Method of Testing for Raw Silk—Part 2

 

In addition to the winding test, size test and breakage length and elongation at break test mentioned in the part 1, the general inspection process of raw silk also includes evenness test, cohesion test, cleanness and neatness test, which will be introduced in part 2 continuously.

Evenness Test

Evenness is an indicator of the uniformity of the thickness of short segments of raw silk.
Under standard illumination condition, the degree of change in the diameter of the silk, as well as its’ transparency and roundness, can be determined by observing the changes in the brightness of the silk sample. The better the evenness of raw silk, the smoother and more uniform the shape of the silk fabric, and the better the color absorption balance.
Apparatus and Equipment Required
1) Seriplane: winding speed is 100r/min, quantity of slices on inspection panel can be adjusted;
2) Inspection panel: 1359*463 mm (L*W);
3) Evenness Standard Photographs;
4) Illumination room: Dark rooms equipped with lighting devices should be isolated from external light, and their walls and blackboards should be coated with black matte paint with uniform and consistent color.
Sample Preparation
Prepare 50 pieces of silk cone from winding test, take two slices from each cone; if the initial sample silk is on cones, take 20 cones directly without further preparation, and take 5 slices from each cone; wind 100 slices distributed on 10 blackboards evenly. The length of every slice is 127mm.

Cohesion Test of raw silk

By means of the Duplan cohesion tester, the number of frictions required to split silk thread for the purpose of examining the state of cocoon filaments sticking together, can be counted.
Sample PreparationThe sample for the test should consist of 20 test pieces taken out of winding test. The yarn should be free from any cleanness defect or apparent evenness defect in the portion, which is to be tested.
Inspection ProcedureThe test is performed in a room where standard humidity can be maintained during the test. The maximum speed of stroke should be 140 strokes per min. The machine should be stopped after every ten strokes and every single yarn inspected very carefully to see if there are any open places. As soon as ten different open spaces, 6 mm long and above are observed, they are recorded against the number of strokes which should be considered as the strokes of the thread opened. The record of the test is the average number of strokes of 20 test pieces. The result of cohesion is recorded by omitting the decimal.
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