What are Martindale rubs, cycles and Lissajous?
What are rubs, cycles and lissajous patterns in Martindale abrasion and pilling testing?
Rub:
One revolution of the two outer drives of the Martindale Abrasion and Pilling Tester. This is what is counted by the totalisers.
Cycle:
Completion of all the translational abrasion movements tracing a Lissajous figure comprising 16 rubs, i.e. 16 revolutions of the two outer drives and 15 revolutions of the inner drive of the Martindale Abrasion and Pilling Tester.
Lissajous:
Figure created by movement which changes from a circle to gradually narrowing ellipses, until it becomes a straight line, from which progressively widening ellipses develop in a diagonally opposite direction before the patter is repeated.