Hvordan forbedre slitestyrken og vedheften til Sushi Foldable Food Boxes UV-lakk?

Hvordan forbedre slitestyrken og vedheften til Sushi Foldable Food Boxes UV-lakk?

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.

Under normale omstendigheter løser fargebokstrykkerier ofte dette problemet ved å erstatte Sushi Foldable Food Boxes UV-lakk. Faktisk bør vi ikke bare begrense tanken vår til å erstatte Sushi Foldable Food Boxes UV-lakk, men bør divergere vår tenkning og konvertere vår tenkning til å endre produksjonsprosessen til fargebokser eller justere relevante prosessparametere.

  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.

Til slutt, etter gjentatte verifikasjoner, har vi klargjort ideen om å løse dette problemet: bruk UV-overflateolje med høy slitestyrke for å forbedre slitestyrken, og sikre vedheft av UV-primer ved å justere prosessparametere eller endre materialer. På grunn av to lakker er lakkfilmlaget tykkere, noe som gjør slitestyrken til det høy-slitebestandige-UV-toppbelegget sikrere. Det neste trinnet trenger bare å fokusere på å løse nøkkelfaktorene som påvirker vedheften til Sushi Foldable Food Boxes UV-lakk -trykkblekk og 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.

Programsammendrag

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) Bruk høy slitestyrke UV-toppolje og oljeaktig UV-primer.

(3) Tilsett 10 prosent til 20 prosent hurtig-tørkende lakk til metallblekk (det spesifikke forholdet er basert på at metallblekk er fullstendig tørket, fingeren er lett ripet på overflaten av det trykte produktet, og det er i utgangspunktet ikke noe metallpulver på fingeren. Fargen er fortynnet og kan formuleres ved å tilsette fire-fargeblekk). Det skal understrekes at UV-primeren må påføres etter at metallblekk er helt tørt.

(4) Hurtig-tørkende lakker inneholder alle blekktørkere. Hvis metallblekk fortsatt er vanskelig å tørke etter tilsetning av hurtig-tørkende lakk, kan en tørketrommel med samme tørkeegenskaper som hvit tørkeolje tilsettes (tilsetningsmengde mindre enn eller lik 3 prosent), ikke tilsett rød tørkeolje, fordi rød tørkeolje bare kan øke hastigheten på tørkehastigheten til overflaten av blekklaget, men ikke øke hastigheten på tørkehastigheten på innsiden av blekklaget.

(5) I prosessen etter innglassing skal vanninnholdet i fargeboksen kontrolleres under 16 prosent.

(6) Merkene til ulike materialer i produksjonsprosessen bør fastsettes, og de ulike prosessparametrene for vanlig utskrift, UV-grunning og UV-toppbelegg-prosesser bør holdes stabile, og relevante registreringer bør føres.

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