JP6792540B2 - Double wall container - Google Patents

Description

The present invention relates to a double-walled container configured by connecting an inner container and an outer container and providing a space between them.

Various double-walled containers formed by connecting an inner container and an outer container have been conventionally known (for example, Patent Documents 1 to 4). The space between the double walls is preferably in a vacuum (close to), which enhances the heat insulation of the container.

In the double-walled container disclosed in Patent Documents 1, 2 and 3, the welded portion and the screw thread for connecting and fixing the inner container and the outer container are on the side of the inner container (that is, the inner peripheral surface of the double wall). ) Exists. On the other hand, in the double-walled container of Patent Document 4, if a threaded portion is present on the inner peripheral surface, soup or the like adheres and becomes unsanitary. To avoid this, threads and welded portions are formed on the outer container side. Has been done.

The double-walled container was originally devised to provide a space between the double-walled walls to improve heat insulation. From the viewpoint of heat insulation, the upper opening of the container (opening for a spout) Should be narrow. However, since Patent Document 4 targets a highly viscous soup, a configuration in which the opening is enlarged is adopted even if the heat insulating property is sacrificed to some extent. On the other hand, when targeting beverages that are not as viscous as soup (for example, sports drinks, coffee, tea, etc.), it is preferable to give top priority to heat insulation and narrow the opening of the drinking spout. In that case, in order to secure as large a capacity as possible, it is preferable to make the maximum body diameter of the inner container larger than the opening diameter of the drinking spout of the container.

Japanese Patent No. 6039255 Japanese Unexamined Patent Publication No. 2014-000261 Japanese Unexamined Patent Publication No. 2014-000262 Japanese Unexamined Patent Publication No. 2016-116628

An object of the present invention is to provide a structure suitable for a double-walled container having a relatively small drinking spout by giving priority to heat insulation, and to maintain a relatively large content, and to have a high convenience in the manufacturing process. To provide a container.

Means for Solving Problems and Effects of Invention

The present invention provides a double-walled container with the following features: That is, the double-walled container of the present invention is provided with a space between the inner container and the outer container, and the inner container is provided with a curved folding portion whose upper end is curved outward and folded downward. There is. Then, the peripheral edge of the upper end opening of the outer container comes into contact with the outer side in the radial direction of the curved folded portion of the inner container, and the inner container and the outer container are connected by welding at the contact point.

The double-walled container of the present invention having the above configuration is convenient for assembling both by inserting the inner container from the lower side with the bottom of the outer container open in the manufacturing process. This is because a kind of positioning effect (or centering effect) can be obtained by bringing the upper end opening peripheral edge of the outer container into contact with the curved folded portion of the inner container approaching from below in the radial direction. Because.

In the present invention, it is preferable that at least one of the upper end opening peripheral edge portion of the outer container and the outer peripheral wall portion of the curved folded portion in contact with the upper end opening peripheral edge portion is reduced in diameter toward the upper side of the container.
When such a configuration is adopted, the positioning effect (or alignment effect) is further enhanced. Furthermore, since the alignment function is also exerted on the relative positions of the inner container and the outer container in the height direction, it is possible to improve the manufacturing accuracy by simple control.

In the present invention, it is preferable that the maximum body diameter of the inner container is larger than the opening diameter of the upper end opening peripheral portion of the outer container. When this configuration is adopted, the internal capacity of the container can be relatively large while keeping the opening diameter of the upper opening (drinking mouth) of the double-walled container small.
Further, in this case, it is preferable that at least the portion of the outer container from the outer peripheral wall including the maximum body diameter portion to the upper end opening peripheral edge portion is made of an integral body without a joint portion. As a result, it is possible to suppress an increase in the number of parts constituting the double-walled container and reduce the manufacturing cost.

In the present invention, it is preferable that the screw engaging portion that engages with the screw engaging portion formed on the lid member of the double-walled container is formed on the outer container.
When such a configuration is adopted, the curved folding portion is formed separately on the inner container side, and the screw engaging portion is formed separately on the outer container side. The curled part of the curved folded part has the effect of smoothing the mouthfeel by providing it at the mouthpiece of the container, but a screw engaging part is formed on a member (outer container) different from the curled part. Therefore, it is possible to prevent the curled portion from being deformed in the process of forming the screw. That is, it is possible to avoid inconveniences such as impaired smoothness of mouthfeel and deterioration of welding accuracy between the inner container and the outer container.

The cross-sectional view explaining the structure of the double-walled container which concerns on one Embodiment of this invention. The figure which shows the inner container and the outer container in FIG. 1 independently. The figure explaining the manufacturing process of the double-walled container of FIG. The figure explaining the modification and the comparative example with respect to the double-walled container of FIG.

Embodiments of the present invention will be described with reference to the accompanying drawings. FIG. 1 shows the structure of the double-walled container 10 according to the embodiment of the present invention (the illustration of the lid member that closes the spout is omitted). FIG. 1A is a half cross-sectional view of the double-walled container 10. FIG. 1B is a full cross-sectional view showing a partially enlarged view of the inside of the A region near the opening of the spout.

Further, FIG. 2A shows the inner container 20 constituting the double-walled container 10, and FIG. 2B shows the outer container 30 independently. In the double-walled container 10, a space is formed between the inner container 20 and the outer container 30, thereby enhancing the heat insulating property. The above basic configuration itself is conventionally known.

As shown in FIG. 2A, the inner container 20 is provided with a curved folding portion 21 at the upper end. The curved folded-back portion 21 is composed of a curled portion 21a that curls downward while curling outward in the radial direction, and an outer peripheral wall portion 21b that extends downward from the curled portion 21a.

As shown in FIG. 2B, the outer container 30 is provided with an upper end opening peripheral edge portion 31 above the male threaded portion 35 that engages with the female threaded portion (not shown) of the lid member. As will be described later, in the manufacturing process, the inner container 20 is inserted from the bottom side of the outer container 30, and the bottom portion is finally closed by the bottom member 37.

As shown in a partially enlarged view in FIG. 1 (b), the upper end opening peripheral edge portion 31 of the outer container 30 comes into contact with the radial outer side of the curved folding portion 21 (outer peripheral wall portion 21b) of the inner container 20. At the contact point, the inner container 20 and the outer container 30 are connected and fixed by welding. This configuration is one of the important features of the present invention, which provides the various benefits described below.
That is,
(A): First, the inner container 20 is inserted from the bottom of the outer container 30, and finally the manufacturing process of connecting and fixing the two can be smoothly performed.
(A): By adopting the manufacturing process, the maximum body diameter D1 of the inner container 20 can be made larger than the upper opening diameter D2 of the outer container 30 without inviting an increase in the number of parts (Fig.). 3). As a result, it is possible to secure a relatively large internal capacity while the container is slim with a relatively small opening of the drinking spout.
Hereinafter, they will be described in order.

Regarding (a), the inner container 20 is inserted from the bottom of the outer container 30 in a configuration in which the upper end opening peripheral edge portion 31 of the outer container 30 contacts the curved folding portion 21 (outer peripheral wall portion 21b) of the inner container in the radial direction. This mode is suitable for the manufacturing process. This will be described with reference to FIGS. 3 and 4.
The manufacturing process of inserting the inner container 20 from below with the bottom of the outer container 30 open will be described in the order shown in FIGS. 3A to 3C. In these series of steps, as shown in an enlarged manner in FIG. 4A, the curved folded-back portion 21 of the inner container 20 approaches the upper end opening peripheral edge portion 31 of the outer container 30 from below. At this time, the upper end opening peripheral edge portion 31 relatively approaches the curved folding portion 21 from above.
In this case, if the upper end opening peripheral edge portion 31 is in contact with the curved folding portion 21 (the outer peripheral wall portion 21b) from the outer peripheral side, the upper end opening peripheral edge portion 31 existing on the outer peripheral side enters the curved folding portion 21. Since the alignment function (alignment function) can be exerted with respect to 21, the contact between the two can be completed smoothly. Then, it is possible to smoothly shift to the subsequent welding (fixing).
On the contrary, as shown in the comparative example of FIG. 4C, when the inner container 20 is inserted into the outer container 30 from above, the curved folded-back portion 21 (outer peripheral wall portion 21b) and the upper end opening peripheral edge portion Relative alignment with 31 is difficult, and there is a high possibility that they will interfere with each other and hinder smooth connection (unfavorable).

Regarding (a) When the manufacturing process of inserting the inner container 20 from the bottom side of the outer container 30 is adopted, the maximum body diameter D1 of the inner container 20 is set to the upper opening diameter D2 of the outer container 30 (that is, the opening diameter of the drinking spout). Can be taken larger than. That is, as is clear from FIG. 3A, when the "maximum body diameter D1 of the inner container 20" is larger than the "opening diameter D2 of the drinking spout of the container", the inner container 20 is larger than the outer container 30. It is possible to insert only from the lower side.
As a result, it is possible to reduce the opening diameter D2 of the drinking spout and realize the compactness of the entire container, while increasing the internal capacity by the larger the maximum body diameter D1 of the inner container 20.

In addition, a structure in which the portion above the maximum body diameter portion (the portion indicated by X in FIG. 3A) of the outer container 30 is composed of a member separate from the portion below the maximum body diameter portion and is welded and fixed later. If adopted, the inner container 20 can be inserted from above the outer container 30 even if the "maximum body diameter D1 of the inner container 20" is larger than the "opening diameter D2 of the drinking port of the container". However, such a configuration is not preferable because the number of parts increases and the manufacturing process becomes complicated.
In the present invention, since the inner container 20 is inserted from the bottom side of the outer container 30 to manufacture a double-walled container, the portion indicated by X in FIG. 3A is composed of a (seamless) integral body. Even in this case, the "maximum body diameter D1 of the inner container 20" can be configured to be larger than the "opening diameter D2 of the drinking port of the container". That is, the number of parts can be kept small and the manufacturing process can be simplified.
In the illustrated example, the outer container 30 has an upper end opening peripheral edge portion 31 from the outer peripheral wall including the maximum body diameter portion (the portion indicated by X in FIG. 3 (a)) via the shoulder portion 36 and the male screw portion 35. The part leading to is composed of an integral body without a joint.

<Modification example>
In the modified example shown in FIG. 4B, the outer peripheral wall portion 21b of the curved folded-back portion 21 of the inner container 20 and the upper end opening peripheral edge portion 31 of the outer container 30 are reduced in diameter as they go upward. That is, in FIG. 4B, which is a cross-sectional view, the slope is inclined toward the left side as it goes upward.
If such a configuration is adopted, when the curved folding portion 21 approaches the upper end opening peripheral edge portion 31 from below, a kind of centering function (or guide function) is exhibited, and the inner container 20 and the outer container 30 are exhibited. The alignment function is exhibited for the relative position in the height direction of.
In the illustrated example, both the outer peripheral wall portion 21b and the upper end opening peripheral edge portion 31 are reduced in diameter toward the upper side, but the same effect can be obtained if only one of them is reduced in diameter.

<Other features>
In particular, as can be clearly seen from FIG. 4, in the illustrated embodiment, a curved folding portion 21 (particularly, a curl portion 21a) is provided on the side of the inner container 20 constituting the double-walled container, and a male screw is provided on the side of the outer container 30. A unit 35 is provided. The male screw portion 35 engages with a female screw portion provided on the lid member (not shown) side that closes the spout of the double-walled container.
The curl portion 21a has the effect of smoothing the mouthfeel by providing it at the mouthpiece of the container, but when the screw portion is provided on the same side of the inner container 20 as the curl portion 21a, the curl portion is deformed. There is a concern that the smoothness of the mouthfeel may be impaired, or that the welding accuracy between the inner container 20 and the outer container 30 may be reduced.
In the illustrated embodiment, since the male screw portion 35 is provided on the side of the outer container 30 (not the inner container 20), the above inconvenience can be avoided.

<Others>
In the double-walled container formed by connecting the inner container and the outer container, as shown in the enlarged view in FIG. 1 (b), the wall thickness of the inner container is relatively thin, and the thickness of the outer container is relatively thin. It is common to increase the wall thickness. In the case of adopting such a general wall thickness relationship, if the inner container 20 is provided with the curl portion 21a as in the present invention, the following advantages can be obtained.
That is, since the curl portion 21a is formed on the inner container 20 side of the thin wall, the amount of heat that escapes to the outside through the curl portion 21a from the contents that are in direct contact with the inner container 20 can be suppressed to a small amount (by the amount of the thin wall), resulting in a result. Insulation performance (heat retention / cold retention performance) can be improved.
Moreover, although the inner container 20 is thin, the strength is improved by providing a curled portion therein. That is, it is possible to improve the strength against external pressure while improving the heat insulating performance (heat retention / cold retention performance) as described above.

10 Double-walled container 20 Inner container 21 Curved folding part 21a Curl part 21b Outer wall part 30 Outer container 35 Male screw part 36 Shoulder part 37 Bottom member

Claims (5)

A double-walled container with a space between the inner container and the outer container.
The inner container is thinner than the outer container, and has a curved folding part with an arc-shaped cross section, which is curved outward at the upper end and folded downward while curling .
The peripheral edge of the upper end opening of the outer container, which is thicker than the inner container, contacts the outer side in the radial direction of the curved folding part of the inner container, and the inner container and the outer container are connected by welding at the contact point. , Double wall container. The double according to claim 1, wherein at least one of the upper end opening peripheral edge portion of the outer container and the outer peripheral wall portion of the curved folding portion in contact with the upper end opening peripheral edge portion is reduced in diameter toward the upper side of the container. Wall container. The double-walled container according to claim 1 or 2, wherein the maximum body diameter of the inner container is larger than the opening diameter of the upper end opening peripheral portion of the outer container. The double container according to claim 3, wherein at least a portion from the outer peripheral wall including the maximum body diameter portion to the upper end opening peripheral edge portion is made of an integral body without a joint portion. The double according to any one of claims 1 to 4, wherein the outer container is formed with a screw engaging portion that engages with a screw engaging portion formed on the lid member of the double wall container. Wall container.

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