PIPE DIES | MACHINERY
tion capillaries. A properly designed and manufac- tured die has even distribution close to the extrudate entrance point, but this is negated once the die is adjusted – shifting the extrudate off to one side. An eccentric cone is formed in the primary area, and a concentric cone exists at only one point in the process, rather than a smooth, continuous flow path with decreasing volume. A properly manufactured and aligned extruded head, along with well-maintained tooling should require little or no adjustment. Another adverse effect of unnecessary die adjustment is the stress introduced to the extrudate caused by unbalanced flow. The net effect is the final product retains memory of this imbalance and unpredictable die swell occurs.
Extrusion tooling is machined to very high
precision – and is a major capital expense. If extrud- ers treat it with the care it deserves – keeping it clean and repairing and storing it carefully and correctly – it will maintain optimum efficiency for many years. �
www.guill.com
* Glen Guillemette is president of Guill Tool
Tool cleanli- ness is important to ensure precision in all sorts of tubing extrusion
www.fb-balzanelli.it
www.fb-balzanelli.it
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