Sticker and label glue match
1. Choice of permanent and removable
In terms of the performance of the adhesive, the overall can be divided into two categories: permanent adhesives and removable adhesives. (Permanently used in electronic machinery, such as electronic standards, typical: mobile phone battery standard, removable generally used in food, personal care, etc., such as: wet tissue labels, fruit labels, labels on clothes, etc.)
2, the surface of the sticker
Labels processed with self-adhesive materials may be labeled on the surface of various materials such as glass, metal, cardboard, and plastic. Plastics can be further divided into: polyvinyl chloride, high density polyethylene. Tests have shown that different label surfaces have the greatest impact on performance. (It is best to use glues and materials with the same or similar chemical composition to be pasted with the stickers)
3. Surface structure of the label substrate
Intuitively, a rough label surface requires a more viscous glue.
4, the surface shape of the label substrate
The surface of the label substrate has a flat surface and a curved surface. If the surface of the label has a certain curvature (for example, a surface of a vial having a diameter of less than three centimeters), the surface paper may have a good conformability or a relatively strong viscosity. It is also necessary to use materials with better softness and stretch resistance, such as PVC. The flat surface of the object to be attached is adapted to the wider labeling material.
5, the surface of the label cleaning
Adhesive materials are best suited for label substrates with clean, dry, oil-free and dust-free surfaces. (When labeling, keep the surface of the object to be dry, no oil and no dust, in order to achieve the best labeling effect)
6. Adverse effects of plasticity on the glue
Labeling conditions - Adhesive viscosity needs to be applied under cold, hot, humid or room temperature conditions.
Use environment - Whether the sticker is exposed to temperatures below freezing, whether it is used outdoors, under high temperature, humidity or under UV light, and whether it is close to a higher temperature car engine.
Let's introduce the common self-adhesive glues, which are divided into three types: hot melt adhesives, hydrosols (usually called water gel) and solvent gels.
Three common glue comparisons
| glue | advantage | Disadvantage | Application field |
| Hot melt adhesive | It is a rubber based adhesive. It has strong fluidity, strong viscosity, suitable for low temperature labeling (5 to 10 degrees below zero) and environmentally friendly and non-toxic; the labeling effect is better than hydrosol in the case of trace oil or water on the surface of the sticker. |
A, can not withstand high temperature, can only use B below 70 degrees , the temperature is sensitive during processing, in the winter processing, preservation temperature below 15 degrees Celsius will become hard and brittle C, reproducible poor D, can not be attached PVC material on the sticker |
Do not need too high temperature in the labeling environment, such as food, medicine, supermarket labels, etc. |
| Hydrosol | It is an acrylic adhesive. Strong viscosity, most of the hydrosol is environmentally friendly and non-toxic, and the water-soluble glue is more resistant to hot melt. Most of the hydrosols can withstand temperatures below 90 °C, and some hydrosols can withstand temperatures of about 150 degrees. | Low temperature labeling performance is poor, there is slight water or oil stain on the sticker, and it is difficult for the hydrosol to exert its viscosity because the hydrosol has poor fluidity. | Used in food, medicine, daily chemical products and some industrial products with strict environmental protection requirements |
| Solvent glue | An adhesive that dissolves and coats the adhesive with a solvent as a medium. Strong viscosity, not easy to overflow, high temperature resistance, can adapt to outdoor labeling | Not environmentally friendly, most solvent glues are toxic and expensive. | Used in electronic labels and some labels for high temperature labeling environments |
In addition to the features listed in the table, we must also note that the hot melt adhesive is much stronger than the water gel when it is first applied, but if you try it after 24 hours, you will find The label using the water gel is far more difficult to remove than the hot melt adhesive. This is because the fluidity of the water gel is slow. In the more than 20 hours after labeling, the glue under the label is finally completely and the adherend The reason for the surface adhesion.
