low pressure inj molding
low pressure inj molding
(OP)
i want build a low pressure inj. machine.
i was thinking of using a hydraulic cylinder or air cylinder and heating it, however, the problem is with the seals handing up to 400f.
is there already something or maybe some synthetic seals if they can be found.
i was thinking of using a hydraulic cylinder or air cylinder and heating it, however, the problem is with the seals handing up to 400f.
is there already something or maybe some synthetic seals if they can be found.






RE: low pressure inj molding
Mike Halloran
Pembroke Pines, FL, USA
RE: low pressure inj molding
Teflon seal might work at those temps.
Regards
Pat
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RE: low pressure inj molding
RE: low pressure inj molding
RE: low pressure inj molding
He could make very good parts by precisely choreographing the cycle, all done by hand.
- Insert mold
- Measure and pour granules
- Wait for granules to melt
- Inject
- Withdraw ram, release mold clamps
- Disassemble the mold with an impact wrench
- Extract the part
- Reassemble the mold with an impact wrench
- repeat
His cycle time was usually around a minute. He'd tell you it was longer while negotiating prices, but you could hear the air cylinder in the background and time it yourself.
His molds were 'laminated', i.e. made from pieces of aluminum plate, keyed and bolted together, with no draft.
I think there are a few other guys who do things similarly. If you just need parts to use or sell, it would be cheaper to find one of those guys and work with him. If you're intending to go into the business, you'll need to accrue a lot of odd skills to get started.
Mike Halloran
Pembroke Pines, FL, USA
RE: low pressure inj molding
Regards
Pat
See FAQ731-376: Eng-Tips.com Forum Policies for tips on use of eng-tips by professional engineers &
http://eng-tips.com/market.cfm
for site rules
RE: low pressure inj molding
yep, my thought was to use another powered cylinder to operate the ram for the plastic.
i am adding a low volume molding line to our machine shop.
and i didn't want to invest in a auger type machine.
just needed to bounce the concept.
any contact info for these guys.
thanks so much
RE: low pressure inj molding
King Hill Rd
Greenville, NY 12083
(518) 966-8295
I don't know who will answer the phone; it's been a long time.
Mike Halloran
Pembroke Pines, FL, USA
RE: low pressure inj molding
Here is a place to start looking (besides ebay).
www.stopol.com