JP2017065809A - Container sealing lid material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lid material having a tab that strikes a balance between a sufficient tab width to prevent tearing and a sufficient tab length to secure easy-pinching.SOLUTION: A container sealing lid material 100 includes: a body part 110 having a round-corner quadrilateral; the tab 120 connected to a corner part of the body part; and a pair of swollen parts 130 swollen toward the tab from two sides of the body part that holds the corner part.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a container sealing lid.

  As a lid for sealing the contents in a container, a lid with a tab is widely used. Examples of the tab include an opening tab for peeling the entire lid member from the container and opening it, and a peeling tab for peeling a portion of the lid member to expose the opening.

  For example, as a container with a lid to seal instant ramen or instant yakisoba that is poured by pouring water or hot water, a part of the lid is peeled off with a peeling tab to expose the opening for drainage, thereby A container with a lid having a mechanism that enables drainage or hot water to be discharged is used. Various aspects have been proposed as such a lidded container.

  Patent Document 1 is a lid material that can be peeled and sealed to a flange portion formed along the edge of the opening of the container body, and is composed of a laminate including an upper sheet and a lower sheet, A lid body, an opening pull tab, and a hot water pull tab, traverse the root portion of the hot water pull tab, connect two points on the outer edges of both sides of the lid material, and lower the lower sheet from the lower surface of the lower sheet A plurality of half cuts for hot water cut holes penetrating the lower sheet from the lower surface of the lower sheet having a desired shape corresponding to the hot water cut holes and having a desired shape corresponding to the hot water cut holes, Disclosed is a lid member that is formed so as to surround a half cut for hot water cut holes and has a peeling region surrounded by a half cut for partial peeling and a half cut for a pull tab that penetrates the upper sheet from the upper surface of the upper sheet. The That.

  Patent Document 2 is configured by laminating a sheet-like base material and a surface material, and a part of the surface material is peeled from the base material to expose a plurality of hot water cut portions. A lid with a hot water draining function is disclosed.

JP 2013-189244 A JP 2006-50035 A

  In general, the shape of the tab needs to be long enough to make the tab easy to pick. Further, when the lid is joined to the container and then shrink-wrapped, it is necessary to design the tab so that the shrink-wrap does not break at the folded end surface of the tab folded downward. When trying to join a lid to a container having a rounded quadrilateral flange, from the viewpoint of reducing the bent end surface of the tab protruding from the flange, the width of the tab is the curvature of the corner of the flange, that is, It will be selected depending on the corner radius.

  More specifically, when the angular radius of the flange portion (204) is large, as shown in FIG. 3 (a), the tab (120) is designed to be thick, and a sufficient length of the tab (120) is set. In order to secure a sufficient length of the tab (120) when the angular radius of the flange portion (204) is small, the tab (120) can be secured as shown in FIG. A thin design is required. In an aspect in which the tab (120) is designed to be thin, a force is applied to a narrow area when the tab (120) is pulled, and as a result, there is a problem that the tab (120) breaks.

  Accordingly, there is a need to provide a lid that has a tab that has both a tab width sufficient to prevent breakage and a tab length sufficient to ensure ease of picking.

As a result of intensive studies, the present inventors have 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:
<1> A container sealing lid,
The body part of a rounded quadrilateral,
A tab connected to a corner portion of the main body portion, and a pair of bulging portions bulging toward the tab from two sides of the main body portion sandwiching the corner portion,
Lid material.
<2> It is composed of a laminate having an outer layer and an inner layer, and the outer layer is peelable from the inner layer,
It has a peeling trigger inner layer half cut line, and the tab is a peeling tab defined by the peeling trigger inner layer half cut line,
The lid material according to <1> above.
<3> The lid according to <1> or <2>, wherein a bulge width of the bulge portion from the main body portion is 1.5 to 10.0 mm.
<4> The lid member according to any one of <1> to <3>, wherein a bulge length of the bulge portion is 20 to 60 mm.
<5> The lid according to any one of <1> to <4>, wherein the tab has a length of 10 to 25 mm.
<6> The lid member according to any one of <1> to <5>, wherein an angular radius of the corner is 11 mm or less.
<7> A container having a flange portion,
The lid material according to any one of <1> to <6> above, wherein the main body portion is joined to the flange portion, thereby sealing the container. And a container with a lid having an outer periphery of the flange portion that is a rounded quadrilateral having a corner portion and having a shape corresponding to the main body portion.
<8> The container with a lid according to claim 7, further comprising a content accommodated in the container.
<9> A package comprising the lidded container according to <7> or <8>, and a shrink film that is shrink-wrapped so as to wrap the entire lidded container.

  ADVANTAGE OF THE INVENTION According to this invention, the lid | cover material which has the tab which made compatible the width | variety of the tab sufficient to prevent a fracture | rupture, and the tab length sufficient to ensure easy picking can be provided.

FIG. 1 is a view showing a lidded container having a lid material of the present invention. Fig.1 (a) is a top view of this container with a lid | cover, FIG.1 (b) is side surface sectional drawing of this container with a lid | cover when peeling the lid | cover material of this invention partially. FIG. 2 is an enlarged view of a region around the tab of FIG. FIG. 3 is an explanatory diagram of the structure of a tab in a conventional lid. FIG. 3A is a diagram illustrating a case where the corner radius of the container is large, and FIG. 3B is a diagram illustrating a case where the corner radius of the container is small. FIG. 4 is a view showing a container with a lid having a lid member according to another embodiment of the present invention. FIG. 4A is a top view of the lidded container, and FIG. 4B is a side cross-sectional view of the lidded container when the outer layer is peeled off.

<< Container sealing lid: Aspect 1 >>
As shown in FIG. 1, the container sealing lid (100) of the present invention comprises a rounded quadrilateral main body portion (110), tabs (120) connected to the corner portions of the main body portion, and corner portions. It has a pair of bulging parts (130) bulging from the two sides of the sandwiching main body part (110) toward the tab (120).

  The inventors of the present invention have provided the above-mentioned bulging portion on the lid member, thereby ensuring a sufficient tab width to prevent breakage and a sufficient tab length to ensure easy picking, particularly a container. It has been found that even when the corner radius of the corner portion is made smaller and / or when the angle of the corner portion where the tab exists is made smaller, both can be achieved.

  The lid member (100) can be heat-sealed to the flange portion (204) of the container (200) to form a lidded container (400). This lidded container (400) may have optional contents (300).

  Hereinafter, the main body portion, the tab, and the bulging portion will be further described with reference to FIG.

<Body part>
The main body portion (110) is a portion of the lid member (100) of the present invention excluding the rounded quadrangular portion, that is, the tab (120) and the bulging portion (130). In particular, the main body portion (110) has a shape corresponding to a shape that occupies the outer periphery of the flange portion (204) of the container when it is joined to the container, that is, a shape of the outer periphery of the flange portion (204) of the container to be sealed. It can be a part having.

  The rounded quadrilateral may be a rounded square, a rounded rectangle, a rounded rhombus, a rounded parallelogram, a rounded trapezoid, or the like, but is preferably a rounded square or a rounded rectangle.

  The boundary line (108) between the body portion (110) and the bulging portion (130) and the tab (120) may be a line that intersects the direction of pulling the tab, and in particular, the corner portion of the body portion (110). It may be a tangent line. Such a line may be, for example, a crease formed in the lid material when the lid material is joined to the container to form a lidded container and then shrink-wrapped. In another embodiment of the present invention described later, Further, it may be a half cut line for peeling trigger. The length of this boundary line is referred to as “tab width” in this specification.

  The corner radius of the body portion may be 11 mm or less, 10 mm or less, or 8 mm or less.

  The length of each side of the main body portion can be independently selected according to the length of each side of the outer periphery of the flange portion of the container to be sealed, and is, for example, 100 mm or more, 110 mm or more, or 120 mm or more. And can be 300 mm or less, 250 mm or less, or 200 mm or less.

<tab>
The tab is a tab connected to a corner portion of the main body portion. Examples of the tab include a peeling tab and an opening tab.

  The tab length (122) is preferably 10 mm or more, or 12 mm or more from the viewpoint of facilitating picking of the tab, and is preferably 25 mm or less, 20 mm or less, or 18 mm or less to prevent an unexpected break of the tab. It is preferable from the viewpoint of prevention.

  According to the configuration of the lid member of the present invention, even when the angular radius of the main body portion is small, the width of the tab (120) can be 8 mm or more, 10 mm or more, or 12 mm or more, thereby breaking the tab. Can be prevented satisfactorily.

<Bulging part>
The bulging portion (130) refers to a pair of portions bulging from the two sides of the main body portion (110) sandwiching the corner portion of the main body portion (110) toward the tab (120). In particular, the bulging portion (130) may be a portion located outside the flange portion (204) of the container when bonded to the container. Due to the presence of the bulging portion (130), the width of the tab (120) is sufficient to prevent the tab (120) from being broken, and the tab (120) is sufficient to secure the tab (120). ) Can be secured.

  The dimensions referred to as “bulge width” and “bulge length” below of the pair of bulge portions (130) may be equal to or different from each other. Preferably equal.

  The bulging width (132) from the main body portion of the bulging portion (130), that is, the distance between one side of the main body portion (110) to which the bulging portion (130) is connected and the farthest point from this one side. Is 1.5 mm or more, or 1.8 mm or more, ensuring a sufficient tab width to prevent tab breakage and a sufficient tab length to ensure easy tab picking. From the viewpoint of In addition, the bulging width is preferably 10.0 mm or less, 5.0 mm or less, 4.0 mm or less, or 3.0 mm or less from the viewpoint of preventing the shrink wrapping from being broken when a container with a lid is used.

  The bulging length (134) of the bulging part (130), that is, the length of the main body part (110) to which the bulging part (130) is connected may be 20 mm or more, 22 mm or more, or 25 mm or more. When the tab is bent by shrink wrapping, it is preferable from the viewpoint of increasing the angle α formed at the bulging portion, thereby making it difficult to break the shrink wrapping. In addition, the bulging length is preferably 60 mm or less, 50 mm or less, or 45 mm or less from the viewpoint of preventing the shrink wrapping from being broken when a container with a lid is used.

<< Container sealing lid: embodiment 2 >>
As shown in FIG. 4, the cover material (100) of another embodiment of the present invention is composed of a laminate having an outer layer (106) and an inner layer (102), and the outer layer (106) is an inner layer (106). 102) having a peeling trigger inner layer half-cut line (102a) and at least one of the tabs defined by the peeling trigger inner layer half-cut line (102a) 124). An easily peelable layer (104) may exist between the outer layer (106) and the inner layer (102). The peeling trigger inner layer half-cut line (102a) may be engraved so as to intersect the peeling direction.

  When the tab is a peeling tab defined by the peeling trigger inner layer half-cut line (102a) as in the case of another embodiment of the present invention, the present inventors It has been found that the effect of ensuring the tab width sufficient to prevent tab breakage due to the presence and the tab length sufficient to ensure tab pinning is more prominent. .

  This lid (100) can optionally comprise an opening tab (126) for completely peeling the lid from the container and opening it, and an outer layer half-cut line ( 106a) and an opening forming inner layer half-cut line (102b) for forming the opening (102b ′).

  Each component in another embodiment of the lid member of the present invention will be described.

<Laminated body>
The lid | cover material of this invention may be comprised with the laminated body which has an outer layer and an inner layer. In this case, the outer layer may be peelable from the inner layer. In order to make the outer layer and the inner layer peelable from each other, an easily peelable layer may be provided between the outer layer and the inner layer.

{Outer layer}
The outer layer of the lid member may be a layer that becomes the outermost layer of the lidded container when the lid member is joined to the container. Moreover, an outer layer can be laminated | stacked on the inner layer of a cover material, and can be peeled from an inner layer after that.

  For example, the outer layer is laminated on the inner layer to become the outermost layer when a container with a lid is formed. Further, for example, the outer layer can be peeled from the inner layer by picking and pulling an optional peeling tab.

  The outer layer may have a single layer structure or a multilayer structure in which a plurality of layers are stacked.

  As the outer layer, a paper layer, a resin layer, a single layer of a metal foil layer, or a laminate thereof can be used.

  As the paper layer, coated paper, art paper or the like may be used. The paper layer may be printed by gravure printing, flexographic printing, or the like.

  As the resin layer, a commercially available film or an extruded resin can be used as appropriate.

  For example, as a film, polyethylene terephthalate film (PET), low density polyethylene film (LDPE), medium density polyethylene film (MDPE), high density polyethylene film (HDPE), linear low density polyethylene film (LLDPE), polypropylene film ( PP), nylon film (Ny) and the like may be used alone or in combination.

  Extrusion resins include low density polyethylene (LDPE), medium density polyethylene (MDPE), high density polyethylene (HDPE), linear low density polyethylene (LLDPE), ethylene methacrylic acid copolymer (EMAA), ethylene acrylic acid copolymer A combination (EAA) or the like may be used alone or in combination.

  Further, the resin layer may include other layers such as an adhesive layer, an inorganic vapor deposition layer, and a barrier coat layer.

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

{Inner layer}
The inner layer of the lid is a layer that can be the innermost layer when the lid is joined to the container.

  Moreover, an inner layer is laminated | stacked with the outer layer of a cover material, and can peel an outer layer after that. Further, the inner layer can receive a blade for forming the half cut line so that the half cut line penetrates the entire inner layer in the stacking direction of the outer layer and the inner layer.

  The inner layer may have a single layer structure or a multilayer structure in which a plurality of layers are stacked. The inner layer can be, for example, a laminate of a base material layer and a sealant layer.

  As the base material layer, commercially available films, extruded resins, and the like can be used as appropriate. For example, as a film, polyethylene terephthalate film (PET), low density polyethylene film (LDPE), medium density polyethylene film (MDPE), high density polyethylene film (HDPE), linear low density polyethylene film (LLDPE), polypropylene film ( PP), nylon film (Ny) and the like may be used alone or in combination. The resin includes low density polyethylene (LDPE), medium density polyethylene (MDPE), high density polyethylene (HDPE), linear low density polyethylene (LLDPE), ethylene methacrylic acid copolymer (EMAA), and ethylene acrylic acid copolymer. (EAA) or the like may be used alone or in combination.

  The inner layer may include a resin layer, an adhesive layer, a metal foil layer, an inorganic vapor deposition film layer, and the like other than those described above. Further, the inner layer may include a printing layer. These films can be corona treated for the purpose of improving adhesion by modifying the surface or roughening the surface.

  The inner layer may have a sealant layer on the side that is the innermost layer of the lid. The sealant layer is a layer for heat-sealing the container to be sealed with the lid material and the lid material. The material of the sealant layer is selected according to the material of the container to be sealed. For example, LDPE, LLDPE, PP, ethylene methacrylic acid copolymer (EMAA), ethylene acrylic acid copolymer (EAA), ionomer resin, ethylene acetate Resins such as vinyl copolymers may be used. These resins can be provided in the form of, for example, a stretched or unstretched film, a molten resin for extrusion lamination, a coating material for hot melt, and the like.

  Particularly preferred are interfacial release type sealants in which resins of different compositions are mixed, cohesive release type sealants in which the film peels off with cohesive failure when the sealant layer is opened and the sealant layer is made into multiple layers. At least one layer is a layer (sealing layer) to be fused with the container, and the other layer is a layer adjacent to the sealing layer (peeling layer), and the layer between the sealing layer and the peeling layer at the time of opening. Easy peel sealant with easy peelability, such as interfacial fracture and delamination type sealant.

  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 20 μm or more, 30 μm, or 40 μm or more.

{Easily peelable layer}
The easily peelable layer is an optional layer provided between the outer layer and the inner layer so that the outer layer and the inner layer can be peeled from each other.

  The easily peelable layer may be an easily peelable resin layer, a layer formed by applying a peeling varnish or the like on a portion where the outer layer and the inner layer are peeled, or a layer in which these are combined.

  The easily peelable resin used for the easily peelable resin layer is preferably a resin in which a cyclic olefin copolymer (COC) is mixed with polyolefin at a predetermined ratio.

  Examples of the polyolefin include polyethylene resin and polypropylene resin, and low density polyethylene (LDPE) is preferable. Examples of the LDPE include a trade name “Petrocene” manufactured by Tosoh Corporation and a trade name “Suntech” manufactured by Asahi Kasei Chemicals Corporation.

  The MFR (melt flow rate) of polyolefin is 0.01 g / 10 min or more, 0.1 g / 10 min or more, when measured under the condition of temperature 190 ° C./load 2.16 kg in accordance with JIS K7210, or It may be 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.

The density of the polyolefin may be 0.89 g / cm ³ or more, and the density may be 0.94 g / cm ³ or less.

  The cyclic olefin copolymer (COC) is a so-called Ziegler catalyst, metallocene, which is obtained by converting an α-olefin and a cyclic olefin into hydrocarbon solvents such as hexane, heptane, octane, cyclohexane, benzene, toluene, and xylene. It refers to a copolymer that can be obtained by preparing a catalyst such as a catalyst. Examples of such a copolymer include trade name “Apel” manufactured by Mitsui Chemicals, Inc.

  The COC MFR is in accordance with JIS K7210, measured at a temperature of 190 ° C./load of 2.16 kg, 0.1 g / 10 min or more, 1.0 g / 10 min or more, or 2.0 g / 10 The 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.

  The easily peelable resin layer can adjust the interfacial peel strength by changing the mixing ratio of LDPE and COC. The content of COC in the easily peelable resin may be 1% by mass or more, or 3% by mass or more, and the content may be 24% by mass or less or 10% by mass or less. If it is such a range, the content of COC is preferable because interfacial peeling between the inner layer or outer layer and the easily peelable resin layer becomes easy, and the peel strength of both is easily controlled.

  The thickness of the easily peelable resin layer may be, for example, 10 μm or more, or 15 μm or more, and may be 40 μm or less, or 25 μm or less in order to achieve both adhesiveness and peelability with the layer to be peeled.

  In addition, the easily peelable layer may be a nitrocellulose resin, an acrylic resin, a urethane resin, an amino alkyd resin, a polyamide resin, a polyester resin, or a mixture thereof, an aqueous varnish, an oil varnish, an ultraviolet curable varnish, etc. It may be.

  The release varnish is more preferably a mixture of an easily peelable resin and a wax. The content of the wax in the mixture may be 20% by mass or more and 85% by mass or less based on the mass of the mixture. Such a range is preferable because picking of another layer adjacent to the peeling varnish layer can be prevented and delamination of the peeling varnish layer can be prevented.

{Lamination of layers}
The layers can be laminated by, for example, extrusion lamination such as sand lamination or back lamination, dry lamination, or the like.

  In particular, the lamination of the inner layer and the outer layer can be performed via an easily peelable layer. More specifically, when the easily peelable layer is an easily peelable resin layer, or a combination of this and a peelable varnish, the lamination of the inner layer and the outer layer is performed via a readily peelable resin layer, such as a sand laminate. It can be performed by a stacking means. When the easily peelable layer is a release varnish, an adhesive layer may be further laminated between the inner layer and the outer layer. As this adhesive layer, for example, a dry laminate adhesive can be used.

<Half cut line>
The half cut line is a cut formed at a depth less than the thickness of the lid material from the surface of the lid material.

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

  For example, the inner layer half cut line is engraved from the surface of the inner layer of the lid material to a depth penetrating the inner layer.

  The inner layer half cut line is engraved with a depth penetrating the inner layer in the thickness direction of the inner layer of the lid. Therefore, the depth of the inner layer half cut line is substantially equal to the thickness of the inner layer of the lid.

  For example, when an easily peelable layer is disposed between the outer layer and the inner layer of the lid member, the inner layer half cut line can be formed from the surface of the inner layer to a depth reaching the easily peelable layer. In this case, the outer layer can be peeled at the interface between the inner layer and the easily peelable layer. The inner layer half cut line can be formed from the surface of the inner layer until it penetrates the easily peelable layer. In this case, the outer layer can be peeled off at the interface between the outer layer and the easily peelable layer.

  For example, when the release varnish layer is partially disposed between the outer layer and the inner layer of the lid, the inner layer half cut line can be formed from the surface of the inner layer to a depth reaching the release varnish layer.

{Outer layer half cut line}
The outer layer half cut line is a half cut line carved from the outer layer side. The outer layer half-cut line can be, for example, a half-cut line for defining a region to be peeled off.

{Inner half cut line}
The inner layer half cut line is a half cut line carved from the inner layer side. For example, the inner layer half-cut line may be a peeling trigger inner layer half-cut line that becomes a peeling trigger, or an opening forming inner layer half-cut line that defines an opening region.

  Here, the “opening” means a configuration capable of discharging the liquid inside, particularly hot water, or allowing the outside air to circulate through the inside, and particularly in the present invention, the inner layer is cut into the inner layer by the inner layer half-cut line. It refers to a defined area.

<Container with lid>
The container with a lid of the present invention includes a container having a flange portion and the lid material described above. The main body portion of the lid member is joined to the flange portion, thereby sealing the container.

  The lidded container can be opened by peeling the lid material from the container.

<container>
The container is a container having a flange portion.

  The outer periphery of the flange portion is a rounded quadrilateral having corner portions and has a shape corresponding to the main body portion of the lid member.

  The material of the container can be arbitrarily selected according to the contents of the container.

  For example, the container can be formed of a material that is impermeable to the contents so that the contents of the container do not ooze out of the container. More specifically, the container may be formed from a resin such as polypropylene or polystyrene.

  The container can contain contents such as instant noodles.

<Contents>
The contents may be contained in a container.

  As the contents, for example, what is supposed to be poured after the lid is opened and then discharged to perform processing such as cooking, such as instant noodles, can be mentioned.

<Packaging body>
The package includes a container with a lid and a shrink film that is shrink-wrapped so as to wrap the entire container with a lid.

<Shrink film>
The shrink film is a shrink film that is shrink-wrapped so as to wrap the entire lidded container.

  As the shrink film, for example, polyvinyl chloride, polystyrene, polyethylene terephthalate, polyolefin or the like can be used. The shrink film may have a printed layer.

  The present invention will be specifically described with reference to Examples and Comparative Examples, but the present invention is not limited to these.

<< Production of containers with lids >>
<Example 1>
{Preparation of the cover material}
The following materials were prepared:
Coated paper (basis weight: 80 g / m ² ): Ryuo Coat, Daio Paper Co., Ltd. Dry laminate adhesive: Takelac A-953 / Takenate A-93, Mitsui Chemicals, Inc. PET (thickness: 12 μm): E5100, Toyobo Co., Ltd. Company Easily peelable resin (thickness 20 μm): LDPE (95% by mass, Petrocene 226 (Tosoh Corporation) + COC (5% by mass, Appel 6013B, Mitsui Chemicals, Inc.)
PET (thickness: 8 μm): CB901, KOLON dry laminate adhesive: LX-500 / KW-75, DIC Graphics Corporation Aluminum foil (thickness: 6.5 μm): Soft aluminum Sealant layer: CMPS (trademark) VN503, Mitsui DuPont Polychemical

The laminate obtained in this example is made of paper (basis weight: 80 g / m ² ) // PET (12) / easily peelable resin (20 μm) / PET (8 μm) // AL (6.5 μm) / sealant ( 20 μm) (where “//” represents a dry laminate adhesive).

  A lid was made as follows:

1. Using a dry laminator, the amount of dry laminate adhesive applied was set to a dry weight of 2.5 g / m ² or more, and the paper and PET film “E5100” were combined with the dry laminate adhesive “Takelac A-953 / Takenate A-93”. To obtain member a (paper (basis weight: 80 g / m ² ) // PET (12 μm)) as an outer layer.

2. Using a dry laminator, set the dry laminate adhesive coating amount to a dry weight of 2.5 g / m ² or more, and apply aluminum foil and PET film “CB901” to the dry laminate adhesive “LX-500 / KW-75”. To obtain a member b (PET (8 μm) // AL (6.5 μm)) as a base material layer.

  3. An easily peelable resin as an easily peelable layer between the PET film “E5100” side of member a and the PET film “CB901” side of member b at a temperature of about 320 ° C. to about 340 ° C. using an extrusion laminator. Was extruded and sand-laminated to obtain a laminated film c.

  4). Using an extrusion laminator, at a temperature of about 240 ° C., extrude “CMPS ™ VN503” as a sealant layer on the aluminum foil side of the member c, back laminate, and laminate film d as a lid stock Obtained.

{Production of containers with lids}
Use a rotary die cutter to pierce the PET film “E5100” from the outer layer of the above laminated film d, and engrave the outer half-cut line at a depth that reaches the easily peelable layer, which is the peeling interface, and then peel easily from the sealant layer. The inner layer half cut line for opening formation and peeling trigger was carved at a depth reaching the PET film “E5100” which is the peeling interface, penetrating the adhesive layer, and the outer peripheral edge of the lid was fully cut to obtain a lid material.

The shape of the lid was as follows:
Shape: Rounded quadrilateral Square radius: 6mm
Short side length: 124.5mm
Long side length: 160mm
Swelling width: 2mm
Swelling length: 32.5mm
Tab length: 15mm

  By making the shape of the lid material as described above, the width of the tab was 11.6 mm.

  Next, the main body portion of this lid member is placed on a flange portion of a polystyrene container (rounded quadrilateral shape, angular radius 6 mm, short side length 124.5 mm, long side length 160 mm, flange width 5.5 mm) at 150 ° C., Heat sealing was performed at 0.15 MPa for 0.4 seconds to prepare five containers with lids of Example 1.

<Example 2>
Except that the angular radius of the lid and the polystyrene container was changed to 12 mm and the bulge length of the bulge was 36.0 mm, so that the tab width was 16.60 mm, In the same manner as in Example 1, five containers with lids of Example 2 were produced.

<Example 3>
Example 1 except that the angular radius of the lid and the polystyrene container was changed to 20 mm, and the bulging length of the bulging portion was 40.7 mm, whereby the width of the tab was 23.20 mm. Similarly, five containers with lids of Example 3 were produced.

<Comparative example>
Five containers with lids of comparative examples were produced in the same manner as in Example 1 except that the bulging portion was not provided in the lid material and thereby the width of the tab was 5.97 mm.

<Reference Example 1>
Five lidded containers of Reference Example 1 were produced in the same manner as in Example 2 except that the bulging portion was not provided in the lid material and the tab width was 10.90 mm.

<Reference Example 2>
Five lidded containers of Reference Example 2 were produced in the same manner as in Example 3 except that the bulging portion was not provided in the lid material and thereby the width of the tab was 17.60 mm.

<Evaluation>
The outer layer was peeled by picking the peeling tab of the produced container with lid. In “Evaluation” in Table 1 below, the case where the outer layer was able to be peeled off without any problem was referred to as “◯”, and the case where the peeling layer was torn off and the outer layer could not be peeled was referred to as “x”. .

  In the containers with lids of Examples 1 to 3, since the tabs did not break, the lid material of the present invention having the bulging portion is compatible with securing the tabs easily and preventing the tabs from being broken. You can understand what you can do. From the results of Example 1 and the comparative example, it can be understood that the action due to the presence of the bulging portion is particularly noticeable when the angular radius of the container is small.

  In Example 2 and Reference Example 1 in which the angular radius was 12 mm, and in Example 3 and Reference Example 2 in which the angular radius was 20 mm, the tab did not break. However, when Example 2 and Reference Example 1 having corresponding angular radii are compared, in Example 2, the width of the tab is large. The same tendency is also observed in Example 3 and Reference Example 2. Therefore, it can be understood that by providing the bulging portion as in the embodiment, the width of the tab can be designed to be large, so that the tab is less likely to break.

DESCRIPTION OF SYMBOLS 100 Cover material 102 Inner layer 102a Inner layer half cut line 102b for peeling trigger 102b Inner layer half cut line 102b 'opening for opening formation 104 Easy peelable layer 106 Outer layer 106a Outer layer half cut line 108 Boundary line 110 Main body part 120 Tab 122 Tab length 124 Peeling tab 126 Unsealing tab 130 Swelling part 132 Swelling width 134 Swelling length 200 Container 204 Flange part 300 Contents 400 Container with lid

Claims (9)

A container sealing lid,
The body part of a rounded quadrilateral,
A tab connected to a corner portion of the main body portion, and a pair of bulging portions bulging toward the tab from two sides of the main body portion sandwiching the corner portion,
Lid material. It is composed of a laminate having an outer layer and an inner layer, and the outer layer is peelable from the inner layer,
It has a peeling trigger inner layer half cut line, and the tab is a peeling tab defined by the peeling trigger inner layer half cut line,
The lid according to claim 1.   The lid | cover material of Claim 1 or 2 whose bulging width from the said main-body part of the said bulging part is 1.5-10.0 mm.   The lid | cover material as described in any one of Claims 1-3 whose bulging length of the said bulging part is 20-60 mm.   The lid | cover material as described in any one of Claims 1-4 whose length of the said tab is 10-25 mm.   The lid | cover material as described in any one of Claims 1-5 whose angular radius of the said corner | angular part is 11 mm or less. A container having a flange,
It is the lid | cover material as described in any one of Claims 1-6, Comprising: The said main-body part is joined to the said flange part, and has comprised the lid | cover material by which the said container is sealed. And the outer periphery of the said flange part is a rounded quadrilateral which has a corner | angular part, and the container with a lid | cover which has a shape corresponding to the said main-body part.   The container with a lid according to claim 7, further comprising a content accommodated in the container. A package comprising: the lidded container according to claim 7 or 8; and a shrink film that is shrink-wrapped so as to wrap the entire lidded container.

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