High-toughness wrapping film

Abstract

The utility model discloses a high-toughness wrapping film which comprises a first metallocene polyethylene layer, a linear low-density polyethylene layer capable of enhancing the viscosity and toughness of the film is stacked on the first metallocene polyethylene layer, and a second metallocene polyethylene layer used for enhancing the elastic tension of the middle section of the film is stacked on the linear low-density polyethylene layer. A third metallocene polyethylene layer for enhancing the elastic tension of the initial section of the film is stacked on the second metallocene polyethylene layer, and a mixed layer formed by mixing polyethylene and an elastomer is stacked on the third metallocene polyethylene layer. The mixing layer, the third metallocene polyethylene layer, the second metallocene polyethylene layer, the linear low-density polyethylene layer and the first metallocene polyethylene layer are sequentially stacked and matched, so that the wrapping film has the outstanding performance of stress cracking resistance, good tensile strength, impact resistance, tear resistance and the like, the whole wrapping film is high in toughness, and the wrapping film is suitable for large-scale production. And the packaging capacity of the wrapping film is improved.

Description

Technical Field

[0001] The utility model relates to a high-toughness winding film.

Background Art

[0002] Existing winding films are mostly prepared by casting or blown film process using low-density polyethylene. However, due to the relatively single composition of the winding film, the tensile strength and tear resistance of the winding film material are low. When winding and packaging, if the pulling force is slightly larger, fracture will occur, and it cannot be well applied to packaging products. In addition, at present, winding films are mostly single-layer or double-layer, and such films have poor uniformity, poor tensile strength, and poor puncture resistance.

[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 high-toughness winding film with a simple structure and good tensile strength.

[0005] The utility model is realized by the following technical solutions:

[0006] A high-toughness winding film, characterized in that: it includes a first metallocene polyethylene layer 1, on which a linear low-density polyethylene layer 2 for enhancing the viscosity and toughness of the film is stacked, on which a second metallocene polyethylene layer 3 for enhancing the elastic tensile force in the middle section of the film is stacked, on which a third metallocene polyethylene layer 4 for enhancing the elastic tensile force at the starting section of the film is stacked, and on which a mixed layer 5 composed of a mixture of polyethylene and an elastomer is stacked.

[0007] The high-toughness winding film as described above, characterized in that: the elastomer is a copolymer of polyethylene and polypropylene.

[0008] The high-toughness winding film as described above, characterized in that: the first metallocene polyethylene layer 1 is made of MLLDPE5220.

[0009] The high-toughness winding film as described above, characterized in that: the second metallocene polyethylene layer 3 is made of MVLDPE3518.

[0010] The high-toughness winding film as described above, characterized in that: the third metallocene polyethylene layer 4 is made of MVLDPE2010.

[0011] The high-toughness winding film as described above, characterized in that: the linear low-density polyethylene layer 2 is made of octane linear low-density polyethylene.

[0012] The high-toughness winding film as described above is characterized in that the thickness ratio of the mixed layer 5, the third metallocene polyethylene layer 4, the second metallocene polyethylene layer 3, the linear low-density polyethylene layer 2, and the first metallocene polyethylene layer 1 is 1:2:3:2:1, and the thickness of the mixed layer 5 is 10 microns.

[0013] The high-toughness winding film as described above is characterized in that the mixed layer 5, the third metallocene polyethylene layer 4, the second metallocene polyethylene layer 3, the linear low-density polyethylene layer 2, and the first metallocene polyethylene layer 1 are hot-pressed and bonded together.

[0014] Compared with the prior art, the present utility model has the following advantages:

[0015] 1. By sequentially stacking and cooperating the mixed layer, the third metallocene polyethylene layer, the second metallocene polyethylene layer, the linear low-density polyethylene layer, and the first metallocene polyethylene layer, the winding film of the present utility model has outstanding properties such as stress crack resistance, good tensile strength, impact resistance, and tear resistance, presenting high toughness as a whole and improving the packaging ability of the winding film.

Description of the Drawings

[0016] Figure 1 is a schematic structural diagram of the present utility model.

Specific Embodiments

[0017] The present utility model will be further described below with reference to the drawings:

[0018] As Figure 1 shown, a high-toughness winding film includes a first metallocene polyethylene layer 1. A linear low-density polyethylene layer 2 that can enhance the stickiness and toughness of the film is stacked on the first metallocene polyethylene layer 1. A second metallocene polyethylene layer 3 for enhancing the elastic tensile force in the middle section of the film is stacked on the linear low-density polyethylene layer 2. A third metallocene polyethylene layer 4 for enhancing the elastic tensile force at the starting section of the film is stacked on the second metallocene polyethylene layer 3. A mixed layer 5 formed by mixing polyethylene and an elastomer is stacked on the third metallocene polyethylene layer 4. By sequentially stacking and cooperating the mixed layer 5, the third metallocene polyethylene layer 4, the second metallocene polyethylene layer 3, the linear low-density polyethylene layer 2, and the first metallocene polyethylene layer 1, the winding film has outstanding properties such as stress crack resistance, good tensile strength, impact resistance, and tear resistance, presenting high toughness as a whole and improving the packaging ability of the winding film.

[0019] Specifically, the elastomer is a copolymer of polyethylene and polypropylene. The addition of this elastomer can make the winding film have excellent resilience performance, improve toughness, and enhance impact resistance and puncture resistance.

[0020] Specifically, the first metallocene polyethylene layer 1 is made of MLLDPE 5220G, and Dow Chemical ELITE 5220G can be selected in specific implementation. The design of the first metallocene polyethylene layer 1 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, there will be no fracture phenomenon. Moreover, when being collided by an external object, the rupture of the winding film at the collision point can also be reduced, minimizing the impact on the wrapped object.

[0021] Specifically, the second metallocene polyethylene layer 3 is made of MVLDPE 3518, and ExxonMobil Exceed 3518PA can be selected in specific implementation. The design of the second metallocene polyethylene layer 3 can also 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.

[0022] Specifically, the third metallocene polyethylene layer 4 is made of MVLDPE 2010, and ExxonMobil Enable 2010 can be selected in specific implementation. The design of the third metallocene polyethylene layer 4 can enhance the elastic tensile force at the starting section of this winding film, enabling the film to withstand a large tensile force at the starting section. The cooperation of the first metallocene polyethylene layer 1, the second metallocene polyethylene layer 3 and the third metallocene polyethylene layer 4 can enable the whole winding film to withstand a large tensile force, facilitating the winding and packaging of objects.

[0023] Specifically, the linear low density polyethylene layer 2 is made of octane linear low density polyethylene. The octane linear low density polyethylene layer can enhance the adhesiveness of this winding film, has good tensile properties, can resist impact and prevent cracking.

[0024] In this utility model, the thickness ratio of the mixed layer 5, the third metallocene polyethylene layer 4, the second metallocene polyethylene layer 3, the linear low density polyethylene layer 2 and the first metallocene polyethylene layer 1 is 1:2:3:2:1. The thickness of the mixed layer 5 is 10 microns, then the thickness of the third metallocene polyethylene layer 4 is 20 microns, the thickness of the second metallocene polyethylene layer 3 is 30 microns, the thickness of the linear low density polyethylene layer 2 is 20 microns, and the thickness of the first metallocene polyethylene layer 1 is 10 microns. At the above thickness ratio, this winding film has high toughness as a whole and relatively low production cost.

[0025] In this utility model, the mixed layer 5, the third metallocene polyethylene layer 4, the second metallocene polyethylene layer 3, the linear low density polyethylene layer 2 and the first metallocene polyethylene layer 1 are hot-pressed and bonded together.

Claims

1. A high-toughness winding film, characterized in that: It includes a first metallocene polyethylene layer (1), on which a linear low-density polyethylene layer (2) capable of enhancing the film adhesiveness and toughness is superposed. On the linear low-density polyethylene layer (2), a second metallocene polyethylene layer (3) for enhancing the elastic tensile force in the middle section of the film is superposed. On the second metallocene polyethylene layer (3), a third metallocene polyethylene layer (4) for enhancing the elastic tensile force at the starting section of the film is superposed. On the third metallocene polyethylene layer (4), a mixed layer (5) made of a mixture of polyethylene and an elastomer is superposed. The thickness ratio of the mixed layer (5), the third metallocene polyethylene layer (4), the second metallocene polyethylene layer (3), the linear low-density polyethylene layer (2) and the first metallocene polyethylene layer (1) is 1:2:2:3:1, and the thickness of the mixed layer (5) is 10 microns. The mixed layer (5), the third metallocene polyethylene layer (4), the second metallocene polyethylene layer (3), the linear low-density polyethylene layer (2) and the first metallocene polyethylene layer (1) are hot-pressed and bonded together.

2. The high-toughness winding film according to claim 1, wherein: The first metallocene polyethylene layer (1) is made of MLLDPE 5220G.

3. The high-toughness winding film according to claim 1, wherein: The second metallocene polyethylene layer (3) is made of MVLDPE 3518.

4. The high-toughness winding film according to claim 1, wherein: The third metallocene polyethylene layer (4) is made of MVLDPE 2010.

5. The high-toughness winding film according to claim 1, wherein: The linear low-density polyethylene layer (2) is made of octane linear low-density polyethylene.

Images