Packaging material, and method and apparatus for manufacturing the same

Abstract

The present invention relates to a method for manufacturing a packaging material comprising: (a) a step of placing a second film on a first film; (b) a step of injecting a hydrogel between the first film and the second film; and (c) a step of sealing the first film and the second film; wherein the hydrogel absorbs carbon dioxide.

Description

Technology Field

[0001] The present invention relates to a packaging material, a method for manufacturing the same, and an apparatus for manufacturing the same. Background Technology

[0002] Interest in global warming is growing due to the increase in carbon dioxide emissions. Consequently, research into methods to reduce carbon dioxide generation is active. In this regard, the food industry is also actively researching methods to remove naturally occurring carbon dioxide during storage, as the resulting expansion can cause damage to products such as coffee and kimchi.

[0003] In the case of coffee and kimchi, methods have been devised to remove carbon dioxide from the inside by placing a carbon dioxide absorption sachet inside or by placing a degassing valve in the packaging material.

[0004] However, in the case of packaged kimchi, the aforementioned pouch is in contact with the contents, so concerns regarding hygiene and interference with the contents frequently lead to a decrease in absorption function. Additionally, since the pouch is fixed to the inner wall of the packaging material by heat sealing, it is difficult to apply this method to large-capacity kimchi weighing 1 kg or more in terms of structural, physical, and economic aspects, so there is a limitation in that most large-capacity kimchi is distributed with simple string ties.

[0005] The technology forming the background of the present invention is disclosed in Korean Registered Patent Publication No. 10-2675558. The said registered patent relates to a kimchi ripeness indicator attached to a kimchi packaging material in which a permeable film, an indicator film, and a barrier film are sequentially laminated. The said indicator is attached to the packaging material and changes color by absorbing carbon dioxide generated from the kimchi inside the packaging material, but it does not recognize a carbon dioxide absorbent in the form of a hydrogel. The problem to be solved

[0006] The present invention aims to solve the problems of the aforementioned prior art by providing a packaging material that absorbs carbon dioxide, a method for manufacturing the same, and an apparatus for manufacturing the same.

[0007] However, the technical problems that the embodiments of the present invention aim to solve are not limited to those described above, and other technical problems may exist. means of solving the problem

[0008] As a technical means for achieving the above-mentioned technical problem, the first aspect of the present invention relates to a method for manufacturing a packaging material comprising: (a) a step of placing a second film on a first film; (b) a step of injecting a hydrogel between the first film and the second film; and (c) a step of sealing the first film and the second film; wherein the hydrogel absorbs carbon dioxide.

[0009] According to one embodiment of the present invention, step (a) may include (a-1) a step of sealing at least one surface of the empty space between the first film and the second film, but is not limited thereto.

[0010] According to one embodiment of the present invention, step (c) may seal the remaining surfaces of the empty space excluding the sealed surface, but is not limited thereto.

[0011] According to one embodiment of the present invention, the first film and the second film may be sealed using a method selected from the group consisting of heat, ultrasound, high frequency, adhesive, and combinations thereof, but are not limited thereto.

[0012] According to one embodiment of the present invention, either the first film and the second film may have a gas permeability higher than the moisture permeability, and the other may include moisture barrier properties and gas barrier properties, but are not limited thereto.

[0013] According to one embodiment of the present invention, any one of the above may include HDPE (high density polyethylene), but is not limited thereto.

[0014] According to one embodiment of the present invention, the hydrogel may include a carbon dioxide absorbent that absorbs carbon dioxide, an indicator that changes the color of the hydrogel according to the absorption of carbon dioxide, and a property modifier that controls the physical properties of the hydrogel, but is not limited thereto.

[0015] According to one embodiment of the present invention, the carbon dioxide absorbent may include, but is not limited to, a material selected from the group consisting of sodium carbonate, potassium carbonate, calcium carbonate, and combinations thereof.

[0016] According to one embodiment of the present invention, the step (b) may include, but is not limited to, (b-1) forming a void space between the first film and the second film; and (b-2) injecting the hydrogel into the void space through at least one of the open sides of the void space.

[0017] According to one embodiment of the present invention, the method may further include the steps of placing a third film on the second film and sealing the second film and the third film, but is not limited thereto.

[0018] In addition, the second aspect of the present invention relates to a packaging material manufacturing apparatus for performing a method of manufacturing a packaging material according to the first aspect, comprising: a first roll on which a first film is wound; a second roll on which a second film is wound; a hydrogel injection unit for injecting a hydrogel between the first film and the second film; a sealing unit for sealing the first film and the second film; and a control unit for controlling the operation of the hydrogel injection unit and the sealing unit; wherein the first roll and the second roll are arranged to rotate independently while being spaced apart from each other, and a void space is formed between the first film supplied from the first roll and the second film supplied from the second roll, and a hydrogel is injected into the void space.

[0019] In addition, a third aspect of the present invention relates to a packaging material manufactured by the method according to the first aspect.

[0020] The means for solving the problem described above are merely exemplary and should not be interpreted as intended to limit the present invention. In addition to the exemplary embodiments described above, additional embodiments may exist in the drawings and the detailed description of the invention. Effects of the invention

[0021] When distributing and storing products that generate carbon dioxide during storage, such as kimchi, the packaging may expand due to the carbon dioxide, potentially damaging the product.

[0022] According to the means for solving the problem of the present invention described above, the packaging material according to the present invention includes a hydrogel that absorbs carbon dioxide, so that even when packaging a product that generates carbon dioxide, it can absorb carbon dioxide and prevent damage to the product.

[0023] In addition, the degree of carbon dioxide absorption of the above packaging material can be visually confirmed.

[0024] In addition, since one side of the packaging material selectively permeates carbon dioxide without permeating moisture, and the other side of the packaging material prevents external air and moisture from penetrating into the hydrogel of the packaging material, the loss of functionality due to moisture during storage of the product can be prevented.

[0025] In addition, the manufacturing apparatus and method of the above packaging material have a small increase in production costs because an injection device and process for hydrogel coating are added to the production equipment of conventional packaging materials.

[0026] In addition, when manufacturing the above packaging material, since the hydrogel is injected after the two films are first sealed, it is possible to prevent the films from moving while injecting the hydrogel.

[0027] However, the effects obtainable from this invention are not limited to those described above, and other effects may exist. Brief explanation of the drawing

[0028] FIG. 1 is a flowchart illustrating a method for manufacturing a packaging material according to one embodiment of the present invention. FIGS. 2a to 2d are schematic diagrams showing packaging materials at each step of a method for manufacturing packaging materials according to one embodiment of the present invention. FIG. 3 is a schematic diagram showing a part of a method for manufacturing a packaging material according to one embodiment of the present invention. FIG. 4 is a schematic diagram of a packaging material according to one embodiment of the present invention. FIG. 5 is a schematic diagram of a packaging material according to one embodiment of the present invention. FIG. 6 is a schematic diagram of a manufacturing apparatus for packaging materials according to one embodiment of the present invention. FIG. 7 is a schematic diagram of a hydrogel injection part according to one embodiment of the present invention. FIG. 8 is a photograph of a packaging material according to one embodiment of the present invention. Figure 9 is a graph showing the carbon dioxide absorption functionality of a hydrogel according to one embodiment of the present invention. Specific details for implementing the invention

[0029] Below, embodiments of the present invention are described in detail with reference to the attached drawings so that those skilled in the art can easily implement them.

[0030] However, the present invention may be implemented in various different forms and is not limited to the embodiments described herein. Furthermore, in order to clearly illustrate the present invention in the drawings, parts unrelated to the description have been omitted, and similar parts throughout the specification have been given similar reference numerals.

[0031] Throughout this specification, when a part is described as being "connected" to another part, this includes not only cases where they are "directly connected," but also cases where they are "electrically connected" with other elements interposed between them.

[0032] Throughout the entire specification, when a component is described as being located "on," "on top," "on top," "under," "on bottom," or "on bottom" of another component, this includes not only cases where the component is in contact with the other component but also cases where another component exists between the two components.

[0033] Throughout this specification, when a part is described as "comprising" a certain component, this means that, unless specifically stated otherwise, it does not exclude other components but may include additional components.

[0034] Hereinafter, a packaging material according to one embodiment and example of the present invention, a method for manufacturing the same, and an apparatus for manufacturing the same will be described.

[0035] As a technical means for achieving the above-mentioned technical problem, the first aspect of the present invention relates to a method for manufacturing a packaging material comprising: (a) a step of placing a second film (120) on a first film (110); (b) a step of injecting a hydrogel (130) between the first film (110) and the second film (120); and (c) a step of sealing the first film (110) and the second film (120); wherein the hydrogel (130) absorbs carbon dioxide.

[0036] Additionally, a second aspect of the present invention relates to a packaging material manufacturing apparatus for performing a method of manufacturing a packaging material according to the first aspect, comprising: a first roll (111) on which a first film (110) is wound; a second roll (121) on which a second film (120) is wound; a hydrogel injection unit (131) for injecting a hydrogel (130) between the first film (110) and the second film (120); a sealing unit (141) for sealing the first film (110) and the second film (120); and a control unit for controlling the operation of the hydrogel injection unit (131) and the sealing unit (141). The invention relates to a packaging material manufacturing device comprising, wherein the first roll (111) and the second roll (121) are spaced apart from each other and arranged to rotate independently, and a void space is formed between the first film (110) supplied from the first roll (111) and the second film (120) supplied from the second roll (121), and a hydrogel (130) is injected into the void space.

[0037] In addition, a third aspect of the present invention relates to a packaging material manufactured by the method according to the first aspect.

[0038] The packaging material manufacturing device according to the second aspect above is intended to perform the method of manufacturing the packaging material according to the first aspect above, and as a result, the packaging material according to the third aspect above is manufactured. Hereinafter, the method of manufacturing the packaging material according to the first aspect is described in accordance with the packaging material manufacturing device according to the second aspect.

[0039] FIG. 1 is a flowchart showing a method for manufacturing a packaging material according to one embodiment of the present invention, and FIG. 2a to 2d are schematic diagrams showing packaging materials at each step of the method for manufacturing a packaging material according to one embodiment of the present invention.

[0040] In addition, FIG. 3 is a schematic diagram showing a part of a method for manufacturing a packaging material according to one embodiment of the present invention, and FIG. 4 and FIG. 5 are schematic diagrams of a packaging material according to one embodiment of the present invention.

[0041] Additionally, FIG. 6 is a schematic diagram of a manufacturing apparatus for packaging materials according to one embodiment of the present invention, and FIG. 7 is a schematic diagram of a hydrogel injection unit (131) according to one embodiment of the present invention. At this time, FIG. 2a to 2d correspond to schematic diagrams depicting the first film (110) and the second film (120) in FIG. 6A to D.

[0042] First, a second film (120) is placed on a first film (110) (S100).

[0043] Placing the second film (120) on the first film (110) involves placing the second film (120), supplied by the second roll (121), on the first film (110) supplied by the first roll (111) while rotating. At this time, there is an empty space between the first film (110) and the second film (120) (Fig. 2a).

[0044] According to one embodiment of the present invention, step (a) may include (a-1) a step of sealing at least one surface of the empty space between the first film (110) and the second film (120), but is not limited thereto.

[0045] As shown in FIG. 2b, at least one surface is sealed. Referring to FIG. 2b, one surface of the first film (110) and the second film (120) is a sealed surface (140), and the other three surfaces are unsealed surfaces, so that the hydrogel (130) can be injected into the empty space between the first film (110) and the second film (120) through the unsealed surfaces. However, FIG. 2b shows only one surface sealed (140), but there may be two or three sealed surfaces, and if the empty space includes at least one unsealed surface, the number of sealed surfaces may be one or more.

[0046] The sealing of step (a-1) above can be performed by the first sealing part (1411). As will be described later, the first film (110) and the second film (120) are sealed using a method selected from the group consisting of heat, ultrasound, high frequency, adhesive, and combinations thereof.

[0047] Next, a hydrogel (130) is injected between the first film (110) and the second film (120) (S200).

[0048] According to one embodiment of the present invention, the hydrogel (130) may include a carbon dioxide absorbent that absorbs carbon dioxide, an indicator that changes the color of the hydrogel (130) according to the absorption of carbon dioxide, and a physical property regulator that controls the physical properties of the hydrogel (130), but is not limited thereto.

[0049] According to one embodiment of the present invention, the carbon dioxide absorbent may include, but is not limited to, a material selected from the group consisting of sodium carbonate, potassium carbonate, calcium carbonate, and combinations thereof.

[0050] The above-mentioned physical property modifier may include a superabsorbent resin and a viscosity modifier, but is not limited thereto.

[0051] The carbon dioxide absorbent material described above has carbon dioxide absorption capabilities in the presence of moisture and may include soluble sodium carbonate. Additionally, to prepare the carbon dioxide absorbent material in a gel form, a super absorbent polymer was mixed with the absorbent material to provide gel-forming ability in small amounts. Subsequently, to control the viscosity of the hydrogel (130), a viscosity modifier such as glycerin or starch was added as a physical property modifier.

[0052] When the carbon dioxide absorbent of the hydrogel (130) absorbs carbon dioxide, the pH of the hydrogel (130) changes from alkaline to neutral. Therefore, in order to confirm the change in pH of the hydrogel (130) by color through the indicator, an indicator that changes color as the pH decreases (becomes acidic) can be added to the hydrogel (130). For example, the indicator may include phenolphthalein, and the absorption of carbon dioxide can be confirmed by the hydrogel (130) changing from pink to white through the phenolphthalein.

[0053] According to one embodiment of the present invention, step (b) may include, but is not limited to, (b-1) forming a void space between the first film (110) and the second film (120); and (b-2) injecting the hydrogel (130) into the void space through at least one of the open sides of the void space.

[0054] Referring to FIG. 2b, at least one side of the empty space between the first film (110) and the second film (120) is sealed in step (a-1). Because the first film (110) and the second film (120) are partially fixed by the sealing in step (a-1), when force is applied in both directions of the sealed side (140), the first film (110) bends upward and the second film (120) bends downward, forming an empty space between the first film (110) and the second film (120). Subsequently, the hydrogel (130) can be injected through the open side of the empty space (the side not sealed in step (a-1)). However, the empty space between the first film (110) and the second film (120) can also be formed by injecting the hydrogel injection part (131) through the open surface of the empty space.

[0055] Referring to FIG. 2c, it can be seen that one side between the first film (110) and the second film (120) is a sealed side (140), the remaining three sides are not sealed, and a hydrogel (130) is injected into the empty space.

[0056] Referring to FIG. 3, the hydrogel injection unit (131) can inject the hydrogel (130) so that the length of the hydrogel (130) is adjusted to match the width direction length (length between eyemark-1 and eyemark-2) of the packaging material to be finished. For example, if the width direction length of the packaging material is 150 mm, the hydrogel (130) can be injected so that the coating length is 110 mm, which is [{(150-0) / 2}-20]*2.

[0057] Referring to FIG. 6, the hydrogel injection part (131) is positioned to be injected into the empty space.

[0058] In this regard, referring to FIG. 7 above, the hydrogel injection unit (131) includes a hydrogel storage unit (1311) in which a hydrogel (130) is stored; a first pipe unit (1312) through which the hydrogel (130) of the hydrogel storage unit passes; a hydrogel discharge unit (1313) disposed at one end of the pipe unit and injecting the hydrogel (130) into the empty space; and a hydrogel suction unit (not shown) for sucking the hydrogel (130). Since the hydrogel (130) discharged from the hydrogel discharge unit and injected into the empty space may interfere with the sealing of step (c) to be described later, if a hydrogel (130) exceeding the specified amount is injected through the hydrogel suction unit, the excess amount of hydrogel (130) can be sucked in.

[0059] Specifically, since the viscosity of the hydrogel (130) changes with temperature, the hydrogel storage unit maintains a constant temperature of the stored hydrogel (130) and continuously stirs to prevent crystallization. Subsequently, the hydrogel (130) is injected into the empty space between the first film (110) and the second film (120) supplied by the rotation of the first roll (111) and the second roll (121), and the hydrogel (130) is injected precisely using a metering pump. When the injected hydrogel (130) is injected into a part intended for sealing, it can be sucked in through the hydrogel suction unit.

[0060] The first pipe section (1312) is for adjusting the distance between the hydrogel discharge section and the hydrogel storage section. As shown in FIG. 3, when the hydrogel (130) is injected into the empty space multiple times at regular intervals, the length of the first pipe section (1312) can be adjusted to control the position where the hydrogel (130) is injected into the empty space.

[0061] Next, the first film (110) and the second film (120) are sealed (S300).

[0062] In step (c) above, the sealing of the first film (110) and the second film (120) can be performed by the second sealing part (1412).

[0063] According to one embodiment of the present invention, step (c) may seal the remaining surfaces of the empty space excluding the sealed surface, but is not limited thereto.

[0064] In step (a-1) above, one side (140) of the empty space between the first film (110) and the second film (120) is sealed (Fig. 2b). Step (c) is to seal the other sides that were not sealed in step (a-1).

[0065] According to one embodiment of the present invention, the first film (110) and the second film (120) may be sealed using a method selected from the group consisting of heat, ultrasound, high frequency, adhesive, and combinations thereof, but are not limited thereto.

[0066] Referring to FIG. 2d, the surfaces that were not sealed in FIG. 2c are sealed by step (c), so that the hydrogel (130) is placed inside the first film (110) and the second film (120), and the hydrogel (130) is not leaked out by the sealing.

[0067] In this regard, in the case of FIG. 2d, it is difficult to distinguish the sealed surface (140) due to the limitations of the drawing, but as can be seen in FIG. 2b and FIG. 4a, the sealed surface (140) refers to the part where the first film (110) and the second film (120) are in contact.

[0068] According to one embodiment of the present invention, either of the first film (110) and the second film (120) may have a gas permeability higher than the moisture permeability, and the other may have moisture barrier properties and gas barrier properties, but is not limited thereto.

[0069] According to one embodiment of the present invention, any one of the above may include HDPE (high density polyethylene), but is not limited thereto. In addition, the other one may include LLDPE, but is not limited thereto. In this case, any one of the above may include at least two layers of HDPE, but is not limited thereto.

[0070] According to one embodiment of the present invention, the first film (110) has a gas permeability higher than the moisture permeability, and the second film (120) may include moisture barrier properties and gas barrier properties, but is not limited thereto.

[0071] Specifically, the first film (110) may have low moisture permeability and high gas permeability, and the second film (120) may have moisture barrier and gas barrier properties. That is, regarding an object that emits carbon dioxide placed inside the packaging material, the first film (110) may be positioned in a direction close to the object, and the second film (120) may be positioned in a direction far from the object. When carbon dioxide is emitted from the object, due to the gas permeability of the first film (110), the carbon dioxide passes through the first film (110) and reacts with the hydrogel (130), and the hydrogel (130) absorbs the carbon dioxide. On the other hand, moisture and carbon dioxide from the outside of the packaging material do not penetrate into the packaging material due to the moisture barrier and gas barrier properties of the second film (120), so the hydrogel (130) absorbs only the carbon dioxide generated from the object.

[0072] According to one embodiment of the present invention, the method may further include the steps of placing a third film on the second film (120) and sealing the second film (120) and the third film, but is not limited thereto. The third film may be placed on top of the second film (120) to protect the second film (120) from external damage and prevent external moisture or gas from penetrating the object.

[0073] In the packaging material manufacturing device according to FIG. 6, the placement of the third film may be performed between the first sealing part (1411) and the hydrogel injection part (131), and between the hydrogel injection part (131) and the second sealing part (1412), before the first film (110) and the second film (120) pass through the first sealing part (1411). Additionally, the second sealing part (1412) may seal the second film (120) and the third film together while sealing the unsealed surfaces of the first film (110) and the second film (120).

[0074] The present invention is to be explained in more detail through the following examples, but the following examples are for illustrative purposes only and are not intended to limit the scope of the present invention.

[0075] [Example]

[0076] First, to prepare a hydrogel capable of absorbing carbon dioxide, sodium carbonate, a superabsorbent resin, and a phenolphthalein indicator were mixed, and then glycerin and starch were added to control viscosity. Subsequently, the hydrogel was placed in a hydrogel storage tank and continuously stirred to prevent crystallization while maintaining the temperature at 30°C.

[0077] In addition, a film roll composed of two layers of HDPE film having selective permeability to provide water resistance and gas permeability, and an LLDPE film roll that does not have permeability to moisture and gas were prepared. Subsequently, the film rolls were rotated so that the LLDPE film was spaced apart from the HDPE film. Then, after bringing the HDPE film and the LLDPE film into contact according to a certain standard, a preliminary seal was applied to one of the multiple surfaces where the two films come into contact.

[0078] Next, a hydrogel was injected between the HDPE film and the LLDPE film. At this time, the injection speed was targeted to be once every 2 seconds. In addition, although the coating specifications varied depending on the size of the finished packaging material, the hydrogel was injected and coated to have a width of 10 mm and a length of 110 mm (in the case where the width of the packaging material is 150 mm).

[0079] Referring to FIG. 8, the hydrogel may be coated by being injected multiple times at regular intervals.

[0080] Next, an outer packaging film was placed on the LLDPE film, and the LLDPE film and the outer packaging film were sealed with other unsealed surfaces between the HDPE film and the LLDPE film to prevent the hydrogel from leaking out, thereby forming a packaging material.

[0081] Next, the packaging material was shaped into a bag so that the side with the HDPE film went inside the bag.

[0082] [Experimental Example 1]

[0083] As a result of analyzing the carbon dioxide absorption performance of the above hydrogel, it was confirmed that the carbon dioxide absorption capacity was approximately 300 cc per g under refrigerated conditions, and this was confirmed to be the same as the carbon dioxide absorption capacity of Ca(OH)2 used in conventional sachets.

[0084] Referring to Fig. 9, it can be seen that it exhibits excellent carbon dioxide absorption performance at 10°C and 25°C.

[0085] The foregoing description of the present invention is for illustrative purposes only, and those skilled in the art will understand that other specific forms can be easily modified without altering the technical concept or essential features of the present invention. Therefore, the embodiments described above should be understood as illustrative in all respects and not restrictive. For example, each component described as a single unit may be implemented in a distributed manner, and components described as distributed may likewise be implemented in a combined form.

[0086] The scope of the present invention is defined by the claims set forth below rather than by the detailed description above, and all modifications or variations derived from the meaning and scope of the claims and the concept of equivalents thereof should be interpreted as being included within the scope of the present invention.

Claims

Claim 1 A method for manufacturing a packaging material comprising: (a) a step of placing a second film on a first film; (b) a step of injecting a hydrogel between the first film and the second film; and (c) a step of sealing the first film and the second film; wherein the hydrogel absorbs carbon dioxide, the first film has a gas permeability higher than its moisture permeability, and the second film is configured to have moisture barrier properties and gas barrier properties, wherein with respect to an object placed on one side of the packaging material that emits carbon dioxide, the first film is positioned in a direction close to the object and the second film is positioned in a direction far from the object, wherein carbon dioxide emitted from the object passes through the first film and reacts with the hydrogel, and moisture and carbon dioxide from the other side of the packaging material are configured not to penetrate into one side of the packaging material due to the moisture barrier properties and gas barrier properties of the second film. Claim 2 A method for manufacturing a packaging material according to claim 1, wherein step (a) comprises (a-1) a step of sealing at least one surface of the empty space between the first film and the second film. Claim 3 A method for manufacturing a packaging material according to paragraph 2, wherein step (c) is to seal the remaining surfaces of the empty space excluding the sealed surface. Claim 4 A method for manufacturing a packaging material according to claim 2, wherein step (a-1) and step (c) seal the first film and the second film using a method selected from the group consisting of heat, ultrasound, high frequency, adhesive, and combinations thereof. Claim 5 delete Claim 6 A method for manufacturing a packaging material according to claim 1, wherein the first film comprises HDPE (high density polyethylene). Claim 7 A method for manufacturing a packaging material according to claim 1, wherein the hydrogel comprises a carbon dioxide absorbent that absorbs carbon dioxide, an indicator that changes the color of the hydrogel according to the absorption of carbon dioxide, and a physical property modifier that controls the physical properties of the hydrogel. Claim 8 A method for manufacturing a packaging material according to claim 7, wherein the carbon dioxide absorbent comprises a material selected from the group consisting of sodium carbonate, potassium carbonate, calcium carbonate, and combinations thereof. Claim 9 A method for manufacturing a packaging material according to claim 1, wherein step (b) comprises: (b-1) forming a void space between the first film and the second film; and (b-2) injecting the hydrogel into the void space through at least one of the open sides of the void space. Claim 10 A method for manufacturing a packaging material according to claim 1, further comprising the steps of placing a third film on the second film and sealing the second film and the third film. Claim 11 A packaging material manufacturing apparatus for performing a method of manufacturing a packaging material according to any one of claims 1 to 4 and claims 6 to 10, comprising: a first roll on which a first film is wound; a second roll on which a second film is wound; a hydrogel injection unit for injecting a hydrogel between the first film and the second film; a sealing unit for sealing the first film and the second film; and a control unit for controlling the operation of the hydrogel injection unit and the sealing unit; wherein the first roll and the second roll are arranged to rotate independently while being spaced apart from each other, and a void space is formed between the first film supplied from the first roll and the second film supplied from the second roll, wherein a hydrogel is injected into the void space. Claim 12 A packaging material manufactured by a method according to any one of paragraphs 1 to 4 and paragraphs 6 to 10.

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