BS 4044:1989

Foreword
Committees responsible
Methods
Section one. General
1 Scope
2 Definitions
3 Atmosphere for conditioning and testing
Section two. Method A. Determination of fibre length
                of cotton, waste silk and uncrimped
                staple fibres
4 General
5 Principle
6 Apparatus
7 Test specimens
8 Procedure
9 Calculation and expression of results
10 Test report
Section three. Method B. Determination of fibre length
                (barbe and hauteur) of twistless combed
                slivers and prepared rovings of a type
                used in the woollen and worsted systems
11 Principle
12 Apparatus
13 Test specimens
14 Procedure
15 Calculation and expression of results
16 Test report
Tables
1 Example of fibre length distribution
2 Example of presentation of results for fibre length
    distribution test
Figure
1 Example of comb sorter diagram

Two procedures. Method A is applicable to cotton and other uncrimped staple fibres. Method B is applicable to twistless combed slivers and prepared rovings in the wollen and worsted systems.

This British Standard describes methods for determination of fibre length by the use of a comb sorter diagram. The following two procedures are described.

1. Method A is applicable to samples composed of individual fibres, particularly to samples of cotton fibres, and to samples of waste silk and uncrimped staple fibres having a fibre length of approximately 50 mm.

   NOTE 1 For longer types of waste silk and staple fibre, the technique for arranging the test specimen in the form of a continuous sorter diagram becomes progressively more difficult. Only specially skilled operators can make satisfactory sorter diagrams on samples containing many fibres of 100 mm or more in length. Moreover, the time required to make a test increases steadily with increasing fibre length of sample.

2. Method B is applicable to twistless combed slivers and prepared rovings of a type used in the woollen and worsted systems.