Tingsheng will provide the best Kraft Paper Lunch Box, Kraft Bread Box, Kraft Paper Pizza Box
Kraft paper printing can use flexo printing, gravure printing, offset printing and screen printing processes. As long as you master the essentials of printing technology, are familiar with the printing suitability of printing ink and kraft paper, select and allocate ink reasonably, and control equipment parameters, you can get the best quality results. .
However, for some small packaging and printing factories, or small factories that have just put into production and operation of kraft paper packaging, there will still be some problems in product quality due to various conditions. The following are some points that need to be paid attention to in the printing of kraft paper:
Pay attention to printing colors
In order to obtain better color reproduction in kraft paper printing, it is more difficult than printing with SBS paper. In particular, accurate color reproduction on regular kraft board requires more care than printing on bleached kraft board. Since ordinary kraft paper itself is dark brown, the effect of printing ink is very different from that of printing on bleached paper. Therefore, it is best to use brightly colored inks and use more eye-catching colors, so that the printing effect is better. Pastel colors and tints are the most difficult to achieve the desired effects of ink density, opacity, and abrasion resistance. Also, if necessary, adding a little white to the ink first will help to achieve the desired pastel or tint, which is very useful for replicating pastel and pastel colors. With the increasing maturity of printing technology, some manufacturers even use UV ink to effectively improve the printing color effect. At present, almost all ink manufacturers have developed inks for primary color board, and many ink manufacturers have also developed inks for printing on kraft paper. Therefore, before determining the best solution for the work, you should consult the ink manufacturer, choose different formula inks according to the printing needs of the factory, refer to the ink color spectrum provided by the ink manufacturer and the printing effect of the ink on different papers, and finally determine the most suitable one for yourself. Best ink.
Reasonable selection of ink
Since kraft paper is different from SBS cardboard and general printing paper, it is uncoated, looser than bleached cardboard, has many pores on the surface, and has relatively strong permeability, etc., which needs to be comprehensively applied in ink application and coating. consider. For example, according to the analysis of the characteristics of kraft paper, it is generally better to use flexographic printing, and it is not suitable to use an offset printing machine for full-page solid kraft paper printing. Due to the rough surface of kraft paper, soft texture, strong ink absorption, dull color of printed products, and the phenomenon of ink pulling off paper surface fibers (also known as pulling off paper wool) during printing.
Cardboard production and processing
Due to the loose, porous and bulky characteristics of unglazed kraft paper, it is easy to generate dust during the production and processing of cardboard. Therefore, attention should be paid to preventing and reducing the harm caused by dust.
Post-press die-cutting
Due to the special structure of primary color kraft paper, its strength is large and its fiber characteristics are predictable, so it has better processing properties such as embossing, die-cutting and die-engraving. But for high-strength and tough primary fibers, kraft paper is required to pass deep indentation lines to avoid rebound. In addition, the die-cutting knives are required to be sharp. Due to the higher fiber strength of kraft paper, a narrower indentation is also required on the perforation line, and the nicks required for perforation should be fewer and smaller.
Gluing and reasonable bonding
High-solid, high-viscosity resin adhesive is suitable for low-temperature bonding. It needs to be cooled before it can be attached to kraft cardboard, and cannot penetrate into the cardboard in large quantities. Traditional hot melt adhesives are also suitable for kraft cardboard and polyester-glazed kraft paper. The effect is relatively it is good. Due to its light weight, kraft paperboard is suitable for production on high-speed folder-folder machines.
Reasonable selection of paper
In order to meet the new packaging needs of food manufacturers, unbleached kraft paperboard has some characteristics different from bleached paperboard, such as baked goods or household products such as convenience food. The natural brown look of primary kraft paper has a healthy, retro look. In fact, just the contrast between the unique appearance of the kraft paper and the large amount of white packaging can make the product stand out. Since many food packaging is designed for convenience or practicality, the strength of kraft paper is another advantage. Takeaway packaging must be strong enough to enclose the customer’s meal without breaking it. By the same token, beverage cups must be able to hold up in a humid environment so that the coffee doesn’t run down the customer’s lap. Strength is also a major consideration for frozen foods because the packaging of frozen foods cannot deform, tear, distort, or absorb too much moisture during the freeze/thaw cycle. In terms of practicality in this regard, kraft paper is better than homogeneous bleached kraft paper.
Post time: Jul-28-2022