CO Diffusion Through Cigarette Paper - coresta.org · CO diffusion through cigarette paper is...

© 2013 Schweitzer-Mauduit International, Inc. Confidential 1

CO Diffusion Through Cigarette Paper

Dr. Joseph Wanna

SWM Intl.

100 North Point Center East, Suite 600

Alpharetta, GA

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1

2

3

4

Introduction

Experimental setup

Test Results

Summary

Agenda

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Introduction

Cigarette paper plays a critical role in CO diffusion during the

smoking process.

CO diffusion through cigarette paper is critical in controlling CO in

mainstream smoke.

Introducing bands with low diffusion to meet LIP regulations

increase CO level in mainstream smoke.

Understanding CO diffusion around the LIP paper in situ around

and in the band may provide further mechanistic understanding on

CO diffusion during smoking.

There are no available tests to measure CO diffusion at specific

locations in cigarette paper during the smoking process.

This presentation will report on preliminary measurements of CO

diffusion through the band and base paper during the smoking

process.

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Experimental Setup

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Experimental Setup

Upon SWM request Arista Lab developed a technique

to measure CO diffusion at specific locations along the

cigarette tobacco column.

A ring that goes around the tobacco column is attached

to a tube connected to a CO analyzer.

The CO analyzer produces a signal corresponding to

CO level diffusing through the paper.

Signal in volts was changed to mg/puff after calibration

to known flows.

ISO smoking regime was used.

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Setup used to measure CO

Tube connected to CO analyser

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CO measurements during smoking

The ring is moved down the tobacco column

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Generated CO signals as a function of puff number

During the puff the signal increases to a peak then tails off

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Cigarette brand properties

Property Tobacco

Column

density

(mg/cc)

Band

Type

Base

Porosity

(CU)

Base D*

(cm/sec)

Band

Porosity

(CU)

Band D*

(cm/sec)

Band

(mm)

Brand #1 253 A 70.5 1.30 21 0.039 6

Brand #2 235 C 34 1.20 10.5 0.100 6

Brand #3 238 C 55 1.32 14.5 0.080 6

Brand #4 226 B 45 1.05 21 0.034 7

Brand #5 250 B 20 1.27 12 0.094 6

Brand #6 240 B 19 1.10 14 0.053 7

• Six commercial cigarettes brands were purchased from local stores • Physical properties were tested and listed in the table below. • Band D* ranged from 0.034 to 0.100 cm/sec

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Results

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CO diffusion through bands and base paper

Property CO diffusion through 1st

band

CO diffusion through paper between bands

CO diffusion through 2nd

band

CO diffusion through paper after 2nd band

Brand #1 0.123 0.139 0.098 0.124

Brand #2 0.141 0.160 0.107 0.152

Brand #3 0.135 0.203 0.121 0.147

Brand #4 0.092 0.157 0.119 0.127

Brand #5 0.107 0.171 0.119 0.120

Brand #6 0.109 0.201 0.129 0.108

Average CO (mg/puff) diffusion

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CO diffusion through bands and paper segments

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CO diffusion through bands and base paper

Property CO diffusion through bands

Band D* (cm/sec)

CO diffusion through paper

Base paper D* (cm/sec)

Brand #1 0.221 0.039 0.263 1.30

Brand #2 0.248 0.100 0.312 1.20

Brand #3 0.256 0.080 0.350 1.32

Brand #4 0.211 0.034 0.284 1.05

Brand #5 0.226 0.094 0.291 1.27

Brand #6 0.238 0.053 0.309 1.10

Average CO (mg/puff) diffusion

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CO diffusion through bands vs. Band D*

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CO diffusion base paper vs. base paper D*

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Summary

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Summary

A new technique was developed to measure in situ CO

diffusion through cigarette paper at specific locations

during puffing.

Overall CO diffusion through the paper is 30% higher

than diffusion through the bands.

CO diffusion through paper between the bands is ~50%

higher than through the bands.

Trend shows higher CO diffusion through bands with

higher diffusion capacity.

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Acknowledgments

Arista lab for developing the method

Chuan Liu from BAT GR&D Southampton for stimulating

discussions

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CO Diffusion Through Cigarette Paper - coresta.org · CO diffusion through cigarette paper is...

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Transcript of CO Diffusion Through Cigarette Paper - coresta.org · CO diffusion through cigarette paper is...