Pharmaceutical unit operations : coating by Kenneth E. Avis, Atul J. Shukla, Rong-Kun Chang

By Kenneth E. Avis, Atul J. Shukla, Rong-Kun Chang

content material: contain: advent to Coating, A. Shukla, R. Chang, & okay. Avis Sugar Coating, E. Brunson & J. Schirmer movie Coating, R. Campbell & G. Sackett Microencapsulation, R. Sparks, I. Jacobs, & N. Mason computerized Coating structures, G. Smith & J. Spencer cleansing & Validation of cleansing for covered Pharmaceutical items, W. corridor balance & quality controls, J. Addison & D. Wiggins

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A measured amount of so6. Graco Inc.. Minneapolis, MN. 7. Waukesha Cherry-Burrell, Delavan, Wt. 8. Moyno Industrial Products, Springfield, OH, 9. , Minneapolis, MN, 10. 9. Positive displacement piston pump. Courtesy of Graco Inc. lution is delivered with each revolution. Spray initiation can be ei­ ther manual or automated. The pump size should be determined by batch size; all system parameters, such as the maximum application per step, can be achieved in approximately 10 to 15 sec. Process Example The following automated sugar-coating illustration utilizes a HiCoater* Model H-100 (39 in.

A drying rate that is too fast causes the sugar to crystal­ lize into a larger crystalline structure with a rough surface texture. Color Coating Color coating is the application of a sugar syrup containing dis­ persed pigments of lake dyes and titanium dioxide. The goal of color coating is to achieve an evenly colored, smooth surface suitable for polishing to a glossy, elegant finish. The materials used to color coat tablets include sugar, water, lake dyes, titanium dioxide, and 30 Pharmaceutical Unit Operations-Coating modifiers such as gelatin or acacia.

The final few applications of color syrup should be of a small enough volume to just wet the sur­ faces of all the tablets before they are dried with exhaust air, thus achieving a very fine, smooth surface. 7. 6 _ Solutions 1. Sugar 2. U 3 . 0 10 4, Color Dispersion (70% solids) 5. 6 Solution Application Amount Solution Temperature Inlet Air Temperature Number of Applications Tablet Weight Gain 10-20 mL/kg of cores 50 O f 50 O f* 10--20 ~ 5 - 10% The failure of a coating to dry is a result of inversion of the sugar-coating solution.

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