A double-layer packaging bag for corn

Abstract

The utility model proposes a double-layer packaging bag for corn, comprising an inner bag and an outer bag, wherein the inner bag is located inside the outer bag, the area between the inner bag and the outer bag is a vacuum area, the corn is located inside the inner bag and the inner bag is vacuumed, the inner bag comprises an outer first nylon layer and an inner polypropylene film layer, and the polypropylene film layer is bonded to the inner wall of the first nylon layer; the utility model has a simple design structure, firstly uses the inner bag to package the corn, and then the outer bag is arranged outside the inner bag after the inner bag containing the corn is steamed, so that the effect of using conventional materials to package the corn is achieved, and the purpose of long-term preservation of the corn can be achieved through double-layer packaging, and compared with the existing packaging bags using high-barrier nylon materials, the utility model has the advantages of low cost, good barrier properties and long shelf life of corn.

Description

Technical Field

[0001] The utility model relates to the technical field of packaging bag design, in particular to a double-layer packaging bag for corn. Background Art

[0002] The nutritional value of corn is very high, which is very beneficial to human health and suitable for all people. Therefore, corn has become a common food on the table, especially boiled corn, which is sweet and delicious, with less loss of nutrients, and has become the most common way of eating. In addition to the conventional method of making boiled corn at home, in order to extend the shelf life of corn, the peeled and cooked corn is usually quickly sterilized and packed into a plastic wrap or a packaging bag for packaging. After packaging, it is sterilized together with the packaging bag and heated again when eaten. Common plastic wraps include polyethylene films, etc. Polyethylene films are widely used due to their abundant raw materials and low prices, but they have the problem of poor barrier properties. In order to improve the barrier properties, the Chinese utility model patent with application number CN201720140659.6 discloses a transparent and soft high-barrier corn bag, wherein the inner layer of the corn bag body is a polypropylene film, and the outer layer of the corn bag body is a high-barrier nylon film, and the high-barrier nylon film is bonded to the polypropylene film by an adhesive. This solution uses high-barrier nylon film as a high-barrier material to package corn, which can keep the corn fresh for a long time. However, on the one hand, since this high-barrier nylon film material needs to be purchased from an exclusive foreign supplier, it has the disadvantages of long delivery cycle, high price and difficulty in purchasing. On the other hand, since the corn packaging bag has a single-layer structure, there is a problem that the packaging bag is easily damaged and the shelf life of the corn is short. Utility Model Content

[0003] The utility model provides a double-layer packaging bag for corn, so as to solve the problems of the existing corn packaging bags proposed in the above background technology, such as high price, long delivery cycle, difficulty in purchase and short shelf life of corn.

[0004] The technical solution of the utility model is achieved in this way:

[0005] A double-layer packaging bag for corn comprises an inner bag and an outer bag, wherein the inner bag is located inside the outer bag, the area between the inner bag and the outer bag is a vacuum area, the corn is located inside the inner bag and the inner bag is vacuumed, the inner bag comprises an outer first nylon layer and an inner polypropylene film layer, and the polypropylene film layer is bonded to the inner wall of the first nylon layer.

[0006] Preferably, the outer bag comprises, from outside to inside, a second nylon layer, a polyester film layer and a polyethylene film layer, the second nylon layer and the polyester film layer are bonded to each other, and the polyester film layer and the polyethylene film layer are bonded to each other.

[0007] Preferably, the surface of the polyester film layer is also coated with an aluminum dioxide coating, and the aluminum dioxide coating is close to one side of the second nylon layer.

[0008] Preferably, the inner bag is a transparent bag, and the surface of the outer bag has a printed pattern.

[0009] By adopting the above technical solution, the beneficial effects of the utility model are as follows:

[0010] The utility model has a simple design structure. The corn is first packaged in an inner bag. The inner bag containing the corn is steamed and then an outer bag is arranged outside the inner bag. This not only achieves the effect of packaging the corn with conventional materials, but also can achieve the purpose of keeping the corn fresh for a long time through double-layer packaging. Compared with the existing packaging bags made of high-barrier nylon materials, this utility model has the advantages of low cost, good barrier properties and long shelf life of corn. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0012] Figure 1 It is a schematic diagram of the structure of the utility model;

[0013] Figure 2 It is a cross-sectional view of the utility model;

[0014] Figure 3 It is a cross-sectional view of the inner bag of the utility model;

[0015] Figure 4 It is a cross-sectional view of the outer bag of the utility model.

[0016] in:

[0017] 1. Inner bag; 101. First nylon layer; 102. Polypropylene film layer;

[0018] 2. Outer bag; 201. Second nylon layer; 202. Polyester film layer; 203. Aluminum dioxide coating; 204. Polyethylene film layer. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0020] As shown in the figure, a double-layer packaging bag for corn includes an inner bag 1 and an outer bag 2, wherein the inner bag 1 is located inside the outer bag 2, and the area between the inner bag 1 and the outer bag 2 is a vacuum area. The corn is located inside the inner bag 1 and the inner bag 1 is vacuumed. The inner bag 1 includes an outer first nylon layer 101 and an inner polypropylene film layer 102, and the polypropylene film layer 102 is bonded to the inner wall of the first nylon layer 101, that is, the polypropylene film layer 102 is in contact with the corn during actual use.

[0021] Specifically, the outer bag 2 includes a second nylon layer 201, a polyester film layer 202 and a polyethylene film layer 204 from outside to inside. The second nylon layer 201 and the polyester film layer 202 are bonded to each other, and the polyester film layer 202 and the polyethylene film layer 204 are bonded to each other.

[0022] That is, the inner bag 1 and the outer bag 2 are both packaged in a vacuum manner, and the first nylon layer 101 of the inner bag 1 and the second nylon layer 201 of the outer bag 2 are both made of ordinary nylon material, which is easier to obtain and has low cost compared to the high barrier nylon material in the prior art, greatly shortening the processing cycle.

[0023] Specifically, the surface of the polyester film layer 202 is also coated with an aluminum dioxide coating 203, and the aluminum dioxide coating 203 is close to one side of the second nylon layer 201. Its purpose is to combine the advantages of polyester film and aluminum dioxide to provide a material with high barrier properties and high mechanical strength, and has the characteristics of tear resistance and puncture resistance. It can avoid damage to the packaging bag and extend the shelf life of corn.

[0024] Specifically, the inner bag 1 is a transparent bag, and the surface of the outer bag 2 has a printed pattern. Traditional, single-layer corn packaging bags are usually transparent bags and do not have the function of printing patterns. The outer bag 2 in this example can be printed with patterns, so that consumers can easily view relevant information about the product.

[0025] The production process of this double-layer packaging bag is as follows: after the corn is packed and vacuumized in the inner bag 1, the corn and the inner bag 1 are steamed as a whole to sterilize the corn and obtain cooked corn, and then the outer bag 2 is vacuum packed to improve the barrier property of the entire packaging bag and extend the shelf life of the corn. According to actual use, the inner bag 1 is used in combination with corn steaming and the outer bag 2 is not steamed, and the shelf life of the traditional 90-day corn can be extended to 120 days while obtaining the finished corn.

[0026] The following is a comparison table of the barrier properties of three types of packaging bags: ordinary single-layer packaging bags, high-barrier nylon packaging bags (divided into exclusive and non-exclusive types), and inner bags combined with outer bags in this example:

[0027] Barrier (oxygen permeability) comparison, unit: cm 3 / (㎡×24h×0.1MPa)

[0028]

[0029] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A double-layer packaging bag for corn, characterized in that: The invention comprises an inner bag (1) and an outer bag (2), wherein the inner bag (1) is located inside the outer bag (2), the area between the inner bag (1) and the outer bag (2) is a vacuum area, the corn is located inside the inner bag (1) and the inner bag (1) is subjected to vacuum treatment, the inner bag (1) comprises an outer first nylon layer (101) and an inner polypropylene film layer (102), and the polypropylene film layer (102) is bonded to the inner wall of the first nylon layer (101).

2. A double-layer packaging bag for corn according to claim 1, characterized in that: The outer bag (2) comprises, from the outside to the inside, a second nylon layer (201), a polyester film layer (202) and a polyethylene film layer (204), the second nylon layer (201) and the polyester film layer (202) being bonded to each other, and the polyester film layer (202) and the polyethylene film layer (204) being bonded to each other.

3. A double-layer packaging bag for corn according to claim 2, characterized in that: The surface of the polyester film layer (202) is also plated with an aluminum dioxide coating (203), and the aluminum dioxide coating (203) is close to one side of the second nylon layer (201).

4. A double-layer packaging bag for corn according to claim 1, characterized in that: The inner bag (1) is a transparent bag, and the surface of the outer bag (2) has a printed pattern.

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