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`BEDGEAR 1019
`IPR of U.S. Pat. No. 8,402,580
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`Stitch Notation For Warp Knits
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`1.3 Comparing sales of warp knits with woven and weft knits
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`The amount of total fabric produced worldwide per year is highest for woven fabrics, second highest
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`for weft knit fabrics, and least for warp knit fabrics. The major reason is that spun yarn cannot be
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`incorporated in warp knit at a high speed. When the DuPont Co. developed Qjmm®, a silk—lil(e yarn,
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`for example, they wanted to knit a fabric using a knit structure similar to those used to knit expensive
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`silk yarns. To establish this, the author was sent to New York, Philadelphia, Wilmington, Milan and
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`Rome to buy knitted fabrics made of silk yarn. Twenty—two silk fabrics (warp and weft) were bought
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`randomly (see Figure 1.7).
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`Twenty-two samples were purchased from New York,
`Philadelphia, Wilmington, Milan and Rome.
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`Breakdown of
`the Samples
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`75% Interlock
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`10% Milanese
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`5% Jersey
`10% Double Knit
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`Light
`(1 .5-1.6)
`9%
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`9%
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`Weight classification — goz/ydzz
`Medium
`Heavy
`Very heavy
`(2.2-2.9)
`(3.4-4.2)
`(5-10)
`36%
`32%
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`4%
`10%
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`Total Market believed to be as follows:
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`70% Interlock (weft knit)
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`17% Milanese (weft knit)
`5% Tricot Jersey (warp knit)
`5% Weft Knit Jersey (weft knit)
`3% Double Knit (weft knit)
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`Figure 1.7
`Study of silk knit market to obtain tricot goals
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`The Milanese machine was used to knit silk yarn with uniformity since the Milanese knit structure
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`diffuses the non—uniformity of a yarn. However, milanese machines are very slow and, as a result, the
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`cost of such fabrics is very high. Milanese silk fabrics are therefore best used for expensive dress wear.
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`Tricot silk fabrics are used as a glove fabric and, if printed, are used for dresses. However, piece-dyed
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`silk tricot fabrics have poor uniformity and are full of warp streaks. The weft knit interlock fabric
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`proved to be the most attractive as it was prepared with a high twist silk yarn. To expand and diversify
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`the tricot market, fabrics needed to be developed that are like silk weft interlock, and these soft silk-
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`like fabrics should have surface interest. Key points to remember:
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`Warp Knit Fabrics Technology
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`The author. Bharat J. Gajjar. was a Professor at Philadelphia University. Philadelphia. PA. USA.
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`and worked as a warp knit consultant (1992 — 2003). Awarded 20 patents in his name. mostly
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`related to warp knitting. he retired from E. I. DuPont de Nemours & Co. after 35 years (1956 —
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`1992) as a senior research Engineer (25 years in warp knit research. 5 years in weft knit research.
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`and 5 years in International marketing). Professor Gajjar invented the famous Delaware Stitch.
`the warp knit fabric which made Qiana“[“ world famous.
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`ISBN 978—1—885373—46—5
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`9 781885 373465
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