Patent ID: 7614780
Filing Date: 2009-11-10
Classification: B29B

Abstract:
1. A method for high-pressure mixing of chemically reactive fluid components, suitable for the manufacture of polyurethane resins, bi-component resins and molded articles, comprising: pressure feeding flow-rates of a first and at least a second fluid component to a respective injection device comprising an injection nozzle and a control needle for controlling a pressure drop of the fluid, said injection nozzle and said needle having facing surfaces to contact the fluid narrowing towards an orifice for the discharge of a fluid jet; injecting the fluid jet of each component into a mixing chamber of a mixing device where the chemical components are thoroughly mixed by turbulence and impingement, conforming the injection nozzle and/or the needle to provide a lobed orifice for the discharge of the fluid jet; adjusting the operative position of the needle with respect to the injection nozzle, to provide a lobed outlet orifice having a narrowing cross-sectional area related to the flow-rate of the chemical component, to cause a pre-established pressure drop in the jet; and generating a swirling and highly turbulent condition in the fluid jet, shaping the jet with a plurality of radial lobate formations as it flows through said lobed outlet orifice.