CN113171685A - Reverse osmosis membrane manufacturing method and device - Google Patents
Reverse osmosis membrane manufacturing method and device Download PDFInfo
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- CN113171685A CN113171685A CN202110385657.4A CN202110385657A CN113171685A CN 113171685 A CN113171685 A CN 113171685A CN 202110385657 A CN202110385657 A CN 202110385657A CN 113171685 A CN113171685 A CN 113171685A
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- reverse osmosis
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D61/00—Processes of separation using semi-permeable membranes, e.g. dialysis, osmosis or ultrafiltration; Apparatus, accessories or auxiliary operations specially adapted therefor
- B01D61/02—Reverse osmosis; Hyperfiltration ; Nanofiltration
- B01D61/025—Reverse osmosis; Hyperfiltration
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D67/00—Processes specially adapted for manufacturing semi-permeable membranes for separation processes or apparatus
- B01D67/0002—Organic membrane manufacture
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D69/00—Semi-permeable membranes for separation processes or apparatus characterised by their form, structure or properties; Manufacturing processes specially adapted therefor
- B01D69/10—Supported membranes; Membrane supports
- B01D69/105—Support pretreatment
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D71/00—Semi-permeable membranes for separation processes or apparatus characterised by the material; Manufacturing processes specially adapted therefor
- B01D71/06—Organic material
- B01D71/56—Polyamides, e.g. polyester-amides
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- Separation Using Semi-Permeable Membranes (AREA)
Abstract
The invention relates to a manufacturing method and equipment of a reverse osmosis membrane, which comprises the following steps: s1, sending out the non-woven fabric from the unreeling machine, then coating the non-woven fabric with water-permeable microporous polysulfone as a supporting layer, and adding hot air drying after coating; s2, coating a polyamide material on the supporting layer to serve as a functional layer, and drying the functional layer; and S3, slitting the product obtained in the step S2 according to the required size, and winding the product by a winding machine. The equipment is provided with the unreeling machine, the first spraying mechanism, the hot air mechanism, the second spraying mechanism, the drying mechanism and the strip winding mechanism which are sequentially arranged from upstream to downstream, is suitable for implementing the manufacturing method, has the advantages of simple process steps, short flow, simple equipment structure and high automation degree, accords with industrial production, and improves the production efficiency and the quality of the reverse osmosis membrane.
Description
Technical Field
The invention relates to the technical field of membranes, in particular to a manufacturing method of a reverse osmosis membrane.
Background
Osmosis is a phenomenon in which a solvent moves from a solution having a low solute concentration to another solution having a high solute concentration through a semi-permeable separation membrane separating the two solutions. In this case, the pressure acting on the solution having a high solute concentration by the movement of the solvent is referred to as osmotic pressure. However, when an external pressure higher than the osmotic pressure level is applied, the solvent moves to a solution having a low solute concentration, and this phenomenon is called reverse osmosis. According to the principle of reverse osmosis, various types of salts or organic substances can be separated by means of a semipermeable membrane using a pressure gradient as driving force. Reverse osmosis membranes, which utilize the reverse osmosis phenomenon, have been used to separate substances at a molecular level, remove salts from salt water or seawater, and provide water for domestic, commercial, and industrial use.
The common reverse osmosis membrane generally comprises a non-woven fabric, a supporting layer (a porous polysulfone layer) sprayed on the non-woven fabric and a polyamide functional layer arranged on the supporting layer, wherein the porous polysulfone layer is low in porosity and fixed in structure, so that the interfacial polymerization reaction is slow when the polyamide layer is prepared, the formed polyamide layer is loose and thick, and the water flux and the desalination rate are low. The existing manufacturing method of the reverse osmosis membrane has the defects of high cost, complex process, limited performance improvement and the like. Therefore, a manufacturing method and equipment of the reverse osmosis membrane which are easy for industrial production and meet the industrial utilization are developed.
Disclosure of Invention
The invention aims to provide a manufacturing method and equipment of a reverse osmosis membrane, which well overcome the defects of the prior art and improve the production efficiency and quality.
In order to achieve the above object, the present invention provides a method for manufacturing a reverse osmosis membrane, which uses a non-woven fabric as a base material in a roll-to-roll production environment, comprising the steps of:
s1, sending out the non-woven fabric from the unreeling machine, then coating the non-woven fabric with water-permeable microporous polysulfone as a supporting layer, and adding hot air drying after coating;
s2, coating a polyamide material on the supporting layer to serve as a functional layer, and drying the functional layer;
and S3, slitting the product obtained in the step S2 according to the required size, and winding the product by a winding machine.
In the above scheme, the step S1 of coating the water-permeable microporous polysulfone and the step S2 of coating the polyamide material are both performed in a spraying manner, and the spraying amount is adjusted by air pressure of an air pump.
The scheme is further that the functional layer is dried by rolling and drying through a hot oil internal heating type heating roller.
In order to achieve the above object, the present invention provides an apparatus for manufacturing a reverse osmosis membrane, comprising:
an unreeling machine that continuously unreels a non-woven fabric so as to be used for manufacturing a reverse osmosis membrane;
the first spraying mechanism is arranged at the downstream of the unreeling machine and is used for spraying the water-permeable microporous polysulfone on the surface of the non-woven fabric;
the hot air mechanism is arranged at the downstream of the first spraying mechanism and sends hot air to dry the water-permeable microporous polysulfone on the non-woven fabric;
the second spraying mechanism is arranged at the downstream of the hot air mechanism and is used for spraying polyamide materials on the water-permeable microporous polysulfone;
the drying mechanism is arranged at the downstream of the second spraying mechanism and is used for drying the polyamide material;
the strip winding mechanism is arranged at the downstream of the drying mechanism and used for separating and winding the product according to the required size.
The first spraying mechanism is provided with a plurality of first material guiding pipes, one end of each first material guiding pipe is provided with a first nozzle, and the first nozzle sprays the water-permeable microporous polysulfone towards the non-woven fabric; the other end of the first material guiding pipe is connected with the distributor; the second spraying mechanism is provided with a plurality of second material guiding pipes, one end of each second material guiding pipe is provided with a second nozzle, and the second nozzles spray polyamide materials towards the non-woven fabric; the other end of the second material guiding pipe is also connected to the distributor; the distributor is internally provided with a plurality of channels, and the distributor is matched with a corresponding air pump to respectively control the spraying amount of the first nozzle and the second nozzle.
The distributor is further assembled on a lifting adjusting seat, and the lifting adjusting seat synchronously adjusts the distance between the first nozzle and the second nozzle or the distance between the first nozzle and the second nozzle and the non-woven fabric.
The scheme is that the drying mechanism is composed of three parallel hot oil internal heating type heating rollers, the surfaces of the hot oil internal heating type heating rollers are smooth, the distance between the three hot oil internal heating type heating rollers meets the requirement that a non-woven fabric sprayed with the polyamide material is penetrated and wound, and the non-woven fabric sprayed with the polyamide material is rolled under certain pressure between the adjacent hot oil internal heating type heating rollers.
According to the scheme, the lifting adjusting seat is driven to lift through a worm and gear lifting structure, and the worm and gear lifting structure drives the lifting adjusting seat to lift according to signals provided by thickness sensors distributed at the drying mechanism.
The method has the advantages of simple process steps, short flow, simple structure of the adopted equipment, high automation degree, suitability for industrial production and improvement of the production efficiency and quality of the reverse osmosis membrane.
Description of the drawings:
FIG. 1 is a schematic structural diagram of a preferred embodiment of the present invention;
FIG. 2 is a schematic view of the embodiment of FIG. 1 from another perspective;
FIG. 3 is an enlarged view of a portion of the embodiment of FIG. 1;
FIG. 4 is an enlarged schematic view of the drying mechanism of the embodiment of FIG. 1;
fig. 5 is a connection diagram of a partial structure of the drying mechanism in the embodiment of fig. 4.
The specific implementation mode is as follows:
the conception, the specific structure and the technical effects of the present invention will be further described with reference to the accompanying drawings to fully understand the objects, the features and the effects of the present invention.
It should be noted that in the description of the present invention, the terms of direction or positional relationship indicated by the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, which are merely for convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and "fourth" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
Referring to fig. 1, 2 and 3, which are schematic views of a preferred embodiment of the present invention, the present invention provides a manufacturing method of a reverse osmosis membrane, which uses a non-woven fabric as a substrate to manufacture the reverse osmosis membrane in a roll-to-roll production environment, so as to obtain continuous production and processing, simplify process steps and shorten flow. The method specifically comprises the following steps:
s1, the non-woven fabric is sent out from the unreeling machine, then the water-permeable microporous polysulfone is coated on the non-woven fabric to be used as a supporting layer, hot air drying is added after the coating, the water-permeable microporous polysulfone is quickly dried and combined on the non-woven fabric, the interval time between processes is shortened, and a stable supporting structure system can be obtained.
S2, coating a polyamide material on the supporting layer to serve as a functional layer, and then drying the functional layer, preferably, the functional layer is dried by rolling and drying through a hot oil internal heating type heating roller, so that the drying effect is achieved, rolling is increased, the product is tighter, the polyamide material is firmer and more uniform in adhesion, the fixing effect is better, the use effect is improved, and the service life is prolonged.
And S3, slitting the product obtained in the step S2 according to the required size, and winding by a winding machine to achieve automatic continuous production.
In the above manufacturing method, in the embodiment, the water-permeable microporous polysulfone is coated in the step S1 and the polyamide material is coated in the step S2 in a spraying manner, and the air pressure of the air pump is used to adjust the spraying amount, so that the spraying is intelligently controlled, and the spraying quality is stable and reliable.
Referring to fig. 1, 2, 3, 4 and 5, which are schematic views of a preferred embodiment of the present invention, aiming at the above manufacturing method, the present invention further provides an apparatus for manufacturing a reverse osmosis membrane, which includes an unreeling machine 1, a first spraying mechanism 2, a hot air mechanism 3, a second spraying mechanism 4, a drying mechanism 5, a strip winding mechanism 6, and a machine base 100 for stable assembly of the mechanisms. The unreeling machine 1 continuously unreels non-woven fabrics so as to be used for manufacturing reverse osmosis membranes, and the unreeling machine 1 realizes automatic unreeling and automatic adjustment and tensioning so as to achieve continuous unreeling production. The first spraying mechanism 2 is disposed downstream of the unwinder 1, and the first spraying mechanism 2 is used to spray water-permeable microporous polysulfone on the surface of the nonwoven fabric to form a support layer. This hot-blast mechanism 3 arranges the low reaches at first spraying mechanism 2, and hot-blast mechanism 3 sends out hot-blast water permeability micropore polysulfone on the dry non-woven fabrics, realizes rapid draing, obtains stable, reliable supporting layer. The hot air mechanism 3 can achieve self-heating and temperature control to obtain dry hot air at a certain temperature, and certainly, the hot air mechanism can also utilize recovered heat to heat, and the specific hot air mechanism 3 can adopt the prior art, and is not described herein again. The second spraying mechanism 4 is arranged at the downstream of the hot air mechanism 3, and the second spraying mechanism 4 is used for spraying polyamide material on the water-permeable microporous polysulfone to obtain a functional layer; the drying mechanism 5 is arranged at the downstream of the second spraying mechanism 4, and the drying mechanism 5 dries the polyamide material to dry, adhere and fix the polyamide material. This branch strip winding mechanism 6 arranges in the low reaches of stoving mechanism 5, and branch strip winding mechanism 6 is used for dividing the strip and the rolling to the product according to required size. In this embodiment, slitting winding mechanism 6 adopts the hobbing mode slitting, and is convenient, swift, and simple structure, and slitting winding mechanism 6 realizes that the rolling of produced reverse osmosis membrane is deposited. The whole equipment has simple structure and high automation degree, and is suitable for industrial production.
Referring to fig. 1, 2 and 3, in the embodiment, the first spraying mechanism 2 has a plurality of first material guiding pipes 21, one end of the first material guiding pipes 21 is provided with a first nozzle 22, and the first nozzle 22 sprays water-permeable microporous polysulfone toward the non-woven fabric; the other end of the first material guiding pipe 21 is connected with the distributor 7; the second spraying mechanism 4 is provided with a plurality of second material guiding pipes 41, one end of each second material guiding pipe 41 is provided with a second nozzle 42, and the second nozzles 42 spray polyamide materials towards the non-woven fabric; and the other end of the second material guiding pipe 41 is also connected to the distributor 7, so that the first material guiding pipe 21 and the second material guiding pipe 41 are arranged in a cantilever manner at the front end and the rear end of the distributor 7. The distributor 7 is provided with a plurality of flow channels therein, the distributor 7 further cooperates with a corresponding air pump to control the spraying amount of the first nozzle 22 and the second nozzle 42, and the specific air pressure control of the air pump is prior art and will not be described herein again. The structure realizes compact integration of the equipment structure, and optimized assembly and control implementation. In this embodiment, the distributor 7 is assembled on the lifting adjusting seat 8, and the lifting adjusting seat 8 synchronously adjusts the distance between the first nozzle 22 and the second nozzle 42 or the distance between the first nozzle and the second nozzle 42 and the non-woven fabric, so as to adjust the thickness of the coated layer after spraying, which is favorable for controlling the production and obtaining the reverse osmosis membrane with excellent quality. Still further, in this embodiment, the elevation adjustment base 8 is disposed at a portal frame provided by the base 100 and is driven to ascend and descend by a worm and gear elevating structure 81, and the worm and gear elevating structure 81 drives the elevation adjustment base 8 to ascend and descend according to a signal provided by a thickness sensor disposed at the drying mechanism 5. The thickness sensor can be infrared sensing or pressure sensing and other mode components and parts, and can be specifically purchased and configured from the market according to actual conditions, and the principle of thickness sensing is not repeated here.
Referring to fig. 1, 2 and 3, in this embodiment, the drying mechanism 5 is composed of three parallel hot oil internal heating rollers 51, the surfaces of the hot oil internal heating rollers 51 are smooth, the distance between the three hot oil internal heating rollers 51 satisfies that the non-woven fabric sprayed with the polyamide material passes through and bypasses, so that the product is attached to the surfaces of the hot oil internal heating rollers 51 for drying, and the adjacent hot oil internal heating rollers 51 roll the non-woven fabric sprayed with the polyamide material at a certain pressure, so that the product has a tighter structure, the polyamide material is more firmly and uniformly adhered, the fixing effect is better, the use efficiency is improved, and the service life is prolonged. As shown in fig. 4 and 5, in the present embodiment, the moving sequence of the reverse osmosis membrane on the three internal heating hot oil heating rollers 51 is defined as a first internal heating hot oil heating roller 51A, a second internal heating hot oil heating roller 51B, and a third internal heating hot oil heating roller 51C, the first internal heating hot oil heating roller guides the movement toward or away from the second internal heating hot oil heating roller in the horizontal direction by the first adjustment mechanism 52; the third internal heat-heated oil heating roller is guided to move closer to or farther from the second internal heat-heated oil heating roller in the horizontal direction by a second adjustment mechanism 53. Further, the first adjusting mechanism 52 includes a first sliding seat 521 and a cylinder 522, and the first sliding seat 521 is assembled on the frame 100 through a rail structure and connected to the end of the first internal heating oil roller. In this embodiment, the two ends of the first hot oil internal heating type heating roller are driven by the two sets of first adjusting mechanisms 52 for movement adjustment, which is convenient for assembly and adjustment. The cylinder 522 is fixed on the base, and the telescopic end of the cylinder 522 is connected with the first sliding seat 521, so that the cylinder 522 drives the first sliding seat 521 to reciprocate, and therefore, the gap between the first hot oil internal heating roller and the second hot oil internal heating roller is adjusted, the corresponding rolling force is obtained, and the drying and pressing effects are improved. In this embodiment, the first sliding base 521 is disposed upright, and a leaning slope 5211 is disposed on a side of the first sliding base 521 close to the second hot oil internal heating roller, the leaning slope 5211 abuts against the adjusting slope 54, and the adjusting slope 54 is assembled on the base and can move relatively. The working gap between the first hot oil internal heating type heating roller and the second hot oil internal heating type heating roller is determined by adjusting the inclined block 54, the structure is simple, the adjustment is convenient, and the gap is stable and accurate. In this embodiment, in order to promote the stable movement of the first sliding seat 521 on the base, the first sliding seat 521 is further provided with a sliding limiting groove 5212, and a sliding limiting block 101 preset on the base extends into the sliding limiting groove 5212, and the two are matched to work, so that the movement of the first sliding seat 521 is effectively assisted, and the adjustment stability and accuracy are promoted. In this embodiment, the adjusting inclined block 54 is assembled on the base and is formed in a vertical shape, an adjusting screw 541 is disposed at the upper end of the adjusting inclined block 54, and the adjusting screw 541 passes through a through hole preset in the base and is then connected to an adjusting nut 542, so that the adjusting nut 542 is rotated to drive the adjusting inclined block 54 to ascend and descend. Simple structure, convenient preparation and equipment, also convenient to use and maintain. The second adjusting mechanism 53 includes a second sliding seat 531 and an adjusting bolt 532, the second sliding seat 531 is assembled on the base through a guide rail structure and connected to the end of the third hot oil internal heating type heating roller, the adjusting bolt 532 is assembled on the base, and one end of the adjusting bolt 532 is connected to the second sliding seat 531, so that the second sliding seat 531 is driven to move by screwing in or screwing out the adjusting bolt 532, and the assembly and the adjustment are convenient.
In this embodiment, the product after drying mechanism 5 still passes through air cooling mechanism 9 and cools down to the follow-up slitting rolling. The air cooling mechanism 9 of the embodiment is composed of a plurality of guide rollers which are arranged in a staggered mode, so that the moving path of a product is increased, and better air cooling aging is obtained.
The method has the advantages of simple process steps, short flow, simple structure of the adopted equipment, high automation degree, suitability for industrial production and improvement of the production efficiency and quality of the reverse osmosis membrane.
It is to be understood that the foregoing detailed description of the present invention has been provided only for the purpose of illustrating the technical spirit and features of the present invention, and the present invention is not limited thereto.
Claims (8)
1. A manufacturing method of a reverse osmosis membrane is characterized by comprising the following steps: the manufacturing method is to manufacture the reverse osmosis membrane by taking non-woven fabrics as a base material in a roll-to-roll production environment, and comprises the following steps:
s1, sending out the non-woven fabric from the unreeling machine, then coating the non-woven fabric with water-permeable microporous polysulfone as a supporting layer, and adding hot air drying after coating;
s2, coating a polyamide material on the supporting layer to serve as a functional layer, and drying the functional layer;
and S3, slitting the product obtained in the step S2 according to the required size, and winding the product by a winding machine.
2. The method for manufacturing a reverse osmosis membrane according to claim 1, comprising the steps of: the step S1 of coating the water-permeable microporous polysulfone and the step S2 of coating the polyamide material are both in a spraying form, and the spraying amount is adjusted by the air pressure of an air pump.
3. The method for manufacturing a reverse osmosis membrane according to claim 1, comprising the steps of: and the functional layer is dried by rolling and drying through a hot oil internal heating type heating roller.
4. An apparatus for manufacturing a reverse osmosis membrane, comprising:
an unreeling machine (1), wherein the unreeling machine (1) continuously unreels non-woven fabric so as to be used for manufacturing a reverse osmosis membrane;
a first spraying mechanism (2), the first spraying mechanism (2) is arranged at the downstream of the unreeling machine (1), and the first spraying mechanism (2) is used for spraying water-permeable microporous polysulfone on the surface of the non-woven fabric;
the hot air mechanism (3), the hot air mechanism (3) is arranged at the downstream of the first spraying mechanism (2), and the hot air mechanism (3) sends out hot air to dry the water-permeable microporous polysulfone on the non-woven fabric;
a second spraying mechanism (4), the second spraying mechanism (4) is arranged at the downstream of the hot air mechanism (3), and the second spraying mechanism (4) is used for spraying polyamide materials on the water-permeable microporous polysulfone;
a drying mechanism (5), wherein the drying mechanism (5) is arranged at the downstream of the second spraying mechanism (4), and the drying mechanism (5) dries the polyamide material;
the strip-dividing and winding mechanism (6) is arranged at the downstream of the drying mechanism (5), and the strip-dividing and winding mechanism (6) is used for dividing and winding the product according to the required size.
5. The equipment for manufacturing a reverse osmosis membrane according to claim 4, wherein the first spraying mechanism (2) is provided with a plurality of first material guiding pipes (21), one end of each first material guiding pipe (21) is provided with a first nozzle (22), and the first nozzle (22) sprays the water-permeable microporous polysulfone towards the non-woven fabric; the other end of the first material guiding pipe (21) is connected with the distributor (7); the second spraying mechanism (4) is provided with a plurality of second material guiding pipes (41), one end of each second material guiding pipe (41) is provided with a second nozzle (42), and the second nozzle (42) sprays the polyamide materials towards the non-woven fabric; the other end of the second material guiding pipe (41) is also connected to the distributor (7); the distributor (7) is internally provided with a plurality of channels, and the distributor (7) is matched with a corresponding air pump to respectively control the spraying amount of the first nozzle (22) and the second nozzle (42).
6. The apparatus for manufacturing a reverse osmosis membrane according to claim 5, wherein the distributor (7) is assembled on an elevation adjustment base (8), and the elevation adjustment base (8) synchronously adjusts the distance between the first nozzle (22) and the second nozzle (42) and the non-woven fabric.
7. The apparatus for manufacturing a reverse osmosis membrane according to claim 4, wherein the drying mechanism (5) is composed of three hot oil internally heated heating rollers (51) arranged in parallel, the surfaces of the hot oil internally heated heating rollers (51) are smooth, the distance between the three hot oil internally heated heating rollers (51) is such that the non-woven fabric sprayed with the polyamide material is passed through and wound, and the non-woven fabric sprayed with the polyamide material is rolled with a certain pressure between the adjacent hot oil internally heated heating rollers (51).
8. The equipment for manufacturing the reverse osmosis membrane is characterized in that the lifting adjusting seat (8) is driven to lift through a worm and gear lifting structure (81), and the worm and gear lifting structure (81) drives the lifting adjusting seat (8) to lift according to signals provided by a thickness sensor arranged at the drying mechanism (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202110385657.4A CN113171685A (en) | 2021-04-10 | 2021-04-10 | Reverse osmosis membrane manufacturing method and device |
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| CN202110385657.4A CN113171685A (en) | 2021-04-10 | 2021-04-10 | Reverse osmosis membrane manufacturing method and device |
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| CN202110385657.4A Pending CN113171685A (en) | 2021-04-10 | 2021-04-10 | Reverse osmosis membrane manufacturing method and device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113338052A (en) * | 2021-08-03 | 2021-09-03 | 湖南沁森高科新材料有限公司 | Seawater desalination membrane and preparation method thereof |
| CN115108156A (en) * | 2022-07-04 | 2022-09-27 | 江苏省瑞达包装有限公司 | High-barrier packaging bag and production process thereof |
-
2021
- 2021-04-10 CN CN202110385657.4A patent/CN113171685A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113338052A (en) * | 2021-08-03 | 2021-09-03 | 湖南沁森高科新材料有限公司 | Seawater desalination membrane and preparation method thereof |
| CN115108156A (en) * | 2022-07-04 | 2022-09-27 | 江苏省瑞达包装有限公司 | High-barrier packaging bag and production process thereof |
| CN115108156B (en) * | 2022-07-04 | 2023-09-15 | 江苏省瑞达包装有限公司 | Production process of high-barrier packaging bag |
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