How to test the adhesion of copperplate paper adhesive labels?

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The adhesion of copperplate paper adhesive labels can be tested mainly through the following methods:

1、 Water washing simulation experiment

Under specific conditions, attach the copperplate paper adhesive label to the test object and then wash it with water. By observing whether the label is easy to remove and whether there is any residue after removal, the adhesion of the label can be determined to meet the requirements. This method can simulate the washing environment of labels in actual use, and test their washability and adhesive stability.

2、 Initial viscosity test

The initial adhesion test mainly tests the initial adhesion ability of the label. The commonly used testing method is the inclined rolling ball method, which uses an initial viscosity tester for testing. During testing, place the adhesive surface of the label upwards on the inclined surface of the test plate, and then have the standard steel ball roll down from the top of the inclined surface to observe the rolling of the steel ball on the adhesive surface of the label. If the steel ball can be stuck to the label and stop rolling, then the initial adhesion of the label is better. By testing the maximum steel ball model that can adhere, the initial adhesive strength of the label can be quantified.

3、 Holding viscosity test

The adhesion test is mainly used to test the adhesion ability of the label during long-term use. During testing, use a viscosity tester to press the label onto two test plates. One of the test plates is hung vertically on the test stand, and a certain weight is hung at the bottom of the other test plate. The ability of adhesive to resist detachment is characterized by measuring the displacement of the sample after a certain period of time, or the time it takes for the sample to completely detach. This method can simulate the adhesion of labels during long-term use and test their adhesive durability.

4、 Peel strength test

The peel strength test mainly detects the force required for the label to peel off from the adhesive. During testing, use an electronic peel testing machine to bond the label to the adhesive (such as a steel plate), then fold the free end of the sample in half 180 degrees and peel off the adhesive surface from the test plate. Record and calculate the peel strength (unit: kN/m）， It can quantitatively represent the peel strength of the label. This method can simulate the stress situation of the label during the peeling process, and test its adhesive strength and stability.

5、 Precautions

When conducting viscosity testing, it is important to ensure that the testing environment meets standard conditions such as temperature, humidity, etc.

The test sample should be representative and able to truly reflect the adhesive properties of the label.

During the testing process, it is necessary to strictly follow the testing methods and steps to avoid the influence of human factors on the test results.

For different types of labels and application scenarios, appropriate testing methods and indicators can be selected for testing and evaluation.

In summary, the adhesion of copperplate paper adhesive labels can be tested through methods such as water washing simulation experiments, initial adhesion tests, holding adhesion tests, and peel strength tests. These testing methods can comprehensively evaluate the adhesive performance of labels, ensuring their reliability and stability in practical use.