JP2021050008A - Heat insulation double container - Google Patents

Abstract

To provide a heat insulation double container which has a good shape retention property of a lower side curl part, in which return of a curl is small, and in which the quality is stable, regarding the heat insulation double container comprising a container body and a paper exterior sleeve, and more specifically, regarding a shape of the lower side curl part of exterior sleeve.SOLUTION: In a heat insulation container, the area of a region A which is a region of a lower side curl margin 63 corresponding to a lower side curl part of an exterior sleeve 30 and in which an inside trunk pasting margin 61 and an outside trunk pasting margin 62 are overlapped with each other is below 50% of the area of a region in which the width of a trunk pasting part 32 and the region of the lower side curl margin 63 are overlapped with each other. A distance between a lowermost end position B of the region A where the inside trunk pasting margin 61 and the outside trunk pasting margin 62 are overlapped with each other and an extension line of a lower end of a blank plate of the exterior sleeve 30 is equal to or less than 1/3 of the width in the vertical direction of the region of the lower side curl margin 63.SELECTED DRAWING: Figure 3

Description

The present invention relates to a heat insulating double container including a container body and an outer sleeve attached to the outer periphery of the container body.

As a heat-insulating double container suitable for putting hot water or the like, a heat-insulating double container composed of a container body and a paper outer sleeve attached to the outer circumference of the container body is known. The container body of this container is a paper container such as a paper cup, a synthetic resin container, etc., and is provided with an outer sleeve that is adhered to the container body, and an inwardly downward curl portion is provided at the lower end of the outer sleeve. By being provided, a space is provided between the container body and the outer sleeve, and the container is provided with heat insulating properties.

However, in such a container, since the outer sleeve is gripped by hand to lift the container, it is necessary to give the outer sleeve a certain degree of strength, and a considerably thick paper or the like is used as the material of the outer sleeve. There must be. Therefore, in order to facilitate the formation of the inwardly downward curl portion that is the lower end of the body pasting portion, which is a body pasting portion for forming the exterior sleeve from a paper blank plate into a tubular shape. , The corners of the blank plate are cut. (Patent Document 1).

Therefore, the inward curl portion, which is the lower end of the body pasting portion, cannot obtain sufficient curl upward, and the tip of the inward curl portion and the body portion or thread tail portion of the container body The distance of was sometimes large. Therefore, for example, when the thread tail portion of the paper cup of the container body is known and inserted into the upper opening of the exterior sleeve and set, the thread tail portion catches the tip of the inward curl portion, thereby causing the inside of the container body. The shape of the facing curl part was sometimes damaged.

Further, as a container for microwave cooking, there is a heat-insulating double container in which the main body container has a flat bottom shape. (Patent Document 2).
In such a container, in order to avoid touching the main body container which becomes hot during microwave cooking, the lower wrinkle curl portion of the outer sleeve is positioned below the bottom of the main body container, and the lower wrinkle curl portion is positioned below the bottom of the main body container. By supporting the portion with fingers, the heat-insulated double container is gripped. By doing so, it is possible to prevent the fingers from touching the bottom of the main body container.

However, when the lower wrinkle curl portion is projected below the heat insulating double container, the lower wrinkle curl becomes generally visible. In such a situation, if the corner cut portion of the body pasting portion of the outer sleeve is too large, the incompleteness of the curl becomes conspicuous.

Further, in the conventional heat-insulating double container, when the lower curl of the outer sleeve is located above the bottom of the container body (including the lower end of the thread tail portion of the paper cup), the lower curl portion and the said lower curl portion. Since the body of the container body comes into contact with the container body, the lower buttock curl is fixed and its shape can be easily maintained.
However, when the lower curl is located below the bottom of the container body, it becomes difficult for the lower curl portion and the inner curl portion to come into contact with each other, and it becomes difficult to press the lower curl portion. Therefore, it becomes difficult for the lower curl to retain its shape, and the curl may open from the desired shape of the curl portion in an attempt to return to a flat plate shape. This phenomenon is called curl return.

JP-A-2002-255147 Japanese Unexamined Patent Publication No. 2014-169093

The present invention has been made in view of such a situation, and the underside curl portion of the outer sleeve can be easily formed, a good curl shape can be obtained, and a heat insulating double can reduce curl return. The purpose is to provide a container.

In order to solve the above problems, the heat insulating double container according to the embodiment of the present invention is used.
A container body 11 having a body portion 22 and a bottom portion 23 arranged at the lower end of the body portion 22 and
In a heat insulating double container composed of a tubular outer sleeve 30
At the lower end of the outer sleeve 30, there is a lower curl portion 31 formed by curling the outer sleeve 30 toward the center of the container.
In the vicinity of the upper edge portion of the exterior sleeve 30, a joint portion 12 joined to the body portion 22 of the container body 11 and a joint portion 12
The exterior sleeve 30 is arranged at least in a part between the lower curl portion 31 and the joint portion 12 while ensuring a space on the outer edge of the body portion 22, and is arranged with the exterior sleeve 30. Both ends of the strip-shaped blank plate 60 are provided around the container body 11 so as to have a body-pasting portion 32 in which both ends thereof are overlapped with each other by a desired width.
The inner sill body pasting allowance 61, which is the inner sill of the body pasting portion 32, is cut from the region of the lower sill curl allowance 63 corresponding to the lower sill curl portion 31 to the other region.
The area of the lower sill curl allowance 63 corresponding to the lower sill curl portion 31 and the area A in which the inner sill body sticking allowance 61 and the outer sill body sticking allowance 62 overlap is the area of the body. The width of the pasted portion 32 and the area of the lower curl allowance 63 are less than 50% of the area where they overlap.
The distance between the lowermost position B of the region A where the inner sill body sticking allowance 61 and the outer sill body sticking allowance 62 overlap and the extension line of the lower end of the blank plate 60 of the exterior sleeve 30 is below. It is characterized in that it is 1/3 or less of the width in the vertical direction of the region of the Gawa curl allowance 63.

Further, in the heat-insulating double container according to the embodiment of the present invention, the container body 11 may be a container mainly made of paper.

Further, in the heat-insulating double container according to the embodiment of the present invention, the container body 11 may be a paper cup.

Further, in the heat-insulating double container according to the embodiment of the present invention, the container body 11 may have a flat bottom shape.

Further, in the heat-insulating double container according to the embodiment of the present invention, the position of the lower end of the lower curl portion 31 of the exterior sleeve 30 may be lower than the bottom portion 14 of the container body 11.

Further, in the heat insulating double container according to the embodiment of the present invention, the lower curl portion 31 of the exterior sleeve 30 may be located below the bottom portion 14 of the container body 11 and may be separated from each other.

Further, in the heat-insulating double container according to the embodiment of the present invention, the container body 11 may be made of synthetic resin.

Further, in the heat-insulating double container according to the embodiment of the present invention, the container body 11 is made of synthetic resin, and the position of the lower end of the lower curl portion 31 of the exterior sleeve 30 is the bottom portion 14 of the container body 11. May be below.

Further, in the heat-insulating double container according to the embodiment of the present invention, the container body 11 is made of synthetic resin, and the lower curl portion 31 of the exterior sleeve 30 is below the bottom portion 14 of the container body 11. It may be located and separated.

The inner sill body sticking allowance 61, which is the inner sill of the body sticking portion 32 of the exterior sleeve 30, is cut from the area of the lower sill curl allowance 63 corresponding to the lower sill curl portion 31 to the other area. In addition, the area of the lower sill curl allowance 63 corresponding to the lower sill curl portion 31 and the area A in which the inner sill body sticking allowance 61 and the outer sill body sticking allowance 62 overlap is the area A. Since the width of the body-pasted portion 32 and the region of the lower curl allowance 63 are less than 50% of the area of the overlapping region, the inward curl portion 31 is easily formed and the shape is stable.
The area where the width of the body sticking portion 32 and the region of the lower curl allowance 63 overlap is that the length of the side in the vertical (upper and lower) direction is the vertical width of the lower curl allowance 63. Yes, the length of the side in the lateral (left and right) direction is the area of the rectangle that is the width of the body pasting portion 32.

Further, the position B at the lowermost end of the area A in which the outer wall body pasting allowance 62 and the inner armor body pasting allowance 61, which are the outer edges of the body pasting portion 32, are overlapped, and the lower end of the exterior sleeve 30. Since the distance Y from the extension line of the portion 74 is 1/3 or less of the width X in the vertical direction of the region of the lower curl allowance 63, curl return is unlikely to occur, and the curl returns inward over time. The shape of the curl portion 31 is stable.

According to the present invention, the inward curl portion of the exterior sleeve can be easily formed, and the shape of the formed inward curl portion can be maintained over time.
Therefore, the quality of the heat-insulating container provided with the outer sleeve on the outer periphery of the container body can be improved, and the non-defective rate can be improved.

It is a top view of the blank plate of the exterior sleeve of this invention. It is a top view of the blank plate of the exterior sleeve of the prior art. (A) It is an enlarged view of the lower part of the body sticking part of the exterior sleeve before the lower arm curl processing of this invention, and (b) the lower part of the body sticking part of the exterior sleeve before the lower arm curl processing of the prior art. It is a figure. It is sectional drawing of the heat insulation double container of 1st Embodiment of this invention. It is sectional drawing of the heat insulation double container of 4th Embodiment of this invention. It is sectional drawing of the heat insulation double container of the 5th Embodiment of this invention. It is sectional drawing of the heat insulation double container of the 6th Embodiment of this invention. It is an enlarged view of the body sticking part of the lower arm curl part of the outer sleeve of the sixth embodiment of this invention.

Hereinafter, the present invention will be described with reference to the drawings. However, the present invention is not limited to these specifically exemplified forms and various concretely described structures.
In each figure, the size and ratio of the members may be changed or exaggerated for the sake of clarity. In addition, for the sake of readability, unnecessary parts for explanation and repeated codes may be omitted.

<First Embodiment of the present invention>
The heat-insulated double container 10 according to the first embodiment will be described below with reference to drawings and the like.

FIG. 1 shows a blank plate 60 of the exterior sleeve 30 of the heat insulating double container 10 of the present invention, and FIG. 2 shows a blank plate 60 of the exterior sleeve 30 of the prior art.
The shape of the exterior sleeve 30 formed by processing the blank plate 60 of FIG. 1 and the shape of the exterior sleeve 30 formed by processing the blank plate 60 of FIG. 2 are substantially the same.

The difference between the shape of the blank plate 60 in FIG. 1 and the shape of the blank plate 60 in FIG. 2 is the difference in the corner cut portion 65 at the lower part of the side end portion 67 of the left side of the blank plate 60 in both figures.
The surface of the blank plate 60 of FIGS. 1 and 2 becomes the outer surface of the container, and the upper surface of the blank plate 60 becomes the upper surface of the heat-insulating double container. The above positional relationship is also applied to the following explanations and drawings.

The left edge of the blank plate 60 in FIG. 1 is an outer edge side end portion 67 that becomes an outer edge when the blank plate 60 is attached to the body in a tubular shape. Adjacent to the outer wall side end portion 67, there is an outer wall body pasting allowance 62, and a square cutting line 72 is provided at the lower end of the outer wire body pasting allowance 62. The region cut and deleted by the corner cutting line 72 is the corner cutting portion 65.

The right edge of the blank plate 60 in FIG. 1 is an inner edge side end 66 that becomes an inner edge when the blank plate 60 is attached to the body in a tubular shape. Adjacent to the inner sill side end 66, there is an inner sill body sticking allowance 61, and a square cutting line 71 is provided at the lower end of the inner sill body sticking allowance 61. The region cut and deleted by the corner cutting line 71 is the corner cutting portion 64.

The blank plate 60 of the present embodiment is bent into a tubular shape, and the outer ridge of the inner sill body sticking allowance 61 and the inner sill of the outer sill body sticking allowance 62 are overlapped and joined. Since the blank plate 60 is fan-shaped, when the left and right ends of the blank plate 60 are bonded together to form a tubular shape, an inverted truncated cone shape is formed.
FIG. 3A shows an enlarged view of the lower part of the body-pasted portion 32 of the blank plate 60 which has been made into a tubular shape.
Further, FIG. 3B is an enlarged view of the lower part of the body-pasted portion 32 of the blank plate 60 by pasting the blank plate 60 of the prior art shown in FIG. 2 in a tubular shape.
FIG. 3 is a view looking at the outside of the container.

FIG. 3A will be described in more detail.
The outer sill body sticking allowance 62 is overlapped with the outer sill of the container, and the inner sill body sticking allowance 61 is overlapped with the inner sill of the container, and the body sticking portion 32 of the outer sleeve 30 is formed. .. The width of the body pasting portion 32 is the distance between the inner edge side end portion 66 and the outer edge side end portion 67.

FIG. 3A shows a boundary line 68 of the region of the lower curl portion 31, and when the lower curl portion 31 of the exterior sleeve 30 is formed, the region of the lower curl portion 31 is formed. The lower curl allowance 63 sandwiched between the boundary line 68 and the lower end portion 74 of the blank plate 60 of the present embodiment is used to form the lower curl portion 31 toward the inner side of the exterior sleeve 30. To.

In the area of the lower curl allowance 63, the area of the area where the inner wire body pasting allowance 61 and the outer wire body pasting allowance 62 overlap is such that the lower wire curl allowance 63 and the body pasting portion 32 overlap. It is less than 50% of the area of the overlapping region B (shown by hatching in FIG. 3A). For this reason, when processing the lower curl portion 31, the force required for processing can be reduced. Further, since the workability of the body-pasted portion 32 of the lower curl portion 31 is improved, the shape defect of the curl processing is reduced.

Further, since the square cut portion 65 of the outer shell sticking allowance 62 is smaller than the square cut portion 65 of the blank plate 60 (see FIG. 3B) of the prior art, the blank plate 60 pasted on the trunk before curling is performed. When the body-pasted portion 32 of the above is visually viewed from the outside, the cut-out portion of the blank plate 60 is reduced, and the surface of the blank plate 60 is large.

When the lower end portion 74 of the blank plate 60 of the present embodiment to which the body is attached is subjected to inward curl processing, the lower curl portion 31 of the body affixed portion 32 has a lower diameter of a place other than the body affixed portion 32. Similar to the curl portion 31, the radial cross section of the container (the vertical plane including the central axis of the container) is closer to a more perfect curl shape.
When the square cut portion 65 of the outer sill body sticking allowance 62 becomes large, the tip of the lower sill curl portion 31 becomes halfway, and the lower sill curl portion 31 becomes incomplete. Therefore, the shape retention of the lower curl portion 31 is inferior, and curl return may occur over time.

The shape of the blank plate 60 will be described.
The shape of the blank plate 60 is the shape of the outer sleeve 30 of the outer shell of the inverted truncated cone-shaped heat insulating double container 10, and has a fan shape described in Patent Document 1 and the like. The blank plate 60 of this embodiment also has a similar fan shape.

It is desirable that the corner cut portion 65 at the lower part of the outer shell body pasting allowance 62 of the present embodiment has the following shape.
In the area where the outer body sticking allowance 62 of the body sticking portion 32 of the exterior sleeve 30 of the present embodiment and the inner bar body sticking allowance 61 are overlapped, the lowermost position B and the outer wall It is desirable that the distance Y from the extension line of the lower end portion of the blank plate 60 extending in the direction of the side end portion 67 is 1/3 or less of the width X in the vertical direction of the region of the lower curl allowance 63. (See FIG. 3 (a)).

The processing accuracy (pulling accuracy) of the blank plate 60 and the assembly accuracy of the outer sleeve 30 are not good, and when the blank plate 60 is processed into a tubular shape, the inner and outer body sticking allowances 61 and the outer body sticking allowances are not good. The 62 may not overlap at an appropriate position, but may be displaced in the vertical direction and pasted together.

Even in that case, the corner portion C of the lower edge of the outer edge side end portion 67 on the left edge of the blank plate 60 of FIG. 3A protrudes below the lower end portion 74 of the blank plate 60. It is not desirable to do so. The reason is that the protruding corner portion C may induce a curl defect in the curl processing step of the next step.
In order to avoid the above situation, it is desirable that the distance Y is 1/10 or more of the distance X.

Since the blank plate 60 is fan-shaped, the lower end portion 74 of the blank plate 60 is an arc. Therefore, the extension line of the lower end portion of the blank plate 60 extending in the direction of the outer edge side end portion 67 is an arc, but here, the length of the extension line is the length of the lower end portion 74 of the blank plate 60. Since it is much shorter than that, it may be approximated by a straight line. In that case, the tangent line of the lower end portion 74 (arc) of the blank plate 60 is drawn starting from the intersection of the square cutting line 72 of the outer wall body pasting allowance 62 and the lower end portion 74 of the blank plate 60. do it.
If the distance Y between the position B and the extension line is 1/3 or less of the width of the lower curl allowance 63, the lower part is in the radial direction of the container (the vertical surface including the central axis of the container). The curl of the gawa curl portion 31 is wound until the tip of the curl faces upward.

In order to manufacture the exterior sleeve 30, first, the inner sill body pasting allowance 61 and the outer sill body pasting allowance 62 of the blank plate 60 are overlapped and joined to form a tubular lower end portion 74 of the blank plate 60. An exterior sleeve 30 is produced, which is provided with a lower curl portion 31 that has been curled inward. The curl processing may be performed by pressing a mold having a groove shape that matches the shape of the lower curl portion 31.

Next, the outer sleeve 30 is put on the outer surface of the container body 11 to manufacture a heat-insulating double container 10. The container body 11 is not particularly limited, but in the present embodiment, as an example, a heat insulating double container 10 in which the paper cup 20 and the outer sleeve 30 are combined using the paper cup 20 often used in the market is shown in FIG.

The paper cup 20 is provided with a top curl portion 21 on the upper edge portion of the body portion 22 in which a member of the body portion 22 is curled outward. Further, at the lower part of the body portion 22, a bottom portion 23 is joined so that a portion in which the member of the body portion 22 is bent downward is inserted into a gap in which the member of the body portion 22 is folded upward and the tip thereof is folded upward. It is provided with a thread tail portion 24 which is a joint portion between the body portion 22 and the bottom portion 23.

The paper cup 20 and the exterior sleeve 30 are formed between the outer edge of the body 22 located directly below or near the lower edge of the top curl portion 21 of the paper cup 20 and the inner edge of the outer sleeve 30. The river is joined.
As for the above joining method, an adhesive (emulsion type, hot melt type, etc.) is preferable, and the emulsion type adhesive is preferably used when there is no gap between the paper cup 20 and the outer sleeve 30. The hot melt adhesive is preferably used when there is a gap between the paper cup 20 and the outer sleeve 30.
Other joining methods may be used, for example, the outer edge of the body 22 of the paper cup 20 and / or the inner edge of the outer sleeve 30 may be provided with a heat-adhesive layer and heat-sealed.

At least a part between the joint portion 12 between the body portion 22 of the paper cup 20 and the exterior sleeve 30 and the lower curl portion 31, the outer edge of the body portion 22 of the paper cup 20 and the space are secured. Since the exterior sleeve 30 is arranged, the space serves as a heat insulating layer. When the high-temperature contents are put into the paper cup 20, the body portion 22 of the paper cup 20 becomes hot, but the outer surface of the body portion 33 of the exterior sleeve 30 does not become hot.

In the heat insulating double container 10 of FIG. 4, the lower wrinkle curl portion 31 of the outer sleeve 30 is a wrinkle above the lower end of the thread tail portion 24 of the paper cup 20, so that the lower wrinkle curl portion 31 is the paper cup 20. The position is in contact with or close to the thread tail portion 24 of the above. Alternatively, when the height (length in the vertical direction) of the exterior sleeve 30 is low (short), the lower curl portion 31 is in contact with or close to the body portion 22 of the paper cup 20.

In the above case, since the lower curl portion 31 of the exterior sleeve 30 is in contact with the paper cup 20, it is possible to suppress the state in which the lower curl portion 31 is about to return. It is more desirable because the lower curl portion 31 itself of the outer sleeve 30 has a shape-retaining property that suppresses the return of curl.

When the paper cup 20 and the outer sleeve 30 are combined, the thread tail portion 24 of the paper cup 20 is known, and the opening above the outer sleeve 30 is inserted and set. At that time, the thread tail portion 24 does not catch the tip of the lower curl portion 31 of the exterior sleeve 30, and the heat insulating double container 10 can be stably produced.

<Second Embodiment of the present invention>
A second embodiment of the present invention is characterized in that, in the heat-insulating double container 10 of the first embodiment, the container body 11 is a paper container mainly made of paper.
Since both the container body 11 and the outer sleeve 30 are made of paper, it is easy to reduce the volume after use and incinerate. It may also be collected as used paper. The paper container described above may be a paper cup, a paper drawing tray, a web corner tray, a pulp mold container, or the like.

<Third Embodiment of the present invention>
A third embodiment of the present invention is characterized in that, in the heat-insulating double container 10 of the first embodiment, the container body 11 is a paper cup 20. (See FIG. 4). If the container body 11 is a paper cup 20, the paper cup 20 is produced with high capacity, so that a heat-insulated double container can be manufactured at low cost. Further, since the top curl portion 21 is provided on the upper portion of the paper cup 20 and the thread tail portion 24 is provided on the lower portion of the container, the strength of the heat insulating double container is excellent.

<Fourth Embodiment of the present invention>
A fourth embodiment of the present invention is characterized in that, in the heat-insulating double container 10 of the first embodiment, the container body 11 is a paper container having a flat bottom shape.

Nowadays, the market demands a container that can be cooked in a microwave oven due to the demand for a simple cooking method. Moreover, since the contents become hot due to microwave cooking, a container having heat insulating properties is desired.

By forming the container body 11 into a paper container having a flat bottom shape, the thread tail can be eliminated from the container body 11, so that the charring that occurs at the thread tail can be prevented.

Here, as a flat bottom-shaped paper container, the flat-bottom-shaped paper cup 40 shown in FIG. 5 in which the body portion 42 and the bottom portion 43 are made of separate members will be described as an example. The present embodiment is not limited to the flat bottom-shaped paper cup, and may be a paper drawing tray, a web corner tray, a pulp mold container, or the like.
The flat bottom-shaped paper cup 40 has an outward top curl portion 41 on the upper edge portion of the body portion 42.

The lower end of the body 42 of the flat bottom-shaped paper cup 40 is bent inward at a substantially right angle, the tip of the further bent body 42 is folded upward, and the tip is outward. It is folded back so that it can be turned.
The member of the bottom portion 43 is circular, and the peripheral portion thereof fits snugly into the lower end portion of the body portion 42. The peripheral edge of the member of the bottom 43 is folded inward by the lower part of the bottom 43, and the folded portion of the member of the bottom 43 is the lower end of the body 42 and the folded portion of the body 42. It is sandwiched between the parts. These sandwiching portions are joined (bonded, welded, etc.) to each other at least partially, preferably entirely.

<Fifth Embodiment of the present invention>
In a fifth embodiment of the present invention, in a heat insulating double container 10 in which the container body 11 of the fourth embodiment is a paper cup 40 having a flat bottom shape, the outer sleeve 30 is extended to the bottom as shown in FIG. The lower wrinkle curl portion 31 is positioned at the lower wrinkle of the bottom portion 43 while being in contact with the bottom portion 43 of the flat bottom-shaped paper cup 40 or the joint portion 44 of the bottom portion 43. ..

By doing so, when the heat insulating double container 10 is gripped by the fingers, the fingers support the lower end of the lower curl portion 31 separated from the bottom portion 43, so that the bottom portion 43 becomes hot. Less touching. Further, the force that supports the lower wrinkle curl portion 31 with the fingers is transmitted through the joint portion 44 of the bottom portion 43 that is in contact with the lower wrinkle curl portion 31 to support the container body 11, so that the container can be gripped. Is stable.

When the lower curl portion 31 of the exterior sleeve 30 is in contact with the flat bottom-shaped paper cup 40, the state in which the curl is about to return can be suppressed by the flat bottom-shaped paper cup 40. The lower curl portion 31 itself of the exterior sleeve 30 of the present embodiment has a shape-retaining property that suppresses curl return, which is more desirable.

In the heat insulating double container 10 in which the lower curl portion 31 of the outer sleeve 30 is higher than the lower end of the thread tail portion 24 of the paper cup 20 as shown in FIG. 5, the lower curl portion 31 is outside the heat insulating double container 10. It can be seen from the bottom and the bottom, but it cannot be seen from the inside because it is shielded by the paper cup 20. Therefore, even if there is an aesthetically inferior part in the lower curl portion 31, it is concealed.

However, the inner wrinkles of the lower wrinkle curl portion 31 of the outer sleeve 30 of the present embodiment can be visually recognized from the outside.
As shown in FIG. 8B, the corner of the outer shell body pasting allowance 62 of the blank plate 60 is attached to the body pasting portion 32 of the lower arm curl portion 31 of the exterior sleeve 30 using the blank plate 60 of the prior art. Since the cut portion 65 is exposed, the lower curl portion 31 is incomplete.

However, the body sticking portion 32 of the lower curl portion 31 of the exterior sleeve 30 of the present embodiment is shown in the drawing because the shape of the square cut portion 65 of the outer shell sticking allowance 62 of the blank plate 60 is appropriate. As shown in 8 (a), the body-pasted portion 32 of the lower wrinkle curl portion 31 is curled until the tip of the lower wrinkle curl portion 31 faces upward, and the curl is completed. Therefore, since the appearance of the lower curl portion 31 is excellent, there is no problem because the inner wrinkle of the lower curl portion 31 has an excellent appearance even if it becomes visible from the outside.

The shape of the lower curl portion 31 of the outer sleeve 30 may be such that the lower end portion 74 thereof faces upward and outward as shown in FIG. Further, as shown in FIG. 5, the lower end portion 74 may be wound until the lower end portion 74 faces downward.
In addition to the present embodiment, the shape of the lower curl portion 31 of the exterior sleeve 30 may be such that the lower end portion 74 thereof faces upward and outward as shown in FIG. Further, as shown in FIG. 5, the lower end portion 74 may be wound until the lower end portion 74 faces downward.

The boundary line 68 of the region of the lower curl portion 31 of the blank plate 60 of the exterior sleeve 30 shown in FIG. 1 is shown in FIG. The boundary line 68 is a point at which the straight body portion 33 transitions to the curved lower curl portion 31 in the vertical cross section of the exterior sleeve 30.

<Sixth Embodiment of the present invention>
A sixth embodiment of the present invention is a heat-insulating double container 10 in which the container body of the fifth embodiment is a paper cup 40 having a flat bottom shape, and as shown in FIG. 7, the outer sleeve 30 is further extended to the lower side. Therefore, the position of the lower curl portion 31 is positioned at the lower portion of the bottom portion 43 while being separated from the bottom portion 43 of the flat bottom-shaped paper cup 40.

By doing so, when the heat insulating double container 10 is gripped by the fingers, the fingers are greatly separated from the bottom 43 to support the lower part of the lower curl portion 31, so that the bottom portion becomes hot. The risk of touching 43 is further reduced.

Further, since the lower curl portion 31 does not come into contact with other parts, curl return cannot be suppressed and curl return is likely to occur. However, the body sticking portion 32 of the lower curl portion 31 of the exterior sleeve 30 of the present embodiment is said to have an appropriate shape of the square cut portion 65 of the outer hook body sticking allowance 62 of the blank plate 60. In the region of the curl allowance 63 of the blank plate 60, the inner wire body pasting allowance 61 and the outer wire body pasting allowance 62 appropriately overlap each other. Therefore, since the shape of the lower curl portion 31 is excellent in shape retention, the shape of the lower curl portion 31 is stable and the curl return is reduced.

Further, as in the fifth embodiment, the inside of the lower curl portion 31 of the exterior sleeve 30 is visually recognized, but the appearance of the body-pasted portion 32 of the lower curl portion 31 is excellent. There is no problem even if it is visually recognized from the outside.

The bottom of the heat insulating double container 10 of the present embodiment produced by using the blank plate 60 of the outer sleeve 30 of FIG. 1 is shown in FIG. 8 (a). The bottom of the heat insulating double container 10 of the present embodiment produced by using the blank plate 60 of the outer sleeve 30 of FIG. 2 is shown in FIG. 8 (b).
The lower curl portion 31 of FIG. 8A has a good appearance with no gap in the body pasting portion 32. The lower curl portion 31 of FIG. 8B has a gap in the body pasting portion 32 and is not good in appearance.

<Seventh Embodiment of the present invention>
In the seventh embodiment of the present invention, the container body 11 of the first embodiment is made of a synthetic resin. The shape of the container body 11 may be either a container having a thread tail portion or a container having a flat bottom shape, and the molding method is selected from known molding methods such as injection molding, blow molding, and sheet molding. The material is appropriately selected from known materials such as polyethylene, polypropylene, and polyethylene terephthalate. When the container body 11 is required to have a gas barrier property, a film or a sheet having the gas barrier property may be laminated as appropriate.
The heat-insulated double container of the present embodiment does not have a portion that overheats during microwave cooking, and is therefore suitable for microwave cooking applications.

<Eighth Embodiment of the present invention>
The eighth embodiment of the present invention is a combination of the seventh embodiment in which the container body 11 is a container made of synthetic resin, and the exterior sleeve 30 of the fifth embodiment.
The microwave cooking suitability of the container body 11 is the same as that of the seventh embodiment. Further, since the features of the exterior sleeve 30 are the same as those of the fifth embodiment, detailed description and drawings will be omitted.

<Ninth Embodiment of the present invention>
The ninth embodiment of the present invention is a combination of the seventh embodiment in which the container body 11 is a container made of synthetic resin and the exterior sleeve 30 of the sixth embodiment.
The microwave cooking suitability of the container body 11 is the same as that of the seventh embodiment. Further, since the features of the exterior sleeve 30 are the same as those of the sixth embodiment, detailed description and drawings will be omitted.

Next, specific examples of the present invention will be described.

(Example 1)
First, a paper cup to be the main body of the container was prepared. It was a heat-insulated double container of a paper cup having an inner diameter of 94 mm, an outer diameter of the top curl portion of 100 mm, a thickness of the top curl portion of 3.7 mm, a bottom outer diameter of 70 mm, a height of 94 mm, and a full filling capacity of 453 ml. It was a heat-insulated double container having a shape as shown in FIG.

The layer structure of the laminated body of the body of the paper cup is
(Outside) PP20 μm (made by PHA03A SunAllomer) /
Paper 220g / m ² (manufactured by COC HCV O & C ivory board) /
PP40 μm (made by PHA03A SunAllomer) (Uchigawa)
Met.
The laminate was laminated by extruded laminate, dry laminate, and rolled. The roll-shaped laminate was punched out on a blank plate having a predetermined shape without a platen, and was stacked and stored.

For the member at the bottom of the flat bottom-shaped paper cup, a strip-shaped bottom paper roll having a width of 94 mm was prepared.
The layer structure of the bottom laminate is
(Outside) PP20 μm (made by PHA03A SunAllomer) /
Paper 220g / m ² (manufactured by COC HCV O & C ivory board) /
PP40 μm (made by PHA03A SunAllomer) (Uchigawa)
Met.

The blank plate was supplied to a paper cup molding machine, and both ends thereof were sealed to form a tubular body.
Next, the bottom paper roll was supplied to the paper cup molding machine, and after being pulled out into a predetermined shape in the machine of the paper cup molding machine, the outer edge portion was bent downward over the entire circumference to form a bottom member. The outer edge portion of the member at the bottom thereof was sandwiched between the gaps underneath the body portion that were folded inward, and then joined and sealed to complete the thread tail portion. Since the parts required for joining were heated before joining, heat sealing was possible.

Next, the body portion was curled outward on the upper edge to complete a general paper cup-shaped paper cup having a thread tail portion.

In order to manufacture the outer sleeve, a blank plate as shown in FIG. 1 was prepared.
The width was 300 mm, the height was 115 mm, the radius of curvature of the arc at the upper edge was 422 mm, and the radius of curvature at the lower end was 324 mm.

As shown in FIG. 3A, the corner cut portion of the outer shell sticking allowance of the blank plate was X = 6 mm and Y = 1.9 mm. Therefore, Y was 1/3 or less of X.

Both ends of the blank plate were sealed with an adhesive and processed into a tubular shape. Next, the underside of the tubular blank plate was curled inward to complete the exterior sleeve.

The layer structure of the exterior sleeve is
Paper 310g / m ² (manufactured by UF Coat Oji Materia)
Met. The above-mentioned coated cardboard is excellent in strength and cost performance.

Then, the outer sleeve was fitted to the outer edge of the flat bottom-shaped paper cup and joined by the lower edge of the top curl portion of the paper cup to complete the heat-insulating double container.

The lower curl portion of the outer sleeve was located above the bottom portion of the paper cup. (See FIG. 4).

The material (layer structure) of the exterior sleeve is not limited to the contents described above. It is appropriately selected according to the application, usage environment, cost, and required performance of the heat insulating double container. For example, in an environment where moisture is easily absorbed, such as in a high humidity environment, a synthetic resin layer may be provided on both sides or one side of the paper base material layer to improve the moisture resistance.

The method for molding the paper cup, the method for manufacturing the outer sleeve, and the method for manufacturing the heat-insulating double container (such as the method for joining the paper cup and the outer sleeve) may be appropriately selected depending on factors such as the materials of the respective materials. Good.

(Example 2)
It was a heat-insulated double container of a flat bottom-shaped paper cup having an inner diameter of 94 mm, an outer diameter of the top curl portion of 100 mm, a thickness of the top curl portion of 3.7 mm, a bottom outer diameter of 76 mm, a height of 86 mm, and a full filling capacity of 453 ml. It was a heat-insulated double container having a shape as shown in FIG.

The material of the container body, the layer structure, and the paper cup molding process were the same as in Example 1.
A flat bottom-shaped paper cup was completed by tilting the thread tail portion of the molded paper cup over the entire circumference, heating the required portion, and fixing the thread end portion by pressurizing the bottom portion.

Next, an outer sleeve was produced in the same procedure as in Example 1, and the outer sleeve and the flat bottom-shaped paper cup were combined to complete a heat-insulating double container.
The material and shape of the outer sleeve were the same as in Example 1.

(Example 3)
It was a heat-insulated double container of a flat bottom-shaped paper cup having an inner diameter of 94 mm, an outer diameter of the top curl portion of 100 mm, a thickness of the top curl portion of 3.7 mm, a bottom outer diameter of 74 mm, a height of 92 mm, and a full filling capacity of 453 ml. It was a heat-insulated double container having a shape as shown in FIG. 7.
The flat bottom-shaped paper cup used as the container body was the same as in Example 2.

The material of the outer sleeve is the same as that of the first embodiment, but the height is increased. The size of the blank plate of the outer sleeve was 300 mm in width and 120 mm in height, the radius of curvature of the arc at the upper edge was 422 mm, and the radius of curvature at the lower end was 319 mm.

The corner cut portion of the outer shell sticking allowance of the blank plate was the same as in Example 1 (see FIG. 3A), X = 6 mm, and Y = 1.9 mm. Therefore, Y was 1/3 or less of X.

(Example 4)
In Example 1, the container body was a paper cup, but in this example, a polypropylene cup having the same size as the paper cup and manufactured by injection molding was prepared.
The other methods for manufacturing the outer sleeve and the heat-insulating double container were the same as in Example 1.

(Example 5)
In Example 2, the container body was a paper cup having a flat bottom shape, but in this example, a polypropylene cup having the same size as the flat bottom shape paper cup and manufactured by sheet molding was prepared.
The other methods for manufacturing the exterior sleeve and the heat-insulating double container were the same as in Example 2.

(Example 6)
It was manufactured by the same material and manufacturing method as the heat insulating double container of Example 5 except that the height of the outer sleeve was different (higher).

(Comparative Example 1)
It was manufactured by the same material and manufacturing method as the heat insulating double container of Example 1 except that the shape of the outer sleeve was different. As shown in FIG. 3B, the corner cut portion of the outer shell sticking allowance of the blank plate is X = 6 mm and Y = 3.9 mm. Therefore, Y was more than 1/3 of X.

(Comparative Example 2)
It was manufactured by the same material and manufacturing method as the heat-insulated double container of Comparative Example 1 except that the container body was a paper cup having a flat bottom shape.

(Comparative Example 3)
It was manufactured by the same material and manufacturing method as the heat insulating double container of Comparative Example 2 except that the height of the outer sleeve was different (higher).

(Evaluation)
1,000 samples were prepared for each of Examples 1 to 6 and Comparative Examples 1 to 3.

The evaluation results are summarized in Table 1 and Table 2. Table 1 shows the evaluation of the shape of the heat insulating double container and the evaluation in the manufacturing process. Table 2 shows the evaluation of microwave cooking suitability and the comprehensive evaluation.

When the heat-insulated double container of Example 1 was produced, curl winding failure did not occur in the lower curl portion of the outer sleeve.
Further, in the step of combining the paper cup and the outer sleeve, the operation when the thread tail portion of the paper cup fits into the lower wrinkle curl portion of the outer sleeve was smooth and stable without being caught.
Moreover, when the shape of the outer sleeve was observed one day after the production of the heat-insulating double container, there was no curl return and it was good.

When the heat-insulated double container of Example 2 was produced, curl winding failure did not occur in the lower curl portion of the outer sleeve.
Moreover, when the shape of the outer sleeve was observed one day after the production of the heat-insulating double container, there was no curl return and it was good.
In addition, the inside of the body-pasted portion of the curl portion under the outer sleeve is not hidden by the container body, so that it can be visually recognized. Since the outer shell of the blank plate of the exterior sleeve has an appropriate shape, the appearance is good with few gaps in the body-attached portion.

When the heat-insulated double container of Example 3 was produced, curl winding failure did not occur in the lower curl portion of the outer sleeve.
Moreover, when the shape of the outer sleeve was observed one day after the production of the heat-insulating double container, there was no curl return and it was good.
In addition, the inside of the body-pasted portion of the curl portion under the outer sleeve is not hidden by the container body, so that it can be visually recognized. Since the outer shell of the blank plate of the exterior sleeve has an appropriate shape, the appearance is good with few gaps in the body-attached portion.

When the heat-insulated double container of Example 4 was produced, curl winding failure did not occur in the lower curl portion of the outer sleeve.
Further, in the process of combining the polypropylene cup and the outer sleeve, the operation when the thread tail portion of the polypropylene cup fits into the lower curl portion of the outer sleeve is smooth and stable without being caught. It was.
Moreover, when the shape of the outer sleeve was observed one day after the production of the heat-insulating double container, there was no curl return and it was good.

When the heat-insulated double container of Example 5 was produced, curl winding failure did not occur in the lower curl portion of the outer sleeve.
Moreover, when the shape of the outer sleeve was observed one day after the production of the heat-insulating double container, there was no curl return and it was good.
In addition, the inside of the body-pasted portion of the curl portion under the outer sleeve is not hidden by the container body, so that it can be visually recognized. Since the outer shell of the blank plate of the exterior sleeve has an appropriate shape, the appearance is good with few gaps in the body-attached portion.

When the heat-insulated double container of Example 6 was produced, curl winding failure did not occur in the lower curl portion of the outer sleeve.
Moreover, when the shape of the outer sleeve was observed one day after the production of the heat-insulating double container, there was no curl return and it was good.
In addition, the inside of the body-pasted portion of the curl portion under the outer sleeve is not hidden by the container body, so that it can be visually recognized. Since the outer shell of the blank plate of the exterior sleeve has an appropriate shape, the appearance is good with few gaps in the body-attached portion.

When the heat-insulated double container of Comparative Example 1 was produced, curl winding failure did not occur in the lower curl portion of the outer sleeve.
Further, in the step of combining the flat bottom-shaped paper cup and the outer sleeve, there was a sign that the operation when the thread tail portion of the flat bottom-shaped paper cup fits into the lower curl portion of the outer sleeve is caught. No curl defects were found in the final product of the heat-insulated double container, but there was a risk of curl defects occurring in long-term production.
Moreover, when the shape of the outer sleeve was observed one day after the production of the heat-insulating double container, there was no curl return and it was good.

When the heat-insulated double container of Comparative Example 2 was produced, curl winding failure did not occur in the lower curl portion of the outer sleeve.
Further, when the shape of the outer sleeve was observed one day after the production of the heat-insulating double container, there was a container in which a weak curl return occurred.
In addition, the inside of the body-pasted portion of the curl portion under the outer sleeve is not hidden by the container body, so that it can be visually recognized. The appearance was inferior due to the large number of voids in the body-pasted portion.

When the heat-insulated double container of Comparative Example 3 was produced, curl winding failure did not occur in the lower curl portion of the outer sleeve.
Further, when the shape of the exterior sleeve was observed one day after the production of the heat-insulating double container, all curl returns occurred.
In addition, the inside of the body-pasted portion of the curl portion under the outer sleeve is not hidden by the container body, so that it can be visually recognized. The appearance was inferior due to the large number of voids in the body-pasted portion.

As a comprehensive evaluation as a heat insulating container for microwave cooking, Example 3 is ⊚ and Example 2 is ◯. In Example 1 and Comparative Example 1 in which the container body is a paper cup, the thread tail may be burnt during long-term microwave cooking, so the value is set to x.
In Examples 4 to 6 in which the main container is a polypropylene cup, the container main body did not overheat during cooking in the microwave oven, so the value was given as ⊚.
In Comparative Example 2, the curl of the lower curl portion of the outer sleeve was slightly returned, so the value was set to Δ. In Comparative Example 3, almost all of the curl return of the lower curl portion of the outer sleeve occurs, so the value is set to x.

As a heat-insulating container for containers that are not cooked in a microwave oven, it is expected to be used by pouring hot water. As the comprehensive evaluation, Example 1, Example 3, Example 4, and Example 6 were the best, and Example 2 was good.
In Comparative Example 1, no curl defect occurred in the lower curl portion of the outer sleeve when the sample for evaluation was prepared, but due to the behavior during production, there is a possibility that curl defect may occur in long-term production. Therefore, the evaluation was set to ○ to △.
In Comparative Example 2, the curl of the lower curl portion of the outer sleeve was slightly returned, so the value was set to Δ. In Comparative Example 3, almost all of the curl return of the lower curl portion of the outer sleeve occurs, so the value is set to x.

INDUSTRIAL APPLICABILITY The present invention can provide a heat-insulating double container having an excellent appearance of the lower curl portion of the outer sleeve. Further, since the shape-retaining property of the lower curl portion is excellent, it is possible to provide a heat-insulating double container capable of maintaining a good shape of the lower curl portion.

10 Insulated double container 11 Container body 12 Joint between container body and exterior sleeve 13 Body of container body 14 Bottom of container body 20 Paper cup 21 Top curl of paper cup 22 Body of paper cup 23 Bottom of paper cup 24 Thread tail of paper cup Part 30 Exterior sleeve 31 Curl part under the outer sleeve 32 Body pasting part of the exterior sleeve 33 Body part of the exterior sleeve 40 Flat bottom shaped paper cup 41 Flat bottom shaped paper cup top curl part 42 Flat bottom shaped paper cup body Part 43 Bottom of flat bottom-shaped paper cup 44 Joint of bottom of flat-bottomed paper cup 50 Synthetic resin cup 51 Synthetic resin cup body 52 Synthetic resin cup bottom 60 Exterior sleeve blank plate 61 Inner buttock sticking allowance 62 Outer buttock sticking allowance 63 Lower buttock curl allowance 64 Inner buttock sticking allowance corner cutting part 65 Outer buttock sticking allowance corner cutting part 66 Blank plate inner lining (right) Side end 67 Blank plate outer edge (left edge) Side edge 68 Boundary line of the area of the lower edge curl 71 Corner cutting line of inner edge carrier attachment allowance 72 Outer edge carrier attachment allowance Square cutting line 73 Upper edge of blank plate 74 Lower edge of blank plate

A Area where the inner and outer body sticking allowances overlap B The lower end of the area where the inner and outer body sticking allowances overlap C The bottom of the outer edge of the blank plate My corner

X Vertical width of the lower curl allowance area Y Distance between the lowermost position B of the area A and the extension line of the lower end of the exterior sleeve

Claims (9)

A container body having a body portion and a bottom portion arranged at the lower end of the body portion, and a container body.
In a heat-insulated double container consisting of a tubular outer sleeve
At the lower end of the outer sleeve, there is a lower curl portion formed by curling the outer sleeve toward the center of the container.
In the vicinity of the upper edge portion of the outer sleeve, a joint portion to be joined to the body portion of the container body and a joint portion
The exterior sleeve is a strip-shaped blank plate that is arranged at least in a part between the lower curl portion and the joint portion while ensuring a space on the outer edge of the body portion and serves as the exterior sleeve. Both ends of the container have a body-pasted portion that is overlapped with each other, and are provided around the container body.
The inner wire body pasting allowance, which is the inner edge of the body pasting portion, is cut from the area of the lower arm curl allowance corresponding to the lower arm curl portion to the other area.
The area of the lower sill curl allowance corresponding to the lower sill curl portion, and the area A in which the inner sill body pasting allowance and the outer sill body pasting allowance overlap is the width of the body pasting portion. The area of the curl allowance is less than 50% of the area where the area overlaps.
The distance between the position B at the lowermost end of the area A where the inner sill body sticking allowance and the outer sill body sticking allowance overlap and the extension line of the lower end of the blank plate of the exterior sleeve is the lower sill curl allowance. A heat-insulated double container characterized in that it is 1/3 or less of the vertical width of the region. The heat-insulating double container according to claim 1, wherein the container body is a container mainly made of paper. The heat-insulating double container according to claim 1 or 2, wherein the container body is a paper cup. The heat-insulating double container according to any one of claims 1 to 3, wherein the container body has a flat bottom shape. The heat-insulating double container according to any one of claims 1 to 4, wherein the position of the lower end of the lower curl portion of the outer sleeve is lower than the bottom portion of the container body. The heat-insulating double container according to claim 5, wherein the lower curl portion of the outer sleeve is located below and separated from the bottom portion of the container body. The heat-insulating double container according to claim 1, wherein the container body is made of a synthetic resin. The heat-insulating double container according to claim 7, wherein the position of the lower end of the lower curl portion of the outer sleeve is lower than the bottom portion of the container body. The heat-insulating double container according to claim 8, wherein the lower curl portion of the outer sleeve is located below the bottom portion of the container body and is separated from the bottom portion of the container body.

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