How Much L/D Do You Really Need?

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Frankland, Jim
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Extruders - Plastic products;
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In the early 1960s, extruders typically had a length/diameter ratio of 20:1, and a machine with a 24:1 L/D was considered long. Since then, extruders have gotten longer, with the 30:1 to 36:1 L/D becoming the industry stan- dard. Some extruders even exceed 40:1 L/D for special purposes like double venting, compounding, or high-speed processing.
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