Packaging composite film and rice packaging bag

Abstract

The single-material packaging composite film comprises tyvek and BOPE (biaxially oriented polyethylene film), a polyurethane glue layer is arranged between the tyvek and the BOPE, the mass of the tyvek and the mass of the BOPE account for not less than 90% of the total mass, the thickness of the tyvek is 150-180 [mu] m, and the thickness of the BOPE accounts for not less than 90% of the total mass of the tyvek. The thickness of the BOPE ranges from 25 micrometers to 50 micrometers, and the gram weight of the Tyvek ranges from 67 g / m < 2 > to 82 g / m < 2 >. The utility model further discloses a rice packaging bag prepared from the composite film.

Description

Technical Field

[0001] The utility model relates to the field of packaging materials, in particular to a packaging composite film and a rice packaging bag. Background Art

[0002] The storage of rice has extremely strict requirements on the environment. There are currently two types of rice packaging bags, namely woven bags (i.e. breathable packaging bags) and soft plastic bags (i.e. non-breathable packaging bags). Soft plastic bags are generally made of polyamide and polyethylene composite materials. Breathable packaging bags are not waterproof and are prone to mold and insects during storage. Soft plastic bags made of polyamide and polyethylene composite materials are not conducive to subsequent plastic recycling and granulation. Utility Model Content

[0003] Aiming at the above problems, the utility model provides a packaging composite film.

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

[0005] A packaging composite film, comprising a flash-steamed nonwoven material, commonly known as Tyvek and BOPE (full name in Chinese: biaxially oriented polyethylene film), the mass of Tyvek and BOPE accounts for no less than 90% of the total mass, a polyurethane glue layer is provided between the Tyvek and BOPE, the thickness of the Tyvek is 150-180 μm, the thickness of the BOPE is 25-50 μm, and the gram weight of the Tyvek is 67-82 g / m 2 .

[0006] In this kind of packaging composite film, Tyvek is made of 100% high-density polyethylene through flash spinning, and BOPE is made of LDPE, LLDPE, and mLLDPE through biaxial stretching. The mass proportion of PE material in the packaging composite film is greater than 90%. The entire composite film can be regarded as a composite film of a single material. Therefore, this kind of composite film can be directly recycled and granulated for reuse after recycling, which is green and environmentally friendly.

[0007] In this kind of composite film, since it is compounded by Tyvek and BOPE via polyurethane glue, Tyvek has the characteristics of light weight, strength, and barrier to microorganisms. It can also be printed with exquisite patterns on its surface through flexographic printing, gravure printing and other technologies. At the same time, since BOPE is thinner, has excellent transverse and longitudinal mechanical properties, and better heat sealing strength after biaxial stretching, this kind of packaging composite film has a relatively light weight and strong tensile strength. Therefore, the packaging bag made of this kind of composite film has good load-bearing performance.

[0008] In summary, this type of packaging film can be roughly regarded as being made of a single material, which is convenient for recycling and granulation for reuse. At the same time, this type of packaging film has a relatively light weight, good tensile strength and good load-bearing performance.

[0009] Optionally, the polyurethane glue layer is a two-component polyurethane glue layer.

[0010] Optionally, the thickness of the Tyvek is 173 μm.

[0011] Optionally, the BOPE has a thickness of 30 μm.

[0012] A rice packaging bag comprises the above-mentioned packaging composite film, wherein two pieces of the above-mentioned single-material packaging composite films are combined together by heat sealing to form a bag body, and the bag body has a bag opening.

[0013] Specifically, when the rice packaging bag is prepared by using the packaging composite film of the single material as described above, it is made by bonding two sheets of composite film, wherein BOPE is used as a heat sealing layer located inside the bag body, and Tyvek is located outside the bag body.

[0014] Optionally, a handle is provided on the bag body.

[0015] Optionally, the handle is a square handle.

[0016] Optionally, the handle is made of hard polyethylene.

[0017] The specific handle is made of high-density polyethylene (HDPE for short in English).

[0018] The utility model has the beneficial effects of being made of a single material, being convenient for recycling and granulating for reuse, and having a relatively light weight, good tensile strength and good load-bearing performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the packaging composite film structure;

[0020] Figure 2 It is a schematic diagram of the structure of a rice packaging bag.

[0021] The reference numerals in the figure are: 1, packaging composite film; 101, Tyvek; 102, polyurethane glue layer; 103, BOPE; 2, handle. DETAILED DESCRIPTION

[0022] The utility model is described in detail below in conjunction with the accompanying drawings.

[0023] Example 1

[0024] As attached Figure 1As shown, a packaging composite film includes Tyvek 101 and BOPE (full name in Chinese: biaxially oriented polyethylene film) 103, the mass of Tyvek and BOPE accounts for no less than 90% of the total mass, a polyurethane glue layer 102 is provided between Tyvek 101 and BOPE 103, the thickness of Tyvek 101 is 150-180 μm, the thickness of BOPE 103 is 25-50 μm, and the gram weight of Tyvek 101 is 67-82 g / m 2 .

[0025] In this packaging composite film, since Tyvek 101 (made of 100% high-density polyethylene) is itself a kind of PE, BOPE 103 is a kind of PE, and the mass of the polyurethane glue layer 102 accounts for less than 10% of the entire composite film, the entire composite film can be approximately regarded as being made entirely of PE, and the entire composite film can be regarded as a composite film of a single material, so this composite film can be directly recycled and granulated for reuse after recycling.

[0026] In this composite film, since it is made of Tyvek 101 and BOPE103 through polyurethane glue, Tyvek 101 has the characteristics of light weight, strong toughness and barrier to microorganisms, and BOPE103 is thinner, has excellent transverse and longitudinal mechanical properties, and has better heat sealing strength, so this packaging composite film has a relatively light weight and strong tensile strength. Therefore, the packaging bag made of this composite film has good load-bearing performance.

[0027] In summary, this type of packaging film can be roughly regarded as being made of a single material, which is convenient for recycling and granulation for reuse. At the same time, this type of packaging film has a relatively light weight, good tensile strength and good load-bearing performance.

[0028] In this embodiment, the polyurethane glue layer 102 is a two-component polyurethane glue layer 102 .

[0029] In this embodiment, the thickness of Tyvek 101 may be 173 μm.

[0030] In this embodiment, the thickness of BOPE 103 may be 30 μm.

[0031] Example 2

[0032] A rice packaging bag comprises a packaging composite film 1 as shown in Example 1. Two pieces of packaging composite films 1 as shown in Example 1 are combined together to form a bag body by heat sealing. Each bag sheet of the bag body is a packaging composite film 1. The bag body has a bag opening (located at the top).

[0033] Specifically, when the above-mentioned single-material packaging composite film is used to prepare a rice packaging bag, it is made by bonding two composite films, wherein BOPE is used as a heat-sealing layer located inside the bag body, and Tyvek is located on the outside of the bag body.

[0034] A handle 2 is provided on the bag body.

[0035] The handles are square.

[0036] The handles are made of rigid polyethylene.

[0037] The handle is made of high-density polyethylene (HDPE for short) and can be installed on the bag body by bonding or punching.

[0038] The above description is only a preferred embodiment of the present invention, and does not limit the patent protection scope of the present invention. Any equivalent transformations made using the contents of the present invention specification, directly or indirectly used in other related technical fields, are also included in the protection scope of the present invention.

Claims

1. A packaging composite film, characterized in that: It includes Tyvek and BOPE, wherein a polyurethane glue layer is arranged between the Tyvek and the BOPE, and the thickness of the Tyvek is 150-180 μm, the thickness of the BOPE is 25-50 μm, and the gram weight of the Tyvek is 67-82 g / m 2 .

2. The packaging composite film according to claim 1, characterized in that: The polyurethane glue layer is a two-component polyurethane glue layer.

3. The packaging composite film according to claim 1, characterized in that: The thickness of the Tyvek is 173 μm.

4. The packaging composite film according to claim 1, characterized in that: The thickness of the BOPE is 30 μm.

5. A rice packaging bag, characterized in that: The invention comprises the packaging composite film according to any one of claims 1 to 4, wherein the packaging composite films are combined together to form a bag body, and the bag body has a bag opening.

6. The rice packaging bag according to claim 5, characterized in that: The bag body is provided with a handle.

7. The rice packaging bag according to claim 6, characterized in that: The handle is a square handle.

8. The rice packaging bag according to claim 6, characterized in that: The handle is made of hard polyethylene.

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