EP0199552B1 - Procédé pour la simulation par ordinateur de l'apparence d'une étoffe tricot-chaîne - Google Patents

Procédé pour la simulation par ordinateur de l'apparence d'une étoffe tricot-chaîne Download PDF

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Publication number
EP0199552B1
EP0199552B1 EP86302889A EP86302889A EP0199552B1 EP 0199552 B1 EP0199552 B1 EP 0199552B1 EP 86302889 A EP86302889 A EP 86302889A EP 86302889 A EP86302889 A EP 86302889A EP 0199552 B1 EP0199552 B1 EP 0199552B1
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EP
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Prior art keywords
fabric
wale
yarn
property
average
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Expired - Lifetime
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EP86302889A
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German (de)
English (en)
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EP0199552A3 (en
EP0199552A2 (fr
Inventor
Harvey Louis Kliman
Royden Harold Pike
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EIDP Inc
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EI Du Pont de Nemours and Co
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    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04B—KNITTING
    • D04B37/00—Auxiliary apparatus or devices for use with knitting machines
    • D04B37/06—Auxiliary apparatus or devices for use with knitting machines with warp knitting machines
    • 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
    • D04B21/02—Pile fabrics or articles having similar surface features
    • D04B21/04—Pile fabrics or articles having similar surface features characterised by thread material

Definitions

  • This invention relates to simulating the appearance properties of a warp knit fabric based on properties of the yarn in the fabric.
  • the simulation is comparable to the actual fabric knit from yarn of those properties.
  • the present invention provides a method for simulating actual fabric appearance by just knowing the constituent yarn properties without having to make the actual fabric.
  • the method comprises the steps of obtaining a data set of yarn physical properties for each yarn in the warp knit fabric then programming a digital computer to average the yarn physical properties for each yarn in the fabric according to the stitch pattern of the fabric to produce a wale average property for each wale in the fabric.
  • the pixel density for the graphics display equipment associated with the computer is then calculated from the average wale properties and displayed to represent each wale in the fabric.
  • a warp-knit textile fabric as intended herein is best defined in terms of a stitch pattern as shown in Fig. 1. While many other patterns constituting warp-knitting are possible the one shown represents a jersey tricot warp knit construction. Knitting needle positions for each of five successive wales and courses for the front and back bars are represented in Fig. 1. The horizontal rows of dots represent courses 1-5 while the wales of the fabric are represented by vertical rows of dots A-G. More particularly, referring to Fig. 1 the stitch construction of the fabric is notationally set out and shows that the threads of the front bar indicated as 21-25 have back and forth movement to non-adjacent needles in successive courses and the threads of the back bar, indicated as 31-35 have similar movements.
  • the technology uses a Hewlett Packard HP9845 model 270 to print patterns which model the appearance of jersey warp knit fabrics.
  • the present invention provides a computer-aided method of predicting fabric appearance from physical or chemical properties of yarns used to knit a warp knit fabric and displaying such appearance, such fabric having a stitch pattern with courses and wales and each of said yarn properties having a contrast factor, said method comprising the steps of:
  • AD is the arbitrarily selected average print density desired for the simulation
  • Direct printing of simulations requires high resolution graphics and printing capability.
  • the Hewlett Packard HP9845 desktop computer meets both requirements with individual pixel control of graphics on the CRT and printer.
  • Resolution of the HP9845 printer is 77 pixels/inch in both X and Y directions.
  • Initial experiments with various patterns showed that printing alternate rows provided sufficient resolution (38.5 rows/inch vs. 50 wales/inch in the fabric) to represent each wale in a jersey warp knit fabric. Printing alternate rows gives the printouts a subtle linearity resembling the directionality of wales in a warp knit fabric.
  • the first step in the method is obtaining a data set consisting of a yarn property such as denier, modification ratio, yarn shrinkage, or dyeability for each yarn in the fabric.
  • the properties are then averaged according to the stitch pattern in the fabric to produce a wale average property for each wale in the fabric.
  • the simulation program then produces a printout in which the print density (fraction of pixels printed) in each row is given by the equation: Wherein
  • K the contrast factor
  • each yarn end for example, 21-25 in Fig. 1, in the fabric is essential for calculating wale average property (v).
  • v wale average property
  • front bar yarns are of more importance than back bar yarns in fabric uniformity because the back bar yarns in warp knit constructions are "sandwiched" in the fabric interior.
  • denier is the property being simulated, it has been found that front bar yarns make a 75% contribution to uniformity and back bar yarns a 25% contribution.
  • front bar yarns make essentially a 100% contribution to uniformity.
  • the weighted wale average property (in this case, denier) for wale C becomes:
  • wale average deniers are calculated according to equation 2 for each wale in the fabric and the pixel density is calculated according to equation 1.
  • the pixel density is displayed in a series of rows to represent each wale in the fabric as shown in Fig. 2 wherein the simulation of the fabric displaying streaks at locations 40 and 41 closely resembles a fabric knit of the actual yarns whose properties were used for the simulation.
  • the simulation was prepared on a Hewlett Packard HP9845 having a thermal printer programmed according to the flow charts shown in Fig. 4.
  • FIG. 3 An enlarged portion of Fig. 2 is shown in Fig. 3 wherein alternate rows are printed to give subtle linearity and one pixel is represented by a square as designated at 50.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Coloring (AREA)
  • Knitting Of Fabric (AREA)
  • Knitting Machines (AREA)
  • Treatment Of Fiber Materials (AREA)

Claims (1)

  1. Procédé, assisté par ordinateur, de prédiction de l'apparence d'un tissu à partir de propriétés physiques ou chimiques de fils utilisés pour tricoter un tricot à maille jetée et afficher une telle apparence, un tel tricot possédant un réseau de mailles comportant des rangées de mailles et des colonnes de mailles et chacune des propriétés desdits fils présentant un facteur de contraste, ledit procédé incluant les étapes consistant à:
    obtenir un ensemble de données pour au moins une propriété physique ou chimique des fils et son facteur de contraste associé pour chaque fil du tricot;
    équiper l'ordinateur d'une base de données qui inclut ladite propriété sélectionnée des fils et son facteur de contraste;
    former la moyenne de ladite propriété du fil en fonction dudit réseau de mailles de manière à produire une propriété moyenne pour chaque colonne de mailles du tricot;
    calculer la densité d'impression au moyen dudit ordinateur à partir desdites propriétés moyennes des colonnes de mailles et dudit facteur de contraste en utilisant la relation
    Figure imgb0010
    dans laquelle
    AD est la densité moyenne d'impression sélectionnée de façon arbitraire, désirée pour la simulation,
    K est le facteur de contraste, et
    Z=v-v7V, v désignant la valeur moyenne calculée de la propriété pour la rangée de maille qui est imprimée, et V la moyenne arithmétique de toutes les valeurs, calculée de la manière suivante:
    Figure imgb0011
    v désignant les données exprimées sous la forme de valeurs individuelles, et
    N désignant le nombre total de valeurs; et
    afficher la densité d'impression sous la forme d'un élément d'une rangée de points aléatoires servant à représenter chaque colonne de mailles dans ledit tricot à maille jetée, le nombre de pixels dans chaque rangée de points aléatoires étant proportionnel à la propriété moyenne pour chaque colonne de mailles dans ledit tricot, ce qui permet d'obtenir une simulation prédite de l'apparence du tricot, établie à partir desdits fils, lorsqu'on connaît les propriétés constitutives des fils.
EP86302889A 1985-04-18 1986-04-17 Procédé pour la simulation par ordinateur de l'apparence d'une étoffe tricot-chaîne Expired - Lifetime EP0199552B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US72459985A 1985-04-18 1985-04-18
US724599 1985-04-18

Publications (3)

Publication Number Publication Date
EP0199552A2 EP0199552A2 (fr) 1986-10-29
EP0199552A3 EP0199552A3 (en) 1987-11-04
EP0199552B1 true EP0199552B1 (fr) 1990-07-18

Family

ID=24911069

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86302889A Expired - Lifetime EP0199552B1 (fr) 1985-04-18 1986-04-17 Procédé pour la simulation par ordinateur de l'apparence d'une étoffe tricot-chaîne

Country Status (7)

Country Link
EP (1) EP0199552B1 (fr)
JP (1) JPS626969A (fr)
KR (1) KR860008319A (fr)
BR (1) BR8601696A (fr)
CA (1) CA1258530A (fr)
DE (1) DE3672660D1 (fr)
DK (1) DK176186A (fr)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5299133A (en) * 1990-05-22 1994-03-29 E. I. Du Pont De Nemours And Company Method for determining and controlling fiber luster properties
CH684129A5 (de) * 1992-06-18 1994-07-15 Zellweger Uster Ag Verfahren und Vorrichtung zur Beurteilung der Auswirkung von Garnfehlern auf Gewebe oder Gewirke.
US5671061A (en) * 1992-06-18 1997-09-23 Zellweger Luwa Ag Method and apparatus for assessing the effect of yarn faults on woven or knitted fabrics
US5557527A (en) * 1993-08-31 1996-09-17 Shima Seiki Manufacturing Ltd. Knit design system and a method for designing knit fabrics
US6130746A (en) * 1994-03-10 2000-10-10 Lawson-Hemphill, Inc. System and method for electronically evaluating predicted fabric qualities
WO1997047959A1 (fr) * 1996-06-12 1997-12-18 Zellweger Luwa Ag Procede pour l'evaluation des effets de defauts du fil sur des configurations textiles en surface
CN1211319A (zh) * 1996-10-15 1999-03-17 Cis图像处理有限责任公司 纱线和织物模拟系统
DE19718562A1 (de) * 1997-05-02 1998-11-05 Zweigle Dieter Vorrichtung zur Optimierung von Geweben aufgrund gemessener Garndaten und Optimierungsverfahren
DE19822321A1 (de) * 1998-05-19 1999-11-25 Stoll & Co H Verfahren zur Herstellung eines Gestrickstücks auf einer Strickmaschine
JP4366321B2 (ja) * 2005-02-18 2009-11-18 株式会社島精機製作所 ニット製品のデザイン装置とデザイン方法、およびそのプログラム
WO2008107440A1 (fr) * 2007-03-08 2008-09-12 Oerlikon Textile Gmbh & Co. Kg Procédé de simulation d'une image affichée d'un produit fibreux formé d'une fibre multicolore ainsi que dispositif pour la mise en œuvre du procédé et procédé de fabrication d'une fibre bcf

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1421911A (en) * 1972-06-02 1976-01-21 Wildt Mellor Bromley Ltd Preparation of patterns for knitting machines

Also Published As

Publication number Publication date
DK176186D0 (da) 1986-04-17
JPS626969A (ja) 1987-01-13
CA1258530A (fr) 1989-08-15
DK176186A (da) 1986-10-19
KR860008319A (ko) 1986-11-14
EP0199552A3 (en) 1987-11-04
BR8601696A (pt) 1986-12-16
DE3672660D1 (de) 1990-08-23
EP0199552A2 (fr) 1986-10-29

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