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Hot melt adhesive is a type of thermoplastic that melts into a solid state by heating and applying temperature. When the adhesive begins to solidify (heat loss) before the material is bonded, cold bonding occurs, which can lead to bonding failure. Usually, it appears to be firmly adhered after bonding, but the bonding strength may not be sufficient. Always heat the glue, quickly bond the substrate to be bonded together and apply pressure.
After bonding, low temperature can also cause “cold cracking”. This situation occurs when the adhesive is exposed to excessively cold temperatures, which may be caused by transportation or storage conditions leading to its failure. When observing the bonding line, the hot melt adhesive may appear to have “broken”. Exposure to extremely cold environments should be minimized as much as possible, or better cold resistant adhesives should be used instead.
Hot melt adhesive is cooled before cold bonding, also known as cold bonding.
The reasons and solutions for the occurrence of cold adhesion phenomenon are as follows:
Hot melt adhesive cold bonding. It is necessary to analyze different reasons and come up with corresponding solutions.
More and more books are using EVA hot melt adhesive for binding process. Almost all of them are used in large, medium, and small processing plants across the country. There will still be an upward trend in the future. This is because using this adhesive results in fast book publishing speed, short cycle time, aesthetically […]
Proper preparation and preheating are required when using hot melt adhesive for books and periodicals to ensure smooth operation. The goal is to achieve a good bonding effect. When using EVA hot melt adhesive, the first step is to master the preparation process such as preheating and temperature control before use. 1. Add glue It […]
Hot melt adhesive is a type of adhesive that is applied in liquid form when heated and solidifies after cooling. A carrier used for adhesives, such as water or solvents, because in reality, heat is the carrier that allows the adhesive to be applied. In addition, most EVA hot melt adhesives do not undergo any […]
Direct answer: The impact is significant. For every 10 ℃ decrease in workshop temperature,hot melt adhesiveThe actual opening time has been reduced by about 30-40%; When the relative humidity exceeds 75%, the moisture content of the paper increases, and the wetting and penetration of the adhesive will deteriorate. The performance of the same batch of […]
