Although many companies know what kind of self-adhesive labels they need, they do not understand label glue. Glue is very important for the adhesion of self-adhesive labels. The following introduction by Lu Xiaoyin can almost meet the selection needs of most customers.
In terms of the performance of adhesives, the glue commonly used in self-adhesive label printing can be generally divided into two categories: permanent adhesives and removable adhesives. (Permanent is generally used in electronic machinery, such as electronic labels, typical: mobile phone battery labels, removable is generally used in food, personal care, etc., such as: wet wipes labels, fruit labels, labels on clothes, etc.)
The glue of self-adhesive labels has become an indispensable material in industrial production and daily life due to its easy use and sticking characteristics, but there are actually many types of glue, and the prices and applications of glues of different properties are different. In order to make a better choice for everyone, today Lu Xiaoyin will introduce the common self-adhesive glues, which are divided into three types: hot melt glue, hydrosol glue (usually called water glue), and oil glue characteristics
Comparison of two common glues
Hot melt adhesive self-adhesive: belongs to rubber-based adhesives. Strong fluidity, strong viscosity, suitable for low-temperature labeling (minus 5 to 10 degrees), environmentally friendly and non-toxic; the labeling effect is better than hydrosol when there is a trace of oil or water on the surface of the object. Disadvantages of glue: A. Not resistant to high temperatures, can only be used below 70 degrees B. Sensitive to temperature during processing, it will become hard and brittle when processed and stored in winter at a temperature below 15 degrees Celsius C. Poor re-stickability D. Cannot be attached to objects made of PVC Application areas: Labeling environments that do not require too high temperatures, such as food, medicine, supermarket labels, etc.
Hydrosol self-adhesive: an acrylic adhesive. Strong viscosity, most hydrosols are environmentally friendly and non-toxic, and water-soluble glues are more temperature-resistant than hot-melt glues. Most hydrosols can withstand temperatures below 90 degrees Celsius, and some hydrosols can withstand high temperatures of around 150 degrees. The low temperature labeling performance is poor. If there are slight water or oil stains on the labeled object, the hydrosol is difficult to exert its viscosity. This is because the fluidity of the hydrosol is poor. It is used on the labels of food, medicine, daily chemical products and some industrial products with strict environmental protection requirements.