Spinning device special for finished silk

Abstract

The technical scheme of the utility model discloses a spinning device special for finished silk. The spinning device comprises a nascent silk preparation system and a stretching system, the stretching system comprises a tow unwinding frame, a first five-roller drawing machine, a second five-roller drawing machine, a constant-temperature water bath, a third five-roller drawing machine and a tow winding machine which are connected in sequence; and after being conveyed to the stretching system through the nascent filament preparation system, the nascent filaments are stretched into finished filaments with different specifications through the rotating speed difference among the first five-roller drawing machine, the second five-roller drawing machine and the third five-roller drawing machine. The PCL monofilament suture line prepared by the spinning device through a two-step method has the characteristics of good dimensional stability, high mechanical property, smooth surface and the like. The device is compact in equipment structure, small in occupied area and convenient to operate, and the whole process can be completed by one person; and spinning nozzles with different shapes can be selected to prepare monofilament fibers. In addition, by adjusting the rotating speed difference between the five-roller drawing machines, different types of fiber tows meeting different requirements can be obtained.

Description

Technical Field

[0001] This utility model relates to the field of spinning equipment technology, and in particular to a spinning device for finished yarn. Background Technology

[0002] Currently, melt-spinning materials are diverse, and a wide variety of resins can be processed, such as polycaprolactone (PCL). The requirements for melt-spinning processes on fiber filaments are varied. Existing experimental melt-spinning machines primarily aim to investigate the spinning properties of materials, explore process parameters, and provide effective data for the industrial production of melt-spinned materials. However, existing experimental melt-spinning machines often lack versatility, only capable of processing a limited number of materials or producing fiber bundles with a single state. Experiments often require multiple sets of different equipment to handle different types of fiber bundles, resulting in complex and inefficient operation.

[0003] Chinese patent CN203602772U discloses a "micro-scale melt spinning machine," comprising a pressurizing system, a spinning system, a feeding system, a cooling system, a stretching system, and a combined support. The spinning system is suspended and fixed by the combined support, the pressurizing system is positioned above the spinning system, the feeding system is positioned to the side of the spinning system, and the cooling system is positioned between the spinning system and the stretching system, fixed by the combined support. While this melt spinning machine uses a small amount of material and can be used for experimental production of continuous filaments, its limited capacity makes it suitable only for demonstration experiments. For experiments aimed at exploring process parameters and providing effective data for industrial melt spinning, it is difficult to simulate the continuous, large-scale spinning process in actual industrial production, thus making the obtained process parameters inaccurate. Furthermore, existing equipment often only adds a single cooling and drying device after the cooling water tank, resulting in insufficient drying of the fiber surface and internal moisture. This makes the fibers prone to hydrolysis, easily causing breakage in subsequent processes, affecting product quality and production efficiency. Utility Model Content

[0004] The technical problem solved by this invention is that traditional spinning equipment can only produce a small amount of continuous filaments with a simple structure, which cannot meet the needs of continuous mass spinning production, and the cooling and drying device cannot fully dry the moisture on the surface and inside of the fiber.

[0005] To solve the above-mentioned technical problems, the present invention provides a spinning device for finished yarn, comprising a nascent yarn preparation system for producing nascent yarn, wherein the nascent yarn preparation system is connected to a stretching system for processing the nascent yarn; the stretching system comprises a yarn feeding frame, a first five-roller drafting machine, a second five-roller drafting machine, a constant temperature water bath, a third five-roller drafting machine, and a finished yarn winding machine connected in sequence; after the nascent yarn is conveyed to the stretching system through the nascent yarn preparation system, it is stretched into finished yarns of different specifications by the speed difference between the first five-roller drafting machine, the second five-roller drafting machine, and the third five-roller drafting machine.

[0006] Optionally, the nascent filament preparation system includes a single-screw extruder, a cooling tank, a drying system, and a nascent filament winding machine connected in sequence.

[0007] Optionally, the single-screw extruder includes a hopper, a melt extruder, and a die connected in sequence.

[0008] Optionally, the single-screw extruder is further equipped with a metering pump, which is disposed between the melt extruder and the die.

[0009] Optionally, the nascent fiber preparation system also includes a nascent fiber diameter measuring instrument, which is connected to the nascent fiber winding machine.

[0010] Optionally, the stretching system also includes a finished yarn diameter gauge, which is connected to the finished yarn winding machine.

[0011] Optionally, the stretching system also includes an annular drying device connected between the finished yarn winding machine and the third five-roller stretching machine.

[0012] Optionally, the die head is a self-driving filament die head.

[0013] Optionally, the cooling tank has a guide system for guiding the nascent filaments.

[0014] Optionally, the roller surfaces of the first five-roll drawing machine, the second five-roll drawing machine, and the third five-roll drawing machine are mirror-finished with chrome plating.

[0015] The beneficial effects of this utility model's technical solution are:

[0016] This utility model relates to a spinning device specifically designed for finished yarn, which produces PCL monofilament sutures via a two-step process. The sutures exhibit excellent dimensional stability, high mechanical properties, and a smooth surface. The device is compact, requires little floor space, and is easy to operate; a single person can complete the entire process. Different spinneret shapes can be selected to produce monofilament fibers. Furthermore, by adjusting the speed difference between the five-roller drawing machines, fiber bundles of varying requirements and types can be obtained. An annular drying device connected to a high-power vacuum pump is also included, which facilitates more thorough drying of the sutures after cooling in the solution, preventing fiber breakage and ensuring product quality and production efficiency. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of the spinning device for finished yarn in an embodiment of this utility model.

[0018] In the attached diagram: 1. Hopper; 2. Melt extruder; 3. Die head; 4. Cooling tank; 5. Drying system; 6. Raw yarn winding machine; 7. Yarn unwinding frame; 8. First five-roll drawing machine; 9. Constant temperature water bath; 10. Finished yarn winding machine; 11. Annular drying device; 81. Second five-roll drawing machine; 82. Third five-roll drawing machine; 100. Raw yarn; 200. Finished yarn. Detailed implementation method:

[0019] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, but this is not intended to limit the present invention.

[0020] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0021] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0022] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0023] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0024] Example 1

[0025] Please see Figure 1 The diagram illustrates a spinning apparatus for finished yarn according to an embodiment. It includes a raw yarn preparation system for producing raw yarn 100, connected to a stretching system for processing the raw yarn. The stretching system comprises a yarn unwinding frame 7, a first five-roller drafting machine 8, a second five-roller drafting machine 81, a constant-temperature water bath 9, a third five-roller drafting machine 82, and a finished yarn winding machine 10, all connected in sequence. After the raw yarn 100 is conveyed to the stretching system via the raw yarn preparation system, it is stretched into finished yarns 200 of different specifications by the speed difference between the first five-roller drafting machine 8, the second five-roller drafting machine 81, and the third five-roller drafting machine 82.

[0026] In this embodiment, the nascent filament preparation system includes a single-screw extruder, a cooling tank 4, a drying system 5, and a nascent filament winding machine 6 connected in sequence.

[0027] In this embodiment, the single-screw extruder includes a hopper 1, a melt extruder 2, and a die 3 connected in sequence.

[0028] In this embodiment, a metering pump (not shown) is also installed in the single screw extruder, and the metering pump is located between the melt extruder 2 and the die 3.

[0029] In this embodiment, the nascent filament preparation system also includes a nascent filament diameter measuring instrument (not shown), which is connected to the nascent filament winding machine 6.

[0030] In this embodiment, the stretching system also includes a finished yarn diameter gauge (not shown), which is connected to the finished yarn winding machine 10.

[0031] In this embodiment, the stretching system also includes an annular drying device 11, which is connected between the finished yarn winding machine 10 and the third five-roll stretching machine 82. The annular drying device 11 is connected to an external high-power vacuum pump.

[0032] In this embodiment, the die head 3 is a self-jetting die head.

[0033] In this embodiment, the cooling tank 4 has a guide system (not shown) for guiding the nascent filaments.

[0034] In this embodiment, the roller surfaces of the first five-roll drawing machine 8, the second five-roll drawing machine 81, and the third five-roll drawing machine 82 are mirror-finished with chrome plating.

[0035] The following description will further illustrate the characteristics and functions of this utility model.

[0036] In this embodiment, the die 3 in the nascent filament preparation system can select a suitable spinneret orifice according to different suture specifications. The spinneret orifice sizes provided by this device are 1mm, 1.5mm, and 2mm. The single-screw extruder includes a barrel 1, a melt extruder 2, and a die 3. It is used to melt polymers or blends and to uniformly mix them using the shearing force of the screw.

[0037] Cooling tank 4 is equipped with a circulating cooling well system. The cooling tank is at least 120cm long and 60cm deep, and is equipped with guide rollers to keep the nascent filaments at a specific depth in the tank. The cooling well system should be sufficient to control the water temperature in the cooling tank at 3-5℃. It can be used to regulate the cooling water temperature to meet the cooling requirements of various polycaprolactone blends with different polymers.

[0038] The three five-roll drawing machines and the constant temperature water bath should be located on the same horizontal plane, aligned front to back, and spaced 30cm apart.

[0039] The constant temperature water bath is 80cm long and 40cm deep, and is equipped with guide rollers to keep the finished yarn at a specific depth in the water bath. The temperature of the constant temperature water bath is controlled between 40 and 55℃. At the same time, a ring drying device connected to a high-power vacuum pump is installed at the rear.

[0040] In this embodiment, the spinning apparatus controls the pressure and temperature of the spinning extrusion using CNC equipment, thereby controlling the diameter of the extruded fibers. The speed difference between the various traction rollers in the stretching system allows the fibers to form various types of fiber bundles as they pass through the rollers, resulting in threads of different diameters and specifications. A constant-temperature water bath anneales the fibers during the stretching process, promoting their orientation and crystallization.

[0041] The working principle of the spinning device in this embodiment is as follows:

[0042] Before melt spinning, the spinning apparatus in this embodiment requires heating all areas of the screw, metering pump, and die in the extrusion system to a preset temperature. Simultaneously, liquid water is injected into the cooling tank and the circulating water pump is turned on to lower the water temperature to a preset value. After the above steps are completed, resin granules are added to the barrel for spinning. The spun filament is wound in the winding system and then removed, placed on the subsequent stretching and unwinding frame. Based on the preset stretching ratio and stretching temperature, the filament is manually wound onto the rotating rollers, and stretching is achieved using different rotational speeds to finally obtain the finished filament.

[0043] In this embodiment, the screw temperature in each zone of the melt extruder 2 is set between 200℃ and 210℃. After the temperature stabilizes, 100g of PLA (polylactic acid fiber) and 100g of PCL (polycaprolactone) chips are poured into the hopper. Then, the PLA / PCL melt is ejected from the spinneret of the die 3 through the screw of the melt extruder 2 and enters the cooling system of the cooling tank 4, where the cooling temperature is set to 41℃. After cooling, the nascent filament 100 is wound on the nascent filament winding machine 6 and then manually wound onto the first five-roll drawing machine 8 and the second five-roll drawing machine 81. The drawing temperature is set to approximately 80-85℃, the rotation speed of the second five-roll drawing machine 81 is set to 50 rpm, and the rotation speed of the third five-roll drawing machine 82 is set to 60 rpm. Finally, a uniform and continuous PLA / PCL blend surgical suture is obtained and wound into the finished filament winding machine 10.

[0044] Example 2

[0045] In this embodiment, the melt spinning machine provided in Embodiment 1 is used for spinning. The process conditions are as follows: the preset temperature of each zone of the screw is between 100-120℃. After the temperature stabilizes, 200g of PCL chips are poured into the hopper, and then the PCL melt is ejected from the spinneret through the screw and enters the cooling system. The cooling temperature is set to 10℃. After cooling, the nascent filament is wound on the nascent filament winding machine and then manually wound onto the first five-roll drafting machine 8 and the second five-roll drafting machine 81. The speed of the first five-roll drafting machine 8 is set to 50 rpm, and the speed of the second five-roll drafting machine 81 is set to 250 rpm. The drafting temperature is then set to 40℃, and the speed of the third five-roll drafting machine 82 is set to 325 rpm. Finally, a uniform and continuous filament is obtained and wound into the finished filament winding machine 10.

[0046] Example 3

[0047] In this embodiment, the melt spinning machine provided in Example 1 is used for spinning. The process conditions are as follows: the preset temperature of each zone of the screw is between 290-320℃. After the temperature is constant, 140g of P4HB (poly(4-hydroxybutyrate)) and 60g of PLA blend chips are poured into the hopper. Then, the PCL / PLA blend melt is ejected from the spinneret through the screw and enters the cooling system. The cooling temperature is set to 50-60℃. After cooling, the nascent filament is wound on the nascent filament winding machine and then manually wound onto the second five-roll drawing machine 81 and the third five-roll drawing machine 82. The speed of the second five-roll drawing machine 81 is set to 50 rpm, and the speed of the third five-roll drawing machine 82 is set to 250 rpm. Finally, a uniform and continuous filament is obtained and wound into the finished filament winding machine 10.

[0048] In summary, this utility model's special spinning device for finished yarn produces PCL monofilament sutures through a two-step process, exhibiting excellent dimensional stability, high mechanical properties, and a smooth surface. The device boasts a compact structure, small footprint, and convenient operation, allowing a single person to complete the entire process. Different spinneret shapes can be selected to produce monofilament fibers. Furthermore, by adjusting the speed difference between the five-roller drawing machines, fiber bundles meeting various requirements and types can be obtained. The addition of a ring-shaped drying device connected to a high-power vacuum pump facilitates more thorough drying of the sutures after cooling in the solution, preventing fiber breakage and ensuring product quality and production efficiency.

[0049] The above are merely preferred embodiments of the present utility model and are not intended to limit the implementation methods and protection scope of the present utility model. Those skilled in the art should recognize that any equivalent substitutions and obvious changes made based on the description and illustrations of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A spinning device for a finished yarn, characterized in that The application relates to a primary filament production system for producing primary filaments, which is connected to a drawing system for processing the primary filaments; the drawing system comprises a yarn guide, a first five-roller drafting machine, a second five-roller drafting machine, a constant-temperature water bath tank, a third five-roller drafting machine and a finished filament winding machine which are connected in sequence; after the primary filaments are conveyed to the drawing system through the primary filament production system, the primary filaments are drawn into finished filaments of different specifications through the speed difference between the first five-roller drafting machine, the second five-roller drafting machine and the third five-roller drafting machine.

2. The finish yarn dedicated spinning device according to claim 1, wherein The primary filament production system comprises a single-screw extruder, a cooling tank, a drying system and a primary filament winding machine which are connected in sequence.

3. The finish yarn dedicated spinning device according to claim 2, wherein The single-screw extruder comprises a hopper, a melting extruder and a die head which are connected in sequence.

4. The finish yarn dedicated spinning device according to claim 3, wherein A metering pump is further arranged in the single-screw extruder, and the metering pump is arranged between the melting extruder and the die head.

5. The finish yarn dedicated spinning device according to claim 1, wherein The primary filament production system further comprises a primary filament diameter measuring instrument which is connected to the primary filament winding machine.

6. The finish yarn dedicated spinning device according to claim 1, wherein The drawing system further comprises a finished filament diameter measuring instrument which is connected to the finished filament winding machine.

7. The finish yarn dedicated spinning device according to claim 1, wherein The drawing system further comprises a ring-shaped drying device which is connected between the finished filament winding machine and the third five-roller drafting machine.

8. The finish yarn dedicated spinning device according to claim 4, wherein The die head is a self-blowing die head.

9. The finish yarn dedicated spinning device according to claim 2, wherein The cooling tank is provided with a yarn guide system for guiding the primary filaments.

10. The finish yarn dedicated spinning device according to claim 1, wherein The roller shaft surfaces of the first five-roller drafting machine, the second five-roller drafting machine and the third five-roller drafting machine are mirror-chromed.

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