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Revision as of 19:22, 9 March 2007 by Naniwako (talk | contribs) (→Flax seed)(diff) ← Previous revision | Latest revision (diff) | Newer revision → (diff) For other uses, see Flax (disambiguation).
| Flax | |
|---|---|
| |
| Common Flax | |
| Scientific classification | |
| Kingdom: | Plantae |
| Division: | Magnoliophyta |
| Class: | Magnoliopsida |
| Order: | Malpighiales |
| Family: | Linaceae |
| Genus: | Linum |
| Species: | L. usitatissimum |
| Binomial name | |
| Linum usitatissimum Linnaeus. | |
Flax (also known as Common Flax or Linseed) is a member of the genus Linum in the family Linaceae. The New Zealand flax is unrelated. Flax originated in India and was first domesticated in the Fertile Crescent.
It is an erect annual plant growing to 120 cm tall, with slender stems. The leaves are glaucous green, slender lanceolate, 2-4 cm long and 3 mm broad. The flowers are pure pale blue, 1.5-2.5 cm diameter, with five petals. The fruit is a round, dry capsule 5-9 mm diameter, containing several glossy brown seeds shaped like an apple pip, 4-7 mm long.
In addition to the plant itself, flax may refer to the unspun fibres of the flax plant.
Uses
Flax is grown both for seed and for its fibers. Various parts of the plant have been used to make fabric, dye, paper, medicines, fishing nets and soap. It is also grown as an ornamental plant in gardens, as flax is one of the few plant species capable of producing truly blue flowers (most "blue" flowers are really shades of purple), although not all flax varieties produce blue flowers.
Flax seed
The seeds produce a vegetable oil known as linseed oil or flaxseed oil. It is one of the oldest commercial oils and solvent-processed flax seed oil has been used for centuries as a drying oil in painting and varnishing.
Flax seeds come in two basic varieties; brown and yellow (also referred to as golden). Although brown flax can be consumed and has been for thousands of years, it is better known as an ingredient in paints, fibre and cattle feed. Brown and yellow flax have similar nutritional values and equal amounts of short-chain omega-3 fatty acids. The exception is a type of yellow flax called solin which is very low in omega-3 and has a completely different oil profile. A number of studies have shown that people have a very hard time absorbing the Omega-3 from flaxseed oil compared to oily fish (see Fish and plants as a source of Omega-3 for more).
A North Dakota State University research project led to the creation of a new variety of the yellow flax seed called "Omega." This new variety was created primarily as a food source and has a more pleasant nutty-buttery flavour than the brown variety and retains a comparable level of the beneficial Omega-3 oil.
One tablespoon of ground flax seeds and three tablespoons of water may serve as a replacement for one egg in baking by binding the other ingredients together. Ground flax seeds can also be mixed in with oatmeal, yogurt, water (similar to Metamucil), or any other food item where a nutty flavour is appropriate. Flaxseed oil is most commonly consumed with salads or in capsules. Flax seed owes its nutritional benefits to lignans and omega-3 essential fatty acids. Omega-3s, often in short supply in populations with low-fish diets, promote heart health by reducing cholesterol, blood pressure and plaque formation in arteries. In addition, flaxseed oil is often recommended as a galactagogue.
Lignans benefit the heart and possess anti-cancer properties: A series of research studies by Lilian U. Thompson and her colleagues at the Department of Nutritional Science of the University of Toronto have reported that flaxseed can have a beneficial effect in reducing tumour growth in mice, particularly the kind of tumour found in human post-menopausal breast cancer. The effects are thought to be due to the lignans in flaxseed, and are additive with those of tamoxifen, the currently standard drug treatment for these cancers. Initial studies suggest that flaxseed taken in the diet have similar beneficial effects in human cancer patients. Reports that flaxseed is beneficial in other cancers, e.g., prostate cancer, are less numerous but promising.
Flax seed sprouts are edible, with a slightly spicy flavour.
Flaxseed is also known as linseed. Flaxseeds are known as San, Alsi in Hindi, Gujarati, and Punjabi, Ali Vidai in Tamil. In Marathi, it is also known as Jawas and Alashi. In Bengali, it is known as Tishi, In Oriya it is called Pesi. In Kannada, it's called Agasi. The Telugu people call it Avise ginzalu. Finally, in Kerala, the Malayalis call it Cheruchana vithu.
Flax fibre
Flax fibres are amongst the oldest fibre crops in the world. The use of flax for the production of linen goes back 5000 years. Pictures on tombs and temple walls at Thebes depict flowering flax plants. The use of flax fibre in the manufacturing of cloth in northern Europe dates back to Neolithic times. In North America, flax was introduced by the Pilgrim fathers. Currently most flax produced in the USA and Canada are seed flax types for the production of linseed oil or flaxseeds for human nutrition.
Flax fibre is extracted from the bast or skin of the stem of flax plant. Flax fibre is soft, lustrous and flexible. It is stronger than cotton fibre but less elastic. The best grades are used for linen fabrics such as damasks, lace and sheeting. Coarser grades are used for the manufacturing of twine and rope. Flax fibre is also a raw material for the high-quality paper industry for the use of printed banknotes and rolling paper for cigarettes.
Flax mills
Main article: Flax millFlax mills for spinning flaxen yarn were invented by John Kendrew (inventor) and Thomas Porthouse of Darlington in 1787.
Cultivation
The major fibre flax-producing countries are the former USSR, Poland, France, Belgium, Ireland, and the Czech Republic.
The soils most suitable for flax, besides the alluvial kind, are deep friable loams, and containing a large proportion of organic matter. Heavy clays are unsuitable, as are soils of a gravelly or dry sandy nature.
Flax is harvested for fibre production after aproximately 100 days, when the base of the plant begins to turn yellow, if the plant is still green the seed will not be useful, and the fiber will be underdeveloped, and the fiber degrades once the plant is brown; it is pulled up with the roots (not cut), so as to maximise the fibre length. After this the flax is allowed to dry, the seeds are removed, and is then retted.
Flax grown for seed is allowed to mature until the seed capsules are yellow and just starting to split; it is then harvested by combine harvester and dried to extract the seed.
Threshing flax
Threshing is the process of removing the seeds from the rest of the plant.
The process is divided into two parts: the first part is intended for the farmer, or flax-grower, to bring the flax into a fit state for general or common purposes. This is performed by three machines: one for threshing out the seed, one for breaking and separating the wood from the fibre, and one for further separating the broken wood and matter from the fibre. In some cases the farmers thrash out the seed in their own mill and therefore, in such cases, the first machine will be unnecessary.
The second part of the process is intended for the manufacturer to bring the flax into a state for the very finest purposes, such as lace, cambric, damask, and very fine linen. This second part is performed by the refining machine only.
The threshing process would be conducted as follows:
- Take the flax in small bundles, as it comes from the field or stack, and holding it in the left hand, put the seed end between the threshing machine and the bed or block against which the machine is to strike; then take the handle of the machine in the right hand, and move the machine backward and forward, to strike on the flax, until the seed is all threshed out.
- Take the flax in small handfuls in the left hand, spread it flat between the third and little finger, with the seed end downwards, and the root-end above, as near the hand as possible.
- Put the handful between the beater of the breaking machine, and beat it gently till the three or four inches, which have been under the operation of the machine, appear to be soft.
- Remove the flax a little higher in the hand, so as to let the soft part of the flax rest upon the little finger, and continue to beat it till all is soft, and the wood is separated from the fibre, keeping the left hand close to the block and the flax as flat upon the block as possible.
- The other end of the flax is then to be turned, and the end which has been beaten is to be wrapped round the little finger, the root end flat, and beaten in the machine till the wood is separated, exactly in the same way as the other end was beaten.
Diseases
Main article: List of flax diseases
Preparation for spinning
Before the flax fibers can be spun into linen, they must be seperated from the rest of the stalk. The first step in this process is called "retting". Retting is the process of rotting away the inner stalk, leaving the outer fibres intact. At this point there is still straw, or corse fibers, remaining. To remove these the flax is "broken", the straw is broken up into small, short bits, while the actual fiber is left unharmed, then "scutched", where the straw is scraped away from the fiber, and then pulled through "hackles", which act like combs and comb the straw out of the fiber.
Retting Flax
There are several methods of retting flax. It can be retted in a pond, stream, field or a container. When the retting is complete the bundles of flax feel soft and slimy, and quite a few fibres are standing out form the stalks. When wrapped around a finger the inner woody part springs away from the fibres.
Pond retting is the fastest. It consists of placing the flax in a pool of water which will not evaporate. It generally takes place in a shallow pool which will warm up dramatically in the sun; the process may take from only a couple days to a couple weeks. Pond retted flax is traditionally considered lower quality, possibly because the product can become dirty, and easily over-retts, damaging the fiber. This form of retting also produces quite an odor.
Stream retting is similar to pool retting, but the flax is submerged in bundles in a stream or river. This generally takes longer than pond retting, normally a two or three weeks, but the end product is less likely to be dirty, does not stink as much, and because the water is cooler it is less likely to be over-retted.
Both Pond and Stream retting were traditionally used less because they pollute the waters used for that process.
Field retting is laying the flax out in a large field, and allowing dew to collect on it. This process normally takes a month or more, but is generally considered to provide the highest quality flax fibers, and produces the least pollution.
Retting can also be done in a plastic trash can, or any type of water tight container of wood, concrete, earthenware or plastic. Metal containers will not work, as an acid is produced when retting, and it would corrode the metal. If the water temperature is kept at 80 °F, the retting process under these conditions takes 4 or 5 days, and if the water is any colder it takes longer. Scum will collect at the top, and an odor is given off, like in pond retting.
Dressing the flax
Dressing the flax is the term given to removing the straw from the fibers. It consists of three steps, breaking, scutching, and heckleing. The breaking breaks up the straw, then some of the straw is scraped from the fibers in the scutching process, then the fiber is pulled through heckles to remove the last bits of straw.
The dressing is done as follows:
- Breaking The process of breaking breaks up the straw into short segments. To do it, take the bundles of flax and untie them. Next, in small handfuls, put it between the beater of the breaking machine ( a set of wooden blades which mesh together when the upper jaw is lowered- it looks like a paper cutter but instead of having a big knife it has a blunt arm), and beat it till the three or four inches that have been beaten appear to be soft. Move the flax a little higher and continue to beat it till all is soft, and the wood is separated from the fibre. When half of the flax is broken, hold the beaten end and beat the rest in the same way as the other end was beaten, till the wood is separated.
- Scutching In order to remove some of the straw from the fibre, it helps to swing a wooden scutching knife down the fibres while they hang vertically, thus scraping the edge of the knife along the fibres and pull away pieces of the stalk. Some of the fibre will also be scutched away, this cannot be helped and is natural.
- Hackles In this process the fibre is pulled through various different sized hackles. A hackle is a bed of "nails"- sharp, long-tapered, tempered, polished steel pins driven into wooden blocks at regular spacing. A good progression is from 4 pins per square inch, to 12, to 25 to 48 to 80. The first three will remove the straw, and the last two will split and polish the fibres. Some of the finer stuff that comes off in the last hackles can be carded like wool and spun. It will produce a coarser yarn than the fibres pulled through the heckles because it will still have some straw in it.
Trivia
- Common flax is the national flower of Belarus.
- Flax is the emblem of the Northern Ireland Assembly.
- The flax plant, in a coronet, appeared on the reverse of the British one pound coin to represent Northern Ireland on coins minted in 1986 and 1991.
- In English, blond hair is traditionally referred to as "fair" or "flaxen".
- Flax seeds are an alchemical ingredient in the game The Elder Scrolls IV: Oblivion
- Flax is spun in RuneScape to create bowstrings.
References
- Alister D. Muir, Neil D. Westcot, ""Flax: The Genus Linum""., page 3 (August 1, 2003)
- Miller, J.F., J.J. Hammond, and G.D. Statler. (1992). "Registration of 'Omega' Flax". Crop Science. 32: 1065.
{{cite journal}}: CS1 maint: multiple names: authors list (link) - A. J. Wardey, The linen trade: ancient and modern (1864; repr. 1967), 690-92.
- USDA profile of flax
- The 1881 Household Cyclopedia
- Chen, J. M., Wang, L., & Thompson, L. U. (2006). Flaxseed and its components reduce metastasis after surgical excision of solid human breast tumor in nude mice. Cancer Letters, 234, 168-175.
- Thompson, L. U., Chen, J. M., Li, T., Strasser-Weippl, K., & Goss, P. E. (2005). Dietary flaxseed alters tumor biological markers in postmenopausal breast cancer. Clinical Cancer Research, 11, 3828-3835.
- Alternative Field Crops Manual: Flax
- Flax Council of Canada Guide to Growing Flax
- Health Benefits of ground flax seeds from World's Healthiest Foods site