Absorbent Layer With Central Depression For Disposable Wearing Articles

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Solution Overview

Problem

Existing absorbent layers for disposable wearing articles, such as diapers, face issues with increased manufacturing costs and complexity due to the need for additional core supporting members, leading to discomfort and leakage caused by stiffness differences between regions.

Innovation Solution

An absorbent layer with a central depression and high density zones on both sides, formed from fluff wood pulp and superabsorbent polymer particles, is created using a process involving rotary suction drums and press-working stations to achieve uniform mass distribution and varying densities, allowing for improved fit and absorption without additional members.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Stability of the object's composition

If core supporting members are provided on the non-skin-facing side of the absorbent core, then the absorbent layer maintains shape and prevents twisting, but the manufacturing cost increases and the manufacturing process becomes more complicated

Engineering Contradiction:

Improveshape retentionVSAvoidmanufacturing process complexity

Core Design Contradiction:

Stability of the object's compositionVSDevice complexity

Solution Approach 1:

The invention extracts the shape retention function from separate core supporting members and integrates it into the absorbent core itself by forming a recessed portion. This eliminates the need for additional supporting members while maintaining the shape retention function, thereby reducing manufacturing complexity and cost.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The invention merges the shape retention function with the absorbent core structure by forming a recessed portion within the core itself. This integration combines multiple functions (absorption and shape retention) into a single component, eliminating the need for separate core supporting members and simplifying the manufacturing process.

Inventive Principle:

Principle #5Merging (Combining)

2Stability of the object's composition

If core supporting members are located on the non-skin-facing side, then stiffness is locally varied in the crotch region, but the stiffness value becomes significantly higher in the front and rear regions causing the absorbent core to fold and create discomfort

Engineering Contradiction:

Improvelocal stiffness variationVSAvoiddiscomfort and leakage

Core Design Contradiction:

Stability of the object's compositionVSObject-affected harmful factors

Solution Approach 1:

The invention applies local quality by forming a recessed portion specifically in the crotch region of the absorbent core, creating a localized area of reduced stiffness. This allows the crotch region to deform comfortably against the wearer's body while the front and rear regions maintain sufficient stiffness, eliminating the harmful folding and discomfort issues.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

Instead of increasing stiffness in the front and rear regions to prevent folding, the invention inverts the approach by creating a recessed portion in the crotch region to allow controlled deformation. This inversion of the stiffness distribution strategy resolves the contradiction between maintaining overall stiffness and allowing local comfort.

Inventive Principle:

Principle #13The other way round (Inversion)

3Stability of the object's composition

If additional members are added to support the absorbent core, then the absorbent layer maintains its shape, but the manufacturing cost increases

Engineering Contradiction:

Improveshape maintenanceVSAvoidmanufacturing cost

Core Design Contradiction:

Stability of the object's compositionVSEase of manufacture

Solution Approach 1:

The invention extracts the shape maintenance function from separate core supporting members and embeds it within the absorbent core structure through a recessed portion. This eliminates the need for additional members, thereby maintaining shape while reducing manufacturing cost.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The absorbent core serves itself by incorporating a recessed portion that provides shape maintenance functionality. This self-service approach eliminates the need for separate supporting members, reducing component count and manufacturing cost while maintaining the required shape stability.

Inventive Principle:

Principle #25Self-service

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 simplifies the manufacturing process, reduces costs, and ensures a stable, comfortable fit by maintaining the absorbent core's uniform mass distribution while allowing for regular deformation of the crotch region, preventing leakage and enhancing absorption performance.

Implementation Method 1

rotary suction drums and press-working stations to achieve uniform mass distribution

Methodology Applied

Scientific EffectSuction: Suction

Implementation Method 2

press-working stations to achieve uniform mass distribution and varying densities

Methodology Applied

Scientific EffectCompression: Compression

Implementation Method 3

absorbent core formed from at least one of fluff wood pulp and superabsorbent polymer particles

Methodology Applied

Scientific EffectAbsorption: Absorption (physical)

Implementation Method 4

absorbent core formed from at least one of fluff wood pulp and superabsorbent polymer particles

Methodology Applied

Scientific EffectCapillary action: Capillary Action

Data Source

PatentUS9271881B2Absorbent layer for disposable wearing article and method for making the same

Publication Date: 2016.03.01 UNI CHARM CORP

AI summary

An absorbent layer has a front section lying on the side of a front waist region, a rear section lying on the side of a rear waist region and an intermediate section lying between the front and rear sections. The absorbent layer is formed in the intermediate section with a central depression extending in a longitudinal direction Y and a high density zones having density higher than those of the front and rear sections are formed on both sides of the central depression.