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. 15, 1984
Filed:
May. 24, 1982
Donald B Emery, Warrenville, IL (US);
William M Herring, Elburn, IL (US);
Standard Oil Company (Indiana), Chicago, IL (US);
Abstract
The continuous in-line melt flow rate control system (40; 100) is coupled to a mixer/extruder system (10; 97) including a polymer, stabilizer and degradent feeding system (12, 16, 18; 102) supplying mixed materials to the inlet end of an extruder (24; 108) having a die head (26) at the outlet end thereof. The control system (40; 100) is coupled between a rheometer (42; 112) which monitors a slip stream (46; 110) of melt from the extruder (24; 108) and a ratio controller (48; 93) in the feeding system (12, 16, 18; 102). The control system (40; 100) includes a rheometer (42; 112) which monitors the viscosity of the slip stream of melt from the extruder (24; 108) upstream from the die head (26) and converts the monitored viscosity value to a process signal (F) and a controller (44; 84; 101) that compares the process signal (F) with a set point value (A) related to a target melt flow rate and generates a correction signal (B, C, D) when there is a difference between the process signal (F) and the set point value (A). The correction signal (D) is supplied to the degradent ratio controller (48; 93) for adjusting the amount of degradent added to the polymer fed to the extruder (24; 108) in response to the deviation of the process signal (F) from the set point value (A).