JP6221264B2 - Microwave paper cup - Google Patents

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.

Conventional technology

  Paper cups are widely used not only for instant foods and snacks, but also 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 the contents are put into a paper cup and heated and cooked in a microwave oven, there is a problem that a so-called yarn twist portion formed by extending the lower end portion of the body member of the paper cup may be burnt. In particular, since the amount of heat generated at the joint where paper overlaps is large (the amount of heat released does not increase), it is considered that heat is easily stored and scorching is likely to occur. On the other hand, in the portion in contact with the contents, the generated heat is taken away by the contents, so that it is difficult for charring to occur.

JP 2003-192043 A

  Patent Document 1 discloses a technique for forming an annular leg by curling the threaded portion inward, based on the idea that, according to an experiment, if the height of the thread twisting in the paper cup is reduced, the occurrence of scorching can be prevented. Have been described.

  However, the thread twist in the paper cup is formed by bending the peripheral portion of the bottom member downward and joining the bent portion and the lower end portion of the body member. It is difficult to curl.

  An object of the present invention is to provide a paper cup having a flat / bottom shape that is easy to manufacture and has a feature that it is difficult to burn even when used in a microwave oven.

  A microwave oven paper cup according to the present invention comprises a barrel member and a bottom member, the peripheral edge of the bottom member is raised, the lower end of the barrel member is folded outward, and the outer surface of the folded portion is It is joined so that the rising part of the peripheral part of a bottom member may cover.

  According to the present invention, since the joining portion where the paper overlaps, such as the joining portion of the body member and the bottom member, is in contact with the contents (flat bottom type), it is difficult to burn even when heated in a microwave oven. It has become. Since the lower end portion of the body member is folded outward and joined to the rising portion of the bottom member, processing is relatively easy. Since the end of the paper member, that is, the folded part of the body member and the rising part of the bottom member are all outside the paper cup, the end surface treatment is not necessarily required even when liquid or the like is put into the paper cup. .

  In one embodiment, the bottom member is formed with a support leg made of a protrusion projecting outward.

  Since the bottom member is formed with support legs made of protrusions projecting outward, the paper cup is stably supported by the support legs and the stability of the paper cup is increased. Since the support leg (protrusion) is also in contact with the contents, it is difficult to cause scorching.

  In another embodiment, the outer cylinder member is covered and fixed so as to provide a heat insulating space outside the body member.

  Since the outer cylinder member is covered and fixed so as to provide a heat insulating space layer on the outer side of the body member, the heat insulating property is enhanced. Since the heat insulation space is provided, the outer cylinder member itself is also difficult to burn.

The front view which fractures | ruptures a part of microwave oven paper cup by an Example, and shows it (as a cross-sectional end view). The front view which fractures | ruptures a part of microwave oven paper cup by a modification, and shows it (as a cross-sectional end view). Furthermore, the front view which fractures | ruptures and shows a part of microwave oven paper cup by another modification (as a cross-sectional end view). The front view which fractures | ruptures and shows a part of microwave paper cup by another Example (as a cross-sectional end view). Furthermore, the front view which fractures | ruptures a part of microwave oven paper cup by another Example, and shows it (as a cross-sectional end view). Furthermore, the front view which fractures | ruptures a part of microwave oven paper cup by another Example, and shows it (as a cross-sectional end view). Furthermore, the front view which fractures | ruptures a part of microwave oven paper cup by another Example, and shows it (as a cross-sectional end view).

  FIG. 1 is a front view showing a part of a microwave oven paper cup according to an embodiment of the present invention.

  The microwave oven paper cup 10 includes a body member 11 and a bottom member 12. The body member 11 has a cylindrical shape with a large upper diameter and a smaller diameter as it goes down, and the upper end portion is wound outward to form a so-called curl (top curl portion) 11A. The lower end portion of the body member 11 is folded outward (this folded portion is indicated by reference numeral 11B). Further, the peripheral edge of the bottom member 12 is raised (this raised portion is indicated by reference numeral 12A). Then, the rising portion 12A of the bottom member 12 covers the outer surface of the folded portion 11B of the body member 11, and these are joined (fixed by adhesion, welding, etc.). The lower end of the body member 11, that is, the turning point (part) preferably contacts the inner surface of the bottom member 12. The folding of the lower end portion of the body member 11 to the outside may be performed by curling this portion outward so as to crush the curl when joining the rising portion 12A of the bottom member 12 and joining the rising portion 12A. The inner surface of the folded portion 11B of the trunk member 11 and the outer surface of the lower end portion (the portion where the folded portion 11B contacts) of the trunk member 11 may be joined (adhered or welded) or simply overlapped.

  If a film made of a thermoplastic resin is formed on the inner surface of the barrel member 11 and the inner surface of the bottom member 12, the outer surface of the folded portion 11B of the barrel member 11 and the inner surface of the rising portion 12A of the bottom member 12 are joined. Can be realized by thermal welding of these resins. In this case, the paper cup can accommodate the liquid contents. Further, by forming a thermoplastic resin film on the outer surface of the barrel member 11, the folded portion 11B of the barrel member 11 and the corresponding lower outer surface of the barrel member 11 can also be joined by thermal welding with resin. .

  In the paper cup 10 shown in FIG. 1, the diameter of the body member 11 continuously changes from the upper end to the lower end. On the other hand, in the paper cup 10A shown in FIG. 2, the diameter of the lower portion of the body member 11, that is, the portion where the folded portion 11B is folded (indicated by reference numeral 11C) is constant and perpendicular to the bottom surface. It has become. Other configurations are the same as those shown in FIG. In the description of the embodiments below, the same structure as that already described is given the same reference numeral to avoid redundant description.

  In the paper cup 10B shown in FIG. 3, the height of the rising portion 12A of the bottom member 12 is formed higher than the height of the folded portion 11B of the trunk member 11, and the upper portion (indicated by reference numeral 12A1) of the trunk member 11 Bonded directly to the outer surface.

  Needless to say, the bottom structure shown in FIGS. 2 and 3 can be applied to the other embodiments shown in FIGS.

  The above-mentioned paper cups 10, 10A, 10B (and also in the paper cups 10C to 10F described later) have a structure (flat / bottom type) in which the joining portion where the paper overlaps such as the joining portion between the body member and the bottom member is in contact with the contents. Therefore, it is difficult to burn even when heated in a microwave oven. In addition, it is a flat bottom type, so it is stable and independent. Since the lower end portion of the body member is folded (curled) outward and joined to the rising portion of the bottom member, the processing is relatively easy. Since the end portion of the paper member, that is, the folded portion 11B of the body member 11 and the rising portion 12A of the bottom member 12 are all outside the paper cup, the end face treatment is always required even when liquid or the like is put into the paper cup. Not.

  FIG. 4 shows a paper cup 10C according to another embodiment. In the paper cup 10C, a support leg portion 13 is formed on the bottom member 12 of a protrusion that is deformed so as to project the bottom member itself outward. The shape of the support leg 13 when the paper cup is viewed from the lower surface can take various forms. For example, when viewed from the bottom, an annular projection, a square (square) annular projection (preferably rounded corners), these annular projections are separated into several, and a plurality of independent linear (linear, Arc-shaped projections, multiple (three or more) dot-shaped projections, combinations thereof, and the like.

  The paper cup 10C becomes more independent and more stable due to the support legs formed by the protrusions formed so as to project outward from the bottom member, and the stability is increased. In addition, since the support leg (protrusion) is also in contact with the contents, it is difficult to cause scorching.

  FIG. 5 shows still another embodiment, and shows a paper cup with enhanced heat insulation effect.

  A microwave oven paper cup 10D shown in FIG. 5 includes an outer cylinder member (sleeve) 14 that covers the paper cup 10C shown in FIG. The outer cylinder member 14 is a cylindrical body having an upper diameter slightly larger than the lower part, and a lower end portion is wound inward to form a curl 14A. The barrel member 11 having the bottom member 12 is completely inserted (inserted) into the outer cylinder member 14 from above. The upper end of the outer cylinder member 14 enters the gap inside the curl 11A of the body member 11, and the curl 14A at the lower end of the outer cylinder member 14 is the outer peripheral portion of the bottom member 12 (the angle at which the rising portion 12A is bent). Part) from diagonally below (or from below) (from outside) to prevent the barrel member 11 from falling off the outer cylinder member 14 and between the outer surface of the barrel member 11 and the inner surface of the outer cylinder member 14. An insulating space (gap) is formed in The outer cylinder member 14 is fixed to the body member 11 with an adhesive. For example, at a location where the gap between the outer cylinder member 14 and the body member 11 near the upper end portion is narrow, the outer surface of the body member 11 and the inner surface of the outer cylinder member 14 are fixed (adhered) at several locations. To do. The vicinity of the upper end of the outer cylinder member 14 and the inside of the curl 11A may be bonded, or the curl 14A of the outer cylinder member 14 and the outer peripheral portion of the bottom member 12 may be bonded. The protrusion of the support leg 13 formed on the bottom member 12 protrudes outward (downward) from the curl 14A (lower end) of the outer cylinder member 14. The curl 14A of the outer cylinder member 14 is projected outward (downward) from the projection of the support leg 13, and the paper cup 10D is supported by the outer cylinder member 14 in the same manner as the paper cup 10F of the embodiment of FIG. May be.

  The lower curl 14A is not roundly curved but may be flatly curved, extremely pressed by pressing the curl from both sides, or may be folded and overlapped at the lower end of the outer cylinder member 14. The lower end of the outer cylinder member 14 is preferably in contact with the bottom of the bottom member 12 or the trunk member 11.

  Since a heat insulating space (layer) is formed between the body member 11 and the outer cylinder member 14, the paper cup 10D has a heat insulating effect (heat insulation effect). The outer tube member may be formed of corrugated paper (corrugated paper) that has been corrugated (fluted) or foamed paper that has been foamed (space formed by corrugation, small voids in the foamed resin) Are each insulated space). In these cases, it is possible to fix the outer cylinder member to the body member by adhesion, and formation of a curl or the like at the lower end is not always necessary.

  FIG. 6 shows still another embodiment. In the paper cup 10E, the support leg 13 is not provided. Further, the curl 14 </ b> A of the outer cylinder member 14 abuts against the rising portion 12 </ b> A of the bottom member 12 from the side.

  FIG. 7 shows still another embodiment. Compared with the paper cup 10D shown in FIG. 5, the paper cup 10F is not formed with the support legs 13, and the paper cup 10F is supported by the curl 14A of the outer cylinder member 14 so as to be self-supporting.

  In the above drawings, the cross-sections of the body member 11, the bottom member 12, and the outer cylinder member 14 are drawn slightly exaggerated and thick in order to express the details in an easy-to-understand manner. Please take into account the fact that the width of the 12 start-up parts 12A is drawn slightly larger.

  It is preferable that at least the body member 11 and the bottom member 12 of the microwave oven paper cup have paper as a main strength material and have a thermoplastic resin layer as the innermost layer as described above. The innermost thermoplastic resin functions to protect the contents, and in particular, does not leak even when liquid substances are added. Specific examples of the thermoplastic resin include polyethylene (PE), polypropylene (PP), polyester, and ethylene / vinyl acetate copolymer. The thickness is preferably in the range of 15-60 μm. These thermoplastic resins are formed in the innermost layer by extrusion or lamination. By forming these resin films (films) in the innermost layer, there is an advantage that bonding by heat sealing becomes possible. That is, when the body member 11 is formed by bonding the folded portion 11B of the body member 11 and the rising portion 12A of the bottom member 12 or by forming a blank material into a cylindrical shape and bonding the both ends thereof. Adhesion of both ends can be performed by thermal welding of these thermoplastic resins. Polyethylene terephthalate (PET) resin can be used as the innermost layer resin. In this case, it is preferable to use an adhesive for bonding.

  The outer cylinder member 14 is preferably provided with the above-described various resin layers on the outermost layer.

  Of course, the body member 11, the bottom member 12, and the outer cylinder member 14 may have a layer structure of three or more layers, and a resin film may be formed on both surfaces. Examples thereof include polyethylene resin layer / paper layer / polyethylene resin layer, foamed polyethylene resin layer / paper layer / polyethylene resin layer, polypropylene resin layer / paper layer / polypropylene resin layer, and the like.

As the paper used as the main strength material, it is preferable to use cup cardboard having good suitability for paper cup molding. The basis weight is not particularly limited, but is preferably in the range of 150 to 350 g / m ^{2 in view} of paper cup molding suitability.

As an example, the material of the body member 11 is composed of a low-density PE 40 μm / cup cardboard 280 g / m ² / a low-density PE and high-density PE mixed resin 25 μm from the outer surface. A material having a constitution of low density PE 30 μm / cup cardboard 220 g / m ² / low density PE 25 μm from the outer surface can be mentioned.

  Needless to say, the above-mentioned paper cup is covered with a lid as necessary, or the lid is joined (adhered or thermally welded) to the curl 11A of the body member 11.

10, 10A, 10B, 10C, 10D, 10E, 10F Microwave oven paper cup
11 Torso
11B Folding part
12 Bottom member
12A start-up part
13 Support legs (protrusions)
14 Outer cylinder member

Claims (3)

It consists of a body member and a bottom member,
The peripheral part of the bottom member is raised, the lower end part of the body member is folded outward, the inner surface of the folded part and the outer surface of the body member are in contact, and the outer surface of the folded part and the peripheral part of the bottom member Is joined to the inner surface of
Microwave paper cup.   The microwave oven paper cup according to claim 1, wherein a support leg portion including a protrusion projecting outward is formed on the bottom member.   The microwave oven paper cup according to claim 1 or 2, wherein an outer tube member is covered and fixed so as to provide a heat insulating space outside the body member.

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