KR20200070482A - Recyclable packaging paper - Google Patents

Abstract

According to embodiments of the present invention, provided is recyclable packaging paper for packaging an object to be packaged, including a polypropylene resin material. The recyclable packaging paper includes an adhesive film of at least one of a non-stretched polypropylene resin film, a stretched copolymer polypropylene resin film, and a stretched terpolymer polypropylene resin film; a first layer adjacent to the object to be packaged; a second layer including the stretched polypropylene-based resin film and disposed on an upper layer of the first layer; and a barrier coating layer disposed between the first layer and the second layer and including an organic material.

Description

Recyclable packaging paper {RECYCLABLE PACKAGING PAPER}

The recycled wrapping paper according to the present invention relates to an easy-to-recycled wrapping paper, and specifically, to each of the functional layers constituting the wrapping paper formed by stacking a plurality of films is formed of a similar material, and thus to an easy-to-recycled recycled paper. .

The food wrapper is stored to prevent food damage and improves the marketing of food containers, and plays an important role in food sales. Therefore, in order to maintain the freshness and preservability of food, the food wrapper must not only have excellent gas and moisture barrier properties, but also must be visually excellent. Furthermore, in the current trend of increasing interest in environmental pollution, the importance of recycling has been emphasized, and the need for a single recyclable packaging material has emerged.

In general, there are a number of products in which a multi-layer film composed of dissimilar materials including a metal material such as aluminum is stacked for wrapping oxygen in an existing food container packaging. However, multi-layer film packaging made of dissimilar materials including metal materials such as aluminum is difficult to recycle, and even if recycled, there is a problem that it is difficult to prevent the discharge of substances harmful to the environment.

In addition, the multi-layered film wrapping paper has the inconvenience of being difficult to store and attach to the target container of the wrapping paper due to being rolled up due to the different tension characteristics of the composition constituting each layer of the wrapping paper in the step of appropriately processing the appearance of each food container.

Republic of Korea Registered Utility Model Publication 20-0305978 (03.04.2003)

In order to solve the above-mentioned problems, the recycled wrapping paper according to the present invention is formed of a single material similar to a general recycled food container, and is intended to provide a recycled wrapper that can be easily recycled without having to be separately removed from the food container.

In a recycled wrapping paper for packaging a packaging object containing a polypropylene-based resin material according to embodiments of the present invention, a non-stretched polypropylene-based resin film, a stretched copolymer polypropylene resin film, and a stretched terpolymer polypropylene resin film A first layer comprising at least one of the adhesive film, adjacent to the object to be packaged; A second layer comprising a stretched polypropylene-based resin film disposed on an upper layer of the first layer; It is disposed between the first layer and the second layer, and intends to provide a recycled wrapping paper including a barrier coating layer including an organic material.

In embodiments, the object to be packaged may be made of a polypropylene-based resin, to provide a recycled wrapping paper.

In embodiments, the barrier coating layer may provide a recycled wrapping paper that is dry laminated on the first layer.

In one embodiment, the first layer, the adhesive film adjacent to the packaging object; And a stretched polypropylene-based resin film disposed on an upper layer of the adhesive film.

In embodiments, the barrier coating layer may provide a recycled wrapping paper having a thickness of greater than 0 μm and less than or equal to 5 μm.

In embodiments, it is possible to provide a recycled wrapping paper in which a recess is formed on one side of the surface to be interviewed.

In embodiments, the recessed portion is formed on the first layer, and the depth of the recessed portion is less than or equal to the thickness of the first layer.

In embodiments, the wrapping paper may be formed in a circular shape, and a plurality of recesses may be formed in a concentric circle pattern having different diameters to provide a recycled wrapping paper.

In embodiments, the thickness of the wrapping paper may be 40 μm or more and 150 μm or less, and the depth of the recess on the wrapping paper may be 15 μm or more and 60% or less of the thickness of the wrapping paper.

In embodiments, the second layer may further include a non-stretched polypropylene-based resin film disposed on the stretched polypropylene-based resin film, to provide a recycled wrapping paper.

In embodiments, the lower surface of the stretched polypropylene-based resin film may be composed of a copolymer polypropylene resin, and the upper surface may be composed of a homopolymer polypropylene resin, thereby providing a recycled wrapping paper.

In order to solve the above-mentioned problem, the recycled wrapping paper according to the present invention is formed of a single material similar to a general recycled food container, and thus can be easily recycled without having to be separately removed from the food container.

Specifically, the recycled wrapping paper according to the present invention is used for a packaging object in the form of a food container formed of a polypropylene-based resin material, and a film of a plurality of polypropylene-based resin materials is formed in a stacked structure to recycle the packaging object. In order to separate and discharge for processing, there is no need to remove the wrapping paper separately, so it is easy to recycle.

In addition, the recycled wrapping paper according to the present invention has an effect of preventing the phenomenon that the wrapping paper rolls up due to the difference in the tensile force between the films by forming a recess on one side where the film of the material having a high tensile force is disposed.

1 is a view showing a variety of conventional food container wrapping paper.
2 is a side cross-sectional view showing a recycled wrapping paper according to an embodiment of the present invention.
3 is a side cross-sectional view showing a recycled wrapping paper according to other embodiments of the present invention.
4 is a side cross-sectional view showing a conventional recycled wrapping paper and a recycled wrapping paper according to a modified embodiment of the present invention.
5 is a view showing various embodiments of a recycled wrapping paper according to a modified embodiment of the present invention.
6 is a view showing a deformable configuration of the second layer of the recycled wrapping paper according to an embodiment of the present invention.

Hereinafter, with reference to the accompanying drawings, embodiments of the present invention will be described in detail so that those skilled in the art to which the present invention pertains can easily practice. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. In addition, in order to clearly describe the present invention in the drawings, parts irrelevant to the description are omitted, and like reference numerals are assigned to similar parts throughout the specification.

Throughout the specification, when a part is "connected" to another part, this includes not only "directly connected" but also "electrically connected" with another element in between. . Also, when a part is said to "include" a certain component, this means that other components may be further included rather than excluding other components, unless otherwise stated.

Hereinafter, various embodiments of the recycled wrapping paper according to the present invention will be described with reference to the accompanying drawings.

1 is a view showing a variety of conventional food container wrapping paper.

Referring to Figure 1, a conventional food container wrapping paper is generally a plurality of films containing a film formed of a metal such as aluminum having excellent gas barrier performance to block the gas flowing into the food container to maintain the freshness of the food It was formed by lamination. This packaging paper has a problem that it is difficult to separate and recycle because various materials such as organic resins and metals are mixed.

In order to solve the above-mentioned problem, the recycling wrapping paper 1 according to an embodiment of the present invention does not include a metal film such as aluminum and is made of an organic film to provide a packaging that is easy to recycle. The recycled wrapping paper 1 according to an embodiment of the present invention may be a wrapping paper for packaging an object to be packaged, such as a food container. Here, the object to be packaged may be formed of an organic material, and preferably may be formed of a single material of polypropylene. Polypropylene is characterized by its robustness and ease of recycling.

2 is a side cross-sectional view showing a recycled wrapping paper 1 according to an embodiment of the present invention.

2, the recycled wrapping paper 1 according to an embodiment of the present invention may include a first layer 11, a second layer 12, a barrier coating layer 13, a printing layer 14.

The first layer 11 may be disposed adjacent to the object to be packaged and may be a layer including a film that is interviewed and attached to the object to be packaged. The first layer 11 is adhered to at least one of a non-stretched polypropylene (CPP) casting film, a stretched copolymer polypropylene (Copolymer OPP) resin film, and a stretched terpolymer polypropylene (Terpolymer OPP) resin film It may include a film (Adhesive Film). The non-stretched polypropylene-based resin is a polypropylene-based resin produced without going through a stretching process, and has excellent transparency and moisture resistance, high surface hardness, and excellent heat-sealing property compared to a stretched polypropylene-based film. Therefore, the non-stretched polypropylene-based resin film is disposed on the lowermost layer of the wrapping paper and is heat-treated in an interviewed state to the packaging object, and may serve to bond the packaging object to the packaging object.

The copolymer may be a polymer formed by copolymerizing two or more types of monomers, and the terpolymer may be a polymer formed by copolymerizing three or more types of monomers. Copolymer and terpolymer polypropylene resins may have higher impact strength than homopolymer polypropylene resins. In addition, copolymer and terpolymer polypropylene resins may have weaker heat resistance than homopolymer polypropylene resins. Therefore, when the lower surface of the first layer is composed of a copolymer and a terpolymer polypropylene resin, and heat is applied thereto, there is an effect that adhesion can be easily performed to the packaging object that is in contact with the lower surface of the first layer.

The second layer 12 may be a layer including a film disposed on the upper layer of the first layer 11. The second layer 12 may be directly adhered to the top surface of the first layer 11, but various functional layers may be disposed between the first layer 11 and the second layer 12. The second layer 12 may include a stretched polypropylene (OPP: Oriented Polypropylene) resin film. Stretched polypropylene-based resins are characterized by excellent transparency, moisture resistance, surface gloss, low specific gravity, and excellent mechanical strength such as tensile strength and impact strength compared to non-stretched polypropylene.

The barrier coating layer 13 is disposed between the first layer 11 and the second layer 12 and may be a layer for preventing gas permeation. The barrier coating layer 13 may be formed of an organic material. Preferably, the barrier coating layer 13 may include polypropylene (PP) resin, and may further include an inorganic material to improve moisture resistance. The barrier coating layer 13 may have a thickness of greater than 0 μm and less than or equal to 5 μm. In order to improve gas barrier properties, it is advantageous for the barrier coating layer 13 to be thick, but when the thickness exceeds 5 μm, processing is difficult and the recycling yield may be deteriorated. Therefore, while providing sufficient moisture resistance and gas barrier properties under atmospheric pressure, the thickness of the barrier coating layer 13 is preferably 5 μm or less to secure processability and recycling yield, and it is also possible to improve the gas barrier properties by adding an inorganic material.

The barrier coating layer 13 may be dry-laminated on the first layer 11. Here, the dry lamination may be a method of applying an adhesive dissolved in an organic solvent to a film, drying it in a dryer, and then attaching other substrates to join them. Specifically, since the barrier coating layer 13 according to an embodiment of the present invention is formed of an organic material, the upper surface of the first layer 11 is coated by processing it in a liquid phase and then applying it on the first layer 11 Then, the dry layer can be performed as the second layer 12 and/or the printed layer 14 are stacked on the dried barrier layer 13.

Here, the printing layer 14 may be a layer on which ink is printed. For example, the printing layer 14 may be a layer in which various colors of ink are printed on a base of a primer material. The printing layer 14 may be laminated between the second layer 12 and the barrier coating layer 13. Accordingly, since the second layer 12 is disposed on the upper surface of the printing layer 14, the printing layer 14 is blocked from the outside, thereby preventing the printed ink from being damaged.

3 is a side cross-sectional view showing a recycled wrapping paper according to other embodiments of the present invention.

Referring to FIG. 3, a barrier coating layer 23 including an organic material may be stacked on the first layer 21 made of an unstretched polypropylene-based resin film. A second layer 22 made of a stretched polypropylene-based resin film may be stacked on the top layer of the barrier coating layer 23. A print layer 24 may be stacked on the upper layer of the second layer 22 (see FIG. 3(a) ).

The first layers 31 and 41 may include an unstretched polypropylene-based resin film adjacent to the object to be packaged and a stretched propylene-based resin film disposed on the upper layer. For example, the recycled wrapping paper may have a non-stretched polypropylene-based resin film disposed on the lowermost layer, and a stretched propylene-based resin film may be laminated thereon to form the first layer 31. On the upper layer of the first layer 31, a barrier coating layer 33, a second layer 32 made of a stretched propylene-based resin film, and a printing layer 34 may be sequentially stacked from below (FIG. 3(b)) Reference).

In addition, an unstretched polypropylene-based resin film is disposed on the lowermost layer of the recycled wrapping paper, and a stretched propylene-based resin film is stacked thereon to form the first layer 41. On the upper portion of the first layer 41, a barrier coating layer 43, a printing layer 44, and a second layer 42 made of a stretched propylene-based resin film may be sequentially stacked from below (FIG. 3(c)). Reference).

4 is a cross-sectional side view showing a conventional recycled wrapping paper and a recycled wrapping paper 1 according to a modified embodiment of the present invention.

Referring to FIG. 4, in general, food wrapping paper may be manufactured by punching a large-area packaging laminated film in a size and shape suitable for a portion to be packaged. In this process, the punched wrapping paper has a structure in which films of materials having different physical properties such as tensile force are stacked, so that the film 52' of the material having low tensile force is expanded and the film 51' of the material having high tensile force is expanded. There was a problem of shrinking and curling toward the arrangement. To solve this, the recycled wrapping paper according to the modified embodiment of the present invention may include a recess 511.

The recess 511 may be a groove formed concavely on a flat surface of the wrapping paper. The recess 511 may be formed on one side of the wrapping paper that interviews the object to be packaged. One side of the wrapping paper may be one side on which a film of a material having high tensile strength is disposed. The recess 511 may be formed through a half-knife process that cuts a sheath on one side of the wrapping paper. The recess 511 is formed on the first layer 51, and the depth may be less than or equal to the thickness of the first layer 51. Thus, the recess 511 may not be formed on another film layer 52 including a barrier coating layer disposed on the upper layer of the first layer 51, and moisture-proof and gas-blocking effects of the wrapping paper may be maintained.

The thickness of the recycled wrapping paper 1 may be 40 μm or more and 150 μm or less. If the wrapping paper is too thick, there is a disadvantage in that it is difficult to process and the manufacturing cost is high. If it is too thin, the gas barrier performance is lowered and the breakage is easy. Therefore, when the thickness of the wrapping paper is used in a small disposable container having a thickness of 40 μm or more and 150 μm or less, there is an advantage that excellent gas barrier performance and durability are guaranteed and processing is easy.

The depth of the recess 511 may be 15 μm or more and 70% or less of the thickness of the recycled wrapping paper 1. For example, when the thickness of the recycled wrapping paper 1 is 40 μm, the depth of the recess 511 may be 15 μm or more and 28 μm or less. In addition, when the thickness of the recycled wrapping paper 1 is 150 μm, the depth of the recess 511 may be 15 μm or more and 105 μm or less. If the depth of the recess 511 is too deep, there is a disadvantage that durability and gas barrier performance of the wrapping paper are lowered. If the depth of the recess 511 is too shallow, an effect of preventing the wrapping paper from being rolled up due to a difference in tensile force between a plurality of films constituting the wrapping paper may be lowered. Therefore, when the depth of the recessed portion 511 is 15 μm or more and 70% or less of the thickness of the recycled wrapping paper 1, when used in a small disposable container, excellent gas barrier performance and durability of the wrapping paper are secured, and the wrapping paper It has the advantage that it can be prevented from being curled when is processed.

5 is a view showing various embodiments of a recycled wrapping paper according to a modified embodiment of the present invention.

Referring to FIG. 5, a plurality of concave grooves 511a may be formed in a concentric circle pattern having different diameters (see FIG. 5(a)). For example, the wrapping paper for sealing the open top of the cylindrical disposable coffee may be formed in a circular shape, and the recess 511a may be formed in a circular shape corresponding to the shape of the wrapping paper. Furthermore, a plurality of groove portions 511a may be formed in the form of circular lines having different diameters in a concentric circle pattern. The circular lines may be spaced apart from each other at the same distance. Thereby, there is an effect that can absorb the shrinking force and tensile force acting in all directions of the wrapping paper to prevent the wrapping paper from rolling.

Further, the recess 511b may be formed in the form of a dotted line on one side of the wrapping paper (see FIG. 5(b) ). For example, it may be formed in the form of a dotted line on a circular line having a different diameter in a concentric circle pattern on one side of the wrapping paper. Accordingly, there is an effect that can improve the durability of the wrapping paper than the groove portion 511a formed in a straight shape.

Further, the recess 511c may be formed in a lattice form on one side of the wrapping paper (see FIG. 5(c)). The groove portion 511c of this type generally has an advantage in that it is easy to cut half-knife having a straight pattern.

6 is a view showing a deformable configuration of the second layer of the recycled wrapping paper according to an embodiment of the present invention.

Referring to FIG. 6(a), the second layer 12a may further include an unstretched polypropylene-based resin film 122a disposed on an upper layer of the stretched polypropylene-based resin film 121a. Thus, the material of the film 11 disposed on the lower portion of the recycled wrapping paper and the film 122a disposed on the upper portion are matched to prevent curling of the wrapping paper caused by a difference in physical properties of the material.

6(b), the lower surface 121b of the stretched polypropylene-based resin film of the second layer 12b is composed of a copolymer polypropylene resin (Copolymer PP), and the upper surface 121a is a homopolymer. It may be composed of polypropylene resin (Homopolymer PP). Here, the homopolymer may be a polymer composed of one type of monomer, and the copolymer may be a polymer formed by copolymerizing two or more types of monomers. Copolymer polypropylene resin may have higher impact strength than homopolymer polypropylene resin. In addition, the copolymer polypropylene resin may have weaker heat resistance than the homopolymer polypropylene resin. Accordingly, when the lower surface 121a of the second layer is made of a copolymer polypropylene resin, and heat is applied thereto, the barrier coating layer 13 and/or the printing layer 14 disposed on the lower layer of the second layer 12b It is possible to easily perform the adhesion of, there is an effect that can enhance the durability of the packaging as a whole.

Recycling wrapping paper according to various embodiments of the present invention described above is used for a packaging object in the form of a food container formed of a polypropylene-based resin material, and the first and second layers composed of a film of a polypropylene-based resin material. Since this is formed in a lamination, there is no need to remove the wrapping paper separately when discharging and processing in order to recycle the packaged object, so that the recycling operation is facilitated.

In addition, the recycled wrapping paper according to various embodiments of the present invention may form a groove 511 on one side where a film of a material having high tensile strength is disposed, thereby preventing the wrapping paper from being rolled up due to a difference in tensile force between films. It has an effect.

The above description is merely illustrative of the technical idea of the present invention, and those skilled in the art to which the present invention pertains may make various modifications and variations without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are not intended to limit the technical spirit of the present invention, but to explain them, and the scope of the technical spirit of the present invention is not limited by these embodiments. The scope of protection of the present invention should be interpreted by the claims below, and all technical spirits within the scope equivalent thereto should be interpreted as being included in the scope of the present invention.

1: Recycled wrapping paper
11: 1st floor
12: second layer
13: barrier coating layer
14: printed layer
511: recess

Claims (10)

In the recycled packaging for packaging the object to be packaged containing a polypropylene-based resin material,
A first layer adjacent to the object to be packaged, including at least one adhesive film of a non-stretched polypropylene-based resin film, a stretched copolymer polypropylene resin film, and a stretched terpolymer polypropylene resin film;
A second layer comprising a stretched polypropylene-based resin film disposed on an upper layer of the first layer; And
A recycled wrapping paper disposed between the first layer and the second layer and including a barrier coating layer comprising an organic material. According to claim 1,
The barrier coating layer is dry laminated on the first layer, recycled wrapping paper. According to claim 1,
The first layer,
The adhesive film adjacent to the packaging object; And
A recycled wrapping paper comprising a stretched polypropylene-based resin film disposed on an upper layer of the adhesive film. According to claim 1,
The barrier coating layer has a thickness of more than 0μm and less than 5μm, recycled wrapping paper. According to claim 1,
Recycling wrapping paper in which grooves are formed on one side of the surface of the object to be packaged. The method of claim 5,
The recess is formed on the first layer, and the depth of the recess is less than or equal to the thickness of the first layer. The method of claim 5,
The wrapping paper is formed in a circular shape, and the concave grooves are formed in a plurality of concentric circles having different diameters. The method of claim 5,
The thickness of the wrapping paper is 40 μm or more and 150 μm or less, and the depth of the groove on the wrapping paper is 15 μm or more and 70% or less of the thickness of the wrapping paper. According to claim 1,
The second layer further comprises an unstretched polypropylene-based resin film disposed on an upper layer of the stretched polypropylene-based resin film. According to claim 1,
A recycled wrapping paper, wherein the lower surface of the stretched polypropylene-based resin film of the second layer is made of a copolymer polypropylene resin, and the upper surface is made of a homopolymer polypropylene resin.

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