How can we control expension of paper board in printing? than we get exact position in Die-cutting process in offset printing.

Paper to be stored in cool & dry place avoiding humidity. Although after taking utmost care, paper may get expanded or shrink slightly; also the image printed on the paper can be reduced/expanded slightly according to the pressure between Impression & blanket. To avoid this problem, The dye artwork/diagram has to be printed along with the printed artwork and Final Dye Punch to be made according to dye image printed on the actual sheet.

Best way to avoid this problem that you get the paper one cycle without printing only water then printing

Paperboard is sensitive to changes in humidity. Ex-posure to variations of humidity will result in a change of paperboard shape or dimensions. Paperboard is manu-factured to be flat in a defined environment; exposureo another environment will create a situation where the paperboard shape is unstable. Information concerning the end use environment must be given to the board maker. A paperboard is made of cellulose fibres there is practically no way to prevent the paperboard adopting a moisture content which is in equilibrium with the surrounding air.Any change in moisture will affect the diameter of the cellulose fibre and hence the paperboard shape. Depending on the type of fibre and treatment the change in shape can vary from one paperboard grade to another.Both Folding Box Board and Solid Bleached Board are manufactured from primary fibres, which means that their behaviour in different climate conditions is predictable. Flatness and dimensional stability characteristics Flatness and dimensional stability equate with the paper-board’s ability to withstand the effect of humidity changes in the environment. Hope the above mentioned answer will provide the solution of your problem