http://www.dow.com/heattrans/products/synthetic/syltherm.htm
A service of 10 yrs at 400 C is not to be sniffed at. Probably priced like gold tho. HTH Dave On 02/08/2017 06:44 PM, Dave Cole wrote: > You don't want to use steam at 1000 psi unless you absolutely have to. > I've gotten in the way of steam at high pressure and that is something > that you will never forget. At 1000 psi that is an injection hazard. > High pressure steam leaks can be invisible, and sometime inaudible, so > you might never see or hear them before it is too late. > > Use a different thermal transfer fluid and save yourself the pain, > literally. > > Most of the plastic injection machines I have seen use machines called > Thermolaters and they circulate a heating liquid to preheat the dies. > > Here they are: > http://www.conairgroup.com/products/heat-transfer/#page=tab-1 > > I thought they were mostly using Ethylene Glycol (common Car > Antifreeze?) as heat transfer fluid. Or perhaps a mix of water and > Ethylene Glycol. Ethylene Glycol boils at 387 F. > > Dave > > On 2/7/2017 6:30 PM, Leonardo Marsaglia wrote: >> Hello to all! >> >> I'm in the process of designing and planning a system to rapid >> heating/cooling a mold for plastic injection. The project is still in the >> board so I think it's a good time to ask help from you guys. >> >> I'm trying to make the system as simple as possible so I'll tell you what I >> have in mind and what are my doubts and concerns. So here it is: >> >> A high pressure vessell with resistors is what I'm planning to have as an >> accumulator and heating device. (The vessel should have pressure relief >> valves and maybe a rupture disc). The idea is to reach 1000 PSI (to avoid >> water to start boiling) and 280°C. From what I've been reading the best >> pump for this cases is a gear pump because it can handle better the thermal >> dilatation of the components. >> >> My main concern is, at the inlet of the pump the pressure is going to be >> 1000 PSI, and I have only worked with pumps at atmospheric pressure at the >> inlet side. Is this going to be a problem? The differential pressure at the >> output is intended to be 50 or 100 PSI more than at the inlet just to make >> the water flow through the mold and return to the vessel. There are going >> to be valves to switch between cool and hot water. >> >> Also I may need to consider using special materials on the pump because of >> the corrosion, or may be some additives in the water, but my main concern >> is the rough construction of the system. I'm attaching a little diagram >> with my idea just to start and discuse if it's doable or not. Needless to >> say I'm going to take every safety measure possible with this kind of >> system. >> >> I would be thankful if you can guide me or tell me if this is too >> complicated and dangerous to even give it a try. >> >> Thanks as always! >> >> >> ------------------------------------------------------------------------------ >> Check out the vibrant tech community on one of the world's most >> engaging tech sites, SlashDot.org! http://sdm.link/slashdot >> >> >> _______________________________________________ >> Emc-users mailing list >> [email protected] >> https://lists.sourceforge.net/lists/listinfo/emc-users > ------------------------------------------------------------------------------ > Check out the vibrant tech community on one of the world's most > engaging tech sites, SlashDot.org! http://sdm.link/slashdot > _______________________________________________ > Emc-users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/emc-users ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, SlashDot.org! http://sdm.link/slashdot _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
