A brief introduction to Martindale abrasion and pilling tester

Introduction to Martindale Abrasion and Pilling Tester

The fabric to be tested is installed in the upper sample fixture and rubbed against the abrasive installed on the grinding table. The friction track is a Lissajous figure. After the friction times are set, the pilling is evaluated or the number of abrasions of the sample is recorded.

The unique design allows the experiment to be set up and checked without picking up the top guide. The instrument can count the number of frictions for each sample and the total number of frictions for the preset experiment. The instrument has a connection function, which allows the user to do different experiments at the same time. The instrument is equipped with a full set of sample clamps, and the optional loading blocks ensure that the correct pressure is applied to the test fabric. According to relevant standards, the movement trajectory of the sample in the abrasion resistance test is different from that of the pilling test. This instrument can change the movement trajectory according to the test method and customer requirements. The corresponding test parameters are shown in the following table:

Table 1: Large Lissajous curve (wear resistance test)

Transmission shaft speed (see Note 1) 47.5±2.5r/min; external transmission speed: internal transmission speed 16:15; external transmission shaft stroke 60.5±0.5mm; internal transmission shaft stroke 60.5±0.5mm; fixture insert diameter 28.65±0.05mm; guide plate and grinding table parallelism (see Note 2) <0.05mm; specimen fixture and grinding table gap <0.05mm; specimen fixture assembly (fixture, pin and loading block) mass 595±7g

Table 2: Little Lissajous curve (pilling test)

External drive shaft stroke 24.0 ± 0.5 mm; internal drive shaft stroke 24.0 ± 0.5 mm; specimen fixture friction area 64 cm2; fixture assembly mass (fixture, rubber ring and pin), for knitted fabrics 155 ± 1 g; fixture assembly mass (fixture, pin and loading block), for woven fabrics 415 ± 2 g

Table 3: Linear motion

External drive shaft speed (see Note 1) 47.5 ± 2.5 r/min; Lissajous figure size 60.5 ± 0.5 mm; fixture insert size 28.65 ± 0.05 mm; guide plate and grinding table parallelism (see Note 2) < 0.05 mm; specimen fixture and grinding table gap < 0.05 mm; specimen fixture assembly (fixture, pin and loading block) mass 595 ± 7 g

Note 1: Use a stopwatch to check the speed of the instrument and record the number of frictions within 5 minutes. The counter should also be checked to ensure normal function.

Note 2: Use a dial gauge to check parallelism.

Note 3: Use a feeler gauge to check the gap between the specimen fixture and the grinding table.

Instrument Calibration

After using it for a while, to confirm whether the instrument is set correctly, check the instrument with a pure black printed fabric. Run it normally for 7,000 times and check the color change of the sample. If it is uneven, the instrument is not set correctly and the settings listed above should be checked. It is recommended to check it regularly according to the usage. If the laboratory is doing abrasion and quality wear experiments, use two reference cloths to test at intervals until the end of the experiment. If the abrasion is uneven, it is recommended to check the parallelism of the grinding table.