With the reform and opening up to promote the development of technology, in the packaging field, flexible packaging has become an integral part of the package. In terms of storage of specialty gases, metal steel plates are used as packaging containers for many years. Along with the rapid development of high technology, they have been associated with environmental protection science, electronic technology, defense industry, aerospace industry, food industry, metallurgical industry, chemical industry, Analytical instrumentation adjustments and other industries are not suitable to make it gradually change and update.
Due to the stringent nature of the storage of specialty gases and standard gases, the gas in the metal laden container produces a certain chemical reaction, especially the change of the concentration of the standard gas components stored, which affects the calibration of analytical instrumentation and the amount of gas detection. Bring errors and even seriously affect the supervision and detection of gases, and thus vigorously promote the research and development of gas flexible packaging.
Although various new types of small gas packaging containers have come out one after another and advanced coating techniques have been adopted, such as metal plating on the inner surface of packaging containers, organic coating, spectral sealing of aluminum alloys, and electrolytic processing of aluminum packaging containers, etc. . Chromium molybdenum steel or aluminum alloy cylinders, aluminum cylinders, plastic air bags, rubber air bags, etc., but the soft packaging containers made of multi-layer composite film is the most attention.
According to foreign data reports, as early as the 1970s European and American countries such as Germany, the United States, Japan and other countries have conducted research and development in this regard, Germany's Linde company developed a variety of multi-layer composite membrane flexible packaging containers, the United States verification The equipment company developed a polyester-aluminum foil composite gas flexible packaging container.
Although composite flexible packaging made of different materials has been widely used in food, meat products, beverages, tea, cosmetics and other fields, the use of flexible packaging for gas storage in China's gas industry, instrumentation industry, electronics industry, aerospace industry, etc. It is a new topic. Flexible packaging has many advantages: small and lightweight, portable, safe transportation, easy to use, low packaging costs, especially with pure gas and standard gas values, stable and reliable, and it is very beneficial to use in underdeveloped areas where traffic is inconvenient.
The gas flexible packaging container made of multi-layer composite film must be composed of a flexible metal foil with high flexibility, which will not swell due to changes in the external environment, and a multilayer plastic film lined with a polyethylene film (or other Molecularly stable plastic film) made by thermoforming and equipped with input gas and withdrawn gas in its flexible packaging container, can be used multiple times (usually used for soft gas at low concentration can be reused for high concentration gas Storage, conversely for high concentrations can not generally be used for low-concentration gas).
In summary, the use of gas flexible packaging, must have the following characteristics requirements: soft and elastic (not subject to changes in the external climate conditions change the surface); strong airtight tightness test does not allow leakage phenomenon; have 50 More than °C heat resistance; with 0.3 bar (1 bar = pressure above 105 Pa; storage standard gas (fraction concentration of 10ppm-5%V/V, the component concentration is stable, no change, storage High purity purity of the above gas, will not affect the purity; with a good seal rubber diaphragm and a small valve for inflation and gas.
When using gas flexible packaging, users are most concerned about: whether the concentration of the gas components it stores will change; whether the soft film inner wall will produce adsorption; whether certain trace components in the standard gas will undergo performance changes, impact Calibration and so on. Regarding the above problems, when developing and using gas flexible packaging at home and abroad, a number of reliability tests and tests are performed on the materials and containers while conducting feasibility studies, and chromatographic and other high-precision instruments are tested on the stored gas.
For example, Linde Corporation uses propane, n-butane, n-hexane, and high-purity nitrogen (99.999% V/V) as the bottom gas in the gas soft packaging produced by it to be assigned to ppm grade (10-6V/V). In the mixed gas of 1,3-butadiene, vinyl chloride, or freon-21, the concentration of the components in the mixture is tested within a few weeks of storage, and the maximum concentration of the component changes is 1 ppm (1×10-6 V/V). V).
The soft-packaging of polyester-aluminum foil composite membranes manufactured by U.S. Calibration Equipment Co., Ltd. collects phosphine in the air during environmental monitoring and conducts stability tests. The result of the test is a phosphine concentration of 0.1ppb (1×10- 9V/V), the component concentration changes within ± 4%, within the allowable error range, the experiment shows that the phosphine gas that is active on chemical properties can also be stored in such flexible packaging for more than one month.
The National Institute of Chemical Industry also conducted a stability test on gas flexible packaging, storing argon gas as the bottom gas for methane, nitrogen as the bottom gas for carbon monoxide, argon as the bottom gas for carbon dioxide, and hydrogen as the bottom gas. Carbon dioxide and carbon dioxide as the bottom gas with oxygen and other five kinds of standard gas mixture, the experimental results show that the change of its component concentration values ​​are within the scope of the analysis error.
Another chemical research and design institute in China also conducts stability test experiments. The ethane in the hydrogen, phosphine in the nitrogen, and methane in the nitrogen are all within the analysis error range, indicating that the gas flexible package is a standard gas mixture that can adapt to the special gas. The storage was therefore determined by the American Society of Materials Testing as a standard sampling and dilution valve. After several years of use, it basically reached the goals and requirements proposed during the discussion and development.
It must also be pointed out here that a gas flexible package made of a composite membrane cannot be fully applied to all gases, mixtures of different concentrations, and standard gas, and should be stored according to the Wang Tong of the material to adapt to different types and concentrations of the mixture and Standard gas, materials that have been tested for gas stability include: polyvinyl chloride, polyethylene, polypropylene, polytetrafluoroethylene, polychlorotrifluoroethylene, polyester film, polyvinyl chloride resin, etc. The development of new materials will continue to increase the variety of flexible packaging of gases.
Because of its special advantages, the soft packaging of the gas has very promising prospects: gas flexible packaging can replace bulky steel cylinders and fragile glass to store and transport gases, especially for on-site monitoring of sample storage and simplified instrumentation. Instrument calibration work; can be used as a special diluent gas container, but also in a special case, the preparation of standard gas; can easily collect or store a small amount of reaction component gas; easy to carry, especially on-site gas sample extraction; Preservative gas storage for green foods (eg fruits, vegetables, food, food, etc.).
Flexible packaging has been widely used in food, fruits, meat, aquatic products, beverages, vegetables, etc. Due to its superiority, it has accelerated the development of flexible packaging materials. There are many composite membrane materials, such as aluminum film composite film of polyester film, biaxially oriented polypropylene film aluminum composite film, polyethylene/polyvinyl alcohol/polypropylene composite film, polyester/polypropylene composite film and so on.
In recent years, many new varieties of composite membranes have been developed, which are no longer listed one by one. This creates favorable conditions for the selection of gas flexible packaging materials, and also lays a good foundation for gas flexible packaging. Therefore, when selecting materials, one must choose to have no air permeability, high toughness strength, and very weak adsorption (especially low molecular adsorption value). Corrosion resistant composite film.
In order to reduce costs, it can be used multiple times. It must be reliable for flexible packaging rubber diaphragms or small air valves. It cannot be leaked when it is used as a sealing test. With the vigorous development of industries such as gas, electronics, defense, metallurgy, aerospace and other industries. Gas flexible packaging will also have a bright future.
Note: The mixture gas formulated during the gas flexible packaging experiment uses high-purity gas (99.999% V/V) as the bottom gas.
Due to the stringent nature of the storage of specialty gases and standard gases, the gas in the metal laden container produces a certain chemical reaction, especially the change of the concentration of the standard gas components stored, which affects the calibration of analytical instrumentation and the amount of gas detection. Bring errors and even seriously affect the supervision and detection of gases, and thus vigorously promote the research and development of gas flexible packaging.
Although various new types of small gas packaging containers have come out one after another and advanced coating techniques have been adopted, such as metal plating on the inner surface of packaging containers, organic coating, spectral sealing of aluminum alloys, and electrolytic processing of aluminum packaging containers, etc. . Chromium molybdenum steel or aluminum alloy cylinders, aluminum cylinders, plastic air bags, rubber air bags, etc., but the soft packaging containers made of multi-layer composite film is the most attention.
According to foreign data reports, as early as the 1970s European and American countries such as Germany, the United States, Japan and other countries have conducted research and development in this regard, Germany's Linde company developed a variety of multi-layer composite membrane flexible packaging containers, the United States verification The equipment company developed a polyester-aluminum foil composite gas flexible packaging container.
Although composite flexible packaging made of different materials has been widely used in food, meat products, beverages, tea, cosmetics and other fields, the use of flexible packaging for gas storage in China's gas industry, instrumentation industry, electronics industry, aerospace industry, etc. It is a new topic. Flexible packaging has many advantages: small and lightweight, portable, safe transportation, easy to use, low packaging costs, especially with pure gas and standard gas values, stable and reliable, and it is very beneficial to use in underdeveloped areas where traffic is inconvenient.
The gas flexible packaging container made of multi-layer composite film must be composed of a flexible metal foil with high flexibility, which will not swell due to changes in the external environment, and a multilayer plastic film lined with a polyethylene film (or other Molecularly stable plastic film) made by thermoforming and equipped with input gas and withdrawn gas in its flexible packaging container, can be used multiple times (usually used for soft gas at low concentration can be reused for high concentration gas Storage, conversely for high concentrations can not generally be used for low-concentration gas).
In summary, the use of gas flexible packaging, must have the following characteristics requirements: soft and elastic (not subject to changes in the external climate conditions change the surface); strong airtight tightness test does not allow leakage phenomenon; have 50 More than °C heat resistance; with 0.3 bar (1 bar = pressure above 105 Pa; storage standard gas (fraction concentration of 10ppm-5%V/V, the component concentration is stable, no change, storage High purity purity of the above gas, will not affect the purity; with a good seal rubber diaphragm and a small valve for inflation and gas.
When using gas flexible packaging, users are most concerned about: whether the concentration of the gas components it stores will change; whether the soft film inner wall will produce adsorption; whether certain trace components in the standard gas will undergo performance changes, impact Calibration and so on. Regarding the above problems, when developing and using gas flexible packaging at home and abroad, a number of reliability tests and tests are performed on the materials and containers while conducting feasibility studies, and chromatographic and other high-precision instruments are tested on the stored gas.
For example, Linde Corporation uses propane, n-butane, n-hexane, and high-purity nitrogen (99.999% V/V) as the bottom gas in the gas soft packaging produced by it to be assigned to ppm grade (10-6V/V). In the mixed gas of 1,3-butadiene, vinyl chloride, or freon-21, the concentration of the components in the mixture is tested within a few weeks of storage, and the maximum concentration of the component changes is 1 ppm (1×10-6 V/V). V).
The soft-packaging of polyester-aluminum foil composite membranes manufactured by U.S. Calibration Equipment Co., Ltd. collects phosphine in the air during environmental monitoring and conducts stability tests. The result of the test is a phosphine concentration of 0.1ppb (1×10- 9V/V), the component concentration changes within ± 4%, within the allowable error range, the experiment shows that the phosphine gas that is active on chemical properties can also be stored in such flexible packaging for more than one month.
The National Institute of Chemical Industry also conducted a stability test on gas flexible packaging, storing argon gas as the bottom gas for methane, nitrogen as the bottom gas for carbon monoxide, argon as the bottom gas for carbon dioxide, and hydrogen as the bottom gas. Carbon dioxide and carbon dioxide as the bottom gas with oxygen and other five kinds of standard gas mixture, the experimental results show that the change of its component concentration values ​​are within the scope of the analysis error.
Another chemical research and design institute in China also conducts stability test experiments. The ethane in the hydrogen, phosphine in the nitrogen, and methane in the nitrogen are all within the analysis error range, indicating that the gas flexible package is a standard gas mixture that can adapt to the special gas. The storage was therefore determined by the American Society of Materials Testing as a standard sampling and dilution valve. After several years of use, it basically reached the goals and requirements proposed during the discussion and development.
It must also be pointed out here that a gas flexible package made of a composite membrane cannot be fully applied to all gases, mixtures of different concentrations, and standard gas, and should be stored according to the Wang Tong of the material to adapt to different types and concentrations of the mixture and Standard gas, materials that have been tested for gas stability include: polyvinyl chloride, polyethylene, polypropylene, polytetrafluoroethylene, polychlorotrifluoroethylene, polyester film, polyvinyl chloride resin, etc. The development of new materials will continue to increase the variety of flexible packaging of gases.
Because of its special advantages, the soft packaging of the gas has very promising prospects: gas flexible packaging can replace bulky steel cylinders and fragile glass to store and transport gases, especially for on-site monitoring of sample storage and simplified instrumentation. Instrument calibration work; can be used as a special diluent gas container, but also in a special case, the preparation of standard gas; can easily collect or store a small amount of reaction component gas; easy to carry, especially on-site gas sample extraction; Preservative gas storage for green foods (eg fruits, vegetables, food, food, etc.).
Flexible packaging has been widely used in food, fruits, meat, aquatic products, beverages, vegetables, etc. Due to its superiority, it has accelerated the development of flexible packaging materials. There are many composite membrane materials, such as aluminum film composite film of polyester film, biaxially oriented polypropylene film aluminum composite film, polyethylene/polyvinyl alcohol/polypropylene composite film, polyester/polypropylene composite film and so on.
In recent years, many new varieties of composite membranes have been developed, which are no longer listed one by one. This creates favorable conditions for the selection of gas flexible packaging materials, and also lays a good foundation for gas flexible packaging. Therefore, when selecting materials, one must choose to have no air permeability, high toughness strength, and very weak adsorption (especially low molecular adsorption value). Corrosion resistant composite film.
In order to reduce costs, it can be used multiple times. It must be reliable for flexible packaging rubber diaphragms or small air valves. It cannot be leaked when it is used as a sealing test. With the vigorous development of industries such as gas, electronics, defense, metallurgy, aerospace and other industries. Gas flexible packaging will also have a bright future.
Note: The mixture gas formulated during the gas flexible packaging experiment uses high-purity gas (99.999% V/V) as the bottom gas.
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