Which coating is more promising in the field of packaging and printing?

From everyday application to intelligence, coating technology seems to be omnipotent, and it provides many innovation opportunities for packaging printers and product manufacturers. Water-based, solvent-based or UV-curable coatings can save manufacturers costs and promote product sales-bringing huge profits to manufacturers.

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-curable, but INX's national account manager Davant Davis is optimistic about the coatings in which water is the solvent. He believes that water-based coatings have the most development prospects, because based on some production practice considerations, water-based coatings are often cheaper, consume less energy, are environmentally friendly, and can achieve UV curing and re-curing.

Siegwerk ink packaging company also focuses on these three coating technologies. The company's technical consultant KentShah admits that these technologies can bring a lot of convenience to packaging and printing. Water-based inks can meet the requirements of increasing printing gloss, heat resistance and lubricity , Scratch resistance and other performance requirements. Water-based coatings are mainly used for porous, air-permeable substrates, but not for the coating of denser films and aluminum foil materials. However, by choosing the appropriate resin, we can prepare both porous substrates (paper) and non-porous Solvent-based coating for substrate (film, aluminum foil) materials. This coating can also provide other effects for the outer packaging: cold seal, water resistance, oil resistance and resistance to chemical corrosion.

For energy-curable coatings, Shah believes that although the market for UV-curable coatings is experiencing double-digit growth in recent years, it cannot be applied to food outer packaging due to its odor and toxicity; by comparison, EB coatings It is more suitable for food packaging, and its application is more and more widely. At the same time, EB coating also has weather resistance, and the coated package is suitable for outdoor storage, and it can also be coated on various substrates.

NorthwestCoatingsLLC is a manufacturer of Itsuka water-based and UV / EB curing coatings. Dr. Stephen Lapin, the company's deputy general manager and technical director, believes that these two coatings are environmentally friendly, and they have fewer organic volatiles (VOCs) and do not need An oxidation furnace is used to control the volatilization of organic chemicals in the paint, so water-based and UV / EB cured paints are safer to operate than solvent-based paints.

Lapin said that in the past 30 years, the application of UV / EB coating technology in the packaging field has grown steadily. Today, it is widely used in labels, multi-layer kraft paper bags, folding cartons, etc. However, he believes that it has the most development prospects Is its application in flexible packaging. In the past, UV / EB cured coatings were only used in a limited number of flexible packaging. Now flexible packaging processors are looking for multifunctional UV / EB cured coatings, which require high gloss and a controllable coefficient of friction (COF). It is expected to replace aluminum foil in composite packaging to reduce costs.

UVitec pays great attention to the development of UV curing coatings. Todd Dick-enscheit, the company's chemical synthesizer, believes that compared with solvent-based and water-based coatings, UV-curable coatings have the advantage that they can be cured instantaneously without organic volatiles, and they have better external packaging protection than water-based coatings.

Dickenscheit also predicts that UV-curing water-based new coatings have the most development prospects: it has relatively few organic volatiles and short drying time (compared to solvent-based coatings), and UV curing will increase the durability of coatings. High-end product packaging, and the low cost of using water as a solvent, so this coating will be more widely used in the future.

Outlook

As the era of decorative packaging passes, coating technology will continue to increase the function of outer packaging.

Shah said that more and more special coatings are used in barriers and food packaging. The laminating process has been replaced by EB cured coatings. Its advantages are low cost and fast delivery. Smart coatings can also be used for anti-counterfeiting.

At NorthwestCoating, Lapin introduced one of the most exciting research and development achievements-a UV / EB cured water-based mothproof coating, which is very efficient in the mothproofing effect of multilayer kraft paper bags and folding cartons of. Insect worms often cause huge losses to the product, so this coating technology with anti-moth effect has found a place in the anti-moth 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 types of nanomaterials are constantly being researched. The use of nanomaterials to prepare new coatings for packaging and packaging is a trend in the development of coatings.

Whether paint technology can add value to a product depends on the needs of customers. Dickenscheidt believes that any printer must decide what kind of functional packaging their customers need, so that when the coating is applied to the outer packaging, it can fully exert its functions.

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