Natural Latex

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Natural latex, or natural rubber latex, for example, is a complex emulsion consisting of alkaloids, starches, sugars, oils, proteins, tannins, resins, and gums that coagulate on exposure to air—the stuff that natural chemistry cooks up every day. Natural Rubber Latex looks like white sap and can be extracted from a variety of trees.
www.kentelastomer.com/natural-rubber-nat…
Natural latex comes from the milky sap harvested from the rubber tree (Hevea Brasiliensis). Rubber trees allegedly originated in Brazil, but were planted across the globe and now are mainly found in the tropics of South East Asia and Africa.
www.heveya.com/heveya-media/articles/49 …
What ' s The difference between synthetic and natural latex?
What ' s The difference between synthetic and natural latex?
Natural latex is made of rubber tree sap. The sap is harvested and baked into cozy layers of latex which are then used inside mattresses, pillows, sofas, and more. Keep in mind that some brands use a blend of natural and synthetic latex so make sure you opt for truly natural latex that doesn’t have any unnecessary additives.
savvyrest.com/blog/what-natural-latex-it-to…
100% natural latex – if you want a pure natural latex mattress, make sure you ask the salesman on the mattress composition and whether it is made with 100% natural latex without any added fillers. Proper certifications like the Oko-Tex standard or GOLS, both of which guarantee the eco-friendliness and safety of your mattress.
www.heveya.com/heveya-media/articles/49 …
Эксклюзивные подушки из 100% натурального латекса с добавлением активированного угля для взрослых и детей. Экологически-чистый продукт и уникальные свойства природного латекса …
https://savvyrest.com/blog/what-natural-latex-it-toxic
Перевести · What is natural latex? Natural latex is made of rubber tree sap. The sap is harvested and baked into cozy layers of latex which are then used inside mattresses, pillows, sofas, and more. Keep in mind that some brands use a blend of natural and synthetic latex so make sure you opt for truly natural latex that doesn’t have any unnecessary additives.
https://savvyrest.com/blog/myth-100-natural-latex
Перевести · What is Natural Latex? Natural latex is made exclusively from rubber tree sap. This means that it does not contain any …
https://www.kentelastomer.com/natural-rubber-natural-rubber-latex
Перевести · 07.10.2017 · Natural latex, or natural rubber latex, for example, is a complex emulsion consisting of alkaloids, starches, sugars, oils, proteins, …
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https://www.heveya.com/heveya-media/articles/49-organic-vs-natural-latex
Перевести · Natural latex comes from the milky sap harvested from the rubber tree (Hevea Brasiliensis). Rubber trees allegedly originated in Brazil, but were planted across the globe and now are mainly found in the tropics of South East Asia and Africa. Rubber …
https://www.math-linux.com/latex-26/faq/latex-faq/article/latex-natural-numbers
Перевести · N N is the set of natural numbers. You will have noticed that in recent books, we use a font that is based on double bars, this notation is actually derived from the writing of classic sets on the blackboard: indeed, on the blackboard we do not fill these sets, or it would take a ton of chalk !!! In Latex, …
https://en.wikipedia.org/wiki/Natural_rubber
More than 28 million tons of rubber were produced in 2017, of which approximately 47% was natural. Since the bulk is synthetic, which is derived from petroleum, the price of natural rubber is determined, to a large extent, by the prevailing global price of crude oil. Asia was the main source of natural rubber, accounting for about 94% of output in 2005. The three largest producers, Thail…
More than 28 million tons of rubber were produced in 2017, of which approximately 47% was natural. Since the bulk is synthetic, which is derived from petroleum, the price of natural rubber is determined, to a large extent, by the prevailing global price of crude oil. Asia was the main source of natural rubber, accounting for about 94% of output in 2005. The three largest producers, Thailand, Indonesia and Malaysia, together account for around 72% of all natural rubber production. Natural rubber is not cultivated widely in its native continent of South America due to the existence of South American leaf blight, and other natural predators.

Cultivation
Rubber latex is extracted from rubber trees. The economic life period of rubber trees in plantations is around 32 years, up to 7 years of immature phase and about 25 years of productive phase.

The soil requirement is well-drained, weathered soil consisting of laterite, lateritic types, sedimentary types, nonlateritic red or alluvial soils.

The climatic conditions for optimum growth of rubber trees are:
• Rainfall of around 250 centimetres (98 in) evenly distributed without any marked dry season and with at least 100 rainy days per year
• Temperature range of about 20 to 34 °C (68 to 93 °F), with a monthly mean of 25 to 28 °C (77 to 82 °F)
• Atmospheric humidity of around 80%
• About 2,000 hours sunshine per year at the rate of six hours per day throughout the year
• Absence of strong winds

Many high-yielding clones have been developed for commercial planting. These clones yield more than 2,000 kilograms per hectare (1,800 lb/acre) of dry rubber per year, under ideal conditions.

Collection
In places such as Kerala and Sri Lanka, where coconuts are in abundance, the half shell of coconut was used as the latex collection container. Glazed pottery or aluminium or plastic cups became more common in Kerala and other countries. The cups are supported by a wire that encircles the tree. This wire incorporates a spring so it can stretch as the tree grows. The latex is led into the cup by a galvanised "spout" knocked into the bark. Tapping normally takes place early in the morning, when the internal pressure of the tree is highest. A good tapper can tap a tree every 20 seconds on a standard half-spiral system, and a common daily "task" size is between 450 and 650 trees. Trees are usually tapped on alternate or third days, although many variations in timing, length and number of cuts are used. "Tappers would make a slash in the bark with a small hatchet. These slanting cuts allowed latex to flow from ducts located on the exterior or the inner layer of bark (cambium) of the tree. Since the cambium controls the growth of the tree, growth stops if it is cut. Thus, rubber tapping demanded accuracy, so that the incisions would not be too many given the size of the tree, or too deep, which could stunt its growth or kill it."

It is usual to tap a pannel at least twice, sometimes three times, during the tree's life. The economic life of the tree depends on how well the tapping is carried out, as the critical factor is bark consumption. A standard in Malaysia for alternate daily tapping is 25 cm (vertical) bark consumption per year. The latex-containing tubes in the bark ascend in a spiral to the right. For this reason, tapping cuts usually ascend to the left to cut more tubes. The trees drip latex for about four hours, stopping as latex coagulates naturally on the tapping cut, thus blocking the latex tubes in the bark. Tappers usually rest and have a meal after finishing their tapping work, then start collecting the liquid "field latex" at about midday.

Field coagula
The four types of field coagula are "cuplump", "treelace", "smallholders' lump" and "earth scrap". Each has significantly different properties. Some trees continue to drip after the collection leading to a small amount of "cup lump" that is collected at the next tapping. The latex that coagulates on the cut is also collected as "tree lace". Tree lace and cup lump together account for 10%–20% of the dry rubber produced. Latex that drips onto the ground, "earth scrap", is also collected periodically for processing of low-grade product.

Cup lump is the coagulated material found in the collection cup when the tapper next visits the tree to tap it again. It arises from latex clinging to the walls of the cup after the latex was last poured into the bucket, and from late-dripping latex exuded before the latex-carrying vessels of the tree become blocked. It is of higher purity and of greater value than the other three types.

Tree lace is the coagulum strip that the tapper peels off the previous cut before making a new cut. It usually has higher copper and manganese contents than cup lump. Both copper and manganese are pro-oxidants and can damage the physical properties of the dry rubber.

Smallholders' lump is produced by smallholders, who collect rubber from trees far from the nearest factory. Many Indonesian smallholders, who farm paddies in remote areas, tap dispersed trees on their way to work in the paddy fields and collect the latex (or the coagulated latex) on their way home. As it is often impossible to preserve the latex sufficiently to get it to a factory that processes latex in time for it to be used to make high quality products, and as the latex would anyway have coagulated by the time it reached the factory, the smallholder will coagulate it by any means available, in any container available. Some smallholders use small containers, buckets etc., but often the latex is coagulated in holes in the ground, which are usually lined with plastic sheeting. Acidic materials and fermented fruit juices are used to coagulate the latex — a form of assisted biological coagulation. Little care is taken to exclude twigs, leaves, and even bark from the lumps that are formed, which may also include tree lace.

Earth scrap is material that gathers around the base of the tree. It arises from latex overflowing from the cut and running down the bark, from rain flooding a collection cup containing latex, and from spillage from tappers' buckets during collection. It contains soil and other contaminants, and has variable rubber content, depending on the amount of contaminants. Earth scrap is collected by field workers two or three times a year and may be cleaned in a scrap-washer to recover the rubber, or sold to a contractor who cleans it and recovers the rubber. It is of low quality.

Processing
Latex coagulates in the cups, if kept for long and must be collected before this happens. The collected latex, "field latex", is transferred into coagulation tanks for the preparation of dry rubber or transferred into air-tight containers with sieving for ammoniation. Ammoniation preserves the latex in a colloidal state for longer periods of time. Latex is generally processed into either latex concentrate for manufacture of dipped goods or coagulated under controlled, clean conditions using formic acid. The coagulated latex can then be processed into the higher-grade, technically specified block rubbers such as SVR 3L or SVR CV or used to produce Ribbed Smoke Sheet grades. Naturally coagulated rubber (cup lump) is used in the manufacture of TSR10 and TSR20 grade rubbers. Processing for these grades is a size reduction and cleaning process to remove contamination and prepare the material for the final stage of drying.

The dried material is then baled and palletized for storage and shipment.

Vulcanized rubber
Natural rubber is often vulcanized - a process by which the rubber is heated and sulfur, peroxide or bisphenol are added to improve resistance and elasticity and to prevent it from perishing. Carbon black is often used as an additive to rubber to improve its strength, especially in vehicle tires, which account for about 70% (~9 million tons) of carbon black production.

Transportation
Natural rubber latex is shipped from factories in Southeast Asia, South America, and West and Central Africa to destinations around the world. As the cost of natural rubber has risen significantly and rubber products are dense, the shipping methods offering the lowest cost per unit weight are preferred. Depending on destination, warehouse availability, and transportation conditions, some methods are preferred by certain buyers. In international trade, latex rubber is mostly shipped in 20-foot ocean containers. Inside the container, smaller containers are used to store the latex.
РекламаКосметические средства от Be Natural (США). Гарантия качества! Доставка по Москве! · Москва · круглосуточно
Рекламаиз Тайланда от производителя PATEX. Представительство в России. · Москва · 20430 · круглосуточно
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