SE8007120L - electret - Google Patents

electret

Info

Publication number
SE8007120L
SE8007120L SE8007120A SE8007120A SE8007120L SE 8007120 L SE8007120 L SE 8007120L SE 8007120 A SE8007120 A SE 8007120A SE 8007120 A SE8007120 A SE 8007120A SE 8007120 L SE8007120 L SE 8007120L
Authority
SE
Sweden
Prior art keywords
polarisation
electret
prior
temperature
electrets
Prior art date
Application number
SE8007120A
Other languages
Unknown language ( )
Swedish (sv)
Other versions
SE452525B (en
Inventor
Turnhout J Van
Original Assignee
Tno
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 Tno filed Critical Tno
Publication of SE8007120L publication Critical patent/SE8007120L/en
Publication of SE452525B publication Critical patent/SE452525B/en

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D39/00—Filtering material for liquid or gaseous fluids
    • B01D39/08—Filter cloth, i.e. woven, knitted or interlaced material
    • B01D39/083—Filter cloth, i.e. woven, knitted or interlaced material of organic material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D39/00—Filtering material for liquid or gaseous fluids
    • B01D39/10—Filter screens essentially made of metal
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D39/00—Filtering material for liquid or gaseous fluids
    • B01D39/14—Other self-supporting filtering material ; Other filtering material
    • B01D39/16—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres
    • B01D39/1607—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres the material being fibrous
    • B01D39/1623—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres the material being fibrous of synthetic origin
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
    • H01G7/00—Capacitors in which the capacitance is varied by non-mechanical means; Processes of their manufacture
    • H01G7/02—Electrets, i.e. having a permanently-polarised dielectric
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
    • H01G7/00—Capacitors in which the capacitance is varied by non-mechanical means; Processes of their manufacture
    • H01G7/02—Electrets, i.e. having a permanently-polarised dielectric
    • H01G7/021—Electrets, i.e. having a permanently-polarised dielectric having an organic dielectric
    • H01G7/023—Electrets, i.e. having a permanently-polarised dielectric having an organic dielectric of macromolecular compounds
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
    • B01D2239/04—Additives and treatments of the filtering material
    • B01D2239/0414—Surface modifiers, e.g. comprising ion exchange groups
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
    • B01D2239/04—Additives and treatments of the filtering material
    • B01D2239/0435—Electret
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
    • B01D2239/06—Filter cloth, e.g. knitted, woven non-woven; self-supported material
    • B01D2239/065—More than one layer present in the filtering material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
    • B01D2239/06—Filter cloth, e.g. knitted, woven non-woven; self-supported material
    • B01D2239/065—More than one layer present in the filtering material
    • B01D2239/0668—The layers being joined by heat or melt-bonding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
    • B01D2239/10—Filtering material manufacturing

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Textile Engineering (AREA)
  • Treatments Of Macromolecular Shaped Articles (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)

Abstract

A method for the manufacture of electrets from a material consisting of a polymer wherein a product formed from said material is heat treated to anneal it prior to its polarisation. In one example, a fluorinated polymer film is heated to its crystallisation temperature for at least one hour and is then quenched prior to its polarisation by corona discharge method. The electret shows improved stability as a function of temperature.
SE8007120A 1979-10-11 1980-10-10 PROCEDURE FOR MANUFACTURING THE ELECTRIC AND BIPOLES THE ELECTRIC POSITIVELY LOADED ON A PAGE BY THE PROCEDURE SE452525B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL7907539A NL7907539A (en) 1979-10-11 1979-10-11 METHOD FOR MANUFACTURING ELECTRETS

Publications (2)

Publication Number Publication Date
SE8007120L true SE8007120L (en) 1981-04-12
SE452525B SE452525B (en) 1987-11-30

Family

ID=19833999

Family Applications (1)

Application Number Title Priority Date Filing Date
SE8007120A SE452525B (en) 1979-10-11 1980-10-10 PROCEDURE FOR MANUFACTURING THE ELECTRIC AND BIPOLES THE ELECTRIC POSITIVELY LOADED ON A PAGE BY THE PROCEDURE

Country Status (6)

Country Link
JP (1) JPS56100409A (en)
DE (1) DE3038381A1 (en)
FR (1) FR2467474A1 (en)
GB (1) GB2060259B (en)
NL (1) NL7907539A (en)
SE (1) SE452525B (en)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4527218A (en) * 1981-06-08 1985-07-02 At&T Bell Laboratories Stable positively charged Teflon electrets
JPS60168511A (en) * 1984-02-10 1985-09-02 Japan Vilene Co Ltd Production of electret filter
US5019723A (en) * 1987-12-07 1991-05-28 Controlled Release Technologies, Inc. Self-regulated therapeutic agent delivery system and method
CA2037942A1 (en) * 1990-03-12 1991-09-13 Satoshi Matsuura Process for producing an electret, a film electret, and an electret filter
JPH05214A (en) * 1990-11-30 1993-01-08 Mitsui Petrochem Ind Ltd Electret filter
AU669420B2 (en) * 1993-03-26 1996-06-06 Minnesota Mining And Manufacturing Company Oily mist resistant electret filter media
JP3566477B2 (en) * 1996-12-26 2004-09-15 興研株式会社 Electrostatic filter
US6432175B1 (en) 1998-07-02 2002-08-13 3M Innovative Properties Company Fluorinated electret
JP4746291B2 (en) 2004-08-05 2011-08-10 オリンパス株式会社 Capacitive ultrasonic transducer and manufacturing method thereof
KR101144448B1 (en) * 2009-12-03 2012-06-14 현대자동차주식회사 Electrostatic non-woven intake filter manufacturing method and its products
DE102020002271B3 (en) * 2020-04-14 2021-06-17 Heinz Günther Römer Virological respirator to protect against droplet infections

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL6614505A (en) * 1965-10-23 1967-04-24
JPS5040720B1 (en) * 1970-09-26 1975-12-26
JPS5650408B2 (en) * 1973-07-05 1981-11-28

Also Published As

Publication number Publication date
NL7907539A (en) 1981-04-14
GB2060259B (en) 1983-12-14
DE3038381A1 (en) 1981-04-23
JPS56100409A (en) 1981-08-12
FR2467474B1 (en) 1984-11-30
SE452525B (en) 1987-11-30
FR2467474A1 (en) 1981-04-17
GB2060259A (en) 1981-04-29

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