CN217869208U - Film forming evaporator for processing Lyocell fiber spinning solution - Google Patents
Film forming evaporator for processing Lyocell fiber spinning solution Download PDFInfo
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- CN217869208U CN217869208U CN202221697450.7U CN202221697450U CN217869208U CN 217869208 U CN217869208 U CN 217869208U CN 202221697450 U CN202221697450 U CN 202221697450U CN 217869208 U CN217869208 U CN 217869208U
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Abstract
The utility model discloses a film formation evaporator for processing Lyocell fiber spinning solution. The film-forming evaporator comprises a driving structure, a film-forming pipeline, a negative pressure system and three fluid film-forming mixing screws; the three screws are mutually meshed and arranged in the film forming pipeline in a parallel or triangular arrangement, the screws are divided into a plurality of functional areas, a feeding and pressurizing section, a five-stage mixing and dissolving section, a film forming and dehydrating section, a mixing and dissolving section and a pressurizing and conveying section are sequentially arranged along the axial direction of the screws, each functional area outside the film forming pipeline corresponds to one temperature control assembly, the film forming pipeline is provided with a feeding port corresponding to the feeding and pressurizing section, the film forming pipeline and the corresponding film forming and dehydrating section form a film forming and defoaming chamber, and the negative pressure system is communicated with the inside of the film forming pipeline through the film forming and defoaming chamber. The utility model discloses not only can realize that the completion of Lyocell fiber spinning stoste dissolves, can also realize the quick desorption of bubble in the stoste, strengthen the pressure of stoste simultaneously, improve the production rate of follow-up spinning.
Description
Technical Field
The utility model relates to a fibre spinning technical field especially relates to a processing Lyocell fibre spinning dope's film-forming evaporation ware.
Background
Lyocell fiber, namely regenerated cellulose fiber, is a green environment-friendly fiber which is rapidly developed in recent decades and is prepared by dry jet-wet spinning by taking natural regenerated cellulose as a raw material. Because the organic solvent used in the production process can be completely recovered, the method is pollution-free, and the prepared fiber can be completely biodegraded, so the method is known as the environment-friendly fiber in the twenty-first century. Meanwhile, the Lyocell fiber has strong moisture absorption and air permeability, soft and smooth hand feeling and good stability, and the strength of the Lyocell fiber meets the general requirements of textiles. Therefore, lyocell fibers are receiving attention, and the annual demand tends to increase rapidly.
The uniformity and stability of Lyocell fibre dope is critical to the production of Lyocell fibres. Because cellulose has the characteristics of high crystallinity, large molecular weight, strong rigidity, many hydrogen bonds and the like, the cellulose is difficult to directly and rapidly dissolve in a methylmorpholine oxide (NMMO) organic solvent. At present, the cellulose raw material is dissolved by an indirect dissolution method, which comprises 5 procedures of mixing, infiltrating, swelling and dissolving, and has the problems of high energy consumption, long period, large equipment investment and the like. Meanwhile, the prepared Lyocell fiber spinning solution has the problems of white core, uneven solid content of fiber and the like, and uniform and stable preparation of the Lyocell fiber spinning solution is difficult to realize.
Therefore, it is very urgent to develop a processing device capable of producing uniform and stable Lyocell fiber spinning solution.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide an even film forming evaporator who stably processes Lyocell fibre spinning stoste to the above-mentioned not enough of prior art.
The utility model discloses a film-forming evaporator for processing Lyocell fiber spinning solution, which comprises a driving structure, a film-forming pipeline, a negative pressure system and three fluid film-forming mixing screws; the three fluid film-forming mixing screws are mutually meshed and arranged in the film-forming pipeline in a parallel or triangular manner, the driving structure is in transmission connection with the three fluid film-forming mixing screws so as to drive the fluid film-forming mixing screws to rotate, the fluid film-forming mixing screws are divided into a plurality of functional areas, and the functional areas sequentially comprise a feeding pressurizing section, a five-level mixing dissolving section, a film-forming dehydrating section, a mixing dissolving section and a pressurizing conveying section along the axial direction of the fluid film-forming mixing screws, each functional area outside the film-forming pipeline corresponds to one temperature control component, the film-forming pipeline is provided with a feeding port corresponding to the feeding pressurizing section, the film-forming dehydrating section, the corresponding film-forming pipeline and a negative pressure pipeline form a film-forming defoaming chamber, and the negative pressure system is communicated with the inside of the film-forming pipeline through the film-forming defoaming chamber; and a solution fluid outlet is arranged at the tail end of the film forming pipeline and is connected with a spinning system.
Further, the ratio L/D of the total length L of the fluid film-forming mixing screw to the outer diameter D thereof is 58 to 64.
Further, the length of the feeding pressurization section is 8-10D, the feeding pressurization section is composed of 6-9 forward spiral elements, the element lead range is 0.75-1.5D, and the lead is gradually reduced along the melt conveying direction.
Further, the length of the mixing dissolving segment is 5D, and the mixing dissolving segment consists of 2 forward spiral elements, 2 forward kneading block elements and 1 reverse kneading block element; the lead of the 2 forward spiral elements along the melt conveying direction is 1.5D and 1D; the length of the forward kneading block element is 1D, the thickness of the kneading sheet is 0.2D, and the staggering angle of the kneading sheets is 30 degrees and 60 degrees respectively along the melt conveying direction; the length of the reverse kneading block elements was 0.5D, the thickness of the kneading pieces was 0.125D, and the kneading piece stagger angles were-30 degrees in the melt conveying direction, respectively.
Further, the length of the film-forming dehydrating section was 3.6D, and it was composed of 2 forward spiral elements having a lead of 1.8D, a helix angle of 32.8 degrees, a spiral groove depth of 0.16D, and a spiral ridge thickness of 0.18D.
Further, the length of the pressurized conveying section is 3.5-5D, the pressurized conveying section is composed of 5-7 forward spiral elements, the lead range is 0.5D-1D, the lead gradually decreases along the melt conveying direction, and the last 3 forward spiral elements with leads of 0.5D are provided.
Putting cellulose pulp into a premixer, adding an NMMO/water mixed solution, and fully stirring to obtain a premix A; then the premix A is transmitted to the film forming evaporator, is uniformly mixed through a feeding and pressurizing section and establishes higher fluid pressure, the fluid pressure is reduced and the film is rapidly formed in a film forming and dehydrating section, the moisture on the surface interface of the premix A is rapidly removed through a negative pressure system, and the composition of NMMO/water/cellulose pulp is accurately controlled by regulating the evaporation amount of the moisture, so that the completely dissolved Lyocell fiber spinning solution is obtained; then the mixture is pressurized and conveyed to a spinning system after being evenly mixed.
Generally, through the utility model discloses above technical scheme who conceives compares with prior art, can gain following beneficial effect:
(1) The utility model discloses a film forming evaporator has overcome the difficult point that traditional processing method is difficult to realize long-term continuous stable production, can accurate control moisture, realizes dissolving completely of cellulose thick liquids, makes even stable Lyocell fibre spinning stoste.
(2) The utility model provides a film forming evaporator not only can realize that the completion of Lyocell fiber spinning dope dissolves, can also realize the desorption of bubble in the Lyocell fiber spinning dope, strengthens the pressure of Lyocell fiber spinning dope simultaneously, improves the production rate of follow-up spinning.
Drawings
FIG. 1 is a schematic diagram of the internal structure of a film-forming pipe of a film-forming evaporator for processing a Lyocell fiber spinning solution according to the present invention;
fig. 2 is a side view of fig. 1.
1. A film forming pipeline; 2. a negative pressure system; 3. a fluid film-forming mixing screw; 4. a feeding pressurization section; 5. a mixing and dissolving section; 6. a film forming and dewatering section; 7. a pressurized conveying section; 8. a temperature control assembly; 9. a feeding port; 10. a film forming de-bubbling chamber; 11. an outlet; 12. a heating block; 13. a cooling water passage.
Detailed Description
The following are specific embodiments of the present invention and the accompanying drawings are used to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.
As shown in fig. 1 and 2, the film forming evaporator for processing Lyocell fiber spinning solution of the present invention comprises a driving structure (not shown in the figure), a film forming pipeline 1, a negative pressure system 2 and three fluid film forming mixing screws 3; the three fluid film-forming mixing screws 3 are mutually meshed and arranged in the film-forming pipeline 1 in a parallel or triangular manner, a driving structure is in transmission connection with the three fluid film-forming mixing screws 3 to drive the fluid film-forming mixing screws 3 to rotate, the fluid film-forming mixing screws 3 are divided into a plurality of functional areas, the functional areas are a feeding pressurizing section 4, a five-level mixing dissolving section 5, a film-forming dehydrating section 6, a mixing dissolving section 5 and a pressurizing conveying section 7 in sequence along the axial direction of the functional areas, each functional area outside the film-forming pipeline 1 corresponds to one temperature control component 8, the film-forming pipeline 1 is provided with a feeding port 9 corresponding to the feeding pressurizing section 4, the film-forming pipeline 1 is provided with a film-forming and dehydrating chamber 10 corresponding to the film-forming dehydrating section 6, and the negative pressure system 2 is communicated with the interior of the film-forming pipeline 1 through the film-forming and dehydrating chamber 10; the tail end of the film forming pipeline 1 is provided with an outlet 11; the ratio L/D of the total length L of the fluid film-forming mixing screw to the outer diameter D thereof is 58 to 64.
The utility model provides a film forming evaporator not only can realize that the completion of Lyocell fiber spinning dope dissolves, can also realize the desorption of bubble in the Lyocell fiber spinning dope, strengthens the pressure of Lyocell fiber spinning dope simultaneously, improves the production rate of follow-up spinning.
In one embodiment, the ratio L/D of the total length L of the fluid film-forming mixing screw to its outer diameter D may be 60.25.
The length of the feeding pressurizing section can be 8-10D, the feeding pressurizing section consists of 6-9 forward spiral elements, the element lead range is 0.75-1.5D, the lead gradually decreases along the melt conveying direction, in an implementable mode, the length of the feeding pressurizing section 4 can be 8.75D, the feeding pressurizing section consists of 7 forward spiral elements, and the leads along the melt conveying direction are respectively 1.5D, 1.25D, 1D and 0.75D. The lead is 1.5D element, the helical angle is 25.5 degrees, the depth of the helical groove is 0.16D, the thickness of the helical edge is 0.25D, and the clearance between the helical edge and the inner wall of the film forming pipeline 1 can be 1.2mm; the lead is 1.25D element, the helix angle is 21.7 degrees, the depth of the helical groove is 0.16D, the thickness of the helical ridge is 0.2D, and the clearance between the helical ridge and the inner wall of the film forming pipeline 1 is 1.2mm; the lead is 1D element, the helical angle is 17.7 degrees, the depth of the helical groove is 0.16D, the thickness of the helical edge is 0.15D, and the clearance between the helical edge and the inner wall of the film forming pipeline 1 can be 1.2mm; the lead is 0.75D element, the helix angle is 16.0 degrees, the depth of the spiral groove is 0.16D, the thickness of the spiral edge is 0.12D, and the clearance between the spiral edge and the inner wall of the film forming pipeline 1 can be 1.2mm.
The feeding port 9 corresponds to the element with 1.5D lead, and the feeding pressurizing section 4 adopts a plurality of elements with large lead to increase the pulp conveying amount, thereby improving the yield; the pulp is fully compressed by the element with gradually reduced lead, and bubbles brought into the film forming evaporator are reduced as much as possible.
The mixing and dissolving section 5 can be 5D in length and consists of 2 forward spiral elements, 2 forward kneading block elements and 1 reverse kneading block element; the lead of the 2 forward spiral elements along the melt conveying direction is 1.5D and 1D; the length of the forward kneading block element is 1D, the thickness of the kneading pieces is 0.2D, the staggering angles of the kneading pieces are respectively 30 degrees and 60 degrees along the melt conveying direction, and the gap between the kneading pieces and the inner wall of the film forming pipeline 1 can be 0.75mm; the length of the reverse kneading block element was 0.5D, the thickness of the kneading pieces was 0.125D, the stagger angles of the kneading pieces in the melt-conveying direction were-30 degrees, respectively, and the clearance between the kneading pieces and the inner wall of the film-forming tube 1 could be 0.5mm.
The mixing and dissolving section 5 promotes the dissolution of incompletely dissolved cellulose in the pulp by the high-frequency kneading action of the forward kneading block element; a higher solution pressure is established by the reverse kneading block elements.
The length of the film forming and dewatering section 6 can be 3.6D, the film forming and dewatering section is composed of 2 forward spiral elements with 1.8D lead, the spiral angle is 32.8 degrees, the spiral groove depth of the spiral is 0.16D, the thickness of the spiral edge is 0.18D, and the gap between the spiral edge and the inner wall of the film forming pipeline 1 can be 1.2mm.
The film forming and dewatering section 6 uses a large-lead element to enable the spinning solution to form a film rapidly and keep low solution pressure, gas in the solution is removed efficiently, and spinning uniformity and fiber quality are improved.
The length of the pressurizing conveying section can be 3.5 to 5D, the pressurizing conveying section consists of 5 to 7 forward spiral elements, the lead range is 0.5D to 1D, the lead is gradually reduced along the melt conveying direction, and the last 3 forward spiral elements with the leads of 0.5D are all provided, in an implementable mode, the length of the pressurizing conveying section 7 can be 3.5D, the pressurizing conveying section consists of 5 forward spiral elements, and the leads along the melt conveying direction are respectively 1D, 0.5D and 0.5D; the lead is 1D element, the helical angle is 17.7 degrees, the depth of the helical groove is 0.16D, the thickness of the helical edge is 0.15D, and the clearance between the helical edge and the inner wall of the film forming pipeline 1 is 1.2mm; the lead is 0.5D element, the helix angle is 9.1 degrees, the depth of the helical groove is 0.16D, the thickness of the helical edge is 0.06D, and the clearance between the helical edge and the inner wall of the film forming pipeline 1 is 0.5mm.
The lead is gradually reduced by combining with the elements of the membrane dewatering section 6 to establish certain solution pressure, and the small lead element with repeated tail ends ensures the uniform and stable output of spinning solution.
Wherein, the temperature control assembly 8 may include a heating block 12, a cooling water channel 13 disposed in the wall of the film forming pipeline 1, and a temperature sensor (not shown in the figure), the temperature inside the film forming pipeline 1 is monitored in real time by the temperature sensor, and the temperature inside is controlled by the cooling water flowing in the heating block 12 and the cooling water channel 13.
The specific operation of using the film-forming evaporator to process the Lyocell fiber spinning solution is as follows: firstly, putting cellulose pulp into a premixer, adding an NMMO/water mixed solution, and fully stirring to obtain a premix A; and then the premix A is transmitted to a film forming evaporator, the premix A is uniformly mixed through a feeding and pressurizing section 4, higher fluid pressure is established, the fluid pressure is reduced and the film is rapidly formed in a film forming and dehydrating section 6, the moisture on the surface interface of the premix A is rapidly removed through a negative pressure system 2, and the composition of NMMO/water/cellulose pulp is accurately controlled by regulating the evaporation capacity of the moisture, so that the completely dissolved Lyocell fiber spinning solution is obtained.
The utility model provides a processing apparatus of the even stable Lyocell fibre spinning dope of continuous preparation, the device have overcome traditional processing method and have been difficult to realize the difficult point of long-term continuous stable production, can accurate control moisture, realize dissolving completely of cellulose pulp, make even stable Lyocell fibre spinning dope.
The above is not relevant and is applicable to the prior art.
Although certain specific embodiments of the present invention have been described in detail by way of illustration, it will be understood by those skilled in the art that the foregoing examples are for purposes of illustration only and are not intended to limit the scope of the invention, which is to be construed as broadly as the present invention will suggest themselves to those skilled in the art to which the invention pertains and which is susceptible to various modifications or additions and similar arrangements to the specific embodiments described herein without departing from the scope of the invention as defined in the appended claims. It should be understood by those skilled in the art that any modifications, equivalent substitutions, improvements and the like made to the above embodiments according to the technical spirit of the present invention should be included in the scope of the present invention.
Claims (6)
1. A film forming evaporator for processing Lyocell fiber spinning solution is characterized in that: the device comprises a driving structure, a film forming pipeline, a negative pressure system and three fluid film forming mixing screws; the three fluid film-forming mixing screws are mutually meshed and arranged in the film-forming pipeline in a parallel or triangular manner, the driving structure is in transmission connection with the three fluid film-forming mixing screws so as to drive the fluid film-forming mixing screws to rotate, the fluid film-forming mixing screws are divided into a plurality of functional areas, and the functional areas sequentially comprise a feeding pressurizing section, a five-level mixing dissolving section, a film-forming dehydrating section, a mixing dissolving section and a pressurizing conveying section along the axial direction of the fluid film-forming mixing screws, each functional area outside the film-forming pipeline corresponds to one temperature control component, the film-forming pipeline is provided with a feeding port corresponding to the feeding pressurizing section, the film-forming dehydrating section, the corresponding film-forming pipeline and a negative pressure pipeline form a film-forming and defoaming chamber, and the negative pressure system is communicated with the interior of the film-forming pipeline through the film-forming and defoaming chamber; and a solution fluid outlet is arranged at the tail end of the film forming pipeline and is connected with a spinning system.
2. The film forming evaporator for processing Lyocell fiber dope of claim 1, wherein: the ratio L/D of the total length L of the fluid film-forming mixing screw to the outer diameter D thereof is 58 to 64.
3. The film forming evaporator for processing Lyocell fiber dope of claim 1, wherein: the length of the feeding pressurization section is 8-10D, the feeding pressurization section consists of 6-9 forward spiral elements, the element lead range is 0.75-1.5D, and the lead gradually decreases along the melt conveying direction.
4. A film forming evaporator for processing Lyocell fibre dope as claimed in claim 2, wherein: the length of the mixing dissolving segment is 5D, and the mixing dissolving segment consists of 2 forward spiral elements, 2 forward kneading block elements and 1 reverse kneading block element; the lead of the 2 forward spiral elements along the melt conveying direction is 1.5D and 1D; the length of the forward kneading block element is 1D, the thickness of the kneading sheet is 0.2D, and the staggering angle of the kneading sheets is 30 degrees and 60 degrees respectively along the melt conveying direction; the length of the reverse kneading block elements was 0.5D, the thickness of the kneading pieces was 0.125D, and the kneading piece stagger angles were-30 degrees in the melt conveying direction, respectively.
5. The film forming evaporator for processing Lyocell fiber dope of claim 1, wherein: the length of the film-forming dehydration section is 3.6D, the film-forming dehydration section consists of 2 forward spiral elements with 1.8D lead, the spiral angle is 32.8 degrees, the depth of a spiral groove is 0.16D, and the thickness of a spiral edge is 0.18D.
6. The film forming evaporator for processing Lyocell fiber dope of claim 1, wherein: the length of the pressurized conveying section is 3.5-5D, the pressurized conveying section consists of 5-7 forward spiral elements, the lead range is 0.5D-1D, the lead gradually decreases along the melt conveying direction, and the last 3 forward spiral elements with leads of 0.5D are provided.
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| CN202221697450.7U CN217869208U (en) | 2022-06-30 | 2022-06-30 | Film forming evaporator for processing Lyocell fiber spinning solution |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115323501A (en) * | 2022-06-30 | 2022-11-11 | 武汉纺织大学 | Film forming evaporator and method for processing Lyocell fiber spinning solution |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115323501A (en) * | 2022-06-30 | 2022-11-11 | 武汉纺织大学 | Film forming evaporator and method for processing Lyocell fiber spinning solution |
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