# Relation between Two Fineness Measuring Systems

Fiber Fineness used to determine the fineness of fiber and analyze the composition and content of animal fiber, vegetable fiber, and mineral fiber. such as cotton, wool, man-made fiber, etc. It is based on digital image technology and interactive operation. The operator selects the objects, and then the system measures fiber and gets the statistic result automatically. In this article, the relation between two fineness measuring systems are as follows:

Fiber Fineness Test: By using the microscope to magnify the fiber and project to screen, then select fiber and the diameter will be calculated automatically.

Fiber Composition Test: Different fiber with different morphological features, by using the microscope to magnify the fiber and project to screen, then observe the morphological feature of fibers, and compare with standard photos to ensure the composition of the fiber.

Relation between Two Fineness Measuring Systems

System of measuring fineness:

The fineness of cotton fiber is measured by the following two systems:

1. American system :

In this system, the linear density is expressed in a microgram per inch.

Here, the unit of weight = microgram (gm X 10-6)

The unit of length = inch

2. British system:

In this system, the linear density is either the fiber wt, per cm or the hair wt per cm, H

Here, the unit of weight = milligram X 10-5

The unit of length = cm

The unit of fineness = H X 10-5 mg/cm

### Relation between Two Fineness Measuring Systems

American linear density = Fiber wt in gm X 10-6/inch
= A X 10-6 gm/inch

British linear density = Fiber wt in mg X 10-5/cm

= Fiber wt in gm X 10-3 X 10-5/cm
=H X 10-8 gm/cm
= H X 10-8 X 2.54 gm/inch

We have, A X 10-6 = H X 10-8 X 2.54

=> A = H X 10-2 X 2.54

This is the derived relationship between them.

```Author of this Article:
Rana Sohel
Executive Engineer
Sunman Textile Mills Ltd. Chittagong
Cell: +8801912-420118
Email: [email protected]```

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