CN219338875U

CN219338875U - Composite film structure for industrial packaging

Info

Publication number: CN219338875U
Application number: CN202223507329.6U
Authority: CN
Inventors: 杨少辉; 毕宏海; 储江顺
Original assignee: Shanghai Bangzhong New Material Co ltd
Current assignee: Shanghai Bangzhong New Material Co ltd
Priority date: 2022-12-28
Filing date: 2022-12-28
Publication date: 2023-07-14
Anticipated expiration: 2032-12-28

Abstract

The application relates to a composite film structure for industrial packaging, which comprises a first polyethylene layer, a first bonding resin layer, a barrier layer, a second bonding resin layer and a second polyethylene layer which are sequentially arranged, wherein the average thickness of the first polyethylene layer, the first bonding resin layer, the barrier layer, the second bonding resin layer and the second polyethylene layer is D1, D2, D3, D4 and D5 in sequence, and the average thickness of the composite film structure is D; wherein the ratio of D3 to D is 0.1 to 0.3. The composite film has good mechanical properties and good blocking effect, and is very suitable for industrial packaging.

Description

Composite film structure for industrial packaging

Technical Field

The present application relates to the field of industrial packaging, and in particular to a composite film structure for industrial packaging.

Background

The composite film for industrial packaging has the characteristics of water resistance, high barrier, corrosion resistance and the like, can well meet the requirements of various packaging occasions, has the incomparable advantages of a dry composite film, can replace the dry composite film or reduce the number of times of dry composite, and has the characteristics of environmental protection and energy conservation. Therefore, the utility model designs a composite film structure for industrial packaging, which can save a great deal of cost for packaging enterprises, is flexible and changeable, and can meet the requirements of various clients.

Disclosure of Invention

In order to obtain a composite film for industrial packaging with good barrier effect, the application provides a composite film structure for industrial packaging.

The application provides a composite film structure for industrial packaging adopts following technical scheme:

the composite film structure for industrial packaging comprises a first polyethylene layer, a first bonding resin layer, a barrier layer, a second bonding resin layer and a second polyethylene layer which are sequentially arranged, wherein the average thickness of the first polyethylene layer, the first bonding resin layer, the barrier layer, the second bonding resin layer and the second polyethylene layer is D1, D2, D3, D4 and D5 in sequence, and the average thickness of the composite film structure is D; wherein the ratio of D3 to D is 0.1 to 0.3

Through adopting above-mentioned technical scheme, the composite film structure in this application includes five-layer structure altogether, is the polyethylene layer that is located outside direct and outside contact in both sides respectively, and polyethylene has good performance, can form good protection to the inside membrane structure of composite film, is two-layer bonding resin layer that is located two-layer polyethylene layer inboard, is the barrier layer in the middle of the two-layer bonding resin layer, and the both sides of barrier layer are all connected with one deck polyethylene layer through bonding resin layer to form the composite film structure that intensity is high, atress is difficult for taking place the layer separation. In addition, in order to ensure that the composite film structure has a good barrier effect, it is required that the ratio of the thickness D3 of the barrier layer to the thickness D of the composite film structure is not less than 0.1; however, the ratio of the thickness D3 of the barrier layer to the thickness D of the composite film structure is not preferably greater than 0.3, so as to avoid that the mechanical properties of the composite film structure cannot meet the use requirements.

Optionally, the ratio of D3 to D is 0.15 to 0.25.

Optionally, the difference in thickness between d1 and d5 is no greater than 10%; the thickness difference is calculated by the following formula:

thickness difference =

。

By adopting the technical scheme, the first polyethylene layer and the second polyethylene layer are respectively positioned at two sides of the composite film structure, so that the mechanical properties of the composite film are also determined to a great extent, and if the thickness difference of the first polyethylene layer and the second polyethylene layer is overlarge, the overlarge difference (such as puncture resistance) of the mechanical properties of the two sides of the composite film is likely to be generated, so that the thickness difference of the first polyethylene layer and the second polyethylene layer is required to be controlled to be not more than 10%.

Optionally, the ratio of D1 to D is 0.2-0.3; and/or the ratio of D5 to D is 0.2-0.3.

By adopting the technical scheme, on the basis of ensuring that the composite film has good barrier performance, the composite film also needs to have good mechanical performance, and the proper thickness of the polyethylene layers positioned on the two sides of the composite film can ensure that the composite film has good mechanical performance.

Optionally, the maximum thickness D of the composite membrane structure _max Minimum thickness D with the composite membrane structure _min The difference, with said D, is not more than 10%.

By adopting the technical scheme, the thickness uniformity of the composite film needs to be controlled in a reasonable range, and if the thickness uniformity of the composite film is poor, the area with smaller thickness of the composite film can become a weak part of mechanical property during use, and the rupture is easy to occur.

Optionally, the transmittance of the composite film structure is not greater than 90%, and the gurley value of the composite film structure is not less than 10000s.

By adopting the above technical scheme, it is generally considered that the barrier properties required for the composite film for industrial packaging include light resistance, gas permeation resistance and the like. When the transmittance of the composite film is not more than 90% and the gurley value is not less than 10000s, the composite film has good light and gas permeation resistance, thereby forming good protection effect.

Optionally, the 180 ° peel strength of the first polyethylene layer to the barrier layer is not less than 5N/cm; and/or the 180 ° peel strength of the second polyethylene layer and the barrier layer is not less than 5N/cm.

By adopting the technical scheme, the peeling strength of the first polyethylene layer and the second polyethylene layer is high, the first polyethylene layer and the second polyethylene layer are not easy to peel, and the composite film is not easy to generate layering phenomenon when in use.

Optionally, the maximum tensile strength of the composite film structure is not less than 10Mpa, and the breaking tensile rate of the composite film structure is not less than 200%.

By adopting the technical scheme, the composite film is used as an industrial packaging film and has to have good mechanical properties.

In summary, the present application includes at least one of the following beneficial technical effects:

1. by forming a five-layer composite film structure and controlling the thickness ratio of the barrier layer in the composite film structure, the composite film structure can be ensured to have good mechanical properties and good barrier capability;

2. by limiting the parameters such as the thickness ratio, thickness uniformity and the like of each layer of film structure in the composite film structure, the composite film can be further ensured to have good barrier property and mechanical property.

Drawings

FIG. 1 is a schematic view of the structural layers of a composite membrane structure in an embodiment of the present application.

Reference numerals illustrate: 1. a first polyethylene layer; 2. a first adhesive resin layer; 3. a barrier layer; 4. a second adhesive resin layer; 5. and a second polyethylene layer.

Detailed Description

The present application is described in further detail below in conjunction with fig. 1.

The embodiment of the application discloses composite film structure for industrial packaging, including first polyethylene layer 1, first bonding resin layer 2, barrier layer 3, second bonding resin layer 4 and second polyethylene layer 5 that set gradually. Wherein the raw materials of the first polyethylene layer 1 and the second polyethylene layer 5 are linear low-density polyethylene; nylon is used as the material of the barrier layer 3. The composite film structure is characterized in that the composite film structure is formed by adopting five-layer coextrusion film blowing equipment, setting the heating temperature to be 180-250 ℃, conveying materials of each layer through a screw rod of an extruder, entering the cavity of the extruder, simultaneously extruding from a multi-layer die head of the extruder after hot melting, and finally obtaining the composite film for industrial packaging shown in figure 1 through the process links of extrusion, film blowing, cooling, rolling, cutting and the like.

In the composite film structure, the average thickness of the first polyethylene layer 1, the first adhesive resin layer 2, the barrier layer 3, the second adhesive resin layer 4 and the second polyethylene layer 5 is D1, D2, D3, D4 and D5 in order, the average thickness of the composite film structure is D, and the thickness of the position where the thickness of the composite film structure is maximum is D _max The thickness of the minimum part of the composite membrane structure is D _min 。

Wherein the ratio of D3 to D is 0.1 to 0.3, preferably the ratio of D3 to D is 0.15 to 0.25; the ratio of D1 to D is 0.2 to 0.3, and the ratio of D5 to D is 0.2 to 0.3; d (D) _max And D _min The difference, the ratio to D is not more than 10%; d1 and d5 have a thickness difference of not more than 10%; the thickness difference is calculated by the following formula: thickness difference =

。

The transmittance of the composite film structure is not more than 90%, and the gurley value is not less than 10000s; the 180-degree peel strength of the first polyethylene layer and the barrier layer is not less than 5N/cm; the 180 DEG peel strength of the second polyethylene layer and the barrier layer is not less than 5N/cm; the maximum tensile strength is not less than 10Mpa, and the breaking elongation is not less than 200%.

The present embodiment is only for explanation of the present utility model and is not to be construed as limiting the present utility model, and modifications to the present embodiment, which may not creatively contribute to the present utility model as required by those skilled in the art after reading the present specification, are all protected by patent laws within the scope of claims of the present utility model.

Claims

1. The utility model provides a compound membrane structure for industrial packaging which characterized in that: the composite film comprises a first polyethylene layer (1), a first bonding resin layer (2), a barrier layer (3), a second bonding resin layer (4) and a second polyethylene layer (5) which are sequentially arranged, wherein the average thickness of the first polyethylene layer (1), the first bonding resin layer (2), the barrier layer (3), the second bonding resin layer (4) and the second polyethylene layer (5) is D1, D2, D3, D4 and D5 in sequence, and the average thickness of the composite film structure is D; wherein the ratio of D3 to D is 0.15-0.25;

the difference in thickness between d1 and d5 is no more than 10%; the thickness difference is calculated by the following formula:

the maximum thickness position D of the composite membrane structure _max Minimum thickness D with the composite membrane structure _min The difference, with said D, is not more than 10%.

2. The composite film structure for industrial packaging according to claim 1, wherein: the ratio of D1 to D is 0.2-0.3; and/or the ratio of D5 to D is 0.2 to 0.3.

3. The composite film structure for industrial packaging according to claim 1, wherein: the transmittance of the composite film structure is not more than 90%, and the gurley value of the composite film structure is not less than 10000s.

4. The composite film structure for industrial packaging according to claim 1, wherein: the 180 DEG peel strength of the first polyethylene layer (1) and the barrier layer (3) is not less than 5N/cm; and/or the 180 DEG peel strength of the second polyethylene layer (5) and the barrier layer (3) is not less than 5N/cm.

5. The composite film structure for industrial packaging according to claim 1, wherein: the maximum tensile strength of the composite film structure is not less than 10Mpa, and the breaking tensile rate of the composite film structure is not less than 200%.