Kif ittejjeb ir-reżistenza għall-brix u l-adeżjoni tal-verniċ UV tal-Kaxxi tal-Ikel li jintwew tas-Sushi?

Kif ittejjeb ir-reżistenza għall-brix u l-adeżjoni tal-verniċ UV tal-Kaxxi tal-Ikel li jintwew tas-Sushi?

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.

Taħt ċirkostanzi normali, il-kumpaniji tal-istampar tal-kaxxa tal-kulur ħafna drabi jsolvu din il-problema billi jissostitwixxu l-verniċ UV tal-Kaxxi tal-Ikel li jintwew tas-Sushi. Fil-fatt, m'għandniex nillimitaw il-ħsieb tagħna biss biex nissostitwixxu l-verniċ UV tal-Kaxxi tal-Ikel li jintwew tas-Sushi, iżda għandna niddiverġjaw il-ħsieb tagħna u nikkonvertiw il-ħsieb tagħna biex nibdlu r-rotta tal-proċess tal-produzzjoni tal-kaxxi tal-kulur jew naġġustaw il-parametri rilevanti tal-proċess.

  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.

Fl-aħħarnett, wara verifiki ripetuti, iċċaraw l-idea li ssolvi din il-problema: uża żejt tal-wiċċ UV b'reżistenza għolja għall-ilbies biex ittejjeb ir-reżistenza għall-ilbies, u tiżgura l-adeżjoni tal-primer UV billi taġġusta l-parametri tal-proċess jew tbiddel il-materjali. Minħabba żewġ verniċ, is-saff tal-film tal-verniċ huwa eħxen, li jagħmel ir-reżistenza għall-brix tal-topcoat UV reżistenti għoli-brix-aktar sigura. Il-pass li jmiss jeħtieġ biss li jiffoka fuq is-soluzzjoni tal-fatturi ewlenin li jaffettwaw l-adeżjoni ta 'Sushi Foldable Food Boxes UV verniċ -linka tal-istampar u 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.

Sommarju tal-programm

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) Uża żejt ta 'fuq UV ta' reżistenza għolja għall-brix u primer UV żejtni.

(3) Żid 10 fil-mija sa 20 fil-mija ta' verniċ ta' tnixxif ta' malajr-mal-linka tal-metall (il-proporzjon speċifiku huwa bbażat fuq li l-linka tal-metall tkun kompletament imnixxfa, is-saba' jkun scratched ħafif fuq il-wiċċ tal-prodott stampat, u Bażikament m'hemm l-ebda trab tal-metall fuq is-saba'. Il-kulur huwa dilwit u jista 'jiġi fformulat billi żżid erba' -linka tal-kulur). Għandu jiġi enfasizzat li l-primer UV għandu jiġi applikat wara li l-linka tal-metall tkun kompletament niexfa.

(4) Il-verniċ tat-tnixxif ta' malajr-kollha fihom apparat li jnixxef il-linka. Jekk il-linka tal-metall għadha diffiċli biex tinxef wara li żżid-verniċ ta' tnixxif malajr, jista' jiġi miżjud b'mod xieraq drier bl-istess proprjetajiet ta' tnixxif bħaż-żejt abjad tat-tnixxif (ammont addizzjonali Inqas minn jew ugwali għal 3 fil-mija), iżżidx żejt tat-tnixxif aħmar, minħabba li ż-żejt tat-tnixxif aħmar jista 'biss iħaffef il-veloċità tat-tnixxif tal-wiċċ tas-saff tal-linka, iżda ma jistax iħaffef il-veloċità tat-tnixxif ta' ġewwa tas-saff tal-linka.

(5) Fil-proċess wara l-glazing, il-kontenut tal-ilma tal-kaxxa tal-kulur għandu jiġi kkontrollat ​​taħt is-16 fil-mija.

(6) Il-marki ta 'diversi materjali fir-rotta tal-proċess tal-produzzjoni għandhom jiġu ffissati, u l-parametri varji tal-proċess tal-istampar ordinarju, UV primer, u UV topcoat proċessi għandhom jinżammu stabbli, u għandhom jinżammu rekords rilevanti.

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