CN223818562U - Oxidation polymerization reducing system for producing fibers - Google Patents
Oxidation polymerization reducing system for producing fibersInfo
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- CN223818562U CN223818562U CN202423173650.4U CN202423173650U CN223818562U CN 223818562 U CN223818562 U CN 223818562U CN 202423173650 U CN202423173650 U CN 202423173650U CN 223818562 U CN223818562 U CN 223818562U
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Abstract
The utility model discloses an oxidation and polymerization reduction system for producing fibers, which relates to the technical field of viscose staple fiber production equipment in textile industry and comprises an impregnating barrel I, a squeezer, a spiral mixer, a medium-thick pulp porridge mixing barrel and an oxygen-alkali reaction kettle, wherein the impregnating barrel I is connected with an alkali liquor replenishing pipeline, the impregnating barrel I is connected with an inlet of the squeezer through a pipeline I, a material outlet of the squeezer is communicated with an inlet of the spiral mixer, an outlet of the spiral mixer is communicated with the medium-thick pulp porridge mixing barrel, the thick pulp porridge mixer is connected with the oxygen-alkali reaction kettle through a pipeline II, a steam pipeline and an oxygen pipeline are arranged on the pipeline II, the spiral mixer is connected with the alkali liquor replenishing pipeline, the steam pipeline is connected with the steam replenishing pipeline, and the oxygen pipeline is connected with the oxygen replenishing pipeline.
Description
Technical Field
The utility model relates to the technical field of viscose staple fiber production equipment in textile industry, in particular to an oxidation polymerization reducing system for producing fibers.
Background
At present, viscose staple fiber market competition is strong, and related enterprises are more challenging to survive due to the influence of energy, environmental protection and safety. How to increase market share under the fierce competition environment, and on the premise of meeting the environmental protection, safety production and the like, the improvement of product quality and the reduction of production cost are particularly critical.
In the process of producing cellulose fibers, the conventional viscose staple fiber aging process generally adopts an aging drum polymerization reducing process. The degradation and polymerization of the old drum are relatively mature equipment adopted by viscose staple fibers, the length of the old drum is about 26.5m and phi 3 m, the two ends of the old drum are provided with rotating structures, and the middle part of the old drum is provided with a carrier roller and is connected with a speed reducer and a motor to realize rotation. The aging drum is provided with a jacket, medium (clean water, brine and the like) with different temperatures can be connected into the jacket, and the temperature of alkali cellulose in the drum is controlled by adjusting the temperature of the jacket medium of the aging drum, so that the desired cellulose polymerization degree is achieved.
The polymerization reducing mode has the following defects:
1. the old drum equipment is large in volume and large in occupied area;
2. In the production process, the cellulose stays in the old drum for a long time, and after the cellulose is subjected to polymerization reduction, the loss of oxidation polymerization reduction is large.
Disclosure of utility model
The utility model aims to solve the problems of large equipment occupation area, longer residence time of cellulose in an old drum and larger oxidative polymerization loss after the cellulose is subjected to polymerization reduction in the prior art.
In order to achieve the above object, the present utility model has the following technical scheme:
An oxidation polymerization reducing system for producing fiber comprises an impregnating barrel I, a squeezer, a spiral mixer, a medium-thick pulp porridge mixing barrel and an oxygen-alkali reaction kettle, wherein the impregnating barrel I is connected with an alkali liquor replenishing pipeline, the impregnating barrel I is connected with an inlet of the squeezer through a pipeline I, a material outlet of the squeezer is communicated with an inlet of the spiral mixer, an outlet of the spiral mixer is communicated with the medium-thick pulp porridge mixing barrel, the thick pulp porridge mixer is connected with the oxygen-alkali reaction kettle through a pipeline II, a steam pipeline and an oxygen pipeline are arranged on the pipeline II,
The spiral mixer is connected with an alkali liquor replenishing pipeline, the steam pipeline is connected with a steam replenishing pipeline, and the oxygen pipeline is connected with an oxygen replenishing pipeline.
Further, a crushing mechanism is arranged at the material outlet end of the squeezer.
Further, the spiral mixer is a pipeline type spiral mixer, a plurality of alkali liquor inlets are arranged on the spiral mixer, and the spiral mixer is connected with an alkali liquor supply pipeline through the alkali liquor inlets.
Further, the medium-concentration porridge mixing barrel is a vertical mixer, the upper end of the medium-concentration porridge mixing barrel is provided with a feed inlet I, the lower end of the medium-concentration porridge mixing barrel is provided with a discharge outlet I, and a stirring mechanism with 4-8 layers of spiral stirring blades is arranged in the medium-concentration porridge mixing barrel.
Further, the spiral mixer and the medium-consistency porridge mixing barrel are of an integrated structure, and the discharge end of the spiral mixer is communicated with the feed end of the medium-consistency porridge mixing barrel.
Further, the steam pipeline is close to the medium-concentration porridge mixing barrel, and the oxygen pipeline is arranged at the rear end of the steam pipeline.
Further, a plurality of steam inlets are arranged on the steam pipeline, and the steam pipeline is connected with a steam supply pipeline through the steam inlets.
Further, a porridge pump is arranged at the bottom of the medium-concentration porridge mixing barrel.
Further, the discharge end of the oxygen alkali reaction kettle is connected with an impregnating barrel II through a pipeline III, and the impregnating barrel II is connected with an alkali liquor supply pipeline.
The utility model has the beneficial effects that:
1. In the utility model, a new oxidation and polymerization reduction system for producing fibers is provided to replace the original old drum equipment to carry out polymerization reduction treatment on cellulose. The oxidation and polymerization reduction system relates to the working principle that the polymerization degree of cellulose is reduced in an oxygen-alkali reaction kettle under the conditions of certain pressure, time and temperature by mixing oxygen, alkali liquor and cellulose, so that the traditional aging drum is replaced, the polymerization degree of alkali cellulose is reduced, the loss of the alkali cellulose in the production process is reduced, the production cost is reduced, and the technical problems of large occupied area, high energy consumption and the like of the traditional aging process system are solved.
2. In the utility model, the material outlet end of the squeezer is provided with a crushing mechanism for crushing the alkali cellulose filter cake obtained after the treatment of the squeezer, and the crushing mechanism is preferably designed into a multi-stage crushing structure.
3. In the utility model, the spiral mixer is a pipeline type spiral mixer, which is convenient for fully mixing solid materials such as alkali cellulose and alkali liquor, and simultaneously is convenient for adjusting the total length of the pipeline type spiral mixer so as to be suitable for the production of different types of fibers. Be equipped with a plurality of alkali lye inlets on the spiral blender, the spiral blender passes through alkali lye inlet connection alkali lye supply line, can divide the multistage alkali lye of adding, avoids once only adding the unstable condition that causes product quality behind the alkali lye.
4. According to the utility model, the medium-concentration porridge mixing barrel is a vertical mixer, the medium-concentration porridge mixing barrel is of a hollow stainless steel structure, the upper end of the medium-concentration porridge mixing barrel is provided with a feed inlet I, the lower end of the medium-concentration porridge mixing barrel is provided with a discharge outlet I, and a stirring mechanism with 4-8 layers of spiral stirring blades is arranged in the medium-concentration porridge mixing barrel, so that further mixing of the porridge is realized.
5. In the utility model, a preferable spiral mixer and a medium-concentration porridge mixing barrel are also provided as an integrated structure, the discharge end of the spiral mixer is communicated with the feed end of the medium-concentration porridge mixing barrel, so that two working sections are continuously carried out, the expected porridge mixing effect is achieved, the occupied area of equipment can be reduced, and the waste of alkali liquor is avoided.
6. In the utility model, the steam pipeline is provided with the plurality of steam inlets, the steam pipeline is connected with the steam supply pipeline through the steam inlets, and the steam supply pipeline evenly introduces steam into the steam pipeline through the plurality of steam inlets, so that the problem of poor quality of finished products caused by uneven heating of fibers is avoided.
7. In the utility model, the bottom of the medium-concentration porridge mixing barrel is provided with the porridge pump, the other end of the porridge pump is connected with the oxygen-alkali reaction kettle, the porridge pump is preferably a pump with an internal structure of a double-head symmetrical spiral structure, and the stirring and conveying functions of the porridge can be realized through high-speed rotation.
8. According to the utility model, the discharge end of the oxygen alkali reaction kettle is connected with the dipping barrel II through the pipeline III, the dipping barrel II is connected with the alkali liquor replenishing pipeline, and the dipping barrel II is used for dissolving organic or inorganic impurities generated after cellulose reacts with oxygen alkali in alkali liquor, so that the quality of cellulose is improved, and the preparation quality of alkali fibers is improved.
Drawings
FIG. 1 is a schematic diagram of the structure of an oxidative degradation system.
FIG. 2 is a schematic structural diagram of another embodiment of an oxidative degradation system.
FIG. 3 is a schematic structural diagram of yet another embodiment of an oxidative degradation system.
FIG. 4 is a schematic diagram of another preferred embodiment of an oxidative degradation system.
FIG. 5 is a schematic diagram of the structure of yet another preferred embodiment of an oxidative degradation system.
Wherein, 1, a dipping barrel I, 2, a squeezer, 3, a spiral mixer, 4, a medium concentration porridge mixing barrel, 5, an oxygen-alkali reaction kettle, 6, an alkali liquor replenishing pipeline, 7, a pipeline I, 8, a pipeline II, 9, a steam pipeline, 10, a steam replenishing pipeline, 11, an oxygen pipeline, 12, an oxygen replenishing pipeline, 13, a crushing mechanism, 14, an alkali liquor inlet, 15, a stirring mechanism, 16, a steam inlet, 17, a porridge pump, 18, a pipeline III, 19, a dipping barrel II, 20, an alkali station, 21, a steam station, 22, an oxygen station, 4.1, a feed inlet I, 4.2 and a discharge outlet I.
Detailed Description
The present utility model will be described in further detail with reference to examples, but embodiments of the present utility model are not limited thereto.
Example 1
An oxidation polymerization reduction system for producing fibers relates to the technical field of viscose staple fiber production equipment in textile industry, referring to fig. 1, the oxidation polymerization reduction system comprises an impregnating barrel I1, a squeezer 2, a spiral mixer 3, a medium thick paste porridge mixing barrel 4 and an oxygen alkali reaction kettle 5, wherein the impregnating barrel I1 is connected with an alkali liquor supply pipeline 6, the impregnating barrel I1 is connected with an inlet of the squeezer 2 through a pipeline I7, a material outlet of the squeezer 2 is communicated with an inlet of the spiral mixer 3, an outlet of the spiral mixer 3 is communicated with the medium thick paste porridge mixing barrel 4, the thick paste porridge mixer is connected with the oxygen alkali reaction kettle 5 through a pipeline II8, a steam pipeline 9 and an oxygen pipeline 11 are arranged on the pipeline II8,
The spiral mixer 3 is connected with an alkali liquor replenishing pipeline 6, the steam pipeline 9 is connected with a steam replenishing pipeline 10, and the oxygen pipeline 11 is connected with an oxygen replenishing pipeline 12.
In the oxidative polymerization-degradation system, pulp raw materials and alkali liquor are added into an impregnating barrel I1, and then are stirred to form pulp porridge, alkali cellulose is generated and then is conveyed to a squeezer 2 for pulp and alkali separation, wherein the alkali liquor enters a large production system for recycling, and the alkali cellulose enters a spiral mixer 3. The spiral mixer 3 is connected with an alkali liquor replenishing pipeline 6, alkali and alkali cellulose are sheared and mixed through the spiral mixer 3 to form 0-15% concentration pulp porridge, and the pulp porridge enters the medium-concentration pulp porridge mixing barrel 4. The medium-concentration pulp porridge mixing barrel 4 is of a hollow stainless steel structure, the medium-concentration pulp porridge mixing barrel 4 conveys pulp porridge to the oxygen-alkali reaction kettle 5 through a conveying pump and a pipeline II8, a steam pipeline 9 and an oxygen pipeline 11 are arranged on the pipeline II8, and steam and high-concentration gaseous oxygen can be respectively input into the two pipelines at the same time. Wherein, the steam is introduced into the steam pipeline 9 through the steam supplying pipeline 10 for heating the porridge, and the oxygen is introduced into the oxygen pipeline 11 through the oxygen supplying pipeline 12 for providing necessary oxygen supply for cellulose polymerization reduction reaction, so as to be convenient for participating in chemical reaction.
Finally, the gruel enters an oxygen-alkali reaction kettle 5, a multi-layer stirring mechanism 15 is arranged in the oxygen-alkali reaction kettle 5, and steam, oxygen and gruel are mixed to perform an oxygen-alkali reaction from bottom to top.
Example 2
This embodiment is a further optimization on the basis of embodiment 1, with the difference that the material outlet end of the press 2 is provided with a crushing mechanism 13, see fig. 2.
During actual production, the multi-stage crushing structure can be designed according to the on-site situation, so that the production requirement is met while the efficiency is improved.
Example 3
Compared with the embodiments 1-2, the difference is that the spiral mixer 3 is a pipe-type spiral mixer 3, referring to fig. 2, a plurality of lye inlets 14 are provided on the spiral mixer 3, and the spiral mixer 3 is connected with the lye supply line 6 through the lye inlets 14.
In this embodiment, the alkali solution can be added to the alkali cellulose in sections by the spiral mixer 3 provided with a plurality of alkali solution inlets 14, and then the effect of fully mixing is achieved, so that the problem of uneven product quality caused by excessive local alkali solution is avoided.
Example 4
Compared with the embodiments 1-3, the difference of the embodiment is that the medium-consistency porridge mixing barrel 4 is a vertical mixer, and referring to fig. 3, the upper end of the medium-consistency porridge mixing barrel 4 is provided with a feed inlet I4.1, the lower end is provided with a discharge outlet I4.2, and a stirring mechanism 15 of 4-8 layers of spiral stirring blades is arranged in the medium-consistency porridge mixing barrel 4.
Example 5
Compared with embodiments 1-4, the difference between this embodiment and this embodiment is that the spiral mixer 3 and the medium-concentration porridge mixing tub 4 are in an integrated structure, and the discharge end of the spiral mixer 3 is communicated with the feed end of the medium-concentration porridge mixing tub 4, referring to fig. 4. The integrated structure occupies a relatively small area, and can adjust the concentration of the porridge by controlling the flow of the alkali liquor, and meanwhile, the integrated structure has the function of fully mixing the alkali liquor and the cellulose, and the spiral blade also realizes the conveying function of the material.
Example 6
Compared with the embodiments 1-5, the difference of this embodiment is that the steam pipe 9 is close to the medium-concentration porridge mixing tub 4, and the oxygen pipe 11 is disposed at the rear end of the steam pipe 9, referring to fig. 4.
Example 7
Compared with embodiments 1-6, the difference between this embodiment and this embodiment is that the steam pipe 9 is provided with a plurality of steam inlets 16, and referring to fig. 4, the steam pipe 9 is connected to the steam supply line 10 through the steam inlets 16. In this embodiment, steam is supplemented into the porridge in the steam pipeline 9 in a partitioning manner, so that the temperature of the materials is uniform, and the influence on the quality of the final product due to local overheating is avoided.
Example 8
Compared with embodiments 1-7, the difference between this embodiment and this embodiment is that the bottom of the medium-concentration porridge mixing drum 4 is provided with a porridge pump 17, refer to fig. 4.
Example 9
Compared with the embodiments 1-8, the difference is that the discharging end of the oxygen alkali reaction kettle 5 is connected with the dipping barrel II19 through the pipeline III18, and the dipping barrel II19 is connected with the alkali liquor replenishing pipeline 6, referring to FIG. 4. Organic or inorganic impurities generated after cellulose passes through an oxygen-alkali reaction kettle 5 are dissolved in alkali liquor, and the alkali liquor and the cellulose are separated through a squeezer 2, so that the quality of the cellulose is improved, and the preparation quality of alkali fibers is improved.
Example 10
In order to facilitate the public understanding of the present solution, this embodiment will be further described with reference to the drawings by taking a preferable oxidative degradation system for producing fibers as an example.
Referring to fig. 5, the oxidative polymerization-reducing system comprises an impregnating vat I1, a squeezer 2, a spiral mixer 3, a medium-thick-pulp porridge mixing vat 4 and an oxygen-alkali reaction kettle 5, wherein the impregnating vat I1 is connected with an alkali liquor replenishing pipeline 6, the impregnating vat I1 is connected with an inlet of the squeezer 2 through a pipeline I7, a material outlet of the squeezer 2 is communicated with the inlet of the spiral mixer 3, an outlet of the spiral mixer 3 is communicated with the medium-thick-pulp porridge mixing vat 4, the medium-thick-pulp porridge mixer is connected with the oxygen-alkali reaction kettle 5 through a pipeline II8, a steam pipeline 9 and an oxygen pipeline 11 are arranged on the pipeline II8,
The spiral mixer 3 is connected with an alkali liquor replenishing pipeline 6, the steam pipeline 9 is connected with a steam replenishing pipeline 10, and the oxygen pipeline 11 is connected with an oxygen replenishing pipeline 12.
In this embodiment, the material outlet end of the squeezer 2 is provided with a pulverizing mechanism 13.
In this embodiment, the spiral mixer 3 is a pipe-type spiral mixer 3, a plurality of alkali liquor inlets 14 are arranged on the spiral mixer 3, and the spiral mixer 3 is connected with the alkali liquor replenishing pipeline 6 through the alkali liquor inlets 14.
In the embodiment, the medium-concentration porridge mixing barrel 4 is a vertical mixer, the upper end of the medium-concentration porridge mixing barrel 4 is provided with a feed inlet I4.1, the lower end of the medium-concentration porridge mixing barrel is provided with a discharge outlet I4.2, and a stirring mechanism 15 with 4-6 layers of spiral stirring blades is arranged in the medium-concentration porridge mixing barrel 4.
In this embodiment, the spiral mixer 3 and the medium-consistency porridge mixing barrel 4 are of an integrated structure, and the discharge end of the spiral mixer 3 is communicated with the feed end of the medium-consistency porridge mixing barrel 4.
In the embodiment, the steam pipeline 9 is close to the medium-concentration porridge mixing barrel 4, and the oxygen pipeline 11 is arranged at the rear end of the steam pipeline 9.
In this embodiment, the steam pipe 9 is provided with a plurality of steam inlets 16, and the steam pipe 9 is connected to the steam supply line 10 through the steam inlets 16. In practical application, a stirring mechanism which is biased to discharge materials can be arranged in the oxygen-alkali reaction kettle 5 according to the requirements.
In this embodiment, a porridge pump 17 is disposed at the bottom of the medium-concentration porridge mixing drum 4.
In this embodiment, the discharge end of the oxygen alkali reaction kettle 5 is connected with an impregnating vessel II19 through a pipeline III18, and the impregnating vessel II19 is connected with an alkali liquor replenishing pipeline 6.
In this example, referring to FIG. 5, the lye is sourced from an alkaline station 20, the steam is sourced from a steam station 21, and the oxygen is sourced from an oxygen station 22. Pulp raw material and alkali liquor are added into an impregnating barrel I1, and are stirred to form pulp porridge, after alkali cellulose is generated, the pulp porridge is conveyed to a squeezer 2 through a pump to carry out pulp and alkali separation, wherein the alkali liquor enters a large production system for recycling, and the alkali cellulose is crushed by a crushing mechanism 13 and enters a spiral mixer 3. The spiral mixer 3 is provided with a plurality of alkali liquor inlets 14, the alkali liquor inlets 14 are connected with an alkali liquor replenishing pipeline 6, and a flowmeter and an electromagnetic valve can be designed on the alkali liquor replenishing pipeline 6 to controllably input alkali liquor. And shearing and mixing alkali and alkali cellulose by a spiral mixer 3 to form 0-15% concentration pulp porridge, and feeding the pulp porridge into a medium-concentration pulp porridge mixing barrel 4. The medium-concentration pulp porridge mixing barrel 4 is of a hollow stainless steel structure, a pulp porridge pump 17 is arranged at the lower end of the medium-concentration pulp porridge mixing barrel 4, the pump with a double-head spiral structure inside is selected by the pulp porridge pump 17, self-suction force and shearing force are formed through high-speed rotation, the pulp porridge is pushed to flow to the next working procedure through the self-suction force, and the shearing force can effectively mix the pulp porridge, so that uniformity is ensured.
In this embodiment, the spiral mixer 3 and the medium-consistency pulp porridge mixing barrel 4 are of an integrated structure, and the discharge end of the spiral mixer 3 is communicated with the feed end of the medium-consistency pulp porridge mixing barrel 4, so that the structure is ingenious and the occupied area is small.
The porridge is conveyed to the oxygen-alkali reaction kettle 5 through a porridge pump 17, the porridge pump 17 is connected with the oxygen-alkali reaction kettle 5 through a pipeline II8, a steam pipeline 9 and an oxygen pipeline 11 are arranged between the two pipelines, and steam and high-concentration gaseous oxygen can be respectively input into the two pipelines at the same time. Wherein, the steam is introduced into the steam pipeline 9 through the steam supplying pipeline 10 for heating the porridge, and the oxygen is introduced into the oxygen pipeline 11 through the oxygen supplying pipeline 12 for providing necessary oxygen supply for cellulose polymerization reduction reaction, so as to be convenient for participating in chemical reaction.
Finally, the gruel enters an oxygen-alkali reaction kettle 5, a multi-layer stirring mechanism 15 is arranged in the oxygen-alkali reaction kettle 5, and steam, oxygen and gruel are mixed to perform an oxygen-alkali reaction from bottom to top.
Claims (9)
1. An oxidation polymerization reducing system for producing fibers is characterized by comprising an impregnating barrel I (1), a squeezer (2), a spiral mixer (3), a medium-thick-pulp porridge mixing barrel (4) and an oxygen-alkali reaction kettle (5), wherein the impregnating barrel I (1) is connected with an alkali liquor replenishing pipeline (6), the impregnating barrel I (1) is connected with an inlet of the squeezer (2) through a pipeline I (7), a material outlet of the squeezer (2) is communicated with an inlet of the spiral mixer (3), an outlet of the spiral mixer (3) is communicated with the medium-thick-pulp porridge mixing barrel (4), the thick-pulp porridge mixer is connected with the oxygen-alkali reaction kettle (5) through a pipeline II (8), a steam pipeline (9) and an oxygen pipeline (11) are arranged on the pipeline II (8),
The spiral mixer (3) is connected with an alkali liquor replenishing pipeline (6), the steam pipeline (9) is connected with a steam replenishing pipeline (10), and the oxygen pipeline (11) is connected with an oxygen replenishing pipeline (12).
2. An oxidative degradation system for producing fibers according to claim 1, characterized in that the material outlet end of the press (2) is provided with a crushing mechanism (13).
3. An oxidative degradation system for producing fibers according to claim 1, characterized in that the spiral mixer (3) is a pipe-type spiral mixer, a plurality of lye inlets (14) are arranged on the spiral mixer (3), and the spiral mixer (3) is connected with a lye supply line (6) through the lye inlets (14).
4. The oxidation and polymerization reduction system for producing fibers according to claim 1 is characterized in that the medium-consistency porridge mixing barrel (4) is a vertical mixer, a feed inlet I (4.1) is arranged at the upper end of the medium-consistency porridge mixing barrel (4), a discharge outlet I (4.2) is arranged at the lower end of the medium-consistency porridge mixing barrel, and a stirring mechanism (15) with 4-8 layers of spiral stirring blades is arranged in the medium-consistency porridge mixing barrel (4).
5. The oxidative degradation system for producing fibers according to claim 1, wherein the spiral mixer (3) and the medium-concentration porridge mixing barrel (4) are of an integrated structure, and the discharge end of the spiral mixer (3) is communicated with the feed end of the medium-concentration porridge mixing barrel (4).
6. An oxidative degradation system for producing fibers according to claim 1, characterized in that the steam pipe (9) is located close to the medium consistency porridge mixing drum (4), and that the oxygen pipe (11) is arranged at the rear end of the steam pipe (9).
7. An oxidative degradation system for producing fibers according to claim 5, characterized in that the steam pipe (9) is provided with a plurality of steam inlets (16), the steam pipe (9) being connected to the steam supply line (10) via the steam inlets (16).
8. The oxidative degradation polymerization system for producing fibers according to claim 1, wherein a porridge pump (17) is arranged at the bottom of the medium-concentration porridge mixing barrel (4).
9. The oxidative polymerization-reduction system for producing fibers according to claim 1, wherein the discharge end of the oxygen-alkali reaction kettle (5) is connected with an impregnating vessel II (19) through a pipeline III (18), and the impregnating vessel II (19) is connected with an alkali liquor replenishing pipeline (6).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202423173650.4U CN223818562U (en) | 2024-12-23 | 2024-12-23 | Oxidation polymerization reducing system for producing fibers |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202423173650.4U CN223818562U (en) | 2024-12-23 | 2024-12-23 | Oxidation polymerization reducing system for producing fibers |
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| CN223818562U true CN223818562U (en) | 2026-01-23 |
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| CN202423173650.4U Active CN223818562U (en) | 2024-12-23 | 2024-12-23 | Oxidation polymerization reducing system for producing fibers |
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