Oxygen barrier packaging paper

Abstract

The utility model provides oxygen-barrier packaging paper which comprises a base material layer, an oxygen-barrier bottom coating, an oxygen-barrier surface coating and a protective layer are sequentially arranged on the surface of the base material layer, the base material layer is 100% wood pulp base paper, the oxygen-barrier bottom coating is a polyvinyl alcohol coating layer, the oxygen-barrier surface coating is an ethylene-ethyl acrylate copolymer coating layer, and the protective layer is a polyvinyl alcohol coating layer. And the protective layer is a polyurethane coating layer. The base material layer provides basic strength and a supporting effect for the packaging paper, the oxygen barrier layer is composed of an oxygen barrier bottom coating and an oxygen barrier surface coating, the oxygen barrier bottom coating gives a layer of coating to the rough surface of the base material layer, the oxygen barrier surface coating gives a layer of coating to the oxygen barrier bottom coating, the protective layer is a third coating layer attached to the oxygen barrier layer, and the protective layer is a fourth coating layer attached to the oxygen barrier layer. The surface protective layer enhances the durability, waterproofness and heat sealability of the packaging paper, the packaging paper has excellent oxygen barrier performance through multiple times of coating, the shelf life of food and drugs can be effectively prolonged, and the packaging paper is made of environment-friendly materials and meets the requirement of sustainable development.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of packing paper, and particularly relates to an oxygen barrier packing paper. BACKGROUND

[0002] Oxygen is one of the main factors leading to the deterioration of food, medicine and other products. The traditional packaging material, due to the porous fiber structure of the base paper itself, is a material containing micropores on the micro level, and the surface is rough. It is difficult to close the pores by using ordinary coating process, and the oxygen barrier performance is poor, which cannot effectively prolong the shelf life of the product. With the improvement of people's requirements for food safety and quality, it is of great significance to develop a packaging paper with simple structure, low cost, environmental protection and excellent oxygen barrier performance.

[0003] The oxygen barrier packing paper in the prior art generally composites an aluminum foil or an aluminum plating layer on the surface of a paper base material as a barrier layer, or uses a plastic film layer as a barrier layer. The oxygen barrier is achieved by using the aluminum plating layer or the aluminum foil layer, which is high in price and inconvenient to recycle or high in recycling cost. The oxygen barrier is achieved by using the plastic film layer, which is not easy to degrade or recycle, and does not meet the requirements of plastic limitation and reduction. SUMMARY

[0004] In view of the above problems existing in the prior art, the utility model provides an oxygen barrier packing paper.

[0005] The utility model discloses the purpose is realized in the following mode:

[0006] An oxygen barrier packing paper, comprising a base material layer, an oxygen barrier bottom coating layer, an oxygen barrier surface coating layer and a protective layer are sequentially arranged on the surface of the base material layer, the base material layer is 100% wood pulp base paper, the oxygen barrier bottom coating layer is a polyvinyl alcohol coating layer, the oxygen barrier surface coating layer is an ethylene-ethyl acrylate copolymer coating layer, and the protective layer is a polyurethane coating layer.

[0007] The base material layer is white kraft paper or food packaging paper with a grammage of 55-60 gsm and a roughness of 6.0-8.0 μm.

[0008] The coating amount of the polyvinyl alcohol coating layer is 2.0-3.0 gsm.

[0009] The coating amount of the ethylene-ethyl acrylate copolymer coating layer is 3.0-5.0 gsm.

[0010] The coating amount of the polyurethane coating layer is 4.0-5.0 gsm.

[0011] The oxygen barrier bottom coating layer and the oxygen barrier surface coating layer are formed by curtain coating, and the protective layer is formed by light bar coating.

[0012] The oxygen barrier packaging paper provided by the utility model has excellent oxygen barrier performance through multiple coating, can effectively prolong the shelf life of food and medicine, adopts environment-friendly materials, and meets the requirements of sustainable development. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 It is the structure schematic diagram of the utility model. DETAILED DESCRIPTION

[0014] The utility model will be further explained in combination with the drawings and specific embodiments. It should be understood that these embodiments are only used for illustrating the utility model, and are not used for limiting the scope of the utility model, and after reading the content of the utility model, those skilled in the art can make various changes or modifications to the utility model, and these equivalent forms are also within the range defined by the utility model.

[0015] As Figure 1 The oxygen barrier packaging paper includes substrate layer 1, and substrate layer 1 surface is sequentially provided with oxygen barrier bottom coating layer 2, oxygen barrier surface coating layer 3 and protective layer 4, substrate layer 1 is 100% wood pulp base paper, oxygen barrier bottom coating layer 2 is polyvinyl alcohol coating layer, oxygen barrier surface coating layer 3 is ethylene-ethyl acrylate copolymer coating layer, and protective layer 4 is polyurethane coating layer, the protective layer can be heat sealed, and subsequent bag making is convenient.

[0016] Substrate layer 1 is white kraft paper or food packaging paper with grammage 55-60gsm and roughness 6.0-8.0 μm.

[0017] Further, polyvinyl alcohol coating layer uses coating agent with polyvinyl alcohol (PVA) as main component, and coating amount is preferably 2.0-3.0gsm, which has good barrier performance and bonding performance.

[0018] Further, the coating amount of ethylene-ethyl acrylate copolymer coating layer is 3.0-5.0gsm. Ethylene-ethyl acrylate is a material copolymerized by ethylene and ethyl acrylate, which has good heat resistance and transparency.

[0019] Further, the coating amount of polyurethane coating layer is 4.0-5.0gsm. Polyurethane is a high molecular compound, which has good waterproofness and heat sealing property.

[0020] Example 1

[0021] The base layer is selected as high strength white kraft paper made of 100% wood pulp with a surface roughness of 6.35 μm and a basis weight of 55.2 gsm.

[0022] The oxygen barrier primer layer is formed by using a coating solution of polyvinyl alcohol 1799 with a solid content of 4.7%, a pH value of 8.11 and a viscosity of 115 mPa.S at a temperature of 70°C, and a coating amount of about 3.0 gsm by curtain coating. Further, a small amount of surfactant, such as fatty alcohol polyoxyethylene ether, is added to the coating solution to increase the surface tension of the coating solution and to make the coating solution spread evenly on the paper.

[0023] The oxygen barrier top coating layer is formed by using a coating solution of ethyl acrylate with a solid content of 20.0%, a viscosity of 150-220 cps and a pH value of 7.00-9.00 at room temperature, and a coating amount of about 4.0 gsm by curtain coating. Further, a small amount of surfactant, such as fatty alcohol polyoxyethylene ether, is added to the coating solution to increase the surface tension of the coating solution and to make the coating solution spread evenly on the paper.

[0024] The protective layer is formed by using a coating solution of polyurethane with a solid content of 20.0-35.0%, a viscosity of 120-180 cps and a pH value of 7.00-9.00 at room temperature, and a coating amount of about 4.5 gsm by rod coating. The protective layer enhances the durability, water resistance and heat sealing performance of the packaging paper.

[0025] Example 2

[0026] The base layer is selected as food packaging paper made of 100% wood pulp with a surface roughness of 7.03 μm and a basis weight of 57.8 gsm.

[0027] The oxygen barrier primer layer is formed by using a coating solution of polyvinyl alcohol 1799 with a solid content of 5.3%, a pH value of 8.19 and a viscosity of 125 mPa.S at a temperature of 70°C, and a coating amount of about 2.0 gsm by curtain coating. Further, a small amount of surfactant, such as fatty alcohol polyoxyethylene ether, is added to the coating solution to increase the surface tension of the coating solution and to make the coating solution spread evenly on the paper.

[0028] The oxygen barrier top coating layer is formed by using a coating solution of ethyl acrylate with a solid content of 15.0%, a viscosity of 180-230 cps and a pH value of 7.00-9.00 at room temperature, and a coating amount of about 3.0 gsm by curtain coating. Further, a small amount of surfactant, such as fatty alcohol polyoxyethylene ether, is added to the coating solution to increase the surface tension of the coating solution and to make the coating solution spread evenly on the paper.

[0029] The protective layer is selected from polyurethane, a coating liquid with solid content of 20.0-35.0%, viscosity of 120-180 cps and PH of 7.00-9.00 is prepared, and the protective layer is formed by light bar coating at normal temperature with coating amount of about 4.0 gsm, so that the protective layer enhances the durability, waterproof property and heat sealing property of the packaging paper.

[0030] The oxygen barrier packaging paper prepared in the above examples is subjected to performance test, and the specific results are shown in Table 1.

[0031]

[0032] The oxygen barrier packaging paper prepared in the examples 1 and 2 has oxygen transmission rate of ≤1.0 cm 3 / m 2 .24h, which indicates that the oxygen barrier packaging paper prepared in the utility model has better oxygen barrier effect and is worth popularization and use.

[0033] The oxygen barrier packaging paper provided by the utility model comprises a substrate layer, an oxygen barrier bottom coating layer, an oxygen barrier surface coating layer and a protective layer, the substrate layer provides basic strength and support for the packaging paper, the oxygen barrier layer is composed of the oxygen barrier bottom coating layer and the oxygen barrier surface coating layer, the oxygen barrier bottom coating layer is a coating layer provided on a rough surface of the substrate layer, the oxygen barrier surface coating layer is a coating layer provided on the oxygen barrier bottom coating layer, and the protective layer is a third coating layer attached to the oxygen barrier layer, the protective layer on the surface enhances the durability, waterproof property and heat sealing property of the packaging paper, the packaging paper has excellent oxygen barrier property through multiple coating, the shelf life of food and medicine can be effectively prolonged, and the packaging paper adopts environment-friendly materials and meets the requirement of sustainable development.

[0034] The above is only the preferred embodiment of the utility model, and it should be noted that, for those skilled in the art, without departing from the overall concept of the utility model, some changes and improvements can be made, and these should be regarded as the protection range of the utility model.

Claims

1. An oxygen barrier wrapping paper, characterized by: The application relates to a base material layer (1), an oxygen barrier bottom coating layer (2), an oxygen barrier surface coating layer (3) and a protective layer (4) arranged on the surface of the base material layer (1) in sequence, wherein the base material layer (1) is 100% wood pulp raw paper, the oxygen barrier bottom coating layer (2) is a polyvinyl alcohol coating layer, the oxygen barrier surface coating layer (3) is an ethylene-ethyl acrylate copolymer coating layer, and the protective layer (4) is a polyurethane coating layer.

2. The oxygen barrier paper according to claim 1, wherein: The base material layer (1) is white kraft paper or food packaging paper with a grammage of 55-60 gsm and a roughness of 6.0-8.0 mu m.

3. The oxygen barrier paper of claim 1, wherein: The coating amount of the polyvinyl alcohol coating layer is 2.0-3.0 gsm.

4. The oxygen barrier paper of claim 1, wherein: The coating amount of the ethylene-ethyl acrylate copolymer coating layer is 3.0-5.0 gsm.

5. The oxygen barrier paper of claim 1, wherein: The coating amount of the polyurethane coating layer is 4.0-5.0 gsm.

6. The oxygen barrier paper according to any one of claims 1 to 5, characterized in that: The oxygen barrier bottom coating layer (2) and the oxygen barrier surface coating layer (3) are formed by curtain coating, and the protective layer (4) is formed by light bar coating.

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