CN102873970A - Preparation method of preservative film - Google Patents
Preparation method of preservative film Download PDFInfo
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- CN102873970A CN102873970A CN2011101991972A CN201110199197A CN102873970A CN 102873970 A CN102873970 A CN 102873970A CN 2011101991972 A CN2011101991972 A CN 2011101991972A CN 201110199197 A CN201110199197 A CN 201110199197A CN 102873970 A CN102873970 A CN 102873970A
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Abstract
The invention provides a preparation method of a preservative film, which comprises the following steps: irradiating a high-polymer film by ions to obtain a latent track film; coating an adhesive on part of the surface of the latent track film to obtain an intermediate nucleopore film, wherein the part, which is not coated with the adhesive, forms an etching part, and the part, which is coated with the adhesive, forms a bonding part; placing the intermediate nucleopore film in an etching solution for etching to obtain a nucleopore film; coating an adhesive on the surface on an intermediate matrix film, and making the part coated with adhesive into a partial hollow structure to obtain a matrix film; and bonding the nucleopore film on the hollow part of the matrix film. The preservative film through which different gases permeate can be prepared through controlling the heavy ion irradiation condition, the etching condition as well as the size of the etching part, so that the possibility that packaged foods suffer from physiological diseases such as anaerobic respiration and damage caused by carbon dioxide are reduced, moisture condensation and external microorganism invasion are prevented effectively, and the quality guarantee period of the fresh products are prolonged.
Description
Technical field
The present invention relates to the packaging for foodstuff field, 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 a large amount of vitamin and mineral matters is provided, 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 in transporting procedures the shorter or product of undressed fresh vegeto-animal shelf life is larger, and this is because fresh animals and plants are carrying out complicated vital movement constantly.Such as plants such as fruits and vegetables, its respiration is main on the storage property impact of fruits and vegetables, and the organic matters such as carbohydrate in the fruits and vegetables by the catalytic action oxidation Decomposition of enzyme, produce carbon dioxide and water under oxygen participates in, also discharge simultaneously a large amount of energy; Simultaneously, 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, qualitative change constantly occurs in the form of fruits and vegetables, quality, color and luster and nutriment, wilts at last, rots, and loses edibility.Meat can rot because of the pollution of microorganism and the impact of dioxygen oxidation in storage.
In order to prolong 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.The preservation to food of preservative film is: prevent that moisture from distributing and starvation, reduce respiration.But for most fresh food, it need to carry out the gas exchange with the external world just can obtain more fresh-keeping effect, but existing packaging film Air permenbility is lower, and the gas regulation amount is difficult control also, and the shelf-life is shorter.
Summary of the invention
The technical problem of the present invention's solution is to provide a kind of preparation method of preservative film, can regulate the inside and outside gas exchange of packing by the preservative film of the method preparation, with the shelf-life of prolongation to fresh product, thereby 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:
The heavy ions macromolecule membrane obtains the track membranes of diving;
At described latent track membranes surface portion application of adhesive, obtain the 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;
Place etching solution to carry out etching described intercalated nucleus pore membrane, obtain nucleopore membranes;
At middle base film surface application of adhesive, do the part hollow out at the position that is 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, and described etching solution is that concentration is the sodium hydroxide solution of 2M～9M.
Preferably, described etched temperature is 50 ℃～90 ℃.
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 applies for printing.
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 nanometers～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 is to prepare respectively first nucleopore membranes and base film, and the hollow out position that then nucleopore membranes is bonded in base film obtains preservative film, and wherein the preparation method of nucleopore membranes is: at first prepare the track membranes of diving, then the part gluing carries out etching at last; The preparation method of base film is: at first to middle base film gluing, then in gluing position part hollow out.The present invention can prepare the nucleopore membranes that gas with various is had certain transmitance by control heavy ion irradiation condition and etched condition, and then improves the gas selection permeability of preservative film, and realizes that gas permeation rate is adjustable; Simultaneously the present invention can accurately control area and the shape at the ventilative position of preservative film to the operation of the track membranes elder generation gluing after etching of diving, therefore, in the situation that micropore size and quantity are certain, the size adjustment preservative film that the present invention can be by regulating the etching area gas with various is had certain Air permenbility.In sum, prepare preservative film according to the method for the invention provides, can prepare the preservative film that gas with various is had different Air permenbilities according to different products, effectively reduce the probability of the physiological diseases such as packaged food generation anaerobic respiration and carbon dioxide injury, and effectively Antidewing and external microbe infect, and then prolong the shelf-life of fresh product.
Description of drawings
Fig. 1 is the structural representation of intercalated nucleus pore membrane;
Fig. 2 is the nucleopore membranes structural representation.
The specific embodiment
In order further to understand the present invention, below in conjunction with embodiment the preferred embodiment of the invention is described, but should be appreciated that these describe just as further specifying the features and advantages of the present invention, rather than to the restriction of claim of the present invention.
The embodiment of the invention discloses a kind of preparation method of preservative film, comprising:
The heavy ions macromolecule membrane obtains the track membranes of diving;
At described latent track membranes surface portion application of adhesive, obtain the 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;
Place etching solution to carry out etching described intercalated nucleus pore membrane, obtain nucleopore membranes;
At middle base film surface application of adhesive, do the part hollow out at the position that is covered with adhesive, obtain base film;
Described nucleopore membranes is bonded in the hollow out position of described base film.
By such scheme as can be known, preparation method provided by the invention prepares respectively first nucleopore membranes and base film, then the two is carried out bondingly obtaining after compound.Base film is used for product and external environment is isolated, plays 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, be used for to adjust the gas-premeable of preservative film, guaranteeing building best fresh-keeping environments as product, and nucleopore membranes can also be in ventilative isolated microorganism, prevent that microorganism from contaminating the preservative film material.
Nucleopore membranes has another name called track-etching-film, and this kind film utilizes heavy particle irradiation and track etching technology to be prepared from.Nucleopore membranes is provided with some micropores, its principle that forms micropore is as follows: use the heavy ions macromolecule membrane, if the range of heavy ion is greater than thickness, then it on the path of process, because the ionization of charged particle, excite or with the collision of target nucleus, the molecular structure of original material is destroyed, and the long-chain fracture also generates free radical etc., and then has formed one and be referred to as the narrow radiation injury district of " track of diving ".The chemical property of damage zone material is active, when with the chemical solvent etching, because therefore the etching speed of damage zone, behind the etching certain hour, forms cylindrical cavity, i.e. micropore in damaged portion greater than the etching speed of damage zone not.The hole density of microporous barrier can be determined by HIB intensity of flow and irradiation time.The large I of micropore size by control irradiation and etching parameter, can be prepared the nucleopore membranes of different size by the chemical etching conditional decision.
The present invention selects the reason of nucleopore membranes to be following 4 points:
At first, nucleopore membranes has the good selective ability that sees through.All substances greater than the nucleopore membranes aperture can be intercepted at outside the nucleopore membranes, and the aperture of nucleopore membranes micropore, micro-pore shape and micropore direction can regulate by control irradiation and etching parameter, select permeability high and adjustable;
Secondly, nucleopore membranes has preferably chemical stability and heat endurance, can be acidproof and the erosion of most organic solvents, the preferred PET nucleopore membranes that adopts, most organic solvents such as it almost can anti-hydrocarbon, alcohol, ether, acid, ester, halogenated hydrocarbons are the good substitutes of microporous teflon membran;
Again, the nucleopore membranes biologically inert is good, is inertia such as PC and PET nucleopore membranes to microorganism, neither be subjected to the erosion of microorganism, because solable matter is atomic, do not suppress biological breeding again, thereby can under wet environment, work for a long time on the one hand, be quite safe to biology on the other hand;
At last, nucleopore membranes also has preferably mechanical strength, repeatedly bending fold and not damaged fracture.
Among the present invention in the preparation section of nucleopore membranes, it is to adopt first the latent track membranes of heavy ions macromolecule membrane preparation, then make the intercalated nucleus pore membrane at latent track membranes 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; Place etching solution to carry out etching the intercalated nucleus pore membrane at last, the bonding part part only has etched part to form penetrating micropore under the effect of etching solution owing to there being the protection of adhesive to fail to form penetrating micropore, obtains thus nucleopore membranes as shown in Figure 2.
The effect of application of adhesive not only is convenient follow-up bonding compound working procedure before to the track membranes etching of diving, it also is used for the precisely size of control etching area, film has preferably mechanical property in the time of simultaneously can also guaranteeing to apply, and makes it applicable to industrialized mass.Etched part forms micropore after etching, in the situation that micropore size and quantity are certain, and can be by regulating the fresh-keeping Gas permeation of size adjustment of etching area.
In addition, application of adhesive also can be controlled the shape of etching section before etching, and the shape of etching section has determined the shape of nucleopore membranes with the micropore position, and etching section is upper owing to having many micropores after etching, etched part is white under the effect of light scattering, is easy to distinguish with base film.Utilize this characteristic, the present invention preferably controls the shape of etching section by the shape of application of adhesive, and then the effect of playing prompting or indicating.As preferred version, etching section is shaped as shape of product, helps the consumer to get information about the most suitable fresh products type of preservative film.As herein describedly identically with the fresh products shape refer to identically with the fresh products shape or close, close degree is enough to signify product type.Perhaps, the fresh-keeping and false proof requirement of product is satisfied in being shaped as by the sign of fresh products factory of etched part simultaneously.
In preservative film, the steam of fresh animals and plants inside can spread to the external world gradually, if preservative film is lower to the transmitance of steam, steam is difficult in time diffuse out preservative film, steam can condense into the globule on the preservative film surface, hereinafter to be referred as dewfall, dewfall provides the environment that is suitable for growing for microbial growth, and expedite product addles thus.
After use is packed fresh animals and plants according to the preservative film of the inventive method preparation, the steam that interiors of products diffuses out can pass through the micropore of nucleopore membranes to the preservative film external diffusion, therefore the dewfall on the preservative film surface can leave gradually, slows down the speed of growing of microorganism in the packaging film.
The speed that dewfall leaves at preservative film and the weight of product and nature parameters thereof such as transpiration rate, respiratory intensity etc. are directly proportional.Therefore, those skilled in the art can design the distribution situation of nucleopore membranes on base film according to kind and the weight of concrete packaging product, control thus preservative film product is had suitable steam diffusivity.The present invention preferably on base film the hollow out aperture be 0.4～0.6 centimetre circle, 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 exchange.For food such as fresh fruits and vegetables, meat, fish or plants, too high or oxygen content is crossed when low when the package interior carbon dioxide, and inner food can produce anaerobic respiration and cause quality to change.Therefore, packaging film has material impact to the transmitance of gas with various to product fresh-keeping.The present invention can adjust by adjusting etching condition the size of nucleopore membranes micropore size, and then realizes seeing through the selective of gas; Simultaneously, the present invention also can adjust by adjusting heavy ion strength of flow and irradiation time the density of micropore, and then the transmitance of adjustments of gas.Therefore, can prepare the nucleopore membranes that gas with various is had certain transmitance by control heavy ion irradiation condition and etched condition, further the present invention can realize that preservative film has certain Air permenbility to gas with various by the area of control etched part in the application of adhesive operation.
Those skilled in the art can be by the fresh-keeping mechanism of gas with various to different types of product, can hinder breeding or oxygen energy oxidizing microorganisms and the fat etc. of most aerobic bacteria microorganisms such as high concentration carbon dioxide, select aperture and the quantity of suitable micropore, and realize by adjusting heavy ion irradiation condition and etched condition.Among the present invention, the density of nucleopore membranes micropore is preferably (1 * 10
2～1 * 10
11) hole/m
2, more preferably (4 * 10
5～1 * 10
8) hole/m
2The aperture is preferably 10 nanometers～40 micron, more preferably 0.1～5.0 micron; The advantage of above-mentioned design is: be conducive to isolated external microbe.
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 among the present invention, more preferably adopts PET film or PC film.If adopt PET film or PC film, it is the sodium hydroxide solution of 2M～9M that its etching liquid preferably adopts concentration, the sodium hydroxide solution of 5M～8M more preferably, and etch temperature is preferably 50 ℃～90 ℃, more preferably 60 ℃～80 ℃, 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, the said film price is comparatively cheap, and higher transparency and barrier property are arranged.
Print coating for preferably adopting at dive track membranes surface application of adhesive operation and the coating method in the application of adhesive operation of middle base film surface among the above-mentioned preparation method, this kind coating method is easy to control the shape of gluing, is applicable to suitability for industrialized production.Printing applies and is preferably intaglio printing coating or positioning printing coating.Adhesive can adopt PUR, pressure sensitive adhesive or molten resin.
After obtaining according to the method described above nucleopore membranes and base film, the hollow out position that only needs nucleopore membranes to be bonded in described base film just obtains preservative film, can select according to the type of adhesive for bonding compound mode those skilled in the art.
By such scheme as can be known, in the preservative film according to method preparation of the present invention, base film is used for product and external environment is isolated, plays the effect of obstruct; In addition, base film still carries the carrier of nucleopore membranes, and nucleopore membranes is provided with nucleopore, be used for adjusting the gas-premeable of preservative film, guaranteeing building best fresh-keeping environments as product, and nucleopore membranes can also be in ventilative isolated microorganism, prevent that microorganism from contaminating the preservative film material.Therefore, can adjust gas exchange inside and outside the film according to the preservative film of method provided by the invention preparation, effectively Antidewing and external microbe infect, by the size of hollow-out parts and etching section, the size and number of nucleopore membranes micropore size are carried out the probability that suitable design will effectively reduce the physiological diseases such as packaged food generation anaerobic respiration and carbon dioxide injury, the food spoilage that can prevent simultaneously extraneous putrefactive microorganisms from infecting fully and cause, and then prolong shelf-life of fresh product.
In order further to understand the present invention, below in conjunction with embodiment preservative film preparation method provided by the invention is described, protection scope of the present invention is not limited by the following examples.
Embodiment 1 preparation apple packing preservative film
1, the Ar-40 irradiation thickness of the 22MeV/ nucleon of high energy acclerator acceleration is the PET film 1s of 25 μ m, and forming the Track density of diving is 10
7/ m
2Latent track membranes;
2, the mode with intaglio printing is transferred to PUR on the track membranes of diving, and the part that is covered with PUR on the track membranes of diving forms bonding part, and the part that is not covered with PUR forms etched part, obtains the intercalated nucleus pore membrane.
3, with the etching 20 minutes in 80 ℃, 7M sodium hydroxide solution of the intercalated nucleus pore membrane that obtains of step 2, it is 1 micron micropore that etched part forms the aperture, obtains nucleopore membranes;
4, the mode with positioning printing shifts PUR on it on the base film polyethylene film, will have the PUR place to do the part hollow out again, and hollow out 6 diameters of every square meter that distribute are 0.5 centimetre hole;
5, the nucleopore membranes that step 4 is made is attached at the hollow out position on the basic material polyethylene film, obtains the apple fresh-keeping film 100 ℃ of 1 seconds of hot pressing, and the etching section of this apple fresh-keeping film accounts for 0.01% of whole preservative film area.
Embodiment 2 preparation pork fresh-keeping films
1, the S-32 irradiation thickness of the 5MeV/ nucleon of high energy acclerator acceleration is the PET film of 20 μ m, and forming the Track density of diving is 10
8/ m
2Latent track membranes;
2, the mode with intaglio printing is transferred to PUR on the track membranes of diving, and the part that is covered with PUR on the track membranes of diving forms bonding part, and the part that is not covered with PUR forms etched part, obtains the intercalated nucleus pore membrane.
3, with the etching 10 minutes in 50 ℃, 7M sodium hydroxide solution of the intercalated nucleus pore membrane that obtains of step 2, it is 0.1 micron micropore that etched part forms the aperture, obtains nucleopore membranes;
4, the mode with positioning printing shifts PUR on it on base film PE film, will have the PUR place to do the part hollow out again, and hollow out 10 diameters of every square meter that distribute are 1 centimetre hole;
5, the nucleopore membranes that step 4 is made is attached at the hollow out position on the polyethylene film, obtains the Chinese cabbage preservative film 100 ℃ of 1 seconds of hot pressing, and the etching section of this Chinese cabbage preservative film accounts for 0.05% of whole preservative film area.
Embodiment 3 preparation Chinese cabbage fresh-keeping films
1, reactor fragment irradiation thickness is the PC film 0.1s of 10 μ m, and forming the Track density of diving is (4 * 10
5)/m
2Latent track membranes;
2, the mode with intaglio printing is transferred to PUR on the track membranes of diving, and the part that is covered with PUR on the track membranes of diving forms bonding part, and the part that is not covered with PUR forms etched part, obtains the intercalated nucleus pore membrane.
3, with the etching 15 minutes in 80 ℃, 8M sodium hydroxide solution of the intercalated nucleus pore membrane that obtains of step 2, it is 5 microns micropore that etched part forms the aperture, obtains nucleopore membranes;
4, shift on it with the mode of the positioning printing PETG with dissolving on base film film PP film, will have the PETG place to do the part hollow out again, hollow out 20 diameters of every square meter that distribute are 1 centimetre hole;
5, the nucleopore membranes that step 4 is made is attached at the hollow out position on the basic material polyethylene film, obtains the Chinese cabbage preservative film 80 ℃ of 2 seconds of hot pressing, and the etching section of this Chinese cabbage preservative film accounts for 0.1% of whole preservative film area.
Get respectively the nucleopore membranes that embodiment 1～3 makes, its etched part is carried out the gas-premeable experiment, test result is listed in table 1.
Table 1 nucleopore membranes etched part gas-premeable test result
The preservative film and the PE preservative film that use embodiment 1 to make carry out fresh-keeping packaging test, every 0.5m to apple
2Preservative film packing 1Kg apple, probe temperature is 20 ℃, record different time sections preservative film internal state, test result is listed in table 2.
The fresh-keeping test result of table 2 apple fresh-keeping film
The preservative film and the PE preservative film that use embodiment 2 to make carry out fresh-keeping packaging test, every 0.5m to pork
2Preservative film packing 1Kg pork, probe temperature is 10 ℃, record different time sections preservative film internal state, test result is listed in table 4.
The fresh-keeping test result of table 4 pork preservative film
The preservative film and the carton that use embodiment 3 to make carry out fresh-keeping packaging test, every 0.5m to Chinese cabbage
2Preservative film packing 1Kg Chinese cabbage, probe temperature is 20 ℃, record different time sections preservative film internal state, test result is listed in table 3.
The fresh-keeping test result of table 3 Chinese cabbage preservative film
By the above results as can be known, the preservative film of producing according to method provided by the invention all has preferably fresh-keeping effect to fruit, vegetables and meat, has prolonged the shelf-life of fresh product.
The explanation of above embodiment just is used for helping to understand method of the present invention and core concept thereof.Should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention, can also carry out some improvement and modification to the present invention, these improvement and modification also fall in the protection domain of claim of the present invention.
To the above-mentioned explanation of the disclosed embodiments, make this area professional and technical personnel can realize or use the present invention.Multiple modification to these embodiment will be apparent concerning those skilled in the art, and General Principle as defined herein can be in the situation that do not break away from the spirit or scope of the present invention, in other embodiments realization.Therefore, the present invention will can not be restricted to these embodiment shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.
Claims (10)
1. the preparation method of a preservative film comprises:
The heavy ions macromolecule membrane obtains the track membranes of diving;
At described latent track membranes surface portion application of adhesive, obtain the 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;
Place etching solution to carry out etching described intercalated nucleus pore membrane, obtain nucleopore membranes;
At middle base film surface application of adhesive, do the part hollow out at the position that is covered with adhesive, obtain base film;
Described nucleopore membranes is bonded in the hollow out position of described base film.
2. preparation method according to claim 1, it is characterized in that, 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.
3. preparation method according to claim 1 is characterized in that, described macromolecule membrane is polyester film or polycarbonate membrane, and described etching solution is that concentration is the sodium hydroxide solution of 2M～9M.
4. preparation method according to claim 3 is characterized in that, described etched temperature is 50 ℃～90 ℃.
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 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 applies for printing.
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 nanometers～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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| CN103587173A (en) * | 2013-11-08 | 2014-02-19 | 陈武 | Nuclear track membrane screen, nuclear track membrane screen window and preparation method of nuclear track membrane screen |
| CN104686690A (en) * | 2015-03-31 | 2015-06-10 | 张松波 | Processing technology of high-aroma green tea |
| CN107988796A (en) * | 2017-12-29 | 2018-05-04 | 成都新柯力化工科技有限公司 | A kind of plastic fresh-keeping membrane and preparation method for Kiwi berry packaging |
| 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 |
| CN111527033A (en) * | 2017-12-27 | 2020-08-11 | 富士胶片株式会社 | Agricultural container |
| CN112987077A (en) * | 2021-03-22 | 2021-06-18 | 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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| CN103587173A (en) * | 2013-11-08 | 2014-02-19 | 陈武 | Nuclear track membrane screen, nuclear track membrane screen window and preparation method of nuclear track membrane screen |
| 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 |
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| 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 |
| CN112987077A (en) * | 2021-03-22 | 2021-06-18 | 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 |
| 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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