A single polyolefin material composite package and method of manufacture

Abstract

The application provides a single polyolefin material composite packaging and a preparation method thereof. The packaging comprises, from outside to inside, an outer polyolefin printing layer, an outer adhesive layer, a barrier layer, an inner adhesive layer and a polyolefin heat sealing layer. The single polyolefin material composite packaging and the preparation method thereof realize the single packaging material, and the packaging tube forming is good, the hose packaging deformation recovers quickly, and recycling is facilitated.

Description

TECHNICAL FIELD

[0001] The present application relates to daily oral care and other care packaging, in particular to a single polyolefin material composite packaging. BACKGROUND

[0002] The conventional composite sheet packaging is mostly plastic aluminum plastic composite film structure, and the non-recyclable structure includes PE / AL / PE, PE / MPET / PE, PE / EVOH / PE, etc., and the recyclable structure includes plastic extruded hose, etc.; the non-recyclable packaging film does not meet the increasingly severe environmental protection trend, and the recyclable packaging film usually has poor size stability, friction coefficient, appearance after packaging, etc., and it is difficult to completely meet the expectations of customers. At present, although the aluminum plastic composite film can be recycled, in fact, there are few recycling enterprises and serious pollution, and the recycling and utilization technology is not mature, so recycling is relatively difficult. Some traditional aluminum plastic sheet structures are INK / PE / AL / PE, INK / PE / MPET / PE, etc., and the surface has the problems of poor tube forming property, slow hose deformation recovery ability, and difficulty in separation and recycling, and the conventional burial recycling of aluminum plastic sheet causes heavy metal pollution, and the cremation recycling causes the problem of board hardening of the incinerator.

[0003] The existing plastic composite film packaging is difficult to simultaneously meet the requirements of environmental protection and biodegradability, size and friction coefficient stability, fine appearance after packaging, high barrier, etc. The existing PE single material film bag mostly adopts the PE / PE material structure, and both layers of PE are ordinary polyethylene resin, which cannot meet the requirements of high-quality products in terms of moisture resistance, oxygen resistance and aroma retention. If a multi-layer co-extrusion high-barrier PE material structure is used, because the high-barrier material is mostly EVOH, PA, PVDC and other materials, a certain thickness (≥3 μm) is required to have sufficient barrier property, and the above materials have poor compatibility with the PE material, and need to add connecting resin (≥4 μm) for cooperation during processing, thus inevitably causing a high content of non-polyethylene components in the multi-layer co-extrusion film. The above materials have very low compatibility with polyethylene, which reduces the recycling utilization rate and increases the difficulty of secondary processing. Moreover, the multi-layer co-extrusion equipment needs to be used, which has a very high cost, and the film manufacturing cost of the packaging is high, the production and processing are difficult, the waste rate is increased, great waste is caused, and the requirements of circular packaging cannot be met. SUMMARY

[0004] In order to solve the above technical problems, the present application provides a single polyolefin material composite packaging and a preparation method thereof, which realizes the single packaging material while having good tube forming, fast hose packaging deformation recovery and easy separation and recycling.

[0005] In order to achieve the object of the present application, the present application provides a single polyolefin material composite packaging, which comprises, from outside to inside, an outer polyolefin printing layer, an outer adhesive layer, a barrier layer, an inner adhesive layer and a polyolefin heat sealing layer; the outer adhesive layer comprises one of ethylene acrylic acid modified polyethylene, single-component polyurethane, two-component polyurethane, polyether adhesive, or the outer adhesive layer comprises at least one of LDPE and HDPE; the inner adhesive layer comprises one of ethylene acrylic acid modified polyethylene, single-component polyurethane, two-component polyurethane, polyether adhesive, or the inner adhesive layer comprises at least one of LDPE and HDPE. Wherein, the outer adhesive layer is used to composite the outer polyolefin printing layer and the barrier layer, and the inner adhesive layer is used to composite the barrier layer and the polyolefin heat sealing layer.

[0006] Preferably, the outer polyolefin printing layer is a mixture of any two or more of low-density polyethylene, medium-density polyethylene, high-density polyethylene, metallocene polyethylene, homopolymer polypropylene, copolymer polypropylene, and random polypropylene. Preferably, the thickness of the outer polyolefin printing layer is 50-150 μm.

[0007] Preferably, the outer polyolefin printing layer is composed of low-density polyethylene, medium-density polyethylene, high-density polyethylene, and metallocene polyethylene, and the mass percentage is 20-40%, 10-30%, 30-50%, and 10-20%.

[0008] Preferably, the barrier layer adopts one or more of a metalized film, an inorganic oxide coated film, an organic coated film, a uniaxially or biaxially stretched monolayer film, a uniaxially stretched multilayer co-extruded film, a biaxially stretched multilayer co-extruded film, a multilayer co-extruded NY / PA film, an organic coated barrier film, and an inorganic coated barrier film.

[0009] Further preferably, the barrier layer adopts one or more of a metalized polyolefin film, an inorganic oxide coated polyolefin film, an organic coated polyolefin film, a uniaxially or biaxially stretched monolayer polyethylene film, a uniaxially stretched multilayer co-extruded polyolefin film, a biaxially stretched multilayer co-extruded polyolefin film, a multilayer co-extruded NY / PA polyolefin film, an organic coated polyolefin barrier film, and an inorganic coated polyolefin barrier film.

[0010] Preferably, the metalized film is a metalized polyvinyl alcohol.

[0011] Preferably, the metalized polyolefin film is an aluminum coated polyethylene or an aluminum coated polypropylene, and the inorganic oxide coated polyolefin film is an aluminum oxide coated polyethylene or an aluminum oxide coated polypropylene or a silicon oxide coated polyethylene or a silicon oxide coated polypropylene.

[0012] Preferably, the thickness of the barrier layer is 12-150 μm.

[0013] Preferably, the polyolefin heat-seal layer is any two or more of low-density polyethylene, medium-density polyethylene, high-density polyethylene, metallocene polyethylene, homopolymer polypropylene, copolymer polypropylene, random polypropylene.

[0014] Preferably, the thickness of the polyolefin heat-seal layer is 50-150 μm.

[0015] Preferably, the polyolefin heat-seal layer is composed of 20-40% metallocene polyethylene, 20-30% high-density polyethylene, 10-30% low-density polyethylene, and 30-50% medium-density polyethylene.

[0016] Preferably, the outer adhesive layer is composed of 50-100% LDPE and 0-50% HDPE.

[0017] Preferably, the inner adhesive layer is composed of 50-100% LDPE and 0-50% HDPE.

[0018] Further, the present application provides a method for preparing the single polyolefin material composite packaging, comprising the following steps:

[0019] Step 1: selecting polyolefin raw materials required for processing the outer polyolefin printing layer, and blowing the polyolefin raw materials according to the corresponding proportions of the polyolefin raw materials by using a three-layer blowing equipment to obtain the outer polyolefin printing layer; selecting polyolefin raw materials required for the polyolefin heat-seal layer, and blowing the polyolefin raw materials according to the corresponding proportions of the polyolefin raw materials by using a three-layer blowing equipment to obtain the polyolefin heat-seal layer;

[0020] Step 2:

[0021] Processing the barrier layer by using one or more of the following methods:

[0022] (1) performing single-layer or multi-layer co-extrusion process on the film;

[0023] or (2) performing unidirectional or bidirectional stretching process on the film;

[0024] Through the above stretching process and multi-layer extrusion process, unidirectional or bidirectional stretched single-layer film, unidirectional stretched multi-layer co-extruded film, bidirectional stretched multi-layer co-extruded film, and multi-layer co-extruded NY / PA film can be obtained.

[0025] or (3) depositing a metal layer, an inorganic oxide layer, or an organic substance on the surface of the film; through the above treatment, a metal-deposited film, an inorganic oxide-deposited film, or an organic substance-deposited film can be obtained.

[0026] or (4) coating the surface of the film with an organic substance or an inorganic substance to obtain an organic substance-coated film or an inorganic substance-coated film.

[0027] Step three: set the adhesive material between the outer polyolefin printing layer and the barrier layer, and between the barrier layer and the polyolefin heat sealing layer, so that the outer polyolefin printing layer, the barrier layer and the polyolefin heat sealing layer are sequentially compounded to obtain a composite film;

[0028] Step four: cutting the composite film into the required width by a slitting machine.

[0029] The beneficial effects of the present application compared with the prior art are:

[0030] Compared with the traditional aluminum plastic sheet material, the single polyolefin material composite packaging of the present application realizes the single material target; realizes the recycling of materials, prolongs the life cycle of materials, reduces carbon emissions, and at the same time reduces the application of metal aluminum elements, which can solve the difficulty of separation and recycling of aluminum plastic materials in the past.

[0031] The single material composite packaging of the present application has stable size and friction coefficient, stable composite strength value and meets the high barrier performance requirements of the customer end.

[0032] The single polyolefin material composite packaging of the present application meets the customer demand for long shelf life, can realize long-term shelf life of the content product, ensures the functionality of the content, and meets the demand for single material de-aluminized packaging product.

[0033] The low content of non-polyolefin components in the composite packaging of the present application improves the recycling rate and reduces the difficulty of recycling and recycling of recycled materials. BRIEF DESCRIPTION OF DRAWINGS

[0034] Figure 1 is a structure diagram of the single polyolefin material composite packaging of the present application;

[0035] In the figure: outer polyolefin printing layer 1; outer adhesive layer 2; barrier layer 3; inner adhesive layer 4; polyolefin heat sealing layer 5. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical scheme and advantages of the present application clearer and more apparent, the following examples will further illustrate the present application. Based on the examples in the present application, all other examples obtained by those skilled in the art without creative labor fall within the scope of the present application.

[0037] As shown in the accompanying Figure 1As shown, the single polyolefin material composite packaging in the present embodiment includes, from the outside to the inside, an outer polyolefin printing layer 1, an outer adhesive layer 2, a barrier layer 3, an inner adhesive layer 4, and a polyolefin heat sealing layer 5. The outer polyolefin printing layer 1 and the polyolefin heat sealing layer 5 are selected from any two or more of low-density polyethylene, medium-density polyethylene, high-density polyethylene, metallocene polyethylene, homopolypropylene, copolypropylene, and random polypropylene; the outer adhesive layer 2 includes one of ethylene acrylic acid modified polyethylene, single-component polyurethane, two-component polyurethane, and polyether-based glue, or the outer adhesive layer 2 includes at least one of LDPE and HDPE; and the inner adhesive layer 4 includes one of ethylene acrylic acid modified polyethylene, single-component polyurethane, two-component polyurethane, and polyether-based glue, or the inner adhesive layer 4 includes at least one of LDPE and HDPE.

[0038] The barrier layer is selected from one or more of a metal-coated polyolefin film, an inorganic oxide-coated polyolefin film, an organic-coated polyolefin film, a unidirectional or bidirectional stretched single-layer polyethylene film, a unidirectional stretched multi-layer co-extrusion polyolefin film, a bidirectional stretched multi-layer co-extrusion polyolefin film, a multi-layer co-extrusion NY / PA polyolefin film, an organic-coated polyolefin barrier film, and an inorganic-coated polyolefin barrier film. In the specific embodiment of the present embodiment, polyethylene is selected as the polyolefin.

[0039] In the present embodiment, the unidirectional stretched multi-layer co-extrusion polyethylene film and the bidirectional stretched multi-layer co-extrusion polyethylene film are 3-11 layers, and the multi-layer co-extrusion NY / PA polyethylene film is 5-11 layers.

[0040] The preparation method of the single polyolefin material composite packaging described above includes the following steps:

[0041] Step 1: Select the polyolefin raw material required for processing the outer polyolefin printing layer 1, and blow mold the outer polyolefin printing layer by using a three-layer blow molding device according to the corresponding proportion of the polyolefin raw material; select the polyolefin raw material required for the polyolefin heat sealing layer 5, and blow mold the polyolefin heat sealing layer by using a three-layer blow molding device according to the corresponding proportion of the polyolefin raw material;

[0042] Step 2: Process the barrier layer 3, and the processing method is one or more of the following methods:

[0043] (1) Single-layer or multi-layer co-extrusion process is performed on the film;

[0044] Or (2) unidirectional or bidirectional stretching process is performed on the film;

[0045] By the above stretching process, multi-layer extrusion process can be obtained such as unidirectional or bidirectional stretching single-layer film, unidirectional stretching multi-layer co-extrusion film, bidirectional stretching multi-layer co-extrusion film, multi-layer co-extrusion NY / PA film;

[0046] Or (3) the film surface is evaporated with a metal layer, an inorganic oxide layer, an organic matter; By the above treatment can be obtained such as metal plating layer film, inorganic oxide plating film, organic matter plating film;

[0047] Or (4) the film surface is coated with an organic or inorganic matter, to obtain a coated organic film or a coated inorganic film;

[0048] Step three: setting the adhesive material between the outer polyolefin printing layer 1 and the barrier layer 3, and between the barrier layer 3 and the polyolefin heat sealing layer 5, so that the outer polyolefin printing layer 1, the barrier layer 3 and the polyolefin heat sealing layer 5 are sequentially compounded to obtain a composite film; In this specific embodiment, one of solvent-free compounding, dry compounding and extrusion compounding is used.

[0049] Step four: cutting the composite film into the required width by a slitting machine.

[0050] The following is illustrated by a plurality of specific examples to explain the specific operation and effect of the technical scheme of the present application.

[0051] As shown in the following table, the material composition and thickness used in each layer of the composite material packaging of single polyolefin material in examples 1-8 are listed. In the table, as shown in the outer polyolefin printing layer of example 1: 20% LDPE, 30% MDPE, 40% HDPE, 10% metallocene polyethylene; 100 μm. It means that the mass percentage of the components in the outer polyolefin printing layer is: 20% LDPE, 30% MDPE, 40% HDPE, 10% metallocene polyethylene, and the thickness is 100 μm.

[0052] Outer polyolefin print layer Outer tie layer Barrier layer Inner tie layer Polyolefin heat seal layer Example 1 20% LDPE, 30% MDPE, 40% HDPE, 10% metallocene polyethylene; 100 μm Bicomponent polyurethane 3-5 g / m2 2 μm Aluminium-coated PE; 50 μm 80% LDPE 20% HDPE 20 μm 25% metallocene polyethylene, 30% HDPE, 15% LDPE, 30% MDPE; 100 μm Example 2 20% LDPE, 30% MDPE, 40% HDPE, 10% metallocene polyethylene; 100 μm Bicomponent polyurethane 3-5 g / m2 2 μm Aluminium-coated PE; 50 μm 80% LDPE 20% HDPE 20 μm 25% metallocene polyethylene, 30% HDPE, 15% LDPE, 30% MDPE; 100 μm Example 3 20% LDPE, 30% MDPE, 40% HDPE, 10% metallocene polyethylene; 100 μm Monocomponent polyurethane 2-3 g / m2 2 μm Aluminium-coated polyvinyl alcohol; 25 μm 100% LDPE 20 μm 25% metallocene polyethylene, 30% HDPE, 15% LDPE, 30% MDPE; 100 μm Example 4 40% LDPE, 10% MDPE, 30% HDPE, 20% metallocene polyethylene; 100 μm Bicomponent polyurethane 3-5 g / m2 2 μm Aluminium-coated polyvinyl alcohol; 25 μm Bicomponent polyurethane 3-5 g / m2 2 μm 25% metallocene polyethylene, 30% HDPE, 15% LDPE, 30% MDPE; 100 μm Example 5 30% LDPE, 20% MDPE, 40% HDPE, 10% metallocene polyethylene; 50 μm 100% LDPE 20 μm Uniaxially stretched polyethylene film; 12 μm 100% LDPE 20 μm 40% metallocene polyethylene, 20% HDPE, 10% LDPE, 30% MDPE; 50 μm Example 6 20% LDPE, 20% MDPE, 50% HDPE, 10% metallocene polyethylene; 150 μm 50% LDPE 50% HDPE 20 μm Biaxially stretched polyethylene film; 25 μm 50% LDPE 50% HDPE 20 μm 20% metallocene polyethylene, 25% HDPE, 20% LDPE, 35% MDPE; 150 μm Example 7 20% LDPE, 20% MDPE, 40% HDPE, 20% metallocene polyethylene; 70 μm 100% LDPE 15 μm Multilayer polyethylene co-extruded film; 150 μm 100% LDPE 15 μm 20% metallocene polyethylene, 20% HDPE, 10% LDPE, 50% MDPE; 70 μm Example 8 23% LDPE, 23% MDPE, 42% HDPE, 12% metallocene polyethylene; 80 μm 50% LDPE 50% HDPE 20 μm Polyamide and polyethylene co-extruded film; 70 μm 50% LDPE 50% HDPE 20 μm 20% metallocene polyethylene, 20% HDPE, 10% LDPE, 50% MDPE; 70 μm Example 8 23% LDPE, 23% MDPE, 42% HDPE, 12% metallocene polyethylene; 80 μm 50% LDPE 50% HDPE 20 μm Polyamide and polyethylene co-extruded film; 70 μm 50% LDPE 50% HDPE 20 μm 20% metallocene polyethylene, 20% HDPE, 10% LDPE, 50% MDPE; 70 μm 20% metallocene polyethylene, 20% HDPE, 30% LDPE, 30% MDPE; 80 μm Comparative Example 1 23% LDPE, 23% MDPE, 42% HDPE, 12% metallocene polyethylene; 120 μm 80% modified polyethylene 10% LDPE 10% HDPE 20 μm Aluminium foil 12 μm 80% modified polyethylene 10% LDPE 10% HDPE 20 μm 25% metallocene polyethylene, 30% HDPE, 15% LDPE, 30% MDPE; 58 μm Comparative Example 1 23% LDPE, 23% MDPE, 42% HDPE, 12% metallocene polyethylene; 120 μm 100% LDPE 30 μm Polyvinyl alcohol 70 μm 100% LDPE 30 μm 25% metallocene polyethylene, 30% HDPE, 15% LDPE, 30% MDPE; 58 μm

[0053] Example 1

[0054] Step one: selecting 20% LDPE, 30% MDPE, 40% HDPE, 10% metallocene polyethylene required for processing the outer polyolefin printing layer 1, and blowing by three-layer blowing equipment according to the above proportion of polyolefin raw materials to obtain the outer polyolefin printing layer, the thickness of the outer polyolefin printing layer 1 is 100 μm; Selecting 25% metallocene polyethylene, 30% HDPE, 15% LDPE, 30% MDPE required for polyolefin heat sealing layer 5, and blowing by three-layer blowing equipment according to the corresponding proportion of polyolefin raw materials to obtain polyolefin heat sealing layer, the thickness of the polyolefin heat sealing layer 5 is 100 μm;

[0055] Step two: process the barrier layer 3, take polyethylene PE as the base film, evaporate aluminum oxide on the surface of the polyethylene PE; through the electroplating box, in the vacuum environment, liquefy the aluminum wire, use the electron gun to accelerate the aluminum gas to spray on the base film, and quickly cool the material to make the plated layer material.

[0056] Step three: set the adhesive material between the outer polyolefin printing layer 1 and the barrier layer 3, and between the barrier layer 3 and the polyolefin heat sealing layer 5, so that the outer polyolefin printing layer 1, the barrier layer 3, and the polyolefin heat sealing layer 5 are sequentially compounded to obtain a composite film; the compounding is solvent-free compounding; wherein the outer adhesive layer uses two-component polyurethane, and the inner adhesive layer uses LDPE and HDPE mixture.

[0057] Step four: cut the composite film into the required width through the slitting machine.

[0058] Example 2

[0059] The main difference between Example 2 and Example 1 is that the barrier layer uses aluminum-plated PE, and the thickness is 50 μm.

[0060] Example 3

[0061] The main difference between Example 3 and Example 1 is that the barrier layer uses aluminum-plated polyvinyl alcohol, and the thickness is 25 μm; the outer adhesive layer uses single-component polyurethane, and the inner adhesive layer uses LDPE.

[0062] Example 4

[0063] The main difference between Example 4 and Example 1 is the outer polyolefin printing layer, the barrier layer, and the inner adhesive layer, which are described in detail in the table.

[0064] Example 5

[0065] Example 5 and Example 1 are different in each layer, which is described in detail in the table. And step three uses dry compounding.

[0066] Example 6

[0067] Example 6 and Example 1 are different in each layer, which is described in detail in the table. And step three uses extrusion compounding.

[0068] Example 7

[0069] Example 7 and Example 1 are different in each layer, which is described in detail in the table. In this example, a 5-layer co-extrusion method is used to make the barrier layer film. Step three uses solvent-free compounding.

[0070] Example 8

[0071] Example 8 is different from each layer of example 1, see table. Step two is to use polyamide and polyethylene as raw material by multilayer co-extrusion process to get multilayer polyethylene, polyamide composite co-extrusion barrier layer film. In this embodiment, 7 layer co-extrusion is used, under high temperature conditions, maleic anhydride modified material is used to bond polyethylene and polyamide. Step three uses solventless composite.

[0072] Comparative example 1

[0073] Using extrusion type composite production process route, using modified polyethylene, LDPE, HDPE mixed components as adhesive layer, through extrusion bonding to bond aluminum foil and polyethylene. The specific difference of each layer is shown in the table.

[0074] Comparative example 2

[0075] Using extrusion type composite production process route, using polyethylene and polyvinyl alcohol co-extrusion multilayer composite film. The specific difference of each layer is shown in the table.

[0076] Table 1 performance test of example and comparative example

[0077] Oxygen barrier (cm3 / m2.day) Water barrier (g / m2.day) Polyethylene proportion content Example 1 2.2 0.8 99% Example 2 2.2 0.6 99% Example 3 0.2 0.18 95% Example 4 0.15 0.12 95% Example 5 1.5 0.6 100% Example 6 1.2 0.2 100% Example 7 70 0.8 100% Example 8 0.3 0.6 94% Comparative Example 1 0.05 0.08 88% Comparative Example 2 1.2 0.8 92%

[0078] From the test results in the above table, it can be seen that the oxygen and water blocking performance of the polyethylene in the multiple examples can still meet the customer's demand when the content of polyethylene is more than 98%, especially the oxygen blocking coefficient of example 7 reaches 70, the performance is excellent, and because the content of polyethylene is high, the recycling is simple, and the environmental pollution is reduced; Although the content of polyethylene in example 8 is 94%, the oxygen and water blocking performance is much higher than that of similar products on the market. The content of polyethylene in comparative examples 1-2 is obviously lower than that of examples 1-8 of the present application, recycling is difficult, and the comprehensive performance of oxygen and water blocking is not ideal. It can be seen that the single polyolefin packaging product of the present application is superior to the similar products of the prior art in environmental friendliness and use performance.

[0079] In summary, although the present application has been disclosed as above with preferred embodiments, the above preferred embodiments are not intended to limit the present application, and those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present application, therefore the protection scope of the present application is subject to the scope defined by the claims.

Claims

1. A single polyolefin material composite package, characterized by, The packaging comprises, from outside to inside, an outer polyolefin printing layer, an outer adhesive layer, a barrier layer, an inner adhesive layer and a polyolefin heat sealing layer; the outer adhesive layer comprises one of ethylene acrylic acid modified polyethylene, single-component polyurethane, two-component polyurethane, polyether glue, or the outer adhesive layer comprises at least one of LDPE and HDPE; the inner adhesive layer comprises one of ethylene acrylic acid modified polyethylene, single-component polyurethane, two-component polyurethane, polyether glue, or the inner adhesive layer comprises at least one of LDPE and HDPE; the outer polyolefin printing layer is a mixture of any two or more of low-density polyethylene, medium-density polyethylene, high-density polyethylene, metallocene polyethylene, homopolymer polypropylene, copolymer polypropylene and random polypropylene; the barrier layer is one or more of a metal-coated layer film, an inorganic oxide-coated film, an organic-coated film, a unidirectional or bidirectional stretched single-layer film, a unidirectional stretched multi-layer co-extrusion film, a bidirectional stretched multi-layer co-extrusion film, a multi-layer co-extrusion NY / PA film, an organic-coated barrier film and an inorganic-coated barrier film; and the polyolefin heat sealing layer is a mixture of any two or more of low-density polyethylene, medium-density polyethylene, high-density polyethylene, metallocene polyethylene, homopolymer polypropylene, copolymer polypropylene and random polypropylene.

2. The single polyolefin material composite package of claim 1, wherein, The thickness of the outer polyolefin printing layer is 50-150 μm.

3. The single polyolefin material composite package according to claim 1 or 2, characterized in that, The outer polyolefin printing layer is composed of low-density polyethylene, medium-density polyethylene, high-density polyethylene and metallocene polyethylene, and the mass percentage is 20-40%, 10-30%, 30-50% and 10-20%.

4. The single polyolefin material composite package of claim 1, wherein, The barrier layer is one or more of a metal-coated layer polyolefin film, an inorganic oxide-coated polyolefin film, an organic-coated polyolefin film, a unidirectional or bidirectional stretched single-layer polyethylene film, a unidirectional stretched multi-layer co-extrusion polyolefin film, a bidirectional stretched multi-layer co-extrusion polyolefin film, a multi-layer co-extrusion NY / PA polyolefin film, an organic-coated polyolefin barrier film and an inorganic-coated polyolefin barrier film.

5. The single polyolefin material composite package of claim 1, wherein, The metal-coated layer film is a metal-coated layer polyvinyl alcohol.

6. The single polyolefin material composite package of claim 4, wherein, The metal-coated layer polyolefin film is aluminum-coated polyethylene or aluminum-coated polypropylene, and the inorganic oxide-coated polyolefin film is aluminum oxide-coated polyethylene or aluminum oxide-coated polypropylene or silicon oxide-coated polyethylene or silicon oxide-coated polypropylene.

7. The single polyolefin material composite package according to any one of claims 4-6, wherein, The thickness of the barrier layer is 12-150 μm.

8. The single polyolefin material composite package of claim 1, wherein, The thickness of the polyolefin heat sealing layer is 50-150 μm.

9. The single polyolefin material composite package according to claim 1 or 8, wherein, The polyolefin heat sealing layer is composed of 20-40% metallocene polyethylene, 20-30% high-density polyethylene, 10-30% low-density polyethylene and 30-50% medium-density polyethylene.

10. The single polyolefin material composite package of claim 1, wherein, The outer adhesive layer is composed of 50-100% LDPE and 0-50% HDPE.

11. The single polyolefin material composite package of claim 1, wherein, The inner adhesive layer is composed of 50-100% LDPE and 0-50% HDPE.

12. The method of producing a single polyolefin material composite package according to any one of claims 1 to 11, characterized in that, The method comprises the following steps: Step one: select the polyolefin raw material required for processing the outer polyolefin printing layer, according to the corresponding proportion of the polyolefin raw material, using three-layer blow molding equipment to blow molding, get the outer polyolefin printing layer; select the polyolefin raw material required for processing the polyolefin heat sealing layer, according to the corresponding proportion of the polyolefin raw material, using three-layer blow molding equipment to blow molding, get the polyolefin heat sealing layer; Step two: process the barrier layer, the processing method is one or more of the following ways: (1) the film is subjected to single-layer, multi-layer co-extrusion process; Or (2) the film is subjected to unidirectional or bidirectional stretching process; Or (3) the film surface is coated with a metal layer, an inorganic oxide layer, or an organic matter; Or (4) the film surface is coated with an organic or inorganic material to obtain an organic-coated film or an inorganic-coated film; Step three: set the bonding material between the outer polyolefin printing layer and the barrier layer, and between the barrier layer and the polyolefin heat sealing layer, so that the outer polyolefin printing layer, the barrier layer, and the polyolefin heat sealing layer are sequentially compounded to obtain a composite film; Step four: cut the composite film into the required width by a slitting machine.

Images