Roll-Type Hook Tape for Disposable Diapers with Narrow Hooks

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Solution Overview

Problem

Conventional roll-type hook tapes for disposable diapers have limitations in fastening force due to concentrated edge application, increased manufacturing costs from sparse hook arrangements, and issues with hot melt adhesive exposure leading to commercialization challenges.

Innovation Solution

A roll-type hook tape with a band-shaped hook base nonwoven fabric, featuring a handle portion, waves, and identification color, with narrow hooks spaced 0.5 mm to 1.9 mm apart, and a wing film for enhanced fastening and reduced adhesive exposure, allowing for efficient cutting and use as a hook member.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Force

If a plurality of narrow hooks are arranged sparsely to extend the edge portion, then the fastening force gets higher, but manufacturing costs are increased due to the use of a great deal of hook materials

Engineering Contradiction:

Improvefastening forceVSAvoidhook materials

Core Design Contradiction:

ForceVSQuantity of substance

Solution Approach 1:

The hook is divided into multiple narrow hooks arranged in stages. Instead of using a single wide hook, the invention segments the hook into several narrow hooks (first, second, and third narrow hooks) positioned at different locations. This segmentation allows the fastening force to be distributed across multiple contact points with the loop, increasing overall fastening force while using less total hook material compared to a single large hook.

Inventive Principle:

Principle #1Segmentation

2Force

If a plurality of narrow hooks are arranged sparsely, then the fastening force gets higher, but there are an unnatural action that the hooks are caught in multiple stages and a discontinuous motion caused when the hooks are removed from the loop

Engineering Contradiction:

Improvefastening forceVSAvoidhook detachment smoothness

Core Design Contradiction:

ForceVSEase of operation

Solution Approach 1:

The invention introduces curved guide surfaces (first, second, and third curved surfaces) that guide the loop as it engages with and disengages from the narrow hooks. These curved surfaces ensure that the loop contacts all narrow hooks simultaneously during attachment and detachment, eliminating the unnatural multi-stage catching action and achieving smooth, continuous motion. The curvature of these surfaces is specifically designed to match the hook arrangement geometry.

Inventive Principle:

Principle #14Spheroidality (Curvature)

3Strength

If hot melt adhesive is applied to the front surface of the base nonwoven fabric, then the hooks are firmly fixed, but the front and rear surfaces of the roll are attached to each other when the roll-type hook tape is rolled for commercialization

Engineering Contradiction:

Improvehook fixation strengthVSAvoidroll commercialization

Core Design Contradiction:

StrengthVSEase of manufacture

Solution Approach 1:

The invention extracts the adhesive application area from the entire front surface and limits it to specific regions only. The hot melt adhesive is applied exclusively to the rear surfaces of the narrow hooks and to specific areas of the base nonwoven fabric that do not interfere with rolling. By removing adhesive from areas that would cause roll surface attachment, the invention enables successful roll commercialization while maintaining strong hook fixation through targeted adhesive application.

Inventive Principle:

Principle #2Taking out (Extraction)

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 enhances fastening force with multiple edge actions, minimizes unnatural hook detachment, and prevents adhesive exposure issues, thereby improving manufacturing efficiency and commercialization of roll-type hook tapes.

Implementation Method 1

the diaper fastening portions are firmly fixed to the diaper band portions, in an overlapped state with the diaper band portions, through a fastening method, such as thermal compression, ultrasonic fastening, or a fastening method using hot melt

Methodology Applied

Scientific EffectThermal compression:

Implementation Method 2

Methodology Applied

Scientific EffectUltrasonic fastening: Ultrasonic Vibration

Data Source

PatentUS12150847B2Roll-type hook tape for providing disposable diaper hook member

Publication Date: 2024.11.26 LARK INDS

AI summary

The present invention relates to a roll-type hook tape for providing a disposable diaper hook member, which is more stably fastened to a loop member which is a counterpart of the hook member, and greatly contributes to manufacturing and commercialization in the form of a roll.