Method for continuous mixing of foam materials
AssigneeThe Upjohn Company
InventorLawrence C. Porter
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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.
Claims3
A method of commingling liquid materials having different viscosities to provide a substantially homogeneous mixture, comprising
- introducing said materials into a stream flowing along an annular passageway, different ones of siad materials being introduced into said passageway at different locations therealong,
- transversely shearing said stream at a plurality of locations along its path with pin-like members having cross-sectional configurations which are different at different locations such that the mixing and shearing action exerted on said stream progressively increases during its flow along said annular passageway.
Dependencies are inferred from the claim text.