Heat sealers are great for increasing production capabilities that involve sealing bags, tubes, and more. Heat sealers are either an Impulse, Double Impulse or Constant-type heat. Impulse heats the wire for a set amount of time whereas the constant heat sealer is always hot. Sealers are available in hand held, table top, or stand versions.
The construction of your bag will dictate which type of sealer you will need. Impulse-type sealers generally give the best results. However, there are plenty of applications where constant heat may be preferred.