CN113529188A

CN113529188A - High-brightness bright processing yarn and preparation method thereof

Info

Publication number: CN113529188A
Application number: CN202010310639.5A
Authority: CN
Inventors: 陈蒙; 葛晓锋; 顾云霞; 薛红忠
Original assignee: Toray Fibers Nantong Co Ltd
Current assignee: Toray Fibers Nantong Co Ltd
Priority date: 2020-04-20
Filing date: 2020-04-20
Publication date: 2021-10-22

Abstract

The invention discloses a high-brightness bright processing yarn and a preparation method thereof. The cross section of the processing yarn is triangular, the brightness L value is above 90, the cross section is not deformed in the processing process, and the obtained product has stronger luster. The method is suitable for various fields such as automobile interior decoration, and has the advantages of low processing cost, high yield and very wide market prospect.

Description

High-brightness bright processing yarn and preparation method thereof

Technical Field

The invention relates to a high-brightness bright processing yarn with a triangular cross section and a preparation method thereof.

Background

With the improvement of living standard, the requirements of people on the aspects of texture, vividness, glossiness and the like of the clothing fabric are gradually improved. The fabric made of the bright polyester fiber with the triangular cross section is bright in color and excellent in light reflection performance, so that the market demand is increased day by day.

Chinese patent CN201620212U discloses a PBT fiber with a special-shaped cross section, wherein the cross section is triangular or Y-shaped, and the cross section is formed by spinning through triangular or Y-shaped spinneret orifices. However, because of the expansion of the polymer at the spinneret orifice, the cross section of the fiber made of the triangular spinneret orifice cannot be regular triangle, but three sides are nearly circular with convex arc; the cross-section of the fibers made from the Y-shaped spinneret orifices may not be a straight Y-shape, but a Y-shape with three sides being concave arcs. The gloss of the fibers with the approximately circular and concave-circular Y-shaped cross sections is greatly reduced compared with the gloss of the fibers with the regular triangular cross sections.

Disclosure of Invention

The invention aims to provide a large-triangular-section bright processing yarn with a non-deformed section and a stronger luster feeling of an obtained product in a processing process.

The invention is realized by the following technical scheme:

the high-brightness bright textured yarn has a triangular cross section, and the brightness L value is more than 90, preferably 92-95.

The filament fineness of the processed filament is preferably 3-10 dtex.

The invention also discloses two preparation methods of the high-brightness bright processing yarn, wherein the first method comprises the following steps: and (3) melting and extruding the dried big bright slices, introducing the big bright slices into a spinning box, metering the big bright slices by a metering pump, sending the big bright slices into a special-shaped spinneret plate to be sprayed out, and cooling and oiling the big bright slices to obtain the preprocessed yarns. The spinneret orifices of the special-shaped spinneret plate are Y-shaped spinneret orifices, and the joints of three strip-shaped notches of the Y-shaped spinneret orifices are convex arcs.

The second method is as follows: melting and extruding the dried big bright slices, introducing the big bright slices into a spinning box, metering the big bright slices by a metering pump, sending the big bright slices into a special-shaped spinneret plate for spraying, and cooling and oiling to prepare pre-oriented yarns; and sequentially passing the prepared pre-oriented yarn through a first roller, a first hot box for heating, a cooling plate, a false twister, a second roller, an interlacer, a second hot box for shaping and a third roller to obtain the processed yarn. The spinneret orifices of the special-shaped spinneret plate are Y-shaped spinneret orifices, and the joints of three strip-shaped notches of the Y-shaped spinneret orifices are convex arcs.

The diameter of the convex arc is 0.15-0.25 mm.

The winding speed of the pre-oriented yarn is preferably 3500-3900 m/min, more preferably 3600-3800 m/min; the extension ratio between the first roller and the second roller is preferably 1.20-1.45, and more preferably 1.33-1.37; the temperature of the first hot box is preferably 80-110 ℃, and more preferably 90-100 ℃.

According to the invention, through the special spinneret orifice design, the section of the obtained processing filament is triangular, and the triangular section can not deform in the processing or subsequent weaving process, so that a product with higher gloss is obtained, and the processing method is suitable for various fields such as automobile interior trim, low in processing cost, high in yield and very wide in market prospect.

Drawings

FIG. 1 is a schematic cross-sectional view of a bright polyester process yarn of the present invention.

FIG. 2 is a cross-sectional view of a pre-oriented process filament.

FIG. 3 is a cross-sectional view of a false twist textured yarn.

FIG. 4 is a cross-sectional view of a false twist textured yarn prepared from a conventional Y-shaped spinneret orifice.

FIG. 5 is a cross-sectional view of a false twist textured yarn produced from a triangular spinneret orifice.

Detailed Description

The cross section of the high-brightness bright processing filament is triangular, and more specifically, the cross section of the high-brightness bright processing filament is triangular with three sides being substantially straight lines. The substantially straight line may be a standard straight line, or a straight line having a slight degree of concavity and convexity in the vicinity of the standard straight line, or a concave arc line or a convex arc line having a small radian. The closer the triangle side is to a straight line, the higher the L value of the processed yarn and the better the gloss.

As described above, the higher the value of the lightness L, the higher the gloss of the processed yarn, but the higher the value of the lightness L, the higher the requirements of the processed yarn on the processing conditions, and the stability of the quality of the processed yarn cannot be maintained. In order to obtain a glossy appearance as much as possible while ensuring stable quality of the processed yarn, the L value of the processed yarn of the present invention is 90 or more, preferably 92 to 95.

The filament number of the processed yarn is preferably 3-10 dtex. If the fineness of the single filament is too small, the brightness L value of the processed filament is small, and the requirement on the luster feeling cannot be met; if the fineness of the single yarn is too large, the production stability of the processed yarn is poor and the workability is poor.

The polymer raw material forming the high brightness bright finishing yarn of the present invention may be polyethylene terephthalate (PET), polypropylene terephthalate (PPT), polybutylene terephthalate (PBT) or the like, with PET being preferred.

The processed yarn of the present invention may be a pre-oriented yarn (POY) or a false twisted yarn (DTY). The invention also discloses a preparation method of the POY and the DTY.

The preparation method of the POY comprises the following steps: and (3) melting and extruding the dried big bright slices, introducing the big bright slices into a spinning box, metering the big bright slices by a metering pump, sending the big bright slices into a special-shaped spinneret plate to be sprayed out, and cooling and oiling the big bright slices to obtain the preprocessed yarns.

The preparation method of DTY comprises the following steps: melting and extruding the dried big bright slices, introducing the big bright slices into a spinning box, metering the big bright slices by a metering pump, sending the big bright slices into a special-shaped spinneret plate for spraying, and cooling and oiling to prepare pre-oriented yarns; and sequentially passing the prepared pre-oriented yarn through a first roller, a first hot box for heating, a cooling plate, a false twister, a second roller, an interlacer, a second hot box for shaping and a third roller to obtain the processed yarn.

In the two methods, the spinneret orifices of the special-shaped spinneret plate are Y-shaped spinneret orifices, and the joints of three strip-shaped notches of the Y-shaped spinneret orifices are convex arcs.

The diameter of the convex arc can influence the shape of the section of the processed wire, and if the diameter of the convex arc is too small, the edge of the triangular section of the processed wire is seriously concave, and the luster is poor; if the diameter of the convex arc is too large, the edge of the triangular cross section of the obtained processed yarn is seriously convex, and the gloss is poor. Therefore, in order to obtain a standard triangle with three substantially straight sides, the diameter of the convex arc at the connection position of the three long-strip-shaped notches of the Y-shaped spinneret orifice is preferably 0.15-0.25 mm.

If the coiling speed is too low, the processing tension in the subsequent processing process is low, and stable processing cannot be realized; if the speed is too high, the pre-oriented filaments are not produced stably. Therefore, the winding speed of the pre-oriented yarn of the processed yarn is preferably 3500-3900 m/min, and more preferably 3600-3800 m/min.

The extension ratio between the first roller and the second roller is preferably 1.20-1.45. If the draw ratio is too low, stable production is not possible during false twisting, and the physical properties of the processed yarn are affected; if the magnification is too high, the triangular cross section is changed during false twisting, which affects the luster of the processed yarn. The stretch ratio between the first roller and the second roller is more preferably 1.33 to 1.37.

The first heat box is not particularly limited, and may be a contact heat box or a non-contact heat box. When the contact type hot box is used, the set temperature is lower; when the non-contact type hot box is used, the set temperature is higher. However, if the temperature of the first hot box is too low, the false twisting cannot be stably performed, and the physical properties of the processed yarn are affected; if the temperature of the first hot box is too high, the triangular cross section is changed during the false twisting, which affects the luster of the processed yarn. The temperature of the first hot box is preferably 80-110 ℃, and more preferably 90-100 ℃.

According to the preparation method disclosed by the invention, the triangular section processing yarn with the substantially straight edge is obtained by controlling the profile spinneret plate and combining the process conditions in the preferred technical scheme. When the processed yarn is pre-oriented yarn, the cross section is not deformed when processed by a false twisting machine, the cross section of the obtained false twisted yarn keeps a triangle with three sides being substantially straight lines, the luster feeling is excellent, and the false twisted yarn is suitable for various fields such as automobile interior decoration.

The test method designed by the invention comprises the following steps:

(1) value of L

The sample was superposed in a light-tight state, and then subjected to color measurement with a spectrophotometer (Datacolor 650 manufactured by Datacolor asia pacific (H.K.) ltd.), to automatically obtain an L value.

(2) Fineness of single filament

Testing according to the national standard GB/T14343-2003B method.

(3) Spinnability (POY yarn breakage rate)

The spinnability refers to the number of broken yarn loops occurring in spinning every 12hr in the spinning process, and the smaller the number of broken yarn loops, the better the spinnability; the larger the number of broken filaments, the poorer the spinnability. Judging the yarn is excellent if no yarn is broken in 12hr, and marking as O; breaking 1 time in 12hr, judging as good, marking delta; breaking the filament for more than 2 times in 12hr, judging as poor, marking x.

(4) Processability (DTY broken yarn rate)

The processability refers to the number of broken yarn loops generated in the processing every 12hr in the processing process, and the smaller the number of broken yarn loops is, the better the processability is; the larger the number of broken filaments, the poorer the processability. Judging the yarn is excellent if no yarn is broken in 12hr, and marking as O; breaking 1 time in 12hr, judging as good, marking delta; breaking the filament for more than 2 times in 12hr, judging as poor, marking x.

Example 1:

melt-extruding the dried big bright slices, introducing the big bright slices into a spinning manifold, metering the big bright slices by a metering pump, sending the big bright slices into a Y-shaped spinneret plate with the diameter of an outer convex circle of 0.20mm for spraying, cooling and oiling the big bright slices, and preparing the polyester undrawn yarn with 220 dtex and 36 monofilaments and a triangular section through the reeling speed of 3700 m/min; the produced undrawn yarn is sequentially heated by a first roller, a first hot box, a cooling plate, a false twister, a second roller and the first hot box, the contact hot box is used, the temperature is 80 ℃, the drawing is carried out between the 1 st roller and the 2 nd roller, the drawing multiplying power is 1.33, and then the high-brightness bright textured yarn with the fineness of 167 dtex, the single-yarn fineness of 4.6 dtex/root and the brightness L value of 95.1 is obtained by a cross-winding device, the second hot box (140 ℃) and a third roller. Specific values are shown in table 1.

Example 2:

melt-extruding the dried big bright slices, introducing the big bright slices into a spinning manifold, metering the big bright slices by a metering pump, sending the big bright slices into a Y-shaped spinneret plate with the diameter of an outer convex circle of 0.20mm for spraying, cooling and oiling the big bright slices, and preparing the polyester undrawn yarn with 220 dtex and 36 monofilaments and a triangular section through the reeling speed of 3700 m/min; the produced undrawn yarn is sequentially heated by a first roller, a first hot box, a cooling plate, a false twister, a second roller and the first hot box, the contact hot box is used, the temperature is 95 ℃, the drawing is carried out between the 1 st roller and the 2 nd roller, the drawing multiplying power is 1.33, and then the high-brightness bright textured yarn with the fineness of 167 dtex, the fineness of 4.6 dtex/root and the brightness L value of 94.0 is obtained by a cross-winding device, the second hot box (140 ℃) and a third roller. Specific values are shown in table 1.

Example 3:

melt-extruding the dried big bright slices, introducing the big bright slices into a spinning manifold, metering the big bright slices by a metering pump, sending the big bright slices into a Y-shaped spinneret plate with the diameter of an outer convex circle of 0.20mm for spraying, cooling and oiling the big bright slices, and preparing the polyester undrawn yarn with 220 dtex and 36 monofilaments and a triangular section through the reeling speed of 3700 m/min; the produced undrawn yarn is sequentially heated by a first roller, a first hot box, a cooling plate, a false twister, a second roller and the first hot box, the contact hot box is used, the temperature is 110 ℃, the drawing is carried out between the 1 st roller and the 2 nd roller, the drawing multiplying power is 1.33, and then the high-brightness bright textured yarn with the fineness of 167 dtex, the fineness of 4.6 dtex/root and the brightness L value of 91.4 is obtained by a cross-winding device, the second hot box (140 ℃) and a third roller. Specific values are shown in table 1.

Example 4:

melt-extruding the dried big bright slices, introducing the big bright slices into a spinning box, metering the big bright slices by a metering pump, sending the big bright slices into a Y-shaped spinneret plate with the diameter of an outer convex circle of 0.20mm for spraying, cooling and oiling the big bright slices, and preparing the polyester undrawn yarn with 198 dtex and 36 monofilaments with triangular sections through the reeling speed of 3700 m/min; the produced undrawn yarn is sequentially heated by a first roller, a first hot box, a cooling plate, a false twister, a second roller and the first hot box, the contact hot box is used, the temperature is 95 ℃, the drawing is carried out between the 1 st roller and the 2 nd roller, the drawing multiplying power is 1.20, and then the high-brightness bright textured yarn with the fineness of 167 dtex, the single-yarn fineness of 4.6 dtex/root and the brightness L value of 94.8 is obtained by a cross-winding device, the second hot box (140 ℃) and a third roller. Specific values are shown in table 1.

Example 5:

melt-extruding the dried big bright slices, introducing the big bright slices into a spinning manifold, metering the big bright slices by a metering pump, sending the big bright slices into a Y-shaped spinneret plate with the diameter of an outer convex circle of 0.20mm for spraying, cooling and oiling the big bright slices, and preparing the polyester undrawn yarn with 223 dtex and 36 monofilaments with the number cross section of a triangular cross section at the reeling speed of 3700 m/min; the produced undrawn yarn is sequentially heated by a first roller, a first hot box, a cooling plate, a false twister, a second roller and the first hot box, the contact hot box is used, the temperature is 95 ℃, the drawing is carried out between the 1 st roller and the 2 nd roller, the drawing multiplying power is 1.35, and then the high-brightness bright textured yarn with the fineness of 167 dtex, the single-yarn fineness of 4.6 dtex per root and the brightness L value of 93.9 is obtained by a cross-winding device, the second hot box (140 ℃) and a third roller. Specific values are shown in table 1.

Example 6:

melt-extruding the dried big bright slices, introducing the big bright slices into a spinning manifold, metering the big bright slices by a metering pump, sending the big bright slices into a Y-shaped spinneret plate with the diameter of an outer convex circle of 0.20mm for spraying, cooling and oiling the big bright slices, and preparing the polyester undrawn yarn with the number of 36 monofilaments and the triangular section through the reeling speed of 3700 m/min; the produced undrawn yarn is sequentially heated by a first roller, a first hot box, a cooling plate, a false twister, a second roller and the first hot box, the contact hot box is used, the temperature is 95 ℃, the drawing is carried out between the 1 st roller and the 2 nd roller, the drawing multiplying power is 1.45, and then the high-brightness bright textured yarn with the fineness of 167 dtex, the single-yarn fineness of 4.6 dtex/root and the brightness L value of 91.3 is obtained by a cross-winding device, the second hot box (140 ℃) and a third roller. Specific values are shown in table 1.

Example 7:

melt-extruding the dried big bright slices, introducing the big bright slices into a spinning box, metering the big bright slices by a metering pump, sending the big bright slices into a Y-shaped spinneret plate with the diameter of an outer convex circle of 0.20mm for spraying, cooling and oiling the big bright slices, and preparing the polyester undrawn yarn with 223 dtex and 36 monofilaments with the triangular cross section through the winding speed of 3500 m/min; the produced undrawn yarn is sequentially heated by a first roller, a first hot box, a cooling plate, a false twister, a second roller and the first hot box, the contact hot box is used, the temperature is 95 ℃, the drawing is carried out between the 1 st roller and the 2 nd roller, the drawing multiplying power is 1.35, and then the high-brightness bright textured yarn with the fineness of 167 dtex, the single-yarn fineness of 4.6 dtex per root and the brightness L value of 93.9 is obtained by a cross-winding device, the second hot box (140 ℃) and a third roller. Specific values are shown in table 1.

Example 8:

melt-extruding the dried big bright slices, introducing the big bright slices into a spinning box, metering the big bright slices by a metering pump, sending the big bright slices into a Y-shaped spinneret plate with the diameter of an outer convex circle of 0.20mm for spraying, cooling and oiling the big bright slices, and preparing the polyester undrawn yarn with 223 dtex and 36 monofilaments with the triangular cross section through the winding speed of 3900 m/min; the produced undrawn yarn is sequentially heated by a first roller, a first hot box, a cooling plate, a false twister, a second roller and the first hot box, the contact hot box is used, the temperature is 95 ℃, the drawing is carried out between the 1 st roller and the 2 nd roller, the drawing multiplying power is 1.35, and then the high-brightness bright textured yarn with the fineness of 167 dtex, the single-yarn fineness of 4.6 dtex/root and the brightness L value of 94.0 is obtained by a cross-winding device, the second hot box (140 ℃) and a third roller. Specific values are shown in table 1.

Example 9:

melt-extruding the dried big bright slices, introducing the big bright slices into a spinning manifold, metering the big bright slices by a metering pump, sending the big bright slices into a Y-shaped spinneret plate with the diameter of an outer convex circle of 0.20mm for spraying, cooling and oiling the big bright slices, and preparing the polyester undrawn yarn with 150 dtex and 36 monofilaments with the number cross sections of triangular cross sections at the reeling speed of 3700 m/min; the produced undrawn yarn is sequentially heated by a first roller, a first hot box, a cooling plate, a false twister, a second roller and a contact hot box used by the first hot box, is stretched between the 1 st roller and the 2 nd roller at the temperature of 95 ℃, the stretching multiplying power is 1.35, and then the undrawn yarn is shaped by an interlacer, the second hot box (140 ℃) and a third roller to obtain the high-brightness big-gloss processing false-twisted yarn with the fineness of 110 dtex, the monofilament fineness of 3.1 dtex/root and the brightness L value of 91.8. Specific values are shown in table 1.

Example 10:

melt-extruding the dried big bright slices, introducing the big bright slices into a spinning manifold, metering the big bright slices by a metering pump, sending the big bright slices into a Y-shaped spinneret plate with the diameter of an outer convex circle of 0.20mm for spraying, cooling and oiling the big bright slices, and preparing the polyester undrawn yarn with 470 dtex and 36 monofilaments with the number cross sections of triangular cross sections at a reeling speed of 3700 m/min; the produced undrawn yarn is sequentially heated by a first roller, a first hot box, a cooling plate, a false twister, a second roller and a contact hot box used by the first hot box, is stretched between the 1 st roller and the 2 nd roller at the temperature of 95 ℃, the stretching multiplying power is 1.35, and then the undrawn yarn is shaped by an interlacer, the second hot box (140 ℃) and a third roller to obtain the high-brightness big bright textured yarn with the fineness of 345 dtex, the single-yarn fineness of 9.6 dtex/root and the brightness L value of 94.8. Specific values are shown in table 1.

Example 11:

melt-extruding the dried big bright slices, introducing the big bright slices into a spinning manifold, metering the big bright slices by a metering pump, sending the big bright slices into a Y-shaped spinneret plate with the diameter of an outer convex circle of 0.15mm for spraying, cooling and oiling the big bright slices, and preparing the polyester undrawn yarn with 220 dtex and 36 monofilaments with the number cross sections of triangular cross sections at a reeling speed of 3800 m/min; the produced undrawn yarn is sequentially heated by a first roller, a first hot box, a cooling plate, a false twister, a second roller and the first hot box, the contact hot box is used, the temperature is 90 ℃, the drawing is carried out between the 1 st roller and the 2 nd roller, the drawing multiplying power is 1.33, and then the high-brightness bright textured yarn with the fineness of 167 dtex, the single-yarn fineness of 4.6 dtex per root and the brightness L value of 90.1 is obtained by a cross-winding device, the second hot box (140 ℃) and a third roller. Specific values are shown in Table 2.

Example 12:

melt-extruding the dried big bright slices, introducing the big bright slices into a spinning manifold, metering the big bright slices by a metering pump, sending the big bright slices into a Y-shaped spinneret plate with the diameter of an outer convex circle of 0.25mm for spraying, cooling and oiling the big bright slices, and preparing the polyester undrawn yarn with 220 dtex and 36 monofilaments and triangular cross sections at a coiling speed of 3800 m/min; the produced undrawn yarn is sequentially heated by a first roller, a first hot box, a cooling plate, a false twister, a second roller and the first hot box, the contact hot box is used, the temperature is 90 ℃, the drawing is carried out between the 1 st roller and the 2 nd roller, the drawing multiplying power is 1.33, and then the high-brightness bright textured yarn with the fineness of 167 dtex, the monofilament fineness of 4.6 dtex per root and the brightness L value of 90.0 is obtained by a crosser, the second hot box (140 ℃) and a third roller. Specific values are shown in Table 2.

Example 13:

melt-extruding the dried big bright slices, introducing the slices into a spinning box, metering the slices by a metering pump, sending the slices into a Y-shaped spinneret plate with the diameter of an outer convex circle of 0.20mm for spraying, cooling and oiling the slices, and preparing the polyester undrawn yarn with 223 dtex and 36 monofilaments with the number cross section of a triangular cross section at a coiling speed of 3400 m/min; the produced undrawn yarn is sequentially heated by a first roller, a first hot box, a cooling plate, a false twister, a second roller and the first hot box, the contact hot box is used, the temperature is 95 ℃, the drawing is carried out between the 1 st roller and the 2 nd roller, the drawing multiplying power is 1.35, and then the high-brightness bright textured yarn with the fineness of 167 dtex, the single-yarn fineness of 4.6 dtex per root and the brightness L value of 93.0 is obtained by a cross-winding device, the second hot box (140 ℃) and a third roller. Specific values are shown in Table 2.

Example 14:

melt-extruding the dried big bright slices, introducing the big bright slices into a spinning box, metering the big bright slices by a metering pump, sending the big bright slices into a Y-shaped spinneret plate with the diameter of an outer convex circle of 0.20mm for spraying, cooling and oiling the big bright slices, and preparing the polyester undrawn yarn with 223 dtex and 36 monofilaments with the triangular cross section through the coiling speed of 4000 m/min; the produced undrawn yarn is sequentially heated by a first roller, a first hot box, a cooling plate, a false twister, a second roller and the first hot box, the contact hot box is used, the temperature is 95 ℃, the drawing is carried out between the 1 st roller and the 2 nd roller, the drawing multiplying power is 1.35, and then the high-brightness bright textured yarn with the fineness of 167 dtex, the single-yarn fineness of 4.6 dtex/root and the brightness L value of 94.0 is obtained by a cross-winding device, the second hot box (140 ℃) and a third roller. Specific values are shown in Table 2.

Example 15:

melt-extruding the dried big bright slices, introducing the big bright slices into a spinning manifold, metering the big bright slices by a metering pump, sending the big bright slices into a Y-shaped spinneret plate with the diameter of an outer convex circle of 0.20mm for spraying, cooling and oiling the big bright slices, and preparing the polyester undrawn yarn with 220 dtex and 36 monofilaments and a triangular section through the reeling speed of 3700 m/min; the produced undrawn yarn is sequentially heated by a first roller, a first hot box, a cooling plate, a false twister, a second roller and the first hot box, the contact hot box is used, the temperature is 75 ℃, the drawing is carried out between the 1 st roller and the 2 nd roller, the drawing multiplying power is 1.33, and then the high-brightness bright textured yarn with the fineness of 167 dtex, the single-yarn fineness of 4.6 dtex/root and the brightness L value of 95.5 is obtained by a cross-winding device, the second hot box (140 ℃) and a third roller. Specific values are shown in Table 2.

Example 16:

melt-extruding the dried big bright slices, introducing the big bright slices into a spinning manifold, metering the big bright slices by a metering pump, sending the big bright slices into a Y-shaped spinneret plate with the diameter of an outer convex circle of 0.20mm for spraying, cooling and oiling the big bright slices, and preparing the polyester undrawn yarn with 220 dtex and 36 monofilaments and a triangular section through the reeling speed of 3700 m/min; the produced undrawn yarn is sequentially heated by a first roller, a first hot box, a cooling plate, a false twister, a second roller and a contact hot box used by the first hot box, is stretched between the 1 st roller and the 2 nd roller at the temperature of 115 ℃, the stretching multiplying power is 1.33, and then the undrawn yarn is shaped by an interlacer, the second hot box (140 ℃) and a third roller to obtain the high-brightness big-gloss processing false-twisted yarn with the fineness of 167 dtex, the fineness of 4.6 dtex per root and the brightness L value of 90.6. Specific values are shown in Table 2.

Example 17:

melt-extruding the dried big bright slices, introducing the big bright slices into a spinning manifold, metering the big bright slices by a metering pump, sending the big bright slices into a Y-shaped spinneret plate with the diameter of an outer convex circle of 0.20mm for spraying, cooling and oiling the big bright slices, and preparing polyester undrawn yarn with 190 dtex and 36 monofilaments with triangular cross sections at a reeling speed of 3700 m/min; the produced undrawn yarn is sequentially heated by a first roller, a first hot box, a cooling plate, a false twister, a second roller and the first hot box, the contact hot box is used, the temperature is 95 ℃, the drawing is carried out between the 1 st roller and the 2 nd roller, the drawing multiplying power is 1.15, and then the high-brightness bright textured yarn with the fineness of 167 dtex, the monofilament fineness of 4.6 dtex per root and the brightness L value of 95.2 is obtained by a crosser, the second hot box (140 ℃) and a third roller. Specific values are shown in Table 2.

Example 18:

melt-extruding the dried big bright slices, introducing the big bright slices into a spinning manifold, metering the big bright slices by a metering pump, sending the big bright slices into a Y-shaped spinneret plate with the diameter of an outer convex circle of 0.20mm for spraying, cooling and oiling the big bright slices, and preparing the polyester undrawn yarn with 248 dtex and 36 monofilaments with triangular sections through the reeling speed of 3700 m/min; the produced undrawn yarn is sequentially heated by a first roller, a first hot box, a cooling plate, a false twister, a second roller and the first hot box, the contact hot box is used, the temperature is 95 ℃, the drawing is carried out between the 1 st roller and the 2 nd roller, the drawing multiplying power is 1.50, and then the high-brightness bright textured yarn with the fineness of 167 dtex, the monofilament fineness of 4.6 dtex per root and the brightness L value of 90.1 is obtained by a crosser, the second hot box (140 ℃) and a third roller. Specific values are shown in Table 2.

Example 19:

and (2) melting and extruding the dried bright chips, introducing the bright chips into a spinning manifold, metering the bright chips by a metering pump, sending the bright chips into a Y-shaped spinneret plate with the diameter of an outer convex circle of 0.20mm for spraying, cooling and oiling the bright chips, and preparing the polyester undrawn yarn with the number of 36 monofilaments and the triangular section through the reeling speed of 3700m/min, wherein the brightness L value is 92.8. Specific values are shown in Table 2.

Comparative example 1:

a polyester undrawn yarn with 220 dtex and 36 single-yarn number sections as concave triangular sections is prepared by using a common Y-shaped spinneret at a winding speed of 3800m/min, and is stretched between a 1 st roller and a 2 nd roller, wherein the stretching ratio is 1.33, a contact hot box is used as the 1 st hot box, the temperature is 90 ℃, and a false-twisted yarn processing yarn with the fineness of 167 dtex, the single-yarn fineness of 4.6 dtex/yarn and the brightness L value of 87.0 is obtained (the cross section is shown in figure 4), and the spinnability is excellent. Specific values are shown in Table 2.

Comparative example 2:

a polyester undrawn yarn of 220 dtex having a 36-filament number section of a convex triangular section was obtained by using a triangular spinneret at a take-up speed of 3800m/min, and was drawn between a 1 st roller and a 2 nd roller at a draw ratio of 1.33 using a contact heat box at a temperature of 90 ℃ to obtain a false-twisted yarn-processed yarn of 167 dtex, a filament fineness of 4.6 dtex/root and a lightness L value of 85.0 (see FIG. 5 for cross-section), which was excellent in spinnability. Specific values are shown in Table 2.

Claims

1. High luminance has bright processing silk greatly, its characterized in that: the cross section of the processing filament is triangular, and the brightness L value is more than 90.

2. The high brightness bright textured yarn of claim 1, wherein: the brightness L value of the processing yarn is 92-95.

3. The high brightness bright textured yarn of claim 1, wherein: the filament number of the processing filament is 3-10 dtex.

4. The method for preparing high brightness bright lustrous processed yarn as claimed in claim 1, wherein the dried bright lustrous slices are melt extruded, introduced into a spinning box, metered by a metering pump, sent into a profile spinneret to be sprayed out, cooled and oiled to prepare the preprocessed yarn; the method is characterized in that: the spinneret orifices of the special-shaped spinneret plate are Y-shaped spinneret orifices, and the joints of three strip-shaped notches of the Y-shaped spinneret orifices are convex arcs.

5. The method for preparing high brightness bright lustrous processed yarn as claimed in claim 1, wherein the dried bright lustrous slices are melt extruded, introduced into a spinning box, metered by a metering pump, sent into a profile spinneret to be sprayed, cooled and oiled to prepare pre-oriented yarn; sequentially passing the prepared pre-oriented yarn through a first roller, a first hot box for heating, a cooling plate, a false twister, a second roller, an interlacer, a second hot box for shaping and a third roller to obtain a processed yarn; the method is characterized in that: the spinneret orifices of the special-shaped spinneret plate are Y-shaped spinneret orifices, and the joints of three strip-shaped notches of the Y-shaped spinneret orifices are convex arcs.

6. The method for preparing high-brightness bright textured yarn according to claim 4 or 5, wherein the method comprises the following steps: the diameter of the convex arc is 0.15-0.25 mm.

7. The method for preparing high-brightness bright textured yarn according to claim 4 or 5, wherein the method comprises the following steps: the winding speed of the pre-oriented yarn is 3500-3900 m/min.

8. The method for preparing high brightness bright textured yarn according to claim 6, wherein the method comprises the following steps: the winding speed of the pre-oriented yarn is 3600-3800 m/min.

9. The method for preparing high brightness bright textured yarn according to claim 5, wherein the method comprises the following steps: the extension ratio between the first roller and the second roller is 1.20-1.45; the temperature of the first hot box is 80-110 ℃.

10. The method for preparing high-brightness bright textured yarn according to claim 5 or 8, wherein the method comprises the following steps: the extension magnification between the first roller and the second roller is 1.33-1.37; the temperature of the first hot box is 90-100 ℃.