[go: up one dir, main page]

GB2018436A - Porosity measurement - Google Patents

Porosity measurement

Info

Publication number
GB2018436A
GB2018436A GB7903708A GB7903708A GB2018436A GB 2018436 A GB2018436 A GB 2018436A GB 7903708 A GB7903708 A GB 7903708A GB 7903708 A GB7903708 A GB 7903708A GB 2018436 A GB2018436 A GB 2018436A
Authority
GB
United Kingdom
Prior art keywords
flow
porosity
sheet
parameter
pressure drop
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
GB7903708A
Other versions
GB2018436B (en
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Cigarette Components Ltd
Original Assignee
Cigarette Components Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Cigarette Components Ltd filed Critical Cigarette Components Ltd
Priority to GB7903708A priority Critical patent/GB2018436B/en
Publication of GB2018436A publication Critical patent/GB2018436A/en
Application granted granted Critical
Publication of GB2018436B publication Critical patent/GB2018436B/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
    • G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
    • G01N15/082—Investigating permeability by forcing a fluid through a sample
    • G01N15/0826—Investigating permeability by forcing a fluid through a sample and measuring fluid flow rate, i.e. permeation rate or pressure change

Landscapes

  • Chemical & Material Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Analytical Chemistry (AREA)
  • Dispersion Chemistry (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Fluid Mechanics (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Measuring Volume Flow (AREA)

Abstract

The porosity (gas permeability), of sheet material such as paper is usually expressed in terms of units of gas flow/unit sheet area/unit pressure drop across the sheet, and may be obtained from the measured gas flow F across the sheet at a fixed pressure drop PD or from the measured pressure drop at a fixed gas flow. One parameter is automatically set sequentially at a number (e.g. 3) of values near to a required value, the other parameter is measured at each, and from these readings the values of K and N for a relationship flow F = K(PD)<N> are ascertained for the sample under test in the region of the said required value of the one parameter. From this there is calculated the precise flow (or PD) at the exact required PD (or flow), and hence the porosity. The automatic setting of the flow rate at the close values, the calculation of K and N, and the calculation therefrom of the PD (or flow) at the given flow rate (or PD) and the porosity is achieved by means of a microprocessor. <IMAGE>
GB7903708A 1977-11-04 1979-02-02 Porosity measurement Expired GB2018436B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB7903708A GB2018436B (en) 1977-11-04 1979-02-02 Porosity measurement

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB4609977 1977-11-04
GB7903708A GB2018436B (en) 1977-11-04 1979-02-02 Porosity measurement

Publications (2)

Publication Number Publication Date
GB2018436A true GB2018436A (en) 1979-10-17
GB2018436B GB2018436B (en) 1982-07-07

Family

ID=26265731

Family Applications (1)

Application Number Title Priority Date Filing Date
GB7903708A Expired GB2018436B (en) 1977-11-04 1979-02-02 Porosity measurement

Country Status (1)

Country Link
GB (1) GB2018436B (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3209735A1 (en) * 1981-03-18 1982-11-04 British-American Tobacco Co. Ltd., London AUTOMATIC DETERMINATION DEVICE FOR THE GAS FLOWING / PRESSURE DROP CHARACTERISTICS OF A GAS PERMEABLE MATERIAL
WO1984004593A1 (en) * 1983-05-17 1984-11-22 Coulter Electronics Porosimeter and methods of assessing porosity
WO1987002771A1 (en) * 1985-10-24 1987-05-07 Gessner & Co. Gmbh Process and device for continuous measurement of porosity

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3209735A1 (en) * 1981-03-18 1982-11-04 British-American Tobacco Co. Ltd., London AUTOMATIC DETERMINATION DEVICE FOR THE GAS FLOWING / PRESSURE DROP CHARACTERISTICS OF A GAS PERMEABLE MATERIAL
WO1984004593A1 (en) * 1983-05-17 1984-11-22 Coulter Electronics Porosimeter and methods of assessing porosity
US4718270A (en) * 1983-05-17 1988-01-12 Coulter Electronics, Ltd. Porosimeter and methods of assessing porosity
WO1987002771A1 (en) * 1985-10-24 1987-05-07 Gessner & Co. Gmbh Process and device for continuous measurement of porosity

Also Published As

Publication number Publication date
GB2018436B (en) 1982-07-07

Similar Documents

Publication Publication Date Title
JPS5661612A (en) Apparatus for measuring fluid flow volume
GB779399A (en) Improvements in porosity measuring apparatus
JPS53100855A (en) Sensing apparatus for flow meter
FR2408133A1 (en) METHOD AND APPARATUS FOR MEASURING THE POROSITY OF A SHEET MATERIAL
JPS56104647A (en) Probe for percutaneous blood gas partial pressure measurement
ES8102355A1 (en) Method and apparatus for measuring porosity
DK236980A (en) MEASURING MEASURES FOR BLOOD GAS MEASUREMENT
GB2018436A (en) Porosity measurement
SE8400683D0 (en) PROCEDURE AND DEVICE FOR DETERMINING THE PROPERTIES OF FIBER MASS
SE8000463L (en) SET FOR DETERMINATION OF THE ALCOHOLIC CONTENT IN THE BREATHING AIR
DE3067318D1 (en) Device, composition and method for preparing a bilirubin control solution and method for determining the accuracy of a bilirubin test instrument
DE2310255A1 (en) METHOD AND DEVICE FOR DETERMINING THE GAS PERMEABILITY OF FILMS
JPS5533628A (en) Testing and inspecting device of flow meter
ES467459A1 (en) Method of and apparatus for measuring physical or chemical properties of flowable materials
SU672553A1 (en) Device for determining moisture-content by weight measurements
GB1145542A (en) Improved method and apparatus for determining the permeability of a material
IT9020658A1 (en) APPARATUS TO TRY THE STEAM TRANSMISSION THROUGH TEXTILE MATERIALS.
JPS5522101A (en) Flow meter
GB1578630A (en) Automatic diffusion porometer
JPS56129840A (en) Inspection apparatus for property of smoke
CN85106179A (en) Measure the steam breathability of material
SU1280493A1 (en) Installation for measuring moisture content,particularly,when calibrating infrared moisture meters
JPS6244906B2 (en)
SU373618A1 (en) METHOD FOR DETERMINING THE POROSITY OF SOLID BULK MATERIALS
JPS5463795A (en) Measured gas guide tube for dew point detection type humidity measuring instrument

Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee