Jak zlepšit odolnost proti oděru a přilnavost UV laku Sushi Foldable Food Boxes?

Jak zlepšit odolnost proti oděru a přilnavost UV laku 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.

Za normálních okolností společnosti zabývající se tiskem barevných krabic často řeší tento problém výměnou skládacích krabic na potraviny Sushi UV lakem. Ve skutečnosti bychom neměli omezit své myšlení pouze na výměnu UV laku na skládací krabičky na jídlo Sushi, ale měli bychom své myšlení odklonit a převést své myšlení na změnu výrobního postupu barevných krabiček nebo úpravu příslušných parametrů procesu.

  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.

Nakonec jsme po opakovaných ověřeních objasnili myšlenku řešení tohoto problému: použít povrchový UV olej s vysokou odolností proti opotřebení pro zlepšení odolnosti proti opotřebení a zajistit přilnavost UV primeru úpravou parametrů procesu nebo změnou materiálů. Díky dvěma lakům je vrstva lakového filmu silnější, což zvyšuje odolnost proti oděru vysoce -otěru- odolného UV vrchního nátěru. Další krok se musí zaměřit pouze na vyřešení klíčových faktorů ovlivňujících přilnavost skládacích krabiček na jídlo sushi UV lak -tiskový inkoust a UV primer.

  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.

Shrnutí programu

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) Použijte vrchní UV olej s vysokou odolností proti oděru a mastný UV základ.

(3) Přidejte 10 až 20 procent rychleschnoucího- laku do inkoustu na kov (specifický poměr vychází z toho, že inkoust na kov je zcela zaschlý, prst je lehce poškrábaný na povrchu tištěného produktu a na prstu v podstatě není žádný kovový prášek. Barva se ředí a lze ji formulovat přidáním čtyř-barevných inkoustů). Je třeba zdůraznit, že UV základní nátěr musí být aplikován po úplném zaschnutí kovové barvy.

(4) Všechny rychle-schnoucí laky obsahují vysoušeče inkoustu. Pokud je kovový inkoust i po přidání rychle-schnoucích laků stále obtížně zasychavý, lze vhodně přidat sušidlo se stejnými schnoucími vlastnostmi jako bílý schnoucí olej (přidané množství menší nebo rovné 3 procentům), nepřidávejte červený schnoucí olej, protože červený schnoucí olej může pouze urychlit rychlost schnutí povrchu vrstvy inkoustu, ale nemůže urychlit rychlost schnutí vnitřku vrstvy inkoustu.

(5) V procesu po glazování musí být obsah vody v barevném boxu řízen pod 16 procent.

(6) Značky různých materiálů v cestě výrobního procesu by měly být pevně stanoveny a různé procesní parametry běžného tisku, procesu UV základního nátěru a UV vrchního laku by měly být udržovány stabilní a měly by být vedeny příslušné záznamy.

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