In this test, at the speed specified by the tensile machine, vertical uniform tensile force is applied to the adhesive surface of the sample, and the sample is peeled at an angle of 180Â° to measure the average strength required for peeling the aluminum foil and the PVC hard chip. Test equipment: automatic recording tensile tester, lever-type heat sealer, and standard test piece cutter.
1. Sample Preparation Requirements: 1 Sampling: Cut 100mmÃ—100mm test pieces in finished aluminum foil, meet the requirements of GB5663 for medical use PVC hard sheets 100mmÃ—100mm test pieces; 2 Heat sealing conditions: Lever type heat sealing The temperature of the instrument is 150-160Â°C, the pressure is 0.2Ã—104Pa, and the time is 1s. 3 Operation: The adhesive layer of the sample is laminated with the PVC sheet, inserted into a heat sealer for heat sealing, and cut into 15mm width with a standard cutter. For the sample, take the middle three for testing.
3. Test results: 1 The average value of the curve drawn by the automatic recorder is the heat seal strength value (unit: N/15mm width); 2 The heat seal strength can be expressed by the formula: Q=kÂ·L/b Medium: K-peel curve on the load unit represented by the load coordinate unit length N
Length of the load coordinate in the effective peel length on the L-peel curve mm
Bâ€”the width of the sample bonding layer mm
When L is calculated by a planimeter method, it should be accurate to 0.1 cm. If the peeling strength fluctuates beyond 15% of the average peel strength in the effective peel length, the test data of the sample is invalidated. Calculate the average value of each group of samples should take two significant figures, and apply the formula to calculate the standard deviation.
Third, the pharmaceutical aluminum foil and PVC heat seal strength test factors:
1. Bonding area: The heat-sealing strength of aluminum foil and PVC are expressed by the force per unit area. In the test, the size of the bonding area has influence on the bonding strength; the bonding area is too small, and the preparation of the sample is not easy. Accuracy, the relative error of the bonding measurement is also larger, the increase in the bonding area, the probability of bonding defects increases, so the determination of the heat sealing strength should be prepared according to the required width of the length of the sample.
2. The clamping method of the sample: At present, the adhesion performance of PVC and aluminum foil is generally determined by a pendulum pulling machine. According to the force measuring principle of the pendulum pulling machine, the force measured by the testing machine can be introduced as the force in the direction of the lead weight of the sample. If the direction of the force received by the sample deviates from the vertical direction, the measured force is The component force in the vertical direction is therefore smaller than the actual force applied to the sample. In other words, if the line of action of the force exerted by the specimen deviates from the vertical line passing through the center of the fixture, the test result will be low. Therefore, the center line of the fixture, the line of action of the force applied to the specimen, and the vertical The three lines coincide.
3. The tensile speed of the testing machine: the tensile speed of the testing machine is different from the selected value. The test results are different. With the increase of the tensile speed, the heat seal strength value increases. Therefore, the tensile speed of the tensile force must be specified as 200mm/min.

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