JPS5825477A - Etching method for lithographic printing plate - Google Patents

Abstract

PURPOSE:To decrease the fatigue of an etching soln. by dividing a rinsing stage in to two stages and scraping the photosensitive layer of the nonimage parts in the 1st rinsing stage without scraping said layer in an etching stage having an immersion part into the etching soln. CONSTITUTION:A printing original plate 1 which is made by coating a photoconductive sensitive layer on a substrate and is formed with sensible toner images by electrostatic charging, exposing, developing and fixing is fed to a conveying system of an etching stage A, and is conveyed in a horizontal direction with a conveying means 2. During this time, an etching soln. 3 is supplied onto the surface of the plate 1 with showers 4, thereby wetting the photosensitive layer in the nonimage parts. The plate 1 is conveyed successively to the 1st rinsing stage B, and the 2nd rinsing stage C. Both stages B, C have scraping parts 6A, 6B consisting of brushing rollers and scrape off the nonimage parts wetted with said soln. 3. The plate 1 is conveyed successively to a gumming up stage D and a drying stage E.

Description

[Detailed description of the invention]

The present invention relates to a method for etching a lithographic printing plate. More specifically, printing m′Iji with a photoconductive photosensitive layer
The present invention relates to a method for etching a toner plate using an electrophotographic method. In conventional etching methods such as the 28 plate having a photosensitive layer on a support, the etching solution made of alkaline liquid is controlled at a level of iiK during the etching process, and the plate surface moves horizontally. The liquid is supplied from above in a shower format, and the liquid collected from the print is returned to the menta 11 and used while being circulated and concentrated by a pump. Then, the plate is immersed in the etching solution for one hour in the same Menta bath, and after the printing plate is finished, the non-S* area photosensitive layer is scraped off using a scraping section made of a brushing roller or the like. Therefore, as the number of sheets processed increases, the non-S* photosensitive layer becomes mixed into the etching solution, and the etching solution becomes fatigued quickly. SUMMARY OF THE INVENTION Therefore, an object of the present invention is to avoid the scraping process using a brushing roller or the like in an etching process having an immersed part in an etching solution, to prevent the non-S* photosensitive layer from being mixed into the etching solution, and to reduce fatigue of the etching solution. There is a method for etching a lithographic printing plate which provides a significantly lower t1%. Another object of the present invention is to separate the rinsing liquid into a first rinsing part and a second rinsing part, which are used for circulation and regeneration, in the step of scraping off the non-S* photosensitive layer using a brushing ruler or the like, and each is independent of the other. Etching process for lithographic printing plates that reduces fatigue in each tank by making the tanks similar to each other! We are here to provide you with a method. Other objects of the invention will become apparent from the following description of the specification. The above objects of the present invention include a photoconductive photosensitive layer on a support;

Etching solution t is applied to the plate formed with a set of neritic acid (through a process including charging, exposure, development, and fixing with a used printing original plate).
1@wru etching liquid 1! and a lithographic printing plate etching method comprising a treatment including a rinse using a rinse solution, wherein the etching step includes scraping off a non-S* photosensitive layer that has been etched with the etching solution; The weighting tax is divided into at least two processes 11, the first rinsing 1 and the second rinsing 11, and! This is achieved by the etching processing power method of the lithographic printing plate, in which at least the first rinsing step of 4b has a scraped-off portion of the non-S* photosensitive layer. According to a preferred embodiment IIK of the present invention, the above-mentioned lithographic printing I[O etching method KjiP according to the present invention, [1] IIF! The rinsing process also includes scraping off the non-S* photosensitive layer; [2] each of the first rinse chamber and the second rinse chamber has a separate rinsing liquid tank; 3] As a subsequent process of the rinsing process, use a gumming process followed by a drying process. Further, according to a preferred embodiment, [4] a method for etching a plate formed with a toner image, the method comprising: moving an etching liquid controlled to a constant iIt horizontally on the plate; In the etching process, the non-image area photosensitive layer tllII4 is supplied by a shower method, and the non-image area photosensitive layer etched with the etching solution is scraped off by a scraping section consisting of a brushing roller on a horizontally moving plate surface, and rinsed. The liquid is supplied from a horizontally moving plate using a shower method,
# to elute the 5g5s light layer! 1 rinsing step, has a rinse liquid shower, and also has an alN! A A liquid tank for the rinsing liquid to be used [, separate from the rinsing liquid layer in the first rinsing step 1I
il′1! A second rinsing step that takes place once per step, a gumming step that forms a thin and uniform liquid layer on the printing plate after rinsing, and a drying step 1 that dries the gum liquid layer; This is to adopt the following configuration. Moreover, according to the preferred method of the present invention, [5] 6 blocks 1 are independent and divided into 2 or more blocks), and the plate is drawn in a straight line on the same horizontal plane of each kingship. In addition, each block's II document transport It can be variably set independently, and the overall plate transport speed rlli1 can be set independently.
[6] The whole process from the etching process and the whole process after the first rinsing process are divided into two independent blocks. [7] The process from the etching process It is divided into three independent blocks: the entire process, the entire process after the drying process, and the entire process located in the middle of the two. That's true. In addition, the configuration of any one of [5), [6] and [7], etc., is 1 desired 111 or less, and 1F
It is possible to perform arbitrary operations such as increasing the L conveyance speed, increasing the plate conveyance speed to the 11th order and increasing the plate conveyance speed to the 11th order at a desired machining distance of 1 m or less, or increasing the speed and then slowing down. The details of the present invention will be explained based on the representative example shown in Figure 1.
III, on which an S-image of the toner is formed by a process including charging, exposure, development, and constant*t-, is first sent to the transport system of Etching@A, and transported by a transport means such as a roller. 2 and transported in the horizontal direction. In this etching processing system, an etching (IIS) composed of an alkaline solution controlled at a constant temperature of 011K is supplied by a shower 4 from above the surface of the plate to remove the non-image area (the area to which toner is not attached). Swell the photosensitive layer. etching i
[After the etching process with S, the etching liquid layer remaining on the surface of the horizontal plate is removed by a squeeze unit 5 which includes means such as using a squeeze roller such as a mirror roller or blowing pressurized air. Remove. Thereafter, version 1 enters the Illustrator 11B and subsequently enters the second Rinseer IIC. 1st Linsny 1 and sB
In the rinsing process, each
Scraping part @A, @1191Ii1 consisting of a brushing phantom roller formed of a non-m*ii photosensitive layer TST iron-based fiber, which is scraped off by turning once in the same direction as the direction of the advancing force, Rinsing liquids 7 and 11 made of water, etc. are used to clean the mtm moving in the horizontal force direction, from the shower room, and from the Hatake BK. This rinsing liquid layer OI on the track surface
The ridges are removed by a squeeze section 5 consisting of a squeezing roller or air blowing means, etc., and sent to the ridge gumming roller. In the gum puller SO, plate 1 moving in the horizontal direction is
The shower 9 provides a thin and uniform layer tm of liquid 10. Subsequently, plate 1 is transported to drying process E, where a constant l1
The material is dried by passing through a drying container 1 (preferably separated from the outside by an air curtain φ) under fK control and completing plate making. In the diagram, 12A and 12m are J11 Tunsue 111 and 1
112 Rinse 11C is a separate rinsing liquid tank. t, 13 and 144 respectively indicate an etching liquid tank and a ^ liquid tank; 15 is a pump;
1@t! Prowers 1 and 17 indicate return information to each i11 to return to the store. The lithographic printing plate (I[Wl) subjected to the etching-burying method according to the present invention has a photoconductive photosensitive layer 11111 on a support.
If it is a lithographic printing plate that has been prepared and the toner particles are formed by MIK, a process that includes charging, exposure, development, and fixing, a deviation may be acceptable. After polishing, anodizing, graining, and other surface roughening treatments, the roughened surface i1K% photoconductive organic pigment is dispersed in O11 fat such as 7-grade Kol street resin to give a good photoconductive feel. An electrophotographic photoreceptor is preferred, in which a photolayer, especially copper phthalocyanine, is dispersed in a novolac resin and a photoconductive photosensitive layer is provided.
The fAS liquid contains 11 colors 11i11 (carbon black, copper 7 talocyanine, etc.), copper coating, and charge 11IA@cutting in a carrier liquid consisting of an electrically insulating liquid. Polyethylene as a cover rope,
An electrophotographic wave body image using one type of polypropylene, an ethylene copolymer, a propylene copolymer, or F12 or more types, and a negatively charged w#Nt image made of a phosphate ester-based active steel as a charge control abrasion. However, 311 is preferable! The developing solution used in the soda processing is not limited to the above, and can be replaced with any developer for negative-positive, positive-bodied, etc., depending on the exposure method. A typical example of the 73 method or device for forming a toner image using the planographic stamp 111 as described above is shown in FIG. , lithographic printing 11 Fully automatic [
It can be used as a plate-making device. Therefore, a method for manufacturing a lithographic printing plate shown in FIG. 92 will be explained. This method involves an automatic plate feeding process system 11 corona charger 2 (IK
Therefore, a charging process system 2 for charging the photoconductive photosensitive layer;
A light source 22 passes through an optical system 211t from an original placed on an original platen 21 onto a photoconductive photosensitive layer that is stopped on an exposure table 23.
) An exposure worker 1m3 performs exposure, and a developer 1m3 performs development by passing a developer 24 in which toner particles formed by exposure are dispersed through a reservoir 25. 4. A rinsing process in which all the excess toner accumulated on the non-image areas on the photoconductive photosensitive layer during development is washed with a 2T rinsing solution flowing out from the shower 1 inch. - The drying process of removing and drying the rinse solution, fi
The toner image formed by the process is thermally fixed by a contact method and /l or a non-contact method.
Cooling process to cool the 8-6 steps 1! A method for producing a lithographic printing plate is characterized by comprising: Then, this plate making force method, automatic plate feeding process M1, charging/exposure process @A2, M3,
Each process of liquid developing process 14, rinsing process 5, drying/fixing/cooling 1, process 7, and process 8 are independent blocks, and the plate 13t - each process runs in a straight line on the same horizontal plane. In addition, each block can be guided and conveyed at a speed of [
This is a method for producing a lithographic printing plate characterized by adding a variable #& to 151 ta and making it possible to increase the overall conveyance speed tvI4y.・

[Brief explanation of drawings]

Fig. 1 is a process diagram showing a hidden example of the method of the present invention;
The figure is an example of a method for manufacturing a lithographic printing plate used to obtain a printing plate with a *1 formation to apply the method of the present invention. It is each process diagram shown. In each figure, independent blocks are shown in the areas surrounded by lines. In the figure, A shows the etching process, B shows the first rinsing process, C shows the second rinsing process, D shows the force pulling process 1, and E shows the drying process. Patent applicant: Konishiroku Photo Industry Co., Ltd., agent patent attorney
Nobuaki Sakaguchi (TI or 1 person)

Claims (7)

[Claims] (1) An etching process using an etching solution and rinsing on a printing plate in which a toner is formed by a process including exposure, development, and fixing of a charged ink on a printing original plate having a photoconductive photosensitive layer formed on a support. Liquid [Rinse to use 1 it-
Including! A lithographic printing plate etching method 117j in which the etching step includes scraping off a non-image area photosensitive layer swollen with an etching solution, and the step described above is a first rinsing step. The method is separated into at least two steps including the second rinsing step, and further includes at least wrinkle removal.
1. An etching processing power method for a lithographic printing plate, wherein the rinsing step includes a scraping off portion of the non-III Sobe photosensitive layer and t-% mold. (2) The second rinsing step also includes scraping off the photosensitive layer in the non-image area! 1. Etching process of lithographic printing plate according to item 1 117j method. (3) Each of the rinse steps 1 and s2 has a separate and independent rinse tank.
% mold. (4) As a post-process of rinsing 1, the scope of the claims is characterized in that it has a gumming process using a gas drying process and its drying process! 1. A method for etching flat printed shoes according to any one of items 1 to 3. (5) A method for etching a large plate on which a toner image has been formed, in which an etching solution controlled at a constant Il[K is supplied in a shower format from above the plate surface moving horizontally, so that a non-image Erataten mite 1 that swells the photosensitive layer
The non-'#I outer photosensitive layer that has been etched with the etching liquid is scraped off with a scraping section consisting of a brushing roller on a horizontally moving printing plate, and the rinsing liquid (shower type from above the horizontally moving III) is removed. In the first rinsing step, the rinsing liquid O liquid tank t1 is provided with a rinsing liquid tank and is used in one concentrated cycle. $2 in a sentence! After rinsing, the process includes a gluing process to form a thin and uniform gum liquid layer like a print, and a drying process to dry the gum.
A method for etching a lithographic printing plate according to claim 8 and JIJ. (6) Each process is divided into two or more independent blocks, and each mt material can be guided and conveyed linearly on the same horizontal plane, and the plate conveyance speed of each block can be adjusted independently. Claims 111 to 111 are characterized in that the overall feeding speed can be adjusted by 1jt by modification and addition.
#! A method for etching a lithographic printing plate according to any one of Item 5-1. (7) The entire casting process from the etching process and the entire process after the fsl rinsing process 1 are divided into independent blocks 2'), i. -Eratin of printing plates (8) It is divided into three independent blocks: metalwork 1 from the etching process, the entire process from the drying process, and the entire process located between the two processes for wrinkles. The lithographic stamp 11110 etching processing power method according to claim 6, characterized in that: