Lyocell Smoking Article Filters With TEC-PEG Migration Control

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Solution Overview

Problem

The hydrophobicity of phenol reducing materials in lyocell tow causes issues such as bursting of the filter portion wrapper and spreading of ink on the tipping paper, degrading the quality of smoking article filters.

Innovation Solution

Optimizing the composition ratio of triethyl citrate (TEC) and polyethylene glycol (PEG) in the phenol functional additive dispersed in lyocell tow, along with using wrapping paper with a predetermined basis weight, to minimize the transfer of the additive to the wrapper and prevent bursting and ink spread.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If phenol reducing material is added to lyocell tow, then phenol reduction performance is improved, but filter wrapper bursting occurs due to adhesive deterioration

Engineering Contradiction:

Improvephenol reduction performanceVSAvoidfilter wrapper strength

Core Design Contradiction:

ReliabilityVSStrength

Solution Approach 1:

The patent optimizes the molecular weight parameter of PEG (specifically PEG 600) and its composition ratio with TEC to control the hydrophobicity of the phenol reducing material. This parameter adjustment reduces the material's tendency to migrate to the wrapper, preventing adhesive deterioration and wrapper bursting while maintaining phenol reduction effectiveness.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent uses a composite phenol reducing material system comprising both PEG and TEC in specific ratios. This composite approach balances the phenol reduction capability with reduced hydrophobicity and migration tendency, resolving the contradiction between effectiveness and wrapper integrity.

Inventive Principle:

Principle #40Composite materials

2Reliability

If phenol reducing material is added to lyocell tow, then phenol reduction performance is improved, but ink spread on tipping paper occurs

Engineering Contradiction:

Improvephenol reduction performanceVSAvoidtipping paper print quality

Core Design Contradiction:

ReliabilityVSManufacturing precision

Solution Approach 1:

By optimizing the molecular weight of PEG to 600 and adjusting its composition ratio with TEC, the patent reduces the hydrophobicity of the phenol reducing material. This parameter control prevents the material from migrating to the tipping paper surface, thereby preventing ink spread and maintaining print quality while preserving phenol reduction performance.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The optimized PEG-TEC composite acts as an intermediary that provides phenol reduction functionality without the excessive hydrophobicity that causes ink spread. The specific composition ratio serves as a mediator between the functional requirement and the quality requirement.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Reliability

If grease-resistant hard wrapping paper is used, then phenol reducing material transfer is reduced, but manufacturing complexity and cost increase

Engineering Contradiction:

Improvematerial transfer controlVSAvoidwrapping paper treatment complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent converts the naturally hydrophilic property of standard wrapping paper into a benefit by optimizing the phenol reducing material composition. The optimized PEG-TEC mixture has controlled hydrophobicity that prevents migration to the wrapper, eliminating the need for grease-resistant treatment while maintaining transfer control.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

Solution Approach 2:

By changing the composition parameters of the phenol reducing material (PEG molecular weight and PEG:TEC ratio), the patent reduces material hydrophobicity and migration tendency, allowing the use of simple, non-treated wrapping paper and avoiding the complexity and cost of grease-resistant treatments.

Inventive Principle:

Principle #35Parameter changes

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 optimized composition ratio effectively reduces phenols in cigarette smoke while maintaining filter quality and biodegradability, preventing wrapper bursting and ink spread, even with non-grease-resistant wrapping paper.

Implementation Method 1

a phenol reducing material (hereinafter interchangeably used with 'phenol functional additive') that can specifically reduce phenols generated during smoking is added to reduce phenols in mainstream smoke

Methodology Applied

Scientific EffectAdsorption: Adsorption

Implementation Method 2

due to hydrophobicity of a phenol reducing material, the phenol reducing material may be transferred from inside tow to a filter portion wrapper

Methodology Applied

Scientific EffectHydrophobicity-driven transfer: Hydrophobe

Data Source

PatentEP4599705A1Filter for smoking article and smoking article having thereof

Publication Date: 2025.08.13 KT&G CO LTD

Figure 1
Figure 2(a)~2(d)

AI summary

A smoking article filter and a smoking article including the same are provided. The smoking article filter includes a filter portion including lyocell tow including lyocell fibers and a phenol functional additive dispersed in the lyocell tow and a filter portion wrapper surrounding the filter portion, wherein the phenol functional additive includes triethyl citrate (TEC) and polyethylene glycol (PEG), and a ratio of the TEC and the PEG ranges from 9:1 to 1:9.