Fruit and vegetable co-extrusion packaging film with extinction effect

Abstract

The utility model discloses a fruit and vegetable co-extrusion packaging film with a matting effect. The utility model relates to the field of food flexible packaging. The problems that when a soft package extinction composite aluminum foil structure is adopted, a packaging material is not transparent, contents in a film cannot be better displayed, and when an extinction composite transparent material is adopted, the barrier property is poor are solved. Comprising a composite layer, a matt layer and an ink layer, the upper portion of the composite layer is connected with the matt layer, the top layer of the matt layer is connected with the bottom layer of the ink layer, and the ink layer is a matt surface layer; the composite layer comprises a first bonding resin layer, a polyester layer, a second bonding resin layer, a polyamide layer, a third bonding resin layer, a bubble polyethylene layer, a high-strength polyethylene layer and an ultralow-temperature polyethylene layer; the bottom layer of the matting surface layer and the top layer of the polyester layer are bonded and connected by the first bonding resin layer, and the bottom layer of the polyester layer and the top layer of the polyamide layer are bonded and connected by the second bonding resin layer. After being compounded, the structure has good barrier property and also has the characteristic of transparency. The utility model relates to the field of food flexible packaging.

Description

Technical Field

[0001] The utility model relates to the field of food soft packaging, and particularly relates to a co-extruded packaging film for fruits and vegetables with a matting effect. Background Art

[0002] With the improvement of people's material living standards and the enhancement of people's health awareness, people have higher requirements for the freshness of various fruit and vegetable products. Therefore, high-barrier packaging films are increasingly favored by merchants and consumers. In the field of soft packaging, there is matting BOPP. Among them, matting BOPP is a polypropylene film with high haze and low gloss and a matting effect in the form of diffuse reflection. The full name of the matting BOPP film is biaxially oriented polypropylene matting film, which is a film made by biaxially stretching with matting masterbatch on a single surface layer. Due to the unique matte effect of matting BOPP, when used as the printing surface layer of soft packaging materials, it will make the packaged products look more three-dimensional and upscale. However, matting generally needs to be compounded with other materials before it can be used as a packaging film. For example, matting is compounded with polyethylene or matting is compounded with polypropylene. The material is transparent, but its barrier performance is poor. In addition, such as a matting composite aluminum foil structure, such as matting is compounded with aluminum foil, polyamide, and polyethylene. Although it has good barrier performance, the packaging material is opaque and cannot better display the contents. Summary of the Invention

[0003] In order to solve the problem that when using a matting composite aluminum foil structure for soft packaging, the packaging material is opaque and cannot better display the contents in the film, and when using a matting composite transparent material, although it can meet the transparency requirements, its barrier performance is poor, the utility model further provides a co-extruded packaging film for fruits and vegetables with a matting effect, which has both good barrier performance and transparent characteristics.

[0004] The technical solution of the utility model is as follows:

[0005] A co-extruded packaging film for fruits and vegetables with a matting effect, including a composite layer, a matting layer, and an ink layer. The upper part of the composite layer is connected to the bottom layer of the matting layer, and the top layer of the matting layer is connected to the bottom layer of the ink layer. The ink layer is a matting surface layer;

[0006] The composite layer includes a first adhesive resin layer, a polyester layer, a second adhesive resin layer, a polyamide layer, a third adhesive resin layer, a bubble polyethylene layer, a high-strength polyethylene layer, and an ultra-low temperature polyethylene layer;

[0007] The first adhesive resin layer adhesively connects the bottom layer of the matte layer and the top layer of the polyester layer. The second adhesive resin layer adhesively connects the bottom layer of the polyester layer and the top layer of the polyamide layer. The third adhesive resin layer adhesively connects the bottom layer of the polyamide layer and the top layer of the foamed polyethylene layer. The bottom layer of the foamed polyethylene layer is connected to the top layer of the high-strength polyethylene layer. The bottom layer of the high-strength polyethylene layer is connected to the top layer of the ultra-low temperature polyethylene layer.

[0008] Preferably, the matte layer includes a matte BOPP layer, a first polypropylene layer, and a second polypropylene layer.

[0009] The bottom layer of the matte BOPP layer is connected to the top layer of the first polypropylene. The bottom layer of the first polypropylene is connected to the top layer of the second polypropylene. The bottom layer of the second polypropylene is connected to the composite layer.

[0010] Preferably, the matte BOPP layer, the first polypropylene layer, the second polypropylene layer, the first adhesive resin layer, the polyester layer, the second adhesive resin layer, the polyamide layer, the third adhesive resin layer, the foamed polyethylene layer, the high-strength polyethylene layer, and the ultra-low temperature polyethylene layer are integrally formed by downblowing and water-cooling blown film.

[0011] Preferably, the matte BOPP layer includes polypropylene particles and high-strength ethylene particles.

[0012] Preferably, the first polypropylene layer contains polypropylene particles and high-strength polyethylene particles.

[0013] Preferably, the second polypropylene layer contains polypropylene particles and an antistatic agent.

[0014] Preferably, the first adhesive resin layer is a maleic anhydride-modified polyolefin resin layer.

[0015] Preferably, the second adhesive resin layer is a maleic anhydride-modified polyolefin layer.

[0016] Preferably, the polyamide layer is a super-barrier nylon layer.

[0017] The present utility model has the following effects compared with the prior art:

[0018] The existing matting material has a three-layer structure, namely a matting layer, a first polypropylene layer, and a second polypropylene layer. When printing, an intaglio printing method is used, and the matting layer is printed on the polypropylene layer. By laminating the matting material with other materials, the ink is sandwiched in the middle. In this utility model, a first adhesive resin layer, a polyester layer, a second adhesive resin layer, a polyamide layer, a third adhesive resin layer, a bubble polyethylene layer, a high-strength polyethylene layer, and a ultra-low temperature polyethylene layer are added to the inner layer of the matting BOPP and integrally formed by downblowing and water-cooling blown film. Then, a surface printing method is used for printing, and polyurethane surface printing ink is used. After that, it is wound into a roll to form a packaging film that simultaneously has matting and barrier properties.

[0019] The polyamide layer of this utility model is a super-barrier nylon, which has good barrier properties against oxygen and water and good puncture resistance. 2% foaming particles are added to the bubble polyethylene layer to increase its puncture resistance and cushioning performance. 5% ultra-low temperature particles of metallocene polyethylene are added to the ultra-low temperature polyethylene layer to lower its sealing temperature and prevent the surface of the matting BOPP from shrinking due to heat during high-temperature bag making, resulting in wrinkles.

[0020] This utility model is integrally formed by a coextrusion blown film machine without the need for lamination. It not only solves the problem that when the matting material is laminated with other transparent materials to be used as a packaging film, the material is transparent and its barrier performance is poor, but also solves the problem that although structures such as matting laminated aluminum foil have good barrier performance, the packaging material is opaque and cannot better display the contents.

[0021] During the forming process of this utility model, by cooling with water from below, the film can be quickly and effectively cooled, with good cooling effect, which helps to improve production efficiency and the quality of the film. At the same time, it has the characteristics of high film flatness. Good cooling uniformity helps to reduce film deformation and wrinkles, making the film surface more flat. It has a wide range of applications and can be used to produce various types and specifications of plastic films. Description of the Drawings

[0022] Figure 1 is a schematic structural diagram of this utility model.

[0023] Figure 2 is Figure 1 a schematic structural diagram of the composite layer in

[0024] Figure 3 a schematic structural diagram when the original ink layer is printed on the matting inner layer.

[0025] In the figure: 1. Composite layer, 2. Matting layer, 3. Ink layer, 1-1. First adhesive resin layer, 1-2. Polyester layer, 1-3. Second adhesive resin layer, 1-4. Polyamide layer, 1-5. Third adhesive resin layer, 1-6. Bubble polyethylene layer, 1-7. High-strength polyethylene layer, 1-8. Ultra-low temperature polyethylene layer, 2-1. Matting BOPP layer, 2-2. First polypropylene layer, 2-3. Second polypropylene layer. Detailed implementation mode

[0026] Detailed implementation mode one: Combining Figure 1 and Figure 2 to illustrate this implementation mode. A fruit and vegetable co-extruded packaging film with a matting effect in this implementation mode includes a composite layer 1, a matting layer 2, and an ink layer 3. The upper part of the composite layer 1 is connected to the bottom layer of the matting layer 2, the top layer of the matting layer is connected to the bottom layer of the ink layer, and the ink layer is the matting surface layer;

[0027] The composite layer includes a first adhesive resin layer 1-1, a polyester layer 1-2, a second adhesive resin layer 1-3, a polyamide layer 1-4, a third adhesive resin layer 1-5, a bubble polyethylene layer 1-6, a high-strength polyethylene layer 1-7, and an ultra-low temperature polyethylene layer 1-8;

[0028] The first adhesive resin layer 1-1 adhesively connects the bottom layer of the matting layer 2 and the top layer of the polyester layer 1-2. The second adhesive resin layer 1-3 adhesively connects the bottom layer of the polyester layer 1-2 and the top layer of the polyamide layer 1-4. The third adhesive resin layer 1-5 adhesively connects the bottom layer of the polyamide layer 1-4 and the top layer of the bubble polyethylene layer 1-6. The bottom layer of the bubble polyethylene 1-6 is connected to the top layer of the high-strength polyethylene layer 1-7. The bottom layer of the high-strength polyethylene layer 1-7 is connected to the top layer of the ultra-low temperature polyethylene layer 1-8.

[0029] Detailed implementation mode two: Combining Figure 1 and Figure 2 to illustrate this implementation mode. A fruit and vegetable co-extruded packaging film with a matting effect in this implementation mode, the matting layer 2 includes a matting BOPP layer 2-1, a first polypropylene layer 2-2, and a second polypropylene layer 2-3;

[0030] The bottom layer of the matting BOPP layer 2-1 is connected to the top layer of the first polypropylene layer 2-2. The bottom layer of the first polypropylene layer 2-2 is connected to the top layer of the second polypropylene layer 2-3. The bottom layer of the second polypropylene layer 2-3 is connected to the composite layer 1.

[0031] The matting BOPP layer contains 65% polypropylene particles and 35% high-strength polyethylene particles to increase the strength of the matting layer.

[0032] The full name of the matte BOPP film is biaxially oriented polypropylene matte film, which is a film made by biaxially stretching with a matte masterbatch on a single surface layer. The surface of the matte film looks like paper and has the feeling of a natural product. It is mainly used for the lamination of papers such as books, periodicals, annual report covers, and cardboard. Another use is to laminate with polyethylene films, cast polypropylene films, BOPP films, pearlescent films, metallized films, etc. for various packaging uses. Currently, the general thickness of the matte film used is about 20μm. The characteristics of the matte BOPP film include low gloss on the matte surface, uniform matting, comfortable hand feeling, elegant appearance, and good slip and printing lamination properties.

[0033] Specific Embodiment Three: Combining Figure 1 and Figure 2 to illustrate this embodiment. A fruit and vegetable co-extruded packaging film with a matte effect in this embodiment, the matte BOPP layer 2-1, the first polypropylene layer 2-2, the second polypropylene layer 2-3, the first adhesive resin layer 1-1, the polyester layer 1-2, the second adhesive resin layer 1-3, the polyamide layer 1-4, the third adhesive resin layer 1-5, the bubble polyethylene layer 1-6, the high-strength polyethylene layer 1-7, and the ultra-low temperature polyethylene layer 1-8 are integrally formed after blow molding with a downward water-cooled blowing method;

[0034] The extruded molten object is formed into a tube by the downward water-cooled blowing method, and is cooled while blowing air. The cooled film is made into a wound film through a traction roller and a winding machine. The technical requirements of the downward water-cooled blowing film machine are high-precision control and stability to ensure the production of high-quality film products;

[0035] In practical applications, the reasonable setting of process parameters such as extrusion temperature, blow-up ratio, and traction speed of the downward water-cooled blowing film technology has a crucial impact on the performance and quality of the final film. The matte BOPP layer 2-1 needs to be corona treated. Then, through a printing press, using the surface printing method and polyurethane surface printing ink, printing is carried out on the matte BOPP layer 2-1, and then it is wound into a roll.

[0036] Specific Embodiment Four: Combining Figure 1 and Figure 2 to illustrate this embodiment. A fruit and vegetable co-extruded packaging film with a matte effect in this embodiment, the matte BOPP layer 2-1 includes polypropylene particles and high-strength ethylene particles.

[0037] Specific Embodiment Five: Combining Figure 1 and Figure 2 to illustrate this embodiment. A fruit and vegetable co-extruded packaging film with a matte effect in this embodiment, the first polypropylene layer 2-2 contains polypropylene particles and high-strength polyethylene particles.

[0038] The first polypropylene layer 2-2 specifically comprises 80% polypropylene particles and 20% high-density polyethylene particles.

[0039] Specific Embodiment Six: In combination with Figure 1 and Figure 2 describe this embodiment. A fruit and vegetable co-extruded packaging film with a matting effect in this embodiment, the second polypropylene layer 2-3 comprises polypropylene particles and an antistatic agent;

[0040] The second polypropylene layer specifically comprises 97% polypropylene particles and 3% antistatic agent;

[0041] The antistatic masterbatch is a bipolar substance. It can migrate to the film surface, absorb moisture in the air, form a conductive layer, and dissipate the accumulated charges in time, so that it has the ability to control charging. This ability to dissipate charges is very necessary for the processing and use of polypropylene films. Otherwise, during the production process, due to static electricity, the operators will be electrocuted; when making bags or packaging products, the surface charges will cause the film to adhere to the packaging equipment; for the packaged products, due to static electricity, dust will be adsorbed during storage or sales, affecting the image of the products.

[0042] Specific Embodiment Seven: In combination with Figure 1 and Figure 2 describe this embodiment. A fruit and vegetable co-extruded packaging film with a matting effect in this embodiment, the first adhesive resin layer 1-1 is a maleic anhydride-modified polyolefin resin layer.

[0043] Specific Embodiment Eight: In combination with Figure 1 and Figure 2 describe this embodiment. A fruit and vegetable co-extruded packaging film with a matting effect in this embodiment, the second adhesive resin layer 1-3 is a maleic anhydride-modified polyolefin layer.

[0044] Specific Embodiment Nine: In combination with Figure 1 and Figure 2 describe this embodiment. A fruit and vegetable co-extruded packaging film with a matting effect in this embodiment, the polyamide layer 1-4 is a super-barrier nylon layer;

[0045] The polyamide layer 1-4 being a super-barrier nylon layer has good barrier properties against oxygen and water and has good puncture resistance.

[0046] Specific Embodiment Ten: In combination with Figure 1 and Figure 2 describe this embodiment. A fruit and vegetable co-extruded packaging film with a matting effect in this embodiment, the bubble polyethylene layer 1-6 contains foaming particles, and the ultra-low temperature polyethylene layer 1-8 contains ultra-low temperature particles of 5% metallocene polyethylene;

[0047] Specifically, 2% of foaming particles are added into the bubble polyethylene layer 1-6 to increase its puncture resistance and cushioning performance.

[0048] Specifically, 5% of ultra-low temperature particles are added into the ultra-low temperature polyethylene layer 1-8 to lower its sealing start temperature and avoid the shrinkage of the surface of the matte BOPP caused by heat during high-temperature bag making, thus preventing wrinkles.

[0049] Working principle:

[0050] A composite layer is provided, and the composite layer includes a first adhesive resin layer 1-1, a polyester layer 1-2, a second adhesive resin layer 1-3, a polyamide layer 1-4, a third adhesive resin layer 1-5, a bubble polyethylene layer 1-6, a high-strength polyethylene layer 1-7, and an ultra-low temperature polyethylene layer 1-8; the first adhesive resin layer 1-1 adhesively connects the bottom layer of the matte layer 2 and the top layer of the polyester layer 1-2, the second adhesive resin layer 1-3 adhesively connects the bottom layer of the polyester layer 1-2 and the top layer of the polyamide layer 1-4, the third adhesive resin layer 1-5 adhesively connects the bottom layer of the polyamide layer 1-4 and the top layer of the bubble polyethylene layer 1-6, the bottom layer of the bubble polyethylene 1-6 is connected to the top layer of the high-strength polyethylene layer 1-7, and the bottom layer of the high-strength polyethylene layer 1-7 is connected to the top layer of the ultra-low temperature polyethylene layer 1-8. The first adhesive resin layer 1-1, the polyester layer 1-2, the second adhesive resin layer 1-3, the polyamide layer 1-4, the third adhesive resin layer 1-5, the bubble polyethylene layer 1-6, the high-strength polyethylene layer 1-7, and the ultra-low temperature polyethylene layer 1-8 are integrally formed by downblowing and water-cooling blown film, and then printed by surface printing using polyurethane surface printing ink on the matte BOPP layer 2-1, and then wound into a roll to form a finished product.

Claims

1. A co-extruded packaging film for fruits and vegetables with a matting effect, which comprises a matting layer (2) and an ink layer (3), and is characterized in that, It also includes a composite layer (1), the upper part of the composite layer (1) is connected to the bottom layer of the matte layer (2), the top layer of the matte layer (2) is connected to the bottom layer of the ink layer (3), and the ink layer (3) is a matte surface layer; The composite layer (1) includes a first adhesive resin layer (1-1), a polyester layer (1-2), a second adhesive resin layer (1-3), a polyamide layer (1-4), a third adhesive resin layer (1-5), a foamed polyethylene layer (1-6), a high-strength polyethylene layer (1-7) and an ultra-low temperature polyethylene layer (1-8); The first adhesive resin layer (1-1) adhesively connects the bottom layer of the matte layer (2) and the top layer of the polyester layer (1-2), the second adhesive resin layer (1-3) adhesively connects the bottom layer of the polyester layer (1-2) and the top layer of the polyamide layer (1-4), the third adhesive resin layer (1-5) adhesively connects the bottom layer of the polyamide layer (1-4) and the top layer of the foamed polyethylene layer (1-6), the bottom layer of the foamed polyethylene layer (1-6) is connected to the top layer of the high-strength polyethylene layer (1-7), and the bottom layer of the high-strength polyethylene layer (1-7) is connected to the top layer of the ultra-low temperature polyethylene layer (1-8).

2. The co-extruded packaging film for fruits and vegetables with a matting effect according to claim 1, characterized in that, The matte layer (2) includes a matte BOPP layer (2-1), a first polypropylene layer (2-2) and a second polypropylene layer (2-3); The bottom layer of the matte BOPP layer (2-1) is connected to the top layer of the first polypropylene layer (2-2), the bottom layer of the first polypropylene layer (2-2) is connected to the top layer of the second polypropylene layer (2-3), and the bottom layer of the second polypropylene layer (2-3) is connected to the composite layer (1).

3. The co-extruded packaging film for fruits and vegetables with a matting effect according to claim 2, characterized in that The matte BOPP layer (2-1), the first polypropylene layer (2-2), the second polypropylene layer (2-3), the first adhesive resin layer (1-1), the polyester layer (1-2), the second adhesive resin layer (1-3), the polyamide layer (1-4), the third adhesive resin layer (1-5), the foamed polyethylene layer (1-6), the high-strength polyethylene layer (1-7) and the ultra-low temperature polyethylene layer (1-8) are integrally formed by downblowing and water-cooling blown film.

4. A co-extruded packaging film for fruits and vegetables with a matting effect according to claim 2, characterized in that, The first adhesive resin layer (1-1) is a maleic anhydride modified polyolefin resin layer.

5. The co-extruded packaging film for fruits and vegetables with a matting effect according to claim 3, characterized in that, The second adhesive resin layer (1-3) is a maleic anhydride modified polyolefin layer.

6. A co-extruded packaging film for fruits and vegetables with a matting effect according to claim 3, characterized in that, The polyamide layer (1-4) is a super barrier nylon layer.

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