Different liquids have different physical and chemical properties. When filling, it is necessary to maintain the stability of liquid characteristics. Therefore, different filling methods are required. The specific filling methods are mainly as follows.
1 Normal pressure filling method
Take dosing cup filling as an example. This method uses the basic principle of pure gravity. Under normal pressure, the liquid flows into the glass bottle by its own weight. Similar to white wine, milk, vinegar, etc., which can flow freely, and there is no gas-containing liquid, this method can be used for filling. .
2 Isobaric filling method
The isobaric filling method is shown in the figure below. This method adopts the basic principle of the The isobaric filling method adopts the basic principle of combining pressure and gravity. In order to ensure the equal pressure between the glass bottle and the liquid storage tank, the glass bottle needs to be inflated, and then the liquid flows into the glass bottle by its own weight, similar to beer, soda, etc. Free-flowing and carbonated beverages can be filled with this method, which can effectively prevent the loss of carbon dioxide from these beverages and maintain the quality and quantitative accuracy of the beverages.
3 vacuum filling method
The basic principle of this method is to reduce the air pressure of the glass bottle to make it lower than the atmospheric pressure. There are two common types of differential pressure vacuum type and gravity vacuum type. A pressure difference is formed with the liquid storage tank, and the liquid flows into the glass bottle by the pressure difference. The latter is the vacuum of the liquid storage tank itself. The method is suitable for liquids with relatively high viscosity such as syrups and oils, as well as liquid materials containing vitamins and toxic materials, which can prolong the shelf life of liquids and reduce the leakage of toxic gases.
4 Pressure filling method
The basic principle of this method is to squeeze the liquid into the glass bottle by using air pressure or The basic principle of this method is to use air pressure or mechanical pressure to squeeze the liquid into the glass bottle. Filling efficiency, but will slightly affect the filling quality.
The above filling methods are selected according to the viscosity, gas content, volatility, and shelf life of the liquid. That is to say, the basic principle of the automatic glass bottle filling machine is determined according to the nature of the filling material itself. In order to improve the shelf life of beverages without gas such as milk, it is required that the filling method used can reduce the oxygen content in the glass bottle.