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In order to thoroughly implement the important instruction spirit of the practice on the construction of production workers, skill power and safety production, and solidly do a good job in the 23rd national "safety production Month" activities, Xinhui employees are guided to actively tree safety development concept, and constantly improve safety awareness and safety skills. Xinhui Company held the "Xinhui Chemical 2024 Safety Skills PK Competition" on the afternoon of June 29. The safety skills...
The weak initial adhesion is a typical problem in solvent-free lamination production. The viscosity of solvent-free adhesives is high at room temperature, and the process of solvent-free wetting and penetration occurs. The bonding strength of the film material immediately after the lamination is completed is extremely low, which easily leads to shifting, warping, wrinkling during winding, misalignment of the film layer, etc., seriously affecting the stability of subsequent cutting and...
In the production of flexible packaging lamination, both solvent-free and solvent-based polyurethane laminating adhesives have their own advantages and disadvantages. Simply comparing the unit prices cannot truly reflect the production costs. From the perspectives of comprehensive consumables, energy consumption, operation and maintenance, and environmental protection investment, the cost structures of the two types of adhesives are significantly different, directly affecting the overall profit...
In the production of flexible packaging color printing lamination, the compatibility between polyurethane laminating adhesives and printing inks is a key factor determining the appearance, adhesion, and weather resistance of the lamination products. Many abnormal phenomena such as white spots, blistering, delamination, ink migration, and blackening in the lamination are not due to individual quality issues of the adhesives or inks, but rather are caused by the incompatibility of the two...
Warping and curling of lamination films occur during the winding and aging of the films, which is a very common problem in flexible packaging processing. In many cases, it is closely related to the internal stress generated during the curing of polyurethane laminating adhesives, which can affect subsequent bag-making and cutting processes, and in severe cases, directly result in the destruction of the finished products. Polyurethane adhesives will undergo volume contraction during the...
High-solid-content polyurethane laminating adhesives are upgraded products from traditional solvent-based glues. The solid content generally reaches over 75%, compared to the conventional 50% solid content glues, they have significant advantages in terms of material cost, production efficiency and environmental protection indicators. They have now become the mainstream choice for dry lamination in medium and large-sized flexible packaging enterprises. The core feature is a high-concentration...
White spots, white fog, and mottling that occur during the lamination printing of films are common high-frequency appearance defects in color-printed flexible packaging, mainly concentrated in light-colored and solid-printed areas, which seriously affect the aesthetic appearance of the finished products. This problem is mostly related to the compatibility of the polyurethane laminating adhesive, the state of the printing ink, and the lamination processing environment, and is not merely a...
Curing is a key process for the cross-linking and formation of polyurethane laminating adhesives. Most flexible packaging factories adopt conventional 40℃ to 50℃ constant temperature curing, while the low-temperature curing process, with its advantages of energy saving and prevention of film material deformation, has gradually been applied to thin material and stretchable flexible packaging production. Low-temperature curing refers to the completion of glue cross-linking in an environment of...
Odor Source and Control Scheme of Flexible Packaging Polyurethane Laminating Adhesive
Packaging odor is a common complaint issue for flexible packaging products. Most of the odors come from the residual substances and by-product products of the polyurethane laminating adhesive system. Food, baby care, and daily care packaging have extremely high requirements for odor. Even a slight odor can lead to product downgrade and return. Therefore, accurately controlling the odor of the adhesive is a key link in the quality control of flexible packaging. Polyurethane adhesive odors can...
The two-component flexible packaging polyurethane laminating adhesives have a fixed shelf life, also known as the operable time, which is a key process parameter that is easily overlooked in lamination production. After the main agent and curing agent are mixed, a continuous cross-linking reaction occurs, and the viscosity of the adhesive solution will continuously increase over time. Once the applicable period is exceeded, the adhesive performance will significantly deteriorate, directly...
Oleophobic erosion is the main cause of the delamination and detachment of flexible-packed cooked foods, fried foods, and sauce products. When ordinary polyurethane adhesives are in prolonged contact with edible oils, vegetable oils, and oil-based seasonings, the oil molecules will gradually penetrate the adhesive layer, causing the gel structure to swell and soften, thereby damaging the bonding interface of the substrate. Eventually, this leads to blistering of the laminated film, a sharp...
The flexible packaging two-component polyurethane laminating adhesive consists of a main agent and a curing agent. Precise ratio matching is the foundation for the normal cross-linking and stable formation of the adhesive layer. In production, imbalanced ratios are common latent problems. Even a slight deviation from the standard ratio can lead to a series of lamination quality defects, and most of these defects will only be exposed after curing or during the storage period of the finished...
The aging resistance of the flexible packaging polyurethane laminating adhesive directly determines the long-term storage stability of the composite packaging. During the storage, transportation and end-use processes of flexible packaging, it will continuously be exposed to light, high temperature, oxygen, moisture and oil erosion. If the adhesive has insufficient aging resistance, problems such as yellowing, delamination, blistering, and attenuation of peel strength due to aging failure are...
Bubbles are a common appearance defect in the production of solvent-free polyurethane adhesive lamination. They can directly cause problems such as voids in the laminated film, decreased peel strength, and uneven light transmission, seriously affecting the qualification rate of flexible packaging products. Unlike solvent-based adhesives, the solvent-free system has no solvent evaporation channels. Once bubbles form, they are difficult to eliminate on their own, so the early process control is...
Key points for controlling solvent residues in flexible packaging polyurethane laminating adhesives
Solvent residue is a key indicator for the quality inspection of food flexible packaging, directly affecting the safety of the packaging and the odor quality. The solvent-based flexible packaging polyurethane laminating adhesive uses ethyl acetate as the diluent. If the drying and coating processes are not properly controlled, the residual solvents will remain inside the adhesive layer, causing packaging odors, contaminating the contents, and even triggering food safety inspection...
Peeling and insufficient peeling force are the most common quality problems in the production of flexibe packaging lamination. Most of these issues are closely related to the selection of polyurethane laminating adhesives, coating processes, and substrate conditions. The polyurethane laminating adhesives used in flexible packaging rely on cross-linking bonding to achieve the composite of multiple layers of films. Any improper control at any stage will lead to defects such as delamination,...
The steaming and boiling type polyurethane laminating adhesive is a special lamination raw material for high-temperature sterilization food packaging. Relying on the high-crosslinking polyester molecular structure, it can withstand boiling and steaming processes at temperatures above 121℃, and is widely used in the lamination of packaging bags for meat marinated products, pre-prepared foods, and high-temperature sterilization snacks. This type of adhesive is made by combining high-functional...
Water-based flexible packaging polyurethane laminating adhesive is an environmentally friendly adhesive that uses water as the dispersion medium and does not contain organic solvents. It is a core green material that replaces traditional solvent-based adhesives. Compared with solvent-free and solvent-based polyurethane adhesives, the greatest advantage of this product is its low VOC content and no risk of flammability or explosion. It completely solves the safety and environmental protection...
Solvent-free polyurethane laminating adhesives are the core material for the green upgrade of flexible packaging. They eliminate the use of large amounts of organic solvents in traditional solvent-based adhesives, meeting the dual development requirements of environmental protection and safe production in the packaging industry. They have now been widely applied in the production of snack, frozen food, and seasoning composite films. The traditional solvent-based glue production process...
Flexible packaging polyurethane laminating adhesives are the core auxiliary materials for the production of flexible laminated packaging in industries such as food, cosmetics, and medicine. With excellent adhesion, flexibility, and weather resistance, they have become the preferred adhesive products for laminating various substrates such as films, aluminum foil, and paper. In the industry, based on the raw material structure and system characteristics, they are mainly divided into two...
The Influence Of Temperature On Flexible Packaging Polyurethane Laminting Adhesives
Polyurethane laminating adhesives are the core material in the production of flexible packaging lamination. Temperature, as a crucial environmental and process parameter, directly affects the curing reaction of the adhesives, the coating effect, and the quality of the laminated products. It is an important factor in controlling the yield rate of flexible packaging production. Excessive low temperature will significantly inhibit the molecular movement of the adhesive, slow down the...
Factors Affecting Flexible Packaging Polyurethane Lminating Adhesives
Polyurethane laminating adhesives are the core materials in the production of flexible packaging lamination. Their bonding strength, curing effect, and product stability are influenced by multiple factors, directly determining the lamination quality and service life of flexible packaging products. The key influencing factors mainly lie in the formulation, environment, substrate, and construction process. The formulation ratio of the adhesive itself is the fundamental key. The ratio of the...
In the production of flexible packaging lamination, most people focus on the coating amount, ratio and initial adhesion effect of polyurethane laminating adhesives, but often overlook the core role of the curing process. In fact, the curing of flexible packaging polyurethane laminating adhesives is a crucial step that determines the quality of the laminating products, and directly affects the performance and service life of the packaging. The curing process of polyurethane laminating...
Analysis Of The Aging Resistance Of Flexible Packaging Polyurethane Laminating Adhesives
Flexible packaging polyurethane laminating adhesives are the core materials for the lamination of food, daily chemical, and pharmaceutical flexible packaging. Their aging resistance directly determines the service life and safety of the packaging products, and is also a key indicator for evaluating the bonding quality. In general, high-quality two-component polyurethane flexible packaging adhesives possess excellent comprehensive aging resistance and can be adapted to most normal temperature,...
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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.