EP0199552B1 - Method of simulating by computer the appearance properties of a warp knit fabric - Google Patents
Method of simulating by computer the appearance properties of a warp knit fabric Download PDFInfo
- 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
- Authority
- EP
- European Patent Office
- Prior art keywords
- fabric
- wale
- yarn
- property
- average
- 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
Links
- 239000004744 fabric Substances 0.000 title claims description 54
- 238000000034 method Methods 0.000 title claims description 9
- 238000004088 simulation Methods 0.000 claims description 15
- 239000000126 substance Substances 0.000 claims description 4
- 239000000470 constituent Substances 0.000 claims description 3
- 238000012935 Averaging Methods 0.000 claims description 2
- 238000010276 construction Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000007639 printing Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 238000009940 knitting Methods 0.000 description 2
- 230000000704 physical effect Effects 0.000 description 2
- 230000000007 visual effect Effects 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000010017 direct printing Methods 0.000 description 1
- 239000007943 implant Substances 0.000 description 1
- 238000013383 initial experiment Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000007261 regionalization Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 239000004753 textile Substances 0.000 description 1
Images
Classifications
-
- 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.
Landscapes
- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Coloring (AREA)
- Knitting Of Fabric (AREA)
- Treatment Of Fiber Materials (AREA)
- Knitting Machines (AREA)
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 (en) | 1986-10-29 |
EP0199552A3 EP0199552A3 (en) | 1987-11-04 |
EP0199552B1 true EP0199552B1 (en) | 1990-07-18 |
Family
ID=24911069
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP86302889A Expired - Lifetime EP0199552B1 (en) | 1985-04-18 | 1986-04-17 | Method of simulating by computer the appearance properties of a warp knit fabric |
Country Status (7)
Country | Link |
---|---|
EP (1) | EP0199552B1 (pt) |
JP (1) | JPS626969A (pt) |
KR (1) | KR860008319A (pt) |
BR (1) | BR8601696A (pt) |
CA (1) | CA1258530A (pt) |
DE (1) | DE3672660D1 (pt) |
DK (1) | DK176186A (pt) |
Families Citing this family (11)
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 |
EP0904532B2 (de) * | 1996-06-12 | 2007-11-21 | Uster Technologies AG | Verfahren zur beurteilung der auswirkungen von garnfehlern auf textile flächengebilde |
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 (de) * | 2007-03-08 | 2008-09-12 | Oerlikon Textile Gmbh & Co. Kg | Verfahren zur simulation eines erscheinungsbildes eines aus einem mehrfarbigen faden gebildeten faserproduktes sowie vorrichtung zur durchführung des verfahrens und verfahren zur herstellung eines bcf-fadens |
Family Cites Families (1)
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 |
-
1986
- 1986-04-15 BR BR8601696A patent/BR8601696A/pt unknown
- 1986-04-17 EP EP86302889A patent/EP0199552B1/en not_active Expired - Lifetime
- 1986-04-17 DK DK176186A patent/DK176186A/da not_active Application Discontinuation
- 1986-04-17 KR KR1019860002948A patent/KR860008319A/ko not_active Application Discontinuation
- 1986-04-17 DE DE8686302889T patent/DE3672660D1/de not_active Expired - Lifetime
- 1986-04-17 CA CA000506975A patent/CA1258530A/en not_active Expired
- 1986-04-18 JP JP61088435A patent/JPS626969A/ja active Pending
Also Published As
Publication number | Publication date |
---|---|
KR860008319A (ko) | 1986-11-14 |
EP0199552A2 (en) | 1986-10-29 |
BR8601696A (pt) | 1986-12-16 |
JPS626969A (ja) | 1987-01-13 |
DE3672660D1 (de) | 1990-08-23 |
DK176186A (da) | 1986-10-19 |
DK176186D0 (da) | 1986-04-17 |
CA1258530A (en) | 1989-08-15 |
EP0199552A3 (en) | 1987-11-04 |
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