What are the adhesive testing methods for A4 stickers?

The adhesive testing methods for A4 stickers mainly include the following:

1、 Initial viscosity test

Rolling ball method: This is a commonly used method for testing the initial adhesion of adhesive labels. During testing, a series of standard steel balls with different diameters are used to freely roll down from the top of the inclined surface and observe which diameter of steel ball can stay on the adhesive surface of the sample. The larger the steel ball, the greater the initial adhesion of the sample. The testing environment needs to be controlled at room temperature of 23 ± 2 ℃, relative humidity of 50% ± 10%, and the inclination angle of the test plate of the tester should be 30 °.

2、 Holding viscosity test

Holding viscosity tester testing method: Prepare testing tools such as steel plates, hooks, weights, etc. Stick the adhesive label on the steel plate, hang a weight of the specified weight, and record how long it takes for the steel plate to fall off. The longer the falling time, the better the adhesive strength of the sticker. The testing environment is usually at a temperature of 23 ± 2 ℃ and a humidity of 65 ± 5%.

3、 Peel strength test

180 ° peel test: This is a commonly used method for determining the peel strength between adhesive and substrate. During testing, lay the adhesive sample flat on the substrate and apply a certain force through a universal testing machine or peel force tester to peel it off, measuring the required force. The testing unit is usually kN/m, and the testing environment needs to be controlled at room temperature of 23 ± 2 ℃ and relative humidity of 65 ± 5%.

4、 Viscosity test

Rotation or tilt testing method: Place the adhesive sample into the initial adhesion tester or holding adhesion tester, and measure its viscosity by rotation or tilt. This method can intuitively reflect the viscosity characteristics of stickers.

5、 Other testing methods

Tensile testing method: Conduct tensile testing using a tensile testing machine and an adhesive strength tester, and evaluate the adhesive strength of the adhesive by measuring the required force. This method is suitable for situations where more accurate evaluation of adhesive strength is required.

Environmental adaptability test: Expose the adhesive sample to different temperature and humidity conditions and observe its adhesion. By comparing the test results, the adhesive ability of stickers can be evaluated in different environments. This method helps to understand the performance of stickers in practical applications.

In summary, there are various methods for testing the stickiness of A4 stickers, and the specific choice of method depends on the testing purpose and actual needs. When conducting testing, relevant standards and specifications should be strictly followed to ensure the accuracy and reliability of the test results.