Degradable paper pulp packaging product suitable for tomato transportation and storage and preparation method of degradable paper pulp packaging product

Abstract

The invention discloses a degradable paper pulp packaging product suitable for tomato transportation and storage and a preparation method thereof.The method comprises the following steps that S1, functional auxiliaries are added into pulp and stirred and mixed, then modified polyamide-epichlorohydrin resin is added, bagasse is added and stirred and mixed, uniform stirring is performed, the pulp is mixed, and a mixture is obtained; the modified polyamide-epichlorohydrin resin is prepared by mixing polyamide-epichlorohydrin resin and cationic starch; s2, the mixed slurry is subjected to vacuum adsorption, dehydration and forming, and a wet blank is obtained; s3, the wet blank is heated, dried and shaped, and a packaged semi-finished product is obtained; s4, sterilizing the packaged semi-finished product prepared in the step S3 to obtain a bagasse paper pulp packaged crude product; and S5, the packaging crude product prepared in the step S4 is subjected to a film coating procedure, an antibacterial coating is coated, and the bagasse paper pulp packaging product suitable for tomato packaging is obtained.

Description

Technical Field

[0001] The present invention belongs to the technical field of packaging boxes. Specifically, it relates to a degradable pulp packaging product suitable for the transportation, storage, and sales of tomatoes, and a preparation method thereof. Background Art

[0002] Tomatoes are rich in carotenoids, lycopene, various vitamins, and mineral elements such as potassium, calcium, and selenium, and are extremely nutritious, deeply loved by consumers, widely cultivated worldwide, and have a huge consumption volume. Tomatoes have a sweet and sour taste and high nutritional content, but they are highly regional. After harvesting, the changes in their physiological and biochemical indicators are closely related to storage conditions and time. During storage, the fruit quality deteriorates from good to bad until it loses its edible value. During transportation, it is easily damaged by mechanical damage and invaded by microorganisms. Therefore, the packaging requirements during transportation and storage are extremely strict. Therefore, the development of efficient and safe storage and preservation technologies is of great significance for reducing post-harvest losses of tomatoes. In daily life, plastics are widely used for tomato packaging. After use, these plastics become waste, not only polluting the environment, but also the microplastics decomposed from them have biological toxicity and accumulation, and can migrate to higher trophic levels through the food chain, and even transfer to the human body, seriously endangering human health. Therefore, it is urgent to develop environmentally friendly and biodegradable green packaging materials to replace plastics. Now, using bagasse as the main packaging raw material, making full use of natural resources, turning waste into treasure, it can be degraded and pollution-free after being discarded, renewable and low-cost, which is conducive to sustainable development. Summary of the Invention

[0003] Aiming at the problems existing in the existing tomato packaging products, the present invention provides a degradable packaging product and a preparation method thereof. This product is not only green and environmentally friendly, provides physical protection for tomatoes, but also can effectively inhibit the growth of pathogenic microorganisms, delay the spoilage of tomatoes, and extend the storage period of tomatoes.

[0004] The technical solution provided by the present invention is as follows:

[0005] The invention provides a preparation method of a degradable pulp packaging product suitable for the transportation and storage of tomatoes, including the following steps:

[0006] S1: Add functional additives to the pulp, stir and mix, then add modified polyamide-epichlorohydrin resin, stir and mix, add bagasse, stir evenly to obtain a mixed pulp. The modified polyamide-epichlorohydrin resin is made by mixing polyamide-epichlorohydrin resin with modified cationic starch;

[0007] S2: Vacuum adsorb and dehydrate the mixed pulp to form a wet blank;

[0008] S3: Heat and dry the wet blank to shape it to obtain a semi-finished packaging product;

[0009] S4: Sterilize the semi-finished packaging product prepared in step S3 to obtain the crude bagasse pulp packaging product.

[0010] S5: Perform a coating process on the crude packaging product prepared in step S4, apply an antibacterial coating, and obtain a degradable pulp packaging product suitable for tomato transportation and storage.

[0011] Furthermore, the modified polyamide-epichlorohydrin resin is prepared by the following method: directly add cationic starch to the polyamide-epichlorohydrin resin in a ratio of 10:6 and mix evenly. Selecting cationic starch is convenient for binding with the polyamide-epichlorohydrin resin. To increase the waterproofness, oil resistance, etc. of the bagasse pulp packaging material, the selection range of functional additives can also be expanded.

[0012] Furthermore, the raw material components in step S1) are 1500 parts by weight of pulp, 10 - 20 parts by weight of bagasse, 5 - 7 parts by weight of cationic modified starch, 10 - 14 parts by weight of polyamide-epichlorohydrin resin, and 2 - 4 parts by weight of functional additives.

[0013] Furthermore, the preparation method of the pulp is to stir and mix plant fibers and recycled waste paper, crush them to obtain particulate matter, then add water and a retention aid to the particulate matter, stir and mix, pulp, and beat to obtain the pulp. The weight ratio of the materials is: 1500 parts of water, 35 - 45 parts of plant fibers, 30 - 40 parts of recycled waste paper, and 2 - 4 parts of retention aid; the beating speed is 1200r or 1300r.

[0014] Optionally, the pulp is mainly made of the following raw materials in parts by weight: 1500 parts of water, 40 parts of plant fibers, 35 parts of recycled waste corrugated cardboard, and 3 parts of retention aid. It can also be adjusted as needed to: 1500 parts of water, 35 parts of plant fibers, 30 parts of recycled waste paper, and 2 parts of retention aid; or, 1500 parts of water, 45 parts of plant fibers, 40 parts of recycled waste paper, and 4 parts of retention aid, etc.

[0015] Optionally, the plant fibers are rice straw and corn cob, and the weight ratio of rice straw to corn cob is 1:(0.2 - 0.4).

[0016] Optionally, the retention aid is polyacrylamide; the recycled waste paper is recycled waste corrugated cardboard.

[0017] Furthermore, the average particle size of the bagasse is 2 - 12μm. Preferably, the average particle size of the bagasse is 3 - 6μm. In one embodiment, the average particle size of the bagasse is 6μm, and it can be adjusted to 2μm, 4μm, 6μm, 8μm, 10μm, etc. according to needs.

[0018] Furthermore, the structure of the packaged product includes a box body with an open upper end. A sealing edge that folds outward is provided at the opening of the box body. Ventilation holes are provided at the bottom of the box body. A buffer band is provided on the side wall of the box body. Buffer cushion corners are provided at the four corners of the bottom of the box body.

[0019] Furthermore, the buffer cushion corners are circular or arc-shaped protrusions extending towards the inside of the box body; the buffer band is a cylindrical protrusion extending towards the inside of the box body; the ventilation holes are multiple ventilation holes in circular, square, or irregular shapes, and the edges of the ventilation holes are smooth.

[0020] Furthermore, the specific steps of the coating process are as follows: Use a brush adapted to the packaged product to apply 2,3-butanedione antibacterial coating solution and / or β-ionone antibacterial coating solution to the inner surface of the packaged product. The antibacterial coating is a 2,3-butanedione antibacterial coating and / or a β-ionone antibacterial coating.

[0021] The brush includes a water-absorbing sponge and a handle. The shape of the water-absorbing sponge is adapted to the size of the accommodating cavity inside the box body. When the brush is placed inside the box body, the outer surface of the water-absorbing sponge contacts the inner surface of the box body.

[0022] As a solution of the present invention, it is possible to first evenly apply β-ionone microcapsule antibacterial coating solution on the inner surface of the packaging box with an adapted brush, air-dry it at room temperature, and then evenly apply 2,3-butanedione antibacterial coating solution with a brush to obtain the antibacterial coating.

[0023] Furthermore, the preparation method of the 2,3-butanedione antibacterial coating solution is as follows: Take β-cyclodextrin and dissolve and disperse it by ultrasonic oscillation. Add 2,3-butanedione (g) and Tween-80, and perform ultrasonic oscillation. Let it stand, and under water bath stirring, add carboxymethyl chitosan and fully stir to dissolve to prepare the 2,3-butanedione antibacterial coating solution.

[0024] Specifically, it can be: Take β-cyclodextrin and dissolve and disperse it by ultrasonic oscillation at 60°C and a frequency of 40 kHz. Add different amounts of 2,3-butanedione (g) and Tween-80, perform ultrasonic oscillation at 60°C for 80 min, and let it stand for 24 h. Under water bath stirring at 45°C, add carboxymethyl chitosan and fully stir to dissolve to prepare 2,3-butanedione antibacterial coating solutions with mass fractions of 0.5 (W / V)% and 1.0%.

[0025] Further, the preparation method of the β-ionone antibacterial coating solution is as follows: Weigh chitosan and dissolve it in an acetic acid solution, add the plasticizer glycerol, and stir for h to prepare a chitosan coating solution, which is cooled to room temperature for standby; Dissolve β-cyclodextrin in distilled water to form a β-cyclodextrin supersaturated solution; Dissolve the β-ionone antibacterial agent in absolute ethanol, and gradually add the solution dropwise to the saturated aqueous solution of β-cyclodextrin. Add Tween-80 emulsifier, and after dispersion, the mixed solution is stirred at a certain temperature for a certain time and then taken out. Wait for the solution to cool to, stand still, solidify, and filter under reduced pressure. The obtained filter residue is washed with absolute ethanol to remove the unencapsulated antibacterial agent, and washed with distilled water to remove the excess β-cyclodextrin to obtain wet microcapsules; The wet microcapsules are dried to a constant weight to obtain dry β-ionone antibacterial agent microcapsules; Add the plasticizer glycerol and β-ionone antibacterial agent microcapsules to the chitosan coating solution and stir until they are fully mixed to obtain the β-ionone microcapsule antibacterial coating solution.

[0026] Specifically, it can be: Weigh chitosan and dissolve it in an acetic acid solution (1% V / V), heat and stir in a 60°C water bath to make it fully dissolve; Add the plasticizer glycerol (1% V / V), and continue to stir at 60°C for 1 h to prepare a chitosan coating solution with a mass fraction of 2.0 (W / V)%, which is cooled to room temperature for standby. Then accurately weigh β-cyclodextrin and dissolve it in distilled water in a 60°C water bath to form a β-cyclodextrin supersaturated solution. Weigh different amounts of β-ionone antibacterial agent, dissolve it in absolute ethanol (1 mg / ml), and gradually add the solution dropwise to the saturated aqueous solution of β-cyclodextrin. Add Tween-80 emulsifier, disperse for 20 min, then the mixed solution is stirred at a certain temperature for a certain time and then taken out. After the solution is cooled to room temperature, it is left to stand in a 4°C refrigerator to solidify for 24 h, and filtered under reduced pressure with a vacuum pump. The obtained filter residue is washed with absolute ethanol to remove the unencapsulated antibacterial agent (washed 3 times), and washed with distilled water to remove the excess β-cyclodextrin (washed 3 times) to obtain wet microcapsules. Place the wet microcapsules on a watch glass and dry them to a constant weight in a 50°C oven to obtain dry microcapsules (β-ionone antibacterial agent microcapsule products). Add the plasticizer glycerol (1% V / V) and β-ionone antibacterial agent microcapsules (the addition amounts are 0.5% (W / V) and 1.0% respectively) to the chitosan coating solution, and continue to stir at 60°C for 1 h to make them fully mixed to obtain 2 groups of β-ionone microcapsule antibacterial coating solutions with different concentrations, which are cooled to room temperature for standby.

[0027] Further, the packaging product further includes a sealing film used in combination with the box body, and the sealing film is connected to the sealing edge; Preferably, the sealing film is a PE film, and there are many micro pores on the PE film.

[0028] The present invention also claims to protect the packaging product prepared by the described preparation method, including: a box body, a hollow cavity with an open upper end of the box body, a sealing edge that is folded outward at the opening of the box body, ventilation holes provided at the bottom of the box body, and a buffer band on the side wall of the box body.

[0029] Among them, the box body is a cuboid cavity, and buffer cushion corners are provided at the four corners of the bottom of the box body.

[0030] Among them, the buffer cushion corner is a circular or arc-shaped protrusion extending towards the inside of the box body.

[0031] Among them, the buffer band is a cylindrical protrusion extending towards the inside of the box body.

[0032] Among them, the box body is a multi-layer structure, which sequentially includes a degradable paper layer and a β-ionone antibacterial layer from outside to inside.

[0033] Among them, a 2,3-butanedione antibacterial layer is further provided in the β-ionone antibacterial layer.

[0034] Among them, the ventilation holes are multiple ventilation holes in circular, square or irregular shapes, and the edges of the ventilation holes are smooth.

[0035] Among them, it further includes a sealing film, and the sealing film is connected to the sealing edge.

[0036] Among them, the sealing film is a PE film, and there are many micro air holes on the PE film.

[0037] Among them, the degradable paper layer is made of degradable pulp. Preferably, the degradable pulp is bagasse pulp, which specifically includes 1500 parts by weight of pulp, 10 - 20 parts by weight of bagasse, 5 - 7 parts by weight of cationic modified starch, 10 - 14 parts by weight of polyamide-epichlorohydrin resin, and 2 - 4 parts by weight of functional additives.

[0038] As a size specification of the present invention, it includes but is not limited to the following sizes: the length of the upper bottom of the box body is 16 cm, the length of the lower bottom is 13 cm, the width of the upper bottom is 12 cm, the width of the lower bottom is 9 cm, and the height is 7 cm; the width of the sealing edge at the top of the box body is 0.8 cm, the inner diameter of the buffer cushion corner is 1.5 cm, and the height is 0.8 cm; the length of the buffer protection band around the box body is 7 cm, the width is 2 cm, the length of the buffer protection band inside the box bottom is 2 cm, and the width is 2 cm; the inner diameter of the circular ventilation hole is 0.6 cm, and the length is 0.6 cm.

[0039] The waste materials after the production and processing of sugarcane are sugarcane bagasse, which can be used as the material for sugarcane bagasse pulp packaging. The sugarcane bagasse pulp packaging is used for the packaging requirements of tomato storage, transportation, sales, etc., realizing the recycling of sugarcane bagasse, turning waste into treasure, saving resources, being green and environmentally friendly, being conducive to sustainable production development, and improving the utilization rate of agricultural products.

[0040] On this basis, in the raw materials of the packaging box of the present invention, the main component is added with sugarcane bagasse. Although sugarcane bagasse is biodegradable, pollution-free, renewable, and has high strength, it is also vulnerable to the erosion of moisture and microorganisms in the external environment. When the contents of polyamide-epichlorohydrin resin and cationic starch are 1.0% and 0.6% respectively, its tensile strength and wet strength are 12.2 MPa and 2.1 MPa respectively, the contact angle and water absorption rate are 128° and 51.5% respectively, and the water vapor transmission rate is 639.7 g / m2·day. Obviously, the synergistic effect between polyamide-epichlorohydrin resin, cationic starch and cellulose fiber makes the mechanical and moisture-proof properties of the pulp molding products better.

[0041] When preparing the slurry of the present invention, some plant fibers are replaced with recycled waste corrugated paper to realize the recycling of waste cartons and save costs. At the same time, based on the fact that the beating degree can reflect the ease of dewatering of the slurry and can also reflect the degree of fiber cutting, swelling, fibrillation and fibrillation, at this time, the beating degree of the slurry is optimized to keep the slurry with good water filtration performance and improve the comprehensive performance of the sugarcane bagasse pulp packaging material.

[0042] When the slurry is to be filtered, polyacrylamide can flocculate the particulate matter, reduce the filtration, improve the dewatering property and retention rate of the pulp, and further improve the dewatering property, retention rate and quality of the coffee residue pulp packaging material.

[0043] The degradable packaging box for tomatoes provided by the present invention can prevent tomatoes from colliding and squeezing with each other during transportation through the buffer cushion corners; the entire packaging box material is sugarcane bagasse, and there are 12 circular ventilation holes inside the bottom of the box, forming a ventilation inlet and outlet, which is conducive to the fresh-keeping storage and transportation of tomatoes; and it combines transportation packaging and retail into one, reducing mechanical damage and labor costs brought by the turnover process.

[0044] In summary, the present invention has at least the following beneficial effects:

[0045] Recycling the waste sugarcane bagasse after production and processing and using it as the main slurry component of pulp packaging to produce a degradable pulp packaging box for tomato packaging. The recycling of sugarcane bagasse is biodegradable, renewable, reduces environmental pollution, reduces production costs, effectively implements the concept of green environmental protection, is conducive to sustainable development and regeneration, and is an effective way to realize industrial batch production in factories.

[0046] When a modified polyamide-epichlorohydrin resin is added to the slurry, the synergistic effect among the polyamide-epichlorohydrin resin, cationic starch and cellulose fiber makes the mechanical and moisture-proof properties of the pulp molded product better. It improves the comprehensive performance of sugarcane pulp packaging.

[0047] A buffer protection belt is provided around the inner periphery of the box body; there are buffer cushion corners at the four corners inside the packaging box; the buffer protection belt and the buffer cushion corners can fix the tomatoes, preventing the tomatoes from colliding and squeezing against each other during transportation. The circulation of air and anti-collision extrusion can extend the storage period of tomatoes and is beneficial for transportation. The length of the upper bottom of the box body is 16 cm, the length of the lower bottom is 13 cm, the width of the upper bottom is 12 cm, the width of the lower bottom is 9 cm, and the height is 7 cm. The circular buffer cushion corners at the four corners inside the box body can restrict the tomatoes, allowing a gap between the tomatoes, which is beneficial for the circulation of air. Since the density of CO2 is slightly heavier than that of air, more CO2 accumulates at the bottom inside the box body. The lidless packaging box and the ventilation holes inside the box bottom can allow O2 to pass through, which is beneficial for the formation of a gas environment and storage and preservation. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] Figure 1 Schematically shows the structure of the packaged product in a preferred embodiment of the present invention;

[0049] Figure 2 Schematically shows a coating brush for an antibacterial coating that fits with this packaging box;

[0050] Figure 3 Schematically shows the fresh-keeping effects of different packaged products on tomatoes;

[0051] DESCRIPTION OF THE REFERENCE NUMERALS:

[0052] 1. Box body, 2. Circular ventilation hole, 3. Buffer cushion corner, 4. Buffer protection belt, 5. Sealing edge, 6. Water-absorbing sponge, 7. Handle. DETAILED DESCRIPTION OF THE INVENTION

[0053] The present invention will be further described in detail below in conjunction with the specific embodiments. The provided embodiments are only for clarifying the present invention, rather than limiting the scope of the present invention. The following provided embodiments can be used as a guide for those of ordinary skill in the art to make further improvements, and do not limit the present invention in any way.

[0054] The experimental methods in the following embodiments are all conventional methods unless otherwise specified, and are carried out according to the technologies or conditions described in the literature in this field or according to the product instructions. The materials, reagents, etc. used in the following embodiments can be obtained from commercial channels unless otherwise specified.

[0055] Example 1

[0056] 1. Preparation of Slurry 1

[0057] The following method is used to prepare Slurry 1: Add 50 kg of plant fiber and 40 kg of recycled waste paper into a mixing barrel and stir for 40 min. Then transfer it to a crusher and crush for 40 min to obtain particulate matter, and the residue on a 20-mesh sieve of the particulate matter is 5%. Then add 1500 kg of water and 2 kg of retention aid into the particulate matter and stir for 40 min. Then transfer it to a hydrapulper for pulping for 40 min, and then transfer it to a refiner for beating until the beating degree reaches 1200 r to obtain the slurry. Among them, the plant fiber is straw stalks and corncobs, and the weight ratio of straw stalks to corncobs is 1:0.6; the recycled waste paper is waste corrugated cardboard; the retention aid is polyacrylamide (Guangxi Guitang (Group) Co., Ltd.).

[0058] 2. Preparation of Slurry 2

[0059] Prepare the slurry according to the method in Step 2. After transferring it to the refiner, change the beating degree to 1300 r until it reaches 1300 r, and keep other steps unchanged to obtain Slurry 2.

[0060] In the above embodiments, the slurry can be made from the following raw materials in parts by weight: 1500 parts of water, 40 parts of plant fiber, 35 parts of recycled waste corrugated cardboard, and 3 parts of retention aid. It can also be adjusted as needed to: 1500 parts of water, 35 parts of plant fiber, 30 parts of recycled waste paper, and 2 parts of retention aid; or, 1500 parts of water, 45 parts of plant fiber, 40 parts of recycled waste paper, and 4 parts of retention aid, etc. Optionally, the plant fiber is straw stalks and corncobs, and the weight ratio of straw stalks to corncobs is 1:(0.2 - 0.4). Optionally, the retention aid is polyacrylamide; the recycled waste paper is recycled waste corrugated cardboard.

[0061] Example 2

[0062] In this embodiment, the average particle size of bagasse is 5 μm; the cationic starch is sodium carboxymethyl starch (Shandong Siyang Biotechnology Co., Ltd.). The functional additives are two kinds, namely a water repellent and an oil repellent. The weight ratio of the water repellent to the oil repellent is 1:1. The water repellent is a modified fluorine-free acrylic copolymer; the oil repellent is a compound oil repellent mixed with cationic starch, carboxymethyl cellulose, and fluorine-free silicon. The slurry used is Slurry 1 prepared in Example 1.

[0063] 1500 parts by weight, 10 - 20 parts by weight of bagasse

[0064] The preparation method of the bagasse pulp packaging material for tomato packaging in this embodiment includes the following steps:

[0065] S1: At a rotational speed of 1200 r / min, add 15 kg of slurry 1 and 200 g of bagasse into the stirring tank, then add the functional additive (40 g), stir for 40 min, then add 100 g of polyamide-epichlorohydrin resin and 60 g of cationic starch, and stir for 40 min;

[0066] S2: Add the mixture into the pulp molding machine for water filtration and molding to obtain a wet blank.

[0067] S3: Heat and dry the wet blank for shaping, trim the edges and set a turned-out sealing edge around the top of the box body, set circular ventilation holes at the bottom of the box, have buffer cushion corners at the four corners inside the packaging box, and have strip-shaped buffer bands around the box body; to ensure a smooth surface, remove the edge burrs and print the biodegradable logo pattern and the three-dimensional embossed words "BAGASSE".

[0068] S4: Sterilize the prepared finished product to obtain the bagasse pulp packaging product 1.

[0069] Example 2

[0070] Prepare the bagasse pulp packaging product for tomato packaging according to the method in Example 2. The difference from Example 2 is that slurry 1 is replaced with slurry 2, and other steps remain unchanged to obtain packaging product 2.

[0071] Example 3

[0072] Prepare the bagasse pulp packaging material for tomato packaging according to the method in Example 2. The difference from Example 2 is that the raw material ratio of the bagasse pulp packaging material is different, and its specific raw material ratio is 1500 parts by weight of slurry, 10 parts by weight of bagasse, 5 parts by weight of hydrophilic modified starch, 14 parts by weight of polyamide-epichlorohydrin resin, and 4 parts by weight of functional additive. Other steps remain unchanged to obtain packaging product 3.

[0073] In the above Examples 1-3, the average particle size of the bagasse is 2-12 μm. Preferably, the average particle size of the bagasse is 3-6 μm. In one example, the average particle size of the bagasse is 6 μm, which can be adjusted to 2 μm, 4 μm, 6 μm, 8 μm, 10 μm, etc. according to needs.

[0074] In the above Examples 1-3, the raw material ratio of the bagasse pulp packaging material can also be replaced with 1500 parts by weight of slurry, 10-20 parts by weight of bagasse, 5-7 parts by weight of cationic starch, 10-14 parts by weight of polyamide-epichlorohydrin resin, and 2-4 parts by weight of functional additive, and other ratios within this range.

[0075] In the above Examples 1-3, the molding shape of the packaging product is asFigure 1 As shown, it includes a box body, a hollow cavity with an open upper end of the box body, a sealing edge that is turned outward at the opening of the box body, air holes provided at the bottom of the box body, and a buffer belt on the side wall of the box body.

[0076] As a further solution, the box body is a cuboid cavity, and buffer cushion corners are provided at the four corners of the bottom of the box body.

[0077] As a further solution, the buffer cushion corner is a circular or arc-shaped protrusion extending towards the inside of the box body.

[0078] As a further solution, the buffer belt is a cylindrical protrusion extending towards the inside of the box body.

[0079] As a further solution, the box body is a multi-layer structure, which sequentially includes a degradable paper layer and a β-ionone antibacterial layer from the outside to the inside.

[0080] As a further solution, a 2,3-butanedione antibacterial layer is further provided in the β-ionone antibacterial layer.

[0081] As a further solution, the air holes are multiple circular, square or irregularly shaped air holes, and the edges of the air holes are smooth.

[0082] As a further solution, it further includes a matching sealing film. When in use, first put the tomatoes into the box body, and then connect the sealing film and the sealing edge through a heat sealer or the like.

[0083] As a further solution, the sealing film is a PE film, and there are many micro air holes on the PE film.

[0084] As a further solution, the degradable paper layer is made of degradable pulp. Preferably, the degradable pulp is bagasse pulp.

[0085] As a size specification of the present invention, it includes but is not limited to the following sizes: the length of the upper bottom of the box body is 16 cm, the length of the lower bottom is 13 cm, the width of the upper bottom is 12 cm, the width of the lower bottom is 9 cm, and the height is 7 cm; the width of the sealing edge at the top of the box body is 0.8 cm, the inner diameter of the buffer cushion corner is 1.5 cm, and the height is 0.8 cm; the length of the buffer protection belt around the box body is 7 cm, the width is 2 cm, the length of the buffer protection belt inside the box bottom is 2 cm, and the width is 2 cm; the inner diameter of the circular air hole is 0.6 cm, and the length is 0.6 cm.

[0086] Example 4

[0087] On the basis of Example 1, a packaging product with an antibacterial coating is prepared.

[0088] 1. Preparation of 2,3-butanedione antibacterial coating solution: Take β-cyclodextrin and dissolve and disperse it by oscillating under ultrasonic conditions at 60 °C and a frequency of 40 kHz. Add different amounts of 2,3-butanedione (g) and Tween-80, and ultrasonically oscillate for 80 min at 60 °C, then let it stand for 24 h. Under stirring in a 45 °C water bath, add carboxymethyl chitosan and stir well to dissolve to prepare 2,3-butanedione antibacterial coating solutions with mass fractions (W / V) of 0.5% and 1.0% (the corresponding 2,3-butanedione contents are 0.05 g / L and 0.1 g / L).

[0089] 2. Preparation of β-ionone antibacterial coating solution: Weigh chitosan and dissolve it in acetic acid solution (1% V / V), heat and stir in a 60 °C water bath to make it fully dissolve; add plasticizer glycerol (1% V / V), continue to stir at 60 °C for 1 h to prepare a chitosan coating solution with a mass fraction of 2.0 (W / V)%, and cool it to room temperature for standby. Then accurately weigh β-cyclodextrin and dissolve it in distilled water in a 60 °C water bath to form a β-cyclodextrin supersaturated solution. Weigh different amounts of β-ionone antibacterial agent, dissolve it with absolute ethanol (1 mg / ml), and drop the solution into the saturated aqueous solution of β-cyclodextrin drop by drop. Add Tween-80 emulsifier, disperse for 20 min, then take out the mixture after stirring at a certain temperature for a certain time. After the solution cools to room temperature, let it stand in a 4 °C refrigerator for 24 h to solidify, and filter it under reduced pressure with a vacuum pump. Wash the obtained filter residue with absolute ethanol to remove the unencapsulated antibacterial agent (wash 3 times), and wash it with distilled water to remove the excess β-cyclodextrin (wash 3 times) to obtain wet microcapsules. Place the wet microcapsules on a watch glass and dry them in an oven at 50 °C to constant weight to obtain dry microcapsules (β-ionone antibacterial agent microcapsule products). Add plasticizer glycerol (1% V / V) and β-ionone antibacterial agent microcapsules (the addition amounts are 0.5% (W / V) and 1.0% respectively) to the chitosan coating solution, continue to stir at 60 °C for 1 h to make it fully mixed, and obtain 2 groups of β-ionone microcapsule antibacterial coating solutions with different concentrations, and cool them to room temperature for standby (the corresponding β-ionone contents are 0.05 g / L and 0.1 g / L).

[0090] 3. The specific steps of the coating process are as follows: Use a brush adapted to the packaging product to evenly apply the β-ionone microcapsule antibacterial coating solution on the inner surface of the box body with an adapted brush, air-dry it at room temperature, and then evenly apply the 2,3-butanedione antibacterial coating solution with a brush to obtain an antibacterial coating. The brush is as Figure 2 shown, including a water-absorbing sponge 6 and a handle 7. The shape of the water-absorbing sponge is adapted to the size of the accommodating cavity in the box body. When the brush is placed in the box body, the outer surface of the water-absorbing sponge contacts the inner surface of the box body.

[0091] When using an antibacterial coating solution of 2,3-butanedione with a mass fraction (W / V) of 0.5% and an antibacterial coating solution of β-ionone with a mass fraction (W / V) of 0.5%, a packaged product added with 0.5% 2,3-butanedione + 0.5% β-ionone is prepared. When using an antibacterial coating solution of 2,3-butanedione with a mass fraction (W / V) of 0.5% and an antibacterial coating solution of β-ionone with a mass fraction (W / V) of 1%, a packaged product added with 0.5% 2,3-butanedione + 1% β-ionone is prepared. When using an antibacterial coating solution of 2,3-butanedione with a mass fraction (W / V) of 1% and an antibacterial coating solution of β-ionone with a mass fraction (W / V) of 0.5%, a packaged product added with 1% 2,3-butanedione + 0.5% β-ionone is prepared. When using an antibacterial coating solution of 2,3-butanedione with a mass fraction (W / V) of 1% and an antibacterial coating solution of β-ionone with a mass fraction (W / V) of 1%, a packaged product added with 1% 2,3-butanedione + 1% β-ionone is prepared.

[0092] The packaged products with antibacterial coatings prepared above, the packaged product 1 prepared in Example 2, and a commercially available ordinary plastic tomato packaging box are used to place the same batch of cherry tomatoes and stored at 20°C for 16 days to compare their storage effects, as Figure 3 shown. It can be seen from Figure 3 that the plastic box has the worst fresh-keeping effect. The present invention has an obvious effect on tomato fresh-keeping, and the effect of coating an antibacterial coating on the basis of the present invention is the best, significantly reducing the rot of tomatoes and improving the storage quality of fruits.

[0093] The present invention has been described in detail above. For those skilled in the art, without departing from the gist and scope of the present invention and without unnecessary experiments, the present invention can be implemented within a relatively wide range under equivalent parameters, concentrations, and conditions. Although specific embodiments of the present invention are given, it should be understood that the present invention can be further improved. In short, according to the principle of the present invention, this application intends to cover any modification, use, or improvement of the present invention, including those that depart from the scope disclosed in this application but are made by conventional techniques known in the art. Some basic features can be applied according to the scope of the following appended claims.

Claims

1. A preparation method of a degradable pulp packaging product suitable for tomato transportation and storage, characterized in that, It includes the following steps: S1: Add functional additives to the slurry, stir and mix, then add modified polyamide-epichlorohydrin resin, stir and mix, add bagasse, stir evenly to obtain a mixed slurry. The modified polyamide-epichlorohydrin resin is made by mixing polyamide-epichlorohydrin resin with cationic starch; S2: Vacuum adsorb and dehydrate the mixed slurry to form a wet blank; S3: Heat and dry the wet blank to set it, obtaining a semi-finished packaging product; S4: Sterilize the semi-finished packaging product prepared in step S3 to obtain a crude bagasse pulp packaging product; S5: Perform a coating process on the crude packaging product prepared in step S4, apply an antibacterial coating to obtain a degradable pulp packaging product suitable for tomato transportation and storage.

2. The preparation method according to claim 1, characterized in that, The raw material components in step S1) are 1500 parts by weight of slurry, 10-20 parts by weight of bagasse, 5-7 parts by weight of cationic starch, 10-14 parts by weight of polyamide-epichlorohydrin resin, and 2-4 parts by weight of functional additives.

3. The preparation method according to claim 2, characterized in that, The preparation method of the slurry is to stir and mix plant fibers and recycled waste paper, crush them to obtain particulate matter, then add water and a retention aid to the particulate matter, stir and mix, break the pulp, and beat the pulp to obtain the slurry. The weight ratio of the materials is: 1500 parts of water, 35-45 parts of plant fibers, 30-40 parts of recycled waste paper, and 2-4 parts of retention aid; the beating speed is 1200 r or 1300 r.

4. The preparation method according to claim 2, characterized in that, The structure of the packaging product includes a box body with an open upper end. There is a turned-out sealing edge at the opening of the box body. There are ventilation holes at the bottom of the box body. There is a buffer strip on the side wall of the box body. There are buffer cushion corners at the four corners of the bottom of the box body.

5. The preparation method according to claim 4, characterized in that, The buffer cushion corner is a circular or arc-shaped protrusion extending towards the inside of the box body; the buffer strip is a cylindrical protrusion extending towards the inside of the box body; the ventilation holes are multiple ventilation holes in circular, square, or irregular shapes, and the edges of the ventilation holes are smooth.

6. The preparation method according to claim 1, characterized in that, The specific steps of the coating process are to use a brush adapted to the packaging product to apply 2,3-butanedione antibacterial coating solution and / or β-ionone antibacterial coating solution to the inner surface of the packaging product.

7. The preparation method according to claim 6, characterized in that, The preparation method of the 2,3-butanedione antibacterial coating solution is: Take β-cyclodextrin, oscillate and dissolve it under ultrasonic waves, add 2,3-butanedione (g) and Tween-80, ultrasonically oscillate, let it stand, and under water bath stirring, add carboxymethyl chitosan, and stir and dissolve fully to prepare the 2,3-butanedione antibacterial coating solution.

8. The preparation method according to claim 6, characterized in that, The preparation method of the β-ionone antibacterial coating solution is as follows: Weigh chitosan and dissolve it in acetic acid solution, add the plasticizer glycerol, and stir for h to prepare the chitosan coating solution, which is cooled to room temperature for standby; dissolve β-cyclodextrin in distilled water to form a β-cyclodextrin supersaturated solution; dissolve the β-ionone antibacterial agent in absolute ethanol, and gradually add the solution dropwise to the saturated aqueous solution of β-cyclodextrin, add Tween-80 emulsifier, and after dispersion, the mixed solution is taken out after stirring at a certain temperature for a certain time. After the solution is cooled to, it is allowed to stand, solidify, and vacuum filtered. The obtained filter residue is washed with absolute ethanol to remove the unencapsulated antibacterial agent, and washed with distilled water to remove the excess β-cyclodextrin to obtain wet microcapsules; the wet microcapsules are dried to a constant weight to obtain dry β-ionone antibacterial agent microcapsules; add the plasticizer glycerol and β-ionone antibacterial agent microcapsules to the chitosan coating solution and stir until it is fully mixed to obtain the β-ionone microcapsule antibacterial coating solution.

9. The preparation method according to any one of claims 1-8, characterized in that, The packaging product further includes a sealing film used in conjunction with the box body, and the sealing film is connected to the sealing edge.

10. A packaging product prepared by the preparation method according to any one of claims 1-9.

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