A circuit board solder mask printing machine

Abstract

The invention discloses a solder resist printing machine for a circuit board. The structure of a screen printing frame comprises a screen mounting opening, a frame body, a pressing opening, an imprinting plate and a pressing sliding block. Symmetrical pressing openings are formed in the upper side and the lower side of the frame body; an impressing plate and a flattening sliding block which are matched with the impressing opening are arranged on the impressing opening; the space in the middle of the frame body is a silk screen mounting opening; a flattening sliding block matched with the pressing opening is mounted in the pressing opening. According to the invention, the two flattening sliding blocks are used for smoothly sliding in the pressing opening provided with the silk screen, thereby preventing a screen made in an inclined weaved manner or made of a nylon material from creasing; by means of the design of the shifting block and the stopping block on the flattening sliding block,the stopping block is convenient for an operator to hold, the stopping block is arranged in front of the flattening sliding block for stopping and increasing friction when the operator holds the flattening sliding block, thereby further preventing an operation from being separated from the handle.

Description

technical field [0001] The invention relates to the field of printing machines, in particular to a circuit board solder resist printing machine. Background technique [0002] The circuit board solder mask is specifically to transfer the oil grinding to the circuit board to form a pattern consistent with the film. The solder mask is a protective film that can prevent bridging during welding and provide long-term insulation and chemical resistance. The ink is printed on the circuit board by screen, and the screen is clamped in a special screen frame, and stretched to meet the requirements. During the stretching process, the screen made of twill weave or nylon is used, although it is completely Stretch, but due to its structural characteristics, there will be a slight bulge in the middle, and the tension on both sides is the same, which is different from the tension in the middle. Materials with low softness such as twill weave and nylon are easy to produce Wrinkles, resulting...

AI Technical Summary

Problems solved by technology

[0002] The circuit board solder mask is specifically to transfer the oil grinding to the circuit board to form a pattern consistent with the film. The solder mask is a protective film that can prevent bridging during welding and provide long-term insulation and chemical resistance. The ink is printed on the circuit board by screen, and the screen is clamped in a special screen frame, and stretched to meet the requirements. During the stretching process, the screen made of twill weave or nylon is used, although it is completely Stretch, but due to its structural characteristics, there will be a slight bulge in the middle, and the tension on both sides is the same, which is different from the tension in the middle. Materials with low softness such as twill weave and nylon are easy to produce Wrinkles, causing the position of the traces of the screen printing to be wrong, that is, the position of the solder mask of the circuit board is wrong, and it is unqualified

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