Product Function and Application
The Four-Station Leather Crocking Tester is designed to evaluate the color transfer (crocking) resistance of leather surfaces or coatings by determining both the degree of color fading on the leather specimen and the staining level on the wool felt.
During the test, a white wool felt pad, either dry or wet, is wrapped around the rubbing head and moved back and forth across the test specimen under controlled load and stroke conditions. This instrument provides two test modes — dry rubbing and wet rubbing — allowing comprehensive assessment of color fastness under different use conditions.
It is widely used in leather manufacturing, automotive interiors, footwear, upholstery, and coated fabric testing.
Standards
ISO 11640Leather -- Tests for colour fastness -- Colour fastness to cycles of to-and-fro rubbing.
SATRA PM 173 Reference standard of footwear testing content and methods.
QB/T 2537-2001 Leather -- Tests for colour fastness --Colour fastness to reciprocating rubbing.
DIN 4843Safety Footwear; Safety Requirements, Testing
QB/T 2226 Shoelace wear test method, light industry standards.
GB/T 20991-7.3 Personal protective footwear test method.
Consumables
Friction material:
White wool felt, size 15mm × 15mm. The punched pure wool felt piece should meet the following requirements: pH of water extract between 5.5 ~ 7.0; mass per unit area (1750 ± 100) g / m2. thickness (5.5 ± 0.5) mm.
Technical Parameters
1. Test bench: a horizontal metal platform; a holder for fastening the leather to the platform, leaving approximately 80mm exposed; a device with which the leather may be extended 10% to 20% linearly in the direction of rubbing (sample size 120mm × 20mm).
2. Test column: weight (500 ± 25) g. It can be moved, but also firmly fixed. including:
A) Test head area: 15mm × 15mm;
B) Device for adjusting the test head to bring the felt pad into horizontal contact with the test platform;
C) Load bearing blocks: (500 ± 10) g. After loading, the total mass of the test column is 1000g;
D) Adjustment device: adjust the test column up and down so that the test head makes horizontal contact with sample.
3. Device that drives test bench for reciprocating motion: test head makes forward-backward motion with a stroke of 35mm ~ 40mm at a frequency of (40 ± 2) cycles / min.
4. Counter: LCD digital display, round-trip as one time, the number of cycles can be set to 5 to 500 times.
5. Device that can adjust the test column in the horizontal direction (optional):the test head can be rubbed against the leather samples at 2 to 3 different angles.
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