The advantages of hot melt adhesives are primarily manifested in the following features:
1 Quick curing speed, good bonding energy and zakarian01 flexibility.
Hot melt adhesives can cure and bond within a few tenths of a second to some seconds, and have the characteristics of melting when heated, and bonding when cold. This enables packers to use hot melt adhesives to make use of higher-speed production lines, and increase production while reducing defective products, which is handy for steady and automatic high-speed operations, and has a lower cost.
2 The ability of hot melt adhesive is stable
It’s not affected by modifications in temperature and humidity from morning to night within the working environment, which ensures the bonding fastness and eliminates the inherent adhesive peeling problem of packaging machinery.
three Hot melt glue doesn’t include water and any other fluxes
Its solids can be made into blocks, films, strips or pellets, which are straightforward to transport and store. It has an extended service life, eliminates damage and waste, and is simple to use.
four The hot melt adhesive does not include solvents and does not emit dangerous and toxic fumes, will not be simple to burn or explode, is safe, and will not cause secondary air pollution to the environment and endanger human health.
5 The hot melt adhesive forms a glue layer that is proof against water and moisture, and may form a reliable glue even in a moist environment.
6 Hot melt adhesive can be repeatedly melted and bonded
If the hot melt adhesive coated on the adherend cannot be bonded as a consequence of cooling and solidification, it can be reheated for bonding operation, so it is especially suitable for bonding with some particular process requirements components, such because the restoration of some cultural relics.
7 A wide range of bonding objects, both bonding and sealing, no drying process, easy bonding process, and good economic benefits.
8 Good gloss and gloss retention, wonderful shielding.
After all, hot melt adhesives even have some disadvantages, as described beneath:
1 There are limitations in performance, insufficient heat resistance, limited bonding energy, and poor chemical resistance. Modification of the hot-melt adhesive base polymer can improve the heat resistance and strength of the hot-melt adhesive.
2 Coating by hand, the impact shouldn’t be good, and the waste of rubber is troublesome to control. Subsequently, it is important to be geared up with special equipment to melt and apply glue, corresponding to a hot melt gun, which is inconvenient to make use of and restricts its use and promotion.
three Bonding is usually affected by climate and seasons. Usually, the wettability is poor in winter, the curing turns into slower in summer time, and the melting time is shortened when the wind is strong.