To prepare comb sorter diagram

By using comb diagram determine the following:-
1. Mean length
2. Effective length
3. Short fiber percentage
4. Dispersion percentage 

Fiber diagram

Operating Device :- Comb sorter

Material Used :- Cotton

Introduction  :- Comb sorter is the device in which we can place the fiber tuft which is selected from different or same type of fiber and also these fiber are oriented thorough comber and after this we can obtained the actual length and graph between different fiber length.

1. Mean length :- It is estimated quantity which signifies the arithmetic mean of length of all fibrees present in sample of cotton.

2. Effective length :- It is defined as length of main bulk of longer fibres. 

American staple = 0.91 X effective length.

3.Short fiber length :- A quantity which, the raw material is characterised. It is the average length of spinnable fibers.

4. Dipersion percentage  :- It represent the variation in the length of fibers. It is the inter quartile range expressed as a percentage of effective length.

Comb sorter

Procedure :-

1.Fiber sample is condition by 65% R.H (20 + 2 C) for 24 hours.

2.Tuft of fiber are straighten by hand, until fibres get aligned.

3.Both the top and bottom combs are 6mm apart.

4.Comb sorter is placed with back toward the operator and top comb is lifted.

5.By using the clamping device all loose fiber are removed until straight edge of fiber is formed.

6. Fibers are now pulled out from right side to left side.

7.After placing all the fibers samples i present down into bottom comb with the help of depress and top comb.

8.The sorter is turned around so that it faces the operator.

9.Bottom Combs are dropped one by one successively till the longest fiber tip is expressed.

10.The exposed fibers are pulled out with the help of clamping device and placed on velvet board.

11.Rest of the combs are dropped in succession so, that the fiber are removed in decreasing order of length and this will give comb sorter diagram.

Diagram on graph paper

Analysis of Comb sorter diagram :-

Effective length can be determine by tracing the graph with following instruction :-

1.Half the maximum length OA at Q and determine the position P such that the perpendicular

 OQ =PP'

2. Mark  OK= OP/4 and draw perpendicular KK' cutting the curve at K'.

3.Half the KK' at S and determine the position of R such that the perpendicular RR'=KS.

4. Mark OL=OR/4 and draw perpendicular LL' cutting the 4 curve at L'.

5.The length represented by LL' is effective length.

6. Half the LL' at P and determine the position of U such that the perpendicular UU'=TL.

Practical Importance :- 

Length is essential property of fiber is use in carry out various setting of spinning the machine.

Example:- Setting b/w beatter & grid bars at below room temp. Setting between feed roller and licker-in, cylinder &doffer ,cylinder & grid bars in carding machine , Drafting zone setting in drawframe , speed frame and ring frame.

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