As the hot melt adhesive wider and wider apllication used in many industries, some factories will meet many operation problems during the production. Today we will solve a problem why in the hot melt adhesive not sticky?
There are many reasons why hot melt adhesives are not sticky. It depends on what factors affect their performance.
The most common reason is the low temperature.
Why does Hot Melt Adhesive need to work at a high temperature?
Hot temperature can make the internal molecules of the glue expand after being heated.
Based on the same sizing method and penetration principle, the hot melt adhesive has better adhesion on the surface of the material. This is because after the surface of the adherend receives a certain amount of glue, the glue is quickly cooled to a solid, but the molecules still have a certain heat due to the influence of temperature, resulting in a larger molecular volume than normal temperature.
When the adherend is adapted to the adhesion of the hot melt adhesive of a large-sized molecular structure, the adhesive layer is not detached as long as the state of both the adhesives is maintained.
Why does Hot Melt Adhesive doesn’t work at a low temperature?
When the temperature drops, the low temperature causes the molecules inside the solidified rubber block to shrink and shrink, and the molecules of the hot melt adhesive and the molecules of the adherend become no longer tight, which causes unstable conditions in the bonded state.
In such an unstable adhesive state, if the glue does not form as much penetration as possible with the adherend during the previous gluing process, the low temperature is highly likely to cause the bond to collapse. When the weather is cold, it is the reason why the hot melt adhesive becomes non-sticky.
In this case, how to improve the adhesion effect?
1. The material can be preheated.
our glue machine needs to be preheated for 40 mins, the motor can be turned on after the hot melt adhesive in the barrel is fully melted.
2.By baking or infrared heating.
This method can be used if the glue that has been sprayed cools to a solid state.
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