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US 5,476,638 AGranted
Process and device for the production of plastics from at least two free-flowing reactants
AssigneeMaschinenfabrik Hennecke GmbH
InventorHans-Michael Sulzbach
Life of this patent
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Abstract
The maintenance of the exact metering ratio during the production of plastics, particularly foams, from free-flowing reactants loaded with pulverulent to fine-grained or fibrous additives can be improved by mixing the additive in compacted form in a preliminary mixer with at least one of the reactants. The pressure in the preliminary mixer is kept constant.
Claims3
A device for the production of plastic products from at least two free-flowing, metered reactants comprising
- a) storage containers for each reactant,
- b) feed lines leading from each storage container via metering pumps to a mix head,
- c) at least one of said feed lines leading from the storage container associated therewith via a first metering pump into a preliminary mixer and from said preliminary mixer to said mix head via a second metering pump,
- d) a feed screw for introducing pulverulent to fine-grained or fibrous additives into at least one of said reactants, said feed screw leading into said preliminary mixer,
- wherein (i) said feed screw is a compression screw, and wherein (ii) said preliminary mixer is provided with a pressure sensor, said sensor being connected by means of a signalling line via a set value comparator and rotational speed controller to the drive of said compression screw.
2 more elements
Dependencies are inferred from the claim text.