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The Basic Effects of Recycling on Pulp Properties

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Abstract

Using standard laboratory procedures it was found that different pulp types showed very different recycling effects. Mechanical pulp fibres became flatter and more flexible giving a denser, stronger sheet. Beaten chemical pulp fibres “hornified”, resulting in a bulkier, weaker sheet. Unbeaten chemical pulp fibres were initially curly; recycling removed the curl. A mechanical/chemical pulp blend revealed that these effects occur at different rates. In no case was there evidence of fibre strength loss, or of fibre embrittlement. In these laboratory experiments, fines loss during sheetmaking affected the magnitude of the sheet properties, but not the trends.

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Acknowledgements

Recycling experiments of this nature generate an enormous amount of repetitive testing. The authors are grateful for the skilled and careful work of P. Scudamore and colleagues of the Physical Testing Section, and J. Sfigakis, M. O'Neil1, G. de Silveira, A. Kings1and and C. St.-Amour. We are also pleased to acknowledge many helpful discussions with Drs. A.M. Scallan, D.H. Page and N. Gurnagul.

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Authors and Affiliations

  1. Pulp and Paper Research Institute of Canada, 570 St. John's Boulevard, Pointe Claire, Quebec, Canada, H9R 3J9

    R. C. Howard & W. Bichard

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  1. R. C. Howard
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  2. W. Bichard
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Howard, R.C., Bichard, W. The Basic Effects of Recycling on Pulp Properties. MRS Online Proceedings Library 266, 195–214 (1992). https://doi.org/10.1557/PROC-266-195

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