JP2013237480A - Cup-shaped paper container - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cup-shaped paper container which does not burn easily regardless of the shape of its bottom face member even when heated directly in a microwave oven.SOLUTION: A circular truncated cone-shaped trunk member having an upper portion in a widened shape is built by sealing a trunk seal portion of a fan-shaped blank comprising a laminated material having a paper layer and thermoplastic resin layers provided on both faces of the paper layer. A bottom member is made by forming a laminated material into a circular shape, the laminated material including a thermoplastic resin layer but not including a paper layer. A cup-shaped paper container has the trunk member and the bottom member, and is built by folding a lower portion of the trunk member to wrap a circumferential edge portion of the bottom member bent downward, and thermally sealing them together.

Description

  The present invention relates to a paper container for storing food products, beverages, and the like, and particularly to a cup-shaped paper container suitable for cooking by a microwave oven.

  As containers for storing food and beverages, containers of various shapes and various shapes are used. In recent years, containers using paper, which is a reproducible resource, have attracted particular attention against the background of increasing awareness of global environmental protection. Among them, the cup-shaped paper container is widely used as a container for storing various foods, beverages and the like in addition to the original paper cup use because of its ease of use and ease of manufacture.

  As a general shape of the cup-shaped paper container, as shown in FIGS. 5 (A) and 5 (B), the bottom member (200) and the bottom member (300) are formed into a reverse tray shape. The bottom sleeve (yarn) (250) is generally formed by winding the lower end of the body member (200) around the peripheral edge (310) of 300) and thermocompression bonding. The upper end portion of the body member (200) is crushed after wrap-up forming to form a flange portion (230), and a separately prepared lid member (not shown) is detachably sealed and sealed.

  When the contents are put into such a raised bottom paper container and heated in a microwave oven, the contents of the body member (200) are in direct contact with the contents, so that the temperature does not exceed 100 ° C., Since the portion of the bottom sleeve (250) is not in direct contact with the contents, depending on the characteristics of the microwave oven, the bottom sleeve (250) is heated to 100 ° C. or higher and “burned” (400) as shown in FIG. Occasionally, a phenomenon occurs.

  This is considered to be because cellulose contained in the paper is heated by the microwave of the microwave oven to generate heat. In many cases, there is a portion called a hot spot in which microwaves concentrate at a height of about 5 mm from the floor surface in the microwave oven, and this height corresponds to the height of the bottom sleeve (250). In addition, since the bottom sleeve portion folds the paper several times, the amount of paper is larger than the other portions, and the amount of heat generation is also increased.

  This “burning” phenomenon is related to the characteristics of the microwave oven and the location of the microwave oven, and does not always occur. It was also the reason why it could not be used.

  The microwave oven paper container described in Patent Document 1 and the microwave-compatible paper cup described in Patent Document 2 are both paper containers made to solve this problem. This is intended to prevent the microwave from being concentrated on the bottom sleeve portion and reduce the occurrence of scorching.

  Both the microwave oven paper cups described in Patent Documents 1 and 2 perform molding in which the bottom member is three-dimensionally squeezed. However, since the material is paper, the three-dimensional formability is inferior, and the bottom member is made into a bottom member. There is a problem that it is easy to enter.

  If wrinkles occur in the bottom member, a seal failure is likely to occur, often causing water leakage.

Japanese Patent No. 4480246 Japanese Patent No. 4770047

  The problem to be solved by the present invention is to propose a cup-shaped paper container that is less likely to be burned even when directly heated in a microwave oven, regardless of the shape of the bottom member.

As a means for solving the above-mentioned problems, the invention according to claim 1 is characterized in that a fan-shaped blank trunk seal comprising a laminate having a paper layer and a thermoplastic resin layer provided on both sides of the paper layer. A truncated cone-shaped body member having a widened upper part and a bottom member formed by molding a laminate made of a thermoplastic resin layer not including a paper layer into a circular shape A cup-type paper container, wherein a lower part of the body member is wound around a peripheral edge portion of the bottom member bent into two and heat-sealed.

  Since the cup-type paper container according to the present invention uses a laminated body made of a thermoplastic resin layer without using paper as a bottom member, the amount of paper in the bottom sleeve portion is less than that of a conventional cup-type container. It is difficult to burn when heated in a microwave oven.

  Moreover, since the moldability of the bottom member is superior to that of paper, the bottom member is less likely to wrinkle and water leakage due to wrinkles is less likely to occur.

  In the invention according to claim 2, the laminate constituting the bottom member comprises a polyethylene terephthalate (hereinafter abbreviated as PET) resin layer and a polyethylene resin layer or a polypropylene resin layer provided on both sides of the PET resin layer. The cup-type paper container according to claim 1, wherein the cup-type paper container is provided.

  The invention according to claim 3 is the cup-type paper container according to claim 1 or 2, wherein the lower portion of the body member is double-folded so that the end portion is not exposed.

  The invention according to claim 4 is characterized in that the central portion of the bottom member is recessed downward to form a recess, and the diameter of the recess is 0.8 times or more the bottom inner diameter. 4. The cup-type paper container according to any one of 3 above.

  The invention according to claim 5 is the cup type paper container according to claim 4, wherein the height of the recess of the bottom member is 0.6 times or more the height of the bottom.

  Since the cup-type paper container according to the present invention uses a laminated body made of a thermoplastic resin layer without using paper as a bottom member, the amount of paper in the bottom sleeve portion is less than that of a conventional cup-type container. That's it. For this reason, when heated in a microwave oven, scorching is unlikely to occur.

  Moreover, since the moldability of the bottom member is superior to that of paper, the bottom member is less likely to wrinkle and water leakage due to wrinkles is less likely to occur.

  In addition, since the body portion includes a paper layer, the body portion is heat-insulating. For this reason, there is an advantage that a hand is not hot in handling during heating as compared with a metal can or a glass bottle.

  As in the invention described in claim 2, the laminate constituting the bottom member has a PET resin layer having a high melting point and a polyethylene resin layer or a polypropylene resin layer provided on both sides of the PET resin layer. In this case, the heat resistance of the bottom when heated in a microwave oven is sufficiently ensured, and the sealing performance of the bottom is good.

  Moreover, when the lower part of the trunk member is folded twice so that the end portion is not exposed as in the invention described in claim 3, it is possible to prevent penetration of moisture and the like from the outside into the trunk member. Therefore, suitability for retort sterilization can be obtained.

  Further, as in the invention according to claim 4, when the concave portion is formed by denting the central portion of the bottom member downward, and the diameter of the concave portion is 0.8 times or more the inner diameter of the bottom portion, The effect of blocking microwaves when heated increases, and the effect of preventing the occurrence of scorch is further enhanced.

  Further, when the height of the concave portion of the bottom member is set to 0.6 times or more the height of the bottom portion as in the invention described in claim 5, the microwave blocking effect is similarly increased, and the occurrence of scorching The effect of preventing is increased.

FIG. 1 is a perspective view showing an embodiment of a cup-type paper container according to the present invention. FIG. 2 is a schematic cross-sectional view showing a state in which the cup-type paper container shown in FIG. FIG. 3 is a schematic cross-sectional view showing another embodiment of the cup-type paper container according to the present invention. FIG. 4 is a schematic cross-sectional view showing another embodiment of the cup-type paper container according to the present invention. FIG. 5A is a perspective explanatory view showing the structure of a conventional cup-shaped paper container. FIG. 5B is a schematic partial cross-sectional view of the paper container shown in FIG. FIG. 5C is a perspective view showing a state in which “burn” has occurred in the bottom sleeve portion.

The paper container according to the present invention will be described in detail with reference to the drawings.
FIG. 1 is a perspective view showing an embodiment of a cup-type paper container according to the present invention. FIG. 2 is a schematic cross-sectional view showing a state in which the cup-shaped paper container shown in FIG.
This will be described below with reference to these drawings.

  The cup-shaped paper container (1) according to the present invention seals the body seal portion (7) of a fan-shaped blank made of a laminate having a paper layer and a thermoplastic resin layer provided on both sides of the paper layer. A truncated cone-shaped body member (5) having an expanded upper part, and a bottom member (6) formed by molding a laminate made of a thermoplastic resin layer not including a paper layer, It is a cup-type paper container characterized in that the lower part of the body member (5) is wound around the periphery of the bottom member (6) bent downward and heat sealed.

  Since the cup-type paper container (1) according to the present invention does not use paper for the bottom member, the absolute amount of paper in the bottom sleeve portion is small. For this reason, the occurrence of scorching due to heat generation of paper when heated in a microwave oven is suppressed.

Moreover, since the cup-shaped paper container which concerns on this invention used the laminated body which consists of a thermoplastic resin layer as a bottom member (6), a moldability is favorable compared with paper. As a result, even when the periphery of the bottom member (6) is bent downward and formed into a reverse tray shape, the generation of wrinkles can be reduced, and the bottom sleeve portion has good squeeze formability and water leakage also occurs. Hard to do.

  The cup-shaped container (1) according to the present invention has a heat insulating property because the body (3) includes a paper layer. Therefore, the hands are not hot in handling during heating compared to metal cans and glass bottles. There are advantages such as. There is also an advantage that the contents are difficult to cool.

  As a material used as the bottom member (6) of the cup-shaped paper container (1) according to the present invention, a laminate in which a plurality of thermoplastic resin layers are bonded together is used. As the thermoplastic resin layer, a material having high heat resistance is preferable, and a laminate having a PET resin layer and a polyethylene (PE) resin layer or a polypropylene (PP) resin layer provided on both sides of the PET resin layer is most preferable. It can be preferably used.

  As a structure of the laminated body used for the bottom member, in addition to the above, a combination of PE / PP / PE, PP / polyamide resin / PP, PE / polyamide resin / PE, and the like may be used. Further, a combination using polybutylene terephthalate (PBT) as a sealant or a combination using polystyrene (PS) as an intermediate layer may be used.

  These thermoplastic resin layers can be bonded to each other by a dry laminating method using an adhesive. Moreover, PE of front and back can also be bonded together by the extrusion lamination method.

  The opening of the cup-shaped paper container (1) is usually curled and then crushed to form a flange (2). An arbitrary lid material can be heat-sealed to the flange portion (2) to form a sealed container. It may be used as a simple paper cup by holding the opening in a curled state without using the flange.

  FIG. 3 is a schematic cross-sectional view showing another embodiment of the cup-type paper container (1) according to the present invention. In the embodiment shown in FIG. 3, the lower part of the body member (5) is folded twice to form the squeeze part (9) so that the end of the laminate forming the body member is not exposed. It is characterized by that.

  By doing in this way, since the edge part of a laminated body can be prevented from being exposed to the outer side of a container, the penetration | invasion of the water | moisture content etc. from the exterior to a trunk | drum member can be prevented. For this reason, the suitability for retort sterilization can be obtained.

  In addition, in the case of such a use, the trunk | drum seal | sticker part (7) of a trunk | drum (3) is not just piled up and sealed the front and back of a laminated body, but is wound up and the edge part of a laminated body is exposed. It is necessary to adopt a sealing method that does not.

  FIG. 4 is a schematic cross-sectional view showing another embodiment of the cup-type paper container (1) according to the present invention. In the embodiment shown in FIG. 4, the bottom member (6) has a concave portion with the central portion recessed downward, and the diameter (d) of the concave portion is 0.8 times or more the bottom inner diameter (D). It is characterized by that.

  By forming the recess in the bottom member (6), it is possible to block the concentration of microwaves on the bottom sleeve that occurs when heated in a microwave oven. The effect of blocking the microwave can be expected as the position of the recess approaches the outer periphery of the bottom as much as possible.

  The effect can be expected if the diameter (d) of the recess is 0.8 times or more the bottom inner diameter (D). In addition, the cross-sectional shape of the recess may be a shape that gently falls in an arc shape from the outer periphery, or a shape that linearly descends toward a flat bottom surface.

  It is ideal that the descending angle of the recess is equal to the angle of the body (3) and descends so that the bottom surface is in contact with the inner peripheral surface of the bottom sleeve.

  The height (h) of the recess is preferably 0.6 times or more the height (H) of the bottom (4). Ideally, the height (h) of the recess is equal to the height (H) of the bottom, and the bottom surface is in contact with the table surface.

  As a method of forming the recess in the bottom member (6), the periphery of the bottom member may be bent downward and formed into a reverse tray shape at the same time, or after forming into a cup shape, It may be formed.

  As a molding method, a large number of laminates having a wide width can be molded at once by a vacuum molding method or a vacuum / pressure forming method, and then cut individually, or a laminate punched into a circle May be formed by male and female molds.

  As a laminated body used for the trunk | drum (3) of the cup-shaped paper container (1) which concerns on this invention, in addition to what provided the thermoplastic resin layer in the front and back of a paper layer, the thermoplasticity of the paper layer and the inner surface side of a container What provided the gas barrier layer between the resin layers can also be used. The presence of the gas barrier layer improves the storage stability after the container is filled with the contents. By appropriately selecting the material of the gas barrier layer, a product that can be stored at room temperature for a long time can be obtained.

The paper layer, other conventional cup base paper, white cardboard, coated cardboard, the basis weight of 160g ^{/ m 2} ~400g ^/ m 2 about paper ivory paper, etc. can be used.

  As the thermoplastic resin layer used for the body member, polyolefin resin is generally used. Specifically, low density polyethylene, medium density polyethylene, linear low density polyethylene, ethylene / vinyl acetate copolymer, ethylene・ Ethylene resins such as α-olefin copolymer, ethylene-methacrylic acid resin copolymer, blend resin of polyethylene and polybutene, homopolypropylene, propylene / ethylene random copolymer, propylene / ethylene block copolymer, Polypropylene resins such as propylene / α-olefin copolymers are used.

  As a material for the gas barrier layer, it is preferable to use a material other than the metal foil, such as a gas barrier plastic film or an inorganic oxide vapor deposition film, on the premise of heating by a microwave oven.

  Examples of the gas barrier film include a polyvinylidene chloride film, a polyvinyl alcohol film, an ethylene vinyl alcohol copolymer film, a gas barrier nylon film, a gas barrier polyethylene terephthalate film and the like, a PET film and the like such as aluminum oxide and silicon oxide. An inorganic oxide vapor-deposited film on which an inorganic oxide is deposited, or a polyvinylidene chloride coating, a film containing a water-soluble resin and an inorganic layered compound, or a film obtained by reacting a metal alkoxide or its hydrolyzate with an isocyanate compound. A gas barrier coating layer such as a resin layer can be used.

  Hereinafter, although the paper container concerning the present invention is explained based on an example, the paper container concerning the present invention is not limited to these.

After printing a pattern on the surface of a cup base paper having a basis weight of 260 g / m ² , a laminate of (polyethylene 12 μm / silica vapor-deposited PET 12 μm / low-density polyethylene 60 μm) was adhered to the back surface, and then the thickness was measured using an extruder. A 20 μm medium density polyethylene (MDPE) layer was formed. This was punched out using a punching die to create a fan-shaped blank.

  As a laminate for the bottom member, a laminate of PET / PS / PET having a thickness of 330 μm is laminated with PE having a thickness of 40 μm on the front side and PE having a thickness of 60 μm on the back side using an extruder. A laminate was prepared.

  This laminate was punched out to a diameter of 64 mm to prepare a bottom blank.

  The obtained blank was molded by a cup molding machine to produce a cup-shaped paper container having a shape as seen in FIGS.

  The paper container was placed on a normal cup filling line, the liquid was stored, and the lid was heat sealed.

  When the lid of the package was partially opened and heated by a microwave oven, the container did not rupture and did not burn.

  In Example 1, a concave portion having a depth of 5.0 mm as shown in FIG. 4 was formed on the bottom blank using a heated male-female mold, and then a cup-type paper container was prepared in the same manner as in Example 1.

  Although it heated with the microwave oven like Example 1, a container did not rupture or a scorch generate | occur | produced.

DESCRIPTION OF SYMBOLS 1 ... Cup type paper container 2 ... Flange part 3 ... Body part 4 ... Bottom part 5 ... Body member 6 ... Bottom member 7 ... Body part seal part 8 ... Bottom seal Portion 9 ... Pumping portion d ... Bottom member recess inner diameter D ... Bottom member inner diameter h ... Bottom member recess height H ... Bottom height 200 ... Body member 230 ... Flange portion 250 ... Bottom sleeve 300 ... Bottom member 310 ... Peripheral part 400 ... Burning

Claims (5)

A frustoconical trunk member with an expanded upper part, which is formed by sealing a fan-shaped blank trunk seal part made of a laminate having a paper layer and a thermoplastic resin layer provided on both sides of the paper layer;
A bottom member formed by molding a laminate made of a thermoplastic resin layer that does not include a paper layer into a circle;
A cup-shaped paper container, wherein a lower part of the body member is wound around a peripheral edge of the bottom member bent downward and heat sealed.   2. The cup-shaped paper container according to claim 1, wherein the laminate constituting the bottom member has a polyethylene terephthalate resin layer and a polyethylene resin layer or a polypropylene resin layer provided on both surfaces of the polyethylene terephthalate resin layer. .   The cup-shaped paper container according to claim 1 or 2, wherein the lower portion of the body member is folded in double so that the end portion is not exposed.   The said bottom member forms a recessed part with a center part dented below, The diameter of this recessed part is 0.8 times or more of a bottom part internal diameter, The any one of Claims 1-3 characterized by the above-mentioned. Cup type paper container.   The cup-shaped paper container according to claim 4, wherein the height of the concave portion of the bottom member is not less than 0.6 times the height of the bottom portion.

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