The latest development of adhesives and coatings m

2022-08-16
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The main function of label adhesive is to adhere the label to the surface of glass, plastic, metal containers or other products, which requires that the label and the pasted products are compatible. There are countless combinations among adhesives, label materials and application products, which will bring great technical challenges to processors. The same problem also occurs in label coating and priming. In addition to performance indicators, other issues have also attracted much attention, such as environmental impact. We have seen that the application of solvent based adhesives is gradually decreasing. In addition, we should pay attention to the migration of adhesive components on food packaging

for adhesives, water-based pressureless adhesives still account for the largest share, which is mainly due to the large number of wet adhesive labels used in the high-speed filling production line of cans and bottles. The rewetting adhesive is suitable for the production of adhesive label paper, which is also the original labeling form. This kind of adhesive is usually configured by natural resins, such as casein, starch and dextrin. These components will become sticky when dissolved or dispersed in water. With the evaporation or penetration of water. 1. When the horizontal tensile testing machine adopts imported hydraulic devices and servo control to label paper, it can produce strong adhesion. These adhesives are suitable for condensation, temperature fluctuations, refrigeration and other end markets

worldwide attention is paid to the recycling of packaging containers, which also urges bottlers to actively develop water washing technology to ensure that adhesives and labels can be thoroughly cleaned from recycled bottles. The current research includes looking for products to replace natural casein resin adhesives. For example, the optalxp recently launched by Henkel company does not contain casein adhesive, but uses higher strength resin. Henkel said that because the adhesive does not contain insoluble ingredients, and the problem of excessive foam has been effectively solved, it can meet the latest water washing technical requirements. It is said that it has longer shelf life, better viscosity and faster curing and drying performance of 1.2.1 air inlet equipped with digital air velocity anemometer

the popularity of label free appearance labeling of high-end beer usually has complex shapes, prompting composite processors/applicators to develop special water washing adhesives. The new adhesive developed by Allie Dennison can be easily cleaned out in a low-temperature bottle washer at 65 ℃. This adhesive can be combined with transparent double-layer PE film and pet backing paper to form a washable label, and can also be used in the bottle to bottle recycling system of pet, that is, PET bottles and PE labels are crushed together, and then the mixed fragments are immersed in hot lye. The difference in density can separate PE label material and pet fragments. In the process of recycling, the high-performance water washing adhesive can always adhere to the fragments of label materials, so as to ensure that PET materials are 100% recycled

fenolantai label company introduced a heat sensitive transparent acrylic adhesive rc7w, which is suitable for film labels that need to be cleaned during PET bottle to bottle recycling. The transparent or White PP surface material is washed out in the hot caustic solution, so that it can be separated from the PET bottle by gravity, and the remaining pure food grade PET material is used for bottle to bottle recycling. This non overflow adhesive has excellent performance in high-speed labeling, and can maintain high and lasting transparency even in wet environment

the latest development of pressure-sensitive adhesives

pressure-sensitive label adhesives are usually sticky, mainly including three types: permanent adhesives, semi permanent adhesives that need to be relocated after labeling, and removable adhesives. The controller is the core of the control system. Because the formula is mainly acrylic resin and solvent based rubber/resin solution, it can also be divided into solvent based adhesives, aqueous acrylic adhesives (also known as dispersive adhesives/latex adhesives) and permanent hot-melt adhesives. The formulation and performance of the adhesive can adapt to the pressure-sensitive labels from frozen product labels to secondary beating or composting

the main characteristics of adhesives using organic solvents are fast bonding performance, excellent heat resistance, chemical solvent resistance and UV resistance, which can adapt to various harsh environmental conditions. Previously, the excellent initial viscosity, final bonding strength and heat resistance of solvent based adhesives are unmatched by waterborne acrylic adhesives, ordinary rubber or hot melt adhesives. However, the main problem is that in order to meet today's increasingly stringent environmental regulations, solvents need to be recycled or incinerated

solvent based pressure-sensitive adhesives, especially those based on acrylic acid and vinyl acrylic resin, are mainly used in special fields with high performance requirements and no suitable alternative products. Michelletettamani of icap-sira, an Italian paint manufacturer, said that these fields include image production, industrial durability labeling, special tapes used in automobile and aerospace, and medical fields

waterborne acrylic adhesive can meet the requirements of most mainstream application fields. The peel strength and viscosity of this adhesive are not as good as solvent adhesive, but it has excellent die-cutting performance and UV resistance, and its shear strength at various temperatures can meet the needs of application. Shear strength represents the adhesive strength inside the adhesive, or the load capacity within a certain period of time. In addition, the water-based acrylic adhesive has low glue overflow and migration, which can reduce the risk of pollution when contacting food packaging labels

uv acrylic adhesive formula includes photoinitiator, which is a solvent-free adhesive suitable for durability labeling and industrial tapes. The radiation curing or crosslinking process of adhesives can improve their high temperature resistance and chemical solvent resistance, and have better peel strength and shear strength. Radiation curing is almost instantaneous drying, which can ensure faster coating speed and minimize the impact on heat sensitive materials

the main component of hot-melt pressure-sensitive adhesive is thermoplastic resin, which can be coated in the molten state and bonded once cooled. Its main advantages are high peel strength and viscosity, and high shear strength at room temperature. It is suitable for labeling deep frozen food in wet, dry and cold environment (water-based acrylic adhesive cannot achieve satisfactory results). The hot-melt adhesive is suitable for high-speed labeling, and the barely obvious adhesive trace makes the structural plate used in the dry state especially suitable for the labeling of glass containers. UV curing hot-melt adhesives are also suitable for harsh environments requiring permanent adhesives, and can be used as an alternative to solvent based adhesives

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