Absorbent Article Side Pocket Non-Bonded Gap Leakage Prevention
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Solution Overview
Problem
Existing absorbent articles face challenges in preventing leakage of excretion liquids over rising gathers, particularly when the liquid level on the top sheet reaches a certain point, as they require forming holes in the sheet to facilitate liquid flow into side pockets, which may not effectively prevent leakage.
Innovation Solution
The design incorporates a side pocket surrounded by a side cover portion with a non-bonded portion not bonded to the top sheet, allowing excretion liquids to flow into the side pocket without forming holes, and uses an elongated side cover elastic member and opening elastic member to secure and open the side pocket effectively, ensuring waterproof properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a hole is formed in the sheet to facilitate liquid flow into the side pocket, then the liquid flow is improved, but the waterproof integrity is compromised
Solution Approach 1:
The side cover portion is divided into a bonded portion (first region) and a non-bonded portion (second region). The bonded portion maintains waterproof integrity by being attached to the top sheet, while the non-bonded portion creates an open gap that facilitates liquid flow into the side pocket without requiring holes through the entire side cover structure.
Solution Approach 2:
Instead of creating a through-hole (one-dimensional penetration), the invention uses a non-bonded portion that creates a two-dimensional open gap between the side cover portion and the top sheet. This allows liquid to flow laterally into the side pocket while maintaining the waterproof barrier in the vertical dimension through the bonded portion.
2Stability of the object's composition
If the side pocket is fully bonded to the top sheet, then the structural stability is improved, but the liquid flow into the side pocket is blocked
Solution Approach 1:
The side cover portion is segmented into a bonded portion for structural stability and a non-bonded portion for liquid flow. This segmentation allows the side cover to maintain overall structural integrity while creating a specific region that facilitates liquid entry into the side pocket.
Solution Approach 2:
Different regions of the side cover portion have different bonding characteristics: the first region (bonded portion) is attached to the top sheet for stability, while the second region (non-bonded portion) remains unbonded to create an open gap for liquid flow. This local differentiation of bonding quality resolves the contradiction between stability and liquid flow.
3Reliability
If the rising gather is made higher to prevent leakage, then the leakage prevention is improved, but the liquid level reaches the tip more easily causing leakage
Solution Approach 1:
The side pocket acts as an intermediary structure that intercepts liquid before it reaches the rising gather. By providing an alternative path for liquid flow through the non-bonded portion of the side cover, the side pocket prevents liquid from accumulating on the top sheet and reaching the rising gather tip, thereby preventing leakage without requiring an excessively high rising gather.
Solution Approach 2:
The side pocket creates a secondary containment structure that replicates the leakage prevention function of the rising gather. Instead of relying solely on the rising gather to prevent leakage, the side pocket provides an additional leakage prevention mechanism by capturing liquid laterally, effectively copying the protective function in a different spatial location.
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 solution allows excretion liquids to flow into the side pocket regardless of the liquid level, preventing leakage over the rising gather without compromising the waterproof integrity of the side cover portion, thus enhancing the absorbency and leakage prevention in absorbent articles.
Implementation Method 1
a side cover elastic member extending in a front-back direction is disposed outside a portion located above the side pocket in a width direction in the side cover portion, and a portion having the side cover elastic member in the side cover portion is contracted in the width direction by a contraction force of the side cover elastic member
Implementation Method 2
an opening elastic member is disposed at a position overlapping with at least the non-bonded portion on a back surface side of the non-bonded portion in a thickness direction, and at least a portion overlapping with the non-bonded portion in a thickness direction in the top sheet and the side cover portion is contracted in a front-back direction by a contraction force of the opening elastic member
Implementation Method 3
The excretion liquid that has flowed into the side pocket is absorbed by an adjacent absorber
Data Source
AI summary
A flow of an excretion liquid into a side pocket is accomplished with a simple structure using an imperforated sheet. A side pocket extending in a front-back direction LD is disposed in an absorbent article on a lateral side of an absorber. The side pocket is surrounded by a side cover portion reaching the back surface side of the absorber from above a side of a top sheet via an upper portion, an outer side, and a lower portion of the side pocket. A portion located above the side of the top sheet in the side cover portion includes a non-bonded portion not bonded to the top sheet and a bonded portion located on both front and back sides of the non-bonded portion. A gap between the side cover portion and the top sheet in the non-bonded portion is open above the top sheet and toward the side pocket.