Aerodynamic Forming of Tissue

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UDС

676.026.21

DOI:

10.17238/issn0536-1036.2015.1.126

Abstract

The method of aerodynamic paper forming, an alternative papermaking method is used in the research. Paper web is formed through depositing pulp fibers from a wet air flow on a wire while maintaining moisture content of the layer formed at the rate of 30%, ensuring interfiber bonding without any strengthening additives. The use of the aerodynamic forming method in papermaking is expected to decrease power inputs for repulping and paper drying processes in addition to small water consumption. The density of fiber packing in the web is no more than 25 kg/m3, allowing the most efficient sanitary tissue making with the aerodynamic forming method. These paper grades are notable for their bulk, softness and high absorbability. In pressing on a wire the segments in the fibrous layer are formed, which contribute strength properties and moisture capacity of paper. Due to the distinctions between the aerodynamic paper forming technology and the traditional method some parameters of the wires used presently in the pulp and paper industry were changed. Calculation of shaping wire parameters is given for formation of the relief consisting of the segments with various density of fiber packing in paper web while pressing fibrous layer. Bulky segments are responsible for high paper absorbability; they are formed in the cells between sharing wire filaments. Dense segments are responsible for paper strength properties. Sizes of dense segments and distances between them eliminate the possibility for paper to be broken in bulky segments only. The fibers are additionally moistened for forming strong interfiber links. The conditions are given for capillary water to be absorbed by dense segments of paper web solely excluding moistening of the whole fibrous layer. Paper samples are formed with the aerodynamic method at the batch device. Conditions for paper sample forming with the use of bleached kraft pulp of apparent weight 30 – 50 g/m2, selective moistening of their fibrous layers as the well as methods of introducing aids ensuring wet strength of the samples were determined. Pressing was made with the developed technology using the offered wire. Main indices of the test paper samples meet the GOST R 5235–2005 requirements for tissue items.

Authors

V.M. Drobosyuk, Candidate of Chemistry, Senior Research Officer G.K. Malinovskaya, Candidate of Chemistry L.V. Litvinova, Candidate of Chemistry, Senior Research Officer

Affiliation

Saint Petersburg State Technological University of Plant Polymers, Ivan Chernyh str., 4, Saint Petersburg, 198095, Russia; е-mail: vdrobosyuk@yandex.ru

Keywords

fiber packing density, paper strength, water-absorbing capacity, profiling wire.

References

1. Terentiev О.А., Drobosyuk V.M. Sposob ajerodinamicheskogo izgotovlenija kartona, pischej ili pechatnoj bumagi [Aerodynamic Method of Manufacturing of Paperboard, Writing and Printing Paper]. Patent RF, no. 2100508, 1994. 2. Drobosyuk V.M. Ajerodinamicheskij sposob izgotovlenija sanitarno-gigienicheskoj bumagi [Aerodynamic Method of Manufacturing of Sanitary Tissue]. Patent RF, no. 2159304, 1998.