JPS63279257A - Production of intaglio printing plate for pad printing - Google Patents

Abstract

PURPOSE:To eliminate the need for a positive film for plate making by forming a printing pattern consisting of a light shieldable coated film directly on the surface of the photosensitive layer of an intaglio printing material. CONSTITUTION:A plate material formed by laminating an adhesive layer 12, an ink receptive layer 13 and a photosensitive layer 14 successively on a base plate 11 is used for the photosensitive intaglio printing material 10. The printing pattern 15 consisting of the light shieldable coated film is directly formed on the surface of the photosensitive layer 14 and UV rays are projected thereto to cure the photosensitive layer 14 except the part 14' shielded by the coated film 15'; thereafter, the coated film 15' and the part 14' are removed and the material is subjected to drying and post-exposing process to form the intaglio printing plate 16 corresponding to the pattern 15. This pattern 15 is preferably formed by a thermal transfer printer using an ink ribbon or transfer sheet of a press transfer type or by hand drawing.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method for manufacturing an intaglio plate used in pad printing.

(Prior art) The pad printing method, which is used to print a predetermined pattern consisting of letters, figures, etc. on various articles such as resin molded products, is a process in which ink is applied to an intaglio plate on which the above pattern is engraved. The ink is held in the pocket, and the ink forming the pattern is transferred to the pad by pressing a flexible transfer pad made of silicone rubber or the like onto the pocket, and then the pad is pressed against the printing material to transfer the ink to the printing material. This is a method of printing the above-mentioned pattern on a printed matter, and the intaglio plate used in this printing method has conventionally been manufactured as follows.

That is, as shown in FIG. 7(a), first, a plate-shaped photosensitive intaglio material 1 is formed by providing a photosensitive layer 1b on a substrate la, and a predetermined printing pattern 2b is displayed on the back side of a transparent film 2a. A so-called back positive film 2 is prepared. Next, as shown in FIG. 7(b), the photosensitive layer 1 of the intaglio material 1 is
By exposing these with the positive film 2 superimposed on the photosensitive layer 1b, the portion 1b' of the photosensitive layer 1b that is not shielded from light by the printed pattern 2b is cured, and the positive film 2 is then removed. In step 2, the uncured portion (portion blocked by the printed pattern 2b) lb'' of the photosensitive layer 1b is washed away with a solvent such as water or alcohol, and the required drying and post-exposure treatments are carried out. As shown in (c), an intaglio plate 3 is obtained in which a portion of the positive film 2 corresponding to the printing pattern 2b is intaglio-engraved to form an ink pocket 3a.

(Problems to be Solved by the Invention) Incidentally, in such an intaglio manufacturing method, as described above, it is first necessary to create a positive film. This positive film is obtained by photographing a pre-prepared block and then completing the film into a positive back through a prescribed development process. Therefore, the production of the positive film requires considerable effort and cost. To solve this problem, it may be possible to hand-draw a printed pattern on a transparent film using light-shielding ink, but in this case, as shown in FIG. 8(a),
A positive film 2' is obtained in which a printed pattern 2b' is displayed on the front side of a base film 2a'. However, when such a positive film 2' is used, as shown in the figure, during exposure, the sensitizing light ray a enters below the printed pattern 2b' due to the thickness of the base film 2a'. As a result, the boundary between the hardened portion and the unhardened portion of the photosensitive layer 1b in the concave plate material 1 becomes unclear, resulting in ink pockets 3a as shown in FIG. 8(b).
The intaglio plate 3' has irregular and inaccurate contour lines, and if such an intaglio plate 3' is used, a clear print finish cannot be obtained.

The present invention has been made in view of the above-mentioned circumstances regarding the production of intaglio plates for pad printing, and provides a method for producing this type of intaglio plates with clear ink pocket outlines without using a positive film. The purpose is to realize the following.

(Means for Solving the Problems) In order to achieve the above object, the method for manufacturing an intaglio plate for pad printing according to the present invention is characterized in that it is configured as follows.

First, a plate-shaped photosensitive intaglio material having a photosensitive layer provided on a substrate is prepared, and a printing pattern is directly displayed on the surface of the photosensitive layer in the intaglio material using a light-shielding coating film. After exposing this to light, the coating film displaying the printed pattern is removed from the surface of the photosensitive layer, and the photosensitive layer is subjected to a development process, followed by necessary post-processing, such as drying process and post-exposure process. In that case, methods for displaying the printed pattern on the photosensitive layer using the light-shielding coating include a method using a thermal transfer printer, and instant lettering in which a predetermined transfer pattern is printed on a base film in advance. It is possible to use a method using a pressure transfer type transfer sheet, which is also called a "transfer sheet," or a method of hand-drawing using a liquid such as ink or black ink that has the required light-shielding properties. Any method may be used as long as it can directly display a printed pattern on the surface of the photosensitive layer of the intaglio material using a light-shielding coating.

(Function) According to the above configuration, after displaying a printing pattern on the surface of the photosensitive layer of the intaglio material with a light-shielding coating film, this is exposed to light so that the photosensitive layer removes the display area of the printed pattern. Therefore, by removing the coating film and developing the photosensitive layer, the uncured area, that is, the area where the printed pattern was displayed, will be washed away. Then, by performing necessary post-processing such as drying and post-exposure, an intaglio plate in which ink pockets constituting the printing pattern are engraved is obtained.

In particular, according to the method of the present invention, since the printing pattern is directly displayed on the surface of the photosensitive layer of the intaglio material, there is no need for a positive film, and the photosensitive layer is precisely exposed or cured according to the pattern. Therefore, an intaglio plate with clear ink pocket outlines can be obtained.

(Example) Examples of the present invention will be described below.

In this example, as a photosensitive intaglio material, a commercially available intaglio material is used, in which an adhesive layer 12, an ink receiving layer 13, and a photosensitive layer 14 are sequentially laminated on a synthetic resin substrate 11, as shown in FIG. Photosensitive intaglio material 10 (trade name: PG plate, manufactured by Toshi Co., Ltd.) was used.

The ink receiving layer 13 forms the bottom surface of the ink pocket in the completed intaglio plate, and improves the retention of ink within the pocket.

Then, as shown in FIG. 2, a printed pattern 15 consisting of predetermined characters, etc. is directly printed on the surface of the photosensitive layer 14 of this intaglio material 10 using a thermal transfer printer widely used in word processors, personal computers, etc. displayed. This printer uses an ink ribbon with a transfer ink layer provided on a base film, and only the portions of the ink layer that constitute the desired characters are heated and transferred onto the printing material. By using this, a light-shielding coating film 15' depicting the printed pattern 15 is formed on the surface of the photosensitive layer 14 of the intaglio material 10.

In this case, if an intaglio material 10 having a total thickness of about 0.2 mm is used, it is possible to fully install the intaglio material 10 in the printer as described above.

Next, as shown in FIG. 3, the intaglio material 10 on which the printed pattern 15 was displayed on the surface of the photosensitive layer 14 was exposed to light using an ultraviolet irradiation device. In that case, the exposure time is
4. It varies depending on the material, thickness, strength of ultraviolet rays, etc.
In this example, the duration was 1 to several minutes. By this exposure treatment, the photosensitive layer 14 is cured except for the portion 14' that is shielded from light by the coating film 15' constituting the printed pattern 15.

Further, after this exposure treatment, the coating film 15' was removed using a thinner solvent, and then a development treatment was performed using an alcohol developer. As a result, as shown in FIG. 4, the uncured portion 14' of the photosensitive layer 14, that is, the portion that was shielded from light by the coating wA15' (printed pattern 15) during the exposure process, is washed away and is hardened by the exposure process. Only the portion 14'' that is covered with the substrate 11 (ink receiving layer 1)
3) A concave groove remained on top and had a shape corresponding to the printed pattern 15 shown in FIG. 2.

Thereafter, this intaglio material 10 was dried with warm air at 50 to 70° C. for 5 to 10 minutes, and further subjected to post-exposure treatment using ultraviolet rays for 5 to 10 minutes.

As a result, as shown in FIG.
6 was obtained.

In this embodiment, as a method for directly displaying a printing pattern on the surface of the photosensitive layer 14 of the intaglio material 10 with a light-shielding coating film, a commercially available transfer sheet 20 for instant lettering as shown in FIG. 5 is used. used. This transfer sheet 20, like a conventional positive film, has a transfer layer 22 on the back side of a transparent base film 21 on which characters, etc. are drawn in the correct arrangement when viewed from the front side, and furthermore, the transfer layer 22 An adhesive layer (not shown) is provided on the lower surface of the transfer layer 22, and by bringing the adhesive layer into contact with the surface to be transferred and applying pressure from the front side, the transfer layer 22 is transferred to the surface to be transferred. This is what has come to be done. Then, using this transfer sheet 20, the transfer layer 22 is transferred to the photosensitive layer 14 in the intaglio material 10.
A coating film 15'' constituting the printed pattern was formed by transferring the coating onto the surface of the printed pattern.

After performing the same exposure process as in the first embodiment,
In this example, the coating film 15'' was removed by pasting an adhesive tape onto the coating film 15'' and then peeling it off. Thereafter, the same developing treatment, drying treatment, and post-exposure treatment as in the first example were performed to obtain an intaglio plate similar to that in the first example.

In this embodiment, as shown in FIG. 6, the surface of the photosensitive layer 14 of the intaglio material 10 is coated with opaque ink, which is generally used for correcting images on films, to form a printing pattern. A film 15- was formed. Here, the coating film 15~ may be formed with the ink by using a normal brush or ben, but since so-called sign bene or brush bene type ones are commercially available, these may also be used. Thereafter, the same exposure treatment, coating fi15- removal treatment, development treatment, drying treatment, and post-exposure treatment as in the first example were performed to obtain a similar intaglio plate. In particular, in this embodiment, since the printed pattern is displayed by hand-drawing, any arbitrary or original pattern can be adopted as the pattern.

In the above embodiments, the substrate 11 made of synthetic resin was used as the intaglio material 10, but in the second embodiment, the thickness is not a problem. In the third embodiment, an intaglio material whose substrate is made of metal can be used. Further, although the above-mentioned intaglio material 10 is of an alcohol-developable type, it is of course possible to use a water-developable type intaglio material, and in this case, in the development process after exposure, the uncured portion of the photosensitive layer is It will be washed away.

(Effects of the Invention) As described above, according to the present invention, when producing an intaglio plate for pad printing using a photosensitive intaglio material, a printing pattern is directly displayed on the surface of the photosensitive layer in the intaglio material using a light-shielding coating film. This eliminates the need to use a positive film that requires specific steps and equipment to produce, as was the case in the past.

As a result, this type of intaglio plate can be produced extremely easily and inexpensively, and the degree of freedom in selecting printing patterns is expanded, thereby contributing to the spread of pad printing.

[Brief explanation of drawings]

Figures 1 to 4 show a first embodiment of the method of the present invention. Figure 1 is an enlarged sectional view of an intaglio material used in this embodiment, and Figure 2 shows a pattern printed on the surface of the intaglio material (photosensitive layer). FIG. 3 is an enlarged sectional view of the intaglio material showing the exposure process, and FIG. 4 is an enlarged sectional view of the completed intaglio plate. FIG. 5 shows a second embodiment of the method of the present invention, and is an enlarged sectional view showing a state in which a printing pattern is transferred from a transfer sheet to the surface of an intaglio material, and FIG. 6 shows a third embodiment of the method of the present invention. This is an example, and is a perspective view showing a state in which a printing pattern is hand-drawn on the surface of an intaglio material. In addition, Fig. 7(a) to (
c) shows a conventional example of the intaglio manufacturing method;
is a perspective view showing an intaglio material and a positive film, FIG.
(c) is an enlarged sectional view showing the exposure process and the finished product, respectively. Furthermore, FIGS. 8(a) and 8(b) are enlarged cross-sectional views showing the exposure process and the finished product, respectively, when a front-positive positive film is used as a conventional problem. 10... Photosensitive intaglio material, 11... Substrate, 14...
Photosensitive layer, 15...Print pattern, 15', 15'', 1
5'''... Paint film, 16... Intaglio, 16a... Ink pocket. 2nd place 3rd FA Figure 5 Figure 6tA Figure 7(b) Figure 8

Claims (4)

[Claims] (1) A method for manufacturing an intaglio plate for pad printing using a photosensitive concave plate material having a photosensitive layer provided on a substrate, in which a printing pattern is first directly applied to the surface of the photosensitive layer of the concave plate material using a light-shielding coating film. This is then exposed to light to cure the non-displayed areas of the printed pattern in the photosensitive layer, and the coating film displaying the pattern is removed, and then the non-cured areas of the photosensitive layer are washed away by a development process. A method for producing an intaglio plate for pad printing, which comprises performing necessary post-processing. (2) The method for manufacturing an intaglio plate for pad printing according to claim 1, wherein the printing pattern is displayed on the surface of the photosensitive layer of the intaglio material by a thermal transfer printer. (3) A patent claim characterized in that the printing pattern is displayed on the surface of the photosensitive layer in the intaglio material using a pressure transfer type transfer sheet in which the printing pattern is printed on a base film in advance. A method for producing an intaglio plate for pad printing according to item 1. (4) The method for producing an intaglio plate for pad printing according to claim 1, wherein the printing pattern is displayed on the photosensitive layer of the intaglio material by hand-drawing using a liquid having light-shielding properties. .