A tea bag is a small, porous, sealed bag or packet containing dried plant material, which is immersed in water to make a tea or an infusion. Classically these are tea leaves (Camellia sinensis), but the term is also used for herbal teas (tisanes) made of herbs or spices. Tea bags are commonly made of filter paper or food-grade plastic, or occasionally of silk. The bag contains the tea leaves while the tea is steeped, making it easier to dispose of the leaves, and performs the same function as a tea infuser. 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.
In countries where the use of loose tea leaves is more prevalent, the term "tea bag" is commonly used to describe paper or foil packaging for loose leaves. They are usually square or rectangular envelopes with the brand name, flavour and decorative patterns printed on them.
Packing tea in paper goes back to medieval 8th century China, during the Tang dynasty, when paper was folded and sewn into square bags to preserve tea flavoring and aromas. Then the paper tea bags were stitched from all sides to create protective casings for the tea leaves.
The first modern tea bags in the Western World were hand-sewn fabric bags; tea bag patents date as early as 1903. First appearing commercially around 1904, tea bags were successfully marketed about 1908 by the tea and coffee importer Thomas Sullivan from New York, who shipped his silk tea bags around the world. 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 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-sealed paper fiber tea bag was patented in 1930 by William Hermanson, one of the founders of Technical Papers Corporation of Boston, who sold his patent to the Salada Tea Company.
The rectangular tea bag was not invented until 1944. Prior to this, tea bags resembled small sacks.
A broad variety of teas as well as other infusions 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.
Paper and plastic
Tea bag paper is related to paper found in milk and coffee filters and is a blend of wood and vegetable fibers. The latter is bleached 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, and other bags are made from nylon. Paper tea bags are commonly sealed using polypropylene.
Removal of plastic
In 2017, Mike Armitage, a gardener in Wrexham, UK, found that tea bags left a plastic residue after being composted. 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 now use corn starch adhesive in place of polypropylene.
Tea bag manufacturing machines
A few of the leading tea bag production machine companies are MAI from Mar del Plata, Argentina; Teepack from Meerbusch, Germany; and IMA, from Bologna, Italy. A standard machine produced by the MAI company can fill 120 rectangular bags per minute containing up to 3.3 grams per bag, which allows the packaging of herbal teas. Another company, the Italian Tecnomeccanica, has a faster design capable of filling 250 tetrahedral bags per minute.
Shapes and use
Traditionally, tea bags have been square or rectangular in shape. More recently circular and tetrahedral bags have come on the market and are often claimed by their manufacturers to improve the quality of the brew. Environmentalists prefer silk to nylon because of health and biodegradability issues. Another material for tea bags is Soilon (PLA mesh), made from corn starch. 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.
The concept of pre-measured portions to be infused in disposable bags has also been applied to coffee in the form of coffee bags, although this has not achieved such wide acceptance as tea bags.
Decorative tea bag labels have become the basis for large collections and many collectors collect tea bags from around the world.
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 gift cards and it has become a popular craft in both the US and UK since 2000.
- 3-MCPD, a chemical compound that is carcinogenic, and can occur in some resin-reinforced tea bag materials
- Builder's tea, refers to a basic method of preparing tea in a mug with tea bags
- 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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