Membrane Switches have a decorative function and a marking function that are provided by a conventional panel. Besides a Switch element and a switch function of the switch element, the thin film switch also has a switch connection and a lead line (that is, a switch circuit) function that connects the switch element and the host circuit. With the readings showing the transparent window and the indicator light transparent window function, the Membrane Switch is neither a single new type of panel nor a single switch element, but an electronic whole product set with functions and decorations is a novel electronic device.

1. Functional ink

Color design, color reproducibility, and color rendering of ink are important factors in evaluating the quality of the membrane switch. However, the more important factor in evaluating the performance of the membrane switch is the conduction function of the membrane switch and the reliability of the conductive circuit. Even if the membrane switch panel layer has a good color design, color reproducibility, and color rendering of the ink, if the switch's conduction function and the reliability of the conductive circuit are lost, everything is awkward.

2. Substrate processing

The functional ink (silver paste) in the membrane switch is printed on the polyester film (PET) by Screen printing. Because of the relationship between the characteristics of the silver paste and the PET properties, a certain number of treatments must be performed on the PET before printing. In order to ensure the smooth operation of screen printing and silver paste PET on the firm adhesion.

(1) Heat setting treatment

The silver paste circuit printed on PET must be heated and dried in a tunnel drying tunnel at 130 degrees for about 30 minutes or in an oven to cure. Only after this process, the silver paste circuit has conductive properties, in order to prevent PET from experiencing a high temperature of 130 degrees Celsius. After processing, the shrinkage of the film occurs. Before the printing, the PET must be heat-fixed or directly purchased PET that has been overheated.

(2) Surface polarity treatment

By corona bombardment and the like, the polar group of the hydrophilic functional ink is obtained on the PET surface, so that the silver paste has firm adhesion on the PET.

(3) Electrostatic protection

Due to the influence of static electricity, PET surface can easily absorb dust in the air. The processing of PET surface before printing is done to eliminate static electricity, which can greatly improve the printing quality and ensure the electrical conductivity of the silver paste circuit.

3.Strict quality inspection system

In addition to the color rendering of the ink switch and the color reproducibility required by the customer, the quality of the membrane switch must focus on the intrinsic qualities of the membrane switch, such as the key force, life, peel strength, and high and low temperatures. Constant wet heat and loop resistance, insulation resistance, pressure resistance and other indicators.

4.The high-tech screen printing

In addition to the above content, screen printing incorporates high-tech membrane switch manufacturing technology. There are also many new contents that are different from traditional screen printing, such as computer-aided design (CAD) and manual wiring design of membrane switch circuits; isolation Layer window and air duct design; Insulation ink and its ultraviolet (UV) curing application; Non-metallic conductor carbon paste application; High-tech computer numerical control (CNC) electronic autofocus precision punch on the membrane switch working environment and storage environment. Obviously, we should be based on the working environment and storage environment of the membrane switch. Obviously, we should consider the membrane switch's structural design and material selection according to the working environment and storage environment of the membrane switch. Today's screen printing has developed into a new multi-disciplinary modern screen-printing technology integrating optical, mechanical, electrical, chemical, photochemical, microelectronics, and computer technologies.

5.Summary

Membrane switch technology in the production of the panel layer both the reproducibility of the color in the traditional screen printing, the color rendering of ink, which is the traditional screen printing decoration function, in the production of its circuit layer must also pay attention to the circuit The high-tech content is obvious because of its conductive properties, prevention of oxidation of silver paste circuits, migration of silver ions, multilayer interchange circuits, and the reliability of membrane switch products.

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