WO2011148912A1 - 多層シート、熱成形容器、および、易開封性包装体 - Google Patents

多層シート、熱成形容器、および、易開封性包装体 Download PDF

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Publication number
WO2011148912A1
WO2011148912A1 PCT/JP2011/061794 JP2011061794W WO2011148912A1 WO 2011148912 A1 WO2011148912 A1 WO 2011148912A1 JP 2011061794 W JP2011061794 W JP 2011061794W WO 2011148912 A1 WO2011148912 A1 WO 2011148912A1
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WIPO (PCT)
Prior art keywords
mass
layer
surface layer
resin
multilayer sheet
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2011/061794
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English (en)
French (fr)
Japanese (ja)
Inventor
俊也 佐藤
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Idemitsu Unitech Co Ltd
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Idemitsu Unitech Co Ltd
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Publication date
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Priority to KR1020127030397A priority Critical patent/KR101848944B1/ko
Priority to CN201180025570.0A priority patent/CN102905897B/zh
Publication of WO2011148912A1 publication Critical patent/WO2011148912A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D77/00—Packages formed by enclosing articles or materials in preformed containers, e.g. boxes, cartons, sacks or bags
    • B65D77/10—Container closures formed after filling
    • B65D77/20—Container closures formed after filling by applying separate lids or covers, i.e. flexible membrane or foil-like covers
    • B65D77/2024—Container closures formed after filling by applying separate lids or covers, i.e. flexible membrane or foil-like covers the cover being welded or adhered to the container
    • B65D77/2028—Means for opening the cover other than, or in addition to, a pull tab
    • B65D77/2032—Means for opening the cover other than, or in addition to, a pull tab by peeling or tearing the cover from the container
    • B65D77/2044—Means for opening the cover other than, or in addition to, a pull tab by peeling or tearing the cover from the container whereby a layer of the container or cover fails, e.g. cohesive failure
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B1/00—Layered products having a non-planar shape
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
    • B32B27/306—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising vinyl acetate or vinyl alcohol (co)polymers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04—Interconnection of layers
    • B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D1/00—Rigid or semi-rigid containers having bodies formed in one piece, e.g. by casting metallic material, by moulding plastics, by blowing vitreous material, by throwing ceramic material, by moulding pulped fibrous material or by deep-drawing operations performed on sheet material
    • B65D1/22—Boxes or like containers with side walls of substantial depth for enclosing contents
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D65/00—Wrappers or flexible covers; Packaging materials of special type or form
    • B65D65/38—Packaging materials of special type or form
    • B65D65/40—Applications of laminates for particular packaging purposes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2250/00—Layers arrangement
    • B32B2250/05—5 or more layers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2250/00—Layers arrangement
    • B32B2250/24—All layers being polymeric
    • B32B2250/246—All polymers belonging to those covered by groups B32B27/32 and B32B27/30
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2270/00—Resin or rubber layer containing a blend of at least two different polymers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/724—Permeability to gases, adsorption
    • B32B2307/7242—Non-permeable

Definitions

  • the present invention relates to a multilayer sheet, a thermoformed container, and an easily openable package including the thermoformed container.
  • Patent Document 1 describes a layer A composed of 50 to 95 wt% of a polyolefin resin, 50 to 5 wt% of an ethylene / acrylic acid ester / maleic anhydride copolymer resin, and a layer B composed of a polypropylene resin.
  • stacked is taken.
  • the thickness dimension of the A layer is 5 to 500 ⁇ m.
  • Patent Document 2 employs a configuration using a film having a heat-sealing layer made of a low-density polyethylene composition of 99 to 55% by weight of low-density polyethylene and 1 to 45% by weight of a propylene polymer.
  • the one described in Patent Document 3 is a cover made of an olefin resin in a container made of a composite sheet having a mixed resin film of an olefin resin and a styrene resin as a first layer and a styrene resin sheet as a second layer.
  • fuses is taken.
  • Patent Document 4 describes that 50 to 83% by mass of polypropylene, 10 to 35% by weight of high density polyethylene having a density of 0.95 g / cm 3 or more and a melt flow rate of 10 to 100 g / 10 min, Using a composition containing 5 to 15% by weight of low-density polyethylene and 2 to 10% by weight of an ethylene / ⁇ -olefin copolymer having a density of 0.90 g / cm 3 or less, a skin for the sealing surface of the container The structure which forms a layer is taken.
  • the material described in Patent Document 5 is a thermoplastic comprising a polypropylene having a melting point of 128 to 140 ° C.
  • an object of the present invention is to provide a multilayer sheet, a thermoformed container, and an easy-open packaging body that can be easily molded and have stable sealing performance.
  • the multilayer sheet according to the present invention is a multilayer sheet formed by laminating at least two layers of a surface layer and a surface lower layer provided adjacent to the surface layer, and the surface layer is made of polypropylene. 30% to 70% by mass of a resin, 10% to 30% by mass of a propylene-ethylene random copolymer having a melting point of 130 ° C. or less, and 20% to 40% of a low density polyethylene resin having a melting point of 120 ° C. or more.
  • the upper and lower surface layers are mainly composed of a polypropylene-based resin having an isotactic pentad fraction of 93 mol% or more.
  • the said surface lower layer contains 80 mass% or more of polypropylenes whose isotactic pentad fraction is 93 mol% or more. Furthermore, in the present invention, when the content of polypropylene having an isotactic pentad fraction of 93 mol% or more is less than 80% by mass, the front and lower layers contain talc in an amount of 0.5% by mass to 5% by mass. It is preferable to do.
  • the surface layer preferably has a thickness dimension of 10 ⁇ m to 150 ⁇ m.
  • thermoformed container according to the present invention is a thermoformed container having an opening obtained by thermoforming the multilayer sheet according to the present invention, and extends outward at the periphery of the opening. A flange portion is formed, and the surface layer is formed on the inner surface side of the thermoformed container.
  • An easy-open packaging body includes the thermoformed container according to the present invention, and a lid member that is fused to a flange portion of the thermoformed container and closes the opening.
  • the said cover material has a sealant layer in the surface fuse
  • the surface layer having the above-described composition can prevent the resin from adhering to the heating plate of the direct heating molding machine, for example, when the container is continuously molded, and can easily set the molding conditions widely. Can be molded. Furthermore, since the above-described composition is used as the upper and lower layers laminated adjacent to the surface layer, for example, when the lid material is fused to the container, it is possible to prevent inconvenience such as excessive penetration of the jig to be fused, and stable. It can be manufactured in a fused state, can prevent the seal strength from varying, and can provide stable sealing characteristics.
  • FIG. 1 It is a perspective view which shows schematic structure sealed with the cover material in the easy-open packaging body which concerns on one Embodiment of this invention. It is a perspective view which shows the state which opened the cover material in the easy-open packaging body of this embodiment. It is a fragmentary sectional view of the opening start part in the easy-open packaging body of this embodiment. It is sectional drawing which shows the multilayer sheet which forms the thermoforming container in the easy-open packaging body of this embodiment. It is a schematic diagram which shows the melt
  • FIG. 1 is a perspective view showing a schematic configuration sealed with a lid in the easy-open packaging body of the present embodiment.
  • FIG. 2 is a perspective view showing a state in which the lid member in the easy-open packaging body of the present embodiment is opened.
  • FIG. 3 is a partial cross-sectional view of an opening start portion in the easy-open packaging body of the present embodiment.
  • FIG. 4 is a cross-sectional view showing a multilayer sheet forming a thermoformed container in the easy-open packaging body of the present embodiment.
  • the easy-open packaging body 1 packages various articles such as foods, medicines, cosmetics, sundries, etc., regardless of the form of liquid or solid.
  • the easy-open packaging body 1 includes a thermoformed container 2 and a lid 3.
  • thermoformed container 2 has an opening 21 on the upper surface and a storage portion 23 that forms a storage space 22 for storing an article (not shown) inside, and is formed in a substantially rectangular tray shape. On the periphery of the opening 21 of the storage portion 23, a series of flange portions 24 extending outwardly in a bowl shape are provided. As shown in FIG. 3, the thermoformed container 2 includes a base material layer 25, a surface lower layer 26 laminated adjacent to the base material layer 25, and a cohesive fracture property laminated adjacent to the surface lower layer 26. It is a laminate having a surface layer 27.
  • thermoforming container 2 is obtained by heat-molding the multilayer sheet 20 with a molding machine such as a direct hot plate heating molding machine in a state where the surface layer 27 faces the inner surface side of the storage unit 23.
  • a molding machine such as a direct hot plate heating molding machine in a state where the surface layer 27 faces the inner surface side of the storage unit 23.
  • molding method not only a direct hot plate heating system but various shaping
  • the multilayer sheet 20 has a laminated structure in which a base material layer 25, a surface lower layer 26, and a surface layer 27 are laminated.
  • the base material layer 25 has a structure in which a first base material layer 25A, a first adhesive layer 25B, a gas barrier layer 25C, a second adhesive layer 25D, and a second base material layer 25E are sequentially laminated.
  • a polypropylene resin, a polyethylene resin, a polyamide resin, a polyethylene terephthalate resin, or the like can be used for the first base material layer 25A and the second base material layer 25E, but is not limited thereto.
  • the thickness dimensions of the first base material layer 25A and the second base material layer 25E are 100 ⁇ m or more and 2000 ⁇ m or less, and preferably 200 ⁇ m or more and 1000 ⁇ m or less.
  • an unsaturated carboxylic acid or a derivative-modified polyolefin resin thereof can be used for the first adhesive layer 25B and the second adhesive layer 25D, but a polyvinylidene chloride resin may be used.
  • the gas barrier layer 25C it is preferable to use materials such as polyamide resin, polyethylene terephthalate resin, ethylene-vinyl alcohol resin, and polyvinylidene chloride. Among them, ethylene-vinyl alcohol resin is preferably used.
  • the base material layer 25 may further contain an additive such as a dispersant, a pigment, or a dye.
  • a dispersant examples include glycerin fatty acid ester monoglyceride, sorbitan fatty acid ester, and polyglycerin fatty acid ester.
  • content of a dispersing agent is 1 to 8 mass%, Preferably they are 2 to 5 mass%.
  • the surface lower layer 26 contains a polypropylene resin having an isotactic pentad fraction of 93 mol% or more, preferably 97 mol% or more as a main component.
  • the surface lower layer 26 may contain various polyolefin-based resins, polystyrene-based resins, polyester-based resins, mixtures thereof, and the like in addition to the polypropylene-based resins.
  • As the polypropylene resin homopolypropylene, random polypropylene or the like is used alone or in appropriate combination.
  • the content of the polypropylene resin is 60% by mass or more and 90% by mass or less, preferably 65% by mass or more and 85% by mass or less, and more preferably 80% by mass or more and 85% by mass or less.
  • the content of the polypropylene-based resin is less than 60% by mass, there is a risk that an excessive bite is likely to occur during sealing.
  • the content of the polypropylene-based resin is more than 90% by mass, there is a possibility that the thermoforming container 2 is liable to be cracked.
  • the front lower layer 26 preferably contains 80% by mass or more of polypropylene having an isotactic pentad fraction of 93 mol% or more.
  • polypropylene having an isotactic pentad fraction of 93 mol% or more is contained in the lower surface layer 26 in an amount of less than 80 mass%, particularly 65 mass% or more and less than 80 mass%, talc is contained in an amount of 0.5 mass% or more and 5 mass% or less. It is preferable to contain it below.
  • the talc is less than 0.5% by mass, the biting stability at the time of sealing may be deteriorated.
  • the talc content is more than 5% by mass, it is necessary to increase the heating temperature at the time of thermoforming, and there is a possibility of adhering to the hot plate of the molding machine.
  • the surface lower layer 26 may contain additives, such as a dispersing agent, a pigment, or a dye, similarly to the base material layer 25.
  • the front lower layer 26 is set to 93 mol% or more because excessive biting tends to occur during sealing.
  • the measurement of the isotactic pentad fraction used as an index of stereoregularity is, for example, A. Examples thereof include a method based on a 13 C-NMR method (Macromolecules, 6925, 1973) disclosed by Zambelli.
  • the isotactic pentad fraction has 9 types of bond patterns of five propylene molecules (“mmmm”, “mmmr”, “rmmr”, “mmrr”, “rmrr + mrmm”, “ rmrm “,” rrrr “,” mrrrr “,” mrrrm ”) corresponding to each of the nine peaks observed as 13 C-NMR spectra, the peak area corresponding to" mmmm " Defined as relative ratio.
  • the surface layer 27 is made of a resin composition containing a polypropylene resin, a propylene-ethylene random copolymer having a melting point of 130 ° C. or lower, and a low density polyethylene resin having a melting point of 120 ° C. or higher.
  • a polypropylene resin homopolypropylene, random polypropylene, block polypropylene and the like are used alone or in appropriate combination.
  • the polypropylene-based resin those having a melt flow rate of 0.3 g / 10 min or more and 0.8 g / 10 min or less, preferably 0.4 g / 10 min or more and 0.7 g / 10 min or less are used.
  • melt flow rate is smaller than 0.3 g / 10 min, the surface layer 27 may not be spread uniformly. On the other hand, if the melt flow rate is greater than 0.8 g / 10 min, the dispersibility may be impaired.
  • content of a polypropylene resin is 30 to 70 mass%, Preferably it is 40 to 50 mass%. When the content of the polypropylene resin is less than 30% by mass, the adhesion with the lid member 3 is weak, and the adhesion may be deteriorated or the heat resistance may be deteriorated. On the other hand, when the content of the polypropylene resin is more than 70% by mass, the adhesiveness becomes too strong, and the openability may be deteriorated.
  • the content of the propylene-ethylene random copolymer having a melting point of 130 ° C. or less is 10% by mass or more and 30% by mass or less, preferably 15% by mass or more and 25% by mass or less.
  • the propylene-ethylene random copolymer one having a melt flow rate of 0.5 g / 10 min to 3 g / 10 min, preferably 1.5 g / 10 min to 2.5 g / 10 min is used. If the melt flow rate is less than 0.5 g / 10 min, the surface layer 27 may be difficult to spread uniformly. On the other hand, when the melt flow rate is greater than 3 g / 10 min, the dispersibility may be impaired.
  • the melting point of the propylene-ethylene random copolymer is higher than 130 ° C., the sealing property with the lid 3 may be weakened. Therefore, the melting point of the propylene-ethylene random copolymer is 130 ° C. or lower, preferably 120 ° C. or higher and 130 ° C. or lower. Further, when the content of the propylene-ethylene random copolymer is less than 10% by mass, the sealing property with the lid member 3 may be weakened. On the other hand, if the content of the propylene-ethylene random copolymer is more than 30% by mass, the sealing property with the lid member 3 may be too strong.
  • the content of the low-density polyethylene resin having a melting point of 120 ° C. or higher is 20% by mass or more and 40% by mass or less, preferably 25% by mass or more and 35% by mass or less.
  • the low density polyethylene-based resin those having a melt flow rate of 3.5 g / 10 min or more and 6.5 g / 10 min or less, preferably 4 g / 10 min or more and 5 g / 10 min or less are used. If the melt flow rate is less than 3.5 g / 10 min, the dispersed state may be impaired. On the other hand, when the melt flow rate is larger than 6.5 g / 10 minutes, the dispersion state may be impaired.
  • the low-density polyethylene resin has a melting point lower than 120 ° C., it may be attached to the heating plate by a direct heating type molding machine. For this reason, the melting point of the low-density polyethylene resin is 120 ° C. or higher, preferably 120 ° C. or higher and 130 ° C. or lower.
  • content of a low density polyethylene-type resin becomes less than 20 mass%, there exists a possibility that adhesiveness with the cover material 3 may become strong too much and unsealing property may deteriorate.
  • the content of the low density polyethylene resin is more than 40% by mass, the adhesiveness with the lid member 3 may be greatly changed.
  • the surface layer 27 may further contain an additive such as a dispersant, a pigment, or a dye, as in the case of the base material layer 25 and the surface lower layer 26.
  • the surface layer 27 is preferably formed with a thickness of 10 ⁇ m to 150 ⁇ m, particularly 15 ⁇ m to 100 ⁇ m. If the thickness dimension of the surface layer 27 is thinner than 10 ⁇ m, it is difficult to control the thickness dimension, the productivity may be deteriorated, and the surface layer 27 may be rejected during fusion. On the other hand, if the thickness dimension of the surface layer 27 is thicker than 150 ⁇ m, the cohesive failure surface is not stable, and there is a possibility that an appearance defect may occur at the time of opening.
  • the multilayer sheet 20 is shape
  • the lid 3 includes an outer layer 31 that appears outside the easy-open packaging body 1, a sealant layer 32 that is fused to the surface layer 27 of the thermoformed container 2, and the outer layer 31 and the sealant layer. It is a laminated body having an intermediate layer 33 interposed between 32.
  • the sealant layer 32 of the lid member 3 to be fused with the surface layer 27 of the thermoforming container 2 is an unsealing mode in which the surface layer 27 of the thermoforming container 2 is agglomerated and peeled off (see FIG. 8). Specifically, as shown in FIGS.
  • the opening start portions 34 of the lid 3 provided at the four corners of the easy-open packaging body 1 are separated from the flange portions 24 of the thermoforming container 2 (see FIG. 1).
  • the surface layer 27 is agglomerated and peeled off, and the easy-open packaging body 1 is opened.
  • a polyethylene terephthalate (PET) film, a biaxially stretched nylon film (O—Ny), or the like can be used.
  • the intermediate layer 33 is preferably made of, for example, a polyamide resin, a polyethylene terephthalate resin, an ethylene-vinyl alcohol resin, or polyvinylidene chloride.
  • the sealant layer 32 is preferably made of, for example, polypropylene resin or polyethylene resin.
  • the easy-open packaging body 1 has a ring material as shown in FIGS. 1 and 2 in which a lid 3 is fused to a thermoformed container 2 formed from the multilayer sheet 20 described above.
  • a seal portion 28 is formed.
  • the seal portion 28 includes a first annular seal portion 281 formed by the first annular seal disc 7 and a second annular seal portion 282 formed by the second annular seal disc 7a. Formed with.
  • a bump-shaped resin reservoir portion is formed in the vicinity of the inner peripheral edge (position X in FIG. 3) of the annular first annular seal portion 281 on the flange portion 24. 6 is formed.
  • the resin reservoir 6 is formed such that the surface lower layer 26, the surface layer 27 of the thermoforming container 2, and the sealant layer 32 of the lid 3 are pushed out to the opening edge side of the opening 21 of the thermoforming container 2.
  • the resin reservoir 6 includes the first resin reservoir 61 of the surface layer 27 of the thermoforming container 2, the second resin reservoir 62 of the front and lower layer 26, and the sealant layer of the lid member 3. 32 third resin reservoirs 63 are formed together.
  • the easy-open packaging body 1 in an unsealed form in which the surface layer 27 of the thermoformed container 2 is agglomerated and peeled is provided with such a resin reservoir portion 6 so that it has a high sealing property as a packaging container and is agglomerated and peeled. Easy-openability can be maintained in a good state by the opening form. Furthermore, in the easy-open packaging body 1, the lid 3 and the flange portion 24 of the thermoformed container 2 are easily cut by the resin reservoir 6. In addition, the easy-open packaging body 1 has improved sealing properties because the direction in which stress due to internal pressure is applied differs from the direction in which easy opening due to cohesive failure occurs.
  • the stress of the internal pressure is applied from the vicinity of the inner peripheral edge X of the first annular seal portion 281 to the concave portion of the base in the first resin reservoir 61 and the second resin reservoir 62 (position Y in FIG. 3). It is easy to act, it is difficult to open depending on the stress of the internal pressure, and the sealing performance is improved.
  • the resin reservoir portion 6 is formed on the entire circumference in the vicinity of the inner peripheral edge X of the annular first annular seal portion 281 on the upper surface of the flange portion 24 of the thermoformed container 2.
  • the outer peripheral edge of the annular first annular seal portion 281 in the opening start portion 34 of the thermoformed container 2 is flat or resin smaller than the resin reservoir 6 in the vicinity of the inner peripheral edge X of the first annular seal portion 281. Only a pool is formed.
  • the portion other than the opening start portion 34 is substantially the same as the resin reservoir portion 6 in the vicinity of the inner peripheral edge X of the first annular seal portion 281 on the entire outer periphery of the annular first annular seal portion 281. You may form the resin reservoir part which a magnitude
  • FIG. 5 is a schematic view showing a lid material fusion process in the case of manufacturing the easy-open packaging body according to the present embodiment.
  • FIG. 6 is a partial cross-sectional view showing a state of the first annular seal disc and the flange portion at the time of fusion in the present embodiment.
  • FIG. 7 is a partially enlarged view of the first annular seal disc in the present embodiment.
  • the easy-open packaging body 1 In manufacturing the easy-open packaging body 1, in order to make the easy-open packaging body 1 in a sealed state by fusing the flange portion 24 and the lid material 3 of the thermoforming container 2, The lid member 3 is overlaid on the flange portion 24. Then, heat sealing is performed by pressing the heated first annular sealing disk 7 from the upper surface of the lid 3. In order to form the knob-shaped resin reservoir 6 near the inner periphery X of the seal portion of the opening start portion 34 as described above, for example, the following method may be used.
  • the heat seal between the flange portion 24 of the thermoformed container 2 and the lid material 3 is performed by superimposing the lid material 3 on the flange portion 24 of the thermoformed container 2 and heating the lid material 3 from above.
  • the first annular sealing disc 7 in the state is pressed in the direction of the arrow in FIG. By this pressing, the surface layer 27 appearing on the flange portion 24 of the thermoforming container 2 and the sealant layer 32 of the lid member 3 are fused.
  • annular sealing board 7 used in order to manufacture the easy-open packaging body 1 of this embodiment, R process is given to the inner periphery with respect to the upper surface of the flange part 24, and an outer periphery is
  • the first annular seal disc 7 having a shape that is adapted to come into contact with the lid member 3 with a delay from the tip end of the first annular seal disc 7 (tip 73 in FIG. 7).
  • the first annular seal disc 7 has an inclined surface portion 71 having an inclined cross section on the outer peripheral edge side and an inner peripheral edge side via the boundary A (also the tip 73 of the first annular seal disc 7).
  • R is processed and a curved surface portion 72 having a curved cross section is continuously formed.
  • the inclined surface portion 71 formed on the outer peripheral edge side of the first annular seal disc 7 is formed from the inner peripheral edge toward the outer peripheral edge with respect to the surface of the flange portion 24 as shown in FIG.
  • the angle ( ⁇ ) is preferably set to 2 ° to 20 °, particularly 3 ° to 15 °.
  • the angle of the inclined surface portion 71 is appropriately set according to the width H of the first annular seal disc 7. If the angle of the inclined surface portion 71 is smaller than 2 °, the resin reservoir portion 6 as shown in FIG. 3 is easily formed in the vicinity of the outer peripheral edge of the seal portion 28 even when pressed at the time of fusion. The resistance on the outside of the seal portion 28 at the time of opening increases, and it may be difficult to perform opening smoothly.
  • the angle of the inclined surface portion 71 exceeds 20 °, the periphery of the boundary A is gently pointed, and the lid member 3 may be cut at the time of fusing or opening, so that easy-openability is impaired. There is a risk of being.
  • the radius of curvature R is about 0.2Hmm or more and 0.5Hmm or less in the R processing applied to the curved surface portion 72 formed on the inner peripheral edge side of the first annular seal disc 7.
  • the radius of curvature R of the curved surface portion 72 is appropriately set according to the width dimension H of the first annular seal disc 7 as shown by multiplying this numerical range. If the radius of curvature R of the curved surface portion 72 is smaller than 0.2 Hmm, the periphery of the boundary A will be gently sharpened, and the lid 3 may be cut during fusion or opening. On the other hand, when the radius of curvature R exceeds 0.5 Hmm, the resin reservoir 6 is hardly formed in the vicinity of the inner peripheral edge X of the seal portion 28 of the flange portion 24 even when pressed at the time of fusion.
  • the inclined surface portion 71 and the curved surface portion 72 are such that the boundary A is closer to the inner side (close to the inner peripheral edge) than the cross-sectional width direction of the first annular seal disc 7. Preferably it is formed. If the boundary A is inside with respect to the cross-sectional width direction of the first annular seal disc 7, the curved surface portion 72 is provided on the inner peripheral side of the first annular seal disc 7, and the inclined surface portion 71 is provided on the outer peripheral side of the first annular seal disc 7. Combined with the formation, the tip 73 comes into contact with the lid 3 first from the outer peripheral edge side of the first annular seal disc 7 at the time of fusion.
  • the resin reservoir 6 is selectively formed on the inner side with respect to the opening 21 side on the inner peripheral edge side in contact with the tip.
  • it corresponds to parts other than the opening start part 34 of the thermoforming container 2, and is rounded to the entire circumference of the inner peripheral edge and the outer peripheral edge of the first annular seal disc 7 and has a curved cross section. A portion 72 is formed. And the site
  • the first annular seal disc 7 is formed by continuously forming the inclined surface portion 71 and the curved surface portion 72 in an annular manner so as to integrally form a circumferential seal portion 28 as shown in FIGS. 1 and 2.
  • An annular sealing disc (seal ring) may be used.
  • the first annular seal disc 7 may be an annular seal disc (seal ring) in which the inclined surface portion 71 and the curved surface portion 72 are formed only for the portion corresponding to the opening start portion 34 of the easy-open packaging body 1. Good.
  • the resin component of the surface layer 27 of the thermoforming container 2 and the surface lower layer 26 adjacent to the surface layer 27 is extruded from the lower part of the boundary A to the inside of the thermoforming container 2, and the first in the flange portion 24.
  • Bump-like resin reservoirs 61 and 62 are formed in the vicinity of the position where the inner peripheral edge of the annular seal disc 7 is in contact, that is, in the vicinity of the inner peripheral edge X of the seal portion 28 of the thermoformed container 2.
  • the sealant layer 32 of the lid 3 also follows to form a resin reservoir 63, and in a state where these form the resin reservoir 6, the surface layer 27 appearing on the flange portion 24 of the thermoforming container 2, and the lid 3 sealant layers 32 are fused.
  • the fusing temperature may be appropriately determined depending on the type of material to be fused, but may be about 160 ° C. or higher and 240 ° C. or lower.
  • the fusion pressure may be about 10 kg / cm 2 (100 to 500 kPa) or more and 50 kg / cm 2 (100 to 500 kPa) or less.
  • the sealant layer 32 of the lid member 3 is fused to the surface layer 27 of the flange portion 24 while forming the above-mentioned knob-shaped resin reservoir portion 6 by the first annular seal disc 7.
  • the second annular seal disc 7a is used to press the outer peripheral side of the seal portion 28 so that the surface layer 27 of the thermoformed container 2 and the sealant layer 32 of the lid 3 are fused. Good.
  • the sealing surface of the second annular sealing disk 7a is a smooth flat shape or an R shape, the positional relationship between the resin reservoir 6 and the second annular sealing disk 7a need not be considered. However, when the sealing surface of the second annular sealing disk 7a is processed so that partial adhesion is possible, such as knurls, the unsealed appearance may be impaired due to the crushed resin reservoir 6 being crushed into irregularities. Therefore, it is preferable to prevent the second annular seal disc 7a from hitting the resin reservoir 6.
  • FIG. 8 is a cross-sectional view showing a state in which the easy-open packaging body of the present embodiment is initially opened.
  • FIG. 9 is a cross-sectional view showing a state where the easy-open packaging body of the present embodiment is completely opened.
  • the “initially opened state” refers to a state where the peeled and peeled surface does not reach the resin reservoir 6.
  • thermoforming container 2 follows the shape of the resin reservoir 63 formed in the sealant layer 32 of the lid member 3.
  • the thermoforming container 2 and the lid member 3 in the easy-open packaging body 1 are easily opened.
  • the multilayer sheet 20 that forms the thermoformed container 2 of the easy-open packaging body 1 has a polypropylene resin as the surface layer 27 of 30% by mass to 70% by mass and a melting point of 130 ° C. or less.
  • the ethylene random copolymer contains 10% by mass or more and 30% by mass or less, and the low-density polyethylene resin having a melting point of 120 ° C. or more contains 20% by mass or more and 40% by mass or less.
  • the melting start temperature at the time of fusing the lid 3 to the thermoforming container 2 becomes about 120 ° C. or higher and 130 ° C.
  • the fusion temperature can be set at 160 ° C. or higher and 240 ° C. or lower.
  • the fusion temperature can be set at a higher temperature and a wider temperature range than conventional materials. Therefore, the thermoformed container 2 can be efficiently manufactured without causing inconvenience such as the surface layer 27 of the multilayer sheet 20 adhering to the hot plate of the molding machine.
  • a polypropylene resin having an isotactic pentad fraction of 93 mol% or more is a main component.
  • the rigidity of the upper and lower layers 26 is improved, and excessive flow of the upper and lower layers 26 when the first annular seal disc 7 is pressed when the lid 3 is fused to the thermoforming container 2 can be prevented.
  • the fluidity of the surface layer 27 can be stabilized. For this reason, there is no inconvenience that the first annular sealing disk 7 bites excessively at the time of fusion, and a stable sealing strength can be obtained and a stable sealing performance can be provided.
  • a stable and good resin reservoir portion 6 can be formed, a stable sealing property can be obtained, and a stable sealing property can be provided.
  • the polypropylene of the isotactic pentad fraction 93 mol% contained in the surface lower layer 26 is 80 mass% or more. For this reason, it is possible to prevent excessive biting at the time of sealing and to seal well.
  • the isotactic pentad fraction 93 mol% of polypropylene contained in the lower surface layer 26 is less than 80 mass%, particularly 65 mass% or more and less than 80 mass%, talc is 0.5 mass% or more. It is contained at 5% by mass or less. For this reason, the rigidity of the surface lower layer 26 can be improved, and the thermoformed container 2 can have rigidity.
  • the thickness dimension of the surface layer 27 of the multilayer sheet 20 is 10 ⁇ m or more and 150 ⁇ m or less. Therefore, the surface layer 27 having a stable thickness can be formed, the yield can be improved, and the surface layer 27 can be satisfactorily sealed without being eliminated during fusion. Furthermore, the cohesive failure surface can be stabilized and the unsealed appearance can be prevented from being impaired.
  • thermoformed container 2 having the flange portion 24 extending outward at the periphery of the opening 21 is positioned on the inner surface side, that is, the surface layer 27 is positioned on the inner surface side of the storage portion 23.
  • the multilayer sheet 20 is formed by thermoforming the layer 27 to face. For this reason, what is necessary is just to melt
  • the sealant layer 32 of the lid member 3 is fused to the flange portion 24 of the easy-open packaging body 1, and the resin reservoir portion 6 is formed in the vicinity of the opening portion 21 side of the flange portion 24. .
  • the stress that peels due to the presence of the resin reservoir 6 acts in the direction of pulling the lid 3 away from the thermoforming container 2.
  • cover material 3 and the flange part 24 of the thermoforming container 2 are cut
  • the surface lower layer 26 and the sealant layer 32 of the lid member 3 that are hard to coagulate and break are present on both sides of the surface layer 27 that cohesively break, the sealing performance can be improved.
  • the configuration including the surface layer 27, the upper and lower layers 26, and the base material layer 25 has been shown, but is not limited thereto.
  • the base material layer 25 may not be provided, and the front surface layer 27 and the front / lower layer 26 may be used. That is, it is good also as a structure which the surface lower layer 26 functions as a base material layer.
  • the multilayer sheet 20 and the base material layer 25 of the thermoforming container 2 of the present embodiment include a first base material layer 25A, a first adhesive layer 25B, a gas barrier layer 25C, a second adhesive layer 25D, and a second base material layer 25E.
  • the base material layer 25 may be configured by only the first base material layer 25A.
  • the multilayer sheet 20 and the thermoforming container 2 may have a multilayer configuration of two or more layers including at least the surface layer 27 and the front and lower layers 26.
  • the sealant layer 32 of the lid member 3 is made of the same material as that of the surface layer 27 of the multilayer sheet 20, and the intermediate layer 33 of the lid member 3 is made of the same material as that of the upper and lower layers 26 of the multilayer sheet 20.
  • the sealant layer 32 of the lid 3 may be fused to the flange portion 24 of the thermoforming container 2.
  • the sealant layer 32 of the lid member 3 is agglomerated and peeled when the thermoforming container 2 and the lid member 3 are opened. Further, when opening, both the surface layer 27 of the thermoforming container 2 and the sealant layer 32 of the lid member 3 may be coherently broken and opened.
  • the multi-layer sheet of the present invention may be applied to various shapes of the package, in addition to the easy-open package 1 including the thermoformed container 2 and the lid 3 described above.
  • a resin reservoir may be formed at a portion corresponding to a position where the peripheral edge contacts.
  • the resin reservoir portion 6 formed on the inner peripheral edge is larger than the resin reservoir formed on the outer peripheral edge, good easy-openability and high sealability are maintained.
  • the thickness dimension of the surface layer 27 may not be 10 ⁇ m or more and 150 ⁇ m or less. The thickness dimension can be appropriately set according to the application.
  • Multilayer sheet The multilayer sheet is manufactured by using a commonly used distributor type co-extrusion multilayer sheet manufacturing apparatus, and the following surface layer / first base layer / first adhesive layer / gas barrier layer / second adhesive layer / A multilayer sheet comprising the second substrate layer was produced.
  • First base layer surface lower layer
  • second base layer appropriately set for each example and comparative example described below
  • First adhesive layer Adhesive resin (manufactured by Mitsubishi Chemical Corporation, maleic anhydride modified PP (trade name: Modic AP P604V))
  • Gas barrier layer ethylene-vinyl alcohol copolymer resin (manufactured by Kuraray (trade name: EVAL J171B)) (Thermoforming container)
  • a direct hot plate heating type molding machine manufactured by Shinwa Machine Co., Ltd. (trade name: direct heating type container molding machine) was used for both the upper and lower hot plates at 200 ° C.
  • thermoformed container was formed by thermoforming three times. (Cover material) It was molded into a three-layer laminate of outer layer / intermediate layer / sealant layer described below.
  • Outer layer Polyethylene terephthalate (Mitsubishi Chemical Corporation (trade name: Tech Barrier)) 12 ⁇ m
  • Intermediate layer Nylon (made by Idemitsu Unitech Co., Ltd. (trade name: UNILON S)) 15 ⁇ m
  • Sealant layer LLPE (made by Idemitsu Unitech Co., Ltd. (product name: LS700C)) 60 ⁇ m or polypropylene (PP) (made by Idemitsu Unitech Co., Ltd.
  • the shape of the flange of the formed thermoformed container was appropriately formed into a flat shape or a convex shape using a ring-shaped sealing board, a convex sealing board, an R sealing board, or a special-shaped sealing board.
  • the used sealing board is as follows.
  • the ring-shaped sealing discs of Examples 1 to 7 and each comparative example have a width of 1.5 mm and a flat tip shape.
  • the fusing temperature is 190 ° C.
  • the fusing pressure is 150 kg / piece
  • the fusing time is 1.0 second.
  • the convex sealing disk of Example 8 has a width of 3.0 mm and a flat tip shape.
  • the fusing temperature is 190 ° C., the fusing pressure is 150 kg / piece, and the fusing time is 1.0 second.
  • the R-seal disc of Example 9 has a curved surface with a width of 1.5 mm and a curvature radius of 1.0 mm at the tip protruding at the center in the width direction.
  • the fusing temperature is 210 ° C., the fusing pressure is 200 kg / piece, and the fusing time is 1.0 second.
  • the specially shaped seal disc of Example 10 has the same shape as the first annular seal disc 7, the width is 1.5 mm, the inclination angle ⁇ is 9 °, and the curved surface machining has a distance ratio radius of 0.5 mm.
  • the fusing temperature is 210 ° C., the fusing pressure is 200 kg / piece, and the fusing time is 1.0 second.
  • Example 1 In Example 1, as shown in Table 1 below, the surface layer and the first base material layer were formed with the following resin composition.
  • Surface layer (thickness 50 ⁇ m): Polypropylene (PP) (Prime Polymer Co., Ltd. (trade name: E105GM)) 40% by mass + Metallocene PP (manufactured by Nippon Polypro Co., Ltd. (trade name: WFX6 melting point 128 ° C.)) 30% by mass + Low density polyethylene (LDPE) (manufactured by Tosoh Nickemi Co., Ltd.
  • PP Polypropylene
  • E105GM Prime Polymer Co., Ltd.
  • Metallocene PP manufactured by Nippon Polypro Co., Ltd. (trade name: WFX6 melting point 128 ° C.)
  • LDPE Low density polyethylene
  • First base material layer Polypropylene (PP) (manufactured by Prime Polymer Co., Ltd. (trade name: V300SVE, stereoregularity ii97 mol%)) 81.5% by mass + Low density polyethylene (LDPE) (Nippon Polyethylene Co., Ltd. (trade name: HE30)) 13.5% by mass + 5% by mass of high density polyethylene (HDPE) (manufactured by Prime Polymer Co., Ltd. (trade name: 6203B)) As described above, the flange portion was formed flat using a ring-shaped seal disc.
  • PP Polypropylene
  • LDPE Low density polyethylene
  • HDPE high density polyethylene
  • Example 1-1 the thermoformed container was the multilayer sheet of Example 1 above, and the sealant layer of the lid was formed of the above-described polypropylene (PP).
  • Example 1-2 the thermoformed container was the multilayer sheet of Example 1 described above, and the sealant layer of the lid material was formed of the above-described LLPE.
  • Example 2 In Example 2, as shown in Table 1 below, the surface layer was formed with the same composition and thickness as Example 1, and the first base material layer was formed with the following resin composition.
  • First base material layer 68% by mass of polypropylene (PP) (manufactured by Prime Polymer Co., Ltd. (trade name: V300SVE, stereoregularity ii 97 mol%)) + 14% by mass of high density polyethylene (HDPE) (manufactured by Prime Polymer Co., Ltd. (trade name: 6203B)) + Thermoplastic elastomer (Tokyo Materials Co., Ltd. (trade name: Engage 8200)) 15% by mass + Talc (Idemitsu Lion Composite Co., Ltd. (trade name: HMP460-1)) 3% by mass
  • the flange portion was formed flat using a ring-shaped seal disc. Others were the same as in Example 1.
  • Example 3 In Example 3, as shown in Table 1 below, the surface layer was formed with the following resin composition, and the first base material layer was formed with the same composition as Example 1.
  • Surface layer Polypropylene (PP) (same material as in Example 1) 50% by mass + Metallocene PP (same material as Example 1) 20% by mass + Low density polyethylene (LDPE) (same material as Example 1) 30% by mass
  • PP Polypropylene
  • LDPE Low density polyethylene
  • Example 4 In Example 4, as shown in Table 1 below, the surface layer was formed with the following resin composition, and the first base material layer was formed with the same composition as Example 1.
  • Surface layer Polypropylene (PP) (same material as Example 1) 30% by mass + Metallocene PP (same material as Example 1) 30% by mass + Low density polyethylene (LDPE) (same material as in Example 1) 40% by mass
  • PP Polypropylene
  • LDPE Low density polyethylene
  • Example 5 In Example 5, as shown in Table 1 below, the surface layer was formed with the following resin composition, and the first base material layer was formed with the same composition as Example 1.
  • Surface layer Polypropylene (PP) (same material as in Example 1) 70% by mass + Metallocene PP (same material as Example 1) 10% by mass + Low density polyethylene (LDPE) (same material as in Example 1) 20% by mass
  • PP Polypropylene
  • LDPE Low density polyethylene
  • Example 6 In Example 6, as shown in Table 2 below, both the surface layer and the first base material layer had the same composition as in Example 1, and the thickness dimension of the surface layer was 150 ⁇ m. As described above, the flange portion was formed flat using a ring-shaped seal disc. Others were the same as in Example 1.
  • Example 7 In Example 7, as shown in Table 2 below, both the surface layer and the first base material layer had the same composition as Example 1, and the thickness dimension of the surface layer was 10 ⁇ m. As described above, the flange portion was formed flat using a ring-shaped seal disc. Others were the same as in Example 1.
  • Example 8 In Example 8, as shown in Table 2 below, both the surface layer and the first base material layer had the same composition as in Example 1, and the thickness dimension of the surface layer was 50 ⁇ m. As described above, the flange portion was formed in a convex cross section using a convex sealing disk. Others were the same as in Example 1.
  • Example 9 In Example 9, as shown in Table 2 below, both the surface layer and the first base material layer had the same composition as Example 1, and the thickness dimension of the surface layer was also formed to be the same as 50 ⁇ m. As described above, the flange portion was formed flat using an R seal disc. Others were the same as in Example 1.
  • Example 10 In Example 10, as shown in Table 2 below, both the surface layer and the first base material layer had the same composition as in Example 1, and the thickness dimension of the surface layer was also formed to 50 ⁇ m. As described above, the flange portion was formed in a flat shape using a specially shaped seal disc. Others were the same as in Example 1.
  • Example 11 was formed with the same formulation as Example 1 as shown in Table 3 below.
  • the surface layer was formed with a thickness of 160 ⁇ m.
  • Example 12 was formed with the same formulation as Example 1 as shown in Table 3 below.
  • the surface layer was formed with a thickness of 5 ⁇ m.
  • Example 13 In Example 13, as shown in Table 3 below, the surface layer was formed with the same composition as Example 1 and a thickness of 50 ⁇ m.
  • the first base material layer was formed with the following resin composition. Others were formed in the same manner as in Example 1.
  • First base material layer 75% by mass of polypropylene (PP) (manufactured by Prime Polymer Co., Ltd. (trade name: V300SVE stereoregularity ii 97 mol%)) + 20% by mass of high density polyethylene (HDPE) (manufactured by Prime Polymer Co., Ltd. (trade name: 6203B)) + 5% by mass of thermoplastic elastomer (manufactured by Tokyo Materials Co., Ltd. (trade name: Engage 8200))
  • PP polypropylene
  • HDPE high density polyethylene
  • 6203B thermoplastic elastomer
  • Example 14 In Example 14, as shown in Table 3 below, the surface layer had the same composition as in Example 1 and was formed to a thickness of 50 ⁇ m.
  • the first base material layer was formed with the following resin composition. Others were formed in the same manner as in Example 1.
  • First base material layer 75% by mass of polypropylene (PP) (manufactured by Prime Polymer Co., Ltd. (trade name: V300SVE stereoregularity ii 97 mol%)) + 10% by mass of high density polyethylene (HDPE) (manufactured by Prime Polymer Co., Ltd. (trade name: 6203B)) + 5% by mass of thermoplastic elastomer (manufactured by Tokyo Materials Co., Ltd. (trade name: Engage 8200)) + Talc (Idemitsu Lion Composite Co., Ltd. (trade name: HMP460-1)) 10% by mass
  • PP polypropylene
  • HDPE high density polyethylene
  • Engage 8200 thermoplastic elastomer
  • Talc Idem
  • Example 15 In Example 15, as shown in Table 3 below, the surface layer had the same composition as Example 1 and was formed to a thickness of 50 ⁇ m.
  • the first base material layer was formed with the following resin composition. Others were formed in the same manner as in Example 1.
  • First base material layer 75% by mass of polypropylene (PP) (manufactured by Prime Polymer Co., Ltd. (trade name: V300SVE stereoregularity ii 97 mol%)) + 20% by mass of high density polyethylene (HDPE) (manufactured by Prime Polymer Co., Ltd. (trade name: 6203B)) + 4.7% by mass of thermoplastic elastomer (Tokyo Material Co., Ltd. (trade name: Engage 8200)) + Talc (Idemitsu Lion Composite Co., Ltd. (trade name: HMP460-1)) 0.3% by mass
  • PP polypropylene
  • HDPE high density polyethylene
  • thermoplastic elastomer Tokyo Material Co., Ltd. (trade name: Engag
  • Comparative Example 1 In Comparative Example 1, as shown in Table 4 below, the surface layer was formed with the same composition and thickness as Example 1, and the first base material layer was formed with the following resin composition.
  • First base material layer 80% by mass of polypropylene (PP) (manufactured by Prime Polymer Co., Ltd. (trade name: E105GM stereoregularity ii92 mol%)) + Low density polyethylene (LDPE) (manufactured by Nippon Polyethylene Co., Ltd. (trade name: HE30)) 20% by mass
  • PP polypropylene
  • LDPE Low density polyethylene
  • the flange part was formed flat using the ring-shaped sealing disk.
  • Comparative Example 1-1 is similar to Example 1-1, in which the lid material whose sealant layer is the above-described polypropylene (PP) is fused to the thermoformed container formed of the multilayer sheet of Comparative Example 1. It was. Further, in Comparative Example 1-2, similarly to Example 1-2, the lid material whose sealant layer is the above-described LLPE is fused to the thermoformed container formed of the multilayer sheet of Comparative Example 1.
  • PP polypropylene
  • Comparative Example 2 In Comparative Example 2, as shown in Table 4 below, the surface layer was formed with the following resin composition to a thickness of 50 ⁇ m, and the first base material layer was formed with the same composition as Example 1, that is, polypropylene (PP). As for stereoregularity ii 97 mol% (manufactured by Prime Polymer Co., Ltd. (trade name: V300SVE)) was used. In addition, it formed similarly to the comparative example 1.
  • Comparative Example 3 In Comparative Example 3, as shown in Table 4 below, the surface layer was formed to a thickness of 50 ⁇ m with the following resin composition, and the first base material layer was formed with the same composition as Example 1. In addition, it formed similarly to the comparative example 1.
  • Surface layer Polypropylene (PP) (same material as Comparative Example 1) 70% by mass + Low density polyethylene (LDPE) (same material as Example 1) 30% by mass
  • Comparative Example 4 In Comparative Example 4, as shown in Table 4 below, the surface layer was formed to the thickness of 50 ⁇ m with the following resin composition, and the first base material layer was formed with the same composition as Example 1. In addition, it formed similarly to the comparative example 1.
  • Surface layer Polypropylene (PP) (same material as Comparative Example 1) 20% by mass + Metallocene PP (same material as Example 1) 50% by mass + Low density polyethylene (LDPE) (same material as Example 1) 30% by mass
  • PP Polypropylene
  • LDPE Low density polyethylene
  • Comparative Example 5 In Comparative Example 5, as shown in Table 5 below, the surface layer was formed to a thickness of 50 ⁇ m with the following resin composition, and the first base material layer was formed with the same composition as Example 1. In addition, it formed similarly to the comparative example 1.
  • PP Polypropylene
  • LDPE Low density polyethylene
  • Comparative Example 6 In Comparative Example 6, as shown in Table 5 below, the surface layer was formed with the following resin composition to a thickness of 50 ⁇ m, and the first base material layer was formed with the same composition as Example 1. In addition, it formed similarly to the comparative example 1.
  • Surface layer Polypropylene (PP) (same material as Comparative Example 1) 30% by mass + Metallocene PP (same material as Example 1) 25% by mass + Low density polyethylene (LDPE) (same material as in Example 1) 45% by mass
  • PP Polypropylene
  • LDPE Low density polyethylene
  • Comparative Example 7 In Comparative Example 7, as shown in Table 5 below, the surface layer was formed to a thickness of 50 ⁇ m with the following resin composition, and the first base material layer was formed with the same composition as Example 1. In addition, it formed similarly to the comparative example 1.
  • Surface layer Polypropylene (PP) (same material as Comparative Example 1) 60% by mass + Metallocene PP (same material as Example 1) 25% by mass + Low density polyethylene (LDPE) (same material as Example 1) 15% by mass
  • PP Polypropylene
  • LDPE Low density polyethylene
  • Heat-resistant As for heat resistance, adhesion to a heated heating plate assuming a hot plate contact heating method at the time of thermoforming a thermoformed container was evaluated. Evaluation is in the following three stages. A: When not attaching to a heating plate at 170 ° C. B: It does not adhere to the heating plate at 155 ° C, but adheres to the heating plate at 170 ° C. C: When attached to a heating plate at 155 ° C.
  • the adhesion (sealing) property is obtained by cutting the side part of the obtained package to a width of 15 mm to obtain a test sample, and from the inside to the outside of the flange part, a tensile tester (manufactured by Imada Co., Ltd. (trade name: Digital Force Gauge / Using a motorized stand)), measurement was performed 8 times at 180 ° peeling and 300 mm / min. Evaluation is in the following two stages. A: Tensile strength is 9.8 N (1.0 kgf) or more in all 8 times. B: The average of 8 times of tensile strength is 9.8 N (1.0 kgf) or more. C: The average of 8 times of tensile strength is less than 9.8 N (1.0 kgf).
  • peel strength The peel strength was cut to 15 mm width at the position of the opening start portion at the four corners of the obtained package to obtain a test sample, and the 135 ° peel, 300 mm / 300 mm from the outside of the flange portion to the inside using the above-described tensile tester. The measurement was performed 6 times per minute. Evaluation is in the following three stages.
  • B Tensile strength is 4.9 N (0.5 kgf) or more and less than 6.9 N (0.7 kgf) or tensile strength is 11.8 N (1.2 kgf) or more and less than 14.7 N (1.5 kgf)
  • C Tensile strength less than 4.9 N (0.5 kgf) or 14.7 N (1.5 kgf) or less
  • Comparative Example 6 in which there is a large amount of low density polyethylene, there was an inconvenience that the continuous molding was interrupted by adhering to the hot plate during thermoforming. Further, in Comparative Example 1 where the isotactic pentad fraction in the lower and lower layers was 92 mol%, the lid material could not be stably fused at the time of fusion, and the variation in adhesiveness and peel strength was large. On the other hand, in an example where the isotactic pentad fraction was 97 mol%, stable adhesiveness and peel strength were obtained. From Examples 1 and 8 to 10, it was not recognized that the evaluation differs greatly depending on the shape of the flange portion.
  • the present invention has both a high sealing property and an easy-opening property.
  • a multilayer sheet for producing this thermoformed container can be applied.

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  • Wrappers (AREA)
  • Laminated Bodies (AREA)
PCT/JP2011/061794 2010-05-28 2011-05-24 多層シート、熱成形容器、および、易開封性包装体 Ceased WO2011148912A1 (ja)

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