JP2898740B2 - Photosensitive resin printing plate with metal fastening bar - Google Patents

Description

Description: FIELD OF THE INVENTION The present invention relates to an improved photosensitive resin printing plate for mounting on a printing press. More specifically, the present invention relates to a photosensitive resin printing plate with a metal tightening bar, which is excellent in workability and durability, and is also excellent in plate fixability to a small printing machine because of its compact structure.

[Conventional technology]

The conventional method of mounting a photosensitive resin printing plate on a printing press is as follows:
As shown in FIGS. 1 (A) and 1 (B), on the top side and the ground side with respect to the printing direction of the photosensitive resin printing plate, a hardening section for mounting a printing press (hereinafter referred to as a bank) made of the same resin as the image section. It is wrapped around with a rotary mounting receiver that is pre-installed on the printing press. However, with this method,
In the case of photosensitive resin whose mechanical strength is not sufficient, the skill of the worker is required. However, there is a drawback that printing is loosened during printing due to the impact of the printing press, causing printing stains in the non-image area, so-called "sticking", and making it impractical.

On the other hand, if a plate with low mechanical strength or a soft plate is to be mounted on the plate mounting receiving side, the plate mounting receiver is not only required to have high machining accuracy, but also requires a complicated structure and is expensive. Problem.

On the other hand, as a method of fixing a photosensitive resin plate to a printing machine,
Although there is a method using an adhesive tape or an adhesive paste, not only workability is poor, but also running cost is high, which is not suitable for an industrial production system.

There is also a method in which a metal holding bar is attached to the top and / or the ground side in the printing direction of the photosensitive resin plate to fix the plate. However, since the support for the photosensitive resin plate is simply sandwiched, In order to obtain sufficient durability, the clamping bar becomes large and sturdy, and the plate mounting receiver becomes a large structure, so in the case of a transfer printing machine, the plate mounting receiver becomes large, Non-printable area (non-printing area)
Has the disadvantage of becoming large. The large non-printing area is a fatal problem depending on the type of printed matter.

[Problems to be solved by the invention]

The present invention can be easily mounted with an inexpensive mounting structure without depending on the physical properties of the photosensitive resin, by mounting a metal tightening bar instead of the conventional bank or a large metal or plastic holding bar. Further, it is an object of the present invention to provide a photosensitive resin printing plate capable of printing an extremely small non-printing area.

[Means for solving the problem]

The present inventors have conducted intensive studies to develop a photosensitive resin printing plate having good workability, excellent durability, excellent durability, and capable of minimizing a non-printing area. Was found to be most effective. The present invention has been made based on this finding.

As shown in FIGS. 2 (A) and 2 (B), the photosensitive resin printing plate of the present invention is prepared such that the top and bottom ends in the printing direction have no hardened portions. On the other hand, as the metal plate to be attached, iron, aluminum, brass, or the like is used.
This metal plate is processed in advance as shown in FIG. 3 (A), and can be pressed later with high accuracy. Next, as shown in FIG. 4, the end portion of the photosensitive resin printing plate is inserted, pressed in the order of FIGS. 5 and 6, and a metal plate is attached to the photosensitive printing plate by triple winding.

FIG. 7 shows the shape of a plate to which a metal tightening bar is attached. The dimension T may be within the range of the slit width of a rotary attachment receiver provided on a printing press, and is usually 0.4 mm to
6.0 mm is practically preferable. Also, the thickness of the metal plate is usually
0.1 mm to 2.0 mm is practically preferable, and if it is less than 0.1 mm, there is a problem in workability, durability and durability. The dimension W may be within a range that allows it to fall within the slit depth of the rotary mounting receiver provided on the printing press, and is usually preferably 2.5 mm to 1.5 mm in practice. The length of the metal fastening bar may be shorter than the length of the printing plate, and can be used as appropriate according to the structure of the rotary mounting receiver.

The photosensitive resin and the support used in the photosensitive resin printing plate of the present invention are not particularly limited, and may be arbitrarily selected from those commonly used in the production of conventional photosensitive resin printing plates. Although it is possible, a support having a thickness of 0.3 mm or less has good winding property and is practically preferable.

[Action]

The photosensitive resin printing plate with a metal fastening bar of the present invention uses a durable and durable metal plate for the printing plate fixing portion. It was possible to solve the problem, and it was possible to solve the contamination of the non-image area due to loosening during printing, and the workability at the time of mounting was improved, so that the worker did not need to be skilled. In addition, the compact winding bar has made it possible to apply the printing method with a small non-precutting area.

(Example) Example 1 A metal bar has a shape as shown in FIGS. 3A and 3B, is made of aluminum, and has a thickness.
One having a length of 0.15 mm and a length of 520 mm was used.

Using this metal bar, the edge of the support (polyester film thickness 0.11 mm) on the ground side is sandwiched in the printing direction of the photosensitive resin printing plate (photosensitive resin hardness: 35), And fixed. As a result, the seventh
A photosensitive resin printing plate having the tightening bar shown in the figure was obtained. At this time, W was 5.0 mm and T was 0.7 mm.

Example 2 Steel is selected as the material of the metal bar, and the thickness is 0.15 mm and the width is
W1 having a length of 4 mm and a length of 520 mm was used. It was fixed to a photosensitive resin printing plate in the same manner as in Example 1. As a result, a printing plate having a structure similar to that of Example 1 and having a tightening bar of 5.0 mm in W and 0.7 mm in T was obtained.

Example 3 The same metal bar as that of Example 1 was used for the metal bar. Using this aluminum bar, sandwich the ends (the polyester film thickness of 0.11 mm) of the support on the top side and the ground side with respect to the printing direction of the photosensitive resin printing plate (Shore D: 35 °), And fixed. as a result,
W = 5 which has the same structure as the first embodiment on the top side and the ground side.
5. A printing plate having a tightening bar with a T of 0.7 mm was obtained. Even with this structure, printing could be performed without loosening or coming off during printing.

(Specific Example) The photosensitive resin printing plate with the aluminum fastening bar obtained in Example 1 was attached to a printing machine (Hitachi Seiki RL-1250 type).

A method of attaching the printer to a printing press will be briefly described with reference to FIG.

First, a bank made of a photosensitive resin, which is provided on the top side with respect to the printing direction, is inserted into the insertion portion 1. Then, the top side of the photosensitive resin printing plate is attached. Next, while manually rolling the printing press, the printing operation is performed until the ground side of the photosensitive resin printing plate comes to the front.

Finally, the mounting work is completed by inserting a bank made of an aluminum threaded bar into the slit 2 of the rotary mounting receiver on the ground side of the printing plate and rotating and fixing the bank.

When the printing press equipped with the above-described photosensitive resin printing plate with the aluminum tightening bar was operated, printing was possible for a long time without the plate coming off or loosening from the printing press.

Comparative Example 1 In Example 1, an aluminum plate 0.5 mm × 5 mm × 520 fixed with adhesive tape (3M: ST41b) instead of the aluminum fastening bar was mounted on a printing machine in the same manner as the specific example.
Although there was no problem at the beginning of printing, the plate was loosened with the progress of printing, causing stains in the non-image area, causing a practical problem, and was not usable.

〔The invention's effect〕

The use of the photosensitive resin printing plate with a metal fastening bar according to the present invention makes it possible to easily mount the photosensitive resin printing plate on a printing press, and enables a small printing in a non-printing area to be performed. Eliminates the need for skill. Furthermore, even if the type and characteristics of the photosensitive resin are changed, the problems of durability and durability of the conventional method represented by printing stains due to improper installation of the printing plate or looseness during printing can be solved.

[Brief description of the drawings]

FIG. 1A is a plan view of a general printing plate used for a conventional mounting method. FIG. 1 (B) is a sectional view of the printing plate of FIG. 1 (A). FIG. 2 (A) shows a shape in which there is no bank made of photosensitive resin on the top side and the ground side with respect to the printing direction. FIG. 2 (B) is a cross-sectional view of the printing plate of FIG. 2 (A). FIG. 3A is a perspective view of the metal bar before being fixed to the printing plate. FIG. 3 (B) is a cross-sectional view of the metal bar before fixing when cut at a right angle to the longitudinal direction of the bar. FIG. 4 shows the position of the first printing plate for attaching a metal bar to the printing plate. FIG. 5 shows a state of being fixed at the sharp corner portion by the first winding. FIG. 6 shows a state in which it is further screwed and fixed after FIG. FIG. 7 is a sectional view in which a metal fastening bar is attached to the printing plate. FIG. 8 is an example of a specific sectional view of a plate receiving portion of a plate cylinder of a printing press to which a photosensitive resin printing plate to which a metal fastening bar is attached is mounted.

Claims (2)

(57) [Claims] 1. A metal fastening device comprising a metal plate having an end portion of a support sandwiched and fastened to an end on a ground side with respect to a printing direction of a photosensitive resin printing plate comprising a cured photosensitive resin and a support. Photosensitive resin printing plate with bar attached. 2. A metal plate comprising a metal plate having a support end sandwiched between a top end and a bottom end in a printing direction of a photosensitive resin printing plate comprising a cured photosensitive resin and a support. A photosensitive resin printing plate with a winding bar.