Tuesday, April 7, 2020

TESTING OF SNAGGING RESISTANCE OF THE FABRIC BY ICI MACE SNAG TESTER


SNAGGING RESISTANCE OF THE FABRIC:

The snagging resistance is a special type of abrasion. A portion of the fabric structure catches on an abradent material with some resulting change in the fabric appearance, structure of the fabric or yarn in case of snagging. The snagging gets occurred when an object pills, plucks, scratches, or drags a group of fibres, a yarn, or a yarn segment from the normal pattern of the fabric.

The snagging can be classified in main below categories:

1 - snagging having a protrusion and no distortion

2 - Snagging having distortion and no protrusion.

3 - Snagging having both protrusion and distortion.

The protrusion and distortion also influence the visibility of the fabric, so that other changes like colour contrast is also reported. The pictures of different types of snagging are given below:






TESTING OF SNAGGING RESISTANCE OF THE FABRIC By ICI MACE SNAG TESTER:

APPARATUS USED:

The main apparatuses using in the test of snagging resistance of the fabric are given below:

1 - ICI mace tester

2 - Fabric.

3 - Scissor.

4 - measuring scale.

5 -  Marking pen.

6 - stitching machine.

7 - standard calibration fabric and visual rating standard

(i) fabric standard

(ii) photographic standards

SPECIMEN PREPARATION:

The marking of specimen size is performed with the help of template and marking pen. The size of the specimen is kept according to the circumference and length of the rotating cylinder. The stitching margin is also left in length and width.

TESTING PROCEDURE:

A tube of cut specimen is constructed by stitching the specimen. The tube size is kept according to the rotating cylinder.  The diameter and length of specimen's tube ( green) is kept according to the rotating cylinder as shown in below schematic diagram.



This specimen's tube is mounted carefully over the rotating cylinder. This tube is kept tight with the help of 'O' rings ( elastic ring) over the rotating cylinder. Two  ' O' rings are used for each cylinder.

Now a spike ball suspended with the help of steel chain is placed over the rotating cylinder.
All required settings are done with the help of the gage.

Finally the power supply is switched on and timer resets. The required testing time 30 seconds are entered into the timer.

The technician pushes start button. The rotating cylinders get started to rotate in the clockwise direction as shown in the diagram. A spiked ball bounces randomly against the fabric as the tube rotates.

When the entered time reaches to completion, the machine gets stopped immediately. The elastic rings are taken off and this specimen's tube is dismounted from the cylinder.

This specimen is compared with snagged fabric standard or photograph.

The specimen is rated on 1 - 5 scale.

1 ( very severe snagging)

5 ( no snagging)

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