Rengo Co., Ltd., Japan’s largest Good printability on antiviral coated liner. Printed area also shows antiviral effect.require anti-virus measures, which may come into direct contact with an unspecified number of people” (Yoshi-hito Fujimoto, Packaging Materials Re-search Department, Central Research Institute).Copper compounds are used as antiviral agents. Silver and titanium are also applicable as antiviral agents, but why choose copper. Mr. Fujimoto an-swers, “It was the best choice from the production and cost standpoints.”The antiviral properties of corrugat-ed board are achieved by pre-coating the liner surface with a water-based coating agent containing copper com-pound that the company developed. The advantage of the precoating is that the entire surface of the liner can be coated. Noboru Ito of the Packaging Division’s Development Department explains, “When coating corrugated board sheets, flexo printing is used. However, since it is a sheet, the sur-face is uneven and the surface is not smooth, resulting in ar-eas that are dif-to print, ficult such as the edges. In con-trast, roll-to-roll precoating on the liner has a smooth surface and can be applied to the entire sur-face in a clean manner.” Although this method is more expensive than gener-al corrugated board, “We decided to use precoating from the quality view-point. We are also looking into ways to lower the cost, but it already is much inexpensive compared to antiviral var-nish from ink manufacturers. Howev-er, compared to ordinary corrugated board, the price is set high. We hope to target buyers who can see through Antiviral corrugated cardboard “VIRUS REN GUARD”Yoshihito Fujimo-to, Packaging Ma-terials Research Department, Central Research Laboratory20corrugated board manufac-turer, has launched virus-resistant corrugated packaging “VIRUS REN GUARD” in response to the rising demands for anti-virus mea-sures in May of this year. VIRUS REN GUARD is a corrugated box made from linerboard coated with virus-resistant copper compounds which has been verified to reduce viruses on the surface by 99% in 24 hours. The antiviral effect has also been confirmed in areas other than the prints, and the company is planning for application other than packaging, such as assembled products.Precoating the corrugated boxes up to the edges The “antiviral-processed” and “anti-microbial-processed” labels found in public facilities, transportation facili-ties, and stores in Japan are an indi-cation of the demand that has risen in association with the global coronavirus pandemic. On the other hand, there is a history of viral pandemic in the past such as the SARS coronavirus and the new influenza virus, indicating the in-extricable relation of virus to people. Under such circumstance, Rengo de-veloped VIRUS REN GUARD based on the idea that “corrugated boxes also
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