JP6047912B2 - Microwave oven paper cup and paper container using the same - Google Patents

Description

  The present invention relates to a microwave oven paper cup used in a microwave oven and a paper container using the same.

  Conventionally, paper cups have been widely used as containers for storing contents such as instant foods, beverages, and side dishes. In particular, paper cups used for microwave heating are not yet common, but are used, for example, for popcorn cooking and for heating contents such as instant foods, beverages, and prepared dishes.

  As shown in FIGS. 13 and 14, a general paper cup is composed of a barrel member 1 and a bottom member 5, and the barrel member 1 mainly forms a barrel portion 2 and curls the upper end outward to form a top curl. The folded portion 4 is formed by folding the lower end inward. The bottom member 5 mainly forms a bottom surface portion 6, and the outer peripheral edge portion is bent downward at a substantially right angle to form a bent portion 7. The body member 1 and the bottom member 5 are joined by heating and bonding the bent portion 7 between the folded portion 4 of the body member and the lower end surface 3 of the body portion. The joined portion 8 joined by sandwiching the bent portion 7 is referred to as a yarn bottom portion 10 and is formed with the bottom surface portion 6 as a raised bottom.

  However, when the contents are stored in a paper cup and heated in a microwave oven, there is a problem that the yarn bottom portion of the paper cup is burnt. The cause is considered as follows.

  Paper pulp cellulose absorbs microwaves from the microwave and generates heat. Therefore, the total thickness of the yarn bottom where the paper overlaps increases, and the amount of heat generated increases. Further, the yarn bottom part is irradiated with microwaves from inside and outside the bottom part, and the amount of heat generation becomes large. On the other hand, since the surface area of the yarn bottom portion does not change, the amount of heat released is the same, and the generated heat is accumulated, causing the temperature to rise and causing scorching. Further, the yarn bottom portion is not in contact with the contents, and a sufficient heat radiation amount cannot be obtained with respect to the heat generation amount.

  In order to improve these, there are the following proposals. The distance between the lower surface portion of the bottom surface portion of a general paper cup and the lower end surface formed by the lower end of the body portion is characterized by a range of less than 8 mm upward from the lower end surface and less than 2 mm downward from the lower end surface. (Patent Document 1).

  In this proposal, the bottom surface of the bottom surface is recessed downward to reduce the microwave irradiation to the yarn bottom as much as possible. However, charring may occur. This is because the total thickness of the paper at the yarn bottom does not change, and heat may be generated to cause scorching. Therefore, there is a problem even if the microwave irradiation of the microwave oven is reduced.

  In addition, there is a proposal that a paper cup provided with a protective cover on the outer periphery of the paper cup body, a metal tape is stuck on the protective cover, and the yarn tail is shielded from microwaves (Patent Document 2).

  Although it is possible to shield the microwaves with a metal tape, for example, when the metal tape is stuck, there is a risk of sparking in the microwave oven, which is problematic.

  In addition, the bottom surface of the bottom surface of the cup is recessed downward, and the outer surface of the body member and the bottom member is laminated with low-density polyethylene to foam the low-density polyethylene, thereby preventing the yarn bottom portion from being burnt. There is a proposal (Patent Document 3).

  However, since the total thickness of the paper at the yarn bottom does not change, there is a problem that heat is generated and scorching occurs.

  There is a need for a microwave oven paper cup and a paper container using the same, in which even when a paper cup containing contents is heated in a microwave oven, the burnt end portion is hardly burnt.

Japanese Patent No. 4770047 JP 2001-145563 A Japanese Patent Laid-Open No. 2002-80071

  In view of the problems in the background art, even when a paper cup containing food such as instant foods, beverages, and prepared foods is heated in a microwave oven, it is unlikely that scorching will occur at the yarn bottom, and a paper container using the same Is to provide.

  In order to solve the above problems, the inventors have intensively studied and completed the present invention.

The invention according to claim 1 of the present invention is a microwave oven paper cup comprising a body member and a bottom member,
The body member has a body part, and a top curl part that curls the upper end part of the body part outward,
The bottom member includes a bottom surface portion and a bent portion obtained by bending the outer peripheral edge portion of the bottom surface portion downward at a substantially right angle;
The lower end portion of the body portion is folded inward, and a joined portion is formed that is joined in a state of sandwiching the bent portion,
At least one cut line or notch is formed in the joint ,
The shape of the switching chipped portion is a microwave oven paper cups, characterized in semicircular or circular der Rukoto.

  The invention according to claim 2 of the present invention is the microwave oven paper cup according to claim 1, wherein the cut line has a linear shape.

The invention according to claim 3 of the present invention is a paper container characterized by using the microwave oven paper cup according to claim 1 or 2 .

  The microwave oven paper cup of the present invention is a paper cup that hardly burns at the joint even if it contains contents such as instant foods, beverages, and side dishes and is heated in the microwave oven. In particular, by providing at least one notch line or notch in the joint, heat can be easily released from the end surface of the notch line or notch. That is, the occurrence of scorching is suppressed by increasing the release of heat from the end face of the joint.

According to claim 1 of the present invention, at least one or more cut lines or notches are formed in the joint, so that it is possible to provide a paper cup in which the joint is less likely to be burned. Since at least one or more cut lines or notches are formed in the joint (hereinafter referred to as the thread tail), heat can be released from the end faces of the cut lines or notches.
According to claim 1 of the present invention, since the shape of the notch is semicircular or circular, it is possible to further increase the heat release. In addition, the standing property of the yarn bottom can be maintained and a stable leg can be formed.

  According to the second aspect of the present invention, since the shape of the cut line is a straight line, it is possible to increase the release of heat generated. In addition, the standing property of the yarn bottom can be maintained and a stable leg can be formed.

According to the third aspect of the present invention, the paper container using the microwave oven paper cup of the present invention can be heated in a state in which contents such as instant foods, beverages and prepared dishes are stored. Since it is difficult for scorch to occur at the yarn bottom, the contents can be heated safely. It is a microwave oven container having convenience.

It is explanatory drawing which shows an example of the microwave oven paper cup of this invention. It is a perspective view which shows an example of the microwave oven paper cup of FIG. It is explanatory drawing which shows an example of the microwave oven paper cup of this invention. It is a perspective view which shows an example of the microwave oven paper cup of FIG. It is explanatory drawing which shows an example of the microwave oven paper cup of this invention. It is a perspective view which shows an example of the microwave oven paper cup of FIG. It is explanatory drawing which shows an example of the microwave oven paper cup of this invention. It is a perspective view which shows an example of the microwave oven paper cup of FIG. It is explanatory drawing which shows an example of the paper container using the cup for microwave ovens of FIG. It is a perspective view which shows an example of the paper container of FIG. It is explanatory drawing which shows an example of a structure of a trunk | drum member and a bottom material. It is explanatory drawing which shows an example of a structure of a trunk | drum member and a bottom material. It is explanatory drawing which shows an example of the manufacturing method of the conventional paper cup. It is sectional drawing which shows an example of the conventional paper cup.

  Hereinafter, embodiments for carrying out the present invention will be described.

  FIG. 1 is an explanatory view showing an example of a microwave oven paper cup of the present invention. The body member 1 has a body part 2 and a top curl part 9 with the upper end part of the body part curled outward, and the bottom member 5 has a bottom part 6 and an outer peripheral edge part of the bottom part downward. And a bent portion 7 bent substantially at a right angle. The body member 1 and the bottom member 5 are joined by heating and bonding the bent portion 7 between the folded portion 4 of the body member and the lower end surface 3 of the body portion. That is, the lower end portion of the body portion is folded inward with the bending portion 7 interposed therebetween, and the joining portion 8, that is, the yarn bottom portion 10 is formed by heating and pressing. At the lower end of the yarn bottom portion 10, at least one vertical cutting line 20 is formed upward from the lower end of the yarn bottom portion. The vertical cut line 20 can increase the heat release from the yarn bottom and exhibit a heat dissipation effect.

  FIG. 2 is a perspective view showing an example of the microwave oven paper cup of FIG. Even if at least one vertical cutting line 20 is formed above the lower end of the yarn bottom portion, the yarn bottom portion 10 is a stable leg.

  FIG. 3 is an explanatory view showing an example of the microwave oven paper cup of the present invention. An example is shown in which at least one semicircular notch 22 is formed at the lower end of the yarn bottom 10. A cup with increased heat release from the yarn bottom.

FIG. 4 is a perspective view showing an example of the microwave oven paper cup of FIG. Even if at least one semicircular cutout 22 is formed at the lower end of the yarn bottom portion 10, the yarn bottom portion 10 is a stable leg.

  FIG. 5 is an explanatory view showing an example of the microwave oven paper cup of the present invention. An example in which at least one circular notch 23 is formed in the yarn bottom 10 is shown. A cup with increased heat release from the yarn bottom.

  FIG. 6 is a perspective view showing an example of the microwave oven paper cup of FIG. Even if at least one circular notch 23 is formed in the yarn bottom portion 10, the yarn bottom portion 10 is a stable leg.

  FIG. 7 is an explanatory view showing an example of the microwave oven paper cup of the present invention. An example in which at least one horizontal cut line 21 is formed in the yarn bottom portion 10 is shown. A cup with increased heat release from the yarn bottom.

  FIG. 8 is a perspective view illustrating an example of the microwave oven paper cup of FIG. Even if at least one or more cut lines 21 are formed in the yarn bottom portion 10 at the cut transverse shape, the yarn bottom portion is a stable leg.

  FIG. 9 is an explanatory view showing an example of a paper container using the microwave oven cup of FIG. The microwave oven paper container 60 in a state where the lid member 30 is sealed to the top curl portion 9 of the microwave oven paper cup 50 shown in FIG.

  FIG. 10 is a perspective view showing an example of the paper container of FIG. The microwave oven paper container 60 is shown sealed in a lid 30. The lid member 30 is formed with a tab 31 for facilitating peeling.

  FIG. 11 is an explanatory diagram showing an example of the configuration of the body member and the bottom member of the microwave oven cup of the present invention. A thermoplastic resin layer 41 is laminated on the inner surface or both surfaces of the paper 40. The thermoplastic resin layer 41 is laminated in order to increase the water resistance, moisture resistance, oil resistance, and paper rigidity of the paper in addition to joining the body member and the bottom member.

  FIG. 12 is an explanatory diagram showing an example of the configuration of the body member and the bottom member of the microwave oven cup of the present invention. An example of a configuration having gas barrier properties such as oxygen gas and water vapor is shown. A deposited film 42 on which an inorganic oxide is deposited is laminated between a paper 40 and a thermoplastic resin layer 41 on the inner surface. The storage period of the contents can be extended by sealing with a cover material having gas barrier properties.

  Furthermore, the form for implementing this invention is demonstrated.

As the paper 40 forming the body member, commonly used cup base paper, milk carton paper, craft paper, or the like can be used. The basis weight is not particularly limited, but a cup base paper in the range of 150 to 300 g / m ² is preferable in view of molding suitability of the body member. If it is less than 150 g / m ² , cracks and pinholes are likely to occur during molding, and if it exceeds 300 g / m ² , the rigidity of the paper increases and the moldability deteriorates.

Further, as the paper 40 forming the bottom member, commonly used cup base paper, milk carton paper, craft paper and the like can be used. The basis weight is not particularly limited, but a cup base paper in the range of 150 to 250 g / m ² is preferable from the viewpoint of forming the bottom member. If the basis weight is less than 150 g / m ² , cracks and pinholes are likely to occur, and if it exceeds 250 g / m ² , the rigidity of the paper becomes strong and it becomes difficult to form. In order to make a paper cup that is stable in strength, it is preferable that the basis weight of the cup base paper used by the trunk member is higher than the basis weight of the cup base paper used for the bottom member.

  A thermoplastic resin layer 41 is laminated on the inner surfaces of the body member and the bottom member. The thermoplastic resin layer 41 is laminated in order to develop paper water resistance, moisture resistance, oil resistance, and paper rigidity, in addition to joining the body member and the bottom member. In order to form a paper cup, the inner surface of the body portion and the inner surface of the bent portion are joined by heating and pressurizing to form a joint portion. As the thermoplastic resin layer, resins such as polyethylene, polypropylene, polyethylene terephthalate, polyamide, ethylene vinyl alcohol, and ethylene-vinyl acetate copolymer can be used. The resin is not particularly limited as long as it is a resin that is melted and joined by heat. These resins can be used for lamination by melt extrusion laminating or film laminating. The thickness of the thermoplastic resin layer is preferably in the range of 15 to 60 μm. What is necessary is just to determine suitably from the required quality of the contents. Moreover, you may laminate | stack a thermoplastic resin layer on both surfaces of a trunk | drum member and a bottom member. Water resistance, moisture resistance, oil resistance and the like can also be added to the outer surface of the paper cup.

  If there is a demand for gas barrier properties, a deposited film obtained by depositing an inorganic oxide such as aluminum oxide, silicon oxide or magnesium oxide to a thickness of about 20 to 100 nm is laminated between the paper and the thermoplastic resin layer on the inner surface. can do. A stretched polyethylene terephthalate film is used as the base material used for the vapor deposition film.

  The paper and the vapor-deposited film can be bonded together by a melt extrusion laminating method through polyethylene. The vapor deposition film and the thermoplastic resin layer can be bonded by a known method such as a dry lamination method using a two-component reaction type polyurethane resin adhesive or a melt extrusion lamination method using polyethylene. it can.

  As the laminated structure of the body member and the bottom member, for example, from the surface side, paper / polyethylene resin, polyethylene resin / paper / polyethylene resin, polyethylene resin / paper / inorganic oxide vapor deposition film / polyethylene resin, foamed polyethylene resin / paper / Polyethylene resin, paper / polypropylene resin, polypropylene resin / paper / inorganic oxide vapor deposition film / polypropylene resin, paper / polyethylene terephthalate resin, polyethylene terephthalate resin / paper / polyethylene terephthalate resin, paper / polyamide resin, polyamide resin / paper / polyamide resin Etc. For these laminated structures, the front and back resins may be appropriately selected according to the required quality derived from the contents.

  Further, if necessary, it is possible to print on the surface of paper and to express a pattern and characters. As a printing method, a known method such as gravure printing, offset printing, flexographic printing, letterpress printing, and ink jet printing can be used.

  The cup for microwave oven of the present invention can be filled with contents such as instant foods, beverages, liquor, side dishes, and sealed with a lid material to form a sealed paper container. A paper container sealed with a cover material having gas barrier properties can extend the storage period of contents. Further, even when heated in the state of a sealed paper container, it is a paper container that is unlikely to cause scorching at the yarn bottom. It is a convenient paper container.

  However, when heated in a microwave oven, it is necessary to vent the steam due to the temperature rise and internal pressure rise of the contents. Therefore, it is necessary to use a lid material that has seal strength, can peel off the steam when the internal pressure increases due to steam, can be vented, and can easily peel after heating. For this purpose, it is necessary to select a sealant layer that can be easily peeled.

  For example, the peeling type of the sealant layer is not particularly limited, but a cohesive peeling type or an interfacial peeling type can be used.

  The cohesive peeling type is a type in which the sealant layer itself cohesively breaks, and can be used as a film using a resin in which a resin such as polypropylene, polyethylene, or polystyrene is mixed. Alternatively, these mixed resins may be applied as a coating solution.

  The interfacial peeling type is a film formed using a resin in which the mixing ratio of vinyl acetate in the ethylene-vinyl acetate copolymer resin is increased.

  As the material of the sealant layer, for example, when the thermoplastic resin on the inner surface of the barrel member is a polyethylene resin, the mixed combination of the base resin / blending thermoplastic resin is a polyethylene resin / ethylene-methacrylic acid copolymer, A combination of polyethylene resin / ethylene-vinyl acetate copolymer, polyethylene resin / ethylene-acrylic acid copolymer, and polyethylene resin / ethylene-ethyl acrylate copolymer is preferable.

  When the thermoplastic resin on the inner surface of the body member is a polypropylene resin, the combination of the base resin / blend thermoplastic resin is preferably a combination of polypropylene resin / polystyrene resin or polypropylene resin / polyethylene resin.

  The sealant layer may be appropriately determined from the adhesive strength with the top curl portion and easy peel properties, that is, peel strength and peelability.

  Therefore, a paper container sealed with such a lid material is highly convenient, such as being less likely to be burnt at the yarn bottom even when heated in a microwave oven, and capable of venting steam.

  Next, the manufacturing method of the microwave oven paper cup of this invention is demonstrated.

  FIG. 13 is an explanatory view showing an example of a method for producing a microwave oven paper cup of the present invention. An example of the manufacturing method of the microwave oven paper cup shown in FIG. 1 will be described. The body member 1 is previously punched in the previous process, and the bottom member 5 is punched on a paper cup molding machine. On the paper cup molding machine, the body member 1 is formed into a cylindrical body portion 2, the upper end is curled outward to form a top curled portion 9, and the lower end is folded inward to form the folded portion 4. The bottom member 5 is formed with a bent portion 7 formed by bending the outer peripheral edge portion of the bottom member 5 downward at a substantially right angle, and the bent portion 7 is sandwiched between the folded portion 4 of the trunk member and the lower end surface 3 of the trunk portion. The yarn bottom portion 10 is formed by heat bonding. The bottom portion 6 is formed with the raised bottom. Next, at least one vertical cutting line 20 is formed in the yarn bottom part above the lower end of the yarn bottom part 10 on a paper cup molding machine or in a separate facility. In this way, it is possible to create a paper cup that is less likely to be burnt at the yarn bottom.

  The cut line formed in the yarn bottom portion may be linear or curved. There are no particular limitations on the vertical shape, horizontal shape, diagonal shape, S-shape, and the like. From the viewpoint of workability and the like, the vertical and horizontal shapes are preferred.

  The cutout portion formed in the yarn bottom portion is not particularly limited, such as a semicircular shape, a circular shape, a triangular shape, or a square shape. From the viewpoint of processability, a semicircular shape and a circular shape are preferable. Moreover, you may use a notch part and a cut line together.

  As a method of forming the cut line and the notch portion, a known method such as press working using a mold or laser processing can be used.

  Hereinafter, specific examples of the present invention will be described.

As the body member, 25 μm of polyethylene resin was laminated on the inner surface of a cup base paper having a basis weight of 250 g / m ² using an extruder. Next, as a bottom member, a polyethylene resin was laminated by 25 μm on the inner surface of a cup base paper having a basis weight of 220 g / m ² using an extruder. Next, in order to form a trunk blank, the trunk member was punched into a predetermined shape using a Thomson-type punching machine to form a trunk blank.

  Next, using a general paper cup molding machine, a body blank was wound around a mandrel to form a cylindrical body. The lower end of the body portion was folded inward to form a folded portion. The bottom member is formed with a bottom blank on the molding machine, and a bent portion is formed by bending the outer peripheral edge of the bottom blank downward at a substantially right angle, while the bent portion is a folded portion at the lower end of the body portion. It was heated and bonded to the lower end surface of the body part, and the polyethylene resin was melted and pressed to join to form a joined part, that is, a thread bottom part. Thereafter, the upper end portion of the barrel portion was curled to form a top curl portion, thereby creating a paper cup.

  At this time, a paper cup having a thread tail length of 10 mm and a content of 200 cc was prepared.

  A microwave sheet cup was prepared by forming one vertical cut line having a length of 3 mm from the lower end of the yarn bottom portion at the yarn bottom portion of the paper cup.

  A microwave oven cup was prepared in the same manner as in Example 1 except that three cut lines were formed at equal intervals in the yarn bottom.

  A microwave oven cup was prepared in the same manner as in Example 1 except that one circular notch with a radius of 1 mm was formed at the yarn bottom.

  A microwave oven cup was prepared in the same manner as in Example 1 except that one semicircular cutout with a radius of 1 mm was formed at the lower end of the yarn bottom.

  A microwave oven cup was prepared in the same manner as in Example 1 except that one horizontal cutting line having a length of 3 mm was formed at the yarn bottom.

  The vapor deposition surface of the polyethylene terephthalate film (deposition thickness 30 nm) which vapor-deposited the silicon oxide which is an inorganic oxide, and the inner surface of paper were bonded together. The lamination was dry laminated using a two-component reaction type urethane adhesive. Next, on the surface of polyethylene terephthalate, the above adhesive was used as an anchoring agent, and an extruder was used to laminate 25 μm of polyethylene resin to prepare a barrel member. Using this barrel member, a microwave oven paper cup was formed in the same manner as in Example 1.

As a cover material, a polycarbonate film 15 μm, an ethylene vinyl alcohol film 15 μm as a gas barrier layer, a nylon film 12 μm in order, and a film 60 μm of a polyethylene resin / ethylene-vinyl acetate copolymer as a sealant layer were laminated to prepare a cover material. The constitution is: polycarbonate film 15 μm / ethylene vinyl alcohol film 15 μm / nylon film 12 μm / (film made of polyethylene resin / ethylene-vinyl acetate copolymer) 60 μm.

  Hereinafter, specific comparative examples of the present invention will be described.

<Comparative Example 1>
The same operation as in Example 1 was performed except that a cut line was not formed at the yarn bottom.

<Comparative example 2>
The same operation as in Example 6 was performed, except that a cut line was not formed at the yarn bottom.

<Evaluation method>
The microwave oven cups prepared in Examples 1-6 and Comparative Examples 1-2 were filled with 200 ml of water. In addition, the microwave oven paper cups of Example 6 and Comparative Example 2 were filled and then sealed with a lid material to prepare a paper container. The seal width was 1.5 mm.

  The microwave oven paper cups or paper containers of Examples 1 to 6 and Comparative Examples 1 and 2 each filled with water were used for 2.0 minutes in a microwave oven {manufactured by Sharp Corporation, microwave oven RE-F598H, 1000W}. Heating was performed. The burnt state of the yarn bottom was observed. The evaluation results were as follows: ○: no scorch was observed, ×: scorch was observed.

  Table 1 shows the evaluation results of Examples and Comparative Examples.

実施例１〜６では、糸尻部に焦げの発生は観られなかった。一方、比較例１〜２については、糸尻部がやや茶色に変色し焦げの発生が観られた。糸尻部に切込み線または切欠け部を設けたことにより、焦げが発生し難いのが判った。また実施例６、比較例２は、カップと蓋材とのシール部の一部が剥がれ蒸気が抜け、加熱された状態の紙容器であった。本発明の電子レンジ用紙カップおよびそれを用いた紙容器は、電子レンジで加熱されても、糸尻部に焦げが発生し難く、利便性の高いことが判った。

In Examples 1-6, the generation | occurrence | production of the burn was not seen in the thread | yarn bottom part. On the other hand, in Comparative Examples 1 and 2, the yarn bottom portion was slightly brown and the occurrence of scorching was observed. It has been found that scorching is unlikely to occur by providing a cut line or notch at the yarn bottom. Further, Example 6 and Comparative Example 2 were paper containers in a heated state in which a part of the seal portion between the cup and the lid member was peeled off and the steam was removed. It has been found that the microwave oven paper cup and the paper container using the same according to the present invention are not easily burnt at the yarn bottom portion even when heated in the microwave oven, and are highly convenient.

  The microwave oven paper cup of the present invention can be used for beverages such as coffee, tea and soup, sake such as sake and shochu, instant food such as instant noodles and yakisoba, and contents such as side dishes.

  The paper container of the present invention is a highly convenient container that can be heated in a microwave even when the contents are sealed.

DESCRIPTION OF SYMBOLS 1 ... Body member 2 ... Body part 3 ... Lower end surface of body part 4 ... Folding part 5 ... Bottom member 6 ... Bottom part 7 ... Bending part 8 ... Joining Part 9 ... top curl part 10 · thread end 20 · · cut line (vertical)
21. ・ Cutting line (horizontal)
22 ・ ・ Notch (Semicircle)
23 ・ ・ Notch (circular)
30 .. Lid material 31 .. Tab 40 .. Paper 41 .. Thermoplastic resin layer (polyethylene resin layer)
42 .. Inorganic oxide vapor deposition film 43.. Sealant layer 50.. Microwave paper cup of the present invention 60.. Microwave paper container of the present invention 70.. Conventional paper cup

Claims (3)

A microwave oven paper cup composed of a body member and a bottom member,
The body member has a body part, and a top curl part that curls the upper end part of the body part outward,
The bottom member includes a bottom surface portion and a bent portion obtained by bending the outer peripheral edge portion of the bottom surface portion downward at a substantially right angle;
The lower end portion of the body portion is folded inward, and a joined portion is formed that is joined in a state of sandwiching the bent portion,
At least one cut line or notch is formed in the joint ,
Microwave paper cup the shape of the switching chipping unit, characterized by semicircular or circular der Rukoto.   The microwave oven paper cup according to claim 1, wherein the cut line has a linear shape. Paper container characterized in that it uses a microwave paper cup according to claim 1 or 2.

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