WO2020081557A1 - Capteur tactile capacitif tricoté et textile (actif) à capteur tactile capacitif - Google Patents

Capteur tactile capacitif tricoté et textile (actif) à capteur tactile capacitif Download PDF

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Publication number
WO2020081557A1
WO2020081557A1 PCT/US2019/056315 US2019056315W WO2020081557A1 WO 2020081557 A1 WO2020081557 A1 WO 2020081557A1 US 2019056315 W US2019056315 W US 2019056315W WO 2020081557 A1 WO2020081557 A1 WO 2020081557A1
Authority
WO
WIPO (PCT)
Prior art keywords
warp
touch sensor
knitted
capacitive touch
fabric
Prior art date
Application number
PCT/US2019/056315
Other languages
English (en)
Inventor
Genevieve DION
Richard Vallett
Christina KARA
Stephanie RODGERS
Zoltan Olah
William FREI
Original Assignee
Drexel University
Apex Mills, Inc.
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 Drexel University, Apex Mills, Inc. filed Critical Drexel University
Priority to US17/285,123 priority Critical patent/US20210355613A1/en
Publication of WO2020081557A1 publication Critical patent/WO2020081557A1/fr

Links

Classifications

    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04B—KNITTING
    • D04B21/00—Warp knitting processes for the production of fabrics or articles not dependent on the use of particular machines; Fabrics or articles defined by such processes
    • D04B21/20—Warp knitting processes for the production of fabrics or articles not dependent on the use of particular machines; Fabrics or articles defined by such processes specially adapted for knitting articles of particular configuration
    • D04B21/202—Warp knitting processes for the production of fabrics or articles not dependent on the use of particular machines; Fabrics or articles defined by such processes specially adapted for knitting articles of particular configuration warp knitted yarns
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04B—KNITTING
    • D04B21/00—Warp knitting processes for the production of fabrics or articles not dependent on the use of particular machines; Fabrics or articles defined by such processes
    • D04B21/14—Fabrics characterised by the incorporation by knitting, in one or more thread, fleece, or fabric layers, of reinforcing, binding, or decorative threads; Fabrics incorporating small auxiliary elements, e.g. for decorative purposes
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04B—KNITTING
    • D04B21/00—Warp knitting processes for the production of fabrics or articles not dependent on the use of particular machines; Fabrics or articles defined by such processes
    • D04B21/20—Warp knitting processes for the production of fabrics or articles not dependent on the use of particular machines; Fabrics or articles defined by such processes specially adapted for knitting articles of particular configuration
    • 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
    • D10B2401/00—Physical properties
    • D10B2401/16—Physical properties antistatic; conductive
    • 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
    • D10B2403/00—Details of fabric structure established in the fabric forming process
    • D10B2403/02—Cross-sectional features
    • D10B2403/021—Lofty fabric with equidistantly spaced front and back plies, e.g. spacer fabrics
    • 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
    • D10B2403/00—Details of fabric structure established in the fabric forming process
    • D10B2403/02—Cross-sectional features
    • D10B2403/024—Fabric incorporating additional compounds
    • D10B2403/0243—Fabric incorporating additional compounds enhancing functional properties
    • D10B2403/02431—Fabric incorporating additional compounds enhancing functional properties with electronic components, e.g. sensors or switches
    • 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
    • D10B2505/00—Industrial
    • D10B2505/08—Upholstery, mattresses

Definitions

  • knitted fabrics are known to offer hybrid characteristics of conformity by having multi-stretch possibilities vs. woven fabrics.
  • Weft knit formed through a single cone (end) of yarn via independent needles.
  • the type of stitch used in weft knitting affects both the appearance and properties of the knitted fabric.
  • the basic stitches are plain, or jersey; rib; and purl.
  • plain stitch each loop is drawn through others to the same side of the fabric.
  • rib stitch loops of the same course are drawn to both sides of the fabric.
  • the web is formed by two sets of needles, arranged opposite to each other and fed by the same thread, with each needle in one circle taking up a position between its counterparts in the other.
  • the interlock structure is a variant of the rib form in which two threads are alternately knitted by the opposite needles so that interlocking occurs.
  • loops are drawn to opposite sides of the fabric, which, on both sides, has the appearance of the back of a plain stitch fabric.
  • Jacquard mechanisms can be attached to knitting machines, so that individual needles can be controlled for each course or for every two, and complicated patterns can be knitted.
  • To form a tuck stitch a completed loop is not discharged from some of the needles in each course, and loops accumulating on these needles are later discharged together.
  • the plaited stitch is made by feeding two threads into the same hook, so that one thread shows on the one side of the fabric and the other on the opposite side.
  • a float stitch is produced by missing interlooping over a series of needles so that the thread floats over a few loops in each course.
  • Warp knitting may be advantageous for some applications, and in particular, warp knitting may increase speed of production and thus may be advantageous in functional textiles.
  • a warp-knitted capacitive touch sensor system includes conductive and non- conductive yarns using interlooped stitches that are interlaced, intertwined, and/or spliced into a single conductive pathway having only two connection points to the electronic interface device, across a desired width or length of the textile material.
  • FIG. 1 shows an example of a warp knitted structure.
  • FIG. 2 shows a warp knitting machine
  • FIG. 3 shows some details of a warp-knitting machine.
  • FIG. 4 shows a spacer fabric structure.
  • FIG. 5 shows an example warp-knit structure.
  • FIG. 6 shows some example application fabric structures.
  • Warp knitting is the sequential formation and interlinking of loops in an axial direction on a lateral array of needles with at least one separate thread being supplied to each needle via a warp beam.
  • the loops may be joined together in a width-wise direction by moving the threads back and forth between adjacent needles.
  • Warp knitting machines may have 1 - 8 warp beams that deliver yarn to the needle bed systems.
  • Guide bars can shift from right to left called shog. Typical shog movements can be from 1 to 3 needle positions (overlap), however may be up to eleven for bars not forming loops (underlap).
  • Warp knitting represents the fastest method of producing fabric from yarns. Warp knitting differs from weft knitting in that unlike weft knitting, each warp knitting needle loops its own thread.
  • the warp-knitting machine needles produce parallel rows of loops simultaneously that are interlocked in a zigzag pattern.
  • the fabric is produced in sheet or flat form using one or more sets of warp yarns. The yarns are fed from warp beams to a row of needles extending across the width of the machine.
  • FIG. 1 shows a warp-knitted fabric 100 with a single yarn 110 highlighted just to show its pattern clearly, and which could be conductive between nonconductive yarns 120.
  • All the yarns may be knitted in course simultaneously and for the purpose of shifting yarn, a guide may be used.
  • Warp knitting yarns are supplied to the knitting zone parallel to the selvedge of the fabric, i.e. in the direction of the wales. As stated earlier, a knitting needle often draws the new yarn loop through the knitted loop formed by another end of the yarn in the previous knitting cycle.
  • Warp-knitting may have several advantages over weft knitting: (1) Due to the simultaneous knit, production rate may be much higher than the weft knitting, (2) The yarn may be in crisscross form to the adjacent wale line, so that dimensional stability will be much higher; (3) The elongation of the fabric may be less.
  • a warp-knitted structure may be made up of two parts. The first is the stitch itself, which is formed by wrapping the yarn around the needle and drawing it through the previously knitted loop. This wrapping of the yarn is called an overlap.
  • FIG. 1 shows the path taken by the eyelet of one yarn guide traveling through the needle line, making a lateral overlap (shog) and making a return swing. This movement wraps the yarn around the needle ready for the knock-over displacement.
  • the second part of stitch formation is the length of yarn linking together the stitches and this is termed the underlap, which is formed by the lateral movement of the yarns across the needles.
  • the length of the under lap is defined in terms of needle spaces. The longer the underlap, the more it lies at right angles to the fabric length axis. The longer the underlap for a given warp the greater the increase in lateral fabric stability, conversely a shorter under lap reduces the width-wise stability and strength and increases the lengthways stability of the fabric.
  • the length of the underlap also influences the fabric weight.
  • more yarn has to be supplied to the knitting needles.
  • the underlap crosses and covers more wales on its way, with the result that the fabric becomes heavier, thicker and denser. Since the underlap is connected to the root of the stitch, it causes a lateral displacement in the root of the stitch due to the warp tension. The reciprocating movements of the yarn, therefore, cause the stitch of each knitted course to incline in the same direction, alternately to the left and to the right.
  • the second set of yarns is usually employed.
  • the second set is usually moved in the opposite direction to the first in order to help balance the lateral forces on the needles.
  • the length of the underlap need not necessarily be the same for both sets of yarns.
  • spacer fabrics 400 are warp knitted double face construction in which both fabric faces 410, 420 are interconnected by the spacer yarn 430.
  • Spacer fabrics 400 may be like a compounded fabric combination that is knitted all at one time; a face - middle - back. Spacer fabrics may be successful in getting market share as substitutes for laminates, in sports and safety wear, as basic constructions for composites for filter and in the medical field.
  • Both fabric faces may be equal or different, of dense structure, plain or patterned with small design or with a napped surface on one side.
  • Both faces or one can be of open structure, even with different mesh size on each side.
  • connection of both face fabric generally mono filament yarn is used, however a multi filament can also be used.
  • the thickness of the spacer yarn depends amongst other criteria on distance between the fabric space and whether the space is knitted with one guide bar or with two guide bars each one knitting in opposition to each other.
  • warp knitting machines 200 are generally flat and comparatively more complicated than weft knitting machines.
  • a warp-knitting machine 200 is in some respects, a limiting form of a multi-feeder weft knitting machine, where the number of feeders 210 equals the number of needles or knitting elements 220 in use, so that the needles must move in unison. It is also a form of mechanical crocheting device, which produces interconnected crochet chains to form the fabric 230.
  • Raschel machines Two common types of warp knitting machines are the Tricot and Raschel machines, as well as spacer double needle bar Raschel type. Raschel machines are useful because they can process all yarn types in all forms (filament, staple, combed, carded, etc.). Warp knitting can also be used to make pile fabrics often used for upholstery.
  • Machine gauge up to 24 to 40 (here gauge is number of needles per inch)
  • Machine speed is high (up to 3500 courses per min)
  • Machines are wider and comparatively simple structures are produced.
  • Warp beams are positioned at the back side of the machine.
  • Capacitive touch sensors may be made using multi bar raschel knitting machine, which may be a non-electronic mechanical type of knitting machine. These raschel machines can create intricate patterns that are run by patterning chains and spot beams of various type of yarn types and combinations including conductive yarns. Pattern changes may be much more difficult and not as easily done as they are on electronic knitting machines. A primary advantage with raschel machines is that yarn can lay-in over more needles than do the electronic jacquard machines.
  • Multi-bar warp knitting offers design flexibility and/or intricate, possibly larger patterns that provide the ability to create a graphic button type and custom shapes using a single end of carbon yarn.
  • Any type of yarn can be used.
  • Machines are narrower and comparatively lower speed (up to 2000 courses per min)
  • Warp beams are positioned at the top of the machine.
  • FIG. 3 shows a close up of the guide 310, sinker 320, latch needle 330, and cloth 340 as mentioned above.
  • Spacer fabrics may be knitted on warp knitting raschel machines with two needle bars. Depending of the product and its requirement, a minimum of four guide bars normally, however three to eight guide bars are possible. The distance between the needle bars is adjustable in certain ranges and is different for the various machine types for knitting spacer fabrics from 1mm - 55mm.
  • FIG. 5 shows a CAD example of a continuous electronic pathway using a 36- gauge double needle bar raschel spacer structure formation using 5 total bars of warped yarn; 2 bars for conductive threads (in black), and 3 bars for non-conductive yarns.
  • the number of bars used for the continuous conductive pathway and graphic pattern to be integrated or interlooped is dependent on the complexity of the design. Typically, the more yarn bars, the more complicated the design.
  • the overlap and underlap of this specific example has a repeat of 405 courses to accommodate the desired design parameters of the conductive pathway; length and width. This creates a wide band of non-conductive yarns along with a narrow band of conductive yarns.
  • the conductive bands move needle positions at intervals that creates sequential underlap and overlap stitches across the width direction.
  • the conductive yarn stitch formation for the conductive yarn warp yarns shift in left and right directions from the main chain stitch conductive yarn placement. These vertical chain stitches can have various exposed and unexposed lengths depending on the user interface programing and dimensions of the end product.
  • a continuous conductive pathway is achieved by the exaggerated left and right (lateral and/or oblique) underlap motions are called shog (shifting), of the conductive yarn bars # 3 and # 4.
  • the underlap of bar 3# intertwines with the previous loop of bar # 4 splicing the non-conductive yarns together on one course line.
  • the normal limit for loop forming guide bars in tricot machines is four needle spaces, but they may be as long as eleven needle spaces for bars not forming loops.”
  • the 640-denier conductive yarn used in this example is a nylon 6,6 40 filament twisted core with approximately one micron of carbon suffused onto the surface. Carbon, Silver, stainless steel and graphene type yarns are ideal for capacitive touch user interface, where low power is required.
  • bars #2, #5, and #6 are texturized polyester 167/48 denier was used.
  • An outcome of the warp knit spacer functional fabric may include the following:
  • the non-conductive yarn type can be any type of cellulosic or synthetic filament, staple, or blended yarn.
  • [0069] - is that it can be designed so that the location of the conductive yarn and therefore, the conductive pathway, can be spaced at intervals appropriate for the end item dimensions. Vertical(Y) horizontal(X) and thickness (Z) can be localized for specific user interface outcomes. [0070] - Given the proper yarn spacing (i.e., design), It can be cut and sewn into traditional textile end products such as apparel, medical devices.
  • the non-conductive yarn can have performance attributes such as; moisture management, antimicrobial, flame retardant, cut resistant, UV retardant to enhance the performance of the end product.
  • the warp-knitting lateral loop overlaps and underlapping of the conductive yarn beams may create a serpentine or other pattern that forms a continuous conductive pathway with only one input and one output connector required.
  • the current car seat offered in global marketplace may use a three layer structure 600: a top layer 610 that is often plush and made of polyester; a middle layer 620 made of polyurethane foam; and a bottom layer 630, a polyamide warp knitting...or alternately a polyester melt adhesive 650, polyester fiber structure 660, and polyester melt adhesive. 670.
  • Interior lining e.g. doors, columns, back seat covering, dashboard, sunshield, roof liner and similar areas.
  • Warp knitted fabric for use with apparel, fashion fabric and technical textiles, with specific applications being formal, sporting wear, sporting gear, backpack, footwear.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Knitting Of Fabric (AREA)
  • General Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Human Computer Interaction (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)

Abstract

L'invention concerne un système de capteur tactile capacitif tricoté en chaîne comprenant des fils conducteurs et non conducteurs employant des mailles en boucles croisées qui sont entrelacées, entrecroisées, et/ou épissées en un seul trajet conducteur ayant seulement deux points de connexion au dispositif d'interface électronique, sur une largeur ou une longueur souhaitée du matériau textile.
PCT/US2019/056315 2018-10-15 2019-10-15 Capteur tactile capacitif tricoté et textile (actif) à capteur tactile capacitif WO2020081557A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US17/285,123 US20210355613A1 (en) 2018-10-15 2019-10-15 Knitted capacitive touch sensor and capacitive touch sensor (active) textile

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US201862745643P 2018-10-15 2018-10-15
US62/745,643 2018-10-15

Publications (1)

Publication Number Publication Date
WO2020081557A1 true WO2020081557A1 (fr) 2020-04-23

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PCT/US2019/056315 WO2020081557A1 (fr) 2018-10-15 2019-10-15 Capteur tactile capacitif tricoté et textile (actif) à capteur tactile capacitif

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WO (1) WO2020081557A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2594254A (en) * 2020-04-20 2021-10-27 Prevayl Ltd Fabric article and method of making the same

Families Citing this family (2)

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US11819064B2 (en) * 2018-11-30 2023-11-21 Nike, Inc. Upper torso garment with varied tuck binder knit structure
US20220110822A1 (en) * 2020-10-13 2022-04-14 InCare, LLC Inflation-Mediated Pressure Therapy Garment

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US20090018428A1 (en) * 2003-05-19 2009-01-15 Umist Ventures Limited Knitted transducer devices
US20140296749A1 (en) * 2013-03-26 2014-10-02 Lawrence G. Reid, Jr. Body Monitoring System and Method
US20160000374A1 (en) * 2013-03-05 2016-01-07 Drexel University Smart knitted fabrics
US20170038322A1 (en) * 2015-08-07 2017-02-09 Sanko Tekstil Isletmeleri San. Ve Tic. A.S. Fabric with degradable sensor
US20170107647A1 (en) * 2014-03-24 2017-04-20 Deutsche Institute Für Textil-Und Faserforschung Denkendorf Sensory yarn
WO2017095861A1 (fr) * 2015-11-30 2017-06-08 Drexel University Capteur tactile textile
US20170249033A1 (en) * 2014-09-30 2017-08-31 Apple Inc. Fabric sensing device
US20180073172A1 (en) * 2015-05-14 2018-03-15 Gunze Limited Conductive stretchable knitted fabric and harness for conduction
US20180153033A1 (en) * 2016-11-28 2018-05-31 Panasonic intellectual property Management co., Ltd Flexible wiring board, electronic device, and fiber product
US20180195218A1 (en) * 2015-06-29 2018-07-12 Apple Inc. Warp Knit Fabrics with Variable Path Weft Strands

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US7161084B2 (en) * 2000-03-30 2007-01-09 Electrotextiles Company Limited Detector constructed from electrically conducting fabric
FI20070313A0 (fi) * 2007-04-23 2007-04-23 Neule Apu Oy Valaistusjärjestely tekstiilirakenteen yhteydessä
IT201600094342A1 (it) * 2016-09-20 2018-03-20 Plug & Wear Srl Metodo per la produzione di un sensore tessile

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20090018428A1 (en) * 2003-05-19 2009-01-15 Umist Ventures Limited Knitted transducer devices
US20160000374A1 (en) * 2013-03-05 2016-01-07 Drexel University Smart knitted fabrics
US20140296749A1 (en) * 2013-03-26 2014-10-02 Lawrence G. Reid, Jr. Body Monitoring System and Method
US20170107647A1 (en) * 2014-03-24 2017-04-20 Deutsche Institute Für Textil-Und Faserforschung Denkendorf Sensory yarn
US20170249033A1 (en) * 2014-09-30 2017-08-31 Apple Inc. Fabric sensing device
US20180073172A1 (en) * 2015-05-14 2018-03-15 Gunze Limited Conductive stretchable knitted fabric and harness for conduction
US20180195218A1 (en) * 2015-06-29 2018-07-12 Apple Inc. Warp Knit Fabrics with Variable Path Weft Strands
US20170038322A1 (en) * 2015-08-07 2017-02-09 Sanko Tekstil Isletmeleri San. Ve Tic. A.S. Fabric with degradable sensor
WO2017095861A1 (fr) * 2015-11-30 2017-06-08 Drexel University Capteur tactile textile
US20180153033A1 (en) * 2016-11-28 2018-05-31 Panasonic intellectual property Management co., Ltd Flexible wiring board, electronic device, and fiber product

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2594254A (en) * 2020-04-20 2021-10-27 Prevayl Ltd Fabric article and method of making the same
GB2594254B (en) * 2020-04-20 2023-01-18 Prevayl Innovations Ltd Fabric article and method of making the same

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