What is rayon? Advantages and disadvantages of rayon.

Introduction

Rayon is a regenerated natural fiber made from cellulose fiber. In other words, rayon is 100% cellulose and has the same chemical composition as natural cellulose. Rayon has the same molecular structure as cotton and linen, except its molecular chains are shorter and form fewer tiny crystals. The many types and grades of rayon fibers can imitate the feel and texture of natural fibers such as silk, wool, cotton, and linen. Rayon fiber is used to make textiles for clothing and other needs.

What is Rayon fabric?

Rayon is a semi-synthetic fiber made from natural cellulose. The main raw material is wood pulp or cotton linters. Because it looks and feels like silk, it is also called Artificial Silk. It was first invented in 1883 as the first man-made fiber.

As a Textile Engineer working in Denim Washing for the last 11 years, I have seen that rayon is widely used for summer clothing, hijabs, and saree lining because of its softness and breathability.

Characteristics of Rayon

i. One of rayon's notable characteristics is its similarity to natural fibers like silk or cotton. Depending on how it's manufactured, rayon can possess qualities ranging from softness and drape similar to silk (known as viscose) to durability akin to cotton (termed high-wet-modulus). This versatility allows for various applications depending on the desired end-use.

ii. The absorbent nature of rayon makes it suitable for warm-weather garments since it can effectively wick away moisture from the body. It also has excellent dye retention properties, enabling vibrant colors without quickly fading. Rayon also tends to have good breathability compared to synthetic materials like polyester or nylon. 

iii. Due to its versatility as a fabric and filament-forming material, rayon finds application beyond apparel manufacturing. Its strength when wet makes it ideal for industrial use, such as tire cords or conveyor belts, where durability is crucial even under moist conditions.

Properties of Rayon

i. Rayon fiber is a regenerated cellulose fiber made from a natural cellulosic source.

ii. The extensibility of lyocell rayon fiber fabric is an effective parameter for the development of excessive wet shrinkage or the presence of slack in the case of clothing products.

iii. Its fibers range from 1.5 to 15 deniers.

iv. It is soft, comfortable, and versatile.

v. It loses strength temporarily when wet.

vi. It is a naturally very bright fiber

vii. It can emulate the feel and texture of silk, wool, cotton, and linen.

viii. These fibers are easily dyed in a wide range of colors.

ix. Its fabrics are very soft, smooth, cool, comfortable, and highly absorbent, but they do not always insulate body heat.

x. The durability and appearance retention of regular viscose rayons are low, especially when wet.

xi. It has the lowest elastic recovery of any fiber.

xii. High-wet-modulus rayon is much stronger and exhibits higher durability and appearance retention.

xiii. Regular viscose-rayon recommended care is dry-cleaning only.

xiv. It is more moisture-absorbent than cotton, and it does not build up static electricity.

xv. It is not resilient like other cellulosic fibers,

xvi. It withstands ironing temperatures slightly less than those of cotton.

Manufacturing process of Rayon (4 steps)

Rayon is made by a wet-spinning process. The basic process is:

1. Steeping: Wood pulp is treated with caustic soda to make alkali cellulose.

2. Xanthation: Carbon disulfide (CS2) is added to make cellulose xanthate.

3. Dissolving: It is dissolved in caustic soda to make a thick viscose solution.

4. Spinning: The viscose is passed through spinneret holes into a sulfuric acid bath. The acid converts it into solid rayon filaments.

After spinning, the fibers are washed, stretched (drawing), and cut into staple fiber if needed.

Types of Rayon

Type	Made From	Best For
Viscose Rayon	Wood pulp	Daily wear, Saree, Dress
Lyocell/ Tencel	Sustainable wood pulp, closed-loop	Eco-friendly fashion, Premium wear
Modal Rayon	Beech tree	Underwear, Soft T-shirts
Cupro Rayon	Cotton linter	Luxury jacket lining

Advantages of Rayon

1. Soft and comfortable: Feels like natural silk, very soft on skin.

2. Highly absorbent: Absorbs 13% more moisture than cotton. Perfect for summer and humid weather, like in Bangladesh.

3. Excellent drape: Falls beautifully; that's why it's best for dresses, skirts, and hijabs.

4. Breathable: Allows air circulation and keeps the body cool.

5. Affordable: Looks like silk, but the price is almost 50% less than real silk.

6. Versatile: Can be blended easily with cotton, polyester, and wool.

7. Bright colors: Dye absorption is very good; the color becomes bright and long-lasting.

8. Biodegradable: Made from natural cellulose, so it decomposes faster than polyester.

Disadvantages of Rayon

1. Weak when wet: This is the biggest problem. When wet, rayon loses almost 40-50% of its strength. In my factory experience, we have to handle rayon garments very carefully during wet washing.

2. Shrinks and wrinkles easily: If you wash in hot water, it will shrink. Wrinkles very fast.

3. Needs special care: Most regular viscose rayon needs dry cleaning or a cold, gentle wash. Cannot use a dryer.

4. Environmental issue: The production uses highly toxic Carbon Disulfide (CS2), which is harmful for workers if not managed properly.

5. Pilling problem: After 4-5 washes, pilling can happen in friction areas.

Rayon fabric environmental impact

Rayon's production process is very toxic. The production process emits toxic gases. The chemicals used during rayon production contaminate drinking water, air, and soil, harming the ecology, plants, and animal health. Large amounts of water are contaminated during the production of viscose and rayon fiber. Textile manufacturers use dangerously toxic chemicals and methods to make rayon materials.

Unfortunately, there are plenty of garments available in the market that are made using Rayon. Cheaply produced garments are often made with rayon as a very large part of the primary fiber material or in fiber blends. Synthetic and man-made fibers are available at a relatively low cost compared to natural fibers. Rayon is one of the cheapest fibers among all man-made fibers.

Clothing made with rayon is usually substandard and harmful. These are not very durable and change their shape and color over time. The fibers break easily when washed. Don’t fall into the trap of thinking rayon is a natural organic fiber. The main material used for its production is wood pulp cellulose. Yet Rayon has some aspects that are sustainable and environmentally friendly.

Most rayon production processes are bad for the environment. It also takes time to decompose, especially as it increases the number of microfibers in our oceans every day. Its production process involves many hazardous chemicals. Wearing rayon too often is extremely toxic and harmful to our skin, body, and health. It is not the most durable fabric. This is not the best choice of clothing material for you.

Rayon vs Cotton vs Polyester: Which is better?

Feature	Rayon	Cotton	Polyester
Softness	Very Soft	Soft	Less Soft
Breathability	High	High	Low
Durability	Low when wet	High	Very high
Price	Medium	Medium	Low
Best For	Summer Dress	Daily Wear	Sportswear

Conclusion

If you want softness and drape for summer, choose Rayon. If you want durability, choose Cotton. If you want cheap and strong, choose Polyester. Whether used in fashion garments, home textiles, or industrial materials, rayon contributes significantly to the textile industry's diverse range of options available today. The future of rayon fabric is bright. There is a growing demand for rayon worldwide, and many new technologies promise to make rayon even better and cheaper.

 

Frequently Asked Questions (FAQ)

Q1. Is rayon a natural or synthetic fiber?

Ans: Rayon is semi-synthetic. The raw material is natural (wood pulp), but the manufacturing process is chemical.

Q2. Is rayon good for summer?

Ans: Yes, it is one of the best fabrics for summer in Bangladesh because it is highly absorbent and breathable.

Q3. Does rayon shrink after washing?

Ans: Yes, if you wash it in hot water. Always wash in cold water and hang dry to avoid shrinkage.