Hot melt glue is both durable and easy when you want to fasten skirting boards and cables, repair china or glue back a shoe sole that has come loose. It is also suitable for decorations and crafts. Hot melt glue has several benefits over air-drying glue and contact adhesives, as it offers quick adhesion, while also letting you make some adjustments afterwards. You can choose between different universal glues that are suitable for several types of material. But there are also special adhesives for textiles, wood, ceramics and plastic, for example, which offer better adhesive strength for specific materials.
Advantages of Hot-melt Adhesive
Increased production value
Optimised to enhance manufacturing productivity, hot melts are thermally stable, ensuring minimal charring and reduced nozzle blockages – helping to boost production uptime. They are easy to set up, provide consistent application, reduce material waste, and are ideally suited for high volume production.
Enhanced product performance
Derived from specially engineered polymers, hot melts provide an almost unlimited range of customisation options, making them suitable for a diverse set of industries and applications. Because they resist extreme temperature fluctuations – during shipping or storage, for example – they can be used in challenging environments, and yet still provide durable and consistent bonding.
Overall cost effectiveness
Clean running hot melts minimise the build-up of char or gel and do not, therefore, lead to clogged hoses and nozzles which, in turn, means less stoppages, less cleaning, and ultimately the avoidance of costs associated with buying new applicator equipment.
Safety and health
Elimination of volatile organic compounds (vocs) is a key safety benefit of using 100% solid hot-melt adhesives. Unlike solvent-based glues hmas do not produce harmful vapours that can potentially irritate skin, eyes and lungs - and do not, therefore, necessitate investment in expensive extractor equipment. Disposal of hmas has few or no environmental precautions.
Sustainability
Hot melts can be formulated using a high percentage of raw materials from plants and other forestry materials – most often plant resins or rubbers – which helps businesses to reduce their carbon footprint. Hmas can also be customised for environmentally friendly applications: Alkali washable labelling adhesives, vegan-friendly glues, or adhesives for pallet stabilisation, being recent examples.
Versatility
Operating successfully on slow and fast machines, and during all seasons, hot-melt adhesives are easy to store, handle and are suitable for a variety of applications, with one hma often suitable for several jobs – helping to reduce inventory.
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Why Choose Us
Stable quality
Our edge banding tape products are backed by years of experience and a commitment to excellence.
Long warranty
We are confident in the quality of our products and are willing to provide you with long-term technical service support.
One-stop services
We have 30+ staff in the operation team, elites are gathered to provide one-stop services in a diversified model.
Oem and odm service
We offer customizable options to meet your specific needs and requirements.
Ethylene vinyl acetate (eva) adhesives
Ethylene vinyl acetate (eva) is a polymer base that is used in the standard packaging of industrial hot melt adhesives. Eva produces high-performing and very competitive packaging hot melt additives. Ethylene vinyl acetate is considered the main option for many applications because it offers one of the greatest performance ranges across all current applications available. Ethylene vinyl acetate can work in both traditional application temperature and low application temperature hot melt adhesives.
Polyethylene adhesives
Polyethylene is a polymer base that works well for tray sealing and carton applications. These adhesives have a very low odor and are light-colored and easily released from metal surfaces for easy cleanup. Polyethylene is not ideal for bonding substrates and is therefore suitable to be used in traditional application temperatures.
Metallocene adhesives
Metallocene polymers existed decades ago. They were combined with other components to provide great stability to hot melt products. They gave storage temperature strength under both hot and cold conditions. They became the fastest-growing polymer base. The metallocene minimized the breakdown from heat exposure and reduced char while expanding the cold and heat bond performance. Some of the offerings available today have metallocene in the adhesives; however, many variants with different stabilities, price points, and bond performance are not the same as in the original products.
Apao (amorphous poly alpha olefins) adhesives
Amorphous poly alpha olefins (apao) are used mostly where there is a long working time or where there is a need for adhesion to plastics. These types of adhesives offer a tacky, soft, and very flexible texture. This makes them a very good choice for assembling products, including adding foam protection to corrugated packaging and bonding corrugated plastic containers.
Polyamides adhesives
Polyamides adhesives are excellent where there is a need for high-temperature resistance. They are also useful in scenarios that need quick assembly strength and solvent and oil resistance. Polyamides are considered an excellent choice for wood, filter, and other applications requiring high performance. Polyamides require extreme temperature applications of about 400 °f (204 °c). However, they do not show much stability when brought to heat, as do other adhesive types.
How Hot Melt Adhesives are Manufactured
Hot melt adhesives are thermoplastic plastics; they become malleable or plastic upon heating and harden upon cooling. Hot melt adhesives do not contain any form of liquid. The raw materials required for their formation are resins, polymers, plasticizers, waxes, and antioxidants. Once these are in place, the hot melt adhesive hardens itself into the end product, ready for delivery or use in many industries. Polyurethane, metallocene, EVA hot melt, and polyethylene are common hot melt adhesives.
Hot melts are heated until they become liquid. The liquid is then brought to the initial surface of the product by spraying, rolling, or extruding the prescribed amount. Afterward, it is exposed for a short time to reach the wetness and optimal temperature for binding with the initial surface. The two surfaces are then brought together. In some cases, the surfaces must be compressed together to promote strong and optimal bonding.
Food packaging
One of the primary reasons hot melt glue sticks are so popular among food packaging applications—for example, sealing the box tops on your favorite brand of crackers or cereal—is because they're free of volatile organic compounds (vocs), which can create a foul odor and can compromise the quality of foods. A popular choice in agricultural packaging, hot melt adhesive does well in hot climates and are able to withstand extreme temperatures. There are also special freezer-grade hot melts for use in carton-closing freezer foods.
General consumer packaging
In addition to food-grade packaging adhesives, hot melts are also implemented in a wide range of other packaging uses, from toys and home goods to medical equipment. Hot melt glue sticks provide a high-strength bond between papers, cardboards, plastics and other materials, making them a good choice for a wide range of packaging containers.
Carton-sealing
One of the most popular applications for industrial hot melts is carton-sealing. The packaging industry relies on hot melts in order to effectively seal boxes and cartons and in the use of pallet sealing and stabilization.
That's because hot melt adhesives are able to bond a wide range of shapes, from small detailed cartons to heavy-duty pallets and cases. It also offers the ability to perform well in various temperatures, making it great for shipping and storage.
Creating envelopes, bags and more
The manufacture of envelopes, bags and corrugated cardboard heavily relies on hot melt glue guns and sticks. These adhesives provide a strong hold on paper, cardboard and other materials, in order to effectively create containers using only the materials themselves and the adhesive. Whether applied via an industrial hot melt dispensing system or manually with a hot melt glue gun, these adhesives are flexible yet strong, making them a good choice for such applications.
Printing and publishing
Often times, books and magazines are bound together using hot melt adhesives in order to create a flexible yet secure bond. Hot melt glue is commonly implemented in bookbinding and print finishing because of its fast-drying yet flexible appeal.
Packaging labels
Again, because hot melt glue sticks are free of vocs, they're a high-quality option for adhering labels to food and beverage products. However, they are also commonly used in applying labels to non-food items, because they provide an adequate hold on paper, plastic and other labeling materials. They are regularly implanted in automatic labeling and product assembly applications.
Textile manufacturing
You may not think of glue as a desirable fastener in textile applications, but that's not so! In fact, hot melt glue sticks are commonly used in both the creation and finishing of synthetic fabrics. They are also regularly used in polymer processing and textile converting in cars, carpeting, home furnishing and other textile-based manufacturing applications.
Disposable diaper manufacturing
Hot melts are used in a wide variety of disposable hygiene and nonwoven product applications. Whether in the manufacture of baby diapers, feminine care products or adult incontinence products, hot melt adhesives are often an integral part of the process.
Cigarette manufacturing
Cold glues and hot melt adhesives are commonly used as the holding substrate implementing in cigarette manufacturing. The cigarette sticks require a long-lasting, safe-to-burn adhesive in order to seal in the tobacco. They are also used in cigarette carton and box manufacturing.
Electronics manufacturing
Many manufacturers implement the use of hot melt adhesives in the manufacture, sealing and labeling of electronics. Because of their flexible makeup and ability to perform well in many temperatures, these adhesives are commonly used in order to affix parts and wires or as an agent for securing, insulating or protecting the electronics' components.
Material of Hot-melt Adhesive
Polymers
Seen as the backbone of the formulation, polymers provide the strength and flexibility that is essential to the performance of glue. Different types of polymers are often used, typically these include ethylene vinyl acetate (eva), thermoplastic rubber, metallocene (mpo) and amorphous poly alpha olefin (apao). Evas, known for their versatility and compatibility to many types of waxes and oils, and metallocenes, ideal for advanced bonding where improved precision, mileage and temperature performance is required, are the most commonly used in modern hot melts.
Resins
Imparting tack is the main function of resins, allowing the adhesive to form the initial bond between substrates, due to the resin having a softening point above room temperature. Tackifying resins also influence many important characteristics of glue: Its stability, colour, odour, and heat resistance are all affected by the amount, type and compatibility of resin used in the formula.
Plasticisers
Acting as a second base polymer, plasticisers can be added to formulations to compensate for base resins that are too hard, providing the adhesive with greater flexibility and workability. Ultimately, this improves wetting and reduces the melt viscosity of the glue.
Waxes/oils
Paraffin, micro & synthetics are common types of waxes and oils that are used as diluents within formulations. They help to control the open time (amount of time it takes to form a bond) and setting speed (how quickly a bond of acceptable strength forms) of adhesives; characteristics which should be tailored to the exact requirements of production. Waxes and oils also influence heat resistance and decrease viscosity.
Antioxidants
Small amounts of antioxidants are added to formulations to support thermal stability, to protect hot melts from degradation during their shelf life and application, which can occur if glues are kept at elevated temperatures for too long. Antioxidants do not influence the physical or adhesive properties of hot melts.
Other additives
Other additives, such as fillers, uv, pigments, dyes, and stabilisers, can be added to formulations to fine-tune certain properties, providing stability against exposure to light, in the case of uvs, or to alter viscosity, open time, and set time, as in the case with fillers.
As with any adhesive technology, some best practices will ensure you get the most out of your hot melts.
Ensure your hot melt stick or slug is clean and dry before inserting it into your applicator
Moisture can not only potentially damage the internal components but also affect the adhesive qualities.
Ensure the hot melt isn't misshapen
This can cause blockages in the applicator, leading to adhesive meltback.
Don't leave glue guns on and idle for extended periods
Despite not being in use, the internal heating system will continue to melt adhesive currently in the glue chamber. This can lead to nozzle leakage or adhesive meltback.
Do not exceed recommended application temperatures
Running adhesives above recommended temperatures can cause burning or charring, as well as changing properties such as viscosity and open time.
Use the correct amount of adhesive
Don't be tempted to over-apply adhesive. Not only will larger amounts of adhesive increase open time, but it may negatively affect the substrate you are attempting to bond (saturating a very porous substrate for example).
How to Choose a Hot-melt Adhesive
Material compatibility
One of the primary factors to consider when choosing a hot melt adhesive is material compatibility. Not all hot melt adhesives are compatible with every material. Some adhesives work well with a wide range of materials, while others may be specifically formulated for certain substrates. You will need to consider the porosity, surface energy, and chemical composition of the materials involved. For example, ethylene vinyl acetate (eva) is a versatile adhesive, frequently used in packaging, that can bond a wide range of substrates. On the other hand, hmpur and polyester hot melts are particularly effective on low energy substrates such as plastics.
Resistance to environmental conditions
Different applications require adhesives that can withstand specific temperature ranges and environmental conditions. For instance, in aerospace and automotive applications, where bonded parts will be exposed to elevated temperatures and/or extreme temperature swings, it's crucial to select an adhesive with high temperature resistance, such as polyamide hot melts. Another example are polyolefin hot melts, a type of adhesive that is widely employed in electronics to seal components from moisture and liquids.
Bonding strength
The bonding strength of a hot melt adhesive is another critical consideration. Depending on the materials being bonded and the stress the joint will endure, you'll need an adhesive with an appropriate level of bonding strength. For heavy-duty applications like automotive manufacturing, where the adhesive must withstand vibrations and extreme forces, opting for a high-strength hot melt adhesive is imperative. Conversely, lighter applications like bookbinding may benefit from a more flexible adhesive that provides a strong bond without unnecessary rigidity, such as polyurethane hot melts.
Bonding speed
Different applications have varying requirements when it comes to adhesive bonding speed. In high-volume manufacturing processes like furniture manufacturing, a quick-setting adhesive is essential to maintain efficiency and productivity. On the other hand, applications that allow for longer curing times may benefit from adhesives that provide a more extended open time, allowing for adjustments before the bond fully sets. For example, rextac rt2730 is a polyolefin hot melt with a long open time of 5 minutes, used in industrial applications ranging from mattress manufacturing to construction.
Daily Maintenance of Hot Melt Adhesive
Hot melt adhesive can
Applying adhesive at the correct temperature prevents oxidation and burning of the hot melt when the temperature is too high, or stringing and poor operation when the temperature is too low.
Applicator
The correct application temperature prevents excessive application of adhesive when the temperature is too low, or poor jetting and inconsistent adhesive application when the temperature is too low.
Pressure
If the pump pressure is too low, the flow of adhesive will be severely restricted, which may eventually lead to glue nozzles being starved of adhesive. If the pressure is too high, splashing, over-flaming, and excessive application of adhesive may occur, which is not only inefficient in the process but also dangerous.
Substrate
Best results are generally obtained with substrate temperatures above 15°c (60°f) and below 35°c (95°f). When hot melt adhesive comes in contact with a cold surface, its temperature drops rapidly, resulting in a faster setting rate and subsequent difficulty in wetting, which can lead to poor bonding.
Our Factory
SINODA is registered in 2010, it is a modern manufacturer of customized edge banding and edge adhesives specified in R&D and sales, Over the years, the company has been committed to producing same-color, environmentally friendly edge banding banding and edge banding glue for panel furniture, whole-house customization, office furniture, door factory supporting etc. The products from SINODA meet high standards and requirements in terms of quality, color, brightness or the use of adhesives are environmental, healthy and non-pollution.
Under the leadership of president Dong Bei, SINODA has pioneered the path of 'high quality, simplicity and high quality' adheres to the high-quality product route, continuously develops and innovates, and creates high-end quality.
At the same time, SINODA also adheres to the creed that 'the growth rate of employees must exceed the growth rate of the company, it will never be slacken in shaping and building its own team, improve the service system, enhance the service capabilities and be at the forefront of the industry'.
FAQ
As one of the leading hot-melt adhesive manufacturers and suppliers in China, we warmly welcome you to wholesale hot-melt adhesive made in China here from our factory. All customized products are with high quality and low price. Contact us for quotation.
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