Hot melt adhesive is made from polymer materials, and the stability of its performance will change according to the stability degree of molecules. As we all know, hot melt adhesive is relatively sensitive to temperature. Both hot and cold weather have a direct impact on the material molecules, resulting in the situation that hot melt adhesive can stick sometimes while it can't at other times. To solve the problem that hot melt adhesive doesn't stick in cold weather, it's necessary to clearly understand the reasons for this phenomenon first.
When hot melt adhesive is heated, its internal molecules expand. Under the same gluing methods and penetration principles, the volume of hot melt adhesive molecules in contact with the adherends in hot weather is larger than that at room temperature. However, when the temperature drops, the low temperature causes the molecules inside the already solidified glue blocks to contract when cooled. As a result, the molecules of the hot melt adhesive and those of the adherends are no longer closely packed together, and the phenomenon of loss of adhesion is very likely to occur. This is exactly the reason why hot melt adhesive becomes non-sticky in cold weather.
Hot Melt Adhesive Not Sticking
Thermal expansion and contraction are physical properties, and hot melt adhesive is no exception. So how to deal with the phenomenon that it can stick in hot weather but not in cold weather? This involves the performance issues of hot melt adhesive. We can see that the hot melt adhesives on the market are either low-temperature-resistant or high-temperature-resistant. Then, are there any hot melt adhesives that are both high-temperature-resistant and low-temperature-resistant? If there are, wouldn't it just solve the problem that the products bonded well in summer lose their adhesive force and fall off in winter? Currently, there are hot melt adhesives on the market that are both high-temperature-resistant and low-temperature-resistant, but the ranges of low-temperature and high-temperature resistance of such hot melt adhesives are not very wide. For applications with relatively narrow requirements for temperature resistance range, the currently more common solution is to use hot melt adhesive with a summer formula in hot weather and use that with a winter formula in cold weather.
There are many reasons for hot melt adhesive not sticking. As long as the reasons for the non-sticking phenomenon are clearly understood, it will be very easy to solve the problem of loss of adhesion of hot melt adhesive. Hangzhou Banglin Hot Melt Adhesive Manufacturer has rich application experience in hot melt adhesive. Welcome to call the contact information below to communicate and negotiate.