I have tried a few "good quality" laser printers and never
had any success. Its well known that lasers cannot
sufficiently heat up the mylar plastic film to reliably fuse
the toner. There are special transparencies available that
supposedly fix this problem. Professionals use inkjets when
it comes to making photomask for silk screening, ect.
If you have had good success with laser printed photomasks,
then please tell us more.
With the epson inkjet/epson transparencies I can expose
boards at least five times the normal period and still have
perfect masking of the image. The only problem with such
long exposures is excessive light undercut.
rolanyang wrote:
> Laser printers can be bought for roughly $100 these days.
> It's hard to beat the consistent output and quality
> of toner on transparencies. Also, if you're adventurous
> enough, they are good for direct iron-on transfer to PCB's.
>
> At that price, it's almost not worth hours of fiddling
> with inkjets - unless someone figures out how to
> do the direct inkjet resist to pcb method.
>
> ~Rolan
>
> --- In Homebrew_PCBs@yahoogroups.com, adam Seychell <adam_seychell@y...> wrote:
>
>>A while ago I tested many different inkjet transparencies on
>>several printers (Epson 660, HP 640 Deskjet) and found
>>surprising large differences in quality of the prints. You
>>can get very opaque and solid filled prints with and Epson
>>660 (or any model with same black ink composition), and
>>Epson transparencies. I have not tried the CLASSEN TRON
>>XEROMAT I Universal. The black ink in the Epson Photo 1200
>>may be compatible with these transparencies. One day I'll
>>get around to making a web page explains inkjet and
>>transparencies for producing photomaks.
>>
>>One thing I have learned is that the ink and transparency
>>MUST be compatible for good results. Looks like you found
>>one such combination, Thanks Carsten for showing us.
>>
>>Adam
>
>
>
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