GB237899A - Method of producing improved cream for butter making and improved milk for cheese making and apparatus therefor - Google Patents

Abstract

237,899. Armitage, F. L. Aug. 2, 1924, [Convention date]. Sterilizing milk and cream.-A process for pasteurizing and deodorizing milk or cream comprises boiling under reduced pressure and subsequent complete or partial cooling within one container, the heating and cooling means being solely external. As shown in the Figure, the container 1 comprises two parts 2, 3 clamped together at 10, the part 3 being hemispherical and having double walls enclosing a heating and cooling space 11. A three-way cock 34 permits connection of the container 1 with the atmosphere and with an ejector pump 54 respectively. In use, the container, preferably partially exhausted, is filled with cream from a vat 63 by means of pipes 64, 33 controlled bv a cock 62. Connection is then made to atmosphere and steam is passed through the space 11 by a pipe 48, escaping through a pipe 13, 60. The cream is thus raised to a predetermined temperature and is maintained thereat by a thermostat 45 controlling a valve 47 which regulates the steam supply. Deodorization is then effected by partly exhausting the vessel 1. The passage of foam into the exhausting pipe 35 is prevented by the provision of an annular watercooled baffle 39. The ebullition of the cream keeps it sufficiently agitated. Deposition of solid matter, however, is prevented by scrapers 14, 15 revolving on a spindle 19 driven by gearing 22, 23 from a pulley 20. After boiling for a predetermined time the steam is cut off and cold water or brine is admitted into the space 11. The vacuum is then broken and the cream drawn off through the pipe 33 and pumped, by a pump 67, into a vat 69 for further cooling or other treatment. The whole operation is stated to be completed in about thirty-five minutes, boiling temperatures of from 165‹ to 175‹ F. being preferably used. The container 1 is provided with a pressure gauge 37, a low-pressure safety valve 38, a thermometer 32 and glass-covered inspection ports 42, 43, the cover of the port 43 being cleaned by a water spray from a glass pipe 44.