GB2060259B - Method for the manufacture of electrets - Google Patents

Method for the manufacture of electrets

Info

Publication number
GB2060259B
GB2060259B GB8032815A GB8032815A GB2060259B GB 2060259 B GB2060259 B GB 2060259B GB 8032815 A GB8032815 A GB 8032815A GB 8032815 A GB8032815 A GB 8032815A GB 2060259 B GB2060259 B GB 2060259B
Authority
GB
United Kingdom
Prior art keywords
electrets
manufacture
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.)
Expired
Application number
GB8032815A
Other versions
GB2060259A (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.)
NEDERLANDSE APPL SCIENT RES
Original Assignee
NEDERLANDSE APPL SCIENT RES
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 NEDERLANDSE APPL SCIENT RES filed Critical NEDERLANDSE APPL SCIENT RES
Publication of GB2060259A publication Critical patent/GB2060259A/en
Application granted granted Critical
Publication of GB2060259B publication Critical patent/GB2060259B/en
Expired legal-status Critical Current

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 OR LIGHT-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 OR LIGHT-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)
  • Textile Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Treatments Of Macromolecular Shaped Articles (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
GB8032815A 1979-10-11 1980-10-10 Method for the manufacture of electrets Expired GB2060259B (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
GB2060259A GB2060259A (en) 1981-04-29
GB2060259B true GB2060259B (en) 1983-12-14

Family

ID=19833999

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8032815A Expired GB2060259B (en) 1979-10-11 1980-10-10 Method for the manufacture of electrets

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
FR2467474A1 (en) 1981-04-17
SE8007120L (en) 1981-04-12
SE452525B (en) 1987-11-30
NL7907539A (en) 1981-04-14
FR2467474B1 (en) 1984-11-30
GB2060259A (en) 1981-04-29
JPS56100409A (en) 1981-08-12
DE3038381A1 (en) 1981-04-23

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Legal Events

Date Code Title Description
732 Registration of transactions, instruments or events in the register (sect. 32/1977)
PCNP Patent ceased through non-payment of renewal fee