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Test method for initial adhesion of pressure sensitive adhesive tape by inclined rolling ball method

Date: 2021-12-24 09:46
Views: 1023
Abstract:

Test method for initial adhesion of pressure sensitive adhesive tape by inclined rolling ball method

1、 Scope
This method is suitable for testing the initial adhesion of pressure-sensitive adhesive tape and products similar to pressure-sensitive adhesive tape.

2、 GB / t4852-2002 "test method for initial adhesion of pressure sensitive adhesive tape - rolling ball method", and test method for initial adhesion of pressure sensitive adhesive tape - inclined rolling ball method

3、 Definition
This method adopts the following definitions:
Initial tack
When the object and the adhesive surface of the pressure-sensitive adhesive tape contact with each other for a short time under a small pressure, the adhesion of the adhesive tape to the object is called initial adhesion.

4、 Principle
A steel ball is rolled over the adhesive surface of the adhesive tape lying flat on the inclined plate, and the initial viscosity is evaluated according to the size of * large steel ball which can be adhered by the adhesive surface of specified length; Or roll a steel ball too small through the inclined groove, and measure its rolling distance on the adhesive surface of the adhesive tape on the horizontal plate to evaluate its initial adhesion size.

5、 Test conditions
1. Unless otherwise specified, the laboratory temperature is 23 ℃± 2 ℃ and the relative temperature is 50% ± 10%.
2. Before preparing the sample, the adhesive tape should be removed from the packaging material and placed for more than 2 hours under the condition of 5.1. Test method for initial adhesion of pressure sensitive adhesive tape -- inclined rolling ball method

6、 Test piece
For the adhesive tape with large elongation, after sampling, it should be placed until the extension is basically restored before the test.
Specimen size: width (10-80) mm, length more than 250 mm.
Number of test pieces: no less than 4.

7、 Methods a slope ball rolling method, pressure-sensitive adhesive tape initial adhesion test method inclined rolling ball method
1. Test device( Viscosity tester
1.1. The inclined surface ball rolling device is composed of inclined plate and its connecting structure which can be tilted for 20, 30 and 40 degrees.
1.1. 1. Inclined plate
The inclined plate adopts smooth hard flat plate (glass plate, metal plate, wood plate, plastic plate, etc.).
1.1. 2. Roll aid section
The length of the auxiliary rolling section is more than 100 mm and the thickness is about 25 μ The transparent polyester film of M is pasted on one of the test pieces at the specified position. The length of the auxiliary rolling section is 100 mm.
1.1. 3. Determination section
The measuring section is the adhesive surface within the range of 100 mm from the lower end of the rolling aid section.

1.2 rolling balls: the following standardized rolling balls are adopted:
1.2. 1. The material is made of GCr15 bearing steel, and the accuracy level of shape tolerance and surface roughness of steel ball shall reach grade 40 or above specified in GB / T 308.
1.2. 2. The ball number and corresponding nominal diameter of the ball are shown in Table 1.

2. This paper introduces the testing methods of initial adhesion tester, tape initial adhesion tester, pressure sensitive adhesive initial adhesion tester, inclined rolling ball method initial adhesion force tester, adhesive tape initial adhesion tester, initial adhesion testing machine,
2.1. Fix the ball rolling device horizontally on the test bench with a level instrument. The standard angle of the inclined surface is 30 ° and 20 ° or 40 ° can be taken if necessary.
2.2、 At the lower end of the test piece, use positioning adhesive tape or weight respectively (mass about 500g), fix the test piece on the specified position with the adhesive facing up. Paste the rolling aid section on the specified position of the adhesive surface of the test piece with polyester film. When pasting the polyester film, do not make bubbles inclusion or wrinkling, and do not add large pressure. When fixing the test piece, pay attention not to make it warping or bulging. If bulge occurs at the edge part, then Use other adhesive tape to fix this part on the inclined surface.
2.3. In order to keep the length of the auxiliary rolling section at 100 mm, adjust the center of the ball on the starting position of the ball according to the size of the ball as shown in Figure 1.
2.4 take out the ball stored in the antirust agent with tweezers according to 7.2 5. After cleaning, place the ball on the starting position and let the ball roll down through the auxiliary rolling section.
2.5 cleaning of test roller ball: the surface of test roller ball shall be cleaned with degreasing gauze material 1) dipped with solvent, 2) scrubbed and cleaned. After the surface is dry, clean the surface with new cleaning gauze with solvent for more than three times until it is considered clean by visual inspection.
Note: 1) there is no gauze and non-woven fabric dropped by short fiber during scrubbing, and it does not contain solvent soluble substances.
2) Naphthenic hydrocarbon, solvent oil, oil essence, isopropanol, toluene and other reagent grade or industrial grade solvent without residue.
2.6 pre selection of * large steel ball
Adjust the starting position, repeat the cleaning, rolling and other operations of the ball with different sizes of balls, From stop in measurement section In order to confirm the steel ball with * large ball size, take out the * big ball found in the same test piece and the size of the ball number adjacent to it, and conduct a test on the same sample to confirm the steel ball with * large ball size. Before picking out the * big ball, it is OK to roll on the same test piece for several times, but it can not be treated as the formal test data.
2.7 formal testing
Take three samples and conduct ball rolling test with * large ball size steel ball. If a sample can not adhere to the steel ball, it can be replaced by a steel ball with a ball number less than it. If there is still a steel ball that can stick, if it still can not stick, it must be in accordance with 7.2 6-2.8, step retest.

3. Test results of initial viscosity tester
The test results are expressed by the median (ball number) of the ball rolling test results of the three specimens during the formal test.
Test method for initial adhesion of pressure sensitive adhesive tape -- inclined rolling ball method
8、 Test report
The test report includes the following contents:
(a) The number and name of this standard, and the test method used for glue;
(b) The inclination angle of the inclined plate;
(c) Description of adhesive tape for test, including type, source, number of sample tapes, manufacturer's name, brand, specification, batch number, batch number, etc;
(d) The test method for the initial adhesion of pressure sensitive adhesive tape is inclined rolling ball method
(e) Others. Tape initial adhesion tester, pressure sensitive adhesive tape initial adhesion tester, slope rolling ball method initial adhesion force tester, adhesive tape initial adhesion tester, initial adhesion tester
Test method for initial adhesion of pressure sensitive adhesive tape by inclined rolling ball method