JP6232740B2 - Insulated paper container - Google Patents

Description

  The present invention relates to an insulated paper container.

  Insulated paper containers are generally composed of a container body having a body and a bottom, and an exterior sleeve attached to the outside of the container body. A space is provided between the body and the exterior sleeve of the container body. Heat insulation is provided by the air gap. See, for example, US Pat.

JP 2005-82165 A

  Since there is a gap between the body of the container body and the outer sleeve, the peripheral wall of the container is necessarily thick. Although the container is formed so that the diameter increases toward the top, the thicker the peripheral wall, the worse the stackability. That is, when another container is put in the container, its height increases and it becomes bulky. From the viewpoint of transporting and storing the paper container, it is preferable that the paper containers are not so high and bulky even if they are stacked.

  The present invention provides an insulating paper container having a good stacking property, that is, an insulating paper container having a structure in which the height can be kept as low as possible even when a plurality of paper containers are stacked.

  Another object of the present invention is to provide a heat-insulating paper container having a structure that can be easily pulled out even when the stacked paper containers are taken from above.

  The heat insulating paper container according to the present invention has a trunk portion that is generally increased in diameter from the lower portion toward the upper portion (has an overall decrease in diameter from the upper portion toward the lower portion) and a bottom portion that closes the bottom. A container body, and an exterior sleeve attached to the outside of the body of the container body.

  The container main body is curled outward (upper curl (part)) at the upper end of the body part, and the body part is provided with two steps (upper step (part), lower step (part)) on the upper and lower sides. Each step is formed so that the diameter is larger at the upper side of the step than the lower side (the diameter is smaller at the lower side than the upper side).

  Between the lower part of the body part (lower end or thread end) and the lower step, between the lower step and the upper step, and between the upper step and the upper part of the body (upper end) (upper curl) The diameter increases continuously (preferably linearly) from bottom to top (diameter continuously decreases from top to bottom) (tapered).

  The outer sleeve is curled inwardly at the lower end (lower curl), touches the body (preferably bonded) above the upper step, and the lower curl touches the outer surface of the shell below the lower step. ing. Accordingly, a gap is provided between the outer surface of the trunk portion and the inner surface of the outer sleeve at least between the lower curl and the lower step and between the lower step and the upper step. This void maintains heat insulation.

  According to the present invention, a paper container having heat insulation is realized as described above. When another insulating paper container is stacked on this insulating paper container, the lower curl of the outer sleeve of the upper paper container gets on the lower step of the lower paper container. Since a lower step is provided, the diameter above this lower step is slightly larger, and the upper paper container enters up to the position of this lower step, so even if multiple paper containers are stacked, The stackability is good without being too bulky.

  In addition, the diameter of the body increases continuously from the lower part of the body part to the lower part, from the lower part to the upper part, and from the upper part to the upper part of the body part. (Of course, the diameter of the outer sleeve continuously changes so as to increase as the diameter increases), and even when stacked, the upper paper container can be easily taken out (easily pulled out).

  In particular, the above structure forms a generally tapered body (that is, a larger diameter in the upper part) in the manufacturing process of the heat-insulating paper container, and each of the stepped parts has a diameter on the upper part of the stepped part. When it is formed by stretching in a direction in which the diameter increases (the lower side may be squeezed in a direction in which the diameter decreases), it is only necessary to stretch a part of the body with a taper shape. Elongation is easier to process and finishes better) and is easier to process.

It is sectional drawing by the diagram of the heat insulation paper container of one Example. It is sectional drawing which shows a mode that the heat insulation paper container was piled up. It is a partial expanded sectional view (end view) of the heat insulation paper container of FIG. It is sectional drawing by the diagram of the heat insulation paper container of another Example. It is sectional drawing which shows a mode that the heat insulation paper container was piled up. FIG. 5 is an enlarged cross-sectional view (end view) of a part of the heat insulating paper container of FIG. 4.

  FIG. 1 is a cross-sectional view of a heat-insulating paper container according to an embodiment, and is drawn as a diagram. FIG. 2 shows a state in which another heat insulating paper container (shown by a chain line) is placed and stacked in one heat insulating paper container. FIG. 3 is an enlarged sectional end view showing a part of the heat insulating paper container shown in FIG.

  With reference to these drawings, the heat insulating paper container 1 includes a container body 10 and an outer sleeve 20.

  The container body 10 includes a body 11 and a bottom 15. The body 11 has a cylindrical shape with a large diameter at the top and a smaller diameter as it goes down as a whole (the diameter becomes larger as it goes up). ), Upper curl (part)) 19. The bottom portion 15 is circular, and the periphery is bent downward (the bent portion is indicated by 15A). Are joined (for example, thermal bonding (thermal welding) using a thermoplastic resin, which will be described later, or bonding using an adhesive). This joined portion forms what is called a thread tail of the paper container 1. It is also possible to reinforce the yarn bottom by extending the lower end portion of the body portion 11 and folding it back and joining the folded portion along the inner surface of the bent portion 15A. 1 and 2, there is a gap between the bent portion 15A of the bottom portion 15 and the inner surface of the lower portion of the body portion 11. This is because FIGS. Since the structure is difficult to understand, it is only drawn so that there is a gap. From FIG. 3, it can be seen that they are closely joined to form a thread tail (FIGS. 4 and 5). The same). The gap between the upper portion 11A of the body 11 and the outer sleeve 20 should be understood in the same manner.

  The body 11 is generally manufactured by winding a sheet of paper blank into a cylindrical shape whose diameter changes linearly and joining both sides, but it may be of other structures. Since various structures, such as those that do not form a thread end, are already known as the structure for joining the body portion 11 and the bottom portion 15, they can also be adopted.

  The upper curl 19 of the body 11 gives rigidity to the body 11, glues a lid, inserts the upper end of the outer sleeve 20 as will be described later, and makes it easier to drink when the contents of the paper container are beverage liquid There are actions and effects such as.

  Further, the body part 11 is formed with steps (step parts) 12 and 13 in two upper and lower stages. Each of the steps 12, 13 is formed over the entire circumference of the body, and is formed so that the diameter of the upper side is larger than that of the lower side. Then, the portion 11A between the upper end (upper curl 19) and the upper step 12 of the body 11, the portion 11B between the upper step 12 and the lower step 13, and the lower step 13 and the lower end (yarn bottom) The portion 11C has a shape in which the diameter of the body portion continuously decreases (in this embodiment, linearly) from the top to the bottom, that is, a tapered shape (in other words, from the bottom). A shape whose diameter increases continuously upward). The step portions 12 and 13 are also bent with a slight inclination rather than being bent at substantially right angles to the respective portions 11A, 11B and 11C.

  As will be described later, the upper step 12 is for forming a heat insulating gap 30 between the portions 11B and 11C of the body 11 and the outer sleeve 20 (to ensure the gap). The lower step 13 is for the lower curl 29 of the outer sleeve of the paper container 1a to get on the step (step) 13 when another paper container 1a is put in the paper container 1 and stacked (see FIG. 2), that is, to achieve a good stacking property and easy removal. The portion 11B of the body 11 and the exterior sleeve 20 are substantially parallel (as viewed from the cross section) (it is more preferable that the exterior sleeve 20 stands in a direction closer to the bottom surface). Contributes to easy removal.

  The outer sleeve 20 is mounted on the outer side of the trunk portion 11 of the container main body 10, and an upper end 20A of the outer sleeve 20 enters a gap between the upper curl 19 of the trunk portion 11 and the upper outer surface of the portion 11A of the trunk portion 11. The lower end of the outer sleeve 20 is curled inward (lower curl (part) 29). The upper portion of the outer sleeve 20 is in contact with the outer surface of the upper portion 11A of the body portion (preferably bonded at a part of this portion), and the lower curl 29 is in contact with the lower outer surface (yarn bottom outer surface) of the body portion 11. The lower curl 29 may be bonded to the body 11. Therefore, the outer sleeve 20 is in contact with the outer surface of the barrel 11 at the upper part (portion 11A) of the container main body 10, and is separated from the outer surface of the barrel 11 at the position of the upper step 12, and at the remote portion, the barrel 11 A heat-insulating gap 30 is provided between the outer surface (the outer surfaces of the portions 11B and 11C) and the inner surface of the exterior sleeve 20.

  4 to 6 show other embodiments, and these drawings correspond to FIGS. 1 to 3, respectively. The same components as those in the previous embodiment are denoted by the same reference numerals to avoid redundant description.

  In the heat insulating paper container 1A of this embodiment, the position of the lower step portion 13 is formed slightly above the previous embodiment. The length (height) of the outer sleeve 20 is also shorter than that of the previous embodiment, and the lower curl 29 is in contact with the lower portion 11C of the trunk portion 11. However, also in this embodiment, between the lower curl 29 and the lower step 13 and between the lower step 13 and the upper step 12, there is a heat insulating gap 30 between the outer surface of the trunk portion 20 and the inner surface of the outer sleeve 20. It is the same that is provided.

  As described above, in any of the embodiments, the paper containers 1 and 1A having heat insulation are realized. When the other insulating paper containers 1a and 1Aa are stacked on the insulating paper containers 1 and 1A (FIGS. 2 and 5), the lower curl 29 of the outer sleeve 20 of the upper paper containers 1a and 1Aa is the lower paper container 1 , Get on the lower step 13 of 1A. Since the lower step 13 is provided, the diameter of the upper portion of the lower step 13 is slightly large, and the upper paper containers 1a and 1Aa penetrate deeply to the position of the lower step 13, so that a plurality of paper containers are stacked. However, the overall height can be kept low, and the stackability is good without being too bulky.

  Further, in the portion 11C between the lower end of the trunk portion 11 and the lower step 13, the portion 11B between the lower step 13 and the upper step 12, and the portion 11A between the upper step 12 and the upper end of the trunk portion, Since the diameter of 11 is continuously increased as it goes upward (of course, the diameter of the outer sleeve 20 is continuously changed so as to increase, and the portions 11C and 11B of the body 11 The upper paper containers 1a and 1Aa can be easily taken out (easily pulled out) even if they are stacked.

  In particular, the above structure forms a generally tapered body (that is, a larger diameter in the upper part) in the manufacturing process of the heat-insulating paper container, and each of the stepped parts has a diameter on the upper part of the stepped part. When it is formed by stretching in the direction in which the diameter increases (the lower side may be squeezed in the direction in which the diameter decreases), it is only necessary to stretch the part of the body in the radial direction while maintaining a tapered shape. (It is easier to process than to shrink, and it is easier to process, and it finishes better.)

  The container main body 10, that is, the trunk portion 11 and the bottom portion 15 is preferably made of paper as a main strength material and has a thermoplastic resin layer in the innermost layer and / or outermost layer. 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. For example, by using a thermoplastic resin for the inner surface of the body part 11 and the inner surface of the bottom part 15, the bent part 15 A of the bottom part 15 is bonded to the inner surface of the body part 11 (formation of the thread end), and one blank is formed into a cylindrical shape. When the body 11 is formed by bonding the both ends together, the both ends can be bonded 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 sleeve 20 is preferably provided with the above-described various resin layers as the outermost layer.

  Of course, the body 11, the bottom 15, and the outer sleeve 20 may each have a three-layer structure, 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 container molding. The basis weight is not particularly limited, but is more preferably in the range of 150 to 350 g / m ^{2 in view} of paper container moldability.

1,1A, 1a, 1Aa Insulated paper container
10 Container body
11 Torso
11A, 11B, 11C Body part
12 Upper step
13 Lower step
15 Bottom
19 Upper curl
20 Exterior sleeve
20A Upper end of outer sleeve
29 Lower curl
30 Air gap for thermal insulation

Claims (3)

A container main body having a barrel portion whose diameter increases from the bottom to the upper portion and a bottom portion for closing the bottom, and an outer sleeve attached to the outside of the barrel portion of the container main body,
The container body is curled outward at the upper end of the barrel, and is provided with two steps on the barrel.
Each step has a larger diameter at the upper side of the step than the lower side,
The diameter of the body is continuously increased from the bottom to the top, from the bottom to the bottom of the body, from the bottom to the top, and from the top to the top of the body. The shape
The outer sleeve continuously changes so that its diameter increases as it goes upward, and its lower end is curled inward, is in contact with the trunk portion above the upper step, and is lower than the lower step. In the lower part, the lower curl is in contact with the outer surface of the trunk,
A gap is provided between the outer surface of the body and the inner surface of the outer sleeve at least between the lower curl and the lower step and between the lower step and the upper step, and the body is between the lower step and the upper step. are substantially parallel to the outer sleeve in the portion,
Insulated paper container.   The heat insulating paper container according to claim 1, wherein the outer sleeve is bonded to the body portion above the upper step.   The heat insulating paper container according to claim 1 or 2, wherein an upper end of the outer sleeve is in a gap between an upper curl of the trunk portion and an outer surface of the trunk portion.

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