Pressure Sensitive Adhesive Tape Initial Viscosity Test Method Demonstration

1 Pressure-sensitive adhesive tape test method of initial viscosity
This standard applies to pressure sensitive adhesives to test the viscosity.
2 pressure sensitive adhesive tape initial viscosity test method definition
Initial Viscosity - When the object and the adhesive surface of the pressure-sensitive adhesive tape are briefly contacted with a slight pressure, the adhesion of the adhesive tape to the object is called initial tackiness.
3 Principle of initial viscosity test method for pressure sensitive adhesive tape
A steel ball is rolled over the adhesive side of the adhesive tape lying flat on the inclined plate. According to the maximum length of the sticky surface can stick to the size of the ball, to assess the size of the initial viscosity.
4 Pressure-sensitive adhesive tapes for initial tack test method test equipment
4 . 1 ramp device
The device is mainly composed of an inclined board, a ball putter, a bracket, a base and a receiving box.
4 . 1 . 1 Tilting plate: Tilting plate is made up of a glass plate with a thickness of about 2 mm over a steel plate with a thickness of about 7 mm . Between two poles can be inserted into the millimeter seat
Marking paper, as a mark for placing the sample and adjusting the starting position of the steel ball.
4 . 1 . 2 Ball putter: The ball putter should be able to adjust the starting position of the steel ball on the inclined board. When releasing the steel ball, there should be no additional force on the ball.
4 . 1 . 3 Bracket: The bracket is used to support the inclined plate, and the inclination of the plate can be adjusted within the range of 0 to 60° .
4 . 1 . 4 Base: The base should be able to adjust and maintain the level of the device.
4 . 1 . 5 Ball box: The ball box is used to receive rolled steel balls on the board. The inner wall is lined with soft materials.
4 . 2 steel balls
In GCr15 bearing steel, accuracy no less than GB 308 - 77 0 level which is specified, "ball", and 1 inch in diameter 33 kinds
Steel balls can be used as test balls.
The ball is numbered according to 32 times its imperial diameter. A continuous ball of balls shall be used for testing.
Balls should be stored in anti-rust oil. Balls with rust and scars must be replaced in time.
4 . 3 polyester film
The thickness is 0 according to JB 1256 - 77 " 6020 Polyester Film". 025mm film. Its length is about 110mm , wide
The degree is about 20 mm wider than the sample.
4 . 4 cleaning agents and wipe materials
4 . 4 . 1 Detergent: Detergent can use chemically pure acetone, ethyl acetate, alcohol and other suitable solvents.
4 . 4 . 2 Wiping materials: Soft fabrics such as absorbent gauze are used as wiping materials. This material should not contain soluble
Solvent material.
5 pressure sensitive adhesive tape initial tack test method test conditions
5 . 1 The test chamber temperature was 23±2 °C and the relative humidity was 65±5 %.
5 . 2 Before the preparation of the sample, the adhesive tape should be removed from the packaging material, without overlapping each other in 5 . l Place 2 hours or more under the conditions.
6 pressure sensitive adhesive tape initial viscosity test method sample
The width of the sample is 10 to 80mm and the length is about 250mm . After removing the outermost 3 ~ 5 turns of adhesive tape, it is solved at a speed of about 300mm/min .
Uncoiled adhesive tape (on the sheet material is peeled off at the same rate of its isolation layer), cut a sample every 200mm or so, take four
on. When the specimen has a large tensile deformation, it is allowed to have a parking time of no more than 3 min to restore it.
Do not allow hands or other objects to come in contact with the test section during sampling.