Peelable lids for beverage containers

Abstract

To provide a new peelable lid material for a beverage container capable of easily forming a mouth, that exhibits sufficient resistance against dropping in a state of subjecting a container comprising a content to heat-sealing.SOLUTION: As shown in Fig.1, a peelable lid material 100 for a beverage container of the present invention is constituted of a laminate 100a. A face of an outer layer 102 on an easily peelable layer 104 side and a face of an inner layer 106 on the easily peelable layer 104 side are directly laminated onto the easily peelable layer 104, respectively. The peelable lid material has a body part 110 and an opening tab part 120, and has an inner layer half cutline 112 for one mouth formation. Thus, when the outer layer 102 is peeled from the inner layer 106 by pinching the laminate 100a in the opening tab part 120, the inner layer 106 is removed together with the outer layer 102 in a part of the body part 110, and the mouth opened to an outer peripheral side of the peelable lid material 100 is formed.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a peelable lid for a beverage container. [Background technology]

[0002] Lidded containers for beverages sold at convenience stores and the like are known to have a drinking spout that can be formed by peeling off a portion of the lid. Various embodiments of such lidded containers have been proposed.

[0003] Patent Document 1 discloses a beverage container comprising a container body having an opening and a lid that seals the container body so as to cover the opening. The lid is made of a laminated film including a base layer, a barrier layer, a buffer layer, and a multilayer sealant layer, and the multilayer sealant layer has an easy-peel laminate structure that allows for internal cohesive peeling or interlayer peeling. A half-cut slit is formed from the multilayer sealant layer at least partway through the buffer layer so that a drinking spout is formed in the lid by the cohesive peeling or interlayer peeling. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent Publication No. 2021-59373 Summary of the Invention [Problem to be solved by the invention]

[0005] When peeling is performed by cohesive peeling or interlayer peeling within the multi-layer sealant layer as in Patent Document 1, the intended peeling may not be achieved. In such cases, sufficient bag-breaking strength is not obtained, and the lidded container may break when dropped with its contents inside.

[0006] Therefore, the present invention provides a novel peelable lid material for beverage containers that has sufficient resistance to being dropped when heat-sealed to a container containing contents, and that allows for easy formation of a drinking spout. [Means for solving the problem]

[0007] The present inventors have conducted extensive research and found that the above problems can be solved by the following means, and have completed the present invention. That is, the present invention is as follows: <Aspect 1> A peelable lid material for a beverage container, The laminate is composed of an outer layer, an easily peelable layer, an inner layer, and a heat seal layer in this order, and the surface of the outer layer facing the easily peelable layer and the surface of the inner layer facing the easily peelable layer are directly laminated to the easily peelable layer, respectively; a body portion and a tear tab portion; The opening tab has a depth from the inner layer side to the easily peelable layer, and has one inner layer half-cut line for forming a drinking spout, so that when the laminate having the outer layer, the easily peelable layer, the inner layer, and the heat seal layer is pinched in the tear tab portion and the outer layer is peeled from the inner layer, the inner layer is removed together with the outer layer in a part of the main body portion, and a drinking spout that is open to the outer periphery side of the peelable lid material is formed. Peelable lid material. <Aspect 2> The lid material according to Aspect 1, wherein when the outer layer is peeled from the inner layer, the outer layer and the easily peelable layer are configured to peel from the inner layer at the interface between the inner layer and the easily peelable layer. <Embodiment 3> The lid material according to embodiment 2, wherein the surface of the inner layer in contact with the easily peelable layer is made of an untreated surface of a polyester resin or polyamide resin film. <Embodiment 4> The lid material according to embodiment 3, wherein the surface of the outer layer in contact with the easily peelable layer is a surface-treated surface of a polyester resin or polyamide resin film. <Embodiment 5> A lid material described in any one of embodiments 1 to 4, wherein the drinking spout forming inner layer half-cut line exists so that the drinking spout includes the center portion of the main body of the peelable lid material. <Aspect 6> A lid material described in Aspect 5, in which the inner layer half-cut line for forming the drinking spout is present so that the width of the drinking spout at the outer edge of the peelable lid material is narrower than the width of the drinking spout at the center of gravity side of the main body portion of the peelable lid material. <Aspect 7> The tear tab portion is located on the outer periphery of the peelable lid material on a side that does not include the portion corresponding to the drinking spout, and a peel trigger inner layer half-cut line is further provided between the tear tab portion and the main body portion, As a result, when the laminate having the outer layer, the easily peelable layer, the inner layer, and the heat seal layer in the tear tab portion is pinched and the outer layer is peeled from the inner layer, the inner layer of the tear tab portion and the inner layer forming the drinking spout are removed as separate parts. The lid material according to any one of the first to sixth embodiments. <Aspect 8> A lid material described in Aspect 7, in which the opening tab portion is located on the opposite side of the drinking spout based on the center of gravity of the main body portion of the peelable lid material. <Aspect 9> The tear tab is located on the same side of the drinking spout as the center of gravity of the main body of the peelable lid, and there is no inner layer half-cut line for a peel trigger between the tear tab and the main body. As a result, when the laminate having the outer layer, the easily peelable layer, the inner layer, and the heat seal layer in the tear tab portion is pinched and the outer layer is peeled from the inner layer, the inner layer of the tear tab portion and the inner layer forming the drinking spout are removed as a continuous portion. The lid material according to any one of the first to sixth embodiments. <Embodiment 10> The lid material according to any one of embodiments 1 to 9, and Container having a storage section and a flange section and The main body of the lid material is heat-sealed to the flange of the container. Container with lid. <Embodiment 11> A lidded container according to embodiment 10, further comprising contents stored in the storage section of the container. [Effects of the Invention]

[0008] According to the present invention, a novel peelable lid material for beverage containers can be provided which has sufficient resistance to falling when heat-sealed to a container containing contents, and which allows for easy formation of a drinking spout. [Brief explanation of the drawings]

[0009] [Figure 1] Fig. 1(a) is a top view of a lidded container according to a first embodiment of the present invention, and Fig. 1(b) is a side cross-sectional view of the lidded container according to the first embodiment of the present invention taken along line Ib-Ib in Fig. 1(a). [Figure 2] Figure 2(a) is a side cross-sectional view of the lidded container of the first embodiment of the present invention before the outer layer is peeled from the inner layer, and Figure 2(b) is a side cross-sectional view of the lidded container of the first embodiment of the present invention after the outer layer is peeled from the inner layer. [Figure 3] Figure 3(a) is a top view of a lidded container according to a second embodiment of the present invention, and Figure 3(b) is a side cross-sectional view of the lidded container according to the second embodiment of the present invention taken along line IIIb-IIIb in Figure 3(a). [Figure 4] Figure 4(a) is a side cross-sectional view of the lidded container of the second embodiment of the present invention before the outer layer is peeled from the inner layer, and Figure 4(b) is a side cross-sectional view of the lidded container of the second embodiment of the present invention after the outer layer is peeled from the inner layer. [Figure 5] FIG. 5 is an explanatory diagram of the width of the center of the main body and the drinking spout of the lid of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0010] Peelable lid material for beverage containers As shown in FIG. 1(b), the peelable lid material 100 for beverage containers of the present invention is The laminate 100a includes an outer layer 102, an easily peelable layer 104, an inner layer 106, and a heat seal layer 108 in this order, and the surface of the outer layer 102 facing the easily peelable layer 104 and the surface of the inner layer 106 facing the easily peelable layer 104 are directly laminated to the easily peelable layer 104, respectively; It has a main body portion 110 and a tear tab portion 120, The peelable lid material 100 has one inner layer half-cut line 112 for forming a drinking spout at a depth extending from the inner layer 106 side to the easily peelable layer 104, so that when the laminate 100a having the outer layer 102, the easily peelable layer 104, the inner layer 106, and the heat seal layer 108 is pinched and the outer layer 102 is peeled from the inner layer 106 in the tear tab portion 120, the inner layer 106 is removed together with the outer layer 102 in a part of the main body portion 110, and a drinking spout that is open to the outer periphery side of the peelable lid material 100 is formed. It is a peelable lid material.

[0011] In particular, when the above-mentioned lid material 100 is heat-sealed to the flange portion 220 of the container 200, the laminate 100a is pinched and the outer layer 102 is peeled off from the inner layer 106, and the inner layer 106 and the heat-seal layer 108 remain in areas other than the drinking spout.

[0012] A lid material composed of a laminate having the above-described layer structure has sufficient resistance to being dropped when heat-sealed to a container containing contents, i.e., the bag-breaking strength of the lidded container, and the outer layer can be easily peeled from the inner layer, thereby making it easy to form a drinking spout.

[0013] The above-mentioned effect can be achieved regardless of what is used as the heat seal layer, so with the lid material of the present invention having the above-mentioned configuration, the optimal heat seal layer can be selected to match the material of the surface of the container with which it is intended to be combined.

[0014] The lid material of the present invention is useful as a lid material for beverage containers. Here, in the present invention, a "beverage container" means a container that contains a beverage as its contents when a consumer drinks the beverage. At the time of transaction, the contents of the container do not necessarily have to be the beverage itself. For example, at the time of transaction, the contents of the container may be a component of the beverage.

[0015] The covering material of the present invention is preferably configured so that when the outer layer is peeled from the inner layer, the outer layer and the easily peelable layer peel off from the inner layer at the interface between the inner layer and the easily peelable layer, from the viewpoint of obtaining a good peeling feeling without feeling any stress.

[0016] The drinking spout preferably functions not only as a drinking spout itself but also as a spout for pouring the liquid constituting the beverage, i.e., has a sufficient area for the consumer to drink the beverage from. The liquid constituting the beverage may be, for example, a beverage intended to be cooled, such as coffee, if the contents of the container are ice, or may be water if the contents of the container are an instant beverage.

[0017] From the viewpoint of realizing the above-mentioned effect, as shown in Figure 5, the inner layer half-cut line 112 for forming a drinking spout is preferably formed so as to include the central portion 110a of the main body portion 110 of the lid member 100, and more preferably so as to include the center of gravity of the main body portion of the lid member 100. Here, "the central portion of the main body portion" means an area that has the same center of gravity as the center of gravity of the main body portion and a similar shape to the main body portion, and whose perimeter is 10% or more, 15% or more, 20% or more, or 25% or more of the perimeter of the main body portion, and is 50% or less, 45% or less, 40% or less, or 35% or less.

[0018] From a similar perspective, as shown in Figure 5, it is preferable to configure the inner layer half-cut line 112 for forming the drinking spout so that the width 112out of the drinking spout at the outer edge of the peelable lid material is the same as the width 112in of the drinking spout at the center of the peelable lid material (not shown) or narrower (Figure 5), from the perspective of ease of drinking beverages and ease of use as a spout for pouring liquids.

[0019] Hereinafter, first and second embodiments of the covering material of the present invention will be described with reference to the drawings.

[0020] First Aspect In the first aspect of the present invention, the peelable lid material for beverage containers (100) has a tear tab portion (120) located on the outer periphery of the peelable lid material (100) on a side that does not include the portion corresponding to the drinking spout, and further has an inner layer half-cut line for a peel trigger between the tear tab portion and the main body portion, As a result, when the laminate 100a having the outer layer 102, the easily peelable layer 104, the inner layer 106, and the heat seal layer 108 is pinched at the tear tab portion 120 and the outer layer 102 is peeled away from the inner layer 106, the inner layer 106 of the tear tab portion 120 and the inner layer forming the drinking spout are removed as separate parts.

[0021] Here, in the present invention, the fact that the tear-opening tab portion is located on "the side of the outer peripheral edge of the peelable lid material that does not include the portion corresponding to the drinking spout" means that there is no area on the outer peripheral edge of the peelable lid material where the portion corresponding to the drinking spout and the tear-opening tab portion overlap.

[0022] In particular, as shown in Figure 1(a), it is preferable that the opening tab portion 120 is located on the opposite side of the drinking spout from the center of gravity of the main body portion 110 of the peelable lid material 100, from the viewpoint of easily peeling the outer layer from the opening tab portion without applying a large force to the position on the center of gravity side of the main body portion of the lid material of the drinking spout.

[0023] Second Aspect The peelable lid material 100 for beverage containers according to the second aspect of the present invention is With respect to the center of gravity of the main body portion 110 of the peelable lid material 100 as a reference, the tearing tab portion 120 is located on the same side as the drinking spout, and there is no inner layer half-cut line for a peel trigger between the tearing tab portion 120 and the main body portion 110, As a result, when the laminate 100a having the outer layer 102, the easily peelable layer 104, the inner layer 106, and the heat seal layer 108 is pinched in the tear tab portion 120 and the outer layer 102 is peeled off from the inner layer 106, the inner layer 106 of the tear tab portion 120 and the inner layer forming the drinking spout are removed as a continuous portion.

[0024] The components of the present invention in the planar direction will be described below.

[0025] <Main body> The main body is the portion of the lid of the present invention excluding the tear tab. In particular, the main body can be a portion that occupies within the outer periphery of the flange of the container when joined to the container, i.e., a portion that has a shape that corresponds to the shape of the outer periphery of the flange of the container to be sealed.

[0026] The shape of the main body may be, for example, a polygon such as a square or a rectangle, a rounded polygon such as a rounded square or a rounded rectangle, a circle, an ellipse, etc. In other words, the center of gravity of the main body means the center of gravity of these shapes of the main body.

[0027] The central part of the main body means a region that has the same center of gravity as the center of gravity of the main body and a similar shape to the main body, and whose perimeter is 10% or more, 15% or more, 20% or more, or 25% or more of the perimeter of the main body, and 50% or less, 45% or less, 40% or less, or 35% or less.

[0028] <Opening tab> The tear tab is an element that makes it easy to grasp at least a portion of the lid material in order to peel the inner layer bonded to the container from the container, and protrudes from the peripheral edge of the main body of the lid material. The tear tab may be made of at least the inner layer, or a laminate of the inner layer and the outer layer, and is preferably made of the same laminate as the laminate that forms the main body of the lid material from the viewpoint of ease of manufacturing.

[0029] <Half cut line> The half-cut line is a cut formed from the surface of the lid material to a depth less than the thickness of the lid material.

[0030] The half-cut line can be engraved, for example, by a rotary die cutter, laser light irradiation, etc. The half-cut line can be formed on the inner layer side and / or outer layer side of the lid material.

[0031] The inner layer half-cut line is engraved from the surface of the inner layer of the lid material to a depth that penetrates the inner layer and reaches the interface where peeling is intended. For example, when an easily peelable layer is disposed between the outer layer and the inner layer of the lid material and the outer layer is peeled at the interface between the inner layer and the easily peelable layer, the inner layer half-cut line can be formed to a depth that reaches from the surface of the inner layer to the easily peelable layer. Furthermore, when the outer layer is peeled at the interface between the outer layer and the easily peelable layer, the inner layer half-cut line can be formed to a depth that penetrates from the surface of the inner layer to the easily peelable layer.

[0032] Also, for example, when a release varnish layer is partially placed between the outer layer and inner layer of the lid material, the inner layer half-cut line can be formed to a depth that reaches from the surface of the inner layer to the release varnish layer.

[0033] <Inner layer half-cut line for forming the drinking spout and drinking spout> The inner layer half-cut line for forming a drinking spout is an inner layer half-cut line for removing the inner layer together with the outer layer in a part of the main body of the lid when the outer layer is peeled from the inner layer, thereby forming a drinking spout that is open on the outer periphery of the lid. In other words, the drinking spout is formed in the area enclosed by the inner layer half-cut line for forming a drinking spout and the outer periphery of the lid.

[0034] Since the drinking spout is open to the outer periphery of the lid, no overhang is formed by the lid over the drinking spout, and the beverage contained in the container can be easily consumed.

[0035] The drinking spout preferably functions not only as a drinking spout but also as a spout for pouring the liquid constituting the beverage, i.e., has a sufficient area for the consumer to drink the beverage. The liquid constituting the beverage may be, for example, a beverage intended to be cooled, such as coffee, if the contents of the container are ice, or may be water if the contents of the container are an instant beverage.

[0036] From the viewpoint of realizing the above-mentioned effect, as shown in Figure 5, it is preferable that the inner layer half-cut line 112 for forming the drinking spout is formed so as to include the central portion 110a of the main body portion 110 of the lid material 100, and it is even more preferable that it is formed so as to include the center of gravity of the main body portion of the lid material 100.

[0037] From a similar perspective, it is preferable to configure the inner layer half-cut line 112 for forming the drinking spout so that the width 112out of the drinking spout at the outer edge of the peelable lid material is the same as the width 112in of the drinking spout at the center of the peelable lid material (not shown) or narrower (Figure 5), in order to achieve both ease of drinking beverages and ease of use as a spout for pouring liquids.

[0038] <Inner layer half-cut line for peeling trigger> The inner layer half-cut line for triggering peeling is an optional inner layer half-cut line that serves as a trigger for peeling the outer layer from the inner layer.

[0039] 1(a), from the viewpoint of ease of opening the lid, it is preferable that the peel trigger inner layer half-cut line 130 be formed so as to contact the outer periphery of the flange portion 220 of the container when the lid is adhered to the container. It is also preferable that a plurality of peel trigger inner layer half-cut lines be formed approximately parallel to each other, from the viewpoint of increasing the tolerance for deviation in the position of the peel trigger inner layer half-cut line.

[0040] On the other hand, when a plurality of inner layer half-cut lines for triggering peeling are formed substantially parallel to one another, a portion of the inner layer and heat seal layer of the lid may fall off. In this case, from the viewpoint of preventing this portion from being mixed into the container, it is preferable that the lid of the present invention is of the first embodiment, i.e., an embodiment in which the tear tab portion is located on the opposite side of the drinking spout from the center of gravity of the main body of the peelable lid.

[0041] Next, the laminate constituting the lid material of the present invention will be described.

[0042] <Laminate> The laminate constituting the lid material of the present invention is composed of a laminate having an outer layer, an easily peelable layer, an inner layer and a heat seal layer.

[0043] The laminate is preferably configured so that the adhesive strength between the outer layer and the easily peelable layer is greater than the adhesive strength between the inner layer and the easily peelable layer, from the viewpoint of configuring the laminate so that when the outer layer is peeled from the inner layer, the outer layer and the easily peelable layer peel from the inner layer at the interface between the inner layer and the easily peelable layer.

[0044] (outer layer) The outer layer of the lid may be the layer that becomes the outermost layer of the lidded container when the lid is bonded to the container, or the outer layer may be laminated to the inner layer of the lid and then peeled off from the inner layer.

[0045] For example, the outer layer can be laminated on the inner layer to form the outermost layer of a lidded container. The outer layer can be peeled from the inner layer by, for example, pinching the peel tab and pulling up the peel tab.

[0046] The outer layer may have a single layer structure or a multi-layer structure in which multiple layers are laminated.

[0047] The outer layer may be a single layer of a paper layer, a resin layer, a metal foil layer, or a laminate thereof. When such a laminate is used as the outer layer, it is preferable that the surface of the laminate facing the easily peelable layer is composed of a resin layer from the viewpoint of adhesion to the easily peelable layer. The outer layer may further have a printed layer.

[0048] The paper layer may be made of coated paper, art paper, etc. The paper layer may be printed by gravure printing, flexographic printing, or the like.

[0049] The resin layer may be made of a thermoplastic resin such as a polyolefin resin, a vinyl polymer, a polyester, or a polyamide, either singly or in combination. Such a thermoplastic resin may be used in the form of a film or an extruded resin. The film may be either a stretched film or a non-stretched film.

[0050] As the polyolefin resin, for example, a polyethylene resin or a polypropylene resin can be used.

[0051] In this specification, a polyethylene-based resin refers to a resin that contains more than 50 mol%, 60 mol% or more, 70 mol% or more, or 80 mol% or more of ethylene group repeating units in the main chain of the polymer, and is selected from the group consisting of, for example, low-density polyethylene (LDPE), linear low-density polyethylene (LLDPE), medium-density polyethylene (MDPE), high-density polyethylene (HDPE), ethylene-acrylic acid copolymer (EAA), ethylene-methacrylic acid copolymer (EMAA), ethylene-ethyl acrylate copolymer (EEA), ethylene-methyl acrylate copolymer (EMA), derivatives thereof, and mixtures thereof.

[0052] In this specification, a polypropylene-based resin refers to a resin containing more than 50 mol%, 60 mol% or more, 70 mol% or more, or 80 mol% or more of repeating units of propylene groups in the main chain of the polymer, and examples thereof include polypropylene (PP) homopolymer, random polypropylene (random PP), block polypropylene (block PP), chlorinated polypropylene, acid-modified polypropylene, derivatives thereof, and mixtures thereof.

[0053] An example of the vinyl polymer is polyvinyl chloride (PVC).

[0054] Examples of polyester include polyethylene terephthalate (PET) and polybutylene terephthalate.

[0055] Examples of polyamides include nylons such as Nylon (registered trademark) 6 and Nylon MXD6.

[0056] As the metal foil layer, for example, a single metal foil such as aluminum foil, copper foil, or titanium foil, or an alloy foil such as aluminum alloy foil or stainless steel foil can be used.

[0057] The outer layer may further include other layers such as an inorganic vapor deposition layer, a barrier coating layer, and an adhesive layer. Examples of inorganic vapor deposition layers that can be used include silica vapor deposition films, aluminum vapor deposition films, alumina vapor deposition films, and silica-alumina vapor deposition films. Examples of barrier coating layers that can be used include vinylidene chloride coating layers and polyvinylidene fluoride coating layers.

[0058] In particular, when the surface of the inner layer in contact with the easily peelable layer is made of a non-surface-treated surface of a polyester resin or polyamide resin film, it is preferable from the viewpoint of easily realizing the above-mentioned adhesive strength relationship that the outer layer and the easily peelable layer are laminated with an adhesive layer, or the surface of the outer layer in contact with the easily peelable layer is made of a surface-treated surface of a polyester resin or polyamide resin film, particularly a resin film of the same type as the inner layer. Examples of surface treatments include corona treatment, which can improve adhesion by modifying or roughening the surface of these films.

[0059] The thickness of the outer layer can be, for example, 150 μm or less, 100 μm or less, 80 μm or less, or 60 μm or less, and can be 20 μm or more, 30 μm or more, or 40 μm or more.

[0060] (Easily peelable layer) The easily peelable layer is a layer provided between the outer layer and the inner layer to enable the outer layer and the inner layer to be peeled from each other.

[0061] The easily peelable layer may be a layer made of an easily peelable resin, or may be a layer formed by applying a release varnish or the like to the area where the outer layer and inner layer are to be peeled off, or may be a layer combining these.

[0062] The easily peelable resin used in the easily peelable layer is preferably a resin obtained by mixing a polyolefin resin with a cyclic olefin copolymer (COC) at a predetermined ratio. As the polyolefin resin, those described for the outer layer can be used.

[0063] Among polyolefin resins, it is preferable to use polyethylene resins, particularly low-density polyethylene (LDPE).

[0064] The MFR (Melt Flow Rate) of the polyolefin resin, when measured in accordance with JIS K7210 under conditions of a temperature of 190°C and a load of 2.16 kg, may be 0.01 g / 10 min or more, 0.1 g / 10 min or more, or 1.0 g / 10 min or more, and may be 60 g / 10 min or less, 20 g / 10 min or less, or 10 g / 10 min or less.

[0065] The density of polyolefin resin is 0.89 g / cm 3 or more, and the density is 0.94 g / cm 3 It may be the following:

[0066] Cyclic olefin copolymer (COC) refers to a copolymer that can be obtained by mixing an α-olefin and a cyclic olefin in a hydrocarbon solvent such as hexane, heptane, octane, cyclohexane, benzene, toluene, or xylene with a catalyst such as a Ziegler catalyst or a metallocene catalyst.

[0067] The MFR of the COC may be 0.1 g / 10 min or more, 1.0 g / 10 min or more, or 2.0 g / 10 min or more when measured in accordance with JIS K7210 under conditions of a temperature of 190°C and a load of 2.16 kg, and this MFR may be 40 g / 10 min or less, 20 g / 10 min or less, or 10 g / 10 min or less at a temperature of 190°C.

[0068] The interfacial peel strength of the easily peelable layer can be adjusted by changing the mixing ratio of LDPE and COC. The COC content in the easily peelable resin may be 1% by mass or more, or 3% by mass or more, and this content may be 24% by mass or less, 20% by mass or less, 15% by mass or less, 12% by mass or less, or 10% by mass or less. When the COC content is within this range, interfacial peeling between the inner layer or outer layer and the easily peelable layer is facilitated, and the peel strength between them is easily controlled.

[0069] The thickness of the easily peelable layer may be, for example, 10 μm or more, or 15 μm or more, and may be 40 μm or less, 30 μm or less, or 25 μm or less, in order to achieve both adhesion to the layer to be peeled and peelability.

[0070] The easily peelable layer may be made of a nitrocellulose resin, an acrylic resin, a urethane resin, an aminoalkyd resin, a polyamide resin, a polyester resin, or a mixture thereof, or may be made of a water-based varnish, an oil-based varnish, an ultraviolet-curable varnish, or the like.

[0071] The release varnish is preferably a mixture of an easily removable resin and a wax. The wax content in the mixture may be 20% by mass or more and 85% by mass or less, based on the mass of the mixture. When the wax content is within this range, it is possible to prevent picking of other layers adjacent to the release varnish layer and to prevent delamination between the release varnish layers, which is preferable.

[0072] (inner layer) The inner layer of the lid material is a layer laminated to the outer layer via an easily peelable layer.

[0073] The inner layer is laminated with the outer layer of the lid material, and the outer layer can then be peeled off. Furthermore, the half-cut line penetrates the entire inner layer in the lamination direction of the outer and inner layers, so that the inner layer can receive a blade for forming the half-cut line.

[0074] The inner layer may have a single layer structure or a multilayer structure in which a plurality of layers are laminated, and may be a single layer of a paper layer, a resin layer, a metal foil layer, or a laminate thereof.

[0075] The inner layer may also include a resin layer other than those mentioned above, an adhesive layer, an inorganic material vapor deposition film layer, etc. Furthermore, the inner layer may also include a printed layer.

[0076] Among these, it is preferable to use a polyester resin or polyamide resin film for the surface in contact with the easily peelable layer of the inner layer, from the viewpoint of improving the physical strength as a lid material, particularly drop resistance after heat sealing to a container. In particular, when one surface-treated surface of such a film is used, it is preferable that the surface in contact with the easily peelable layer of the inner layer is composed of the untreated surface of such a film, from the viewpoint of suppressing the remaining of the easily peelable layer after peeling of the outer layer, thereby obtaining a good peeling feeling without feeling any stress, and from the viewpoint of facilitating the formation of a drinking spout.

[0077] The thickness of the inner layer can be, for example, 150 μm or less, 100 μm or less, 80 μm or less, or 60 μm or less, and can be 10 μm or more, 20 μm or more, 30 μm, or 40 μm or more.

[0078] (heat seal layer) The heat seal layer is a layer for heat sealing the lid material to the container, and is a layer that can become the innermost layer when the lid material is heat sealed to the container.

[0079] The material for the heat seal layer can be selected depending on the material of the container to be sealed, and for example, polyolefin resins can be used. These resins can be provided in the form of, for example, oriented or unoriented films, molten resins for extrusion lamination, hot melt coatings, etc.

[0080] Furthermore, commercially available sealants that are designated as "easy peel sealants" can be used as the heat seal layer, such as interfacial peeling type sealants, cohesive peeling type sealants, and interlayer peeling type sealants.

[0081] The thickness of the heat seal layer can be, for example, 150 μm or less, 100 μm or less, 80 μm or less, or 60 μm or less, and can be 10 μm or more, 20 μm or more, or 30 μm or more.

[0082] 〈Layer stacking〉 The layers can be laminated by, for example, extrusion lamination such as sand lamination or back lamination, or dry lamination.

[0083] 《Container with lid》 The lidded container of the present invention comprises the above-mentioned lid material and a container having a storage section and a flange section, with the main body section of the lid material being heat-sealed to the flange section of the container.

[0084] The lidded container of the present invention may further have contents stored in the storage section of the container.

[0085] <container> The container has a housing portion and a flange portion.

[0086] (storage area) The storage section is the part where the contents are stored. The shape of this section can be, for example, a substantially truncated cone, a truncated polygonal pyramid, a rectangular parallelepiped, a cube, or the like.

[0087] (flange part) The flange is a peripheral portion of the storage portion of the container, and may be a brim-shaped portion. The shape of the outer periphery of the flange can be selected depending on the shape of the lid material.

[0088] <Contents> The contents are contained in the storage section. Such contents may be a beverage itself or beverage ingredients. Examples of beverage ingredients include ice, instant beverage powder, etc. [Example]

[0089] The present invention will be specifically explained with reference to examples and comparative examples, but the present invention is not limited to these.

[0090] <<Production of laminate constituting lid material>> Example 1 As a laminate for a lid material, a laminate having the following configuration from the outer layer side to the inner layer side was produced: Ny1 (15 μm) / AC agent (0.5 g / m 2 ) / PE (15 μm) / PET1 (12 μm) / Easy-to-peel resin (20 μm) / PET2 (12 μm) / AC agent (0.5 g / m 2 ) / PE (15 μm) / heat seal (HS) layer 1 (30 μm).

[0091] The following materials were used for each layer in the above laminated structure: Ny1 (15 μm): Non-corona treated nylon film AC agent (0.5g / m 2 ): Aliphatic ester anchor coating agent PE (15 μm): Polyethylene PET1 (12 μm): Polyethylene terephthalate film Easy-peel resin (20 μm): A mixture of 5% by mass of cyclic olefin copolymer (COC) and 95% by mass of polyethylene (PE) PET2 (12 μm): Polyethylene terephthalate film without corona treatment Heat seal layer 1 (30 μm): Easy peel sealant

[0092] Specifically, a laminate for a lid material was produced as follows. In the following description, the numbers "PET1" and "PET2" are used to distinguish materials with different sources and / or model numbers:

[0093] 1. One side of Ny1 (15 μm) is subjected to corona treatment, and while this side is coated with AC agent, Ny (15 μm) and PET1 (12 μm) are sandwich laminated with PE (15 μm), and then a member a (Ny (15 μm) / AC (anchor coat) agent (0.5 g / m)) is formed as an outer layer. 2 ) / PE(15 μm) / PET1(12 μm)) was obtained.

[0094] 2. While coating one side of the PET2 (12 μm) as the inner layer with an AC agent, the PET2 (12 μm) and the heat seal layer (30 μm) were sandwich laminated with PE (15 μm) to form a component b (PET2 (12 μm) / AC agent (0.5 g / m)) which is a combination of the inner layer and the heat seal layer. 2 ) / PE (15 μm) / heat seal layer 1 (30 μm)) was obtained.

[0095] 3. The PET1 side of the member a was subjected to a corona treatment, and then an extrusion laminator was used to extrude an easily peelable resin between the PET1 side of the member a and the PET2 side of the member b at a temperature of about 320°C to about 340°C, followed by sand lamination to form a member c (Ny (15 μm) / AC (anchor coating) agent (0.5 g / m)) as a laminate constituting the lid material of Example 1. 2 ) / PE (15 μm) / PET1 (12 μm) / Easy-to-peel resin (20 μm) / PET2 (12 μm) / AC agent (0.5 g / m 2 ) / PE (15 μm) / heat seal layer 1 (30 μm)) was prepared.

[0096] Example 2 A laminate constituting the lid material of Example 2 was obtained in the same manner as in Example 1, except that Ny (15 μm) of member a and PET1 (12 μm) were bonded by dry lamination using a dry lamination adhesive. The layer structure of member a of Example 2 was Ny (15 μm) / / PET1 (12 μm) (hereinafter, " / / " represents the dry lamination adhesive).

[0097] Examples 3 and 4 Except for the fact that PET2 (12 μm) and heat seal layer 1 (30 μm) of member b were bonded by dry lamination using a two-component dry lamination adhesive, laminates constituting the lid materials of Examples 3 and 4 were obtained in the same manner as in Examples 1 and 2. The layer structure of member b in Examples 3 and 4 was PET2 (12 μm) / / heat seal layer 1 (30 μm).

[0098] Example 5 A laminate constituting the lid material of Example 5 was produced in the same manner as in Example 1, except that Ny2 (15 μm, a nylon film corona-treated on both sides) was used instead of PET2 (12 μm) of member b. The layer structure of member b of Example 5 was Ny2 (15 μm) / AC agent (0.5 g / m 2 ) / PE (15 μm) / heat seal layer 1 (30 μm).

[0099] Example 6 A laminate constituting the lid material of Example 5 was produced in the same manner as in Example 1, except that Ny3 (15 μm, a nylon film corona-treated on one side) was used instead of PET2 (12 μm) of member b. The layer structure of member b of Example 5 was Ny3 (15 μm) / AC agent (0.5 g / m 2 ) / PE (15 μm) / heat seal layer 1 (30 μm).

[0100] Comparative Example As material a, paper (80 g / m 2 ) and PET1 (15 μm) were bonded together by dry lamination using a dry lamination adhesive to obtain member a. A heat seal layer 2 (30 μm, cohesive peeling type easy peel sealant) was used as the member b. The PET2 side of the member a and the member b were bonded by dry lamination using a dry lamination adhesive to prepare a laminate constituting the lid material of the comparative example. The layer structure of the comparative example was made up of paper (80 g / m 2 ) / / PET1 (15 μm) / / Heat seal layer 2 (30 μm).

[0101] "evaluation" <Drop Resistance> Using a Pinnacle (registered trademark) mold, each of the obtained laminates was cut into a circle of φ92, and a circular half-cut line of φ85 was made in the center to prepare a lid material for evaluation. Next, 190 g of ice was placed in a container of φ92 and a flange width of 4 mm, and the temperature was 180°C for 1 second and a pressure of 3 kgf / cm 2 The lid material for evaluation was heat-sealed to the container under the conditions above to prepare a lidded container for evaluation.

[0102] The lidded container for evaluation was dropped from a height of 50 cm with the side of the container serving as the dropping surface. The evaluation criteria were as follows: A: There was no change in the appearance of the lid material after the drop. B: Although the appearance of the lid changed after the drop, no breakage of the lid was observed. C: The lid material broke after the drop.

[0103] <Removability> The resulting laminate was cut into strips of 15 mm width and 15 mm length to prepare laminates for evaluation.

[0104] A cutter knife was used to make a half-cut line in the width direction at the edge of the evaluation laminate as a peel trigger. In Examples 1 to 6, the half-cut line was made so as to penetrate through member b and reach the layer of easily peelable resin, and in Comparative Example 1, the half-cut line was made to a depth that reached the center of the sealant layer.

[0105] The evaluation criteria are as follows: A: Peeling was possible without fracture. B: Could not be peeled off without breaking.

[0106] Table 1 shows the configurations and evaluation results of the examples and comparative examples.

[0107] [Table 1]

[0108] It can be seen from Table 1 that the lid materials of Examples 1 to 6 have sufficient resistance to being dropped when heat-sealed to a container containing contents. Furthermore, it can be seen from Table 1 that the lid materials of Examples 1 to 6 have good peelability, and therefore can easily form a drinking spout along the half-cut line. [Explanation of symbols]

[0109] 100 Peelable lid material 102 Outer layer 104 Easily peelable layer 106 Inner layer 108 Heat seal layer 100a laminate 112 Inner layer half-cut line for forming the mouth 112a drinking spout 110 Main body 120 Opening tab 130 Inner layer half cut line for peeling trigger 200 containers 210 Storage area 220 Flange 300 Container with lid

Claims

1. A peelable lid material for a beverage container, The laminate is composed of an outer layer, an easily peelable layer, an inner layer, and a heat seal layer in this order, and the surface of the outer layer facing the easily peelable layer and the surface of the inner layer facing the easily peelable layer are directly laminated to the easily peelable layer, respectively; a body portion and a tear tab portion; a half-cut line in the inner layer for forming a drinking spout at a depth extending from the inner layer side to the easily peelable layer, so that when the laminate having the outer layer, the easily peelable layer, the inner layer, and the heat seal layer is pinched in the tear tab portion and the outer layer is peeled from the inner layer, the inner layer is removed together with the outer layer in a part of the main body portion, and a drinking spout is formed that is open to the outer periphery side of the peelable lid material; the inner layer half-cut line for forming the drinking spout is present so that the drinking spout includes the center of the main body of the peelable lid material, The central portion of the main body portion is a region having the same center of gravity as the center of gravity of the main body portion, a shape similar to that of the main body portion, and a circumferential length that is 35% or less of the circumferential length of the main body portion; The inner layer half-cut line for forming the drinking spout is present so that the width of the drinking spout at the outer peripheral edge of the peelable lid material is narrower than or equal to the width of the drinking spout at the center of gravity side of the main body part of the peelable lid material. Peelable lid material.

2. The lid material according to claim 1, wherein the lid material is configured such that when the outer layer is peeled from the inner layer, the outer layer and the easily peelable layer peel from the inner layer at the interface between the inner layer and the easily peelable layer.

3. The lid material according to claim 2, wherein the surface of the inner layer that contacts the easily peelable layer is made of a non-surface-treated surface of a polyester-based resin or polyamide-based resin film.

4. The lid material according to claim 3, wherein the surface of the outer layer that contacts the easily peelable layer is formed by a surface-treated surface of a polyester-based resin or polyamide-based resin film.

5. The tearing tab portion is located on the outer peripheral edge of the peelable lid material on a side that does not include the portion corresponding to the drinking spout, and further has an inner layer half-cut line for a peel trigger between the tearing tab portion and the main body portion, As a result, when the laminate having the outer layer, the easily peelable layer, the inner layer, and the heat seal layer in the tear tab portion is pinched and the outer layer is peeled from the inner layer, the inner layer of the tear tab portion and the inner layer forming the drinking spout are removed as separate parts. The lid material according to any one of claims 1 to 4.

6. The lid according to claim 5, wherein the tear tab portion is located on the opposite side of the drinking spout from the center of gravity of the main body portion of the peelable lid.

7. The tearing tab portion is located on the same side of the drinking spout as the center of gravity of the main body portion of the peelable lid material, and there is no inner layer half-cut line for a peel trigger between the tearing tab portion and the main body portion, As a result, when the laminate having the outer layer, the easily peelable layer, the inner layer, and the heat seal layer in the tear tab portion is pinched and the outer layer is peeled from the inner layer, the inner layer of the tear tab portion and the inner layer forming the drinking spout are removed as a continuous portion. The lid material according to any one of claims 1 to 4.

8. The lid material according to any one of claims 1 to 7, and Container having a storage section and a flange section and The main body of the lid material is heat-sealed to the flange of the container. Container with lid.

9. The container with lid according to claim 8, further comprising an object stored in the storage section of the container.

10. A lidded container as described in claim 9, wherein the contents are ice.

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