Polyolefin
Polyolefin hot melt, also known as metallocene hot melt, is a type of thermoplastic adhesive that is formulated using polyolefin materials. These materials are derived from petroleum, making the adhesive highly versatile and resistant to moisture, chemicals, and UV radiation. The term "hotmelt" refers to the adhesive's application process, which involves heating the material to a molten state and then applying it to the desired surface.Polyolefin Hot melt or metallocene hot melt exhibit exceptional bonding strength across various substrates, including paper, cardboard, plastics, and metals. Their versatility extends to both porous and non-porous surfaces, making it an ideal choice for different applications.
Advantages of Polyolefin Hot Melts
Versatility and Bonding Strength
Polyolefin Hot melt or metallocene hot melt exhibit exceptional bonding strength across various substrates, including paper, cardboard, plastics, and metals. Their versatility extends to both porous and non-porous surfaces, making it an ideal choice for different applications.
Environmental-Friendly Choice
As businesses increasingly prioritize sustainability, Polyolefin Hot melt or metallocene hot melt stand out as an eco-friendly adhesive option. It is free from harmful volatile organic compounds (VOCs) and does not release toxic fumes during application. Additionally, its longevity and durability contribute to reducing waste and the need for frequent repairs.
Quick Setting Time
One of the significant advantages of Polyolefin Hot melt is its rapid setting time. Once applied, the adhesive cools and solidifies within seconds, allowing for faster production processes and increased efficiency.
Resistance to External Factors
Polyolefin Hot melt is known for its outstanding resistance to external factors such as moisture, chemicals, and temperature variations. This feature makes it an excellent choice for applications that require durability in harsh environments.
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.
How a Polyolefin Hot Melts Differs
Polyolefin hot-melt adhesives have surpassed the efficiencies of their predecessors in many ways, which is one of the reasons why they have become so popular today.
In addition to ease of use, and lower processing costs and regulatory requirements, one of the main reasons why a polyolefin hot melt is the adhesive of choice in many markets is due to its unrivalled versatility.
Polyolefin hot-melt adhesives can be used to bond a great range of substrates from cardboard, metal, glass, leather and wood to ceramics, plastic, rubber, fabric and foam. The high viscosity of a polyolefin hot melt makes it suitable for use on both non-porous and porous substrates which would otherwise be more difficult to bond with, say, a solvent-based adhesive.
Thanks to factors such as their excellent water and moisture resistance (they don't weaken when exposed to humidity), polyolefin hot-melt adhesives create tamper-resistant seals. Hot melts can therefore be used on hot, cold and wet surfaces and, because they're thermoplastic, they can be repeatedly heated to melt and cooled to solidify. There's no one-time usage with a polyolefin hot melt, which is often the case with other adhesives.
Unlike solvent-based glues, polyolefin hot melts do not lose their thickness when they solidify. Being 100% solid formulations, hot melts shrink minimally when being cooled which is why they are excellent at filling gaps. In comparison, solvent-based adhesives rely on the extraction of a carrier to set, often resulting in a 50-70% reduction of their applied weight.
Polyolefin hot melts are favoured by many customers because they can cool down and dry almost instantly (unlike water-based and solvent-based adhesives), providing an ultra-fast method of bonding. This gives manufacturers the option of speeding up their production lines, making the entire process more efficient – perhaps one of the biggest hot melt selling points and why they are commonly used in fmcg (fast moving consumer goods) packaging applications.
What to Do with Polyolefin Hot Melts Strings
First of all, we need to understand the reasons for the drawing of Polyolefin hot melt, and solve the problem according to different reasons.
If the temperature of the Polyolefin hot melt gun or hot melt glue equipment is too low, the viscosity of the adhesive will increase, resulting in drawing. Therefore, in this case, you can consult the hot melt glue manufacturer for the construction temperature of the hot melt glue, choose an industrial high-power glue gun, or appropriately increase the equipment operating temperature.
The cohesion force of the Polyolefin hot melt is too strong, and the probability of resisting deformation of the colloid is greater during construction, making it less likely to break and causing noticeable drawing. The smaller the cohesion force, the easier it is to break during construction, and the less likely it is to have flying threads. Choosing a product with a smaller cohesion force, provided that the bonding strength of the product is satisfied, can reduce the occurrence of drawing. Alternatively, raise the construction temperature of the product to increase the flowability of the colloid to reduce drawing.
Polyolefin hot melt is fluid at high temperatures, which is mainly related to the selection and proportion of the adhesive.The shorter the curing time of the Polyolefin hot melt, the easier it is to stop flowing and the less likely it is to have drawing. Under the conditions of process permission, choosing a Polyolefin hot melt with a short curing time is more conducive to reducing drawing. If strict process requirements, choose a non-drawing Polyolefin hot melt. This can effectively reduce this phenomenon.
Under high temperature, the Polyolefin hot melt gradually undergoes cohesive destruction, and the macromolecular structure gradually decomposes into small molecules. The flowability of the adhesive increases and the curing time lengthens, resulting in drawing. In the case of determining the performance damage of the adhesive, cleaning the glue tank and replacing it with a new hot melt glue can solve this problem.
The Curing Time of Hot Melt Glue Is Crucial to the Occurrence of Drawing.
Generally, hot melt glue with a short curing time at high temperature has a low probability of drawing. When the fine thread formed at the outlet of the hot melt glue gun solidifies rapidly, it cannot be elongated and is prone to rupture, and sometimes it is not even visible that a thread has been pulled out. If the temperature is too low, the viscosity of the adhesive itself will increase, causing drawing.
Common Applications of Polyolefin Hot Melt
Packaging Industry
The packaging industry has widely embraced Polyolefin Hot melt due to its excellent bonding capabilities on different packaging materials. Whether for carton sealing, case forming, or labeling, this adhesive ensures secure and tamper-proof packaging.
Bookbinding
In the publishing industry, Polyolefin Hot melt has become the preferred choice for bookbinding applications. Its ability to provide a strong, flexible, and long-lasting bond between book components makes it an indispensable tool for book manufacturers.
Automotive Industry
In the automotive sector, where performance and reliability are critical, Polyolefin Hot melt finds extensive use in various applications. From bonding interior trim components to wire harnessing, the adhesive's resistance to heat and chemicals ensures lasting performance.
Textile and Non-woven Industry
Polyolefin Hot melt has found a niche in the textile and non-woven industry for bonding fabrics and creating laminates. Its non-toxic nature makes it suitable for applications in baby products and personal care items.
Foam coating of polyolefin hot melt
In some special applications, in order to obtain the function of cushioning or shock absorption while reducing the amount of glue used, a special foamable glue machine can be used to mechanically mix nitrogen into the molten hot-melt pressure-sensitive adhesive, An air-filled polyolefin hot melt pressure sensitive adhesive is formed. Then apply the hot-melt pressure-sensitive adhesive that has been mechanically foamed on the workpiece through the nozzle.
Flat die scraping for polyolefin hot melt
This is a more common scraping method. After the molten polyolefin hot melt pressure sensitive adhesive passes through the heated throat, it is evenly distributed in the guide channel in the die, and then extruded from the lip of the die that can preset the thickness and width of the film. Most industrial hot-melt pressure-sensitive adhesive tapes and labels are applied using a die coating process.
Roller glue application for polyolefin hot melt application
The molten hot-melt adhesive is conveyed into a rotating rubber tank, and the upper rubber roller rotates in the rubber tank, and the molten hot-melt adhesive on the upper rubber roller is scraped evenly by the scraper, and the product contacts the rotating rubber roller to evenly apply glue. This gluing method is mainly used for fabric coating and compounding, and panel gluing, especially suitable for gluing furniture such as tables, chairs, cabinets, etc.
Dot-shaped gluing of hot-melt adhesive
Spot gluing is a fairly economical and fast simple process when two substrates only need to be bonded in part. Spot gluing is commonly used in the bonding of folding cartons or cardboard.
Strip gluing for polyolefin hot melt
Similar to dot gluing, this transparent polyolefin hot melt process can be used when the two objects only need to be combined in strips. Common applications are the edges of plastic boxes, such as PET curtain boxes, wine bottle boxes and cosmetic boxes.
Curtain spray glue for polyolefin hot melt application
When the object to be coated needs to obtain a fully coated glue area due to insufficient heat resistance (such as PE film) or uneven surface of the workpiece, the non-contact (suspension) curtain spray glue can provide a similar contact die effect.
Spiral glue spraying for polyolefin hot melt application
This is one of the most common ways to spray transparent polyolefin hot melt. With the help of external air pressure, the hot-melt pressure-sensitive adhesive is ejected into a regular spiral glue thread from the spray sheet with fine orifice in the nozzle. Applying glue in this way can drastically reduce the amount of glue used per unit area. Most of the structural adhesives for diapers and sanitary napkins are glued by spiral spraying.
Fibrous spray glue for polyolefin hot melt
Its glue spraying process is basically quite similar to the spiral glue spraying method, except that the shape of the glue sprayed out is irregular, and the amount of glue sprayed per unit area is lower than that of the spiral glue spraying method. The most common application market is disposable sanitary materials, such as disposable mattresses, surgical gowns, caps, shoe covers, etc.
Conventional standard for Polyolefin Hot Melts
Diameter standard
There are only 2 standard diameters for polyolefin hot melt , 7mm small and 11mm large . 7mm±0.3mm or 11mm±0.3mm are also close to the size that need. The standard error range for diameter is ±0.2mm.
length standard
The standard length of polyolefin hot melt is 27CM and 30CM. But some e-commerce platform customers will customize: 10CM, 15CM, 19CM, 20CM, 25CM and other special lengths. The error range of the length standard is about ±3mm.
Softening point standard
The critical point at which the polyolefin hot melt softens is called the softening point. The softening point of ordinary polyolefin hot melts type hot melt sticks is generally around 80 ℃. Tested by a professional softening point tester. There are also require hot melt to have temperature resistance requirements, generally 100℃, 110℃, 120℃, and 130℃ softening point requirements.
Standard of viscosity
Viscosity refers to the thin consistency. Generally, the viscosity is tested by the ring and ball method, which refers to the thinness of the polyolefin hot melt adhesive at 180 ℃. The higher the viscosity value, the thicker the hot melt adhesive, and the harder it is to glue. The lower the viscosity value, the thinner the hot melt adhesive, and the easier it is to glue. The general standard hot melt adhesive viscosity is about 6000CPS.
How to Choose the Right Polyolefin Hot Melts
Polyolefin hot melts melting point of the glue
The melting range is usually called the melting point in the hot melt adhesive industry. Calling the melting point is actually not very accurate. Because the melting of hot glue is a temperature range, it is more scientific to call the melting range.
The melting range of hot glue refers to a temperature range from the initial melting point to the final melting point of the hot melt adhesive glue, which is one of the most basic properties of the hot melt adhesive.
Generally, the melting range of all hot melt adhesives will exist between 30°C and 120°C. The melting range of lower temperature hot melt adhesive is about 30℃-50℃, the melting range of medium temperature hot melt adhesive is about 50℃-80℃, and the melting range of high temperature hot melt adhesive is about 80℃-110℃.
Melt index of hot melts
Melting is mainly to indicate the fluidity of the hot melt adhesive after it has melted. The larger the melt index, the better the fluidity, and the smaller the melt index, the worse the fluidity.
Melt index is a very important parameter in addition to the melting range of hot glue. It is directly linked to the ease of use of hot melt adhesives.
Because the fluidity of the glue directly affects the sizing process of the glue, the better the fluidity, the faster it will spread and wet out on the bonded surface during sizing. If the fluidity is poor, the speed of spreading and wetting is relatively poor, and relatively speaking, the sizing time will be longer.
Operating temperature and pressing time of hot melts
The biggest feature of hot melt adhesive is short operating time and high working efficiency. The operating temperature and pressing time of hot melt adhesives are the process parameters that must be mastered when purchasing. The operating temperature and pressing time correspond to the two physical and chemical parameters of hot melt adhesive melting range and melting index.
It should be noted that the operating temperature of the hot glue is not the value of the melting range, but is generally about 30°C higher than the final melting point in the melting range. Of course, the specific temperature must be adjusted according to the melt index of the hot melt adhesive.
High and low temperature resistance of hot melts
Since hot melt adhesive is a kind of thermoplastic material, due to the characteristics of hot melt adhesive, hot melt adhesive generally has poor high temperature resistance. Generally, the hot melt adhesive with the best temperature resistance will not exceed 100°C, but the low temperature resistance performance will vary greatly depending on the material.
FAQ
As one of the leading polyolefin manufacturers and suppliers in China, we warmly welcome you to wholesale high quality polyolefin from our factory. Also, custom service and cheap products are available.