CN102873970B - The preparation method of preservative film - Google Patents
The preparation method of preservative film Download PDFInfo
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- CN102873970B CN102873970B CN201110199197.2A CN201110199197A CN102873970B CN 102873970 B CN102873970 B CN 102873970B CN 201110199197 A CN201110199197 A CN 201110199197A CN 102873970 B CN102873970 B CN 102873970B
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Abstract
The invention provides a kind of preparation method of preservative film, comprising: ion exposure macromolecule membrane, obtain Latent track film; At Latent track film surface portion application of adhesive, obtain intercalated nucleus pore membrane, the part of the uncoated adhesive of intercalated nucleus pore membrane forms etched part, and the part of application of adhesive forms bonding part; Intercalated nucleus pore membrane is placed in etching solution etch, obtains nucleopore membranes; At middle base film surface application of adhesive, do part hollow out at the position being covered with adhesive, obtain base film; Described nucleopore membranes is bonded in the hollow out position of described base film.The present invention is by controlling heavy ion irradiation condition and the condition of etching and the size of etched part, preservative film gas with various to certain transmitance amount can be prepared, the probability of the physiological diseases such as effective reduction packaged food generation anaerobic respiration and carbon dioxide injury, and effectively prevent condensation and external microbe from infecting, and then extend the shelf-life of fresh product.
Description
Technical field
The present invention relates to food packaging applications, particularly a kind of preparation method of preservative film.
Background technology
The fresh animals and plants food such as fruit, vegetables and meat are requisite cuisines raw materials on people's dining table.Fruits and vegetables are delicious flavour not only, also can be body and provides a large amount of vitamin and mineral matter, and the fiber that it contains promotes to promote body metabolism.Meat then provides protein for human body, for vital movement provides energy.
The probability that problem occurs undressed fresh vegeto-animal shelf life shorter or product in transporting procedures is comparatively large, this is because the fresh animals and plants moment carries out complicated vital movement.As plants such as fruits and vegetables, the storage property impact of its respiration on fruits and vegetables is main, and the organic matters such as the carbohydrate in fruits and vegetables, under oxygen participates in, by the catalytic action oxidation Decomposition of enzyme, produce carbon dioxide and water, also discharge a large amount of energy simultaneously; Meanwhile, the lost meeting of fruits and vegetables moisture impels the increased activity of enzyme, and respiration is also strengthened thereupon.Constantly carry out along with respiratory, constantly there is qualitative change in the form of fruits and vegetables, quality, color and luster and nutriment, finally wilts, rots, lose edibility.Meat can rot because of the pollution of microorganism and the impact of dioxygen oxidation in storage.
In order to extend the quality guarantee period of fresh animals and plants food, the main preservative film that adopts carries out fresh-keeping packaging to fresh animals and plants food now.Existing preservative film is mainly polyethylene (PE) preservative film, polyvinyl chloride (PVC) preservative film or polyvinylidene chloride (PVDC) preservative film.Being the preservation of food of preservative film: prevent moisture from distributing and starvation, reduces respiration.But for most fresh food, it needs to carry out gas exchanges with the external world just can obtain more fresh-keeping effect, but existing packaging film Air permenbility is lower, and gas regulation amount is more difficult control also, and the shelf-life is shorter.
Summary of the invention
The technical problem that the present invention solves is the preparation method providing a kind of preservative film, gas exchanges inside and outside the adjustable packaging of the preservative film prepared by the method, to extend the shelf-life to fresh product, thus reduces the probability that problem occurs product in transporting procedures.
In view of this, the invention provides a kind of preparation method of preservative film, comprising:
Heavy ions macromolecule membrane, obtains Latent track film;
At described Latent track film surface portion application of adhesive, obtain intercalated nucleus pore membrane, the part of the uncoated adhesive of described intercalated nucleus pore membrane forms etched part, and the part of application of adhesive forms bonding part;
Described intercalated nucleus pore membrane is placed in etching solution etch, obtains nucleopore membranes;
At middle base film surface application of adhesive, do part hollow out at the position being covered with adhesive, obtain base film;
Described nucleopore membranes is bonded in the hollow out position of described base film.
Preferably, described macromolecule membrane is polyester film, polycarbonate membrane, polychloroethylene film film, polyvinylidene chloride film, polyvinylidene fluoride film, nitrocellulose membrane, cellulose acetate film, phenoplasts film, polymethacrylates film, PA membrane or polyimide film.
Preferably, described macromolecule membrane is polyester film or polycarbonate membrane, the sodium hydroxide solution of described etching solution to be concentration be 2M ~ 9M.
Preferably, the temperature of described etching is 50 DEG C ~ 90 DEG C.
Preferably, described middle base film is polypropylene screen, polyethylene film, polyester film, polycarbonate membrane or polychloroethylene film film or polyvinylidene chloride film.
Preferably, described adhesive is PUR, pressure sensitive adhesive or molten resin.
Preferably, the mode of described coating is printing coating.
Preferably, the density of described nucleopore membranes micropore is 1 × 10
2hole/m
2~ 1 × 10
11hole/m
2.
Preferably, the aperture of described nucleopore membranes micropore is 10 nanometer ~ 40 micron.
Preferably, the shape of described etched part is identical with shape of product.
The invention provides a kind of preparation method of preservative film, it first prepares nucleopore membranes and base film respectively, and the hollow out position then nucleopore membranes being bonded in base film obtains preservative film, and wherein the preparation method of nucleopore membranes is: first prepare Latent track film, then part gluing, finally etches; The preparation method of base film is: first to middle base film gluing, then in gluing site portion hollow out.The present invention can prepare nucleopore membranes gas with various to certain transmitance by the condition controlling heavy ion irradiation condition and etching, and then improves the gas selective penetrated property of preservative film, and it is adjustable to realize gas permeation rate; The operation of simultaneously the present invention to the first gluing after etching of Latent track film accurately can control preservative film and to breathe freely the area at position and shape, therefore, when micropore size and quantity certain, the present invention can by regulate etching area size adjustment preservative film to gas with various, there is certain Air permenbility.In sum, preservative film is prepared according to the method for the invention provides, preservative film gas with various to different Air permenbility can be prepared according to different products, the probability of the physiological diseases such as effective reduction packaged food generation anaerobic respiration and carbon dioxide injury, and effectively prevent condensation and external microbe from infecting, and then extend the shelf-life of fresh product.
Accompanying drawing explanation
Fig. 1 is the structural representation of intercalated nucleus pore membrane;
Fig. 2 is nucleopore membranes structural representation.
Detailed description of the invention
In order to understand the present invention further, below in conjunction with embodiment, the preferred embodiment of the invention is described, but should be appreciated that these describe just for further illustrating the features and advantages of the present invention, instead of limiting to the claimed invention.
The embodiment of the invention discloses a kind of preparation method of preservative film, comprising:
Heavy ions macromolecule membrane, obtains Latent track film;
At described Latent track film surface portion application of adhesive, obtain intercalated nucleus pore membrane, the part of the uncoated adhesive of described intercalated nucleus pore membrane forms etched part, and the part of application of adhesive forms bonding part;
Described intercalated nucleus pore membrane is placed in etching solution etch, obtains nucleopore membranes;
At middle base film surface application of adhesive, do part hollow out at the position being covered with adhesive, obtain base film;
Described nucleopore membranes is bonded in the hollow out position of described base film.
From such scheme, preparation method provided by the invention first prepares nucleopore membranes and base film respectively, obtains after then the two being carried out bonding compound.Base film be used for by product and external environment isolated, play the effect of obstruct.In addition, nucleopore membranes is compound in the hollow-out parts of base film, and base film still carries the carrier of nucleopore membranes.Nucleopore membranes is provided with micropore, and for adjusting the gas-premeable of preservative film, to ensure as product builds best fresh-keeping environments, and nucleopore membranes can also completely cut off microorganism while ventilative, prevents microorganism from contaminating preservative film material.
Nucleopore membranes has another name called track-etching-film, and this kind of film utilizes heavy particle irradiation and track-etch technique to be prepared from.Nucleopore membranes is provided with some micropores, its principle forming micropore is as follows: use heavy ions macromolecule membrane, if the range of heavy ion is greater than thickness, then it process path on, due to charged particle ionization, excite or with the collision of target nucleus, the molecular structure of original material is destroyed, and long-chain ruptures and generates free radical etc., and then defines the narrow radiation injury district that is referred to as " Latent track ".The chemical property of damage zone material is active, and when etching with chemical solvent, the etching speed due to damage zone is greater than the etching speed of non-damage zone, therefore, after etching certain hour, forms cylindrical cavity, i.e. micropore in damaged portion.The hole density of microporous barrier can be determined by HIB intensity of flow and irradiation time.The large I of micropore size, by chemical etching conditional decision, by controlling irradiation and etching parameter, can prepare the nucleopore membranes of different size.
The present invention selects the reason of nucleopore membranes to be following 4 points:
First, nucleopore membranes has good selective through ability.The all substances being greater than nucleopore membranes aperture can be intercepted at outside nucleopore membranes, and the aperture of nucleopore membranes micropore, micro-pore shape and micropore direction regulate by control irradiation and etching parameter, and selective penetrated property is high and adjustable;
Secondly, nucleopore membranes has good chemical stability and heat endurance, can the erosion of acidproof and most organic solvent, preferred employing PET nucleopore membranes, it almost can most organic solvent such as resistance to hydrocarbon, alcohol, ether, acid, ester, halogenated hydrocarbons, is the good substitute of microporous teflon membran;
Again, nucleopore membranes biologically inert is excellent, if PC and PET nucleopore membranes is inertia to microorganism, neither by the erosion of microorganism, again because solable matter is atomic, do not suppress biological breeding, thus can work in wet condition for a long time on the one hand, another aspect is quite safe to biology;
Finally, nucleopore membranes also has good mechanical strength, repeatedly bending fold and not damaged fracture.
In the present invention nucleopore membranes preparation section in, it first adopts heavy ions macromolecule membrane to prepare Latent track film, then intercalated nucleus pore membrane is obtained at Latent track film surface portion application of adhesive, the structure of intercalated nucleus pore membrane as shown in Figure 1, the part of the uncoated adhesive of intercalated nucleus pore membrane forms etched part 101, and the part of application of adhesive forms bonding part 102; Finally intercalated nucleus pore membrane is placed in etching solution to etch, bonding part part fails to form penetrating micropore owing to there being the protection of adhesive, only has etched part to form penetrating micropore under the effect of etching solution, obtains nucleopore membranes as shown in Figure 2 thus.
Before etching Latent track film, the effect of application of adhesive is not only to facilitate follow-up bonding compound working procedure, it is also for precisely controlling the size etching area, when can also ensure to apply, film has good mechanical property simultaneously, makes it be applicable to industrialized mass.Etched part forms micropore after etching, when micropore size and quantity certain, can by regulating the permeability of size adjustment preservative film of etching area.
In addition, before etching, application of adhesive also can control the shape in etching portion, and the shape in etching portion determines the shape of nucleopore membranes with micropore position, etching portion through etching after on owing to having many micropores, under the effect of light scattering, etched part is white, is easy to distinguish with base film.Utilize this characteristic, the present invention is preferably by the shape in the shape controlling etching portion of application of adhesive, and then the effect played prompting or indicate.Preferably, the shape in etching portion is shape of product, contributes to consumer and gets information about the fresh products type that preservative film is suitable for the most.As herein described identical with fresh products shape refer to identical with fresh products shape or close, close degree be enough to signify product type.Or the shape of etched part is by the mark of fresh products factory, meets the requirement that product is fresh-keeping and false proof simultaneously.
In preservative film, the steam of fresh animals and plants inside can outwardly spread gradually, if the transmitance of preservative film to steam is lower, steam is difficult to diffuse out preservative film in time, steam can condense into the globule on preservative film surface, hereinafter referred to as condensation, condense as microbial growth provides the environment being suitable for growing, the addling of expedite product thus.
After using the preservative film prepared according to the inventive method to pack fresh animals and plants, the steam that interiors of products diffuses out by the micropore of nucleopore membranes to preservative film external diffusion, therefore the condensation on preservative film surface can leave gradually, and that slows down microorganism in packaging film grows speed.
Weight and nature parameters such as transpiration rate, the respiratory intensity etc. of the speed that leaves on preservative film of condensing and product are directly proportional.Therefore, those skilled in the art can design the distribution situation of nucleopore membranes on base film according to the kind of concrete packaging product and weight, control preservative film thus and have suitable steam diffusivity to product.The present invention preferably on base film hollow out aperture be the circle of 0.4 ~ 0.6 centimetre, the percent opening of hollow-out parts is preferably (1 ~ 10
2) hole/m
2base film.
Different product is different to the requirement of gas exchanges.For food such as fresh fruits and vegetables, meat, fish or plants, when package interior carbon dioxide is too high or oxygen content is too low, inner food can produce anaerobic respiration and cause quality comparison.Therefore, packaging film has material impact to the transmitance of gas with various to the fresh-keeping of product.The present invention is by the size of adjustment etching condition adjustment nucleopore membranes micropore size, and then it is selective to realize through gas; Meanwhile, the present invention is also by the intensity of adjustment heavy ion stream and the density of irradiation time adjustment micropore, and then the transmitance of adjustments of gas.Therefore, can prepare nucleopore membranes gas with various to certain transmitance by the condition controlling heavy ion irradiation condition and etching, further the present invention realizes preservative film by the area controlling etched part in application of adhesive operation and has certain Air permenbility to gas with various.
Those skilled in the art can by the Fresh Keeping Mechanics@of gas with various to different types of product, as high concentration carbon dioxide can hinder breeding or oxygen energy oxidizing microorganisms and the fat etc. of most aerobic bacteria microorganism, select aperture and the quantity of appropriate microporous, and realized by the condition of adjustment heavy ion irradiation condition and etching.In the present invention, the density of nucleopore membranes micropore is preferably (1 × 10
2~ 1 × 10
11) hole/m
2, be more preferably (4 × 10
5~ 1 × 10
8) hole/m
2; Aperture is preferably 10 nanometer ~ 40 micron, is more preferably 0.1 ~ 5.0 micron; The advantage of above-mentioned design is: be conducive to isolated external microbe.
In the present invention, macromolecule membrane preferably adopts polyester (PET) film, Merlon (PC) film, polychloroethylene film (PVC) film, polyvinylidene chloride (PVDC) film, Kynoar (PVDF), nitrocellulose membrane, cellulose acetate film, phenoplasts film, polymethacrylates film, PA membrane or polyimides (Kappton) film, more preferably adopts PET film or PC film.According to PET film or PC film, its etching liquid preferably adopts concentration to be the sodium hydroxide solution of 2M ~ 9M, and be more preferably the sodium hydroxide solution of 5M ~ 8M, etch temperature is preferably 50 DEG C ~ 90 DEG C, be more preferably 60 DEG C ~ 80 DEG C, etch period is preferably 5min ~ 12min.
Middle base film preferably adopts PET film, PC film, polypropylene (PP) film, polyethylene (PE) film, PVC film or PVDC film.More preferably adopt PE film, PP film or PET film, above-mentioned film price is comparatively cheap, and has higher transparency and barrier property.
Print coating for preferably adopting in Latent track film surface application of adhesive operation and the coating method in the application of adhesive operation of middle base film surface in above-mentioned preparation method, this kind of coating method is easy to the shape controlling gluing, is applicable to suitability for industrialized production.Printing coating is preferably intaglio printing coating or positioning printing coating.Adhesive can adopt PUR, pressure sensitive adhesive or molten resin.
After obtaining nucleopore membranes and base film according to the method described above, the hollow out position that only nucleopore membranes need be bonded in described base film just obtains preservative film, and the mode those skilled in the art for bonding compound can select according to the type of adhesive.
From such scheme, in the preservative film prepared according to method of the present invention, base film be used for by product and external environment isolated, play the effect of obstruct; In addition, base film still carries the carrier of nucleopore membranes, and nucleopore membranes is provided with nucleopore, for adjusting the gas-premeable of preservative film, be that product builds best fresh-keeping environments with guarantee, and nucleopore membranes can also completely cut off microorganism while ventilative, prevent microorganism from contaminating preservative film material.Therefore, the preservative film prepared according to method provided by the invention can adjust gas exchanges inside and outside film, effectively prevent condensation and external microbe from infecting, by carrying out suitable design will effectively reduce the probability of the physiological disease such as packaged food generation anaerobic respiration and carbon dioxide injury to the size of hollow-out parts and etching portion, the size and number of nucleopore membranes micropore size, simultaneously can prevent extraneous putrefactive microorganisms from infecting completely and the food spoilage that causes, and then extend the shelf-life of fresh product.
In order to understand the present invention further, be described preservative film preparation method provided by the invention below in conjunction with embodiment, protection scope of the present invention is not limited by the following examples.
Embodiment 1 prepares apple packing preservative film
1, the Ar-40 of the 22MeV/ nucleon of high energy acclerator acceleration irradiates the PET film 1s that thickness is 25 μm, and forming Latent track density is 10
7/ m
2latent track film;
2, be transferred on Latent track film in the mode of intaglio printing by PUR, part Latent track film being covered with PUR forms bonding part, and the part not being covered with PUR forms etched part, obtains intercalated nucleus pore membrane.
3, by the intercalated nucleus pore membrane obtained of step 2 80 DEG C, etching 20 minutes in 7M sodium hydroxide solution, etched part forms the micropore that aperture is 1 micron, obtains nucleopore membranes;
PUR shifts on it by the mode 4, with positioning printing on base film polyethylene film, then PUR place will be had to do part hollow out, and hollow out every square meter 6 diameters that distribute are the hole of 0.5 centimetre;
5, nucleopore membranes obtained for step 4 is attached at the hollow out position on basic material polyethylene film, in 100 DEG C of hot pressing 1 seconds, obtain apple fresh-keeping film, the etching portion of this apple fresh-keeping film accounts for 0.01% of overall preservative film area.
Embodiment 2 prepares pork fresh-keeping film
1, the S-32 of the 5MeV/ nucleon of high energy acclerator acceleration irradiates the PET film that thickness is 20 μm, and forming Latent track density is 10
8/ m
2latent track film;
2, be transferred on Latent track film in the mode of intaglio printing by PUR, part Latent track film being covered with PUR forms bonding part, and the part not being covered with PUR forms etched part, obtains intercalated nucleus pore membrane.
3, by the intercalated nucleus pore membrane obtained of step 2 50 DEG C, etching 10 minutes in 7M sodium hydroxide solution, etched part forms the micropore that aperture is 0.1 micron, obtains nucleopore membranes;
4, shifted on it by PUR in the mode of positioning printing on base film PE film, then PUR place will be had to do part hollow out, hollow out every square meter 10 diameters that distribute are the hole of 1 centimetre;
5, nucleopore membranes obtained for step 4 is attached at the hollow out position on polyethylene film, in 100 DEG C of hot pressing 1 seconds, obtain Chinese cabbage preservative film, the etching portion of this Chinese cabbage preservative film accounts for 0.05% of overall preservative film area.
Embodiment 3 prepares Chinese cabbage fresh-keeping film
1, reactor fragment irradiates the PC film 0.1s that thickness is 10 μm, and forming Latent track density is (4 × 10
5)/m
2latent track film;
2, be transferred on Latent track film in the mode of intaglio printing by PUR, part Latent track film being covered with PUR forms bonding part, and the part not being covered with PUR forms etched part, obtains intercalated nucleus pore membrane.
3, by the intercalated nucleus pore membrane obtained of step 2 80 DEG C, etching 15 minutes in 8M sodium hydroxide solution, etched part forms the micropore that aperture is 5 microns, obtains nucleopore membranes;
4, shift on it with the PETG of the mode of positioning printing by dissolving on base film film PP film, then PETG place will be had to do part hollow out, hollow out every square meter 20 diameters that distribute are the hole of 1 centimetre;
5, nucleopore membranes obtained for step 4 is attached at the hollow out position on basic material polyethylene film, in 80 DEG C of hot pressing 2 seconds, obtain Chinese cabbage preservative film, the etching portion of this Chinese cabbage preservative film accounts for 0.1% of overall preservative film area.
The nucleopore membranes that Example 1 ~ 3 is obtained respectively, carry out gas-premeable experiment to its etched part, test result lists in table 1.
Table 1 nucleopore membranes etched part gas-premeable test result
The obtained preservative film of embodiment 1 and PE preservative film is used to carry out fresh-keeping packaging test to apple, every 0.5m
2preservative film packaging 1Kg apple, probe temperature is 20 DEG C, and state in record different time sections preservative film, test result lists in table 2.
The fresh-keeping test result of table 2 apple fresh-keeping film
The obtained preservative film of embodiment 2 and PE preservative film is used to carry out fresh-keeping packaging test to pork, every 0.5m
2preservative film packaging 1Kg pork, probe temperature is 10 DEG C, and state in record different time sections preservative film, test result lists in table 4.
The fresh-keeping test result of table 4 pork preservative film
The obtained preservative film of embodiment 3 and carton is used to carry out fresh-keeping packaging test to Chinese cabbage, every 0.5m
2preservative film packaging 1Kg Chinese cabbage, probe temperature is 20 DEG C, and state in record different time sections preservative film, test result lists in table 3.
The fresh-keeping test result of table 3 Chinese cabbage preservative film
From the above results, the preservative film produced according to method provided by the invention all has good fresh-keeping effect to fruit, vegetables and meat, extends the shelf-life of fresh product.
The explanation of above embodiment just understands method of the present invention and core concept thereof for helping.It should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention, can also carry out some improvement and modification to the present invention, these improve and modify and also fall in the protection domain of the claims in the present invention.
To the above-mentioned explanation of the disclosed embodiments, professional and technical personnel in the field are realized or uses the present invention.To be apparent for those skilled in the art to the multiple amendment of these embodiments, General Principle as defined herein can without departing from the spirit or scope of the present invention, realize in other embodiments.Therefore, the present invention can not be restricted to these embodiments shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.
Claims (10)
1. a preparation method for preservative film, comprising:
Heavy ions macromolecule membrane, obtains Latent track film;
At described Latent track film surface portion application of adhesive, obtain intercalated nucleus pore membrane, the part of the uncoated adhesive of described intercalated nucleus pore membrane forms etched part, and the part of application of adhesive forms bonding part;
Described intercalated nucleus pore membrane is placed in etching solution etch, obtains nucleopore membranes;
At middle base film surface application of adhesive, do part hollow out at the position being covered with adhesive, obtain base film;
Described nucleopore membranes is bonded in the hollow out position of described base film;
The Latent track density of described Latent track film is (4 × 10
5)/m
2or 10
7/ m
2; Hollow out aperture on described base film is 0.4 ~ 0.6 centimetre, and the percent opening at hollow out position is (1 ~ 10
2) hole/m
2.
2. preparation method according to claim 1, it is characterized in that, described macromolecule membrane is polyester film, polycarbonate membrane, polychloroethylene film, polyvinylidene chloride film, polyvinylidene fluoride film, nitrocellulose membrane, cellulose acetate film, phenoplasts film, polymethacrylates film, PA membrane or polyimide film.
3. preparation method according to claim 1, is characterized in that, described macromolecule membrane is polyester film or polycarbonate membrane, the sodium hydroxide solution of described etching solution to be concentration be 2M ~ 9M.
4. preparation method according to claim 3, is characterized in that, the temperature of described etching is 50 DEG C ~ 90 DEG C.
5. preparation method according to claim 1, is characterized in that, described middle base film is polypropylene screen, polyethylene film, polyester film, polycarbonate membrane or polychloroethylene film or polyvinylidene chloride film.
6. preparation method according to claim 1, is characterized in that, described adhesive is PUR, pressure sensitive adhesive or molten resin.
7. preparation method according to claim 1, is characterized in that, the mode of described coating is printing coating.
8. preparation method according to claim 1, is characterized in that, the density of described nucleopore membranes micropore is 1 × 10
2hole/m
2~ 1 × 10
11hole/m
2.
9. preparation method according to claim 1, is characterized in that, the aperture of described nucleopore membranes micropore is 10 nanometer ~ 40 micron.
10. preparation method according to claim 1, is characterized in that, the shape of described etched part is identical with shape of product.
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| CN103587173B (en) * | 2013-11-08 | 2016-03-02 | 陈武 | The preparation method of a kind of nucleopore membranes yarn, nucleopore membranes screen window and nucleopore membranes yarn |
| CN104686690A (en) * | 2015-03-31 | 2015-06-10 | 张松波 | Processing technology of high-aroma green tea |
| JP6945656B2 (en) * | 2017-12-27 | 2021-10-06 | 富士フイルム株式会社 | Agricultural container |
| CN107988796B (en) * | 2017-12-29 | 2020-08-07 | 成都新柯力化工科技有限公司 | Plastic preservative film for packaging kiwi fruits and preparation method |
| CN108216900A (en) * | 2018-02-06 | 2018-06-29 | 江南大学 | A kind of gas permeability variable controlled atmosphere box and its preservation method |
| CN112987077B (en) * | 2021-03-22 | 2022-06-14 | 中国科学院近代物理研究所 | Low-energy ion beam detection and ion beam current strength self-balancing interlocking control system |
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| US7169451B2 (en) * | 1995-05-30 | 2007-01-30 | Landec Corporation | Gas-permeable membrane |
| CN101941548A (en) * | 2010-09-10 | 2011-01-12 | 中国原子能科学研究院 | Heavy ion nanometer aperture film fresh-keeping bag |
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| US7169451B2 (en) * | 1995-05-30 | 2007-01-30 | Landec Corporation | Gas-permeable membrane |
| CN1201962A (en) * | 1998-06-26 | 1998-12-16 | 清华大学 | Manufacture of anti-faking membrane |
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| CN201886696U (en) * | 2010-10-09 | 2011-06-29 | 清华大学 | Nuclear track anti-fake film |
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