Food stuff producers usually deal with liquid. Soft or alcoholic drinks need to be placed in protected containers to maintain the freshness of the product. This is also true with other liquid foodstuffs such as soup or even solids which end up in containers and pouches such as rice and pasta. Ready canned food and cooking sauces in glasswares also fall into the liquid filling category. Liquid Filling is a complex process and for it to be done properly it should be overseen by someone like www.wyepak.co.uk/filling-packing-services/liquid-filling/.
When considering liquid filling one has to take in the chemical nature of the liquid itself. Firstly, liquid is a viscous material. The degree of its viscosity is in relation to basically how runny or how thick it is. For example, fruit juice has less viscosity than a Bolognese sauce. In practical terms what this means for the company responsible for filling the container is that certain pressures and changeable pumps may be required depending on the viscosity of the liquid involved.
The other difficulty is that some liquids have a tendency to begin to foam if they are moved at Great speed or exposed to the atmosphere. Again this is where specialist equipment is required to ensure that the product does not reach this point with a fast filling of the particular container before the product is able to realise it has been moved at speed and through the air.