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Humidity: 65±5%RH
2. The sample sample should be parked for no less than 24 hours in the test environment.
The 3 layers outside the tape should be discarded. When cutting the test piece, the adhesive surface must not touch fingers or other objects.
3, the thickness of the thickness meter: percent or 1000 (according to actual needs)
Measurement: After the entire roll of tape is pulled open, the adhesive is oriented upwards, and then the average thickness is measured at 3 points or more for each equivalent distance.
4, the width of the interception of about 30cm long test piece, placed 20min, and then measured with a vernier caliper, take its arithmetic mean.
5, the length of the entire roll stripping, plastic side, placed 1H, the amount of tape can be, and check the number of joints.
6, degumming the whole roll degumming, from the edge of the head at a speed of 3-5 seconds per meter to open, to see if there is adhesive residue on the back.
7, early sticky rolling ball: 1/32-1 inch diameter stainless steel ball.
Test piece: 50mm*300mm
Procedure: Place the table on a flat glass plate, adjust the angle of the table of the table to 30 degrees, and wipe the surface of the table with a volatile solvent (ethyl acetate). The sample must be kept flat, and then The wiped ball is placed in the ball putter on the upper end of the table with a tweezers, and then the ball valve is gently pressed. The ball immediately slides down the inclined table to the test piece, selects the size of the ball, and adjusts the ball The different trajectories of the slide, record the maximum ball number.
8, 180 °C peel strength equipment: Rally machine fixed speed 300mm per minute
Steel sheet: 304 or 302 stainless steel Size: 120mm*400mm*2.35mm
Pressing roller:
Roller width 45mm, diameter 83mm, weight 2000±50g outside the metal runner is 6mm thick sulphur rubber, hardness 80±5
Step: The surface of the steel sheet is first wiped with cotton wool soaked in a volatile solvent (ethyl acetate), left for 5 minutes to completely dry the surface, and then the plastic sheet is cut open (width 25 mm, length about 250 mm) 3 pieces, each gently Fitted in the center of the steel sheet, and then pressed with a 2000g pressing roller on the steel sheet to align the test piece with a pressure of 300mm/min. (no bubbles are generated) After rolling, the steel sheet is projected to introduce the film or The anti-folding is clamped at 180 degrees to the back of the other chuck. When the pulling machine is started, it is recorded (except for 15% and 85%). Take the mean value of the three pieces on the memory for arithmetic mean. Double sided tape test can be affixed to the other side with 0.02-0.03mm OPP or polyester film for operation.
Note: For the back of the plastic force, the first adhesive with the tape on the steel plate, and then the above steps experiment.
9, holding sticky equipment: CN-4851 pressure sensitive adhesive tape holding instrument.
Steel sheet: 302 or 304 stainless steel Size: 25mm*(25mm+45mm)
Press the roller: the same as the above steps: first with absorbent cotton immersed in ethyl acetate wipe test plate and loading plate. The test piece was stuck in the middle of the test plate and loading plate parallel to the longitudinal direction of the plate. Roll the plate back and forth three times at a linear velocity of 300 mm/min with a pressing roller. After the test piece is affixed on the board, it shall be placed under the test conditions for 20 minutes. Then, the test board shall be vertically fixed on the test rack, and the load plate and the weight shall be lightly connected with the pin by 1 kg. Record the test start time until the test piece slides off the steel sheet. Measure the time and take the average of three times. Select the test temperature as 23±2°C and 40±2°C depending on the tape.
Pressure-sensitive adhesive tape inspection method
1, the test room ambient temperature: 23 ± 2 °C