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.
MANUFACTURING PROCESS FOR COSMETIC CREAM 651 .: %.... .. Figure 7. Ilamilton Kettle (holding and/or mixing uni½. Brighton Corp., Cincinnati, Ohio Table VII Comparison of Mixer vs. Droplet Diameter Average Droplet Diameter Mixer (t•) Cream Consistency Batch method 10-15 Firm, chunky Manton-Gaulin 0.1-1 Soft, grainy Lightnin 5-10 Firm to hard, chunky Static mixer 100 Incompletely mixed Since the agitating action of the scraper in the exchanger can have a great effect on the final consistency of the cream, the heat exchangers are among the most critical elements in the cream processing operation. Scraped-wall heat exchangers are ideally suited for the continuous pro- cessing of viscous creams. The primary differences among the three units tested are in-flow path width and the geometry of the scraver. To
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