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US 4,136,969 AGranted
Mixing apparatus
AssigneeFrenkel C-D Aktiengesellschaft
InventorPaul Meyer
Life of this patent
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AssigneeFrenkel C-D Aktiengesellschaft
InventorPaul Meyer
Estimating the term…
A continuous mixer comprising at least one mixing zone formed by a Transfermix geometry in which the number of starts of the helical thread changes for each of the components along the length of said Transfermix zone in the opposite sense to the change of the cross-sectional area of helical grooves on said component, whereby when in operation a medium moves along said Transfermix zone, portions thereof are successively transferred between the grooves of facing helical threads as giver and taker and whereby grooves of larger cross-sectional area are of greater widths than grooves of small cross-sectional area; in a preferred embodiment the mixer has a driven rotor and stationary barrel, the helical threads thereon being of opposite hand and the number of starts facing one another at any cross-section of the Transfermix zone is such as to make a substantially constant product.
A continuous mixer comprising at least one mixing zone formed by a Transfermix geometry, said Transfermix geometry being defined by an exterior component having an internal operating surface provided with a first helical thread and an interior component having an external operating surface provided with a second helical thread of different direction from but coaxial with said first helical thread, said first and second helical threads facing one another and defining therebetween said one mixing zone, said first and second helical threads defining respective first and second helical grooves therebetween of predetermined cross-sectional areas, each of said first and second helical threads having starts, the number of said starts of said first and second helical threads change at different locations for each of said interior and exterior components along the length of said Transfermix zone in the opposite sense to the change of the cross-sectional area at different locations of said helical grooves on said interior and exterior components whereby when in operation a medium moves along said Transfermix zone and portions thereof are successively transferred between the grooves of facing helical threads, and grooves of larger cross-sectional area are of greater widths than grooves of small cross-sectional area.
A continuous mixer comprising a driven rotor and a stationary barrel each having a helical thread, said stationary barrel having an entry-opening, said rotor helical thread being opposite said entry-opening in said barrel and forming with said barrel helical thread at least one mixing zone of Transfermix geometry with said rotor and barrel threads being opposite handed threads, said rotor and barrel threads having starts, said rotor and barrel threads facing one another and defining therebetween said one mixing zone, said rotor and barrel threads defining respective rotor and barrel helical grooves therebetween of predetermined cross-sectional areas, the number of said starts of the helical thread in each of said rotor and barrel changes at different locations in the opposite sense to the change of cross-sectional area at said different locations of grooves in each said rotor and barrel, whereby when in operation a medium is moved along said Transfermix zone, portions thereof are successively transferred between the grooves of facing helical threads and grooves of larger cross-sectional area are of greater width than grooves of small cross-sectional area.
A continuous mixer comprising a driven rotor and a stationary barrel each having a helical thread, said stationary barrel having an entry-opening, said rotor helical thread being opposite said entry opening in said barrel and forming with said barrel helical thread at least two mixing zones of Transfermix geometry, and an exit zone with the helically threaded rotor and a cylindrical barrel section, within said Transfermix zones said rotor and barrel threads being opposite-handed, said rotor and barrel threads facing one another and defining therebetween said one mixing zone, said rotor and barrel threads defining respective rotor and barrel helical grooves therebetween of predetermined cross-sectional areas, the number of helical starts on the rotor in the first Transfermix zone increases as the total cross-section of the helical grooves of the thread on the rotor decreases towards zero and conversely the number of starts in the barrel decreases as the cross-section of the helical grooves of the thread on the barrel increases from substantially zero near the entry towards its maximum value at the end of the first said mixing zone, the ratio of helical groove width to helical groove depth being for all helical grooves at least a predetermined value.
Dependencies are inferred from the claim text.