A device for smoothing polytetrafluoroethylene filaments produced by a membrane splitting method

Abstract

The utility model provides a kind of even device for polytetrafluoroethylene filament produced by membrane crack method, it is related to material processing technical field, the even device includes: pressure leveling mechanism;Linear drive module, linear drive module is connected with the one of two pressure holding parts of pressure leveling mechanism;Two pressing plates, one pressing plate is connected with the output end of linear drive module, another pressing plate is connected with another pressure holding part, two pressing plates are used for passing through the polytetrafluoroethylene filament to be twisted and pressed between, linear drive module is set along the radial direction of polytetrafluoroethylene filament;Drafting mechanism, pressure leveling mechanism and drafting mechanism are set along the axial direction of polytetrafluoroethylene filament, drafting mechanism is used for passing through the polytetrafluoroethylene filament to be drafted;Two temperature control boxes, pressure leveling mechanism and drafting mechanism are respectively set in two temperature control boxes;The present application can improve the uniformity of polytetrafluoroethylene filament thickness, improve the quality and performance of polytetrafluoroethylene filament.

Description

Technical Field

[0001] This utility model belongs to the field of materials processing technology, and more specifically, relates to a homogenizing device for producing polytetrafluoroethylene filaments by membrane splitting method. Background Technology

[0002] Polytetrafluoroethylene (PTFE) possesses excellent chemical stability and resistance to chemical corrosion, as well as superior high and low temperature resistance. It exhibits low surface tension, flame retardancy, heat insulation, and excellent electrical insulation properties, making it widely used in corrosion protection, lubrication, high and low temperature resistance, and electrical insulation. There are three main types of PTFE raw materials: PTFE emulsions, PTFE suspension resins, and PTFE dispersion resins. PTFE dispersion resins can be used to process PTFE fiber products. PTFE fiber products retain the properties of PTFE while being soft and spun, allowing them to be processed into textiles for use in high-temperature flue gas filtration. Polytetrafluoroethylene (PTFE) dispersion resin is first mixed with an extrusion aid, then extruded and calendered, degreased, stretched and calendered, and then split into filaments. During the splitting process, the flattened PTFE needs to be cut into flat filaments by a cutter. Therefore, the PTFE filaments produced by the splitting method have a large uniformity deviation, are coarse, and have poor fineness uniformity. In the existing technology, there is no device to improve the large uniformity deviation, uneven fiber fineness, and coarseness in the PTFE production process by the splitting method. Utility Model Content

[0003] The purpose of this invention is to address the shortcomings of existing technologies by providing a uniformizing device for producing polytetrafluoroethylene (PTFE) filaments using the membrane splitting method, thereby solving the problems mentioned in the background art, such as large deviations in uniformity, coarse fibers, and poor uniformity in fineness of PTFE filaments produced by membrane splitting.

[0004] To achieve the above objectives, this utility model provides a leveling device for producing polytetrafluoroethylene filaments by membrane splitting, the leveling device comprising:

[0005] Pressure-adjusting mechanism;

[0006] A linear drive module, wherein the linear drive module is connected to one of the two pressing parts of the pressing mechanism;

[0007] Two pressure plates, one of which is connected to the output end of the linear drive module, and the other is connected to another holding part. The two pressure plates are used to pass through the polytetrafluoroethylene filament to be twisted. The linear drive module is arranged along the radial direction of the polytetrafluoroethylene filament.

[0008] The drawing mechanism, the pressing mechanism and the drawing mechanism are arranged along the axial direction of the polytetrafluoroethylene filament, and the drawing mechanism is used to pass through the polytetrafluoroethylene filament to be drawn;

[0009] Two temperature control boxes are arranged at an interval, and the pressing mechanism and the stretching mechanism are respectively arranged in the two temperature control boxes.

[0010] Preferably, the pressing and straightening mechanism includes:

[0011] The seat body, the top of which is another pressing part;

[0012] The elevator is located on one side of the seat, and the output end of the elevator is one of the holding parts.

[0013] Preferably, the drawing mechanism includes:

[0014] Two pairs of rollers are arranged along the axis of the polytetrafluoroethylene filament, and the two rollers in each pair are spaced apart.

[0015] Two rotary drive devices are connected to two pairs of rollers respectively, and each rotary drive device is used to drive the two rollers of a pair of rollers to rotate in opposite directions.

[0016] Preferably, the rotary drive device includes:

[0017] Two shafts, each of which is connected to one of the two rollers of a pair of rollers;

[0018] Two gears, each of which is connected to one of the two shafts, and the two gears mesh with each other.

[0019] A variable speed motor, the output end of which is connected to one of the shafts.

[0020] Preferably, the linear drive module is arranged along the radial direction of the polytetrafluoroethylene filament, and the linear drive module is a lead screw linear module.

[0021] Preferably, the leveling device for producing polytetrafluoroethylene filaments by the membrane splitting method further includes two guide seats, which are arranged along the axial direction of the polytetrafluoroethylene filaments. The pressing mechanism is arranged between the two guide seats. Each guide seat has a guide hole, and the interior of the guide hole is used for the polytetrafluoroethylene filaments to pass through.

[0022] Preferably, the homogenizing device for producing polytetrafluoroethylene filaments by the membrane splitting method further includes two temperature control units, which are electrically connected to two temperature control boxes respectively.

[0023] Preferably, the leveling device for producing polytetrafluoroethylene filaments by the membrane splitting method further includes:

[0024] A pressing and straightening control unit, which is electrically connected to the pressing and straightening mechanism;

[0025] A reciprocating motion control unit is electrically connected to the linear drive module.

[0026] Preferably, the leveling device for producing polytetrafluoroethylene filaments by the membrane splitting method further includes a speed control unit, which is electrically connected to the two rotary drive devices.

[0027] Preferably, the pressure plate is a metal pressure plate.

[0028] This utility model provides a leveling device for producing polytetrafluoroethylene filaments by membrane splitting. Its advantages are as follows: the pressing mechanism and the drawing mechanism of the leveling device are respectively set in two temperature control boxes. The temperature control boxes are appropriately adjusted according to the hardness of the actual material. If the hardness is too high, the temperature is appropriately increased to ensure that the polytetrafluoroethylene filaments are in a suitable temperature environment during the processing.

[0029] The pressing mechanism of the leveling device is equipped with two pressing plates in its two pressing parts. The distance between the two pressing plates can be determined according to the thickness of the flat filament prepared by the actual film cracking method, so that the thickness of the polytetrafluoroethylene filament reaches the required size. This precise gap adjustment can ensure that the thickness of the polytetrafluoroethylene filament is uniform and consistent, providing a good foundation for subsequent processing steps.

[0030] One of the pressure plates in the leveling device is connected to the output end of the linear drive module. The linear drive module is used to drive one of the pressure plates to reciprocate relative to the other pressure plate, which can realize twisting along the radial direction of the polytetrafluoroethylene filament and apply a certain pressure to the constrained polytetrafluoroethylene filament, so that the filament is uniform under the twisting action, eliminating the stress unevenness inside the polytetrafluoroethylene filament, reducing the linear density deviation rate, and improving the quality and performance of the polytetrafluoroethylene filament.

[0031] The drawing mechanism of this leveling device is located after the reciprocating motion of the pressure plate. The main function of the drawing mechanism is to improve the fineness of the polytetrafluoroethylene filament by using an appropriate drawing ratio, thereby improving the quality and performance of the polytetrafluoroethylene filament and improving the uniformity of the thickness of the polytetrafluoroethylene filament.

[0032] Other features and advantages of this invention will be described in detail in the following detailed description section. Attached Figure Description

[0033] The above and other objects, features and advantages of the present invention will become more apparent from the accompanying drawings, in which like reference numerals generally represent like parts.

[0034] Figure 1A schematic diagram of a leveling apparatus for producing polytetrafluoroethylene filaments by a membrane splitting method according to an embodiment of the present invention is shown.

[0035] Explanation of reference numerals in the attached figures:

[0036] 1. Pressure plate; 2. Polytetrafluoroethylene filament; 3. Temperature control box; 4. Roller; 5. Shaft; 6. Gear; 7. Lift; 8. Wire guide hole; 9. Temperature control unit; 10. Pressing and straightening control unit; 11. Reciprocating motion control unit; 12. Speed ​​control unit. Detailed Implementation

[0037] Preferred embodiments of the present invention will now be described in more detail. While preferred embodiments of the present invention are described below, it should be understood that the present invention can be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided to make the present invention more thorough and complete, and to fully convey the scope of the present invention to those skilled in the art.

[0038] like Figure 1 As shown, this utility model provides a leveling device for producing polytetrafluoroethylene filaments by membrane splitting, the leveling device comprising:

[0039] Pressure-adjusting mechanism;

[0040] A linear drive module is connected to one of the two pressing parts of the pressing mechanism;

[0041] Two pressure plates 1, one of which is connected to the output end of the linear drive module, and the other pressure plate 1 is connected to another pressing part. The two pressure plates 1 are used to pass through the polytetrafluoroethylene filament 2 to be twisted. The linear drive module is arranged along the radial direction of the polytetrafluoroethylene filament.

[0042] The drawing mechanism, the pressing mechanism and the drawing mechanism are arranged along the axial direction of the polytetrafluoroethylene filament 2. The drawing mechanism is used to pass through the polytetrafluoroethylene filament to be drawn.

[0043] Two temperature control boxes 3 are set apart, and the pressing mechanism and the stretching mechanism are respectively set in the two temperature control boxes 3.

[0044] Specifically, to address the issues of large uniformity deviation, coarse fibers, and poor fineness uniformity in polytetrafluoroethylene (PTFE) filaments produced by membrane splitting, this application provides a leveling device for producing PTFE filaments by membrane splitting. The leveling device's pressing mechanism and drawing mechanism are respectively located in two temperature control boxes 3. The temperature control boxes 3 are adjusted appropriately according to the actual hardness of the material. If the hardness is too high, the temperature is appropriately increased to ensure that the PTFE filaments 2 are in a suitable temperature environment during processing.

[0045] The pressing mechanism of the leveling device is equipped with two pressing plates 1 in each of the two pressing parts. The distance between the two pressing plates 1 can be determined according to the thickness of the flat filament prepared by the actual film cracking method, so that the thickness of the polytetrafluoroethylene filament 2 reaches the required size. This precise gap adjustment can ensure that the thickness of the polytetrafluoroethylene filament 2 is uniform and consistent, providing a good foundation for subsequent processing steps.

[0046] One of the pressure plates 1 in the leveling device is connected to the output end of the linear drive module. The linear drive module is used to drive one of the pressure plates 1 to reciprocate relative to the other pressure plate 1, which can realize twisting along the radial direction of the polytetrafluoroethylene filament 2 and give the constrained polytetrafluoroethylene filament 2 a certain pressure, so that the filament is uniform under the twisting action, eliminating the stress non-uniformity inside the polytetrafluoroethylene filament 2, reducing the linear density deviation rate, and improving the quality and performance of the polytetrafluoroethylene filament 2.

[0047] The drawing mechanism of the leveling device is set after the reciprocating motion of the pressure plate 1. The main function of the drawing mechanism is to improve the fineness of the polytetrafluoroethylene filament 2 by using an appropriate drawing ratio, thereby improving the quality and performance of the polytetrafluoroethylene filament 2 and improving the uniformity of the thickness of the polytetrafluoroethylene filament 2.

[0048] Preferably, the pressing and straightening mechanism includes:

[0049] The seat body, with another pressure-holding part at the top;

[0050] The elevator 7 is located on one side of the seat, and the output end of the elevator 7 is one of the holding parts.

[0051] Specifically, the elevator 7 can drive one of the pressure plates 1 to move closer to the other pressure plate 2. The distance between the two pressure plates 2 can be determined according to the thickness of the flat filament prepared by the actual film splitting method, so that the thickness of the polytetrafluoroethylene filament 3 reaches the required size.

[0052] Preferably, the drawing mechanism includes:

[0053] Two pairs of rollers 4 are arranged along the axis 2 of the polytetrafluoroethylene filament, and the two rollers 4 of each pair of rollers 4 are spaced apart.

[0054] Two rotary drive devices are connected to two pairs of rollers 4 respectively. Each rotary drive device is used to drive the two rollers 4 of a pair of rollers 4 to rotate in opposite directions.

[0055] Specifically, when the polytetrafluoroethylene filament 2, after being adjusted by the gap between the two pressure plates 1, enters the drawing mechanism, the rotation speeds of the two pairs of rollers 4 are adjusted appropriately to create different rotation speeds, thereby forming a draw ratio. This stretches the polytetrafluoroethylene filament 2 between the two pairs of rollers 4. The draw ratio is adjusted according to actual needs to improve the fineness of the filament. During the drawing process, the polytetrafluoroethylene filament 2 is stretched in a high-temperature environment, which further optimizes the molecular structure of the polytetrafluoroethylene filament 2, thereby improving the strength, toughness, and surface smoothness of the filament.

[0056] Preferably, the rotary drive device includes:

[0057] Two shafts 5 are connected to two rollers 4 of a pair of rollers 4 respectively;

[0058] Two gears 6 are connected to two shafts 5 respectively, and the two gears 6 are meshed together.

[0059] The variable speed motor has its output end connected to one of the shafts 5.

[0060] Specifically, the variable speed motor can change the rotational speed of the roller 4 to achieve the drawing of the polytetrafluoroethylene filament 2.

[0061] Preferably, the linear drive module is arranged along the radial direction of the polytetrafluoroethylene filament 2, and the linear drive module is a lead screw linear module.

[0062] Specifically, the linear screw module can drive one of the pressure plates 1 to reciprocate relative to the other pressure plate 1, which can achieve twisting along the radial direction of the polytetrafluoroethylene filament 2.

[0063] Preferably, the leveling device for producing polytetrafluoroethylene filaments by the membrane splitting method further includes two guide seats, which are arranged along the axial direction of the polytetrafluoroethylene filament 2. The pressing mechanism is arranged between the two guide seats. The guide seats are provided with guide holes 8, and the interior of the guide holes 8 is used for the polytetrafluoroethylene filament 2 to pass through.

[0064] Specifically, the guide hole 8 is used to guide the polytetrafluoroethylene filament 2.

[0065] Preferably, the leveling device for producing polytetrafluoroethylene filaments by the membrane splitting method further includes two temperature control units 9, which are electrically connected to two temperature control boxes 3 respectively.

[0066] Specifically, the temperature control unit 9 is used to control the temperature of the temperature control box, keeping the temperature of the temperature control box between 340℃ and 350℃. The temperature is adjusted appropriately according to the hardness of the actual material. If the hardness is too high, the temperature is increased appropriately. The temperature of the stretching part and the transverse movement part of the pressure plate are both controlled by the temperature control unit, and the ambient temperature of the two parts is kept consistent.

[0067] Preferably, the leveling device for producing polytetrafluoroethylene filaments by the membrane splitting method further includes:

[0068] The pressing and straightening control unit 10 is electrically connected to the pressing and straightening mechanism;

[0069] The reciprocating motion control unit 11 is electrically connected to the linear drive module.

[0070] Specifically, the pressure control unit 10 is used to control the lifting and lowering of the elevator 7 in order to control the gap between the two pressure plates 1. The gap can be determined according to the thickness of the flat wire prepared by the actual membrane splitting method. The adjustment principle is to be 0.001 mm smaller than the thickness of the flat wire prepared by the membrane splitting method.

[0071] The reciprocating motion control unit 11 is used to control the reciprocating motion of the linear drive module, wherein the reciprocating motion speed is controlled at 0.5 to 1 m / min, and the pressure of the pressure plate 1 is controlled at 0.01 MPa to 0.03 MPa.

[0072] Preferably, the leveling device for producing polytetrafluoroethylene filaments by the membrane splitting method further includes a speed control unit 12, which is electrically connected to two rotary drive devices.

[0073] Specifically, the speed control unit 12 is used to control the rotation of the two rotary drive devices, and improves the fineness of polytetrafluoroethylene filaments by adjusting the appropriate draw ratio according to actual needs.

[0074] Preferably, the pressure plate 1 is a metal pressure plate.

[0075] Example 1

[0076] Temperature control section

[0077] The temperature is controlled at 340℃, and adjusted appropriately according to the hardness of the actual material. If the hardness is too high, the temperature is increased appropriately. The temperature of the stretching part and the transverse movement part of the pressure plate are both controlled by the temperature control part, and the ambient temperature of the two parts is kept consistent.

[0078] Pressure plate gap adjustment section

[0079] The gap adjustment of the pressure plate is determined based on the actual thickness of the flat wire prepared by the membrane splitting method. The adjustment principle is to be 0.001 mm smaller than the thickness of the flat wire prepared by the membrane splitting method.

[0080] The reciprocating section of the pressure plate

[0081] The reciprocating section of the pressure plate consists of two parallel metal pressure plates that can reciprocate and apply pressure to the constrained membrane filaments. The reciprocating motion speed is controlled at 0.5 m / min, and the pressure of the pressure plates is controlled at 0.01 MPa.

[0082] Stretched portion

[0083] The drafting section is located after the pressing mechanism, and the fineness of the filament is improved by using an appropriate drafting ratio according to actual needs.

[0084] Example 2

[0085] Temperature control section

[0086] The temperature is controlled at 345℃, and adjusted appropriately according to the hardness of the actual material. If the hardness is too high, the temperature is increased appropriately. The temperature of the stretching part and the transverse movement part of the pressure plate are both controlled by the temperature control part, and the ambient temperature of the two parts is kept consistent.

[0087] Pressure plate gap adjustment section

[0088] The gap adjustment of the pressure plate is determined based on the actual thickness of the flat wire prepared by the membrane splitting method. The adjustment principle is to be 0.001 mm smaller than the thickness of the flat wire prepared by the membrane splitting method.

[0089] The reciprocating section of the pressure plate

[0090] The reciprocating section of the pressure plate consists of two parallel metal pressure plates that can reciprocate and apply pressure to the constrained membrane filaments. The reciprocating motion speed is controlled at 0.7 m / min, and the pressure of the pressure plates is controlled at 0.02 MPa.

[0091] Stretched portion

[0092] The drafting section is located after the pressing mechanism, and the fineness of the filament is improved by using an appropriate drafting ratio according to actual needs.

[0093] Example 3

[0094] Temperature control section

[0095] The temperature is controlled at 350℃, and adjusted appropriately according to the hardness of the actual material. If the hardness is too high, the temperature is increased appropriately. The temperature of the stretching part and the transverse movement part of the pressure plate are both controlled by the temperature control part, and the ambient temperature of the two parts is kept consistent.

[0096] Pressure plate gap adjustment section

[0097] The gap adjustment of the pressure plate is determined based on the actual thickness of the flat wire prepared by the membrane splitting method. The adjustment principle is to be 0.001 mm smaller than the thickness of the flat wire prepared by the membrane splitting method.

[0098] The reciprocating section of the pressure plate

[0099] The reciprocating section of the pressure plate consists of two parallel metal pressure plates that can reciprocate and apply pressure to the constrained membrane filaments. The reciprocating motion speed is controlled at 1 m / min, and the pressure of the pressure plates is controlled at 0.03 MPa.

[0100] Stretched portion

[0101] The drafting section is located after the pressing mechanism, and the fineness of the filament is improved by using an appropriate drafting ratio according to actual needs.

[0102]

[0103] In summary, when the uniformizing device for producing polytetrafluoroethylene (PTFE) filaments by the membrane splitting method of this application is implemented, the drawing mechanism is set after the pressing mechanism. When the PTFE filaments 2, after being adjusted by the gap between the two pressure plates 1, enter the drawing mechanism, the PTFE filaments are stretched by an appropriate drawing ratio. The size of the drawing ratio is adjusted according to actual needs to improve the fineness of the filaments. This application can reduce the linear density deviation rate and improve the uniformity of PTFE filaments produced by the membrane splitting method by about 50%. At the same time, this application has a simple structure, is easy to operate, and has low cost.

[0104] The various embodiments of the present invention have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments.

Claims

1. A leveling apparatus for producing polytetrafluoroethylene filaments by membrane splitting, characterized in that, The leveling device includes: Pressure-adjusting mechanism; A linear drive module, wherein the linear drive module is connected to one of the two pressing parts of the pressing mechanism; Two pressure plates, one of which is connected to the output end of the linear drive module, and the other is connected to another holding part. The two pressure plates are used to pass through the polytetrafluoroethylene filament to be twisted. The linear drive module is arranged along the radial direction of the polytetrafluoroethylene filament. The drawing mechanism, the pressing mechanism and the drawing mechanism are arranged along the axial direction of the polytetrafluoroethylene filament, and the drawing mechanism is used to pass through the polytetrafluoroethylene filament to be drawn; Two temperature control boxes are arranged at an interval, and the pressing mechanism and the stretching mechanism are respectively arranged in the two temperature control boxes.

2. The leveling apparatus for producing polytetrafluoroethylene filaments by membrane splitting according to claim 1, characterized in that, The pressing and straightening mechanism includes: The seat body, the top of which is another pressing part; The elevator is located on one side of the seat, and the output end of the elevator is one of the holding parts.

3. The leveling apparatus for producing polytetrafluoroethylene filaments by membrane splitting according to claim 1, characterized in that, The stretching mechanism includes: Two pairs of rollers are arranged along the axis of the polytetrafluoroethylene filament, and the two rollers in each pair are spaced apart. Two rotary drive devices are connected to two pairs of rollers respectively, and each rotary drive device is used to drive the two rollers of a pair of rollers to rotate in opposite directions.

4. The leveling device for producing polytetrafluoroethylene filaments by membrane splitting according to claim 3, characterized in that, The rotary drive device includes: Two shafts, each of which is connected to one of the two rollers of a pair of rollers; Two gears, each of which is connected to one of the two shafts, and the two gears mesh together. A variable speed motor, the output end of which is connected to one of the shafts.

5. The leveling apparatus for producing polytetrafluoroethylene filaments by membrane splitting according to claim 1, characterized in that, The linear drive module is arranged along the radial direction of the polytetrafluoroethylene filament, and the linear drive module is a lead screw linear module.

6. The leveling apparatus for producing polytetrafluoroethylene filaments by membrane splitting according to claim 1, characterized in that, The leveling device for producing polytetrafluoroethylene filaments by the membrane splitting method further includes two guide seats, which are arranged along the axial direction of the polytetrafluoroethylene filaments. The pressing mechanism is arranged between the two guide seats. Each guide seat has a guide hole, and the interior of the guide hole is used for the polytetrafluoroethylene filaments to pass through.

7. The leveling apparatus for producing polytetrafluoroethylene filaments by membrane splitting according to claim 1, characterized in that, The homogenizing device for producing polytetrafluoroethylene filaments by the membrane splitting method also includes two temperature control units, which are electrically connected to two temperature control boxes respectively.

8. The leveling apparatus for producing polytetrafluoroethylene filaments by membrane splitting according to claim 1, characterized in that, The leveling device for producing polytetrafluoroethylene filaments by the membrane splitting method also includes: A pressing and straightening control unit, which is electrically connected to the pressing and straightening mechanism; A reciprocating motion control unit is electrically connected to the linear drive module.

9. A leveling apparatus for producing polytetrafluoroethylene filaments by membrane splitting according to claim 3, characterized in that, The leveling device for producing polytetrafluoroethylene filaments by the membrane splitting method also includes a speed control unit, which is electrically connected to the two rotary drive devices.

10. A leveling apparatus for producing polytetrafluoroethylene filaments by membrane splitting according to claim 1, characterized in that, The pressure plate is a metal pressure plate.

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