OPTIMIZATION OF PROCESS DYNAMICS PRESS ROLL BILLETS FIRMWARE

The Dynamics of a Roll Press Nip Albany International

The press section of a paper machine is designed to remove by mechanical means the maximum possible amount of water from a just-formed paper sheet. The paper sheet is carried by a textile fabric conveyer belt through a series of roll nips, which cause water to be transferred from the sheet to the fabric. In the most general case the problem to be considered at each press nip involves transient ...

Multiphase flow in a roll press nip

A three-phase ensemble-averaged model is developed for the flow of water and air through a deformable porous matrix. The model predicts a separation of the flow into saturated and unsaturated regions. The model is closed by proposing an experimentally-motivated heuristic elastic law which allows large-strain nonlinear behaviour to be treated in a relatively straightforward manner. The equations...

Dynamics of roll waves

Shallow-water equations with bottom drag and viscosity are used to study the dynamics of roll waves. First, we explore the effect of bottom topography on linear stability of turbulent flow over uneven surfaces. Low-amplitude topography is found to destabilize turbulent roll waves and lower the critical Froude number required for instability. At higher amplitude, the trend reverses and topograph...

Numerical Methods for Predicting Roll Press Powder Compaction Parameters

Large numbers of cohesive powders are compacted using a roll press. The principle of compaction is that particulate materials become a compact when they are subjected to high pressure. Experimental work was carried out on pharmaceutical powders [1] to determine the influence of operating parameters on the roll process compaction. Theses parameters are determined for a given powder and must be m...

Cold roll forming process pdf