Filling Machine
It is used to accurately and quantitatively fill liquids or pastes into containers, ensuring that each dose is stable and correct, meeting high standards of hygiene and efficiency.
Filling Machine Filling Methods:
(1) Normal Pressure Method
Normal pressure method is also called pure gravity method, that is, under normal pressure, the liquid flows into the packaging container by its own weight. Most free-flowing non-gas-containing liquids can be filled using this method, such as liquor, fruit wine, milk, soy sauce, vinegar, etc.
(2) Isobaric Method
Isobaric method is also called pressure gravity filling method, that is, under conditions higher than atmospheric pressure, the packaging container is first inflated to form an air pressure equal to that in the liquid storage tank, and then the liquid to be filled flows into the packaging container by its own weight. This method is commonly used for filling carbonated beverages such as beer, soda, sparkling wine, etc. Filling using this method can reduce the loss of CO2 contained in such products and prevent excessive foaming during the filling process that affects product quality and quantitative accuracy.
(3) Vacuum method
The vacuum method is to fill under conditions below atmospheric pressure and can be carried out in two ways:
(a) Pressure differential vacuum method
That is, the liquid storage tank is at normal pressure, and only the packaging container is evacuated to form a vacuum. The liquid material flows due to the pressure difference between the liquid storage tank and the container to be filled, and the filling is completed. This method is more commonly used in China.
(b) Gravity vacuum method
That is, the liquid storage tank is at a vacuum, and the packaging container is first evacuated to form a vacuum equal to that in the liquid storage tank. Then the liquid material flows into the packaging container by its own weight. Due to its complex structure, it is less used in China. The vacuum filling method has a wide range of applications. It is suitable for filling liquid materials with slightly higher viscosity, such as oils, syrups, etc. It is also suitable for filling liquid materials containing vitamins, such as vegetable juice and fruit juice. The vacuum formed in the bottle means that the contact between the liquid and the air is reduced, which prolongs the shelf life of the product. The vacuum method is also suitable for filling toxic materials, such as pesticides, to reduce the leakage of toxic gases and improve working conditions.
(4) Pressure method
Using mechanical pressure or air pressure, the material to be filled is squeezed into the packaging container. This method is mainly used for filling viscous materials with high viscosity, such as ketchup, minced meat, toothpaste, balm, etc. Sometimes it can also be used for filling soft drinks such as soda. In this case, the air pressure of the soda itself is directly poured into the bottle without inflation and isobaric pressure, thereby increasing the filling speed. The foam formed is easy to disappear because there is no colloid in the soda, which has a certain impact on the filling quality.
