The Membrane Switch is one of the few independent products in the high-tech field that can be used for Screen printing. The membrane Switch has the decorative function and marking function provided by the traditional panel. In addition to the switching function of the switching element and the switching element, the film switch also has the function of the lead connecting the switching element and the host circuit (i.e. the switching circuit). The membrane switch has the function of displaying the reading of transparent window and indicator light transparent window. It is not a single new panel, nor a single switch element, but a functional and decorative electronic integral product set, which is a novel electronic device.
Membrane switch has the characteristics of simple structure, beautiful appearance, good environmental resistance, long service life, light, thin, short, small and so on. It conforms to the development direction of modern electronic devices with high integration and high intelligence. The favor of technology products. Silkscreen printing from the beginning to the present focus on decorative effect. In addition to the common commercial characteristics, another common feature is the requirement for good reproducibility of colors and patterns in screen printing and the color rendering ability of ink to achieve decorative effects.

1. Functional ink color design, color reproducibility and ink color rendering is an important factor to evaluate the quality of the film switch. However, the more important factors to evaluate the performance of the membrane switch are the conduction function and the conductive circuit. Reliability. Even if the membrane switch panel layer has good color design, color reproduction, ink color rendering, if the conduction function of the switch and the reliability of the conduction circuit is lost, everything is awkward.

The on-off function of the membrane switch and the reliability of the conductive circuit depend on the use of functional ink and other processing measures. The functional ink used by the film switch mainly guides the electric silver paste, conductive carbon paste, high-performance conductive silver, carbon ink, insulating ink.
The on-off function of the film switch and the reliability of the circuit, not only related to the quality of the functional ink, but also related to the production process, screen printing method and other aspects of the circuit design is correct and reasonable. For screen sensitive material (sensitive film or sensitive film) thickness control, sensitive layer is too thick will waste expensive functional ink, increase the cost of manufacturing, and sensitive layer is too thin will seriously affect the film. Electrical conductivity of the switch.

2. The functional ink (silver paste) in the substrate processing film switch is printed on polyester film (PET) by screen printing method. Because of the relationship between the properties of the silver paste and the PET properties, the ink must be printed before printing. In order to ensure the smooth screen printing and strong adhesion of daguerreotype PET, PET was treated several times.

(1) The silver paste circuit printed on PET must be cured by heating and drying at 130 degrees for about 30 minutes in the tunnel drying tunnel or oven. Only after this process, the silver paste circuit has conductive properties. PET films shrink at high temperatures of 130°C. PET must be thermodetermined before PET or overheated PET.
(2) surface polarity treatment corona bombardment and other treatments make PET surface with functional ink polarity groups, so that the silver paste has a firm adhesion on PET.
(3) Electrostatic protection treatment Due to the influence of static electricity, PET surface is easy to absorb dust in the air. The PET surface is treated before printing to eliminate static electricity, which can greatly improve the printing quality and ensure the electrical conductivity of the silver paste circuit.


3 strict quality detection system in the film switch quality detection work in addition to concerned about customer requirements of ink color and color reproducibility, it is more important to pay attention to the intrinsic quality of the film switch, such as the key force, life, stripping strength and high temperature, low temperature, humidity and heat circuit resistance, insulation resistance, pressure resistance and other indicators. In addition to the above contents, there are many new contents different from the traditional screen printing, such as film switch circuit computer-aided design (CAD) and manual wiring design; Design of insulation window and air duct; Application of insulating ink and UV curing; Application of film switch with carbon paste for nonmetallic conductors Working environment and storage environment of precision punch with auto focus.

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Obviously, we should judge according to the working environment and storage environment of the membrane switch. Obviously, we should consider the structure design and material selection of membrane switch according to its working environment and storage environment.

Today's screen printing has developed into a multi-disciplinary modern screen-printing technology integrating optical, mechanical, electrical, chemical, photochemistry, microelectronics and computer technology. Fourth, the paper summarizes the film switch technology in the production of panel layer should pay attention to the memory of the traditional screen printing color, ink color is the decorative function of the traditional screen printing, in the production of the circuit layer must pay attention to the electrical conductivity of the circuit, prevent the oxidation of the silver paste circuit, prevent the migration of silver ions, the production of multilayer switching circuit, and the reliability of the film switch products. The high technology content is obvious.