The Effect of Pressing on the Structure Formation and Physicaland Mechanical Properties of Fluting

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UDС

676.026.4

DOI:

10.17238/issn0536-1036.2016.5.177

Abstract

A complex of consumer properties of paper and cardboard in the production environment is influenced by the working conditions of three basic parts of paperboard machines: forming, pressing and drying. A laboratory simulation of paper or cardboard samples, for example, in order to optimize the composition and properties, is often limited by a set of possible influenc-ing parameters. It refers to the simulation of the pressing process, as this process unlike the samples forming and drying processes, requires specialized equipment to adjust and maintain the desired pressure. As a variant of this equipment is a laboratory press TECHPAP 2011-004, which allows processing samples of paper or paperboard weighing of 20...600 g/m2 when changing clamping force (the line pressing pressure) from 2 to 6 kg/cm, and perform a multi-ple pressing at a fixed or variable load. This paper presents the results of laboratory simulation of the pressing pressure impact in different conditions and the analysis of the effect of this factor on the properties of fluting. The laboratory fluting isotropic samples of the traditional primary semi-finished products (softwood high-yield pulp and neutral sulfite semichemical pulp) and waste paper of various qualities are accepted as the objects of the research. The standard lab sheets are used in the experiments. This allows us to eliminate the influence of the anisotropy on the formation of the samples structure and properties. The treatment of wet flut-ing samples is carried out at one and multiple passes of lab sheets through the press. The re-sults of dryness measuring of the fluting samples with the use of a laboratory press have shown a good degree of approximation to the real conditions of a paper-making machine pressing. The range of variation of the paper web dryness in the laboratory conditions is from 17 to 42 %, therefore, the used compacting pressure can be compared with the values typical for the modern pressing parts of a machine. The fundamental differences of the impact of pressing conditions on the formation of the physical and mechanical fluting characteristics of primary and secondary fibers are installed. The use of pressing parameters in the fluting pro-cessing from waste paper requires taking into account the specifics of secondary fibers that have passed multiple processing and are characterized by the hornification of cell walls and increased fragility.

Authors

E.V. Dernova, Candidate of Engineering Sciences, Associate Professor V.V. Gorazdova, Postgraduate Student A.V. Gur'ev, Candidate of Engineering Sciences, Associate Professor

Affiliation

Northern (Arctic) Federal University named after M.V. Lomonosov, Naberezhnaya Severnoy Dviny, 17, Arkhangelsk, 163002; е-mail: v.gorazdova@narfu.ru; a.guriev@narfu.ru; e.demova@narfu.ru

Keywords

fluting, pressing, primary fiber, secondary fiber, waste paper.

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Received on February 15, 2016