Chemical apparatus and process disinfecting – deodorizing – preser – Chemical reactor – Organic polymerization
Patent
1987-05-13
1989-12-12
Marcus, Michael S.
Chemical apparatus and process disinfecting, deodorizing, preser
Chemical reactor
Organic polymerization
422116, 366136, 366159, 366173, B01F 504, B01F 1502
Patent
active
048866431
ABSTRACT:
An apparatus for proportioning reaction mixtures, particularly for the manufacture of hard polyurethane foam. The apparatus includes two proportioning cylinders each for proportioning one of the components to a mixing head. The pistons of the two proportioning cylinders can be operated alternatingly for filling the cylinders with the compound and subsequently ejecting the component from the cylinders. Double-acting hydraulic cylinders driven by a common hydraulic pump operate independently from each other the proportioning pistons of the two proportioning cylinders. A servo-controlled proportional valve is provided in each of the connecting lines between the hydraulic cylinders and the hydraulic pump. The control cycles of the proportional valves determining the ejection of the two cooperating proportioning cylinders are adjusted relative to each other so as to temporarily overlap. The apparatus makes it possible to obtain a continuous constant flow of the components into the mixing head in spite of the intermittent operation of the proportioning pistons.
REFERENCES:
patent: 4399104 (1983-08-01), Coblenz et al.
patent: 4572820 (1986-02-01), Boden
Battenfeld Maschinenfabriken GmbH
Marcus Michael S.
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