1.1 Working principle: The test plate with the sample attached is vertically hung on the test frame, and the weight of the specified weight is hung on the lower end, and the displacement of the sample after a certain time or the time required for the sample to completely detach is determined. Adhesive tape resists the ability to pull off.
1.2. Instrument structure: It is mainly composed of chronograph mechanism, test board, loading board, weight, frame and standard pressure roller.
1.3. Technical Specifications: Weight - 1000 ± 10g (including loading plate weight)
Test plate—60(L)*40(B)*1.5(D)mm (same as loading plate)
Roller load: 2000±50g Rubber hardness: 80°±5° (Shore hardness)
Timer - 99 hours, 59 minutes, 60 seconds, station - 6 stations
Net weight - 12.5kg power supply - 220V 50Hz
Dimensions - 600 (L) * 240 (B) * 400 (H) mm
2. Operation method:
2.1. Place the instrument horizontally, turn on the power switch, and place the weight in the slot below the hanger.
2.2. Unused stations can be stopped by pressing the “Close” button. Press the “On/Clear” button to re-time.
2.3. After removing the 3 to 5 ring adhesive tape on the outermost layer of the adhesive tape, unwind the sample roll at a rate of about 300 mm/min (the release layer is also peeled off at the same rate for the sheet sample). A sample of 25 mm wide and 100 mm long is cut in the middle of the adhesive tape at a distance of about 200 mm. Unless otherwise specified, the number of samples per group is not less than three.
2.4. Wipe the test and load plates with a wiping material and a clean cloth, then dry them carefully with clean gauze, and wash them three times. Above, until the working surface of the board is visually inspected and cleaned. After cleaning, do not touch the working surface of the board with your hands or other objects.
2.5. At a temperature of 23 ° C ± 2 ° C, relative humidity of 65% ± 5%, according to the size specified in Figure 2, the sample is pasted parallel to the longitudinal direction of the plate in the middle of the test plate and the loading plate next to each other. The sample was rolled at a speed of about 300 mm/min with a press roll. Note that when rolling, it can only be applied to the specimen with the force generated from the quality of the press roll. The number of rollings can be specified according to the specific product conditions. If there is no regulation, the rolling is repeated three times.
2.6. After the sample is pasted on the board, it should be placed at a temperature of 23 °C ± 2 ° C and a relative humidity of 65% ± 5% for 20 min. Then the test will be carried out. The plate is fixed vertically on the test stand, and the load plate and weight are gently connected by pins. The entire test rack is placed in a test chamber that has been adjusted to the required test environment. Record the test start time.
2.7. After reaching the specified time, remove the heavy objects. Use a graduated magnifying glass to measure the amount of displacement of the sample down to the nearest 0.1 mm; or record the time the sample has fallen off the test panel. The number of times is greater than or equal to 1h, in min, and less than 1h in.