JPH0738916Y2 - Foaming prevention structure of photosensitive lithographic printing plate processor - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention develops a photosensitive lithographic printing plate in a developing tank, and the developed photosensitive lithographic printing plate is a processing tank such as a washing tank and a desensitizing processing tank. The present invention relates to a foaming prevention structure of a photosensitive lithographic printing plate processing machine which is applied to a photosensitive lithographic printing plate processing machine for treating with a processing solution and prevents the processing solution in these processing tanks from foaming.

[Prior Art] An image-printed photosensitive lithographic printing plate is generally developed in a developing tank, rinsed in a washing tank, and then subjected to a finish treatment in a desensitizing tank. As such a photosensitive lithographic printing plate, there is one in which a photosensitive material is applied to one surface or both surfaces of a rigid support such as an aluminum plate or a plastic plate.

For example, the washing process in the washing tank is performed as follows.

A washing liquid is stored in the washing tank, and the washing liquid is guided to the upper side of the washing tank by a circulation pump, discharged from a spray pipe provided above, dropped into the washing tank, and returned to the washing tank again. It is like this. Since the circulation pump is usually operated at the same time when the photosensitive lithographic printing plate processing machine is operated, the washing liquid is always kept in circulation. In this way, in the circulating state, the washing liquid discharged from the pipe is supplied to the photosensitive lithographic printing plate that has been conveyed and reached above the washing tank. In this manner, the photosensitive lithographic printing plate is washed with water.

In the fining process in the desensitizing tank and the developing process in the developing tank, the fining solution and the developing solution are circulated through a circulation pump and a spray pipe in the same manner as the washing process.

[Problems to be solved by the invention] On the other hand, the photosensitive lithographic printing plate is continuously conveyed through processing tanks such as a developing tank, a water washing tank, and a desensitizing processing tank. The washing liquid will be sequentially brought into the desensitizing tank. The developer contains a surfactant, and the surfactant is carried into the washing bath and into the desensitizing tank via the washing bath. A treatment liquid such as a washing liquid or a finisher liquid into which the surfactant is brought in is easily foamed by spraying or the like.

Therefore, in a processing tank such as a washing tank, the processing liquid discharged from the spray pipe and falling on the surface of the processing liquid in the processing tank has a particularly large impact force especially when the photosensitive lithographic printing plate is not in the processing tank. This results in bubbling the processing liquid.

As a result, problems such as foamed processing liquid overflowing and flowing out to other processing tanks or outside may occur, and bubbles may be attached to the photosensitive lithographic printing plate, resulting in uniform processing liquid treatment of the photosensitive lithographic printing plate. However, there is a problem in that it causes problems such as uneven processing.

For this reason, conventionally, as disclosed in JP-A-58-202444, a treatment plate is disposed by inclining it between the treatment liquid surface in the treatment tank and the treatment liquid discharge port of the spray pipe. Although it was possible to prevent foaming of the liquid, it was not possible to completely prevent foaming.

In consideration of the above facts, the present invention has an object to obtain a foaming-preventing structure of a photosensitive lithographic printing plate processing machine, which enables uniform processing of a processing liquid of a photosensitive lithographic printing plate and can prevent occurrence of uneven processing.

[Means for Solving Problems] The present invention is to develop a photosensitive lithographic printing plate on which an image is printed with a developing solution in a developing tank, and treat the developed photosensitive lithographic printing plate with a processing solution in a processing tank. Used in a photosensitive lithographic printing plate processing machine, which is a foaming prevention structure of the photosensitive lithographic printing plate processing machine for preventing foaming of the processing liquid, and guiding the processing liquid in the processing tank An adjusting means for adjusting the discharge amount of the processing liquid supply means which is discharged above the processing liquid surface and is supplied to the photosensitive lithographic printing plate surface, and a processing tank for allowing the discharged processing liquid to pass therethrough and returning to the processing tank. And a filter disposed above the treatment liquid surface so as to cover the treatment liquid surface.

[Operation] Therefore, the discharge amount of the processing liquid supplied to the photosensitive lithographic printing plate can be increased or decreased by the adjusting means depending on the condition of the processing liquid in the processing tank. Further, the treatment liquid supplied to the photosensitive lithographic printing plate is once captured by the filter and dropped or flows down from the filter to the treatment liquid surface, so that foaming of the treatment liquid surface can be prevented. Further, the treatment liquid is filtered by passing through the filter, and foreign substances mixed in the treatment liquid are removed.

[Advantages of the Invention] As described above, according to the present invention, the treatment liquid supplied to the photosensitive lithographic printing plate can be prevented from foaming by the filter, and the situation of the treatment liquid dropped or flown from the lower surface of the filter and the inside of the treatment tank. The discharge amount of the processing liquid can be increased or decreased by the adjusting means depending on the condition of the processing liquid, so that the foaming of the processing liquid can be completely prevented. In this way, it becomes possible to uniformly supply the treatment liquid to the surface of the photosensitive lithographic printing plate,
At the same time, foreign substances mixed in the treatment liquid can be removed, so that there is an excellent effect that problems such as treatment unevenness can be prevented.

[Embodiment] FIG. 1 shows an embodiment of the photosensitive lithographic printing plate processor 10 according to the present invention.

The photosensitive lithographic printing plate processor 10 has a photosensitive lithographic printing plate (hereinafter referred to as PS plate) on which an image is printed by a printing device (not shown).
A developing tank 14 for developing 12; a developing solution collecting tank 16 for collecting the developing solution overflowing from the developing tank 14; and a washing tank 18 for washing the developing solution adhering to the PS plate 12 with water.
And a desensitizing tank 20 for applying the finnish solution to the PS plate 12.

As shown in FIG. 1, a pair of transport rollers 22 are arranged on the side of the PS plate 12 to be inserted into the developing tank 14. An image was printed on this transport roller 22 by a printing device (not shown).
PS version 12 is designed to be inserted.

The developing tank 14 has a substantially inverted mountain shape in which the upper part is opened and the central part of the bottom part is projected downward. A developing solution 24 is contained in the developing tank 14. In the developing tank 14, guide rollers 26, 28, 30, 32, 34, 36, 38 are provided along the bottom wall.
Are arranged. These guide rollers 26 to 38 are hung between a pair of side plates (not shown) and rotatably supported. Further, a skewer roller 40 having a guide function and a liquid discharging function is arranged between the guide rollers 34 and 36. As shown in FIG. 2, this skewered roller 40 is constructed by rotatably supporting a guide roller 41C on the outer periphery of a spray pipe 41B having a plurality of discharge ports 41A provided at predetermined intervals along the axial direction. . Therefore, the skewered roller 40 discharges the developing solution from the discharge port and guides the PS plate 12 by the guide roller. A guide roller 42 is arranged above the guide roller 26 near the transport roller 22.
Further, a guide roller 44 is provided above the guide roller 28 and the guide roller 30, and a guide roller 32 and a guide roller 34 are provided.
A guide roller 46 is disposed above the guide roller 46, a guide roller 48 is disposed above the skewer roller 40 and the guide roller 36, and a guide roller 50 is disposed above the guide roller 38. Like the guide rollers 26 to 38, they are supported by a pair of side plates (not shown).

A guide roller 34 and a skew roller 40 are provided in the center of the developing tank 14.
And a pair of conveyance rollers 52 are arranged between them. The carrying roller 52 is supported by the side plate like the guide rollers 26 to 38, and is rotated by transmitting the driving force of the driving means (not shown).

Therefore, the PS plate 12 nipped and conveyed by the conveyance roller 22 and inserted into the developing tank 14 is guided between the guide roller 44 and the guide rollers 28 and 30 by passing between the guide roller 42 and the guide roller 26. , Is obliquely lowered through the space between the guide roller 46 and the guide rollers 32, 34, and is inserted between the conveyance rollers 52,
After passing the transport roller 52, the skewer roller 40 and the guide roller 4
Guided by 8, 36, 38, it rises diagonally and guide roller 50
And is sent out above the developer recovery tank 16. In this way, the PS plate 12 is the developer in the developing tank 14.
It is soaked in 24 and developed.

A bending portion that is bent toward the outside of the developing tank 14 is formed on the side wall on the downstream side of the developing tank 14 in the conveying direction of the PS plate 12, and the vertical height of this bending portion is the conveying direction of the PS plate 12. It is lower than the upstream side wall. Therefore, the developer in the developing tank 14
Whenever 24 overflows, the developer recovery tank 16
It is supposed to be collected.

One end of a pipeline 54 communicates with the bottom of the developing tank 14. A circulation pump 56 is arranged in the middle of the pipe 54, and the other end communicates with the skewer roller 40 and the spray pipe 58 arranged in the developer 24 in the developing tank 14. As a result, the developer 24 in the developing tank 14 is circulated while being sprayed, so that more effective stirring is performed.

Further, one end of the pipeline 60 is opened at the bottom of the developer recovery tank 16, and the other end is opened above the developer tank 14 via a pump 62 in the middle. As a result, the developer collected by overflowing into the developer collecting tank 16 is returned into the developing tank 14.

In addition, a pipeline communicating with the developer replenishing tank 64 is connected to the developing tank 14.
66 is open. A replenisher pump 68 is arranged in the middle of the pipeline 66. Further, a pipeline 67 communicating with the water supply tank 65 is opened to the developing tank 14, and this pipeline 67
A water supply pump 69 is arranged midway. As a result, the developer replenisher (stock solution) in the developer replenisher tank 64 and the water in the water supply tank 65 are supplied to the developing tank 14 at a predetermined ratio.

Further, drainage pipes 55 and 61 are opened at the bottoms of the developing tank 14 and the collecting tank 16, and are communicated with a drainage tank 57. Valves 55A and 61A are provided in the middle of the drainage pipes 55 and 61. Are arranged.

The pump 62, the replenishing solution pump 68, and the circulation pump 56 are connected to a control unit 70 provided in the photosensitive lithographic printing plate processing machine 10 to control the driving.

Further, a detector 72 connected to the control unit 70 is disposed on the insertion side of the transport roller 22, and the photosensitive lithographic printing is performed by detecting the insertion state of the PS plate 12 into the photosensitive lithographic printing plate processor 10. The area of the PS plate 12 inserted into the plate processor 10 is detected.

Further, a fatigue detector 74 is arranged in the middle of the pipeline 54, and the fatigue of the developer is measured by detecting the electric conductivity of the developer. This fatigue detector
74 is also connected to the control unit 70.

As shown in FIG. 1, a pair of upper and lower conveying rollers 76 are arranged on the upper side wall of the developer collecting tank 16 and the washing tank 18 which are adjacent to each other. These transport rollers 76 are supported by a pair of side plates (not shown), and are rotated by transmitting the driving force of a driving means (not shown). Lower transport roller
A recovery roller 78 disposed in the developer recovery tank 16 is in contact with the 76. As a result, the developer 24 carried out by the PS plate 12 and attached to the transport roller 76 is collected in the developer collecting tank 16.

In the water washing tank 18, a pair of upper and lower transport rollers 82 are arranged on the downstream side in the transport direction of the PS plate 12. Like the transport roller 76, these transport rollers 82 are also supported by a pair of side plates (not shown), and are driven in the same manner as them.

Therefore, the PS plate 12 sent out from the developing tank 14 is nipped and carried by the carrying roller 76, inserted between the carrying roller pair 82 of the water washing tank 18, and sent to the desensitizing tank 20.

One end of a pipe line 88 is opened at the bottom of the washing tank 18, and the other end is in communication with skewer rollers 84 and 86 arranged between the transport roller 76 and the transport roller 82. Further, a pump 90 is arranged in the middle of the pipe line 88 so that the washing water in the washing tank 18 is supplied to the skewer rollers 84 and 86 to wash the PS plate 12. A collection roller 80 is in contact with the side surface of the lower transport roller 76 in the washing tank. This allows the lower transport roller
The washing water attached to the 76 is collected in the washing tank 18.

Further, a pipe 89 communicating with the water supply tank 65 is opened at the bottom of the washing tank 18, and a water supply pump 91 is arranged in the middle of the pipe 89.

Further, a drainage pipe 89A is opened at the bottom of the washing tank 18 and communicates with a drainage tank 89B. This drain line 89A
A valve 89C is arranged in the middle of the.

As shown in FIG. 3, a filter 200 is arranged above the flush water in the flush tank 18 so as to cover the surface of the flush water.

This filter 200 has a frame portion 2 as shown in FIG.
02 and a filter unit 204 are provided. The frame 202 has the same shape 2
Each frame member 206 is formed of four rectangular openings 208 on a rectangular stainless steel plate. The opening width of the filter is 200-400 μm.
In the embodiment of the present invention, the opening width of the filter portion 204 is 290 μm (about 50 mesh) Tetron mesh filter member cut to the same size as the above-mentioned stainless steel plate is used as the frame member 206. It is formed by sandwiching. Filters like this
The 200 has a San German structure with a frame of a filter member.

The filter 200 manufactured in this way has a skewered roller 84.
Also, the washing water discharged from the skewer roller 86 is temporarily caught regardless of whether the PS plate 12 is being conveyed, and then gradually washed.
It is designed to drop or flow down on the 18 liquid surfaces.

Therefore, even if the developer 24 attached to the PS plate 12 is brought into the washing tank 18 and the washing water in the washing tank 18 easily foams, it is discharged from the skewer rollers 84 and 86. Since the wash water does not drop directly on the water surface of the wash tank 18 and has a large impact on the wash water, it is possible to prevent the wash water from foaming.

The material of the filter portion 204 is not limited to the stainless steel plate, but any material such as PVC that does not easily bend may be used.

Further, as shown in FIG. 3, a pipe 210 is provided with a valve 210 for adjusting the amount of water discharged from the skewer rollers 84 and 86. This valve 210 is for example PS version
When washing 12 width 900mm with water, usually P
It is adjusted to be 6 l / min per side of S plate 12. However, as described above, when the developer 24 is brought into the washing tank 18 and the washing water in the washing tank 18 easily foams, it is possible to further reduce the amount of water to prevent foaming of the washing water. An orifice may be used instead of the valve 210.

As described above, in the washing tank 18, the bubbling of the washing water can be surely prevented by adjusting the water amounts of the filter 200 and the valve 210.

Since the wash water is circulated and used as described above, dust and the like may be mixed into the wash water, but they are captured by the filter 200. In this way, the filter 200 is equipped with a condition for filtering the washing water.

In the desensitizing tank 20, a pair of upper and lower conveying rollers 92 are suspended and supported between a pair of side plates (not shown). A driving force of a driving means (not shown) is transmitted to the conveying roller 92 and is rotated.

Further, on these side plates, a gum liquid discharge pipe 98 is provided above the transport path of the PS plate 12 between the transport rollers 92 and 82.
Further, skewer rollers 99 for discharging the finisher liquid are supported below the transport path and support the lower surface of the PS plate 12 and guide them to the transport rollers 92. The finisher liquid discharge pipe 98 and the finisher liquid discharge skewer roller 99 are provided with a plurality of discharge openings along the axial direction, and are supplied to the finisher liquid discharge pipe 98 and the finisher liquid discharge skewer roller 99. The fin solution is discharged. This fin liquid discharge pipe 98
And the conduit 102 for the skewer roller 99 for discharging the finisher liquid.
The circulation pump 134 is connected via the circulation pump 1
By means of 34, the finisher liquid in the desensitizing treatment tank 20 is supplied to the finisher liquid discharging pipe 98 and the finisher liquid discharging skewer roller 99.

A pipe 103 communicating with the replenisher tank 135 is opened at the bottom of the desensitizing tank 20, and a replenisher pump 135A is arranged in the middle of the pipe 103.

Further, a pipe 93 communicating with the water supply tank 65 is opened at the bottom of the desensitizing tank 20, and a water supply pump 93A is arranged in the middle of the pipe 93.

As a result, the finisher (stock solution) in the finisher replenisher tank 135 and the water in the water supply tank 65 are supplied to the desensitizing tank 20 at a constant ratio.

Next, the operation of this embodiment will be described.

PS that is nipped and conveyed by the conveyance rollers 22 into the developing tank 14.
The plate 12 is guided by the guide rollers 42 and 26 and fed.
The PS plate 12 fed into the developing tank 14 has guide rollers 44, 2
It is guided by 8, 30, 46, 32 and 34 and descends to be fed to the central portion of the developing tank 14 and inserted into the conveying roller 52. Conveyor roller
The PS plate 12 nipped and conveyed by the 52 is guided by the skewer roller 40 and the guide rollers 48, 36, 38, and 50 to move up to the developing tank 14
Sent out from within.

In this way, the PS plate 12 is immersed in the developing solution 24 in the developing tank 14 for development processing.

The developing solution 24 in the developing tank 14 is circulated to the developing tank 14 by a circulation pump 56 via a pipe 54.

The PS plate 12 sent out from inside the developing tank 14 is inserted into the carrying roller 76, and is nipped and carried. By this sandwiching, the developer 24 attached to the PS plate 12 is squeezed out by the transport roller 76 and is drained. The squeezed developer 24 travels along the surface of the lower transport roller 76 and is collected by the collecting roller 78 into the developer collecting tank 16. The developer 24 thus collected in the developer collecting tank 16 is pumped through the conduit 60 as described above.
By 62, it is returned to the inside of the developing tank 14.

The PS plate 12 transported into the washing tank 18 by the transport rollers 76 is guided by the skewer rollers 84 and 86, inserted into the transport rollers 82, and sandwiched. At this time, the wash water from the skewer rollers 84, 86
It is discharged onto the PS plate 12. As a result, the developer 24 attached to the surface of the PS plate 12 is removed. The rinse water after the rinse is collected into the rinse tank 18 through the filter 200 and the amount of the rinse water can be adjusted by the valve 210 as necessary, so that the bubbling of the rinse water in the rinse tank 18 can be prevented. The washing water in the washing tank 18 is supplied to the skewered rollers 84, 86 by a pump 90 via a pipe line 88.

The PS plate 12 sent out from the carrying roller 82 is guided by the skewer roller 99 for discharging the finisher liquid and is inserted between the carrying rollers 92. During this transportation, the finisher liquid discharged from the finisher liquid discharge pipe 98 and the finisher liquid discharge skewer roller 99 is applied to the surface of the PS plate 12.
Excess finnish solution is collected in the desensitizing tank 20.

The PS plate 12 sent from the carrying roller 92 is sent to a drying device (not shown).

In this way, the PS plate 12 is developed in the developing tank 14 and washed with water 18.
The washing treatment is carried out with the desensitization treatment tank 20 and the finishing treatment is carried out in the desensitizing treatment tank 20.

Further, the fatigue caused by the processing of the developer 24 varies depending on the area of the image area and the area of the non-image area of the PS plate 12 (the larger the area of the image area, the greater the fatigue of the developer). The electric conductivity of the developer 24 is detected by. Based on this result, the control unit 70 controls the replenisher pump 68 and the water supply pump.
The operation time of 69 is calculated, and a replenisher pump 68 is provided to supply a replenishment amount of the developer replenisher (stock solution) corresponding to the developer fatigue level from the replenisher tank 64 and water from the water supply tank 65 at a constant rate. The water supply pump 69 is activated. However, the PS plate melt-dissolved deposits to the fatigue detector 74, deposits of developer components, etc., may cause an abnormality in the detected value of electrical conductivity by the fatigue detector 74, If the difference between the insertion area of the PS plate 12 detected by the detection sensor 72 and the value of the fatigue level of the developer due to electrical conductivity shows an abnormal value, an alarm is generated, or as described below. , The PS plate 12 can be automatically or manually switched to a replenishment method based on the insertion area.

That is, the detection sensor 72 detects the area of the PS plate 12 to be inserted, and the control unit 70 calculates the operating time of the replenisher pump 68 and the water supply pump 69 based on the detection result.
The replenishing liquid pump 68 and the water supply pump 69 are operated to supply the replenishing liquid of the developing amount according to the area of the above.

On the other hand, the wash tank 18 is replenished with wash water by the water supply pump 91, and the desensitization tank 20 is replenished with the finisher (stock solution) and the water supply pump 93A by the replenisher pump 135A so that the water has a predetermined mixing ratio. It is supposed to be done.

Each processing liquid and water are controlled by the replenishment amount according to the area of PS plate 12
It is controlled and replenished at 70.

In the above embodiment, the filter and the valve for adjusting the flow rate are applied to the washing tank, but the present invention is not limited to this, and may be applied to other processing tanks such as a desensitizing processing tank. Of course, it can be applied.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram showing a photosensitive lithographic printing plate automatic processing machine to which the present invention is applied, FIG. 2 is a perspective view of a skewer roller, and FIG. 3 is a cross section showing the arrangement of filters in a washing tank. 4 and 5 are perspective views of the filter. 10 …… Photosensitive lithographic printing plate processor, 76, 82 …… Conveying rollers, 84, 86 …… Skew roller, 200 …… Filter, 202 ……
Frame part, 204 ... filter part, 210 ... valve, 220 ... coil spring, 224 ... protrusion, 234 ... O-ring, 236
…… E-ring.

Claims (1)

[Scope of utility model registration request] 1. A photosensitive lithographic printing plate processor for developing a photosensitive lithographic printing plate having an image printed thereon with a developing solution in a developing tank, and processing the developed photosensitive lithographic printing plate with the processing solution in a processing tank. Used in a foaming prevention structure of a photosensitive lithographic printing plate processor for preventing foaming of the processing liquid, the processing liquid in the processing tank is circulated and discharged above the surface of the processing liquid in the processing tank. Adjusting means for adjusting the discharge amount of the processing liquid supply means to be supplied to the photosensitive lithographic printing plate surface, and the processing liquid above the processing liquid surface in the processing tank so that the discharged processing liquid is passed and returned to the processing tank. A bubble prevention structure for a photosensitive lithographic printing plate processing machine, comprising: a filter arranged so as to cover the surface.