JP2009161231A - Method for forming seal film - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To consistently form a seal film having a knob by using the small number of kinds of materials. <P>SOLUTION: A first base material 1 composed of a longitudinal film having a sealant layer 1b on one side, and a second base material 2 composed of a longitudinal film having a sealant layer 2b at least on one side are prepared. A part from an end of the first base material 1 is folded along a folding line 3a extending in its flow direction so that surfaces of the sealant layer 1b are opposite to each other, and a side on which a folded-back part 3 of the first base material 1 is present is superposed opposing the sealant layer 2b side of the second base material 2. The first and second base materials 1 and 2 are sealed. When punching a layered body 4 formed of the sealing into a predetermined shape, the body is punched so that the folded-back part 3 of the first base material 1 is included in a punched region 7, thus forming a knob 5 composed of mutually-sealed portions of the first base materials 1. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a method for producing a seal film used for sealing an opening of a container.

  2. Description of the Related Art Conventionally, as an inner seal for sealing an opening of a container on the inner side of a cap, it has been widely performed to provide a seal film having substantially the same diameter as the outer diameter of the opening. As a knob part when the seal film is peeled off at the time of opening, there is known one in which the outer edge part of the seal film protrudes in a circumferential shape or a tongue shape and the protruding part is a knob part.

However, when the outer edge of the seal film is a knob, if the dimension of the knob is made large for ease of gripping, the knob will move between the container and the cap when the cap is closed over the opening of the container. There is a risk that the cap may be attached poorly. For this reason, a different type member (tab liner layer) is inserted between the upper surface layer and the lower surface layer film of the seal film, and the upper surface layer and the lower surface layer are bonded together at a place where there is no different material, so There has been proposed a knob formed of layers without protruding laterally from the opening of the container (see Patent Document 1).
JP-A-6-99912

However, when the knob portion is formed by inserting different types of members, it is difficult to control the adhesive force with the upper surface layer or the lower surface layer of the seal film. If the heat amount is excessive, the amount of heat such as thermal deterioration or dimensional shrinkage of the seal film is reduced. If it is less, problems such as peeling will occur.
Moreover, the upper surface layer, the lower surface layer, the dissimilar members, and the material types are increased.

  This invention is made | formed in view of the said situation, and makes it a subject to provide the manufacturing method of the sealing film which can manufacture the sealing film which has a knob part stably with few material types.

  In order to solve the above-mentioned problems, the present invention provides a first substrate made of a long film having a sealant layer on one side and a second substrate made of a long film having a sealant layer on at least one side. And folding a part from the end of the first base so that the surface of the sealant layer faces along a fold line extending in the flow direction, and then the folded portion of the first base And the side of the second base material facing the sealant layer side of the second base material, the first base material and the second base material are sealed, and the laminate formed by the sealing step has a predetermined shape. And punching out so that the folded portion of the first base material is included in the region to be punched, and forming a knob portion composed of a portion where the first base materials are sealed. Specially To provide a method of manufacturing a seal film to.

The present invention also provides a first base material comprising a long film having a sealant layer on one side, a second base material comprising a long film having a sealant layer on at least one side, and the first base material. A step of preparing a third substrate made of a long film having a narrower width than the first and second substrates with the same configuration, and a sealant of the second substrate on the sealant layer of the first substrate The layers are opposed to each other, and after inserting the third base material between the first and second base materials, a portion where the first to third base materials are overlapped, and the first and second bases A step of sealing a region in which a portion where materials are overlapped is mixed, and an end on one side of the third base material in the region to be punched when the laminate formed by the sealing step is punched into a predetermined shape Punched out to include the part, there is a third substrate Forming a knob part made of the first base material or a knob part made up of the sealed parts of the first and third base materials. A method for producing a seal film is provided. To do.
In this sealing film manufacturing method, the third base material is preferably supplied by slitting the first base material after the first base material is fed out in the manufacturing process. .

In the present invention, it is preferable that the sealant layer of the base material is composed of the same kind of resin.
It is preferable that the surface on the opposite side of the sealant layer of the second substrate is composed of an easy peel layer.
It is preferable that the second base material includes a layer that generates heat by high frequency.

  According to the present invention, a seal film can be produced with two types of base materials. Moreover, since each sealant layer is comprised with the same kind of resin, it is easy to set sealing conditions, and stable quality can be obtained.

The present invention will be described below with reference to the drawings based on the best mode.
FIG. 1 is a view showing a first embodiment of the method for producing a seal film of the present invention, and FIG. 2 is a view showing a second embodiment of the method for producing a seal film of the present invention. 1 and 2, (a) is a cross-sectional view illustrating a base material overlapping process, (b) is a cross-sectional view showing a laminate obtained by sealing each base material, and (c) is a punching process. (D) is sectional drawing of the sealing film obtained by stamping.

  The 1st base materials 1 and 11 consist of a long film which has a sealant layer on one side, and are constituted including at least 2 layers of base material layers 1a and 11a and sealant layers 1b and 11b. A sealant layer can be comprised from 1 type (s) or 2 or more types, such as polyolefin resin, such as polyethylene (PE), a polypropylene (PP), and ethylene-vinyl acetate copolymer (EVA). Moreover, as a base material layer, the combination of single layer or multilayer which consists of polyester-type resins, such as polyethylene terephthalate (PET), polyamide-type resins, such as nylon (NY), can be used, and a stretched film is especially preferable. The first base material may include one or more layers between the base material layer and the sealant layer or on the surface of the base material layer, and further include a gas barrier layer, a printing layer, an adhesive layer, a layer for imparting functionality, and the like. Good.

  The 3rd base material 13 of the 2nd form example is the same composition as the 1st base material 11, and a long film narrower than the 1st base material 11 and the 2nd base material 12 is used. In the present invention, the third base material 13 has the same configuration as the first base material 11 means that the first base material 11 and the third base material 13 are not distinguished as material types. Means. That is, the materials, thicknesses, and combinations of the base layers 11a and 13a and the sealant layers 11b and 13b are the same.

The 2nd base materials 2 and 12 consist of a long film which has a sealant layer on at least one side. Examples of such a film include a film composed of only one sealant layer (single layer film) and a multilayer film having a sealant layer on one or both sides. The second base material may include a base material layer, and as the base material layer, a single layer or a combination of multiple layers made of a polyester resin such as polyethylene terephthalate (PET), a polyamide resin such as nylon (NY), etc. Among them, a stretched film is preferable.
The second base materials 2 and 12 may include a layer capable of generating heat by a high frequency (a high-frequency heat generation layer), and examples of the high-frequency heat generation layer include a metal foil such as an aluminum foil. In particular, the bottom surface of the second base material (the surface on the opposite side when the side sealed with the first base material is the top surface) is a surface that seals the container, and is opened when an easy-peeling material is used. Is preferable. The second substrate may further include one or more layers such as a gas barrier layer, a printing layer, an adhesive layer, and a layer imparting functionality.

  1 and 2, the second base material 2, 12 has the sealant layers 2 b, 12 b on the surface sealed against the first base material 1, 11 and the easy surface on the surface sealed against the container. The peel layers 2c and 12c represent the structure of sealant layer / base material layer / easy peel layer having the base material layers 2a and 12a therebetween. In addition, examples of the configuration of the multilayer film include various configurations such as a sealant layer / high-frequency heating layer, a sealant layer / base material layer, and a sealant layer / high-frequency heating layer / easy peel layer.

Examples of the gas barrier layer include a ceramic vapor-deposited film obtained by vapor-depositing ceramic such as alumina (Al ₂ O ₃ ) and silica (SiOx), a metal layer such as aluminum, an ethylene-vinyl alcohol copolymer (EVOH), and vinylidene chloride. Gas barrier resin layers such as By providing the gas barrier layer, it is preferable because gases such as oxygen and water vapor are prevented from passing through the film, and the storage stability of the contents is improved.

<First embodiment>
Hereinafter, with reference to FIG. 1, the 1st form example of the manufacturing method of the sealing film of this invention is demonstrated. In the manufacturing method of the seal film of this embodiment, first, a first base material 1 made of a long film having a sealant layer 1b on one side and a second film made of a long film having a sealant layer 2b on at least one side. A substrate 2 is prepared. It is preferable that the first base material 1 and the second base material 2 are both prepared in a roll shape and used by sequentially feeding them out.

  Next, as shown in the cross-sectional view of FIG. 1 (a), the surface of the sealant layer 1b faces along a fold line 3a extending in the flow direction at a part from the end of the first base material 1. After folding in such a manner, the side where the folded portion 3 of the first base material 1 exists is overlapped facing the sealant layer 2b side of the second base material 2, and the first base material 1 and the second base material 1 are overlapped. The base material 2 is sealed.

  The end of the first substrate 1 can be folded using, for example, a folding plate. At the time of folding, if only one end is folded, one chamfering of the sealing film is performed, and if both ends of the first substrate 1 are folded as shown in FIG. Chamfering is possible.

Moreover, the method of sealing a base material after a folding process includes heat sealing (heat sealing), ultrasonic sealing, high frequency sealing, and the like. Of these, heat sealing is preferred.
Further, when heat sealing is performed using a hot plate in the sealing step, the sealant layer is prevented from being welded to the hot plate or the like in order to prevent the sealant layer protruding outside the first and second base materials 1 and 2 from being welded to the hot plate. It is preferable to interpose a film that is not welded (polyethylene terephthalate (PET) film, nylon film, fluorine or silicone-treated film or sheet, etc.). If a long film is used as the film not welded to the sealant layer, as in the case of the first base material 1 and the second base material 2, they are superposed on the base materials 1 and 2 and conveyed together before the sealing means. can do.
As shown in the cross-sectional view of FIG. 1B, the laminate 4 is obtained by sealing the first and second bases 1 and 2.

  Next, as shown in FIG. 1 (c), when the laminate 4 of the first and second base materials 1 and 2 formed by the sealing process is punched into a predetermined shape, the first region is punched into the region 7 to be punched. Punching is performed so that the folded portion 3 of one base material 1 is included, thereby forming a knob portion 5 composed of a portion where the first base materials 1 are sealed. Thereby, as shown in FIG.1 (d), the seal film 6 which has the knob part 5 is obtained.

  When the opening to be sealed with the sealing film is in a cylindrical part formed so as to have an opening at the tip, the shape of punching the sealing film is approximately the same as the outer diameter of the cylindrical part, It is preferable to minimize the protrusion. Moreover, when the opening part sealed with a sealing film is opening to the flat wall surface, it is preferable to make the said punching shape into the magnitude | size which can ensure the width | variety of a seal margin on the outer side of an opening part.

  Here, when punching, the end 1s of the first substrate 1 is punched with the end 1s at the center so that it substantially corresponds to the diameter of the circular portion of the seal film 6, but the knob 5 May be offset to either one so that the area is larger or smaller than half the area of the circular portion. In addition, although the shape of punching the laminate is circular here, other shapes such as an elliptical shape, a polygonal shape such as a quadrangle and a hexagon may be used. Furthermore, after punching the seal film 6 from the laminate 4, it may be shaped by removing a part of the outer peripheral portion of the knob portion 5 or the like.

<Second embodiment>
Hereinafter, with reference to FIG. 2, the 2nd form example of the manufacturing method of the sealing film of this invention is demonstrated.
In the first embodiment described above, the knob portion 5 is formed from the folded-back portion 3 of the first substrate 1. However, in the second embodiment of the present invention, the same configuration as that of the first substrate 11 is used. The third base material 13 is prepared, and the knob portion 15A composed of the first base material 11 on the side where the third base material 13 exists, or the first base material 11 and the third base material 13 are mutually connected. By forming the knob portion 15B composed of the sealed portion, it is possible to manufacture the seal films 16A and 16B having the same functions as the seal film 6 of the first embodiment.

  In the manufacturing method of the seal film of this embodiment, first, a first base material 11 made of a long film having a sealant layer 11b on one side and a second film made of a long film having a sealant layer 12b on at least one side. A base material 12 and a third base material 13 having the same configuration as the first base material 11 and made of a long film narrower than the first and second base materials 11 and 12 are prepared. It is preferable that the first and second base materials 11 and 12 are prepared in a roll shape, and are sequentially drawn out and used.

  For the third base material 13, a necessary number of rolls are prepared according to the number of chamfers, and the third base material 13 is inserted between the first base material 11 and the second base material 12. The roll may be set on the base paper holder, or the third base material 13 is slit online with the first base material 11 fed out from the base paper holder (part of the long film is aligned along the flow direction). And cut into two or more long films).

  Next, as shown in FIG. 2A, the sealant layer 12b of the second substrate 12 is made to face the sealant layer 11b of the first substrate 11, and the first and second substrates 11 and 12 are also made. After inserting the 3rd base material 13 between, the part where the 1st-3rd base materials 11, 12, and 13 were overlapped, and the part where the 1st and 2nd base materials 11 and 12 were overlapped Seals the mixed area. The number of the third base material 13 to be inserted is not particularly limited, and if one third base material 13 is inserted, one chamfering of the sealing film is performed, and as shown in FIG. If two materials 13 are inserted, two chamfering is possible. Furthermore, if three or more third base materials 13 are inserted, it is possible to perform three or more chamfering.

Examples of the method for sealing the substrate include heat sealing (heat sealing), ultrasonic sealing, and high frequency sealing. Of these, heat sealing is preferred.
Also, when heat-sealing using a hot plate in the sealing process, a film (polyethylene terephthalate) that does not weld to the sealant layer is used to prevent the sealant layer that protrudes outside the overlapped base material from welding to the hot plate. (PET) film, nylon film, fluorine or silicone-treated film or sheet, etc.) are preferably interposed. When a long film is used as a film that is not welded to the sealant layer in the same manner as the base materials 11 to 13, these films can be transported together with the base materials 11 to 13 before the sealing means.
As shown in the cross-sectional view of FIG. 2B, a laminate 14 is obtained by sealing the first to third base materials 11 to 13.

  Next, as shown in FIG. 2C, when the laminated body 14 formed by the sealing process is punched into a predetermined shape, one end of the third base material 13 is punched into the regions 17A and 17B to be punched. 13s is included, the knob portion 15A made of the first base material 11 on the side where the third base material 13 is present, or the first and third base materials 11 and 13 sealed with each other A knob portion 15B is formed. Thereby, as shown in FIG.2 (d), seal film 16A, 16B which has knob part 15A, 15B is obtained.

In the present embodiment, when the third substrate 13 is inserted between the first and second substrates 11 and 12, the third substrate 13 of the third substrate 13 is inserted as shown on the left side of FIG. When the sealant layer 13b is opposed to the sealant layer 12b of the second base material 12 and overlapped, the seal film 16A having the knob portion 15A made of the first base material 11 on the side where the third base material 13 is present. When the sealant layer 13b of the third base material 13 is opposed to and overlapped with the sealant layer 11b of the first base material 11 as shown on the right side of FIG. 2A, the first and third bases are obtained. A seal film 16B having a knob portion 15B made of the portions 11 and 13 sealed from each other is obtained. Although FIG. 2 shows an example in which these two types of seal films 16A and 16B are manufactured together, the present invention is not particularly limited to this.
The direction in which the third base material 13 is inserted (up and down of the sealant layer 13b) may be either, and the direction of insertion can be selected according to the purpose of use. Even when the third base material 13 is prepared by slitting the first base material 11 online, the vertical direction of the sealant layer 13b of the third base material 13 is reversed halfway as necessary. Two types of seal films 16A and 16B can be selected and produced.

  When performing multiple chamfering of two or more chamfers, the sealant layers 13b of all the third base materials 13 are overlapped with the sealant layers 12b of the second base materials 12 so as to be present, and the third base material 13 is present. Only the seal film 16 </ b> A having the knob portion 15 </ b> A made of the first base material 11 on the side may be manufactured, and the sealant layers 13 b of all the third base materials 13 may be formed on the first base material 11. Only the seal film 16 </ b> B having the knob portion 15 </ b> B composed of the sealed portions of the first and third base materials 11 and 13 may be manufactured so as to face the sealant layer 11 b.

  The shape and size of punching of the laminated body 14, shaping of the knob portions 15 </ b> A and 15 </ b> B after punching can be performed in the same manner as the manufacturing of the seal film 6 by punching the laminated body 4 of the first embodiment, and thus overlap. Description is omitted.

(Seal film)
The sealing films 6, 16 </ b> A, and 16 </ b> B manufactured according to this embodiment can be used for sealing to close the opening by sealing the outer edge to the peripheral edge of the opening of the container. Moreover, this seal film can be used as an inner seal used inside the cap when the cap is attached to the cylindrical portion of the container.

  When the container is opened, the container can be easily opened by pinching the knob portions 5, 15 </ b> A, 15 </ b> B of the seal films 6, 16 </ b> A, 16 </ b> B with fingers or the like. In the case of the seal films 6, 16A, 16B manufactured according to the present invention, the knob portions 5, 15A, 15B are formed so as to protrude upward from the opening of the container, so that the knob portions 5, 15A, 15B are pinched. Cheap.

  Further, in order to manufacture a container with an inner seal using the seal film of this embodiment, in the case of using the seal films 6, 16A, 16B having a high-frequency heat generating layer on the second base material 2, 12, the container A seal film in which a knob portion is formed is disposed on the peripheral edge of the opening of the container, with the second base materials 2 and 12 facing down, and a cap is attached to the container opening, and the seal is sealed in the cap. In a state where the film is pressed against the peripheral edge of the container opening, a method of sealing between the seal film and the peripheral edge of the container opening by high-frequency induction heating can be used. Thereby, since a sealing film is positioned with respect to the peripheral part of a container opening part by the inner surface of a cap, position alignment of a sealing film is easy. In this case, at least the cylindrical portion and the cap of the container are made of an insulator such as plastic so that the high frequency reaches the high frequency heating layer inside the second base material.

  Moreover, when using the sealing films 6, 16A, and 16B which do not have a high frequency heat generating layer for the 2nd base materials 2 and 12, on the peripheral part of the opening part of a container, the sealing films 6, 16A, and 16B are used. A fourth substrate having the same shape as the punched shape and having a sealant layer on both sides and a high-frequency heat generating layer inside was placed, and a knob portion was formed on the fourth substrate. A seal film is disposed with the second base materials 2 and 12 facing down, and a cap is attached to the container opening, and the seal film and the fourth base material are placed on the peripheral edge of the container opening in the cap. A method of sealing between the seal film and the fourth base material and between the fourth base material and the peripheral edge portion of the container opening by high-frequency induction heating in the state of being pressed toward the surface can be used. Thereby, since a sealing film is positioned with respect to the peripheral part of a container opening part by the inner surface of a cap, position alignment of a sealing film is easy. In this case, at least the cylindrical portion and the cap of the container are made of an insulating material such as plastic so that the high frequency reaches the high frequency heat generating layer inside the fourth base material.

As a method for placing the seal film on the peripheral edge of the container opening, preferably a seal film with the knob portion facing downward is loaded in the cap in advance, and then the cap loaded with the seal film is placed in the container opening. The method of attaching to is mentioned.
In addition, as a method of placing the fourth base material and the seal film on the peripheral edge of the container opening, preferably, a seal film with the knob portion facing downward in the cap in advance, the fourth base material, In this order, the cap loaded with the sealing film and the fourth substrate is attached to the container opening.
As described above, according to the method in which what is to be placed on the peripheral edge of the container opening is loaded in the cap in advance and the cap is attached to the container opening, the sealing film is formed on the peripheral edge of the container opening. Or it can implement easily also in the automated machine compared with the method of attaching an empty cap after mounting a 4th base material and a sealing film.

Further, when a container with an inner seal is manufactured using the seal films 6, 16A, 16B of the present embodiment, the second base 2 and 12, when using a seal film having a high-frequency heat generating layer, the second A fifth base material that can be sealed on both sides may be interposed between the base material and the peripheral edge of the container opening, and a seal film may be placed thereon. In this case, after the seal film with the knob portion facing down and the fifth base material capable of sealing both sides are loaded in this order in the cap, the cap loaded with the seal film and the fifth base material is loaded. High-frequency induction heating can be performed in a state of being attached to the opening of the container and pressing the seal film toward the peripheral edge of the container opening in the cap.
Thus, between the seal film and the peripheral edge of the container opening (between the lower surface of the seal film and the upper surface of the fifth base, and between the lower surface of the fifth base and the peripheral edge of the container opening. ) Are mutually sealed by the heat generated inside the second substrate at a high frequency.

In the case where a seal film having no high-frequency heat generating layer is used for the second base materials 2 and 12, the second base material 2 and the peripheral edge portion of the container opening can be sealed on both sides. 5 substrate may be interposed, and the fourth substrate and the seal film may be placed thereon. In this case, a fourth base material having a seal film with the knob portion facing downward in the cap and a shape identical to the punched shape of the seal film, having a sealant layer on both sides and a high-frequency heat generating layer inside. Then, after loading the fifth base material that can be sealed on both sides in this order, a cap loaded with the fourth base material and the fifth base material on the sealing film is attached to the opening of the container. High frequency induction heating can be performed in a state where the seal film is pressed against the peripheral edge of the container opening in the cap.
Thereby, from the seal film to the peripheral edge of the container opening (between the lower surface of the seal film and the upper surface of the fourth substrate, between the lower surface of the fourth substrate and the upper surface of the fifth substrate) And between the lower surface of the fifth substrate and the peripheral edge of the container opening are sealed to each other by the heat generated inside the fourth substrate at a high frequency.

  The fifth substrate is made of a sealable member such as a thermoplastic resin, and in particular, a member having a strong seal strength between the fifth substrate and the peripheral edge of the container opening is desirable. Thereby, after pinching a knob part and peeling a sealing film, a 5th base material comes to remain in the peripheral part side of a container opening part. In such a fifth substrate, a polygonal, star-shaped, circular opening, or a large number of holes or mesh-shaped openings can be provided, whereby the flow of the contents poured out from the container Can be controlled by these openings. For example, when the contents are viscous materials such as mayonnaise, the cross-sectional shape of the contents poured out from the container is formed into a special shape such as a star by pouring the periphery of the opening into an appropriate shape. Can be issued.

  As described above, according to the sealing film manufacturing method of this embodiment, the sealing film can be manufactured using two types of base materials. Moreover, since each sealant layer is comprised with the same kind of resin, it is easy to set sealing conditions, and stable quality can be obtained.

  The seal film produced according to the present invention can be used for sealing containers, and can be applied to various contents such as foods, beverages, seasonings, and pharmaceuticals.

The 1st form example of the manufacturing method of the sealing film of this invention is shown, (a) is sectional drawing explaining the superimposition process of a base material, (b) is sectional drawing which shows the laminated body obtained by the sealing of each base material (C) is a fragmentary perspective sectional view explaining a punching process, (d) is a sectional view of a seal film obtained by punching. The 2nd form example of the manufacturing method of the sealing film of this invention is shown, (a) is sectional drawing explaining the superimposition process of a base material, (b) is sectional drawing which shows the laminated body obtained by the sealing of each base material (C) is a fragmentary perspective sectional view explaining a punching process, (d) is a sectional view of a seal film obtained by punching.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1,11 ... 1st base material, 1b, 11b ... Sealant layer, 2,12 ... 2nd base material, 2b, 12b ... Sealant layer, 2c, 12c ... Easy peel layer, 3 ... Folding part, 3a ... Folding Lines 4, 14, ... Laminate, 5, 15A, 15B ... Knob part, 6, 16A, 16B ... Seal film, 7, 17A, 17B ... Area to be punched, 13 ... Third substrate, 13b ... Sealant layer.

Claims (6)

Preparing a first substrate made of a long film having a sealant layer on one side, and a second substrate made of a long film having a sealant layer on at least one side;
A part from the end of the first base material is folded so that the surface of the sealant layer faces along a fold line extending in the flow direction, and then a folded portion of the first base material exists. Sealing the first and second substrates with the side to be faced facing the sealant layer side of the second substrate,
When the laminate formed by the sealing process is punched into a predetermined shape, the first base is sealed so that the folded portion of the first base is included in the punched region. A step of forming a knob part composed of parts;
A method for producing a seal film, comprising: A first base made of a long film having a sealant layer on one side, a second base made of a long film having a sealant layer on at least one side, and the same configuration as the first base, And preparing a third substrate made of a long film having a narrower width than the second substrate;
After the sealant layer of the second substrate is opposed to the sealant layer of the first substrate, and the third substrate is inserted between the first and second substrates, the first to first A step of sealing a region where a portion where the three base materials are overlapped and a portion where the first and second base materials are overlapped, and
When the laminated body formed by the sealing step is punched into a predetermined shape, the third base is present by punching so that one end of the third base is included in the punched region. Forming a knob portion made of the first base member on the side, or a knob portion made of the sealed portions of the first and third substrates;
A method for producing a seal film, comprising:   The seal according to claim 2, wherein the third base material is supplied by slitting the first base material after the first base material is fed out in the manufacturing process. A method for producing a film.   4. The method for producing a seal film according to claim 1, wherein all of the sealant layers of the substrate are made of the same kind of resin.   The method for producing a seal film according to any one of claims 1 to 4, wherein a surface of the second substrate opposite to the sealant layer is formed of an easy peel layer.   6. The method for producing a seal film according to claim 1, wherein the second substrate includes a layer that generates heat by high frequency.

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