Hot Melt Adhesive Raw Materials
Hot melt adhesive are incredibly popular among manufacturers. From their versatility and good cost in use to their water and moisture resistance, it makes sense that Markets and Markets has predicted the hot melt adhesives market to be worth 9.64 billion by 2020.
Let’s take a look at what hot melt adhesives are made of, how they work and some of their benefits.
Hot melt adhesives are thermoplastic, 100% solid and contain no solvents or water. They are comprised of three main elements:
1. Polymers: provide strength and flexibility and give the primary mechanical properties.
2. Resins: provide wetting and adhesion properties.
3. Plasticizer: controls the viscosity and enables it to be easily applied
Generally, hot melt adhesives can bond similar and dissimilar materials. They are applied to an initial material when in a liquid or molten state. After a short open time, the second material is brought into contact. At this point, the adhesives cool down and set quickly, bonding the two together.
Then, what to consider when applying hot melt adhesives? Well, the following factors impact adhesive performance and should be considered when applying.
Temperature: The temperature must be hot enough so that the adhesive viscosity is low enough to adequately wet out the substrates and the materials can be assembled before cooling.
Add-on Level: The add-on level refers to the amount of adhesive used on a given application. This affects the adhesive wet-out to the secondary substrate by modifying the rate of cooling.
Compression: Compression is the amount of pressure applied to laminate the substrates and primarily affects the bond to the secondary substrate.
Open Time: The open time affects the adhesive temperature and wet-out.
Substrates: Substrate texture and chemistry affect adhesive bonding. Highly textured substrates allow for more mechanical adhesion. Highly surface energy substrates promote wet-out.
From automotive and packaging to product assembly and pressure sensitive tapes and labels, hot melt adhesives have a range of applications. In addition to their versatility, hot melt adhesives offer other benefits as well, including long shelf life, elimination of the curing step, and no loss of thickness when solidifying.
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