Torsion allows a multifilament (consisting of many fibers) thread to keep the structure of the common thread and, in the process of its use, does not lose its properties for a long time due to fixing them together.
It has high breaking load and elongation, good abrasion resistance, resistance to repeated bending. Basically, a white thread is produced (a harsh thread) and, to a lesser extent, a thread is made from non-ferrous raw materials.
From fibrous materials, thin threads are obtained, called yarn or primary threads. The yarn got its name from the process of spinning natural fibers, when individual fibers, twisting and rallying with each other, are drawn into a thin long thread. However, the bulk of solid synthetic fibers are not subjected to such spinning, but are twisted into a primary thin, so-called multifilament thread. However, by analogy with natural, it is often called yarn.
Depending on the purpose, yarn is divided into weaving, knitting, thread, rope, net knitting, etc. In all cases, it is only a semi-finished product from which certain industrial products are made. In industrial fishing, yarn, or primary thread, is used to produce fishing thread and netting.
The technical properties of the primary thread affect the quality of fishing products and, in turn, depend on the type of fibrous material.
A smooth multifilament, synthetic thread, unlike monofilament, is often difficult to determine with conventional measuring instruments (micrometer, caliper) because of the relatively soft structure of the thread, therefore, instead of directly measuring its thickness, it is expressed indirectly as a ratio between length and mass. For this purpose, the system of specific gravity measurement in tex is used.
