JPH0919998A - Printing method and printing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the printing quality in the case of printing a print sheet by controlling the temperature of the surface to be printed of the sheet in a predetermined temperature range previously decided immediately before it is printed by a printing unit. SOLUTION: The temperatures of the surface to be printed of a print sheet passed through the positions of a blanket cylinder 27 for forming the part of the printing part of a printing unit and a thermometer 21 disposed at the position immediately before a blanket cylinder 28 are measured by the thermometer 21. On the other hand, a temperature regulator 22 is so controlled by a controller 26 that the temperature measured by the thermometer 21 falls within a certain predetermined temperature range decided previously. In the regulator 22, the roller 29 for forming the part of an infeed unit is brought into indirect contact with water to be regulated at the surface temperature by rotating the roller 23 in the vessel 25 containing water 24.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a printing method and a printing machine for transferring ink to printing paper by a printing unit to print characters, photographs or figures, and more particularly to printing paper before printing. The present invention relates to a printing method and a printing machine that improve print quality by controlling the temperature within a certain temperature range.

[0002]

2. Description of the Related Art In general, printing means making a plate based on an original document, applying ink to the plate, and transferring the ink to printing paper to print characters, photographs or figures for reproduction. However, at this time, in principle, pressure is applied to transfer to the printing paper. A printing machine is a machine that constitutes the means for applying this pressure, and is usually composed of a plate mounting device, an inking device, a pressurizing device, and a device that supplies printing paper and carries it. Made of

On the other hand, the printing method depends on the shape of the plate.
There are four printing methods: planographic (offset printing), intaglio (gravure printing), letterpress (letterpress printing), and stencil (screen printing).

There are three types of printing presses depending on the form of the plate and the form of applying pressure, that is, the flat pressure type, the circular pressure type, and the rotary type. By the way, in the printing method as described above, when the ink is transferred to the printing paper to print characters, photographs or figures, for example, in the winter, when the printing paper is cold and dry, the ink is used. Depending on the temperature of the plate and the temperature of the plate, the transferability of the ink to the printing paper may be reduced, which may deteriorate the ink inking property, cause the shape to collapse, and leave paper dust on the plate, resulting in print quality. There is a problem that

Therefore, conventionally, the print quality is improved by controlling the temperature of the ink or the plate surface, but in a situation where there is a problem with the printing paper, such improvement cannot be expected.

[0006]

As described above, in the conventional printing method or printing machine, there is a problem that the print quality is deteriorated when the printing paper has a problem. The present invention has been made to solve the above problems, and a printing method capable of improving print quality (ink inking, shape, ink residue, etc.) when printing on a printing paper. The purpose is to provide a printing machine.

[0007]

In order to achieve the above object, first, in the invention corresponding to claim 1, printing is performed by printing characters, photographs or figures by a printing unit that transfers ink to printing paper. In the method, the temperature of the surface to be printed of the printing paper is controlled within a predetermined constant temperature range immediately before printing by the printing unit.

Further, in the invention according to claim 2, in a printing machine including a printing unit for transferring ink onto a printing paper, and printing characters, photographs or figures by the printing unit, the printing unit is arranged immediately before the printing unit. And temperature measuring means for measuring the temperature of the printing surface of the printing paper passing through the position,
The temperature measured by the temperature control means, which is arranged immediately before the printing section and upstream of the temperature measurement means, controls the temperature of the printing paper passing through the position, and the temperature measured by the temperature measurement means is set in advance. And a control means for controlling the temperature control means so that the temperature is within a certain fixed temperature range.

Here, in particular, as the temperature adjusting means, for example, as described in claim 3, by adjusting the temperature of the surface of the roller which comes into contact with the printing paper and moves the printing paper to the printing section, It is preferable to control the temperature of the printing paper by transferring heat to the printing paper.

More preferably, for example, as described in claim 4, hot water or oil is passed through a roller for moving the printing paper to the printing section to adjust the temperature of the surface of the roller. Alternatively, for example, as described in claim 5, a roller arranged in contact with a roller for moving the printing paper to the printing unit is brought into contact with water to adjust the temperature of the surface of the roller.

On the other hand, it is preferable that the temperature adjusting means controls the temperature of the printing paper by applying hot air to the printing paper, as described in claim 6, for example.

As the temperature adjusting means, for example, as described in claim 7, it is preferable that the temperature of the printing paper is adjusted by irradiating the printing paper with infrared rays (IR).

Further, as the temperature adjusting means, it is preferable that, for example, as described in claim 8, the temperature of the printing paper is adjusted by generating and applying steam to the printing paper.

On the other hand, it is preferable that the temperature adjusting means adjusts the temperature of the printing paper by irradiating the printing paper with ultraviolet rays (UV) as described in claim 9, for example.

As the temperature adjusting means, for example, as described in claim 10, by adjusting the temperature of the surface of the feeder board for supplying the printing paper to the printing section,
It is preferable to control the temperature of the printing paper by transferring heat to the printing paper.

Further, it is preferable that the temperature control means controls the temperature of the printing paper by spraying hot water or water onto the printing paper, as described in claim 11, for example.

[0017]

Therefore, in the printing method and the printing machine of the present invention, the temperature of the surface to be printed of the printing paper is measured by the temperature measuring means immediately before printing by the printing unit, and the temperature of the surface to be printed of the printing paper is measured. By controlling the temperature control means by the control means so that the temperature is within a predetermined constant temperature range, for example, even when the printing paper is cold and dry, such as in winter, Print paper is temperature treated,
It is possible to prevent the transferability of the ink to the printing paper from decreasing.

As a result, it is possible to prevent deterioration of the ink inking property, collapse of the shape, ink remaining on the plate, and the like, and consequently improve the printing quality when printing on the printing paper. You can

[0019]

Embodiments of the present invention will be described below in detail with reference to the drawings. (First Embodiment) FIG. 1 is a schematic view showing a configuration example of a winding rotary press (offset) to which the present invention is applied.

As shown in FIG. 1, the take-up rotary press comprises a plurality of rollers and feeds a printing paper 0 to an infeed device 2 and a printing paper 0 from the feeding device 1. An in-feed device 2 that takes in and sends it to the printing unit unit 3, and a four-stage printing unit that transfers ink to the printing paper 0 from the in-feed device 2 by an offset printing method to print characters, photographs or figures A printing unit section 3, a drying device 4 for drying the printing paper 0 printed by the printing unit section 3, a cooling device 5 for cooling the dried printing paper 0 from the drying device 4, and a cooling device 5. And a folding machine 6 for folding the cooled printing paper 0 from.

FIG. 2 is a schematic diagram showing an example of the essential structure of a printing paper temperature adjusting apparatus according to this embodiment when it is applied to the take-up rotary press shown in FIG. As shown in FIG. 2, the printing paper temperature adjusting apparatus of this embodiment is composed of a thermometer 21 as a temperature measuring means, a temperature controller 22, a roller 23, and a container 25 containing water 24. It comprises a heating means and a control device 26.

Here, the thermometer 21 is arranged immediately in front of the blanket cylinder 27 and the blanket cylinder 28 which form a part of the one-stage printing section of the printing unit section 3, and the printing paper 0 passing through this position. The temperature of the surface to be printed of is measured.

Further, the temperature adjusting means is arranged such that one roller 23 is arranged in a container 25 containing water 24 as shown in the drawing,
By rotating the roller 23 by the temperature controller 22, the infeed is positioned upstream of the location of the thermometer 21 and is in contact with the roller 23 and sandwiches the printing paper 0. The roller 29 forming a part of the device 2 is indirectly contacted with water to adjust the temperature of the surface thereof, and the heat is transferred to the printing paper 0 to adjust the temperature of the printing paper 0.

Further, the control device 26 controls the temperature controller 22 so that the temperature measured by the thermometer 21 falls within a predetermined constant temperature range.

Next, a printing method in the take-up rotary press to which the printing paper temperature adjusting device of the present embodiment having the above-mentioned configuration is applied will be described. In FIG. 1, the unwinding device 1
The printing paper 0 sent out from is taken into the in-feed device 2 and then sent out to the printing unit section 3.

In the printing unit section 3, ink is transferred to the printing paper 0 by the offset printing method to print characters, photographs or figures. Then, the printing paper 0 that has been printed by the printing unit unit 3 is printed by the drying device 4
Then, it is dried by the cooling device 5, and finally folded by the folding machine 6.

On the other hand, in the present embodiment, when printing is performed on the printing paper 0 in the printing unit section 3, the following control is performed. That is, in FIG. 2, by the thermometer 21 arranged immediately in front of the blanket cylinder 27 and the blanket cylinder 28 that form a part of the printing unit of the printing unit unit 3,
The temperature of the printing surface of the printing paper 0 passing through the position is measured.

On the other hand, the controller 26 controls the temperature controller 22 so that the temperature measured by the thermometer 21 falls within a predetermined constant temperature range. Then, in the temperature controller 22, the roller 2 in the container 25 containing the water 24
By rotating the roller 3, the roller 29 forming a part of the infeed device 2 indirectly contacts the water and the surface temperature thereof is adjusted. The temperature of is adjusted so as to be within the above-mentioned predetermined temperature range.

In this case, the temperature of the printing paper 0 is adjusted in the following temperature range as the predetermined temperature range. That is, FIG. 3 is a characteristic diagram showing an example of an experimental result of the relationship between the paper surface temperature on the paper feed side of printing paper 0 and the solid density, and FIG. 4 is the same as the paper surface temperature on the paper feed side of printing paper 0 and the solid density. It is a correspondence diagram which shows an example of the experimental result of a relationship.

From FIGS. 3 and 4, when the surface temperature of the printing paper 0 on the paper feed side is 30 ° C., the value of the solid density becomes the largest, and the paper surface temperature on the paper feed side of the printing paper 0 is 26 ° C. to 38 ° C.
Thus, it can be seen that the value of the solid density becomes large to some extent, and the solid density effect can be obtained by controlling the paper surface temperature on the paper feed side.

Therefore, the control device 26 causes the printing paper 0
The paper surface temperature of the paper feed side is in the temperature range of 26 ° C to 38 ° C,
High print quality can be obtained by controlling the temperature controller 22 so that the temperature range is preferably 28 ° C. to 32 ° C., more preferably 30 ° C.

As described above, in this embodiment, the blank cylinder 27 that constitutes a part of the one-stage printing section of the printing unit section 3
And a thermometer 2 which is arranged immediately before the blanc 28 and measures the temperature of the printing surface of the printing paper 0 passing through the position.
1, and one roller 23 is arranged in a container 25 containing water 24 as shown in the drawing, and this roller 23 is driven to rotate by a temperature controller 22 so that the temperature is higher than that of the thermometer 21. The roller 29 which is located on the upstream side and which is in contact with the roller 23 and which is arranged with the printing paper 0 sandwiched therebetween and which constitutes a part of the infeed device 2 is indirectly contacted with water so that the surface temperature thereof is A temperature adjusting unit that adjusts and transfers heat to the printing paper 0 to adjust the temperature of the printing paper 0, and a temperature adjuster 22 so that the temperature measured by the thermometer 21 falls within a predetermined certain temperature range. Control device 2 for controlling
6 and a printing paper temperature adjusting device, and immediately before the printing unit 3 prints on the printing paper 0, the temperature of the printing surface of the printing paper 0 is set to a predetermined constant temperature range (26 ° C.). To 38 ° C., preferably 28 ° C. to 32 ° C., and more preferably 30 ° C.).

Therefore, even when the printing paper 0 is cold and dry, for example, in winter, the printing paper 0 before printing is not printed.
Can be subjected to a temperature treatment so that the transferability of the ink to the printing paper 0 is not lowered.

As a result, when ink is printed on the printing paper 0, the inking property of the ink (in the winding rotary press (offset), the degree of halftone dot size) deteriorates, the shape collapses, and the ink is applied to the plate. It is possible to improve the print quality when printing is performed on the printing paper 0 as a result of not causing the rest.

(Second Embodiment) FIG. 5 is a schematic view showing a structural example of a sheet-fed machine (offset) to which the present invention is applied.

As shown in FIG. 5, the sheet-fed press has a printing paper 3
A paper feeding device 31 that stores 1a and sends the printing paper 31a to the feeder board 32, and a feeder board 3 that sends the printing paper 31a from the paper feeding device 31 to the printing device 33.
2, a plate cylinder 33a, an inking section 33b, a mixing section 33c, a blanket cylinder 33d, an impression cylinder 33e, and a discharge cylinder 33f. The ink is transferred to the printing paper 31a from the feeder board 32 by the offset printing method. , A printing device 33 that prints characters, photographs, or graphics, and a paper ejection device 3 that ejects the printing paper 31a that has been printed by the printing device 33.
It consists of four.

FIG. 6 is a schematic view showing an example of the essential structure of a printing paper temperature control apparatus according to this embodiment when it is applied to the sheet-fed machine shown in FIG. As shown in FIG. 6, the printing paper temperature adjusting device of this embodiment has a thermometer 41 as a temperature measuring means.
And a temperature controller 42, which is a temperature controller, and a controller 43.

Here, the thermometer 41 is the same as the printing device 33.
Plate cylinder 33a, which is a part of the printing section of the
d, the temperature of the surface to be printed of the printing paper 31a passing through the position is measured immediately before the impression cylinder 33e.

Further, the temperature controller 42 adjusts the temperature of the surface of the feeder board 32 which supplies the printing paper 31a to the printing section of the printing device 33 and transfers the heat to the printing paper 31a to adjust the temperature of the printing paper 31a. To do.

Further, the control device 43 controls the temperature controller 42 so that the temperature measured by the thermometer 41 falls within a predetermined certain temperature range.

Next, a printing method in the take-up rotary press to which the printing paper temperature adjusting device of the present embodiment having the above-mentioned structure is applied will be described. In FIG. 5, the paper feeding device 31
The printing paper 31a sent out from the feeder board 3 is
2 and then sends it to the printing device 33.

In the printing device 33, ink is transferred to the printing paper 31a by the offset printing method to print characters, photographs or figures. Then, the printing device 3
The printing paper 31a for which printing by 3 has been finished
At f, the printing paper 31a that has been sent to the paper discharge device 34 and finished printing is finally discharged.

On the other hand, in the present embodiment, when printing on the printing paper 31a in the printing device 33, the following control is performed. That is, in FIG. 6, the plate cylinder 33 a and the blank cylinder 3 that form a part of the printing unit of the printing device 33.
The temperature of the surface to be printed of the printing paper 31a passing through this position is measured by the thermometer 41 arranged immediately before the impression cylinder 33e.

On the other hand, the controller 43 controls the temperature controller 42 so that the temperature measured by the thermometer 41 falls within a predetermined temperature range. Then, in the temperature controller 42, the temperature of the surface of the feeder board 32 that supplies the printing paper 31a to the printing unit 33 is adjusted, so that heat is transferred to the printing paper 31a and the printing paper 31a.
The temperature of a is adjusted so as to be in the above-mentioned predetermined certain temperature range.

In this case, the temperature of the printing paper 31a is adjusted within the temperature range as described in the first embodiment as the predetermined constant temperature range. That is, the relationship characteristic diagram between the paper surface temperature on the paper feed side of the printing paper 31a and the solid density shown in FIG. 3 and the correspondence diagram between the paper surface temperature on the paper feed side of the printing paper 31a and the solid density shown in FIG. Based on the paper surface temperature of the printing paper 31a on the paper feed side,
Temperature range of 26 ° C to 38 ° C, preferably 28 ° C to 3
In a temperature range of 2 ° C, more preferably 30 ° C,
High print quality can be obtained by controlling the temperature controller 22.

As described above, in this embodiment, the plate cylinder 33a and the blank cylinder 3 which form a part of the printing section of the printing device 33.
3d, a thermometer 41 arranged immediately before the impression cylinder 33e and measuring the temperature of the printing surface of the printing paper 31a passing through the position, and a feeder board 32 for supplying the printing paper 31a to the printing section of the printing device 33. The temperature measured by the temperature controller 42, which adjusts the temperature of the surface of the paper and transfers the heat to the printing paper 31a to adjust the temperature of the printing paper 31a, falls within a predetermined certain temperature range. As described above, a printing paper temperature adjusting device is configured with the control device 43 for controlling the temperature controller 42, and immediately before the printing device 33 prints on the printing paper 31a, the temperature of the printing surface of the printing paper 31a is changed to A certain predetermined temperature range (26 ° C to 38 ° C, preferably 28 ° C to 32 ° C,
More preferably, the temperature is controlled to 30 ° C.

Therefore, the printing paper 31a, for example, in winter
Even when it is cold and dry, the printing paper 31a before printing can be subjected to a temperature treatment so that the transferability of the ink to the printing paper 31a is not lowered.

As a result, inking property of ink when printing on the printing paper 31a (winding rotary press (offset))
Then, the degree of the size of halftone dots) deteriorates, the shape collapses,
Ink is not left on the plate, and as a result, it is possible to improve the print quality when printing on the printing paper 31a.

The present invention is not limited to the above embodiment, but can be implemented in the same manner as described below. (A) In each of the embodiments described above, the present invention is applied to a web-fed rotary press and a sheet-fed press as an offset printing machine (lithographic printing plate). However, the present invention is not limited to this, and a satellite-type offset printing machine can be used. It is also possible to apply the present invention to a gravure printing machine (an intaglio) or a letterpress printing machine (a letterpress) in the same manner and to obtain the same effects as the above case.

(B) In the first embodiment, as the temperature adjusting means, heat is transferred to the printing paper by adjusting the temperature of the surface of the roller that comes into contact with the printing paper and moves the printing paper to the printing section. However, the present invention is not limited to this, for example, by passing hot water or oil through a roller that moves the printing paper to the printing unit and adjusting the temperature of the surface of the roller, printing is performed. The temperature of the printing paper may be adjusted by transferring heat to the paper.

(C) In the first embodiment, as the temperature adjusting means, heat is transferred to the printing paper by adjusting the temperature of the surface of the roller that comes into contact with the printing paper and moves the printing paper to the printing section. Although the temperature of the printing paper has been described above, the present invention is not limited to this, and the temperature of the printing paper may be adjusted by applying hot air to the printing paper, for example.

(D) In the first embodiment, as the temperature adjusting means, the heat transfer to the printing paper is performed by adjusting the temperature of the surface of the roller that comes into contact with the printing paper and moves the printing paper to the printing section. The temperature of the printing paper has been described above, but the present invention is not limited to this, and the temperature of the printing paper may be adjusted by irradiating the printing paper with infrared rays (IR), for example.

(E) In the first embodiment, as the temperature adjusting means, the temperature of the surface of the roller that comes into contact with the printing paper and moves the printing paper to the printing section is adjusted to transfer heat to the printing paper. Although the temperature of the printing paper has been described above, the present invention is not limited to this, and the temperature of the printing paper may be adjusted by, for example, generating and applying steam to the printing paper.

(F) In the first embodiment, as the temperature adjusting means, heat is transferred to the printing paper by adjusting the temperature of the surface of the roller that comes into contact with the printing paper and moves the printing paper to the printing section. Although the temperature of the printing paper has been described above, the present invention is not limited to this, and the temperature of the printing paper may be adjusted by irradiating the printing paper with ultraviolet rays (UV).

(G) In the first embodiment, as the temperature adjusting means, heat is transferred to the printing paper by adjusting the temperature of the surface of the roller that comes into contact with the printing paper and moves the printing paper to the printing section. The temperature of the printing paper has been described above, but the present invention is not limited to this, and the temperature of the printing paper may be adjusted by spraying hot water or water onto the printing paper.

[0056]

As described above, according to the present invention, the temperature is measured at the position immediately before the printing unit that transfers ink to the printing paper and measures the temperature of the printing surface of the printing paper that passes through the position. Means, a temperature control means arranged immediately before the printing section and upstream of the location of the temperature measurement means, for adjusting the temperature of the printing paper passing through the location, and the temperature measured by the temperature measurement means. Is provided with a control means for controlling the temperature adjusting means so that the temperature is within a predetermined constant temperature range, and the temperature of the surface to be printed of the printing paper is set to a predetermined value immediately before printing by the printing section. Since the temperature is controlled within a certain temperature range, it is possible to provide a printing method and a printing machine capable of improving the printing quality (ink inking, shape, ink residue, etc.) when printing on printing paper.

[Brief description of the drawings]

FIG. 1 is a take-up rotary press (offset) to which the present invention is applied.
FIG.

FIG. 2 is a schematic diagram showing a configuration example of a main part when the printing paper temperature adjusting device according to the first embodiment of the present invention is applied to a take-up rotary press.

FIG. 3 is a characteristic diagram showing an example of an experimental result of a relationship between a paper surface temperature on a paper feeding side of printing paper and a solid density.

FIG. 4 is a correspondence diagram showing an example of an experimental result of the relationship between the paper surface temperature on the paper feed side of printing paper and the solid density.

FIG. 5 is a schematic diagram showing a configuration example of a sheet-fed machine (offset) to which the present invention is applied.

FIG. 6 is a schematic diagram showing a configuration example of a main part when a printing paper temperature adjusting device according to a second embodiment of the present invention is applied to a sheet-fed machine.

[Explanation of symbols]

 0 ... Printing paper, 1 ... Unwinding device, 2 ... Infeed device, 3 ... Printing unit part, 4 ... Drying device, 5 ... Cooling device, 6 ... Folding machine, 21 ... Thermometer, 22 ... Temperature controller, 23 ... Roller, 24 ... Water, 25 ... Container, 26 ... Control device, 27 ... Blank cylinder, 28 ... Blank cylinder, 29 ... Roller, 31 ... Paper feeding device, 31a ... Printing paper, 32 ... Feeder board, 33 ... Printing device , 33a ... Plate cylinder, 33b ... Ink section, 33c ... Mixing section, 33d ... Blank cylinder, 33e ... Impression cylinder, 33f ... Paper ejection cylinder, 34 ... Paper ejection device, 41 ... Thermometer, 42 ... Temperature controller, 43 ... Control device.

Claims (11)

[Claims] 1. A printing method for printing characters, photographs, or graphics by a printing unit that transfers ink to a printing paper, wherein the temperature of the surface to be printed of the printing paper is adjusted immediately before printing by the printing unit. A printing method, characterized in that the temperature is controlled within a predetermined temperature range. 2. A printing machine comprising a printing unit for transferring ink to a printing paper, wherein the printing unit prints characters, photographs or figures, the printing unit being arranged immediately before the printing unit and passing through the position. Temperature measuring means for measuring the temperature of the printed surface of the printing paper, and the temperature of the printing paper which is arranged immediately before the printing part and at a position upstream of the arrangement part of the temperature measuring means and which passes through the position. A temperature control means for adjusting the temperature control means, and a control means for controlling the temperature control means so that the temperature measured by the temperature measurement means falls within a predetermined certain temperature range. And printing machine. 3. The temperature adjusting means adjusts the temperature of the surface of a roller that comes into contact with the printing paper and moves the printing paper to the printing section, so that heat is transferred to the printing paper to control the temperature of the printing paper. The printing press according to claim 2, wherein the printing press is adjusted. 4. The temperature adjusting means is for adjusting the temperature of the surface of the roller by passing hot water or oil through a roller for moving the printing paper to the printing section. Printing machine. 5. The temperature adjusting means is a means for adjusting a temperature of a surface of a roller by bringing a roller arranged in contact with a roller for moving a printing paper to a printing portion into contact with water. The printing machine according to claim 3. 6. The printing machine according to claim 2, wherein the temperature adjusting unit adjusts the temperature of the printing paper by applying hot air to the printing paper. 7. The printing machine according to claim 2, wherein the temperature adjusting unit adjusts the temperature of the printing paper by irradiating the printing paper with infrared rays (IR). 8. The printing machine according to claim 2, wherein the temperature control unit controls the temperature of the printing paper by generating and applying steam to the printing paper. 9. The printing machine according to claim 2, wherein the temperature adjusting unit adjusts the temperature of the printing paper by irradiating the printing paper with ultraviolet rays (UV). 10. The temperature adjusting means adjusts the temperature of the printing paper by adjusting the temperature of the surface of a feeder board that supplies the printing paper to the printing section. The printing machine according to claim 2, wherein: 11. The printing machine according to claim 2, wherein the temperature adjusting unit controls the temperature of the printing paper by spraying hot water or water onto the printing paper.