CN213291636U

CN213291636U - High-temperature-resistant easy-to-tear polypropylene film

Info

Publication number: CN213291636U
Application number: CN202021809458.9U
Authority: CN
Inventors: 胡钢; 王庆; 张惕; 夏大雁; 郭二凯
Original assignee: Green Packaging Material Jiangyin Co ltd
Current assignee: Green Packaging Material Jiangyin Co ltd
Priority date: 2020-08-26
Filing date: 2020-08-26
Publication date: 2021-05-28
Anticipated expiration: 2030-08-26

Abstract

The utility model discloses a high temperature resistant film of easily taking off of polypropylene, polypropylene are high temperature resistant film of easily taking off for crowded membrane altogether or including crowded membrane altogether, crowded laminated structure of membrane altogether includes biaxial stretching nylon top layer, polyolefin sandwich layer, nylon sandwich layer and polyethylene polypropylene blend heat-seal layer from outer to inner in proper order. The nylon core layer in the high-temperature-resistant easy-uncovering polypropylene film is used as barrier property, compared with polyolefin, the biaxially oriented nylon surface layer of the co-extruded film has better tensile strength, impact strength and piercing strength, and the polyolefin layer and the nylon layer on the inner side are protected; the polyolefin layer is used as a water-resistant layer outside the nylon core layer, so that the high-temperature-resistant easy-to-tear film of the polypropylene has good tensile strength and dimensional stability.

Description

High-temperature-resistant easy-to-tear polypropylene film

Technical Field

The utility model relates to a packaging film technical field, concretely relates to polypropylene is high temperature resistant easily takes off film.

Background

The polypropylene material has excellent high temperature resistance and wide application, and is particularly suitable for meat packaging in the field of food packaging. The production process of the polypropylene tray box for meat packaging comprises the following steps: and coating PE on the surface of the support box, and combining the PE with the PE easy-to-uncover film to form an easy-to-uncover structure. The high-temperature-resistant cooking easy-to-tear-off die in the prior art is as described in CN207156619U, and comprises an outer layer, a high-temperature-resistant cooking glue layer, a polypropylene film layer and an inner layer cooking-resistant easy-to-tear-off layer which are sequentially laminated from top to bottom, wherein the inner layer cooking-resistant easy-to-tear-off layer is a modified polypropylene film. The composite easy-to-uncover film has simple layered structure, poor barrier property and complex film layer covering production process.

The further improved technical scheme is as described in CN108068423A, and the corona layer comprises a corona layer, an adhesive layer, a barrier layer, an adhesive layer and a heat-sealing layer, wherein the barrier layer is composed of an ethylene-ethylene layer copolymer layer and nylon layers on two sides, and the corona layer is a polypropylene layer. The polypropylene impact resistance of the film surface layer in the structure is not high and is easy to age, the impact resistance of the film mainly depends on two nylon layers in the barrier layer, the polypropylene surface layer scratch can cause the moisture absorption amount of the middle nylon layer and the ethylene-ethylene layer copolymer layer to increase, and particularly in the environment with high steam amount, the barrier property is greatly reduced.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to overcome the defect that exists among the prior art, provide a polypropylene high temperature resistant film of easily taking off, the nylon sandwich layer is as the barrier layer, and biaxial stretching nylon top layer, the polyolefin sandwich layer barrier property in the nylon sandwich layer outside are good.

Realize above-mentioned technological effect, the utility model discloses a technical scheme does: the high-temperature-resistant easy-to-tear polypropylene film is a co-extruded film or comprises a co-extruded film, and the laminated structure of the co-extruded film sequentially comprises a biaxially oriented nylon surface layer, a polyolefin core layer, a nylon core layer and a polyethylene polypropylene blending heat-sealing layer from outside to inside.

The preferred technical scheme is that bonding layers are arranged between the biaxial stretching nylon surface layer and the polyolefin core layer, between the polyolefin core layer and the nylon core layer and between the nylon core layer and the polyethylene polypropylene blending heat sealing layer.

The preferable technical scheme is that the polyolefin core layer is a polypropylene core layer.

The preferred technical scheme is that the thickness of the surface layer of the biaxially oriented nylon is 5-10 mu m.

The preferred technical scheme does, biaxial stretching nylon top layer surface is provided with the corona surface, the corona surface is provided with the printing ink layer.

The preferable technical scheme is that the ink further comprises a composite surface layer, and the ink layer is clamped between the composite surface layer and the biaxial stretching nylon surface layer.

The preferable technical scheme is that the composite surface layer is a bidirectional stretching nylon composite layer.

The utility model has the advantages and the beneficial effects that:

the nylon core layer in the high-temperature-resistant easy-uncovering polypropylene film is used as barrier property, compared with polyolefin, the biaxially oriented nylon surface layer of the co-extruded film has better tensile strength, impact strength and piercing strength, and the polyolefin layer and the nylon layer on the inner side are protected;

the polyolefin layer is used as a water-resistant layer outside the nylon core layer, so that the high-temperature-resistant easy-to-tear film of the polypropylene has good tensile strength and dimensional stability;

the polypropylene high-temperature-resistant easy-uncovering film has the advantages of simple production process, low cost, high transparency and safe use.

Drawings

FIG. 1 is a schematic structural view of a high temperature resistant easy release film of polypropylene according to example 1;

FIG. 2 is a schematic structural view of a high temperature resistant easy release film of polypropylene according to example 2;

FIG. 3 is a schematic structural view of a high temperature resistant easy-release polypropylene film of example 3;

FIG. 4 is a schematic structural view of a high temperature resistant easy release film of polypropylene according to example 4;

in the figure: 1. a biaxially oriented nylon surface layer; 2. an adhesive layer; 3. a polypropylene layer; 4. a nylon core layer; 5. a polyethylene polypropylene blending heat sealing layer; 6. a first polyethylene layer; 7. a second polyethylene layer; 8. a pattern layer; 9. biaxially stretching the nylon composite layer; 10. and (4) compounding an adhesive layer.

Detailed Description

The following description will further describe embodiments of the present invention with reference to the accompanying drawings and examples. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.

The adhesive layer in the co-extruded film is used for bonding the film layers which cannot be directly co-extruded and laminated so as to ensure the interlayer peeling force, and the selection of the material and the thickness of the adhesive layer is comprehensively determined according to the film materials on the two sides of the adhesive layer and the required adhesive strength.

The polypropylene high-temperature-resistant easy-uncovering film can be a co-extruded film and can also comprise a co-extruded film. The co-extruded film is usually made of transparent material, and the latter solution including co-extruded film also obtains the easy-to-tear film with hydrophilic surface layer by corona, or prints patterns on the surface of the easy-to-tear film by utilizing the printability of nylon to obtain the easy-to-tear film with identification patterns.

Example 1

As shown in fig. 1, the polypropylene high temperature resistant easy-uncovering film of example 1 is a seven-layer co-extruded film, the co-extruded laminated structure sequentially comprises a biaxially oriented nylon surface layer 1, an adhesive layer 2, a polypropylene layer 3, an adhesive layer 2, a nylon core layer 4, an adhesive layer 2 and a polyethylene-polypropylene blending heat-sealing layer 5 from outside to inside, and the film structure is HOPA/TIE/PP/TIE/PA/TIE/(PP + PE). The arrows in fig. 1 indicate the outer-to-inner direction.

Example 1 the seven-layer co-extruded film had the following film layer thicknesses:

as shown in figure 1, the surface layer of the biaxially oriented nylon is 7 μm, the adhesive layer is 5.2 μm, the polypropylene layer is 25 μm, the adhesive layer is 5.2 μm, the nylon core layer is 7 μm, the adhesive layer is 5.6 μm and the polyethylene-polypropylene blending heat sealing layer is 15 μm. The polyethylene polypropylene blending heat sealing layer is formed by blending polypropylene, linear low-density polyethylene and polyethylene.

The detection result of the physical and mechanical properties of the co-extruded film is as follows:

1. longitudinal breaking force 25N and transverse breaking force 23N (detection standard GB/T1040.3-2006);

2. nominal strain at break: longitudinal 522% and transverse 523% (detection standard GB/T1040.3-2006);

3. right angle tear force: longitudinal 118N/mm, transverse 137N/mm (test standard QB/T1130-1991);

4. the heat seal strength is 5N;

5. water vapor transmission amount: 3g/(m2 & 24h) (detection standard GB/T1037-1988);

6. oxygen transmission amount: 49cm3/(m 2.24 h.0.1 MPa) (detection standard GB/T1038-2000).

Example 2

As shown in fig. 2, example 2 is based on example 1, and is different in that a co-extrusion lamination structure of a seven-layer co-extrusion film comprises, from outside to inside, a biaxially oriented nylon surface layer 1, an adhesive layer 2, a first polyethylene layer 6, a second polyethylene layer 7, a nylon core layer 4, an adhesive layer 2 and a polyethylene-polypropylene blending heat-sealing layer 5, and the film structure is HOPA/TIE/PE/PA/TIE/(PP + PE). The arrows in fig. 2 indicate the outer-to-inner direction.

Compared with the example 1, the core layer of the example 2 is made of PE, and the high-temperature resistant glue of the example 1 is poor.

Example 3

As shown in fig. 3, the embodiment 3 comprises a pattern layer and the seven-layer co-extruded film of the embodiment 1, the biaxially oriented nylon surface layer 1 of the co-extruded film is subjected to corona treatment to obtain a corona surface, and the pattern layer 8 is coated on the corona surface. The arrows in fig. 3 indicate the outer-to-inner direction.

Example 3 is suitable for food packaging for low or ambient temperature storage, and is not suitable for packaging steamed food because the pattern layer 8 is directly exposed to the surface of the film.

Example 4

As shown in fig. 4, example 4 is based on example 3, except that example 4 further includes a biaxially oriented nylon composite layer 9, the biaxially oriented nylon composite layer 9 being compounded with a seven-layer coextruded film having a pattern layer 8 and a corona surface. Specifically, the biaxially oriented nylon composite layer 9 is bonded and compounded with the biaxially oriented nylon surface layer 1 of the seven-layer co-extruded film through the composite adhesive layer 10. The arrows in fig. 4 indicate the outer-to-inner direction.

In embodiment 4, the biaxially oriented nylon composite layer is arranged outside the pattern layer in a composite manner, so that the packaging structure is suitable for food packaging needing cooking, and the packaging structure is a sealed packaging structure with an upper film and a lower tray.

The pattern layer 8 of example 3, the biaxially oriented nylon composite layer 9 of example 4, the composite adhesive layer 10, and the pattern layer 8 may be provided on the surface of example 2. Similarly, the biaxially stretched nylon surface layer 1 of example 2 is also subjected to corona treatment in order to enhance the adhesion of the pattern layer ink to the biaxially stretched nylon surface layer 1.

The same or similar film structure as that in the embodiment 1 and the embodiment 2 may also be HOPA/TIE/PE/TIE/PA/TIE/(PP + PE), or may be configured as eight-layer co-extrusion, nine-layer co-extrusion, or ten-layer co-extrusion structure, and adopts PA/EVOH/PA, PA/EVOH containing nylon core layer as barrier layer, or increases the number of co-extrusion layers of polyolefin, such as PE/PE/PE co-extrusion structure.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of improvements and decorations can be made without departing from the technical principle of the present invention, and these improvements and decorations should also be regarded as the protection scope of the present invention.

Claims

1. The high-temperature-resistant easy-to-tear polypropylene film is characterized in that the high-temperature-resistant easy-to-tear polypropylene film is a co-extruded film or comprises a co-extruded film, and a laminated structure of the co-extruded film sequentially comprises a biaxially oriented nylon surface layer, a polyolefin core layer, a nylon core layer and a polyethylene polypropylene blending heat-sealing layer from outside to inside.

2. The polypropylene high-temperature-resistant easy-uncovering film according to claim 1, wherein bonding layers are arranged between the biaxially oriented nylon surface layer and the polyolefin core layer, between the polyolefin core layer and the nylon core layer, and between the nylon core layer and the polyethylene polypropylene blending heat-sealing layer.

3. The polypropylene high temperature resistant easy release film according to claim 1, wherein the polyolefin core layer is a polypropylene core layer.

4. The polypropylene high-temperature-resistant easy-uncovering film according to claim 1, wherein the thickness of the biaxially oriented nylon surface layer is 5-10 μm.

5. The polypropylene high-temperature-resistant easy-uncovering film as claimed in claim 1, wherein the thickness of the nylon core layer is 5-10 μm.

6. The polypropylene high-temperature-resistant easy-open film as claimed in claim 1, wherein a corona surface is arranged on the surface of the biaxially oriented nylon surface layer, and an ink layer is arranged on the corona surface.

7. The polypropylene high temperature resistant easy-open film according to claim 6, further comprising a composite surface layer, wherein the ink layer is sandwiched between the composite surface layer and the biaxially oriented nylon surface layer.

8. The polypropylene high temperature resistant easy-open film according to claim 7, wherein the composite surface layer is a biaxially oriented nylon composite layer.