JPH044194A - Device for treating surface of printing plate substrate - Google Patents

Abstract

PURPOSE:To make a low-cost equipment available and use vapor in a required amount regardless of the thickness of a substrate without flawing the substrate by a method wherein a small liquid tank part through which a printing plate substrate is passed by being supported by a roller is disposed at either or both of an inlet part and an outlet part for the printing plate substrate supplied from or discharged to the external of the device. CONSTITUTION:A substrate 1 which has been provided with an anodized film and thereafter etched is put into a vapor sealing device 3. The etched surface is vapor sealed by vapor sprayed from vapor supply nozzles 2. Next, the substrate 1 is passed through small tank parts 6, 7 by being supported by rollers 8. The small tank parts containing liquid are disposed at an inlet part 4 and an outlet part 5 for the substrate 1 supplied from or discharged to the external of the device. In this manner, the inlet and outlet parts 4, 5 are sealed with the liquid in the small tank parts 6, 7. In this manner, a sufficient hydrophilic treatment can be performed, a quality can be improved and stabilized, and a cost can be lowered.

Description

Detailed Description of the Invention [Industrial Application Field] The present invention relates to a surface treatment device for a printing plate support, and in particular, a method for sealing a printing plate support with water vapor after forming an anodized film on an aluminum plate. This relates to the entrance/exit part of a surface treatment apparatus for processing or steam sealing after dyeing an aluminum plate with a dye. [Prior Art] Conventionally, when an aluminum plate (including aluminum alloy) is used as a printing plate support (hereinafter referred to as support), an anodized film is formed on the aluminum plate, but the support and photosensitive composition After etching the anodic oxide film for optimal adhesion to objects, the pores are sealed with steam or hot water to create a film that is stable over time, has good developability, and is free from dirt in non-image areas. There is a surface treatment device for a support that provides a photosensitive printing plate (Japanese Patent Publication No. 56-12518).
(see publication).

In such equipment, where the surface of the support is continuously treated using steam, the entrance and exit of the chamber where the support is treated with steam must be equipped with measures to prevent steam leakage (sealing measures) without contacting the surface of the support. Is required.

A non-contact sealing device for the support surface is a device that supports the back surface of the support with rollers, narrows the gap between the support surfaces as much as possible, and provides an exhaust port on the surface facing the support surface (specially (Refer to Japanese Patent Publication No. 131470/1982), as shown in Fig. 3, a non-contact labyrinth structure 11 sealing portion is provided on both sides of the support l at the entrance and exit of the support to minimize the escape of water vapor, etc. was used.

[Problems to be Solved by the Invention] However, in all of the above devices, (1) it is necessary to manufacture highly accurate sole equipment at the entrance/exit portion.

(2) In order to prevent failures due to scratches on the support due to flopping of the support, there is a limit to the clearance of the gap, and the effect of preventing leakage may not be obtained.

(3) In areas where the thickness of the support or the fluttering behavior of the support is unsteady, such as the joint between the new and old supports, it is necessary to add equipment to increase the clearance, resulting in complex and large-scale equipment.

(4) The amount of steam used becomes larger than necessary.

It had the following problems.

The purpose of the present invention is to solve the above-mentioned conventional problems, to use inexpensive equipment, to avoid damaging the support regardless of the thickness of the support and to reduce the amount of steam used. It is an object of the present invention to provide a surface treatment device for a printing plate support having an opening/exit portion that can be opened and opened.

[Means and effects for solving the problems] The above object of the present invention is to provide an apparatus for continuously surface-treating a printing plate support using water vapor, in which the printing plate support enters and exits from the outside of the apparatus. This is achieved by a surface treatment device for a printing plate support, characterized in that at least one of the outer parts (3) and the outer part (3) is provided with a small tank part for a liquid through which the printing plate support passes while being supported by a roller. be done.

In the present invention, the entrance and exit of the apparatus of the present invention are sealed by the liquid in the small tank by passing a support body through a small tank having a liquid provided at the entrance and exit, supported by a roller.

Since the support passes through the liquid, there is no need to worry about scratches or clearance.

Embodiments of the present invention will be described using figures.

FIG. 1 is a side sectional view of one embodiment of the printing plate support surface treatment apparatus of the present invention, and FIG. 2 is a side sectional view of another embodiment of the present invention.

As shown in FIG. 1, in the present invention, for example, a support 1 that has been etched after forming an anodic oxide film enters a steam sealing treatment device 3, and the etched surface is etched by steam sprayed from a steam supply nozzle 2. 4. An inlet section that is subjected to steam sealing treatment and that enters and exits from the outside of the device. Small tank portions 6 for liquid, through which the supports 1 are supported by rollers 8 and pass through the outlet portions 5, respectively;
7 to seal the inside and outside of the device.

FIG. 2 shows a modification of FIG. 1, in which a water belly is created at the inlet 4 of the device from a water supply port 10 along the wall surface 9 of the device, and the support is a small tank for the liquid to pass through while being supported by rollers 8. A state in which part 6 is provided is shown. In this case, the small tank portion 6 serves as a tank for receiving the flowing liquid, but the steam sealing device 3 is sealed by the liquid as in FIG. 1.

The liquid used in the present invention is preferably hot water, but water at room temperature may also be used. Of course, it may be pure water, but at least one selected from organic solvents, amine compounds, organic acids, phosphorus oxyacids and their salts, sulfur oxyacids and their salts, and boron oxyacids and their salts. It is also possible to use hot or aqueous solutions containing the compounds.

In the printing plate support used in the present invention, first, the substrate is an aluminum plate, and pure aluminum and aluminum alloy plates are included.

Various aluminum alloys can be used, such as silicon, wj4. manganese, magnesium chromium,
There are aluminum alloys with metals such as zinc, lead, bismuth, and ninkel.

The aluminum plate is first cleaned of oil, rust, dirt, etc., and then grained if necessary.

After graining, etching treatment, formation of an anodic oxide film, and subsequent etching are performed, and the details of these treatments are as described in Japanese Patent Publication No. 12518/1983. Further, etching treatment before and after the anodic oxidation film may be omitted.

The material that has been surface-treated as described above is referred to as the printing plate support of the present invention.The continuous surface treatment using steam in the present invention means that the temperature of the steam treatment is approximately 80 to 80℃. Preferably about 90-120 at 200°C
'C. Processing time is 3 seconds to 30 minutes, preferably 5
It is from seconds to 10 minutes.

The appropriate hydrogen ion concentration is about 2 to 11, preferably about 3.
~10. The pressure when processing with pressurized steam is approximately 1~
15 kg/cd (absolute) is suitable, preferably about 1-5 kg/cd.

The printing plate support obtained by the present invention has a highly hydrophilic surface and good adhesion to the photosensitive composition provided thereon, so it can be used as is, but if necessary, the surface may be further improved. can be processed. It is a primer process.

Regarding the photosensitive composition etc. applied to the surface, please refer to Japanese Patent Publication No. 56-12518.

【Example〕

The present invention will be further explained using one example.

Example 1 An aluminum plate having a thickness of 0.4 m and a width of 1500 m was coated with an anodic oxide film as a support, then etched, and passed through an apparatus as shown in FIG. 1 to perform a surface sealing treatment with water vapor. The pressure inside the steam sealing device 3 is 2.
The pressure is 0 mAq, the temperature is 98 to 102°C, and the conditions for the small tank part 6.7 are that the bottom dimension is 300w x 1800mm, and the height is 400mm. Hot water at 70°C is poured into the water tank, and steam sealing is performed. Prevented steam leakage at the entrance and exit of the device. The amount of steam used at this time was 150 kg/'hr.

Comparative Example-I An example of the conditions of a moisture sealing device using a labyrinth structure sealing device as shown in Fig. 3 as a conventional technique.
When maintained in the same manner as in 1, the clearance 12 at the narrowest part of the labyrinth structure that does not damage the support is 10
It was m. There are many steam leaks, and the amount of steam used is 950k.
g/hr, which required about 6 times more than Example-1.

[Effects of the Invention] As shown in the above description and examples, the surface treatment device for a printing plate support of the present invention has the following effects: (1) Steam leakage is eliminated, the amount of steam used is significantly reduced, and manufacturing costs are reduced. decreased.

(2) The equipment at the entrance and exit has become simpler, reducing equipment costs.

(3) Since there are no particularly narrow clearance points, stability during manufacturing can be achieved.

Furthermore, by immersing it in the liquid in the small tank for sealing,
We were able to perform sufficient hydrophilic treatment, contributing to improved quality, stability, and cost reduction.

[BRIEF DESCRIPTION OF THE DRAWINGS] FIG. 1 is a side cross-sectional view of an embodiment of the surface treatment apparatus for a printing plate support of the present invention, FIG. 2 is a side cross-sectional view of a modified example of the present invention, and FIG. 1 is a side sectional view of an example of an entrance/exit portion of a labyrinth structure according to the prior art. 1. Support 2. Steam supply nozzle 3. Steam sealing bag W 4. Inlet section 5. Outlet section
6.7...Small tank part 8...Roller 9...
Wall surface 10... Water supply port 11... Labyrinth structure 12... Clearance at the narrowest part

Claims (1)

[Claims] In an apparatus for continuously surface-treating a printing plate support using water vapor, the printing plate support is attached to a roller at at least one of an inlet portion and an outlet portion where the printing plate support enters and exits from the outside of the apparatus. A surface treatment device for a printing plate support, characterized by having a small tank portion for a liquid to pass through while being supported.