JPH01124534A - Notching method and apparatus for container - Google Patents

Abstract

PURPOSE:To cheaply form notches at any arbitrary points of flanges without any forma limitation by the revolution of a container and a cutter or at least one of them by a rotary means, making the center of the container opening to be the rotary center, by regulating the relative position of the container and notches by the revolution in said manner. CONSTITUTION:A container 10 is composed of multi-layer structure at least two layers, in which an inner layer 11 inside the container is placed separably upon an outer layer 12. The container 10 is contained in a recess 31A of a container-receiver 31 and held with the container-receiver 31 by pushing forward a press member 32. The container-receiver 31 is turned at least by one revolution, pushing forward the second cutters 51, 52 and transferring a rotary means 40 to resulting forming simultaneously the first and second notches 17, 18. The notches 17, 18 can be formed at any arbitrary points of the flange 13 by adjustment of the relative position of the cutters 51, 52. These notches can be easily formed at the inner wall inside the container flange to tightly seal the whole flange plane.

Description

[Detailed Description of the Invention] [Field of Industrial Application] [The present invention is for forming a notch in a packaging container that stores contents such as food and is sealed by melt-sealing the lid with a flange. The present invention relates to a method and apparatus.

[Conventional technology]

BACKGROUND ART Conventionally, packaging materials have been known for packaging foods, etc., in which the contents are stored in a container having a flange and then sealed between the flange and a lid. In the containers used in this packaging material, when the sealing strength is increased in order to increase the adhesion, there is a problem in that the unsealability is poor. Therefore, the present applicant has developed a container that includes an inner layer portion (first layer portion) that is sealed with the lid and an outer layer portion (second layer portion) that is superposed on the inner layer portion, and the inner layer portion is connected to the outer layer portion. He proposed an invention in which the flange has a multi-layer structure that can be peeled off, a notch is formed in the inner layer of the non-sealed part of the flange, and the inner layer and outer layer are peeled off from this notch to open the package. 6
1-229591 etc.).

Incidentally, in the above-mentioned container, it is necessary to form a notch in the inner layer of the flange portion, and the following methods and apparatuses are available for this purpose.

First, in the container forming process, the receiver of the mold is a member that receives the flange of the container, and presses an annular cutting blade onto the flange to form a notch (Japanese Patent Application No. 61-2295
No. 91; Technology I).

In addition, notches are formed by pressing with a cutting blade, heating means, or a combination thereof (Japanese Patent Applications No. 61 and 22
No. 9592; Technology ■).

[Problem that the invention seeks to solve]

However, in the above-mentioned techniques I and (2), in order to form the notch, the flange of the container must be supported by a mold, etc.; It is difficult to apply this method to flanges having bent portions such as (1).Furthermore, if the thickness of the flange is not uniform, there is a problem that the notches formed in the flange will also be non-uniform. Furthermore, since the manufacturing cost of the annular cutting blade is high in technique I, there is a problem that the notch cannot be formed in the flange portion at a low cost.

SUMMARY OF THE INVENTION An object of the present invention is to provide a container notch method and a notch device therefor that do not limit the shape of the flange and can form a notch at any position on the flange at low cost.

[Means for solving problems]

The method for cutting out a container of the present invention is a method of cutting out a container having a circular mouth with a flange using a notch blade, and the method includes an inner layer portion facing the inside of the container and an outer layer portion superposed on the inner layer portion. A notch is formed in the inner layer of the container by relatively moving the container whose inner layer can be peeled off from the outer layer and the notch blade along the circumferential direction of the container mouth.

Further, the container notch device of the present invention is configured to include a holding means for holding the container, a notch blade for forming a notch in the container, and a rotation means, and the holding means has a flange formed therein and an inner part of the container. The notch blade is configured to hold a container with a circular opening including an inner layer portion facing the inner layer portion and an outer layer portion superposed on the inner layer portion, and the inner layer portion is peelable from the outer layer portion. A notch is formed in the inner layer, and the surface rotating means moves at least one of the holding means and the notch blade into the container such that the container and the notch blade move relative to each other along the circumferential direction of the container opening. It is configured to rotate around the circular center of the mouth.

[Effect]

In the present invention configured as described above, when at least one of the container held by the holding means and the notch blade is rotated by the rotating means around the circular center of the container mouth, the container and the notch blade are rotated around the circumference of the mouth. A notch is formed in the container by relative movement along the direction.

In the present invention, there is no need to provide a member for the receiver of the mold that receives the flange, so notches can be formed in flanges that have bends such as ribs and curls in addition to flat shapes. By adjusting the relative position of the notch, a notch can be formed at any position on the flange, and a relatively inexpensive notch blade can be used instead of an expensive annular notch blade, reducing the cost of notch formation. can be made lower.

〔Example〕

Embodiments of the present invention will be described below based on the drawings. Here, in each embodiment, the same or similar constituent parts are given the same reference numerals, and the explanation will be omitted or simplified.

First, the container used in the first embodiment will be explained based on FIG. 3.

The container 10 is formed into a cylindrical shape and has a circular mouth portion 1.
A flange 13 that is melt-sealed to the lid 15 over the entire circumference is formed on the 0A, and a rib 14A as a bent portion is formed on the outer peripheral edge 13A of the flange 13 toward the bottom of the container. Further, the container 10 has the container interior 10B.
The inner layer part (first N part) 11 facing the outer layer part 12 (second N part)
It has a multilayer structure including at least two layers that are polymerized in a peelable manner. These inner layer portion and outer layer portion 11.
The delamination strength of 12 is 300-2000 g/1
5 ms, preferably 400 to 1500 g/15 ms, but it is required that the sealing strength is at least smaller than that of the flange 13 and the lid 15. First and second notches 17 and 1B are formed in the inner layer portion 11 on both sides of the seal portion 16 of the flange 13, for example, on the outer peripheral edge 13A and inner peripheral edge 13B of the flange.

This notch depth is preferably formed by the time it reaches the interface between the inner layer part 11 and the outer layer part 12, but the point is that when the lid 15 is opened, the depth between the first notch 17 and the second notch 18 is It is only necessary that the inner layer part 11 can be cut and peeled off at the notch, and the container 10 can be opened.

Here, the material of the container 10 is not particularly limited, and may be polyolefin resin, polystyrene resin, polyamide resin, polyester resin, polycarbonate resin, a mixture thereof, or a thermoplastic elastomer or various additives to these. agent or inorganic filler from 5 to 70
There are resins mixed with heavy weights, metal foils, etc. Depending on the combination of layers made of these materials, materials suitable for the desired peel strength may be selected.

container, outer layer portion 12 in contact with inner layer portion 11 of container IO, and lid 15
It is preferable to use a material with excellent strength and heat resistance as the material.

The preferable material (a) of the inner layer part 11 and the preferable material (a) of the outer layer part 12 are
Examples of combinations of materials (b) include, but are not limited to, the following combinations.

(a) polyethylene resin such as high density polyethylene or low density polyethylene, (b) mixed resin of polypropylene resin and polyethylene resin, (a) mixed resin of polypropylene resin and (b) mixed resin of polypropylene resin and polyethylene resin, (a) low density Polyethylene and (b) high-density polyethylene resin, (a) ethylene-vinyl acetate copolymer and (b) mixed resin of polypropylene resin and polyethylene resin, (a) ethylene-vinyl acetate copolymer and (b) ethylene-propylene Mixed resin of random copolymer resin, (a) mixed resin of polypropylene resin or polypropylene resin and polyethylene resin, (b) mixed resin of inorganic filler-containing polypropylene resin and polyethylene resin, (a) mixed resin of polypropylene resin and polyethylene resin (b) high-density polyethylene resin containing inorganic filler, (a) homo- or random polymerized polypropylene resin, and (b)
) a high-density polyethylene resin containing an inorganic filler, and (a) an unsaturated carboxylic acid-modified polypropylene resin; and (b)
)aluminum.

The container 10 may be a two-layer structure made of the above-mentioned materials, but for the purpose of improving gas barrier properties and reducing deformation when used as a container, it may be a three-layer structure in which layers made of other materials are laminated. The layers made of other materials that may be used in the above multilayer containers include resin layers such as ethylene-vinyl alcohol copolymer, polyvinylidene chloride, nylon, and polyethylene terephthalate, and gas barrier layers such as aluminum vapor-deposited layers. There are some excellent ones. The layer made of these other materials may be only IN or may be a multilayer body consisting of two or more layers.
It may be a resin layer containing a heavy weight percentage.

The layer structure of the container 10 is appropriately selected depending on the sealant layer resin of 1E15. For example, when the lid I5 is a polyethylene sealant layer, in the above combination of resin layers, the high density polyethylene layer is added to the inner layer 11 of the container 10. It is preferable that

Note that as long as the container 10 has a feature of having a release layer inside the multilayer container, the innermost layer of the multilayer container (inner layer portion 11
) may have other layers such as a sealing layer, a heat-resistant layer, an oil-resistant layer, etc., as necessary. This container 10 is made by using the above-mentioned combination of resins to form a coextruded multilayer sheet or a laminate sheet by vacuum forming, pressure forming, etc., or by multilayer injection molding, multilayer injection blow molding, multilayer blow molding, etc. Obtainable.

Furthermore, it can also be obtained by thermoforming a multilayer film on the inside of a container such as paper.

As the lamination process, methods such as extrusion lamination, hot melt lamination, dry lamination, and wet lamination can be used. By laminating these materials using adhesives, pressure-sensitive adhesives, etc., a multilayer material having suitable glabella releasability can be obtained.

Moreover, although the 115 is a two-layer film in FIG. 3, it may be a single-layer film or a multi-layer film of three or more layers, and there is no particular limitation. When using a multilayer film, a base material made of a plastic single-layer film, multilayer film, paper, aluminum foil, or a composite material thereof, and a base material made of polyethylene, polypropylene, ethylene-α-olefin copolymer, ethylene - A sealant layer made of a resin having easy heat sealability with the innermost layer (inner layer portion 11) of the container 10 made of vinyl acetate copolymer or the like is preferably used.

Next, the device of the first embodiment for cutting out the container 10 is installed in the first embodiment.
This will be explained based on the diagram and FIG.

In FIG. 1, in which the schematic configuration is shown, the notch device 20 is
A holding means 30 for holding the container 10, a rotating means 40 for rotating the holding means 30 around the circular center of the container opening 10A, and the first and second notches 17 and 1B are formed in the container 10. First thing to do. Second notch blade a1. ,52
It consists of:

The holding means 30 has a recess 31 that accommodates the container 10.
The container receiver 31 and the pressing member 32 that press the inner circumferential surface of the container 10 housed in the container receiver 31 toward the bottom of the container are provided. Each mounted rotating shaft 33.3
It is rotatably supported via 4. Further, the pressing member 32 can move forward and backward in the axial direction, and when the pressing member 32 moves back and forth, the container 10 is carried into and out of the container receiver 31 by means not shown. At this time, an air vent hole 31B is formed at the bottom of the container holder 31, so that the container 10 can be carried in and out of the container holder 31 smoothly. Moreover, the container 10 can also be taken out by blowing out air from the air vent hole 31B.

The rotating means 40 includes a gear 41 connected to the container receiver 31 via a rotating shaft 33, and a geared motor 43 that rotates the gear 41 via a timing belt 42. is configured to be driven and paused intermittently, and when driven, a notch is formed at least at a position corresponding to the unsealed portion of the container 10 and lid 15 by rotation of the container receiver 31.

Here, the notch may not be formed all the way around, but may be formed leaving a part of the circumference.

The first notch blade 51 is arranged such that its tip can come into contact with the formation position of the first notch 17, for example, the outer peripheral edge 13A of the flange 13, while the second notch blade 52 has its tip abutted against the formation position of the first notch 17, for example, the outer peripheral edge 13A of the flange 13. The notch 18 is arranged so as to be able to come into contact with the inner circumferential edge 13B of the flange 13, for example. These notch blades 51 and 52 can be moved forward and backward by means not shown,
When moving forward, the tip reaches the inner layer 11 of the container 10, while when retreating, the tip is retracted diagonally above the container receiver 31 in FIG. 1 so as not to interfere with the loading and unloading of the container 10. ing. In addition, these notch blades 5
1 and 52 are fixed so as not to move even if they come into contact with the container 10 when they move forward, thereby ensuring that the notches 17 and 18 are formed in the container 10. Here, these notch blades 51, 52 may be heated by a heater as necessary to facilitate the formation of the notches 17, 1B, and the shape of the tip thereof may be flat, 7-shape, or U. Any material that can form a notch 17, 1, such as a letter shape or a figure 7 shape with a cutout at the tip, may be used.

Container 1 is prepared using the device according to the first embodiment having such a configuration.
The method of notching 0 will be explained based on FIG. In addition,
In FIG. 2, for convenience of explanation, illustration of the rotating means is omitted, and the container 10 is shown as a single layer.

As shown in FIG. 2 (A>), the pressing member 32 and the first
．． When the second notch blades 51 and 52 are in the retracted position, the container 10 without a notch is inserted into the recess 31 of the container receiver 31.
After storing the container in A, move the pressing member 32 forward to release the container into the container receiver 3.
1 and the container 10 is held. After that, Figure 2 (B)
As shown in 1. While advancing the second notch blades 51 and 52, as shown in (C), the rotating means 40 (see FIG. 1) is operated to rotate the container receiver 31 by a predetermined angle, for example, at least once. As a result, first and second notches 17 and 18 are simultaneously formed in the container 10 (see FIG. 1). At this time, the pressing member 32
Although the container 10 is only rotatably supported by the container holder 31, the container 10 is sufficiently held between the
It is rotated together with the container receiver 31. Furthermore, Figure 2 (D
), as shown in 1st. After retracting the second notch blades 51, 52, the pressing member 32 is retracted, and the notch 17,
The container 10 in which 1B is formed is carried out from the container receiver 31.

In addition, 1. To change the formation locations of the second notches 17 and 18, the first. The relative positions of the second notch blades 51 and 52 may be adjusted.

According to the first embodiment, the container 10 has the first and second
Since the container lO was rotated by the holding means 30 while the notch blades 51 and 52 of the The first and second notches 17 and 1B can be formed accurately regardless of the non-uniform thickness of the layer.

Furthermore, the selection of the notches 51 and 52 is not limited to the material of the inner layer 11, and the notches 51 and 52 can be formed using a high melting point, high strength resin, or even a metal such as aluminum. Furthermore, by adjusting the relative positions of the notch blades 51, 5.2, the notches 17, 1 can be placed at any location on the flange 13.
B can be formed.

In particular, the notches 17 and 18 are formed on the outer peripheral edge 13 of the flange 13.
A and the inner peripheral edge 13B, there is no need to strictly set the sealing width when melt-sealing the lid 15 on the flange 13 of the container 10, and the container 10 can be easily sealed. Furthermore, since the relatively inexpensive notch blades 51 and 52 can be used instead of the expensive annular cutting blade, the cost for forming the notch can be reduced.

"YUS" Part 1 - Next, a second embodiment of the present invention will be described based on FIGS. 4 to 6.

The second embodiment differs from the first embodiment in the structure of the container holding means and the notch blade, but the structure of the container 10 and the rotation means 40 are the same as in the first embodiment. Note that in FIGS. 4 and 5, illustration of the rotating means 40 is omitted.

In FIG. 4, which schematically shows the configuration, the holding means of the second embodiment holds the container 1 brought close to it by a lifting means (not shown).
The vacuum suction means 35 sucks the inside of 0 with negative pressure, and this vacuum suction means 35 has a substantially cylindrical body with a rich base, and a decompression system and/or high pressure air system (not shown) is connected to the axis of the vacuum suction means 35. It has a suction hole and a blowout hole 35A that communicate with the air conditioner.

Further, this vacuum suction (blowout and desorption) means 35 is connected to the rotation means 40 (see FIG. 1) so that it can be rotated while holding the container IO.

The notch blade of the second embodiment includes a rotary type first notch blade 53 that obliquely cuts off the outer peripheral edge 13A of the flange 13 to form a first notch 19 (see FIG. 6), and and a second notch blade 54 forming the first notch 18 on the periphery of the first notch blade 53.
is arranged so that it can advance and retreat, and when it advances, the first notch 1
9 reaches the inner layer 11 of the container. The second notch blade 54 is formed into a hook shape that is rotatable around the base end, and the cutting edge formed at the tip is always attached to the inner peripheral edge of the flange 13 by a spring (not shown).
3B with a predetermined biasing force, and is retracted against the biasing force of the spring when not forming a notch. If this method is adopted, the notch can be formed in the inner layer part 11 by pressing with a constant force, and the notch can be formed in the container 1.
It has a feature that even if the notch forming portion of 0 is not uniform, it can be formed to a constant depth.

A method of forming a notch in the container 10 using the notch device according to the second embodiment having such a configuration will be explained based on FIG. 5. In addition, also in FIG. 5, the container 10 is shown as a single layer for convenience of explanation.

First, as shown in FIG. 5(A), when the first and second notch blades 53 and 54 are in the retracted position, the container 10 in which notches are not formed is lifted up and down by the vacuum suction means 35 by a lifting means (not shown). After placing the container 10 near the container 10, the vacuum suction means 35 is activated to hold the container 10. After that, Fig. 5 (B)
As shown in 1. While advancing the second notch blades 53 and 54, as shown in (C), the rotating means 40 (see FIG. 1) is operated to rotate the vacuum suction means 35 through a predetermined angle, usually one rotation. As a result, the container 10 is placed in the first position. The second notches 19, 18 are formed at the same time (see FIG. 6). Furthermore, as shown in FIG. 5(D), the first
．． After retracting the second notch blades 53 and 54, the operation of the vacuum suction means 35 is stopped, and if necessary, air is blown out to remove the container 10 and collect it in a predetermined place via a lifting means (not shown).

Note that in the second embodiment as well, the first. Second notch blade 53
, 54, it is also possible to form a notch 18A shown in imaginary lines in FIG.

According to such a second embodiment, in addition to being able to achieve the same effects as the first embodiment, the following effects can also be achieved. First, since the holding means is constituted by the vacuum suction means 35, the number of parts can be reduced compared to the first embodiment. Furthermore, since the first notch blade 53 is of a low-cut type, the first notch 19 can be formed smoothly and reliably.

Next, a third embodiment of the present invention will be described based on FIG. 7.

The third embodiment incorporates the notch device 20 into a container printing device, and differs from the second embodiment in the configuration of the rotating means and the arrangement position of the notch blade, but the configurations of the holding means and the container are the same. Note that in FIG. 7, illustration of the notch blade is omitted for convenience of explanation.

The vacuum suction means 35 as the holding means of the third embodiment is rotatably attached to the tip of a rod-shaped support member 61A radially formed from the center of rotation of the container moving means 61.

The notch blades 51 to 54 of the third embodiment have the same shape as the first and second embodiments (see Fig. 1.2.4.5), and are attached to the support member 61A. . At this time, the tips of the notch blades 51 to 54 are configured to reach the inner layer portion 11, as in each of the embodiments described above.

The rotating means rotates the container 1 held by the vacuum suction means 35.
A printing roll 45 is used to print on the outer peripheral surface of the container 10, and as this printing roll 45 rotates, the container 10 is also rotated by friction with the printing roll 45. Note that the rotation of the container IO can also be performed not in the printing section but in other zones such as the drying section.

In the apparatus according to the third embodiment having such a configuration, a notch is formed in the container 10 during a normal printing process. That is, as the printing roll 45 rotates, the container 10 held by the vacuum suction means 35 is also rotated, but at this time, the container 10 is
A notch is formed in the

According to the third embodiment, in addition to being able to achieve the same effects as the second embodiment, the container 1 is removed during the printing process.
Since a zero notch can be formed, it is also possible to achieve the effect of saving labor in the container manufacturing process.

11- Next, a fourth embodiment of the present invention will be described based on FIGS. 8 and 9.

The fourth embodiment differs from each of the above embodiments in that the notch blade is moved relative to the container and in the shape of the bent portion formed on the flange of the container 10.

The flange 13 formed on the cutout container 10 in the fourth embodiment has a curling 14B as a bent portion on its outer peripheral edge 13A.

The holding means of the fourth embodiment includes a recess 36 for storing the container IO.
A, and a vacuum suction means 36 that suctions the container 1o with negative pressure.

This vacuum suction means 36 is movable forward and backward by a cylinder 37, and when it advances, it attracts the container 10 with negative pressure, and when it retreats, it releases the negative pressure so that the container 10 can be carried in and out by means not shown. It has become.

The first notch blade 55 has a cutting blade formed on the side piece of the bent tip, and forms a first notch 19 (see FIG. 9) obliquely on the outer peripheral edge 13A of the flange 13. Second
The notch blade 56 has a shape similar to that of the first embodiment and forms the second notch 18. These notch blades 55, 56 are attached to the tip of a plate member 57, and the base end of this plate member 57 is connected to the rotation means 4o of the first embodiment via the rotation shaft 34, and the rotation means 4o is connected to the rotation means 4o of the first embodiment. The first and second notches 19 are formed in the container 10 by moving the notch blades 55 and 56 along the circumferential direction of the container 10.
, 1B are formed. At this time, the plate member 57 is made elastic so that the notch blades 55 and 56 are brought into contact with the container 10 with a predetermined biasing force when the vacuum suction means 36 moves forward.

In the fourth embodiment configured in this way, after the container 1o is accommodated in the recess 36A of the vacuum suction means 36 that has been retreated, the vacuum suction means 36 is moved forward, and then the first. The second notch blades 55 and 56 are rotated by a rotating means. Then,
In the container 1o, the first. Second notch 19, 1B (see Figure 9)
will be formed. Once the notches 19 and 1B are formed, the vacuum suction means 36 is moved back and the container io is carried out.

According to the fourth embodiment, the notch 19.1B can be reliably formed even in the container 1o of the flange 13 having the curling 14B.
The more that can be formed, the less it is necessary to rotate the vacuum suction means 36, and the structure of the vacuum suction means 36 can be made simpler.

In each of the above embodiments, the lip 14A or curling 1 is attached to the outer peripheral edge 13A of the flange 13 formed on the container 1o.
4B, however, the shape of the flange 13 applied to the present invention may also be a flat shape without a lip or the like, as shown in FIG. The notches are not necessarily formed in two places, but may be formed in one place as shown in FIG. 10, or in three or more places.Furthermore, when forming the notches in two places, In addition to using two notch blades as shown in FIG.
6) and the notch blades 51 to 5 are moved together to remove the container 10.
Furthermore, a notch may be formed in the first.
The rotating means 40 in the 2.4 embodiment is composed of a gear, a timing belt, a motor, etc., and may also include a pulley, a belt, a motor, a plurality of gears, a motor, etc., as long as it rotates at least one of the holding means and the notch blade. It can be anything.

〔Effect of the invention〕

According to the present invention as described above, the shape of the flange is not limited and the notch can be formed at an arbitrary position on the flange at low cost. In particular, as shown in Fig. 9, notches can be easily formed on the inner wall of the container flange.
In addition to simply forming a notch, when sealing a lid at night and night, the entire flange plane can be tightly sealed without worrying about seal misalignment, which can greatly contribute to the packaging field.

[Brief explanation of the drawing]

FIG. 1 is a schematic configuration diagram of an apparatus according to a first embodiment of the present invention;
Figures 2 (A) to (D) are diagrams for explaining the method of the first embodiment, Figure 3 is a sectional view of the container cut out in the first embodiment, and Figure 4 is a diagram for explaining the method of the second embodiment. Such a schematic configuration diagram, FIG. 5 (A
) to (D) are diagrams for explaining the method of the second embodiment, FIG. 6 is a sectional view of the main part of the container cut out in the second embodiment, and FIG. 7 is a diagram of the apparatus according to the third embodiment. 8 is a schematic configuration diagram according to the fourth embodiment, FIG. 9 is a sectional view of the main part of the container cut out in the fourth embodiment, and FIG. 10 is a schematic diagram of the container cut out in the present invention. FIG. 7 is a sectional view of a main part showing another example. DESCRIPTION OF SYMBOLS 10... Container, 11... Inner layer part, 12... Outer layer part, 13... Flange, 14A, 14B... Rip as a bending part, curling, 15... Lid, 17.1B,
18A, 19... Notch, 20... Notch device, 30,
35°36... Holding means (vacuum adsorption means), '40.
45...Rotating means (printing roll), 51-56...
Notched blade. Figure 2 (A) (D) ○ Figure 3 Figure 4 ■ Figure 5 (A) (D) (B) (C) Figure 6 Figure 7 n Figure 8 Figure 9 Figure 10

Claims (4)

[Claims] (1) A method of cutting out a circular container with a mouth formed with a flange with a notch blade, the method comprising an inner layer portion facing the inside of the container and an outer layer portion superposed on the inner layer portion, and the inner layer portion is cut into an outer layer portion. 1. A method for cutting out a container, which comprises forming a notch in the inner layer of the container by relatively moving a container that can be peeled off from the container and a notch blade along the circumferential direction of the mouth of the container. (2) In claim 1, the outer circumferential edge of the container has a bent portion formed on the outer circumferential edge of the flange on the container bottom side, the flange inner circumferential edge, and the notch blade in the circumferential direction of the container mouth. A method for cutting out a container, characterized by relatively moving the container along the line. (3) Holding a container with a circular mouth in which a flange is formed and includes an inner layer portion facing the inside of the container and an outer layer portion superposed on the inner layer portion, and the inner layer portion is peelable from the outer layer portion. a holding means, a notch blade for forming a notch in the inner layer of the container, and at least one of the holding means and the notch blade such that the container and the notch blade move relative to each other along the circumferential direction of the container opening. and rotating means for rotating around the circular center of the container opening. (4) The container cutout device according to claim 3, wherein the holding means is a vacuum suction means for holding the container under negative pressure.