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. 04, 1987
Filed:
Feb. 03, 1986
Joachim Rudolph, Weil der Stadt, DE;
Werner & Pfleiderer, , DE;
Abstract
A method and apparatus for regulating the drive of dosaging devices for the controlled feeding of plastic particles, color concentrates and additives into a supply hopper of a screw extruder for producing a mixed plastic product of determined coloration, comprising periodically measuring the coloration of the mixed product at an outlet of the extruder by a spectrometer connected to a measurement probe, comparing the measured coloration of the mixed product with the coloration of the desired product, and adjusting the supply of the plastic product, concentrates and additives, as necessary, so that the measured coloration of the product at the outlet of the extruder is the same as the coloration of the desired product.