WO2024128396A1 - Feuille biodégradable résistante à l'humidité et récipient alimentaire l'utilisant - Google Patents

Feuille biodégradable résistante à l'humidité et récipient alimentaire l'utilisant Download PDF

Info

Publication number
WO2024128396A1
WO2024128396A1 PCT/KR2022/021723 KR2022021723W WO2024128396A1 WO 2024128396 A1 WO2024128396 A1 WO 2024128396A1 KR 2022021723 W KR2022021723 W KR 2022021723W WO 2024128396 A1 WO2024128396 A1 WO 2024128396A1
Authority
WO
WIPO (PCT)
Prior art keywords
biodegradable sheet
moisture
resistant
fiber
clause
Prior art date
Application number
PCT/KR2022/021723
Other languages
English (en)
Korean (ko)
Inventor
차완영
Original Assignee
주식회사 마린이노베이션
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 주식회사 마린이노베이션 filed Critical 주식회사 마린이노베이션
Publication of WO2024128396A1 publication Critical patent/WO2024128396A1/fr

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D65/00—Wrappers or flexible covers; Packaging materials of special type or form
    • B65D65/38—Packaging materials of special type or form
    • B65D65/46—Applications of disintegrable, dissolvable or edible materials
    • B65D65/466—Bio- or photodegradable packaging materials
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D1/00—Containers having bodies formed in one piece, e.g. by casting metallic material, by moulding plastics, by blowing vitreous material, by throwing ceramic material, by moulding pulped fibrous material, by deep-drawing operations performed on sheet material
    • B65D1/22—Boxes or like containers with side walls of substantial depth for enclosing contents
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D65/00—Wrappers or flexible covers; Packaging materials of special type or form
    • B65D65/38—Packaging materials of special type or form
    • B65D65/40—Applications of laminates for particular packaging purposes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D65/00—Wrappers or flexible covers; Packaging materials of special type or form
    • B65D65/38—Packaging materials of special type or form
    • B65D65/46—Applications of disintegrable, dissolvable or edible materials
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H11/00—Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only
    • D21H11/12—Pulp from non-woody plants or crops, e.g. cotton, flax, straw, bagasse
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H15/00—Pulp or paper, comprising fibres or web-forming material characterised by features other than their chemical constitution
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
    • D21H17/02—Material of vegetable origin
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21J—FIBREBOARD; MANUFACTURE OF ARTICLES FROM CELLULOSIC FIBROUS SUSPENSIONS OR FROM PAPIER-MACHE
    • D21J3/00—Manufacture of articles by pressing wet fibre pulp, or papier-mâché, between moulds
    • D—TEXTILES; PAPER
    • D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B2401/00—Physical properties
    • D10B2401/12—Physical properties biodegradable

Definitions

  • the present invention relates to moisture-resistant biodegradable sheets and food containers using the same. More specifically, it relates to a biodegradable sheet using fiber obtained from seaweed and a food container using the same.
  • the present applicant has applied for a mold manufacturing method using seaweed pulp in Korea Patent Publication No. 10-2141932 (July 31, 2020). It was confirmed that the mold manufactured according to the preceding literature could be manufactured into the shape of a food container, etc. using seaweed pulp, but the strength of the manufactured molded product did not reach a level that could replace the plastic container currently used.
  • Patent Document 1 Korean Patent Publication No. 10-2141932 (July 31, 2020)
  • One object of the present invention is to provide a biodegradable sheet that is flexible and provides mechanical strength sufficient to replace conventional plastic containers, and a food container using the same.
  • the aim is to provide a biodegradable sheet with excellent biodegradability and a food container using the same.
  • the aim is to provide a biodegradable sheet with excellent water and oil resistance and a food container using the same.
  • the present applicant has developed an eco-friendly product that is flexible and can provide mechanical strength sufficient to replace conventional plastic containers, has excellent biodegradability, and has excellent water and oil resistance.
  • the present invention was completed by discovering that it was possible to provide a biodegradable sheet of material and a food container using the same.
  • One aspect of the present invention is a web form in which first fibers obtained from seaweed and second fibers obtained from wood and plants are networked together, and the average length (L1) of the first fibers and the second fibers are The ratio L1/L2 of the average length (L2) is 0.1 to 0.5, and is a biodegradable sheet formed by uniformly inserting the first fiber into the upper part and pores of the web made of the second fiber, wherein the biodegradable sheet is based on dry weight.
  • a biodegradable sheet having a moisture content of 10% by weight or less and a bulk density of 0.4 to 1.2 g/cm 3 ; and
  • It provides a moisture-resistant biodegradable sheet including; a moisture-resistant coating layer formed by coating or impregnating one or both sides of the biodegradable sheet.
  • Another aspect of the present invention seeks to provide a molded body, more specifically a food container, including the moisture-resistant biodegradable sheet according to the above aspect.
  • the biodegradable sheet according to one aspect of the present invention is capable of biodegradation within 60 days in an aerobic biodegradability test according to ISO 14855-1:2012.
  • the biodegradable sheet according to one aspect of the present invention has a tensile strength of 5 KN/cm2 or more according to ISO 1924-2, an elongation of 1.5% or more, a tear strength of 4000 mN or more according to ISO 1974, and ISO 2758. It has excellent mechanical properties with a bursting strength of over 350 kPa, so it can replace conventional plastic containers.
  • the biodegradable sheet according to one aspect of the present invention has a Cobb value of 30 g/m2 or less according to TAPPI T441, a kit grade of 1 or more according to TAPPI 559, and excellent water and oil resistance, so it can be used as a food container. It can be used appropriately.
  • Figure 1 is a photograph taken of a cross section of a biodegradable sheet according to Example 1 of the present invention.
  • Figure 2 is a photograph of the first surface of the biodegradable sheet according to Example 1 of the present invention.
  • Figure 3 is a photograph of the second surface of the biodegradable sheet according to Example 1 of the present invention.
  • a layer or member when a layer or member is said to be located “on” another layer or member, this means not only when a layer or member is in contact with another layer or member, but also when a layer or member is located “on” another layer or member. This also includes cases where another layer or another member exists in between.
  • One aspect of the present invention is a web form in which first fibers obtained from seaweed and second fibers obtained from wood and plants are networked together, and the average length (L1) of the first fibers and the second fibers are The ratio L1/L2 of the average length (L2) is 0.1 to 0.5, is formed by uniformly inserting the first fiber into the upper part and pores of the web made of the second fiber, and has a moisture content of 10% by weight or less based on dry weight. , a biodegradable sheet having a bulk density of 0.4 to 1.2 g/cm 3 ; and
  • It provides a moisture-resistant biodegradable sheet including; a moisture-resistant coating layer formed by coating or impregnating one or both sides of the biodegradable sheet.
  • the biodegradable sheet may be biodegraded within 60 days in an aerobic biodegradability test according to ISO 14855-1:2012, but is not limited thereto.
  • the biodegradable sheet may have different surface roughnesses on both surfaces.
  • the biodegradable sheet may have a density gradient in which the web density increases from the first surface to the second surface when the surface with high surface roughness is referred to as the first surface. That is, as shown in Figures 1 to 3, the first and second surfaces have different surface roughnesses, and the web density increases from the first surface to the second surface, that is, the web is formed more densely. It may be possible.
  • L1 may be 1 to 5 mm, and L2 may be 2 to 10 mm, but are not limited thereto.
  • the biodegradable sheet may have a basis weight of 400 to 800 g/m2, but is not limited thereto.
  • the biodegradable sheet may contain 50% by weight or less of the first fiber, more specifically 1 to 50% by weight, 10 to 50% by weight, or 10 to 30% by weight, It is not limited to this.
  • the biodegradable sheet may be dried after molding a pulp liquid mixed with the first fiber, second fiber, and water.
  • the sheet may be molded so that the moisture content of the sheet is maintained at 30 to 50% by weight when forming the mold, and the moisture content after drying is maintained at 5% by weight or less, and is flexible and at the same time mechanical in the above range. It is preferred because it can produce a biodegradable sheet with excellent physical strength, but is not limited thereto.
  • the remaining moisture in the sheet after drying may form hydroxy groups to induce hydrogen bonding, thereby providing a biodegradable sheet with superior mechanical strength.
  • the water content in the pulp liquid may be 80 to 98% by weight
  • the thickness of the biodegradable sheet can be adjusted by adjusting the water content, so it is not limited thereto, but within the above range, the desired mechanical It may be preferred because it can provide biodegradable sheets with excellent strength.
  • the first fiber is formed from seaweed pulp obtained by pulverizing dried seaweed, mixed with water, and then dissociated
  • the second fiber may be formed from wood pulp obtained by dissociating wood and plants.
  • the seaweed may be any one selected from Gracilaria Lichenoides and Sargassum Horneri, or a mixture thereof, but is not limited thereto, but when using the seaweed, other seaweed is used. It is possible to provide a biodegradable sheet with superior mechanical properties compared to the conventional sheet.
  • the biodegradable sheet has a tensile strength of 5 KN/cm2 or more, an elongation of 1.5% or more according to ISO 1924-2, a tear strength of 4000 mN or more according to ISO 1974, and a bursting strength according to ISO 2758. It may be above 350 kPa.
  • the moisture-resistant coating layer may have a Cobb value of 30 g/m2 or less according to TAPPI T441 and a kit grade of 1 or more according to TAPPI 559.
  • the moisture-resistant coating layer may be formed by applying or impregnating a chitosan solution containing 1% by weight or less of chitosan with a molecular weight of 50,000 to 400,000 Da.
  • the moisture-resistant coating layer may have an application thickness of 1 mm or less.
  • the molded body may be a food container, and can be specifically used as a container for storing and transporting food, such as a food tray, plate, egg carton, etc.
  • the biodegradable sheet may have a thickness of about 0.1 to 2 mm, 0.5 to 5 mm, or 1 to 1.5 mm, but is not limited thereto since the thickness can be adjusted as needed.
  • the basis weight may be 400 to 800 g/m2 or 400 to 600 g/m2, but is not limited thereto.
  • the biodegradable sheet contains 20 to 50% by weight of first fibers obtained from seaweed and 50 to 80% by weight of second fibers obtained from wood and plants, more specifically, 30 to 50% by weight of first fibers and a second fiber obtained from wood and plants. 2 It may contain 50 to 70% by weight of fiber. Within the above range, it is preferable because it is capable of exhibiting excellent biodegradability and mechanical strength, but is not limited thereto.
  • the biodegradable sheet is in the form of a web in which first fibers obtained from seaweed and second fibers obtained from wood and plants are networked together, and the biodegradable sheet is formed on the upper part and pores of the web composed of the second fibers. It refers to a biodegradable sheet formed by uniformly inserting the first fiber.
  • the web form means networked like a net, and may mean a non-woven fabric in which short fibers are combined.
  • the ratio L1/L2 between the average length (L1) of the first fiber and the average length (L2) of the second fiber is preferably 0.1 to 0.5, and may specifically be 0.2 to 0.5.
  • the above range is preferred because it is possible to manufacture a biodegradable sheet that has the desired mechanical strength and flexibility at the same time, but the biodegradable sheet can also be manufactured in a range outside this range.
  • First fibers are uniformly filled in the upper part and inside the pores of the two-fiber web, providing a sheet with higher bulk density, and thus providing a biodegradable sheet that can maintain mechanical strength even when bent or transported. You can.
  • the first fiber and the second fiber may be bound in an entangled state.
  • the average length (L1) of the first fiber may be 1 to 5 mm
  • the average length (L2) of the second fiber may be 2 to 10 mm.
  • the average length (L1) of the first fiber may be 1 to 4 mm, 1 to 3 mm, or 1 to 2 mm
  • the average length (L2) of the second fiber may be 2 to 9 mm, or 2 to 8 mm.
  • the biodegradable sheet according to one aspect of the present invention may have different surface roughness on both surfaces, and the surface where more first fibers are inserted has a higher surface roughness as shown in Figure 3. It may form a low, dense and smooth surface, and a surface with relatively few first fibers inserted may have a high surface roughness as shown in FIG. 2. In this way, the surface roughness of both surfaces is different from each other by immersing the mold of the shape to be molded in the pulp liquid mixed with the first fiber, second fiber, and water, then taking it out, and placing the pulp on the surface of the mold in the same shape as the mold. It may be formed by drying moisture in a liquid state, but is not limited thereto.
  • it may be manufactured by a wet method, which is the same method as the papermaking process, which is a papermaking process. Accordingly, it has a structure in which a plurality of second fibers arranged parallel to the surface of the mold are stacked, the empty space is filled with the first fiber, and there is a space between the first fiber and the second fiber or between the first fiber and the second fiber. It may be that they are entangled with each other.
  • the first surface when the surface with high surface roughness is referred to as the first surface, there may be a density gradient in which the web density increases from the first surface to the second surface.
  • the density may increase from the surface to the center, or the density may increase from the center to both surfaces, but this is not limited as it can be adjusted depending on the manufacturing method.
  • the web density increases from the first surface to the second surface, resulting in a more dense web structure, thereby providing flexibility due to the relatively less dense first surface with high surface roughness.
  • Mechanical strength can be provided by the first surface, which is relatively denser and has a lower surface roughness. Therefore, from the perspective of providing flexibility and mechanical strength that can be used as a food container, the web density of the first and second surfaces is different, and more specifically, the web density increases from the first surface to the second surface. It is desirable to have a gradient.
  • the biodegradable sheet has a moisture content of 10% by weight or less, 5% by weight or less, and 3% by weight or less, specifically 0.1 to 10% by weight, 1 to 5% by weight, and 1 to 3% by weight, based on dry weight.
  • the above range is preferred because it prevents gelation of fibers obtained from seaweed and provides a biodegradable sheet with excellent mechanical properties, but ranges outside this range are not excluded.
  • the biodegradable sheet may have a bulk density of 0.4 to 1.2 g/cm 3 , 0.4 to 1.0 g/cm 3 , and 0.4 to 0.6 g/cm 3 , and may be flexible and machine-resistant within this range. It may be preferred because it can provide ideal physical properties, and does not exclude ranges beyond this.
  • the first fiber obtained from seaweed and the second fiber obtained from wood and plants can be manufactured by methods known in the art, and the manufacturing method is not limited.
  • the first fiber obtained from seaweed is formed from seaweed pulp obtained by pulverizing dried seaweed, mixed with water, and then dissociated, and the second fiber is formed from pulp obtained by dissociating wood and plants. It could be.
  • the first fiber obtained from the seaweed may be manufactured into seaweed fiber through processes such as washing, drying, softening, pulping, and drying the seaweed.
  • the first fiber obtained from the seaweed is, for example, washed and dried, and immersed in an extraction solvent that can dissolve viscous components such as agar gel and alginate for a certain period of time, making the seaweed viscous with the extraction solvent. After dissolving and removing the components, the remaining slurry is physically pulverized to soften and pulp to dissociate, and if necessary, bleached using a bleaching agent such as Cl 2 O or H 2 O 2 to extract only the seaweed fibers. .
  • an extraction solvent that can dissolve viscous components such as agar gel and alginate for a certain period of time, making the seaweed viscous with the extraction solvent.
  • the remaining slurry is physically pulverized to soften and pulp to dissociate, and if necessary, bleached using a bleaching agent such as Cl 2 O or H 2 O 2 to extract only the seaweed fibers.
  • seaweed is immersed in an acidic solution, washed with water and dehydrated, then the dehydrated seaweed is immersed in an extraction solvent such as water for a certain period of time to extract viscous components such as agar gel and alginate, then the residue is bleached and collected.
  • seaweed fiber can be obtained.
  • the seaweed fiber is made of fructose and cellulose as main ingredients and does not melt by heat.
  • the seaweed is dried to a moisture content of 10% by weight or less, then pulverized to a size of 3 mm or less, more specifically 1 to 2 mm, and the pulverized product is mixed with an aqueous Na 2 SO 3 solution and stirred to undergo a softening process. .
  • the seaweed is converted into white fibrous material. It is washed with water, and a pulp liquid mixed with softened seaweed, pulp obtained from wood and plants, and purified water is supplied to a pulper.
  • the raw material mixture was pumped into a dump chest and mixed using a stirrer.
  • the pH may be maintained above 5 in the dump box, and the temperature may be maintained at 50 to 70°C.
  • the mixed material is transferred to the pulp washing process, where it is mixed again with water and transferred to a molding machine with moving conveyor trays.
  • the conveyor tray may pass through the internal channel of the drying oven and be dried so that the moisture content of the final sheet is 10% by weight or less, 5% by weight or less, and more preferably 1 to 3% by weight.
  • the seaweed pulp and seaweed fibers prepared in this way can be easily gelled.
  • Gelation of seaweed pulp may be when the fibers of the seaweed pulp absorb moisture and change into a gel shape.
  • seaweed pulp gels When seaweed pulp gels, its viscosity and elasticity rapidly increase and it cannot be condensed and thus cannot be formed into a mold. That is, seaweed pulp cannot be formed into molds in the same way as mold forming methods using cotton pulp or wood pulp. Accordingly, it is desirable to include processes for controlling the moisture content of the seaweed pulp and/or fiber during the drying process after molding in the molding machine. That is, it is preferable to adjust the moisture content of the pulp liquid to 30 to 50% by weight to prevent gelation.
  • a mold can be manufactured by filling the mold with pulp liquid and applying pressure. Before molding the pulp liquid during the molding process, the moisture content of the pulp liquid can be adjusted to 30 to 50% by weight. Next, it is transferred to a drying device and dried.
  • the drying device may be a conveyor belt that receives the molded product from the mold forming machine and a drying device (blowing device and heating device).
  • the molded product may be dried in a drying process to become a finished product.
  • the moisture content of the final sheet is dried to 10% by weight or less, 5% by weight or less, or even better, 1 to 3% by weight, so that the remaining moisture after drying forms hydroxy groups and induces hydrogen bonding, thereby improving the mechanical strength of the sheet. Strength can be further improved.
  • the drying process is not limited, but may be drying at 150 to 250°C for 30 to 60 minutes.
  • the seaweed includes agar, agar, Laci, spinosum, stone agar, seaweed, seaweed, grass agar, agar radish, bird's foot, agar, agar, silk grass, shortbread, graphite, chinuari, sea lettuce, It may be any one or a mixture thereof selected from the group consisting of chlorella, long-sleeved radish, black radish, green radish, seaweed, kelp, seaweed, hijiki, gamtae, bear skin, Dae-bang, Gracilaria Lichenoides, and Sargassumhorneri. and is not limited thereto.
  • the tensile strength is higher compared to using other types of seaweed such as seaweed and kelp. It is preferred, but is not limited thereto, because it can provide a biodegradable sheet with excellent mechanical strength that is improved by more than 40%. Even better, it may be used by mixing Gracilaria Lichenoides and Sargassumhorneri, and the mixing ratio is not limited, but may be mixed at a weight ratio of 0.1 to 99.9:99.9 to 0.1, and the mixing ratio is Not limited.
  • the plant refers to raw materials from which vegetable fibers can be obtained excluding wood and seaweed, specifically, for example, rice straw, corn stalks, reeds, bamboo, flax, cotton, hemp and sugarcane. It may be one or a mixture of two or more selected from the like, but is not limited thereto.
  • the biodegradable sheet according to one aspect of the present invention may be biodegraded within 60 days in an aerobic biodegradability test according to ISO 14855-1:2012.
  • the biodegradable sheet has a tensile strength of 5 KN/cm2 or more, an elongation of 1.5% or more according to ISO 1924-2, a tear strength of 4000 mN or more according to ISO 1974, and a bursting strength of 350 kPa according to ISO 2758. It may be more than that. More specifically, the tensile strength may be 5 to 10 KN/cm2, the elongation may be 1.5 to 5%, the tear strength may be 4000 to 5000 mN, and the bursting strength may be 350 to 700 kPa.
  • the moisture-resistant biodegradable sheet of the present invention includes a moisture-resistant coating layer formed by coating or impregnating one or both sides of the biodegradable sheet.
  • the moisture-resistant coating layer may be used without limitation as long as it is commonly used in the relevant field, but in the present invention, it is biodegradable in nature and may be formed by applying or impregnating a chitosan solution from an environmentally friendly viewpoint.
  • the chitosan solution is applied or impregnated with a solution in which chitosan having a molecular weight of 50,000 to 400,000 Da, 50,000 to 195,000 Da, 200,000 to 400,000 Da, 200,000 to 300,000 Da, or 305,000 to 400,000 Da is dispersed or dissolved. may have been formed .
  • the application method is not limited, and the application includes roller, brush, spray application, etc., and the impregnation may be by dipping the biodegradable sheet in a chitosan solution.
  • the chitosan solution may be chitosan powder dissolved in an acid solution such as acetic acid, and the content of chitosan in the chitosan solution may be 15% by weight or less, more specifically 0.01 to 15% by weight, and more specifically, It may be 0.05 to 10% by weight or 0.1 to 1% by weight.
  • the content of chitosan is not limited as it can be adjusted differently depending on the application method, but in the case of spray application, it can be used at a concentration of 0.1 to 1% by weight.
  • the chitosan solution prepared in this way is applied by dipping or spraying, the overall mechanical strength of the biodegradable sheet increases, and as the number of coatings increases, the degree of water absorption decreases, and the surface becomes damaged due to repeated coating and drying processes. It was confirmed that it became smooth. Specifically, it was confirmed that when the chitosan solution was immersed or sprayed to form a moisture-resistant coating layer, the tensile strength increased compared to the uncoated layer.
  • the tensile strength of the biodegradable sheet is T1 and the tensile strength of the moisture-resistant biodegradable sheet with a moisture-resistant coating layer formed by coating or impregnating one or both sides of the biodegradable sheet is T2, the following formula 1
  • the rate of change in tensile strength may be 20% or more, more specifically 20 to 30%.
  • the tensile strength but also the tear strength and bursting strength are improved.
  • the tearing strength and bursting strength are each 20% or more compared to before forming the coating layer. , specifically, can be improved by 20 to 30%.
  • the biodegradable sheet with the moisture-resistant coating layer was immersed in water at 80°C for 10 minutes and then taken out, it was confirmed that only a portion of the sheet had penetrated moisture and exhibited water resistance.
  • the biodegradable sheet with the moisture-resistant coating layer was immersed in water at 80°C for 10 minutes and the content of chitosan leached into the water was measured. As a result, it was confirmed that chitosan was not leached and the coating layer was maintained. This is expected to prevent leaching because chitosan is strongly bound to the biodegradable sheet, and the moisture content after drying of the biodegradable sheet is expected to affect the interaction between chitosan and the biodegradable sheet.
  • biodegradable sheet and moisture-resistant biodegradable sheet according to the present invention can be suitably used in food containers or food packaging.
  • the moisture-resistant coating layer formed using the chitosan solution may have a Cobb value of 30 g/m2 or less according to TAPPI T441, specifically 25 to 30 g/m2, and may have resistance to moisture. This is evaluated by measuring the amount of water that has seeped into the coated surface after it has been in contact with water for a certain period of time. At this time, the amount of water is 80 to 120 ml, most preferably 100 ml, and the contact time is 20 to 40 minutes, most preferably 30 minutes. Measurements are made using hot or cold water depending on the end use. Preferably, water resistance to hot water has priority over water resistance to cold water, and the measured value (Cobb value) is the amount of water absorbed by the paper through the surface, so the lower the value, the better the water resistance.
  • kit grade according to TAPPI 559 may be 1 or higher. This measures the staining time by dropping a drop of a mixture of castor oil, toluene, and heptane on the surface of the sheet with an eye dropper.
  • the surface may be oil-resistant because it does not stain within 15 seconds.
  • the moisture-resistant coating layer may be adjusted in thickness by adjusting the number of applications, and may have an application thickness of 1 mm or less, 0.5 mm or less, or 0.1 mm or less, and provides water resistance and oil resistance in the above range without increasing production costs. Therefore, it may be preferable, but is not limited thereto.
  • it may include a process of drying at 150 to 250 ° C. for 30 to 60 minutes after application or immersion, and when drying after coating the chitosan solution as described above, chitosan powder is deposited on the surface and inside of the biodegradable sheet. can be evenly distributed.
  • the tensile strength and elongation of the biodegradable sheets were measured according to ISO 1924-2. Measurement conditions were performed at 23.0 ⁇ 1°C and 50 ⁇ 2% RH.
  • the tear strength of the biodegradable sheet was measured according to ISO 1974. Measurement conditions were performed at 23.0 ⁇ 1°C and 50 ⁇ 2% RH.
  • the bursting strength of the biodegradable sheet was measured according to ISO 2758. Measurement conditions were performed at 23.0 ⁇ 1°C and 50 ⁇ 2% RH.
  • the bulk density of the biodegradable sheet was measured according to KS M ISO 534 and calculated using the following equation.
  • the moisture content based on dry weight of the biodegradable sheet was measured using a moisture content meter (METTLER TOLEDO, HC103 product).
  • Aerobic biodegradability tests were performed according to ISO 14855-1:2012.
  • Water resistance was measured by Cobb value according to TAPPI T441, and oil resistance was measured by kit grade according to TAPPI 559.
  • a chitosan solution was prepared by dissolving 0.5% by weight of chitosan powder with a molecular weight of 100,000 Da in acetic acid.
  • the prepared pulp liquid was supplied to a pulper, pumped into a dump chest, and mixed using a stirrer.
  • the pH was maintained at 6 in the dump box, and the temperature was maintained at 60°C. It was transferred to a pulp washing process, then mixed with water and transferred to a molding machine with moving conveyor trays. At this time, the moisture content of the pulp liquid injected into the mold was adjusted to maintain 50% by weight.
  • the conveyor tray was passed through the internal channel of the drying oven and dried at 200°C until the moisture content of the sheet injected into the mold reached 5% by weight. The dried sheet was separated from the mold.
  • the chitosan solution prepared in Preparation Example 1 was repeatedly spray-coated on both sides of the biodegradable sheet at a flow rate of 10 ml/min, and dried at 200°C for 40 minutes to form a moisture-resistant coating layer. .
  • a biodegradable sheet was manufactured in the same manner as in Example 1, except that the contents of the first fiber and the second fiber were adjusted as shown in Table 1 below.
  • the chitosan solution prepared in Preparation Example 1 was repeatedly spray-coated on both sides of the biodegradable sheet at a flow rate of 10 ml/min, and dried at 200°C for 40 minutes to form a moisture-resistant coating layer.
  • a biodegradable sheet was manufactured in the same manner as in Example 1, except that the lengths of the first and second fibers were adjusted as shown in Table 1 below. That is, a biodegradable sheet was manufactured in the same manner as in Example 1, except that 4% by weight of the first fiber with an average length of 2 mm and 6% by weight of the second fiber with an average length of 10 mm were used.
  • the chitosan solution prepared in Preparation Example 1 was repeatedly spray-coated on both sides of the biodegradable sheet at a flow rate of 10 ml/min, and dried at 200°C for 40 minutes to form a moisture-resistant coating layer.
  • a biodegradable sheet was manufactured in the same manner as in Example 1, except that the lengths of the first and second fibers were adjusted as shown in Table 1 below. That is, the same biodegradable sheet and moisture-resistant biodegradable sheet as in Example 1, except that 7% by weight of the first fiber with an average length of 1 mm and 3% by weight of the second fiber with an average length of 15 mm were used. A sheet was manufactured.
  • a biodegradable sheet was manufactured in the same manner as in Example 1, except that the lengths of the first and second fibers were adjusted as shown in Table 1 below. That is, the same biodegradable sheet and moisture-resistant biodegradable sheet as in Example 1, except that 1% by weight of the first fiber with an average length of 7 mm and 9% by weight of the second fiber with an average length of 10 mm were used. A sheet was manufactured.
  • a sheet was manufactured in the same manner as in Example 1, except that the sheet was manufactured using only secondary fibers with an average length of 4 mm obtained from wood instead of using seaweed fibers.
  • Example 1 the same chitosan solution as in Example 1 was coated on the prepared sheet in the same manner.
  • the Cobb value was 40 g/m2
  • the water resistance slightly increased compared to before coating the chitosan solution, but it was confirmed that the water resistance was lower than that of Example 1. It is expected that some water resistance is developed through the effect of chitosan physically filling the microspaces present in the paper, and as Example 1 contains seaweed fibers, water resistance is further improved by the interaction between seaweed fibers and chitosan. It is expected that it will happen.
  • Example 1 Example 2 Example 3 Comparative Example 1 Comparative example 2 1st fiber: 2nd fiber (weight ratio) 3:7 5:5 4:6 7:3 1:9 L1(mm) 2 2 2 2 One 7 L2(mm) 4 4 10 15 10 L1/L2 0.5 0.5 0.2 0.07 0.6 bulk density (g/ cm3 ) 0.6 0.5 0.4 1.3 0.2 Moisture content based on dry weight (weight%) 5 5 5 11 2 Aerobic biodegradability test Pass Pass Pass did not pass did not pass basis weight (g/ m2 ) 600 500 400 1300 200 Elongation (%) 2.4 1.6 2.2 1.1 1.3 tensile strength (KN/ cm2 ) Before coating 7.35 6.53 7.20 4.8 3.5 After coating 8.967 8.0319 8.712 5.04 3.71 Tear strength (mN) Before coating 4990 4480 4650 3860 3950 After coating 6137 5465 5719 4091 4147 Bursting strength (kPa) Before coating 537 560 542 345 336 After coating 6
  • before coating refers to the physical properties of the biodegradable sheet before forming the moisture-resistant coating layer
  • after coating refers to the physical properties of the moisture-resistant biodegradable sheet after the moisture-resistant coating layer is formed.
  • the biodegradable sheet according to the present invention has excellent mechanical properties and was confirmed to be biodegradable within 60 days in an aerobic biodegradability test.
  • the manufactured biodegradable sheet was confirmed to have different surface roughness on both surfaces and a density gradient, as shown in Figures 1 to 3. Specifically, it was confirmed that the web density increases from the first surface with low surface roughness to the second surface. Accordingly, it was confirmed that a sheet with flexibility and excellent mechanical strength was manufactured.
  • the average Cobb value was 25 g/m 2 , confirming that it had resistance to moisture.
  • the kit grade was 1 or higher, which means that the surface was not stained within 15 seconds when exposed to a drop of pure castor oil, indicating oil resistance.
  • the chitosan composition After coating the chitosan composition to form a moisture-resistant coating layer, it was immersed in water at 80°C for 10 minutes, taken out, and the water was analyzed. The amount of chitosan leached was very minimal, indicating that the chitosan was firmly bound to the biodegradable sheet. it means. This is expected to be because the interaction between chitosan and seaweed fibers is very large due to electrostatic bonding.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Ceramic Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Biodiversity & Conservation Biology (AREA)
  • Laminated Bodies (AREA)
  • Paper (AREA)

Abstract

La présente invention concerne une feuille biodégradable et un récipient alimentaire l'utilisant. Plus particulièrement, la présente invention concerne une feuille biodégradable utilisant des fibres obtenues à partir d'algues et un récipient alimentaire l'utilisant. Un aspect de la présente invention concerne une feuille biodégradable sous la forme d'une bande dans laquelle des premières fibres obtenues à partir d'algues et des secondes fibres obtenues à partir de bois et d'une plante sont mises en réseau ensemble, un rapport L1/L2 d'une longueur moyenne (L1) des premières fibres à une longueur moyenne (L2) des secondes fibres étant de 0,1 à 0,5, et les premières fibres étant insérées uniformément dans la partie supérieure et les pores de la bande comprenant les secondes fibres, la feuille biodégradable ayant une teneur en humidité de 10% en poids ou moins par rapport au poids sec et une masse volumique apparente de 5,0 à 7,0 g/cm3. La présente invention concerne également une feuille biodégradable résistante à l'humidité qui, en comprenant une couche de revêtement résistante à l'humidité formée par revêtement ou imprégnation sur un ou les deux côtés de la feuille biodégradable, présente une excellente résistance à l'eau et une excellente résistance à l'huile.
PCT/KR2022/021723 2022-12-13 2022-12-30 Feuille biodégradable résistante à l'humidité et récipient alimentaire l'utilisant WO2024128396A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR10-2022-0173854 2022-12-13
KR1020220173854A KR20240088281A (ko) 2022-12-13 2022-12-13 수분저항성 생분해성 시트 및 이를 이용한 식품용기

Publications (1)

Publication Number Publication Date
WO2024128396A1 true WO2024128396A1 (fr) 2024-06-20

Family

ID=91486007

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/KR2022/021723 WO2024128396A1 (fr) 2022-12-13 2022-12-30 Feuille biodégradable résistante à l'humidité et récipient alimentaire l'utilisant

Country Status (2)

Country Link
KR (1) KR20240088281A (fr)
WO (1) WO2024128396A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20020048353A (ko) * 2002-05-24 2002-06-22 김휘주 목질분 고함량의 생분해성 블록·그래프트 혼성중합매트릭스 컴파운드와 컴파운드 제조방법
KR20100040306A (ko) * 2007-07-03 2010-04-19 유니챰 가부시키가이샤 흡수성 물품의 개별 포장체, 포장용 시트 및 포장용 시트의 제조 방법
KR20200046620A (ko) * 2018-10-25 2020-05-07 (주) 세림비앤지 생분해성 라미네이팅이 다층 코팅된 커피 및 음료용 생분해성 종이컵
KR20210098448A (ko) * 2018-12-07 2021-08-10 필립모리스 프로덕츠 에스.에이. 생분해성 여과 물질을 갖는 에어로졸 발생 물품
KR20220066451A (ko) * 2020-11-16 2022-05-24 주식회사 마린이노베이션 해조류를 포함하는 펄프몰드 및 그 제조방법

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102141932B1 (ko) 2018-11-16 2020-08-06 주식회사 마린이노베이션 해조류 펄프를 이용한 몰드 제조 방법

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20020048353A (ko) * 2002-05-24 2002-06-22 김휘주 목질분 고함량의 생분해성 블록·그래프트 혼성중합매트릭스 컴파운드와 컴파운드 제조방법
KR20100040306A (ko) * 2007-07-03 2010-04-19 유니챰 가부시키가이샤 흡수성 물품의 개별 포장체, 포장용 시트 및 포장용 시트의 제조 방법
KR20200046620A (ko) * 2018-10-25 2020-05-07 (주) 세림비앤지 생분해성 라미네이팅이 다층 코팅된 커피 및 음료용 생분해성 종이컵
KR20210098448A (ko) * 2018-12-07 2021-08-10 필립모리스 프로덕츠 에스.에이. 생분해성 여과 물질을 갖는 에어로졸 발생 물품
KR20220066451A (ko) * 2020-11-16 2022-05-24 주식회사 마린이노베이션 해조류를 포함하는 펄프몰드 및 그 제조방법

Also Published As

Publication number Publication date
KR20240088281A (ko) 2024-06-20

Similar Documents

Publication Publication Date Title
FI68393B (fi) Foerfarande foer framstaellning av en icke braennbar och asbestfri skivprodukt
WO2015012626A1 (fr) Composition biodégradable utilisant de la cellulose et procédé pour sa préparation, et agent imperméable à l'eau et produit moulé utilisant la composition
CN112962356B (zh) 一种高抗压强度、防水纸浆模塑材料及其制备方法
CN1210569A (zh) 包含纤维素酯和烷基多糖苷的组合物和纸
WO2011078442A1 (fr) Non-tissé médical et son procédé de fabrication
WO2016108508A1 (fr) Matériau lyocell pour filtre de cigarette, et son procédé de préparation
CA2439444A1 (fr) Procede perfectionne d'utilisation d'additifs chimiques insolubles dans l'eau avec de la pate a papier et produits fabriques au moyen de ce procede
CN104204344A (zh) 玻璃板衬纸用木材纸浆以及玻璃板用衬纸
CN109640776A (zh) 水解性片材和该水解性片材的制造方法
BR0207743A (pt) Método para aplicar aditivos quìmicos à pasta durante o processamento de pasta e produtos feitos pelo referido método
WO2020101449A1 (fr) Procédé de fabrication de moule à l'aide de pulpe d'algue marine
WO2024128396A1 (fr) Feuille biodégradable résistante à l'humidité et récipient alimentaire l'utilisant
WO2021133114A1 (fr) Non-tissé humide et article comprenant ledit non-tissé humide
US4147833A (en) Glass fiber coating composition
CN110199062A (zh) 水解性片材和该水解性片材的制造方法
CN105887566B (zh) 一种用于纸质文物保护的处理液、制备方法及应用
Silva et al. Scaffolds based on hydroxypropyl starch: Processing, morphology, characterization, and biological behavior
FR2458623A1 (fr) Feutre caoutchoute pour plancher, sans amiante
WO2024128395A1 (fr) Feuille biodégradable et récipient alimentaire l'utilisant
DE1012168B (de) Verfahren zum Wasserabweisendmachen von Faserstoffen
EP0092210A2 (fr) Feuille non-tissée en fibres formées uniquement de polyamides aromatiques et procédés pour la produire
CN115491930A (zh) 一种可降解纸浆模塑产品及其制备方法和应用
US4074988A (en) Glass fiber coating method
EP4342957A1 (fr) Agent résistant à l'huile
JPS6039525B2 (ja) 繊維強化板製品の製造方法

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 22968656

Country of ref document: EP

Kind code of ref document: A1