As one of the most experienced hot melt adhesive manufacturers in the industry, Henkel has an excellent range of products to choose from. Over the years, we have developed a number of different types of hot melt adhesives that help businesses improve efficiency on the production line. This allows us to meet the demands of a number of different industries and maintain our position as one of the most trusted hot melt adhesives suppliers.
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From bonding the spines of books, to sealing packaging, to manufacturing tape, hot melt adhesives have a wide range of uses. Different types of hot melt adhesives have different properties. Available chemistry platforms for hot melt adhesive materials include:
Hot melt adhesives are formulated from a variety of thermoplastic polymers. Each polymer has its own properties and benefits. Thermoplastic polymers are solid at room temperature and become liquid when heated. Most of the thermoplastic polymers used to make hot melt adhesives become molten at relatively low temperatures (above 80˚C). This helps to protect heat sensitive substrates.
Henkel pioneered a line of low application temperature adhesives known as TECHNOMELT® COOL. Initially designed to work with heat sensitive applications, low temperature hot melt adhesives offer the added benefit of improving worker safety with reduced burn risks to employees on production lines. The lower operating temperatures also reduce energy consumption and offer sustainability benefits at manufacturing sites. Many manufacturers adopted TECHNOMELT® COOL as a preferred general-purpose hot melt adhesive solution for applications requiring standard heat resistance.
As factory footprints shrink in size and line speeds increase to keep up with growth and equipment advancements, hot melt adhesives continue to adapt. Henkel meets these new requirements with TECHNOMELT® SUPRA, a range of high-performance adhesives. When metallocene catalyzed polymers were introduced, Henkel further enhanced the TECHNOMELT® SUPRA line with adhesives that increase stability, achieve longer pot lives, deliver less downtime and char, and result in less machine maintenance. TECHNOMELT® SUPRA products are more robust than previous technologies and can withstand greater temperature extremes resulting in fewer pop opens. Additionally, they support faster set speeds and longer open times, making them more suitable for more complex operations with faster equipment.
Henkel’s TECHNOMELT SUPRA PRO® offers different thermoplastic polymers specially tailored for food packaging applications. Within this product line, there are several high-performance hot melt adhesives available for different food packaging substrates all while supporting increased production efficiency.
Polyamide-based hot melt adhesives offer excellent resistance to heat, oil, grease, plasticizers, and solvents. They are also very strong and flexible. These qualities make them a good choice for difficult to bond, low energy substrates. Polyamide-based hot melt adhesives are generally used in electronics, filtration, automotive, and aerospace applications due to their high heat and chemical resistance properties.
TECHNOMELT® PA hot melt adhesives offer beneficial characteristic properties necessary to excel in demanding performance environments. They have higher thermal stability and good chemical resistance to common solvents, plasticizers, and oils. TECHNOMELT® PA adhesives have higher creep resistance under load and better heat resistance with thermally stability up to 160°C.
TECHNOMELT® PA provides protection for modern electronic components, printed circuit boards (PCBs), and lighting applications. The product family delivers electrical insulation, as well as temperature, vibration and solvent resistance for many applications. These products protect electronics from the harshest environmental conditions, including high humidity, long-term UV exposure and extreme thermal cycling. TECHNOMELT® PA also supports low pressure molding, which is a faster and more efficient process than conventional potting. The products range includes one-part material – no mixing or curing – and reduces material consumption through streamlined, multi-level, contour-exact encapsulation. This is a sustainable option with its green chemistry and reusable formulation.
Polyamide-based hot melt adhesives have high cohesive strength with strong inter-chain hydrogen bonds, which is the reason for their relative high strength and chemical resistance properties. TECHNOMELT® PA formulations offer a flexible open time from a few seconds up to about a minute and provide excellent adhesion to a wide variety of substrates including metal, paper, wood, and many plastics such as PVC and surface-treated polypropylene and polyethylene. Polyamide hot melt adhesives are also used for bonding textile fabrics because they have good resistance to dry cleaning fluids. Other important applications include furniture assembly, shoe making, automotive assembly, and gas/oil filter bonding.
Polyurethane-based hot melt adhesives are one of the oldest hot melt technologies around. They provide excellent thermal stability and work especially well for case, carton, and tray sealing applications. Henkel’s PUR hot melt adhesives are flexible and withstand a range of thermal settings. They are particularly suitable for automotive, building materials, and bookbinding due to their strong adhesive bonding capabilities.
TECHNOMELT® PUR adhesives have greater bond strength. PUR adhesives polymerize when in contact with the moisture in the air enabling the formation of stronger bonds after the curing process is complete. Additionally, PUR hot melt adhesives have a low volatile organic compound (VOC) content compared to traditional hot melt materials. Lower VOCs also reduce environmental impacts.
Some PUR hot melt adhesives have faster set times and a lower need for having drying and ventilation equipment. Most PUR adhesives also require 24 hours to completely cure. The adhesive strength continues to increase from reactions with the moisture in the air.
Henkel is at the forefront of developing bio-based hot melt adhesive technology specifically suited for sustainability and circular economy uses. This is in response to increasing industry interest in these types of formulations to help reduce dependency on petroleum-based raw materials while the reducing carbon footprint of manufacturing operations. As a leading developer of these bio-based hot melt adhesive chemistries, Henkel is looking improve the way companies better their sustainable packaging initiatives.
Learn about the hot melt adhesive products we offer and ask industry specific questions about this type of adhesive by contacting a member of our team or using the contact form below.
EASYFLOW® is a patented, adhesive in small, non-sticky mini chub form. This unique form enables auto feeding of TECHNOMELT® DM adhesives into hot melt tanks, improving production line efficiency while manufacturing disposable hygiene products and minimizing downtime and material handling. Mini in size, EASYFLOW® is highly effective when it comes to performance and efficiency. EASYFLOW® brings three main benefits for consumer goods manufacturers to keep productions lines moving while reducing downtime:
Produced with a protective coating, the adhesive is delivered in small, light, non-sticky, and easy to handle mini chubs. The protective coating does not affect the application or end-performance of the adhesive. The coating is 100% compatible with the adhesive and it will not separate in the hot melt tanks. This unique product form helps establish a robust production line to support improved efficiency, resolve application issues, and make it easier for line operators.
For hot melt bead or line applications, the nozzle fires a specific amount of adhesive and then is cut off before firing again. This method is often used when an adhesive is needed in a specific spot and can be compressed quickly. Similar to spray applications, as soon as the adhesive is dispensed, it begins to cool. In utilizing this application, it is important to understand the set speed for the application to avoid bonding issues.
When it comes to ensuring exceptional bonding, hot melt adhesives are an absolute game-changer. From industrial applications to DIY projects, these versatile adhesives offer unmatched strength and reliability. In this comprehensive guide, we will delve into the world of hot melt adhesives, exploring their unique properties, applications, and benefits.
Hot melt adhesives offer a wide range of advantages that make them a preferred choice for bonding in various industries. First and foremost, their quick setting time is a major advantage, allowing for fast assembly and increased productivity. Unlike other adhesives that require hours to cure, hot melt adhesives solidify within seconds, reducing production time and enabling faster project completion.
Furthermore, hot melt adhesives provide excellent bonding strength. They form strong and durable bonds on a variety of materials, including wood, plastics, fabrics, and metals. The adhesive's ability to adhere to different surfaces ensures reliable and long-lasting bonds, even in demanding applications.
In addition to their quick setting time and superior bonding strength, hot melt adhesives have excellent temperature resistance. They can withstand extreme temperatures without losing their adhesive properties, making them suitable for applications that require resistance to heat or cold. This versatility allows hot melt adhesives to be used in a wide range of industries, from automotive manufacturing to electronics.
Hot melt adhesives find extensive use in numerous industries and applications. One of the most common applications is in the packaging industry, where hot melt adhesives are used for sealing cartons, boxes, and envelopes. The quick setting time of hot melt adhesives ensures efficient packaging processes, reducing downtime and increasing productivity.
Another significant application of hot melt adhesives is in the woodworking industry. These adhesives provide a strong bond for joining wood pieces, making them ideal for furniture manufacturing, cabinetry, and woodworking projects. Hot melt adhesives offer a reliable alternative to traditional methods such as nails and screws, providing a seamless and aesthetically pleasing finish.
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Hot melt adhesives are also widely used in the automotive industry for various bonding applications. From interior trim assembly to wire harnessing, hot melt adhesives provide a durable and efficient solution. The adhesive's ability to bond different materials together, such as plastics, metals, and fabrics, makes it a versatile choice for automotive manufacturers.
Understanding how hot melt adhesives work is essential for achieving optimal bonding results. Hot melt adhesives are solid at room temperature and require heating to become molten. They are typically supplied in the form of solid sticks, pellets, or granules that are melted using a hot melt glue gun or a specialized hot melt adhesive system.
Once molten, the adhesive is applied to the surfaces that need to be bonded. As the adhesive cools, it solidifies and forms a strong bond between the two surfaces. The heat activates the adhesive, allowing it to penetrate the substrate and create a secure bond.
The unique properties of hot melt adhesives, such as their low viscosity when molten and high viscosity when solid, contribute to their excellent bonding capabilities. The low viscosity allows the adhesive to flow easily into the gaps and irregularities of the surfaces, ensuring maximum contact and adhesive coverage. As the adhesive solidifies, its high viscosity prevents it from flowing out of the bond line, providing a strong and durable bond.
Selecting the right hot melt adhesive is crucial for achieving optimal bonding results. There are several factors to consider when choosing a hot melt adhesive for your specific project.
First, consider the materials that need to be bonded. Different materials require different types of adhesives to achieve a strong and durable bond. For example, bonding plastics may require a different adhesive formulation than bonding wood or metal. Consult with adhesive manufacturers or suppliers to determine the most suitable adhesive for your specific materials.
Next, consider the required bond strength and flexibility. Some applications may require a flexible bond that can withstand movement or vibrations, while others may require a rigid bond for structural support. The adhesive formulation and its specific properties, such as tensile strength and elongation, play a crucial role in determining the bond's strength and flexibility.
Another important factor to consider is the application temperature. Some hot melt adhesives have a lower melting point, making them suitable for low-temperature applications, while others have a higher melting point for high-temperature applications. Ensure that the adhesive can withstand the operating conditions of your project to prevent bond failure.
Proper surface preparation is essential for achieving strong and durable bonds with hot melt adhesives. Before applying the adhesive, ensure that the surfaces are clean, dry, and free from any contaminants such as dust, grease, or oil. Any residues on the surfaces can hinder the adhesive's ability to bond effectively.
To clean the surfaces, use a mild detergent or solvent that is compatible with the materials being bonded. Gently scrub the surfaces with a clean cloth or brush to remove any dirt or debris. After cleaning, allow the surfaces to dry completely before applying the hot melt adhesive.
In addition to cleanliness, surface roughness can also enhance adhesive bonding. Roughening the surfaces using sandpaper or other abrasive materials can increase the adhesive's grip and improve bond strength. However, be cautious not to damage the materials or create excessive roughness that could compromise the overall integrity of the bond.
There are various techniques for applying hot melt adhesives, depending on the specific project requirements. The most common method is using a hot melt glue gun, which allows for precise and controlled application of the adhesive. Simply load the adhesive into the gun, heat it until molten, and apply it to the surfaces that need to be bonded.
For larger or automated applications, hot melt adhesive systems, such as hot melt glue pots or hot melt adhesive dispensing machines, offer more efficient and consistent adhesive application. These systems can be integrated into production lines, ensuring accurate and uniform adhesive deposition.
When applying hot melt adhesives, it's important to consider the adhesive's open time or working time. The open time refers to the period during which the adhesive remains molten and workable after application. It is crucial to work efficiently within this timeframe to ensure proper bonding before the adhesive solidifies.
While hot melt adhesives are generally reliable, certain issues may arise during bonding. One common issue is poor adhesion, which can be caused by insufficient surface preparation, improper adhesive selection, or inadequate adhesive coverage. Ensure that the surfaces are properly cleaned and roughened, and choose an adhesive that is suitable for the materials being bonded.
Another issue is adhesive stringing, where the adhesive forms long, thin strands as it is applied or pulled away. This can be caused by excessive adhesive temperature or improper application technique. Adjusting the adhesive temperature and applying the adhesive smoothly can help minimize stringing.
In some cases, bond failure may occur due to inadequate bond strength or improper adhesive application. If this happens, it is important to assess the root cause of the failure and make the necessary adjustments in surface preparation, adhesive selection, or application technique.
Working with hot melt adhesives requires appropriate safety precautions to prevent accidents and injuries. Follow these safety guidelines to ensure a safe working environment:
• Always wear protective gloves and safety glasses when handling hot melt adhesives to avoid burns or eye injuries.
• Use caution when working with hot melt glue guns or adhesive systems, as they can reach high temperatures. Avoid touching hot surfaces and keep them away from flammable materials.
• Ensure adequate ventilation in the workspace to prevent the inhalation of adhesive fumes. If working in a confined space, use a fume extractor or work in a well-ventilated area.
• Store hot melt adhesives in a cool, dry place away from direct sunlight or heat sources to prevent premature melting or degradation.
• Dispose of used adhesive sticks or pellets properly, following local regulations and guidelines.
Hot melt adhesives have revolutionized the way we bond materials, offering quick, efficient, and durable results. Their unique properties, applications, and benefits make them an indispensable tool for professionals and DIY enthusiasts alike. By understanding the advantages of hot melt adhesives, choosing the right adhesive for your project, and mastering proper application techniques, you can unleash the true power of these remarkable bonding solutions. Now, armed with this ultimate guide, you are ready to tackle any bonding project and achieve exceptional results.
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