A tea bag (or teabag) is a small, porous, sealed bag or packet typically containing tea leaves ( Camellia sinensis) or the leaves of other herbs, which is immersed in water to steeping and make an infusion. Originally used only for making tea, they are now made for other herbal tea (herbal "teas") as well.
Tea bags are commonly made of filter paper or food-grade plastic, or occasionally of silk cotton or silk. The tea bag performs the same function as a tea infuser. Tea bags can be used multiple times until there is no extraction left. Some tea bags have an attached piece of string with a paper label at the top that assists in removing the bag, while also displaying the brand or variety of tea. There are also special tea filters that can be used to pour loose tea into and brew it in a bag in a cup.
History
Tea bag patents date from 1903, when Roberta Lawson and Mary McLaren, of Milwaukee, Wisconsin, were granted US patent 723287 for a Tea Leaf Holder, which they had filed in 1901.
[ US patent 723287 was issued on MAR. 24, 1903 to R. G.LAWSON & M. McLAREN for a 'novel tea-holding pocket constructed of open-mesh woven fabric, inexpensively made of cotton thread'.] The first modern tea bags were hand-sewn fabric bags. Appearing commercially around 1904, tea bags were successfully marketed in about 1908 by Thomas Sullivan, a tea and coffee importer from New York, who shipped his silk tea bags around the world.
A popular legend states that this was accidental; the loose tea was intended to be removed from the bags by customers, but they found it easier to brew the tea with the tea leaves still enclosed in the porous bags.
The first tea bag packing machine was invented in 1929 by
Adolf Rambold for the German company Teekanne.
The heat sealer paper fiber tea bag was patented in 1930 by William Hermanson.[Dubrin, Beverly (2010). Tea Culture: History, Traditions, Celebrations, Recipes & More. Charlesbridge Publishing, p. 35. ]
Production
Teas
A broad variety of teas as well as other
, like herbal teas, are available in tea bags. Typically, tea bags use
fannings, the left-overs after larger leaf pieces are gathered for sale as loose tea, but some companies sell teabags containing whole-leaf tea.
Shapes and material
Traditionally, tea bags have been square or rectangular in shape. They are usually made of
filter paper, a blend of wood and
vegetable fibre related to paper found in milk and
. The latter is
pulp
abaca hemp, a
plantation banana plant grown for its fiber, mostly in the Philippines and Colombia. Some bags have a heat-sealable
thermoplastic such as
PVC or
polypropylene as a component fiber on the inner tea bag surface, making them not fully biodegradable.
Some newer paper tea bags are made in a circular shape.
Tetrahedral tea bags were introduced by the PG Tips brand in 1997.
Empty tea bags are also available for consumers to fill with tea leaves themselves. These are typically open-ended pouches with long flaps. The pouch is filled with an appropriate quantity of leaf tea and the flap is closed into the pouch to retain the tea. Such tea bags combine the ease of use of a commercially produced tea bag with the wider tea choice and better quality control of loose leaf tea.
Plastics
In 2017, Mike Armitage, a gardener in
Wrexham, UK, found that tea bags left a plastic residue after being
. He started a petition urging
Unilever to remove plastic from bag production.
In January 2018,
Co-op Food announced that they were removing plastic from their own brand 99 tea bags in conjunction with their supplier
Typhoo.
In February 2018,
PG Tips announced that their pyramid bags would now use
corn starch adhesive in place of
polypropylene.
Microplastics may be found in the tea meant for human consumption. A 2019 study showed that "steeping a single plastic teabag at brewing temperature () releases approximately 11.6 billion microplastics and 3.1 billion nanoplastics into a single cup of the beverage".
Recreational and practical applications
Decorative tea bags have become the basis for large collections and many collectors collect tea bags from around the world. Tea bag collector clubs are widely spread around the world and members consist of people interested in items related to teas. Online collector clubs often include catalogs of tea bags,
Teabag folding began in the Netherlands and is often credited to Tiny van der Plas. It is a form of origami in which identical squares of patterned paper (cut from the front of tea bag wrappers) are folded, and then arranged in rosettes. These rosettes are usually used to decorate , and it has become a popular craft in both the US and UK since 2000.
Soil science have used standardized tea bags to measure the decomposition rate of organic materials in different soils.
See also
-
3-MCPD, a chemical compound that is carcinogenic, and can occur in some resin-reinforced tea bag materials
-
Builder's tea, a variety of strong black tea typically prepared by steeping a tea bag in a mug
-
Melitta 401 and Melitta 402 tea filters
-
Tea leaf grading
-
Tea strainer, a small mesh utensil that can filter out stray tea leaves when whole-leaf tea is poured from a teapot
-
Tetley, the British tea company that introduced tea bags in the United Kingdom in 1953
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