O
Obelix
Guest
Does anybody know what are the drawbacks of using a paper phenolic
based pcb on a simple circuit design?
based pcb on a simple circuit design?
R
Robert Morein
Guest
"Obelix" <gt5513e@hotmail.com> wrote in message
news:763cded.0306270607.37f768b8@posting.google.com...
those boards are punched in a single operation. Holes cannot be punched into
epoxy boards; they have to be individually drilled by a CNC machine.
Paper does not lend itself to fine laminations the way glass epoxy does.
Therefore, multilayer boards are impractical. Ground planes cannot be
incorporated.
Paper is not as fire retardant as epoxy.
Epoxy is much stronger. Epoxy boards with plated-through eyelets can
reliably mount interface connectors that tend to break off when mounted on
paper boards.
If you're having a small number of boards made, you will not see the entire
cost advantage of paper, because one step hole punching is not done, AFAIK,
by any domestic board manufacturers.
news:763cded.0306270607.37f768b8@posting.google.com...
Paper phenolic is used in imported electronic equipment because the holes in
those boards are punched in a single operation. Holes cannot be punched into
epoxy boards; they have to be individually drilled by a CNC machine.
Paper does not lend itself to fine laminations the way glass epoxy does.
Therefore, multilayer boards are impractical. Ground planes cannot be
incorporated.
Paper is not as fire retardant as epoxy.
Epoxy is much stronger. Epoxy boards with plated-through eyelets can
reliably mount interface connectors that tend to break off when mounted on
paper boards.
If you're having a small number of boards made, you will not see the entire
cost advantage of paper, because one step hole punching is not done, AFAIK,
by any domestic board manufacturers.
O
Obelix
Guest
Thanks for the detailed response.
N
N. Thornton
Guest
"Robert Morein" <nowhere@nospam.com> wrote in message news:<PoacneCVyKV6I2KjXTWJhg@comcast.com>...
Hi
Paper board is much weaker.
paper board is prone to delaminating
paper board burns when hand soldered
tracks come unglued and break when parts are desoldered.
It isnt much used because it introduces some unreliability.
Regards, NT
Hi
Paper board is much weaker.
paper board is prone to delaminating
paper board burns when hand soldered
tracks come unglued and break when parts are desoldered.
It isnt much used because it introduces some unreliability.
Regards, NT
C
crzndog
Guest
This technology is known as punch & crunch for obvious reasons. There is
usually an issue with adding solder resist also and the board has to be
cured first before a mask can be added (IIRC).
positives: Cheap
very good for high volume - tooling is expensive [hard tool setup]
negative: not very good in humid environments (absorbant)
cracks/shears easily
glues don't bond copper as well to this material (ie reworkability sucks)
"Robert Morein" <nowhere@nospam.com> wrote in message
news
oacneCVyKV6I2KjXTWJhg@comcast.com...
usually an issue with adding solder resist also and the board has to be
cured first before a mask can be added (IIRC).
positives: Cheap
very good for high volume - tooling is expensive [hard tool setup]
negative: not very good in humid environments (absorbant)
cracks/shears easily
glues don't bond copper as well to this material (ie reworkability sucks)
"Robert Morein" <nowhere@nospam.com> wrote in message
news
oacneCVyKV6I2KjXTWJhg@comcast.com...