Core Paper Capillarity via Surface-Active Additives
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Solution Overview
Problem
The production of core paper using fresh fibers is costly and resource-intensive, while recycled fibers often fail to meet the required strength and impregnation properties, leading to increased costs and environmental concerns.
Innovation Solution
A method for producing core paper using a mixture of recycled fibers and wet strength agents, with the addition of surface-active substances to enhance capillarity, allowing for improved wet strength and impregnation properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If recycled fiber materials are used to produce core paper, then raw material costs are reduced, but the required strength and impregnation properties are not met
Solution Approach 1:
The patent changes the chemical parameters of the fiber mixture by introducing specific wet strength agents (such as polyurethane dispersions, polyvinyl alcohol, or starch) and surface-active substances in controlled concentrations. This modifies the physical and chemical properties of recycled fiber materials to achieve the required strength and impregnation characteristics while maintaining cost advantages.
Solution Approach 2:
The patent creates a composite material system combining recycled fiber materials with wet strength agents and surface-active substances. This composite approach leverages the cost benefits of recycled fibers while the additives compensate for their inferior mechanical properties, achieving both economic and performance objectives.
2Strength
If wet strength agents are added to recycled fiber materials, then wet strength is improved, but capillarity and impregnation behavior deteriorate
Solution Approach 1:
The patent introduces surface-active substances as intermediary agents that mediate between the wet strength agents and the recycled fiber materials. These surface-active substances modify the surface properties of the fibers and the liquid impregnation medium, enabling both wet strength development and proper capillarity/impregnation behavior to coexist.
Solution Approach 2:
The patent adjusts the concentration ratios and chemical composition of wet strength agents and surface-active substances to optimize the balance between wet strength and capillarity. By controlling these parameters, the patent achieves simultaneous improvement in both wet strength and impregnation properties.
3Loss of substance
If low basis weights are used to reduce costs, then production costs are reduced, but strength requirements increase accordingly
Solution Approach 1:
The patent changes the chemical composition parameters by incorporating wet strength agents and surface-active substances that enhance the mechanical properties of the paper at lower basis weights. This allows cost reduction through lower material usage while maintaining required strength levels through chemical enhancement.
Solution Approach 2:
The patent creates a composite structure where recycled fiber materials are combined with strengthening additives to achieve the required mechanical properties at reduced basis weights. This composite approach enables cost efficiency while meeting strength requirements that would otherwise demand higher material consumption.
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 method achieves comparable or improved capillarity and wet strength, reducing raw material costs and environmental impact while meeting the demanding conditions for strength and impregnation properties, enabling the use of up to 100% recycled fibers.
Implementation Method 1
addition of a surface-active active substance as a second additive during production to increase capillarity
Implementation Method 2
the formation of hydrogen bonds, which are responsible for the strength of the paper
Implementation Method 3
wet strength agents, among other things, connect the fibers at the points of contact and crossing
Data Source
AI summary
The present invention relates to a core paper comprising fiber material for producing a carrier material that can be laminated and that has at least one proportion of a reconstituted fiber material mixture and a wet sealer as a first additive, characterized in that the core paper comprises at least one active substance active on the boundary surface as a second additive for increasing capillarity at a weight proportion of 0.05% to 2% relative to the material. According to the invention, advantages of the core paper are the ability to apply up to 100% of a reconstituted fiber material mixture in production and the property of good capillarity of the core paper, important for the subsequent impregnation process. Good impregnation properties of the core paper according to the invention are the basic prerequisite for obtaining high wet strength.