Electronics > Manufacturing & Assembly

Help wanted with toner transfer (and perhaps a discovery)

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baljemmett:

--- Quote from: grumpydoc on April 20, 2013, 10:44:41 pm ---I bought some silicon release paper to try. Pretty much a non starter as it won't feed through the printer, much too thin.

--- End quote ---

Have you tried cutting a section out and then taping the leading edge to some bog-standard printer paper?  That's how I use the blue press'n'peel stuff, to avoid wastage.  Might depend on your printer's feed layout though.

grumpydoc:

--- Quote ---Have you tried cutting a section out and then taping the leading edge to some bog-standard printer paper?  That's how I use the blue press'n'peel stuff, to avoid wastage.  Might depend on your printer's feed layout though.
--- End quote ---

Even the label backing paper caused problems more times than not - in the end I found leaving a 1.5cm strip of the label at the top helped it feed through pretty much 100% of the time. The same worked for the silicon release paper but there, of course, I had to apply a strip (which didn't stick all that well) which also worked but was much more fiddly.

The result with fine features was much the same.

It probably doesn't help that a couple of paper jams have wrapped sticky label round the fuser roller - I wonder whether there is any adhesive residue that might be causing problems lifting the thin tracks. It still works fine printing onto paper and in any case any technique is only of value if it works with a printer that has bedded in a bit and the odd paper jam is going to be a fact of life.

Not to say the results haven't been encouraging. This is what last night's efforts looked like for the transfer - although I'm not intending to etch it at the moment - I was just playing around with a modified laminator for the transfer.



The border is actually 10mil but when I tried with a PCB using 12.5 mil tracks they didn't stay put on the backing paper - well most did most of the time but I couldn't get a print good enough to transfer and some were complete garbage.

An earlier run of the board above etched, tin plated and populated looks like this:



So there's definite progress being made :)



SeanB:
If there is residue on the fuser try using the cleaning mode ( either in the driver or in a menu on the printer) available on many newer HP/Canon printers.

grumpydoc:

--- Quote ---If there is residue on the fuser try using the cleaning mode ( either in the driver or in a menu on the printer) available on many newer HP/Canon printers.
--- End quote ---
I don't see a specific option, running a few sheets of plain paper through seemed to improve the print on the little OCXO module board.

What i did see on the printer html interface was a media type option which isn't available through CUPS (might be in the Windows driver but I'm normally using a Linux machine). This has "plain paper", "thick paper", "thicker paper", "thin paper" etc. I suspect this will control the fuser temperature so I can try that to see if it makes a difference. I'm assuming that going for "thin paper" will lower the temperature and it does look as though the toner is just melting and being smeared across the page.

SeanB:
Look for a cleaning option in the menu, normally under service in the menu. If it has a web server in it it has a cleaning mode. The paper option things adjust the fuser temperature and the paper feed speed settings, along with the jam detection.

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