CN115339772A - Bidirectional humidity-regulating bag for storing articles and application thereof - Google Patents
Bidirectional humidity-regulating bag for storing articles and application thereof Download PDFInfo
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- CN115339772A CN115339772A CN202111648406.7A CN202111648406A CN115339772A CN 115339772 A CN115339772 A CN 115339772A CN 202111648406 A CN202111648406 A CN 202111648406A CN 115339772 A CN115339772 A CN 115339772A
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- humidity
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- humidity control
- moisture
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D81/00—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents
- B65D81/18—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents providing specific environment for contents, e.g. temperature above or below ambient
- B65D81/22—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents providing specific environment for contents, e.g. temperature above or below ambient in moist conditions or immersed in liquids
Abstract
The invention relates to the field of B01D53/28, in particular to a bidirectional humidifying bag for article preservation and application thereof, which is prepared by wrapping a conditioning agent with a moisture permeable packaging material, has simple preparation process, lower cost, convenient use and high safety, can adjust and control the environmental humidity to be 30-95 percent, and meets the preservation requirement of articles with higher relative humidity requirement on the preservation environment; the size of the bidirectional humidifying bag can be adjusted according to article storage requirements, actual use requirements of different articles are met, and the bidirectional humidifying bag is suitable for large-scale popularization, production and use. The humidifying bag has the advantages that the sodium chloride, the sodium lactate, the potassium chloride and the lithium bromide are used as humidifying components, and the hydrophilic high molecular compound and the packaging material made of a specific material are matched, so that the environment humidity can be effectively adjusted and controlled to be 65-80%, the efficiency is high, the effective use time of the humidifying bag can be prolonged, extra post-treatment is not needed, the resource waste is avoided, and the humidifying bag is particularly suitable for storing dried flowers, cigars and guitars.
Description
Technical Field
The invention relates to the field of B01D53/28, in particular to a bidirectional humidity adjusting bag for article preservation and application thereof.
Background
The preservation of articles such as dried flowers, cigars, guitars and the like requires a relatively high relative humidity of the preservation environment and requires a relatively stable humidity value. Currently, the environmental relative humidity adjustment method can be classified into an active method and a passive method according to whether or not artificial energy is consumed. The active method is mainly the existing heating and ventilation technology and is mainly used for adjusting the humidity of the indoor environment of the goods warehouse. The passive method utilizes the moisture absorption and release characteristics of certain materials to regulate and control the humidity of the environment, has the advantages of energy conservation, stable control, safety and the like, and is particularly suitable for stably controlling the humidity in a relatively closed small environment.
In the prior art, the humidity-adjusting component is required to be coated on the paperboard carrier, the preparation process is complex, the cost is high, the use is inconvenient, the efficiency is low, the resource waste is easily caused, and the article for adjusting the environmental humidity is not suitable for large-scale popularization, production and use; meanwhile, the stability of the coated environmental humidity adjusting article needs to be improved, and the humidity adjusting performance may be invalid due to the falling of humidity adjusting components in the daily use process, so that the coated environmental humidity adjusting article cannot be effectively used for a long time; the silica-based humidity regulating article is not environment-friendly, is easy to generate a large amount of waste water and has a single humidity regulating function.
Therefore, the bidirectional humidity-adjusting bag for storing the articles is provided, the humidity can be effectively and quickly adjusted within a specific range according to the environment where the articles are located, the size of the bidirectional humidity-adjusting bag can be adjusted according to the article storage requirement, the actual use requirements of different articles are met, the humidity adjusting range is wide (30-95%), the cost is low, the use is convenient, the bidirectional humidity-adjusting bag can be effectively used for a long time, the storage of articles such as dried flowers, cigars, guitars and the like which have high requirements on the relative humidity of the storage environment is met, and the bidirectional humidity-adjusting bag has important research significance and high actual application value.
Disclosure of Invention
In order to solve the problems, the invention provides a bidirectional humidity control bag for storing articles, which consists of a moisture permeable packaging material and a humidity control agent, wherein the bidirectional humidity control bag is prepared by wrapping the humidity permeable packaging material with the humidity control agent.
As a preferable technical scheme, the humidity conditioning agent comprises 0.5-5% of hydrophilic high molecular compound, 8-50% of humidity conditioning component and 50-90% of water in percentage by weight.
As a preferred technical scheme, the water is selected from any one of tap water, purified water, distilled water, filtered water and deionized water; preferably, the water is deionized water;
in order to reduce the pressure of the moisture in the humidity control agent on the moisture permeable packaging material as much as possible, the applicant of the present invention has made a great deal of research experiments and found that when the mass ratio of the hydrophilic polymer compound to the humidity control component in the system is (1-4): (20-50), the humidity regulator is in a gel sticky state, the existence of the hydrophilic high molecular compound can effectively relieve the acting force of moisture on the moisture permeable packaging material, and the moisture permeable packaging material with a layered structure of a specific material is matched to prevent the moisture leakage from influencing the use effect. As a preferred technical scheme, the hydrophilic high molecular compound is selected from one or a combination of more of chitosan, carrageenan, gelatin, konjac gum, xanthan gum, methylcellulose, hydroxypropyl methylcellulose, guar gum and arabic gum; preferably, the hydrophilic polymer compound is a combination of gelatin, gum arabic, methylcellulose and guar gum; preferably, the mass ratio of the gelatin to the gum arabic to the methylcellulose to the guar gum is (1.5-2): (0.8-1.5): (1.2-1.8): (0.5-1); in the process of research, the applicant finds that when a combination of gelatin, arabic gum, methylcellulose and guar gum is adopted as the hydrophilic macromolecular compound, particularly when the mass ratio of the gelatin to the Arabic gum to the methylcellulose to the guar gum is (1.5-2): (0.8-1.5): (1.2-1.8): (0.5-1), the humidity control agent has good matching property with the humidity control component in the system, under the condition that the humidity control effect of the humidity control component is not influenced, the humidity control component is uniformly dispersed in a physical network structure formed by hydrophilic high molecular compounds, the effect of promoting the humidity control component to synergistically regulate the humidity is achieved, the system stability is improved, and the effective service life of the humidity control bag is prolonged.
The gelatin, gum arabic, methylcellulose, and guar gum were all purchased from sigma aldrich (shanghai) trade ltd.
As a preferable technical solution, the humidity controlling component is selected from a combination of at least three of sodium chloride, potassium chloride, lithium chloride, sodium lactate, potassium citrate, sodium bromide, sodium benzoate, potassium sulfate, sodium nitrate and lithium bromide; preferably, the humidity adjusting component comprises sodium salt, lithium salt and potassium salt; according to the humidity adjusting method, the humidity can be effectively and rapidly adjusted within a specific range according to the environment where the article is located through adjustment of the formula, the humidity adjusting range is as wide as 30% -95%, and the storage requirement of the article with high relative humidity requirement on the storage environment is met. As a preferable technical solution, the humidity control component is a combination of sodium chloride, sodium lactate, potassium chloride and lithium bromide, and the mass ratio of the sodium chloride, the sodium lactate, the potassium chloride and the lithium bromide is (6-10): (2-4): (3-7): (5-8); through a large number of experiments, the application discovers that when the humidity regulating component is the combination of sodium chloride, sodium lactate, potassium chloride and lithium bromide, especially when the mass ratio of the sodium chloride to the sodium lactate to the potassium chloride to the lithium bromide is (6-10): (2-4): (3-7): (5-8), the moisture permeable packing material which is matched with the hydrophilic high molecular compound and a specific material can effectively adjust and control the environmental humidity to be 65% -80%, the efficiency is high, additional post-treatment is not needed, the resource waste is avoided, and the method is particularly suitable for storing dried flowers, cigars and guitars.
As a preferred technical scheme, the preparation method of the humidity regulator comprises the following steps: controlling the temperature to be 30-40 ℃, adding the water and the humidity-adjusting components into a container according to the weight percentage, stirring for 3-5min, heating to 55-70 ℃, adding the hydrophilic macromolecular compound, and stirring for 15-25min to obtain the water-soluble film.
In order to facilitate application and popularization and meet the actual use requirement, the humidity control agent is coated by the moisture permeable packing material and then is actually applied; in order to meet the requirement of the regulator on regulating the environmental humidity, as a preferable technical scheme, the moisture permeable packing material is of a 2-5 layer laminated structure; preferably, the moisture permeable packing material is of a two-layer structure or a three-layer structure, and the two-layer structure or the three-layer structure is prepared by laminating, coating, compounding and hot pressing;
as a preferred technical scheme, the moisture permeable packing material is of a two-layer structure; preferably, the two-layer structure comprises an inner layer and an outer layer; preferably, the inner layer is a waterproof, moisture-permeable and breathable film layer, and the waterproof, moisture-permeable and breathable film layer is any one of a low-density polyethylene film, a linear low-density polyethylene film, a polyethylene breathable film and a TPU moisture-permeable film; the outer layer is any one of common paper, kraft paper, packing paper, double-sided offset paper, copper plate paper, white cardboard, glass paper, parchment paper and non-woven fabrics; preferably, the waterproof moisture-permeable breathable film layer is a TPU moisture-permeable film, and preferably, the TPU moisture-permeable film has a moisture permeability of 2500-8000g/m determined by adopting American standard ASTM E96BW2000 2 24h, preferably, the TPU moisture permeable membrane is selected from any one of XG2090-09, TH-105WE, TH-105FE, TM-103WSE and TM-103 FE; preferably, the TPU moisture permeable film is TM-103WSE. The outer layer is made of copper board paper. When the moisture permeability is highWhen the packing material is of a two-layer structure, the inner layer is designed to have the moisture permeability of 2500-8000g/m 2 The TPU moisture permeable membrane of 24h is as waterproof moisture permeable membrane layer, especially when the TPU moisture permeable membrane is TM-103WSE, the cooperation skin is coated paper, when guaranteeing that the humidity control agent can effectively adjust and control the ambient humidity to be 30% -95%, prevent the leakage of moisture, preparation simple process, the cost is lower, convenient to use can be according to article save needs to adjust the size of two-way humidifying package, satisfy the actual use demand of different article, be fit for extensive popularization production and use.
The TM-103WSE type TPU moisture permeable film is purchased from Jiaxing Nanxiong polymer Co., ltd;
as a preferred technical scheme, the moisture permeable packing material is of a three-layer structure; preferably, the three-layer structure comprises an inner layer, a middle layer and a non-woven fabric layer; preferably, the inner layer is selected from any one of a polyethylene breathable film, a high moisture permeable TPU film and a medium moisture permeable TPU film; the middle layer is any one of a TPU film with low moisture permeability, double-sided offset paper, copper board paper, white cardboard and glass paper; the non-woven fabric layer is any one of PP non-woven fabric, PET non-woven fabric and laminating non-woven fabric; preferably, the inner layer is a polyethylene breathable film, the middle layer is a white cardboard, and the non-woven fabric layer is a laminating non-woven fabric. When the moisture permeable packing material is of a three-layer structure, the inner layer is a polyethylene breathable film, the middle layer is white cardboard, the non-woven fabric layer is a laminating non-woven fabric, moisture transfer is carried out between the humidity control agent and the external environment so as to adjust and control the environmental humidity to be 30% -95%, the use safety is improved, the preparation process is simple, the cost is low, the use is convenient, the size of the bidirectional humidity control package can be adjusted according to the storage requirement of the article, the actual use requirements of different articles are met, and the moisture permeable packing material is suitable for large-scale popularization, production and use.
The polyethylene breathable films were purchased from Xinle Huabao Plastic films, inc.; the laminating non-woven fabric is purchased from Hengda cloth industry Co., ltd.
The invention also provides application of the bidirectional humidity-adjusting bag for storing the articles, which is suitable for storing dried flowers, cigars and guitar articles with higher requirements on the relative humidity of the storage environment.
Has the beneficial effects that:
1. the efficient and stable bidirectional humidity adjusting bag for storing the articles is prepared by wrapping a regulator with a moisture-permeable packaging material, is simple in preparation process, low in cost, convenient to use, high in safety, and capable of adjusting and controlling the environmental humidity to be 30% -95%, adjusting the size of the bidirectional humidity adjusting bag according to the article storage requirement, meeting the actual use requirements of different articles, and being suitable for large-scale popularization, production and use.
2. The combination of gelatin, arabic gum, methylcellulose and guar gum is adopted as the hydrophilic macromolecular compound, and particularly, when the mass ratio of the gelatin to the Arabic gum to the methylcellulose to the guar gum is (1.5-2): (0.8-1.5): (1.2-1.8): (0.5-1), the humidity control composition has good matching property with the humidity control composition in the system, under the condition that the humidity control effect of the humidity control composition is not influenced, the humidity control composition is uniformly dispersed in a physical network structure formed by the hydrophilic high molecular compound, the effect of promoting the humidity control by the cooperation of the humidity control composition is realized, the system stability is improved, and the effective service life of the humidity control bag is prolonged.
3. According to the humidity adjusting method and device, the humidity can be effectively and rapidly adjusted within a specific range according to the environment where the article is located through adjustment of the formula, the humidity adjusting range is as wide as 30% -95%, and the storage requirement of the article with high relative humidity requirement on the storage environment is met.
4. When the humidity regulating component is the combination of sodium chloride, sodium lactate, potassium chloride and lithium bromide, particularly when the mass ratio of the sodium chloride to the sodium lactate to the potassium chloride to the lithium bromide is (6-10): (2-4): (3-7): (5-8), the moisture permeable packing material matched with the hydrophilic high molecular compound and the specific material can effectively adjust and control the environmental humidity to 65% -80%, has high efficiency, does not need additional post-treatment, avoids resource waste, and is particularly suitable for storing dried flowers, cigars and guitars.
Detailed Description
Example 1
In one aspect, embodiment 1 of the present invention provides a bidirectional humidity control bag for article storage, which is composed of a moisture permeable packaging material and a humidity control agent, and the bidirectional humidity control bag is prepared by wrapping the humidity permeable packaging material with the humidity control agent.
The humidity conditioning agent comprises 3% of hydrophilic high molecular compound, 35% of humidity conditioning component and 62% of water in percentage by weight.
The water is deionized water;
the mass ratio of the hydrophilic polymer compound to the humidity-controlling component is 3:35;
the hydrophilic high molecular compound is the combination of gelatin, arabic gum, methylcellulose and guar gum; the mass ratio of the gelatin to the gum arabic to the methylcellulose to the guar gum is 1.8:1.2:1.5:0.8.
the gelatin, gum arabic, methylcellulose, and guar gum were all purchased from sigma aldrich (shanghai) trade ltd.
The humidity-controlling component is a combination of sodium chloride, sodium lactate, potassium chloride and lithium bromide, and the mass ratio of the sodium chloride to the sodium lactate to the potassium chloride to the lithium bromide is 8:3:5:6.
the preparation method of the humidity regulator comprises the following steps: controlling the temperature to be 35 ℃, adding water and the humidity adjusting components into a container according to the weight percentage, stirring for 5min, heating to 60 ℃, adding the hydrophilic macromolecular compound, and stirring for 20min to obtain the water-based humidity adjusting agent.
The moisture permeable packing material is of a two-layer structure, and the two-layer structure is prepared by film spraying, coating, compounding and hot pressing;
the two-layer structure comprises an inner layer and an outer layer; the inner layer is a waterproof moisture-permeable breathable film layer, the waterproof moisture-permeable breathable film layer is a TPU moisture-permeable film, and the TPU moisture-permeable film is TM-103WSE. The outer layer is made of copper plate paper; the TM-103WSE type TPU moisture permeable membrane is purchased from Jiaxing Nanxiong polymer Co.
Example 2
In embodiment 2 of the present invention, on the one hand, there is provided a bidirectional humidity control bag for storing articles, which is composed of a moisture permeable packaging material and a humidity control agent, and the bidirectional humidity control bag is prepared by wrapping the humidity permeable packaging material with the humidity control agent.
The humidity conditioning agent comprises 3% of hydrophilic high molecular compound, 35% of humidity conditioning component and 62% of water in percentage by weight.
The water is deionized water;
the mass ratio of the hydrophilic polymer compound to the humidity-controlling component is 3:35;
the hydrophilic polymer compound is a combination of gelatin, arabic gum, methylcellulose and guar gum; the mass ratio of the gelatin to the gum arabic to the methylcellulose to the guar gum is 1.8:1.2:1.5:0.8.
the gelatin, gum arabic, methylcellulose, and guar gum were all purchased from sigma aldrich (shanghai) trade ltd.
The humidity-controlling component is a combination of sodium chloride, sodium lactate, potassium chloride and lithium bromide, and the mass ratio of the sodium chloride to the sodium lactate to the potassium chloride to the lithium bromide is 8:3:5:6. the preparation method of the humidity regulator comprises the following steps: controlling the temperature to be 35 ℃, adding water and the humidity-adjusting components according to the weight percentage into a container, stirring for 5min, heating to 60 ℃, adding the hydrophilic macromolecular compound, and stirring for 20min to obtain the water-soluble polymer.
The moisture permeable packing material is of a three-layer structure, and the three-layer structure is prepared by film spraying, coating, compounding and hot pressing; the three-layer structure comprises an inner layer, a middle layer and a non-woven fabric layer; the inner layer is a polyethylene breathable film, the middle layer is white cardboard, and the non-woven fabric layer is a laminating non-woven fabric. The polyethylene breathable film is purchased from Xinle Huabao plastic film Co., ltd; the laminating non-woven fabric is purchased from Hendabu limited of Dongguan.
Example 3
In one aspect, embodiment 3 of the present invention provides a bidirectional humidity control bag for article storage, which is composed of a moisture permeable packaging material and a humidity control agent, and the bidirectional humidity control bag is prepared by wrapping a conditioning agent with the moisture permeable packaging material.
The humidity conditioning agent comprises 3% of hydrophilic high molecular compound, 30% of humidity conditioning component and 67% of water by weight percentage.
The water is deionized water;
the mass ratio of the hydrophilic polymer compound to the humidity-controlling component is 3:30, of a nitrogen-containing gas;
the hydrophilic polymer compound is a combination of gelatin, arabic gum, methylcellulose and guar gum; the mass ratio of the gelatin to the gum arabic to the methylcellulose to the guar gum is 2:1.5:1.8:1.
the gelatin, gum arabic, methylcellulose, and guar gum were all purchased from sigma aldrich (shanghai) trade ltd.
The humidity-controlling component is a combination of sodium chloride, sodium lactate, potassium chloride and lithium bromide, and the mass ratio of the sodium chloride to the sodium lactate to the potassium chloride to the lithium bromide is 6:4:5:5.
the preparation method of the humidity regulator comprises the following steps: controlling the temperature to be 35 ℃, adding water and the humidity adjusting components into a container according to the weight percentage, stirring for 5min, heating to 60 ℃, adding the hydrophilic macromolecular compound, and stirring for 20min to obtain the water-based humidity adjusting agent.
The moisture permeable packing material is of a two-layer structure, and the two-layer structure is prepared by film spraying, coating, compounding and hot pressing;
the two-layer structure comprises an inner layer and an outer layer; the inner layer is a waterproof moisture-permeable breathable film layer, the waterproof moisture-permeable breathable film layer is a TPU moisture-permeable film, and the TPU moisture-permeable film is TM-103WSE. The outer layer is made of copper board paper; the TM-103WSE type TPU moisture permeable membrane is purchased from Jiaxing Nanxiong polymer Co.
Comparative example 1
Comparative example 1 of the present invention provides a bidirectional humidity control pack for storage of articles, which is similar to example 1 in specific embodiment, except that the mass ratio of the hydrophilic polymer compound to the humidity control component is 0.5:50.
comparative example 2
Comparative example 2 of the present invention is a two-way humidity control pack for storage of goods, and the specific embodiment thereof is the same as example 2, except that the hydrophilic polymer compound does not contain methylcellulose.
Comparative example 3
The invention provides a comparative example 3 which provides a bidirectional humidity-controlling bag for article preservation, and the specific implementation manner is the same as that in example 1, except that the waterproof and moisture-permeable breathable film layer is a TPU film with low moisture permeability.
Performance test method
1. Bidirectional humidity regulation performance: (1) The two-way conditioning packs (8 g) prepared in examples and comparative examples were placed in a cigar box containing 3 cigars and having a humidity of 65%, and the time t required for the humidity in the cigar box to be adjusted to a standard humidity of 75% was recorded 1 The results are shown in Table 1.
(2) The two-way humidity control packs (8 g) prepared in examples and comparative examples were placed in a cigar box containing 3 cigars and having a humidity of 80%, and the time t required for the humidity in the cigar box to be adjusted to a standard humidity of 75% was recorded 2 The results are shown in Table 1.
2. Long-acting humidity regulation performance: the two-way conditioning packs (120 g) prepared in examples and comparative examples were placed in cigar boxes containing 50 cigars and having a humidity of 65 to 85%, and the time t required for the humidity in the cigar boxes to be adjusted to a standard humidity of 75% was recorded 3 (ii) a The humidity of the cigar boxes after 4 months storage was measured using a hygrometer and the results are shown in table 1.
Table 1 results of performance test of the bidirectional humidity conditioning packs prepared in examples 1 to 3 and comparative examples 1 to 3.
Claims (10)
1. A bidirectional humidity-regulating bag for storing articles is characterized by comprising a moisture-permeable bag material and a humidity regulator.
2. The bidirectional humidity control package for storing goods according to claim 1, wherein the humidity control agent comprises 0.5 to 5% by weight of a hydrophilic polymer compound, 8 to 50% by weight of a humidity control component, and 50 to 90% by weight of water.
3. The bidirectional humidity control pack for storing goods according to claim 2, wherein the mass ratio of the hydrophilic polymer compound to the humidity control component is (1-4): (20-50).
4. The bi-directional moisture control pack for preserving goods according to claim 2 or 3, wherein the moisture control component is selected from the group consisting of sodium chloride, potassium chloride, lithium chloride, sodium lactate, potassium citrate, sodium bromide, sodium benzoate, potassium sulfate, sodium nitrate, and lithium bromide.
5. The bidirectional humidity control pack for storage of articles according to any one of claims 2 to 4, wherein the humidity control component comprises a sodium salt, a lithium salt, or a potassium salt.
6. The bidirectional humidity control pack according to claim 2 or 3, wherein the hydrophilic polymer compound is one or more selected from chitosan, carrageenan, gelatin, konjac gum, xanthan gum, methylcellulose, hydroxypropyl methylcellulose, guar gum, and gum arabic.
7. The bidirectional humidity control pack for storing goods according to claim 2, wherein the humidity control agent is prepared by a method comprising: controlling the temperature at 30-40 deg.C, adding water and humidity regulating components into a container according to weight percentage, stirring for 3-5min, heating to 55-70 deg.C, adding hydrophilic macromolecular compound, and stirring for 15-25min to obtain the final product.
8. The bidirectional humidity control bag for storing articles as claimed in claim 1, wherein the moisture permeable bag material has a 2-5 layer laminate structure.
9. The two-way humidity control bag for storing goods as claimed in claim 1, wherein the moisture permeable packaging material has a two-layer structure or a three-layer structure, and the two-layer structure or the three-layer structure is prepared by laminating, coating, compounding and hot pressing.
10. Use of a bi-directional moisture-control pack according to any one of claims 1 to 9 for the storage of articles, such as dried flowers, cigars and guitars.
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| CN202111648406.7A CN115339772A (en) | 2021-12-30 | 2021-12-30 | Bidirectional humidity-regulating bag for storing articles and application thereof |
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| CN111332595A (en) * | 2020-03-16 | 2020-06-26 | 湘潭宏达防潮保鲜技术开发有限公司 | Processing and manufacturing method of bidirectional humidity control bag for cigar preservation |
| CN215152667U (en) * | 2021-01-20 | 2021-12-14 | 嘉兴星越包装材料有限公司 | High-moisture-permeability cover film for dehumidification box and dehumidification box with same |
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2021
- 2021-12-30 CN CN202111648406.7A patent/CN115339772A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5936178A (en) * | 1997-06-10 | 1999-08-10 | Humidi-Pak, Inc. | Humidity control device |
| CN201010188Y (en) * | 2007-03-15 | 2008-01-23 | 沈跃华 | Ventilating anti-leaking back package material construction |
| CN105246579A (en) * | 2013-03-14 | 2016-01-13 | 波凡达股份有限公司 | Humidity control system for wood products |
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