Bundling and drafting device for geotextile spinning and geotextile production line

Abstract

The utility model discloses a bundling and drafting device for geotextile spinning and a geotextile production line, the bundling and drafting device comprises a bundling and drafting box, and a first drafting roller unit, a second drafting roller unit and a third drafting roller unit which are arranged in the bundling and drafting box, and the drafting speeds of the three drafting roller units are sequentially increased; each drawing roller unit comprises a plurality of drawing rollers which are parallel to one another, and the three drawing roller units sequentially draw a fiber bundle which is formed by a plurality of fibers and enters the bundling drawing box; therefore, the fiber bundles are mechanically bundled and drafted through the three drafting roller units with the drafting speeds sequentially increased, the fiber drafting process in the spinning process is optimized, in addition, the geotechnical cloth production line provided with the bundling and drafting device can adapt to polyester raw materials with higher viscosity, the tensile strength of the prepared polyester geotechnical cloth is improved, and the production efficiency is improved. And the drafting speed of the polypropylene fibers can be increased, so that the tensile strength of the prepared polypropylene geotextile is improved.

Description

Technical Field

[0001] The present application relates to the technical field of geotextile production, and in particular to a geotextile spinning bundling and stretching device capable of improving the strength of the geotextile, and a geotextile production line including the device. Background Art

[0002] Geotextiles are a building material that provides stratification, water filtration, stabilization, and reinforcement. They are widely used in engineering projects such as road construction, water conservancy facilities, and environmental protection. Currently, polyester (PET) and polypropylene (PP) geotextiles are widely used in engineering applications. The tensile strength of geotextiles is one of the key factors affecting their performance. Therefore, improving the tensile strength of geotextiles has always been an important research direction in geotextile production technology.

[0003] In order to effectively improve the tensile strength of geotextiles, common technical means include selecting high-viscosity raw material slices, increasing the spinning and drawing speed, and improving the needling effect. For example, Chinese invention patent CN117328210A discloses a high-strength polyester geotextile and production process. This patent scheme is to improve the fiber strength of polyester geotextile by improving the raw materials and related content ratios of the production of polyester geotextile. For another example, Chinese invention patent CN113668080A discloses a spinning and drawing device and a polypropylene filament geotextile production line. This patent improves the transmission speed of the combined stretching rollers in the spinning and drawing device. The transmission speed of the combined stretching rollers increases from top to bottom, so that the spinning can be gradually stretched in a plastic state, that is, the strength of the geotextile is improved by increasing the spinning and drawing speed.

[0004] Currently, the spinning process for polyester (PET) geotextiles primarily utilizes air drafting technology, a process that utilizes air flow to stretch fibers. The air drafting process involves feeding fibers into an airflow zone. Airflow velocity and pressure are adjusted to stretch the fibers. The airflow velocity and direction determine the degree of fiber stretching and changes in fiber morphology. In the airflow, the fibers are subjected to the force of the airflow, stretching them, increasing their length and reducing their diameter. This rearranges the fiber's molecular structure, thereby improving their strength and flexibility. Currently, polyester chips with an intrinsic viscosity of 0.64 are primarily used as raw materials for polyester (PET) geotextiles. This is because, in practice, chips with this viscosity have been shown to be highly compatible with the air drafting process during spinning and can effectively control fiber quality during the spinning process. However, when polyester chips with higher viscosities are selected, the increased viscosity limits air drafting during spinning, making fiber stretching difficult and thus affecting the final fiber's strength and quality. Therefore, currently, improving the strength of polyester (PET) geotextiles is limited by the choice of raw material chip viscosity.

[0005] The spinning process of polypropylene (PP) geotextile is mainly completed by the single-spindle independent drawing process. In the single-spindle independent drawing method, the drawing equipment is assigned to each bundle of fine fibers with a separate drawing unit. These drawing units are generally composed of traction rollers, which stretch the fibers by applying tension. The single spindle refers to the "spindle" or "roller" of each drawing unit, which is used to pull and stretch the fibers. In the single-spindle independent drawing process, each "spindle" operates independently and only draws one bundle of fine fibers. Polypropylene (PP) geotextile uses polypropylene as its raw material. Its fluidity in the molten state is poor. During the drawing process, the fibers will face greater tensile resistance and are prone to breakage. Especially when the drawing speed is too fast, the melt is unevenly stretched, resulting in insufficient fiber strength and broken fibers. Therefore, the current strength improvement of polypropylene (PP) geotextile is limited in terms of spinning drawing speed.

[0006] Therefore, the production methods of traditional polyester geotextiles and polypropylene geotextiles are relatively mature, but the above factors restrict the further improvement of the tensile strength of polyester (PET) geotextiles and polypropylene (PP) geotextiles. It is necessary to propose a new technical solution to solve the problems existing in the existing technology. Utility Model Content

[0007] The present application provides a geotextile spinning bundling and stretching device and a geotextile production line, which are used to solve the problem that the tensile strength of existing geotextiles is difficult to further improve.

[0008] In order to achieve the above objectives, this application provides the following technical solutions:

[0009] On the one hand, the present application provides a bunching and stretching device for geotextile spinning, comprising a bunching and stretching box, wherein a fiber bundle inlet and a fiber bundle outlet are provided on the bunching and stretching box, and a fiber bundle composed of a plurality of fiber filaments enters the bunching and stretching box from the fiber bundle inlet; a first stretching roller unit, a second stretching roller unit and a third stretching roller unit are provided in the bunching and stretching box, and each stretching roller unit comprises a plurality of stretching rollers parallel to each other, a stretching speed of the first stretching roller unit is less than a stretching speed of the second stretching roller unit, and a stretching speed of the second stretching roller unit is less than a stretching speed of the third stretching roller unit, the first stretching roller unit, the second stretching roller unit and the third stretching roller unit sequentially stretch the fiber bundle entering the bunching and stretching box, and the stretched fiber bundle is output from the fiber bundle outlet; a hot air inlet and an air outlet for balancing the air pressure are provided on the bunching and stretching box.

[0010] Furthermore, in the above technical solution, the first drafting roller unit includes two drafting rollers that are parallel to each other and staggered up and down, one of which is connected to the output end of the first motor as a driving roller, and the two drafting rollers are connected through a first synchronous belt transmission.

[0011] Furthermore, the second drafting roller unit includes two drafting rollers that are parallel to each other and staggered up and down, one of which is connected to the output end of the second motor as a driving roller, and the two drafting rollers are connected through a second synchronous belt transmission.

[0012] Furthermore, the third drafting roller unit includes two drafting rollers that are parallel to each other and staggered up and down, one of which is connected to the output end of the third motor as a driving roller, and the two drafting rollers are connected through a third synchronous belt transmission.

[0013] Furthermore, the first drafting roller unit, the second drafting roller unit and the third drafting roller unit are arranged in sequence, and the fiber bundle entering the bundle drafting box is wound around each drafting roller in sequence along an S-shaped route.

[0014] On the other hand, the present application provides a geotextile production line, comprising the above-mentioned geotextile spinning bundling and drawing device, and also comprising a silo, a melt extruder, a melt filter, a spinning box, a cooling device, a wire separation device, a wire guide device, a wire feeder, a wire swing machine, a needle punching machine, a waste edge cutting machine and a winding machine, wherein:

[0015] The silo is used to store raw materials, and the silo has a feed port and a discharge port, the discharge port is connected to the inlet end of the melt extruder, the melt extruder is used to heat and extrude the raw materials fed therein, and the molten raw materials are discharged from the outlet end of the melt extruder to the melt filter, and the melt filter is used to filter the molten raw materials; one or more spinning devices are arranged in the spinning box, each spinning device includes a metering pump and a spinneret arranged at the outlet end of the metering pump, the inlet end of the metering pump is connected to the raw material outlet end of the melt filter, and the spinneret is provided with a plurality of spinnerets; the outlet end of each spinning device is provided with a cooling device, and the cooling device is used to cool the melt stream ejected from the spinneret into fiber filaments, and a plurality of the fiber filaments are gathered together The fibers are bundled and enter the geotextile spinning bundling and stretching device, the outlet end of the geotextile spinning bundling and stretching device is connected to the wire dividing device, the wire dividing device is used to divide the bundled and stretched fibers into several bundles, each bundle including several fiber filaments; the wire guide device includes a plurality of wire guide wheels, each wire guide wheel is used to introduce each bundle of fiber filaments into the corresponding spindle position, and each spindle position is provided with a wire feeder, the wire feeder is used to feed each bundle of fiber filaments into the swing wire machine, the swing wire machine is used to swing the fiber filaments fed into it and lay a net, the fiber net obtained by laying the net by the swing wire machine is fed into the needling machine, the needling machine is used to needle the fiber net into geotextile, the waste edge cutting machine is used to cut the waste edges on both sides of the geotextile obtained by needle punching, and the winding machine is used to roll the geotextile with the waste edges cut into a cloth roll.

[0016] Furthermore, in the above technical solution, the bottom of the silo is conical, the discharge port is arranged at the top of the cone, and the raw materials are dried polyester chips or polypropylene chips, the viscosity of the polyester chips is greater than 0.64, and the melt index of the polypropylene chips is less than 25g / 10min.

[0017] Furthermore, the melt extruder includes a barrel and a screw and a heating assembly arranged in the barrel, one end of the screw is connected to a drive motor, one end of the barrel forms a raw material inlet end, and the other end forms a molten raw material outlet end.

[0018] Furthermore, the spinning box has a raw material inlet end, which is connected to the outlet end of the melt filter. The raw material inlet end of the spinning box is provided with a diverter, and each outlet end of the diverter is connected to the inlet end of the metering pump of each group of spinning devices.

[0019] Furthermore, the spinneret is provided with 800 spinneret holes, and the diameter of the spinneret holes is 0.45 mm.

[0020] Furthermore, the cooling device includes an annular wind window, and several thin streams of melt ejected from the spinneret are cooled into fiber filaments in the cooling air blown out by the annular wind window. The temperature range of the cooling air used to cool polyester fibers is 18 to 24°C, and the temperature of the cooling air used to cool polypropylene fibers is 12°C.

[0021] Compared with the prior art, this application has at least the following beneficial effects:

[0022] 1. The present application provides a bunching and stretching device for geotextile spinning, which mechanically bunches and stretches fiber bundles through three stretching roller units with successively increasing stretching speeds, thereby optimizing the stretching process of the fibers during the spinning process. This not only solves the current limitations of polyester geotextiles in the selection of raw material slice viscosity, but also solves the current limitations of polypropylene geotextiles in the spinning stretching speed: For polyester geotextiles, the present application gradually stretches the fibers in different stretching roller units by using a bunching and stretching device, and the stretching speed of each unit gradually increases, which helps to optimize the stretching process of high-viscosity polyester, can adapt to polyester raw materials with higher viscosity, and can effectively reduce the resistance in the stretching of high-viscosity polyester fibers through graded stretching. , making the fiber stretching more uniform, thereby improving the strength and quality of the fiber; for polypropylene geotextile, this application divides the stretching process into multiple stages and uses stretching roller units of different speeds to gradually increase the stretching speed, which can avoid the violent stretching of the fiber by a single high-speed stretching, helps to balance the stretching resistance during the stretching process, and reduces the risk of fiber breakage. Compared with the traditional polypropylene single-spindle filament bundle stretching, this application can increase the stretching speed of polypropylene fibers to improve fiber strength; therefore, the geotextile spinning bundling and stretching device provided by this application can be used for both polyester geotextile and polypropylene geotextile. The mechanical bundling and stretching device solves the bottleneck of the existing technology and effectively improves the tensile strength of the two geotextiles.

[0023] 2. Based on a bundling and stretching device for geotextile spinning provided by the present application, the present application also provides a geotextile production line, which can be used for both polyester geotextile production and polypropylene geotextile production. The production line mechanically bundles and stretches polyester fiber bundles or polypropylene fiber bundles through a bundling and stretching device, replacing the conventional polyester fiber airflow stretching method. Since mechanical stretching has a strong stretching force, it can overcome the inherent large stretching resistance of fibers spun from high-viscosity slices, making it realistic to manufacture high-strength geotextiles from high-viscosity polyester slices. At the same time, for polypropylene geotextile, the present application changes the conventional single-spindle mechanical stretching that is prone to wire breakage to a multi-spindle combined mechanical bundling stretching that is not prone to wire breakage, which can increase the stretching speed and thus increase the strength of the fiber.

[0024] 3. The geotextile production line provided by the present application greatly simplifies the structure of the spinning box. In the traditional production line for polypropylene geotextile, 96 sets of metering pumps, 96 sets of complex spinning structures, and complex piping systems are used in the spinning box. The production line provided by the present application only needs 6 sets of spinning devices, each of which includes a metering pump and a spinneret. Therefore, the present application uses bundle stretching to greatly simplify the original 96 sets of independent polypropylene geotextile mechanical stretching systems, making the production line simpler and reducing equipment investment costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. It should be understood that the specific shapes and structures shown in the drawings should not generally be regarded as limiting conditions for implementing the present application; for example, based on the technical concepts and exemplary drawings disclosed in this application, those skilled in the art are able to easily make routine adjustments or further optimizations to the addition / reduction / attribution division, specific shapes, positional relationships, connection methods, and dimensional ratios of certain units (components).

[0026] Figure 1 This is a schematic diagram of the main structural principle of the geotextile production line provided by the present application in one embodiment;

[0027] Figure 2 This is a flowchart of the process of producing geotextiles using the geotextile production line provided by this application in one embodiment.

[0028] Description of reference numerals:

[0029] 1. Material silo; 2. Melt extruder; 3. Melt filter; 4. Spinning box; 41. Spinning device; 411. Metering pump; 5. Cooling device; 6. Bundling drafting box; 61. First drafting roller unit; 62. Second drafting roller unit; 63. Third drafting roller unit; 7. Wire separation device; 71. Wire separation wheel; 8. Wire feeder. DETAILED DESCRIPTION

[0030] The present application will be further described below in detail through specific embodiments in conjunction with the accompanying drawings.

[0031] In the description of this application: unless otherwise specified, the meaning of "plurality" is two or more. The terms "first", "second", "third", etc. in this application are intended to distinguish the objects referred to and do not have any special meaning in terms of technical connotation (for example, they should not be understood as emphasizing the importance or order, etc.). Expressions such as "including", "comprising", "having", etc. also mean "not limited to" (certain units, components, materials, steps, etc.).

[0032] Terms such as "upper," "lower," "left," "right," and "center" used in this application are generally intended to facilitate intuitive understanding when compared with the accompanying drawings and are not intended to be absolute limitations on positional relationships in actual products. Changes to these relative positional relationships are considered within the scope of this application without departing from the technical concepts disclosed herein.

[0033] Example 1

[0034] This embodiment provides a cluster drafting device for geotextile spinning, which mainly includes a cluster drafting box 6 and a first drafting roller unit 61, a second drafting roller unit 62 and a third drafting roller unit 63 arranged in the cluster drafting box 6. Figure 1 . Specifically, the bunching drafting box 6 is provided with a fiber bundle inlet and a fiber bundle outlet, and a fiber bundle composed of a plurality of fiber filaments enters the bunching drafting box 6 from the fiber bundle inlet; each drafting roller unit includes a plurality of drafting rollers parallel to each other, and the drafting speed of the first drafting roller unit 61, the drafting speed of the second drafting roller unit 62, and the drafting speed of the third drafting roller unit 63 increase successively. After entering the bunching drafting box 6, the fiber bundle is sequentially drafted by the first drafting roller unit 61, the second drafting roller unit 62, and the third drafting roller unit 63, and the drafted fiber bundle is output from the fiber bundle outlet. Since the drafting resistance after bundling is relatively large, hot air must be introduced into the bunching drafting box 6, that is, the bunching drafting box 6 of the present application is provided with a hot air inlet and an air outlet for balancing the air pressure.

[0035] In this embodiment, each drafting roller unit includes two drafting rollers arranged parallel to each other and offset vertically. Of course, in other embodiments, each drafting roller unit may also include three or more drafting rollers arranged parallel to each other and offset vertically. Since the drafting resistance after bundle formation is relatively large, the number of rollers can be appropriately increased as needed, or the separator roller can be arranged with multiple turns around the drafting roller to increase the roller's grip on the fiber bundle.

[0036] In this embodiment, one drafting roller in each drafting roller unit serves as a drive roller connected to the output of the motor, while the remaining drafting rollers are connected to the drive roller via a synchronous belt. Of course, in other embodiments, the drive roller may also be connected to the remaining drafting rollers via other transmission methods, such as gear transmission or chain transmission. In this embodiment, a synchronous belt transmission is preferred. Compared to other belt transmission methods, the synchronous belt does not slip. The synchronous belt utilizes the teeth of the synchronous belt to mesh with the teeth of the transmission wheel, transmitting motion from one drafting roller to the other via the synchronous belt, thereby achieving synchronous rotation of the two rollers. Consequently, the speeds of the two rollers are strictly consistent. Furthermore, compared to chain transmission, the permissible speed of the synchronous belt is higher, meeting the speed requirements of this application.

[0037] In this embodiment, the first drafting roller unit 61, the second drafting roller unit 62 and the third drafting roller unit 63 are arranged in sequence from left to right in the bundling drafting box 6. Each drafting roller unit includes two drafting rollers that are parallel to each other and staggered up and down. The fiber bundle entering the bundling drafting box 6 is wound around each drafting roller in sequence along an S-shaped route.

[0038] Therefore, the present application provides a bundling and stretching device for geotextile spinning, which can mechanically bundle and stretch the fiber bundles through three stretching roller units with successively increasing stretching speeds, thereby optimizing the fiber stretching process during the spinning process. It not only solves the current limitations of polyester geotextiles in the selection of raw material slice viscosity, but also solves the current limitations of polypropylene geotextiles in the spinning stretching speed: for polyester geotextiles, the present application gradually stretches the fibers in different stretching roller units by using a bundling and stretching device, and the stretching speed of each unit gradually increases, which helps to optimize the stretching process of high-viscosity polyester, can adapt to polyester raw materials with higher viscosity, and through graded stretching, can effectively reduce the resistance in the stretching of high-viscosity polyester fibers. , making the fiber stretching more uniform, thereby improving the strength and quality of the fiber; for polypropylene geotextile, this application divides the stretching process into multiple stages and uses stretching roller units of different speeds to gradually increase the stretching speed, which can avoid the violent stretching of the fiber by a single high-speed stretching, helps to balance the stretching resistance during the stretching process, and reduces the risk of fiber breakage. Compared with the traditional polypropylene single-spindle filament bundle stretching, this application can increase the stretching speed of polypropylene fibers to improve fiber strength; therefore, the geotextile spinning bundling and stretching device provided by this application can be used for both polyester geotextile and polypropylene geotextile. The mechanical bundling and stretching device solves the bottleneck of the existing technology and effectively improves the tensile strength of the two geotextiles.

[0039] Example 2

[0040] This embodiment provides a geotextile production line, including the geotextile spinning bundling and stretching device provided in the above-mentioned embodiment 1, and also includes a silo 1, a melt extruder 2, a melt filter 3, a spinning box 4, a cooling device 5, a wire separation device 7, a wire guide device, a wire feeder 8, a wire swing machine, a needle punching machine, a waste edge cutting machine and a winding machine.

[0041] The above-mentioned silo 1 is used to store raw materials (polyester chips or polypropylene chips). The silo 1 has a feed port and a discharge port, and the discharge port is connected to the inlet end of the melt extruder 2.

[0042] The above-mentioned melt extruder 2 is used to heat and extrude the raw materials fed therein, and the molten raw materials are discharged from the outlet end of the melt extruder 2 to the melt filter 3. The molten raw materials can enter the melt filter 3 along the melt pipe of the melt extruder 2.

[0043] The melt filter 3 has a filter element for filtering the molten raw material.

[0044] The above-mentioned spinning box 4 is provided with one or more spinning devices 41 (for example, six spinning devices 41 are provided), each spinning device 41 includes a metering pump 411 and a spinneret arranged at the outlet end of the metering pump 411, the inlet end of the metering pump 411 is connected to the raw material outlet end of the melt filter 3, and a plurality of spinneret holes are provided on the spinneret; a cooling device 5 is provided at the outlet end of each spinning device 41.

[0045] The cooling device 5 is used to cool the melt stream ejected from the spinneret hole into fiber filaments. Several fiber filaments are gathered into bundles and enter the bundling and stretching device for geotextile spinning.

[0046] The outlet end of the geotextile spinning bundling and stretching device is connected to the yarn separation device 7.

[0047] The above-mentioned fiber separation device 7 is used to separate the fiber bundle after the bundle is drawn into several bundles, each bundle includes several fiber filaments, and preferably the number of fiber filaments in each bundle is the same. The fiber separation device 7 includes several fiber separation wheels 71, such as Figure 1 The dividing wheel 71 is used to separate the fiber bundles during the spinning process. In this application, a fiber bundle containing 800 fiber filaments is divided into two, two into four, four into eight, and finally eight into sixteen bundles, each containing 50 fiber filaments.

[0048] The above-mentioned wire guide device includes a plurality of wire guide wheels, each of which is used to guide each bundle of fiber yarn into the corresponding spindle position, and a wire feeder 8 is provided at each spindle position.

[0049] The wire feeder 8 is used to feed each bundle of fiber yarn into the swing wire machine.

[0050] The above-mentioned oscillating wire machine is used to oscillate and lay the fiber yarns fed into it, and the fiber web obtained by laying the fiber web by the oscillating wire machine is fed into the needle punching machine.

[0051] The needle punching machine is used to needle punch the fiber mesh into geotextile.

[0052] The waste edge cutting machine is used to cut off the waste edges on both sides of the geotextile obtained by needle punching.

[0053] The winding machine is used to roll the geotextile with the waste edges cut off into a roll of a certain length, which can be packaged and stored in the back end.

[0054] In this embodiment, it is preferred that the bottom of the silo 1 is set to be conical, and the discharge port is set at the top of the cone to facilitate the output of raw materials.

[0055] Since the production line provided in this application can be used for the production of both polyester geotextiles and polypropylene geotextiles, the raw materials fed into the silo 1 can be dried polyester chips or polypropylene chips.

[0056] Since the present application mechanically bundles and stretches the polyester fiber bundles through a bundling and stretching device, replacing the conventional polyester fiber airflow stretching method, it can adapt to polyester raw materials with higher viscosity. Therefore, the relative viscosity of the polyester chips used in the present application can be greater than 0.64, effectively solving the current limitations of polyester geotextiles in the selection of raw material chip viscosity.

[0057] Because the present invention divides the drafting process into multiple stages through a cluster drafting device and uses drafting roller units of varying speeds to gradually increase the drafting speed, it can avoid the drastic stretching of the fibers caused by a single high-speed drafting. Therefore, the present invention can increase the drafting speed of polypropylene fibers, effectively addressing the current limitations on spinning drafting speeds for polypropylene geotextiles. The melt index of the polypropylene chips in the present invention can be less than 25g / 10min.

[0058] In this embodiment, the melt extruder 2 primarily comprises a barrel, a screw disposed within the barrel, and a heating assembly. One end of the screw is connected to a drive motor. One end of the barrel forms the raw material inlet, while the other end forms the molten raw material outlet. Within the barrel, the raw material is gradually compressed by the rotation of the screw and the heating of the barrel. This increases the raw material temperature, breaks the molecular chains, and causes the raw material to become molten and possess a certain degree of fluidity.

[0059] In this embodiment, the spinning box 4 has a raw material inlet end, which is connected to the outlet end of the melt filter 3. The raw material inlet end of the spinning box 4 is provided with a diverter, and each outlet end of the diverter is connected to the inlet end of the metering pump 411 of each group of spinning devices 41. Therefore, in this application, the rear end of the melt filter 3 can be connected to multiple groups of spinning devices 41.

[0060] In a specific embodiment, each spinneret is provided with 800 spinneret holes, each having a diameter of 0.45 mm. Each metering pump 411 has a capacity of 100 cc. Under the pressure of the metering pump 411, the molten raw material is ejected from the spinneret holes to form melt streams. Each spinneret can eject 800 melt streams. The cooling device 5 includes an annular air window. The melt streams ejected from the spinneret are cooled into fiber filaments by the cooling air blown out from the annular air window. The temperature of the cooling air used to cool polyester fibers ranges from 18 to 24°C, and the temperature of the cooling air used to cool polypropylene fibers is approximately 12°C.

[0061] The 800 cooled fiber filaments are gathered into a bundle and enter the bundle drawing device. In the bundle drawing box 6, the first drawing roller unit 61, the second drawing roller unit 62 and the third drawing roller unit 63 (that is, from the low-speed roller to the medium-speed roller and then to the high-speed roller) are used to complete the drawing process of the fiber bundle in sequence. After drawing, the fibers become thinner and longer, and the internal molecular structure is neatly arranged, with high strength and low elongation quality.

[0062] The fiber bundle consisting of 800 fiber filaments is mechanically bundled and stretched by the bundle drawing device, and then output from the bundle drawing box 6. The fiber bundle containing 800 fiber filaments is divided into two, two into four, four into eight, and finally eight into sixteen bundles through the wire dividing device 7 or the operator. Each bundle contains 50 fiber filaments. Each bundle of fiber filaments is then introduced into the wire feeder 8 at the corresponding spindle position through the wire guide wheel. The air flow in the wire feeder 8 drives the fiber through the wire guide tube and feeds it into the swing wire machine for swing wire laying. The subsequent process is the same as the traditional production line. After the fiber net enters the needle punching machine, it is needle-punched into a non-woven fabric, i.e., geotextile. Finally, the waste edges on both sides of the geotextile are cut off, and the cloth rolls of a certain length are rolled on the winding machine and packaged for storage.

[0063] Therefore, the geotextile production line provided by the present application can be used for both polyester geotextile production and polypropylene geotextile production. The production line mechanically bundles and stretches polyester fiber bundles or polypropylene fiber bundles through a bundling and stretching device, replacing the conventional polyester fiber airflow stretching method. Since mechanical stretching has a strong stretching force, it can overcome the inherent large stretching resistance of fibers spun from high-viscosity slices, making it realistic to manufacture high-strength geotextiles from high-viscosity polyester slices. At the same time, for polypropylene geotextiles, the present application changes the conventional single-spindle mechanical stretching that is prone to wire breakage to a multi-spindle combined mechanical bundle stretching that is not prone to wire breakage, which can increase the stretching speed and thus increase the strength of the fiber.

[0064] In a specific application example, the space occupied by the wire splitting operation area of ​​the production line provided in this application is about 2 meters. A total of 6 sets of bunching and drawing boxes 6 are arranged on the front and back sides of the wire splitting operation area, with 3 groups of bunching and drawing boxes 6 and 48 spindle positions on each side. During the wire splitting operation, needle-shaped wire splitting rods and wire suction guns can be used to separate the fibers. Several waste wire collectors can also be set up to facilitate the wire splitting operation. The waste wire collectors are mainly used to collect waste fibers or unqualified parts generated during the wire splitting process to prevent these waste materials from polluting the production environment and ensure a smooth and efficient production process.

[0065] The geotextile production line provided by this application can greatly simplify the structure of the spinning box 4. In the traditional production line for polypropylene geotextile, the spinning box 4 uses 96 sets of metering pumps 411, 96 sets of complex spinning structures, and a complex piping system in the box. The configuration of the production line provided by this application is mainly based on a cluster box consisting of six sets of spinning devices 41, six sets of annular blowing devices and six sets of cluster drawing devices. Each set of spinning devices 41 includes a metering pump 411 and a spinneret. Therefore, this application uses cluster drawing to greatly simplify the original 96 sets of independent polypropylene geotextile mechanical drawing systems, making the production line simpler and reducing equipment investment costs.

[0066] Example 3

[0067] This embodiment provides a production process for geotextiles, using the geotextile production line provided in the above embodiment 2. The production process includes the following steps: Figure 2 :

[0068] S1: Raw material input: If polyester geotextile is to be made, polyester chips with intrinsic viscosity > 0.64 can be selected and put into silo 1 after drying. If polypropylene geotextile is to be made, polypropylene chips with melt index < 25g / 10min can be selected and put into silo 1.

[0069] S2: Melt extrusion: After the raw materials in the silo 1 enter the melt extruder 2, under the dual action of heating and mechanical force, the raw material slices are heated and melted and output;

[0070] S3: Melt Filtration: The melt filter 3 is used to remove impurities from the molten raw material. The pressure-molten raw material in the melt extruder 2 enters the melt filter 3 along the melt pipe;

[0071] S4: Spinning: The filtered molten raw material is spun by the spinning device 41 in the spinning box 4. The molten raw material is ejected into a plurality of thin melt streams by the metering pump 411 and the spinneret provided at the outlet end of the metering pump 411;

[0072] S5: Cooling: Cooling the plurality of melt streams by the cooling device 5 to obtain a plurality of fiber filaments;

[0073] S6: Bunching and drawing: several fiber filaments are gathered into bundles and fed into the geotextile spinning bundling and drawing device for mechanical bundling and drawing;

[0074] S7: Splitting: The fiber bundle after the bundle drafting is divided into several bundles by the splitting device 7, each bundle includes several fiber filaments, and the number of fiber filaments in each bundle is the same;

[0075] S8: feeding and laying the fiber web: feeding each bundle of fiber filaments into the swing wire machine through the wire feeder 8 for swing wire laying to obtain a fiber web;

[0076] S9: Needle punching into fabric: The fiber mesh is needle punched into geotextile by a needle punching machine, and the waste edges on both sides of the geotextile are cut off by a waste edge cutting machine;

[0077] S10: Rolling: The geotextile with the waste edges cut off is rolled into a roll by a winding machine.

[0078] Therefore, this embodiment provides a method for manufacturing high-strength geotextiles by a bundle drafting method, which can not only solve the current limitations of polyester geotextiles in the selection of raw material chip viscosity, but also solve the current limitations of polypropylene geotextiles in the spinning drafting speed. The strength of both polyester and polypropylene geotextiles is closely related to the fiber strength, and the fiber drafting speed determines the fiber strength. Therefore, this application is a technical innovation for further improving the product strength of the two geotextiles. When using the production process provided by this application to make polyester geotextiles, polyester chips with a characteristic viscosity of >0.64 can be selected, because drafting is mechanically rigid, and high-viscosity chip spinning can adapt to mechanical drafting; when using the production process provided by this application to make polypropylene geotextiles, the bundle drafting is a coarse bundle synthesized from multiple fibers, which is not as easy to break as a single-spindle fine filament bundle. The drafting speed can be appropriately increased to improve the fiber strength.

[0079] The technical features of the above embodiments can be combined arbitrarily (as long as there is no contradiction in the combination of these technical features). In order to make the description concise, not all possible combinations of the technical features in the above embodiments are described; these embodiments that are not explicitly written should also be considered to be within the scope of this specification.

[0080] The present application has been described in a relatively specific and detailed manner through general explanations and specific embodiments. It should be understood that, based on the technical concept of the present application, several conventional adjustments or further innovations may be made to these specific embodiments; however, as long as they do not depart from the technical concept of the present application, the technical solutions obtained by such conventional adjustments or further innovations also fall within the scope of protection of the claims of the present application.

Claims

1. A bundle-drawing device for geotextile spinning, characterized in that: The invention comprises a bunching drafting box, wherein the bunching drafting box is provided with a fiber bundle inlet and a fiber bundle outlet, and a fiber bundle consisting of a plurality of fiber filaments enters the bunching drafting box from the fiber bundle inlet; a first drafting roller unit, a second drafting roller unit and a third drafting roller unit are provided in the bunching drafting box, and each drafting roller unit comprises a plurality of drafting rollers parallel to each other, the drafting speed of the first drafting roller unit is lower than the drafting speed of the second drafting roller unit, and the drafting speed of the second drafting roller unit is lower than the drafting speed of the third drafting roller unit, the first drafting roller unit, the second drafting roller unit and the third drafting roller unit sequentially draft the fiber bundle entering the bunching drafting box, and the drafted fiber bundle is output from the fiber bundle outlet; The bunching and stretching box is provided with a hot air inlet and an air outlet for balancing the air pressure.

2. The geotextile spinning bundling and stretching device according to claim 1, characterized in that: The first drafting roller unit includes two drafting rollers that are parallel to each other and staggered in an upper and lower direction, one of which is connected to the output end of the first motor as a driving roller, and the two drafting rollers are connected by a first synchronous belt transmission; The second drafting roller unit includes two drafting rollers that are parallel to each other and staggered in an upper and lower direction, one of which is connected to the output end of the second motor as a driving roller, and the two drafting rollers are connected by a second synchronous belt transmission; The third drafting roller unit includes two drafting rollers that are parallel to each other and staggered in an upper and lower direction, one of which is connected to the output end of the third motor as a driving roller, and the two drafting rollers are connected by a third synchronous belt transmission; The first drafting roller unit, the second drafting roller unit and the third drafting roller unit are arranged in sequence, and the fiber bundle entering the bundle drafting box is wound around each drafting roller in sequence along an S-shaped route.

3. A geotextile production line, characterized in that: The geotextile spinning bundling and drawing device according to any one of claims 1 to 2 further comprises a silo, a melt extruder, a melt filter, a spinning box, a cooling device, a wire separation device, a wire guide device, a wire feeder, a wire swing machine, a needle punch, a waste edge cutting machine and a winding machine, wherein: The silo is used to store raw materials, and the silo has a feed port and a discharge port, the discharge port is connected to the inlet end of the melt extruder, the melt extruder is used to heat and extrude the raw materials fed therein, and the molten raw materials are discharged from the outlet end of the melt extruder to the melt filter, and the melt filter is used to filter the molten raw materials; one or more spinning devices are arranged in the spinning box, each spinning device includes a metering pump and a spinneret arranged at the outlet end of the metering pump, the inlet end of the metering pump is connected to the raw material outlet end of the melt filter, and the spinneret is provided with a plurality of spinnerets; the outlet end of each spinning device is provided with a cooling device, and the cooling device is used to cool the melt stream ejected from the spinneret into fiber filaments, and a plurality of the fiber filaments are gathered together The fibers are bundled and enter the geotextile spinning bundling and stretching device, the outlet end of the geotextile spinning bundling and stretching device is connected to the wire dividing device, the wire dividing device is used to divide the bundled and stretched fibers into several bundles, each bundle including several fiber filaments; the wire guide device includes a plurality of wire guide wheels, each wire guide wheel is used to introduce each bundle of fiber filaments into the corresponding spindle position, and each spindle position is provided with a wire feeder, the wire feeder is used to feed each bundle of fiber filaments into the swing wire machine, the swing wire machine is used to swing the fiber filaments fed into it and lay a net, the fiber net obtained by laying the net by the swing wire machine is fed into the needling machine, the needling machine is used to needle the fiber net into geotextile, the waste edge cutting machine is used to cut the waste edges on both sides of the geotextile obtained by needle punching, and the winding machine is used to roll the geotextile with the waste edges cut into a cloth roll.

4. The geotextile production line according to claim 3, characterized in that: The bottom of the silo is conical, and the discharge port is set at the top of the cone. The raw materials are dried polyester chips or polypropylene chips. The viscosity of the polyester chips is greater than 0.64, and the melt index of the polypropylene chips is less than 25g / 10min.

5. The geotextile production line according to claim 3, characterized in that: The melt extruder includes a barrel, a screw and a heating assembly arranged in the barrel, one end of the screw is connected to a driving motor, one end of the barrel forms a raw material inlet end, and the other end forms a molten raw material outlet end.

6. The geotextile production line according to claim 3, characterized in that: The spinning box has a raw material inlet end, which is connected to the outlet end of the melt filter. The raw material inlet end of the spinning box is provided with a diverter, and each outlet end of the diverter is connected to the inlet end of the metering pump of each group of spinning devices.

7. The geotextile production line according to claim 3, characterized in that: The spinneret is provided with 800 spinneret holes, each having a diameter of 0.45 mm.

8. The geotextile production line according to claim 3, characterized in that: The cooling device includes an annular wind window. Several thin streams of melt ejected from the spinneret are cooled into fiber filaments in the cooling air blown out from the annular wind window. The temperature range of the cooling air used to cool polyester fibers is 18 to 24°C, and the temperature of the cooling air used to cool polypropylene fibers is 12°C.

Images