JP2004026190A - Easily unsealable non-metallic vessel and fast-food contained in the vessel - Google Patents

Easily unsealable non-metallic vessel and fast-food contained in the vessel Download PDF

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Publication number
JP2004026190A
JP2004026190A JP2002183197A JP2002183197A JP2004026190A JP 2004026190 A JP2004026190 A JP 2004026190A JP 2002183197 A JP2002183197 A JP 2002183197A JP 2002183197 A JP2002183197 A JP 2002183197A JP 2004026190 A JP2004026190 A JP 2004026190A
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Japan
Prior art keywords
linear
non
lid
easy
layer
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JP2002183197A
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Japanese (ja)
Inventor
Seiji Kagawa
Yoichiro Kagawa
加川 洋一郎
加川 清二
Original Assignee
Kagawa Atsuko
加川 敦子
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Priority to JP2002183197A priority Critical patent/JP2004026190A/en
Publication of JP2004026190A publication Critical patent/JP2004026190A/en
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Abstract

An object of the present invention is to provide an easy container capable of detecting a lid and a metal-based foreign substance having a sealing property, easy opening property, and dead hold property of the container.
(A) a non-metal container main body; and (b) a heat-sealed lid comprising a linear easily tearable thermoplastic resin film layer and a dead-hold property imparting sealant film layer, and (i) The sealant layer is a copolymer of ethylene and an α-olefin having 3 to 18 carbon atoms, and has a density of 0.870 to 0.910 g / cm 3 and an MFR (190 ° C., 2.16 kg load) of 1 to 1. A linear ethylene / α-olefin copolymer of 100 g / 10 min and a resin composition containing polystyrene; and (ii) the linear easily tearable thermoplastic resin film has a large number of parallel films on at least one surface. (Iii) An easy-opening non-metal container in which a tab is formed on one end of an outer peripheral edge of the lid, and a tear start point is formed on both sides of the tab.
[Selection diagram] Fig. 1

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention includes a lid body having both a sealing property and an easy-opening property even if the sealing surface of the container body is made of polyethylene or polystyrene, and which can be easily torn in a band shape, and has a dead hold property. In addition, the present invention relates to an easily-openable non-metal container capable of easily detecting a metal-based foreign substance by a metal detector after sealing, and an instant food using the same.
[0002]
Problems to be solved by the prior art and the invention
The lid used for instant food containers should be able to heat seal the container body securely in a short time in a low temperature region of 150 ° C or less, have sealing properties to protect the contents, and be easily opened when eating. It is required to have openability. Normally, when the container body is made of paper, the lid is heat-sealed via a polyethylene resin layer laminated on the upper end flange portion, and when the container body is made of polystyrene, the lid is directly attached to the sealing surface of the polystyrene resin. Heat seal body. The lid is provided with a sealant film layer for heat sealing, and a laminated film is often used as the sealant film.However, in order to achieve both sealing and easy-opening properties, as described above, It is necessary to use a sealant film having a different layer configuration depending on the difference in the sealing surface of the container body.
[0003]
Further, a conventional lid made by laminating a polyethylene sealant film, aluminum foil, and paper has a problem that the calorific value is large at the time of incineration treatment. In addition, in the case of ready-to-eat foods such as cup ramen, from the viewpoint of food safety, it is necessary to inspect whether metal-based foreign matter has entered the container, but after heat-sealing the lid with aluminum foil, At present, inspection is performed before heat sealing the lid because it cannot be detected by a metal detector.
[0004]
In addition, in the case of conventional instant food in a cup, after pouring boiling water, a lid such as a plate or chopsticks is placed on the lid to close the lid against the dead-hold property (property of maintaining the peeled state). Must be put, is often troublesome. Also, even if weight is placed, there is often a relatively large gap between the lid and the opening edge of the container body, so that it is not always sufficient to effectively hold the heat of boiling water. is there.
[0005]
In the case of ready-to-eat foods such as cup fried noodles, the hot water must be removed after pouring, but in this case, use a chopstick or the like to hold down the lid to prevent the noodles from falling out of the container. You have to pour hot water. Still, it is often difficult to sufficiently remove hot water.
[0006]
Accordingly, an object of the present invention is to provide a lid body having both a sealing property and an easy-opening property even when the sealing surface of the container body is made of polyethylene or polystyrene, being capable of easily tearing into a band shape, and having a dead hold property. It is an object of the present invention to provide an easily-openable non-metal container which does not use a metal material such as aluminum at all and can easily detect a metal-based foreign matter by a metal detector after sealing.
[0007]
[Means for Solving the Problems]
As a result of intensive studies in view of the above objects, the present inventors have found that in an easily-openable container in which the lid is heat-sealed to the container body, (a) the sealant film layer of the lid has a predetermined density and MFR. When the container is made of a resin composition containing a linear ethylene / α-olefin copolymer and polystyrene, both sealing and easy-opening properties can be achieved even if the sealing surface of the container body is made of polyethylene or polystyrene. If the metal layer is not provided on both the container body and the lid, metal-based foreign matter can be easily detected by a metal detector after the lid is heat-sealed. (C) Dead dead property of the lid Using a paper layer as the non-metallic layer to be applied, and providing a linear easily tearable thermoplastic resin film layer on the lid, and providing tear starting points on both sides of the tab of the lid, the lid is lifted by lifting the tab. The present inventors have found that the belt-like flap portion formed by the tearing can be easily torn in a band shape from the tearing starting point toward the other end of the outer peripheral edge, and that the band-like flap portion remains substantially curled due to the dead hold property. .
[0008]
That is, the easily-openable nonmetallic container of the present invention comprises (a) {the nonmetallic container main body for containing the contents, and (b)} at least a linear easily tearable thermoplastic resin film layer, a non-metallic layer having a dead hold property, and A lid formed of a laminated sheet having a sealant film layer, the lid being heat-sealed through the sealant film at an opening edge of the non-metallic container main body; (i) the sealant film has ethylene and carbon atoms of 3; And α-olefins having a density of 0.870 to 0.910 g / cm.3A resin composition comprising a linear ethylene / α-olefin copolymer having an MFR (190 ° C., 2.16 kg load) of 1 to 100 g / 10 min and polystyrene, and (ii) the linear easy tear The thermoplastic resin film has a large number of substantially parallel linear marks formed on at least one surface thereof, and can be split substantially linearly along the linear marks. (Iii) The lid A tab is formed at one end of the outer peripheral edge of the body, and a tearing start point is formed on both sides of the tab, and when the tab is lifted, the lid body is moved from the tearing start point toward the other end of the outer peripheral edge. It is characterized in that it is easily torn in a band shape, and the band-like flap portion formed by the tear remains substantially curled due to dead-hold property.
[0009]
The linear easily tearable thermoplastic resin film is preferably made of polybutylene terephthalate. Thereby, a dead hold property can be imparted also to the linear easily tearable thermoplastic resin film layer. It is preferable that the depth of the linear mark of the linear easily tearable thermoplastic resin film layer is 1 to 40% of the film layer thickness. It is preferable that the depth of the linear marks is 0.1 mm to 10 m, the width thereof is 0.1 mm to 10 m, and the interval between the linear marks is 10 mm to 200 m.
[0010]
The linear ethylene / α-olefin copolymer is preferably polymerized using a metallocene compound as a polymerization catalyst. The mixing ratio of the linear ethylene / α-olefin copolymer and polystyrene is such that the weight ratio of (linear ethylene / α-olefin copolymer) :( polystyrene) is 50: 50 ° to 90:10. Is preferred. The sealant film has a density of 0.910 to 0.940 g / cm.3And a resin composition further containing an ethylene-based resin having an MFR of 1 to 50 g / 10 min.
[0011]
The tear starting point is preferably a cut or notch provided on the outer peripheral edge of the lid.
[0012]
Further, the non-metal layer imparting the dead hold property is preferably made of paper. It is preferable that a light-shielding ink layer is provided on the paper layer.
[0013]
The non-metallic container main body is preferably (a) a paper having a sealing surface laminated with a polyethylene resin layer, or (b) {a least at least a sealing surface made of polystyrene.
[0014]
The present invention also provides a ready-to-eat food product contained in the above easy-open non-metal container.
[0015]
BEST MODE FOR CARRYING OUT THE INVENTION
[1] Structure of easily openable non-metallic container
(A) Lid
(1) Shape
As shown in FIG. 1, an easily-openable nonmetallic container of the present invention includes a nonmetallic container main body 1 having a desired shape so as to accommodate contents such as ready-to-eat food, and an opening edge 11 of the container main body 1. And a lid 2 which is heat-sealed.
[0016]
As shown in FIGS. 1 and 2, the lid 2 has a tab 3 and a pair of cutouts 4 and 4 provided on both sides of the tab 3 as tear starting points. The tab 3 only needs to be large enough to be picked with a finger and to tear the lid 2.
[0017]
The cuts 4 and 4 as the tear starting points are not particularly limited as long as the tears start easily, and may be, for example, an I-shaped notch shown in FIGS. 1 and 2 or a V-shaped notch. it can. The interval between the pair of cuts 4 and 4 can be appropriately set according to the type of the contents. For example, in the case of cup noodles in which hot water is poured, if the outer diameter of the opening edge 11 of the container body 1 is about 10 cm, it is preferable that the interval D between the cuts 4 is about 4 to 5 cm.
[0018]
In order to completely open the lid 2 at the time of eating, a second tab 31 may be provided integrally with the lid 2 on the outer peripheral edge opposite to the tab 3 as shown in FIG.
[0019]
(2) Layer structure of laminated sheet
As shown in FIG. 4, the lid 2 has a linear easily tearable thermoplastic resin film layer 21, a non-metal layer 22 that imparts a dead hold property, and a sealant film layer 24. In the case where light-shielding properties are imparted, it is preferable to provide a light-shielding ink layer 23 on the non-metal layer 22 that imparts dead hold properties as shown in FIG. Hereinafter, each layer will be described in detail.
[0020]
(A) Linear easily tearable thermoplastic resin film layer
The lid 2 of the present invention has a linear tearable thermoplastic resin film layer on at least one surface (the outer surface of the paper layer 22 in the illustrated example) of the paper layer 22 in order to prevent the tear direction from shifting. 21 are provided. The linearly tearable thermoplastic resin film has a large number of substantially parallel linear marks formed on at least one surface, and has a linear tearability in one direction regardless of the orientation of the raw material film. Since it has, it can be torn linearly along a linear mark from an arbitrary part. Therefore, the linear easily tearable thermoplastic resin film layer 21 is provided such that the direction of the linear mark and the direction of tearing of the lid 2 coincide. With the linearly tearable thermoplastic resin film layer 21 arranged in this manner, the lid 2 is torn substantially straight from the cuts 4, 4, and an opening of substantially the same size is formed in any lid 2. Is done.
[0021]
As the material of the linear easily tearable thermoplastic resin film, for example, polyester such as polybutylene terephthalate (PBT) and polyethylene terephthalate (PET), nylon, polypropylene and the like can be used. In the linear easily tearable thermoplastic resin film, the linear marks do not penetrate. Therefore, those made of PBT # or PET are suitable for use in containers for instant foods or the like in which fragrance retention and gas barrier properties are important. In particular, the use of PBT can impart a dead hold property to the linear easily tearable thermoplastic resin film layer 21 as well. When moisture retention is required, it is preferable to use a polypropylene film.
[0022]
The thickness of the linear easily tearable thermoplastic resin film is preferably about 10 to 20 μm, for example, about 12 μm. For example, in the case of a PBT film, if it is this thickness, it has sufficient fragrance retention and gas barrier properties, imparts tear linearity to the lid 2, and has good gloss and printing characteristics.
[0023]
In the straight easily tearable thermoplastic resin film, the depth of the linear marks is preferably 1 to 40% of the film thickness. This makes it possible to achieve both film strength and good linear tearability. The linear marks preferably have a depth of 0.1 to 10 μm, a width of 0.1 to 10 μm, and an interval between the linear marks of 10 to 200 μm.
[0024]
In order to produce a linear easily tearable thermoplastic resin film, for example, a method disclosed in Japanese Patent Application No. 2002-125045 is employed. The method for manufacturing a linear easily tearable thermoplastic resin film disclosed in Japanese Patent Application No. 2002-125045 discloses a method of forming a roll (hereinafter referred to as a “pattern roll”) 8 having a large number of fine projections as shown in FIG. The resin film 7 is slid and the film 7 is slid against the pattern roll 8 by blowing air from the opposite side of the pattern roll 8 to the pattern roll 8 at the position where the film 7 slides on the pattern roll 8. Thus, a large number of substantially parallel linear marks are formed on the film 7. When the film 7 unwound from the reel 71 on which the film is wound is passed through the nip roll 72 and comes into contact with the pattern roll 8, a linear mark is formed, and the obtained linear easily tearable thermoplastic resin film is obtained. Is wound on a take-up reel 76 via a nip roll 73 and guide rolls 74 and 75. The position of the pattern roll 8 in the width direction of the film 7 is fixed. The pattern roll 8 is longer than the width of the film 7 and is in sliding contact with the entire width of the film 7.
[0025]
As the pattern roll 8, for example, the one described in JP-A-2002-059487 can be used. It has a structure in which a large number of fine particles having a Mohs hardness of 5 or more having sharp corners are attached to the surface of a metal roll main body by an electrodeposition method or an organic or inorganic binder. The metal roll main body is formed of, for example, iron and an iron alloy, or a surface coated with a nickel plating layer or a chromium plating layer. Examples of the fine particles having a Mohs hardness of 5 or more include cemented carbide particles such as tungsten carbide, silicon carbide particles, boron carbide particles, sapphire particles, cubic boron nitride (CBN) particles, and natural or synthetic diamond fine particles. Can be. Particularly, synthetic diamond fine particles having high hardness and strength are desirable. The particle size of the fine particles is appropriately selected according to the depth or width of the linear trace to be formed. It is desirable that the fine particles have a particle size of 10 to 100 μm and a variation of the particle size is 5% or less. The degree to which the fine particles are attached is appropriately selected so that the interval between the linear traces to be formed is a desired degree. In order to obtain a uniform linear mark, it is desirable that the fine particles adhere to the roll body surface by 50% or more. As a specific example of the pattern roll 8, a large number of synthetic diamond fine particles having sharp corners on the surface of an iron roll main body are bonded and fixed at an area ratio of 50% or more via a nickel-based electrodeposition layer. Is mentioned. The outer diameter of the pattern roll 8 is preferably 2 to 20 cm, and more preferably 3 to 10 cm.
[0026]
It is preferable that the pattern roll 8 is rotated in a direction opposite to the traveling direction of the film 7 at a peripheral speed lower than the traveling speed of the film 7. As a result, it is possible to prevent the occurrence of film wrinkles and to prevent the shavings generated due to the formation of the linear marks from being accumulated on the surface of the pattern roll 8, thereby forming the linear marks having an appropriate length and depth. it can. The traveling speed of the film 7 is preferably set to 10 to 500 m / min. Further, the peripheral speed of the pattern roll 8 (the speed at which the film 7 is rotated in the direction opposite to the traveling direction of the film 7) is preferably 1 to 50 m / min.
[0027]
Regarding how to wind the film 1 around the pattern roll 8 fixed at a fixed position, the angle θ between the winding direction and the unwinding direction of the film 7 shown in FIG. 7 is set to be in the range of 60 ° to 170 °. Is preferred. This makes it easier to adjust the length and depth of the linear mark. More preferably, the angle θ is in the range of 90 ° to 150 °. In order to set the angle θ to a desired value, the positional relationship between the pattern roll 8 and the nip rolls 72 and 73 may be appropriately adjusted by changing the height position of the pattern roll 8 or the like. Further, the tension applied to the film 7 by the nip rolls 72 and 73 and the wind pressure applied by the nozzle 9 are appropriately adjusted in accordance with the winding method of the film 7 around the pattern roll 8 and the outer diameter, so that the desired length and depth are obtained. A linear mark is obtained. The tension (tension per width) applied to the film by the nip rolls 72 and 73 is preferably in the range of 0.01 to 5 kgf / cm width.
[0028]
Also, as shown in FIG. 7, when compressed air is blown using the nozzle 9 having the hood 92 to cover the pattern roll 8, the compressed air blown out from the outlet 91 is difficult to diffuse before reaching the sliding contact surface. Thus, the contact force between the film 7 and the pattern roll 8 on the sliding contact surface can be made more uniform. The pressure of the compressed air flow blown by the nozzle 9 is 0.05 to 5 kgf / cm.2It is preferred that Thereby, the contact force between the film 7 and the pattern roll 8 on the sliding contact surface can be made uniform. More preferably, the pressure of the compressed air flow is 0.1 to 2 kgf / cm.2It is. The distance from the outlet 91 to the sliding surface is preferably 10 to 50 cm. The compressed air only needs to uniformly hit at least a range covering the sliding contact surface.
[0029]
(B) Non-metal layer with dead hold property
The lid 2 of the present invention has a nonmetallic dead-holding property-imparting layer instead of having an aluminum layer (aluminum foil, aluminum vapor-deposited layer, etc.). The preferred material of the non-metal layer 22 having the dead-hold property is paper, but the type of paper is not limited and includes synthetic paper.
[0030]
When a paper layer is used as the non-metal layer 22 having the dead-hold property, the thickness of the paper layer is determined by the width D (approximately equal to the interval between the cuts 4 and 4) of the band-shaped flap portion 6 to which the dead-hold property is to be provided. Generally, it is necessary to increase the thickness of the paper layer in proportion to the width D of the band-shaped flap portion 6. As a specific example, when the width D of the band-shaped flap portion 6 is about 4 to 5 cm, the thickness of the paper layer is about 60 to 100 g / m.2Preferably, about 70 to 90 g / m2More preferably, The thickness of the paper layer is about 60 g / m2If it is less than 1, the stiffness of the paper layer is too weak to provide a sufficient dead hold property. On the other hand, the thickness of the paper layer is about 100 g / m2Even if it is increased, only the cost is increased, and no further improvement in dead hold property is recognized. Further, for example, in the case of a container for fried noodles having an opening edge portion of about 17 cm, the width of the band-shaped flap portion 6 is preferably about 5 to 8 cm, so the thickness of the paper layer is about 60 to 110 g / m.2And preferably about 75 to 90 g / m.2More preferably,
[0031]
(C) Sealant film layer
In the present invention, the sealant film layer 24 heat-sealed to the opening edge 11 of the container body 1 is obtained by copolymerizing ethylene and an α-olefin having 3 to 18 carbon atoms, and has a density (JIS K6922) of 0. 0.870 to 0.910 g / cm3And a resin composition containing polystyrene and a linear ethylene / α-olefin copolymer having an MFR (JIS K6921, 190 ° C, 2.16 kg load) of 1 to 100 g / 10 min. Thus, even if the sealing surface of the container body is made of polyethylene or polystyrene, a multi-sealant layer capable of achieving both sealing properties and easy-opening properties can be formed by heat sealing the lid of the present invention.
[0032]
Specific examples of the linear ethylene / α-olefin copolymer include a binary copolymer obtained by copolymerizing ethylene and one kind of α-olefin having 3 to 18 carbon atoms, and ethylene and 2 And terpolymers obtained by copolymerizing various kinds of α-olefins having 3 to 18 carbon atoms. Examples of the α-olefin having 3 to 18 carbon atoms include propylene, 1-butene, 1-hexene, 1-heptene, 1-octene, 1-decene, 1-dodecene, and the like. The above may be used.
[0033]
The linear ethylene / α-olefin copolymer has a density of 0.870 g / cm.3If it is less than 10, the blocking property is poor, elongation or breakage may occur during the formation of the sealant film, and the cut property of the film is poor. On the other hand, the density is 0.910 g / cm3If it exceeds, the adhesiveness to the sealing surface of the container is inferior. The preferred density is between 0.875 ° and 0.905 ° g / cm3It is.
[0034]
When the linear ethylene / α-olefin copolymer has an MFR of less than 1 g / 10 min, the melt viscosity is too high and the extensibility at the time of extrusion processing is insufficient. Since it is too low, the neck-in is large and the moldability is poor. The preferred MFR is from 2 to 80 g / 10 minutes.
[0035]
The linear ethylene / α-olefin copolymer used in the present invention can be produced by polymerization using a known titanium-based catalyst or metallocene catalyst, but high-pressure ionic polymerization using a metallocene compound as a polymerization catalyst, It is preferable to use a copolymer produced by gas phase polymerization or solution polymerization.
[0036]
Examples of the metallocene catalyst include, for example, JP-A-58-19309, JP-A-59-95292, JP-A-60-35005, JP-A-60-35006, JP-A-60-35007, and JP-A-60-35007. JP-A-35008, JP-A-60-35009, JP-A-61-130314, JP-A-3-163030, EP-A-420,436, and U.S. Pat. No. 5,055,438. , Metallocene catalysts or metallocene / alumoxane catalysts described in WO 91/04257 and the like, and metallocene compounds such as those disclosed in WO 92/07123 and the like, and such metallocene compounds And a compound comprising a compound that reacts with the compound to form a stable ion.
[0037]
Specific examples of such a linear ethylene / α-olefin copolymer include “Kernel KF-360”, “Kernel KF-365”, and “Kernel KC-650” (all of which are Nippon Polychem Co., Ltd.). Manufactured).
[0038]
As polystyrene, so-called general-purpose polystyrene resins, rubber-modified polystyrene resins, and mixtures thereof can be used. A styrene homopolymer is usually used as a general-purpose polystyrene resin. The rubber-modified polystyrene resin is obtained by polymerizing a styrene monomer in the presence of a rubber-like polymer such as butadiene rubber. As the molecular structure of polystyrene, either a linear type or a branched type may be used. Polystyrene can be made into a branched type by copolymerizing with a polyfunctional vinyl monomer such as divinylbenzene, or by using a polyfunctional initiator, a polyfunctional chain transfer agent, or the like.
[0039]
Styrene is generally used as a styrene-based monomer used for polymerization of general-purpose polystyrene resin or rubber-modified polystyrene resin, but alkyl such as α-methylstyrene, o-methylstyrene, m-methylstyrene, p-methylstyrene, etc. Substituted styrene can also be used. Specific examples of polystyrene include “PSP-G930”, “HIPS-475D”, and “HIPS-HT516” (all manufactured by A & M Polystyrene Co., Ltd.).
[0040]
When the sealant film contains polystyrene, not only can the above-described multi-sealant layer be formed, but also a tear-enhancing effect, an anti-blocking effect, an anti-static effect, and the like are exhibited.
[0041]
The mixing ratio of the linear ethylene / α-olefin copolymer and polystyrene is such that the weight ratio of (linear ethylene / α-olefin copolymer) :( polystyrene) is 50: 50 ° to 90:10. And more preferably 75: 25 ° to 85:15.
[0042]
If the ratio of the linear ethylene / α-olefin copolymer exceeds 90% by weight, with the total of the linear ethylene / α-olefin copolymer and polystyrene being 100% by weight, the sealing surface of the container body is made of polystyrene resin. In some cases, the bond strength is not sufficient. On the other hand, if the proportion of polystyrene exceeds 50% by weight, the adhesive strength becomes insufficient when the sealing surface is a polyethylene resin layer.
[0043]
The resin composition constituting the sealant film has a density of 0.910 to 0.940 g / cm in order to adjust the adhesiveness, film strength, and the like.3And an MFR having an MFR of 1 to 50 g / 10 min. Examples of such an ethylene-based resin include a high-pressure low-density polyethylene, a linear low-density ethylene copolymer, and an ethylene / vinyl acetate copolymer. The proportion of the ethylene-based resin is preferably 10 to 30% by weight based on 100% by weight of the entire resin composition constituting the sealant film.
[0044]
A lubricant, an antiblocking agent, a stabilizer, an antistatic agent, a colorant, and other various additives may be added to the resin composition as needed.
[0045]
The sealant film can be formed by, for example, melting a linear ethylene / α-olefin copolymer, polystyrene, and an ethylene-based resin and extruding the same from a T-die. The thickness of the sealant film is preferably from about 10 to 40 μm, more preferably from about 20 to 30 μm.
[0046]
Even if many substantially parallel linear marks are formed on at least one surface of the sealant film by the method described in the above (a) in order to impart easy opening property (easy tearing property). Good. In this case, the sealant film layer 24 is provided so that the tearing direction of the lid 2 and the linear mark direction of the sealant film match.
[0047]
Moreover, in order to provide easy opening property (easy tearing property), countless fine holes may be provided at least in the tearing area of the sealant film. The micropores may or may not penetrate the sealant film. Generally, the micropores have an average opening diameter of 0.5 to 100 μm, and the density in the tear area is about 500 / cm.2The above is preferable. The density of micropores is about 500 / cm2If it is less than the above, the tearability is insufficient. Note that the upper limit of the micropore density may be any technically possible, and is not particularly limited.
[0048]
In order to form micropores in the sealant film, for example, a method disclosed in Japanese Patent Publication No. 7-90567 or JP-A-2002-059487 is employed. The method for manufacturing a long porous sealant film disclosed in Japanese Patent Publication No. 7-90567 has been described with reference to the first roll ((a) above) in which a large number of fine particles having a Mohs hardness of 5 or more having sharp corners are adhered to the surface. A long sealant film is passed between the pattern roll 8 and a second roll having a smooth surface, and the pressing force on the long sealant film passing between the rolls is brought into contact with each roll. By adjusting so as to be uniform over the entire surface of the film, the long sealant film has 500 or less through-holes or non-through holes in the long sealant film at sharp corners of a large number of fine particles on the first roll surface. / Cm2Many are formed with the above density.
[0049]
(D) Light-shielding ink layer
Since the lid 2 of the present invention does not have an aluminum layer, when used in a container that requires light-shielding properties, the light-shielding ink layer 23 is formed on one surface of the paper layer 22 (shown in FIG. 5). Is preferably provided on the inner surface of the paper layer 22). The light-shielding ink is not particularly limited as long as the ink contains a black or dark pigment or dye such as carbon black. Although the thickness of the light-shielding ink layer 23 depends on the concentration of the black pigment or dye in the ink, it is generally sufficient that the thickness can sufficiently block ultraviolet light and visible light.
[0050]
(E) Layer configuration example
4 and 5 illustrate a preferred layer configuration of the lid 2. FIG. 4 shows a layer configuration including a linear easily tearable thermoplastic resin film layer 21, a paper sheet 22, and a sealant film layer 24 as a basic configuration of the lid 2. There is an adhesive layer 25 between each layer.
[0051]
FIG. 5 shows an example in which a light-shielding ink layer 23 is provided on the back surface of the paper layer 22 in order to provide good light-shielding properties. The adhesive layer 25 is preferably an extruded lamination polyethylene layer.
[0052]
(3) Other embodiments
The shape of the lid 2 of the present invention is not limited to the illustrated one, and various changes can be made as long as the gist is not changed. For example, as described in Japanese Patent Application No. 2001-386268, (B) second tabs are provided on both outer sides of each of the cuts 4 and 4, and (B) {the lines 4 'and 4' in the sealant film layer along the lines 4 'and 4'. (C) forming a perforation in the sealant film along a straight line extending from each of the cuts 4 and 4, or (d) making a sealant film along a straight line extending from each of the cuts 4 and 4. Alternatively, a linear cut may be formed by laser light, or (e) a folded portion may be formed along a straight line extending from each of the cuts 4 and 4 (both not shown).
[0053]
Further, as described in Japanese Patent Application No. 2002-161680, a U-shaped cut (a connecting portion connecting both straight portions of the U-shaped cut) is connected on the outer peripheral side of the lid 2 to the inside of the tab 3. In this configuration, the tab portion is lifted and the lid is partially opened to form a plurality of hot water cutouts along cuts formed along the extension of the U-shaped cut (not shown). ). This container has good sealing and draining properties, is low in cost, and is particularly useful as a container for yakisoba which needs to be drained after pouring hot water.
[0054]
(B) Container body
The container body 1 can be formed of a synthetic resin such as paper or styrene foam. As described above, in the present invention, since the sealant film layer of the lid is made of the resin composition containing the linear ethylene / α-olefin copolymer having a predetermined density and MFR and polystyrene, the container Even if the sealing surface of the main body is made of polyethylene or polystyrene, both sealing performance and easy opening performance can be achieved. In the case of the paper container main body, there is an advantage that not only incineration is easy, but also gas which has a bad influence on the environment is not generated at the time of incineration. Further, in the case of the styrofoam container body, there is an advantage that it is excellent in heat retention. The shape of the container body 1 is not limited to the illustrated one, and can be variously changed according to the type of the contents.
[0055]
[2] Manufacturing method of lid
(A) Manufacturing method of laminated sheet
For example, when forming a laminated sheet for the lid 2 shown in FIG. 5, an adhesive layer is formed by extruding polyethylene on both sides of long paper coated with light-shielding ink, and a sealant is formed on the light-shielding ink layer side. While laminating the films, a linear easily tearable thermoplastic resin film is laminated on the opposite side to form a laminated sheet 20 which is the raw material of the lid 2. In addition, it is preferable to previously form innumerable fine holes in the sealant film by the above method. In addition, the linear easily tearable thermoplastic resin film is arranged such that the linear mark direction matches the longitudinal direction of the long paper.
[0056]
(B) Punching of lid
As shown in FIG. 8, a plurality of lids 2 are manufactured at a time by punching a laminated sheet 20. At this time, the directions of the cuts 4 and 4 are made to coincide with the longitudinal direction of the long paper (the direction of the linear mark of the linear easily tearable thermoplastic resin film). The punching process may be performed on a multi-layer laminated sheet.
[0057]
(C) Heat seal to container body
After the desired contents, for example, dried noodles, powdered soup and ingredients that can be eaten by pouring boiling water are stored in the non-metallic container main body 1, the sealant film layer of the lid 2 is placed on the opening edge 11 of the container main body 1. The 24 annular contact portions 2a are brought into contact and heat sealed. In order to provide easy peelability, the heat sealing temperature is preferably about 120 to 160 ° C.
[0058]
[3] Instant food in a container and its eating procedure
Instant foods which preferably use the easily-openable nonmetallic container shown in FIG. 1 include cup ramen, cup fried noodles, powdered stew, powdered or fluidized miso soup, powdered or fluidized ground powder, and the like. . The eating procedure will be described below, taking the case of using it for cup ramen as an example.
[0059]
In the cup ramen, dry noodles (or fried noodles) 30, liquid soup in powdered soup or sachet, and ingredients (or ingredients in sachets) are put into a bottomed cylindrical container body 1 made of paper, for example. The lid 2 is heat-sealed to the opening edge 11 of the container body 1.
[0060]
When the tab 3 of the lid 2 is grasped with a finger and pulled to the opposite side of the lid 2, the lid 2 is separated from the I-shaped or V-shaped notched cuts 4, 4 located on both sides of the tab 3 by a line 4. The strip 2 is torn along ', 4' to form a rectangular opening 5 in the lid 2 as shown in FIG. The band-shaped flap portion 6 formed by the tearing has a sufficient dead-holding property without having an aluminum layer, and is maintained in a curled state. Therefore, hot water may be poured into the rectangular opening 5 as it is.
[0061]
After pouring hot water, when the band-shaped flap portion 6 is returned to the original position, the band-shaped flap portion 6 has cut-out portions 6a of the paper at the outer edge thereof. Engagement with the broken portion 5a prevents the strip flap portion 6 from lifting. Thus, the lid 2 of the present invention has the convenience that the rectangular opening 5 can be closed without placing anything on the band-shaped flap 6. After the dried noodles 30 are ready to be eaten, the user grips the second tab with his finger, peels off the lid 2 from the heat-sealed portion, opens the entire surface, and eats the ramen in the container body 1.
[0062]
In addition, in the ready-to-open food in a non-metal container of the present invention, not only the area of the rectangular opening 5 is smaller than that of the conventional full opening type opening, but also the state in which the band-shaped flap 6 is locked in the rectangular opening 5. Therefore, even if the container body 1 is accidentally turned over, the amount of hot water leaking is reduced.
[0063]
Alternatively, the contents (for example, noodles 30 and ingredients) can be made edible by pouring water instead of hot water into container body 1 and placing the contents in a microwave oven.
[0064]
【Example】
The present invention will be described in more detail with reference to the following examples, but the present invention is not limited to these examples.
[0065]
Example 1
(Production of sealant film)
80 parts by weight of a linear ethylene / α-olefin copolymer [trade name “Kernel KF-360” (manufactured by Nippon Polychem Co., Ltd.)] and polystyrene [trade name “PSP-G930” (A & M Polystyrene Co., Ltd.) ))] To obtain a resin composition obtained by dry blending 20 parts by weight. The obtained resin composition was put into an extruder, melt-kneaded at 300 ° C., and a resin solution was prepared in the extruder. Subsequently, the resin solution was extruded from a T-die provided at the tip of the extruder, and cooled while being taken up by a roll to form a sealant film having a thickness of 30 μm.
(Preparation of linear easily tearable PBT film)
For a PBT film having a thickness of 20 μm, the film traveling speed is 50 m / min, the peripheral speed (reverse rotation) of the pattern roll is 10 m / min, and the nozzle wind pressure is 1 kgf / cm.2The film tension applied by the nip roll is set to 0.5 kgf / cm width, and is brought into sliding contact with a pattern roll (electrodeposited synthetic diamond fine particles having a particle diameter of 100 μm; diameter: 5 cm) fixed at a fixed position. A linearly tearable PBT film having a linear mark formed in the film traveling direction (longitudinal direction) was produced.
(Formation of laminated sheet)
A laminated film was formed using the obtained sealant film and the linearly tearable PBT film. The laminated film has a thickness of 79 g / m.2A polyethylene was extruded on both sides of the paper sheet to form an adhesive layer, a sealant film was formed on one side, and a linearly tearable PBT film was formed on the opposite side by pressure bonding with a roll.
(Production of lid)
The lid was obtained by punching the obtained laminated sheet.
(Measurement of initial opening strength)
The obtained lid is placed on a paper container main body having a polyethylene resin layer on the sealing surface at 130 ° -170 ° C., 0.7 kgf / cm.2After heat sealing using a heat sealer under the conditions of and 0.7 seconds, the initial opening strength was measured. The results are shown in FIG.
[0066]
Comparative Example 1
As the lid, a hot-melt layer (commercially available extruded sealant for polyethylene sealing surface), an aluminum foil, and a laminated sheet composed of paper were used. Was measured. The results are shown in FIG.
[0067]
Example 2
Using the same lid as in Example 1, the container body (seal surface: polystyrene resin) made of foamed styrene was heated at 120 to 170 ° C. and 0.7 kgf / cm.2After heat sealing under the conditions of 0.7 seconds, the initial opening strength was measured. The results are shown in FIG.
[0068]
Comparative Example 2
As the lid, a hot melt layer (commercially available extruded sealant for a polystyrene sealing surface), a laminated sheet made of aluminum foil and paper was used, and after heat sealing as in Example 2, the initial opening strength was used. Was measured. The results are shown in FIG.
[0069]
As is clear from FIGS. 10 and 11, the lid of the present invention has an initial opening strength of about 1 to 1.9 kgf for both the polyethylene sealing face and the polystyrene sealing face, and the polyethylene as the adhesive layer. It has the same performance as that of a conventional lid having a hot melt for a sealing surface (Comparative Example 1) and a conventional lid having a hot melt for polystyrene (Comparative Example 2). It can be seen that even if the sealing surface is made of polyethylene or polystyrene, both the sealing property and the easy opening property can be achieved.
【The invention's effect】
As described in detail above, the easy-opening non-metallic container of the present invention comprises a sealant film layer of a lid formed of a resin containing a linear ethylene / α-olefin copolymer having a predetermined density and MFR and polystyrene. It is composed of a composition. Therefore, even if the sealing surface of the container body is made of polyethylene or polystyrene, both the sealing property and the easy opening property can be achieved.
[0070]
The easy-opening nonmetallic container of the present invention also has a lid made of a laminated sheet having at least a linear easily tearable thermoplastic resin film layer, a deadhold imparting nonmetallic layer and a sealant film layer. A tear starting point is formed on both sides of the tab formed at one end of the outer peripheral edge. Therefore, when the tab is lifted, the lid is easily torn in a band shape from the tearing start point toward the other end of the outer peripheral edge, and the band-shaped flap portion formed by the tearing can be performed without using a metal layer such as aluminum foil for the lid. Has a sufficient dead hold property.
[0071]
The easily-openable container of the present invention is also aluminum-free for both the container body and the lid, so that it is possible to avoid adverse effects on the environment when performing incineration treatment, and to use a metal detector after sealing the lid to detect metal-based foreign matter. Can be detected. As a result, not only can the safety of the ready-to-eat food be further improved, but also the inspection cost can be significantly reduced because a metal detector can be used.
[0072]
In addition, since the band-shaped flap portion is opened, for example, after pouring hot water into the container main body, the band-shaped flap portion is returned to the original position and engaged with the side edge of the opening, so that both of them can be used. The broken portions of the paper layers are engaged with each other, and the band-shaped flap portion is closed with a slight gap left. Therefore, if the belt-shaped flap portion is closed after the hot water is injected, the lid can be closed as it is. Also, by simply tilting the container body, it is possible to discharge only the hot water while keeping the contents in the container body. Furthermore, even when the container body is accidentally turned over after pouring hot water, the amount of leaking hot water can be suppressed.
[0073]
The easily-openable nonmetallic container of the present invention having such features is suitable as a container for instant food such as cup noodles poured into boiling water and eaten. In addition, instead of pouring hot water, it is also suitable as a container for instant food, in which water is poured into a microwave oven.
[Brief description of the drawings]
FIG. 1 is a perspective view showing an easy-open non-metal container according to a first embodiment of the present invention.
FIG. 2 is a plan view showing a lid of the easily-openable nonmetallic container of FIG. 1;
FIG. 3 is a plan view showing another example of a lid.
FIG. 4 is a cross-sectional view showing a basic layer configuration of a lid according to the present invention.
FIG. 5 is a sectional view showing another layer configuration of the lid of the present invention.
FIG. 6 is a schematic side view showing an example of an apparatus for producing a linear easily tearable thermoplastic resin film.
FIG. 7 is a schematic partial side view showing another example of an apparatus for manufacturing a linear easily tearable thermoplastic resin film.
FIG. 8 is a plan view showing a state in which a plurality of lids are punched from a laminated film.
FIG. 9 is a perspective view showing the easily-openable non-metal container of the first embodiment in which the lid is opened in a belt shape.
FIG. 10 is a graph showing the relationship between the initial opening strength of the lid of Example 1 and the heat sealing temperature.
FIG. 11 is a graph showing the relationship between the initial opening strength of the lid of Example 2 and the heat sealing temperature.
[Description of reference numbers]
1 ... Non-metal container body
11 ・ ・ ・ Opening edge
2 Lid
2a ... annular contact part
3 ... tab
4 ・ ・ ・ Tear start point (cut end)
5 ... rectangular opening
5a, 6a ... jagged fracture surface of paper layer
6 ... Strip flap
7 ... thermoplastic resin film
8 ... pattern roll
9 ... Nozzle
20 ... Laminated sheet
21 ・ ・ ・ Linear easily tearable thermoplastic resin film layer
22 ・ ・ ・ Non-metal layer (paper layer) giving dead hold property
23 ... light-shielding ink layer
24 ... Sealant film layer
25 ... adhesive layer
30 ・ ・ ・ Dried noodles
31 second tab
71 ・ ・ ・ Film source
72, 73: Nip roll
74, 75: Guide roll
76 ... take-up reel

Claims (13)

  1. (A) a non-metallic container main body containing contents, and (b) a laminated sheet having at least a linear easily tearable thermoplastic resin film layer, a non-metal layer with a dead hold property and a sealant film layer, A lid that is heat-sealed through the sealant film at the opening edge of the container body,
    (I) The sealant film is obtained by copolymerizing ethylene and an α-olefin having 3 to 18 carbon atoms, and has a density of 0.870 to 0.910 g / cm 3 and an MFR (190 ° C., 2.16 kg). A resin composition containing a linear ethylene / α-olefin copolymer having a load of 1 to 100 g / 10 min and polystyrene,
    (Ii) The linear easily tearable thermoplastic resin film has a large number of substantially parallel linear marks formed on at least one surface, and tears substantially linearly along the linear marks. Can be
    (Iii) a tab is formed on one end of an outer peripheral edge of the lid, and a tear start point is formed on both sides of the tab;
    Then, when the tab is lifted, the lid is easily torn in a band shape from the tear start point to the other end of the outer peripheral edge, and the band-shaped flap portion formed by the tear remains substantially curled due to dead hold. Characteristic easy-opening non-metal container.
  2. 2. The easy-opening non-metallic container according to claim 1, wherein the linear easily tearable thermoplastic resin film is made of polybutylene terephthalate.
  3. The easy-opening non-metallic container according to claim 1 or 2, wherein the depth of the linear mark is 1 to 40% of the thickness of the linear easily tearable thermoplastic resin film. Non-metallic container.
  4. The easily-openable nonmetallic container according to any one of claims 1 to 3, wherein the depth of the linear mark is 0.1 to 10 µm, and the width of the linear mark is 0.1 to 10 µm, The easy-opening non-metal container, wherein the interval between the linear marks is 10 to 200 μm.
  5. The easy-opening nonmetallic container according to any one of claims 1 to 4, wherein the linear ethylene / α-olefin copolymer is polymerized using a metallocene compound as a polymerization catalyst. Easy-opening non-metal container.
  6. The easy-open non-metal container according to any one of claims 1 to 5, wherein a mixing ratio of the linear ethylene / α-olefin copolymer and the polystyrene is (linear ethylene / α-olefin copolymer). An easily-openable nonmetallic container, wherein the weight ratio of (polymer) :( polystyrene) is 50: 50 ° to 90:10.
  7. The easy-opening nonmetallic container according to claim 1, wherein the sealant film has an ethylene-based density of 0.910 to 0.940 g / cm 3 and an MFR of 1 to 50 g / 10 min. An easily-openable nonmetallic container comprising a resin composition further containing a resin.
  8. The easy-opening non-metallic container according to any one of claims 1 to 7, wherein the tear starting point is a cut or a notch provided on an outer peripheral edge of the lid. .
  9. The easy-opening non-metallic container according to any one of claims 1 to 8, wherein the dead-holding imparting non-metallic layer is made of paper.
  10. The easy-opening non-metallic container according to claim 9, wherein a light-shielding ink layer is provided on the paper layer.
  11. The easy-opening non-metallic container according to any one of claims 1 to 10, wherein the non-metallic container main body is made of paper and has a sealing surface on which a polyethylene resin layer is laminated. container.
  12. The easy-opening non-metallic container according to any one of claims 1 to 10, wherein at least a sealing surface of the non-metallic container main body is made of polystyrene.
  13. An instant food product stored in the easily-openable non-metal container according to claim 1.
JP2002183197A 2002-06-24 2002-06-24 Easily unsealable non-metallic vessel and fast-food contained in the vessel Pending JP2004026190A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
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Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006052004A (en) * 2004-07-14 2006-02-23 Kagawa Atsuko Container sealing lid having superior easy-holdability and resealability
JP2007210676A (en) * 2006-01-10 2007-08-23 Kyodo Printing Co Ltd Cover material and its manufacturing process, and packaging material using this cover material
KR20130127296A (en) * 2012-05-14 2013-11-22 산·톡스 가부시키가이샤 A method for forming a peelable connecting structure
WO2018047233A1 (en) * 2016-09-06 2018-03-15 株式会社藤村工業 Sealed vessel and manufacturing method for same

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006052004A (en) * 2004-07-14 2006-02-23 Kagawa Atsuko Container sealing lid having superior easy-holdability and resealability
JP4658543B2 (en) * 2004-07-14 2011-03-23 加川 敦子 Container sealing lid with excellent opening retention and resealability
JP2007210676A (en) * 2006-01-10 2007-08-23 Kyodo Printing Co Ltd Cover material and its manufacturing process, and packaging material using this cover material
KR20130127296A (en) * 2012-05-14 2013-11-22 산·톡스 가부시키가이샤 A method for forming a peelable connecting structure
WO2018047233A1 (en) * 2016-09-06 2018-03-15 株式会社藤村工業 Sealed vessel and manufacturing method for same

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