Packaging container capable of adjusting the area of a receiving space using a pressure difference

Abstract

The present invention relates to a packaging container with a structurally improved structure that prevents the contents from being lost to the outside by controlling the area of ​​the receiving space through the creation of a pressure difference during the process of opening the packaging container filled with contents in the receiving space. More specifically, the invention relates to a packaging container comprising a container body having a receiving space formed therein that is in communication with an upper part that is open on the inside and filled with contents, and a sealing sheet attached to the upper part of the opened container body so as to be openable and closable and capable of sealing the receiving space. The packaging container is characterized by including a shape-variable part formed on the outer surface of the container body that increases the area of ​​the receiving space due to the pressure difference between the outside and the receiving space caused by the opening of the sealing sheet.

Description

Technology Field

[0001] The present invention relates to a packaging container with a structurally improved structure that prevents the contents from being lost to the outside by controlling the area of ​​the receiving space through the creation of a pressure difference during the process of opening a packaging container filled with contents in the receiving space. Background Technology

[0002] Today, the use of petrochemical products has become commonplace in our daily lives and is widely utilized in various fields. Among the diverse mineral synthetic resins, polypropylene and polyethylene, which are harmless to the human body, are suitable for food packaging and are primarily used as sealing containers and vinyl packaging materials, respectively.

[0003] Although plastic materials have excellent characteristics such as ease of processing and durability, they also cause reactions that pollute the global environment, such as posing a serious threat to animals and plants or disrupting ecosystems, by generating plastic waste that is not easily biodegradable.

[0004] Although the components of some plastics are harmless to the human body, they are ingested in the form of micromolecules and accumulate; furthermore, the reality is that plastic waste that is not fully recovered and recycled after use affects humans, animals, and plants alike, causing severe adverse effects on the global ecosystem.

[0005] Unless a suitable substitute for plastic emerges immediately, devising measures to reduce its usage and increasing recycling rates for the sake of the global ecosystem and the future of humanity is an immediate challenge that we must address with a sense of responsibility.

[0006] If we take the packaging methods of the chicken industry as an example of the evolution of food packaging laws, in the not-so-distant past—during the early development of the foodservice industry—the first material made of the aforementioned mineral synthetic resin used for packaging pickled radish for delivery or take-out was a regular plastic bag.

[0007] For several years thereafter, the products were packaged and delivered to consumers using plastic containers with lids, but the two aforementioned packaging methods had drawbacks in terms of durability and shelf life. Because the products were not completely sealed, consumers had no choice but to endure inconveniences such as damage causing the contents to leak out, or prolonged exposure to air leading to the influx of external contaminants or rancidity, which resulted in the food's original taste deteriorating and emitting odors.

[0008] Sealing is a packaging technique that has become popularized relatively recently for cooked foods and food ingredients.

[0009] The material of the packaging container used in the aforementioned sealing technique also falls under the category of plastic. It is a packaging method in which polyprene produced in a rolled form is inserted into the mold of a molding machine, heat and pressure are applied to produce a container, contents are loaded into the container, and then a polyethylene film is applied inside a sealing machine to weld it together with heat and pressure to seal the food.

[0010] The above packaging method satisfies processability, durability, and airtightness, and is not only applied to product packaging in large-scale production plants equipped with automated systems, but has also established itself as the most popular and widespread packaging method. With the ability to manufacture small-scale sealing machines, it is also used in some households for packaging refrigerated foods and is suitable for delivery or take-out packaging in small restaurants.

[0011] As an example of a packaging method using the aforementioned conventional sealing technique, there is a chicken radish pickle container. As shown in FIG. 8, the chicken radish pickle container takes a rectangular shape, but depending on the type or size of the contents to be packaged, it is produced in various ways with different external shapes and sizes, such as circular or polygonal shapes. However, in a specific part of the container, it takes a standardized shape structurally, and has a standardized feature without exception that a horizontal perimeter (101) is formed at the top, having a predetermined width that is extended at an approximate right angle from an upward position spaced apart from the bottom surface of the container up to a certain height and forms a horizontal line.

[0012] This is a structural measure to avoid rancidity, and is a structure designed to fill the container receiving portion with contents as much as possible up to the overflow threshold level, which is equal to the surface of the horizontal perimeter (101) at the top of the conventional container, and to cover the contents by tightly adhering the packaging film (200) to prevent bubbles from forming, thereby welding it to the surface of the horizontal portion. It is judged to be a standardized essential structure that is confirmed in all sealing containers. In response to these requirements for preventing rancidity, the condition and structure of completely filling the container up to the top resulted in almost no gap between the maximum loading height of the contents and the top of the container.

[0013] Thus, conditions and structures such that the contents are filled to a critical level so that they do not overflow to the top of the container can cause inconvenience to the end consumer. Even if the container is opened carefully while maintaining a horizontal position, the contents that are always on the back of the cover film (200) are likely to flow down due to gravity when the container is torn up and get on the hand holding the container. This results in the inconvenience of inevitably spilling a small amount of liquid onto the floor beyond the horizontal perimeter (102).

[0014] Meanwhile, to solve the above-mentioned problem, as illustrated in FIG. 9, another prior art is disclosed in Korean Patent Publication No. 10-2025-0049126, and the gist of the prior art is to form a vertical perimeter (102) that extends upward from the end of the horizontal perimeter (101) and forms a concave perimeter groove (103), thereby preventing the contents filled to a critical level inside the container from being lost during the process of separating the cover film (200) sealed on the container (100).

[0015] However, the aforementioned conventional technology presents another problem in that the manufacturing process is considerably complex and requires the use of an unnecessarily large amount of material. Prior art literature

[0016] Republic of Korea Published Patent No. 10-2025-0049126 (Publication Date: April 11, 2025) Republic of Korea Published Patent No. 10-2022-0051118 (Publication Date: April 26, 2022) Republic of Korea Published Patent No. 10-2025-0151052 (Publication Date: October 21, 2025) The problem to be solved

[0017] To solve the aforementioned conventional problems, the present invention aims to provide a packaging container in which contents are not lost simply by opening the sealing film, through structural improvements to the packaging container produced by simplifying the process and suppressing the use of unnecessary materials compared to the prior art. means of solving the problem

[0018] As a means of solving the problem of the aforementioned conventional problems, a packaging container capable of adjusting the area of ​​a receiving space using a pressure difference according to the first embodiment of the present invention comprises a container body (110) having a receiving space (111) formed therein that is open to the inside and communicates with the upper part, and a sealing sheet (120) that is attached to the upper part of the open container body (110) so as to be openable and closable and seals the receiving space (111). In the packaging container, the packaging container comprises a shape-variable part (113) formed on the outer surface of the container body (110) and which increases the area of ​​the receiving space (111) due to the pressure difference between the outside and the receiving space (111) when the sealing sheet (120) is open, wherein the shape-variable part (113) is formed such that the outer surface of the container body (110) protrudes toward the receiving space (111) when the sealing sheet (120) is closed. It is characterized by including a groove (113a).

[0019] Additionally, it is preferable that the above-mentioned groove (113a) protrudes outward from the container body (110) due to the pressure difference between the outside of the container body (110) and the receiving space (111) through the opening of the sealing sheet (120), thereby allowing the liquid level of the contents contained inside the container body (110) to be lowered.

[0020] Additionally, it is preferable that the cross-sectional thickness (T2) of the above-mentioned groove (113a) be formed to be thinner than the cross-sectional thickness (T1) of the above-mentioned container body (110) and be formed to be connected to the container body (110).

[0021] Meanwhile, as a means of solving the problem of the aforementioned conventional problems, a packaging container capable of adjusting the area of ​​a receiving space using a pressure difference according to the second embodiment of the present invention comprises a container body (110) having a receiving space (111) formed therein that is open to the inside and is connected to the upper part of the container body (110) and filled with contents, and a sealing sheet (120) attached to the upper part of the open container body (110) so as to be openable and closable and capable of sealing the receiving space (111). The packaging container comprises a shape-variable part (113) formed on the outer surface of the container body (110) and which increases the area of ​​the receiving space (111) due to the pressure difference between the outside and the receiving space (111) when the sealing sheet (120) is open, wherein the shape-variable part (113) includes a first folded part (113b) formed to be foldable and unfoldable on the container body (110).

[0022] Additionally, it is preferable that the first fold portion (113b) be formed to be folded into a plurality of joints where the side and bottom edges of each of the container bodies (110) are connected.

[0023] Additionally, it is preferable that the first corrugated portion (113b) protrudes downward from the container body (110) due to the pressure difference between the outside of the container body (110) and the receiving space portion (111) and the load of the contents through the separation of the sealing paper (120), thereby allowing the water level of the contents contained inside the container body (110) to be lowered.

[0024] Additionally, it is preferable that the shape-variable part (113) further includes a plurality of joints where the sides of each of the container bodies (110) are connected to each other, and a second foldable part (113') formed to protrude from the lower surface of the container body (110) toward the receiving space part (111), which is capable of folding and unfolding. Effects of the invention

[0025] According to the present invention, through structural improvements of the packaging container including a shape-variable part produced by a simplified process and suppressing the use of unnecessary materials distinct from conventional methods, the loss of contents is prevented by providing the effect of lowering the water level within the receiving space so that the contents are not lost even with only the operation of partially opening the sealing film. Brief explanation of the drawing

[0026] FIG. 1 is a drawing illustrating a packaging container capable of adjusting the area of ​​a receiving space using a pressure difference in which a shape-variable part is formed according to a first embodiment of the present invention. FIG. 2 is a cross-sectional view of FIG. 1. Figure 3 is a diagram showing the operational relationship of the groove portion for Figure 1. FIG. 4 is a drawing illustrating a packaging container capable of adjusting the area of ​​a receiving space using a pressure difference in which a shape-variable part is formed according to a second embodiment of the present invention. Fig. 5 is a cross-sectional view of Fig. 4. FIG. 6 is a diagram showing the functional relationship of the second fold portion with respect to FIG. 1. FIG. 7 is a drawing illustrating another embodiment of the second fold portion according to FIG. 6. FIGS. 8 and FIGS. 9 are drawings illustrating a conventional packaging container. Specific details for implementing the invention

[0027] Hereinafter, various embodiments are described in more detail with reference to the attached drawings. The embodiments described in this specification may be modified in various ways. Specific embodiments may be depicted in the drawings and described in detail in the detailed description. However, specific embodiments disclosed in the attached drawings are intended only to facilitate understanding of various embodiments. Accordingly, the technical concept is not limited by specific embodiments disclosed in the attached drawings, and it should be understood that it includes all equivalents or substitutions that fall within the spirit and scope of the invention.

[0028] Terms including ordinal numbers, such as first, second, etc., may be used to describe various components, but these components are not limited by the aforementioned terms. The aforementioned terms are used solely for the purpose of distinguishing one component from another.

[0029] In this specification, terms such as “comprising” or “having” are intended to specify the existence of the features, numbers, steps, actions, components, parts, or combinations thereof described in the specification, and should be understood as not precluding the existence or addition of one or more other features, numbers, steps, actions, components, parts, or combinations thereof. When a component is described as being “connected” or “connected” to another component, it should be understood that it may be directly connected to or connected to that other component, or that there may be other components in between. On the other hand, when a component is described as being “directly connected” or “directly connected” to another component, it should be understood that there are no other components in between.

[0030] Furthermore, in describing the present invention, if it is determined that a detailed description of related known functions or configurations may unnecessarily obscure the essence of the invention, such detailed description is abbreviated or omitted.

[0032] Hereinafter, with reference to the attached drawings, a packaging container capable of adjusting the area of ​​a receiving space using a pressure difference according to the present invention (hereinafter briefly referred to as the 'packaging container') will be described in detail for each embodiment.

[0033] Before the explanation, the packaging container (1) in the present invention may be molded from PET (polyethylene terephthalate) or PP (polypropylene) material, that is, a material in which a pressure difference can occur between the outside and the receiving space (111). In order to clearly understand the gist of the present invention, a detailed description of the material of the packaging container (1) is omitted.

[0034] First, the packaging container (1) according to the present invention comprises, as shown in FIGS. 1 to 3, a container body (110) and a sealing sheet (120).

[0035] For example, the container body (110) is configured to accommodate contents (10) including chicken liquid and pickled radish inside, as described above.

[0036] To this end, the container body (110) has an open top, and a receiving space (111) for receiving contents (10) is formed inside.

[0037] As illustrated, the container body (110) can be molded in a cylindrical shape, in addition to the shape of a square box as an example, and a flange is molded to protrude outwardly from the upper edge for sealing (attaching) a sealing sheet (120).

[0038] The container body (110) according to the present invention includes a shape-variable part (113) whose shape can be varied due to the occurrence of a pressure difference between the inside and outside of the receiving space (111) as the sealing sheet (120) is opened, and the shape-variable part (113) includes a groove part (113a) in the first embodiment or a first fold part (113b) in the second embodiment.

[0039] As shown in the illustration, the groove (113a) of the first embodiment is formed in a curved hemispherical shape on at least one of the plurality of sides formed on the container body (110).

[0040] To this end, the cross-sectional thickness (T2) of the groove (113a) is formed to be thinner than the cross-sectional thickness (T1) of the side forming the container body (110), so that the shape deformation occurs easily due to the pressure difference caused by the opening of the sealing sheet (120).

[0041] At this time, it is desirable that the ratio of the desired thickness difference (%) between them is such that when the side cross-sectional thickness (T1) is '1', the cross-sectional thickness (T2) of the groove (113a) has a difference of '0.3', and the above-mentioned threshold value can be applied equally to the corrugated portion (113b) in the second embodiment described later.

[0042] Meanwhile, in the present invention, the groove (113a) is subjected to a process method in which, prior to the filling of the contents (10) into the receiving space (111) through an unillustrated manufacturing device (not illustrated), the groove (113a) is pressed from outside the container body (110) so that it protrudes toward the receiving space (111), the contents (10) are filled, the receiving space (111) is sealed (vacuumed) by attaching a sealing sheet (120), and the pressure on the groove (113a) is released.

[0043] Through the above-described process method, the groove (113a) can be stored and moved while the contents (10) are filled to fill the container body (110) in a state where no pressure change occurs in the sealed receiving space (111) and the shape protruding toward the receiving space (111) is satisfied.

[0044] In addition, when a user separates the sealing film (120) to consume the contents (10) and a pressure difference occurs in the receiving space (111) due to communication with the outside through the open upper part of the container body (110), the groove (113a) undergoes a shape change that causes it to swell outward from the container body (110) due to the volume of the filled contents (10), and as a result of this shape change, the water level (W / L) of the contents (10) is lowered, thereby preventing external loss.

[0045] In addition, the first corrugated portion (113b) according to the second embodiment of the shape-variable portion (113) can be molded to have a band shape in the portion connecting the lower side and the lower surface of the container body (110), as shown in FIGS. 4 to 6.

[0046] As described above, the thickness (T2) of the first fold (113b) is formed to be smaller than the cross-sectional thickness (T1) of the side or bottom surface of the container body (110).

[0047] The above-mentioned first folded portion (113b) can also be prepared in a process similar to the groove portion (113a) in the first embodiment, in which the contents (10) are filled while maintaining pressure so that the first folded portion (113b) is folded through a manufacturing device (not shown) that is not shown, while the contents (10) are not filled in the receiving space portion (111), and then the contents (10) are filled, and the receiving space portion (111) is sealed by attaching a sealing sheet (120), and then the pressure on the first folded portion (113b) is released.

[0048] Through the above-described process method, the first folded portion (113b) does not cause a pressure change in the sealed receiving space (111), so that the contents (10) can be filled and stored and moved in a folded state toward the receiving space (111), thereby filling the container body (110).

[0049] In addition, when a user separates the sealing film (120) to consume the contents (10) and a pressure difference occurs in the receiving space (111) due to communication with the outside through the open upper part of the container body (110), the first fold (113b) undergoes a shape change in which the lower surface of the container body (110) protrudes downward due to the weight of the filled contents (10) and the first fold (113b) unfolds. Due to this shape change, the water level (W / L) of the contents (10) is lowered, thereby preventing external loss.

[0050] That is, the shape-variable part (113) in the present invention enables a change in the water level of the contents (10) filled in the receiving space (111) simply by opening the sealing sheet (120), thereby preventing loss to the outside of the container body (110).

[0051] Meanwhile, the shape-variable part (113) according to the second embodiment of the present invention may further include a second fold part (113b') that can be used together or separately in addition to the first fold part (113b) described above, as illustrated in FIG. 7.

[0052] As an example, the second fold (113b') may be formed so as to be radially foldable and unfoldable at a joint where a plurality of sides forming the container body (110) are connected to each other, or on the lower surface of the container body (110), as illustrated.

[0053] Here, the second corrugated portion (113b') formed in multiple portions at the joint of the container body (110) spreads out so that the surface area of ​​the container body (110) can be widened in the lateral direction when a pressure difference between the inside and outside of the container body (110) occurs through the opening of the sealing sheet (120), thereby allowing the liquid level of the contents contained in the receiving space (111) to be lowered and preventing overflow.

[0054] Additionally, another second corrugated portion (113b') formed on the lower surface of the container body (110) has a cone shape that protrudes upward into the receiving space (111) when the sealing sheet (120) is closed, as illustrated, but when the sealing sheet (120) is opened and a pressure difference occurs between the inside and outside of the container body (110), the second corrugated portion (113b') having a cone shape protrudes downward so that the liquid level of the contents contained in the receiving space (111) can be lowered, thereby preventing overflow.

[0055] As described above, the packaging container (1) according to the present invention prevents the loss of contents (10) by providing the effect of lowering the water level (W / L) within the receiving space (111) so that the contents (10) are not lost, through a structural improvement of the packaging container (1) including a shape-variable part (113) according to the first or second embodiment produced by suppressing the use of unnecessary materials and a simplified process that is distinct from the conventional one.

[0057] As described above, the present invention has been explained by specific details such as specific components, limited embodiments, and drawings; however, this is provided merely to aid in a more comprehensive understanding of the invention, and the invention is not limited to the above embodiments. A person skilled in the art can make various modifications and variations from this description.

[0058] Accordingly, the scope of the present invention should not be limited to the described embodiments, and all things equivalent to or having equivalent variations to the claims set forth below, as well as the claims set forth below, shall be considered to fall within the scope of the concept of the present invention. Explanation of the symbols

[0059] 1: A packaging container capable of adjusting the area of ​​a receiving space using a pressure difference according to the present invention 100: Container body 111: Accommodation space section 113: Shape-variable section 113a: Groove 113b: First fold 113b': Second fold 200: Sealing paper 10: Contents W / L: Water level

Claims

Claim 1 delete Claim 2 delete Claim 3 delete Claim 4 A packaging container comprising a container body (110) having a receiving space (111) formed therein that is open to the inside and communicates with the upper portion, and in which contents are filled, and a sealing sheet (120) attached to the upper portion of the open container body (110) so as to be openable and closable and capable of sealing the receiving space (111); wherein the packaging container comprises a shape-variable portion (113) formed on the outer surface of the container body (110) and which increases the area of ​​the receiving space (111) due to a pressure difference between the outside and the receiving space (111) when the sealing sheet (120) is open; wherein the shape-variable portion (113) includes a first fold portion (113b) formed to be foldable and unfoldable on the container body (110), and the first fold portion (113b) is formed to be folded at a plurality of joints where the side and bottom edges of each of the container body (110) are connected, and A packaging container capable of adjusting the area of ​​the receiving space using a pressure difference, characterized in that the first corrugated portion (113b) protrudes downward from the container body (110) by means of the pressure difference between the outside of the container body (110) and the receiving space portion (111) and the load of the contents through the separation of the sealing paper (120). Claim 5 delete Claim 6 delete Claim 7 delete

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