JP6419412B2 - 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 11-11541 A

  Patent Document 1 describes a microwave oven paper cup that is composed of a body member and a bottom member, the lower end portion of the body member is bent inward, and is joined so as to cover the outer surface of the peripheral edge portion of the bottom member. Yes.

  Moreover, the aspect by which the peripheral part of the bottom member is return | folded by the outer surface and the said trunk | drum member lower end part is joined to this return | turnback part is also described.

  The microwave oven paper cup described in Patent Document 1 is formed by extending the lower end portion of the body member, so-called no twisting, and the lower end portion of the body member is bent and joined to the outer surface of the peripheral portion of the bottom surface portion. As a result, a flat bottom shape is formed, and all parts near the bottom of the paper cup are in contact with the contents.

  However, since the flat bottom of Patent Document 1 is formed by bending the lower end portion of the body member and joining the outer surface of the peripheral portion of the bottom surface portion, sufficient stability is not always obtained. There was a need to improve its independence.

  Patent Document 1 also describes a mode in which the center part of the bottom member protrudes inward, that is, deforms in a concave shape when viewed from the outside in order to stabilize the bottom part of the paper cup. If it is low, the center part of the bottom member may be deformed in a convex direction when viewed from the outside due to the weight of the contents, and the concave shape when viewed from the outside may not be maintained.

  An object of the present invention is to improve the stability of a paper cup having a flat bottom shape that has the feature of being hard to burn even when used in a microwave oven.

  Another object of the present invention is to improve the heat insulation of the paper cup.

  A microwave oven paper cup according to the present invention comprises a barrel member, a bottom member, and an outer cylinder member, and the lower end portion of the barrel member is bent inward and joined so as to cover the outer surface of the peripheral portion of the bottom member. The outer cylinder member is placed on and fixed to the outer side of the body member, and the lower end of the outer cylinder member protrudes outward from the bent lower end part of the body member joined to the peripheral edge of the bottom member. It is what.

  The microwave oven paper cup according to the present invention has a structure 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. ing. Further, the lower end of the outer cylinder member that is covered and fixed to the outer side of the barrel member protrudes outward (downward) from the bent lower end portion of the barrel member that is joined to the peripheral edge of the bottom member. The microwave oven paper cup stably stands by the lower end of the outer cylinder member. This increases the stability of the paper cup. Since the heat insulation space can be formed on the outer side of the body member by the outer cylinder member, it is difficult for the outer cylinder member, particularly the lower end portion thereof to be burned, and the heat insulation of the paper cup can be improved.

  In one embodiment according to the present invention, an inward turn is formed at the lower end of the outer cylinder member. The turning can be realized by such a manner that the lower end portion of the outer cylinder member is curled inward or the lower end portion is folded inward. Microwave oven paper cups are more stable.

  In a preferred embodiment, a thermoplastic resin film is formed on the inner surfaces of the trunk member and the bottom member. Thereby, it becomes suitable for contents such as liquid, and the joining of the lower end bent portion of the body member and the peripheral portion of the bottom member can be achieved by heat welding with resin.

  In a preferred embodiment, the peripheral edge portion of the bottom member is folded back to the outer surface, and the body member lower end bent portion is joined to the folded portion. When the resin film is formed on the inner surfaces of the bottom member and the body member, it is possible to put the liquid contents without performing the end surface treatment on the outer peripheral end surface of the bottom member. In still another embodiment, the folded portion formed by folding the peripheral edge of the bottom member to the outer surface and folding the tip of the lower end bent to the inside of the body member to the inner side. Between the bottom member and the folded portion of the bottom member, and the body member lower end bent portion excluding the folded tip portion is joined to the folded portion of the bottom member.

It is a front view which fractures | ruptures a part of microwave oven paper cup by an Example (as a cross-sectional end view), and shows it. It is a front view which fractures | ruptures a part of microwave oven paper cup by another Example, and shows it (as a cross-sectional end view). It is an expanded sectional view of the paper cup bottom part which shows the modification of the junction part of a trunk | drum member and a bottom member. It is an expanded sectional view of the paper cup bottom part which shows the other modification of the junction part of a trunk | drum member and a bottom member.

  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, a bottom member 12, and an outer cylinder member (sleeve) 13. 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 bent at a substantially right angle inside (the bent portion is indicated by 11B). The bottom member 12 is circular and fits tightly within the lower end portion of the barrel member 11, and is joined so that the bent portion 11B of the barrel member 11 covers the outer surface of the peripheral edge portion 12A (for example, heat from a thermoplastic resin described later) Adhesion (thermal welding) or adhesive bonding). Depending on the contents, end surface treatment is performed on the peripheral end surface of the bottom member 12 as necessary. End face treatment is a process that covers the end face with resin so that liquid does not penetrate into the end face of the paper member whose surface (at least one face) is covered with a resin film (film). .

  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 wound inward to form a curl 13A. The barrel 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 the gap inside the curl 11A of the body member 11, and the curl 13A at the lower end of the outer cylinder member 13 is the lower end of the outer periphery of the body member 11 (the corner where the bent portion 11B is bent). ) Obliquely from below (or from below) (from the outside) to prevent the barrel member 11 from falling off the outer cylinder member 13 and between the outer surface of the barrel member 11 and the inner surface of the outer cylinder member 13. A heat insulating space (gap) is formed. The outer cylinder member 13 is fixed to the body member 11 with an adhesive. For example, in a place where the gap between the outer cylinder member 13 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 13 are fixed (adhered) at several locations with an adhesive. To do. The vicinity of the upper end of the outer cylinder member 13 and the inside of the curl 11A may be bonded, or the curl 13A of the outer cylinder member 13 and the lower end of the outer periphery of the body member 11 may be bonded. The curl 13A (lower end) of the outer cylinder member 13 protrudes outward (downward) from the body member bent portion 11B joined to the peripheral edge portion 12A of the bottom member 12. The lower end portion of the outer cylinder member may not be continuous in an annular shape but may be separated into a plurality of portions like legs (there is a gap between the plurality of portions).

  The lower curl 13A is not roundly curved but may be flattened, extremely curled by pressing the curl from both sides, or the lower end of the outer cylinder member 13 folded and overlapped. The lower end of the outer cylinder member 13 is preferably in contact with the lower portion of the body member 11.

  Since a heat insulating space (layer) is formed between the body member 11 and the outer cylinder member 13, the paper cup 10 has a heat insulating effect (heat insulating 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. 2 shows another embodiment. In FIG. 2, the same components as those shown in FIG.

  In the microwave oven paper cup 10A shown in FIG. 2, the peripheral edge portion of the bottom member 12 is folded back to the outer surface (outside) (the folded annular portion is indicated by reference numeral 12B), and the body member 11 is formed on the outer surface of the folded portion 12B. Are bent (heat-welded). The lower end portion of the outer cylinder member 13, that is, the curl 13 </ b> A protrudes outward (downward) from the bent portion 11 </ b> B of the body member 11. As will be described later, when the thermoplastic resin film is formed on at least the innermost layer of the body member 11 and the bottom member 12, the microwave oven paper cup 10 </ b> A performs the end surface treatment on the outer peripheral end surface of the bottom member 12. The bent portion 11B of the body member 11 and the folded portion 12B of the bottom member 12 can be joined by thermal welding of the thermoplastic resin film. If a thermoplastic resin film is formed on both surfaces of the bottom member 12, the folded portion 12B and the outer surface of the bottom member 12 can be joined by thermal welding of this resin.

  FIG. 3 shows a modification of joining the lower end portion of the body member 11 and the peripheral portion of the bottom member 12 shown in FIG. The bent portion 11B at the lower end of the body member 11 extends from the folded portion 12B of the bottom member 12 (toward the center of the paper cup), and this extended portion (indicated by reference numeral 11B1) is joined to the outer surface of the bottom member 12 (Heat welding, bonding) (fixed).

  FIG. 4 shows still another modification example, which has a slightly complicated structure. There is a folded portion 11C at the tip of the bent portion 11B of the body member 11, and the folded portion 11C is sandwiched between the outer peripheral portion 12C and the folded portion 12B of the bottom member 12. These portions 12C, 11C, 12B, and 11B sandwiched between each other are preferably joined (adhered, thermally welded) (fixed) to each other at least partially, preferably entirely. 3 and 4, the lower end of the curl 13 </ b> A of the outer cylinder member 13 protrudes outward (downward) from the bent portion 11 </ b> B of the body member 11.

  In the modification of FIG. 4, it can be said that the bent portion 11B of the trunk member 11 is joined so as to cover the outer surface of the folded portion 12B of the bottom member 12, but the folded portion 11C of the trunk member 11 is the outer peripheral portion of the bottom portion. It may be said that they are joined so as to cover the outer surface of 12C. For thermal welding of the body member 11 and the bottom member 12, a thermoplastic resin film may be formed on the inner surface of the body member 11 and the inner surface of the bottom member 12, but the thermoplastic resin is further formed on both surfaces of the bottom member 12. More preferably, a film is formed.

  In the above drawings, the cross-sections of the trunk member 11, the bottom member 12, and the outer cylinder member 13 are drawn slightly exaggerated and thickly so that the fine parts can be easily understood, and the width of the bent portion 11B etc. of the trunk member 11 is shown. I would like you to consider the points that are drawn slightly larger when you look at the drawings.

  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 in the innermost layer and / or outermost 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 and / or the outermost layer, there is an advantage that bonding by heat sealing becomes possible. That is, the peripheral portion 12A of the bottom member 12 or the folded annular portion (peripheral portion) 12B is bonded to the bent portion 11B of the barrel member 11, the outer peripheral portion 12C of the bottom portion, the folded portion 12B of the bottom member 12 and the trunk member 11 Adhesion between the folded portion 11C, the bent portion 11B, etc., and adhesion of both ends when forming the body member 11 by forming one blank material into a cylindrical shape and bonding the both ends together, etc. This can be done by thermal welding of the resin. 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 13 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 13 may have a three-layer structure or more, 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. A cup cardboard 270 g / m ² can be used as the material of the outer cylinder member 13.

  As described above, the above-described microwave oven paper cups 10 and 10A have a structure in which the joining portion where the paper overlaps such as the adhesion portion between the body member 11 and the bottom member 12 is in contact with the contents. It is hard to burn. Further, since the lower end portion (curl 13A) of the outer cylinder member 13 protrudes from the lower end bent portion 11B of the body member joined to the peripheral edge portion of the bottom member, the lower end portion (curl 13A) of the outer cylinder member 13 is stable. To become independent. This increases the stability of the paper cup. Since there is a heat insulating space in contact with or inside the outer cylinder member 13, and there is also a space inside the curl 13A, the outer cylinder member itself is also difficult to burn. 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 microwave paper cup
11 Torso
11B bent part
11C Folded part (bent part)
12 Bottom member
12A, 12B peripheral edge
13 Outer cylinder member

Claims (4)

It is composed of a trunk member, a bottom member, and an outer cylinder member,
A lower end portion of the body member is bent at a substantially right angle inside, and the body member lower end bent portion is joined so as to cover an outer surface of a peripheral portion of the flat bottom member;
The outer cylinder member is placed on the outer side of the body member, and the lower end portion of the outer cylinder member is fixed in contact with the lower end of the outer periphery of the body member, and the lower end of the outer cylinder member is attached to the peripheral edge portion of the bottom member. Projecting outward from the lower bent portion of the body member to be joined,
Microwave paper cup with flat bottom shape.   The microwave oven paper cup according to claim 1, wherein a peripheral edge portion of the bottom member is folded back to an outer surface, and the body member lower end bent portion is joined to the folded portion. The microwave oven paper cup according to claim 1 or 2 , wherein a heat insulating space is formed outside the body member by the outer cylinder member. The microwave oven paper according to any one of claims 1 to 3 , wherein a return portion toward the inside is formed at a lower end of the outer cylinder member, and the return portion hits an outer peripheral lower end of the body member from the outside. cup.

Images