The Martindale Abrasion and Pilling Tester is used to determine the pilling of fabrics under slight pressure:

1. Under the specified load, the circular sample is rubbed with the abrasive (that is, the standard fabric) with the plane motion of the trajectory forming the Lissajous figure.

2. The specimen holder containing the specimen or abrasive is free to rotate about the axis of the Martindale Abrasion Tester perpendicular to the horizontal plane.

3. The sample holder or the abrasive is loaded according to the test method used. Its trajectory forms a plane friction motion of a complete Lissajous figure, including 16 frictions, that is, the two outer driving wheels of the Martindale Abrasion Tester rotate 16 circles, and the inner driving wheels rotate 15 circles.

4. The Lissajous figure specified by the standard is a figure formed by changing motion. From a circle to a gradually narrowing ellipse until it becomes a straight line, from which the straight line gradually reverses to a widening ellipse to a circle, repeating the movement diagonally.

However, the instruments produced by many small companies without production qualification and processing technology do not have the standard Lissajous trajectory at all, resulting in uncertainty in test results.

Standard Lissajous figure motion trajectory:

Remove the material from the grinding table, cover the surface of each grinding table with ordinary white paper with a diameter of (100±5) mm and a minimum unit area mass of 100g/m², and fix it on the grinding table to ensure that the surface is very smooth.

Insert the stainless steel sleeve with the same diameter as the sample pin shaft into the shaft sleeve of the sample guide plate in turn, and install a common ballpoint pen, so that the pen tip is in contact with the surface of the paper. Rotate the instrument so that the number of rubs is 16, forming a completed Lissajous figure.

Draw two parallel lines that just meet the outermost curves on opposite sides of the Lissajous figure. Draw two more parallel lines for the other two sides, making sure that the lines meet perpendicularly. Using the appropriate method, measure each side to an accuracy of ±0.2mm. Checking the 31 lines drawn, it is important to check the symmetry of the Lissajous figure. If the curves overlap each other or are not evenly spaced.

In the test process of the Martindale Abrasion Tester, the inspection of the Lissajous figure is an important indicator of product qualification. More about the Martindale Abrasion Tester: AVENO AG05 Martindale Abrasion and Pilling Tester

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