JPS63115155A - Method for contacting vacuum contact printer - Google Patents

Abstract

PURPOSE:To eliminate a print blur without changing a printer by sticking the reverse surface side of a film negative plate on a light transmissive auxiliary sheet and sealing the air layer between the auxiliary sheet and film negative plate, and obtaining a sheet negative plate. CONSTITUTION:The film negative plate 32 is stuck on the light transmissive auxiliary sheet 40 made of one thin plate sheet 40a by using an adhesive tape 38 so that the entire periphery is held airtight, thus forming the sheet negative plate 6. This is loaded in the printer and the air between a photosensitive holder and the light transmissive plate is discharged to cause the pressure in the air layer 41 between the auxiliary sheet 40 and film negative plate 32 to rise relatively, so that the entire surface of the film negative plate 32 is pressed strongly against the photosensitive material. Therefore, even if there is another film negative plate 34 cut and stuck on the film negative plate 32, it is brought into contact nearly perfectly and no print blur is generated. In another way, two thin plate sheets are stuck while having an air layer left and the film negative plate 32 is stuck thereupon to form the sheet negative plate.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a method of adhesion in a vacuum contact printing machine such as a manual or automatic printing machine or a copying machine in the field of photoplate technology. be.

<Prior art> Generally, the basic structure of a vacuum contact printing machine is a photosensitive film, a 28 plate, or a substrate having a photosensitive layer (
a photosensitive material holder on which a photosensitive material (hereinafter simply referred to as photosensitive material) is placed;
A light source for exposure, a transparent plate that transmits the irradiated light, a bank member that seals the space between the facing surfaces of the photosensitive material holder and the transparent plate, and an exhaust port that faces into this sealed space. A film original plate, which is a transparent original film, and a photosensitive material are aligned and set with each other between the facing surfaces of a photosensitive material holder and a light-transmitting plate, and a bank member is attached to the light-transmitting plate on the photosensitive material holder. to form a sealed space containing the film original plate and the photosensitive material, and to bring the film original plate and the photosensitive material into close contact by exhausting the air in the sealed space from the exhaust port,
It is configured to be exposed to light through a transparent plate.

However, in this type of vacuum contact printing machine, a phenomenon called printing blur, in which the sharpness of the printed image locally deteriorates, often occurs.

This is because there is a local adhesion failure between the film original plate and the photosensitive material, and various aspects of this adhesion failure can be considered. Next, some examples will be explained using figures.

FIG. 7 is a cross-sectional view of a main part showing the state in which a pasted original plate and a photosensitive material are in close contact with each other in a conventional vacuum contact printing machine.
are appropriately laid out and pasted on the auxiliary sheet 30 and used as a pasting original plate.

This figure shows the state in which the original plate boulder 14 of the plate printing machine is placed on the photosensitive material 4, but if there is another film original plate 34 cut and pasted on the film side of the film original plate 32, the film Burning blur occurs due to the step portion caused by the original plate 34. In addition, as shown in FIG. 8, when the original plate holder 14 shown in FIG. 7 is placed across the end of the 28-plate 4 and facing each other, and in this state the i inlet 24a is evacuated and brought into close contact, the original plate holder 14 shown in FIG. Due to the curvature of the plate 18, a gap between the film base plate 32 and the 28th plate 4 causes a burnout blur, and in addition to these, in the case of a photosensitive substrate, a wide variety of other problems occur, such as a burnout blur due to unevenness on the surface of the substrate. A burnt blur appears.

Therefore, as a technique for solving this problem of poor adhesion, for example, the technique shown in FIG. 9 has been known (Japanese Utility Model Publication No. 56-18934). It is a photosensitive substrate 1
Film original plates 132 and 132 are placed on both the upper and lower sides of 04, respectively.
This relates to a vacuum close-contact printing machine that aligns and prints the two parts.In short, in the basic structure,
A translucent mylar sheet 130 is interposed between the translucent plate 118 and the original film plate 132, and the translucent plate 11
A compressed air injection chamber 141 for pressurizing air is formed between 8 and the mylar sheet 130, and this compressed air injection chamber 141
The air pressurized into the film presses the film original plate 132 against the photosensitive substrate 104 through the mylar seams 130, while the air in the sealed space 119 is exhausted from the exhaust port 124, thereby eliminating local adhesion defects. It was designed to eliminate the

In FIG. 9, reference numeral 120 is a rubber bank, 123 is an injection port for injecting air into the compressed air injection chamber 141, and 125 is a stopper for closing the upper and lower frames 101 and 102.

<Problems to be Solved by the Invention> However, although the above-mentioned conventional example can eliminate the burning blur, air is pressurized into the compressed air injection chamber 141, and the compressed air for this purpose is Since a power source is required, the structure becomes complicated and the cost of the entire device increases. Moreover, since the air press-in process is extra compared to the previous one, productivity is reduced.

The present invention has been made in view of the above circumstances, and an object of the present invention is to eliminate the above-mentioned burnout blur without increasing the cost of the device or reducing productivity.

<Means for Solving the Problems> The adhesion method according to the present invention can be applied as is to the vacuum adhesion printing machine having the above-mentioned basic structure without modification or other changes, and is configured as follows.

That is, the photosensitive material and the film original plate are mutually aligned and placed between the opposing surfaces of the photosensitive material holder and the transparent plate of the vacuum contact printing machine, and the space between the opposing surfaces is sealed via the bank member. However, in the adhesion method of the vacuum contact printing machine, in which the photosensitive material and the film original plate are brought into close contact by exhausting the air in the airtight space through the exhaust port facing into the airtight space, the back side of the film original plate is It is characterized in that it is attached to a larger size translucent auxiliary sheet, and an air layer is formed in a sealed manner at least between the translucent auxiliary sheet and the original film.

<Function> According to the present invention, a plane sealed air layer is formed between at least the light-transmitting auxiliary sheet and the film original plate, and the air space in the sealed space between the light-sensitive material holder and the light-transmitting plate is formed. When the air is evacuated, the air pressure within the air layer becomes relatively high. Due to this relatively high air pressure, the entire surface of the film original plate is strongly pressed against the photosensitive material, and the two are brought into complete contact with each other without any gap between the facing surfaces. In addition,
This air layer is formed when attaching the original film to the translucent auxiliary sheet, or by pre-sealing it inside the translucent auxiliary sheet, and the vacuum contact printing machine itself does not require any modifications or functional changes. , without changing the operating procedure.

<Example> An example in which the present invention is applied to an automatic plate printing machine will be described below.

FIG. 6 is a perspective view of the tilt type automatic plate printing machine. This reprint edition 8
! 1 is an inclined base table 2 and this base table 2
A horizontally movable pedestal 11 is installed to be movable in the left and right (arrow X) directions above, a vertically movable pedestal 12 is installed on the left and right movable pedestal 11 so as to be movable in the vertical (arrow Y) direction, and this vertically movable pedestal 12 Original plate holder 14 and light source 16 equipped with
It consists of:

The base table 2 is provided with a photosensitive material holder 3 for adsorbing and holding a photosensitive material 4 such as a 28 plate on the front right side, and a discharge section 10 and a supply section 8 for sheet originals 6 on the upper and lower left sides.

A negative set of pins 42, 42 are implanted in the sheet original plate supply section 8, and these pins 42, 42 are inserted into the bottle holes drilled in the sheet original plate 6 to prepare the required number of sheet original plates 6 for mounting in advance. It is supposed to be kept.

As shown in FIG. 2, the sheet original plate 6 consists of a film original plate 32 and a light-transmitting auxiliary material 40 which is larger in size than the film original plate 32 and is attached to the back side of the film original plate 32 with adhesive tape or the like. Become. And this translucent auxiliary sheet 4
0 consists of two transparent sheets 40a and 40b, and the peripheral edges (outside the dotted line in the figure) of these two transparent sheets 40a and 40b are pasted with adhesive to form a transparent sheet. An air layer 41 is formed between the translucent sheets 140m and 406 in the optical auxiliary sheet 40 (the region inside the dotted line in the figure).

However, since these two translucent sheets 40a and 40b are in close contact with each other on almost the entire surface, the air layer 41 cannot be easily seen under normal conditions, but there is never a vacuum state between the two sheets. I haven't. In FIG. 2, the reference numeral 34 is a film original plate further attached to the upper surface of the film original plate 32, and the reference numerals 44 and 44 are bottle holes bored corresponding to the pins 42 and 42.

The sheet original plate 6 prepared in advance in this way is loaded into the supply unit 8 with the film original plate 32 facing downward, that is, with the image surface facing downward. It consists of a surface and an image film surface, but during contact printing, the image film surface is usually attached to the auxiliary sheet so as to face the photosensitive material surface6.The original plate holder 14 is as shown in FIG. , a frame 17 provided on the lower side of the vertically movable pedestal 12, a transparent plate 18 such as a glass plate fixed to the lower surface of the frame 17, and a laminate so as to surround the peripheral edge of the transparent plate 18. an airtight bank 20,
A transparent plate 18 surrounds the inner opening of the frame 17.
A suction groove 26 for holding the sheet original plate cut on the lower surface of the
It consists of an exhaust connection pipe 22 provided in communication with the suction groove 26, and an exhaust connection pipe 24 provided with an exhaust port 24a facing into the inner space 19 surrounded by the rubber bank 20. It is configured to be capable of descending into contact with and rising away from the upper surface of the base table 2 by means of a driving means.

The printing operation of this device will be explained below.

First, the horizontally movable pedestal 11 and the vertically movable pedestal 12 are respectively moved to place the original sheet holder 14 on the sheet original 6 of the supply unit 8.
Position the camera facing the camera. Next, the original plate holder 14 is lowered toward the base table surface, and as shown in FIG.
6, the original sheet plate 6 is held on the lower surface of the transparent plate 18 by suctioning the peripheral portion of the original sheet plate 6 on the transparent plate side.

The left/right movable pedestal 11 and the vertically movable pedestal 12 are moved again to position the original plate holder 14 at a desired position facing the photosensitive material 4 held by the photosensitive material holder 3.
As shown in the figure, the original plate holder 14 is brought into contact with the photosensitive material 4 held by the photosensitive material holder 3 via the rubber bank 20, and a space 19 surrounded by the transparent plate 18, the photosensitive material 4, and the rubber bank 20
Seal it tightly. Thereafter, the air in this closed space 19 is evacuated through the exhaust port 24m.

Then, as described above, an air layer 41 is formed in the transparent auxiliary sheet 40 of the sheet original plate 6 in a sealed manner.
The air pressure within this air layer 41 becomes relatively high. This relatively high air pressure presses the film original plate 32 strongly against the photosensitive material, and even in the step part created by the cut and pasted original plate 34 on the film side of the film original plate 32, there is no gap left large enough to cause burnout, and the film is The original plate 32 and the photosensitive material 4 are almost completely in contact with each other.

In addition, as shown in FIG. 4, when contact printing is performed over the edge of a relatively thick 28 plate 4, the transparent plate 1 is
8 is a film original plate 32 which is curved by the edge of the 18th plate.
does not lie along the transparent plate 18, but instead forms the air layer 41 in the same manner as described above.
It is strongly pressed against the photosensitive material 4 by the air pressure inside and completely adheres to it.

Next, the light source 16 is turned on and exposed. When the exposure is completed, evacuation is stopped, the sealed space 19 is vented to the atmosphere, and the original plate holder 14 is lifted and separated from the surface of the photosensitive material. Afterwards, the original plate holder 14 is sequentially moved to a desired position and the printing is performed in the same manner. When the printing of the entire surface of the photosensitive material 4 is completed, the original plate holder 14 is moved to the discharge section 10 and receives the sheet original plate 6. is discharged to member 10a. This completes the series of chain plate burning operations.

Here, in place of the adhesive used for the above-mentioned auxiliary sheet, a commercially available double-sided adhesive tape could be simply used to obtain exactly the same adhesion effect.

In this case, in a vacuum-adhesive state, a very small amount of air leaks from the sealed air layer as well as the adhesion effect due to the pressure difference with the vacuum part, but the amount is small, at least until the end of the exposure process. The effect is maintained.

Therefore, the sealed state of the air layer in the present invention is not necessarily limited to a sealed state in which no leakage occurs, but also includes the above-mentioned sealed state.

FIG. 5 shows another embodiment of the sheet original plate 6, in which a film original plate 32 is adhered to a light-transmitting auxiliary sheet 40 made of one thin sheet 40a with an adhesive tape 38 over its entire circumference. , a transparent auxiliary sheet 40 and a film original plate 32
An air layer 41 is formed between the two.

Even in this case, the air layer 41 acts in the same manner as described above, and the film original plate 32 is covered with the photosensitive material 4 over the entire surface.
completely adhered to.

In the above embodiment, the present invention was applied to an automatic plate printing machine, but the present invention is not limited to this, but can be applied to any vacuum contact printing machine having the basic structure described above.

<Effects of the Invention> As is clear from the above explanation, according to the adhesion method of the present invention, the base side of the film original plate can be adhered to a permeability auxiliary sheet of a larger size than that, and at least the transparent auxiliary sheet Since an air layer is formed in a sealed manner between the auxiliary sheet and the film original plate, simply by evacuating the airtight space between the photosensitive material holder and the light-transmitting plate, the air pressure within this air layer can be adjusted to a relative level. The final step is to press the original film onto the photosensitive material over its entire surface and bring it into complete contact.

As a result, there is no need to modify the vacuum contact printing machine itself, change its functions, or change its operating procedures, so it is possible to eliminate printing blur without increasing the cost of the device, making it easy to fabricate it, or reducing its functionality. It can be resolved.

[Brief explanation of the drawing]

Figures 1 to 6 show an embodiment in which the present invention is applied to an automatic plate printing machine. Figure 1 shows an example in which the original plate holder is brought into contact with the photosensitive material holder to bring the film original plate and the photosensitive material into close contact. 2 is a perspective view showing one embodiment of the sheet original plate; FIG. 3 is a longitudinal sectional view of the main part showing the original sheet holder holding the sheet original plate shown in FIG. 2 by suction; FIG. 4 is a view equivalent to FIG. 1 showing another close contact state, FIG. 5 is a perspective view showing another embodiment of the sheet original plate, FIG. 6 is a perspective view of an inclined automatic plate printing machine,
FIGS. 7 and 8 are longitudinal sectional views of essential parts showing aspects of poor adhesion due to conventional adhesion directions, respectively, and FIG. 9 is a longitudinal sectional view of a vacuum contact printing machine showing a conventional example. 1... Vacuum contact printing machine (automatic plate printing machine), 3... Sensitive material holder, 4... Light sensitive material, 6... Sheet original plate, 14... Original plate holder, 18... Translucent Board, 19... Closed space, 20... Bank member (rubber bank), 24m... Exhaust port, 32... Film original plate, 34... Cut and paste original plate, 40, 40a, 40b
... Translucent auxiliary sheet, 41... Air layer. Patent applicant Dainippon Screen Manufacturing Co., Ltd. Agent
Person Hisashi Kitaya - Figure 2

Claims (1)

[Claims] 1. A photosensitive material and a film original plate are mutually aligned and placed between the opposing surfaces of a photosensitive material holder and a transparent plate of a vacuum contact printing machine, and the space between the opposing surfaces is closed. In a method for a vacuum contact printing machine, in which a photosensitive material and a film original plate are brought into close contact with each other by sealing the space through a bank member and exhausting air from the space through an exhaust port facing into the space, Vacuum adhesion characterized in that the back side of the film base plate is adhered to a larger sized translucent auxiliary sheet, and an air layer is formed in a sealed manner between at least the translucent auxiliary sheet and the film base plate. Adhesion method 2 for a printing machine, the light-transmitting auxiliary sheet is composed of at least two thin sheets, and the peripheries of the two thin sheets are adhered to form an air layer within the light-transmitting auxiliary sheet. The contact method of the vacuum contact baking machine described in Scope 1