Large cup cover film capable of meeting access requirements and production process thereof

Abstract

The invention belongs to the technical field of packaging, and particularly relates to a large cup cover film capable of meeting passage requirements and a production process of the large cup cover film. The cover film comprises a cover film body sealed with a polypropylene cup body, wherein the cover film body is formed by dry compounding of an NY printing film and a polyethylene film; the polyethylene film comprises a corona layer, a middle layer and a heat sealing layer which are connected in sequence, and the heat sealing layer is connected with the polypropylene cup body; the corona layer is composed of first linear low-density polyethylene, the middle layer is composed of first linear low-density polyethylene and metallocene low-density polyethylene, and the heat sealing layer is composed of an ethylene-octene copolymer, low-density polyethylene, an anti-blocking agent and a slipping agent. After the prepared cover film is compounded with a PP cup body, not only can the requirements of processing performance and uncovering performance be met, but also the good impact resistance and falling resistance are achieved, the requirement of a large cup cover film passage can be met, and the cup leakage phenomenon does not occur in the passage process.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of packaging, in particular to a large cup cover film capable of meeting the requirements of the channel and a production process thereof. BACKGROUND

[0002] With the continuous change of people's consumption habits, people's demand for packaged bulk leisure food is rising. Some jelly products are packaged in PP cups and sealed with cover film materials before being sold on the market. Consumers can directly eat after opening the cover film material. Such cover film materials and PP cups need to be opened by consumers and have a certain heat sealing strength with the PP cup to meet the requirements of the channel and cannot have the problem of broken package.

[0003] At present, the content of jelly products with a large weight of 1 kg or more is packaged with a cover film, and the consumer can eat after opening it. However, during the process of channel and logistics, the content will impact the cover film material of the sealed cup body. The existing cover film material is generally 15uNY / 25uPE / extruded 35uEVA resin, and the sealing strength after sealing with the PP cup is generally between 15-25N / 15mm. For products with a weight of 1 kg or more, the sealing strength and drop resistance are required to be higher due to the large weight of the content. The cover film material of this type will be continuously impacted by the content during the channel process, causing the cover film and the cup body to be loose, and a certain number of broken cups will occur, resulting in product damage, food safety, inedibility, and impact on brand image.

[0004] This is due to the use of extruded EVA resin in the inner layer. EVA resin, i.e. ethylene-vinyl acetate copolymer, has a direct relationship between its melting point and the content of vinyl acetate (VA). Generally, the EVA resin used in jelly cover film is melted after heating. The EVA layer is first melted into a viscous state. Under the action of pressure, the melted EVA penetrates into the plastic edge of the cup opening. Due to the large difference in chemical structure between EVA and PP, the molecular chains cannot diffuse and entangle to form a firm blend interface, but EVA resin can infiltrate the PP cup opening surface like "glue", and form mechanical interlocking after cooling and solidification. The VA content of the EVA resin on the market is generally about 25%, and the melting point is about 85C to 100℃, and the melting index is about 8g / 10min. Therefore, during the sealing and stamping sealing process, the high melting index leads to strong fluidity, and the heat sealing thickness of the cup body during high temperature and high pressure sealing is thinned, and the thickness is uneven, resulting in uneven heat sealing strength, and the low heat sealing strength of the cup body will cause the problem of broken cup. SUMMARY

[0005] In order to solve the above technical problems, the present application provides a large cup cover film capable of meeting the requirements of pass-through and a production process thereof, which can meet the requirements of consumers and withstand the impact and drop requirements during pass-through, thereby avoiding the occurrence of broken cup phenomenon.

[0006] In order to achieve one of the purposes of the present application, the present application adopts the following technical solutions:

[0007] A large cup cover film capable of meeting the requirements of pass-through, comprising a cover film body sealed with a polypropylene cup body, wherein the cover film body is formed by dry compounding of an NY printing film and a polyethylene film; the polyethylene film comprises a corona layer, an intermediate layer and a heat-sealing layer connected in sequence, and the heat-sealing layer is connected with the polypropylene cup body; the corona layer is composed of first linear low-density polyethylene, the intermediate layer is composed of first linear low-density polyethylene and metallocene low-density polyethylene, and the heat-sealing layer is composed of ethylene-octene copolymer, low-density polyethylene, opening agent and slip agent.

[0008] Preferably, the intermediate layer is composed of 75 parts by mass of first linear low-density polyethylene and 25 parts by mass of metallocene low-density polyethylene, and the heat-sealing layer is composed of 65 parts by mass of ethylene-octene copolymer, 32.8 parts by mass of low-density polyethylene, 1 part by mass of opening agent and 1.2 parts by mass of slip agent.

[0009] Preferably, the first linear low-density polyethylene is of the brand 7047 produced by Zhejiang Petrochemical Company, the metallocene low-density polyethylene is of the brand 3505MC produced by Exxon Company, the ethylene-octene copolymer is of the brand PF0101KE produced by Ineos Company, the low-density polyethylene is of the brand 150BW produced by Yangba Petrochemical Company, the opening agent is of the brand AB-20LD produced by Aaron Company, and the slip agent is of the brand 10090-K produced by Anpiaosi Company.

[0010] Preferably, the first linear low-density polyethylene has a density of 0.912 g / cm 3 and a melt flow rate of 1 g / 10 min, and the metallocene low-density polyethylene has a density of 0.925 g / cm 3 and a melt flow rate of 0.5 g / 10 min.

[0011] Preferably, the ethylene-octene copolymer has a melting point of 80-110°C.

[0012] Preferably, the thickness ratio of the NY printing film to the polyethylene film is 1:4.

[0013] Preferably, the thickness of the NY printing film is 15 um, and the thickness of the ethylene film is 60 um.

[0014] Preferably, the thickness ratio of the corona layer, the intermediate layer and the heat sealing layer is 24.4%, 51.4% and 24.2% respectively.

[0015] Preferably, the NY printed film is prepared by printing process on the NY film.

[0016] To achieve the second object of the present application, the present application provides a production process of the large cup cover film meeting the channel requirements, which comprises the following steps:

[0017] S1, printing process: preparing NY printed film by printing process on NY film;

[0018] S2, according to the resin raw material formula, adding the corona layer resin raw material, the intermediate layer resin raw material and the heat sealing layer resin raw material into the three barrels of the film blowing machine respectively; cooling and setting after film blowing of the raw materials in the three barrels, and then performing corona treatment on the surface of the set film to obtain a polyethylene film;

[0019] S3, preparing cover film by dry compounding the NY printed film and the polyethylene film.

[0020] The present application has the following beneficial effects compared with the prior art:

[0021] (1) After the cover film material and the large volume PP cup body are sealed, the cover film material and the cup body have excellent heat sealing performance, excellent impact resistance and dropping performance, and can meet the requirements in the complex channel process. When the heat sealing interface is impacted and dropped by the large weight content, the cover film material and the cup body are well heat sealed, the problem of broken cup is avoided, the consumer can easily tear the cover film, and the brand image of the product is protected.

[0022] (2) The polyethylene film of the present application uses film blowing process. Generally, low melt index resin with a melt index of about 1-2 is used in this process. Compared with high melt index resin, the flowability is relatively weak when the heat sealing is pressed by the sealing knife, and the thickness at the sealing position decreases very little, so it can provide excellent heat sealing strength. The special ethylene-octene copolymer resin (POP) is selected for the heat sealing layer. After heating, it can meet the requirements of dropping and impact resistance during channeling while meeting the requirements of being easily peeled off.

[0023] (3) The corona layer of the present application uses 100% of the first linear low density polyethylene, which does not contain any additives, and has a density of 0.912 g / cm 3 , good stiffness and excellent compounding strength, and a melt flow rate of 1 g / 10 min, so the flowability of the resin is relatively small at a certain sealing temperature.

[0024] The intermediate layer uses 75% of the first linear low density polyethylene, which does not contain any additives, and has a density of 0.912 g / cm3 which has good stiffness and excellent composite strength, 25% of metallocene low-density polyethylene is added, the density is 0.925 g / cm 3 , the melt flow rate is 0.5 g / 10 min, which can provide good toughness and impact resistance for the film.

[0025] The heat-sealing layer uses a special POP resin of INEOS, which is a special ethylene-octene copolymer, has the characteristics of low melting point, high flexibility, excellent thermal adhesion and heat-sealing performance, because the melting point is relatively low (about 80-110 DEG C), it will melt into a viscous flow state at a certain temperature, forming a "hot melt adhesive" layer, at this time, the surface layer of the PP cup mouth softens (not completely melted) at high temperature, the molecular chain activity is enhanced. The molten POP molecular chain and the softened PP molecular chain penetrate and diffuse each other at the interface, the interdiffused molecular chains are tightly entangled during the cooling and solidification process, forming a physical crosslinking network, the molten POP resin fills the small concave and convex of the surface of the PP cup mouth under pressure, so that the resin and the PP cup body form high-strength heat-sealing performance. In order to improve the processing performance of the film, 32.8% of low-density polyethylene LDPE is also used, which can improve the processing performance of the film. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 is the flowchart of the present application. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical scheme and advantages of the present application more clear and explicit, the present application is further described in detail below in combination with the drawings and examples, all other examples obtained by the person skilled in the art without creative labor based on the examples in the present application belong to the protection scope of the present application.

[0028] Example 1

[0029] A production process of a large cup cover film meeting the channel requirements, the production process comprises the following steps:

[0030] S1, printing process: NY film is prepared by printing process to obtain NY printed film;

[0031] S2, 100 parts by mass of the first linear low-density polyethylene is weighed as the resin raw material of the corona layer; 75 parts by mass of the first linear low-density polyethylene and 25 parts by mass of the metallocene low-density polyethylene are weighed as the resin raw material of the intermediate layer; 65 parts by mass of ethylene-octene copolymer, 32.8 parts by mass of low-density polyethylene, 1 part by mass of opening agent and 1.2 parts by mass of slip agent are weighed as the resin raw material of the heat-sealing layer;

[0032] The three material tanks of the film blowing machine are respectively added with the raw material of the corona layer resin, the raw material of the middle layer resin and the raw material of the heat-sealing layer resin; the raw materials in the three material tanks are blown into films and then cooled and shaped, and the surface of the shaped film corona layer is subjected to corona treatment to obtain a polyethylene film.

[0033] S3, a 15um NY printing film and a 60um polyethylene film are dry compounded to obtain a cover film.

[0034] Specifically, the first linear low-density polyethylene has a trade name of 7047 produced by Zhejiang Petrochemical Company; the metallocene low-density polyethylene has a trade name of 3505MC produced by Exxon Company; the ethylene-octene copolymer has a trade name of PF0101KE produced by INEOS Company; the low-density polyethylene has a trade name of 150BW produced by Yangba Petrochemical Company; the opening agent has a trade name of AB-20LD produced by Aaron Company; and the slip agent has a trade name of 10090-K produced by Anpiaosi Company. The density of the first linear low-density polyethylene is 0.912 g / cm 3 , and the melt flow rate is 1 g / 10 min; the density of the metallocene low-density polyethylene is 0.925 g / cm 3 , and the melt flow rate is 0.5 g / 10 min. The melting point of the ethylene-octene copolymer is 80-110℃.

[0035] In the 60um polyethylene film, the thickness ratios of the corona layer, the middle layer and the heat-sealing layer are 24.4%, 51.4% and 24.2% respectively.

[0036] Comparative Example 1

[0037] The cover film material has a material quality of NY / PE / extruded EVA resin, that is, the NY film and the PE film are dry compounded and then subjected to an extrusion process with the EVA resin to obtain the cover film, and the thicknesses of the NY film, the PE film and the EVA resin are 15um, 25um and 35um respectively.

[0038] The cover films prepared in Example 1 and Comparative Example 1 are respectively compounded with a PP large cup body with a content of 1kg, and the detection results are shown in Table 1 as follows:

[0039] Table 1

[0040]

[0041] From the above table 1, the sealing strength of the cover film prepared by the application is much greater than that of the cover film prepared by the comparative example 1, and the cover film prepared by the application does not break after being compounded with the PP large cup, while the cover film of the comparative example 1 is prone to break after being compounded with the PP large cup. The application adopts a low-fat-soluble blown film PE formula and a low-melt-point POP for polyethylene film, which can be sealed with the PP cup, and the special low-melt-point polyethylene film has a small overall thickness change, high and uniform heat sealing strength when sealed under high temperature and high pressure.

[0042] The cover film prepared by the application can meet the requirements of consumers when the content is a large weight product, and can withstand the impact and drop requirements during transportation, thereby avoiding the occurrence of the broken cup phenomenon.

[0043] The above is only the preferred embodiment of the application, and it should be pointed out that for ordinary skilled persons in the art, several improvements and refinements can be made without departing from the principles of the application, and these improvements and refinements should also be considered as the protection scope of the application.

Claims

1. A large cup lid film that can satisfy a passage requirement, characterized by, The application relates to a cover film body sealed with a polypropylene cup body, which is formed by dry compounding of a NY printing film and a polyethylene film; the polyethylene film comprises a corona layer, an intermediate layer and a heat-sealing layer connected in sequence, and the heat-sealing layer is connected with the polypropylene cup body; the corona layer is composed of first linear low-density polyethylene, the intermediate layer is composed of first linear low-density polyethylene and metallocene low-density polyethylene, and the heat-sealing layer is composed of ethylene-octene copolymer, low-density polyethylene, an opening agent and a slip agent.

2. The large cup lid film satisfying the passage requirement according to claim 1, wherein, The intermediate layer is composed of 75 mass parts of first linear low-density polyethylene and 25 mass parts of metallocene low-density polyethylene, and the heat-sealing layer is composed of 65 mass parts of ethylene-octene copolymer, 32.8 mass parts of low-density polyethylene, 1 mass part of an opening agent and 1.2 mass parts of a slip agent.

3. The large cup lid film satisfying the passage requirement according to claim 1 or 2, characterized in that, The first linear low-density polyethylene is of the brand 7047 produced by Zhejiang Petrochemical Company, the metallocene low-density polyethylene is of the brand 3505MC produced by Exxon Company, the ethylene-octene copolymer is of the brand PF0101KE produced by INEOS Company, the low-density polyethylene is of the brand 150BW produced by Yangba Petrochemical Company, the opening agent is of the brand AB-20LD produced by Aaron Company, and the slip agent is of the brand 10090-K produced by Anpei Company.

4. The large cup lid film satisfying the passage requirement according to claim 1 or 2, wherein, said first linear low density polyethylene having a density of 0.912 g / cm 3 , a melt flow rate of 1 g / 10 min; the metallocene low density polyethylene having a density of 0.925 g / cm 3 , a melt flow rate of 0.5 g / 10 min.

5. The large cup lid film satisfying the passage requirement according to claim 1 or 2, wherein, The melting point of the ethylene-octene copolymer is 80-110 DEG C.

6. The large cup lid film of claim 1, wherein, The thickness ratio of the NY printing film to the polyethylene film is 1:

4.

7. The large cup lid film satisfying the passage requirement according to claim 1 or 6, wherein, The thickness of the NY printing film is 15 um, and the thickness of the ethylene film is 60 um.

8. The large cup lid film of claim 1, wherein, The thickness ratio of the corona layer, the intermediate layer and the heat-sealing layer is 24.4%, 51.4% and 24.2% respectively.

9. The large cup lid film of claim 1, wherein, The NY printing film is prepared by a printing process.

10. A process for producing a large cup lid film satisfying a via requirement according to any one of claims 1 to 9, characterized by, The production process comprises the following steps: S1, printing process: preparing a NY printing film by a printing process; S2, according to a resin raw material formula, adding corona layer resin raw materials, intermediate layer resin raw materials and heat-sealing layer resin raw materials into three barrels of a film blowing machine respectively; cooling and shaping the raw materials in the three barrels after film blowing, and then performing corona treatment on the surface of the shaped film to obtain a polyethylene film; S3, preparing a cover film by dry compounding of the NY printing film and the polyethylene film.

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