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1. EP0760094 - METHOD OF QUANTIFYING PERFORMANCE CHEMICALS IN PULP AND PAPER

Office European Patent Office
Application Number 95920336
Application Date 12.05.1995
Publication Number 0760094
Publication Date 05.03.1997
Publication Kind B1
IPC
G PHYSICS
01
MEASURING; TESTING
N
INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
21
Investigating or analysing materials by the use of optical means, i.e. using infra-red, visible, or ultra-violet light
62
Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light
63
optically excited
64
Fluorescence; Phosphorescence
G PHYSICS
01
MEASURING; TESTING
N
INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
21
Investigating or analysing materials by the use of optical means, i.e. using infra-red, visible, or ultra-violet light
17
Systems in which incident light is modified in accordance with the properties of the material investigated
25
Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
27
using photo-electric detection
G PHYSICS
01
MEASURING; TESTING
N
INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
21
Investigating or analysing materials by the use of optical means, i.e. using infra-red, visible, or ultra-violet light
17
Systems in which incident light is modified in accordance with the properties of the material investigated
25
Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
31
Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
35
using infra-red light
G PHYSICS
01
MEASURING; TESTING
N
INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
33
Investigating or analysing materials by specific methods not covered by groups G01N1/-G01N31/131
34
Paper
G01N 21/64
G01N 21/27
G01N 21/35
G01N 33/34
CPC
G01N 21/359
G01N 21/3563
G01N 33/343
G01N 33/346
Applicants EKA CHEMICALS AB
Inventors HELMER ULLA
RENBERG LARS
OLSSON RALF
Designated States
Priority Data 9401718 18.05.1994 SE
9500535 12.05.1995 SE
Title
(DE) VERFAHREN ZUM QUANTIFIZIEREN VON QUALITÄTSERHÖHENDEN CHEMIKALIEN IN PULPE UND PAPIER
(EN) METHOD OF QUANTIFYING PERFORMANCE CHEMICALS IN PULP AND PAPER
(FR) PROCEDE DE QUANTIFICATION D'AGENTS CHIMIQUES FONCTIONNELS DANS DU PAPIER ET DANS DE LA PATE A PAPIER
Abstract
(EN)
A method for quantifying of the amounts of reacted and/or retained performance chemicals selected from the group consisting of wet strength agents, starches and retention agents, hydrophobic agents and debonding agents in pulp and/or paper, which method comprises (I) developing a calibration model by (I.a) registering absorption, reflectance or emission spectra of reference samples of papers containing known amounts of the said reacted and/or retained performance chemicals to develop learning sets; (I.b) processing the spectral raw data, to reduce noise and adjust for drift and diffuse light scatter; (I.c) performing a data analysis by applying chemometric techniques to the processed learning sets; and (II) determining the unknown amounts of reacted and/or retained pulp and paper performance chemicals selected from the group consisting of wet strength agents, starches and retention agents, hydrophobic agents and debonding agents by registering the absorption, reflectance or emission spectrum, in correspondence to (I.a), from the pulp and/or paper of the unknown amounts of the said reacted and/or retained performance chemicals of pulp and paper; 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 of the unknown amounts of the said reacted and/or retained performance chemicals.

(FR)
Procédé servant à quantifier des agents chimiques fonctionnels ayant réagi et/ou retenus, sélectionnés dans le groupe constitué d'agents de résistance à l'état humide, d'amidons, d'agents de rétention, d'agents hydrophobes et d'agents de décollage dans de la pâte à papier et/ou du papier. Ledit procédé consiste à: (I) créer un modèle d'étalonnage par: (I.a) enregistrement de l'absorption, de la réflectance ou du spectre d'émission d'échantillons de référence de papier contenant des quantités connues desdits agents chimiques fonctionnels, afin de générer des ensembles d'apprentissage; (I.b) traitement des données spectrales brutes, afin de limiter le bruit et d'ajuster la dérive et la diffusion de lumière; (I.c) réalisation d'une analyse de données par application de techniques chimiométriques aux ensembles d'apprentissage traités; (II) déterminer les quantités inconnues d'agents chimiques fonctionnels ayant réagi et/ou retenus dans le papier ou dans la pâte à papier et sélectionnés dans le groupe constitué d'agents de résistance à l'état humide, d'amidons, d'agents de rétention, d'agents hydrophobes et d'agents de décollage, par enregistrement de l'absorption, de la réflectance ou du spectre d'émission, par rapport à (I.a), de la pâte à papier et/ou du papier contenant lesdites quantités inconnues, à traiter les données spectrales brutes obtenues selon (I.b) et à appliquer le modèle d'étalonnage créé aux données traitées. On peut éventuellement appliquer une étape d'analyse de données, selon (I.c), aux données spectrales brutes traitées du papier contenant les quantités inconnues desdits agents chimiques fonctionnels.

Also published as
FI960243