Method for obtaining a printed circuit board drawing. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Ham Radio Technologies
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Many radio amateurs use personal computers and special software to design printed circuit boards. The most difficult thing in this case "is the transfer of the resulting pattern to the surface of the foil. If it is possible to print the pattern on a laser printer or copier, you can apply the pattern to the foil by thermal transfer.
The fact is that the toner used in these devices softens under the influence of temperature. A pattern of conductors printed on paper in a mirror image is placed on a carefully cleaned board, and they are transferred to the foil, "rolling" with a hot iron. After the board has cooled, the paper is washed off it in warm water. The toner has a fairly good adhesion to the foil and remains on it. Then the payment is processed in the usual way.
With this method, high quality printed circuit boards can be obtained.
If you print a pattern on paper that is used to protect the sticky layer of adhesive wallpaper or some other sticky film, and print on the side that was adjacent to the sticky layer (slippery side), then after transferring the image with an iron, the paper can be very carefully removed without waiting for it to cool completely (slightly warm). When removing the paper, while it is partially glued to the board, if you notice that the image is not completely translated, you can reheat it with an iron.
Three small notes:
- before printing a picture, it is better to warm up the printer (print one sheet, even clean, on plain paper);
- when transferring the pattern to the prepared board, put a cotton cloth over a sheet of paper, through which you heat it with an iron;
- paper for printing should be selected according to the thickness, like a regular sheet of paper for printing on a laser printer, on very thick paper the image is not fixed due to its poor heating and the cartridge may become clogged, excessively thin paper may jam in the printer.
The pressure of the iron and the warm-up time are selected empirically; with excessive pressure, the image may spread over the board; with insufficient heating, incomplete image translation. The moment of paper removal is also selected.
After etching in ferric chloride, the image is washed off with cotton wool soaked in acetone.
Publication: N. Bolshakov, rf.atnn.ru
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