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The five key features of flexible packaging polyurethane laminating adhesive
In the production of flexible packaging composites such as food, daily necessities, and medicine, polyurethane laminating adhesives are the mainstream composite adhesives in the industry. Due to their unique molecular structure advantages, they are suitable for various film lamination processes. Compared with ordinary water-based adhesives and chloroprene adhesives, they have significant advantages. The core features include five aspects, which fully meet the production and usage requirements...
With the rapid development of industries such as food, medicine, and daily chemicals, multi-layer laminated flexible packaging has taken the dominant position in the packaging market due to its advantages of lightness, preservation, and light-blocking. In the flexible packaging lamination process, adhesives are the key raw materials that determine the firmness between packaging layers, the safety for use, and the service life. Nowadays, polyurethane laminating adhesives, with their...
A Brief Analysis of the Initial Adhesion of Flexible Packaging Polyurethane Laminating Adhesives
The initial adhesion force is the core performance indicator of polyurethane laminating adhesives for flexible packaging. It refers to the initial adhesive ability of the adhesive to quickly adhere and fix the film substrate after being coated and laminated, without the need for continuous external pressure for a short period of time. It directly determines the stability of the flexible packaging laminating process and the qualification rate of the finished products, and is a key parameter that...
Polyurethane laminating adhesives are the core materials in the flexible packaging laminating process. According to the formulation system, they can be divided into solvent-based and solvent-free types. These two types differ significantly in composition, process, environmental friendliness, performance during use, and cost, and are suitable for different requirements of flexible packaging production. In terms of composition and solid content, solvent-based adhesives use ethyl acetate as the...
Analysis of the Peel Strength of Flexible Packaging Polyurethane Laminating Adhesive
Peel strength is the core indicator for evaluating the reliability of adhesion in flexible packaging composite films. It directly determines the sealing performance, weather resistance and service life of polyurethane laminating adhesive composite products, and is widely used in flexible packaging fields such as food, cosmetics and medicine. The higher the peel strength value, the stronger the interlayer bonding force of the lamination film, and the less likely the packaging is to have quality...
Reasons why flexible packaging polyurethane laminating adhesive can not be mixed at will
Flexible packaging polyurethane laminating adhesives are the core materials in laminated packaging production. Many people mistakenly believe that similar polyurethane laminating adhesives have similar properties and can be mixed at will. However, in fact, there are significant quality risks involved. Different models and brands of adhesives must not be mixed at will. The first issue is the incompatibility of chemical formulations. The resin structures, active groups, and additive ratios of...
The flexible packaging polyurethane laminating adhesives are classified into three types based on production line speed: low-speed, medium-speed, and high-speed composite. They are suitable for different production capacities, adhesive types, and production requirements, and have significant differences in process characteristics. The low-speed lamination line speed is generally ≤ 80m/min, mostly for small dry lamination machines, suitable for general-purpose solvent-based PU adhesive. The...
Flexible packaging polyurethane laminating adhesive is the core material for the production of composite packaging in industries such as food and daily chemicals. The stability of adhesion directly determines the quality of the packaging products. During practical operations, by controlling the four key aspects well, common problems such as delamination, stickiness, and odors can be effectively avoided, ensuring the qualified rate of production. 1. Surface treatment of the substrate. Before...
Analysis on Weather Resistance of Flexible Packaging Polyurethane Laminating Adhesive
Flexible packaging polyurethane laminating adhesive is the core material of food, daily chemical and outdoor packaging lamination molding, and its weatherability directly determines the service life and stability of lamination film, which is the key index to measure the comprehensive quality of adhesive. When packaging is stored, transported and used outdoors, it is often affected by ultraviolet radiation, alternating temperature and humidity, damp-heat aging and other environmental factors,...
Polyurethane laminating adhesive is a commonly used bonding material. It has strong adhesion and quick curing properties. If it accidentally comes into contact with the skin, do not panic. Mastering the correct handling method can effectively prevent skin irritation, redness, swelling and allergic reactions. If adhesive gets on your skin, you need to deal with it immediately. Before the adhesive has fully dried, quickly use a clean cloth or tissue to gently wipe away the excess adhesive from...
Before using the polyurethane laminating adhesive, it is necessary to conduct a preliminary test.
Before using the flexible packaging polyurethane laminating adhesive, a pre-test must be conducted. This is a crucial process in ensuring product quality, avoiding production risks, and meeting industry standards in the flexible packaging composite production. It is by no means an optional step. Even if the adhesive parameters meet the factory standards, it cannot be directly put into mass production. The production of flexible packaging is influenced by multiple factors such as the...
Why do the curing times of different flexible packaging polyurethane laminating adhesives vary?
The curing process of flexible packaging polyurethane laminating adhesives is essentially a process where isocyanates and hydroxyl groups undergo cross-linking reactions to form a dense adhesive layer. The curing times of different adhesives on the market vary significantly, and the core reason lies in the multiple influences of the formulation system, ratio, and environmental conditions. The formulation of the adhesive itself is the core influencing factor. Different products use different...
Flexible packaging polyurethane laminating adhesives are classified into several major categories.
Flexible packaging polyurethane laminating adhesives are key materials in the production of flexible packaging lamination. Due to their excellent flexibility, high bonding strength, and wide adaptability to substrates, they are widely used in packaging fields such as food, medicine, and cosmetics. According to the solvent system, formulation structure, and construction characteristics, the industry mainstream classifies them into three major categories: solvent-based, non-solvent-based, and...
Flexible packaging polyurethane laminating adhesive outdoor usage instructions
The conventional ordinary polyurethane adhesive laminated packaging bags are not recommended for long-term outdoor use in the open air. They can only be temporarily stored in a shaded area. Customized products with weather-resistant formulas can be stored outdoors for a long time. The PU laminated rubber layers of ordinary flexible packaging are mostly of polyester-based systems, and their water resistance and UV resistance are relatively weak. The ultraviolet rays in outdoor sunlight...
Safety is the bottom line of enterprise development, the cornerstone of production and operation, and the solid guarantee for every employee to work safely. In order to further strengthen the staff's awareness of safety in production, consolidate the company's emergency response capability, comprehensively test the practicality and completeness of fire-fighting facilities and emergency equipment, and enhance the self-rescue, mutual rescue and cooperative rescue capabilities of employees in...
When the flexible packaging film is laminated with polyurethane adhesive, irregular white spots and white dots often appear on the surface of the finished product, seriously affecting the appearance and quality of the packaging. This problem is not caused by a single factor. It mainly lies in four aspects: chemical reaction, process operation, material matching, and equipment environment. It is a common quality issue in the production of flexible packaging laminating. The production of gas...
The Importance of the Ratio of Two-Component Polyurethane Laminating Adhesive
The two-component polyurethane laminating adhesive consists of the main agent and the curing agent. The ratio directly determines the degree of cross-linking reaction and is the core factor affecting the bonding quality. An imbalanced ratio will damage the performance of the adhesive layer in terms of curing, bonding, and weather resistance. The amount of curing agent is insufficient, resulting in a lack of crosslinking groups. The resin cannot fully react and cure. The adhesive layer...
Common curing agents for flexible packaging polyurethane laminating adhesives
The curing agent for flexible packaging two-component PU glue is mainly composed of modified products of polyisocyanates. It is selected in three major systems: solvent-based, non-solvent-based, and dedicated for boiling treatment. The main types are aromatic and aliphatic. The most commonly used solvent-based dry bonding adhesive is the TMP-TDI addition product, which is formed by the addition of toluene diisocyanate and trimethylolpropane. It is diluted with ethyl acetate to a solid...
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...
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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.