CN109795792B - Waterproof breathable paper and waterproof breathable preservative film prepared from same - Google Patents
Waterproof breathable paper and waterproof breathable preservative film prepared from same Download PDFInfo
- Publication number
- CN109795792B CN109795792B CN201711138286.XA CN201711138286A CN109795792B CN 109795792 B CN109795792 B CN 109795792B CN 201711138286 A CN201711138286 A CN 201711138286A CN 109795792 B CN109795792 B CN 109795792B
- Authority
- CN
- China
- Prior art keywords
- paper
- waterproof breathable
- preservative film
- waterproof
- holes
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Abstract
The invention discloses waterproof breathable paper and a waterproof breathable preservative film prepared by the same, wherein the waterproof breathable paper is obtained by hydrophobization treatment of food packaging paper, the contact angle of the waterproof breathable paper is more than or equal to 120 degrees, the thickness of the waterproof breathable paper is 350 mu m, the waterproof breathable paper is fully distributed with breathable holes with the aperture of 15-20 mu m, and the air permeability of the waterproof breathable paper is 3500 plus 6000 ml/min. The waterproof breathable preservative film comprises a preservative film (1) with holes and waterproof breathable paper (2) inlaid on the preservative film holes (3). The invention has simple process and lower cost, has important function on prolonging the storage life or preserving the freshness of the food, and has higher market popularization and application prospect.
Description
Technical Field
The invention belongs to the technical field of food preservation, and particularly relates to waterproof breathable paper and a waterproof breathable preservative film prepared by adopting the same.
Background
Although China is the first big producing country of fruits and vegetables, the commercialization rate after picking is less than 20%, which is far lower than 98% of developed countries. How to improve the fresh-keeping rate of fruits and vegetables in the market and further improve the market competition level of fruits and vegetables in China has important significance.
The fruits and vegetables are still a living body after being picked, various gases and moisture can be generated due to the respiration effect, if the gases and the moisture can generate ripening and aging effects on the fruits and vegetables in a closed environment, and meanwhile, the moisture forms a humid environment to enable bacteria to breed easily and propagate rapidly, so that the fresh fruits and vegetables are quickly over-ripened and rotten.
The bacteria of the watermelon covered by the preservative film are increased by ten times, so that the active attention of people is aroused, the preservative film is covered on the surface of the cut watermelon, and because the preservative film has poor air permeability, a relatively closed space is formed inside the watermelon, the water inside the watermelon is preserved, and a comfortable environment is provided for the propagation of the bacteria. In order to prolong the preservation time and prevent the root from rotting, wholesalers can dip in formaldehyde solution to prolong the preservation time when packaging the baby food, so that the preservation time is prolonged, but the baby food containing formaldehyde is very harmful to the body when eating the baby food.
Based on the above, the waterproof breathable preservative film is searched, harmful gas is discharged, the concentration of the gas in the preservative bag is spontaneously adjusted, and meanwhile, the humidity is reduced, so that the preservative film has great significance for fruit and vegetable preservation.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides waterproof breathable paper and a waterproof breathable preservative film prepared by adopting the paper, which are used for packaging vegetables and fruits so as to realize the preservation of the vegetables and fruits.
In order to achieve the purpose, the invention adopts the following technical scheme:
the waterproof breathable paper is obtained by performing hydrophobic treatment on food packaging paper, the contact angle of the waterproof breathable paper is more than or equal to 120 degrees, the thickness of the waterproof breathable paper is 350 mu m, the aperture of a small hole in the waterproof breathable paper is 15-20 mu m, and the air permeability of the waterproof breathable paper is 3500-6000 ml/min.
Preferably, the food packaging paper is one or more of food filter paper, rice paper, kraft paper, snow pear paper and oil paper.
In the present invention, the hydrophobization treatment specifically includes:
the food packaging paper is placed in a hydrophobization reagent with the pH value of 4.0-5.5 and the concentration of 10-100g/L for soaking three times, and is respectively dried at the temperature of 110-130 ℃, and then is baked for 3-5 minutes at the temperature of 130-170 ℃, and the contact angle is more than or equal to 120 degrees.
Preferably, the hydrophobizing agent is selected from a fluoropolymer, a silane or a paraffin oil.
The invention also provides a waterproof breathable preservative film which comprises a preservative film 1 with holes and the waterproof breathable paper 2 inlaid on the preservative film holes 3.
Preferably, the preservative film holes 3 are arranged on the perforated preservative film 1 in a lattice form.
Preferably, the preservative film hole 3 is circular, oval or square.
The invention relates to a waterproof breathable preservative film which comprises a preservative film with holes and waterproof breathable paper inlaid on the preservative film.
In order to realize the excellent ventilation function, the waterproof ventilation paper is uniformly arranged on the perforated preservative film in a lattice form.
The preservative film with holes is made of Polyethylene (PE), polyvinyl chloride (PVC), polyvinylidene chloride (PVDC) or polypropylene (PP), and the preferable material is Polyethylene (PE).
The base material of the waterproof and breathable paper in the present invention is various wrapping paper such as food filter paper, rice paper, kraft paper, snow pear paper, oil paper, etc., preferably food filter paper, and the waterproof and breathable function can be achieved by subjecting the food filter paper to hydrophobization treatment, and the hydrophobization agent is not limited to a fluorine-containing polymer agent, but includes various silanes, paraffin oil, and other various hydrophobization agents. Preferably fluorine-containing polymer emulsion, the waterproof breathable paper can be obtained by placing food filter paper in the fluorine-containing polymer emulsion with the pH value of 4.0-5.5 and the concentration of 50g/l for three times, respectively drying at the temperature of 110-130 ℃ and then drying at the high temperature of 150 ℃ for 3-5 minutes.
The preservative film with holes and the waterproof breathable paper are bonded by Polyethylene (PE) glue or hot pressing and the like, preferably the PE glue, and the schematic diagram is shown in figure 1.
The waterproof breathable paper preferred in the invention has excellent waterproof and breathable functions, the pore diameter is 15-20 mu m, the air permeability is 3500-6000ml/min, the electron micrograph and the contact angle are shown in figure 2, the contact angle is 140.4 degrees, meanwhile, the waterproof breathable paper has good stability, the folded part still shows excellent hydrophobic performance after folding treatment, and the contact angle is 136.8 degrees, as shown in figure 3. The contact angle was 136.3 ° after 60 days in air, as shown in fig. 4, and still had good hydrophobic properties after 40 days in 100% humidity, and the contact angle was 113.6 °, as shown in fig. 5, all of which showed good stability.
The waterproof breathable paper has excellent water resistance, 5ml of water is placed on the waterproof breathable paper, the water does not penetrate through the hydrophobic paper but only evaporates in the air, the filter paper still has excellent hydrophobic performance after the water is evaporated, and the contact angle of the filter paper is 139.3 degrees.
The waterproof breathable paper has excellent functions of blocking bacteria and dust. 20g/l of NaCl solution is prepared as an aerosol generating solution, an automatic filter (TSI8130) is used as a testing instrument to prepare NaCl aerosol, the median diameter (CMD) of aerosol particles is 0.075 mu m, the geometric standard deviation of particle distribution is 1.86, and the blocking rate of the waterproof breathable paper is 97.12% under the condition that the air flow is 83.1l/min, so that the waterproof breathable paper has an excellent dust and bacteria blocking function.
Compared with the prior art, the waterproof breathable preservative film has excellent air permeability, and can spontaneously adjust O in the preservative bag2And CO2Balance and expulsion of H produced by respiration2O and C2H4When the air is mixed, dust and bacteria in the air can be effectively separated, the preservation time of the fruits and the vegetables is prolonged, the process is simple, and the cost is relatively low.
The invention has the advantage of realizing O spontaneously by utilizing the air permeability of the waterproof breathable paper2And CO2Thereby keeping the balance of the fruit and vegetable gas in the fresh-keeping bag and preventing the fruit and vegetable gas from being generated due to O2The fruits and vegetables with too low concentration can ferment, decay and deteriorate by ethanol generated by anaerobic respiration, and simultaneously can generate H2O and C2H4When the gas is discharged, the bacterium breeding and the fruit and vegetable aging degree in the humid environment are slowed down, so that the preservation time is prolonged.
Drawings
FIG. 1 is a schematic structural view of a waterproof breathable preservative film according to the present invention; FIG. 2 is an electron micrograph and a contact angle of the waterproof and breathable paper of example 1, wherein the contact angle is 140.4 degrees;
FIG. 3 is the contact angle of the waterproof breathable paper of example 1 after folding, which is 136.8 degrees;
FIG. 4 shows the change of the hydrophobic property of the waterproof and breathable paper in air of example 1 with time, the contact angle of the waterproof and breathable paper after being placed for 60 days is still 136.3 degrees, and the waterproof and breathable paper shows excellent continuous stability;
FIG. 5 is a graph showing the change of the contact angle of the waterproof and breathable paper of example 1 with respect to time under the condition of 100% humidity, the contact angle of the waterproof and breathable paper after being placed for 40 days is 113.6 degrees, and good continuous stability is shown;
FIG. 6 is a comparison graph of the effect of the different preservative films of example 2 on keeping bananas and apples fresh;
FIG. 7 is a diagram illustrating the effect of different preservation methods of example 3 on the Chinese cabbage;
FIG. 8 is a graph showing the effect of the embodiment 4 after 12 days of packing mushrooms in different freshness protection packages;
FIG. 9 is a graph showing the effect of the embodiment 5 after the jujube is packed in different freshness protection packages for 10 days;
reference numerals: 1-preservative film with holes and 2-waterproof breathable paper, wherein the waterproof breathable paper and the preservative film are bonded by PE glue or hot pressing and the like.
Detailed Description
The invention is described in further detail below with reference to the figures and the detailed description.
Example 1
As shown in figure 1, the waterproof breathable preservative film comprises a perforated preservative film and waterproof breathable paper, wherein a circular or square hole lattice with the size of 0.5-3cm is prepared on the preservative film through a puncher to obtain the perforated preservative film, food filter paper is placed in fluoropolymer emulsion with the pH value of 4.0-5.5 and the concentration of 50g/l for three times, the emulsion is dried at the temperature of 110-.
The obtained waterproof breathable paper and the folded waterproof breathable paper are subjected to electron microscope scanning and contact angle detection, and the results are shown in fig. 2 and fig. 3, and as can be seen from fig. 2, the contact angle of the waterproof breathable paper is 140.4 degrees, meanwhile, the waterproof breathable paper has good stability, the folded part still shows excellent hydrophobic property after folding treatment, and the contact angle is 136.8 degrees, as shown in fig. 3;
as shown in fig. 4, the hydrophobic property of the waterproof and breathable paper in the air changes with time, the contact angle of the waterproof and breathable paper after being placed for 60 days is still 136.3 degrees, and the waterproof and breathable paper shows excellent continuous stability;
as shown in fig. 5, the contact angle of the waterproof and breathable paper under the condition of 100% humidity changes with time, and after the waterproof and breathable paper is placed for 40 days, the contact angle is 113.6 degrees, so that the waterproof and breathable paper shows good continuous stability;
example 2
Taking storage bananas and apples as an example, two bananas and an apple with the same size are respectively placed in two fruit basins with the diameter of 20cm, and then three PE preservative films of waterproof and breathable paper with the size of 3cm multiplied by 3cm are stuck on one basin cover, wherein the thickness of the preservative film is 6 mu m, and the diameter of a hole is 2cm multiplied by 2 cm. The other pot is covered with a PE preservative film which is not adhered with waterproof breathable paper and has the thickness of 6 mu m, the preservative film of the waterproof breathable paper has no obvious water drops in 5 days and later, a large number of water drops are generated on the common preservative film, and the effect of different preservative films on preserving bananas and apples is shown in figure 6, which shows that the waterproof breathable preservative film has excellent breathability.
Example 3
Taking a storage Chinese cabbage as an example, weighing 8 Chinese cabbages with basically the same size, respectively placing the Chinese cabbages in air (without a film), a sealed freshness protection bag, a 2-hole freshness protection bag, an 8-hole freshness protection bag, an 18-hole freshness protection bag, a freshness protection bag attached with 2 filter papers, a freshness protection bag attached with 8 filter papers and a freshness protection bag attached with 24 filter papers, and then storing the Chinese cabbages in air at room temperature, wherein the freshness protection bag is a delicate and clean thickened freshness protection bag with the size of 35cm multiplied by 25cm, the thickness of 8 mu m and the pore size of 2cm multiplied by 2cm, the filter papers are subjected to hydrophobization treatment, the size of the filter papers is 3cm multiplied by 3cm, and the Chinese cabbages are stored and kept fresh for 31 days, and the result is shown in figure 7, the Chinese cabbages of the 8-filter paper freshness protection bag and the 8-hole freshness protection bag have better freshness protection effect than the 8-hole freshness protection bag when the filter papers are stored for 31 days, and the evaporation effect of the Chinese cabbages in the air can be reduced while, the Chinese cabbage packed by the 2-hole and 2-piece filter membrane freshness protection bags is firstly rotten mainly because the Chinese cabbage is not enough to discharge moisture generated by respiration, is easy to rot and deteriorate under the action of a humid environment, bacteria and oxygen, and is obviously dried and withered when packed by 24-hole and 24-piece filter membrane freshness protection bags.
Example 4
Taking mushroom storage as an example, respectively weighing 8 parts of mushrooms with basically the same size and quantity, respectively placing the mushrooms in air, a sealed freshness protection package, a freshness protection package with 8 holes, a freshness protection package with 18 holes, a freshness protection package attached with 8 filter papers, a freshness protection package attached with 18 filter papers, a freshness protection package attached with 8 kraft papers and a freshness protection package attached with 18 kraft papers, and then storing the mushrooms in air at room temperature, wherein the freshness protection package is a wonderful and thick freshness protection package, the size of the freshness protection package is 30cm × 20cm, the size of the holes is 2cm × 2cm, the thickness of the freshness protection package is 8 μm, the filter papers and the kraft papers are subjected to hydrophobic treatment, the sizes of the filter papers and the kraft papers are 3cm × 3cm, the results after 12 days are shown in fig. 8 and table 1, the freshness protection effect of the 18 filter paper is the best, the mushroom in the air, the freshness protection packages with 8 holes and the 18 holes have obvious dry wilting, and the sealed freshness protection packages of the mushroom bags, the 8 film kraft papers and the 18 film kraft papers have different degrees of rot, of which the sealed freshness protection package decays most severely.
TABLE 1 Effect of shiitake mushrooms packed in different freshness protection bags for 12 days
Example 5
Taking the storage of winter jujubes as an example, respectively weighing 8 parts of winter jujubes with basically the same size and quantity, respectively placing the winter jujubes in air, a sealed freshness protection bag, a freshness protection bag with 8 holes, a freshness protection bag with 18 holes, a freshness protection bag stuck with 8 pieces of filter paper, a freshness protection bag stuck with 8 pieces of kraft paper and a freshness protection bag stuck with 18 pieces of kraft paper, and then storing the freshness protection bags in air at room temperature, wherein the freshness protection bags are delicate thickened freshness protection bags with the size of 25cm multiplied by 17cm, the thickness of 8 mu m and the pore diameter of 0.5cm is multiplied by 0.5cm, the filter paper and the kraft paper are subjected to hydrophobic treatment, the sizes of the filter paper and the kraft paper are 1cm is multiplied by 1cm, the preservation effect after 10 days is shown in figure 9 and table 2, the preservation effect of the 18 filter paper freshness protection package can be seen from figure 9 and table 2 to be optimal, as winter jujubes have strong respiration and are easily damaged by carbon dioxide, a large amount of water vapor is generated on the surface of the freshness protection package of the sealed freshness protection package packaged jujubes and is condensed into water drops, a certain ethanol smell exists after the freshness protection package is opened, and the freshness protection package pasted with the waterproof breathable paper can spontaneously adjust CO in the freshness protection2And O2Can maintain a certain humidity and prevent from being shriveled due to water loss.
TABLE 2 Effect of different freshness protection packages packed jujube for 10 days
Because of the spontaneous regulation function of the gas in the waterproof breathable preservative film, the O in the preservative bag can be spontaneously regulated2And CO2In an amount to maintain O2And CO2The waterproof breathable film has the advantages that the balance of the film is balanced, gases such as water vapor and ethylene can be discharged, the breeding of bacteria and the ripening and aging of the ethylene to fruits and vegetables are reduced, meanwhile, the waterproof breathable film has excellent dust and bacteria blocking functions, the cost price is low, the process is simple, the mechanical strength of the freshness protection package is not affected, and therefore the film has wide market application value.
The above description is only a preferred embodiment of the present invention, and the paper used in the present invention is not limited to food filter paper and kraft paper, but also includes various wrapping papers such as rice paper, snow pear paper, oil paper, etc., the hydrophobic agent is not limited to fluorine-containing polymer agent, but also includes various hydrophobic agents such as various silanes, paraffin oil, etc., the material of the wrap film is not limited to Polyethylene (PE), and also includes various wrap films such as polyvinyl chloride (PVC), polyvinylidene chloride (PVDC), polypropylene (PP), etc., and it is within the scope of the present invention to improve and perfect the process without departing from the principle of the present invention.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and are not limited. Although the present invention has been described in detail with reference to the embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (7)
1. The waterproof breathable paper is characterized by being obtained by hydrophobization treatment of food packaging paper, wherein the contact angle of the waterproof breathable paper is more than or equal to 120 degrees, the thickness of the waterproof breathable paper is 350 mu m, breathable holes with the pore diameter of 15-20 mu m are distributed on the waterproof breathable paper, and the air permeability is 3500 plus 6000 ml/min;
the hydrophobization treatment specifically comprises the following steps:
the food packaging paper is placed in a hydrophobization reagent with the pH value of 4.0-5.5 and the concentration of 10-100g/L for soaking three times, and is respectively dried at the temperature of 110-130 ℃, and then is baked for 3-5 minutes at the temperature of 130-170 ℃, and the contact angle is more than or equal to 120 degrees.
2. The waterproof and breathable paper as claimed in claim 1, wherein the food packaging paper is one or more of food filter paper, rice paper, kraft paper, snow pear paper and oil paper.
3. The waterproof breathable paper according to claim 1, characterized in that said hydrophobizing agent is chosen from fluoropolymers, silanes or paraffin oils.
4. A waterproof breathable preservative film, characterized by comprising a preservative film (1) with holes and the waterproof breathable paper (2) according to claim 1 inserted in the holes (3) of the preservative film.
5. The waterproof breathable preservative film according to claim 4, wherein the preservative film holes (3) are arranged on the perforated preservative film (1) in a lattice form.
6. The waterproof breathable preservative film according to claim 4, wherein the material of the preservative film with holes is one or more of polyethylene, polyvinyl chloride, polyvinylidene chloride and polypropylene.
7. The waterproof breathable preservative film according to claim 4, wherein the preservative film holes (3) are circular, oval or square.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711138286.XA CN109795792B (en) | 2017-11-16 | 2017-11-16 | Waterproof breathable paper and waterproof breathable preservative film prepared from same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711138286.XA CN109795792B (en) | 2017-11-16 | 2017-11-16 | Waterproof breathable paper and waterproof breathable preservative film prepared from same |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109795792A CN109795792A (en) | 2019-05-24 |
| CN109795792B true CN109795792B (en) | 2020-04-14 |
Family
ID=66555528
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711138286.XA Active CN109795792B (en) | 2017-11-16 | 2017-11-16 | Waterproof breathable paper and waterproof breathable preservative film prepared from same |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109795792B (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002191242A (en) * | 2000-12-27 | 2002-07-09 | Nisshoku Corp | Fruit-protecting bag |
| CN202272320U (en) * | 2011-10-13 | 2012-06-13 | 徐寿海 | Air-permeable plastic film |
| JP2013193759A (en) * | 2012-03-19 | 2013-09-30 | Sumitomo Bakelite Co Ltd | Packaging bag for vegetable and fruit, and packaging body for vegetable and fruit |
| CN103407650A (en) * | 2013-07-16 | 2013-11-27 | 达成包装制品（苏州）有限公司 | Waxed aquatic product carton and manufacturing technology thereof |
| CN103946322A (en) * | 2012-10-13 | 2014-07-23 | 东洋铝株式会社 | Water- and oil-repellent coating film and article containing same |
-
2017
- 2017-11-16 CN CN201711138286.XA patent/CN109795792B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002191242A (en) * | 2000-12-27 | 2002-07-09 | Nisshoku Corp | Fruit-protecting bag |
| CN202272320U (en) * | 2011-10-13 | 2012-06-13 | 徐寿海 | Air-permeable plastic film |
| JP2013193759A (en) * | 2012-03-19 | 2013-09-30 | Sumitomo Bakelite Co Ltd | Packaging bag for vegetable and fruit, and packaging body for vegetable and fruit |
| CN103946322A (en) * | 2012-10-13 | 2014-07-23 | 东洋铝株式会社 | Water- and oil-repellent coating film and article containing same |
| CN103407650A (en) * | 2013-07-16 | 2013-11-27 | 达成包装制品（苏州）有限公司 | Waxed aquatic product carton and manufacturing technology thereof |
Non-Patent Citations (1)
| Title |
|---|
| 育果袋纸防水剂的现状及展望;刘伟等;《2005全国造纸化学品开发应用技术研讨会论文集》;20051030;第73-77页 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109795792A (en) | 2019-05-24 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP6796087B2 (en) | Functional film, functional container, and freshness preservation method | |
| Kader et al. | Modified atmosphere packaging of fruits and vegetables | |
| US5458899A (en) | Method of packaging perishable food or horticultural products | |
| CN107183158B (en) | Fruit vegetables flowers card that keeps fresh with fresh-keeping function | |
| US5747082A (en) | Package for perishable food and horticultural products | |
| CN101642161B (en) | Physical method for preserving freshness of waxberry fruits | |
| TW200827262A (en) | Packaging systems for the control of relative humidity of fresh fruits, vegetables and flowers with simultaneous regulation of carbon dioxide and oxygen | |
| TW200810697A (en) | A resealable, reusable plastic storage container and lid with gas-permeable membranes for modified atmosphere storage of food and perishables | |
| WO1993004948A1 (en) | A package for perishable food and horticultural products | |
| Rodov et al. | Modified humidity packaging of fresh produce | |
| CN103988892A (en) | Preservation method of fresh kiwi fruits | |
| CN102422880B (en) | Slow-release preservative for fruits and vegetables and preparation method thereof | |
| Purbey et al. | Advances in packaging of litchi fruit to maintain the quality | |
| CN102550660A (en) | Composite preservation method for prolonging preservation period of fresh chestnut kernels | |
| JPS58193678A (en) | Method of keeping vegetable and food fresh | |
| CN109795792B (en) | Waterproof breathable paper and waterproof breathable preservative film prepared from same | |
| JP6439275B2 (en) | Fruit and vegetable freshness-maintaining packaging bag, package containing fruits and vegetables using the same, and method for maintaining freshness of fruits and vegetables | |
| JPS6094056A (en) | Bag for preserving broccoli sprouts | |
| JP2013035603A (en) | Green soybean freshness keeping packaging bag and method for keeping green soybean fresh using the same | |
| JP2022033793A (en) | Humidifying material for fruit and vegetable, container for storing fruit and vegetable, and preservation method for fruit and vegetable | |
| CN106005763B (en) | A kind of honey peach normal-temperature fresh-keeping packing box and its preparation method and application | |
| JP2018167901A (en) | Package with excellent freshness retaining capacity for fruit and vegetables, and method for retaining freshness of fruit and vegetables | |
| JP2012144278A (en) | Packing bag for fruit and vegetable, and fruit and vegetable packing body | |
| JPS6112246A (en) | Method for packaging vegetable and fruit | |
| CN207595598U (en) | A kind of freshness protection package of air permeable |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |