CN113172970A - Preparation method of packaging material, packaging material and packaging bag - Google Patents

Preparation method of packaging material, packaging material and packaging bag Download PDF

Info

Publication number
CN113172970A
CN113172970A CN202110454375.5A CN202110454375A CN113172970A CN 113172970 A CN113172970 A CN 113172970A CN 202110454375 A CN202110454375 A CN 202110454375A CN 113172970 A CN113172970 A CN 113172970A
Authority
CN
China
Prior art keywords
tea
polyvinyl alcohol
packaging material
polylactic acid
essential oil
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.)
Granted
Application number
CN202110454375.5A
Other languages
Chinese (zh)
Other versions
CN113172970B (en
Inventor
韩延超
郜海燕
陈杭君
吴伟杰
房祥军
穆宏磊
刘瑞玲
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Zhejiang Academy of Agricultural Sciences
Original Assignee
Zhejiang Academy of Agricultural Sciences
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Zhejiang Academy of Agricultural Sciences filed Critical Zhejiang Academy of Agricultural Sciences
Priority to CN202110454375.5A priority Critical patent/CN113172970B/en
Publication of CN113172970A publication Critical patent/CN113172970A/en
Application granted granted Critical
Publication of CN113172970B publication Critical patent/CN113172970B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
    • C08J5/18—Manufacture of films or sheets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
    • B32B27/306—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising vinyl acetate or vinyl alcohol (co)polymers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/36—Layered products comprising a layer of synthetic resin comprising polyesters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B33/00—Layered products characterised by particular properties or particular surface features, e.g. particular surface coatings; Layered products designed for particular purposes not covered by another single class
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/50—Properties of the layers or laminate having particular mechanical properties
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/716—Degradable
    • B32B2307/7163—Biodegradable
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/724—Permeability to gases, adsorption
    • B32B2307/7242—Non-permeable
    • B32B2307/7244—Oxygen barrier
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/724—Permeability to gases, adsorption
    • B32B2307/7242—Non-permeable
    • B32B2307/7246—Water vapor barrier
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2553/00—Packaging equipment or accessories not otherwise provided for
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2329/00—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an alcohol, ether, aldehydo, ketonic, acetal, or ketal radical; Hydrolysed polymers of esters of unsaturated alcohols with saturated carboxylic acids; Derivatives of such polymer
    • C08J2329/02—Homopolymers or copolymers of unsaturated alcohols
    • C08J2329/04—Polyvinyl alcohol; Partially hydrolysed homopolymers or copolymers of esters of unsaturated alcohols with saturated carboxylic acids
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2367/00—Characterised by the use of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Derivatives of such polymers
    • C08J2367/04—Polyesters derived from hydroxy carboxylic acids, e.g. lactones
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2491/00—Characterised by the use of oils, fats or waxes; Derivatives thereof
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K13/00—Use of mixtures of ingredients not covered by one single of the preceding main groups, each of these compounds being essential
    • C08K13/02—Organic and inorganic ingredients
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K2201/00—Specific properties of additives
    • C08K2201/014—Additives containing two or more different additives of the same subgroup in C08K
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/34—Silicon-containing compounds
    • C08K3/346—Clay
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K5/00—Use of organic ingredients
    • C08K5/04—Oxygen-containing compounds
    • C08K5/05—Alcohols; Metal alcoholates
    • C08K5/053—Polyhydroxylic alcohols
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K5/00—Use of organic ingredients
    • C08K5/04—Oxygen-containing compounds
    • C08K5/13—Phenols; Phenolates

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Wrappers (AREA)
  • Packging For Living Organisms, Food Or Medicinal Products That Are Sensitive To Environmental Conditiond (AREA)

Abstract

The invention provides a preparation method of a packaging material, the packaging material and a packaging bag. The packaging material comprises an aluminum-plated layer, a tea polyphenol-polyvinyl alcohol film and a tea essential oil-polylactic acid film which are sequentially stacked. The packaging material disclosed by the invention has long-term effective barrier property on oxygen and moisture, is high in biodegradability and good in mechanical property, and can be used for effectively inhibiting the oxidation of a to-be-packaged object, inhibiting the breeding of microorganisms of the to-be-packaged object, prolonging the quality guarantee period of the to-be-packaged object and improving the economic benefit when being used for packaging the to-be-packaged object.

Description

Preparation method of packaging material, packaging material and packaging bag
Technical Field
The invention relates to a preparation method of a packaging material, the packaging material and a packaging bag, and belongs to the field of food packaging.
Background
At present, the industry of dried food (tea, edible fungus dried products, dried nuts and the like) at home and abroad develops rapidly, and the storage mode of the dried food also draws more and more attention.
Generally, the dried food is easy to absorb moisture automatically and generate oxidation, which can cause the quality of the dried food to be deteriorated, even cause the dried food to lose commodity value and edible value, and cause economic loss. In order to avoid the self-moisture absorption and oxidation of the dried food, the dried food needs to be stored in a dry, low-oxygen environment. However, the packaging materials currently used for packaging dried foods generally have a problem of poor barrier properties against oxygen and moisture, and thus long-term storage of dried foods is difficult to achieve.
In addition, the current packaging materials for packaging dried foods have the problem of difficult degradation.
Disclosure of Invention
The present invention provides a packaging material which has long-term effective barrier properties against oxygen and moisture and is easily degradable.
The invention provides a preparation method of the packaging material, which not only can prepare the packaging material which has long-term effective barrier property on oxygen and moisture and is easy to degrade, but also has simple preparation method and easy operation.
The invention provides a packaging bag which not only has long-term effective barrier property to oxygen and moisture, but also is easy to degrade, and can well store dried food.
The invention provides a packaging material, which comprises an aluminum-plated layer, a tea polyphenol-polyvinyl alcohol film and a tea essential oil-polylactic acid film which are sequentially stacked.
The packaging material as described above, wherein the tea polyphenol-polyvinyl alcohol film is prepared according to a method comprising the following processes:
mixing tea polyphenol, polyvinyl alcohol, glycerol, alkynediol, water and montmorillonite to obtain tea polyphenol and polyvinyl alcohol composite liquid;
the tea polyphenol and polyvinyl alcohol composite liquid is subjected to defoaming treatment, casting treatment and drying treatment in sequence to obtain the tea polyphenol-polyvinyl alcohol film;
wherein the tea polyphenol and polyvinyl alcohol composite liquid comprises the following components in percentage by mass: 3-4% of tea polyphenol, 4.5-5.5% of polyvinyl alcohol, 0.45-0.55% of glycerol, 0.045-0.055% of alkynediol, 0.24-0.26% of montmorillonite and 89-92% of water.
The packaging material as described above, wherein the tea essential oil-polylactic acid film is prepared according to a method comprising the following steps:
mixing polylactic acid, dichloromethane and tea essential oil to obtain a mixed solution;
the mixed solution is subjected to defoaming treatment, casting treatment and drying treatment in sequence to obtain the tea essential oil-polylactic acid film;
wherein the mass-volume ratio of the polylactic acid to the dichloromethane in the mixed solution is (0.05-0.09) g: 1 mL;
the tea essential oil accounts for 2-3% by mass.
The packaging material as described above, wherein the thickness of the tea polyphenol-polyvinyl alcohol film is 20 to 30 μm.
The packaging material as described above, wherein the thickness of the tea essential oil-polylactic acid film is 20 to 30 μm.
The packaging material as described above, wherein the thickness of the aluminum plating layer is 2500-.
The packaging material as described above, wherein an adhesive layer is provided between the tea essential oil-polylactic acid film and the tea polyphenol-polyvinyl alcohol film;
the bonding layer comprises a polyurethane adhesive.
The invention also provides a preparation method of the packaging material, wherein the aluminum-plated layer, the tea polyphenol-polyvinyl alcohol film and the tea essential oil-polylactic acid film are sequentially stacked to obtain the packaging material.
The preparation method comprises the following steps:
pasting the tea essential oil-polylactic acid film on any functional surface of the tea polyphenol-polyvinyl alcohol film, and rolling;
and arranging an aluminum plating layer on the functional surface of the tea polyphenol-polyvinyl alcohol film, which is far away from the tea essential oil-polylactic acid film, so as to obtain the packaging material.
The invention also provides a packaging bag, which comprises the packaging material;
the packaging bag comprises an inner wall, and the inner wall is the tea essential oil-polylactic acid film of the packaging material.
According to the packaging material, the tea polyphenol-polyvinyl alcohol film and the tea essential oil-polylactic acid film are sequentially stacked on the aluminum plating layer, wherein the tea polyphenol-polyvinyl alcohol film and the tea essential oil-polylactic acid film are matched, so that oxygen and moisture can be blocked, the oxygen and moisture are effectively prevented from contacting with a to-be-packaged object for a long time, and the service life of the to-be-packaged object is prolonged; the tea polyphenol-polyvinyl alcohol film and the tea essential oil-polylactic acid film belong to degradable materials, can be subjected to biodegradation and completely converted into water and carbon dioxide, have no toxic or side effect, and are green and environment-friendly, so that the packaging material disclosed by the invention also has good biodegradability; in addition, the aluminum-plated layer, the tea polyphenol-polyvinyl alcohol film and the tea essential oil-polylactic acid film have good mechanical properties, so that the packaging material disclosed by the invention also has good mechanical properties. In conclusion, the packaging material can fully block oxygen and moisture, can be used for storing the to-be-packaged objects for a long time in an environment of isolating oxygen and moisture, has good biodegradability and mechanical properties, can effectively inhibit the oxidation of the to-be-packaged objects, inhibit the breeding of microorganisms of the to-be-packaged objects, prolong the quality guarantee period of the to-be-packaged objects and improve economic benefits when used for packaging the to-be-packaged objects.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the related art, the drawings used in the description of the embodiments of the present invention or the related art are briefly introduced below. It is obvious that the drawings in the following description are only some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.
FIG. 1 is a graph showing the change in the content of tea polyphenols in tea leaves stored in packages prepared from the packaging materials of example 2 of the present invention and comparative example;
FIG. 2 is a graph showing the change in the vitamin C content of tea leaves stored in the packaging bags made of the packaging materials of example 2 of the present invention and comparative example.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention provides a packaging material, which comprises an aluminum-plated layer, a tea polyphenol-polyvinyl alcohol film and a tea essential oil-polylactic acid film which are sequentially stacked.
It is understood that the packaging material of the present invention is an aluminum-plated layer, a tea polyphenol-polyvinyl alcohol film and a tea essential oil-polylactic acid film in this order from top to bottom (or from bottom to top).
The aluminum-plated layer can be formed by plating aluminum on the surface of the tea polyphenol-polyvinyl alcohol film, and can realize the isolation of most of oxygen, moisture and light.
The tea polyphenol-polyvinyl alcohol film is a tea polyphenol modified polyvinyl alcohol film, and researches show that the tea polyphenol-polyvinyl alcohol film not only can realize effective physical isolation on oxygen and prevent the oxygen from contacting with a to-be-packaged object (the to-be-packaged object can be a substance needing sealing, drying and storing, such as dried food) but also has certain oxidation resistance and bacterial inhibition, so that the storage life of the to-be-packaged object can be further prolonged. In addition, the tea polyphenol in the tea polyphenol-polyvinyl alcohol film can also react with oxygen, so that the probability of contact between the packaged material and the oxygen is further reduced.
The tea essential oil-polylactic acid film is a composite film of tea essential oil and polylactic acid. On the one hand, the tea essential oil-polylactic acid film can realize effective separation of moisture, and on the other hand, the tea essential oil-polylactic acid film also has certain oxidation resistance and bacterial inhibition, so that more effective protection can be provided for a to-be-packaged object.
According to the invention, the aluminum-plated layer, the tea polyphenol-polyvinyl alcohol film and the tea essential oil-polylactic acid film are sequentially stacked, so that the packaging material with good barrier property to moisture and oxygen can be obtained, the obtained packaging material can be used for effectively storing the object to be packaged for a long time, and the quality guarantee period of the object to be packaged is prolonged.
It is worth mentioning that the tea polyphenol-polyvinyl alcohol film and the tea essential oil-polylactic acid film have good biodegradability, can be completely degraded into water and carbon dioxide, and have no toxic or side effect, so that the packaging material of the invention also has good biodegradability and is green and environment-friendly. In addition, the aluminum-plated layer, the tea polyphenol-polyvinyl alcohol film and the tea essential oil-polylactic acid film have good mechanical properties, so that the packaging material also has good mechanical properties.
In some embodiments of the present invention, the tea polyphenol-polyvinyl alcohol film is prepared according to a method comprising:
mixing tea polyphenol, polyvinyl alcohol, glycerol, alkynediol, water and montmorillonite to obtain tea polyphenol and polyvinyl alcohol composite liquid;
carrying out defoaming treatment, casting treatment and drying treatment on the tea polyphenol and polyvinyl alcohol composite liquid in sequence to obtain a tea polyphenol-polyvinyl alcohol film;
wherein, the tea polyphenol polyvinyl alcohol composite liquid comprises the following components in percentage by mass: 3-4% of tea polyphenol, 4.5-5.5% of polyvinyl alcohol, 0.45-0.55% of glycerol, 0.045-0.055% of alkynediol, 0.24-0.26% of montmorillonite and 89-92% of water.
It can be understood that the tea polyphenol and polyvinyl alcohol composite liquid can be obtained by mixing tea polyphenol, polyvinyl alcohol, glycerol, alkynediol, water and montmorillonite; then standing the tea polyphenol and polyvinyl alcohol composite liquid for 30min for defoaming treatment to obtain defoamed tea polyphenol and polyvinyl alcohol composite liquid; then carrying out tape casting treatment on the defoamed tea polyphenol and polyvinyl alcohol composite liquid to obtain an intermediate tea polyphenol-polyvinyl alcohol film; and finally, drying the intermediate tea polyphenol-polyvinyl alcohol film for 16-20h at the drying temperature of 30-40 ℃ to obtain the tea polyphenol-polyvinyl alcohol film.
In the invention, in order to further realize the water barrier property of the tea polyphenol-polyvinyl alcohol film, the tea polyphenol-polyvinyl alcohol film can be prepared by using montmorillonite, tea polyphenol and polyvinyl alcohol, and because the montmorillonite has good water absorption and can absorb water, the tea polyphenol-polyvinyl alcohol film prepared by using montmorillonite, tea polyphenol and polyvinyl alcohol can well avoid the contact of water vapor and liquid with a to-be-packaged object.
In the invention, in order to balance the barrier property of the tea polyphenol-polyvinyl alcohol film on oxygen and moisture and prolong the shelf life of a packaged material, the mass percentage of montmorillonite in the tea polyphenol-polyvinyl alcohol composite liquid can be controlled to be 0.24-0.26%, the mass percentage of tea polyphenol in the tea polyphenol-polyvinyl alcohol composite liquid can be controlled to be 3-4%, and the mass percentage of polyvinyl alcohol in the tea polyphenol-polyvinyl alcohol composite liquid can be controlled to be 4.5-5.5%.
According to the invention, the tea polyphenol-polyvinyl alcohol film capable of effectively blocking oxygen and moisture for a long time can be obtained by matching the tea polyphenol, polyvinyl alcohol, glycerol, alkynediol, water and montmorillonite, so that the long-term effective blocking property of the packaging material for oxygen and moisture can be further improved, and the quality guarantee period of the packaged material can be prolonged.
In some embodiments of the present invention, the tea essential oil-polylactic acid film is prepared according to a method comprising the following steps:
mixing polylactic acid, dichloromethane and tea essential oil to obtain a mixed solution;
the mixed solution is subjected to defoaming treatment, casting treatment and drying treatment in sequence to obtain the tea essential oil-polylactic acid film;
wherein, in the mixed solution, the mass volume ratio of the polylactic acid to the dichloromethane is (0.05-0.09) g: 1mL, and the mass percentage of the tea essential oil is 2-3%.
It can be understood that the invention mixes polylactic acid, methylene dichloride and tea essential oil to obtain mixed liquid; standing the mixed solution for 30min for defoaming to obtain a defoamed mixed solution; carrying out tape casting treatment on the defoamed mixed solution to obtain an intermediate tea essential oil-polylactic acid film; drying the middle polylactic acid film for 16-20h at 30-40 deg.C to obtain tea essential oil-polylactic acid film.
In the invention, when the mass percentage of the tea essential oil is too high, the barrier property of the tea essential oil-polylactic acid film to moisture can be reduced, and the flavor of the object to be packaged can be influenced by too much tea essential oil; when the mass percentage of the tea essential oil is too low, it is difficult to fully exert the oxidation resistance and the antibacterial property of the tea essential oil, and it is difficult to obtain a tea essential oil-polylactic acid film which can effectively store the material to be packaged for a long time. The invention limits the mass percentage of the tea essential oil to 2-3%, not only does not influence the water barrier property of the tea essential oil-polylactic acid film and the flavor of the object to be packaged, but also can improve the antibacterial property and the oxidation resistance of the tea essential oil-polylactic acid film, and further can effectively store the object to be packaged for a long time.
In some embodiments of the invention, the tea polyphenol-polyvinyl alcohol film has a thickness of 20 to 30 μm.
In the present invention, when the thickness of the tea polyphenol-polyvinyl alcohol film is too thick, not only the production cost is increased, but also the workability of the tea polyphenol-polyvinyl alcohol film is poor; when the thickness of the tea polyphenol-polyvinyl alcohol film is too thin, the barrier property of the tea polyphenol-polyvinyl alcohol film to oxygen is weakened, and the too thin tea polyphenol-polyvinyl alcohol film is easy to damage in the long-term use process and has short service life. The invention limits the thickness of the tea polyphenol-polyvinyl alcohol film to be 20-30 mu m, and in the range, the tea polyphenol-polyvinyl alcohol film which has low production cost and good processability, can effectively isolate oxygen for a long time and can store the object to be packaged for a long time can be obtained.
In some embodiments of the present invention, the tea essential oil-polylactic acid film has a thickness of 20 to 30 μm.
In the present invention, when the thickness of the tea essential oil-polylactic acid film is too thick, not only the production cost is increased, but also the workability of the tea essential oil-polylactic acid film is poor; when the thickness of the tea essential oil-polylactic acid film is too thin, the barrier property of the tea essential oil-polylactic acid film against moisture is weakened, and the too thin tea essential oil-polylactic acid film is easily damaged in a long-term use process and has a short service life. The invention limits the thickness of the tea essential oil-polylactic acid alcohol film to be 20-30 mu m, and in the range, the tea essential oil-polylactic acid film which has low production cost and good processability, has effective barrier to moisture and can effectively preserve the object to be packaged for a long time can be obtained.
In some embodiments of the invention, the thickness of the aluminum layer is 2500-.
In the present invention, when the thickness of the aluminum plating layer is too thick, the production cost may be increased, and the processability of the excessively thick aluminum plating layer is poor, which may reduce the biodegradability of the packaging material; when the thickness of the aluminum plating layer is too thin, the barrier property of the aluminum plating layer to moisture and oxygen is reduced, and the too thin aluminum plating layer is easy to damage in the long-term use process and is difficult to effectively store the object to be packed for a long time. The thickness of the aluminum coating is limited to 2500-3500 angstroms, and the prepared packaging material has the advantages of low production cost, good processability, effective obstruction to oxygen and moisture, long-term effective storage of the object to be packaged, good biodegradability and environmental protection.
In some embodiments of the present invention, a tie layer is disposed between the tea essential oil-polylactic acid film and the tea polyphenol-polyvinyl alcohol film;
the adhesive layer comprises a polyurethane adhesive.
It can be understood that, in the invention, the tea essential oil-polylactic acid film and the tea polyphenol-polyvinyl alcohol film are adhered through the adhesive layer, the tea essential oil-polylactic acid film and the tea polyphenol-polyvinyl alcohol film can be well adhered through the adhesive layer, and when the packaging material is used for a long time, the tea essential oil-polylactic acid film and the tea polyphenol-polyvinyl alcohol film are not easy to separate, so that the service life of the packaging material can be prolonged.
In a second aspect of the present invention, a method for preparing the above packaging material is provided, in which an aluminum-plated layer, a tea polyphenol-polyvinyl alcohol film, and a tea essential oil-polylactic acid film are sequentially stacked to obtain the packaging material.
Further, the preparation method comprises the following steps:
pasting a tea essential oil-polylactic acid film on any functional surface of the tea polyphenol-polyvinyl alcohol film, and rolling;
and arranging an aluminum plating layer on the functional surface of the tea polyphenol-polyvinyl alcohol film far away from the tea essential oil-polylactic acid film to obtain the packaging material.
It is understood that the functional surfaces of the tea polyphenol-polyvinyl alcohol film in the present invention refer to two surfaces of the tea polyphenol-polyvinyl alcohol film which have the largest area and are oppositely disposed.
In the invention, the tea leaf essential oil-polylactic acid film is adhered to any functional surface of the tea polyphenol-polyvinyl alcohol film and is rolled, so that the tea polyphenol-polyvinyl alcohol film and the tea leaf essential oil-polylactic acid film can be well adhered together through rolling, and the service life of the packaging material can be prolonged. The tea polyphenol-polyvinyl alcohol film and the tea essential oil-polylactic acid film can be adhered together by using a polyurethane adhesive.
And then arranging an aluminum plating layer on the functional surface of the tea polyphenol-polyvinyl alcohol film, which is far away from the tea essential oil-polylactic acid film, and obtaining the packaging material at the same time. The aluminum coating can better improve the barrier property and the mechanical property of the packaging material to oxygen and moisture.
The invention does not limit the arrangement sequence of the tea essential oil-polylactic acid film and the aluminum plating layer, and in some embodiments, the aluminum plating layer can be arranged on any functional surface of the tea polyphenol-polyvinyl alcohol film; and then pasting a tea essential oil-polylactic acid film on the surface of the tea polyphenol-polyvinyl alcohol film far away from the aluminum-plated layer, and rolling to obtain the packaging material.
The preparation method of the invention not only can prepare the packaging material which has long-term effective barrier property to oxygen and moisture, is easy to degrade and has long service life, but also has simple preparation method and easy operation.
A third aspect of the present invention provides a packaging bag comprising the packaging material described above;
the packaging bag comprises an inner wall, and the inner wall is a tea essential oil-polylactic acid film made of packaging materials.
It is understood that, in the present invention, the object to be packed is placed in the packing bag to come into contact with the inner wall. The packaging bag disclosed by the invention not only can effectively block oxygen and moisture, but also has good degradability and mechanical properties, and can effectively preserve the to-be-packaged objects for a long time. Meanwhile, the inner wall of the packaging material is the tea essential oil-polylactic acid film which has good oxidation resistance and bacterial inhibition, and when the packaging material is in contact with the tea essential oil-polylactic acid film, the oxidation resistance and bacterial inhibition of the packaging material can be improved. The packaging bag is used for packaging the to-be-packaged objects, so that the oxidation of the to-be-packaged objects can be effectively inhibited, the breeding of microorganisms of the to-be-packaged objects is inhibited, the quality guarantee period of the to-be-packaged objects is prolonged, and the economic benefit is improved.
The technical means of the present invention will be further described below with reference to specific examples.
Example 1
The packaging material of this example was prepared by the following steps:
1) preparing a tea polyphenol-polyvinyl alcohol film:
mixing tea polyphenol, polyvinyl alcohol, glycerol, alkynediol, water and montmorillonite to obtain tea polyphenol and polyvinyl alcohol composite liquid;
standing the tea polyphenol and polyvinyl alcohol composite liquid for 30min for defoaming to obtain a defoamed tea polyphenol and polyvinyl alcohol composite liquid; carrying out tape casting treatment on the defoamed tea polyphenol and polyvinyl alcohol composite liquid to obtain an intermediate tea polyphenol-polyvinyl alcohol film; drying the intermediate tea polyphenol-polyvinyl alcohol film at 35 ℃ for 18h to obtain a tea polyphenol-polyvinyl alcohol film;
wherein, the tea polyphenol polyvinyl alcohol composite liquid comprises the following components in percentage by mass: 4% of tea polyphenol, 5.5% of polyvinyl alcohol, 0.5% of glycerol, 0.05% of alkynediol, 0.25% of montmorillonite and 89.7% of water; the thickness of the tea polyphenol-polyvinyl alcohol film is 25 μm.
2) Preparation of tea essential oil-polylactic acid film
Mixing polylactic acid, dichloromethane and tea essential oil to obtain a mixed solution;
standing the mixed solution for 30min for defoaming to obtain a defoamed mixed solution; carrying out tape casting treatment on the defoamed mixed solution to obtain an intermediate tea essential oil-polylactic acid film; drying the intermediate tea essential oil-polylactic acid film in a fume hood to form a film, wherein the drying temperature is 35 ℃, and the drying time is 18 hours, so as to obtain the tea essential oil-polylactic acid film;
wherein the mass of the polylactic acid is 4g, the volume of the dichloromethane is 60mL, and the mass percentage content of the tea essential oil is 2% based on the mass of the polylactic acid film; the thickness of the tea essential oil-polylactic acid film is 30 mu m.
3) Preparation of packaging Material
Under the vacuum condition, aluminum plating is carried out on any functional surface of the tea polyphenol-polyvinyl alcohol film to form an aluminum plating layer, and the thickness of the aluminum plating layer is 3000 angstroms; and then sticking the tea essential oil-polylactic acid film on the surface of the tea polyphenol-polyvinyl alcohol film, which is far away from the aluminum-plated layer, by using a polyurethane adhesive, and rolling to obtain the packaging material, wherein the thickness of the packaging material is 0.07 mm.
Example 2
The packaging material of this example was prepared essentially the same as in example 1, except that:
step 1), the tea polyphenol and polyvinyl alcohol composite liquid comprises the following components in percentage by mass: 3% of tea polyphenol, 5.5% of polyvinyl alcohol, 0.5% of glycerol, 0.05% of alkynediol, 0.25% of montmorillonite and 90.7% of water; the thickness of the tea polyphenol-polyvinyl alcohol film is 30 μm.
In the step 2), the mass of the polylactic acid is 4.5g, the volume of the dichloromethane is 60mL, and the mass percentage content of the tea essential oil is 3% based on the mass of the polylactic acid film; the thickness of the tea essential oil-polylactic acid film is 35 mu m.
In the step 3), the thickness of the aluminum coating is 3500 angstroms, and the thickness of the packaging material is 0.08 mm.
Example 3
The packaging material of this example was prepared essentially the same as in example 1, except that:
step 1), the tea polyphenol and polyvinyl alcohol composite liquid comprises the following components in percentage by mass: 3% of tea polyphenol, 5% of polyvinyl alcohol, 0.5% of glycerol, 0.05% of alkynediol, 0.25% of montmorillonite and 91, 2% of water; the thickness of the tea polyphenol-polyvinyl alcohol film is 35 μm.
In the step 2), the mass of the polylactic acid is 4.5g, the volume of the dichloromethane is 65mL, and the mass percentage content of the tea essential oil is 3% based on the mass of the polylactic acid film; the thickness of the tea essential oil-polylactic acid film is 30 mu m.
In the step 3), the thickness of the aluminum coating is 2500 angstroms, and the thickness of the packaging material is 0.08 mm.
Comparative example 1
The packaging material of the comparative example was a PET aluminized film with a thickness of 0.08 mm.
Test examples
1. The packaging materials of each example and comparative example were subjected to a water vapor transmission rate test and an oxygen transmission rate test, respectively, and the test results are shown in table 1.
1) Water vapor transmission test
The determination method of the water vapor transmission capacity of the film is based on the GB/T1037-1988 test method of the water vapor transmission capacity of plastic films and sheets-cup method2Drying in oven at 200 deg.C for 2 hr, cooling, and adding anhydrous CaCl2Added to the moisture permeable cup at a distance of 3mm from the film sample. And (3) after the thickness of the film sample is measured, tightly fixing the film sample on the moisture permeable cup mouth by using sealing wax, recording the water vapor permeable area S of the sample, and weighing the mass. Putting the weighed moisture permeable cup into a constant temperature and humidity box with the temperature of 38 ℃ and the relative humidity of 90%, taking out after 24h, balancing for 30min in the constant temperature and humidity box with the temperature of 23 ℃ and the relative humidity of 90%, weighing the mass of the moisture permeable cup, taking the mass difference value delta m between the front and the back, and calculating the water vapor transmission capacity of the film according to the following formula:
Figure BDA0003039978300000101
2) oxygen transmission capacity test
The oxygen permeability of the film is measured by a BTY B1 air permeability tester according to GB/T1038-2000 pressure differential test method for gas permeability of plastic films and sheets. And sealing the uniform and flat film sample on a sample cavity, and balancing in a constant-temperature constant-humidity chamber with normal pressure and 50% RH at 23 deg.C for 24h before measurement, wherein the measurement temperature is set to 23 deg.C, and the relative humidity is 50%.
TABLE 1
Figure BDA0003039978300000102
Figure BDA0003039978300000111
As can be seen from table 1, the packaging materials prepared in the examples of the present invention have lower water vapor transmission and oxygen transmission than the aluminum foil packaging materials, indicating that the packaging materials of the examples of the present invention have long-term effective barrier properties against both oxygen and moisture.
2. Heat-sealing the packaging materials of example 2 and comparative example by a heat sealer to obtain a packaging bag having an inner wall;
wherein, the inner wall in the example 2 is a tea essential oil-polylactic acid film, and the inner wall of the comparative example is a PET film.
The tea leaves were put in the packaging bags made of the packaging materials of example 2 and comparative example for 3 months, 6 months, 9 months and 12 months, respectively, and the tea leaves were taken out and the contents of tea polyphenols and vitamin C in the tea leaves were measured by the following methods, respectively:
1) tea Polyphenol content test
Refer to the method specified in GB/T8313-2008 "method for detecting the content of tea polyphenol and catechin in tea". The absorbance was measured at 765nm wavelength with reagent blank solution as control and repeated three times.
2) Vitamin C (Vc) test
And measuring the Vc content by adopting a spectrophotometry method. The absorbance was measured at a wavelength of 534nm with reagent blank solution as a control and repeated three times. The calculation formula of Vc content is as follows:
Figure BDA0003039978300000112
in the formula: v is the total volume of the sample extracting solution, mL;
m1-mass of Vc, μ g, from the standard curve;
vs-volume of extract at assay, mL;
m-mass of sample, g.
FIG. 1 is a graph showing the change in the content of tea polyphenols in tea leaves stored in packages prepared from the packaging materials of example 2 of the present invention and comparative example;
FIG. 2 is a graph showing the change in the vitamin C content of tea leaves stored in the packaging bags made of the packaging materials of example 2 of the present invention and comparative example.
As shown in fig. 1 and fig. 2, the content of tea polyphenol and vitamin C in the tea stored in the packaging bag made of the packaging material of example 2 of the present invention is slower than the content of tea polyphenol and vitamin C in the tea stored in the packaging bag made of the packaging material of the comparative example, which indicates that the packaging material of the present invention can effectively store the object to be packaged for a long time and can prolong the shelf life of the object to be packaged.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims (10)

1. A packaging material is characterized by comprising an aluminum-plated layer, a tea polyphenol-polyvinyl alcohol film and a tea essential oil-polylactic acid film which are sequentially stacked.
2. The packaging material of claim 1, wherein the tea polyphenol-polyvinyl alcohol film is prepared according to a method comprising:
mixing tea polyphenol, polyvinyl alcohol, glycerol, alkynediol, water and montmorillonite to obtain tea polyphenol and polyvinyl alcohol composite liquid;
the tea polyphenol and polyvinyl alcohol composite liquid is subjected to defoaming treatment, casting treatment and drying treatment in sequence to obtain the tea polyphenol-polyvinyl alcohol film;
wherein the tea polyphenol and polyvinyl alcohol composite liquid comprises the following components in percentage by mass: 3-4% of tea polyphenol, 4.5-5.5% of polyvinyl alcohol, 0.45-0.55% of glycerol, 0.045-0.055% of alkynediol, 0.24-0.26% of montmorillonite and 89-92% of water.
3. The packaging material according to claim 1, wherein the tea essential oil-polylactic acid film is prepared according to a method comprising the following processes:
mixing polylactic acid, dichloromethane and tea essential oil to obtain a mixed solution;
the mixed solution is subjected to defoaming treatment, casting treatment and drying treatment in sequence to obtain the tea essential oil-polylactic acid film;
wherein the mass-volume ratio of the polylactic acid to the dichloromethane in the mixed solution is (0.05-0.09) g: 1 mL;
the tea essential oil accounts for 2-3% by mass.
4. The packaging material according to claim 1 or 2, wherein the thickness of the tea polyphenol-polyvinyl alcohol film is 20 to 30 μm.
5. The packaging material according to claim 1 or 3, wherein the thickness of the tea essential oil-polylactic acid film is 20 to 30 μm.
6. The packaging material as claimed in any one of claims 1 to 5, wherein the thickness of the aluminized layer is 2500-3500 angstroms.
7. The packaging material of claim 1, wherein an adhesive layer is disposed between the tea essential oil-polylactic acid film and the tea polyphenol-polyvinyl alcohol film;
the bonding layer comprises a polyurethane adhesive.
8. A method for producing the packaging material according to any one of claims 1 to 7, wherein the packaging material is obtained by laminating an aluminum-plated layer, a tea polyphenol-polyvinyl alcohol film, and a tea essential oil-polylactic acid film in this order.
9. The method of claim 8, comprising the steps of:
pasting the tea essential oil-polylactic acid film on any functional surface of the tea polyphenol-polyvinyl alcohol film, and rolling;
and arranging an aluminum plating layer on the functional surface of the tea polyphenol-polyvinyl alcohol film, which is far away from the tea essential oil-polylactic acid film, so as to obtain the packaging material.
10. A packaging bag comprising the packaging material according to any one of claims 1 to 7;
the packaging bag comprises an inner wall, and the inner wall is the tea essential oil-polylactic acid film of the packaging material.
CN202110454375.5A 2021-04-26 2021-04-26 Preparation method of packaging material, packaging material and packaging bag Active CN113172970B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202110454375.5A CN113172970B (en) 2021-04-26 2021-04-26 Preparation method of packaging material, packaging material and packaging bag

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202110454375.5A CN113172970B (en) 2021-04-26 2021-04-26 Preparation method of packaging material, packaging material and packaging bag

Publications (2)

Publication Number Publication Date
CN113172970A true CN113172970A (en) 2021-07-27
CN113172970B CN113172970B (en) 2022-06-10

Family

ID=76926311

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202110454375.5A Active CN113172970B (en) 2021-04-26 2021-04-26 Preparation method of packaging material, packaging material and packaging bag

Country Status (1)

Country Link
CN (1) CN113172970B (en)

Citations (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998036907A1 (en) * 1997-02-19 1998-08-27 Nippon Foil Mfg. Co., Ltd. Packaging material and package container
JP2004204366A (en) * 2002-12-24 2004-07-22 Toppan Printing Co Ltd Moisture-proof paper and packaging paper, packaging bag or paper container using the same
CN101130607A (en) * 2007-08-07 2008-02-27 东华大学 Polyvinyl alcohol polymer compound film and method for preparing the same
CN101311074A (en) * 2008-06-17 2008-11-26 南京农业大学 Green tea fresh-keeping nano packaging wrapper and use thereof
WO2011099424A2 (en) * 2010-02-09 2011-08-18 Murata Moriyasu Food packaging sheet
CN102181075A (en) * 2011-05-06 2011-09-14 浙江理工大学 Natural anti-oxidation degradable packing material
CN102604292A (en) * 2012-02-22 2012-07-25 湖南新五丰股份有限公司 Active packaging film for chilled meat and preparation method of the active packaging film
CN103238655A (en) * 2013-03-19 2013-08-14 南通玉兔集团有限公司 Antibacterial preservation technology for conventional pickled bacon products
CN106146989A (en) * 2016-08-18 2016-11-23 安徽颍美彩印包装有限公司 A kind of natural anti-corrosive antibacterial packaging material for food and preparation method thereof
CN106497085A (en) * 2016-11-03 2017-03-15 金福英 A kind of edible package film and preparation method thereof
CN106519631A (en) * 2016-11-28 2017-03-22 天津科技大学 Antibacterial degradable food packaging material and preparation thereof
CN107234857A (en) * 2017-07-26 2017-10-10 广东宝佳利彩印实业有限公司 A kind of tea packaging film and preparation method thereof, packaging of tea and packing method
CN108864670A (en) * 2018-07-31 2018-11-23 合肥华盖生物科技有限公司 A kind of preparation method of degradable food package film
CN111890769A (en) * 2020-08-09 2020-11-06 刘军林 Antibacterial composite polylactic acid preservative film material and preparation method thereof

Patent Citations (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998036907A1 (en) * 1997-02-19 1998-08-27 Nippon Foil Mfg. Co., Ltd. Packaging material and package container
JP2004204366A (en) * 2002-12-24 2004-07-22 Toppan Printing Co Ltd Moisture-proof paper and packaging paper, packaging bag or paper container using the same
CN101130607A (en) * 2007-08-07 2008-02-27 东华大学 Polyvinyl alcohol polymer compound film and method for preparing the same
CN101311074A (en) * 2008-06-17 2008-11-26 南京农业大学 Green tea fresh-keeping nano packaging wrapper and use thereof
WO2011099424A2 (en) * 2010-02-09 2011-08-18 Murata Moriyasu Food packaging sheet
CN102181075A (en) * 2011-05-06 2011-09-14 浙江理工大学 Natural anti-oxidation degradable packing material
CN102604292A (en) * 2012-02-22 2012-07-25 湖南新五丰股份有限公司 Active packaging film for chilled meat and preparation method of the active packaging film
CN103238655A (en) * 2013-03-19 2013-08-14 南通玉兔集团有限公司 Antibacterial preservation technology for conventional pickled bacon products
CN106146989A (en) * 2016-08-18 2016-11-23 安徽颍美彩印包装有限公司 A kind of natural anti-corrosive antibacterial packaging material for food and preparation method thereof
CN106497085A (en) * 2016-11-03 2017-03-15 金福英 A kind of edible package film and preparation method thereof
CN106519631A (en) * 2016-11-28 2017-03-22 天津科技大学 Antibacterial degradable food packaging material and preparation thereof
CN107234857A (en) * 2017-07-26 2017-10-10 广东宝佳利彩印实业有限公司 A kind of tea packaging film and preparation method thereof, packaging of tea and packing method
CN108864670A (en) * 2018-07-31 2018-11-23 合肥华盖生物科技有限公司 A kind of preparation method of degradable food package film
CN111890769A (en) * 2020-08-09 2020-11-06 刘军林 Antibacterial composite polylactic acid preservative film material and preparation method thereof

Also Published As

Publication number Publication date
CN113172970B (en) 2022-06-10

Similar Documents

Publication Publication Date Title
Ashley Permeability and plastics packaging
Lea et al. 304. The gas-packing and storage of milk powder
Sangsuwan et al. Development of active chitosan films incorporating potassium sorbate or vanillin to extend the shelf life of butter cake
CN105660833A (en) Preservation method of big cherry by lactic acid bacteria preservative and modified atmosphere packaging
Trobetas et al. Light-induced changes in grated Graviera hard cheese packaged under modified atmospheres
CN109749539B (en) High-barrier functional PVA coating liquid and preparation method and application thereof
CN105593356A (en) Method for reducing ethanol loss while creating desirable organoleptic properties during wooden barrel aging of alcoholic beverages
Holm et al. Quality changes in semi-hard cheese packaged in a poly (lactic acid) material
CN113172970B (en) Preparation method of packaging material, packaging material and packaging bag
US20070048410A1 (en) Plastic bag comprising ready-to-cook fresh vegetables and a pouch comprising a flavoring composition
Zhou et al. Comparative quality changes of fresh-cut melon in bio-based and petroleum-based plastic containers during storage
Clarke Packing of roast and instant coffee
Kumar et al. Effect of modified atmosphere packaging on keeping quality of jaggery
Sangsuwan et al. Effects of vanillin and plasticizer on properties of chitosan‐methyl cellulose based film
JP6091519B2 (en) Materials and packages for yeast storage
BRPI0814727B1 (en) packaging for liquid products
Min et al. Thermoformed container wall thickness effects on orange juice quality
WO1991013556A1 (en) A packaging material which removes oxygen from a package and a method of producing the material
CA2023537A1 (en) Package for perishable fruits and vegetables
Rodrigues et al. Evaluation of the effectiveness of non-irradiated and chlorine-free packaging for fresh beef preservation
Nicoli et al. 11 Packaging and the Shelf Life of Coffee
Velázquez-Contreras et al. Effect of PLA Active Packaging Containing Monoterpene-Cyclodextrin Complexes on Berries Preservation. Polymers 2021, 13, 1399
KR100529803B1 (en) Film for package of Sweet Persimmon with Improved Cold Storageing ability
KR101677594B1 (en) A packaging method of kimchi product for preventing volumeincrement
CN105076509A (en) Preparation and preservation process of semi-dry green tea

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