Which kind of coating is more developed in the field of packaging and printing
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From everyday applications to intelligence, coating technology seems to be omnipotent, providing many opportunities for packaging printers and product manufacturers to innovate. Water-based, solvent-based or UV-curable coatings can save costs for manufacturers and promote product sales – bringing lucrative profits to producers.
Several major coatings
In the field of packaging and printing, any coating technology can play a decisive role. INX International's main coatings are: water-based, solvent-based and energy-curing, but INV's national account manager Davant Davis is optimistic about water-based coatings. He believes that water-based coatings are the most promising, because based on some production practices, water-based coatings are often cheaper, less energy-intensive, environmentally friendly, and can achieve UV curing and re-solidification.
The ink packaging company also uses these three coating technologies. The company's technical consultant KentShah acknowledges that these technologies can bring a lot of convenience to packaging printing. Water-based inks can meet the increase of printing gloss, heat resistance and smoothness. Scratch resistance and other performance requirements. Water-based coatings are mainly used for porous, permeable substrates, and are not suitable for surface coating of relatively dense films and aluminum foil materials. However, by selecting a suitable resin, we can prepare both porous substrates (paper) and non-porous. Solvent-based coating of substrate (film, aluminum foil) material. The coating also provides additional benefits to the outer packaging: cold seals, water barriers, oil barriers and resistance to chemical attack.
For energy-curing coatings, Shah believes that although the market for UV-curable coatings is experiencing double-digit growth in recent years, it is odorous and toxic and cannot be applied to food packaging; in contrast, EB coatings It is more suitable for food packaging and its application is more and more extensive. At the same time, EB coatings are weather resistant, the coated packages are suitable for outdoor storage, and they can be applied to a variety of substrates.
NorthwestCoatings LLC is a manufacturer of water-based and UV/EB-curable coatings. Dr. Stephen Lapin, deputy general manager and technical director of the company, believes that both coatings are environmentally friendly and that they have fewer organic volatiles (VOCs). Oxidation furnaces are used to control the volatilization of coating organic chemicals, so water-based and UV/EB-cured coatings are safer to operate than solvent-based coatings.
Lapin said that in the past 30 years, the application of UV/EB coating technology in the packaging field has grown steadily, and now it is widely used in labels, multi-layer kraft paper bags, folding cartons, etc. However, he believes that it has the most development prospects. It is its application on flexible packaging. UV/EB curing coatings have only been used in a limited number of flexible packaging in the past, and now flexible packaging processors are looking for versatile UV/EB cured coatings that require high gloss, controlled coefficient of friction (COF), and coatings. It is expected to replace aluminum foil in composite packaging to reduce costs.
Todd Dick-enscheit, a chemical chemist, believes that UV-curable coatings have the advantage of being instantaneously curable and free of organic volatiles compared to solvent-based and water-based coatings, as well as better packaging protection than waterborne coatings.
Dickenscheit also predicts that UV-curable water-based new coatings are the most promising: it has relatively low organic volatiles and short drying times (relative to solvent-based coatings), while UV curing is expected to increase the durability of coatings. High-end product packaging, and the low cost of water as a solvent, so the future application of this coating will be more extensive.
Outlook
With the advent of the era of decorative packaging, coating technology will continue to increase the functionality of the outer packaging.
Shah said more and more specialty coatings are being used for barriers and food packaging. The laminating process has been replaced by EB-cured coatings, which have the advantage of low cost and fast delivery. Smart coatings can also be used for anti-counterfeiting.
Lapin introduces one of the most exciting developments – a UV/EB-curing water-based anti-caries coating that is highly effective in preventing the mites in multi-layer kraft bags and folding cartons. Insects often cause huge losses to the product, so this anti-mite coating technology has found its use in anti-mite packaging. Dichenscheitd and Shah also proposed the important application of nanotechnology in the future development of coatings. Dichenscheidt believes that nanotechnology is mainly used to develop smart coatings, while Shah believes that its application is multifaceted because of Siegwerk.
Lapin said that nanotechnology has developed rapidly. Although it has been used in coatings for many years, new nanomaterials are being continuously researched. The use of nanomaterials to prepare new coatings for packaging and packaging is a trend in coatings development.
Whether coating technology can add value to a product depends on the needs of customers. Dickenscheidt believes that any printer must decide what packaging their customers need, so that the coating can be fully functional when it is overwrapped.