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ABSTRACT
The disintegration and refining of pulp are two essential, high-energy consumption processes upstream of the fabrication of chain of papers and cardboards. Disintegration transforms the pulp into an aqueous, fibrous and homogeneous suspension. Refining then subjects this suspension to a mechanical processing that brings physical, chemical and morphological modifications to fibers. The equipment used varies according to the nature of the fibrous raw material, which can be in the form of pulp bales, mass fraction suspension or recovered cellulose fibers. The aim of disintegration is to obtain an homogeneous, pumpable fibrous suspension as well as the separation of coarse contaminants from fibers.
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Read the articleAUTHOR
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Jean-Claude ROUX: University Professor at INP Grenoble - French School of Stationery and Graphic Industries
INTRODUCTION
This dossier presents two key operations upstream of the paper and cardboard production chain: pulping and refining. It complements
Disintegration transforms pulp into a homogeneous fibrous suspension in water, while refining brings about physical, chemical and morphological changes in the fibers by mechanically treating this aqueous suspension. Both operations are highly energy-intensive.
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Pulp disintegration and refining
Disintegration – Resuspension
Documentation sources
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Standards
Determination of the Schopper-Riegler index of paper pulp is the subject of a French standard, AFNOR NF Q 50 003, and an international standard, ISO 5267-1: Drainability of pulp by the Schopper-Riegler method.
Manufacturers – Suppliers – Distributors
In France, manufacturers of disintegrators (pulpers), disc refiners, conical refiners and linings for refiners are :
ABK Machinery http://www.abkmachinery.com
Allimand http://www.allimand.com
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Organizations
The Centre Technique du Papier (CTP) is the industrial technical center for the French paper industry. It is one of the supervisory bodies of the Laboratoire de Génie des Procédés Papetiers (LGP2), a joint CNRS 5518 research unit at the École Française de Papeterie et des Industries Graphiques (EFPG), part of the Institut Polytechnique de Grenoble (IPG). These two organizations can respond to requests from industry within...
Economic data
In relation to the total energy installed in a paper mill (non-integrated mill), the proportion of energy consumed for pulp disintegration represents an average of 2 to 6%, or 30 to 150 kJ/kg in useful (or net) mass energy. For the industrial refining operation, at low mass fractions (2 to 6%), the proportion of energy installed represents 5 to 30%, or 350 to 850 kJ/kg in useful mass energy.
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