JP2014005012A - Paper cup for heating with microwave oven - Google Patents

Abstract

Disclosed is a microwave oven heated paper cup that is less likely to be burnt at a yarn tail portion even when the contents are stored and heated in a microwave oven.
A microwave oven heating paper cup comprising a barrel member and a bottom member, the barrel member having a cylindrical barrel portion, the bottom member having a bottom surface portion and a peripheral edge of the bottom surface portion downward. A bent portion bent at a substantially right angle, and the lower end side of the body portion is folded inward with the bent portion interposed therebetween to form a yarn bottom portion, and the lower end of the yarn bottom portion is corrugated along the circumferential direction. It is characterized by becoming.
[Selection] Figure 1

Description

  The present invention relates to a microwave oven heated paper cup.

  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 heating a microwave oven are not yet common, but are used for cooking, for example, popcorn, and are used to heat contents such as instant foods, beverages and prepared dishes.

  As shown in FIG. 7, a general paper cup is formed by forming a body blank 9 into a cylindrical shape and providing a body member 1 provided with a body bonding portion 1a and an outer peripheral edge of a bottom blank 10 downward substantially at a right angle. The body member 1 is formed mainly by forming the body part 2 and curling the upper end outward to form the top curl part 3 and folding the lower end inward. A folded portion 8 is formed. The bottom member 5 includes a horizontal bottom surface portion 6 and the bent portion 7 described above. In joining the body member 1 and the bottom member 5, the bent portion 7 is sandwiched between the folded-back portion 8 of the body member 1 and the lower end portion of the body portion 2 and heat-bonded. A joined portion that is joined with the bent portion 7 interposed therebetween is referred to as a yarn bottom portion 4 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 if the microwave oven has high output or is irradiated with microwaves for a long time. 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. 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, which causes the temperature to rise and cause scorching. Further, the yarn bottom portion is not in contact with the contents, and sufficient heat dissipation cannot be obtained with respect to the heat generation amount.

  In order to improve these, the bottom surface of the paper cup is formed in a concave shape downward, and the distance between the bottom surface of the bottom surface and the bottom surface formed by the bottom of the body is less than 8 mm upward from the bottom surface, There is a paper cup for a microwave oven in a range of less than 2 mm downward from the lower end surface (Patent Document 1).

  This microwave-compatible paper cup has a bottom surface portion that is recessed downward to reduce microwave irradiation to the yarn bottom as much as possible. However, even this may cause burns. This is a case where heat is generated and scorching occurs because the total thickness of the paper at the yarn bottom does not change. Therefore, there is a problem even if the microwave irradiation of the microwave oven is reduced.

  There is also a heat insulating paper cup for a microwave oven in which a paper tape is provided with a protective cover on the outer periphery of the paper cup body, a metal tape is attached to the protective cover, and the yarn tail is shielded from microwaves (Patent Document 2).

  Although it is possible to shield the microwave of a microwave oven with a metal tape, for example, when the sticking of the metal tape is shifted, there is a risk that the metal portion may spark in the microwave oven.

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 container made of microwave oven paper (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.

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

  As described above, there is still a demand for a microwave-heated paper cup that does not easily cause scorching at the yarn tail even if the paper cup containing the contents is heated by the microwave.

  The present invention has been made in view of the circumstances described above, and it is an object of the present invention to provide a microwave oven heated paper cup that is less likely to be burnt at the yarn bottom even if the contents are stored and heated in a microwave oven. .

The invention according to claim 1 of the present invention is a microwave heating paper cup comprising a body member and a bottom member,
The barrel member has a cylindrical barrel portion, and the bottom member has a bottom surface portion and a bent portion that is bent substantially perpendicularly downward at the peripheral side of the bottom surface portion, and sandwiches the bent portion. A microwave heating paper cup, wherein the lower end side of the body portion is folded inward to form a yarn bottom portion, and the lower end of the yarn bottom portion is corrugated along the circumferential direction. .

  The invention according to claim 2 of the present invention is characterized in that the barrel member has a top curl portion curled outward at the upper end side of the barrel portion, and the top curl portion is flat. It is a microwave oven heating paper cup of Claim 1.

  The invention according to claim 3 of the present invention is characterized in that a molded ring made of a synthetic resin having a flat upper portion is provided at the upper end of the body portion. It is a cup.

  In the microwave heating paper cup of the present invention, when the contents are stored and heated in the microwave oven, the yarn bottom portion is hardly burnt. In the invention according to claim 2, when the lid is bonded by heat sealing or the like, the bonding area between the lid and the top curl portion is widened and can be stably bonded. Further, the invention according to claim 3 is provided with a synthetic resin molding ring having a flat upper portion. Therefore, when the lid is bonded by heat sealing or the like, the lid is attached to the synthetic resin molding ring having a flat upper portion. Since it adheres, it can adhere reliably.

It is explanatory drawing which showed typically an example of the microwave oven heating paper cup of this invention in the front. It is explanatory drawing which showed typically an example of the microwave oven heating paper cup of this invention in the cross section. (A), (B) It is explanatory drawing which showed typically the cross section of the top curl part of an example of the microwave oven heating paper cup of this invention. It is explanatory drawing which showed typically the other example of the microwave oven heating paper cup of this invention in the cross section. (A), (B), (C) It is explanatory drawing which showed typically the laminated body used for an example of the microwave heating paper cup of this invention in the cross section. It is explanatory drawing which showed typically the manufacturing method of an example of the microwave oven heating paper cup of this invention. It is explanatory drawing which showed typically the manufacturing method of an example of the conventional paper cup.

Hereinafter, modes for carrying out the present invention will be described.
FIG. 1 is an explanatory view schematically showing an example of a microwave heating paper cup of the present invention on the front side. FIG. 2 is an explanatory view schematically showing a cross section of an example of the microwave heating paper cup of the present invention. FIGS. 3A and 3B are explanatory views schematically showing a top curl portion of an example of the microwave heating paper cup of the present invention in cross section. FIG. 4 is an explanatory view schematically showing a cross section of another example of the microwave heating paper cup of the present invention.

  As shown in FIG. 1, the microwave heating paper cup 100 of this example has a body member 1 having a body part 2 and a top curl part 3 that curls the upper end part of the body part 2 outward, and a thread at the lower end part. The bottom end of the yarn bottom 4 is corrugated in the circumferential direction.

  As shown in FIG. 2, the yarn bottom portion 4 includes a bottom member 5 having a bottom surface portion 6 and a bent portion 7 in which an outer peripheral edge portion of the bottom surface portion 6 is bent substantially perpendicularly downward. The lower end of the body member 1 is folded inward to form a folded portion 8 and is heat-bonded by sandwiching the bent portion 7 of the bottom member 5, so that the folded portion 8, the bent portion 7, and the body member 1 outside thereof are The thread bottom part 4 is formed at the lower part.

  The bottom surface portion 6 is provided so as to float from the lower end of the microwave heating paper cup 100 by the yarn bottom portion 4. Therefore, when heated in a microwave oven, the portion above the bottom surface portion 6 of the microwave heating paper cup 100 does not become hot because the contents absorb microwaves, but the yarn tail portion 4 tends to become hot.

  In the microwave heating paper cup 100 of this example, the lower end of the yarn bottom portion 4 is corrugated in the circumferential direction, air can flow between the lower surface such as a turntable of the microwave oven, and has a heat dissipation effect, The yarn bottom 4 is prevented from being burnt.

  The top curl portion 3 is formed by curling the upper end portion of the body portion 2 outward to form a top curl portion 3 having a circular cross section as shown in FIG. The curled portion 3 is sandwiched and pressed by a mold or the like so as to be flat as shown in FIG.

  At this time, the thermoplastic resin portion is melted with ultrasonic waves and then cooled to fix the flat state firmly. Thus, by flattening the top curl portion 3, when the lid is bonded to the microwave heating paper cup 100 by heat sealing or the like, the bonding area between the lid and the top curl portion 3 is widened and stably bonded. Can do.

  Further, as shown in FIG. 4, a synthetic resin molding ring 3 a having a flat upper portion may be provided on the top curl portion 3 at the upper end of the body portion 2. By providing the molding ring 3a made of a synthetic resin with a flat upper portion, when the lid is adhered by heat sealing or the like, the lid can be securely adhered.

  FIG. 5 is an explanatory view schematically showing a cross section of a laminate used in an example of the microwave heating paper cup of the present invention.

  As shown in FIG. 5 (A), the laminate constituting the body member 1 and the bottom member 5 of the microwave heating paper cup 100 of this example has a paper base material 11, a thermoplastic resin layer 12 on the outside, and a thermoplastic resin on the inside. A resin layer 13 is provided. Depending on the contents, barrier properties may be required, and a barrier layer 14 may be provided between the paper base 11 and the inner thermoplastic resin layer 13 to use a laminate as shown in FIG. .

  Further, a printing layer (not shown) is generally provided on the outer surface of the outer thermoplastic resin layer 12. In particular, when cosmetics are required, a resin film layer 16 provided with a printing layer 15 is provided between the paper substrate 11 and the outer thermoplastic resin layer 12, and a laminate as shown in FIG. 5C is used. May be.

  The outer thermoplastic resin layer 12 and the inner thermoplastic resin layer 13 provide the water resistance, moisture resistance, oil resistance and paper rigidity of the paper base 11 in addition to joining the body member 1 and the bottom member 5. Laminate for.

  For the thermoplastic resin layer 12 and the thermoplastic resin layer 13, thermoplastic 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. As thickness of the thermoplastic resin layer 12 and the thermoplastic resin layer 13, the range of 15-60 micrometers is preferable. What is necessary is just to determine suitably from the required quality of the contents.

As the paper substrate 11, commonly used cup base paper, milk carton base paper, kraft paper and the like can be used. The basis weight is not particularly limited, but the base member 1 is preferably a cup base paper in the range of 150 to 300 g / m ² . 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.

Moreover, although the basic weight of the paper base material 11 used for the bottom member 5 is not specifically limited, the cup base paper of the range of 150-250 g / m < ² > is preferable. 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 obtain a strength-stable paper cup, it is preferable that the basis weight of the paper base 11 used by the body member 1 is higher than the basis weight of the paper base 11 used for the bottom member 5.

  As the barrier layer 14, a vapor deposition film in which an inorganic oxide such as aluminum oxide, silicon oxide, or magnesium oxide is vapor-deposited to a thickness of about 20 to 100 nm can be used. Although the base material used for this vapor deposition film is not specifically limited, Preferably the stretched polyethylene terephthalate film is used.

  In addition, as the barrier layer 14, a resin film having a high barrier property can be used. For example, an ethylene / vinyl alcohol copolymer resin film or a so-called MXD nylon film made of metaxylenediamine / adipic acid can be used.

When the resin film layer 16 provided with the printing layer 15 is provided between the paper substrate 11 and the outer thermoplastic resin layer 12, the stretched film is preferable as the resin film used for the resin film layer 16. A film of polyethylene terephthalate, nylon, polypropylene or the like can be used, and a stretched polyethylene terephthalate film is particularly preferably used.

  The paper substrate 11 and the barrier layer 14 can be bonded together by a melt extrusion lamination method through polyethylene. Further, it can be bonded by a dry laminating method using a two-component reaction type polyurethane resin adhesive.

Next, the manufacturing method of the microwave oven paper cup of this invention is demonstrated.
FIG. 5 is an explanatory view schematically showing a manufacturing method of an example of a microwave heating paper cup of the present invention.

  The microwave heating paper cup 100 has a fan-shaped or rectangular body blank 9 punched out from the above-described laminates as shown in FIG. 5A and a corrugated peripheral edge as shown in FIG. The bottom blank 10 is formed, the body blank 9 is wound into a cylindrical shape, both ends are overlapped and heat-sealed to form the body bonding portion 1a, and the body 2 is formed. FIG. The trunk member 1 is created. The bottom blank 10 bends the outer peripheral edge downward substantially at a right angle to form a bent portion 7, thereby creating a bottom member 5 as shown in FIG.

  Next, the bottom member 5 is inserted into the body member 1 as shown in FIG. Then, as shown in FIG. 2, the lower end side of the body portion 2 is folded inward with the bent portion 7 of the bottom member 5 interposed therebetween to form the folded portion 8, and the folded portion 8, the bent portion 7, and the bent portion 7 are formed. And the lower part of the outer body part 2 is heat-bonded to form the thread end part 4.

  And if necessary, the lower end of the yarn bottom portion 4 is pressed in accordance with the corrugation of the lower end of the bent portion 7 of the bottom member 5, and the lower end of the yarn bottom portion 4 is surely corrugated along the circumferential direction. To do.

  Thus, when the lower end of the yarn bottom portion 4 has a wave shape along the circumferential direction, when the contents are stored and heated in the microwave, the yarn bottom portion 4 and the lower surface of the microwave oven A corrugated gap is formed between them, and ventilation becomes easy.

  Next, after curling the upper end side of the body portion 2 outward to form the top curl portion 3 as shown in FIG. 3 (A), the top curl portion 3 is vertically sandwiched and pressed by a mold or the like, After the thermoplastic resin portion is melted by ultrasonic waves, it is cooled to flatten the top curl portion 3 as shown in FIG.

  Thus, by flattening the top curl portion 3, when the lid is bonded to the microwave heating paper cup 100 by heat sealing or the like, the bonding area between the lid and the top curl portion 3 is widened and stably bonded. Can do.

  As described above, the microwave oven heated paper cup 100 of this example as shown in FIGS. 1 and 2 can be manufactured.

  Further, as shown in FIG. 4, when the top curl 3 at the upper end of the body 2 is provided with a molding ring 3a made of synthetic resin with a flat upper portion, the molding ring 3a is made by injection molding with synthetic resin in advance. Then, the microwave heating paper cup 100 is inserted into the anvil of the ultrasonic sealing machine, the molding ring 3a is attached to the top curl portion 3, and energy is applied while pressing the upper surface of the molding ring 3a with a horn. What is necessary is just to adhere | attach the shaping | molding ring 3a to the top curl part 3, processing the part 3 flatly.

As another method, a microwave heating paper cup 100 having a flat top curl portion 3 is attached to an injection molding die, and a molding ring 3a is molded by injection molding, and at the same time, is adhered to the top curl portion 3. May be.

  Thus, by providing the molding ring 3a made of a synthetic resin with a flat upper portion, when the lid is bonded by heat sealing or the like, it can be securely bonded.

  The microwave heating paper cup 100 of this example 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.

  The lid member is preferably made of a laminated film having a sealant layer that can be thermally bonded to the thermoplastic resin layer 13 of the microwave heating paper cup 100 and can be easily peeled, and is laminated with a base film. Moreover, you may laminate | stack a barrier layer as needed.

  As the sealant layer, a cohesive peel type or interface peel type sealant that can be easily peeled can be used in accordance with the thermoplastic resin layer 13.

  As the base film, a stretched film of polyethylene terephthalate or polypropylene or a stretched or unstretched film of nylon can be used. As the barrier layer, the same barrier layer 14 used in the above-described microwave heating paper cup 100 can be used.

  Specific examples of the present invention will be described below.

<Example 1>
For the laminate used for the body member 1, a cup base paper having a basis weight of 250 g / m ² to be used as the paper base 11 is prepared, and an outer surface of the cup base paper is laminated with 25 μm of polyethylene resin, and the thermoplastic resin layer 12 is provided. It was.

  On the opposite inner surface, a laminated film in which 25 μm of low density polyethylene resin of thermoplastic resin layer 13 is laminated on 12 μm of silicon oxide-deposited polyethylene terephthalate stretched film of barrier layer 14 is laminated with a two-component curable urethane adhesive by dry lamination Together, a laminate was obtained.

For the laminate used for the bottom member 5, a cup base paper having a basis weight of 220 g / m ² to be used as the paper base 11 is prepared, and a thermoplastic resin layer 12 is provided by laminating 25 μm of polyethylene resin on its outer surface using an extruder. It was.

  A laminated film obtained by laminating 25 μm of polyethylene resin of thermoplastic resin layer 13 on 12 μm of aluminum oxide-deposited polyethylene terephthalate stretched film of barrier layer 14 is laminated on the opposite inner surface by dry lamination. A laminated body was obtained.

  Each laminate was punched out to produce a fan-shaped body blank 9 as shown in FIG. 5A and a bottom blank 10 having a corrugated peripheral edge as shown in FIG. 5B.

  Next, the body blank 9 is wound into a cylindrical shape, and both ends are overlapped and heat sealed to form a body bonding portion 1a to form the body 2 to form a body member as shown in FIG. 1 was created. Further, the bottom blank 10 was formed by bending the outer peripheral edge portion downward at a substantially right angle to form a bent portion 7 to form the bottom member 5 as shown in FIG. .

  The bottom member 5 is inserted into the barrel member 1 as shown in FIG. 5E, and the lower end side of the barrel portion 2 is folded inward with the bent portion 7 of the bottom member 5 interposed therebetween to form a folded portion 8. The folded portion 8, the bent portion 7, the bent portion 7, and the lower portion of the outer body portion 2 were heat-bonded to form the yarn bottom portion 4.

  The lower end of the yarn bottom portion 4 was pressed in accordance with the corrugation of the lower end of the bent portion 7 of the bottom member 5, and the lower end of the yarn tail portion 4 was corrugated along the circumferential direction as shown in FIG.

  Next, after curling the upper end side of the body portion 2 outward to form the top curl portion 3 as shown in FIG. 3 (A), the top curl portion 3 is vertically sandwiched and pressed by a mold or the like, The thermoplastic resin portion was melted with ultrasonic waves and then cooled to flatten the top curl portion 3 as shown in FIG.

  As described above, the microwave heating paper cup of Example 1 in which the length in the height direction of the yarn bottom portion 4 was 10 mm and the content of the contents was 200 ml was manufactured.

<Example 2>
The microwave oven heating paper cup 100 having a flat top curl portion 3 according to the first embodiment is mounted on an injection mold, and a molding ring 3a is formed by injection molding, and at the same time, the top curl portion 3 is adhered to the top curl portion 3. A microwave oven heated paper cup was manufactured.

  Below, the comparative example of this invention is demonstrated.

<Comparative Example 1>
The shape of the bottom blank 10 is a circular shape without the peripheral edge being corrugated, the lower end of the yarn bottom portion 4 is not corrugated along the circumferential direction, and is a conventional flat lower end shape, and the top curl portion is pressed. A microwave heating paper cup of Comparative Example 1 as shown in FIG. 6 was manufactured in the same manner as in Example 1 except that the cross-section was kept circular without being flattened.

<Test method>
200 ml of sake was put in the microwave heating paper cups of Example 1, Example 2 and Comparative Example 1, and a blend resin in which polybutene-1 was blended with polyethylene resin of a sealant layer in 12 μm of a silicon oxide vapor-deposited polyethylene terephthalate film was 25 μm The lid made of the laminated film was heat-sealed on the flat top curl portion of the microwave heating paper cup.

  Remove the lid of the microwave heating paper cup of Example 1, Example 2 and Comparative Example 1 filled with this sake, in a microwave oven {Sharp Co., Ltd., microwave oven RE-Z7, 550W}, The heating time was 1 minute, 1 minute 30 seconds and 2 minutes, and the burnt state of the yarn bottom was observed. Evaluation was made with a microwave oven heated paper cup in which no scorch was observed as ◯ and a microwave oven heated paper cup in which there was scorch as x. The results are summarized in Table 1.

以下に、実施例と比較例との比較結果について説明する。

Below, the comparison result of an Example and a comparative example is demonstrated.

<Comparison result>
In the microwave heating paper cups of Example 1 and Example 2 in which the lower end of the yarn bottom portion was corrugated along the circumferential direction, no charring was observed in the yarn bottom portion. On the other hand, with respect to the microwave oven heated paper cup of Comparative Example 1 in which the conventional yarn bottom portion is one end, the yarn bottom portion was slightly browned and burnt was observed.

  As a result, it was found that the microwave oven paper cup of the present invention is highly convenient because it does not easily cause scorching at the yarn tail portion even when heated in a microwave oven or excessively.

  In addition, since the top curl portion of the microwave heating paper cup of Example 1 is flat, it can be stably adhered without leakage of the contents when the lid material is heat sealed to the top curl portion. It was.

  Moreover, in the microwave heating paper cup of Example 2, since the molding ring made of a synthetic resin with a flat upper portion is provided, when the lid is bonded by a heat seal or the like, there is no risk of the contents leaking out. We were able to adhere with confidence.

  On the other hand, in the microwave oven heated paper cup of Comparative Example 1, the contents leaked when the lid member was heated and sealed to the top curl portion.

DESCRIPTION OF SYMBOLS 100 ... Microwave heating paper cup 1 ... Body member 1a ... Body part bonding part 2 ... Body part 3 ... Top curl part 3a ... Molding ring 4 ... Yarn bottom part 5 ... Bottom member 6 ... Bottom part 7 ... Bent part 8 ... Folded part 9 ... Body blank 10 ... Bottom blank 11 ... Paper base material 12 ... Thermoplastic Resin layer 13 ... thermoplastic resin layer 14 ... barrier layer 15 ... printed layer 16 ... resin film layer

Claims (3)

A microwave heating paper cup comprising a body member and a bottom member,
The barrel member has a cylindrical barrel portion, and the bottom member has a bottom surface portion and a bent portion that is bent substantially perpendicularly downward at the peripheral side of the bottom surface portion, and sandwiches the bent portion. A microwave heating paper cup, wherein a lower end side of the body portion is folded inward to form a yarn bottom portion, and the lower end of the yarn bottom portion is corrugated along the circumferential direction.   2. The microwave oven heated paper cup according to claim 1, wherein the body member has a top curl part curled outward at an upper end side of the body part, and the top curl part is flattened. .   The microwave heating paper cup according to claim 1, wherein a synthetic resin molding ring having a flat upper portion is provided at an upper end of the body portion.

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