초록 ▼

Method for dispersing a fluid additive within only a portion of a stream of thermoplastic material comprising the steps of (a) flowing said stream of thermoplastic material into a channel having walls of substantially circular cross section, into which there has been placed a rotating mixer head hav

Method for dispersing a fluid additive within only a portion of a stream of thermoplastic material comprising the steps of (a) flowing said stream of thermoplastic material into a channel having walls of substantially circular cross section, into which there has been placed a rotating mixer head having in the surface thereof a plurality of alternate lands and grooves each of said lands and grooves having an upstream end and a downstream end, said lands alternating with said grooves and being arranged in pairs, each of said pairs having a land in loose clearance with said wall followed by a land in close clearance with said wall, said mixer head having an unobstructed internal passage positioned therein over a substantial portion of its terminal length and a plurality of conduits severally connecting elongated zones between said lands pairs and said hollow internal passage, and (b) injecting said fluid additive into said channel at a position between said upstream and downstream ends of said lands and grooves.

대표청구항 ▼

Method of producing a thermoplastic composite by dispersing a fluid additive within only a portion of a stream of thermoplastic material comprising the initial steps of (a) flowing said stream of thermoplastic material into a channel having walls of substantially circular cross section, into which t

Method of producing a thermoplastic composite by dispersing a fluid additive within only a portion of a stream of thermoplastic material comprising the initial steps of (a) flowing said stream of thermoplastic material into a channel having walls of substantially circular cross section, into which there has been placed a rotating mixer head having in the surface thereof a plurality of alternate lands and grooves each of said lands and grooves having an upstream end and a downstream end, said lands alternating with said grooves and being arranged in pairs, each of said pairs having a land in loose clearance with said wall followed by a land in close clearance with said wall, said mixer head having an unobstructed internal passage positioned therein over a substantial portion of its terminal length and a plurality of conduits severally connecting elongated zones between said land pairs and said hollow internal passage, and (b) injecting said fluid additive into said channel at a position between said upstream and downstream ends of said lands and grooves with the result that within the mixer head the core of the composite contains no fluid additive and the shell about the core has fluid additive dispersed therein.