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Adhesion

Adhesion

Adhesion occurs when one type of molecule is attracted to a different molecule. Water exhibits adhesive properties in the presence of polar surfaces, such as glass or cellulose in plants. For instance, when water is poured into a glass, the positively charged hydrogen molecules of water are more attracted to the negatively charged oxygen molecules in the silica than to the oxygen in neighboring water molecules.
Capillary action is a result of water’s adhesive tendencies. When a narrow...

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Using Adhesive Patterning to Construct 3D Paper Microfluidic Devices

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Addressing Adhesive-Induced Agglomeration: Metal Detachment and Flow Behavior in Recycled Paper Fibres/Cellulose.

Sirje Liukko¹, Katarina Dimic-Misic^1,2, Shailesh Singh Chouhan³

¹Department of Chemical and Metallurgical Engineering, School of Chemical Engineering, Aalto University, 02150 Espoo, Finland.

|September 13, 2025

Summary

Recycled paper fibers contain metal particles that impact packaging quality. Washing and deinking effectively remove metals with low electronegativity, improving pulp rheology for safer, sustainable packaging.

Keywords:

deinking of waste paper/recycled paper mass fraction of heavy metals in recycled paper plasma mass spectrometry recycling paper rheology

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Area of Science:

Materials Science
Chemical Engineering
Environmental Science

Background:

Modern packaging utilizes a blend of virgin and recycled cellulose fibers.
Recycled fibers introduce contaminants like sticky particles, binders, metals, and ink.
These contaminants negatively affect pulp rheology, process efficiency, and final product quality.

Purpose of the Study:

To investigate the presence and removal of metal particles from recycled paper pulp.
To assess the impact of metal removal on pulp rheology for packaging applications.
To optimize deinking and washing processes for enhanced pulp safety and quality.

Main Methods:

Pulping and deinking of recycled coated paper using conventional washing.
Quantification of metal content in cellulose pulp via Inductively Coupled Plasma Mass Spectrometry (ICP-MS).
Rheological measurements to evaluate the effect of contaminants on pulp flow behavior.

Main Results:

Metal particle separation is influenced by coating amount, adhesives, and metal electronegativity.
Metals with lower electronegativity (Ag, Ti, Cr, V, Zn) are readily removed during washing and deinking.
Improved pulp rheological behavior was observed after the removal of these metals.

Conclusions:

Effective removal of specific metal particles is crucial for producing safe and high-quality packaging.
Optimizing deinking and washing processes based on metal properties enhances recycled pulp usability.
This research contributes to sustainable packaging solutions by improving recycled fiber processing.