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AssigneeShell Oil Company
InventorsKailash Dangayach, Kathleen Suzanne Kiibler, Michele Buscemi, Dieter Wiemer, Hansjorg Meise, Hoe Hin Chuah, Adriano Birosel Pangelinan, Houston Slade Brown
Estimating the term…
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.
A process for the spinning and winding of polyester yarn which is comprised of at least about 85 weight %, in relation to the total weight of the polyester yarn, of polytrimethylene terephthalate wherein said process comprises extruding polytrimethylene terephthalate, spinning the polytrimethylene terephthalate into yarn wherein the yarn is wrapped around at least one pair of godets, heat-treating said yarn at a winding tension in the range of 0.01 gm/denier to 0.02 gm/denier.
A process for the spinning and winding of polyester yarn which is comprised of at least about 85 weight %, in relation to the total weight of the polyester yarn, of polytrimethylene terephthalate wherein said process comprises extruding polytrimethylene terephthalate, spinning the polytrimethylene terephthalate into yarn, heat-treating said yarn at a winding tension in the range of 0.01 gm/denier to 0.02 gm/denier.
Dependencies are inferred from the claim text.