Michael,
I was recently at the International Soldering and Flux conference at Georgia
Tech in Atlanta where Russ Wood from BNFL Fluorochemicals, Lancashire, UK,
introduced a new material that could be what you are looking for. This material
has the properties of teflon, is applied in liquid form with a perfluorocarbon
carrier solvent that is baked off and leaves a solid film of perfluorocarbon,
the solid film can act as a solder mask, and after HASL the film is removed by
subjecting it to the original carrier solvent without leaving a residue. If you
are interested in this material I suggest that you contact Dr. Laura Turbini at
Georgia Tech to get Russ Woods phone number. I'm sorry but all I have is the
address for BNFL.
Tom Carroll
Hughes Aircraft Co.
phone (310) 334-4757
email: [log in to unmask]
_______________________________________________________________________________
Subject: solder leveling tape residue
From: [log in to unmask] at CCGATE
Date: 6/24/96 5:24 AM
We are a circuit board surface finishing services provider in Austin,
TX. We currently are running a high volume part number for a customer
through our hot air solder leveling line. The part is in large panel
format and the design dictates that the gold edge connectors are
plated before solder leveling step. Their are 60 pcs. per panels that
we are covering with a Furon/CHR C690 tape. We roll the tape in a
DuPont HRL-24 resist laminator with the rolls are room temp. The
panels are detaped after solder leveling and the tape leaves behind
quite allot of residue. We have tried residue free tapes, but they
won't hold up to the horizontal leveling process. We are hand
cleaning the residue with a terpene based solvent made by MicroCare.
The process is operator dependent and we are getting scrap escapes to
the customer due to the residue.
Can anyone offer any suggestions to assist in solving this problem
such as a good sprayable aqueous cleaner, a better "residue free"
tape, or a good screenable, peelable solder mask process?
Any suggestions would be extremely appreciated.
Michael Holan
Process Engineer
Radian International, LLC
Electronics Div..
ph.: 512/310-4209
fax: 512/288-0898
e-mail: [log in to unmask]
The following is an attached File item from cc:Mail. It contains
information that had to be encoded to ensure successful transmission
through various mail systems. To decode the file use the UUDECODE
program.
--------------------------------- Cut Here ---------------------------------
begin 644 rfc822.txt
M1G)O;2!496-H3F5T+7)E<75E<W1`:7!C+F]R9PT*6"U%;G9E;&]P92U&<F]M
M.B!496-H3F5T+7)E<75E<W1`:7!C+F]R9PT*4F5C96EV960Z(&9R;VT@<VEM
M;VXN:7!C+F]R9R`H,38X+C$Q,RXR-"XV-"D-"B!B>2!%1$5.+DA!0RY#3TT@
M*%!-1$8@5C0N,RTW(",U.#@T*2!I9"`\,#%)-CE814PS-%13,#`X05140$5$
M14XN2$%#+D-/33X[($UO;BP-"B`R-"!*=6X@,3DY-B`P-3HR,SHQ,B!04U0-
M"E)E8V5I=F5D.B!F<F]M(&EP8RYO<F<@8GD@<VEM;VXN:7!C+F]R9R!V:6$@
M4TU44"`H.30P.#$V+E-'22XX+C8N.2\Y-#`T,#8N4T=)*0T*(&ED($A!03(P
M-3,V.R!-;VXL(#(T($IU;B`Q.3DV(#`W.C(Q.C`P("TP-S`P#0I296-E:79E
M9#H@8GD@:7!C+F]R9R`H4VUA:6PS+C$N,C@N,2`C,BD@:60@;3!U64%842TP
M,#`P135#.R!-;VXL#0H@,C0@2G5N(#DV(#`W.C$T($-$5`T*4F5S96YT+61A
M=&4Z($UO;BP@,C0@2G5N(#$Y.38@,#<Z,C$Z,#`@+3`W,#`-"D1A=&4Z(.X@
M,C(@2G5N(#DV(#`Y.C`W.C0X($-$5`T*4F5S96YT+69R;VTZ(%1E8VA.971`
M:7!C+F]R9PT*1G)O;3H@36EC:&%E;%](;VQA;D!P8RYR861I86XN8V]M#0I3
M=6)J96-T.B!S;VQD97(@;&5V96QI;F<@=&%P92!R97-I9'5E#0I297-E;G0M
M<V5N9&5R.B!496-H3F5T+7)E<75E<W1`:7!C+F]R9PT*4F5S96YT+7-E;F1E
M<CH@5&5C:$YE="UR97%U97-T0&EP8RYO<F<-"E1O.B!496-H3F5T0&EP8RYO
M<F<@*$E00R!496-H;FEC86P@9F]R=6TI#0I#8SH@36EC:&%E;%](;VQA;D!Z
M:7!P>2YR861I86XN8V]M#0I297-E;G0M;65S<V%G92UI9#H@/")V9'=,43$N
M,"YM3S@N;%%E<&XB0&EP8SX-"DUE<W-A9V4M:60Z(#PY-C`U,C0X,S4V+D%!
M.#,U-C$X-C,S0'!C+G)A9&EA;BYC;VT^#0I#;VYT96YT+71R86YS9F5R+65N
M8V]D:6YG.B`W0DE4#0I%;F-O9&EN9SH@,C@@5&5X=`T*3VQD+5)E='5R;BU0
M871H.B`\36EC:&%E;%](;VQA;D!P8RYR861I86XN8V]M/@T*6"U-86EL:6YG
M+4QI<W0Z(#Q496-H3F5T0&EP8RYO<F<^(&%R8VAI=F4O;&%T97-T+S0X,3@-
L"E@M3&]O<#H@5&5C:$YE=$!I<&,N;W)G#0I0<F5C961E;F-E.B!L:7-T#0H`
end
|
