A method for making a thickened screen plate and a method for using the thickened screen printing blue glue
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A production method and screen technology, applied in transfer printing, printed circuit, printed circuit manufacturing and other directions, to achieve the effect of sufficient blue rubber blanking, improving screen printing quality, and shortening the production process
Active Publication Date: 2018-05-01
JIANGMEN SUNTAK CIRCUIT TECH
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Problems solved by technology
[0003] The present invention aims at the problem that the existing screen printing blue glue technology needs to undergo secondary screen printing to reach a thickness of 0.25-0.55mm, and provides a method for making a thickened screen plate and a method for using the thickened screen printing blue glue
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Embodiment 1
[0024] This embodiment provides a method for making a thicker screen, comprising the following steps:
[0025] (1) Stretching: Use a rectangular screen with a mesh number of 18T, a thickness of 0.16mm, and a screen tension of 18-24N / cm2. First, check whether the screen is damaged, and tighten the undamaged screen on the On the screen frame, clean both sides of the screen with sticky rollers to clean both sides of the screen.
[0026] Prepare the photosensitive paste: mix the photosensitive paste and sensitizing powder, and stir for 2-3 minutes, then let it stand for more than 2 hours to eliminate the air bubbles in the glue, then pour the photosensitive paste into the scraper and set aside.
[0027] (2) One-time grouting:
[0028] Evenly coat the photosensitive paste on the screen, then place the gauze at 40±3°C and bake for 50 minutes to cure the photosensitive paste, and the photosensitive paste will become a photosensitive film.
[0029] The coating method is to place the...
Embodiment 2
[0040] This embodiment provides a method for screen printing blue glue on a PCB, and uses the thickened screen prepared in Embodiment 1 for screen printing. The method of screen printing blue glue includes the following steps:
[0041] (1) Screen printing blue glue
[0042] Put the PCB into the screen printing machine, and adjust the position with a thicker screen plate, and then evenly coat the blue glue on the PCB, the thickness of the blue glue is 0.51mm. The viscosity of the blue glue used is 700-1000dPa·s, and the screen printing pressure is 5-6kg / cm 2 .
[0043] (2) Heat curing blue glue
[0044] Put the PCB in an oven at 155°C and bake for 45 minutes to preliminarily cure the blue glue on the PCB to form a blue glue layer with a thickness of 0.4mm.
[0045] (3) Exposure and development
[0046] Move the PCB to the exposure machine, and after developing, the graphics on the film are transferred to the blue glue layer.
[0047] (4) baking sheet
[0048] After clean...
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Abstract
The invention relates to the technical field of PCB production and manufacturing, in particular to a method for making a thickened screen and a method for using a thickened screen printing blue glue. In the present invention, the pressure-sensitive adhesive is pasted on the screen during the second and third times of grouting, so as to increase the coating space, so that thicker photosensitive paste can be coated on the screen. After three times of coating, The thickness of the photosensitive film formed by drying the photosensitive paste can reach 0.35mm. Use the 18T screen plate to make the thickened screen plate, and the thickness of the thickened screen plate can reach 0.51mm. Therefore, use this thickened screen plate to print blue on the PCB. When gluing, the thickness of the blue glue can reach 0.51mm, and the thickness of the blue glue behind the baking plate can reach 0.4mm. Even if the thickened screen prepared by the present invention is used to screen-print the blue glue on the PCB, the production requirement of the blue glue thickness of 0.25-0.55 mm can be met by only one screen printing, thereby shortening the production process of the silk-screen blue glue and improving production efficiency. When using thicker screen printing blue glue, the screen printing pressure of 5-6kg / cm2 can make the blue glue blanking more fully, uniformly, without gaps, and improve the quality of silk screen printing.
Description
technical field [0001] The invention relates to the technical field of PCB production and manufacturing, in particular to a method for making a thickened screen and a method for using a thickened screen printing blue glue. Background technique [0002] In the production and processing of PCB (Printed Circuit Board, printed circuit board), according to the design requirements, blue glue needs to be screen-printed on some PCBs, and the thickness of blue glue is generally required to be 0.25-0.55mm after baking. However, the screen used for screen printing blue glue is composed of 18T gauze and screen graphics on the gauze. The diameter of the wire of the 18T screen is 0.160mm, and the thickness of the screen graphics is generally 0.07mm. The total thickness is 0.23mm. Use such a screen to screen-print the blue glue on the PCB. The thickness of the blue glue on the PCB is 0.23mm. After baking the blue glue, the thickness of the blue glue on the PCB is generally 0.15mm, which ca...
Claims
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Application Information
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