Bubble drying process

Alternatively, protein particles can be produced using a supercritical or near critical C02-assisted aero-solization and bubble drying process. This method utilizes the high solubility of CO2 in water, coupled with expansion of the solution through a nozzle to aerosolize aqueous solutions of drugs. When the microbubbles formed are dried, solid (such as lactose and albuterol sulfate, with size between 0.5 pm and... 

As the gas flow rate increases beyond that at minimum fluidization, the bed may continue to expand and remain homogeneous for a time. At a fairly definite velocity, however, bubbles begin to form. Further increases in flow rate distribute themselves between the dense and bubble phases in some ways that are not well correlated. Extensive bubbling is undesirable when intimate contading between phases is desired, as in drying processes or solid catalytic reactions. In order to permit bubble formation, the... 

Bubbles High moisture content Trapped air Check each step of drying process Check dried resins exposure to air Force air out of feed vent Increase screw speed and/or back pressure... 

The mainstream method at that time of producing a pressure-sensitive adhesive tape was to coat the adhesive directly onto the substrate. However, there was no technology to precisely coat the adhesive material onto the polarizers that had a low scratch threshold and low heat resistance. There were very difficult problems of contamination and air bubbles, limits to the drying process, and the strict demand for small refractive index anisotropy. Slight uneven thickness of the adhesive will lead to defects in the display, even for pressure-sensitive adhesives. AU this was completely different from the demands of customers of electronic adhesive tape so far. The aforementioned problems all led to visible optical distortions in the polarizer film. For this reason, the coating facility to apply the adhesive had to be installed in a clean room, the coating method of the pressure-sensitive adhesive transfer had to be studied, a stacked twist suppression technology had to be established, and the formation of microcrystals in the pressure-sensitive adhesive had to be suppressed, to satisfy customer requirements. 

M ass Transfer. Mass transfer in a fluidized bed can occur in several ways. Bed-to-surface mass transfer is important in plating appHcations. Transfer from the soHd surface to the gas phase is important in drying, sublimation, and desorption processes. Mass transfer can be the limiting step in a chemical reaction system. In most instances, gas from bubbles, gas voids, or the conveying gas reacts with a soHd reactant or catalyst. In catalytic systems, the surface area of a catalyst can be enormous. Eor Group A particles, surface areas of 5 to over 1000 m /g are possible. 

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