Carbon black incorporation in polymeric material
US5626806A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 15, 1994 |
| Grant date | May 6, 1997 |
| Priority date | — |
| Expiry date | Nov 15, 2014 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29K2707/04
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A loose admixture of polymer pellets and carbon black primary aggregate (together with any other desired fillers) is subjected to a first shear and smear action to incorporate the filler(s) into the polymer and subsequently to additional shear and smear actions to deagglomerate and blend the mixture, all of these actions being carried out at temperatures well below the plasticizing temperature of the polymer so that smearing of the filler(s) into the polymer is facilitated. Each shear and smear assembly is made of similar hammer and anvil components comprising a milling tool acting as a hammer by rotating adjacent an array of stationary pegs acting as anvils. The end face of a milling tool presented to the pegs has oblique surfaces at the downstream ends of its channels and these smear the mixture against the confronting corners of the pegs. Two similar incorporating screws feed their product to a common deagglomerating screw and the product of this is either pelletized to make a feedstock or supplied to calendaring mills and extruders for further processing of the mixture.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.