1. Test device
Tensile testing machine (ST103 pharmacopoeia 180° electronic stripping testing machine) should make the test damage load in the full standard load between 15% ~ 85%;
The error of force value should not be more than 1%.
The testing machine with a drop speed of 300mm/min±10mm/min speed continuous stripping;
A drawing device that can automatically record the stripping load shall be attached.
The test board is stainless steel plate with thickness of 1.5 ~ 2.0mm, width of 50mm±1mm and length of 125mm±1mm.
The polyester film shall be 0.025mm in thickness according to JB1256-77 (6020 polyester film)
Film, the length of about 110mm, width should be greater than the test product about 20mm.
2. Determination method
Before the test, paste, patch (together with packaging materials) should be placed at 18℃ ~ 25℃, relative humidity 40% ~
Leave for more than 2 hours under 70% condition.
The back lining of the test product is fixed on the test board with double-sided tape. When necessary, tape can be used along the test product up and down two
The side edge is fixed so that the test product is fitted to the board smoothly.
The adhesive surface of the test product is bonded to the clean polyester film, and then 2000g pressure roller is used on the test product
Roll back three times to ensure that no bubbles exist at the adhesive joint.
After sticking, the test product should be placed at room temperature for 20 ~
Experiment after 40 minutes.
Fold the free end of the polyester film in half (180°), and clamp the free end of the film and the test plate up and down respectively
Test machine.
The peel surface should be consistent with the testing machine line.
The testing machine was 300mm/min±10mm/min
The falling speed is continuously peeled, and the peeling curve is drawn by the automatic recorder.
3. Result judgment
The peel strength shall be in accordance with the provisions of each variety.
180° peel strength σ (kN/m) of the test product was calculated as follows:
In the formula, S is the area within the value range of the recording curve, mm2;
L is the length within the value range of the recording curve, mm;
B is the actual width of the test product, mm;
C is the load per unit height of the recording paper, kN/m.
The test results were expressed as the arithmetic mean of the peel strength.
ST103 pharmacopoeia 180 ° of the electronic stripping tester in strict accordance with the new 2015 China pharmacopoeia 180 degrees in the act of 0952 adhesion force measurement method of peel strength requirements and design using modern mechanical design concept and the man-machine engineering design criteria, using advanced microcomputer processing technology carefully made reasonable design, is a novel design, easy to use, excellent performance, elegant appearance of a new generation of testing machine.
The sample is clamped between the two chucks of the clamp, the two chucks do relative movement, through the force sensor located in the moving chuck head and the machine built-in displacement sensor, the change of force value and displacement in the test process is collected, so as to automatically calculate the 180 degree peel strength of the sample.
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