Screen printing method

Abstract

A screen printing method comprises a coating process of thinly coating ink 21 on the surface of a screen plate 19 for printing by a scraper 17, and a printing process of printing, on a printed material 13, the ink 21 coated on the surface of the screen plate 19 for printing by a squeegee 15 with overriding an ink puddle 22 accumulated to one end side of the surface of the screen plate 19 in the coating process. The method further comprises a degassing process of degassing bubbles in the ink 21 coated in the coating process by the pressure change between a high vacuum and an atmospheric pressure or a low vacuum after finishing the coating process and before the printing process. The printing process is carried out under a vacuum atmosphere. The invention can prevent generation of irregularities on the surface of a printed face due to air bubbles by degassing bubbles in the paste-state or ink-state coating material before printing. The quantity and thickness of the printed paste-state or ink-state coating material is uniform and thus high-quality and high-performance screen printing free from bleeding for electronic components can be obtained.

Description

technical field [0001] The present invention relates to a screen printing method, and more particularly, to a screen printing method of placing a to-be-printed object on a predetermined position on a printing table and supplying paste to the surface of a printing screen A squeegee-like or ink-like coating is slid on the screen surface using a squeegee to perform screen printing on the printed matter. Background technique [0002] In the past, in screen printing, the object to be printed is placed at a predetermined position on the printing table, and a paste or ink-like coating composed of an insulating material or a dielectric is supplied to the surface of the printing screen, and a squeegee or a squeegee is used. A squeegee and a squeegee perform desired printing on the printing surface of the object to be printed. [0003] Conventional screen printing methods are performed under normal atmospheric pressure, and there are screen printing using a stencil of a metal or othe...

AI Technical Summary

Problems solved by technology

In addition, in the screen printing method performed by a stencil in a vacuum atmosphere, since the surface of the printed resin sealing part is degassed when returning from the vacuum atmosphere to the atmospheric pressure, the printing surface is affected by the bubbles that burst out. The surface of the surface is uneven, and the position and size of the bubbles that burst out cannot be estimated and adjusted. Therefore, there is a danger of a considerable gap in the amount and thickness of the printed paste or ink-like coating.

[0007] In addition, when the stencil is brought into contact with the printing surface of the object to be printed and printed according to the pattern of pouring the paste-like or ink-like coating into the hole of the stencil, the stencil and the object to be printed are in incomplete close contact, so , the coating is transferred from the hole portion of the stencil to the back side of the stencil, and there is a danger that the coating will adhere to an undesired part of the surface of the printed object

[0008] In addition, in the screen printing method using a screen plate composed of a gauze plate, after the paste-like or ink-like coating is applied to the surface of the screen plate by a squeegee, the ink accumulated on the screen plate is collected by a squeegee. When a paste or ink pile on one end side of the surface is printed on the object to be printed, the excess coating material is transferred from the screen printing to the object to be printed, and the coating material adheres to other than the desired part of the object to be printed, and there is a risk of bleeding

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