Insulating container

Details Insulating container Insulating container

2000-01-19

2001-02-27

Moy, Joseph M. (Department: 3727)

Receptacles

Receptacle having means to facilitate maintaining contents...

For a beverage

C229S403000

Reexamination Certificate

active

06193098

ABSTRACT:

TECHNICAL FIELD
The present invention relates to a heat-insulating container made of paper, which is used for an instant dried food to be become eatable by pouring boiling water over it or food to be heated or cooked by means of a microwave oven.
BACKGROUND ART
As a heat-insulating container made paper mainly used for instant dried Chinese noodles, there has widely been used a container in which a paper cup body surrounded over its outer periphery with a heat-insulating corrugated member having narrow projections and recesses arranged alternately.
The heat-insulating member of the heat-insulating container has the above-mentioned irregularity so that characters, designs or the like printed on its surface appear extremely unclearly, thus making it impossible to give the high-grade appearance of design to the container.
In Japanese Patent Provisional Publication No. H8-113274, there is proposed a heat-insulating container in which the width of the recesses of the heat-insulating member is made smaller than that of the projections so that the total area of clearly visible portions on the outer periphery of the container is increased. However, the recesses appearing on the outer periphery of the container do not provide complete solution of the above-mentioned problems.
In Japanese Patent Provisional Publication No. S49-87479, Japanese Patent Provisional Publication No. H4-45216 and Japanese Patent Provisional Publication No. H8-104373, there is proposed a heat-insulating container, in which a heat-insulating member subjected to a corrugating process or an embossing process is surrounded with a liner or a shin sheet of paper so that no irregularity is formed on the outer surface of the container. Such a container can solve the problems of the appearance on its outer periphery. However, the bottom of the heat-insulating container may have irregularity in the joined portions of the heat-insulating member and the liner. When observation from the bottom side of the container is made, the edge of the corrugated or embossed heat-insulating member appears through a gap formed in the bottom of the container. Dirt or liquid may enter the gap of the bottom of the container, thus causing insanitary problems. The additional liner provides an increased production cost.
In Japanese Utility Model Provisional Publication No. 4-45212, there is proposed a heat-insulating container in which a heat-insulating property is ensured without using any heat-insulating member having irregularity. The heat-insulating container has for example a construction as shown in FIG.
11
. More specifically, the heat-insulating container
100
is provided with a paper cup body
101
having a bottom plate
102
and a side shell-wall
103
and with a tubular member
105
arranged on the outer periphery of the side shell-wall
103
. The paper cup body
101
and the tubular member
105
come on their opposite edges into contact with each other to be joined with each other into an integral body. The side shell-wall
103
is provided on its upper edge with an inward curled portion
104
. The tubular member
105
is provided on its lower edge with an inward curled portion
106
. A heat-insulating space corresponding to the thickness of the curled portion
106
is formed between the side shell-wall
103
and the tubular member
105
.
Such a heat-insulating container
100
does not use any specific heat-insulating member having irregularity and has therefore no disadvantage caused by the heat-insulating member. When the container is actually held at the central portion of the side shell-wall thereof with a hand, the tubular member may however easily be deformed inward to decrease the capacity of the heat-insulating space, thus deteriorating the heat-insulating property.
DISCLOSURE OF INVENTION
An object of the present invention, which was made in order to solve the above-mentioned problems, is to provide a heat-insulating container, which has a stable heat-insulating property, a high grade design, a high degree of freedom in indication by printing on the outer surface of the container, and a lower production cost.
In order to attain the above-described object, the heat-insulating container according to an embodiment of the present invention comprises:
a paper cup body having an inner surface, an upper open end, a shell member and a bottom, said inner surface being coated with polyolefine resin, said upper open end having an outward curled portion and said shell member having a side wall on which at least one rib is formed; and
a tubular member being formed of paper and having an inverse truncated conical shape, said tubular member having at a lower end thereof an inward curled portion;
said tubular member being combined with an outer periphery of said paper cup body so as to come into contact with said paper cup body in contact portions provided on said at least one rib of said paper cup body and on an outer periphery of an lower end of said side wall of said shell member.
In the heat-insulating container of the present invention, the tubular member may be adhesively joined to the paper cup body in at least one of the contact portions. The rib may continuously extend over the entire periphery of the side wall of the shell member of the paper cup body, or intermittently extend along the periphery of the side wall of the shell member of the paper cup body. The inward curled portion formed on the lower end of the tubular member may be adhesively joined to the side wall of the shell member of the paper cup body. The rib may have a shape in a vertical cross section so that an inclination angle of an upper portion of the rib locating above a peak of the rib relative to a vertical line passing through the peak is smaller than an inclination angle of a lower portion of the rib locating below the peak relative to the vertical line. The tubular member has a rib, which projects inward so as to face the rib of the paper cup body.
The heat-insulating container according to the other embodiment of the present invention comprises:
a paper cup body having an inner surface, an upper open end and a bottom, said inner surface being coated with polyolefine resin and said upper open end having an outward curled portion; and
a tubular member being formed of paper and having an inverse truncated conical shape, said tubular member having at a lower end thereof an inward curled portion;
said tubular member being combined with an outer periphery of said paper cup body so as to form a heat-insulating space between an outer surface of a side wall of a shell member of said paper cup body and an inner surface of said tubular member,
said tubular member being provided with two handle-shaped pieces each of which is defined by at least one folding line and at least one cutting line that is formed by punching a side wall of a shell member of said tubular member, and
said handle-shaped pieces being capable of extending outward from the side wall of the shell member of said tubular member to form handles on an outer periphery of said tubular member, by folding said handle-shaped pieces along said at least one folding line so as to face each other.
According to such a heat-insulating container, it can be held safely with hand even when the temperature of the outer wall becomes high due to the deteriorated heat-insulating property.
Each of the at least one cutting line may have at least one connection portion, which can easily be cut off. Each of the handle-shaped pieces may have on its peripheral portion a cutout. The side wall of the shell member of the paper cup body may have at least one rib extending outward or inward. When a sheet of paper of which the tubular member is formed has a basic weight of up to 270 g/m
2
, the at least one rib preferably extends outward. The at least one cutting line may comprise a single cutting line that is provided in an outer peripheral portion of each of the handle-shaped pieces; and the at least one folding line may comprise a single folding line that extends so as to connect opposite ends of the single cutting line to each

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