Figure schematically shows both batch production in a churn and continuous production in a butter making machine.
The cream can be supplied by a liquid milk dairy (surplus cream). From the intermediate storage tank the cream continues to pasteurisationat a temperature of 95C or higher. The high temperature is needed to destroy enzymes and micro-organisms that would impair the keeping quality of the butter. The heat treatment releases strongly anti oxygenic sulphhydryl compounds, which further reduce the risk of oxidation.
Vacuum deaeration can also be included in the line if the cream has an undesirable flavour or aroma, e.g. onion taste. Any flavouring will be bound in the fat and transmitted to the butter unless removed. After this the cream is returned to the pasteuriser for further treatment – heating, holding and cooling – before proceeding to the ripening tank. In the ripening tank, the cream is subjected to a temperature program which will give the fat the required crystalline structure when it solidifies during cooling. The program is selected to match factors such as the composition of the butter fat, expressed for example in terms of iodine value, which is a measure of the unsaturated fat content. The treatment can also be modified to produce butter with good consistency despite a low iodine value, e.g. when the unsaturated proportion of the fat is low. Ripening usually takes 12 – 15 hours. Where possible, the acid producing bacteria culture is added before the temperature treatment. The quantity of culture added depends on the treatment program selected with reference to the iodine value.
1. Milk reception, 2. Preheating and pasteurisation of skimmilk, 3. Fat separation, 4. Cream pasteurization, 5. Vacuum deaeration (when used), 6. Culture preparation (when used), 7. Cream ripening and souring (when used), 8.Temperature treatment, 9. Churning/working(batch), 10. Churning/working (continuous), 11. Buttermilk collection, 12. Butter silo with screw conveyor, 13. Packaging machines.
Each process includes different kinds of machines. All these machines form a whole set which guarantee the automatic production of Pasteurized Milk large quantity and high quality.
Techgen Engineering ltd, supply full set of turnkey project for production line milk products, including the complete line design, engineering management, civil engineering of Factory and the foundation building, supplying, installation of all the equipments, the supplying and installation of compressed air, water and power system and etc.