JIS Colour Fastness Rubbing Tester (Gakushin)

The Japanese Standard Color Fastness to Rub Tester (Gakushin) is a specialized instrument designed to evaluate the colorfastness of textiles to friction and abrasion, adhering to JIS L 0849 (Japanese Industrial Standard). It quantifies color transfer and staining resistance under controlled rubbing conditions, critical for ensuring compliance with Japanese textile quality requirements.

Applications

Textile Manufacturing: Testing dyed fabrics for consumer goods

Quality Control: Batch inspection of apparel and home textiles

R&D: Developing fade-resistant dyes and finishes

Forensic Analysis: Evaluating wear-induced color degradation

Standard Operation Workflow:

Sample Preparation: Cut to size, clamp in test frame

Parameter Setup: Select cycle count and rubbing force

Testing: Initiate automated rubbing cycles

Analysis: Measure color transfer via spectrophotometer

Cleaning: Automated pad decontamination

Safety Precautions:

Avoid contact with moving parts during operation

Use heat-resistant gloves when handling samples

Maintain ventilation in testing area

* JIS-certified felt pads and calibration weights * NIST-traceable colorimeter * Energy-efficient low-power motor * Includes 5-year mechanical warranty * Compact design for lab/bench use**Technical Highlights**- ±0.5 ΔE color measurement accuracy (JIS-compliant) - 10.000-cycle fatigue testing mode - Real-time digital staining grading software - Motorized load adjustment (500g precision) - CE/IECEx certified for safe operation

Standards

JIS L 0849 :Colorfastness to rubbing

ISO 105-X12 :International colorfastness test

AATCC 8:Durability of colorfastness

GB/T 3920 :Chinese textile abrasion standard

Features

JIS L 0849 Compliance:

Simulates real-world friction (e.g., garment rubbing)

Standardized felt pad and load system

Advanced Features:

Real-time color difference analysis (ΔE)

AI-based staining classification (5 severity levels)

Anti-slip clamping mechanism

Automation:

Programmable cycle counter

Motorized rubbing head

Self-cleaning abrasive pad holder

Technical Parameters

Accessoriess

1. Flat test platform;

2. Transparent resin safety cover for high safety;

3. 1.5 R friction head (radius of curvature 1.5mm);

4. Sharp-angled friction head (for testing flocked products);

5. Load weights (300g, 500g, 800g);

6. Fixing device for thick test fabrics (maximum thickness 8mm);

7. Flat friction head (20×20mm, for testing printing inks and coatings).

Test Procedures

1. Pre-operation Preparation

First, adjust the working environment to meet JIS L0803 standard conditions: temperature 20±2℃ and relative humidity 65±3%. Acclimatize both the instrument and test samples in this environment for at least 4 hours. Then, cut textile samples into 150mm×50mm pieces (one piece per workstation), ensuring no wrinkles or defects. Finally, check the instrument: confirm it’s connected to the correct power supply (e.g., AC 220V/50Hz) and inspect rubbing heads and workstations for intactness.

2. Parameter Setting

Turn on the "Power" button on the control panel. Set test parameters according to relevant JIS standards (e.g., JIS L0849 or JIS K6328): adjust the pressure to 4.9N (the standard value for JIS tests), set the reciprocating speed to 30 cycles/min, and input the required rubbing cycles (e.g., 20 cycles for JIS K6328). Verify all parameters on the digital display to ensure accuracy.

3. Loading Samples & Crocking Cloth

For each workstation, fix the prepared sample flat on the test stage (use clamps to avoid displacement during testing). Attach a JIS L0805 standard white crocking cloth (50mm×50mm) to the bottom of each rubbing head, and secure it tightly with the clamping ring to prevent slipping during friction.

Initiate the TestAfter confirming all samples and components are properly installed, press the "Start" button to begin the test. Monitor the instrument’s operation throughout; if abnormalities occur (e.g., sample shifting, unusual noise), press the "Emergency Stop" button immediately. The instrument will stop automatically once it completes the preset rubbing cycles.

4. Post-test Handling

Press the "Stop" button, then carefully remove the crocking cloths and tested samples. Evaluate the results using the JIS L0805 grey scale: grade both the staining of the crocking cloth and the discoloration of the sample (on a scale of 1 to 5. where 5 indicates the best fastness). Record all test details (sample information, set parameters, and evaluated grades) in a test log for future reference.

5. Instrument Cleaning & Storage

Turn off the power and disconnect the instrument from the power supply. Wipe the sample stage, rubbing heads, and control panel with a dry, clean cloth to remove debris. Store unused standard crocking cloths in a dry, sealed container, and keep the instrument in a dust-free, dry environment when not in use.

YouTube video introduction:https://www.qinsun-tester.com/other/6328.html