Introduction of Fiber Length and Measurement

 

Fiber length directly affects the processing performance and practical value of the fiber and reflects the quality and performance of the fiber itself, so it is one of the most important indicators of the fiber.

​Fiber length definition

Natural length: All kinds of fibers have different degrees of bending or crimping in the natural stretch state, and its projected length is called the natural length.
The length of a fiber in a fully stretched state is called the stretched length.

Common fiber length ranges

The length of natural fibers is affected by the variety and growth conditions: the length of cotton fibers is short, fine-staple cotton is generally less than 33mm, long-staple cotton is generally less than 50mm, and the length of longer than 50mm is ultra-long-staple cotton; the length of wool is longer, generally more than 50mm, the longest Up to 300mm.
The cutting length of chemical fiber shall be determined according to the type of processing machine and the length of the fiber blended with it: cotton-type chemical fiber, wool-type chemical fiber, medium-length chemical fiber (for processing wool-like products).

Fiber length measurement

The fibers are sorted into straight and parallel fiber bundles with one end flat, and then grouped and weighed according to a certain length group interval to obtain various length indexes of the fibers.
Comb Fiber Length Measuring Instrument
Put the straight fiber bundles on the comb, press the fork to press the fiber bundles into the comb needles, pull out part of the fibers from the exposed end one by one, stack them on the other end of the comb, and make a fiber bundle with one end even.
Roller Length Measuring Instrument
The roller-type fiber length tester measures the length of cotton fibers in groups according to the distribution characteristics of fiber length. Long and short fibers are controlled with the help of roller nippers and grouped and isometric gravimetric tests are performed. During the test, the fiber bundle of the sample should be pretreated so that one end is trimmed, and then clamped with rolling clamps. As the drum rotates, short fibers come out first, followed by long fibers. Weight measurements will be made against these individual fiber groups. Through data calculation, data such as fiber length distribution, main part length, qualified length, average length, base number, and short fiber uniformity can be obtained.
Photoelectric fiber length camera
KX730 fibrograph adopts photoelectric method to accurately and quickly measure the average length, upper half average length and evenness index of cotton fiber samples. The instrument is designed according to the theory of random distribution of cotton fiber length and the theory that the light intensity passing through the fiber bundle is negatively correlated with the number of fibers in the cross section of the fiber bundle.

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