The importance of fine packaging appearance

　 Corrugated boxes are generally pre-printed with a face sheet. Then it is laminated with corrugated board.

　　The printing methods for the face paper are offset, flexographic and gravure printing. Packaging design, offset printing face paper dot rich level, strong color, good quality, very suitable for short version of the work and flexible personalized market demand. Flexographic printing mostly uses water-based environmentally friendly ink, with the advantages of non-toxic, non-polluting, environmentally friendly, very suitable for long-run printing, and can produce large-format multi-color corrugated boxes.

　　Gravure printing is highly efficient, with a printing speed of 150-200m/min and a printing color count of 4-10 colors, and it can also print special inks such as gold and silver ink. Because gravure printing uses steel chromium-plated electro-engraved gravure plates, the printing resistance can reach 3 to 4 million prints, making it ideal for the production of corrugated boxes with large quantities of long-run jobs.

　　The pre-printing method has special requirements for the face paper, and the paper often uses coated white board paper, hanging pulp white board paper, white cardboard and many other kinds, each of which has its own advantages and disadvantages. Coated white board paper has good color expression, but when laminated through the high-temperature baking channel of a corrugated board production line, the surface coating of the paper will change to varying degrees, affecting the color effect of the graphic surface. Hanging pulp white board paper can largely meet the high-temperature requirements of the laminating process, but the rough surface of hanging pulp white board paper makes it easy for graphic dots to be lost and insubstantial, and the ink consumption is also relatively large. White cardboard is the first choice for corrugated box top paper. It not only fully expresses the color effect of printed graphics, but also can well adapt to the special requirements of the high-temperature laminating process.