Apparatus for mixing and injection molding thermosetting polyurethane
OwnerEiji Sawa, Kenichi Kawamoto +1inventors
InventorsEiji Sawa, Kenichi Kawamoto, Gary L. Raikea
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Abstract
The invention is an apparatus for mixing and injection molding thermosetting polyurethane. The invention involves using a premixer comprising of a series of specially designed premixing chambers, one or more static, rather than dynamic, mixers, and a specially designed dual-path mixer. After the material is mixed it is pumped into an injector, and then deposited into a mold. This entire process is accomplished in an airtight environment. The mold into which the material is pumped is attached to a vacuum that decreases the chances of any air bubbles being trapped inside the mold. New features of the apparatus include a dual-path mixer and a newly designed premixing chamber.
Claims9
An apparatus for mixing and injection molding components for forming a thermosetting polyurethane substance, comprising:
- (a) a source for each component;
- (b) a premixing chamber, comprising a first inlet for receiving a first component, and a second inlet for receiving a second component;
- (c) conduits fluidly and hermetically connecting the sources of the first and second components to the premixing chamber;
- (d) the ratio of the cross-section area of each individual conduit to the total cross-section area of all the conduits is not less than 70% or greater than 130% of the ratio of the amount of the component it transports to the combined amount of all of the components;
- (e) the conduits further having an expandability such that when the pressure is increased from 9 N/cm2 to 200 N/cm2 the increase in the cross-sectional area of the conduits would be less than 20%;
- (f) a static mixer fluidly and hermetically connected to the premixing chamber;
- (g) an injector fluidly and hermetically connected to an outlet of the static mixer;
- (h) a valve located downstream from the static mixer and upstream from the injector to control low through the system;
- (i) a mold that is fluidly and hermetically connected to a nozzle of the injector;
- and
- (j) a means for controlling the temperature during the mixing and molding processes.
Dependencies are inferred from the claim text.