What is the difference between hydrosol and hot-melt adhesive label paper

There are significant differences between the self-adhesive label paper of hydrosol (water glue) and hot melt adhesive in many aspects, and these differences are mainly reflected in the composition, viscosity, temperature resistance, application environment and environmental protection.

1. Composition and nature

Hydrosol self-adhesive label paper: water is used as a dispersing medium, and the adhesive composition is usually acrylic acid or other water-soluble polymers. These labels are environmentally friendly and non-toxic because they do not contain organic solvents.

Hot melt adhesive label paper: the main component is hot melt adhesive, usually composed of EVA resin copolymerized by ethylene and vinyl acetate, and may contain viscosifier, viscosity regulator, antioxidant and other ingredients. Hot melt adhesive is solid at room temperature, becomes liquid after heating, and has plasticity.

Second, viscosity characteristics

Hydrosol self-adhesive label paper: the initial viscosity may be low, but the viscosity gradually increases over time, and the final viscosity is higher. Its viscosity mainly depends on the affinity between the water molecule and the surface of the bonded material. It should be noted that if there is water or oil stains on the surface of the paste, the viscosity of the hydrosol may be affected, and it is easy to drop the mark or tilt the mark.

Hot melt adhesive label paper: high viscosity, especially after heating quickly melt and bond, curing after cooling. The adhesive force of hot melt adhesive is strong, and it can maintain strong adhesion even in harsh environments such as high temperature and humidity, ensuring that the label is effectively attached for a long time.

Three, temperature resistance

Hydrosol self-adhesive label paper: temperature resistance is relatively good, generally can withstand high temperatures below 90 degrees Celsius, and some products can even withstand higher temperatures. This makes the hydrosol self-adhesive label paper perform well in some occasions that need to withstand a certain temperature change.

Hot-melt adhesive label paper: It has poor temperature resistance and is generally used in scenarios below 70 ° C. Because hot melt adhesive is not resistant to high temperature, once it exceeds its tolerance temperature range, the viscosity may decrease or even fail.

4. Application environment and restrictions

Hydrosol self-adhesive label paper: due to environmental protection, non-toxic and strong viscosity, hydrosol self-adhesive label paper is widely used in food, medicine, daily chemical products and other fields. However, labeling performance may be poor in low temperature or humid environments, requiring special attention.

Hot-melt adhesive label paper: it is also suitable for food, medicine and other fields, but due to its temperature resistance, it is not suitable for long-term use in high temperature environment. In addition, the hot melt adhesive can not be affixed to the PVC material, and the readhesion is poor, once affixed, it is difficult to replace or tear.

Five, environmental protection

Both belong to environmentally friendly products, non-toxic, tasteless, solvent-free, pollution-free. However, in the specific application process, attention is still needed to select the right materials and processes to reduce the impact on the environment.

In summary, there are significant differences in the composition, viscosity, temperature resistance, application environment and environmental protection of the self-adhesive label paper of hydrosol and hot melt adhesive. In practical applications, appropriate label paper should be selected according to specific requirements and scenarios to ensure the best pasting effect and use experience.