Breadcrumbs Section. Click here to navigate to respective pages.
Chapter
Chapter
colloid mills, piston homogenizers, rotor/stator mixers, Microfluidizer™ (a registered trademark of Microfluidics International Corp.) technologies, ultrasonic mixers, and hybrid devices. Each uses a unique processing technique to shear a mixture or com-bine the flows of materials in order to form an emulsion or suspensions. Most of the time these devices are not used in a truly continuous process. Rather, after the compo-nents of a dispersed delivery system are combined and blended in a batch vessel, the components in the mixture are passed through the device, and the shearing and mixing that take place inside the device affect particle size reduction, dispersion, and emulsi-fication. 1. Rotor/Stator Mixer Disperser Emulsifiers "All mixers pump and all pumps mix." This is reflected in the earlier-shown power equation, Eq. (3). A type of in-line device that is very similar to a rotor/stator batch mixer is the rotor/stator continuous mixer disperser emulsifier. Indeed, most of the designs of this type of in-line high-shear device are essentially identical to the batch equipment designs of a given manufacturer. Since rotor/stator batch mixers are acting as submerged pumps, a design can be made that places the rotor/stator in a pump hous-ing and allows for product to be pumped through itself (Fig. 27). During the time the product is inside the rotor/stator mixing pump, the droplets and particles are subjected to a wide variety of high shear rates. All pumps of any kind impart some level of shear to the product that passes through the pump. Rotor/stator mixing pumps are designed with fine tolerance rotor/stator gaps that promote the high shear rates and high amounts of shear per pass through. Shear rates in a rotor/stator in-line mixer are equal to those in rotor/stator batch mixers. The maximum shear rates occur in the gap between the high-speed rotating Fig. 27 Rotor/stator in-line mixer disperser emulsifier. (From Ref. 31.)
DOI link for colloid mills, piston homogenizers, rotor/stator mixers, Microfluidizer™ (a registered trademark of Microfluidics International Corp.) technologies, ultrasonic mixers, and hybrid devices. Each uses a unique processing technique to shear a mixture or com-bine the flows of materials in order to form an emulsion or suspensions. Most of the time these devices are not used in a truly continuous process. Rather, after the compo-nents of a dispersed delivery system are combined and blended in a batch vessel, the components in the mixture are passed through the device, and the shearing and mixing that take place inside the device affect particle size reduction, dispersion, and emulsi-fication. 1. Rotor/Stator Mixer Disperser Emulsifiers "All mixers pump and all pumps mix." This is reflected in the earlier-shown power equation, Eq. (3). A type of in-line device that is very similar to a rotor/stator batch mixer is the rotor/stator continuous mixer disperser emulsifier. Indeed, most of the designs of this type of in-line high-shear device are essentially identical to the batch equipment designs of a given manufacturer. Since rotor/stator batch mixers are acting as submerged pumps, a design can be made that places the rotor/stator in a pump hous-ing and allows for product to be pumped through itself (Fig. 27). During the time the product is inside the rotor/stator mixing pump, the droplets and particles are subjected to a wide variety of high shear rates. All pumps of any kind impart some level of shear to the product that passes through the pump. Rotor/stator mixing pumps are designed with fine tolerance rotor/stator gaps that promote the high shear rates and high amounts of shear per pass through. Shear rates in a rotor/stator in-line mixer are equal to those in rotor/stator batch mixers. The maximum shear rates occur in the gap between the high-speed rotating Fig. 27 Rotor/stator in-line mixer disperser emulsifier. (From Ref. 31.)
colloid mills, piston homogenizers, rotor/stator mixers, Microfluidizer™ (a registered trademark of Microfluidics International Corp.) technologies, ultrasonic mixers, and hybrid devices. Each uses a unique processing technique to shear a mixture or com-bine the flows of materials in order to form an emulsion or suspensions. Most of the time these devices are not used in a truly continuous process. Rather, after the compo-nents of a dispersed delivery system are combined and blended in a batch vessel, the components in the mixture are passed through the device, and the shearing and mixing that take place inside the device affect particle size reduction, dispersion, and emulsi-fication. 1. Rotor/Stator Mixer Disperser Emulsifiers "All mixers pump and all pumps mix." This is reflected in the earlier-shown power equation, Eq. (3). A type of in-line device that is very similar to a rotor/stator batch mixer is the rotor/stator continuous mixer disperser emulsifier. Indeed, most of the designs of this type of in-line high-shear device are essentially identical to the batch equipment designs of a given manufacturer. Since rotor/stator batch mixers are acting as submerged pumps, a design can be made that places the rotor/stator in a pump hous-ing and allows for product to be pumped through itself (Fig. 27). During the time the product is inside the rotor/stator mixing pump, the droplets and particles are subjected to a wide variety of high shear rates. All pumps of any kind impart some level of shear to the product that passes through the pump. Rotor/stator mixing pumps are designed with fine tolerance rotor/stator gaps that promote the high shear rates and high amounts of shear per pass through. Shear rates in a rotor/stator in-line mixer are equal to those in rotor/stator batch mixers. The maximum shear rates occur in the gap between the high-speed rotating Fig. 27 Rotor/stator in-line mixer disperser emulsifier. (From Ref. 31.)
ABSTRACT