JP7172274B2 - Laminated films and packaging containers - Google Patents

Description

TECHNICAL FIELD The present invention relates to a laminated film, and more particularly to a laminated film that can suitably heat contents in a microwave oven when used in a packaging container, and a packaging container using this laminated film.

Conventionally, cooked or semi-cooked food is stored in a packaging container such as a packaging bag or a cup container so that it can be stored at room temperature, low temperature, or frozen, and heated in a microwave oven without being opened to make it edible. technology is known.

If the packaging container is heated in a microwave oven without being opened, the moisture inside the packaging container turns into steam and the volume increases. Therefore, if there is no gap through which water vapor can escape, the packaging container may explode. On the other hand, if the contents are in a semi-cooked state or the like, it may be necessary not only to heat the contents but also to steam them with the generated steam. In this case, if the holes or the like through which the steam escapes are excessively large, steaming is not sufficiently performed, and there is a problem that the flavor is deteriorated.

For example, Patent Document 1 discloses a packaging bag that can be steamed when heated by a microwave oven, and that is suitable for the above applications. In this packaging bag, a portion of a laminated film having an outer layer and an inner layer is formed with a brittle processed portion that is formed by irradiating the outer layer with a laser and has a depth that reaches at least the inside of the outer layer and does not penetrate the inner layer. A configuration is disclosed. When this packaging bag is heated in a microwave oven, the inner layer tears and small holes are formed. Therefore, excessive steam does not escape, and steaming can be performed while preventing bursting.
Moreover, the packaging bag described in Patent Document 1 does not have an ink layer formed by printing ink on and around the fragile processed portion. That is, the fragile processed portion and its surroundings in the packaging bag described in Patent Document 1 are formed substantially transparent.

Japanese Patent No. 6167702

A laminate film for forming a packaging bag described in Patent Document 1 may be inspected using an inspection apparatus shown in FIG. Specifically, for example, while the laminated film 10 is wound around the roller 200 and rotated, the laminated film 10 is irradiated with visible light emitted from the inspection camera 300, and the reflected light is used to measure the color difference between the fragile processed portion and its surroundings. There is a method of inspecting whether or not a fragile processed portion is reliably formed by detecting .

However, in the laminated film forming the packaging bag described in Patent Document 1, the fragile processed portion and its surroundings are formed substantially transparent. Therefore, when the fragile processed portion of the laminated film and its surroundings are irradiated with visible light, sufficient reflected light for inspection cannot be secured. As a result, it may not be possible to accurately detect the fragile processed portion.

From another point of view, the packaging container should be formed with consideration given to ensuring the light-shielding properties of the packaging container, keeping the contents contained in the packaging container fresh, and not limiting the design of the packaging container. It is also required to provide an ink layer on and around the fragile processed portion of the laminated film.

In view of the above circumstances, the present invention aims to provide a laminated film that facilitates inspection of formed fragile processed parts and that can prevent bursting when heated in a microwave oven by applying it to a packaging container. aim.
Another object of the present invention is to provide a packaging container that is formed using this laminated film and that can prevent bursting when heated in a microwave oven.

According to the first aspect of the present invention, the laminated film includes a heat-sealable inner layer, an outer layer laminated on the inner layer, an intermediate layer provided between the inner layer and the outer layer, and the outer layer and the intermediate layer, an ink layer formed of ink, and a fragile processed portion formed within the range of the ink layer and having a depth reaching an intermediate portion in the thickness direction of the intermediate layer A lamination strength between the intermediate layer and the inner layer is greater than 1.5 N/15 mm, and the intermediate layer is made of a material having relatively high rigidity as a base layer.
Alternatively, according to the first aspect of the present invention, the laminated film includes a heat-sealable inner layer, an outer layer laminated on the inner layer, an intermediate layer provided between the inner layer and the outer layer, an ink layer formed of ink between the outer layer and the intermediate layer; and a fragile processed portion formed within the range of the ink layer and having a depth reaching an intermediate portion in the thickness direction of the intermediate layer. , wherein the lamination strength between the intermediate layer and the inner layer is greater than 1.5 N/15 mm, and the intermediate layer is made of a resin material that can be at least partially removed by laser irradiation as a base layer. there is

In the laminated film, the fragile processed portion may have a depth penetrating the intermediate layer in the thickness direction of the intermediate layer.
In the laminated film, the ink layer may be formed of the ink capable of reflecting light having a wavelength of at least 380 nm to 700 nm to develop color .
In the laminated film, the intermediate layer may be made of any resin material selected from the group consisting of polyethylene terephthalate (PET), biaxially oriented polypropylene (OPP), and biaxially oriented nylon (ONy).

According to a second aspect of the present invention, a packaging container includes at least a portion of the laminated film according to each aspect described above, and an opening is formed in the fragile processed portion when heated by a microwave oven.

According to the laminated film of the present invention, it is easy to inspect the formed fragile processed part, and by applying it to a packaging container, it is possible to prevent rupture during heating with a microwave oven. Moreover, according to the packaging container of the present invention, it is possible to prevent the rupture during heating with a microwave oven.

(a) and (b) are a perspective view and a cross-sectional view schematically showing a cup container formed using a laminated film according to an embodiment of the present invention. (a) and (b) are cross-sectional views taken along the line AA in FIG. 1, and are cross-sectional views schematically showing the configuration of the laminated film according to the present embodiment. (a) and (b) are diagrams showing openings formed in a fragile processed portion when heated in a microwave oven. 1 is a perspective view schematically showing a packaging bag formed using a laminated film according to this embodiment; FIG. FIG. 4 is a cross-sectional view schematically showing the configuration of a laminated film of a comparative example; It is a figure showing an inspection device for inspecting a lamination film concerning this embodiment.

(Structure of laminated film 10)
A laminated film according to one embodiment of the present invention will be described below with reference to FIGS. 1 to 4. FIG.
(a) and (b) of FIG. 1 are a perspective view and a cross-sectional view showing a cup container (packaging container) 1 formed using a laminated film 10 according to this embodiment. As shown in FIGS. 1(a) and 1(b), the laminated film 10 is attached as a lid member 110 to the main body 100 of the cup container 1 made of plastic or the like.
In this embodiment, the procedure and method for forming the lid member 110 using the laminated film 10 are not particularly limited. For example, the lid member 110 and the main body 100 may be integrated by joining the laminated film 10 and the edge of the main body 100 by heat sealing.

2(a) and 2(b) are cross-sectional views of the laminated film 10 along line AA of FIG. 1(a). The laminated film 10 includes an outer layer 20 that forms the outer surface of the lid member 110, an inner layer 40 that forms the inner surface of the lid member 110 and is heat-sealable, and an intermediate layer 30 that is formed between the outer layer 20 and the inner layer 40. and an ink layer 50 formed between the outer layer 20 and the intermediate layer 30 . As will be described later, in (a) of FIG. 2, the fragile processed portion 60 formed by irradiating the outer layer 20 with a laser beam penetrates the outer layer 20 and the ink layer 50 and extends in the thickness direction. It has a depth reaching the intermediate portion of the intermediate layer 30 . On the other hand, in FIG. 2B, the fragile processed portion 60 formed by irradiating the outer layer 20 with laser light penetrates both the outer layer 20 and the ink layer 50 and the intermediate layer 30. have depth.
In this embodiment, the outer layer 20, the intermediate layer 30, and the inner layer 40 are all made of a resin material.

The outer layer 20 is a layer in direct contact with the external environment, and is a base layer made of a resin material. From the viewpoint of protecting the contents housed in the cup container 1, the outer layer 20 is preferably made of a material with relatively high rigidity. The outer layer 20 may be formed of, for example, polyethylene terephthalate (hereinafter referred to as PET), biaxially oriented polypropylene (hereinafter referred to as OPP), biaxially oriented nylon (hereinafter referred to as ONy), or the like. , but not limited to

The inner layer 40 functions as a so-called sealant layer. As the resin material forming the inner layer 40, for example, low-density polyethylene (LDPE) or linear low-density polyethylene (LLDPE), which is a heat-sealable thermoplastic resin material, can be used, but is not limited to these. . In this embodiment, the inner layer 40 of the laminated film 10 may be formed using, for example, unstretched polypropylene (CPP) or an easy peel film that can be easily peeled off from the adherend after being sealed. Specifically, a resin film made of a polymer alloy having a sea-island structure formed by mixing a heat-adhesive resin (for example, a polyolefin resin) and a resin that is incompatible or hardly compatible with this resin, or such a resin film. A multi-layer film containing a resin layer containing such a resin layer is commercially available as an easy-peel film, and can be used as appropriate.

An ink layer 50 is formed between the outer layer 20 and the inner layer 40 . The ink layer 50 is a structure for enhancing the design of the packaging container and providing various indications regarding the contents, and can be formed using various known inks. In this embodiment, the ink layer 50 may be formed using various known inks and have a light-shielding property in order to maintain the quality of the contents housed in the packaging container. In addition, in the present embodiment, in order to confirm whether or not the fragile processed portion 60 described later is surely formed, for example, the ink layer 50 should reflect and color light having a wavelength of at least 380 nm to 700 nm. may be formed using an ink capable of

In this embodiment, for example, the ink layer 50 may be formed on the inner inner surface of the outer layer 20 facing the inner layer 40 by printing, spraying, coating, or the like. That is, in this embodiment, the outer layer 20 and the ink layer 50 may be integrally formed. However, the configuration of the ink layer 50 is not limited to this. For example, the ink layer 50 may be formed on the outer surface of the intermediate layer 30 (to be described later) facing the outer layer 20 .
In this embodiment, the range in which the ink layer 50 is provided is not particularly limited. For example, as shown in (a) of FIG. 1 , in a plan view of the lid member 110 , a fragile processed portion 60 to be described later may be formed within the range where the ink layer 50 is formed. In this embodiment, the ink layer 50 may be formed over the entire inner surface of the outer layer 20 .

In general, when the ink layer 50 is interposed between the outer layer 20 and the inner layer 40, the laminate strength between the outer layer 20 and the inner layer 40 is lowered. On the other hand, in order to form an opening in the fragile processed portion, the lamination strength between the inner layer 40 and the layer laminated on the inner layer 40 must be high. In this embodiment, by providing the intermediate layer 30 between the outer layer 20 and the inner layer 40, it is possible to prevent the lamination strength between the layers of the laminated film 10 from decreasing as a whole. In this embodiment, the ink layer 50 is provided between the outer layer 20 and the intermediate layer 30 .

The intermediate layer 30 is a layer made of a resin material between the outer layer 20 and the inner layer 40 . In this embodiment, the intermediate layer 30 may be made of a resin material such as polyethylene terephthalate (PET), biaxially oriented polypropylene (OPP), or biaxially oriented nylon (ONy). That is, in the present embodiment, the outer layer 20 and the intermediate layer 30 are formed as so-called base layers.

In this embodiment, the laminated film 10 can be formed by a dry lamination method in which the outer layer 20, the intermediate layer 30, and the inner layer 40 are joined in the thickness direction thereof using an adhesive. is not limited to For example, between the outer layer 20 and the intermediate layer 30, a sandwich film layer (S-PE layer) made of polyethylene resin (eg, LLDPE) can be provided. Specifically, the laminated film 10 according to the present embodiment is produced by a sandwich lamination method in which the polyethylene resin constituting the sandwich film layer is melted, and the melted polyethylene resin is sandwiched between the outer layer 20 and the intermediate layer 30 for lamination. may be formed.
Moreover, in the present embodiment, the laminate strength between the intermediate layer 30 and the inner layer 40 in the laminated film 10 is greater than 1.5 N 2 /15 mm .

(Configuration of fragile processed portion 60)
As shown in (a) and (b) of FIG. 1 and (a) and (b) of FIG. A fragile processed portion 60 is provided. In this embodiment, the laminated film 10 has a groove 60a formed by removing a region having a width W1 of about 150 micrometers (μm) and a length L1 of about 30 millimeters (mm). In the present embodiment, the weakened processed portion 60 is a portion of the laminated film 10 that is located within the groove 60a and is thinner than other portions.

In this embodiment, the groove 60a is formed to have a depth that penetrates the outer layer 20 and reaches at least the intermediate portion of the intermediate layer 30 in the thickness direction of the laminated film 10 . In addition, in the present embodiment, the fragile processed portion 60 may be formed to have a depth that penetrates both the outer layer 20 and the intermediate layer 30 in the thickness direction. In the laminated film 10, the outer layer 20, the ink layer 50, and at least part of the intermediate layer 30 are removed in the thickness direction of the region where the fragile processed portion 60 is provided, and grooves 60a having different depths are formed. A plurality of them may be formed.

The fragile processed portion 60 may be formed anywhere as long as it avoids the edge of the lid member 110, that is, the portion where the lid member 110 and the body portion 100 are heat-sealed to connect the lid member 110 and the main body portion 100. It can be formed at an arbitrary position in consideration of the filling process and the like. In the present embodiment, the fragile processed portion 60 is provided within a range where the ink layer 50 is formed in the plan view of the lid member 110 .

As means for forming the fragile processed portion 60, for example, laser processing using laser irradiation is suitable. When laser processing is used, the shape and processing depth of the fragile processed portion can be adjusted relatively easily by adjusting the output and scanning speed of the laser head. However, the forming means is not limited to laser processing, and other methods can also be used.

When laser processing is used to form grooves 60a having a depth that penetrates intermediate layer 30, intermediate layer 30 is substantially removed. On the other hand, since the inner layer 40 of the laminated film 10 according to the present embodiment is made of a thermoplastic resin material that does not absorb laser light, the inner layer 40 is almost never removed by laser processing. At this time, the heat generated during laser processing may melt a small portion of the outer surface of the inner layer 40 that contacts the intermediate layer 30, but the inner layer 40 is not penetrated. For this reason, the lid member 110 formed using the laminated film 10 according to the present embodiment has the above-described configuration, so that leakage and deterioration of the contents accommodated in the cup container 1 can be suitably prevented. can.

(Confirmation of fragile processed portion 60)
In this embodiment, in order to confirm whether or not the fragile processed portion 60 is surely formed in the laminated film 10, the so-called reflective inspection device shown in FIG. 6 can be used to detect the fragile processed portion 60. Are known. Specifically, the laminated film 10 is wound so as to be in close contact with a part of the surface of the roller 200, and the roller 200 is rotated with the outer layer 20 facing radially outward of the roller 200, and the detection from the inspection camera 300 is performed. Laminated film 10 wrapped around a rotating roller can be illuminated with light (eg, visible light in the wavelength range of at least 380 to 700 nanometers). Then, the weak processed portion 60 of the laminated film 10 can be detected by detecting the reflected light of the detection light from the laminated film 10 by the sensor of the inspection device.

In this embodiment, an ink layer 50 is provided between the outer layer 20 and the intermediate layer 30 . As described above, the ink layer 50 is formed using various known inks and has light shielding properties. In the present embodiment, the color of various inks forming the ink layer 50 may be appropriately set according to the design of the packaging container, various indications regarding the contents, and the like, and is not particularly limited. The ink that forms the ink layer 50 may be formed of ink having any one color or a color that is a mixture of a plurality of colors selected from colors such as white, black (ink), blue, red, and yellow, for example. good. The ink layer 50 may be a pattern layer in which inks of a plurality of colors are superimposed like gravure printing.
The ink layer 50 is not transparent, and is formed of inks having various colors as described above, so that the light transmittance is 60% for the incident light with a wavelength of 380 to 700 nm from the inspection camera 300. It is below.

Therefore, the detection light from the inspection camera 300 can be prevented from passing through the laminated film 10 and reaching the roller 200 and being reflected by the roller 200 . As a result, when the fragile processed portion 60 formed on the laminated film 10 is detected using this reflection type inspection device, unevenness on the surface of the roller 200, dust and oily dirt adhered to the surface of the roller 200, etc. are mistakenly detected. can be prevented from being detected.
In this embodiment, the lamination film 10 having the fragile processed portion 60 formed by laser processing is detected by a reflective inspection device, and only the fragile processed portion 60 formed by laser processing is detected. It was confirmed that dust and oily stains attached to the surface of 200 were not detected.

As another method for confirming whether or not the fragile processed portion 60 of the laminated film 10 has been reliably formed, a method of measuring the tensile strength at break of the laminated film 10 can be considered. In the laminated film 10, for example, the groove 60a penetrates only the outer layer 20 and has a depth not reaching the intermediate layer 30, the groove 60a has a depth reaching the intermediate layer 30, and the groove 60a The tensile strength at break of the laminated film 10 is clearly different from the case where has a depth penetrating the intermediate layer 30 . Therefore, by confirming the correspondence relationship between the depth of the groove 60a and the tensile breaking strength of the laminated film 10 in advance, and measuring the tensile breaking strength of the laminated film 10 in which the weakened processed portion 60 is formed, the weakened processed portion 60 It is possible to confirm whether or not it is formed reliably and the aspect of the fragile processed portion 60 (the depth of the groove 60a).

(Structure of cup container 1 having laminated film 10)
In this embodiment, the laminated film 10 having the fragile processed portion 60 formed at an arbitrary position is used to cover the opening of the body portion 100 of the cup container 1 filled with the contents, and the laminated film 10 and the body portion are heat-sealed. By joining the edges of 100, the sealed cup container 1 filled with contents is completed.
When the cup container 1 filled with the contents is placed in a microwave oven and heated, the water contained in the contents expands as steam, and the internal pressure of the cup container 1 rises. A rise in the internal pressure of the cup container 1 causes a tear in the fragile processed portion 60 to form an opening 61 penetrating through the laminated film 10 in the thickness direction. 3(a) and 3(b) are diagrams for observing the surface of the laminated film 10 from the outside of the laminated film 10, that is, from the outer layer 20 side. In this embodiment, when the internal pressure of the cup container 1 rises during heating with a microwave oven, the fragile processed portion 60 may be formed with a plurality of openings 61 spaced apart from each other, as shown in FIG. However, as shown in FIG. 3(b), continuous openings 61 may be formed along the longitudinal direction. In this embodiment, as shown in FIG. 3A, the plurality of openings 61 spaced apart from each other may have different sizes.
In this embodiment, the plurality of openings 61 shown in FIG. 3A and the continuous openings 61 shown in FIG. . In other words, the plurality of openings 61 shown in (a) of FIG. 3 and the continuous openings 61 shown in (b) of FIG. Moreover, it does not extend to a portion other than the range in which the fragile processed portion 60 is formed.

The LLDPE forming the inner layer 40 of the laminated film 10 according to the present embodiment is highly flexible and stretchable, and has high impact strength. 61 can be prevented from extending to a portion other than the range of the fragile processed portion 60. - 特許庁

Since the opening 61 is formed in the fragile processed part 60, the water vapor generated inside the cup container 1 does not escape to the outside of the cup container 1 all at once, but continues to escape as needed to prevent bursting as the internal pressure rises. As a result, the cup container 1 does not explode or the like even when heated by a microwave oven, and steaming by the water vapor remaining in the cup container 1 is preferably carried out.

As described above, an example in which the inner layer 40 of the laminated film 10 is made of LLDPE has been described, but the structure of the laminated film 10 of the present invention is not limited to this. For example, the inner layer 40 of the laminated film 10 may be formed using an easy-peel film in order to improve the ease of opening the lid of the container. For the inner layer 40 of the laminated film 10, an easy peel film having a different structure can be appropriately selected according to the application, and smooth peelability, excellent protection, and excellent lamination suitability can be realized.

(Structure of packaging bag 1A having laminated film 10)
As described above, the laminated film 10 according to this embodiment can form the lid member 110 of the cup container 1 . The laminated film 10 according to this embodiment can form, for example, a packaging bag (packaging container) 1A, as shown in FIG.
The packaging bag 1A is formed in a bag shape using the laminated film 10 of the present invention, at least one surface of which is heat-sealable.

The packaging bag 1A is formed by heat-sealing the end portions 10a and 10b of a sheet of laminated film 10 to form a substantially cylindrical shape, and then connecting both end portions 10c and 10d in the direction in which the lumen of the cylindrical shape extends. It is formed into a bag-like shape by being joined by heat sealing.
In the packaging bag 1A, there are no particular restrictions on the procedure or method for forming the laminated film 10 into a bag shape. For example, the packaging bag 1A may be formed by arranging two sheets of the laminated film 10 facing each other and joining the respective peripheral portions by heat sealing, or other methods may be employed.

In the packaging bag 1A, the laminated film 10 may have substantially the same configuration as the laminated film 10 of the cup container 1 described above, except for the inner layer 40 described later.
In the packaging bag 1A, the inner layer 40 of the laminated film 10 functions as a sealant layer. As the resin material forming the inner layer 40, for example, low-density polyethylene (LDPE) or linear low-density polyethylene (LLDPE), which is a heat-sealable thermoplastic resin material, can be used, but is not limited to these. . In this embodiment, the inner layer 40 of the laminated film 10 may be formed using, for example, unstretched polypropylene (CPP).
This is because the packaging bag 1A often does not need to consider the openability of the lid member 110 of the cup container 1 described above, and the inner layer 40 does not necessarily need to be formed using an easy peel film.

As shown in FIG. 4, a portion of the outer surface of the packaging bag 1A is provided with a fragile processed portion 60 from which at least a portion is removed. The fragile processed portion 60 provided on the outer surface of the packaging bag 1A may have the same configuration as the fragile processed portion 60 provided on the lid member 110 of the cup container 1 described above.
Regarding the position where the fragile processed part 60 is formed, it is possible to avoid the parts, such as the ends 10a to 10d, which are heat-sealed to form the laminated film 10 in a bag shape, and be within the range where the ink layer 50 is formed. It can be formed anywhere, considering the type of contents, the filling process, etc., and can be formed at any position.
In the packaging bag 1A, a fragile processed portion 60, which will be described later, may be formed within the range where the ink layer 50 is formed. In the packaging bag 1</b>A, the ink layer 50 may be formed over the entire inner surface of the outer layer 20 of the laminated film 10 .

Since the packaging bag 1A is formed using the laminated film 10 in which the fragile processed portion 60 is formed, an opening 61 is formed in the fragile processed portion 60 in the same manner as the lid material 110 of the cup container 1 described above when heated by the microwave oven. be done. As a result, it is possible to suitably prevent the packaging bag 1A from bursting due to an increase in internal pressure.

(Action of laminated film 10)
As described above, in the present embodiment, the laminated film 10 includes the intermediate layer 30 between the outer layer 20 having the ink layer 50 and the inner layer 40, so that the ink layers 50 are laminated between the layers of the laminated film 10. A decrease in strength can be prevented. Furthermore, the lamination strength between the intermediate layer 30 and the inner layer 40 is greater than 1.5N/15mm. Therefore, when forming the lid member 110 of the cup container 1 or the packaging bag 1A using the laminated film 10 having the fragile processed portion 60, the required opening is formed in the fragile processed portion 60 during heating with a microwave oven. can do. As a result, it is possible to prevent the packaging container (for example, the cup container 1 or the packaging bag 1A) from bursting in response to an increase in internal pressure.

The laminated film 10 according to this embodiment is configured to have an ink layer 50 . Therefore, when the fragile processed portion 60 is formed in the laminated film 10 by laser processing, the ink layer 50 reflects the detection light from the inspection camera 300, thereby detecting the color difference between the fragile processed portion 60 and its surroundings. be able to. As a result, it is possible to detect whether or not the fragile processed portion 60 is reliably formed in the laminated film 10 using a reflective inspection device.
In addition, since the ink layer 50 can be formed on the entire surface of the laminated film 10, it is possible to meet demands for improving the design of the packaging container and freely providing various indications regarding the contents.

In the laminated film 10 according to the present embodiment, both the outer layer 20 and the intermediate layer 30 are made of materials with relatively high rigidity as base layers. Therefore, when forming the lid member 110 of the cup container 1 or the packaging bag 1A using the laminated film 10, heat resistance, cold resistance, and impact resistance can be imparted.
In particular, when the laminated film 10 is used to form the packaging bag 1A having the shape of a self-supporting bag, the stiffness of the packaging bag 1A can be improved. That is, when the laminated film 10 is used to form the packaging bag 1A having the shape of a self-supporting bag, the finished packaging bag 1A has excellent standability and can firmly stand on its own.

Furthermore, when forming the lid material 110 of the cup container 1 using the laminated film 10, the strength of the lid material 110 can be improved. As a result, for example, even when the cup containers 1 are stacked in two or more stages, it is possible to prevent the lid member 110 from unexpectedly breaking.

In the laminated film 10, when the fragile processed portion 60 is provided, there is no need to cut the inner layer 40 with a slit and then fuse it again. Therefore, the laminated film 10 can be used to easily manufacture the lid member 110 of the cup container 1 and the packaging bag 1A.
Furthermore, when forming the packaging bag 1A using the laminated film 10, the fragile processed part 60 is not limited to the part formed in the laminated film 10 except for the end where the inner layers 40 are heat-sealed. The degree of freedom in bag 1A design is high. Therefore, even when a plurality of types of packaging bags 1A having different formation positions of the fragile processed portions 60 are manufactured according to the type of contents, etc., it is possible to easily cope with such problems by changing the irradiation position of the laser beam, for example.

Hereinafter, the laminated film 10 according to the above embodiment of the present invention and the cup container 1 and the packaging bag 1A formed using the laminated film 10 will be further described using Examples 1 to 8. For comparison, the configurations of laminated films 10A of Comparative Examples 1 and 3 will also be described.

(Example 1)
The laminated film 10 according to Example 1 is formed using a 12 μm PET film as the outer layer 20, a 12 μm PET film as the intermediate layer 30, and a 40 μm LLDPE film as the inner layer 40, respectively. In addition, an ink layer 50 having a thickness of about 2 μm is provided between the outer layer 20 and the intermediate layer 30 . In Example 1, the outer layer 20 and the ink layer 50 are integrated.

The laminated film 10 according to Example 1 is configured by laminating an outer layer 20, an ink layer 50, an intermediate layer 30, and an inner layer 40 in this order. Specifically, the laminated film 10 is bonded between the outer layer 20 and the ink layer 50 and the intermediate layer 30 and between the intermediate layer 30 and the inner layer 40 by a dry lamination method using a known dry laminating adhesive. Then, it was manufactured by forming the fragile processed portion 60 by laser processing. Further, in the laminated film 10 according to Example 1, the groove 60 a of the weakened processed portion 60 has a depth that penetrates the intermediate layer 30 .

As films forming each layer of the laminated film 10, the following products were used. Specifically, as the PET film, Toyobo Ester (registered trademark) film E5100 (trade name; manufactured by Toyobo Co., Ltd.) was used. Bonyl-RX (trade name; manufactured by KOHJIN Film & Chemicals Co., Ltd.) was used as the Ny film. LL-XMTN (trade name; manufactured by Futamura Chemical Co., Ltd.) was used as the LLDPE film. As the easy peel film, Assist (registered trademark) EX02 (trade name; manufactured by Sumika Plastech Co., Ltd.) was used. As the LDPE film, V-1 (trade name; manufactured by Tamapoly Co., Ltd.) was used. FHK2 (trade name; manufactured by Futamura Chemical Co., Ltd.) was used as the CPP film. In the description of each example below, the films forming each layer of the laminated film 10 are the same, unless otherwise specified.

As the dry lamination adhesive, for example, a polyurethane adhesive can be used. Specifically, polyurethane adhesives for laminating laminated films such as Takelac (registered trademark) A (trade name; manufactured by Mitsui Chemicals, Inc.) and Takenate (registered trademark) A (trade name; manufactured by Mitsui Chemicals, Inc.) used the drug. In the description of each example below, the same dry laminating adhesive is used for bonding each layer of the laminated film 10 unless otherwise specified.

Hereinafter, the configuration of the laminated film 10 according to Example 1 is expressed as "PET12/PET12/LLDPE40". The indication "PET12/PET12/LLDPE40" means that the 12 μm PET film of the outer layer 20, the 12 μm PET film of the intermediate layer 30, and the 40 μm LLDPE film of the inner layer 40 are joined with an adhesive by the dry lamination method. The structure of the laminated film 10 obtained by the above is shown.

(Example 2)
The laminated film 10 according to Example 2 is formed using a 16 μm PET film as the outer layer 20 , a 15 μm nylon film as the intermediate layer 30 , and a 40 μm LDPE film as the inner layer 40 . In addition, an ink layer 50 having a thickness of about 2 μm is provided between the outer layer 20 and the intermediate layer 30 . In Example 2, the outer layer 20 and the ink layer 50 are integrated.
Furthermore, in the laminated film 10 according to Example 2, the fragile processed portion 60 is formed by laser processing. In the laminated film 10 according to Example 2, the groove 60 a of the weakened processed portion 60 has a depth that penetrates the intermediate layer 30 .

Hereinafter, the configuration of the laminated film 10 according to Example 2 is expressed as "PET16/NY15/LDPE40". Specifically, the indication “PET16/NY15/LDPE40” means that a 16 μm PET film as the outer layer 20, a 15 μm nylon film as the intermediate layer 30, and a 40 μm LDPE film as the inner layer 40 are laminated by a dry lamination method. shows the structure of the laminated film 10 obtained by joining with.

(Example 3)
The laminated film 10 according to Example 3 is formed using a 12 μm PET film as the outer layer 20 , a 12 μm PET film as the intermediate layer 30 , and a 30 μm LDPE film as the inner layer 40 . In addition, an ink layer 50 having a thickness of about 2 μm is provided between the outer layer 20 and the intermediate layer 30 . In Example 3, the outer layer 20 and the ink layer 50 are integrated.
In the laminated film 10 according to Example 3, a fragile processed portion 60 is formed by laser processing. In the laminated film 10 according to Example 3, the groove 60 a of the weakened processed portion 60 has a depth that penetrates the intermediate layer 30 .

Hereinafter, the configuration of the laminated film 10 according to Example 3 is expressed as "PET12/PET12/LDPE30". Specifically, the indication “PET12/PET12/LDPE30” means that a 12 μm PET film of the outer layer 20, a 12 μm PET film of the intermediate layer 30, and a 30 μm LDPE film of the inner layer 40 are bonded together by a dry lamination method. shows the structure of the laminated film 10 obtained by joining with.

(Example 4)
The laminated film 10 according to Example 4 is formed using a 16 μm PET film as the outer layer 20 , a 16 μm PET film as the intermediate layer 30 , and a 30 μm LLDPE film as the inner layer 40 . In addition, an ink layer 50 having a thickness of about 2 μm is provided between the outer layer 20 and the intermediate layer 30 . In Example 4, the outer layer 20 and the ink layer 50 are integrated.
In the laminated film 10 according to Example 4, a fragile processed portion 60 is formed by laser processing. In the laminated film 10 according to Example 4, the groove 60 a of the weakened processed portion 60 has a depth reaching the intermediate portion of the intermediate layer 30 in the thickness direction of the laminated film 10 .

Hereinafter, the configuration of the laminated film 10 according to Example 4 is expressed as "PET16/PET16/LLDPE30". Specifically, the indication “PET16/PET16/LLDPE30” means that a 16 μm PET film of the outer layer 20, a 16 μm PET film of the intermediate layer 30, and a 30 μm LLDPE film of the inner layer 40 are bonded together by a dry lamination method. shows the structure of the laminated film 10 obtained by joining with.

(Example 5)
The laminated film 10 according to Example 5 is formed using a 15 μm nylon film as the outer layer 20, a 15 μm nylon film as the intermediate layer 30, and a 40 μm LDPE film as the inner layer 40, respectively. In addition, an ink layer 50 having a thickness of about 2 μm is provided between the outer layer 20 and the intermediate layer 30 . In Example 5, the outer layer 20 and the ink layer 50 are integrated.
In the laminated film 10 according to Example 5, a fragile processed portion 60 is formed by laser processing. In the laminated film 10 according to Example 5, the groove 60 a of the weakened processed portion 60 has a depth reaching the intermediate portion of the intermediate layer 30 in the thickness direction of the laminated film 10 .

Hereinafter, the configuration of the laminated film 10 according to Example 5 is expressed as "NY15/NY15/LDPE40". Specifically, the indication "NY15/NY15/LDPE40" means that a 15 μm nylon film of the outer layer 20, a 15 μm nylon film of the intermediate layer 30, and a 40 μm LDPE film of the inner layer 40 are laminated by a dry lamination method. shows the structure of the laminated film 10 obtained by joining with.

(Example 6)
The laminated film 10 according to Example 6 is formed using a 12 μm PET film as the outer layer 20 , a 12 μm PET film as the intermediate layer 30 , and a 40 μm CPP film as the inner layer 40 . In addition, an ink layer 50 having a thickness of about 2 μm is provided between the outer layer 20 and the intermediate layer 30 . In Example 6, the outer layer 20 and the ink layer 50 are integrated.
In the laminated film 10 according to Example 6, a fragile processed portion 60 is formed by laser processing. In the laminated film 10 according to Example 6, the groove 60 a of the weakened processed portion 60 has a depth reaching the intermediate portion of the intermediate layer 30 in the thickness direction of the laminated film 10 .

Hereinafter, the configuration of the laminated film 10 according to Example 6 is expressed as "PET12/PET12/CPP40". Specifically, the indication “PET12/PET12/CPP40” means that a 12 μm PET film as the outer layer 20, a 12 μm PET film as the intermediate layer 30, and a 40 μm CPP film as the inner layer 40 are bonded together by a dry lamination method. shows the structure of the laminated film 10 obtained by joining with.

(Example 7)
The laminated film 10 according to Example 7 is formed using a 12 μm PET film as the outer layer 20 , a 12 μm PET film as the intermediate layer 30 , and a 30 μm easy peel film as the inner layer 40 . In addition, an ink layer 50 having a thickness of about 2 μm is provided between the outer layer 20 and the intermediate layer 30 . In Example 7, the outer layer 20 and the ink layer 50 are integrated.
In the laminated film 10 according to Example 7, a fragile processed portion 60 is formed by laser processing. In the laminated film 10 according to Example 7, the groove 60 a of the weakened processed portion 60 has a depth reaching the intermediate portion of the intermediate layer 30 in the thickness direction of the laminated film 10 .

Hereinafter, the configuration of the laminated film 10 according to Example 7 is expressed as "PET12/PET12/easy peel 30". Specifically, the indication "PET12/PET12/easy peel 30" means that a 12 μm PET film as the outer layer 20, a 12 μm PET film as the intermediate layer 30, and a 30 μm easy peel film as the inner layer 40 are formed by a dry lamination method. shows the structure of a laminated film 10 obtained by bonding with an adhesive.

(Example 8)
The laminated film 10 according to Example 8 is formed using a 12 μm PET film as the outer layer 20, a 12 μm PET film as the intermediate layer 30, and a 50 μm easy peel film as the inner layer 40, respectively. In addition, an ink layer 50 having a thickness of about 2 μm is provided between the outer layer 20 and the intermediate layer 30 . In Example 8, the outer layer 20 and the ink layer 50 are integrated.
In the laminated film 10 according to Example 8, a fragile processed portion 60 is formed by laser processing. In the laminated film 10 according to Example 8, the groove 60 a of the weakened processed portion 60 has a depth reaching the intermediate portion of the intermediate layer 30 in the thickness direction of the laminated film 10 .

Hereinafter, the configuration of the laminated film 10 according to Example 8 is expressed as "PET12/PET12/easy peel 50". Specifically, the indication “PET12/PET12/easy peel 50” means that a 12 μm PET film as the outer layer 20, a 12 μm PET film as the intermediate layer 30, and a 50 μm easy peel film as the inner layer 40 are formed by a dry lamination method. shows the structure of a laminated film 10 obtained by bonding with an adhesive.

(Comparative example)
The laminated structure of the laminated film 10A of the comparative example will be described below with reference to FIG.
As shown in FIG. 5, the laminate film 10A of the comparative example does not have the intermediate layer 30 as compared with the laminate film 10 according to this embodiment. Specifically, the laminate film 10A of the comparative example is formed by laminating the outer layer 20 and the inner layer 40 together with an adhesive. In addition, in the laminated film 10A of the comparative example, the ink layer 50 is formed on the inner inner surface of the outer layer 20 facing the inner layer 40 . The method for forming the ink layer 50 and the fragile processed portion 60 in the laminated film 10A of the comparative example was the same as the method for forming the ink layer 50 and the fragile processed portion 60 in the laminated film 10 described above.

(Comparative example 1)
Hereinafter, the configuration of the laminated film 10A according to Comparative Example 1 is represented by "PET12/LDPE30". Specifically, the indication “PET12/LDPE30” refers to the structure of the laminated film 10A obtained by bonding the 12 μm PET film of the outer layer 20 and the 30 μm LDPE film of the inner layer 40 with an adhesive by the dry lamination method. indicates

(Comparative example 2)
Hereinafter, the configuration of the laminated film 10A according to Comparative Example 2 is represented by "PET12/CPP40". Specifically, the indication “PET12/CPP40” refers to the structure of the laminated film 10A obtained by bonding the 12 μm PET film of the outer layer 20 and the 40 μm CPP film of the inner layer 40 with an adhesive by the dry lamination method. indicates

(Comparative Example 3)
Hereinafter, the configuration of the laminated film 10A according to Comparative Example 3 is expressed as "PET12/easy peel 50". Specifically, the label “PET12/Easy Peel 50” is a laminated film obtained by bonding a 12 μm PET film as the outer layer 20 and a 50 μm easy peel film as the inner layer 40 with an adhesive by a dry lamination method. 10A structure.

(Performance evaluation of laminated film)
Next, the lid member 110 of the cup container 1 formed using the laminated film 10 according to Examples 1 to 8 described above and the cup container formed using the laminated film 10A according to Comparative Examples 1 to 3 1 and the lid member 110 of No. 1 will be described with reference to Table 1.
Specifically, the laminated films 10A according to Examples 1 to 8 and Comparative Examples 1 to 3 were used to prepare lid members 110, and the prepared lid members 110 were heat-sealed to contain the contents. A cup container 1 was produced by joining to the body portion 100 . After that, the prepared cup container 1 was heated in a microwave oven for a specified time. For the cup container 1 heated for a specified time, the heating state of the contained contents, the state of the lid member 110 of the cup container 1, and the state of the fragile processed portion 60 in the lid member 110 were confirmed.
NE-1901S (product model number, manufactured by Panasonic Corporation in 2011) was used as the microwave oven used to evaluate the performance of the laminated film. The heating condition is to place the cup container 1 in a microwave oven without a turntable and heat it for 2 minutes at an output condition of 1600W. Moreover, the content accommodated in the cup container 1 is 200 g of fried rice.

As a result, as shown in Table 1, in the cup container 1 having the lid member 110 formed using the laminated film 10 according to Examples 1 to 8, "no rupture", "no seal recession", and We were able to confirm the result that "the processed part was opened and steamed".
Here, the definition of "rupture" is defined as a case where the lid material 110 of the cup container 1 is torn apart from the fragile processed portion 60, and a case where the fragile processed portion 60 is torn but extends to a portion other than the fragile processed portion 60. It is assumed that either of the above occurs. For this reason, "no rupture" means that there is no rupture at the joint between the lid member 110 of the cup container 1 and the main body 100 due to heat sealing, and that no part other than the fragile processed portion 60 is torn. . The definition of "seal receding" is defined as a state in which the heat seal is partially peeled off at the joint between the cover member 110 and the edge of the main body 100 by heat sealing. When "seal retreat" occurs and progresses, openings for letting water vapor escape are formed in unintended parts of the cup container 1 other than the fragile processed part 60, and there is a possibility of causing burns due to water vapor, so it is necessary to prevent it. “No seal recession” means that no partial peeling has occurred at the joint between the lid member 110 and the main body 100 due to heat sealing. Also, the phrase “processed portion is open to allow vapor passage” means that an opening is formed in the fragile processed portion 60 of the lid member 110 to allow steam to escape. More specifically, the lid members 110 of the cup containers 1 of Examples 1 to 5 were formed with a plurality of openings 61 spaced apart from each other in the fragile processed portion 60, as shown in FIG. 3(a). . In the lid member 110 of the cup container 1 of Examples 6 to 8, a continuous opening 61 was formed in the fragile processed portion 60, as shown in FIG. 3(b).

In the laminated film 10 according to Examples 1 to 8, since the intermediate layer 30 is formed using the base resin, even if the ink layer 50 is formed over the entire inner surface of the outer layer 20, the laminated film The laminate strength between each of the 10 layers is not degraded. Therefore, it was possible to prevent the cover member 110 from bursting due to an increase in the internal pressure of the cup container 1 during heating by the microwave oven.

On the other hand, in the cup container 1 having the lid member 110 formed using the laminated film 10A according to Comparative Examples 1 to 3, it was confirmed that there was "rupture". That is, it means that, in the lid member 110 formed using the laminated film 10A according to Comparative Examples 1 to 3, the lid member 110 was ruptured at a portion other than the fragile processed portion 60 . In addition, in the cup container 1 having the lid member 110 formed using the laminated film 10A according to Comparative Examples 1 and 2, the result of "no seal recession" was confirmed, but the laminated film 10A according to Comparative Example 3 , confirmed the result that "seal retreated". That is, in the cup container 1 having the lid member 110 using the laminated film 10A according to Comparative Example 3, it was confirmed that the heat seal was partially peeled at the joint portion between the lid member 110 and the main body portion 100 . Further, in the cup container 1 having the lid member 110 formed using any one of the laminated films 10A according to Comparative Examples 1 to 3, the result of "explosion from the processed portion" was confirmed. That is, in the case of the laminated film 10A according to Comparative Examples 1 to 3, the portion other than the fragile processed portion 60 in the lid member 110 of the cup container 1 is torn, and the fragile processed portion 60 is torn. It was confirmed that either the crack extended to the site of

Laminated films 10A according to Comparative Examples 1 to 3 are formed with only the outer layer 20 and the inner layer 40 . Since the laminated film 10A does not have the intermediate layer 30, the ink layer 50 formed between the outer layer 20 and the inner layer 40 reduces the lamination strength between the outer layer 20 and the inner layer 40. For this reason, when the cup container 1 is heated using a microwave oven, the opening 61 for releasing water vapor in the fragile processed portion 60 is not well formed. As a result, when the water vapor in the cup container 1 expands due to the heating and the internal pressure of the cup container 1 rises, the lid member 110 moves to either the fragile processed portion 60 or the joint portion between the lid member 110 and the main body portion 100. There may be sudden bursts with loud pops at one or both sites.

In addition, each of the packaging bag 1A formed using the laminated film 10 according to Examples 1 to 6 described above and the packaging bag 1A formed using the laminated film 10A according to Comparative Example 1 and Comparative Example 2 The results of the performance evaluation are described with reference to Table 2.
Specifically, in each of the packaging bag 1A formed using the laminated films 10 according to Examples 1 to 6 and the packaging bag 1A formed using the laminated films 10A according to Comparative Examples 1 and 2, After containing the contents, the end of the packaging bag 1A was closed and hermetically sealed. Then, the packaging bag 1A containing the contents was heated with a microwave oven at an output of 1600 W for 2 minutes, and the presence or absence of rupture and the state of the opening 61 were checked. The microwave oven used here is the same as the microwave oven used when evaluating the performance of the lid member 110 of the cup container 1 described above.

その結果、表２に示すように、実施例１から実施例６に係る積層フィルム１０を用いて形成された包装袋１Ａにおいて、「破裂なし」、「シール後退なし」、および「加工部が開口し通蒸」という結果を確認できた。一方、比較例１および比較例２に係る積層フィルム１０Ａを用いて形成された包装袋１Ａにおいて、両方とも「破裂あり」、「加工部から破裂」という結果を確認できた。さらに、比較例２に係る積層フィルム１０Ａの場合、「シール後退」という結果も確認できた。

As a result, as shown in Table 2, in the packaging bag 1A formed using the laminated film 10 according to Examples 1 to 6, "no rupture", "no seal retraction", and "processed part opened" It was possible to confirm the result of "passing steam". On the other hand, in the packaging bags 1A formed using the laminated films 10A according to Comparative Examples 1 and 2, it was confirmed that both "ruptured" and "ruptured from the processed portion". Furthermore, in the case of the laminated film 10A according to Comparative Example 2, a result of "seal retraction" was also confirmed.

That is, in the case of the laminated films 10 according to Examples 1 to 6, since the openings 61 are formed only in the fragile processed portions 60 of the laminated films 10, the increase in the internal pressure of the packaging bag 1A may cause the packaging bag 1A to burst. could be prevented. On the other hand, in the laminated films 10A according to Comparative Examples 1 and 2, the openings 61 were not well formed in the fragile processed portions 60, and the laminated films 10A were dislodged with a loud popping sound in portions other than the fragile processed portions 60. All of a sudden it exploded.

Next, for the laminated film 10 according to Example 7 and the laminated film 10A according to Comparative Example 1, the results of confirming the difference in lamination strength between the layers of the laminated film 10 depending on the presence or absence of the intermediate layer 30 are shown. , with reference to Table 3.

積層フィルムの積層構造の各層間のラミネート強度の測定は、ＪＩＳ Ｚ１７０７に準拠して実施し、測定装置は剥離試験機ＥＺ－ＳＸ（島津製作所製）を使用した。ラミネート強度は、試料幅１５ｍｍ当たりの力（Ｎ／１５ｍｍ）として測定し評価した。

The lamination strength between each layer of the lamination structure of the laminated film was measured according to JIS Z1707, using a peel tester EZ-SX (manufactured by Shimadzu Corporation) as a measuring device. Laminate strength was measured and evaluated as force (N/15 mm) per 15 mm sample width.

As shown in Table 3, in the laminated film 10 according to Example 7, the lamination strength between the PET film of the outer layer 20 and the PET film of the intermediate layer 30 was measured with and without the ink layer 50 . Specifically, when the ink layer 50 is formed between the outer layer 20 and the intermediate layer 30, the average laminate strength between the outer layer 20 and the intermediate layer 30 is 2.80 N/15 mm. The "measurement interface state" shown in Table 3 is an index indicating whether or not peeling occurred between different layers to be measured. For example, when the "measured interface state" is "peeling", peeling occurred between different layers to be measured. Further, for example, when the "measurement interface state" is "PET cut", peeling between different layers does not occur, and the force amount to pull the PET film exceeds the tensile breaking strength of the PET film itself, so the PET film is broken. In this case, the lamination strength between different layers in the laminated film cannot be reliably measured, but it can be inferred that the lamination strength is equal to or greater than the tensile breaking strength of the PET film.
As shown in Table 3, in the laminated film 10, when the ink layer 50 is not formed between the outer layer 20 and the intermediate layer 30, the "measured interface state" is "PET cut". It shows that the lamination strength between layers 30 could not be reliably measured. However, as described above, in this case, it can be said that the laminate strength between the outer layer 20 and the intermediate layer 30 is equal to or greater than the tensile strength at break of 2.93 N/15 mm of the PET film.
Furthermore, as shown in Table 3, in the laminated film 10 according to Example 7, the lamination strength between the PET film of the intermediate layer 30 and the easy peel film of the inner layer 40 is 4.67 N/15 mm.

On the other hand, since the laminate film 10A according to Comparative Example 1 did not have the intermediate layer 30, the laminate strength between the PET film of the outer layer 20 and the LDPE film of the inner layer 40 was measured. As a result, in the laminated film 10A according to Comparative Example 1, when the ink layer 50 was formed between the outer layer 20 and the inner layer 40, the average laminate strength between the PET film of the outer layer 20 and the LDPE film of the inner layer 40 was The value is 1.37N/15mm. Further, in the laminated film 10A according to Comparative Example 1, when the ink layer 50 is not formed between the outer layer 20 and the inner layer 40, the average laminate strength between the PET film of the outer layer 20 and the LDPE film of the inner layer 40 is The value is 1.70N/15mm. In the case of the laminated film 10A according to Comparative Example 1, regardless of whether or not the ink layer 50 was formed, the "measured interface state" was "peeling", so the PET film of the outer layer 20 and the LDPE film of the inner layer 40 It can be said that the lamination strength between was measured.

Based on the above measurement results, compared to the laminated film 10A that does not have the intermediate layer 30, in the laminated film 10 according to the present embodiment, the PET film of the intermediate layer 30 and the sealant film (easy peel film) of the inner layer 40 It was confirmed that the lamination strength between was not lowered. That is, in the laminated film 10 having the intermediate layer 30, even if the ink layer 50 is formed over the entire inner surface of the outer layer 20, the lamination strength between the layers of the laminated film 10 can be maintained. As a result, the packaging containers (both the cup container 1 having the lid member 110 and the packaging bag 1A) formed using the laminated film 10 do not explode when heated by a microwave oven, and steam escapes from the packaging bag. The expanded state of the packaging container can be maintained while releasing.

Although the embodiments and examples of the present invention have been described above, the technical scope of the present invention is not limited to the above-described embodiments, and various changes can be made to each component without departing from the scope of the present invention. can be added or deleted, or the configurations of the respective embodiments can be combined.

For example, in the above-described embodiment, an example in which the ink layer 50 is formed on the inner surface of the outer layer 20 of the laminated film 10 has been described, but the present invention is not limited to this. In the laminated film 10 of the present invention, the ink layer 50 may be formed on the outer surface of the intermediate layer 30 , that is, on the surface facing the outer layer 20 . In this case, it is possible to similarly form the fragile processed portion 60 by laser processing.

In the above-described embodiment, an example was described in which each of the outer layer 20 and the intermediate layer 30 was formed as a single layer in the laminated film 10, but the present invention is not limited to this. In the laminated film 10 of the present invention, for example, at least one of the outer layer 20 and the intermediate layer 30 may be formed of multiple layers. In this case, one layer of films constituting the outer layer 20 and the intermediate layer 30 may be formed of a film forming a base layer, such as a PET film, ONy film, or OPP film. In this case, the laminated film 10 can be further provided with, for example, gas barrier properties.

In the above-described embodiment, when forming the laminated film 10, an example of forming the laminated structure of the laminated film 10 by bonding the films using an adhesive by a dry lamination method has been described, but the present invention is not limited to this. . For example, the laminated film 10 may be formed by a sandwich lamination method in which a molten polyethylene-based resin is sandwiched between the outer layer 20 and the intermediate layer 30 for lamination.
When forming the laminated film 10 by this sandwich lamination method, when forming the fragile processed portion 60, the polyethylene resin (for example, LLDPE) of the sandwich layer cannot be laser processed, but the outer layer 20 and the intermediate layer 30 can be laser processed. At least a portion of the sandwich layer is melted by the generated heat, so that the weakened processed portion 60 can be formed as well.

The mode of the fragile processed portion can be variously changed in addition to the above. For example, the fragile processed portion may be formed without removing the outer layer by a so-called half-cut process using a cutting tool such as a rotary die cutter. Moreover, the shape is not limited to a linear segment extending in one direction, and may be formed in a linear shape having a bent or curved portion, or having a plurality of connected segments.

1 Cup container 1A Packaging bag 10, 10A Laminated film 20 Outer layer 30 Intermediate layer 40 Inner layer 50 Ink layer 60 Weak processed part 60a Groove 61 Opening 100 Body part 110 Lid material 200 Roller 300 Inspection camera L1 Length W1 Width

Claims (6)

a heat-sealable inner layer;
an outer layer laminated on the inner layer;
an intermediate layer provided between the inner layer and the outer layer;
an ink layer formed of ink between the outer layer and the intermediate layer;
a fragile processed portion formed within the range of the ink layer and having a depth reaching an intermediate portion in the thickness direction of the intermediate layer;
with
the laminate strength between the intermediate layer and the inner layer is greater than 1.5 N/15 mm;
The intermediate layer is formed of a material having relatively high rigidity as a base layer,
laminated film. a heat-sealable inner layer;
an outer layer laminated on the inner layer;
an intermediate layer provided between the inner layer and the outer layer;
an ink layer formed of ink between the outer layer and the intermediate layer;
a fragile processed portion formed within the range of the ink layer and having a depth reaching an intermediate portion in the thickness direction of the intermediate layer;
with
the laminate strength between the intermediate layer and the inner layer is greater than 1.5 N/15 mm;
The intermediate layer is made of a resin material that can be at least partially removed by laser irradiation as a base layer,
laminated film. The laminate film according to claim 1 or 2, wherein the weakened processed portion has a depth penetrating through the intermediate layer in the thickness direction of the intermediate layer. 4. The laminate film according to any one of claims 1 to 3, wherein the ink layer is formed from the ink capable of reflecting and coloring light having a wavelength of at least 380 nm to 700 nm. 3. The intermediate layer according to claim 1 or 2, wherein the intermediate layer is made of a resin material selected from the group consisting of polyethylene terephthalate (PET), biaxially oriented polypropylene (OPP), and biaxially oriented nylon (ONy). Laminated film as described. A packaging container at least partially comprising the laminated film according to any one of claims 1 to 5 , wherein an opening is formed in the fragile processed portion when heated by a microwave oven.

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