+

WO1997046817A1 - Article de scellement tubulaire - Google Patents

Article de scellement tubulaire Download PDF

Info

Publication number
WO1997046817A1
WO1997046817A1 PCT/GB1997/001545 GB9701545W WO9746817A1 WO 1997046817 A1 WO1997046817 A1 WO 1997046817A1 GB 9701545 W GB9701545 W GB 9701545W WO 9746817 A1 WO9746817 A1 WO 9746817A1
Authority
WO
WIPO (PCT)
Prior art keywords
gel
casing
article according
carrier
article
Prior art date
Application number
PCT/GB1997/001545
Other languages
English (en)
Inventor
Michael John Carpenter
Stéphane KLEIN
Frank James Lowe
Alan Roger Gay
Alistair Alfred Preston Sutherland
Original Assignee
Raychem Limited
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 Raychem Limited filed Critical Raychem Limited
Priority to AU30405/97A priority Critical patent/AU3040597A/en
Priority to EP97925172A priority patent/EP0901587A1/fr
Priority to JP10500344A priority patent/JP2000511619A/ja
Publication of WO1997046817A1 publication Critical patent/WO1997046817A1/fr

Links

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
    • F16J15/02—Sealings between relatively-stationary surfaces
    • F16J15/06—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces
    • F16J15/064—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces the packing combining the sealing function with other functions
    • 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
    • F16J15/02—Sealings between relatively-stationary surfaces
    • F16J15/021—Sealings between relatively-stationary surfaces with elastic packing
    • F16J15/022—Sealings between relatively-stationary surfaces with elastic packing characterised by structure or material
    • F16J15/024—Sealings between relatively-stationary surfaces with elastic packing characterised by structure or material the packing being locally weakened in order to increase elasticity
    • F16J15/027—Sealings between relatively-stationary surfaces with elastic packing characterised by structure or material the packing being locally weakened in order to increase elasticity and with a hollow profile

Definitions

  • This invention relates to tubular sealing articles which may be useful, for example as gaskets for environmental and/or electrical sealing, as hereinafter described.
  • the invention provides an article comprising an elongate body of gel sealant, a solid, porous, or tubular elongate carrier, and an elongate tubular casing, wherein the casing has interstices and either (a) the casing encloses the gel on the carrier and the gel is selected to be capable of protrusion through the casing interstices when the article is under compression and of retraction from such protrusion when the compression is removed; or (b) the casing is on the carrier and the body of gel at least partly encloses the casing on the carrier and is selected to be capable of deformation to expose enclosed portions of the casing when the article is under compression and of recovery to re-enclose the exposed portions when the compression is removed.
  • Articles according to this invention are convenient to handle in any desired orientation, being substantially “dry” to the touch on all sides when the gel is not compressed to protrude through the casing interstices.
  • Such articles have the further advantage that the tubular casing protects the gel from contamination on all sides (and even at its ends if the tubular casing ends are closed) thus eliminating the contaminatable exposed edges of a flat gel sheet in a "sandwich" construction between two open-cell layers described in WO-A-9416884 (MP1469).
  • the casing could, for example, be formed of open-cell polymeric foam, possibly a hollow tube whose wall is formed of such foam which has been stretched to receive a pre ⁇ formed body of the gel sealant about which the tube contracts when the stretching force is released.
  • preferred casings for the present purposes are formed of fabric.
  • Preferred articles according to the invention are those wherein the casing is a tubular fabric, preferably a woven, braided or knitted tubular fabric.
  • Non- woven fabrics could be used if desired, but it is generally preferred to use woven, braided or knitted tubular fabric, in which the size of the interstices can be more readily controlled.
  • Preferred articles according to the invention include those wherein the tubular fabric casing has been formed in situ, preferably by tubular weaving, braiding, or knitting around the elongate body of gel.
  • the fabric can be acceptably formed around the elongate body of gel, provided that the said carrier is present to support the gel and control its elongation, the carrier preferably being flexible and substantially unspringy to provide substantially "dead” bending of the articles to assume and retain the shapes required for use as gaskets in practice.
  • Suitable equipment, methods and parameters for the weaving, braiding, or knitting operation may be determined by those skilled in such technology, bearing in mind the need to avoid damaging or unacceptably deforming the gel.
  • a small-diameter (37.5mm) weft knitting machine may be mounted horizontally, downstream from an extruder of known design capable of extruding the gel in question.
  • a simple single jersey plain weft knitted tube may then be formed around an elongate profile of a gel as hereinafter described, as it is being extruded.
  • Knitting is the preferred method, since open fabric structures can be formed readily from relatively rigid monofilaments of polymer or single- or multi-stranded wire, which are relatively stable, and suitable equipment is already available, for example in rubber extrusion companies for reinforcing automotive hoses with weft-knitted Kevlar (Trade Mark) fabrics.
  • the elongate body of gel may be inserted into or formed within the pre-existing tubular fabric casing.
  • an extruded profile of the gel having the desired cross sectional shape with, or in this case possibly without, the aforementioned carrier could simply be inserted into a pre-existing length of the tubular fabric casing, preferably after expanding the casing somewhat, for example by lengthways compression of a braid.
  • the gel profile, with or without the carrier could be directly extruded or moulded into the pre-existing casing.
  • the preferred fabric casings may, for example, comprise flexible filaments, of any appropriate cross-sectional shape, not excluding tapes, spun yarns, monofilaments, and multi-filament yarns, which may be chosen from polymeric materials, preferably those which are relatively impervious to the extender fluids used in the preferred gels.
  • fabrics consisting of or including filaments of high-density polyethylene may be advantageous, and other materials such as medium-density polyethylene, polyesters, polyamides, or polypropylene may also be useful.
  • the fabric casing will preferably comprise substantially all polymeric filaments, but a proportion of glass, carbon fibre, or other filaments may be included for specific purposes if desired. Filaments which have significant resistance to abrasion or other mechanical damage could be advantageous in providing tough and durable gaskets.
  • the fabric casing comprises electrically conductive filaments, preferably metal filaments, or metal-coated polymeric filaments (e.g. silver-coated or nickel-coated polyamide filaments, known examples of which comprise 18% by weight of silver metal), or hybrid yarns of metal and polymer fibres.
  • electrically conductive filaments preferably metal filaments, or metal-coated polymeric filaments (e.g. silver-coated or nickel-coated polyamide filaments, known examples of which comprise 18% by weight of silver metal), or hybrid yarns of metal and polymer fibres.
  • Suitable alloys of metals such as nickel, copper, beryllium, or aluminium are known, alloys of beryllium and copper being especially preferred to provide highly resilient EMI gaskets in which the metal filaments resist compression set.
  • Other metals for example Monel alloys of nickel and copper, tin- plated phosphor bronze, or Ferex (Trade Mark of Chomerics) tin-plated copper-clad steel, may also be useful and may benefit from the protective presence of the gel reducing their interaction with certain corrosive environments, e.g. salt spray.
  • the casing and hence the article as a whole will preferably be flexible to provide advantageous versatility of positioning in use, although articles which are relatively or substantially rigid longitudinally may be useful for some purposes, provided that the tubular fabric is adequately compressible in the lateral sense to bring about the desired protrusion of the gels through the interstices of the fabric.
  • the elongate body of gel may be in any desired cross-sectional shape, regardless of whether the gel or the casing forms the outermost layer of the article.
  • Gel profiles having gas-containing, preferably hollow tubular, carriers which may be suitable for enclosing in the fabric casing according to the present invention are described in WO-A-9609483 (RK508) and other forms of gel profile having, for example, rod-like, sheet-like, or V- shaped carriers are described in our WO-A-9709391 (RK532), WO-A-9707350 (RK533), and PCT/GB97/00773 (RK537), and especially preferred are the gel profiles having low- moisture-content multi-filament synthetic polymeric yarn carriers described in our PCT/GB97/00775 (RK567), the disclosures of all of which are incorporated herein by reference.
  • the gel sealant material forming the said elongate body preferably comprises a silicone, polyurethane, or EPDM gel, or more preferably a thermoplastic oil-extended styrene-alkylene-styrene block co-polymer gel or an oil-extended methacrylate-alkylene- methacrylate block co-polymer gel.
  • the aforementioned methacrylate block co-polymer gels are new materials described in our WO-A-9700292 (RK 509), the disclosure of which is incorporated herein by reference.
  • the other gels mentioned above are known per se, for example from US-A- 4600261 and US-A-5140476 (polyurethane gels), US-A ⁇ ,634207, US-A-4680233, US-A- 4777063, and US-A-5079300 (silicone gels), US-A-5177143 (EPDM gels), and preferably from EP-A-0426658 (RK308 tri-block co-polymer gels with added PPO), WO-A-9305113 (RK451 tri-block co-polymer gels with added di-block), WO-A-9323472 (RK469 styrene- ethylene/propylene-styrene tri-block co-polymer gels), and WO-A-9418273 (RK
  • the gel forming the said elongate body will preferably have an ultimate elongation of at least 100%, preferably at least 150%, more preferably at least 200% , preferably with substantially elastic recovery up to at least 100% elongation. These elongation criteria are tested at room temperature by known methods, for example as described in the above- mentioned patent specifications.
  • the gel will usually have a Voland hardness within the range from 5 - 200 grammes, preferably 7 - 150 grammes, more preferably 10-100 grammes.
  • the preferred thermoplastic gels may be selected from visco-elastic materials of relatively high cohesive strength with elongation to break of at least 500%, preferably at least 750% , more preferably at least 1000%; elastic recovery to at least 100%, preferably at least 200%, elongation; and preferably zero slump at temperatures up to 100 , preferably up to 120°, more preferably up to 135°, and especially up to 150 Celsius.
  • These preferred thermoplastic gels are thus distinguished from commonly known viscous sealants such as tackified elastomer mastics and pressure- sensitive adhesives.
  • thermoplastic gel layer may preferably be self-supporting in the sense that it does not require an internal porous support of the kind used with known cross-linked polysiloxane gels, although the use of such a porous layer carrying the thermoplastic gel therewithin is not necessarily excluded.
  • the preferred gels may also have tensile strength, dynamic and/or storage moduli, and other characteristics which meet the criteria described in any or all of the aforementioned EP-A-0426658, WO-A-9305113, WO-A-9323472, and WO-A-9418273.
  • the articles are not limited to these specific uses, and may be used in any appropriate way.
  • Means for attaching the articles to the objects which they are to be in contact with in use may be provided, for example hooks or tie-wraps attached to or provided together with the elongate sealing articles of this invention.
  • the sealing articles may be fixed in place by means of adhesive, or may be located in a retaining groove from which part of the article may project, or into which part of the surface to be sealed against may be inserted, for example in a re-openable tongue-and- groove sealing arrangement. Because the gel tends to retract and therefore be protected by the casing whenever the compression is removed from the article, the articles according to this invention may be especially advantageous in circumstances where repeated opening and closing of a gasket seal may be desired.
  • Figure.1 illustrates schematically a generally D-shaped extruded profile of oil- extended tri-block copolymer gel 10 with a woven tubular fabric casing 11 of the aforementioned silver-coated filaments
  • Figure 2 shows schematically a substantially circular gel profile 20, which may have a solid internal support string or rod 21 as indicated by broken lines, with a braided fabric casing 22 of organic polymeric filaments such as nylon;
  • Figure 4 shows on the left a substantially round gel profile 40 enclosed by metallic fabric casing 41, indicated by crosses, in position to act as an environmental and EMI seal between two parts 42 and 43 of an electrically-shielding housing for electrical apparatus, the same arrangement being shown in closed position on the right of Figure 4, with the gel 40 under compression so that it projects through the interstices of the metallic fabric casing 41 to make the desired environmental seal against the housing parts 42, 43, in addition to the electrical contact between those parts and the metallic fabric casing 41.
  • a 37.5mm diameter Harry Lucas Textilmaschinen Model RHU knitting machine was set up as aforementioned downstream of an extruder producing an extrudate of a known gel of 12% styrene-ethylene/propylene-styrene triblock copolymer in FIN A A360B extender oil on a multi-filament low-moisture-content synthetic-polymer carrier of the kind described in the aforementioned PCT/GB97/00775, the extrudate being of sufficient diameter substantially to fill the fabric tube to be knitted by the knitting machine.
  • a single jersey plain weft-knitted fabric tube was then progressively knitted around the solidified extrudate using a 5-gauge machine (5 needles per 25.4mm) to knit 0.35mm diameter polyethylene terephthalate monofilaments at 10 courses per 25.4mm using a machine speed of 600 revolutions per minute.
  • the tension in the monofilaments was kept low at about 0.3 Newtons per Tex (Tex being the ISO standard for linear density of textile strands, calculated as the weight in grams of 1000 metres length), to avoid unacceptable cutting of the gel by the filaments during knitting.
  • Example 2 Example 2
  • the machine was run at a slower speed of 300 rpm to accommodate lower tensions so that the wire did not cut the gel.
  • Example 1 The knitting machine of Examples 1 and 2 was replaced with a 48-spool, vertical- track-plate, horizontal braiding machine, and yarns of 2-fold, 94 Tex Nylon 6,6 multi- filament with three ends per spool were braided around a gel extrudate similar to that of Example 1 using a tension of about 0.5 Newtons per Tex. In the relaxed state, the resulting braid gave an optical coverage of about 70% .
  • a circular weaving machine of the kind used to produce fire hoses may be used to weave a fabric tube around a vertically-fed gel profile similar to that of Example 1.
  • a weft-insertion weaving machine was set up in known manner to produce a 50mm- diameter fabric tube with knitted edge closure and locking thread, using 4-fold 110 Tex polyethylene terephthalate in the warp at 24 ends per 25.4mm and 3-fold 110 Tex polyethylene terephthalate in the weft at 18 picks (insertions) per 25.4mm.
  • the warp tension was about 0.8 Newtons per Tex and the weft tension on leaving the insertion needle was about 0.25 Newtons per Tex.
  • a gel profile similar to that of Example 1 and of appropriate diameter was inserted (or alternatively could be extruded or moulded) into this fabric tube, which gave an optical coverage of about 85% around the gel.
  • Example 6 A tubular carrier similar to that carrying the gel in Example 2 was first enclosed in a braided fabric of metal filaments using braiding methods and equipment known per se, and a layer of gel was applied thereover in a manner similar to that described in the aforementioned WO-A-9609483 to produce an article according to alternative (b) of the present invention.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Braiding, Manufacturing Of Bobbin-Net Or Lace, And Manufacturing Of Nets By Knotting (AREA)
  • Knitting Of Fabric (AREA)
  • Gasket Seals (AREA)

Abstract

Cet article, utile en tant que joint statique étanche au milieu ambiant, comprend un gel de scellement sous la forme d'un corps oblong (30, figure 3), un support de forme allongée, solide, poreux ou tubulaire (31) ainsi qu'une gaine tubulaire et de forme allongée (32). Cet article est caractérisé en ce que la gaine présente des interstices et soit (a) la gaine (32) enferme le gel (30) sur le support (31), le gel étant choisi pour saillir à travers les interstices de la gaine, lorsque l'on soumet l'article à une compression, et pour se rétracter d'une telle position saillante, lorsque cesse la compression, soit (b) la gaine est placée sur le support et le corps du gel enferme au moins partiellement la gaine sur le support, ce gel étant choisi pour se déformer et exposer des portions enfermées de la gaine, lorsque l'on soumet l'article à une compression, et pour reprendre sa forme initiale et enfermer à nouveau les portions exposées, lorsque cesse la compression.
PCT/GB1997/001545 1996-06-07 1997-06-06 Article de scellement tubulaire WO1997046817A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
AU30405/97A AU3040597A (en) 1996-06-07 1997-06-06 Tubular sealing article
EP97925172A EP0901587A1 (fr) 1996-06-07 1997-06-06 Article de scellement tubulaire
JP10500344A JP2000511619A (ja) 1996-06-07 1997-06-06 チューブ状封止物品

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GBGB9612298.1A GB9612298D0 (en) 1996-06-07 1996-06-07 Tubular sealing article
GB9612298.1 1996-06-07

Publications (1)

Publication Number Publication Date
WO1997046817A1 true WO1997046817A1 (fr) 1997-12-11

Family

ID=10795183

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1997/001545 WO1997046817A1 (fr) 1996-06-07 1997-06-06 Article de scellement tubulaire

Country Status (6)

Country Link
EP (1) EP0901587A1 (fr)
JP (1) JP2000511619A (fr)
AU (1) AU3040597A (fr)
CA (1) CA2253843A1 (fr)
GB (1) GB9612298D0 (fr)
WO (1) WO1997046817A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102020100652A1 (de) 2020-01-14 2021-09-09 Helga Wanzke Einsatzdichtung mit rundförmigem Sitz
US11250969B2 (en) 2017-06-21 2022-02-15 Acs Industries, Inc. Tubular all-wire weft-knit mesh sleeve with improved electrical continuity
DE102023004257A1 (de) 2022-11-07 2024-05-08 Sew-Eurodrive Gmbh & Co Kg Dichtelement und Antriebseinheit

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3479292B2 (ja) * 2001-03-28 2003-12-15 北川工業株式会社 パッキン

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4334259A (en) * 1980-08-11 1982-06-08 Management Assistance Inc. Discharge/ground button
WO1996009483A1 (fr) * 1994-09-21 1996-03-28 Raychem Limited Element d'etancheite
US5581048A (en) * 1984-11-28 1996-12-03 Hughes Missile Systems Company Corrosion resistant electromagnetic shielding gasket

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4334259A (en) * 1980-08-11 1982-06-08 Management Assistance Inc. Discharge/ground button
US5581048A (en) * 1984-11-28 1996-12-03 Hughes Missile Systems Company Corrosion resistant electromagnetic shielding gasket
WO1996009483A1 (fr) * 1994-09-21 1996-03-28 Raychem Limited Element d'etancheite

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11250969B2 (en) 2017-06-21 2022-02-15 Acs Industries, Inc. Tubular all-wire weft-knit mesh sleeve with improved electrical continuity
DE102020100652A1 (de) 2020-01-14 2021-09-09 Helga Wanzke Einsatzdichtung mit rundförmigem Sitz
DE102020100652B4 (de) 2020-01-14 2022-03-17 Helga Wanzke Dichtungsanordnung mit einer einsetzbaren Ringdichtung zur Außen-, Innen- oder Flanschabdichtung
DE102023004257A1 (de) 2022-11-07 2024-05-08 Sew-Eurodrive Gmbh & Co Kg Dichtelement und Antriebseinheit

Also Published As

Publication number Publication date
JP2000511619A (ja) 2000-09-05
GB9612298D0 (en) 1996-08-14
CA2253843A1 (fr) 1997-12-11
EP0901587A1 (fr) 1999-03-17
AU3040597A (en) 1998-01-05

Similar Documents

Publication Publication Date Title
KR100985729B1 (ko) 케이블 보호 슬리빙 구조
US5300337A (en) Wraparound closure device
US5178923A (en) Wraparound closure device
US5197370A (en) Abrasion resistant braided sleeve
CN1083960C (zh) 织物外套和其用于磨损保护的应用
EP1334302B1 (fr) Manchon avec fixations integrees
US4929478A (en) Protective fabric sleeves
US5603514A (en) Circular warp-knit electromagnetic emission-shielding gasket
JP2866734B2 (ja) 音響吸収性スリーブ
US8809682B2 (en) Divided conduit
HUP0400929A2 (en) Extendible drain members for grounding rfi/emi shielding
JPS63221031A (ja) 熱回復性スリーブおよびその用途
WO1993009281A1 (fr) Produits formes en tissu et leurs procedes de fabrication
EP1430336A1 (fr) Support de fibres optiques
US10283953B2 (en) Process for forming a divided conduit
EP0901587A1 (fr) Article de scellement tubulaire
CA2328450A1 (fr) Article tubulaire tresse a element de retenue
WO1992006235A1 (fr) Gaine tressee resistante a l'abrasion
EP0532500B1 (fr) Produit tresse et son procede de fabrication
EP2700134B1 (fr) Conduit divisé et procédé de formation de ce conduit
US6132867A (en) Gel sealing articles
EP0888505B1 (fr) Articles d'etancheite portant un gel
NZ616463B2 (en) Divided conduit and process for forming
JPH0672147A (ja) 窓ガラス用スタビライザー

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A1

Designated state(s): AU BR CA CN CZ HU IL JP KR MX NO NZ PL RU TR US

AL Designated countries for regional patents

Kind code of ref document: A1

Designated state(s): AT BE CH DE DK ES FI FR GB GR IE IT LU MC NL PT SE

DFPE Request for preliminary examination filed prior to expiration of 19th month from priority date (pct application filed before 20040101)
121 Ep: the epo has been informed by wipo that ep was designated in this application
WWE Wipo information: entry into national phase

Ref document number: 1997925172

Country of ref document: EP

ENP Entry into the national phase

Ref document number: 2253843

Country of ref document: CA

Ref country code: CA

Ref document number: 2253843

Kind code of ref document: A

Format of ref document f/p: F

WWP Wipo information: published in national office

Ref document number: 1997925172

Country of ref document: EP

WWW Wipo information: withdrawn in national office

Ref document number: 1997925172

Country of ref document: EP

点击 这是indexloc提供的php浏览器服务，不要输入任何密码和下载