Alcohol bag for food preservation and preparation method thereof

Abstract

The invention belongs to the field of food fresh-keeping products, and particularly relates to an alcohol bag for food fresh keeping and a preparation method of the alcohol bag. The alcohol fresh-keeping material comprises a front-side wrapping material, a back-side wrapping material and an alcohol fresh-keeping material body, a middle reserved cavity is formed by the front-side wrapping material and the back-side wrapping material in a peripheral hot-pressing mode, and the middle reserved cavity is filled with an alcohol fresh-keeping material body. Ventilation micropores are formed in the front surface wrapping material. Each of the front-side surface profile and the back-side surface profile consists of a high-temperature-resistant printing layer, a composite connecting layer and a heat-sealing layer; the high-temperature-resistant printing layer is an outer surface layer and is formed by any combination of PET, OPP, CPP, NY and TQPE in a co-extrusion mode, a plurality of breathable micropores are evenly formed in the high-temperature-resistant printing layer, and volatilization of alcohol is controlled through the size of the pore diameter and a matrix; the packaging film formed by extruding macromolecules ensures that alcohol is air-permeable and liquid-impermeable during volatilization, the volatilization speed can be adjusted, the situation that the taste of food is affected by overhigh local alcohol concentration is not easily caused, and meanwhile, the food can be kept fresh for a long time.

Description

Technical Field

[0001] The invention belongs to the technical field of food preservation products, and in particular relates to an alcohol bag for food preservation and a preparation method thereof. Background Art

[0002] Alcohol preservatives for food are an externally controlled fresh-keeping product widely used in the food industry, especially in the baking industry. Generally, high-moisture products are prone to mold and microbial growth. Traditional methods often use preservatives to extend shelf life. With the improvement of people's living standards, the trend is for green, clean externally controlled preservatives to replace internally controlled preservative additives. In recent years, the use of externally controlled fresh-keeping products such as deoxidizers and alcohol bags has increased dramatically. However, the deoxidizers currently on the market have the following shortcomings:

[0003] 1. Powder-type deoxidizers have problems such as powder leakage and spots, which will affect the hygiene and flavor of food. Such abnormal products have a poor effect on food preservation and may even make the food inedible;

[0004] 2. Alcohol products generally have an uncontrolled evaporation rate. The alcohol evaporates too quickly in a short period of time, resulting in a strong alcohol smell in the food bag. In addition, the evaporation rate in a short period of time is too fast to meet the antibacterial requirements of continuously maintaining the alcohol concentration for products with medium and long shelf lives.

[0005] 3. At the same time, the part of the alcohol tablet that comes into contact with the food will have a noticeable bitter taste, and the food will have a poor smell and taste after opening the bag;

[0006] 4. The card-like structure of the alcohol tablet is prone to jamming during processing, resulting in a high abnormality rate and low production efficiency;

[0007] 5. There is a risk of alcohol extrusion inside the alcohol sheet after negative pressure. If extrusion problems occur during production, rework costs will increase; if extrusion problems occur during food packaging, it will affect the quality of the food.

[0008] In response to the above problems, it is urgent to develop an alcohol bag product with a controllable alcohol evaporation rate and that will not penetrate liquids. Summary of the Invention

[0009] In order to solve the defects and shortcomings of the prior art, the purpose of the present invention is to provide an alcohol bag for food preservation with a simple structural design, which is air-permeable and liquid-tight and has a controllable alcohol evaporation rate, and a preparation method thereof. The packaging film is formed by polymer extrusion to ensure that the alcohol is air-permeable and liquid-tight when evaporating, and the evaporation rate is adjustable, which is not likely to cause excessive local alcohol concentration to affect the taste of food, and at the same time can preserve food for a long time. In addition, by compounding alcohol and water in a relatively optimal ratio to obtain a fresh-keeping material, or using a water-absorbing carrier to carry the preservative, a food alcohol preservative with a relatively good alcohol vapor release rate is obtained, which can better maintain the flavor of food while achieving sterilization and preservation.

[0010] To achieve the above object, the technical solution adopted by the present invention is:

[0011] It comprises a front wrapping material, a back wrapping material and an alcohol fresh-keeping material body; the front wrapping material and the back wrapping material are formed into a middle reserved cavity by periphery hot pressing, and the middle reserved cavity is filled with the alcohol fresh-keeping material body; wherein, the front wrapping material is provided with breathable micropores.

[0012] Preferably, the ventilating micropores are conical holes, the Y-axis angle of the side wall slope is 0-70°, and the taper is adjustable to assist in controlling the volatilization rate of the alcohol.

[0013] Preferably, the front cover material and the back cover material are both composed of a high temperature resistant printing layer, a composite connecting layer, and a heat sealing layer.

[0014] The high-temperature resistant printed layer is the outer surface layer, which is co-extruded by any combination of PET, OPP, CPP, NY, and TQPE. It has breathable and liquid-impermeable properties, high compressive strength and certain toughness. A number of breathable micropores are evenly arranged on the high-temperature resistant printed layer, and the volatilization of alcohol is controlled by the size of the pores and the matrix.

[0015] The composite connecting layer is an intermediate layer made by melting, weaving and wrapping two or more particles of OP, CPP, NY, EVOH, NK and TQPE, and has good air permeability and heat sealing functions.

[0016] The heat-sealing layer is an inner layer, which is formed by a multi-layer co-extruded blown film of any combination of OPP, CPP, NY, EVOH, NK, and TQPE, and has a sealing and liquid-blocking function.

[0017] The co-extrusion blown film forming is firstly formed by extruding any combination of several polymer particles, and then the formed film layer is co-extruded and blown through professional equipment; the multi-layer co-extrusion is 2-12 layers of co-extrusion blown film.

[0018] Preferably, the alcohol fresh-keeping material is a pure liquid, which is mainly a mixture of alcohol and water.

[0019] Preferably, the alcohol preservative material is a colloidal mixture, which is made from the following raw materials in the following mass percentages:

[0020] Alcohol 30-95%

[0021] Water 25-70%

[0022] Emulsifier 0.01-1%

[0023] Thickener 0.01-5%;

[0024] Wherein, the emulsifier is one or more of carbomer, hydroxyethyl cellulose, sodium carboxymethyl cellulose, carrageenan, and glycerin;

[0025] The thickener is one or more strongly alkaline or weakly alkaline substances such as triethanolamine, sodium hydroxide, potassium hydroxide, and calcium hydroxide.

[0026] Preferably, the alcohol preservative material body uses non-woven fabric, absorbent cotton, and strong wet paper as a carrier.

[0027] Preferably, the alcohol preservative material is a granular material, and its main components are: granular adsorbent (mainly including: one or more of silicon dioxide, diatomaceous earth, resin, vermiculite, zeolite, etc.), water, and 30%-95% concentration of alcohol.

[0028] Preferably, the alcohol preservative material is in powder form, and its main components are: powdered adsorbent (mainly including one or more of silicon dioxide, diatomaceous earth, resin, vermiculite, zeolite, etc.), water, and 30%-95% concentration alcohol.

[0029] Preferably, a cutting limit cursor layer is provided at the upper and lower ends of the back cover material.

[0030] Preferably, the breathable micropores on the back cover material can adjust the alcohol volatilization rate by adjusting the pore diameter and pore spacing.

[0031] Preferably, warning and instruction layers are printed on the surfaces of the front cover material and the back cover material.

[0032] Preferably, the structural layers of the front cladding material and the back cladding material are formed in different forms, and the product has a four-side sealed structure.

[0033] Preferably, the peripheries of the front cover material and the back cover material are grid hot embossed, and the staggered grid hot embossing can effectively improve the sealing performance.

[0034] Preferably, the front cover material and the back cover material are an integrally formed structure, the product has a three-side sealed structure, and breathable micropores are set on one side.

[0035] A method for preparing an alcohol preservative for food is prepared by the following steps:

[0036] S1. Slowly add emulsifier to water in proportion while stirring, and use a mixing device to stir until the emulsifier is completely dissolved;

[0037] S2. Add alcohol to the solution in S1 in proportion and stir until uniform. Then slowly add thickener while stirring to make the solution uniform and gel-like.

[0038] S3, after standing for two hours, the alcohol preservation material body 3 is obtained.

[0039] The alcohol fresh-keeping material body 3 prepared above is transported to the packaging equipment through a transport pipeline, and is hot-pressed and packaged by the front-side wrapping material 1 and the back-side wrapping material 2.

[0040] Preferably, the stirring speed of adding the thickener in step S1 is 500 r / min and the time is 10-12 h; the amount of the preservative added in step S2 is 0.073-0.143 g / cm 2 .

[0041] After adopting the above structure, the beneficial effects of the present invention are:

[0042] 1. The alcohol or alcohol mixture inside can achieve better preservation effect;

[0043] 2. Use packaging materials with high heat sealing performance, good air permeability and liquid-proof to prevent leakage of internal liquid.

[0044] 3. The volatilization of alcohol is controlled by micropores of different sizes, shapes and matrices, avoiding the drawbacks of existing technologies. It will not cause excessive local alcohol concentration to affect the taste of food, and play a protective role in the entire shelf life of food.

[0045] 4. The product is safe and reliable, without any food contamination; it has a light smell, is non-irritating, and has no effect on the flavor of food. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the present invention is described in detail through the following specific implementations and drawings.

[0047] Figure 1 It is a structural schematic diagram of the present invention;

[0048] Figure 2 Schematic diagram of the hierarchical structure of the packaging material of the present invention (the bevel angle of the breathable micropores is 0°, i.e., straight-edge holes);

[0049] Figure 3 Schematic diagram of the tapered angle of the ventilating micropores of the present invention;

[0050] Figure 4 A top view of the four-side seals of the alcohol bag of the present invention;

[0051] Figure 5 A top view of the three-side seal of the alcohol bag of the present invention;

[0052] Description of reference numerals:

[0053] Front cover material 1, back cover material 2, alcohol preservative material body 3, breathable micropores 4, high temperature resistant printing layer 5, composite connecting layer 6, heat sealing layer 7. DETAILED DESCRIPTION

[0054] To make the objectives, technical solutions, and advantages of the present invention more clearly apparent, the present invention is described below using specific embodiments shown in the accompanying drawings. However, it should be understood that these descriptions are merely illustrative and are not intended to limit the scope of the present invention. In addition, in the following description, descriptions of well-known structures and technologies are omitted to avoid unnecessary confusion of the concepts of the present invention.

[0055] It should also be noted that, in order to avoid obscuring the present invention due to unnecessary details, the accompanying drawings only show structures and / or processing steps closely related to the solutions according to the present invention, while other details that are not closely related to the present invention are omitted.

[0056] Example 1

[0057] See Figure 1-Figure 5 As shown, this specific embodiment adopts the following technical solution: it includes a front wrapping material 1 and a back wrapping material 2, and the two are made of different materials. The product has a four-side sealed structure, the alcohol preservative material body 3 is a gel-like structure, and breathable micropores 4 are provided on the front wrapping material 1. The Y-axis direction angle of the inclined surface of the side wall of the breathable micropores 4 is 35°, and the matrix of the breathable micropores 4 is 14*8; there are no holes on the back wrapping material 2.

[0058] The outer surface layer of the front cover material 1 is formed by co-extrusion of PET, NY, and TQPE; the middle layer is made by melting, weaving, and wrapping NY, EVOH, NK, and TQPE; the inner layer is formed by co-extrusion blown film of OPP, CNY, EVOH, NK, and TQPE, and has sealing and liquid-resistant functions.

[0059] The outer surface layer of the back cover material 2 is formed by co-extrusion of OPP, NY, and TQPE; the middle layer is made by wrapping NY and TQPE; the inner layer is formed by co-extrusion blown film of CNY, EVOH, NK, and TQPE, and has sealing and liquid-resistant functions.

[0060] The preparation steps of the alcohol fresh-keeping material body 3 are as follows:

[0061] S1. Slowly add 0.01 parts of carbomer to 70 parts of water while stirring, and use a mixing device to stir until the emulsifier is completely dissolved;

[0062] S2. Add 30 parts of 96% alcohol to the solution in S1 and stir until uniform. Then, slowly add 1 part of 0.1 mol / L sodium hydroxide while stirring until the solution is uniform and gel-like.

[0063] S3, after standing for two hours, the alcohol preservation material body 3 is obtained.

[0064] The alcohol fresh-keeping material body 3 prepared above is transported to the packaging equipment through a transport pipeline, and is hot-pressed and packaged by the front-side wrapping material 1 and the back-side wrapping material 2.

[0065] Example 2

[0066] The difference between this embodiment and the first embodiment is that:

[0067] The preparation steps of the alcohol fresh-keeping material body 3 are as follows:

[0068] S1. Slowly add 0.01 parts of hydroxyethyl cellulose to 60 parts of water while stirring, and use a mixing device to stir until the emulsifier is completely dissolved;

[0069] S2. Add 40 parts of 96% alcohol to the solution in S1 and stir until uniform. Then slowly add 1 part of 0.1 mol / L sodium hydroxide while stirring until the solution is uniform and gelatinous.

[0070] S3, after standing for two hours, the alcohol preservation material body 3 is obtained.

[0071] The Y-axis angle of the inclined surface of the side wall of the ventilation micropores 4 is 40°, and the matrix of the ventilation micropores 4 is 15*6.

[0072] The rest is the same as that of the first embodiment.

[0073] Example 3

[0074] The difference between this embodiment and the first embodiment is that:

[0075] The preparation steps of the alcohol fresh-keeping material body 3 are as follows:

[0076] S1. Slowly add 0.01 parts of sodium carboxymethyl cellulose to 50 parts of water while stirring, and use a mixing device to stir until the emulsifier is completely dissolved;

[0077] S2. Add 50 parts of 96% alcohol to the solution in S1 and stir until uniform. Then slowly add 1 part of 0.1 mol / L sodium hydroxide while stirring until the solution is uniform and gel-like.

[0078] S3, after standing for two hours, the alcohol preservation material body 3 is obtained.

[0079] The Y-axis angle of the inclined surface of the side wall of the ventilation micropores 4 is 5°, and the matrix of the ventilation micropores 4 is 16*6.

[0080] The rest is the same as that of the first embodiment.

[0081] Example 4

[0082] The difference between this embodiment and the first embodiment is that:

[0083] The preparation steps of the alcohol fresh-keeping material body 3 are as follows:

[0084] S1. Slowly add 0.01 glycerol to 50 parts of water while stirring, and use a mixing device to stir until the emulsifier is completely dissolved;

[0085] S2. Add 50 parts of 96% alcohol to the solution in S1 and stir until uniform. Then slowly add 1 part of 0.1 mol / L sodium hydroxide while stirring until the solution is uniform and gel-like.

[0086] S3, after standing for two hours, the alcohol preservation material body 3 is obtained.

[0087] The Y-axis direction angle of the inclined surface of the side wall of the ventilation micropores 4 is 45 degrees, and the matrix of the ventilation micropores 4 is 16*6.

[0088] The rest is the same as that of the first embodiment.

[0089] Example 5

[0090] The difference between this embodiment and the first embodiment is that:

[0091] The preparation steps of the alcohol fresh-keeping material body 3 are as follows:

[0092] S1. Slowly add 0.01 glycerol to 45 parts of water while stirring, and use a mixing device to stir until the emulsifier is completely dissolved;

[0093] S2. Add 55 parts of 96% alcohol to the solution in S1 and stir until uniform. Then, slowly add 1 part of 0.1 mol / L potassium hydroxide while stirring until the solution is uniform and gelatinous.

[0094] S3, after standing for two hours, the alcohol preservation material body 3 is obtained.

[0095] The Y-axis angle of the inclined surface of the side wall of the ventilation micropores 4 is 35°, and the matrix of the ventilation micropores 4 is 18*6.

[0096] The rest is the same as that of the first embodiment.

[0097] Example 6

[0098] The difference between this embodiment and the first embodiment is that the alcohol preservative material 3 is a mixture of 65 parts of alcohol and 35 parts of water.

[0099] The outer surface layer of the back cover material 2 is co-extruded from OPP, NY, and TQPE; the middle layer is made from NY and TQPE by melting process; the inner layer is co-extruded from CNY, EVOH, NK, and TQPE by blown film, which has sealing and liquid-blocking functions.

[0100] The Y-axis angle of the inclined surface of the side wall of the ventilation micropores 4 is 25°, and the matrix of the ventilation micropores 4 is 16*8.

[0101] The rest is the same as that of the first embodiment.

[0102] Example 7

[0103] The difference between this embodiment and the first embodiment is that the alcohol preservation material body 3 includes a non-woven fabric carrier, which is embedded in the packaging bag during packaging so that the non-woven fabric carrier is immersed in the alcohol mixture.

[0104] The rest is the same as that of the first embodiment.

[0105] Example 8

[0106] The difference between this embodiment and the first embodiment is that the front covering material 1 is made of the same material as the back covering material 2, and the product has a three-side sealed structure.

[0107] The outer surface layer of the back cover material 2 is made of OPP, NY, and TQPE co-extruded; the middle layer is made of NY and TQPE through weaving process; the inner layer is made of CNY, EVOH, NK, and TQPE co-extruded ten-layer film, which has the function of sealing and liquid resistance.

[0108] The rest is the same as that of the first embodiment.

[0109] Example 9

[0110] This embodiment differs from the first embodiment in that the alcohol preservative material 3 is granular, and the granular adsorbent is silicon dioxide. 30 parts water and 70 parts alcohol are mixed and stirred uniformly, then added to 1000 parts silicon dioxide. The mixture is then stirred uniformly in a drum-type mixing tank to produce the alcohol material 3. All other aspects are the same as those of the first embodiment.

[0111] Example 10

[0112] The difference between this embodiment and the first embodiment is that the alcohol preservative material 3 is in powder form, and the powder adsorbent mainly includes one or more of silicon dioxide, diatomaceous earth, resin, vermiculite, zeolite, etc.

[0113] The rest is the same as that of the first embodiment.

[0114] Example 11

[0115] The difference between this embodiment and the first embodiment is that the alcohol preservative material body 3 is a mixture of 65 parts of alcohol and 35 parts of water, and adopts a three-side sealing structure.

[0116] The rest is the same as that of the first embodiment.

[0117] Example 12

[0118] The difference between this embodiment and the first embodiment is that the alcohol preservation material body 3 includes a cotton ball carrier, which is embedded in the packaging bag during packaging so that the cotton ball carrier is immersed in the alcohol mixture, and a three-side sealing structure is adopted.

[0119] The rest is the same as that of the first embodiment.

[0120] Example 13

[0121] The difference between this embodiment and the first embodiment is that:

[0122] The preparation steps of the alcohol fresh-keeping material body 3 are as follows:

[0123] S1. Slowly add 0.01 glycerol to 50 parts of water while stirring, and use a mixing device to stir until the emulsifier is completely dissolved;

[0124] S2. Add 50 parts of 96% alcohol to the solution in S1 and stir until uniform. Then slowly add 1 part of 0.1 mol / L sodium hydroxide while stirring until the solution is uniform and gel-like.

[0125] S3, after standing for two hours, the alcohol preservation material body 3 is obtained.

[0126] The Y-axis angle of the inclined surface of the side wall of the ventilation micropores 4 is 35°, and the matrix of the ventilation micropores 4 is 16*8.

[0127] Adopt three-side sealing structure.

[0128] The rest is the same as that of the first embodiment.

[0129] Example 14

[0130] This embodiment differs from the first embodiment in that the alcohol preservative material 3 is granular, and the granular adsorbent is diatomaceous earth. 30 parts water and 70 parts alcohol are mixed and stirred uniformly, then added to 1000 parts diatomaceous earth. The mixture is then stirred uniformly in a drum-type mixing tank to produce the alcohol material 3. The Y-axis angle of the inclined surface of the ventilation micropores 4 is 30°, and the matrix of ventilation micropores 4 is 18*8.

[0131] The rest is the same as that of the first embodiment.

[0132] Example 15

[0133] The difference between this embodiment and the first embodiment is that the back covering material 2 is made of the same material as the front covering material 1, and the product has a three-side sealed structure.

[0134] The Y-axis angle of the inclined surface of the side wall of the ventilation micropores 4 is 40°, and the matrix of the ventilation micropores 4 is 15*8.

[0135] The rest is the same as that of the first embodiment.

[0136] Example 16

[0137] The difference between this embodiment and embodiment 1 is that the back covering material 2 is made of the same material as the front covering material 1, the front covering material 1 is provided with a taper, the horizontal angle of the hole wall is 60°, and the product has a three-side sealing structure; the rest is the same as embodiment 1.

[0138] Comparative Example 1

[0139] It includes a front wrapping material 1 and a back wrapping material 2. The product has a four-side sealed structure. The alcohol preservative material body 3 is a gel-like structure. Breathable micropores 4 are provided on the front wrapping material 1. The Y-axis direction angle of the inclined surface of the side wall of the breathable micropores 4 is 35°, and the matrix of the breathable micropores 4 is 16*7; the back wrapping material 2 is not punched.

[0140] The outer surface layer of the front cover material 1 is formed by co-extrusion of PET, NY, and TQPE; the middle layer is made by weaving and extrusion of NY, EVOH, NK, and TQPE; and the inner layer is formed by co-extrusion blown film of five layers of OPP, CNY, EVOH, NK, and TQPE.

[0141] The outer surface layer of the back cover material 2 is formed by co-extrusion of OPP, NY, and TQPE; the middle layer is made by wrapping and extruding NY and TQPE; the inner layer is formed by co-extrusion blown film of nine layers of CNY, EVOH, NK, and TQPE.

[0142] The preparation steps of the alcohol fresh-keeping material body 3 are as follows:

[0143] S1. Slowly add 0.01 parts of sodium carboxymethyl cellulose to 65 parts of water while stirring, and use a mixing device to stir until the emulsifier is completely dissolved;

[0144] S2. Add 35 parts of 96% alcohol to the solution in S1 and stir until uniform. Then slowly add 1 part of 0.1 mol / L sodium hydroxide while stirring until the solution is uniform and gelatinous.

[0145] S3, after standing for two hours, the alcohol preservation material body 3 is obtained.

[0146] The alcohol fresh-keeping material body 3 prepared above is transported to the packaging equipment through a transport pipeline, and is hot-pressed and packaged by the front-side wrapping material 1 and the back-side wrapping material 2.

[0147] Performance testing

[0148] The tested products are as follows:

[0149] The food alcohol preservatives prepared in Examples 1-16 and Comparative Example 1 have a specification of 40 mm*45 mm; the commercially available alcohol preservative cards have an alcohol content of 1 g and a specification of 40 mm*40 mm.

[0150] (1) Alcohol volatility test

[0151] The food alcohol preservative and commercially available alcohol preservative cards were placed at room temperature (25°C ± 2°C) for volatilization tests, and the alcohol volatilization amount (unit: g) was tested after 8h, 24h, 48h, 72h, 120h and 240h, respectively. The alcohol volatilization amount (unit: g) was calculated as follows: at 25°C, the weight of the food alcohol preservative and the commercially available alcohol preservative card before placement was weighed using an analytical balance. After placement for the corresponding time, the weight of the food alcohol preservative and the commercially available alcohol preservative card after placement was weighed using an analytical balance. The results were detected and recorded. The test results are shown in Table 1 below.

[0152] Alcohol volatiles = m1-m2

[0153] Where m1 is the initial mass and m2 is the subsequent mass

[0154] Table 1 Alcohol volatilization data of food alcohol preservatives of Examples 1-16 and Comparative Example 1 and commercially available alcohol preservative cards

[0155]

[0156]

[0157] Combining Examples 1-16, Comparative Example 1 and commercially available alcohol preservative cards and Table 1, it can be seen that the food alcohol preservative of the present application has a moderate volatilization rate and slowly releases alcohol vapor to sterilize and preserve food, while the alcohol volatilization amount of the commercially available alcohol preservative card in 8 hours is 1.2176 g, which is too fast compared to the food alcohol preservative of the present application.

[0158] (2) Repeated packaging alcohol volatility test

[0159] The food alcohol preservative and the commercially available alcohol preservative card were respectively placed in 45g baked bread packages and sealed. The alcohol volatilization amount (g) was tested after 8h, 24h, 48h, 72h, 120h and 240h. After each test, the package was sealed again and the test was repeated until all the alcohol in the food alcohol preservative and the commercially available alcohol preservative card was evaporated. The test results were tested and recorded. The test results are shown in Table 2 below.

[0160] Table 2 Alcohol volatilization data of repeated packaging of food alcohol preservatives and commercially available alcohol preservative cards of Examples 1-16 and Comparative Example 1

[0161]

[0162]

[0163] Combining Examples 1-16, Comparative Example 1 and commercially available alcohol preservative cards and Table 2, it can be seen that the alcohol volatilization amount of the food alcohol preservative of the present application remains stable after repeated packaging, while the alcohol volatilization content of the commercially available alcohol preservative card is as high as 1.2556 g in the first packaging. After the second packaging, the alcohol no longer evaporates, and the preservation effect on the food is reduced.

[0164] (3) Mold and food flavor testing

[0165] Food alcohol preservative and commercially available alcohol preservative cards were respectively placed in 45 g slice cake packages and sealed. The packages were placed in a constant temperature incubator (25±2°C). Samples were collected and processed according to the method in GB 4789.1-2016 "National Food Safety Standard - General Principles for Microbiological Examination of Foods". The samples were tested according to the method in GB 4789.15-2016 "National Food Safety Standard - Microbiological Examination of Foods - Mold and Yeast Count". The mold count (CFU / g) was detected and the alcohol odor in the packaging bags was detected by sniffing. The test results were recorded as shown in Table 3 below.

[0166]

[0167]

[0168]

[0169]

[0170] Table 3 is a table showing the mold and food flavor test data of the food alcohol preservatives of Examples 1-16 and Comparative Example 1 and commercially available alcohol preservative cards.

[0171] Combining Examples 1-16, Comparative Example 1 and the commercially available alcohol preservative card and Table 3, it can be seen that the alcohol preservative for food of the present application is packaged in food. After storage for 240 days, there is no obvious alcohol smell, the food flavor is good, and there is no mold, and the food preservation effect is good. However, the commercially available alcohol preservative card is packaged in food. After storage for 1 day, there is an obvious strong alcohol smell after storage for 4 days, which reduces the flavor of the food. In the blank test, the number of mold is greater than 150 CFU / g after storage for 1 day.

[0172] The alcohol described in the present invention is food grade alcohol.

[0173] The specifications of the present invention are not limited to 40mm*45mm, and any size specifications can be customized as needed. The matrix of breathable micropores can be flexibly set according to the specifications and food preservation requirements.

[0174] The invention uses alcohol as a main raw material for sterilization and preservation, compounds alcohol and water in a relatively optimal ratio, and then compounds with a thickener and sodium hydroxide for viscosity adjustment to prepare a preservative with a moderate volatilization rate and adhesion. The preservative is then carried by a water-absorbing carrier. When the preservative is carried on the water-absorbing carrier, it is not easy for the preservative prepared in this way to penetrate from the surface of the water-absorbing carrier. The prepared alcohol preservative for food has a low odor, can uniformly release alcohol vapor, and forms a gas phase protective layer of a certain concentration around the food. It has the dual effects of contact sterilization and fumigation sterilization, can inhibit the growth of various molds, bacteria and spoilage bacteria, and thus achieves a good preservation effect.

Claims

1. An alcohol bag for food preservation, characterized in that: It comprises a front cover material, a back cover material and an alcohol fresh-keeping material body; the front cover material and the back cover material are formed into a middle reserved cavity by peripheral hot pressing, and the middle reserved cavity is filled with the alcohol fresh-keeping material body; the front cover material is provided with air-permeable micropores.

2. The alcohol bag for food preservation according to claim 1, characterized in that: The ventilating micropores are conical holes, and the Y-axis direction angle of the side wall slope is 0-70 degrees.

3. The alcohol bag for food preservation according to claim 2, characterized in that: The front cover material and the back cover material are both composed of a high temperature resistant printing layer, a composite connection layer, and a heat sealing layer; The high temperature resistant printing layer is the outer surface layer, which is co-extruded by any combination of PET, OPP, CPP, NY, and TQPE. A number of breathable micropores are evenly arranged on the high temperature resistant printing layer, and the volatilization of alcohol is controlled by the size of the pores and the matrix; The composite connecting layer is an intermediate layer made by wrapping and extruding two or more particles of OP, CPP, NY, EVOH, NK, and TQPE; The heat-sealing layer is an inner layer, which is formed by a multi-layer co-extrusion blown film of any combination of OPP, CPP, NY, EVOH, NK, and TQPE.

4. The alcohol bag for food preservation according to claim 2, characterized in that: The alcohol fresh-keeping material is a pure liquid, which is mainly a mixture of alcohol and water.

5. The alcohol bag for food preservation according to claim 2, characterized in that: The alcohol fresh-keeping material is a colloidal mixture, which is made from the following raw materials in percentage by mass: Alcohol 30-95% Water 25-70% Emulsifier 0.01-1% Thickener 0.01-5%; Wherein, the emulsifier is one or more of carbomer, hydroxyethyl cellulose, sodium carboxymethyl cellulose, carrageenan, and glycerin; The thickener is one or more of triethanolamine, sodium hydroxide, potassium hydroxide and calcium hydroxide.

6. The alcohol bag for food preservation according to claim 2, characterized in that: The alcohol fresh-keeping material body uses non-woven fabric, absorbent cotton and strong wet paper as carriers.

7. The alcohol bag for food preservation according to claim 2, characterized in that: The alcohol fresh-keeping material is a granular body, and its main components are: water, 30%-95% concentration alcohol, and granular adsorbent. The granular adsorbent mainly includes: one or more of silicon dioxide, diatomaceous earth, resin, vermiculite, and zeolite.

8. The alcohol bag for food preservation according to claim 2, characterized in that: The alcohol fresh-keeping material is in powder form, and its main components are: water, 30%-95% alcohol, and powder adsorbent. The powder adsorbent mainly includes: one or more of silicon dioxide, diatomaceous earth, resin, vermiculite, and zeolite.

9. The alcohol bag for food preservation according to claim 2, characterized in that: The air-permeable micropores on the surface of the back cover material can adjust the alcohol volatilization rate by adjusting the pore diameter and the pore spacing.

10. The alcohol bag for food preservation according to any one of claims 1 to 9, wherein the preparation method thereof is as follows: S1. Slowly add emulsifier into water in proportion while stirring, and use a mixing device to stir until the emulsifier is completely dissolved; S2, add alcohol to the solution in S1 in proportion and stir until uniform, then slowly add thickener while stirring to make the solution uniform and gelatinous; S3, after two hours of rest, the alcohol fresh-keeping material body is obtained; The alcohol fresh-keeping material prepared above is transported to the packaging equipment through a transport pipeline, and is hot-pressed and packaged through the front-side wrapping material and the back-side wrapping material.

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