Container, method for manufacturing a container, apparatus for manufacturing a container, sealing bar and film assembly

Abstract

Provided is a container that includes a portion in which a first film constituting a container body, a cut strip, a belt-shaped base, and a second film constituting the container body are superposed in the stated order. A joining region in which the first film, the cut strip, the belt-shaped base, and the second film are joined with each other is formed across the cut strip and the belt-shaped base, a tab is formed by a cut that penetrates through at least the first film and the cut strip in a non-joining region adjacent to the joining region, and the edge of the joining region on the tab side thereof is at least partially not orthogonal to the longitudinal direction of the cut strip.

Description

Technical Field

[0001] The present invention relates to a container, a method for manufacturing the container, a manufacturing apparatus for the container, a seal bar, and a film assembly.

Background Art

[0002] Conventionally, in a bag-shaped container for packaging drugs, foods, etc., a technique for forming an opening in a container body using a member called a tear strip piece or a cut tape is known. For example, Patent Document 1 discloses a film forming first and second regions facing each other, a long tear strip piece joined to the first region, a long strip-shaped base portion disposed between the tear strip piece and the second region, a tab formed by a cut penetrating the first region of the film and the tear strip piece, and an enclosure seal portion joining the first region and the second region in an area surrounding the tab.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the container described in the above Patent Document 1, when the tear strip piece is picked up and pulled with a tab, the strip-shaped base portion is broken at the enclosure seal portion, and thereafter, the tear strip piece is separated from the strip-shaped base portion and pulled to form an opening in the container body. However, since it is necessary to pull the tear strip piece with a relatively large force at the moment of breaking the strip-shaped base portion, there is still room for improvement in terms of the smoothness of the separation between the tear strip piece and the strip-shaped base portion.

[0005] Therefore, the present invention aims to provide a container in which an opening is formed in the container body using a tearing strip, by making the separation of the tearing strip and the strip-shaped base using the joining region smoother, thereby making the formation of the opening easier, as well as a method for manufacturing the container, a device for manufacturing the container, a sealing bar, and a film assembly. [Means for solving the problem]

[0006] [1] A container comprising a portion in which a first film constituting the container body, a tear strip, a strip-shaped base, and a second film constituting the container body are stacked in this order, wherein a joining region is formed where the first film, the tear strip, the strip-shaped base, and the second film are joined to each other, and the joining region is formed by a cut that penetrates at least the first film and the tear strip, and the tab-side edge of the joining region is at least partially not perpendicular to the longitudinal direction of the tear strip. [2] The container according to [1], wherein the tab-side edge of the joining region includes at least one projection. [3] The container according to [2], wherein the projection is mountain-shaped, trapezoidal, rectangular, or arc-shaped. [4] The container according to [2] or [3], wherein the width of the projection is 0.3 mm or more. [5] The container according to [4], wherein the width of the above-mentioned protrusion is 3 mm or less. [6] The container according to any one of items [2] to [5], wherein the height of the protruding part is 0.3 mm or more. [7] The container according to [6], wherein the height of the protruding portion is 5 mm or less. [8] The container according to any one of [2] to [7], wherein at the tab-side edge of the joining region, a plurality of protrusions are formed overlapping the tear strip. [9] The container according to [8], wherein the width of the area in which the multiple protrusions are formed is greater than or equal to the width of the tear strip.

[10] The container according to any one of [1] to [9], further comprising: a first base formed following the strip-shaped base; a second base facing the first base and joined to the first film; and first and second engaging portions protruding from the first and second bases, respectively, and capable of engaging with each other.

[11] The container according to any one of [1] to

[10] , wherein the first film and the second film are formed by folding a single film.

[12] The joining region is the container according to any one of [1] to

[11] , which at least partially encloses the tab.

[13] The container body is bag-shaped, as described in any one of items [1] to

[12] .

[14] A method for manufacturing a container, comprising the steps of: overlapping and joining a first film constituting the container body, a tear strip, a strip-shaped base, and a second film constituting the container body in this order to form a joining region that crosses the tear strip and the strip-shaped base; and forming a tab in a non-joined region adjacent to the joining region by a cut that penetrates at least the first film and the tear strip, wherein the tab-side edge of the joining region is at least partially not perpendicular to the longitudinal direction of the tear strip.

[15] A container manufacturing apparatus comprising: means for joining together a first film constituting the container body, a tear strip, a strip-shaped base, and a second film constituting the container body in this order, thereby forming a joining region that crosses the tear strip and the strip-shaped base; and means for forming a tab in a non-joining region adjacent to the joining region by cutting through at least the first film and the tear strip, wherein the tab-side edge of the joining region is at least partially not perpendicular to the longitudinal direction of the tear strip.

[16] A sealing bar having a planar shape that encloses at least three sides of a predetermined area, wherein at least one side of the planar shape has an inner edge that includes at least one projection.

[17] A container comprising a portion in which a first film constituting the container body, a tear strip, a strip-shaped base, and a second film constituting the container body are superimposed in this order, further comprising a protective member joined from the strip-shaped base side to a region covering a tab formed by a cut penetrating the first film, the tear strip, and the strip-shaped base, wherein a joining region in which the first film, the tear strip, the strip-shaped base, and the protective member are joined to each other is formed traversing the tear strip and the strip-shaped base, the tab is formed in a non-joining region adjacent to the joining region, and the edge of the joining region on the tab side is at least partially not perpendicular to the longitudinal direction of the tear strip.

[18] The container according to

[17] , wherein the container body is bag-shaped, and the tab-side edge of the joining region includes at least one protrusion, the width of the protrusion is 0.3 mm or more and 3 mm or less, and the height of the protrusion is 0.3 mm or more and 5 mm or less.

[19] The container according to

[17] or

[18] , further comprising: a first base formed following the strip-shaped base; a second base facing the first base and joined to the first film; and first and second engaging portions protruding from the first and second bases, respectively, and capable of engaging with each other.

[20] A film assembly comprising a film and at least two elongated members attached to one surface of the film, spaced apart from each other along one direction of the film, wherein the elongated members include a tear strip, a strip-shaped base superimposed on the tear strip, and a protective member joined from the strip-shaped base side to a region covering a tab formed by a cut penetrating the film, the tear strip, and the strip-shaped base, wherein a joining region where the film, the tear strip, the strip-shaped base, and the protective member are joined to each other is formed across the tear strip and the strip-shaped base, the tab is formed in a non-joined region adjacent to the joining region, and the tab-side edge of the joining region is at least partially not perpendicular to the longitudinal direction of the tear strip.

[21] The film assembly according to

[20] , wherein the tab-side edge of the joining region includes at least one projection, the width of the projection being 0.3 mm or more and 3 mm or less, and the projection height being 0.3 mm or more and 5 mm or less.

[22] The film assembly according to

[20] or

[21] , further comprising: a first base formed following the strip-shaped base; a second base facing the first base and joined to the film; and first and second engaging portions protruding from the first and second bases, respectively, and capable of engaging with each other.

[0007] According to the above configuration, when the tear strip is pulled, a concentrated force acts earlier than on other parts of the tab-side edge of the joining region, in the portion that is not perpendicular to the longitudinal direction of the tear strip. This allows the strip base to be fractured with less force, and the separation of the tear strip and the strip base using the joining region becomes smoother. [Brief explanation of the drawing]

[0008] [Figure 1] This is a plan view of a bag-shaped container according to the first embodiment of the present invention. [Figure 2] This is a cross-sectional view taken along line II-II in Figure 1. [Figure 3] This is a cross-sectional view taken along line III-III in Figure 1. [Figure 4A] This diagram illustrates the principle by which the strip-shaped base breaks at the intersection with the bonding region. [Figure 4B] This diagram illustrates the principle by which the strip-shaped base breaks at the intersection with the bonding region. [Figure 5] This is an enlarged view of the sealed area surrounding the bag-shaped container shown in Figure 1. [Figure 6] This figure shows the manufacturing process of a bag-shaped container according to the first embodiment of the present invention. [Figure 7] Figure 6 is an enlarged cross-sectional view showing a part of the manufacturing process. [Figure 8] This is a plan view of a bag-shaped container according to a second embodiment of the present invention. [Figure 9]It is an enlarged view of the surrounding seal portion of the bag-shaped container shown in FIG. 8. [Figure 10] It is a plan view of a bag-shaped container according to the third embodiment of the present invention. [Figure 11] It is a cross-sectional view taken along line XI-XI of the bag-shaped container shown in FIG. 10. [Figure 12] It is a cross-sectional view of a bag-shaped container according to the fourth embodiment of the present invention. [Figure 13] It is a plan view of a bag-shaped container according to the fifth embodiment of the present invention. [Figure 14] It is a cross-sectional view taken along line XIV-XIV of the bag-shaped container shown in FIG. 13. [Figure 15] It is a diagram showing a configuration example of a film assembly according to the fifth embodiment of the present invention. [Figure 16] It is a diagram showing a manufacturing process of a bag-shaped container using the film assembly shown in FIG. 15.

Embodiments for Carrying Out the Invention

[0009] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the present specification and drawings, components having substantially the same functional configuration are denoted by the same reference numerals, and redundant descriptions are omitted.

[0010] (First Embodiment) Figure 1 is a plan view of a bag-shaped container according to a first embodiment of the present invention, Figure 2 is a cross-sectional view taken along line II-II of Figure 1, and Figure 3 is a cross-sectional view taken along line III-III of Figure 1. As shown, the bag-shaped container 100 includes a film 110, a tear strip 120, a strip-shaped base 130, and a zipper portion 140. The film 110 is folded over at both sides 101A and 101B of the bag-shaped container 100, and the opposing portions are joined at the top seal portion 102, the bottom seal portion 103, and the back seal portion 104 to form the bag-shaped container body. The method of forming the container body with the film 110 is not particularly limited; for example, the film 110 may be folded over at only one side 101A (or side 101B) of the bag-shaped container 100, and a side seal portion may be formed on the opposite side. Alternatively, the container body may be formed with two films by forming side seal portions on the sides 101A and 101B. Furthermore, for example, a bag-shaped container may be provided without a top seal portion 102 or a bottom seal portion 103 being formed for the purpose of sealing contents, and the top seal portion or bottom seal portion may be formed afterward. Also, although this embodiment describes an example in which the bag-shaped container body is formed from a film 110, other embodiments may provide a container that includes a container body other than a bag shape.

[0011] The tear strip 120 and the strip-shaped base 130 are elongated members extending in the same direction from one another, and are interposed between two surfaces of the film 110 that forms the container body. In the following description, these two surfaces will also be referred to as the first film 111 and the second film 112. As described above, in the illustrated example, the first film 111 and the second film 112 are formed by folding a single film, but in other examples, the first film 111 and the second film 112 may be formed from multiple separate films. As shown in the cross-sectional views of Figures 2 and 3, in the portion where the tear strip 120 and the strip-shaped base 130 are interposed, the first film 111, the tear strip 120, the strip-shaped base 130, and the second film 112 are stacked in this order. Note that these members may be stacked with other members in between. Also, the stacked members are not necessarily joined to each other, except for the surrounding seal portion 160 which will be described later. Specifically, the tear strip 120 is joined to the first film 111, and the strip-shaped base 130 is joined to both the tear strip 120 and the first film 111, but the strip-shaped base 130 and the second film 112 are not joined except for the surrounding seal portion 160.

[0012] Film 110 is, for example, a single-layer or multi-layer thermoplastic resin film. The thermoplastic resin is, for example, low-density polyethylene (LDPE), linear low-density polyethylene (LLDPE), or polypropylene (PP). PP is, for example, homopolypropylene (HPP), random polypropylene (RPP), or block polypropylene (BPP). In the case of a multi-layer film, biaxially oriented polypropylene (OPP), biaxially oriented polyethylene terephthalate (OPET), or biaxially oriented nylon (ONy) may be used as the surface material. The resin forming film 110 does not necessarily have to be derived from fossil fuels; for example, it may be an environmentally friendly bioplastic, or a mixture of a fossil fuel-derived resin and a bioplastic. Suitable bioplastics include, for example, biopolyethylene and biopolypropylene. BioPET and bionylon can also be used as bioplastics. Film 110 may also include layers of metallic materials such as aluminum or inorganic materials.

[0013] The tear strips 120 and the strip-shaped base 130 are formed, for example, by extrusion molding of a resin composition containing a polyolefin resin. The polyolefin resin is, for example, LDPE, LLDPE, or PP. PP is, for example, HPP, RPP, or BPP. The resin forming the tear strips 120 and the strip-shaped base 130 does not necessarily have to be derived from fossil fuels; it may be, for example, an environmentally friendly bioplastic, or a mixture of a fossil fuel-derived resin and a bioplastic. As bioplastics, for example, biopolyethylene and biopolypropylene can be suitably used. Known additives, such as stabilizers, antioxidants, lubricants, antistatic agents, or colorants, may be added to at least one of the materials of the tear strips 120 or the strip-shaped base 130 as needed.

[0014] Here, as will be described later, when an opening is formed in the container body of the bag-shaped container 100, specifically in the first film 111, the tear strip 120 interfacially peels off from the strip-shaped base 130. Therefore, in this embodiment, the tear strip 120 and the strip-shaped base 130 are formed from a combination of resins with low compatibility with each other. Specifically, the tear strip 120 may be formed from a polypropylene resin, and the strip-shaped base 130 may be formed from a low-density polyethylene resin. Combinations of resins with low compatibility, including resins other than polyolefin resins, are exemplified below in the form of a first resin / second resin. LDPE / RPP, LLDPE / RPP, LDPE / HPP, LLDPE / HPP, LDPE / Polystyrene (PS), LLDPE / PS, RPP / PS, HPP / PS, LDPE / Polyethylene Terephthalate (PET), LLDPE / PET, RPP / PET, HPP / PET, PS / PET, LDPE / Nylon (Ny), LLDPE / Ny, RPP / Ny, HPP / Ny, PS / Ny. Note that at least a portion of the LLDPE may be metallocene-based linear low-density polyethylene. As described above, the tear strips 120 and the strip-shaped base 130 may be formed from bioplastics, or a mixture of fossil fuel-derived resins and bioplastics. Biopolyethylene and biopolypropylene can be suitably used as bioplastics. In addition, bioPET, biopolystyrene, and bionylon can also be used as bioplastics.

[0015] As shown in Figure 3, the zipper portion 140 includes a first base portion 141 formed following the strip-shaped base portion 130, a second base portion 142 facing the first base portion 141 and joined to the first film 111, and engaging portions 143A and 143B that protrude from the first base portion 141 and the second base portion 142, respectively, and are capable of engaging with each other. The zipper portion 140 is formed from, for example, the same material as the strip-shaped base portion 130 described above. The shape of the engaging portions 143A and 143B is not limited to the male and female type shown in the illustration, but can be any shape of a known zipper engaging portion, such as a claw-shaped, hook-shaped, or knob-shaped combination. In the illustrated example, engaging portion 143A is female and engaging portion 143B is female, but the reverse is also possible. Furthermore, the engaging portion does not have to be a single pair; for example, one or more pairs of additional engaging portions, such as the hook portions 144A and 144B shown by dashed lines, may be provided. The resin forming the zipper portion 140 does not necessarily have to be derived from fossil fuels; for example, it may be an environmentally friendly bioplastic, or a mixture of fossil fuel-derived resin and bioplastic. As bioplastics, for example, biopolyethylene and biopolypropylene can be suitably used. Known additives, such as stabilizers, antioxidants, lubricants, antistatic agents, or colorants, may be added to the material of the zipper portion 140 as needed.

[0016] In the bag-shaped container 100 according to this embodiment, the user can grasp and pull a tear strip 120 from a tab 150 formed near one side 101A of the bag-shaped container 100, causing the tear strip 120 to tear the first film 111 and form an opening in the container body. A notch 121 may be formed near the side 101B of the bag-shaped container 100 opposite to the tab 150, penetrating the first film 111 and the tear strip 120. Forming a notch 121 makes it easier to form the end of the tear, but if the film 110 is easily tearable, for example, the end of the tear can be formed even without a notch 121, so a notch 121 is not necessarily required. After the tear strip 120 creates an opening, access to the inside of the container body becomes possible through the gap between the first base 141 and the second base 142 of the zipper portion 140. The container body can be resealed by engaging the engaging portions 143A and 143B with each other, and the container body can be reopened by releasing the engagement.

[0017] The tab 150 and the surrounding seal portion 160 are formed for the operation of forming an opening in the container body using the tear strip 120 as described above. Specifically, the tab 150 is formed by a notch 151 that penetrates the first film 111, the tear strip 120, and the strip-shaped base portion 130, near one side 101A of the bag-shaped container 100. When forming an opening in the container body using the tear strip 120, the user can easily grasp and pull the tear strip 120 by lifting the tab 150 towards the first film 111. In the illustrated example, the notch 151 has a vase-shaped planar shape, and the open portion corresponding to the mouth of the vase is oriented in the direction in which the opening is formed by the tear strip 120. The planar shape of the notch 151 is not particularly limited, and the planar shape of the notch 151 in other examples may be, for example, C-shaped, U-shaped, or horseshoe-shaped.

[0018] The surrounding seal portion 160 is a joining region surrounding the tab 150 and includes an intersection 161 that crosses the tear strip 120 and the strip-shaped base portion 130. In the surrounding seal portion 160, the first film 111, the tear strip 120, the strip-shaped base portion 130 and the second film 112 are joined to each other, for example, by heat sealing or ultrasonic sealing. The tab 150 is formed in the non-joined region adjacent to the surrounding seal portion 160, that is, the region where the strip-shaped base portion 130 and the second film 112 are not joined. Note that the surrounding seal portion 160 only needs to surround the tab 150 at least partially and does not necessarily need to surround the entire circumference of the tab 150. In the illustrated example, the surrounding seal portion 160 has a U-shaped planar shape with both ends in contact with the side portion 101A of the bag-shaped container 100 on which the film 110 is folded, thereby surrounding three sides of the tab 150, excluding the side portion 101A. In other examples, the surrounding seal portion 160 may surround the tab 150 together with the top seal portion 102 or the side seal portion. Also, if the top seal portion is formed afterward, the entire circumference of the tab 150 does not need to be surrounded at the time the bag-shaped container is provided.

[0019] By surrounding the tab 150 with the enclosed sealing portion 160 as described above, the space formed between the first film 111 and the second film 112 in the non-joined region including the tab 150 is spatially separated from other spaces within the container body separated by the enclosed sealing portion 160, which is the joining region. Therefore, even if the tab 150 is formed by a cut 151 that penetrates the first film 111, the sealing performance of the container body can be maintained.

[0020] Furthermore, the notch 151 forming the tab 150 only needs to penetrate at least the first film 111 and the tear strip 120, and does not need to penetrate the strip-shaped base 130, for example, due to manufacturing errors. Even if the user grasps only the first film 111 and the tear strip 120 with the tab 150, the interfacial delamination between the tear strip 120 and the strip-shaped base 130 will occur, making it possible to open the container. Also, the notch 151 may partially penetrate the second film 112, for example, due to manufacturing errors, as long as the user does not grasp the second film 112 together with the tear strip 120 with the tab 150. As described above, since the space in which the tab 150 is formed is separated from the other spaces in the container body by the surrounding seal portion 160, the sealing performance of the container body is not affected even if the notch 151 partially penetrates the second film 112.

[0021] Furthermore, in this embodiment, as will be explained below with reference to Figures 4 and 5, the intersection 161 of the surrounding seal portion 160 forms a joining region that crosses the tear strip 120 and the strip-shaped base portion 130, and the edge of the joining region on the tab 150 side at the intersection 161 is shaped so that it is not perpendicular to the longitudinal direction of the tear strip 120 at least partially, thereby enabling smooth separation between the tear strip 120 and the strip-shaped base portion 130 when an opening is formed in the container body using the tear strip 120.

[0022] As shown in Figure 4A, before the pulling of the tear strip 120, starting from the tab 150, reaches the intersection 161, the strip-shaped base 130 is pulled together with the tear strip 120 and the first film 111, while being torn longitudinally at the portion corresponding to the extension of the cut 151. At this point, the resistance to pulling the tear strip 120 is relatively large because the strip-shaped base 130 is being torn, but as shown in Figure 4B, by breaking the strip-shaped base 130 at the intersection 161, the tear strip 120 separated from the strip-shaped base 130 beyond the intersection 161 can be pulled with relatively little resistance to tear the first film 111 and form an opening in the container body.

[0023] Here, as described above, at the intersection 161, the first film 111, the tear strip 120, the strip-shaped base 130, and the second film 112 are joined to each other. Therefore, as shown in Figure 4B, when the tension of the tear strip 120 reaches the intersection 161, a force acts to separate the first film 111, the tear strip 120, and the strip-shaped base 130, which are being pulled, from the second film 112, which is not being pulled. At the intersection 161, the second film 112 and the strip-shaped base 130 are joined with normal bonding strength, whereas the tear strip 120 and the strip-shaped base 130 are formed from a combination of resins with low compatibility as described above, and are therefore joined with relatively low bonding strength. Therefore, at the intersection 161, instead of the strip-shaped base 130 and the second film 112 being separated by the above force, interfacial delamination occurs between the tearing strip 120 and the strip-shaped base 130. As a result, at the intersection 161, a portion of the strip-shaped base 130 that had been pulled together with the tearing strip 120 breaks between it and the other portion of the strip-shaped base 130 that is joined to the second film 112.

[0024] Figure 5 is an enlarged view of the enclosed seal portion of the bag-shaped container shown in Figure 1. As shown, at the intersection 161 of the enclosed seal portion 160 intersecting the tear strip 120, at least one protrusion 162 is formed on the edge of the joining region on the tab 150 side. The protrusion 162 is the portion of the edge of the joining region that protrudes toward the tab 150 side. The protrusion 162 may protrude relative to the edge of the joining region as it would be if no protrusion 162 were formed, as in the illustrated example, or a recess may be formed on the edge of the joining region, with the protrusion 162 protruding from the bottom of the recess. In the latter case, the protrusion 162 does not necessarily have to protrude relative to the edge of the joining region as it would be if no protrusion 162 were formed. In the illustrated example, a continuous sawtooth shape is formed by multiple protrusions 162, but the protrusions 162 may be formed discretely. It is sufficient for at least one projection 162 to be formed overlapping the tearing strip 120, and it is more preferable for multiple projections 162 to be formed overlapping the tearing strip 120.

[0025] The formation of the protrusion 162 as described above makes it easier to break the strip-shaped base 130 at the intersection 161 when pulling the tear strip 120 to form an opening in the container body. More specifically, when the tear strip 120 is pulled from the tab 150 side, the force that attempts to separate the first film 111, tear strip 120, and strip-shaped base 130, which are being pulled, from the second film 112, which is not being pulled, acts concentrated at the tip of the protrusion 162 before other parts. By concentrating the force at the tip of the protrusion 162, the strip-shaped base 130 can be broken with less force than when the force is dispersed, for example, because the edge of the joining region is formed in a straight line perpendicular to the longitudinal direction of the tear strip 120, and the tear strip 120 and the strip-shaped base 130 can be separated as shown in Figure 4B.

[0026] With the above configuration, the opening strength of the bag-shaped container according to this embodiment, that is, the maximum force required to pull the tear strip to form an opening in the container body, is reduced compared to when forming an opening in a bag-shaped container where no protrusions are formed in the joining region. If the opening strength when forming an opening in a bag-shaped container where no protrusions are formed in the joining region is taken as 100%, the opening strength of the bag-shaped container according to this embodiment is preferably 95% or less, more preferably 90% or less, even more preferably 80% or less, and particularly preferably 70% or less.

[0027] To effectively concentrate force, the width W of the projection 162, i.e., the dimension of each projection 162 in the width direction of the tearing strip 120, is preferably 100% or less of the width of the tearing strip 120, more preferably 80% or less, even more preferably 60% or less, and particularly preferably 45% or less. Assuming a typical tearing strip 120 width from the size of a user's finger that grasps the tearing strip 120, the width W of the projection 162 is preferably 3 mm or less, more preferably 2 mm or less, and even more preferably 1.3 mm or less. To stably form the projection 162 by heat sealing or ultrasonic sealing, the width W of the projection 162 is preferably 0.3 mm or more, more preferably 0.5 mm or more, and even more preferably 0.7 mm or more. When the above range is applied to a typical tearing strip 120 width, the width W is preferably 5% or more of the width of the tearing strip 120, more preferably 10% or more, and even more preferably 25% or more. Furthermore, in order to stably form the protrusions 162, the protrusion height H of the protrusions 162, that is, the height to which each protrusion 162 protrudes from the recesses or straight sections on both sides in the planar shape, is preferably 0.3 mm or more, more preferably 0.5 mm or more, and even more preferably 0.7 mm or more. Also, in order to avoid unnecessarily enlarging the surrounding seal portion 160, the protrusion height H of the protrusions 162 is preferably 5 mm or less, more preferably 2 mm or less, and even more preferably 1.5 mm or less. In addition, when multiple protrusions 162 are formed at the edge of the tab 150 side of the joining area by the surrounding seal portion 160, as in the illustrated example, the width R of the area in which the multiple protrusions 162 are formed is preferably greater than or equal to the width of the tear strip 120.

[0028] Furthermore, as described above, a similar effect can be obtained by forming a part where force is concentrated and acts before other parts, so it is not necessary to form a mountain-shaped protrusion as shown in the illustrated example. In other examples, a trapezoidal, rectangular, or arc-shaped protrusion may be formed. Also, even if it is not a shape called a protrusion, as long as the edge on the tab 150 side of the joining area overlapping the tearing strip 120 is at least partially perpendicular to the longitudinal direction of the tearing strip 120, a part will be created where force is concentrated and acts before other parts when the tearing strip 120 is tensed, and a similar effect can be obtained. Specifically, the shape of the edge on the tab 150 side of the joining area overlapping the tearing strip 120 may include at least one recess or an oblique angle formed at an angle to the longitudinal direction of the tearing strip 120.

[0029] Furthermore, the effects of the intersection portion 161 and the protruding portion 162 described above are achieved regardless of whether the surrounding seal portion 160 surrounds the tab 150. Therefore, in other embodiments of the present invention, the joining region formed across the tear strip and the strip-shaped base portion does not necessarily have to be a surrounding seal portion that surrounds the tab.

[0030] Next, an example of a method for manufacturing a bag-shaped container according to this embodiment will be described with reference to Figures 6 and 7. Figure 6 is a diagram showing the manufacturing process of a bag-shaped container according to the first embodiment of the present invention. Figure 7 is an enlarged cross-sectional view showing a part of the manufacturing process shown in Figure 6.

[0031] As shown in Figure 6, the manufacturing apparatus 600 includes a long member joining means 610, a tab forming means 620, a notch forming means 630, a back seal forming means 640, and a top / bottom seal forming means 650. If the bag-shaped container is not provided with the aforementioned notch 121, the notch forming means 630 is omitted. In the manufacturing apparatus 600, the film 110 drawn from a roll (not shown) is processed in each of the above parts while being conveyed intermittently. Each part will be described further below.

[0032] The elongated member joining means 610 joins an elongated member consisting of a tear strip 120, a strip-shaped base 130, and a zipper portion 140 along the width direction of the film 110 being conveyed in the longitudinal direction. The tear strip 120, the strip-shaped base 130, and the zipper portion 140 may be formed as a single elongated member by, for example, extrusion molding (including co-extrusion molding). In another example, the tear strip 120 may be formed separately from the strip-shaped base 130 and the zipper portion 140, and each may be joined to the film 110 by a separate joining means. Here, the elongated member is joined to the portion that will become the first film 111 after a folding process as described later.

[0033] Specifically, the long member joining means 610 includes a feeder 611 and sealing bars 612A and 612B. The feeder 611 feeds out a long member of a predetermined length and places it in a predetermined position on the film 110. The feeder 611 may also include a cutter (not shown) for cutting the long member to a predetermined length. Meanwhile, the sealing bars 612A and 612B sandwich the film 110 together with the placed long member and join them to the film 110 by, for example, heat sealing or ultrasonic sealing. Alternatively, an adhesive may be applied in advance between the long member and the film 110, and the sealing bars 612A and 612B may join the overlapping film 110 and the long member by sandwiching and pressing them together.

[0034] The tab-forming means 620 forms tabs by cuttings 151 that penetrate the film 110 and the elongated member joined to the film 110. Specifically, the tab-forming means 620 includes a cutter 621 and a support base 622. The cutter 621 has a planar shape corresponding to the cuttings 151. As described above, the elongated member is joined to the portion that will become the first film 111, but at this stage the film 110 has not yet been folded back, so the cuttings 151 that penetrate the film 110 and the elongated member do not penetrate the second film 112 after the bag-shaped container 100 is completed.

[0035] The notch-forming means 630 forms notches 121 in the film 110 and the elongated member joined to the film 110. Specifically, the notch-forming means 630 includes a cutter 631 and a support base 632. In this embodiment, the notch 121 penetrates the film 110 and the tear strip 120, but not the strip-shaped base 130, so the notch depth of the cutter 631 is adjusted to an amount corresponding to the total thickness of the film 110 and the tear strip 120. Although not shown, the sealing performance of the container body near the notch 121 may be improved by pressing the area including the notch 121 after the notch 121 has been formed.

[0036] The back seal forming means 640 forms the general shape of the container body consisting of the first film 111 and the second film 112 by winding both sides of the film 110 in the width direction to form a tube and forming a back seal portion 104. Specifically, the back seal forming means 640 includes a winding core 641, a conveyor belt 642, and a sealing device 643. The film 110 is wound around the winding core 641 and conveyed from top to bottom by the conveyor belt 642. The tubularly wound film 110 is folded back on both sides in the width direction corresponding to the sides 101A and 101B of the bag-shaped container 100, thereby forming the first film 111 and the second film 112 as described above. The sealing device 643 forms the back seal portion 104 by joining both ends of the wound film 110 in the width direction, for example, by heat sealing or ultrasonic sealing.

[0037] The top / bottom seal forming means 650 forms a top seal portion 102 and a bottom seal portion 103 on the film 110 which has been folded back on both sides in the width direction, and also forms a bag-shaped container 100 by cutting the film 110 in the width direction. Furthermore, the top / bottom seal forming means 650 forms the enclosed seal portion 160 as described above. As shown in the enlarged cross-sectional view of Figure 7, the top / bottom seal forming means 650 includes seal bars 651A, 651B, a cutter 652, a support base 653, and sealing devices 654A, 654B that form the enclosed seal portion 160.

[0038] The sealing bars 651A and 651B face each other on the upper and lower sides of the cutter 652, and their respective opposing portions form a top sealing portion 102 and a bottom sealing portion 103 by, for example, heat sealing or ultrasonic sealing. The cutter 652 and the support base 653 move closer together and further apart by moving together with the sealing bars 651A and 651B, cutting the film 110 in the width direction between the top sealing portion 102 and the bottom sealing portion 103 formed by the sealing bars 651A and 651B.

[0039] In the illustrated example, the core 641 of the back seal forming means 640 is hollow, and the filling device 601 is inserted into it from above. The filling device 601 discharges the contents in sync with the seal bars 651A and 651B in the top / bottom seal forming means 650 as they sandwich the film 110. This fills the space formed above the bottom seal portion 103 of the bag-shaped container 100 with the contents. Subsequently, when the seal bars 651A and 651B separate, the contents are transported downwards along with the film 110, passing over the seal bars 651A and 651B, and then the top seal portion 102 is formed, sealing the bag-shaped container 100.

[0040] The sealing devices 654A and 654B, in synchronization with the sealing bars 651A and 651B, sandwich the film 110 and form a surrounding seal portion 160 by, for example, heat sealing or ultrasonic sealing. The sealing bars of the sealing devices 654A and 654B have a planar shape corresponding to the surrounding seal portion 160, for example, as shown in Figure 5. Specifically, the sealing bar has a U-shaped planar shape that surrounds three sides of a predetermined area where a tab is formed by the notches 151, and at least one side of the planar shape has at least one protruding inner edge. Alternatively, the sealing bar may have a shape that is not U-shaped when including the portion that is not attached to the film 110, for example, a substantially rectangular planar shape that surrounds all four sides of the predetermined area.

[0041] The bag-shaped container 100 according to this embodiment can be manufactured by the process described above. Note that the above process is just one example, and various modifications are possible. For example, the tab forming means 620 and the notch forming means 630 may be arranged in the reverse order of the above example. Alternatively, the tab forming means 620 and the notch forming means 630 may be integrated, and the notches 151 and 121 may be formed almost simultaneously. In another example, the seal bars 651A, 651B included in the top / bottom seal forming means 650, the cutter 652 and the support base 653 may be separated, and the film 110 may be cut in the width direction after the top seal portion 102 and the bottom seal portion 103 have been formed.

[0042] In other examples, the sealing devices 654A and 654B may form the surrounding seal portion 160 before the top seal portion 102 and bottom seal portion 103 are formed by the sealing bars 651A and 651B. For example, by positioning the sealing devices 654A and 654B above the sealing bars 651A and 651B and forming the surrounding seal portion 160 before the bottom seal portion 103 located at the bottom of the bag-shaped container 100 is formed, it is possible to prevent the contents, which are filled in synchronously with the formation of the bottom seal portion 103, from adhering to the area inside the surrounding seal portion 160. It should be noted that the bag-shaped container 100 does not necessarily have to be manufactured while being filled with contents; for example, in the above manufacturing apparatus 600, the filling device 601 may be omitted to manufacture a bag-shaped container 100 that is not filled with contents.

[0043] In other examples, the tab-forming means 620 may be positioned after the sealing devices 654A and 654B that form the surrounding seal portion 160. In this case, the cutter 621 of the tab-forming means 620 is positioned on the first film 111 side, and the support base 622 is positioned on the second film 112 side. Since the notch 151 that forms the tab does not completely penetrate the second film 112, the depth of the cut by the cutter 621 is adjusted to an amount corresponding to the total thickness of the first film 111, the tear strip 120, and the strip-shaped base 130. By forming the notch 151 after the surrounding seal portion 160, deformation of the notch due to thermal shrinkage of the film when forming, for example, a heat seal or ultrasonic seal can be minimized.

[0044] Furthermore, the bag-shaped containers according to other embodiments of this embodiment, which will be described below, can be manufactured by combining the manufacturing process of the bag-shaped container 100 according to the first embodiment described above with the manufacturing process of other known bag-shaped containers, or by replacing a part of the manufacturing process of the bag-shaped container 100 with the manufacturing process of other bag-shaped containers. Therefore, the description of the manufacturing process will be omitted in the description of the other embodiments below.

[0045] (Second embodiment) Figure 8 is a plan view of a bag-shaped container according to a second embodiment of the present invention, and Figure 9 is an enlarged view of the surrounding seal portion of the bag-shaped container shown in Figure 8. In this embodiment, a back seal portion is not formed on the bag-shaped container 200; instead, a side seal portion 205 is formed on the side portion 101A. When such a side seal portion 205 is formed, the surrounding seal portion 160 together with the side seal portion 205 forms a joining region that surrounds all four sides of the tab 150. Therefore, in this embodiment, the seal bar forming the surrounding seal portion 160 includes a substantially rectangular planar shape that surrounds all four sides of a predetermined area where the tab is formed by the notch 151, and at least one side of the planar shape has an inner edge that includes at least one protrusion. In the illustrated example, the seal bar is integrally formed with the seal bar forming the side seal portion 205. Note that the configuration of this embodiment is the same as that of the first embodiment described above in respects other than those mentioned above, so redundant detailed explanations are omitted. The modifications described for the first embodiment are also applicable to this embodiment.

[0046] (Third embodiment) Figure 10 is a plan view of a bag-shaped container according to a third embodiment of the present invention, and Figure 11 is a cross-sectional view of the bag-shaped container shown in Figure 10, taken along line XI-XI. In this embodiment, the bag-shaped container 300 is a so-called gusset bag, and portions 311A ​​and 311B are formed at the sides 101A and 101B of the bag-shaped container 300, respectively, where the film 110 is folded inward into the container body. Accordingly, as shown in Figure 11, in this embodiment, the enclosed seal portion 160 joins the first film 111, the tear strip 120, the strip-shaped base portion 130, and the film forming the folded portion 311A ​​to each other. In other words, in the enclosed seal portion 160 of this embodiment, the film forming the folded portion 311A ​​corresponds to the second film 112 in the first embodiment described above. On the other hand, at the bottom of the bag-shaped container 300, a portion 312 is formed where a film different from the film 110 is folded inward into the container body.

[0047] Regarding the structure of the gusset bag, various known techniques are available, not limited to the examples above. For example, the folded portion on the side may be formed from a film other than the film 110. Also, as in the second embodiment described above, a side seal may be formed instead of a back seal. Since the structure of this embodiment is the same as that of the first embodiment described above in all other respects, redundant detailed explanations are omitted. The modifications described for the first embodiment are also applicable to this embodiment.

[0048] (Fourth embodiment) Figure 12 is a cross-sectional view of a bag-shaped container according to a fourth embodiment of the present invention. Figure 12 is a cross-sectional view of the portion corresponding to line III-III shown in Figure 1. In this embodiment, the bag-shaped container 400 does not include a zipper. In the illustrated example, the cross-section of the strip-shaped base 430 includes a recess 432 and protrusions 431 and 433 on both sides thereof, and the tear strip 120 is placed in the recess 432. A slit 434 is formed in the recess 432, and after the tear strip 120 tears the first film 111 while interfacially peeling away from the strip-shaped base 430 and forming an opening in the container body, access to the inside of the container body becomes possible through the slit 434. In this embodiment as well, the first film 111, the tear strip 120, the recess 432 of the strip-shaped base 430 and the second film 112 are joined to each other in the surrounding seal portion 160. Therefore, as with the first embodiment described above, the tab 150 side edge at the intersection of the surrounding seal portion 160 and the tear strip 120 is shaped so that it is not perpendicular to the longitudinal direction of the tear strip 120 at least partially, thereby enabling smooth separation between the tear strip 120 and the strip-shaped base portion 430. Since the configuration of this embodiment is the same as that of the first embodiment described above in all other respects, redundant detailed explanations are omitted. The modifications described for the first embodiment are also applicable to this embodiment.

[0049] Furthermore, the configuration without a zipper, as in the fourth embodiment, is used when resealing and reopening of the bag-shaped container after opening formation is not necessary. Such a configuration is not limited to the example of the fourth embodiment; for example, it may be a configuration in which the zipper portion 140 is omitted from the configuration of the first embodiment, as shown as a cross-sectional view in Figure 3.

[0050] (Fifth embodiment) Figure 13 is a plan view of a bag-shaped container according to a fifth embodiment of the present invention, and Figure 14 is a cross-sectional view of the bag-shaped container shown in Figure 13 along line XIV-XIV. In the illustrated example, the bag-shaped container 500 includes a film 110, a tear strip 120, a strip-shaped base 130, a zipper portion 140, and a protective member 170. A tab 150 is formed near one side 101A of the bag-shaped container 100, i.e., near one end in the longitudinal direction of the elongated member including the tear strip 120, the strip-shaped base 130, and the zipper portion 140. The protective member 170, which is joined to the area covering the tab 150, is also included in the elongated member.

[0051] The protective member 170 is joined from the strip base 130 side to the area covering the tab 150 formed by the cut 151 that penetrates the first film 111, the tear strip 120, and the strip base 130. As shown in the illustrated example, the protective member 170 may extend at least partially beyond the strip base 130 and be joined to the first film 111 as well. The protective member 170 seals the space leading to the cut in the tab 150 on the inside of the container body, improving the airtightness of the bag-shaped container 500 before it is opened using the tear strip 120. The protective member 170 is formed of the same material as the film 110 described above, for example. Of the materials described above, it is possible to select different materials for the protective member 170 and the film 110, but it is more preferable to select the same material for the protective member 170 and the film 110.

[0052] Furthermore, in the bag-shaped container 500, the airtightness of the bag-shaped container 500 before it is opened using the tear strip 120 can be improved by arranging the protective member 172 so as to cover the area where the notch 121 is formed on the opposite side of the tab 150 from the inside of the container body. Alternatively, the notch 121 may be formed to penetrate the first film 111 and the tear strip 120, but not to penetrate the strip-shaped base 130. In this case, since the space leading to the notch 121 does not reach the inside of the container body, the protective member 172 may not be necessary. Also, as described in the first embodiment, the notch 121 does not necessarily have to be formed.

[0053] As shown in Figure 14, the protective member 170 is joined to the strip-shaped base 130 at the surrounding seal portion 560. The surrounding seal portion 560 is a joining region surrounding the tab 150 and, similar to the surrounding seal portion described in the first embodiment above, includes an intersection that crosses the tear strip 120 and the strip-shaped base 130. At the surrounding seal portion 560, the first film 111, the tear strip 120, the strip-shaped base 130 and the protective member 170 are joined to each other, for example, by heat sealing or ultrasonic sealing. The tab 150 is formed in the non-joined region adjacent to the surrounding seal portion 560, that is, the region where the strip-shaped base 130 and the protective member 170 are not joined. By surrounding the tab 150 with the surrounding seal portion 560, the space communicating with the outside through the notch 151 of the tab 150 is spatially separated from other spaces within the container body separated by the surrounding seal portion 560 and the protective member 170, which are the joining areas. Therefore, even if the tab 150 is formed by the notch 151 that penetrates the first film 111, the sealing performance of the container body can be maintained.

[0054] At the intersection where the surrounding seal portion 560 crosses the tear strip 120 and the strip-shaped base portion 130, the edge of the surrounding seal portion 560 on the tab 150 side is shaped so that it is at least partially not perpendicular to the longitudinal direction of the tear strip 120. Specifically, the intersection of the surrounding seal portion 560 is configured in the same way as the example described with reference to Figure 5 for the first embodiment. This allows for smooth separation between the tear strip 120 and the strip-shaped base portion 130 when forming an opening in the container body using the tear strip 120. Note that, apart from the above, the configuration of this embodiment is the same as that of the first embodiment described above, so redundant detailed explanations are omitted. The modifications described for the first embodiment are also applicable to this embodiment. Furthermore, it is possible to combine the second, third, and fourth embodiments with this embodiment.

[0055] Figure 15 shows an example of the configuration of a film assembly according to a fifth embodiment of the present invention. The film assembly 550 according to this embodiment includes a film 110 before it is folded back at the sides 101A and 101B, and at least two elongated members attached to one side of the film 110, spaced apart from each other along the longitudinal direction of the film 110 wound on a roll. The elongated members include a tear strip 120, a strip-shaped base 130, a zipper portion 140, and a protective member 170. Tabs are formed on the elongated members by notches 151. Also, a surrounding seal portion 560 (see Figure 14), which is a joining area where the film 110, tear strip 120, strip-shaped base 130, and protective member 170 are joined to each other, is also formed. In order to form the container body by folding as described above, the width L1 of the film is greater than twice the length L2 of the elongated members.

[0056] Figure 16 shows the manufacturing process of a bag-shaped container using the film assembly shown in Figure 15. As described above, the film assembly 550 unwound from the roll has a long member attached to it, including a tear strip 120, a strip-shaped base 130, a zipper portion 140, and a protective member 170, so there is no need to attach these during the manufacturing of the bag-shaped container. The film assembly 550 is formed into a bag-shaped container by a back seal forming means 640 and a top / bottom seal forming means 650, similar to the example shown in Figure 6. In this embodiment, since the surrounding seal portion 560 is already formed in the film assembly 550 as described above, the top / bottom seal forming means 650 does not need to include a sealing device for forming the surrounding seal portion.

[0057] The manufacturing process for the bag-shaped container according to this embodiment is not limited to this example. For example, a process of attaching a long member to the film 110 during the manufacturing of the bag-shaped container may be performed, similar to the example shown in Figure 6. In this case, a tab is formed in the long member by cutting 151, and then the protective member 170 is joined to the long member by the surrounding seal portion 560. [Examples]

[0058] The following describes embodiments of the present invention. In Example 1, a projection was formed on the tab-side edge at the intersection where it intersects with the tear strip of the surrounding seal portion, as described above as an embodiment, and in Comparative Example 1, the tab-side edge at the intersection was made straight and no projection was formed. The maximum tensile strength (maximum tensile strength at opening) was measured from the time the tab was grasped and pulling was started until the tear strip passed through the intersection of the surrounding seal portion. The tensile strength was measured using an IMADA "Digital Force Gauge" at a pulling speed of 300 mm / min. In both Example 1 and Comparative Example 1, the tear strip was formed from random polypropylene, and the strip-shaped base was formed from low-density polyethylene. The results of the examples and comparative examples shown in Table 1 demonstrate that the maximum tensile strength at opening is significantly reduced by forming a projection on the edge of the joining region.

[0059] [Table 1]

[0060] Preferred embodiments of the present invention have been described in detail above with reference to the attached drawings, but the present invention is not limited to these examples. It will be obvious to those skilled in the art to which the present invention belongs that various modifications or alterations can be conceived within the scope of the technical idea described in the claims, and these will naturally also be understood to fall within the technical scope of the present invention. [Explanation of Symbols]

[0061] 100...Bag-shaped container, 101A, 101B...Side part, 102...Top seal part, 103...Bottom seal part, 104...Back seal part, 110...Film, 111...First film, 112...Second film, 120...Tear strip, 121...Notch, 130...Strip-shaped base part, 140...Zipper part, 141...First base part, 142...Second base part, 143A, 143B...Engaging part, 144A, 144B...Hook part, 150...Tab, 151...Notch, 160...Enclosing seal part, 161...Intersection part, 162...Protruding part, 170...Protective member, 550...Film assembly.

Claims

1. A container comprising a portion in which a first film constituting the container body, a tear strip, a strip-shaped base, and a second film constituting the container body are stacked in this order, A joining region is formed across the tear strip and the strip-shaped base in which the first film, the tear strip, the strip-shaped base, and the second film are joined to each other. In the non-joined region adjacent to the joined region, a tab is formed by a cut that penetrates at least the first film, the tear strip, and the strip-shaped base. The tab-side edge of the joining region is at least partially not perpendicular to the longitudinal direction of the tear strip, and the container includes at least one projection.

2. The container according to claim 1, wherein the protruding portion is mountain-shaped, trapezoidal, rectangular, or arc-shaped.

3. The container according to claim 1 or claim 2, wherein the width of the protruding portion is 0.3 mm or more.

4. The container according to claim 3, wherein the width of the protruding portion is 3 mm or less.

5. The container according to claim 1, wherein the protruding height of the protruding portion is 0.3 mm or more.

6. The container according to claim 5, wherein the protruding height of the protruding portion is 5 mm or less.

7. The container according to claim 1, wherein a plurality of protrusions are formed at the tab-side edge of the joining region, overlapping with the tear strip.

8. The container according to claim 7, wherein the width of the area in which the multiple protrusions are formed is greater than or equal to the width of the tear strip.

9. A first base formed following the aforementioned band-shaped base, A second base facing the first base and joined to the first film, First and second engaging portions that protrude from the first and second base portions respectively and are capable of engaging with each other The container according to claim 1, further comprising:

10. The container according to claim 1, wherein the first film and the second film are formed by folding a single film.

11. The container according to claim 1, wherein the joining region at least partially surrounds the tab.

12. The container according to claim 1, wherein the container body is in the shape of a bag.

13. A step of joining together a first film constituting the container body, a tear strip, a strip-shaped base, and a second film constituting the container body in this order, thereby forming a joining region that crosses the tear strip and the strip-shaped base, A step of forming a tab in a non-joined region adjacent to the joined region by making cuts that penetrate at least the first film, the tear strip, and the strip-shaped base. Includes, A method for manufacturing a container, wherein the tab-side edge of the joining region is at least partially not perpendicular to the longitudinal direction of the tear strip and includes at least one protrusion.

14. A means for joining together a first film constituting the container body, a tear strip, a strip-shaped base, and a second film constituting the container body in this order, thereby forming a joining region that crosses the tear strip and the strip-shaped base, In the non-joined region adjacent to the joined region, means for forming a tab by making cuts that penetrate at least the first film, the tear strip, and the strip-shaped base; Equipped with, A container manufacturing apparatus wherein the tab-side edge of the joining region is at least partially not perpendicular to the longitudinal direction of the tear strip and includes at least one projection.

15. A sealing bar used as a means for forming the joining region in the container manufacturing apparatus described in Claim 14, A sealing bar having a planar shape that encloses at least three sides of a predetermined area, wherein at least one side of the planar shape has an inner edge that includes at least one projection.

16. A container comprising a portion in which a first film constituting the container body, a tear strip, a strip-shaped base, and a second film constituting the container body are stacked in this order, The protective member is further joined from the strip-shaped base side to the area covering the tab formed by the cut through the first film, the tear strip, and the strip-shaped base, A joining region is formed across the tear strip and the strip-shaped base in which the first film, the tear strip, the strip-shaped base, and the protective member are joined to each other. The tab is formed in a non-jointed region adjacent to the jointed region, The tab-side edge of the joining region is at least partially not perpendicular to the longitudinal direction of the tear strip, and the container includes at least one projection.

17. The container body is bag-shaped, The width of the aforementioned protrusion is 0.3 mm or more and 3 mm or less. The container according to claim 16, wherein the protruding height of the protruding portion is 0.3 mm or more and 5 mm or less.

18. A first base formed following the aforementioned band-shaped base, A second base facing the first base and joined to the first film, First and second engaging portions that protrude from the first and second base portions respectively and are capable of engaging with each other The container according to claim 16 or claim 17, further comprising:

19. The device comprises a film and at least two elongated members attached to one surface of the film, spaced apart from each other along one direction of the film. The long member includes a tear strip, a strip-shaped base superimposed on the tear strip, and a protective member joined from the strip-shaped base side to an area covering a tab formed by cuts penetrating the film, the tear strip, and the strip-shaped base. The joining region in which the film, the tear strip, the strip-shaped base, and the protective member are joined to each other is formed across the tear strip and the strip-shaped base, The tab is formed in a non-jointed region adjacent to the jointed region, A film assembly in which the tab-side edge of the joining region is at least partially not perpendicular to the longitudinal direction of the tear strip and includes at least one projection.

20. The width of the protruding portion is 0.3 mm or more and 3 mm or less. The film assembly according to claim 19, wherein the protruding height of the protruding portion is 0.3 mm or more and 5 mm or less.

21. A first base formed following the aforementioned band-shaped base, A second base facing the first base and joined to the film, First and second engaging portions that protrude from the first and second base portions respectively and are capable of engaging with each other The film assembly according to claim 19 or claim 20, further comprising:

Images