Container, film with tape, tape member, method for manufacturing film with tape, and method for manufacturing container

Abstract

To form a tearing end point while securing the sealability of a container without using an additional member.SOLUTION: This container comprises: a film that forms a container body; a tearing strip directly or indirectly joined to the film; and a tape member including a base laminated on a side opposite to the film with respect to the tearing strip. A thin part is formed through pressing near one end of the tearing strip.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a container, a taped film, a tape member, a method for manufacturing a taped film, and a method for manufacturing a container. [Background technology]

[0002] Conventionally, various bags in which zipper tape is joined to a bag body made of a film have been known as bag-shaped containers for packaging medicines, food, etc. For example, as described in Patent Document 1, such a bag with zipper tape includes a bag body formed by attaching a sheet of film to the back and joining it in a direction perpendicular to the back-attaching direction, and a reclosable zipper is joined to the front wall of the bag body, of the front and rear walls facing each other, and a pull-out plug or thread for opening is attached to the front wall adjacent to the zipper.

[0003] In the technology described in the above Patent Document 1, a punching mechanism is used to make multiple holes in the front wall to form a pull-out plug, and these holes may reduce the sealing performance of the bag. It is also disclosed that a thread is provided on the inner surface of the front wall for opening, but no specific method is disclosed for exposing the end of the thread to the outside to form a tab. Normally, in order to make the end of the thread function as a tab, it is considered to form a hole in the front wall through which the thread passes through the film of the bag body, but in this case too, the hole may reduce the sealing performance of the bag.

[0004] In view of this, Patent Documents 2 and 3 propose a bag, a film, and a method for manufacturing the bag that can provide high sealing performance. Specifically, the bag includes a bag body that forms a storage space, a tape member that is provided on one side of the film that constitutes the bag body and includes a base and a tear strip, and a tab whose outer edge is formed by a cut line that penetrates the base, the tear strip, and the film. By providing a protective member so as to cover the area where the tab is formed from the inside of the bag, the sealing performance of the bag can be maintained even when the tab is formed for opening.

[0005] The techniques described in the above Patent Documents 2 and 3 disclose forming a cut in the film and the tear strip near the end of the tear strip opposite the tab. By forming such a cut, the end point of the tear strip can be easily formed. The cut may extend through to the base, but in that case, as described in Patent Document 3, a protective member is provided at the cut portion to maintain the hermeticity of the container. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Special Publication No. 11-510461 [Patent Document 2] JP 2018-188196 A [Patent Document 3] JP 2022-65719 A Summary of the Invention [Problem to be solved by the invention]

[0007] However, it is not always easy to form a cut that does not penetrate the base with an accurate depth, and for example, if a cut penetrates the base due to an error during manufacturing, the airtightness of the bag will decrease. Also, while the airtightness of the bag can be more reliably guaranteed by providing a protective member, there is room for improvement in that it leads to an increase in the amount of resin used and the manufacturing process.

[0008] Therefore, the present invention aims to provide a container, a taped film, a tape member, a method for manufacturing a taped film, and a method for manufacturing a container that are capable of forming an end point for tearing without using additional members and while ensuring the airtightness of the container. [Means for solving the problem]

[0009] [1] A container comprising a film forming a container body, a tear strip joined directly or indirectly to the film, and a tape member including a base laminated on the opposite side of the film to the tear strip, in which a thin-walled portion is formed by pressing near one end of the tear strip. [2] The container described in [1], wherein the thin-walled portion is formed within a range of 20% of the total length from one end of the tear strip. [3] The container described in [1] or [2], wherein the thin-walled portion is formed by pressing from the film side. [4] The container described in [3], wherein an indentation is formed in the film at a position corresponding to the thin-walled portion. [5] A container as described in any one of [1] to [4], wherein the tear strip is continuous on both sides of the thin-walled portion. [6] A container as described in any one of [1] to [5], wherein a tab for opening is formed at a position different from the thin-walled portion of the tear strip. [7] The container described in any one of [1] to [6], wherein the base includes a first base and a second base joined to the film, the second base being wider than the first base, the first base and the second base are formed with a first engagement portion and a second engagement portion, respectively, the first engagement portion and the second engagement portion are engageable with each other, and the tear strip is laminated between the second base and the film. [8] A tape-attached film comprising: a long film; a tear strip joined to the film and arranged so that the width direction of the film is the longitudinal direction; and a tape member including a base laminated on the opposite side of the film to the tear strip, wherein a thin-walled portion is formed by pressing near one end of the tear strip. [9] A tape member comprising a tear strip that can be joined to a film, and a base that is laminated to the tear strip on the opposite side to the film, wherein a thinned portion is formed by pressing near one end of the tear strip.

[10] A method for manufacturing a film with tape, comprising: a first step of joining a tape member including a tear strip and a base laminated to the tear strip to the film such that the base is on the opposite side of the film to the tear strip; and a second step of forming a thin-walled portion in the film and the tear strip near one end of the tear strip by pressing from the film side after the first step.

[11] A method for manufacturing a film with tape, comprising: a first step of forming a thin-walled portion in a tape member including a ripped strip and a base laminated to the ripped strip by pressing the vicinity of one end of the ripped strip from the side opposite the base; and a second step of joining the tape member to the film after the first step so that the base is on the side opposite the film to the ripped strip.

[12] A method for manufacturing a container, comprising the first and second steps of the method for manufacturing a tape-attached film described in

[10] or

[11] , and a third step of forming a container body from the film. Effect of the Invention

[0010] According to the above-mentioned configuration, the end point of the tearing strip for forming an opening in the container is formed by the thin-walled portion, so that the end point of the tearing can be formed while ensuring the hermeticity of the container without forming a cut that does not penetrate the base or providing a protective member. [Brief description of the drawings]

[0011] [Figure 1] FIG. 2 is a plan view of a bag-shaped container according to an embodiment of the present invention. [Diagram 2] 2 is a diagram showing the configuration of a thin-walled portion of the bag-shaped container shown in FIG. 1. [Diagram 3] 1. FIG. 4 is a diagram showing another example of the configuration of the thin-walled portion of the bag-shaped container shown in FIG. [Figure 4] 3A to 3C are diagrams illustrating an example of a process for forming the thin-walled portion shown in FIG. 2. [Diagram 5] 4A to 4C are diagrams illustrating an example of a process for forming the thin-walled portion shown in FIG. 3. [Figure 6] 2A to 2C are diagrams showing examples of configurations of tape members in the bag-shaped container shown in FIG. 1. [Figure 7] 1. FIG. 4 is a diagram showing another example of the configuration of the tape member in the bag-shaped container shown in FIG. [Figure 8] 1. FIG. 4 is a diagram showing still another configuration example of the tape member in the bag-shaped container shown in FIG. [Figure 9] 1 is a diagram showing a tape-attached film according to an embodiment of the present invention; [Figure 10] FIG. 11 is a plan view showing another example of a bag-shaped container according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In this specification and the drawings, components having substantially the same functional configurations are designated by the same reference numerals, and redundant explanations will be omitted.

[0013] 1 is a plan view of a pouch-shaped container according to an embodiment of the present invention. In the illustrated example, the pouch-shaped container 100 includes a film 110 forming a container body including a first surface 111A and a second surface 111B facing each other, and a tape member 120 joined to the first surface 111A of the film 110. The tape member 120 includes a base portion 121 and a tear strip 122, and a thin-walled portion 131 (described later) is formed near one end of the tear strip 122. A tab 141 for opening is formed near the other end of the tear strip 122, and a protective member 142 for covering the tab 141 is arranged.

[0014] The film 110 is composed of, for example, a single-layer or multi-layer thermoplastic resin film. Specifically, the thermoplastic resin may be low-density polyethylene (LDPE), linear low-density polyethylene (LLDPE), or polypropylene (PP). PP may be homopolypropylene (HPP), random polypropylene (RPP), or block polypropylene (BPP). When the film 110 is composed of a multi-layer film, biaxially oriented polypropylene (OPP), biaxially oriented polyethylene terephthalate (OPET), or biaxially oriented nylon (ONy) may be used for the surface substrate. The film constituting the film 110 may also include a layer of a metal material such as aluminum, or a layer of an inorganic material. A resin film containing any amount of bioplastic such as biopolyethylene may also be used.

[0015] In this embodiment, the first surface 111A and the second surface 111B are formed by folding back a long film 110 from both sides in the width direction as in the example described below and joining both overlapping ends in the width direction at a seal portion 112. Sealed portions 113 and 114 are formed at the upper and lower ends of the container body, respectively. Note that, for example, in the case where the contents are filled after the bag-shaped container 100 is completed, at least one of the sealed portions 113 and 114 may not be formed.

[0016] In the tape member 120, the tear strip 122 is joined to the first side 111A of the film 110, and the base 121 is laminated on the opposite side of the tear strip to the first side 111A of the film 110. When the tear strip 122 is pulled from the tab 141, the tear strip 122 tears the first side 111A of the film 110 while peeling away from the base 121, forming an opening in the bag-like container 100. The thinned portion 131 forms the end point of the tear by the tear strip 122. In the illustrated example, the tab 141 is a cut formed in the first side 111A of the film 110, the tear strip 122 and the base 121, and a protective member 142 is arranged to prevent the cut from reducing the sealing performance of the bag-like container 100. In addition, the tape member 120 may have a base 121 including a pair of opposing portions, and an engaging portion may be formed on each of the portions to form a zipper tape.

[0017] In the tape member 120 as described above, the base 121 is formed by extrusion molding of, for example, a polyolefin resin. More specifically, the base 121 may be formed of low density polyethylene (LDPE), linear low density polyethylene (LLDPE), or polypropylene (PP). PP may be homopolypropylene (HPP), random polypropylene (RPP), or block polypropylene (BPP). These may be environmentally friendly bioplastics, or a mixture of a fossil fuel-derived resin and a biomass plastic such as biopolyethylene may be used. Also, the base 121 may be formed by extrusion molding of biodegradable resins, such as polylactic acid (PLA), polybutylene succinate (PBS), poly(butylene adipate / terephthalate) (PBAT), polycaprolactone (PCL), poly(caprolactone / butylene succinate) (PCLBS), poly(butylene succinate / adipate) (PBSA), poly(butylene succinate / carbonate) (PEC), poly(ethylene terephthalate / succinate) (PETS), poly(tetramethylene adipate / terephthalate) (PTMAT), polyethylene succinate (PES), polyvinyl alcohol (PVA-H), polyglycolic acid (PGA), and poly(hydroxybutyrate / hydroxyhexanoate) (PHBH), in consideration of the environment. These may be biodegradable resins derived from biomass. If necessary, known additives such as stabilizers, antioxidants, lubricants, antistatic agents, or colorants may be added to the material of the base 121.

[0018] On the other hand, the tear strip 122 is formed by extrusion molding of, for example, a polyolefin resin, in the same manner as the base 121. By forming the tear strip 122 from a resin that has low compatibility with the resin forming the base 121, it is possible to cause interfacial peeling at the joining surface between the base 121 and the tear strip 122. For this purpose, for example, one of the base 121 or the tear strip 122 may be formed from a low-density polyethylene resin, and the other from a random polypropylene resin. Specifically, the combinations include low density polyethylene (LDPE) / random polypropylene (RPP), linear low density polyethylene (LLDPE) / RPP (including m-LL), LDPE / homopolypropylene (HPP), LLDPE / HPP (including m-LL), LDPE / polystyrene (PS), LLDPE / PS (including m-LL), 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, or PS / Ny. When a biodegradable resin is used for the base 121, it is preferable that the tear strip 122 is also made of a biodegradable resin.

[0019] 2 and 3 are diagrams showing the configuration of the thin-walled portion of the bag-shaped container shown in FIG. 1, and are cross-sectional views taken along lines II-II and III-III in FIG. 1. The second surface 111B of the film 110 is not shown. In both examples, the tear strip 122 has thin-walled portions 131A and 131B (collectively referred to as thin-walled portion 131) formed by pressing. The fact that the thin-walled portion 131 is formed by pressing can be recognized, for example, by the fact that the tear strip 122 is continuous on both sides of the thin-walled portion 131 even though it is stretched. Alternatively, the fact that the thin-walled portion 131 is formed by pressing can be recognized by the fact that the extruded resin is accumulated on both sides of the thin-walled portion 131.

[0020] 2, as described below, thin portion 131A is formed after bonding of the tape member to the film, and therefore a pressure mark is formed on first surface 111A of film 110 at a position corresponding to thin portion 131A. This pressure mark is observed, for example, as a portion where first surface 111A is bent along the concave cross section of thin portion 131A.

[0021] 3, thin portion 131B is formed before the tape member is joined to the film, so no impression is formed on first surface 111A of film 110 at a position corresponding to thin portion 131B, and a gap is formed between first surface 111A and the concave portion of thin portion 131B. Note that even in this case, first surface 111A may bend at a position corresponding to thin portion 131B due to, for example, air in the gap shrinking after the tape member is joined to the film.

[0022] By making the thickness of the tear strip 122 in the thin portion 131, for example, 0.25 mm or less, the tear strip 122 that has been pulled while tearing the first surface 111A of the film 110 can be broken to form an end point of the tear. From the viewpoint of easily breaking the tear strip 122, the thickness of the tear strip 122 in the thin portion 131 is preferably 0.23 mm or less, more preferably 0.20 mm or less. Since the tear strip 122 is peeled off from the base portion 121 as described above, the thin portion 131 does not have to be formed on the base portion 121.

[0023] On the other hand, by leaving the combined portion of the tear strip 122 and the base 121 in the thin-walled portion 131, i.e., by making the thickness greater than 0 mm, the airtightness of the bag-like container 100 can be maintained without providing a protective member in the thin-walled portion 131. From this viewpoint, the combined portion of the tear strip 122 and the base 121 in the thin-walled portion 131 has a thickness of preferably 0.01 mm or more, more preferably 0.02 mm or more. Note that the thickness of the tear strip 122 in the thin-walled portion 131 may be 0 mm, since the airtightness can be maintained as long as the thickness of the base 121 remains.

[0024] 4 and 5 are diagrams showing an example of the process of forming the thin-walled portion shown in FIG. 2 and FIG. 3, respectively. In the example shown in FIG. 4, after the tape member is bonded to the film, the thin-walled portion 131A is formed by pressing the pressing element 201A from the film 110 side. In the example shown in FIG. 5, before the tape member is bonded to the film, the thin-walled portion 131B is formed by pressing the tear strip 122 from the side opposite the base 121 using the pressing element 201B. The pressing elements 201A and 201B have a cross-sectional shape such as a V-shape, a U-shape, or a wedge shape. By forming the pressing elements 201A and 201B in such a shape, the force can be concentrated on a part of the tear strip 122 to easily form the thin-walled portion. The pressing elements 201A and 201B are made of metal, for example, and the thin-walled portion may be formed while softening the resin by heating or applying ultrasonic vibration.

[0025] Figures 6 to 8 are diagrams showing examples of the configuration of the tape member in the bag-like container shown in Figure 1. As the tape member 120 including the base 121 and the tear strip 122, various known configurations can be adopted, as exemplified below.

[0026] In the example shown in FIG. 6, two opposing bases 121A and 121B are both joined to the first surface 111A of the film 110. The base 121B is wider than the base 121A. The bases 121A and 121B are respectively formed with engagement portions 123A and 123B, which are engageable with each other. In this case, the tape member 120 constitutes a pair of zipper tapes. The tear strip 122 is laminated between the base 121B and the first surface 111A of the film 110 and is joined to the first surface 111A. As in the example shown in FIG. 7, the tear strip 122 may be laminated between the base 121A and the base 121B joined to the first surface 111A. In this case, the tear strip 122 is indirectly joined to the first surface 111A. As shown by engaging portions 123C and 123D in Figures 6 and 7, two or more pairs of engaging portions may be formed. Although engaging portion 123A is shown as a male type, engaging portion 123B is shown as a female type, and engaging portions 123C and 123D are shown as hook-shaped engaging portions, the male and female may be reversed, and the shapes of the engaging portions of various known zipper tapes can be adopted without being limited to the male-female type or hook-shaped engaging portions.

[0027] In the example shown in Fig. 8, the two parts 121C, 121D of the base 121, which are separated by a slit, are joined to the first surface 111A of the film 110. The tear strip 122 is placed in a recess formed on the first surface 111A side of the base 121 and joined to the first surface 111A. In this case, at least one of the two parts 121C, 121D of the base 121 may be interposed between the tear strip 122 and the first surface 111A, so that the tear strip 122 is indirectly joined to the first surface 111A. In either case, when the first surface 111A is torn by the tear strip 122, an opening can be formed in the bag-like container 100 through the slit between the two parts 121C, 121D of the base 121.

[0028] FIG. 9 is a diagram showing a tape-attached film according to an embodiment of the present invention. The tape-attached film 101 shown in FIG. 9 is a material for manufacturing a bag-shaped container 100 as described with reference to FIG. 1, for example. As shown in the figure, the tape-attached film 101 includes a long film 110 wound in a roll shape, and a tape member 120 arranged so that the width direction of the film 110 is the longitudinal direction and joined to the film 110. Although not shown in FIG. 9, the tape member 120 is arranged so that a tear strip 122 is joined to the film 110 and a base portion 121 is laminated on the opposite side of the film 110 with respect to the tear strip 122. A thin-walled portion 131 is formed by pressing near one end of the tape member 120 including the tear strip 122, and a tab 141 is formed near the other end, and a protective member 142 is arranged thereon.

[0029] The tape-attached film 101 as described above is folded and overlapped near both ends of the tape member 120, and cut along the width direction of the film 110, i.e., along the longitudinal direction of the tape member 120, whereby the first surface 111A and the second surface 111B of the container body are formed by the film 110, and the bag-like container 100 as shown in Fig. 1 is manufactured. As described with reference to Figs. 4 and 5, the thin-walled portion 131 may be formed before the tape member 120 is joined to the film 110 in manufacturing the tape-attached film 101, or may be formed after the tape member 120 is joined to the film 110.

[0030] FIG. 10 is a plan view showing another example of a bag-shaped container according to an embodiment of the present invention. The bag-shaped container 100A of the example shown in FIG. 10 is different from the example of FIG. 1 in that an enclosing seal portion 143 is formed around the tab 141 and no protective member is arranged. In this example, the enclosing seal portion 143 separates the area of ​​the tab 141 from other areas inside the container, thereby preventing the container from losing its sealing ability due to the incision of the tab 141. Thus, in the embodiment of the present invention, the configuration other than the thin portion formed near one end of the tear strip, specifically, the configuration related to the tab for opening as described above, is not particularly limited, and various known configurations can be adopted. For example, an opening may be formed in the container by pulling the tear strip to both sides from two tabs formed near the center of the tear strip. In this case, a thin portion may also be formed near the other end of the tear strip. The area near the end of the torn strip refers to, for example, an area within 20% of the total length of the torn strip from the end of the torn strip, from the viewpoint of ease of use of the bag-shaped container. This area is preferably within 15%, and more preferably within 10%. There is no particular lower limit, and it is more than 0%. [Explanation of symbols]

[0031] 100, 100A... bag-shaped container, 101... film with tape, 110... film, 111A... first surface, 111B... second surface, 112, 113, 114... sealing portion, 120... tape member, 121... base, 122... tear strip, 131, 131A, 131B... thin-walled portion, 141... tab, 142... protective member, 143... surrounding seal portion, 201A, 201B... pressure element.

Claims

1. a tape member including a film forming a container body, a tear strip directly or indirectly joined to the film, and a base laminated on the tear strip on the opposite side of the film, A container in which a thin-walled portion is formed by pressing near one end of the tear strip.

2. 2. The container according to claim 1, wherein the thin-walled portion is formed within a range of 20% of the total length from one end of the tear strip.

3. The container according to claim 1 , wherein the thin-walled portion is formed by pressing from the film side.

4. The container according to claim 3 , wherein an indentation is formed in the film at a position corresponding to the thin-walled portion.

5. 2. The container of claim 1, wherein the tear strip is continuous on both sides of the thinned portion.

6. 2. The container of claim 1, wherein the tear strip has a tab formed thereon for opening at a location different from the thinned portion.

7. the base includes a first base and a second base joined to the film, the second base being wider than the first base; a first engaging portion and a second engaging portion are formed on the first base portion and the second base portion, respectively, and the first engaging portion and the second engaging portion are engageable with each other; 10. The container of claim 1, wherein the tear strip is laminated between the second base and the film.

8. a tape member including a long film, a tear strip joined to the film and arranged so that the width direction of the film is a longitudinal direction, and a base portion laminated on the tear strip on the opposite side of the film, A tape-attached film in which a thinned portion is formed by pressing near one end of the tear strip.

9. A tape member comprising a tear strip bondable to a film, and a base laminated to the tear strip on an opposite side of the film, A tape member in which a thinned portion is formed by pressing near one end of the tear strip.

10. a first step of joining a tape member including a tear strip and a base portion laminated to the tear strip to the film such that the base portion is on the opposite side of the film from the tear strip; a second step of forming a thinned portion in the film and the tear strip near one end of the film by pressing the film from the film side after the first step; A method for producing a tape-attached film, comprising:

11. A tape member including a tearable strip and a base portion laminated on the tearable strip, the tape member comprising: a first step of pressing a portion near one end of the tearable strip from an opposite side to the base portion to form a thin portion in the tearable strip; After the first step, the tape member is attached to the film so that the base is attached to the tear strip. a second step of bonding the film to the opposite side of the film; A method for producing a tape-attached film, comprising:

12. The first step and the second step in the method for producing a tape-attached film according to claim 10 or 11; a third step of forming a container body from the film; A method for manufacturing a container comprising:

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