Improved quality control and process design in production of mechanical pulp by use of factor analysis

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Improved quality control and process design in production of mechanical pulp by use of factor analysis

Ferritsius, Olof (författare): STORA Corporate Research

Ferritsius, Rita (författare): STORA Corporate Research

(creator_code:org_t)

1997
1997
Engelska.
Ingår i: Proceedings International Mechanical Pulping Conference. ; , s. 111-125

Relaterad länk:: https://urn.kb.se/re...

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Abstract Ämnesord

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In 1963, Forgacs showed that at least two quality variables are needed in order to characterize the quality of mechanical pulps. Later, Strand came to asimilar conclusion by introducing two independent common factors through the use of factor analysis. Both Forgacs and Strand showed that handsheet properties can be predicted from these two factors. This paper shows how STORA, on the basis of Strand’s approach, examines the two independent common factors directly, instead of examining a large amount of conventional measured pulp and handsheet properties. The factors are called F1, fibrebonding, and F2, long fibre influence. The independent factors are controlled to a great extent by independent process parameters; F1 correlates more strongly to specific energy than does freeness while F2 is mainly controlled by conditions in the defibration stage. In order to produce a uniform pulp quality, F1 and F2 should be kept inside a specified quality window. Since July 1995 a quality window in terms of F1 and F2 has been used at STORA Kvarnsveden TMP plant and thus has given a more stable pulp quality. The quality window gives a rapid overview of the status of the quality. Another advantage of applying F1 and F2 is that not only refiners, but also screens and cleaners can be evaluated in terms of the same quality variables. New parameters for evaluation of screens and cleaners are suggested. By examining all process stages from chip refiner, screen room to final pulp we can get a quality map in terms of F1 and F2. From this map it is quite obvious how the pulp quality is influenced by chip refiner stage and rejects refining. The F1/F2-map can simplify the work to find reasons for producing off-spec pulp and also mee tone big challenge: to produce a product of more uniform quality. To attain more uniform quality we have to think and speak daily in terms of factors like F1 and F2.

Ämnesord

TEKNIK OCH TEKNOLOGIER -- Materialteknik -- Pappers-, massa- och fiberteknik (hsv//swe)
ENGINEERING AND TECHNOLOGY -- Materials Engineering -- Paper, Pulp and Fiber Technology (hsv//eng)

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TEKNIK OCH TEKNOLOGIER: TEKNIK OCH TEKNO ...; och Materialteknik; och Pappers massa oc ...

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