Liquid filling machine is mainly a small category of products in the packaging machine, from the packaging of materials can be divided into liquid filling machine, paste filling machine, powder filling machine, particle filling machine;From the degree of automation of production is divided into semi-automatic filling machine and automatic filling production line.The following are three filling methods for liquid filling:
(1) atmospheric pressure
Normal pressure method is also called pure gravity method, that is, under normal pressure, liquid material flow into the packaging container by self-weight.Most of the free flowing non-gas-liquid materials can be filled by this method, such as white wine, fruit wine, milk, soy sauce, vinegar, etc.
(2) 圧 method, etc
Equal pressure method, also known as pressure gravity filling method, is under the condition of high pressure, the packing container is first inflated, and the liquid filling machine makes it form the same pressure as the liquid storage tank, and then flow into the packing container depending on the self-weight of the filling material.This method is commonly used for filling aerated beverages, such as beer.This filling method can reduce the loss of CO2 contained in this kind of products, and can prevent the excessive bubbles in the filling process and affect the quality and quantitative precision of products.
(3) the method of vacuum
Vacuum method is used for filling under the condition of lower than atmospheric pressure, which can be carried out in two ways:
A. differential pressure vacuum type
That is to say, the liquid storage tank is under normal pressure, and only the packaging container is pumped to form a vacuum. The liquid and material are filled by relying on the pressure difference between the liquid and material storage tank to be filled. This method is more commonly used in China.
B. gravity vacuum type
In other words, the liquid storage tank is in a vacuum packaging container, which is first pumped to form a vacuum equal to that in the liquid storage tank, and then the liquid material flows into the packaging container by its own weight, which is rarely used in China due to its complicated structure.Vacuum filling is widely used, liquid filling machine is suitable for filling slightly higher viscosity liquid materials, such as oil, syrup, etc.