Air Products and Chemicals, Inc.

Andrew P Ondush

Richard D Ritter

Arthur H Anderson

Roger A Howells

A method and apparatus for fine grinding materials normally difficult to grind at ambient temperature, e.g. plastic and elastomeric materials in a fluid classification type impact mill utilizing liquid cryogen to pre-cool the material to be ground, to cool the material and the mill during grinding and to recycle vaporized cryogen from the mill back into the mill as the medium for conveying material to be ground into the mill.

Method for fine grinding

Apparatus for fine grinding

A cooling chamber for use in in-line association with a continuous extruder for rapidly cooling freshly extruded product, e.g. vinyl fluid hose, to prevent deformation of the fresh extrudate.

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Catasauqua, PA, United States of America

Andrew P Ondush