# US 2014/0197252 A1 · Method for Jet Milling and Jet Mill Therefor > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2014/0197252 A1 - Document ID: US20140197252A1 - Status: Published application - Kind: A1 - Application number: 14/155,084 - Filed: 2014-01-14 - Published: 2014-07-17 - Earliest claimed: 2013-01-14 - Assignees: NETZSCH Trockenmahltechnik GmbH; Roland Nied - Inventors: Roland Nied; Hermann Sickel - Web page: https://patentgrep.com/patent/US20140197252A1 ## CPC - B02C 19/06: Jet mills - B02C 19/186: {Use of cold or heat for disintegrating (B02C4/44, B02C7/17, B02C11/08 take precedence)} - B02C 25/00: Control arrangements specially adapted for crushing or disintegrating - B02C: CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN ({household tools and machines for pulverising foodstuffs, e.g. coffee and spice mills A47J42/00; pharmaceutical mortars A61J3/02; mechanical processing of refuse and garbage B03B9/06; dressing mould materials by grinding B22C5/04}; obtaining metallic powder by crushing, grinding or milling B22F9/04; {recovery of plastics by disintegrating B29B17/00; crushing raw materials in starch making C08B30/02; beaters for papermaking D21D1/02; crushing devices specially for transport in mines E21F13/002; slag crushing devices F23J1/00; fuel milling devices in combustion apparatus F23K1/00; household devices for crushing coal F24B15/02; ice disintegrating devices F25C5/02}) ## Abstract A method for jet milling of damp or wet grist in a jet mill, such that at least one of the operating parameters is appropriately selected so that a combined drying and milling process occurs in which, to obtain an end product with predetermined degree of fineness and moisture content. The specific operating mechanism required for milling is selected so that it is greater than or equal to the specific drying requirement, and the end product is released from the jet mill with the predetermined fineness and moisture content. In addition, the invention relates to a jet mill to perform this method, such that adjusting, controlling or regulating devices are foreseen for adjusting, controlling or regulating at least one of the operating parameters. ## Claims ### Claim 1 A method for jet milling of damp or wet grist in a jet mill, such that moist or wet grist is introduced into the jet mill for milling, characterized in that at least one of the operating parameters (preliminary pressure, tension-reducing pressure and/or input temperature) in the jet mill is appropriately selected so that combined drying and milling occurs, wherein, to obtain an end product with predetermined final degree of fineness and predetermined final moisture content, the damp or wet grist is simultaneously milled in the jet mill by milling to the predetermined final degree of fineness and is dried by drying to the predetermined final moisture content, by appropriate choice of the at least one operating parameter (preliminary pressure, tension-reducing pressure and/or input temperature) the specific operating means required for milling is selected in such a way that it is greater than or equal to the specific operating means required for drying, and the end product with the predetermined final degree of fineness and the predetermined final moisture content is released from the jet mill. ### Claim 2 (depends on 1) The method according to claim 1, wherein the actual final moisture content of the grist before its release from the jet mill or the actual final moisture content of the end product is measured and monitored. ### Claim 3 (depends on 1) The method according to claim 1, wherein the at least one operating parameter of the jet mill is appropriately adjusted, controlled or regulated once or repeatedly at time intervals or at least approximately continuously for the combined drying and milling depending on the one hand on the actual final moisture content of the grist before its release from the jet mill or the actual final moisture content of the end product, and on the other hand on the predetermined final moisture content of the end product. ### Claim 4 (depends on 1) The method according to claim 1, wherein gases or superheated steams are used as operating means. ### Claim 5 A jet mill for jet milling of damp or wet grist into an end product, wherein, to adjust, control or regulate at least one of the operating parameters (preliminary pressure, tension-reducing pressure and/or input temperature) in the jet mill, adjusting, controlling or regulating devices are foreseen, by means of which the at least one operating parameter (preliminary pressure, tension-reducing pressure and/or input temperature) in the jet mill is appropriately selected so that combined drying and milling occurs in which, to obtain an end product with predetermined final degree of fineness and predetermined final moisture content, the damp or wet grist is simultaneously milled in the jet mill by milling to the predetermined final degree of fineness and dried by drying to the predetermined final moisture content, wherein the adjusting, controlling or regulating devices are configured in such a way that, by appropriate choice of the at least one operating parameter (preliminary pressure, tension-reducing pressure and/or input temperature), the specific operating means required for milling is selected so that it is greater than or equal to the specific operating means required for drying, and whereby the end product outlet of the jet mill is configured so that the end product with the predetermined final degree of fineness and the predetermined final moisture content is released from the jet mill through the end product outlet. ### Claim 6 (depends on 5) The jet mill according to claim 5, wherein devices for ascertaining or monitoring final moisture content are linked to the end product outlet of the jet mill to ascertain or monitor the actual final moisture content of the grist before its release from the jet mill or the actual final moisture content of the end product that is obtained by milling and drying the grist in the jet mill. ### Claim 7 (depends on 6) The jet mill according to claim 6, wherein the adjusting, controlling or regulating devices are configured so that the at least one operating parameter (preliminary pressure, tension-reducing pressure and/or input temperature) of the jet mill is appropriately adjusted, controlled or regulated once or repeatedly at time intervals or at least approximately continuously for the drying and milling process depending on the one hand on the actual final moisture content of the grist before its release from the jet mill of the actual final moisture content of the end product, and on the other hand on the predetermined final moisture content of the end product. ### Claim 8 (depends on 5) The jet mill according to claim 5, wherein gases or superheated steams are used as operating means.