Disposable Pull-On Diaper Interior Elastic Sheet Attachment
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Solution Overview
Problem
Existing disposable pull-on diapers face challenges in manufacturing, particularly with the attachment of waist elastics, which can lead to large openings and disordered cut ends, and are not suitable for belt-like waist elastics with large widths.
Innovation Solution
A disposable pull-on diaper design featuring a central inelastic region between lateral elastic regions, with elastically stretchable interior sheets attached under tension to the exterior sheet, and a manufacturing method involving continuous feeding and cutting of webs to form elastic and inelastic regions, ensuring the central inelastic region is formed on the exterior side of the absorbent chassis without gathers or creases.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If waist elastics are attached under tension to a region with no absorbent body present and cut without being attached to the absorbent body region, then elasticity develops in the waist region, but large openings and disordered cut ends are formed requiring additional shield sheets
Solution Approach 1:
The diaper is divided into a first waist region (with absorbent body) and a second waist region (without absorbent body). Waist elastics are selectively attached to the second waist region only, creating distinct functional zones that eliminate the need for shield sheets while maintaining elasticity where needed.
Solution Approach 2:
Different regions of the diaper are given different properties: the second waist region has elastic properties due to attached waist elastics, while the first waist region maintains structural integrity with the absorbent body. This localized differentiation allows elasticity development without creating large openings requiring additional coverage.
2Extent of automation
If waist elastics are interposed between exterior sheets and secured with heat and pressure processing, then the manufacturing process can be automated, but the method is not applicable to belt-like waist elastics with large width dimensions
Solution Approach 1:
The attachment method transitions from static heat and pressure processing to a dynamic cutting-based approach. By cutting the waist elastics to appropriate lengths and attaching them to the second waist region, the system can accommodate various widths including belt-like elastics, while still allowing for automated manufacturing through controlled cutting and adhesive application.
Solution Approach 2:
The invention changes the attachment parameters by using adhesive bonding instead of heat and pressure processing. This parameter change allows the system to handle belt-like waist elastics with large width dimensions that would be difficult or impossible to process using traditional heat and pressure methods.
3Reliability
If interior sheets are made elastically stretchable and attached under tension to the exterior sheet in lateral elastic regions, then the diaper provides effective waist elasticity, but the interior sheets must be spaced apart in the central inelastic region requiring precise manufacturing control
Solution Approach 1:
The interior sheets are extracted from the central inelastic region, creating spacing between them only where needed. This selective removal allows the interior sheets to be attached under tension in the lateral elastic regions for effective waist elasticity, while maintaining the necessary spacing in the central inelastic region through controlled manufacturing processes.
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 prevents the formation of large openings and disordered cut ends, allows for the use of belt-like waist elastics, and maintains a smooth exterior appearance while ensuring effective elastic functionality.
Implementation Method 1
an interior sheet which lies on an interior surface side of the exterior sheet and is elastically stretchable in the transverse direction. The interior sheets are contractibly attached under tension to the interior surface of the exterior sheet in the lateral elastic regions
Data Source
AI summary
A disposable pull-on diaper having a central inelastic region in at least one of a front waist region and a rear waist region, and a method for manufacturing the same. Front and rear waist regions of a disposable pull-on diaper are respectively of an elastically non-stretchable exterior sheet and elastically stretchable interior sheets. In lateral elastic regions of this waist region, the interior sheets are attached under tension to an interior surface of the exterior sheet and, in a central inelastic region, the interior sheets are spaced apart from each other in a transverse direction and regions of the interior sheets are in an elastically contracted and relaxed state in vicinities of the lateral elastic regions.