The applications of screen printing and membrane switches

In addition to the decorative functions and marking functions of traditional membrane panels, as well as the switching and manipulation functions of switch components, membrane switches also have switch wiring and tail lines (film circuits) that connect switch components and host equipment circuits. It has the function of reading display transparent window and indicator light transparent window, so the membrane switch is not a single panel nor a single switch component, but also an electronic whole product with function and decoration. It is a new type of electronic device.

Because the membrane switch has the characteristics of simple structure, beautiful appearance, excellent environmental resistance, long service life, light, thin, short and small, it conforms to the direction of the highly intelligent development of modern electronic instruments, so it is favored.

In the quality inspection of the membrane switch keypad, in addition to paying attention to the small difference between the color of the ink and the color required by the customer, it is more important to pay attention to the inherent quality of the membrane switch, such as kepady strength, life, adhesive peeling strength and high temperature and low temperature. , Constant damp heat and circuit loop resistance, insulation resistance, withstand voltage and other detection indicators.

Screen printing is integrated into high-tech membrane switch manufacturing technology. In addition to the above, there are many other new contents of traditional screen printing, such as computer-aided design (CAD) and manual wiring design of membrane switch circuits; isolation layer windows and the design of the air guide groove; the application of insulating ink and its ultraviolet (UV) curing; the application of non-metallic conductor carbon paste; the working environment and storage of the membrane switch by the high-tech computer numerical control (CNC) electronic automatic focus precision punch surroundings. We should consider the structure design and material selection of the membrane switch 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 that integrates high and new technologies such as optics, mechanics, electricity, chemistry, photochemistry, microelectronics, and computers.Membrane switch technology has not only the color and ink color that are concerned in traditional screen printing, and the decorative function of traditional screen printing in the production of its film panel layer, but also in the production of its circuit layer. Prevent the oxidation of silver paste circuits and the migration of silver ions, the production of multilayer interchange circuits, and the reliability of membrane switch products.

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