Main equipment and technical characteristics of direct offset printing on corrugated board

Corrugated board direct offset there is a limit

1) It is not possible to achieve board-to-board production like the flexographic printing equipment, and the production efficiency is relatively low.

2) At present, direct-printing board for offset printing is mainly printed on micro-corrugated board, and for heavy-weight board, it cannot be directly printed on the offset printing machine.

3) The offset printing format is relatively limited, and the types of webs that can be printed are relatively few.

However, with the renewal of offset printing technology and equipment and the invention of corresponding new materials, the above limitations can be alleviated or even eliminated to some extent.

From the above analysis, we can see that in the color box printing, direct offset printing will become the main printing method for miniature corrugated boxes. For paperboards and cardboards, which are relatively simple in shape and pattern and large in volume, they are still mainly printed in flexographic printing. For the top printing quality of the color box is used first offset printing and then processing methods.

Corrugated board direct offset technical features

The structural characteristics of the corrugated board determine its technical characteristics in direct offset printing. Corrugated board printing is performed on uneven surfaces formed by corrugation peaks and wave troughs. The printing pressure during printing must be higher than the printing pressure required for the surface smoothing material and the printing pressure must not damage the corrugated paperboard grooves and backs. . For such difficult requirements, it is impossible to achieve simple operation control of ordinary printing presses, but the development of corresponding technologies solves the above problems. These related technologies mainly include the following points:

1) The new type of blanket adopts a super-compressed sponge layer. The good elasticity can compensate corrugated board peaks and troughs. Printing pressure difference during direct offset printing improves the printing effect.

2) The successful development of new types of corrugated board also creates conditions for direct offset printing of corrugated board. Changes in the structure of the corrugated board increase the strength of the corrugated board and weaken the surface irregularities formed by corrugations and troughs of the corrugated board.

3) The successful development of new inks has improved the printing quality of direct offset printing on corrugated board. A good elastic blanket can reduce the pressure difference between corrugations and troughs of corrugated cardboard, but the pressure difference cannot be completely eliminated. This also creates a difference in printing pressure. This printing pressure difference leads to the expansion of ridges and recesses in different degrees. The overprinting of the ink thus creates a quality problem in the printing of corrugated paper - the production of a printed "cooking board" effect.

The new ink further reduces print quality problems due to unevenness in the surface of the corrugated board. For example, the Well-Perfect-EV1010-w ink developed by the German GS Ink Factory is designed for direct offset printing on corrugated paper.

4) The continuous development of the printing press structure provides the necessary conditions for the direct offset printing of corrugated board. Now offset printing equipment suppliers have noticed the development of offset printing in packaging printing, and have developed different types of printing equipment exclusively for packaging printing.

The direct offset printing of corrugated board due to the printing pressure, the cardboard strength will also have different degrees of decline, in the printing process under the premise of guaranteeing the printing quality, the printing pressure needs to be reduced as much as possible. Therefore, the direct offset pressure control of corrugated board is the most important issue that we should pay attention to. It has a direct impact on the printing quality and the board structure and is the key influencing factor of the final product quality.

Corrugated board direct offset printing main printing equipment

The rapid development of color carton in recent years is the industry's obvious corrugated board direct offset printing. With the successful development of various technologies, it has become increasingly mature. For this potential market, famous domestic and overseas offset press manufacturers have developed suitable corrugated paper directly. Offset equipment.

Here are just a few of the more interesting devices on the market:

KBA offset press: At the ChmaPrint2005 exhibition, KBA's operators printed the exquisite products on 157 g copper plate paper on the KBA 105 press first, and then changed the substrates to paperboard on the spot to complete the paper from paper to cardboard of different specifications. The conversion of the printing, the final printing quality of the G-type corrugated cardboard (1 ml-f1 in thickness) can be described perfectly.