JPH04102854A - Method for dyeing waterless planographic printing plate - Google Patents

Abstract

PURPOSE:To prevent the staining by splashing of dyeing liquid in a dyeing stage by immersing a planographic printing plate after developing and washing stages into the dyeing liquid, thereby dyeing this plate. CONSTITUTION:This method is so constituted as to dye the planographic printing plate subjected to the developing and washing stages by carrying the plate by means of rolls 26 into a dyeing tank 24, directly the direction where the printing plate is carried in by means of a roll 21, further immersing the printing plate into the dyeing liquid of the dyeing tank 24 by means of a roll 20 having the diameter ranging 10 to 100mm thereby dyeing the printing plate. The roll 20 is rotated in the same direction and at the same speed as the transporting speed of the printing plate to guide and immerse the printing plate after the developing stage into the dyeing liquid so as to dye the printing plate in the case of immersion of the planographic printing plate into the dyeing liquid by brining the same into contact with the roll 20. The staining by the splashing of the dyeing liquid during the dyeing stage is prevented in this way.

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, a method for automatically processing a waterless lithographic printing plate is carried out using an automatic developing machine as shown in FIG. This automatic developing machine 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 sent in the direction of the arrow by a roller 1. It is 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 step, the washing liquid is supplied from the nozzle 4 to the waterless lithographic printing plate in a shower state, and the plate surface is rubbed by the brush roll 5 and washed with water. 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 washing process section, the washing liquid is supplied from the nozzle 7 in a shower state to the waterless lithographic printing plate, and washing is performed. 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 the form of a shower.

[Problem to be solved by the invention] By the way, when the dyeing solution is supplied in the dyeing process using a one-way shower system, the dyeing solution splashes, which stains the inside of the dyeing tank and the lid, which requires a lot of effort to clean. There was a problem.

Therefore, the present invention has developed an automatic developing machine installed in the dyeing process section.
The purpose is to prevent this.

[Means for Solving the Problems] 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 waterless lithographic printing plate in the staining solution. This can be achieved by employing a waterless lithographic printing plate dyeing method characterized in that the printing plate is immersed.

Methods of immersion include a method using a roller and a method of immersing the material in a liquid filled by passing it through a slit, but the method is not limited to these. A different immersion method can be used.

The time for immersion in the dyeing solution is 3 to 60 seconds, preferably 3 to 20 seconds.

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

The dyeing solution used is one in which one or more dyes are dissolved or dispersed in an aqueous solution of an organic solvent such as water, alcohol, or ether.

Furthermore, this dyeing solution contains various surfactants such as acids or their salts, anions, cations, and nonions, chelating agents, and dyeing agents to improve dyeing density, prevent unevenness, prevent precipitation in the dyeing solution, and other purposes. Auxiliary agents etc. may be added.

It is preferable that the dyeing process is located after the development process, or that a process such as washing with water or rinsing is provided between the development process and the dyeing process in order to prevent the developer from getting mixed into 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 be used at all times.

The temperature of the dyeing solution may be controlled by providing a heater in the member for supplying the dyeing solution, in the dyeing solution tank, or in the solution path.

[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 1a shows a method of using a roll to immerse a waterless lithographic printing plate in a dyeing solution. The version is roll 2
The printing plate is carried into the dyeing bath by the roller 2o, and the printing plate is oriented in the conveying direction during the dip by the roll 2o.The printing plate is then immersed in the dyeing liquid in the dyeing bath 24 by the roll 2o, and during this immersion, the printing plate is dyed.

FIG. 1 shows a sectional view of the dyeing tank 24, in which a heater 33 is installed in the 11-way direction.

Thereafter, the dyeing solution is squeezed by the roll 22 and simultaneously transported to the next step.

The roll 20 is usually a skewer roll made of rubber or a rubber-like substance as shown in FIG. 2a.

When the roll 20 is brought into contact with the lithographic printing plate and immersed in the dyeing solution, it is preferable to rotate it in the same direction as the transport direction at the same speed as the transport speed of the waterless lithographic printing plate in order to prevent scratches on the plate surface. When the roll is brought into contact with the waterless lithographic printing plate surface, it may be driven to rotate.

In addition to the rolls 20 described above, ordinary rubber rolls or rolls such as those shown in FIGS. 2, c, and d can be used.

2B1C and 2D schematically show an example of the shape of the circumferential surface of the roll 2o, where A is a schematic front view and the opening is a partially enlarged view or partially enlarged perspective view.

FIG. 2 shows a concave portion with continuous vertical stripes, FIG. 2 C shows a concave portion with independent horizontal stripes, and FIG. 2 d shows a rough surface having convex portions on the roll surface. Preferably, it has continuous vertical stripes as shown in Figure 2.

Examples of preferred size ranges for the surface shapes shown in Figures 2, c and d are shown in Table 1 below.

The diameter of the roll 20 is preferably in the range of 10 mm to 100 mm, and the length of the cylindrical portion having a surface with various patterns may be equal to or longer than the transport width of the waterless planographic printing plate.

Table 1 The materials that make up the surface of the 0-ru 20 include plastics (e.g. phenol resin, urea resin, melamine resin, polyester resin, polyvinyl chloride resin, polyvinylidene chloride resin, polyacetic acid resin, etc.), dyed rubber, etc. Just choose one that is not easily affected by liquid.

In addition, the dyeing tank is a cartridge type tank, which eliminates the hassle of replacing the dyeing solution, such as filling the dyeing solution into the dyeing tank and returning it to the waste tank when it is discarded. It's convenient.

The overflow amount A of the staining liquid is returned to the staining tank, but may be disposed of as waste liquid.

Example 2 FIG. 3 shows a method in which a waterless lithographic printing plate is immersed in a dyeing solution by guiding and transporting it using a plurality of rollers.

The waterless lithographic printing plate is immersed in a dyeing solution while moving between a plurality of rollers, and dyeing is performed by spraying the dyeing solution onto the plate surface using a submerged sprayer 31. and then transported to the washing process. The dyeing tank is provided with a heater 32 having a shape long in the width direction in order to control the temperature of the dyeing solution.

Example-3 FIG. 5 shows a waterless lithographic printing plate brought in from the roll 26,
This figure shows a dyeing process section in which the waterless lithographic printing plate is conveyed through a slit S filled with the dyeing liquid, so that the dyeing liquid is supplied to the plate surface.

FIG. 5 shows a cross-sectional view of the slit S, and FIG.
FIG. 3 is a perspective view of a slit S.

The slit S consists of plate-shaped bodies 42, 43 having regular intervals. An implant system 4 is provided on the opposite surface of each plate-like body 42,43.
4 are provided. The plate-shaped body 42 is provided with an opening 46 for sending the dyeing solution supplied from the supply port 41 to the slit interval 45.

Stainless steel is used as the material for the plates 42 and 43, but other materials such as polyvinyl chloride, resins such as Teflon, and rubber may also be used.

Nylon 6/10 is used as the material for the implantation system 44, and one with a diameter of about 0.08 mm has a hair length of 1
．． The plate-like bodies 42 and 43 are implanted with hair to a thickness of about 5 mm.

Other resins or rubbers such as polyethylene, polypropylene, polyvinyl chloride, and Teflon may also be used as the material for the implant.

The slit interval is set to about 3 mm. The size of the slit S is: X = 850mm, Y = 170mm
That's about it.

The staining liquid is supplied from the staining liquid supply port 41 to the slit interval 45 through the opening 46. The image area is dyed by passing the waterless planographic printing plate through the slit interval 45 filled with the dyeing solution. At this time, by providing the implantation system 44, retention of the staining solution in the slit interval 45 is improved, and damage caused by contact of the printing plate with the slits is prevented.

[Effects of the Invention] As explained above, in the present invention, the waterless lithographic printing plate is immersed in the dyeing liquid in the dyeing tank in the dyeing process. This prevents the automatic processor from becoming dirty and eliminates the hassle of cleaning.

[Brief explanation of drawings]

Fig. 1 is a schematic diagram of the dyeing process section by dipping in Example 1 of the present invention, Fig. 2 a is a side view without showing the skewer-shaped toll, and Fig. 2, c, and d are roll dyeing process parts. 20 is a schematic diagram of the shape of the rough surface of the circumferential surface of No. 20. FIG. FIG. 3 is a schematic diagram of a dyeing process section in which a plurality of rolls of Example 2 of the present invention are immersed in a dyeing solution, and FIG.
FIG. 5 is a schematic diagram of a dyeing process section using a slit according to Example 3 of the present invention, FIG. 5 is a cross-sectional view of the slit, and FIG. 6 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. 1.21.23.26... Roll 2.4.6.7... Nozzle 3.5... Brush roll 20... Dipping roll 22... Squeezing roll 24... Dyeing solution 25.・・・
Overflow liquid tank 31...Liquid nozzle 32.33...Heater 4.
・Waterless planographic printing plate passage

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 immersing the waterless lithographic printing plate in a dyeing solution. A method for dyeing waterless lithographic printing plates.