At 03:38 AM 11/18/2009, designer_craig wrote:
>
>
>FYI, Got a flyer from Michaels (craft store) and they had a product
>called a YUDU for just north of $200 us.
><http://www.whatdoyudu.com/products/default.aspx>http://www.whatdoyudu.com/products/default.aspx
>Its sort of an all in one unit for screen printing on T-shirts, but
>I wonder if it could have any application on DYI pcb's
i owned a screen print business for almost 25 years and my guess is
no, although i didn't look at the link. the mesh count for doing most
t-shirts is dramatically courser than for hard surfaces like copper.
plus it requires a special resist for the etchant. i did successfully
screen print many PC boards for many years. here's a tip, write to
Ulano (http://www.ulano.com/) on a letterhead requesting a sample of
their "Ulano Blue Poly-2" film and they will send you enough to make
several small boards. it requires a special 2-part developer and
they may supply that as well (ask for it). you can expose the
between plate glass and black art paper under the blue poly with
sunshine. do a test strip with pennies as art to find the exposure
time. find a local screen printer of t-shirts and ask them for scrap
fabric from when they make their screens. ask for a very fine fabric,
about 300mesh (which they will have sometime for fine images) or so
and stretch and staple it on a art canvas stretcher a few inches
larger on each side than the board you want to print. then ask a sign
printer for some enamel ink -- just a cup full will do plenty of
boards. Naz Dar
Co.http://docs.google.com/viewer?a=v&q=cache:nkPrDEZAsoYJ:www.nazdar.com/pdf/182034PC_Etch_Resist_Black_Rev%25202_022808.pdf+printed+circuit+etch+resist+ink&hl=en&gl=us&pid=bl&srcid=ADGEEShozL916Elmjj0JIiYDg56AO48v7T1sEk2aNEeapLIfDGFmvQ_oyz5zDRtw523fb9-5Wfgf0dmv0GsQptVLPYZ_FmQxebZvmkm6yOAIOxZGDQlqo0rCip4rydSTkrrKjLyl5l_Z&sig=AHIEtbT9WeoOYIloAnMDNsi1v2gB54Je8Q
makes a pc resist ink that you can get in quart sizes (a lifetime
supply). oops, now see it is gal size only. as i recall it was an
alkaline reist ink?
http://www.nazdar.com/prodDetail.asp?categoryID=0�ionID=0&subSectionID=0&subSection2ID=0&subSection3ID=0&attrCatID=0&attrIDs=0&searchtext=resist%20black&catID=&catTab=&productID=777
getting a good print is a bit of an art that requires practice. must
print off-contact. thin and clean up with mineral spirits.
but this is really only reasonable for the effort if you want to
print multiple copies of the same artwork. then it pays off--can
print hundreds for pennies a print.
huh. son-of-a-gun! we do leave an electronic footprint . . . i just
googled and at http://www.answers.com/topic/circuit-board, in the
periodicals sections of the biblio is a booklet i wrote back in the
early 90s and sold with a kit. what a gas -- Alford, William. "Screen
Printing PC Boards." Electronics Now, September 1993, pp. 38-41.
William Alford
GI Motility Medical Research Page
http://alford.grimtrojan.com/
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