Hot Melt Adhesive - Three Application Methods
It is said that the global hot melt Adhesive market is expected to be worth $9.64 billion by 2020. From automotive and packaging to assembly and the tape and label market, these adhesives are versatile and can serve a range of applications in diverse markets.
Let’s take a closer look at the types of hot melt application methods and variables to consider.
Generally, hot melt adhesives can be applied in three main ways:
1. Slot Extrusion: This type of extrusion is used for applications that require a wide bonding area. Typically, this method fits tape and label application needs.
2. Bead Extrusion: Bead extrusion pumps the adhesive through a nozzle and forms a bead-shaped adhesive amount onto a substrate. This type of method works well for rigid packaging applications, which don’t require a wide surface coverage area for case and carton sealing.
The spray application method is similar to bead extrusion, a nozzle is used to push the adhesive out. However, it also uses a stream of air that creates a swirled pattern of the adhesive on a substrate.
This method is beneficial for temperature sensitive substrates, as the air helps cool the adhesive prior reaching the substrate’s surface. Additionally, it is used for applications that need a wide bonding area but don’t require much adhesive, such as in nonwovens or assembly.
The roll coat method is used when bonding large panels together. The hot melt adhesive is metered by the gap between rolls onto the primary substrate. It moves down a conveyor where a second panel is placed atop the first panel, and then nipped together. Typically, this adhesive application method is used for truck and RV applications as well as garage door panels.
The above are the three application methods of hot melt adhesive. Each of them have their special advantages and can be used particularly in some certain areas. Therefore, before applying hot melt adhesive, consider your application in advance, and then choose the most suitable method to apply your work to achieve the best result.
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