Perforated shrink film, package using perforated shrink film, packaging device, perforated shrink film manufacturing method, and packaging method using perforated shrink film

Abstract

The present invention is a perforated shrink film (100) in which a large number of holes (110) are provided in a shrink film material, and bridges (120) are provided between the holes (110). By using this perforated shrink film, it is possible to enable stable packing using a small amount of packing resources when packaging an article to be packaged. The holes (110) are, for example, regularly or irregularly perforated short linear or short thick linear holes, regular or irregular holes having a mesh-like polygonal shape, or regularly or irregularly perforated circular, ellipsoidal, or arc-shaped holes. The form in which the perforated shrink film is supplied is: a rolled body in which the perforated shrink film is continuously wound in a roll shape; and is a zigzag folding of a single-leaf flat sheet or a plurality of leaves, with the perforated shrink film being supplied for every leaf.

Description

Perforated shrink film, packaging using perforated shrink film, packaging device, method for manufacturing perforated shrink film, and packaging method using perforated shrink film

[0001] The present invention relates to shrink-wrap packaging technology and packaging equipment using shrink film. Conventional shrink films have the property of shrinking when heat is applied. Their outer shape is a uniform, flat film similar to thin film wrap. The shrink film of the present invention has a unique outer shape.

[0002] Thick cardboard boxes, such as cardboard boxes, are commonly used for packaging products. However, cardboard boxes often have standardized shapes and sizes, which do not necessarily match the size of the packaged items placed inside, resulting in the problem of the packaged items moving around inside the cardboard box. For this reason, packaging has been unavoidable, with the cardboard box being filled with bubble wrap containing many air bubbles as cushioning material, or with the packaged items being surrounded by polystyrene foam.

[0003] Furthermore, product packaging known as blisters has been widely used to package products manufactured and sold in large quantities. Blisters are three-dimensional plastic containers with a cavity that roughly matches the outer shape of the product to be packaged. After the product is filled into the cavity, the opening is sealed with a backing card or the like to complete the packaging. However, with environmental issues coming to the forefront in recent years, the use of such plastic packaging has come to be seen as problematic, and there is a strong demand for packaging that produces less waste.

[0004] As mentioned above, cardboard box packaging and blister product packaging have many problems and their sustainable use into the future is difficult, so shrink film packaging technology is becoming increasingly important.

[0005] A known prior art shrink film packaging technique is disclosed in Japanese Patent Laid-Open No. 2011-157116 (Patent Document 1). FIG. 15 is a diagram showing the prior art shrink film packaging disclosed in Japanese Patent Laid-Open No. 2011-157116. As shown in FIG. 15(a), the shrink film 121 is configured to span the same width as the opening 111. Ends 122a and 122b of the shrink film 121 are firmly attached to the lid portions 112a and 112b. After placing the packaged item on the spanning shrink film 121, the lid portions 112a, 112b, 113a, and 113b are folded in place to close the opening 111. In this state, the packaged item is suspended in the cardboard packaging box 110 by the shrink film 121, with a large amount of play, but is held in place by the space between the shrink film 121 and the four lids covering the opening 111 within the cardboard packaging box 110. If the shrink film 121 is shrunk by applying heat to the entire cardboard packaging box 110, the volume of the space between the shrink film 121 and the four lids covering the opening 111 is reduced, and the play in the space between the packaged item, the shrink film 121, and the four lids becomes smaller, allowing the package to be packed in a stable state. Note that instead of dangling the item in the air, there is also a method of turning the cardboard packaging box 110 upside down and fixing the shrink film 121 to the inner bottom surface to enclose the packaged item, as shown in Figure 15(b), where heat is applied to the entire cardboard packaging box 110 to shrink the shrink film 121 and pack the item.

[0006] Next, a known prior art shrink film packaging technique is disclosed in Japanese Patent Laid-Open Publication No. 2004-231230 (Patent Document 2). FIG. 16 is a diagram showing the prior art shrink film packaging technique disclosed in Japanese Patent Laid-Open Publication No. 2004-231230. As shown in FIG. 16, a shrink film sheet 2 is set in a predetermined position on a backing sheet 6, either manually or automatically. Next, an item 4 (in this example, a book) is placed on the shrink film sheet 2, either manually or automatically. In this example, the item 4 is set in a position that overlaps the backing sheet 6 but does not protrude beyond the backing sheet. Next, a pair of fold-back portions protruding on both sides of the backing sheet 6 are folded back from both sides, either manually or automatically, and placed on the item 4. An identification label is then attached, either manually or automatically, and the shrink film is then shrunk by applying heat in a shrink packaging machine, resulting in packaging. The volume of the space between the shrink film 2 and the packaged item 4 is reduced, and the play is reduced, allowing the package to be packed in a stable state.

[0007] JP 2011-157116 A JP 2004-231230 A

[0008] The above-mentioned conventional technologies have problems. In both the shrink film packaging technology of Figure 15 and the shrink film packaging technology of Figure 16, if the packaged item is flat or even a three-dimensional packaged item that is flat, such as a rectangular parallelepiped, the gap between the shrink film and the packaged item is a gap between two opposing flat surfaces. In other words, if the shrink film is flat and the opposing surface of the packaged item is also flat, the gap between the two surfaces is a gap between two opposing flat surfaces. When heat is applied to shrink the shrink film in this state, the surface of the shrink film approaches the surface of the packaged item, conforming to the surface, thereby reducing the volume. In other words, the above-mentioned conventional shrink film packaging technology can be applied without any problems to flat packaged items or three-dimensional packaged items that are flat, such as a rectangular parallelepiped.

[0009] However, the outer shape of the packaged item is not limited to the flat shape described above. For example, if the packaged item has sharp protrusions or acute-angled convex shapes on its surface, wrapping it in a flat shrink film could result in the sharp protrusions or acute-angled convex shapes piercing and damaging the shrink film, causing tears or partial ruptures. If the shrink film is ripped or torn, when the shrink film is subsequently shrunk during the heat application process, the tears or ruptures could trigger further cracks and ruptures, resulting in an incomplete package.

[0010] In recent years, there has been an increase in the variety of designs for packaged items, including those with sharp protrusions or acutely angled convex shapes on the surface. Furthermore, instead of mass production, there has been an increase in small-lot production of a wide variety of products, creating a demand for shrink film packaging technology that enables optimal packaging. Furthermore, with the demand for packaging that emphasizes the SDGs in recent years, many customers are concerned about the conditions of distribution and delivery, so a major challenge has been finding a way to package items stably using as little packaging material as possible.

[0011] In view of the above problems, the present invention aims to provide a specially processed shrink film that can stably package items of any shape using a small amount of packaging material, and a packaging device that uses the shrink film.

[0012] In order to solve the above problems, the present invention has the following configuration. Note that the components described below can be employed in any combination possible. It should be understood that the aspects and technical features of the present invention are not limited to those described below, but are recognized based on the inventive idea described in the entire specification and drawings, or that can be grasped by a person skilled in the art from those descriptions.

[0013] The perforated shrink film specially processed for packaging materials according to the present invention is a shrink film having a large number of holes perforated therein. Generally, shrink films are uniformly flat, and even if a notch or slit is present on a portion of the edge, it merely forms part of the edge's contour, and even if one or two holes are present around the periphery, they are merely locking holes on the edge. The perforated shrink film according to the present invention is a perforated shrink film having a large number of holes perforated therein. Here, the large number of holes may include a large number of short or short thick line-shaped slits, a large number of polygonal openings, a large number of circular or elliptical openings, or a large number of arc-shaped slits. In the present invention, the perforated shrink film refers to a shrink film having a large number of such openings or slits perforated in the main area of ​​the shrink film that encloses the packaged item. In other words, the area in which the multiple apertures or slits of the perforated shrink film of the present invention are formed can extend to the central region of the shrink film material, i.e., the main area surrounding the packaged item. Since multiple apertures or slits are formed in the central area of ​​the shrink film surface, rather than one or two holes in the edge slits or peripheral areas, multiple bridges are formed between the holes in the area surrounding the packaged item. Since the multiple apertures or slits are formed regularly or irregularly, multiple bridges are formed regularly or irregularly, resulting in a complex, continuous network of multiple bridges. In other words, the perforated shrink film can have a nested or mesh-like structure in which multiple bridges are intricately intertwined.

[0014] With the above configuration, even if the surface of the packaged item has sharp protrusions or acute-angled convex shapes, the adverse effects of these protrusions penetrating the holes and protruding upward can be mitigated, thereby damaging or tearing the shrink film. Furthermore, even if a protrusion damages or tears some of the holes, breaking a bridge, the remaining adjacent bridges remain independent, preventing the tear from propagating and limiting the impact of the break to a small area. With conventional uniform, flat shrink film, a tear in one location propagates to the surrounding areas. The perforated shrink film of the present invention avoids this problem. Furthermore, while perforated shrink film shrinks when heat is applied, the perforated shrink film of the present invention shrinks each of the numerous bridges individually, resulting in a complex, intertwined, nested, or mesh-like structure that shrinks and reduces in diameter overall, allowing the shrink wrap to conform to the surface shape of any packaged item.

[0015] The perforated shrink film of the present invention can be supplied in at least two ways: For example, the perforated shrink film may be supplied in a continuous roll from which the desired length can be unwound; or, for example, the perforated shrink film may be supplied as a single flat sheet or as a multi-sheet zigzag sheet, which can be supplied individually.

[0016] Here, the perforations in the perforated shrink film of the present invention can have multiple patterns. For example, the perforations can be short or thick line-shaped slits, with numerous short or thick line-shaped slits arranged regularly or irregularly. If the perforations are small dots, bridges are less likely to form between the holes, and the length of the bridges is short. However, if numerous short or thick line-shaped slits are provided, bridges are more likely to form between the short or thick line-shaped slits. As described above, the bridges are independent even when connected, and the impact of breakage can be limited to a small area. The size of the short or thick line-shaped slits can range from a few millimeters to a few centimeters on the long side. The number of holes is not limited, but there can be anywhere from a dozen to several hundred within the area surrounding the packaged item. These are just examples, and numerical ranges may be exceeded.

[0017] In addition, for example, the holes may be polygonal openings, with many polygonal openings being regularly or irregularly arranged to form a mesh. A mesh-like structure creates a more clearly defined bridge, minimizing the impact of breakage. Furthermore, the bridge itself is longer, functioning as a so-called long-mesh net, increasing the margin for bridge shrinkage due to heat application, allowing for more appropriate wrapping and packaging of packaged items of various shapes. The size of the holes may range from a few millimeters to a few centimeters, and the number of holes is not limited, but there may be anywhere from a dozen to several hundred holes within the area surrounding the packaged item. These are just examples, and numbers beyond these ranges may also be acceptable.

[0018] Also, for example, the slits forming the holes may be circular or elliptical opening holes or arc-shaped slits, and there may be a large number of circular or elliptical opening holes or arc-shaped slits drilled regularly or irregularly. In this case, the bridge itself tends to be thicker, but a mesh-like effect can be obtained, and the impact of breakage can be limited to a small area. The size of the holes may be several millimeters to several centimeters, and the number of holes is not limited, but there may be a dozen to several hundred holes in the area surrounding the packaged item. These are just examples, and there may be cases where the numerical range is exceeded.

[0019] Next, the present invention also provides a package, which is the result of packaging, that is, a novel product not found in the prior art. The present invention also covers a package packaged using the perforated shrink film of the present invention. For example, the package may be a package in which the perforated shrink film of the present invention is attached to a sheet-like backing board, and the packaged item is placed between the backing board and the perforated shrink film, and then shrink-wrapped. Furthermore, the present invention may be a package in which the perforated shrink film is attached to the inner bottom, top, or inner peripheral wall of a transport box, and then shrink-wrapped, and then the packaged item is placed between the inner bottom, top, or inner peripheral wall of the box and the perforated shrink film.

[0020] Next, the present invention also relates to a packaging device that automatically packages items to be packaged using the perforated shrink film of the present invention. The packaging device of the present invention has at least two configurations. In the first configuration, the double-sided tape to be used is first attached to a backing sheet, and then the perforated shrink film of the present invention is placed and adhered to the double-sided tape. The packaging device of the present invention in the first configuration includes a backing sheet supply unit that supplies the backing sheet, a double-sided tape application unit that applies the double-sided tape to a predetermined position on the backing sheet supplied from the backing sheet supply unit, an item transfer unit that places the packaged item on the backing sheet, a perforated shrink film supply unit that supplies the perforated shrink film of the present invention, a covering and fixing unit that uses the perforated shrink film to cover the packaged item placed on the backing sheet and place it on the double-sided tape to fix the periphery of the perforated shrink film, and a shrink device that shrinks the perforated shrink film by applying heat to shrink the perforated shrink film to shrink-wrap the packaged item. According to the packaging device of the present invention having the first device configuration, if the double-sided tape can be attached at the position determined by the double-sided tape attachment section, the positional relationship between the perforated shrink film, backing paper, and packaged item can be appropriately controlled and attached.

[0021] In a second configuration, the adhesive to be used is first applied to a backing sheet, and then the perforated shrink film of the present invention is placed and attached to the adhesive-applied area. The packaging device of the present invention in this second configuration includes a backing sheet supply unit that supplies backing sheets, an adhesive application unit that applies adhesive to a predetermined position on the backing sheet supplied from the backing sheet supply unit, an item transfer unit that places an item to be packaged on the backing sheet, a perforated shrink film supply unit that supplies the perforated shrink film of the present invention, a covering and fixing unit that uses the perforated shrink film to cover the item to be packaged placed on the backing sheet and place it on the adhesive, thereby fixing the periphery of the perforated shrink film, and a shrink device that shrinks the perforated shrink film by applying heat to shrink the packaged item. The packaging device of the present invention in this second configuration can package the item by first applying adhesive in the adhesive application unit, then attaching the perforated shrink film to the adhesive, and then applying heat.

[0022] The double-sided tape used in the double-sided tape application section of the packaging device of the present invention can be selected so that the adhesive on one side can adhere to the shrink film material and the adhesive on the other side can adhere to the surface of the backing paper, ensuring good adhesion. While no adhesive is known that can effectively bond both shrink film material and paper material at the same time, double-sided tape can be selected that has adhesives suitable for each on the front and back. While the packaging device of the present invention relating to the second device configuration of the present invention assumes the use of adhesive, if an adhesive that can effectively bond both shrink film material and paper material at the same time is developed in the near future, it can be used.

[0023] Next, the present invention also relates to a packaging method for automatically packaging an item to be packaged using the perforated shrink film of the present invention. The packaging method of the present invention includes at least the following two methods. In the first packaging method, the double-sided tape to be used is first attached to a backing sheet, and then the perforated shrink film of the present invention is placed and adhered to the double-sided tape. The first packaging method using the perforated shrink film of the present invention is characterized by comprising a backing sheet supplying step for supplying a backing sheet, a double-sided tape applying step for applying double-sided tape to a predetermined position on the backing sheet supplied in the backing sheet supplying step, an item transfer step for placing the item to be packaged on the backing sheet, a perforated shrink film supplying step for supplying the perforated shrink film of the present invention, a covering and fixing step for using the perforated shrink film to cover the item to be packaged placed on the backing sheet and then placing the item on the double-sided tape to fix the periphery of the perforated shrink film, and a shrinking step for shrinking the perforated shrink film by applying heat to shrink the perforated shrink film and shrink-wrap the item to be packaged.

[0024] The second packaging method is a packaging method in which the adhesive to be used is first applied to a backing sheet, and then the perforated shrink film of the present invention is placed and adhered to the adhesive surface. The second packaging method using the perforated shrink film of the present invention is characterized by comprising a backing sheet supplying step of supplying a backing sheet, a packaged item transfer step of placing an item to be packaged on the backing sheet, an adhesive application step of applying adhesive to a predetermined position between the surface of the backing sheet and the perforated shrink film, a perforated shrink film supplying step of supplying the perforated shrink film of the present invention, a covering step of using the perforated shrink film to cover the item to be packaged placed on the backing sheet and fixing it with an adhesive, and a shrinking step of shrinking the perforated shrink film by applying heat to shrink the perforated shrink film to shrink-wrap the item to be packaged.

[0025] The present invention also relates to a method for manufacturing the perforated shrink film itself. The method for manufacturing the perforated shrink film of the present invention comprises a shrink film supplying step of supplying a shrink film, a release sheet forming step of applying a release sheet coated with a release agent to the back surface of the supplied shrink film to form a two-layer structure, a slit forming step of forming holes in at least one layer of the shrink film or in two layers consisting of the shrink film layer and the release sheet layer using a Thomson blade having a blade shape corresponding to the slit that forms the hole, and a peeling step of peeling the release sheet layer from the shrink film layer.

[0026] The above manufacturing method includes at least two methods, depending on the method for supplying the shrink film material. In the first method, the shrink film material supplied in the shrink film supplying step of the above manufacturing method is a continuous roll, the release sheet supplied in the release sheet forming step is a continuous roll, the Thomson blade used in the slit forming step is attached to the surface of a rotating body, and the holes are formed continuously in the slit forming step by the continuous rotation of the rotating body. If the shrink film material is a continuous roll, perforated shrink films can be produced one after another.

[0027] In a second manufacturing method, the shrink film material supplied in the shrink film supplying step is a single flat sheet or a compound zigzag fold, the release sheet supplied in the release sheet forming step is a single flat sheet or a compound zigzag fold, the Thomson blade used in the slit forming step is provided on the surface of a flat plate, and the holes are formed in the single sheet or compound zigzag fold by the Thomson blade on the flat plate in the slit forming step. If the shrink film material is a single flat sheet or a compound zigzag fold, perforated shrink film can be manufactured sheet by sheet.

[0028] With the perforated shrink film of the present invention, even if the surface of the packaged item has sharp protrusions or acute-angled convex shapes, the negative effects of these protrusions penetrating the holes and protruding upward can be mitigated, thereby damaging or tearing the shrink film. Furthermore, even if a protrusion damages and tears some of the holes, breaking a bridge, the remaining adjacent bridges remain independent. While the tear would propagate in a flat shrink film, the perforated shrink film of the present invention prevents the tear from propagating, and the effects of the break are limited to a small area. Using the perforated shrink film of the present invention, a good package can be obtained. A packaging device capable of automatically packaging the packaged item can be provided using the perforated shrink film of the present invention. Because a method for producing the perforated shrink film of the present invention has been established, a large number of perforated shrink films can be steadily supplied to the market.

[0029] 1 is a diagram showing a simplified configuration of a perforated shrink film 100a according to a first pattern of the present invention; FIG. 2 is a diagram showing a simplified configuration of a perforated shrink film 100b according to a second pattern of the present invention; FIG. 3 is a diagram showing a simplified configuration of another perforated shrink film 100c according to a second pattern of the present invention; FIG. 4 is a diagram showing an example in which the perforated shrink film 100 is provided in the form of being unwound from a roll 130 wound continuously in a roll shape; FIG. 5 is a diagram showing an example in which the perforated shrink film 100 is supplied as a single flat sheet; FIG. 6 is a diagram showing an example configuration of a first packaging device 400a according to the present invention; FIG. 7 is a diagram showing a simplified configuration of a double-sided tape application device 420a; FIG. 8 is a diagram showing a simplified pattern 1 of the application operation of the double-sided tape application device 420a; FIG. 9 is a diagram showing a state in which a half-cut double-sided tape 510 is applied to a target application location using the double-sided tape application device 420a and then separated; FIG. 10 is a diagram showing an example of application marks left by controlling the application direction of the strip-shaped half-cut double-sided tape 510 in accordance with the movement of the double-sided tape application device 420; FIG. 1 is a diagram simply showing pattern 2 of the application operation of the double-sided tape application device 420a. FIG. 2 is a diagram showing the flow of each process by the first packaging device 400a of the present invention. FIG. 3 is a diagram simply showing the configuration of the second packaging device 400b of the present invention. FIG. 4 is a diagram showing an example of a package in which an object to be packaged is directly packaged on the inner bottom surface of a transport box using the perforated shrink film 100 of the present invention by the first packaging device 400 of the present invention. FIG. 5 is a diagram showing shrink film packaging of the prior art disclosed in Japanese Patent Application Laid-Open No. 2011-157116. FIG. 6 is a diagram showing shrink film packaging in the prior art disclosed in Japanese Patent Application Laid-Open No. 2004-231230.

[0030] The perforated shrink film of the present invention will be described below with reference to the drawings. However, it goes without saying that the scope of the present invention is not limited to the following examples. In Example 1, the perforated shrink film 100 of the present invention and a package shrink-wrapped with the perforated shrink film 100 of the present invention will be described. In Example 2, a packaging device that packages an item using the perforated shrink film 100 of the present invention will be described. In Example 3, a perforated shrink film manufacturing device that manufactures the perforated shrink film 100 will be described.

[0031] A perforated shrink film according to Example 1 of the present invention will be described. The perforated shrink film 100 according to the present invention is not limited to a specific hole shape or regular or irregular arrangement, and various patterns are possible. A representative example is shown here. FIG. 1 is a simplified diagram illustrating the configuration of a perforated shrink film 100a according to a first pattern. The holes are short, thick lines, and this example shows a structure in which numerous short, thick lines are regularly arranged. While the perforated shrink film 100 is often made of a transparent material, the bridge 120a shown here is hatched to make the shrink film material easier to see. The shrink film material does not necessarily have to be transparent; it can also be colored. As shown in FIG. 1(a), numerous short, thick lines 110a are perforated, and the area of ​​the shrink film material between the short, thick lines 110a is defined as the bridge 120a. Numerous short, thick line segments 110a are also provided in the central region of the perforated shrink film 100, and are not simply provided on a portion of the edge, but rather numerous holes are provided in the central portion where the packaged item is packaged. As shown in FIG. 1(b), the perforated shrink film 100a shown in FIG. 1(a) changes its shape when heat is applied, causing the bridges 120a to shrink. In other words, in FIG. 1(b), the bridges 120a are regularly arranged in one direction, so the perforated shrink film 100a as a whole shrinks in one direction. FIG. 1(c) shows an example of a package using the perforated shrink film 100a shown in FIG. 1(a). The package is an example in which the perforated shrink film 100a is attached to a sheet-like backing, and the packaged item 300 is placed between the backing 200 and the perforated shrink film 100a, and then shrink-wrapped. As shown in Figure 1(c), the packaged item 300 is placed on the backing sheet 200, double-sided tape 510 is attached to predetermined locations around the packaged item 300, and the edges of perforated shrink film 100a are attached and fixed to the backing sheet 200. Heat is then applied to the unpackaged package to shrink the shrink film material and complete the packaging.In this example, since each bridge section 120a is relatively short and thick, the packaged item 300 suitable for the perforated shrink film 100a, which has many short, thick line segments 110a regularly perforated, is often one that is short, has a flat shape without large irregularities, and is suitable for the perforated shrink film 100a.

[0032] While Figure 1 shows an example in which numerous short, thick lines are regularly perforated, the perforated shrink film 100a of the present invention may have numerous short, thick lines 110a irregularly perforated when the holes 110 are numerous short, thick lines 110a. If numerous short, thick lines 110a are irregularly perforated, the bridges 120a, which are the areas of shrink film material between the short, thick lines 110a, can also be considered to be irregularly arranged with no directionality. If the bridges 120a are irregularly arranged with no directionality, the direction in which the bridges 120a shrink will change when heat is applied to the perforated shrink film 100a. Therefore, if numerous short, thick lines 110a are irregularly perforated, the shrink direction will be averaged overall, and the perforated shrink film 100a as a whole will shrink from all directions toward the center.

[0033] FIG. 2 is a simplified diagram illustrating the configuration of a perforated shrink film 100b according to the second pattern. The perforations are polygonal holes 110b, and in this example, numerous polygonal holes 110b are regularly arranged. In this example, the polygonal holes 110b are square holes. Here, bridges 120b are hatched to make the shrink film material easier to see. Note that the shrink film material does not necessarily have to be transparent; it can also be colored. As shown in FIG. 2(a), numerous square holes 110b are perforated, and the areas of the shrink film material between the square holes 110b are positioned as bridges 120b. Overall, this example shows the bridges 120b formed in a mesh-like pattern. Numerous polygonal holes 110b are also provided in the central region of the perforated shrink film 100, not simply along the edges, but in the central portion where the packaged item is packaged. As shown in Figure 2(b), when heat is applied to the perforated shrink film 100b shown in Figure 2(a), the bridges 120b change in the direction of shrinkage. In other words, although the bridges 120b in Figure 2(b) are regular, they are mesh-like and therefore uniform in all directions when viewed macroscopically, and the perforated shrink film 100b as a whole shrinks toward the center.

[0034] Figure 2(c) shows the completed package, in which the packaged item 300 is placed on the backing sheet 200, double-sided tape 510 is attached to the periphery of the packaged item 300, and the edges of the perforated shrink film 100b are attached and secured to the backing sheet 200. Heat is then applied to the unwrapped package, causing the shrink film material to shrink and complete the package. In this example, the perforated shrink film 100b expands as a whole due to the presence of the packaged item 300 before heat application, but shrinks toward the center upon heat application. During this process, the mesh-like bridge 120b tightens around the outer shape of the packaged item 300, forming a tightly wrapped package. In other words, the package is held in place by the mesh-like strings with moderate tension from multiple directions.

[0035] The polygonal holes 110 may have other polygonal shapes. For example, FIG. 3( a) shows an example in which the polygonal holes 110c are hexagonal holes 110c. As shown in FIG. 3( a), the perforated shrink film 100c has numerous hexagonal holes 110c. The areas of the shrink film material between the hexagonal holes 110c are positioned as bridges 120c, and the bridges 120c form a honeycomb structure. If the hexagonal holes 110c are evenly and regularly arranged, a uniform honeycomb structure is obtained from a macroscopic perspective, and the perforated shrink film 100c as a whole shrinks toward the center. In the example of FIG. 3( a), numerous hexagonal holes 110c are also provided in the central region of the perforated shrink film 100, and are not simply provided at a portion of the edges, but rather numerous holes are provided in the central portion where the packaged item is packaged. There may also be an example in which a large number of polygonal holes 110 are irregularly formed. For example, the holes 110 may be a combination of various shapes such as squares, pentagons, and hexagons. In this case, the bridge portions 120 are formed in an irregular nested shape as a whole. Even if the bridges 120 are irregularly arranged in a nested shape, as long as they are appropriately distributed in all directions from a macroscopic perspective, the perforated shrink film 100 as a whole will shrink toward the center.

[0036] Although not shown, the perforated shrink film 100c shown in Fig. 3(a) with hexagonal holes 110c can be used in the same manner as in the case of the square holes 110b shown in Fig. 2(c) by placing the packaged item 300 on a backing sheet 200, attaching double-sided tape 510 to predetermined locations around the packaged item 300, and then attaching the edges of the perforated shrink film 100 with multiple hexagonal holes 110 to the backing sheet 200, and then applying heat to the unwrapped package to shrink the shrink film material, thereby producing a package. In the example of the perforated shrink film 100c with hexagonal holes 110c and the bridge 120 being a honeycomb structure, similar to Fig. 2(c), even though the perforated shrink film 100c as a whole expands due to the presence of the packaged item 300 before heat application, it shrinks toward the center when heat is applied. During this process, the honeycomb-structured bridge 120 of the packaged item 300 is tightened along the outer shape of the packaged item 300, forming a tightly wrapped package. In other words, the packaged item is held in place by the mesh-like strings with moderate tension from multiple directions.

[0037] Representative examples of other patterns are also shown. Figure 3(b) shows an example of a perforated shrink film 100d with circular holes 110d. This example shows numerous circular holes 110d regularly arranged. Here, the bridges 120d are hatched to make the shrink film material easier to see. The shrink film material does not necessarily have to be transparent; it can also be colored. As shown in Figure 3(b), numerous circular holes 110d are perforated, and the areas of the shrink film material between the circular holes 110d are positioned as bridges 120d. The bridges 120d are curved arcs connecting portions of the circumference. The arc shape provides a smooth, continuous edge, which is advantageous for packaging the packaged item. In the example of Figure 3(b), numerous circular holes 110d are also provided in the central region of the perforated shrink film 100, meaning that numerous holes are perforated not just along the edges, but in the central portion where the packaged item is packaged. When heat is applied to the perforated shrink film 100d, the bridges 120d change in the direction of contraction. In other words, in Figure 3(b), the bridges 120d are regular and uniform in all directions when viewed macroscopically, and the perforated shrink film 100d as a whole shrinks toward the center. While the package is not shown, the packaged item 300 is placed on a backing sheet 200, double-sided tape 510 is attached to predetermined locations around the perforated shrink film 300, and the edges of the perforated shrink film 100d are attached and fixed to the backing sheet 200. Heat is then applied to the unpackaged package to shrink the shrink film material, completing the package. Note that while the example in Figure 3(b) shows circular holes 110c arranged regularly, irregular perforations are also acceptable.

[0038] Next, Figure 3(c) shows an example in which multiple elliptical holes 110e are perforated. Here, the bridges 120e are hatched to make the shrink film material easier to see. The shrink film material does not necessarily have to be transparent; it can also be colored. As shown in Figure 3(c), multiple elliptical holes 110e are perforated, and the areas of the shrink film material between the circular holes 110e are positioned as bridges 120e. The bridges 120e are curved arcs that connect portions of the ellipse. The arc shape provides a smooth, continuous edge, which is advantageous for packaging the packaged item. In the example of Figure 3(c), multiple elliptical holes 110d are also perforated in the central area of ​​the perforated shrink film 100. Instead of simply perforating the edges, multiple holes are perforated in the central portion where the packaged item is wrapped. When heat is applied to the perforated shrink film 100e, the bridges 120e change in the direction of shrinkage. In other words, in Figure 3(c), the bridges 120e are regular and uniform in all directions when viewed macroscopically, and the perforated shrink film 100e as a whole shrinks toward the center. While the package is not shown, the packaged item 300 is placed on the backing sheet 200, double-sided tape 510 is attached to predetermined locations around the packaged item 300, and the edges of the perforated shrink film 100e are attached and fixed to the backing sheet 200. Heat is then applied to the unpackaged package to shrink the shrink film material, completing the package. Note that while the example in Figure 3(c) shows oval holes 110e arranged regularly, they may also be arranged irregularly. Other shapes of holes 110 other than those shown in Figure 3 are also possible.

[0039] Next, the supply form of the perforated shrink film 100 will be described. There are various possible supply forms for the perforated shrink film 100, but two supply forms will be described here. FIG. 4 shows an example in which the perforated shrink film 100 is provided in a form unwound from a continuous roll 130. By supplying a continuous perforated shrink film 100 wound in a roll form around the roll 130, the perforated shrink film 100 can be unwound from the roll 130, and the desired length can be measured by rotating the shaft 131 of the roll 130. After unwound, the measured length must be cut into individual sheets using a cutter (not shown). Once unwound, the film is used as packaging material.

[0040] Figure 5 shows an example in which perforated shrink film 100 is supplied as a single flat sheet. This is an example in which perforated shrink film 100 is supplied one sheet at a time from a feeder 140. A large number of single flat sheets of perforated shrink film 100 are stacked in the feeder 140, and are supplied one sheet at a time by a conveying system (not shown). Since they are already separated into single sheets, they can be used as packaging material. Single sheets of perforated shrink film 100 supplied in the supply configurations shown in Figures 4 and 5 can be used as packaging material.

[0041] As a second embodiment, a packaging apparatus 400 for packaging items using the perforated shrink film 100 of the present invention will be described. While various configurations of the packaging apparatus 400 are possible, two configuration examples, a first packaging apparatus 400a and a second packaging apparatus 400b, will be described here. [First Packaging Apparatus 400a] FIG. 6 is a diagram showing an example configuration of the first packaging apparatus 400a of the present invention. As shown in FIG. 6(a), the first packaging apparatus 400a is an example configuration including a backing paper supply unit 410, a double-sided tape application device 420a, a packaged item transfer device 430, a perforated shrink film supply unit 440, a covering and fixing device 450, a heat shrink device 460, and a conveying path 470. Each component will be described below.

[0042] The conveying path 470 provides a path along which the perforated shrink film 100 and the backing sheet 200 are conveyed in a predetermined orientation. In the configuration example of FIG. 6 , there is only one conveying path 470. Another possible configuration is one with two conveying paths: a "main conveying path" and a "sub-conveying path" that supplies backing sheets, perforated shrink film, and packaged items to the main conveying path from the side of the main conveying path. For example, the running directions of the two paths may be perpendicular to each other, with items being transferred from the sub-conveying path to the main conveying path at their intersection. The following description will be based on the configuration example of FIG. 6 , in which items are conveyed along a single conveying path and various components are supplied along the path. While the structure of the conveying path 470 is not shown, for example, a conveying mechanism may include vertically opposing endless track belts that move along the conveying path, and the backing sheet 200 is conveyed along the conveying path 470 while resting on the belts. The structure of the conveyor path 470 is diverse. For example, the conveyor mechanism may be a continuous track belt that moves along the conveyor path, similar to the conveyor path 470, folded back via pulleys at both ends, and driven by the pulleys at both ends. Since such conveyor mechanisms are widely known as mechanisms for transporting objects, further detailed explanations will be omitted here. Along the conveyor path 470, as will be described later, there are a backing paper supply unit 410, a double-sided tape application device 420a, a packaged object transfer device 430, a porous shrink film supply unit 440, a covering and fixing device 450, and a heat shrink device 460, and the processes are carried out in this order until the package is completed.

[0043] The backing sheet supply unit 410 is a feeder that supplies backing sheets 200 in accordance with the packaging operation of the first packaging device 400a. For example, it is configured to include a backing sheet stack that holds a large number of backing sheets 200, a backing sheet feed unit that removes backing sheets 200 from the backing sheet stack one by one in accordance with the packaging operation, and a backing sheet transport device that sends the removed backing sheets 200 in a predetermined orientation to the transport path 470. In this way, the backing sheet supply unit 410 is configured to send out backing sheets 200 to the transport path 470 in accordance with the packaging operation of the first packaging device 400a.

[0044] The double-sided tape application device 420a is a device that applies double-sided tape 510 to a predetermined position on a backing sheet 200 supplied from a backing sheet supply unit 410. The double-sided tape application device 420a can have a variety of structures, but here, the double-sided tape material supplied is assumed to be half-cut double-sided tape 500 with a release liner. The half-cut double-sided tape 500 with a release liner has a two-layer structure, with the surface layer being half-cut double-sided tape 510 that has been half-cut to an appropriate length, and the back layer being a release liner 520 that holds the half-cut double-sided tape 510 of the surface layer so that it can be peeled off. The release liner 520 of the back layer is in the form of a continuous tape, and the half-cut double-sided tape 510 of the surface layer is provided on the release liner 520 like a continuous piece, but in reality the half-cut double-sided tape 510 is half-cut to a predetermined length, with strips lined up on the release liner 520. The double-sided tape application device 420 a is a device that can automatically apply the half-cut double-sided tape 510 to a predetermined location on the mount 200 .

[0045] 7 is a diagram simply illustrating the configuration of the double-sided tape application device 420a. As shown in Fig. 7, the double-sided tape application device 420a is configured as a module including a roll body attachment unit 421, a rotary application rolling and pressing unit 422, and a release liner recovery unit 423.

[0046] The roll body attachment section 421 rotatably supports the roll-shaped half-cut double-sided tape with a release liner 500. Like a so-called reel unwinding device, it rotates to unwind the half-cut double-sided tape with a release liner 500. In other words, the half-cut double-sided tape with a release liner 500 is mounted in a roll shape on the roll body attachment section 421 of the double-sided tape application device 420a so that it can be unwound.

[0047] The rotary application rolling section 422 is a component over whose outer surface the half-cut double-sided tape 500 with release liner unwound from the roll body mounting section 421 passes, and the rotary application rolling section 422 rotates and presses while coming into contact with a predetermined location on the backing paper 200 to be applied, thereby rolling and applying the half-cut double-sided tape 510, which has been half-cut into many small pieces, to the predetermined location on the backing paper 200.

[0048] The release liner recovery section 423 recovers the release liner 520 remaining after passing through the rotary laminating and pressing section 422. The release liner 520 is wound up and recovered by rotating like a so-called reel winding device.

[0049] The application operation of the double-sided tape application device 420a may be any operation in which the double-sided tape application device 420a and the backing sheet 200 move relative to each other while coming into contact with each other, and there are at least two patterns. Application operation pattern 1 is a pattern in which the double-sided tape application device 420a moves in the vertical direction, and the backing sheet 200 travels along the transport path 470. Application operation pattern 2 is a pattern in which the backing sheet 200 traveling along the transport path 470 stops temporarily just below the double-sided tape application device 420a, and the double-sided tape application device 420a moves while coming into contact with the stationary backing sheet 200 to apply the tape.

[0050] First, an example of application operation pattern 1 will be described. FIG. 8 is a simplified diagram illustrating application operation pattern 1 of the double-sided tape application device 420a. As shown in FIG. 8(a), the backing sheet 200 moves on a transport path (in this case, transport path 470). In this state, it passes directly below the double-sided tape application device 420a. Then, as shown in FIG. 9(a), the double-sided tape application device 420a descends to abut against a predetermined location on the surface of the backing sheet 200, and reaches a height at which the rotary application rolling unit 422 abuts against the surface of the backing sheet 200. While the backing sheet 200 moves in this state, the rotary application rolling unit 422 continues to abut against the surface of the backing sheet 200. If the surface of the backing sheet 200 has physical properties that strongly adhere to the adhesive surface of the half-cut double-sided tape 510, the half-cut double-sided tape 510 will peel off from the release liner 520 at the same time as it is applied. The release liner 520 is collected in the release liner collection unit 423. Here, as shown in FIG. 8( b), once the application of the half-cut double-sided tape 510 to the predetermined location on the backing sheet 200 is completed, as shown in FIG. 9( b), the double-sided tape application device 420a rises so that it no longer abuts against the surface of the backing sheet 200, and the rotary application rolling unit 422 reaches a height that separates it from the surface of the backing sheet 200. Here, the half-cut double-sided tape 510 is half-cut to a predetermined length into continuous strips that are easily torn at any position (the edge of the strip). When the double-sided tape application device 420a rises and separates from the surface of the backing sheet 200, the strips of half-cut double-sided tape 510 that were applied to the backing sheet 200 remain on the surface of the backing sheet 200, but the unapplied strips of half-cut double-sided tape 510 rise along with the double-sided tape application device 420a while being held on the release liner 520.

[0051] Furthermore, in the double-sided tape application device 420 of the present invention, the double-sided tape used for application may be a continuous double-sided tape or half-cut double-sided tape 510 that has been pre-cut into strips. However, if the half-cut double-sided tape 510 is pre-cut into strips, the strips are independent, so the application direction of adjacent strips of half-cut double-sided tape 510 can be easily controlled in accordance with the movement of the double-sided tape application device 420. In other words, in addition to linear application, curved application as shown in FIG. 10( a) and application on a three-dimensional curved surface with smoothly varying heights from top to bottom as shown in FIG. 10( b) can easily be performed. The above is an overview of application pattern 1 of the double-sided tape application device 420a.

[0052] Next, an example of pattern 2 of the application operation will be described. FIG. 11 is a diagram simply illustrating pattern 2 of the application operation of the double-sided tape application device 420a. As shown in FIG. 11(a), the backing sheet 200 moves on a transport path (in this case, transport path 470) and stops immediately below the double-sided tape application device 420a. With the backing sheet 200 stationary, as in FIG. 9(a), the double-sided tape application device 420a descends to abut against a predetermined location on the surface of the backing sheet 200, and the rotary application rolling unit 422 reaches a height at which it abuts against the surface of the backing sheet 200. In this state, the double-sided tape application device 420a moves along a predetermined trajectory, and the rotary application rolling unit 422 continues to abut against the surface of the backing sheet 200. Because the surface of the backing sheet 200 has physical properties that allow strong adhesion to the adhesive surface of the half-cut double-sided tape 510, the half-cut double-sided tape 510 is peeled off from the release liner 520 and adhered to the surface of the backing sheet 200. The release liner 520 is collected in the release liner recovery unit 423. Here, as shown in FIG. 8( b), when the double-sided tape application device 420a moves along a predetermined trajectory and finishes applying the half-cut double-sided tape 510 to a predetermined location on the backing sheet 200, the double-sided tape application device 420a rises so that it no longer abuts the surface of the backing sheet 200, as shown in FIG. 9( b), and the rotary application rolling unit 422 reaches a height that separates it from the surface of the backing sheet 200. Here, the half-cut double-sided tape 510 is half-cut to a predetermined length into a series of rectangular pieces, which are easily torn at any position (the edge of the piece). As shown in Figure 8 (b), when the double-sided tape application device 420a rises and moves away from the surface of the backing sheet 200, the pieces of half-cut double-sided tape 510 that have been applied to the backing sheet 200 remain on the surface of the backing sheet 200, but the pieces of half-cut double-sided tape 510 that have not been applied rise up along with the double-sided tape application device 420a while being held on the release liner 520.

[0053] Incidentally, when applying using the method of applying operation pattern 2, as with applying operation pattern 1, the applying direction can be easily controlled in accordance with the movement of the double-sided tape applying device 420. In other words, in addition to applying in a straight line, it is easy to apply in a curved direction as shown in Fig. 10(a) or on a three-dimensional curved surface with smoothly varying heights as shown in Fig. 10(b). This is an overview of the operation of applying operation pattern 2 of the double-sided tape applying device 420a.

[0054] Next, returning to FIG. 6 , the packaged item transfer device 430 will be described. The packaged item transfer device 430 is a device that transfers the packaged item 300 to a predetermined position on the backing sheet 200. The packaged item transfer device 430 can be configured in various ways. For example, it may be a device that picks the packaged item 300 using something like a robot arm and transfers the packaged item 300 to a predetermined position on the backing sheet 200 being transported along the conveying path 470. Note that this packaged item transfer device 430 is an optional component of the packaging device 400 of the present invention, and as a simplified means, the packaged item transfer device 430 may be omitted, and a worker at a predetermined position on the conveying path 470 may manually place the packaged item 300 at a predetermined position on the backing sheet 200.

[0055] Next, the perforated shrink film supply unit 440 will be described. The perforated shrink film supply unit 440 is a feeder that supplies perforated shrink film 100 in accordance with the packaging operation of the first packaging apparatus 400a. For example, the perforated shrink film supply unit 440 includes a perforated shrink film stack that holds a large number of perforated shrink films 100 as shown in Example 1, a perforated shrink film feed unit that removes perforated shrink film 100 from the perforated shrink film stack one by one in accordance with the packaging operation, and a perforated shrink film transport unit that feeds the removed perforated shrink film 100 in a predetermined orientation to the covering and fixing device 450. In the perforated shrink film supply unit 440, the perforated shrink film transport unit delivers the perforated shrink film 100 to the covering and fixing device 450 in accordance with the packaging operation of the first packaging apparatus 400a.

[0056] The covering and fixing device 450 is a device that fixes the periphery (edge) of the perforated shrink film 100 by transferring the perforated shrink film 100 onto the double-sided tape 510 and pressing it so as to cover the packaged item 300 placed on the backing sheet 200. As described above, the double-sided tape 510 (here, the half-cut double-sided tape 510) is attached to a predetermined location on the backing sheet 200, and the non-packaged item 300 is also transferred to a predetermined location on the backing sheet 200. In this state, the covering and fixing device 450 receives the perforated shrink film 100 from the perforated shrink film supply unit 440, and places the perforated shrink film 100 on the double-sided tape 510 while covering the packaged item 300. The perforated shrink film 100 may be attached to any part of the double-sided tape 510, but is usually attached to the edge of the perforated shrink film 100.

[0057] The back layer of the double-sided tape 510 is coated with an adhesive that adheres to the backing sheet 200, thereby firmly adhering it to the backing sheet 200, and the front layer is coated with an adhesive that adheres to the material (shrink film material) of the perforated shrink film 100, thereby firmly adhering it to the perforated shrink film 100, so that the perforated shrink film 100 is firmly fixed to a predetermined location on the backing sheet 200.

[0058] The heat shrink device 460 is a device that shrinks the perforated shrink film 100 by applying heat, thereby shrink-wrapping the packaged item 300. This heat shrink device 460 is widely used in shrink-wrapping processes, so a detailed description of it will be omitted here.

[0059] The operation of the first packaging apparatus 400a of the present invention according to Example 2 will be outlined below. FIG. 12 shows the flow of each process performed by the first packaging apparatus 400a of the present invention. As shown in FIG. 12, the process flow is comprised of a backing paper supplying process, a double-sided tape application process, a packaged item transfer process, a perforated shrink film supplying process, a covering and fixing process, and a shrinking process. As described above, the backing paper supplying process is a process of supplying a backing paper by the backing paper supply unit 410. The double-sided tape application process is a process of applying double-sided tape 510 to a predetermined position on the backing paper 200 supplied by the backing paper supplying process. Here, half-cut double-sided tape 510A is applied. The packaged item transfer process is a process of placing the packaged item 300 on the backing paper 200 by the packaged item transfer device 430. Note that the packaged item transfer device 430 may be omitted, and the packaged item 300 may be simply placed manually by an operator. The perforated shrink film supplying step is a step in which the perforated shrink film supplying unit 440 supplies the perforated shrink film. The covering and fixing step is a step in which the covering and fixing device 450 uses the perforated shrink film 100 to cover the packaged item 300 placed on the backing sheet 200, and then places the packaged item 300 on the double-sided tape 510 to fix the periphery of the perforated shrink film 100. The shrinking step is a step in which the perforated shrink film 100 is shrunk by applying heat from the heating shrink device 460, thereby shrink-wrapping the packaged item 300. As shown in Figure 12, a package is completed through each step.

[0060] [Second Packaging Apparatus 400b] Next, the second packaging apparatus 400b will be described. Figure 13 is a simplified diagram illustrating the configuration of the second packaging apparatus 400b according to the present invention. As shown in Figure 13(a), the second packaging apparatus 400b is an exemplary configuration including a backing paper supply unit 410, an adhesive application unit 420b, a packaged item transfer unit 430, a perforated shrink film supply unit 440, a covering and fixing unit 450, a heat shrink device 460, and a conveying path 470. Here, the backing paper supply unit 410, the packaged item transfer unit 430, the perforated shrink film supply unit 440, the covering and fixing unit 450, the heat shrink device 460, and the conveying path 470 may be similar to the respective components shown in the first packaging apparatus 400a, and therefore description thereof will be omitted here.

[0061] The adhesive applicator 420b is a device that applies adhesive to a predetermined position on the surface of the backing sheet 200. For example, it may be configured to include a tank that stores adhesive, a supply channel that supplies a fixed amount of adhesive from the tank, and an applicator head that applies the adhesive supplied from the supply channel to an object to be coated. The applicator head may be a roll head that applies adhesive while rolling over the surface of the object it comes into contact with. Such adhesive applicators are widely known, so further detailed description will be omitted here.

[0062] The second packaging device 400b is based on the premise that the adhesive used in the adhesive applicator 420b has the property of providing sufficient adhesive strength between the material of the backing sheet 200, such as paper, and the shrink film material of the perforated shrink film 100. Adhesives with such properties are not yet widely available on the market at the time of filing this application. However, if a superior adhesive with such properties is developed and made available, the second packaging device 400b will become possible. The outline of the operation of the second packaging device 400b of the present invention is also omitted here, as it is merely a matter of replacing the double-sided tape application process with an adhesive application process in the flow of the steps shown in FIG. 11 .

[0063] Next, as a variation of the package, an example will be described in which the perforated shrink film of the present invention is used to package an item on either the inner bottom, top, or inner peripheral wall of a box for transport. Figure 14 shows an example of a package in which the item 300 is directly packaged on the inner bottom of a box for transport using the perforated shrink film 100 of the present invention using the first packaging device 400 of the present invention. In the example of Figure 14 (a), the item 300 is placed on the inner bottom of the box, double-sided tape is applied around the periphery, or adhesive is applied, and then the perforated shrink film 100 of the present invention is attached. As shown in Figure 14 (b), the item 300 is placed between the inner bottom of the box and the perforated shrink film 100, and then shrink-wrapped and packaged. In the example of Figure 14, the item is placed on the inner bottom of the box for transport, but it is not limited to the inner bottom, and may also be on the inner top, inner peripheral wall, etc.

[0064] The above has illustrated and described preferred embodiments of the perforated shrink film, packaging using the perforated shrink film, packaging device, and packaging method using the perforated shrink film of the present invention, but it will be understood that various modifications are possible without departing from the technical scope of the present invention.

[0065] The perforated shrink film of the present invention can be widely used as a packaging material. The packaging device of the present invention can use the perforated shrink film to package a variety of items in a simple and stable manner.

[0066] REFERENCE SIGNS LIST 100 Perforated shrink film 110 Hole 120 Bridge 130 Roll body 140 Feeder 200 Mounting paper 300 Packaged item 400 Packaging device 410 Mounting paper supply section 420 Double-sided tape application device 421 Roll body attachment section 422 Rotary application and rolling section 423 Release liner recovery section 430 Packaged item transfer device 440 Perforated shrink film supply section 450 Covering and fixing device 460 Heat shrink device 470 Conveying path

Claims

A perforated shrink film that is affixed to a backing sheet so as to cover an object to be packaged in a state where the object to be packaged is loaded on the backing sheet, wherein a large number of holes are formed in the shrink film, and portions between the holes are formed as bridges, and in heat shrinkage, the object to be packaged is clamped by a large number of the bridges. A perforated shrink film characterized by the above.

2. The perforated shrink film according to claim 1, wherein the holes are short line segment or short thick line segment cut holes, and a large number of the short line segment or short thick line segment cut holes are formed regularly or irregularly.

3. The perforated shrink film according to claim 1, wherein the holes are polygonal opening holes, and a large number of the polygonal opening holes are formed regularly or irregularly to form a mesh shape.

4. The perforated shrink film according to claim 1, wherein the holes are circular or elliptical opening holes, or arc-shaped cut holes, and a large number of the circular or elliptical opening holes, or the arc-shaped cut holes are formed regularly or irregularly.

5. A package using a perforated shrink film in which an object to be packaged is shrink-wrapped with the perforated shrink film according to any one of claims 1 to 4.

6. The perforated shrink film according to claim 5, wherein the perforated shrink film is affixed to a sheet-shaped backing sheet, and the shrink-wrapping is performed with the object to be packaged loaded between the backing sheet and the perforated shrink film. A package using the perforated shrink film characterized by the above.

7. The perforated shrink film according to claim 5, wherein the perforated shrink film is affixed to any one of the bottom inner surface, the back surface of the top surface, or the inner peripheral wall surface of a transport box, and the shrink-wrapping is performed with the object to be packaged loaded between any one of the bottom inner surface, the back surface of the top surface, or the inner peripheral wall surface of the box and the perforated shrink film. A package using the perforated shrink film characterized by the above.

8. A backing sheet supply unit for supplying a backing sheet, A double-sided tape affixing unit for affixing a double-sided tape to a predetermined position of the backing sheet supplied from the backing sheet supply unit, An object-to-be-packaged transfer unit for placing an object to be packaged on the backing sheet, A porous perforated shrink film supply unit that supplies the porous perforated shrink film according to any one of claims 1 to 4, A covering and fixing device that fixes the periphery of the porous perforated shrink film by covering the object to be packaged placed on the backing paper with the porous perforated shrink film and placing it on the double-sided tape while covering it, A packaging device for an object to be packaged, comprising a shrinking device that shrinks the porous perforated shrink film by heat application to shrink-wrap the object to be packaged.

9. The packaging device according to claim 8, wherein in the double-sided tape, one-sided adhesive is capable of adhering to the shrink film material, and the adhesive on the opposite side is capable of adhering to the surface of the backing paper.

10. A backing paper supply unit that supplies a backing paper, An object transfer unit that places the object to be packaged on the backing paper, An adhesive application unit that supplies and applies an adhesive to a predetermined position between the surface of the backing paper and the porous perforated shrink film, A porous perforated shrink film supply unit that supplies the porous perforated shrink film according to any one of claims 1 to 4, A covering and fixing step of fixing the periphery of the porous perforated shrink film by covering the object to be packaged with the porous perforated shrink film and placing it on the adhesive while covering it, A packaging device for an object to be packaged, comprising a shrinking device that shrinks the porous perforated shrink film by heat application to shrink-wrap the object to be packaged.

11. A backing paper supply step of supplying a backing paper, A double-sided tape sticking step of sticking a double-sided tape to a predetermined position of the backing paper supplied by the backing paper supply step, An object transfer step of placing the object to be packaged on the backing paper, A porous perforated shrink film supply step of supplying the porous perforated shrink film according to any one of claims 1 to 4, A covering and fixing step of fixing the periphery of the porous perforated shrink film by covering the object to be packaged placed on the backing paper with the porous perforated shrink film and placing it on the double-sided tape while covering it, A packaging method for an object to be packaged using a porous perforated shrink film, comprising a shrinking step of shrinking the porous perforated shrink film by heat application to shrink-wrap the object to be packaged.

12. A backing paper supply step of supplying a backing paper, An object transfer step of placing the object to be packaged on the backing paper, A porous perforated shrink film supply step of supplying the porous perforated shrink film according to any one of claims 1 to 4, An adhesive application step of applying an adhesive to a predetermined position on the surface of the backing paper, A covering and fixing step of covering the object to be packaged placed on the backing paper with the porous perforated shrink film and placing it on the applied portion of the adhesive to fix the periphery of the porous perforated shrink film, A packaging method for an object to be packaged using a porous perforated shrink film, characterized in that it comprises a shrinking step of shrinking the porous perforated shrink film by heat application to shrink-wrap the object to be packaged.

13. A method for manufacturing a porous perforated shrink film for manufacturing the porous perforated shrink film according to any one of claims 1 to 4, A shrink film supply step of supplying a shrink film, A release sheet forming step of laminating by applying a release sheet coated with a release agent to the back surface of the supplied shrink film, A cut forming step of forming at least one layer of the shrink film or two layers of the shrink film layer and the release sheet layer with a Thomson blade provided with a blade type corresponding to the cut for forming the hole by the Thomson blade, A manufacturing method of a porous perforated shrink film, characterized in that it comprises a peeling step of peeling the release sheet layer from the shrink film layer.

14. The shrink film material supplied in the shrink film supply step is a roll-shaped continuous body, The release sheet supplied in the release sheet forming step is a roll-shaped continuous body, The manufacturing method of the porous perforated shrink film according to claim 13, wherein the Thomson blade used in the cut forming step is provided on the surface of a rotating body, and the holes are continuously formed in the cut forming step by the continuous rotation of the rotating body.

15. The shrink film material supplied in the shrink film supply step is a single-leaf flat sheet or a multi-leaf accordion fold, The release sheet supplied in the release sheet forming step is a single-leaf flat sheet or a multi-leaf accordion fold, The Thomson blade used in the notch forming step is provided on the surface of the flat plate, and in the notch forming step by the Thomson blade of the flat plate, the holes are formed in a single-leaf sheet unit or in a multi-leaf accordion fold, according to the method for manufacturing a porous perforated shrink film according to claim 13.