CN214458462U - Dry-process glue making device for lyocell fiber production - Google Patents
Dry-process glue making device for lyocell fiber production Download PDFInfo
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Abstract
The utility model belongs to the technical field of fiber manufacturing, dry pulping and glue making process, and relates to a dry glue making device for lyocell fiber production. The separating machine and the tractor are respectively connected with a powerful shredder, the powerful shredder is connected with a first conveying fan, the first conveying fan is connected with a cyclone separator, the cyclone separator is connected with a universal crusher, the universal crusher is connected with a second conveying fan, the second conveying fan is connected with a screening machine, the screening machine is respectively connected with a second cyclone separator and the universal crusher, the second cyclone separator is respectively connected with a phoenix tail filter and a weighing bin, the weighing bin is connected with an unloader, the unloader is connected with a weighing belt device, the weighing belt device is connected with a premixer, the premixer is connected with a cache bin, the cache bin is connected with a film evaporator, the phoenix tail filter is respectively connected with an exhaust fan and a feeding conveying fan, the exhaust fan is connected with a tail air emptying pipeline, the feeding conveying fan is connected with a first cyclone separator, and the first cyclone separator is connected with the weighing bin.
Description
Technical Field
The utility model belongs to the technical field of fiber manufacturing, dry pulping and glue making process, and relates to a dry glue making device for lyocell fiber production.
Background
Cellulose is a main component of plant cell walls, can be derived from trees, cotton, hemp and other plants, and is widely distributed, inexhaustible and inexhaustible in nature. Generally, most organic substances containing hydroxyl groups are readily soluble in water, such as alcohol, glucose, and the like, but cellulose is insoluble in water and most organic solvents. The molecular weight of cellulose is generally large, and is hundreds of low, and is tens of thousands of high, and intramolecular and intermolecular hydrogen bonds are easily formed, and the acting force covers the affinity action of a part of hydroxyl groups to water, so that the cellulose is insoluble in water or common organic solvents.
As petroleum resources are gradually reduced and influenced by factors such as the consciousness of advocating nature, health and environmental protection, people gradually turn to regenerated cellulose fibers. Lyocell fiber (Lyocell) is commonly called as "velveteen", is made from natural plant fiber as a raw material, is known in the middle of the 90 s of the 20 th century, and is known as the most valuable product in artificial fiber history in the last half century. The Lyocell fiber has various excellent performances of natural fiber and synthetic fiber, Lyocell is green fiber, raw materials of Lyocell are inexhaustible cellulose in nature, a production process has no chemical reaction, a used solvent is nontoxic, the recovery rate of the solvent can reach more than 99%, and the production process is green and environment-friendly, so the Lyocell fiber is called as '21 st century green fiber'.
The lyocell fiber production technology is a relatively mature solvent method regenerated cellulose fiber industrialized production technology at present, and domestic and foreign enterprises, colleges and scientific research institutions have more relevant researches, but relatively few lyocell fiber complete production technologies can be really mastered, and as a foreign enterprise which monopolizes the lyocell fiber production technology for a long time, the lyocell fiber production technology mastered a series of most advanced lyocell fiber relevant technologies such as lyocell fiber production equipment and production technology, breaks through the blockade of the production technology and equipment by the foreign enterprise, develops a mature and reliable lyocell fiber production technology and equipment, and can powerfully promote the development of the field of new fiber materials.
At present, a lyocell production factory in China adopts a wet glue making production process, namely, raw material pulp is subjected to hydraulic disintegration by using hydraulic pulper equipment and is fully mixed with water to form fluid pulp gruel-shaped material with the pulp concentration of about 4% -5%, then the fluid pulp gruel-shaped material is conveyed to squeezer equipment by using a low-concentration pulp pump for extrusion and dehydration to obtain pulp with the dryness of about 45%, then wet pulp is crushed by using a crusher, and organic cellulose NMMO solution is added for full mixing after crushing to prepare glue solution. The wet glue making process has obvious defects that firstly, the pulp dryness fluctuation of the squeezed pulp is large, and the stability is poor, so that the concentration of NMMO (cellulose suspension) of cellulose suspension prepared by mixing the pulp with the NMMO solution fluctuates, and the quality of subsequent glue making and the stability of a finished product are influenced; and secondly, redundant water is brought into a production system, so that the subsequent solvent recovery amount is increased, and the solvent recovery investment cost and the operation cost are increased.
Disclosure of Invention
In order to overcome the defects of the prior art, the utility model provides a dry-process glue preparing device for lyocell fiber production.
A glue making device for a lyocell fiber production dry method is characterized in that a separating machine and a traction machine are respectively connected with a powerful shredder, the powerful shredder is connected with a first conveying fan, the first conveying fan is connected with a cyclone separator, the cyclone separator is connected with a universal crusher, the universal crusher is connected with a second conveying fan, the second conveying fan is connected with a screening machine, the screening machine is respectively connected with a second cyclone separator and a universal crusher, the second cyclone separator is respectively connected with a phoenix tail filter and a weighing bin, the weighing bin is connected with an unloading machine, the unloading machine is connected with a weighing belt device, the weighing belt device is connected with a premixer, the premixer is connected with a cache bin, the cache bin is connected with a film evaporator, the phoenix tail filter is respectively connected with an exhaust fan and a feeding conveying fan, the exhaust fan is connected with a tail air emptying pipeline, the feeding conveying fan is connected with a first cyclone separator, and the first cyclone separator is connected with the weighing bin.
A dry glue making method for lyocell fiber production comprises the following steps:
step 1), a pretreatment step of selecting dissolving pulp, which comprises a plate-type dissolving pulp treatment step or a roll-type dissolving pulp treatment step.
Step 2), strong shredding: the raw material dissolving pulp conveyed in the step 1) enters a traction roller of a strong shredding machine set, is conveyed to a curved surface combined knife roller of the strong shredding machine at a constant speed, and is stripped by a stripping roller and then is sucked away by a first conveying fan.
Step 3), a crushing step: the slurry shredded by the powerful shredder is conveyed to the cyclone separator for separation by the first conveying fan, and the separated slurry enters the tail air dedusting system of the universal shredder.
Step 4), fine powder conveying and dust removing: the slurry crushed by the universal crusher enters a screening machine for screening through a pipeline under the action of a second conveying fan, the qualified material screened by the screening machine is separated by a second cyclone separator and then enters a weighing bin, tail air enters a phoenix tail filter for dust fall treatment under the action of an exhaust fan, is deposited to the lower end of the phoenix tail filter after being swept by pulse compressed air, enters a feeding conveying fan again through the phoenix tail filter, falls into the weighing bin again after passing through a first cyclone separator, and returns to a dust removal system again.
Step 5), NMMO dipping step: the materials which enter the weighing bin and are finely crushed fall to a weighing belt through a star-shaped unloader, the weighed materials are conveyed to a pre-mixer through the weighing belt, the materials and the solvent are fully mixed to generate slurry porridge, and the slurry porridge is conveyed to a buffer storage bin.
Step 6), dissolving pulp: adding the crushed pulp into NMMO solution meeting the requirements of concentration and temperature, fully soaking the pulp in a buffer storage bin and homogenizing to obtain the cellulose suspension.
The utility model has the advantages that:
in the production process of Lyocell, the key point of high-performance fiber production is to prepare a spinning solution which is uniform, has proper viscosity and meets the requirements of various indexes, so the process control in the dissolving process of dissolving pulp is very important, and the finally prepared colloid index is controlled to be nD 50: 0.8-2, cellulose content: 8-14%, NMMO content: 65-85%, N/C: 5.5-8.5, viscosity: 300 to 600 Pa.s.
The paste is scraped and formed into a film in a film evaporator, and a foamless real solution is quickly formed under the action of a certain temperature and vacuum. The utility model discloses the characteristics of technology are that equipment structure is simple relatively, low in manufacturing cost, and is efficient, and the material forms solution time weak point, and the material is made thick liquid congee proportion, moisture content stable, and volatility is little, and the glue solution quality of making is higher, and greatly reduced moreover the possibility of solvolysis is favorable to stabilizing production and improving the quality of products.
Drawings
The invention itself, however, as well as many of the attendant advantages thereof, will be best understood by reference to the following detailed description when considered in connection with the accompanying drawings, wherein like reference numerals indicate like parts throughout the several views, and wherein:
fig. 1 is a schematic flow chart of the present invention.
The present invention will be further explained with reference to the drawings and examples.
Detailed Description
Obviously, many modifications and variations of the present invention based on the spirit of the present invention will be apparent to those skilled in the art.
As used herein, the singular forms "a", "an", "the" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. It will be understood that when an element, component or section is referred to as being "connected" to another element, component or section, it can be directly connected to the other element or section or intervening elements or sections may also be present. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art.
The following examples are further illustrative in combination to facilitate understanding of the embodiments, and are not to be construed as limiting the invention.
Example 1: as shown in figure 1, the dry glue making method for lyocell fiber production improves the glue making quality and the stability of lyocell finished products, reduces the NMMO recovery cost and the investment cost, and comprises the following steps:
step 1), dissolving pulp pretreatment:
comprises a plate-type dissolving pulp processing step and a roll-type dissolving pulp processing step.
Plate-type dissolving pulp treatment: and (4) carrying out single sheet separation conveying by adopting a sheet separator, wherein the conveying capacity of a single machine is 2-5 t/h.
Roll type dissolving pulp treatment: and a tractor is adopted for continuous paper feeding and conveying, the conveying capacity of a single machine is 2-5 t/h, and the moisture requirement of the raw material dissolving pulp is 8-12% in the national standard range.
Step 2), strong shredding:
the raw material dissolving pulp conveyed by the separating machine or the tractor enters a traction roller of a strong shredder set, is conveyed to a curved surface combined knife roller of the strong shredder at a constant speed, is transversely and longitudinally strongly cut and shredded to form fine blocky pulp blocks, and the pulp blocks after being shredded are irregular blocky, have different thicknesses and specifications and have the maximum specification kept within 5 x 5 mm. The pulp after being forcedly shredded is stripped by a stripping roller and then is sucked away by a first conveying fan, and the air volume of the first conveying fan is 1787-1381 m3And h, wind pressure 2560-3641 Pa ensures that the powerful shredding machine set does not accumulate materials, and meanwhile, the first conveying fan plays a role in cooling the inside of the machine set.
Step 3), a crushing step:
the slurry shredded by the powerful shredder is conveyed to the cyclone separator for separation by the first conveying fan, and the separated slurry enters the tail air dedusting system of the universal shredder.
The materials enter the crushing chamber from a universal crusher hopper through a shaking device, centrifugal force generated by high-speed rotation of the movable gear disc is thrown to the chamber wall from the central part, the materials are crushed under the impact, shearing and grinding of steel teeth and the impact among the materials between the movable gear disc and the fixed gear disc, finally the materials reach an annular space on the outer wall of the rotating disc, fine particles are discharged from the bottom through the outer sieve plate, and coarse powder is repeatedly crushed in the crusher.
The universal pulverizer utilizes the high-speed relative motion between the movable fluted disc and the fixed fluted disc to crush the crushed objects through the comprehensive actions of tooth impact, friction, impact among materials and the like.
The crushed material can be directly discharged from a grinding cavity of the main machine, the particle size can be obtained by replacing mesh screens with different apertures, the definite volume weight of the material crushed by the universal crusher is controlled to be 30-50 g/L, and the machine body of the universal crusher adopts a circulating cooling water form for cooling treatment.
Step 4), fine powder conveying and dust removing:
slurry crushed by the universal crusher enters a screening machine for screening through a pipeline under the action of a second conveying fan, the aperture of a screening net is 2-5 mm, qualified materials screened by the screening machine are separated by a second cyclone separator and enter a weighing bin, tail air enters a phoenix tail filter dust collector for dust fall treatment under the action of an exhaust fan, dust is collected on the outer surface of a filter bag when dust-containing gas passes through the phoenix tail filter, and clean gas enters the filter bag through a filter material. The cage inside the bag serves to support the bag against collapse and at the same time it facilitates the removal and redistribution of the dust cake. The cloth bag filtering precision is 5-50 mu m, and tail air filtered by the phoenix tail filter is emptied; the materials collected on the outer surface of the filter bag are deposited to the lower end of the phoenix tail filter after being swept by pulse compressed air, enter the feeding conveying fan again through the unloader, fall into the weighing bin again after being separated by the first cyclone separator, and the tail air returns to the dust removal system again; air quantity 5787-5381 m of feeding and conveying fan3And h, wind pressure 3560-4641 Pa, motor frequency conversion control and system negative pressure adjustment according to the actual condition of the system.
Step 5), NMMO dipping step:
the material entering the fine crushing bin falls to a weighing belt through a star-shaped unloader, the weighed material is conveyed to a premixer through the weighing belt, a plurality of solvent nozzles are arranged on two sides of the premixer, the weighing quantity and a solvent conveying system establish a logical relationship, and the solvent dosage and the material blanking are in a linear proportional relationship, namely when the material blanking is more, a solvent control valve is enlarged, the added solvent dosage is increased, otherwise, when the material blanking dosage is less, the solvent control valve is closed, and the added solvent dosage is also reduced.
The PLC system calculates the adding amount of the solvent according to the weighed weight, the solvent is quantitatively and regularly sprayed into the pre-mixer, the materials and the solvent are fully mixed to generate slurry porridge, and the slurry porridge is conveyed into a cache storage bin. The concentration of the solvent is 65-85%, the temperature of the solvent is 55-85 ℃, the NC ratio is controlled to be 5.5-8.5, a certain amount of antioxidant is added in the preparation of the solvent, and the adding proportion of the antioxidant is 0.5-2 per mill. The N/C ratio, i.e.the ratio of the mass of solvent NMMO to the mass of oven dried cellulose (cell).
Step 6), dissolving pulp:
adding the crushed pulp into NMMO solution meeting the requirements of concentration and temperature, fully soaking the pulp in a buffer storage bin and homogenizing to obtain the cellulose suspension. The activated cellulose is then continuously mixed in a solvent to form a homogeneous suspension, and the slurry is fed into a thin-film evaporator, where the premix is applied at the upper part by means of a centrally positioned rotor and is fed downwards through the thin-film evaporator, the suspension is concentrated by heating under reduced pressure, and the pulp is gradually dissolved and converted into a plastic cellulose solution as the water content decreases. Since the dissolution of NMMO into cellulose is only possible at high concentrations of solvent and the temperature is critical. The dissolution is started by excess of water in the raw material and then gradually removing the water until NMMO and H2The proportion of O meets the requirements. The high concentration solvent is usually about 75-80%.
The process is briefly described as follows: the preparation of domestic and foreign Lyocell fiber spinning solution mainly comprises 4 technologies, namely intermittent kettle type dissolving technology, continuous double-screw extruder dissolving technology, continuous vacuum full-mixing propulsion dissolving technology and continuous vacuum film propulsion dissolving.
The reactor in the process of the utility model is a continuous vacuum film propulsion reactor. The continuous vacuum film pushes the interior of the reactor to be vacuumized, the reactor adopts a jacket type heating mode, the jacket layer is divided into three independent circulating heating areas which are named as an upper heating area, a middle heating area and a lower heating area of the reactor respectively, slurry and porridge enter from the upper part, and the slurry and porridge are discharged from the lower part.
The heating temperature of the upper part of the reactor is controlled to be 45-65 ℃, the temperature of the middle part of the reactor is controlled to be 65-85 ℃, the temperature of the lower part of the reactor is controlled to be 85-105 ℃, and the vacuum degree in the reactor is controlled to be-85-125 bar.
The degree of polymerization of pulp directly affects the dissolution rate of the solvent and the properties of the fiber. The lower the degree of polymerization, the faster the dissolution rate and the better the filtration performance, but the poorer the performance of the cellulose fiber product; the higher the degree of polymerization, the better the properties of the fiber product produced. Factors that have a large influence on the spinnability of the fiber include the dissolution rate of the solution, the filtration performance, and the viscosity of the spinning solution. When the degree of polymerization is the same, wood pulp dissolves faster than cotton pulp in the ammonium oxide solvent (NMMO).
Example 2: as shown in figure 1, the dry-process gluing device for lyocell fiber production comprises a splitting machine and a tractor which are respectively connected with a powerful shredder, the powerful shredder is connected with a first conveying fan, the first conveying fan is connected with a cyclone separator, the cyclone separator is connected with a universal crusher, the universal crusher is connected with a second conveying fan, the second conveying fan is connected with a screening machine, the screening machine is respectively connected with a second cyclone separator and the universal crusher, the second cyclone separator is respectively connected with a phoenix tail filter and a weighing bin, the weighing bin is connected with an unloading machine, the unloading machine is connected with a weighing belt device, the weighing belt device is connected with a premixer, the premixer is connected with a buffer bin, the buffer bin is connected with a film evaporator, the phoenix tail filter is respectively connected with an exhaust fan and a feeding conveying fan, the exhaust fan is connected with a tail air emptying pipeline, the feeding conveying fan is connected with a first cyclone separator, and the first cyclone separator is connected with the weighing bin.
Aiming at a plate type packaging form (plate type dissolving pulp, packaging specification 600 x 800), a separating machine is adopted for single-sheet separation conveying, and the conveying capacity of a single machine is 2-5 t/h;
and (3) aiming at a roll type packaging form (roll type dissolving pulp, the packaging specification phi 1200 x 800) continuous paper feeding and conveying are carried out by adopting a tractor, the conveying capacity of a single machine is 2-5 t/h, and the water content of the raw material dissolving pulp is required to be within 8-12% of the national standard range.
The raw material dissolving pulp conveyed by the separating machine or the tractor enters a traction roller of a strong shredder set, is conveyed to a curved surface combined knife roller of the strong shredder at a constant speed, is transversely and longitudinally strongly cut and shredded to form fine blocky pulp blocks, and the pulp blocks after being shredded are irregular blocky, have different thicknesses and specifications and have the maximum specification kept within 5 x 5 mm. The pulp after being forcedly shredded is stripped by a stripping roller and then is sucked away by a first conveying fan, and the air volume of the first conveying fan is 1787-1381 m3And h, wind pressure 2560-3641 Pa ensures that the powerful shredding machine set does not accumulate materials, and meanwhile, the first conveying fan plays a role in cooling the inside of the machine set.
The slurry shredded by the powerful shredder is conveyed to a cyclone separator for separation by a first conveying fan, and the separated slurry enters a universal shredder. The materials enter the crushing chamber from a universal crusher hopper through a shaking device, centrifugal force generated by high-speed rotation of the movable gear disc is thrown to the chamber wall from the central part, the materials are crushed under the impact, shearing and grinding of steel teeth and the impact among the materials between the movable gear disc and the fixed gear disc, finally the materials reach an annular space on the outer wall of the rotating disc, fine particles are discharged from the bottom through the outer sieve plate, and coarse powder is repeatedly crushed in the crusher. The universal pulverizer utilizes the high-speed relative motion between the movable fluted disc and the fixed fluted disc to crush the crushed objects through the comprehensive actions of tooth impact, friction, impact among materials and the like. Simple structure, firm, operate steadily, crushing respond well, can be directly by discharge in the host computer grinds the chamber, the granularity size obtains through the mesh screen of changing different apertures, the volume weight control of deciding of the material after universal pulverizer smashes is at 30 ~ 50g/L, and the form that adopts recirculated cooling water in the universal pulverizer organism is cooled down and is handled.
Slurry crushed by the universal crusher enters a screening machine for screening through a pipeline under the action of a second conveying fan, the aperture of a screening net is 2-5 mm, qualified materials after being screened by the screening machine are separated by a second cyclone separator and then enter a weighing bin, tail air enters a phoenix tail filter for dust fall treatment under the action of an exhaust fan through the tail air filter, dust is collected on the outer surface of a filter bag when dust-containing gas passes through the phoenix tail filter, and clean gas enters the filter bag through a filter material. The cage inside the bag serves to support the bag against collapse and at the same time it facilitates the removal and redistribution of the dust cake. The cloth bag filtering precision is 5-50 mu m, and tail air filtered by the phoenix tail filter is emptied; the materials collected on the outer surface of the filter bag are deposited to the lower end of the phoenix tail filter after being swept by pulse compressed air, and then enter the feeding and conveying fan again through the unloader, and then fall into the weighing bin again after passing through the first cyclone separator, and the tail air returns to the dust removal system again; air quantity 5787-5381 m of exhaust fan3The wind pressure is 3560-4641 Pa, the motor is controlled by frequency conversion, and the negative pressure of the system can be adjusted according to the actual condition of the system.
The material entering the storage bin and finely crushed falls to a weighing belt through a star-shaped unloader, the weighed material is conveyed to a premixer through the weighing belt, a plurality of solvent spray nozzles are arranged on two sides of the premixer, the weighing quantity and a solvent conveying system establish a logical relation, a PLC system calculates the adding amount of a solvent according to the weighing quantity, the solvent is quantitatively and regularly sprayed into the premixer, the material and the solvent are fully mixed to generate slurry porridge, and the slurry porridge is conveyed to a cache storage bin and a film evaporator. The concentration of the solvent is 65-85%, the temperature of the solvent is 55-85 ℃, the NC ratio is controlled to be 5.5-8.5, a certain amount of antioxidant is added in the preparation of the solvent, and the adding proportion of the antioxidant is 0.5-2 per mill.
Adding the crushed pulp into NMMO solution meeting the requirements of concentration and temperature, fully soaking the pulp in a buffer storage bin and homogenizing to obtain the cellulose suspension. Subsequently, the activated cellulose is linked in a solventMixing to form a uniform suspension, feeding the slurry into a thin film evaporator, applying a premix to the upper part of the evaporator with a centrally located rotor, feeding the premix downwards through the evaporator, heating under reduced pressure to concentrate the suspension, and gradually dissolving the pulp to convert it into a plastic cellulose solution as the water content decreases. Because the dissolution of NMMO to cellulose can only be carried out in a very narrow NMMO/H range2The O can be dissolved only under the condition of the proportion of the mixed solvent, and has strict requirements on the temperature, so the method has the advantages of simple process, low cost and the like. The dissolution is started by excess of water in the raw material and then gradually removing the water until NMMO and H2The proportion of O meets the requirements.
As described above, although the embodiments of the present invention have been described in detail, it will be apparent to those skilled in the art that many modifications are possible without substantially departing from the invention and its effects. Therefore, all such modifications are included in the scope of the present invention.
Claims (1)
1. A dry-process glue making device for lyocell fiber production is characterized in that a splitting machine and a traction machine are respectively connected with a powerful shredding machine, the powerful shredding machine is connected with a first conveying fan, the first conveying fan is connected with a cyclone separator, the cyclone separator is connected with a universal crusher, the universal crusher is connected with a second conveying fan, the second conveying fan is connected with a screening machine, the screening machine is respectively connected with a second cyclone separator and a universal crusher, the second cyclone separator is respectively connected with a phoenix tail filter and a weighing bin, the weighing bin is connected with an unloading machine, the unloading machine is connected with a weighing belt device, the weighing belt device is connected with a pre-mixer, the pre-mixer is connected with a buffer bin, the buffer bin is connected with a film evaporator, the phoenix tail filter is respectively connected with an exhaust fan and a feeding conveying fan, the exhaust fan is connected with a tail air emptying pipeline, and the feeding conveying fan is connected with the first cyclone separator, the first cyclone separator is connected with the weighing bin.
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| CN202120035418.1U CN214458462U (en) | 2021-01-07 | 2021-01-07 | Dry-process glue making device for lyocell fiber production |
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Effective date of registration: 20220311 Address after: 253200 northwest corner of the intersection of West Outer Ring Road and Yincheng Road, Xiajin County Economic Development Zone, De Zhou City, Shandong Province Patentee after: Shandong Hongtai Dingxin Material Technology Co.,Ltd. Address before: 3 / f-045, huannuo building, 1568 South Ring Road, Changhe street, Binjiang District, Hangzhou, Zhejiang 310000 Patentee before: Hangzhou rongkaisheng Technology Co.,Ltd. |
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Denomination of utility model: A dry glue making device for Lyocell fiber production Effective date of registration: 20221227 Granted publication date: 20211022 Pledgee: Xiajin County Caijin Investment Group Co.,Ltd. Pledgor: Shandong Hongtai Dingxin Material Technology Co.,Ltd. Registration number: Y2022980027587 |