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US 6,264,861 B1Granted
Method for producing rounded polymeric particles
AssigneeXeikon NV
InventorsSerge Tavernier, Daniel Heitzmann, Gerrit Delen, Geert Tersago
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Abstract
A method for rounding thermoplastic particles whereby the thermoplastic particles are stirred at a temperature around their plastification temperature, Tplast, together with particles that are larger than the thermoplastic particles and that have a higher specific gravity.
Claims7
A method for rounding thermoplastic particles, comprising the steps of:
- mixing thermoplastic particles with an average volume diameter dv50 and a Tplast with ‘non-thermoplastic’ particles, the latter having a volume average particle size, d2v50 such that d2v50≧1.5×dv50, and a specific gravity at least 1.5 times larger than that of said particles to be rounded,
- mechanically mixing said mixture for a period of at least 5 min at a temperature Tmix such that Tplast−15° C.≦Tmix<Tplast+30° C., rounding said thermoplastic particles,
- cooling said mixture and
- recovering said rounded thermoplastic particles from said mixture.
1 more element
Dependencies are inferred from the claim text.