5. Adhesive layer and compartment
According to your requirements for the performance and reliability of the membrane switch. Our company selects the adhesive layer and the partition layer. The glue layer and the barrier layer can use to bond the bond. Besides, It can also use to insulate and isolate the circuit layer. The resistance and resilience of the selected glue must reach constant stamping value.
We must consider that the membrane switch may encounter a very harsh environment. Because the harsh environment will affect functionality. For example, the harsh environment will affect the service life of the membrane switch. Thus, it is necessary to determine the suitable glue according to different environments. It is necessary to choose a suitable adhesive. Can’t ignore it.
The choice of glue depends on the performance of the membrane switch surface. The environment can affect the quality of the membrane switch. Meanwhile, the raw materials also affect the quality of the membrane switch.
We must also consider that for the application in special fields. Preliminary tests and simulation experiments should be carried out. Proper storage and use are important for the performance and reliability of membrane switches.
Our company has a variety of different types of US 3M adhesives. In general, they have a strong performance against harsh environments. For the same switch, the life of 3M adhesives is longer than that of ordinary plastics. Please choose your own.
6. Liner
Technical Description
There are a wide variety of materials that can be used to make liners. The following are some of the commonly used materials:
(1) Aluminum alloy
(2) Steel plate
(3) Plexiglass
(4) PVC board
(5) Epoxy resin board
The above materials can use for various sizes and thicknesses of the liner. And the liner has a variety of holes, which can equip with screws and nuts at the same time. Our company is able to provide complete equipment and package after approval.If you want a membrane switch with a liner. Please consider the following items before designing the membrane panel:
(1) A complete three-dimensional mechanical drawing should be made in detail, including all the principles (pupil position, lead-out hole, through-hole, window hole position, etc.).
(2) A profile should finish in detail.
(3) A detailed description of the composition of the lining material
7. Shape and punching
Shape and punching
Both the shape and the punch are part of the membrane switch, and they are machined from a highly accurate mold.
Form and punching form:
(1) rectangular rectangle
(2) Rounded rectangle
(3) round
(4) oval
(5) Special shape
Our factory uses special mold machine to manufactured The shape and punching molds. High precision and low cost.
What are the important design considerations?
(1) Membrane switch requires high precision, must use mold.
(2) The mold influences the price of the membrane switch.
(3) The accuracy of the mold and the complexity of the shape, the price is also different.
(4)When the same type of membrane switch process again (the mold does not need to remanufacture). No extra mold fee required.
8. Shield layer Introduction
The shielding layer is part of the membrane switch and serves the following or more:
(1) Dissipate harmful static electricity avoids damage to sensitive electronic components.
(2) Shielded membrane switch, from the surrounding radio frequency interference and electromagnetic interference.
(3) The shielding layer not only reduces or eliminates radio frequency interference. but also mitigates electromagnetic interference radiation by means of reflection or absorption.
The effectiveness and performance of the shield depend not only on the nature and structure of the shield material. but also on the frequency and distance of the shielded source. Electromagnetic interference shielding can use not only for medical equipment, military. but also for telecommunications and many other electronic devices. Since these devices equipped with new anti-jamming components, the importance of shielding increases. The typical assembly structure of my company’s previous applications is as follows
Silkscreen conductive silver:
To meet the requirements of the work, it usually printed on the polyester of the mesh structure. This layer is below the mask layer.
9. Design considerations:
(1)According to the conditions of the assembly, the membrane layer material should have enough insulation to resist static electricity. For example, a polyester film layer with a thickness of 125 µm should withstand a voltage of 15 KV.
(2)Because it should provide enough shielding for the surface of the mask layer. the weakness at the edge of the panel should be carefully considered. Even if the insulation of the mask layer is quite good. Static electricity near the edge of the panel can interfere with the periphery of the mask layer. It enters the panel through the edge of the circuit layer. Our factory will carefully design to ensure that such phenomena are avoided and protected.
(3)My company’s technical staff has a variety of tableting experience. it can help you solve a variety of special barriers related to the barrier.
(4)The customer should provide a detailed description of the required shielding layer. Some high-tech shields are more expensive and are only considered when they are in need.
Note:
Frequency, shielding material conductivity, and material thickness reduce magnetic field strength. Not only the weakening of the shielding material is related to its shielding efficiency (SE). but also the reduction of the radiation field energy. The standard unit of SE is decibel (dB). Before and after shielding. Its value is equal to the ratio of the electromagnetic field strength. For every 20 decibels increase in the value of SE. the leakage of electromagnetic interference through the shield reduced factor up to ten. A 60 dB shield reduces the value of the magnetic field strength by one-thousandth of the original value. (for example, from 5 volts/meter to 5 millivolts/meter)
