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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 ...
Ziploc and Zip-Pak are manufacturers specializing in these products, the latter employing a slider to open and close the bag. [1] The zip component of the packaging is supplied on a continuous roll, and is inserted between the upper and lower webs of the plastic film provided with the packaging.
Ziploc faces strong competition from such competitors as Glad, Hefty, and many privately owned, generic, store brand plastic bags and containers. As Jules Rose, chairman of Sloan's Supermarkets Inc. in New York City, states: "This is a highly competitive market with a lot of players and unusually strong private label sales."
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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.
Dow Chemical has begun to shed commodity chemical businesses, such as those making the basic ingredients for grocery bags and plastic pipes, because their profit margins only average 5–10%. [ citation needed ] Dow is, as of 2015, focusing its resources on specialty chemicals that earn profit margins of at least 20%.