I. Application of Membrane Switch in High-tech Field Membrane Switch is one of the few independent products that can be used for Screen printing in the high-tech field.
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.
Since the membrane switch has the characteristics of simple structure, beautiful appearance, excellent environmental resistance, long service life, lightness, thinness, shortness, and smallness, it conforms to the direction of high integration and high-intelligent development of modern electronic devices. The favor of technology products.
Second, the special nature of membrane switch printing Screen printing from its inception until now is focused on the decorative effect. In addition to the common commercial features, another common feature is the requirement for good reproducibility of colors and patterns and the color rendering capability of the ink during screen printing in order to achieve the decorative effect.
1. Functional ink color design, color reproducibility, and color rendering of ink are important factors in evaluating the quality of membrane switches. However, the more important factor in evaluating the performance of membrane switches is the conduction function of membrane switches and the conductive circuit. reliability. 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.
The on-off function of the membrane switch and the reliability of the conductive circuit depend on the use of the functional ink and other treatment measures. The functional ink used in the membrane switch mainly guides the electric silver paste, conductive carbon paste, high-performance conductive silver, carbon ink and insulating ink.
The on-off function of the membrane switch and the reliability of the electrical circuit there are related not only to the quality of the functional ink, but also to the correctness and rationality of the circuit design in the production process, screen making and printing methods, and the like. For the control of the thickness of screen-sensitive material (photosensitive film or photographic film), an excessively thick photosensitive layer will result in wastage of expensive functional ink and increase the manufacturing cost, while too thin a photosensitive layer will seriously affect the film. The conductive properties of the switch.
2. The functional ink (silver paste) in the substrate processing membrane switch is printed on the polyester film (PET) by the method of screen printing. Because of the relationship between the characteristics of the silver paste and the PET properties, the ink must be printed before printing. Several treatments were performed on PET to ensure the smooth operation of screen printing and the strong adhesion on silver PET.
(1) Heat setting treatment the silver paste circuit printed on PET must be heated and dried in a tunnel-type drying tunnel or oven at 130 degrees for about 30 minutes to cure. Only after this process, the silver paste circuit has conductive properties. PET suffers film shrinkage after it is subjected to a high temperature of 130°C. PET must be heat-set before PET or PET that has been overheated.
(2) Surface Polarity Treatment The corona bombardment and other treatments give the PET surface a polar group of a functional ink, so that the silver paste has firm adhesion on the PET.
(3) Electrostatic protection treatment Due to the influence of static electricity, the PET surface can easily absorb dust in the air. Before the printing, the surface of PET is treated 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 the membrane switch quality inspection work in addition to concern about the color of the ink and the color reproducibility of the customer requirements, but also more important must pay attention to the inherent quality of the membrane switch, such as the key force, life, Peel strength and high temperature, low temperature, constant damp heat and loop resistance, insulation resistance, pressure resistance and other indicators.
Third, the high-tech screen printing thinking screen printing into the high-tech membrane switch manufacturing technology in addition to the above content, there are many new content that is different from the traditional screen printing, such as membrane switch circuit computer-assisted Design (CAD) and manual wiring design; design of insulation window and air duct; application of insulating ink and ultraviolet (UV) curing; application of non-metallic conductor carbon paste; high-tech computer digital control (CNC) electronics The working environment and storage environment of the automatic focusing precision punch press for the membrane switch.
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.
Fourth, the summary membrane switch technology in the panel layer production in both the traditional screen printing color recollection of concern, the color of the ink that is the traditional screen printing decoration function, in the production of its circuit layer Attention must be paid to the electrical conductivity of the circuit, the prevention of oxidation of the silver paste circuit, the migration of silver ions, the fabrication of multilayer interchange circuits, and the reliability of membrane switch products. The high-tech content is obvious.
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