Container opening tape, container with opening tape, and method for manufacturing container with opening tape

Abstract

To tear a container body more smoothly along a gap between a base strip piece and a belt-like member when opening the container body by not tearing a thin part, but precisely positioning two parts of a tape across a gap and joining them to the container body.SOLUTION: There is provided a tape comprising: a first thick part formed of a first resin composition containing polyolefin-based resin; a second thick part formed of a second resin composition containing polyolefin-based resin; and a first intermediate part formed between the first and second thick parts and joined to the first thick part in a boundary face peelable state.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention provides For opening containers tape, For opening Tape-attached containers and For opening This relates to a method for manufacturing a container with tape. [Background technology]

[0002] As a packaging material for packaging various items such as food, medicine, medical supplies, miscellaneous goods, etc., a zipper tape-equipped packaging bag is used, which has a pair of strip-shaped zipper tapes formed of male and female members that interlock with each other at the opening of the bag, and this interlocking state can be opened and closed freely. Such a zipper tape-equipped packaging bag is sealed by sealing the upper part of the zipper tape, and can be opened by tearing the film of the bag body using notches formed on both sides of the packaging bag as a starting point.

[0003] When opening a packaging bag with zipper tape in this way, the film near the zipper tape tears, making it difficult to grasp the bag body, and a technology for cutting the film of the bag body at a predetermined position has been desired. Patent Document 1 therefore discloses a technology in which a tear string is provided on a part of the zipper tape, and the film of the bag body is torn by pulling the tear string. Patent Document 2 also describes a zipper tape that is cut using a tearable resin to induce tearing in the tape portion of the zipper tape.

[0004] Furthermore, as an improvement over the technologies described in Patent Documents 1 and 2, Patent Document 3 describes a technology in which a base strip of a zipper tape is torn at its thin-walled portion to separate it into a strip-shaped member, and the base strip and the separated strip are positioned with a predetermined gap between them and then joined to the base film of the bag body. With this technology, the base strip of the zipper tape and the strip-shaped member can be joined to the base film with high precision, and when opening the bag, an opening can be easily formed by tearing the base film along the gap between the zipper tape and the strip-shaped member. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Laid-Open No. 2004-276925 [Patent Document 2] Japanese Patent Application Laid-Open No. 2004-244027 [Patent Document 3] Japanese Patent Application Publication No. 2017-136832 Summary of the Invention [Problem to be solved by the invention]

[0006] However, in the technology of Patent Document 3, after the base strip is torn, the thinned portions remain as protrusions on the base strip and the strip-shaped member, respectively. Because these protrusions are thinner than the base strip and the strip-shaped member, they remain as unjoined portions even when these members are joined to the base film of the bag body, which can detract from the appearance.

[0007] Therefore, the present invention is to bond two portions of the tape to the container body with a gap between them, without relying on tearing the thin portion, so that the container body can be torn more smoothly along the gap between the base strip and the belt-shaped member when opening. For opening containers tape, For opening Tape-attached containers and For opening The object is to provide a method for manufacturing a container with tape. [Means for solving the problem]

[0008] [1] A tape comprising: a first thick portion formed of a first resin composition containing a polyolefin-based resin; a second thick portion formed of a second resin composition containing a polyolefin-based resin; and a first intermediate portion formed between the first and second thick portions and bonded to the first thick portion in an interfacially peelable manner. [2] The tape according to [1], wherein the peel strength between the first thick portion and the first intermediate portion is 16 N / 15 mm or less. [3] The tape according to [1] or [2], further comprising a rib formed on at least one of the first and second thick portions. [4] The tape according to any one of [1] to [3], further comprising a bonding layer formed between the second thick portion and the first intermediate portion. [5] The tape described in [4], further comprising a sealing layer formed on at least one surface of the first and second thick portions, wherein the bonding layer is formed from the same resin composition as the sealing layer. [6] A tape described in any one of [1] to [3], wherein the main component of the first and second resin compositions is polypropylene, and the first intermediate portion is formed from a resin composition whose main component is polyethylene. [7] A tubular member formed between the second thick-walled portion and the first intermediate portion, having a density of 915 kg / m 3 The tape according to [6], further comprising an adhesive layer formed from the following resin composition containing polyethylene as a main component: [8] The tape described in any one of [1] to [3], further comprising a sealing layer formed on at least one surface of the first and second thick portions and the first intermediate portion. [9] The tape according to [8], wherein the sealing layer formed in the first thick portion and the sealing layer formed in the first intermediate portion are spaced apart from each other.

[10] The tape according to [8] or [9], further comprising a bonding layer formed between the second thick portion and the first intermediate portion, the bonding layer being formed from the same resin composition as the sealing layer.

[11] A container with tape comprising: a container body having at least a first region and a second region that face each other; and a tape according to any one of [1] to

[10] , in which one of the first or second thick-walled portions is joined to both the first region and the second region, and the other is joined to the first region but not to the second region, and there is a separation between the first thick-walled portion and the first intermediate portion.

[12] The tape according to any one of [1] to

[10] , comprising: a first member including first and second thick portions and a first intermediate portion; and a second member configured to at least partially face the first member, including a third thick portion formed of a first resin composition, a fourth thick portion formed of a second resin composition, and a second intermediate portion formed between the third and fourth thick portions and interfacially peelably bonded to the third thick portion.

[13] The tape described in

[12] , wherein the first member further includes a first base strip continuous with the second thick portion and a first engagement portion protruding from the first base strip in the thickness direction of the first member, and the second member further includes a second base strip continuous with the fourth thick portion and a second engagement portion protruding from the second base strip in the thickness direction of the second member and engageable with the first engagement portion, and the first intermediate portion and the second intermediate portion are positioned so as to face each other when the first engagement portion and the second engagement portion are engaged with each other.

[14] The tape according to

[13] , wherein the second thickened portion is formed thicker than the first base strip, and the fourth thickened portion is formed thicker than the second base strip.

[15] A tape-attached container comprising: a container body having at least a first region and a second region facing each other; and a tape according to any one of

[12] to

[14] , in which a first member is joined to the first region, a second member is joined to the second region, and the first thick portion and the first intermediate portion are separated from each other, and the third thick portion and the second intermediate portion are separated from each other.

[16] A container with tape according to

[11] or

[15] , wherein the container body is bag-shaped.

[17] A method for manufacturing a tape-attached container including a tape having a first thick portion formed of a first resin composition containing a polyolefin-based resin, a second thick portion formed of a second resin composition containing a polyolefin-based resin, and a first intermediate portion formed between the first and second thick portions, and a container body having at least a first region and a second region facing each other, the method comprising the steps of: separating the first thick portion from the first intermediate portion by interfacial peeling; and joining the first thick portion and the second thick portion to the first region while maintaining the distance between the first thick portion and the second thick portion. [Effects of the Invention]

[0009] According to the above-described configuration, the two thick-walled portions are separated by interfacial peeling via the intermediate portion. For example, by separating the two thick-walled portions by interfacial peeling rather than by tearing the thin-walled portions, the thin-walled portions do not remain unjoined after tearing, which would impair the appearance, and the two thick-walled portions can be easily and reliably joined to the container body with a gap and accurately positioned. [Brief explanation of the drawings]

[0010] [Figure 1] 1 is a plan view of a tape-attached bag according to a first embodiment of the present invention. [Figure 2] FIG. 2 is a cross-sectional view taken along line II-II in FIG. [Figure 3] 1 is a cross-sectional view showing an example of a tape according to a first embodiment of the present invention. [Figure 4] 3A to 3C are diagrams illustrating an example of a method for manufacturing a tape-attached bag according to the first embodiment of the present invention. [Figure 5] FIG. 3 is a cross-sectional view showing another example of the tape-attached bag according to the first embodiment of the present invention. [Figure 6] FIG. 3 is a cross-sectional view showing another example of the tape according to the first embodiment of the present invention. [Figure 7] FIG. 10 is a plan view of a bag with a zipper tape according to a second embodiment of the present invention. [Figure 8] FIG. 8 is a cross-sectional view taken along line VIII-VIII in FIG. 7. [Figure 9] FIG. 4 is a cross-sectional view showing an example of a zipper tape according to a second embodiment of the present invention. [Figure 10] FIG. 4 is a cross-sectional view showing another example of the zipper tape according to the second embodiment of the present invention. [Figure 11] FIG. 10 is a cross-sectional view showing an example of a zipper tape according to a third embodiment of the present invention. [Figure 12] FIG. 13 is an enlarged view of the vicinity of the middle portion of the zipper tape shown in FIG. DETAILED DESCRIPTION OF THE INVENTION

[0011] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In this specification and drawings, components having substantially the same functional configurations are designated by the same reference numerals, and redundant description will be omitted.

[0012] In this specification, the main component of the resin composition forming each layer of the laminate refers to the resin component with the highest content among the resin compositions forming that layer. Therefore, the resin composition may contain other components in addition to the main component. The main component can be identified, for example, by IR analysis. In this specification, the content of the components of the resin composition forming each layer of the laminate is expressed in mass % relative to the total resin composition forming that layer, unless otherwise specified.

[0013] (First embodiment) Fig. 1 is a plan view of a tape-attached bag according to a first embodiment of the present invention, and Fig. 2 is a cross-sectional view taken along line II-II in Fig. 1. As shown, tape-attached bag 100 includes film 110 that forms the bag body and has first and second regions 111A and 111B that face each other, and tape 120 that is at least partially joined to first and second regions 111A and 111B of film 110. A storage space is formed between first region 111A and second region 111B.

[0014] The film 110 is, 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 a multi-layer film, the surface substrate may be biaxially oriented polypropylene (OPP), biaxially oriented polyethylene terephthalate (OPET), or biaxially oriented nylon (ONy). These are not limited to fossil fuel-derived resins, but may also be environmentally friendly bioplastics, or a mixture of fossil fuel-derived resins and bioplastics. Examples of bioplastics that may be used include biopolyethylene and biopolypropylene. The film 110 may also include a layer of a metal material such as aluminum, or an inorganic material.

[0015] In this embodiment, first region 111A and second region 111B are formed by overlapping two sheets of film 110 and joining them together at top seal portion 112, bottom seal portion 113, and side seal portion 114. However, in another embodiment, first region 111A and second region 111B may be formed by folding back a single sheet of film 110 at a portion corresponding to side seal portion 114. A portion where the film is folded inward, a so-called gusset, may be formed at a portion corresponding to bottom seal portion 113 or side seal portion 114. In this case, the gusset may be formed from the same film as first region 111A or second region 111B, or from a different film. Tape-attached bag 100 may also be a stand-up pouch that can be placed upright by forming a gusset at the bottom.

[0016] 2, the tape 120 includes a first member 120A and a second member 120B that are elongated and opposed to each other. The first member 120A includes thick portions 121A and 121B, each of which is joined to the first region 111A of the film 110 by a sealing layer 123. An intermediate portion 122A is present between the thick portions 121A and 121B, and when the first member 120A is joined to the first region 111A, the thick portion 121A is separated from the intermediate portion 122A. As will be described later, when the tape 120 is supplied, the intermediate portion 122A is joined to the thick portion 121A in an interfacially peelable manner, and during the manufacturing process of the tape-attached bag 100, the thick portion 121A is separated from the intermediate portion 122A by interfacial peeling.

[0017] On the other hand, second member 120B includes thick portions 121C and 121D, each of which is joined to second region 111B of film 110 by seal layer 123. Intermediate portion 122B exists between thick portion 121C and thick portion 121D, and thick portion 121C is separated from intermediate portion 122B when second member 120B is joined to second region 111B. As with first member 120A, intermediate portion 122B is joined to thick portion 121C in an interfacially peelable manner when tape 120 is supplied, and thick portion 121C is separated from intermediate portion 122B by interfacial peeling during the manufacturing process of tape-attached bag 100.

[0018] In the illustrated example, no sealing layer 123 is formed between the intermediate portions 122A, 122B and the film 110, but depending on the combination of resin compositions that form the intermediate portions 122A, 122B and the film 110, the intermediate portions 122A, 122B may also be joined to the first region 111A or the second region 111B of the film 110 by the sealing layer 123.

[0019] The raw material for sealing layer 123 preferably contains, for example, linear low-density polyethylene obtained using a metallocene catalyst (metallocene linear low-density polyethylene), and more preferably contains linear low-density polyethylene obtained using a metallocene catalyst and a propylene-α-olefin copolymer obtained using a metallocene catalyst. The raw material for sealing layer 123 is more preferably a resin composition that contains, for example, 10% to 50% by mass of the following resin (A) and 50% to 90% by mass of the following resin (B), and that has a maximum peak at a scattering angle 2θ of 14° in wide-angle X-ray scattering by X-ray diffraction. Resin (A): Density 900kg / m 3 The following refers to a propylene-α-olefin copolymer obtained using a metallocene catalyst with a melt flow rate (MFR) of 1.0 g / 10 min or more and 20 g / 10 min or less and a melting point of 100°C or less. Resin (B): Density 900kg / m 3 Linear low-density polyethylene obtained using a metallocene catalyst with an MFR of 1.0 g / 10 min or more and 20 g / 10 min or less and a melting point of 80°C or more and 100°C or less.

[0020] FIG. 3 is a cross-sectional view showing an example of a tape according to the first embodiment of the present invention. In the example described above with reference to FIGS. 1 and 2, the tape 120 attached to the film 110 is supplied independently before being attached to the film 110. In this case, as shown, the thick portion 121A and the intermediate portion 122A are bonded together in an interfacially peelable manner, and the thick portion 121C and the intermediate portion 122B are bonded together in a similar manner. In this specification, "interfacially peelable" means that the peel strength between the members is 16 N / 15 mm or less. Therefore, the peel strength between the thick portion 121A and the intermediate portion 122A and between the thick portion 121C and the intermediate portion 122B is 16 N / 15 mm or less. To facilitate interfacial peeling, the peel strength between the thick portion 121A and the intermediate portion 122A and between the thick portion 121C and the intermediate portion 122B is preferably 13 N / 15 mm or less, more preferably 10 N / 15 mm or less. The lower limit of the peel strength is not particularly limited, but is, for example, 0.01 N / 15 mm or more. The peel strength in this specification can be measured by a method conforming to the trouser tear test (JIS K7128-1). Specifically, a zipper tape cut to a width of 150 mm is cut with a 75 mm long slit between the thick part and the middle part, and set in a tensile tester. This is pulled vertically at 200 mm / min, and the 20 mm after the start of tearing and the 5 mm before the end of tearing are excluded, and the average tear force for the remaining 50 mm is calculated. The obtained average tear force is divided by the thickness of the middle part and converted to a 15 mm width to obtain the peel strength.

[0021] The thicknesses of thick portions 121A, 121B, 121C, and 121D are determined from the viewpoints of reinforcing film 110 by joining them, serving as guide ribs that guide tearing of film 110 along the gaps between the thick portions, improving ease of opening, and preventing unintended peeling between the intermediate portion and the thick portions. Specifically, the thicknesses of thick portions 121A, 121B, 121C, and 121D are, for example, 0.1 mm or more, preferably 0.15 mm or more, and more preferably 0.2 mm or more. The upper limit of the thickness of the thick portions is not particularly limited, but is set to 0.7 mm from the viewpoint of ease of crushing side seal portion 114 during manufacturing. Note that thick portions 121A, 121B, 121C, and 121D do not need to be the same thickness, and the thickness of each of thick portions 121A, 121B, 121C, and 121D does not need to be uniform. For example, as in the illustrated example, thick portions 121A and 121C may have ribs 124 extending in the longitudinal direction of tape 120 and protruding from one side in the thickness direction (inside the bag body). By forming ribs 124, it is possible to detect abnormalities, such as when tape 120 is bonded to film 110 in an inverted state. When tape 120 is inverted, ribs 124 face film 110, reducing the contact area between thick portions 121A and 121C and film 110. This makes it easy to detect abnormalities by the appearance of the tape after bonding. Similarly, thick portions 121B and 121D may have ribs extending in the longitudinal direction of tape 120 and protruding from one side in the thickness direction (inside the bag body). Note that, for the base strip of the zipper portion described below, ribs may not be formed because the engaging portion protruding from the base strip functions in the same way as the rib.

[0022] Furthermore, the thickness of the intermediate portions 122A and 122B is, for example, approximately the same as that of the thick portions 121A, 121B, 121C, and 121D. This ensures that the intermediate portions 122A and 122B, along with the thick portions 121A, 121B, 121C, and 121D, are reliably bonded to the film 110, preventing them from remaining unbonded after tearing. The thick portions 121A, 121B, 121C, and 121D do not need to be exactly the same thickness as the intermediate portions 122A and 122B; for example, a difference of about ±20% relative to the thickness of the thick portions is acceptable, with a difference of ±10% or less being preferable, and a difference of ±5% or less being more preferable. Furthermore, since the respective thick portions do not need to be the same thickness, the thickness of the intermediate portions 122A and 122B need only be within the above-mentioned range relative to any adjacent thick portions. By setting the thickness of the intermediate portions 122A, 122B within this range, the manufacturing process for the tape-attached bags described below can be carried out stably, and it is also expected to have the effect of preventing unintentional peeling of the tape 120 during packaging or transportation.

[0023] The widthwise dimension of intermediate portions 122A, 122B of tape 120 is, for example, 5 μm or more, preferably 10 μm or more, and more preferably 50 μm or more. By setting the dimension within this range, the bonding strength can be stabilized. Furthermore, the widthwise dimension of intermediate portions 122A, 122B of tape 120 is not particularly limited, but is, for example, 2 mm or less.

[0024] The tape 120 described above is formed by extrusion molding of a resin composition containing, for example, a polyolefin resin. More specifically, the tape 120 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 are not limited to fossil fuel-derived resins; they may be environmentally friendly bioplastics or mixtures of fossil fuel-derived resins and bioplastics. Preferred bioplastics include biopolyethylene and biopolypropylene. Known additives, such as stabilizers, antioxidants, lubricants, antistatic agents, and colorants, may be added to the material of the tape 120 as needed.

[0025] In this embodiment, the interface peeling between the thick portion 121A and the intermediate portion 122A as described above, To prevent interfacial peeling between thick portion 121C and middle portion 122B, middle portions 122A and 122B and thick portions 121A and 121C are formed from a combination of resin materials that are poorly compatible with each other. Specifically, for example, thick portions 121A and 121C may each be formed from a resin composition primarily composed of polypropylene, and middle portions 122A and 122B may be formed from a resin composition primarily composed of polyethylene, more specifically, LDPE. Thick portions 121B and 121D may also be formed from a resin composition primarily composed of polypropylene.

[0026] For example, when thick portions 121A and 121B, and thick portions 121C and 121D are each formed of the same resin composition, bonding layer 125 is formed between intermediate portion 122A and thick portion 121B but not between intermediate portion 122A and thick portion 121B, and similarly bonding layer 125 is formed between intermediate portion 122B and thick portion 121D but not between intermediate portion 122B and thick portion 121D, thereby selectively causing delamination between thick portion 121A and intermediate portion 122A and between thick portion 121C and intermediate portion 122B. When each thick portion is formed of a resin composition mainly composed of polypropylene, bonding layer 125 may have a density of, for example, 915 kg / m 3 The adhesive layer may be formed of a resin composition containing the following polyethylene as a main component: The density of the polyethylene in the adhesive layer is preferably 910 kg / m 3 Less than or equal to 905 kg / m 3 The bonding layer 125 may be formed from the same resin composition as the sealing layer 123, for example, metallocene linear low density polyethylene (m-LLDPE).

[0027] The raw material of the bonding layer 125 preferably contains the same resin composition as that of the sealing layer 123, for example, linear low-density polyethylene obtained using a metallocene catalyst (metallocene linear low-density polyethylene), and more preferably contains linear low-density polyethylene obtained using a metallocene catalyst and a propylene-α-olefin copolymer obtained using a metallocene catalyst. The raw material of the bonding layer 125 is more preferably a resin composition that contains, for example, 10% by mass to 50% by mass of the following resin (A) and 50% by mass to 90% by mass of the following resin (B), and that has a maximum peak at a scattering angle 2θ of 14° in wide-angle X-ray scattering by X-ray diffraction. Resin (A): Density 900kg / m 3 The following refers to a propylene-α-olefin copolymer obtained using a metallocene catalyst with a melt flow rate (MFR) of 1.0 g / 10 min or more and 20 g / 10 min or less and a melting point of 100°C or less. Resin (B): Density 900kg / m3 Linear low-density polyethylene obtained using a metallocene catalyst with an MFR of 1.0 g / 10 min or more and 20 g / 10 min or less and a melting point of 80°C or more and 100°C or less.

[0028] The dimension of the bonding layer 125 in the width direction of the tape 120 is, for example, 5 μm or more, preferably 10 μm or more, and more preferably 15 μm or more. The dimension of the bonding layer 125 is, for example, 2.0 mm or less, preferably 1.5 mm or less, and more preferably 1.0 mm or less. By setting the dimension within this range, the bonding strength is increased and unintended peeling can be prevented. Note that the bonding layer 125 is not necessarily formed with a uniform dimension in the width direction of the tape 120, but even in that case, it is sufficient that the minimum and maximum dimensions fall within the above ranges.

[0029] FIG. 4 is a diagram showing an example of a method for manufacturing a tape-attached bag according to the first embodiment of the present invention. The tape-attached bag 100 according to this embodiment is manufactured by joining the tape 120 to the film 110 and shaping the film 110 into the shape of a bag body including the first region 111A and the second region 111B. However, FIG. 4 shows a step of separating the thick portion 121A of the first member 120A from the middle portion 122A and the thick portion 121B before joining the tape 120 to the film 110. This step is performed by a supplying means 510, a separating means 520, a guiding means 530, and a joining means 540. The second member 120B of the tape 120 is not shown in the figure.

[0030] The supplying means 510 continuously supplies the first member 120A of the tape 120, in which the thick portion 121A and the middle portion 122A are not separated. The separating means 520 separates the thick portion 121A from the middle portion 122A and the thick portion 121B by causing interfacial peeling between the thick portion 121A and the middle portion 122A of the first member 120A supplied by the supplying means 510. In the illustrated example, the separating means 520 is a separator 521 that promotes separation of the thick portion 121A from the middle portion 122A, which is subjected to tension in a direction away from the middle portion 122A by the guiding means 530 described below. Because separation occurs by interfacial peeling, the separating means 520 does not necessarily require a blade-like member that tears the resin material. In this embodiment, the thick portion is not separated by tearing the thin portion, so the thin portion remains unbonded after tearing, which does not detract from the appearance.

[0031] The guide means 530 guides the thick portion 121A separated by the separating means 520 so as to separate it from the intermediate portion 122A and the thick portion 121B in the width direction of the first member 120A. In the illustrated example, the guide means 530 is a rod-shaped member 531 having an annular portion 531A at its tip. The annular portion 531A is positioned so as to be spaced a predetermined distance from the intermediate portion 122A and the thick portion 121B, which are conveyed linearly even after separation. The separated thick portion 121B is positioned so as to pass through the annular portion 531A, thereby maintaining the distance between the thick portion 121A and the thick portion 121B. The distance between the thick portion 121A and the thick portion 121B is set so as to prevent the thick portion 121A and the intermediate portion 122A from being fused together again when the thick portion 121A and the thick portion 121B are joined to the film 110 by, for example, the joining means 540.

[0032] The joining means 540 joins the thick portions 121A and 121B to the film 110. In the illustrated example, the joining means 540 is a seal bar 541 for heat sealing. The seal bar 541 applies heat to an area including the thick portion 121B and the thick portion 121A guided away from the thick portion 121B, thereby joining each portion to the film 110. Positioning means 542 for positioning the thick portion 121A at the entrance side of the seal bar 541 may be further provided. The positioning means 542 is, for example, a pair of columnar members 542A and 542B. By arranging the thick portion 121A guided by the guide means 530 so that it passes between the pair of columnar members 542A and 542B, the thick portion 121A entering the seal bar 541 can be correctly positioned. Thereafter, the tape-attached bag 100 is manufactured through a bag-making process (not shown).

[0033] In the tape-attached bag 100 according to this embodiment, gaps are formed between thick portions 121A and 121B of the tape 120 joined to the film 110 of the bag body, and between thick portions 121C and 121D. In these gaps, the thick portions are not joined to the film 110, and the tear strength of the film 110 is relatively weaker than in the portions where the thick portions on both sides are joined. Therefore, when a user attempts to tear the film 110 starting from the notch 115 (see FIG. 1) formed in the side seal portion 114 at the longitudinal end of the tape 120, the tear is guided along the gap between the thick portions, and a linear opening can be formed in the bag body along the tape 120.

[0034] Furthermore, in this embodiment, during the production of tape-attached bag 100, thick portions 121A and 121B in first member 120A are separated by interfacial peeling via intermediate portion 122A, and thick portions 121C and 121D in second member 120B are separated by interfacial peeling via intermediate portion 122B. For example, by separating the thick portions by interfacial peeling rather than by tearing the thin portions, the thin portions do not remain as unjoined portions, which would impair the appearance, and the two thick portions can be easily and reliably joined to film 110 with a gap between them and accurately positioned.

[0035] 5 and 6 are cross-sectional views showing other examples of the tape-attached bag and the tape according to the first embodiment of the present invention. As shown in FIG. 5, a tape-attached bag may be constructed by bonding tape 120 (first member 120A) alone to film 110. Specifically, in the example of FIG. 5, thick portion 121A of tape 120 is bonded to both first region 111A and second region 111B of film 110, while thick portion 121B is bonded to second region 111B but not to first region 111A. Even with this configuration, an opening can be formed in the bag body by tearing first region 111A and second region 111B of film 110 along the gap between thick portions 121A and 121B. In this case, as shown in FIG. 6, tape 120 is constructed only by first member 120A, and sealing layer 123 is formed on both sides of thick portion 121A and one side of thick portion 121B.

[0036] (Second embodiment) Fig. 7 is a plan view of a zipper tape bag according to a second embodiment of the present invention, and Fig. 8 is a cross-sectional view taken along line VIII-VIII in Fig. 7. As shown, zipper tape bag 200 includes film 110 similar to that of the first embodiment described above, and zipper tape 220 joined to first region 111A and second region 111B of film 110, respectively. Note that the configuration of this embodiment is similar to that of the first embodiment described above, except for the configuration of base strips 226A, 226B and engagement portions 227A, 227B, which are zipper portions described below, and therefore a detailed description thereof will be omitted.

[0037] 8, zipper tape 220 includes first and second members 220A and 220B, which are elongated and opposed to each other. First member 220A includes thickened portions 121A and 121B, an intermediate portion 122A, a base strip 226A that constitutes the zipper portion, and an engaging portion 227A. Second member 220B includes thickened portions 121C and 121D, an intermediate portion 122B, a base strip 226B that constitutes the zipper portion, and an engaging portion 227B. Base strip 226A is formed continuous with thickened portion 121B in the width direction of first member 220A, and base strip 226B is formed continuous with thickened portion 121D in the width direction of second member 220B. The thickened portions 121A, 121B and the base strip 226A are joined to the first region 111A of the film 110 by the sealing layer 123. The thickened portions 121C, 121D and the base strip 226B are joined to the second region 111B of the film 110 by the sealing layer 123. As in the first embodiment described above, when joined to the film 110, there is a separation between the thickened portion 121A and the middle portion 122A, and between the thickened portion 121C and the middle portion 122B.

[0038] In the illustrated example, the thickened portions 121A, 121B are formed thicker than the base strip 226A, and the thickened portions 121C, 121D are formed thicker than the base strip 226B. The engagement portion 227A protrudes from the base strip 226A in the thickness direction of the first member 220A, and the engagement portion 227B protrudes from the base strip 226B in the thickness direction of the second member 220B. The base strips 226A, 226B are joined to the first region 111A and the second region 111B of the film 110, respectively, and face each other, and the engagement portions 227A, 227B are engageable with each other.

[0039] FIG. 9 is a cross-sectional view showing an example of a zipper tape according to a second embodiment of the present invention. The zipper tape 220, which was attached to the film 110 in the example described above with reference to FIGS. 7 and 8, is supplied independently before being attached to the film 110. In this case, as shown, the thick portion 121A and the intermediate portion 122A are joined in an interfacially peelable manner, and the thick portion 121C and the intermediate portion 122B are joined in a similar manner. As described above, the peel strength between the thick portion 121A and the intermediate portion 122A, and between the thick portion 121C and the intermediate portion 122B, which are joined in an interfacially peelable manner, is 16 N / 15 mm or less. To facilitate interfacial peeling, the peel strength between the thick portion 121A and the intermediate portion 122A and between the thick portion 121C and the intermediate portion 122B is preferably 13 N / 15 mm or less, and more preferably 10 N / 15 mm or less. The lower limit of the peel strength is not particularly limited, but is, for example, 0.01 N / 15 mm or more. The method for measuring the peel strength is as described above.

[0040] The zipper tape 220, like the tape 120 of the first embodiment, is formed by extrusion molding of a resin composition containing, for example, a polyolefin resin. Known additives, such as stabilizers, antioxidants, lubricants, antistatic agents, or colorants, may be added to the material as needed. The material of the zipper tape 220 is not limited to fossil fuel-derived resins, but may also be environmentally friendly bioplastics or a mixture of fossil fuel-derived resins and bioplastics. Examples of bioplastics that may be used include biopolyethylene and biopolypropylene.

[0041] In the zipper tape 220, the shapes of the engaging portions 227A, 227B are not limited to the illustrated example, and may be any of various known zipper shapes, such as a combination of claw, hook, or knob shapes. In the illustrated example, the engaging portion 227A is male and the engaging portion 227B is female, but they may be reversed. In addition, in the illustrated example, one pair of engaging portions is provided, but multiple pairs of engaging portions may be provided.

[0042] In the illustrated example, intermediate portions 122A and 122B are respectively joined to thickened portions 121B and 121D that are continuous with base strips 226A and 226B of the zipper portion, but intermediate portions 122A and 122B may alternatively be joined to thickened portions 121A and 121C that are opposite base strips 226A and 226B. In this case as well, thickened portion 121B and intermediate portion 122A, and thickened portion 121D and intermediate portion 122B are separated by delamination, respectively, achieving the same effect as in the above example.

[0043] In this embodiment, as in the first embodiment, during the production of zipper tape-attached bag 200, thick portions 121A and 121B in first member 220A are separated by interfacial peeling via intermediate portion 122A, and thick portions 121C and 121D in second member 220B are separated by interfacial peeling via intermediate portion 122B. For example, by separating the thick portions by interfacial peeling rather than by tearing the thin portions, the thin portions after tearing do not remain as unjoined portions, which would impair the appearance, and the two thick portions can be easily and reliably joined to film 110 with a gap between them with high precision.

[0044] Fig. 10 is a cross-sectional view showing another example of a zipper tape according to the second embodiment of the present invention. In the example shown in Fig. 10, base strips 226C, 226D of the zipper portion are formed with the same thickness as thickened portions 121B, 121D in each of the first member 220A and the second member 220B. In this embodiment, thickened portions 121B, 121D may be formed continuously with base strips 226C, 226D and have no distinct shape, as in the example of Fig. 10, or may be formed thicker than base strips 226A, 226B, as in the example of Fig. 9.

[0045] (Third embodiment) 11 is a cross-sectional view showing an example of a zipper tape according to a third embodiment of the present invention. In a zipper tape 320 according to this embodiment, seal layers 323A, 323B, 323C, and 323D are formed on the thick portions 121A and 121B, thick portions 121C and 121D, and intermediate portions 122A and 122B. More specifically, the thick portions 121A and 121B, the intermediate portion 122A, and the base strip 226A are joined to the first region 111A of the film 110 by the seal layers 323A and 323B, and the thick portions 121C and 121D, the intermediate portion 122B, and the base strip 226B are joined to the second region 111B of the film 110 by the seal layers 323C and 323D. Other configurations are similar to those of the second embodiment, and therefore, a detailed description thereof will be omitted.

[0046] 12 is an enlarged view of the vicinity of the intermediate portion of the zipper tape shown in FIG. 11. In this embodiment, the seal layers 323B and 323D formed in the intermediate portions 122A and 122B are separated from the seal layers 323A and 323C formed in the thick portions 121A and 121C. That is, the seal layers 323B and 323D are laminated on the portions of the intermediate portions 122A and 122B facing the thick portions 121B and 121D, but no seal layer is laminated on the portions facing the thick portions 121A and 121C, resulting in a single-layer structure of the intermediate portions 122A and 122B. The space between the seal layers 323A and 323C and the seal layers 323B and 323D may be filled with the single-layer portion of the intermediate portions 122A and 122B as shown in the example, or may be a gap. The distance separating sealing layers 323A, 323C from sealing layers 323B, 323D is not particularly limited as long as it is a distance that prevents the sealing layers from bonding together when bonded to film 110 or the like, but is, for example, 1 mm or less, preferably 0.5 mm or less, and more preferably 0.2 mm or less.

[0047] As already described in the first embodiment, depending on the combination of resin compositions forming the intermediate portions 122A, 122B and the film 110, the intermediate portions 122A, 122B may also be joined to the first region 111A or the second region 111B of the film 110 by a sealing layer. As in the example described in the first embodiment, the sealing layers 323A, 323B, 323C, and 323D may be formed from the same resin composition as the joining layer 125. The raw materials for the sealing layers 323A, 323B, 323C, and 323D preferably contain, for example, linear low-density polyethylene obtained using a metallocene catalyst (metallocene linear low-density polyethylene), and more preferably contain linear low-density polyethylene obtained using a metallocene catalyst and a propylene-α-olefin copolymer obtained using a metallocene catalyst. It is further preferable that the raw materials of the sealing layers 323A, 323B, 323C, and 323D contain, for example, 10% by mass or more and 50% by mass or less of the following resin (A) and 50% by mass or more and 90% by mass or less of the following resin (B), and that the wide-angle X-ray scattering measured by X-ray diffraction has a maximum peak at a scattering angle 2θ of 14°. Resin (A): Density 900kg / m 3 The following refers to a propylene-α-olefin copolymer obtained using a metallocene catalyst with a melt flow rate (MFR) of 1.0 g / 10 min or more and 20 g / 10 min or less and a melting point of 100°C or less. Resin (B): Density 900kg / m 3 Linear low-density polyethylene obtained using a metallocene catalyst with an MFR of 1.0 g / 10 min or more and 20 g / 10 min or less and a melting point of 80°C or more and 100°C or less.

[0048] According to the configuration of the third embodiment as described above, when, for example, a bonding layer is required for bonding the intermediate portions 122A, 122B to the film 110 due to a combination of resin compositions, the intermediate portions 122A, 122B can be reliably bonded to the film 110, while separation due to interfacial peeling can easily occur between the intermediate portions 122A, 122B and the thick portions 121A, 121C.

[0049] The configuration of the seal layer in the third embodiment is not limited to the zipper tape according to the second embodiment, but can also be applied to the tape according to the first embodiment. Moreover, the modified examples described in the first and second embodiments can also be applied to the third embodiment.

[0050] Although the above describes an example in which the container body is a bag-shaped bag body, a tape-attached container or a zipper tape-attached container may be provided by joining tape or zipper tape to a container body other than a bag-shaped container body.

[0051] Although the preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings, the present invention is not limited to these examples. It is clear that a person skilled in the art to which the present invention pertains can conceive of various modifications or alterations within the scope of the technical ideas described in the claims, and it is understood that these also naturally fall within the technical scope of the present invention. [Explanation of symbols]

[0052] 100...bag with tape, 110...film, 111A...first region, 111B...second region, 112...top seal portion, 113...bottom seal portion, 114...side seal portion, 115...notch, 120...tape, 120A...first member, 120B...second member, 121A, 121B, 121C, 121D...thick portion, 122A, 122B...intermediate portion, 123...seal layer, 124...rib, 125...bonding layer, 200...bag with zipper tape, 220, 32 0...zipper tape, 220A...first member, 220B...second member, 226A, 226B, 226C, 226D...base strip, 227A, 227B...engagement portion, 323A, 323B, 323C, 323D...sealing layer, 510...supply means, 520...separation means, 521...separator, 530...guiding means, 531...rod-shaped member, 531A...annular portion, 540...joining means, 541...seal bar, 542...positioning means, 542A, 542B...columnar members.

Claims

1. a first thick portion formed of a first resin composition containing a polyolefin-based resin; a second thick portion formed of a second resin composition containing a polyolefin-based resin; a first intermediate portion formed between the first and second thick portions and bonded to the first thick portion in an interfacially peelable manner; Equipped with A container opening tape configured such that when the first thick-walled portion and the second thick-walled portion are separated, selective delamination occurs between the first thick-walled portion and the first intermediate portion.

2. 2. The container opening tape according to claim 1, wherein a peel strength between the first thick portion and the first intermediate portion is 16 N / 15 mm or less.

3. The container opening tape according to claim 1 or 2, further comprising a rib formed on at least one of the first and second thick portions.

4. a bonding layer formed between the second thick portion and the first intermediate portion; The container opening tape according to claim 1 , wherein the bonding layer is not formed between the first thick portion and the first intermediate portion.

5. a sealing layer formed on at least one surface of the first and second thick portions; The container opening tape according to claim 4 , wherein the joining layer is formed from the same resin composition as the sealing layer.

6. the first and second resin compositions each contain polypropylene as a main component; 4. The container opening tape according to claim 1, wherein the first intermediate portion is formed from a resin composition containing polyethylene as a main component.

7. formed between the second thick portion and the first intermediate portion and having a density of 915 kg / m ３ The container opening tape according to claim 6, further comprising an adhesive layer formed from the following resin composition containing polyethylene as a main component:

8. The container opening tape according to claim 1 , further comprising a sealing layer formed on at least one surface of the first and second thick portions and the first intermediate portion.

9. The container opening tape according to claim 8 , wherein the sealing layer formed on the first thick portion and the sealing layer formed on the first intermediate portion are spaced apart from each other.

10. a bonding layer formed between the second thick portion and the first intermediate portion; the bonding layer is formed from the same resin composition as the sealing layer, 10. The container opening tape according to claim 8 or claim 9, wherein the bonding layer is not formed between the first thick portion and the first intermediate portion.

11. a container body having at least a first region and a second region opposed to each other; the container opening tape according to any one of claims 1 to 10, wherein one of the first and second thick portions is joined to both the first region and the second region, and the other is joined to the first region but not to the second region, and the first thick portion and the first intermediate portion are separated from each other; A container with a tear-off tape.

12. a first member including the first and second thick portions and the first intermediate portion; a second member configured to at least partially face the first member, the second member including a third thick portion formed of the first resin composition, a fourth thick portion formed of the second resin composition, and a second intermediate portion formed between the third and fourth thick portions and bonded to the third thick portion in an interfacially peelable manner; The container opening tape according to any one of claims 1 to 10, comprising:

13. the first member further includes a first base strip continuous with the second thick portion, and a first engagement portion protruding from the first base strip in a thickness direction of the first member; the second member further includes a second base strip continuous with the fourth thick portion, and a second engaging portion protruding from the second base strip in a thickness direction of the second member and engageable with the first engaging portion; The container opening tape according to claim 12, wherein the first intermediate portion and the second intermediate portion are positioned so as to face each other when the first engaging portion and the second engaging portion are engaged with each other.

14. 14. The container opening tape of claim 13, wherein the second thickened portion is thicker than the first base strip, and the fourth thickened portion is thicker than the second base strip.

15. a container body having at least a first region and a second region opposed to each other; the container opening tape according to any one of claims 12 to 14, wherein the first member is joined to the first region, the second member is joined to the second region, and the first thick portion and the first intermediate portion are separated from each other, and the third thick portion and the second intermediate portion are separated from each other; A container with a tear-off tape.

16. The container with a tear tape according to claim 11 or 15, wherein the container body is bag-shaped.

17. A method for manufacturing a container with a tearing tape, the method comprising: a container opening tape comprising: a first thick portion formed of a first resin composition containing a polyolefin-based resin; a second thick portion formed of a second resin composition containing a polyolefin-based resin; and a first intermediate portion formed between the first and second thick portions; wherein the container opening tape is configured so that, when the first thick portion and the second thick portion are separated, delamination selectively occurs between the first thick portion and the first intermediate portion; and a container body having at least a first region and a second region facing each other, separating the first thick portion and the first intermediate portion by interfacial peeling; bonding the first thick portion and the second thick portion to the first region while maintaining a distance between the first thick portion and the second thick portion; A method for manufacturing a container with a tear tape, comprising:

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