Applications of Hot Melt Polyurethane Technology
hot melt polyurethane technology is widely used in different industrial and manufacturing procedures. It can provide extreme adhesive power in assembling parts and sealing packages. Here are the different applications of hot melt technology:
1. Packaging - In packaging, the adhesive should not be that strong because it will be removed upon getting the product out of the package. You do not want to have the product sealed forever inside the box (or whatever container is used). However, the adhesive should be strong enough to keep the product inside the package in a perfectly safe and dry condition (especially if it is food).
There are specially designed industrial hot melt equipment for packaging. These equipments can be used for carton sealing, bag sealing, case sealing, tamper-proof closures, box making, tray making, etc.
2. Nonwovens - The use of nonwoven fabrics in clothing and other furnishings are widely embraced because of their strength and resilience. The hot melt technology has a part in achieving those properties of nonwoven fabrics.
Nonwovens are fabrics that are not knitted or woven. The fibers used in nonwoven fabrics are bonded with the application of heat and pressure. There are special resins, called binders, which are used in holding the fibers together.
The most common fibers used in making nonwovens are cotton, rayon, polyester, wool, acetate and acrylic.
Some binders used in nonwovens are acrylic, vinyl acrylic, vinyl acetate and styrenated acrylics.
3. Appliance assembly - Hot melt technology is starting to get the attention of appliance manufacturers because of its low cost without the strength getting compromised.
Specialized industrial equipment dispenses molten thermoplastic resins that are used as adhesives in assembling an appliance. The strength of the adhesive will be achieved upon the cooling of the pliable resin. This is a great time saver for manufacturers because it reduces the clamping time.
4. School projects, arts and crafts - This is the most basic application of this technology is the traditional consumer glue gun. It is the simplest adhesive dispenser that is readily available in households and schools.
The traditional adhesive used is the glue stick which may be cleared or colored. There are also novelty glue sticks like glittered sticks and glow-in-the-dark that are made specifically for artworks.
If it is the most basic, why do we have to mention it? For all we know, advanced technology always originates from the traditional practice. The traditional adhesive used (aside from glue stick, there are other thermoplastic resins that are traditionally used) are subjected to limitations. They tend to melt at high temperature and become brittle in low temperature; thus, losing the strength of the bond.
To address the temperature sensitivity of traditional adhesives, advanced adhesives are developed. Companies like Nordson also built high performance hot melt equipment for a better application of these adhesives.
5. Other applications - The use of hot-melt technology covers a wide range of disciplines. This includes jewelry making, medical and dental applications, flower arrangement, hair extension, etc. There are special equipments and adhesives that are dedicated to a particular application.
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