MANUFACTURING PROCESS FOR COSMEq'IC CREAM 649 Figure 4. Lightnin In-line Axial Flow Turbine Mixer. Mixing Equipment Co.. Inc., Rochcstcr, N. Y. uct through its length within which a turbulent mixing action is achieved by a re--eated splitting of the product stream. A summary of the results of product mixed with these two test units including a comparison with the Manton-Gaulin and standard batch product is listed (Table VII). Observations were made with a light microscope to determine average droplet size. Evaluation o[ Scraped-Wall Heat Exchanger The heat exchanger is used to cool the cream leaving the in-line mixer from approximately 60øC to the filling temperature of 41øC on a continuous basis. Three heat exchanger models (potentially the most costly item in a continuous process) were evaluated in a test loop (Fig. 8).

650 JOURNAL OF THE SOCIETY OF COSMETIC CHEMISTS Figure 5. Moyno Pump, low-capacity (1 gpm), Northeastern Electric Co., Boston, Mass. Figurd' 6. ¾otator Scraped-•Vall Heat Exchanger with scraper mechanisms removed' for " 'i viewing, Vo.tator Div., Chemetron Corp., Louisville, Ky.