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From the Carpetinfo great helpful Web site. Take a visit.
Yarns The Blend The Fibre The Colour Meltbond Anchor Coat Heat Setting
Allergies The Latex          

Yarns
Carpets are only as good as the raw materials from which they are made and the expertise with which they are constructed.
All carpets are made with raw fibre and this is normally spun into a yarn which is then woven or tufted into a fabric that you see in the shops.
Spinning the yarn itself is a skilled job and one which has created its own specialist companies.
Carr’s is one such company.
Attention to detail and exceptional quality control standards are the secrets of perfect yarn. 
Stages in Yarn Spinning.
Carr’s use raw wool from the best British and New Zealand fleeces. This is blended together in precise proportions according to the `character’ and `handle’ of the yarn required.
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The Blend is scoured, pulled and teased (the technical term is `carded’) until it is straighter, whiter and free of natural burrs and foreign bodies
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The Fibre is systematically opened up and layered and then cross layered and eventually this web or bat is split into slubbings which are then pulled and twisted on a spinning frame which adds strength to the single strand of yarn.
Two or more of these strands are then twisted together, or `doubled’, and this results in a yarn with a high tensile strength capable of being woven or tufted by the latest high tech machinery with the maximum efficiency and at the lower production cost, thereby providing the optimum combination of quality raw materials, exceptional yarns and most economical prices.

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The Colour is introduced either at the raw fibre stage or when the yarn is spun into the thickness weight and length for the particular carpet. Thomas Carr continually invest in state-of-the-art machinery and their success is founded upon a continuous programme of research and development, designed to anticipate technical, performance and aesthetic requirements demanded by the market. The results of this investment, new yarn trends, process innovation and carpet product development are regularly introduced to the carpet market.

One of the first spinners to perceive the growing need for improved performance in the field of lasting good looks, Carr developed the process. Woolbond incorporates a small amount (up to 10%) or `low melt’ polyester, which, under normal dying temperatures, fuses with the other components to create a web like structure throughout the yarn. This improves the performance of the resultant carpet. It inhibits shedding of loose fluff contributes to better tuft definition, resilience and resistance to crushing.
Carr’s colour palette is much sought after for its clear soft shades but they have also created a growing bank of subtle heather and wool tweed effects which are providing a practical alternative to fashionable floors the world over.

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Meltbond A yarn and spinning system which incorporates a small amount of low melt fibre, usually 10% polyester, with other fibres, usually wool and nylon. The yarn is subjected to a low heat during manufacture which fuses the polyester to the adjacent fibres. This creates a web like structure through the yarn which helps to reduce the shedding of fluff and improve the long term appearance of the carpet.

There are various trade names for this and similar processes: Woolbond, Wool Loc, Tuft-Loc, Twist-Loc, Texture-Loc, Yarn-Loc, Fibre-Loc, Superbond, Fibrebond and Tuftbond.

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Anchor Coat

A latex or adhesive coating applied to the back of a carpet, usually tufted, to the tufts and prevent them pulling out.

Heat Setting

This is the process in which heat is used to set a permanent twist into the yarn. The most commonly used are:- Suessen, Superbra and autoclave. If this process has been left out, you may get a problem with pile bursting.

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Allergies and Carpet

Some people think carpeting can cause allergic reactions or other health problems.  This page is to let readers know what my research has revealed on this subject.   

The issue revolves around the emission of VOC's (volatile organic compounds).  There seems to be a misperception that carpet fibers themselves produce VOC's.  It appears that VOC's are actually found in the air of carpet manufacturing facilities and get trapped within carpeting.  VOC's are then released into the air of a home for a few days after installation (until the carpet is aired out).  These emissions are generally at a very low level, and will stop after a few days.  It seems that it has never been proven that VOC's are ever emitted at an "unsafe" level.  However, in response to complaints, the Carpet and Rug Institute began placing a green label (seen below) on carpets that pass its' test for safe VOC emission levels. 

 
Indoor air quality logo
 
In general, allergy problems do not arise from carpet itself, but from dust mites, dirt and mildew that can build up in carpet due to a lack of cleaning. 

VOC's can also be emitted by an adhesive called "seam sealer".  If this is a concern, you can ask your installer to use a seam sealer with the same CRI green label.

Latex

A water emulsion of synthetic rubber, natural rubber, or other polymer. In carpet, latex is used for laminating secondary backings to tufted carpet, back coating carpet and rugs, and for manufacturing formed ( waffle style) underlays. Almost all carpet latex consists of styrenebutadine synthetic rubber (SBR) compounded with large quantities of powder fillers. The latter are most often whiting, which is calcium carbonate. Latex is the raw material from which rubber is made.

Latex Penetration

Yarn is removed from the primary and secondary backings and inspected under a microscope to determine how much latex penetrated the yarn bundle that exists beneath the primary backing. The results are stated as a percentage of latex penetration. A generally accepted level is about 85% latex penetration determines the tuft bind of the carpet.

If the latex penetration is too low, then what you might get the appearance similar to what you can view on the left hand side of the picture below. The style of carpet is loop pile sisal and the fibre is wool.

Fuzz 

If the carpet is of a 'cut pile' construction such as the Frieze or Saxony Style, then the yarn could be loosing twist. Warranties for twist loss exist for some sixth generation yarns. See Antron

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