Polyolefin Hot Melts for Packaging
Polyolefin hot melt adhesives are generally high molecular weight compounds. The Adhesive's low surface energy and capability to wet almost all polymeric (plastic) and metallic substrates, makes them a general purpose hot melt adhesive. The molecular weight of polyolefin-hot-melt used in the adhesive formulation is high. Using polyolefine, end users increase heat seal strength (warm strength and heat resistancy), viscosity and the hot tack properties. On the other side the use of Polyolefine against EVA increases the flexibility and low temperature performance of most of our hot melt adhesives. Polyethylene, polypropylene and their derivatives, amorphous polyolefins and chlorinated polyolefins may be considerd in our polyolefin (or metallocene) adhesive formulations.
Advantages of Polyolefin Hot Melts For Packaging
Improved thermal stability
A striking advantage of polyolefins is their improved thermal stability. Even after longer periods of time in the adhesive tank, the viscosity and processing properties remain constant. This reliability is crucial for production processes that require consistent quality over long periods of time.
Ersatile utilisation in deep-freeze applications
The suitability for bonding in deep-freeze applications makes polyolefin hot-melt adhesives an ideal partner in industries such as food packaging and logistics. They retain their adhesive properties even at extremely low temperatures.
Broad adhesion spectrum
The broader adhesion spectrum on low energy surfaces such as PP opens new possibilities for applications where strong adhesion to difficult substrates is required. The versatility of polyolefins is also reflected in the variable open time, which can be set from very short to very long, depending on the recipe.
Improved End of Life
They are able to replace solvent-based adhesives, offering compatibility with bio-based and renewable materials, which improves recyclability levels. They also offer a long shelf life and decreased adhesive consumption compared to other technologies, which reduces waste.
Why Choose Us
Our Factory
Zhejiang Good Adhesive Co., Ltd was established in 1996 in China, covers an area of more than 10000 square meters with annual output of 30000tons of environmental friendly hot melt adhesive series products base on EVA, polyolefin, elastomer, polyurethane, PA and animal protein.
Our Products
We specialize in researching, manufacturing, and selling hot melt adhesive with annual output of 30000tons of environmental friendly hot melt adhesive series products base on EVA,polyolefin,elastomer,polyurethane,PA and animal protein.
Applications fields
Applications fields cover bookbinding industry, packaging industry, tape and label coating, automobile assembly, interior decoration and damping sealing, air filter making, sanitary and medical products making, furniture industry, pest control, etc.
R&D Team
We have our own lab and R&D team, can provide you technical supports at any time. Raw materials are imported from American Dupon and Exxon, Canadian AT, Japanese TOSOH, etc., and our stric QC system will be the best safeguard for you.
Key Application Points of Polyolefin Hot Melts For Packaging
Material Selection and Performance Matching
The selection of hot glue for cardboard boxes needs to consider various factors such as the properties of the materials to be bonded, packaging requirements, and production conditions. Different types of hot melt adhesives vary in viscosity, open time, curing speed, etc., so it is essential to ensure that the selected hot melt adhesive matches the material of the carton to achieve the best bonding effect.
Equipment Adjustment and Operational Norms
The bonding effect of hot melt adhesive is also influenced by packaging equipment. On high-speed production lines, it is necessary to ensure that the hot melt adhesive spray gun works stably to avoid issues like leakage or uneven application. Additionally, operators must strictly follow operational procedures to ensure that the sealing position is pressed within the open time of the hot melt adhesive to guarantee bonding quality.
Environmental Control and Temperature Management
Ambient temperature significantly affects the curing speed and bonding effect of hot melt adhesive. In cold environments, the curing time of hot melt adhesive shortens, which may result in weak bonding. Therefore, manufacturers with conditions should control the working environment temperature within a suitable range (e.g., above 20 degrees Celsius) before bonding production to fully leverage the bonding performance of hot melt adhesive.
Quality Control and Testing
To ensure the bonding quality of packaging cartons, strict quality control should be conducted during production. This includes regular testing of the adhesive strength of the hot melt adhesive to ensure that the packaging box remains stable even under different load conditions. Additionally, attention should be paid to the external appearance quality of the packaging boxes to avoid excessive penetration of hot melt adhesive affecting aesthetics.
What to Consider When Choosing a Polyolefin Hot Melts For Packaging
The color of carton sealing glue
Due to the different colors of the objects to be adhered, the color requirements for the hot-melt sealing glue should be different. If the adherend itself has no special requirements for color, it is recommended to use white hot melt adhesive. Generally speaking, white hot melt adhesive is more viscous than yellow.
Surface treatment of hot melt carton sealing adhesive to be adhered
The surface treatment of hot melt adhesive is not as strict as that of other adhesives, but the dust and oil on the surface of the adhered should also be properly treated, so that the hot melt china adhesive can play a better role in bonding.
Working time of hot melt carton sealing glue
Fast operation is a major feature of hot melt sealing glue. The operation time of hot melt adhesive is generally about 15 seconds. With the wide application of modern production methods - assembly line, the operation time of hot melt adhesive is required to be shorter and shorter.
The temperature resistance of hot melt carton sealing glue
Hot melt adhesives are sensitive to temperature. When the temperature reaches a certain level, the hot melt adhesive begins to soften; below a certain temperature, the hot melt adhesive will become brittle, so the choice of hot melt adhesive must fully consider the environmental temperature changes.
The viscosity of hot melt carton sealing glue
The viscosity of hot melt sealing adhesive is divided into early viscosity and late viscosity. Only when the early viscosity and late viscosity are consistent, can the hot melt adhesive and the adherend remain stable. In the production process of hot melt adhesive, it should be ensured that it has oxidation resistance, halogen resistance, acid and alkali resistance and plasticity.
Carton and Case Sealing - Carton and case sealing is a major application area . Polyolefin is frequently used for this application because of its excellent adhesion on paper and cardboard, ease of application and low cost. Additives can alter the properties of Polyolefin for use in extreme cold temperatures sometimes needed for beverage cases (down to -40F), as well as for higher temperature ranges (up to 150F).
Paper-goods - Everything from paper cups to bags to spiral wound tubing, can be adhered with adhesives. Polyolefin are also a common choice due to ease of use in high throughput assembly lines. Specialty formulations for products expected to reach high temperatures may be needed.
Plastic container bonding - Can also be used in plastic containers. Polyolefin-based offer improved bonding to these low-energy surfaces. Care must be taken that the application temperature is low enough not to affect the substrate, so low-temperature are often used.
Labeling - Labeling on all types of containers can be achieved quickly and economically. Depending on the substrate (glass, metal plastic, etc.) and environmental conditions, different types of may be used.
Materials Used in Polyolefin Hot Melts For Packaging
Polyolefin hot melt adhesives, and more particularly to a hot melt adhesive made from a blend of a polypropylene -based polymer, a polyolefm elastomer, and an amorphous polyolefm. These adhesives exhibit excellent molten and pre-set flow allowing them to wet out substrates yet develop properties needed to form and maintain strong bonds making them useful for hygiene, construction, and packaging applications.
Hot melt adhesives are used to bond substrates using a wide range of application methods and process conditions for a large variety of end-uses. For example, hot melt adhesives are employed to bond non-woven materials, polymeric films, and elastomeric components in numerous fabricated articles. Laminate structures with hot melt adhesives serving to bind nonwoven materials and elastomeric components in a form of strands, films, or any other continuous or discrete form are especially useful in hygiene products like diapers.
Processing of hot melt adhesives is linked to their ability to be melted, transported and/or coated in a molten stage at the final location where the bond is required. Molten adhesives can be sprayed or coated as thin layers. Once cooled, the adhesive needs to fulfill multiple requirements such as suitable bond strength measured by peel force or bond retention during or after mechanical stress, and during or after various thermal conditions.
Hot melt adhesives can be based on polymers such as polyolefms (ethylene- or propylene -based polymers), or functionalized polyolefms (ethylene or propene copolymers with oxygen containing monomers), or styrenic block copolymers containing at least one rubbery phase, like styrene-isoprene-styrene (SIS), or styrene- butadiene-styrene (SBS) polymers. Styrenic block copolymers are commonly employed due to their dual characteristics, i.e. cohesion of the styrenic phase associated with the rubbery behavior of the poly(butadiene) or poly(isoprene) phase.
Polyolefin Hot Melts Adhesive Product Forms
Hot Melt Pellets and Pastilles
Pellets and pastilles are common forms of hot melt adhesives. They are best suited for applications where rapid melting is necessary to keep the manufacturing process running at a high pace. These small pebble-like adhesives are packaged in various forms and can be used with auto-feeding systems to improve efficiency on production lines. Hot melt pellets and pastilles are melted and applied using nozzles, which can place a bead, line, or spray the adhesive on the substrate.
Hot Melt Adhesive Chubs
Similar to hot melt blocks, another common product form is a hot melt chub. This product was developed to integrate faster into molten form in a hot melt tank. Chub form – which is a 1 Kilo (2.2-pound) solid chub with an integral film wrapper. The wrapper, which melts in with the adhesive, makes the product convenient to handle and substantially reduces packaging waste.
EASYFLOW® Hot Melt Adhesive System
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:
Auto-feeding
Closed system
Melt on demand
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.
Hot Melt Blocks
Hot melt blocks are commonly used for bonding and coating polyethylene terephthalate, polyethylene, and other polyolefins. The blocks are commonly placed in hot melt tanks to become molten and applied with specialized dispensing nozzles to the substrate.
Polyolefin Hot Melts Materials It Can Bond
Cotton: Common in clothing and home textiles.
Polyester: Used in garments, upholstery, and technical textiles.
Nylon: Popular in activewear, outdoor gear, and technical fabrics.
Spandex (Lycra): Used in stretchable garments like sportswear.
Blended Fabrics: Combinations of natural and synthetic fibers, such as cotton-polyester blends.
Non-woven Fabrics: Used in medical products, filters, and disposable items.
PE (Polyethylene): Used in packaging, containers, and plastic films.
PP (Polypropylene): Found in automotive parts, textiles, and consumer goods.
PET (Polyethylene Terephthalate): Common in bottles, packaging, and textile fibers.
PVC (Polyvinyl Chloride): Used in pipes, vinyl flooring, and signage.
PS (Polystyrene): Used in packaging, disposable cups, and insulation materials.
Aluminum: Used in automotive parts, packaging, and construction materials.
Steel: Common in construction, automotive, and industrial applications.
Copper: Used in electrical components and plumbing. Proper surface treatment (e.g., cleaning, roughening, or priming) is often required for optimal bonding.
Natural Rubber: Used in tires, footwear, and industrial products.
EPDM (Ethylene Propylene Diene Monomer) Rubber: Used in roofing, seals, and automotive applications.
SBR (Styrene-Butadiene Rubber): Used in tires, footwear, and industrial products.
PE (Polyethylene) Foam: Used in packaging, insulation, and cushioning materials.
EVA (Ethylene Vinyl Acetate) Foam: Used in sports equipment, footwear, and padding.
PU (Polyurethane) Foam: Common in furniture, bedding, and automotive applications.
Tempered Glass: Used in safety applications such as windows and doors.
Laminated Glass: Used in automotive windshields and architectural applications.
Decorative Glass: Used in interior design and artistic applications.
How to Replace the Polyolefin Hot Melts
With the change of hotmelt, for example for a test or a definitive change to new adhesive, there are some things you have to keep in mind to prevent issues on the long term.Although hotmelts often looks the same (colour and shape), the specifications and the used of raw materials can be very different.The appearance at room temperature doesn’t say much about the chemical composition and although that it often goes well in practice, a mixture from two similar looking hotmelts can cause a chemical intolerance reaction which can result in huge problems.Even the chemical tolerant hotmelts can, when mixed, because of the mutual differences in for example viscosity, cause problems or at least be the cause of a failed test or an unrepresentative review of the adhesion performance.
Change of glue – what to check in advance?
Before you go ahead with the change of adhesive it is recommended to have the tolerance of the adhesive tested. The adhesive supplier can, with a small amount of glue, do a relatively simple lab test which will tell you more about the chemical tolerance of the adhesive.If the result of the test shows intolerance the next steps should be executed with extra care.
Step one
First of all the adhesive should be removed from the system as much as possible. De adhesive tank can be drained by using the drain point. Take the necessary precautions because of the release of hot adhesives. It is recommended to check the main filter for excessive pollution. If the filter is heavily polluted it needs to be changed.
Step two
When the tank is empty, the whole system needs to be set on a low temperature. A temperature around 20 – 30 degrees beyond the melting point of the new hotmelt can be maintained. This is called the “Ring & Ball Temperature”. After this the tank is ready to be filled with the new hotmelt.
Step three
In order to prevent the existing pollution in the system (burnt particles etc.) to reach the small channels of the nozzles and cause blockages, it is recommended to disconnect the tubes.
When the new is hotmelt has melted in the tank, the rinsing of the tubes can be started.
Because the new adhesive has a higher viscosity at low temperature, the present old adhesive is pushed out of the tubes. A higher pump pressure is required.
Step four
When the rinsed hotmelt that is released at the end of the disconnected tubes looks clean and consistent, the system must be depressurized and the nozzles can be assembled.
Step five
If there are ‘in-line’ filters placed before the nozzles it is recommended to renew those. After assembly of the nozzles they should be rinsed as last with the new hotmelt.
FAQ
As one of the leading polyolefin hot melts for packaging manufacturers and suppliers in China, we warmly welcome you to wholesale high quality polyolefin hot melts for packaging from our factory. Also, custom service and cheap products are available.
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