JPH0410064B2 - - Google Patents

Description

Detailed Description of the Invention (Technical Field of the Invention) The present invention relates to a plate-making material for planographic printing or letterpress printing, which is formed by forming a photosensitive layer on a support such as a metal plate or a resin plate. When burning the
This article relates to a method of vacuum-adhering these.

(Prior Art to the Invention) In general, in order to bring a photoengraving original (hereinafter simply referred to as "original") and a photosensitive plate-making material for printing (hereinafter simply referred to as "plate-making material") into close contact for photolithography, printing is required. Place the plate-making material on the frame with the photosensitive resin layer facing upwards, place the original on top of it with the emulsion side facing downward, and then place a glass plate, polyester film, etc. on top of the original. , transparent materials such as polyvinyl chloride films are laminated, and the pressure inside the printing frame is reduced through a vacuum pump from the bottom surface of the printing frame, so that the plate-making material and the document are vacuum-adhered.

(Problems with the Prior Art) However, in this method, an air pocket is formed between the plate-making material and the document, and this air is difficult to escape, resulting in blurred printing. Further, it takes an extremely long time to remove the air pockets, which is not preferable.

Another method is to place the plate-making material and the manuscript in order on the printing frame, and then stack the transparent body on top of it, and then use a squeegee roller to move the plate-making material and the document from one end of the transparent body to the other. A method has also been considered in which the document and the document are sequentially pressed to bring them into close contact under vacuum.

However, in this method, after the original is placed on the plate-making material, a squeegee roller is rolled and scanned from one end of the original to the other, and the original is sequentially pressed against the upper surface of the plate-making material and brought into close contact with suction. To avoid this problem, if the original is placed on the plate-making material and there is air between the plate-making material and the original, the original will be brought into close contact with the surface of the plate-making material with the air being drawn in, causing printing problems. There is a risk that blur may occur partially.

(Object of the Invention) The present invention has been made in view of the problems in the prior art described above, and is a plate-making method that sufficiently brings the plate-making material and the document into close contact with each other, eliminates air pockets between the two, and prevents the occurrence of printing blur. The purpose is to provide a method for bringing materials into close contact with manuscripts.

(Structure of the Invention) In the close contact method according to the present invention, a plate-making material is placed on a printing table, a light-transmitting original is placed on the plate-making material, and then the light-transmitting original is moved from one end to the other end. The structure is such that the squeegee roller is rolled toward the squeegee roller, and during this rolling, the portion of the light-transmissive document immediately in front of the squeegee roller is lifted.

(Example) An example of implementation of the present invention will be described below based on the accompanying drawings. Here, FIG. 1 is a plan view of the printing device used to carry out the method of the present invention, FIG. 2 is a longitudinal sectional view of the printing device viewed from direction A in FIG. 1, and FIG. 2 is a side view seen from direction B in FIG. 1. FIG.

1 in the figure is a baking table, and this baking table 1
Grooves 2 connected to a suction device such as a vacuum pump are formed vertically and horizontally on the top surface, and a squeegee roller 3 is disposed above the printing table 1 in parallel with the top surface of the printing table 1. This squeegee roller 3 is made of an elastic material such as rubber, and its length in the axial direction is slightly shorter than the width of the printing table 1.
It is possible to reciprocate in the horizontal direction (in the figure). Further, a bar 4 made of metal or plastic is attached to the squeegee roller 3. This bar 4 has an intermediate portion 4a that is parallel to the squeegee roller 3 at a position in front of the squeegee roller 3;
Both ends 4b, 4b bent at right angles from a are fixed to the shaft 3a of the squeegee roller 3, and move integrally with the squeegee roller 3.

In order to perform printing in the above process, first, the base end of the light-transmitting original 5, which has longer side lengths on the top, bottom, right and left, than the plate-making material, is placed on the base end of the printing table 1 using pins 6 or adhesive tape. The original 5 is passed through the gap S between the squeegee roller 3 and the bar 4.

Then, the plate-making material 7 is placed on the top surface of the printing table 1 with the photosensitive layer facing upward and the ends of the vacuum suction grooves 2 protruding from the periphery thereof. Thus, the original 5 and the plate-making material 7 are not in contact or in close contact with each other.

Thereafter, the original 5 is placed on the plate-making material 7, and its periphery is made to protrude from the plate-making material 7. Here, a bar 4 is located in front of the squeegee roller 3, and the original 5 is inserted into the gap S between the bar 4 and the squeegee roller 3. Therefore, the original 5 just before the squeegee roller 3 is covered with the plate-making material 7. An air layer 8 is formed between the plate-making material 7 and the original 5 by being lifted from the upper surface.

From this state, the squeegee roller 3 is caused to roll from the base end of the document 5 toward the front end. Then,
Since the groove 2 for vacuum suction protrudes from the periphery of the plate-making material 7, if the vacuum pump is driven,
First, the base end of the original 5 is pressed against the top surface of the printing table 1 and brought into close contact with suction, then the original 5 is pressed into close contact with the top surface of the plate-making material 7, and finally the original 5 is pressed against the top surface of the printing table 1.
The tip of the printing table 1 is brought into close contact with the upper surface of the printing table 1 by suction. In this suction and close contact process, an air layer 8 is formed between the document 5 and the plate-making material 7 just before the squeegee roller 3, and as the squeegee roller 3 rolls, the air layer 8 also moves and is brought into close contact with the document 5 one after another. Even if there is a minute part that is strongly adhered between the plate-making material 7 and the original 5, this part will have to be separated and then pressed again, and there will be a small amount of air between the original 5 and the plate-making material 7. Completely adheres to the entire surface without any remaining layers. In addition, since the edge of the original 5 protruding from the periphery of the plate-making material 7 covers the groove 2, the original 5 is securely attached to the printing table 1 and the plate-making material 7 placed on the printing table 1. Being held in close contact.

After that, exposure is performed from above, and if the photosensitive layer is a negative type, the photosensitive layer of the plate-making material 7 corresponding to the light-transmitting portion of the original 5 is cured, and then the non-exposed portion is eluted to form the desired printing plate. get.

Note that the above is an example of the method of the present invention, and the present invention is not limited to the above example. For example, the squeegee roller has a simple bar shape, but both ends of the squeegee roller have large diameter parts, and these large diameter parts press both ends of the document against the top surface of the printing table when it rolls. It's okay.

Furthermore, there is a method in which a pressing member such as a small roller or a pressing plate is attached to the squeegee roller to press the edge of the document, and the pressure member is approximately equal to the size of the plate-making material at the center of the top surface of the printing table, and its depth is the thickness of the plate-making material. A method of forming a recess approximately equal to the size of the document, and fitting the plate-making material into the recess so that the plate-making material and the top surface of the printing table are flush with each other. It is also possible to use a method in which the plates are pasted together, and this part is pressed against the printing table so as to cover the vacuum suction groove protruding from the periphery of the plate-making material.

In addition, the means for forming and moving the air layer is not limited to bars, but also small rollers made of continuous or intermittent cylinders, and single or multiple linear or plate shaped rollers with regular or irregular shapes. They may be attached to the squeegee roller by directly attaching them to the squeegee roller, or by indirectly attaching one or more rollers to the squeegee roller. As for the landing position, there is no problem as long as it can be placed at both ends of the squeegee roller or only at one end.

(Effects of the Invention) According to the present invention, the close contact between the original and the plate-making material is ensured over the entire surface, which improves the close contact and prevents the occurrence of burnt blur, as well as shortens the vacuuming time. The original can be brought into close contact with the plate-making material, and if the vacuum is released after printing,
It is easier to separate the manuscript from the plate-making material, and since an acrylic plate or cover sheet is not used as in the past, the light for printing is not absorbed by these, making it easier to perform continuous printing. It has many effects such as being able to save time.

[Brief explanation of drawings]

FIG. 1 is a plan view of a printing device for carrying out the contact printing method according to the present invention, and FIG. 2 is a longitudinal cross-sectional view of the printing device as seen from direction A in FIG. 1.
FIG. 3 is a side view of the printing apparatus viewed from direction B in FIG. 1. In the drawing, 1 is a printing table, 2 is a groove for vacuum suction, 3 is a squeegee roller, 4 is a bar that is a lifting member, 5 is a light-transparent original, 7 is a plate-making material, and 8
is an air layer.

Claims (1)

[Claims] 1 Place the plate-making material on the printing table, place the selectively transparent original on top of the plate-making material, and roll the squeegee roller from one end of the document roller to the other end to place the original onto the plate-making material. In the plate-making process in which the original is pressed into close contact with the original, the original is exposed to light from above, and then the soluble portion of the plate-making material is eluted, a lifting member attached to the squeegee roller is used to roll the squeegee roller. A method of bringing a plate-making material and a document into close contact in a plate-making process, characterized in that the squeegee roller is caused to roll while lifting a part of the document immediately in front of the squeegee roller in its advancing direction.