Flexible Absorbent Pad With Corrugated Core and Hinge Adhesive
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Solution Overview
Problem
Conventional superabsorbent pads lose flexibility when absorbing liquid, leading to discomfort for wearers due to irreversible deformation, necessitating frequent changes.
Innovation Solution
A flexible absorbent pad design featuring a corrugated absorbent core with flexure hinges and a specific adhesive pattern that maintains flexibility even after liquid absorption, combined with a liquid permeable topsheet and impermeable backsheet, allowing for minimal deformation and comfort.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the absorbent core absorbs liquid, then the absorption capacity is improved, but the flexibility is worsened due to irreversible deformation
Solution Approach 1:
The absorbent core is divided into multiple independent absorbent islands separated by flexible zones. Each island contains SAP particles and is surrounded by a flexible matrix material, allowing independent deformation of each segment while maintaining overall flexibility through the compliant zones between them.
Solution Approach 2:
The patent changes the physical parameters of the absorbent core by controlling the gel fraction of the polymer network between 5-50% and adjusting the ratio of absorbent material to flexible matrix material. This creates a semi-interpenetrating network that maintains flexibility while providing absorption capacity.
2Quantity of substance
If the laminate core is made thicker to increase absorption, then the absorption capacity is improved, but the flexibility is worsened
Solution Approach 1:
The patent applies local quality by creating regions of high absorption (absorbent islands with SAP particles) interspersed with regions of high flexibility (zones of compliant matrix material). This allows the core to have sufficient overall absorption capacity while local flexible zones maintain bendability and comfort.
Solution Approach 2:
The absorbent core uses a composite structure combining hydrophilic absorbent particles (SAP) with a hydrophobic flexible matrix material. This composite approach allows the thick core to maintain flexibility because the hydrophobic matrix provides mechanical compliance while the hydrophilic particles provide absorption function.
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 absorbent pad maintains flexibility and comfort by reducing the difference in flexural resistance between dry and wet states, ensuring it remains usable and comfortable even after absorbing large amounts of liquid.
Implementation Method 1
The absorbent core includes superabsorbent polymer (SAP) particles and extends across at least a portion of the absorbent pad between the topsheet and the backsheet
Implementation Method 2
a bottom of the absorbent core is bonded with a first adhesive to a top of the backsheet that faces the bottom of the absorbent core in the absorbent pad
Data Source
AI summary
A flexible absorbent pad has a dry thickness of between 2 mm and 10 mm and a difference in flexural-resistance between the dry state and the wet state of an absorbent center zone of the absorbent pad of less than 100 grams-force. The absorbent core of the pad may include an airlaid, a foam, or a fibrous staple filament. The absorbent core of the absorbent pad may be corrugated, such as with flexure hinges, in which case adhesive is applied to the backsheet of the absorbent pad in a pattern that leaves the flexure hinges devoid of adhesive so that the backsheet is attached to the absorbent core in a manner that does not impede the flexing of the flexure hinges.