The sticker is currently the most widely used label, but its structure is not simple. A typical sticker consists of five layers, including:
The first layer - surface material, or raw materials, used to record or print graphic information.
The second layer, the primer, or tackifying coating, allows the adhesive and surface materials to bind more closely. The primer also has the function of preventing the penetration of chemical agents, otherwise the chemical agent may permeate from the bottom three layers and smear the surface of the label. In addition, color primers can also be used as a background for transparent surface materials.
The third layer - the label adhesive. The adhesive separates the surface material from the silicone-coated backing sheet before the label surface liner is torn off and the label is applied to the surface of an object.
The fourth layer - silicone coating, used to ensure that the label and liner are easy to separate.
Fifth layer - the liner, the protective label is not contaminated before use, usually made of bleached or primary Kraft paper (occasionally also using a clean polyester material). The backing paper also has a supporting role to ensure that the label does not bend or curl during handling of the label.
Although adhesive labels are widely used and popular, they are not applicable in any environment. For example, the use of heat-sealed labels is more efficient and economical in frozen food packaging and other high-speed operations.
The importance of stickiness testing
Before using different types of adhesive labels, it is very important to test the type of adhesive. Look at this kind of adhesive is a self-adhesive, heat-sealing adhesive or glued paper. Some adhesives react chemically with certain substances. For example, stickers used as labels can contaminate certain special fabrics under certain conditions. Some labels that require short-lasting tack will produce long-lasting tack under exposure conditions. On the other hand, some labels that require long-lasting tack will lose their stickiness on some surfaces.
Problems often occur when using adhesive labels and other labels on the surface of recycled paper. In the process of recycling, there are many different kinds of paper, some of which are contaminated with a coating of silicon or wax, so that the mixing process contaminates the final recycled product. When using labels on the surfaces of these contaminated recycled papers, the adhesive tends to lose its effect. Note: The role of the silicone coating in the sticker is to ensure that the sticker is easily removed from the liner.
Low temperatures can also cause problems. The low temperature reduces the speed of the bond and the label may have peeled off the surface before the adhesive sticks to the surface. If the label is stored improperly - large temperature differences in the environment, humidity fluctuations, or improper stacking - the label will lose its viscosity soon after use.
One of the most important factors for the effective use of adhesive labels is the correct peeling of the sticker from the surface of the liner.
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