Forget about the melting point. You need to be looking at the heat deflection temperature. Most of the plastics usable in this temperature range are very expensive, Teflon (PTFE) is probably the cheapest. A high temperature epoxy (such as EpoxAcast 670 HT from Smooth-On) with the addition of glass fibers or powdered metal fillers to further increase the heat resistance might also work.
Craig
---In Homebrew_PCBs@yahoogroups.com, <roomberg@...> wrote :
There are two issues here.
First is the folks who want to change the speed of the rollers toslow it down to do
just one pass.
The laminators that have two sizes of gears can have them swappedto have the bigger where the smaller
was and it will slow down.
BUT
if your laminator does not reach 340 degrees then swapping gearsdoes not get you anywhere.
Issue two is US melting nylon plastic gears when we raise the 290degree standard photo pouch
laminators to 340 degrees... and higher 370 degrees to match tonermelt temperatures.
FROM WIKI:
The 428 °F (220 °C) melting point of nylon 6 is lower than the509 °F (265 °C) melting point of nylon 66.
SO
here lies our problem.
Cheap gear motors pushing cheap gears are fine in a laminator thatis supposed to never reach
300 degrees.
And then
we cook them up with a laminator hack
and
if we go a little too far.... melt our gears:
http://www.learnmorsecode.com/laminator/royalmods9.jpg
and nobody has been able to identify the correct metal gears toreplace some of our gears.
So look into making them:
http://www.learnmorsecode.com/laminator/gearteeth.gif