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:
Apr. 23, 2002
Filed:
Oct. 20, 2000
Brian Greer, Monroe, GA (US);
James L. Tharp, Jr., Duluth, GA (US);
Tomco2 Equipment Co., Loganville, GA (US);
Abstract
The present invention is an improved dry ice pellet manufacturing system including an automated helical injection system, a chamber having a greater filter screen ratio than prior art designs and a compressing mechanism. The automated helical injection system enables injected CO to follow an approximately helical path inside the extrusion chamber, such that CO snow begins to form, and is packed, at the die end of the chamber. The automated injection subsystem provides maximum ice production, the present system utilizes both staggered injection rates and a valve arrangement that improve (increases) upon the amount of CO injected into the extrusion chamber over time. The present invention further utilizes a chamber having a greater filter screen ratio than currently is used in the art. The extrusion chamber of the improved pelletizer of the present invention has approximately a 35% or greater filter screen ratio; filter screen ratio being defined as the ratio of filter screen area to chamber bore area. The compressing mechanism of the present invention includes a rod and piston assembly capable of travel within the chamber. The rod can be made of steel, and the piston, a sleeve retainer and sleeve can be made of UHMW polyethylene, TEFLON, DELRIN, oil filled NYLON, NYLON, or any other tough, low-friction, non-stick, non-abrasive, food-grade material.