ADVANCED VISCO-SEALS FOR SINGLE SCREW EXTRUDERS

• Main Authors: SPALDING, Mark A, SUN, Xiaofei
• Format: Patent
• Language: English; French
• Published: 15.02.2024
• Subjects: AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING; PERFORMING OPERATIONS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDEDFOR; SHAPING OR JOINING OF PLASTICS; TRANSPORTING; WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL

Embodiments of an extruder comprise an extruder housing having an internal wall and a single screw coaxially disposed within the extruder housing, the single screw comprising a shank, wherein the shank and/or a region of the internal wall proximate the shank comprises helical channels. The extruder further comprises a feed channel downstream of the shank, and a visco-seal comprising the helical channels and the annular gap between the shank and the internal wall, wherein the annular gap is variable across its length. Des modes de réalisation d'une extrudeuse comprennent un boîtier d'extrudeuse ayant une paroi interne et une vis unique disposée de manière coaxiale à l'intérieur du boîtier d'extrudeuse, la vis unique comprenant une tige, la tige et/ou une région de la paroi interne à proximité de la tige comprenant des canaux hélicoïdaux. L'extrudeuse comprend en outre un canal d'alimentation en aval de la tige, et un viscoseal comprenant les canaux hélicoïdaux et l'espace annulaire entre la tige et la paroi interne, l'espace annulaire étant variable sur sa longueur.