Leak-Proof Cuff Surface Texture for Absorbent Article Comfort
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Solution Overview
Problem
Existing pull-on absorbent articles, such as disposable diapers, face issues with leak-proof cuffs that can easily catch legs or caregiver's hands and may turn outward, leading to ineffective leakage protection and increased caregiver burden during diaper changes.
Innovation Solution
The design incorporates leak-proof cuffs made of nonwoven fabric with specific surface roughness and friction characteristics, ensuring the cuffs feel comfortable and are less likely to turn outward. The cuffs are formed with two layers of nonwoven fabric facing each other, with an elastic member fixed between them to create an elasticized region that helps maintain the cuff's position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the leak-proof cuff is made of gathered nonwoven fabric that rises on elastic member contraction, then the cuff provides effective leakage protection, but the free edge portion may catch legs or caregiver's hands and turn outward
Solution Approach 1:
The patent changes the surface parameters of the cuff by embossing the free edge portion to create a softened surface with reduced friction. This modification allows the cuff to maintain its leakage protection function while reducing the likelihood of catching on legs or hands during diaper changes
Solution Approach 2:
Instead of making the cuff surface smoother through conventional means, the patent applies embossing to create a textured surface that paradoxically reduces friction and prevents catching. The embossed pattern changes the surface interaction properties to achieve the desired effect
2Reliability
If the leak-proof cuff is made of gathered nonwoven fabric, then the cuff can rise to provide leakage protection, but the cuff may turn outward reducing its effectiveness
Solution Approach 1:
The embossing process changes the physical parameters of the free edge portion, creating a softened surface that maintains better positional stability. The embossed structure prevents the cuff from turning outward by modifying how the fabric edges interact with surrounding surfaces
3Ease of operation
If the free edge portion of the cuff is embossed to be softened, then the cuff feels comfortable and is less likely to turn outward, but the manufacturing process becomes more complex
Solution Approach 1:
The patent combines the embossing process with the existing diaper manufacturing workflow. The embossing is integrated into the production line as part of the cuff formation process, merging multiple functions into a unified manufacturing sequence that minimizes additional complexity
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 the leak-proof performance by preventing the cuffs from turning outward, improving comfort, and reducing the likelihood of the cuffs catching on legs or hands, thus simplifying the diaper-changing process and maintaining effective leakage protection.
Implementation Method 1
an elastic member (63) adhesively fixed in its stretched state between the two layers of nonwoven fabric (60, 60) to extend in the longitudinal direction (X) near along the free edge (61)
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
A pull-on absorbent article 1 has a pair of leak-proof cuffs 6. Each leak-proof cuff 6 is formed of nonwoven fabric 60 and has a free edge 61 and a fixed edge 62 as opposite lateral edges. Each leak-proof cuff 6 has a fixed end portion 65 fixed to a topsheet 5 near each longitudinal end thereof. Each leak-proof cuff 6 has an elasticized region 64 having an elastic member 63 fixed along near the free edge 61. A first distance D1 from the fixed edge 62 to the elasticized region 64 is 10 mm or longer. A second distance D2 from the elasticized region 64 to the fixed end portion 65 is equal to or smaller than the D1 in at least one of a front portion F and a rear portion R. The nonwoven fabric 60 has a surface roughness mean deviation (SMD) of 2.2 µm or less and a friction coefficient mean deviation (MMD) of 0.012 or less.