JP7557950B2 - 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 the above-mentioned Patent Document 1 has a 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 packaging bag or a storage container, and the contents (objects to be heated) filled in the packaging bag or storage container 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 11, the microwaves radiated from the microwave oven are reflected by the aluminum vapor deposition layer, and as shown by the arrow Z2 in Figure 11, 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 packaging bags or containers 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, changes in physical properties, and changes in taste. Another object of the present invention is to provide a composite film that can prevent IC tags from malfunctioning, can prevent radio waves from being blocked, 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 is formed from a synthetic resin film made of a thermoplastic synthetic resin, a tin-deposited film on which tin is deposited and which is bonded to an outer surface of the synthetic resin film, a first adhesive layer located between the synthetic resin film and the tin-deposited film to bond the synthetic resin film to the tin-deposited film, and a UV cut-off agent layer which is applied to the tin-deposited film and is located between the tin-deposited film and the first adhesive layer, or which is applied to the synthetic resin film and is located between the synthetic resin film and the first adhesive layer, and which serves as a barrier against ultraviolet rays. The tin-deposited film is formed from a transparent deposited film having gas barrier properties and water vapor barrier properties, and a tin-deposited layer deposited on an inner surface or an outer surface of the transparent deposited film, and 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 inner surface or the outer surface of the transparent deposited film on which tin is deposited, and the tin-deposited film has a unit area (1 cm x 1 cm: 1 cm2) of the transparent deposited film ^. the ratio of the areas where the tin-deposited layer is formed to a unit area (1 cm × 1 cm: 1 cm 2 ) of the transparent vapor-deposited film is in the range of 75 to 85%, the ratio of the areas where the tin-deposited layer is not formed to a unit area (1 cm × 1 cm: 1 cm ² ) of the transparent vapor-deposited film is in the range of 15 to 25%, and the thickness of the tin-deposited film is in the range of 10 to 14 μm. In the areas where the tin-deposited layer is formed, the inner or outer surface of the transparent vapor-deposited film is covered with the tin-deposited layer, and in the areas where the tin-deposited layer is not formed, the inner or outer surface of the transparent vapor-deposited film faces the synthetic resin film while being exposed .

One example of the composite film of the present invention includes a printed layer having a printed surface with a predetermined image printed thereon and bonded to the outer surface of the tin-deposited film, and a second adhesive layer positioned between the tin-deposited film and the printed layer to bond the tin-deposited film and the printed layer.

As another example of the composite film of the present invention, the composite film allows microwaves to pass through the tin-deposited film, and is capable of heating contents contained in the storage space of a packaging bag made of the composite film and having 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 a first synthetic resin film forming the inner surface and a printed layer forming the outer surface, or is capable of heating contents contained in the container body of a microwave oven container formed of a container body made of a polyolefin-based thermoplastic resin and a lid material made of the composite film that covers the upper opening of the container body, with the first synthetic resin film forming the inner surface of the lid material and the printed layer forming the outer surface of the lid material, with contents contained in the container body being heatable by microwave irradiation.

In another example of a composite film of the present invention, radio waves can pass through the tin-deposited film, and electronic data written to an electronic data storage medium placed on the inner surface side of the tin-deposited film can be read by an electronic data reader located on the outer surface side of the composite film.

In another example of the composite film of the present invention, the tin vapor deposition layer is colorless silver or colored silver, and the tin vapor deposition film has a glossy or semi-glossy appearance, improving the aesthetic appearance, and also has a concealing property that makes it impossible to see one side of the composite film from the other side.

In another example of a composite film of the present invention, the thickness of the synthetic resin film is in the range of 45 to 55 μm, and the thickness of the printing layer is in the range of 18 to 22 μm.

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

According to the composite film of the present invention, the composite film is formed of a synthetic resin film made of a thermoplastic synthetic resin, a tin-deposited film on which tin is deposited and which is bonded to the outer surface of the synthetic resin film, and a first adhesive layer which is located between the synthetic resin film and the tin-deposited film and bonds the synthetic resin film to the tin-deposited film. 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 aesthetic appearance of the composite film. The concealing properties of the tin-deposited film can make it impossible to see one side (inner surface) of the composite film from the other side (outer surface), 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.

A composite film formed of a transparent vapor-deposited film in which the tin vapor-deposited film has gas barrier properties and water vapor barrier properties, and a tin vapor-deposited layer deposited on the inner or outer surface of the transparent vapor-deposited film, has gas barrier properties and water vapor barrier properties, so that the transparent vapor-deposited film forming the tin vapor-deposited film does not allow oxygen to pass through, preventing oxidation of the contents located on the inner surface of the composite film, and does not allow water vapor to pass through, preventing moisture from entering the contents located on the inner surface of the composite film. The composite film has a gloss or semi-gloss due to the tin vapor-deposited layer forming the tin vapor-deposited film, the aesthetic properties of the tin vapor-deposited layer can improve the aesthetic feel of the composite film, the concealing properties of the tin vapor-deposited layer can make it impossible to see one surface (inner surface) of the composite film from the other surface (outer surface), and the tin vapor-deposited film can transmit microwaves without reflecting them.

A composite film including a printed layer having a printed surface with a predetermined graphic printed thereon and bonded to the outer surface of a tin-deposited film, and a second adhesive layer located between the tin-deposited film and the printed layer and bonding the tin-deposited film and the printed layer, has a printed layer having a printed surface with a predetermined graphic (printed layer) bonded to the outer surface of the tin-deposited film, so that the predetermined graphic can be seen from the outside of the composite film, and the image of the contents (product) located on the inner surface of the composite film, 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.

Microwaves can pass through the tin-deposited film, and contents located on the inner side of the composite film can be heated by microwaves irradiated from the outer side of the composite film. When an item (object 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 (object to be heated) can be reliably heated in the microwave oven.

A composite film in which radio waves can pass through and electronic data written to an electronic data storage medium placed on the inner surface of the tin-deposited film can be read by an electronic data reading device placed on the outer surface of the composite film, the tin-deposited film does not radiate radio waves in a random manner, preventing malfunction of electronic data storage media such as IC tags, and various data stored in electronic data storage media such as IC tags can be smoothly read by an electronic data reading device such as an IC tag reader, and 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 electronic data storage media such as IC tags can be used to centrally manage inventory, stocktaking, sales, etc.

A composite film including a UV-cutting agent layer that blocks ultraviolet rays, the UV-cutting agent layer being applied to a tin-deposited film and positioned between the tin-deposited film and the first adhesive layer, or the UV-cutting agent layer being applied to a synthetic resin film and positioned between the synthetic resin film and 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 block ultraviolet rays, thereby preventing deterioration and changes in the physical properties and taste of the contents filled in the packaging bag or storage container made therewith. 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 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. 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 a tin-deposited film has a formed portion where a tin-deposited layer is formed on the inner or outer surface of the transparent vapor-deposited film where tin is deposited, and a non-formed portion where no tin-deposited layer is formed, in which the inner or outer surface of the transparent vapor-deposited film is covered with a tin-deposited layer at the formed portion and in which the inner or outer surface of the transparent vapor-deposited film is exposed at the non-formed portion and the transparent vapor-deposited film faces a synthetic resin film, can transmit microwaves radiated from a microwave oven at the non-formed portion of the transparent vapor-deposited film where no tin-deposited layer is formed, and therefore a packaging bag or container made of the composite film can be used. When the contents (objects to be heated) filled in the 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 transparent vapor deposition film 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 transparent vapor deposition film 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 feel 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 transparent vapor-deposited 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 transparent vapor-deposited 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 transparent vapor-deposited 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 transparent vapor-deposited 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 centrally manage inventory, stocktaking, sales, and the like.

A composite film in which the tin vapor deposition layer is colorless silver or colored silver, the tin vapor deposition film has gloss or semi-gloss properties that enhance the aesthetic appearance, and has concealing properties that make one side of the composite film invisible from the other 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 properties of the tin vapor deposition layer, while the concealing properties of the tin vapor deposition layer make it impossible to see one side (inner side) of the composite film 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.

A composite film in which the thickness dimension of the synthetic resin film is in the range of 45 to 55 μm, the thickness dimension of the tin vapor deposition film is in the range of 10 to 14 μm, and the thickness dimension of the printed layer is in the range of 18 to 22 μm, has a predetermined strength because the thickness dimension of the synthetic resin film is in the above range, and the stiffness of the packaging bag or storage container made of the composite film is strong, and can prevent the packaging bag or storage container 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. Furthermore, because the thickness of the tin vapor deposition film, including the transparent vapor deposition film, is within the above range, it does not allow oxygen to pass through, and it is possible to reliably prevent oxidation of the contents filled in the packaging bag or storage container made of the composite film, and it does not allow water vapor to pass through, and it is possible to reliably prevent moisture from entering the contents filled in the packaging bag or storage container made of the composite film.

In a composite film in which the thickness dimensions 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 first adhesive layer can firmly bond the synthetic resin film and the tin vapor deposition film, and the second adhesive layer can firmly bond the tin vapor deposition film and the printing layer, preventing inadvertent peeling between the films and between the film and the printing layer. 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 can prevent deterioration, changes in 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 cross-sectional view taken along line BB in FIG. 1 . FIG. 5 is an exploded perspective view of the composite film of FIG. 4 . FIG. 2 is a diagram illustrating microwave transmission through a tin-deposited film. FIG. 1 is a perspective view of a packaging bag shown as an example. 8 is a cross-sectional view taken along line CC in FIG. 7 and a partially enlarged view. FIG. 2 is a perspective view of an example microwave container. 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 is a perspective view of the composite films 10A and 10B shown as an example. FIG. 2 is a cross-sectional view taken along line A-A in FIG. 1, and FIG. 3 is an exploded perspective view of the composite film 10A in FIG. 2. FIG. 4 is a cross-sectional view taken along line B-B in FIG. 1, and FIG. 5 is an exploded perspective view of the composite film 10B in FIG. 4. FIG. 6 is a diagram for explaining the transmission of microwaves through the tin-deposited film 12. FIG. 1 shows the composite film 10A and the printed film 26 wound around the pay-out rolls 28a and 28b. In FIG. 2 to FIG. 5, the composite films 10A and 10B are partially shown, with the vertical direction indicated by the arrow X, the horizontal direction indicated by the arrow Y, and the thickness direction indicated by the arrow Z.

As shown in Figures 2 and 3, the composite film 10A is formed from a synthetic resin film 11, a tin-deposited film 12 (discontinuous tin-deposited film), a first adhesive layer 13, and a UV-cutting agent layer 14. In the composite film 10A, the synthetic resin film 11, the first adhesive layer 13, the UV-cutting agent layer 14, and the tin-deposited film 12 are arranged in the thickness direction from one surface 15 (inner surface) to the other surface 16 (outer surface). The 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 resins used to make the synthetic resin film 11.

The thickness dimension L1 of the 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 synthetic resin film 11 is less than 45 μm, the strength of the synthetic resin film 11 will be reduced and the stiffness of the synthetic resin film 11 will be weakened, causing twisting and sagging of the composite film 10A (including composite film 10B) containing the synthetic resin film 11, which may reduce the workability of the composite film 10A (including composite film 10B) during processing such as bending, cutting, and tensioning. If the thickness dimension L1 of the synthetic resin film 11 exceeds 55 μm, the strength (rigidity) of the synthetic resin film 11 will be higher than necessary, and the composite film 10A (including composite film 10B) containing the synthetic resin film 11 will be stiff, which may reduce the workability of the composite film 10A (including composite film 10B) during processing such as bending, cutting, and tensioning. Since the thickness dimension L1 of the synthetic resin film 11 is within the above range, the composite film 10A (including composite film 10B) has a predetermined optimal strength, and can prevent the composite film 10A (including composite film 10B) from twisting, sagging, or stiffening, thereby improving the workability of the composite film 10A (including composite film 10B) during processing.

The first adhesive layer 13 is applied to either the outer surface 17 of the synthetic resin film 11 or the UV cut agent layer 14, and is located between the synthetic resin film 11 and the tin vapor deposition film 12 (UV cut agent layer 14) to bond (adhere) the synthetic resin film 11 and the tin vapor deposition film 12 (UV cut agent layer 14). In FIG. 2, the first adhesive layer 13 is applied to the entire synthetic resin film 11 or the entire UV cut agent layer 14, but the first adhesive layer 13 may be applied intermittently (partially) to the outer surface 17 of the synthetic resin film 11 or the UV cut agent layer 14. The first adhesive layer 13 is transparent and has a thickness dimension L2 in the range of 2 to 4 μm, preferably 3 μm.

If the thickness dimension L2 of the first adhesive layer 13 is less than 2 μm, the synthetic resin film 11 and the tin vapor deposition film 12 (UV cut agent layer 14) 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 L2 of the first adhesive layer 13 exceeds 4 μm, the rigidity of the first adhesive layer 13 may increase the rigidity of the composite film 10A (including composite film 10B), which may cause the composite film 10A (including composite film 10B) to lose its flexibility, and the strength (rigidity) of the composite film 10A (including composite film 10B) may become higher than necessary, which may cause the composite film 10A (including composite film 10B) to become stiff, which may reduce workability during processing such as bending, cutting, and tension. Because the thickness dimension L2 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 (including composite film 10B) to maintain appropriate strength (rigidity) and flexibility, improving workability during processing such as bending, cutting, and tensioning the composite film 10A (including composite film 10B).

The UV cut agent layer 14 (ultraviolet absorbing film coating agent) is transparent and uses an ultraviolet absorbing group, and blocks ultraviolet rays by cutting off approximately 100% of wavelengths of about 370 nm or less. A translucent or opaque one can also be used as the UV cut agent layer 14. The UV cut agent layer 14 is applied to the entire inner surface 12 of the tin vapor deposition film 12 and is located between the tin vapor deposition film 12 and the first adhesive layer 13. The UV cut agent layer 14 is located directly below the tin vapor deposition film 12. The UV cut agent layer 14 may be applied to the entire outer surface 17 of the synthetic resin film 11 and is located between the synthetic resin film 11 and the first adhesive layer 13. When the UV cut agent layer 14 is applied to the outer surface 17 of the synthetic resin film 11, the UV cut agent layer 14 is located directly above the synthetic resin film 11. In addition, the UV cut agent layer 14 may not be formed on the composite film 10A.

The thickness dimension L3 of the UV cut agent layer 14 is in the range of 2 to 4 μm, and preferably the thickness dimension L3 is 3 μm. If the thickness dimension L3 of the UV cut agent layer 14 is less than 2 μm, the thickness dimension L3 of the UV cut agent layer 14 is small and it may not be possible to reliably cut ultraviolet rays. Since the thickness dimension L3 of the UV cut agent layer 14 is in the above range, ultraviolet rays are blocked in the composite film 10A (including composite film 10B), and ultraviolet rays are reliably cut in the composite film 10A (including composite film 10B).

The tin vapor deposition film 12 is formed from a transparent vapor deposition film 19 and a tin vapor deposition layer 21 vapor-deposited on the inner surface 20 of the transparent vapor deposition film 19. The transparent vapor deposition film 19 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 deposition barrier layer (alumina, silicon oxide, etc.) and a coating barrier layer are laminated on the upper surface of the base film (PET or PP). The transparent vapor deposition film has gas barrier properties as well as water vapor barrier properties.

The tin vapor deposition layer 21 is formed on the inner surface 20 of the transparent vapor deposition film 19 and is located directly below the transparent vapor deposition film 19. The tin vapor deposition layer 21 may be vapor-deposited on the outer surface 22 of the transparent vapor deposition film 19, and the tin vapor deposition layer 21 may be located directly above the transparent vapor deposition film 19. The tin vapor deposition film 12 overlaps the outer surface 17 of the synthetic resin film 11 with its inner surface 18 (inner surface 20 of the transparent vapor deposition film 19) facing the outer surface 17 of the synthetic resin film 11, and is bonded (fixed) to the outer surface 17 of the synthetic resin film 11 via the first adhesive layer 13.

The tin vapor deposition layer 21 is colorless silver or colored silver. The inner surface 18 of the tin vapor deposition film 12 on which the tin vapor deposition layer 21 is formed (the surface of the transparent vapor deposition film 12 on which tin is vapor deposited) has a formed portion 23 (a portion where the tin vapor deposition layer 21 is present) where the tin vapor deposition layer 21 is formed, and a non-formed portion 24 (a portion where the tin vapor deposition layer 21 is absent) where the tin vapor deposition layer 21 is not formed. The tin vapor deposition film 12 has gloss or semi-gloss due to the colorless silver or colored silver tin vapor deposition layer 21, and has cosmetic properties that improve aesthetic appearance, as well as concealment properties that make it impossible to see from the other surface 16 (outer surface) of the composite film 10A (including the composite film 10B) to one surface 15 (inner surface).

In the formation portion 23 where the tin deposition layer 21 of the tin deposition film 12 (transparent deposition film 19) is formed, the inner surface 20 of the transparent deposition film 19 is covered with the tin deposition layer 21, and the transparent deposition film 19 is covered with the colorless silver or colored silver tin deposition layer 21. In the non-formation portion 24 of the tin deposition film 12 (transparent deposition film 19), the inner surface 20 of the transparent deposition film 19 is exposed between the formation portions 23 (between the tin deposition layers 21), and the inner surface 18 of the transparent deposition film 12 and the outer surface 17 of the synthetic resin film 11 directly face each other. When the tin deposition layer 21 is formed on the outer surface 22 of the transparent deposition film 19, in the non-formation portion 24, the outer surface 22 of the transparent deposition film 19 is exposed between the formation portions 23 (between the tin deposition layers 21), and the inner surface 18 of the transparent deposition film 12 and the outer surface 17 of the synthetic resin film 11 directly face each other.

In the tin-deposited film 12, as shown by the arrow Z1 in FIG. 6, the microwaves irradiated to the outer surface 25 of the tin-deposited film 12 are reflected at the portion 23 where the tin-deposited layer 21 is formed, and cannot pass through the tin-deposited film 12 (transparent vapor-deposited film 19). However, in the portion 24 where the tin-deposited layer 21 is not formed, the tin-deposited layer 21 is not present, and the microwaves are not reflected by the tin-deposited layer 21, and pass through the tin-deposited film 12 (transparent vapor-deposited film 19). 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 15 (inner surface) of the composite film 10A can be heated by microwaves irradiated from the other side 16 (outer surface) of the composite film 10A.

The tin-deposited film 12 (transparent deposited film 19) having the non-existent portion 24 does not radiate radio waves randomly, 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 24 (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 41 (electronic data storage medium) placed on one side 15 (inner surface) of the composite film 10A can be read by the IC tag reader 51 (electronic data reading device) located on the other side 16 (outer surface) of the composite film 10A.

The thickness dimension L4 of the tin-deposited film 12 is in the range of 10 to 14 μm, and preferably the thickness dimension L4 is 12 μm. If the thickness dimension L4 of the tin-deposited film 12 is less than 10 μm, the thickness dimension of the tin-deposited layer 21 becomes small, the tin-deposited film 12 cannot impart gloss or semi-gloss to the composite film 10A (including the composite film 10B), the cosmetic properties of the tin-deposited film 12 decrease, the aesthetic appearance of the composite film 10A (including the composite film 10B) cannot be improved, and the hiding property of the tin-deposited film 12 decreases, making it impossible to make one surface 15 (inner surface) of the composite film 10A (including the composite film 10B) invisible from the other surface 16 (outer surface).
Furthermore, oxygen may permeate the tin-deposited film 12 (composite films 10A, 10B) and cause oxidation of the contents stored in the storage spaces 35, 48 of the packaging bag 30 or microwave oven container 42 made from the composite film 10B, and water vapor may permeate the tin-deposited film 12 (composite films 10A, 10B) and cause dampness of the contents stored in the storage spaces 35, 48 of the packaging bag 30 or microwave oven container 42 made from the composite film 10B. Since the thickness dimension L4 of the tin-deposited film 12 is within the above range, it does not allow oxygen to permeate and can reliably prevent oxidation of the contents, and it does not allow water vapor to permeate and can reliably prevent dampness of the contents.

If the thickness dimension L4 of the tin-deposited film 12 exceeds 14 μm, the thickness dimension of the tin-deposited layer 21 will be larger than necessary, and the microwaves will be reflected by the tin-deposited layer 21, preventing the microwaves from passing through the tin-deposited film 12 (composite films 10A, 10B). 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 formed portions 23 of the tin-deposited layer 21 to a unit area (1 cm×1 cm: 1 ^cm2 ) of the transparent deposited film 19 is in the range of 75 to 85 %. The ratio of non-formed portions 24 of the tin-deposited layer 21 to a unit area (1 cm×1 cm: 1 ^cm2 ) of the transparent deposited film 19 is in the range of 15 to 25%. If the proportion of formed portions 23 of the tin vapor-deposited layer 21 is less than 75% and the proportion of non-formed portions 24 of the tin vapor-deposited layer 21 exceeds 25%, the number of formed portions 23 will be smaller than necessary, the tin vapor-deposited film 12 will not be able to impart gloss or semi-gloss to the composite film 10A (including composite film 10B), the cosmetic properties of the tin vapor-deposited film 12 will be reduced, the aesthetic appearance of the composite film 10A (including composite film 10B) will not be improved, and the hiding property of the tin vapor-deposited film 12 will be reduced, making it impossible to make one surface 15 (inner surface) of the composite film 10A (including composite film 10B) invisible from the other surface 16 (outer surface).

If the proportion of the formed portions 23 of the tin-deposited layer 21 exceeds 85 % and the proportion of the non-formed portions 24 of the tin-deposited layer 21 is less than 15 %, the number of formed portions 23 will be greater than necessary, and the tin-deposited layer 21 will account for the majority of the unit area of the transparent vapor-deposited film 12. As a result, microwaves will be reflected by the tin-deposited film 12 (tin-deposited layer 21), preventing the microwaves from passing through the tin-deposited film 12 (composite films 10A, 10B), and radio waves may be blocked by the tin-deposited film 12 (tin-deposited layer 21).

The thickness dimension L4 of the tin vapor deposition film 12 is within the above range, the ratio of the formed portion 23 of the tin vapor deposition layer 21 to the unit area of the transparent vapor deposition film 19 is within the above range, and the ratio of the non-formed portion 24 of the tin vapor deposition layer 21 to the unit area of the transparent vapor deposition film 19 is within the above range, so that the tin vapor deposition film 12 can impart gloss or semi-gloss to the composite film 10A (including composite film 10B), and the aesthetic properties of the tin vapor deposition film 12 can improve the aesthetic appearance of the composite film 10A (including composite film 10B), and the concealing properties of the tin vapor deposition film 12 make it impossible to see one side 15 (inner surface) of the composite film 10A (including composite film 10B) from the other side 16 (outer surface), thereby making it impossible to see the contents of the composite film 10A (including composite film 10B) from the outside.

Furthermore, microwaves are not reflected by the tin vapor deposition layer 21, and microwaves can pass through the tin vapor deposition film 12 (composite films 10A, 10B). Therefore, the composite film 10A shown in Figures 2 and 3 (including the composite film 10B shown in Figures 4 and 5) can reliably pass microwaves. Furthermore, the tin vapor deposition film 12 (composite films 10A, 10B) 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 films 10A, 10B) having the non-formed portion 24 does not block radio waves. Therefore, the composite film 10A shown in Figures 2 and 3 (including the composite film 10B shown in Figures 4 and 5) can radiate radio waves according to the radiation characteristics.

The composite film 10B shown in Figures 4 and 5 is formed from a synthetic resin film 11, a tin-deposited film 12 (tin discontinuous deposition film), a printed film 26 (printed layer), a first adhesive layer 13, a second adhesive layer 27, and a UV cut agent layer 14. In the composite film 10B, the synthetic resin film 11, the first adhesive layer 13, the UV cut agent layer 14, the tin-deposited film 12, the second adhesive layer 27, and the printed film 26 (printed layer) are arranged in the thickness direction from one surface 15 (inner surface) to the other surface 16 (outer surface). As shown in Figure 1, the composite film 10A unwound from the unwind roll 28a and the printed film 26 unwound from the unwind roll 28b are joined together to produce the composite film 10B shown in Figure 5.

The synthetic resin film 11 and the thickness dimension L1 of the synthetic resin film 11 are the same as those of the synthetic resin film 11 shown in Figures 2 and 3. The transparent first adhesive layer 13 is applied to either the outer surface 17 of the synthetic resin film 11 or the UV cut agent layer 14, and bonds (adheres) the synthetic resin film 11 and the tin vapor deposition film 12. The thickness dimension L2 of the first adhesive layer 13 is the same as that of the first adhesive layer 13 shown in Figures 2 and 3. The UV cut agent layer 14 is applied to the inner surface 18 of the tin vapor deposition film 12 and is located between the tin vapor deposition film 12 and the first adhesive layer 13. The thickness dimension L3 of the UV cut agent layer 14 is the same as that of the UV cut agent layer 14 shown in Figures 2 and 3. The UV cut agent layer 14 does not have to be formed on the composite film 10B.

The tin vapor deposition film 12 is the same as that shown in Figs. 2 and 3, and is formed of a transparent vapor deposition film 19 having gas barrier properties and water vapor barrier properties, and a tin vapor deposition layer 21 vapor-deposited on the inner surface 20 of the transparent vapor deposition film 19, and is bonded (fixed) to the outer surface 17 of the synthetic resin film 11 via a first adhesive layer 13. The tin vapor deposition layer 21 may be formed on the outer surface 22 of the transparent vapor deposition film 19. The tin vapor deposition film 12 has gloss or semi-gloss due to the colorless silver or colored silver tin vapor deposition layer 21, and has cosmetic properties that improve aesthetic appearance, as well as concealment properties that make it impossible to see from the other surface 16 (outer surface) of the composite film 10B to one surface 15 (inner surface).

On the inner surface 20 of the transparent vapor deposition film 19 on which the tin vapor deposition layer 21 is formed (the surface of the transparent vapor deposition film 12 on which tin is vapor-deposited), there are formed a formed portion 23 (present portion) where the tin vapor deposition layer 21 is formed, and a non-formed portion 24 (absent portion) where the tin vapor deposition layer 21 is not formed. In the non-formed portion 24 of the tin vapor deposition layer 21, the microwave is not reflected by the tin vapor deposition layer 21, and the microwave can pass through the tin vapor deposition film 12 (transparent vapor deposition film 19) (see FIG. 6). 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 15 (inner surface) of the composite film 10B can be heated by microwaves irradiated from the other side 16 (outer surface) of the composite film 10B.

Furthermore, the tin-deposited film 12 having the non-existent portions 24 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 24 (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 41 (electronic data storage medium) placed on one side 15 (inner surface) of the composite film 10B can be read by an IC tag reader 51 (electronic data reading device) located on the other side 16 (outer surface) of the composite film 10B.

The thickness dimension L4 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 area where the tin vapor-deposited layer 21 is formed to the unit area of the transparent vapor-deposited film 19 and the ratio of the area where the tin vapor-deposited layer 21 is not formed to the unit area of the transparent vapor-deposited film 19 are the same as those of the transparent vapor-deposited film 12 shown in Figures 2 and 3.

The second adhesive layer 27 is applied to either the outer surface 25 of the tin-deposited film 12 or the inner surface 29 of the printed film 26 (printed layer), and bonds (adheres) the tin-deposited film 12 and the printed film 26. In FIG. 4, the second adhesive layer 27 is applied to the entire outer surface 25 of the tin-deposited film 12 or the entire inner surface 29 of the printed film 26, but the second adhesive layer 27 may be applied intermittently (partially) to the outer surface 25 of the tin-deposited film 12 or the inner surface 29 of the printed film 26. The second adhesive layer 27 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 27 is less than 2 μm, the tin vapor deposition film 12 and the printed film 26 cannot be firmly bonded, and the adhesive strength between the films 12 and 26 is insufficient, which may cause the films 12 and 26 to peel off. If the thickness dimension L5 of the second adhesive layer 27 exceeds 4 μm, the rigidity of the composite film 10B increases due to the rigidity of the second adhesive layer 27, which may cause the composite film 10B to lose its flexibility, and the strength (rigidity) of the composite film 10B may become higher than necessary, causing the composite film 10B 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 27 is within the above range, the films 12 and 26 can be firmly bonded to each other, preventing inadvertent peeling of the films 12 and 26, and allowing the composite film 10B to maintain appropriate strength (rigidity) and flexibility, improving the workability during processing such as bending, cutting, and tensioning the composite film 10B.

The printed film 26 (printed layer) is a stretched film made by stretching a roll of thermoplastic synthetic resin (unstretched film). Various types of PE and PP are used as the thermoplastic synthetic resin used to make the printed film 26. The printed layer can also be printed paper with a printed surface on which a specified image is printed, or printed nonwoven fabric with a printed surface on which a specified image is printed. The printed film 26 (printed layer) has a thickness dimension L6 in the range of 18 to 22 μm, and preferably has a thickness dimension L6 of 20 μm.

The printed film 26 has a printed surface on which a predetermined graphic is printed. The predetermined graphic is printed on the inner surface 29 of the printed film 26. The graphic may include an image of the product (content) contained in the storage space 35, 48 of the packaging bag 30 or the microwave container 42 (storage container) described below, a product logo, a product name, a product description, a product advertisement, the product's selling price, the product's manufacturer or distributor, the product's manufacturing date, the product's expiration date, the product's constituent ingredients, etc. The printed film 26 overlaps the tin-deposited film 12 with its inner surface 29 facing the outer surface 25 of the tin-deposited film 12, and is bonded (fixed) to the outer surface 25 of the tin-deposited film 12 via the second adhesive layer 27.

The composite film 10A shown in Figures 2 and 3 and the composite film 10B shown in Figures 4 and 5 are formed from a synthetic resin film 11 made of a thermoplastic synthetic resin, a tin-deposited film 12 having a colorless silver or colored silver tin-deposited layer 21 and bonded to the outer surface 17 of the synthetic resin film 11, and a first adhesive layer 13 located between the synthetic resin film 11 and the tin-deposited film 12 to bond the synthetic resin film 11 and the tin-deposited film 12, and the tin-deposited layer 21 can impart gloss or semi-gloss to the composite films 10A and 10B. The aesthetic properties of the tin vapor deposition layer 21 can improve the aesthetic appearance of the composite films 10A, 10B. The composite films 10A, 10B have the formation portion 23 where the tin vapor deposition layer 21 is formed on the inner surface 20 (the surface where tin is vapor deposited) of the transparent vapor deposition film 19, and the inner surface 20 of the transparent vapor deposition film 19 is covered with the tin vapor deposition layer 21 at the formation portion 23. Therefore, the concealment properties of the tin vapor deposition film 12 can make it impossible to see one surface 15 (inner surface) of the composite films 10A, 10B from the other surface 16 (outer surface).

In the composite film 10A shown in FIGS. 2 and 3 and the composite film 10B shown in FIGS. 4 and 5, the tin-deposited film 12 has a formed portion 23 where a tin-deposited layer 21 is formed and a non-formed portion 24 where the tin-deposited layer 21 is not formed on the inner surface 20 (or outer surface 22) of the transparent vapor-deposited film 19 where tin is vapor-deposited, and the ratio of the formed portion 23 of the tin-deposited layer 21 to the unit area of the transparent vapor-deposited film 19 is in the range of 75 to 85 %, and the ratio of the non-formed portion 24 of the tin-deposited layer 21 to the unit area of the transparent vapor-deposited film 19 is in the range of 15 to 20 %. 25%, microwaves can be transmitted through non-formation areas 24 of the transparent vapor-deposited film 19 where the tin vapor-deposited layer 21 is not formed, the tin vapor-deposited film 12 does not reflect microwaves, and the contents (object to be heated) placed on one side 15 (inner surface) of the composite films 10A, 10B can be reliably heated by microwaves irradiated from the other side 16 (outer surface) of the composite films 10A, 10B.

In the composite film 10A shown in Figures 2 and 3 and the composite film 10B shown in Figures 4 and 5, the transparent vapor-deposited film 12 having the non-formed portion 24 where the tin vapor-deposited layer 21 is not formed does not radiate radio waves in an irregular manner, and can prevent malfunction of an electronic data storage medium such as an IC tag 41 arranged on the inner surface 18 side of the tin vapor-deposited film 12. Various data stored in an electronic data storage medium such as an IC tag 41 can be smoothly read by an electronic data reading device such as an IC tag reader 51. In addition, the tin vapor-deposited film 12 does not block radio waves, and communication between the electronic data storage medium such as the IC tag 41 and the electronic data reading device such as the IC tag reader 51 is possible. Electronic data storage media such as the IC tag 41 can be used to centrally manage inventory, stocktaking, sales, etc.

In the composite film 10A shown in Figures 2 and 3 and the composite film 10B shown in Figures 4 and 5, the transparent vapor deposition film 19 forming the tin vapor deposition film 12 has gas barrier properties as well as water vapor barrier properties, so the tin vapor deposition film 12 does not allow oxygen to pass through, preventing oxidation of contents placed on one side 15 (inner surface) of the composite films 10A and 10B, and the tin vapor deposition film 12 does not allow water vapor to pass through, preventing moisture from entering the contents placed on one side 15 (inner surface) of the composite films 10A and 10B.

In the composite film 10B shown in Figures 4 and 5, a printed film 26 (printed layer) having a printed surface on which a specified graphic (printed layer) is printed is bonded to the outer surface 25 of the tin-deposited film 12, so that the specified graphic can be seen from the outside of the composite film 10B, and the image of the contents (product) located on one side 15 (inner surface) of the composite film 10B, the product logo, product name, product description, product advertisement, product selling price, product manufacturer or distributor, product manufacturing date, product expiration date, product constituents, etc. can be confirmed.

Figure 7 is a perspective view of a packaging bag 30 shown as an example made of a composite film 10B including a composite film 10A, and Figure 8 is a cross-sectional view along the line C-C in Figure 7 and a partially enlarged view. 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). Notches 37 (cuts) are formed on both side edges 33, 34 of the packaging bag 30.

The packaging bag 30 is made of a composite film 10B formed of a synthetic resin film 11, a tin-deposited film 12 (discontinuous tin-deposited film), a printed film 26 (printed layer), a first adhesive layer 13, a second adhesive layer 27, and a UV-cutting agent layer 14. The packaging bag 30 is manufactured by a bag-making machine 38 (see FIG. 1), and is a vertically long four-sided sealed bag in which the upper and lower edge portions 31, 32 and both side edge portions 33, 34 of the overlapping composite film 10B are sealed.

In the bag making machine 38, the composite film 10A unwound from the unwinding roll 28a and the printed film 26 unwound from the unwinding roll 28b are joined together to make the composite film 10B, which is then folded in half and three sides (three sides) are sealed (fused) by heat sealing or sonic sealing, after which the contents (object to be heated) are filled into the storage space 35 and the remaining side (one side) is sealed (fused). The shape of the packaging bag 30 is not limited to that shown in the figure, and any shape having a storage space 35 can be used as the shape of the packaging bag 30.

In the packaging bag 30, the inner surface 39 of the synthetic resin film 11 constitutes the inner surface (one surface 15) of the packaging bag 30, and the outer surface 40 of the printed film 26 constitutes the outer surface (the other surface 16) of the packaging bag 30. In the packaging bag 30, the synthetic resin films 11 (composite films 10B) overlap with the inner surfaces 39 of the synthetic resin films 11 facing each other, and the 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 230). In the packaging bag 30, microwaves can pass through the tin-deposited film 12 at the non-formed portions 24 of the tin-deposited layer 21 of the tin-deposited film 12, and microwaves are irradiated to the contents (heated object) contained in the storage space 35 of the packaging bag 30. The packaging bag 30 is stored in a microwave oven, and the contents (heated object) are heated by the microwave oven.

An IC tag 41 (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 41 (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 41 by an IC tag writer. The IC tag 41 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 41 does not have to be attached to the upper edge 31 of the packaging bag 30.

Figure 9 is a perspective view of a microwave oven container 42 as an example using a composite film 10B including a composite film 10A. The microwave oven container 42 (storage container) is formed of a container body 43 and a lid material 44 (lid film). The container body 43 is formed in a cup shape having a bottom wall 45, a peripheral wall 46, and an upper opening 47, and has a storage space 48 surrounded by the bottom wall 45 and the peripheral wall 46. A flange 49 is formed above the peripheral wall 46, extending radially outward from the container body 43. The container body 43 is made of a polyolefin-based thermoplastic resin such as polypropylene (PP), polyethylene (PE), or polystyrene (PS).

The lid material 44 (lid film) is made of a composite film 10B formed of a synthetic resin film 11, a tin-deposited film 12 (discontinuous tin-deposited film), a printed film 26 (printed layer), a first adhesive layer 13, a second adhesive layer 27, and a UV cut agent layer 14. After the contents (objects to be heated) are filled into the storage space 48 of the container body 43, the synthetic resin film 11 forming the lid material 44 is fused (heat-sealed) to the flange 49 of the container body 43, airtightly sealing the upper opening 47 of the container body 43.

In the microwave container 42 (storage container), the inner surface 39 of the synthetic resin film 11 forms the inner surface (one side 15) of the lid material 44 (lid film), and the outer surface 40 of the printed film 26 forms the outer surface (the other side 16) of the lid material 44. In the microwave container 42, microwaves can pass through the tin-deposited film 12 (lid material 44) at the non-formation portion 24 where the tin-deposited layer 21 of the tin-deposited film 12 is not formed, and microwaves are irradiated onto the contents (object to be heated) contained in the storage space 48 of the container body 43.

An IC tag 41 (RFID tag) equipped with an IC chip is attached to the peripheral portion 50 of the lid material 44 (lid film). The IC chip of the IC tag 41 stores various data such as the specific number (identifier) of the microwave container 42 (storage container), the product name and sales price of the product (heating object) stored in the storage space 48 of the microwave container 42, 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 41 attached to the microwave container 42 is made of a material that does not burn in a microwave oven. Note that FIG. 9 shows the state in which the IC tag 41 (RFID tag) is attached to the peripheral portion 50 of the lid material 44 (lid film), but the IC tag 41 does not have to be attached to the peripheral portion 50 of the lid material 44 (lid film).

The lid material 44 (lid film) of a packaging bag 30 or a microwave container 42 (storage container) made from a composite film 10B including a composite film 10A has a glossy or semi-glossy appearance due to the tin-deposited film 12 having a colorless silver or colored silver tin-deposited layer 21, and the aesthetic appearance of the packaging bag 30 or the lid material 44 can be improved by the cosmetic properties of the tin-deposited film 12. In the packaging bag 30 or the lid material 44 (lid film) of the microwave container 42 (storage container) made from the composite film 10B including the composite film 10A, the formation portion 23 where the tin vapor deposition layer 21 is formed is formed on the inner surface 20 (the surface where tin is vapor deposited) of the transparent vapor deposition film 19, and the inner surface 20 of the transparent vapor deposition film 19 is covered with the tin vapor deposition layer 21 at the formation portion 23. Therefore, the concealing property of the tin vapor deposition film 12 having the tin vapor deposition layer 21 makes it impossible to see the one surface 15 (inner surface) from the other surface 16 (outer surface) of the packaging bag 30 or the lid material 44, and therefore it is possible to make it impossible to see the contents (object to be heated) from the outside of the packaging bag 30 or the lid material 44.

In the lid material 44 (lid film) of the packaging bag 30 or microwave oven container 42 (storage container) made from the composite film 10B including the composite film 10A, the non-formed portion 24 where the tin vapor deposition layer 21 is not formed is formed on the inner surface 20 (the surface where the tin is vapor-deposited) of the transparent vapor deposition film 19, and the inner surface 20 of the transparent vapor deposition film 19 is exposed in the non-formed portion 24 while the transparent vapor deposition film 19 is directly opposed to the synthetic resin film 11 and the printed film 26. This makes it possible to prevent the reflection of microwaves by the tin vapor deposition film 12 in the non-formed portion 24, and allows the microwaves radiated from the microwave oven to pass through the non-formed portion 24 of the transparent vapor deposition film 19 where the tin vapor deposition layer 21 is not present. When the contents (objects to be heated) contained in the storage space 35, 48 of the packaging bag 30 or the microwave container 42 (storage container) are heated in a microwave oven, the microwaves emitted from the microwave oven can pass through the tin vapor deposition film 12 (synthetic resin film 11, transparent vapor deposition film 20, printed film 26, first and second adhesive layers 13, 27, UV cut agent layer 14), so the contents can be heated sufficiently and reliably in the microwave oven.

The packaging bag 30 or the lid material 44 (lid film) of the microwave container 42 (storage container) made from the composite film 10B including the composite film 10A has a transparent UV cut agent layer 14 that blocks ultraviolet rays applied to the tin vapor deposition film 12 and positioned between the tin vapor deposition film 12 and the first adhesive layer 13, or the UV cut agent layer 14 is applied to the synthetic resin film 11 and positioned between the synthetic resin film 11 and the first adhesive layer 13. The UV cut agent layer 14 gives the packaging bag 30 or the lid material 44 a barrier function against ultraviolet rays, so that the packaging bag 30 or the lid material 44 can block ultraviolet rays, and deterioration, changes in physical properties, and changes in taste of the contents stored in the storage spaces 35, 48 of the packaging bag 30 or the microwave container 42 can be prevented.

The lid material 44 (lid film) of the packaging bag 30 or the microwave container 42 (storage container) made from the composite film 10B including the composite film 10A uses a transparent deposition film 19 that has gas barrier properties and water vapor barrier properties, so the packaging bag 30 and the lid material 44 do not allow oxygen to pass through, and the contents stored in the storage spaces 35, 48 of the packaging bag 30 or the microwave container 42 can be prevented from oxidizing, drying, or growing mold. The packaging bag 30 and the lid material 44 do not allow water vapor to pass through, and the contents stored in the storage spaces 35, 48 of the packaging bag 30 or the microwave container 42 can be prevented from becoming damp.

The packaging bag 30 or the lid material 44 (lid film) of the microwave container 42 (storage container) made from the composite film 10B containing the composite film 10A has a predetermined graphic (printed layer) printed on the inner surface 29 of the printed film 26 (printed layer), so that the predetermined graphic can be seen from the outside of the packaging bag 30 or the lid material 44, and the image, product logo, product name, product description, product advertisement, product selling price, product manufacturer or distributor, product manufacturing date, product expiration date, product constituents, etc. of the product (contents) stored in the storage space 35, 48 of the packaging bag 30 or microwave container 42 can be confirmed.

Figure 10 is a diagram showing an example of reading various data from the IC tag 41 of the packaging bag 30 or the microwave container 42 by an IC tag reader 51. The data stored in the IC chip of the IC tag 41 (RFID tag) attached to the packaging bag 30 or the microwave container 42 (storage container) is read by the IC tag reader 51 (electronic data reading device) connected to a cash register (POS register). In the lid material 44 (lid film) of the packaging bag 30 or microwave container 42 (storage container) made from the composite film 10B including the composite film 10A, the tin-deposited film 12 having the non-formed area 24 where the tin-deposited layer 21 is not formed does not radiate radio waves randomly, and the radiation of radio waves is not impeded by the tin-deposited film 12. Therefore, radio waves are emitted from the IC tag 41 according to the radiation characteristics, and the tin-deposited film 12 having the non-formed area 24 does not block the radio waves, enabling communication between the IC tag 41 and the IC tag reader 51, and allowing the IC tag reader 51 to smoothly read various data stored in the IC tag 41.

When multiple packaging bags 30 and multiple microwave containers 42 (containers) are lined up in a store and the purchaser purchases the packaging bags 30 and the microwave containers 42, the purchaser brings the packaging bags 30 and the microwave containers 42 to the payment counter. At the payment counter, the IC tag reader 51 reads various data (identifier of the packaging bag 30 or the microwave container 42, the product name and sales price of the product (contents) contained in the storage space 35, 48 of the packaging bag 30 or the microwave container 42, 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.) written (stored) in the IC tag 41 attached to the packaging bag 30 or the microwave container 42. The various data read by the IC tag reader 51 is transmitted from the IC tag reader 51 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 42 based on the various data transmitted.

Even if an IC tag 41 is attached to the lid material 44 (lid film) of the packaging bag 30 or microwave container 42 (storage container) made from the composite film 10B including the composite film 10A, the tin-deposited film 12 having the non-forming portion 24 does not irradiate radio waves (radio wave interference), preventing the IC tag 41 from malfunctioning, and the IC tag reader 51 can smoothly read various data stored in the IC tag 41. In addition, the tin-deposited film 12 having the non-forming portion 24 does not block radio waves, enabling communication between the IC tag 41 and the IC tag reader 51. The IC tag 41 can be used to centrally manage inventory, stocktaking, sales, etc.

10A Composite film 10B Composite film 11 Synthetic resin film 12 Tin vapor deposition film 13 First adhesive layer 14 UV cut agent layer 15 One surface (inner surface)
16. The other side (outer side)
17 Outer surface 18 Inner surface 19 Transparent deposition film 20 Inner surface (surface)
21 Tin vapor deposition layer 22 Outer surface (surface)
23 Formed portion 24 Non-formed portion 26 Printed film (printed layer)
27 Second adhesive layer 28a, b Pay-off roll 29 Inner surface 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 Inner surface 40 Outer surface 41 IC tag (electronic data storage medium)
42 Microwave container (storage container)
43 Container body 44 Lid material (lid film)
45 Bottom wall 46 Peripheral wall 47 Upper opening 48 Storage space 49 Flange 50 Peripheral edge 51 IC tag reader (electronic data reading device)
L1 to L6 thickness dimensions

Claims (7)

a synthetic resin film made of a thermoplastic synthetic resin; a tin-deposited film on which tin is deposited and bonded to an outer surface of the synthetic resin film; a first adhesive layer located between the synthetic resin film and the tin-deposited film to bond the synthetic resin film and the tin-deposited film; and a UV-cutting agent layer applied to the tin-deposited film and positioned between the tin-deposited film and the first adhesive layer, or applied to the synthetic resin film and positioned between the synthetic resin film and the first adhesive layer, to provide a barrier against ultraviolet rays ;
the tin-deposited film is formed from a transparent deposited film having gas barrier properties and water vapor barrier properties, and a tin-deposited layer deposited on an inner or outer surface of the transparent deposited 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 inner or outer surface of the transparent vapor-deposited film on which tin is deposited, the ratio of the formed portion of the tin-deposited layer to a unit area (1 cm x 1 cm: 1 cm ² ) of the transparent vapor-deposited film is in the range of 75 to 85%, the ratio of the non-formed portion of the tin-deposited layer to a unit area (1 cm x 1 cm: 1 cm ² ) of the transparent vapor-deposited film is in the range of 15 to 25%, and the thickness dimension of the tin-deposited film is in the range of 10 to 14 μm,
A composite film characterized in that, in the formation portion, the inner or outer surface of the transparent vapor deposition film is covered with the tin vapor deposition layer, and, in the non-formation portion, the inner or outer surface of the transparent vapor deposition film is exposed while the transparent vapor deposition film faces the synthetic resin film . The composite film according to claim 1, comprising a printed layer having a printed surface with a predetermined image printed thereon and bonded to the outer surface of the tin-deposited film, and a second adhesive layer positioned between the tin-deposited film and the printed layer to bond the tin-deposited film and the printed layer. The composite film is capable of transmitting microwaves through the tin-vapor-deposited film, and is capable of heating contents contained in the storage space of a packaging bag made of the composite film and having 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, the first synthetic resin film forming the inner surface and the printed layer forming the outer surface, by irradiating the microwaves; or is capable of heating contents contained in a container body made of a polyolefin-based thermoplastic resin and a lid made of the composite film and closing an upper opening of the container body, the first synthetic resin film forming the inner surface of the lid material and the printed layer forming the outer surface of the lid material, by irradiating the microwaves. The composite film according to claim 2 or 3, wherein radio waves can pass through the tin-deposited film, and electronic data written in an electronic data storage medium arranged on the inner surface side of the tin-deposited film can be read by an electronic data reader located on the outer surface side of the composite film. The composite film according to any one of claims 2 to 4, wherein the tin vapor deposition layer is colorless silver or colored silver, and the tin vapor deposition film has a glossy or semi-glossy appearance, which enhances the aesthetic appearance, and a concealing property that makes it impossible to see one side of the composite film from the other side. The composite film according to claim 5, wherein the thickness dimension of the synthetic resin film is in the range of 45 to 55 μm, and the thickness dimension of the printed layer is in the range of 18 to 22 μm. The composite film according to claim 6, wherein the thickness dimension of the first and second adhesive layers and the UV cut agent layer is in the range of 2 to 4 μm.

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