Absorbent Article Wrapping Seal Structure Without Heat Fusion

Solution Overview

Problem

Wrapping sheets made of refractory materials or with refractory layers face challenges in achieving sufficient seal strength through heat fusion, leading to inadequate bonding of edge portions.

Innovation Solution

The design incorporates a seal portion with compressed recesses and projections along the folding direction, allowing for secure bonding without heat fusion, using a wrapping sheet that can be made of various materials, including refractory materials.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Strength

If heat fusion is used to seal the wrapping sheet, then seal strength is improved, but refractory materials cannot be used for the wrapping sheet

Engineering Contradiction:

Improveseal strengthVSAvoidmaterial selection

Core Design Contradiction:

StrengthVSAdaptability or versatility

Solution Approach 1:

The patent replaces the thermal sealing mechanism (heat fusion) with a mechanical sealing mechanism (compression). The seal portion is formed by compressing the wrapping sheet between a pressurizing member and the folded edge, creating sealed compressed portions without requiring the material to be heat-fusible. This allows refractory materials and other non-heat-fusible materials to be used while still achieving adequate seal strength.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Adaptability or versatility

If refractory material is used for the wrapping sheet, then material versatility is improved, but seal strength deteriorates when using heat fusion

Engineering Contradiction:

Improvematerial selectionVSAvoidseal strength

Core Design Contradiction:

Adaptability or versatilityVSStrength

Solution Approach 1:

The patent replaces the thermal sealing mechanism (heat fusion) with a mechanical sealing mechanism (compression). The seal portion is formed by compressing the wrapping sheet between a pressurizing member and the folded edge, creating sealed compressed portions without requiring the material to be heat-fusible. This allows refractory materials and other non-heat-fusible materials to be used while still achieving adequate seal strength.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Strength

If heat fusion process is used, then seal strength is improved, but manufacturing complexity and cost increase

Engineering Contradiction:

Improveseal strengthVSAvoidmanufacturing process complexity

Core Design Contradiction:

StrengthVSDevice complexity

Solution Approach 1:

The patent replaces the thermal sealing mechanism (heat fusion) with a mechanical sealing mechanism (compression). The seal portion is formed by compressing the wrapping sheet between a pressurizing member and the folded edge, creating sealed compressed portions without requiring the material to be heat-fusible. This allows refractory materials and other non-heat-fusible materials to be used while still achieving adequate seal strength.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The wrapping sheet's own compressibility and structural properties are utilized to create the seal. The compression process directly forms the sealed compressed portions by deforming the material itself, without requiring external heat energy or complex thermal processing equipment. This simplifies the manufacturing process and reduces costs.

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

This configuration provides an individually wrapped absorbent article with sufficient seal strength, enabling the use of a wider range of materials and simplifying the manufacturing process by eliminating the need for heat fusion, thus reducing complexity and costs.

Implementation Method 1

a seal portion is formed at each edge portion in a second direction of the wrapping sheet. The seal portion includes a plurality of compressed recesses and compressed projections along the first direction

Methodology Applied

Scientific EffectCompression: Compression

Data Source

PatentUS12564523B2Individually wrapped absorbent article and method for manufacturing individually wrapped absorbent article

Publication Date: 2026.03.03 DAIO PAPER CORP

AI summary

An individually wrapped absorbent article that includes an absorbent article, and a wrapping sheet configured to wrap the absorbent article is provided. The wrapping sheet is folded toward an inner surface of the wrapping sheet so as to cause a first region including one end in a first direction of the wrapping sheet and a second region including an opposite end in the first direction to overlap with each other, and a seal portion is formed at each edge portion in a second direction of the wrapping sheet. The second direction is perpendicular to the first direction. The seal portion includes a plurality of compressed recesses and compressed projections along the first direction. The compressed projections are formed between the compressed recesses.