Multi-Layer Cushion Layer for Reduced Grittiness in Absorbent Articles
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Solution Overview
Problem
Absorbent articles with high superabsorbent polymer content and minimal cellulose fibers can result in a gritty feeling due to the hardness of the superabsorbent particles, which is undesirable for user comfort.
Innovation Solution
A cushion layer with multiple sub-layers, featuring varying widths and attachment patterns, is introduced between the absorbent core and the backsheet to enhance cushioning and flexibility, while minimizing material usage and maintaining comfort.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a high proportion of superabsorbent polymers is used in the absorbent core with little or no cellulose fibers, then absorbency is improved, but a gritty feeling occurs due to the hardness of superabsorbent particles
Solution Approach 1:
A cushion layer is introduced as an intermediary component between the absorbent core containing superabsorbent polymers and the backsheet. This cushion layer masks the gritty feeling of the SAP particles while allowing the high absorbency to be maintained, as it provides a soft tactile interface without interfering with the absorbency function.
Solution Approach 2:
The cushion layer is made from a soft, nonwoven material that is disposable along with the entire absorbent article. This allows the use of a material optimized purely for comfort (softness) without needing to balance durability or reusability, effectively masking the gritty feeling for the duration of use.
2Object-affected harmful factors
If a cushion layer is added between the absorbent core and the backsheet to reduce gritty feeling, then comfort is improved, but material usage and cost increase
Solution Approach 1:
The cushion layer is designed with spatially varying basis weight, having a higher basis weight in the longitudinally-extending central area where comfort is most needed, and lower basis weight in the lateral areas. This local differentiation provides targeted comfort improvement while reducing overall material usage compared to a uniformly thick cushion layer.
Solution Approach 2:
The cushion layer is constructed from multiple sub-layers (at least two) that can be stacked or formed by folding. This segmentation allows the cushion layer to achieve the desired comfort properties in specific areas while using less material overall, as the sub-layers can be strategically positioned and bonded only where necessary.
3Strength
If multiple sub-layers are attached along their entire interface to ensure structural integrity, then strength is improved, but flexibility deteriorates
Solution Approach 1:
The sub-layers of the cushion layer are attached to each other only along a central longitudinally-extending attachment area, leaving lateral non-attachment areas unbonded. This partial bonding provides sufficient structural integrity to prevent delamination while maintaining flexibility in the unbonded lateral regions, allowing the article to conform to the wearer's body.
Solution Approach 2:
The cushion layer is divided into multiple sub-layers that are partially bonded together. This segmentation allows different regions of the cushion layer to have different degrees of flexibility - the bonded central area provides structural stability while the unbonded lateral areas provide flexibility and conformability.
Data Source
AI summary
An absorbent article comprises a liquid-permeable topsheet, a liquid-impermeable backsheet, an absorbent core and a cushion layer between the absorbent core and the backsheet. The cushion layer comprises at least two sub-layers. The sub-layers advantageously have different widths or are bonded to each other by one or more longitudinally-extending attachment areas.