7,987,774 (Aug. 2, 2011), L. Wenger, et al., assigned to Wenger Manufacturing, Inc., Sabetha, KS

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An elongated extruder barrel is equipped with obliquely oriented steam injection ports along its length. The ports house steam lines as well as conventional steam injectors that supply high quantities of steam into this extruder. Commonly, about 6 to 8% weight steam is injected into the material during the process.