The QTY-32 film flexure Tester is used to test the flexibility of basecoat and varnish coating films, and to evaluate the resistance of coatings to cracking or peeling at different bending radii. The instrument conforms to the GB6742 standard, has a variety of shaft rod options, and is suitable for coating film samples with a thickness of less than 1mm. During operation, whether the coating film cracks or peels off is the key to determining its flexibility. The test environment requires a temperature of 23±2°C and a relative humidity of 50±5%. This Tester has an important application in the performance testing of coatings.
First, the scope of use
The QTY-32 paint film bending Tester is mainly used to determine the coating film flexibility of color coats, varnishes and related products, and to evaluate the cracking resistance of coatings under specific conditions and the ability to peel off metal substrates. This equipment provides the coatings industry with an important tool for measuring the flexural properties of coating films, especially the ductility of coatings when bent by force. The Tester conforms to the GB6742 national standard and is widely used in coating quality testing, coating selection and research and development processes. By testing the performance of the coating film under different bending radii, it can effectively provide a basis for the applicability of the product.
2. Structural principles and parameters
How it works
The principle of the QTY-32 paint film bending Tester is to test the flexibility of the coating film by bending the coating film under different bending radii. If the coating film cracks or peels off the substrate after bending, it is a sign that the coating film is less flexible. According to the different bending radii and the failure of the template, the anti-cracking ability and ductility of the coating film can be judged.
Main parameters:
Shaft diameter - The equipment provides a variety of diameters of shaft rods, namely 2mm, 3mm, 4mm, 5mm, 6mm, 8mm, 12mm, 16mm, 20mm, 25mm, 32mm, etc., users can choose the appropriate shaft diameter according to the testing needs.
Applicable sample thickness - this instrument is suitable for coating samples with a thickness of less than 1.0mm.
Test operation mode - by adjusting the handle, adjusting the supporting plate and the hold-down shaft, so that the sample is close to the shaft rod for bending operation. During operation, it is necessary to ensure that the surface of the sample is not affected by other substances to avoid external interference affecting the test results.
3. Use and Operation
Sample preparation
Before starting the test, the coating is applied, dried and the thickness of the coating film is measured according to the standard requirements of the coating product. Ensure that the coating is uniform and flat, with no visible surface defects. Prepare a prototype that meets the test conditions, usually sheet metal.
Install the Tester
The QTY-32 paint film flexure Tester is placed on the edge of the experimental bench to ensure that it is easy to operate and the equipment is firmly fixed. Insert the adjustment handle into the flexure test area of the template.
Select the shaft rod and install it
According to the needs of the model, select the appropriate shaft rod diameter. Insert the base of the Tester and tighten it with a manual locker to ensure that the shaft rod is held in place.
Template placement and pressing
With the film side facing down, insert the sample between the shaft rod and the adjustment handle. Use fastening screws and beads to secure the sample to the pallet of the Tester to ensure that the sample does not move during operation.
Adjust and perform the bending operation
By rotating the adjusting handwheel, the supporting plate is lowered to make the template adhere to the axle rod, and the template is fixed in place. Then, the adjustment handle is operated so that the hold-down shaft fits snugly against the plate, and a flexure test is performed. Make sure to smoothly lift the Tester 180° in 1-2 seconds to ensure that the coating film bends evenly during the test.
Sample removal and testing
When the bending is complete, use the adjusting handwheel to lower the pallet so that the bending template leaves the shaft rod. Check the condition of the coating film immediately. Use normal visual acuity or 10x magnification to inspect the specimen for cracking or peeling off (excluding coatings with edges smaller than 10 mm). If you use a magnifying glass, you should indicate the results of your observations.
Confirmation of the diameter of the shaft of destruction
Depending on the damage of the coating film, the shafts of different diameters are tested sequentially from large to small until the coating film cracks or peels off. The smallest shaft diameter is recorded as a test result, and if there is no damage to the coating film at the minimum diameter, this should be noted.
4. Precautions when using
Template Protection-To prevent damage to the coating during bending operations, a layer of tissue paper can be applied to the surface of the sample film to reduce the impact on the film during operation.
Observation conditions-When using a magnifying glass, be sure to indicate the magnification (10x) of the magnifying glass to ensure that the test result is accurate.
Precautions for the use of the smallest diameter shaft-If the smallest diameter shaft does not crack or peel off without filming, be sure to document this result and indicate the diameter of the shaft rod used.
Template Orientation-For aluminum plate templates, the long side should be tested parallel to the calendering direction to ensure the standardization and accuracy of the test.
Long-term maintenance-If the equipment is not used for a long time, all shaft rods should be coated with anhydrous petroleum jelly to avoid rust and prolong the service life of the equipment.
5. Test environmental conditions
To ensure the accuracy of the test results, the test should be carried out under the environmental conditions of 23±2°C and 50±5% relative humidity. Testing in an environment that does not meet these conditions can lead to inaccurate results.
6. Summary
QTY-32 paint film flexure Tester is an important coating performance evaluation tool, which can effectively help enterprises and research institutions select suitable coating products through the test of coating film flexibility. With proper operation and maintenance, it is possible to ensure its accuracy and reliability, extend the service life of the equipment, and obtain accurate test data.
