Film and bag

Abstract

To provide a film that is composed of a resin composition comprising an inorganic matter, wherein the film exhibits improved impact strength, bending pinhole resistance, and seal strength, and to provide a bag.SOLUTION: A film has one or more resin layers. At least one of the resin layers is a first resin layer comprising a polyethylene resin with a density of less than 937 kg / m3, and an inorganic matter. Based on the total film, the content of the polyethylene resin is 45 mass% or more and less than 100 mass% and the content of the inorganic matter is more than 0 mass% and 55 mass% or less.SELECTED DRAWING: Figure 3

Description

[Technical field]

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

[0002] Conventionally, fossil fuel-derived resins and the like have been used for packaging materials such as bags. In recent years, as there has been a demand to reduce the amount of plastic used in response to environmental concerns, studies have been conducted on the possibility of replacing some of these fossil fuel-derived resins with inorganic substances, thereby reducing the amount of resin used and thereby reducing carbon dioxide emissions during incineration.

[0003] For example, Patent Document 1 describes a multilayer film that can be used as a packaging material for packaging retort foods and the like, which has: (I) a density of 940 to 970 kg / m 3 High density polyethylene resin with density of 800-900kg / m 3 and an antiblocking agent; and (II) a layer having a density of 920 to 945 kg / m 3 and linear low density polyethylene with a density of 800 to 900 kg / m 3 (III) a layer made of a soft polymer having a density of 920 to 945 kg / m 3 For example, Patent Document 2 discloses a multilayer film including three layers of linear low density polyethylene having a density of 0.950 g / cm. 3 A polyolefin resin film is disclosed which contains 30 to 70% by weight of the above linear low-density polyethylene and has a shrinkage rate of 0.5% or less when treated with hot air at 100°C. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2005-193609 A [Patent Document 2] JP 2002-069213 A Summary of the Invention [Problem to be solved by the invention]

[0005] However, when producing a molded article from a film or the like using a resin composition containing an inorganic substance, the high concentration of inorganic substance may result in reduced impact strength, pinhole resistance under bending, and seal strength.

[0006] Therefore, an object of the present invention is to provide a film and a bag using a resin composition containing an inorganic substance, which can improve impact strength, pinhole resistance under bending, and seal strength. [Means for solving the problem]

[0007] [1] A film having one or more resin layers, at least one of which has a density of 937 kg / m 3 a first resin layer comprising less than 45% by mass of a polyethylene resin, and an inorganic substance, the first resin layer comprising, relative to the entire film, 45% by mass or more and less than 100% by mass of the polyethylene resin, and more than 0% by mass and 55% by mass or less of the inorganic substance. [2] The film according to [1], having two or more resin layers. [3] The film according to [2], wherein any one of the outermost layers is a second resin layer having the polyethylene resin as a main component and not containing the inorganic substance. [4] The film according to any one of [1] to [3], wherein the inorganic material is contained in an amount of 13 mass% or more relative to the entire film. [5] The film according to any one of [1] to [4], having a thickness of 10 μm or more and 150 μm or less. [6] The film according to any one of [1] to [5], wherein the melt flow rate of the polyethylene resin is 0.5 g / 10 min or more and 2.5 g / 10 min or less. [7] The film according to any one of [1] to [6], wherein the polyethylene resin is a linear low-density polyethylene. [8] The film according to any one of [1] to [7], wherein the inorganic substance is calcium carbonate. [9] The film according to any one of [1] to [8], having an impact strength of 20,000 J / m or more.

[10] The film according to any one of [1] to [9], wherein the number of pinholes occurring in the film, measured using a Gelbo flex tester at 5°C and 500 cycles, is 50 pinholes or less per A4 size sheet.

[11] A film according to any one of [1] to

[10] , which is laminated with a film made of biaxially oriented polyethylene terephthalate (PET) having a thickness of 12 μm and has a maximum seal strength of 50 N / 25 mm or more when fused at 10°C intervals in a temperature range of 130°C to 170°C.

[12] The film according to any one of [1] to

[11] , which is a sealant film.

[13] The laminate film according to any one of [1] to

[12] , further comprising a third resin layer laminated thereon, the third resin layer containing at least one of a polyolefin resin, a nylon resin, and a polyethylene terephthalate resin.

[14] A film according to any one of [1] to

[13] , which is used for a bag for retort food.

[15] A bag made of any of the films from [1] to

[14] . Effect of the Invention

[0008] According to one aspect of the present invention, it is possible to provide a film and a bag using a resin composition containing an inorganic substance, which can improve impact strength, pinhole resistance under bending, and seal strength. [Brief description of the drawings]

[0009] [Figure 1] 1 is a schematic cross-sectional view of a film according to one embodiment of the present invention. [Diagram 2] 1 is a schematic cross-sectional view of a laminated film according to one embodiment of the present invention. [Diagram 3] FIG. 2 is a schematic cross-sectional view of a laminated film according to another embodiment of the present invention. [Figure 4] 1 is a schematic diagram of a bag according to an embodiment of the present invention; DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings, etc. In this specification and the drawings, components having substantially the same functional configurations are denoted by the same reference numerals, and redundant explanations will be omitted.

[0011] [film] The film according to the present embodiment is a film having one or more resin layers, and at least one of the resin layers has a density of 937 kg / m 3 a first resin layer comprising a polyethylene resin, and an inorganic material. The film according to this embodiment may be a single-layer film consisting of only the first resin layer.

[0012] 1 is a schematic cross-sectional view of a film 1 according to this embodiment. The film 1 according to this embodiment is a single-layer film consisting of only a first resin layer. Film 1 has a density of 937 kg / m 3 Contains less than 100% polyethylene resin, and inorganic matter. The density of film 1 (first resin layer) is 937 kg / m 3 The polyethylene resin and inorganic substance have a density of 937 kg / m 3 The same applies to polyethylene resins and inorganic substances.

[0013] The film according to the present embodiment may be a laminated film having two or more resin layers. When the film has two or more resin layers, at least one of the resin layers is required to be the first resin layer, and the layers other than the first resin layer are not particularly limited. The film according to this embodiment is preferably a laminated film having two or more resin layers.

[0014] 2 is a schematic cross-sectional view of a film 40 according to this embodiment. The film 40 is a laminated film having a first resin layer 10 and a second resin layer 20. The first resin layer 10 has a density of 937 kg / m 3 The second resin layer 20 contains a polyethylene resin having a density of 937 kg / m 3 It is mainly composed of polyethylene resin and does not contain any inorganic matter. The density of the first resin layer 10 and the second resin layer 20 of the film 40 is 937 kg / m 3 The polyethylene resin and the inorganic substance in the first resin layer 10 have a density of 937 kg / m 3 The polyethylene resin is less than 100% by weight, as well as the inorganic material in the first resin layer 10,30.

[0015] The film according to the present embodiment may have one first resin layer or two or more first resin layers. When the first resin layer has two or more layers, the first resin layer may have a structure having a plurality of layers of the same composition, or may have a structure having a plurality of layers of different compositions. From the viewpoint of preventing a decrease in impact strength and seal strength due to a decrease in adhesive strength between layers, it is preferable that the plurality of first resin layers all have the same composition.

[0016] 3 is a schematic cross-sectional view of a film 50 according to this embodiment. The film 50 is a laminated film having first resin layers 10, 30 and a second resin layer 20. The first resin layers 10, 30 have a density of 937 kg / m 3 In the film 50 according to this embodiment, the first resin layer 10 and the first resin layer 30 are layers of the same composition. The second resin layer 20 has a density of 937 kg / m 3 It is mainly composed of polyethylene resin and does not contain any inorganic matter. Hereinafter, the film according to this embodiment will be described in more detail with reference to FIG.

[0017] Polyethylene resin The polyethylene resin contained in the first resin layers 10 and 30 has a density of 937 kg / m 3 The density of polyethylene resin is less than 937 kg / m 3 If it is less than this, the film 50 will have high impact strength, good bending pinhole resistance, and high seal strength. From the viewpoint of impact resistance and pinhole resistance, the density of polyethylene resin is 935 kg / m 3 It is preferable that the sintering strength is 930 kg / m or less. 3 It is more preferable that: In addition, in order to prevent inner fusion (fusion between the inner surfaces) when the bag is made, the lower limit of the density of the polyethylene resin is 903 kg / m 3 More preferably, it is greater than 908 kg / m 3 More preferably, it is 913 kg / m or more. 3 More preferably, it is equal to or greater than this. In this specification, the density can be measured by a He gas replacement method.

[0018] The lower limit of the polyethylene resin content in the entire film is 45% by mass or more. When the polyethylene resin content in the entire film is 45% by mass or more, the sheet has excellent formability. From the viewpoints of impact resistance, pinhole resistance due to bending, and seal strength, the lower limit of the polyethylene resin content in the entire film is preferably 45% by mass or more, more preferably 50% by mass or more, and even more preferably 55% by mass or more. The upper limit of the polyethylene resin content in the entire film is less than 100% by mass. From the viewpoint of reducing the amount of plastic used, the upper limit of the polyethylene resin content in the entire film is preferably 87% by mass or less, more preferably 82% by mass or less, even more preferably 77% by mass or less, even more preferably 72% by mass or less, and even more preferably 65% ​​by mass or less.

[0019] The polyethylene resin preferably has a melt flow rate (hereinafter sometimes abbreviated as "MFR") of 0.5 g / 10 min or more and 2.5 g / 10 min or less. If the MFR of the polyethylene resin is 0.5 g / 10 min or more and 2.5 g / 10 min or less, the film 1 has high impact strength, good bending pinhole resistance, and high seal strength. From the viewpoint of extrusion pressure, the lower limit of the MFR of the polyethylene resin is more preferably 0.5 g / 10 min or more, further preferably 0.6 g / 10 min or more, and further more preferably 0.7 g / 10 min or more. Furthermore, from the viewpoints of impact resistance, pinhole resistance under bending, and seal strength, the upper limit of the MFR of the polyethylene resin is more preferably 2.5 g / 10 min or less, even more preferably 2.3 g / 10 min or less, and even more preferably 2.1 g / 10 min or less. In this specification, the melt flow rate is a value measured at 190° C. under a load of 2160 g in accordance with JIS K7210:1999.

[0020] Examples of the polyethylene resin include linear low density polyethylene resin (LLDPE) and low density polyethylene (LDPE). From the viewpoints of impact resistance, pinhole resistance upon bending, and seal strength, the polyethylene resin contained in the film 1 is preferably linear low-density polyethylene. From the viewpoint of reducing the environmental load, at least a part of the polyethylene resin may be a plant-derived resin. In this case, the density of the plant-derived resin is also 937 kg / m 3 is less than.

[0021] ·Inorganic matter Examples of the inorganic substances contained in the first resin layers 10 and 30 include calcium carbonate, talc, silica, carbon, and titanium oxide. The first resin layers 10, 30 may contain one type of such inorganic material, or may contain two or more types.

[0022] From the viewpoint of cost, the first resin layers 10, 30 preferably contain calcium carbonate as an inorganic substance.

[0023] The lower limit of the content of inorganic substances in the entire film is more than 0% by mass. By including inorganic substances in the film, the amount of plastic used can be reduced, and the environmental impact can be reduced. From the viewpoint of reducing the amount of plastic used, the lower limit of the inorganic content in the entire film is preferably 13% by mass or more, more preferably 18% by mass or more, even more preferably 23% by mass or more, even more preferably 28% by mass or more, and even more preferably 35% by mass or more. Furthermore, the upper limit of the inorganic content in the entire film is 55% by mass If the inorganic content exceeds 55% by mass, the seal strength of the film 50 may be weakened. From the viewpoint of improving the seal strength, the upper limit of the content of inorganic substances in the entire film is preferably 55% by mass or less, more preferably 50% by mass or less, and even more preferably 45% by mass or less.

[0024] The first resin layers 10 and 30 may contain only the polyethylene resin and inorganic substance described above. Alternatively, the first resin layers 10 and 30 may contain components other than the polyethylene resin and inorganic substance described above, as long as the effects of the present invention are not lost. For example, the first resin layers 10, 30 may contain a plant-derived resin. In this case, as described above, at least a part of the polyethylene resin may be a plant-derived resin. For example, the first resin layers 10 and 30 may contain additives. Examples of the additives include an antiblocking agent, a slip agent, an anti-dye agent, an antioxidant, a neutralizing agent, an antistatic agent, and a pigment.

[0025] The second resin layer 20 is a layer containing the above-mentioned polyethylene resin as a main component and not containing the above-mentioned inorganic matter. If the film 50 has such a second resin layer 20 as one of the outermost layers, the material strength will not be reduced and the seal strength will not be lowered. In addition, since such a second resin layer 20 is suitable as a layer that comes into contact with contents such as food, the film 50 is also suitable for food applications. In this specification, the term "main component" refers to the component that is contained in the largest proportion among the components that constitute the second resin layer 20.

[0026] The film according to this embodiment, whether it is a single-layer film or a laminate film, preferably has a thickness of 10 μm or more and 150 μm or less. A film 1 of such a thickness is particularly suitable for use in retort foods. From the viewpoint of impact resistance and seal strength, the lower limit of the thickness of the film according to this embodiment is more preferably 10 μm or more, even more preferably 30 μm or more, and even more preferably 40 μm or more. From the viewpoint of reducing the amount of plastic used, the upper limit of the thickness of the film according to this embodiment is more preferably 150 μm or less, even more preferably 100 μm or less, and even more preferably 80 μm or less.

[0027] From the viewpoint of improving impact resistance, the film according to this embodiment preferably has an impact strength of 20,000 J / m or more, more preferably 25,000 J / m or more, and even more preferably 30,000 J / m or more. The impact strength in this specification can be measured in accordance with the examples described later.

[0028] From the viewpoint of improving pinhole resistance to bending, the film according to the present embodiment preferably has a pinhole count of 50 or less per A4 size, measured at 5° C. and 500 times using a Gelbo flex tester. The pinhole count is more preferably 35 or less per A4 size, even more preferably 25 or less per A4 size, even more preferably 15 or less per A4 size, and particularly preferably 10 or less per A4 size. In this specification, the number of pinholes generated is a value measured after the film according to this embodiment is produced.

[0029] The film according to the present embodiment is laminated with a 12 μm thick film made of biaxially oriented polyethylene terephthalate (PET) and fused at 5° C. intervals in a temperature range of 130° C. to 170° C., and the maximum seal strength is preferably 50 N / 25 mm or more, more preferably 55 N / 25 mm or more, and even more preferably 60 N / 25 mm or more. There is no particular upper limit, but it is, for example, 200 N / 25 mm or less.

[0030] The film 1 preferably has a tensile property in MD (Machine Direction) such that the breaking strength is 23 MPa or more, more preferably 26 MPa or more, and even more preferably 29 MPa or more, and more preferably 80 MPa or less. The film 1 preferably has a TD (transverse direction) tensile strength of 19 MPa or more, more preferably 22 MPa or more, and even more preferably 25 MPa or more, and more preferably has a TD tensile strength of 70 MPa or less.

[0031] The tensile properties (breaking strength) of the film can be measured in accordance with JIS Z1702.

[0032] [Film manufacturing method] The method for producing the film according to this embodiment is not particularly limited. For example, examples of a method for producing film 1, which is a single-layer film, include a method in which a resin composition for film is prepared from raw materials containing the above-mentioned polyethylene resin and inorganic substances as desired, and this resin composition is then subjected to inflation molding, extrusion molding, or cast molding. Further, for example, methods for manufacturing films 40 and 50, which are laminated films, include, for example, a method of inflation molding or co-extrusion of the materials of each layer, a method of extruding the materials of one layer onto one side of a previously manufactured layer and laminating them, a method of previously manufacturing films corresponding to each layer and laminating the films by bonding them together, and a method of coating one side of a previously manufactured layer with a coating liquid containing the materials of the other layer.

[0033] The film according to this embodiment may be used as, for example, a sealant film. The film according to the present embodiment can be used as a packaging material. An example of the packaging material is a bag. Such a bag can be used as a packaging material for retort food. As an example, a bag made of the laminated film according to this embodiment will be described below.

[0034] [Bag body] FIG. 4 shows a schematic diagram of a bag 100 made of a film according to this embodiment. The bag 100 includes a bag body 110 having a first surface 111 and a second surface 112 opposed to each other. The bag body 110 is formed using the film 50 according to this embodiment. In this embodiment, the two films 50 are joined to each other at the side seal portions 121, 122 and the bottom seal portion 130 by heat sealing or the like to form the bag body 110 having a first surface 111 and a second surface 112. The bag body 100 may be formed, for example, by folding back one piece of the film 50 according to this embodiment. The bag body 110 of the bag body 100 preferably has the second resin layer 20 on its inner surface (the side of the contents).

[0035] After the contents are filled into the bag 100 through the opening 140, the first surface 111 and the second surface 112 of the opening 140 may be joined together by heat sealing or the like. Also, for example, the bag body 100 may be formed with a zipper tape at the opening 140 to form a packaging bag with a zipper tape.

[0036] The film according to the present embodiment can improve impact strength, pinhole resistance, and seal strength while reducing the amount of plastic used by adding inorganic substances. The film according to the present embodiment is particularly useful as a film that can be used for boiling sterilization, such as for retort food applications.

[0037] [Modifications] The present invention is not limited to the above embodiment. For example, in the film 50, the first resin layer 10 and the first resin layer 30 are layers having the same composition, but the first resin layer 10 and the first resin layer 30 may be layers having different compositions. For example, the film according to an embodiment of the present invention may have three or more first resin layers.

[0038] For example, the film according to one embodiment of the present invention may further include a third resin layer laminated thereon. Examples of the third resin layer include polyolefin resin, nylon resin, and polyethylene terephthalate resin. Examples of polyolefin resins that can be used include polypropylene resins such as homopolypropylene (HPP), random polypropylene (RPP), and block polypropylene (BPP); polyethylene resins such as high-density polyethylene (HDPE) and (linear) low-density polyethylene (LDPE); and linear ethylene-α-olefin copolymers. As the nylon resin, nylon 6, nylon 8, nylon 11, nylon 12, nylon 6,6, nylon 6,10, nylon 6,12, etc. can be used. In addition, various additives such as a colorant can be appropriately added to the third resin layer. The third resin layer is preferably a layer containing at least one of a nylon resin and a polyethylene terephthalate resin. When used for retort applications, it is preferable to laminate a layer containing a polyethylene terephthalate resin, a layer containing a nylon resin, and a film according to one embodiment of the present invention in this order, and it is more preferable to further include a barrier film such as an aluminum foil or a vapor-deposited film between at least any of the layers. EXAMPLES

[0039] EXAMPLES Hereinafter, examples of the present invention will be described, but the present invention is not limited to these examples.

[0040] [Film Production] [Examples 1 to 4, Comparative Examples 1 to 2, Reference Examples 1 to 2] A laminated film having a thickness of 45 μm was produced by inflation molding. The raw materials of the films in each of the Examples, Comparative Examples, and Reference Examples were as follows. The blending amounts (contents) of each raw material were as shown in Tables 1 and 2. For the intermediate layer and the second outermost layer in Examples 1 to 4, and the intermediate layer and the second outermost layer in Comparative Examples 1 and 2, the raw materials were blended in advance to produce resin compositions, and the resin compositions were used for inflation molding. The density and MFR of each polyethylene resin were measured by the above-mentioned methods.

[0041] Polyethylene resin A: Density = 915 kg / m 3 , MFR=1.0g / 10min Polyethylene resin B: Density = 937 kg / m 3 , MFR=1.8g / 10min Polyethylene resin C: Density = 913 kg / m 3 , MFR=3.8g / 10min Polyethylene resin D: Density = 926 kg / m 3 , MFR=0.8g / 10min Calcium carbonate: Product name PEX10560AL, manufactured by Tokyo Ink Co., Ltd.

[0042] [Film Evaluation] <Breaking strength (MPa)> A dumbbell-shaped test sample according to JIS regulations was prepared from each film, and the breaking strength (MPa) was measured. The breaking strength (MPa) of the film was measured based on JIS Z 1702:1994 by conducting a tensile test on the test sample at 500 mm / min using a tensile tester (product name: AGS-X) manufactured by Shimadzu Corporation. The results are shown in Tables 1 and 2.

[0043] <Impact strength (J / m)> Each film was cut into a square test sample measuring 10 cm x 10 cm. A film impact tester manufactured by Toyo Seiki Co., Ltd. was used to strike a semispherical pendulum (diameter 1.0 inch) against a fixed circular test sample, and the impact strength (J / m) required to punch the test sample was measured (30 kg cm scale). The results are shown in Tables 1 and 2.

[0044] <Bending pinhole resistance (pieces / A4)> Each film was cut to a size of 21.0 cm (14.3 inches) x 29.7 cm (11.7 inches) to prepare a rectangular test film. This test film was then wound up into a cylindrical shape with a length of 21.0 cm (14.3 inches). One end of the cylindrical film was then fixed to the outer periphery of the disk-shaped fixed head of a Gelbo Flex Tester (manufactured by Rigaku Kogyo Co., Ltd.), and the other end of the cylindrical film was fixed to the outer periphery of the disk-shaped movable head of the tester, which was opposed to the fixed head and separated by 17.8 cm (7.0 inches). The movable head was then rotated 440° while approaching the fixed head along the axes of both heads facing each other in parallel by 8.8 cm (3.5 inches), and then moved straight for 6.4 cm (2.5 inches) without rotating, and then these movements were carried out in the opposite direction to return the movable head to its original position. This bending test cycle was continuously repeated at a speed of 40 cycles per minute. The bending test was carried out at 5°C for a total of 500 cycles after the test film was prepared. The number of pinholes (A4 size: 528.7 cm) that appeared in the area of ​​17.8 cm (7.0 inches) x 29.7 cm (11.7 inches) of the tested film, excluding the area fixed to the outer circumference of the fixed head and the movable head, was counted. 2 The number of pinholes per square inch (81.9 square inches) was measured. The results are shown in Tables 1 and 2.

[0045] <Seal strength (N / 25mm)> Each film was cut to a size of 50 mm x 300 mm, and a rectangular test film was prepared by joining the inner faces of the film together. Each test film was sealed at a pressure of 0.2 MPa and a sealing time of 1.0 second, and after heat sealing, it was left to stand for 24 hours, and then the seal strength was measured using a tensile tester (product name: AGS-X) manufactured by Shimadzu Corporation in accordance with the T-peel test method of JIS K6854-3:1999. The seal strength was measured by T-peeling the test pieces of each example at a tensile speed of 200 mm / min in MD. The results are shown in Tables 1 and 2.

[0046] [Table 1]

[0047] [Table 2]

[0048] As is clear from Tables 1 and 2, the films of Examples 1 to 4 had impact strength, pinhole resistance, and seal strength equivalent to or greater than those of Reference Examples 1 and 2, which did not contain an inorganic substance. In addition, the films of Examples 1 to 4 had a polyethylene resin density of 937 kg / m 3 Compared with the films of Comparative Examples 1 and 2, the impact strength, pinhole resistance upon bending, and seal strength were improved. [Explanation of symbols]

[0049] 1,40,50...film, 10,30...first resin layer, 20...second resin layer, 100...bag body, 110...bag main body, 111...first surface, 112...second surface, 121,122...side seal portion, 130...bottom seal portion, 140...opening.

Claims

1. A film having one or more resin layers, At least one of the resin layers has a density of 937 kg / m ３ a first resin layer comprising a polyethylene resin of less than 1000 ppm, and an inorganic material; The film contains 45% by mass or more and less than 100% by mass of the polyethylene resin and more than 0% by mass and 55% by mass or less of the inorganic material, based on the entire film.

2. The film according to claim 1 , which has two or more resin layers.

3. The film according to claim 2 , wherein any one of the outermost layers is a second resin layer containing the polyethylene resin as a main component and not containing the inorganic substance.

4. The film according to claim 1 , wherein the inorganic material is contained in an amount of 13% by mass or more based on the entire film.

5. 2. The film of claim 1, having a thickness of 10 μm or more and 150 μm or less.

6. The film according to claim 1, wherein the polyethylene resin has a melt flow rate of 0.5 g / 10 min or more and 2.5 g / 10 min or less.

7. 2. The film of claim 1, wherein the polyethylene resin is a linear low density polyethylene.

8. The film of claim 1 , wherein the inorganic material is calcium carbonate.

9. 2. The film of claim 1, having an impact strength of 20,000 J / m or more.

10. 2. The film according to claim 1, wherein the number of pinholes generated in the film is 50 or less per A4 sheet when measured at 5°C and 500 times using a Gelbo flex tester.

11. 2. The film according to claim 1, wherein the maximum seal strength when laminated with a 12 μm thick film made of biaxially oriented polyethylene terephthalate (PET) and fused at 10° C. intervals in a temperature range of 130° C. to 170° C. is 50 N / 25 mm or more.

12. The film of claim 1 which is a sealant film.

13. 2. The film according to claim 1, further comprising a third resin layer laminated thereon, the third resin layer containing at least one of a polyolefin resin, a nylon resin, and a polyethylene terephthalate resin.

14. The film according to claim 1, which is used for a pouch for retort food.

15. A bag made of the film of any one of claims 1 to 14.

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