Twine
Used to bind anything from postal packages to bales of straw, twine is used for agriculture, shipping, masonry, fishing, and even sporting goods. Seines, clothing lines, netting for basketball and hockey, tethers and binding products are commonly made of twine. The popularity of twine can be attributed to the many materials used in its construction. Sisal, manila, jute, flax, cotton, hemp and other natural fibers were once the predominant twine materials. Today, however, synthetic fibers make up nearly 95% of the twine industry. Technological advances in synthetic materials such as acrylics, nylon and polypropylene make their use economical and practical as they offer added strength. Natural fibers are still favored in some environments such as agriculture, which value their biodegradability and other favorable qualities.
Twine begins with either the harvesting of natural fibers or the production of synthetic fibers. No matter the source, these materials are spun into yarn or thread. Varying quantities of these threads are then twisted or braided together to produce twine. The number of threads is often directly related to the firmness and tensile strength of a specific twine. The number of strands, commonly referred to as the ply, is also one manner of determining the grade of a given product. Standard plies range from one to eight. Unlike other ropes, twine is not highly regulated, so many consumers choose to select twine based on the diameter of the cord rather than the ply. Treatments such as copper napthenate, tar or tallow may be added to minimize loss of strength due to fungi, mildew and rot in addition to adding protection against chaffing in high stress situations and chemical corrosion. While natural fiber twines are inherently resistant to water and sunlight, synthetic fibers may require additional waterproofing and UV protection. The available treatments can provide these features and prolong the working life of twine. While treatment is important, further considerations include strength lifts, abrasion resistance, flexibility, lay and cord size. Rope suppliers may provide insight into the rope requirements for a specific task.
