Synthetic Fibers

The most commonly used synthetic round slings are made of nylon- or polyester-type yarns. It has a tensile strength nearly three times that of Manila.

The advantage of using nylon rope is that it is waterproof and has the ability to stretch, absorb shocks, and resume normal length. It also resists abrasion, rot, decay, and fungus growth.

Nylon was first made in 1935. It was intended to be a substitute for silk and was used in place of silk in parachutes in 1941, when the USA entered World War II. Synthetic round slings offer a number of advantages for rigging purposes. Synthetic fibres are much stronger, and hence more durable than natural fibres.

Time- Lightweight fiber slings offer significant reductions in rigging time and manpower. They are 1/7th the weight of steel wire rope or more. In heavy lift projects, installation crews also receive savings in transportation and storage costs.

HSE benefits - Lightweight rope and round slings offer superior flexibility which translates into fewer rigging injuries. They are also soft of hand causing little damage to rigger or expensive payloads.

Longer service life - Modern high strength synthetic fibers are remarkably durable and will not rust, corrode or fish-hook. They are not affected by fresh or salt water. Wear points can be protected from abrasion, cutting and heat damage. They are designed for multiple lift use and are easy to inspect.

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Natural Fibre Rope

Hemp.

This tall plant is cultivated in many parts of the world and provides useful fibers for making rope and cloth.

Hemp was used extensively before the introduction of Manila, but its principal use today is in fittings, such as ratline, marline, and spun yarn. Since hemp absorbs much better than the hard fibers, these fittings are invariably tarred to make them more water resistant. Tarred hemp has about 80 percentage of the strength of un-tarred hemp. Of these tarred fittings, marline is the standard item of issue.

Coir and Cotton.

Coir rope is made from the fiber of coconut husks. It is a very elastic, rough rope about one-fourth the strength of hemp but light enough to float on water. Cotton makes a very smooth, white rope that withstands much bending and running. These two types of rope are not widely used in the military; however, cotton is used in some cases for very small lines.

Jute.

The glossy fiber of either of two East Indian plants of the linden family used chiefly for sacking, burlap, and cheaper varieties of twine and rope.

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Manila Fibre Rope

Manila.

This is a strong fiber that comes from the leaf stems of the stalk of the abaca plant, which belongs to the banana family. The fibers vary in length from 1.2 to 4.5 meters (4 to 15 feet) in the natural states. The quality of the fiber and its length give Manila rope relatively high elasticity, strength, and resistance to wear and deterioration. In many instances, the manufacturer treats the rope with chemicals to make it more mildew resistant, which increases the quality of the rope. Manila rope is generally the standard item of issue because of its quality and relative strength.

Sisal.

Sisal rope is made from two tropical plants, sisalana and henequen, that produce fibers 0.6 to 1.2 meters (2 to 4 feet) long. Sisalana produces the stronger fibers of the two plants, so the rope is known as sisal. Sisal rope is about 80 percent as strong as high quality Manila rope and can be easily obtained. It withstands exposure to sea water very well and is often used for this reason.

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Fibre Rope

Dear Readers,

 

Fibre rope is made from either natural or synthetic fibres. The natural fibres come from plants and include manila, sisal and hemp. Synthetic fibres include nylon, polypropylene, polyethylene and polyester.

In the fabrication of fibre rope, a number of fibres of various plants are twisted together to form yarns, which are then twisted together in the opposite direction to the fibres to form strands. The strands are twisted in the opposite direction to the yarns to form the completed rope. The direction of twist of each element of the rope is known as the "lay" of that element. Twisting each element in the opposite direction puts the rope in balance and prevents its elements from unlaying when a load is suspended on it. The principal type of rope is the three-strand, right lay, in which three strands are twisted in a right-hand direction. Four-strand ropes, which are also available, are slightly heavier but are weaker than three-strand ropes of the same diameter.

Fibre ropes are made from following materials

1. Manila

2. Sisal

3. Hemp

4. Coir and Cotton

5. Jute

 

Details of above rope material will be discussed my next post

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