Filling reusable and resealable stand up pouches at home is pretty straightforward. You can use kitchen utensils such as a glass, a bowl, or a jug to pour a product from the container into an empty stand up pouch. The stand up pouch can then be resealed. If the stand up bag is not resealable, it will be kept open (you can try sealing it with a home iron, but we wouldn't recommend it).
As simple as it is for someone occasionally filling a stand up pouch for personal use, the commercial techniques to fill and seal stand up bags are numerous and complex. Many manufacturers jealously guard their stand up pouch bags filling techniques, lest they fall into the hands of their competitors. Some manufacturers have even patented their pouch filling techniques to prevent others from copying them. Therefore it is very hard to know how different manufacturers fill stand up pouches. Nonetheless it is possible to have a general idea of the technique they use.
Most modern manufacturers of stand up pouches use automated machines to fill and seal stand up bags. The job of human operators is mostly limited to input data. This data may be related to the size, shape, and color of the stand up pouch. Depending on the manufacturer, the data may include less than five to more than a dozen variables. Another part of the job of human operators is to keep an eye on automated machines and to check they are doing their job well.
In a lot of these automated machines, a conveyor belt picks up stand up pouches from a large container. Once on the conveyor belt, an automated robotic arm sucks open the mouth of the pouch. This opened pouch is ready to accept the product. After traveling a fixed distance, the pouch with the opened mouth comes underneath a nozzle which pumps a liquid or a solid product into it. Once filled, the pouch is sent to a sealing machine which heat seals the pouch to make it ready for packaging and sending to a store. All this happens without any human interference.
The exact process differs from product to product and manufacturer to manufacturer. The nozzle used in packaging liquids cannot be the same as the nozzle used to package cereals. The process of opening the mouth of a pouch and sealing it may also use different machines. The best method to know the exact details is to visit the facility of a standup pouch manufacturer.
