Perforated Paper Tube Cooling Structure for Stable Menthol Transfer

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Solution Overview

Problem

Existing cigarette designs face limitations in maximizing menthol transfer, nicotine transfer, and atomization due to thermal deformation of cellulose acetate filters, leading to reduced flavor and cooling efficiency.

Innovation Solution

A smoking article with a paper-based cooling structure featuring a tube shape and circumferential perforations that maintains airtightness and rigidity, enhancing menthol and nicotine transfer while minimizing flavor loss.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Quantity of substance

If a flavoring liquid is added to the filter to increase flavor during smoking, then the amount of menthol transfer is improved, but the flavoring liquid transfers to adjacent unflavored structures over time, causing rapid decrease in menthol amount

Engineering Contradiction:

Improvementhol transfer amountVSAvoidmenthol transfer stability

Core Design Contradiction:

Quantity of substanceVSReliability

Solution Approach 1:

The filter is divided into distinct functional segments: a flavoring section with applied menthol and a cooling section with paper material and perforations. This segmentation prevents flavoring liquid migration to unflavored structures while maintaining stable menthol transfer in the smoking mainstream.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The cooling structure with paper material and perforations acts as an intermediary between the flavoring liquid and the mouthpiece. It controls the release and transfer of menthol while preventing unwanted migration, thereby stabilizing the menthol transfer amount throughout the smoking process.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Quantity of substance

If the cooling structure is designed to maximize menthol transfer, then the flavor and cooling effect are improved, but thermal deformation of the cellulose acetate filter occurs, reducing atomization and nicotine transfer

Engineering Contradiction:

Improvementhol transfer amountVSAvoidthermal deformation

Core Design Contradiction:

Quantity of substanceVSObject-affected harmful factors

Solution Approach 1:

The cooling structure uses paper material with specific physical parameters (perforation size, distribution, and pattern) that allow efficient menthol transfer while maintaining structural integrity under thermal conditions. This parameter optimization prevents thermal deformation of the cellulose acetate filter.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The filter combines cellulose acetate material with a paper-based cooling structure featuring perforations. This composite design leverages the complementary properties of both materials: cellulose acetate for filter functionality and paper with perforations for controlled menthol transfer and thermal stability.

Inventive Principle:

Principle #40Composite materials

3Ease of manufacture

If a paper tube cooling structure is used, then manufacturing simplicity and cost are improved, but maintaining airtightness and rigidity becomes difficult

Engineering Contradiction:

Improvemanufacturing simplicityVSAvoidairtightness and rigidity

Core Design Contradiction:

Ease of manufactureVSStrength

Solution Approach 1:

The paper cooling structure uses controlled porosity through perforations rather than being completely solid or completely porous. This allows the structure to maintain rigidity and airtightness where needed while enabling menthol transfer through the perforated sections, achieving both manufacturing simplicity and structural integrity.

Inventive Principle:

Principle #31Porous materials

Solution Approach 2:

The paper tube cooling structure has non-uniform properties: solid wall sections provide airtightness and rigidity, while perforated sections enable menthol transfer. This local quality variation allows the structure to satisfy multiple conflicting requirements simultaneously.

Inventive Principle:

Principle #3Local quality

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 cooling structure ensures uniform flavor distribution, reduces heat deformation, and increases atomization, providing enhanced smoking satisfaction by maintaining menthol and nicotine levels.

Implementation Method 1

a cooling structure made of a paper material, having a tube shape, and located downstream of the smoking material portion

Methodology Applied

Scientific EffectHeat transfer: Conduction (thermal)

Implementation Method 2

a plurality of perforations arranged in a circumferential direction of the body portion such that the inside and outside of the body portion are in fluid communication with each other

Methodology Applied

Scientific EffectFluid flow: Convection

Data Source

PatentUS12396479B2Cooling structure and a smoking article including the same

Publication Date: 2025.08.26 KT&G CO LTD

AI summary

A cooling structure, which is located downstream of a smoking material portion provided in a smoking article and located upstream of a mouthpiece portion, includes: a body portion that has a tube shape having a hollow therein and is made of a paper material; and a plurality of perforations that are arranged in a circumferential direction of the body portion such that the inside and outside of the body portion are in fluid communication with each other.