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Key tips for using polyurethane adhesives in flexible packaging
In the flexible packaging lamination process, the application of polyurethane adhesives is of vital importance, directly affecting the performance and appearance of the final product. To ensure high-quality compounding, the following key techniques need to be mastered: 1. Substrate pretreatment is the foundation Before lamination, it is essential to ensure that the surface of the substrate film (such as BOPP, PET, PE, aluminum foil, etc.) is clean, dry, and has sufficient surface tension. It...
Why are more and more packaging bags choosing polyurethane adhesives?
Polyurethane adhesives have become the most widely used bonding materials in the field of flexible packaging mainly due to their unique chemical structure and properties, which perfectly match the complex requirements of flexible packaging. The following are several core reasons: 1. Excellent bonding universality Flexible packaging is usually composed of a variety of film materials with different properties, such as non-polar and low surface energy plastics like polyethylene and...
Which packaging bags can be bonded with polyurethane adhesive?
Polyurethane adhesives are widely used in the field of flexible packaging due to their excellent performance, almost covering the vast majority of common composite packaging bags in daily life. The following are the main usage scenarios and packaging types: 1. Packaging with high requirements for resistance to contents This is the most core application field of polyurethane adhesives. Many food and daily chemical products themselves are corrosive or contain easily permeable components,...
Introduction to Four Types of functional Polyurethane Adhesive
1. High-temperature resistant polyurethane adhesive This type of adhesive is specially designed for operation in high-temperature environments that conventional polyurethane cannot withstand. Its core feature lies in its excellent thermal stability. Main features Excellent thermal stability: Its key indicator is that it can still maintain sufficient bonding strength and structural integrity at high temperatures. The long-term service temperature usually reaches above 150°C, and specially...
The significant role of polyurethane adhesives in the field of flexible packaging.
Polyurethane adhesives are indispensable key materials in the modern flexible packaging industry, and their performance directly determines the quality, safety and functionality of packaging bags. Its role in flexible packaging is mainly reflected in the following aspects: 1. Achieve multi-layer compounding to build high-performance barriers The core advantage of flexible packaging lies in integrating multiple properties by laminating films of different materials (such as polyethylene (PE),...
The mutual cooperation between polyurethane ink binders and flexible packaging
Polyurethane ink binder is one of the most crucial and widely used materials in the modern flexible packaging industry. As the "skeleton" and "soul" of the ink, it plays a decisive role in the quality, safety and functionality of the entire packaging printed matter. Its core functions are mainly reflected in the following aspects: 1. Excellent adhesion and wide applicability There are various types of base materials for flexible packaging, including polyethylene (PE), polypropylene (BOPP,...
Characteristics and applications of polyurethane ink binders
Printing ink is a mixture formed by the uniform dispersion of components such as resin binder, pigment (filler), additives and solvents. Resin binder, as the "heart" of ink, mainly plays the role of dispersing pigments and connecting substrates. Polyurethane resin as an ink binder has the following advantages: (1)Flexibility In the field of flexible packaging printing, as the printing substrate is flexible materials such as PE, OPP, and PET, the ink film should not be too brittle after...
Can polyurethane adhesive be used for beverage packaging bags?
To sum up, the conclusion is: Yes, and polyurethane adhesives are one of the most widely used and outstanding adhesives in the field of high-performance beverage packaging at present. The main reason lies in the fact that polyurethane adhesives can perfectly meet the strict requirements of beverage packaging for safety, barrier properties and durability. The specific analysis is as follows: 1. Outstanding composite strength and flexibility: Beverage packaging bags typically adopt a...
Application of Polyurethane Adhesives in Lithium batteries and related matters
Polyurethane adhesives play a significant role in lithium battery manufacturing due to their unique properties, mainly used for the packaging and structural bonding of battery cells. 1. Main applications (1)Cell packaging (pouch battery) : This is its most core application. Polyurethane adhesives (usually in the form of heat-sealing films) are used to bond the multi-layer structures (nylon, aluminum foil, polypropylene) of aluminum-plastic encapsulation films. It must provide extremely high...
Which flexible packaging can use polyurethane adhesives?
Polyurethane adhesives, due to their outstanding performance, are one of the most widely used and important types of adhesives in the field of flexible packaging lamination. It mainly forms a high-strength and high-toughness chemical structure through the reaction of two components (the main agent and the curing agent), thereby achieving a firm bond between films of different materials. The following are the main types of flexible packaging applicable to polyurethane adhesives and their...
Why is the flexible packaging industry more inclined to choose polyurethane adhesives?
The flexible packaging industry is increasingly favting polyurethane adhesives (PU adhesives), mainly because they can fully meet the comprehensive requirements of modern packaging for performance, safety, efficiency and environmental protection, and are an ideal choice to replace traditional solvent-based adhesives and single-performance adhesives. Its core advantages are reflected in the following aspects: First of all, the outstanding composite performance is the fundamental basis for the...
Introduction to Polyurethane Adhesives for Flexible Packaging
Polyurethane adhesives for flexible packaging are key components used in flexible composite packaging materials for food, daily chemicals, pharmaceuticals and other products. Its main function is to firmly bond two or more films of different properties (such as BOPP, PET, PA, AL, CPP, PE, etc.) together to form a composite structure with various excellent properties, so as to meet the requirements for barrier properties, weather resistance, aesthetics and mechanical strength. At present, the...
Polyurethane adhesive: The Invisible Guardian of the flexible packaging industry
In modern life, flexible packaging, with its lightweight, durable and multi-functional features, is widely used in numerous fields such as food, medicine and daily chemicals. Behind this seemingly simple film composite structure, polyurethane adhesives play an indispensable role, serving as a key guarantee for the performance and safety of flexible packaging. Flexible packaging is usually composed of multiple layers of films made of different materials, such as polyethylene, polypropylene,...
The Application of Polyurethane Adhesives in Flexible Packaging
Polyurethane adhesives are indispensable key materials in the modern flexible packaging industry. Their outstanding comprehensive performance makes them the preferred bonding solution for composite film packaging. It creates packaging materials with multiple functions by firmly laminating different plastic films (such as BOPP, PET, PE, CPP, aluminum foil, galvanized film, etc.) together, and is widely used in many fields such as food, medicine, and daily chemicals. 1. Core advantages and...
The application of polyurethane resin in ink
Ink with polyurethane as the main resin binder is called polyurethane ink. The molecular structures of different types of polyurethane resins vary, and thus the types of polyurethane inks prepared from them also differ. At present, polyurethane inks can be classified into several types based on their resin structure composition, solvents and curing principles, such as one-component volatile polyurethane inks, two-component reactive polyurethane inks, UV-curable polyurethane inks and water-based...
An explanation of the role and application of polyurethane adhesives in ink printing
Polyurethane adhesives play a crucial role in the field of ink printing. Their main function is to serve as binders (or bonding materials), and they are the core components that determine the performance of inks. Main Functions: 1. Excellent adhesion: The polyurethane molecular chain contains highly polar urethane bonds, which can form a strong adhesive force with various polar (such as plastic films, metal foils) and non-polar substrates (such as polyolefins treated with corona), ensuring...
Precautions for the use of polyurethane adhesives
Polyurethane adhesives are widely used in multiple fields due to their excellent bonding performance, flexibility and fatigue resistance. To ensure its optimal performance and guarantee operational safety, the following key points should be noted during use: 1. Surface treatment is the core The surface treatment of the materials to be bonded is the most crucial link that determines the success or failure of the bonding. First of all, it is necessary to thoroughly remove contaminants such as...
Which flexible packaging can use polyurethane adhesives?
Polyurethane adhesives have become one of the most important types of adhesives in the field of flexible packaging composite materials due to their outstanding properties, such as high bonding strength, good flexibility, and excellent resistance to media (oil, acid, and chemicals). It is mainly applied in packaging structures that require high-strength composites and special functional requirements. Its wide application mainly includes the following major categories of flexible...
Overview of PU Adhesive for Flexible Packaging
Flexible packaging polyurethane adhesive is a key material used in the production of flexible packaging composite materials for food, daily chemicals, pharmaceuticals and other products. Its main function is to firmly bond films of different properties (such as BOPP, PET, PA, AL, CPP, PE, etc.) together through dry lamination process. The core component of this type of adhesive is polyurethane, which contains a large number of carbamate bonds in its molecular chain. By designing and adjusting...
Six major features of waterborne polyurethane adhesives
Waterborne polyurethane adhesives (referred to as waterborne PU adhesives) refer to adhesives made from waterborne polyurethane as the base material. They are an important type of waterborne adhesives. Due to their excellent bonding properties, outstanding solvent resistance, acid and alkali resistance, impact resistance, wear resistance, and resistance to high and low temperatures, they have developed rapidly in recent years due to the strict environmental protection requirements of the...
Matters related to the curing of polyurethane adhesives
Most polyurethane adhesives do not immediately have a high bonding strength when bonding and still need to be cured. Curing refers to the process by which liquid adhesives turn into solids. The curing process also includes post-curing, that is, the reactive groups in the initially cured adhesives further react or crystallize to achieve the final curing strength. For polyurethane adhesives, the curing process is one that enables the -NCO groups in the adhesive to react completely, or allows the...
The application characteristics of PU glue in flexible packaging
Polyurethane adhesive (PU adhesive) is one of the most crucial materials in modern flexible packaging composite processes, and its application characteristics are extremely prominent, mainly reflected in the following aspects: 1. Excellent comprehensive bonding performance: This is its most core advantage. Polyurethane adhesives have excellent bonding strength and adaptability to a variety of common substrates in flexible packaging, such as BOPP, PET, PA, AL aluminum foil, CPP, PE, etc....
Why is polyurethane adhesive used in food flexible packaging?
Food flexible packaging is usually a composite material, which is made by bonding different materials such as plastic film (such as BOPP, PET), aluminum foil, nylon, etc. through dry lamination process. This structure demands that the adhesive must possess outstanding comprehensive performance, and polyurethane adhesives precisely meet these demanding requirements. First of all, its excellent bonding performance is the cornerstone for its selection. Polyurethane adhesives have extremely...
Basic properties of polyurethane adhesive
1. Polyurethane adhesive contains isocyanate group (-－NCO) and carbamate group (-－NHCOO－-) with strong polarity and chemical activity, and has excellent chemical adhesion with materials containing active hydrogen. However, the hydrogen bond between polyurethane and the bonded material will enhance the internal force of molecules and make the bonding stronger. 2. The proportion and structure of soft segment and hard segment in molecular chain can be controlled by adjusting the formula of...
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Privacy statement: Your privacy is very important to Us. Our company promises not to disclose your personal information to any external company with out your explicit permission.