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A double seam is a canning process for sealing a tin can by mechanically interlocking the can body and a can end (or lid). Originally, the can end was soldered or welded onto the can body after the can was filled. [1] However, this introduced a variety of issues, such as foreign contaminants (including lead and other harmful heavy metals).
Either continuous threads (C-T) or lugs are used. Metal caps can be either preformed or in some instances, rolled on after application. Plastic caps may use several types of molded polymer. Some screw tops have multiple pieces. For example, a mason jar often has a lid with a built in rubbery seal and a separate threaded ring or band.
Some cans, such as those used for sardines, have a specially scored lid so that the user can break out the metal by the leverage of winding it around a slotted twist-key. Until the mid-20th century, some sardine tins had solder-attached lids, and the twist-key worked by forcing the solder joint apart.
Bottle Tops is a device that snaps on to most 12- and 16-ounce aluminum cans and turns them into resealable containers. It purports to also keep carbonation in the can, though that is disputed. [1] The product is currently marketed by Telebrands, one of the leading direct-response marketing companies. [2]
Plastic screw caps for bottles Tethered cap that remains attached to the bottle. Screw on closures are the most common bottle caps. They are easy to apply by a wide variety of automated equipment, or they can be applied by hand. The application torque of closures, however, must be controlled in order for the closures to perform properly in the ...
Made of food-safe silicone with a stainless steel interior, this universal frying pan lid from Made In Cookware literally has everything covered — from woks to oversized frying pans up to 12 inches.
A screw cap or closure is a common type of closure for bottles, jars, and tubes.. Common screw closures (from left to right): Plastic bottle with plastic screw cap, Dispensing closure for salad dressing (with inner seal), Break-away closure for syrup, Dispensing pump closure, Dispensing closure (with inner seal), Spray pump, Metal closure on glass jar, Child resistant closure, Cap on ...
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