A production process of regenerated semi-dull antibacterial flame-retardant polyester DTY fiber

Abstract

The invention discloses a production process of a regenerated semi-dull antibacterial flame-retardant polyester DTY fiber, wherein the regenerated semi-dull antibacterial flame-retardant polyester POY yarn is sequentially passed through a raw yarn rack, a first roller, a deformation hot box, a cooling plate, a false twister, a second roller, a network nozzle, an auxiliary roller, a shaping hot box, and a third feeding roller, and then oiled by an oiling system, and finally wound to form the regenerated semi-dull antibacterial flame-retardant polyester DTY fiber. The product quality stability of the invention is high, meets the requirements of environmentally friendly production, and meets the differentiated market demand for regenerated fibers.

Description

Technical Field

[0001] The invention relates to the technical field of polymer fibers, in particular to a production process of regenerated semi-dull antibacterial flame-retardant polyester DTY fibers. Background Art

[0002] Currently, most of the antibacterial and flame-retardant polyester fibers on the market are virgin fibers, and the production process consumes petroleum resources. After the virgin fibers are used and discarded, a large amount of waste polyester will be generated, which cannot be effectively treated, causing environmental pollution and energy loss. Therefore, it is necessary to develop recycled antibacterial and flame-retardant polyester fibers to improve the environmental pollution problem caused by waste polyester.

[0003] The cooling plate is an important equipment component required in the production of fiber texturing. The function of the cooling plate is to dissipate the internal heat to the surrounding environment by using the large surface area of ​​the cooling plate to dissipate the heat of the wire after the wire is plasticized at high temperature in the hot box, thereby fixing the thermal deformation of the wire and reducing its thermoplasticity. The commonly used V-groove cooling plate allows air to flow to dissipate the heat of spinning, but the heat dissipation effect is not high, and the cooling time is long, which cannot meet the current processing requirements and will also affect the quality of the final product. Summary of the invention

[0004] The purpose of the present invention is to overcome the deficiencies of the above-mentioned prior art and provide a production process for regenerated semi-matt antibacterial flame-retardant polyester DTY fiber, which has high product quality stability, meets environmental protection production requirements, and meets the market's differentiated demand for regenerated fibers.

[0005] In order to achieve the above object, the present invention adopts the following technical solution:

[0006] A production process for regenerated semi-dull antibacterial flame-retardant polyester DTY fiber, wherein the regenerated semi-dull antibacterial flame-retardant polyester POY yarn is sequentially passed through a raw yarn rack, a first roller, a deformation hot box, a cooling plate, a false twister, a second roller, a network nozzle, an auxiliary roller, a shaping hot box, and a third feeding roller, and then oiled by an oiling system, and finally wound to form the regenerated semi-dull antibacterial flame-retardant polyester DTY fiber.

[0007] The cooling plate includes a base plate and side plates hinged on both sides of the base plate. The upper surface of the base plate is recessed to form a through groove arranged along the length direction of the base plate. A row of balls that roll and abut against each other are embedded in the through groove, and the ball part is higher than the upper surface of the base plate.

[0008] The through groove includes a first groove with a square longitudinal section, a second groove with an oval longitudinal section, and a third groove with a square longitudinal section, which are connected up and down. The inner wall of the first groove is connected to the inner wall of the second groove by an arc wall A, and the inner wall of the second groove is connected to the inner wall of the third groove by an arc wall B. The outer wall of the ball is in contact with the arc wall A and the arc wall B, and the inner wall of the second groove is spaced apart from the ball.

[0009] The bottom plate and the side plates are both provided with air holes.

[0010] The temperature of the deformation hot box is 185℃~200℃.

[0011] The temperature of the hot box is 175°C.

[0012] The stretching ratio is 1.72 to 1.76.

[0013] The processing speed is 700m / min~800m / min.

[0014] The D / Y ratio is 1.65.

[0015] The beneficial effects of the present invention are as follows: by optimizing and improving the texturing process, a regenerated semi-matt antibacterial and flame-retardant polyester DTY fiber with excellent performance is prepared, which meets the requirements of environmentally friendly production and satisfies the differentiated needs of the market for regenerated fibers; by improving the cooling plate, a row of balls abutting the filament bundles is combined with the dual effects of air flow to dissipate heat, and there is rolling friction between the filament bundles and the balls, and the friction is very small, thereby avoiding the influence of excessive friction on the fiber quality, and the product quality stability is significantly improved, so that the fiber meets the use standards. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A top view of the cooling plate bottom plate of the present invention;

[0017] Figure 2 It is a structural diagram of the cooling plate bottom plate of the present invention;

[0018] Figure 3 is a structural diagram of a cooling plate of the present invention;

[0019] Figure 4 for Figure 3 Enlarged view of point A in the middle.

[0020] In the figure: bottom plate 1, through groove 11, first groove 111, second groove 112, third groove 113, arc wall A 114, arc wall B 115, side plate 2, ball 3, air hole 4. DETAILED DESCRIPTION

[0021] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments:

[0022] Example 1

[0023] A production process for regenerated semi-dull antibacterial flame-retardant polyester DTY fiber, wherein the regenerated semi-dull antibacterial flame-retardant polyester POY yarn is sequentially passed through a raw yarn rack, a first roller, a deformation hot box, a cooling plate, a false twister, a second roller, a network nozzle, an auxiliary roller, a shaping hot box, and a third feeding roller, and then oiled by an oiling system, and finally wound to form the regenerated semi-dull antibacterial flame-retardant polyester DTY fiber. Among them, the temperature of the deformation hot box is 185°C; the temperature of the shaping hot box is 175°C; the stretching multiple is 1.74; the processing speed is 750m / min; and the D / Y ratio is 1.65.

[0024] The recycled semi-dull antibacterial flame-retardant polyester POY is made from recycled semi-dull antibacterial flame-retardant polyester chips, which are dried, melt-extruded by a screw extruder, and the melt-sliced ​​chips are passed through a metering pump of a spinning machine, and then subjected to spinning, oiling, winding, and balancing processes.

[0025] Embodiment 2-5

[0026] Regenerated semi-dull antibacterial flame-retardant polyester DTY fiber was prepared according to the method of Example 1, except that the temperatures of the deformation hot box were 180° C., 190° C., 195° C., and 200° C., respectively.

[0027] The fiber products of Examples 1-5 were subjected to performance tests, and the results are shown in Table 1.

[0028] Table 1: Comparison of polyester DTY properties at different deformation oven temperatures

[0029]

[0030] Examples 6-10

[0031] Regenerated semi-dull antibacterial flame-retardant polyester DTY fiber was prepared according to the method of Example 1, except that the stretching multiples were 1.70, 1.72, 1.76, 1.78 and 1.80, respectively.

[0032] The fiber products of Examples 1 and 6-10 were tested for performance, and the results are shown in Table 2.

[0033] Table 2 Comparison of strength, elongation and appearance under different stretching ratios (DR)

[0034]

[0035] With the increase of the stretching ratio, the tensile stress of POY increases, the crystallinity remains basically unchanged, but the orientation of the amorphous region increases significantly, the false twist stability is improved, the false twist effect is improved, the defects such as tight spots and stiff fibers are reduced, and the uniformity of dyeing is improved. From the perspective of dyeing uniformity, the stretching ratio can be appropriately increased. However, with the increase of the stretching ratio, the monofilament is easy to break and form hairy fibers. At the same time, the orientation degree increases, which increases the molecular force and weakens its curling effect. Considering these two factors, the appropriate stretching ratio is selected in production to control the fiber elongation at (19.0±3)%. After experimental demonstration, it is more appropriate to select a stretching ratio of 1.75.

[0036] Examples 11-13

[0037] Regenerated semi-dull antibacterial flame-retardant polyester DTY fiber was prepared according to the method of Example 1, except that the processing speeds were 700 m / min, 800 m / min, and 850 m / min, respectively.

[0038] The fiber products of Examples 1 and 11-13 were subjected to performance tests, and the results are shown in Table 3.

[0039] Table 3 Comparison of different processing speeds

[0040]

[0041] The processing speed of DTY is mainly affected by the intrinsic quality of POY and the mechanical properties of the texturing machine itself. POY has high orientation and crystallinity, and the production process is more stable. Therefore, compared with conventional POY, the processing speed of recycled products is low. After selecting the deformation temperature and stretching multiple, the maximum processing speed of 167dtex / 96f recycled semi-bright antibacterial flame retardant DTY is 950m / min. Above this speed, the yarn will shake at the outlet of the hot box, the cooling plate and the false twister, and the heating and false twisting stretching process will be unstable. The fiber will become stiff, the tension will fluctuate severely, and the tension difference shown by the online tension meter will be obvious. At the same time, as the production speed increases, the yarn will receive less heat and its elastic effect will decrease. In addition, since the spindle positions for the test are limited, in order to ensure that all processing spindle positions can obtain a stable processing process, through experimental comparison, the processing speed is selected as 750m / min in production.

[0042] Examples 14-16

[0043] Regenerated semi-dull antibacterial flame-retardant polyester DTY fiber was prepared according to the method of Example 1, except that the processing speeds were 700 m / min, 800 m / min, and 850 m / min, respectively.

[0044] The fiber products of Examples 1 and 14-16 were subjected to performance tests, and the results are shown in Table 4.

[0045] Table 4 Comparison of different D / Y ratios

[0046]

[0047]

[0048] The fibers of Examples 1-16 were tested for their antibacterial and flame retardant properties. The average inhibition rates against Staphylococcus aureus, Escherichia coli, and Candida albicans were 91.5%, 87.3%, and 89.4%, respectively. The limiting oxygen index was 37.2%.

[0049] Examples 17-24

[0050] Fibers were prepared according to the methods of Examples 1, 3-5, 7-8, and 11-12, respectively, except that an improved cooling plate was used.

[0051] like Figure 1-3 As shown, the cooling plate includes a base plate 1 and side plates 2 hinged on both sides of the base plate 1. The side plates 2 are hinged to the base plate 1 by hinges, and the angle range of the two side plates 2 can be changed, thereby improving the cooling effect; the upper surface of the base plate 1 is recessed to form a through groove 11 arranged along the length direction of the base plate 1, and the through groove 11 penetrates up and down but not in the length direction. A row of balls 3 rolling and abutting against each other are embedded in the through groove 11, and the balls 3 are partially higher than the upper surface of the base plate 1.

[0052] The through groove 11 includes a first groove 111 with a square longitudinal section, a second groove 112 with an oval longitudinal section, and a third groove 113 with a square longitudinal section, which are connected from top to bottom. The inner wall of the first groove 111 is connected to the inner wall of the second groove 112 through an A arc wall 114, and the inner wall of the second groove 112 is connected to the inner wall of the third groove 113 through a B arc wall 115. The outer wall of the ball 3 abuts against the A arc wall 114 and the B arc wall 115, and the inner wall of the second groove 112 is spaced from the ball 3. Through the above structural design, the ball 3 and the inner wall of the through groove 11 are in rolling contact, and air holes are formed between the ball 3 and the through groove 11 and between adjacent balls 3, so the arrangement of a row of balls 3 will not affect heat dissipation. The bottom plate 1 and the side plate 2 are both provided with air holes 4.

[0053] When the filament bundle passes through the cooling plate, the filament bundle abuts against a row of balls 3 up and down, and there is rolling friction between the filament bundle and the balls 3, and the air holes between the balls 3 and the through grooves 11 can still be ventilated, thereby achieving heat conduction between the filament bundle and the balls 3 and heat transfer between the filament bundle and the air, thereby enhancing the cooling effect and being beneficial to improving product quality.

[0054] Batch production was carried out according to Examples 1, 3-5, 7-8, 11-12 and Examples 17-24, and it was found that after using the improved cooling plate, the fiber breakage rate was reduced by 5.12%, the lint rate was reduced by 8.94%, the product quality stability was improved, the antibacterial rate against Staphylococcus aureus was increased by an average of 2.65%, the antibacterial rate against Escherichia coli was increased by an average of 1.21%, the antibacterial rate against Candida albicans was increased by an average of 0.93%, and the limiting oxygen index was increased by an average of 3.12%.

[0055] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A production process for regenerated semi-dull antibacterial flame-retardant polyester DTY fiber, characterized by: The regenerated semi-dull antibacterial flame-retardant polyester POY yarn is sequentially passed through a raw yarn rack, a first roller, a deformation hot box, a cooling plate, a false twister, a second roller, a network nozzle, an auxiliary roller, a shaping hot box, and a third feeding roller, and then oiled by an oiling system, and finally wound to form a regenerated semi-dull antibacterial flame-retardant polyester DTY fiber; The cooling plate comprises a bottom plate (1) and side plates (2) hinged on both sides of the bottom plate (1); the upper surface of the bottom plate (1) is recessed to form a through groove (11) arranged along the length direction of the bottom plate (1); a row of balls (3) rolling and abutting against each other are embedded in the through groove (11); and a portion of the balls (3) is higher than the upper surface of the bottom plate (1); The through groove (11) comprises a first groove (111) with a square longitudinal section, a second groove (112) with an oval longitudinal section, and a third groove (113) with a square longitudinal section, which are connected to each other from top to bottom. The inner wall of the first groove (111) is connected to the inner wall of the second groove (112) via an A arc wall (114), and the inner wall of the second groove (112) is connected to the inner wall of the third groove (113) via a B arc wall (115). The outer wall of the ball (3) abuts against the A arc wall (114) and the B arc wall (115), and the inner wall of the second groove (112) is spaced from the ball (3).

2. A production process for regenerated semi-dull antibacterial flame-retardant polyester DTY fiber as claimed in claim 1, characterized in that: The bottom plate (1) and the side plate (2) are both provided with air holes (4).

3. The production process of the regenerated semi-dull antibacterial flame-retardant polyester DTY fiber as claimed in claim 1, characterized in that: The temperature of the deformation hot box is 185℃~200℃.

4. The production process of the regenerated semi-matt antibacterial flame-retardant polyester DTY fiber as claimed in claim 1, characterized in that: The temperature of the hot box is 175°C.

5. The production process of the regenerated semi-dull antibacterial flame-retardant polyester DTY fiber as claimed in claim 1, characterized in that: The stretching ratio is 1.72 to 1.

76.

6. The production process of the regenerated semi-dull antibacterial flame-retardant polyester DTY fiber as claimed in claim 1, characterized in that: The processing speed is 700 m / min~800 m / min.

7. The production process of the regenerated semi-dull antibacterial flame-retardant polyester DTY fiber as claimed in claim 1, characterized in that: The D / Y ratio is 1.65.

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