Universal easy-to-uncover sealing film and preparation method thereof

Abstract

The invention provides a universal easy-to-uncover sealing film which comprises a printing layer, a barrier layer, a bonding layer and a heat sealing layer, the printing layer and the heat sealing layer are bonded on the barrier layer through the bonding layer, and the heat sealing layer comprises the following components in parts by mass: 40-60 parts of POE, 20-40 parts of EVA, 10-30 parts of ionomer resin, 10-30 parts of a nano composite additive and 0.6-3 parts of a modified additive. The invention further provides a preparation method of the universal sealing film easy to uncover. Compared with the prior art, the problem that an existing sealing film is not easy to uncover can be solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the packaging box technical field, specifically to a general easy-to-open sealing film and a preparation method thereof. BACKGROUND

[0002] With the increasing technology of food processing and production, the types of food are also increasing. Therefore, according to the storage requirements of different foods, some foods need to be stored in barrel-shaped or cup-shaped containers. Therefore, a sealing film is needed to seal the opening of the container to prolong the storage time of the food.

[0003] However, many sealing films on the market often cause the sealing film to be difficult to tear open when people open such packaging due to different materials or rough surfaces of the container opening, etc. Sometimes, people even have to use a knife to pierce the sealing film to open it, which directly causes trouble for people to eat food. Therefore, it is necessary to improve the sealing film. SUMMARY

[0004] The purpose of the present application is to solve the problem of the existing sealing film not easy to open, and to provide a general easy-to-open sealing film and a preparation method thereof.

[0005] In order to achieve the above-mentioned purpose, on the one hand, the present application provides a general easy-to-open sealing film, which comprises a printing layer, a barrier layer, an adhesive layer and a heat-sealing layer, the printing layer and the heat-sealing layer are bonded on the barrier layer through the adhesive layer, and the heat-sealing layer comprises 40-60 parts by mass of POE, 20-40 parts by mass of EVA, 10-30 parts by mass of ionomer resin, 10-30 parts by mass of nano-composite additive and 0.6-3 parts by mass of modified additive.

[0006] As a further description of the above technical solution:

[0007] The heat-sealing layer comprises 50 parts by mass of POE, 30 parts by mass of EVA, 20 parts by mass of ionomer resin, 15 parts by mass of nano-composite additive and 2 parts by mass of modified additive.

[0008] As a further description of the above technical solution:

[0009] The modified additive is one or more of silicone master batch and nano-talc powder.

[0010] As a further description of the above technical solution:

[0011] The printing layer is a biaxially oriented polypropylene film, and the barrier layer is an aluminum foil layer.

[0012] As a further description of the above technical solution:

[0013] The nanocomposite additive is composed of PE and nanoclay, and the ratio of the PE and nanoclay is 1:1.

[0014] As a further description of the above technical solution:

[0015] The adhesive layer is a polyurethane layer or a water-based acrylic glue.

[0016] As a further description of the above technical solution:

[0017] The heat-sealing layer is prepared by uniformly mixing the POE, EVA, ionomer resin, nanocomposite additive and modified additive, then melting under the condition of an extrusion pressure of 30-60 Mpa, and then blow molding by a blow molding device.

[0018] In another aspect, the application further provides a preparation method of the universal easy-to-open sealing film, which comprises the following steps:

[0019] S1: coating an adhesive on the surface of the barrier layer, and naturally cooling or drying the adhesive to form an adhesive layer on the barrier layer;

[0020] S2: hot-pressing the printing layer and the adhesive layer together at 60-85°C;

[0021] S3: coating an adhesive on the other surface of the barrier layer, and naturally cooling or drying the adhesive to form an adhesive layer on the barrier layer;

[0022] S4: hot-pressing the heat-sealing layer and the adhesive layer together at 60-85°C to obtain a blank film;

[0023] S5: aging the obtained blank film at 45-65°C for ≥90h to obtain a sealing film.

[0024] As a further description of the above technical solution:

[0025] In step 2, the printing layer is printed on the biaxially stretched polypropylene film to form a printing layer before being bonded.

[0026] In conclusion, by adopting the technical scheme, the application has the advantages that the sealing film prepared by the application is composed of a printing layer, a barrier layer, an adhesive layer and a heat-sealing layer, the printing layer provides surface printing and scratch resistance, the barrier layer is an aluminum foil layer, which can block oxygen and moisture and improve the sealing performance, the main components of the heat-sealing layer are POE, EVA, ionomer resin, nano-composite additive and modified additive, POE has high flexibility, is easy to tear and has stable heat-sealing performance, EVA has better low-temperature peelability, the ionomer resin can achieve the effect of brittle tearing, the modified additive can reduce the surface friction coefficient, improve the peeling smoothness, prevent the film layers from adhering to each other, improve the opening property, and the nano-composite additive can improve the barrier property, so that the sealing performance of the sealing film can be further improved. DETAILED DESCRIPTION

[0027] The preferred embodiments of the application will be described in detail below.

[0028] Embodiment one

[0029] The application provides a general-purpose easy-to-peel sealing film, which comprises a printing layer, a barrier layer, an adhesive layer and a heat-sealing layer, the printing layer and the heat-sealing layer are bonded to the barrier layer through the adhesive layer, and the heat-sealing layer comprises 50 parts of POE, 30 parts of EVA, 20 parts of ionomer resin, 15 parts of nano-composite additive and 2 parts of modified additive in terms of mass fraction.

[0030] The modified additive is one or more of silicone master batch and nano-talcum powder, and specifically is a mixture of silicone master batch and nano-talcum powder, which can reduce the surface friction coefficient, improve the peeling smoothness, prevent the film layers from adhering to each other and improve the opening property.

[0031] The printing layer is a biaxially stretched polypropylene film, and the barrier layer is an aluminum foil layer, which can improve the sealing property and prevent air from entering the container of the packaged food.

[0032] The nano-composite additive is composed of PE and nano-clay, and the ratio of the PE to the nano-clay is 1:1, which can improve the barrier property and reduce the oxygen transmission rate by 30-50%.

[0033] The adhesive layer is a polyurethane layer or a water-based acrylic adhesive.

[0034] The heat-sealing layer is prepared by uniformly mixing the POE, EVA, ionomer resin, nano-composite additive and modified additive, melting and extruding under the condition of an extrusion pressure of 30-60 Mpa, and then blow molding by a blow molding device.

[0035] A preparation method of a general-purpose easy-to-peel sealing film, which comprises the following steps:

[0036] S1: coating adhesive on the surface of the barrier layer, and allowing the adhesive to form an adhesive layer on the barrier layer after natural cooling or drying;

[0037] S2: hot-pressing the printing layer and the adhesive layer together at 60-85°C;

[0038] S3: coating adhesive on the other side of the barrier layer, and allowing the adhesive to form an adhesive layer on the barrier layer after natural cooling or drying;

[0039] S4: hot-pressing the heat-sealing layer and the adhesive layer together at 60-85°C to obtain a blank film;

[0040] S5: aging the obtained blank film at 45-65°C for ≥90h to obtain a sealing film.

[0041] In step 2, the printing layer is formed by printing the biaxially stretched polypropylene film before bonding. The printing of the biaxially stretched polypropylene film before compounding can reduce the loss.

[0042] According to the above technical scheme, the sealing film prepared by the present application is composed of a printing layer, a barrier layer, an adhesive layer and a heat-sealing layer. The printing layer provides surface printing and scratch resistance. The barrier layer is an aluminum foil layer, which can block oxygen and moisture and improve the sealing performance. The main components of the heat-sealing layer are POE, EVA, ionomer resin, nano-composite additive and modified additive. POE has high flexibility, easy tearing and stable heat-sealing performance. EVA has good low-temperature easy-to-uncover performance. Ionomer resin can achieve brittle tearing effect. Modified additive can reduce the surface friction coefficient, improve the peeling smoothness, prevent film layer adhesion, improve the opening property, and nano-composite additive can improve the barrier property, thereby further improving the sealing performance of the sealing film.

[0043] Based on the preparation method of example one, the following table shows examples two to four, comparative example one and comparative example three:

[0044]

[0045] Meanwhile, according to the detection standard GB / T10004-2008, the thickness of the sealing film is 8μm, and the following table shows the results of examples one to four, comparative example one and comparative example three:

[0046]

[0047] Firstly, the mechanical test results of the sealing film of the present application all meet the relevant standards of GB / T10004-2008, and secondly, according to the examples and comparative examples, it can be clearly seen that the overall tensile strength is obviously improved after adding ionomer resin in the present application, which can effectively avoid the sealing film from being torn when the package is unpacked, thereby ensuring the convenience of taking food.

[0048] In addition, the sealing films in Examples 1 to 4 and Comparative Examples 1 to 3 are respectively sealed with food, and the food in Comparative Example 3 is damaged first in the same environment, and the remaining food has the same storage time. The addition of the nano-composite additive in the present application can improve the sealing effect of the sealing film.

[0049] The above is only the preferred specific implementation of the present application, but the protection scope of the present application is not limited to this, any skilled person in the art can make equivalent replacement or change according to the technical scheme and the inventive concept of the present application within the technical range disclosed by the present application, which should be covered in the protection scope of the present application.

Claims

1. A general-purpose easy-to-open sealing film, characterized by comprising: The printing layer and the heat-sealing layer are both bonded on the barrier layer through the adhesive layer, and the heat-sealing layer comprises 40-60 parts of POE, 20-40 parts of EVA, 10-30 parts of ionomer resin, 10-30 parts of nano-composite additive and 0.6-3 parts of modified additive by mass fraction.

2. The universal easy-to-open closure of claim 1, wherein, The heat-sealing layer comprises 50 parts of POE, 30 parts of EVA, 20 parts of ionomer resin, 15 parts of nano-composite additive and 2 parts of modified additive by mass fraction.

3. The universal easy open closure membrane according to claim 1, wherein, The modified additive is one or more of silicone master batch and nano-talcum powder.

4. The universal easy open closure membrane according to claim 1, wherein, The printing layer is biaxially oriented polypropylene film, and the barrier layer is aluminum foil layer.

5. The universal easy open closure membrane according to claim 1, wherein, The nano-composite additive is composed of PE and nano-clay, and the ratio of the PE to the nano-clay is 1:

1.

6. The universal easy open closure membrane according to claim 1, wherein, The adhesive layer is polyurethane layer or water-based acrylic glue.

7. The universal easy open closure membrane according to claim 1, wherein The heat-sealing layer is prepared by uniformly mixing the POE, EVA, ionomer resin, nano-composite additive and modified additive, melting under heating, and blowing and molding by blowing equipment under an extrusion pressure of 30-60 Mpa.

8. A method of manufacturing a general-purpose easy-to-open sealant film, characterized by comprising: The method comprises the following steps: S1: coating adhesive on the surface of the barrier layer, and naturally cooling or drying the adhesive to form an adhesive layer on the barrier layer; S2: hot-pressing the printing layer and the adhesive layer together at 60-85°C; S3: coating adhesive on the other side of the barrier layer, and naturally cooling or drying the adhesive to form an adhesive layer on the barrier layer; S4: hot-pressing the heat-sealing layer and the adhesive layer together at 60-85°C to obtain a blank film; S5: aging the obtained blank film at 45-65°C for ≥90h to obtain a sealing film.

9. The method for preparing a universal easy-open sealing film according to claim 8, characterized in that, In step 2, the biaxially oriented polypropylene film is printed to form a printing layer before being bonded.

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