Remove metal color for Toblerone open windows

    Kraft Food’s Tiny Toblerone uses a glittering, self-supporting bag that is individually packaged (see Figure 2). This packaging received another top achievement award and also received the Environmental Achievement Gold Award from Amcor Flexibles.

This product is aimed at duty-free shopping malls around the world. It uses DeMetXP's golden yellow metal film packaging, and Amcor has opened several high-transparent windows on the golden film to make the bags look grand. A self-supporting bag with a specification of 300 grams is made into a sealed bag with a pointed tip underneath. The bag is produced in Switzerland and is made of BOPP film with a thickness of 20 μm and a width of 200 mm.

The Belgian Amcor Transpac Halen removes the metal from the bag material and performs a six-color reversed gravure printing. DeMetXP technology is not only highly efficient, but also environmentally friendly, so it not only won the highest achievement award, but also won the gold medal of technological innovation, printing achievements and environmental achievements.

It took nearly two years to develop this technology. In the process of demetallization, the metal layer is not directly removed from the substrate, but a special demetallizing agent chemically reacts with the metal layer to form a transparent triangular window.

Guy Grossard, Production Manager of Amcor Flexibles Transpac, points out that the demetallization process is a very unique process. It not only shows that it can be operated online, but also “uses a special chemical reaction to remove the metal layer, enabling simultaneous printing and demetalling. Instead of being washed away, the metal layer is made transparent by effective control of the chemical reaction, and any problems that occur in the demetallization can be observed very intuitively, so that corrective measures can be taken."

Grossard pointed out that in the traditional demetallization process, it is usually required to add a protective layer in the area where the metal layer does not need to be removed, otherwise the area will be affected by the demetallization agent and the cold sealing process.

This is not the case in the DeMetXP process. Since Toblerone chocolate bars are triangular, this triangular window coincides with the trademark theme. An ingenious mix between the inner wrapper and the outer wrapper. A metallic golden background with a red and gold pattern. The bright red Toblerone logo pattern penetrates the front of the wrapper from the bottom to the top, creating a strong package visual impact.

The crisp bag is also a very stylish design. The four sides of the bag are printed with a pattern, sealed on four sides, and sealed on the back of the bag. Grossard pointed out that the DeMetXP process can produce film windows of different sizes and different styles. The newly developed demetallization process eliminates the wastewater treatment process, reduces waste, shortens the production cycle, and solves other problems associated with traditional demetallization processes.

Since the printing process is intuitively visible, the demetallization process can be monitored in real time. Grossard pointed out that Amcor's process uses special demetallizing agents, inks, and adhesion promoters to develop and optimize online production methods, which in turn favors the demetallization of the packaging process (molding/filling/sealing) despite This feature is not reflected in Toblerone small bags, but it is worth mentioning because it is a distinctive feature of this concept." He also pointed out that Amcor's goal is to expand the application of metal removal technology. Amcor also developed the corresponding printing technology and raw materials so that the bag material can be adapted to any bag making machine without any changes to the machine.

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