Newborn Diaper Core Recess and Channel Sealing
Solution Overview
Problem
Conventional disposable absorbent articles, such as diapers, often fail to provide optimal comfort and fit, especially around the navel area of newborn and young children, leading to potential sagging of the crotch portion when wet.
Innovation Solution
The absorbent article features an absorbent core with a recess in the front portion and channel sealings in the crotch portion, which are designed to maintain the core's stiffness and correct positioning, using a specific ratio of recess depth to distance from the core edge and channel sealing widths to distribute absorbent material effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the absorbent core is made with sufficient material to ensure absorption capacity, then the absorption performance is improved, but the crotch portion becomes too soft and sags when wet
Solution Approach 1:
The absorbent core is segmented into different zones with varying material densities and compositions. The crotch portion contains a lower density absorbent material or reduced material quantity compared to the front and back portions, allowing it to maintain stiffness while still providing absorption. This segmentation resolves the contradiction by localizing absorption capacity where needed while preserving structural integrity in the crotch area.
Solution Approach 2:
Different regions of the absorbent core are assigned different material properties. The crotch portion specifically uses materials with lower fluffiness or higher structural support characteristics, while other areas use more aggressive absorbent materials. This local quality differentiation allows the crotch to resist sagging while maintaining overall absorption performance throughout the diaper.
2Quantity of substance
If the absorbent core material is increased to improve absorption, then the absorption capacity is improved, but the fit and comfort around the navel area deteriorates
Solution Approach 1:
The absorbent core is divided into functional zones with the front portion (near navel) containing less absorbent material or material with different properties compared to the crotch and back portions. This segmentation allows adequate absorption in high-flow areas while maintaining a thinner, more comfortable profile around the sensitive navel region.
Solution Approach 2:
The front portion of the absorbent core uses materials with different characteristics - potentially lower basis weight, different fiber composition, or reduced fluffiness - to provide a softer, more comfortable interface with the baby's skin around the navel, while other areas use higher capacity materials for maximum absorption.
3Ease of operation
If the crotch portion is made softer to improve comfort, then the comfort is improved, but the sagging risk increases
Solution Approach 1:
The crotch portion incorporates materials with specific structural properties - such as bonded fibers, cross-linked structures, or materials with higher tensile strength - that provide stiffness and sag resistance while maintaining softness against the skin. This local quality optimization allows the crotch to be comfortable yet stable.
Solution Approach 2:
The crotch portion uses composite material structures combining different fiber types, bonded layers, or material combinations that provide both softness for comfort and structural integrity to prevent sagging. The composite structure allows simultaneous achievement of comfort and stability that single materials cannot provide.
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 the comfort and fit of absorbent articles by maintaining the crotch portion's stiffness and preventing sagging, even when wet, thereby improving overall performance and user experience.
Implementation Method 1
the core is formed with a sealing arrangement for joining said upper and lower sides comprising two channel sealings extending along said longitudinal axis in said crotch portion
Implementation Method 2
Such articles are used to absorb, distribute and store body exudates
Implementation Method 3
the fluid which is released into the absorbent core can contribute to a sufficiently stiff crotch portion of the core (in the wet condition of the article), to reduce the risk for sagging of the crotch portion of the article during use
Data Source
AI summary
The present disclosure relates to an absorbent article (1) comprising an absorbent core (5) sandwiched between a topsheet (3) and a backsheet (4), said article (1) being arranged along a longitudinal axis (y1) and a transversal axis (x1 ) extending in a perpendicular direction in relation to the longitudinal axis (y1 ) and said article (1) defining a front portion (6), a back portion (7) and a crotch portion (8), wherein said absorbent core (5) comprises an absorbent component (5a, 5b, 5c) enclosed by a core cover (11, 12) comprising an upper and a lower side (11, 12) and the core (5) is formed with a sealing arrangement (9, 10) for joining said upper and lower sides (11, 12) comprising two channel sealings (9, 10) extending along said longitudinal axis (y1) in said crotch portion (8) and defining a first channel sealing width (w1 ) and a second channel sealing width (w2), respectively. Furthermore, the front portion (6) of the core (5) is formed with a recess (27) defining a depth (c) extending from a front edge (28) of the core (5) and into said front portion (6) and that a distance (12) is defined between said front edge (28) of the core (5) and a front edge (20) of each channel sealing (9, 10), wherein the ratio of said depth (c) and said distance (I2) is within the interval 0,05-0,8. The invention also relates to an absorbent core (5) and a method for manufacturing an absorbent article (1).