What are the standards for judging the quality of hot melt adhesive for books?

1. The color requirements for book hot melt adhesive also vary

If there is no color requirement for the adhesive book, it is recommended to use light yellow particle hot melt adhesive. Generally speaking, yellow hot melt adhesive has better adhesion than other colors of hot melt adhesive.

2. Working hours of hot melt adhesive

Fast operation is a characteristic of EVA hot melt adhesive, and the running time of EVA hot melt adhesive is generally around 15 seconds.

The production mode is widely applied to assembly lines, and the running time of hot melt adhesive will become shorter and shorter, such as cardboard packaging, pearl cotton bonding, etc. The running time of hot melt adhesive is about 5 seconds

III. Temperature Resistance of Hot Melt Adhesive

EVA hot melt adhesive is temperature sensitive. When the temperature is heated to a certain degree, the hot melt adhesive begins to soften. When the temperature is below a certain level, the hot melt adhesive will become brittle. Therefore, when choosing hot melt adhesive, it is necessary to consider the temperature changes in the product environment.

Fourth, Surface Treatment of Hot Melt Adhesive

The surface treatment of hot melt adhesive is not as strict as other adhesives, but the dust on the surface of the adhesive should also be cleaned in a timely manner, so that EVA hot melt adhesive can have a better bonding effect.

Fifth, the viscosity of book hot melt adhesive is divided into early viscosity and late viscosity

Hot melt adhesive can only be stable when its early viscosity is consistent with its later viscosity. Hot melt adhesive should ensure its antioxidant, halogen resistant, acid-base, and plasticizing properties during the production process. The viscosity of hot melt adhesive depends on the material to be connected. Therefore, different hot melt adhesives should be selected according to the products made of different materials.

Sixth, the principle and advantages of hot melt adhesive bonding

Why does hot glue stick to objects? That’s because hot melt is a polymer, taking our common hot melt adhesive as an example. Eva  Hot melt adhesive is a polymer of vinyl acetate.

When applied to the back of a book, hot melt adhesive will penetrate and complete the bonding process during use, which is the principle of thermosetting.

7. Advantages of Hot Melt Adhesive for Books

1、 It has the advantages of fast bonding speed, good continuity, fast automation speed, and low cost.

2、 No solvent pollution, environmentally friendly, non-toxic, and non flammable.

3、 No need for drying process, simple bonding process.

4、 The product itself is sturdy, easy to package, transport, and store, with a small footprint and convenient storage.

5、 Good adhesion and flexibility.

6、 Hot melt adhesive sticks can be used to bond and seal various objects.

7、 Good gloss, good light retention, and good shading.