EP3879020A1 - Tresse plate électroconductrice - Google Patents

Tresse plate électroconductrice Download PDF

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Publication number
EP3879020A1
EP3879020A1 EP21162025.7A EP21162025A EP3879020A1 EP 3879020 A1 EP3879020 A1 EP 3879020A1 EP 21162025 A EP21162025 A EP 21162025A EP 3879020 A1 EP3879020 A1 EP 3879020A1
Authority
EP
European Patent Office
Prior art keywords
threads
plastic
flat braid
braid
textile material
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.)
Pending
Application number
EP21162025.7A
Other languages
German (de)
English (en)
Inventor
Wolfgang Zierhut
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.)
AWM ZIERHUT GBR
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
Publication of EP3879020A1 publication Critical patent/EP3879020A1/fr
Pending legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04C—BRAIDING OR MANUFACTURE OF LACE, INCLUDING BOBBIN-NET OR CARBONISED LACE; BRAIDING MACHINES; BRAID; LACE
    • D04C1/00—Braid or lace, e.g. pillow-lace; Processes for the manufacture thereof
    • D04C1/02—Braid or lace, e.g. pillow-lace; Processes for the manufacture thereof made from particular materials
    • D—TEXTILES; PAPER
    • D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B2101/00—Inorganic fibres
    • D10B2101/20—Metallic fibres

Definitions

  • the invention relates to an electrically conductive textile material, in particular a braid for dissipating static charge, consisting of plastic and metal threads, the textile material being designed as a flat braid in which the plastic threads are materially connected to one another at connection points.
  • a textile material designed as a round braid is made from DE 91 04 795 U1 known.
  • a round braid made of plastic and metal threads is described, which is intended for the dissipation of static charges, in particular in work shoes, and which is considered to be advantageous over previously used woven tapes. It is true that such a round braid is considerably more flexible than a relatively stiff fabric.
  • tests with such a round braid have shown that it has a certain surface roughness which tends to chafe when used in a shoe, which can be uncomfortable for the wearer of the shoe. It has also been found that the conductivity of the round braid can already reach its limits when a new shoe is manufactured, which results in an increased reject rate in shoe production.
  • the invention is based on the object of further developing an electrically conductive flat braid of the type mentioned at the outset in such a way that no significant longitudinal stretching occurs under tensile loading.
  • the textile material is designed as a flat braid, in which the plastic threads are at least partially connected to one another in a materially bonded manner at connection points.
  • the textile material is designed as a flat braid, in which the plastic threads are at least partially connected to one another in a materially bonded manner at connection points.
  • central end threads which braid around the plastic and metal threads of the flat braid are additionally provided.
  • the flat braid remains flexible, but the threads are supported against one another, so that the braid is not fanned out when the load is compressed.
  • the steel threads are less stressed and their risk of breakage is thus reduced.
  • the surface roughness of the flat braid is reduced, which is improved when the flat braid is preferably used as a grounding conductor for static electrical charges in safety clothing, in particular safety shoes and boots.
  • the middle end threads reduce the stretchability of the flat braid without reducing its advantages over the previously used fabrics.
  • the connection points of the plastic threads are preferably created by a chemical and / or thermomechanical treatment of the flat braid.
  • the connection points between the plastic threads can be point-shaped or linear, but do not occupy such a circumference that the threads would, as it were, clump together.
  • the plastic threads are preferably made of polyester and the metal threads of stainless steel.
  • the ratio of plastic to metal threads can be in the range from 80:20 to 50:50 and is preferably about 60:40.
  • the fineness of the threads is advantageously in the range of Nm 50/2.
  • the plastic and metal threads are preferably spun into a yarn from which the flat braid is then braided.
  • a flat braid with the above properties has an electrical resistance in the range from 500 to 3,000 ⁇ / m.
  • the flat braid has a width in the range from 5 to 15 mm and has a double braid.
  • the number of lichen can advantageously be in the range from 50 to 70 per 10 cm of length.
  • a number of threads of 82 has proven to be advantageous, of which 66 threads on 33 bobbins form the already known flat braid and 16 additional central end threads stabilize the braid and reduce its elasticity.
  • the flat braid is expediently treated with a hydrophobic agent, preferably a paraffin-containing agent.
  • a hydrophobic agent preferably a paraffin-containing agent.
  • the treatment is advantageously carried out by a discontinuous exhaust process at a temperature of less than 80 ° C. and a residence time of up to 60 minutes at the final temperature. Additional treatment components can be acetic acid or citric acid.
  • the plastic and metal threads as well as the central end threads are each put under tensile stress during the production of the flat braid by springs in bobbins of a braiding machine, the tensile stress of the central end threads being 40% to 60% greater than the tensile stress of the plastic and metal threads, especially about 50% larger.
  • the tension of the plastic and metal threads can be about 80 g and the tension of the middle end threads about 120 g. The tensile forces acting on the threads slow them down during braiding.
  • the thread tensioning spring in the clapper is precisely adjusted and aligned with the corresponding tensile force by the spring.
  • the rocker arm clapper is a single pull.
  • the method according to the invention for producing a flat braid of the type described above provides that, after braiding, the flat braid is treated chemically and / or thermomechanically to create material connection points between the plastic threads.
  • the desired properties can also be achieved exclusively through a thermomechanical treatment, but it has been found that a chemical pretreatment allows the use of lower temperatures in the thermomechanical treatment.
  • the flat braid is therefore preferably first passed through a liquid bath consisting of water and acetone in a mixing ratio of about 10: 1 before it is passed through a pair of heated rollers.
  • the roller temperature should be in the range from 30 to 60.degree. C. and is preferably 35 to 40.degree. C. in the case of a wet chemical pretreatment.
  • the plastic and metal threads as well as the central end threads are put under tensile stress during the production of the flat braid by springs in the bobbins of a braiding machine, the tensile stress of the central end threads being 40% to 60% greater than the tensile stress of the plastic and metal threads, especially about 50% larger.
  • the tension of the plastic and metal threads can be about 80 g and the tension of the middle end threads about 120 g.
  • the production line shown schematically in the drawing essentially consists of a conventional braiding machine 10, in which yarn 14 stored on a plurality of bobbins 12 is braided into a flat braid 16, a liquid bath 18 and a heated pair of rollers 20 % polyester and about 40% stainless steel fibers with a cross-section of no more than 12 micrometers.
  • the yarn count is Nm 50/2 and the flat braid 16 is double-braided with a width of about 10 mm and a number of braids of 62 per 10 cm with a number of threads of 66.
  • the threads 14 of the flat braid 16 are braided with central end threads 24, which are fed from spools 26 arranged below the plane of the spools 12 via guide tubes 28.
  • the braid 16 is passed through the liquid bath 18, which consists of a mixture of water and acetone in a ratio of approximately 10: 1.
  • the polyester material of the yarn 14 is partially dissolved, so that it is possible to work with relatively low temperatures in the range of 35-40 ° C. during the subsequent heat setting in the heated pair of rollers 20.
  • the heat setting creates a cohesive connection between adjacent threads in places so that the braid 16 retains its high flexibility on the one hand, but on the other hand becomes resistant to thread breakage under repeated compressive loads, since there is mutual support of the thread threads.
  • Fig. 2 shows a short section of the flat braid 16 in an enlarged view.
  • a conventional braid (not shown)
  • the fibers 14 are materially connected to one another at many points 22, so that a dense, but nevertheless highly flexible flat braid results.
  • the fibers 14 remain in the composite shown, as a result of which the load on individual fibers or yarns 14 is reduced and breaks in the steel fibers contained do not occur or occur less frequently than before.
  • the cohesive connection of the fibers at many connection points prevents relative movement and thus rubbing of the fibers against one another.
  • the middle end threads 24 braid around the threads of the yarn 14 and reduce the extensibility of the flat braid 16.
  • Fig. 3 shows a detailed view of the flat braid 16 with the central end threads 24, which run in the longitudinal direction of the flat braid 16, and the plastic and metal threads 14 which braid around the former.
  • the flat braid 16 is shown quite loosely, while it is actually made quite solid.
  • the central end threads 24 are axially loaded when there is tensile load in the direction of the longitudinal extension of the flat braid 16 and stabilize the flat braid 16 in such a way that it does not stretch, or only slightly, and remains dimensionally stable. Stabilization by the central end threads 24 also takes place in the transverse direction to the longitudinal extension of the flat braid 16. This prevents cyclical loads in particular on the metal threads, so that the longevity and functional reliability of the flat braid 16 is improved.
  • the flat braid In the case of a preferred use of the flat braid, it is incorporated on the side of the upper leather in the interior of a safety shoe in such a way that it protrudes into the footwell about 5 cm above an assumed shoe insert. It can be sewn directly to the upper leather in the front part of the shoe. Since the flat braid is flexible, it adapts to every shoe shape. The flat braid is then inserted through a slot in the (not conductive) insole pulled through and attached to the underside of the insole. This section of the flat braid should be about 5 cm long. Finally, an electrically conductive rubber sole is glued to the underside of the insole with electrically conductive adhesive.
  • the invention relates to an electrically conductive textile material, in particular braid for dissipating static charge, consisting of plastic and metal threads 14.
  • the textile material is designed as a flat braid 16 in which the plastic threads 14 are at least partially connected to one another at connection points.
  • the plastic and metal threads of the flat braid be provided with central end threads that braid around the flat braid.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Textile Engineering (AREA)
  • Braiding, Manufacturing Of Bobbin-Net Or Lace, And Manufacturing Of Nets By Knotting (AREA)
EP21162025.7A 2020-03-12 2021-03-11 Tresse plate électroconductrice Pending EP3879020A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102020106838.7A DE102020106838A1 (de) 2020-03-12 2020-03-12 Elektrisch leitfähiges Flachgeflecht

Publications (1)

Publication Number Publication Date
EP3879020A1 true EP3879020A1 (fr) 2021-09-15

Family

ID=74871243

Family Applications (1)

Application Number Title Priority Date Filing Date
EP21162025.7A Pending EP3879020A1 (fr) 2020-03-12 2021-03-11 Tresse plate électroconductrice

Country Status (2)

Country Link
EP (1) EP3879020A1 (fr)
DE (1) DE102020106838A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2257649A (en) * 1939-11-18 1941-09-30 Nat Standard Co Reinforcing element
DE9104795U1 (de) 1990-08-06 1991-07-18 Genitex Gesellschaft für Entwicklung, Herstellung und Vertrieb von technischen Textilien mbH, 6000 Frankfurt Textiles Leitband mit Stahlfaseranteil zur Ableitung statischer Ladung im Arbeitsschutzbereich
US5899134A (en) * 1997-09-15 1999-05-04 Auburn University Braided fabric and method of forming
DE102006051001A1 (de) 2006-10-26 2008-04-30 Wolfgang Zierhut Elektrisch leitfähiges Flachgeflecht
KR20150130656A (ko) * 2014-05-14 2015-11-24 주식회사 삼성인더스트리 윤활성이 우수한 그랜드 패킹 및 그 제조방법

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IE35809B1 (en) 1970-11-27 1976-05-26 Dow Badische Co Laminate filament and fabric prepared therefrom
JP2003060386A (ja) 2001-07-27 2003-02-28 Three M Innovative Properties Co 電磁波シールド用被覆体
DE202006020401U1 (de) 2005-04-11 2008-07-24 W. Zimmermann Gmbh & Co. Kg Elektrisch leitfähiges Garn

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2257649A (en) * 1939-11-18 1941-09-30 Nat Standard Co Reinforcing element
DE9104795U1 (de) 1990-08-06 1991-07-18 Genitex Gesellschaft für Entwicklung, Herstellung und Vertrieb von technischen Textilien mbH, 6000 Frankfurt Textiles Leitband mit Stahlfaseranteil zur Ableitung statischer Ladung im Arbeitsschutzbereich
US5899134A (en) * 1997-09-15 1999-05-04 Auburn University Braided fabric and method of forming
DE102006051001A1 (de) 2006-10-26 2008-04-30 Wolfgang Zierhut Elektrisch leitfähiges Flachgeflecht
KR20150130656A (ko) * 2014-05-14 2015-11-24 주식회사 삼성인더스트리 윤활성이 우수한 그랜드 패킹 및 그 제조방법

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
"Wirkerei und Strickerei, Netzen und Filetstrickerei, Maschinenflechten U. Maschinenklöppeln, Flecht- Und Klöppelmaschinen, Samt, Plüsch, Künstliche Pelze, Die Herstellung Der Teppiche, Stickmaschinen", 21 November 2013, ISBN: 978-3-662-29465-9, article EBERLE CARL ET AL: "Wirkerei und Strickerei, Netzen und Filetstrickerei, Maschinenflechten U. Maschinenklöppeln, Flecht- Und Klöppelmaschinen, Samt, Plüsch, Künstliche Pelze, Die Herstellung Der Teppiche, Stickmaschinen", pages: 319 - 320, XP055826542 *

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