JPH02132447A - Method and device for development processing of photosensitive planographic printing plate - Google Patents

Abstract

PURPOSE:To assure a development processing with a min. required volume of a developing soln. by supplying a prescribed volume of the developing soln. to the plate surface of the planographic printing plate and developing the soln. on the plate surface by a rubbing member. CONSTITUTION:The photosensitive planographic printing plate 12 on which images are printed is transported by a transporting roller pair 20 to a developing section 14 where the plate 12 is crimped by the rubbing member 34 and receiving roller 51 of the rubbing means 30 and while the developing soln. of the prescribed volume is supplied atop the plate 12 from a developing soln. supplying channel 36 of the member 34, the soln. is developed over the entire surface thereof. The plate 12 is then transported to the developing soln. rubbing means 32 and while the developing soln. is supplied to the rear surface of the plate 12 from the member 34 in the same manner as mentioned above, the developing soln. is developed on the surface. The plate 12 is in succession washed in a washing section and a desensitization processing liquid is applied thereon and is dried in a desensitization processing section.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method and apparatus for developing a photosensitive planographic printing plate on which an image has been printed.

[Prior Art] A photosensitive planographic printing plate on which an image has been printed is conveyed to a photosensitive planographic printing plate developing device and subjected to development processing.

This development can be carried out either by spraying, in which a developer is supplied to the plate surface of the photosensitive material by spraying, or by immersing the photosensitive planographic printing plate in a developing tank containing a developer. There is a so-called depth method in which the plate surface of a photosensitive lithographic printing plate is coated with a sufficient amount of developer for development.

However, in the case of the above-mentioned one-spray type, the developing solution is recycled and used, so that it gradually deteriorates due to components eluted from the photosensitive layer of the photosensitive material. Also, if the developer is alkaline,
It also deteriorates due to carbon dioxide gas in the air.

Furthermore, in the case of the dip method, since the photosensitive lithographic printing plate is immersed, a large amount of developer is charged, and the developer deteriorates as the number of sheets processed increases. As a method for preventing the deterioration of this developing solution, JP-A-50-144502 and JP-A-5-4-6 have been proposed.
2004, Japanese Patent Application Laid-open No. 55115039, and Japanese Patent Application Laid-Open No. 56-12645 propose means for replenishing the developer replenisher, but the devices are complicated and expensive. Furthermore, when replacing the developer with a new developer, there were cases where the developer that was still usable was discarded. For this reason, it has not been possible to use the developing solution efficiently without wasting it.

On the other hand, in the case of the metering method, the amount of developer used is smaller than that of the one-way spray method or the depth method.
There is an advantage that the device is simple because no replenishment device or circulation device is required.

In this metering method, JP-A-6-2-8-796
No. 4 proposes a method in which a developer is applied to a photosensitive lithographic printing plate while it is conveyed in the vertical direction.

[Problems to be Solved by the Invention] However, in vertical conveyance, there is a problem that the applied developer naturally falls downward, staining the photosensitive planographic printing plate located below and staining the inside of the device and the surrounding area. .

When the photosensitive lithographic printing plate is conveyed in a substantially horizontal direction and the developer is applied using the metering method described above, if the plate surface on which the image is recorded is on the top surface, the developer does not fall downward and is coated on the plate surface. However, if it is located on the bottom surface, the developer will fall naturally, making it impossible to develop the bottom surface, making sure to develop both the top and bottom surfaces or the bottom surface of the photosensitive planographic printing plate. I couldn't do it.

In consideration of the above facts, the present invention provides a method and apparatus for developing a photosensitive lithographic printing plate, which can reliably develop both the upper and lower sides of a photosensitive lithographic printing plate using the minimum necessary amount of developer. The purpose is to

[Means for Solving the Problem] The present invention provides a photosensitive planographic printing plate development processing method and apparatus for developing a photosensitive planographic printing plate on which an image has been printed. The method is characterized in that the photosensitive lithographic printing plate is developed by spreading the supplied developer onto the plate surface with a rubbing member while supplying a predetermined amount of an unused developer.

[Function] In the present invention having the above configuration, while supplying a predetermined amount of developer to the surface of the photosensitive lithographic printing plate on which an image has been printed, the supplied developer is rubbed onto the photosensitive lithographic printing plate by a rubbing member. Expand. As a rubbing member, a sponge,
Any soft material that does not damage the photosensitive material may be used, such as felt, nonwoven fabric, rubber, or brush.

This accelerates the development process of the photosensitive lithographic printing plate.

In this way, in the present invention, the minimum required amount of developer is supplied to the photosensitive lithographic printing plate, and this developer is rubbed and spread to perform the development process, so there is no drop of the developer.
A predetermined amount of developer is reliably supplied to the plate surface, and both or one side of the photosensitive planographic printing plate can be reliably developed with the minimum amount of developer.

The developer used in the present invention has a surface tension of <5Qdyn at 25°C as described in Japanese Patent Application No. 61-307056.
e/cm or less, and the viscosity is preferably 5 cp or more and 10 ooo cp or less at 25°C as described in Japanese Patent Application No. 631701.

[Example] FIG. 1 shows an example of a photosensitive planographic printing plate processing apparatus 10 to which the present invention is applied.

The photosensitive lithographic printing plate processor 10 includes a developing section 1 for developing a photosensitive lithographic printing plate (hereinafter referred to as "PS plate") 12 on which images have been printed on both upper and lower surfaces by a printing device (not shown).
4, and a necessary water washing section 16 for washing the PS plate 12 after development.
and a desensitizing treatment section 18 for applying a desensitizing treatment liquid to the PS plate 12. These developing sections 14,
The water washing section 16 and the desensitization processing section 18 are provided in the above order, and the PS plate 12 with images printed on both the upper and lower surfaces is transported approximately horizontally and processed.

As shown in FIG. 1, a pair of transport rollers 20 are arranged on the side where the PS plate 12 is inserted into the developing section 14. A PS plate 12 with images printed on both upper and lower surfaces by a printing device (not shown) is inserted between the pair of transport rollers 20.

The developing section 14 is equipped with a drain tank 22 .

The drain tank 22 is open at the top and has a substantially inverted mountain shape with the bottom central portion protruding downward.

Above the drain tank 22, two pairs of conveyance rollers 26 and 28 are arranged along the conveyance direction of the PS plate 12 (the eight directions of arrows). The pair of transport rollers 26 and 28 are rotatably supported by a pair of side plates (not shown), and are rotated by the driving force of a driving means (not shown) transmitted thereto. The PS plate 12 sent out from the pair of conveying rollers 20 is conveyed along a substantially horizontal direction above the developer tank 22 by a pair of conveying rollers 26 and 28, and is sent to the washing section 16.

Developing solution rubbing means 30 and 32 are arranged between the transport roller pair 26 and the transport roller pair 28.

As shown in FIG. 2, the rubbing means 30 includes a rubbing member 34 disposed above the conveyance path of the PS plate 12. This rubbing member 34 is formed long along the width direction of the PS plate 12. A developer supply groove 36 having a rectangular cross section is formed on the lower surface of the rubbing member 34 along the width direction of the PS plate 12 . A longitudinally intermediate portion of this developer supply groove 36 communicates with one end of a pipe line 38 . Conduit 38 is conduit 39
The pipe line 39 is connected to the bottom of the developer tank 22 . A developer supply pump 40 is disposed in the middle of this conduit 39. By operating the developer supply pump 40, the developer 24 in the developer tank 43 is supplied to the developer supply groove 36.

A roller 44 is connected to one end of the rubbing member 34 in the longitudinal direction via a connecting bracket 42 . This roller 44 is inserted into a groove 48 of a grooved cylindrical cam 46 that is pivotally supported on a side plate (not shown). This grooved cylindrical cam 46 is connected to a drive shaft of a motor 50 supported by a side plate (not shown). As a result, the grooved cylindrical cam 46 is rotated by the operation of the motor 50. By this rotation, the roller 44 is guided by the groove 48 and moves, causing the rubbing member 34 to reciprocate in the width direction of the PS plate 12 (in the direction of arrow B). in this case. The rubbing member 34 is guided by a guide means (not shown). Further, the conduit 38 is made of a flexible material,
It is designed to follow this movement.

By this reciprocating movement, the developer supplied to the PS plate 12 from the developer supply groove 36 is developed and spread over the PS plate 12.

A receiving roller 51 is arranged below the conveyance path of the PS plate 12 in correspondence with the rubbing member 34 . As a result, PS version 1
2 is supported between the rubbing member 34 and the receiving roller 51.

A developer rubbing means 32 having the same configuration as the developer rubbing means 30 is arranged downstream of the developer rubbing means 30 in the transport direction of the PS plate l2. The developer rubbing means 32 has a rubbing member 42 disposed corresponding to the lower surface of the PS plate 12, and a receiving roller 51 having the same structure is disposed corresponding to the upper surface of the PS plate 12. Further, the pipe line 41 and the developer supply groove 36 are communicated with each other. As a result, the developer supply groove 36
The developer supplied to the PS plate 12 is applied to the lower surface of the PS plate 12, and is spread and spread on the lower surface of the PS plate 12 by the rubbing member 34.

Further, one end of a pipe line 52 is connected to the bottom of the developer tank 43 . In the middle of this pipe line 52, a circulation pump 54,
A heat exchanger 56 is arranged.

The other end is communicated with a developer tank 43. The developer 24 in the developer tank 43 is circulated by the operation of the circulation pump 54, and is heated to a predetermined temperature by the heat exchanger 56.

Further, one end of a pipe line 58 is communicated with the bottom of the drain tank 22 . A valve 60 is disposed in the middle of this conduit 58. By opening this valve 60, the drained liquid in the drained liquid tank 22 is discharged to the drained liquid tank 53.

The washing section 16 is equipped with a washing tank 76, and above the washing tank 76, two pairs of transport rollers 68 and 70 are arranged in sequence along the transport path of the PS plate 12. These transport roller pairs 68 and 70 are pivotally supported by a pair of side plates (not shown), and are rotationally driven by the driving force of a driving means (not shown). With this drive, PS
The plate 12 is conveyed in a substantially horizontal direction.

Spray pipes 72 and 74 are arranged between the transport roller pair 68 and the transport roller pair 70.

The spray pipe 72 is connected to the PS plate 12 on the transport roller pair 68 side.
spray pipe 74.
is arranged below the transport path of the PS plate 12 on the transport roller pair 70 side. These spray pipes 72 and 74 are provided with a plurality of discharge ports along the axial direction, and each of the spray pipes 72 and 74 opens toward the transport path of the PS plate 12.

The spray pipes 72 and 74 have one end communicating with a conduit 78 that communicates with the bottom of the washing tank 76 .

A flush water supply pump 80 is disposed in the middle of this pipe line 78, and by the operation of this flush water supply pump 80,
Rinsing water 82 stored at the bottom of the rinsing tank 76 is supplied to the spray pipes 74 and 76.

Further, one end of a pipe line 84 is connected to the bottom of the washing tank 76 . A valve 86 is disposed in the middle of this pipe 84, and when the valve 86 is opened, the washing water 82 in the washing tank 76 is discharged to the drain tank 53.

The desensitization treatment section 18 is equipped with a desensitization treatment tank 88 . A desensitizing liquid 102 is stored at the bottom of the desensitizing tank 88 .

Above the desensitization treatment tank 88, two pairs of conveyance rollers 90 and 92 are arranged along the conveyance direction of the PS plate 12. These transport roller pairs 90 and 92 are pivotally supported by a pair of side plates (not shown), and are rotated by the driving force of a driving means (not shown). The PS plate 12 sent out from the transport roller pair 70 is inserted into the transport roller pair 90,
The paper is transported substantially horizontally by a pair of transport rollers 92.

Spray pipes 94 and 96 are arranged between the transport roller pair 90 and the transport roller pair 92.

The spray pipe 94 is connected to the PS plate 12 on the transport roller pair 90 side.
The spray pipe 96 is arranged below the transport path of the PS plate 12 on the transport roller pair 92 side.

These spray pipes 94 and 96 have a plurality of discharge ports formed along the axial direction, each opening toward the transport path of the PS plate 12.

The spray pipes 94 and 96 have one end connected to the desensitizing tank 8.
It communicates with a conduit 98 that communicates with the bottom of the tube 8. A supply pump 100 is disposed in the middle of this pipe line 98, and the operation of this supply pump 100 causes the desensitization treatment liquid 102 in the desensitization treatment tank 88 to be sprayed into the spray pipe 94,
96.

Further, one end of a conduit 104 is connected to the bottom of the desensitization treatment tank 88 . This photosensitive planographic printing plate processing device 104
A valve 106 is disposed in the middle, and when the valve 106 is opened, the desensitizing treatment liquid 102 in the desensitizing treatment tank 88 is discharged.

Next, the operation of this embodiment will be explained.

The PS plate 12, on which images have been printed on both upper and lower surfaces by a printing device (not shown), is inserted into a pair of transport rollers 20, and then inserted between a pair of transport rollers 26 of the developing section 14. The PS plate 12 inserted between the pair of conveying rollers 26 is conveyed substantially horizontally and sent out toward between the pair of conveying rollers 28.

The upper surface of the PS plate 12 sent out from the transport roller pair 26 is supplied with developer from the developer supply groove 36 of the rubbing member 34 . The supplied developer is spread and spread on the upper surface of the PS plate 12 by the rubbing member 34. This ensures that the developer is applied to the upper surface of the PS plate 12.
Development is accelerated. At this time, the lower surface of the PS plate 12 is supported by a receiving roller 51 arranged below the PS plate 12.

The developer is applied to the upper surface by the developer rubbing means 30, and the PS plate 12 whose development is promoted is further conveyed and held between the rubbing member 34 of the developer rubbing means 32 and the receiving roller 51. As a result, the developer is supplied to the lower surface of the PS plate 12, and is spread and spread by the rubbing member 34. Therefore, the development of the lower surface of the PS plate 12 is accelerated and the development process is reliably performed.

As described above, in this embodiment, a predetermined amount of developer is supplied to both the upper and lower surfaces of the PS plate 12, and then this developer is developed and spread over the surface for development processing. can be reliably developed.

A developer is applied to both the upper and lower surfaces, and the developed PS plate 12 is sent to the washing section 16 by a pair of transport rollers 28 .

The PS plate 12 sent out from the transport roller pair 28 is inserted between the transport roller pair 68.

The PS plate 12 inserted into the transport roller pair 68 is transported in a substantially horizontal direction and inserted between the transport roller pair 70. During this conveyance, the PS plate 12 is washed by supplying washing water to both upper and lower surfaces thereof through the spray pipes 72 and 74. After being washed with water, the PS plate 12 is inserted between a pair of conveyance rollers 90, sent out between a pair of conveyance rollers 92, and desensitized by a desensitizing section 18.
It is conveyed in a substantially horizontal direction above. During this conveyance, a desensitizing treatment liquid is applied by spray pipes 94 and 96. The PS plate 12 coated with the desensitizing treatment liquid is sent out of the photosensitive planographic printing plate processing apparatus 10 by a pair of transport rollers 92 and is transported to a drying device (not shown).

Although the scrubbing member 34 is used in this embodiment, this scrubbing member may be a brush.

Further, in this embodiment, a case has been described in which the PS plate 12 is conveyed in the horizontal direction, but it may be conveyed in a direction other than the horizontal direction (for example, in the vertical direction).

[Effects of the Invention] As explained above, the present invention provides a photosensitive planographic printing plate development processing method and apparatus for developing a photosensitive planographic printing plate on which an image has been printed. The photosensitive lithographic printing plate is developed by supplying a predetermined amount of substantially unused developer and spreading the supplied developer onto the plate surface using a rubbing member, so that the photosensitive lithographic printing plate can be exposed to light using the minimum amount of developer necessary. An excellent effect can be obtained in that both the upper and lower surfaces of the lithographic printing plate can be reliably developed.

[Brief explanation of the drawing]

FIG. 1 is a schematic configuration diagram showing an embodiment of a photosensitive planographic printing plate processing apparatus to which the present invention is applied, and FIG. 2 is a perspective view showing a developer rubbing means. 10... Photosensitive planographic printing plate processing device, 12... PS
Plate, 14... Developing section, 24... Developer, 30, 32... Developer rubbing means.

Claims (2)

[Claims] (1) A photosensitive lithographic printing plate development method and apparatus for developing a photosensitive lithographic printing plate on which an image has been printed, wherein a predetermined amount of substantially unused developer is applied to the plate surface of the photosensitive lithographic printing plate. A method for developing a photosensitive lithographic printing plate, which comprises developing the photosensitive lithographic printing plate by spreading the supplied developer onto the plate surface using a rubbing member while supplying the developer. (2) A photosensitive planographic printing plate development method and apparatus for developing a photosensitive planographic printing plate on which an image has been printed, wherein a predetermined amount of substantially unused developer is applied to the surface of the photosensitive planographic printing plate. A photosensitive lithographic printing plate development processing apparatus comprising a supplying means and a rubbing member for spreading the supplied developer onto the surface of the photosensitive lithographic printing plate.