External suction vacuum sealers have been designed by Orved as a low-cost alternative to chamber vacuum packing. The machines, which are of stainless steel construction, comprise a vacuum pump which sucks air out of a pouch from outside the appliance and a heat seal beam. Most external suction vacuum sealers work by drawing air from embossed (or sometimes called channelled or ribbed) vacuum pouches by placing the open end of the pouch underneath a lid, withdrawing the air and then heat sealing the pouch. The pouch works in conjunction with the machine to typically create an 80% vacuum but some more powerful machines have similar air reduction capabilities as a chamber machine. Other appliances, equipped with a retractable vacuum wire (or probe), can use plain bags or even metallized bags.
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