Method of quantifying the properties of paper

US5680321A · kind A · utility

Assignee

• Eka Nobel AB · SE

Inventors

• Ulla Helmer · Solna, SE
• Lars Renberg · Västerhaninge, SE
• Ralf Olsson · Stockholm, SE

Key dates

• Filing date: May 18, 1995
• Grant date: Oct 21, 1997
• Expiry date: May 18, 2015

Classification

• Technology area (CPC G): Physics
• CPC primary: G01N33/343
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A method for the quantification of the one or several of the physical properties selected from dry tensile strength, hydrophobicity, debonding energy, bursting strength, wettability and printability of pulp and/or paper which method comprises PA1 (I) developing a calibration model by PA2 (I.a) registering absorption, reflectance or emission spectra of reference samples of paper of known properties as defined above to develop learning sets; PA2 (I.b) processing the spectral raw data, to reduce noise and adjust for drift and diffuse light scatter; PA2 (I.c) performing a data analysis by applying chemometric techniques to the processed learning sets; and PA1 (II) determining the unknown properties as defined above of pulp and/or paper by registering the absorption, reflectance or emission spectrum, in correspondence to (I.a), from the pulp and/or paper having unknown properties; processing the thereby obtained spectral raw data as according to (I.b); and applying the developed calibration model to the processed data. Optionally, a data analysis step as according to (I.c) can also be applied to the processed spectral raw data from the paper having unknown properties.