What are the quality testing standards in the self-adhesive copperplate label paper industry?

The quality testing standards in the self-adhesive copper label paper industry involve many aspects to ensure that the quality and performance of the label paper meet the requirements of use. The following are some of the main quality inspection criteria:

First, appearance quality

Surface smoothness: The surface of the self-adhesive label paper should be flat, without obvious wrinkles, damage, stains, scratches and other defects.

Color uniformity: the color should be uniform, no obvious color difference, color spots and other phenomena.

Second, physical properties

Thickness: The thickness of the self-adhesive label paper should meet the relevant national standards, generally between 0.05mm and 0.25mm. This index has an important impact on the adhesive effect and durability of the label.

Tear strength: under specified conditions, the tear strength of the paper should meet the standard to ensure that the label is not easy to be torn during use.

Elongation: For some special kinds of self-adhesive label paper, it may be necessary to consider its elongation.

Third, viscous properties

Initial viscosity: represents the bonding speed of the material, which is a key indicator of whether the self-adhesive label can be quickly and firmly pasted on the surface of the object during the labeling process. It can be tested by the initial viscosity tester.

Stickiness: represents the length of time that the self-adhesive label can maintain stickiness, and is an important indicator to measure the durability of the label. It can be tested using a stickiness tester.

Peeling strength (peeling force) : that is, the difficulty of peeling off after the sticker label is affixed, which is the most important embodiment of the stickiness of the sticker products. Generally, electronic tensile testing machine or electronic stripping testing machine is used for testing.

Fourth, functional performance

Heat resistance: Evaluate the stability of the label at high temperatures to ensure that it does not deform or degel under specific application conditions.

Washable: For labels that need to touch water, such as food packaging labels, test their stickiness after washing.

Cold resistance: In a low temperature environment, the label should be able to maintain its viscosity and physical properties, without embrittlement or falling off.

Water resistance, weather resistance, flame retardant: These properties are evaluated according to the specific application scenario to ensure that the label can maintain stable performance under a variety of natural conditions.

Fifth, printing adaptability

Printing effect: Evaluate the printing effect of the label paper, including color reproduction, clarity, etc., to ensure that the required information can be clearly and stably printed.

Print durability: Evaluate the durability and wear resistance of printed information by simulating the actual use environment (such as friction, light, etc.).

Sixth, environmental performance

Detection of harmful substances: Through chemical analysis to detect the content of harmful substances in the label paper, such as heavy metals, plasticizers, etc., to ensure that it meets environmental standards.

Biodegradability testing: Assessing the biodegradability of label paper materials to comply with environmental trends and regulatory requirements.

In summary, the quality testing standards in the self-adhesive copperplate label paper industry cover many aspects such as appearance quality, physical properties, adhesive properties, functional properties, printing adaptability and environmental performance. The formulation and implementation of these standards is of great significance to ensure the quality and performance of self-adhesive label paper.