JP2003034368A - Insulated double container - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat-insulating double container in which a paper sleeve 3 is wound around and adhered to the outer periphery of a body part of a synthetic resin inner container 1 after pouring hot water or heating in a microwave oven. Makes it hard to feel the heat of your fingertips when you hold it. SOLUTION: A number of grooves 4 are provided at equal pitches in a longitudinal direction of a body outer peripheral surface of an inner container 1, and at a pitch different from the grooves 4 in a longitudinal direction of an outer peripheral surface of a sleeve 3; A number of convex ruled lines 7 are provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to, for example, a packaging container for instant foods prepared by pouring hot water, and a packaging container for containing liquid foods, frozen foods, etc., which are directly subjected to heating in a microwave oven. The present invention relates to a heat insulating double container.

[0002]

2. Description of the Related Art Conventionally, as a heat insulating double container, an outer container made of paper is wrapped around and adhered to the outer periphery of the body of an inner container made of synthetic resin. In order to prevent heat from being transferred to the surface (the outer peripheral surface of the body of the outer container), a large number of grooves are provided at a fixed pitch and an air layer is interposed between the inner container and the outer container. In the vertical direction of the inner peripheral surface of the body of the outer container, a large number of ribs are provided at a pitch different from that of the concave groove so that the air layer between the inner container and the outer container can be further increased. (JP 20
00-219280).

[0003]

However, the above-mentioned conventional heat-insulating double container is apt to feel the heat at the fingertips when it is held in the hand and has poor handleability after pouring hot water or after heating by a microwave oven. There is. The cause is that the outer peripheral surface of the body of the outer container in the conventional heat insulating double container is flat,
It is considered that when held in the hand, the fingertips come into contact with a large area with substantially equal pressure. The rib provided on the inner peripheral surface of the body of the outer container is for expanding the air layer between the inner container and the outer container, as described above.
As is clear from FIG. 8 of Japanese Patent Laid-Open No. 219280, it is provided with a narrow width and a coarse pitch, and does not actively reduce the contact area of the fingertip.

By the way, according to the knowledge of the present inventors, the heat felt at the fingertip is greatly influenced by the contact pressure and the contact area. The larger the both are, the more the heat is felt, and the smaller the both are, the less the heat is felt. .

The present invention is based on the above-mentioned findings of the present inventors, and an object thereof is to provide a heat-insulating double container in which it is difficult to feel the heat at the fingertips when held after being poured into boiling water or after being heated in a microwave oven. To do.

[0006]

To this end, the present invention provides a heat-insulating double container in which a sleeve made of paper is wrapped around and adhered to the outer periphery of the body of an inner container made of synthetic resin. A large number of concave grooves are provided at equal pitches in the vertical direction of the surface, while a large number of convex ruled lines are provided at a different pitch from the concave grooves in the vertical direction of the outer peripheral surface of the sleeve. The present invention provides a heat-insulating double container characterized by the above.

In the above invention, the ruled line has a width of 0.5 to 3 m.
m, a height of 25 to 100 μm, and provided at a pitch smaller than the concave groove, the concave groove of the inner container has a width of 4 to 7 mm,
The depth is 1 to 2 mm, the distance between adjacent grooves is smaller than the width of the grooves, and the lower end of the sleeve is 1 mm lower than the lower end of the inner container.
-20 mm downward projection is included as a preferable mode.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION An example of the present invention will be described with reference to FIGS.

FIG. 1 is a perspective view of a heat-resistant double container according to the present invention, FIG. 2 is a longitudinal sectional view thereof, FIG. 3 is a perspective view of an inner container, and FIG.
Is a plan view of the inner container, and FIG. 5 is a perspective view of the sleeve.
In the figure, the broken line leading line indicating the designated position of the reference numeral indicates the back side of the designated position.

As shown in FIGS. 1 and 2, the heat-resistant double container of the present invention comprises a sleeve 3 wound around an outer peripheral surface of a body 2 of an inner container 1 and attached thereto.

The inner container 1 has a cup-like shape made of a heat-resistant synthetic resin such as polypropylene or polyester, and a large number of recessed grooves 4 are vertically provided on the outer peripheral surface of the body portion 2. Has been done. The groove 4 forms an air layer between the groove 3 and the sleeve 3, and when hot water is injected into the inner container 1 or the contents in the inner container 1 are heated by a microwave oven,
This is to prevent the heat from being transmitted to the sleeve 3. Further, the concave groove 4 is formed by bulging the corresponding portion inward, and also serves as a rib for reinforcing the inner container 1.

The concave grooves 4 are formed at equal pitches in the circumferential direction. The concave groove 4 has a width of 4 to 7 mm and a depth of 1 due to the heat insulating function by forming the air layer and the function as a reinforcing rib.
It is preferably ˜2 mm. Further, it is preferable that the interval between the adjacent grooves 4 is smaller than the width of the grooves 4 so that the heat insulation effect by the air layer can be obtained over as wide a range as possible. Specifically, the distance between the adjacent concave grooves 4 is 1 to
It is preferably 10 mm.

As shown in FIGS. 2 and 4, it is preferable that the lower end of the concave groove 4 extends around the bottom portion 5 of the inner container 1. By wrapping the lower end of the groove 4 around the bottom 5 of the inner container 1, the bottom 5 can be reinforced.

It is preferable that a portion of the concave groove 4 has a stepped portion at a lower portion to have a deep depth. As described above, the concave groove 4 is formed by bulging the corresponding portion inward, and the stepped portion 6 is formed on the inner surface of the inner container 1 by changing the depth with a step. can do. If the step portions 6 are formed in the lower portion of the inner container 1 so as to face each other, they are stacked, for example, in an automatic filling and packaging device when a large number of the heat insulating double containers are taken out from the stacked state and packaged. It is possible to prevent supply failure due to stacking of the present heat resistant double container.

The sleeve 3 is made of paper, and is wound around the outer peripheral surface of the body 2 of the inner container 1, the ends of which are adhered together, and the inner container 1 is also adhered at least at one place. For the adhesion of the sleeve 3, for example, a water-soluble adhesive containing a polyolefin resin or a hot melt adhesive can be used.

A large number of convex ruled lines 7 are provided in the longitudinal direction of the outer peripheral surface of the sleeve 3. The ruled lines 7 are formed by embossing, and the outer surface of the sleeve 3 is separated from the outer peripheral surface of the body of the inner container 1 and is strongly touched by a fingertip when the heat insulating double container is held in the hand. This is to reduce the area. More specifically, as described above, the heat felt at the fingertip is greatly affected by the contact pressure and the contact area. The larger the both, the more easily the heat is felt, and the smaller both, the less heat is felt. When the ruled lines 7 are provided, the fingertips make strong contact only near the tops of the ruled lines 7, and even if a part of the fingertips touches the recesses between the ruled lines 7, the contact pressure is weak. Therefore, the heat felt by the fingertips is reduced as a whole, and it becomes easy to prevent the heat from being lost or being lost due to the heat.

The ruled lines 7 of the inner container 1 are arranged so that at least a part of the ruled lines 7 can be surely positioned on the concave groove 4 of the inner container 1 even if the sleeve 3 is randomly wound. It is formed at a pitch different from that of the concave grooves 4. The pitch of the ruled lines 7 is preferably smaller than the pitch of the concave grooves 4 in order to reduce the area of the fingertip that is in strong contact with the outer peripheral surface of the sleeve 3, and specifically, it is preferably 1 to 9 mm. If the pitch of the ruled lines 7 is too small, the inner container 1
If the pitch of the ruled lines 7 is too large, the fingertips are likely to come into strong contact with the recesses between the ruled lines 7 if the pitch between the ruled lines 7 is too large.

The ruled line 7 has a width of 0.5 to 3 mm and a height of 25 to
It is preferably 100 μm. If the width is too narrow, it is difficult to obtain the required height, and if the width is too wide, it is difficult to reduce the area where the fingertips make strong contact. Further, if the height is too low, the fingertips are likely to come into strong contact with the concave portions between the ruled lines 7,
If the height is too high, the printing applied to the outer peripheral surface of the sleeve 3 tends to be disturbed.

The lower end of the sleeve 3 preferably projects 1-20 mm below the lower end of the inner container 1. By doing so, the bottom part 5 of the inner container 1 can be floated from the mounting surface, especially when heated in a microwave oven, and the vicinity of the bottom part 5 is less likely to be heated intensively, and thus is heated uniformly. be able to.

As shown in FIGS. 1 and 5, the ruled line 7 in this embodiment is formed on the entire surface of the sleeve 3 except for the vicinity of the bonding margin of the end of the sleeve 3 and the upper and lower end edges. For example, as shown in FIG. 6A, the ruled line 7 may be formed by being offset to the upper side of the sleeve 3.
Contrary to (a), the ruled line 7 may be formed by shifting to the lower side of the sleeve 3. Further, the ruled lines 7 may be formed by being divided into a plurality of groups as shown in FIG.
As shown in (c), ruled lines 7 having different lengths can be mixed. When the ruled lines 7 are formed by being divided into a plurality of groups, it is sufficient that the pitch of the ruled lines 7 is satisfied in each group. By selecting the formation pattern of the ruled lines 7, it is possible to improve the design of the present heat resistant double container.

[0021]

The present invention is as described above,
The ruled line 7 formed on the sleeve 3 reduces the area of the fingertip that is in strong contact, so that the heat felt by the fingertip when held by hand after pouring hot water or after heating in a microwave oven is reduced, making it impossible to hold the heat. It can be prevented from being dropped or dropped.

[Brief description of drawings]

FIG. 1 is a perspective view showing an example of a heat-resistant double container according to the present invention.

FIG. 2 is a vertical sectional view of the heat resistant double container shown in FIG.

FIG. 3 is a perspective view of an inner container.

FIG. 4 is a plan view of an inner container.

FIG. 5 is a perspective view of a sleeve.

FIG. 6 is a development view of a sleeve showing a ruled line forming pattern.

[Explanation of symbols]

1 inner container 2 torso 3 sleeves 4 groove 5 bottom 6 steps 7 ruled lines

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Tatsuo Miyabe             4-14-12 Koishikawa, Bunkyo-ku, Tokyo Jointly             Printing Co., Ltd. F-term (reference) 3E061 AA26 AB09 AD07 DA02 DA13                       DB01                 3E062 AA10 AB14 AC02 BB02 BB10                       JA04 JA08 JB14 JB27 JC02                       JD04                 3E067 AA04 AA11 AB01 BA17B                       BA17C BB01C BB14B BB16B                       CA17 FA04 GA12

Claims (4)

[Claims] 1. A heat-insulating double container in which a sleeve made of paper is wrapped around and adhered to the outer circumference of the body of a synthetic resin inner container, wherein a large number of aforesaid outer circumferences of the inner container are provided at equal pitches in the longitudinal direction. While the concave groove is provided, in the longitudinal direction of the outer peripheral surface of the sleeve,
A heat insulating double container characterized in that a large number of convex ruled lines are provided at a pitch different from that of the groove. 2. The ruled line has a width of 0.5 to 3 mm and a height of 25 to
The heat insulating double container according to claim 1, wherein the double container is 100 μm and is provided at a pitch smaller than the concave groove. 3. The groove of the inner container has a width of 4 to 7 mm and a depth of 1.
The heat-insulating double container according to claim 1 or 2, wherein the distance between adjacent concave grooves is smaller than the width of the concave grooves by about 2 mm. 4. The lower end of the sleeve is 1 mm lower than the lower end of the inner container.
The heat-insulating double container according to any one of claims 1 to 3, which projects downward by -20 mm.