How does the Brand tag detect if the paint is peeling?

Detecting whether Brand tag (brand label) paint loss need to be combined with the actual application scenarios and material characteristics, usually using the following scientific and systematic methods, covering laboratory testing and field simulation of the two major directions:

First. basic laboratory tests (core standards)
Scratch method (Cross-Cut Test)
Principle: the use of professional knives on the surface of the label cutting grid (spacing 1-2mm), affixed with tape and then quickly tear off, observe the paint film off the area.
Judgment standard: According to ASTM D3359 or ISO 2409 standard, shedding area ≤ 5% is qualified (0-1 level), shedding > 15% is judged as unqualified (more than 3 levels).
Applicable scenarios: metal, plastic and other rigid substrate labels, especially suitable for industrial or outdoor products.
Baguette knife + tape peeling test (upgraded version)
Tools: Pocketknife equipped with a guide device (to ensure consistent cutting depth), high-adhesive tape (e.g. 3M No. 600 tape).
Operation points: After cutting, use a soft brush to clean up debris, the tape should be torn off at an angle of 45 ° at a constant speed to avoid interference from human factors.
Data Record: Cutting pressure (e.g. 10N), adhesive value of the tape and ambient temperature and humidity (23±2℃, 50±5%RH) should be labeled.
Abrasion Resistance Test (Abrasion Resistance)
Equipment: Taber 5135 Abrasion Resistance Tester, loaded with 500g weights, using CS-10 grinding wheel.
Criteria: Paint film abrasion ≤ 0.1mm or no substrate exposure after 500 rotations.
Relevance: Simulate daily friction (e.g. backpack label rubbing against clothing), especially for textile labels.

Second. environmental simulation test (scenario-based verification)
Damp heat cycle test
Conditions: 85℃/85%RH environment for 48 hours, then turn to -40℃ for 2 hours, cycle 3 times.
Failure mode: paint blistering, peeling or substrate corrosion (e.g. metal label oxidation).
Criteria: No visible defects and loss of adhesion ≤ class 1 according to IEC 60068-2-30.
Salt spray test (for metal labels)
Conditions: 5% NaCl solution, 35°C continuous spraying for 96 hours.
Judgment: Corrosion area ≤ 0.5% (ISO 9227), corrosion extension at scratches ≤ 2mm.
UV aging test
Equipment: QUV accelerated aging instrument, UVA-340 lamp, irradiance 0.76W/m²@340nm.
Cycle time: 1000 hours (equivalent to 1 year outdoors), color difference ΔE≤3, gloss retention ≥80%.
III. Field simulation test (user scene reproduction)
Artificial accelerated wear
Method: Use Martindale abrasion meter, load 9kPa pressure, evaluate after 10,000 times of friction.
Case: A sports brand label needs to pass 2000 times of friction (simulating 1 year of daily use).
Chemical corrosion test
Reagents: 75% alcohol, sweat simulating solution (pH 4.7-7.5), sunscreen (SPF50+).
Time: No discoloration, dissolution or loss of adhesion after 24 hours of exposure.
Extreme temperature difference test
Procedure: -30℃ freezing for 24 hours → 60℃ baking for 2 hours, cycle 5 times.
Focus: Check the bonding strength between hot melt adhesive and paint film to avoid delamination.