Disposable Pant Diaper with Interrupted Elastic Threads and Adhesive Gradient
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Solution Overview
Problem
Existing disposable pant-type absorbent articles face challenges in manufacturing efficiency and user comfort, particularly in maintaining leakage protection and avoiding compression of the absorbent core due to elastic threads, which can lead to a gathering effect and poor visual appearance.
Innovation Solution
A disposable pant-type absorbent article with a laminated web material chassis featuring elastic threads that are interrupted in a central area, using a controlled adhesive gradient to prevent gathering and ensure a flat design, while maintaining comfort and fit, and reducing the risk of adhesive material soiling and delamination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If elastic threads are continuous across the front and back sections, then the article provides good fit and retraction, but the absorbent core is compressed and the visual appearance is poor due to gathering effect
Solution Approach 1:
The elastic threads are segmented into multiple sections along their length, with at least one section being discontinuous. This segmentation allows the elastic threads to provide retraction force in certain areas while avoiding compression in the central area where the absorbent core is located, thus resolving the contradiction between maintaining fit and preventing core compression
Solution Approach 2:
Different sections of the elastic threads have different continuity characteristics. The front and back sections may have continuous elastic threads for fit, while the central section has discontinuous threads to prevent compression. This local differentiation allows each area to have the specific elastic property needed for its function
2Strength
If adhesive material is applied extensively to secure elastic threads, then the bonding strength is improved, but the risk of adhesive material soiling and delamination increases
Solution Approach 1:
The adhesive material application is extracted from the central area where it would cause soiling problems. By limiting adhesive application to specific areas away from the center, the bonding strength is maintained where needed while eliminating the harmful soiling effect in the central region
Solution Approach 2:
Adhesive material is applied with varying distribution and intensity across different areas. Higher adhesive concentration is used in areas requiring strong bonding, while the central area has reduced or no adhesive application to prevent soiling, creating a localized quality distribution that addresses both bonding and soiling concerns
3Object-generated harmful factors
If the central area is completely free from adhesive material, then adhesive soiling is prevented, but the sheets of web material may delaminate
Solution Approach 1:
The adhesive distribution is optimized with local quality variations. The central area has minimal or no adhesive to prevent soiling, while adjacent areas have sufficient adhesive to secure the web material sheets together, preventing delamination without causing soiling
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 solution enhances manufacturing efficiency, reduces the risk of adhesive material soiling, and provides improved comfort and visual appearance by controlling the retraction of elastic threads and preventing compression of the absorbent core, resulting in a more effective and aesthetically pleasing product.
Implementation Method 1
A plurality of elastic threads extending from a location adjacent a first lateral side of the front and/or back section to a location adjacent an opposite lateral side of the front and/or back section
Implementation Method 2
A first adhesive material for securing the sheets of web material of the laminated web material to each other is applied in the region
Data Source
Figure 1~3
Figure 4~5
Figure 6
AI summary
The invention relates to a disposable pant-type absorbent article (1) such as a pant diaper, a sanitary pant or incontinence pant, having a longitudinal direction (Y) and a transverse direction (X). Said disposable pant-type absorbent article comprises: a chassis made of laminated web material and having a front section (3) and a back section (4), an absorbent insert (2) located mainly in a crotch portion of the absorbent article (1) and connected to the front and back sections (3, 4) and having an absorbent core (5), wherein a region (31, 23) of the front and/or back section (3, 4) is made of a laminated elastic web material comprising a plurality of elastic threads extending from a location adjacent a first lateral side of the front and/or back section (3, 4)to a location adjacent an opposite lateral side of the front and/or back section (3, 4), wherein said elastic threads are interrupted in a central area of the absorbent article (1), wherein a first adhesive material (44) primarily for securing sheets of web material of the laminated web material to each other is applied in the region from a location adjacent a first lateral side of the front and/or back section (3, 4) to a location adjacent an opposite lateral side of the front and/or back section (3, 4), while leaving a first gap (55) in the central area of the absorbent article free from the first adhesive (44), wherein a second adhesive material (43) primarily for securing the elastic threads to the sheets of laminated web material is applied in the region from a location adjacent a first lateral side of the front and/or back section (3, 4) to a location adjacent an opposite lateral side of the front and/or back section (3, 4), while leaving a second gap (58) in the central area of the absorbent article (1) free from the second adhesive material, and wherein a width (56) of the first gap (55) in the direction (X) is smaller than a width (60) of the second gap (58) in the transverse direction (X), such that an adhesive gradient is provided in the region (31, 32) as seen from a centre of the absorbent article (1) towards the lateral edges of the absorbent article (1).