CN110815628A - Polymer melt disentanglement device - Google Patents
Polymer melt disentanglement device Download PDFInfo
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- CN110815628A CN110815628A CN201911109102.6A CN201911109102A CN110815628A CN 110815628 A CN110815628 A CN 110815628A CN 201911109102 A CN201911109102 A CN 201911109102A CN 110815628 A CN110815628 A CN 110815628A
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Images
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B9/00—Making granules
- B29B9/02—Making granules by dividing preformed material
- B29B9/06—Making granules by dividing preformed material in the form of filamentary material, e.g. combined with extrusion
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
- B29C48/395—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using screws surrounded by a cooperating barrel, e.g. single screw extruders
- B29C48/397—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using screws surrounded by a cooperating barrel, e.g. single screw extruders using a single screw
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
- B29C48/50—Details of extruders
- B29C48/505—Screws
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
- B29C48/50—Details of extruders
- B29C48/505—Screws
- B29C48/62—Screws characterised by the shape of the thread channel, e.g. U-shaped
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
- B29C48/50—Details of extruders
- B29C48/505—Screws
- B29C48/625—Screws characterised by the ratio of the threaded length of the screw to its outside diameter [L/D ratio]
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/92—Measuring, controlling or regulating
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92009—Measured parameter
- B29C2948/92019—Pressure
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92009—Measured parameter
- B29C2948/92085—Velocity
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92009—Measured parameter
- B29C2948/922—Viscosity; Melt flow index [MFI]; Molecular weight
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92009—Measured parameter
- B29C2948/92209—Temperature
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
Abstract
The invention discloses a driving motor, a disentangling mechanism and a forming port die which are sequentially connected in a polymer melt disentangling device, wherein the driving motor, the disentangling mechanism and the forming port die are fixedly supported by a supporting mechanism, an online detection mechanism is arranged on the disentangling mechanism and the forming port die, the supporting mechanism is fixedly connected to a base, one side of the middle rear part of the disentangling mechanism is externally connected with an outlet end of an extruder, and a control system is connected with the driving motor. The invention can make the molecular chain in the melt gradually move away under the circumferential shearing field or the circumferential vibration field, especially the composite stress field superposed by the circumferential shearing and the circumferential vibration, to achieve the high disentanglement effect, which not only can solve the problems of material warping deformation, poor weld mark strength and the like caused by high viscosity of the high polymer material, but also can greatly reduce the molding temperature under the condition of keeping the viscosity not to change much, thereby reducing the integral temperature difference and the internal stress of the product.
Description
Technical Field
The invention belongs to the technical field of high polymer material processing equipment, and particularly relates to a device capable of realizing disentanglement and continuous output of disentangled plastic melt in a polymer melt state.
Background
The polymer material becomes one of the most widely used important materials for modern human beings, and how to process the polymer material more in an energy-saving, environment-friendly, efficient and high-quality way has very important significance on the development of scientific technology and the improvement of economic level
It is known that, when the molecular weight is lower than the critical molecular weight Mc, the viscosity of the polymer melt is proportional to the relative molecular mass M, and when the relative molecular weight is higher than Mc, the polymer chains in a molten state are intertwined with each other to form an intertwined network, so that the movement capability of the molecular chains in the melt is limited, the viscosity of the polymer melt is proportional to the molecular mass M to the power of 3.4, the viscosity of the material is greatly increased, and the forming and processing process is not difficult. This makes it necessary, in general, to carry out both extrusion and injection molding of polymeric materials at relatively high pressures (injection molding melt pressures can be as high as 100MPa) and at relatively high melt temperatures (typically greater than 200 ℃), which, undoubtedly, results in considerable energy consumption. This problem is particularly acute when high viscosity materials are used to form large thin-walled articles. Theoretically, for a polymer with a specific molecular weight, if partial disentanglement or even complete disentanglement of a polymer chain can be realized in a melt state, the viscosity of the polymer melt can be remarkably reduced, and the processability of the polymer material is greatly improved. Compared with the traditional methods for improving the fluidity and the processability of the polymer by adding the plasticizer or reducing the molecular weight and the like, the method for reducing the viscosity and improving the processability by the disentanglement mode does not greatly influence the molecular weight of the polymer material, and further does not reduce the mechanical property of the final product.
Most of the existing mainstream melt processing devices (such as extrusion, injection molding and the like) can only provide a simple shear field, and the generated shear direction, shear rate and the like are not changed. This simple shear field can cause the molecular chains between the layers of the fluidized bed to slip in a direction perpendicular to the direction of flow, thereby releasing the entanglement points to some extent, causing a phenomenon of viscosity reduction, known as "shear thinning". Although the viscosity reduction caused by shear thinning is beneficial to the processing process, the shear rate is constant and the shear time is short, when the recovery entanglement caused by the thermal motion of the molecular chain and the shear-induced disentanglement reach the dynamic balance, the entanglement state of the molecular chain is kept unchanged, the disentanglement cannot be continued, and the viscosity is also kept unchanged. Therefore, the simple shear field disentanglement effect generated by the existing device is very limited, and efficient molecular chain disentanglement is not easy to realize, so that the processability of the polymer material cannot be greatly improved, and the energy consumption is reduced.
It is understood that no literature reports exist at present on how to further utilize the stress field to realize the high disentanglement of the polymer melt, and no device specially used for preparing the polymer melt disentanglement viscosity-reducing raw material on a large scale is available.
Disclosure of Invention
The invention aims to solve the blank of the prior art and provides a device capable of realizing the disentangling and viscosity reduction of polymer melt and continuously outputting disentangled melt.
The invention provides a polymer melt disentangling device which is characterized by comprising a driving motor, an disentangling mechanism, a forming port die, a fixing mechanism, an online detection mechanism, a supporting mechanism, a base and a control system which are sequentially connected, wherein the driving motor, the disentangling mechanism and the forming port die which are fixed by the fixing mechanism are fixedly supported by the supporting mechanism, the online detection mechanism is arranged on the disentangling mechanism and the forming port die, the supporting mechanism is fixedly connected to the base, one side of the middle rear part of the disentangling mechanism is externally connected with an outlet end of an extruder, and the control system is connected with the driving motor.
The disentanglement mechanism described in the above melt disentanglement apparatus comprises an disentanglement mandrel, a charging barrel, and a heating jacket. The disentangling mandrel is movably and fixedly connected through a fixing mechanism positioned outside the rear half section, so that a cantilever at the front half section is positioned in the charging barrel, the front half section of the mandrel is a smooth surface or a threaded surface uniformly provided with at least 2 threads in the same direction, each thread starts from the edge of an annular groove formed in the outer surface of the mandrel corresponding to a feeding port of the charging barrel, the lead angle of the thread is 45-85 degrees, the depth of a thread groove is 0.5-3 mm, and the rear end of the mandrel is connected with a driving motor through a coupler; the charging barrel is connected to the outside of the disentangling mandrel through a fixing mechanism outside the rear end head, a feeding hole is formed in one side of the barrel wall corresponding to the annular groove of the disentangling mandrel, the charging barrel is externally connected with the outlet end of an extruder through an extruder connector, the inner surface of the barrel wall behind the feeding hole is a smooth surface or is provided with at least 2 raised threads with the rotating directions opposite to the thread direction of the disentangling mandrel, and the lead angle of the threads and the depth of the thread groove are the same as those of the threads on the mandrel; the heating jacket is positioned outside the charging barrel.
The diameter D of the disentangling mandrel in the disentangling mechanism in the melt disentangling device is 15-60 mm, preferably 30-50 mm; the length-diameter ratio L/D is 10-30, preferably 15-20.
The number of the thread heads of the disentangling mandrel in the disentangling mechanism in the melt disentangling device is preferably 2-4.
The cross sections of the threads on the disentangling mandrel and the feed cylinder of the disentangling mechanism in the melt disentangling device are rectangular, saw-toothed or trapezoidal.
The disentanglement mechanism in the melt disentanglement device is arranged above, a viscosity testing cavity is reserved between the disentanglement mandrel front end head and the charging barrel end head, so that the viscometer can be conveniently inserted and placed, and interference of mandrel disturbance is avoided.
The fixing mechanism in the melt disentangling device is composed of a bearing, a bearing cover, a bearing seat and a bearing seat connecting flange. The bearing is arranged in the bearing seat, and the bearing cover and the bearing seat connecting flange are respectively arranged at two ends of the bearing seat and are fixedly connected into a whole through a connecting piece. The bearing seat is provided with a cooling water channel which is arranged on the seat body at one end connected with the connecting flange of the bearing seat and is an annular water tank which is not communicated, the notch is provided with a plug matched with the notch, and the middle section walls of the two blind ends of the annular water tank are respectively provided with a cooling water inlet and a cooling water outlet.
The on-line detection mechanism described in the above melt disentanglement apparatus includes a temperature sensor, a pressure sensor, and an on-line viscometer. The first temperature sensor and the second temperature sensor are respectively arranged on the cylinder wall behind the feed inlet of the charging barrel and the middle cylinder wall, the third temperature sensor is arranged on the cavity wall at one side of the front end head of the charging barrel, and the fourth temperature sensor is arranged on the forming die wall; the number of the pressure sensors is at least two, the first pressure sensor is arranged on the wall of the material barrel corresponding to the feeding hole, and the second pressure sensor is arranged on the wall of the forming hole die; the on-line viscometer is arranged on the cavity wall on the other side of the front end head of the charging barrel.
The supporting and fixing mechanism in the melt disentangling device at least comprises four plate-type supporting and fixing columns, wherein the first supporting and fixing column is fixed on the base through a connecting piece by a column base horizontally extending from one side of the bottom, and the second to the fourth supporting and fixing columns are fixed on the base through connecting pieces by column bases horizontally extending from two sides of the bottom. The first supporting and fixing column is positioned at the driving motor, the section of the column body is L-shaped, a reinforcing rib is arranged on one side of the L shape, a through hole is formed in the upper part of the L shape, an output shaft of the driving motor penetrates through the through hole and is connected with the disentangling mandrel through a coupler, and a connecting flange on the rear side of the output shaft is fixedly connected with the first supporting and fixing column through a connecting piece for supporting; the second to the fourth supporting and fixing columns are respectively positioned outside the fixing mechanism, outside the material cylinder in front of the feeding hole and outside the material cylinder at the front end of the disentangling mandrel in sequence, the fixed end of the upper half part of the supporting and fixing column consists of a semicircular notch and another semicircular fixing arc strip which are movably connected with the lower half part into a whole, and the two fixing ends are respectively connected by a connecting piece through horizontal wings which are provided with through holes and extend from the respective end edges of the two sides.
The control system in the melt disentangling device is a computer and a Programmable Logic Controller (PLC) arranged in the computer, namely, the control system can control a driving motor connected with the computer to perform circumferential rotation, circumferential vibration or composite motion of superposition of the circumferential rotation and the circumferential vibration through the following 4 parameters (calculation modes of the 4 parameters) input from the outside:
V1＝2f·θ+V
V2＝V-2f·θ
θ1＝(2f·θ+V)/2f
θ2＝(V-2f·θ)/2f
in the formula: v1 is the positive feed speed, in rad/s;
v2 is the reverse feed speed, in rad/s;
v is the rotation speed, the unit is r/min, and the selection is carried out according to different polymer types;
f is the vibration frequency in Hz, and is selected according to different polymer types;
theta is the vibration amplitude and is in the unit of DEG, and is selected according to different polymer types.
The values of V, f and θ for several commonly used materials can be selected within the ranges of the following table:
| material | V/r·min-1 | f/Hz | θ/° |
| Polyethylene (PE) | 5～40 | 5～10 | 10～30 |
| Polypropylene (PP) | 5～40 | 5～10 | 5～30 |
| Polycarbonate (PC) | 10～30 | 3～10 | 15～40 |
| Polystyrene (PS) | 10～30 | 3～10 | 5～30 |
A speed reducer may be further provided between the driving motor and the mandrel as described in the above melt disentangling device as necessary, which is common knowledge of those skilled in the art.
The forming neck ring mold in the melt disentangling device can be a neck ring mold for forming sheets, films or silk threads, and can be replaced according to the requirement; the molding neck ring is connected with the charging barrel through a machine head connecting flange.
When the device works, firstly, the heating jacket of the disentangling device and the cooling water of the bearing seat are opened, when the temperature rises to the melting temperature of the disentangling material, the driving motor is started, and the calculated parameter V is input through the computer touch display screen of the control system1、V2、θ1、θ2The Programmable Logic Controller (PLC) outputs a control command, the driving motor drives the connected disentangling mandrel to move according to the command, and then the plasticized plastic melt is input into the charging barrel through the extruder connector. The polymer melt is disentangled by the circumferential shearing and dragging action of the upper surfaces or spiral ribs of the barrel and the mandrel. And the disentangled melt passes through a forming die to form a product under the extrusion pressure of an extruder. The first temperature sensor, the second temperature sensor, the third temperature sensor and the fourth temperature sensor are arranged on the charging barrel, so that the temperature of the plastic in the charging barrel in a molten state can be monitored in real time, when the temperature is higher than the required temperature, the heating sleeve stops heating, and when the temperature is lower than the required temperature, the heating sleeve starts heating again. The first pressure sensor arranged at the feeding end and the second pressure sensor arranged at the discharging end of the charging barrel can monitor the pressure change in the extrusion process in real time. The online viscometer arranged at the discharge end of the charging barrel can monitor the viscosity change of the plastic melt in the disentanglement process in real time.
Compared with the prior art, the invention has the following beneficial effects:
1. the control system in the melt disentangling device provided by the invention can enable the disentangling mandrel to not only apply a circumferential rotation stress field or a circumferential vibration stress field or a composite motion stress field superposed by circumferential rotation and circumferential vibration to the melt entering the disentangling mandrel, but also amplify the effect of the stress field if the thread protruding from the disentangling mandrel is disturbed, so that molecular chains in the melt can gradually move away when the stress direction is continuously changed by relaxation in the circumferential shearing field or the circumferential vibration field, particularly in the composite stress field superposed by circumferential shearing and circumferential vibration, thereby achieving a high disentangling effect.
2. In the melt disentangling device provided by the invention, the threads of the disentangling mandrel are multi-start threads with equal depth, large lifting angle and shallow screw grooves, and the feed cylinder is also distributed with convex threads with the same angle and depth and opposite to the screw ridges on the mandrel, so that stronger stress action can be generated on the polymer melt, and the disentangling effect is further improved.
3. The melt disentangling device provided by the invention can not only enable the disentangling mandrel to generate a single circumferential rotation stress field or a single circumferential vibration stress field, but also simultaneously generate a composite stress field of circumferential rotation and circumferential vibration under the condition of adopting one driving motor, so that the overall size and the structural complexity of the whole device are smaller and the manufacturing cost can be reduced on the premise of ensuring and improving the disentangling effect.
4. The melt disentangling device provided by the invention is directly connected with the molding neck ring mold, so that not only can the disentangled polymer melt be directly extruded and molded to obtain various products, but also the melt is still in an disentangled state during extrusion molding and has lower viscosity and stronger movement capability of a molecular chain, so that the surface quality of the obtained molded product, such as surface roughness, transparency of an amorphous material and the like, can be improved, and the crystallinity and the mechanical property of the crystalline material can be expected to be improved to a certain degree.
5. The melt disentangling device provided by the invention can directly extrude and form threads to be granulated into granules, and the granules can retain the disentangled state in the melt and be used for secondary processing, so that on one hand, the melt disentangling device can show lower viscosity in the secondary processing, and various problems caused by high viscosity of a high polymer material, such as material warping deformation, poor weld mark strength and the like caused by large filling resistance and quick heat loss can be solved to a great extent. On the other hand, under the condition of keeping the viscosity not to change much, the disentangled granules can greatly reduce the forming temperature, so that the overall temperature difference of the product is reduced, and the internal stress is reduced.
6. The melt disentangling device provided by the invention is also provided with an online detection mechanism, so that the melt disentangling device can measure and accurately control parameters such as melt viscosity, shear rate, melt pressure, temperature and the like in real time, and indirectly know the disentangling effect through the melt viscosity so as to adjust in real time.
Drawings
FIG. 1 is a schematic view of the cross-sectional structure of the polymer melt disentanglement apparatus according to the present invention in a front view.
Fig. 2 is a schematic view of the top assembly structure of the polymer melt disentangling device provided by the invention.
Fig. 3 is a schematic sectional front view of a barrel of a polymer melt disentangling device provided in the present invention.
Fig. 4 is a schematic perspective side view of a bearing housing of the polymer melt disentangling device according to the present invention.
Fig. 5 is a front sectional view showing a bearing housing of the polymer melt disentangling device according to the present invention.
Fig. 6 is a schematic structural view of second to fourth supporting and fixing columns in the polymer melt disentangling device provided by the present invention.
Fig. 7 is a schematic view of a cross-sectional structure of a smooth-faced assembly of another disentangling mandrel of the polymer melt disentangling apparatus according to the present invention.
Fig. 8 is a schematic diagram of the movement of a driving motor in the polymer melt disentangling device provided by the invention. (1) Is a curve of angular velocity-time during circumferential vibration; (2) is an angular velocity-time curve during circumferential rotation; (3) and the curve of angular velocity-time is obtained when circumferential vibration and circumferential rotation are superposed.
Fig. 9 is a melt flow curve of a Polycarbonate (PC) material after treatment for various times using a polymer melt disentangling apparatus provided by the present invention.
FIG. 10 is a graph of complex viscosity versus oscillation frequency of low density polyethylene measured in a flat-plate rheometer after being processed for 5min under different motion conditions using the polymer melt disentangling apparatus provided by the present invention.
In fig. 1-7, 1 — drive motor; 2-a reducer; 3, coupling; 4-disentangling the mandrel; 5-thread; 6-an annular groove; 7-a barrel; 8-a feed inlet; 9-extruder connector; 10-heating jacket; 11-a bearing; 12-a bearing cap; 13-a bearing seat; 14-cooling water channels; 15-plug; 16-cooling water inlet; 17-a cooling water outlet; 18-bearing block connecting flange; 19-a first temperature sensor; 20-a second temperature sensor; 21-a third temperature sensor; 22-a fourth temperature sensor; 23-a first pressure sensor; 24-a second pressure sensor; 25-in-line viscometer; 26-a first supporting and fixing post; 27-reinforcing ribs; 28-a second support and fixing column; 29- -third support and fixation column; 30-fourth supporting and fixing column; 31-column base; 32-semicircular notch end; 33-semicircular fixed arc bars; 34-a base; 35-forming a die; 36-extruder.
Detailed Description
While the invention will be described in detail and with reference to the drawings and examples, it is to be understood that the following examples are illustrative of the invention and are not to be construed as limiting the scope of the invention, which is defined by the claims appended hereto.
Example 1
This example provides a polymer melt disentanglement apparatus, as shown in figures 1 and 2. The device specifically comprises a driving motor 1, a speed reducer 2, a disentangling mechanism, a forming mouth mold 35, a fixing mechanism, an online detection mechanism, a supporting mechanism, a base 34 and a control system which are connected in sequence. The sequentially connected driving motor 1, the disentangling mechanism and the forming die 35 which are fixed by the fixing mechanism are fixedly supported by the supporting mechanism, the online detecting mechanism is arranged on the disentangling mechanism and the forming die 35, the supporting mechanism is fixedly connected to the base 34, one side of the middle rear part of the disentangling mechanism is externally connected with the outlet end of the extruder, and the control system is connected with the driving motor 1.
Wherein the disentangling mechanism comprises an disentangling mandrel 4, a cartridge 7 and a heating jacket 10. The disentangling mandrel 4 is movably and fixedly connected with a fixing mechanism positioned outside the rear half section, so that the cantilever of the front half section is positioned in the charging barrel 7, the diameter D of the disentangling mandrel is 45mm, and the length-diameter ratio L/D of the disentangling mandrel is 15; the half section before this embodiment dabber 4 corresponds the flank of screw that the equipartition has 3 screw threads 5 for the syntropy, and every screw thread 5 all begins at the edge of the annular groove 6 of opening on the dabber 4 that feed inlet of feed cylinder 7 corresponds, and this annular groove 6 plays the cushioning effect to avoid the melting material to produce here and hold up the material. The lead angle of each thread 5 is 75 degrees, the depth of the thread groove is 3mm, and the cross section of each thread 5 is rectangular; the end links to each other with driving motor 1 through shaft coupling 3 behind the dabber, leaves viscosity test cavity between front end and the 7 ends of feed cylinder to in-line viscometer 25 is put in to the interpolation, avoid 4 disturbances of dabber to produce the interference to disentanglement material, influence the effect. The charging barrel 7 is connected outside the disentangling mandrel 4 through a fixing mechanism outside the rear end head, a feeding hole 8 is formed in one side of the barrel wall corresponding to the annular groove 6 of the disentangling mandrel 4, the feeding hole 8 is externally connected with an extruder 36 through an inverted T-shaped extruder connector 9 (shown in figure 2) with a through hole or in threaded connection or welded on the middle part, and the embodiment adopts threaded connection. The connector 9 and the extruder 36 are connected with an extrusion port of the extruder 36 through the other end part, and the polymer melt plasticized by the extruder 36 is input into the disentanglement mechanism through the feed port 8 under the action of extrusion pressure and is output through the forming die 35; 3 raised threads 5 with the rotation direction opposite to the thread direction of the disentangling mandrel are arranged on the inner surface of the cylinder wall, as shown in figure 3, and the lead angle of the threads and the depth of the thread groove on the inner surface are the same as those on the mandrel; the tail end of the charging barrel 7 is connected with a forming mouth mold 35 through a flange plate arranged at the end head; the heating jacket 10 is covered and positioned outside the charging barrel 7.
The fixing mechanism is composed of a bearing 11, a bearing cover 12, a bearing seat 13 and a bearing seat connecting flange 18. The bearing 11 is located in the bearing seat 13, and the bearing cover 12 and the bearing seat connecting flange 18 are respectively located at two ends of the bearing seat 13 and are fixedly connected into a whole through a connecting piece, and the tapered roller bearing is adopted in the embodiment, and the cooling water channel 14 is arranged in the bearing seat 13 for heat insulation. The disentangling mandrel 4 in the disentangling mechanism passes through the fixing mechanism and is supported and fixedly connected by the bearing block 13 in the fixing mechanism. The cooling water channel of the bearing seat of the present embodiment is formed on the seat body at the end connected with the bearing seat connecting flange 18, and is an annular water channel which is not through, the notch is provided with a plug 15 matched with the notch, and the middle section walls of the two blind ends of the annular water channel are respectively provided with a cooling water inlet and a cooling water outlet 16-17, as shown in fig. 4 and 5.
The online detection mechanism comprises a temperature sensor, a pressure sensor and an online viscometer. There are at least four temperature sensors, and four temperature sensors are provided in this embodiment. Wherein, the first and the second temperature sensors 19-20 are respectively arranged on the cylinder wall behind the feed inlet of the charging barrel 7 and the middle cylinder wall, the third temperature sensor 21 is arranged on the cavity wall at one side of the front end head of the charging barrel 7, and the fourth temperature sensor 22 is arranged on the molding die wall. The number of the pressure sensors is at least two, and the number of the pressure sensors is two in the embodiment. Wherein, the first pressure sensor 23 is arranged on the wall of the charging barrel 7 corresponding to the feeding hole 8, and the second pressure sensor 24 is arranged on the wall of the molding die 35; the in-line viscometer 25 is mounted on the cavity wall at the front end of the cartridge 7.
The supporting and fixing mechanism is at least composed of four plate-type supporting and fixing columns, and the number of the supporting and fixing mechanisms is four in the embodiment. The first supporting and fixing column 26 is fixed on the base 34 by the column base 31 extending horizontally from one side of the bottom through the connecting piece, and the second to fourth supporting and fixing columns 28-30 are fixed on the base 34 by the column base 31 extending horizontally from two sides of the bottom through the connecting piece. The first supporting and fixing column 26 is positioned at the driving motor 1, the section of the column body is L-shaped, a reinforcing rib 27 is arranged on one side of the L-shape, the upper part of the L-shape is provided with a through hole, the driving motor 1 penetrates through the through hole through an output shaft of the speed reducer 2 and is connected with the disentangling mandrel 4 through the coupling 3, and a connecting flange on the output shaft of the speed reducer 2 is fixedly connected with and supported by the first supporting and fixing column 26 through a connecting piece; the second to the fourth supporting and fixing columns 28 to 30 are respectively positioned outside the bearing seat 13, outside the charging barrel 7 in front of the feeding port 8 and outside the charging barrel at the front end of the disentangling mandrel 4 in sequence, the fixed end of the upper half part of the supporting and fixing column is composed of a semicircular notch end 32 connected with the lower half part into a whole and another semicircular fixing arc strip 33 which can be movably connected (see figure 6), and the supporting and fixing columns are respectively connected by connecting pieces through column seats 31 which are respectively extended by the end edges at both sides and are provided with through holes.
The control system is a computer and a Programmable Logic Controller (PLC) arranged in the computer, when in use, 4 parameters which are calculated by the following formula and are input from the outside can be used for programming and controlling a driving motor connected with the Programmable Logic Controller (PLC), so that a disentangling mandrel connected with the Programmable Logic Controller (PLC) acquires a required motion mode, and the compound motion of circumferential rotation, circumferential vibration or superposition of the circumferential rotation and the circumferential vibration is carried out:
V1＝2f·θ+V
V2＝V-2f·θ
θ1＝(2f·θ+V)/2f
θ2＝(V-2f·θ)/2f
in the formula: v1 is the positive feed speed, in rad/s;
v2 is the reverse feed speed, in rad/s;
v is the rotation speed, the unit is r/min, and the selection is carried out according to different polymer types;
f is the vibration frequency in Hz, and is selected according to different polymer types;
theta is the vibration amplitude and is in the unit of DEG, and is selected according to different polymer types.
The driving motor of the present embodiment adopts a servo motor, and the working principle of the servo motor is shown in fig. 8. When V is 0 and f · θ ≠ 0, the motion pattern is circumferential vibration, as shown in fig. 8 (1); when V ≠ 0 and f · θ is 0, the motion pattern is circumferential rotation, as shown in fig. 8 (2); when V, f and theta are both not zero, the motion mode is a compound motion of circumferential vibration and circumferential rotation, as shown in fig. 8 (3).
The molding die 35 may be a die for molding a sheet, a film or a filament, and may be replaced as necessary. The forming die 35 is connected with the charging barrel 7 through a machine head connecting flange.
Example 2
The polymer melt disentanglement apparatus of this example was constructed substantially the same as that of example 1 except that: both the disentangling mandrel 4 and the cartridge 7 are smooth-faced, as shown in fig. 7.
Example 3
The polymer melt disentanglement apparatus of this example was constructed substantially the same as that of example 1 except that: 1) the diameter D of the disentangling mandrel 4 is 30mm, the length-diameter ratio L/D is 18, the first half section is a thread surface which is uniformly distributed with 2 threads in the same direction, the lead angle of each thread is 85 degrees, the depth of a thread groove is 0.5mm, and the cross section of each thread is trapezoidal; 2) 2 threads 5 are correspondingly and uniformly distributed on the inner surface of the wall of the charging barrel 7 in the same direction, and the lead angle, the depth of the thread groove and the cross section shape of each thread are completely the same as those of the disentanglement mandrel 4.
Example 4
The polymer melt disentanglement apparatus of this example was constructed substantially the same as that of example 1 except that: the diameter D of the disentangling mandrel 4 is 50mm, the length-diameter ratio L/D is 20, the first half section is a thread surface which is uniformly distributed with 4 threads in the same direction, the lead angle of each thread is 50 degrees, the depth of a thread groove is 2mm, and the cross section of each thread is in a sawtooth shape; 2) 4 threads 5 are correspondingly and uniformly distributed on the inner surface of the wall of the charging barrel 7 in the same direction, and the lead angle of each thread, the depth of the thread groove and the cross section shape of the thread are completely the same as those of the disentanglement mandrel 4.
Application example 1
In this application example, the apparatus of example 1 is used, the cooling water of the heating jacket 10 and the bearing housing 13 is first turned on, the temperature is raised to 280 ℃ according to the Polycarbonate (PC) material to be processed, the driving motor 1 is turned on, and the processing parameters are selected as follows: the circumferential rotating speed V is 10r/min, the vibration frequency f is 5Hz, and the vibration amplitude theta is 30 degrees. The processing time is 10min and 20min respectively, and the parameter V is calculated according to the formula1、V2、θ1、θ2The numerical value of the polycarbonate melt is input into a control system through a computer touch display screen, a Programmable Logic Controller (PLC) outputs a control command, a driving motor 1 drives a connected disentangling mandrel 4 to perform composite motion of circumferential rotation and circumferential vibration superposition according to the command, then the plasticized polycarbonate melt is input into a charging barrel 7 through an extruder connector 9 by an extruder 36 to be disentangled, and the plasticized polycarbonate melt is extruded into strands by a forming die 35 to be cut into granules, cooled and dried.
Application example 2
The application example adopts the device of embodiment 2, the cooling water of the heating jacket 10 and the bearing seat 13 is firstly opened, the temperature is determined to rise to 160 ℃ according to the object to be processed being Low Density Polyethylene (LDPE) material, the driving motor 1 is started, and the processing parameters are selected: the circumferential rotating speed V is 20r/min, the vibration frequency f is 10Hz, and the vibration amplitude theta is 15 degrees. The processing time is 5min respectively, and the parameter V is calculated according to the formula1、V2、θ1、θ2The numerical value is input into the control system through a computer touch display screen, a Programmable Logic Controller (PLC) outputs a control command, and the driving motor 1 drives the connected disentanglement according to the commandThe mandrel 4 performs a composite motion of circumferential rotation and circumferential vibration superposition, and then the plasticized low-density polyethylene (LDPE) melt is input into the charging barrel 7 through the extruder connector 9 by the extruder 36 for disentanglement treatment, and is extruded out of a sheet by the forming die 35 and then is cooled and shaped by the water tank.
Application example 3
The present application example was completely the same as the application example 2 in terms of material, apparatus, temperature, and treatment time. The difference is that the parameters selected in the present application example are: the circumferential rotating speed V is 0r/min, the vibration frequency f is 10Hz, and the vibration amplitude theta is 15 degrees. The driving motor 1 drives the connected disentangling mandrel 4 to vibrate circumferentially according to instructions. Then, the plasticized low-density polyethylene melt is fed into the charging barrel 7 through the extruder connector 9 by the extruder 36 for disentanglement, and a sheet is extruded from the forming die 35 and then is cooled and shaped by a water tank.
Application example 4
The present application example was completely the same as the application example 2 in terms of material, apparatus, temperature, and treatment time. The difference is that the parameters selected in the present application example are: the circumferential rotating speed V is 20r/min, the vibration frequency f is 0Hz, and the vibration amplitude theta is 0 deg. The driving motor 1 drives the connected disentangling mandrel 4 to rotate circumferentially according to instructions. Then, the plasticized low-density polyethylene melt is fed into the charging barrel 7 through the extruder connector 9 by the extruder 36 for disentanglement, and a sheet is extruded from the forming die 35 and then is cooled and shaped by a water tank.
Application comparative example 1
The comparative example of this application was identical to the material, apparatus and temperature of application example 1. The difference lies in that: in this example, the driving motor 1 is turned off, and the disentangling mandrel 4 is in a stationary state, i.e., V ═ f ═ θ ═ 0. The polycarbonate melt plasticized by the extruder 36 enters the barrel 7 and is directly extruded through the forming die 35 without any disentanglement treatment to be pelletized, cooled and dried.
Comparative application example 2
The comparative application example is identical to the application example 2 in material, device and temperature. The difference lies in that: in this example, the driving motor 1 is turned off, and the disentangling mandrel 4 is in a stationary state, i.e., V ═ f ═ θ ═ 0. The low density polyethylene melt plasticized by the extruder 36 enters the charging barrel 7, is directly extruded into a sheet through the forming die 35 without any disentanglement treatment, and is cooled and shaped by the water tank.
To examine the technical effects of the disentanglement apparatus of the present invention, pellets obtained after the treatment of application example 1 and application comparative example 1 were first subjected to measurement of apparent viscosities at different shear rates using a high-pressure capillary rheometer and a melt flow curve was drawn, as shown in fig. 9. As can be seen from the graph of fig. 9, the apparent viscosity was greatly reduced compared to the material not treated by the present invention (0min), and the material obtained after treatment for 10min and 20min, and it can be clearly seen that the apparent viscosity became lower and the disentanglement effect was better as the treatment time was increased. The weight average molecular mass of the different samples was measured by Gel Permeation Chromatography (GPC) and is shown in the following table. The weight average molecular mass of the sample decreased with increasing treatment time, widening the molecular weight distribution, but the magnitude of the molecular weight decrease was not large enough to account for the decrease in viscosity. Thus, the present invention is shown to enable effective melt disentanglement without substantial reduction in molecular weight.
Next, the sheets obtained in application example 2, application example 3, application example 4, and application comparative example 2 were cut into circular sheets, and oscillation scanning was performed using a rotational rheometer to obtain a complex viscosity-oscillation frequency curve. As shown in fig. 10. The polymer melt in the application comparative example 2 shows the highest complex viscosity without any treatment, and the other three movement modes can reduce the complex viscosity of the melt, but compared with the simple circumferential rotation (application example 4) and circumferential vibration (application example 3), the disentanglement effect of the melt under the composite movement (application example 2) is the best, and the complex viscosity is the lowest. Therefore, the composite stress field formed by superimposing the circumferential vibration on the pure circumferential shear has better disentanglement effect than the pure circumferential shear field.
Claims (10)
1. The utility model provides a polymer fuse-element disentangles device, its characterized in that device is including driving motor (1) that connects gradually, the mechanism of disentangleing, shaping bush (35) and fixed establishment, on-line measuring mechanism, supporting mechanism, base (34) and control system, driving motor (1) that connects gradually, the mechanism of disentangleing fixed by fixed establishment and shaping bush (35) are by supporting mechanism fixed support, on-line measuring mechanism installs on the mechanism of disentangleing and shaping bush (35), supporting mechanism fixed connection is on base (34), the exit end of the external extruder (36) of rear portion one side in the mechanism of disentangleing, control system links to each other with driving motor (1).
2. The polymer melt disentangling device according to claim 1, wherein the disentangling mechanism in the device comprises an disentangling mandrel (4), a charging barrel (7) and a heating sleeve (10), the disentangling mandrel (4) is movably and fixedly connected through a fixing mechanism positioned outside the rear half section to enable a front half section cantilever to be positioned in the charging barrel (7), the front half section of the mandrel is a smooth surface or a threaded surface uniformly provided with at least 2 threads (5) in the same direction, each thread (5) starts from the edge of an annular groove (6) formed in the outer surface of the mandrel corresponding to a feeding port (8) of the charging barrel (7), the lead angle of the thread is 45-85 degrees, the depth of the threaded groove is 0.5-3 mm, and the rear end of the mandrel is connected with the driving motor (1) through a coupler (3); the charging barrel (7) is connected outside the disentangling mandrel (4) through a fixing mechanism outside the rear end head, a feeding hole (8) is formed in one side of the barrel wall corresponding to the annular groove (6) of the disentangling mandrel (4), the charging barrel is externally connected with the outlet end of an extruder (36) through an extruder connector (9), the inner surface of the barrel wall behind the feeding hole is a smooth surface or is provided with at least 2 raised threads (5) with the rotating directions opposite to the thread direction of the disentangling mandrel (4), and the lead angle of the threads and the depth of the thread groove are the same as those of the threads on the mandrel; the heating sleeve (10) is positioned outside the charging barrel (7).
3. The polymer melt disentanglement device according to claim 2, wherein the disentanglement mandrel (4) in the disentanglement mechanism in the device has a diameter D of 15 to 60mm and an aspect ratio L/D of 10 to 30; the number of the thread heads of the disentangling mandrel (4) is 2-4; the cross sections of the disentangling mandrel (4) and the threads (5) on the charging barrel (7) are rectangular, saw-toothed or trapezoidal.
4. A polymer melt disentanglement device according to claim 1, 2 or 3, wherein the fixing means of the device is formed by a bearing (11), a bearing cap (12), a bearing seat (13) and a bearing seat connecting flange (18), the bearing (11) is located in the bearing seat (13), the bearing cap (12) and the bearing seat connecting flange (18) are respectively located at two ends of the bearing seat (12) and are fixedly connected with the bearing seat (12) into a whole through a connecting piece, the bearing seat (12) is provided with a cooling water channel (14), the cooling water channel (14) is provided on a seat body connected with the bearing seat connecting flange (18) and is an annular water channel which is not penetrated, the notch is provided with a matched plug (15), and the middle section walls of two blind ends of the annular water channel are provided with cooling water inlet and outlet (16-17), respectively.
5. The polymer melt disentanglement apparatus according to claim 1, 2 or 3, wherein the on-line detection means in the apparatus comprises at least four temperature sensors, a pressure sensor and an on-line viscometer, the first and second temperature sensors (19 to 20) are installed in the rear wall and the middle wall of the feed port (8) of the cylinder (7), respectively, the third temperature sensor (21) is installed in the cavity wall on the side of the front end head of the cylinder (7), and the fourth temperature sensor (22) is installed in the die wall of the forming port; the number of the pressure sensors is at least two, the first pressure sensor (23) is arranged on the wall of the material barrel corresponding to the feeding hole (8), and the second pressure sensor (24) is arranged on the wall of the forming mouth mold (35); the online viscometer (25) is arranged on the cavity wall at the other side of the front end of the charging barrel (7).
6. The polymer melt disentanglement apparatus according to claim 4, wherein the in-line detection means of the apparatus comprises at least four temperature sensors, a pressure sensor and an in-line viscometer, the first and second temperature sensors (19 to 20) being installed in the rear wall and the middle wall of the feed port (8) of the barrel (7), respectively, the third temperature sensor (21) being installed in the cavity wall on the side of the front end head of the barrel (7), and the fourth temperature sensor being installed in the wall of the die of the forming port; the number of the pressure sensors is at least two, the first pressure sensor (23) is arranged on the wall of the material barrel corresponding to the feeding hole (8), and the second pressure sensor (24) is arranged on the wall of the forming mouth mold (35); the online viscometer (25) is arranged on the cavity wall at the other side of the front end of the charging barrel (7).
7. A polymer melt disentanglement device according to claim 1, 2 or 3, wherein the supporting/fixing means in the device is constituted by at least four plate-like supporting/fixing columns, the first supporting/fixing column (26) is fixed to the base (34) by a column base (31) extending horizontally from one side of the bottom via a connecting member, and the second to fourth supporting/fixing columns (28-30) are each fixed to the base (34) by a connecting member by a column base (31) extending horizontally from both sides of the respective bottom. The first supporting and fixing column (26) is positioned at the driving motor (1), the section of the column body is L-shaped, one side of the L-shape is provided with a reinforcing rib (27), the upper part of the L-shape is provided with a through hole, an output shaft of the driving motor (1) passes through the through hole and is connected with the disentangling mandrel (4) through the coupling (3), and a connecting flange at the rear side of the output shaft is fixedly connected and supported with the first supporting and fixing column (26) through a connecting piece; the second to the fourth supporting and fixing columns (28-30) are respectively positioned outside the fixing mechanism and outside the charging barrel (7) in front of the feeding hole (8) and outside the charging barrel (7) at the front end of the disentangling mandrel (4) in sequence, the fixed end of the upper half part of the supporting and fixing column is composed of a semicircular notch (32) which is connected with the lower half part into a whole and another semicircular fixing arc strip (33) which is movably connected, and the supporting and fixing columns are respectively connected by connecting pieces through column seats (31) which are provided with through holes and extend through the respective end edges of the two sides of.
8. The polymer melt disentanglement device according to claim 6, wherein the support fixing means is constituted by at least four plate-like support fixing columns, a first support fixing column (26) is fixed to the base (34) by a column base (31) extending horizontally from one side of the bottom through a connecting member, and second to fourth support fixing columns (28 to 30) are each fixed to the base (34) by a column base (31) extending horizontally from both sides of the bottom through a connecting member. The first supporting and fixing column (26) is positioned at the driving motor (1), the section of the column body is L-shaped, one side of the L-shape is provided with a reinforcing rib (27), the upper part of the L-shape is provided with a through hole, an output shaft of the driving motor (1) passes through the through hole and is connected with the disentangling mandrel (4) through the coupling (3), and a connecting flange at the rear side of the output shaft is fixedly connected and supported with the first supporting and fixing column (26) through a connecting piece; the second to the fourth supporting and fixing columns (28-30) are respectively positioned outside the fixing mechanism and outside the charging barrel (7) in front of the feeding hole (8) and outside the charging barrel (7) at the front end of the disentangling mandrel (4) in sequence, the fixed end of the upper half part of the supporting and fixing column is composed of a semicircular notch (32) which is connected with the lower half part into a whole and another semicircular fixing arc strip (33) which is movably connected, and the supporting and fixing columns are respectively connected by connecting pieces through column seats (31) which are provided with through holes and extend through the respective end edges of the two sides of.
9. The polymer melt disentanglement device according to claim 1, 2 or 3, wherein the control system is a computer and a programmable logic controller provided in the computer, and the drive motor connected thereto is controlled to perform the circumferential rotation, the circumferential vibration or the combined motion of the superposition of the circumferential rotation and the circumferential vibration by the following 4 parameters inputted from the outside:
V1＝2f·θ+V
V2＝V-2f·θ
θ1＝(2f·θ+V)/2f
θ2＝(V-2f·θ)/2f
in the formula: v1 is the positive feed speed, in rad/s;
v2 is the reverse feed speed, in rad/s;
theta 1 is a positive feeding angle and has unit of rad;
theta 2 is a reverse feeding angle, and the unit is rad;
v is the rotation speed, the unit is r/min, and the selection is carried out according to different polymer types;
f is the vibration frequency in Hz, and is selected according to different polymer types;
theta is the vibration amplitude and is in the unit of DEG, and is selected according to different polymer types.
10. The polymer melt disentanglement device according to claim 8, wherein the control system is a computer and a programmable logic controller provided in the computer, and the drive motor connected thereto is controlled to perform the circumferential rotation, the circumferential vibration or the combined motion of the circumferential rotation and the circumferential vibration in a superposition manner by the following 4 parameters inputted from the outside:
V1＝2f·θ+V
V2＝V-2f·θ
θ1＝(2f·θ+V)/2f
θ2＝(V-2f·θ)/2f
in the formula: v1 is the positive feed speed, in rad/s;
v2 is the reverse feed speed, in rad/s;
theta 1 is a positive feeding angle and has unit of rad;
theta 2 is a reverse feeding angle, and the unit is rad;
v is the rotation speed, the unit is r/min, and the selection is carried out according to different polymer types;
f is the vibration frequency in Hz, and is selected according to different polymer types;
theta is the vibration amplitude and is in the unit of DEG, and is selected according to different polymer types.
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