JPH02220055A - Developing device for waterless planographic plate - Google Patents

Abstract

PURPOSE:To surely sqeeze coloring liquid from a waterless planographic plate to which coloring is performed by disposing a water-repellent roll at the exit of a coloring part. CONSTITUTION:Conveying roller pairs 94 and 96 are arranged on the upper part of a coloring tank main body 90 in order from a side where the waterless PS plate 12 gets in the coloring tank main body 90 along the conveying direction of the PS plate 12. The conveying roller pair 94 is formed of general rubber and the conveying roller pair 96 is formed of silicone rubber. Then, the surface of the conveyed waterless PS plate is prevented from being damaged. Since the conveying roller pair 96 is formed of silicone rubber, it has good water repellency. The coloring liquid 17 is repelled from the surface of the non-image part of the PS plate 12 and the excess coloring liquid 17 is surely removed.

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a waterless lithographic printing plate (hereinafter referred to as "waterless PS plate") that is developed in a developing section and then dyed in a dyeing section. None Regarding a lithographic printing plate developing device.

[Prior art] Regarding waterless PS plates using a silicone layer as an ink repellent layer, Japanese Patent Publication No. 44-23042 and Japanese Patent Publication No. 46-160
44, a waterless PS plate in which a photo-soluble or photo-insolubilizable photosensitive layer and a silicone rubber layer are laminated on a substrate, as well as JP-A-48-94504 and JP-A-50-5010.
A waterless PS plate described in No. 2 has been proposed in which a photoadhesive photosensitive layer and a silicone rubber layer are laminated on a substrate. These can print tens of thousands of sheets without using dampening water.

In the developing section of the developing device, after the developer is applied onto the waterless 28 plate while being conveyed by a pair of conveying rollers,
The surface is rubbed with a brush roller and the photosensitive layer corresponding to the image area is scraped off. Waterless P after processing in the developing section
The S plate is conveyed to the dyeing section by a pair of conveyance rollers, and while being conveyed, a staining liquid is applied to the portion corresponding to the image area and subjected to the dyeing process.

After being dyed with the staining solution, the waterless PS plate is held and conveyed by a pair of squeeze rollers and squeezed, and the staining solution remaining on the surface, especially the staining solution adhering to the non-image area, is squeezed out.

[Problems to be solved by the invention] However, since the pair of squeeze rollers that squeeze the waterless PS plate after dyeing are made of EPT rubber or the like,
Waterless P with low ability to repel excess staining solution (water repellency)
It was not possible to reliably squeeze out the staining solution from the S plate.

For this reason, the staining solution remained on the waterless PS plate, especially in non-image areas, impairing the ability to repel ink during printing, making it impossible to print well.

The present invention has been made in consideration of the above facts, and an object of the present invention is to obtain a waterless planographic printing plate developing device that can reliably squeeze out the dyeing solution from a waterless planographic printing plate after dyeing.

Means and Effects for Solving the Problems The present invention provides a waterless lithographic printing plate developing device in which a waterless lithographic printing plate is developed in a developing section and then dyed in a dyeing section. The present invention is characterized in that a highly water-repellent roller is disposed in the waterless planographic printing plate and comes into contact with the plate surface of the waterless planographic printing plate to squeeze the waterless planographic printing plate and squeeze out the dyeing solution.

As a result, after the waterless lithographic printing plate is dyed, a highly water-repellent roller such as a pair of silicone rollers or a pair of fluororesin rollers repels the excess dyeing liquid and squeezes the dyeing liquid from the plate surface. will be removed.

[Embodiment] FIG. 1 shows an embodiment of a waterless lithographic printing plate developing apparatus 10 to which the present invention is applied. This waterless lithographic printing plate developing apparatus 10 includes a developing section 14 and a staining section 16, and is an apparatus that performs a staining process for plate inspection work after developing the waterless 23 plate 12.

The waterless 23rd edition 12 used here is a patent application published in 1986-86.
177, in which a primer layer, a photosensitive layer, a silicone rubber layer, and a protective film are sequentially laminated on a substrate is used.

Further, the developer 18 used in the developing section 14 is
317843, an aqueous developer containing an organic solvent proposed in Japanese Patent Application No. 63-86177 is used. The staining solution 17 used in the staining section 16 includes a staining solution 1 containing crystal violet, astrazone red, etc.
7 is used.

The developer tank body 20 of the developer section 14 opens upward,
The bottom is formed in an inverted mountain shape, and a developer recovery tank 22 is formed in the center of the bottom. The developer 18 is contained in the developer recovery tank 22 .

Pairs of transport rollers 24, 26, and 28 are arranged at the top of the developer tank body 20 in order from the waterless PS plate 120 entry side. The pair of conveyor rollers 24, 26, and 28 are supported by a rack side plate (not shown), rotate by the driving force of a driving means (not shown), and are configured to grip and convey the waterless 23 plate 12 in the counterclockwise direction in FIG. It has become. Conveyance roller pair 24.26
．． 28 is a waterless 28 plate 120 made of a general material (silicone, EPTSNBR, etc.) and transported in the direction of arrow A.
It is designed not to damage the surface. Conveying roller pair 28
is disposed at the end of the transport path of the waterless 23rd plate 12 in the developing section 14 and has the role of a squeeze roller that squeezes out the developer from the waterless 23rd plate 12.

A brush roller 30 is arranged between the transport roller pair 26 and the transport roller pair 28. This brush roller 30 is for scraping off the photosensitive layer and silicone layer corresponding to the image area on the plate surface by rubbing the plate surface of the waterless 23 plate 12 being conveyed. The brush roller 30 is also supported by a side plate (not shown) in the same way as the pair of conveying rollers 24, 26, 28, and the driving force of a driving means (not shown) is transmitted thereto, so that the brush roller 30 rotates in a direction opposite to the rotation direction of the pair of conveying rollers 24, 26, 28 (first 1
(counterclockwise in the figure).

The brush roller 30 is formed by planting a brush material on a plastic or metal roll, and rotates in the forward direction (counterclockwise in Figure 1) with respect to the conveying direction of the waterless 23 plate 12, thereby eliminating water. It is designed to rub the surface of 23rd edition 12. The number of rotations of this brush roller 30 is 100 to 5
00 rpm (preferably 200 to 400 rpm).

Further, by rotating the brush roller 30 and reciprocating it in the axial direction, the effect of scraping off the photosensitive layer and silicone layer on the waterless 25 plate 120 plate surface is further improved.

A support stand 32 made of a relatively flexible material such as plastic, such as high-density polyethylene, is disposed below the brush roller 30. Alternatively, a rubber roller may be used. When the waterless 28 plate 12 passes, the receiver is placed on the stand 32 and the waterless 28 plate 12 passes.
8th edition 12. While being supported, the surface is rubbed by the brush roller 30 to ensure that the photosensitive layer and silicone layer corresponding to the image area are scraped off.

A spray pipe 34 is arranged above the transport roller pair 24. This spray pipe 34 is provided with discharge ports 34A at appropriate intervals along the axial direction, facing the upper roller of the pair of transport rollers 24. This spray pipe 34 is communicated with a developer supply device, which will be described later, through a conduit 38 via a valve 36. As a result, the developer 18 is sent to the spray pipe 34, and the conveying roller pair 2
Discharge the developer 18 to the upper roller of 4 to create a waterless PS.
A developer 18 is applied onto the plate 12.

Spray pipes 40 and 42 are also arranged between the transport roller pair 26 and the transport roller pair 28. The spray pipe 40 is disposed between the brush roller 30 and the conveying roller pair 26, and has a discharge port 40A formed therein similarly to the spray pipe 34. A discharge port 40A of the spray pipe 40 is provided facing the brush roller 30. Like the spray pipe 34, this spray pipe 40 is also connected to a developer supply device, which will be described later, via a valve 36 through a pipe line branching from the pipe line 38. As a result, the developer 18 is sent to the spray pipe 40,
The developer 18 is discharged and supplied to the brush roller 30.

Further, the spray pipe 42 has a discharge port 42A formed opposite to the upper roller of the pair of transport rollers 28. This spray pipe 42 also communicates with a developer supply device, which will be described later, through a pipe line branching from the pipe line 38 via a valve 36. As a result, developer 1 is transferred to the spray pipe 40.
8 is fed in, and the developer 18 is discharged to the upper roller of the pair of transport rollers 28.

A cover 39 having a substantially U-shaped cross section is disposed to extend from the conveying roller pair 26 to the upper part of the brush roller 30.

This cover 39 prevents the developer 18 from being scattered by the brush roller 30 to other areas.

The developer supply device includes a circulation pump 44, a filter 46,
Pipe line 4 communicating circulation pump 44 and developer recovery tank 22
It consists of 8.

The circulation pump 44 is a variable flow rate pump, and the control device 52
and its discharge flow rate is controlled. A pipe line 38 is connected to the discharge port side of the circulation pump 44, and one end of the pipe line 48 is connected to the suction port side. The other end of the pipe 48 is communicated with the bottom of the developer recovery tank 22 via a valve 55 in the middle.

By the operation of this circulation pump 44, the developer recovery tank 22
The developer solution 18 in the tank is sucked through line 48 into circulation pump 44 and then through line 38 into spray pipe 34.4.
0.42.

A flow rate sensor 50 is disposed in the middle of the conduit 38,
The flow rate of the developer 18 passing through the pipe line 38 is detected. This flow rate sensor 50 is connected to a control device 52, and is adapted to transmit the flow rate detection result of the developer 18. Although a general flow meter can be used as the flow rate sensor 50, a rotary type is preferable in order to downsize the device.

Further, a bypass line 51 is provided between the flow rate sensor 50 and the circulation pump 44, and an electrical conductivity detector 54 is disposed in the middle of this line 51. This electrical conductivity detector 54 is adapted to detect the electrical conductivity of the developer passing through the pipe line 38. The electrical conductivity detector 54 is connected to the control device 52 and transmits detection results to the control device 52. This electrical conductivity detector 54 uses a generally known conductivity sensor.

A filter 46 is disposed in the middle of the pipe 48, and filters dirt (mainly waterless PS plate 120) in the developer passing through the pipe 48.
The photosensitive layer scraped from the surface and development residue from the silicone layer are filtered out.

A notification device 56 is connected to the control device [52], and is configured to notify that it is time to replace the filter 46 when the flow rate of the developer 18 passing through the pipe 38 falls below a predetermined value. This allows the filter 46 to be replaced. The mesh size of this filter 46 is 10μ to 500μ (preferably 10μ
0μ to 300μ) are used. Also, pipe line 4
A valve 55 is disposed in the middle of the pipe 8 to open and close the pipe line 48.

A branch pipe line 58 branches off from the middle of the pipe line 48 and communicates with an overflow tank 62 via a valve 60. The overflow tank 62 is disposed on the side of the developer recovery tank 22, is provided on a partition wall of the developer recovery tank 22, and communicates with the developer recovery tank 22 through a long hole 64 along the developer surface.

As a result, the surface layer of the developer 18 in the developer recovery tank 22 flows over the upper end of the lower partition wall 22A of the developer recovery tank 22 into the overflow tank 62. The overflow flow rate of the developer 18 into the overflow tank 62 is 1/3 to 1 of the total circulating amount of the developer 18.
(preferably 1/2 or more).

Further, the upper partition wall 22B allows the developer 18 to be replenished by a developer replenishing device described later, and when the liquid level of the developer 18 rises, the developer residues once collected in the overflow tank 62 can be removed from the developer recovery tank 22. We are trying to prevent it from spreading.

The overflow tank 62 is opened at the top to form an opening, which is opened and closed with a lid 66, and is removed from the opening when maintenance is performed inside the overflow tank 62.

The upper part of the side wall 68 of the overflow tank 62 is inclined to form an inclined wall 68A. A branch pipe line 58 is communicated through the lower part of the side wall 68, and the developer 18 in the overflow tank 62 is sucked by the operation of the circulation pump 44. This suction causes the developer 18 to flow in the direction of arrow B along the inclined wall 68A. Also, due to the suction of the circulation pump 44, the surface layer of the developer 180 in the developer recovery tank 22 flows into the overflow tank 62.
The developer debris floating in the developer 18 in the developer recovery tank 22 flows into the overflow tank 62, where the debris is collected and sent into the pipe line 58 by the flow caused by the inclined wall 68A. ing. In this case, a silicone rubber layer is laminated on the surface of the waterless PS plate 12 for ink repelling, and when this silicone rubber layer is scraped off by the brush roller 30 together with the photosensitive layer corresponding to the image area, development residue is removed. The excess developer 18
The developer is also collected into the developer collection tank 22.

In the developer in the developer recovery tank 22, the developer scum floats to the surface layer of the developer 18 because its specific gravity is lower than that of the developer 18. Further, the lower partition wall 22A functions as a so-called weir, in which developer residue on the surface layer in the developer recovery tank 22 flows into the overflow tank 62 and is collected therein.

In addition, an overflow pipe 70 is provided in the overflow tank 62.
is installed. The lower end of this overflow pipe 70 penetrates the bottom of the overflow tank 62 and protrudes outward, and the upper end is connected to the lower partition wall 22A of the developer recovery tank 22.
Higher than the upper end (and lower than the lower end of the upper partition wall 22B)
It is set. Therefore, when the developer 18 is replenished by the developer replenisher described later and the liquid level of the developer 18 in the developer recovery tank 22 rises, the surface layer of the developer 18 in the over-moro tank 62 is Together with the dregs, it flows outward through an overflow pipe 70.

The developer replenishing device includes a developer solution tank 72 containing a developer solution, a water tank 74 containing water, a developer solution supply pump 76 for supplying the developer solution into the developer recovery tank 22, and a developer solution supply pump 76 for supplying the developer solution into the developer recovery tank 22. It is configured with a water supply pump 78 for supplying the developer into the developer recovery tank 22.

One end of a pipe line 80 is connected to the developer stock tank 72, and the other end is connected to a wide-mouth pipe line 8 disposed in the developer recovery tank 22.
It opens to 2. A developing stock solution supply pump 76 is disposed in the middle of this conduit 80 . This developing solution supply pump 76 is connected to the control device 52, so that the timing of its operation is controlled.

The water tank 74 is connected to one end of a pipe line 84, and the other end opens to a wide-mouth pipe line 82 in the developer recovery tank 22.

A water supply pump 78 is disposed in the middle of this pipe line 84. This water supply pump is connected to a control device 52 so that the timing of its operation is controlled.

Further, an aluminum detector 86 is connected to the control device 52, which is disposed on the entrance side of the developing section 140 and detects the amount of waterless 28 plates 120 passed through, that is, the amount of processing (area of waterless PS plates 120). The quantity is supplied to a control device 52. This aluminum detector 86 uses a phototube as a waterless PS
Plate 120 Plural pieces are arranged along the width direction, waterless 23 plate 1
The area on the plate surface may be detected by measuring the time it takes for the waterless plate 12 to pass through the top of the aluminum detector 86, and the length of the waterless plate 12 in the width direction may be input into the device in advance
The area may be detected by detecting the length with one phototube.

Further, a heater 88 is arranged at the bottom of the developer recovery tank 22 . This heater 88 is connected to a power source (not shown) to heat the developer 18. This heater 88 sets the temperature of the developer at 15° to 45° (preferably 25° to 30°).

Furthermore, the development time using this device is set to 10 seconds to 3 minutes (preferably 30 seconds to 2 minutes), and the staining time is set to 5 seconds to 1 minute (preferably 10 seconds to 30 seconds). There is.

Next, the dyeing section 16 will be explained.

The dye tank main body 90 of the dyeing section 16 opens upward like the developer tank main body 20, has an inverted mountain-shaped bottom, and has a dye solution recovery tank 92 formed in the center of the bottom. The staining liquid 17 is accommodated in the staining liquid recovery tank 92 . An overflow pipe 91 is disposed within the dyeing solution recovery tank 92. The upper end of this overflow pipe 91 is located in the upper part of the dye solution recovery tank 92, and the lower end penetrates the bottom of the dye solution recovery tank 92 and projects outward. When the liquid level in the dyeing solution recovery tank 92 rises and exceeds the upper end of the overflow tube 91 due to replenishment of the dyeing solution 17 by a dyeing solution replenishing device described later, the dyeing solution 17 is transferred to the dyeing solution recovery tank. The liquid level height of the staining liquid 17 is set by discharging it from inside the staining liquid 92 to the outside.

At the top of the dyeing tank main body 90, transport roller pairs 94 and 96 are arranged in order along the transport direction of the waterless 23rd printing plate 12 from the entrance side of the waterless 23rd printing plate 12 into the dyeing tank main body 90.

The pair of transport rollers 94 and 96 are supported by a rack side plate (not shown), are rotated by the driving force of a driving means (not shown), and are designed to nip and transport the waterless 23 plates 12. The conveyor roller pair 94 is made of general rubber (polybutadiene rubber = BR, ethylene propylene rubber = EPT).

The transport roller pair 96 is molded from silicone rubber. This prevents the surface of the waterless PS plate being transported from being damaged. In addition, since the conveyance roller 96 is made of silicone rubber, it has good water repelling ability, i.e., water repellency, and repels the staining liquid 17 from the surface of the non-image area of the waterless 23 plate 12, thereby ensuring that excess staining liquid 17 remains. It is designed to remove. The hardness of the pair of transport rollers 96 is preferably 50 degrees or less, preferably 40 degrees or less. Further, in this embodiment, the conveying roller pair 96 is a silicone roller pair, but the present invention is not limited to this, and other rollers may be used as long as they are made of a material with high water repellent properties such as fluororesin.

In addition, in this embodiment, a pair of transport rollers 96 are arranged as squeeze rollers on the downstream side of the brush roller 100, but in order to reliably squeeze out the dyeing solution on the surface of the waterless 23 plate 12, one or more pairs are arranged. It's okay.

Further, in this embodiment, a pair of rollers are used as the squeeze rollers, but the present invention is not limited to this, and the rollers may be used only on the plate surface, and a roller other than the rollers may be used on the back surface side.

Further, a pair of conveying rollers 98 is arranged on the downstream side of the dyeing tank main body 90 in the conveying direction of the waterless 23 plate 12. The transport roller pair 98 is made of a roll material such as NBR rubber or tolyl butadiene rubber, and the squeezing property of the dyeing liquid 17 is improved. The conveying roller pair 98 may be made of silicone resin, and preferably has a surface that is highly water-repellent. That is, it is preferable to use a material that has a good squeezing effect for squeezing the staining liquid 17. The hardness of the pair of transport rollers 98 is preferably 50 degrees or less, preferably 40 degrees.
It is better to have less than 1 degree.

Further, in this embodiment, one pair of conveyance rollers 98 are provided on the downstream side of the dyeing tank main body 90, but the invention is not limited to this, and one or more pairs may be provided. You can squeeze it.

Furthermore, the clamping pressure of the waterless 23 plate 12 of the above-mentioned transport roller pair 94,96,98 is 0.1 to 20 kg/cn!
(preferably set to 0.5 to 10 kg/cnf). In addition, when these conveyor roller pairs are made of silicone rollers, the contact angle of these rollers is 20°~
Set at 90° (preferably 40° or more), NBR
When using rollers such as
° is preferred.

A brush roller 100 is arranged between the transport roller pair 94 and the transport roller pair 96. The brush roller 100 is also supported by a side plate (not shown) in the same way as the pair of conveying rollers 94.96, and the driving force of a driving means (not shown) is transmitted thereto, so that the brush roller 100 rotates in a direction opposite to the rotational direction of the pair of conveying rollers 94.96 (clockwise in FIG. 1). ). This brush roller 1
00 is formed by planting brush material on a plastic or metal roll, and by rotating in a direction (clockwise in Figure 1) that resists the conveyance direction of the waterless 23rd version 12, the waterless 23rd version is created. It is designed to rub 12 surfaces. Further, depending on the case, it may be rotated in the forward direction with respect to the conveyance direction of the waterless 23 plate 12. The rotation speed of the brush roller 100 is 100 to 500 rpm (preferably 200 to 4
00 rpm). Furthermore, it is preferable to install a vignetting prevention bar to prevent vignetting in the waterless PS version.

A support stand 102 made of a relatively flexible material such as plastic, for example high-density polyethylene, is arranged below the brush roller 100.

Therefore, when the waterless 23rd plate 12 passes, the receiver is placed on the stand 10.
While the waterless plate 12 is being guided on the plate 2, the staining liquid 17 is applied to the surface by a brush roller 100.

A spray pipe 104 is installed above the brush roller 100.
is installed. This spray pipe 104 is surrounded by a substantially U-shaped rectifying plate 106.

A suitable number of discharge ports 104A are formed in the spray pipe 104 along the axial direction, facing the current plate 106.

This spray pipe 104 is connected via a valve 108 to a dye solution supply device to be described later through a conduit 110. As a result, the dyeing liquid 17 is fed into the spray pipe 104 and is discharged toward the current plate 106.
The dye liquid 17 is supplied to the brush roller 100 while being guided by the brush roller 100 . At this time, the dyeing liquid 17 spreads on the current plate while flowing down on the current plate 106, and is uniformly supplied onto the brush roller 100.

A spray pipe 112 is also arranged between the brush roller 100 and the conveying roller pair 96 on the conveying roller pair 96 side. This spray pipe 112 is also the spray pipe 104.
Similarly, it is surrounded by a substantially U-shaped rectifying plate 106. This spray pipe 112 has a discharge port 112A connected to the rectifier plate 10.
6, a plurality of them are provided along the axial direction at appropriate intervals. Spray pipe 112 is spray pipe 1
Similarly to 04, it is connected via a valve 108 to a stain solution supply device to be described later through a conduit 110. As a result, the dyeing liquid 17 is fed into the spray pipe 112, discharged toward the rectifying plate 106, guided, and supplied to the upper roller of the pair of transport rollers 96. At this time, the dyeing liquid 17 spreads while flowing down on the rectifying plate 106 and is uniformly supplied to the pair of conveying rollers 96.

A cover 107 having a substantially U-shaped cross section is arranged above the brush roller 100 and the conveying roller pair 96. This cover 107 prevents the staining liquid 17 from being scattered by the brush roller 100.

The dye solution supply device includes a circulation pump 114 and a filter 116.
and a conduit 118 that communicates the circulation pump 114 and the dye solution recovery tank 92. A pipe line 110 is connected to the discharge port side of the circulation pump 114, and a pipe line 1 is connected to the suction port side.
One end of 18 is connected. The other end of the pipe line 118 is communicated with the bottom of the dyeing solution recovery tank 92. By the operation of this circulation pump 114, the dyeing solution 1 in the dyeing solution recovery tank 92 is
7 is sucked into the ring pump 114 through line 118, and into the spray vibe 104.112 through line 110.
It is now sent to.

A filter 116 is disposed in the middle of the conduit 118,
The staining solution 17 passing through the conduit 118 is designed to remove mainly the dregs from the photosensitive layer and silicone layer scraped off the surface of the waterless 23 plate 12 brought in from the developing section.

The staining liquid replenishing device includes a staining liquid tank 12 containing the staining liquid.
2, and a dye solution supply pump 124 for supplying the dye solution 17 into the dye solution recovery tank 92.

One end of a conduit 126 communicates with the dyeing solution tank 122, and the other end opens into a wide-mouthed conduit 82 disposed within the dyeing solution recovery tank 92. A dye solution supply pump 124 is disposed in the middle of this pipe line 126. This dye solution supply pump 124 is connected to a control device 52, so that the timing of its operation, that is, the operation when replenishing the dye solution 17 is controlled. The replenishment amount of staining solution 17 is 5 to 100cc.
/me (preferably 10 to 60 cc/m").

A heater 88 is disposed at the bottom of the dyeing solution recovery tank 92, and is connected to a power source (not shown) to heat the dyeing solution. The temperature of this staining liquid 17 is 15 to 45°C.
(Preferably set at 20 to 30°C). Also, the number of dyeing tanks can be increased as necessary.

Next, the operation of this embodiment will be explained.

The waterless 23rd plate 12 on which the image has been printed is inserted into the developing section 14 after passing above the aluminum detector 86 using an image printing apparatus (not shown). The portion of the photosensitive layer of the waterless 23 plate 12 inserted into the developing section 14 that is irradiated with light, that is, the exposed portion, hardens and adheres to the brimer layer, and the unexposed portion becomes swellable by the developer 18. ing.

From this state, after peeling off the protective film laminated to protect the surface of the waterless PS plate 120, the waterless 23rd plate 12 is inserted into the developing section 14, and is conveyed by the pair of conveying rollers 24 of the developing section 14. Meanwhile, the developer 18 is applied to the surface. As a result, the photosensitive layer in the unexposed area (image area) of the waterless 23rd plate 12 swells and becomes easily peeled off from the brimer layer.

Further, the waterless 23rd plate 12 is pinched and conveyed by a pair of conveying rollers 26, and a brush roller 30 and a receiver are inserted between a table 32. The brush roller 30 rotates in a direction that follows the conveying direction of the waterless 23rd plate 12 (counterclockwise in FIG. 1), and the receiver rubs the upper surface of the waterless 23rd plate 12 passing on the table 32. The developer 18 is also supplied to this brush roller 30.
The surface of the waterless 23 plate 12 is rubbed by a brush roller 30 while being coated with the developer 18, and the photosensitive layer and silicone rubber layer swollen by the developer 18 are scraped off. As a result, a photosensitive layer and a silicone layer corresponding to exposed areas (non-image areas) remain on the waterless 23rd plate 12, and a positive image is formed.

After the developer 18 applied to the surface of the waterless PS plate 120 is developed, the surplus developer 18 falls into the developer collection layer 22 and is collected.

Further, the waterless layer 23 is removed by the brush roller 30 from which the photosensitive layer and the silicone layer in the unexposed area (image area) are scraped off.
The plate 12 is held and conveyed by a pair of conveying rollers 28, and the developer 18 is applied again, and the developer 18 is squeezed out from the waterless plate 12.

The waterless 23rd plate 12 in this state is inserted between the pair of transport rollers 94 in the dyeing section 16. The waterless 23rd plate 12 is conveyed by the pair of conveying rollers 94 by the brush roller 10.
0 and the receiver are inserted between the stand 102. This brush roller 100 rotates in a direction (clockwise in FIG. 1) counter to the conveyance direction of the waterless 23rd plate 12, and applies the dyeing solution supplied while being guided by the current plate 104 to the upper surface of the waterless 23rd plate 12. do.

Further, depending on the case, the brush roller 100 may rotate in the forward direction with respect to the conveyance direction. As a result, the staining liquid adheres to the primer layer, that is, the unexposed area (image area), and the dyeing is carried out.

Further, the waterless 23rd plate 12 is inserted between the pair of conveying rollers 96 1, and the rectifying plate 10 is transferred to the upper roller of the pair of conveying rollers 96.
The dyeing liquid 17 guided and supplied by the dyeing liquid 6 is applied to the surface, and the dyeing liquid 17 is squeezed out. This staining is a process to make it easier to distinguish between the image area and the non-image area, as the surfaces of the image area and non-image area of the waterless 23 plate 12 after development are the same color. This is the process that is carried out.

After the waterless 23 plate 12 with the image area dyed is sent out from the dyeing section, it is inserted between a pair of transport rollers 98, and the staining solution 17 remaining on the surface is squeezed out. Since this pair of transport rollers 98 is made of NBR rubber or the like, the dyeing liquid 1
The wiping performance of No. 7 is improved. Especially in the non-image area, stain 17
If it remains, the ink repulsion force of the silicone rubber layer will decrease, making it impossible to obtain a good image during printing.However, since the dyeing liquid 17 is reliably squeezed from the surface by the pair of transport rollers 98, a good image can be obtained. can be obtained.

Next, the circulation of the developer 18 in the developing section 14, removal of residue, and replenishment of the developer 18 will be explained.

Circulation> As shown in FIG. 1, the developer 18 in the developer recovery tank 22 is sent to the spray vibrator 34, 40, 42 by the operation of the circulation pump 44, and the water conveyed through the developer section 14 is None 23 Coated on plate 12. The excess developer 18 after coating the waterless 23rd plate 12 falls into the developer collection tank 22.
It is collected inside.

There is no water in the developer collected into the developer recovery tank 22.
Development scum from the photosensitive layer, silicone rubber layer, etc. that has peeled off from the surface of the S plate 120 is mixed in, and these scum floats on the surface layer within the developer recovery tank 22 because the specific gravity of these scum is lighter than water.

Dust Removal> In this state, the developer 18 in the developer recovery tank 22 flows into the overflow tank 62 over the lower partition wall 22A. Therefore, the developer residue floating on the surface layer of the developer 18 flows into the overflow tank 62 and is collected in the overflow tank 62 .

On the other hand, the developer 18 in the overflow tank 62 is sucked in from the branch pipe 58 by the operation of the circulation pump 44, and this suction forms a flow along the inclined wall 68A in the overflow tank 62. As a result, the developer particles collected in the overflow tank 62 are guided into the branch pipe 58 along the flow in the direction of the arrow B shown in the figure. The developer 18 containing a large amount of developer residue sucked into this branch pipe 58 passes through the filter 46 to remove the residue in the developer 18 and is returned to the spray pipe 34, 40, 42 by the pipe 38. sent to.

If the filter 46 should become clogged with developer residue, the flow rate of the developer 18 passing through the pipe line 38 will decrease. The flow rate sensor 50 detects this and transmits the detection result to the control device 52. The control device 52 operates the notification device 56 to notify that the filter 46 is clogged. This allows the operator to replace the filter 46 with a new one.

When the developing solution or water is further replenished into the developing solution collecting tank 22, the liquid level of the developing solution 18 in the developing solution collecting tank 22 rises, the elongated hole 64 is submerged, and the overflow tank 62
Developer solution 18 inside (development residue is collected on the surface layer)
The height of the liquid level also rises, causing the upper end of the overflow i-tube 70 to be submerged.

As a result, the developer 18 in the overflow tank 62 is discharged from the surface layer (in which developer residue is floating) to the outside through the overflow pipe 70.

At this time, the upper partition wall 22B of the developer recovery tank 22 in which the elongated hole 64 is formed acts as a weir, and the overflow tank 62
The developer residue once collected inside will not be diffused into the developer recovery tank 22 due to a rise in the liquid level due to replenishment of the developer stock solution or water.

In this way, in this embodiment, there are two circulation routes, the branch pipe line 58 and the pipe line 48, and since developer residue can be removed from the developer solution 18, the developer collection tank 22 and the circulation pump 44 are There is no accumulation of development residue, making maintenance easier.

Developing Solution Replenishment> The aluminum detector 86 detects the waterless 23 plate 12 inserted into the developing section 14, and the processing amount is detected.

Based on this detection result, the control device 52 operates the developer supply pump 76 to supply the developer solution into the developer recovery tank 22 . This replenishment is carried out in accordance with the processing amount, that is, the area, of the waterless 23 plate 12, and is intended to recover the deterioration of the developer 18 caused by processing. This replenishment amount is 5 to 500 cc
/rn' (preferably 20 to 200 cc/m'').

Furthermore, the electrical conductivity of the developer 18 is detected by an electrical conductivity detector 54, and this result is transmitted to the control device 52. This allows the amount of water in the developer 18 to be detected. When the water in the developer 18 evaporates and concentrates, the electrical conductivity of the developer 18 increases, and when it reaches a predetermined value or more, the controller 52 operates the water supply pump 78,
Water is supplied into the developer recovery tank 22. The amount of water supplied is set to 500 to 1000 cc/time. This prevents concentration of the developer 18, replenishes the area of the developer stock solution, and maintains the activity of the developer 18 constant, making it possible to perform stable development over a long period of time.

Next, replenishment of the staining solution 17 in the staining section 16 will be explained.

A developer remains on the surface of the waterless 23 plate 12 inserted into the staining section 16, and the staining solution 17 is applied in this state. For this reason, the developer is carried into the dyeing solution collected in the dyeing solution recovery tank 92 after dyeing, and the dyeing solution 17 deteriorates. Furthermore, the staining solution 17 deteriorates depending on the amount of dyeing processed by the waterless 23rd plate 12. Therefore, based on the detection result of the waterless PS plate 120 area by the aluminum detector 86, the control device 5
2 operates the dyeing solution supply pump 124 to remove the dyeing solution recovery tank 9.
A staining solution 17 is supplied into the interior of the container 2. As a result, the staining solution 17
The dyeing ability of the dye does not deteriorate, and stable dyeing processing can be carried out over a long period of time.

[Effects of the Invention] In the present invention having the above-described structure, a water-repellent roller is disposed at least at the outlet of the dyeing section, so that the dyeing solution can be reliably squeezed out from the waterless lithographic printing plate after dyeing. You can get excellent results.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing an embodiment of a waterless lithographic printing plate developing apparatus according to the present invention. 1G...waterless planographic printing plate developing device, 12...waterless planographic printing plate (PS plate), 14...developing section, 16...staining section, 90...staining tank body, 94. 96.98, ... Conveyance roller pair.

Claims (1)

[Claims] (1) A waterless lithographic printing plate developing device that develops a waterless lithographic printing plate in a developing section and then dyes it in a dyeing section, the device being disposed at an outlet of the dyeing section to develop the waterless lithographic printing plate. A waterless lithographic printing plate developing device characterized by being provided with a highly water-repellent roller that comes into contact with the plate surface and squeezes the waterless lithographic printing plate to squeeze out the dye solution.