In the field of paint and coating quality inspection, the QTY-32 paint film bending Tester is an important device for evaluating the flexibility and cracking resistance of coating films. This article will show you how to use this instrument correctly to ensure accurate test results.
Scope of use and importance
QTY-32 paint film bending Tester is widely used to evaluate the anti-cracking or peeling performance of paints, varnishes and related product coatings when they are bent around a cylindrical axis under standard conditions. This is one of the important indicators to measure the performance of coatings and has important reference value for the selection of paint types. The equipment conforms to the GB6742 national standard.
Structural principles and parameters
How it works
Different coating films have different ductility to the substrate under different bending radii. The flexibility of the coating film can be determined by bending or peeling tests on different bending radii.
Main parameters
The device has a variety of shaft diameters, ranging from 2mm to 32mm. Use the adjustment handwheel to adjust the position of the shaft to ensure close contact with the template. Suitable for prototypes with thicknesses below 1.0mm.
Use and operation steps
Sample, coat, dry and measure thickness according to product standard requirements.
Place the instrument on the edge of the experimental bench for easy operation.
Select the appropriate shaft rod and insert it into the instrument base and fasten it with a manual lock.
Lower the pallet, insert the coating film of the sample plate face down between the shaft rod and the adjustment handle, and press the sample plate with screws and beads.
Lift the pallet so that the sample clings to the shaft rod.
Lower the adjustment handle to the lowest position and adjust the compression shaft on the handle so that it fits the template.
Lift the adjustment handle smoothly, bend the template 180 °, and then lower it smoothly.
Turn the adjustment handwheel, lower the pallet, and take out the sample.
Use 10x magnifying glass or a normal visual inspection template to record whether the coating is cracked or peeled off.
The diameter of the shaft that caused the first failure can be determined from the experimental results.
Precautions
During the bending operation, in order to avoid damaging the coating, a piece of tissue paper can be attached to the coating surface.
If using magnifying glass, please note.
If the minimum diameter shaft rod does not cause damage, it also needs to be recorded.
When not in use for a long time, the shaft rod should be coated with anhydrous Vaseline.
Finally, to ensure accurate test results, the test should be carried out under ambient conditions with a temperature of 23 ± 2 ℃ and a relative humidity of 50 ± 5%. Following the above steps and precautions, the use of the QTY-32 paint film bending Tester can effectively evaluate the performance of the coating film and provide reliable data support for coating selection and quality control.
