JP7204024B2 - Packages, films and packages containing contents - Google Patents

Description

TECHNICAL FIELD The present invention relates to a package containing contents to be heated in a microwave oven, a film, and a package containing the contents .

BACKGROUND ART Packages are known in which contents are stored and sealed and heated in a microwave oven. However, when the contents of such a package are heated with a microwave oven, the internal pressure increases. For this reason, packages are also known which are provided with means for automatically discharging the steam within the package during microwave heating to reduce the internal pressure of the package.

For example, through holes are provided in a laminated film having a base film and a first sealant layer, linear low-density polyethylene or the like is extrusion-coated on the first sealant layer side, and a second sealant layer is formed. A package body provided with such a structure is known (see, for example, Patent Document 1). In this package, when the internal pressure rises due to microwave heating, the second sealant layer at the portion provided with the through hole expands outward and bursts, opening the hole and releasing the steam in the package.

Further, for example, a package is known which is composed of a laminated film having a heat-sealable seal layer and an outer layer, and has a fragile processed portion in which a part of the outer layer is linearly removed by a laser. (See Patent Document 2, for example). When the internal pressure of this package rises due to heating in a microwave oven, a tear occurs along the fragile processed portion, and minute holes are formed through the inner layer film in the thickness direction, releasing steam within the package.

In addition, there is also a packaging body in which a cut line is provided across a region coated with a release agent on a stretched synthetic resin film and a region not coated with a release agent, and a sealant film is attached to the surface coated with the release agent. known (see, for example, Patent Document 3). In this package, due to the increase in internal pressure caused by heating in a microwave oven, the sealant film in the release agent-applied portion below the stretched film cut line can be freely stretched and spread along the cut line, but the release agent-uncoated portion can be freely stretched and spread. Can not. Therefore, during the heating, stress concentration occurs at the boundary between the cut line of the sealant film and the part where the release agent is not applied, and small holes are formed in the sealant film, thereby releasing the steam inside the package.

Japanese Patent No. 3942709 JP 2015-13441 A Japanese Patent No. 4817583

Since the above-described package has a structure in which a part of the exterior is removed or cut, there is a problem that the gas barrier property against oxygen and the like is lowered. In addition, the decrease in gas barrier properties against oxygen tends to have a particularly large effect when a high barrier film such as a vapor-deposited film, a gas barrier coated film, or a film using a gas barrier resin is used as the base film. Therefore, there is a demand for a package that can stably release the internal pressure, which is increased by steam generated during heating in a microwave oven, without providing through holes or cutting lines in the base film.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a package , a film, and a package containing a content that can stably release the internal pressure during heating in a microwave oven.

According to one aspect of the present invention, the package includes a film including a crystalline stretch-oriented film, and a package provided on the film, formed by heating a part of the crystalline stretch-oriented film, and the crystalline and a breaking portion having a non-oriented portion facing each other across the oriented portion of the stretched and oriented film, and when the internal pressure rises, the portion of the oriented portion sandwiched between the non-oriented portions breaks .

According to one aspect of the present invention, a film is a film used in a package containing a content , comprising: a crystalline stretch-oriented film; and a breaking portion having a non-oriented portion disposed opposite to the oriented portion of the crystalline stretched and oriented film, and when the internal pressure of the package rises, the oriented portion Among them, the portion sandwiched between the non-oriented portions is broken.
According to one aspect of the present invention, the content-filled package includes a film including a crystalline stretch-oriented film, and the film is provided with the content-filled package, and is formed by heating a part of the crystalline stretch-oriented film. and a breakable part having non-oriented parts arranged opposite to each other with the oriented part of the crystalline stretched and oriented film sandwiched therebetween. A body and contents contained within the package.

ADVANTAGE OF THE INVENTION According to this invention, the package which can release an internal pressure stably at the time of a microwave oven heating , a film, and the package containing a content can be provided.

BRIEF DESCRIPTION OF THE DRAWINGS The perspective view which shows the structure of the package which concerns on the 1st Embodiment of this invention. Sectional drawing which shows typically the layer structure of the film used for the package. Perspective view showing an example of use of the package FIG. 4 is a plan view showing the arrangement of a pair of non-oriented portions of Examples 1 to 7 and Comparative Example 1, which is the configuration of the breaking portion of the package. FIG. 10 is a plan view showing the arrangement of a pair of non-oriented portions of Example 8, which is the configuration of the breaking portion of the package. FIG. 11 is a plan view showing the arrangement of a pair of non-orientation portions of Example 9, which is the configuration of the breaking portion of the package. FIG. 10 is a plan view showing the arrangement of a pair of non-orientation portions of Example 10, which is the configuration of the breaking portion of the package. FIG. 11 is a plan view showing the arrangement of a pair of non-orientation portions of Example 11, which is the configuration of the breaking portion of the package. FIG. 11 is a plan view showing the arrangement of a pair of non-oriented portions of Example 12, which is the configuration of the tearing portion of the package. FIG. 11 is a plan view showing the arrangement of a pair of non-oriented portions of Example 13, which is the configuration of the tearing portion of the package. Explanatory drawing which shows the result of the evaluation test 1 of the same package. Explanatory drawing which shows the result of the evaluation test 1 of the same package. Sectional drawing which shows the layer structure of the film of a comparative example used for the evaluation test 2 of the same package. Sectional drawing which shows the layer structure of the film of a comparative example used for the evaluation test 2 of the same package. The perspective view which shows the structure of the package which concerns on the 2nd Embodiment of this invention. The perspective view which shows an example of use of the same package. The top view which shows the structure of the film which concerns on the 3rd Embodiment of this invention. Sectional drawing which shows the structure of the same film. The top view which shows the structure of the film which concerns on the 4th Embodiment of this invention.

(First embodiment)
A package 1 using a film 11 according to a first embodiment of the present invention will be described with reference to FIGS. 1 to 3. FIG.
FIG. 1 is a perspective view showing the configuration of a package 1 according to a first embodiment of the present invention, and FIG. 2 is a cross-sectional view schematically showing the layer configuration of a film 11 used in the package 1. As shown in FIG. FIG. 3 is a perspective view showing a state in which the package 1 is heated in a microwave oven as an example of use.

As shown in FIG. 1, the package 1 is a packaging container for heating in a microwave oven, in which a film 11 having a multi-layered structure having a crystalline stretch-oriented film 21 on the outer surface thereof is formed into a bag shape. The package 1 is, for example, a pillow packaging bag formed by storing contents in a bag-shaped film 11 and sealing the ends with sealing portions 12 .

As a specific example, the package 1 includes a film 11 having a laminated structure having a crystalline stretched orientation film 21 on the outer surface side, a seal portion 12 formed by molding the film 11 into a bag shape and welding the ends, and a seal portion 12 provided on the film 11. and a breaking portion 13 that breaks when the internal pressure rises. Here, the contents include food that is heated by a microwave oven, wet towels that are heated by a microwave oven, and the like, which contain water that is heated by a microwave oven.

The film 11 is configured, for example, in a rectangular shape that can be formed into a bag shape. As shown in FIG. 2, the layer structure of the film 11 is such that a crystalline stretch-orientation film 21, an adhesive layer 22, and a sealant film 23 are arranged from the outer surface side of the package 1 when the package 1 is formed. Prepare. In addition, the crystalline stretched and oriented film 21 includes a non-oriented portion 21a formed by heating a part thereof to the melting point or higher. The non-oriented portion 21a constitutes a portion of the breaking portion 13. As shown in FIG. The non-oriented portion 21 a is configured in various shapes depending on the configuration of the fracture portion 13 .

The crystalline stretched and oriented film 21 is composed of a general-purpose biaxially stretched film such as, for example, a biaxially stretched PET film, a biaxially stretched NY film, and a biaxially stretched PP film. Other preferred examples of the crystalline stretched orientation film 21 include biaxially stretched films having barrier properties such as biaxially stretched PVA film and biaxially stretched EVOH film, PP/EVOH/PP, NY/EVOH/ A coextruded biaxially stretched film having a barrier resin such as NY, NY/MXD-NY/NY, etc. in an intermediate layer. In addition, a film obtained by coating a general-purpose biaxially stretched film with a PVA-based, PVDC, or PAA-based barrier resin, or a hybrid coated film in which an inorganic substance is dispersed in the above-mentioned barrier resin can also be suitably used as the crystalline stretched orientation film 21. . The thickness of the crystalline stretched and oriented film 21 is preferably 12 μm or more and 50 μm or less.

This is because if the thickness of the crystalline stretched and oriented film 21 is less than 12 μm, the physical strength of the package 1 may be lowered, and the film forming technique is difficult, resulting in an increase in cost. Also, when the thickness of the crystalline stretch-oriented film 21 exceeds 50 μm, the film 11 including the crystalline stretch-oriented film 21 becomes difficult to stretch.

The non-oriented portion 21a is formed by heating the crystalline stretched and oriented film 21 to the melting point or higher to eliminate the orientation. That is, the crystalline stretched and oriented film 21 of the film 11 has the non-oriented portion 21a in part of the oriented portion 21b that is not heated to the melting point or higher.

As a heating method of the crystalline stretched and oriented film 21 for forming the non-oriented portion 21a in the crystalline stretched and oriented film 21, a method such as hot plate heating, impulse heating, laser beam heating, or near-infrared heating can be used. preferable. For example, in hot plate heating or impulse heating, a treatment such as Teflon (registered trademark) surface treatment is applied so that part of the melted resin of the crystalline stretched orientation film 21 and the resin of the sealant film 23 does not adhere to the presser head. It is preferable to do it in the department. For example, in the case of hot plate heating, the crystalline stretched and oriented film 21 is heated with a presser head (hot plate) whose temperature is set at a temperature equal to or higher than the melting point of the crystalline stretched and oriented film 21, thereby melting and heating the non-oriented portion 21a. to form

Laser light heating and near-infrared heating have the advantage of being able to heat the crystalline stretched and oriented film 21 in a non-contact manner, but laser light heating is preferred because it allows local heating. If the crystalline stretched and oriented film 21 to be used has poor laser light absorptivity and it is difficult to form the non-oriented portion 21a, the crystalline stretched and oriented film 21 may contain a laser light absorbing material that improves the laser light absorptivity. may be blended into the material of the crystalline stretch-oriented film 21 in advance, or the crystalline stretch-oriented film 21 may be coated with a laser light absorbing material.

As for the type of laser light, it is preferable to use a carbon dioxide laser because most of the resin materials used for the crystalline stretched and oriented film 21 have relatively high absorption. The laser light absorbing material can be appropriately selected according to the type of laser light. These heating methods can be appropriately selected depending on the material of the crystalline stretched and oriented film 21 to be used.

Whether or not the formed non-oriented portion 21a is properly formed so as to be non-oriented can be judged by inspecting the formed crystalline stretched and oriented film 21 . As this inspection method, crystallinity measurement by X-ray diffraction, FT-IR, DSC, or the like, an orientation viewer using a polarizing plate, or the like can be used.

In such a crystalline stretched and oriented film 21, the breaking elongation of the oriented portion 21b is set to 200% or less, and the breaking elongation of the non-oriented portion 21a is set to 300% or more.

The adhesive layer 22 can be used by appropriately selecting from general dry lamination adhesives for food use. However, since the package 1 is used for heating in a microwave oven, the adhesive layer 22 preferably has heat resistance. The thickness of the adhesive layer 22 is preferably 2 μm to 5 μm from the viewpoint of performance and economy.

The sealant film 23 is composed of, for example, an unstretched low-density polyethylene (LDPE) film, an unstretched linear low-density polyethylene (LLDPE) film, an unstretched polypropylene (PP) film, an unstretched polyethylene terephthalate film, or the like. The thickness of the sealant film 23 is preferably 10 μm or more and 100 μm or less. It should be noted that the thickness of the sealant film 23 is more preferably 20 μm or more and 60 μm or less.

This is because if the thickness of the sealant film 23 is less than 10 μm, the sealing strength is low, and there is a risk that the sealing portion 12 will break before the breaking portion 13 breaks due to microwave heating. In addition, if the thickness of the sealant film 23 exceeds 100 μm, it becomes difficult to stretch, and there is a possibility that the reliability of steam release may be a problem.

The seal portion 12 is formed by heat-sealing the film 11 at its ends.

The breaking portion 13 is provided in a part of the film 11, extends in a linear shape such as a straight line or a curved line, is provided singularly, and is provided with a non-oriented portion 21a having a shape in which two portions of the breaking portion 13 are opposed to each other with a predetermined gap therebetween. or a plurality of non-oriented portions 21a are arranged to face each other. That is, the broken portion 13 is not heated to the melting point or higher of the crystalline stretched and oriented film 21, in other words, the oriented portion 21b of the oriented crystalline stretched and oriented film 21 is interposed so that part of the non-oriented portion 21a faces the broken portion 13. It consists of

As a specific example, as shown in FIGS. 4 to 10, one or more non-orientation portions 21a having short sides and long sides are provided. When one non-oriented portion 21a is provided, the non-oriented portion 21a is arranged such that the short sides of the non-oriented portion 21a face each other with a predetermined interval therebetween, or the short sides and the long sides of the non-orientation portion 21a face each other with a predetermined interval. opposite. When two non-oriented portions 21a are provided, the short sides of the two non-oriented portions 21a face each other with a predetermined interval, or the short sides of one non-oriented portion 21a and the other The long sides of the non-oriented portion 21a face each other with a predetermined gap. Similarly, when three or more non-oriented portions 21a are provided, any two of the non-oriented portions 21a or three or more of the non-oriented portions 21a are separated from each other by a predetermined interval between the short sides or between the short sides and the long sides. opposite. When a plurality of non-oriented portions 21a are provided in the fracture portion 13, it is preferable that the non-oriented portions 21a have the same size and shape. may be

More specifically, the fracture portion 13 is formed such that one or more non-oriented portions 21a where the crystalline stretched and oriented film 21 is heated are separated from each other by a predetermined distance across the oriented portion 21b having the orientation of the crystalline stretched and oriented film 21. Constructed in close proximity at a distance. Here, the predetermined distance can be appropriately set as long as it is a distance at which the fracture portion 13 is fractured during microwave heating, but is preferably less than 5 mm. Moreover, the long sides and the short sides are not limited to straight lines, and may be curved lines. That is, the broken portion 13 is formed in a shape in which the non-oriented portion 21a extends in one direction, and one end of one non-oriented portion 21a is connected to another part of the non-oriented portion 21a or another non-oriented portion 21a. It may face a part of the portion 21a with a predetermined gap. A part of the oriented portion 21b sandwiched between the opposing non-oriented portions 21a may be non-oriented as long as the steam port 21c can be formed.

In addition, the shape of one non-orientation portion 21a may be a partially notched circular ring, polygonal ring, or the like. The two non-orientation portions 21a are, for example, formed in a straight line and opposed to each other such that the short sides intersect each other in a straight line or at a predetermined angle, or the short side and the long side are opposed to each other in a T shape. configuration is conceivable. In addition, the two non-orientation portions 21a may have a wavy configuration other than the straight configuration.

In consideration of the manufacturing cost and the like, it is preferable that the non-orientation portions 21a are formed in a rectangular shape elongated in one direction and provided as a pair, with the short sides facing each other, as shown in FIG. The non-oriented portion 21a shown in FIG. 4 has a short side length of 0.5 to 10 mm and a long side length of 3 to 100 mm. is preferably set within a short range, and is appropriately selected depending on the size of the bag and the structure of the laminate. In addition, the distance between the opposing short sides of the two non-oriented portions 21a is set to less than 5 mm, and more preferably set to 0.5 to 3.0 mm. Select accordingly.

This is because if the dimension of the non-oriented portion 21a is less than the specified range, the range of elongation is too narrow, and there is a risk that steam venting may not be activated well. This is because there is a fear. If the distance between the opposing short sides of the two non-oriented portions 21a is less than this range, the tips of the opposing linear non-oriented portions may be integrated with each other and the steam port 21c may not be formed, resulting in bursting. Moreover, if the range is exceeded, the region between the opposing short sides of the two non-oriented portions 21a cannot be stretched, so the rupture portion 13 does not rupture and the package 1 cannot form the steam port 21c. This is because there is a risk of bursting.

Next, a method for manufacturing and using such a package 1 will be described.
First, a part of the film 11 is heated to the melting point or higher of the crystalline stretched and oriented film 21 to partially lose the orientation of the crystalline stretched and oriented film 21 to form a non-oriented portion 21a having a predetermined shape. As a specific example, a portion of the film 11 is irradiated with a laser beam such as a carbon dioxide laser with an output that makes the crystalline stretched and oriented film 21 above its melting point. Next, the shape of the non-oriented portion 21a to be formed is scanned with a laser beam. For example, when forming a pair of non-oriented portions 21a, a laser beam is scanned in the shape of one of the non-oriented portions 21a, then the irradiation of the laser beam is stopped, and the other non-oriented portion 21a is formed. is irradiated with the laser beam again. Next, the shape of the other non-orientation portion 21a is scanned with a laser beam. Through these steps, a portion of the film 11 is heated to form the non-oriented portion 21a.

Next, the film 11 is formed into a bag and the contents are placed inside the bag. Then, the ends of the film 11 are heat-sealed to form the sealed portion 12, thereby forming the hermetically sealed bag-like package 1. As shown in FIG.

The package 1 containing the contents in this way is placed in a microwave oven, and then the contents are heated by the microwave oven. When the contents are heated by a microwave oven, steam is generated from the contents, the internal pressure rises, the package 1 expands, and the film 11 stretches. When the film 11 is stretched, the opposite short sides or the opposite short and long sides of the non-oriented portion 21a of the breaking portion 13 shown in FIG. , the internal pressure is reduced and the steam is vented.

Next, the function of breaking the breaking portion 13 and discharging steam from the package 1 will be described. When the package 1 packed with contents containing moisture is heated in a microwave oven, steam is generated from the contents, the internal pressure rises, and as a result the package 1 expands. At this time, since LDPE, LLDPE, CPP, etc. used for the sealant film 23 are usually unstretched, that is, unoriented, they have lower tensile strength and higher elongation at break than stretched films. On the other hand, the crystalline stretch-oriented film 21 usually has a high tensile strength and a low elongation at break.

However, the non-oriented portion 21a of the crystalline stretched and oriented film 21 is a non-oriented region in which the crystalline stretched and oriented film 21 is in a non-oriented state. The tensile strength is low compared to the area. Therefore, when the internal pressure rises, the package 1 expands, and the film 11 expands, the film 11 in the region of the non-oriented portion 21a expands in the width direction due to stress concentration.

At this time, the film 11 in the region of the oriented portion 21b located between the opposing short sides or between the opposing short and long sides of the non-oriented portion 21a also extends following the elongation of the region of the non-oriented portion 21a. The numerical value of the breaking elongation is higher in the region of the oriented portion 21a. As a result, when the film 11 is stretched to a certain extent, the region including the oriented portion 21b located between the opposing short sides of the non-oriented portion 21a or between the opposing short and long sides of the non-oriented portion 21a is stretched first due to the difference in breaking elongation. ruptures, creating small holes that allow water vapor to escape. Steam is discharged from the package 1 using this small hole as a steam port 21c.

According to the package 1 configured in this manner, the breaking portion 13 is provided to arrange the film 11 between the short sides or the short and long sides of the non-oriented portion 21a with the oriented portion 21b having a predetermined width therebetween. , the breaking portion 13 breaks when heated in a microwave oven, and steam can be discharged. In addition, by providing the breaking portion 13 on the upper surface of the package 1, i.e., on the upper surface of the package 1 when placed in a microwave oven, the steam vent 21c generated when the breaking portion 13 is broken can be released from the contents. can be prevented from leaking out.

For example, even if food containing a large amount of liquid is contained in the packaging body 1, the packaging body 1 is provided with the breaking part 13 on the surface positioned above when placed in the microwave oven. is broken to form the steam port 21c on the upper surface of the package 1 placed in the microwave oven, so that the liquid can be prevented from leaking to the outside. However, in a mode of use in which the liquid may leak, such as when the package 1 is placed on a plate and heated in a microwave oven, the breaking portion 13 is provided on the lower surface side or the side surface side of the package 1. may be

Moreover, the package 1 can prevent the sealing portion 12 from being heated by steam discharged at the time of breaking by providing the breaking portion 13 near the center of the upper surface. That is, when the user transports the package 1 after microwave heating, it is often the case that the sealed portion 12 is held while transporting, and since the sealed portion 12 is not heated by the steam, the sealed portion 12 is prevented from becoming hot. Since the user can hold the seal part 12 and carry the package 1, the usability is good. However, the breaking part 13 is not limited to being provided in the central part of the package 1, and the position can be appropriately set depending on the usage mode. It is also possible to define the portion to be pinched by the shape of the package 1 or the shape of the seal portion 12, and arrange the breaking portion 13 so as to avoid the portion.

Next, the evaluation test 1 and the evaluation test 2 of the package 1 using the film 11 configured as described above and the evaluation results thereof will be described below. In addition, the evaluation test is for making the features of the present invention more specific, and the scope of the present invention is not limited to the following examples. Schematic diagrams of the shape and arrangement of the non-oriented portion 21a in Evaluation Test 1 are shown in FIGS. 4 and 11. FIG.

[Evaluation Test 1]
Packages 1 of Examples 1 to 13 and Comparative Examples 1 to 5 are prepared by packing tissue in which 10 g of tap water is impregnated. Next, the package 1 is heated in a microwave oven (Hitachi Ltd.: MRO-MS7) at an output of 500 W, and the breaking part 13 is broken and the steam port 21c is generated. Those in which other parts were broken without being broken were evaluated as x. Also, the maximum width of the steam port 21c was measured.

The non-oriented portion 21a of each prepared package 1 was identified, and the package 1 in which it was confirmed that the non-oriented portion 21a was generated was used.

[Example 1]
As Example 1, the package 1 and the film 11 having the following configurations were used. A biaxially stretched PET film (Toyobo Co., Ltd.: E5100) with a thickness of 12 μm was used as the crystalline stretched orientation film 21 . As the sealant film 23, an LLDPE film (Toyobo Co., Ltd.: L4102) having a thickness of 40 μm was used. As the adhesive layer 22, the crystalline stretching orientation film 21 and the sealant film 23 were laminated using a urethane-based dry laminate adhesive, and aged in a constant temperature bath at 38°C for 3 days to obtain the film shown in FIG. 11 was created.

The crystalline stretched orientation film 21 of this film 11 and the position near the center of the upper surface side of the package 1 are heated by a carbon dioxide laser to form a pair of non-oriented portions 21a as shown in FIG. formed. The non-oriented portion 21a has a rectangular shape elongated in one direction, with a long side length of 15 mm and a short side length of 2 mm. placed in The distance between the opposing short sides of the pair of non-oriented portions 21a (distance between proximity) was set to 2 mm.

Using this film 11, a pillow packaging bag having a size of 160 mm×260 mm as shown in FIG.

[Example 2]
As the package 1 and the film 11 of Example 2, those having the following configurations were used. The materials of the crystalline stretched and oriented film 21, the adhesive layer 22 and the sealant film 23, the shape of the non-oriented portion 21a, and the shape of the package 1 were the same as in Example 1, but the pair of non-oriented portions 21a were opposite to each other. The distance between the short sides (distance between proximity) was set to 1 mm.

[Example 3]
As the package 1 and the film 11 of Example 3, those having the following configurations were used. The materials of the crystalline stretched and oriented film 21, the adhesive layer 22 and the sealant film 23, the shape of the non-oriented portion 21a, and the shape of the package 1 were the same as in Examples 1 and 2, but a pair of non-oriented The distance between the opposing short sides of the portion 21a (distance between proximity) was set to 4 mm.

[Example 4]
As the package 1 and the film 11 of Example 4, those having the following configurations were used. The materials of the crystalline stretched and oriented film 21, the adhesive layer 22 and the sealant film 23, and the shape of the package 1 were the same as in Examples 1 to 3, but the non-oriented portion 21a had a long side of 8 mm and a short side. The length of each side was set to 2 mm, and the distance between the opposing short sides of the pair of non-oriented portions 21a (distance between proximity) was set to 2 mm.

[Example 5]
As the package 1 and the film 11 of Example 5, those having the following configurations were used. The materials of the crystalline stretched and oriented film 21, the adhesive layer 22 and the sealant film 23, and the shape of the package 1 were the same as in Examples 1 to 4, but the long side of the non-oriented portion 21a was 20 mm and the short side was 20 mm. The length of the side was set to 2 mm, and the distance between the opposing short sides of the pair of non-oriented portions 21a (distance between proximity) was set to 1 mm.

[Example 6]
As the package 1 and the film 11 of Example 6, those having the following configurations were used. The materials of the crystalline stretched and oriented film 21 and the adhesive layer 22, the shape of the non-oriented portion 21a, the distance between the opposite short sides of the pair of non-oriented portions 21a (distance between close proximity), and the shape of the package 1 are implemented. The same as in Example 5, but a cast polypropylene (CPP) (Toyobo Co., Ltd.: P1128) having a thickness of 30 μm was used as the sealant film 23 .

[Example 7]
As the package 1 and the film 11 of Example 7, those having the following configurations were used. The material of the adhesive layer 22, the shape of the non-oriented portion 21a, the distance between the opposite short sides of a pair of non-oriented portions 21a (close distance), and the shape of the package 1 were the same as in Example 5. A biaxially stretched PP film (Mitsui Chemicals Tocello Co., Ltd.: OP U-1) having a thickness of 20 μm was used as the crystalline stretched orientation film 21 . As the sealant film 23, a 30 μm-thick opaque polyethylene film (Lamilon 2-CWW: Sekisui Film Co., Ltd.) was used. Also, a pair of non-oriented portions 21a were formed on the crystalline stretched and oriented film 21 of the film 11 at a position near the center of the upper surface of the package 1 by heating with a hot plate.

[Example 8]
As Example 8, the package 1 and the film 11 having the following configurations were used. The materials of the crystalline stretch-orientation film 21, the adhesive layer 22 and the sealant film 23, and the shape of the package 1 were the same as in Example 1.

The non-oriented portion 21a has a rectangular shape elongated in one direction, with a long side length of 15 mm and a short side length of 2 mm. However, the pair of non-orientation portions 21a were linearly arranged so that they were displaced in the direction perpendicular to the axis and their longitudinal directions were the same. The distance between the opposing short sides of the pair of non-oriented portions 21a (distance between proximity) was set to 1 mm. Here, the inter-proximity distance is the distance connecting the centers of the short sides of the pair of non-oriented portions 21a.

[Example 9]
As Example 9, the package 1 and the film 11 having the following configurations were used. The materials of the crystalline stretch-orientation film 21, the adhesive layer 22 and the sealant film 23, and the shape of the package 1 were the same as in Example 1.

The non-orientation portion 21a had a rectangular shape elongated in one direction, with a long side length of 15 mm and a short side length of 2 mm. Further, as shown in FIG. 6, a pair of non-oriented portions 21a are provided, and the other non-oriented portion 21a is rotated 135 degrees with respect to one of the non-oriented portions 21a. The distance between the short sides (distance between proximity) was set to 2 mm. Here, the inter-proximity distance is the distance connecting the centers of the short sides of the pair of non-oriented portions 21a.

[Example 10]
As Example 10, the package 1 and the film 11 having the following configurations were used. The materials of the crystalline stretch-orientation film 21, the adhesive layer 22 and the sealant film 23, and the shape of the package 1 were the same as in Example 1.

The non-orientation portion 21a had a rectangular shape elongated in one direction, with a long side length of 15 mm and a short side length of 2 mm. Further, as shown in FIG. 7, a pair of non-oriented portions 21a are provided, and the other non-oriented portion 21a is rotated 90 degrees with respect to one of the non-oriented portions 21a. The distance between the short sides (distance between proximity) was set to 2 mm. Here, the inter-proximity distance is the distance connecting the centers of the short sides of the pair of non-oriented portions 21a.

[Example 11]
As Example 11, the package 1 and the film 11 having the following configurations were used. The materials of the crystalline stretch-orientation film 21, the adhesive layer 22 and the sealant film 23, and the shape of the package 1 were the same as in Example 1.

The non-orientation portion 21a had a rectangular shape elongated in one direction, with a long side length of 15 mm and a short side length of 2 mm. Further, as shown in FIG. 8, a pair of non-oriented portions 21a are provided, and the other non-oriented portion 21a is rotated 90 degrees with respect to one of the non-oriented portions 21a. The side was opposed to the center of the long side of the other non-oriented portion 21a, and the distance between the opposed short side and long side (distance between proximity) was 1 mm. Here, the distance between proximity is the shortest distance from the center of the short side of the pair of non-oriented portions 21a to the long side.

[Example 12]
As Example 12, the package 1 and the film 11 having the following configurations were used. The materials of the crystalline stretch-orientation film 21, the adhesive layer 22 and the sealant film 23, and the shape of the package 1 were the same as in Example 1.

As shown in FIG. 9, the non-orientation portion 21a has a curved wavy shape with a longitudinal width (long side) of 20 mm and an end width (short side) of 2 mm. Also, a pair of non-oriented portions 21a were provided, the short sides of which were opposed to each other, and the distance between the opposed short sides (distance between proximity) was set to 2 mm.

[Example 13]
As Example 13, the package 1 and the film 11 having the following configurations were used. The materials of the crystalline stretch-orientation film 21, the adhesive layer 22 and the sealant film 23, and the shape of the package 1 were the same as in Example 1.

As shown in FIG. 10, the non-orientation portion 21a has a partially notched circular ring shape with a circumferential length (long side) of 60 mm, an end width (short side) of 1.5 mm, and a short side of 60 mm. were opposed to each other, and the distance between the opposed short sides (distance between proximity) was set to 1 mm.

[Comparative Example 1]
As the package 1 and the film 11 of Comparative Example 1, those having the following configurations were used. The materials of the crystalline stretched and oriented film 21, the adhesive layer 22 and the sealant film 23, the shape of the non-oriented portion 21a, and the shape of the package 1 were the same as in Example 1, but the pair of non-oriented portions 21a were opposite to each other. The distance between the short sides (distance between proximity) was set to 5 mm.

[Comparative Example 2]
As shown in FIG. 12, the package 1 and the film 11 of Comparative Example 2 had the following configurations. The materials of the crystalline stretched and oriented film 21, the adhesive layer 22 and the sealant film 23, the shape of the non-oriented portion 21a, and the shape of the package 1 were the same as in Example 1, but the non-oriented portion 21a was oriented in one direction. Only one long rectangular shape was provided.

[Comparative Example 3]
As shown in FIG. 12, the package 1 and the film 11 of Comparative Example 3 had the following configurations. The materials of the crystalline stretched and oriented film 21, the adhesive layer 22 and the sealant film 23, the shape of the non-oriented portion 21a, and the shape of the package 1 were the same as in Example 1, but the pair of non-oriented portions 21a were long. The sides were made to face each other, and the distance between the opposing long sides was 1 mm.

[Comparative Example 4]
As shown in FIG. 12, the package 1 and the film 11 of Comparative Example 4 had the following configurations. The materials of the crystalline stretched and oriented film 21, the adhesive layer 22 and the sealant film 23, the arrangement of the non-oriented portion 21a, and the shape of the package 1 were the same as in Comparative Example 3, but the non-oriented portion 21a was on the long side. The length was set to 8 mm.

[Comparative Example 5]
As shown in FIG. 12, the package 1 and the film 11 of Comparative Example 5 had the following configurations. The materials of the crystalline stretched and oriented film 21, the adhesive layer 22 and the sealant film 23, and the shape of the package 1 were the same as in Comparative Example 3, but the non-oriented portion 21a had four sides of the same length and one side 5 mm, and a pair of non-oriented portions 21a are arranged so that one side faces each other. Also, the distance between the opposing sides of the pair of non-oriented portions 21a was set to 1 mm.

[Results of Evaluation Test 1]
As shown in FIGS. 11 and 12, in all of Examples 1 to 13, the oriented portions 21b between the short sides of the non-oriented portions 21a or between the short and long sides of the non-oriented portions 21a were broken, A steam port 21c was formed, and stable steam venting was achieved. Note that the steam port 21c was a relatively small hole, as shown in FIGS. 11 and 12 showing the width of the largest steam port 21c.

On the other hand, in Comparative Example 1, when heated in a microwave oven, one non-oriented portion 21a was broken over the entire area with a loud sound, and steam could not be vented stably.

In Comparative Examples 2 to 5, the package 1 broke with a loud sound when heated in a microwave oven, but the break did not occur between the pair of non-oriented portions 21a.

From the results of these evaluation tests 1, it was found that by configuring the package 1 according to the present embodiment, steam can be stably vented, and the breaking portion 13 can be broken to form the steam port 21c. became clear.

[Evaluation test 2]
As Evaluation Test 2, the following Tests 2-1 and 2-2 were used to evaluate the gas barrier properties of the film 11 of the present embodiment.

[Test 2-1]
A 15-μm-thick biaxially-stretched nylon film coated with a gas barrier layer on one side (Unitika Ltd.: Emblem HG) was used as the crystalline stretched orientation film 21, and a 50-μm-thick linear low-density sealant film 23 was used. Using a polyethylene (LLDPE) film (Toyobo Co., Ltd.: L-6100), a urethane-based dry laminate adhesive was used to laminate the gas barrier layer inside, and then aged for 3 days in a constant temperature bath at 38 ° C. Film 11 was obtained. The crystalline stretched orientation film 21 of this film 11 was heated to the melting point by a carbon dioxide laser to form a pair of rectangular non-oriented portions 21a elongated in one direction with a long side of 15 mm and a short side of 2 mm. As shown in FIG. 4, the pair of non-oriented portions 21a are arranged linearly so that the short sides face each other, and the distance between the opposing short sides of the pair of non-oriented portions 21a (distance between proximity) is set to 1 mm. and Thus, the film 11 of Example 14 was produced. Before conducting Test 2-1, a package 1 using the film 11 was produced, and the same evaluation as in Example 1 of Evaluation Test 1 was conducted to confirm that steam escaped without problems.

As Comparative Example 6, a film 11 made of the same material as in Example 14 was irradiated with a carbon dioxide laser, and as shown in FIG. A film 11A including the outer layer removed portion 21d was formed.

In addition, a film 11B made of the same material as in Example 14 and having no non-oriented portion 21a was produced as a blank 1. Note that the film 11B is not shown because it does not have the non-oriented portion 21a of the film 11. FIG.

The film 11 of Example 14, the film 11A of Comparative Example 6, and the film 11B of Blank 1 were subjected to a gas permeation measurement device "GTR-30XA1BD" manufactured by GTR Tech Co., Ltd., according to JIS K-7126-1, at 23 ° C. × Each of the films 11, 11A, and 11B was set under the condition of 0% RH, and the oxygen permeability (cc/m2·day·atm) was measured. The measurement position of the oxygen permeability at this time was the non-oriented portion 21a of the film 11, the region where the outer layer was removed (outer layer removed portion) 21d of the film 11A, and an arbitrary region of the film 11B. At this time, the transmission area at the time of measurement was a circular region with a diameter of 4.4 cm, that is, a circular region with an area of 15.12 cm. The ratio of the area of the linear non-oriented portion to the area is 4%. On the other hand, since the area of the region 21d from which the outer layer is removed in Comparative Example 6 is about 0.06 cm 2 , the ratio of the area of the region 21d from which the outer layer is removed to the transmission area is 0.4%.

[Results of Test 2-1]
The oxygen permeability measured in Example 14 was 1.39 (cc/m2·day·atm). On the other hand, the oxygen permeability measured in Blank 1 was 1.01 (cc/m2·day·atm), and the oxygen permeability measured in Comparative Example 6 was 15.38 (cc/m2·day·atm). atm). In the film 11 of Example 14 provided with the non-oriented portion 21a, the oxygen permeability was slightly increased with respect to the film 11B of the blank 1 without the non-oriented portion 21a, but the value was almost the same level. In the film 11A of Comparative Example 6 provided with the region 21d from which the outer layer was removed, the oxygen permeability was greatly increased.

From Test 2-1, it was found that the oxygen permeability hardly increased even if the non-oriented portion 21a was provided.

[Test 2-2]
Executed in the same manner, materials, and shape as Test 2-1 except that the crystalline stretched and oriented film 21 was a 15 μm thick coextruded biaxially stretched film (Gunze Co., Ltd.: HPB) composed of NY/EVOH/NY. A film 11 including the non-oriented portion 21a of Example 15 was produced. For the film 11 of Example 15, in the same manner as in Example 14, before performing Test 2-2, a package 1 using the film 11 was produced, and the same evaluation as in Example 1 of Evaluation Test 1 was performed to determine whether steam It was confirmed that a port 21c was formed and steam escaped.

As Comparative Example 7, as shown in FIG. 14, the crystalline stretched and oriented film 21 was coated with a release agent 51, and the crystalline stretched and oriented film 21 was cut with a cutter to a length of 40 mm in the region where the release agent 51 was provided. A film having an outer layer cut portion 21e of Comparative Example 7 in which a cut outer layer cut portion 21e is provided, the surface coated with the release agent 51 is opposed to the sealant film 23, and the adhesive layer 22 is adhered to the sealant film 23. 11A was produced. For the sealant film 23, a 50 μm-thick linear low-density polyethylene (LLDPE) film (Toyobo Co., Ltd.: L-6100) was used. As in Test 2-1, a film 11B having the same configuration as in Example 15 and not including the non-oriented portion 21a was produced as a blank 2.

The film 11 of Example 15, the film 11A of Comparative Example 7, and the film 11B of Blank 2 were measured in the same manner as in Test 2-1 by GTR Tech's gas permeation measurement device "GTR-30XA1BD". 7126-1, the films 11, 11A, and 11B were set under the conditions of 23° C.×0% RH, and the oxygen permeability (cc/m2·day·atm) was measured. At this time, the oxygen permeability was measured at the non-oriented portion 21a for the film 11, at the region including the outer layer cut portion 21e for the film 11A, and at an arbitrary region for the film 11B.

[Results of Test 2-2]
The oxygen permeability measured in Example 15 was 1.61 (cc/m2·day·atm). On the other hand, the oxygen permeability measured in Blank 2 was 1.54 (cc/m2·day·atm), and the oxygen permeability measured in Comparative Example 7 was 8.05 (cc/m2·day·atm). atm). In the film 11 of Example 15 provided with the non-oriented portion 21a, the oxygen permeability was slightly increased with respect to the film 11B of the blank 2 without the non-oriented portion 21a, but the value was almost the same level. In the film 11A of Comparative Example 7 provided with the cut portion 21e of the outer layer, the oxygen permeability was greatly increased.

From the results of Test 2-2, it was clarified that even if the non-oriented portions 21a were provided, the oxygen permeability hardly increased, as in Test 2-1.

[Results of Evaluation Test 2]
As is clear from the results of Tests 2-1 and 2-2 described above, according to the film 11 and the package 1 of the present embodiment, the oxygen permeability increases even when the non-oriented portion 21a is provided. It was found to have a suitable gas barrier property.

According to the package 1 configured in this way, the internal pressure can be stably released without generating a loud noise during microwave heating, and a suitable gas barrier property can be obtained.

It should be noted that the present invention is not limited to the above embodiments. Other embodiments of the present invention will be described below.

(Second embodiment)
Next, a packaging body 1A according to a second embodiment of the invention will be described with reference to FIGS. 15 and 16. FIG. As shown in FIGS. 15 and 16, the package 1A includes a bottomed cylindrical resin container 15 and a lid 16 that covers the opening of the resin container 15. The lid 16 is made of the film 11. be. That is, the package 1A uses the film 11 having the breakage portion 13 provided in the lid covering the opening of the resin container 15 .

The resin container 15 is configured, for example, in the shape of a rectangular truncated cylinder with a bottom, and has a flange portion 15a at the opening. The lid 16 is heat-sealed to the flange portion 15a of the resin container 15 containing the contents. The lid body 16 is composed of the film 11 formed in the outer shape of the flange portion 15a, and the breaking portion 13 is arranged in the center.

The results of evaluation test 1 using such package 1A are shown below.

A 12 μm thick biaxially stretched polyethylene terephthalate (PET) film (Toyobo Co., Ltd.: E5100) was used as the crystalline stretched orientation film 21, and a 50 μm thick easy peel film (DIC Corporation: E3701T) was used as the sealant film 23. A urethane-based dry lamination adhesive was used as the agent layer 22, and after lamination, aging was performed for 3 days in a constant temperature bath at 38°C to produce a film 11. A pair of non-oriented portions 21a each having a long side of 20 mm and a short side of 1 mm are formed on the film 11 by a carbon dioxide laser. bottom. The film 11 was cut into a size of 115 mm×115 mm so that the pair of non-oriented portions 21a were at the center, and the lid body 16 was produced.

As the resin container 15, a PP rectangular container of 110 mm×110 mm and 30 mm in depth is used, and tissue soaked with 10 g of tap water is put into the container, and the lid 16 is heat-sealed and welded to the opening of the resin container 15. Then, the resin container 15 was sealed. This packaging container was heated with a microwave oven [Hitachi Ltd.: MRO-MS7] at an output of 500W. As a result, as the internal pressure inside the package 1A rises, the region (broken portion) including the non-oriented portion 21a expands, and the region including the oriented portion 21b between the short sides of the pair of non-oriented portions 21a breaks, resulting in steam. A port 21c was formed and water vapor escaped from the steam port 21c. At this time, the width of the steam port 21c was 2 mm.

The package 1A configured in this way produces the same effects as the package 1 described above. In addition, since the package 1A has the breaking portion 13 at the central portion of the lid 16, steam is not vented from the flange portion 15a, so the flange portion 15a is not heated by steam. As a result, the package 1A can be transported by the user holding the flange portion 15a after being heated, thereby improving usability.

(Third Embodiment)
Next, the film 11C used for the package 1, 1A according to the third embodiment of the present invention will be described with reference to FIGS. 17 and 18. FIG. In addition, among the configurations of the film 11C according to the third embodiment, the same configurations as those of the film 11 according to the first and second embodiments described above are denoted by the same reference numerals, and detailed description thereof is as follows. omitted.

The film 11C is configured in a shape that can be used for the packages 1, 1A. As shown in FIGS. 17 and 18, the film 11C includes a crystalline stretch-oriented film 21, an adhesive layer 22, and a sealant film 23 from the outer surface side of the package 1 when the package 1 is formed. Prepare. The film 11C also has a laser light absorbing portion 24 .

The laser light absorbing portion 24 is a portion having a high absorption property for the irradiated laser light. For example, the laser light absorbing portion 24 is formed by printing ink or the like having high laser light absorption. As a specific example, the laser light absorbing portion 24 is a black printed portion printed with ink containing carbon black that improves laser absorption. The laser light absorbing portion 24 is provided, for example, in a region of the surface of the crystalline stretched and oriented film 21 facing the adhesive layer 22, where the non-oriented portion 21a is formed, before forming the non-oriented portion 21a.

In addition, the crystalline stretched and oriented film 21 includes a non-oriented portion 21a formed by heating the laser light absorbing portion 24 to a melting point or higher with a laser beam. The non-oriented portion 21a constitutes a portion of the breaking portion 13. As shown in FIG. The non-oriented portion 21 a is configured in various shapes depending on the configuration of the fracture portion 13 .

In the method for manufacturing the film 11C configured in this way, for example, first, ink containing carbon black or the like is printed on the region where the non-oriented portion 21a of the crystalline stretched and oriented film 21 is formed, and the laser light absorbing portion 24 is formed. Form. At this time, for example, when forming a pair of non-oriented portions 21a long in one direction and arranged in the longitudinal direction, the region of the pair of non-oriented portions 21a or the region in the width direction than the region Rectangular laser light absorbing portions 24 elongated in one direction are formed at two locations side by side in the longitudinal direction so as to form a slightly large area.

Next, the crystalline orientation film 21 and the sealant film 23 are adhered via the adhesive layer 22 . Next, the laser light output device 100 for outputting the laser light 101 is adjusted so that the crystalline stretched orientation film 21 is not heated above the melting point and the laser light absorption part 24 is heated above the melting point. adjusted to the desired output. Next, the laser light output device 100 is controlled to scan the laser light absorption section 24 .

At this time, as indicated by an arrow in FIG. 17, the laser beam 101 passes from one laser light absorbing portion 24 through the orientation portion 21b between the pair of laser light absorbing portions 24 to the other laser light absorbing portion 24. 1 scan. As a result, in the region of the laser light absorption portion 24, the crystalline stretched orientation film 21 is heated to the melting point to form the non-oriented portion 21a, and in the region where the laser light absorption portion 24 is not provided, the crystal The stretched and oriented film 21 does not melt and remains oriented. Film 11C used for package 1 is manufactured by these processes, and can be used for arbitrary packages 1 and 1A.

According to the film 11C configured in this way, the same effects as the film 11 according to the first embodiment are obtained. In addition, the film 11C is provided with the laser light absorbing portion 24 in the region where the non-oriented portion 21a is provided, so that the step of scanning the laser light 101 as shown in FIG. 17 may be performed only once.

Specifically, in order to provide the two non-orientation portions 21a, two scans are required when laser beams are respectively scanned. However, like the film 11C, by providing the laser beam absorbing portion 24 and adjusting the output of the laser beam 101 so that the crystalline stretched orientation film 21 melts only at the laser beam absorbing portion 24, two images can be obtained by one scan. It becomes possible to form the non-oriented portion 21a. Since the number of scanning times of the laser beam 101 can be reduced in this manner, the production efficiency of the film 11C can be improved, and the precision of the non-oriented portion 21a to be formed can be improved.

Moreover, the evaluation test 1 performed in the first embodiment was performed as follows on the package 1 using the film 11C. Film 11C uses a biaxially stretched polyethylene terephthalate (PET) film (Toyobo Co., Ltd.: E5100) with a thickness of 12 μm as the crystalline stretched orientation film 21, and black ink containing carbon black as the laser light absorber 24 on one side of the film. (Osaka Printing Ink Mfg. Co., Ltd.: LB-5 type) was coated so that the long side was 20 mm, the short side was 2 mm, and the short sides were opposed to each other with an interval of 1 mm to form a laser light absorbing portion. At this time, the direction parallel to the flow direction of the film was taken as the long side direction. In addition, a 40 μm thick LLDPE film (Toyobo Co., Ltd.: L4102) is used as the sealant film 23, and a urethane-based dry laminate adhesive is used as the adhesive layer 22 to provide the laser light absorption portion 24 of the crystalline stretched orientation film 21. After the sealant film 23 was attached to the surface thus formed, it was aged in a constant temperature bath at 38° C. for 3 days to produce a film 11C.

The film 11C is irradiated with a carbon dioxide laser from the short side direction central portion of one end of the laser light absorbing portion 24 of the crystalline stretched and oriented film 21 toward the short side direction central portion of the other laser light absorbing portion 24 end. Therefore, the laser light absorbing portion 24 can melt and heat the crystalline stretched and oriented film 21, but the portion not coated with the laser light absorbing portion 24 is scanned with the laser light 101 having an output that does not melt and heat. A pair of non-orientation portions 21a each having a long side of 20 mm and a short side of 1 mm were formed with a distance between adjacent portions of 1 mm. At this time, the oriented portion 21b located between the opposing short sides or between the opposing short and long sides of the non-oriented portion 21a, that is, the laser beam 101 is irradiated, but the laser light absorbing portion 24 is not coated. It was confirmed that the non-orientation portion 21a was not formed in the portion without the orientation. Using this film 11C, a pillow packaging bag having a size of 160 mm×260 mm as shown in FIG.

As a result of the evaluation test 1, the film 11C was used as the package 1 and heated in a microwave oven, so that the oriented portions 21b located between the opposing short sides or between the opposing short and long sides of the non-oriented portions 21a were formed. A steam port 21c was formed at , and steam was discharged. Moreover, the width of the steam port 21c was 2 mm. As is clear from this, it was found that the film 11C has the same effect as the film 11 does.

(Fourth embodiment)
Next, the film 11D used for the package 1, 1A according to the third embodiment of the present invention will be described with reference to FIG. Among the configurations of the film 11D according to the fourth embodiment, the configurations similar to those of the film 11 according to the first and second embodiments and the film 11C according to the third embodiment are the same. Reference numerals are attached, and detailed description thereof is omitted.

The film 11D is configured in a shape that can be used for the packages 1, 1A. As shown in FIG. 19, the film 11D includes a crystalline stretch-orientation film 21D, an adhesive layer 22, and a sealant film 23 from the outer surface side of the package 1 when the package 1 is formed. Also, for example, the film 11D includes a laser light absorbing portion 24 .

In addition, the crystalline stretched and oriented film 21D includes a non-oriented portion 21a and a continuous portion 21f that continues between the opposing short sides or between the short and long sides of the non-oriented portion 21a. The continuous portion 21f is a non-oriented portion formed by melting the crystalline stretched and oriented film 21 . The continuous portion 21f constitutes a part of the breaking portion 13. As shown in FIG. The continuous portion 21f is provided in a portion of the oriented portion 21b between the opposed short sides or between the short and long sides of the non-oriented portion 21a. That is, the continuous portion 21f has a width smaller than the width of the short side of the non-oriented portion 21a.

In the method for manufacturing the film 11D configured in this way, for example, first, ink containing carbon black or the like is printed on the region where the non-oriented portion 21a of the crystalline stretched and oriented film 21 is formed, and the laser light absorbing portion 24 is formed. Form. At this time, for example, when forming a pair of non-oriented portions 21a long in one direction and arranged in the longitudinal direction, the region of the pair of non-oriented portions 21a or the region in the width direction than the region Rectangular laser light absorbing portions 24 elongated in one direction are formed at two locations side by side in the longitudinal direction so as to form a slightly large area.

Next, the crystalline orientation film 21 and the sealant film 23 are adhered via the adhesive layer 22 . Next, the laser light output device 100 for outputting the laser light 101 is adjusted, and the laser light 101 is adjusted to an output capable of heating the crystalline stretched and oriented film 21 to the melting point or higher. Next, the laser light output device 100 is controlled to scan the laser light absorption section 24 .

At this time, the laser beam 101 is scanned from one laser light absorbing portion 24 through the alignment portion 21b between the pair of laser light absorbing portions 24 to the other laser light absorbing portion 24 in one scan. As a result, in the region of the laser light absorbing portion 24, the crystalline stretched and oriented film 21 is heated to the melting point to form a non-oriented portion 21a having a wide width in the lateral direction, and the laser light absorbing portion 24 is provided. A continuous portion 21f narrower than the non-oriented portion 21a is formed in the non-oriented region. Film 11D used for package 1 is manufactured by these processes, and can be used for packages 1, 1A, and other packages of any shape.

According to the film 11D configured in this manner, as in the film 11 according to the first embodiment, the continuous portion 21f is broken at the breaking portion 13 of the film 11 during microwave heating, and the steam port 21c is formed. be. This is because the width of the continuous portion 21f is smaller than the width of the non-oriented portion 21a when the crystalline stretched and oriented film 21 is elongated due to an increase in internal pressure inside the packages 1 and 1A during microwave heating. It is considered that the continuous portion 21f is broken first because the absolute value of the amount is smaller in the continuous portion 21f than in the non-oriented portion 21a.

The method for forming the non-oriented portion 21a and the continuous portion 21f is not limited to laser beam heating, and methods such as hot plate heating, impulse heating, and near-infrared heating can be used. , the laser light absorbing portion 24 may not be provided. For example, when hot plate heating is used, the hot plate may be formed in the shape of the non-oriented portion 21a and the continuous portion 21f. In addition, regardless of which method is used to form the non-oriented portion 21a and the continuous portion 21f, the fracture portion 13 is formed between the short sides or between the short and long sides of the non-oriented portion 21a. As long as the portion 21f is arranged, the position of the continuous portion 21f may be the center in the width direction of the short side or one end in the same width direction. In addition, even if the film 11D provided with such a continuous portion 21f is the non-oriented portion 21a having the shape of Comparative Examples 3 to 5 described above, by providing the continuous portion 21f, the continuous portion 21f can be broken to form the steam port 21c, so it has a high degree of freedom.

In addition, this invention is not limited to embodiment mentioned above. For example, in the above-described example, the package has a pillow packaging bag of the package 1 and a resin container 15 and a lid 16 of the package 1A. The shape of the package can be appropriately set as long as the space is formed and the films 11, 11C, and 11D are elongated by the increase in the internal pressure of the packages 1 and 1A. can be used. Examples of other package shapes include a three-sided seal flat pouch, a half-seal flat pouch, a gusset pouch, a standing pouch, and the like.

In the above-described example, the films 11, 11C, and 11D are configured to be used for the packages 1 and 1A. It may be a configuration. Further, in the above-described example, the structure in which one tearing portion 13 is provided in the packaging bodies 1 and 1A has been described, but the same effect can be obtained even if the film 11 is provided with a plurality of tearing portions 13 . Furthermore, in the above example, the film 11 was explained using a laminated film having a laminated structure, but the film 11 is a single-layer crystalline stretched and oriented film 21 in which the fracture portion 13 having the non-oriented portion 21a is formed. It may also be a laminated film having a multilayer structure other than the layer structure described above.

That is, the present invention is not limited to the above-described embodiments, and can be variously modified in the implementation stage without departing from the scope of the invention. Further, each embodiment may be implemented in combination as appropriate, in which case the combined effect can be obtained. Furthermore, various inventions are included in the above embodiments, and various inventions can be extracted by combinations selected from a plurality of disclosed constituent elements. For example, even if some constituent elements are deleted from all the constituent elements shown in the embodiments, if the problem can be solved and effects can be obtained, the configuration with the constituent elements deleted can be extracted as an invention.
The description equivalent to the invention described in the original claims of the present application is added below.
[1]
a film comprising a crystalline stretch-oriented film;
Disposable electrodes provided on the film, formed by heating a part of the crystalline stretched and oriented film at a melting point or higher of the crystalline stretched and oriented film, and arranged opposite to each other with the oriented portion of the crystalline stretched and oriented film interposed therebetween. a fracture portion having an orientation portion;
A package comprising a
[2]
[1], wherein at least one non-oriented portion having a short side and a long side is provided, and the short sides or the short side and the long side are arranged adjacent to each other with the oriented portion interposed therebetween. packaging.
[3]
The package according to [2], wherein the distance between the short sides of the non-oriented portion or between the short side and the long side is less than 5 mm.
[4]
The package according to [3], wherein the non-oriented portions are formed in a straight line, and a pair of the short sides are provided facing each other.
[5]
The packaging according to [2], wherein the breaking part is provided between the short sides of the non-oriented part or between the short side and the long side, and has a non-oriented continuous part narrower than the non-oriented part. body.
[6]
a crystalline stretch-oriented film;
A fractured portion having a non-oriented portion formed by heating a portion of the crystalline stretched and oriented film at a melting point or higher of the crystalline stretched and oriented film and arranged opposite to each other with the oriented portion of the crystalline stretched and oriented film interposed therebetween. When,
A film comprising
[7]
[6], wherein at least one non-oriented portion having a short side and a long side is provided, and the short sides or the short side and the long side are arranged adjacent to each other with the oriented portion interposed therebetween. film.
[8]
The film according to [7], wherein the distance between the short sides or between the short side and the long side of the non-oriented portion is less than 5 mm.
[9]
The film according to [8], wherein the non-oriented portions are formed in a straight line, and a pair of the short sides are provided facing each other.
[10]
The film according to [7], wherein the breaking part is provided between the short sides of the non-oriented part or between the short side and the long side, and has a non-oriented continuous part narrower than the non-oriented part. .

DESCRIPTION OF SYMBOLS 1, 1A... Package, 11, 11C, 11D... Film, 12... Seal part, 13... Breaking part, 15... Resin container, 16... Lid body, 21... Crystalline stretch orientation film, 21a... Non-orientation part, 21b Orientation portion 21c Vapor port 21d Outer layer removal portion 21e Outer layer cutting portion 22 Adhesive layer 23 Sealant film 24 Laser light absorption portion 51 Release agent.

Claims (9)

a film comprising a crystalline stretch-oriented film;
a broken portion provided in the film, formed by heating a part of the crystalline stretched and oriented film, and having a non-oriented portion arranged opposite to the oriented portion of the crystalline stretched and oriented film ; prepared ,
A package in which a portion of the oriented portion sandwiched between the non-oriented portions breaks when the internal pressure rises . 2. The package according to claim 1, wherein said breaking portion is formed by a plurality of said non-orientation portions facing each other with said orientation portion interposed therebetween. 3. The package according to claim 1, wherein contents to be heated in a microwave oven are accommodated. A film used for a package containing contents,
a crystalline stretch-oriented film;
A broken part provided in the crystalline stretched and oriented film, formed by heating a part of the crystalline stretched and oriented film, and having a non-oriented part arranged opposite to each other with the oriented part of the crystalline stretched and oriented film interposed therebetween. and
A film in which a portion of the oriented portion sandwiched between the non-oriented portions breaks when the internal pressure of the package increases. 5. The film according to claim 4, wherein the broken portion is formed by a plurality of the non-oriented portions facing each other with the oriented portion interposed therebetween. 6. The film of claim 4 or 5, wherein the contents are heated in a microwave oven. a film comprising a crystalline stretched and oriented film; and a film provided on the film, formed by heating a part of the crystalline stretched and oriented film, and arranged opposite to each other with the oriented portion of the crystalline stretched and oriented film interposed therebetween. a package body including a breaking portion having a non-oriented portion, wherein a portion of the oriented portion sandwiched between the non-oriented portions breaks when the internal pressure rises;
a content contained within the package;
A content-filled package comprising: 8. The content-filled package according to claim 7, wherein said breaking portion is formed by a plurality of said non-orientation portions facing each other with said orientation portion interposed therebetween. The package according to claim 7 or 8, wherein the contents are foods heated in a microwave oven.

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