KR101678315B1 - Method of Producing antibacterial Storage containers of an antibacterial master batch containing ionized calcium powder as a raw material - Google Patents
Method of Producing antibacterial Storage containers of an antibacterial master batch containing ionized calcium powder as a raw material Download PDFInfo
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- KR101678315B1 KR101678315B1 KR1020150136261A KR20150136261A KR101678315B1 KR 101678315 B1 KR101678315 B1 KR 101678315B1 KR 1020150136261 A KR1020150136261 A KR 1020150136261A KR 20150136261 A KR20150136261 A KR 20150136261A KR 101678315 B1 KR101678315 B1 KR 101678315B1
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- master batch
- calcium powder
- antimicrobial
- powder
- raw material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D22/00—Producing hollow articles
- B29D22/003—Containers for packaging, storing or transporting, e.g. bottles, jars, cans, barrels, tanks
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B9/00—Making granules
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/0001—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor characterised by the choice of material
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F1/00—Methods of preparing compounds of the metals beryllium, magnesium, aluminium, calcium, strontium, barium, radium, thorium, or the rare earths, in general
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2023/00—Use of polyalkenes or derivatives thereof as moulding material
- B29K2023/04—Polymers of ethylene
- B29K2023/06—PE, i.e. polyethylene
Abstract
Description
The present invention relates to a method for producing an antimicrobial plastic storage container using an antimicrobial masterbatch containing calcium powder as a raw material. More specifically, the present invention relates to a method for producing an antimicrobial plastic storage container comprising calcium powder, The present invention relates to a method for producing an antimicrobial plastic storage container having excellent antimicrobial activity using a master batch prepared by a surfactant treatment step, a mixing step, and a masterbatch molding step as a raw material.
Recently, resin compositions having antimicrobial properties, so-called antimicrobial resin compositions, have been widely used for building materials, household appliances, miscellaneous goods, packing materials, food manufacturing facilities, drug manufacturing facilities, medical facilities and the like.
The antibacterial agent contained in such an antimicrobial resin composition is highly suitable as an inorganic antibacterial agent because it has higher safety than the organic antibacterial agent, has an antibacterial effect for a long period of time, and is excellent in heat resistance.
These antimicrobial techniques can be divided into a technology group for forming a coating film that gives antimicrobial activity to the surface of a product and a technology group for forming an antimicrobial product including a material showing antibacterial activity in a raw material.
A technique of forming an antimicrobial coating film on the surface of a product has a problem in that the antimicrobial performance is extinguished when the coating film is damaged and the antibacterial performance itself is not constant. In addition, the technology for molding the product containing the antimicrobial material into the raw material is advantageous in that the antibacterial performance is maintained as compared with the coating technology, but the antibacterial ability is not sufficiently realized or the product is difficult to manufacture.
Korean Patent No. 10-1001998 discloses a plastic packaging material containing char and a method for manufacturing the plastic packaging material. More particularly, the present invention relates to a plastic packaging material containing char, It is an object of the present invention to provide a plastic packaging material which has excellent general quality as a plastic packaging material but also contains charcoal and has functions of suppressing decolorizing bacteria, adsorbing polluted particles and odor, emitting far infrared rays and anion, and preventing static electricity The present invention relates to a method for producing a plastic packaging material in which the particle size of the powder charcoal mixed with the resin, the amount used for the resin, and the uniformity of the particle size are adjusted according to the thickness of the plastic packaging material to be molded. However, The antimicrobial activity was measured using Escherichia coli ATCC 25922 93%, which means that the antibacterial activity is insufficient, and the raw material of the product which can be used in food products is insufficient.
SUMMARY OF THE INVENTION Accordingly, the present invention has been made in view of the above problems, and it is an object of the present invention to provide a method for producing a master batch, which comprises washing a shell with alkaline water during the masterbatch manufacturing process and coating the powder after the pulverization with a surfactant, And to provide a method for producing an antibacterial plastic container having a deodorizing and antibacterial function so as to be usable.
Another object of the present invention is to provide an antibacterial plastic container produced by the above method.
In order to solve the above problems and to achieve the object, the present invention provides a method of manufacturing an antimicrobial plastic storage container using an antimicrobial masterbatch containing calcium powder as a raw material, wherein the method comprises the steps of: A surfactant treatment step (S12) for lowering the surface polarity of the inorganic powder particles by surface-treating the inorganic powder particles formed in the calcium powder production step (S11) and the calcium powder production step (S11) A mixing step (S13) of mixing the powder having been subjected to the surfactant treatment step with synthetic resin containing polyethylene, polypropylene, polyurethane or ABS (acrylonitrile-butadiene-styrene resin) in a weight of 35-50 wt% And a master batch forming step of molding the resultant obtained in the mixing step (S13) into spheres or chips Emitter arrangement producing step (S14); The master batch produced in the master batch production step (S14) is mixed with the synthetic resin selected as the raw material resin of the master batch in the previous stage secondarily to prepare a chip-shaped synthetic resin composition S2); And a plastic container manufacturing step (S3) of injection molding the antibacterial plastic container using the synthetic resin composition; .
The calcium powder production step (S11) comprises controlling the rotation speed, shell input amount and firing temperature of the calcining furnace by using a cylindrical firing furnace installed downwardly inclined and rotating by a driving device and maintaining a high temperature state, And a sintering step (S114) for separately preparing food for industrial use and calcium for industrial use.
The sintering step (S114) is a step in which the sintering furnace is thermally insulated by refractory bricks, the length is 18,000 mm and the inside diameter thereof is 900 mm, the rotational speed of the sintering furnace is 35 to 40 rpm, the amount of shell input is 500 kg / And the shell is retained in the calcining furnace for 30 to 45 minutes at a temperature of 1,100 to 1,200 ° C. to produce a food calcium powder having a calcium purity of 95 to 99%
When the rotary speed of the calcining furnace is 30 to 35 rpm, the amount of shell is 300 kg / hr, and the calcining temperature is 1200 ° C or more, the shell is kept in the calcining furnace for 45 to 90 minutes to produce an industrial calcium powder having a purity of 99% .
The cationic surfactant used in the surfactant treatment step S12 is 99% pure and has 12-20 carbon atoms. DODAB (Dioctadecyldimethylammonium bromide), CTAB (Cetyl trimethylammonium bromide), CTAC (cetyl trimethylammonium chloride), DHAB (dihexadecyldimethylammonium bromide).
The shell is subjected to the foreign substance removing step S111 and the washing step S112 three times and the drying step S113 before entering the firing step S114.
A cooling step (S115) in which the shell obtained through the sintering step (S114) is quenched to room temperature, and a milling step (S116) in which the particle size is ground to a size of 3-8 mu m.
In the cleaning step (S114), an ultrasonic cleaning method using a frequency higher than an audible frequency is used, and alkaline water having a pH of 8.5-9.0 is used as cleaning water.
The alkaline water is made by passing the ground water through a filter (not shown) filled with a fine mesh of a crucible powder.
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The polyethylene is either LLDPE (Linear LDPE), HDPE or LDPE.
The method of producing a plastic container containing various food materials such as the present invention is characterized in that calcium powder contained in a master batch to be a material thereof is coated with a surfactant to have excellent antibacterial performance and natural materials are used and an ultrasonic cleaning method is introduced So that the safe storage of the food materials and the prolongation of the storage period can be made possible.
Since the antibacterial performance is concentrated only on the surface of the container, the fermentation rate of the fermented food such as kimchi can be slowed down and the unique crispy texture can be maintained.
In addition, it is possible to reuse the unprocessed and discarded local special products such as cockles and shells of oysters, thereby helping to use available resources and solve environmental problems.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a view schematically showing a method for producing an antibacterial plastic storage container using an antimicrobial master batch containing calcium powder according to the present invention as a raw material. FIG.
2 is a view schematically showing a calcium powder production process.
3 is a photograph of a master batch chip made by a method of manufacturing an antimicrobial masterbatch using calcium powder.
Figs. 4 to 7 are test results obtained from Korean Conformity Laboratories (KCL) for antibacterial tests on general antibacterial plastics which have not been subjected to shelling or embers treatment.
8 to 11 are test reports obtained from Korea Conformity Laboratories (KCL) commissioned by Korea Institute of Construction and Environment Testing (KCL) for antimicrobial testing of films prepared from the antimicrobial masterbatch according to the present invention.
12 to 13 are test reports obtained from Korea Conformity Laboratories (KCL) commissioned for the antibacterial test of a plastic container made from the antimicrobial masterbatch prepared by the invention.
The present invention will be described in detail with reference to the "method for producing an antimicrobial plastic storage container using an antimicrobial master batch containing calcium powder as a raw material" The embodiments and drawings are described. Also, the terms defined in the present specification and claims should not be construed as limiting, but may be changed according to the intention or custom of the operator, and interpreted in terms of meaning and concept consistent with the technical idea of the present invention.
In one aspect of the present invention,
FIG. 1 is a view schematically showing a method of manufacturing an antibacterial plastic storage container using an antimicrobial master batch containing calcium powder according to the present invention as a raw material, FIG. 2 is a view schematically showing a calcium powder production process, Figures 4 to 7 are photographs of a masterbatch chip made by an antimicrobial masterbatch manufacturing method using calcium powder, and Figures 4 to 7 are photographs of a general batch of antimicrobial plastics 8-11 are referred to the Korea Conformity Laboratories (KCL) for the antibacterial activity of the film prepared from the antimicrobial masterbatch prepared by the present invention. 12 to 13 are test reports obtained by Korea Conformity Laboratories (KCL) The test results obtained by the request of antibacterial experiments of the plastic container an antibacterial master batch as a raw material prepared by.
1, in order to solve the above-mentioned problems and to achieve the object, the present invention provides a method for manufacturing an antimicrobial storage container using an antimicrobial master batch containing ionized calcium powder, (S11) for preparing a calcium powder by using a surfactant as a raw material and a surfactant for lowering the surface polarity of the inorganic powder particle by surface-treating the inorganic powder particles formed in the calcium powder production step (S11) with a cationic surfactant Mixing the powder obtained through the treatment step S12 and the surfactant treatment step with a synthetic resin containing polyethylene, polypropylene, polyurethane, or ABS (acrylonitrile-butadiene-styrene resin) in a weight of 35-50 wt% A master batch molding step (S13) and a mixing step (S13) (S14); The master batch produced in the master batch production step (S14) is mixed with the synthetic resin selected as the raw material resin of the master batch in the previous stage secondarily to prepare a chip-shaped synthetic resin composition S2); And a plastic container manufacturing step (S3) of injection molding the antibacterial plastic container using the synthetic resin composition; .
The cationic surfactant used in the surfactant treatment step S12 is 99% pure and has 12-20 carbon atoms. DODAB (Dioctadecyldimethylammonium bromide), CTAB (Cetyl trimethylammonium bromide), CTAC (cetyl trimethylammonium chloride), DHAB (dihexadecyldimethylammonium bromide).
The cationic surfactant should be harmless to human body.
The polyethylene is characterized by being one of LLDPE (Linear LDPE), HDPE and LDPE.
It is needless to say that the antibacterial master batch prepared in the master batch production step (S1) is mixed with LLDPE, ABS, PET,
Referring to FIG. 2, in the calcium powder production step S11, the shell is subjected to a foreign substance removing step S111 and a cleaning step S112 three times and dried in a drying step S113 before the frying step S114, .
The calcium powder production step (S11) comprises controlling the rotation speed, shell input amount and firing temperature of the calcining furnace by using a cylindrical firing furnace installed downwardly inclined and rotating by a driving device and maintaining a high temperature state, And a sintering step (S114) for separately preparing a calcium agent for food and industrial according to the present invention.
The sintering step (S114) is a step in which the sintering furnace is thermally insulated by refractory bricks, the length is 18,000 mm and the inside diameter thereof is 900 mm, the rotational speed of the sintering furnace is 35 to 40 rpm, the amount of shell input is 500 kg / And the shell is retained in the calcining furnace for 30 to 45 minutes at a temperature of 1,100 to 1,200 ° C. to produce a food calcium powder having a calcium purity of 95 to 99%
When the speed of rotation of the calcining furnace is 30 to 35 rpm, the amount of shell is 300 kg / hr, and the calcination temperature is 1,200 ° C or more, the shell is kept in the calcination furnace for 45 to 90 minutes to produce an industrial calcium powder having a purity of 99% .
A cooling step (S115) in which the shell obtained through the sintering step (S114) is quenched to room temperature, and a milling step (S116) in which the particle size is ground to a size of 3-8 mu m.
In the cleaning step (S112), an ultrasonic cleaning method using a frequency higher than an audible frequency is used, and the washing water is preferably alkaline water having a pH of 8.5-9.0.
The alkaline water is made by passing the ground water through a filter filled with a fine mesh of clathrate powder.
Since the alkaline water contains a large amount of potassium, magnesium, sodium and iron, it plays an important role in naturally naturalizing, and can be sterilized against shells contaminated with various pollution and the like.
On the other hand, the alkaline water-producing powder is a mixture of 98% of the alkaline water-containing powder and the rest of which is filled with shell powder such as mussel shell and oyster shell, wherein 35-50% by weight of diaritic powder, 12-30% by weight of zeolite powder, 2 to 20% by weight of the powder and 1 to 20% by weight of the coral powder can be used.
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Referring to FIG. 3, the master batch chip made by the method of manufacturing the antimicrobial master batch using the calcium powder of the present invention is photographed.
The prepared antimicrobial master batch can be applied to various antibacterial lunch boxes, side dishes, trash can, water bottles, various life containers and industrial containers.
- Antimicrobial experiments on general antibacterial plastics.
Inoculated Escherichia coli (strain: Escherichia coli ATCC 8739, initial concentration: 3.4 × 10 ^ 5 CFU / mL) was used as the control. Staphylococcus aureus ATCC 6538P (initial concentration: 2.9 x 10 ^ 5 CFU / mL) was used as an antimicrobial agent, The initial concentration was kept at room temperature and the degree of change after 24 hours was observed.
The results are shown in Table 1 below and the official test report is shown in FIG. 4 to FIG.
Test Items
(CFU / mL)
It can be confirmed that the antimicrobial effect of the antimicrobial plastic generally distributed from this example was surprisingly small.
- Antimicrobial test of the film made from the antimicrobial masterbatch prepared by the present invention as a raw material.
As a raw material for the antimicrobial masterbatch prepared by the present invention, a specimen containing 2% of ionized calcium powder was used as a test specimen of 5 cm x 5 cm. The control specimen was an untreated stomarker film of the same size,
Table 2 below shows the results, and the official test report is shown in Figs. 8 to 11. Fig.
Test Items
(CFU / mL)
From this example, it can be seen that the antibacterial effect of the film produced from the master batch produced by the present invention as a raw material is very remarkable.
These antimicrobial effects are higher than those of other materials with high alkalinity and OH-action, anion and ultraviolet emissivity, and are characterized by high specific surface area due to the characteristics of porous particles.
- Antibacterial experiment of plastic container made from the antimicrobial masterbatch prepared by the present invention as raw material.
The test piece was a plastic container (containing 2% of the ionic calcium powder produced by the present invention) made of the antimicrobial masterbatch prepared by the present invention, and filled with 1 L of tap water in the container and inoculated with the test strain. The bacterial reduction rate was measured on the general antimicrobial plastics for 1-5 days under the same conditions as above. Escherichia coli ATCC 25922 (initial concentration 4.5 x 10 ^ 4 CFU / mL) was used for inoculation.
Table 3 below shows the results and the official test report is shown in Figs. 16-17.
Test Items
It can be confirmed from the present Example that the antibacterial plastic container made from the masterbatch prepared by the present invention as a raw material has a better antimicrobial effect than a general antibacterial plastic container. Further, as compared with Examples 2 to 3, , The antimicrobial effect is actively observed on the surface of the plastic container.
The antimicrobial plastic container made from the masterbatch prepared by the present invention is active only on the surface of the container. Therefore, if kimchi is contained therein, it can prevent overcooking due to excessive fermentation, .
The method of producing a plastic container containing various food materials such as the present invention is characterized in that calcium powder contained in a master batch to be a material thereof is coated with a surfactant to have excellent antibacterial performance and natural materials are used and an ultrasonic cleaning method is introduced So that the safe storage of the food materials and the prolongation of the storage period can be made possible.
Since the antibacterial performance is concentrated only on the surface of the container, the fermentation rate of the fermented food such as kimchi can be slowed down and the unique crispy texture can be maintained.
In addition, it is possible to reuse the unprocessed and discarded local special products such as cockles and shells of oysters, thereby helping to use available resources and solve environmental problems.
S1: Master batch manufacturing step
S11: Calcium powder manufacturing step
S110: Shell entering step S111: Foreign matter removing step
S112: Cleaning step S113: Drying step
S114: firing step S115: cooling step
S116: Grinding process
S12: Surfactant treatment step S13: Mixing step
S14: master batch forming step
S2: Synthetic resin composition preparation step
S3: Antimicrobial plastic container manufacturing step
Claims (9)
The method of manufacturing the plastic storage container
A step of treating the surface of the inorganic powder particles with a cationic surfactant to decrease the surface polarity of the inorganic powder particles and a step of treating the surface of the inorganic powder particles with a surfactant, A mixing step of mixing the powder subjected to the activator treatment step with a synthetic resin containing polyethylene, polypropylene, polyurethane or ABS (acrylonitrile-butadiene-styrene resin) in a weight of 35-50 wt% A master batch forming step of forming a master batch forming step into a spherical or chip form;
A step of preparing a synthetic resin composition in the form of chips having a calcium powder in an amount of 1 to 30% by weight based on the total resin composition by mixing synthetic resin selected from the master batch produced in the master batch manufacturing step as a raw material resin in the master batch in a previous stage; And
A plastic container manufacturing step of injection-molding an antibacterial plastic container using the synthetic resin composition; Wherein the antimicrobial masterbatch contains calcium powder as a raw material.
The calcium powder manufacturing step
The rotation speed, the shell input amount and the firing temperature of the firing furnace are controlled by using a cylindrical firing furnace which is installed at a downward slope and rotates by the drive device and maintains a high temperature state, and the calcium and the industrial calcium agents according to the purity of calcium are continuously And a firing step for separately manufacturing,
Wherein the baking furnace is thermally insulated by refractory bricks and has a length of 18,000 mm and an inner diameter of 900 mm, the rotational speed of the baking furnace is 35 to 40 rpm, the amount of shell is 500 kg / hr, the baking temperature is 1,100 to 1,200 ° C, the shell is kept in the calcining furnace for 30 to 45 minutes to produce a food calcium powder having a calcium purity of 95 to 99%
When the rotary speed of the calcining furnace is 30 to 35 rpm, the amount of shell is 300 kg / hr, and the calcining temperature is 1200 ° C or more, the shell is kept in the calcining furnace for 45 to 90 minutes to produce an industrial calcium powder having a purity of 99% Wherein the antimicrobial master batch contains calcium powder.
The cationic surfactant used in the surfactant treatment step is 99% pure and has 12-20 carbon atoms. Dioctadecyldimethylammonium bromide (DODAB), cetyl trimethylammonium bromide (CTAB), cetyl trimethylammonium chloride (CTAC), dihexadecyldimethylammonium bromide Wherein the antimicrobial master batch contains calcium powder as a raw material.
Wherein the shell has been subjected to a drying process by repeating a foreign substance removal process and a washing process three times before entering the firing process, wherein the antimicrobial master batch containing the calcium powder is used as a raw material.
A step of quenching the shell by the quenching step to a room temperature, and a step of pulverizing the powder to a size of 3-8 mu m. The antimicrobial masterbatch containing the calcium powder Way.
Wherein the cleaning step uses an ultrasonic cleaning method using a frequency higher than an audible frequency, wherein alkaline water having a pH of 8.5-9.0 is used as the washing water. The antimicrobial masterbatch containing calcium powder is used as an antimicrobial plastic storage container Gt;
Wherein the alkaline water is prepared by passing ground water through a filter packed with a microporous formed netting of a copper powder, wherein the alkaline water is prepared from an antimicrobial masterbatch containing calcium powder as a raw material.
Wherein the polyethylene is one of LLDPE (Linear LDPE), HDPE and LDPE, and the antimicrobial masterbatch containing calcium powder is used as a raw material.
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| KR1020150136261A KR101678315B1 (en) | 2015-09-25 | 2015-09-25 | Method of Producing antibacterial Storage containers of an antibacterial master batch containing ionized calcium powder as a raw material |
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| KR1020150136261A KR101678315B1 (en) | 2015-09-25 | 2015-09-25 | Method of Producing antibacterial Storage containers of an antibacterial master batch containing ionized calcium powder as a raw material |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR102481200B1 (en) * | 2022-08-22 | 2022-12-26 | 유재윤 | Food packaging material with excellent food freshness and antibacterial properties and method for manufacturing the same |
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| KR100378875B1 (en) * | 1998-12-09 | 2004-08-16 | 석미수 | Synthetic resin product containing shellfish powder and its manufacturing method |
| KR100818220B1 (en) * | 2007-11-19 | 2008-04-02 | (주)드림라임 | Method to manufacture ionized calcium product out of shell |
| KR101001998B1 (en) | 2010-04-13 | 2010-12-16 | 주식회사 케이씨티 | Plastic packaging materials comprising charcoal and its preparation method |
| KR20150011724A (en) * | 2013-07-23 | 2015-02-02 | 임덕빈 | The method for manufacturing the master batch |
| KR20150107003A (en) * | 2014-03-12 | 2015-09-23 | 조선대학교산학협력단 | Biomaterials using abalone shell and method thereof |
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2015
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100378875B1 (en) * | 1998-12-09 | 2004-08-16 | 석미수 | Synthetic resin product containing shellfish powder and its manufacturing method |
| KR100818220B1 (en) * | 2007-11-19 | 2008-04-02 | (주)드림라임 | Method to manufacture ionized calcium product out of shell |
| KR101001998B1 (en) | 2010-04-13 | 2010-12-16 | 주식회사 케이씨티 | Plastic packaging materials comprising charcoal and its preparation method |
| KR20150011724A (en) * | 2013-07-23 | 2015-02-02 | 임덕빈 | The method for manufacturing the master batch |
| KR20150107003A (en) * | 2014-03-12 | 2015-09-23 | 조선대학교산학협력단 | Biomaterials using abalone shell and method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| KR102481200B1 (en) * | 2022-08-22 | 2022-12-26 | 유재윤 | Food packaging material with excellent food freshness and antibacterial properties and method for manufacturing the same |
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