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:
Aug. 24, 1976
Filed:
Dec. 17, 1975
Herbert Rahlfs, Troisdorf-Sieglar, DT;
Udo Hardt, Eitorf, DT;
Reifenhauser KG, Troisdorf, DT;
Abstract
An apparatus for calibrating synthetic-resin tubing issuing continuously from a nozzle comprises an inner relatively long tube extending downstream from the nozzle and connected to an exhaust pump. A shorter outer tube surrounds this inner tube and defines therewith an annular chamber. A plurality of axially spaced disks of like outside diameter are carried on this outer tube and the compartments defined between these disks communicate with the annular chamber through holes formed through the outer tube. These holes as well as axially throughgoing holes in the disks are of adjustable flow cross section for aerodynamically balancing the air flow within the tubing as it emerges from the extruder. Thus air injected into the tubing adjacent the nozzle can flow up around the disks, between the compartments of the disks, and from each of these compartments into the annular chamber, to be eventually sucked out through the relatively long tube at the center of the apparatus.