GB936848A - Improvements relating to the production of ice cream or the like - Google Patents

Abstract

936,848. Mixing in proportions. CLARKEBUILT Ltd. Oct. 23, 1961 [Aug. 28, 1961], No. 31002/61. Class 86. [Also in Groups XIII and XXVIII] In a process for producing ice cream or like products, inert gas and a mix of water and solid ingredients at a pressure of 14-17 atmospheres are violently agitated in a first heat exchanger which cools the mixed material to 22-24‹ F. and are thereafter gently worked in a second heat exchanger which further cools the material to 16-20‹ F., the material being discharged at substantially atmospheric pressure. The first heat exchanger 3, Fig. 1, may comprise a cylindrical tube 50, Fig. 2, surrounded by a jacket 51 for the circulation of refrigerant and containing a cylindrical high-speed rotary shaft 52 carrying scraper blades 54, and the second heat exchanger 5 may be similar except that the rotary shaft is square and is rotated at a substantially lower rate. The blades are arranged on the shafts in spaced rows, the blades of one row being opposite spaces in the adjacent rows. As shown, the material is discharged from the second heat exchanger 5 via a manually adjustable flow restrictor 7, and the material is supplied to the first heat exchanger 3 from a proportioning pump 1. This pump comprises an inlet 20, Fig. 7, for air and an inlet 21 for the ice cream mix which may be gravity fed from a tank (not shown). When piston 12 moves to the right, first the air and then the mix pass through duct 22 and non-return valve 25 to the interior of cylinder 10, and on the return stroke of the piston the ice cream is discharged through non-return valve 13 into outlet conduit 15. Three pumps may be provided discharging to a common outlet and operating with a phase difference of 120 degrees. An adjustable valve (Fig. 8, not shown) may be provided for varying the proportion of air added to the mixture.