The most important principle of filling machines is measuring the products or generally the matter. You certainly are not interested in selling your commodities in bulk; you would want your products to be sold in measured amounts, like in 1 liter or 1/5 kilo or any other units no matter if it’s solid or liquid.
Therefore, you need a machine to measure, fill, package and prepare your commodities in any amount you’d like; and this is the most significant principle of filling machines.