How to detect the stickiness of BOPP synthetic label paper?

The viscosity of BOPP synthetic label paper can be detected by various methods, and the following are some commonly used detection methods:

1、 Qualitative testing methods

Observation method:

Stick BOPP synthetic label paper onto a smooth surface and observe whether it can firmly adhere and maintain for a period of time. If the label paper can adhere firmly and is not easily peeled off, it indicates that it has high adhesion.

Texture method:

Touch the surface of BOPP synthetic label paper with your fingers and feel its stickiness. If the surface of the label paper has a certain degree of stickiness and the fingers can feel a certain resistance, it indicates that it has a certain degree of stickiness. But this method is subjective and for reference only.

Peel strength test:

Stick a small piece of BOPP synthetic label paper onto a smooth surface, and then quickly peel off the label paper with force. Determine the stickiness of label paper based on the resistance during peeling. If a certain amount of force is required for peeling and the label paper is not easy to peel off, it indicates that its adhesion is high.

2、 Quantitative testing methods

Tensile testing:

Conduct tensile testing on BOPP synthetic label paper using a tensile testing machine, and indirectly evaluate its viscosity by measuring parameters such as maximum tensile strength and elongation at break. Generally speaking, BOPP synthetic label paper with high viscosity exhibits high tensile strength and low elongation at break when stretched. But this method focuses more on evaluating the overall mechanical properties of the material rather than directly assessing viscosity.

Adhesion test:

Use a viscometer or viscometer to measure the adhesion of BOPP synthetic label paper. This testing method evaluates the viscosity of label paper by measuring its resistance during the cutting process. Commonly used viscometers include rotary viscometers and rolling ball viscometers. This method can provide more accurate viscosity data and is suitable for situations with high requirements for viscosity.

When conducting adhesion testing, the following steps need to be followed:

Prepare samples: Cut the BOPP synthetic label paper into samples according to the required size.

Prepare adhesive: Choose a suitable adhesive, such as glue or tape.

Using a viscometer: Fix the sample on a flat surface and apply a layer of adhesive.

Place the measuring head of the viscometer above the sample and make it in contact with the surface of the sample.

Start the viscometer and pull the measuring head at the set speed until the adhesive separates from the surface of the sample.

Record the adhesion force values displayed by the viscometer, as well as the relevant parameters during the testing process.

Multiple tests can be conducted as needed to obtain more accurate average results.

3、 Testing methods under specific conditions

For specific types of BOPP synthetic label paper such as self-adhesive labels, specific adhesion tests can be conducted according to their application requirements, such as initial adhesion testing, holding adhesion testing, and peel strength testing. These testing methods need to comply with relevant national or industry standards and use specialized testing equipment and instruments for testing.

In summary, various methods can be used to detect the viscosity of BOPP synthetic label paper, including qualitative and quantitative testing methods. When choosing a testing method, it should be based on specific application requirements and testing conditions to ensure the accuracy and reliability of the test results.