Composite Film

Abstract

To provide a composite film which has beautifulness and can improve beauty, has concealing property and prevents visual recognition from an outer surface to an inner surface, and permits transmission of microwaves without reflecting the microwaves.SOLUTION: A composite film 10A is formed of a first synthetic resin film 11 formed of a thermoplastic synthetic resin, a tin vapor-deposited film 12 which has a tin vapor-deposited layer 19 and is joined to an outer surface 23 of the first synthetic resin film 11, a printing film 13 which has a printed surface 26 printed with a predetermined drawing and is joined to an outer surface 28 of the tin vapor-deposited film 12, a first adhesive layer 14 which joins the first synthetic resin film 11 and the tin vapor-deposited film 12 and is transparent, and a second adhesive layer 15 which joins the tin vapor-deposited film 12 and the printing film 13 and is transparent. In the composite film 10A, the tin vapor-deposited film 12 can transmit microwaves.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a composite film. [Background technology]

[0002] An aluminum vapor deposition film has been disclosed, which comprises a base layer and an aluminum vapor deposition layer laminated on the upper surface of the base layer, the base layer being formed from resin composition A made from polypropylene and resin composition B which is a mixture of a cyclic polyolefin polymer made from a copolymer of norbornene and ethylene and a polyolefin (see Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2011-224921 A Summary of the Invention [Problem to be solved by the invention]

[0004] The aluminum vapor-deposited film disclosed in Patent Document 1 has a gloss or semi-glossy film due to the aluminum vapor-deposited layer, and the aesthetic appearance of the film is improved due to the cosmetic properties of the aluminum vapor-deposited layer, while the concealing properties of the aluminum vapor-deposited layer make it impossible to see from the outer surface to the inner surface of the film. However, when this aluminum vapor-deposited film is used as a base roll for a storage container or a packaging bag, and the contents (objects to be heated) filled in the storage container or packaging bag made from it are heated in a microwave oven, as shown in Fig. 12, which explains the reflection of microwaves at the aluminum vapor-deposited film layer, the microwaves radiated from the microwave oven are reflected by the aluminum vapor-deposited layer, and as shown by arrow Z2 in Fig. 12, the microwaves cannot pass through the aluminum vapor-deposited film layer, and the microwaves do not reach the contents (objects to be heated), and the contents (objects to be heated) cannot be heated.

[0005] Furthermore, when IC tags are attached to storage containers or packaging bags made from this aluminum vapor deposition film and the IC tags are used to manage (tally) inventory, stocktaking, sales, etc., the aluminum vapor deposition layer acts as an antenna and irradiates radio waves (radio wave jamming), causing the IC tag to malfunction and making it impossible to smoothly read the various data stored in the IC tag with an IC tag reader, or the aluminum vapor deposition layer blocks radio waves, making it impossible for the IC tag to communicate with the IC tag reader, making it impossible to manage inventory, stocktaking, sales, etc., all at once using the IC tag.

[0006] An object of the present invention is to provide a composite film that has a cosmetic property to improve aesthetic appearance, has a concealing property to make it impossible to see from the outer surface to the inner surface, and allows microwaves to pass through without being reflected. Another object of the present invention is to provide a composite film that has a barrier function against ultraviolet rays, can block ultraviolet rays, and can prevent deterioration of the contents contained therein, changes in physical properties, and changes in taste. Another object of the present invention is to provide a composite film that can prevent malfunction of IC tags, prevent blocking of radio waves, and enable integrated management of inventory, stocktaking, sales, etc. using IC tags. [Means for solving the problem]

[0007] The composite film according to the present invention for solving the above problems includes a first synthetic resin film made of a thermoplastic synthetic resin, a tin-deposited film having a tin-deposited layer and bonded to an outer surface of the first synthetic resin film, a printed film having a printed surface on which a predetermined picture is printed and bonded to the outer surface of the tin-deposited film, a transparent first adhesive layer applied to either the first synthetic resin film or the tin-deposited film to bond the first synthetic resin film and the tin-deposited film, a transparent second adhesive layer applied to either the tin-deposited film or the printed film to bond the tin-deposited film and the printed film, and any one of the printed film and the second adhesive layer. a UV cut-off agent layer that blocks ultraviolet rays and is applied to either the second adhesive layer or the tin-deposited film, or to either the tin-deposited film or the first adhesive layer; the tin-deposited film is formed from a second synthetic resin film made of a transparent thermoplastic synthetic resin and a tin-deposited layer that is deposited on either the inner or outer surface of the second synthetic resin film; the tin-deposited film has a formed portion where a tin-deposited layer is formed and a non-formed portion where a tin-deposited layer is not formed on the tin-deposited surface of the second synthetic resin film; and the unit area (1 cm x 1 cm: 1 cm) of the second synthetic resin film is 100% or more. 2 The ratio of the tin deposition layer to the unit area (1 cm × 1 cm: 1 cm) of the second synthetic resin film is in the range of 75 to 85%. 2 the ratio of the non-formed areas of the tin-vapor-deposited layer to the total area of ​​the tin-vapor-deposited layer is in the range of 15 to 25%, the thickness of the tin-vapor-deposited film is in the range of 10 to 14 μm, the thickness of the UV-cutting agent layer is in the range of 2 to 4 μm, and in the formed areas, the surface of the second synthetic resin film is covered with the tin-vapor-deposited layer, while in the non-formed areas, the surface of the second synthetic resin film is exposed and the second synthetic resin film faces the first synthetic resin film or the printed film.

[0008] As an example of the composite film of the present invention, in the composite film, microwaves can be transmitted through the tin-deposited film, A container body made of polyolefin thermoplastic resin Made of composite film and a lid material that closes an upper opening of the container body, the first synthetic resin film forming the inner surface of the lid material and the printed film forming the outer surface of the lid material, and the contents contained in the container body of the microwave oven container can be heated by irradiating microwaves, or The container is made of a composite film and has upper and lower edge portions extending laterally, both side edge portions extending vertically, and a storage space surrounded by the upper and lower edge portions and both side edge portions, and the first synthetic resin film forms an inner surface and the printed film forms an outer surface. packaging bag Storage space forThe contents contained in the container can be heated by irradiating them with microwaves.

[0009] In another embodiment of the composite film of the present invention, the composite film allows radio waves to pass through the tin-deposited film, enabling communication between an electronic data reader and an electronic data storage medium attached to the composite film.

[0010] In another example of the composite film of the present invention, the tin-vapor-deposited layer is colorless silver or colored silver, and the tin-vapor-deposited film has a glossy or semi-glossy property, thereby improving the aesthetic appearance, and also has a concealing property that makes it impossible to see from the outer surface to the inner surface.

[0011] In another example of the composite film of the present invention, the printed film is a transparent vapor-deposited film having both gas barrier properties and water vapor barrier properties, and a predetermined graphic is printed on the lower surface of the transparent vapor-deposited film.

[0012] In another example of the composite film of the present invention, the thickness of the first synthetic resin film is in the range of 45 to 55 μm, and the thickness of the printed film is in the range of 10 to 14 μm.

[0013] In another example of the composite film of the present invention, the thickness dimension of the first and second adhesive layers is in the range of 2 to 4 μm. Effect of the Invention

[0014] According to the composite film of the present invention, it is formed of a first synthetic resin film made of a thermoplastic synthetic resin, a tin-deposited film having a tin-deposited layer and bonded to the outer surface of the first synthetic resin film, and a printed film having a printed surface on which a predetermined picture is printed and bonded to the outer surface of the tin-deposited film, the tin-deposited film gives the composite film a gloss or semi-gloss, the aesthetics of the tin-deposited film can improve the aesthetics of the composite film, the concealment of the tin-deposited film can make one surface (inner surface) invisible from the other surface (outer surface), and the tin-deposited film does not reflect microwaves but can transmit microwaves. When a package bag or container made of the composite film contains an item (object to be heated) and the item is heated in a microwave oven, the composite film can transmit microwaves radiated from the microwave oven, so that the item (object to be heated) can be sufficiently heated in the microwave oven. Even if an IC tag is attached to a packaging bag or storage container made from the composite film, the tin-deposited film does not irradiate radio waves in a random manner, preventing the IC tag from malfunctioning. Various data stored in the IC tag can be smoothly read by an IC tag reader. In addition, the tin-deposited film does not block radio waves, enabling communication between the IC tag and the IC tag reader. The IC tag can be used to centrally manage inventory, stocktaking, sales, etc.

[0015] A composite film that allows microwaves to pass through and that allows items placed in a packaging bag or storage container made from the composite film to be heated by irradiating them with microwaves means that when an item (item to be heated) placed in a packaging bag or storage container made from the composite film is heated in a microwave oven, the microwaves radiated from the microwave oven can pass through the tin-deposited film, so that the item (item to be heated) can be reliably heated in the microwave oven.

[0016] A composite film that allows radio waves to pass through and enables communication between an electronic data reading device and an electronic data storage medium attached to the composite film does not radiate radio waves indiscriminately from the tin-deposited film, preventing malfunction of electronic data storage media such as IC tags and allowing various data stored in electronic data storage media such as IC tags to be smoothly read by an electronic data reading device such as an IC tag reader, and does not block radio waves, enabling communication between electronic data storage media such as IC tags and electronic data reading devices such as IC tag readers, making it possible to centrally manage inventory, stocktaking, sales, etc. using electronic data storage media such as IC tags.

[0017] A composite film in which a first synthetic resin film and a tin-vapor-deposited film are bonded together by a transparent first adhesive layer applied to one of the films, and a tin-vapor-deposited film and a printed film are bonded together by a transparent second adhesive layer applied to one of the films, can firmly bond the first synthetic resin film and the tin-vapor-deposited film together by the first adhesive layer, and can firmly bond the tin-vapor-deposited film and the printed film together by the second adhesive layer, thereby preventing inadvertent peeling of the films. The composite film, together with the tin vapor-deposited film, does not reflect microwaves, and the contents (objects to be heated) filled in a packaging bag or storage container made from it can be sufficiently heated in a microwave oven. Even if an IC tag is attached to a packaging bag or storage container made from it, the tin vapor-deposited film and the first and second adhesive layers do not irradiate radio waves in a random manner, preventing the IC tag from malfunctioning and allowing various data stored in the IC tag to be smoothly read by an IC tag reader. The tin vapor-deposited film and the first and second adhesive layers do not block radio waves, enabling communication between the IC tag and an IC tag reader, and the IC tag can be used to manage inventory, stocktaking, sales, etc., in a centralized manner.

[0018] A composite film including a UV-cutting agent layer that blocks ultraviolet rays, the UV-cutting agent layer being applied to either the printed film or the second adhesive layer, or to either the second adhesive layer or the tin-deposited film, or to either the tin-deposited film or the first adhesive layer, has a UV-cutting agent layer (transparent UV-cutting agent layer, translucent UV-cutting agent layer, opaque UV-cutting agent layer) that gives the composite film a barrier function against ultraviolet rays and can block ultraviolet rays, thereby preventing deterioration and changes in physical properties and taste of the contents filled in the packaging bag or storage container made therefrom. The composite film has a tin vapor deposition film and a UV-cutting agent layer that do not reflect microwaves, so that a package bag or storage container made from the composite film can be filled with an item (item to be heated) and sufficiently heated in a microwave oven. Even if an IC tag is attached to a package bag or storage container made from the composite film, the tin vapor deposition film and the UV-cutting agent layer do not irradiate radio waves in a random manner, preventing the IC tag from malfunctioning and allowing various data stored in the IC tag to be smoothly read by an IC tag reader. The tin vapor deposition film and the UV-cutting agent layer do not block radio waves, so communication between the IC tag and the IC tag reader is possible, and the IC tag can be used to manage inventory, stocktaking, sales, etc., all at once.

[0019] In a composite film in which the tin-deposited film is formed from a second synthetic resin film made of a transparent thermoplastic synthetic resin and a tin-deposited layer deposited on either the inner or outer surface of the second synthetic resin film, the tin-deposited layer deposited on either the inner or outer surface of the second synthetic resin film gives the composite film a gloss or semi-glossiness, the aesthetic properties of the tin-deposited layer can improve the aesthetic feel of the composite film, the concealment properties of the tin-deposited layer can make one surface (inner surface) invisible from the other surface (outer surface), and the tin-deposited layer does not reflect microwaves but can transmit them. When a package bag or storage container made from the composite film contains an item (object to be heated) and the item (object to be heated) is heated in a microwave oven, the composite film can transmit microwaves radiated from the microwave oven, so that the item (object to be heated) can be sufficiently heated in the microwave oven. Even if an IC tag is attached to a packaging bag or storage container made from the composite film, the tin-vapor-deposited layer does not irradiate radio waves, preventing the IC tag from malfunctioning. Various data stored in the IC tag can be smoothly read by an IC tag reader. The tin-vapor-deposited layer does not block radio waves, enabling communication between the IC tag and the IC tag reader. The IC tag can be used to centrally manage inventory, stocktaking, sales, etc.

[0020] The tin-deposited film has a formed portion where a tin-deposited layer is formed on the tin-deposited surface of the second synthetic resin film and a non-formed portion where no tin-deposited layer is formed, and the surface of the second synthetic resin film is covered with a tin-deposited layer at the formed portion, and the surface of the second synthetic resin film is exposed at the non-formed portion, and the second synthetic resin film faces the first synthetic resin film or the printed film. Since the non-formed portion of the second synthetic resin film where no tin-deposited layer is formed can transmit microwaves radiated from a microwave oven, the packaging made of the composite film can be used. When the contents (object to be heated) filled in a packaging bag or storage container are heated in a microwave oven, the contents (object to be heated) can be sufficiently heated in the microwave oven, and even if an IC tag is attached to a packaging bag or storage container made of the composite film, the tin vapor-deposited layer does not radiate radio waves in a random manner, preventing the IC tag from malfunctioning, and various data stored in the IC tag can be smoothly read by an IC tag reader. The tin vapor-deposited layer does not block radio waves, enabling communication between the IC tag and the IC tag reader, and the IC tag can be used to centrally manage inventory, stocktaking, sales, etc. The tin vapor-deposited layer at the formation site gives the composite film a gloss or semi-gloss appearance, the cosmetic properties of the tin vapor-deposited layer can improve the aesthetic appearance of the composite film, and the concealing properties of the tin vapor-deposited layer can make it impossible to see one side (inner side) of the composite film from the other side (outer side).

[0021] The ratio of the tin vapor deposition layer to the unit area of ​​the second synthetic resin film is 75 to 85 %, and the ratio of the area of ​​the second synthetic resin film where the tin vapor deposition layer is not formed to the unit area of ​​the second synthetic resin film is in the range of 15In the composite film in which the ratio of the formation area of ​​the tin vapor-deposited layer to the unit area of ​​the second synthetic resin film is in the range of 100% to 25%, the tin vapor-deposited layer at the formation area can impart gloss or semi-gloss to the composite film, and the aesthetic properties of the tin vapor-deposited layer at the formation area with said ratio can improve the aesthetic feel of the composite film, while the concealing properties of the tin vapor-deposited layer at the formation area with said ratio can make it impossible to see one side (inner side) of the composite film from the other side (outer side). The composite film has a ratio of the non-formed portions of the tin vapor-deposited layer to the unit area of ​​the second synthetic resin film within the above range, and can reliably transmit microwaves radiated from a microwave oven through the non-formed portions with the above ratio. Therefore, when an item (object to be heated) filled in a packaging bag or storage container made of the composite film is heated in a microwave oven, the item (object to be heated) can be reliably heated in the microwave oven. In addition, even if an IC tag is attached to a packaging bag or storage container made of the composite film, the tin vapor-deposited film having the non-formed portions does not radiate radio waves in a random manner, preventing the IC tag from malfunctioning and allowing various data stored in the IC tag to be smoothly read by an IC tag reader. The tin vapor-deposited film having the non-formed portions does not block radio waves, enabling communication between the IC tag and an IC tag reader, and the IC tag can be used to manage inventory, stocktaking, sales, etc., in a centralized manner.

[0022] A composite film in which the tin vapor-deposited layer is colorless silver or colored silver and the tin vapor-deposited film has a gloss or semi-glossy cosmetic property that enhances the aesthetic appearance and a concealing property that makes one side (inner side) invisible from the other side (outer side) can have a gloss or semi-glossy cosmetic property, because the tin vapor-deposited layer is colorless silver or colored silver. The cosmetic property of the tin vapor-deposited layer can improve the aesthetic appearance of the composite film, and the concealing property of the tin vapor-deposited layer makes it impossible to see one side (inner side) from the other side (outer side), making it impossible to see the contents (object to be heated) filled in a packaging bag or storage container made of the composite film from the outside.

[0023] The printed film is a transparent vapor deposition film having gas barrier properties as well as water vapor barrier properties, and a composite film in which a specified graphic is printed on the underside of the transparent vapor deposition film uses a transparent vapor deposition film having gas barrier properties as well as water vapor barrier properties as the printed film, which does not allow oxygen to pass through and can prevent oxidation of the contents (object to be heated) filled in a packaging bag or storage container made of the composite film, and does not allow water vapor to pass through and can prevent moisture from entering the contents (object to be heated) filled in a packaging bag or storage container made of the composite film.

[0024] In a composite film in which the thickness dimension of the first synthetic resin film is in the range of 45 to 55 μm and the thickness dimensions of the tin-deposited film and the printed film are in the range of 10 to 14 μm, since the thickness dimension of the first synthetic resin film is in the above range, the composite film has a predetermined strength, and the stiffness of a packaging bag or storage container made of the composite film is strong, and the packaging bag or storage container can be prevented from twisting, sagging, or collapsing. Since the thickness of the tin-deposited film is in the above range, the tin-deposited film can impart gloss or semi-gloss to the composite film, and the aesthetic appearance of the composite film can be improved by the cosmetic properties of the tin-deposited film, and the concealing properties of the tin-deposited film make it impossible to see one side (inner side) of the composite film from the other side (outer side), thereby making it impossible to see the contents from the outside. Since the thickness of the printed film of the composite film is within the above-mentioned range, it does not allow oxygen to pass through, and can reliably prevent oxidation of contents filled in a packaging bag or storage container made of the composite film, and it does not allow water vapor to pass through, and can reliably prevent moisture from entering the contents of a packaging bag or storage container made of the composite film.

[0025] In a composite film in which the thicknesses of the first and second adhesive layers and the UV cut agent layer are in the range of 2 to 4 μm, the films can be firmly bonded to each other and inadvertent peeling can be prevented because the thicknesses of the first and second adhesive layers are in the above range. Since the thickness of the UV cut agent layer of the composite film is in the above range, ultraviolet rays can be reliably blocked, and deterioration, changes in physical properties, and changes in taste of contents filled in a packaging bag or storage container made of the composite film can be prevented. [Brief description of the drawings]

[0026] [Figure 1] FIG. 2 is a perspective view of an example composite film. [Diagram 2] Cross-sectional view taken along line AA in FIG. [Diagram 3] FIG. 3 is an exploded perspective view of the composite film of FIG. 2. [Figure 4] FIG. 2 is a diagram illustrating microwave transmission through a tin-deposited film. [Diagram 5] 3 is a cross-sectional view taken along the arrows similar to FIG. 2 of a composite film shown as another example. [Figure 6] FIG. 6 is an exploded perspective view of the composite film of FIG. 5 . [Figure 7] 7 is a perspective view of a packaging bag shown as an example, which is made from the composite film shown in FIGS. 2 and 3 or the composite film shown in FIGS. [Figure 8] 8 is a cross-sectional view taken along line BB in FIG. 7 and a partially enlarged view of a packaging bag made from the composite film of FIGS. [Figure 9] 9 is a cross-sectional view similar to FIG. 8 and a partially enlarged view of a packaging bag made from the composite film of FIGS. [Figure 10] 7 is a perspective view of a microwave oven container as an example using the composite film shown in FIGS. 2 and 3 or the composite film shown in FIGS. 5 and 6. FIG. [Figure 11] FIG. 13 is a diagram showing an example of reading various data from an IC tag of a packaging bag or a microwave oven container by an IC tag reader. [Figure 12] FIG. 2 is a diagram illustrating the reflection of microwaves at an aluminum vapor-deposited film layer. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0027] The composite film according to the present invention will be described in detail below with reference to the accompanying drawings such as Fig. 1, which is a perspective view of composite films 10A and 10B as examples. Fig. 2 is a cross-sectional view taken along line AA in Fig. 1, and Fig. 3 is an exploded perspective view of the composite film 10A in Fig. 2. Fig. 4 is a diagram illustrating microwave transmission through a tin-deposited film 12. Fig. 1 shows the composite film 10A or 10B in a state in which it is wound around a pay-out roll 30. Figs. 2 and 3 partially show the composite film 10A, with the longitudinal direction indicated by arrow X, the lateral direction indicated by arrow Y, and the thickness direction indicated by arrow Z.

[0028] As shown in Figs. 2 and 3, the composite film 10A is formed from a first synthetic resin film 11, a tin-deposited film 12 (discontinuous tin-deposited film), a printed film 13, a first adhesive layer 14, and a second adhesive layer 15. In the composite film 10A, the first synthetic resin film 11, the first adhesive layer 14, the tin-deposited film 12, the second adhesive layer 15, and the printed film 13 are arranged in this order in the thickness direction from one surface 16 (inner surface) to the other surface 17 (outer surface). The first synthetic resin film 11 is a stretched film made by stretching a raw material (unstretched film) of a thermoplastic synthetic resin. Various types of PE and various types of PP are used as the thermoplastic synthetic resin for making the first synthetic resin film 11.

[0029] The thickness dimension L1 of the first synthetic resin film 11 is in the range of 45 to 55 μm, and preferably the thickness dimension L1 is 50 μm. If the thickness dimension L1 of the first synthetic resin film 11 is less than 45 μm, the strength of the first synthetic resin film 11 is reduced and the stiffness of the first synthetic resin film 11 is weakened, causing the composite film 10A to twist and sag, which may reduce the workability during processing such as bending, cutting, and tensioning the composite film 10A. If the thickness dimension L1 of the first synthetic resin film 11 exceeds 55 μm, the strength (rigidity) of the first synthetic resin film 11 becomes higher than necessary, and the composite film 10A becomes stiff, which may reduce the workability during processing such as bending, cutting, and tensioning. Since the thickness dimension L1 of the first synthetic resin film 11 is in the above range, the composite film 10A has a predetermined optimal strength, and the composite film 10A can be prevented from twisting, sagging, and stiffening, thereby improving the workability during processing of the composite film 10A.

[0030] The tin-deposited film 12 is formed of a second synthetic resin film 18 and a tin-deposited layer 19. The tin-deposited layer 19 is formed on an inner surface 20 of the second synthetic resin film 18 and is located directly below the second synthetic resin film 18. Alternatively, the tin-deposited layer 19 may be formed on an outer surface 21 of the second synthetic resin film 18 and the tin-deposited layer 19 may be located directly above the second synthetic resin film 18. The tin-deposited film 12 overlaps the outer surface 23 of the first synthetic resin film 11 with its inner surface 22 (the inner surface 22 of the second synthetic resin film 18) facing the outer surface 23 of the first synthetic resin film 11, and is joined (fixed) to the outer surface 23 of the first synthetic resin film 11 via the first adhesive layer 14.

[0031] The second synthetic resin film 18 is a stretched film made by stretching a raw sheet (unstretched film) of a transparent thermoplastic synthetic resin. The second synthetic resin film 18 may be a transparent vapor-deposited film, which will be described later. The tin vapor-deposited layer 19 is colorless silver or colored silver. The inner surface 20 (the surface of the second synthetic resin film 18 on which tin vapor-deposited layer 19 is formed) of the second synthetic resin film 18 on which the tin vapor-deposited layer 19 is formed has a formed portion 24 (a portion where the tin vapor-deposited layer 19 is present) where the tin vapor-deposited layer 19 is formed, and a non-formed portion 25 (a portion where the tin vapor-deposited layer 19 is not present) where the tin vapor-deposited layer 19 is not formed. The tin vapor-deposited film 12 has gloss or semi-gloss due to the colorless silver or colored silver tin vapor-deposited layer 19, and has cosmetic properties that improve aesthetics, as well as concealment properties that make it impossible to see from the other surface 17 (outer surface) of the composite film 10A to one surface 16 (inner surface).

[0032] In the formation regions 24 where the tin vapor-deposited layer 19 of the second synthetic resin film 18 is formed, the inner surface 20 of the second synthetic resin film 18 is covered with the tin vapor-deposited layer 19, and the second synthetic resin film 18 is covered with the colorless silver or colored silver tin vapor-deposited layer 19. In the non-formation regions 25 of the second synthetic resin film 18, the inner surface 20 (face) of the second synthetic resin film 18 is exposed between the formation regions 24 (between the tin vapor-deposited layers 19), and the inner surface 20 of the second synthetic resin film 18 and the outer surface 23 of the first synthetic resin film 11 directly face each other. When the tin vapor-deposited layer 19 is formed on the outer surface (face) of the second synthetic resin film 18, in the non-formation regions 25, the outer surface (face) of the second synthetic resin film 18 is exposed between the formation regions 24 (between the tin vapor-deposited layers 19), and the outer surface of the second synthetic resin film 18 and the inner surface 27 of the printing film 13 directly face each other.

[0033] In the tin-deposited film 12, as shown by arrow Z1 in Fig. 3, microwaves irradiated to the tin-deposited film 12 are reflected at a portion 24 where the tin-deposited layer 19 is formed, and cannot pass through the tin-deposited film 12 (second synthetic resin film 18). However, in a portion 25 where the tin-deposited layer 19 is not formed, the tin-deposited layer 19 is not present, and the microwaves are not reflected by the tin-deposited layer 19, and pass through the tin-deposited film 12 (second synthetic resin film 18). Therefore, the composite film 10A shown in Figs. 2 and 3 can reliably transmit microwaves, and an object to be heated that is located on one surface 16 (inner surface) of the composite film 10A can be heated by microwaves irradiated from the other surface 17 (outer surface) of the composite film 10A.

[0034] Furthermore, the tin-deposited film 12 having the absent portions 25 does not radiate radio waves in an irregular manner, the tin-deposited film 12 does not interfere with the radiation of radio waves, and the tin-deposited film 12 having the absent portions 25 (composite film 10A) does not block radio waves. Therefore, the composite film 10A shown in Figures 2 and 3 can radiate radio waves according to its radiation characteristics, and electronic data written in an IC tag 40 (electronic data storage medium) placed on one surface 16 (inner surface) of the composite film 10A can be read by an IC tag reader 50 (electronic data reading device) located on the other surface 17 (outer surface) of the composite film 10A.

[0035] The thickness dimension L2 of the tin-deposited film 12 is in the range of 10 to 14 μm, and preferably the thickness dimension L2 is 12 μm. If the thickness dimension L2 of the tin-deposited film 12 is less than 10 μm, the thickness dimension of the tin-deposited layer 19 becomes small, the tin-deposited film 12 cannot impart gloss or semi-gloss to the composite film 10A, the cosmetic properties of the tin-deposited film 12 decrease, the aesthetic appearance of the composite film 10A cannot be improved, and the hiding property of the tin-deposited film 12 decreases, making it impossible to make one surface 16 (inner surface) of the composite film 10A invisible from the other surface 17 (outer surface) of the composite film 10A. If the thickness dimension L2 of the tin-deposited film 12 exceeds 14 μm, the thickness dimension of the tin-deposited layer 19 will be larger than necessary, and the microwaves will be reflected by the tin-deposited layer 19, preventing the microwaves from passing through the tin-deposited film 12 (composite film 10A). In addition, the tin-deposited film 12 will scatter radio waves, which may interfere with the radiation of radio waves or may block radio waves.

[0036] The unit area of ​​the second synthetic resin film 18 (1 cm × 1 cm: 1 cm 2 The ratio of the tin deposition layer 19 to the area 24 is 75 to 100%. 85 %. The unit area (1 cm x 1 cm: 1 cm 2 The ratio of the non-formed portion 25 of the tin deposition layer 19 to the 15 If the proportion of the formed portions 24 of the tin-deposited layer 19 is less than 75% and the proportion of the non-formed portions 25 of the tin-deposited layer 19 exceeds 25%, the formed portions 24 become less than necessary, the tin-deposited film 12 cannot impart gloss or semi-gloss to the composite film 10A, the cosmetic properties of the tin-deposited film 12 decrease, the aesthetic appearance of the composite film 10A cannot be improved, and the hiding property of the tin-deposited film 12 decreases, making it impossible to make one surface 16 (inner surface) of the composite film 10A invisible from the other surface 17 (outer surface).

[0037] The proportion of the formation portion 24 of the tin deposition layer 19 is 85%, and the ratio of non-formed portions 25 of the tin deposition layer 19 exceeds 15 If it is less than %, the number of formation sites 24 will be greater than necessary, and the tin-deposited layer 19 will occupy the majority of the unit area of ​​the second synthetic resin film 18. As a result, microwaves will be reflected by the tin-deposited film 12 (tin-deposited layer 19), preventing the microwaves from passing through the tin-deposited film 12 (composite film 10A), and radio waves may be blocked by the tin-deposited film 12 (tin-deposited layer 19).

[0038] Since the thickness dimension L2 of the tin-deposited film 12 is within the above-mentioned range, the ratio of the formed portions 24 of the tin-deposited layer 19 to the unit area of ​​the second synthetic resin film 18 is within the above-mentioned range, and the ratio of the non-formed portions 25 of the tin-deposited layer 19 to the unit area of ​​the second synthetic resin film 18 is within the above-mentioned range, the tin-deposited film 12 can impart gloss or semi-gloss to the composite film 10A, the aesthetic properties of the tin-deposited film 12 can improve the aesthetic appearance of the composite film 10A, and the concealing properties of the tin-deposited film 12 make it impossible to see one surface 16 (inner surface) of the composite film 10A from the other surface 17 (outer surface) thereof, thereby making it impossible to see the contents of the composite film 10A from the outside.

[0039] Furthermore, microwaves are not reflected by the tin-deposited layer 19, and can pass through the tin-deposited film 12 (composite film 10A). Therefore, the composite film 10A shown in Figures 2 and 3 can reliably transmit microwaves. Furthermore, the tin-deposited film 12 (composite film 10A) does not diffusely reflect radio waves, so the tin-deposited film 12 does not interfere with the radiation of radio waves, and the tin-deposited film 12 (composite film 10A) having the non-formed portion 25 does not block radio waves. Therefore, the composite film 10A shown in Figures 2 and 3 can radiate radio waves according to its radiation characteristics.

[0040] The printed film 13 is a transparent vapor-deposited film that has gas barrier properties as well as water vapor barrier properties. The transparent vapor-deposited film is a functional film in which a transparent inorganic thin film is formed on the upper surface of a base film by a vapor deposition process, and an inorganic vapor-deposited barrier layer (alumina, silicon oxide, etc.) and a coating barrier layer are laminated on the upper surface of the base film (PET or PP).

[0041] The printed film 13 has a printed surface 26 (printed layer 26) on which a predetermined graphic is printed. The predetermined graphic (printed layer 26) is printed on the lower surface (inner surface) of the transparent vapor-deposited film (printed film 13). The graphic may be an image of a product (content) stored in a storage space 35, 47 of a packaging bag 30 or a microwave oven container 41 (storage container) described below, a product logo, a product name, a product description, a product advertisement, a product selling price, a product manufacturer or distributor, a product manufacturing date, a product expiration date, a product constituents, etc. The printed film 13 overlaps the tin-deposited film 12 with its inner surface 27 facing the outer surface 28 (tin-deposited layer 19) of the tin-deposited film 12, and is bonded (fixed) to the outer surface 28 of the tin-deposited film 12 via a second adhesive layer 15.

[0042] The thickness dimension L3 of the printed film 13 (transparent vapor deposition film) is in the range of 10 to 14 μm, and preferably the thickness dimension L3 is 12 μm. If the thickness dimension L3 of the printed film 13 (transparent vapor deposition film) is less than 10 μm, oxygen may pass through the printed film 13 (composite film 10A) and the contents (objects to be heated) contained in the storage space 35, 47 of the packaging bag 30 or the microwave oven container 41 may oxidize, and water vapor may pass through the printed film 13 (composite film 10A) and the contents (objects to be heated) contained in the storage space 35, 47 of the packaging bag 30 or the microwave oven container 41 may become damp. Since the thickness dimension L3 of the printed film 13 is in the above range, it does not allow oxygen to pass through, and can reliably prevent oxidation of the contents, and it does not allow water vapor to pass through, and can reliably prevent moisture from being present in the contents.

[0043] The first adhesive layer 14 is applied to either the outer surface 23 of the first synthetic resin film 11 or the inner surface 22 of the tin-deposited film 12, and bonds (adheres) the first synthetic resin film 11 to the tin-deposited film 12. In FIG. 2, the first adhesive layer 13 is applied to the entire outer surface 23 of the first synthetic resin film 11 or the inner surface 22 of the tin-deposited film 12, but the first adhesive layer 14 may be applied intermittently (partially) to the outer surface 23 of the first synthetic resin film 11 or the inner surface 22 of the tin-deposited film 12. The first adhesive layer 14 is transparent and has a thickness L4 in the range of 2 to 4 μm, and preferably has a thickness L4 of 3 μm.

[0044] If the thickness dimension L4 of the first adhesive layer 14 is less than 2 μm, the first synthetic resin film 11 and the tin-deposited film 12 cannot be firmly joined, and the adhesive strength between the films 11, 12 is insufficient, which may cause the films 11, 12 to peel off from each other. If the thickness dimension L4 of the first adhesive layer 14 exceeds 4 μm, the rigidity of the first adhesive layer 14 increases the rigidity of the composite film 10A, which may cause the composite film 10A to lose its flexibility, and the strength (rigidity) of the composite film 10A may become higher than necessary, which may cause the composite film 10A to become stiff, reducing workability during processing such as bending, cutting, and tensioning. Because the thickness dimension L4 of the first adhesive layer 14 is within the above range, the films 11, 12 can be firmly bonded to each other, preventing inadvertent peeling of the films 11, 12, and allowing the composite film 10A to maintain appropriate strength (rigidity) and flexibility, thereby improving workability during processing such as bending, cutting, and tensioning the composite film 10A.

[0045] The second adhesive layer 15 is applied to either the outer surface 28 of the tin-deposited film 12 or the inner surface 27 of the printed film 13, and bonds (adheres) the tin-deposited film 12 and the printed film 13. In FIG. 2, the second adhesive layer 15 is applied to the entire outer surface 28 of the tin-deposited film 12 or the inner surface 27 of the printed film 13, but the second adhesive layer 15 may be applied intermittently (partially) to the outer surface 28 of the tin-deposited film 12 or the inner surface 27 of the printed film 13. The second adhesive layer 15 is transparent and has a thickness dimension L5 in the range of 2 to 4 μm, and preferably has a thickness dimension L5 of 3 μm.

[0046] If the thickness dimension L5 of the second adhesive layer 15 is less than 2 μm, the tin-deposited film 12 and the printed film 13 cannot be firmly bonded together, and the adhesive strength between the films 12 and 13 is insufficient, which may cause the films 12 and 13 to peel off. If the thickness dimension L5 of the second adhesive layer 15 exceeds 4 μm, the rigidity of the composite film 10A increases due to the rigidity of the second adhesive layer 15, which may cause the composite film 10A to lose its flexibility, and the strength (rigidity) of the composite film 10A may become higher than necessary, causing the composite film 10A to become stiff and reducing the workability during processing such as bending, cutting, and tensioning. Since the thickness dimension L5 of the second adhesive layer 15 is within the above range, the films 12 and 13 can be firmly bonded together, preventing inadvertent peeling of the films 12 and 13, and allowing the composite film 10A to maintain appropriate strength (rigidity) and flexibility, thereby improving the workability during processing such as bending, cutting, and tensioning the composite film 10A.

[0047] FIG. 5 is a cross-sectional view of a composite film 10B as another example, similar to FIG. 2, and FIG. 6 is an exploded perspective view of the composite film 10B of FIG. 5. In FIGS. 5 and 6, the composite film 10B is partially shown, and the vertical direction is indicated by an arrow X, the horizontal direction is indicated by an arrow Y, and the thickness direction is indicated by an arrow Z. The composite film 10B shown in FIG. 5 is formed of a first synthetic resin film 11, a tin-deposited film 12, a printed film 13, a first adhesive layer 14, a second adhesive layer 15, and a UV-cutting agent layer 29. In the composite film 10B, the first synthetic resin film 11, the first adhesive layer 14, the tin-deposited film 12, the second adhesive layer 15, the UV-cutting agent layer 29, and the printed film 14 are arranged in this order in the thickness direction from one surface 16 (inner surface) to the other surface 17 (outer surface). The first synthetic resin film 11 and the thickness dimension L1 of the first synthetic resin film 11 are the same as those of the first synthetic resin film 11 shown in FIGS.

[0048] The tin-deposited film 12 is the same as that shown in Figs. 2 and 3, and is formed of a second synthetic resin film 18 made of a transparent thermoplastic synthetic resin and a colorless or colored silver tin-deposited layer 19, and is joined (fixed) to the outer surface 23 of the first synthetic resin film 11 via a first adhesive layer 14. The tin-deposited layer 19 is formed on the inner surface 20 of the second synthetic resin film 18. The tin-deposited layer 19 may be formed on the outer surface 21 of the second synthetic resin film 18. The tin-deposited film 12 has gloss or semi-gloss due to the colorless or colored silver tin-deposited layer 19, and has cosmetic properties that improve aesthetic appearance, as well as concealment properties that make it impossible to see from the other surface 17 (outer surface) of the composite film 10B to one surface 16 (inner surface).

[0049] On the inner surface 20 of the second synthetic resin film 18 on which the tin-deposited layer 19 is formed (the surface of the second synthetic resin film 18 on which tin is deposited), there are formed a formed portion 24 (present portion) where the tin-deposited layer 19 is formed, and a non-formed portion 25 (absent portion) where the tin-deposited layer 19 is not formed. In the non-formed portion 25 of the tin-deposited layer 19, microwaves are not reflected by the tin-deposited layer 19, and the microwaves can pass through the tin-deposited film 12 (second synthetic resin film 18) (see FIG. 4). Therefore, the composite film 10B shown in FIGS. 5 and 6 can reliably transmit microwaves, and the contents (object to be heated) located on one surface 16 (inner surface) of the composite film 10B can be heated by microwaves irradiated from the other surface 17 (outer surface) of the composite film 10B.

[0050] Furthermore, the tin-deposited film 12 having the absent portions 25 does not radiate radio waves in an irregular manner, the tin-deposited film 12 does not interfere with the radiation of radio waves, and the tin-deposited film 12 having the absent portions 25 (composite film 10B) does not block radio waves. Therefore, the composite film 10B shown in Figures 5 and 6 can radiate radio waves according to its radiation characteristics, and electronic data written in an IC tag 40 (electronic data storage medium) placed on one surface 16 (inner surface) of the composite film 10B can be read by an IC tag reader 50 (electronic data reading device) located on the other surface 17 (outer surface) of the composite film 10B.

[0051] The thickness dimension L2 of the tin-deposited film 12 is the same as that of the tin-deposited film 12 shown in Figures 2 and 3. The ratio of the formed portion 24 of the tin-deposited layer 19 to the unit area of ​​the second synthetic resin film 18 and the ratio of the non-formed portion 25 of the tin-deposited layer 19 to the unit area of ​​the second synthetic resin film 18 are the same as those of the second synthetic resin film 18 shown in Figures 2 and 3.

[0052] The printed film 13 is the same as that shown in Figs. 2 and 3, and is a transparent vapor-deposited film having gas barrier properties and water vapor barrier properties, and has a printed surface 26 (printed layer) on which a predetermined picture is printed. The printed film 13 is bonded (fixed) to the outer surface 28 of the tin vapor-deposited film 12 via a second adhesive layer 15. The thickness dimension L3 of the printed film 13 is the same as that of the printed film 13 shown in Figs. 2 and 3. The printed film 13 does not allow oxygen to pass through, so it can reliably prevent oxidation of the contained contents, and does not allow water vapor to pass through, so it can reliably prevent moisture from entering the contained contents.

[0053] The transparent first adhesive layer 14 is applied to either the outer surface 23 of the first synthetic resin film 11 or the inner surface 22 of the tin-deposited film 12, and bonds (adheres) the first synthetic resin film 11 and the tin-deposited film 12 together. The thickness dimension L4 of the first adhesive layer 14 is the same as that of the first adhesive layer 14 shown in Figures 2 and 3. The transparent second adhesive layer 15 is applied to either the outer surface 28 of the tin-deposited film 12 or the inner surface 27 of the printed film 13, and bonds (adheres) the tin-deposited film 12 and the printed film 13 together. The thickness dimension L5 of the second adhesive layer 15 is the same as that of the second adhesive layer 15 shown in Figures 2 and 3. The first adhesive layer 14 and the second adhesive layer 15 can firmly bond the films 11-13 to each other, preventing inadvertent peeling of the films 11-13, and allowing the composite film 10B to maintain appropriate strength (rigidity) and flexibility, thereby improving workability during processing such as bending, cutting, and tensioning the composite film 10B.

[0054] The UV cut-off agent layer 29 (ultraviolet absorbing film coating agent) is transparent and uses an ultraviolet absorbing group, blocking ultraviolet rays by cutting off approximately 100% of wavelengths of about 370 nm or less. A translucent or opaque agent may also be used as the UV cut-off agent layer 29. The UV cut-off agent layer 29 is applied to either the entire area of ​​the inner surface 27 of the printing film 13 (transparent vapor deposition film) or the entire area of ​​the second adhesive layer 15.

[0055] The UV cut-off agent layer 29 may be applied to either the second adhesive layer 15 or the outer surface 28 of the tin-deposited film 12, or the UV cut-off agent layer 29 may be applied to either the inner surface 22 of the tin-deposited film 12 or the first adhesive layer 14. When the UV cut-off agent layer 29 is applied to either the second adhesive layer 15 or the outer surface 28 of the tin-deposited film 12, the UV cut-off agent layer 29 is located directly above the tin-deposited film 12. When the UV cut-off agent layer 29 is applied to either the inner surface 22 of the tin-deposited film 12 or the first adhesive layer 14, the UV cut-off agent layer 29 is located directly below the tin-deposited film 12.

[0056] The thickness dimension L6 of the UV cut-off agent layer 29 is in the range of 2 to 4 μm, and preferably the thickness dimension L6 is 3 μm. If the thickness dimension L6 of the UV cut-off agent layer 29 is less than 2 μm, the thickness dimension L6 of the UV cut-off agent layer 29 is small and it may not be possible to reliably block ultraviolet rays. Since the thickness dimension L6 of the UV cut-off agent layer 29 is in the above range, ultraviolet rays can be reliably blocked in the packaging bag 30 or the microwave container 41.

[0057] Fig. 7 is a perspective view of a packaging bag 30 shown as an example made from the composite film 10A shown in Figs. 2 and 3 or the composite film 10B shown in Figs. 5 and 6, and Fig. 8 is a cross-sectional view taken along line BB in Fig. 7 when the packaging bag 30 is made from the composite film 10A in Figs. 2 and 3, and a partially enlarged view. Fig. 9 is a cross-sectional view taken along line BB in Fig. 7 and a partially enlarged view when the packaging bag 30 is made from the composite film 10B in Figs. 5 and 6, similar to Fig. 8.

[0058] The packaging bag 30 has an upper edge 31 (periphery) and a lower edge 32 (periphery) extending in the horizontal direction, side edges 33, 34 (periphery) extending in the vertical direction, and a storage space 35 surrounded by the upper and lower edges 31, 32 and the side edges 33, 34. The upper and lower edges 31, 32 and the side edges 33, 34 form a seal portion 36, and the storage space 35 is located (defined) inside the seal portion 36. Although not shown, the storage space 35 of the packaging bag 30 stores an object to be heated (retort food, frozen food, refrigerated food, face mask, or other food or product that requires heating). The side edges 33, 34 of the packaging bag 30 have notches 37 (cuts) formed therein.

[0059] The packaging bag 30 is made from a composite film 10A formed from a first synthetic resin film 11, a first adhesive layer 14, a tin-deposited film 12, a second adhesive layer 15, and a printed film 13, or made from a composite film 10B formed from a first synthetic resin film 11, a first adhesive layer 14, a tin-deposited film 12, a second adhesive layer 15, a UV-cutting agent layer 29, and a printed film 13. The packaging bag 30 is manufactured by a bag-making machine 38 (see FIG. 1), and is a four-sided sealed bag that is long in the vertical direction, with the upper and lower edge portions 31, 32 and both side edge portions 33, 34 of the overlapping composite film 10A or film 10B sealed. In the bag making machine 38, the composite film 10A or film 10B fed from the feed roll 39 is folded in half and three sides (three sides) are sealed (fused) by heat sealing or sonic sealing, and then the contents (object to be heated) are filled into the storage space 35 and the remaining side (one side) is sealed (fused). Note that the shape of the packaging bag 30 is not limited to that shown in the figure, and any shape having the storage space 35 can be adopted as the shape of the packaging bag 30.

[0060] In the packaging bag 30, the inner surface of the first synthetic resin film 11 forms the inner surface of the packaging bag 30, and the outer surface of the printed film 13 forms the outer surface of the packaging bag 30. In the packaging bag 30, the first synthetic resin films 11 (composite film 10A or film 10B) are overlapped with their inner surfaces facing each other, and the first synthetic resin films 11 are fused (thermally welded) to each other at seal portions 36 (upper and lower end edges 31, 32 and both side edges 33, 34 of the packaging bag 30). In the packaging bag 30, microwaves can pass through the tin-deposited film 12 at the non-formed portions 25 of the tin-deposited layer 19 of the tin-deposited film 12, and an item (object to be heated) contained in the storage space 35 of the packaging bag 30 can be heated by irradiating microwaves.

[0061] An IC tag 40 (RFID tag) equipped with an IC chip is attached to the upper edge 31 of the packaging bag 30. The IC chip of the IC tag 40 (electronic data storage medium) stores various data such as the specific number (identifier) ​​of the packaging bag 30, the product name and sales price of the product (object to be heated) stored in the storage space 35 of the packaging bag 30, the manufacturing date of the product, the expiration date of the product, the components of the product, the manufacturer and distributor of the product, etc. Each of these data is written into the IC chip of the IC tag 40 by an IC tag writer. The IC tag 40 attached to the packaging bag 30 is made of a material that does not burn in a microwave oven. Note that FIG. 7 illustrates a state in which the IC tag 40 (RFID tag) is attached to the upper edge 31 of the packaging bag 30, but the IC tag 40 does not have to be attached to the upper edge 31 of the packaging bag 30.

[0062] Fig. 10 is a perspective view of a microwave oven container 41 as an example using the composite film 10A shown in Figs. 2 and 3 or the composite film 10B shown in Figs. 5 and 6. The microwave oven container 41 (storage container) is formed of a container body 42 and a lid material 43 (lid film). The container body 42 is formed in a cup shape having a bottom wall 44, a peripheral wall 45, and an upper opening 46, and has a storage space 47 surrounded by the bottom wall 44 and the peripheral wall 45. A flange 48 is formed above the peripheral wall 45, extending radially outward from the container body 42. The container body 42 is made of a polyolefin thermoplastic resin such as polypropylene (PP), polyethylene (PE), or polystyrene (PS).

[0063] The lid material 43 (lid film) is made of a composite film 10A formed of the first synthetic resin film 11, the first adhesive layer 14, the tin-deposited film 12, the second adhesive layer 15, and the printed film 13, or is made of a composite film 10B formed of the first synthetic resin film 11, the first adhesive layer 14, the tin-deposited film 12, the second adhesive layer 15, the UV cut agent layer 29, and the printed film 13. After the storage space 47 of the container body 42 is filled with the contents (object to be heated), the first synthetic resin film 11 forming the lid material 43 is fused (thermally fused) to the flange 48 of the container body 42 to airtightly close the upper opening 46 of the container body 42.

[0064] An IC tag 40 (RFID tag) equipped with an IC chip is attached to the peripheral portion 49 of the cover material 43 (cover film). The IC chip of the IC tag 40 stores various data such as the specific number (identifier) ​​of the microwave container 41, the product name and sales price of the product (object to be heated) stored in the storage space 47 of the microwave container 41, the date of manufacture of the product, the expiration date of the product, the components of the product, the manufacturer and distributor of the product, etc. The IC tag 40 attached to the microwave container 41 is made of a material that does not burn in a microwave oven. Note that, although FIG. 10 illustrates a state in which the IC tag 40 (RFID tag) is attached to the peripheral portion 49 of the cover material 43 (cover film), the IC tag 40 does not have to be attached to the peripheral portion 49 of the cover material 43 (cover film).

[0065] In a microwave oven container 41 (storage container), the inner surface of the first synthetic resin film 11 forms the inner surface of a lid material 43 (lid film), and the outer surface of the printed film 13 forms the outer surface of the lid material 43. In the microwave oven container 41, microwaves can pass through the tin-deposited film 12 (lid material) 43 at non-forming portions 25 where the tin-deposited layer 19 of the tin-deposited film 12 is not formed, and an item (object to be heated) stored in a storage space 47 of the container body 41 can be heated by irradiating the microwaves.

[0066] The packaging bag 30 or the lid material 43 (lid film) of a microwave oven container 41 (storage container) made from the composite film 10A shown in Figures 2 and 3 or the composite film 10B shown in Figures 5 and 6 has a gloss or semi-gloss due to the tin-deposited film 12 having a colorless silver or colored silver tin-deposited layer 19, and the aesthetic appearance of the packaging bag 30 or the lid material 43 can be improved by the cosmetic properties of the tin-deposited film 12. The lid material 43 (lid film) of the packaging bag 30 or the microwave container 41 (storage container) has a formation portion 24 where the tin vapor deposition layer 19 is formed on the inner surface 20 (the surface where tin is vapor-deposited) of the second synthetic resin film 18, and the inner surface 20 of the second synthetic resin film 18 is covered with the tin vapor deposition layer 19 at the formation portion 24. Therefore, the concealing property of the tin vapor deposition film 12 having the tin vapor deposition layer 19 makes it impossible to see from the outer surface of the packaging bag 30 or the lid material 43 to the inner surface, thereby making it impossible to see the contents (object to be heated) from outside the packaging bag 30 or the lid material 43.

[0067] In the lid material 43 (lid film) of a packaging bag 30 or a microwave oven container 41 (storage container) made from the composite film 10A shown in Figures 2 and 3 or the composite film 10B shown in Figures 5 and 6, a non-forming portion 25 where the tin vapor deposition layer 19 is not formed is formed on the inner surface 20 (the surface where the tin is vapor-deposited) of the second synthetic resin film 18, and the surface of the second synthetic resin film 18 is exposed in the non-forming portion 25 while the second synthetic resin film 18 is directly opposed to the first synthetic resin film 11 and the printed film 13. Therefore, reflection of microwaves by the tin vapor deposition film 12 can be prevented in the non-forming portion 25, and microwaves radiated from a microwave oven can be transmitted through the non-forming portion 25 of the second synthetic resin film 18 where the tin vapor deposition layer 19 is not present. When an item (item to be heated) placed in the storage space 35, 47 of a packaging bag 30 or a microwave container 41 (storage container) made from the composite film 10A shown in Figures 2 and 3 or the composite film 10B shown in Figures 5 and 6 is heated in a microwave oven, the microwaves emitted from the microwave oven can pass through the tin vapor deposition film 12 (first synthetic resin film 11, printed film 13, first and second adhesive layers 14, 15, UV-cut agent layer 29), so that the item can be heated sufficiently and reliably in the microwave oven.

[0068] A packaging bag 30 or a lid material 43 (lid film) of a microwave container 41 (storage container) made from the composite film 10A shown in Figures 2 and 3 or the composite film 10B shown in Figures 5 and 6 has a UV-cutting agent layer 29 applied to either the inner surface 27 of the printed film 13 and the second adhesive layer 15, or either the second adhesive layer 15 and the outer surface 28 of the tin-deposited film 12, or either the inner surface 22 of the tin-deposited film 12 and the first adhesive layer 14, so that the packaging bag 30 or the lid material 43 has a barrier function against ultraviolet rays and can block ultraviolet rays, thereby preventing deterioration, changes in physical properties, and changes in taste of the contents (objects to be heated) stored in the storage spaces 35, 47 of the packaging bag 30 or the microwave container 41.

[0069] The lid material 43 (lid film) of the packaging bag 30 or the microwave container 41 (storage container) made from the composite film 10A shown in Figures 2 and 3 or the composite film 10B shown in Figures 5 and 6 uses a transparent vapor-deposited film having gas barrier properties as the printed film 13 and water vapor barrier properties, so that the packaging bag 30 and the lid material 43 do not allow oxygen to pass through, and the contents stored in the storage space 35, 47 of the packaging bag 30 or the microwave container 41 can be prevented from oxidizing, drying, or growing mold, and the packaging bag 30 and the lid material 43 do not allow water vapor to pass through, and can prevent the contents stored in the storage space 35, 47 of the packaging bag 30 or the microwave container 41 from becoming damp.

[0070] The composite film 10A shown in Figures 2 and 3 and the lid material 43 (lid film) of the packaging bag 30 or the microwave container 41 (storage container) made from the composite film 10A shown in Figures 5 and 6 have a predetermined graphic (printed layer) printed on the underside of a transparent vapor deposition film, so that the predetermined graphic can be seen from the outside of the packaging bag 30 or the lid material 43, and the image of the product (contents) stored in the storage space 35, 47 of the packaging bag 30 or the microwave container 41, the product logo, product name, product description, product advertising, the product selling price, the product manufacturer or distributor, the product manufacturing date, the product expiration date, the product's constituent ingredients, etc. can be confirmed.

[0071] 11 is a diagram showing an example of reading various data from the IC tag 40 of the packaging bag 30 or the microwave container 41 by an IC tag reader 50. Data stored in the IC chip of the IC tag 40 (RFID tag) attached to the packaging bag 30 or the microwave container 41 (container) is read by the IC tag reader 50 (electronic data reading device) connected to a cash register (POS register). In a lid material 43 (lid film) of a packaging bag 30 or a microwave container 41 (storage container) made from the composite film 10A shown in Figures 2 and 3 or the composite film 10B shown in Figures 5 and 6, the tin-deposited film 12 having the non-forming portion 25 where the tin-deposited layer 19 is not formed does not radiate radio waves in an irregular manner, and the radiation of radio waves is not impeded by the tin-deposited film 12. Therefore, radio waves are emitted from the IC tag 40 according to the radiation characteristics, and the tin-deposited film 12 having the non-forming portion 25 does not block the radio waves, enabling communication between the IC tag 40 and the IC tag reader 50, and enabling the IC tag reader 50 to smoothly read various data stored in the IC tag 40.

[0072] When a plurality of packaging bags 30 and a plurality of microwave containers 41 (containers) are displayed at a storefront and the packaging bags 30 and the microwave containers 41 are purchased, the purchaser brings the packaging bags 30 and the microwave containers 41 to a payment counter. At the payment counter, various data (identifiers of the packaging bags 30 or the microwave containers 41, product names and sales prices of the products (contained items) contained in the storage spaces 35, 47 of the packaging bags 30 or the microwave containers 41, the manufacturing dates of the products, the expiration dates of the products, the components of the products, the manufacturers and distributors of the products, etc.) written (stored) in the IC tags 40 attached to the packaging bags 30 or the microwave containers 41 are read by an IC tag reader 50. The various data read by the IC tag reader 50 are transmitted from the IC tag reader 50 to a cash register (POS register). The cash register (POS register) manages (tallys up) the inventory, inventory, sales, etc. of the packaging bags 30 and the microwave containers 41 based on the transmitted various data.

[0073] Even if an IC tag 40 is attached to a packaging bag 30 or a lid material 43 (lid film) of a microwave container 41 (storage container) made from the composite film 10A shown in Figures 2 and 3 or the composite film 10B shown in Figures 5 and 6, the tin-deposited film 12 having the non-forming portion 25 does not irradiate radio waves (radio wave jamming), preventing the IC tag 40 from malfunctioning, and the various data stored in the IC tag 40 can be smoothly read by the IC tag reader 50. In addition, the tin-deposited film 12 having the non-forming portion 25 does not block radio waves, enabling communication between the IC tag 40 and the IC tag reader 50, and the IC tag 40 can be used to manage inventory, stocktaking, sales, etc. in a centralized manner. [Explanation of symbols]

[0074] 10A Composite Film 10B Composite Film 11 First synthetic resin film 12 Tin-deposited film 13 Printing film 14 First adhesive layer 15 Second adhesive layer 16 One side (inner side) 17 The other side (outer side) 18 Second synthetic resin film 19 Tin deposition layer 20 Inner surface 21 Exterior 22 Inside 23 Exterior 24 Formation site 25 Non-formed site 26 Printing surface (printing layer) 27 Inner 28 Exterior 29 UV cut layer 30 packaging bags 31 Upper edge 32 Lower edge 33 Side edge 34 Side edge 35 Storage Space 36 Seal part 37 Notch 38 Bag making machine 39 Payout roll 40 IC tag (electronic data storage medium) 41 Microwave container (storage container) 42 Container body 43 Lid material (lid film) 44 Bottom wall 45 Peripheral wall 46 Top opening 47 Storage Space 48 Flange 49 Periphery 50 IC tag reader (electronic data reading device) L1~L6 thickness dimensions

Claims

1. a first synthetic resin film made of a thermoplastic synthetic resin; a tin-deposited film having a tin-deposited layer and bonded to an outer surface of the first synthetic resin film; a printed film having a printed surface on which a predetermined picture is printed and bonded to the outer surface of the tin-deposited film; a transparent first adhesive layer applied to either the first synthetic resin film or the tin-deposited film to bond the first synthetic resin film to the tin-deposited film; a transparent second adhesive layer applied to either the tin-deposited film or the printed film to bond the tin-deposited film to the printed film; and a UV cut agent layer for blocking ultraviolet rays, which is applied to either the printed film or the second adhesive layer, or to either the second adhesive layer or the tin-deposited film, or to either the tin-deposited film or the first adhesive layer, The tin-deposited film is formed from a second synthetic resin film made of a transparent thermoplastic synthetic resin, and the tin-deposited layer is deposited on either the inner surface or the outer surface of the second synthetic resin film, The tin-deposited film has a formed portion where the tin-deposited layer is formed and a non-formed portion where the tin-deposited layer is not formed on the tin-deposited surface of the second synthetic resin film, and the unit area (1 cm x 1 cm: 1 cm ２ The ratio of the area where the tin vapor deposition layer is formed to the unit area (1 cm x 1 cm: 1 cm) of the second synthetic resin film is in the range of 75 to 85%. ２ a ratio of a non-formed portion of the tin-deposited layer to the total surface area of ​​the tin-deposited film is in the range of 15 to 25%, a thickness of the tin-deposited film is in the range of 10 to 14 μm, and a thickness of the UV-cut agent layer is in the range of 2 to 4 μm; A composite film characterized in that in the formed portion, the surface of the second synthetic resin film is covered with the tin vapor deposition layer, and in the non-formed portion, the surface of the second synthetic resin film is exposed and the second synthetic resin film faces the first synthetic resin film or the printed film.

2. 2. The composite film according to claim 1, wherein microwaves can pass through the tin-deposited film, and wherein the composite film is formed of a container body made of a polyolefin-based thermoplastic resin and a lid material made of the composite film and covering the upper opening of the container body, with the first synthetic resin film forming the inner surface of the lid material and the printed film forming the outer surface of the lid material, and wherein contents contained in the container body of a microwave oven container can be heated by irradiation with microwaves, or wherein the composite film is formed of the composite film and has upper and lower edges extending laterally, both side edges extending vertically, and a storage space surrounded by the upper and lower edges and both side edges, with the first synthetic resin film forming the inner surface and the printed film forming the outer surface, and wherein contents contained in the storage space of a packaging bag can be heated by irradiation with microwaves.

3. The composite film according to claim 1 or claim 2, wherein the composite film allows radio waves to pass through the tin-deposited film, enabling communication between an electronic data reading device and an electronic data storage medium attached to the composite film.

4. 4. A composite film according to claim 1, wherein the tin-vapor-deposited layer is colorless silver or colored silver, and the tin-vapor-deposited film has a glossy or semi-glossy property that enhances aesthetic appearance, and a concealing property that makes it impossible to see from the outer surface to the inner surface.

5. 5. A composite film according to claim 1, wherein the printed film is a transparent vapor-deposited film having gas barrier properties and water vapor barrier properties, and the predetermined graphic is printed on the lower surface of the transparent vapor-deposited film.

6. 6. The composite film according to claim 1, wherein the thickness of the first synthetic resin film is in the range of 45 to 55 μm, and the thickness of the printed film is in the range of 10 to 14 μm.

7. 7. The composite film according to claim 1, wherein the thickness of the first and second adhesive layers is in the range of 2 to 4 μm.

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