Method for preparing full-dull cotton-like polyester fibers

Abstract

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.

Claims

1. A method for preparing a full-dull cotton-like polyester fiber, comprising: sequentially passing a full-dull polyester pre-oriented yarn (POY) fiber and a full-dull polyester fully drawn yarn (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, and oiling to obtain the full-dull cotton-like polyester fiber, wherein each of the first yarn guide and the second yarn guide is a yarn guide wheel; wherein a tow contacts a groove bottom of the first yarn guide and a groove bottom of the second yarn guide in a process of a movement, driving the first yarn guide and the second yarn guide to rotate; wherein the tow is wound around the first yarn feeding roller for 2-3 turns; wherein an inferior angle of the tow before and after contacting the groove bottom of the second yarn guide is 140-160; and wherein a linear velocity ratio of the first yarn feeding roller to the second yarn feeding roller is 1.05-1.06.

2. The method of claim 1, wherein a shape and a size of the first yarn guide are identical to a shape and a size of the second yarn guide.

3. The method of claim 2, wherein a rim width of the yarn guide wheel is 20-25 mm, an outer diameter of an outer wheel is 9.4-10.7 mm, and an inner diameter of the groove bottom of the first yarn guide or the second yarn guide is 6-7.4 mm.

4. The method of claim 1, wherein a material of the yarn guide wheel is ceramic, a surface hardness of the groove bottom of the first yarn guide or the second yarn guide is 1500-2000 HV, and a friction coefficient between the groove bottom of the first yarn guide or the second yarn guide and the tow is 0.2-0.22.

5. The method of claim 1, wherein a tension value of the tow during pre-entangling is 2.5-3.5 cN.

6. The method of claim 1, wherein specifications of the full-dull polyester POY fiber and the full-dull polyester FDY fiber are both 192 dtex/108f.

7. The method of claim 1, wherein the full-dull polyester POY fiber and the full-dull polyester FDY fiber both contain a matting agent, a content of the matting agent is 2.2-2.5 wt %, and the matting agent is titanium dioxide.

8. The method of claim 1, wherein main process parameters are: a pre-entangling jet air pressure of 3.2-3.5 bar, a pre-entangling jet aperture of 1.5-1.7 mm, a first deformation hot box temperature of 180-195 C., a setting hot box temperature of 150-160 C., a linear velocity ratio of the third yarn feeding roller to the second yarn feeding roller of 1.1-1.14, a winding speed of 500-600 m/min, a setting overfeeding rate of 4.0-5.0%, and a winding overfeeding rate of 2.0-3.0%.

9. The method of claim 1, wherein the full-dull cotton-like polyester fiber has a breaking strength of 2.1-2.3 cN/dtex, an interlacing degree of 100-105/m, and a CV value of breaking strength 6.00%.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) FIG. 1 is a flow chart of the preparation process of the invention;

(2) FIG. 2 is a schematic diagram of the positional relationship between the tow and the second yarn guide in the process of movement;

(3) FIG. 3 is a schematic diagram of sectional structure of the yarn guide wheel of the invention;

(4) wherein the numbers in the figures are respectively represented: 1the full-dull polyester POY fiber and the full-dull polyester FDY fiber, 2first yarn guide, 3yarn guide tube, 4second yarn guide, 5first yarn feeding roller, 6pre-entangling, 7second yarn feeding roller, 8first deformation hot box, 9cooling plate, 10false twister, 11third yarn feeding roller, 12middle entangling device, 13setting hot box, 14setting yarn feeding roller, and 15oiling.

DETAILED DESCRIPTION OF THE EMBODIMENTS

(5) Based on above mentioned method, the following embodiments are carried out for further demonstration in the present invention. It is to be understood that these embodiments are only intended to illustrate the invention and are not intended to limit the scope of the invention. In addition, it should be understood that after reading the contents described in the present invention, those technical personnel in this field can make various changes or modifications to the invention, and these equivalent forms also fall within the scope of the claims attached to the application.

(6) In the examples of the invention, the breaking strength, the interlacing degree and the CV value of breaking strength of the full-dull cotton-like polyester fiber prepared on the first day refer to the average value of the performances of the full-dull cotton-like polyester fiber obtained on the first full day of production; the breaking strength, the interlacing degree and the CV value of breaking strength of the full-dull cotton-like polyester fiber prepared after 60 days of continuous production refer to the average value of the performances of the full-dull cotton-like polyester fiber obtained on the 60th full day of production.

(7) The process of preparing the full-dull cotton-like polyester fiber by using DTY texturing process is as follows: as shown in FIG. 1, the full-dull polyester POY fiber and the full-dull polyester FDY fiber 1 containing the matting agent of titanium dioxide are sequentially passed through a first yarn guide 2, a yarn guide tube 3, a second yarn guide 4, a first yarn feeding roller 5, pre-entangling 6, a second yarn feeding roller 7, a first deformation hot box 8, a cooling plate 9, a false twister 10, a third yarn feeding roller 11, a middle entangling device 12, a setting hot box 13, a setting yarn feeding roller 14, oiling 15, and DTY winding and forming to obtain the full-dull cotton-like polyester fiber.

Example 1

(8) A method for preparing full-dull cotton-like polyester fibers, using the said DTY texturing process, wherein specifications of the full-dull polyester POY fiber and the full-dull polyester FDY fiber are both 192 dtex/108f, and contents of the matting agent titanium dioxide in the full-dull polyester POY fiber and the full-dull polyester FDY fiber are both 2.2 wt %; wherein the first yarn guide and the second yarn guide are both yarn guide wheels, and are the same in shape and size, the material of the yarn guide wheel is ceramic, the surface hardness of the groove bottom is 1500 HV, and the friction coefficient between the groove bottom and the tow is 0.20; as shown in FIG. 3, wherein the rim width of the yarn guide wheel is 20 mm, the outer diameter of the outer wheel is 9.4 mm, and the inner diameter of the groove bottom is 6 mm; wherein the tow contacts groove bottoms of the first yarn guide and the second yarn guide in the process of movement, driving the first yarn guide and the second yarn guide to rotate; wherein the tow is wound around the first yarn feeding roller for 2 turns; as shown in FIG. 2, wherein the inferior angle of the tow before and after contacting the groove bottom of the second yarn guide is 140; wherein process parameters are: a pre-entangling jet air pressure of 3.2 bar, a pre-entangling jet aperture of 1.5 mm, a first deformation hot box temperature of 180 C., a setting hot box temperature of 150 C., a linear velocity ratio of the first yarn feeding roller to the second yarn feeding roller is 1.05, a linear velocity ratio of the third yarn feeding roller to the second yarn feeding roller of 1.1, a winding speed of 500 m/min, a setting overfeeding rate of 4%, and a winding overfeeding rate of 2%.

(9) Adopting the above process for continuous production, the tension of the tow during pre-entangling is 2.7 cN; wherein the full-dull cotton-like polyester fiber prepared on the first day has a breaking strength of 2.3 cN/dtex, an interlacing degree of 105/m, and a CV value of breaking strength of 5.45%; wherein the full-dull cotton-like polyester fiber prepared after 60 days of continuous production has a breaking strength of 2.2 cN/dtex, an interlacing degree of 101/m, and a CV value of breaking strength of 5.85%.

Comparison 1

(10) A method for preparing full-dull cotton-like polyester fibers, basically the same as Example 1, except for that: the first yarn guide and the second yarn guide are both yarn guide rollers that cannot be rolled. The full-dull cotton-like polyester fiber prepared on the first day has a breaking strength of 2.3 cN/dtex, an interlacing degree of 95/m, and a CV value of breaking strength of 5.8%; the full-dull cotton-like polyester fiber prepared after 10 days of continuous production has a breaking strength of 1.9 cN/dtex, an interlacing degree of 68/m, and a CV value of breaking strength of 8.3%. After 60 days, it can no longer be produced. Comparing Example 1 with Comparison 1, it can be seen that the breaking strength, the interlacing degree, and the CV value of breaking strength of the full-dull cotton-like polyester fiber have changed significantly, because the wear of the first yarn guide and the second yarn guide has a greater impact on the quality of fibers.

Example 2

(11) A method for preparing full-dull cotton-like polyester fibers, using the said DTY texturing process, wherein specifications of the full-dull polyester POY fiber and the full-dull polyester FDY fiber are both 192 dtex/108f, and contents of the matting agent titanium dioxide in the full-dull polyester POY fiber and the full-dull polyester FDY fiber are both 2.3 wt %; wherein the first yarn guide and the second yarn guide are both yarn guide wheels, and are the same in shape and size, the material of the yarn guide wheel is ceramic, the surface hardness of the groove bottom is 1800 HV, and the friction coefficient between the groove bottom and the tow is 0.20; wherein the rim width of the yarn guide wheel is 20 mm, the outer diameter of the outer wheel is 9.4 mm, and the inner diameter of the groove bottom is 6.2 mm; wherein the tow contacts groove bottoms of the first yarn guide and the second yarn guide in the process of movement, driving the first yarn guide and the second yarn guide to rotate; wherein the tow is wound around the first yarn feeding roller for 2 turns; wherein the inferior angle of the tow before and after contacting the groove bottom of the second yarn guide is 145; wherein process parameters are: a pre-entangling jet air pressure of 3.2 bar, a pre-entangling jet aperture of 1.5 mm, a first deformation hot box temperature of 185 C., a setting hot box temperature of 155 C., a linear velocity ratio of the first yarn feeding roller to the second yarn feeding roller is 1.06, a linear velocity ratio of the third yarn feeding roller to the second yarn feeding roller of 1.12, a winding speed of 520 m/min, a setting overfeeding rate of 4.2%, and a winding overfeeding rate of 2.2%.

(12) Adopting the above process for continuous production, the tension of the tow during pre-entangling is 2.5 cN; wherein the full-dull cotton-like polyester fiber prepared on the first day has a breaking strength of 2.2 cN/dtex, an interlacing degree of 103/m, and a CV value of breaking strength of 5.24%; wherein the full-dull cotton-like polyester fiber prepared after 60 days of continuous production has a breaking strength of 2.1 cN/dtex, an interlacing degree of 100/m, and a CV value of breaking strength of 5.58%.

Example 3

(13) A method for preparing full-dull cotton-like polyester fibers, using the said DTY texturing process, wherein specifications of the full-dull polyester POY fiber and the full-dull polyester FDY fiber are both 192 dtex/108f, and contents of the matting agent titanium dioxide in the full-dull polyester POY fiber and the full-dull polyester FDY fiber are both 2.4 wt %; wherein the first yarn guide and the second yarn guide are both yarn guide wheels, and are the same in shape and size, the material of the yarn guide wheel is ceramic, the surface hardness of the groove bottom is 1880 HV, and the friction coefficient between the groove bottom and the tow is 0.22; wherein the rim width of the yarn guide wheel is 23 mm, the outer diameter of the outer wheel is 10.2 mm, and the inner diameter of the groove bottom is 7 mm; wherein the tow contacts groove bottoms of the first yarn guide and the second yarn guide in the process of movement, driving the first yarn guide and the second yarn guide to rotate; wherein the tow is wound around the first yarn feeding roller for 3 turns; wherein the inferior angle of the tow before and after contacting the groove bottom of the second yarn guide is 150; wherein process parameters are: a pre-entangling jet air pressure of 3.5 bar, a pre-entangling jet aperture of 1.6 mm, a first deformation hot box temperature of 192 C., a setting hot box temperature of 157 C., a linear velocity ratio of the first yarn feeding roller to the second yarn feeding roller is 1.06, a linear velocity ratio of the third yarn feeding roller to the second yarn feeding roller of 1.14, a winding speed of 550 m/min, a setting overfeeding rate of 4.8%, and a winding overfeeding rate of 2.5%.

(14) Adopting the above process for continuous production, the tension of the tow during pre-entangling is 3.5 cN; wherein the full-dull cotton-like polyester fiber prepared on the first day has a breaking strength of 2.2 cN/dtex, an interlacing degree of 104/m, and a CV value of breaking strength of 5.33%; wherein the full-dull cotton-like polyester fiber prepared after 60 days of continuous production has a breaking strength of 2.1 cN/dtex, an interlacing degree of 101/m, and a CV value of breaking strength of 5.78%.

Example 4

(15) A method for preparing full-dull cotton-like polyester fibers, using the said DTY texturing process, wherein specifications of the full-dull polyester POY fiber and the full-dull polyester FDY fiber are both 192 dtex/108f, and contents of the matting agent titanium dioxide in the full-dull polyester POY fiber and the full-dull polyester FDY fiber are both 2.5 wt %; wherein the first yarn guide and the second yarn guide are both yarn guide wheels, and are the same in shape and size, the material of the yarn guide wheel is ceramic, the surface hardness of the groove bottom is 2000 HV, and the friction coefficient between the groove bottom and the tow is 0.22; wherein the rim width of the yarn guide wheel is 25 mm, the outer diameter of the outer wheel is 10.7 mm, and the inner diameter of the groove bottom is 7.4 mm; wherein the tow contacts groove bottoms of the first yarn guide and the second yarn guide in the process of movement, driving the first yarn guide and the second yarn guide to rotate; wherein the tow is wound around the first yarn feeding roller for 4 turns; wherein the inferior angle of the tow before and after contacting the groove bottom of the second yarn guide is 160; wherein process parameters are: a pre-entangling jet air pressure of 3.5 bar, a pre-entangling jet aperture of 1.7 mm, a first deformation hot box temperature of 195 C., a setting hot box temperature of 160 C., a linear velocity ratio of the first yarn feeding roller to the second yarn feeding roller is 1.05, a linear velocity ratio of the third yarn feeding roller to the second yarn feeding roller of 1.12, a winding speed of 600 m/min, a setting overfeeding rate of 5%, and a winding overfeeding rate of 3%.

(16) Adopting the above process for continuous production, the tension of the tow during pre-entangling is 2.8 cN; wherein the full-dull cotton-like polyester fiber prepared on the first day has a breaking strength of 2.3 cN/dtex, an interlacing degree of 100/m, and a CV value of breaking strength of 5.14%; wherein the full-dull cotton-like polyester fiber prepared after 60 days of continuous production has a breaking strength of 2.1 cN/dtex, an interlacing degree of 97/m, and a CV value of breaking strength of 5.42%.