High-air-permeability packaging material and application thereof in production of agricultural microbial agent

Abstract

The invention relates to the technical field of breathable packaging materials, in particular to a high-breathability packaging material and application of the high-breathability packaging material in agricultural microbial agent production. The high-air-permeability packaging material comprises a PE film material inner layer and a PP film material outer layer, wherein the PE film material inner layer is composed of a plurality of layers of PE films; vent holes are formed in the PP film material; the PE film material inner layer and the PP film material outer layer are bonded through dispensing; and the dispensing positions are uniformly arranged on the imperforate position of the PP film material. The packaging material provided by the invention has relatively good air permeability, can be used for packaging agricultural microbial agents, and particularly can be used for packaging agricultural microbial agents containing aerobic bacteria and micro-aerobic bacteria with relatively high requirements on storage air permeability, so that the shelf life of microbial agent products can be effectively prolonged.

Description

Technical Field

[0001] The present application relates to the technical field of breathable packaging materials, and in particular to a highly breathable packaging material and its application in the production of agricultural microbial agents. Background Art

[0002] At present, the commonly used breathable packaging material is usually PE (polyethylene) film material, which is prepared by co-extrusion of 3-5 layers of PE film. Figure 1 As shown, the PE film material is prepared by co-extrusion of 3-layer 12-filament PE film, with a thickness of 12c and an air permeability of 1000cm 3 / (㎡·24h·0.1MPa). However, the compression resistance of PE film materials is insufficient. Products packaged with PE film materials are prone to rupture during transportation or when squeezed, so it is often necessary to cover them with one or more layers of PP (polypropylene) materials to improve the compression resistance of the product packaging materials. Figure 2 As shown, the material is a composite of PE film material and PP film material obtained by co-extrusion of 3-layer 12-filament PE film, with a thickness of 12.5c and an air permeability of 700cm 3 / (㎡·24h·0.1MPa).

[0003] It can be seen that after coating the product packaging material with one or more layers of PP film material, although the compression resistance of the packaging material is improved, the air permeability of the packaging material will decrease. When the above packaging material is used for products with high air permeability requirements, the poor air permeability of the packaging material will affect the quality of the product, especially the shelf life of the product.

[0004] Therefore, it is necessary to find a packaging material that has both air permeability and pressure resistance to meet the requirements of products with high air permeability requirements for their packaging materials. Summary of the invention

[0005] The present application provides a highly air-permeable packaging material and its application in the production of agricultural microbial agents. The packaging material provided in the present application has good air permeability and can be used to package agricultural microbial agents, especially to package agricultural microbial agents containing aerobic bacteria and microaerobic bacteria that have high storage air permeability requirements, thereby effectively improving the shelf life of microbial agent products.

[0006] In order to ensure both air permeability and pressure resistance, the packaging material provided by the present application is composed of 3-5 layers of PE film as the inner layer and PP film material as the outer layer. In the preparation of the above packaging material, it is necessary to punch holes in the PP film material in advance, with the hole spacing between 0.5-2 cm. At the same time, the outer layer and the inner layer are compounded by the glue dispensing method, glue is dispensed at the position without holes, and no glue is applied at the position with holes, so as to ensure the air permeability of the packaging material to the greatest extent.

[0007] In a first aspect, the present application provides a highly air-permeable packaging material, which adopts the following technical solution:

[0008] A highly air-permeable packaging material, comprising an inner layer of a PE film material composed of several layers of PE films and an outer layer of a PP film material;

[0009] The PP film material is provided with ventilation holes;

[0010] The inner layer of the PE film material and the outer layer of the PP film material are bonded by glue spotting; the locations of the glue spots are evenly arranged at the non-porous locations of the PP film material.

[0011] Optionally, the PE film is prepared by co-extrusion.

[0012] Optionally, the number of the PE films is 3-5 layers.

[0013] Optionally, the spacing between the ventilation holes is 0.5-2 cm.

[0014] Optionally, the spacing between the ventilation holes is 1-1.5 cm.

[0015] In a second aspect, the present application provides the use of the above-mentioned highly air-permeable packaging material in the production of agricultural microbial agents.

[0016] In summary, the present application includes at least one of the following beneficial technical effects:

[0017] The packaging material provided in the present application has good air permeability and can be used to package agricultural microbial agents, especially to package agricultural microbial agents containing aerobic bacteria and microaerobic bacteria that have high storage permeability requirements, thereby effectively improving the shelf life of the microbial agent products.

[0018] The present invention can realize the air permeability of the packaging material from 900cm to 1000cm by punching holes in the outer layer of the PP film material and combining the inner layer of the PE film material and the outer layer of the PP film material by using the dispensing method. 3 / (㎡·24h·0.1MPa) increased to 3000cm 3 / (㎡·24h·0.1MPa), which increases the air permeability by more than 3 times, effectively ensures the respiration of microorganisms in the bagged bacterial agent, reduces the mortality rate of microorganisms, increases the survival rate of microorganisms, and extends the shelf life of the bacterial agent products.

[0019] At the same time, the compressive strength of the bagged products is also guaranteed. The bags can withstand a pressure of more than 780N without breaking, thus meeting the requirements of packaging and transportation. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 The PE film material is prepared by co-extrusion of the 3-layer 12-filament PE film of Comparative Example 1.

[0021] Figure 2 The material is a composite material of a PE film material and a PP film material prepared by co-extrusion of the 3-layer 12-filament PE film of Comparative Example 2.

[0022] Figure 3 This is the highly air-permeable packaging material provided in Example 1 of the present application. DETAILED DESCRIPTION

[0023] Before describing the embodiments of the present application in detail, it should be understood that the terms used herein are only used for the purpose of describing specific embodiments. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those generally understood by ordinary technicians in the field to which the terms belong.

[0024] It should be noted that the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. Further, in the description of this application, unless otherwise specified, the meaning of "plurality" is two or more.

[0025] The endpoints and any values ​​of the ranges disclosed in this application are not limited to the precise ranges or values, and these ranges or values ​​should be understood to include values ​​close to these ranges or values. For numerical ranges, the endpoint values ​​of each range, the endpoint values ​​of each range and the individual point values, and the individual point values ​​can be combined with each other to obtain one or more new numerical ranges, which should be considered as specifically disclosed in this article.

[0026] In the present application, the terms "comprise" or "include" are open expressions, that is, including the contents specified in the present application but not excluding other contents.

[0027] The present application provides a highly air-permeable packaging material. The highly air-permeable packaging material comprises an inner layer of a PE film material composed of several layers of PE films and an outer layer of a PP film material. The PP film material is provided with ventilation holes. In addition, the inner layer of the PE film material and the outer layer of the PP film material are bonded by glue dispensing. The locations of the glue dispensing are evenly arranged at the non-porous locations of the PP film material. The PE film is prepared by co-extrusion. The number of PE films is 3-5 layers. The spacing between the ventilation holes is 0.5-2 cm.

[0028] In order to make the purpose, technical scheme and advantages of the present application clearer, the technical scheme in the embodiments of the present application will be clearly and completely described below. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without making creative work belong to the scope of protection of the present application. The embodiments described below are exemplary and are only used to explain the present application, and cannot be interpreted as limiting the present application.

[0029] If no specific techniques or conditions are specified in the examples, the techniques or conditions described in the literature in the field or the product instructions are used. If no manufacturer is specified for the reagents or instruments used, they are all conventional products that can be purchased commercially.

[0030] The present application is further described in detail below in conjunction with the embodiments and test results.

[0031] Example 1

[0032] This embodiment provides a highly air-permeable packaging material.

[0033] like Figure 3 As shown, the packaging material is a composite material of a PE film material prepared by co-extrusion of 3 layers of 12-filament PE films and a PP film material. The PP film material is provided with ventilation holes, and the hole spacing is 1 cm. In addition, the inner layer of the PE film material and the outer layer of the PP film material are bonded by a glue dispensing method, and the glue dispensing positions are evenly set at the non-porous positions of the PP film material.

[0034] Example 2

[0035] This embodiment provides a highly air-permeable packaging material. The difference between this air-permeable packaging material and embodiment 1 is that the spacing between the air holes is 0.5 cm. The rest is the same as embodiment 1.

[0036] Example 3

[0037] This embodiment provides a highly air-permeable packaging material. The difference between this air-permeable packaging material and embodiment 1 is that the spacing between the air holes is 1.25 cm. The rest is the same as embodiment 1.

[0038] Example 4

[0039] This embodiment provides a highly air-permeable packaging material. The difference between this air-permeable packaging material and embodiment 1 is that the spacing between the air holes is 1.5 cm. The rest is the same as embodiment 1.

[0040] Example 5

[0041] This embodiment provides a highly air-permeable packaging material. The difference between this air-permeable packaging material and embodiment 1 is that the spacing between the air holes is 2.0 cm. The rest is the same as embodiment 1.

[0042] Comparative Example

[0043] Comparative Example 1

[0044] This comparative example provides a packaging material.

[0045] The packaging material is a PE film material prepared by co-extrusion of a 3-layer 12-filament PE film.

[0046] Comparative Example 2

[0047] This comparative example provides a packaging material.

[0048] The packaging material is a composite material of a PE film material prepared by co-extrusion of a 3-layer 12-filament PE film and a PP film material, wherein the PP film material and the PE film material are connected by co-extrusion.

[0049] Comparative Example 3

[0050] This comparative example provides a packaging material.

[0051] The packaging material is a composite material of a PE film material prepared by co-extrusion of a 3-layer 12-filament PE film and a PP film material, wherein the PP film material and the PE film material are connected by co-extrusion, and the PP film material is provided with ventilation holes with a hole spacing of 1 cm.

[0052] Comparative Example 4

[0053] This comparative example provides a packaging material.

[0054] The packaging material is a composite material of a PE film material prepared by co-extrusion of a 3-layer 12-filament PE film and a PP film material. The inner PE film material and the outer PP film material are bonded by a glue dispensing method, and the distance between the glue dispensing positions on the PP film material is 1 cm.

[0055] Performance test results

[0056] (I) The thickness, air permeability and pressure resistance of the highly air permeable packaging materials provided in the above embodiments and the packaging materials of the comparative examples were tested respectively.

[0057] The test method for air permeability refers to GB / T 1038.1-2022 Test method for gas permeability of plastic films and sheets. The test method for compressive resistance refers to GB18454 Liquid food packaging bag pressure resistance test, which is as follows: the liquid volume is 30-150ml / bag, the internal pressure is maintained at 20kPa for 2 minutes, and the bag breaking pressure is tested, requiring no leakage or rupture.

[0058] The test results are shown in Table 1.

[0059] Table 1 Test results of embodiments and comparative examples

[0060]

[0061] It can be seen from Table 1 that the packaging material provided in this application has good air permeability.

[0062] (ii) The rhizobia product with an initial rhizobia count of 10 billion was packaged using the highly air-permeable packaging material provided in the above embodiment and the packaging material of the comparative example, and stored at room temperature. The number of rhizobia in the product was checked at different times. At the same time, an airtight packaging material was used as a control.

[0063] The test results are shown in Table 2.

[0064] Table 2 Test results of products packaged with different packaging materials at different storage times

[0065]

[0066]

[0067] As shown in Table 2, the highly air-permeable packaging material provided by the present application is used to package agricultural microbial agents containing aerobic bacteria and microaerobic bacteria that have high storage air permeability requirements, thereby effectively improving the shelf life of the microbial agent products. Compared with developing other protective means or screening other protective agents, the packaging material provided by the present application has a short development cycle, good effect, and low cost.

[0068] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example" or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0069] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A highly air-permeable packaging material, characterized in that: The highly air-permeable packaging material comprises an inner layer of a PE film material composed of several layers of PE films and an outer layer of a PP film material; The PP film material is provided with ventilation holes; The inner layer of the PE film material and the outer layer of the PP film material are bonded by glue spotting; the locations of the glue spots are evenly arranged at the non-porous locations of the PP film material.

2. The highly air-permeable packaging material according to claim 1, characterized in that: The PE film is prepared by co-extrusion.

3. The highly air-permeable packaging material according to claim 1, characterized in that: The number of the PE films is 3-5 layers.

4. The highly air-permeable packaging material according to claim 1, characterized in that: The spacing between the ventilation holes is 0.5-2 cm.

5. The highly air-permeable packaging material according to claim 1, characterized in that: The spacing between the ventilation holes is 1-1.5 cm.

6. Use of the highly air-permeable packaging material according to any one of claims 1 to 5 in the production of agricultural microbial agents.

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