A papermaking process for white board paper composite sizing

By employing high-concentration impregnation in the dry zone of industrial urea aqueous solution, neutral high-temperature thermodynamic deconstruction, and rapid cooling conformation locking in cold white water, combined with turbulent misaligned dosing and pulsed coordination crosslinking, the problems of decreased swelling performance and white water pollution caused by the keratinization of waste paper fibers were solved, thereby improving the strength of whiteboard paper and reducing the pollution load.

CN122344845APending Publication Date: 2026-07-07SHENZHEN HEXINGYUAN PACKAGING PRODUCTS CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
SHENZHEN HEXINGYUAN PACKAGING PRODUCTS CO LTD
Filing Date
2026-04-23
Publication Date
2026-07-07

AI Technical Summary

Technical Problem

Waste paper fibers suffer from reduced swelling properties due to keratinization, resulting in insufficient paper strength and heavy white water pollution load in papermaking, which is difficult to effectively solve with existing technologies.

Method used

The process employs high-concentration impregnation in the dry zone of an industrial urea aqueous solution combined with neutral high-temperature thermodynamic deconstruction. It utilizes the conformational locking of cold white water in the paper machine wire section, and forms a three-dimensional ion coordination network through turbulent misaligned dosing and pulsed coordination crosslinking in the flow system, thereby improving fiber strength and reducing white water pollution.

Benefits of technology

It restores the swelling properties of fibers, improves the ring crush strength and interlayer bonding strength of whiteboard paper, and reduces the organic pollution load of cold white water in the paper machine wire section.

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Abstract

This invention relates to the field of papermaking processing technology and discloses a composite pulping and papermaking process for whiteboard paper, comprising the following steps: spraying waste paper raw materials with an industrial urea aqueous solution for high-concentration impregnation in a dry zone; injecting hot water for neutral high-temperature thermodynamic deconstruction to obtain a high-temperature medium-concentration pulp; instantaneously mixing the high-temperature medium-concentration pulp with cold white water in the wire section of a papermaking machine to implement rapid cooling and conformational locking to maintain the metastable open conformation of fibers; injecting anhydrous calcium chloride solution and subjecting it to high-frequency turbulent shearing to obtain a pre-crosslinked pulp; adding amphoteric starch adhesive and subjecting it to high-frequency fluid pulse shearing to complete pulse coordination crosslinking to obtain a crosslinked pulp; dehydrating and forming to obtain a wet paper web; and then subjecting it to heat shrink curing and drying to obtain whiteboard paper base paper. This invention constructs a three-dimensional ion coordination network through the synergistic effect of thermodynamic decoupling and kinetic coordination, which improves the ring crush strength index and interlayer bonding strength of the whiteboard paper base paper while repairing fiber keratinization defects, and effectively reduces the pollution load of the white water system.
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