Effect of some printing nip variables on web tension

• Good runnability of paper web is an important factor for improving performance of printing process. Printing nips cause web tension variations which are known to affect web runnability. However, rather little is known about the exact effect of the nips on web tension. In this work, two dimensional finite element simulations are used to study the effect of some printing nip variables on web tension. In addition, the simulations results are compared with press trial results. The results show that nip blanket type and indentation depth has great impact on web tension. Particularly, mixing of different blanket types in adjacent printing units can cause severe variations to web tension. It is concluded that to attain good runnability the feeding characteristics of the printing blankets as well as the press settings should be known.

Ämnesord

TEKNIK OCH TEKNOLOGIER  -- Materialteknik -- Pappers-, massa- och fiberteknik (hsv//swe)

ENGINEERING AND TECHNOLOGY  -- Materials Engineering -- Paper, Pulp and Fiber Technology (hsv//eng)

Nyckelord

Blankets

Finite elements

Nip

Printing

Web tension

Publikations- och innehållstyp

ref (ämneskategori)

art (ämneskategori)