Preparation method for eco-friendly functional corrugated-cardboard adhesive composition for food preservation, corrugated cardboard manufactured by using same preparation method, and corrugated cardboard box

Abstract

The present invention relates to a method for preparing an eco-friendly functional corrugated-cardboard adhesive composition for food preservation, corrugated cardboard manufactured by using the preparation method, and a corrugated cardboard box. The method for preparing an eco-friendly functional corrugated-cardboard adhesive composition for food preservation includes using modified starch that is made by mixing native starch, zeolite, and magnesium silicate.

Description

Method for manufacturing an eco-friendly functional adhesive composition for corrugated cardboard for food preservation, and corrugated cardboard and corrugated cardboard boxes manufactured by the method

[0001] The present invention relates to a method for manufacturing an eco-friendly functional adhesive composition for corrugated cardboard for food preservation with enhanced freshness-preserving function, and to corrugated cardboard and corrugated cardboard boxes manufactured by the method.

[0002] Corrugated cardboard, typically used in packaging boxes, is made by gluing cardboard to both sides (inner and outer) of a corrugated core formed into a wave shape using a machine called a corrugator, enhancing its cushioning properties. It is primarily used in the manufacture of packaging boxes. Conventional corrugated cardboard packaging boxes use an adhesive made from 100% cornstarch, sized by weight, on a sizing machine.

[0003] However, corn starch is also a valuable resource for feed and food. Recently, unpredictable harvests due to climate change have led to a steep rise in international grain prices. This, coupled with the exacerbation of food and feed shortages due to mass industrial consumption, has led to price spikes and other problems. To address the challenges of corn starch supply and price volatility, solutions such as the addition or substitution of other ingredients have become necessary.

[0004] In addition, fresh agricultural products such as fruits, vegetables, and flowers have a short freshness retention period during the cultivation, distribution, and consumption processes, which leads to food waste loss and methane gas emissions due to crop spoilage, which has an impact on the global food shortage and climate crisis, and it has become necessary to solve this problem.

[0005] And since the main material of cardboard boxes is paper, strength is an issue, so an adhesive is needed to make cardboard boxes with strength that is even stronger than that of conventional boxes.

[0006] [Prior Art Literature]

[0007] (Patent Document 1) Korean Patent Registration No. 10-1527783 (June 10, 2015)

[0008] The purpose of the present invention is to provide a method for manufacturing an eco-friendly functional adhesive composition for corrugated cardboard for food preservation, which can replace a certain portion of cornstarch in adhesive for corrugated cardboard, thereby reducing the consumption of cornstarch, extending the freshness period of stored contents such as fruits and vegetables, and enhancing the strength of corrugated cardboard boxes, and corrugated cardboard and corrugated cardboard boxes manufactured by the method.

[0009] The above-described object of the present invention can be achieved by a method for producing an eco-friendly functional adhesive composition for food preservation, characterized in that it includes a modified starch made by mixing general starch, zeolite, and magnesium silicate.

[0010] The above modified starch is characterized in that it is made by mixing 12 to 34 parts by weight of the zeolite and 5 to 21 parts by weight of the magnesium silicate per 100 parts by weight of the general starch.

[0011] The above general starch is characterized by being at least one selected from the group consisting of corn starch, tapioca starch, potato starch, sweet potato starch, and wheat starch.

[0012] A first mixing step of preparing a first mixture by adding 10 to 20 parts by weight of caustic soda and 700 to 900 parts by weight of water per 100 parts by weight of modified starch; a first stirring step of stirring the first mixture at 20 to 30°C for 3 to 7 minutes; a second mixing step of preparing a second mixture by adding 1300 to 1500 parts by weight of water, 400 to 500 parts by weight of modified starch, 8 to 12 parts by weight of borax, and 8 to 12 parts by weight of an additive to the first mixture obtained through the first stirring step, based on 100 parts by weight of the modified starch in the first mixing step; And a second stirring step of stirring the secondary mixture at 20 to 30°C for 8 to 12 minutes; wherein the modified starch is characterized in that it is made by mixing general starch, zeolite, and magnesium silicate.

[0013] A carrier mixture mixing step of adding 10 to 20 parts by weight of caustic soda and 700 to 900 parts by weight of water at 50 to 60°C per 100 parts by weight of modified starch to produce a carrier mixture; a carrier stirring step of stirring the carrier mixture for 8 to 12 minutes; a dropping step of dropping the stirred carrier mixture onto the main mixture; a main mixture mixing step of adding 1300 to 1500 parts by weight of water, 400 to 500 parts by weight of modified starch, 8 to 12 parts by weight of borax, and 8 to 12 parts by weight of an additive to the carrier mixture based on 100 parts by weight of the modified starch of the carrier mixture mixing step to produce a main mixture; And a second stirring step of stirring the secondary mixture at 20 to 30°C for 8 to 12 minutes; wherein the modified starch is characterized in that it is made by mixing general starch, zeolite, and magnesium silicate.

[0014] The additive is characterized in that it is at least one selected from the group consisting of calcium carbonate, bentonite, and stearic acid.

[0015] According to the present invention, it provides a groundbreaking solution to food and feed shortages by reducing the consumption of corn starch, and at the same time, it extends the freshness retention period of agricultural products by 3 to 10 times compared to conventional cardboard boxes with its antibacterial and moisture-proof function, thereby drastically reducing agricultural product loss, thereby alleviating food shortages, resolving distribution logistics problems, and preventing climate crisis by reducing methane gas emissions.

[0016] Additionally, the strength of the box itself is significantly enhanced compared to regular cardboard boxes, which results in cost savings through reduced paper input and reduced consumption of forest resources, which are a source of carbon dioxide absorption.

[0017] Figure 1 is a manufacturing process diagram illustrating the manufacturing process of an eco-friendly functional cardboard adhesive composition for food preservation using the original tank method of the present invention.

[0018] Figure 2 is a manufacturing process diagram illustrating the manufacturing process of an eco-friendly functional cardboard adhesive composition for food preservation using the two-tank method of the present invention.

[0019] Figure 3 is a photograph of the results of a test to maintain the freshness of apples using a cardboard box to which an eco-friendly functional cardboard adhesive composition for food preservation of the present invention has been applied.

[0020] Figure 4 is a photograph of the results of a test to maintain the freshness of cucumbers using a cardboard box to which an eco-friendly functional adhesive composition for food preservation of the present invention has been applied.

[0021] Figure 5 is a photograph of the results of a test to maintain the freshness of rice using a cardboard box to which an eco-friendly functional adhesive composition for food preservation of the present invention has been applied.

[0022] Figure 6 is a comparative table of the results of a strength test of a cardboard box to which an eco-friendly functional cardboard adhesive composition for food preservation of the present invention is applied.

[0023] Figure 7 is a drawing of an embodiment of a cardboard box using an eco-friendly functional adhesive composition for food preservation of the present invention.

[0024] A method for manufacturing an eco-friendly functional adhesive composition for corrugated cardboard according to one embodiment of the present invention includes a modified starch produced by mixing general starch, zeolite, and magnesium silicate.

[0025] The following is a detailed description of a preferred embodiment based on the attached drawings.

[0026] The embodiments described below are intended to be detailed enough to enable a person having ordinary skill in the art to easily practice the invention, and do not mean that the technical idea and scope of the present invention are limited thereby.

[0027] In addition, the size and shape of the components depicted in the drawings may be exaggerated for clarity and convenience of explanation, and terms specifically defined in consideration of the configuration and operation of the present invention may vary depending on the intention or custom of the user or operator, and it is to be noted that the definitions of these terms should be made based on the contents throughout this specification.

[0028]

[0029] Among the attached drawings, Fig. 1 is a manufacturing process diagram showing a process for manufacturing an eco-friendly functional corrugated cardboard adhesive composition for food preservation by the one-tank method of the present invention, Fig. 2 is a manufacturing process diagram showing a process for manufacturing an eco-friendly functional corrugated cardboard adhesive composition for food preservation by the two-tank method of the present invention, Fig. 3 is a photograph of the result of a freshness maintenance test of apples using a corrugated cardboard box to which the eco-friendly functional corrugated cardboard adhesive composition for food preservation of the present invention is applied, Fig. 4 is a photograph of the result of a freshness maintenance test of cucumbers using a corrugated cardboard box to which the eco-friendly functional corrugated cardboard adhesive composition for food preservation of the present invention is applied, Fig. 5 is a photograph of the result of a freshness maintenance test of rice using a corrugated cardboard box to which the eco-friendly functional corrugated cardboard adhesive composition for food preservation of the present invention is applied, Fig. 6 is a comparative table of the results of a strength test of a corrugated cardboard box to which the eco-friendly functional corrugated cardboard adhesive composition for food preservation of the present invention is applied, and Fig. 7 is a table showing the results of a strength test of a corrugated cardboard box to which the eco-friendly functional corrugated cardboard adhesive composition for food preservation of the present invention is applied, and This is a drawing of an embodiment of a cardboard box to which an adhesive composition is applied.

[0030]

[0031] The adhesive for corrugated board of the invention is an adhesive used for bonding a liner, which is a corrugated board base paper, and a corrugated board core. When manufacturing corrugated board, the adhesive is transferred to the corrugated board core and, by receiving heat and pressure in a corrugator, the starch component in the adhesive is degraded and the viscosity rapidly increases, thereby exerting initial adhesive force. In a subsequent drying process, the adhesive is dried and bonding is completed.

[0032] The present invention can be achieved by a method for producing an eco-friendly functional adhesive composition for corrugated cardboard for food preservation, characterized in that it includes modified starch produced by mixing general starch, zeolite, and magnesium silicate.

[0033] When using cornstarch alone as the starch ingredient in adhesive compositions, the need to add chemicals to enhance bonding strength arises. Furthermore, the use of cornstarch necessitates the use of sterilizers due to its perishability, which poses environmental problems due to the use of chemicals. Furthermore, moisture absorption can lead to a decrease in strength.

[0034] Also, in the case of bonding, if corn starch is used, the problem of internal penetration of the adhesive also occurs.

[0035]

[0036] The starch used in the preparation of the adhesive composition may be prepared using either a wet blending or a dry blending method. Furthermore, the composition may be prepared using either the no-carrier method or the Stein-Hall method, preferably the Stein-Hall method. In this case, the composition may be prepared using either the one-tank method or the two-tank method.

[0037]

[0038] As an example, in the case of the one-tank method among the stain hall methods according to the present invention, a first mixing step (S101) of preparing a first mixture by adding 10 to 20 parts by weight of caustic soda and 700 to 900 parts by weight of water per 100 parts by weight of modified starch; a first stirring step (S102) of stirring the first mixture at 20 to 30°C for 3 to 7 minutes; a second mixing step (S103) of preparing a second mixture by adding 1300 to 1500 parts by weight of water, 400 to 500 parts by weight of modified starch, 8 to 12 parts by weight of borax, and 8 to 12 parts by weight of an additive to the first mixture that has undergone the first stirring step, based on 100 parts by weight of the modified starch in the first mixing step; The adhesive composition of the present invention is manufactured through a second stirring step (S104) of stirring the secondary mixture at 20 to 30°C for 8 to 12 minutes.

[0039] The above modified starch can be made by mixing regular starch, zeolite, and magnesium silicate.

[0040]

[0041] In addition, as another embodiment, in the case of the two-tank method among the Stain Hall methods according to the present invention, a carrier mixture is prepared by adding 10 to 20 parts by weight of caustic soda and 700 to 900 parts by weight of water at 50 to 60°C per 100 parts by weight of modified starch, a carrier mixture mixing step (S201); a carrier mixture stirring step (S202) of stirring the carrier mixture for 8 to 12 minutes; a dropping step (S203) of dropping the stirred carrier mixture onto the main mixture; a main mixture mixing step (S204) of adding 1300 to 1500 parts by weight of water, 400 to 500 parts by weight of modified starch, 8 to 12 parts by weight of borax, and 8 to 12 parts by weight of an additive to the carrier mixture based on 100 parts by weight of the modified starch of the carrier mixture mixing step, to prepare a main mixture; And the adhesive composition of the present invention is manufactured through a main stirring step (S205) of stirring the main mixture for 10 to 20 minutes.

[0042] As with the one-tank method, the modified starch can be made by mixing regular starch, zeolite, and magnesium silicate.

[0043]

[0044] The above modified starch may be made by mixing 100 parts by weight of regular starch, 12 to 34 parts by weight of zeolite, and 5 to 21 parts by weight of magnesium silicate.

[0045]

[0046] Zeolites are minerals formed by the binding of alkali and alkaline earth metals with anions formed by the combination of aluminum oxide and silicate oxide. In a broader sense, they include crystalline aluminum silicate minerals. Because they contain exchangeable cations within their crystal structure, they possess ion-exchange properties, allowing them to readily exchange with other cations. This property can be utilized to concentrate and recover harmful substances or beneficial components within soil. Recently, zeolites, in which some of the cations in the zeolite are replaced with anions, have been utilized as food quality and freshness preservatives due to their antibacterial properties.

[0047]

[0048] Magnesium silicate has a composition of 2MgO·3SiO2·nH2O (Mg2Si3O8·nH2O) and is used as an adsorbent and antacid in various fields such as food and medicine in powder form.

[0049] Methods for synthesizing magnesium silicate include precipitation, hydrothermal precipitation, and mechanochemical dehydration. The precipitation method involves reacting a water-soluble magnesium salt with soluble sodium silicate in an aqueous solution to precipitate the insoluble magnesium silicate, which is then separated and dried. Using this method, needle-shaped magnesium silicate is synthesized.

[0050] Recently, spherical magnesium silicate has been in demand to improve properties such as adsorption capacity and filtration speed. Spray drying is primarily used to synthesize this spherical magnesium silicate.

[0051] In the present invention, it is preferable to use spherical magnesium silicate, as adsorption power and filtration speed are important in adsorption of moisture and harmful substances in food, etc.

[0052] The adhesive composition of the present invention, when applied to cardboard, contains ultra-fine pores. This helps to prevent harmful gases from being released without being sealed.

[0053] Equipped with gas absorption capabilities, it absorbs and removes harmful gases, such as ethylene gas and carbon dioxide, from stored items, thereby maintaining freshness within the product and the box itself for extended periods. Furthermore, it absorbs moisture within the cardboard box and releases it when dry, maintaining optimal moisture levels. Furthermore, its high level of far-infrared radiation also contributes to maintaining freshness.

[0054] Conventional eco-friendly functional cardboard adhesive compositions for food preservation could not be reused due to concerns about starch decay, but the present invention has the advantage of being reusable and maintaining viscosity due to its own antibacterial function.

[0055]

[0056] The above general starch may be at least one selected from the group consisting of corn starch, tapioca starch, potato starch, sweet potato starch, and wheat starch.

[0057] Cornstarch is extracted from the endosperm of corn. It is the whitest of all starches and has the finest particles. When cornstarch is heated with water, it gelatinizes and becomes viscous, but its viscosity is weaker than that of potato starch. However, it has excellent stability and strong adhesive properties. Cornstarch is widely used. This is because it is cheaper than other starches, is produced in large quantities, and is safe and has strong adhesive properties. However, because it is also used for food and feed, excessive consumption may hinder its distribution in other applications.

[0058] Tapioca starch is a starch obtained from the root of the cassava plant. It is purified from the starch obtained by washing, peeling, grinding, and sieving the cassava rhizome, and then drying it in the sun or hot air. It is used as a raw material for tapioca macaroni, confectionery, starch syrup, glucose, and alcohol. Tapioca starch has a low amylose content, is easy to gelatinize, and is difficult to retrograde. These properties are utilized in the textile industry, pulp, adhesives, and chemical starch. It is also imported in pellet form and mixed with other feeds for use as livestock feed.

[0059] In addition, potato or sweet potato starch can be used as a starch component in adhesives for corrugated cardboard.

[0060]

[0061] The additive may be at least one selected from the group consisting of calcium carbonate, bentonite, and stearic acid.

[0062] Calcium carbonate is a calcium carbonate and is found in marble, calcite, arsenite, limestone, chalk, glacierite, seashells, eggshells, coral, etc. It is used as a main raw material for cement, a raw material for calcium oxide, and various neutralizing agents for iron and steelmaking and building materials. It is also used as a reinforcing agent, and is possible as a reinforcing agent to strengthen the adhesive strength of the present invention.

[0063] Bentonite is a clay containing primarily montmorillonite, a monoclinic mineral with a crystal structure similar to mica. Its colors include white, gray, light brown, and light green, and it is used in various fields such as a binder for castings, an admixture for ceramic raw materials, and a base for ointments. Stearic acid has a molecular formula of C. 18 H 36 It is a solid at room temperature (melting point 69.3°C) as an O2-saturated fatty acid, and its IUPAC name is octadecanoic acid. Stearic acid and its salts are used as adhesive additives in foods and pharmaceuticals. Bentonite and stearic acid function as additives to enhance adhesive strength.

[0064]

[0065] <Example 1>

[0066] An environmentally friendly functional adhesive composition for food preservation of the present invention was manufactured using the following method. This is a manufacturing process using the one-tank method.

[0067] 1. Manufacturing steps of modified starch

[0068] It was prepared by mixing 414g of corn starch, 37g of zeolite, and 99g of magnesium silicate.

[0069] 2. First mixing stage (S101)

[0070] A primary mixture was prepared by adding 100 g of the above modified starch, 15 g of caustic soda, and 800 g of water.

[0071] 3. First stirring stage (S102)

[0072] The above primary mixture was stirred at 25°C for 5 minutes.

[0073] 4. Second mixing stage (S103)

[0074] After the first stirring step, 1400 g of water, 450 g of modified starch, 10 g of borax, and 10 g of calcium carbonate were added to prepare a second mixture.

[0075] 5. Second mixing stage (S104)

[0076] The above secondary mixture was stirred at 25°C for 10 minutes.

[0077] 6. Packaging stage

[0078] The above-mentioned eco-friendly functional cardboard adhesive composition for food preservation was placed in a container and sealed for packaging.

[0079]

[0080] <Example 2>

[0081] In Example 1, 1. The manufacturing step of modified starch was changed to manufacturing by mixing 413 g of corn starch, 50 g of zeolite, and 87 g of magnesium silicate.

[0082]

[0083] <Example 3>

[0084] In Example 1, 1. The manufacturing step of modified starch was changed to manufacturing by mixing 404 g of corn starch, 76 g of zeolite, and 70 g of magnesium silicate.

[0085]

[0086] <Example 4>

[0087] In Example 1, 1. The manufacturing step of modified starch was changed to manufacturing by mixing 400 g of corn starch, 95 g of zeolite, and 55 g of magnesium silicate.

[0088]

[0089] <Example 5>

[0090] In Example 1, 1. The manufacturing step of modified starch was changed to manufacturing by mixing 395 g of corn starch, 114 g of zeolite, and 41 g of magnesium silicate.

[0091]

[0092] <Example 6>

[0093] In Example 1, 1. The manufacturing step of modified starch was changed to manufacturing by mixing 395 g of corn starch, 135 g of zeolite, and 20 g of magnesium silicate.

[0094]

[0095] <Example 7>

[0096] In Example 1, 1. The manufacturing step of modified starch was changed to manufacturing by mixing 387 g of corn starch, 151 g of zeolite, and 12 g of magnesium silicate.

[0097]

[0098] <Example 8>

[0099] In Example 4, 4. As an additive in the second mixing stage, calcium carbonate was reduced to 5 g, and 5 g of bentonite was additionally added.

[0100]

[0101] <Example 9>

[0102] In Example 4, 4. As an additive in the second mixing step, calcium carbonate was reduced to 5 g, and 5 g of stearic acid was additionally added.

[0103]

[0104] <Example 10>

[0105] In Example 4, 4. In the second mixing step, 5 g of bentonite and 5 g of stearic acid were added instead of calcium carbonate as additives.

[0106]

[0107] <Example 11>

[0108] In Example 4, 10 g of bentonite was added instead of calcium carbonate as an additive in the 4th mixing step.

[0109]

[0110] <Example 12>

[0111] It was manufactured using the two-tank method.

[0112] 1. Manufacturing steps of modified starch

[0113] It was prepared by mixing 400g of corn starch, 95g of zeolite, and 55g of magnesium silicate.

[0114] 2. Carrier mixing stage (S201)

[0115] A carrier mixture was prepared by adding 100 g of modified starch, 15 g of caustic soda, and 800 g of water at 50 to 60°C.

[0116]

[0117] 3. Carrier stirring stage (S202)

[0118] The above carrier mixture was stirred for 8 to 12 minutes.

[0119] 4. Falling stage (S203)

[0120] A process of dropping the stirred carrier mixture onto the main part was performed.

[0121] 5. Main mixing stage (S204)

[0122] A main mixture was prepared by adding 1400 g of water, 450 g of modified starch, 10 g of borax, and 10 g of calcium carbonate to the above carrier mixture.

[0123] 6. Main stirrer stage (S205)

[0124] The above main mixture was stirred for 15 minutes.

[0125] 7. Packaging stage

[0126] The above-mentioned eco-friendly functional cardboard adhesive composition for food preservation was placed in a container and sealed for packaging.

[0127]

[0128] <Comparative Example>

[0129] In Example 1, 1. Instead of the step of manufacturing modified starch, 550 g of corn starch was prepared.

[0130]

[0131] The performance test results of the compositions except for Examples 1 and 7 were generally similar, so when comparing with the comparative examples, some tests were performed only for Example 4 and described.

[0132]

[0133] Comparative Examples Example 1 Example 2 Example 3 Example 4 and 12 Example 5 Example 6 Example 7 Example 8 Example 9 Example 10 11 Cornstarch 550 41 44 1 3 40 44 0 0 3 9 5 3 9 5 3 8 7 40 0 ​​40 0 ​​40 0 ​​Zeolite 37 50 76 9 5 1 1 4 1 3 5 1 5 1 9 5 9 5 9 5 9 5 Magnesium silicate 9 9 8 7 7 0 5 4 1 2 5 ...

[0134] The unit is g.

[0135]

[0136] Freshness retention test

[0137] We tested the period of time during which fruits and vegetables can be stored fresh in cardboard boxes, i.e. the period during which they can be kept fresh.

[0138] As a result of a freshness preservation test conducted on apples placed in cardboard boxes manufactured using the eco-friendly functional adhesive compositions for food preservation manufactured by Comparative Examples and Examples 1 to 12 (storage temperature: 24 to 25 degrees Celsius, humidity 50 to 60%), the Comparative Examples could be stored for about 4 days, but Examples 2 to 6 and Examples 8 to 12 of the present invention could be stored for more than 10 days, proving their superior freshness preservation efficacy. As a result of the function of the composition, decay was delayed by adsorption and removal of ethylene gas emitted from crops, thereby maintaining a fresh state for a long time. This will solve the problem of reduced farm income due to the problems of early harvesting and shipment during the distribution process due to crops not being grown until the peak ripening period due to a short ripening decay period, as well as the problem of food loss due to disposal due to decay, and ultimately the fundamental direction of agriculture to deliver the best taste to consumers in the peak ripening state. There was no significant difference in freshness retention efficacy between Examples 2 to 6 and Examples 8 to 12 of the present invention. However, Examples 1 and 7 allowed storage for up to 4 to 5 days, showing no significant difference in efficacy compared to the comparative example. Figure 3 is a photograph of the results of this test conducted using the comparative example and Example 4.

[0139]

[0140] Likewise, as a result of a freshness retention test on cucumbers (storage temperature: 24-25 degrees, humidity 50-60%), the comparative example could be stored for about 4 days, but examples 2 to 6 and examples 8 to 12 of the present invention could be stored for more than 13 days, proving that they also had superior freshness retention efficacy. However, examples 1 and 7 could be stored for up to 5 to 6 days, showing no significant difference in efficacy from the comparative example. Fig. 4 is a photograph of the results of the test conducted by applying the comparative example and example 4.

[0141]

[0142] The results of the rice freshness preservation test also demonstrated that Examples 2 to 6 and Examples 8 to 12 had significantly superior freshness preservation efficacy compared to the Comparative Example after three months. They were excellent in adsorbing harmful gases and microorganisms in the air inside the rice container, controlling moisture, and providing an insect repellent effect and slowing down oxidation. The present invention appears to be able to solve various problems of conventional rice containers. Figure 5 is a photograph of the results of this test conducted using the Comparative Example and Example 4.

[0143]

[0144] For other crops, freshness preservation tests were also performed using cardboard boxes to which the compositions of Comparative Examples and Examples 2 to 6 and Examples 8 to 12 were applied.

[0145] As a result of the freshness preservation test, tangerines could be stored for 20 to 40 days in the comparative example, and for 90 to 100 days in the examples 2 to 6 and 8 to 12, pears could be stored for 2 to 7 days in the comparative example, and for 20 to 25 days in the examples 2 to 6 and 8 to 12, and cabbages could be stored for 5 to 6 days in the comparative example, and for 20 to 25 days in the examples 2 to 6 and 8 to 12.

[0146]

[0147] Strength testing of cardboard boxes

[0148] A strength test was conducted to compare the strength of a box manufactured using an eco-friendly functional cardboard adhesive composition for food preservation manufactured by the method of the comparative example above and a box manufactured using an eco-friendly functional cardboard adhesive composition for food preservation manufactured by the method of Example 4 of the present invention.

[0149] As shown in Figure 6, the test results showed that despite a 20% reduction in box weight, the compressive strength increased by approximately 20%. The breaking strength also increased by approximately 4%. Therefore, the use of a lighter box not only reduces environmental impact and facilitates transport, but also increases the strength of the box itself. Furthermore, the cost-saving effect is also remarkable.

[0150] In corrugated cardboard consisting of a surface paper, a corrugated paper, and a surface paper, an adhesive is inserted between each component to exert adhesive force. In contrast, the adhesive for general corrugated cardboard manufactured by the conventional comparative example has a problem of seeping into the corrugated paper, and thus the proportion of the portion that actually exerts adhesive force is low, the eco-friendly functional adhesive composition for corrugated cardboard manufactured by the method of Example 4 of the present invention for food preservation does not seep into the paper or flow down, and due to its excellent adhesive force, it is intensively used to bond the ends of the corrugated paper and the surface paper.

[0151]

[0152] Corrugated cardboard can be manufactured using the adhesive composition for environmentally friendly functional corrugated cardboard for food preservation manufactured by the above manufacturing method, and a corrugated cardboard box can be manufactured using the corrugated cardboard.

[0153] The cardboard box (100) may preferably include a transparent window (120), an inner cover (130), a lid handle (140), and an easy cap (a lid that allows easy removal of internally stored crops such as rice, 150) in the cardboard box body (110), as shown in FIG. 7.

[0154]

[0155] Although described with reference to preferred embodiments, it will be readily apparent to those skilled in the art that various modifications and variations are possible without departing from the spirit and scope of the invention, and it is self-evident that all such modifications and variations fall within the scope of the appended claims.

[0156] [Explanation of symbols]

[0157] S101: 1st mixing stage S102: 1st stirring stage

[0158] S104: Second mixing stage S105: Second stirring stage

[0159] S201: Carrier mixing stage S202: Carrier stirring stage

[0160] S203: Falling stage S204: Main mixing stage

[0161] S205: Main mixing stage 100: Cardboard box

[0162] 110: Cardboard box body 120: Transparent window

[0163] 130: Inner lining 140: Lid handle

[0164] 150: Easy Cap

Claims

1. A first mixing step of preparing a first mixture by adding 10 to 20 parts by weight of caustic soda and 700 to 900 parts by weight of water per 100 parts by weight of modified starch; A first stirring step of stirring the above primary mixture at 20 to 30°C for 3 to 7 minutes; A second mixing step of preparing a second mixture by adding 1300 to 1500 parts by weight of water, 400 to 500 parts by weight of modified starch, 8 to 12 parts by weight of borax, and 8 to 12 parts by weight of additives based on 100 parts by weight of modified starch in the first mixing step to the first mixture that has gone through the first mixing step; and A second stirring step of stirring the secondary mixture at 20 to 30°C for 8 to 12 minutes; Including, but not limited to, The above modified starch is made by mixing regular starch, zeolite and magnesium silicate. The above modified starch is made by mixing 12 to 34 parts by weight of the zeolite and 5 to 21 parts by weight of the magnesium silicate per 100 parts by weight of the general starch. The above common starch is corn starch or tapioca starch, A method for producing an eco-friendly functional adhesive composition for food preservation, characterized in that the additive is at least one selected from the group consisting of calcium carbonate, bentonite, and stearic acid.

2. A carrier mixture mixing step of making a carrier mixture by adding 10 to 20 parts by weight of caustic soda and 700 to 900 parts by weight of water at 50 to 60°C per 100 parts by weight of modified starch; A carrier stirring step of stirring the carrier mixture for 8 to 12 minutes; A dropping step of dropping the stirred carrier mixture onto the main part; A main mixing step for preparing a main mixture by adding 1300 to 1500 parts by weight of water, 400 to 500 parts by weight of modified starch, 8 to 12 parts by weight of borax, and 8 to 12 parts by weight of an additive based on 100 parts by weight of the modified starch of the carrier mixing step to the carrier mixture; and A main stirring step of stirring the main mixture for 10 to 20 minutes; Including, but not limited to, The above modified starch is made by mixing regular starch, zeolite and magnesium silicate. The above modified starch is made by mixing 12 to 34 parts by weight of the zeolite and 5 to 21 parts by weight of the magnesium silicate per 100 parts by weight of the general starch. The above common starch is corn starch or tapioca starch, A method for producing an eco-friendly functional adhesive composition for food preservation, characterized in that the additive is at least one selected from the group consisting of calcium carbonate, bentonite, and stearic acid.

3. Corrugated cardboard manufactured using an adhesive composition for eco-friendly functional corrugated cardboard for food preservation manufactured by the manufacturing method of the above-mentioned clause 1 or 2.

4. A cardboard box made of the cardboard of the above clause 3.

Images