Disposable Wearing Article Waist Alignment via Fastener Bridging

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Solution Overview

Problem

The existing process for manufacturing disposable wearing articles with detachable waist regions can result in irregularly shaped products due to tensile forces affecting the alignment and shape of the waist regions during production, especially when elastic members are attached, leading to potential distortion and irregular shapes in the continuously produced individual articles.

Innovation Solution

A process involving the sequential steps of folding, cutting, and bonding of composite webs with specific fastener arrangements and elastic member attachments ensures that the waist regions remain aligned and regularly shaped, even under tensile forces, by using a composite web structure with rectilinear slits and notches, and attaching fastener base sheets to maintain alignment and prevent distortion.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If the web is partially cut off to form gaps during continuous production, then individual wearing articles can be separated, but the waist regions may become misaligned and irregularly shaped due to tensile forces

Engineering Contradiction:

Improvecontinuous production capabilityVSAvoidwaist region alignment and shape regularity

Core Design Contradiction:

ProductivityVSManufacturing precision

Solution Approach 1:

The web is divided into multiple individual wearing articles by cutting along boundary lines, creating gaps between adjacent articles. This segmentation enables continuous production while the patent addresses the alignment issue by strategically positioning fastener means to bridge these gaps and maintain waist region regularity

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Fastener means are attached to the web before the cutting process. This preliminary attachment ensures that when the web is cut into individual articles, the fastener means remain intact and can properly align the waist regions, preventing misalignment and irregular shapes that would otherwise occur due to tensile forces during production

Inventive Principle:

Principle #10Preliminary action

2Adaptability or versatility

If elastic members are attached to the web before cutting, then the wearing articles gain elastic functionality, but the tensile forces cause the waist regions to jolt out of alignment and twist

Engineering Contradiction:

Improveelastic functionalityVSAvoidwaist region alignment

Core Design Contradiction:

Adaptability or versatilityVSManufacturing precision

Solution Approach 1:

The fastener means serve as an intermediary element between the elastic members and the waist regions. By attaching fastener means to the web before cutting, the patent creates a stable connection point that prevents the elastic members from causing misalignment and twisting of the waist regions during production

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The fastener means are positioned to counteract the tensile forces generated by elastic members before the web is cut. This preliminary anti-action prevents the waist regions from jolting out of alignment or twisting, maintaining manufacturing precision while preserving elastic functionality

Inventive Principle:

Principle #9Preliminary anti-action

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 process effectively prevents distortion and ensures that the continuously produced individual wearing articles have regularly shaped waist regions, maintaining alignment and preventing irregular shapes, even when subjected to tensile forces during production.

Implementation Method 1

the continuous chassis 532 is kept in close contact with the endless belt under a vacuum suction effect

Methodology Applied

Scientific EffectVacuum suction: Vacuum

Implementation Method 2

the possibility that the respective front waist regions 522 might be irregularly shaped will become more actual due to contraction of the elastic members 554 affect the chassis 532

Methodology Applied

Scientific EffectElastic contraction: Elasticity

Data Source

PatentUS7708857B2Process for making disposable wearing article

Publication Date: 2010.05.04 UNI CHARM CORP

AI summary

In a process for making disposable wearing article, a composite web running in a machine direction is formed with a pair of rectilinear slits extending in a cross direction and a notch intersecting these paired slits. A region surrounded by these slits and notch is cut away from the composite web to form a gap. In a step before the composite web is formed with the gap, second fastener means supported on a fastener base sheet strip are engaged with the associated pair of first fastener means previously bonded to the composite web opposed to each other about the gap as viewed in the machine direction and thereby the fastener base sheet strip is attached to the composite web so as to stride over the gap.