JPH0428099Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to uniform stabilization of processing liquid coating performance and improvement of cleanability of a processing liquid coating type printing plate developing device.

[Conventional technology]

As shown in FIG. 5, a developing device for printing plates, especially PS plates, using photosensitive materials has various functions housed in a frame 1 and is installed on the floor via jack bolts 13. Then, a printing plate 101 such as a PS plate is supplied from the insertion table 102, and conveyance rollers 2A, 2
The printing plate is conveyed while being held by guide rollers 2C, and a developer is applied to the surface of the printing plate by a shower pipe 3, and further by a brush roller 5, the photosensitive layer on the wet surface is swelled, dissolved, and peeled off easily. After development, the printing plate is transported to the next washing step, where it is washed with water from a shower pipe, and in the next rinsing section, a rubbery gum solution or rinsing liquid is applied to the surface of the printing plate to protect the surface. It is designed to be collected after the development process is completed.

The developer in the developer tank 9 is circulated and temperature-controlled by the pump P through the heat exchanger 9A, and is repeatedly circulated and used while being discharged from the shower pipe 3 by the pump 8A.

Similarly, the water in the washing tank 10 and the rinsing liquid in the rinsing tank 11 are also circulated and used while being discharged from the shower pipes 3A and 3C by pumps 8B and 8C, respectively. However, the temperature is not controlled like a developer.

During this period, although not shown, the new liquid is also periodically replaced with the old liquid.

[Problem that the invention attempts to solve]

In such a printing plate developing device, the developer is easily oxidized, and even if it is recycled and refilled with new solution, the developer deteriorates significantly and it is difficult to obtain stable development quality. There was a drawback that the equipment was contaminated by scattering.

In order to solve these drawbacks, it is an object of the present invention to provide a developing device that can evenly and uniformly apply a small amount of developer to the surface of a printing plate.

[Means for solving problems]

The purpose of this is to construct a developing device for a printing plate using a conveyor roller, a processing liquid tank, a processing liquid supply pump, and a brush roller, and to arrange a nozzle hole on a pipe for supplying a small amount of developer onto the printing plate. A slit is formed between two sheet-like thin plates sandwiching the pipe to guide the effluent onto the printing plate, and the thin plates are held almost uniformly between members provided in parallel on both sides of the pipe. This is achieved by a processing liquid coating type printing plate developing device characterized by the following characteristics.

〔Example〕

Embodiments of the present invention will be described with reference to FIGS. 1, 2, 3, 3-A, 4, 6, and 7.

In the figures, members having the same functions as those of the conventional example are indicated with the same numbers.

Furthermore, the present invention is not limited to this embodiment.

As shown in FIG. 1, the developing device for printing plates, particularly PS plates, using the photosensitive material of the present invention has its various functions housed in a frame 1 and is installed on the floor via jack bolts 13. Horizontal adjustment is then performed by the adjustment nut 13A.

Then, a printing plate 101 such as a PS plate is inserted into the insertion table 10.
2 through the preheat roller section 130, and is held between the conveyance rollers 2A and 2B, and then the guide roller 2.
It is conveyed while being held by C. Then, at the base slit nozzle section 20, the fresh developer is poured out in small quantities as necessary and uniformly applied onto the photosensitive layer surface of the printing plate supplied onto the guide roller 2C. Next, in a shallow-bottomed dip developing tank 50, the printing plate being conveyed is guided by rollers 15 and subjected to immersion development, and a brush roller 5 facilitates swelling, dissolution, and peeling of the photosensitive layer on the wet surface. While promoting the development, the product is conveyed to the next step, a washing step, and is washed with water from the shower pipes 3A and 3C, and then proceeds to the next gum step or rinse application step.
The surface of the printing plate is coated with a gum solution or a rinsing solution to protect it from damage such as scratches. Although not shown in the drawings, after the development process is completed through a drying process, the film is collected.

Here, the shallow-bottomed deep developing tank has a large liquid surface area, and since the printing plate 101 guided by the roller 15 is conveyed and stirred in the liquid, the liquid is easily evaporated. Therefore, a lid 40 is provided as means for preventing evaporation. Incidentally, the dip development using the shallow bottom type dip development tank is provided in order to eliminate the undeveloped portion called the edge effect on the collecting side of the printing plate due to coating development. This undeveloped area is undesirable because it causes staining during the printing process.
However, the freshness of the developer here is not required so much.

Next, the supply pump 110 for supplying the developer to the mixing section 60 and the base slit nozzle section will be explained.

The developer liquid is put into a cartridge tank 61, which is placed upside down on a movable stand 64 that slides along a fixed stand 65, and a hose is connected from the plug part 62 of the tank to the injection part of the auxiliary tank 68. connected with. The upper part of the auxiliary tank 68 forms a tapered section 67 and is open to the atmosphere. However, since the contact area with the atmosphere is small, the stock solution is less likely to be oxidized. The lower part of the auxiliary tank 68 forms a wide portion 68A, and is lower than the lowest part of the cartridge tank 61. As a result, the auxiliary tank 68
If a part of the cartridge tank is made transparent, it will be possible to know the liquid level inside the cartridge tank, and if a float switch SWO is installed as a liquid level detector in the auxiliary tank near the bottom of the cartridge tank. It is detected that the developing solution in the cartridge tank is being used until it is empty, and even then, there is still some developing solution in the auxiliary tank, so it is possible to replace the cartridge tank with a new solution without stopping the operation of the entire device. can. Here, the cartridge tank 61 is convenient because it can be used as a commercially available Kyuubitainer packed with undiluted solution almost as is. A hose is connected from the outlet of the auxiliary tank 68 to the inlet of the pump 69A, and a hose is connected from the outlet of the pump to the mixing tank 81.

On the other hand, the dilution water tank 71 is connected to the inlet of the pump 69B, and the discharge port of the pump is piped to the mixing tank. Normally, the discharge amount of each pump is adjusted so that 5 parts of dilution water are used for 1 part of the undiluted developer solution. However, the degree of dilution is not limited to this, and can be adjusted in various ways.

In this way, both liquids in the mixing tank are sufficiently mixed by the stirrer 82, and both liquids are mixed while being poured until the float switch SW1 detects the liquid.
Then, after stopping and waiting, when the level detection float switch SW3 in the temporary developer storage tank detects that the remaining amount of developer is low, the valve opening/closing solenoid is activated, and the solenoid valve 83 at the bottom opens and the developer is removed. It is fed from a portion 87 near the bottom of the temporary storage tank 85. During this time, mix tank 8 of developing stock solution and water.
The sending to 1 is canceled. When the mixed developer flows into the temporary developer storage tank and the float switch SW2 detects the liquid level, the solenoid valve 83
is operated, the valve is closed, and the developer stock solution and water are again injected into the mixing tank, and the agitator 82 is driven. The mixing and dilution of the developer of the next lot is completed before the developer of the previous lot is consumed. Therefore, the supply of developer from the temporary developer storage tank 85 is not interrupted during printing plate development.

The developer in the temporary developer storage tank 85 is connected from the outlet at the bottom of the tank to the inflow side of the supply pump 110 via piping. The pump 110 uses three bellows pumps 111, 112, and 113, which are designed to repeat suction and discharge with a phase shift of 120 degrees from each other, thereby eliminating pulsation on the discharge side and uniformly applying the developer. It's becoming like that. The developing solution discharged from the pump 110 is transferred to a temperature controller 115.
As the developer passes through the base slit nozzle section 20, the developer is kept at a constant temperature and is applied to the printing plate.

Now, the water in the washing tank 10 and the rinsing liquid in the rinsing tank 11 are circulated and used while being discharged from the shower pipes 3A and 3C by pumps 8B and 8C, respectively. During this time, although not shown, the new liquid and the old liquid are exchanged periodically.

By the way, the developing device of the present invention is equipped with a base slit nozzle, so that new solution is always supplied in the amount necessary for coating and development without recycling the developer, and a very small amount of surplus developer is sent to a separate collection bucket. We have a small-volume development system that collects and disposes of liquid as waste.

Therefore, genuine development using a small amount of fresh developer is always carried out efficiently. We have proposed a method that stabilizes the uniform application of small amounts and makes assembly, disassembly and cleaning easy.
An example thereof will be described.

In other words, in order to uniformly apply the developer to the surface of the photosensitive material of the printing plate, two sheets of polyester base, which is used as a base for photographic photosensitive materials, are stacked together to form the slit nozzle, and the amount of liquid is measured from the seam at the tip. was used to form a uniform coating film on the printing plate, allowing for run-off coating.

For this purpose, as shown in FIGS. 6 and 7, holes are made at intervals in the polyester bases 28 and 29, and the bases are sandwiched between the presser plate 37 and the retainer plate 24 or 25 and tightened with screws 38. Since it seemed like a simple means of fixing it, I prototyped it and tested it during the process of developing this invention. However, on the basis of the first half,
Deformation during the drilling process remained, and the slit portion 39 formed at the tip of the base tended to undulate due to distortion caused by tightening with uneven pressure, which was found to be an obstacle to uniform application. .

Therefore, a square pipe 2 with a plurality of discharge ports 22 as shown in the side view of FIG. 2 and the front view of FIG.
Holding plates 24 and 25 having planes parallel to the central axis of the pipe are fixedly provided on both sides of the pipe, and an auxiliary holding plate 26 having a plane parallel to the central axis is provided on each of the holding plates. A slightly hard buffer plate 24A, 2 made of plastic or the like is installed inside the plate and the auxiliary holding plate.
5A, 26A, and 26B are fixed, and the buffer plate is narrow at the bottom and widened at the top of the fixed surface of the buffer plate.

And the holding bar 27 is the polyester base material 2
The bases 28 and 29 are surely sandwiched and fixed with uniform force by being fitted through the bases 8 and 29 and lowered by their own weight, and the slit portions formed at the tips of the bases 28 and 29 are also wave-shaped. It becomes a uniform slit shape without getting depressed. Therefore, if the developer is fed to the square pipe in this state, the required amount of developer will flow from the plurality of discharge ports 22 to the polyester base 28, 29.
The photosensitive layer surface of the printing plate 101 is uniformly coated from the tip thereof.

This realizes stable small-volume liquid development. The polyester base material can then be easily removed by lifting the holding bar 27 upward.
This facilitates cleaning of the base.

The holding bar 27 may be a round bar as described above, but a square bar as shown in FIG. 3-A is also proposed. That is, it is a square rod 27A whose opposing surfaces are a plane parallel to the cushioning material 24A or 25A and a plane parallel to the cushioning material 26A or 26B, and it has a good retention effect on the polyester base material like a round rod. By shifting the square bar toward the top, the base can be easily attached and detached.

Another embodiment of the means for fixing the polyester bases 28, 29 is shown in FIG. A pressing member 35 is provided on the contact surface of the polyester bases 28, 29 of the holding plates 24, 25 fixed to the square pipe 21, which can be pressed by the suction force of a magnet and can be opened and closed by a hinge 36. A rubber magnet material 35A is fixed to the member 35.

As a result, the polyester base 28,2
9 is removable and is pressed evenly when attached to form a uniform slit nozzle.

In the above description of this embodiment, the developer supply pipe is
Although I used a square pipe, a cylindrical pipe can of course also be used.

[Effect of idea]

With this invention, printing plates such as PS plates can be stably developed with a small amount of fresh developer, and high quality, high consumption efficiency and low cost printing plate development can be realized without developer deterioration. Ta.

[Brief explanation of the drawing]

Figure 1 is an overall configuration diagram of the present invention. Figure 2 is a side view of the base slit nozzle used in the present invention. FIG. 3 is a front view of the portion shown in FIG. 2. FIG. 3-A is a side view of another embodiment of the base slit nozzle part used in the present invention. FIG. 4 is a side view of another embodiment of the base slit nozzle used in the present invention. FIG. 5 is an overall configuration diagram of a conventional developing device. Figure 6 is a side view of a base slit nozzle part that was prototyped during the development of the present invention. FIG. 7 is a front view of the portion shown in FIG. 6. 20...Base slit nozzle portion, 21...Developer solution supply square pipe, 22...Standard image solution discharge port, 2
4, 25... Holding plate, 24A, 25A... Buffer plate, 26... Auxiliary holding plate, 26A... Buffer plate, 2
7... Holding bar, 27A... Square bar, 28, 29...
...Polyester base material, 50...Shallow bottom type developer tank section, 60...Developer mixing section, 110...
supply pump.

Claims (1)

[Claims for Utility Model Registration] 1. A developing device for a printing plate is composed of a conveyance roller, a processing liquid tank, a processing liquid supply pump, and a brush roller, and a nozzle hole through which a small amount of developer is discharged and supplied onto the printing plate is connected to a pipe. A slit is formed by two sheet-like thin plates disposed above the pipe to guide the effluent onto the printing plate, and the thin plates are arranged substantially uniformly on members provided parallel to both sides of the pipe. 1. A processing liquid coating type printing plate developing device, characterized in that the device is held between two plates. 2. The member fixes two guiding flat plates parallel to both sides via a frame attached to the pipe so that the upper part is wide and the lower part is narrow, and a holding bar is inserted between the guiding flat plates, and the upper and lower parts are fixed. so that the sheet-like thin plate can slide,
A processing liquid coating type printing plate developing device according to claim 1, characterized in that the device is held between the bar and the flat guide plate. 3. The processing liquid coating type printing plate developing device according to claim 2, wherein the holding bar is a round bar. 4. The processing liquid coating type printing plate developing device according to claim 2, wherein the holding bar is a square bar having a surface parallel to each of the guide flat plates. 5. The member can be opened and closed on a plane parallel to the pipe of the frame attached to the pipe via a hinge formed on the upper part of the plane, and the sheet can be pressed tightly against the sheet by a pressing plate. A processing liquid coating type printing plate developing device according to claim 1, characterized in that a shaped thin plate is held in a sandwiched manner. 6. The processing liquid coating type printing plate developing device according to claim 5, wherein a rubber-like magnet material is attached to the pressing plate in parallel to the plate.