Monthly Archives: July 2012

Hemp Fiber | Physical And Chemical Properties Of Hemp Fiber

Hemp is a bast fiber plant like jute, kenaf, flax and ramie. Hemp fibers are cellulosic fibers. Hemp fibers are one of the strongest and most durable among all of the natural textile fibers. Hemp fiber shows similar properties like all of the natural bast fiber and excels in fiber length, durability, strength, absorbency, ant mildew and anti-microbial properties. Various types of decorative textile products are produced by processing this fiber. It also use for blend with other fibers and gives extra strength to the fiber.

Like all of the natural bast fiber, hemp fiber has some characteristics. Followings are the main physical and chemical properties of hemp fiber.

Physical Properties of Hemp: Physical properties of hemp fibers are given below:

  1. Color: The color of hemp fiber is yellowish grey to deep brown.
  2. Length: 4 to 6.5% feet.
  3. Tensile Strength: Hemp is a very strong fiber.
  4. Elongation at break: Hemp fibers stress easily.
  5. Elastic Recovery: Elastic recovery is very poor. It is less than linen fiber.
  6. Moisture Regain (MR %): Standard moisture regain is 12%. It is more than cotton and linen.
  7. Effect of Heat: Hemp fiber has an excellent resistance to degradation by heat.
  8. Effect of Sun Light: It has enough ability to prevent the bad affect of sun light.
  9. Luster: Highly bright like linen fiber.

Chemical Properties of Hemp fiber: Hemp is a natural bast fiber and it has some chemical properties. Chemical properties of the hemp fiber are given below:

  1. Effect of Acids: Hemp is attacked by hot dilute acids or cold concentrated acids which it disintegrates. Hemp fiber is destructed like cotton fiber in the action of acid.
  2. Effects of Alkalis: Hemp fiber has an excellent resistance to alkalis.
  3. Effect of Organic Solvent: It does not affected by the organic solvents.
  4. Effects of Insects: Hemp fiber is not attacked by moth-grubs or beetles.
  5. Effect of Micro Organism: Hemp fiber is attacked by fungi and bacteria. Mildews will feed on hemp fabric, rotting and weakling the materials. Mildews and bacteria will flourish on hemp under hot and humid condition. They can be protected by impregnation with certain types of chemicals. Copper Nepthenate is one of the chemical.
  6. Ability to Dye: It is not suitable to dye the hemp fiber.

Hemp is a strong fiber for this reason the product which is produced from the hemp that is also strong.

Chemical Composition Of Sisal Fiber | Cellulosic Fiber

Sisal fiber is a cellulosic natural fiber. Like all of the natural fiber it is a natural fiber. It is collected from the leaf of a plant like cactus. This leaf is very straight and sharp. By processing this leaf sisal fiber is collected.

Sisal fiber cultivating countries: Sisal fiber is cultivated in many countries of the world. Among all of the country Africa, Middle America, West Indies, Florida and some parts of west Indian island where this plant is cultivated.

Chemical Composition of Sisal Fiber: Sisal is composed of many chemical components. Cellulose is the main component of sisal fiber. Here, I have presented the chemical composition of sisal fiber.

Cellulose                 : 71.5%

Hemi-cellulose          : 18.1%

Lignin                     : 5.9%

Pectin                    : 2.3%

Fat and wax            : 0.5%

Water soluble matter: 1.7%

Properties of Sisal Fiber: Sisal fiber is a straight fiber. The color of the fiber is yellowish. It is decomposes in the salt water.

Uses of Sisal Fiber: Sisal fiber is used for making rope, twine and high qualified brash. It is uses as the alternatives of the tail of horse. It is used by mixing with hemp fiber.

So, sisal fiber has an importance in some cases.

Chemical Composition Of Hemp Fiber | Natural Fiber

Hemp is a natural, cellulosic and bast fiber. Hemp fiber is collected from the hemp plant. The plant from which hemp fiber is collected that is called Cannabis sativa. This plant is generally grows in the bank of Capsicum sea. It is interesting that this type of plant is grows naturally or in some reason it is cultivated manually. The cultivation process is near flax cultivation. It is a natural fiber and it has a chemical composition which helps us to identify this fiber from the others.

Chemical Composition of Hemp Fiber: Hemp is a cellulosic natural fiber and cellulose is the main component of hemp fiber. I have presented a chemical composition of hemp fiber as below.

Cellulose                     : 77.5%

Hemi-cellulose              : 10.0%

Lignin                         : 6.8%

Pectin                         : 2.9%

Fat and Wax                : 0.9%

Water soluble materials  : 1.8%

This composition is calculated base on 100%.

This composition will help us for the next processing. If we want to get good results, then we have to know the chemical composition of hemp fiber.