Patent GB-410469-A (GB)
Title: Improvements in or relating to milk treating apparatus
IPC: A23C3/03
Filed: 1932-11-12
Abstract: 410,469. Pasteurizing milk. BLACKWELL, G. W., 84, Coldershaw Road, West Ealing, London. Nov. 12, 1932, No. 32064. [Class 49.] Apparatus for pasteurizing milk comprises means for holding the heated milk at the desired temperature for 30 minutes, during which time the milk gravitates into a tank the outlet from which is closed until the supply into the tank ceases, whereupon the outlet is opened to enable the milk to flow into another tank the outlet of which is also closed until the milk supply thereto ceases, this operation being repeated during the holding period according to any desired number of tanks that may be provided. In the construction described, the milk first passes through a heater D in an inclined sinuous path to outlets d<9>, d<10>. The heater D is constructed of parallel troughs d connected at their ends by semi-circular portions d<1> and inclined alternately in opposite directions. The troughs are supported by a series of parallel channel members d<2>, Fig. 6, which are attached alternately to opposite walls d<3>, d' of the casing so as to form a sinuous passage d<5> through which water, e.g. at 150‹ F., or other heating agents is pumped in the direction opposite to the milk flow, the water entering and leaving through pipes d', d<8>. The milk passes through outlets d<9>, d<10> and funnels E<2>, E3 to the holding apparatus E which includes a heat insulated cabinet E<6> containing two series of superimposed tanks E<1> supported on runners E<8> so that they can be removed through doors provided in the cabinet E<6>. Each tank E<1> has an outlet aperture through which the milk can be permitted to flow to the tank below. The milk flows from the last tank of each series through a funnel E<4>, E<5> to the cooler F which is constructed similarly to the heater D but has its passage d<5> divided by a vertical wall into two parts so that water can be circulated in one part and brine in the other. The tank outlets, and outlets d<9>, d<10> in the heater D, are each closed by a valve block e which can be lifted out for cleaning and the lower end of which is engaged periodically by an arm e<1> to raise it to release the milk. The arms e<1> are operated by one of a pair of vertical rods e<4> to each of which are connected the arms e<1> of alternate tanks E<1> of each series so that in operation corresponding tanks in one series will be filling and in the other emptying. The milk is passed in continuous flow through the heater D passing first to fill the top tank of one series through aperture d<9> and funnel E<2> and then through aperture d<10> and funnel E<3> to the first tank of the second series while that of the first series is emptying into the tank below, and so on. A continuous flow of milk thus passes, through one or other of funnels E4, E<5>, from the holder E into the cooler F which discharges into a tank J whence it passes to bottling apparatus. The valves e are operated automatically by means of a pair of cams e<8>, Fig. 7, rotated continuously but slowly by a shaft e<7> driven through reduction gearing from a motor. One of the cams e<8> is coupled to one of the valve operating rods e<4> through an anti-friction roller e<6> and the other cam is coupled to the other rod. Steam may be injected into cabinet E<6> to sterilize the tanks &c. The milk may be preheated filtered and centrifugally cleaned before passing to the heater D. The parts of the apparatus in contact with the milk may be made of tinned copper, stainless steel &c. The Provisional Specification describes the use of a holding apparatus in the form of a sinuous trough through which the milk flows, the formation of the heater holder and cooler as a continuous milk passage, and the use of the heat exchangers in other forms of apparatus.