VFFS Vertical Form/Fill/Seal
Vertical Form / Fill / Seal is when it makes sense to drop the product rather than push it as in Horizontal Form / Fill / Seal HFFS flow wrapping.
Click here for explanation of both processes and a troublshooting guide for VFFS.
The bag is formed by folding a sheet of film into a tube with what is known as a "forming cone ". Next a seal is made at the bottom of the nascent tube. The product is dropped in followed by a seal at the top to create a bag.
There are two types of sealing jaws known as " resistance " and " impulse ".
Resistance jaws are bare metal. They require multilayer films ( either coextruded or laminated ) with a difference in seal temperatures. Impulse jaws are a nichrome wire with teflon tape over it. Monolayer films can run on impulse jaws.
Pinhole free packages can only be achieved with resistance jaws and multilayer films.