Silk-screen product plugging method and tool

Abstract

Provided is a via filling method for a silk-screen printing product, comprising: a pre-heating step in which ink is heated so as to increase the temperature in order to reduce the viscosity thereof to half the viscosity before heating, and a heat preservation step in which the ink is heated and heat-preserved by an ink reclaiming knife in the process of screen printing via filling until the screen printing via filling is finished. After the temperature of the ink is increased, the viscosity is reduced, so that the wall of a via can be more easily penetrated. Thus, the via filling capability can be greatly enhanced, the occurrence of foaming during via filling can be avoided, the physicochemical properties of the resin are not affected, and the product quality is also not affected.

Description

【Technical field】 [0001] The invention relates to the field of silk screen printing, in particular to a method for plugging holes of silk screen printing products. 【Background technique】 [0002] The printed board is also called a printed circuit board or a printed circuit board (Printed Circuit Board, PCB). The electrical connection between the component pins is realized through the printed wires, pads and metallized vias on the printed board. . IC carrier board is an important branch of PCB and the development direction of PCB. At present, the manufacture of IC substrates is mainly based on the build-up method, which is called "Bulidup" in the industry. The build-up method first overlaps several circuit layers and interlayer insulation layers, and heats and presses them into one. Then form a circuit layer on the interlayer insulating layer and set necessary via holes. However, in addition to metallization, via holes must be further filled by filling. Common filling meth...

AI Technical Summary

Problems solved by technology

[0004] Whether the plug hole is full and whether it is easy to generate air bubbles in the hole is not only related to the product thickness-to-diameter ratio, hole wall roughness, hole density, screen printing equipment capabilities, and screen printing parameters, but also affected by the viscosity of the ink, especially the pore size. For small and thick products, it is difficult to plug the hole with one knife, and the hole cannot be filled with resin, so the reliability of the product cannot be guaranteed; on the other hand, due to the high viscosity of the ink, the ink enters the hole instantly Affected by shear attraction, plugging and blistering are prone to occur

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