CN210916353U - Constant-pressure feeding system for dope dyeing - Google Patents
Constant-pressure feeding system for dope dyeing Download PDFInfo
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- CN210916353U CN210916353U CN201921810253.XU CN201921810253U CN210916353U CN 210916353 U CN210916353 U CN 210916353U CN 201921810253 U CN201921810253 U CN 201921810253U CN 210916353 U CN210916353 U CN 210916353U
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Abstract
The utility model relates to a dope dyeing technical field especially relates to a constant voltage charge-in system is used in dope dyeing. The utility model provides a constant pressure feeding system for dope dyeing, which is characterized in that the top of a main material bin is communicated with the top of a color master batch bin by arranging a first gas pipeline; when injecting inert gas into the inside of first gas line through the gaseous branch road of second, because main material feed bin and masterbatch feed bin are in the connected state, consequently, can guarantee that the pressure of main material feed bin and masterbatch feed bin keeps synchronous constantly, so, even the condition of emergence pressure oscillation, the pressure of main material feed bin and masterbatch feed bin also can realize the synchro-variation, the ratio of the unloading speed of main material section unloading unit and masterbatch section unloading unit can keep invariable, thereby realize the homogeneous of the masterbatch concentration in the mixed ejection of compact, and then make the colored fiber product color and luster of production even, the quality of colored fiber product has been improved.
Description
Technical Field
The utility model relates to a dope dyeing technical field especially relates to a constant voltage charge-in system is used in dope dyeing.
Background
The dope dyeing is a production process for preparing colored fibers by adding color master batches in the spinning process. The color master batch chip and the main material chip (polyester fiber chip) are uniformly mixed and then are subjected to melt spinning forming, so that the color fastness of the prepared colored fiber finished product is relatively high. Compared with the traditional process of dyeing after spinning, the process of dyeing after spinning has the obvious advantages of short process flow, low energy consumption, economy and environmental protection; the colored fiber product prepared by the dope dyeing has high color fastness and small batch difference.
In the prior art, a feeding system for dope dyeing generally comprises a main material slice blanking unit, a color master batch slice blanking unit and a mixing unit, wherein the main material slice and the color master batch slice are respectively blanked from respective storage bins at a preset speed and then fully mixed in the mixing unit. Therefore, the feeding system for the spinning dyeing needs to coordinate the feeding speed of the main material slice feeding unit and the masterbatch slice feeding unit so as to ensure that the proportion of the main material slice and the masterbatch slice in the mixing unit is kept constant at any time, thereby realizing the uniformity of the concentration of the masterbatch in mixed discharging and further ensuring the uniform color of the produced colored fiber product. However, in the blanking process, the ratio of the blanking speed of the main material chip blanking unit to the masterbatch chip blanking unit may change due to pressure fluctuation, so as to cause the concentration of the masterbatch in the mixed material to change, and further cause the color of the produced colored fiber product to have dark or light color difference, thereby seriously affecting the quality of the colored fiber product.
SUMMERY OF THE UTILITY MODEL
In the process of blanking by adopting the feeding system for dope dyeing in the prior art, the ratio of the blanking speed of the main material section blanking unit and the masterbatch section blanking unit is possibly changed due to pressure fluctuation, so that the concentration of the masterbatch in mixed discharging is changed, the color of the produced colored fiber product is changed or the color difference is dark or light, and the quality of the colored fiber product is seriously influenced. In order to solve the technical problem, the utility model provides a technical scheme does:
the utility model provides a constant pressure feeding system for dope dyeing, which is arranged along the vertical direction; the constant-pressure feeding system for the dope dyeing comprises a main material slice blanking unit, a color master batch slice blanking unit and a mixing unit; the main material slice blanking unit and the color master batch slice blanking unit are both positioned above the mixing unit and are respectively communicated with the mixing unit; the main material slicing and blanking unit comprises a main material bin; the main material bin is positioned at the top of the main material slicing and blanking unit; the color master batch slice blanking unit comprises a color master batch bin; the color master batch bin is positioned at the top of the color master batch slice blanking unit; the top of the main material bin is communicated with the top of the color master batch bin through a first gas pipeline; a second gas branch is arranged on the first gas pipeline; one end of the second gas branch is communicated with the first gas pipeline, and the other end of the second gas branch is communicated with an inert gas source.
The utility model provides a constant voltage feed system for dope dyeing, preferably, masterbatch section unloading unit includes masterbatch feed bin, valve, first intermediate charging bucket and masterbatch discharging pipe that from top to bottom communicate in proper order; and the intermediate material tank is filled with the color master batch slices.
The utility model provides a constant pressure feed system for dope dyeing, preferably, the upper side wall of the middle charging bucket is provided with a gas injection opening of the middle charging bucket; a third gas branch is also arranged on the first gas pipeline; one end of the third gas branch is communicated with the first gas pipeline, and the other end of the third gas branch is communicated with the intermediate charging bucket through the gas injection port of the intermediate charging bucket.
The utility model provides a constant voltage feed system for dope dyeing, preferably, constant voltage feed system for dope dyeing still includes spinning screw extruder; the feed inlet of the spinning screw extruder is a screw feed inlet; the spinning screw extruder is positioned below the mixing unit, and the screw feeding hole is over against the discharging hole of the mixing unit; the spinning screw extruder is communicated with the mixing unit through the screw feeding hole; and a gas discharge port is formed in the bottom of the screw feeding port.
The utility model provides a constant voltage feed system for dope dyeing, preferably, masterbatch section unloading unit still includes the masterbatch metering mechanism who is used for controlling the unloading speed of masterbatch section; the masterbatch metering mechanism is arranged on the masterbatch discharging pipe.
The utility model provides a constant voltage feed system for dope dyeing, preferably, the major ingredient section unloading unit includes major ingredient feed bin and major ingredient discharging pipe that from top to bottom communicates in proper order; the main material slice blanking unit also comprises a main material metering mechanism for controlling the discharging speed of the main material slices; the main material metering mechanism is arranged on the main material discharge pipe.
The utility model provides a constant voltage feed system for dope dyeing, preferably, the mixing unit specifically is three-way type pipeline mixer; two of the passage openings of the three-way type pipeline mixer are respectively communicated with the main material slice blanking unit and the master batch slice blanking unit, and the rest passage opening of the three-way type pipeline mixer is vertically arranged downwards.
The utility model has the advantages of or beneficial effect:
the utility model provides a constant pressure feeding system for dope dyeing, which is characterized in that the top of a main material bin is communicated with the top of a color master batch bin by arranging a first gas pipeline; when injecting inert gas into the inside of first gas line through the gaseous branch road of second, because main material feed bin and masterbatch feed bin are in the connected state, consequently, can guarantee that the pressure of main material feed bin and masterbatch feed bin keeps synchronous constantly, so, even the condition of emergence pressure oscillation, the pressure of main material feed bin and masterbatch feed bin also can realize the synchro-variation, the ratio of the unloading speed of main material section unloading unit and masterbatch section unloading unit can keep invariable, thereby realize the homogeneous of the masterbatch concentration in the mixed ejection of compact, and then make the colored fiber product color and luster of production even, the quality of colored fiber product has been improved.
Drawings
The invention and its features, aspects and advantages will become more apparent from a reading of the following detailed description of non-limiting embodiments with reference to the attached drawings. Like reference symbols in the various drawings indicate like elements. The drawings are not intended to be drawn to scale, emphasis instead being placed upon illustrating the principles of the invention.
FIG. 1 is a schematic structural view of a constant pressure feed system for dope dyeing according to example 1 of the present invention;
fig. 2 is a schematic structural view of a constant pressure feed system for dope dyeing according to example 2 of the present invention.
Detailed Description
In the following, the technical solutions in the embodiments of the present invention are clearly and completely described with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative efforts belong to the protection scope of the present invention.
Example 1
In the prior art, a feeding system for dope dyeing generally comprises a main material slice blanking unit, a color master batch slice blanking unit and a mixing unit, wherein the main material slice and the color master batch slice are respectively blanked from respective storage bins at a preset speed and then fully mixed in the mixing unit. Therefore, the feeding system for the spinning dyeing needs to coordinate the feeding speed of the main material slice feeding unit and the masterbatch slice feeding unit so as to ensure that the proportion of the main material slice and the masterbatch slice in the mixing unit is kept constant at any time, thereby realizing the uniformity of the concentration of the masterbatch in mixed discharging and further ensuring the uniform color of the produced colored fiber product. However, in the blanking process, the ratio of the blanking speed of the main material chip blanking unit to the masterbatch chip blanking unit may change due to pressure fluctuation, so as to cause the concentration of the masterbatch in the mixed material to change, and further cause the color of the produced colored fiber product to have dark or light color difference, thereby seriously affecting the quality of the colored fiber product.
In the process of blanking by adopting the feeding system for dope dyeing in the prior art, the ratio of the blanking speed of the main material section blanking unit and the masterbatch section blanking unit is possibly changed due to pressure fluctuation, so that the concentration of the masterbatch in mixed discharging is changed, the color of the produced colored fiber product is changed or the color difference is dark or light, and the quality of the colored fiber product is seriously influenced. In order to solve the above technical problems, the present embodiment provides a constant pressure feeding system for dope dyeing, as shown in fig. 1, the constant pressure feeding system for dope dyeing is disposed along a vertical direction; the constant-pressure feeding system for the dope dyeing comprises a main material slice blanking unit 1, a color master batch slice blanking unit 2 and a mixing unit 3; the main material slice blanking unit 1 and the color master batch slice blanking unit 2 are both positioned above the mixing unit 3, and the main material slice blanking unit 1 and the color master batch slice blanking unit 2 are respectively communicated with the mixing unit 3; the main material slicing and blanking unit 1 comprises a main material bin 11; the main material bin 11 is positioned at the top of the main material slicing and blanking unit 1; the color master batch slice blanking unit 2 comprises a color master batch bin 21; the color master batch bin 21 is positioned at the top of the color master batch slice blanking unit 2; the top of the main material bin 11 is communicated with the top of the color master batch bin 21 through a first gas pipeline 01; a second gas branch 02 is arranged on the first gas pipeline 01; one end of the second gas branch 02 is communicated with the first gas pipeline 01, and the other end of the second gas branch 02 is communicated with an inert gas source.
The main material slice blanking unit 1 is used for conveying the main material slices from the main material bin 11 to the mixing unit 3 at a certain blanking speed. The color master batch blanking unit 2 is used for conveying color master batch slices from the color master batch bin 21 to the mixing unit 3 at a certain blanking speed. The mixing unit 3 is used for mixing the main material slices and the color master batch slices, and the color master batch concentration of the mixture of the main material slices and the color master batch slices flowing out through the mixing unit 3 is kept basically constant.
When the constant pressure feeding system for dope dyeing of example 1 is used for feeding, a sufficient amount of master batch chips are first added to the master batch silo 11, and a sufficient amount of master batch chips are added to the master batch silo 21. Then, the inert gas (for example, nitrogen, which does not adversely affect the subsequent production process) is filled into the second gas branch 02 from the inert gas source according to the direction shown in the figure, so as to keep the internal pressures of the main material bin and the color masterbatch bin at 0.02kg/cm2. Different blanking speeds are set, and the blanking speed of the main material slices is made to be as follows: the ratio of the blanking speed of the color master batch chip is kept constant. The master batch slices and the masterbatch slices falling into the mixing unit 3 through the master batch slice blanking unit 1 and the masterbatch slice blanking unit 2 are fully mixed, and then flow out to the subsequent working section through the mixing unit 3.
In the feed bin (main material feed bin 11/masterbatch feed bin 21), due to the action of gravity, the slices (main material slices/masterbatch slices) are mainly concentrated at the bottom of the feed bin, and inert gas is injected from the top of the feed bin, so that downward pressure can be generated on the slices below, and smooth downward blanking of the slices is facilitated.
In the constant-pressure feeding system for dope dyeing provided by this embodiment, the top of the main material bin 11 is communicated with the top of the color masterbatch bin 21 by arranging the first gas pipeline 01; when injecting inert gas to the inside of first gas line 01 through second gas branch 02, because major ingredient feed bin 11 and masterbatch feed bin 21 are in the connected state, consequently, can guarantee that major ingredient feed bin 11 keeps synchronous constantly with the pressure of masterbatch feed bin 21, so, even the condition of pressure oscillation takes place, major ingredient feed bin 11 also can realize the synchro variation with masterbatch feed bin 21's pressure, the ratio of the unloading speed of major ingredient section unloading unit 1 and masterbatch section unloading unit 2 can keep invariable, thereby realize the homogeneous of the masterbatch concentration in the mixed ejection of compact, and then make the colored fiber product color and luster of production even, the quality of colored fiber product has been improved.
Because the sliced quality of masterbatch is less, in order to guarantee that the masterbatch can ejection of compact smoothly, masterbatch section unloading unit 2 is usually through applying certain atmospheric pressure in the top of masterbatch feed bin 21, through atmospheric pressure and the sliced self action of gravity of masterbatch to realize the sliced smooth ejection of compact of masterbatch. However, in practical production, in order to meet the requirement of mass production, the volume of the color master batch bin 21 is generally large, so as to avoid frequent replenishment of the color master batch bin 21 during the production process. With the continuous progress of production, the masterbatch section stock in the masterbatch feed bin 21 reduces gradually, and although the top of masterbatch feed bin 21 has set up invariable atmospheric pressure, nevertheless, along with the gradual reduction of masterbatch section occupation space, the gaseous volume in masterbatch feed bin 21 increases gradually, consequently, the actual pressure of the inside of masterbatch feed bin 21 is less than the settlement pressure, and during gaseous the replenishment, there is certain fluctuation in the atmospheric pressure of masterbatch feed bin 21. The air pressure fluctuation of the color master batch bin 21 directly affects the discharge amount of the color master batches, so that the color degree of the produced colored fibers is possibly uneven.
In order to reduce the occurrence of uneven color of the color fiber caused by the air pressure fluctuation of the color masterbatch bin 21, in the constant pressure feeding system for spinning dyeing provided in this embodiment, preferably, as shown in fig. 1, the color masterbatch slice blanking unit 2 includes the color masterbatch bin 21, a valve 22, a first intermediate tank 23 and a color masterbatch discharging pipe 24, which are sequentially communicated from top to bottom; the intermediate charging bucket 23 is filled with the color master batch slices.
When the constant-pressure feeding system for dope dyeing according to the preferred embodiment is used for blanking the masterbatch chips for dope dyeing, sufficient masterbatch chips are added into the masterbatch bin 21, so that the masterbatch chips are filled in the intermediate tank 23. Then, the top of the color masterbatch bin 21 is closed, and the inert gas is continuously introduced into the first gas line 01, so that the pressure in the color masterbatch bin 21 is kept constant. The masterbatch slice moves downwards under the driving of self gravity and air pressure and enters the mixing unit 3 along the masterbatch discharging pipe 24.
The constant pressure feeding system for dope dyeing provided by the preferred embodiment is characterized in that an intermediate charging bucket 23 is connected in series below the color master batch bin 21. Because the volume of the intermediate charging bucket 23 is smaller, the masterbatch slices in the intermediate charging bucket 23 are always in a full-bin state in the process of masterbatch slice blanking. The intermediate bucket 23 is in a full state, which also means that the void ratio in the intermediate bucket 23 is kept constant, so that the influence of the fluctuation of the air pressure on the intermediate bucket 23 is very limited. Adopt the constant voltage charge-in system for dope dyeing that this embodiment provided, the middle charging bucket 23 of full storehouse, keep apart the masterbatch feed bin 21 and the masterbatch discharging pipe 24 of top, avoided masterbatch feed bin 21's atmospheric pressure fluctuation to produce the influence to the sliced load (discharge speed) of masterbatch, avoid because the inhomogeneous condition of color and luster takes place appears in the colored fibre that the atmospheric pressure fluctuation of masterbatch feed bin 21 leads to, be favorable to improving the color and luster degree of consistency of colored fibre product and further improve the quality of colored fibre product.
Example 2
In order to further reduce the influence of pressure fluctuation on the blanking speed of the color master batch chips based on the embodiment 1, the constant-pressure feeding system for dope dyeing provided in the embodiment 2 preferably has an intermediate tank gas injection port 231 provided on the upper side wall of the intermediate tank 23 as shown in fig. 2; the first gas pipeline 01 is also provided with a third gas branch 03; one end of the third gas branch 03 is communicated with the first gas pipeline 01, and the other end of the third gas branch 03 is communicated with the intermediate charging bucket 23 through an intermediate charging bucket gas injection port 231.
Because the shape setting of masterbatch section unloading unit 2, the regional of the sliced unloading cross-section of masterbatch can change along with the unloading height, especially when through intermediate tank 23, the regional sudden increase and reduction can appear in the unloading cross-section, this partial resistance loss (pressure drop) is not negligible, through injecting inert gas into third gas branch 03, can in time supplement that partial pressure drop of loss, thereby be favorable to keeping the constancy of pressure in the intermediate tank 23, the sliced ejection of compact pressure of masterbatch has further been stabilized promptly, thereby can further guarantee the stability of masterbatch section unloading speed.
In addition, one end of a third gas branch 03 is communicated with the first gas pipeline 01, the other end of the third gas branch 03 is communicated with the intermediate charging bucket 23 through an intermediate charging bucket gas injection port 231, pressure consistency of the main material bin 11, the color master batch bin 21 and the intermediate charging bucket 23 is guaranteed, control and operation steps are simplified, synchronous change of main material slicing blanking pressure and color master batch slicing blanking pressure is favorably maintained, the ratio of blanking speeds of the main material slicing blanking unit 1 and the color master batch slicing blanking unit 2 can be kept constant, uniformity of color master batch concentration in mixed discharging is achieved, color uniformity of produced colored fiber products is favorably improved, and quality of the colored fiber products is further improved.
In order to prevent the phenomenon that the blanking of the slices is not smooth due to the fact that the lower pressure is larger than the upper pressure caused by the air pressure fluctuation caused by the blanking of the slices (main material slices, color master batch slices and mixed slices), the constant-pressure feeding system for dope dyeing provided by the embodiment preferably further comprises a spinning screw extruder 4, as shown in fig. 2; the feed inlet of the spinning screw extruder 4 is a screw feed inlet 41; the spinning screw extruder 4 is positioned below the mixing unit 3, and the screw feeding hole 41 is opposite to the discharging hole of the mixing unit 3; the spinning screw extruder 4 is communicated with the mixing unit 3 through a screw feeding hole 41; the bottom of the screw feed port 41 is provided with a gas discharge port 411.
The spinning screw extruder 4 is used for fully mixing the main material slices flowing out of the mixing unit 3 and the mixed slices formed by the color master batch slices, melting the mixed slices to form a composite melt by controlling the temperature of a screw of the screw extruder 4, outputting the composite melt to a subsequent spinning part for spinning, and producing a colored fiber finished product after a series of processes.
Through the aperture of the gas discharge port 411 which is positioned at the bottom of the screw feed port 41, inert gas is discharged from the constant-pressure feeding system for the dope dyeing at a lower speed, and through the pressure loss of the screw feed port 41, the whole constant-pressure feeding system for the dope dyeing is ensured to maintain a certain pressure gradient from top to bottom (the lower pressure is always smaller than the upper pressure), so that the smooth blanking of the slices is facilitated.
In order to facilitate the control of the blanking speed of the color master batch slices, in the constant-pressure feeding system for dope dyeing provided in this embodiment, preferably, as shown in fig. 2, the color master batch slice blanking unit 2 further includes a color master batch metering mechanism 25 for controlling the blanking speed of the color master batch slices; the masterbatch metering mechanism 25 is mounted on the masterbatch discharging pipe 24. The color master batch metering mechanism 25 comprises a color master batch metering pump and a first motor for driving the color master batch metering pump to operate; the masterbatch metering mechanism 25 is mounted on the masterbatch discharging pipe 24 through a masterbatch metering pump. Through installing masterbatch metering mechanism 25 on masterbatch discharging pipe 24, can control conveniently and adjust the sliced discharge speed of masterbatch as required to satisfy the production needs better. For example, the masterbatch metering pump can be driven by a motor to work so as to control the masterbatch blanking speed, and specifically, the running state of the masterbatch metering pump can be adjusted by adjusting the number of revolutions of the motor.
In the constant-pressure feeding system for dope dyeing provided in the preferred embodiment, specifically, as shown in fig. 2, the main material slicing and blanking unit 1 includes a main material bin 11 and a main material discharging pipe 12 which are sequentially communicated from top to bottom; the main material slice blanking unit 1 also comprises a main material metering mechanism 13 for controlling the discharging speed of the main material slices; the main material metering mechanism 13 is arranged on the main material discharging pipe 12. When the constant-pressure feeding system for dope dyeing according to the preferred embodiment is used for blanking the color master batch slices for dope dyeing, sufficient main material slices are added into the main material bin 11. Then, the top of the main material bin 11 is closed, and the inert gas is continuously introduced into the first gas pipeline 01 through the second gas branch 02, so that the pressure in the main material bin 11 is kept constant. The main material slices move downwards under the drive of self gravity and air pressure and enter the mixing unit 3 along the main material discharge pipe 12.
In the constant-pressure feeding system for dope dyeing provided in this embodiment, preferably, the mixing unit 3 is specifically a three-way pipeline mixer; two of the channel openings of the three-way pipeline mixer are respectively communicated with the main material slice blanking unit 1 and the master batch slice blanking unit 2, and the rest channel opening of the three-way pipeline mixer is vertically arranged downwards. The three-way pipeline mixer is used as a place for providing the initial mixing of the main material slices and the color master batch slices, and has great influence on improving the color uniformity of the produced colored fiber products. The three-way pipeline mixer is simple in structure, can be well matched with the main material section blanking unit 1 and the color master batch section blanking unit 2, reduces the transformation cost of the self-assembled constant-pressure feeding system for spinning dyeing, and is convenient to assemble and disassemble and high in reliability.
The constant pressure feeding system for dope dyeing that this embodiment provided, specifically, all be provided with the gas discharge pipe 001 that can open and close on the lower lateral wall of masterbatch feed bin 21 and on the lower lateral wall of major ingredient feed bin 11. The gas discharge pipe 001 is used to facilitate a quick and safe pressure release operation at the time of a production stoppage or maintenance. In normal production, the gas discharge pipe 001 is in a normally closed state.
The constant pressure feeding system for dope dyeing provided in this embodiment, specifically, the bottom of the color masterbatch bin 21 and the bottom of the main material bin 11 are both in a conical hopper shape.
The above only is the preferred embodiment of the present invention, not limiting the scope of the present invention, all the equivalent structural changes made by the contents of the specification and the drawings, or the direct or indirect application in other related technical fields, are included in the same way in the protection scope of the present invention.
Claims (7)
1. The constant-pressure feeding system for the dope dyeing is characterized in that the constant-pressure feeding system for the dope dyeing is arranged along the vertical direction; the constant-pressure feeding system for the dope dyeing comprises a main material slice blanking unit, a color master batch slice blanking unit and a mixing unit; the main material slice blanking unit and the color master batch slice blanking unit are both positioned above the mixing unit and are respectively communicated with the mixing unit; the main material slicing and blanking unit comprises a main material bin; the main material bin is positioned at the top of the main material slicing and blanking unit; the color master batch slice blanking unit comprises a color master batch bin; the color master batch bin is positioned at the top of the color master batch slice blanking unit; the top of the main material bin is communicated with the top of the color master batch bin through a first gas pipeline; a second gas branch is arranged on the first gas pipeline; one end of the second gas branch is communicated with the first gas pipeline, and the other end of the second gas branch is communicated with an inert gas source.
2. The constant-pressure feeding system for dope dyeing according to claim 1, wherein the masterbatch slice blanking unit comprises the masterbatch bin, a valve, a first intermediate tank and a masterbatch discharging pipe which are sequentially communicated from top to bottom; and the intermediate material tank is filled with the color master batch slices.
3. The constant pressure feeding system for dope dyeing according to claim 2, wherein an intermediate tank gas injection port is provided on the upper side wall of the intermediate tank; a third gas branch is also arranged on the first gas pipeline; one end of the third gas branch is communicated with the first gas pipeline, and the other end of the third gas branch is communicated with the intermediate charging bucket through the gas injection port of the intermediate charging bucket.
4. The constant pressure feed system for dope dyeing according to claim 1, wherein the constant pressure feed system for dope dyeing further comprises a spinning screw extruder; the feed inlet of the spinning screw extruder is a screw feed inlet; the spinning screw extruder is positioned below the mixing unit, and the screw feeding hole is over against the discharging hole of the mixing unit; the spinning screw extruder is communicated with the mixing unit through the screw feeding hole; and a gas discharge port is formed in the bottom of the screw feeding port.
5. The constant pressure feeding system for dope dyeing according to claim 2, wherein the masterbatch pellet feeding unit further comprises a masterbatch metering mechanism for controlling a feeding speed of the masterbatch pellet; the masterbatch metering mechanism is arranged on the masterbatch discharging pipe.
6. The constant-pressure feeding system for dope dyeing according to claim 1, wherein the main material slicing and blanking unit comprises a main material bin and a main material discharging pipe which are sequentially communicated from top to bottom; the main material slice blanking unit also comprises a main material metering mechanism for controlling the discharging speed of the main material slices; the main material metering mechanism is arranged on the main material discharge pipe.
7. The constant pressure feeding system for dope dyeing according to claim 1, wherein the mixing unit is specifically a three-way pipe mixer; two of the passage openings of the three-way type pipeline mixer are respectively communicated with the main material slice blanking unit and the master batch slice blanking unit, and the rest passage opening of the three-way type pipeline mixer is vertically arranged downwards.
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