Hoe Hin Chuah from 7746 Spruce Haven Dr, Houston, TX 77095, age 74, Phone: (281) 935-4067

Process For Making High Stretch And Elastic Knitted Fabrics From Polytrimethylene Terephthalate

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US Patent:

6702864, Mar 9, 2004

Filed:

Sep 21, 2001

Appl. No.:

09/957981

Inventors:

Charles Chiu-Hsiung Hwo - Sugar Land TX
Hoe Hin Chuah - Houston TX
Houston Slade Brown - Houston TX
Kailash Dangayach - Houston TX
Paul Karol Casey - Katy TX

Assignee:

Shell Oil Company - Houston TX

International Classification:

D06P 352

US Classification:

8495, 8497, 8922, 8931

Abstract:

This invention relates to a process of making high stretch elastic knitted fabrics from (PTT) which comprises: (a) making a drawn textured yarn with an elongation to break of 30 to 60 percent by: (i) spinning a polytrimethylene terephthalate polymer into a partially oriented yarn, and (ii) draw texturing the yarn in a false-twisting texturing machine at a draw ratio of 1. 05 to 2. 0, and a yarn temperature of 50 to 200Â C. using a either a contact heater or a non-contact heater, and (b) knitting the yarn into a fabric composed of intermeshing loops of the yarn wherein the stitch length is from 22 cm/100 stitches to 26 cm/100 stitches, and (c) scouring the knitted fabric, and (d) drying the fabric on a belt, and (e) dyeing the knitted fabric at atmospheric pressure by dispersing a dye and the fabric in water and increasing the temperature, and (f) finishing the dyed knitted fabric according to the specific procedure and (g) drying the fabric on a belt.

Spin Draw Process Of Making Partially Oriented Yarns From Polytrimethylene Terephthalate

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US Patent:

6740270, May 25, 2004

Filed:

Oct 3, 2001

Appl. No.:

09/970117

Inventors:

Charles Chiu-Hsiung Hwo - Sugar Land TX
Hoe Hin Chuah - Houston TX
Houston Slade Brown - Houston TX
Kailash Dangayach - Houston TX
Paul Karol Casey - Katy TX

Assignee:

Shell Oil Company - Houston TX

International Classification:

D01D 5084

US Classification:

264103, 2642107, 2642108, 26421112, 26421117

Abstract:

This invention is a spin draw process for making partially oriented yarn from polytrimethylene terephthalate (PTT) which comprises the steps of: (a) extruding and spinning PTT in forming a monofilament or multifilament yarn therefrom, (b) heating the yarn by contacting it with a first pair of godets moving at a speed in and at a temperature set to give a yarn temperature above the glass transition temperature and less than the cold crystallization temperature of PTT, (c) drawing the yarn between the first godet pair and a second pair of godets moving at a speed and a temperature of from 45 to 120Â C. and having a draw ratio of 0. 7 to 3. 0, and (d) winding the yarns at the speed of 1 to 15% less than that of the second godet pair at a yarn temperature less than the glass transition temperature of PTT yarn.

Process For Making Stable Polytrimethylene Terephthalate Packages

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US Patent:

7022273, Apr 4, 2006

Filed:

Feb 19, 2003

Appl. No.:

10/369023

Inventors:

Kailash Dangayach - Houston TX, US
Kathleen Suzanne Kiibler - Katy TX, US
Michele Buscemi - Grand Leez, BE
Dieter Wiemer - Wermelskirchen, DE
Hansjorg Meise - Köln, DE
Hoe Hin Chuah - Houston TX, US
Adriano Birosel Pangelinan - Houston TX, US
Houston Slade Brown - Houston TX, US

Assignee:

Shell Oil Company - Houston TX

International Classification:

B29D 28/00
B29C 49/08
B29C 47/88

US Classification:

264103, 2642107, 2642108, 26421112, 26421117

Abstract:

A process for the production and for the winding of one polyester yarn, preferably multi-filament yarn, which comprises at least about 85 weight %, in relation to the total weight of the polyester yarn, of polytrimethylene terephthalate (PTT) wherein said process is characterized in that filaments of said polyester yarn is heat-treated, before it is wound on a bobbin, at a temperature in the range of about 70 C. to about 180 C. The method of accomplishing this is by heating the godets that are used in the spinning part of the process, preferably the last pair of godets, to relax the yarns so that the yarn package will not shrink significantly during storage and/or transportation. It is thus possible to obtain at least one PTT yarn package with long-term stability during storage and which is insensitive against elevated temperatures during storage and transport.

Process For Preparing Poly(Trimethylene Terephthalate) Carpet Yarn

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US Patent:

20020012763, Jan 31, 2002

Filed:

Jun 6, 2001

Appl. No.:

09/875633

Inventors:

Hoe Chuah - Houston TX, US

International Classification:

B32B003/02
D04H011/00

US Classification:

428/097000

Abstract:

Poly(trimethylene terephthalate) is formed into a bulk continuous filament yarn by a process comprising: (a) melt-spinning poly(trimethylene terephthalate) at a temperature within the range of about 240 to about 280 C. to produce a plurality of spun filaments; (b) cooling the spun filaments; (c) converging the spun filaments into a yarn; (d) drawing the yarn at a first draw ratio within the range of about 1.01 to about 2 in a first drawing stage defined by at least one feed roller and at least one first draw roller, each of said at least one feed roller operated at a temperature less than about 100 C. and each of said at least one draw roller heated to a temperature greater than the temperature of said at least one feed roller and within the range of about 50 to about 150 C.; (e) subsequently drawing the yarn at a second draw ratio of at least about 2.2 times that of the first draw ratio in a second drawing stage defined by said at least one first draw roller and at least one second draw roller, each of said at least one second draw roller heated to a temperature greater than said at least one first draw roller and within the range of about 100 to about 200 C.; and (e) winding the drawn yarns, after optionally texturing the drawn yarns. The invention process enables the production of poly(trimethylene terephthalate)-based carpet having the bulk and resiliency of nylon as well as the stain resistance and low static generation of polyester.

Soft And Stretchable Textile Fabrics Made From Polytrimethylene Terephthalate

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US Patent:

20020116802, Aug 29, 2002

Filed:

Jul 3, 2001

Appl. No.:

09/898831

Inventors:

Marc Moerman - Brugge, BE
Hoe Chuah - Houston TX, US

International Classification:

D02G001/20

US Classification:

028/258000

Abstract:

In this invention, we found unexpectedly that when PTT fiber is drawn,textured and set under certain conditions, the fabrics made from textured fibers by this texturing process possess stretch and hand which is much better than current commercially available PBT and PET stretch fabrics, and better than PTT textured fibers made under similar conditions without the setting step. Specifically, the invention describes the spinning of PTT polymer into yarn with an elongation of 60 to 160% and draw-texturing the yarn using a false-twist draw-textured yarn machine at a draw ratio of 1.02 to 1.6 and a yarn temperature of 120 to 160 C., preferably 130 to 150 C. The yarn is further set, usually with a secondary heater, at a yarn temperature of 70 to 130 C., preferably 85 to 115 C., prior to winding. Then knitted fabrics are dyed, tentor-set, and finished with fabric softener. This invention is different from the above teachings in that the PTT yarn is draw-textured in a false-twist machine. The yarn is crimped (textured) at a much lower first heater temperature of 130 to 160 C. than described in the above prior art, is set with a secondary heater at 70 to 130 C. Fabrics made from the set yarn have as good or better stretch and better hand than fabrics made from the un-set yarn.

Process For Preparing Poly(Trimethylene Terephthalate) Staple Fibers For Conversion Into Carpets

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US Patent:

20030197303, Oct 23, 2003

Filed:

Mar 27, 2003

Appl. No.:

10/400317

Inventors:

Hoe Hin Chuah - Houston TX, US
Jerry Wayne Secrist - Houston TX, US

International Classification:

B29C047/00

US Classification:

264/177130, 264/210800, 264/210200

Abstract:

This invention is a process for the production of staple fibers from poly(trimethylene terephthalate) for conversion into carpets which comprises: (a) extruding poly(trimethylene terephthalate) at a melt temperature of 240 to 280 C. into round, trilobal, delta, multi-lobal, or hollow cross section staple fiber tow, (b) quenching the fiber tow such that the undrawn filament tow has a crystallinity of 25%, preferably 20%, (c) prior to drawing, heating the fiber tow to temperature of 35 C. to 65 C., preferably between 35 and 55 C., to control crystallization, and (d) drawing the staple fiber tow into staple fibers.

Process For Preparing Poly(Trimethylene Terephthalate) Staple Fibers For Conversion Into Carpets

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US Patent:

20060197253, Sep 7, 2006

Filed:

Mar 2, 2006

Appl. No.:

11/366641

Inventors:

Hoe Hin Chuah - Houston TX, US
Jerry Wayne Secrist - Houston TX, US

International Classification:

B29C 47/88

US Classification:

264211140, 264211220

Abstract:

This invention is a process for the production of staple fibers from poly(trimethylene terephthalate) for conversion into carpets which comprises: (a) extruding poly(trimethylene terephthalate) at a melt temperature of 240 to 280 C. into round, trilobal, delta, multi-lobal, or hollow cross section staple fiber tow, (b) quenching the fiber tow such that the undrawn filament tow has a crystallinity of ≦25%, preferably ≦20%, (c) prior to drawing, heating the fiber tow to temperature of 35 C. to 65 C., preferably between 35 and 55 C., to control crystallization, and (d) drawing the staple fiber tow into staple fibers.

Polyester Yarn And Process For Producing

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US Patent:

20070148450, Jun 28, 2007

Filed:

Dec 22, 2006

Appl. No.:

11/615518

Inventors:

Hoe CHUAH - Houston TX, US

International Classification:

D02G 3/00
D01F 6/62

US Classification:

428364000, 264103000, 264211120, 264211140, 264290500

Abstract:

A multi-filament poly(trimethylene terephthalate) yarn is provided. The poly(trimethylene terephthalate) yarn has a crystal orientation function of at least 0.6 and an elongation at break of between 65% and 110%. A process for producing the yarn is also provided in which poly(triemethylene terephthalate) is melt-spun into a multi-filament yarn, the yarn is cooled to a yarn temperature of less than 50 C., and the cooled yarn is taken-up at a take-up speed of at least 3500 m/min while maintaining the temperature of the yarn at a yarn temperature of less than 50 C.