JPH0747657A - Multicolor printer - Google Patents

Abstract

PURPOSE:To minimize the shift between colors of multicolor printing due to the lateral stretching and expansion of paper, to reduce the transfer inferiority of post-printing ink and to reduce or dispense with applied energy in a drying process being a post-process. CONSTITUTION:When printing paper 101 with moisture conditioned to about 8% at the time of the delivery from a papermaking factory with the view of antistatic effect enters printing units 102, 103 or while passing through the printing units, the printing paper 101 is dehumidified by a dehumidifying means 1 and increased in strength to minimize the shift between colors of multicolor printing due to the lateral stretching and expansion of the printing paper. The absolute value of the water content of printed paper is lowered to reduce the transfer inferiority of post-printing ink and the applied energy in a drying process being a post-process is reduced or dispensed with.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a double-sided 4-color newspaper rotary printing press, and more particularly to a multi-color printing press applicable to newspaper offset rotary presses for printing uncoated, medium-quality or thin paper, commercial offset rotary presses, and the like. It is a thing.

[0002]

2. Description of the Related Art A conventional multicolor printing machine will be described with reference to FIG.
The first color ink is transferred to both sides of the printing paper 101 by passing through the color printing units 102 and 103, and then the second color ink is transferred to both sides of the printing paper 101 through the second color printing units 104 and 105. Similarly, the third and fourth color inks are transferred to both surfaces of the printing paper 101 by passing through the third color printing units 106 and 107 and the fourth color printing units 108 and 109, and multicolor printing is performed. Complete.

[0003]

The conventional multicolor printing machine shown in FIG. 10 has the following problems. That is, the printing paper 101 moves in the paper flow direction and the paper width direction due to the influence of the nip pressure when passing through the printing unit, the strength of the paper used, and the strength decrease or expansion due to the penetration of dampening water in the offset printing. It causes a slight elongation. The amount is about 1 mm
It is said to be back and forth.

Of these, the elongation in the paper flow direction can be corrected by a conventionally known mechanism for adjusting the paper flow direction. However, since the elongation amount in the paper width direction varies depending on the position in the width direction, the entire width of the cylinder is equal to the paper width. It cannot be adjusted by the conventional paper width direction register adjusting mechanism that moves in the direction. Therefore, for example, when two-sided four-color printing is performed using newspaper, a difference in expansion of about 1 mm occurs between the first color and the fourth color near both ends in the width direction of the paper, and the printed matter has a register of each color in the paper width direction. There was a problem that it would be unclear and unclear.

FIG. 11 shows a state in which a multicolor overlapping pattern on a multicolor printed sheet is displaced in the paper width direction. 121 is a first color pattern, 122 is a second color pattern, and 123 is a pattern. Is a pattern of the third color, 124 is a pattern of the fourth color, A is an expansion difference in the paper width direction between 1 and 2 colors, B is an expansion difference in the paper width direction between 2 and 3 colors, and C is between 3 and 4 colors. Is the difference in expansion in the paper width direction. Further, FIG. 12 shows a state in which the alignment marks on the printing paper on which multicolor printing has been performed are displaced in the paper width direction. 131 is a first color alignment mark, 132 is a second color alignment mark, and 133 is a third color. Color matching mark,
Reference numeral 134 is the alignment mark of the fourth color.

The present invention is proposed in view of the above problems, and an object of the present invention is to minimize the deviation between colors in multicolor printing due to expansion and expansion in the paper width direction. Another object of the present invention is to provide a multi-color printing machine which can reduce transfer defects of the post-printing ink and can reduce or eliminate additional energy in a drying step which is a post-step.

[0007]

In order to achieve the above-mentioned object, a multicolor printing machine of the present invention is a multicolor printing machine comprising a plurality of printing units, the upstream side of the printing unit and each printing unit. Dehumidifying means for removing the water content of the printing paper is provided in at least one of the spaces. The dehumidifying means may be divided in the paper width direction so that each can be independently controlled.

The dehumidifying means may be composed of an electric heater. The dehumidifying means may be composed of an infrared heater heating device. The dehumidifying means may be configured by an air blowing device that discharges air at room temperature or high temperature. The dehumidifying means may be composed of a high frequency dielectric heating device.

The dehumidifying means may be composed of an ultrasonic heating device. The dehumidifying means may be composed of a heating roll pressure contact type heating device.

[0010]

The multi-color printing machine of the present invention is constructed as described above, and the printing paper whose humidity is adjusted to about 8% enters the printing unit for the purpose of preventing static electricity when shipped from the paper mill. At this time, or while passing through the printing unit, dehumidification is performed by the dehumidifying means to increase the strength of the printing paper, and the deviation between the colors in multicolor printing due to expansion, expansion, etc. in the paper width direction is minimized. Further, the absolute value of the water content of the printed paper is lowered to reduce the transfer failure of the post-printing ink, and the additional energy in the post-drying step is reduced or unnecessary.

[0011]

【Example】

(First Embodiment) Next, a multi-color printing machine of the present invention will be described with reference to a first embodiment shown in FIG. 1. In this embodiment, a dehumidifying device for removing water from printing paper is provided on the upstream side of the printing unit. ing. That is, 1 is a dehumidifying device, 101 is printing paper, 1
Reference numeral 10 is a multicolor printing unit, 102 and 103 are first color printing units, and the dehumidifying device 1 is a first color printing unit 102.
It is provided on the upstream side of 103.

When the printing paper 101 is shipped from a paper manufacturing factory, the humidity of the printing paper 101 is adjusted to about 8% for the purpose of preventing static electricity. If the dehumidifying device 1 is not provided, the first color printing unit through the fourth color printing unit.
After passing through the color printing unit, the printing paper 101 has a moisture content of 12 to 14%.
When 01 enters the first color printing units 102 and 103, it is dehumidified by the dehumidifying device 1 to increase the strength of the printing paper 101.

(Second Embodiment) Next, a multi-color printing machine of the present invention will be described with reference to a second embodiment shown in FIG. 2. In this embodiment, a dehumidifying device for removing water from printing paper is provided in each printing unit. It is provided in between. That is, 1 is a dehumidifying device, 101 is printing paper, 110 is a multicolor printing unit, 102 and 103 are first color printing units, 104 and 105 are second color printing units, 106 and 107 are third color printing units, and 108. ,
Reference numeral 109 is a fourth color printing unit, and the dehumidifying device 1 includes the first color printing units 102 and 103 through the fourth color printing unit 10.
It is provided between 8 and 109.

In this embodiment, the printing paper 101 is loaded into the first color printing units 102, 103 through the fourth color printing unit 1.
Each time it passes between 08 and 109, it is dehumidified by the dehumidifier 1 to increase the strength of the printing paper 101. (Third Embodiment) Next, a multicolor printing machine of the present invention will be described with reference to a third embodiment shown in FIG. 3. In this embodiment, the dehumidifying device is composed of an electric heater, and the electric heater is arranged in the paper width direction. It is divided and each can be controlled independently. That is, 1 is an electric heater type dehumidifier, 11 is an electric heater divided into a plurality of units in the paper width direction, and 12 is a reflector.
3 is a sub control device, 14 is a main control device, 15 is a power supply unit,
While the electric heater type dehumidifying device 1 is composed of a plurality of electric heaters 11, each electric heater 11 is divided into a plurality of units in the paper width direction, and each unit can be independently controlled.

In this embodiment, the amount of heat generated by each electric heater 11 is controlled by adjusting the current applied to each electric heater 11. That is, if the expansion difference in the paper width direction is uniform, the current applied to each electric heater 11 is adjusted by the main controller 14 to make the heat generation amount of each electric heater 11 uniform, and the expansion difference in the paper width direction is uneven. In this case, the sub-control device 13 adjusts the current applied to each electric heater 11 to make the heat generation amount of each electric heater 11 different.

Further, in order to efficiently transfer the heat from each electric heater 11 to the printing paper 101 running, each electric heater 11 is arranged close to the printing paper 101 running and the heat from each electric heater 11 is reflected. The plate 12 reflects the traveling printing paper 101 in the direction. (Fourth Embodiment) Next, a multi-color printing machine of the present invention will be described with reference to a fourth embodiment shown in FIG. 4. In this embodiment, the dehumidifying device is composed of an infrared heater, and the infrared heater is arranged in the paper width direction. It is divided and each can be controlled independently. That is, 1 is an infrared heater type dehumidifier, 21 is an infrared heater divided into a plurality in the paper width direction, 22 is a reflector, 23 is a sub-control unit, 24 is a main control unit, 25 is a power supply unit, and an infrared heater type dehumidifier While the device 1 is composed of a plurality of infrared heaters 21, the infrared heaters 21 are divided into a plurality of units in the paper width direction so that they can be controlled independently.

In this embodiment, the current applied to each infrared heater 21 is adjusted to control the amount of heat generated by each infrared heater 21 (each infrared heater 21 that emits infrared rays having a high water absorption rate). That is, if the expansion difference in the paper width direction is uniform,
If the main controller 24 adjusts the current applied to each infrared heater 21 to make the amount of heat generated by each infrared heater 21 uniform, and if the difference in expansion in the paper width direction is not uniform, the sub controller 2
The current applied to each infrared heater 21 is adjusted by 3 to make the heating value of each infrared heater 21 different.

In order to efficiently transfer the heat from each infrared heater 21 to the printing paper 101 running, each infrared heater 21 is arranged close to the printing paper 101 running, and the heat from each infrared heater 21 is reflected. The plate 22 is reflected in the direction of the printing paper 101 running. (Fifth Embodiment) Next, a multi-color printing machine of the present invention will be described with reference to a fifth embodiment shown in FIG. 5. In this embodiment, the dehumidifying device is composed of an air blowing device for discharging air at room temperature or high temperature. On the other hand, this air blowing device is divided into units in the paper width direction so that each can be controlled independently. That is, 1 is an air blowing device, 31 is an air supply header extending in the paper width direction, 32 is a plurality of nozzles provided at equal intervals of the air supply header 31, 33 is a sub-control device (for example, a flow rate adjusting valve), and 34 is A partition plate obtained by dividing the inside of the air supply header 31 into a plurality of parts, 35 a main controller (for example, a flow rate adjusting valve), 36 an air supply source part, and 37 an air supply header 31
In the partition chamber formed between the partition plates 34 in the inside, the air blowing device 1 is configured by the air supply header 31 and each nozzle 32, while each nozzle 32 partitions the partition chamber 3 between the partition plates 34.
7 is divided into a plurality of units in the paper width direction, and each unit can be independently controlled.

In this embodiment, the amount of air supplied from the air supply unit 36 to each nozzle 32 is adjusted to control the amount of discharge from each nozzle 32. That is, if the expansion difference in the paper width direction is uniform, the air supply amount to each nozzle 32 is adjusted by the main controller 34 to make the discharge amount from each nozzle 32 uniform, and the expansion difference in the paper width direction is uneven. If so, the sub-control device 3
The amount of air supplied to each nozzle 32 is adjusted by 3 to make the amount of discharge from each nozzle 32 different.

(Sixth Embodiment) Next, a multicolor printer of the present invention will be described with reference to a sixth embodiment shown in FIG. 6. In this embodiment, the dehumidifying device is constituted by a high frequency dielectric heating device, and the high frequency The dielectric heating device is divided in the paper width direction so that each can be controlled independently. That is, 1 and 1 are high-frequency dielectric heating devices, and these high-frequency dielectric heating devices 1,
1 is arranged in proximity to both sides of the printing paper 101 on which the paper 1 runs. Reference numeral 41 is an electrode of one high-frequency dielectric heating apparatus 1, 42 is a counter electrode of the other high-frequency dielectric heating apparatus 1, and these electrodes 41, 42 are divided into a plurality in the paper width direction. Four
3, 43 are sub-control devices for each high-frequency dielectric heating device 1, 44
Is a high-frequency generation / control device common to each high-frequency dielectric heating device 1.

In this embodiment, the high-frequency alternating current applied to the electrode 41 of one high-frequency dielectric heating device 1 and the counter electrode 42 of the other high-frequency dielectric heating device 1 is adjusted so that the high-frequency of each electrode 41, 42 is high. Control the amount generated. That is, if the expansion difference in the paper width direction is uniform, the high frequency generation / control device 44
By adjusting the high-frequency alternating current applied to all the electrodes 41, 42 to make the high-frequency generation amount of each electrode 41, 42 uniform, and if the expansion difference in the paper width direction is not uniform, the sub-control device 4
The high frequency alternating current applied to each electrode 41, 42 is adjusted by 3 to make a difference in the high frequency generation amount of each electrode 41, 42.

(Seventh Embodiment) Next, a multi-color printing machine of the present invention will be described with reference to a seventh embodiment shown in FIG. 7. In this embodiment, the dehumidifying device is constituted by an ultrasonic heating device. The sonic heating device is divided in the paper width direction so that each can be controlled independently. That is, 1 is an ultrasonic heating device,
52 is a mounting box extending in the paper width direction, 51 is a plurality of ultrasonic transducers provided at equal intervals in the mounting box 52, 53 is a sub-control device, 54 is a main control device, 55 is a power supply unit, and ultrasonic heating is performed. While the device 1 is configured by the ultrasonic transducers 51 and the mounting box 52, each ultrasonic transducer 51 is divided into a plurality of units in the paper width direction, and each unit can be independently controlled.

In this embodiment, the amount of ultrasonic waves generated by each ultrasonic transducer 51 is controlled by adjusting the current applied to each ultrasonic transducer 51. That is, if the expansion difference in the paper width direction is uniform, the current applied to each ultrasonic transducer 51 is adjusted by the main controller 54 to make the ultrasonic wave generation amount of each ultrasonic transducer 51 uniform, and If the expansion difference is uneven, the sub controller 53 adjusts the current applied to each ultrasonic transducer 51 to make a difference in the ultrasonic wave generation amount of each ultrasonic transducer 51.

(Eighth Embodiment) Next, a multicolor printing machine of the present invention will be described with reference to an eighth embodiment shown in FIG. 8. In this embodiment, the dehumidifying device is constituted by a heating roll pressure contact type heating device. . That is, 1 is a heating roll pressure contact type heating device, 65 is a steam generation device, 66 is a steam supply pipe connected to the steam generation device 65, and the steam supply pipe 66 has 2 on the heating roll side.
It branches in the direction. 67 is a steam return pipe connected to the steam generator 65, and the steam return pipe 67 is branched in two directions on the heating roll side.

Reference numerals 61 and 61 denote heating rolls that rotate at the same peripheral speed as the traveling speed of the printing paper 101. These heating rolls 61 have a hollow rotating shaft. Steam supply pipe 66 in which 62 is branched from both ends of the hollow rotary shaft of each heating roll 61
Each heating roll 61 is rotatably supported by a rotary joint that connects the heating roll 61 and the steam return pipe 67.
Reference numerals 63 and 63 are sub-control devices (for example, flow rate adjusting valves) provided in the steam supply pipe 66 after branching, and 64 is a main control device provided in the steam supply pipe 66 before branching.

In this embodiment, the heating rolls 61, 61 are rotated at the same peripheral speed as the traveling speed of the printing paper 101. In addition, saturated steam or superheated steam generated in the steam generator 65 is supplied into the branched steam supply pipe 66 → each rotary joint 62 → each heating roll 61 to supply each heating roll 61.
Is heated to dehumidify the printing paper 101, while the heated steam is returned to each rotary joint 62 → the branched steam return pipe 67 → the steam generator 65 to be reheated.

At this time, the main controller 64 and each sub controller 63 are operated as necessary to control the supply amount of saturated steam or superheated steam. The temperature of the heating roll 61 can be adjusted by the supply amount of saturated steam or superheated steam,
The temperature of the superheated steam can also be adjusted.

[0028]

The multicolor printing machine of the present invention is constructed as described above, and can achieve the following effects. That is, the Young's modulus E of the paper greatly decreases as the water content W of the paper increases, and especially when the water content W _o exceeds a certain limit, the Young's modulus tends to drastically decrease as shown in FIG. However, in the present invention,
8% for the purpose of preventing static when shipped from a paper mill
When the printing paper that has been moderately humidified enters the printing unit or while passing through the printing unit, it is dehumidified by the dehumidifying means to increase the strength of the printing paper. You can minimize the gap between colors. Further, since the absolute value of the water content of the printed paper is lowered, the transfer failure of the post-printing ink can be reduced and the additional energy in the drying step which is the post-step can be reduced or eliminated.

[Brief description of drawings]

FIG. 1 is a side view showing a first embodiment of a multicolor printing machine of the present invention.

FIG. 2 is a side view showing a second embodiment of the multicolor printing machine of the present invention.

FIG. 3 is a perspective view showing a third embodiment of the multicolor printing machine of the present invention.

FIG. 4 is a perspective view showing a fourth embodiment of the multicolor printing machine of the present invention.

FIG. 5 is a perspective view showing a fifth embodiment of the multicolor printing machine of the present invention.

FIG. 6 is a perspective view showing a sixth embodiment of the multicolor printing machine of the present invention.

7A is a perspective view showing a seventh embodiment of the multicolor printing machine of the present invention, and FIG. 7B is a vertical sectional side view taken along the line BB of FIG. 7A.

FIG. 8 is a perspective view showing an eighth embodiment of the multicolor printing machine of the present invention.

FIG. 9 is an explanatory diagram showing the relationship between Young's modulus of paper and water content of paper.

FIG. 10A is a side view showing a conventional multicolor printing machine,
(B) is a front view showing a printing sheet.

FIG. 11 is an explanatory diagram showing a state in which a multicolor overlapping pattern on a printing sheet on which multicolor printing is performed is displaced in the paper width direction.

FIG. 12 is an explanatory diagram showing a state in which alignment marks on printing paper on which multicolor printing has been performed are displaced in the paper width direction.

[Explanation of symbols]

 1 Dehumidifying Unit 101 Printing Paper 102 First Color Printing Unit 103 Second Color Printing Unit 110 Multicolor Printing Unit

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Masakazu Akatsuka 4-6-22 Kannon Shinmachi, Nishi-ku, Hiroshima City, Hiroshima Prefecture Mitsubishi Heavy Industries, Ltd. Hiroshima Research Laboratory (72) Inventor Hiromitsu Soeda, Kannon Shinmachi, Nishi-ku, Hiroshima City, Hiroshima Prefecture 6-22 No. 22 Hiroshima Research Laboratory, Mitsubishi Heavy Industries Ltd. (72) Inventor Yasuhiro Maruyama 4-8-4 Kannon Shinmachi, Nishi-ku, Hiroshima City, Hiroshima Prefecture Ryomei Giken Co., Ltd.

Claims (8)

[Claims] 1. A multi-color printing machine comprising a plurality of printing units, wherein dehumidifying means for removing water from printing paper is provided on at least one of the upstream side of the printing unit and each printing unit. Multicolor printing machine. 2. The multicolor printing machine according to claim 1, wherein the dehumidifying means is divided in the paper width direction so that the dehumidifying means can be independently controlled. 3. The multicolor printing machine according to claim 1, wherein the dehumidifying means is composed of an electric heater. 4. The multicolor printing machine according to claim 1, wherein the dehumidifying means is composed of an infrared heater heating device. 5. The multicolor printing machine according to claim 1, wherein the dehumidifying means is constituted by an air blowing device for discharging air at room temperature or high temperature. 6. The multicolor printing machine according to claim 1, wherein the dehumidifying means is composed of a high frequency dielectric heating device. 7. The multicolor printing machine according to claim 1, wherein the dehumidifying means is constituted by an ultrasonic heating device. 8. The multicolor printing machine according to claim 1, wherein the dehumidifying means is constituted by a heating roll pressure contact type heating device.