Method of dusting-preventive treatment of powder having...

Details Method of dusting-preventive treatment of powder having... Method of dusting-preventive treatment of powder having...

2006-02-14

2006-02-14

Ogden, Necholus (Department: 1751)

Compositions

Dust suppressants for bulk materials, or processes of...

C252S088200, C427S212000, C427S221000, C106S400000

Reexamination Certificate

active

06998067

ABSTRACT:
A method of dusting-preventive treatment in which a powder having dusting property is treated with fibril-forming PTFE (polytetrafluoroethylene) to impart non-dusting property thereto and the non-dusting property of the powder, after having been reduced during transportation, are economically and advantageously recovered or improved through a relatively simple step. The method comprises: a first dusting-preventive treatment step in which fibril-forming polytetrafluoroethylene is added to a powder having dusting property, and a compression/shear force is exerted to the mixture at a temperature in the range of 20 to 200° C. to thereby regulate powder so as to have a flow value of 150 mm to 200 mm; and a second dusting-preventive treatment step in which a compression/shear force is exerted again at a temperature in the range of 50 to 150° C., without newly adding fibril-forming polytetrafluoroethylene, to the resultant powder after the powder treated in the first step has deteriorated in dusting-preventive property during transportation with transporting means due to such an external force that the polytetrafluoroethylene fibrils partly cleave or powder particles partly fall off polytetrafluoroethylene fibril nets.

REFERENCES:
patent: 3993584 (1976-11-01), Owen et al.
patent: 5480584 (1996-01-01), Urano et al.
patent: 5788879 (1998-08-01), Ogura et al.
patent: 6464776 (2002-10-01), Tsutsumi et al.

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