Valve type bags are filled with a tube inserted in a small opening (valve) on the top corner of the bag. After filling, this valve then is closed, sealing the bag.
One advantage of using a valve type bag is that they do not require a bag sewing machine or bag sealer to close the bag.
There are three styles of valve type bags: tuck-in, sonic sealed and inner sleeve.
- Tuck-In Sleeve Valve Bags have a flap that is manually tucked in closing the bag after bag is filled.
- Sonic Sealed Valve Bags have a flap that is pressed together and heated to seal the opening. Sonic sealed valve bags are often used with fully automated bag fillers since they do not require an operator to close the bag.
- Inner Sleeve Valve Bags have an internal flap that covers the opening when the product pushes against it. This self-closing valve bag is the most commonly used valve bags and can be used with automatic bag placers.
It is important to note that the type of valve bag used will determine the configuration of the valve bag filler.