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External vacuum sealers involve a bag being attached to the vacuum-sealing machine externally. The machine will remove the air and seal the bag, which is all done outside the machine. A heat sealer is often used to seal the pack. Typically these units use a dry piston vacuum pump which is often considered a "maintenance-free" pump.
Ziploc has expanded their products to more than just sandwich bags. Ziploc products have varied from freezer bags to Twist 'n Loc containers, the latter now discontinued. They have expandable bottom bags that stand on their own. The now-discontinued polypropylene Zip 'n Steam bags were used to cook food in a microwave oven. They also have had ...
Torr-Seal, or its generic equivalent Hysol-1C (US brand name) or Loctite 9492 (EU brand name), is an epoxy with resin and hardener for use in vacuum environments. It will begin to degrade at high temperatures but otherwise is very stable with very little outgassing. Other vacuum-rated epoxies are also available.
In 1998, a study measured the migration of non-volatile and volatile compounds from oven bags to chicken. As much as 16% of the nylon from microwave and roasting bags were observed in the chicken after roasting at 200 °C (392 °F) for two hours and as much as 0.08% of the total 2-cyclopentyl cyclopentanone content in the bags were observed. [4]
The zip is bonded to the packaging by a heat activated adhesive that is pre-applied to the backing of the zip. The first resealable packaging with a zipper was licensed in the United States by Minigrip® in 1954. "Ziplock" is now used as a noun or adjective in relation to plastic bags using this type of seal regardless of manufacturer. [2]
A Ziploc-branded storage bag Close-up from a cross section of the sealing mechanism. A zipper storage bag, slider storage bag, zipper bag, zip lock bag, or zippie is an inexpensive flexible rectangular storage bag, usually transparent, made of polyethylene [1] [2] or similar plastic, that can be sealed and opened many times, either by a slider, which works in a similar way to a zip fastener ...