Fibre Furnish and Paper Analysis

Fibres from the two main divisions of trees, hardwoods and softwoods differ considerably and give distinct properties to the resultant paper.

FibresSoftwood fibres, commonly from pine, spruce and fir are long (2-3.5mm). Long fibres give the paper/board strength, but also rough. Hardwood fibres such as eucalyptus and poplar are shorter (1-1.5mm) and although weaker, can provide a smoother surface for printing. Usually a combination of fibre types provides the optimal performance.

Quantitative fibre furnish analysis is made in accordance with British standard BS 7463, International standard ISO 9184 and BPBIF PP No.50 by microscopic examination of a dried suspension of fibres.

Fibres are identified by comparison with a microphotograph of reference fibres and the ratio of the mix of types of fibres is estimated. A weighting factor is used in the calculations for the ratios of the different fibres.

Expert Profile

  • Doug joined Pira in 1989 and has 20 years experience in the physical testing of packaging and packaging materials. He heads a team specialising in packaging and print related technical investigations. In 2004 Doug gained his postgraduate degree with distinction in Packaging Technology from Brunel University.

    Doug Leatherdale
    Doug Leatherdale

    Head of Physical Testing

    Pira International

    +44 1372 80 2108

bottom Blend image