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Philip Morris

Porosity of Cigarette Paper

Date: May 1976
Length: 5 pages
2050799184-2050799188
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Fields

Author
Wiley, R.M.
Type
MANU, MANUAL, HANDBOOK, CATALOGUE
BIBL, BIBLIOGRAPHY
DRAW, DRAWING
LPRO, LAB PROTOCOL
Site
R100
Characteristic
EXTR, EXTRA
Area
CENTRAL FILES/DATABASE CORRESPONDENCE
Master ID
2050799046/9391

Related Documents:
Litigation
Stmn/Produced
Request
Stmn/R1-082
Named Organization
Ecusta
Greiner Scientific
Date Loaded
23 May 1999
UCSF Legacy ID
euu81f00

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Page 1: euu81f00
Method Number P-1 POROSITY OF CIGARETTE PAPER I. INTRODUCTION AND SUMMARY The porosity of paper and paper-like materials can be determined using a modified Greiner Water Porosity Device. Porosity of the material is determined by the length of time necessary to draw 50 ml of air through a.786 in2 area. The air flow is induced by a falling water column, and the time for 50 mIl of air to pass through the sample area is measured by the time required for the water level to pass between two electrodes, the equivalent of 50 ml. The porosity of any paper or paper-like material having porous surfaces can be measured in this device. The temperature and humidity of the air must be controlled to insure reproducible values. For standard paper samples the relative standard deviation at the 2-sigma level is ±22%. Similar deviations are obtained for typical commercial samples. II. SAMPLE REQUIREMENTS Total sample recommended: 10 cigarettes Sample recommended per determination: 1 cigarette Replicate determinations normally made: 10 ~ Man-hours per determination: 2 minutes d C5~ ~ ~ Man-hours for replicates: 15 minutes/10 determinations Ct~ ~ Total elapsed time: 15 minutes/10 determinations ~ ~ ~ R 5/76
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Page 2 Method Number P-1 III. APPARATUS 1. Modified Greiner Water Porosity Device, Greiner Scientific Corporation, New York, N.Y., (See Figure 1) 2. Standard paper samples of various known porosities, Ecusta Paper Operations, Pisgah Forest, North Carolinz IV. PROCEDURE The sample is inserted between the jaws of the mechanical head of the apparatus. The leveling bulb is lowered causing 50 ml of the water to drop from one sensing electrode to the other. The timer automatically registers the time required for the passage of the 50 ml of water which is equivalent to 50 ml of air passage through the sample. 1. Turn switch ur,10 to ON position. indicator light #9A will come on. 2. Press foot pedal #11 to open the jaws of the mechanici head. open.) (Foot pedal must remain depressed to keep jaws 3. Insert the sample between the jaws and adjust to guidt lines. if the cigarette packs have been stored at proper conditions of temperature and relative humidity (75°F and 60%) the sample paper may be teste( as soon as it is cut from the cigarette without further conditioning. 4. Release the foot pedal to close the jaws. R 5/76
Page 3: euu81f00
Page 3 Method Number P-1 5. Lower the leveling bulb from position stand #5A to position stand #5B. This will activate safety switch #6 and will start the water flow. The timer will automatically register the time required for the water to pass from one electrode.to the other. 6. When indicator light #9B comes on, the analysis is completed. 7. Record the time indicated on the timer. 8. Reset the leveling bulb to position stand n5A. 9. Repeat steps 2 through 8 for each measurement. V. CALCULATION Porosity = Seconds/50 ml air passage through the sample (Read directly from the timer) VI. CALIBRATION Calibrate the porosity device each day using standard paper samples of porosity ranges approximating those of the samples to be analyzed (10, 20, 30, 45). Proceed as described in Section IV steps 1-8. If the porosity value obtained for the standard paper deviates from its correct value, add or remove water from the leveling bulb as required to yield the correct porosity for the t"Z O standard. ~ C Replace the standard paper samples with fresh standards OQ ~ as needed. ~ ~ ~ R 5/76
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VII. REFERENCE Ferri, John A., Notebook No. 1598, pp. 1-3, June 11, 1963. R 5/76
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Figure 1 Method Number P-1 1. Mechanical head 2. Paper insertion pozt 3. Sensing electrodes 4. Leveling bulb 5. Bulb positioning stan 6. Safety switch 7. 110 v. AC line , 8. Main fuse 9. Indicating lights 10. Main switch 11 Foot pedal , ~ 12. T imer ~; 134. Fuse ~ ~ ~ ~. to ~ ~ . ~e ~ ~.

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