Aluminum sheet plug hole net screen

Abstract

The invention relates to an aluminum sheet plug hole net screen. The aluminum sheet plug hole net screen is characterized in that an aluminum sheet on a net gauze is the same with the size of the inner edge of a net framework; the length and width of the net framework are respectively 40cm more than the length and width of an aluminum sheet drilling pattern on the net screen; after the aluminum sheet is attached in the manufacturing process, one layer of resin glue is applied onto the non-aluminum sheet drilling pattern at the bottom surface of the net screen; one layer of glue is applied to a gap between the net screen and the aluminum sheet. The aluminum sheet plug hole net screen has the advantages that by arranging the plug hole net screen, a scraping area is completely located on the aluminum sheet, and the oil leakage of the net screen is avoided on the non-drilling pattern area; the adhering area between the aluminum sheet and the net gauze is large, the glue falling of the aluminum sheet is avoided, the stress of a scraping knife completely acts onto the aluminum sheet, and the resultant force borne by utilizing the strength of the aluminum sheet and the net gauze are higher than the bearing capacity of one net gauze layer, so as to effectively prolong the service life of the aluminum sheet net.

Description

technical field [0001] The invention relates to the field of hole filling with green oil or resin in the process of PCB (printed circuit board) production, and mainly relates to an aluminum sheet plug hole screen plate related to ink plug holes. Background technique [0002] PCB solder mask plug hole aluminum mesh has always been the practice of selecting the aluminum sheet graphic area that is 5CM larger than the board and the corresponding graphics are drilled, coated with resin glue on the outside, and clinging to the center of the recycled screen whose tension meets the requirements. Put a circle of glue on the four sides of the aluminum sheet, let the glue stand for 1H and then dry it, then use adhesive tape to cover the junction of the aluminum sheet and the mesh, and cut off the mesh in the graphic area at the same time, and then glue it on the aluminum sheet and the mesh Apply sealing paste to the blank space of the frame, such as figure 1 As shown in the figure, 1 ...

AI Technical Summary

Problems solved by technology

This kind of screen has the following defects during production: ①Because the aluminum sheet and the mesh will have a height difference (that is, the thickness of the aluminum sheet is 0.2±0.02mm), and the pressure of the plug hole scraper is generally 4KG / C㎡~8KG / C㎡, The production process is also constantly scraping, and it is easy to scrape off the tape on the aluminum sheet and roll up the aluminum sheet; ②Because the ink contains organic solvents, when the ink covers the tape, the solvent will not stop Dissolving the glue on the tape, and scraping the scraper continuously back and forth will speed up the dissolution process, and the glue in the ink will form bubbles and dirt, which will affect the quality; ③Aluminum sheet is generally larger than the board on one side 5cm, so the place where the mesh and the aluminum sheet are bonded is only 5cm, the smaller the bonding area, the easier it is to degumming; If it is poor, it will fall off and form printing dirt, and the ink will seep through the place where the photosensitive paste has dropped to the board surface, forming oil leakage (see attached figure 2 )

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