The screw is the heart of the extrusion process. A poorly designed screw, or a worn one, can sap your productivity and drain profits from your operations. This applies in every single-screw operation: blown or cast film, sheet, pipe/profile/tubing. You might have operators who adroitly set process parameters for every product run. You might have expert material formulators who ensure the recipe is perfect. But their efforts will likely be for naught if you have a poor screw.
In this collection of articles, two of the industry’s foremost authorities on screw design — Jim Frankland and Mark Spalding — offer their sage advice on screw design...what works, what doesn’t, and what to look for when things start going wrong.
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