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Five key points to keep in mind when using flexible packaging polyurethane laminating adhesives
Flexible packaging polyurethane laminating adhesives are the core materials for film laminating and flexible packaging production. The bonding effect directly affects the sealing, durability and safety of the packaging products. To avoid problems such as delamination, blistering and poor curing, and to ensure production quality and construction safety, the following five key points need to be paid special attention to when using them. 1. Strictly control the mixing ratio. This adhesive is...
The six key features of flexible packaging polyurethane laminating adhesives
Flexible packaging polyurethane laminating adhesives are the core materials for the composite processing of packaging in industries such as food, cosmetics, and medicine. With excellent comprehensive performance, they have become the mainstream bonding materials in the soft packaging industry. Their core features include six prominent aspects. 1. The bonding strength is high and the stability is good. It can firmly adhere to various flexible packaging substrates such as plastics and aluminum...
Analysis Of The Compressive Strength of Flexible Packaging Polyurethane Laminating Adhesives
The composite strength is the core indicator for evaluating the bonding performance of flexible packaging polyurethane laminating adhesives. It directly determines the inter-layer stability of the composite film and is the key to preventing packaging problems such as delamination, glue separation, and bulging. It is widely used in the production of flexible packaging in fields such as food, cosmetics, and medicine. The industry usually uses the T-type peel strength as the testing standard. The...
Techniques for Using Flexible Packaging Polyurethane Laminating Adhesives
The flexible packaging polyurethane laminating adhesive, with its strong bonding strength, excellent flexibility, and excellent heat resistance and weather resistance, is widely used in the laminating process of food and daily necessities flexible packaging. The proper usage techniques are crucial for preventing problems such as delamination, blistering, and wrinkling, and ensuring the quality of the packaging. Base material pre-treatment is the foundation for a strong bond. Before the...
Key points for controlling the coating amount of flexible packaging polyurethane laminating adhesive
The coating amount is the core parameter in the laminating adhesive compounding process of flexible packaging. It directly determines the bonding strength, appearance quality and durability of the packaged products, and is a key link in improving the quality and reducing the consumption of flexible packaging production. In the industry, the dry basis coating amount is used as the unified measurement standard. The setting of the coating amount is not a fixed value. It needs to be precisely...
Volatile Analysis Of Flexible Packaging Polyurethane Laminating Adhesive
The volatility of flexible packaging polyurethane laminating adhesives is a key indicator that affects the quality, production safety, and environmental compliance of packaging products. It is mainly manifested as the release of volatile organic compounds (VOCs) during the production curing process, directly impacting the safety of food packaging and the production environment in the workshop. Currently, the mainstream adhesives in the industry are divided into solvent-based, water-based, and...
Application Of Polyurethane Laminating Adhesive In Food Flexible Packaging
Food flexible packaging serves as an important carrier for food preservation and storage during transportation. With the upgrading of the food industry, multi-layer lamination flexible packaging has become the mainstream. Polyurethane laminating adhesives, due to their excellent comprehensive performance, have become the core material for the lamination processing of food flexible packaging, accounting for over 80% of the market share. Polyurethane laminating adhesive is suitable for various...
With the acceleration of the green transformation in the packaging industry, environmentally friendly polyurethane laminating adhesives for flexible packaging are gradually replacing traditional solvent-based adhesives and have become the core material for the production of flexible packaging for food, medicine, and daily necessities, aligning with the development trend of low-carbon and environmentally friendly industries. This adhesive is mainly divided into two categories: solvent-free...
Flexible packaging polyurethane laminating adhesives are the core materials for the production of food and daily necessities flexible packaging lamination. The adhesive's bonding stability directly determines the quality of the packaged products. Many people only focus on the application process but overlook the storage stage. In fact, proper storage conditions are the key to ensuring the performance of the adhesives and avoiding production losses. Their importance cannot be ignored. The...
Water-based flexible packaging polyurethane laminating adhesive is an environmentally friendly adhesive that uses water as the dispersion medium. It has abandoned the organic solvent system of traditional solvent-based adhesives. With advantages such as low VOC content, no odor, and safety and flame retardancy, it has become the core material for the green upgrade of the flexible packaging industry. It is widely used in the flexible packaging lamination fields of food, cosmetics, and...
Can the unused flexible packaging polyurethane laminating adhesive be reused?
Flexible packaging polyurethane laminating adhesives are commonly used materials in the lamination processing of food and daily necessities packaging. In many production scenarios, there will be leftover adhesive liquid. Many people wonder if such residual adhesive can be reused. In fact, this type of adhesive is not absolutely un-reusable, but it cannot be used for secondary purposes at will. It needs to be judged strictly based on the state of the adhesive liquid and the preservation method,...
The influence of air humidity on the polyurethane laminating adhesive for flexible packaging
The flexible packaging polyurethane laminating adhesive is highly sensitive to air humidity. Humidity is the core environmental factor that affects its curing reaction, bonding strength and product quality. It directly determines the construction effect and bonding stability. In industrial construction, it is necessary to strictly control the environmental humidity. The appropriate humidity is the optimal environment for the curing of polyurethane adhesives. Adequate moisture can assist in...
In the production of flexible packaging, BOPP, CPP, PE and other plastic substrates are commonly used materials for lamination processing. These substrates have strong chemical inertness, extremely low polarity and low surface tension. If polyurethane laminating adhesive is directly applied, the adhesive is difficult to evenly wet and spread, and cannot form a firm bond. This easily leads to problems such as lamination delamination, blistering, and insufficient peel strength. Therefore, before...
The hazards of incomplete curing of the flexible packaging polyurethane laminating adhesive
The flexible packaging polyurethane laminating adhesive forms a dense cross-linked structure through chemical reactions, thereby achieving bonding and sealing effects. However, if the curing process is incomplete after construction, it will cause a series of quality problems, significantly reducing the product quality and service life, and bringing numerous hidden dangers. The most direct consequence of incomplete curing is a significant reduction in bonding strength. The adhesive layer...
Can polyurethane laminating adhesive be used for packaging oily foods?
Polyurethane laminating adhesive can be used for packaging of oily foods, and it is currently the mainstream choice in the lamination process of food flexible packaging. It is widely applied in the production of packaging for oily foods such as fried snacks, nuts, meat products, and sauces. Compared with ordinary adhesives, polyurethane adhesive has excellent oil resistance, bonding strength and chemical stability. It can effectively resist the penetration and erosion of oil, avoiding problems...
The influence of solvents on the flexible packaging polyurethane laminating adhesive
Solvents are the core auxiliary components of the flexible packaging polyurethane laminating adhesive, directly influencing the coating performance of the adhesive, the curing effect, and the quality of the composite product. They are the key factors in controlling product quality in the dry lamination process of flexible packaging. Polyurethane laminating adhesives for flexible packaging are often used in combination with inert solvents such as ethyl acetate. The purity, evaporation rate, and...
Factors related to solvent residue after using flexible packaging polyurethane laminating adhesive
The residual solvents in flexible packaging are mainly influenced by several factors. Here are some common factors: 1.The Influence of Compound Speed Similar to the principle that printing speed affects the amount of solvent residue, the lamination speed is also a factor influencing the amount of solvent residue. Therefore, during production, the lamination speed should be reasonably set according to the drying capacity of the oven. 2. Influence of Laminating Adhesive Application...
The seven key functional features of flexible packaging polyurethane laminating adhesives
Flexible packaging polyurethane laminating adhesives are the core lamination materials in the fields of food, daily chemicals, and medicine packaging. With their unique molecular structure advantages, they possess seven core functional features, which are suitable for the efficient, safe, and durable production requirements of modern flexible packaging. 1. Excellent bonding performance, highly compatible with various flexible packaging substrates such as plastics and aluminum films. It has...
The media resistance of flexible packaging polyurethane laminating adhesives
Flexible packaging polyurethane laminating adhesives are the core materials for lamination film processing. Their resistance to various media directly determines the structural stability and service life of packaging products during storage and use, and are the key indicators for evaluating the comprehensive performance of adhesives. Flexible packaging often comes into contact with complex media such as oils, acids and bases, food ingredients, chemical auxiliaries, and electrolytes. It is prone...
Analysis of the Flash Point of Flexible Packaging Polyurethane Laminating Adhesive
Flash point is the core safety indicator for evaluating the flammable and explosive characteristics of flexible packaging polyurethane laminating adhesive. It is also an important basis for safety control during the production, storage, and coating application of the adhesive. It directly affects the safety production norms of the flexible packaging composite production line. The industry measures the flash point of adhesives according to the GB/T 30777 closed cup method, and in combination...
The application method of flexible packaging polyurethane laminating adhesives
Flexible packaging polyurethane laminating adhesives are the core materials for film lamination. The coating method directly determines the bonding uniformity, appearance quality and performance of the composite products. The mainstream coating methods in the industry include mesh roller coating, scraper coating and differential kiss coating, which are suitable for different production processes and product requirements. The screen roller coating method is the most commonly used technique in...
Curing of flxible packaging polyurethane laminating adhesive
The curing process of the flexible packaging polyurethane laminating adhesive is the core step in the lamination production process. Its essence is to achieve molecular cross-linking through chemical reactions, transforming the liquid adhesive layer into a high-strength and high-toughness solid adhesive film. This directly determines the bonding strength, temperature resistance and sealing performance of the flexible packaging composite film, and is widely used in lamination scenarios involving...
Why do the curing temperatures of flexible packaging polyurethane laminating adhesives vary?
Polyurethane laminating adhesives are the core bonding materials for dry and solvent-free laminating in flexible packaging. For different models and usage scenarios, the optimal curing and aging temperatures of these adhesives vary significantly. The conventional range covers 40℃ - 60℃, while special adhesives even require higher temperatures. This difference is mainly determined by four factors: the formulation system, the composite substrate, the product application, and the external...
Polyurethane laminating adhesive is the core supporting material for the lamination of flexible packaging films. Relying on the action of amine carbamate bonds and hydrogen bonds in the molecular chain, it can achieve high-strength composites of different substrates such as plastic films, aluminum foil, and paper, and is widely used in the flexible packaging fields of food, medicine, and daily chemicals. It is a key material for ensuring the stability of the interlayer composite 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.