US3878031A - Packing for movable machine parts - Google Patents

Packing for movable machine parts Download PDF

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Publication number
US3878031A
US3878031A US406132A US40613273A US3878031A US 3878031 A US3878031 A US 3878031A US 406132 A US406132 A US 406132A US 40613273 A US40613273 A US 40613273A US 3878031 A US3878031 A US 3878031A
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US
United States
Prior art keywords
weight
core
packing
polytetrafluoroethylene
graphite
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 - Lifetime
Application number
US406132A
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English (en)
Inventor
Frederic J Dormer
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to US406132A priority Critical patent/US3878031A/en
Priority to AT742074A priority patent/AT334701B/de
Priority to GB4093774A priority patent/GB1474976A/en
Priority to DE2444847A priority patent/DE2444847C2/de
Priority to CH1276974A priority patent/CH618249A5/de
Priority to IT28168/74A priority patent/IT1022693B/it
Application granted granted Critical
Publication of US3878031A publication Critical patent/US3878031A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F16J15/16—Sealings between relatively-moving surfaces
    • F16J15/18—Sealings between relatively-moving surfaces with stuffing-boxes for elastic or plastic packings
    • F16J15/20—Packing materials therefor
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/29—Coated or structually defined flake, particle, cell, strand, strand portion, rod, filament, macroscopic fiber or mass thereof
    • Y10T428/2913—Rod, strand, filament or fiber
    • Y10T428/2915—Rod, strand, filament or fiber including textile, cloth or fabric
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/29—Coated or structually defined flake, particle, cell, strand, strand portion, rod, filament, macroscopic fiber or mass thereof
    • Y10T428/2913—Rod, strand, filament or fiber
    • Y10T428/2929—Bicomponent, conjugate, composite or collateral fibers or filaments [i.e., coextruded sheath-core or side-by-side type]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/29—Coated or structually defined flake, particle, cell, strand, strand portion, rod, filament, macroscopic fiber or mass thereof
    • Y10T428/2913—Rod, strand, filament or fiber
    • Y10T428/2933—Coated or with bond, impregnation or core
    • Y10T428/294—Coated or with bond, impregnation or core including metal or compound thereof [excluding glass, ceramic and asbestos]
    • Y10T428/296—Rubber, cellulosic or silicic material in coating

Definitions

  • the invention relates to a packing to be arranged between movable machine parts. in particular for pumps. compressors or the like.
  • Object of the invention is to provide an improved packing which has a long life under extreme conditions too.
  • the packing of the invention comprises a core which contains a mixture of polytetrafluoroethylene and at least one element selected from the group consisting of silicone oil, graphite and molybdenum, and a coating of fibrous material surrounding said core.
  • the packing of the invention has a core which contains 60 to 80 7r by weight of polytetrafluoroethylene, 4.25 to 13.75 71 by weight of silicone oil, to 7: by weight of graphite. and 0.75 to 1.25 7! by weight of molybdenum disulfide.
  • the coating of fibrous material may be a. porous web or a porous tubular knitting.
  • FIG. 1 is a top plan view of an embodiment ofa packing according to the invention.
  • FIG. 2 is a vertical cross section along the line 2-2 in FIG. 1.
  • the packing comprises a core 1 and a coating 2.
  • the core 1 consists of a mixture of polytetrafluoroethylene and at least one element selected from the group consisting of silicone oil. graphite and molybdenum disulfide.
  • the porous coating 2 is of fibrous material such as, for instance, plastics, asbestos, vegetable or mineral fibres, in the form of a web or a tubular knitting.
  • the core of the packing contains 60 7: by weight of polytetrafluoroethylene. 13.75 7: by weight of silicone oil, 25 7: by weight of graphite, and L25 7: by weight of molybdenum disulfide.
  • the core of the packing contains a mixture of 80 7: by weight of polytetrafluoroethylene, 4.25 by weight of silicone oil, 15 7: by weight of graphite, and 0.75 7c by weight of molybdenum disulfide.
  • the core of the packing contains a mixture of 79.5 7c by weight of polytetrafluoroethylene, 4.25 7: by weight of silicone oil. 15 7c by weight of graphite, and 1.25 7: by weight of molybdenum disulfide.
  • the core of the packing contains 70 7: by weight of polytetrafluoroethylene, 9 7? by weight of silicone oil, 20 by weight of graphite and l 7: by weight of molybdenum disulfide.
  • the core of the packing is produced by extruding.
  • the core is produced as follows:
  • a powder of polytetrafluoroethylene is mechanically mixed with an aqueous dispersion of polytetrafluoroethylene and subsequently stirred to form a viscous mass. Then graphite and/or asbestos powder or the like are added to that mass and the latter is worked by means of a kneader into a pasty consistency.
  • a plastic in the form of granules of low friction coefficient is then charged into the kneader. whereupon the kneading process is continued until a homogeneous mass is formed.
  • This mass is then charged into an extrusion press.
  • the mass discharged from the extrusion press with the desired profile is then heated for a period of advantageously about one hour. ln this, the mass is heated to about 150C for about I hour and then air-dried.
  • a practical feature consists in the fact that a 30 71 dispersion of polytetrafluoroethylene of low friction coefficient is used.
  • the extruded material is rolled up and unrolled later for the application of the coating.
  • the permeability of the coating must be adjusted to the viscosity of the core. as the latter is heated during operation. due to the friction of the respective machine parts.
  • the adjustment can be effected by changing the mesh size of the web or knitted fabric.
  • Polytetrafluoroethylene is a polymerization product of tetrafluoroethylene. Fluor polymers have specific properties as compared to other polymers. not only because their temperatures of use are higher, but also because they are either insoluble or virtually resistant to swelling by nearly all solvents and are not affected by any of the conventional chemicals. it is recognized in this that polytetrafluoroethylene is not a thermoplastic in the usual sense of the term. It is characterized, when cooled off slowly. by high compressive strength and low permeability to gas. At fast cooling. the mass is tough and flexible, which is of particular advantage for the present invention.
  • the coating may be impregnated. as well. Suitable for this purpose is any given dispersion of plastics. for instance polytetrafluoroethylene.
  • the improved packing according to the invention is permanently ductile; it is further chemically stable and application is possible for temperature ranges between 50C and 250C.
  • a packing to be arranged between movable parts comprising a core which contains an homogenous mixture of polytetrafluoroethylene and at least one element selected from the group consisting of silicone oil. graphite and molybdenum disulfide forming a viscous mass. and a porous coating of fibrous material surrounding said core.
  • a packing according to claim 1 wherein the core consists essentially of polytetrafluoroethylene and at least one element selected from the group consisting of silicone oil, graphite and molybdenum disulfide forming a viscous mass, and a porous coating of fibrous material surrounding said core.
  • a packing according to claim 1 wherein said core contains 60 to 80% by weight of polytetrafluoroethylene, 4.25 to 13.75% by weight of silicone oil, 15 to 25% by weight of graphite and 0.75 to 1.25% by weight of molybdenum disulfide.
  • porous coating is a porous web of fibrous material selected from the group consisting of vegetable fibres, mineral fibres, asbestos fibres and such plastic fibres which establish a permanent porous structure of the web.
  • a packing according to claim 1 wherein said porous coating is a porous tubular knitting.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Sealing Devices (AREA)
  • Lubricants (AREA)
US406132A 1973-10-12 1973-10-12 Packing for movable machine parts Expired - Lifetime US3878031A (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
US406132A US3878031A (en) 1973-10-12 1973-10-12 Packing for movable machine parts
AT742074A AT334701B (de) 1973-10-12 1974-09-13 Packung zum abdichten beweglicher maschinenteile und verfahren zum herstellen einer solchen packung
GB4093774A GB1474976A (en) 1973-10-12 1974-09-19 Packing to be arranged between movable machine parts
DE2444847A DE2444847C2 (de) 1973-10-12 1974-09-19 Packung zum Abdichten beweglicher Maschinenteile
CH1276974A CH618249A5 (https=) 1973-10-12 1974-09-20
IT28168/74A IT1022693B (it) 1973-10-12 1974-10-08 Giarnizione per la tenuta di parti di macchina mobili con anima viscosa e rivestimento poroso

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US406132A US3878031A (en) 1973-10-12 1973-10-12 Packing for movable machine parts

Publications (1)

Publication Number Publication Date
US3878031A true US3878031A (en) 1975-04-15

Family

ID=23606662

Family Applications (1)

Application Number Title Priority Date Filing Date
US406132A Expired - Lifetime US3878031A (en) 1973-10-12 1973-10-12 Packing for movable machine parts

Country Status (6)

Country Link
US (1) US3878031A (https=)
AT (1) AT334701B (https=)
CH (1) CH618249A5 (https=)
DE (1) DE2444847C2 (https=)
GB (1) GB1474976A (https=)
IT (1) IT1022693B (https=)

Cited By (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4163825A (en) * 1976-12-07 1979-08-07 Chemiefaser Lenzing Aktiengesellschaft Threads or fibers of polytetrafluorethylene
US4331339A (en) * 1980-11-21 1982-05-25 Caterpillar Tractor Co. Seal assembly having a plastic annular sealing member with an integral sealing lip
US4596839A (en) * 1981-09-16 1986-06-24 Peters William E Elastomer PTFE composition
WO1987001309A1 (en) * 1985-08-30 1987-03-12 Peters William E Elastomer ptfe composition, articles, and manufacturing methods
DE3536235A1 (de) * 1985-10-10 1987-04-16 Chetra Industriebedarf Gmbh Verfahren zur herstellung einer packung
WO1987003515A1 (en) * 1985-12-09 1987-06-18 Peters William E Elastomer ptfe composition, articles, and manufacturing methods
AU585533B2 (en) * 1985-08-30 1989-06-22 Alphaflex Industries Inc. Molybdenum disulphide filled elastomer ptfe composition and automotive parts therefrom
DE4237886A1 (de) * 1992-09-11 1994-03-17 Mtu Muenchen Gmbh Einrichtung zur Abdichtung fluidisch unterschiedlich druckbeaufschlagter Räume zwischen relativ zueinander beweglichen Gehäusen, insbesondere von Flugtriebwerken
US5380015A (en) * 1993-12-17 1995-01-10 Federal-Mogul Corporation Machined shaft seal encased in an elastomeric sleeve
US5393819A (en) * 1994-02-25 1995-02-28 Alphaflex Industries Asphalt modifier
US5399598A (en) * 1994-03-03 1995-03-21 Alphaflex Industries Asphalt composition
US5418270A (en) * 1994-04-12 1995-05-23 Alphaflex Industries, Inc. Modified thermoplastic elastomeric compositions
EP0695899A1 (de) * 1994-07-01 1996-02-07 Itv -Institut Für Textil-Und Verfahrenstechnik Stopfbuchspackung
US5492336A (en) * 1993-04-20 1996-02-20 W. L. Gore & Associates, Inc. O-ring gasket material and method for making and using same
US5494301A (en) * 1993-04-20 1996-02-27 W. L. Gore & Associates, Inc. Wrapped composite gasket material
US5551706A (en) * 1993-04-20 1996-09-03 W. L. Gore & Associates, Inc. Composite gasket for sealing flanges and method for making and using same
US5645603A (en) * 1995-07-25 1997-07-08 Peters; William E. Method of enhancing physical properties of non-elastomeric thermoplastic materials and resulting compositions
US6688607B2 (en) 1997-04-18 2004-02-10 Henkel Loctite Corporation Material for sealing threaded pipe joints, and dispenser therefor
CN102775957A (zh) * 2011-05-13 2012-11-14 李学辉 一种盘根密封填料及其制备方法
CN103602311A (zh) * 2013-09-27 2014-02-26 马士民 一种可再循环使用的柔性纳米密封填料
CN103708098A (zh) * 2014-01-02 2014-04-09 李卿语 一种瓶盖密封垫
US20140175759A1 (en) * 2011-09-13 2014-06-26 Nok Corporation Gasket and sealing structure

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE9215026U1 (de) * 1992-11-04 1993-04-29 Latty International S.A., Orsay Dichtungsring
CN110939737A (zh) * 2019-12-05 2020-03-31 中国航发四川燃气涡轮研究院 一种有防剪切功能的膨胀石墨密封装置

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2217915A (en) * 1936-12-01 1940-10-15 Firm Elite Diamantwerke Ag Circular knitted web and method for its manufacture
US2578523A (en) * 1950-06-30 1951-12-11 Du Pont Polytetrafluoroethylene packing material and process for making same
US2691814A (en) * 1952-11-24 1954-10-19 Glacier Co Ltd Polytetrafluorethylene impregnated bearings
US2767768A (en) * 1952-08-01 1956-10-23 Kellogg M W Co Insulating compositions and method of forming same
US3534652A (en) * 1967-10-02 1970-10-20 Marlo Co Inc Braided high-temperature packing
US3646846A (en) * 1970-01-19 1972-03-07 George E Houghton Fibrous graphite packing
US3791658A (en) * 1971-05-07 1974-02-12 Marlo Co Inc Packings for pumps, valves, and the like

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2249981A (en) * 1939-06-15 1941-07-22 Chester M Roe Packing for stuffing boxes and the like
GB1194509A (en) * 1967-12-07 1970-06-10 Marlo Co Inc Improvements in or relating to Packings for Pumps, Valves and the like

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2217915A (en) * 1936-12-01 1940-10-15 Firm Elite Diamantwerke Ag Circular knitted web and method for its manufacture
US2578523A (en) * 1950-06-30 1951-12-11 Du Pont Polytetrafluoroethylene packing material and process for making same
US2767768A (en) * 1952-08-01 1956-10-23 Kellogg M W Co Insulating compositions and method of forming same
US2691814A (en) * 1952-11-24 1954-10-19 Glacier Co Ltd Polytetrafluorethylene impregnated bearings
US3534652A (en) * 1967-10-02 1970-10-20 Marlo Co Inc Braided high-temperature packing
US3646846A (en) * 1970-01-19 1972-03-07 George E Houghton Fibrous graphite packing
US3791658A (en) * 1971-05-07 1974-02-12 Marlo Co Inc Packings for pumps, valves, and the like

Cited By (26)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4163825A (en) * 1976-12-07 1979-08-07 Chemiefaser Lenzing Aktiengesellschaft Threads or fibers of polytetrafluorethylene
US4331339A (en) * 1980-11-21 1982-05-25 Caterpillar Tractor Co. Seal assembly having a plastic annular sealing member with an integral sealing lip
WO1982003670A1 (en) * 1980-11-21 1982-10-28 Harold L Reinsma Seal assembly having a plastic annular sealing member with an integral sealing lip
US4596839A (en) * 1981-09-16 1986-06-24 Peters William E Elastomer PTFE composition
WO1987001309A1 (en) * 1985-08-30 1987-03-12 Peters William E Elastomer ptfe composition, articles, and manufacturing methods
AU585533B2 (en) * 1985-08-30 1989-06-22 Alphaflex Industries Inc. Molybdenum disulphide filled elastomer ptfe composition and automotive parts therefrom
AT392136B (de) * 1985-10-10 1991-01-25 Chetra Gmbh Dichtungstechnik Verfahren zur herstellung einer kalibrierten packung
DE3536235A1 (de) * 1985-10-10 1987-04-16 Chetra Industriebedarf Gmbh Verfahren zur herstellung einer packung
WO1987003515A1 (en) * 1985-12-09 1987-06-18 Peters William E Elastomer ptfe composition, articles, and manufacturing methods
DE4237886A1 (de) * 1992-09-11 1994-03-17 Mtu Muenchen Gmbh Einrichtung zur Abdichtung fluidisch unterschiedlich druckbeaufschlagter Räume zwischen relativ zueinander beweglichen Gehäusen, insbesondere von Flugtriebwerken
US5492336A (en) * 1993-04-20 1996-02-20 W. L. Gore & Associates, Inc. O-ring gasket material and method for making and using same
US5551706A (en) * 1993-04-20 1996-09-03 W. L. Gore & Associates, Inc. Composite gasket for sealing flanges and method for making and using same
US5494301A (en) * 1993-04-20 1996-02-27 W. L. Gore & Associates, Inc. Wrapped composite gasket material
US5380015A (en) * 1993-12-17 1995-01-10 Federal-Mogul Corporation Machined shaft seal encased in an elastomeric sleeve
US5393819A (en) * 1994-02-25 1995-02-28 Alphaflex Industries Asphalt modifier
US5399598A (en) * 1994-03-03 1995-03-21 Alphaflex Industries Asphalt composition
US5418270A (en) * 1994-04-12 1995-05-23 Alphaflex Industries, Inc. Modified thermoplastic elastomeric compositions
EP0695899A1 (de) * 1994-07-01 1996-02-07 Itv -Institut Für Textil-Und Verfahrenstechnik Stopfbuchspackung
US5645603A (en) * 1995-07-25 1997-07-08 Peters; William E. Method of enhancing physical properties of non-elastomeric thermoplastic materials and resulting compositions
US6688607B2 (en) 1997-04-18 2004-02-10 Henkel Loctite Corporation Material for sealing threaded pipe joints, and dispenser therefor
US20040070154A1 (en) * 1997-04-18 2004-04-15 Loctite (R&D) Limited Method for sealing threaded pipe joints
US7168707B2 (en) 1997-04-18 2007-01-30 Loctite (R&D) Limited Method for sealing threaded pipe joints
CN102775957A (zh) * 2011-05-13 2012-11-14 李学辉 一种盘根密封填料及其制备方法
US20140175759A1 (en) * 2011-09-13 2014-06-26 Nok Corporation Gasket and sealing structure
CN103602311A (zh) * 2013-09-27 2014-02-26 马士民 一种可再循环使用的柔性纳米密封填料
CN103708098A (zh) * 2014-01-02 2014-04-09 李卿语 一种瓶盖密封垫

Also Published As

Publication number Publication date
DE2444847C2 (de) 1982-12-30
CH618249A5 (https=) 1980-07-15
GB1474976A (en) 1977-05-25
AT334701B (de) 1976-02-10
DE2444847A1 (de) 1975-04-17
IT1022693B (it) 1978-04-20
ATA742074A (de) 1976-05-15

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