Smoking Article Filter With Fluted Mixing Chamber

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Solution Overview

Problem

Existing ventilated cigarettes fail to effectively combine mainstream smoke with ventilation air while maintaining desired resistance to draw and filtration efficiency.

Innovation Solution

A smoking article design featuring a filter with a first segment of fibrous cellulose acetate or cellulose acetate tow with activated carbon, a second segment with a hollow frusto-conical upstream portion and fluted downstream portion, and a mouthpiece filter segment with ventilation holes, which mixes mainstream smoke with ventilation air by directing it through orifices and flutes, enhancing particle filtration and airflow.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If ventilation holes are added to increase ventilation, then mixing of mainstream smoke with ventilation air is improved, but resistance to draw increases

Engineering Contradiction:

ImproveventilationVSAvoidresistance to draw

Core Design Contradiction:

Adaptability or versatilityVSStress or pressure

Solution Approach 1:

The filter is divided into multiple segments with distinct functions: a first filter segment for initial filtration, a second filter segment with hollow frusto-conical upstream portion and fluted downstream portion for smoke mixing, and a mouthpiece filter segment with ventilation holes. This segmentation allows each segment to optimize its specific function while working together to balance ventilation and draw resistance.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent introduces a three-dimensional fluted structure in the downstream portion of the second filter segment, creating tortuous pathways that increase the effective surface area for smoke mixing without proportionally increasing linear dimensions. This dimensional approach allows enhanced ventilation mixing while controlling resistance to draw.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

2Adaptability or versatility

If filter segments are added to improve smoke mixing, then ventilation effectiveness is improved, but device complexity increases

Engineering Contradiction:

Improvesmoke mixingVSAvoidfilter structure

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

Multiple filter segments are combined into a single integrated filter assembly that is inserted as one unit into the cigarette. The segments are joined together to form a continuous structure with internal channels and flutes, merging filtration and mixing functions into a unified component rather than separate parts.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The second filter segment with its hollow frusto-conical upstream portion and fluted downstream portion serves multiple functions: it acts as a mixing chamber for smoke and ventilation air, provides structural support for the ventilation holes, and maintains the desired resistance to draw. This multi-functionality reduces the need for additional separate components.

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Manufacturing precision

If orifices are added to direct smoke through flutes, then particle filtration is improved, but manufacturing complexity increases

Engineering Contradiction:

Improveparticle filtrationVSAvoidfilter manufacturing

Core Design Contradiction:

Manufacturing precisionVSEase of manufacture

Solution Approach 1:

The patent replaces complex mechanical assembly operations with a single injection molding process that forms the entire multi-segment filter structure in one step. The injection molded structure integrates the hollow frusto-conical portion, fluted downstream portion, and ventilation holes without requiring separate machining or assembly operations for these features.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

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 design achieves elevated ventilation with acceptable resistance to draw and desirable smoke quality, allowing for mass production with improved organoleptic qualities.

Implementation Method 1

mixes mainstream smoke with ventilation air by directing it through orifices and flutes

Methodology Applied

Scientific EffectFluid mixing:

Implementation Method 2

first filter segment which is constructed of a fibrous cellulose acetate (CA) tow or a plug of cellulose acetate tow laden with activated carbon particles

Methodology Applied

Scientific EffectAdsorption: Adsorption

Implementation Method 3

enhancing particle filtration and airflow

Methodology Applied

Scientific EffectPhysical filtration: Filter (physical)

Data Source

PatentEP2048978B1Smoking article with single piece restrictor and chamber

Publication Date: 2014.12.03 PHILIP MORRIS PRODUCTS SA

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AI summary

A smoking article 10 having a filter segment 22 that establishes both a desired resistance to draw and a mixing of mainstream smoke with ventilation air is disclosed. The filter segment includes a fluted portion 26, a frusto-conical portion 24 and axially extending orifices 34 establishing fluid communication between the frusto-conical portion and voids 28 between one or more walls of the fluted portion.