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Now showing items 11-20 of 31
Practical application of idler roller performance measurements and models
(Oklahoma State University, 2003-06)
Idler rollers are present in abundance on most web processing lines. Their simple design, a rotating cylinder driven by the web-to-roller traction, lead most to go unmonitored until degrading performance results in product ...
Effects of non-ideal webs on roll winding
(Oklahoma State University, 2003-06)
In typical winding processes, webs are rarely (if ever) ideal but instead thickness non-uniformity and distortions (two examples) are the norm. These deviations from ideal have significant ramifications to both predictive ...
Out-of-round paper rolls
(Oklahoma State University, 2003-06)
Paper is usually shipped in rolls covered by a thin wrapper to protect it from moisture and dirt. In effect, the roll becomes the shipping container for the paper. A single sheet of paper is weak and fragile, but in roll ...
Finite element simulation of shear slitting of aluminum webs
(Oklahoma State University, 2003-06)
A three-dimensional finite element (FE) procedure has been developed to simulate shear slitting using ABAQUS/Explicit, and the process of shear slitting has been investigated for aluminum webs obeying elastic-plastic ...
Macroscopic effects of surface roughness in confined air-flow
(Oklahoma State University, 2003-06)
One challenge when processing flexible media such as plastic films is to obtain rolls without any aspect defect : if one considers that a "defect" (i.e. wrinkling or buckling) is due to the fact that the stress generated ...
Installation and performance of classical web guides
(Oklahoma State University, 2003-06)
This paper depicts proper installations of conventional web guides and examines the theory of web mechanics and the theory of automatic control as foundations for the practice of web guiding. Conditions which would damage ...
Detection and characterization of web vibrations by artificial vision
(Oklahoma State University, 2003-06)
In this paper, we address the problem of the detection of transverse web vibrations by means of a digital camera and a laser dots pattern device. For this purpose, we briefly present some video processings which yield an ...
Future online concept for roll and sheet production in papermaking technology and process requirements for web handling
(Oklahoma State University, 2003-06)
The process of on-line converting is discussed as a chance to increase the productivity and quality in roll and sheet converting in paper mills. In this article the technical and process related prospects will be presented ...
Wound roll generated unstable vibration
(Oklahoma State University, 2003-06)
Nip contact between the wound roll and the winding drum, rider roll or some other nip roller may cause that the wound roll is deformed into a convex polygon. This deformation process is accompanied with a very strong ...
Method for measuring wound-on-tension
(Oklahoma State University, 2003-06)
The Wound On Tension (WOT) is the web machine direction stress as it has just passed the winding nip into the roll. It is the most important quantity that determines the wound roll structure and its internal radial stress ...