Como melhorar a resistência à abrasão e a adesão do verniz UV Sushi Foldable Food Boxes?

Como melhorar a resistência à abrasão e a adesão do verniz UV Sushi Foldable Food Boxes?

UV glazing is a common surface finishing process in the packaging and printing industry. Color box printing enterprises (especially those with export business in Japan, Europe and the United States and other countries and regions) often encounter such problems: after Sushi Foldable Food Boxes UV varnish ing the printed product, the wear resistance of the Sushi Foldable Food Boxes UV varnish  film layer and the Poor adhesion, especially when the print is printed with metallic ink (gold or silver) and then Sushi Foldable Food Boxes UV varnish ed.

Em circunstâncias normais, as empresas de impressão de caixas coloridas geralmente resolvem esse problema substituindo o verniz UV do Sushi Foldable Food Boxes. Na verdade, não devemos apenas limitar nosso pensamento a substituir o verniz UV do Sushi Foldable Food Boxes, mas devemos divergir nosso pensamento e converter nosso pensamento para mudar a rota do processo de produção das caixas de cores ou ajustar os parâmetros relevantes do processo.

  Solutions

The conventional production process route of corrugated color box is: plate making and paper cutting→normal printing→UV primer→UV surface oil→corrugated mounting→die cutting→gluing box. After many tests, the author summarizes the methods for improving the production process of corrugated boxes as follows.

(1) Plate making and paper cutting → UV ink printing plus online Sushi Foldable Food Boxes UV varnish ing. Tests have shown that this production process can greatly improve the abrasion resistance and adhesion of Sushi Foldable Food Boxes UV varnish  on metal UV inks, but metal UV inks are relatively rare in the market, require special customization, are expensive, and must be printed with UV printing press. In general, most of the small color box printing enterprises do not have UV printing machines, so this production process is only suitable for some color box printing enterprises, and the general promotion is of little significance.

(2) Plate making and paper cutting → ordinary printing → screen printing Sushi Foldable Food Boxes UV varnish ing. This production process can also solve the problems of poor wear resistance and adhesion of Sushi Foldable Food Boxes UV varnish  on metal inks, but the cost of screen printing Sushi Foldable Food Boxes UV varnish  is higher, and the environmental protection performance is not as good as that of water-based Sushi Foldable Food Boxes UV varnish . In addition, many color box printing enterprises do not have automatic screen printing machines, but only semi-automatic screen printing machines with low production efficiency. Therefore, this production process can only be applied to some color box printing enterprises, and is not worthy of general promotion.

Finalmente, após repetidas verificações, esclarecemos a ideia de resolver este problema: usar óleo de superfície UV de alta resistência ao desgaste para melhorar a resistência ao desgaste e garantir a adesão do primer UV ajustando os parâmetros do processo ou alterando os materiais. Devido a dois vernizes, a camada de filme de verniz é mais espessa, o que torna mais segura a resistência à abrasão do acabamento UV de alta-abrasão-resistente. A próxima etapa só precisa se concentrar em resolver os principais fatores que afetam a adesão do verniz UV Sushi Foldable Food Boxes -tinta de impressão e primer UV.

  solution

Before solving the problem, you first need to understand the customer's requirements and testing methods for color boxes.

(1) To test the wear resistance of Sushi Foldable Food Boxes UV varnish  on color boxes, the methods are as follows: ① If the color boxes need to be shipped by sea, a box of actual products can be packed in the cardboard box used in the actual customs declaration, or a box with the same weight and specifications as the actual products can be packed. The product model is placed on a simulated transportation test machine (vibration test bench) and vibrated for more than 2 hours. It is qualified if there is no obvious Sushi Foldable Food Boxes UV varnish  film or ink layer on the surface of the color box; ② Put the color box sample on the friction tester On, use a 22N weight to wipe back and forth 80 times (the weight and times can be determined according to the customer's requirements), if there is no obvious Sushi Foldable Food Boxes UV varnish  or ink drop, it is qualified.

(2) Detect the adhesion of the Sushi Foldable Food Boxes UV varnish  on the color box, the method is as follows: ①Affix the 3M transparent tape firmly on the surface of the color box, and then tear off the tape rapidly and forcefully at a 45-degree angle to prevent the Sushi Foldable Food Boxes UV varnish  film from sticking. The layer or ink layer is qualified; ②Use HB pencil lead to scribble back and forth on the surface of the Sushi Foldable Food Boxes UV varnish  film layer of the color box, and it is qualified if the Sushi Foldable Food Boxes UV varnish  layer or ink layer is not scratched.

There are two main structures of silver powder contained in silver ink currently on the market: one is a granular structure close to a circle; the other is a flaky structure similar to "fish scales". The former is more conducive to the adsorption of UV primer, and the latter can better show the metallic luster and texture of the ink. However, there is only one structure of gold powder contained in the gold ink currently on the market: a flaky structure similar to "fish scales". Therefore, the adhesion of UV primer on gold ink is much worse than that on silver ink, and it is more troublesome to solve. The author also learned that the adhesion of oil-based UV primers on metal inks is better than that of water-based UV primers. However, oil-based UV primers are also used in the improved process, but their adhesion problem on metallic inks has not been resolved, so we have to shift our focus to the improvement of metallic inks.

When testing the adhesion of the Sushi Foldable Food Boxes UV varnish  on the problematic color box, we found that not only the Sushi Foldable Food Boxes UV varnish  film but also a part of the ink layer was sticked off by the 3M transparent tape. In addition, we also found that after the normal printing process was completed and the metal ink was completely dry, a thin layer of metal powder was left on the finger when lightly swiped across the surface of the print. From this we judge: it may be that the binder in the metal ink is not enough. So we added some transparent inks to the metallic inks. After testing again, we found that the adhesion of the UV primer on the metallic inks was significantly improved, but it still failed to meet the customer's requirements. In this regard, we replaced the added transparent ink with quick-drying varnish, so that the adhesion problem of UV primer on metal ink was basically solved. However, the addition of quick-drying varnish dilutes the color of the metallic ink, resulting in a slight change in the color of the printed product, so it is necessary to add a little four-color ink to the metallic ink for redeployment. In addition, in the three processes after Sushi Foldable Food Boxes UV varnish ing, mainly the water content of the color box will affect the abrasion resistance of Sushi Foldable Food Boxes UV varnish , so it needs to be controlled to a certain extent.

Resumo do programa

Finally, the author summarizes the technical points of the abrasion resistance and adhesion of Sushi Foldable Food Boxes UV varnish  on metal ink as follows.

(1) Production process route: plate making and paper cutting → ordinary printing → UV primer → UV finish.

(2) Use óleo superior UV de alta resistência à abrasão e primer UV oleoso.

(3) Adicione de 10% a 20% de verniz de secagem-rápida à tinta metálica (a proporção específica é baseada no fato de a tinta metálica estar completamente seca, o dedo estiver levemente arranhado na superfície do produto impresso e basicamente não há pó de metal no dedo. A cor é diluída e pode ser formulada adicionando quatro-tintas coloridas). Ressalta-se que o primer UV deve ser aplicado após a tinta metálica estar completamente seca.

(4) Todos os vernizes de secagem rápida- contêm secadores de tinta. Se a tinta metálica ainda estiver difícil de secar após a adição de vernizes- de secagem rápida, um secador com as mesmas propriedades de secagem do óleo secante branco pode ser adicionado adequadamente (quantidade de adição menor ou igual a 3 por cento), não adicione óleo de secagem vermelho, porque o óleo de secagem vermelho só pode acelerar a velocidade de secagem da superfície da camada de tinta, mas não pode acelerar a velocidade de secagem do interior da camada de tinta.

(5) No processo após a vidragem, o teor de água da caixa de cor deve ser controlado abaixo de 16 por cento.

(6) As marcas de vários materiais na rota do processo de produção devem ser fixadas e os vários parâmetros de processo de impressão comum, primer UV e processos de acabamento UV devem ser mantidos estáveis ​​e registros relevantes devem ser mantidos.

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