Composite Sheet Elastic String Positioning

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Solution Overview

Problem

The challenge in manufacturing composite sheets for absorbent articles is the risk of erroneously cutting elastic strings during processing, particularly when forming through holes, crimping, welding, or fusion bonding, due to displacement of processing positions.

Innovation Solution

A method and apparatus that transport a first continuous sheet, a second continuous sheet, and an elastic string with the elastic string interposed between protruding parts of a rotatable first rotation body, and process the sheets by sandwiching them between a second rotation body and the protruding parts, restricting the elastic string's movement and reducing the likelihood of cutting during processing.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Object-affected harmful factors

If through holes are formed in the exterior member to improve permeability, then the permeability is improved, but the elastic string may be erroneously cut due to position displacement

Engineering Contradiction:

ImprovepermeabilityVSAvoidelastic string cutting risk

Core Design Contradiction:

Object-affected harmful factorsVSReliability

Solution Approach 1:

The exterior member is divided into multiple through holes that are formed at specific intervals. The through holes are segmented and distributed across the material, allowing permeability improvement while maintaining structural integrity and avoiding concentration of stress or processing errors in one location.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

A guide member is introduced as an intermediary component during the through-hole forming process. The guide member defines the exact position where through holes are formed, acting as a mediator between the processing tool and the exterior member, thereby preventing position displacement and erroneous cutting of the elastic string.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Strength

If processing such as crimping, welding, or fusion bonding is performed on the composite sheet, then the sheets are joined effectively, but the elastic string may be cut due to position displacement

Engineering Contradiction:

Improvejoining strengthVSAvoidelastic string cutting risk

Core Design Contradiction:

StrengthVSReliability

Solution Approach 1:

The elastic string is positioned and fixed between the first and second continuous sheets before the crimping, welding, or fusion bonding processes are performed. This preliminary positioning ensures that the elastic string remains in its correct location during subsequent processing operations, preventing erroneous cutting while allowing effective joining of the sheets.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The guide member serves as an intermediary that maintains the precise position of the elastic string during processing operations. By defining the spatial relationship between the elastic string and the processing tools, the guide member protects the elastic string from being cut while allowing the sheets to be joined effectively.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Ease of manufacture

If the elastic string is positioned between continuous sheets, then the composite sheet structure is formed, but the elastic string may move during transporting, leading to processing errors

Engineering Contradiction:

Improvecomposite sheet formationVSAvoidelastic string position stability

Core Design Contradiction:

Ease of manufactureVSStability of the object's composition

Solution Approach 1:

The guide member acts as an intermediary structure that physically constrains the elastic string between defined boundaries. This intermediary element prevents the elastic string from moving during transporting while still allowing the composite sheet to be formed effectively, maintaining both ease of manufacture and position stability.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The first and second continuous sheets function as flexible constraints that hold the elastic string in place. These thin film-like sheets provide sufficient constraint to prevent elastic string movement during transporting, yet remain flexible enough to allow easy formation of the composite sheet structure.

Inventive Principle:

Principle #30Flexible shells and thin films

Data Source

PatentEP3320885B1Method for producing composite sheet for absorbent article, apparatus for producing composite sheet for absorbent article, and composite sheet for absorbent article

Publication Date: 2020.03.11 UNI CHARM CORP

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AI summary

A method for manufacturing a composite sheet (20) of an absorbent article (1) to manufacture a composite sheet (20) including a first continuous sheet (21), a second continuous sheet (22), and an elastic string (23) to be arranged between the first continuous sheet (21) and the second continuous sheet (22), the method includes: transporting the first continuous sheet (21), the second continuous sheet (22), and the elastic string (23), in a state where the elastic string (23) arranged between the first continuous sheet (21) and the second continuous sheet (22) is at least partially interposed between first protruding parts (251) and second protruding parts (252), by causing a first rotation body (25) to rotate, the first rotation body (25) including the first protruding parts (251) and the second protruding parts (252) protruding radially outwardly; and performing processing to the first continuous sheet (21) and the second continuous sheet (22) by sandwiching the first continuous sheet (21) and the second continuous sheet (22) between a second rotation body (26) and the first protruding parts (251) and the second protruding parts (252), during transporting with the first rotation body (25).