A detailed explanation of the attention to detail in conductive silver paste screen printing

Thin film switch conductive silver pasteScreen printing is the main production process. Due to its simple structure, beautiful appearance, long service life, and characteristics of being light, thin, short, and small, membrane switches are highly favored by high-tech product users as they conform to the direction of high integration and high intelligence development of modern electronic instruments. Users need to ensure the quality of printing when printing conductive silver paste for thin film switches in order to fully utilize the value of the silver paste.

1. Functional conductive silver paste

Measuring membrane switchesConductive silver pasteThe more important factors affecting the performance are the conductivity function of the thin film switch conductive silver paste and the reliability of the conductive circuit. The conductivity function of thin film switch conductive silver paste and the reliability of the conductive circuit are not only related to the quality of functional conductive silver paste, but also closely related to the correctness and rationality of circuit design in the manufacturing process, as well as screen printing and printing methods.

2. Substrate processing

1) Heat setting treatment

To prevent film shrinkage of PET after being subjected to high temperature treatment at 130 ℃, it is necessary to perform heat setting treatment on PET before printing or directly purchase PET that has undergone heat setting treatmentPET printing silver paste.

2) Surface polarity treatment

By using corona bombardment and other treatments, a layer of polar functional ink groups is obtained on the surface of PET, which gives the silver paste a strong powder adhesion on PET.

3) Electrostatic protection treatment

Due to the influence of static electricity, the surface of PET is prone to absorb dust in the air. Pre printing treatment of PET surface to eliminate static electricity can greatly improve printing quality and ensure the conductivity of silver paste circuits.

3. Strict product inspection

In the quality inspection of conductive silver paste for thin film switches, in addition to paying attention to the color rendering of the silver paste and the color reproducibility required by customers, it is more important to focus on the intrinsic quality of the thin film switch, such as key force, lifespan, peel strength, as well as testing indicators such as high temperature, low temperature, constant humidity and heat, return resistance, insulation resistance, and withstand voltage.