Thermal Transfer Paper A4 SIZE for PCBs - (AD24889)

Description:

During the heat transfer process, the toner layer (ink) is transferred to other surfaces on which it cannot be printed directly, in our case a smooth laminated copper plate. The heated plastic has rubber-like properties and when melted, it will adhere to the surface of interest.

Normal white copy paper is very porous and the toner mixes with the paper fibers. Removing the paper turns out to be a challenge, as it would have to be submerged in water until it disintegrates.

Heat transfer papers for PCBs are designed for easy removal after the toner layer has adhered to the surface of interest. Some products use starch layers that dissolve in water, while others use high-temperature plastic film that does not properly combine with the toner, making it easy to peel off.

Step 1

Print the circuit of interest on the yellow transfer paper on the smooth, shiny siliconized side (do not print on the matte side). You must print the inverse of the circuit. You must use a laser printer; do not use an inkjet printer.

Step 2

Clean the plate with acetone or similar.

Step 3

Transfer the toner to the copper plate. You must not touch the printed area with your hand. Heat an iron to the maximum temperature (or alternatively, a heat transfer machine for this type of process). Use normal copy paper as a base where you will place the copper plate. These are important for better pressure and heat distribution. Place the yellow transfer paper over the copper plate, then place the hot iron and press for about 5-8 seconds on the yellow paper. Then remove the iron and place a sheet of common white paper over the transfer paper already adhered to the plate. Then place the iron and press for about 30-45 seconds on the white sheet. Let it cool for a few minutes. Then peel the copper plate from the yellow paper. Now the toner has been transferred to the plate. Check that the circuit has been properly printed on the plate.

Step 4

Etching. You can use Hydrochloric Acid and Sodium Perborate. Mix them in an appropriate container where you will submerge the plate. Submerge the plate and shake the container from side to side for two-three minutes. During the process, remove the plate two to three times so that it comes into contact with air, and then re-submerge it. Then rinse the plate with water. Dry it. With acetone, remove the toner and completely clean the plate. Check the results by measuring the continuity of the plate.