Production and assembly steps of membrane switches

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Production and assembly steps of membrane switches

Membrane switch is a new type of high-tech switch, has been widely used in various fields, including life based equipment. An important component of the membrane switch is the membrane panel, which includes many other steps in addition to this one. The steps and processes of membrane switch production and assembly include various aspects such as sticking tail line, punching tail line, making interlayer and veneer adhesive. We will make a detailed analysis of each small detail below.


Production and assembly steps of membrane switches

1. Put the silk-screen printed line into an oven for 40 minutes at a temperature of 115 degrees Celsius. (Note that the silk-screen printed circuit should be dried naturally.) After the circuit is baked, it is simply assembled to test whether the circuit has short circuit, open circuit, excessive resistance, etc.

2. Paste the tail line: After detecting the single-wire resistance of the baked line, press a layer of insulating tape with a laminating machine from the outlet hole to the place where the carbon slurry overlaps by 1mm (try to paste more in the direction of the key without sticking it to the key).

3. Punching the tail line: Punching out the tail line with a knife die, and the two sides of the tail line should be even (pay special attention to the tail line with small line spacing). The sample can be made by aligning a ruler with glue with the inner side of the outlet hole and drawing it from top to bottom to the edge line of the tail. Note that the ruler should be glued to the reverse side of the line so as to avoid sticking the silver paste off.

4. Making interlayer (sample): Find a piece of waste line and lay it on an interlayer of appropriate size and stick it. Use an awl to tie down the center point of the line key position. Then use a compass to draw a circle with a straight warp of 10 on the center point (it can be changed under special circumstances) and knock it down. After knocking the circle, use a blade to knock a 2mm wide ventilation groove between the circles. Note that at least more than 3 circles should be connected. At the same time, attention should be paid not to pass at the intersection of upper and lower lines. If there is, it should be sealed with transparent glue. (The sandwich of the pan slices should be square in size). The mold is formed once during mass production.

5. Assemble the circuit: First, stick the lower circuit with the punched tail line on the interlayer. When sticking, the silver paste point should be placed in the middle of the interlayer hole without bubbles. Then attach the line. Note that the positioning of the upper and lower circuits should be aligned, and the contacts should not be misaligned.

6. Sticking back glue: Stick the punched back glue on the lower circuit. When pasting, the tail line should be taken out, and the glue position should cover 4 corner lines. All paste process can not have bubbles.

7. Face glue: stick the punched face glue on the line road. Note that the glue hole should be aligned with the key position and cover the four corner lines. (The surface adhesive is made with the interlayer. If the panel bulge is large, the circle can be enlarged. The adhesive for the pan slices can also be knocked on a 2mm strip).

8. Punching: Find a piece of waste panel and stick it on the assembled line. Align the 4 corner lines. Expand the transparent hole 4 weeks by 1mm and fix it on the assembled line. Knock it down with a suitable blade. When knocking, pay attention to whether there is a line.

9. Sticker panel: Stick the tested panel on the line road. Pay attention to the alignment of the 4 corner lines when pasting, and the bubbles on the surface glue should be scraped flat, and pasted to the transparent window to see if the window is stuck. Pay attention to protect the transparent window after pasting.

10. Tail wire treatment: cut the tail wire flat, stick a layer of PET 0.125 single-sided adhesive tape on the back of carbon paste for reinforcement without terminal punching, and press the riveting pin of the tail wire conduction surface toward the terminal if terminal punching is needed. (Note that the double-layer tail line should cut a fillet outlet with a height of about 1-1.5cm at the bottom of the tail line without line).

11. Forming: Stamping (making machine) forming is an indispensable process for membrane switches. The size requirements are accurate, and the design of the mold is guaranteed. According to the size provided by the customer, as well as the thickness, size and shape of the substrate, the size of the variable is processed to produce accurate structural dimensions. The quality of the mold is the key to the forming quality of the membrane switch. During the embossing operation, the mold should reflect all the lines on the original. High-quality embossing to use hot pressing, the advantage is that the embossed relief is not deformed, there are layers and three-dimensional sense.

12. Inspection: First, check by eye to see if there is any deviation in appearance and poor silk screen printing. Then according to the line principle with each key detector one by one detection. See if there are any problems such as open circuit, short circuit, excessive resistance, etc., and pay attention to the sensitivity of the button (pay attention to whether there are double pots with pot slices). Whether the detection lamp with LED is bright or constantly bright and the brightness is not the same, pay attention to check with the sample. Each product should be sampled for life test without interruption (usually 500000 tests can be confirmed as qualified).

13, labeled packaging factory. The packaging should be neat, beautiful, delicate and generous.

Keywords: membrane switch, membrane panel, touch screen