JP7621065B2 - Composite Film - Google Patents

Description

The present invention relates to a composite film.

An aluminum vapor deposition film is disclosed that includes 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).

JP 2011-224921 A

The aluminum vapor deposition film disclosed in Patent Document 1 has a gloss or semi-glossy film due to the aluminum vapor deposition layer, and the aesthetic appearance of the film is improved by the cosmetic properties of the aluminum vapor deposition layer, while the concealing properties of the aluminum vapor deposition layer make it impossible to see from the outside to the inside of the film. However, when this aluminum vapor deposition 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 the diagram explaining the reflection of microwaves at the aluminum vapor deposition film layer in Figure 12, the microwaves radiated from the microwave oven are reflected by the aluminum vapor deposition layer, and as shown by arrow Z2 in Figure 12, the microwaves cannot pass through the aluminum vapor deposition film layer, and the microwaves do not reach the contents (objects to be heated), and the contents (objects to be heated) cannot be heated.

Furthermore, when IC tags are attached to 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 radiates radio waves in a random manner (radio 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; alternatively, the aluminum vapor deposition layer blocks radio waves, preventing communication between the IC tag and the IC tag reader, making it impossible to centrally manage inventory, stocktaking, sales, etc. using the IC tags.

The object of the present invention is to provide a composite film that has cosmetic properties to improve aesthetics, has concealing properties to make it impossible to see from the outside to the inside, 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 IC tag malfunctions, prevent the blocking of radio waves, and can use IC tags to centrally manage inventory, stocktaking, sales, etc.

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 one of the printed film and the second 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 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 tin-deposited film is formed from a unit area (1 cm x 1 cm: 1 cm) of the second synthetic resin film. ² ), the ratio of the areas where the tin vapor-deposited layer is formed to a unit area (1 cm x 1 cm: 1 cm ² ) of the second synthetic resin film is in the range of 75 to 85%, the ratio of the areas where the tin vapor-deposited layer is not formed to a unit area (1 cm x 1 cm: 1 cm 2 ) of the second synthetic resin film 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, and the thickness of the UV-cutting agent layer is in the range of 2 to 4 μm. In the areas where the tin vapor-deposited layer is formed, the surface of the second synthetic resin film is covered with the tin vapor-deposited layer, and in the areas where the UV-cutting agent is not formed, 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.

As an example of the composite film of the present invention, the composite film is capable of heating contents contained in the container body of a microwave oven container, which is formed from 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 a first synthetic resin film forming the inner surface of the lid material and a printed film forming the outer surface of the lid material, by irradiating microwaves; or , the composite film is capable of heating contents contained in the storage space of a packaging bag, which is made 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, by irradiating microwaves.

In another example of a composite film of the present invention, radio waves can pass through the tin-deposited film, enabling communication between an electronic data reader and an electronic data storage medium attached to the composite film.

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, which enhances the aesthetic appearance, and also has a concealing property that makes it impossible to see from the outside to the inside.

In another example of the composite film of the present invention, the printed film is a transparent vapor deposition film that has both gas barrier properties and water vapor barrier properties, and a specified image is printed on the underside of the transparent vapor deposition film.

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

In another example of the composite film of the present invention, the thickness dimensions of the first and second adhesive layers are in the range of 2 to 4 μm.

According to the composite film of the present invention, the composite film is formed from 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 with a predetermined picture and bonded to the outer surface of the tin-deposited film, and the tin-deposited film gives the composite film a gloss or semi-gloss, and the aesthetic properties of the tin-deposited film can improve the aesthetics of the composite film, and the concealment properties of the tin-deposited film can make it impossible to see one side (inner side) from the other side (outer side), and the tin-deposited film can transmit microwaves without reflecting them. 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 this composite film, the tin-deposited film does not irradiate 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. In addition, the tin-deposited film does not block radio waves, allowing communication between the IC tag and the IC tag reader, and the IC tag can be used to centrally manage inventory, stocktaking, sales, etc.

Microwaves can pass through the tin-deposited film, and an item placed in a packaging bag or storage container made from the composite film can be heated by irradiating it with microwaves. 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 the item (item to be heated) can be reliably heated in the microwave oven.

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, the tin-deposited film does not radiate radio waves indiscriminately, 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; the tin-deposited film 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, and allowing centralized management of inventory, stocktaking, sales, etc., using electronic data storage media such as IC tags.

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 has a tin vapor deposition film and first and second adhesive layers that do not reflect microwaves, so that the contents (objects to be heated) filled in a packaging bag or storage container made from the composite film can be sufficiently heated in a microwave oven, and even if an IC tag is attached to a packaging bag or storage container made from the composite film, the tin vapor deposition film and first and second adhesive layers do 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 deposition film and first and second adhesive layers do 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.

A composite film including a UV-cutting agent layer that provides a barrier against 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 barrier function against ultraviolet rays due to the UV-cutting agent layer (transparent UV-cutting agent layer, translucent UV-cutting agent layer, opaque UV-cutting agent layer) and can cut ultraviolet rays, thereby preventing deterioration and changes in the physical properties and taste of the contents filled in the packaging bag or storage container produced thereby. The composite film has a tin vapor deposition film and a UV cut agent layer that do not reflect microwaves, so that the contents (objects to be heated) filled in a packaging bag or storage container made from the composite film can be sufficiently heated in a microwave oven, and even if an IC tag is attached to a packaging bag or storage container made from the composite film, the tin vapor deposition film and the UV cut agent layer do 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 deposition film and the UV cut agent layer do 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.

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 has a gloss or semi-gloss due to the tin-deposited layer deposited on either the inner or outer surface of the second synthetic resin film, and the aesthetic properties of the tin-deposited layer can improve the aesthetic feel of the composite film. The concealing properties of the tin-deposited layer make it impossible to see one surface (inner surface) from the other surface (outer surface), and the tin-deposited layer does not reflect microwaves but allows microwaves to pass through. When a package bag or container made from the composite film contains an item (object to be heated) and the item is heated in a microwave oven, the composite film allows microwaves radiated from the microwave oven to pass through, 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 deposition layer does not irradiate radio waves, 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 deposition 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.

A composite film in which 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, the surface of the second synthetic resin film is covered with a tin-deposited layer in the formed portion, and the surface of the second synthetic resin film is exposed in the non-formed portion while the second synthetic resin film faces the first synthetic resin film or the printed film, can transmit microwaves radiated from a microwave oven in the non-formed portion of the second synthetic resin film where no tin-deposited layer is formed, and therefore, a package made of the composite film can be used. When the contents (objects to be heated) filled in a packaging bag or container are heated in a microwave oven, the contents (objects to be heated) can be sufficiently heated in the microwave oven, and even if an IC tag is attached to a packaging bag or container made of the composite film, the tin vapor deposition 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 deposition 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 composite film has a gloss or semi-gloss due to the tin vapor deposition layer at the formation site, the aesthetic properties of the tin vapor deposition layer can improve the aesthetic appearance of the composite film, and the concealment properties of the tin vapor deposition layer can make it impossible to see one side (inner side) of the composite film from the other side (outer side).

In a composite film in which the ratio of the areas where the tin vapor-deposited layer is formed to the unit area of the second synthetic resin film is in the range of 75 to 85 % and the ratio of the areas where the tin vapor-deposited layer is not formed to the unit area of the second synthetic resin film is in the range of 15 to 25%, the ratio of the areas where the tin vapor-deposited layer is formed to the unit area of the second synthetic resin film is in the above range, so that the tin vapor-deposited layer at the areas where the tin vapor-deposited layer is formed can impart gloss or semi-gloss to the composite film, and the aesthetic appearance of the composite film can be improved by the aesthetic properties of the tin vapor-deposited layer at the areas where the tin vapor-deposited layer is formed in the above ratio, and the concealing property of the tin vapor-deposited layer at the areas where the tin vapor-deposited layer is formed in the above ratio can make it impossible to see one surface (inner surface) of the composite film from the other surface (outer surface). In the composite film, the ratio of the non-formed portions of the tin vapor-deposited layer to the unit area of the second synthetic resin film is within the above-mentioned range, and microwaves radiated from a microwave oven can be reliably transmitted through the non-formed portions of the above-mentioned 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, and the like in a centralized manner.

A composite film in which the tin vapor deposition layer is colorless silver or colored silver, and the tin vapor deposition film has a glossy or semi-glossy cosmetic property that enhances the aesthetic appearance, and has a concealing property that makes one side (inner side) invisible from the other side (outer side), can impart gloss or semi-gloss to the composite film because the tin vapor deposition layer is colorless silver or colored silver, and the aesthetic appearance of the composite film can be improved by the cosmetic property of the tin vapor deposition layer, while the concealing property of the tin vapor deposition 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.

The printed film is a transparent vapor deposition film that has both gas barrier properties and water vapor barrier properties, and the composite film on which a specified image is printed on the underside of the transparent vapor deposition film uses a transparent vapor deposition film that has both gas barrier properties and water vapor barrier properties as the printed film, which prevents oxygen from passing 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 prevents moisture from entering the contents (object to be heated) filled in a packaging bag or storage container made of the composite film, which does not allow water vapor to pass through.

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 vapor deposition 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, the stiffness of the 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 vapor deposition film is in the above range, the tin vapor deposition film can impart gloss or semi-gloss to the composite film, and the aesthetic properties of the tin vapor deposition film can improve the aesthetic feel of the composite film, while the concealment properties of the tin vapor deposition film make it impossible to see one side (inner surface) of the composite film from the other side (outer surface), making it impossible to see the contents from the outside. Because the thickness of the printed film is within the above range, the composite film 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 does not allow water vapor to pass through, and can reliably prevent moisture from entering the contents filled in a packaging bag or storage container made of the composite film.

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 thicknesses of the first and second adhesive layers are in the above range, so that the films can be firmly bonded together and inadvertent peeling of the films can be prevented. Since the thickness of the UV cut agent layer of the composite film is in the above range, it can reliably block ultraviolet rays and prevent deterioration, changes in the physical properties, and changes in taste of the contents filled in a packaging bag or storage container made of the composite film.

FIG. 2 is a perspective view of an example composite film. 2 is a cross-sectional view taken along line AA in FIG. 1 . FIG. 3 is an exploded perspective view of the composite film of FIG. 2 . FIG. 2 is a diagram illustrating microwave transmission through a tin-deposited film. 3 is a cross-sectional view similar to FIG. 2 taken along the arrows of a composite film shown as another example. FIG. FIG. 6 is an exploded perspective view of the composite film of FIG. 5 . 7 is a perspective view of an example of a packaging bag made from the composite film shown in FIGS. 2 and 3 or the composite film shown in FIGS. 8 is a cross-sectional view taken along line BB in FIG. 7 when a packaging bag is made from the composite film of FIGS. 9 is a cross-sectional view taken along the line A-A of FIG. 8 when a packaging bag is made of the composite film of FIG. FIG. 7 is a perspective view of a microwave oven container as an example using the composite film shown in FIGS. 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. FIG. 2 is a diagram illustrating the reflection of microwaves at an aluminum vapor-deposited film layer.

The composite film according to the present invention will be described in detail below with reference to the attached drawings such as FIG. 1, which shows an oblique view of composite films 10A and 10B as an example. FIG. 2 is a cross-sectional view taken along line A-A in FIG. 1, and FIG. 3 is an exploded oblique view of composite film 10A in FIG. 2. FIG. 4 is a diagram explaining the transmission of microwaves through tin-deposited film 12. FIG. 1 shows composite film 10A or composite film 10B wound around pay-out roll 30. FIGS. 2 and 3 partially show composite film 10A, with the vertical direction indicated by arrow X, the horizontal direction indicated by arrow Y, and the thickness direction indicated by arrow Z.

As shown in Figures 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 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 PP are used as the thermoplastic synthetic resin to make the first synthetic resin film 11.

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 will be low and the stiffness of the first synthetic resin film 11 will be weakened, causing twisting and sagging of the composite film 10A, which may reduce the workability of processing the composite film 10A, such as bending, cutting, and tensioning. 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 will be higher than necessary, and the composite film 10A will be stiff, which may reduce the workability of processing the composite film 10A, such as bending, cutting, and tensioning. Because the thickness dimension L1 of the first synthetic resin film 11 is within the above range, the composite film 10A has a predetermined optimal strength, and can prevent the composite film 10A from twisting, sagging, or becoming stiff, improving workability during processing of the composite film 10A.

The tin vapor deposition film 12 is formed of a second synthetic resin film 18 and a tin vapor deposition layer 19. The tin vapor deposition layer 19 is formed on the inner surface 20 of the second synthetic resin film 18 and is located directly below the second synthetic resin film 18. Alternatively, the tin vapor deposition layer 19 may be formed on the outer surface 21 of the second synthetic resin film 18 and the tin vapor deposition layer 19 may be located directly above the second synthetic resin film 18. The tin vapor deposition 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 bonded (fixed) to the outer surface 23 of the first synthetic resin film 11 via the first adhesive layer 14.

The second synthetic resin film 18 is a stretched film made by stretching a raw material (unstretched film) of a transparent thermoplastic synthetic resin. The second synthetic resin film 18 may also 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 of the second synthetic resin film 18 on which the tin vapor-deposited layer 19 is formed (the surface of the second synthetic resin film 18 on which tin is vapor-deposited) 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 or colored silver tin-vapor-deposited layer 19, and has cosmetic properties that enhance the aesthetic sense, as well as concealment properties that make it impossible to see one side 16 (inner side) from the other side 17 (outer side) of the composite film 10A.

In the formation portion 24 where the tin vapor deposition layer 19 of the second synthetic resin film 18 is formed, the inner surface 20 of the second synthetic resin film 18 is covered by the tin vapor deposition layer 19, and the second synthetic resin film 18 is covered by the colorless silver or colored silver tin vapor deposition layer 19. In the non-formation portion 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 portions 24 (between the tin vapor deposition 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 deposition layer 19 is formed on the outer surface (face) of the second synthetic resin film 18, in the non-formation portion 25, the outer surface (face) of the second synthetic resin film 18 is exposed between the formation portions 24 (between the tin vapor deposition 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.

As shown by the arrow Z1 in FIG. 3, in the tin-deposited film 12, the microwaves irradiated to the tin-deposited film 12 are reflected at the 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 the 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 the contents (objects to be heated) located on one side 16 (inner surface) of the composite film 10A can be heated by microwaves irradiated from the other side 17 (outer surface) of the composite film 10A.

In addition, the tin-deposited film 12 having the non-existent portions 25 does not radiate radio waves in a random manner, the tin-deposited film 12 does not interfere with the radiation of radio waves, and the tin-deposited film 12 having the non-existent 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 the IC tag 40 (electronic data storage medium) placed on one side 16 (inner surface) of the composite film 10A can be read by the IC tag reader 50 (electronic data reading device) located on the other side 17 (outer surface) of the composite film 10A.

The thickness dimension L2 of the tin vapor deposition 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 vapor deposition film 12 is less than 10 μm, the thickness dimension of the tin vapor deposition layer 19 becomes small, the tin vapor deposition film 12 cannot impart gloss or semi-gloss to the composite film 10A, the cosmetic properties of the tin vapor deposition film 12 decrease, the aesthetic appearance of the composite film 10A cannot be improved, and the concealment properties of the tin vapor deposition film 12 decrease, making it impossible to make one surface 16 (inner surface) of the composite film 10A invisible from the other surface 17 (outer surface). 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.

The ratio of the formed portions 24 of the tin-deposited layer 19 to the unit area (1 cm×1 cm: 1 cm ² ) of the second synthetic resin film 18 is in the range of 75 to 85 %. The ratio of the non-formed portions 25 of the tin-deposited layer 19 to the unit area (1 cm×1 cm: 1 cm ² ) of the second synthetic resin film 18 is in the range of 15 to 25%. If the ratio of the formed portions 24 of the tin-deposited layer 19 is less than 75% and the ratio of the non-formed portions 25 of the tin-deposited layer 19 exceeds 25%, the formed portions 24 become less than necessary, and the tin-deposited film 12 cannot impart gloss or semi-gloss to the composite film 10A, the aesthetic value of the tin-deposited film 12 decreases, the aesthetic appearance of the composite film 10A cannot be improved, and the concealment property of the tin-deposited film 12 decreases, making it impossible to make the 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 proportion of the formed portions 24 of the tin-deposited layer 19 exceeds 85 % and the proportion of the non-formed portions 25 of the tin-deposited layer 19 is less than 15 %, the number of formed portions 24 will be greater than necessary, and the tin-deposited layer 19 will account for 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).

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

Furthermore, microwaves are not reflected by the tin vapor deposition layer 19, and can pass through the tin vapor deposition film 12 (composite film 10A). Therefore, the composite film 10A shown in Figures 2 and 3 can reliably transmit microwaves. Furthermore, the tin vapor deposition film 12 (composite film 10A) does not diffusely reflect radio waves, so the tin vapor deposition film 12 does not interfere with the radiation of radio waves, and the tin vapor deposition 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.

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

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 deposition film (printed film 13). The graphic may include an image of the product (content) contained in the storage space 35, 47 of the packaging bag 30 or the 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 constituent ingredient, etc. The printed film 13 overlaps the tin vapor deposition film 12 with its inner surface 27 facing the outer surface 28 (tin vapor deposition layer 19) of the tin vapor deposition film 12, and is bonded (fixed) to the outer surface 28 of the tin vapor deposition film 12 via the second adhesive layer 15.

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 it is possible to reliably prevent oxidation of the contents, and it is possible to reliably prevent moisture from the contents without allowing water vapor to pass through.

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 and 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 dimension L4 in the range of 2 to 4 μm, and preferably has a thickness dimension L4 of 3 μm.

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 vapor deposition film 12 cannot be firmly bonded, and the adhesive strength between the films 11 and 12 is insufficient, which may cause the films 11 and 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 may increase 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 and 12 can be firmly bonded to each other, preventing inadvertent peeling of the films 11 and 12, and allowing the composite film 10A to maintain appropriate strength (rigidity) and flexibility, improving workability during processing such as bending, cutting, and tensioning the composite film 10A.

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 together. 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, preferably 3 μm.

If the thickness dimension L5 of the second adhesive layer 15 is less than 2 μm, the tin vapor deposition film 12 and the printed film 13 cannot be firmly bonded, 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 to each other, preventing inadvertent peeling of the films 12 and 13, and allowing the composite film 10A to maintain appropriate strength (rigidity) and flexibility, improving the workability during processing such as bending, cutting, and tensioning the composite film 10A.

Figure 5 is an arrow cross-sectional view of a composite film 10B shown as another example, similar to Figure 2, and Figure 6 is an exploded perspective view of the composite film 10B of Figure 5. In Figures 5 and 6, the composite film 10B is partially shown, and the vertical direction is indicated by arrow X, the horizontal direction is indicated by arrow Y, and the thickness direction is indicated by arrow Z. The composite film 10B shown in Figure 5 is formed from a first synthetic resin film 11, a tin vapor deposition film 12, a printed film 13, a first adhesive layer 14, a second adhesive layer 15, and a UV cut agent layer 29. In the composite film 10B, the first synthetic resin film 11 → the first adhesive layer 14 → the tin vapor deposition film 12 → the second adhesive layer 15 → the UV cut agent layer 29 → the printed film 14 are arranged in the thickness direction from one surface 16 (inner surface) to the other surface 17 (outer surface) in this order. 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 Figures 2 and 3.

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 bonded (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 a cosmetic property that improves the aesthetic sense, as well as a concealing property that makes it impossible to see from the other surface 17 (outer surface) of the composite film 10B to one surface 16 (inner surface).

On the inner surface 20 of the second synthetic resin film 18 on which the tin vapor deposition layer 19 is formed (the surface of the second synthetic resin film 18 on which tin is vapor-deposited), a formed portion 24 (present portion) where the tin vapor deposition layer 19 is formed and a non-formed portion 25 (absent portion) where the tin vapor deposition layer 19 is not formed are formed. In the non-formed portion 25 of the tin vapor deposition layer 19, the microwave is not reflected by the tin vapor deposition layer 19, and the microwave can pass through the tin vapor deposition 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 (objects to be heated) located on one side 16 (inner surface) of the composite film 10B can be heated by microwaves irradiated from the other side 17 (outer surface) of the composite film 10B.

Furthermore, the tin-deposited film 12 having the non-existent portion 25 does not radiate radio waves in a random manner, the tin-deposited film 12 does not interfere with the radiation of radio waves, and the tin-deposited film 12 having the non-existent portion 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 the IC tag 40 (electronic data storage medium) placed on one side 16 (inner surface) of the composite film 10B can be read by the IC tag reader 50 (electronic data reading device) located on the other side 17 (outer surface) of the composite film 10B.

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

The printed film 13 is the same as that shown in Figs. 2 and 3, and is a transparent vapor deposition film that has gas barrier properties as well as water vapor barrier properties, and has a printed surface 26 (printed layer) on which a predetermined image is printed. The printed film 13 is bonded (fixed) to the outer surface 28 of the tin vapor deposition 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 contents, and does not allow water vapor to pass through, so it can reliably prevent moisture from entering the contents.

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. 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. 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 firmly bond the films 11-13 together, preventing inadvertent peeling of the films 11-13, and allowing the composite film 10B to retain appropriate strength (rigidity) and flexibility, improving workability during processing such as bending, cutting, and tensioning the composite film 10B.

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

The UV cut 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 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 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 agent layer 29 is located directly above the tin-deposited film 12. When the UV cut 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 agent layer 29 is located directly below the tin-deposited film 12.

The thickness dimension L6 of the UV cut 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 agent layer 29 is less than 2 μm, the thickness dimension L6 of the UV cut 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 agent layer 29 is in the above range, ultraviolet rays can be reliably blocked in the packaging bag 30 or the microwave container 41.

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

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 side edges 33, 34. The upper and lower edges 31, 32 and 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). Notches 37 (cuts) are formed in the side edges 33, 34 of the packaging bag 30.

The packaging bag 30 is made of 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 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 cut 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 and has 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 that has a storage space 35 can be used as the shape of the packaging bag 30.

In the packaging bag 30, the inner surface of the first synthetic resin film 11 constitutes the inner surface of the packaging bag 30, and the outer surface of the printed film 13 constitutes 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 the inner surfaces of the first synthetic resin films 11 facing each other, and the first synthetic resin films 11 are fused (thermally welded) to each other at the 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 the contents (heated objects) contained in the storage space 35 of the packaging bag 30 can be heated by irradiating microwaves.

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 (heating object) stored in the storage space 35 of the packaging bag 30, 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. 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 material that does not burn in a microwave oven. Note that FIG. 7 shows the 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.

Figure 10 is a perspective view of a microwave oven container 41 as an example using the composite film 10A shown in Figures 2 and 3 or the composite film 10B shown in Figures 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-based thermoplastic resin such as polypropylene (PP), polyethylene (PE), or polystyrene (PS).

The lid material 43 (lid film) is made of a composite film 10A formed from a first synthetic resin film 11, a first adhesive layer 14, a tin vapor deposition film 12, a second adhesive layer 15, and a printed film 13, or a composite film 10B formed from a first synthetic resin film 11, a first adhesive layer 14, a tin vapor deposition film 12, a second adhesive layer 15, a UV cut agent layer 29, and a printed film 13. After the contents (objects to be heated) are filled into the storage space 47 of the container body 42, the first synthetic resin film 11 forming the lid material 43 is fused (heat fused) to the flange 48 of the container body 42, airtightly sealing the upper opening 46 of the container body 42.

An IC tag 40 (RFID tag) equipped with an IC chip is attached to the peripheral portion 49 of the lid material 43 (lid 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 (heating object) 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 FIG. 10 shows the state in which the IC tag 40 (RFID tag) is attached to the peripheral portion 49 of the lid material 43 (lid film), but the IC tag 40 does not have to be attached to the peripheral portion 49 of the lid material 43 (lid film).

In the microwave container 41 (storage container), the inner surface of the first synthetic resin film 11 forms the inner surface of the 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 container 41, microwaves can pass through the tin-deposited film 12 (lid material) 43 at the non-forming portion 25 where the tin-deposited layer 19 of the tin-deposited film 12 is not formed, and the contents (object to be heated) contained in the storage space 47 of the container body 41 can be heated by irradiating the microwaves.

The 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 has a gloss or semi-gloss appearance due to the tin-deposited film 12 having a colorless silver or colored silver tin-deposited layer 19, and the aesthetic properties of the tin-deposited film 12 can improve the aesthetic appearance of the packaging bag 30 or the lid material 43. The lid material 43 (lid film) of the packaging bag 30 or the microwave container 41 (storage container) has a formation area 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 area 24. Therefore, the concealment of the tin vapor deposition film 12 having the tin vapor deposition layer 19 makes it impossible to see the inner surface of the packaging bag 30 or the lid material 43 from the outer surface, thereby making it impossible to see the contents (object to be heated) from outside the packaging bag 30 or the lid material 43.

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 a package bag 30 or a storage space 35, 47 of a microwave oven container 41 (storage container) made of 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 the contents can be heated sufficiently and reliably in the microwave oven.

The packaging bag 30 or the lid material 43 (lid film) of 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 has a UV cut agent layer 29 applied to either the inner surface 27 of the printed film 13 and the second adhesive layer 15, or the second adhesive layer 15 and the outer surface 28 of the tin vapor deposition film 12, or the inner surface 22 of the tin vapor deposition 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 cut ultraviolet rays, thereby preventing deterioration, changes in physical properties, and changes in taste of the contents (heated objects) stored in the storage spaces 35 and 47 of the packaging bag 30 or the microwave container 41.

The composite film 10A shown in Figs. 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 10B shown in Figs. 5 and 6 use a transparent deposition film that has gas barrier properties and water vapor barrier properties as the printed film 13, so 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 mold growth. The packaging bag 30 and the lid material 43 do not allow water vapor 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 becoming damp.

The composite film 10A shown in Figures 2 and 3 and the lid material 43 (lid film) of the packaging bag 30 or 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 microwave container 41, the product logo, product name, product description, product advertising, product selling price, product manufacturer or distributor, product manufacturing date, product expiration date, product constituents, etc. can be confirmed.

Figure 11 is a diagram showing an example of reading various data from the IC tag 40 of the packaging bag 30 or microwave container 41 by an IC tag reader 50. The data stored in the IC chip of the IC tag 40 (RFID tag) attached to the packaging bag 30 or microwave container 41 (storage container) is read by the IC tag reader 50 (electronic data reading device) connected to a cash register (POS register). In the case of 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, the tin-deposited film 12 having the non-formed portion 25 where the tin-deposited layer 19 is not formed does not radiate radio waves in a random manner, and the tin-deposited film 12 does not interfere with the radiation of radio waves. Therefore, radio waves are emitted from the IC tag 40 according to the radiation characteristics, and the tin-deposited film 12 having the non-formed portion 25 does not block the radio waves, enabling communication between the IC tag 40 and the IC tag reader 50, and allowing the IC tag reader 50 to smoothly read various data stored in the IC tag 40.

When multiple packaging bags 30 and multiple microwave containers 41 (containers) are lined up at a storefront and the purchaser purchases the packaging bags 30 and the microwave containers 41, the purchaser brings the packaging bags 30 and the microwave containers 41 to the payment counter. At the payment counter, the IC tag reader 50 reads various data (identifier of the packaging bag 30 or the microwave container 41, product name and sales price of the product (content) contained in the storage space 35, 47 of the packaging bag 30 or the microwave container 41, date of manufacture of the product, expiration date of the product, components of the product, manufacturer and distributor of the product, etc.) written (stored) in the IC tag 40 attached to the packaging bag 30 or the microwave container 41. The various data read by the IC tag reader 50 is transmitted from the IC tag reader 50 to the cash register (POS register). The cash register (POS register) manages (tallys up) the inventory, stocktaking, sales, etc. of the packaging bags 30 and microwave containers 41 based on the various data transmitted.

Even if an IC tag 40 is attached to the lid material 43 (lid film) of the packaging bag 30 or 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 interference), preventing the IC tag 40 from malfunctioning, and the IC tag reader 50 can smoothly read various data stored in the IC tag 40. 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. The IC tag 40 can be used to centrally manage inventory, stocktaking, sales, etc.

10A Composite film 10B Composite film 11 First synthetic resin film 12 Tin vapor deposition film 13 Printed film 14 First adhesive layer 15 Second adhesive layer 16 One surface (inner surface)
17. The other side (outer side)
18 Second synthetic resin film 19 Tin vapor deposition layer 20 Inner surface (surface)
21 Outer surface 22 Inner surface 23 Outer surface 24 Formed area 25 Non-formed area 26 Printed surface (printed layer)
27 Inner surface 28 Outer surface 29 UV cut agent layer 30 Packaging bag 31 Upper edge 32 Lower edge 33 Side edge 34 Side edge 35 Storage space 36 Sealed portion 37 Notch 38 Bag making machine 39 Feed-out 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 Upper opening 47 Storage space 48 Flange 49 Peripheral edge 50 IC tag reader (electronic data reading device)
L1 to L6 thickness dimensions

Claims (7)

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-vapor-deposited film has a formed portion where the tin-vapor-deposited layer is formed and a non-formed portion where the tin-vapor-deposited layer is not formed on the tin-vapor-deposited surface of the second synthetic resin film, the ratio of the formed portion of the tin-vapor-deposited layer to a unit area (1 cm x 1 cm: 1 cm ² ) of the second synthetic resin film is in a range of 75 to 85%, the ratio of the non-formed portion of the tin-vapor-deposited layer to a unit area (1 cm x 1 cm: 1 cm ² ) of the second synthetic resin film is in a range of 15 to 25%, the thickness of the tin-vapor-deposited film is in a range of 10 to 14 μm, and the thickness of the UV-cut agent layer is in a 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 while the second synthetic resin film faces the first synthetic resin film or the printed film. 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. The composite film according to claim 1 or 2, wherein radio waves can pass through the tin-deposited film, and communication is possible between an electronic data reading device and an electronic data storage medium attached to the composite film. 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. A composite film according to claim 1 , wherein the printed film is a transparent vapor-deposited film having both 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. 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. 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.

Images