Membrane switch production and assembly steps

2020-07-16

　

Membrane switch production and assembly steps

Membrane switch is a new type of high-tech switch, which has been widely used in various fields, including basic life equipment. The important component of the membrane switch is the membrane panel, which includes many other steps besides this one. Membrane switch production and assembly steps and processes include tailing, punching, making interlayer and veneer, etc. Let's make a detailed analysis of the small details.

Membrane switch production and assembly steps

1. Put the screen-printed line into the oven for 40 minutes and the temperature is 115 degrees Celsius. (Note that the silk-printed circuit should be dried naturally.) After the circuit is baked, simply assemble a piece to test the circuit for short circuits, open circuits, and excessive resistance.

2. Paste the tail wire: After detecting the single wire resistance of the baked wire, press the tail wire from the outlet hole to the position where the carbon slurry overlaps 1 mm. Press a layer of insulating tape with a laminating machine (not sticking the button as much as possible in the direction of the button Paste some).

3. Punching the tail line: Use a die to stamp the tail line, and the two sides of the tail line should be even (pay special attention to the tail line with a small line distance). For sample preparation, use a ruler with glue to align the inner side of the outlet hole from top to bottom to the edge 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.

4. Make an interlayer (sample): find a piece of waste line and lay it on an interlayer of appropriate size to stick it. Use an awl to tie the center point of the line key position, and then use a compass to draw a circle through the center point through 10 (Special circumstances may vary), knock it down. After knocking the circle, use a blade to knock a 2 mm wide vent between the circles. Note that there should be at least three circles connected together, and you should be careful not to pass at the intersection of the upper and lower lines while knocking the vent. If there is, it should be sealed with transparent glue. (The interlayer of the pan should be square in the size of the pan). During mass production, the mold is formed at a time.

5. Assemble the circuit: First paste the lower circuit of the flushed tail wire on the interlayer, and the silver paste point should be placed in the middle of the interlayer hole when pasting, there must be no bubbles. Then paste the line. Note that the positioning of the upper and lower circuits should be aligned, and the contacts cannot be misaligned.

6. Adhesive paste: Paste the finished adhesive on the lower circuit. When pasting, the tail line should be taken out, and the glue position should cover the 4 corner lines. There must be no air bubbles during the pasting process.

7. Facing adhesive: paste the punched adhesive on the upper circuit. Note that the glue hole should be aligned with the key position and cover the 4 corners. (The surface glue is made in the same way as the sandwich. If the panel is larger, the circle can be enlarged. The glue to put the pancakes can also be knocked on a 2 mm long strip).

8. Punching: Find a waste panel and stick it on the assembled circuit, align the four corners, expand the transparent hole by 1 mm for 4 weeks and set it on the installed circuit, and knock it down with a suitable blade. When tapping, pay attention to whether there is a line hit.

9. Adhesive panel: Paste the detected panel on the upper line. Note that the four corners are aligned when sticking, and the bubbles on the surface glue should be scraped flat, stick to the transparent window to see if the window is stuck. Pay attention to protect the transparent window after affixing it.

10. Tail wire treatment: Cut the tail wire flat, and put a layer of 0.125 single-sided PET on the back of the carbon paste for reinforcement without hitting the terminal. If you need to hit the terminal, press the rivet of the tail wire to the terminal. . (Note that the double-layer tail line should cut a rounded exit with a height of about 1-1.5 cm at the bottom of the tail line without the line).

11. Forming: stamping (Fu 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, shape, etc. of the substrate, the size is variable processed to produce an accurate structural size. The quality of the mold is the key to the quality of the membrane switch. During the embossing operation, the mold should reflect all the lines on the original version. High-quality embossing requires hot pressing, the advantage is that the embossed embossed is not deformed, and has a layered and three-dimensional sense.

12. Inspection: First of all, visual inspection to see if there is any deviation in appearance and poor screen printing. Then use the tester to test each key one by one according to the line principle. See if there is a problem of open circuit, short circuit, excessive resistance, etc. At the same time, pay attention to the sensitivity of the button (with a pan, pay attention to whether there are double pans). Whether the detection lamp with LED is bright or always bright and the brightness is different, please check with the sample. Each product must be sampled continuously for life testing (usually it can be confirmed as qualified if it is tested to 500,000 times).

13. Labeled and packaged before leaving the factory. The packaging should be neat, beautiful, delicate and generous.