Cotton: is a soft, fluffy staple fiber (fibers of different, varying lengths) that grows in a boll, or protective case, around the seeds of the cotton plants of the genus Gossypium and spun into a yarn then woven to create a soft, durable fabric.
Cotton is comfortable and breathable. It is hypoallergenic. All of these properties make cotton the natural fiber of choice for nonwoven hygiene products, from feminine pads to baby care and adult incontinence.
But cotton has an even greater array of attributes suitable for a variety of nonwoven applications. In the fiber world, the strength of cotton is considered moderate to above average. The strength (tenacity) of cotton is 3.0-5.0 grams/denier when dry. This fiber is unique in that its strength increases when wet to 3.3–6.0 grams/denier. Cotton has a natural moisture recovery rate of 8.5% under normal temperature and humidity conditions. It also features a heterogeneous length distribution.
Polyester: is a synthetic fiber derived from coal, air, water, and petroleum. “Long-chain polymers chemically consisting of at least 85% by weight of an ester, a dihydric alcohol, and a terephthalic acid” is how polyester is frequently defined. Polyesters are easily flammable at high temperatures. Due to its wrinkle-resistance capacity, it is widely spun with other natural fibers.
Polyester is hydrophobic. For this reason, polyester fabrics don’t absorb perspiration or other fluids, leaving the wearer with a moist, clammy feel. Polyester fibers typically have a low level of wicking. Relative to cotton, polyester is stronger, with a greater ability to stretch. Fiber strength can range from 2.5 grams/denier to 9.5 grams/denier.
Environmentally concerned purchasers frown on polyester use. Since it’s a man-made fiber derived from petroleum-based products, polyester is not considered sustainable, nor is it biodegradable.
Cotton and polyester are often mixed to create garments with qualities that neither material can accomplish on its own. A fabric made from a poly cotton blend combines the strengths of the two fibers.
Polycotton fabric is manufactured by combining the natural fiber cotton with the synthetic or manmade fiber, polyester.