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Stretching in Sheeting Printing & Solution

Stretching in Sheeting Printing & Solution

Stretching in Sheeting Printing & Solution

Continuously stretching on paper when printing on multicolored offset printers is a problem that is difficult to print with high quality and lead to reduced productivity as well as large breakdown rates. The paper is unevenly stretched, usually in the form of a tin foil towards the end of the paper.

In the area near the tweezer pin we have the exact color overlay, but in the upper right or left corner of the printing sheet is not overlapping. The paper is stretched due to a variety of synthetic causes such as paper type, paper direction, humidifier, toner content of printed products, settings on the machine, etc. 

To solve this problem, the printing staff usually stretches the zinc sheet on the printing unit to compensate for the paper's width. This method works or not also depends on the structure of each type of printer. On the other hand, this method is not effective because it only affects a small area above the left and right of the printing sheet. In cases where strict requirements for color stacking applied, we have only one solution is to use small-size paper. This is also a very common solution for printing labels or packaging. The downside is that the machine's performance will be significantly reduced, with more rounds per minute, as well as cutting times.

This problem can only be solved at the manufacturing unit with the paper offset function. The ability to separate colors with different colors depending on the actual elasticity of paper has long been applied in offset printing rolls and brought great effects. The problem is that these functions can only scale in both vertical and horizontal directions. With a roll printer and low quality of print, it is satisfactory. But in the leaflet printing, the paper stretch is different from the roll printing and the requirement for color overlap is also higher. Heidelberg's RIP Meta Dimension has Paper Stretch Compensation that will perfectly compensate for sheet offsetting on the sheet printer. So how can we do it?

Depending on the type of paper and the printed product, we will have to arrange survey carbon along the edge of the paper and actually print with the largest size. After having a stable result of the ink level as well as the carbon color, this survey will tell us the value of stretching in each position. Enter the values of each corresponding position in the RIP Meta Dimension offseting paper as shown in the figure.

So with an optional function of RIP Meta Dimension, we have resolved the problem of paper stretching on the sheet printer. This capability offers tremendous possibilities when it is possible to print the entire size of the machine for branded products, which require absolute color overlap. With the paper offset function, we can shorten machine preparation time, alignment for high-end printing products, and more importantly, take full advantage of the printer's output capacity when it is able to print full-size.

Printing Megazine and Media No. 7/2010

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