Process for manufacturing an anti-see-through regenerative half-fiber

Abstract

This invention discloses a manufacturing process for anti-seepage recycled semi-dull fiber, comprising the following steps: (a) crystallizing and drying recycled semi-dull polyester chips, then blending them with dull masterbatch using a two-component automatic batching machine; the mixture is then fed to a screw extruder for melt extrusion, and the melt is fed to a spinning box, metered by a metering pump, and then pressed into a spinning assembly for spinning to form a nascent filament bundle; the spinning assembly includes a spinneret, the discharge orifice of which has an irregular cross-section; (b) subjecting the nascent filament bundle to post-heating, airless cooling, ring-blowing cooling, and bundling and oiling treatment, followed by pre-networking, stretching and setting, and winding to obtain an anti-seepage recycled semi-dull fiber with an irregular cross-section. This invention can prepare fibers with dulling, anti-seepage, and light-blocking effects and excellent physical and chemical properties, while simultaneously meeting the high requirements for fabric thinness, transparency, and light-blocking properties.

Description

Technical Field

[0001] This invention relates to the field of polyester fiber technology, and more specifically, to a manufacturing process for anti-seepage recycled semi-dull fiber. Background Technology

[0002] With economic development, the concepts of low-carbon, environmentally friendly, and sustainable development have gradually gained popularity. People have higher demands for the functions and properties of textiles, and conventional products can no longer meet market needs. Visual opacity is an important function of textiles, which not only affects their application in daily life but also determines their competitiveness in the market to a certain extent. In recent years, with people's increasing pursuit of personalized textiles and the growing advantages of lightweight textiles in the market, especially in summer clothing, lightweight and comfortable textiles are becoming increasingly popular. However, lightweight textiles often suffer from poor opacity, especially white fabrics made of fine denier fibers. This creates a contradiction between the aesthetics, lightweight nature, and opacity of clothing, which places higher demands on current lightweight textiles—meeting the requirements of lightness while also providing good opacity. Therefore, developing fine denier polyester fibers with anti-see-through and moisture-wicking functions has a promising application prospect. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide a manufacturing process for anti-seepage recycled semi-gloss fiber, which can prepare fibers with matting, anti-seepage, and light-blocking effects and excellent physical and chemical properties, while meeting the high requirements for fabric thinness, transparency, and light-blocking.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A manufacturing process for anti-seepage recycled semi-dull fiber includes the following steps:

[0006] (a) Recycled semi-dull polyester chips are crystallized and dried, and then blended with dull masterbatch through a two-component automatic batching machine. The mixture is then conveyed to a screw extruder for melt extrusion, and the melt is then conveyed to a spinning box. After being metered by a metering pump, it is pressed into the spinning assembly for spinning to form nascent filament bundles. The spinning assembly includes a spinneret, and the discharge hole of the spinneret has an irregular cross-section.

[0007] (b) The nascent fiber bundle is subjected to post-heating, airless cooling, ring blowing cooling, bundle oiling treatment, and then pre-networking, stretching and shaping, and winding to obtain anti-seepage regenerated semi-bright fiber with irregular cross-section.

[0008] Furthermore, the spinneret's outlet hole has a W-shaped cross-section.

[0009] Furthermore, in step (a), the matte masterbatch is a polyester masterbatch with a titanium dioxide content of 2.5%, and the amount of matte masterbatch added is 3-6% of the recycled semi-matte polyester chips.

[0010] Furthermore, in step (a), the crystallization temperature is 155-160℃, the drying temperature is 162-168℃, and the drying air pressure is 0.1-0.12Mpa.

[0011] Furthermore, in step (a), the screw extruder has a diameter of 65 mm and a length-to-diameter ratio of 25. The heating temperatures of zones one to five are 272-280℃ for zone one, 280-285℃ for zone two, 280-285℃ for zone three, 285-290℃ for zone four, and 285-290℃ for zone five, respectively. The extrusion pressure of the screw extruder is 10.5-11.5 MPa, and the post-filtration pressure is 9-9.7 MPa.

[0012] Furthermore, in step (a), the metering pump supply is 20-22 g / min, and the spinning temperature is 290-295℃.

[0013] Furthermore, in step (b), the post-heating temperature is 302-308℃, the height of the windless zone is 46mm, and the air pressure of the annular cooling is 37-42Pa.

[0014] Furthermore, in step (b), the oil concentration is 11%.

[0015] Furthermore, in step (b), the pressure of the pre-network is 0.06-0.08 MPa; the rotation speed of the first drawing roller during drawing and setting is 2500-2700 m / min, and the rotation speed of the second drawing roller is 2600-2800 m / min; the winding speed during winding and forming is 2500-2750 m / min, and the winding tension is 7-9 cN.

[0016] The beneficial effects of this invention are:

[0017] By mixing semi-dull polyester chips with dull masterbatch in a certain proportion, and then melt spinning and optimizing the spinning parameters, fibers with irregular cross sections are obtained. This gives the fibers dullness, anti-seepage, and light-blocking effects, as well as excellent physical and chemical properties. At the same time, it meets consumers' requirements for fabrics that are lightweight, transparent, and light-blocking. Compared with the existing production methods of anti-seepage fibers with core-sheath structure, the process is simpler and the production efficiency is higher. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the cross-section of the spinneret nozzle in this embodiment;

[0019] Figure 2 This is a schematic diagram of the initial state of the improved oiling device in Example 2;

[0020] Figure 3 This is a schematic diagram of the structure of the improved oiling device with the sealing plate deflected to one side in Example 2;

[0021] Figure 4 This is a schematic diagram of the structure of the improved oiling device in Example 2, showing the sealing plate deflected to the other side.

[0022] Reference numerals: Leaf 1, Oil tank 2, Upper chamber 21, Lower chamber 22, Abutting block 23, Oil roller 3, Sealing plate 4, Oil storage tank 5, Limiting block 51, Cylinder 52, Upper guide tube 6, Lower guide tube 7, Filter screen 71, Sealing plug 8, Inclined wall 81, Vacuum cleaner 9. Detailed Implementation

[0023] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0024] The manufacturing process of the anti-seepage recycled semi-light fiber of the present invention includes the following steps:

[0025] (a) Recycled semi-dull polyester chips are crystallized and dried (crystallization temperature: 155-160℃, drying temperature: 162-168℃, drying air pressure: 0.1-0.12 MPa), and then blended with matte masterbatch using a two-component automatic batching machine (matte masterbatch is polyester masterbatch with a titanium dioxide content of 2.5%, and the amount of matte masterbatch added is 3-6% of the recycled semi-dull polyester chips). The mixture is then fed into a screw extruder for melt extrusion (the screw extruder has a diameter of 65 mm and an aspect ratio of 25). The heating temperatures for zones one through five are 272-280℃ for zone one, 280-285℃ for zone two, 280-285℃ for zone three, 285-290℃ for zone four, and 285-290℃ for zone five, respectively. The extrusion pressure of the screw extruder is 10.5-11.5 MPa, and the pressure after filtration is 9-9.7 MPa. The melt is then transported to the spinning box, metered by a metering pump, and then pressed into the spinning assembly for spinning to form nascent filament bundles. The pump supply rate of the metering pump is 20-22 g / min, and the spinning temperature is 290-295℃.

[0026] The spinning assembly includes a spinneret, the discharge orifice of which has an irregular cross-section. Preferably, the discharge orifice cross-section of the spinneret is W-shaped, such as... Figure 1 As shown, the discharge hole cross section of the spinneret includes four blades (1) connected in a W shape, with the included angle between two connected blades (1) being 60°, and each blade (1) having a length l of 0.28 mm and a width m of 0.07 mm.

[0027] (b) The nascent fiber bundle is subjected to post-heating, airless cooling, ring blowing cooling, bundle oiling treatment, and then pre-networking, stretching and shaping, and winding to obtain anti-seepage regenerated semi-bright fiber with irregular cross-section.

[0028] The post-heating temperature is 302-308℃, the height of the windless zone is 46mm, and the air pressure of the ring-blowing cooling is 37-42Pa; the oil concentration ratio is 11%; the pressure of the pre-network is 0.06-0.08Mpa; the rotation speed of the first drawing roller during drawing and setting is 2500-2700m / min, and the rotation speed of the second drawing roller is 2600-2800m / min; the winding speed during winding and forming is 2500-2750m / min, and the winding tension is 7-9cN.

[0029] The method of this invention involves mixing semi-dull polyester chips with dull masterbatch, followed by melt spinning to obtain fibers with irregular cross-sections. This results in fibers possessing dullness, transparency, and light-blocking effects, along with excellent physicochemical properties. This method differs from existing methods for producing sheath-core structure transparent fibers, offering a simpler process. Preferred specific embodiments are as follows:

[0030] Example 1

[0031] (a) Recycled semi-dull polyester chips were crystallized and dried (crystallization temperature: 158°C, drying temperature: 165°C, drying air pressure: 0.1 MPa), and then blended with matte masterbatch using a two-component automatic batching machine (the matte masterbatch is a polyester masterbatch with a titanium dioxide content of 2.5%, and the amount of matte masterbatch added is 3.8% of the recycled semi-dull polyester chips). The mixture was then fed into a screw extruder for melt extrusion (the diameter of the screw extruder is 65 mm). mm, length-to-diameter ratio of 25, heating temperatures of zones one to five are 276℃ for zone one, 282℃ for zone two, 284℃ for zone three, 288℃ for zone four, and 288℃ for zone five, respectively, extrusion pressure of screw extruder is 11 MPa, and pressure after filtration is 9.4 MPa), then the melt is transported to spinning box, metered by metering pump and pressed into spinning assembly for spinning to form nascent filament bundle, pump supply of metering pump is 21.7 g / min, and spinning temperature is 290℃.

[0032] The spinning assembly includes a spinneret, the discharge orifice of which has an irregular cross-section. Preferably, the discharge orifice cross-section of the spinneret is W-shaped, such as... Figure 1 As shown, the discharge hole cross section of the spinneret includes four blades (1) connected in a W shape, with the included angle between two connected blades (1) being 60°, and each blade (1) having a length l of 0.28 mm and a width m of 0.07 mm.

[0033] (b) The nascent fiber bundle is subjected to post-heating, airless cooling, ring blowing cooling, bundle oiling treatment, and then pre-networking, stretching and shaping, and winding to obtain anti-seepage regenerated semi-bright fiber with irregular cross-section.

[0034] The post-heating temperature is 305℃, the height of the windless zone is 46mm, the air pressure of the ring-blowing cooling is 40Pa, the oil concentration ratio is 11%, the pressure of the pre-network is 0.07Mpa, the rotation speed of the first drawing roller during drawing and setting is 2690m / min, the rotation speed of the second drawing roller is 2700m / min, the winding speed during winding and forming is 2674m / min, and the winding tension is 8cN.

[0035] The performance test results of the fiber prepared in Example 1 are shown in Table 1 (the anti-seepage effect was evaluated using a ColorFlex EZ colorimeter).

[0036] Table 1

[0037] project Measured value Linear density 81.28 dtex strength 2.21 cN / dtex Elongation at break 129.7％ thermal stress 48.59cN 60% elongation strength 79.8cN uniformity of strips (cv) 0.7％ oil content 0.5％ Light blocking rate (white fabric) 92.71％ Opacity (white fabric) 99.2％

[0038] Example 2

[0039] Anti-seepage recycled semi-dull fiber was manufactured according to the method of Example 1, but the conventional oil roller oiling device used in Example 1 was replaced with an improved oiling device.

[0040] Traditional oiling rollers involve adding oil to a tank and submerging the lower end of the roller, allowing fibers to pass through. However, during fiber production, the oil is stored statically in the tank, leading to sedimentation or localized solidification. Furthermore, the fibers introduce dust, lint, and other impurities into the oil, resulting in contaminants and affecting oiling quality. While filtration can be achieved by circulating the oil to a filter, the increasing amount of impurities on the filter gradually negatively impacts oiling quality. Additionally, the filter must be cleaned after a period of production, hindering continuous production and maintaining efficiency.

[0041] like Figures 2-4As shown, the oiling device used in this embodiment includes an oiling assembly and two sets of impurity removal assemblies distributed on both sides of the oiling assembly. The oiling assembly includes an oil tank 2, an oil roller 3 rotatably installed inside the oil tank 2, and a sealing plate 4 movable and sealed inside the oil tank 2. The oil roller is located above the sealing plate 4. The sealing plate 4 is configured to alternately deflect in a vertical plane and always divides the inner cavity of the oil tank 2 into an upper chamber 21 and a lower chamber 22 (the sealing plate 4 is preferably made of a rigid plate covered with a layer of sealing material (such as rubber), and the sealing plate 4 can always maintain a seal with the inner wall of the oil tank 2 during the deflection process). Each set of impurity removal assemblies includes an oil storage tank 5, a sealing plug 8 sealed and embedded inside the oil storage tank 5 and movable up and down, and a row of upper guide tubes 6 and a row of lower guide tubes 7 distributed vertically. Each lower guide tube 7 is equipped with a filter screen 71. One end of the upper conduit 6 is connected to the upper part of the oil tank 5, and the other end of the upper conduit 6 is connected to the upper part of the oil tank 2. One end of the lower conduit 7 is connected to the middle part of the oil tank 5, and the other end of the lower conduit 7 is connected to the lower part of the oil tank 2. During the deflection of the sealing plate 4, the upper conduit 6 is always connected to the upper chamber 21. When the sealing plate 4 deflects, the end of the sealing plate 4 can repeatedly pass up and down through the connection port between the lower conduit 7 and the oil tank 2. The end of the sealing plate 4 can deflect downward to a position below the connection port between the lower conduit 7 and the oil tank 2. The sealing plug 8 moves up until the end of the sealing plug 8 near the upper conduit 6 is at the lower end of the connection port between the upper conduit 6 and the oil tank 5 (the sealing plug 8 is made of rubber material, the inner walls of the left and right sides of the oil tank 2 are arc-shaped, and the front and rear sides of the oil tank 2 are straight plates. When the sealing plug 8 moves up and down, it always keeps sealed with the four inner walls of the oil tank 5). A vacuum cleaner 9 is connected to the bottom of the oil tank 2.

[0042] The upper guide tubes 6 are spaced apart along the length of the oil roller 3. One end of the upper guide tube 6 connected to the oil tank 5 is higher than the other end of the upper guide tube 6 connected to the oil tank 2. The sealing plug 8 includes an inclined wall 81 that is inclined downwards and towards the oil tank 2. When the sealing plug 8 moves to its highest point, the inclined wall 81 has the same inclination as the upper guide tube 6 on the same side as the sealing plug 8 that has moved to its highest point. At the same time, the end of the inclined wall 81 near the oil tank 2 is lower than the communication opening between the upper guide tube 6 and the oil tank 5. A limiting block 51 is provided in the upper part of the oil tank 5, and the sealing plug 8 moves upwards to abut against the limiting block 51.

[0043] The lower guide tubes 7 are spaced apart along the length of the oil roller 3. One end of the lower guide tube 7 connected to the oil storage tank 5 is lower than the other end of the lower guide tube 7 connected to the oil tank 2. When one end of the sealing plate 4 is offset to the lowest point, the inclination of the sealing plate 4 and the lower guide tube 7 located on the same side as the end of the sealing plate 4 offset to the lowest point are the same, and at the same time, this end of the sealing plate 4 is lower than the communication port between the lower guide tube 7 and the oil tank 2. There are abutment blocks 23 on both sides of the lower part of the oil tank 2, and the sealing plate 4 is offset downward to abut the abutment blocks 23.

[0044] Initially, the sealing plate 4 is in a horizontal position, one side sealing plug 8 is at the bottom of the oil storage tank 5, and the other side sealing plug 8 is upward abutting against the limiting block 51; oiling agent is added to the upper chamber 21, the oiling agent partially submerges the oil roller 3 and the oiling agent level is lower than the connection port between the upper guide tube 6 and the oil tank 2, such as... Figure 2 As shown. After a period of oiling, the oil contains certain impurities. The motor 24 is started to drive the sealing plate 4 to deflect, so that one end of the sealing plate 4 abuts against the abutment block 23. The upper chamber 21 is connected to the lower guide tube 7 and the oil storage tank 5, which are located on the same side as the lower end of the sealing plate 4. Some of the oil enters the oil storage tank 5 after being filtered by the filter screen 71 in the lower guide tube 7. At this time, the oil in the upper chamber 21 still partially submerges the oil roller 3, such as... Figure 3 As shown; when the oil level in the oil reservoir 5 is about 5cm below the connection between the lower conduit 7 and the oil reservoir 5, the sealing plate 4 is reversed, causing one end of the sealing plate 4 to deflect upwards and the other end to deflect downwards to abut against the abutting block 23. At the same time, one side cylinder 52 drives the sealing plug 8 to move upwards to abut against the limiting block 51, and the other side ( Figure 4 When cylinder 52 (right side) drives the sealing plug 8 to move down to abut the bottom of the oil reservoir 5, the upper chamber 21 becomes connected to the other side of the oil reservoir 5 but not to the original side of the oil reservoir 5. Some of the oil enters the inner cavity of the oil reservoir 5 located above the sealing plug 8 after being filtered by the filter screen 71 in the lower conduit 7. Meanwhile, the oil in the original side of the oil reservoir 5 moves upward under the push of the sealing plug 8 and flows back to the upper chamber 21 through the upper conduit 6. The space below the sealing plug 8 in the original side of the oil reservoir 5 is connected to the lower chamber 22. Figure 4 As shown, before the oil level in the other oil tank 5 reaches approximately 5cm below the connection between the lower conduit 7 and the oil tank 5, the vacuum cleaner 9 is activated to remove impurities from the filter screen 71 in one lower conduit 7. When the oil level in the other oil tank 5 reaches approximately 5cm below the connection between the lower conduit 7 and the oil tank 5, the sealing plate 4 is deflected as described above, using one oil tank 5 for oil filtration and vacuum removal of impurities from the other oil tank. By repeatedly deflecting the sealing plate 4, alternating impurity removal and reflux of the oil and alternating impurity removal by the two sets of filters 71 are achieved, ensuring that impurities are always removed from the oil during continuous fiber production, guaranteeing oiling quality and production efficiency.

[0045] The light-blocking rate of the white fabric produced in Example 2 was 96.58%, and the opacity was 99.9%. After batch production of fibers of the same fineness according to the methods of Examples 1 and 2, it was found that, under the same production volume, the filament breakage rate of the fiber in Example 1 was 0.97%, while the filament breakage rate of the fiber in Example 2 was 0.52% lower than that in Example 1. Simultaneously, 30 samples produced at equal intervals were taken from each sample for performance testing. It was found that the average breaking strength of the fiber samples produced in Example 2 was 0.8 cN / dtex higher than that in Example 1, and the average breaking elongation was 7.03% higher than that in Example 1.

[0046] Comparative Example 1

[0047] Fibers were prepared according to the method of Example 1, but the spinneret cross-section was circular.

[0048] Comparative Example 2

[0049] Fibers were prepared according to the method of Example 2, but the spinneret cross-section was circular.

[0050] Comparative Example 3

[0051] Fibers were prepared according to the method of Example 1, but the spinneret cross section was cross-shaped.

[0052] Comparative Example 4

[0053] Fibers were prepared according to the method of Example 2, but the spinneret cross section was cross-shaped.

[0054] The results showed that the light-blocking rates of the white fiber fabrics in Comparative Examples 1-4 were 80.41%, 80.37%, 87.02%, and 88.11%, respectively, and the opacities were 85.6%, 85.63%, 90.5%, and 90.64%, respectively.

[0055] The above description is merely a preferred embodiment of the present invention. The scope of protection of the present invention is not limited to the above embodiments. All technical solutions falling within the scope of the present invention's concept are within the scope of protection of the present invention. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principles of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. A manufacturing process for anti-seepage recycled semi-dull fiber, characterized in that, Includes the following steps: (a) Recycled semi-dull polyester chips are crystallized and dried, and then blended with dull masterbatch through a two-component automatic batching machine. The mixture is then conveyed to a screw extruder for melt extrusion, and the melt is then conveyed to a spinning box. After being metered by a metering pump, it is pressed into the spinning assembly for spinning to form nascent filament bundles. The spinning assembly includes a spinneret, and the discharge hole of the spinneret has an irregular cross-section. (b) The nascent fiber bundle is subjected to post-heating, airless cooling, ring blowing cooling, bundled oiling treatment, and then pre-networking, stretching and shaping, and winding to obtain anti-seepage recycled semi-bright fiber with irregular cross-section. The oiling device includes an oiling assembly and two sets of impurity removal assemblies distributed on both sides of the oiling assembly. The oiling assembly includes an oil tank, an oil roller rotatably mounted inside the oil tank, and a sealing plate movable and sealed within the oil tank. The oil roller is located above the sealing plate. The sealing plate is designed to alternately deflect in a vertical plane and always divides the oil tank cavity into an upper chamber and a lower chamber. Each set of impurity removal assemblies includes an oil storage tank, a sealing plug sealed within the oil storage tank and movable vertically, and a row of upper guide tubes and a row of lower guide tubes distributed vertically. Each lower guide tube is equipped with a filter. The upper conduit is connected to the upper part of the oil tank at one end and to the upper part of the oil tank at the other end. The lower conduit is connected to the middle part of the oil tank at one end and to the lower part of the oil tank at the other end. During the deflection of the sealing plate, the upper conduit is always connected to the upper chamber. When the sealing plate deflects, the end of the sealing plate can repeatedly pass up and down through the connection port between the lower conduit and the oil tank. The end of the sealing plate can deflect downward to a position below the connection port between the lower conduit and the oil tank. The sealing plug moves upward to a position where the end of the sealing plug near the upper conduit is at the lower end of the connection port between the upper conduit and the oil tank. A vacuum cleaner is connected to the bottom of the oil tank.

2. The manufacturing process of the anti-seepage recycled semi-light fiber according to claim 1, characterized in that, The spinneret's outlet hole has a W-shaped cross-section.

3. The manufacturing process of the anti-seepage recycled semi-light fiber according to claim 1, characterized in that, In step (a), the matte masterbatch is a polyester masterbatch with a titanium dioxide content of 2.5%, and the amount of matte masterbatch added is 3-6% of the recycled semi-matte polyester chips.

4. The manufacturing process of the anti-seepage recycled semi-dimmed fiber according to claim 1, characterized in that, In step (a), the crystallization temperature is 155-160℃, the drying temperature is 162-168℃, and the drying air pressure is 0.1-0.12MPa.

5. The manufacturing process of the anti-seepage recycled semi-light fiber according to claim 1, characterized in that, In step (a), the screw extruder has a diameter of 65 mm and a length-to-diameter ratio of 25. The heating temperatures of zones one to five are 272-280℃ for zone one, 280-285℃ for zone two, 280-285℃ for zone three, 285-290℃ for zone four, and 285-290℃ for zone five, respectively. The extrusion pressure of the screw extruder is 10.5-11.5 MPa, and the pressure after filtration is 9-9.7 MPa.

6. The manufacturing process of the anti-seepage recycled semi-light fiber according to claim 1, characterized in that, In step (a), the metering pump supply is 20-22 g / min, and the spinning temperature is 290-295℃.

7. The manufacturing process of the anti-seepage recycled semi-light fiber according to claim 1, characterized in that, In step (b), the post-heating temperature is 302-308℃, the height of the windless zone is 46mm, and the air pressure of the ring-blowing cooling is 37-42Pa.

8. The manufacturing process of the anti-seepage recycled semi-light fiber according to claim 1, characterized in that, In step (b), the oil concentration ratio is 11%.

9. The manufacturing process of the anti-seepage recycled semi-light fiber according to claim 1, characterized in that, In step (b), the pressure of the pre-network is 0.06-0.08 MPa; the rotation speed of the first drawing roller during drawing and setting is 2500-2700 m / min, and the rotation speed of the second drawing roller is 2600-2800 m / min; the winding speed during winding and forming is 2500-2750 m / min, and the winding tension is 7-9 cN.

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