Abstract
The paper summarizes the results of several numerical flow simulations of force influence of air flows on the treated paper sheet to get a contactless fixing of the treated material during its passage through the machine and to prevent the contact of the sheet with the structural elements in the surroundings.
Highlights
The results of modelling for basic revolutions (3 m/s or 13 rad/s) are as follows: Velocity field - the air volume in the wedge and the boundary layer at the cylinder surface are rotating together with the cylinder, the velocity is decreasing with an increased diameter
The solution is divided into two parts - elastic, where there are defined the forces needed for the deformation of the treated sheet into the cylindrical shape and aerodynamic, where the flows are modelled in such a manner to get force effects similar to the results of elasticity calculations
The model simulates the system of three cylinders, used on printing machine. They are alternatively furnished by covers and the periodical boundary condition is defined in the direction of the sheet movement so that it is simulated the influence of the neighbouring systems, too. (Remark: the position of the printing cylinder is not right - mistake but on the flow field between the pressing and transmitting cylinders it has not any basic influence.) The transmitting cylinder is solved as a model of moving mesh; the cylinders are solved as smooth surfaces with a defined peripheral velocity
Summary
The sheet of printed paper is drawn through the system of cylinders on printing machine, fixed at its front edge. The problem is that in certain moments of the process the free rear end of the sheet is drawn away from the cylinder surface and it is possible to touch the neighbouring structure . The result of it could be the damaged print (smudging) or damaged paper surface (abrasion). The goal of the study is the definition of the reason of this phenomenon, its analysis and a design of possible improvement
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