KR102387807B1 - An adhesive composition, and a packing film, a food packaging bag for a microwave oven and a food packaging container for a microwave oven each having an adhesive layer made of the same - Google Patents

Abstract

The adhesive composition includes a styrenic thermoplastic elastomer, EVA and carnauba wax, and bonding strength is reduced by heat and pressure.

Description

An adhesive composition and a packaging film each having an adhesive layer made of the adhesive composition, a food packaging bag for a microwave oven, and a food packaging container for a microwave oven {An adhesive composition, and a packing film, a food packaging bag for a microwave oven and a food packaging container for a microwave oven each having an adhesive layer made of the same}

The present invention relates to a packaging film each having an adhesive composition and an adhesive layer made of the adhesive composition, a food packaging bag for a microwave oven, and a food packaging container for a microwave oven, and more particularly, an adhesive whose bonding strength is reduced by heat and pressure It relates to a food packaging bag for a microwave oven and a food packaging container for a microwave oven each having an adhesive layer made of a composition and the adhesive composition.

When a food packaging bag or a food packaging container sealed by accommodating food such as retort food or frozen food is heated in a microwave oven, the internal pressure of the bag or the container is increased by water vapor generated from the food according to the heating. Therefore, as the bag or the cover film of the container ruptures, the food not only scatters, but also contaminates the inside of the microwave oven, and there is a risk that the user may be burned.

Before heating the bag or the container in a microwave oven, the bag or the container is partially opened in advance to discharge water vapor generated from the food during the heating process to the outside. Accordingly, it is possible to prevent the envelope or the cover film of the container from being ruptured.

However, the method causes inconvenience to the user, and since the steam generated by the heating of the microwave oven is immediately discharged to the outside, the effect of heating the food by the steam in a high temperature state is low, and the surface of the food is dried The taste of food may deteriorate.

The present invention provides an adhesive composition in which bonding strength is lowered by heat and pressure generated by heating in a microwave oven.

The present invention provides a packaging film having an adhesive layer made of the adhesive composition.

The present invention provides a food packaging bag for a microwave oven that is automatically opened in response to heat and pressure generated by heating in a microwave oven.

The present invention provides a food packaging container for a microwave oven that is automatically opened in response to heat and pressure generated by heating in a microwave oven.

The adhesive composition according to the present invention includes a styrenic thermoplastic elastomer, ethylene vinyl acetate copolymer (EVA), and carnauba wax, and bonding strength may be reduced by heat and pressure.

According to one embodiment of the present invention, the strain-based thermoplastic elastomer may be any one selected from the group consisting of SBS, SIS, SEPS, SBBS and SEBS.

According to embodiments of the present invention, 100 to 300 parts by weight of the EVA and 0.2 to 3 parts by weight of the carnauba wax may be included with respect to 100 parts by weight of the styrenic thermoplastic elastomer.

The packaging film according to the present invention may include a film and an adhesive layer provided on the film and made of the adhesive composition.

According to an embodiment of the present invention, the film includes an inner film and an outer film laminated on an outer surface of the inner film, and the adhesive layer may be provided on the inner film.

According to an embodiment of the present invention, the inner film is made of linear low density polyethylene (LLDPE) or unstretched polypropylene (CPP), and the outer film is polyethylene terephthalate (PET), stretched polypropylene (OPP), nylon (nylon).

In a food packaging bag for a microwave oven according to the present invention, a sealing portion is formed by bonding a packaging film to each other at a plurality of positions, a sealed accommodation portion for accommodating food is formed in the packaging film, and a portion of the sealing portion is provided with the packaging An adhesive layer applied between the films and having lower bonding strength compared to other parts of the sealing part by heat and pressure is provided, and the adhesive layer may include a styrenic thermoplastic elastomer, EVA and carnauba wax.

According to one embodiment of the present invention, the strain-based thermoplastic elastomer may be any one selected from the group consisting of SBS, SIS, SEPS, SBBS and SEBS.

According to embodiments of the present invention, 100 to 300 parts by weight of the EVA and 0.2 to 3 parts by weight of the carnauba wax may be included with respect to 100 parts by weight of the styrenic thermoplastic elastomer.

According to embodiments of the present invention, the packaging film may include an inner film and an outer film laminated on an outer surface of the inner film, and the adhesive layer may be provided between the inner films bonded to each other.

According to one embodiment of the present invention, the inner film is made of linear low density polyethylene (LLDPE) or unstretched polypropylene (CPP), the outer film is polyethylene terephthalate (PET), stretched polypropylene (OPP), It may be made of any one of nylon (nylon).

A food packaging container for a microwave oven according to the present invention includes a container body having a flange part along an upper rim and accommodating food, and covers the container body, and is joined with the flange part to seal the inside of the container body and an adhesive layer provided to be applied between the flange portion and the packaging film on a portion of the sealing portion and the packaging film forming the sealing portion, the adhesive layer having a lower bonding strength compared to other portions of the sealing portion by heat and pressure; The adhesiveness may include a styrenic thermoplastic elastomer, EVA and carnauba wax.

According to one embodiment of the present invention, the strain-based thermoplastic elastomer may be any one selected from the group consisting of SBS, SIS, SEPS, SBBS and SEBS.

According to embodiments of the present invention, 100 to 300 parts by weight of the EVA and 0.2 to 3 parts by weight of the carnauba wax may be included with respect to 100 parts by weight of the styrenic thermoplastic elastomer.

According to an embodiment of the present invention, the sealing portion includes an inner sealing portion and an outer sealing portion formed to be spaced apart from each other by a predetermined interval along the circumference of the flange portion, and the adhesive layer is provided in a portion of the inner sealing portion, and the A vapor discharge hole may be formed in the flange portion between the inner seal and the outer seal.

The bonding strength of the adhesive composition according to the present invention is reduced by heat and pressure.

Since the packaging film according to the present invention has an adhesive layer made of the adhesive composition, it is possible to manufacture a packaging bag or a packaging container that is automatically opened by heat and pressure using the packaging film.

The food packaging bag and the food packaging container according to the present invention are provided with an adhesive layer made of the adhesive composition in a portion of the sealing portion. Therefore, when the food packaging bag and the food packaging container are put in a microwave oven and heated, the sealing part provided with the adhesive layer may be automatically opened by heat and pressure. Therefore, it is possible to prevent the food packaging bag and the food packaging container from rupturing, it is not necessary to open the food packaging bag and the food packaging container in advance, and the taste of the food can be maintained.

1 is a perspective view illustrating a packaging film according to an embodiment of the present invention.
FIG. 2 is a perspective view illustrating another example of the packaging film shown in FIG. 1 .
3 is a cross-sectional view for explaining the packaging film shown in FIG.
4 is a schematic perspective view illustrating a food packaging bag for a microwave oven according to an embodiment of the present invention.
5 is a schematic rear perspective view for explaining the food packaging bag for a microwave oven shown in FIG. 4 .
FIG. 6 is a cross-sectional view taken along line AA of FIG. 4 .
7 is a cross-sectional view taken along line AA in a state in which the adhesion increase portion shown in FIG. 4 is opened.
FIG. 8 is a cross-sectional view taken along line BB shown in FIG. 4 .
9 is a cross-sectional view taken along line BB in a state in which the adhesion increase portion shown in FIG. 4 is opened.
10 is a schematic perspective view for explaining a food packaging container for a microwave oven according to an embodiment of the present invention.
11 is a schematic plan view for explaining a food packaging container for a microwave oven shown in FIG. 10 .
12 is a cross-sectional view taken along line CC shown in FIG. 11 .
13 is a schematic plan view for explaining another example of a food packaging container for a microwave oven shown in FIG. 10 .
14 is a cross-sectional view taken along line DD shown in FIG. 13 .

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings. Since the present invention can have various changes and can have various forms, specific embodiments are illustrated in the drawings and described in detail in the text. However, this is not intended to limit the present invention to the specific disclosed form, it should be understood to include all modifications, equivalents and substitutes included in the spirit and scope of the present invention. In describing each figure, like reference numerals have been used for like elements. In the accompanying drawings, the dimensions of the structures are enlarged than the actual size for clarity of the present invention.

Terms such as first, second, etc. may be used to describe various elements, but the elements should not be limited by the terms. The above terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, a first component may be referred to as a second component, and similarly, a second component may also be referred to as a first component.

The terms used in the present application are only used to describe specific embodiments, and are not intended to limit the present invention. The singular expression includes the plural expression unless the context clearly dictates otherwise. In the present application, terms such as "comprise" or "have" are intended to designate that a feature, number, step, operation, component, part, or a combination thereof described in the specification exists, but one or more other features It is to be understood that it does not preclude the possibility of the presence or addition of numbers, steps, operations, components, parts, or combinations thereof.

Unless defined otherwise, all terms used herein, including technical and scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with the meaning in the context of the related art, and should not be interpreted in an ideal or excessively formal meaning unless explicitly defined in the present application. does not

The adhesive composition according to the present invention will be described in detail.

The adhesive composition may include a styrene-based thermoplastic elastomer, ethylene vinyl acetate (EVA), and carnauba wax.

The styrenic thermoplastic elastomer serves to increase the adhesive strength of the adhesive composition.

The styrenic thermoplastic elastomer is at least selected from the group consisting of Styrene Butadiene Styrene (SBS), Styrene Isoprene Styrene (SIS), Styrene Ethylene Propylene Styrene (SEPS), Styrene Butadiene Butylene Styrene (SBBS) and Styrene Eethylene Butadiene Styrene (SEBS). can be one The styrene-based thermoplastic elastomer may be used alone, or two or more may be used in combination. In addition, it is preferable to use SEBS or SBBS among the elastomers, but is not limited thereto.

The styrenic thermoplastic elastomer controls the adhesive strength of the adhesive composition.

The EVA functions to weaken the adhesive strength when heat and pressure are applied in the adhesive composition.

In the adhesive composition, the amount of EVA may be about 100 to 300 parts by weight, preferably about 150 to 250 parts by weight, based on 100 parts by weight of the styrenic thermoplastic elastomer. The VA (vinyl acetate) content in the EVA may be about 15 to 40% by weight.

When the content of the EVA is less than about 100 parts by weight, the adhesive strength of the adhesive composition is high, and even when heat and pressure are applied, it is difficult to lower the adhesive strength of the adhesive composition. Accordingly, the packaging film may be damaged when heated in a microwave oven due to poor openability of the adhesive portion to which the adhesive composition is applied.

When the content of the EVA exceeds about 300 parts by weight, the adhesive strength of the adhesive composition is too low to be effective. Therefore, in the course of distribution of the product packaged by the packaging film, the adhesive portion to which the adhesive composition is applied may be opened by the internal pressure of the product.

The carnauba wax functions to weaken the adhesive strength in the adhesive composition and to prevent adhesion of the adhesive composition. Specifically, when the film coated with the adhesive composition is rolled and stored in a roll form, the carnauba wax may prevent the adhesive composition from adhering to the film.

In the adhesive composition, the amount of the carnauba wax may be about 0.2 to 3 parts by weight, preferably about 0.5 to 2 parts by weight, based on 100 parts by weight of the styrenic thermoplastic elastomer. When the content of the carnauba wax is less than about 0.2 parts by weight, it is difficult to lower the adhesive strength of the adhesive composition, and the effect of preventing adhesion of the adhesive composition is insignificant. A composition may be adhered to the film. When the content of the carnauba wax exceeds about 3 parts by weight, the adhesive strength of the adhesive composition is too low to be effective, and the viscosity of the adhesive composition increases, making it difficult to coat the adhesive composition on the packaging film.

1 is a perspective view illustrating a packaging film according to an embodiment of the present invention, FIG. 2 is a perspective view illustrating another example of the packaging film illustrated in FIG. 1 , and FIG. 3 is a packaging film illustrated in FIG. 1 . It is a cross-sectional view for explaining.

1 to 3 , the packaging film 100 may include a film 110 and an adhesive layer 120 .

The film 110 includes an inner film 112 and an outer film 114 laminated on the outer surface of the inner film 112 .

The inner film 112 may be made of linear low-density polyethylene (LLDPE) or non-stretched polypropylene (CPP). The outer film 114 may be made of any one of polyethylene terephthalate (PET), stretched polypropylene (OPP), and nylon. Information such as a trademark or a product name may be printed on the outer surface of the outer film 114 .

The film 110 may be wound in the form of a roll.

The adhesive layer 120 may be provided on the film 110 . Specifically, the adhesive layer 120 may be provided on the inner film 112 .

For example, as shown in FIG. 1 , the adhesive layer 120 may be provided along the unwinding direction of the film 110 wound in a roll shape. As another example, as shown in FIG. 2 , the adhesive layer 120 may be provided along a direction perpendicular to the unwinding direction of the film 110 .

The adhesive layer 120 may include a styrenic thermoplastic elastomer, EVA, and carnauba wax. The strain-based thermoplastic elastomer may be any one selected from the group consisting of SBS, SIS, SEPS, SBBS and SEBS. The amount of EVA may be about 100 to 300 parts by weight, preferably about 150 to 250 parts by weight, based on 100 parts by weight of the styrenic thermoplastic elastomer. The VA content in the EVA may be about 15 to 40 wt%.

A detailed description of the composition of the adhesive layer 120 will be omitted because it is substantially the same as that of the adhesive composition.

Figure 4 is a schematic perspective view for explaining a food packaging bag for a microwave oven according to an embodiment of the present invention, Figure 5 is a schematic rear perspective view for explaining the food packaging bag for a microwave oven shown in Figure 4, 6 is a cross-sectional view taken along line A-A shown in FIG. 4 , FIG. 7 is a cross-sectional view taken along line A-A in a state in which the adhesion increase portion shown in FIG. 4 is opened, FIG. 8 is a cross-sectional view taken along line B-B shown in FIG. 4 , and FIG. 9 is It is a cross-sectional view taken along line B-B in a state in which the adhesion increase portion shown in FIG. 4 is opened.

4 to 9 , the food packaging bag 200 for a microwave oven forms a sealing unit 220 by bonding the packaging film 210 to each other at a plurality of positions. Therefore, it is possible to form a sealed accommodation portion for accommodating the food inside the packaging film (210).

The packaging film 210 includes an inner film 212 and an outer film 214 laminated on the outer surface of the inner film 212 .

The inner film 212 may be made of linear low-density polyethylene (LLDPE) or non-stretched polypropylene (CPP). The outer film 214 may be made of any one of polyethylene terephthalate (PET), stretched polypropylene (OPP), and nylon. Information such as a trademark or a product name may be printed on the outer surface of the outer film 214 .

The sealing part 220 may be formed at a plurality of positions of the packaging film 210 . For example, as shown in FIGS. 4 and 5 , it may be formed at both ends and the center of the rear surface. As another example, the sealing part 220 may be formed at both ends of the packaging film 210 . The sealing part 220 may be formed by bonding the packaging film 210 by a bonding method such as thermal fusion. In this case, the inner film 212 may be bonded to each other.

An adhesive layer 230 may be provided on a portion of the sealing part 220 . The adhesive layer 230 may be provided between the inner films 212 bonded to each other. In addition, the adhesive layer 230 may be provided from the inner boundary 222 to the outer boundary 224 of the sealing part 220 .

After applying the adhesive layer 230 to a portion of the inner surface of the inner film 212 to form the sealing part 220, the adhesive layer ( 230) can be formed.

The bonding strength of the adhesive layer 230 may be lower than that of other portions of the sealing unit 220 due to heat and pressure. Therefore, when heat and pressure are applied to the food packaging bag 200 for a microwave oven, the bonding strength of the portion provided with the adhesive layer 230 in the sealing unit 220 is the bonding strength of the portion without the adhesive layer 230 . strength may be lower than that.

The adhesive layer 230 may include a styrenic thermoplastic elastomer, EVA, and carnauba wax. The strain-based thermoplastic elastomer may be any one selected from the group consisting of SBS, SIS, SEPS, SBBS and SEBS. The amount of EVA may be about 100 to 300 parts by weight, preferably about 150 to 250 parts by weight, based on 100 parts by weight of the styrenic thermoplastic elastomer. The VA content in the EVA may be about 15 to 40 wt%.

A detailed description of the composition of the adhesive layer 230 will be omitted because it is substantially the same as that of the adhesive composition.

The adhesive layer 230 is formed from the first applicator 232 and the first applicator 232 whose width is narrowed from the inner boundary 222 to the outer boundary 224 of the sealing unit 220 . A second applicator 234 extending to the outer boundary 224 of the sealing part 220 and having a constant width may be included.

The inner film of the sealing unit 30 provided with the adhesive layer 230 as the width of the first applicator 232 increases at the point where the first applicator 232 and the inner boundary 222 meet. Between the pieces 212 can be easily opened. Accordingly, in a state where the heat and pressure of the accommodating part are relatively low, the water vapor of the accommodating part may be discharged to the outside.

The inner film of the sealing unit 30 provided with the adhesive layer 230 as the width of the first applicator 232 is narrower at the portion where the first applicator 232 and the inner boundary 222 meet. The space between the slabs 212 may not be easily opened. Accordingly, in a state where the heat and pressure of the accommodating part are relatively high, the water vapor of the accommodating part may be discharged to the outside.

Therefore, by adjusting the width of the first applicator 232 at the point where the first applicator 232 and the inner boundary 222 meet depending on the type of food contained in the receiving section, the food is suitable for the condition. Water vapor in the accommodating part may be discharged to the outside of the food packaging bag 200 for a microwave oven.

Meanwhile, the adhesive layer 230 may have a constant width from the inner boundary 222 to the outer boundary 224 of the sealing part 220 .

Hereinafter, the operation of the food packaging bag 200 for a microwave oven will be described.

When the food packaging bag 200 for a microwave oven in which the food is accommodated and sealed is heated using a microwave oven, the pressure of the housing unit is increased by water vapor generated from the food in the housing unit. The bonding strength of the adhesive layer 230 in the sealing part 220 is lowered compared to other parts of the sealing part 220 by the heat and pressure. Accordingly, as the bonding between the inner films 212 of the packaging film 210 is ruptured at the portion where the adhesive layer 230 is formed in the sealing unit 220 , the sealing unit 220 is automatically opened. can

Since the water vapor is discharged while the sealing part 220 is opened, the internal pressure of the receiving part does not increase any more, and it is possible to prevent the food packaging bag 200 for a microwave oven from rupturing. In addition, it is not necessary to open the food packaging bag 200 for a microwave oven before heating it in a microwave oven, and the taste of the food can be maintained.

10 is a schematic perspective view for explaining a food packaging container for a microwave oven according to an embodiment of the present invention, FIG. 11 is a schematic plan view for explaining a food packaging container for a microwave oven shown in FIG. 12 is a cross-sectional view taken along line C-C shown in FIG. 11 .

10 to 12 , the food packaging container 300 for a microwave oven may include a container body 310 , a packaging film 320 , and an adhesive layer 340 .

The container body 310 has a container shape with an open top so that food can be stored, and a flange part 312 may be provided along the upper edge.

The packaging film 320 is provided to cover the upper surface of the container body 310 . The packaging film 320 forms a sealing part 330 by bonding with the flange part 312 to seal the inside of the container body 310 .

The packaging film 320 includes an inner film 322 and an outer film 324 laminated on the outer surface of the inner film 322 .

The inner film 322 may be made of linear low density polyethylene (LLDPE) or non-stretched polypropylene (CPP). The outer film 324 may be formed of any one of polyethylene terephthalate (PET), stretched polypropylene (OPP), and nylon. Information such as a trademark or a product name may be printed on the outer surface of the outer film 324 .

The sealing part 330 may be formed between the packaging film 320 and the flange part 312 . For example, the sealing part 330 may be provided along the upper surface of the flange part 312 . The sealing part 330 may be formed by bonding the packaging film 320 to the flange part 312 by a bonding method such as thermal welding or high-frequency welding. In this case, the inner film 322 may be bonded to the upper surface of the flange portion 312 .

An adhesive layer 340 may be provided on a portion of the sealing part 330 . The adhesive layer 340 may be provided between the inner film 322 bonded to each other and the upper surface of the flange part 312 . In addition, the adhesive layer 340 may be provided from the inner boundary to the outer boundary of the sealing part 330 .

The sealing part ( The adhesive layer 340 may be formed on the 330 .

When heat and pressure are applied to the adhesive layer 340 , the bonding strength of the adhesive layer 340 may be lower than that of other portions of the sealing part 330 . Therefore, when heat and pressure are applied to the food packaging container 300 for a microwave oven, the bonding strength of the portion provided with the adhesive layer 340 in the sealing portion 330 is the same as the bonding strength of the portion without the adhesive layer 340 . strength may be lower than that.

The adhesive layer 340 may include a styrene-based thermoplastic elastomer, EVA, and carnauba wax. The strain-based thermoplastic elastomer may be any one selected from the group consisting of SBS, SIS, SEPS, SBBS and SEBS. The amount of EVA may be about 100 to 300 parts by weight, preferably about 150 to 250 parts by weight, based on 100 parts by weight of the styrenic thermoplastic elastomer. The VA content in the EVA may be about 15 to 40 wt%.

A detailed description of the composition of the adhesive layer 340 is substantially the same as that of the adhesive composition, and thus will be omitted.

The width of the adhesive layer 340 may gradually decrease from the inner boundary to the outer boundary of the sealing part 330 . Alternatively, the adhesive layer 340 may have a constant width from the inner boundary of the sealing part 330 to the outer boundary.

Between the inner film 322 of the sealing part 330 provided with the adhesive layer 340 and the flange part 312, the narrower the width of the adhesive layer 340 at the inner boundary of the sealing part 330 is. may not be easily opened.

Between the inner film 322 of the sealing part 330 provided with the adhesive layer 340 and the flange part 312, the wider the width of the adhesive layer 340 at the inner boundary of the sealing part 330 is. can be easily opened.

Therefore, by adjusting the width of the adhesive layer 340 at the inner boundary of the sealing part 330 according to the type of food contained in the container body 310, the water vapor in the accommodation part is converted into the microwave under conditions suitable for the food. It may be discharged to the outside of the food packaging container 300 for use.

Hereinafter, the operation of the food packaging container 300 for a microwave oven will be described.

When the food packaging container 300 for a microwave oven, in which the food is accommodated and sealed, is heated using a microwave oven, the internal pressure is increased by water vapor generated from the food in the container body 310 . The bonding strength of the adhesive layer 340 in the sealing part 330 is lowered compared to other parts of the sealing part 330 by the heat and pressure. Accordingly, as the bonding between the inner film 322 and the flange portion 312 of the packaging film 320 is ruptured at the portion where the adhesive layer 340 is formed in the sealing portion 330 , the sealing portion 330 is ruptured. ) can be opened automatically.

Since the water vapor is discharged as the sealing part 330 is opened, the internal pressure does not increase any more, and it is possible to prevent the food packaging container 300 for a microwave oven from rupturing. In addition, it is not necessary to open the food packaging container 300 for a microwave oven before heating it in a microwave oven, and the taste of the food can be maintained.

13 is a schematic plan view for explaining another example of a food packaging container for a microwave oven shown in FIG. 10 , and FIG. 14 is a cross-sectional view taken along line D-D shown in FIG. 13 .

13 and 14 , the sealing part 330 includes an inner sealing part 332 and an outer sealing part ( 334) may be included.

The adhesive layer 340 may be provided on a portion of the inner sealing part 332 . The adhesive layer 340 may be provided from an inner boundary to an outer boundary of the inner sealing part 332 .

A vapor discharge hole 314 may be formed in the flange part 312 between the inner sealing part 332 and the outer sealing part 334 . Water vapor of the food packaging container 300 for a microwave oven may be discharged to the outside through the vapor discharge hole 314 . In this case, the vapor discharge hole 314 may be disposed adjacent to the adhesive layer 340 .

Although the flange portion 312 has been described as having a flat shape as shown in FIG. 11 , the packaging film is spaced apart from the upper surface of the flange portion 312 at regular intervals along the circumference of the flange portion 312 . Two protrusions or two grooves to which the 320 is joined may be provided. That is, the inner sealing part 332 and the outer sealing part 334 may be formed in the protrusions or the grooves.

The description of the container body 310, the packaging film 320, the sealing part 330, and the adhesive layer 340 except for the above is the container body 310 with reference to FIGS. 10 to 12, the The description of the packaging film 320 , the sealing part 330 , and the adhesive layer 340 is substantially the same.

Hereinafter, the operation of the food packaging container 300 for a microwave oven will be described.

When the food packaging container 300 for a microwave oven, in which the food is accommodated and sealed, is heated using a microwave oven, the internal pressure is increased by water vapor generated from the food in the container body 310 . By the heat and pressure, the bonding strength of the adhesive layer 340 in the inner sealing portion 332 is lower than that of other portions of the inner sealing portion 332 . Accordingly, as the bonding between the inner film 322 and the flange portion 312 of the packaging film 320 is ruptured at the portion where the adhesive layer 340 of the inner sealing portion 332 is formed, the inner sealing portion (332) can be opened automatically. At this time, the outer sealing part 334 is not opened.

As the inner sealing part 332 is opened and the water vapor is discharged to the outside through the vapor discharge hole 314, the internal pressure of the food packaging container 300 for a microwave oven does not increase any more, and the microwave oven It is possible to prevent the packaging film 320 of the food packaging container 300 from rupturing. In addition, it is not necessary to open the packaging film 320 in advance before heating the food packaging container 300 for a microwave oven in a microwave oven, and the taste of the food can be maintained.

Hereinafter, the present invention will be described using examples, and the present invention is not limited by the following examples because it is provided as an example in order to sufficiently convey the spirit of the present invention to those skilled in the art.

Example

In Examples 1 to 9, the adhesive composition of the following composition was coated on a packaging film consisting of an outer film PET 12 μm and an inner film CPP 30 μm in a gravure coating method to a thickness of 1.0 g/m 2 .

composition SEBS (parts by weight) EVA (parts by weight) Carnauba Wax (parts by weight) Example 1 100 100 One Example 2 100 150 One Example 3 100 200 One Example 4 100 250 One Example 5 100 300 One Example 6 100 200 0.2 Example 7 100 200 0.5 Example 8 100 200 2 Example 9 100 200 3

comparative example

In Comparative Examples 1 to 8, the adhesive composition of the following composition was coated on a packaging film composed of an outer film PET 12 μm and an inner film CPP 30 μm in a gravure coating method to a thickness of 1.0 g/m 2 .

composition SEBS (parts by weight) EVA (parts by weight) Carnauba Wax (parts by weight) Comparative Example 1 100 30 One Comparative Example 2 100 50 One Comparative Example 3 100 75 One Comparative Example 4 100 350 One Comparative Example 5 100 400 One Comparative Example 6 100 200 0.1 Comparative Example 7 100 200 0.15 Comparative Example 8 100 200 5

For the Examples and Comparative Examples, after thermocompression bonding the packaging film at a pressure of 3 kgf for 0.5 seconds to package 130 g of steamed bread to have a sealing part, refrigerate and heat it in a microwave of 700 W, 1000 W, and then open the package. measured. The opening sound was expressed as 1 (no sound) to 5 (severe sound, about 100 db or more).

Microwave 700W 1000W note Example 1 3 (with a popping sound) 3 (with a popping sound) Good Example 2 3 (with a popping sound) 2 (no popping sound) Good Example 3 2 (no popping sound) 1 (no popping sound) Good Example 4 1 (no popping sound) 1 (no popping sound) Good Example 5 1 (no popping sound) 1 (no popping sound) Good Example 6 2 (no popping sound) 1 (no popping sound) Good Example 7 2 (no popping sound) 1 (no popping sound) Good Example 8 1 (no popping sound) 1 (no popping sound) Good Example 9 1 (no popping sound) 1 (no popping sound) Good Comparative Example 1 5 (severe popping sound) 5 (severe popping sound) not applicable Comparative Example 2 5 (severe popping sound) 5 (severe popping sound) not applicable Comparative Example 3 4 (severe popping sound) 3 (with a popping sound) not applicable Comparative Example 4 1 (no popping sound) 1 (no popping sound) not applicable Comparative Example 5 1 (no popping sound) 1 (no popping sound) not applicable Comparative Example 6 2 (no popping sound) 1 (no popping sound) not applicable Comparative Example 7 2 (no popping sound) 1 (no popping sound) not applicable Comparative Example 8 1 (no popping sound) 1 (no popping sound) not applicable

Example 1 had an opening sound, and Examples 2 to 9 showed weak or no opening sound. Accordingly, it can be seen that the sealing part is automatically opened by heating in the microwave oven.

In Comparative Examples 1 and 2, the cracking sound was severe and the packaging film was destroyed, and in Comparative Example 3, the packaging film was not destroyed, but the cracking sound was severe.

In Comparative Examples 4 and 5, there was no popping sound, but a phenomenon in which the sealing part was opened due to internal pressure was partially observed.

In Comparative Examples 6 and 7, there was no popping sound, but in the packaging film wound in a roll shape, a phenomenon in which the adhesive layer was adhered to the packaging film occurred.

In Comparative Example 8, there was no popping sound, but the sealing part opened due to internal pressure, and there was a difficulty in coating the adhesive due to an increase in the viscosity of the adhesive.

Therefore, it can be seen that Comparative Examples 1 to 8 are difficult to apply to actual products.

As described above, the food packaging bag and the food packaging container according to the present invention include an adhesive layer made of the adhesive composition in a portion of the sealing part. Accordingly, when the food packaging bag and the food packaging container are put in a microwave oven and heated, the sealing portion provided with the adhesive layer may be automatically opened by heat and pressure.

Although the above has been described with reference to the preferred embodiments of the present invention, those skilled in the art can variously modify and change the present invention without departing from the spirit and scope of the present invention as set forth in the claims below. You will understand that you can.

100: packaging film 110: film
112: inner film 114: outer film
120: adhesive layer 200: food packaging bag for microwave oven
210: packaging film 212: inner film
214: outer film 220: sealing part
222: inner boundary 224: outer boundary
230: adhesive layer 300: food packaging container for microwave oven
310: container body 312: flange portion
314: vapor discharge hole 320: packaging film
322: inner film 324: outer film
330: sealing part 332: inner sealing part
334: outer sealing part 340: adhesive layer

Claims (15)

delete delete delete delete delete delete delete delete delete delete delete A container body that accommodates food and is provided with a flange portion along the upper rim;
a packaging film covering the container body and forming a sealing part by bonding with the flange part to seal the inside of the container body; and
an adhesive layer provided to be applied between the flange portion and the packaging film on a portion of the sealing portion, the adhesive layer having lower bonding strength compared to other portions of the sealing portion by heat and pressure;
The adhesive layer is provided from the inner boundary of the sealing part to the outer boundary,
The adhesive layer gradually decreases in width from the inner boundary of the sealing part to the outer boundary,
The adhesive layer is
styrenic thermoplastic elastomer;
EVA; and
containing carnauba wax,
The sealing portion includes an inner sealing portion and an outer sealing portion formed to be spaced apart while maintaining a predetermined distance from each other along the entire circumference of the flange portion,
The adhesive layer is provided on a part of the inner sealing part,
A vapor discharge hole is formed in the flange portion between the inner sealing portion and the outer sealing portion,
The adhesive layer is a food packaging container for a microwave oven, characterized in that it is disposed in a position adjacent to the vapor discharge hole. The food packaging container for a microwave oven according to claim 12, wherein the styrene-based thermoplastic elastomer is any one selected from the group consisting of SBS, SIS, SEPS, SBBS, and SEBS. The food packaging container for a microwave oven according to claim 12, wherein the EVA is contained in an amount of 100 to 300 parts by weight, and the carnauba wax is 0.2 to 3 parts by weight, based on 100 parts by weight of the styrenic thermoplastic elastomer. delete

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