What is Rayon?
When talking about fabrics, ‘rayon’ is not an unheard name. I am sure some of you have clothes, accessories or home-ware items made of this material. But do you know what is rayon? In a nutshell, it’s a man-made fibre and yet, it’s not hundred percent synthetic. Intrigued? Read on to find out what is rayon.
What is rayon made of?
Rayon is a natural-based material that is made from the cellulose obtained from wood pulp or cotton. It’s a low-cost and convenient fibre to work with and lends itself to diverse uses. There are several grades of rayon that can imitate the look and texture of other natural fibres such as cotton, linen and silk. The different types of rayon include viscose, modal and lyocell.
What is rayon’s origin and history?
In the 1860s, the French silk industry was in crisis because of a disease affecting the silkworm. Louis Pasteur and Count Hilaire de Chardonnet were studying this problem with a view to saving the industry. It was during this time that Chardonnet became interested in finding a way to produce artificial silk and in 1885, he patented the first successful method to make fibre from cellulose.
For the next forty years this material was called artificial or imitation silk. By 1925 it had developed into an industry unto itself and was named rayon by the Federal Trade Commission (FTC). The term rayon comprised any man-made fibre made from cellulose.
In 1952, the FTC divided rayon into two categories: fibres consisting of pure cellulose (rayon) and those consisting of a cellulose compound (acetate). By the 1950s, most of the rayon produced was being used in industrial and home furnishing products rather than in apparel. This was because regular rayon (also called viscose rayon) fibres were weak compared to other fibres used for clothing.
In 1955, manufacturers began to produce a new type of rayon—high-wet-modulus (HWM) rayon—which was stronger and could be used to make sheets, towels, and apparel. The creation of HWM rayon is considered the most important development in rayon production since its invention in the 1880s. Today rayon is one of the most widely used fabrics and is produced globally.
How is rayon made?
Rayon is made from cellulose obtained from wood pulp–usually from pine, spruce, or hemlock trees—and cotton linters, which are residue fibres clinging to cotton seed after the ginning process.
Viscose rayon is the most common and versatile. It can be blended with man-made or natural fibres and made into fabrics of varying weight and texture. It is also an absorbent, cost-effective and comfortable fabric to wear.
High-wet-modulus rayon is a stronger fibre than regular rayon. It is similar to cotton and easy to care for. Fabrics containing modulus rayon can be machine-washed whereas those made of regular rayon need to be dry-cleaned. Whether it is wood pulp or cotton linters, the basic raw material for making rayon must be processed in order to extract and purify the cellulose. The resulting sheets of white, purified cellulose are then treated to form regenerated cellulose filaments. These filaments are then spun into yarns and eventually made into the desired fabric.
• Sheets of purified cellulose are steeped in sodium hydroxide (caustic soda), which produces sheets of alkali cellulose. These sheets are dried, shredded into crumbs, and then aged in metal containers for 2 to 3 days. The temperature and humidity in the metal containers are carefully controlled.
• After ageing, the crumbs are combined and churned with liquid carbon disulfide, which turns the mix into orange-coloured crumbs which is bathed in caustic soda. This results in a viscose solution that looks and feels like honey. The solution is filtered for impurities and stored in vats to age, this time between 4 and 5 days.
• The viscose solution is next turned into strings of fibres by forcing the liquid through a spinneret into an acid bath. The acid coagulates and solidifies the filaments resulting in regenerated cellulose filaments. Next, the filaments are ready to be spun into yarn.
• Once the fibres are sufficiently cured, they are ready for post-treatment chemicals and the various weaving processes needed to produce the fabric. The resulting fabric can then be given any of a number of finishing treatments. These include calendaring, to control smoothness; fire resistance; pre-shrinking; water resistance; and wrinkle resistance.
What is rayon used for?
The most common use for rayon is to make various articles of clothing and home-ware, such as blankets, sheets and curtains. Rayon can also be used for making tire cords and surgical products.
What are the advantages of rayon?
• Inexpensive but looks and feels luxurious
• Some variants of rayon are known for their silk-like feel
• Drapes well
• Blends well with other fibres
• Dyes easily resulting in beautiful colours
What are the disadvantages or rayon?
• Not a very strong fabric and more so, when exposed to light or moisture
• Can shrink when washed thus has to be dry-cleaned
• Can get damaged while ironing
• Manufacturing method is harmful to the environment and to the safety of the workers if the chemicals used are not handled carefully.
Now that you know all about rayon, get your hands on our fabric swatch pack to go through our range and pick the fabric for your next project .