JPH0887116A - Processing device for photosensitive planographic printing plate - Google Patents

Abstract

PURPOSE: To provide a processing device for a photosensitive planographic printing plate in which production of contamination is decreased in a water washing process in the processes of processing a photosensitive planographic printing plate, the amt. of waste washing water can be decreased, the maintainability is improved, and the cost for the processing device is decreased. CONSTITUTION: The processing device for a photosensitive planographic printing plate is equipped with at least a water washing device C for washing with water in a washing tank 20 in the poststage of a developing device B. In the washing tank 20, activated carbon is fixed with an alkali-resistant membrane 23, or the processing device for photosensitive planographic printing plate is equipped with at least a water washing device C for washing with water in a washing tank 20 in the poststage of a developing device. In this processing device, activated carbon is fixed to the water washing tank with an alkali- resistant film 23 and a fixing member.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a photosensitive lithographic printing plate processing apparatus, and more particularly to a rinsing apparatus for a processing apparatus having a rinsing apparatus after a developing apparatus.

[0002]

2. Description of the Related Art Conventionally, the processing of a photosensitive lithographic printing plate by an automatic developing machine is generally a developing process in which a developing solution is supplied to the photosensitive layer while the photosensitive lithographic printing plate is conveyed to elute the photosensitive layer imagewise. Then, a water washing treatment is performed in which the developer containing the eluate adhering to the plate surface is washed with water and washed away. Then, as a form of use of rinsing water in the rinsing treatment, water in the rinsing tank is sprayed from the shower nozzle onto the surface of the photosensitive lithographic printing plate to wash, and the water used for rinsing is returned to the rinsing tank and circulated. There are known a method of reusing, a method of disposing of washing water, and a method of replenishing the washing water to be reused with water in accordance with the carry-in from the developing step.

However, these methods have problems that the amount of washing waste liquid is large and the waste liquid recovery cost is high, and that the environment is polluted by discharge to the sewer. There was a problem that stains and sludge accumulated on the washing tank, the piping for circulating the washing water, the shower nozzle, etc., and the sludge adheres to the printing plate to cause printing stains unless the washing water is changed frequently. .

In order to solve such a problem, there has been proposed a treatment method in which the waste liquid of the washing water discharged in the washing step is regenerated and the obtained regenerated water is returned to the washing step and reused. Wishhei 3-90239, 3-129391, 3-133329
issue). However, the above method requires a waste liquid treatment device in addition to chemicals such as a neutralizing agent and a coagulant, so that there is a problem in maintenance and cost of the device.

In order to reduce the cost of the waste water treatment device for washing water, it has been attempted to provide a filtering device such as a filter in the circulation system of the washing water. However, this method cannot sufficiently filter the printing plate. There was a phenomenon in which sludge adhered to the surface and caused printing stains. Further, since the dirt is generated in a relatively short period of time, it is necessary to frequently replace the washing water.

[0006]

SUMMARY OF THE INVENTION The present invention is intended to solve the above problems in the prior art,
The object of the present invention is to reduce the generation of stains in the washing step of the photosensitive lithographic printing plate treatment step, reduce the amount of waste water of the washing water, improve the maintainability, and reduce the cost of the processing apparatus. An object of the present invention is to provide a processing device for a photosensitive lithographic printing plate.

[0007]

The above-mentioned object is a photosensitive lithographic printing plate processing apparatus having a rinsing device for rinsing with rinsing water in at least a rinsing tank after a developing device, wherein activated carbon is contained in the rinsing tank. A photosensitive lithographic printing plate processing device characterized by being fixed with an alkali-resistant film, or a photosensitive lithographic printing plate processing device having a rinsing device for rinsing with at least rinsing water in a rinsing tank after a developing device And a activated lithographic printing plate treating apparatus characterized in that activated carbon is fixed to the water washing tank by an alkali resistant film and a fixing member.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings. FIG. 1 shows a schematic configuration of an embodiment of a processing apparatus of the present invention. The processing apparatus comprises an insertion portion A for inserting a photosensitive lithographic printing plate, a developing portion B for developing, and a water washing for washing. Part C, finisher part D for treating with a rinsing solution or gum solution, drying part E for drying, and detection of insertion of a photosensitive lithographic printing plate into an automatic developing machine, and detection of the inserted photosensitive lithographic printing plate. It is mainly composed of a sensor for detecting an area and a control mechanism (not shown). PS is a conveyance path for the photosensitive lithographic printing plate.

The insertion section A includes an insertion table 1 for guiding the insertion of the photosensitive lithographic printing plate, an optical sensor 2 for detecting the photosensitive lithographic printing plate by reflected light, and a nip conveyance for nipping and conveying the photosensitive lithographic printing plate. The roller 3 is provided.

In the developing section B, the photosensitive lithographic printing plate is curvedly conveyed in the developing solution in the developing tank 5 by the nip conveying roller 3 and the conveying roller 4, and in the developing tank 5. Processing liquid discharge nozzle 6 for spraying the developing liquid onto the photosensitive layer surface of the photosensitive lithographic printing plate during immersion development, magnet pump 7 for sending the developing liquid to the processing liquid discharge nozzle 6, and rubbing the surface of the photosensitive lithographic printing plate for development. A brush roller 8 for accelerating, a plate pressing roller 9 for supporting the photosensitive lithographic printing plate, a heater 10 for maintaining the temperature of the developing solution within a predetermined temperature range, a concentrated developing replenisher tank 14 containing a concentrated developing replenisher, and a concentrating tank. Bellows pump 12 for sending development replenisher to developing tank 5, dilution water tank 15 for containing diluting water, bellows pump 13 for sending diluting water to developing tank 5, and bellows for returning developing solution overflowing from developing tank 5 to developing tank 5. Pump 11, developer waste tank 17,
It is mainly composed of a lid 18 for covering the surface of the developing solution to reduce the contact area of the developing solution with the air, and a replenishing circuit (not shown) for replenishing in accordance with the processing of the photosensitive lithographic printing plate.

The washing section C has a structure in which the washing water is circulated and reused. The washing tank 20 contains the washing water and the magnet pump.
21, a processing liquid discharge nozzle 6, a nip conveying roller 3, and an alkali resistant film 23 for fixing the activated carbon 22.

The finisher section D includes a finisher liquid tank 30 containing a rinse liquid or a gum liquid, a magnet pump 31, a processing liquid discharge nozzle 6, a nip conveying roller 3, a concentrated finisher replenishing liquid tank 16, and a concentrated finisher replenishing liquid tank. Bellows pump 33 to send to 30, dilution water tank 1
5, Bellows pump that sends dilution water to the finisher liquid tank 30
2. It is mainly composed of a replenishing circuit (not shown) that replenishes according to the processing of the photosensitive lithographic printing plate. In the figure, * 1 and * 1, and * 2 and * 2 are connected by piping. In the drying section E, 40 is a dry air discharge nozzle and 3 is a nip conveying roller.

A large number of optical sensors 2 provided at the insertion portion A of the processing apparatus are arranged at equal intervals in the width direction of the processing apparatus, and these optical sensors are reflected by the surface of the photosensitive lithographic printing plate. The bellows pumps 12, 13, 32, 33 are adapted to detect light, integrate the detected signal by a replenishing circuit (not shown) to obtain an integrated signal, and replenish a required replenishing amount proportional to the integrated area. Is configured to control the operation of the. The replenishing circuit has a function of replenishing a fixed amount of replenishing liquid per unit time regardless of the treatment of the photosensitive lithographic printing plate.

FIG. 2 is a perspective view of the alkali resistant film 23 in FIG. As shown in the figure, the alkali resistant film 23 is formed in the shape of a rectangular parallelepiped box, and the inside thereof can be filled with activated carbon. The alkali-resistant film is provided with a large number of pores (not shown) of a size that allows washing water to pass therethrough without passing activated carbon particles. The box-shaped alkali resistant film 23 is filled with activated carbon inside and is supported and fixed by the inner wall of the washing tank 20 as shown in FIG. Note that, in FIG. 3, the conveying roller, the shower nozzle, and the like are not shown. In the washing tank 20 to which the alkali-resistant film 23 is fixed, the washing water flows through the pores of the alkali-resistant film 23, so that the adsorbed component to the activated carbon contained in the washing water is adsorbed by the activated carbon.
The pores may be provided on a part of the surface of the alkali resistant film 23. A cover may be provided on the alkali-resistant film 23 for the purpose of preventing the dissipation of activated carbon, and the alkali-resistant film 23 may be washed with a water tank 20.
When fixing it to the inside of the washing tank 20,
A guide member or a fixing member for guiding the insertion of or fixing the position may be provided. In the present invention, as means for fixing the activated carbon to the washing tank with the alkali resistant membrane, as described above, the alkali resistant membrane is formed into a box-shaped container, and the activated carbon is put into the box-shaped container to fix the container to the washing tank. It is not limited to the mode, and any means can be adopted.

FIG. 4 is a perspective view showing a state in which the activated carbon is fixed to the water washing tank as shown in FIG. 1 by an alkali resistant film and a fixing member, and the conveying roller, the shower nozzle and the like of the water washing tank are omitted. There is. In the figure, reference numeral 50 denotes a fixing member, which is composed of a U-shaped frame 51 and two side plates 52 and 53 in a box shape, and is provided inside a box-shaped body formed by the frame 51 and the side plates 52 and 53. A box-shaped alkali resistant film as shown in FIG. 2 is inserted and gripped. Both ends 51 of the frame 51
a has a shape such that the upper side plate of the washing tank can be bite or inserted into the upper side plate to hang the fixing member 50, and both end portions 51a are fitted into the upper ends of the side plates of the washing tank 20 to fix the fixing member 50 to the washing tank 20. It is supposed to be fixed. The side plates 52 and 53 have a structure that allows liquid to pass through, and are formed of, for example, a mesh. A box-shaped alkali-resistant film as shown in FIG. 2 is inserted into the fixing member 50. After the alkali-resistant film is filled with activated carbon, it is inserted into the washing tank 20 and fixed.

In the present invention, the means for fixing the activated carbon with the alkali resistant membrane and the fixing member is not limited to such means, and the activated carbon is put in, for example, a bag-shaped alkali resistant membrane, and a plurality of fixing members 50 are fixed. You may do it. The fixing member is not limited to the above embodiment and may have any structure as long as it can fix the alkali resistant film and can pass the wash water through the activated carbon retained by the alkaline film.

In the present invention, the alkali resistant film is preferably a film formed of aromatic polyamide, polyolefin, polysulfone, polyimide, fluororesin, polypropylene, crosslinked aramid, perfluorinated polymer, polyethersulfone, or the like. Can be mentioned. More preferably, it is a film of polysulfone, polyimide, polyether sulfone, polyamide or the like. Further, a composite film can be used, and one kind of film or two or more kinds of films may be used.

The pore size of the pores provided in the alkali-resistant membrane for allowing water to pass therethrough without allowing activated carbon to pass may be selected so that the particles of the activated carbon used do not pass, usually 10 ³ to 10 ^-8 μm, particularly 10 ³ A range of up to 10 ^-5 μm is preferred. Activated carbon can be used in various shapes such as molding, crushing, granules, powder, and fibrous shape, and preferably has an average particle diameter of 10 to 100 μm. The activated carbon may be a mixture of different shapes. The amount of activated carbon fixed by the alkali resistant film is preferably in the range of 0.1 to 1.0, particularly preferably 0.3 to 0.9 in the ratio of (volume of alkali resistant film) / (volume of activated carbon).

Alkali-resistant membranes having such pores are commercially available, for example, NBC Kogyo Co., Ltd.
Manufactured by Nishikawa Filter Industry Co., Ltd., Nakao Filter Co., Ltd., Japan Filter Industry Co., Ltd., Nitto Denko Corporation, Asahi Kasei Co., Ltd., Kuraray Co., Ltd., Kureha Chemical Co., Ltd., Teijin Ltd., Azumi It is preferable to use products such as Filter Paper Co., Ltd., Kanebuchi Chemical Co., Ltd., Kyowa Filter, etc. One example of the products is NBC Kogyo's product name PE.
-120 eyes, PP-150 eyes, TXT-10 eyes, AF-70, PPS etc. can be used.

In the present invention, in order to fix the activated carbon to the washing tank, in addition to the means for placing the activated carbon in the container having the alkali resistant membrane having pores as described above and installing it in the washing tank, the alkali resistant treatment is performed. It is preferable to accommodate and fix a stainless steel basket or container, a container formed by molding an alkali resistant resin, or the like containing activated carbon in a container having an alkali resistant film. The size and shape of these containers and the like are not limited as long as they do not hinder the washing process.

The photosensitive lithographic printing plate to which the processing apparatus of the present invention is applied and the processing thereof include the following:
A photosensitive material having a negative type photosensitive layer using a diazo compound as a photosensitive substance, and a photosensitive material having a positive type photosensitive layer using an o-quinonediazide compound. More specifically, for example,
JP 62-175757, 62-24264, 62-25761, 6
2-35351, 62-73271, 62-75535, 62-89060
No. 62, No. 62-125357, No. 62-133460, No. 62-159148,
62-168160, 62-175758, 62-238565, 63-
188141, 63-200154, 63-205658, JP 1-15
Photosensitive lithographic printing plates as described in JP-A-9654, JP-A-2-236552 and JP-A-2-189547 and treatments thereof.

Next, an experimental example of a processing method using the processing apparatus of the present invention will be shown.

Experimental Example 1 The alkali-resistant film 23 of the treatment apparatus shown in FIG. 1 was made of a polyether sulfone resin having the structure shown in FIG.
Granular activated carbon CAL on 20 μm alkali resistant film (container shape)
Fixing member 50 filled with (made by Toyo Calgon Co., Ltd.) and shown in FIG.
24 liters of the following developer composition 1 was placed in the developing tank 5 using the processing device in which the fixing member 50 loaded in (stainless steel) was replaced.
Preparation, the liquid temperature was adjusted to 30 ° C., and the transport speed of the photosensitive lithographic printing plate was adjusted so that the development time was 12 seconds. The replenishment amount of the processing solution is 21 ml each time the replenishing amount of the following replenishing solution composition A is 5 m ^{2 of the} photosensitive lithographic printing plate, 110 ml each time the operating time of the processing device reaches 1 hour, and the stop time of the processing device is 1 hour. The amount of replenisher of gum solution is 30 ml every 5 m ^{2 of the} photosensitive lithographic printing plate, 17 ml every time the operation of the processing device reaches 1 hour, the stop time of the processing device It was adjusted to 17 ml per hour. Positive photosensitive lithographic printing plate KM (Konica Corporation)
Of 1003 mm × 800 mm, manufactured by Mitsui Chemical Co., Ltd.) was treated with 30 m ² per liter of developer. During this treatment, the wash water after the treatment of 0 m ² , 10 m ² , 20 m ² and 30 m ² was taken out, and the stain resistance and reduction of the amount of waste water of the wash water were evaluated by the following evaluation methods.

Developer composition 1 A potassium silicate 120 parts by weight potassium hydroxide (50% aqueous solution) 13 parts by weight water 620 parts by weight Developer replenisher composition A A potassium silicate 70 parts by weight potassium hydroxide (50% aqueous solution) 30 350 parts by weight Water 350 parts by weight Evaluation of stain resistance A film original was brought into close contact with the photosensitive lithographic printing plate KM and exposed for 60 seconds from a distance of 90 cm with a 2 kW metal halide lamp. This sample was applied to the photosensitive lithographic printing plate at 0 m ² , 10
The lithographic printing plate obtained by treating m ² , 20 m ² and 30 m ² respectively was coated with a printing machine (Heidel GTO) and printing ink (Hiplus M manufactured by Toyo Ink Mfg. Co., Ltd.).
Red) and fountain solution (SEU-3: 2.5% manufactured by Konica Co., Ltd.) were used, and the non-image area when 10,000 sheets were printed was visually evaluated according to the following evaluation criteria.

◯: The non-image area is not dirty.

X: Ink is adhered to the non-image area, causing defective printing.

Evaluation of Reduction of Amount of Waste Water of Washing Water The life of the wash water was evaluated as reduction of the amount of waste water of the washing water. While the photosensitive lithographic printing plate was being treated for 30 m ² , the washing water failure was evaluated due to clogging of the shower nozzle for discharging the treatment liquid, generation of bubbles in the washing water, and the like.

Experimental Example 2 Activated carbon was granular activated carbon FILTRASORB 300 (Toyo Calgon Co., Ltd.)
The same experiment as in Experimental Example 1 was carried out except that it was replaced with (made by).

Experimental Example 3 Without using the fixing member 50, the alkali resistant film 23 was directly washed in the water washing tank 20.
The same experiment as in Experimental Example 1 was carried out except that it was fixed as shown in FIG.

COMPARATIVE EXPERIMENTAL EXAMPLE 1 The same experiment as in Experimental Example 1 was carried out using a treatment apparatus in which a 200-mesh pole filter was provided after the magnet pump 21 except for the alkali-resistant film 23 in FIG.

Comparative Experimental Example 2 An experiment similar to Experimental Example 1 was conducted using the processing apparatus except for the alkali resistant film 23 in FIG.

The above results are shown in Table 1 below.

[0033]

[Table 1]

From the results shown in Table 1, according to the present invention, in the washing process following the developing process in the process of the photosensitive lithographic printing plate, the generation of stains on the washing water is improved and the amount of waste water of the washing water is reduced. I know that I can do it.

[0035]

According to the present invention, in the washing step of the photosensitive lithographic printing plate treating step, the generation of stains is reduced, the amount of waste water of the washing water is reduced, and the maintainability is improved.
Further, there is provided a photosensitive lithographic printing plate processing apparatus in which the cost of the processing apparatus is reduced.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram showing an example of a processing apparatus of the present invention.

FIG. 2 is a perspective view of an alkali resistant film 23 in FIG.

3 is a perspective view showing a state in which an alkali resistant film 23 in FIG. 1 is fixed to a washing tank 20. FIG.

FIG. 4 is a perspective view showing a state where activated carbon is fixed to a washing tank with an alkali resistant film and a fixing member.

[Explanation of symbols]

 20 Rinsing tank 23 Alkali resistant film 50 Fixing member A Insertion part B Development part C Rinsing part D Finisher part

Claims (2)

[Claims] 1. A processing apparatus for a photosensitive lithographic printing plate, which comprises a developing device and at least a rinsing device for rinsing with rinsing water in a rinsing tank, in which activated carbon is fixed by an alkali-resistant film. A photosensitive lithographic printing plate processing apparatus characterized by the above. 2. A processing device for a photosensitive lithographic printing plate, comprising a washing device for washing at least with washing water in a washing tank after a developing device, wherein activated carbon is fixed to the washing tank with an alkali resistant film and a fixing member. And a photosensitive lithographic printing plate processing apparatus.