The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 12, 2015
Filed:
Aug. 18, 2009
Sadao Ikeda, Toyota, JP;
Takashi Nagase, Nisshin, JP;
Sadao Ikeda, Toyota, JP;
Takashi Nagase, Nisshin, JP;
Toyota Jidosha Kabushiki Kaisha, Aichi-ken, JP;
Abstract
A seal ring is provided which allows the interior of a cylinderof a screw extruder to be maintained at elevated temperature and elevated pressure, thus suppressing a variation in the pressure in the cylinder. In a special seal ringattached to a screw shaftin the cylinder of the screw extruder so as to be rotatable integrally with the screw shaft, thus restraining a material to be treated from being fed from upstream to downstream in the cylinder, a lead grooveextending in an axial direction of the shaftis formed in an outer circumferential surfaceopposing with a predetermined gap to an inner circumferential surfaceof the cylinder. The lead grooveserves to disturb the flow of the material to be treated passing between the outer circumferential surfaceand the inner wall surfaceof the cylinderto complex the flow. This stabilizes feeding resistance to suppress a variation in the pressure in the cylinder