Yuav ua li cas txhawm rau txhim kho kev puas tsuaj thiab adhesion ntawm Sushi Foldable Food Boxes UV kua roj vanish?

Yuav ua li cas txhawm rau txhim kho kev puas tsuaj thiab adhesion ntawm Sushi Foldable Food Boxes UV kua roj vanish?

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.

Raws li ib txwm muaj, cov tuam txhab luam ntawv lub thawv xim feem ntau daws qhov teeb meem no los ntawm kev hloov Sushi Foldable Food Boxes UV kua roj vanish. Qhov tseeb, peb yuav tsum tsis tsuas yog txwv peb txoj kev xav los hloov Sushi Foldable Food Boxes UV kua roj vanish, tab sis yuav tsum diverge peb txoj kev xav thiab hloov peb txoj kev xav los hloov cov txheej txheem ntau lawm ntawm cov thawv xim los yog kho cov txheej txheem cuam tshuam.

  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.

Thaum kawg, tom qab rov txheeb xyuas dua, peb tau qhia meej lub tswv yim ntawm kev daws qhov teeb meem no: siv cov roj hnyav hnyav UV ua kom zoo dua qub, thiab xyuas kom cov adhesion ntawm UV primer los ntawm kev kho cov txheej txheem los yog hloov cov ntaub ntawv. Vim yog ob lub varnishes, cov kua roj vanish txheej yog thicker, uas ua rau cov abrasion tsis kam ntawm siab - abrasion - tiv thaiv UV topcoat ntau ruaj ntseg. Cov kauj ruam tom ntej tsuas yog yuav tsum tau tsom mus rau kev daws cov teeb meem tseem ceeb uas cuam tshuam rau qhov adhesion ntawm Sushi Foldable Food Boxes UV kua roj vanish - luam ntawv number case thiab 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.

Cov ntsiab lus ntawm txoj haujlwm

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) Siv lub siab ua haujlwm UV sab saum toj roj thiab oily UV primer.

(3) Ntxiv 10 feem pua ​​​​rau 20 feem pua ​​​​ntawm kev ceev- ziab cov kua roj vanish rau cov hlau number case (qhov tshwj xeeb piv yog raws li tus number case hlau tau qhuav tag, tus ntiv tes yog me ntsis khawb rau saum npoo ntawm cov khoom luam tawm, thiab Cov xim yog diluted thiab tuaj yeem tsim los ntawm kev ntxiv plaub -xim inks). Nws yuav tsum tau hais tias UV primer yuav tsum tau siv tom qab cov hlau number case qhuav tag.

(4) Quick- ziab cov kua roj vanish tag nrho muaj cov tshuab ziab khaub ncaws. Yog hais tias tus number case hlau tseem nyuaj kom qhuav tom qab ntxiv ceev- ziab cov kua roj vanish, lub tshuab ziab khaub ncaws nrog cov khoom kom qhuav zoo ib yam li cov roj ziab kom qhuav tuaj yeem tsim nyog ntxiv (ntxiv cov nyiaj tsawg dua lossis sib npaug li 3 feem pua), tsis txhob ntxiv cov roj qhuav qhuav, vim tias cov roj qhuav qhuav tuaj yeem ua kom cov roj ziab kom qhuav sai ntawm qhov chaw ntawm txheej number case, tab sis tsis tuaj yeem ua kom qhuav ceev ntawm sab hauv txheej number case.

(5) Hauv cov txheej txheem tom qab glazing, cov dej ntsiab lus ntawm lub thawv xim yuav tsum tau tswj qis dua 16 feem pua.

(6) Cov hom ntawm ntau yam ntaub ntawv nyob rau hauv cov txheej txheem ntau lawm yuav tsum tau kho, thiab ntau yam txheej txheem tsis zoo tib yam luam ntawv, UV primer, thiab UV topcoat txheej txheem yuav tsum tau ruaj khov, thiab cov ntaub ntawv tseem ceeb yuav tsum tau khaws cia.

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