Disposable Diaper Folded Absorbent Edge Design

Solution Overview

Problem

Conventional disposable diapers without end holding sheets can irritate the wearer's skin due to exposed edges of the absorbent body, while those with end holding sheets may have a harder waist texture, reduced air permeability, and increased manufacturing costs.

Innovation Solution

A pants-type disposable diaper design featuring a folded outer covering sheet with a sheet-like absorbent body that includes a back sheet and top sheet, where one end portion is folded inward and bonded to prevent skin irritation, and an elastic member is used to gather the absorbent body, ensuring the edges are not in contact with the skin.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Object-affected harmful factors

If end holding sheets are used to cover the absorbent body edges, then skin irritation is prevented, but waist texture becomes hard and air permeability decreases

Engineering Contradiction:

Improveskin irritationVSAvoidhard waist texture and reduced air permeability

Core Design Contradiction:

Object-affected harmful factorsVSObject-generated harmful factors

Solution Approach 1:

The invention extracts and eliminates the end holding sheets from the diaper structure. Instead of using separate end holding sheets to cover the absorbent body edges, the patent folds the top sheet and back sheet over the absorbent core edges to create a self-contained structure that prevents skin irritation without requiring additional components that would compromise breathability and softness.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The invention merges the function of end holding sheets with the existing top sheet and back sheet. By folding the top sheet and back sheet over the absorbent core edges, the patent combines multiple functions (containment, coverage, and edge management) into the existing sheet structure, eliminating the need for separate end holding sheets while maintaining skin protection.

Inventive Principle:

Principle #5Merging (Combining)

2Object-affected harmful factors

If end holding sheets are used to cover the absorbent body edges, then skin irritation is prevented, but manufacturing cost increases

Engineering Contradiction:

Improveskin irritationVSAvoidmanufacturing cost

Core Design Contradiction:

Object-affected harmful factorsVSEase of manufacture

Solution Approach 1:

The invention extracts and eliminates the end holding sheets from the diaper structure. Instead of using separate end holding sheets to cover the absorbent body edges, the patent folds the top sheet and back sheet over the absorbent core edges to create a self-contained structure that prevents skin irritation without requiring additional components that would increase manufacturing cost.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The invention merges the function of end holding sheets with the existing top sheet and back sheet. By folding the top sheet and back sheet over the absorbent core edges, the patent combines multiple functions (containment, coverage, and edge management) into the existing sheet structure, eliminating the need for separate end holding sheets while maintaining skin protection.

Inventive Principle:

Principle #5Merging (Combining)

3Ease of manufacture

If the absorbent body edges are exposed, then manufacturing is simpler, but skin irritation occurs when edges curl up

Engineering Contradiction:

Improvemanufacturing simplicityVSAvoidskin irritation from exposed edges

Core Design Contradiction:

Ease of manufactureVSObject-affected harmful factors

Solution Approach 1:

The invention applies preliminary action by folding the top sheet and back sheet over the absorbent core edges during the manufacturing process. This preliminary folding action prevents the edges from curling up and contacting the wearer's skin during use, eliminating skin irritation before it can occur without adding complex assembly steps.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The top sheet and back sheet serve dual functions: they provide the necessary containment layers and simultaneously act as edge covers to prevent skin irritation. The structure is self-sufficient, where the existing sheets perform multiple functions including edge management, eliminating the need for separate end holding sheets.

Inventive Principle:

Principle #25Self-service

Data Source

PatentEP2588053B1Disposable diaper

Publication Date: 2020.01.15 LIVEDO CORP

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AI summary

An outer covering sheet (4) of a pants-type disposable diaper (1) has a front part and a back part (403) to be positioned on a front side and a back side of a wearer, and a middle part lying between the both. An absorbent body (20) is attached on the outer covering sheet (4), to absorb excrement from the wearer. In the absorbent body (20), both end portions positioned in the front part and the back part (403) are folded toward the inner surface (40) of the outer covering sheet (4) to be bonded on the inner surface (40). It is therefore possible to prevent skin of the wearer from being irritated by edges (241) of the both end portions of the absorbent body (20) when the disposable diaper (1) is worn.