High speed texturing of synthetic continuous filament yarn
阅读：182发布：2022-03-09
专利汇可以提供High speed texturing of synthetic continuous filament yarn专利检索，专利查询，专利分析的服务。并且A filamentary yarn is false twist textured by being heat set in a twisted configuration. The twist is imparted to the yarn by contact with the inner surface of a rotating friction insert having a profiled friction surface, the insert being mounted in a rotatable cup. The threadline contacts the friction surface at an angle to the surface and passes from the friction surface through a guide and out of the interior of the friction insert.，下面是High speed texturing of synthetic continuous filament yarn专利的具体信息内容。
1. A process for false twisting yarn by heat setting while it is in a twisted state which comprises advancing a yarn under tension from a source thereof through a temperature zone, contacting said yarn with the interior profiled friction surface of a hollow rotating member, imparting to said yarn both a torsional force and a longitudinal force in the direction of yarn traveled by progressing said yarn diagonally across said profiled friction surface, the path of said yarn in accordance with the formula r1/( r1 - R(Cos theta 2 - Cos theta 1)) a wherein a is less than, or equal to, 1.10 and wherein: r1 is perpendicular distance of front edge of friction surface from axis of rotation; R is radius of curvature of friction surface; theta 1 is angle between plane containing front edge of the friction surface and a line drawn from the axis of rotation, perpendicular thereto, to center of curvature of the friction surface; theta 2 is angle between plane containing the back edge of the friction surface and a line drawn from the axis of rotation, to the center of curvature of friction surface; and simultaneously false twisting said yarn by a substantially static rolling friction generated by a substantially nonslipping contact between said yarns and said rotating friction surface, passing said yarn from said interior profiled friction surface and guiding said yarn under tension out of said interior friction surface on the said side it entered into contact with said friction surface.
2. The process of claim 1 wherein the threadline initially contacts said friction surface on one side of said rotating member and is guided out of the interior of said rotating member on the same side of said rotating member, not in contact with said friction surface.
3. The process of claim 1 wherein the tension upstream of the point of initial contact with the interior profiled friction surface of said rotating member is substantially equal to the downstream tension.
4. The process of claim 1 wherein the yarn approaches the profiled friction surface of the rotating member at an angle of from about 75* to 105* with respect to the axis of rotation of said rotating member.
5. The process of claim 1 wherein a is less than, or equal to, 1.05.
6. The process of claim 1 wherein the yarn contacts the friction surface across substantially the whole width of said friction surface.
7. An apparatus for imparting false twist to textile filaments comprising a radially symmetrical, rotatable member having a substantially circular opening at at least one end thereof, the axis of rotation and axis of symmetry of said rotatable member being coincidental with the axis of symmetry of said circular opening, a friction surface within said opening of said member with said surface having a surface profile defined by the following formula: r1/( r1 - R(Cos theta 2 - Cos theta 1)) a wherein a is less than, or equal to, 1.10 and wherein: r1 is perpendicular distance of front edge of friction surface from axis of rotation; R is radius of curvature of friction surface; theta 1 is angle between plane containing front edge of the friction surface and a line drawn from the axis of rotation, perpendicular thereto, to center of curvature of the friction surface; theta 2 is angle between plane containing the back edge of the friction surface and a line drawn from the axis of rotation, to the center of curvature of friction surface; means for advancing a yarn from a source thereof into said opening into contact with said friction surface, an internal guide means positioned within said opening behind said friction surface to guide said yarn under tension over said friction surface and means for guiding said yarn out of the interior of said friction surface on the same side it entered into the interior of said friction surface.
8. The apparatus of claim 7 wherein said friction surface is the interior surface of an insert mounted within the opening of said rotatable member, the axis of symmetry of said insert and said member being coincidental.
9. The apparatus of claim 7 wherein the guide means is rotatably mounted such that the axis of rotation of said guide means and said rotatable member are coincidental.
10. The apparatus of claim 8 wherein the ratio of the diameter of the interior opening of the friction insert to the width of the friction surface of said insert is from about 2 to 40.
11. The apparatus of claim 7 wherein a is less than, or equal to, 1.05.
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