JPH04102853A - Method for dyeing waterless planographic printing plate - Google Patents

Abstract

PURPOSE:To prevent the staining by splashing of a dyeing liquid by supplying the dyeing liquid to the outer peripheral surface of a surface roughening roll and supplying the dyeing liquid to a planographic printing plate along a rotating direction via this roll. CONSTITUTION:The dyeing liquid is not directly supplied from a dyeing liquid supply nozzle to the planographic printing plate and the dyeing liquid is once supplied to the roughened outer peripheral surface of the surface roughening roll 10. The dyeing liquid is supplied to the planographic printing plate after a development stage along the rotating direction via this roll 10. The dyeing liquid is dropped from a dyeing liquid nozzle 12 to the surface roughening roll 10 to supply the dyeing liquid in the prescribed amt. determined by the positional relation by the contact or non-contact of the plate surface with the surface roughening roll 10 and the grooves of the surface roughening roll 10. The dyeing to obviate the splashing of the liquid is then executed by the applying up to next squeezing rolls.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method of dyeing a waterless planographic printing plate, and particularly to a dyeing method of supplying a dyeing liquid to the plate surface in the dyeing process of a waterless planographic printing plate.

[Prior Art] Conventionally, as a method for automatically processing a waterless lithographic printing plate 11i11 plate, as shown in FIG.
This is done using an automatic developing machine. This automatic developing machine is
It is equipped with a developing process section, a first washing process section, a dyeing process section, and a second washing process section, and the waterless lithographic printing plate to be processed is sequentially conveyed in the direction of the arrow by the roller 1 and processed.

In the developing process section, a developer is supplied from a nozzle 2 to the waterless lithographic printing plate in a shower state, and a brush roll 3 rubs the plate surface to perform development. The developer is circulated through filter F and pump P.

In the first washing process section, the washing liquid is supplied from the nozzle 4 to the waterless lithographic printing plate in a shower state, and the brush roll 5 rubs the plate surface to perform water washing. After washing with water, it is circulated through filter F and pump P.

In the dyeing process section, the dyeing liquid is supplied from the nozzle 6 in a shower state to the waterless planographic printing plate, and the image area is dyed. The staining solution is circulated through filter F and pump P.

In the second rinsing step, the rinsing liquid is supplied from the nozzle 7 to the waterless lithographic printing plate in a shower state to perform rinsing. The washing liquid is circulated through filter F and pump P.

As described above, in this type of automatic developing machine, the dyeing solution is normally supplied from the nozzle in a shower state.

[Problems to be Solved by the Invention] By the way, when the dyeing solution is supplied to the dyeing process using a one-way shower system, the dyeing solution splashes and splashes, which stains the inside of the dyeing tank and the lid, which requires a lot of cleaning. The problem was that it was time-consuming.

Therefore, an object of the present invention is to prevent staining of an automatic developing machine installed in a dyeing process section.

[Means for Solving the Problem] This purpose is to provide a method for automatically transporting and processing a waterless lithographic printing plate after image exposure, in which the dyeing of the image area after development is carried out by the water tz L, the lithographic printing plate This can be achieved by employing a waterless lithographic printing plate dyeing method characterized in that it is carried out by applying dyeing 71k to the surface of the waterless planographic printing plate.

The coating method includes a coating method in which the dyeing solution is supplied via a roller, PET (polyethylene terephthalate),
There are coating methods that utilize a slit made of two bases made of resin such as nylon or polyethylene, or metal or light alloy such as aluminum or iron, or coating methods that pass through the slit, but are not limited to these. Application methods that do not cause splashing can be adopted for various liquids.

The layer to be dyed may be any layer in the image area, such as a brimer layer, a photosensitive layer, and other layers between the brimer layer and the photosensitive layer.

As the dyeing liquid, one or more types of dyes are dissolved or dispersed in an aqueous solution of an organic solvent such as water, alcohol, or ether.

Furthermore, various surfactants such as acids or their salts, anions, cations, and nonions, and Kir-1- are added to this dyeing solution for the purpose of improving dyeing density, preventing unevenness, preventing precipitation in the dyeing solution, and other purposes. dyeing agent, dyeing aid, etc. may be added.

In addition, in order to improve coating properties, the surface tension of the dyeing solution can be increased by 50 dyn by adding a surfactant to the dyeing solution.
It is preferable to set it to below e/cm.

The dyeing process is located after the development process, but in order to prevent the developer from getting mixed into the dyeing process, it is preferable to provide a process such as washing with water or rinsing between the development process and the dyeing process.
Furthermore, it is preferable to provide steps such as washing with water and drying after the dyeing step, if necessary.

Furthermore, the staining solution may be used repeatedly, or a new, substantially unused solution may always be used.

In the fourth part for supplying the dyeing solution, a heater may be installed in the dyeing solution tank or in the solution path to control the temperature of the dyeing solution.

[Examples] Next, examples of the present invention will be described based on the drawings, but the present invention is not limited to these examples.

Example 1 Figure 1 shows a method of supplying a dyeing solution to the treated surface of a waterless planographic printing plate, in which the dyeing solution is not directly supplied from the dyeing solution supply nozzle to the planographic printing plate, and the roughening port is first supplied. 10 shows a dyeing solution process section that supplies a dyeing solution to the roughened outer peripheral surface of the roll 10 and supplies the dyeing solution to the waterless lithographic printing plate via the roughened roll 10.

The waterless lithographic printing plate sent through the development process section and the first water washing process section is conveyed downward by rolls 11 to prevent the dyeing solution from flowing back into the previous process. The staining liquid is sent from the tank T through the filter and pump P to the staining liquid supply nozzle 12.

The sent dyeing solution is dripped onto the roughening roll 10 from the dyeing solution supply nozzle 12, and is supplied to the waterless lithographic printing plate along the rotational direction of the roughening roll 10. A predetermined amount of staining solution determined by the positional relationship between the printing plate and the roughening roll 10 and the grooves of the roughening roll 10 is supplied to the printing plate, and dyeing is performed until the next squeeze roll. At this time, the roughened outer circumferential surface of the roughening roll may be brought into contact with the waterless lithographic printing plate, or a gap may be provided to allow the dyeing solution to flow.

The angle between the straight line connecting the roll 9 and the roughening roll 10 and the perpendicular line is preferably 0 to 30 degrees.

When contacting with the lithographic printing plate, the pressure is 1.0
kg/cm2 or less is appropriate. When the roughening roll is brought into contact with a waterless planographic printing plate and a dyeing solution is supplied, it must be rotated at the same speed and in the same direction as the waterless planographic printing plate to prevent scratches on the plate surface. preferable. When the roughening roll is brought into contact with the surface of the waterless lithographic printing plate, it may be driven to rotate.

Incidentally, the overflow amount A of the staining liquid may be disposed of as waste liquid, and it is convenient to replace the staining liquid if the staining liquid tank T is of a cartridge type.

Figures 2 a, b, C, d, and e schematically show examples of the shape of the circumferential surface of the roughening roll 10. It is an enlarged perspective view.

Figure 2a shows continuous vertical bars, Figure 2 shows continuous diagonal bars, Figure 3C shows independent horizontal bars, Figure 2d shows intersecting vertical bars, and Figure 2e shows intersecting diagonal bars. , indicates the shape of a rough surface due to independent holes, concavities, unevenness, etc. In FIG. 2e, the asperities may be reversed.

Preferably, it has continuous vertical stripes as shown in FIG. 2a. Examples of preferred dimensional ranges for the rough surface shapes shown in FIGS. 2a, b, c, d, and e are not shown in Table 1 below. Roughening roll 1
The diameter of the 0 mm is preferably in the range of 10 mm to 100 mm, and the length of the cylindrical portion with the roughened surface may be equal to or longer than the transport width of the waterless planographic printing plate.

The material constituting the surface of the first surface roughening roll 100 is plastic (for example, phenol resin, urea resin, melamine resin,
It is best to choose from materials that are difficult to be attacked by the dyeing solution, such as polyester resin, polyvinyl chloride resin, polyvinylidene chloride resin, polyacetic acid resin, etc.), rubber, etc.

Example-2 Figure 3 shows the supply of staining liquid to a waterless lithographic printing plate using PET.
(Polyethylene terephthalate) This shows the dyeing process performed using heath and rubber rolls. The dyeing solution dripped from the dyeing solution supply nozzle 12 is uniformly leveled by the PET base 13 fixed to the support 14, and is supplied to the printing plate via rubber rolls 15, 16 made of silicone rubber or the like. The angle between the straight line connecting the centers of the rubber rolls 16 and 17 and the perpendicular line is 1 degree to 40 degrees, preferably 5 degrees to 3 degrees.
It is 0 degrees.

In this embodiment, by adjusting the angle and pressure of the PET base 13, it is possible to change the amount of staining solution supplied to the plate surface.

Example 3 FIG. 4 shows that the dyeing solution dropped from the dyeing solution supply nozzle 12 is temporarily held between the PET bases 18 and 19 fixed to the support 20, and the waterless lithographic printing plate is conveyed. This is the same as in Example 2, except that the staining solution between the bases is uniformly supplied to the plate surface.

Example 4 FIG. 5 shows a dyeing process in which a waterless lithographic printing plate is conveyed through a slit S that receives the staining liquid supplied from the staining liquid supply section 26, and the staining liquid is supplied to the plate surface. This shows the process section.

FIG. 6a is a sectional view of the slit S, and FIG. 6a is a perspective view of the slit S.

The slit S consists of plate-shaped bodies 21, 22 having regular intervals. On the opposite surface of each plate-shaped body 21, 22, an implantable type 2
4 is provided. The plate-shaped body 21 is provided with an opening 25 through which the dyeing solution supplied from the supply port 26 is sent to the slit interval 23.

As the material of the plate-like bodies 21 and 22, stainless steel may be used, or other materials such as polyvinyl chloride, resin such as Teflon, or rubber may be used. In addition, nylon 6/10 is used as the material for the implantation system 24, and the diameter is 0.08 mm.
The hair length is about 1.5 mm, and the plate-shaped body 21
．． Hair transplanted on 22nd. In addition to the above, resins or rubbers such as polyethylene, polypropylene, polyvinyl chloride, and Teflon may be used as implantable materials.

The slit interval is set to about 3 mm, and the length of the gap in the direction of the conveying force is set to about 50 mm.

The staining liquid is supplied from the staining liquid supply port 26 to the slit interval 23 through the opening 25. With staining solution? The image area is dyed by passing the waterless planographic printing plate through the 6Ti slit interval 23. At this time, by providing the implantation system 24, retention of the staining solution in the slit interval 23 is improved, and damage caused by contact of the printing plate with the slit is prevented.

[Effects of the Invention] As explained below, in the present invention, a coating method that does not cause splashing of the solution is adopted as a method of supplying the dyeing solution in the dyeing process, thereby preventing staining of the automatic processor. This eliminates the hassle of cleaning.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram of the dyeing process section using the roughening roll of Example 1 of the present invention, and FIG. 2 a, bc, d, and e show the rough surface of the roughening roll It is a schematic diagram of a shape. Furthermore, FIG. 3 is a schematic diagram of the dyeing process section using the PET base and rubber according to the second embodiment of the present invention, and FIG. FIG. 5 is a schematic diagram of a dyeing process section using a slit according to Example 4 of the present invention, FIG. 6 a is a cross-sectional view of the slit, and FIG. 6 b is a perspective view of the slit. FIG. 7 is a schematic diagram of an automatic developing machine used for processing conventional waterless planographic printing plates. 10... Roughening roll 9.11... Roll 12
...Dyeing solution supply nozzle 13.18.19...PET base 15.16.17...Rubber roll

Claims (1)

[Claims] A method for automatically transporting and processing a waterless lithographic printing plate after image exposure, characterized in that dyeing of the image area after development is performed by applying a staining liquid to the waterless lithographic printing plate. Dyeing method for waterless lithographic printing plates.