Flocculated Filler Particles for High-Loading Paper
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Solution Overview
Problem
Current processes for producing self-binding pigment particles are limited by low solids content suspensions, leading to unwanted losses of polymeric binder and agglomerate formation, and often result in suboptimal mechanical and optical properties in paper products due to inefficient interaction between filler particles and paper fibers.
Innovation Solution
A process involving the combination of two aqueous suspensions, each containing a different flocculating additive, to create flocculated filler particles that can be used without a separate binder, optimizing particle size distribution and interaction with paper fibers for improved mechanical and optical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If low solids content suspensions are used in self-binding pigment particle production, then the particles can be easily processed and handled, but binder loss increases and agglomerates form
Solution Approach 1:
The patent changes the physical-chemical parameters of the suspension by introducing flocculating additives that modify the interaction between filler particles and binder. This allows the suspension to maintain processability while reducing binder loss through controlled flocculation that prevents excessive binder adsorption onto individual particles.
Solution Approach 2:
The flocculating additive acts as an intermediary substance between the filler particles and the polymeric binder. It mediates the interaction by controlling the flocculation process, thereby reducing unwanted binder adsorption and preventing agglomerate formation while maintaining ease of processing.
2Productivity
If high filler levels are added to paper, then production costs are reduced and natural resources are saved, but the area of contact between fibres decreases and sheet strength is reduced
Solution Approach 1:
The patent modifies the physical parameters of filler particles by controlling their size distribution and morphology through the flocculation process. This creates particles with optimized surface area and shape that maintain fibre contact area even at high filler concentrations, thereby preserving sheet strength while enabling cost-effective high-fill formulations.
3Stability of the object's composition
If self-binding pigment particles are produced by grinding mineral materials in the presence of binder, then intimate binding between mineral material and binder is achieved, but mechanical stability may be compromised by suboptimal particle shape
Solution Approach 1:
The patent changes the morphological parameters of the filler particles by controlling the flocculation process during particle formation. This produces particles with optimized shapes that maintain intimate binding between mineral material and binder while improving mechanical stability and interaction with paper fibres.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The process enables the production of paper products with enhanced strength and optical properties, allowing for higher filler loadings without compromising fiber interaction, thus reducing production costs and environmental impact.
Implementation Method 1
a process involving the combination of two aqueous suspensions, each containing a different flocculating additive, to create flocculated filler particles
Data Source
AI summary
The present invention concerns a process for the preparation of flocculated filler particles, wherein at least two aqueous suspensions of at least one filler material and at least one flocculating additive are combined.