Invention Grant
- Patent Title: Method for producing powder from a granular, thermoplastic material and device for producing chips from a powdery, thermoplastic material
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Application No.: US14400923Application Date: 2013-04-29
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Publication No.: US09987607B2Publication Date: 2018-06-05
- Inventor: Urs Kirchhofer
- Applicant: BBA Innova AG
- Applicant Address: CH Aarau
- Assignee: BBA Innova AG
- Current Assignee: BBA Innova AG
- Current Assignee Address: CH Aarau
- Agency: Morgan, Lewis & Bockius LLP
- Priority: CH00685/12 20120515
- International Application: PCT/EP2013/058913 WO 20130429
- International Announcement: WO2013/171061 WO 20131121
- Main IPC: B01J2/22
- IPC: B01J2/22 ; B01J2/26 ; B29B9/04 ; B29B13/10 ; B29C47/08 ; B29C47/36

Abstract:
A method for producing powder from a coarsely granular, thermoplastic material, comprising a homogenizing first device produces a first melt from a non-homogeneous pre-mixture of the material; first chips are produced from the first melt in a second device; the chips are milled to a powder; the powder is separated into at least two fractions with coarser and finer particle sizes; and a selected fraction with finer particle sizes is returned to the method prior to milling; wherein a second melt is produced from the selected fraction in a non-homogenizing third device, with second chips being produced from the latter, and the second chips are combined with the first chips and milled with each other.
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