Air Products and Chemicals, Inc.

Richard D Ritter

Arthur H Anderson

Andrew P Ondush

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

The present invention relates to an improved cooling chamber for the manufacture of high-pressure reinforced hose. Hose to be treated is passed through a tubular passageway in the cooling chamber where it is contacted with a cryogenic fluid. A portion of the cryogenic fluid is passively recycled via a recycle loop to provide further cooling within the tubular passageway. An end seal is attached to one end of the cooling chamber to prevent moisture build-up and freezing inside the chamber.

Hose cooling chamber with cold gas recycle

The present invention relates to an improved cooling process for the manufacture of high-pressure reinforced hose. Hose to be treated is passed through a cooling chamber where it is contacted with a cryogenic fluid which totally flashes to a cold gas upon contact with the hose. A portion of the cold gas is passively recycled to provide further cooling. One end of the cooling chamber is sealed to prevent moisture build-up and freezing inside the chamber.

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Bath, PA, United States of America

Richard D Ritter