Flexible Membrane Switch/Push Button Membrane Switch/Light Copper
Company Profile:
It is a high-tech enterprise specializing in the design and
production of membrane switches and touch panels. Through
continuous introduction of new equipment and continuous improvement
of process technology, our high-precision and high-quality products
have been widely used in industries and fields such as electronic
communications, industrial control, automobile industry,
instrumentation, household appliances, children's toys, military
equipment, etc.
Engineering Design:
The membrane switch structure is divided into five structural
layers: panel layer, surface adhesive layer, upper circuit,
interlayer (isolation layer), lower circuit and back glue. The
panel layer is generally made of high-toughness PET or PC
transparent and colorless sheet with a thickness of less than
0.25mm, printed with patterns and text, and its main function is to
play the role of identification and keys; the surface glue is
generally 0.05---0.15mm thick Strong double-sided adhesive, which
closely adheres the panel and the upper circuit; both the upper
circuit and the lower circuit are made of 0.125mm thick (in some
cases 0.075 and 0.1mm thickness) polyester film (PET) with
excellent toughness, silk screen conductive silver Paste and
conductive carbon paste. Drying and aging make it conductive. For
circuit outlets with a spacing of less than 1mm, the gold finger
connection socket can easily pierce the silver paste and cause
defects. It is recommended that the circuit as a whole adopts FPC
with strong wear resistance. Eliminate defects; the interlayer is
to insulate and bond between the upper circuit and the lower
circuit. Generally, a double-sided tape with a thickness of
0.1-0.25mm with a PET substrate is used; the bottom layer of the
adhesive must be considered first. Choose the strong double-sided
adhesive that can adhere closely to the adhesive surface for which
material to paste. Membrane switches are a whole. All materials are
selected to consider the overall sealing, waterproof, insulation
and aging resistance. For outdoor membrane switches, wind and rain,
changes in temperature between winter and summer, and strong
ultraviolet rays from the sun must also be considered.
Engineers must comprehensively consider the overall design of
membrane switches, taking into account both scientific and
technological properties, so that the products produced are stable,
reliable, economical and practical.
Printing:
Most of the printing of membrane switches is done through silk
screen printing. The early stage of silk screen printing is to
expose the plate. Before printing, use a film control sample to
determine whether the film is correct and whether it is damaged.
Check whether the screen is cleaned and whether it is dirty or
damaged. For small holes, in general, the circuit uses a 100T
screen, and the panel uses a 120T screen (140T or 160T screen is
used for particularly fine ones). Then check the sample to
determine whether the film is exposed or reversed (special
attention should be paid to the circuit, the lower circuit,
insulating oil, and jumper wires are exposed to the sun, the upper
circuit is reversed, and the shielding layer is exposed to the
front of the upper circuit).
The deployment of ink is an important task in the screen printing
process, which is directly related to the appearance quality of the
membrane switch. The color master must master the color knowledge
and the ink mixing process, so that the matched ink has bright
colors, good brightness and accurate hue.
