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Hot melt adhesive is a non-toxic, odorless, and environmentally friendly plastic adhesive that changes with temperature. Hot melt adhesive can produce multiple colors. The prices of hot melt adhesive in the market are also uneven. So how to distinguish the quality of hot melt adhesive?
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
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