JP5838045B2 - Sealing member welding method and container - Google Patents

Description

  In the present invention, a sealing member that can be used for a packaging material for foods and industrial chemicals such as liquids, viscous materials, powders, and granular materials and secondary batteries such as lithium ion batteries and nickel metal hydride batteries is welded. Related to the container.

In recent years, containers in which sealing members are welded are used in various foods and industrial chemicals. For example, it is a common practice to fill and squeeze a cylindrical cartridge or laminate tube with a fluid material such as an adhesive or a sealing material.
In Patent Document 1, an intermediate barrel formed into a cylindrical shape with a plastic laminate film, a bottom integrally joined to the lower inner surface of the intermediate barrel by insert injection molding means, and an outer upper end of the intermediate barrel are formed. There has been proposed a plastic container having an annular portion integrally joined by insert injection molding means and an upper lid having a mouth portion joined to an upper end surface of the annular portion.
However, the molding method using insert injection requires an expensive injection molding device, a large mold is required because the intermediate barrel is set in the mold, and the size of the mold is small. There are problems such as low productivity and low productivity, and even if containers with the same diameter have different capacities (lengths), different molds are required. The burden on the equipment was heavy and not practical.

In order to improve this point, Patent Document 2 includes a step of manufacturing a cylindrical member by rolling a soft film, and a bottom plate member harder than the soft film is fitted inside the first end portion of the cylindrical member. And a step of fitting a ring member harder than the soft film into the second end portion of the cylindrical member to weld it in an airtight manner. Container manufacturing methods have been proposed.
And (1) a method of making a cylindrical member by rounding a soft film in advance, and then inserting and welding a bottom plate member or a ring member, and (2) mandrel fixing the bottom plate member, the flexible film, and the ring member Two manufacturing methods are described in which the outer peripheral surface of the bottom plate member and the ring member and the soft film are welded together, and both side portions in the length direction of the soft film are welded together.
However, the manufacturing method (1) needs to precisely control the inner diameter of the cylindrical member and the outer shape of the bottom plate member and the ring member. Otherwise, slack may occur during welding, or the bottom plate member or the ring member may not be fitted into the tip of the cylindrical member. In consideration of this point, the manufacturing method (2) uses a receiving member that can be raised and lowered with respect to the mandrel in order to protrude the receiving member and receive the soft film from the back when welding the overlapping portions of the soft films. It is necessary to provide it, and the manufacturing equipment becomes complicated.

Further, Patent Document 3 discloses a radial force that abuts the end of the sealing member on the inner surface of the cylindrical film without using a mandrel or a receiving member when welding the cylindrical film and the sealing member. A method of manufacturing a container in which a tubular film and a sealing member are welded by applying a tensile force or a pressing force to the sealing member in a direction perpendicular to the surface of the sealing member. Proposed.
However, this manufacturing method has a problem that the sealing member is limited to a dome-like (concave or convex) shape and flexible.

And the metal container is used for the exterior container which accommodates batteries, such as a lithium ion secondary battery used for various electronic devices or an electric vehicle. However, the metal container is heavy, bulky, complicated in the packaging process, and lacks productivity. Moreover, since many lithium batteries for electric vehicles are mounted on the vehicle, it is desired that the container be light and compact.
In order to improve this point, as shown in FIG. 6, thin and light weight is achieved by using a flat bag made of a laminate L in which a metal foil such as an aluminum foil and a resin film are laminated or a drawn container P. . However, when the aluminum laminate packaging material is also used as a battery outer case, the mechanical strength may be insufficient. In addition, there is a problem of moisture intrusion from the heat seal part H and volatilization of the electrolyte.

JP 2001-278292 A JP 2002-104448 A Special table 2007-537067 gazette

  The present invention has been made in view of the above background, has high productivity, simple manufacturing equipment, and a method for welding a sealing member to a tubular film having a high degree of freedom of the sealing member to be used, and Productivity is high, manufacturing equipment is simple, the degree of freedom of the sealing member to be used is high, mechanical strength is high, light and compact, moisture intrusion from the welded part between the tubular film and the sealing member It is an object of the present invention to provide a container having a small risk of liquid dispersion from contents.

  In order to solve the above problems, the inventor of the present invention, as a result of investigating welding the sealing member to the cylindrical film with high sealing strength, as a result, the sealing member is disposed at the welded portion of the cylindrical film, It is optimal to press the tubular film against the dent with the protruding seal member corresponding to the groove-shaped dent from the outside of the tubular film, stretch the tubular film with the dent, adhere to the sealing member and weld I got the knowledge. And based on this knowledge, the present invention was made by using the sealing member having a recess for accommodating a part of the tubular film on the welding surface, and obtaining the idea of stretching and welding the tubular film in this recess. is there.

That is, the present invention provides the following sealing member welding method.
(1) In the method of welding a sealing member in a container having at least an inner surface having a weldability and a total of two sealing members that seal both ends of the tubular film, the tubular shape one end of the film, by inserting the first sealing member having a welding surface of the groove-like recess for accommodating a portion of the tubular film, placed welding point of the tubular film, the tubular film sealing of a sealing member of the ridges corresponding to the groove-like recess from the outside, pressing the tubular film in the groove-like recess, said stretching the tubular film in groove-shaped recess the first by welding the member and hermetically sealed to one end of the tubular film, the other end of the tubular film, the second having a groove-like recess welding surface for accommodating a portion of the tubular film The sealing member has few groove-like dents. Both were welded to the tubular film leaving a part, and after filling the contents from the groove-shaped recess, the groove-shaped recess was hermetically welded to the tubular film, and the contents were stored. welding method of the sealing member, characterized in that that make up the package.
(2) and the tubular film, between the groove-like recess than the welding surface of the sealing member, in the presence of a gap, placing the sealing member to the welding point of the tubular film ( 1) A sealing member welding method.
(3) in the groove-like recess, the strain at which the tubular film is stretched is smaller than the strain at which the tubular film is subjected to a load of the upper yield stress or 0.2% proof stress (1) Or the welding method of the sealing member of (2) .

Moreover, this invention provides the following containers.
(4) a tubular film whose inner surface has a weldability even without low, anda total of two sealing members for sealing the ends of the tubular film, to one end of the tubular film, wherein The tubular film in which a first sealing member having a groove-like recess for accommodating a part of the tubular film on the welding surface is hermetically welded and welded to the first sealing member by the groove-like recess. A groove- shaped recess is formed on the other end of the tubular film, and a second sealing member having a groove-shaped recess for accommodating a part of the tubular film on the welding surface is provided at the other end of the tubular film. A container characterized by having a gap that is welded to the tubular film leaving at least a portion thereof and that is filled with contents from the groove-like recess .
(5) a cylindrical film having at least an inner surface weldable, and a total of two sealing members for sealing both ends of the cylindrical film, and the cylindrical film is formed at one end of the cylindrical film. A first sealing member having a groove-like recess for accommodating a part of the film on the welding surface is hermetically welded, and a groove is formed in the cylindrical film welded to the first sealing member by the groove-like recess. A second sealing member having a groove-like recess for accommodating a part of the cylindrical film on the welding surface is hermetically welded to the other end of the cylindrical film. A groove-shaped recess is formed in the tubular film welded to the second sealing member by the recess, and the groove-shaped recess of the first sealing member is formed at both ends of the tubular film , It said groove-like recess and is opposed to the second sealing member, the tube in which the sealing member does not exist Film said groove-like recess in the intermediate portion is formed of, wherein one end that formed by a groove-like recess which continues to the other end from the tubular film container.
(6) The container according to (4) or (5), wherein the sealing member includes a side wall at a peripheral edge, and the tubular film is welded to an outer surface of the side wall.
(7) any of the container to at least one of said first sealing member and said second sealing member is annular (4) to (6).
( 8 ) The container according to any one of ( 4 ) to ( 7 ), wherein the cylindrical film and the sealing member are a laminate including a gas barrier layer.

According to the welding method of (1), without using a special device, the tubular film is stretched by the protruding seal member corresponding to the groove shape of the recess along the recess welding surface of the sealing member. It can be welded in close contact with the entire circumference of the welding surface of the sealing member including the recess.
As a result, even if the tubular film is slack with respect to the sealing member, the slack is absorbed by the recess of the sealing member, so that the production facility is simple and highly productive without generating wrinkles. There is provided a method for welding a sealing member to a tubular film having a high degree of freedom of the sealing member to be used.
In addition, after sealing one end of the tubular film, welding the second sealing member to the other end, leaving at least a part of the recess of the sealing member, and filling the contents from the recess, Since the dent is hermetically welded to the tubular film to form the package, a package in which the contents are stored can be easily formed without providing a filling port.

According to the welding method of (2), since the sealing member is intentionally slackened and the sealing member is disposed at the welding position of the cylindrical film, the sealing member can be smoothly inserted into the cylindrical film. In addition, the arrangement of the sealing member is extremely easy as compared with the case where a special device such as a mandrel is used. Then, the loosened cylindrical film can be tightly adhered to the recess and hermetically welded by being pushed into the welding surface of the recess of the sealing member by a protruding seal member corresponding to the shape of the recess and extended.
This provides a method for welding a sealing member to a tubular film with higher productivity and simpler manufacturing equipment.

According to the welding method of ( 3 ), since the tubular film can be elastically deformed without substantially generating permanent strain, the extended tubular film can be surely applied to the sealing member with a force to shrink. It can weld in the state which stuck the cylindrical film.

According to the container of ( 4 ), the second sealing member is welded to the tubular film leaving at least a part of the groove-shaped recess, and has a gap for filling the contents from the groove-shaped recess. Therefore, it is possible to easily form a package body in which contents are stored without providing a filling port.

According to the container of (5), since it becomes a cylindrical container in which the groove-shaped recessed part continuous from one end to the other end of the cylindrical film is formed, the self-supporting property is improved and the rigidity of the container is increased. Moreover, since wrinkles do not enter the cylindrical film near the sealing member, the appearance is also improved.

According to the container of (6), since the outer wall of the side wall of the sealing member and the tubular film can be welded, a wide welding surface can be obtained even if the sealing member is thin and light.
Thereby, welding intensity | strength is high and the water penetration | invasion from a welding part and the water dispersion | distribution loss of the contents can be suppressed.

According to the container of ( 7 ), since the sealing member is annular, another member having various functions such as a filling port and a spout can be provided on the sealing member by fitting or screwing.
Thereby, the container applicable to various uses is obtained.

According to the container of ( 8 ), since the cylindrical film and the sealing member include the gas blocking layer, gases such as water vapor and oxygen can be blocked. In particular, in the present invention, even if the tubular film is a laminate that includes a metal foil as a gas barrier layer and is not easily stretched, a container can be obtained in which the tubular film is securely adhered and welded to the sealing member.
Thereby, even if the cylindrical film is a laminate that includes a metal foil and is not easily stretched, high productivity can be obtained with a simple manufacturing facility, and a container free from wrinkles and slack can be obtained.

It is a perspective view which shows an example of the container of this invention. It is explanatory drawing which shows a mode that a cover is mounted | worn with the container of this invention of FIG. It is sectional drawing of the container of this invention of FIG. It is a perspective view which shows an example applied to the battery exterior by another example of the container of this invention. It is a perspective view of the sealing member welded to the container of this invention of FIG. It is a perspective view of the battery exterior using the conventional draw-formed container.

Hereinafter, the present invention will be described in detail based on embodiments.
FIG. 1 is a perspective view of a container of the present invention in which a flat sealing member is welded to one end and an annular sealing member is welded to the other end, and a pouring inlet is attached to the annular sealing member to form a lid. is there.
FIG. 2 is an explanatory view showing a state in which the first sealing member as a lid is attached to the container shown in FIG.
FIG. 3 is a cross-sectional view of the container shown in FIG.
1 to 3, reference numeral 1 is a container of the present invention, reference numeral 2 is a tubular film, reference numeral 21 is a recess provided in the tubular film 2, reference numeral 3 is a first sealing member as a lid, reference numeral 31. Is a welding surface of the first sealing member 3, reference numeral 32 is a recess provided in the first sealing member 3, reference numeral 33 is a pouring inlet provided in the first sealing member 3, and reference numeral 4 is a bottom member. As a second sealing member, reference numeral 41 denotes a welding surface of the second sealing member 4, and reference numeral 42 denotes a dent provided in the second sealing member 4.

  The cylindrical film 2 used for the container of the present invention needs to have weldability at least on the inner surface. Therefore, it may be a single-layer or multi-layer tube by an inflation method. However, various types of tubes may be formed by rolling a flexible base material such as a laminate film into a cylindrical shape and welding both ends. It is preferable because it can provide various functions. The tubular film 2 is preferably tough, and it is preferable to use a laminate film in which a biaxially stretched film such as a polyester resin such as polyethylene terephthalate (PET) having high strength or a polyamide resin such as nylon is laminated. it can. In order to give the container a waist, paper may be laminated on the tubular film 2. A plurality of biaxially stretched films may be laminated to increase the strength.

  The laminate film to be the cylindrical film 2 needs to have weldability on at least one side. For example, a laminate film in which a sealant layer is laminated on the surface of a base material layer made of a biaxially stretched film or the like can be used. When the sealant layer is thick and has sufficient strength, the sealant layer alone may be used. Examples of the resin constituting the sealant layer include a polyolefin having weldability such as polyethylene (PE) and polypropylene (PP).

  The cylindrical film 2 was vapor-deposited with a ceramic such as a polyvinylidene chloride layer, an ethylene-vinyl alcohol copolymer layer, a metal foil, a metal vapor deposition layer, or a metal oxide in order to provide gas barrier properties such as oxygen and water vapor. A gas barrier layer such as a ceramic deposition layer can be provided. As the metal used for the metal foil or the metal vapor deposition layer, for example, aluminum can be used. Examples of the ceramic include alumina (aluminum oxide) and silica (silicon oxide). Moreover, you may have a printing layer and a colored layer for decoration.

In particular, in the present invention, even if the tubular film is a laminate that includes a metal foil as a gas barrier layer and is not easily stretched, a container can be obtained in which the tubular film is securely adhered and welded to the sealing member.
The thickness of the tubular film 2 is not particularly limited, and an appropriate thickness may be selected according to the size and rigidity of the container. Usually, about 30 μm to 5 mm is employed.
When laminating these various layers, dry lamination using an adhesive, extrusion lamination by extruding the molten resin directly or via an anchor agent layer, film sand lamination for bonding with the molten resin layer of the extrusion laminate, or heating and pressing It is possible to use a heat laminate or the like that is pressed.

  When the flexible base material used as the cylindrical film 2 has a sealant layer only on one side, the sealant layer is placed inside and the both ends are stacked and welded, so that a joint seal is obtained. Moreover, when a flexible base material has a sealant layer on both surfaces, it can also be used as a palm seal, but it can be used as an envelope sticker by overlapping both ends and welding the overlapping portions. In the case of an envelope sticker, the appearance is good because the joint is not noticeable, but a core such as a mandrel needs to be used as a receiving member. In addition, when the flexible substrate includes a metal layer, the cross section of the flexible substrate is exposed on the inner surface and the outer surface of the tubular film 2. Depending on the contents, the cross section may be covered with a resin layer. End face processing may be required.

  Sealing members 3 and 4 are inserted into the tubular film 2 and welded to the tubular film 2 on the peripheral surface thereof to become a container lid or bottom member. In this embodiment, since the two sealing members 3 and 4 are welded to both ends of the tubular film 2, respectively, a tubular container is obtained. In the case of a cylindrical container, the recesses 32 and 42 of the sealing members 3 and 4 on both ends of the cylindrical film 2 are welded so that they face each other in the longitudinal direction of the container (vertical direction in FIG. 1). Alternatively, the recess 21 may be formed in an intermediate portion of the tubular film 2 where no film exists, and the recess 21 of the tubular film 2 may be formed in a groove shape continuous from one end to the other end. By comprising in this way, self-supporting property improves and the rigidity of a container also becomes high. Moreover, since wrinkles do not enter the cylindrical film near the sealing member, the appearance is also improved.

In the present invention, when one end of the tubular film 2 is welded and closed, and the sealing member 3 is welded to the other end, a tubular container is obtained. In addition, the sealing members 3 and 4 are not only disposed at the end of the tubular film 2 as a container lid or bottom member, but are also disposed in the middle of the tubular film 2 as partitioning members or shape maintaining members. Also good.
The shape of the sealing members 3 and 4 is not limited as long as they are welded to the tubular film 2 on the peripheral surface thereof, but when viewed from a plane (hereinafter sometimes referred to as “plan view”). When the outer peripheral shape is circular, oval or elliptical, welding with the tubular film 2 becomes easy. One or two or more of the sealing members 3 and 4 may be annular, and the inner peripheral shape in that case can be not only a circular shape but also an arbitrary shape.

The sealing members 3 and 4 are formed with recesses 32 and 42 shown in FIG. The dents 32 and 42 contact the convex seal members corresponding to the groove-like dents 32 and 42 from the outside of the tubular film 2, press the tubular film 2 against the dents 32 and 42, and weld them. Is.
The dents 32 and 42 may be provided in at least one of the sealing members 3 and 4, but when two dents 32 and 42 are provided so as to face each other, the ridges corresponding to the groove-like dents 32 and 42 are formed from the outside of the tubular film 2. When the sealing member abuts and the tubular film 2 is pressed and welded into the recesses 32 and 42, the sealing members 3 and 4 can be pressed between the two sealing members, which is preferable.
The size of the recesses 32 and 42 is not particularly limited, but of the outer peripheral lengths of the sealing members 3 and 4 in plan view, the outer peripheral lengths of the recesses 32 and 42 are the main welding surfaces 31 and 4 of the sealing members 3 and 4. It is preferably shorter than 41.

Although the sealing members 3 and 4 may be flat plate shapes, as shown in FIG. 3, it is preferable that the welding surfaces 31 and 41 of the sealing member include side walls 34 and 44 on the periphery. Thereby, since the welding surfaces 31 and 41 can be provided in the outer surface of the side walls 34 and 44 and the cylindrical film 2 can be welded, even if a sealing member is thin and lightweight, a wide welding surface is obtained. By welding the wide welding surfaces 31 and 41 and the tubular film 2, high welding strength can be easily realized, so that it is possible to suppress moisture intrusion from the welded portion and liquid formation dispersion of the contents.
In addition, the sealing members 3 and 4 may be provided on the outer side or the inner side with another member that gives a function necessary for the container, such as a dispensing inlet member, protruding. Furthermore, when the sealing members 3 and 4 are annular, these other members can be provided by fitting or screwing.
In the case where the sealing member 3 is annular, by providing another member at the opening, it is possible to provide a lid that closes one end of the container 1. When the sealing member 4 is annular, by providing another member in the opening, the bottom of the other end of the container 1 can be closed. The separate member may be detachable. In this case, the openings of the annular sealing members 3 and 4 can be opened again to be used for taking out the contents or washing the inside.
2 and 3 show an example in which a pouring inlet member 331 having a pouring inlet 33 is fitted to the annular sealing member 3 to form a lid for closing one end of the container 1. The pouring inlet member 331 can be attached after the tubular film 2 is welded to the sealing member 3. Thereby, even when manufacturing the container 1 that requires the protruding pouring inlet 33, the pouring inlet 33 does not get in the way when the tubular film 2 is welded to the sealing member 3, and the pouring inlet 33 The shape and dimensions can be arbitrarily changed by simply replacing the dispensing inlet member 331. Note that the dispensing inlet member 331 of this embodiment has a recess 332 at a position corresponding to the recess 32 of the sealing member 3, but the sealing member 3 has an edge extending inward, and the dispensing inlet member 331. Is small, the outlet member 331 may not have the recess 332.
One of the sealing members 3 and 4 at both ends may be a lid and the other may be a bottom, and these may not be distinguished. One surface of the tubular film 2 may be the bottom, and the sealing members 3 and 4 at both ends may be the side surfaces of the container 1.

  The sealing members 3 and 4 are not limited in material, and may be glass, metal, or wood. However, the sealing members 3 and 4 need to be capable of being welded to the tubular film 2 on the peripheral surface thereof. Accordingly, at least the peripheral surfaces of the sealing members 3 and 4 are preferably made of a resin that can be welded to the sealant layer of the tubular film 2, and the sealing members 3 and 4 are preferably injection-molded with a resin. When the sealing members 3 and 4 are a metal foil, a laminate including a gas barrier layer composed of a film or a resin layer having a vapor deposition layer, or a laminate including a printing layer or a metal layer for decoration, these It is preferable to use an in-mold molding method in which a layer that imparts a function (function-imparting layer) is bonded to a resin to be injected and then molded. It is preferable to provide an adhesive layer on the surface of the function-imparting layer that adheres to the resin.

  The surface that becomes the outer surface of the function-imparting layer during in-mold molding is the film when the function-imparting layer is laminated on the film, and the film is the outer surface. It is preferable to laminate a coat layer. As the overcoat layer, a varnish or a resin layer can be used. When the sealant layer of the tubular film 2 and a resin layer that can be welded are used as the overcoat layer, when the welding surface of the sealing member has a side wall at the periphery, the overcoat layer extends to the side wall and the tubular film 2 It is preferable because it can be welded. When the resin to be injected can be welded to the sealant layer of the tubular film 2, the overcoat layer may not be provided on the side wall portion to be welded to the tubular film 2. In particular, when the overcoat layer has poor weldability such as varnish, it is preferable not to provide the overcoat layer on the side wall portion welded to the tubular film 2. In addition, even when the film is an outer surface, an overcoat layer made of a resin that can be welded to the sealant layer of the tubular film 2 may be provided on the side wall portion in order to facilitate welding with the sealant layer of the tubular film 2. .

  When inserting the sealing members 3 and 4 into the tubular film 2, the tubular film 2 may be stretched, but between the tubular film 2 and the welding surface other than the recesses of the sealing members 3 and 4. It is preferable that the sealing members 3 and 4 are disposed at the welded portions of the tubular film 2 by providing a gap and providing a slack, so that the insertion operation is facilitated. In particular, it is suitable when the sealing members 3 and 4 are arranged in the middle of the tubular film 2 to become a partition member or a shape holding member. Further, when the tubular film 2 includes a layer that is difficult to stretch, such as a metal foil or a biaxially stretched film, the sealing members 3 and 4 can be easily welded to the tubular film 2 without causing wrinkles or slack. . Further, when the cylindrical film 2 includes a gas barrier layer such as a metal vapor-deposited layer or a ceramic vapor-deposited layer in which a ceramic such as a metal oxide is vapor-deposited, the cylindrical film 2 on the container housing side from the sealing members 3 and 4. Since no crack is formed in the deposited layer, high gas barrier properties can be secured.

The timing at which the tubular film 2 is welded to the peripheral surfaces of the recesses 32 and 42 can first weld the peripheral surfaces of the recesses 32 and 42 out of the entire welding surfaces 31 and 41. This welded portion also functions as positioning of the sealing members 3 and 4 with respect to the tubular film 2. Further, the tubular film 2 is welded by the force to shrink the stretched tubular film 2, and the welding surfaces 31 and 41 (hereinafter referred to as “main welding surfaces”) of the sealing members 3 and 4 other than the recesses 32 and 42. It is easy to weld hermetically.
When the tubular film 2 is first welded to the peripheral surfaces of the recesses 32 and 42, the main welding surfaces 31 and 41 and the tubular film 2 are pressed against the peripheral surfaces of the recesses 32 and 42 while they are not welded. For this reason, the entire circumference of the welded portion of the tubular film 2 is stretched, and the strain generated in the tubular film 2 becomes relatively small. Therefore, when the tubular film 2 is difficult to stretch or when stretched, cracks are generated in the deposited layer. Even if there is a possibility of entering, it can be easily welded.

  Moreover, after welding the main welding surfaces of the welding surfaces 31 and 41 other than the dents 32 and 42 of the sealing members 3 and 4 to the tubular film 2 first, the dents 32 and 42 may be welded to the tubular film 2. it can. In this case, since distortion generated in the tubular film 2 becomes large, it is suitable when the tubular film 2 is easy to stretch. When the tubular film 2 is difficult to stretch, it is necessary to increase the dents 32 and 42 or to reduce the gap between the sealing members 3 and 4 and the welding surface other than the dent. In this case, one end of the tubular film 2 is welded, or the sealing member 4 is welded to the tubular film 2, and one end of the tubular film 2 is closed with the welded portion or the sealing member 4 as the bottom. The main welding surface 31 of the sealing member 3 is first welded to the tubular film 2 while leaving at least a part of the recess 32 of the sealing member 3 at the end, and the contents are removed from the recess 32 of the unwelded sealing member 3. By filling and then welding the recess 32 of the sealing member 3 with the tubular film 2 and sealing it, a package body in which the contents are stored can be configured.

First, a part of the main welding surface of the sealing member 3 and the tubular film 2 are welded and positioned, and then a part of the recesses 32, 42, preferably the vicinity of the center of the recesses 32, 42 and the tubular shape. By welding the film 2 and finally welding the unwelded portion, it is possible to ensure welding with the tubular film 2 at the boundary between the recesses 32 and 42 of the sealing members 3 and 4. Also in this case, the tubular film 2 is brought into close contact with the unwelded main welding surfaces 31 and 41 of the sealing members 3 and 4 other than the recesses 32 and 42 by the force of the stretched tubular film 2 to shrink. Therefore, it becomes easy to perform airtight welding. And the magnitude | size of the distortion which generate | occur | produces in the cylindrical film 2 can be adjusted with the length of a part of main welding surfaces 31 and 41 of the sealing members 3 and 4 and the cylindrical film 2 welded initially. .
In order that the tubular film 2 can be displaced along the peripheral surfaces of the main welding surfaces 31 and 41 of the sealing members 3 and 4 when the recesses 32 and 42 of the sealing members 3 and 4 are welded, the main welding is performed. When a part of the surfaces 31 and 41 is welded to the tubular film 2 first, it is preferable that the space between the welded portion and the recesses 32 and 42 is not welded along the peripheral surfaces of the main welding surfaces 31 and 41. . For this reason, as a welding part provided by positioning initially, the position furthest from the dents 32 and 42 along the peripheral surface of the main welding surfaces 31 and 41 can be illustrated. For example, when two dents are provided 180 ° apart from the sealing member, a position 90 ° away from the dent is positioned and welded, and when only one dent of one sealing member is provided, the dent 180 is provided. It is possible to position and weld a position separated by °. When welding the dent after positioning welding, the circumferential surface length between the positioning welding portion and the dent is distributed as evenly as possible so that the non-welded tubular film 2 is in close contact with the main welding surfaces 31 and 41. It is possible to suppress the distortion of the strain when it is performed.

In the present invention, the cylindrical film 2 is stressed by the depressions 32 and 42 from the outside of the tubular film 2 with the protruding seal member corresponding to the groove-like depressions 32 and 42 of the sealing members 3 and 4. At this time, other than the case where the main welding surfaces 31, 41 serving as the boundary between the recesses 32, 42 of the sealing members 3, 4 are welded to the tubular film 2 first and then the recesses 32, 42 are welded to the tubular film 2. Since the unwelded portion of the main welding surfaces 31 and 41 communicates with the recesses 32 and 42, the tubular film 2 stretched when the cylindrical film 2 is pressed toward the recesses 32 and 42. The tubular film 2 is brought into close contact with the main welding surfaces 31 and 41 other than the recesses 32 and 42 of the sealing members 3 and 4 due to the force of contraction, that is, elasticity in elastic deformation.
In this way, in order to develop close contact due to elastic deformation, the elongation (strain) when the tubular film 2 is stretched by the depressions 32 and 42 is the load of the upper yield stress on the tubular film 2. It is preferable that the strain is smaller than the strain at the time of receiving. When the tubular film 2 does not show the upper yield stress, the elongation (strain) when the tubular film 2 is stretched by the dents 32 and 42 is the stress (the permanent strain at unloading becomes 0.2%) ( It is preferably smaller than the strain when subjected to a load of 0.2% proof stress. Thereby, distortion can be added to the cylindrical film 2 in the range which can be elastically deformed which does not reach the yield point, and rapid plastic deformation of the cylindrical film 2 can be suppressed.

Although the present invention has been described based on the preferred embodiments, the present invention is not limited to the above-described embodiments, and various modifications can be made.
For example, the groove-like recesses 32 and 42 of the sealing members 3 and 4 have a semicircular shape in plan view in which the ridge line with the main welding surface is rounded, but the protrusions corresponding to the recesses 32 and 42 are formed. As long as the cylindrical film 2 can be brought into close contact with the recesses 32 and 42 by the sealing member, any shape such as a U shape or a V shape can be obtained.

  Hereinafter, with reference to FIGS. 4 and 5, the present invention will be described in detail based on examples in which the container of the present invention is applied to a battery exterior, but the present invention is not limited to this.

<Tubular film 2>
A gas barrier layer made of 12 μm aluminum foil and a sealant layer made of 60 μm unstretched PP film are dry-laminated using a urethane adhesive on one side of a 15 μm biaxially stretched 6 nylon film to form a flexible substrate. Obtained. The flexible substrate was cut into a 60 mm × 130 mm rectangle. A tubular film 2 was produced by forming a joint seal portion (not shown) with the sealant layer of the flexible base material cut into a rectangle on the inside and overlapping the 10 mm ends of the short sides. The joint seal part was creased so as to overlap the unwelded tubular film 2.

<Sealing members 3 and 4>
A gas barrier layer made of 12 μm aluminum foil is placed on one side of a 15 μm biaxially stretched 6 nylon film, and a 60 μm unstretched PP film serving as an adhesive layer and an overcoat layer on the aluminum foil and nylon film, respectively. A film for insert molding was obtained by laminating by dry lamination using a system adhesive.

  Two of the obtained insert molding films 35 and 45 were cut into a 30 mm × 50 mm rectangle, and a slit having a width of 0.2 mm and a length of 25 mm was provided at the center. The slit is covered with resin in the vicinity of the center in the length direction of two metal plates with a width of 25 mm, which are plated with aluminum and copper with a thickness of 0.2 mm and copper, and protrudes 10 mm inward and outward from the slit. Thus, an insert member having metal plates 36 and 46 was produced. Insert the insert member so that the adhesive layer is on the extruder side in the mold for molding the sealing members 3 and 4 shown in FIG. Then, PP was injected into the metal mold, and sealing members 3 and 4 with electrodes were produced.

  When the PP molding portions 38 and 48 of the sealing members 3 and 4 with electrodes are assumed to be rectangular parallelepipeds ignoring the roundness of the metal plates 36 and 46, the dents 32 and 42 and the ridgeline, all are 14 mm long × 40 mm wide × high The main surface of 7 mm in length and 12 mm × 40 mm was used as a box shape having an opening as a bottom plate, and the ridgeline on the outer periphery of the bottom plate and side walls was rounded to a radius of 2 mm and chamfered. The wall thickness surrounding the bottom plate, the side wall, and the metal plate was all 1 mm. The insert molding films 35 and 45 were bonded to the outer surface of the side wall with a width of 2 mm. The groove-like recesses 32 and 42 of the sealing members 3 and 4 with electrodes were respectively provided on the outer surfaces of the short side walls facing each other as semicircles having a diameter of 3 mm, and the edge ridgeline was rounded to a radius of 2 mm and chamfered. Unbonded insert molding films 35 and 45 were removed and trimmed to produce sealing members 3 and 4 shown in FIG.

<Arrangement of sealing members 3 and 4>
The insert molding films 35 and 45 of the obtained sealing members 3 and 4 with electrodes are made to face each other, and a power generation element such as an anode material or a cathode material is connected therebetween, and the PP molding portions 38 and 48 are outside. Thus, the cylindrical film 2 was inserted from one end, and the electrode-sealed sealing members 3 and 4 were arranged at both ends of the cylindrical film 2. The sealing part of the tubular film 2 is positioned in the center of the long side wall outer surface of the sealing members 3 and 4 with electrodes, and the insert molding films 35 and 45 bonded to the side wall outer surfaces of the sealing members 3 and 4 with electrodes. Was arranged so as to overlap the cylindrical film 2 with a width of 1 mm.

<Welding of sealing member 3>
A stainless steel plate having a width of 35 mm is inserted and brought into contact with the inner surfaces of both long side walls of the PP molding portion 38 of the sealing member 3, and a pair of 10 mm wide plate-like plates are formed from both outer sides of the tubular film 2. The tubular film 2 and the sealing member 3 were sandwiched between the welding members, and heated and pressed to weld the flat portions of both side walls of the tubular film 2 and the sealing member 3.
A pair of semicircular arc welding members having a width of 10 mm corresponding to the welding surfaces of the groove-like recesses 32, 32 of the sealing member 3 from both outer sides of the cylindrical film 2. By sandwiching the recesses 32, 32, the welding member is pushed into the recesses 32, 32, and stress is applied to the tubular film 2 to bring it into close contact with the recesses 32, 32, and heat and pressure are applied to the recesses 32, 32 of the sealing member 3. did.
Convex ridge with a width of 10 mm having a shape similar to the number 3 in plan view corresponding to the chamfering of the ridges of the dents 32, 32 from both outer sides of the tubular film 2 to the short side walls of the PP molding portion 38 of the sealing member 3. The cylindrical film 2 and the sealing member 3 were sandwiched between these sealing members, and heated and pressurized to weld both end uneven portions on both side walls of the cylindrical film 2 and the sealing member 3.

<Welding of sealing member 4>
In the same manner as the sealing member 3, the flat portions of both side walls of the tubular film 2 and the sealing member 4 were welded to prepare the container 1.
A nozzle was inserted into the gap between one recess 42 of the sealing member 4 and the tubular film 2, and the electrolyte was injected into the container 1.
Similarly to the sealing member 3, the tubular film 2 is welded to the recesses 42 and 42 of the sealing member 4, and the container 1 is applied as a battery packaging material in which the power generation element and the electrolytic solution are housed as shown in FIG. 4. did.

DESCRIPTION OF SYMBOLS 1 ... Container, 2 ... Cylindrical film, 3 ... 1st sealing member, 4 ... 2nd sealing member, 21 ... Recessed part of cylindrical film, 31 ... Welding surface of 1st sealing member, 32 ... Indentation of first sealing member, 33... Dispensing inlet, 41 .. welding surface of second sealing member, 42 .. depression of second sealing member.

Claims (8)

A tubular film at least the inner surface has a weldability, the total of the welding method of the sealing member in the container with the two sealing members, the sealing of both ends of the tubular film, the tubular film At one end, a first sealing member having a groove-like recess for accommodating a part of the tubular film on the welding surface is inserted and disposed at the welding location of the tubular film, and the outside of the tubular film a sealing member of convex corresponding to the groove-like recess from pressing said tubular film in the groove-like recess, said first sealing member stretched the tubular film in the groove-like recess A second seal having a groove-like recess for accommodating a part of the tubular film on the welding surface at the other end of the tubular film, hermetically welded to seal one end of the tubular film. the member, the at least one of said groove-like recess Welded to the tubular film leaving, after filling the content items from the groove-like recess, the groove-like recess welded hermetically to said tubular film, the package contents article is housed A sealing member welding method, comprising:   The said sealing member is arrange | positioned in the welding location of the said cylindrical film by making a clearance gap exist between the said cylindrical film and welding surfaces other than the said groove-shaped dent of the said sealing member. The sealing member welding method described.   The strain when the tubular film is stretched by the groove-like recess is smaller than the strain when the tubular film is subjected to an upper yield stress or a load of 0.2% proof stress. The sealing member welding method described. Even without least it has a tubular film whose inner surface has a weldability, and a total of two sealing members for sealing the ends of the tubular film, to one end of the tubular film, the tubular film The first sealing member having a groove-like recess for accommodating a part of the welded surface on the welding surface is hermetically welded , and the groove-like shape is formed in the tubular film welded to the first sealing member by the groove-like recess. recess is formed in the other end of the tubular film, a second sealing member having a welding surface of the groove-like recess for accommodating a portion of the tubular film, the groove-like recess of at least a A container having a gap that is welded to the cylindrical film leaving a portion and is filled with the contents from the groove-shaped recess . A cylindrical film having at least an inner surface weldable, and a total of two sealing members for sealing both ends of the cylindrical film, and one end of the cylindrical film is provided at one end of the cylindrical film. A groove-shaped recess is formed in the tubular film welded to the first sealing member by the groove-shaped recess, wherein the first sealing member having a groove-shaped recess for accommodating the groove is hermetically welded. A second sealing member having a groove-like recess for accommodating a part of the cylindrical film on the welding surface is hermetically welded to the other end of the tubular film, and the groove-like recess A groove-shaped recess is formed in the tubular film welded to the second sealing member, and the groove-shaped recess of the first sealing member is formed at both ends of the tubular film, and the second said groove-like recess and faces of the sealing member, the tubular the sealing member is absent Fi Arm also is formed the groove-shaped recess in the intermediate portion, the container, characterized in that the groove-like recess which is continuous from one end of the tubular film to the other, which are formed. The container according to claim 4 or 5 , wherein the sealing member includes a side wall at a peripheral edge, and the tubular film is welded to an outer surface of the side wall. A container according to any one of at least one of said first sealing member and said second sealing member claims 4 cyclic 6.   The container according to any one of claims 4 to 7, wherein the cylindrical film and the sealing member are a laminate including a gas barrier layer.

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