77Views6Replies

Author Options:

PCB etching left over paper Answered

Hey everyone!
I'm in the process of etching my first PCB. I have a few questions. I'm using the toner transfer method, with hydrochloric acid and a little hydrogen peroxide as an etchant. Anyway, I transferred the toner to the board, but I believe the glossy paper I used may have been a little too thick. The toner transferred correctly, but i can manage to get all of the paper off. I've tried a tooth brush and a soft towel.

My question is, if I just go forth and etch the board will the paper dissolve with the copper on the board and give me a clean result anyway? Will the copper covered by the paper not be removed? are there any cons to this? (such as not being able to reuse my etchant)

Thank you all, your help is appreciated
Ken

Discussions

0
None
Antzy Carmasaic

4 years ago

Yep, that happens. To get all the soggy paper off, keep it in water for a longer amount of time, then use something soft, like a soft toothbrush, or better yet, rub your finger(NOT YOUR NAIL) on it and it will roll off a bit at a time.
Don't worry about the paper residue on top of the toner, just remove the one on the copper part, else copper might be left under it during etching and you might end up having a short
Beware, the toner at this stage gets easily scratched, which will cause breaks in your circuit, so don't use steel wool or acetone(it will dissolve the toner). Acetone and steel wool comes AFTER the etching is done to remove the toner.

0
None
KennyW2Antzy Carmasaic

Reply 4 years ago

Thanks for the advice. I realize it's been a while, but I've been busy. I ended up soaking it in warm water and using a pick to scratch between the traces. It seemed to work well. The board etched perfectly. As it turns out, I didn't mirror the image properly before printing XD I'm better prepared for next time though. Thanks again!

0
None
robo10302

4 years ago

A good way to remove it is to use acetone or nail polish remover its quick and easy.

0
None
robo10302

4 years ago

A good way to remove it is to use acetone or nail polish remover its quick and easy.

0
None
Downunder35m

4 years ago

Looks etched to me...
Usually a bit of paper left does not really matter as the acid goes through it.
I simply clean the board with some fine steel wool as it also helps a lot with the soldering later on.

0
None
mpilchfamilyDownunder35m

Reply 4 years ago

A full copper clad board looks etched to you?

He hasn't etched the board yet. He wants to remove the leftover paper to make sure it does etch properly otherwise he could end up with bridges across his traces.

You should be able to scrape the paper off with a box cutter or knife. Probably don't want to use steel wool as you may damage the transfer and thus the trace when you go to etch it.