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US 5,865,535 AGranted
Dynamic mixer control in plastics and rubber processing
AssigneeM.A.HannaRubberCompounding, a division of M.A. Hanna Company
InventorDaniel C. Edwards
Life of this patent
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AssigneeM.A.HannaRubberCompounding, a division of M.A. Hanna Company
InventorDaniel C. Edwards
Estimating the term…
A simple and efficient process and automated system is provided for controlling the mixing of polymeric material and additive materials in an internal mixer to provide quality products and batch to batch product uniformity. Real time mixing temperature profiles of a plurality of good quality batches of the same product are developed. The profiles are then superimposed or averaged to produce a real time temperature curve with maximum and minimum temperature tolerance limits, thus providing a range of batch temperatures that are allowable in real time during the mixing cycle. A process control system is programmed to store the range of allowable temperatures and to signal a mixer control to change at least one of the rotor speed and the ram pressure when the real time batch temperature falls outside the reference temperature range for a predetermined period of time.
A system for controlling the mixing of a composition comprising a polymeric material and additive materials in an internal mixer having at least one variable speed mixing rotor mounted for rotation in a mixing chamber, and a ram mounted for sliding movement in a passage opening into the mixing chamber by which a variable pressure can be applied to materials in the mixing chamber, and a mixer control for controlling the rotor speed and the ram pressure, the system comprising:
A process for controlling the mixing of a composition comprising a polymeric material and additive materials in an internal mixer having at least one variable speed mixing rotor mounted for rotation in a mixing chamber, and a ram mounted for sliding movement in a passage opening into the mixing chamber by which a variable pressure can be applied to materials in the mixing chamber, and a mixer control for controlling the rotor speed and the ram pressure, the process comprising:
A process for controlling the mixing of a composition comprising a polymeric material and additive materials forming a batch in an internal mixer having at least one variable speed mixing rotor mounted for rotation in a mixing chamber, and a ram mounted for sliding movement in a passage opening into the mixing chamber by which a variable pressure can be applied to materials in the mixing chamber, a mixer control for controlling the rotor speed and the ram pressure, and a temperature sensor in the mixing chamber for sensing the batch temperature, the process comprising:
A process for controlling the mixing of a composition comprising a polymeric material and additive materials forming a batch in an internal mixer having at least one variable speed mixing rotor mounted for rotation in a mixing chamber, and a ram mounted for sliding movement in a passage opening into the mixing chamber by which a variable pressure can be applied to materials in the mixing chamber, a mixer control for controlling the rotor speed and the ram pressure, and a temperature sensor in the mixing chamber for sensing the batch temperature, the process comprising:
Dependencies are inferred from the claim text.