Patent
1973-03-27
1976-02-17
Blum, Daniel
23252R, B01F 718
Patent
active
039387836
ABSTRACT:
Methods and apparatus are disclosed for continuous mixing of formulations for urethane products. A hydroxyl mixture and isocyanate, the major foam components, are supplied to a mixer. In the mixer, the components are mixed by transverse shearing and agitation means. The degree of agitation is varied along the length of the mixer, which runs at a constant speed, by varying the shearing pin configuration. The flow path through the mixer is arranged to control pressure on the fluid as well as minimize the tendency of internal foam build-up to occur.
REFERENCES:
patent: 1792059 (1931-02-01), Altwegg
patent: 3012977 (1961-12-01), Wilson
patent: 3438742 (1969-04-01), Grunewald et al.
patent: 3471131 (1969-10-01), Fritzweiler et al.
patent: 3482822 (1969-12-01), Krizak
Blum Daniel
Coe Philip R.
Firth Denis A.
Kekich John
The Upjohn Company
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