Definition and Test Procedure of Fiber Strength


Cotton fiber is a textile raw material, and fiber strength is an important indicator. Since fiber materials are often processed into high-strength threads and ropes, the strength of fiber materials is an important determinant of their performance. The strength of fiber can directly affect the quality and performance of products such as fabrics and composite materials. Therefore, in the production of fiber products, it is very important to measure the fiber strength to ensure the quality and reliability of the product.

Definition

The force of a fiber is also called absolute force or breaking force. Breaking force is the force required when the fiber material is stretched to break by the outside world (the maximum external force that the fiber can withstand). The basic unit is Newton (N), and the derived units are centinewton (cN), millinewton (mN), kilonewton (kN), etc. The readings measured on various strength testers are all forces. For example, the breaking force of a single fiber and a bundle of fibers are the forces required to stretch a fiber and a bundle of fibers to break, respectively. Breaking force is related to the thickness of the fiber, so the breaking force of fibers of different thicknesses lacks comparability.
The force required to break a fiber of unit fineness is called strength. This index is used to compare the tensile breaking properties of fibers of different thicknesses. When the fiber or yarn thickness is different, its breaking force is also different, so the breaking force of fibers or yarns of different thicknesses is not comparable. For the convenience of comparison, the breaking force can be converted into the force at the specified thickness, that is, the breaking strength. Due to the different standard thicknesses, there are many kinds of strength of fiber materials, and the most commonly used are the following three.

Fiber strength test procedure

1. Prepare the sample: cut the cotton fiber into a certain length sample according to the standard requirements, and record the quality of the sample.
2. Installation equipment: Fix the sample holding device on the tester, adjust the instrument parameters and calibrate.
3. Test: Clamp the fiber sample on the test fixture to ensure that the sample is evenly stressed, and then start to apply tension.
4. Record data: At the moment of fiber fracture, record the maximum tension value at this time, and stop loading.
5. Calculation result: The fiber strength is calculated according to the formula, and the final result is obtained by unit conversion.

Maintenance of KX101 fiber strength tester

Pressley Fibre Strength Tester is used to determine the breaking strength of cotton fibers in a flat bundle , Associated with JN-B torsion Balance ,It is also be used to determine the breaking tenacity of cotton fibers in the flat Bundle .
Click to get more details
  • Pressley clamp production process:
    1. The Pressley clamps adopt blackening surfaces process during the production, so it has only a certain anti-rust ability. It will rust if stored for a long time in a high humidity environment.
    2. In addition, due to the hardness requirements of the design and production process of Pressley clamp (jaw

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