This method of packaging is exclusively used for solid items which can be inserted into the filling tube and thereafter, the formed film tube. The film is fed over a hollow former for creating a tube. After a product is pushed into this tube, the latter is sealed simultaneously on its longitudinal seam using rotary fin seal wheels.
HFFS machine does make a pillow pouch; however, it is possible to adapt the machine to form gusseted bags shaped similar to a rectangular parallelepiped in order to accommodate larger sized objects. Additionally, such machines could be loaded with devices for drilling holes into the top seam for packages hung on racks, as commonly seen inside the store.
Rather than feeding a HFFS machine with a single folded and subsequently, sealed web, two webs could be fed/scaled on all four sides after the addition of the product. Using this technique, the packager has the flexibility of either using webs produced from two completely unrelated materials or the ones that are made from the same material, but with different embellishments.