Overview
QTZ type paint film Conical Mandrel Bending Tester is a product of HuiNuo brand. It is mainly used to determine the anti-cracking or disbonding performance of Paints and varnish coatings (including single layer and composite coating systems) under standard conditions when bending around conical mandrel. It can also be used to determine the elongation of the coating.
Features
1. Pure mechanical structure, easy to operate.
2. The core components include conical mandrel, tie rod, joystick and clamping plate device.
3. Suitable for evaluating coating flexibility and adhesion.
Principle
The instrument is a purely mechanical structure. The Working Principle is to insert the test plate between the tie rod and the conical mandrel and clamp it with a splint, and turn the conical mandrel from front to back by holding the lever in hand to bend the test plate around the conical mandrel. According to the location of cracks in the coating on the test plate, its anti-cracking or disbonding performance is determined.
Applications
Paints coating test, varnish coating test, single layer coating system test, composite coating system test
Standards
ISO6860—1984（E）、ASTMD522—60（1979）、BS3900；PartE11:1985、GB/T11185
Steps
1. Lay the instrument flat or fix it on the instrument platform.
2. Test plates are prepared and processed according to standard requirements (including sampling, painting, drying and thickness determination).
3. Insert the processed test plate between the tie rod of the instrument and the conical mandrel.
4. Use a splint to clamp the test plate.
5. Holding the lever, flip the conical mandrel from front to back to bend the test plate around the axis.
6. Observe and record the crack location of the coating on the test plate to evaluate its performance.
Notice
- Unless otherwise requested, the test shall be carried out at 23 +/- 2 ° C and relative humidity (50 +/- 5) %.
The instrument should be placed flat or fixed on the instrument platform for operation.
- The preparation, processing and painting of the test plate must be strictly in accordance with relevant standards (such as GB3186, GB1727, GB9271).
- The test plate should be flat, no deformation, no bulge or crazing on the surface, the size is 100mm * 180mm, and the maximum thickness does not exceed 0.8mm.
- After painting, the test plate should be dried according to the specified time, and the bending test should be carried out as soon as possible after being placed under the standard temperature Humidity conditions for at least 16 hours.
- The film thickness should be determined according to the standard method before the test.
