Raw materials, film packaging, containers

Abstract

The purpose of the present invention is both to evacuate air between a heat-shrinkable film and a container and to ensure a good appearance of the heat-shrinkable film.　In a raw material (1) according to the present invention, an overlapping portion (120) of a heat-shrinkable film (101) includes an unsealed region (120b) and a sealed region (120a). The unsealed region (120b) communicates from an inner end (102) to an outer end (103) of the raw material (1) in the overlapping portion (120).

Description

Technical Field

[0001] The present invention relates to a base material for cutting a film into a size corresponding to a container to be packaged to obtain a plurality of film packages, a film package cut from the base material into a predetermined size, and a container packaged with the film package.

Background Art

[0002] Conventionally, as a film package for winding a heat-shrinkable film around a product in a cylindrical shape and heating and shrinking the heat-shrinkable film to package the product, there is, for example, a heat-shrinkable cylindrical label disclosed in Patent Document 1. This heat-shrinkable cylindrical label is attached to the product, and the heat-shrinkable label is heated to package the product.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In a conventional heat-shrinkable cylindrical label, the ends of the heat-shrinkable film overlap each other, and the overlapping portions are adhesively bonded to each other in a strip shape along the end direction of the heat-shrinkable film. In the portion adhesively bonded in a strip shape, as shown in FIG. 1 of Patent Document 1, solvent adhesion is continuously performed in a strip shape from one end to the other end in the width direction of the heat-shrinkable cylindrical label at present.

[0005] The raw material for heat-shrinkable tubular labels is typically a roll product in which a strip of heat-shrinkable film is formed into a tube, and the formed tube of heat-shrinkable film (heat-shrinkable tubular label) is wound into a roll downstream. Therefore, if the overlapping ends of the heat-shrinkable film are continuously solvent-bonded in a strip, it becomes difficult for air to escape from inside the heat-shrinkable tubular label (hereinafter referred to as "inside the tube") when winding the label, making it impossible to produce a clean roll product, and potentially causing wrinkles in the raw material. Heat-shrinkable tubular labels cut from a wrinkled raw material (hereinafter referred to as "film packaging") cannot be packaged neatly. Therefore, it is conceivable to make holes in the raw material to release the air inside the tube, but the appearance of the film packaging itself, cut from a raw material with holes, becomes poor.

[0006] Even if the roll of heat-shrinkable tubular label does not wrinkle when it is wound, the film packaging cut from that roll will not produce a clean finish. In other words, when the film packaging is attached to a container and heat-shrinked, the air between the container and the film packaging tries to escape from the tube to the outside. However, as mentioned above, the overlapping parts of the ends of the heat-shrinkable film are continuously bonded together in a strip-like manner using solvent, which can obstruct the escape of air from inside the tube. As a result, air may remain between the container and the film packaging after heat shrinking. When air remains in this way, the container does not look good. It is conceivable to make holes in the film packaging itself to release the air that remains between the container and the film packaging, but this would make the film packaging itself look bad.

[0007] Thus, when winding heat-shrinkable tubular labels into a roll, it was difficult to achieve both the need to remove air from inside the tube and the need to ensure the appearance of the film packaging itself after cutting from the roll, and also difficult to achieve both the need to remove air remaining between the container and the film packaging and the need to ensure the appearance of the film packaging itself.

[0008] One aspect of the present invention aims to realize a raw material that enables both the removal of air from inside the tube and the assurance of a good appearance of the film packaging itself when winding a heat-shrinkable tubular label into a roll, and ultimately to realize a film packaging that enables both the removal of air between the container and the film packaging and the assurance of a good appearance of the film packaging itself. [Means for solving the problem]

[0009] To solve the above problems, the raw material according to Embodiment 1 of the present invention is a raw material for obtaining multiple film packaging bodies by overlapping the ends of heat-shrinkable films at the overlapping portion and cutting them to the size of the container to be packaged, wherein the overlapping portion of the heat-shrinkable films includes an unsealed region where the heat-shrinkable films are not sealed to each other and a sealed region where the heat-shrinkable films are sealed to each other, and the unsealed region communicates with the outside of the tube of the raw material at the overlapping portion.

[0010] According to the above configuration, the non-sealed area communicates with the outside of the film roll at the overlapping portion. This allows air to escape from inside the roll when the roll is wound into a roll shape, making it easier to wind and reducing the likelihood of wrinkles forming on the roll. By wrapping products with film packaging cut from a wrinkle-free roll, a neat packaging can be achieved. Furthermore, when the film packaging shrinks during heat shrinkage, the air between the product and the heat-shrinkable film can be reliably released from the non-sealed area at the overlapping portion to the outside of the heat-shrinkable film. This improves the appearance of the product after it has been packaged with the film packaging. In addition, there is no need to provide holes for air venting in the roll.

[0011] Therefore, when winding the raw material into a roll, it is possible to realize a raw material that can achieve both the removal of air from inside the tube and the assurance of the appearance of the film packaging itself when cut from the raw material, and consequently, a film packaging that can achieve both the removal of air between the film packaging and the container and the assurance of a good appearance of the film packaging itself.

[0012] Furthermore, in the raw material according to embodiment 2 of the present invention, in embodiment 1, the sealed areas and the unsealed areas are alternately arranged along the circumferential direction when the film packaging is attached to the product.

[0013] According to the above configuration, the non-sealed areas are not formed continuously in the direction in which the heat-shrinkable film primarily shrinks (circumferential direction). In other words, since sealed areas are always formed between non-sealed areas in the circumferential direction, the non-sealed areas do not have a continuous shape in the direction that coincides with the direction in which the heat-shrinkable film primarily shrinks (circumferential direction). This reduces the possibility of wrinkles forming in the heat-shrinkable film when it shrinks, for example, during ultrasonic sealing of overlapping portions or when the heat-shrinkable film shrinks during packaging into containers. Furthermore, it reduces the possibility of the sealed areas peeling off due to the shrinkage of the non-sealed areas during the shrinkage of the heat-shrinkable film.

[0014] Furthermore, in the raw material according to embodiment 3 of the present invention, in embodiment 2, a plurality of sealing regions are formed in the overlapping portion, and the non-sealed regions are formed in a substantially grid pattern by connecting the intervals between the plurality of sealing regions.

[0015] According to the above configuration, by forming the non-sealed areas in a grid pattern, it becomes possible to reliably remove air between the heat-shrinkable film and the container.

[0016] Furthermore, in the raw material according to embodiment 4 of the present invention, in embodiment 3, each of the multiple sealing regions is formed to have the same shape as the other sealing regions.

[0017] According to the above configuration, since the shapes of multiple sealing regions are identical, the force sealing the heat-shrinkable films together can be made uniform and unbiased at the overlapping portions. This reduces the possibility of the sealing regions peeling off.

[0018] Furthermore, in the raw material according to embodiment 5 of the present invention, the sealing region is ultrasonically sealed in any one of embodiments 1 to 4.

[0019] The above configuration allows for sealing without the use of solvents or adhesives, resulting in the following advantages: Firstly, the absence of solvents and adhesives reduces the environmental impact. Secondly, the absence of solvents and adhesives reduces the amount of material used in the film packaging, further reducing the environmental impact and facilitating recycling. Furthermore, ultrasonic sealing allows for easy formation of the desired shape and position of the sealing area simply by changing the shape of the anvil roller. Finally, ultrasonic sealing enables faster production of the film compared to heat sealing methods using hot plates.

[0020] Furthermore, the film packaging according to embodiment 6 of the present invention is obtained by cutting the raw material described in any one of embodiments 1 to 5 to the size of the container to be packaged.

[0021] According to the above configuration, similar to the raw material according to Embodiment 1 of the present invention, it is possible to achieve both the removal of air between the film packaging and the container and the assurance of a good appearance for the film packaging itself.

[0022] Furthermore, the container according to embodiment 7 of the present invention is packaged with the film packaging described in embodiment 6.

[0023] According to the above configuration, a container can be provided that achieves both the removal of air between the film packaging and the container and the assurance of a good appearance for the film packaging itself, similar to the film packaging according to aspect 6 of the present invention.

Advantages of the Invention

[0024] According to one aspect of the present invention, there is provided a roll of base material that enables both evacuation of air inside the cylinder when winding the base material in a roll shape and ensuring the appearance of the film package cut from the base material. As a result, it is possible to provide a film package that enables both evacuation of air between the container and the film package and ensuring a good appearance of the film package itself.

Brief Description of the Drawings

[0025] [Figure 1] It is a perspective view showing a schematic configuration of a roll of base material according to the present embodiment. [Figure 2] It is a front view of the overlapping portion of the roll of base material shown in FIG. 1. [Figure 3] It is a cross-sectional view taken along the line AA of FIG. 2. [Figure 4] It is an explanatory diagram for explaining the formation positions of the seal area and the non-seal area in the overlapping portion shown in FIG. 2. [Figure 5] It is a schematic perspective view of a sealing device. [Figure 6] It is a schematic configuration diagram of an anvil portion provided in the sealing device shown in FIG. 5. [Figure 7] It is a schematic configuration diagram of a protrusion formed on the anvil portion shown in FIG. 6. [Figure 8] It is an explanatory diagram of ultrasonic sealing. [Figure 9] It is an explanatory diagram for explaining the packaging of a container with a film package obtained from the roll of base material shown in FIG. 1. [Figure 10] It is an explanatory diagram for explaining the details of the overlapping portion of the film package heat-shrunk and attached to the container. [Figure 11] It is a diagram showing an example of an anvil pattern in the overlapping portion. [Figure 12] It is a diagram showing another example of an anvil pattern in the overlapping portion.

Modes for Carrying Out the Invention

[0026] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In this embodiment, an example will be described in which the raw material according to the present invention is applied to a raw material for obtaining a tubular film packaging body for packaging an object to be packaged. However, the following description is an example of a raw material according to the present invention, and the technical scope of the present invention is not limited to the illustrated example.

[0027] <Overview of the raw material> Figure 1 shows a schematic configuration of the raw material 1 according to this embodiment, where reference numeral 1001 is a perspective view of the heat-shrinkable film 101 constituting the raw material 1, and reference numeral 1002 is a perspective view of the raw material 1 obtained by overlapping the ends of the heat-shrinkable film 101.

[0028] The heat-shrinkable film 101, as shown by reference numeral 1001 in Figure 1, is a rectangular film that, for example, is flexible and has heat shrinkability in a direction perpendicular to the direction in which the overlapping portion 120 described later stretches (the circumferential direction when the heat-shrinkable film 101 is formed in a tubular shape). A known film can be used as the heat-shrinkable film 101. Here, heat shrinkability refers to the property of shrinking when heated to a predetermined temperature (for example, 70°C to 180°C).

[0029] The heat-shrinkable film 101 may be transparent or opaque (for example, milky white). Furthermore, the heat-shrinkable film 101 may be a single layer or a structure consisting of multiple layers. The thickness of the heat-shrinkable film 101 is approximately 15 μm to 100 μm, but is not limited to this range.

[0030] Examples of materials for the heat-shrinkable film 101 include resin compositions mainly comprising one or more thermoplastic resins selected from polyester resins such as polyethylene terephthalate and polylactic acid, olefin resins such as polypropylene, polystyrene resins such as polystyrene, cyclic olefin resins, and vinyl chloride resins. The above-mentioned materials for the film substrate are examples only and are not limited thereto.

[0031] A tubular raw material 1 is formed by overlapping the first end portion 101a, which is one of the side edges of the heat-shrinkable film 101 along the longitudinal direction, and the second end portion 101b, which is the other side edge of the same side edge, as shown by reference numeral 1002 in Figure 1, and sealing the resulting overlapping portion 120. This tubular raw material 1 is a raw material for obtaining multiple film packaging bodies by cutting it to the size of the container (product) to be packaged.

[0032] <Explanation of overlapping sections> Figure 2 is a front view of the overlapping portion 120 of the raw material 1 shown in Figure 1. Figure 3 is a cross-sectional view taken along the line AA in Figure 2. The overlapping portion 120 of the raw material 1 is not entirely sealed, but as shown in Figure 2, it includes a sealed area 120a where the heat-shrinkable films 101 are sealed together, and an unsealed area 120b where the heat-shrinkable films 101 are not sealed together. In Figure 2, the sealed area is the area within the circle indicated by the dotted line. Not all sealed areas are labeled with reference numeral 120a for clarity in the drawing. Because the unsealed area 120b is included in the overlapping portion 120, a space is formed within the overlapping portion 120. In other words, the unsealed area 120b becomes a space. This space communicates with the outside from inside the tube of the raw material 1 to outside the tube. This point will be explained below.

[0033] As shown in Figure 3, the unsealed region 120b is the region where the surfaces of the first end 101a and the second end 101b facing each other are not sealed. In other words, the unsealed region 120b is the region where the first opposing surface 101c on the first end 101a side and the second opposing surface 101d on the second end 101b side face each other and are not sealed. Thus, the unsealed region 120b is the region where the first opposing surface 101c and the second opposing surface 101d are not welded together, and air can pass through it. Furthermore, the unsealed region 120b communicates from the inner end 102 to the outer end 103 in the overlapping portion 120. That is, the unsealed region 120b communicates from the inside to the outside of the roll 1 in the overlapping portion 120.

[0034] The non-sealed area 120b, which communicates from the inside to the outside of the roll of material 1 at the overlapping portion 120, provides the following effects. For example, in the state of the roll of material 1 (before heat shrinkage), the non-sealed area 120b functions as an air vent, making it easier to wind the roll of material 1. Furthermore, when the roll of material 1 is cut to fit the container to be packaged and placed over the container, and the heat-shrinkable film 101 heat-shrinks, it becomes possible to reliably release the air between the container to be packaged and the heat-shrinkable film 101 from the non-sealed area 120b of the overlapping portion 120 to the outside of the heat-shrinkable film 101.

[0035] The sealing area 120a in the overlapping portion 120 is ultrasonically sealed. In this ultrasonic sealing method, frictional heat is generated between the opposing surfaces (first opposing surface 101c and second opposing surface 101d) of the heat-shrinkable film 101 to create a seal. Furthermore, ultrasonic sealing does not require the use of solvents or adhesives, thus offering the following advantages: The absence of solvents and adhesives reduces the environmental impact. In addition, the absence of solvents and adhesives reduces the amount of material that makes up the raw material 1 of the film packaging, further reducing the environmental impact and making it easier to recycle. Moreover, with ultrasonic sealing, the sealing area 120a can be easily formed in the desired shape and position simply by changing the shape of the anvil roller. Furthermore, ultrasonic sealing allows for high-speed manufacturing of the raw material 1 compared to heat sealing methods that use hot plates.

[0036] Furthermore, since ultrasonic sealing does not use solvents to connect the heat-shrinkable films 101, it becomes possible to use heat-shrinkable films 101 made of materials that do not dissolve in solvents, thus expanding the freedom of selection of heat-shrinkable films 101 that can be used as raw material 1. Details of this ultrasonic sealing will be described later.

[0037] <Details of sealed and unsealed areas> Figure 4 is an explanatory diagram illustrating the formation positions of the sealed area 120a and the non-sealed area 120b in the overlapping portion 120. For the sake of explanation, Figure 4 shows the second opposing surface 101d of the heat-shrinkable film 101 in the overlapping portion 120, while the first opposing surface 101c (Figure 3) is omitted.

[0038] In the overlapping portion 120, multiple sealing regions 120a are formed, and the sealing regions 120a and non-sealing regions 120b are arranged alternately along the circumferential direction, as shown in Figure 4. Here, the circumferential direction is the direction in which the film packaging, which is cut from the raw material 1 to fit the container to be packaged, shrinks mainly when it is attached to the container. Here, since the film packaging cut from the raw material 1 is cylindrical, shrinkage of the film packaging occurs not only in the circumferential direction but also in the axial direction, but the axial shrinkage is slight, so the main direction of shrinkage is the circumferential direction. Thus, the film packaging is made of heat-shrinkable film 101, and it is the heat-shrinkable film 101 that actually shrinks, so from now on, the direction in which the film packaging shrinks will be described as the direction in which the heat-shrinkable film 101 shrinks (shrinkage direction).

[0039] It is preferable that the non-sealed region 120b in the overlapping portion 120 does not coincide with any shrinkage direction (circumferential or axial) of the heat-shrinkable film 101. To achieve this, a sealing region that breaks the continuity of the non-sealed region 120b in the shrinkage direction must exist in the shrinkage direction of the heat-shrinkable film 101.

[0040] Here, since the main direction in which the heat-shrinkable film 101 shrinks is the circumferential direction, it is preferable that the sealed region 120a and the non-sealed region 120b are arranged alternately along the circumferential direction indicated by the arrows in Figure 4.

[0041] In this way, by arranging a seal area 120a and a non-seal area 120b in the overlapping portion 120, the non-seal area 120b is not continuously formed from the second end 101b to the first end 101a in the circumferential direction. In other words, since a seal area 120a is always formed between the second end 101b and the first end 101a in the circumferential direction, the non-seal area 120b does not have a continuous shape in the direction that coincides with the direction in which the heat-shrinkable film 101 mainly shrinks (circumferential direction). This reduces the possibility of wrinkles forming in the heat-shrinkable film 101 when it shrinks, for example, when ultrasonic sealing of the overlapping portion 120 or when the heat-shrinkable film shrinks when packaging in a container. Furthermore, when the heat-shrinkable film 101 shrinks, the possibility of the seal area 120a peeling off due to the shrinkage of the non-seal area 120b is reduced.

[0042] If the energy during sealing of the heat-shrinkable film 101 is too high, the boundary between the sealed area 120a and the unsealed area 120b may become prone to tearing. This is known as edge tearing. If edge tearing occurs, and the sealed area 120a is continuous in the circumferential direction in the overlapping portion 120, the edge tear will propagate from the second end 101b to the first end 101a, causing a large tear and impairing the aesthetic appearance of the packaging. However, as shown in Figure 4, if the sealed area 120a is not formed continuously from the second end 101b to the first end 101a in the circumferential direction, even if edge tearing occurs at the boundary between the sealed area 120a and the unsealed area 120b, the resulting edge tear can be prevented from propagating from the second end 101b to the first end 101a. This suppresses the occurrence of tears that would significantly impair the aesthetic appearance of the packaging.

[0043] In the overlapping portion 120, the sealing regions 120a and non-sealing regions 120b are not only arranged alternately along the circumferential direction. That is, each sealing region 120a is formed in the same shape as the other sealing regions 120a, and the non-sealing regions 120b are formed in a roughly grid-like shape (shown by the dashed lines in the figure) by connecting the intervals between multiple sealing regions 120a, as shown in Figure 4. By forming the non-sealing regions 120b in a grid-like shape in this way, it becomes possible to reliably remove air between the heat-shrinkable film 101 and the container.

[0044] The sealing region 120a shown in Figure 4 is approximately circular in shape, but it is not limited to a circular shape as long as each region has the same shape. Furthermore, the shape of the sealing region 120a can be freely changed by changing the shape of the ambidextrous roller of the sealing device. If the shapes of the multiple sealing regions 120a are the same (circular), the force sealing the heat-shrinkable films 101 together can be made uniform and unbiased at the overlapping portion 120. This reduces the possibility of the sealing region 120a peeling off.

[0045] The shapes of the sealing areas 120a do not have to be the same, nor do their sizes have to be the same. For example, the shapes of the sealing areas 120a may be a mixture of squares and circles, and the sizes of the sealing areas 120a may be a mixture of large and small sizes.

[0046] <Explanation of ultrasonic sealing> Figure 5 is a schematic perspective view of the sealing device 201. Figure 6 is a schematic diagram of the anvil portion 240 of the sealing device 201 shown in Figure 5. Figure 7 is a schematic diagram of the projection portion 241 of the anvil portion 240. Figure 8 is an explanatory diagram of the ultrasonic seal.

[0047] As shown in Figure 5, the sealing device 201 sandwiches the overlapping portion 120 of the heat-shrinkable film 101 between the ultrasonic oscillating unit 210 and the anvil portion 240 on which a plurality of protrusions 241 are formed. Appropriate pressure is applied to the overlapping portion 120, and ultrasonic waves emitted by the ultrasonic oscillating unit 210 are transmitted to it. As a result, the overlapping portion 120 is sealed by heat welding the heat-shrinkable film 101 pieces together due to frictional heat.

[0048] Here, the overlapping portion 120 is not entirely sealed, but includes a sealed region 120a where the heat-shrinkable films 101 are sealed together, and an unsealed region 120b where the heat-shrinkable films 101 are not sealed together. In other words, the multiple protrusions 241 formed on the anvil portion 240 are in contact with the heat-shrinkable film 101 so that frictional heat is generated by the ultrasonic waves of the ultrasonic wave emitting portion 210 only in the portion forming the sealed region 120a.

[0049] As shown in Figure 6, the anvil portion 240 has multiple protrusions 241 formed on its surface 240a. As shown in Figure 7, each of the protrusions 241 is formed in the shape of a frustocone. However, the shape of the protrusions 241 is not limited to the shape shown in Figure 7; as long as the part facing the ultrasonic oscillator 210 is flat, it may be cylindrical, rectangular, or the like.

[0050] When sealing the overlapping portion 120 sandwiched between the ultrasonic oscillator 210 and the anvil portion 240, the overlapping portion 120 is set between the ultrasonic oscillator 210 and the anvil portion 240 as shown by reference numeral 1081 in Figure 8. At this time, the two heat-shrinkable films 101 in the set overlapping portion 120 are in a state where the first opposing surface 101c and the second opposing surface 101d are in close contact (not yet welded).

[0051] Next, a predetermined pressure is applied to the overlapping portion 120 by the ultrasonic oscillating unit 210 and the anvil portion 240, and ultrasonic vibrations are transmitted to the heat-shrinkable film 101 from the ultrasonic oscillating unit 210. As a result, frictional heat is generated in the region of the heat-shrinkable film 101 sandwiched between the ultrasonic oscillating unit 210 and the protrusion 241 due to the pressure and ultrasonic vibrations. This frictional heat causes the portions of the first opposing surface 101c and the second opposing surface 101d corresponding to the protrusion 241 to be heat-welded together. In this way, when ultrasonic treatment is performed, the portions of the first opposing surface 101c and the second opposing surface 101d corresponding to the protrusion 241 are melted and crushed by the frictional heat, so the crushed and protruding portions are not welded together and move towards the recessed side between the protrusions 241. As a result, as shown by reference numeral 1082 in Figure 8, in the overlapping portion 120, a sealed region 120a is formed where the first opposing surface 101c and the second opposing surface 101d are heat-welded together, and a non-sealed region 120b is formed where the first opposing surface 101c and the second opposing surface 101d are not heat-welded together.

[0052] In this way, ultrasonic sealing by the sealing device 201 applies appropriate pressure to the heat-shrinkable film 101 at the overlapping portion 120 while applying ultrasound. This causes the overlapping portion (contacting portion) of the heat-shrinkable film 101 to generate heat due to friction, and thermal welding is performed to form a sealed area 120a. The appropriate pressure and ultrasonic frequency in this case are not fixed values, but vary depending on conditions such as the material and thickness of the heat-shrinkable film 101.

[0053] Furthermore, as shown in Figure 6, in the anvil portion 240, the protrusions 241 are formed in such a way that the region where the protrusions 241 are not formed in the circumferential direction, i.e., the region corresponding to the non-sealed region 120b in the overlapping portion 120, is not continuous. By using an anvil portion 240 in which the protrusions 241 are formed in this way, the non-sealed region 120b in the overlapping portion 120 can be formed so that it does not extend in a direction that coincides with the direction in which the heat-shrinkable film 101 mainly shrinks (circumferential direction).

[0054] <Container packaging> Figure 9 is an explanatory diagram illustrating the packaging of a container using a film packaging 1A obtained from the raw material 1 shown in Figure 1. Figure 10 is a diagram illustrating the details of the overlapping portion of the film packaging 1A that has been heat-shrinked and attached to the container.

[0055] As shown in Figure 9, the film packaging 1A wraps the container 301, which is the object to be packaged. In other words, the container 301 is wrapped by the film packaging 1A. The film packaging 1A is obtained by cutting the raw material 1 shown in Figure 1 to the size corresponding to the container 301. The film packaging 1A functions as a product label by wrapping the film mounting surface 301a of the container 301. Therefore, by heat-shrinking the film packaging 1A while it is attached to the film mounting surface 301a of the container 301, a label molded body 3 with a product label attached to the container 301 can be formed.

[0056] As shown by reference numeral 1101 in Figure 10, the label molded body 3 has the film packaging 1A heat-shrinkable and attached to the outer surface of the container 301. In this state, the overlapping portion 120 of the film packaging 1A has a structure in which the first end 101a and the second end 101b of the heat-shrinkable film 101 are laminated on the container 301, as shown by reference numeral 1102 in Figure 10.

[0057] Before thermal shrinkage, the overlapping portion 120 has a sealed area 120a between the first opposing surface 101c and the second opposing surface 101d, as shown by reference numeral 1082 in Figure 8, and an unsealed area 120b. Then, upon thermal shrinkage, the space formed by the unsealed area 120b before thermal shrinkage disappears after thermal shrinkage, and the heat-shrinkable films 101 that were overlapped in the unsealed area 120b become airtightly laminated (as shown by reference numeral 1102 in Figure 10). As a result, the adhesive strength of the overlapping portion 120 is higher after thermal shrinkage than before thermal shrinkage.

[0058] Therefore, the label molded body 3 can ensure a good appearance of the heat-shrinkable film 101 itself by properly removing air between the heat-shrinkable film 101 and the container 301.

[0059] Furthermore, the object to be packaged by the film packaging 1A is not limited to the container 301, but can be any object that can be packaged by the heat-shrinkable film 101.

[0060] The anvil pattern in the overlapping portion 120 described above, which shows the shape and formation pattern of the sealing region 120a, is a pattern in which substantially circular sealing regions 120a are formed at predetermined intervals along the circumferential direction. In other words, the anvil pattern in the overlapping portion 120 is a pattern in which sealing regions 120a and non-sealing regions 120b are arranged alternately along the circumferential direction. However, the anvil pattern is not limited to the example of the overlapping portion 120, and the anvil patterns shown in the following modified examples 1 and 2 will also produce the same effect as the overlapping portion 120.

[0061] <Example 1> Figure 11 shows the anvil pattern in the overlapping portion 130. As shown in Figure 11, the overlapping portion 130 has multiple seal regions 130a formed therein, and each of the multiple seal regions 130a is formed in the shape of a linear strip extending in a direction intersecting the circumferential direction. In the gaps between adjacent seal regions 130a, non-seal regions 130b are formed in the shape of a linear strip extending in a direction intersecting the circumferential direction.

[0062] The seal region 130a and non-seal region 130b in the overlapping portion 130 are arranged alternately along the circumferential direction, similar to the seal region 120a and non-seal region 120b in the overlapping portion 120. In other words, it is preferable that the non-seal region 130b in the overlapping portion 130 does not coincide with any shrinkage direction (circumferential or axial) of the heat-shrinkable film 101. To achieve this, a seal region that breaks the continuity of the non-seal region 130b in the shrinkage direction must exist in the shrinkage direction of the heat-shrinkable film 101.

[0063] Here, since the heat-shrinkable film 101 primarily shrinks in the circumferential direction, the sealed region 130a and the non-sealed region 130b are arranged alternately along the circumferential direction indicated by the arrows in Figure 11. Therefore, in the overlapping portion 130, similar to the overlapping portion 120, the non-sealed region 130b has a shape that does not extend in the direction that coincides with the primarily shrinking direction (circumferential direction) of the heat-shrinkable film 101.

[0064] In the overlapping portion 130 shown in Figure 11, an example is shown where the width of the sealing region 130a is narrower than the width of the non-sealing region 130b, but this is not the only example. As long as the sealing function of the overlapping portion 130 is sufficient and sufficient air can escape during thermal shrinkage, the width of the sealing region 130a may be wider than the width of the non-sealing region 130b, or the widths of the sealing region 130a and the non-sealing region 130b may be the same.

[0065] Furthermore, as long as the sealing function is sufficient and sufficient air can escape during heat shrinkage, the spacing between adjacent sealing regions 130a may or may not be equal.

[0066] Furthermore, the number of sealing regions 130a formed is not particularly limited, as long as they function sufficiently as seals in the overlapping portion 130 and allow sufficient air to escape during thermal shrinkage. Also, the direction in which the sealing regions 130a are formed is not particularly limited, as long as it is in a direction intersecting the circumferential direction.

[0067] Furthermore, adjacent seal regions 130a do not have to be parallel to each other. In other words, the directions in which each seal region 130a is formed may be different. In this case, considering the escape of air in the overlapping portion 130, it is preferable that adjacent seal regions 130a are formed so that they do not intersect at both circumferential edges of the overlapping portion 130.

[0068] <Modification 2> Figure 12 shows the anvil pattern in the overlapping portion 140. As shown in Figure 12, the overlapping portion 140 has multiple first seal regions 140a and multiple second seal regions 140b, and each of the first seal region 140a and the second seal region 140b is formed in a linear shape extending in a direction perpendicular to the circumferential direction. The first seal region 140a and the second seal region 140b are adjacent in the circumferential direction, and the positions of both ends of the first seal region 140a in the direction perpendicular to the circumferential direction are different in the direction perpendicular to the circumferential direction from the positions of both ends of the second seal region 140b adjacent to the first seal region 140a in the direction perpendicular to the circumferential direction. It is preferable that the first end 101a of the heat-shrinkable film 101 in the overlapping portion 140 is sealed intermittently. This is because the first end 101a does not rise after shrinkage. Therefore, in Figure 12, the second sealing region 140b is intermittently formed at a position corresponding to the first end 101a of the heat-shrinkable film 101 in the overlapping portion 140 (right side of Figure 12). If the arrangement of the first sealing region 140a and the second sealing region 140b is reversed from that in Figure 12, the first sealing region 140a is intermittently formed at a position corresponding to the first end 101a of the heat-shrinkable film 101 in the overlapping portion 140.

[0069] The first seal region 140a, the second seal region 140b, and the non-seal region 140c in the overlapping portion 140 are arranged alternately along the circumferential direction, similar to the seal region 120a and non-seal region 120b in the overlapping portion 120. In other words, it is preferable that the non-seal region 140c in the overlapping portion 140 does not coincide with any shrinkage direction (circumferential or axial) of the heat-shrinkable film 101. To achieve this, a seal region that breaks the continuity of the non-seal region 140c in the shrinkage direction must exist in the shrinkage direction of the heat-shrinkable film 101.

[0070] Here, since the main direction in which the heat-shrinkable film 101 shrinks is the circumferential direction, the first seal region 140a and the non-seal region 140c, and the second seal region 140b and the non-seal region 140c are arranged alternately along the circumferential direction indicated by the arrows in Figure 12. Therefore, in the overlapping portion 140, similar to the overlapping portion 120, the non-seal region 140c has a shape that does not extend in the direction that coincides with the main direction (circumferential direction) in which the heat-shrinkable film 101 shrinks.

[0071] In the overlapping portion 140 shown in Figure 12, the first sealing region 140a and the second sealing region 140b are approximately the same shape, but this is not limited to this. For example, the width of the first sealing region 140a may be wider or narrower than the width of the second sealing region 140b. Also, the length of the first sealing region 140a may be longer or shorter than the length of the second sealing region 140b. Furthermore, the sizes of the first sealing regions 140a and the second sealing regions 140b do not need to be the same. The width and length of the first sealing region 140a and the second sealing region 140b can be any width and length as long as they provide sufficient sealing function in the overlapping portion 140 and allow sufficient air to escape during thermal shrinkage.

[0072] Furthermore, the number of first sealing regions 140a and second sealing regions 140b is not particularly limited, as long as they function sufficiently as a seal in the overlapping portion 140 and allow sufficient air to escape during thermal shrinkage.

[0073] The present invention is not limited to the embodiments described above, and various modifications are possible within the scope of the claims. Embodiments obtained by appropriately combining the technical means disclosed in different embodiments are also included in the technical scope of the present invention. [Explanation of Symbols]

[0074] 1 Original fabric 1A Film packaging 3 Label molded body 101 Heat Shrinkable Film 101a First end 101b Second end 101c 1st facing surface 101d Second facing surface 102 Inner end 103 Outer edge 120, 130, 140 overlapping section 120a, 130a sealing area 120b, 130b, 140c Non-sealed areas 140a First seal area 140b Second seal area 201 Sealing device 210 Ultrasonic Oscillator 240 Anvil Section 301 Container

Claims

1. A roll of heat-shrinkable film in which the ends are overlapped at the overlapping portion to form a tubular shape, and which is cut to the size of the container to be packaged to obtain multiple film packaging bodies, The overlapping portion of the aforementioned heat-shrinkable film is The heat-shrinkable films include a non-sealed region where the films are not sealed to each other, and a sealed region where the films are sealed to each other. The non-sealed region is in communication with the outside of the roll of material in the overlapping portion. A raw material in which the sealed areas and the unsealed areas are alternately arranged along the circumferential direction when the film packaging is attached to a product.

2. Multiple sealing regions are formed in the aforementioned overlapping portion. The raw material according to claim 1, wherein the non-sealed regions are formed in a substantially grid pattern by connecting the intervals between the plurality of sealed regions.

3. The raw material according to claim 2, wherein each of the plurality of sealing regions is formed in the same shape as the other sealing regions.

4. The raw material according to any one of claims 1 to 3, wherein the sealing region is ultrasonically sealed.

5. A film packaging body obtained by cutting the raw material described in claim 1 to the size of the container to be packaged.

6. A container packaged by the film packaging described in claim 5.

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