Probably more OT, but is this a very special mould? Or process? I've seen many plastic moulds running, and I think the general principle is; while there is hot and cold water available, once running, only the chillers are required. There is a net heat being generated from the hot plastic, so only cooling needs to take place. Also, the moulds are generally heated with electric cartridge heaters.
If 280°C water was generally required for PVC, then you'd have no difficulty sourcing components. Roland On 8 February 2017 at 01:30, Leonardo Marsaglia < [email protected]> 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! > -- > *Leonardo Marsaglia*. > > ------------------------------------------------------------ > ------------------ > 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
