JP2016050044A - Paper cup for electronic oven - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a flat bottom-type paper cup which is less likely to be burnt even when used in an electronic oven and which can stably support itself.SOLUTION: A paper cup for an electronic oven includes a cylindrical trunk member 11, and a bottom member 12 for closing a lower end of the trunk member 11. A lower end of the trunk member 11 is bent inward, and joined in such a manner as to cover an outer surface of a peripheral edge of the bottom member 12. A plurality of concave and convex parts 21 and 22 are arranged in such a manner as to be alternately formed on a joint part 20 that covers an outer surface of the bottom member 12. The concave parts 21 are flush with each other, and the convex parts 22 are flush with each other.SELECTED DRAWING: Figure 6

Description

  The present invention relates to a microwave oven paper cup (paper container). The term “for a microwave oven” does not mean that it is limited to a microwave oven only, but means that it can be used in a microwave oven.

  Paper cups are widely used not only for instant foods and snacks, but also as containers for beverages and prepared dishes. These paper cups may be cooked and cooked in a microwave oven with food, drinking water, etc. in them.

  When a paper cup containing the contents is heated and cooked in a microwave oven, there is a problem that the so-called yarn twist portion formed by extending the lower end portion of the body portion of the paper cup may be burnt. In particular, the amount of heat generated at the joint where the paper overlaps increases (the amount of heat released does not increase), and heat is likely to be stored, and scorching is likely to occur. On the other hand, since the generated heat is taken away by the contents at the portion in contact with the contents, the charring hardly occurs.

  In Patent Document 1, there is a microwave oven paper cup that includes a body portion and a bottom portion, a lower end portion (thread twist) of the body portion is bent inward, and is joined so as to cover the peripheral portion of the bottom portion from the outer surface. Have been described. Patent Document 2 describes a paper cup for a microwave oven in which an annular leg portion is formed by curling a joint portion between a body portion and a bottom portion inward.

JP 2003-81358 A JP 2003-192043 A

  By bending or curling the lower end of the body part (yarn twist) to eliminate the thread twist part, it is possible to prevent the occurrence of scorch even when heated in a microwave oven. However, if the lower end of the body part is bent inward, the bent part is randomly wrinkled. Since the bent portion is located at the bottom of the container, the flatness of the bottom surface of the cup is deteriorated, and stability may be lost when the cup is self-supporting. Also, random wrinkles may cause a random gap between the bent portion and the cup bottom surface, which may cause a problem of poor adhesion between the bent portion and the cup bottom surface.

  An object of the present invention is to provide a flat-bottom type paper cup that is hard to burn even when used in a microwave oven and that can stably stand by itself.

  Another object of the present invention is to make it difficult to cause the problem of poor adhesion between the bent portion and the bottom of the cup.

  A microwave oven paper cup according to the present invention comprises a cylindrical barrel and a bottom that closes the lower end of the barrel, and the lower end of the barrel is bent inward so as to cover the outer surface of the peripheral edge of the bottom. A plurality of concave surface portions and convex surface portions are alternately formed on the joint portion covering the outer surface of the bottom portion, and at least the convex surface portions are at the same height position.

  A plurality of concave portions and convex portions are alternately formed at a joint portion (bent lower end portion of the body portion) covering the outer surface of the bottom portion of the paper cup. Here, the concave and convex portions and the concave and convex portions of the convex portion are based on the bottom of the cup facing up. The convex surface portion protrudes outward rather than the concave surface portion, and therefore the paper cup is supported by the convex surface portion when the paper cup is self-supporting. The plurality of convex surface portions are provided intermittently (so that the concave surface portions are sandwiched) over the entire joint portion, and the plurality of convex surface portions are at the same height position, so that the paper cup according to the present invention stably stands by itself.

  There are slight steps between the plurality of concave and convex portions. Since a plurality of concave surface portions and convex surface portions are alternately formed in the joint portion, the steps between the concave surface portion and the convex surface portion are regularly arranged in the joint portion. According to the present invention, the concave surface portions and the convex surface portions are alternately formed and formed so that a plurality of steps are regularly formed in the joint portion. Since excess portions of the joint portion bent inward by a plurality of steps (portions that become wrinkles when bent inward) are absorbed, random wrinkles are not formed in the joint portion. Random wrinkles do not interfere with the paper cup's independence.

  Further, the joint portion covering the outer surface of the bottom of the paper cup surely adheres to the outer surface of the bottom of the paper cup in the range of the concave surface portion. Like the convex surface, the multiple concave surfaces are also provided intermittently (with the convex surface in between) throughout the joint, so that the joint is firmly joined to the bottom outer surface of the paper cup throughout the joint. Can do. For this reason, the problem of poor adhesion between the outer surface of the bottom of the paper cup and the joint is unlikely to occur. In addition, since the level | step difference between the concave-surface part of a junction part and a convex-surface part is slight and it is along the bottom outer surface of a paper cup as a whole, even if it heats with a microwave oven, it is hard to produce a burn.

  In one embodiment, a fold-in part (squeezing line) that cuts into the base of the convex part is formed in each of the boundaries between the concave part and the convex part in a direction toward the center of the bottom part. Since the step between the concave surface portion and the convex surface portion can be crushed (crushed), the step between the concave surface portion and the convex surface portion can be reduced. The bottom outer surface of the paper cup can be brought closer to a flatter overall.

  In one embodiment, a heat insulating layer is provided on the outermost layer at the bottom of the paper cup. Even if hot contents are put in a paper cup or the contents are heated by a microwave oven, even if it is touched with a finger, it does not feel the heat.

  You may provide a heat insulation layer in at least one of the outer surface or inner surface of the trunk | drum of the said paper cup. A heat insulation effect (heat insulation effect) can be expected. Also, you don't have to feel the heat when you touch the torso with your hand.

  In another embodiment, an outer cylinder member is placed on and fixed to the outside of the body portion. This embodiment can also be expected to have a heat insulation effect (heat insulation effect), and does not feel heat when touching the body.

  Preferably, an inward turn is formed at the lower end of the outer cylinder member. For example, the return is realized by folding the lower end portion of the outer cylinder member inward or by curling the lower end portion of the outer cylinder member inward. Since a heat insulating space is secured between the body portion of the paper cup and the outer cylinder member, the heat insulating effect of the microwave oven paper cup can be further enhanced.

It is a partially broken front view of a microwave oven paper cup. It is a bottom view of the microwave oven paper cup which follows the II-II line of FIG. FIG. 3 is an enlarged cross-sectional view of an annular joint along line III-III in FIG. 2. The formation process of an annular junction is shown. The formation process of an annular junction is shown. The formation process of an annular junction is shown. It is sectional drawing of the paper cup lower part which shows the modification of the junction part of a trunk | drum member and a bottom member. It is sectional drawing of the paper cup lower part which shows the other modification of the junction part of a trunk | drum member and a bottom member. It is sectional drawing of the paper cup lower part which shows the further another modification of the junction part of a trunk | drum member and a bottom member. It is a partially broken front view of the microwave oven paper cup which covered the outer cylinder member. It is a partially broken front view of the other microwave oven paper cup which covered the outer cylinder member. It is a partially broken front view of the microwave oven paper cup of a modification. It is the elements on larger scale of the paper cup shown in FIG. It is a partially broken front view of the microwave oven paper cup of another modification. It is the elements on larger scale of the paper cup shown in FIG.

  Hereinafter, a microwave oven paper cup according to the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a front view showing a part of a microwave oven paper cup according to an embodiment of the present invention. FIG. 2 is a bottom view of the microwave oven paper cup taken along line II-II in FIG. FIG. 3 is an enlarged sectional view taken along line III-III in FIG. In FIG. 1 and FIG. 3, for the sake of clarity, the thicknesses of the members constituting the paper cup are highlighted.

  The microwave oven paper cup 10 includes a body member 11 and a bottom member 12 whose main strength material is paper. The body member 11 has a cylindrical shape with a large upper diameter and a smaller diameter as it goes down. The upper end portion of the body member 11 is wound outward (in a direction away from the portion in which the contents of the paper cup 10 enter, outward), and a so-called curl portion (top curl portion) 11A is formed. The curled portion 11A is covered with a lid (not shown) or joined (adhered or welded).

  The lower end of the body member 11 is bent at a substantially right angle (the direction toward the portion into which the contents of the paper cup 10 enter, inward) (the bent portion is indicated by 11B), and the tip of the bent portion 11B is inward. It is folded (the folded portion is indicated by reference numeral 11C). The bottom member 12 is circular, and its peripheral portion 12A fits snugly into the lower end of the body member 11. The peripheral portion 12A of the bottom member 12 is folded outward (the folded portion is indicated by reference numeral 12B), and the folded portion 12B of the bottom member 12 is sandwiched between the bent portion 11B and the folded portion 11C of the body member 11. It is. These portions 12A, 11C, 12B, 11B sandwiched between each other are joined (adhered, welded) (fixed) to each other at least partially, preferably entirely. Depending on the contents, a protective film (resin film, resin film, etc.) is coated on the inner surface and / or outer surface of the body member 11 and the bottom member 12 as necessary. Specific examples of the protective film include polyethylene (PE), polypropylene (PP), polyester, ethylene / vinyl acetate copolymer, and the like. These also have an advantage that they can be used for bonding by heat sealing.

  The bent portion 11B and the folded portion 11C of the body member 11 and the folded portion 12B of the bottom member 12 are attached to the peripheral edge of the outer surface of the bottom member 12 of the paper cup 10 so as to cover the ring. Hereinafter, the entire annular portion joined to the peripheral edge portion of the outer surface of the bottom member 12 of the paper cup 10 is referred to as “annular joining portion 20”.

  Referring to FIG. 2, when the bottom surface of the paper cup 10 is viewed, it is confirmed that the annular joint portion 20 is annularly provided on the outer peripheral edge portion of the bottom member 12. On the surface of the annular joint portion 20, substantially rectangular concave surface portions 21 and convex surface portions 22 are alternately formed and arranged in an annular shape. The width of the concave surface portion 21 and the convex surface portion 22 (the length in the annular direction) are substantially the same, or the width of the concave surface portion 22 is slightly longer. In the paper cup 10 of this embodiment, 16 concave surface portions 21 and 16 convex surface portions 22 are alternately arranged. The number of the concave surface portions 21 and the convex surface portions 22 can be adjusted as appropriate.

  Referring to FIG. 3, the surfaces of the plurality of concave surface portions 21 are at substantially the same height position, and the surfaces of the plurality of convex surface portions 22 are also at substantially the same height position. The convex surface portion 22 slightly protrudes outward (that is, toward the bottom of the paper cup 10) than the concave surface portion 21. Further, the boundary between the concave surface portion 21 and the convex surface portion 22 is slightly inclined so as to bite toward the base 26 of the convex surface portion 22. A portion that bites toward the base 26 of the convex surface portion 22 at the boundary between the concave surface portion 21 and the convex surface portion 22 is hereinafter referred to as a “folded portion 25”. The concave surface portion 21 and the convex surface portion 22 are slightly overlapped by the folding portion 25, and the step between the concave surface portion 21 and the convex surface portion 22 is considerably small. When viewed from the bottom, the folded portion 25 at the boundary between the concave surface portion 21 and the convex surface portion 22 appears to be a streak (ruled line) that extends in a direction toward the center of the bottom member 12 (see FIG. 2). When the 16 concave surface portions 21 and the 16 convex surface portions 22 are alternately arranged, 32 folded portions 25 appear in the annular joint portion 20 at equal angular intervals.

  If the annular joint 20 is simply bent inward without any treatment, wrinkles will randomly enter the annular joint 20 due to the excess portion. If wrinkles enter at random, the bottom of the cup (the surface of the annular joint 20) is difficult to be flat, and lacks a sense of stability when the cup is self-supporting. On the other hand, in the paper cup 10 described above, 16 concave surface portions 21 and 16 convex surface portions 22 are regularly and alternately formed and arranged in an annular shape, and the folding portions 25 are also regularly spaced at equal angular intervals. Are lined up. The surface of the convex surface portion 22 is at approximately the same height, and this is regularly present over the entire circumference of the annular joint 20. Furthermore, since a surplus portion when the annular joint 20 is bent inward is absorbed by the step (folded portion 25) between the concave surface portion 21 and the convex surface portion 22, random wrinkles do not occur in the annular joint portion 20. The paper cup 10 becomes stable and independent.

  Referring to FIG. 3, the annular joint 20 (the folded portion 11 </ b> C of the body member 11) is in close contact with the peripheral edge 12 </ b> A of the bottom member 12 of the paper cup 10 at the concave surface portion 21. The annular joint 20 and the bottom member 12 of the paper cup 10 can be firmly joined. Since the concave surface portions 21 are regularly present at equal intervals over the entire circumference of the annular joint portion 20, the problem of poor adhesion between the bottom member 12 and the annular joint portion 20 is unlikely to occur. Furthermore, since the paper cup 10 does not have a yarn twist, it is difficult to burn even when heated in a microwave oven.

  4 to 6 show a state of manufacturing the paper cup 10 described above. 4 to 6 show the paper cup 10 upside down.

  Referring to FIG. 4, a paper cup having a stringer that is not bent at first is formed.

  Referring to FIG. 5, a pressing die having a width obtained by dividing the circumferential length of annular joint 20 by, for example, 32 is pressed from the outside of annular joint 20 with a predetermined interval and pressed. The pressed portion becomes the concave surface portion 21, and the unpressed portion becomes the convex surface portion 22. Sixteen concave surface portions 21 and sixteen convex surface portions 22 are alternately formed in the annular joint portion 20 in an annular shape. By being pressed from the outside, the entire annular joint 20 is slightly inclined inward.

  Referring to FIG. 6, ultrasonic pressing is performed from the outside of the annular joint 20 inclined inward. The annular joint 20 is completely bent and joined to the bottom member 12. In addition, a folded portion 25 is formed at the boundary between the concave surface portion 21 and the convex surface portion 22. The microwave oven paper cup 10 with a flat bottom is completed.

  7 and 8 show modified examples of the annular joint (bent portion). In this modification, the peripheral edge portion 12A of the bottom member 12 is folded outward, and the bent portion 11B of the lower end portion of the body member 11 is bonded or welded to the outer surface of the folded portion 12B. In the modification shown in FIG. 7, the length of the bent portion 11B of the barrel member 11 is long, and the entire folded portion 12B of the bottom member 12 is covered with the bent portion 11B of the barrel member 11 in the annular joint portion 20A. In the modification shown in FIG. 8, the length of the folded portion 12B of the bottom member 12 is long at the annular joint 20B. Of course, the lengths of the bent portion 11B of the barrel member 11 and the folded portion 12B of the bottom member 12 are adjusted so that the end surface of the bent portion 11B of the barrel member 11 and the end surface of the folded portion 12B of the bottom member 12 are flush with each other. May be.

  FIG. 9 shows still another modification. In this modification, a heat insulating layer 31 is provided on the outer surface of the bottom member 12. The heat insulating layer 31 is made of, for example, a foamed plastic such as low density polyethylene mixed with a foaming agent (such as sodium hydrogen carbonate). Foaming occurs when the foamed plastic mixed with the foaming agent is heated. In addition, foaming is performed after the paper cup 10 is formed, and foaming of the joined portion such as the folded portion 12B is suppressed. By providing the heat insulating layer 31 on the bottom member 12, when the paper cup 10 containing hot contents or the paper cup 10 heated by the microwave oven is held by hand, no heat is felt even if the finger touches the bottom.

  FIG. 10 shows still another modification, in which an outer cylinder member 13 is covered on a body member 11. The outer cylinder member 13 is a cylindrical body whose upper part has a slightly larger diameter than the lower part, and the lower end part is folded inward (folded part 13A). The body member 11 having the bottom member 12 is completely inserted (inserted) into the outer cylinder member 13 from above. The upper end of the outer cylinder member 13 enters a gap inside the curled portion 11A of the body member 11. A heat insulating space (a gap) is formed between the outer surface of the body member 11 and the inner surface of the outer cylinder member 13. The outer cylinder member 13 is fixed to the body member 11 with an adhesive at one or both of the position of the curled portion 11A and the position of the folded portion 13A.

  By providing the outer cylinder member 13 on the outer side of the body member 11, heat is not felt even when the body portion of the paper cup 10 is held by hand. In addition, the heat insulation (heat retention) of the entire paper cup 10 is improved.

  As shown in FIG. 11, a curled portion 13 </ b> B that is wound inward may be formed at the lower end portion of the outer cylinder member 13. The heat insulation space (gap) between the outer surface of the trunk member 11 and the inner surface of the outer cylinder member 13 can be increased.

  FIG. 12 shows a modified paper cup 10 </ b> A in which a heat insulating layer 32 is provided on the outer surface of the body member 11. FIG. 13 is an enlarged view of a part of the paper cup 10A of the modification shown in FIG. The heat insulating layer 32 is formed, for example, by foaming low density polyethylene. Foaming is performed after the paper cup 10A is formed, and foaming of the joined portion such as the folded portion 12B is suppressed. When holding the body of the paper cup 10A containing the hot contents or the paper cup 10A heated by the microwave oven, it is not necessary to feel the heat. It can also be expected to keep warm.

  When the body member 11 (paper layer) is heated, the moisture contained in the body member 11 evaporates. Water evaporating from the body member 11 can be used to foam low density polyethylene. In order to prevent moisture that evaporates from escaping, a water vapor blocking layer 33, for example, medium density polyethylene, is preferably provided on the inner surface of the barrel member 11, whereby the moisture contained in the barrel member 11 is reduced to low density polyethylene ( It can be efficiently evaporated toward the heat insulating layer 32). A printed layer (ink layer) may be further formed on the outer surface (surface) of the heat insulating layer 32.

  FIG. 14 shows a modified paper cup 10 </ b> B in which a heat insulating layer 34 is provided on the inner surface of the body member 11. FIG. 15 is an enlarged view of a part of the paper cup 10B of the modification shown in FIG. For example, a polyethylene layer 34 containing a foaming agent (sodium hydrogen carbonate or the like) is laminated on the inner surface of the body member 11, and a polyethylene layer 35 in which no foaming agent is mixed is further laminated on the inner surface. By heating, the polyethylene layer containing the foaming agent foams and the heat insulating layer 34 is formed. Foaming of the joint portion such as the folded portion 12B is suppressed. Further, foaming can be suppressed by preventing heating in the vicinity of the flange 11A. A heat insulating layer may be provided on both the outer surface and the inner surface of the body member 11.

10, 10A, 10B Microwave oven paper cup
11 Torso
12 Bottom member
13 Outer cylinder member
20, 20A, 20B annular joint
21 Concave surface
22 Convex part
25 Folding part
26 Root
31, 32, 34 Thermal insulation layer

Claims (6)

A cylindrical body and a bottom that closes the lower end of the body; the lower end of the body is bent inward and joined so as to cover the outer surface of the peripheral edge of the bottom;
A plurality of concave and convex portions are alternately formed on the joint covering the outer surface of the bottom,
At least the convex portions are at the same height,
Microwave paper cup. At each of the boundaries between the concave surface portion and the convex surface portion, a folded portion that bites toward the base of the convex surface portion is formed in a direction toward the center of the bottom portion,
The microwave oven paper cup according to claim 1. A heat insulating layer is provided on the outermost layer at the bottom,
The microwave oven paper cup according to claim 1. A heat insulating layer is provided on at least one of the outer surface and the inner surface of the body portion;
The microwave oven paper cup according to claim 1. An outer cylinder member is placed on the outside of the body and fixed,
The microwave oven paper cup according to claim 1. An inward turn is formed at the lower end of the outer cylinder member,
The microwave oven paper cup according to claim 5.

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