Volumizing Non-Woven Absorbent Structure Production
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Solution Overview
Problem
Existing methods for producing absorbent structures without fluff face challenges in achieving both high integrity and absorption capacity, as prioritizing one characteristic often compromises the other, with existing technologies like vacuum and electrostatic penetration methods being inefficient or costly.
Innovation Solution
A method and apparatus that disperses superabsorbent granular material within a highly voluminous non-woven layer using a combination of vacuum and volumizing devices to create a continuous absorbent structure, where the superabsorbent material is uniformly or non-uniformly distributed to enhance absorption and integrity, and an optional second non-woven layer is attached to the first for improved liquid distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If superabsorbent material is dispersed into a fibrous layer by means of vacuum and vibrations, then the absorption capacity is improved, but the penetration depth and distribution amount of superabsorbent material is insufficient
Solution Approach 1:
The patent replaces the mechanical vacuum-vibration system with an electrostatic field-based system. Superabsorbent particles are charged and attracted into the fibrous layer through electrostatic forces, enabling deeper and more uniform penetration without relying on mechanical agitation. This substitution resolves the contradiction by achieving both high absorption capacity and deep penetration through a fundamentally different physical mechanism.
Solution Approach 2:
The patent changes the physical parameters of the superabsorbent particles by charging them electrostatically before insertion. This parameter change (from neutral to charged state) enables the particles to be guided and distributed deeply within the fibrous layer through electrostatic attraction, overcoming the penetration limitations of mechanical methods while maintaining high absorption capacity.
2Manufacturing precision
If electrostatic penetration method is used to penetrate superabsorbent powder within a fibrous layer, then the distribution of superabsorbent material is improved, but the device complexity and safety risks increase due to high voltage requirements
Solution Approach 1:
The patent applies electrostatic charging and penetration locally at the point of particle application, rather than requiring a long electrostatic tunnel. By charging particles locally and using a controlled electrostatic field in the insertion region, the system achieves uniform distribution without the need for extensive high-voltage infrastructure, thereby reducing device complexity and safety risks.
Solution Approach 2:
The patent introduces charged particles as an intermediary between the charging mechanism and the fibrous layer. The electrostatic field acts as a mediator that guides these charged particles into the fibrous layer, enabling precise control of particle distribution without requiring direct high-voltage contact across long distances, thus simplifying the overall system design.
3Quantity of substance
If an absorbent core is produced without fluff to achieve high absorption capacity, then the absorption capacity is improved, but the integrity of the structure is compromised
Solution Approach 1:
The patent creates a composite structure where superabsorbent particles are embedded within a fibrous matrix material. This composite approach combines the high absorption capacity of superabsorbent materials with the structural integrity provided by the fibrous network, resolving the contradiction by allowing the structure to maintain both strength and absorption performance simultaneously.
Solution Approach 2:
The patent performs preliminary electrostatic charging of superabsorbent particles before insertion into the fibrous layer. This preliminary action ensures that particles are properly distributed and anchored within the matrix structure, preventing aggregation and maintaining structural integrity while achieving high absorption capacity throughout the absorbent core.
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 a high degree of integrity and absorption capacity in absorbent structures composed primarily of fibrous and superabsorbent materials, allowing for deep penetration and distribution of superabsorbent material, overcoming previous limitations in absorbent core production.
Implementation Method 1
a suction chamber (28) producing a vacuum, arranged facing an outer surface (26) of the transport device
Implementation Method 2
a first volumizing device (34) arranged downstream of the dispensing device and configured for increasing a specific volume of the first non-woven layer
Data Source
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AI summary
A method for producing an absorbent structure (10, 10') for absorbent sanitary articles, comprising the steps of: - advancing a first non-woven layer (12, 12') at a first speed (V1), with a first surface (18) of said first non-woven layer (12, 12') facing a suction chamber (28), - distributing superabsorbent granular material (14, 14') on a second surface (20) of said first non-woven layer (12, 12') opposite to said first surface (18), - volumizing said first non-woven layer (12, 12') by means of a toothed portion (38, 50) that penetrates into said first non-woven layer (12, 12') through said second surface (20) and movable with respect to said first non-woven layer (12, 12') with a speed difference (ΔV).