T-Bend Tester - Senze-Instruments Benelux

Senze-Instruments BENELUX
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Process & Quality Control

T-Bend Tester

Coatings & Industry > Mechanical properties > Flexibility and toughness
T-Bend Tester

T-Bend Tester is designed to evaluate the flexibility and adhesion of an organic coating on a metallic substrate by observing the cracking or loss of adhesion when a coated test panel is bent.
This method can be used to confirm whether paints, varnishes or related products meet a given test requirement in a pass/fail test, or to determine the minimum bending diameter at which cracking does not occur.

This instrument complies with the ISO17132.

Manual  bending machine / bend tester machine equipment test
Scope of application:
Film flexibility is a measure of paint one of the important indicators of the new varieties of paint formulations of screening applications have great reference value.
The Bending Tester is a new model for testing the flexibility of coatings.
It is suitable for testing the T-Bending Tester of coated steel sheets and strips, as well as T-Bending Test instrument.

Manual  bending machine / bend tester machine equipment test
The main structure:
Floor and left and right side panels.
Gear and crank lift mechanism.
Triangle bent Yaping fast.
Square rotation split pieces.
Guard and handle and other components.


Operation steps:
Coated panels are bent back on themselves to 180º, with the coated surface on the outside of the bend, at progressively less severe radii of curvature, the radii of curvature being defined by spacers or mandrels.
1. Specification: 400 × 100 (mm)
2. Specimens should be placed in a 23 + 2 ° environment for at least 24h before cutting, and the test should be carried out under the same conditions.
3. Turn the handle on the right side so that the triangular bending crimp block in the middle of  the testing machine picks up (≥10mm): Turn the left handle at the same time, so that the squareturning split block and the triangular bending flat block become straight with the bottom surface status.
(1) Triangle bending flattened quickly
(2) Sample plate
(3) Square rotation split pieces
(4) The bottom plane
4. The sample plate is side down and into the triangle bending flattened quickly 15mm, turn the right handle, the triangular bending flattening  lock down, pressing the sample plate: Turn the left handle, so that the square rotation split The test board is bent, at which point the test board forms an angle of <45 °.
5. Turn the handle on the left side, so that the square rotation of the split unit back to its original position: Turn the right handle, so that the triangle bending flattening block, remove the sample plate.
6. Will form a trial class <45 ° angle into the triangular bending flattening block: Turn the right handle, the triangle bend flattening block down, then the angle of the test plate to be compacted, the shape of a head is Thickness dimension arc and two parallel faces. That is to complete the "OT" bend.
7. Repeat the above test procedure to compact the bend of the test plate "OT" and bend and flatten it so that there is an intermediate layer of test plate thickness at the bend. That completed the "IT" test.
8. Follow the above steps to repeat the experiment, you can get "2T, 3T" ... ... Bending
Experimental results to determine:
After bending, each panel is examined :
  • with a magnifying glass for cracking of the coating
  • and by a tape pull-off test for loss of adhesion of the coating.
The minimum diameter to which the test panel can be bent without cracking or loss of adhesion,i.e.when failures on longer occur, is taken as the T-bendrating.
Use Scotch tape (≥0.25N / mm) against the curved surface of the test, flatten the tape with your fingers, and then peel it off in the direction perpendicular to the coating surface to check if the coating is peeled off or peeled off Determine the flexibility of the coating.
Caution:
1. When the specimen is bent at IT, there should not be any obvious gap at the bending surface.
2. Coating damage within 10mm from the edge is not taken into account.
3. In order to facilitate the transport, the test machine out of the company, the two handles are not installed on the host.
After the user devanning, with the wrench will be installed on the host two handles the appropriate position, and be careful to tighten.

It conforms with DIN EN ISO 17132, ASTM D 4145, EN-13523-7 (Paints and varnishes – T-bend test).
Standards :

ISO 17132:2007 describes a method of evaluating the flexibility and adhesion of an organic coating on a metallic substrate by observing the cracking or loss of adhesion when a coated test panel is bent.
The method can be used to confirm whether paints, varnishes or related products meet a given test requirement in a pass/fail test, or to determine the minimum bending diameter at which cracking does not occur.

Manual  bending machine / bend tester machine equipment test
Main Specifications:
One bend angle <45 °
Flatten the body stroke: ≥ 10mm
Test sample plate (steel, aluminum) Thickness: 0.5 ~ 1.0mm
Pressure plate (steel, aluminum) width: ≤ 100mm
Max. thickness for sample:             1.0mm (steel panel);
                                                                       2.0 mm(aluminum panel)
Width of panel:                                      <100mm
Weight:                                                       50kg
Size:                                                              300×300×190mm (length by width by height)
Ref.                                                                298-BGD-568
Manual  bending machine / bend tester machine equipment test
Working principle:
Through the rotation of the left handle, the square bending buckle bending pieces parallel to the shape of <45 ° angle: turn the right handle, driven by the crank lift mechanism so that the triangle bending fast rise or fall, the specimen clamping or pressure Flat, form a T-bend.

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