KR102739113B1 - Eco-friendly easy-cut packaging material made of single polyethylene and its manufacturing method - Google Patents

Abstract

The eco-friendly easy-cut packaging material made of a single polyethylene material according to the present invention has the effect of minimizing the side effects of not being able to cut properly or not being cut along the intended cutting path when the user applies force in the wrong direction when cutting, and has excellent sealing properties before the user cuts it, and excellent durability and stability. In addition, it has the eco-friendly advantage of being inexpensive to manufacture and easy to recycle.

Description

{Eco-friendly easy-cut packaging material made of single polyethylene and its manufacturing method}

The present invention relates to an eco-friendly easy-cut packaging material made of a single polyethylene material and a method for manufacturing the same, and more particularly, to an eco-friendly easy-cut packaging material made of a single polyethylene material and having a set cutting area and path and having a method for manufacturing the same.

Packaging materials are used to package various objects such as food and medicine, and are generally manufactured with a multilayer film structure consisting of several layers. At this time, the film material used is a material with excellent durability and processability, and for example, materials such as polyethylene terephthalate (PET), oriented polypropylene (OPP), cast polypropylene (CPP), and polyamide (PA) are used.

Such packaging materials must be easy to cut to allow the contents to be taken out, and for this purpose, technology for packaging materials having a preset tearing area and path that can be simply cut by hand, that is, Easy Cut packaging materials, has been studied and commercialized. Easy Cut packaging materials have a technology in which a groove is formed in the packaging material so that it can be cut along a preset path, or a cutting line is provided in advance so that one layer of the packaging material guides the cutting path and is cut, so that the user can easily cut the packaging material.

However, conventional packaging materials to which Easy Cut technology has been applied have shortcomings that have not been resolved or need to be further improved. Specifically, Easy Cut packaging materials have limitations in that their manufacturing method is complicated and expensive, and since their manufacturing method is complicated, the equipment costs a lot and the manufacturing time is long, so in many cases, Easy Cut technology itself is not introduced. In addition, Easy Cut packaging materials are generally thinner than other packaging materials or have lower durability at the cut portion, which may result in poor durability and sealing of the packaging material, and this may cause problems with the safety of packaged foods or medicines. In addition, Easy Cut packaging materials have a more complex multilayer structure and various types of layers than conventional packaging materials, so they are difficult to recycle and are therefore not environmentally friendly.

In particular, conventional easy-cut packaging materials have limitations in that if the user applies force in the wrong direction when cutting, the contents may spill or be damaged as a result of being cut in an unintended direction instead of the intended cutting path.

Therefore, more advanced technology is required for eco-friendly easy-cut packaging materials that do not have a complex structure, are inexpensive to manufacture, have excellent openability and durability, and are easy to cut.

Korean Patent Publication No. 10-0871590 (2008.11.26)

The purpose of the present invention is to provide an eco-friendly easy-cut packaging material made of a single polyethylene material, which can minimize the side effects of not being able to cut properly or not being cut along the intended cutting path when a user applies force in the wrong direction during cutting, and a method for manufacturing the same.

Another object of the present invention is to provide an eco-friendly easy-cut packaging material made of a single polyethylene material having excellent sealing properties until the user cuts it, and excellent durability and stability, and a method for manufacturing the same.

Another object of the present invention is to provide an eco-friendly easy-cut packaging material made of a single polyethylene material that is inexpensive to manufacture and easy to recycle, and a method for manufacturing the same.

The eco-friendly easy-cut packaging material according to the present invention includes a PE layer (100) made of polyethylene material, and the PE layer (100) has a straight cutting line (130) formed therein.

In one example of the present invention, the cutting line (130) may include a plurality of pressure grooves (131) that are formed spaced apart from each other in a straight cutting direction.

In one example of the present invention, the PE layer (100) may include a first PE layer made of linear low-density polyethylene material (LLDPE); and a second PE layer made of unidirectionally oriented polyethylene (MDOPE) material laminated on the first PE layer.

In one example of the present invention, the pressurized groove (131) of the cutting line (130) may be formed in the first PE layer (110) and the second PE layer (120) of the PE layer (100), and may gradually increase in width in the depth direction and satisfy the following equation 1.

[Formula 1]

L ₁ <L ₂

(L ₁ : top length of the pressurized groove, L ₂ : bottom length of the pressurized groove)

An eco-friendly easy-cut packaging material according to an example of the present invention can satisfy the following equation 2.

[Formula 2]

0.75 < L ₁ /L ₂ < 0.95

(L ₁ : top length of the pressurized groove, L ₂ : bottom length of the pressurized groove)

In one example of the present invention, the cutting line (130) may further include a plurality of protruding grooves (132) formed spaced apart from each other in the cutting direction.

The above protruding groove (132) may have a straight line or slit shape formed in the cutting direction, and may be formed in contact with one end of the pressure groove (131), but may be formed at the rear end of the pressure groove (131) based on the cutting direction so that when cutting, the pressure groove (131) is cut first and then cut through the protruding groove (132).

In one example of the present invention, the protruding groove (132) may be a cutting line having no substantial space volume or a slit shape having a predetermined space.

In one example of the present invention, the length (L _S ) of the protruding groove (132) may be 0.5 to 3 mm.

In one example of the present invention, the cutting line (130) may include a first cutting line (130-1), a second cutting line (130-2), and a third cutting line (130-3) that are arranged in the cutting direction but are arranged parallel to each other. The second cutting line (130-2) may be arranged between the first cutting line (130-1) and the third cutting line (130-3). The second protruding groove (132-2) of the second cutting line (130-2) may be formed parallel to the cutting direction. The first protruding groove (132-1) of the first cutting line (130-1) and the first protruding groove (132-3) of the third cutting line (130-3) can be formed in a direction inclined at a predetermined angle toward the second protruding groove (132-2) of the second cutting line (130-2).

In one example of the present invention, the angle (r ₁ ) of the first protruding groove (132-1) of the first cutting line (130-1) and the second protruding groove (132-2) of the second cutting line (130-2) may be formed at 3 to 30 degrees. The angle (r ₂ ) of the third protruding groove (132-3) of the third cutting line (130-3) and the second protruding groove (132-2) of the second cutting line (130-2) may be formed at -3 to -30 degrees.

In one example of the present invention, the pressurizing groove (131) of the cutting line (130) may include a tapered pressurizing groove (131a) and a slit pressurizing groove (131b). The tapered pressurizing groove (131a) may have a triangular shape, and may be formed such that one corner of the triangle faces the cutting direction. The slit pressurizing groove (131b) may have a slit shape, and may be formed such that the end of the slit faces the cutting direction.

In one example of the present invention, the tapered pressurizing groove (131a) and the slit-shaped pressurizing groove (131b) can be spaced apart and alternately arranged in the cutting direction.

In one example of the present invention, the ratio of the thickness of the PE layer (100) and the depth (D) of the pressurizing groove (131) may be 20:2 to 15.

In one example of the present invention, the pressurized groove (131) of the cut line (130) may be formed by overlapping the first PE layer (110) and the second PE layer (120) by physical compression.

In one example of the present invention, the first PE layer (110) may be made of a polyethylene material, and the second PE layer (120) may be made of a polyvinyl alcohol material.

In one example of the present invention, the PE layer (100) satisfies the following equations 3 and 4, and the MD direction of the PE layer (100) can match the cutting direction of the cutting line.

[Formula 3]

0.1 < T _TD /T _MD < 0.3

In the above equation 3, T _TD is the tensile strength in the TD direction according to the GB/T1040.3-2006 test method, and T _MD is the tensile strength in the MD direction according to the GB/T1040.3-2006 test method.

[Formula 4]

2 < E _TD /E _MD < 5

In the above equation 4, E _TD is the elongation in the TD direction according to the GB/T1040.3-2006 test method, and E _MD is the elongation in the MD direction according to the GB/T1040.3-2006 test method.

The method for manufacturing an eco-friendly easy-cut packaging material according to the present invention includes a transport step of supplying the PE layer (100) in which the first PE layer (110) and the second PE layer (120) are laminated between a film supply roll (10) and a pressing roller (20), and a pressing step of forming a cutting line (130) including a plurality of pressing grooves (131) spaced apart from each other in the transport direction by pressing the PE layer (100) between the outer surface of the film supply roll (10) and the outer surface of the pressing roller (20). In the pressing step, a plurality of the pressing grooves (131) may be formed spaced apart from each other, but may be formed to overlap each of the first PE layer (110) and the second PE layer (120) of the PE layer (100).

In one example of the present invention, the outer surface of the pressing roller (20) may be formed with a first protruding pattern portion (21) that allows the pressing groove (131) to be formed on the PE layer (100), and the outer surface of the film supply roll (10) may have a radius of curvature of 3 to 50 cm. In the pressing step, the first protruding pattern portion (21) of the pressing roller (20) and the pressing surface of the PE layer (100) may come into contact during pressing, and the other surface may be in close contact with the outer surface of the film supply roll (10).

In one example of the present invention, the cutting line (130) may further include a plurality of protruding grooves (132) that are formed spaced apart from each other in the transport direction or the reverse direction thereof. The protruding grooves (132) may have a straight line or a slit shape formed in the transport direction or the reverse direction thereof, and may be formed at the end of the pressurizing grooves (131) in the transport direction or the reverse direction thereof.

In one example of the present invention, the outer surface of the pressing roller (20) may further include a second protruding pattern portion that allows the protruding groove (132) to be formed on the PE layer (100).

The eco-friendly easy-cut packaging material made of a single polyethylene material according to the present invention has the effect of minimizing the side effect of not being able to cut properly or not cutting along the intended cutting path when the user applies force in the wrong direction during cutting.

The eco-friendly easy-cut packaging material made of a single polyethylene material according to the present invention has excellent sealing properties until the user cuts it, and has excellent durability and stability.

The eco-friendly easy-cut packaging material made of a single polyethylene material according to the present invention and the manufacturing method thereof have an eco-friendly effect of low manufacturing cost and easy recycling.

Figure 1 is a cross-sectional view of a PE layer (100) of an eco-friendly easy-cut packaging material according to the present invention, which is a cross-sectional view taken along the center of a cutting line (130) in the cutting direction.
FIG. 2 is a schematic diagram showing a manufacturing process and manufacturing device for an eco-friendly easy-cut packaging material according to the present invention, and is a diagram showing the formation of a cutting line (130) on a PE layer (100) through a physical compression process.
FIG. 3 and FIG. 4 are drawings showing one form of a cutting line (130) formed on a PE layer (100) of an eco-friendly easy-cut packaging material according to the present invention, and are drawings showing the upper surface of the PE layer (100) on which the cutting line (130) is formed.
FIG. 5 is a drawing showing a first protruding pattern portion (21) and a second protruding pattern portion (22) by enlarging a portion of the outer surface of a pressing roller (20) used in manufacturing an eco-friendly easy-cut packaging material according to the present invention.
FIG. 6 and FIG. 7 are drawings showing examples of specific shapes of press grooves (131) among the types of cutting lines (130) formed on the PE layer (100) of the eco-friendly easy-cut packaging material according to the present invention, and are drawings showing the upper surface of the PE layer (100) on which the cutting lines (130) are formed.
FIG. 8 is a drawing showing an example of a plurality of cutting lines (130-1, 130-2, 130-3) arranged parallel to each other among one type of cutting lines (130) formed on a PE layer (100) of an eco-friendly easy-cut packaging material according to the present invention, and is a drawing showing the upper surface of a PE layer (100) on which cutting lines (130) are formed.
FIG. 9 is a drawing showing one side of the PE layer (100) of the eco-friendly easy-cut packaging material according to the present invention, and is a drawing showing the MD and TD directions according to the transport direction when forming a cutting line (130) in the manufacturing process of the packaging material.

Referring to the attached drawings below, an eco-friendly easy-cut packaging material made of a single polyethylene material and a method for manufacturing the same according to the present invention are described in detail.

The drawings described in this specification are provided as examples so that those skilled in the art can sufficiently convey the idea of the present invention. Therefore, the present invention is not limited to the drawings presented and may be embodied in other forms, and the drawings may be exaggerated to clearly illustrate the idea of the present invention.

Unless otherwise defined, technical and scientific terms used in this specification have the meaning commonly understood by a person of ordinary skill in the art to which this invention belongs, and descriptions of well-known functions and configurations that may unnecessarily obscure the gist of the present invention are omitted in the following description and accompanying drawings.

In some cases in this specification, well-known structures and devices may be omitted or illustrated in block diagram form focusing on the core functions of each structure and device to avoid obscuring the concept of the present invention.

The term “includes” as used herein is an open-ended description that has the equivalent meaning of expressions such as “comprises,” “contains,” “has,” and “is characterized by,” and does not exclude additional elements, materials, or processes not listed.

As used herein, the singular forms of terms are to be construed to include the plural forms as well, unless otherwise specified.

When a component such as a ‘membrane’, ‘film’, ‘layer’, or ‘area’ mentioned in this specification is said to be on or above another component, it includes not only a case where it is directly above and in contact with another component, but also a case where another component is interposed in between.

The term “layer” as used herein means that each material forms a continuum and has a relatively small dimension in thickness relative to its width and length. Accordingly, the term “layer” as used herein should not be interpreted as a two-dimensional flat plane.

The term “line” as used herein means that each material forms a continuum and has dimensions in which the width and height are relatively small compared to the length.

The numerical range used in this specification includes the lower and upper limits and all values within that range, the increments logically derived from the shape and width of the defined range, all doubly defined values, and all possible combinations of the upper and lower limits of the numerical range defined in different shapes. In addition, unless otherwise specifically defined in the specification of the present invention, values outside the numerical range that may occur due to experimental error or rounding of values are also included in the defined numerical range.

The unit of ‘%’ used in this specification without special mention means ‘weight%’ unless otherwise defined.

The eco-friendly easy-cut packaging material according to the present invention includes a PE layer (100) having a cutting line (130) formed therein, which includes a plurality of pressurized grooves (131) that are spaced apart from each other in a straight cutting direction, and is characterized in that the PE layer (100) is made of a single material of polyethylene.

The above PE layer (100) supports the packaging material, protects the contents, and protects against external foreign substances, and prevents the contents from being discharged to the outside. In particular, since the PE layer (100) is made of a single polyethylene material, it provides easy cutability at the time of initiation of cutting by tearing. In addition, the PE layer (100) can have properties such as securing fracture strength, heat/cold resistance, and gas barrier properties.

As a preferred example, when the PE layer (100) is a film having a laminated structure including a first PE layer made of linear low-density polyethylene (LLDPE) material; and a second PE layer made of unidirectionally oriented polyethylene (MDOPE) material laminated on the first PE layer; there is an effect that the packaging material is elongated without tearing at the moment of cutting, thereby greatly reducing the problem of requiring a lot of force for cutting.

Specifically, the first PE layer (110) and the second PE layer (110) are films made of polyethylene material, and it is preferable that the PE layer (100) is a film made of linear low density polyethylene (LLDPE), and the second PE layer is a film made of mono directional oriented polyethylene (MDOPE). Here, the weight average molecular weight of the first PE layer (110) or the second PE layer (110) can be adjusted to have the composition characteristics described in the present invention, and can be, for example, 10,000 to 500,000 g/mol.

The pressurized groove (131) of the above-mentioned cutting line (130) is formed in the PE layer (100), specifically, it is formed in the first PE layer (110) and the second PE layer (120), and has a shape that gradually increases in width in the depth direction by satisfying the following equation 1.

[Formula 1]

L ₁ <L ₂

(L ₁ : top length of the pressurized groove, L ₂ : bottom length of the pressurized groove)

In detail, as illustrated in FIG. 1, when the cutting line (130) formed on the PE layer (100) satisfies the above formula 1 and has a shape in which the width gradually increases in the depth direction, the cutting surface is formed cleanly and smoothly when cutting by guiding the cutting line, and not only is it easy to cut, but also has excellent sealing properties, durability, and stability even before cutting.

More preferably, the eco-friendly easy-cut packaging material can satisfy the following equation 2.

[Formula 2]

0.75 < L ₁ /L ₂ < 0.95

(L ₁ : top length of the pressurized groove, L ₂ : bottom length of the pressurized groove)

In this way, when the uppermost length of the pressurized groove (L ₁ )/lowestmost length of the pressurized groove (L ₂ ) is 0.75 to 0.95, the aforementioned effect can be maximized.

In order to form the cutting line (130) satisfying the above formula 1 or 2, as illustrated in FIG. 2, a process of supplying the PE layer (100) between the film supply roll (10) and the pressing roller (20) and pressing and pressing can be utilized. A raised patterned protrusion capable of forming a pressing groove (131) is formed on the outer surface of the pressing roller (20), and since the PE layer (100) is pressed and pressed in a bent state in the pressing step, the stress applied to the film by the pressing and pressing can be reduced compared to when the PE layer (100) is pressed and pressed in a flat state. Accordingly, it is possible to provide a packaging material including a PE layer (100) having excellent sealing properties, durability, and stability, while guiding the cutting line (130) of the PE layer (100) so that the cutting surface is formed cleanly and smoothly when cutting and can be easily cut.

More specifically, the method for manufacturing an eco-friendly easy-cut packaging material according to the present invention may include a transport step of supplying the PE layer (100) between a film supply roll (10) and a pressing roller (20), and a pressing step of forming a cutting line (130) including a plurality of press grooves (131) spaced apart from each other in the transport direction by pressing the PE layer (100) between the outer surface of the film supply roll (10) and the outer surface of the pressing roller (20).

Referring to the left image of Fig. 5, the outer surface of the pressing roller (20) may be formed with a first protruding pattern portion (21) that allows the pressing groove (131) to be formed on the PE layer (100). In the pressing step, the first protruding pattern portion (21) of the pressing roller (20) and the pressing surface of the PE layer (100) come into contact during pressing, and the other surface is in close contact with the outer surface of the film supply roll (10), thereby forming the pressing groove (131) on the PE layer (100).

As a preferred example, the outer surface of the film supply roll (10) has a radius of curvature that satisfies the above formula 1, or more preferably, the above formula 2, and for example, it may be preferred that the radius of curvature be 3 to 50 cm. If this is satisfied, it is easy to control so as to satisfy the above formula 2, and thus the above-described effect can be well implemented.

In the above pressing step, a plurality of the pressurizing grooves (131) are formed spaced apart from each other in the PE layer (100). When the PE layer (100) has a laminated structure of the first PE layer (110) and the second PE layer (120), the pressurizing grooves (131) are formed overlapping the first PE layer (110) and the second PE layer (120), respectively. In this way, in the eco-friendly easy-cut packaging material according to one example of the present invention, a cutting line (130) including the pressurizing grooves (131) is formed by physical pressing in the PE layer (100) including the second PE layer (120) laminated on the first PE layer (110), so that the pressurizing grooves (131) are formed overlapping the first PE layer (110) and the second PE layer (120), respectively. Accordingly, compared to the case where the pressure groove (131) is formed only on the first PE layer (110) by physical pressing and then the second PE layer (120) is laminated and manufactured, the cutting surface is formed cleaner and smoother when cutting, and it has the effect of being easier to cut.

It may be preferable that the ratio of the thickness of the above PE layer (100) and the depth (D) of the above pressurized groove (131) be 20:2 to 15. When this is satisfied, a packaging material that can be easily cut as described above and has excellent sealing properties, durability, and stability can be provided.

As a preferred example, as shown in FIGS. 3 and 4, the cutting line (130) may further include a plurality of protruding grooves (132) that are formed spaced apart from each other in the cutting direction. When this is satisfied, excellent sealing, durability, and stability can be secured, while the cut surface is formed cleanly and smoothly when cutting, and the effect of easy cutting can be maximized. In general, when the area size and depth of the pressurizing groove (131) are increased to make cutting easy, the problem of a rapid decrease in durability before cutting may occur. However, when a protruding groove (132) smaller than the pressurizing groove (131) is formed as shown in FIG. 3, the above problem can be minimized.

Specifically, as shown in FIGS. 3 and 4, the protruding groove (132) is formed in contact with one end of the pressure groove (131), but may be formed at the rear end of the pressure groove (131) based on the cutting direction so that, when cutting, the pressure groove (131) is cut first and then cut through the protruding groove (132).

As a preferred example, the protruding groove (132) may have a straight line or a slit shape formed in the cutting direction. In the case of a straight line shape, it may mean a cutting line without a substantial space volume, and for example, it may mean a state in which an inner region of the PE layer corresponding to the protruding groove is cut by a blade or the like, and the opposing inner walls of this region are not physically/chemically attached to each other but are in contact. In the case of a slit shape, it may mean a long rectangular shape having a predetermined space.

In a preferred example, the ratio of the length (L ₂ ) of the pressurizing groove (131) and the length of the protruding groove (132) based on the cutting direction may be preferably 10:1 to 8 in order to further minimize the problem. Referring to FIG. 7, the length (L _S ) of the protruding groove (132) may be defined, and as a specific example, the length (L _S ) of the protruding groove (132) may be 0.5 to 3 mm. In addition, in a preferred example, the ratio of the width (W) of the pressurizing groove (131) and the width of the protruding groove (132) based on the direction perpendicular to the cutting direction may be 100:0 to 30, and the volume ratio or area ratio of the pressurizing groove (131) and the protruding groove (132) may be 100:0 to 30. Here, the case of 100:0 means that the protruding groove (132) is a cutting line with no actual space volume.

In order to form such a protruding groove (132), a pressing roller (20) having a relief pattern formed on the outer surface thereof, which can form the protruding groove (132), is used. Specifically, the outer surface of the pressing roller (20) may further include a second protruding pattern portion that allows the protruding groove (132) to be formed on the PE layer (100). Therefore, in the pressing step, grooves of a negative pattern including the pressing groove (131) and the protruding groove (132) are formed spaced apart from each other on the PE layer (100) by pressing and pressing. At this time, the position of the protruding groove (132) with respect to the pressing groove (131) can be in either the transport direction or the reverse direction thereof. That is, the protruding groove (132) can be formed at the end of the pressing groove (131) in either the transport direction or the reverse direction thereof.

The above-mentioned pressurizing groove (131) may have a variety of area shapes when viewed from the surface of the PE layer (100), but may be tapered or slit-shaped, as illustrated in FIG. 6. That is, as a preferred example, the pressurizing groove (131) of the cutting line (130) may include a tapered pressurizing groove (131a) and/or a slit-shaped pressurizing groove (131b). The tapered pressurizing groove (131a) may have a tapered shape, for example, a triangular shape, and may be formed such that one corner of the triangle faces the cutting direction. The slit-shaped pressurizing groove (131b) may have a slit shape, and may be formed such that the end of the slit faces the cutting direction. More preferably, the tapered pressurizing groove (131a) and the slit-shaped pressurizing groove (131b) may be spaced apart and alternately arranged in the cutting direction. If this is satisfied, it has the effect of minimizing the side effect of the cutting itself not being done well or not being cut along the intended cutting path when the user applies force in the wrong direction during cutting.

Referring to FIG. 7, the length (L _T , L _R ) and width (W _T , W _R ) of the pressurizing groove (131) and the gap distance (D _S ) between the grooves can be defined. As a specific example, the length (L _T , L _R ) and width (W _T , W _R ) of the pressurizing groove (131) can be 0.5 to 2.5 mm and 0.1 to 1 mm, and the gap distance (D _S ) between the grooves can be 0.2 to 3 mm.

As a preferred example, referring to FIG. 8, the cutting line (130) may include a first cutting line (130-1), a second cutting line (130-2), and a third cutting line (130-3) that are arranged in the cutting direction but are arranged parallel to each other. At this time, the second cutting line (130-2) may be arranged between the first cutting line (130-1) and the third cutting line (130-3), and the second protruding groove (132-2) of the second cutting line (130-2) may be formed parallel to the cutting direction. The first protruding groove (132-1) of the first cutting line (130-1) and the first protruding groove (132-3) of the third cutting line (130-3) may be formed in a direction inclined at a predetermined angle toward the second protruding groove (132-2) of the second cutting line (130-2). If this is satisfied, it is possible to better guide cutting within the cutting line area range during cutting, thereby preventing the problem of the contents being unintentionally spilled due to cutting toward the center where the contents are loaded.

More preferably, referring to FIG. 8, the angle (r ₁ ) of the first protruding groove (132-1) of the first cutting line (130-1) and the second protruding groove (132-2) of the second cutting line (130-2) may be formed at 3 to 30 degrees. The angle (r ₂ ) of the third protruding groove (132-3) of the third cutting line (130-3) and the second protruding groove (132-2) of the second cutting line (130-2) may be formed at -3 to -30 degrees. When this is satisfied, even if the user cuts with the direction of force misaligned, the cutting direction can be induced to be guided to the cut surface of the cutting line (130), so that the cutting path can be formed in a straight line.

The average thickness of the above PE layer (100) can be appropriately adjusted according to the required purpose of the packaging material, such as sealing, durability, and stability, and can be, for example, 10 to 200 ㎛. In addition, the ratio of the average thicknesses of the first PE layer (110) and the second PE layer (120) of the above PE layer (100) can be 10:3 to 30.

In general, polymer films are manufactured into thin films by mechanically stretching polymer master batches during the manufacturing process. The direction in which the film is mechanically stretched is called the MD direction, and the direction perpendicular thereto is called the TD direction. Accordingly, the elongation and tensile strength in each direction vary depending on the manufacturing method of the polymer film, so it has very different physical properties depending on the direction.

Preferably, referring to FIG. 8, in the packaging material according to the present invention, the MD direction of the PE layer (100) (both the first PE layer and the second PE layer) and the cutting direction are aligned so that the ratio of the MD (Machine direction) direction elongation (tensile strength) and the TD (Transverse direction) direction elongation (tensile strength) satisfies a specific range, so that the cutting surface state is formed cleanly and smoothly without distortion when cutting, the user's force required for cutting can be minimized, and the cutting direction is guided to the cut surface, so that the effect of forming the cutting path in a straight line can be further improved.

That is, it may be desirable for the MD direction of the PE layer (100) to coincide with the cutting direction of the cutting line.

In particular, when the PE layer (100) satisfies Equation 3 and Equation 4 below and the MD direction of the PE layer (100) matches the cutting direction of the cutting line, the effect can be maximized.

[Formula 3]

0.1 < T _TD /T _MD < 0.3

In the above equation 3, T _TD is the tensile strength in the TD direction according to the GB/T1040.3-2006 test method, and T _MD is the tensile strength in the MD direction according to the GB/T1040.3-2006 test method.

[Formula 4]

2 < E _TD /E _MD < 5

In the above equation 4, E _TD is the elongation in the TD direction according to the GB/T1040.3-2006 test method, and E _MD is the elongation in the MD direction according to the GB/T1040.3-2006 test method.

Packaging material according to one example of the present invention may further include a printing layer laminated on one side of the PE layer (100), specifically, on the lower side of the first PE layer (110), the upper side of the second PE layer (120), or between the first PE layer (110) and the second PE layer (120), in order to effectively express the image of the product and the company by implementing an attractive appearance or for the purpose of providing information. This printing layer may be formed by printing an ink composition on a polymer film using a roll-to-roll gravure printing process. The specific composition and composition ratio of the ink composition are widely known in the field of packaging material manufacturing technology, and as a specific example, the ink composition may include a pigment, a binder resin, and a solvent. At this time, the ink composition may include 5 to 30 wt% of the pigment, 10 to 40 wt% of the binder resin, and 30 to 70 wt% of the solvent as a composition ratio. The pigment may be appropriately selected and used from various types of pigments known in the art so as to implement the required color, and may include at least one selected from among inorganic pigments including one or more selected from oxides, hydroxides, sulfides, ferrocyanides, chromates, silicates, sulfates, carbonates, phosphates, carbon compounds, etc.; and organic pigments including one or more selected from azo pigments, phthalocyanine pigments, nitroso pigments, alizarin pigments, aniline pigments, and condensed polycyclic pigments. The binder resin may include at least one selected from among polyurethane (PU) resins and polyvinyl butyral (PVB) resins. The solvent may include at least one selected from among alcohols such as ethanol and methyl acetate. In addition, the ink composition may further include various additives, and may include them at, for example, 0.1 to 5 wt%. Among the types of the above additives, at least one selected from among a printability improving agent, a storage stability improving agent, a processability improving agent, a viscosity controlling agent, a drying controlling agent, an oxidizing agent, an anti-foaming agent, a plasticizer, a light stabilizer, an anti-friction agent, an anti-staining agent, an anti-scratch agent, a dispersing agent, a film reinforcing agent, an anti-blocking agent, an antistatic agent, an adhesion reinforcing agent, a heat-resistant reinforcing agent, and a transferability improving agent may be used.

The eco-friendly easy-cut packaging material according to the present invention can be manufactured and used in a structure in which one or more PE layers (100) are bonded to each other to have an internal space. As a specific example, after folding the PE layer (100), the edges can be manufactured and used as a packaging material having an internal space by using a lamination process such as an adhesive application process or a heat bonding process. Alternatively, the two PE layers (100) can be bonded (so that the second PE layer faces outward) through the above process, etc. to manufacture and use a packaging material having an internal space. In this case, when the PE layer (100) has a structure in which the first PE layer and the second PE layer are laminated, the packaging material can be manufactured and used as a packaging material having an internal space by having the first PE layer face inward and the second PE layer face outward.

The adhesive used in the above laminate bonding may be formed and present on one side of the film in the form of a solid film, and various types may be used as long as the film can be bonded and combined. For example, a polyurethane adhesive may be used. As a specific example, the adhesive may include a solvent-free urethane-based polyester, and a hardener may be included in an amount of 60 to 65 parts by weight based on 100 parts by weight of the polyester. The hardener may be an isocyanate-based compound. Since the method for manufacturing packaging materials using such a laminate process is widely known in the field of packaging material manufacturing, it is permissible to refer to known documents in this field for more specific details.

The eco-friendly easy-cut packaging material according to the present invention can be used for various purposes, and specifically, can be used as a packaging material made of film material, for example, a packaging material for food, medicine, parts, materials, etc.

Hereinafter, the present invention will be described in detail through examples. However, these examples are provided to explain the present invention in more detail, and the scope of the present invention is not limited by the following examples.

A film of PE layer (100) with a width of about 1 m made of LLDPE material was prepared. The film is a film with a thickness of 30 ㎛, with a tensile strength in the MD direction of 20 MPa, a tensile strength in the TD direction of 23 MPa, an elongation in the MD direction of 581%, and an elongation in the TD direction of 973%, according to the GB/T1040.3-2006 test method.

The film (100) was fed into a roll-to-roll process device as illustrated in Fig. 2, and a cutting line was formed on one side of the film (100). Specifically, the process device includes a film supply roll (10) and a pressing roller (20), and the film (100) is transported through the film supply roll (10), and the transported film (100) is pressed while passing between the film supply roll (10) and the pressing roller (20). At this time, as shown in the left image of Fig. 5, a pressing roller (20) having a plurality of first protruding pattern portions (21) spaced apart and repeatedly formed in a single row on the outer surface was used, and during the pressing process, the first protruding pattern portions (21) formed on the outer surface of the pressing roller (20) simultaneously press the first PE layer (110) and the second PE layer (120) of the film (100), so that a pressing groove (131) is formed overlapping the first PE layer (110) and the second PE layer (120). In addition, the ratio of the thickness of the film (100) and the depth of the pressing groove (131) was 2:1.

The film (100) manufactured in this manner satisfies Equations 1 and 2 (L ₁ /L ₂ = 0.88) as shown in Table 1 below, and has a structure as shown in Fig. 1 and a single row of cutting lines (130) having a pressure groove (131) having a slit shape on the upper surface, and a packaging material including the film (100) was manufactured. At this time, the specific structural specifications are shown in Table 1 below.

In Example 1, a packaging material including a laminated film (100) having a cutting line (130) formed thereon was manufactured in the same manner as in Example 1, except that a laminated film (100) made of LLDPE material was used instead; a PE layer (100) having a width of about 1 m in which a second PE layer (120) made of MDOPE material is laminated and thermo-compression-laminated on a first PE layer (110) made of LLDPE material was used. The specific structural specifications at this time are shown in Table 1 below.

The above laminated film is a single PE material laminated film having a thickness of 60 ㎛, having a tensile strength in the MD direction of 22 MPa, a tensile strength in the TD direction of 25 MPa, an elongation in the MD direction of 681%, and an elongation in the TD direction of 1,062%, based on the GB/T1040.3-2006 test method.

In Example 2, a packaging material including a laminated film (100) having a cutting line (130) formed was manufactured in the same manner as in Example 2, except that a pressing roller (20) was used in which a plurality of second protruding pattern portions (22) were formed in a single row on the outer surface by spacing them out as shown in the right image of Fig. 5. At this time, the specific structural specifications are shown in Table 1 below.

In this way, the cutting line (130) of the laminated film (100) of the packaging material manufactured in Example 3 had a pressure groove (131) and a protruding groove (132) in a slit shape on the upper surface as shown in FIG. 3, and the ratio of the thickness of the laminated film to the depth of the protruding groove (131) was 2:1.

A packaging material including a laminated film (100) having a cutting line (130) formed was manufactured in the same manner as in Example 3, except that a pressing roller (20) was used in which the first protruding pattern portion (21) and the second protruding pattern portion (22) were formed in three rows instead of one row. The specific structural specifications at this time are shown in Table 1 below.

At this time, the cutting line (130) of the laminated film (100) of the packaging material manufactured in Example 4 was composed of three rows in which the first cutting line (130-1), the second cutting line (130-2), and the third cutting line (130-3) were spaced apart and parallel, as shown in Fig. 8. However, in a difference from Fig. 8, the first to third protruding grooves (132-1, 132-2, 132-3) were all formed in a direction parallel to the cutting direction.

In Example 4, a packaging material including a laminated film (100) having a cutting line (130) formed thereon was manufactured in the same manner as in Example 4, except that the first protruding groove (132-1) and the third protruding groove (132-3) used a pressing roller (20) with different directions of the second protruding pattern portion so that the angles with respect to the second protruding groove (132-2) were 20 degrees and -20 degrees, respectively. The specific structural specifications at this time are shown in Table 1 below.

In Example 5, a packaging material including a laminated film (100) having a cutting line (130) formed was manufactured in the same manner as in Example 5, except that the pressure groove (131) was changed to a structure in which tapered pressure grooves (131a) and slit pressure grooves (131b) were alternately spaced apart from each other in the cutting direction, as shown in FIG. 6. At this time, the specific structural specifications of the pressure grooves are shown in Table 1 below.

A packaging material including a laminated film (100) having a cutting line (130) formed thereon was manufactured in the same manner as in Example 6, except that the laminated film (100) of the following specifications was changed in Example 6.

The above-mentioned modified laminated film (100) is a film having a thickness of 60 ㎛, having a tensile strength in the MD direction of 136 MPa, a tensile strength in the TD direction of 24 MPa, an elongation in the MD direction of 90%, and an elongation in the TD direction of 220%, based on the GB/T1040.3-2006 test method.

[Comparative Example 1]

In Example 2, when forming a cut line (130) using a device, a packaging material including a laminated film (100) having a cut line (130) formed was manufactured in the same manner as in Example 2, except that the laminated film (100) was pressed with a pressing roller (20) while being placed on a flat surface so that the cut line (130) did not satisfy Equations 1 and 2.

In this way, the L ₁ /L ₂ of the laminated film (100) of the packaging material manufactured in Comparative Example 1 was 1, which did not satisfy Equations 1 and 2.

[Experimental Example 1] Evaluation of cutting characteristics

The cutting characteristics were tested using packaging materials including the laminated films (100) manufactured in Examples 1 to 7 and Comparative Example 1. Specifically, force was applied by hand to the end of the cutting line of the laminated film (100) to cut the packaging material, and the cutting characteristics (cut surface state, cutting path, average force applied until the cutting is complete) were tested. At this time, the initial force and the direction of the initial force applied to each packaging material were made the same, and a total of 10 tests were performed and the average was calculated so that objective result data could be obtained.

composition Example Comparative Example 1 1 2 3 4 5 6 7 Cut line pressurized home Top surface shape Slit triangle/slit Slit Size (L×W)(mm) 2×0.5 Separation distance (S) (mm) 1 L ₁ /L ₂ 0.88 1 protruding groove Top surface shape X cutting line X Size(L _S )(mm) 0.2 Number of cutting lines 1st row 3 rows 1st row First protrusion groove angle (r1) X 0 20 X Third protrusion groove angle (r2) -20 Film properties T _TD /T _MD 1.150 1.136 0.176 1.136 E _TD /E _MD 1.675 1.559 2.444 1.559 Film laminate structure 1st floor O 2nd floor (LLDPE/MDOPE) O O O O O O O Cut characteristics Cut surface condition 2 4 4 4 5 5 1 ※ 1: Very distorted, 2: Distorted, 3: Normal, 4: Clean, 5: Very clean Cut path 3 3 3 4 4 5 1 ※ 1: random direction, 2: curve, 3: straight line with an angle of 10 degrees or less to the cutting direction, 4: straight line with an angle of 5 degrees or less to the cutting direction, 5: straight line parallel to the cutting direction Average force applied 2 3 3 3 4 5 1 ※ 1: very large, 2: large, 3: normal, 4: small, 5: very small

10: Film supply roll, 20: Pressing roller
21: First protruding pattern portion, 22: Second protruding pattern portion
100: PE layer, 110: 1st PE layer, 120: 2nd PE layer
130 : Cut line
130-1: First cutting line, 130-2: Second cutting line, 130-3: Third cutting line
131: pressurizing groove, 131a: tapered pressurizing groove, 131b: slit-shaped pressurizing groove
131-1: First pressurizing groove, 131-2: Second pressurizing groove, 131-3: Third pressurizing groove
132 : Protruding groove
132-1: First protruding groove, 132-2: Second protruding groove, 132-3: Third protruding groove
L ₁ : Top length of the pressurized groove, L ₂ : Bottom length of the pressurized groove
L _T : length of triangular protruding groove, L _S : length of slit-shaped pressurizing groove, W _T : width of triangular protruding groove, W _S : width of slit-shaped pressurizing groove
L _S : Length of protruding groove
S: The distance between a pressure groove and another adjacent pressure groove

Claims (6)

As an eco-friendly easy-cut packaging material including a PE layer (100) made of polyethylene material,
The above PE layer (100) has a straight cutting line (130) formed,
The above cutting line (130) includes a plurality of pressure grooves (131) that are formed spaced apart from each other in the cutting direction along a straight line.
The above PE layer (100) is
A first PE layer made of linear low-density polyethylene (LLDPE) material; and a second PE layer made of unidirectionally oriented polyethylene (MDOPE) material laminated on the first PE layer;
The pressure groove (131) of the above-mentioned cutting line (130) is
It is formed on the first PE layer (110) and the second PE layer (120) of the above PE layer (100),
An eco-friendly easy-cut packaging material that gradually increases in width in the depth direction and satisfies the following equation 1:
[Formula 1]
L ₁ <L ₂
(L ₁ : top length of the pressurized groove, L ₂ : bottom length of the pressurized groove).
delete delete In the first paragraph,
The above cutting line (130) further includes a number of protruding grooves (132) that are formed spaced apart from each other in the cutting direction.
The above protruding groove (132) is
It has a straight line or slit shape formed in the cutting direction,
An environmentally friendly easy-cut packaging material formed by contacting one end of the above-mentioned pressure groove (131), and formed at the rear end of the above-mentioned pressure groove (131) based on the cutting direction so that when cutting, the above-mentioned pressure groove (131) is cut first and then cut through the above-mentioned protruding groove (132). In paragraph 4,
The above cutting line (130) includes a first cutting line (130-1), a second cutting line (130-2), and a third cutting line (130-3) that are arranged in the cutting direction but are arranged parallel to each other.
The above second cutting line (130-2) is positioned between the above first cutting line (130-1) and the above third cutting line (130-3).
The second protruding groove (132-2) of the second cutting line (130-2) is formed parallel to the cutting direction.
An eco-friendly easy-cut packaging material in which the first protruding groove (132-1) of the first cutting line (130-1) and the first protruding groove (132-3) of the third cutting line (130-3) are formed in a direction inclined at a predetermined angle toward the second protruding groove (132-2) of the second cutting line (130-2). In the first paragraph,
The pressure groove (131) of the above-mentioned cutting line (130) includes a tapered pressure groove (131a) and a slit-shaped pressure groove (131b).
The above tapered pressure groove (131a) has a triangular shape, and one corner of the triangle is formed so that it faces the cutting direction.
An eco-friendly easy-cut packaging material in which the above slit-shaped pressurized groove (131b) has a slit shape, but the end of the slit is formed so that it faces the cutting direction.