Bamboo-based degradable fruit and vegetable bag and preparation method thereof

Abstract

The invention discloses a bamboo-based degradable fruit and vegetable bag and a preparation method thereof, the bamboo-based degradable fruit and vegetable bag comprises the following raw materials by weight: 80%-90% of bamboo pulp, 2%-4% of AKD, 0.05%-1% of a wet strength agent, 5%-10% of bamboo charcoal powder, 1%-2% of a color fixing agent and 0.5%-1.5% of a dispersant, and the invention relates to the technical field of food bag processing. According to the bamboo-based degradable fruit and vegetable bag and the preparation method thereof, commercial bamboo pulp boards are used as raw materials, the process is adjusted, auxiliaries are added, and double-net double-cylinder papermaking is performed to prepare the bag paper; meanwhile, resin is molten and coated on the surface of the bagging paper, so that a thin lamination layer is formed; and finally, the bamboo-based degradable fruit and vegetable bag is prepared through cutting, gluing and forming of a paper bag forming machine.

Description

Technical Field

[0001] The invention relates to the technical field of food bag processing, in particular to a bamboo-based degradable fruit and vegetable bag and a preparation method thereof. Background Art

[0002] Fruit and vegetable bagging is a technology that uses special materials to wrap fruits and vegetables during their growth. It can reduce pesticide residues, protect fruits and vegetables from pests and diseases, wind, rain, sunlight and other natural factors, and at the same time regulate the growth environment of fruits and vegetables, promote the improvement of fruit and vegetable quality, increase fruit and vegetable production, and significantly increase the income of producers. With the vigorous development of the domestic economy and the improvement of people's living standards, the demand for fruits and vegetables is increasing, and the entire fruit and vegetable bagging market has a broad prospect.

[0003] At present, there are three common types of fruit and vegetable bags: plastic bags, non-woven bags, and paper bags. Plastic bags are moisture-proof, dust-proof, and insect-proof, while non-woven bags have good air permeability, good heat preservation, and high strength. However, they are difficult to degrade and have high recycling costs. If they are not handled properly, they will cause harm to the environment. Paper bags are low in cost, have good air permeability, and are easy to degrade. They are an environmentally friendly fruit bag, but they also have disadvantages such as poor water resistance and low strength.

[0004] Bamboo has a short growth cycle, excellent mechanical properties, and can be planted once and used sustainably. Bamboo fiber is a medium-long fiber, with a length between coniferous wood and broad-leaved wood, and is one of the better non-wood fiber raw materials for papermaking. At the same time, my country's bamboo species, area and stock volume are among the highest in the world. It is of great significance to give full play to the advantages of bamboo resources and increase the added value of bamboo utilization. Summary of the invention

[0005] 1. Technical issues to be resolved In view of the shortcomings of the prior art, the present invention provides a bamboo-based degradable fruit and vegetable bag and a preparation method thereof. The bagging paper is prepared by adjusting the process, adding additives, and double-net and double-cylinder papermaking using commercial bamboo pulp board as raw material; at the same time, the resin is melt-coated on the surface of the bagging paper to form a thin coating layer; finally, the bamboo-based degradable fruit and vegetable bag is cut, glued, and formed by a paper bag forming machine.

[0006] (II) Technical solution To achieve the above purpose, the present invention is implemented through the following technical scheme: a bamboo-based degradable fruit and vegetable bag, whose raw materials include, by weight percentage: 80%-90% bamboo pulp, 2%-4% AKD, 0.05%-1% wet strength agent, 5%-10% bamboo charcoal powder, 1%-2% color fixative and 0.5%-1.5% dispersant.

[0007] Preferably, the raw materials include, by weight percentage: 85% bamboo pulp, 3% AKD, 0.5% wet strength agent, 9% bamboo charcoal powder, 1.5% color fixing agent and 1% dispersant.

[0008] Preferably, the raw materials include, by weight percentage: 89.45% bamboo pulp, 2% AKD, 0.05% wet strength agent, 7% bamboo charcoal powder, 1% color fixative and 0.5% dispersant.

[0009] Preferably, the raw materials include, by weight percentage: 81.5% bamboo pulp, 4% AKD, 1% wet strength agent, 10% bamboo charcoal powder, 2% color fixative and 1.5% dispersant.

[0010] Preferably, the wet strength agent is PAE.

[0011] Preferably, the color fixing agent is one of cetylpyridinium chloride or cetylpyridinium bromide.

[0012] Preferably, the dispersant is one of polyethylene, polyvinyl alcohol or polyoxyethylene alkylphenol ether.

[0013] The present invention also provides a method for preparing a bamboo-based degradable fruit and vegetable bag, which specifically comprises the following steps: S1. Beating: After the bamboo pulp is treated, it is poured into the pulping machine with a grinding plate pressure of 2.0 MPa to keep the beating degree at 30°SR. PAE is used as a wet strength agent. The resin can form a network structure that can wrap the fiber and cannot be hydrolyzed. This can greatly reduce the interaction between water and fiber and effectively improve the wet strength of the paper bag. S2. Add 400 mesh bamboo charcoal powder during pulping to fully combine it with the fiber, and make the surface of the finished paper smooth and delicate. Dissolve the fixing agent and dispersant in 40°C hot water, then add them to the bamboo charcoal powder, adjust the concentration to 10%, heat to 80°C, stir and disperse, and add it to the pulp after swelling treatment. This can make the paper bag have excellent light-shielding properties; S3, papermaking: using a papermaking machine to paper the treated bamboo pulp into paper; S4, drying and forming: the treated pulp is placed on a pneumatic paper former to make paper. The finished paper needs to be squeezed out of excess water on a paper press and air-dried in a dryer for 12 hours; S5, lamination: use the double cylinder and three nets of the rotary paper machine to make paper, and make the inner and outer surfaces of the outer paper bag into the outer paper bag for fruit and vegetable bagging; S6. Use laminating process to coat PLA onto the inner bag of the outer paper bag: Place the prepared outer paper bag with the black side facing upward on the unwinding guide roller of the laminating equipment. The paper bag passes through the corona machine evenly and is treated with corona to make dents appear. Use spraying equipment to laminar the black side of the outer paper bag. Send the laminar paper bag into a hydraulic press to compact the paper bag. Use a cooling machine to cool the compacted paper bag at a cooling temperature of 10-15°C. Reel and store the prepared fruit and vegetable bag.

[0014] (III) Beneficial effects The present invention provides a bamboo-based degradable fruit and vegetable bag and a preparation method thereof. Compared with the prior art, the bamboo-based degradable fruit and vegetable bag and the preparation method thereof have the following beneficial effects: the raw materials of the bamboo-based degradable fruit and vegetable bag and the preparation method thereof include, by weight percentage: 80%-90% bamboo pulp, 2%-4% AKD, 0.05%-1% wet strength agent, 5%-10% bamboo charcoal powder, 1%-2% color fixative and 0.5%-1.5% dispersant, and the bagging paper is prepared by adjusting the process, adding additives, and double-net double-cylinder papermaking with commercial bamboo pulp board as raw material; at the same time, the resin is melt-coated on the surface of the bagging paper to form a thin coating layer; finally, the bamboo-based degradable fruit and vegetable bag is cut, glued and formed by a paper bag forming machine. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 The present invention is a flow chart of the preparation method. DETAILED DESCRIPTION

[0016] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0017] See also Figure 1 The embodiments of the present invention provide four technical solutions: a bamboo-based degradable fruit and vegetable bag and a preparation method thereof, specifically including the following embodiments: Embodiment 1: A bamboo-based degradable fruit and vegetable bag, wherein the raw materials include by weight percentage: 85% bamboo pulp, 3% AKD, 0.5% wet strength agent, 9% bamboo charcoal powder, 1.5% color fixative and 1% dispersant, wherein the wet strength agent is PAE, the color fixative is cetylpyridinium chloride, and the dispersant is polyethylene.

[0018] The embodiment of the present invention also provides a method for preparing a bamboo-based degradable fruit and vegetable bag, which specifically comprises the following steps: S1. Beating: After the bamboo pulp is treated, it is poured into the pulping machine with a grinding plate pressure of 2.0 MPa to keep the beating degree at 30°SR. The polyamide resin PAE is used as a wet strength agent. The resin can form a network structure that can wrap the fiber and cannot be hydrolyzed, which can greatly reduce the interaction between water and fiber and effectively improve the wet strength of the paper bag. S2. Add 400 mesh bamboo charcoal powder during pulping to fully combine it with the fiber, and make the surface of the finished paper smooth and delicate. Dissolve the fixing agent and dispersant in 40°C hot water, then add them to the bamboo charcoal powder, adjust the concentration to 10%, heat to 80°C, stir and disperse, and add it to the pulp after swelling treatment. This can make the paper bag have excellent light-shielding properties; S3, papermaking: using a papermaking machine to paper the treated bamboo pulp into paper; S4, drying and forming: the treated pulp is placed on a pneumatic paper former to make paper. The finished paper needs to be squeezed out of excess water on a paper press and air-dried in a dryer for 12 hours; S5, lamination: use the double cylinder and three nets of the rotary paper machine to make paper, and make the inner and outer surfaces of the outer paper bag into the outer paper bag for fruit and vegetable bagging; S6. Use lamination process to coat PLA onto the inner bag of the outer paper bag: Place the prepared outer paper bag with the black side facing up on the unwinding guide roller of the lamination equipment. Pass the paper bag evenly through the corona machine and perform corona treatment to make it have dents. Use spraying equipment to perform lamination treatment on the black side of the outer paper bag. Send the laminar paper bag into a hydraulic press to compact the paper bag. Use a cooler to cool the compacted paper bag at a cooling temperature of 13°C. Reel and store the prepared fruit and vegetable bag.

[0019] Embodiment 2: A bamboo-based degradable fruit and vegetable bag, whose raw materials include by weight percentage: 89.45% bamboo pulp, 2% AKD, 0.05% wet strength agent, 7% bamboo charcoal powder, 1% color fixing agent and 0.5% dispersant, the wet strength agent is polyamide polyepichlorohydrin resin polyamide resin PAE, the color fixing agent is cetylpyridinium bromide, and the dispersant is polyvinyl alcohol.

[0020] The embodiment of the present invention also provides a method for preparing a bamboo-based degradable fruit and vegetable bag, which specifically comprises the following steps: S1. Beating: After the bamboo pulp is treated, it is poured into the pulping machine with a grinding plate pressure of 2.0 MPa to keep the beating degree at 30°SR. PAE is used as a wet strength agent. The resin can form a network structure that can wrap the fiber and cannot be hydrolyzed. This can greatly reduce the interaction between water and fiber and effectively improve the wet strength of the paper bag. S2. Add 400 mesh bamboo charcoal powder during pulping to make it fully combined with the fiber, and the surface of the finished paper is smooth and delicate. Dissolve the fixing agent and dispersant in 40°C hot water, and then add them to the bamboo charcoal powder. Adjust the concentration to 10%, heat to 80°C, stir and disperse, and add it to the pulp after swelling treatment. This can make the paper bag have excellent light-shielding properties. S3, papermaking: using a papermaking machine to paper the treated bamboo pulp into paper; S4, drying and forming: the treated pulp is placed on a pneumatic paper former to make paper. The finished paper needs to be squeezed out of excess water on a paper press and air-dried in a dryer for 12 hours; S5, lamination: use the double cylinder and three nets of the rotary paper machine to make paper, and make the inner and outer surfaces of the outer paper bag into the outer paper bag for fruit and vegetable bagging; S6. Use laminating process to coat PLA onto the inner bag of the outer paper bag: Place the prepared outer paper bag with the black side facing upward on the unwinding guide roller of the laminating equipment. Pass the paper bag evenly through the corona machine and perform corona treatment to make it have dents. Use spraying equipment to perform laminating treatment on the black side of the outer paper bag. Send the laminating paper bag into a hydraulic press to compact the paper bag. Use a cooling machine to cool the compacted paper bag at a cooling temperature of 10°C. Reel and store the prepared fruit and vegetable bag.

[0021] Example 3: A bamboo-based degradable fruit and vegetable bag, whose raw materials include, by weight percentage: 81.5% bamboo pulp, 4% AKD, 1% wet strength agent, 10% bamboo charcoal powder, 2% color fixing agent and 1.5% dispersant, the wet strength agent is PAE, the color fixing agent is cetylpyridinium chloride, and the dispersant is polyoxyethylene alkylphenol ether.

[0022] The embodiment of the present invention also provides a method for preparing a bamboo-based degradable fruit and vegetable bag, which specifically comprises the following steps: S1. Beating: After bamboo pulp is handled, it is poured into the pulping machine. The grinding plate pressure is 2.0MPa, and the beating degree is maintained at 30°SR. Polyamide resin PAE is used as a wet strength agent. The resin can form a network structure that can wrap the fiber and cannot be hydrolyzed, which can greatly reduce the interaction between water and fiber and effectively improve the wet strength of the paper bag; S2. Add 400 mesh bamboo charcoal powder during pulping to fully combine it with the fiber, and make the surface of the paper smooth and delicate. Dissolve the fixing agent and dispersant in 40°C hot water, then add them to the bamboo charcoal powder, adjust the concentration to 10%, heat to 80°C, stir and disperse, and add it to the pulp after swelling treatment. This can make the paper bag have excellent light-shielding properties. S3, papermaking: using a papermaking machine to paper the treated bamboo pulp into paper; S4, drying and forming: the treated pulp is placed on a pneumatic paper former to make paper. The finished paper needs to be squeezed out of excess water on a paper press and air-dried in a dryer for 12 hours; S5, lamination: use the double cylinder and three nets of the rotary paper machine to make paper, and make the inner and outer surfaces of the outer paper bag into the outer paper bag for fruit and vegetable bagging; S6. Use laminating process to coat PLA onto the inner bag of the outer paper bag: Place the prepared outer paper bag with the black side facing upward on the unwinding guide roller of the laminating equipment. Pass the paper bag evenly through the corona machine and perform corona treatment to make it have dents. Use spraying equipment to perform laminating treatment on the black side of the outer paper bag. Send the laminating paper bag into a hydraulic press to compact the paper bag. Use a cooling machine to cool the compacted paper bag at a cooling temperature of 15°C. Reel and store the prepared fruit and vegetable bag.

[0023] Example 4: A bamboo-based degradable fruit and vegetable bag, whose raw materials include, by weight percentage: 85.1% bamboo pulp, 3% AKD, 0.6% wet strength agent, 9% bamboo charcoal powder, 1.5% color fixing agent and 0.8% dispersant, the wet strength agent is PAE, the color fixing agent is one of cetylpyridinium chloride or cetylpyridinium bromide, and the dispersant is one of polyethylene, polyvinyl alcohol or polyoxyethylene alkylphenol ether.

[0024] The embodiment of the present invention also provides a method for preparing a bamboo-based degradable fruit and vegetable bag, which specifically comprises the following steps: S1. Beating: After bamboo pulp is handled, it is poured into the pulping machine. The grinding plate pressure is 2.0MPa, and the beating degree is maintained at 30°SR. Polyamide resin PAE is used as a wet strength agent. The resin can form a network structure that can wrap the fiber and cannot be hydrolyzed, which can greatly reduce the interaction between water and fiber and effectively improve the wet strength of the paper bag; S2. Add 400 mesh bamboo charcoal powder during pulping to fully combine it with the fiber, and make the surface of the paper smooth and delicate. Dissolve the fixing agent and dispersant in 40°C hot water, then add them to the bamboo charcoal powder, adjust the concentration to 10%, heat to 80°C, stir and disperse, and add it to the pulp after swelling treatment. This can make the paper bag have excellent light-shielding properties. S3, papermaking: using a papermaking machine to paper the treated bamboo pulp into paper; S4, drying and forming: the treated pulp is placed on a pneumatic paper former to make paper. The finished paper needs to be squeezed out of excess water on a paper press and air-dried in a dryer for 12 hours; S5, lamination: use the double cylinder and three nets of the rotary paper machine to make paper, and make the inner and outer surfaces of the outer paper bag into the outer paper bag for fruit and vegetable bagging; S6. Use lamination process to coat PLA onto the inner bag of the outer paper bag: Place the prepared outer paper bag with the black side facing up on the unwinding guide roller of the lamination equipment. Pass the paper bag evenly through the corona machine and perform corona treatment to make it have dents. Use spraying equipment to perform lamination treatment on the black side of the outer paper bag. Send the laminar paper bag into a hydraulic press to compact the paper bag. Use a cooler to cool the compacted paper bag at a cooling temperature of 12°C. Reel and store the prepared fruit and vegetable bag.

[0025] In summary, the present invention uses commercial bamboo pulp board as raw material, adjusts the process, adds additives, and prepares bagging paper by double-net double-cylinder papermaking; at the same time, the resin is melt-coated on the surface of the bagging paper to form a thin coating layer; finally, the bamboo-based degradable fruit and vegetable bag is prepared by cutting, gluing and molding through a paper bag forming machine.

[0026] Meanwhile, the contents not described in detail in this specification belong to the prior art known to those skilled in the art.

[0027] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0028] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A bamboo-based degradable fruit and vegetable bag, characterized in that: The raw materials include, by weight percentage: bamboo pulp 80%-90%, AKD 2%-4%, wet strength agent 0.05%-1%, bamboo charcoal powder 5%-10%, color fixing agent 1%-2% and dispersant 0.5%-1.5%.

2. The bamboo-based degradable fruit and vegetable bag according to claim 1, characterized in that: The raw materials include by weight percentage: bamboo pulp 85%, AKD 3%, wet strength agent 0.5%, bamboo charcoal powder 9%, color fixing agent 1.5% and dispersant 1%.

3. The bamboo-based degradable fruit and vegetable bag according to claim 1, characterized in that: The raw materials include, by weight percentage, 89.45% bamboo pulp, 2% AKD, 0.05% wet strength agent, 7% bamboo charcoal powder, 1% color fixing agent and 0.5% dispersant.

4. The bamboo-based degradable fruit and vegetable bag according to claim 1, characterized in that: The raw materials include, by weight percentage, 81.5% bamboo pulp, 4% AKD, 1% wet strength agent, 10% bamboo charcoal powder, 2% color fixing agent and 1.5% dispersant.

5. A bamboo-based degradable fruit and vegetable bag according to any one of claims 1 to 4, characterized in that: The wet strength agent is polyamide polyepichlorohydrin resin (PAE).

6. A bamboo-based degradable fruit and vegetable bag according to any one of claims 1 to 4, characterized in that: The color fixing agent is one of cetylpyridinium chloride or cetylpyridinium bromide.

7. A bamboo-based degradable fruit and vegetable bag according to any one of claims 1 to 4, characterized in that: The dispersant is one of polyethylene, polyvinyl alcohol or polyoxyethylene alkylphenol ether.

8. A method for preparing the bamboo-based degradable fruit and vegetable bag according to any one of claims 1 to 4, characterized in that: The specific steps include: S1. Beating: After the bamboo pulp is treated, it is poured into the pulping machine with a grinding plate pressure of 2.0 MPa to keep the beating degree at 30°SR. PAE is used as a wet strength agent. The resin can form a network structure that can wrap the fiber and cannot be hydrolyzed. This can greatly reduce the interaction between water and fiber and effectively improve the wet strength of the paper bag. S2. Add 400 mesh bamboo charcoal powder during pulping to fully combine it with the fiber, and make the surface of the paper smooth and delicate. First, dissolve the fixing agent and dispersant in 40°C hot water, then add them to the bamboo charcoal powder and adjust the concentration to 10%. Then heat it to 80°C and stir and disperse it. After swelling treatment, add it to the pulp by metering. This can make the paper bag have excellent light-shielding properties. S3, papermaking: using a papermaking machine to paper the treated bamboo pulp into paper; S4, drying and forming: the treated pulp is placed on a pneumatic paper former to make paper. The finished paper needs to be squeezed out of excess water on a paper press and air-dried in a dryer for 12 hours; S5, lamination: use the double cylinder and three nets of the rotary paper machine to make the outer paper bag of the fruit and vegetable bag by making the inner and outer surfaces of the outer paper bag; S6. Use the laminating process to coat polylactic acid (PLA) onto the inner bag of the outer paper bag: Place the prepared outer paper bag with the black side facing up on the unwinding guide roller of the laminating equipment. The paper bag passes through the corona machine evenly and is treated with corona to make dents appear. Use the spraying equipment to laminar the black side of the outer paper bag. Send the laminar paper bag into the hydraulic press to compact the paper bag. Use the cooling machine to cool the compacted paper bag at a cooling temperature of 10-15°C. Reel and store the prepared fruit and vegetable bag.

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