JP5772218B2 - Cup type paper container - Google Patents

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. 9 (a) and 9 (b), the bottom member (200) and the bottom member (300) are formed into a reverse tray shape. The bottom sleeve (250) is generally formed by winding the lower end portion of the body member (200) around the peripheral edge portion (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 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 “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 cup described in Patent Document 1 has been made to solve this problem, and in order to prevent the bottom sleeve from being formed, as shown in FIG. The bottom sleeve is not formed by forming (300) into a flat shape without forming a reverse tray, and folding the body member (200) into the bottom member (300) and only crushing it by 90 °. It is what I did.

  Similarly, the heat-insulated microwave oven-compatible paper cup described in Patent Document 2 has a bottom plate formed into a dish shape so that the bottom sleeve is not formed.

Japanese Patent No.3953584 Japanese Patent Laid-Open No. 2002-211534

The microwave oven paper cups described in Patent Documents 1 and 2 do not have the bottom sleeve as in a normal paper cup, so the bottom sleeve does not burn, but the bottom is not a perfect plane, so the product is used as a hot plate. When placing and heating and selling,
The heat conductivity was poor and it was not sufficient in hot plate heating suitability.

  The problem to be solved by the present invention is to propose a cup-type paper container that has good heat aptitude with a hot plate and does not cause burning even when heated directly in a microwave oven.

As a means for solving the above-mentioned problems, the invention according to claim 1 is a cylindrical shape formed from a blank for forming a body having a paper layer and a thermoplastic resin layer provided on both sides of the paper layer. The torso of;
A lid that seals the opening above the barrel;
A circular bottom surface having a paper layer and a thermoplastic resin layer provided on both sides of the paper layer and sealing an opening below the body;
A cup-shaped paper container comprising:
The body portion is formed by rolling the upper end portion of the body portion one or more times outside and then flatly crushing the body portion bonding portion in which both side edges of the body portion forming blank are overlapped and sealed. A flange portion formed, and a bottom flange portion formed by rolling the lower end portion of the body portion inwardly once and a half and then flatly crushing,
In the body bonding portion, at least the side edge of the paper layer that is the inside of the container is covered with the thermoplastic resin layer provided on both sides of the paper layer,
In the flange portion, the lid material is sealed so that it can be opened,
The cup-shaped paper container is characterized in that a peripheral edge portion of the bottom surface portion is tightly sealed to a lower surface of the bottom flange portion.

  The invention according to claim 2 is the cup-shaped paper container according to claim 1, wherein the bottom surface portion includes a metal foil layer.

  The cup-type paper container according to the present invention has a bottom structure in which the bottom surface portion is tightly sealed to a bottom flange portion formed by winding the lower end portion of the body portion inward one and a half times and then flatly crushing. Therefore, the bottom surface is flat and there is no bottom sleeve. For this reason, when it heats with a microwave oven, there is no burning.

  In addition, since the cup-type paper container according to the present invention has a flat bottom surface, it is excellent in heat aptitude when placed on a hot plate and heated.

  In addition, all the end faces of the paper layer that comes into contact with the contents are covered with a thermoplastic resin layer or are encased, and the end face of the paper layer is not exposed inside the container, so the contents are filled. When the package after being cooked with a microwave oven, the contents do not penetrate into the paper layer and can be cooked hygienically.

  In addition, since the body portion and the bottom portion include a paper layer, there is an insulating property, and therefore, there is an advantage that a hand is not hot in handling during heating as compared with a metal can or a glass bottle.

  According to invention of Claim 2, since a bottom face part contains a metal foil layer, the heating method using a high frequency is employable at the time of manufacture of a paper container. Moreover, since the bottom surface generates heat when the package is heated in a microwave oven, uniform heating is possible.

FIG. 1 is a perspective view showing an embodiment of a cup-type paper container according to the present invention. FIG. 2A is a schematic cross-sectional view showing the A-A ′ cross section of FIG. 1. 2B is a partially enlarged schematic cross-sectional view of the body portion in FIG. 2A, and FIG. 2C is a partially enlarged cross-sectional view of the bottom surface portion. FIG. 3A is a schematic cross-sectional view showing the B-B ′ cross section of FIG. 1. FIG. 3B is a partially enlarged schematic cross-sectional view of the body portion bonding portion in FIG. FIG. 4 is a schematic plan view showing the trunk forming blank and the bottom forming blank of the cup-type paper container shown in FIG. 5 (a), 5 (b), and 5 (c) are explanatory views showing a process of forming the bottom surface of the cup-type paper container shown in FIG. 6 (a), 6 (b), and 6 (c) are explanatory views showing an example of a method for creating a trunk forming blank of a cup-type paper container according to the present invention. FIG. 7 is a schematic cross-sectional view of the bottom surface portion of the cup-type paper container according to claim 2 of the present invention. FIG. 8 is a schematic cross-sectional view showing another example of the layer structure of the laminate used in the cup-type paper container according to the present invention. FIG. 9A is a perspective explanatory view showing the structure of a conventional cup-shaped paper container. FIG. 9B is a schematic partial cross-sectional view of the paper container shown in FIG. FIG. 9C is a perspective view showing a state in which “burn” has occurred in the bottom sleeve portion. FIG. 9 (d) is a schematic partial sectional view of another conventional paper container.

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 (1) according to the present invention. Moreover, Fig.2 (a) is a cross-sectional schematic diagram which showed the AA 'cross section of the paper container (1) shown in FIG.
2B is a partially enlarged schematic cross-sectional view of the body portion 20 and FIG. 2C is a partially enlarged cross-sectional view of the bottom surface portion 30. FIG. 3A is a schematic cross-sectional view showing the BB ′ cross section of FIG. FIG.3 (b) is a partial expanded cross-section schematic diagram of the trunk | drum bonding part (21c) in Fig.3 (a). 4 is a schematic plan view showing the trunk forming blank (20b) and the bottom forming blank (30b) of the cup-type paper container shown in FIG. 5A, 5B, and 5C are explanatory views showing a process of forming the bottom surface of the cup-type paper container shown in FIG. This will be described below with reference to these drawings.

  A cup-shaped paper container (1) according to the present invention has a body layer forming blank (20b) having a paper layer (2) and thermoplastic resin layers (3a, 3b) provided on both sides of the paper layer (2). A cylindrical body part (20) formed from: a lid member (10) for sealing an opening above the body part (20); a paper layer (2), and provided on both sides of the paper layer (2) A cup-type paper container having a thermoplastic resin layer (3a, 3b) and a bottom surface portion (30) for sealing an opening below the body portion (20).

  In the cup-shaped paper container (1) according to the present invention, at least the side edge (21e) of the paper layer on the inside of the container of the trunk forming blank (20b) is as shown in FIG. It is covered with thermoplastic resin layers (3a, 3b) provided on both sides of the paper layer (2).

The body part (20) includes a body part bonding part (21c) in which both side edges (21a, 21b) of the body part forming blank (20b) are overlapped and sealed, and a lower end part of the body part (20). The bottom flange portion (22f) formed by rolling (22) inward once and a half or more and then flattened flatly, and the upper end portion (23) of the body portion (20) are wound outward once or more and then flattened. And a flange portion (23f) formed by crushing.

  The flange portion (23f) and the lid member (10) are sealed so that they can be opened. The bottom surface portion (30) is tightly sealed to the bottom flange portion (22f) formed at the peripheral edge portion (31) by winding the lower end portion of the body portion (20) inward once and a half or more and then flattening it. ing.

5 (a), 5 (b), and 5 (c) are explanatory views showing a process of forming the bottom surface of the cup-type paper container (1) according to the present invention shown in FIG.
First, as shown to Fig.5 (a), the lower end part (22) of a trunk | drum (20) is wound inside one and a half times or more.

  Next, as shown in FIG.5 (b), it arrange | positions to the trunk | drum lower end part which wound the peripheral part (31) of the bottom face part (30), and as shown in FIG.5 (c), a bottom flange part ( At the same time as molding 22f), the bottom surface (30) is tightly sealed together.

  At this time, after the bottom flange portion (22f) is formed in advance, the bottom surface portion (30) may be tightly sealed. As shown in FIG. 5, the bottom flange portion (22f) and the bottom surface portion ( 30) may be performed at once.

  The cup-type paper container (1) according to the present invention has a flat bottom surface and does not have a bottom sleeve like a normal paper cup. For this reason, when it heats with a microwave oven, there is no burning. Moreover, the heat aptitude with a hot plate is also good.

  Also, the end faces of all paper layers that come into contact with the contents are covered with or wrapped in a thermoplastic resin layer, and the end faces of the paper layers are not exposed inside the paper container, so the contents are filled. The sanitary property is maintained when the packaged body is heated with a microwave oven or heated with a hot plate.

  The cup-shaped container (1) according to the present invention has heat insulation because at least the body part (20) and the bottom part (30) include the paper layer (2). Therefore, compared with metal cans and glass bottles. In handling during heating, there are advantages such as the hands not being hot. There is also an advantage that the contents are difficult to cool.

Moreover, since the basic shape of the cup-shaped paper container (1) according to the present invention is the same as that of a normal paper cup, it can be manufactured using a normal paper cup manufacturing apparatus.
However, when molding the bottom surface portion (30), it is necessary to heat-seal the four laminates at a time, so heat can be insufficient only by preheating with hot air that is normally used in the molding of paper cups. In addition to this, it is desirable to use a sealing method using ultrasonic waves in addition to this.

  In the body forming blank (20b) shown in FIG. 4, the corner portions are doubled by bonding the side edges to each other, and are folded back or rolled up to overlap each other. In order to avoid this, it is preferable to provide a notch in each corner in advance.

6 (a), 6 (b), and 6 (c) are explanatory views showing an example of a method for producing the body forming blank (20b) of the cup-type paper container (1) according to the present invention.
First, as shown in FIG. 6 (a), after punching the long window (6) while aligning with the web (2w) of the printed base paper, the thermoplastic resin layers (3a, 3b) are formed on the entire front and back surfaces. Provide. The portion of the long window (6) is in a state where the thermoplastic resin layers (3a, 3b) on the front and back surfaces are bonded to each other. FIG. 6 is a view of the web as seen from the back side opposite to the printing surface.

Next, the body forming blank (20b) is punched, and at this time, as shown in FIG. 6 (b), punching is performed so that the protruding portion (3c) of the thermoplastic resin layer remains on the side edge of the blank. .
Next, as shown in FIG. 6 (c), the protruding portion (3c) of the thermoplastic resin layer is folded back and thermocompression bonded to form a folded thermoplastic resin layer (3h). The paper layer side edge (21e) at the side edge of the blank (20b) is covered.

  There are several other methods for covering the paper layer side edge (21e) of the side edge (21b) of the body forming blank (20b) with the thermoplastic resin layers (3a) and (3b). There are no particular restrictions.

FIG. 7 is a schematic cross-sectional view of the bottom surface portion (30) of the cup-type paper container (1) according to claim 2 of the present invention. In this embodiment, the bottom surface portion (30) includes a metal foil layer (5). The most common metal foil is an aluminum foil. As shown in FIG. 7 , the position of the metal foil layer (5) may be between the paper layer (2) and the thermoplastic resin layer (3b) inside the container, or the paper layer (2) and the outside of the container. It may be between the thermoplastic resin layer (3a).

  When the bottom surface portion (30) includes the metal foil layer (5), when forming the bottom surface portion, in addition to the conventional preheating with hot air, a heating method using high frequency can be used in combination. Due to the presence of the metal foil in the layer of the laminate, heat is generated from the inside of the laminate when a high frequency is applied, so that the whole is uniformly heated, the occurrence of defective sealing is suppressed, and a stable product is obtained. .

  FIG. 8 is a schematic cross-sectional view showing another example of the layer structure of the laminate used in the cup-shaped paper container (1) according to the present invention. As a laminate used for the cup-shaped paper container (1) according to the present invention, in addition to the thermoplastic resin layers (3a) and (3b) provided on the front and back surfaces of the paper layer (2), the paper layer (2) A gas barrier layer (4) may be provided between the inner surface side of the container and the thermoplastic resin layer (3b). The presence of the gas barrier layer (4) improves the storage stability after the container is filled with the contents. By appropriately selecting the material of the gas barrier layer (4), a product that can be stored at room temperature for a long time can be obtained.

  As a material of the gas barrier layer (4), it is preferable to use a material other than the metal foil, such as a gas barrier plastic film and an inorganic oxide vapor deposition film, on the premise of heating by a microwave oven.

The material used for the paper container according to the present invention will be described. The paper layer (2), 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 layers (3a, 3b), polyolefin resins are generally used. Specifically, low density polyethylene, medium density polyethylene, linear low density polyethylene, ethylene / vinyl acetate copolymer, Ethylene resins such as ethylene / α-olefin copolymers and ethylene-methacrylic acid resin copolymers, blend resins of polyethylene and polybutene, homopolypropylene, propylene / ethylene random copolymers, propylene / ethylene block copolymers Polypropylene resins such as propylene / α-olefin copolymers are used.

  As a material used for the lid member (10), a laminated material obtained by combining paper and several kinds of thermoplastic resin films is used. As a combination of thermoplastic resin films, for example, a transparent stretched film, a gas barrier film, and a sealant film can be combined.

  Examples of the transparent stretched film include film materials such as a polyester resin film such as polyethylene terephthalate (PET), a uniaxially stretched polypropylene resin film, a biaxially stretched polypropylene (OPP) resin film, and a biaxially stretched polyamide resin film. From the viewpoints of heat resistance, substrate strength, etc., a PET resin film can be preferably used.

  Examples of gas barrier films include polyvinylidene chloride films, polyvinyl alcohol films, ethylene vinyl alcohol copolymer films, gas barrier nylon films, gas barrier polyethylene terephthalate films, etc., PET films, etc., aluminum oxide, silicon oxide, etc. 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.

  The sealant film may be a single layer or multiple layers, but the innermost surface of the sealant layer is a low density polyethylene resin, a linear low density polyethylene resin, an ethylene-vinyl acetate copolymer resin, an ethylene-methacrylic acid copolymer resin. An easy peel sealant resin layer mainly composed of an acid copolymer resin such as an ethylene-acrylic acid copolymer resin is preferred. In any case, the material of these sealant layers is selected according to the material on the bonding surface side of at least the opening peripheral portion of the adherend container.

  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 low-density polyethylene (LDPE) layer having a thickness of 30 μm was formed on the front and back surfaces using an extruder. This was punched out with a die to create a trunk forming blank and a bottom forming blank as shown in FIG.

  The bottom of the blank thus obtained was molded with a modified cup molding machine as shown in FIG. 5, and a paper container body having a shape as shown in FIGS. 1 and 2 was produced. At the time of molding, since hot air and an ultrasonic sealing machine were used in combination, there was no sealing failure and the sealing condition was good.

  The lid material was composed of LDPE, 30 μm / PET, 12 μm / stretched nylon, 25 μm / LDPE, 30 μm. This was punched into a circle and prepared as a lid.

  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.

The structure of the laminated body was, in order from the inside, LDPE, 30 μm / 260 g cup base paper / silica vapor deposited PET, 12 μm / LDPE, 30 μm. A blank was prepared using this laminate, and a paper container having the structure shown in FIGS. The lid material is LDPE, 30μ.
m / silica vapor-deposited PET, 12 μm / stretched nylon, 25 μm / LDPE, 30 μm were used. The rest is the same as in the first embodiment.

  The container was aseptically filled with potage soup. The obtained package could be stored at room temperature, and when used, a part of the lid material was peeled off to open a vapor vent, and then it could be directly heated in a microwave oven. The container did not rupture or burnt.

  A cup-type paper container was prepared using the same material as in Example 2 except that the material used for the bottom part was made of LDPE, 30 μm / 260 g cup base paper / aluminum foil, 12 μm / LDPE, 30 μm in order from the inside. Produced. At the time of molding the bottom surface portion, in addition to preheating with hot air, heating using high frequency was used in combination, so the molded state of the bottom surface portion had no seal unevenness and the seal state was good.

  Other than that was carried out similarly to Example 2, and created the package. The obtained package could be stored at room temperature. As for heating during use, direct heating by a microwave oven was possible.

DESCRIPTION OF SYMBOLS 1 ... Cup type paper container 2 ... Paper layer 2w ... Base paper web 3a, 3b ... Thermoplastic resin layer 3c ... Extrusion part 3h of thermoplastic resin layer ... Folded thermoplastic resin Layer 4 ... Gas barrier layer 5 ... Metal foil layer 6 ... Long window 10 ... Lid 20 ... Body part 20b ... Body part forming blanks 21a, 21b ... Side edges Edge 21c ... body portion bonding portion 21e ... paper layer side edge 22 ... lower end portion 22f ... bottom flange portion 23 ... upper end portion 23f ... flange portion 30 ... bottom surface portion 30b ... Blank for forming the bottom portion 31 ... Peripheral portion 200 ... Body member 230 ... Flange portion 250 ... Bottom sleeve 260 ... Leg portion 300 ... Bottom member 310 ... Perimeter Part 400 ... burnt

Claims (2)

A cylindrical body formed from a paper layer and a body forming blank having a thermoplastic resin layer provided on both sides of the paper layer;
A lid that seals the opening above the barrel;
A circular bottom surface having a paper layer and a thermoplastic resin layer provided on both sides of the paper layer and sealing an opening below the body;
A cup-shaped paper container comprising:
The body portion is formed by rolling the upper end portion of the body portion one or more times outside and then flatly crushing the body portion bonding portion in which both side edges of the body portion forming blank are overlapped and sealed. A flange portion formed, and a bottom flange portion formed by rolling the lower end portion of the body portion inwardly once and a half and then flatly crushing,
In the body bonding portion, at least the side edge of the paper layer that is the inside of the container is covered with the thermoplastic resin layer provided on both sides of the paper layer,
In the flange portion, the lid material is sealed so that it can be opened,
A cup-type paper container, wherein the bottom surface of the bottom flange is tightly sealed with the peripheral edge of the bottom.   The cup-type paper container according to claim 1, wherein the bottom portion includes a metal foil layer.

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