Solid material comminution or disintegration – Processes – Plural successive comminuting operations
Patent
1975-09-19
1977-01-25
Custer, Jr., Granville Y.
Solid material comminution or disintegration
Processes
Plural successive comminuting operations
241162, 241244, B02C 1812
Patent
active
040047385
ABSTRACT:
A method of shredding a web of material is provided. The web is moved by means of a stream of air provided by rotating impeller blades in a first path toward a shredder outlet. At least a part of the web is shredded in this path by stationary first shredding teeth and the shredded portion is immediately moved out of the outlet by the stream of air. The unshredded portion of the web is pulled from the first path into a second path and shredded as it moves in the second path by means of stationary second shredding teeth positioned at substantially a right angle to the first shredding teeth. Then this shredded part of the web is moved out of the shredder by means of the stream of air.
Apparatus is provided for performing the above-described method. Such apparatus has an inlet duct and an outlet duct which, in part, define the first path, which is substantially vertical (to ground) and the impeller blades are positioned for rotation between these ducts and in the second path, which is circular and substantially horizontal. Each impeller blade carries a first shearing knife and third shredding teeth which cooperate with a stationary second shearing knife and the stationary first and second shredding teeth, which are mounted along an outer arcuate edge and a radial edge of the exit opening of the inlet duct, to shear and shred the web, which may be bead trim from polymeric film. A wrap guard prevents the film, or bead, from wrapping the fan shaft.
REFERENCES:
patent: 2635693 (1953-04-01), Gibby
patent: 3545686 (1970-12-01), Brown
Custer, Jr. Granville Y.
E. I. Du Pont de Nemours and Company
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