Bundling and drafting device for geotextile spinning and geotextile production line and production process

Abstract

The invention discloses a bundling and drafting device for geotextile spinning and a geotextile production line and a production technology.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 and the corresponding production technology can adapt to polyester raw materials with higher viscosity, and the production efficiency is improved. The tensile strength of the prepared polyester geotextile 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 and production process including the device. Background Art

[0002] Geotextile is a kind of building material that can play the role of stratification, water filtration, stabilization and reinforcement. It is widely used in engineering construction such as road construction, water conservancy facilities, and environmental protection. At present, the geotextiles widely used in engineering applications are polyester (PET) geotextile and polypropylene (PP) geotextile. The tensile strength of geotextile is one of the key factors affecting its performance. Therefore, improving the tensile strength of geotextile 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. The patent scheme is to improve the fiber strength of polyester geotextile by improving the raw materials and related content ratios of the production of the polyester geotextile. For another example, Chinese invention patent CN113668080A discloses a spinning and drawing device and a polypropylene filament geotextile production line. The 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 in sequence, 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] At present, the spinning process of polyester (PET) geotextile is mainly completed by air drafting technology. Air drafting technology is a process that uses air flow to stretch fibers. The air drafting process is as follows: the fiber is sent into an air flow area, and the fiber is stretched under the action of the air flow by adjusting the air flow speed and pressure. The speed and direction of the air flow determine the degree of fiber stretching and the change of fiber morphology. In the air flow, the fiber is stretched by the force of air flow, which increases the length of the fiber and makes the diameter thinner. The molecular structure of the fiber will be rearranged, thereby improving the strength and flexibility of the fiber. At present, polyester (PET) geotextile mainly uses polyester chips with an intrinsic viscosity of 0.64 in raw material selection. This is because it has been proved in practice that this viscosity chip is very compatible with the air drafting process during spinning, and can effectively control the fiber quality during the spinning process. However, when a polyester chip with a higher viscosity is further selected, the air drafting will be limited during the spinning process due to the increase in viscosity, resulting in difficulty in stretching the fiber, thereby affecting the strength and quality of the final fiber. Therefore, the strength improvement of polyester (PET) geotextile is currently limited in the selection 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 a separate drawing unit to each bundle of fine fibers. These drawing units are generally composed of traction rollers. The fibers are stretched by applying tension to them. 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 the production 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 stretched unevenly, 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, and 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. Summary of the invention

[0007] The present application provides a geotextile spinning bundling and stretching device, a geotextile production line, and a production process, 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 arranged 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 arranged on the bunching and stretching box.

[0010] Further in the above technical solution, the first drafting roller unit includes two drafting rollers which 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 by a first synchronous belt transmission.

[0011] Furthermore, the second drafting roller unit includes two drafting rollers which 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 by a second synchronous belt transmission.

[0012] Furthermore, the third drafting roller unit includes two drafting rollers which 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 by 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 bundling 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, including the above-mentioned geotextile spinning bundling and stretching device, and also includes 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 of which 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 a plurality of spinnerets are arranged on the spinneret; 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 hole 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 a plurality of bundles, each bundle including a plurality of 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 a corresponding spindle position, 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 to form a web, the fiber web obtained by the swing wire machine is fed into the needling machine, the needling machine is used to needle the fiber web into geotextile, the waste edge cutting machine is used to cut off 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 off into a cloth roll.

[0016] Further in the above technical solution, the bottom of the silo is conical, the discharge port is arranged at the top of the cone, the raw material is 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 driving 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 a plurality of melt streams 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 the polyester fiber is 18 to 24°C, and the temperature of the cooling air used to cool the polypropylene fiber is 12°C.

[0021] In another aspect, the present application provides a production process of a geotextile, using the above-mentioned geotextile production line, the production process comprises the following steps:

[0022] S1: Add raw materials into the silo;

[0023] S2: the raw materials in the silo enter the melt extruder, are heated and melted, and then the molten raw materials are output;

[0024] S3: using the melt filter to remove impurities from the molten raw material;

[0025] S4: spinning the filtered molten raw material through the spinning device in the spinning box, and the molten raw material is sprayed into a plurality of melt thin streams by the metering pump and the spinneret arranged at the outlet end of the metering pump;

[0026] S5: cooling the plurality of melt streams by the cooling device to obtain a plurality of fiber filaments;

[0027] S6: Gathering the plurality of fiber filaments into a bundle and sending the bundle into the geotextile spinning bundling and stretching device for mechanical bundling and stretching;

[0028] S7: dividing the fiber bundle after the bundle drafting by the fiber dividing device into a plurality of bundles, each bundle including a plurality of fiber filaments, and the number of fiber filaments in each bundle is the same;

[0029] S8: feeding each bundle of fiber filaments into a swing wire machine through the wire feeder for swing wire laying to obtain a fiber web;

[0030] S9: needle-punching the fiber web into a geotextile by the needle-punching machine, and using the waste edge cutting machine to cut off the waste edges on both sides of the geotextile;

[0031] S10: The geotextile with the waste edges cut off is rolled into a roll by a winding machine.

[0032] Compared with the prior art, this application has at least the following beneficial effects:

[0033] 1. The present application provides a bundling and stretching device for geotextile spinning, which mechanically bundles 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 can not only solve the limitations of the current polyester geotextile in the selection of raw material slice viscosity, but also solve the limitations of the current polypropylene geotextile in the spinning stretching speed: For polyester geotextile, 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, the present 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 drastic stretching of the fiber by a single high-speed stretching, help balance the stretching resistance during the stretching process, and reduce the risk of fiber breakage. Compared with the traditional polypropylene single-spindle filament bundle stretching, the present application can increase the stretching speed of polypropylene fibers to improve the fiber strength; therefore, the geotextile spinning bundling and stretching device provided by the present application can be used for both polyester geotextile and polypropylene geotextile. The bottleneck of the existing technology is solved by the mechanical bundling and stretching device, and the tensile strength of the two geotextiles is effectively improved.

[0034] 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 the production of both polyester geotextile and polypropylene geotextile. The production line uses a bundling and stretching device to mechanically bundle and stretch polyester fiber bundles or polypropylene fiber bundles, replacing the conventional airflow stretching method of polyester fibers. 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.

[0035] 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 cluster drawing to greatly simplify the original 96 sets of independent polypropylene geotextile mechanical drawing systems, making the production line simple and reducing equipment investment costs.

[0036] 4. Based on a geotextile production line provided by the present application, the present application provides a geotextile production process, which can be used for the production of both polyester geotextiles and polypropylene geotextiles. The process 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 possible to manufacture high-strength geotextiles from high-viscosity polyester slices. At the same time, for polypropylene geotextiles, the process 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. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following is a brief introduction to 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 usually be regarded as limiting conditions for implementing the present application; for example, based on the technical concepts and exemplary drawings disclosed in the present application, those skilled in the art are able to easily make routine adjustments or further optimizations to the increase / decrease / attribution division, specific shapes, positional relationships, connection methods, and dimensional ratios of certain units (components).

[0038] Figure 1 This is a schematic diagram of the main structure principle of a geotextile production line provided by the present application in one embodiment;

[0039] Figure 2 The present invention is a flowchart of a geotextile production process provided by the present application in one embodiment.

[0040] Description of reference numerals:

[0041] 1. Silo; 2. Melt extruder; 3. Melt filter; 4. Spinning box; 41. Spinning device; 411. Metering pump; 5. Cooling device; 6. Bundling and drawing box; 61. First drawing roller unit; 62. Second drawing roller unit; 63. Third drawing roller unit; 7. Wire separation device; 71. Wire separation wheel; 8. Wire feeder. DETAILED DESCRIPTION

[0042] The present application is further described below in detail through specific embodiments in conjunction with the accompanying drawings.

[0043] 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 special meanings in terms of technical connotations (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.).

[0044] The terms such as "upper", "lower", "left", "right", "middle", etc. used in this application are usually used to facilitate intuitive understanding by comparing with the accompanying drawings, and are not absolute limitations on the positional relationship in the actual product. Without departing from the technical concept disclosed in this application, changes in these relative positional relationships should also be regarded as the scope of this application.

[0045] Embodiment 1

[0046] This embodiment provides a geotextile spinning bundling and drafting device, which mainly includes a bundling and 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 bundling and drafting box 6. Figure 1 . Specifically, a fiber bundle inlet and a fiber bundle outlet are provided on the bunching and drawing box 6, and a fiber bundle composed of a plurality of fiber filaments enters the bunching and drawing box 6 from the fiber bundle inlet; each drawing roller unit includes a plurality of drawing rollers parallel to each other, and the drawing speeds of the first drawing roller unit 61, the second drawing roller unit 62, and the third drawing roller unit 63 increase in sequence. After the fiber bundle enters the bunching and drawing box 6, it is drawn in sequence by the first drawing roller unit 61, the second drawing roller unit 62, and the third drawing roller unit 63, and the drawn fiber bundle is output from the fiber bundle outlet. Since the drawing resistance after bunching is relatively large, hot air must be introduced into the bunching and drawing box 6, that is, the bunching and drawing box 6 of the present application is provided with a hot air inlet and an air outlet for balancing the air pressure.

[0047] In this embodiment, each drafting roller unit includes two drafting rollers that are parallel to each other and staggered up and down. Of course, in other embodiments, each drafting roller unit may also include three or more drafting rollers that are parallel to each other and staggered up and down. Since the drafting resistance after bundling is relatively large, the number of rollers may be appropriately increased as needed, or the drafting roller may be wound around the drafting roller for multiple turns after the separation roller is configured to increase the roller's grip on the fiber bundle.

[0048] In this embodiment, one drafting roller in each drafting roller unit is connected to the output end of the motor as a driving roller, and the other drafting rollers are connected to the driving roller through a synchronous belt. Of course, in other embodiments, the driving roller can also be connected to the other drafting rollers through other transmission methods such as gear transmission and chain transmission. In this embodiment, the synchronous belt transmission method is preferably used. Compared with other belt transmission methods, the synchronous belt will not slip. It uses the tooth shape of the synchronous belt to mesh with the tooth groove of the transmission wheel, and transmits the motion from one drafting roller to another drafting roller through the synchronous belt, so as to achieve synchronous rotation of the two. Therefore, the speeds of the two rollers are strictly consistent; furthermore, compared with the chain transmission, the permissible speed of the synchronous belt is higher than that of the chain transmission, which can meet the speed requirements of this application.

[0049] In this embodiment, the first stretching roller unit 61, the second stretching roller unit 62 and the third stretching roller unit 63 are arranged in sequence from left to right in the bundling stretching box 6, and each stretching roller unit includes two stretching rollers that are parallel to each other and staggered up and down. The fiber bundle entering the bundling stretching box 6 is wound around each stretching roller in sequence along an S-shaped route.

[0050] Therefore, the geotextile spinning bundling and stretching device provided in the present application can mechanically bundle and stretch the fiber bundles through three stretching roller units with successively increasing stretching speeds, thereby optimizing the stretching process of the fibers during the spinning process. It not only solves the limitations of the current polyester geotextile in the selection of raw material slice viscosity, but also solves the limitations of the current polypropylene geotextile in the spinning stretching speed: for polyester geotextile, 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, the present 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 drastic stretching of the fiber by a single high-speed stretching, help balance the stretching resistance during the stretching process, and reduce the risk of fiber breakage. Compared with the traditional polypropylene single-spindle filament bundle stretching, the present application can increase the stretching speed of polypropylene fibers to improve the fiber strength; therefore, the geotextile spinning bundling and stretching device provided by the present application can be used for both polyester geotextile and polypropylene geotextile. The bottleneck of the existing technology is solved by the mechanical bundling and stretching device, and the tensile strength of the two geotextiles is effectively improved.

[0051] Embodiment 2

[0052] The present 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.

[0053] 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.

[0054] 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.

[0055] The melt filter 3 has a filter element for filtering the molten raw material.

[0056] The above-mentioned spinning box 4 is provided with one or more spinning devices 41 (for example, six spinning devices 41), 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 arranged on the spinneret; a cooling device 5 is arranged at the outlet end of each spinning device 41.

[0057] 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.

[0058] The outlet end of the above-mentioned geotextile spinning bundling and stretching device is connected to the wire separation device 7.

[0059] The above-mentioned wire splitting device 7 is used to split the fiber bundle after the bundle drawing into a plurality of bundles, each bundle includes a plurality of fiber filaments, and preferably the number of fiber filaments in each bundle is the same. The wire splitting device 7 includes a plurality of wire splitting wheels 71, such as Figure 1 The dividing wheel 71 is used to separate the fiber bundles during the spinning process. In the present 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, by a plurality of dividing wheels distributed step by step.

[0060] The above-mentioned wire guiding device includes a plurality of wire guiding wheels, each of which is used to guide each bundle of fiber filaments into a corresponding spindle position, and a wire feeder 8 is arranged at each spindle position.

[0061] The wire feeder 8 is used to feed each bundle of fiber filaments into the oscillating wire machine.

[0062] 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.

[0063] The needle punching machine is used to needle the fiber net into geotextile.

[0064] The waste edge cutting machine is used to cut off the waste edges on both sides of the geotextile obtained by needle punching.

[0065] The winding machine is used to roll the geotextile with the waste edges cut off into a roll of a certain length, and the roll can be packaged and stored in the back-end.

[0066] 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 discharge of raw materials.

[0067] Since the production line provided in the present application can be used for the production of both polyester geotextile and polypropylene geotextile, the raw materials fed into the silo 1 can be dried polyester chips or polypropylene chips.

[0068] Since the present application uses a bundling and stretching device to mechanically bundle and stretch the polyester fiber bundles, 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, which effectively solves the current limitations on the selection of raw material chip viscosity for polyester geotextiles.

[0069] Since the present application divides the drafting process into multiple stages through a cluster drafting device and uses drafting roller units of different speeds to gradually increase the drafting speed, the drastic stretching of the fiber by a single high-speed drafting can be avoided. Therefore, the present application can increase the drafting speed of the polypropylene fiber and effectively solve the current limitation of the spinning drafting speed of the polypropylene geotextile. The melt index of the polypropylene slice in the present application can be less than 25g / 10min.

[0070] In this embodiment, the melt extruder 2 mainly 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, and the other end forms a molten raw material outlet. In the barrel, the raw material will be gradually compressed by the rotation of the screw and the heating of the barrel, the raw material temperature will rise, the molecular chain will break, and the raw material will become a molten state with a certain fluidity.

[0071] In this embodiment, the spinning box 4 has a raw material inlet end, and the raw material inlet end of the spinning box 4 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, the rear end of the melt filter 3 in this application can be connected to multiple groups of spinning devices 41.

[0072] In a specific embodiment, each spinneret is provided with 800 spinneret holes, each spinneret hole has an aperture of 0.45 mm, and each metering pump 411 has a specification 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, and each spinneret can eject 800 melt streams. The cooling device 5 includes an annular wind window, and the plurality of melt streams ejected from the spinneret are cooled into fiber filaments in the cooling wind blown out of the annular wind window. The temperature range of the cooling wind for cooling polyester fibers is 18 to 24°C, and the temperature of the cooling wind for cooling polypropylene fibers is about 12°C.

[0073] The 800 cooled fiber filaments are gathered into a bundle and enter the bundling and stretching device. In the bundling and stretching box 6, the first stretching roller unit 61, the second stretching roller unit 62 and the third stretching roller unit 63 (i.e., from the low-speed roller to the medium-speed roller and then to the high-speed roller) are sequentially graded to complete the stretching process of the fiber bundle. After stretching, the fibers become thinner and longer, the internal molecular structure is neatly arranged, and they have high strength and low elongation quality.

[0074] After 800 fiber filaments are gathered into a bundle and mechanically bundled and stretched by the bundling and stretching device, the fiber bundle is output from the bundling and stretching box 6, and 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, and each bundle of fiber filaments is then introduced into the wire feeder 8 at the corresponding spindle position through the wire guide wheel. Then, the air flow in the wire feeder 8 drives the fibers through the wire guide tube and feeds them 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., a 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.

[0075] Therefore, the geotextile production line provided by the present application can be used for the production of both polyester geotextiles and polypropylene geotextiles. The production line mechanically bundles and draws polyester fiber bundles or polypropylene fiber bundles through a bundling and drawing device, replacing the conventional airflow drawing method of polyester fibers. Since mechanical drawing has a strong drawing force, it can overcome the inherent large drawing 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 drawing that is prone to wire breakage to a multi-spindle combined mechanical bundling drawing that is not prone to wire breakage, which can increase the drawing speed and thus increase the strength of the fiber.

[0076] In a specific application example, the space occupied by the wire splitting operation area of ​​the production line provided in the present 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 to facilitate the wire splitting operation. The waste wire collectors are mainly used to collect waste fibers or unqualified parts generated in the wire splitting process to prevent these waste materials from polluting the production environment and ensure a smooth and efficient production process.

[0077] The geotextile production line provided by the present 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 the present application is mainly a cluster box composed of six sets of spinning devices 41, six sets of annular blowing devices and six sets of clustering and drawing devices. Each set of spinning devices 41 includes a metering pump 411 and a spinneret. Therefore, the present application uses clustering and drawing to greatly simplify the original 96 sets of independent polypropylene geotextile mechanical drawing systems, making the production line simple and reducing equipment investment costs.

[0078] Embodiment 3

[0079] This embodiment provides a production process of geotextiles, using the geotextile production line provided in the above-mentioned embodiment 2, and the production process includes the following steps: Figure 2 :

[0080] 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;

[0081] S2: Melt extrusion: After the raw materials in the silo 1 enter the melt extruder 2, under the dual effects of heating and mechanical force, the raw material slices are heated, melted and output;

[0082] S3: melt filtration: melt filter 3 is used to remove impurities and filter the molten raw material. The pressure-molten raw material in the melt extruder 2 enters the melt filter 3 along the melt pipe;

[0083] S4: Spinning: The filtered molten raw material is spun by the spinning device 41 in the spinning box 4, and the molten raw material is sprayed into a plurality of melt thin streams by the metering pump 411 and the spinneret arranged at the outlet end of the metering pump 411;

[0084] S5: Cooling: cooling the plurality of melt streams by means of a cooling device 5 to obtain a plurality of fiber filaments;

[0085] S6: Bunching and drawing: several fiber filaments are gathered into bundles and sent to the geotextile spinning bundling and drawing device for mechanical bundling and drawing;

[0086] S7: Splitting: Splitting the fiber bundle after the bundle drafting by the splitting device 7 into a plurality of bundles, each bundle including a plurality of fiber filaments, and the number of fiber filaments in each bundle is the same;

[0087] S8: feeding wire and laying web: feeding each bundle of fiber wire into the swing wire machine through the wire feeder 8 for swing wire laying to obtain a fiber web;

[0088] S9: Needle punching into fabric: The fiber net 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;

[0089] S10: Rolling: The geotextile with the waste edges cut off is rolled into a roll by a winding machine.

[0090] 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 slice 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 slices with a characteristic viscosity of >0.64 can be selected, because drafting is mechanically rigid, and high-viscosity slice 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 filament bundle synthesized from multiple fibers, which is not as easy to break as a single-spindle fine filament bundle, and the drafting speed can be appropriately increased to improve the fiber strength.

[0091] The technical features of the above embodiments may be arbitrarily combined (as long as there is no contradiction in the combination of these technical features). 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.

[0092] The above is a relatively specific and detailed description of the present application through general description and specific embodiments. It should be understood that, based on the technical concept of the present application, several conventional adjustments or further innovations can be made to these specific embodiments; however, as long as they do not deviate from the technical concept of the present application, the technical solutions obtained by these conventional adjustments or further innovations also fall within the scope of protection of the claims of the present application.

Claims

1. A bundling and stretching device for geotextile spinning, characterized in that: The invention comprises a bunching drafting box, wherein a fiber bundle inlet and a fiber bundle outlet are provided on the bunching drafting box, 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 arranged in the bunching drafting box, and each drafting roller unit comprises a plurality of mutually parallel drafting rollers, and a drafting speed of the first drafting roller unit is lower than a drafting speed of the second drafting roller unit, and a drafting speed of the second drafting roller unit is lower than a drafting speed of the third drafting roller unit, and 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 clustering and drawing 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 comprises two drafting rollers which 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 by a first synchronous belt transmission; The second drafting roller unit comprises two drafting rollers which are parallel to each other and staggered in the vertical 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 comprises two drafting rollers which 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 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 bundling 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 stretching device comprises the geotextile spinning bundling and stretching device according to any one of claims 1 to 2, and also 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 punching machine, 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 of which 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 a plurality of spinnerets are arranged on the spinneret; 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 hole 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 a plurality of bundles, each bundle including a plurality of 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 a corresponding spindle position, 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 to form a web, the fiber web obtained by the swing wire machine is fed into the needling machine, the needling machine is used to needle the fiber web into geotextile, the waste edge cutting machine is used to cut off 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 off into a cloth roll.

4. The geotextile production line according to claim 3, characterized in that: The bottom of the silo is conical, the discharge port is arranged at the top of the cone, the raw material is 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 comprises 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, and the other end forms a molten raw material outlet.

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. A diverter is provided at the raw material inlet end of the spinning box, 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, and the diameter of the spinneret holes is 0.45 mm.

8. The geotextile production line according to claim 3, characterized in that: The cooling device includes an annular wind window. Several melt streams 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 18-24°C, and the temperature of the cooling air used to cool polypropylene fibers is 12°C.

9. A production process of geotextile, characterized in that: The geotextile production line according to claim 3 is adopted, and the production process comprises the following steps: S1: Add raw materials into the silo; S2: the raw materials in the silo enter the melt extruder, are heated and melted, and then the molten raw materials are output; S3: using the melt filter to remove impurities from the molten raw material; S4: spinning the filtered molten raw material through the spinning device in the spinning box, and the molten raw material is sprayed into a plurality of melt thin streams by the metering pump and the spinneret arranged at the outlet end of the metering pump; S5: cooling the plurality of melt streams by the cooling device to obtain a plurality of fiber filaments; S6: Gathering the plurality of fiber filaments into a bundle and sending the bundle to the geotextile spinning bundling and stretching device for mechanical bundling and stretching; S7: dividing the fiber bundle after the bundle drafting by the fiber dividing device into a plurality of bundles, each bundle including a plurality of fiber filaments, and the number of fiber filaments in each bundle is the same; S8: feeding each bundle of fiber filaments into a swing wire machine through the wire feeder for swing wire laying to obtain a fiber web; S9: needle-punching the fiber web into a geotextile by the needle-punching machine, and using the waste edge cutting machine to cut off the waste edges on both sides of the geotextile; S10: The geotextile with the waste edges cut off is rolled into a roll by a winding machine.

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