Irregular Glue Stripe Bonding for Absorbent Core Fluid Handling
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Solution Overview
Problem
Existing absorbent articles with elongated channels in the core face challenges such as reduced fluid absorption capacity and kinetic absorption due to channel constraints, particularly in the crotch region where superabsorbent polymer (SAP) is concentrated, leading to slower liquid distribution and potential leakage.
Innovation Solution
The absorbent core features an irregular auxiliary glue pattern with varying bond strength along the elongated channels, comprising parallel glue stripes of different widths and gaps, ensuring higher bond strength in the front and crotch sections while maintaining a lower bond strength in the intermediate section to manage swelling pressure effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If channels are provided in the absorbent core to improve liquid distribution and flexibility, then liquid distribution is improved, but fluid absorption capacity and kinetic absorption are reduced
Solution Approach 1:
The channel bond strength is varied locally along the channel length, with stronger bonding in front and crotch sections and weaker bonding in intermediate sections. This local differentiation allows the channel to maintain structural integrity where needed while permitting controlled delamination in intermediate sections to preserve absorbent capacity and kinetic absorption properties.
2Stability of the object's composition
If channels are provided in the absorbent core to improve flexibility and reduce wet sagging, then flexibility is improved, but absorption kinetic is reduced
Solution Approach 1:
The channel bonding is designed with local quality variations, providing strong bonds in regions requiring structural stability (front and crotch sections) while using weaker bonds in intermediate sections. This allows the channel to maintain flexibility and reduce wet sagging in critical areas while minimizing interference with absorption kinetic in regions where controlled delamination occurs.
3Reliability
If uniform channel bonding is provided throughout the core, then channel durability is improved, but absorbent material utilization is reduced due to swelling pressure constraints
Solution Approach 1:
Instead of uniform bonding, the channel exhibits local quality variations in bond strength. The front and crotch sections have stronger bonding for durability, while intermediate sections have weaker bonding that allows controlled delamination. This resolves the contradiction by maintaining channel durability where structurally critical while permitting swelling pressure release in intermediate sections to improve absorbent material utilization.
Solution Approach 2:
The channel bonding is segmented into distinct regions with different bond strengths rather than being uniform. This segmentation into strongly bonded sections (front and crotch) and weakly bonded sections (intermediate) allows the channel to simultaneously achieve durability in critical areas and controlled delamination in non-critical areas, thereby improving overall absorbent material utilization.
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
This design enhances fluid handling and reduces leakage by allowing controlled delamination of the channel bond in the intermediate section, optimizing the use of absorbent material and improving overall absorption performance.
Implementation Method 1
The channel bonding can be achieved through adhesive bonding, thermo bonding, mechanical bonding, ultrasonic bonding, or a combination of these methods.
Implementation Method 2
The absorbent material has typically been a mixture of cellulose fibers and superabsorbent polymer particles (SAP)
Implementation Method 3
The superabsorbent polymer particles absorb and retain liquid through capillary action and osmotic pressure
Implementation Method 4
The channel bonding can be achieved through adhesive bonding, thermo bonding, mechanical bonding, ultrasonic bonding, or a combination of these methods.
Data Source
AI summary
A personal hygiene absorbent article (20) having a topsheet (24), a backsheet (25) and an absorbent core (28) between the topsheet and the backsheet, the absorbent core having a core wrap top layer (45), a core wrap bottom layer (46), an absorbent material layer (60) therebetween, wherein the absorbent layer includes one elongated absorbent material-free channel (26), and an auxiliary glue (70) disposed between the absorbent material and at least one of the core wrap top layer or bottom layer is presented. The channel has a channel bond (27) between the core wrap top layer (45) and the core wrap bottom layer (46), the channel bond is partially formed by the auxiliary glue (70), wherein the auxiliary glue includes a plurality of parallel auxiliary glue stripes, wherein two adjacent stripes are separated by a gap (86, 88). The auxiliary glue stripes have an irregular pattern.