WO2020129842A1 - Packaging container - Google Patents

Packaging container Download PDF

Info

Publication number
WO2020129842A1
WO2020129842A1 PCT/JP2019/048928 JP2019048928W WO2020129842A1 WO 2020129842 A1 WO2020129842 A1 WO 2020129842A1 JP 2019048928 W JP2019048928 W JP 2019048928W WO 2020129842 A1 WO2020129842 A1 WO 2020129842A1
Authority
WO
WIPO (PCT)
Prior art keywords
thickness
lid
reverse taper
extending portion
foam
Prior art date
Application number
PCT/JP2019/048928
Other languages
French (fr)
Japanese (ja)
Inventor
込山和馬
Original Assignee
シーピー化成株式会社
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by シーピー化成株式会社 filed Critical シーピー化成株式会社
Priority to CN201980081566.2A priority Critical patent/CN113165785B/en
Publication of WO2020129842A1 publication Critical patent/WO2020129842A1/en

Links

Images

Classifications

    • 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—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, by deep-drawing operations performed on sheet material
    • B65D1/34—Trays or like shallow containers
    • 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
    • B65D43/00—Lids or covers for rigid or semi-rigid containers
    • B65D43/02—Removable lids or covers
    • B65D43/06—Removable lids or covers having a peripheral channel embracing the rim of the container
    • 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

Definitions

  • the present invention relates to a packaging container.
  • packaging containers are used to package food such as bento and side dishes.
  • a packaging container is often formed by thermoforming a thermoplastic resin sheet (sheet forming).
  • sheet forming An example of such a sheet-molded packaging container is disclosed in JP-A-2002-173160 (Patent Document 1).
  • Patent Document 1 it may be preferable to use a thermoplastic resin foam sheet as the thermoplastic resin sheet from the viewpoint of heat insulation and lightness.
  • the packaging container includes a foam container body made of a thermoplastic resin foam and a lid body fitted to the foam container body.
  • foaming container for packaging generally has a poor fitting force, so that the foaming container for packaging in a state in which an object to be contained such as food is stored.
  • the lid easily comes off from the foam container body during transportation or display.
  • the close contact with the foam container main body is improved and the lid is closed. It is possible to make it difficult for the body to come off, but in this case it becomes easier to open and close.
  • a packaging container comprising a foam container body made of a thermoplastic resin foam, and a lid fitted to the foam container body,
  • the foam container main body has a first extending portion that extends outward from the peripheral wall portion, a second extending portion that extends further outward from an outer edge of the first extending portion, and a peripheral side of the second extending portion.
  • a main body reverse taper portion which is provided and engages with the lid reverse taper portion of the lid body,
  • the thickness of the first boundary portion located at the boundary between the first extending portion and the second extending portion is smaller than the thickness of the first extending portion and the thickness of the second extending portion, or
  • the thickness of the second boundary portion located at the boundary between the second extending portion and the body reverse taper portion is smaller than the thickness of the second extending portion and the body reverse taper portion.
  • the main body reverse taper portion provided on the foam container main body and the lid reverse taper portion provided on the lid body are engaged with each other, whereby the fitting force between the foam container main body and the lid body can be increased. ..
  • the first boundary portion or the second boundary portion which is thinner than the portions on both sides thereof, serves as a fulcrum for elastic deformation of the foam container body when the lid is closed and when the lid is opened. Since the second boundary portion serves as a fulcrum, the main body reverse taper portion can be smoothly moved inward and the lid closing operation and the lid opening operation can be smoothly performed.
  • the body reverse taper portion can be smoothly moved inward through the second extending portion, and the lid closing operation and the lid opening operation can be smoothly performed.
  • the opening/closing operation of the lid can be easily performed. Therefore, it is possible to realize a foaming container for packaging which can be easily opened and closed and has excellent fitting force.
  • the thickness of the first boundary portion is smaller than the thickness of the first extending portion and the thickness of the second extending portion
  • the thickness of the second boundary portion is the thickness of the second extending portion and It is preferable that the thickness is smaller than the thickness of the reverse taper portion of the main body.
  • both the first boundary portion and the second boundary portion serve as fulcrums when the lid is closed and when the lid is opened, thereby expanding the entire movable range of the second extending portion and the body reverse taper portion.
  • the reverse taper part of the main body can be smoothly moved inward. Therefore, the opening/closing operation of the lid can be easily performed.
  • the density of the foam container body is preferably 0.03 g/cm 3 or more and 0.31 g/cm 3 or less.
  • the foam container body is formed by thermoforming a thermoplastic resin foam sheet, It is preferable that the bending elastic modulus of the thermoplastic resin foam sheet before thermoforming is 290 Mpa or more and 780 Mpa or less in the sheet flow direction and 140 Mpa or more and 800 Mpa or less in the sheet width direction.
  • the foam container body is formed by thermoforming a thermoplastic resin foam sheet,
  • the thickness of the thermoplastic resin foam sheet before thermoforming is preferably 1 mm or more and 3 mm or less.
  • the foam container body is formed by thermoforming a thermoplastic resin foam sheet,
  • the basis weight of the thermoplastic resin foam sheet before thermoforming is preferably 100 g/m 2 or more and 400 g/m 2 or less.
  • thermoforming a thermoplastic resin foam sheet having such characteristics, it elastically deforms when the lid is closed, and then returns and deforms after the lid is closed, and the body reverse taper and the lid are closed. Firmly engages the reverse taper of the body. Therefore, even with the foam container for packaging, the fitting force when the lid is opened can be improved.
  • a packaging container comprising a foam container body made of a thermoplastic resin foam, and a lid fitted to the foam container body,
  • the foam container main body has a flange portion extending outward from the peripheral wall portion, and a main body reverse taper portion which is provided on the peripheral side of the flange portion and engages with the lid reverse taper portion of the lid body,
  • the thickness of the boundary portion located at the boundary between the flange portion and the main body reverse taper portion is smaller than the thickness of the flange portion and the main body reverse taper portion.
  • the main body reverse taper portion provided on the foam container main body and the lid reverse taper portion provided on the lid body are engaged with each other, whereby the fitting force between the foam container main body and the lid body can be increased. ..
  • the boundary portions which are thinner on both sides of the flange portion and the main body reverse taper portion, serve as fulcrums for elastic deformation of the foam container main body when the lid is closed and when the lid is opened. That is, since the boundary portion serves as a fulcrum, the main body reverse taper portion can be smoothly moved inward, and the lid closing operation and the lid opening operation can be smoothly performed. Therefore, the opening/closing operation of the lid can be easily performed. Therefore, it is possible to realize a foaming container for packaging which can be easily opened and closed and has excellent fitting force.
  • a packaging container 1 for packaging food (an example of a contained object) such as a bowl or a side dish
  • the packaging container 1 is formed by molding a synthetic resin sheet.
  • the packaging container 1 is, for example, a dish-shaped container for containing food.
  • the packaging container 1 includes a foam container body 2 and a lid 4 that fits into the foam container body 2.
  • the foam container body 2 is made of a thermoplastic resin foam.
  • the lid 4 is made of a non-foamed thermoplastic resin.
  • the foam container body 2 includes a bottom surface portion 21, a body peripheral wall portion 22, a first extending portion 23, a second extending portion 24, a body reverse taper portion 27, It has a main body extending edge portion 28.
  • the bottom surface portion 21 forms the bottom portion of the foam container body 2.
  • the main body peripheral wall portion 22 extends upward from the peripheral edge of the bottom surface portion 21.
  • the main body peripheral wall portion 22 expands so as to widen outward as it goes upward.
  • the main body peripheral wall portion 22 corresponds to the “peripheral wall portion”.
  • the first extending portion 23 extends outward from the main body peripheral wall portion 22.
  • the first extending portion 23 has an inclination smaller than that of the main body peripheral wall portion 22 and widens outward so as to increase upward.
  • the second extending portion 24 extends further outward from the outer edge of the first extending portion 23. In the present embodiment, the second extending portion 24 expands so as to widen outward as it goes downward.
  • the body reverse taper portion 27 is provided on the peripheral side of the second extending portion 24.
  • the main body reverse taper portion 27 is formed so as to narrow inward as it goes downward.
  • the body reverse taper portion 27 engages with the lid reverse taper portion 47 of the lid body 4.
  • the main body extension edge portion 28 is formed so as to extend outward from the lower end portion of the main body reverse taper portion 27.
  • the foam container body 2 is formed by thermoforming a thermoplastic resin foam sheet.
  • the thermoplastic resin foam sheet has a thermoplastic resin foam layer mainly composed of a thermoplastic resin.
  • the thermoplastic resin forming the thermoplastic resin foam layer is not particularly limited.
  • general thermoplastic resins such as polyolefins (polyethylene, polypropylene, etc.), polyvinyl chloride, polystyrene, polyesters (polyethylene terephthalate, etc.), and acrylic resins can be appropriately used. These may each be a homopolymer, a copolymer with another monomer, a mixture with another resin, or a combination thereof.
  • polystyrene-based resin is a polystyrene-based resin
  • the other resin that constitutes the other monomer or the mixture that constitutes the copolymer for example, an acrylic resin, a polyolefin-based resin, a urethane-based resin, and a modified polyphenylene ether. Resin etc. are illustrated.
  • thermoplastic resin foamed sheet may include a thermoplastic resin non-foamed layer mainly composed of a thermoplastic resin on at least one surface of the thermoplastic resin layer.
  • the thermoplastic resin forming the non-foamed thermoplastic resin layer is not particularly limited.
  • general thermoplastic resins such as polyolefins (polyethylene, polypropylene, etc.), polyvinyl chloride, polystyrene, polyesters (polyethylene terephthalate, etc.), and acrylic resins can be appropriately used. These may each be a homopolymer, a copolymer with another monomer, a mixture with another resin, or a combination thereof.
  • polystyrene-based resins and polyolefin-based resins.
  • each method such as a coextrusion method, an extrusion laminating method, and a thermal laminating method can be adopted.
  • the thickness of the thermoplastic resin foam sheet before thermoforming is not particularly limited, but is preferably 1 mm or more and 3 mm or less. If the thickness of the thermoplastic resin foam sheet is less than 1 mm, the rigidity and heat insulating property may be insufficient, and if it is more than 3 mm, the moldability may be insufficient.
  • the preferable thickness of the thermoplastic resin foam sheet is, for example, 1.5 mm or more and 2.5 mm or less.
  • the basis weight of the thermoplastic resin foam sheet (particularly, the thermoplastic resin foam layer) before thermoforming is not particularly limited, but is preferably 100 g/m 2 or more and 400 g/m 2 or less. If the basis weight is less than 100 g/m 2 , it becomes difficult to form the deep dish-shaped foam container body 2 by sheet molding, and if the basis weight exceeds 400 g/m 2, the thermoplastic resin foam sheet is formed by extrusion foam molding. Difficult to form.
  • the preferable basis weight of the thermoplastic resin foam sheet is, for example, 110 g/m 2 or more and 300 g/m 2 or less.
  • the basis weight of the thermoplastic resin foam sheet is three points at equal intervals in the direction orthogonal to the flow direction of the thermoplastic resin foam sheet (sheet width direction), 10 cm ⁇ 10 cm sheet pieces are cut out, and the mass of each sheet piece is cut. Is calculated and calculated as the average mass.
  • the basis weight of the thermoplastic resin foam sheet can be adjusted by adjusting the supply amount of the raw material resin or the extrusion amount of the molten resin. Alternatively, it can be adjusted by adjusting the temperature condition or pressure condition during extrusion molding.
  • the bending elastic modulus of the thermoplastic resin foam sheet (particularly, the thermoplastic resin foam layer) before thermoforming is not particularly limited, but it is preferably 140 MPa or more and 800 MPa or less.
  • the bending elastic modulus of the thermoplastic resin foam sheet may be different between the flow direction of the thermoplastic resin foam sheet (sheet flow direction) and the direction orthogonal to it (sheet width direction). In this case, it is preferable that the sheet flow direction is 290 Mpa or more and 780 Mpa or less and the sheet width direction is 140 Mpa or more and 800 Mpa or less.
  • the bending elastic modulus of a preferable thermoplastic resin foam sheet is, for example, 440 Mpa or more and 630 Mpa or less in the sheet flow direction and 340 Mpa or more and 600 Mpa or less in the sheet width direction.
  • the bending elastic modulus of the thermoplastic resin foam sheet is measured according to the following method, which is partially modified in accordance with JIS K7074 which should be originally applied to carbon fiber reinforced plastics.
  • a test piece of 100 mm in length and 25 mm in width is cut out from the thermoplastic resin foam sheet in each of the sheet flow direction and the sheet width direction.
  • the distance L between the fulcrums is 60 mm
  • the radius R1 of the indenter is 10 mm
  • the radius R2 of the support is 10 mm
  • the test speed V is 10 mm/min.
  • the lid 4 is formed in the foam container body 2 obtained by thermoforming the thermoplastic resin foam sheet. After elastic deformation due to opening and closing, it is easy to restore the shape firmly.
  • the foam container body 2 can be formed by sheet molding (thermoforming) using the thermoplastic resin foam sheet described above.
  • thermoforming method include a plug forming method, a matched mold forming method, a straight forming method, a drape forming method, a plug assist forming method, a plug assist reverse draw forming method, an air slip forming method, a snapback forming method, and a reverse draw.
  • a molding method, a plug-and-ridge molding method, a ridge molding method and the like are exemplified.
  • the density of the foam container body 2 obtained by thermoforming the thermoplastic resin foam sheet of the present embodiment is not particularly limited, but is preferably 0.03 g/cm 3 or more and 0.31 g/cm 3 or less. If the density of the foam container body 2 is less than 0.03 g/cm 3 , the strength and rigidity at high temperature may be insufficient, and if it exceeds 0.31 g/cm 3 , the heat insulating property may be insufficient. is there.
  • the preferable density of the foam container body 2 is, for example, 0.06 g/cm 3 or more and 0.22 g/cm 3 or less.
  • the density of the foam container body 2 is measured by cutting out a 3 cm ⁇ 3 cm test piece from the bottom surface 21 and using an electronic hydrometer (Mirage Trading Co., Ltd., model: ED-120T) by the underwater substitution method.
  • the lid 4 fits into the foam container body 2 and covers the upper opening of the foam container body 2.
  • the lid 4 includes a top surface portion 41, a lid peripheral wall portion 42, a flange portion 43, an inclined surface portion 44, a hanging lower surface portion 45, and an inward projection 46 (lid body reverse portion). It has a taper portion 47) and a lid extending edge portion 48.
  • the top surface portion 41 forms a ceiling portion of the lid body 4.
  • the lid peripheral wall portion 42 extends downward from the peripheral edge of the top surface portion 41. The lid peripheral wall portion 42 expands so as to widen outward as it goes downward.
  • the flange portion 43 extends outward from the lid peripheral wall portion 42. In the present embodiment, the flange portion 43 extends along the horizontal plane.
  • the inclined surface portion 44 extends further outward from the outer edge of the flange portion 43. In the present embodiment, the inclined surface portion 44 expands so as to widen outward as it goes downward.
  • the hanging lower surface portion 45 is formed so as to hang downward from the outer edge of the inclined surface portion 44.
  • An inward projection 46 protruding inward is formed on the hanging bottom surface portion 45, and a portion of the inward projection 46 that narrows inward as it goes downward serves as a lid reverse taper portion 47. There is.
  • the lid reverse taper portion 47 engages with the body reverse taper portion 27 of the foam container body 2.
  • the lid extending edge portion 48 is formed so as to extend outward from the lower end portion of the inward protrusion 46.
  • the boundary portion between the first extending portion 23 and the second extending portion 24 of the foam container body 2 (see The flange portion 43 of the lid 4 is placed on the one boundary portion 31). Further, the inclined surface portion 44 of the lid 4 is placed on the second extending portion 24 of the foam container body 2. Further, the hanging bottom surface portion 45 of the lid 4 comes into contact with the boundary portion (the second boundary portion 32 described later) between the second extending portion 24 of the foam container body 2 and the body reverse taper portion 27 from the outside. Further, the lid reverse taper portion 47 of the lid body 4 engages with the body reverse taper portion 27 of the foam container body 2 from the outside.
  • the “reverse taper engaging portion” is formed by the body reverse taper portion 27 and the lid reverse taper portion 47 which are engaged with each other. Further, the lid extending edge 48 of the lid 4 is placed on the body extending edge 28 of the foam container body 2. At this time, the outer edge of the lid extending edge portion 48 is located inside the outer edge of the main body extending edge portion 28.
  • the thickness T1 of the first boundary portion 31 located at the boundary between the first extending portion 23 and the second extending portion 24 of the foam container body 2 is It is smaller than the thickness T3 of the first extending portion 23 and the thickness T4 of the second extending portion 24.
  • a first collective portion 33 that is recessed in a concave shape is formed on the inner surface side of the first boundary portion 31 in the foam container body 2.
  • the thickness T1 of the first boundary portion 31 is smaller than the thickness T3 of the first extending portion 23 and the thickness T4 of the second extending portion 24 due to the existence of the first bundled portion 33.
  • the thickness T1 of the first boundary portion 31 may be, for example, about 0.5 to 0.9 times the thickness T3 of the first extending portion 23, and 0 of the thickness T4 of the second extending portion 24. It may be about 3 to 0.9 times.
  • the thickness T2 of the second boundary portion 32 located at the boundary between the second extending portion 24 and the body reverse taper portion 27 is equal to the thickness T4 of the second extending portion 24 and the body reverse taper portion 27. It is smaller than the thickness T5.
  • a second constricted portion 34 that is recessed in a concave shape is formed on the inner surface side of the second boundary portion 32 in the foam container body 2. Due to the existence of the second constricted portion 34, the thickness T2 of the second boundary portion 32 is smaller than the thickness T4 of the second extending portion 24 and the thickness T5 of the main body reverse taper portion 27.
  • the thickness T2 of the second boundary portion 32 may be, for example, about 0.3 to 0.9 times the thickness T4 of the second extending portion 24, and the thickness T5 of the main body reverse taper portion 27 may be 0. It may be about 5 to 0.9 times.
  • the thickness T1 of the first boundary portion 31 and the thickness T2 of the second boundary portion 32 are substantially the same.
  • the thickness T3 of the first extending portion 23 and the thickness T5 of the main body reverse taper portion 27 are about the same, and the thickness T4 of the second extending portion 24 is larger than these. That is, in the present embodiment, the thickness T3 of the first extending portion 23 and the thickness T5 of the main body inverse taper portion 27 are smaller than the thickness T4 of the second extending portion 24, and the thickness T3 of the first extending portion 23.
  • the thickness T1 of the first boundary portion 31 and the thickness T2 of the second boundary portion 32 are smaller than the thickness T5 of the main body reverse taper portion 27.
  • both the main body reverse taper portion 27 and the lid reverse taper portion 47 are formed so as to narrow inward as they go downward. Therefore, the “reverse taper engaging portion” formed by engaging the main body reverse taper portion 27 and the lid reverse taper portion 47 is also formed so as to face inward as it goes downward.
  • the inclination ⁇ of the reverse taper engaging portion with respect to the vertical line is preferably 15° to 75°, for example.
  • the engagement depth D (depth of the recess formed on the outer surface side of the inward projection 46) by the reverse taper engagement portion is preferably 0.5 mm to 40 mm, for example.
  • the first boundary portions 31 having a relatively small thickness with respect to the first extending portion 23 and the second extending portion 24 on both sides of the lid are provided in the foam container body 2.
  • the second boundary portions 32 which have a relatively small thickness with respect to the second extending portion 24 and the main body reverse taper portion 27 on both sides thereof, also serve as another fulcrum of elastic deformation of the foam container main body 2 and become the main body.
  • the reverse taper portion 27 can be smoothly moved inward.
  • both the first boundary portion 31 and the second boundary portion 32 serve as fulcrums, and the main body reverse taper portion 27 is expanded while widening the entire movable range of the second extending portion 24 and the body reverse taper portion 27. It can be moved smoothly inward. Therefore, the lid closing operation can be easily performed.
  • the foam container body 2 restores its shape, and the body reverse taper portion 27 and the lid reverse taper portion 47 are firmly engaged. Therefore, the fitting force of the reverse taper engaging portion formed by the main body reverse taper portion 27 and the lid reverse taper portion 47 engaging with each other can be increased. Therefore, for example, the lid body 4 is unlikely to come off from the foam container body 2 when the packaging container 1 is transported or displayed in a state of containing an object such as food.
  • both the first boundary portion 31 and the second boundary portion 32 serve as fulcrums to expand the entire movable range of the second extending portion 24 and the main body reverse taper portion 27.
  • the main body reverse taper portion 27 can be smoothly moved inward. Therefore, the lid opening operation can be easily performed.
  • the packaging container 1 of the present embodiment it is possible to easily perform the opening/closing operation of the lid body 4 and increase the fitting force between the foam container body 2 and the lid body 4 in the closed state. it can. Therefore, it is possible to facilitate the work for accommodating an object to be contained such as food in the packaging container 1, and remove the lid 4 from the foam container body 2 in the packaging container 1 accommodating the object to be accommodated. It can be difficult.
  • the thickness T1 of the first boundary portion 31 is smaller than the thickness T3 of the first extending portion 23 and the thickness T4 of the second extending portion 24, and the thickness of the second boundary portion 32.
  • the configuration in which T2 is smaller than the thickness T4 of the second extending portion 24 and the thickness T5 of the main body reverse taper portion 27 has been described as an example.
  • the thickness T1 of the first boundary portion 31 is smaller than the thickness T3 of the first extending portion 23 and the thickness T4 of the second extending portion 24, and
  • the thickness T2 of the boundary portion 32 may be at least one of the thickness T4 of the second extending portion 24 and the thickness T5 of the main body reverse taper portion 27.
  • the packaging container 1 in this case is A packaging container 1 comprising: a foam container body 2 made of a thermoplastic resin foam; and a lid 4 fitted to the foam container body 2.
  • the foam container body 2 includes a first extending portion 23 extending outward from the main body peripheral wall portion 22, a second extending portion 24 extending further outward from an outer edge of the first extending portion 23, and the second extending portion.
  • a main body reverse taper portion 27 which is provided on the peripheral side of the portion 24 and engages with the lid reverse taper portion 47 of the lid body 4,
  • the thickness T1 of the first boundary portion 31 located at the boundary between the first extending portion 23 and the second extending portion 24 is equal to the thickness T3 of the first extending portion 23 and the thickness of the second extending portion 24. Smaller than thickness T4, It has a configuration.
  • the thickness T2 of the second boundary portion 32 is only smaller than the thickness T4 of the second extending portion 24 and the thickness T5 of the body reverse taper portion 27, and the thickness T1 of the first boundary portion 31 is the first extending portion. It may be at least one of the thickness T3 of the portion 23 and the thickness T4 of the second extending portion 24.
  • the packaging container 1 in this case is A packaging container 1 comprising: a foam container body 2 made of a thermoplastic resin foam; and a lid 4 fitted to the foam container body 2.
  • the foam container body 2 includes a first extending portion 23 extending outward from the main body peripheral wall portion 22, a second extending portion 24 extending further outward from an outer edge of the first extending portion 23, and the second extending portion.
  • a main body reverse taper portion 27 which is provided on the peripheral side of the portion 24 and engages with the lid reverse taper portion 47 of the lid body 4,
  • the thickness T2 of the second boundary portion 32 located at the boundary between the second extending portion 24 and the body reverse taper portion 27 is smaller than the thickness T4 of the second extending portion 24 and the thickness T5 of the body reverse taper portion 27. , It has a configuration.
  • the foam container body 2 has the first extending portion 23 that expands outward as it goes upward, and the second extending portion 24 that expands outward as it goes downward.
  • the configuration has been described as an example.
  • the foam container main body 2 may have a “main body flange portion” extending along a horizontal plane.
  • Such a main body flange portion may be constituted by the first extending portion 23 as shown in FIG. 5, or may be constituted by the second extending portion 24 as shown in FIG.
  • the first extending portion 23 may be configured as a portion that is clearly distinguished from the main body peripheral wall portion 22, or may be configured by an upper region of the main body peripheral wall portion 22.
  • the foam container body 2 is provided with the first extending portion 23, the second extending portion 24, and the body reverse taper portion 27, and the thickness T1 of the first boundary portion 31. Is smaller than the thickness T3 of the first extending portion 23 and the thickness T4 of the second extending portion 24, or the thickness T2 of the second boundary portion 32 is the thickness T4 of the second extending portion 24 and the body reverse taper portion.
  • the structure having the thickness smaller than the thickness T5 of 27 has been described as an example. However, without being limited to such a configuration, as shown in FIG. 7, for example, as a substitute configuration in which the foam container body 2 corresponds to the first extending portion 23 and the second extending portion 24, a flange portion (body flange Part) 25 may be provided.
  • the flange portion 25 may be provided so as to extend along the horizontal plane, or may be provided so as to extend while being inclined with respect to the horizontal plane. Then, on the premise of such a configuration, the thickness T6 of the boundary portion 36 located at the boundary between the flange portion 25 and the body reverse taper portion 27 is smaller than the thickness T7 of the flange portion 25 and the thickness T5 of the body reverse taper portion 27. It is good to be done.
  • thermoplastic resin foam sheet that constitutes the foam container body 2 a structure in which the thickness, the basis weight, and the flexural modulus before thermoforming are within specific numerical ranges is used. Described as an example. However, without being limited to such a configuration, the physical properties (the above-mentioned characteristic values) of the thermoplastic resin foam sheet before thermoforming may be arbitrary.
  • the reverse taper engaging portion formed by engaging the main body reverse taper portion 27 and the lid reverse taper portion 47 may be provided over the entire circumference or may be provided intermittently (intermittently). May be. In the latter case, the body reverse taper portion 27 may be provided over the entire circumference and the lid reverse taper portion 47 may be provided intermittently (intermittently), or the body reverse taper portion 27 and the lid reverse taper portion. Both 47 may be provided intermittently (intermittently) at positions corresponding to each other.
  • the overall shape of the packaging container 1 may be arbitrary.
  • Various shapes can be adopted.

Abstract

A packaging container is provided with a foaming container body (2) and a lid body. The foaming container body (2) has a first extension part (23) that extends outward from a peripheral wall part (22), a second extension part (24) that extends outward from the first extension part (23), and a body reversely tapered part (27) that is provided on the side closer to a periphery than the second extension part (24) and engages a lid-body reversely tapered part of the lid body. A thickness (T1) of a first boundary part (31) is smaller than a thickness (T3) of the first extension part (23) and a thickness (T4) of the second extension part (24), or a thickness (T2) of a second boundary part (32) is smaller than the thickness (T4) of the second extension part (24) and a thickness (T5) of the body reversely tapered part (27).

Description

包装用容器Packaging container
　本発明は、包装用容器に関する。 The present invention relates to a packaging container.
　例えば弁当や惣菜等の食品を包装するために、包装用容器が用いられている。このような包装用容器は、多くの場合、熱可塑性樹脂シートの熱成形（シート成形）によって形成される。このようなシート成形の包装用容器の一例が、特開２００２－１７３１６０号公報（特許文献１）に開示されている。特許文献１に記載されているように、断熱性及び軽量性の観点からは、熱可塑性樹脂シートとして熱可塑性樹脂発泡シートを用いることが好ましい場合がある。この場合、包装用容器は、熱可塑性樹脂発泡体からなる発泡容器本体と、その発泡容器本体に嵌合する蓋体とを備えることになる。 For example, packaging containers are used to package food such as bento and side dishes. Such a packaging container is often formed by thermoforming a thermoplastic resin sheet (sheet forming). An example of such a sheet-molded packaging container is disclosed in JP-A-2002-173160 (Patent Document 1). As described in Patent Document 1, it may be preferable to use a thermoplastic resin foam sheet as the thermoplastic resin sheet from the viewpoint of heat insulation and lightness. In this case, the packaging container includes a foam container body made of a thermoplastic resin foam and a lid body fitted to the foam container body.
　しかし、そのような包装用容器（以下、「包装用発泡容器」と言う場合がある。）は、一般に嵌合力に劣るため、食品等の被収容物を収容した状態での包装用発泡容器の搬送時や陳列時等に、発泡容器本体から蓋体が外れやすいという問題があった。一方、発泡容器本体のフランジ部の外方に形成される垂れ部の下端に、蓋体に形成された内向きの屈曲部を係合させることで、発泡容器本体との密着性を高めて蓋体を外れにくくすることもできるが、この場合には開閉操作に手間取りやすくなる。 However, such a packaging container (hereinafter, also referred to as “foaming container for packaging”) generally has a poor fitting force, so that the foaming container for packaging in a state in which an object to be contained such as food is stored. There is a problem that the lid easily comes off from the foam container body during transportation or display. On the other hand, by engaging the inward bent portion formed on the lid with the lower end of the hanging portion formed outside the flange portion of the foam container main body, the close contact with the foam container main body is improved and the lid is closed. It is possible to make it difficult for the body to come off, but in this case it becomes easier to open and close.
特開２００２－１７３１６０号公報Japanese Patent Laid-Open No. 2002-173160
　蓋体の開閉操作を容易に行うことができるとともに嵌合力にも優れる包装用発泡容器の実現が望まれる。  It is desired to realize a foaming container for packaging that can be easily opened and closed and has excellent fitting force.
　本発明に係る包装用容器は、
　熱可塑性樹脂発泡体からなる発泡容器本体と、前記発泡容器本体に嵌合する蓋体と、を備える包装用容器であって、
　前記発泡容器本体は、周壁部から外側に延びる第一延在部と、前記第一延在部の外縁からさらに外側に延びる第二延在部と、前記第二延在部よりも周縁側に設けられて前記蓋体の蓋体逆テーパー部に係合する本体逆テーパー部と、を有し、
　前記第一延在部と前記第二延在部との境界に位置する第一境界部の厚みが、前記第一延在部の厚み及び前記第二延在部の厚みよりも小さいか、又は、前記第二延在部と前記本体逆テーパー部との境界に位置する第二境界部の厚みが、前記第二延在部の厚み及び前記本体逆テーパー部の厚みよりも小さい。 The packaging container according to the present invention,
A packaging container comprising a foam container body made of a thermoplastic resin foam, and a lid fitted to the foam container body,
The foam container main body has a first extending portion that extends outward from the peripheral wall portion, a second extending portion that extends further outward from an outer edge of the first extending portion, and a peripheral side of the second extending portion. And a main body reverse taper portion which is provided and engages with the lid reverse taper portion of the lid body,
The thickness of the first boundary portion located at the boundary between the first extending portion and the second extending portion is smaller than the thickness of the first extending portion and the thickness of the second extending portion, or The thickness of the second boundary portion located at the boundary between the second extending portion and the body reverse taper portion is smaller than the thickness of the second extending portion and the body reverse taper portion.
　この構成によれば、発泡容器本体に設けられる本体逆テーパー部と蓋体に設けられる蓋体逆テーパー部とが係合することで、発泡容器本体と蓋体との嵌合力を高めることができる。また、それぞれその両側の部位よりも厚みが薄い第一境界部又は第二境界部が、閉蓋時及び開蓋時に、発泡容器本体の弾性変形の支点となる。第二境界部が支点となることで、本体逆テーパー部を内方側にスムーズに移動させ、閉蓋操作及び開蓋操作を円滑に行うことができる。或いは、第一境界部が支点となることで、第二延在部を介して本体逆テーパー部を内方側にスムーズに移動させ、閉蓋操作及び開蓋操作を円滑に行うことができる。いずれにしても、蓋体の開閉操作を容易に行うことができる。従って、蓋体の開閉操作を容易に行うことができるとともに嵌合力にも優れる包装用発泡容器を実現することができる。 According to this configuration, the main body reverse taper portion provided on the foam container main body and the lid reverse taper portion provided on the lid body are engaged with each other, whereby the fitting force between the foam container main body and the lid body can be increased. .. Further, the first boundary portion or the second boundary portion, which is thinner than the portions on both sides thereof, serves as a fulcrum for elastic deformation of the foam container body when the lid is closed and when the lid is opened. Since the second boundary portion serves as a fulcrum, the main body reverse taper portion can be smoothly moved inward and the lid closing operation and the lid opening operation can be smoothly performed. Alternatively, since the first boundary portion serves as a fulcrum, the body reverse taper portion can be smoothly moved inward through the second extending portion, and the lid closing operation and the lid opening operation can be smoothly performed. In any case, the opening/closing operation of the lid can be easily performed. Therefore, it is possible to realize a foaming container for packaging which can be easily opened and closed and has excellent fitting force.
　以下、本発明の好適な態様について説明する。但し、以下に記載する好適な態様例によって、本発明の範囲が限定される訳ではない。 Hereinafter, preferred embodiments of the present invention will be described. However, the scope of the present invention is not limited by the preferred embodiments described below.
　一態様として、
　前記第一境界部の厚みが、前記第一延在部の厚み及び前記第二延在部の厚みよりも小さく、かつ、前記第二境界部の厚みが、前記第二延在部の厚み及び前記本体逆テーパー部の厚みよりも小さいことが好ましい。 As one aspect,
The thickness of the first boundary portion is smaller than the thickness of the first extending portion and the thickness of the second extending portion, and the thickness of the second boundary portion is the thickness of the second extending portion and It is preferable that the thickness is smaller than the thickness of the reverse taper portion of the main body.
　この構成によれば、閉蓋時及び開蓋時に、第一境界部及び第二境界部の両方が支点となることで、第二延在部及び本体逆テーパー部の全体の可動範囲を広げつつ、本体逆テーパー部を内方側にスムーズに移動させることができる。よって、蓋体の開閉操作を容易に行うことができる。 According to this structure, both the first boundary portion and the second boundary portion serve as fulcrums when the lid is closed and when the lid is opened, thereby expanding the entire movable range of the second extending portion and the body reverse taper portion. , The reverse taper part of the main body can be smoothly moved inward. Therefore, the opening/closing operation of the lid can be easily performed.
　一態様として、
　前記発泡容器本体の密度が、０．０３ｇ／ｃｍ３以上０．３１ｇ／ｃｍ３以下であることが好ましい。 As one aspect,
The density of the foam container body is preferably 0.03 g/cm 3 or more and 0.31 g/cm 3 or less.
　この構成によれば、発泡容器本体の軽量化を図ることができるとともに、断熱性及び保温性を確保することができる。また、これらの特性を発揮させながら、蓋体の開閉操作の容易化を図るとともに嵌合力を向上させることができる。 According to this configuration, it is possible to reduce the weight of the foam container main body and to secure heat insulation and heat retention. Further, while exhibiting these characteristics, the opening/closing operation of the lid can be facilitated and the fitting force can be improved.
　一態様として、
　前記発泡容器本体は、熱可塑性樹脂発泡シートの熱成形によって形成されるものであり、
　熱成形前における前記熱可塑性樹脂発泡シートの曲げ弾性率が、シート流れ方向で２９０Ｍｐａ以上７８０Ｍｐａ以下であり、かつ、シート幅方向で１４０Ｍｐａ以上８００Ｍｐａ以下であることが好ましい。 As one aspect,
The foam container body is formed by thermoforming a thermoplastic resin foam sheet,
It is preferable that the bending elastic modulus of the thermoplastic resin foam sheet before thermoforming is 290 Mpa or more and 780 Mpa or less in the sheet flow direction and 140 Mpa or more and 800 Mpa or less in the sheet width direction.
　一態様として、
　前記発泡容器本体は、熱可塑性樹脂発泡シートの熱成形によって形成されるものであり、
　熱成形前における前記熱可塑性樹脂発泡シートの厚みが、１ｍｍ以上３ｍｍ以下であることが好ましい。 As one aspect,
The foam container body is formed by thermoforming a thermoplastic resin foam sheet,
The thickness of the thermoplastic resin foam sheet before thermoforming is preferably 1 mm or more and 3 mm or less.
　一態様として、
　前記発泡容器本体は、熱可塑性樹脂発泡シートの熱成形によって形成されるものであり、
　熱成形前における前記熱可塑性樹脂発泡シートの坪量が、１００ｇ／ｍ２以上４００ｇ／ｍ２以下であることが好ましい。 As one aspect,
The foam container body is formed by thermoforming a thermoplastic resin foam sheet,
The basis weight of the thermoplastic resin foam sheet before thermoforming is preferably 100 g/m 2 or more and 400 g/m 2 or less.
　これらのような特性の熱可塑性樹脂発泡シートの熱成形によって形成される発泡容器本体であれば、閉蓋操作時に弾性変形し、その後、閉蓋完了後に復帰変形して、本体逆テーパー部と蓋体逆テーパー部とがしっかりと係合する。よって、包装用発泡容器であっても、開蓋時の嵌合力を向上させることができる。 If it is a foam container body formed by thermoforming a thermoplastic resin foam sheet having such characteristics, it elastically deforms when the lid is closed, and then returns and deforms after the lid is closed, and the body reverse taper and the lid are closed. Firmly engages the reverse taper of the body. Therefore, even with the foam container for packaging, the fitting force when the lid is opened can be improved.
　本発明に係るもう１つの包装用容器は、
　熱可塑性樹脂発泡体からなる発泡容器本体と、前記発泡容器本体に嵌合する蓋体と、を備える包装用容器であって、
　前記発泡容器本体は、周壁部から外側に延びるフランジ部と、前記フランジ部よりも周縁側に設けられて前記蓋体の蓋体逆テーパー部に係合する本体逆テーパー部と、を有し、
　前記フランジ部と前記本体逆テーパー部との境界に位置する境界部の厚みが、前記フランジ部の厚み及び前記本体逆テーパー部の厚みよりも小さい。 Another packaging container according to the present invention is
A packaging container comprising a foam container body made of a thermoplastic resin foam, and a lid fitted to the foam container body,
The foam container main body has a flange portion extending outward from the peripheral wall portion, and a main body reverse taper portion which is provided on the peripheral side of the flange portion and engages with the lid reverse taper portion of the lid body,
The thickness of the boundary portion located at the boundary between the flange portion and the main body reverse taper portion is smaller than the thickness of the flange portion and the main body reverse taper portion.
　この構成によれば、発泡容器本体に設けられる本体逆テーパー部と蓋体に設けられる蓋体逆テーパー部とが係合することで、発泡容器本体と蓋体との嵌合力を高めることができる。また、その両側の部位であるフランジ部及び本体逆テーパー部よりも厚みが薄い境界部が、閉蓋時及び開蓋時に、発泡容器本体の弾性変形の支点となる。すなわち、境界部が支点となることで、本体逆テーパー部を内方側にスムーズに移動させ、閉蓋操作及び開蓋操作を円滑に行うことができる。よって、蓋体の開閉操作を容易に行うことができる。従って、蓋体の開閉操作を容易に行うことができるとともに嵌合力にも優れる包装用発泡容器を実現することができる。 According to this configuration, the main body reverse taper portion provided on the foam container main body and the lid reverse taper portion provided on the lid body are engaged with each other, whereby the fitting force between the foam container main body and the lid body can be increased. .. Further, the boundary portions, which are thinner on both sides of the flange portion and the main body reverse taper portion, serve as fulcrums for elastic deformation of the foam container main body when the lid is closed and when the lid is opened. That is, since the boundary portion serves as a fulcrum, the main body reverse taper portion can be smoothly moved inward, and the lid closing operation and the lid opening operation can be smoothly performed. Therefore, the opening/closing operation of the lid can be easily performed. Therefore, it is possible to realize a foaming container for packaging which can be easily opened and closed and has excellent fitting force.
　本発明のさらなる特徴と利点は、図面を参照して記述する以下の例示的かつ非限定的な実施形態の説明によってより明確になるであろう。 Further features and advantages of the present invention will become more apparent by the following description of exemplary and non-limiting embodiments described with reference to the drawings.
包装用容器の断面図Cross section of packaging container 包装用容器の拡大断面図Enlarged cross-sectional view of packaging container 発泡容器本体の拡大断面図Expanded sectional view of the foam container body 閉蓋時の発泡容器本体の変形の様子を示す模式図Schematic diagram showing how the foam container body deforms when the lid is closed 別態様の発泡容器本体の拡大断面図Enlarged sectional view of a foam container body of another embodiment 別態様の発泡容器本体の拡大断面図Enlarged sectional view of a foam container body of another embodiment 別態様の発泡容器本体の拡大断面図Enlarged sectional view of a foam container body of another embodiment
　包装用容器の実施形態について、図面を参照して説明する。本実施形態では、例えば丼や惣菜等の食品（被収容物の一例）を包装するための包装用容器１（食品包装用容器）を例として説明する。この包装用容器１は、合成樹脂シートのシート成形によって形成される。 An embodiment of a packaging container will be described with reference to the drawings. In the present embodiment, for example, a packaging container 1 (food packaging container) for packaging food (an example of a contained object) such as a bowl or a side dish will be described. The packaging container 1 is formed by molding a synthetic resin sheet.
　図１に示すように、包装用容器１は、例えば食品を収容する深皿状の器である。包装用容器１は、発泡容器本体２と、その発泡容器本体２に嵌合する蓋体４とを備えている。発泡容器本体２は、熱可塑性樹脂発泡体で構成されている。蓋体４は、熱可塑性樹脂非発泡体で構成されている。 As shown in FIG. 1, the packaging container 1 is, for example, a dish-shaped container for containing food. The packaging container 1 includes a foam container body 2 and a lid 4 that fits into the foam container body 2. The foam container body 2 is made of a thermoplastic resin foam. The lid 4 is made of a non-foamed thermoplastic resin.
　図１及び図２に示すように、発泡容器本体２は、底面部２１と、本体周壁部２２と、第一延在部２３と、第二延在部２４と、本体逆テーパー部２７と、本体延出縁部２８とを有している。底面部２１は、発泡容器本体２の底部を形成している。本体周壁部２２は、底面部２１の周縁から上方に延びている。本体周壁部２２は、上方に向かうに従って外側に向かって広がるように拡開している。本実施形態では、本体周壁部２２が「周壁部」に相当する。 As shown in FIG. 1 and FIG. 2, the foam container body 2 includes a bottom surface portion 21, a body peripheral wall portion 22, a first extending portion 23, a second extending portion 24, a body reverse taper portion 27, It has a main body extending edge portion 28. The bottom surface portion 21 forms the bottom portion of the foam container body 2. The main body peripheral wall portion 22 extends upward from the peripheral edge of the bottom surface portion 21. The main body peripheral wall portion 22 expands so as to widen outward as it goes upward. In the present embodiment, the main body peripheral wall portion 22 corresponds to the “peripheral wall portion”.
　第一延在部２３は、本体周壁部２２から外側に延びている。本実施形態では、第一延在部２３は、本体周壁部２２よりも小さな傾きで、上方に向かうに従って外側に向かって広がるように拡開している。第二延在部２４は、第一延在部２３の外縁からさらに外側に延びている。本実施形態では、第二延在部２４は、下方に向かうに従って外側に向かって広がるように拡開している。本体逆テーパー部２７は、第二延在部２４よりも周縁側に設けられている。本体逆テーパー部２７は、下方に向かうに従って内側に向かって窄まるように形成されている。この本体逆テーパー部２７は、蓋体４の蓋体逆テーパー部４７に係合する。本体延出縁部２８は、本体逆テーパー部２７の下端部から、外側に延出するように形成されている。 The first extending portion 23 extends outward from the main body peripheral wall portion 22. In the present embodiment, the first extending portion 23 has an inclination smaller than that of the main body peripheral wall portion 22 and widens outward so as to increase upward. The second extending portion 24 extends further outward from the outer edge of the first extending portion 23. In the present embodiment, the second extending portion 24 expands so as to widen outward as it goes downward. The body reverse taper portion 27 is provided on the peripheral side of the second extending portion 24. The main body reverse taper portion 27 is formed so as to narrow inward as it goes downward. The body reverse taper portion 27 engages with the lid reverse taper portion 47 of the lid body 4. The main body extension edge portion 28 is formed so as to extend outward from the lower end portion of the main body reverse taper portion 27.
　発泡容器本体２は、熱可塑性樹脂発泡シートの熱成形によって形成される。熱可塑性樹脂発泡シートは、熱可塑性樹脂を主体とする熱可塑性樹脂発泡層を備えている。熱可塑性樹脂発泡層を構成する熱可塑性樹脂は、特に限定されない。例えばポリオレフィン（ポリエチレンやポリプロピレン等）、ポリ塩化ビニル、ポリスチレン、ポリエステル（ポリエチレンテレフタレート等）、及びアクリル樹脂等の一般的な熱可塑性樹脂を適宜使用することができる。これらは、それぞれ、単独重合体、他の単量体との共重合体、他の樹脂との混合物、又はそれらの組み合わせであって良い。好ましくは、ポリスチレン系樹脂であり、この場合、共重合体を構成する他の単量体や混合物を構成する他の樹脂としては、例えばアクリル樹脂、ポリオレフィン系樹脂、ウレタン系樹脂、及び変性ポリフェニレンエーテル樹脂等が例示される。 The foam container body 2 is formed by thermoforming a thermoplastic resin foam sheet. The thermoplastic resin foam sheet has a thermoplastic resin foam layer mainly composed of a thermoplastic resin. The thermoplastic resin forming the thermoplastic resin foam layer is not particularly limited. For example, general thermoplastic resins such as polyolefins (polyethylene, polypropylene, etc.), polyvinyl chloride, polystyrene, polyesters (polyethylene terephthalate, etc.), and acrylic resins can be appropriately used. These may each be a homopolymer, a copolymer with another monomer, a mixture with another resin, or a combination thereof. Preferably, it is a polystyrene-based resin, and in this case, as the other resin that constitutes the other monomer or the mixture that constitutes the copolymer, for example, an acrylic resin, a polyolefin-based resin, a urethane-based resin, and a modified polyphenylene ether. Resin etc. are illustrated.
　また、熱可塑性樹脂発泡シートは、熱可塑性樹脂層の少なくとも一方の面に、熱可塑性樹脂を主体とする熱可塑性樹脂非発泡層を備えても良い。熱可塑性樹脂非発泡層を構成する熱可塑性樹脂は、特に限定されない。例えばポリオレフィン（ポリエチレンやポリプロピレン等）、ポリ塩化ビニル、ポリスチレン、ポリエステル（ポリエチレンテレフタレート等）、及びアクリル樹脂等の一般的な熱可塑性樹脂を適宜使用することができる。これらは、それぞれ、単独重合体、他の単量体との共重合体、他の樹脂との混合物、又はそれらの組み合わせであって良い。好ましくは、ポリスチレン系樹脂又はポリオレフィン系樹脂である。なお、各層を積層するには、例えば共押出法、押出ラミネート法、及び熱ラミネート法等の各方法を採用することができる。 Further, the thermoplastic resin foamed sheet may include a thermoplastic resin non-foamed layer mainly composed of a thermoplastic resin on at least one surface of the thermoplastic resin layer. The thermoplastic resin forming the non-foamed thermoplastic resin layer is not particularly limited. For example, general thermoplastic resins such as polyolefins (polyethylene, polypropylene, etc.), polyvinyl chloride, polystyrene, polyesters (polyethylene terephthalate, etc.), and acrylic resins can be appropriately used. These may each be a homopolymer, a copolymer with another monomer, a mixture with another resin, or a combination thereof. Preferred are polystyrene-based resins and polyolefin-based resins. In addition, for laminating each layer, for example, each method such as a coextrusion method, an extrusion laminating method, and a thermal laminating method can be adopted.
　熱成形前における熱可塑性樹脂発泡シートの厚みは、特に限定されないが、１ｍｍ以上３ｍｍ以下であることが好ましい。熱可塑性樹脂発泡シートの厚みが１ｍｍよりも薄ければ剛性や断熱性が不十分となる可能性があり、３ｍｍより厚ければ成形性が不十分となる可能性がある。好ましい熱可塑性樹脂発泡シートの厚みは、例えば１．５ｍｍ以上２．５ｍｍ以下である。 The thickness of the thermoplastic resin foam sheet before thermoforming is not particularly limited, but is preferably 1 mm or more and 3 mm or less. If the thickness of the thermoplastic resin foam sheet is less than 1 mm, the rigidity and heat insulating property may be insufficient, and if it is more than 3 mm, the moldability may be insufficient. The preferable thickness of the thermoplastic resin foam sheet is, for example, 1.5 mm or more and 2.5 mm or less.
　熱成形前における熱可塑性樹脂発泡シート（特に、熱可塑性樹脂発泡層）の坪量は、特に限定されないが、１００ｇ／ｍ２以上４００ｇ／ｍ２以下であることが好ましい。坪量が１００ｇ／ｍ２未満であればシート成形によって深皿状の発泡容器本体２を形成するのが困難となり、坪量が４００ｇ／ｍ２超となると押出発泡成形によって熱可塑性樹脂発泡シートを形成するのが困難となる。好ましい熱可塑性樹脂発泡シートの坪量は、例えば１１０ｇ／ｍ２以上３００ｇ／ｍ２以下である。なお、熱可塑性樹脂発泡シートの坪量は、熱可塑性樹脂発泡シートの流れ方向に直交する方向（シート幅方向）に等間隔で３点、１０ｃｍ×１０ｃｍのシート片を切り出し、各シート片の質量を測定して、その平均質量として算出する。熱可塑性樹脂発泡シートの坪量は、原料樹脂の供給量又は溶融樹脂の押出量を調整することによって調整することができる。或いは、押出成形時の温度条件又は圧力条件を調整することによって調整することもできる。 The basis weight of the thermoplastic resin foam sheet (particularly, the thermoplastic resin foam layer) before thermoforming is not particularly limited, but is preferably 100 g/m 2 or more and 400 g/m 2 or less. If the basis weight is less than 100 g/m 2 , it becomes difficult to form the deep dish-shaped foam container body 2 by sheet molding, and if the basis weight exceeds 400 g/m 2, the thermoplastic resin foam sheet is formed by extrusion foam molding. Difficult to form. The preferable basis weight of the thermoplastic resin foam sheet is, for example, 110 g/m 2 or more and 300 g/m 2 or less. The basis weight of the thermoplastic resin foam sheet is three points at equal intervals in the direction orthogonal to the flow direction of the thermoplastic resin foam sheet (sheet width direction), 10 cm×10 cm sheet pieces are cut out, and the mass of each sheet piece is cut. Is calculated and calculated as the average mass. The basis weight of the thermoplastic resin foam sheet can be adjusted by adjusting the supply amount of the raw material resin or the extrusion amount of the molten resin. Alternatively, it can be adjusted by adjusting the temperature condition or pressure condition during extrusion molding.
　熱成形前における熱可塑性樹脂発泡シート（特に、熱可塑性樹脂発泡層）の曲げ弾性率は、特に限定されないが、１４０Ｍｐａ以上８００Ｍｐａ以下であることが好ましい。熱可塑性樹脂発泡シートの曲げ弾性率は、当該熱可塑性樹脂発泡シートの流れ方向（シート流れ方向）と、それに直交する方向（シート幅方向）とで異ならせても良い。この場合、シート流れ方向で２９０Ｍｐａ以上７８０Ｍｐａ以下であり、かつ、シート幅方向で１４０Ｍｐａ以上８００Ｍｐａ以下であることが好ましい。好ましい熱可塑性樹脂発泡シートの曲げ弾性率は、例えば、シート流れ方向で４４０Ｍｐａ以上６３０Ｍｐａ以下であり、シート幅方向で３４０Ｍｐａ以上６００Ｍｐａ以下である。ここで、熱可塑性樹脂発泡シートの曲げ弾性率は、本来的には炭素繊維強化プラスチックに適用されるべきＪＩＳ　Ｋ７０７４に倣いそれを一部変更した、以下の方法に従って測定するものとする。 The bending elastic modulus of the thermoplastic resin foam sheet (particularly, the thermoplastic resin foam layer) before thermoforming is not particularly limited, but it is preferably 140 MPa or more and 800 MPa or less. The bending elastic modulus of the thermoplastic resin foam sheet may be different between the flow direction of the thermoplastic resin foam sheet (sheet flow direction) and the direction orthogonal to it (sheet width direction). In this case, it is preferable that the sheet flow direction is 290 Mpa or more and 780 Mpa or less and the sheet width direction is 140 Mpa or more and 800 Mpa or less. The bending elastic modulus of a preferable thermoplastic resin foam sheet is, for example, 440 Mpa or more and 630 Mpa or less in the sheet flow direction and 340 Mpa or more and 600 Mpa or less in the sheet width direction. Here, the bending elastic modulus of the thermoplastic resin foam sheet is measured according to the following method, which is partially modified in accordance with JIS K7074 which should be originally applied to carbon fiber reinforced plastics.
　まず、熱可塑性樹脂発泡シートから、シート流れ方向及びシート幅方向のそれぞれについて、長さ１００ｍｍ×幅２５ｍｍの大きさの試験片を切り出す。支点間距離Ｌ＝６０ｍｍ、圧子の半径Ｒ１＝１０ｍｍ、支持台の半径Ｒ２＝１０ｍｍ、試験速度Ｖ＝１０ｍｍ／ｍｉｎに設定する。シート流れ方向及びシート幅方向のそれぞれの試験片について、曲げ荷重とたわみとの関係を測定によって取得する。得られた曲げ荷重－たわみ曲線の直線部の初期勾配から、曲げ弾性率を算出する。 First, a test piece of 100 mm in length and 25 mm in width is cut out from the thermoplastic resin foam sheet in each of the sheet flow direction and the sheet width direction. The distance L between the fulcrums is 60 mm, the radius R1 of the indenter is 10 mm, the radius R2 of the support is 10 mm, and the test speed V is 10 mm/min. For each test piece in the sheet flow direction and the sheet width direction, the relationship between bending load and deflection is acquired by measurement. The bending elastic modulus is calculated from the initial gradient of the linear portion of the obtained bending load-deflection curve.
　熱成形前における熱可塑性樹脂発泡シートの厚み、坪量、及び曲げ弾性率がそれぞれ上記の範囲内であると、当該熱可塑性樹脂発泡シートの熱成形によって得られる発泡容器本体２において、蓋体４の開閉に伴う弾性変形後に、しっかりと形状復元しやすい。 When the thickness, the basis weight, and the flexural modulus of the thermoplastic resin foam sheet before thermoforming are within the above ranges, in the foam container body 2 obtained by thermoforming the thermoplastic resin foam sheet, the lid 4 is formed. After elastic deformation due to opening and closing, it is easy to restore the shape firmly.
　発泡容器本体２は、上述した熱可塑性樹脂発泡シートを用いて、シート成形（熱成形）によって形成することができる。熱成形法としては、例えばプラグ成形法、マッチド・モールド成形法、ストレート成形法、ドレープ成形法、プラグアシスト成形法、プラグアシスト・リバースドロー成形法、エアスリップ成形法、スナップバック成形法、リバースドロー成形法、プラグ・アンド・リッジ成形法、及びリッジ成形法等が例示される。 The foam container body 2 can be formed by sheet molding (thermoforming) using the thermoplastic resin foam sheet described above. Examples of the thermoforming method include a plug forming method, a matched mold forming method, a straight forming method, a drape forming method, a plug assist forming method, a plug assist reverse draw forming method, an air slip forming method, a snapback forming method, and a reverse draw. A molding method, a plug-and-ridge molding method, a ridge molding method and the like are exemplified.
　本実施形態の熱可塑性樹脂発泡シートの熱成形によって得られる発泡容器本体２の密度は、特に限定されないが、０．０３ｇ／ｃｍ３以上０．３１ｇ／ｃｍ３以下であることが好ましい。発泡容器本体２の密度が０．０３ｇ／ｃｍ３未満であれば強度や高温での剛性が不十分な可能性があり、０．３１ｇ／ｃｍ３超となると断熱性が不十分な可能性がある。好ましい発泡容器本体２の密度は、例えば０．０６ｇ／ｃｍ３以上０．２２ｇ／ｃｍ３以下である。なお、発泡容器本体２の密度は、底面部２１から３ｃｍ×３ｃｍの試験片を切り出し、電子比重計（ミラージュ貿易社製、型式：ＥＤ－１２０Ｔ）を用いて水中置換法により測定する。 The density of the foam container body 2 obtained by thermoforming the thermoplastic resin foam sheet of the present embodiment is not particularly limited, but is preferably 0.03 g/cm 3 or more and 0.31 g/cm 3 or less. If the density of the foam container body 2 is less than 0.03 g/cm 3 , the strength and rigidity at high temperature may be insufficient, and if it exceeds 0.31 g/cm 3 , the heat insulating property may be insufficient. is there. The preferable density of the foam container body 2 is, for example, 0.06 g/cm 3 or more and 0.22 g/cm 3 or less. The density of the foam container body 2 is measured by cutting out a 3 cm×3 cm test piece from the bottom surface 21 and using an electronic hydrometer (Mirage Trading Co., Ltd., model: ED-120T) by the underwater substitution method.
　蓋体４は、発泡容器本体２に嵌合して、発泡容器本体２の上部開口を覆う。図１及び図２に示すように、蓋体４は、天面部４１と、蓋体周壁部４２と、フランジ部４３と、傾斜面部４４と、垂下面部４５と、内向き突起４６（蓋体逆テーパー部４７）と、蓋体延出縁部４８とを有している。天面部４１は、蓋体４の天井部を形成している。蓋体周壁部４２は、天面部４１の周縁から下方に延びている。蓋体周壁部４２は、下方に向かうに従って外側に向かって広がるように拡開している。 The lid 4 fits into the foam container body 2 and covers the upper opening of the foam container body 2. As shown in FIGS. 1 and 2, the lid 4 includes a top surface portion 41, a lid peripheral wall portion 42, a flange portion 43, an inclined surface portion 44, a hanging lower surface portion 45, and an inward projection 46 (lid body reverse portion). It has a taper portion 47) and a lid extending edge portion 48. The top surface portion 41 forms a ceiling portion of the lid body 4. The lid peripheral wall portion 42 extends downward from the peripheral edge of the top surface portion 41. The lid peripheral wall portion 42 expands so as to widen outward as it goes downward.
　フランジ部４３は、蓋体周壁部４２から外側に延びている。本実施形態では、フランジ部４３は、水平面に沿うように延在している。傾斜面部４４は、フランジ部４３の外縁からさらに外側に延びている。本実施形態では、傾斜面部４４は、下方に向かうに従って外側に向かって広がるように拡開している。垂下面部４５は、傾斜面部４４の外縁から下方に垂れ下がるように形成されている。この垂下面部４５に、内側に向かって突出する内向き突起４６が形成されており、この内向き突起４６における下方に向かうに従って内側に向かって窄まる部分が、蓋体逆テーパー部４７となっている。蓋体逆テーパー部４７は、発泡容器本体２の本体逆テーパー部２７に係合する。蓋体延出縁部４８は、内向き突起４６の下端部から、外側に延出するように形成されている。 The flange portion 43 extends outward from the lid peripheral wall portion 42. In the present embodiment, the flange portion 43 extends along the horizontal plane. The inclined surface portion 44 extends further outward from the outer edge of the flange portion 43. In the present embodiment, the inclined surface portion 44 expands so as to widen outward as it goes downward. The hanging lower surface portion 45 is formed so as to hang downward from the outer edge of the inclined surface portion 44. An inward projection 46 protruding inward is formed on the hanging bottom surface portion 45, and a portion of the inward projection 46 that narrows inward as it goes downward serves as a lid reverse taper portion 47. There is. The lid reverse taper portion 47 engages with the body reverse taper portion 27 of the foam container body 2. The lid extending edge portion 48 is formed so as to extend outward from the lower end portion of the inward protrusion 46.
　図４の下段に示すように、発泡容器本体２と蓋体４とが嵌合したとき、発泡容器本体２の第一延在部２３と第二延在部２４との境界部分（後述する第一境界部３１）に、蓋体４のフランジ部４３が載置される。また、発泡容器本体２の第二延在部２４に、蓋体４の傾斜面部４４が載置される。また、発泡容器本体２の第二延在部２４と本体逆テーパー部２７との境界部分（後述する第二境界部３２）に、蓋体４の垂下面部４５が外側から当接する。また、発泡容器本体２の本体逆テーパー部２７に、蓋体４の蓋体逆テーパー部４７が外側から係合する。この互いに係合する本体逆テーパー部２７と蓋体逆テーパー部４７とにより、“逆テーパー係合部”が形成される。また、発泡容器本体２の本体延出縁部２８に、蓋体４の蓋体延出縁部４８が載置される。このとき、蓋体延出縁部４８の外縁は、本体延出縁部２８の外縁よりも内側に位置される。 As shown in the lower part of FIG. 4, when the foam container body 2 and the lid body 4 are fitted to each other, the boundary portion between the first extending portion 23 and the second extending portion 24 of the foam container body 2 (see The flange portion 43 of the lid 4 is placed on the one boundary portion 31). Further, the inclined surface portion 44 of the lid 4 is placed on the second extending portion 24 of the foam container body 2. Further, the hanging bottom surface portion 45 of the lid 4 comes into contact with the boundary portion (the second boundary portion 32 described later) between the second extending portion 24 of the foam container body 2 and the body reverse taper portion 27 from the outside. Further, the lid reverse taper portion 47 of the lid body 4 engages with the body reverse taper portion 27 of the foam container body 2 from the outside. The “reverse taper engaging portion” is formed by the body reverse taper portion 27 and the lid reverse taper portion 47 which are engaged with each other. Further, the lid extending edge 48 of the lid 4 is placed on the body extending edge 28 of the foam container body 2. At this time, the outer edge of the lid extending edge portion 48 is located inside the outer edge of the main body extending edge portion 28.
　図３に示すように、本実施形態の包装用容器１において、発泡容器本体２の第一延在部２３と第二延在部２４との境界に位置する第一境界部３１の厚みＴ１は、第一延在部２３の厚みＴ３及び第二延在部２４の厚みＴ４よりも小さい。本実施形態では、発泡容器本体２における第一境界部３１の内面側には、凹状に窪む第一括れ部３３が形成されている。そして、この第一括れ部３３の存在により、第一境界部３１の厚みＴ１が第一延在部２３の厚みＴ３及び第二延在部２４の厚みＴ４よりも小さくなっている。第一境界部３１の厚みＴ１は、例えば、第一延在部２３の厚みＴ３の０．５倍～０．９倍程度であって良く、また、第二延在部２４の厚みＴ４の０．３倍～０．９倍程度であって良い。 As shown in FIG. 3, in the packaging container 1 of the present embodiment, the thickness T1 of the first boundary portion 31 located at the boundary between the first extending portion 23 and the second extending portion 24 of the foam container body 2 is It is smaller than the thickness T3 of the first extending portion 23 and the thickness T4 of the second extending portion 24. In the present embodiment, a first collective portion 33 that is recessed in a concave shape is formed on the inner surface side of the first boundary portion 31 in the foam container body 2. The thickness T1 of the first boundary portion 31 is smaller than the thickness T3 of the first extending portion 23 and the thickness T4 of the second extending portion 24 due to the existence of the first bundled portion 33. The thickness T1 of the first boundary portion 31 may be, for example, about 0.5 to 0.9 times the thickness T3 of the first extending portion 23, and 0 of the thickness T4 of the second extending portion 24. It may be about 3 to 0.9 times.
　さらに本実施形態では、第二延在部２４と本体逆テーパー部２７との境界に位置する第二境界部３２の厚みＴ２は、第二延在部２４の厚みＴ４及び本体逆テーパー部２７の厚みＴ５よりも小さい。本実施形態では、発泡容器本体２における第二境界部３２の内面側には、凹状に窪む第二括れ部３４が形成されている。そして、この第二括れ部３４の存在により、第二境界部３２の厚みＴ２が第二延在部２４の厚みＴ４及び本体逆テーパー部２７の厚みＴ５よりも小さくなっている。第二境界部３２の厚みＴ２は、例えば、第二延在部２４の厚みＴ４の０．３倍～０．９倍程度であって良く、また、本体逆テーパー部２７の厚みＴ５の０．５倍～０．９倍程度であって良い。 Further, in the present embodiment, the thickness T2 of the second boundary portion 32 located at the boundary between the second extending portion 24 and the body reverse taper portion 27 is equal to the thickness T4 of the second extending portion 24 and the body reverse taper portion 27. It is smaller than the thickness T5. In the present embodiment, a second constricted portion 34 that is recessed in a concave shape is formed on the inner surface side of the second boundary portion 32 in the foam container body 2. Due to the existence of the second constricted portion 34, the thickness T2 of the second boundary portion 32 is smaller than the thickness T4 of the second extending portion 24 and the thickness T5 of the main body reverse taper portion 27. The thickness T2 of the second boundary portion 32 may be, for example, about 0.3 to 0.9 times the thickness T4 of the second extending portion 24, and the thickness T5 of the main body reverse taper portion 27 may be 0. It may be about 5 to 0.9 times.
　また、本実施形態では、第一境界部３１の厚みＴ１と第二境界部３２の厚みＴ２とが同程度である。また、第一延在部２３の厚みＴ３と本体逆テーパー部２７の厚みＴ５も同程度であり、これらに比べて第二延在部２４の厚みＴ４が大きい。すなわち、本実施形態では、第一延在部２３の厚みＴ３及び本体逆テーパー部２７の厚みＴ５は、第二延在部２４の厚みＴ４よりも小さく、その第一延在部２３の厚みＴ３及び本体逆テーパー部２７の厚みＴ５よりも、第一境界部３１の厚みＴ１及び第二境界部３２の厚みＴ２がさらに小さくなっている。 Further, in the present embodiment, the thickness T1 of the first boundary portion 31 and the thickness T2 of the second boundary portion 32 are substantially the same. In addition, the thickness T3 of the first extending portion 23 and the thickness T5 of the main body reverse taper portion 27 are about the same, and the thickness T4 of the second extending portion 24 is larger than these. That is, in the present embodiment, the thickness T3 of the first extending portion 23 and the thickness T5 of the main body inverse taper portion 27 are smaller than the thickness T4 of the second extending portion 24, and the thickness T3 of the first extending portion 23. Further, the thickness T1 of the first boundary portion 31 and the thickness T2 of the second boundary portion 32 are smaller than the thickness T5 of the main body reverse taper portion 27.
　上述したように、本体逆テーパー部２７及び蓋体逆テーパー部４７は、いずれも、下方に向かうに従って内側に向かって窄まるように形成されている。このため、本体逆テーパー部２７と蓋体逆テーパー部４７とが係合してなる“逆テーパー係合部”も、下方に向かうに従って内側に向かうように形成されている。鉛直線に対する逆テーパー係合部の傾きθは、例えば１５°～７５°であると好適である。また、逆テーパー係合部による係合深さＤ（内向き突起４６の外面側に形成される窪みの深さ）は、例えば０．５ｍｍ～４０ｍｍであると好適である。 As described above, both the main body reverse taper portion 27 and the lid reverse taper portion 47 are formed so as to narrow inward as they go downward. Therefore, the “reverse taper engaging portion” formed by engaging the main body reverse taper portion 27 and the lid reverse taper portion 47 is also formed so as to face inward as it goes downward. The inclination θ of the reverse taper engaging portion with respect to the vertical line is preferably 15° to 75°, for example. Further, the engagement depth D (depth of the recess formed on the outer surface side of the inward projection 46) by the reverse taper engagement portion is preferably 0.5 mm to 40 mm, for example.
　図４の上段に示すように、閉蓋時には、その両側の第一延在部２３及び第二延在部２４に対して相対的に厚みが小さい第一境界部３１が、発泡容器本体２の弾性変形の支点となって、第二延在部２４及び本体逆テーパー部２７の全体を内方側にスムーズに移動させることができる。また、その両側の第二延在部２４及び本体逆テーパー部２７に対して相対的に厚みが小さい第二境界部３２も、発泡容器本体２の弾性変形のもう１つの支点となって、本体逆テーパー部２７を内方側にスムーズに移動させることができる。このように、第一境界部３１及び第二境界部３２の両方が支点となって、第二延在部２４及び本体逆テーパー部２７の全体の可動範囲を広げつつ、本体逆テーパー部２７を内方側にスムーズに移動させることができる。よって、閉蓋操作を容易に行うことができる。 As shown in the upper part of FIG. 4, when the lid is closed, the first boundary portions 31 having a relatively small thickness with respect to the first extending portion 23 and the second extending portion 24 on both sides of the lid are provided in the foam container body 2. This serves as a fulcrum for elastic deformation, and the entire second extending portion 24 and the main body reverse taper portion 27 can be smoothly moved inward. Further, the second boundary portions 32, which have a relatively small thickness with respect to the second extending portion 24 and the main body reverse taper portion 27 on both sides thereof, also serve as another fulcrum of elastic deformation of the foam container main body 2 and become the main body. The reverse taper portion 27 can be smoothly moved inward. In this way, both the first boundary portion 31 and the second boundary portion 32 serve as fulcrums, and the main body reverse taper portion 27 is expanded while widening the entire movable range of the second extending portion 24 and the body reverse taper portion 27. It can be moved smoothly inward. Therefore, the lid closing operation can be easily performed.
　閉蓋後は、図４の下段に示すように、発泡容器本体２が形状復元して、本体逆テーパー部２７と蓋体逆テーパー部４７とがしっかりと係合する。よって、本体逆テーパー部２７と蓋体逆テーパー部４７とが係合してなる逆テーパー係合部の嵌合力を高めることができる。よって、例えば食品等の被収容物を収容した状態での包装用容器１の搬送時や陳列時等に、発泡容器本体２から蓋体４が外れにくい。 After closing the lid, as shown in the lower part of FIG. 4, the foam container body 2 restores its shape, and the body reverse taper portion 27 and the lid reverse taper portion 47 are firmly engaged. Therefore, the fitting force of the reverse taper engaging portion formed by the main body reverse taper portion 27 and the lid reverse taper portion 47 engaging with each other can be increased. Therefore, for example, the lid body 4 is unlikely to come off from the foam container body 2 when the packaging container 1 is transported or displayed in a state of containing an object such as food.
　図示は省略するが、開蓋時にも、第一境界部３１及び第二境界部３２の両方が支点となって、第二延在部２４及び本体逆テーパー部２７の全体の可動範囲を広げつつ、本体逆テーパー部２７を内方側にスムーズに移動させることができる。よって、開蓋操作を容易に行うことができる。 Although illustration is omitted, even when the lid is opened, both the first boundary portion 31 and the second boundary portion 32 serve as fulcrums to expand the entire movable range of the second extending portion 24 and the main body reverse taper portion 27. The main body reverse taper portion 27 can be smoothly moved inward. Therefore, the lid opening operation can be easily performed.
　こうして、本実施形態の包装用容器１によれば、蓋体４の開閉操作を容易に行うことができるとともに、閉蓋状態での発泡容器本体２と蓋体４との嵌合力を高めることができる。よって、食品等の被収容物を包装用容器１に収容するための作業を容易化することができるとともに、当該被収容物を収容した包装用容器１において発泡容器本体２から蓋体４を外れにくくすることができる。 Thus, according to the packaging container 1 of the present embodiment, it is possible to easily perform the opening/closing operation of the lid body 4 and increase the fitting force between the foam container body 2 and the lid body 4 in the closed state. it can. Therefore, it is possible to facilitate the work for accommodating an object to be contained such as food in the packaging container 1, and remove the lid 4 from the foam container body 2 in the packaging container 1 accommodating the object to be accommodated. It can be difficult.
〔その他の実施形態〕
（１）上記の実施形態では、第一境界部３１の厚みＴ１が第一延在部２３の厚みＴ３及び第二延在部２４の厚みＴ４よりも小さく、かつ、第二境界部３２の厚みＴ２が第二延在部２４の厚みＴ４及び本体逆テーパー部２７の厚みＴ５よりも小さい構成を例として説明した。しかし、そのような構成に限定されることなく、例えば第一境界部３１の厚みＴ１が第一延在部２３の厚みＴ３及び第二延在部２４の厚みＴ４よりも小さいだけで、第二境界部３２の厚みＴ２が、第二延在部２４の厚みＴ４及び本体逆テーパー部２７の厚みＴ５の少なくとも一方以上であっても良い。この場合における包装用容器１は、
　熱可塑性樹脂発泡体からなる発泡容器本体２と、前記発泡容器本体２に嵌合する蓋体４と、を備える包装用容器１であって、
　前記発泡容器本体２は、本体周壁部２２から外側に延びる第一延在部２３と、前記第一延在部２３の外縁からさらに外側に延びる第二延在部２４と、前記第二延在部２４よりも周縁側に設けられて前記蓋体４の蓋体逆テーパー部４７に係合する本体逆テーパー部２７と、を有し、
　前記第一延在部２３と前記第二延在部２４との境界に位置する第一境界部３１の厚みＴ１が、前記第一延在部２３の厚みＴ３及び前記第二延在部２４の厚みＴ４よりも小さい、
という構成を備える。 [Other Embodiments]
(1) In the above embodiment, the thickness T1 of the first boundary portion 31 is smaller than the thickness T3 of the first extending portion 23 and the thickness T4 of the second extending portion 24, and the thickness of the second boundary portion 32. The configuration in which T2 is smaller than the thickness T4 of the second extending portion 24 and the thickness T5 of the main body reverse taper portion 27 has been described as an example. However, without being limited to such a configuration, for example, the thickness T1 of the first boundary portion 31 is smaller than the thickness T3 of the first extending portion 23 and the thickness T4 of the second extending portion 24, and The thickness T2 of the boundary portion 32 may be at least one of the thickness T4 of the second extending portion 24 and the thickness T5 of the main body reverse taper portion 27. The packaging container 1 in this case is
A packaging container 1 comprising: a foam container body 2 made of a thermoplastic resin foam; and a lid 4 fitted to the foam container body 2.
The foam container body 2 includes a first extending portion 23 extending outward from the main body peripheral wall portion 22, a second extending portion 24 extending further outward from an outer edge of the first extending portion 23, and the second extending portion. A main body reverse taper portion 27 which is provided on the peripheral side of the portion 24 and engages with the lid reverse taper portion 47 of the lid body 4,
The thickness T1 of the first boundary portion 31 located at the boundary between the first extending portion 23 and the second extending portion 24 is equal to the thickness T3 of the first extending portion 23 and the thickness of the second extending portion 24. Smaller than thickness T4,
It has a configuration.
　或いは、例えば第二境界部３２の厚みＴ２が第二延在部２４の厚みＴ４及び本体逆テーパー部２７の厚みＴ５よりも小さいだけで、第一境界部３１の厚みＴ１が、第一延在部２３の厚みＴ３及び第二延在部２４の厚みＴ４の少なくとも一方以上であっても良い。この場合における包装用容器１は、
　熱可塑性樹脂発泡体からなる発泡容器本体２と、前記発泡容器本体２に嵌合する蓋体４と、を備える包装用容器１であって、
　前記発泡容器本体２は、本体周壁部２２から外側に延びる第一延在部２３と、前記第一延在部２３の外縁からさらに外側に延びる第二延在部２４と、前記第二延在部２４よりも周縁側に設けられて前記蓋体４の蓋体逆テーパー部４７に係合する本体逆テーパー部２７と、を有し、
　前記第二延在部２４と本体逆テーパー部２７との境界に位置する第二境界部３２の厚みＴ２が、第二延在部２４の厚みＴ４及び本体逆テーパー部２７の厚みＴ５よりも小さい、
という構成を備える。 Alternatively, for example, the thickness T2 of the second boundary portion 32 is only smaller than the thickness T4 of the second extending portion 24 and the thickness T5 of the body reverse taper portion 27, and the thickness T1 of the first boundary portion 31 is the first extending portion. It may be at least one of the thickness T3 of the portion 23 and the thickness T4 of the second extending portion 24. The packaging container 1 in this case is
A packaging container 1 comprising: a foam container body 2 made of a thermoplastic resin foam; and a lid 4 fitted to the foam container body 2.
The foam container body 2 includes a first extending portion 23 extending outward from the main body peripheral wall portion 22, a second extending portion 24 extending further outward from an outer edge of the first extending portion 23, and the second extending portion. A main body reverse taper portion 27 which is provided on the peripheral side of the portion 24 and engages with the lid reverse taper portion 47 of the lid body 4,
The thickness T2 of the second boundary portion 32 located at the boundary between the second extending portion 24 and the body reverse taper portion 27 is smaller than the thickness T4 of the second extending portion 24 and the thickness T5 of the body reverse taper portion 27. ,
It has a configuration.
（２）上記の実施形態では、発泡容器本体２が、上方に向かうに従って外側に向かって広がる第一延在部２３と、下方に向かうに従って外側に向かって広がる第二延在部２４とを有する構成を例として説明した。しかし、そのような構成に限定されることなく、発泡容器本体２が水平面に沿うように延在する“本体フランジ部”を有しても良い。そのような本体フランジ部は、例えば図５に示すように第一延在部２３により構成されても良いし、図６に示すように第二延在部２４により構成されても良い。後者の場合、第一延在部２３は、本体周壁部２２から明確に区別される部位として構成されても良いし、本体周壁部２２における上側領域によって構成されても良い。 (2) In the above embodiment, the foam container body 2 has the first extending portion 23 that expands outward as it goes upward, and the second extending portion 24 that expands outward as it goes downward. The configuration has been described as an example. However, without being limited to such a configuration, the foam container main body 2 may have a “main body flange portion” extending along a horizontal plane. Such a main body flange portion may be constituted by the first extending portion 23 as shown in FIG. 5, or may be constituted by the second extending portion 24 as shown in FIG. In the latter case, the first extending portion 23 may be configured as a portion that is clearly distinguished from the main body peripheral wall portion 22, or may be configured by an upper region of the main body peripheral wall portion 22.
（３）上記の実施形態では、発泡容器本体２が第一延在部２３、第二延在部２４、及び本体逆テーパー部２７を具備することを前提として、第一境界部３１の厚みＴ１が第一延在部２３の厚みＴ３及び第二延在部２４の厚みＴ４よりも小さいか、又は、第二境界部３２の厚みＴ２が第二延在部２４の厚みＴ４及び本体逆テーパー部２７の厚みＴ５よりも小さい構成を例として説明した。しかし、そのような構成に限定されることなく、例えば図７に示すように、発泡容器本体２が第一延在部２３及び第二延在部２４に対応する代替構成としてフランジ部（本体フランジ部）２５を備えても良い。フランジ部２５は、水平面に沿って延在するように設けられても良いし、水平面に対して傾斜して延在するように設けられても良い。そして、かかる構成を前提として、フランジ部２５と本体逆テーパー部２７との境界に位置する境界部３６の厚みＴ６が、フランジ部２５の厚みＴ７及び本体逆テーパー部２７の厚みＴ５よりも小さく構成されると良い。 (3) In the above embodiment, the foam container body 2 is provided with the first extending portion 23, the second extending portion 24, and the body reverse taper portion 27, and the thickness T1 of the first boundary portion 31. Is smaller than the thickness T3 of the first extending portion 23 and the thickness T4 of the second extending portion 24, or the thickness T2 of the second boundary portion 32 is the thickness T4 of the second extending portion 24 and the body reverse taper portion. The structure having the thickness smaller than the thickness T5 of 27 has been described as an example. However, without being limited to such a configuration, as shown in FIG. 7, for example, as a substitute configuration in which the foam container body 2 corresponds to the first extending portion 23 and the second extending portion 24, a flange portion (body flange Part) 25 may be provided. The flange portion 25 may be provided so as to extend along the horizontal plane, or may be provided so as to extend while being inclined with respect to the horizontal plane. Then, on the premise of such a configuration, the thickness T6 of the boundary portion 36 located at the boundary between the flange portion 25 and the body reverse taper portion 27 is smaller than the thickness T7 of the flange portion 25 and the thickness T5 of the body reverse taper portion 27. It is good to be done.
（４）上記の実施形態では、発泡容器本体２を構成する熱可塑性樹脂発泡シートとして、熱成形前における厚み、坪量、及び曲げ弾性率がそれぞれ特定の数値範囲内であるものを用いる構成を例として説明した。しかし、そのような構成に限定されることなく、熱成形前における熱可塑性樹脂発泡シートの物性（上述した各特性値）は任意であって良い。 (4) In the above-described embodiment, as the thermoplastic resin foam sheet that constitutes the foam container body 2, a structure in which the thickness, the basis weight, and the flexural modulus before thermoforming are within specific numerical ranges is used. Described as an example. However, without being limited to such a configuration, the physical properties (the above-mentioned characteristic values) of the thermoplastic resin foam sheet before thermoforming may be arbitrary.
（５）本体逆テーパー部２７と蓋体逆テーパー部４７とが係合してなる逆テーパー係合部は、全周に亘って設けられても良いし、断続的（間欠的）に設けられても良い。後者の場合、本体逆テーパー部２７が全周に亘って設けられるとともに蓋体逆テーパー部４７が断続的（間欠的）に設けられても良いし、本体逆テーパー部２７及び蓋体逆テーパー部４７の両方が互いに対応する位置に断続的（間欠的）に設けられても良い。 (5) The reverse taper engaging portion formed by engaging the main body reverse taper portion 27 and the lid reverse taper portion 47 may be provided over the entire circumference or may be provided intermittently (intermittently). May be. In the latter case, the body reverse taper portion 27 may be provided over the entire circumference and the lid reverse taper portion 47 may be provided intermittently (intermittently), or the body reverse taper portion 27 and the lid reverse taper portion. Both 47 may be provided intermittently (intermittently) at positions corresponding to each other.
（６）包装用容器１の全体形状は、任意であって良い。包装用容器１の全体形状としては、例えば矩形状（正方形状，長方形状，台形状）、多角形状（五角形状，六角形状，八角形状，・・・）、真円状、及び楕円状等、各種形状を採用することができる。 (6) The overall shape of the packaging container 1 may be arbitrary. As the overall shape of the packaging container 1, for example, a rectangular shape (square shape, rectangular shape, trapezoidal shape), a polygonal shape (pentagonal shape, hexagonal shape, octagonal shape,... ), a perfect circle shape, an elliptical shape, etc. Various shapes can be adopted.
（７）上述した各実施形態（上記の実施形態及びその他の実施形態を含む；以下同様）で開示される構成は、矛盾が生じない限り、他の実施形態で開示される構成と組み合わせて適用することも可能である。その他の構成に関しても、本明細書において開示された実施形態は全ての点で例示であって、本開示の趣旨を逸脱しない範囲内で適宜改変することが可能である。 (7) The configurations disclosed in the above-described embodiments (including the above-described embodiments and other embodiments; the same applies hereinafter) are applied in combination with the configurations disclosed in the other embodiments unless a contradiction occurs. It is also possible to do so. Regarding other configurations, the embodiments disclosed in the present specification are examples in all respects, and can be appropriately modified without departing from the gist of the present disclosure.
１　　　　包装用容器
２　　　　発泡容器本体
４　　　　蓋体
２２　　　本体周壁部（周壁部）
２３　　　第一延在部
２４　　　第二延在部
２５　　　フランジ部
２７　　　本体逆テーパー部
３１　　　第一境界部
３２　　　第二境界部
３３　　　境界部
４７　　　蓋体逆テーパー部
Ｔ１　　　第一境界部３１の厚み
Ｔ２　　　第二境界部３２の厚み
Ｔ３　　　第一延在部２３の厚み
Ｔ４　　　第二延在部２４の厚み
Ｔ５　　　本体逆テーパー部２７の厚み 1 Packaging Container 2 Foam Container Main Body 4 Lid 22 Main Body Peripheral Wall (Peripheral Wall)
23 1st extension part 24 2nd extension part 25 Flange part 27 Main part reverse taper part 31 1st boundary part 32 2nd boundary part 33 boundary part 47 Lid reverse taper part T1 Thickness T2 of the 1st boundary part 31 2nd Thickness T3 of the boundary portion 32 Thickness T4 of the first extending portion 23 Thickness T5 of the second extending portion 24 Thickness of the body reverse taper portion 27

Claims (7)

  1. 　熱可塑性樹脂発泡体からなる発泡容器本体と、前記発泡容器本体に嵌合する蓋体と、を備える包装用容器であって、
    　前記発泡容器本体は、周壁部から外側に延びる第一延在部と、前記第一延在部の外縁からさらに外側に延びる第二延在部と、前記第二延在部よりも周縁側に設けられて前記蓋体の蓋体逆テーパー部に係合する本体逆テーパー部と、を有し、
    　前記第一延在部と前記第二延在部との境界に位置する第一境界部の厚みが、前記第一延在部の厚み及び前記第二延在部の厚みよりも小さいか、又は、前記第二延在部と前記本体逆テーパー部との境界に位置する第二境界部の厚みが、前記第二延在部の厚み及び前記本体逆テーパー部の厚みよりも小さい包装用容器。     A packaging container comprising a foam container body made of a thermoplastic resin foam, and a lid fitted to the foam container body,
    The foam container main body has a first extending portion that extends outward from the peripheral wall portion, a second extending portion that extends further outward from an outer edge of the first extending portion, and a peripheral side of the second extending portion. And a main body reverse taper portion which is provided and engages with the lid reverse taper portion of the lid body,
    The thickness of the first boundary portion located at the boundary between the first extending portion and the second extending portion is smaller than the thickness of the first extending portion and the thickness of the second extending portion, or A packaging container in which a thickness of a second boundary portion located at a boundary between the second extending portion and the main body reverse taper portion is smaller than a thickness of the second extending portion and a thickness of the main body reverse taper portion.
  2. 　前記第一境界部の厚みが、前記第一延在部の厚み及び前記第二延在部の厚みよりも小さく、かつ、前記第二境界部の厚みが、前記第二延在部の厚み及び前記本体逆テーパー部の厚みよりも小さい請求項１に記載の包装用容器。 The thickness of the first boundary portion is smaller than the thickness of the first extending portion and the thickness of the second extending portion, and the thickness of the second boundary portion is the thickness of the second extending portion and The packaging container according to claim 1, wherein the packaging container has a thickness smaller than the thickness of the body reverse taper portion.
  3. 　前記発泡容器本体の密度が、０．０３ｇ／ｃｍ３以上０．３１ｇ／ｃｍ３以下である請求項１又は２に記載の包装用容器。 The packaging container according to claim 1 or 2, wherein the foam container body has a density of 0.03 g/cm 3 or more and 0.31 g/cm 3 or less.
  4. 　前記発泡容器本体は、熱可塑性樹脂発泡シートの熱成形によって形成されるものであり、
    　熱成形前における前記熱可塑性樹脂発泡シートの曲げ弾性率が、シート流れ方向で２９０Ｍｐａ以上７８０Ｍｐａ以下であり、かつ、シート幅方向で１４０Ｍｐａ以上８００Ｍｐａ以下である請求項１から３のいずれか一項に記載の包装用容器。     The foam container body is formed by thermoforming a thermoplastic resin foam sheet,
    4. The bending elastic modulus of the thermoplastic resin foam sheet before thermoforming is 290 Mpa or more and 780 Mpa or less in the sheet flow direction, and 140 Mpa or more and 800 Mpa or less in the sheet width direction. The packaging container described.
  5. 　前記発泡容器本体は、熱可塑性樹脂発泡シートの熱成形によって形成されるものであり、
    　熱成形前における前記熱可塑性樹脂発泡シートの厚みが、１ｍｍ以上３ｍｍ以下である請求項１から４のいずれか一項に記載の包装用容器。     The foam container body is formed by thermoforming a thermoplastic resin foam sheet,
    The packaging container according to any one of claims 1 to 4, wherein a thickness of the thermoplastic resin foam sheet before thermoforming is 1 mm or more and 3 mm or less.
  6. 　前記発泡容器本体は、熱可塑性樹脂発泡シートの熱成形によって形成されるものであり、
    　熱成形前における前記熱可塑性樹脂発泡シートの坪量が、１００ｇ／ｍ２以上４００ｇ／ｍ２以下である請求項１から５のいずれか一項に記載の包装用容器。     The foam container body is formed by thermoforming a thermoplastic resin foam sheet,
    The packaging container according to any one of claims 1 to 5, wherein a basis weight of the thermoplastic resin foam sheet before thermoforming is 100 g/m 2 or more and 400 g/m 2 or less.
  7. 　熱可塑性樹脂発泡体からなる発泡容器本体と、前記発泡容器本体に嵌合する蓋体と、を備える包装用容器であって、
    　前記発泡容器本体は、周壁部から外側に延びるフランジ部と、前記フランジ部よりも周縁側に設けられて前記蓋体の蓋体逆テーパー部に係合する本体逆テーパー部と、を有し、
    　前記フランジ部と前記本体逆テーパー部との境界に位置する境界部の厚みが、前記フランジ部の厚み及び前記本体逆テーパー部の厚みよりも小さい包装用容器。     A packaging container comprising a foam container body made of a thermoplastic resin foam, and a lid fitted to the foam container body,
    The foam container main body has a flange portion extending outward from the peripheral wall portion, and a main body reverse taper portion which is provided on the peripheral side of the flange portion and engages with the lid reverse taper portion of the lid body,
    A packaging container in which a thickness of a boundary portion located at a boundary between the flange portion and the main body reverse taper portion is smaller than a thickness of the flange portion and a thickness of the main body reverse taper portion.
PCT/JP2019/048928 2018-12-18 2019-12-13 Packaging container WO2020129842A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201980081566.2A CN113165785B (en) 2018-12-18 2019-12-13 Container for packaging

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2018-236499 2018-12-18
JP2018236499A JP6868906B2 (en) 2018-12-18 2018-12-18 Packaging container and manufacturing method of packaging container

Publications (1)

Publication Number Publication Date
WO2020129842A1 true WO2020129842A1 (en) 2020-06-25

Family

ID=71101195

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2019/048928 WO2020129842A1 (en) 2018-12-18 2019-12-13 Packaging container

Country Status (3)

Country Link
JP (1) JP6868906B2 (en)
CN (1) CN113165785B (en)
WO (1) WO2020129842A1 (en)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5377860A (en) * 1993-09-14 1995-01-03 James River Corporation Of Virginia Double seal food container
JP2002173160A (en) * 2000-12-06 2002-06-18 Japan Xanpak Corp Container with lid
JP2004075123A (en) * 2002-08-19 2004-03-11 K P Puratetsuku:Kk Vessel
JP2007186230A (en) * 2006-01-13 2007-07-26 Fp Corp Packaging vessel
JP2011020722A (en) * 2009-07-17 2011-02-03 Chuo Kagaku Co Ltd Packaging container

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6170696B1 (en) * 1996-03-04 2001-01-09 The Glad Products Company Sealing container
US6547093B1 (en) * 2000-02-28 2003-04-15 General Mills, Inc. Plastic container for food products
US7357272B2 (en) * 2004-06-30 2008-04-15 The Glad Products Company Ventable container assembly
JP4686331B2 (en) * 2005-10-24 2011-05-25 大日本印刷株式会社 One-touch cap
NZ569780A (en) * 2006-01-18 2011-04-29 Glad Products Co Containers with interlocking covers and nestable tabs
WO2008119111A1 (en) * 2007-03-30 2008-10-09 Impress Australia Pty Ltd A closure system
CN202006904U (en) * 2011-03-11 2011-10-12 吴深雄 Ultrathin sealed fast-food box
AU2011365704A1 (en) * 2011-04-12 2013-10-24 Poranunt Co., Ltd. Sealing and locking means for plastic containers and lids, and to containers using such locking means
CN206798051U (en) * 2017-06-08 2017-12-26 福建绿威环保餐具有限公司 A kind of mess-tin

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5377860A (en) * 1993-09-14 1995-01-03 James River Corporation Of Virginia Double seal food container
JP2002173160A (en) * 2000-12-06 2002-06-18 Japan Xanpak Corp Container with lid
JP2004075123A (en) * 2002-08-19 2004-03-11 K P Puratetsuku:Kk Vessel
JP2007186230A (en) * 2006-01-13 2007-07-26 Fp Corp Packaging vessel
JP2011020722A (en) * 2009-07-17 2011-02-03 Chuo Kagaku Co Ltd Packaging container

Also Published As

Publication number Publication date
JP2020097438A (en) 2020-06-25
JP6868906B2 (en) 2021-05-12
CN113165785B (en) 2021-11-12
CN113165785A (en) 2021-07-23

Similar Documents

Publication Publication Date Title
JP6630405B2 (en) Storage container system
US9758292B2 (en) Insulated container
WO2020129842A1 (en) Packaging container
JP6373141B2 (en) Laminated foam sheet for thermoforming, method for producing laminated foam sheet for thermoforming, and food or packaging container
JP4618712B2 (en) Packaging container
JP5634902B2 (en) Packaging container
JP7030598B2 (en) Laminated foam sheet and molded body
JP4944071B2 (en) Packaging container
JP2010058830A (en) Packaging container
JP2017193668A (en) Thermoplastic polyester-based resin foam container
JP7109043B2 (en) Distortion suppression structure for resin molded product to be container body of foamed resin sheet packaging container and resin molded product to be container body using the structure
JP2022074628A (en) Packaging container
JP5789447B2 (en) Packaging container lid
JP5684002B2 (en) Cold storage container
JP6797594B2 (en) Foamed resin container and its manufacturing method
JP5389119B2 (en) Packaging container
JP2009067476A (en) Packaging container with thin-walled part
JP5230323B2 (en) Cold storage container
JP3223407U (en) Thermoplastic polyester resin foam container
JP2544551Y2 (en) Foam resin container
JP6802400B1 (en) Foamed resin container body and packaging container using it
JP2005225554A (en) Box container made of synthetic resin foam and manufacturing method therefor
JP7299032B2 (en) Laminated foam sheet and molding
JP2020164244A (en) Polystyrene based resin foamed container
JP6063638B2 (en) Foamed resin container

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 19900326

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 19900326

Country of ref document: EP

Kind code of ref document: A1