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A tub is an open-top circular or oblong
A tub is an open-top circular or oblong container
A container is any receptacle or enclosure for holding a product used in storage, packaging, and transportation, including shipping.
Things kept inside of a container are protected on several sides by being inside of its structure. The term ...
. In earlier times they were made from wooden staves held together with iron hoops and were made by coopers. Modern tubs used in industry might be made from concrete, metal or plastic.
Small plastic tubs used in the home may have a separate or attached snap-on lid
A lid, also known as a cover, is part of a container, and serves as the closure or seal, usually one that completely closes the object. Lids can be placed on small containers such as tubs as well as larger lids for open-head pails and drums. S ...
or cover; some tubs may have latched lids.
Tubs are used for multiple packaging
Packaging is the science, art and technology of enclosing or protecting products for distribution, storage, sale, and use. Packaging also refers to the process of designing, evaluating, and producing packages. Packaging can be described as a co ...
applications as well as household and industrial storage.
Construction
Many tubs are made of formed thermoplastics such asPET
A pet, or companion animal, is an animal kept primarily for a person's company or entertainment rather than as a working animal, livestock, or a laboratory animal. Popular pets are often considered to have attractive appearances, intelligence, ...
polyester, polystyrene, or polypropylene. Processes of creating tubs are either thermoforming
Thermoforming is a manufacturing process where a plastic sheet is heated to a pliable forming temperature, formed to a specific shape in a mold, and trimmed to create a usable product. The sheet, or "film" when referring to thinner gauges and cert ...
or injection moulding
Injection moulding (U.S. spelling: injection molding) is a manufacturing process for producing parts by injecting molten material into a mould, or mold. Injection moulding can be performed with a host of materials mainly including metals (for ...
. Tubs can also be formed of paperboard
Paperboard is a thick paper-based material. While there is no rigid differentiation between paper and paperboard, paperboard is generally thicker (usually over 0.30 mm, 0.012 in, or 12 Inch#equivalences, points) than paper and has certain ...
, molded pulp
Molded pulp or molded fiber (also spelled as moulded pulp or moulded fibre) is a packaging material, that is typically made from recycled paperboard and/or newsprint. It is used for protective packaging or for food service trays and beverage c ...
, and aluminum.
Some tubs have special microwave features such as susceptor
A susceptor is a material used for its ability to absorb electromagnetic energy and convert it to heat (which in some cases is re-emitted as infrared thermal radiation). The electromagnetic energy is typically radiofrequency or microwave radiation ...
s
Tubs can have a heat sealed ''lidding film'' attached prior to the lid being placed on. Some tubs have a Tamper-evident band
A tamper-evident band or security ring serves as a tamper resistant or tamper evident function to a screw cap, lid, or closure. The term ''tamper-proof'' is sometimes used but is considered a misnomer given that pilfering is still technica ...
or ''security strip'' to indicate premature opening.
Several types of latches and means of lid attachment are available.
Both the body and lid of a tub can be printed or have attached labels
A label (as distinct from signage) is a piece of paper, plastic film, cloth, metal, or other material affixed to a container or product, on which is written or printed information or symbols about the product or item. Information printed dir ...
.
See also
*Cooper (profession)
A cooper is a person trained to make wooden casks, barrels, vats, buckets, tubs, troughs and other similar containers from timber staves that were usually heated or steamed to make them pliable.
Journeymen coopers also traditionally made ...
*Tupperware
Tupperware is an American home products line that includes preparation, storage, and serving products for the kitchen and home. In 1942, Earl Tupper developed his first bell-shaped container; the brand products were introduced to the public in 1 ...
*Bath tub
A bathtub, also known simply as a bath or tub, is a container for holding water in which a person or animal may bathe. Most modern bathtubs are made of thermoformed acrylic, porcelain-enameled steel or cast iron, or fiberglass-reinforced poly ...
Notes
References
* Soroka, W, "Fundamentals of Packaging Technology", IoPP, 2002, * Yam, K.L., "Encyclopedia of Packaging Technology", John Wiley & Sons, 2009, {{packaging Containers Food packaging Packaging Wood products