Winding film for tobacco industry

Abstract

The utility model discloses a wrapping film for tobacco industry, which comprises a wrapping film surface layer, one side of the wrapping film surface layer is provided with a tensile impact-resistant layer, one side of the tensile impact-resistant layer far away from the wrapping film surface layer is provided with a transparent tensile layer, and one side of the transparent tensile layer far away from the tensile impact-resistant layer is provided with a transparent toughening layer. And the wrapping film surface layer, the tensile impact-resistant layer, the transparent tensile layer and the transparent toughening layer are bonded by hot pressing. According to the utility model, the wrapping film surface layer, the tensile impact-resistant layer, the transparent tensile layer, the transparent toughening layer and the waterproof layer are sequentially stacked and matched, the advantages of each layer of film are fully utilized, and the coordination is enhanced, so that the wrapping film for the tobacco industry has the performances of good tensile strength, impact resistance, transparency and toughness, excellent waterproof performance and the like; compared with an existing PE heat-shrinkable film, the heat-shrinkable film is convenient to recycle and beneficial to environmental protection.

Description

Technical Field

[0001] The utility model relates to a winding film for the tobacco industry.

Background Art

[0002] In the tobacco industry, PE heat-shrinkable film is used to package whole strips and whole boxes of cigarettes in large quantities. The main function of the PE heat-shrinkable film is to integrate these cigarettes, facilitate handling, and at the same time protect the outer packaging of the cigarettes to prevent them from being scratched and affecting sales. However, due to the lack of toughness and impact resistance of the simple PE heat-shrinkable film, it is relatively brittle and easy to break during winding packaging, which is not conducive to recycling. Moreover, its transparency is also poor, which is not conducive to identifying products and checking the integrity of packaging.

[0003] Therefore, the present utility model is precisely produced based on the above deficiencies.

Content of the Utility Model

[0004] The purpose of the utility model is to overcome the deficiencies of the prior art and provide a winding film for the tobacco industry with a simple structure, good tensile strength, good toughness, and good transparency, which is convenient for recycling and is environmentally friendly.

[0005] The present utility model is achieved through the following technical solutions:

[0006] A winding film for the tobacco industry, characterized in that: it includes a winding film surface layer 1, one side of the winding film surface layer 1 is provided with a stretching and impact-resistant layer 2, the side of the stretching and impact-resistant layer 2 away from the winding film surface layer 1 is provided with a transparent stretching layer 3, the side of the transparent stretching layer 3 away from the stretching and impact-resistant layer 2 is provided with a transparent toughening layer 4, and the winding film surface layer 1, the stretching and impact-resistant layer 2, the transparent stretching layer 3, and the transparent toughening layer 4 are hot-pressed and bonded together.

[0007] The winding film for the tobacco industry as described above, characterized in that: a waterproof layer 5 is provided on the side of the transparent toughening layer 4 away from the transparent stretching layer 3.

[0008] The winding film for the tobacco industry as described above, characterized in that: the winding film surface layer 1 is made of low-pressure linear polyethylene.

[0009] The winding film for the tobacco industry as described above, characterized in that: the stretching and impact-resistant layer 2 is a mixed layer containing metallocene polyethylene and an elastomer.

[0010] The winding film for the tobacco industry as described above, characterized in that: the transparent stretching layer 3 is a mixed layer containing high-pressure polyethylene and metallocene polyethylene.

[0011] The winding film for the tobacco industry as described above, characterized in that: the transparent toughening layer 4 is a mixed layer containing high-pressure polyethylene, metallocene polyethylene, and polyolefin elastomer.

[0012] The winding film for the tobacco industry as described above is characterized in that the thickness ratio of the surface layer 1, the tensile impact resistance layer 2, the transparent tensile layer 3, the transparent toughening layer 4 and the waterproof layer 5 of the winding film is 1:6:2:1:1, and the thickness of the surface layer 1 of the winding film is 10 microns.

[0013] Compared with the prior art, the utility model has the following advantages:

[0014] 1. Through the sequential stacking and cooperation of the surface layer, the tensile impact resistance layer, the transparent tensile layer, the transparent toughening layer and the waterproof layer of the winding film, the utility model makes full use of the advantages of each layer of film, coordinates and enhances, so that the winding film for the tobacco industry has excellent tensile strength, impact resistance, transparency, toughness and waterproof performance. Compared with the existing PE heat shrinkable film, it is convenient for recycling and is environmentally friendly.

Description of the Drawings

[0015] Figure 1 It is a schematic structural diagram of the utility model.

Specific Embodiments

[0016] The following further describes the utility model with reference to the drawings:

[0017] As Figure 1 shown, a winding film for the tobacco industry includes a surface layer 1 of the winding film. One side of the surface layer 1 of the winding film is provided with a tensile impact resistance layer 2. The side of the tensile impact resistance layer 2 away from the surface layer 1 of the winding film is provided with a transparent tensile layer 3. The side of the transparent tensile layer 3 away from the tensile impact resistance layer 2 is provided with a transparent toughening layer 4. The surface layer 1, the tensile impact resistance layer 2, the transparent tensile layer 3 and the transparent toughening layer 4 are hot-pressed and bonded together.

[0018] Specifically, a waterproof layer 5 is further provided on the side of the transparent toughening layer 4 away from the transparent tensile layer 3. The waterproof layer 5 can be made of common waterproof materials on the market, such as polyvinyl fluoride materials.

[0019] Through the sequential stacking and cooperation of the surface layer, the tensile impact resistance layer, the transparent tensile layer, the transparent toughening layer and the waterproof layer of the winding film, the utility model makes full use of the advantages of each layer of film, coordinates and enhances, so that the winding film for the tobacco industry has excellent tensile strength, impact resistance, transparency, toughness and waterproof performance. Compared with the existing PE heat shrinkable film, it is convenient for recycling and is environmentally friendly.

[0020] Specifically, the surface layer 1 of the winding film is made of low-pressure linear polyethylene. The low-pressure linear polyethylene is LLDPE 1002, also known as low-pressure linear polyethylene 1002, which has good physical and chemical properties. The surface layer 1 of the winding film made of LLDPE 1002 has good strength, good toughness, heat resistance, environmental stress cracking resistance, acid and alkali tolerance, etc., and has a relatively low cost, with the ability to reduce the cost of the film.

[0021] Specifically, the tensile impact-resistant layer 2 is a mixed layer containing metallocene polyethylene and an elastomer. The metallocene polyethylene is MLLDPE 5220G, and in specific implementations, Dow Chemical ELITE 5220G can be selected. Adding metallocene 5220G to the tensile impact-resistant layer 2 can enhance the elastic tensile force in the middle section of this winding film, enabling the film to withstand a large tensile force in the middle section. When winding and packaging an object, no matter how large the tensile force is, the film will not break. Moreover, when it is collided by an external object, the occurrence of breakage of the winding film at the collision point can also be reduced, minimizing the impact on the wrapped object. The elastomer is a copolymer of polyethylene and polypropylene, and the addition of this elastomer can endow the winding film with excellent rebound performance, improve toughness, and enhance impact resistance and puncture resistance.

[0022] Specifically, the transparent stretching layer 3 is a mixed layer containing high-pressure polyethylene and metallocene polyethylene. The high-pressure polyethylene is LDPE 2426, which has high transparency and good processing performance. When added to this winding film, it can endow the winding film with good transparency; the metallocene polyethylene is MVLDPE 2010, and in specific implementations, ExxonMobil Enable2010 can be selected. Adding MVLDPE 2010 to the transparent stretching layer 3 can enhance the elastic tensile force in the starting section of this winding film, enabling the film to withstand a large tensile force in the starting section.

[0023] Specifically, the transparent toughening layer 4 is a mixed layer containing high-pressure polyethylene, metallocene polyethylene, and a polyolefin elastomer. The difference between the transparent toughening layer 4 and the transparent stretching layer 3 is that a polyolefin elastomer POE VM6102 is also added. In specific implementations, ExxonMobil Exceed 6102FL can be selected. It has excellent transparency, elasticity, flexibility, and toughness. The transparent toughening layer 4 added with the elastomer 6102 can enhance the toughness of this winding film and further enhance the transparency of this winding film.

[0024] Specifically, the thickness ratio of the surface layer 1 of the winding film, the tensile impact-resistant layer 2, the transparent tensile layer 3, the transparent toughening layer 4 and the waterproof layer 5 is 1:6:2:1:1. The thickness of the surface layer 1 of the winding film is 10 microns, the thickness of the tensile impact-resistant layer 2 is 60 microns, the thickness of the transparent tensile layer 3 is 20 microns, the thickness of the transparent toughening layer 4 is 10 microns, and the thickness of the waterproof layer 5 is 10 microns. At the above thickness ratio, the overall waterproof effect, transparency, tensile property and toughness of this winding film are good, and the production cost is relatively low.

Claims

1. A winding film for the tobacco industry, characterized in that: It includes a winding film surface layer (1), on one side of the winding film surface layer (1) there is a stretching impact-resistant layer (2), on the side of the stretching impact-resistant layer (2) away from the winding film surface layer (1) there is a transparent stretching layer (3), on the side of the transparent stretching layer (3) away from the stretching impact-resistant layer (2) there is a transparent toughening layer (4), and the winding film surface layer (1), the stretching impact-resistant layer (2), the transparent stretching layer (3) and the transparent toughening layer (4) are hot-pressed and bonded together.

2. The winding film for the tobacco industry according to claim 1, characterized in that: On the side of the transparent toughening layer (4) away from the transparent stretching layer (3) there is a waterproof layer (5).

3. The winding film for the tobacco industry according to claim 1, characterized in that: The winding film surface layer (1) is made of low-pressure linear polyethylene.

4. The winding film for the tobacco industry according to claim 2, wherein: The thickness ratio of the winding film surface layer (1), the stretching impact-resistant layer (2), the transparent stretching layer (3), the transparent toughening layer (4) and the waterproof layer (5) is 1:6:2:1:1, and the thickness of the winding film surface layer (1) is 10 microns.

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