Hotmelt-Coated Fibrous Layer for Low-Dusting High-Speed Converting

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Solution Overview

Problem

Fibrous layers used in absorbent articles experience fiber breakage and dusting during high-speed manufacturing, leading to contamination and process issues, with existing solutions like latex coatings introducing odor and process difficulties.

Innovation Solution

A hotmelt composition, primarily comprising metallocene-catalyzed polymers, is applied to coat and bind fibers on the surface of the fibrous layer, reducing dusting and enhancing fluid handling properties.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If latex coating is applied to reduce dusting, then fiber binding effectiveness is improved, but odor issues and process difficulties are introduced

Engineering Contradiction:

Improvefiber binding effectivenessVSAvoidodor issues

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent changes the chemical composition parameters of the coating material from latex to hotmelt composition comprising metallocene-catalyzed polymer. This parameter change maintains the fiber binding effectiveness while eliminating the odor issues associated with latex coatings.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The hotmelt composition is applied as a disposable coating that performs its binding function and then can be discarded or processed along with the fibrous layer, avoiding the need for durable latex coatings that cause ongoing odor problems.

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

2Reliability

If latex coating is applied to reduce dusting, then fiber binding effectiveness is improved, but process complexity increases due to drying steps

Engineering Contradiction:

Improvefiber binding effectivenessVSAvoidprocess complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent extracts the drying step from the coating process by using a hotmelt composition that cures through cooling rather than evaporation. This eliminates the need for separate drying equipment and process steps, reducing overall process complexity.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent replaces the thermal drying mechanism with a thermal cooling mechanism. Instead of using heat to evaporate solvent, the hotmelt composition simply cools and solidifies, substituting a complex drying system with a simpler cooling process.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Reliability

If latex coating is applied to reduce dusting, then fiber binding effectiveness is improved, but build up at idlers occurs during converting

Engineering Contradiction:

Improvefiber binding effectivenessVSAvoidbuild up at idlers

Core Design Contradiction:

ReliabilityVSObject-generated harmful factors

Solution Approach 1:

The patent changes the physical and chemical parameters of the coating material to create a non-sticky hotmelt composition that does not build up on surfaces. The metallocene-catalyzed polymer provides adequate binding strength without the adhesive properties that cause build-up at idlers during converting operations.

Inventive Principle:

Principle #35Parameter changes

4Productivity

If high speed manufacturing is used to increase productivity, then output is improved, but fiber breakage and dusting increase

Engineering Contradiction:

Improvemanufacturing speedVSAvoidfiber integrity

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent applies the hotmelt coating before the fibrous layer undergoes high-speed handling and processing. This preliminary action of coating and binding fibers in advance prevents breakage and dusting during subsequent high-speed manufacturing operations.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The hotmelt coating acts as a protective cushion that holds fibers together before they are subjected to the stresses of high-speed manufacturing. This prior protection prevents fiber breakage and dusting that would otherwise occur during rapid processing.

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

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 hotmelt composition effectively immobilizes fibers, reducing dusting and maintaining fluid handling capabilities while avoiding the drawbacks of latex coatings.

Implementation Method 1

a hotmelt composition applied on at least one of its external sides... The hotmelt coating composition reduces dusting by coating and binding the fibers at the surface of the fibrous layer

Methodology Applied

Scientific EffectHotmelt coating: Deposition (physical)

Data Source

PatentEP4326203B1Fibrous layer with hotmelt coating composition

Publication Date: 2025.11.19 PROCTER & GAMBLE CO

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AI summary

A fibrous layer (28) having a first side and an opposed second side, wherein the fibrous layer comprises a hotmelt composition (32) that at least partially coats and binds the fibers (12, 16) of the fibrous layer at the surface of at least one of the first side and second side.