posted June 13, 2001 08:50 AM               

Usually the worst circumstance occurs when the extruder head is blown off under high pressure. Hot heavy parts and electrical line can get thrown around the room at high velocity.

Sometime the barrel can get pushed off the drive (unusual) sending bolt heads flying through the room.

You don't want to mess around here. Use the lowest pressure rated rupture disk you can get away with. Find out what the manufacturer recommends as the highest pressure capability of the barrel and head and select a rupture disk of a lower rating.

posted June 13, 2001 06:17 PM               

quote:

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Originally posted by gholden:
How important is a rupture disk in an extruder barrel?

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gholden

I wouldn't worry about how Important they are - the fact is, they are required by law. I wouldn't run a machine without one - law or no law!

posted June 14, 2001 05:03 AM               

The other way to skin this particular cat, which is widely used, is to have the output of the melt pressure transducer, usually located at the die end of the barrel, wired so that the machine shuts down at some preset value.

Regards,

posted April 03, 2003 06:17 PM               

quote:

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Originally posted by Peter P:
Hi,

The other way to skin this particular cat, which is widely used, is to have the output of the melt pressure transducer, usually located at the die end of the barrel, wired so that the machine shuts down at some preset value.

Regards,

[b]Peter P.
pepe@polytech.co.uk
www.polytechconsultants.com [/B]

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It may be better to do this with more than one transducer, one for the die or head, the other for the barrel. Wire the alarm outputs in series.

Of course, if you don't maintain and regularly calibrate the transducers, they may not do you any good.

Keep the rupture disk as well. One never knows. It's no fun when the setup blows off the machine. They can go through concrete walls.