JP2019089570A - Double wall container - Google Patents

Abstract

To provide a double wall container which includes a suitable structure for the double wall container in which a drink opening is made to be relatively small by prioritizing a heat insulation property, and which has high convenience in a manufacturing process, while maintaining inner capacity relatively large.SOLUTION: In an inner container 20 of a double wall container 10, a bent folding part 21 is provided in which an upper end is bent outward and folded downward. An upper end opening peripheral edge part 31 of an outer container 30 comes into contact with the radially outside of the bent folding part 21 of the inner container, and at the contact place, the inner container and the outer container are connected and fixed by welding. In a manufacturing process, the double container with this constitution is convenient for inserting the inner container from below and connecting both of them in a state where the bottom part of the outer container is opened. As the inner container is inserted from below with respect to the outer container, a maximum barrel diameter part of the inner container can be larger than an upper part opening diameter of the outer container. As a result, while the container is slim in which the opening of a drink opening is relatively small, it can secure relatively large inner capacity.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a double-walled container configured by connecting an inner container and an outer container and in which a space is provided.

  Conventionally, various double-walled containers configured by connecting an inner container and an outer container are known (for example, Patent Documents 1 to 4). The space between the double walls is preferably at or near vacuum, which enhances the insulation of the container.

  In the double-walled container disclosed in Patent Documents 1, 2 and 3, the welding points and threads for connecting and fixing the inner and outer containers are the sides of the inner container (ie, the inner peripheral surface of the double wall) Exist in). On the other hand, in the double-walled container of Patent Document 4, if a screw or the like is present on the inner peripheral surface, soup or the like adheres and it becomes unsanitary, the screw thread and the welding point are formed on the outer container side It is done.

  The double-walled container was originally designed to provide a space between the double-walled members, thereby enhancing the heat insulation, and from the viewpoint of the heat insulation, the upper opening (opening for the spout) of the container Should be narrow. However, in patent document 4, since the soup with high viscosity is made into accommodation object, the structure which enlarges an opening is employ | adopted, even if it insulates a certain degree of heat insulation. On the other hand, in the case where a drink having a viscosity not as high as that of a soup (for example, sports drink, coffee, tea, etc.) is targeted, it is preferable to give top priority to heat insulation and narrow the opening of the spout. In that case, in order to secure a large capacity as much as possible, it is preferable to make the largest barrel diameter portion of the inner container larger than the opening diameter of the mouth of the container.

Patent No. 6039255 JP, 2014-000261, A JP 2014-000262 A JP, 2016-116628, A

  An object of the present invention is to provide a double-walled container having a relatively small mouth by giving priority to heat insulation, and having a structure suitable for maintaining a relatively large internal volume, and also having high convenience in the manufacturing process. It is to provide a container.

Means for Solving the Problems and Effects of the Invention

  According to the present invention, a double-walled container is provided with the following features. That is, the double-walled container of the present invention is provided with a space between the inner and outer containers, and the inner container is provided with a bent portion at which the upper end is bent outward and turned back downward. There is. Then, the upper end opening peripheral portion of the outer container contacts the radial outside of the bent 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 inserting the inner container from the lower side and assembling the both in the manufacturing process with the bottom of the outer container opened. This is because the upper opening peripheral edge of the outer container contacts the radially outer side with respect to the bent portion of the inner container approaching from below, a kind of positioning effect (or alignment effect) can be obtained It is from.

In the present invention, it is preferable that at least one of the upper end opening peripheral portion of the outer container and the outer peripheral wall portion of the bent portion which is in contact with the upper end opening peripheral portion decreases in diameter toward the upper side of the container.
When such a configuration is adopted, the above-mentioned positioning effect (or alignment effect) is further enhanced. Furthermore, since the alignment function is exhibited also with respect to the relative position in the height direction of the inner container and the outer container, the manufacturing accuracy can be enhanced by the simple control.

In the present invention, the maximum barrel diameter of the inner container is preferably configured to be larger than the opening diameter of the upper end opening peripheral portion of the outer container. When the said structure is employ | adopted, the internal volume of a container can be taken comparatively large, restraining the opening diameter of the upper opening (opening) of a double walled container small.
Furthermore, in this case, it is preferable that at least a portion from the outer peripheral wall including the largest torso diameter portion to the upper end opening peripheral portion be an integral body without a joint portion. Thereby, it can suppress that the number of parts which comprises a double walled container increases, and can reduce manufacturing cost.

In the present invention, it is preferable that a screw engagement portion that engages with a screw engagement portion formed on the lid member of the double-walled container is formed on the outer container.
When such a configuration is adopted, the bent portion is separately formed on the inner container side, and the screw engagement portion is separately formed on the outer container side. The curled portion of the bent portion has the effect of smoothing the mouthfeel by providing it at the mouth of the container, but a screw engagement portion is formed on a member (outer container) other than the curled portion. Thus, the curled portion can be prevented from being deformed during the formation of the screw. That is, it is possible to avoid the disadvantage that the smoothness of the mouth feel is lost or the welding accuracy between the inner container and the outer container is lowered.

Sectional drawing explaining the structure of the double walled container which concerns on one Embodiment of this invention. The figure which shows the inner container in FIG. 1, and an outer container independently, respectively. The figure explaining the manufacturing process of the double-walled container of FIG. The figure explaining the modification with respect to the double-walled container of FIG. 1, and a comparative example.

  Embodiments of the present invention will be described with reference to the accompanying drawings. FIG. 1 shows the structure of a double-walled container 10 according to an embodiment of the present invention (the illustration of a lid member for closing the spout is omitted). FIG. 1A is a half sectional view of the double-walled container 10. FIG. 1 (b) is a full cross-sectional view, showing a partially enlarged view of the area A in the vicinity of the opening of the spout.

  Further, FIG. 2 (a) shows the inner container 20 constituting the double-walled container 10, and FIG. 2 (b) shows the outer container 30 alone. In the double-walled container 10, a space is formed between the inner container 20 and the outer container 30, thereby enhancing heat insulation. The above basic configuration itself is conventionally known.

  As shown to Fig.2 (a), the inner container 20 is equipped with the curve return part 21 at the upper end. The bent portion 21 includes a curled portion 21a that is bent downward while being curled outward in the radial direction, and an outer peripheral wall portion 21b that extends downward from the curled portion 21a.

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

As shown partially enlarged in FIG. 1 (b), the upper end opening peripheral edge 31 of the outer container 30 contacts the radially outer side of (the outer peripheral wall 21 b of) the bent portion 21 of the inner container 20. At the contact point, the inner container 20 and the outer container 30 are connected and fixed by welding. The configuration is one of the important features of the present invention, which brings about various benefits described below.
That is,
(A) First, the inner container 20 is inserted from the bottom of the outer container 30, and it becomes possible to smoothly carry out the manufacturing process of finally connecting and fixing the both.
(B): By adopting the manufacturing process, the maximum barrel diameter D1 of the inner container 20 can be made larger than the upper opening diameter D2 of the outer container 30 without increasing the number of parts (see FIG. 3). As a result, it is possible to secure a relatively large internal volume while being a slim container with a relatively small opening of the spout.
The following will be described in order.

(A) The configuration in which the upper end opening peripheral portion 31 of the outer container 30 contacts the radially outer side of (the outer peripheral wall portion 21b of the bent portion 21 of the inner container) inserts the inner container 20 from the bottom of the outer container 30 It is an aspect suitable for the manufacturing process. This will be described with reference to FIGS. 3 and 4.
The manufacturing process which penetrates the inner container 20 from the downward direction in the state which opened the bottom part of the outer container 30 in the order shown to FIG. 3 (a)-(c) is demonstrated. In these series of steps, as shown in an enlarged manner in FIG. 4A, the bent portion 21 of the inner container 20 approaches the upper opening peripheral edge portion 31 of the outer container 30 from below. At this time, the upper end opening peripheral portion 31 relatively approaches the bent portion 21 from above.
In this case, if the upper end opening peripheral portion 31 contacts (the outer peripheral wall portion 21b of) the curved turning portion 21 from the outer peripheral side, the curved upper turning peripheral portion 31 present on the outer peripheral side enters the inside thereof Since the alignment function (alignment function) can be exhibited with respect to 21, the contact between the two can be completed smoothly. And it can shift to welding (fixing) after that smoothly.
On the contrary, as shown in the comparative example of FIG. 4C, when trying to insert the inner container 20 into the outer container 30 from the upper side, (the outer peripheral wall 21b thereof) and the upper end opening peripheral portion The relative alignment with 31 is difficult, and both interfere with each other, which may increase the possibility of preventing smooth connection (unfavorably).

(A) When the manufacturing process of inserting the inner container 20 from the bottom side of the outer container 30 is adopted, the maximum barrel 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 outlet). You can get bigger than that. That is, as apparent from FIG. 3A, when the “maximum barrel diameter D1 of the inner container 20” is larger than the “opening diameter D2 of the outlet of the container”, the inner container 20 is opposed to the outer container 30. It is possible to insert only from the lower side.
As a result, while the opening diameter D2 of the spout is reduced to realize the compactness of the entire container, it is possible to increase the internal volume by the amount corresponding to the largest trunk diameter D1 of the inner container 20.

The upper part of the outer container 30 is constructed separately from the lower part than the largest part (the part shown by X in FIG. 3A) from the lower part than that and is welded and fixed later. If employed, even if the “maximum barrel diameter D1 of the inner container 20” is larger than the “opening diameter D2 of the outlet of the container”, the inner container 20 can be inserted from above the outer container 30. 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 shown by X in FIG. Even in this case, the “maximum barrel diameter D1 of the inner container 20” can be configured larger than the “opening diameter D2 of the mouth of the container”. That is, the number of parts can be reduced and the manufacturing process can be simplified.
In the illustrated example, the outer container 30 passes the shoulder 36 and the male screw 35 from the outer peripheral wall including the largest torso diameter (the point indicated by X in FIG. 3A), and the upper opening peripheral edge 31 The part leading to is composed of a single piece without a joint.

<Modification>
In the modification shown in FIG. 4 (b), the outer peripheral wall 21 b of the bent portion 21 of the inner container 20 and the upper end opening peripheral portion 31 of the outer container 30 decrease in diameter toward the upper side. That is, in FIG. 4B, which is a cross-sectional view, it is inclined toward the left as it goes upward.
By adopting such a configuration, when the bent portion 21 approaches the upper end opening peripheral portion 31 from below, a kind of alignment function (or guide function) is exhibited, and the inner container 20 and the outer container 30 The alignment function is exhibited with respect to the relative position in the height direction of the lens.
In the illustrated example, although both the outer peripheral wall 21b and the upper end opening peripheral portion 31 decrease in diameter toward the upper side, the same effect can be obtained if only at least one of them is reduced in diameter.

<Other features>
As can be clearly seen from FIG. 4 in particular, in the illustrated embodiment, a bent portion 21 (especially the curled portion 21a) is provided on the side of the inner container 20 constituting the double-walled container, and an external thread is provided on the outer container 30 side. The part 35 is provided. The male screw portion 35 engages with a female screw portion provided on the side of a lid member (not shown) for closing the spout of the double-walled container.
The curled portion 21a has an effect of smoothing the mouth contact by providing it at the mouth of the container, but when the screw portion is provided on the same side of the inner container 20 as the curled portion 21a, the curled portion is deformed There is a concern that the smoothness of the mouth feel may be impaired, or the welding accuracy between the inner container 20 and the outer container 30 may be reduced.
In the illustrated embodiment, the male screw portion 35 is provided on the side of the outer container 30 (instead of the inner container 20), so that the above problems can be avoided.

<Others>
In the double-walled container configured by connecting the inner container and the outer container, the thickness of the inner container is relatively thin, as shown in the enlarged view in FIG. It is common to increase the wall thickness. In the case of adopting such a general thickness relationship, providing the curled portion 21a in the inner container 20 as in the present invention provides the following advantages.
That is, since the curled portion 21a is formed on the thin inner container 20 side, the amount of heat released from the contents in direct contact with the inner container 20 to the outside through the curled portion 21a can be reduced (by the thin portion). As heat insulation performance (heat retention · cold storage performance) can be enhanced.
And although the inner container 20 is thin-walled, intensity | strength improves by providing the part which curled to this. That is, it is possible to improve the strength against external pressure while improving the heat insulation performance (heat retention / cool storage performance) as described above.

DESCRIPTION OF SYMBOLS 10 double-walled container 20 inner container 21 curved folding part 21a curled part 21b outer peripheral wall 30 outer container 35 male screw 36 shoulder 37 bottom member

Claims (5)

A double-walled container comprising a space between an inner container and an outer container, wherein
The inner container is provided with a bent portion which is bent upward at the upper end and bent downward.
A double-walled container, wherein the upper open peripheral edge of the outer container contacts the radially outer side of the bent portion of the inner container, and the inner container and the outer container are connected by welding at the contact point.   The double according to claim 1, wherein at least one of the upper end opening peripheral portion of the outer container and the outer peripheral wall portion of the bent portion which the upper end opening peripheral portion contacts contact shrinks toward the upper side of the container. Wall container.   The double-walled container according to claim 1 or 2, wherein the maximum barrel 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 largest barrel diameter portion to the upper opening opening peripheral portion is 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 engagement portion which engages with a screw engagement portion formed on a lid member of the double-walled container. Wall container.

Images