Bio-based material food packaging box and preparation method thereof

Abstract

The invention discloses a bio-based material food packaging box, and relates to the field of food packaging, the bio-based material food packaging box comprises a box body, the box body comprises the following components in parts by weight: 35-46 parts of straw, 10-25 parts of bagasse, 3-8 parts of an antibacterial solvent, 6-8 parts of chitosan, 5-10 parts of sodium alginate, 1-5 parts of a cross-linking agent and 1-5 parts of a barrier agent, the bio-based material food packaging box comprises the box body, the box body comprises the following components in parts by weight: 35-46 parts of straw, 10-25 parts of bagasse, 3-8 parts of an antibacterial solvent, 6-8 parts of chitosan, 5-10 parts of sodium alginate, 1-5 parts of a cross-linking agent and 1-5 parts of a blocking agent, and the blocking agent is formed by mixing nano-silver, nano-cellulose and EVOH resin. The food packaging box has the advantages that the food packaging box good in barrier property can be provided, meanwhile, during preparation, the food packaging box is rapidly cooled after being heated through hot-pressing equipment, and the strength of the packaging box is improved.

Description

Technical Field

[0001] The invention relates to the field of food packaging, and in particular to a food packaging box made of bio-based materials and a preparation method thereof. Background Art

[0002] Food packaging boxes are widely used in the food industry. They not only protect food and extend shelf life, but also enhance the market competitiveness of products. Among them, environmentally friendly packaging materials made of bio-based polymers have attracted more and more people's interest. The application of this type of packaging can effectively solve the environmental problems caused by petroleum-based plastic packaging and meet consumers' increasing environmental protection needs.

[0003] However, when the prior art uses bio-based materials to make packaging boxes, their barrier properties are poor, and water and air leakage is likely to occur, affecting the food preservation effect. Based on this, the present invention designs a bio-based material food packaging box and a preparation method thereof. Summary of the invention

[0004] The purpose of the present invention is to solve the problems in the prior art and to propose a food packaging box made of bio-based materials.

[0005] A bio-based food packaging box comprises a box body, wherein the box body comprises the following components in parts by weight: 35-46 parts of straw, 10-25 parts of bagasse, 3-8 parts of antibacterial solvent, 6-8 parts of chitosan, 5-10 parts of sodium alginate, 1-5 parts of cross-linking agent, and 1-5 parts of barrier agent.

[0006] In the above-mentioned bio-based food packaging box, the straw is a mixture of one or more of corn straw, wheat straw and rice straw.

[0007] In the above-mentioned bio-based food packaging box, the barrier agent is a mixture of nano-silver, nano-cellulose and EVOH resin.

[0008] Also disclosed is a method for preparing the above-mentioned bio-based food packaging box, comprising the following steps:

[0009] S1: After the straw and bagasse are mixed, they are added into a pulverizer for pulverization, and then subjected to alkali treatment, and the material is filtered out and then soaked in water for 10 to 30 minutes. After the soaking is completed, the material is filtered out, and then the filtered material is washed with distilled water until the pH of the washing liquid after washing is neutral, and then the washed material is dried;

[0010] S2: After the dried material is stirred and mixed evenly with sodium alginate and chitosan, a cross-linking agent and an antioxidant are added in sequence and the mixture is continued to be mixed for 15 to 30 minutes. During the mixing process, water is added at a solid-liquid ratio of 10 to 15 g / ml to mix the mixture into a paste-like material, and a barrier agent is added at the same time;

[0011] S3: adding the paste material to the hot pressing molding device 1 to perform hot pressing molding into the desired lunch box main body shape. After the hot pressing is completed, the lunch box main body is quickly cooled to room temperature and then demolded to form a food box;

[0012] The hot pressing forming equipment includes a hot pressing plate and a hydraulic cylinder, wherein the hot pressing plate cooperates with the interior of the food box, a base is arranged below the hot pressing plate, a rapid heat dissipation component is arranged in the base, and the rapid heat dissipation component rapidly cools the food box body;

[0013] The rapid heat dissipation component includes a cavity opened inside the base, a liquid spraying pipe is arranged in the cavity, the liquid spraying pipe is connected to a rotating disk, the rotating disk is fixedly connected to a driving motor, the output shaft of the driving motor is fixedly connected to the rotation center of the rotating disk, the liquid spraying pipe is located at the outer edge of the rotating disk, the rotating disk is connected to a heat dissipation blade via a rotating shaft, and the rotating shaft is connected to a speed reduction component;

[0014] The reduction assembly includes a reduction gear 1 connected to the rotating shaft, the reduction gear 1 is meshed with a reduction gear 2, the reduction gear 2 is coaxially connected to a reduction gear 3 through a connecting shaft, the reduction gear 3 is meshed with a reduction gear 4, the reduction gear 4 is coaxially arranged with the reduction gear, and the top of the reduction gear 4 is coaxially fixedly connected to the bottom of the rotating disk through a sleeve.

[0015] In the above-mentioned method for preparing a food packaging box made of bio-based materials, in step S2, the rotation speed during stirring and mixing is 1000-1500 rpm.

[0016] In the above-mentioned method for preparing a food packaging box made of bio-based materials, in step S3, the hot pressing temperature is 100 to 115° C., and the hot pressing time is 20 to 30 minutes.

[0017] In the above-mentioned method for preparing a food packaging box made of bio-based materials, in step S1, the washing time of distilled water is 0.5 to 1 hour.

[0018] Compared with the existing technology, the advantages of the present invention are: the packaging box is made of bio-based materials, which has the advantages of being green and environmentally friendly, and the barrier effect of the packaging box is improved by using a barrier agent. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1This is a schematic structural diagram of a hot pressing molding device in a method for preparing a bio-based food packaging box proposed in the present invention.

[0020] Figure 2 for Figure 1 Enlarged schematic diagram of part A.

[0021] In the figure: 1 hot pressing forming equipment, 101 hot pressing plate, 102 hydraulic cylinder, 103 base, 2 rapid heat dissipation component, 21 cavity, 22 spray pipe, 23 rotating disk, 24 driving motor, 25 rotating shaft, 26 heat dissipation blade, 3 reduction assembly, 31 reduction gear 1, 32 reduction gear 2, 33 reduction gear 3, 34 reduction gear 4, 35 connecting shaft, 36 sleeve. DETAILED DESCRIPTION

[0022] A bio-based food packaging box comprises a box body, which comprises the following components in parts by weight: 35-46 parts of straw, 10-25 parts of bagasse, 3-8 parts of antibacterial solvent, 6-8 parts of chitosan, 5-10 parts of sodium alginate, 1-5 parts of cross-linking agent and 1-5 parts of barrier agent.

[0023] The straw is a mixture of one or more of corn straw, wheat straw and rice straw.

[0024] The barrier agent is a mixture of nano-silver, nano-cellulose and EVOH resin.

[0025] The following steps are involved:

[0026] S1: After mixing straw and bagasse, add them into a pulverizer for pulverization, then perform alkali treatment, filter out the material and soak it in water for 10 to 30 minutes. After soaking, filter out the material, and then use distilled water to wash the filtered material until the pH of the washing liquid is neutral, and then dry the washed material. In step S1, the washing time of distilled water is 0.5 to 1 hour;

[0027] S2: After the dried material is stirred and mixed evenly with sodium alginate and chitosan, a cross-linking agent and an antioxidant are added in sequence and the mixture is continued to be mixed for 15 to 30 minutes. During the mixing process, water is added at a solid-liquid ratio of 10 to 15 g / ml to mix the mixture into a paste-like material, and a barrier agent is added at the same time. In step S2, the rotation speed during stirring and mixing is 1000 to 1500 rpm;

[0028] S3: adding the above-mentioned paste material into the hot pressing forming device 1 for hot pressing forming into the required lunch box main body shape. After the hot pressing is completed, the lunch box main body is quickly cooled to room temperature and then demolded to form a food box. In step S3, the hot pressing temperature is 100-115° C. and the hot pressing time is 20-30 minutes;

[0029] refer to Figures 1-2 , wherein the hot pressing forming device 1 includes a hot pressing plate 101 and a hydraulic cylinder 102, the hot pressing plate 101 cooperates with the interior of the food box, a base 103 is arranged below the hot pressing plate 101, a rapid heat dissipation component 2 is arranged in the base 103, and the rapid heat dissipation component 2 quickly cools the food box body;

[0030] The rapid heat dissipation component 2 includes a cavity 21 opened inside the base 103, wherein cooling water is stored in the cavity 21, and a plurality of liquid spraying pipes 22 are arranged in the cavity 21, wherein the liquid spraying pipes 22 extend out of the water surface, and the liquid spraying pipes 22 can absorb the cooling water in the cavity 21 and spray it upward, and the liquid spraying pipes 22 are connected to a rotating disk 23, and the rotating disk 23 is fixedly connected to a driving motor 24, and the output shaft of the driving motor 24 is fixedly connected to the rotation center of the rotating disk 23, and the plurality of liquid spraying pipes 22 are arranged in an annular manner at the outer edge of the rotating disk 23, so that the liquid spraying pipes 22 will realize the effect of rotating spraying, and improve the spraying range of the cooling water, and the rotating disk 23 is connected to a heat dissipation blade 26 through a rotating shaft 25, and the rotating shaft 25 is connected to a speed reduction component 3, and the function of the speed reduction component 3 is to reduce the rotation speed of the rotating disk 23, thereby prolonging the local action time of the liquid spraying pipe 22 on the top of the cavity 21, and improving the cooling effect;

[0031] The reduction assembly 3 includes a reduction gear 1 31 connected to the rotating shaft 25, the reduction gear 1 31 is meshed with a reduction gear 2 32, the reduction gear 2 32 is coaxially connected to a reduction gear 3 33 through a connecting shaft 35, the reduction gear 3 33 is meshed with a reduction gear 4 34, the reduction gear 4 34 is coaxially arranged with the reduction gear 1 31, and the top of the reduction gear 4 34 is coaxially fixedly connected to the bottom of the rotating disk 23 through a sleeve 36. During the use of the hot pressing forming equipment 1, the hydraulic cylinder 102 drives the hot pressing plate 101 to move downward, and the paste material is hot-pressed into the shape of the lunch box body through the hot pressing effect of the hot pressing plate 101, and then the hot pressing plate 101 moves upward, and the lunch box body is quickly cooled down through the joint action of multiple injection pipes 22 in the rapid heat dissipation assembly 2.

[0032] It is known from common technical knowledge that the present invention can be implemented by other embodiments that do not deviate from its spirit or essential features. Therefore, the above disclosed embodiments are only illustrative in all respects and are not exclusive. All changes within the scope of the present invention or within the scope equivalent to the present invention are included in the present invention.

Claims

1. A bio-based food packaging box, characterized by: The box body comprises the following components in parts by weight: 35-46 parts of straw, 10-25 parts of bagasse, 3-8 parts of antibacterial solvent, 6-8 parts of chitosan, 5-10 parts of sodium alginate, 1-5 parts of cross-linking agent and 1-5 parts of barrier agent.

2. The bio-based green environmental protection packaging box according to claim 1, characterized in that: The straw is a mixture of one or more of corn straw, wheat straw and rice straw.

3. The production process of a bio-based green environmentally friendly packaging box according to claim 1, characterized in that: The barrier agent is prepared by mixing nano silver, nano cellulose and EVOH resin.

4. The method for preparing a bio-based green environmentally friendly packaging box according to any one of claims 1 to 3, characterized in that: The following steps are involved: S1: After the straw and bagasse are mixed, they are added into a pulverizer for pulverization, and then subjected to alkali treatment, and the material is filtered out and then soaked in water for 10 to 30 minutes. After the soaking is completed, the material is filtered out, and then the filtered material is washed with distilled water until the pH of the washing liquid after washing is neutral, and then the washed material is dried; S2: After the dried material is stirred and mixed evenly with sodium alginate and chitosan, a cross-linking agent and an antioxidant are added in sequence and the mixture is continued to be mixed for 15 to 30 minutes. During the mixing process, water is added at a solid-liquid ratio of 10 to 15 g / ml to mix the mixture into a paste-like material, and a barrier agent is added at the same time; S3: adding the paste material to the hot pressing molding device 1 to perform hot pressing molding into the desired lunch box main body shape. After the hot pressing is completed, the lunch box main body is quickly cooled to room temperature and then demolded to form a food box; The hot pressing forming device (1) comprises a hot pressing plate (101) and a hydraulic cylinder (102), wherein the hot pressing plate (101) cooperates with the interior of the food box, a base (103) is arranged below the hot pressing plate (101), a rapid heat dissipation component (2) is arranged in the base (103), and the rapid heat dissipation component (2) is used to rapidly cool the food box body; The rapid heat dissipation component (2) comprises a cavity (21) opened inside the base (103), a liquid spraying pipe (22) is arranged in the cavity (21), the liquid spraying pipe (22) is connected to a rotating disk (23), the rotating disk (23) is fixedly connected to a driving motor (24), the output shaft of the driving motor (24) is fixedly connected to the rotation center of the rotating disk (23), the liquid spraying pipe (22) is located at the outer edge of the rotating disk (23), the rotating disk (23) is connected to a heat dissipation blade (26) via a rotating shaft (25), and the rotating shaft (25) is connected to a speed reduction component (3); The reduction assembly (3) comprises a reduction gear 1 (31) connected to the rotating shaft (25), the reduction gear 1 (31) meshing with a reduction gear 2 (32), the reduction gear 2 (32) being coaxially connected with a reduction gear 3 (33) via a connecting shaft (35), the reduction gear 3 (33) being meshing with a reduction gear 4 (34), the reduction gear 4 (34) being coaxially arranged with the reduction gear 1 (31), and the top of the reduction gear 4 (34) being coaxially fixedly connected with the bottom of the rotating disk (23) via a sleeve (36).

5. The method for preparing a bio-based green environmentally friendly packaging box according to claim 4, characterized in that: In step S2, the rotation speed during stirring and mixing is 1000 to 1500 rpm.

6. The method for preparing a bio-based green environmentally friendly packaging box according to claim 4, characterized in that: In step S3, the hot pressing temperature is 100-115° C., and the hot pressing time is 20-30 minutes.

7. The method for preparing a bio-based green environmentally friendly packaging box according to claim 4, characterized in that: In step S1, the washing time of distilled water is 0.5 to 1 hour.

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