influence of fiber and sheet structural properties on wet pressing
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influence of fiber and sheet structural properties on wet pressing

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Published .
Written in English


  • Paper -- Drying,
  • Paper -- Pressing

Book details:

Edition Notes

Statementby Lola Ann Nabors
The Physical Object
Paginationvi, 165 leaves :
Number of Pages165
ID Numbers
Open LibraryOL14428723M

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collapsed in wet pressing,which reduces the thickness of each layer. The total reduction in the paper thickness is the sum of the thickness reduction of each layer. Figure 4 shows the ith fiber in a layer of a sheet before and after it is pressed. Before the fiber is pressed, the fiber has width,D wi,thickness,D hi,and twist angle, β i. The properties of polypropylene fiber are dependent upon the structural characteristics of the macromolecules comprising the polymer; in turn, these macromolecules are significantly affected by (1) polymer properties prior to extrusion, and (2) processing conditions of fiber formation. Anthony V. Galanti, Charles L. Mantell. May 17,  · Despite much research into and development within the complex area of the initial wet web strength of paper, no complete model has yet been developed to describe this property. This type of paper strength is the most important property to ensure an effective paper machine run. Furthermore, the process of strength development in the sheet forming and pressing portion of the process is the basis Cited by: 9. A sheet that comes into a wet-press nip too wet, relative to the applied pressure may be crushed, meaning that the fiber structure created during formation is disrupted, often resulting in breaks. There has been some debate as to whether dry-strength chemicals increase the relative bonded area within paper or whether they increase the strength of bonding per unit of bonded area.

Do these differences have an influence on the dry solids content after wet pressing as suggested by Kang ()? which have an impact on the sheet structure, but also the pressing procedure between laboratory pressing and machine was very different. Effects of refining conditions on fiber properties,” in. most important functions of pressing are to increase sheet solid consistency in order to ensure adequate drying capacity, to consolidate the sheet, and enable web runnability in the early dryer sections. Increased sheet consistency increases wet strength and improves sheet consolidation and fiber-to-fiber bonding which increases sheet strength. pressing operation is important for the capacity and economy of a paper machine and has great influence on paper quality. It determines the dryness of the sheet entering the dryer section. It has a major impact on the structure and runnability of the paper and thus the operating efficiency of the machine (Wahlstrom, ). such properties as moisture content, density, dimensional stability, thermal and pyrolytic (fire) properties, natural durability, and chemical resistance. Familiarity with physical properties is important because those properties can significantly influence the performance and strength of wood used in structural applications.

Tensile and flexural modulus J. L. Thomason* and M. A. Vlug Shell Research B V, P O Box , BN Amsterdam, The Nether/ands (Received 21 August ; revised 23 November ) In this report we present the results from the first part of a study on the influence of fibre length ( mm) and concentration (% w/w) on the properties of Cited by: Fiber-Reinforced Polymers for Structural Rehabilitation. with prestressed fiber reinforced plastic sheets the physical properties of the materials used, and basic design criteria that. Carbon fiber is defined as a fiber containing at least 92 wt % carbon, while the fiber containing at least 99 wt % carbon is usually called a graphite fiber [1]. Carbon fibers generally have excellent tensile properties, low densities, high thermal and chemical stabilities in the absence of oxidizingCited by: Nov 01,  · Fourier transform infrared spectroscopy was used to investigate the chemical structure of down fibers in this paper. Contact angle was calculated to determine the wetting property of down. Experiments demonstrated that the surface chemical structure affected the fiber wetting property strongly. The surface substance by FTIR was forecast to be the mixture of sterol and triphosphate Jing Gao.