A false-twisted low-fused polyester yarn has a non-untwisted part having a twist in a false-twist direction, an over-untwisted part having a twist in a direction opposite to the false-twist direction, and a non-twisted crimped part having no twist, alternately disposed along the longitudinal direction of the yarn, the average length of the non-untwisted part being no more than 7 mm, the average length of the over-untwisted part being at least 7 mm, and the degree of fusion-bonding in the yarn longitudinal direction being no more than 50%.

The present invention discloses a free-cut warp-knitted fabric and use thereof. The warp-knitted fabric is at least knitted using a yarn of a front guide bar and a yarn of a back guide bar, wherein the yarn of the front guide bar and/or the yarn of the back guide bar is a crimped fiber having a stretch elongation of 30% to 120% and a stretch recovery not less than 15%, and an underlap formed by the yarn of the front guide bar and an underlap formed by the yarn of the back guide bar have opposite directions in the same course. The warp-knitted fabric of the present invention has proper elongation and stretchability, and has good washing durability; and the fabric after cutting has raveled edges, is not easy to curl in the horizontal direction, has good wearing comfort, and can be widely used to fabricate various garments.

The present invention provides a crimped polyamide yarn to which it is possible, using fibers that include low water absorption polyamide, to impart a stretch property and pliability such that it is possible for the inherent stretch properties of the crimped yarn to be appropriately expressed in a woven or knit fabric. The crimped polyamide yarn of the present invention is a side-by-side composite yarn which includes at least 40 mass % of low water absorption polyamide having an average of water absorption ratio of 5% or less at a temperature of 30 C. and a relative humidity (RH) of 90%, and in which the low water absorption polyamide is at least one component. The yarn is false-twisted, and has a crimp elongation ratio of 25% or more.

A method for preparing full-dull cotton-like polyester fibers includes: sequentially passing a full-dull polyester POY fiber and a full-dull polyester FDY fiber through a first yarn guide, a yarn guide tube, a second yarn guide, a first yarn feeding roller, pre-entangling, a second yarn feeding roller, a first deformation hot box, a cooling plate, a false twister, a third yarn feeding roller, a middle entangling device, a setting hot box, a setting yarn feeding roller, oiling, and DTY winding and forming to obtain the same. The first and second yarn guides are both yarn guide wheels; a tow is wound around the first yarn feeding roller for 2-3 turns; an inferior angle of the tow before and after contacting a groove bottom of the second yarn guide is 140-160; a linear velocity ratio of the first yarn feeding roller to the second yarn feeding roller is 1.05-1.06.

The present invention relates to a manufacturing method of a unique textured yarn by upgrading the equipment and processing the modified single-material precursor, the textured yarn thereof, and the fabric made with the textured yarn thereof. According to the method, titanium dioxide is added into a precursor of PET pre-oriented yarn with single filament DPF<0.5 to form the first precursor. Then, the first precursor is fed into a flat conveying roller, and then into a differential roller, and then into an accelerating roller to form a dark and light double colored textured yarn with linen-like appearance and tone. Then, the dark and light double colored textured yarn is conveyed to a heater for heating and setting, and then conveyed to a false twisting machine for processing. Finally, it is conveyed to a nozzle for spraying.

A device for controlling yarn feeding tension of a false-twist texturing machine, including a support frame, whose two sides are symmetrically and rotatably provided with two support roller groups, respectively. A tensioning roller assembly is slidably arranged at an inner side of the support frame. A lifting frame assembly is slidably arranged on the support frame to drive the tensioning roller assembly to move upward. Two dustproof cover assemblies are symmetrically arranged on two side of a top of the support frame. The tensioning roller assembly includes a tensioning roller, whose outer peripheral surface is provided with annular guide channels evenly spaced apart. Both ends of the tensioning roller are respectively provided with sliders. Two sides of the support frame are respectively provided with rectangular slideways fitting the sliders. The sliders are each provided with an annular protrusion coaxial with the tensioning roller.

The present invention discloses a free-cut warp-knitted fabric and use thereof. The warp-knitted fabric is at least knitted using a yarn of a front guide bar and a yarn of a back guide bar, wherein the yarn of the front guide bar and/or the yarn of the back guide bar is a crimped fiber having a stretch elongation of 30% to 120% and a stretch recovery not less than 15%, and an underlap formed by the yarn of the front guide bar and an underlap formed by the yarn of the back guide bar have opposite directions in the same course. The warp-knitted fabric of the present invention has proper elongation and stretchability, and has good washing durability; and the fabric after cutting has raveled edges, is not easy to curl in the horizontal direction, has good wearing comfort, and can be widely used to fabricate various garments.

A method for preparing full-dull cotton-like polyester fibers includes: sequentially passing a full-dull polyester POY fiber and a full-dull polyester FDY fiber through a first yarn guide, a yarn guide tube, a second yarn guide, a first yarn feeding roller, pre-entangling, a second yarn feeding roller, a first deformation hot box, a cooling plate, a false twister, a third yarn feeding roller, a middle entangling device, a setting hot box, a setting yarn feeding roller, oiling, and DTY winding and forming to obtain the same. The first and second yarn guides are both yarn guide wheels; a tow is wound around the first yarn feeding roller for 2-3 turns; an inferior angle of the tow before and after contacting a groove bottom of the second yarn guide is 140-160; a linear velocity ratio of the first yarn feeding roller to the second yarn feeding roller is 1.05-1.06.

A device for controlling yarn feeding tension of a false-twist texturing machine, including a support frame, whose two sides are symmetrically and rotatably provided with two support roller groups, respectively. A tensioning roller assembly is slidably arranged at an inner side of the support frame. A lifting frame assembly is slidably arranged on the support frame to drive the tensioning roller assembly to move upward. Two dustproof cover assemblies are symmetrically arranged on two side of a top of the support frame. The tensioning roller assembly includes a tensioning roller, whose outer peripheral surface is provided with annular guide channels evenly spaced apart. Both ends of the tensioning roller are respectively provided with sliders. Two sides of the support frame are respectively provided with rectangular slideways fitting the sliders. The sliders are each provided with an annular protrusion coaxial with the tensioning roller.

A method of manufacturing multi-ply separable textured yarn, the method comprising, passing a multi-ply separable interlaced filament yarn through a texturizing unit to form a multi-ply separable draw textured yarn, wherein the multi-ply separable interlaced filament yarn is separable in to at least two separable interlaced filament yarn, wherein the interlacing 10 of the filaments within each separable interlaced filament yarn is retained during further processing of the yarn to fabric and in the fabric.