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:
Jan. 17, 1984
Filed:
Dec. 21, 1981
William L Bice, Slaughter, LA (US);
Ernest D Graves, Jr, Baton Rouge, LA (US);
Gerald P Wagener, Baton Rouge, LA (US);
The Dow Chemical Company, Midland, MI (US);
Abstract
An apparatus is provided for predicting the extrusion performance of a thermoplastic resinous polymer, which includes at least three and preferably four capillaries arranged in series with each successive capillary having a larger passageway than that of the immediately preceding capillary and with each capillary having substantially the same ratio of passageway length to cross-sectional area. The apparatus also includes a pump for forcing a heated polymer melt through the capillaries at a constant volumetric flow rate, a sensor for measuring the temperature of the polymer melt, a sensor for measuring the pressure drop of the polymer across each capillary, and a combination recorder and processor for determining the polymer viscosity in each capillary (different shear rates), whereby the extrusion performance of the polymer can be predicted. A method for predicting extrusion performance of a thermoplastic resinous utilizing these polymer capillaries is also provided.