CN109612990B - Method for arbitrarily setting designated failure point of drying agent bag and product - Google Patents
Method for arbitrarily setting designated failure point of drying agent bag and product Download PDFInfo
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Abstract
The invention relates to a method and a product for arbitrarily setting a designated failure point of a desiccant bag, wherein the desiccant bag comprises a desiccant main bag and a humidity indicator auxiliary bag; the desiccant main bag comprises a desiccant and a first breathable packaging bag wrapping the desiccant; the humidity indicator auxiliary bag comprises a humidity indicator and a second transparent breathable packaging bag for wrapping the humidity indicator; the desiccant primary pack and the humidity indicator secondary pack are arranged by the following steps: 1) setting a designated failure point of a main desiccant bag, and setting the moisture permeation rate of the main desiccant bag to obtain the designated failure time of the corresponding main desiccant bag; 2) the moisture permeation rate of the humidity indicator secondary bag and the color change point of the humidity indicator are adjusted, so that the color change time of the humidity indicator in the humidity indicator secondary bag is smaller than or equal to the specified failure time of the desiccant primary bag. The method and the product enable the humidity indicator to timely and accurately indicate that the drying agent reaches the specified failure point, and can judge whether the drying agent fails or not only through visual observation.
Description
Technical Field
The invention relates to the field of drying agents, in particular to a method and a product for arbitrarily setting a designated failure point of a drying agent bag.
Background
Desiccants refer to substances that remove moisture from moist substances and are often classified into two categories: chemisorption driers, such as calcium oxide, and the like, which dry by combining with water to form hydrates; physical adsorption drying agents, such as silica gel, molecular sieves, activated alumina, and the like, physically adsorb water through the pores for drying.
No matter the chemical adsorption drying agent or the physical adsorption drying agent, the chemical adsorption drying agent or the physical adsorption drying agent only has moisture absorption capacity, does not have a humidity indicating function, and cannot judge the moisture absorption state of the drying agent only through appearance. Therefore, it is desirable to incorporate a humidity indicator into the desiccant.
Humidity indicators generally include color changing silica gels (cobalt-containing blue silica gels and cobalt-free orange silica gels) and indicator cards.
(1) Blue silica gel: the main component of the discolored part is cobalt chloride, which shows different colors by the change of the amount of crystal water of the cobalt chloride, namely, the blue color before moisture absorption is gradually changed into light red along with the increase of moisture absorption. The amount of crystal water varies with the environment, and when the silica gel absorbs water to a certain extent in the moisture absorption process, CoCl2CoCl is formed2·6H2O, this material is pink. When the silica gel desiccant is deactivated, it exhibits a pink color and can be regenerated by heating.
(2) Orange silica gel: the main component of the color-changing part is an acid-base indicator which is an organic acid or base with a complex structureThe molecular structure is c (H)+)、c(OH-) The internal rearrangement in different solutions can occur, i.e. different types are generated, the structures of various types are different, and the absorption selectivity to light is different, so that different colors are presented.
(3) An indication card: titrating the cobalt chloride or the acid-base indicator on a paper card through a prepared solution, and drying to obtain a product which is substantially a derivative product of a blue gel or orange gel indicator.
The existing desiccant bag containing the humidity indicator is usually formed by mixing the humidity indicator and the desiccant in a bag material, and the moisture absorption degree of the desiccant is judged by changing the color of the humidity indicator.
For physisorption desiccants, the humidity indicator may, within certain limits, generally determine the degree of moisture absorption of the desiccant and the relative humidity of the environment in which it is located. However, when the desiccant is applied to a specific security industry, before the desiccant is assembled into security camera equipment, the desiccant is exposed on an assembly line for a period of time, so that the moisture absorption performance of the desiccant is lost, and the moisture absorption performance of the desiccant is directly related to the problem of fogging of a lens of the camera equipment, so that the requirement on the lost part of the desiccant is high, for example, less than 3.0% or lower, and at the moment, the indicator cannot indicate a desiccant failure point (loss point), namely, the desiccant failure point cannot be visually judged through observation. The main reason is that the orange glue indicator in the molecular sieve and orange glue mixing drying agent for the market security industry needs to reach about 17% to start to change color, resulting in the following phenomena: when the desiccant has exceeded the point of failure and the wetness indicator has not yet reached the point of color change, it is not possible to indicate the moisture absorption state of the desiccant.
For chemical adsorption drying agent, such as calcium oxide or modified calcium oxide drying agent recently used in security industry for improving moisture absorption capacity, the moisture absorption process is mainly that water molecules and calcium oxide are combined to form very stable calcium hydroxide, H2O+CaO＝Ca(OH)2Therefore, in the process of absorbing moisture, the water molecules are less and less, and the environmental humidity in the packing material bag is reduced continuously. The following phenomena can occur: the moisture absorption of the chemisorption desiccant is increasing due to the bagThe humidity of the environment in the bag will decrease with the moisture absorption of the chemisorptive desiccant, so that the humidity indicator will have a lower and lower trend of developing humidity, and the two trends will be opposite. Therefore, the humidity indicator and the chemical desiccant can not realize the function of indicating the moisture absorption state of the desiccant when being mixed.
Disclosure of Invention
The invention aims to provide a method and a product for arbitrarily setting a designated failure point of a desiccant bag aiming at the defects of the prior art, so that a humidity indicator can timely and accurately indicate whether the desiccant reaches the designated failure point.
The technical scheme provided by the invention is as follows:
a method of arbitrarily setting a designated point of failure for a desiccant packet, the desiccant packet comprising a primary desiccant packet and a secondary wetness indicator packet; the desiccant main bag comprises a desiccant and a first breathable packaging bag wrapping the desiccant; the humidity indicator auxiliary bag comprises a humidity indicator and a second transparent breathable packaging bag for wrapping the humidity indicator;
the desiccant primary bag and the humidity indicator secondary bag are arranged through the following steps:
1) setting a designated failure point of a main desiccant bag, and setting the moisture permeation rate of the main desiccant bag to obtain the designated failure time of the corresponding main desiccant bag;
2) the moisture permeation rate of the humidity indicator secondary bag and the color change point of the humidity indicator are adjusted, so that the color change time of the humidity indicator in the humidity indicator secondary bag is smaller than or equal to the specified failure time of the desiccant primary bag.
According to the invention, the drying agent and the humidity indicator are packaged separately, so that when the drying agent in the main bag and the humidity indicator in the auxiliary bag are influenced by the environment, the drying agent and the humidity indicator are independent and not influenced mutually. Firstly, by adjusting the moisture permeation rates of the moisture permeation rate and the humidity indicator, the color change time of the humidity indicator in the humidity indicator secondary bag is ensured to be less than or equal to the specified failure time of the desiccant primary bag, and the purpose of timely and accurate indication is achieved. Secondly, can judge whether the drier primary package has reached appointed failure point through direct observation humidity indicator secondary package.
The specified time to failure in the present invention is equal to the specified point of failure divided by the moisture permeation rate of the desiccant primary package. The moisture permeation rate of the desiccant primary packet refers to the mass of moisture and the percentage of desiccant mass that permeates the first breathable packaging bag per unit time. The moisture vapor transmission rate of the desiccant primary packet is determined by the material of the first air-permeable package and the weight of the desiccant, and the moisture transmission rate of the desiccant primary packet can be obtained by selecting the material and the weight of the desiccant of the corresponding first air-permeable package.
The color change time of the humidity indicator is equal to the color change point of the humidity indicator divided by the moisture permeation rate of the humidity indicator secondary bag. The moisture permeability rate of the secondary humidity indicator package is the percentage of the mass of water and the mass of the indicator that pass through the second transparent breathable packaging bag per unit time. The moisture permeability rate of the secondary humidity indicator bag is determined by the material of the second transparent breathable packaging bag and the weight of the humidity indicator, and the moisture permeability rate of the corresponding secondary humidity indicator bag can be obtained by selecting the material of the corresponding second transparent breathable packaging bag and the weight of the humidity indicator.
The main desiccant bag and the auxiliary humidity indicator bag can be of a split structure, a continuous bag structure or a joint structure of the two. Preferably, the desiccant primary bag and the humidity indicator secondary bag are in a connected bag structure or a joint structure of the desiccant primary bag and the humidity indicator secondary bag. The bag connecting structure means that at least one side edge or at least one end of the two are connected, and the attaching structure means that the two are adhered or bound together.
The desiccant in the invention can be physical adsorption desiccant, chemical adsorption desiccant or a mixture of the physical adsorption desiccant and the chemical adsorption desiccant. The physical adsorption drying agent can be silica gel, molecular sieve, alumina drying agent, etc. The chemical adsorption drying agent can be calcium oxide, modified calcium oxide and the like. Preferably, the desiccant is a chemical adsorption desiccant or a mixture of a physical adsorption desiccant and a chemical adsorption desiccant.
The designated failure point in the invention refers to an artificially set failure point, and the value thereof is not more than the saturation failure point of the desiccant, and the value can be arbitrarily designated within the range. The designated failure point is the minimum requirement of the equipment using the desiccant for the loss point (loss value) at which the desiccant is used. The specified failure point is specifically the ratio of the mass of moisture adsorbed by the desiccant to the mass of the desiccant itself. Preferably, the designated failure point is 0.01% to 50.0%. More preferably: 0.1-30.0%, 0.1-15.0% and 0.1-5.0%.
The first breathable packaging bag is made of a composite material of non-woven fabric and a heat-sealable breathable film, or a composite material of paper and the heat-sealable breathable film. Wherein, the ventilated membrane contains a moisture permeable functional structure.
The first breathable packaging bag is made of a composite material of non-woven fabric or paper and a heat-sealable plastic film, or two or more layers of heat-sealable composite plastic films; the plastic film is provided with a pore channel.
The second transparent breathable packaging bag is made of two layers or more than two layers of transparent composite plastic films; the transparent composite plastic film is provided with a pore channel. Preferably, PET/CPP, PET/PE, PET/OPP/CPP, PET/OPP/PE, etc.
The pore channel in the invention can be a processed pore channel, such as a pinhole treatment or a hot hole treatment. Preferably, the pore passage is a pinhole or a hot hole.
The color change point of the humidity indicator is selected as the mutation point of the color change. The abrupt change point of the color change refers to the ratio of the mass of the moisture adsorbed by the humidity indicator to the mass of the humidity indicator when the color of the humidity indicator is abruptly changed.
The invention also provides a desiccant bag capable of arbitrarily setting the designated failure point, which comprises a desiccant main bag and a humidity indicator auxiliary bag; the desiccant main bag comprises a desiccant and a first breathable packaging bag wrapping the desiccant; the humidity indicator auxiliary bag comprises a humidity indicator and a second transparent breathable packaging bag for wrapping the humidity indicator;
the desiccant primary bag and the humidity indicator secondary bag are arranged through the following steps:
1) setting a designated failure point of a main desiccant bag, and setting the moisture permeation rate of the main desiccant bag to obtain the designated failure time of the corresponding main desiccant bag;
2) the moisture permeation rate of the humidity indicator secondary package and the color mutation point of the humidity indicator are adjusted, so that the color mutation time of the humidity indicator in the humidity indicator secondary package is smaller than or equal to the specified failure time of the desiccant primary package.
Compared with the prior art, the invention has the beneficial effects that:
by adopting the design scheme of the invention, no matter the drying agent is a physical adsorption drying agent, a chemical adsorption drying agent or a mixed drying agent of the physical adsorption drying agent and the chemical adsorption drying agent, no matter what the value of the specified failure point is, the humidity indicator can timely and accurately indicate that the drying agent reaches the specified failure point, and the failure state of the drying agent can be visually judged only by observing the color change point of the indicator.
Drawings
FIG. 1 is a schematic structural view of a one-piece desiccant packet according to example 1;
FIG. 2 is a schematic view of the construction of a divided desiccant package according to embodiment 6;
fig. 3 is a schematic view of the structure of the mixed desiccant package in comparative example 1.
Detailed Description
The invention is described in further detail below with reference to specific embodiments and the attached drawings.
Example 1
As shown in fig. 1, the conjoined desiccant bag 1 includes a desiccant primary bag 11 and a humidity indicator secondary bag 12, which are connected together. The desiccant main bag 11 is internally provided with a desiccant 13, and the humidity indicator auxiliary bag 12 is provided with a humidity indicator 14.
The desiccant 13 is a 4A molecular sieve desiccant with a mass of 5.0 grams. The humidity indicator 14 is orange silica gel with a mass of 0.3 g and a color change point of 17%.
The desiccant primary packet 11 and the humidity indicator secondary packet 12 are made of the same material, and the material is PET/CPP. The desiccant main bag 11 is provided with pore channels, and the moisture permeation rate of the desiccant main bag 11 is 2.5%/day at 25 ℃ and 90% RH by adjusting the size and the number of the pore channels. The designated failure point of the main desiccant bag 11 is set to be 5% manually, and the designated failure time of the main desiccant bag 11 is calculated to be 2 days.
The humidity indicator secondary package 12 is also provided with pore channels, and by adjusting the size and the number of the pore channels, the moisture permeability rate of the humidity indicator secondary package 12 is 8.5%/day, 25 ℃ and 90% RH, so that the color change time of the humidity indicator 14 in the humidity indicator secondary package 12 is 2 days and is equal to the specified failure time of the desiccant primary package 11.
In actual test, the conjoined desiccant bag 1 is placed in an environment with 25 ℃ and 90% RH, when the color change time is reached, the humidity indicator 14 generates color mutation, the moisture content of the desiccant 13 is measured to be 4.93%, and the moisture content is close to the specified failure point to be 5%, so that the humidity indicator 14 can timely and accurately indicate that the desiccant 13 reaches the specified failure point.
Example 2
The construction of the integrated desiccant packet 1 was the same as in example 1.
The drying agent 13 is an alumina drying agent, and the mass is 3.0 g. The humidity indicator 14 is blue silica gel with a mass of 0.5 g and a color change point of 26%.
The desiccant primary packet 11 is made of the same material as the wetness indicator secondary packet 12, and the material is OPP/PE. The desiccant main bag 11 is provided with pore channels, and the moisture permeability rate of the desiccant main bag 11 is 5.0%/day, 15 ℃ and 90% RH by adjusting the size and the number of the pore channels. The designated failure point of the main desiccant bag 11 is set to 40% manually, and the designated failure time of the main desiccant bag 11 is calculated to be 8 days.
The humidity indicator secondary package 12 is also provided with pore channels, and by adjusting the size and the number of the pore channels, the moisture permeability rate of the humidity indicator secondary package 12 is 3.25%/day, 15 ℃ and 90% RH, so that the color change time of the humidity indicator 14 in the humidity indicator secondary package 12 is 8 days and is equal to the specified failure time of the desiccant primary package 11.
In actual test, the conjoined desiccant bag 1 is placed in an environment with 15 ℃ and 90% RH, when the color change time is reached, the color of the humidity indicator 14 is suddenly changed, the moisture content of the test desiccant 13 is 40.7%, and the moisture content is close to the specified failure point of 40%, which shows that the humidity indicator 14 can timely and accurately indicate that the desiccant 13 reaches the specified failure point.
Example 3
The construction of the integrated desiccant packet 1 was the same as in example 1.
The drying agent 13 is a common white silica gel drying agent with the mass of 10 g. The humidity indicator 14 is orange silica gel with a mass of 1.0 g and a color change point of 17%.
The desiccant primary packet 11 and the humidity indicator secondary packet 12 are made of the same material, and the material is PET/CPP. The desiccant main bag 11 is provided with pore channels, and the moisture permeability rate of the desiccant main bag 11 is 6.0%/day at 25 ℃ and 90% RH by adjusting the size and the number of the pore channels. The designated failure point of the main desiccant bag 11 is set to 30% by people, and the designated failure time of the main desiccant bag 11 is calculated to be 5 days.
The humidity indicator secondary package 12 is also provided with pore channels, and by adjusting the size and the number of the pore channels, the moisture permeability rate of the humidity indicator secondary package 12 is 3.4%/day, 25 ℃ and 90% RH, so that the color change time of the humidity indicator 14 in the humidity indicator secondary package 12 is 5 days and is equal to the specified failure time of the desiccant primary package 11.
In actual test, the conjoined desiccant bag 1 is placed in an environment with 25 ℃ and 90% RH, when the color change time is reached, the color of the humidity indicator 14 is suddenly changed, the moisture content of the test desiccant 13 is 30.6%, and the moisture content is close to the specified failure point of 30%, which shows that the humidity indicator 14 can timely and accurately indicate that the desiccant 13 reaches the specified failure point.
Example 4
The construction of the integrated desiccant packet 1 was the same as in example 1.
The drying agent 13 is a calcium oxide drying agent with a mass of 15 g. The humidity indicator 14 is orange silica gel with a mass of 1.0 g and a color change point of 17%.
The desiccant primary pack 11 is made of the same material as the humidity indicator secondary pack 12, and is made of PET/OPP/PE. The desiccant main bag 11 is provided with pore channels, and the moisture permeability rate of the desiccant main bag 11 is 0.6%/day at 20 ℃ and 70% RH by adjusting the size and the number of the pore channels. The designated failure point of the main desiccant bag 11 is set to 9.0% manually, and the designated failure time of the main desiccant bag 11 is calculated to be 15 days.
The humidity indicator secondary package 12 is also provided with pore channels, and by adjusting the size and the number of the pore channels, the moisture permeability rate of the humidity indicator secondary package 12 is 1.13%/day, 20 ℃ and 70% RH, so that the color change time of the humidity indicator 14 in the humidity indicator secondary package 12 is 15 days and is equal to the specified failure time of the desiccant primary package 11.
In actual test, the conjoined desiccant bag 1 is placed in an environment with 20 ℃ and 70% RH, when the color change time is reached, the color of the humidity indicator 14 is suddenly changed, the moisture of the test desiccant 13 is increased to 8.26% and is close to the specified failure point of 8.0%, and the humidity indicator 14 can timely and accurately indicate that the desiccant 13 reaches the specified failure point.
Example 5
The construction of the integrated desiccant packet 1 was the same as in example 1.
The drying agent 13 is a modified calcium oxide drying agent with a mass of 30 g. The humidity indicator 14 is orange silica gel with a mass of 1.5 g and a color change point of 12%.
The desiccant primary packet 11 is made of non-woven fabric/PE. The desiccant main bag 11 is provided with pore channels, and the moisture permeability rate of the desiccant main bag 11 is 3.0%/day at 25 ℃ and 90% RH by adjusting the size and the number of the pore channels. The designated failure point of the main desiccant bag 11 is set to 1.5% manually, and the designated failure time of the main desiccant bag 11 is calculated to be 0.5 day.
The material of the wetness indicator sub-package 12 is OPP/CPP. The humidity indicator secondary package 12 is also provided with pore channels, and the moisture permeability rate of the humidity indicator secondary package 12 is 24%/day, 25 ℃ and 90% RH by adjusting the size and the number of the pore channels, so that the color change time of the humidity indicator 14 in the humidity indicator secondary package 12 is 0.5 day, which is equal to the designated failure time of the desiccant primary package 11.
In actual test, the conjoined desiccant bag 1 is placed in an environment with 25 ℃ and 90% RH, when the color change time is reached, the color of the humidity indicator 14 is suddenly changed, the moisture of the test desiccant 13 is increased to 1.43% and is close to the specified failure point of 1.5%, and the humidity indicator 14 can timely and accurately indicate that the desiccant 13 reaches the specified failure point.
Example 6
As shown in fig. 2, the desiccant cartridge 2 includes a desiccant primary cartridge 21 and a humidity indicator secondary cartridge 22, which are separate bodies. The desiccant main bag 21 is filled with a desiccant 23, and the humidity indicator auxiliary bag 22 is filled with a humidity indicator 24.
The drying agent 23 is a 13X molecular sieve drying agent with a mass of 3.5 g. The humidity indicator 24 is orange silica gel with a mass of 0.2 g and a color change point of 12%.
The desiccant primary pack 21 and the humidity indicator secondary pack 22 are made of the same material, and the material is OPP/CPP. The desiccant main bag 21 is provided with pore channels, and the moisture permeation rate of the desiccant main bag 21 is 0.5%/day at 25 ℃ and 60% RH by adjusting the size and the number of the pore channels. The designated failure point of the desiccant main pack 21 was set to 5% by human, and the designated failure time of the desiccant main pack 21 was calculated to be 10 days.
The humidity indicator secondary package 22 is also provided with pore channels, and by adjusting the size and the number of the pore channels, the moisture permeability rate of the humidity indicator secondary package 22 is 1.2%, the temperature is 25 ℃, and the RH is 60%, so that the color change time of the humidity indicator 24 in the humidity indicator secondary package 22 is 10 days and is equal to the designated failure time of the desiccant primary package 21.
In actual test, the split drying agent 2 is placed in an environment with 25 ℃ and 60% RH, when the color change time is reached, the humidity indicator 24 has color mutation, the moisture content of the test drying agent 23 is 5.13%, and the moisture content is close to the specified failure point of 5%, which shows that the humidity indicator 24 can timely and accurately indicate that the drying agent 23 reaches the specified failure point.
Comparative example 1
As shown in fig. 3, the mixed desiccant package 3 includes a package 31 and a desiccant 32 and a humidity indicator 33 mixed in the package 31.
The material of the packaging bag 31 is OPP/CPP. The desiccant 32 was a modified calcium oxide desiccant with a mass of 10.0 grams and a saturation failure point of 52.0%. The humidity indicator 33 is orange silica gel with a mass of 0.5 g and a color change point of 12.0%. The specified failure point for the desiccant 32 was set to 12.0%.
In actual test, the humidity indicator 33 changes color when the mixed desiccant package 3 is placed in an environment with 25 ℃ and 80% RH, and the moisture of the test desiccant 32 increases by 20.6% and is far beyond the specified failure point by 12.0%, which indicates that the desiccant 32 cannot be timely and accurately indicated to reach the specified failure point.
Claims (9)
1. A method of arbitrarily setting a designated point of failure for a desiccant package, wherein the desiccant package comprises a primary desiccant package and a secondary humidity indicator package; the desiccant main bag comprises a desiccant and a first breathable packaging bag wrapping the desiccant; the humidity indicator auxiliary bag comprises a humidity indicator and a second transparent breathable packaging bag for wrapping the humidity indicator;
the desiccant primary bag and the humidity indicator secondary bag are arranged through the following steps:
1) setting a designated failure point of a main desiccant bag, and setting the moisture permeation rate of the main desiccant bag to obtain the designated failure time of the corresponding main desiccant bag;
2) the moisture permeability rate of the humidity indicator secondary bag and the color change point of the humidity indicator are adjusted, so that the color change time of the humidity indicator in the humidity indicator secondary bag is less than or equal to the specified failure time of the desiccant primary bag;
the color change point of the wetness indicator is selected to be a discontinuity in its color change.
2. The method of claim 1, wherein the primary desiccant packet and the secondary humidity indicator packet are in a packet structure or a laminate structure.
3. The method of any given point of failure of a desiccant package as claimed in claim 1 wherein the desiccant is a chemisorbed desiccant or a mixture of a physisorbed desiccant and a chemisorbed desiccant.
4. The method of any given point of failure of a desiccant package of claim 1 wherein the point of failure is from 0.01% to 50.0%.
5. The method of claim 1, wherein the first air-permeable packaging bag is made of a composite of a nonwoven fabric and a heat-sealable air-permeable film, or a composite of paper and a heat-sealable air-permeable film.
6. The method for arbitrarily setting a designated failure point of a desiccant package as claimed in claim 1, wherein the material of the first air-permeable packing bag is a composite of nonwoven fabric or paper and a heat-sealable plastic film, or two or more layers of heat-sealable composite plastic films; the plastic film is provided with a pore channel.
7. The method of claim 1, wherein the second transparent breathable packaging bag is made of two or more layers of transparent composite plastic films; the transparent composite plastic film is provided with a pore channel.
8. The method of any one of claims 6 or 7, wherein the aperture is a pinhole or a hot hole.
9. A desiccant bag capable of arbitrarily setting a designated failure point is characterized by comprising a desiccant main bag and a humidity indicator auxiliary bag; the desiccant main bag comprises a desiccant and a first breathable packaging bag wrapping the desiccant; the humidity indicator auxiliary bag comprises a humidity indicator and a second transparent breathable packaging bag for wrapping the humidity indicator;
the desiccant primary bag and the humidity indicator secondary bag are arranged through the following steps:
1) setting a designated failure point of a main desiccant bag, and setting the moisture permeation rate of the main desiccant bag to obtain the designated failure time of the corresponding main desiccant bag;
2) the moisture permeation rate of the humidity indicator secondary package and the color mutation point of the humidity indicator are adjusted, so that the color mutation time of the humidity indicator in the humidity indicator secondary package is smaller than or equal to the specified failure time of the desiccant primary package.
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| CN2350753Y (en) * | 1998-12-30 | 1999-11-24 | 戴新华 | Effective indicating device for desiccant |
| CN101119898A (en) * | 2005-02-07 | 2008-02-06 | 共同印刷株式会社 | Packaging bag with moisture absorption indicator function and drying agent |
| CN201658938U (en) * | 2009-09-29 | 2010-12-01 | 中日特种纸厂股份有限公司 | Humidity indicating drier |
| CN207497240U (en) * | 2017-07-10 | 2018-06-15 | 青岛乐源包装有限公司 | A kind of barrier material packaging bag |
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