US 10,844,547 B2Granted

Process for the in-situ adjustmen of ion concentrations during the manufacturing of web materials

AssigneeEldorado Brasil Celulose S.A.

InventorsFernando Henrique-Pescatori Silva, Dale Kavalew

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Abstract

A process for manufacturing a web material is disclosed. The process generally comprises the steps of providing a papermaking machine with a monovalent inorganic ionizable cation species (MIICS) and a divalent inorganic ionizable cation species (DIICS) measuring devices, measuring molar concentrations of MIICS and DIICS in the web material with the MIICS and DIICS measuring devices and calculating a molar ratio of the measured molar concentration of the MIICS to the measured molar concentration of the DIICS, and subsequently determining if the calculated molar ratio is about less than or equal to 10. If the molar ratio is greater than 10, adding an amount of DIICS to the papermaking machine and manufacturing the web material with the papermaking machine with the added amount of DIICS.

Claims19

Dependent claims

A process for manufacturing a creped web material, said process comprising the steps of:

a) providing a papermaking machine;
b) providing said papermaking machine with a monovalent inorganic ionizable cation species (MIICS) measuring device disposed in a papermaking system selected from the group consisting of a pulp making process system, a pulp mill, pulper, a thick stock feed system, a papermaking machine fresh or make-up water system, a papermaking machine white water system, said web material surface, a creping adhesive composition, and a Yankee dryer surface;
c) providing said papermaking machine with a divalent inorganic ionizable cation species (DIICS) measuring device disposed in a papermaking system selected from the group consisting of a pulp making process system, a pulp mill, a pulper, a thick stock feed system, a papermaking machine fresh or make-up water system, a papermaking machine white water system, said web material surface, a creping adhesive composition, and a Yankee dryer surface;
d) manufacturing said web material with said papermaking machine;
e) measuring a molar concentration of said MIICS in said web material with said MIICS measuring device;
f) measuring a molar concentration of said DIICS in said web material with said DIICS measuring device;
g) calculating a molar ratio of said measured molar concentration of said MIICS to said measured molar concentration of said DIICS;
h) determining if said molar ratio calculated in said step g) is about less than or equal to 10;
i) if said molar ratio is greater than 10, adding an amount of DIICS to said papermaking machine until said molar ratio is less than or equal to 10;
j) manufacturing said web material with said papermaking machine with said added amount of DIICS;
k) applying a creping adhesive to a surface of a Yankee drum drying system;
l) adhering said web material to said surface of said Yankee drum drying system;
and,
m) creping said web material from said surface of said Yankee drum drying system to form said creped web material.

11 more elements

A process for manufacturing a creped web material, said process comprising the steps of:

a) providing a papermaking machine;
b) providing a Yankee drum drying system;
c) providing said Yankee drum drying system with a creping adhesive;
d) applying a portion of said creping adhesive to a surface of said Yankee drum drying system;
e) providing said papermaking machine with a monovalent inorganic ionizable cation species (MIICS) measuring device;
f) providing said papermaking machine with a divalent inorganic ionizable cation species (DIICS) measuring device;
g) manufacturing said web material with said papermaking machine;
h) directing said web material toward said surface of said Yankee drum drying system;
i) measuring a molar concentration of said MIICS in said web material with said MIICS measuring device;
j) measuring a molar concentration of said DIICS in said web material with said DIICS measuring device;
k) calculating a molar ratio of said measured molar concentration of said MIICS to said measured molar concentration of said DIICS;
l) determining if said molar ratio calculated in said step k) is about less than or equal to 10;
m) if said molar ratio is greater than 10, adding an amount of DIICS to said web material until said molar ratio is less than or equal to 10;
n) adhering said web material to said surface of said Yankee drum drying system;
o) manufacturing said web material with said papermaking machine with said added amount of DIICS;
and,
p) creping said web material from said surface of said Yankee drum drying system to form said creped web material.

14 more elements

A process for manufacturing a creped web material, said process comprising the steps of:

a) providing a papermaking machine having a papermaking machine water system and a Yankee drum drying system;
b) providing said papermaking machine water system with a monovalent inorganic ionizable cation species (MIICS) measuring device;
c) providing said papermaking machine water system with a divalent inorganic ionizable cation species (DIICS) measuring device;
d) manufacturing said web material with said papermaking machine;
e) measuring a molar concentration of said MIICS in said papermaking machine water system with said MIICS measuring device;
f) measuring a molar concentration of said DIICS in said papermaking machine water system with said DIICS measuring device;
g) calculating a molar ratio of said measured molar concentration of said MIICS to said measured molar concentration of said DIICS;
h) determining if said molar ratio calculated in said step g) is about less than or equal to 50;
i) if said molar ratio is greater than 50, adding an amount of DIICS to said papermaking machine water system until said molar ratio is less than or equal to 50;
j) manufacturing said web material with said papermaking machine with said added amount of DIICS;
k) applying a creping adhesive to a surface of said Yankee drum drying system;
l) adhering said web material to said surface of said Yankee drum drying system;
and,
m) creping said web material from said surface of said Yankee drum drying system to form said creped web material.

11 more elements

Dependencies are inferred from the claim text.

Facts

Application: 16/207,134Filed 1 Dec 2018 · us provisional application
Priority: 13 Apr 2018
Published: US 2019/0316297 A117 Oct 2019
Granted: 24 Nov 2020
Term ends: Not estimatedThe source records don’t support an estimate.

Classification25 codes

D21H 23/78
Processes or apparatus for adding material to the pulp or to the paper: controlling or regulating not limited to any particular process or apparatus
B31F 1/126
Crêping: including making of the paper to be crêped
D21F 5/181
Drying webs by hot air: on Yankee cylinder
D21F 7/00
Paper-making machines: other details of machines for making continuous webs of paper