Diaper Edge Sections Draw Processing Extensibility
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Solution Overview
Problem
Conventional disposable diapers have edge sections that are inextensible, leading to discomfort and constriction when moved, limited size range, and high manufacturing costs due to material inefficiency.
Innovation Solution
The method involves disposing elastic members in a stretched state on sheets and subjecting the disposition sections to draw processing in the stretching direction of the elastic members, allowing for increased extensibility and reduced material usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If edge sections are made inextensible using conventional nonwoven fabric, then structural stability is improved, but wearer comfort deteriorates due to constriction and discomfort during movement
Solution Approach 1:
The patent applies draw processing to change the physical parameters of the sheet material in the edge sections. This processing increases the extensibility of the material by modifying its fiber structure and arrangement, allowing the edge sections to stretch with the wearer's body movements while maintaining structural integrity. The draw processing creates a more flexible material structure that can expand and contract without constriction.
Solution Approach 2:
The patent applies different properties to different parts of the diaper structure. Specifically, the edge sections are subjected to draw processing to give them localized extensibility, while other parts of the diaper maintain their original structural properties. This local modification allows the edge sections to be more compliant and comfortable against the wearer's skin while the rest of the diaper maintains its structural stability.
2Ease of manufacture
If conventional inextensible sheets are used for edge sections, then manufacturing simplicity is improved, but adaptability deteriorates due to limited size range
Solution Approach 1:
The draw processing modifies the physical parameters of the sheet material to increase extensibility. This parameter change allows the same diaper design to accommodate a wider range of sizes, as the edge sections can stretch to fit different body dimensions. The processing creates material that can dynamically adjust its dimensions within certain limits.
Solution Approach 2:
The patent introduces dynamic properties to the edge sections through draw processing. The material becomes capable of changing its dimensions in response to wearer movement and size variations. This dynamic extensibility allows a single diaper design to adapt to multiple size requirements, improving versatility without requiring multiple fixed-size models.
3Quantity of substance
If conventional inextensible sheets are used, then material usage efficiency is improved, but productivity deteriorates due to high manufacturing costs
Solution Approach 1:
The draw processing changes the material properties to create extensible edge sections. This processing allows for more efficient material utilization by enabling the edge sections to provide the required functionality with less material. The processed material has improved mechanical properties that allow thinner or lighter construction while maintaining performance.
Solution Approach 2:
The draw processing creates a flexible, thin-film-like structure in the edge sections that provides extensibility. This flexible structure allows the diaper to conform to the wearer's body more efficiently, reducing the amount of material needed while improving fit and comfort. The processed material acts as a flexible shell that can stretch and adapt.
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 approach enables a wider range of size application, improved comfort by reducing constriction, and lower manufacturing costs while using less material, making the product more environmentally friendly.
Implementation Method 1
a method is generally used in which string-shaped or band-shaped elastic members in their stretched state are fixed between two substantially non-stretchable sheets via an adhesive, and gathers are formed by allowing the elastic members to shrink
Implementation Method 2
a drawing step in which a band-shaped sheet whose stretchability can be increased by drawing is fed between a pair of toothed rollers having teeth and grooves meshed with each other and is drawn in the width direction, thus increasing the widthwise stretchability of the band-shaped sheet
Implementation Method 3
string-shaped or band-shaped elastic members in their stretched state are fixed between two substantially non-stretchable sheets via an adhesive
Data Source
Figure 1A~2
Figure 3~5
Figure 6
AI summary
A wearing article (1) of the invention has edge sections (leg edge sections and waist edge section) configured including sheets. On the sheets in the edge sections, elastic members (6, 7, 8) are disposed in their stretched state along the edge sections. Draw-processed sections (P1, P2) are formed by performing draw processing, in the stretching direction of the elastic members (6, 7, 8), on the disposition sections of the sheets where the elastic members (6, 7, 8) have been disposed. Furthermore, a draw-processed section (P3) is formed by performing draw processing, in the stretching direction of an elastic member (5), on the disposition section of a band-shaped sheet (15), which configures three-dimensional gathers (18), where the elastic member (5) has been disposed.