Easily degradable packaging box blank and manufacturing method thereof

Abstract

The invention discloses an easily degradable packaging box blank and a manufacturing method thereof, and is characterized in that the easily degradable packaging box blank comprises wood pulp layers, gap layers and a film covering layer, at least n + 1 wood pulp layers and n gap layers are arranged, n is greater than or equal to 1, the wood pulp layers and the gap layers are sequentially and alternately laminated, and the film covering layer is formed by laminating the wood pulp layers and the gap layers. The outer side of the first wood pulp layer and the outer side of the (n + 1) th wood pulp layer are coated with the film coating layers; the gap layer is of a grid structure, a line part of the grid structure is filled with wood pulp, and an empty groove part of the grid structure is filled with biological enzyme and / or microbial flora; and the film coating layer is made of PLA (Polylactic Acid). Bio-enzyme and microbial flora are added into the easily degradable packaging box blank, and the bio-enzyme can play a role in degrading wood pulp components; and the PLA material can be effectively degraded by the microbial flora. Due to the fact that the bio-enzyme and the microbial bacteria are evenly added to the multiple layers of the packaging box blank, in the decomposition process, the bio-enzyme and the microbial bacteria can quickly penetrate into the packaging box blank, and decomposition of the packaging box blank is accelerated from inside to outside.

Description

Technical Field

[0001] The present invention belongs to the technical field of packaging boxes, and relates to a degradable packaging box blank and a manufacturing method thereof. Background Art

[0002] In today's society, environmental protection issues have become the focus of global attention. With the rapid economic development and the improvement of people's living standards, the usage of various packaging materials has increased sharply. Among them, paper packaging materials have been widely used in many fields such as food, daily necessities, and electronic products due to their advantages of low cost and strong printability.

[0003] Traditional paper packaging adds adhesives, waterproof materials, etc. in the production process, and its degradation rate in the natural environment is relatively slow; some existing degradable paper products require specific composting conditions for degradation. Therefore, a large number of waste paper products are piled up in landfills, occupying a large amount of land resources. Summary of the Invention

[0004] In order to solve the above problems, the present invention aims to develop a degradable packaging box blank and a manufacturing method thereof. By optimizing the structure, raw material formula and production process of the paper box blank, it can be rapidly degraded in the natural environment, and at the same time meet the basic performance requirements of packaging materials in terms of strength, waterproofness, print adaptability, etc. The following technical solutions are adopted:

[0005] In a first aspect, a degradable packaging box blank includes a wood pulp layer, a gap layer and a film coating layer. There are at least n + 1 layers of the wood pulp layer and n layers of the gap layer, where n≥1. The wood pulp layer and the gap layer are alternately stacked in sequence, and the film coating layer is coated on the outer sides of the first layer of the wood pulp layer and the n + 1 layer of the wood pulp layer;

[0006] The gap layer is a grid structure, the line part of the grid structure is filled with wood pulp, and the empty slot part of the grid structure is filled with biological enzymes and / or microbial bacteria;

[0007] The film coating layer is made of PLA.

[0008] As a further scheme of the present invention: the biological enzymes and / or microbial bacteria are coated with a polyvinyl alcohol film.

[0009] As a further scheme of the present invention: the wood pulp layer is made of a mixture of 60%-80% softwood pulp and 20%-40% hardwood pulp or herb pulp.

[0010] As a further scheme of the present invention: the line part of the grid structure is made of softwood pulp.

[0011] As a further scheme of the present invention: the biological enzymes include, but are not limited to, one or more of cellulase, protease or lipase.

[0012] As a further solution of the present invention: the microbial bacteria include, but are not limited to, one or more of Bacillus, Pseudomonas or white rot fungi.

[0013] As a further solution of the present invention: it further includes an ink layer, the ink layer is on the film layer, and the ink layer uses soybean ink or water-based ink.

[0014] In a second aspect, a method for manufacturing a degradable packaging box blank includes the following steps:

[0015] Mix 60%-80% softwood pulp and 20%-40% hardwood pulp or herb pulp, dilute them, and evenly spray them onto a moving screen mesh. After preliminary dehydration and forming into a wet paper sheet, multiple groups of rollers squeeze the wet paper sheet to reduce the moisture content to 40-50% to form a wood pulp layer.

[0016] Heat the PLA film or particles to a molten state, and compound them with the first layer of wood pulp layer by a pressing method, and compound them with the (n + 1)-th layer of wood pulp layer by a pressing method.

[0017] Mix the bioenzyme solution and / or microbial bacteria solution with the polyvinyl alcohol solution, and dry to form particles.

[0018] Mix the starch-based adhesive with the particles to form a mixture.

[0019] Dot the mixture on the first layer of wood pulp layer, apply softwood pulp in the non-dotted area to form the first layer of gap layer; cover the second layer of wood pulp layer on the first layer of gap layer; dot the mixture on the second layer of wood pulp layer, apply softwood pulp in the non-dotted area to form the second layer of gap layer; cover the third layer of wood pulp layer on the second layer of gap layer; stack them in sequence, dot the mixture on the n-th layer of wood pulp layer, apply softwood pulp in the non-dotted area to form the n-th layer of gap layer; cover the (n + 1)-th layer of wood pulp layer on the n-th layer of gap layer.

[0020] Compound several layers of wood pulp layers and gap layers by a pressing method, and let it stand in a dry environment for 1-3 hours to form a degradable packaging box blank.

[0021] As a further solution of the present invention: natural degradation promoters are added to the softwood pulp, hardwood pulp or herb pulp.

[0022] As a further solution of the present invention: xylitol, polyethylene glycol or glycerol is added to the bioenzyme solution and microbial bacteria solution.

[0023] The beneficial effects of the present invention:

[0024] A degradable packaging box blank is formed by laminating a wood pulp layer and a gap layer, which ensures the characteristics of the paper, has a certain strength, and can be folded into a paper box to meet the load-bearing and forming requirements in daily use. The film coating layer is made of PLA and has a certain waterproof property, which can effectively block the penetration of moisture, thereby extending the service life of the paper box. Among them, both the wood pulp layer and the gap layer are made of wood pulp, and the film coating layer is made of PLA material, all of which are degradable materials. Bioenzymes and microbial bacteria are added to the packaging box blank. The bioenzymes can play a degradation role on these wood pulp components; the microbial bacteria can effectively degrade the PLA material. Since the bioenzymes and microbial bacteria are evenly added to multiple layers of the packaging box blank, during the decomposition process, the enzymes and bacteria can be evenly distributed and can quickly penetrate deep into the interior of the packaging box blank, accelerating its decomposition from the inside out.

[0025] When the packaging box blank is discarded, soaking the packaging box blank in water will cause the bioenzymes and microbial bacteria to quickly and fully dissolve in the water, thereby accelerating the decomposition process of the packaging box blank. If the packaging box is cut and shredded, the bioenzymes and microbial bacteria originally sealed inside will be released, greatly promoting the natural decomposition of the paper product packaging box blank and making the decomposition process more efficient. Brief Description of the Drawings

[0026] Figure 1 is a schematic structural diagram of a degradable packaging box blank;

[0027] Figure 2 is a flowchart of a manufacturing method of a degradable packaging box blank.

[0028] As shown in the figure, 1 - wood pulp layer, 2 - gap layer, 21 - line part, 22 - empty slot part, 3 - film coating layer. Detailed Embodiments

[0029] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. It should be understood that the present application is not limited by the exemplary embodiments disclosed herein. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0030] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention.

[0031] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, the meaning of "a plurality" is two or more, unless otherwise specifically defined.

[0032] In the embodiments of the present invention, unless otherwise clearly specified and limited, the terms "installation", "connection", "connection", "fixation", etc. shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0033] Example 1

[0034] As shown in the figure, a degradable packaging box blank includes a wood pulp layer, a gap layer, and a film coating layer. There are at least n + 1 wood pulp layers and n gap layers, where n ≥ 1. The wood pulp layers and the gap layers are alternately stacked in sequence. The outer sides of the first wood pulp layer and the (n + 1)-th wood pulp layer are coated with a film coating layer; the gap layer is a grid structure, the line parts of the grid structure are filled with wood pulp, and the empty groove parts of the grid structure are filled with biological enzymes and / or microbial bacteria; the film coating layer is made of PLA.

[0035] Specifically, a degradable packaging box blank is formed by laminating a wood pulp layer and a gap layer, which ensures the characteristics of the paper, has a certain strength, can be folded into a paper box, and meets the load-bearing and forming requirements in daily use; the film coating layer is made of PLA and has a certain waterproof property, which can effectively block the penetration of moisture, thereby extending the service life of the paper box. Among them, both the wood pulp layer and the gap layer are made of wood pulp, and the film coating layer is made of PLA material, both of which are degradable materials. Bioenzymes and microbial bacteria are added to the packaging box blank. The bioenzymes can play a degradation role on these wood pulp components; the microbial bacteria can effectively degrade the PLA material. Since the bioenzymes and microbial bacteria are evenly added to multiple layers of the packaging box blank, during the decomposition process, the enzymes and bacteria can be evenly distributed and can quickly penetrate deep into the interior of the packaging box blank, accelerating its decomposition from the inside to the outside.

[0036] When the packaging box blank is discarded, soaking the packaging box blank in water, the bioenzymes and microbial bacteria will quickly and fully dissolve in the water, thereby accelerating the decomposition process of the packaging box blank. If the packaging box is cut and shredded, the bioenzymes and microbial bacteria originally sealed inside will be released, greatly promoting the natural decomposition of the paper product packaging box blank and making the decomposition process more efficient.

[0037] In this embodiment, the bioenzymes and / or microbial bacteria are coated with a polyvinyl alcohol film.

[0038] Specifically, since the packaging box does not need to be decomposed during use, a polyvinyl alcohol film is used to store the bioenzymes and microbial bacteria. When discarded, soak the packaging box blank in water. The polyvinyl alcohol film usually dissolves quickly in cold water at 15 - 30 °C. Within about 15 - 60 seconds, sufficient water volume is required to trigger dissolution, such as soaking. During the daily use of the packaging box, in a dry environment (relative humidity < 60%), the film remains solid, the moisture content in the air is less, and the polyvinyl alcohol film can effectively block the trace moisture in the air and will not dissolve due to trace moisture. During the cutting and shredding process of the packaging box, the polyvinyl alcohol film will be damaged, releasing the bioenzymes and microbial bacteria.

[0039] In this embodiment, the wood pulp layer is made by mixing 60% - 80% softwood pulp and 20% - 40% hardwood pulp or herb pulp.

[0040] Specifically, softwood pulp has long fibers, high strength, and good toughness. The paper made has characteristics such as tear resistance and fold resistance; hardwood pulp has short fibers and high density, which can improve the smoothness and printing adaptability of the paper; herb pulp has short fibers and has good tensile strength, bursting strength, and tear strength. All three are made of natural materials, are relatively easy to process during the pulping process, and some herbaceous plants contain less chemical components themselves. The amount of chemical drugs used during pulping is relatively low, thereby reducing the emissions of wastewater, waste gas, and waste residue. The paper made is more easily decomposed by microorganisms in the natural environment.

[0041] In this embodiment, the line part of the grid structure is made of softwood pulp.

[0042] Specifically, the gap layer also needs to have a certain strength, so softwood pulp is selected as the raw material.

[0043] In this embodiment, the bio-enzyme includes one or more of, but is not limited to, cellulase, protease, or lipase.

[0044] Specifically, since the papermaking process goes through a high-temperature drying process, to maintain the activity of the bio-enzyme, heat-resistant cellulase, protease, and lipase are selected. Cellulase, protease, and lipase act synergistically to decompose the paper, and the paper gradually decomposes into small-molecule organic matter. Among them, cellulase can hydrolyze the cellulose of the packaging box blank into sugar; protein adhesives are used in the paper, and protease is used to decompose it. Ink is used for printing on the paper, and lipase is used to decompose it.

[0045] In this embodiment, the microbial bacteria include one or more of, but are not limited to, Bacillus, Pseudomonas, or white rot fungus.

[0046] Specifically, Bacillus, Pseudomonas, or white rot fungus are all bacteria widely present in nature. They can secrete a variety of extracellular enzymes and have a certain degradation ability for PLA materials. Different types of microorganisms have different degradation abilities for PLA, and even different strains of the same bacterial species may have different degradation effects. Therefore, multiple bacterial species need to be added in a mixture.

[0047] In this embodiment, it further includes an ink layer. The ink layer is on the laminating layer, and the ink layer uses soy ink or water-based ink. Specifically, natural ink is used for printing, which is convenient for decomposition.

[0048] In this embodiment, natural wax, such as beeswax, can also be applied to the laminating layer to increase the waterproofness of the packaging box blank.

[0049] Embodiment 2

[0050] As shown in the figure, a method for manufacturing a degradable packaging box blank is characterized in that the steps include:

[0051] After mixing and diluting 60%-80% softwood pulp and 20%-40% hardwood pulp or herb pulp, it is evenly sprayed onto a moving wire screen, and is initially dehydrated and formed into a wet paper sheet. Multiple groups of rollers extrude the wet paper sheet to reduce the water content to 40–50% to form a wood pulp layer;

[0052] Heat the PLA film or particles to a molten state and laminate them with the first-layer wood pulp layer, and laminate them with the (n + 1)-th layer wood pulp layer by a lamination method;

[0053] Mix the bio - enzyme solution and / or microbial bacteria solution with the polyvinyl alcohol solution, and form particles after drying;

[0054] Mix the starch - based binder with the particles to form a mixture;

[0055] Dot - coat the mixture on the first - layer wood pulp layer, and apply coniferous wood pulp in the non - dot - coated area to form the first - layer gap layer; Cover the first - layer gap layer with the second - layer wood pulp layer; Dot - coat the mixture on the second - layer wood pulp layer, and apply coniferous wood pulp in the non - dot - coated area to form the second - layer gap layer; Cover the second - layer gap layer with the third - layer wood pulp layer; Stack them in sequence. Dot - coat the mixture on the nth - layer wood pulp layer, and apply coniferous wood pulp in the non - dot - coated area to form the nth - layer gap layer; Cover the nth - layer gap layer with the (n + 1)th - layer wood pulp layer;

[0056] Compound several layers of wood pulp layers and gap layers by pressing, and let it stand in a dry environment for 1 - 3 hours to form a biodegradable packaging box blank.

[0057] Specifically, during the paper - making process from pressing to drying, the wet paper web contacts the surface of the drying cylinder heated by high - temperature steam to initially evaporate water, and then continue to dry with hot air.

[0058] To prevent the bio - enzyme and microbial bacteria from losing activity at high temperatures, first coat a film layer on the outer layer of the wood pulp and then press. Both the wood pulp layer and the gap layer are made of wood pulp. Stack the gap layer on the preliminarily dried wood pulp layer, uniformly combine them through a y - roller, and dry with hot air. During this period, use a cooling roller to reduce the temperature of the paper web to prevent adhesion or deformation during coiling.

[0059] Among them, mix the enzyme solution / bacteria solution with the polyvinyl alcohol solution and form particles through physical methods such as spray drying. The enzyme solution and the polyvinyl alcohol solution are mixed and instantaneously heated in the form of droplets for 0.01 - 5 seconds. The actual heat exposure time is extremely short, and the bio - enzyme and microbial bacteria can still maintain their activity.

[0060] Use a starch - based binder to bond the particles to the wood pulp layer. The starch - based binder is made of natural materials and has the characteristic of being easily degradable. Moreover, it has strong compatibility with cellulose fibers, high bonding strength, and good fusion with the wood pulp layer.

[0061] Among them, add natural degradation accelerators such as chitin and chitosan during the wood pulp stage. Their molecular structures can attract microorganisms such as fungi and bacteria in the soil to accelerate the decomposition of the paper.

[0062] Among them, add xylitol, polyethylene glycol, glycerol, etc. to the bio - enzyme solution and microbial bacteria solution to enhance the heat resistance of the bio - enzyme and improve the activity of the bio - enzyme. Xylitol, polyethylene glycol, and glycerol are all biodegradable materials.

[0063] A method for manufacturing a degradable packaging box blank is used to produce a degradable packaging box blank. For other beneficial effects, refer to the beneficial effects of a degradable packaging box blank, which will not be elaborated again here.

[0064] It should also be noted that in this text, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, such that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising a..." does not exclude the presence of additional identical elements in the process, method, article or device comprising the said element.

[0065] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present application. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to these embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A degradable packaging box blank, characterized in that, It includes a wood pulp layer, an interlayer and a film coating layer. There are at least n + 1 layers of the wood pulp layer and n layers of the interlayer, where n ≥ 1. The wood pulp layer and the interlayer are alternately stacked in sequence. The first layer of the wood pulp layer and the (n + 1)-th layer of the wood pulp layer are coated with the film coating layer on the outside; The interlayer is a grid structure. The line parts of the grid structure are filled with wood pulp, and the empty groove parts of the grid structure are filled with biological enzymes and / or microbial bacteria; The film coating layer is made of PLA.

2. The biodegradable packaging box blank according to claim 1, wherein, The biological enzymes and / or microbial bacteria are coated with a polyvinyl alcohol film.

3. The biodegradable packaging box blank according to claim 2, wherein The wood pulp layer is made by mixing 60% - 80% softwood pulp and 20% - 40% hardwood pulp or herb pulp.

4. The biodegradable packaging box blank according to claim 2, characterized in that, The line parts of the grid structure are made of softwood pulp.

5. The biodegradable packaging box blank according to claim 2, wherein, The biological enzymes include, but are not limited to, one or more of cellulase, protease or lipase.

6. The biodegradable packaging box blank according to claim 2, characterized in that, The microbial bacteria include, but are not limited to, one or more of Bacillus, Pseudomonas or white rot fungi.

7. The biodegradable packaging box blank according to claim 2, wherein It further includes an ink layer. The ink layer is on the film coating layer, and the ink layer uses soy ink or water-based ink.

8. A manufacturing method of an easily degradable packaging box blank, characterized in that the steps It includes: After mixing and diluting 60% - 80% softwood pulp and 20% - 40% hardwood pulp or herb pulp, evenly spray it onto a moving screen, and preliminarily dehydrate and form it into a wet paper sheet. Multiple groups of rollers extrude the wet paper sheet to reduce the water content to 40–50% to form a wood pulp layer; Heat the PLA film or particles to a molten state, and composite it with the first layer of the wood pulp layer by a pressing method, and composite it with the (n + 1)-th layer of the wood pulp layer by a pressing method; Mix the biological enzyme solution and / or microbial bacteria solution with the polyvinyl alcohol solution, and dry it to form particles; Mix the starch-based binder with the particles to form a mixture; Dot-apply the mixture on the first layer of the wood pulp layer, and apply softwood pulp in the non-dot-applied area to form the first layer of the interlayer; cover the second layer of the wood pulp layer on the first layer of the interlayer; dot-apply the mixture on the second layer of the wood pulp layer, and apply softwood pulp in the non-dot-applied area to form the second layer of the interlayer; cover the third layer of the wood pulp layer on the second layer of the interlayer; stack them in sequence. Dot-apply the mixture on the n-th layer of the wood pulp layer, and apply softwood pulp in the non-dot-applied area to form the n-th layer of the interlayer; cover the (n + 1)-th layer of the wood pulp layer on the n-th layer of the interlayer; Composite several layers of the wood pulp layer and the interlayer by a pressing method, and let it stand in a dry environment for 1 - 3 hours to form a biodegradable packaging box blank.

9. The manufacturing method of the degradable packaging box blank according to claim 8, characterized in that, Add natural degradation promoters to the softwood pulp, hardwood pulp or herb pulp.

10. The manufacturing method of the degradable packaging box blank according to claim 8, characterized in that, Add xylitol, polyethylene glycol or glycerol to the biological enzyme solution and the microbial bacteria solution.

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