JPS63282740A - Method for developing photosensitive material for printing - Google Patents

Abstract

PURPOSE:To enable stable and uniform development by using a relatively small volume of a developing soln. by forming a developing soln. pool by a dike plate to a developing roller on an incoming side of a photosensitive paper for printing. CONSTITUTION:Surface roughened rollers having a prescribed shape are used for the developing rollers 2, 3 for the photosensitive material for printing (PS plate) and the dike plate 6 for forming the developing soln. pool is provided on the roller 2. The fresh developing soln. is supplied by a liquid feed pump P to a nozzle 5 and the developing soln. pool is formed at the time of development. The development by the fresh soln. is then carried out between the rollers 2 and 3. The removal of unequal development is executed by the used developing soln. fed to a nozzle 8 between the developing rollers 3 and 4. The developing rollers are thus sufficiently wet with the developing soln. and the developing soln. filled in the surface roughened rollers is transferred to the PS plate. The stable development with the small volume of the developing soln. is thereby executed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for making a printing plate, and particularly to its development step.

[Conventional technology]

When processing a large number of exposed photosensitive materials for printing (hereinafter collectively referred to as 23 plates), an automatic processor is generally used.

When processing the exposed 23rd plate in an automatic processor, there are two methods: developing by spraying a developer while horizontally transporting the 23rd plate, or using a developing tank containing a large amount of developer. A method has been used in which a 23rd plate is curved and conveyed while being immersed and developed. In all of these processing methods, it is necessary to prepare a large amount of developer to process one plate of 23 plates. In addition, in order to use the developer economically, it is recycled and reused, and during this process, the developer deteriorates due to the absorption of carbon dioxide gas from the air, in addition to deterioration due to processing, and the deteriorated developer is often used. It has to be replaced, which makes managing the developing work extremely troublesome.

In order to improve the above-mentioned drawbacks, there is a known method to keep the development process stable by replenishing the replenisher when processing the 23rd plate with a large amount of circulating and reusing developer.
No. 4502, No. 55-115039, No. 58-953
No. 49, etc. Although this replenishment method reduces the frequency of fluid exchange, it is still necessary to replace the fluid.
In addition, it was not possible to solve the problem of replenishment accuracy and the replenishment fluctuation due to differences in the types of PS plates. In addition, a replenishment device is required, and not only is the replenishment device itself expensive, but also requires adjustment and maintenance of the replenishment device.

JP-A-55-32044 discloses a processing apparatus which eliminates the troublesome replenishment method and saves developer. This is equipped with a developer spreading plate close to the PS plate conveyance path in the automatic developing machine, and spreads the developer applied on the 28 plate surface, but this! ! In the method of processing a PS plate with a small amount of developer using a machine, the PS plate being transported is not necessarily horizontal but is slightly distorted up and down, so the amount of developer tends to be uneven, resulting in uneven development. It is easy to use, and it takes time and effort to adjust the gap between the PS plate being processed and the developer spreading plate.
There is a disadvantage that it takes a lot of water, especially when using a small amount of developer at 28
When dripping directly onto the plate surface, there will be a difference in development speed between the dripping area and the non-dropping area, and this difference will remain even after the developer has passed through the developer spreading plate, resulting in uneven development and resulting in an undesirable printing plate. be.

We have improved upon these drawbacks and developed a PS plate development method and apparatus that can stably perform development using a small amount of developer (Japanese Patent Application No. 81872/1984, etc.). However, we have found that the technique of developing using a small amount of developer has a problem in that developing defects occur at the leading edge of the PS plate due to lack of developer.

[Problem that the invention seeks to solve]

The present invention aims to solve the various problems associated with replenishing the developer, and to provide a stable and economical PS plate development method and an apparatus used therein.
The purpose of Sl is to provide an automatic development processing method for PS plates that can always maintain stable development processing using a small amount of developer. A second object is to provide an automatic development processing method for PS plates that does not require developer management or solution replacement and has improved workability. A third object is to provide an inexpensive automatic development processing method for PS plates that does not require a replenisher or developer replenisher. A fourth object is to provide an automatic development processing method for PS plates that can always produce a uniform finish even when using a small amount of developer.

[Means for solving problems]

As a result of studies in accordance with the purpose of the present invention, it was found that in a processing method in which a necessary amount of developer having development activity is supplied for every 25th plate, and the development is performed using an automatic developing machine, the developing roller is placed on the receiving side of the 28th plate. The objective was achieved by a PS plate development method characterized by forming a developer reservoir in contact with the loaf.

The developer reservoir may be any structural member that can retain the developer between it and the developing roller, such as a roller in contact with the developing roller, a roller-shaped liquid retaining member, or a tuber, but a tuber is most preferred.

The tuber may be made of metal, resin, hard rubber, or the like that is inert to the developing solution, and folds may be provided at both ends of the tuber that meet the end of the developing roller to improve liquid retention.

The developing roller according to the present invention is preferably a roughened roller as shown in FIG. 2, and the material is selected from rubber, metal, ceramic, wood, resin, etc., but the material is selected from rubber, metal, ceramic, wood, resin, etc. Resin is preferred. The diameter of the roller is 10-200mm
, preferably 20 to 100 mm.

Next, the present invention will be explained using figures.

! Figure S1 shows an example of the aspect of the present invention as a schematic side view.

In the figure, PS is a PS plate that has been exposed, has been further corrected with an eraser, or has the eraser removed by washing with water. 1
1 is a carry-in roller, 2 and 3 are developing rollers with a roughened surface, and a double wheel is used to retain the developer by roughening the surface. 4 is a squeeze roller.

Reference numeral 5 designates a developer 7xle for supplying a predetermined amount of new developer solution, and 6 designates a tuber that forms a developer reservoir provided on the PS receiving side of the developing roller 2. The new developing solution is sent from the new developing solution tank 7 to the developing solution nozzle 5 by the feeding pump P, and is ejected toward the developing roller 2.

Development using a new solution is performed between developing rollers 2 and 3. In the embodiment shown in Fig. tj41, a used developer with remaining development activity is sprayed from a developer spray nozzle between the developing roller 3 and the squeeze roller 4 to ensure complete development and removal of uneven development. There is. The developer is removed by the squeeze roller 4, and the PS is sent to the next process.

The side edge of the tuberous root 6 close to the developing roller 2 and the developing roller (7, o
The gap between the image roller 2 and the image roller 2 is ~5 mm, preferably 0.5 mm.
It is 1 to 1 mm.

As a result, the roughening roller 2 is wetted with the developer before coming into contact with the PS, and at the same time as the 28th plate passes through the roughening roller 2, the developer holding system of the roughening roller 2 is filled with the developer and the surface of the 23rd plate is wetted. be transferred. The amount of transfer is determined by the amount of retention agent, and by appropriately selecting the amount of retention agent, it is possible to uniformly apply an arbitrary amount of developer over the entire surface of the PS plate.

For example, in the case of the roughening roller shown in FIG.
If 300cm/5h, the amount of developer is 50-50
It falls within 0mf/sin.

23 The developer uniformly placed on the plate surface is maintained as it is for the time required for development, but the development time depends on the PS plate conveyance speed and the distance between the roughening rollers 2 and 3, and in the example of Pt51, 3. It is determined depending on the distance of the developer squeeze roller 4.

The development time is 5 to 120 seconds, and the development temperature is 10 to 40 seconds.
Preferably, it is used within a temperature range of .degree.

There is no restriction on the processing method after the developer is supplied onto the 23rd plate according to the method of the present invention, and any method can be applied.

For example, after supplying the developer onto the 23rd plate, a development acceleration process can be added. All physical, chemical, electrical, and mechanical means for accelerating development can be used for the development acceleration operation.

Mechanical acceleration means include a method of rubbing the plate surface, for example, a method of rubbing with a rotating roller-like rubbing member, a method of rubbing by rotating a flat-shaped rubbing member, a method of rubbing the plate-like rubbing member back and forth and/or left and right. Examples include a method of rubbing by moving a roller-shaped rubbing member or a flat-plate-shaped rubbing member while rotating it and moving it back and forth and/or left and right. Note that a plurality of these rubbing members may be used in combination, and these rubbing members can be created using, for example, a brush, a sponge, or cloth.

Other development accelerating means include, for example, a method of blowing high-pressure air, a method of irradiating ultrasonic waves, a method of applying vibration to the 28th plate, and an electrochemical development method as described in JP-A No. 58-42042. Examples include a method of heating the developing solution on the 23 plate instantly by irradiation with microwaves, and a method of honing the plate surface using a processing solution containing abrasive powder.

Furthermore, in addition to the development process according to the present invention, an automatic developing machine to which the method of the present invention is applied may include, if necessary, a development stop process after the development process (the stop process solution includes a disposable method or a cyclic use method). Each individual treatment step of the fuwafufu treatment step,
A development stop treatment step followed by a degreasing treatment step, a treatment step that combines a development treatment step and a desensitization treatment, or a combination of a development stop treatment step and a desensitization treatment step, such as JP-A-54-8002. It may also include the processing steps described in the No. Further, each of the development processing step and other steps may be plural. For example, as described above, the development processing step may be divided into a ml development processing step and a second development processing step.

The unnecessary liquid used in the above-mentioned development process and post-development process is treated as waste liquid, but it is desirable to temporarily store it by providing a waste liquid tank or the like.

The 28 plates used in the method of the present invention include those in which a photosensitive layer whose solubility changes upon irradiation with light is coated on a support, and a soluble layer in which an image-like renost layer can be formed by an electrophotographic method or the like. is provided on a support.

The above-mentioned photosensitive layer contains a photosensitive substance as an essential component, and representative examples of the photosensitive substance include a photosensitive compound, a photosensitive and compound, and an ethylenically unsaturated double bond. compounds, epoxy compounds that polymerize with acid catalysts, silyl ether polymers and C-
Examples of photosensitive noazo compounds include a combination of a compound having an 0-C- group and a photoacid generator, and 0-ki7
Negative-type compounds whose solubility decreases upon exposure include aromatic noazonium salts and the like.

〔Example〕

Hereinafter, specific examples of the present invention will be shown.

Example 1 A straight roller 1 made of Bakelite was used as the roughening roller, except for the roughening roller 3 shown in FIG.
This 1.0-φ g4 wire is continuously rolled all the way without any gaps, and the 23rd edition is SMP-N (product name, Bottai 15th edition, manufactured by Konishiroku Photo Co., Ltd.) 1003-■ X800
mm size was used, and a developer having the following composition was used. Development zone (length of surface roughening roller 2, squeeze loaf fill containing developer) is 400w*ms Development time 20
When continuous plate processing was performed at 100 seconds, the amount of developer was 160 ml per plate, and good development of the gold layer was achieved.
The first and 100th layers of the obtained plates are Heidel GT.
As a result of printing with an O type printing machine, the same gradation and mesh, α
The printed matter had good reproducibility and was good for practical use.

developer Sodium silicate (JIS standard sodium silicate No. 3) 10.

Sodium hydroxide 2.7g Perex NBL (sodium alkylnaphthalene sulfonate, manufactured by Kao Atlas Co., Ltd.) 0.25° water

987g Comparative Example 1 Using the same 23rd plate and developer as in Example 1, the third
Development was performed using the apparatus shown in the figure. The developer is dripped onto the plate 23 from the developer nozzle 5, and the developer droplets are spread onto the plate 23 by the spreading plate 6' having the facing slope of the PS of the plastic sheet.
It is spread out on the third plate, developed, and conveyed on a guide plate to complete the development.

The distance from the developing solution dripping position to the end of the spreading plate 6' is 5.
0-, development zone 400e+dark, development time 20 seconds,
When the development process was carried out at a developer amount of 160 mN per plate, the developer was evenly spread over the PS plate surface, but
There was a difference in the speed of development between the dripping area and the non-dropping area of the developer dripping from the developer dripping pipe 33, resulting in non-uniform development.

When the obtained plate was printed under the same conditions as in Example 1, uneven reproduction of halftone dots occurred, and ink was deposited even in the non-image area i.

Example 2 The development zone was the same as in Example 1, and the surface roughening roller was a 0.8-diameter copper wire wound continuously without any gaps, and the P and S plates were 5WN- N (trade name, Negagata 23 version, manufactured by Konishiroku Photo Industry Co., Ltd.) was used, and the developer was 5DH-21 <trade name, manufactured by Konishiroku Photo Industry Co., Ltd.] diluted 4 times with water. When the same development process as in Example 1 was carried out, the amount of developer was 80 ai' per plate, and the development process was good for all layers. Further, when the obtained plate was subjected to Offsera F printing in the same manner as in Example 1, similarly good results were obtained.

Comparative Example 2 As a result of developing in the manner of Comparative Example 1 under the same conditions as Example 2, as in Comparative Example 1, a difference in developing speed occurred between the dripping part number of the pipe nozzle and the non-dropping part. Similar results to Comparative Example 1 were obtained.

〔Effect of the invention〕

According to the present invention, stable and uniform development is possible in a method of supplying a relatively small amount of developer for development.

[Brief explanation of drawings]

FIG. 1 is a schematic side view showing an example of a developer supply device used in the method of the present invention, and FIG. 2 is a schematic front view (A) showing an example of a roughening row 2, and an enlarged view or a partial view thereof. Figure ff53, which is an enlarged illusion diagram (b), is a perspective view of a developing device used for comparison. 1-m-carrying roller 2 and 3-m-roughening roller 4-11 squeeze roller 5-m-developing solution nozzle 6-1 to tuber 7--1 new developing solution tank Applicant: Konishiroku Photo Industry Co., Ltd. Figure 1 1: Carrying in 0-ra 8: Side (t A and Suareinosu 2.3: m-plane 1 roller 9:
Eve J Condolences 1 Color Futai Tera Tank 4: Suge 4-zu D-Ra 10: Waste Iζri〉ri 5 ° Gentsuki 15 Nosu °
16: Engineer Riyora 7 support #fr5 good tank figure 2

Claims (2)

[Claims] (1) In a processing method in which a necessary amount of a developer having development activity is supplied to each photosensitive material for printing and the development is performed using an automatic developing machine, the developer is in contact with the developing roller on the side of the developing roller that receives the photosensitive material for printing. A method for developing a photosensitive material for printing, characterized by forming a puddle. (2) The method for developing a photosensitive material for printing according to claim 1, wherein the developer reservoir is formed by a bank plate.