Thermal transfer technology PCB

Producing circuit boards using thermal transfer technology is currently the best choice for electronics enthusiasts to make a small number of experimental boards.

1, when the special heat transfer paper is not easy to buy, you can go to the lettering shop where the advertisement is made, you need a little instant paste liner paper. The liner paper is the “thermal transfer paper”. This is the waste after the lettering, you go to help him deal with, the boss Thank you for not too late. If there is no lettering shop in the local area, you can buy a 40CM-wide roll of new sticky notes at the cultural goods store for only 4 RMB.

2, there is a laser printer directly printed on the thermal transfer paper, no laser printer can be printed after the other printer to the copy shop copy on the "thermal transfer paper".

3, heat transfer machine: any cover business cards, photos with a plastic sealer is a heat transfer machine, the temperature is adjusted to the toner melting temperature of 180.5. The thickness of the copper-clad board is preferably not more than 0.8mm, otherwise the heat transfer machine needs to be adjusted. A new A4 size laminator also costs 200RMB. I do not recommend the use of electric irons, tens of dollars of iron can make circuit boards to the people who sell a few thousand yuan heat transfer machine also sold to whom.
4, the use of copper foil is best to use the decontamination powder friction to remove oxides and oil, oil does not remove the net, the toner and the copper foil is not easy to bond and cause waste, sandpaper is not easy to remove the net oil pollution.

5, before the thermal transfer will deal with a good copper plate on the heat transfer machine to preheat to remove water.

6, the general continuous transfer 3-4 times, on the side of the natural cooling, if the transfer method has been cooled, the transfer paper due to the different coefficient of expansion with the copper and natural fall off.

7, do not use ferric chloride corrosion, too dirty and slow but also control the temperature, 20 years ago, I used hydrogen peroxide and hydrochloric acid, industrial grade can be, general chemical stores or decorative building materials store sales, chemical reagent store too expensive . Finding a minimal plastic box can put a copper-clad board in. The smaller it is, the more it saves. Put a small amount of fresh water on the copper plate. A piece of 5*10CM copper plate will add about 2 ml of hydrochloric acid and then add about 2 ml of hydrogen peroxide. Gently oscillate. After a few minutes, a very “professional” printing plate will show up in your before. Increase the amount of hydrogen peroxide and hydrochloric acid can increase the corrosion rate, too fast and easy to cause the formation of serration edge erosion.

8, matters needing attention:

1 Both hydrogen peroxide and hydrochloric acid are corrosive. Be careful during use. If you accidentally touch your hands, wash them with plenty of water.
2 Hydrogen peroxide should be protected from light or it can easily decompose and fail.
3 Chlorine generation in corrosion should be performed in a ventilated area.

9, the key:

1 The temperature of the heat transfer machine should be appropriate. If the printing plate is not dewatered, the toner and copper plate will not be firmly bonded.
2 The oil must be removed.

Source: runmcu