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Three aspects of understanding flexible packaging polyurethane laminating adhesives
1. Raw Material Composition The flexible packaging polyurethane laminating adhesive is composed of polyols and isocyanates as the core raw materials, forming a two-component system of main agent and curing agent. The main agent mostly uses polyester polyols and polyether polyols, and is adjusted with additives to regulate the wetting property. The curing agent is mainly composed of isocyanate adducts. According to the type of solvent, it can be classified into solvent-based, solvent-free, and...
Polyurethane laminating adhesive: Empowering the high-quality development of pesticide packaging
Pesticide packaging serves as a crucial barrier to ensure the safety of pesticide storage, transportation and use. Polyurethane laminated adhesive, with its outstanding comprehensive performance, has become the core bonding material for modern pesticide composite packaging, safeguarding the stability and safety of pesticide packaging. Pesticides generally have corrosive and penetrating properties, and they require extremely high standards for the media resistance, sealing, and bonding...
The application of water-based polyurethane laminating adhesive in the flexible packaging industry
Water-based polyurethane laminating adhesive uses water as the dispersion medium. With advantages such as environmental friendliness, safety, and stable performance, it has now become one of the mainstream materials in the field of soft packaging composites, aligning with the development trend of green transformation in the industry. This laminating adhesive has no volatile harmful solvents, has a low odor, and excellent flame retardancy. During production and use, it does not cause air...
Is Polyurethane Laminating Adhesive Suitable for Liquid Flexible Packaging?
Polyurethane laminating adhesive is completely suitable for liquid flexible packaging applications, and it is also the mainstream bonding material for liquid beverages, sauces, daily chemical liquids, etc. With its excellent comprehensive properties, it has become the core bonding consumables for liquid flexible packaging. Liquid flexible packaging has strict requirements for adhesives, which need long-term resistance to liquid immersion, acid and alkali, anti-delamination degumming and...
Overview of polyurethane laminated adhesive used in food packaging analysis
Food packaging can be divided into ordinary packaging and high-performance packaging. The corresponding polyurethane laminating adhesives can be divided into four categories: (1) general use, (2) steaming use, (3) transparent cooking use, (4) aluminum foil cooking use. Polyurethane laminated adhesive with composite film for general packaging generally includes adhesive for dry food packaging and adhesive for boiling sterilization at 70 ~ 100℃. Usually, such adhesives are two-component...
Polyurethane laminated adhesive will dominate the field of drug flexible packaging.
Bubble-cap packaging is made by placing the medicine in the pit of plastic hard sheet formed by plastic suction, and then bonding and heat sealing the plastic hard sheet with an aluminum foil printed by gravure and coated with protective agent and adhesive, so that the medicine can be safely protected. The main materials of blister packaging are medicinal FFP aluminum foil, plastic hard sheet (polyvinyl chloride PVC) and adhesive. In the early days, single-component pressure-sensitive...
Polyurethane laminated adhesive: the core support of flexible packaging industry
Flexible packaging is the mainstream packaging form in the fields of food, medicine, daily chemical, etc. Polyurethane laminated adhesive, as the core raw and auxiliary materials of composite flexible packaging, has become the key cornerstone of the industry development with its excellent performance, accounting for over 80% of the domestic flexible packaging adhesive market, and the two are deeply bound and developed synergistically. Polyurethane laminated adhesive has outstanding advantages...
Environmental protection has been the core development direction of flexible packaging polyurethane laminating adhesive, which is promoted by multiple factors such as policy, market, safety and industry upgrading. With the tightening of environmental protection laws and regulations in packaging industry, VOC emissions, harmful solvent residues and heavy metal indicators are strictly controlled. Traditional solvent-based polyurethane adhesive has a strong smell and heavy pollution, and it is...
Properly dispose of unused flexible packaging polyurethane laminating adhesive.
Flexible packaging laminated polyurethane adhesive is a common auxiliary material in the compound production of food and daily chemical packaging, which has the characteristics of strong adhesion and wide adaptability. However, due to its special chemical properties, if the unused adhesive is stored and discarded at will, it will not only cause waste of raw materials, but also lead to curing failure, potential safety hazards and environmental pollution problems, so it must be standardized and...
The role of curing agent in flexible packaging polyurethane laminating adhesive
Curing agent is the core component of two-component polyurethane laminating adhesive. When used together with the main agent, it determines the adhesive strength, molding effect and weatherability, and is an indispensable key raw material for flexible packaging compounding. First, it plays the role of cross-linking and film forming. Curing agent molecules can react chemically with polyurethane main agent, and linear molecules cross-link with each other to form a dense three-dimensional...
Effect of humidity on flexible packaging polyurethane laminating adhesive
Polyurethane laminated adhesive is the core material of flexible packaging composite production, and environmental humidity is the key factor affecting its curing effect, bonding strength and finished product quality. High humidity environment can easily lead to various composite quality defects, which is the key link of flexible packaging production control. The curing core of polyurethane laminating adhesive depends on the cross-linking reaction between isocyanate and main agent, and the...
Effect of temperature on flexible packaging polyurethane laminating adhesive
Polyurethane laminated adhesive is the core material of flexible packaging composite production. As a key process parameter, temperature directly affects the viscosity, curing reaction, bonding strength and stability of finished products, and is the core element to control the composite quality of packaging. Low temperature environment has a significant negative impact on the properties of laminated adhesives. When the ambient temperature is lower than 10℃, the molecular activity of...
Construction pretreatment technology of flexible packaging material polyurethane laminated adhesive
Pre-treatment of flexible packaging films, aluminum foils and other substrates must be done well before coating polyurethane laminating adhesive, which is the core process to ensure the composite bonding effect and prevent quality problems such as delamination, foaming and weak bonding, which directly determines the stability of flexible packaging products. The first process is cleaning and degreasing the substrate. Dust, oil stain, release agent and water vapor are easily attached to the...
Causes of bubbles in the construction of flexible packaging polyurethane laminated adhesive
Bubbles are common quality problems in soft packaging after coating and laminating with polyurethane laminating adhesive, which are mainly caused by four factors: raw materials, technology, environment and substrate. On the raw material level, improper preparation of adhesive is easy to cause bubbles. Unbalanced ratio of curing agent and main agent, too fast mixing speed and large amount of air, or glue stored for a long time and mixed with moisture impurities will all form bubbles after...
Flexible packaging polyurethane laminating adhesive-Excellent flexibility
Polyurethane laminated adhesive for flexible packaging is the core material of flexible packaging composite technology. Its excellent flexibility is the core advantage different from ordinary laminated adhesive, and it is also the key performance to ensure the quality and service life of flexible packaging products. Relying on the unique molecular structure characteristics, the cured adhesive layer has both elasticity and toughness, which can perfectly meet the deformation requirements of...
The four unique advantages of flexible packaging polyurethane laminated adhesive
Flexible packaging polyurethane laminating adhesive is the core adhesive for packaging composites in industries such as food, cosmetics, and medicine. With its four unique properties, it has become the mainstream bonding material in the flexible packaging industry. It is suitable for various film and aluminum foil composite production needs, and its practicality and adaptability far exceed those of ordinary laminating adhesives. 1. Extremely flexible and adaptable. The cured adhesive layer...
In the fields of cold chain logistics, frozen food, and low-temperature storage, flexible packaging materials often encounter severe low-temperature challenges. Ordinary laminating adhesives are prone to cracking, delamination, and adhesive failure. Flexible packaging polyurethane laminating adhesives, with their exceptional low-temperature resistance, have become the core preferred material for flexible packaging composite processes, perfectly adapting to various low-temperature usage...
Discussion on the Heat Resistance of Flexible Packaging Polyurethane Laminating Adhesive
Flexible packaging polyurethane laminating adhesives are the core material for film composites. Their heat resistance directly determines the stability of flexible packaging products during high-temperature boiling, heat sealing processing, and high-temperature storage conditions, and is a key indicator for evaluating packaging quality. Ordinary polyurethane laminating adhesives have excellent adhesion performance at room temperature, but they have shortcomings in heat resistance. In...
As soft packaging undergoes upgrades towards higher-end, more functional, and safer designs, ordinary laminating adhesives have failed to meet the demanding requirements of high-temperature boiling and high-temperature sealing processes. Heat-resistant polyurethane laminating adhesives, with their outstanding comprehensive performance, have become indispensable high-end core materials in the soft packaging field and are widely used in high-end packaging scenarios such as food, medicine, and...
Application of Polyurethane Laminating Adhesive in Metal Film Composites
Polyurethane laminating adhesives can be fully utilized for the composite of metal films. They are also the mainstream bonding materials for the composite of metal films such as aluminum foil and aluminum-coated films with plastic films. They are widely applied in fields like flexible packaging and moisture-proof barrier materials. This laminating adhesive has excellent adhesion compatibility with metal films. The polar groups in the adhesive liquid can form a stable bond with the surface of...
Analysis of Bonding Strength of Different Flexible Packaging Polyurethane Laminated Adhesives
Polyurethane laminating adhesive is the core material of flexible packaging composite processing, and its bonding strength directly determines the bonding stability, weatherability and safety of composite film. Different types of polyurethane laminating adhesives have different formulations and process characteristics, and the adhesive strength performance is significantly different, which is suitable for different production and use scenarios of flexible packaging. Dry-cured polyurethane...
Matters needing attention in curing polyurethane adhesive
The curing effect of polyurethane adhesive directly determines the bonding firmness. During the whole curing process, environmental control, operation specification and post-curing should be done well to avoid all kinds of problems affecting the curing reaction and ensure the bonding quality to meet the standard. During curing construction, it is necessary to control the site environmental conditions and keep the normal indoor temperature. The environment should not be too cold or too hot,...
List of commonly used supporting equipment for flexible packaging polyurethane adhesive
Polyurethane adhesives for flexible packaging are divided into solvent-based, solvent-free, single-component and two-component types, which are suitable for compound production of various soft substrates such as plastic film, aluminum-plastic film and aluminum-plated film. The construction needs to be matched with special complete sets of equipment to ensure accurate proportioning, uniform coating and firm compound throughout the process, which meets the production process standards of flexible...
Why do different polyurethane adhesives have different curing times?
For the same type of polyurethane adhesive, some can be set within 10-15 minutes and reach the standard in a few hours, while others take several days to dry completely. The difference in curing time is significant. The core issue is not the quality of the adhesive itself, but rather the combined effect of four factors: chemical curing principle, formula design, environmental conditions, and construction method. The curing of polyurethane adhesive is not simply the evaporation of moisture; it...
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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.