Absorbent Article Elastic Film Non-Stretchable Region Design
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Solution Overview
Problem
Existing absorbent articles with elastic film stretchable structures face challenges in creating a non-stretchable region without degrading appearance, flexibility, or increasing air permeability, particularly when attempting to eliminate elasticity by cutting elastic films, which can lead to unintended cuts in the sheet layers and reduced manufacturing efficiency.
Innovation Solution
The introduction of a non-stretchable region in an elastic film stretchable structure, where the elastic film does not linearly continue along the stretching and contracting direction, with through holes arranged in a staggered pattern to eliminate linear continuity and maintain elastic film continuity, while increasing the area rate of sheet bond portions to reduce elasticity, and using welding patterns to form perforations that fracture and eliminate elasticity without leaving cut pieces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the elastic film is cut to eliminate elasticity in the non-stretchable region, then the elasticity is removed, but the first sheet layer and the second sheet layer may be cut or cutting traces are left, degrading appearance and flexibility
Solution Approach 1:
The elastic film is segmented into discontinuous portions through through-holes arranged in a specific pattern, eliminating the need for continuous cutting. The through-holes are positioned such that they disconnect the elastic film in the stretching direction while maintaining sheet layer integrity, thus removing elasticity without cutting the sheet layers.
Solution Approach 2:
The through-holes act as intermediaries to eliminate elasticity. Instead of directly cutting the elastic film and risking damage to sheet layers, the through-holes serve as a mediating structure that disconnects the elastic film's continuity, achieving elasticity elimination while protecting the sheet layers from direct cutting damage.
2Stability of the object's composition
If continuous cutting is performed in a large area to eliminate elasticity, then the non-stretchable region is formed, but manufacturing complexity increases and efficiency decreases
Solution Approach 1:
The elastic film is prepared in advance with through-holes formed at specific positions before the elasticity elimination process. This preliminary arrangement of through-holes in a discontinuous pattern allows the elasticity to be eliminated without requiring subsequent continuous cutting operations, significantly improving manufacturing efficiency.
Solution Approach 2:
The mechanical cutting process is replaced by a through-hole formation process. Instead of using cutting tools to physically sever the elastic film across a large area, the invention uses through-holes (formed by punching, drilling, or other methods) to achieve the same elasticity elimination effect with simpler, more efficient manufacturing operations.
3Stability of the object's composition
If the area rate of sheet bond portions is increased to reduce elasticity, then the non-stretchable region is enhanced, but the flexibility and appearance may be degraded
Solution Approach 1:
The sheet bond portions are strategically positioned and sized to provide localized elasticity control. By arranging sheet bond portions at specific locations and optimizing their area, the invention achieves elasticity elimination in the non-stretchable region while maintaining flexibility in other areas. The local optimization of sheet bond portion distribution prevents overall flexibility degradation.
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 effectively forms a non-stretchable region with enhanced appearance, maintained flexibility, and improved air permeability by eliminating elasticity while preventing degradation and ensuring efficient manufacturing of absorbent articles.
Implementation Method 1
an elastic film stretchable structure in which an elastic film is stacked between a first sheet layer and a second sheet layer... the stretchable region is contracted in the stretching and contracting direction by a contraction force of the elastic film while it is possible that the stretchable region is stretched in the stretching and contracting direction
Implementation Method 2
performing a welding process in a welding pattern of one row extending in a dotted line in the CD or a plurality of rows, each of which is extending in a dotted line in the CD, and which are disposed at intervals in the MD, to melt the elastic film in the welding pattern of the dotted line, thereby forming perforation
Implementation Method 3
fracturing the perforation by a tensile force applied by stretching of the elastic film
Data Source
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AI summary
In order to prevent degradation of appearance, prevent a decrease in flexibility, and improve non-elasticity in a non-stretchable region in an elastic film stretchable structure, the invention is characterized by having an elastic film stretchable structure (20X) formed by stacking an elastic film (30) between a first sheet layer (20A) and a second sheet layer (20B), wherein a region having the elastic film stretchable structure (20X) includes a non-stretchable region (70) and a stretchable region (80) provided at least at one side of the non-stretchable region (70) in a stretching and contracting direction, the stretchable region (80) being stretchable in the stretching and contracting direction, the first sheet layer (20A) and the second sheet layer (20B) are joined via through holes (31) penetrating the elastic film (30) at the large number of sheet bond portions (40) arranged at intervals, and the non-stretchable region (70) does not have a section in which the elastic film (30) linearly continues along the stretching and contracting direction, due to presence of the through holes (31), even though the elastic film (30) continues in the stretching and contracting direction.