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| Author | Topic: Barrel/Screw Clearance |
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Steve H Moderator Posts: 227 |
posted August 07, 2003 03:38 AM
   
What clearance should a 90mm, constant pitch, constant depth, edge trim feed auger be rebuilt to? the SPI guideline for extrusion screws. The unit in question feeds cast film edge trim back into a cast film line, about 1 L/D beyond the main screws feed throat. Its barrel is warmed by a water jacket. Steve H IP: Logged |
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Bob Cunningham Senior Member Posts: 55 |
posted August 07, 2003 11:53 AM
You aren't gonna ask the question then disappear, are ya? :-) Is the fluff is being crammed vertically? Or is this side-fed into the barrel? -Bob Cunningham IP: Logged |
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Steve H Moderator Posts: 227 |
posted August 07, 2003 03:07 PM
Nah, reckon I'll hang round for a while Bob  It's a side feed, edge trim is drawn off, granulated and then blown back to the reclaim auger.My thought was to get it rebuilt to SPI's guide lines. Steve H IP: Logged |
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Bob Cunningham Senior Member Posts: 55 |
posted August 07, 2003 03:52 PM
Okay, darn. I could have gotten my hands on a vertical crammer design, but I think the clearances have to change for a horizontal auger. I'd bet it also depends on the stiffness of the root of the auger. -Bob Cunningham IP: Logged |
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Steve H Moderator Posts: 227 |
posted August 07, 2003 06:50 PM
Hi Bob What is your opinion on the merits of a vertical crammer into the main feed throat over a "side stuffer"- I have to think that the latter falls into the "not a good idea" catorgory. Steve H IP: Logged |
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Bob Cunningham Senior Member Posts: 55 |
posted August 11, 2003 09:11 AM
Well honestly I bet they could both be made to work, but I would prefer to have the assistance of gravity to get the fluff into the extruder (it's tough enough to convey as it is). On the other hand, a machine like the Erema sutffs the screw from the side, and works much better than a vertical crammer ever would in that situation, however it uses centrifugal force to cram the screw, which is entirely different than an auger. -Bob Cunningham IP: Logged |
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