| 摘要 |
1284590 Comminuting E I DU PONT DE NEMOURS & CO 28 Nov 1969 [29 Nov 1968] 58349/69 Heading B2A A process of cutting up and comminuting a tacky elastic agglomerative material comprises (1) spraying into the cutting zone water at 0.02 to 0.15 1b per 1b of material, preferably atomised below 1/16" droplet size, (2) bring- ing air into contact with the spray at a relative humidity less than 60% and a temperature not over 20‹C to evaporate substantially all the water, and (3) bringing into contact with the material a dusting agent at 0.02 to 0.10 1b per 1b of tacky material. As described the dusting agent may be silica, alumina diatomaceous earth or preferably talc, passing a 325 mesh screen, and the material may be an elastomeric polymer, e.g. polyisoprenes, chlorosulfonated polyethylenes, chloroprene polymers, styrene-butadiene co-polymers, butadiene acrylonitrile copolymers, and terpolymers of ethylene propylene and conjugated dienes. The cutting apparatus comprises seven 50" blades on a rotor 20" diameter turning at 614 rpm cooperating with a bed knife. Talc is supplied by a screw feeder to a 5/16" granulator screen mounted beneath the mill casing. A 12" circular duct feeds cool air near the centre of one side of the casing just below four inlets for atomised sprays of water. Comminuted material is conveyed to a bagging machine by a vibrating conveyor. |
