cylinder), IN ... Ink supply section, DP ... Dampening water supply section, W ... Web paper

Claims (1)

[Claims] A lithographic plate for multicolor printing characterized by having a water supply means for supplying liquid water to running paper, and two or more printing units disposed at positions where the paper passing through the water supply means successively passes. Rotary printing press.