fiber

What is Aramid Fiber, Yarn and Fabric

Complete description of Aramid Fiber

Aramid fiber is a synthetic polymer material developed and produced by DuPont. It has gained popularity in this area due to its properties and versatility – it can be used for everything from body armor to technical products that need high levels of strength, flexibility, or performance, such as sports gear and accessories

Aramid fiber is a lightweight fiber, that is almost completely made of carbon and has the specific ability to absorb very high levels of heat. It works by absorbing high levels of the sun’s heat, which can cause it to become up to 8 times thicker than steel! Aramid is strong; it can support a payload equivalent to up to 10 concrete slabs, withstanding very heavy loads from earthquakes and hurricanes.

Aramid fibers are the strongest biological fibers on the planet. They are strong and light, with high modulus, resulting in a high strength to weight ratio for the most demanding applications. They can be used as reinforcement in composite laminates, as ballistic materials in bulletproof vests, are used to make parachutes and other fabrics such as thermal protective clothing.

Aramid is a combination of carbon, hydrogen and oxygen gases used in the manufacture of high-performance membranes. The fibers are made from a variety of ingredients such as starch or cellulose, cellulose ester or phosphor, it is melt spun with an inner core of heat resistive material into a special high-temperature resistant fiber rope. The fibers have excellent abrasion resistance, thermal insulation properties, moisture resistance and chemical resistance.

End use of Aramid Fabrics

This material is used as end user in a huge array of applications; it is used as a filling material, insulation, reinforcement and separator.

Aramid fabric, used in the making of bulletproof vests and other defense-related items. Aramid is a lightweight and strong synthetic fiber that can be spun into paper-thin, almost transparent fabrics.

Aramid fabrics are used in areas where high performance, low weight and abrasion resistance are required. They can be used as a part of landing gear or rotor blades, or they can be used as part of protective clothing. Because of their excellent mechanical properties and light weight, they are best suited for use during space travel where circumstances demand they not only be lightweight but also require strength.

Aramid (Kevlar) is used to make aircraft, armoured vehicles and boats and marine applications. Other uses include clothing, housing, tents, flooring and large appliances. Aramid fabric may also be used in fire resistance system between buildings or concrete structures.

Author: Afzaal Khadim Khan
Owner: Textiles Bar
Lahore Pakistan

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What is staple length in cotton? Complete definition.

Staple length is the major characteristic of cotton fiber on which cotton is traded and its price is determined. Staple length is the length of fiber. This parameter of cotton is so important that every consumer has to first decide what yarn he wants to produce and what staple length of cotton will be required to produce this yarn. In different origins staple length of fiber is spoken with different length scales like inches, MM milli meters and in USA mostly 32nds.

Here are a few staple lengths and their importance and definition also described for better understanding.

Staple length below 27 mm is considered short staple cotton and mostly used for yarn counts below 20/1 ring yarns or low quality or cheaper yarns like open end depending on the requirements of demands.

Major portion of global cotton consists of the staple length between the range of 27 to 30 mm fiber length. This sort of cotton is used to produce medium to good quality yarns. Count range mostly from 20/1 to 40/1 carded or combed for weaving or knitting.

Above this is long staple cotton with staple length 30mm to 33 mm. This cotton is used for producing fine quality yarns from 40/1 to 80/1 combed and compact yarns which are used for light weight fine quality fabrics.

Cotton with 33mm above is called ELS or Extra-long staple cotton used for very fine yarns, high strength or tenacity yarns.

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Author: Afzaal Khadim Khan
Owner: Textiles Bar
Lahore Pakistan

What is Rd and +b in cotton and its definition?

Both Rd and +b are the color grade parameters for cotton. Rd describes the reflectance in cotton. Higher rd indicates the brightness in cotton while lower rd reflects the dullness or grey look in cotton. Cotton having higher rd is considered the better cotton and it also adds to its value and price.
While +b in cotton indicates the yellowness in cotton. Both these units are tested or measured on fiber testing machine HVI (High Volume Instrument) Earlier Fibro graph machine was used to test the cotton results but now a days majority of labs and mills use HVI machine with latest features.

What is GRS certificate? Global Recycled standards

GRS stands for Global Recycled Standards. GRS is a tracking system to track the transactions of said material from its raw shape to final or consumer form. It covers the complete chain of GRS certified goods. GRS intends to verify the recycled contents of a good or product. GRS certification is very common in textile sector where fiber is made out of the used plastic bottles and other items. First of all GRS fiber is made and then it is sold to spinning mills with GRS certificate and its transaction. After that this GRS certified yarn is used to make fabric and garments. At every stage the seller and buyer ensure the GRS transaction.