What are the conditions for the production of film panel manufacturers? Colored inks are silkscreened on the transparent polymer back. Once screen printed and cut to shape, this layer becomes the color mask layer. The mask layer is an integral part of the membrane switch, which can clearly display the function, color, type, operating position and protection function of the switch.
As a membrane switch, the panel is mainly responsible for the decoration and protection of the appearance of the product. Therefore, the film used to make the panel should have at least the following conditions:
1. Good appearance: It means that the surface of the film made of the panel is smooth, the gloss is consistent, and there is no surface defects such as mechanical damage, scratches, inclusions, and stains.
2. Not afraid of good weatherability: the panel layer is the surface layer of the membrane switch exposed to the natural environment, and the panel material should not be deformed, cracked, aged and discolored under the corresponding natural environment conditions.
3. Good dimensional stability: The film required to make the panel has no obvious change in size in some temperature ranges (usually -40 ° C ~ 55 ° C).
4. Elasticity requirements: The thin layer of the panel is required to have corresponding elasticity. At the same time, the elastic deformation is small, which can be judged by the elongation of the material. Generally speaking, the greater the elongation, the greater the elastic deformation, otherwise the elasticity is poor.
5. Good chemical resistance: The panel layer may be exposed to different chemical substances, but for most common chemical substances, such as alcohols and ether mineral oils, there should be corresponding resistance to resistance.
Based on the above requirements, films commonly used for panels typically include polycarbonate, polyvinyl chloride, polyester and polyurethane.
The film panel is made of elastic film (PVC/PC/PET), and has some decorative panels indicated by functional characters. It has excellent characteristics such as being resistant to water, dust, friction, and color.
Currently widely used in household appliances, communication equipment, instrumentation, industrial control and other areas. The printing process of film panels should be divided into positive post printing for different materials and types of film panels.
What are the structures of membrane panel switches? The jigsaw technology film panel manufacturers will introduce to you.
1. Fold in half: This type can prevent jumpers, and the conductive surface can be turned down without filling holes. The disadvantage of this structure is that the simple folded line is broken.
2. Raised edge non-touch type: the surface is beautiful and has a good three-dimensional sense, but there is no tactile feeling.
3. Raised edge touch type: beautiful surface, strong three-dimensional sense and strong touch feeling.
4. The inner and outer frames are not afraid of water type: the outer frame is a closed frame without wiring, which protects the inner frame and prevents water and gas from entering the casing from the outlet groove.
5. Non-contact flat switch: good service life, but no contact.
6. Film raised touch type: excellent touch, but short service life.
7. The layout is convex: improper design, there are two simple phenomena, but the layout is damaged, and the electrical functions are also the same.
8. Metal shrapnel type: The shrapnel has a good hand feel, and the shrapnel has both tactile and wiring functions; metal shrapnel was first used in hard board membrane switches such as printed circuit boards, giving full play to the three characteristics of conduction, rebound and hand feeling of the shrapnel. In the flexible membrane switch, the application of the shrapnel first provides a tactile response (ie, hand feel), which is generally not required. The disadvantage is that the stroke of the metal shrapnel and the travel gap between the switch contacts cause the shrapnel and the switch to be unable to synchronize.
That is, when the shrapnel moves, not some of the switch contacts also move at the same time. Moreover, in the flexible circuit board, the movement of the shrapnel often exceeds the horizontal plane of its bottom. When the operating force is too large, it is easy to reverse the deformation of the shrapnel and fail to recover, commonly known as "turning to death". In fact, on the flexible circuit board, the feel of the keys can be determined by the line layer drum. Our factory has drumming equipment and technology to ensure that the keys feel uniform and good.
9. The size of the luminous body: open the bottom plastic mold. The LED line and the lower line are on the same layer: the structure is simple, but the LED window should be convex, otherwise, the LED light will have a flat version; it is suitable for small LED lights with a lower height or occasions where the number of LED lights is small. The LED line and the lower line are different layers: the structure is complex, but the LED window does not necessarily have to be convex, which is suitable for the occasions where two-color LED lights or a large number of LED lights are selected; punching molds and primer molds are required.
The materials used in membrane switch flexible circuits are insulating films, adhesives and conductors. The insulating film forms the base layer of the circuit, and the adhesive bonds the copper foil to the insulating layer. In multi-layer designs, it is then bonded to the inner layer. They are also used as protective masks to insulate circuits from dust and moisture, and to reduce stress during flexures, the copper foil forms the conductive layer.
Membrane switch (flexible circuit) materials are formed in some membrane switches, using rigid members made of aluminum or stainless steel, which can provide dimensional variability, physical support for the placement of components and wires, and stress release.
The adhesive bonds the rigid member and the flexible circuit together. Another material is sometimes used in flexible circuits, which is an adhesive layer, which is formed by coating an adhesive on both sides of an insulating film. Adhesive plies provide environmental protection and electrical insulation, and can eliminate one layer of film, as well as the ability to bond multiple layers with fewer layers. There are many varieties of insulating film materials, but the most commonly used are polyimide and polyester materials. Membrane switch is a new type of technology switch, which has been widely used in various areas, including life basic equipment.
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