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Application filedfiledCritical
Priority to JP8561571ApriorityCriticalpatent/JPS5315101B2/ja
Publication of JPS4851059ApublicationCriticalpatent/JPS4851059A/ja
Publication of JPS5315101B2publicationCriticalpatent/JPS5315101B2/ja
B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
B29C48/25—Component parts, details or accessories; Auxiliary operations
B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
B29C48/50—Details of extruders
B29C48/505—Screws
B29C48/52—Screws with an outer diameter varying along the longitudinal axis, e.g. for obtaining different thread clearance