JPH062426B2 - Printing method - Google Patents

Description

The present invention relates to a printing method for printing on a non-printed material such as a glass substrate using a silicon blanket such as an intaglio offset printing method, in which ink from the plate to the silicon blanket is used. The present invention relates to a printing method for improving transferability and for improving the shape of an ink pattern transferred by printing from the blanket to a printing medium.

(Prior Art) After the ink in the intaglio cell pattern is once transferred to a blanket, the blanket is pressed onto a substrate such as glass, and the ink of the blanket is printed and transferred to the substrate. When a solvent with a high affinity is used, the transferred image shape of the ink pattern transferred to the blanket is good, but when an ink containing a solvent with a poor affinity for the blanket is used in the composition, the blanket The image shape of the ink pattern transferred onto the sheet tends to deteriorate. However, when an ink containing a solvent having a good affinity for the blanket is used, the degree of swelling of the blanket by the solvent is large, which adversely affects the print size accuracy. Therefore, when printing an object for which dimensional accuracy is required, it is difficult to use a solvent with good affinity as a single substance. Therefore, even if the transferability to the blanket is slightly deteriorated and the shape of the ink pattern transfer image is deteriorated, a solvent having no affinity for the blanket and having no affinity is blended with the solvent having affinity. Although it was printed, when the solvent is blended in a ratio that prevents swelling, the transferability and the transferred image shape of the ink pattern are considerably deteriorated.

Therefore, it has been desired to suppress swelling of the blanket, to reduce the transferability, and to print favorably without deteriorating the shape of the transferred image.

(Object of the Invention) The present invention is a printing method such as an intaglio offset method using a silicone rubber blanket, in the ink composition,
In order to improve the transferability to the blanket, by adding an appropriate amount of denatured oil type silicone oil, the ink transferability and transfer shape can be markedly and excellently printed, and the swelling of the blanket can be suppressed as much as possible. This is a printing method for printing while maintaining dimensional accuracy.

(Structure of the Invention) The present invention is a printing method such as intaglio offset printing in which a transfer blanket made of silicon rubber is used for printing using a printing ink in which a very small amount of varnished modified silicone oil is added to the ink. This is a printing method characterized by the above.

The method of the present invention will be described in detail according to one embodiment. When a silicone rubber blanket is used to form an ink pattern of a desired film thickness on a glass substrate by intaglio offset printing, the composition of the printing ink used. Is, for example, epoxy resin varnish or polyimide resin varnish resin varnish as a vehicle, and ethyl carbitol and 2-
The main ink solvent is a mixed solvent with butoxyethanol or N-methyl-2-pyrrolidone (NMP). All of these ink solvents have a low affinity for a silicon blanket, and the swelling of the blanket. I don't have to worry. Therefore, in the present invention, there is no swelling property for such a blanket, however, in order to enhance the transferability in a solvent that reduces the transferability to the blanket, for example, as a modified oil-based silicone oil,
YF3910, YF3860, YF3953 (manufactured by Toshiba Silicone Co., Ltd.), or X-50-525, KS
604, KS600, X-50-562H (manufactured by Shin-Etsu Chemical Co., Ltd.), or L-7002, L-7500,
It is desirable to add one of L-7604 (manufactured by Nippon Unicar Co., Ltd.) to 0.1 to 1.0% by weight of the non-swelling solvent.

However, the present invention is not limited to this and may be added to the extent that the printability as a printing ink (for example, suitability on a printing machine) is not deteriorated.

(Effect of the Invention) According to the present invention, a non-swelling property for a silicon blanket is imparted by adding a small amount of silicone oil to a printing ink whose main ink solvent is a solvent that does not swell for a silicon blanket. As it was, it was discovered that the transferability of the printing ink can be enhanced extremely strongly, and this phenomenon was established as a printing method. Therefore, addition of a small amount of silicone oil is sufficient,
Little change in viscosity, thixotropy, etc. of printing ink,
Since the quality of the printing ink is not changed, it is possible to use the printing ink with peace of mind without adversely affecting the shape of the transferred image and the reproduction of the printed image. Moreover, by adding silicone oil, even when a solvent having a little bad affinity for the silicone rubber blanket is used for diluting the printing ink, the transferability does not deteriorate relatively and the conventional transfer shape is maintained. can get. When silicone oil is added to the ink, the edge of the image transferred to the blanket does not have a sawtooth shape different from the cell pattern image part of the intaglio, and the transfer rate of the image to the blanket and the The transfer shape is improved, and the printing plate image area can be reproduced well. Further, even if the ink composition blending ratio of the ink solvent in which the swelling of the silicon blanket is suppressed in order to improve the printing reproduction accuracy such as the printing size, the transferability of the printing ink is not relatively deteriorated.

(Effects of the Invention) The present invention uses an ink containing a volatile solvent that suppresses swelling of a blanket as a main ink solvent in a printing ink when printing on a paper substrate, a glass substrate or the like using a silicone rubber blanket. Then, it is necessary to print while maintaining the dimensional accuracy. In such a case,
It is an excellent printing method that can improve the transferability of printing ink to the blanket by adding a small amount of silicone oil, and has a remarkable effect on printing methods that use a silicon blanket as a transfer material, such as the intaglio offset printing method. It is a printing method that can be demonstrated.

Specific examples of the present invention will be shown below.

<Example 1> Ink composition Weight ratio Ink pigment 19.9 parts Epoxy varnish # 1010 40 〃 Ink solvent; Ethyl carbitol 40.1 〃 Silicon oil; YF3910 (manufactured by Toshiba Silicone Co., Ltd.) 0.4 〃 Then, it was made into ink and was printed on a glass substrate with an intaglio offset printing machine using a silicon blanket, and it was possible to reproduce a printed image with good transferability and dimensional accuracy.

<Example 2> Ink composition Weight ratio Ink pigment 18 parts Epoxy varnish # 1007 42〃 Ink solvent; Ethylcarbitol 32〃 2-Butoxyethanol 8〃 Silicon oil; YF3910 (Toshiba Silicone Co., Ltd.) 0.4〃 Was kneaded to form an ink, and printing was carried out in the same manner as in Example 1. As a result, reproduction of a printed image with good transferability and dimensional accuracy was obtained.

<Example 3> Ink composition Weight ratio Ink pigment 20.8 parts Polyimide resin varnish 13.9 "Ink solvent; N-methyl 2-pyrrolidone (NMP) 65.3" Silicon oil; KS604 (Shin-Etsu Chemical Co., Ltd.) ) When 0.4 〃 was kneaded to form an ink and printing was carried out in the same manner as in Example 1, reproduction of a printed image with good transferability and dimensional accuracy was obtained.

Claims (3)

[Claims] 1. In a printing method such as intaglio offset printing in which a transfer blanket made of silicon rubber is used for printing, a varnished modified oil is added to an ink whose main ink solvent is a solvent having a low chemical affinity to the blanket. A printing method characterized by printing using a printing ink to which a trace amount of silicone oil has been added. 2. The method according to claim 1, wherein the silicone oil is added in an amount of 0.1 to 1.0% by weight based on the main ink solvent. 3. The method according to claim 1, wherein the printing ink comprises at least a pigment, an epoxy varnish or a polyimide varnish, a main ink solvent and a trace amount of a modified oil type silicone oil.