JP3368356B2 - Printing method - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a printing method applicable to tampon printing . [0002] Tampon printing (pad printing or octopus printing )
Printing) , a printing method called “double printing” may be performed in order to increase the thickness of the ink formed on the printing medium. In this printing method, a printing original plate and a printing material are arranged side by side, and a tampon (pattern) is used.
In the printing method of transferring the characters or figures of the printing original plate to the printing substrate by sequentially contacting the printing plate and the printing substrate with the printing plate, the same operation is repeated twice. As a result, the ink adheres to the substrate twice, so that the thickness of the ink increases. [0003] Conventionally performed by tampon printing 2
The degree printing will be described with reference to the drawings. In FIG. 2, reference numeral 1 denotes a printing machine, which is formed of a lower base 2, an upright portion 3, and an upper base 4 and has a U-shape when viewed from the side. On the lower base 2 of the printing press 1, a printing original plate 5 and a printing material 6 are provided side by side, and are fixed by fixing means (not shown). Reference numeral 7 denotes a blade called a doctor, which scrapes unnecessary ink covering the printing original plate 5, and reference numeral 8 denotes a plate called a spatula which covers the printing original plate 5 with ink. A tampon 9 is provided on the upper base 4 of the printing press 1. The tampon 9 has both moderate hygroscopicity and elasticity. The tampon 9 is pressed against the printing original plate 5 to absorb the ink applied to the printing original plate 5 and then pressed against the printing material 6 as described later. Then, printing is performed by transferring the ink to the printing substrate 6. As described above, the tampon 9 is in contact with both the printing original plate 5 and the printing substrate 6, and is provided with a mechanism provided inside the upper base 4, in the longitudinal direction (horizontal direction) of the upper base 4 and the height of the standing portion 3. It can move in the direction (vertical direction). A conventional printing method using the printing press 1 having such a configuration is performed in the order shown in FIG. In these figures, illustration of the spatula 8 is omitted. First, in the doctor ring A, the tampon 9 located near the tip of the upper base 4 and at the ascending position moves in the direction of the printing original plate 5 as indicated by an arrow. Next, in the step indicated by B, the tampon 9 that has reached above the printing original plate 5 falls on the printing original plate 5 and presses against the printing original plate 5. The tampon 9 having absorbed the ink from the printing original plate 5 ascends in the step C and moves to the printing position in the subsequent step D. In the step E, the tampon 9 descends, and the first printing for transferring the ink to the printing material 6 is performed.
In addition, doctor ring means that the character design is
If the ink has been etched ,
The patcher 8 supplies ink to the printing original plate 5 and the doctor 7
Refers to a series of operations in which ink is scraped away from portions other than the etched portions and ink is left only in the etched portions. [0007] The tampon 9 after the first printing is F
And moves toward the printing original plate 5 in the G doctoring step. Hereinafter, the steps indicated by H to L are exactly the same as the steps indicated by A to F, and the second printing is performed in the step of K. In other words, in this printing method, the tampon 8 reciprocates twice between the same printing original plate 5 and the printing material 6, and performs printing on the printing material 6 twice. By performing overprinting twice in this manner, a predetermined film thickness is formed on the printing material 6.
The first printing position may be slightly shifted from the first printing position. In conventional tampon printing, the film thickness obtained by one printing has been 3 to 4 microns. Because of such a thin film thickness, it was not possible to sufficiently conceal the underlying color of the print. To provide sufficient concealment,
A film thickness twice or more of this is required. In silk screen printing, usually it is possible to obtain a film thickness sufficiently hide the base color, evaluation of the case where the color tone was compared with tampon printing is higher than the tampon printing. However, the biggest drawback of silk screen printing is that printing on a cubic surface cannot be performed. [0009] Therefore, tampon printing (pad printing, octopus printing) is performed without using silk screen printing.
Printing with a large film thickness is attempted by the printing method of printing. As this method, in the case of tampon printing, printing is performed twice in which the ink is transferred twice on the printing material side with the tampon , but in this case, the so-called “ print shift ” occurs, in which the ink is displaced as described above. It will be lost. The present invention has been made in view of this point, and does not obtain a predetermined film thickness by performing overprinting on the printing material side, but secures the film thickness on the transfer body side and transfers the film to the printing material. It seeks to provide a way. According to the present invention, as a means for solving the above-mentioned problems, a printing original plate and a printing material are arranged, and a tampon is sequentially brought into contact with both the printing original plate and the printing material. In the printing method of transferring the characters or graphics of the printing original plate to the printing substrate by the method, the tampon,
First, the doctor ring leaves ink only in the necessary areas.
Has been brought into contact with the printing plate by adsorbing a ink, then raise it to move upward of the printed matter, is lowered back to back printing plate upwardly followed without lowering again Doc
The ink is re-adsorbed by contacting the printing original plate where ink has been left only in the necessary portions after the turbulence has been performed. According to another aspect of the present invention, there is provided a printing method characterized in that printing is performed by strongly pressing a printed material. According to such a printing method, the tampon has 2
Since the ink is adsorbed repeatedly, the amount is sufficient. When a sufficient amount of the ink is transferred to the printing material, a sufficient film thickness is formed on the printing material. FIG. 1 illustrates a printing method according to the present invention. First, in the doctor ring A, the tampon 8 located near the tip of the upper base 4 and at the ascending position moves in the direction of the printing original plate 5 as shown by the arrow. Next, in the step indicated by B, the tampon 9 which has reached the upper side of the printing original plate 5 descends on the printing original plate 5 for the first time and is pressed against the printing original plate 5. The tampon 9 having absorbed the ink from the printing original plate 5 ascends in the step C and moves to the printing position in the subsequent step D. The tampon 9 performs doctoring in the step G without descending, and moves in the direction of the printing original plate 5. When doctor ring is completed, tampon 9
In the process H, the second lowering is performed on the printing original plate 5 to press it against the printing original plate 5. The tampon 9 having picked up the ink from the printing original plate 5 ascends in the step I and moves to the printing position in the subsequent step J. The tampon 9 enters the process of K here, and printing is performed by strongly pressing the printing material 6. After printing is completed, the tampon 9 rises at that position in the process of L and ends. As described above, in the printing method according to the present invention, the ink is adsorbed twice, but the transfer to the printing material 6 is performed only once. In this case, tampon 9 has 2
Since the ink of the batch is adsorbed, the printing is performed by strongly pressing the printing material 6, so that a film thickness comparable to the conventional two batches can be obtained. Data on top of the block gauge
Performs Npon printing result of measuring the film thickness by a dial gauge, from 3 microns by conventional printing methods 5
It has been experimentally confirmed that the film thickness was changed from 8 microns to 10 microns. Since the present invention is a printing method configured as described above, a so-called " print shift " which often occurs in conventional two-time printing does not occur. As a result, the productivity is improved, and the jig and the tool for fixing the printing object can be simplified. Since the film thickness can be increased by one transfer, color matching at the time of ink toning is also facilitated.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an explanatory diagram illustrating an order of a printing method according to the present invention. FIG. 2 is a side view of a printing press used for carrying out the present invention. FIG. 3 is an explanatory diagram illustrating a conventional twice-printing order. [Description of Signs] 1 printing press 5 printing original plate 6 substrate 9 tampon

Continuation of the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) B41M 1/40 B41F 17/34 B41F 3/58-3/81

Claims (1)

(57) [Claims] [Claim 1] A printing original plate and a printing substrate are arranged side by side, and a tampon is sequentially brought into contact with both the printing printing substrate and the printing substrate, so that characters or graphics of the printing original plate are printed on the printing substrate. in the printing method of transferring, the tampon, firstly, Doc
The ink is adsorbed by contacting the printing plate with ink remaining only in the necessary part by turling, then it is raised and moved to the upper side of the printing material, and then returned to the printing plate again without lowering To lower and doctor ring again
The ink is re-adsorbed by contacting the printing plate with ink remaining only in the necessary portions , and then raised and moved above the printing material, and then lowered and strongly pressed against the printing material. A printing method characterized by printing.