PSI-Polymer Systems, Inc. Receives Patent on Leak-Proof Seal for Screen Changers Hickory, NC (March 13, 2007)

PSI-Polymer Systems Inc. has been awarded U.S. Patent No. 7,147,774 B2 by inventor Bart Jones for its “Pressure Activated
All Metal Lifetime Seal” utilized in its Model HSC Hydraulic Slide Plate and Model MSC Manual Screen Changers.

The all metal seal, which comes standard on HSC screen changers and is optional on the MSC screen changers, uses six laser cut segments to provide sealing of the slide plate at temperatures from room temperature up to 700°F and 10,000 psi head pressure.  The patented seal eliminates dead areas associated with other types of all-metal seals and eliminates the need for Teflon rings, which fail at elevated temperatures, deteriorate over time and require replacement in all applications.

 “We are pleased that we have received patent approval on our seal,” said Glenn Woodcock, President of PSI.  “It provides our customers with a big advantage as it withstands high temperatures, never requires replacement or adjustment, and lasts for the life of the screen changer. It allows for leak-free processing and uses a streamlined design that eliminates product and color hang-up.”

The inventor of the seal is PSI’s Bart Jones, well known in the industry for screen changers as the founder of Extek, Inc., now part of Xaloy Extrusion.  “We’re happy to have Bart on board with us here at PSI,” said Woodcock.  “His years of experience specifically working with screen changers in the plastics industry has proven invaluable to us and more importantly, to our customers.”

PSI Screen Changers

 All PSI screen changers are available with the patented PSI metal seal.  They come standard on the HSC hydraulic screen changer line, which is available for extruders from 2.5” (63.5mm) to 10” (254mm), with outputs from 100 lbs/hr to 10,000 lbs/hr. The company recently added its Model HSC-65 (165 mm) and Model HSC-100 (254mm) screen changers to the HSC product line.

The new seal is optional on the PSI MSC manual screen changer line, which is available in numerous sizes for outputs from 15 lbs/hr to 4,800 lbs./hr. 

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