JP2000007058A - Heat-insulating container - Google Patents

Abstract

PROBLEM TO BE SOLVED: To supply a heat-insulating container for instant food wherein heat insulating properties are good on an entire body of the container, the container is free from liquid leakage, physically and hygienically excellent in safety, and excellent also in design and economy. SOLUTION: A paper cylinder 20 of an inverted truncated cone shape having an inward curl 6 at a lower end is fitted to cover a plastic container body 10 of an inverted truncated cone shape having a flange 3 at an upper opening rim and having a body side wall 1 formed with an outward protrusion 4 and a bottom plate 2, so that the protrusion 4 is brought into contact with the cylinder 20. In addition, the inward curl 6 is brought into contact with the body side wall 1 thereby providing the heat-insulating container 30 formed with a heat-insulating space A.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bowl-shaped insulated container used for instant foods cooked by pouring boiling water, foods cooked in a microwave oven, and the like.

[0002]

2. Description of the Related Art Conventional heat-insulated containers for instant foods are classified into plastics and papers. A typical example of a plastic heat-insulating container is a molded container made of styrofoam used for instant noodles, miso soup and the like. Further, there has been proposed an insulated container in which a plastic gap formed by two sheet moldings is double-fitted to form a space in a side wall. On the other hand, a typical paper-based heat-insulating container is one in which a paper-made cylindrical body having an uneven cross-sectional shape is wound around the outer periphery of a body of a paper cup body also used for instant noodles or the like as a heat insulating material. is there. Further, Japanese Utility Model Laid-Open No. 4-45212 proposes a heat insulating container in which a paper cylindrical body (sleeve) having a curl at the bottom is inserted into a side wall of a paper cup main body and is brought into contact with each other at an upper portion to form a space gap. Has been made.

[0003]

However, in addition to the above-mentioned plastic-based ones, in addition to environmental problems in disposal, some of the plastics have environmental hormones (exogenous endocrine disrupters) that elute from the container in the hot water injected. Chemical substances) have been raised. Furthermore, for direct printing on the surface, we must rely on curved surface printing after molding, and the printing effect is sharper, more resolving power than paper containers with no irregularities on the surface.
There is a much lower problem in terms of productivity and the like. On the other hand, in the case of a paper-based heat-insulating container, although the environmental problem is reduced, there is a problem that the degree of freedom of moldability is poor and the shape of each part of the container body cannot be arbitrarily formed. In addition, with regard to the paper insulation container having an uneven cross-sectional shape on the surface described above, the degree of freedom of printing is most constrained, fine characters are difficult to see, only monotonous and rough printing can be performed, and in terms of design, But there is a problem. In addition, pinholes are generated on the inner surface only by the thin polyethylene resin layer, and there is a problem that it is difficult to hold foods accompanied by liquid juice for a long time. The present invention has been made in view of the above-mentioned problems, and has a stable heat insulating property over the entire body side wall touched by hand, has a high degree of freedom in printing, has excellent design properties, and is excellent in design of foods with liquid juice. An object of the present invention is to provide a heat-insulating container having good holding properties.

[0004]

According to the present invention, there is provided an insulated container having a flange at an upper opening edge and an outwardly projecting portion formed at at least one horizontal level. An inverted truncated cone shaped plastic container body having a side wall and a bottom plate, and an inverted truncated cone shaped paper tubular body having an inward curl portion at a lower end, wherein the tubular body is the plastic container. Fitted to cover the body side wall of the main body, the protruding portion abuts the cylindrical body,
The heat-insulating space is formed by the inward curl part being in contact with the body part side wall. The protrusion may be a horizontal rib, a step, or a combination of a horizontal rib and a step. The horizontal rib may be provided so as to be continuous or to go around the body side wall of the tubular body. Furthermore, it is possible to provide an insulated container in which at least one of the places where the plastic container body and the tubular body come into contact with each other is bonded.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in more detail with reference to the drawings. FIG. 1 is an explanatory view of the configuration of a first embodiment of the heat insulating container according to the present invention. As shown in FIG. 1, an insulated container 30 according to the first embodiment of the present invention has an inverted truncated cone-shaped plastic container body having a large opening at the top, which comprises a body side wall 1 having a flange 3 at an upper opening edge and a bottom plate 2. A cylindrical body 20 made of paper is fitted around the side wall 1 of the body 10 to form a space A between them. The plastic container body 10 is a plastic wide-mouthed container formed by sheet molding (vacuum / pressure molding) from a polyolefin-based resin sheet or molded by thin-walled injection molding. A lid member (not shown) made of a laminated sheet having a sealant layer in the innermost layer is heat-sealed in a peelable manner. At a predetermined level of the trunk side wall 1, a projecting portion formed by two horizontal ribs 4 projecting outward is formed so as to go around the trunk side wall 1. These horizontal ribs 4 provide rigidity to the plastic container main body, at least one of which abuts on the cylindrical body 20 to form a heat insulating space A between the cylindrical body 20 and the body side wall 1 of the plastic container main body. Functioning. The number and level of the horizontal ribs 4 can be appropriately determined at the container designing stage. In addition, one of them may also serve as an instruction line for an appropriate level of hot water supply when pouring hot water into the cup body, that is, an eye for filling hot water. One cylindrical body 20 is formed into an inverted frustoconical body by sticking a blank obtained by punching out a paperboard into a fan shape in the same manner as in forming the body of a paper cup to form an inverted truncated cone.
Is formed. The inner curl portion 6 comes into contact with the lower portion of the body side wall 1 of the plastic container body 10 and functions to form the heat insulating space A similarly to the horizontal rib 4 described above. And, as shown in the side view of FIG. 1, by forming a radius at the bottom corner, it functions to enhance the design. The plastic container main body 10 and the cylindrical body 20 fitted so as to cover the plastic container main body 10 are adhered so as not to come off during transportation or use, but the adhesion is made at any one of the contact portions. It is enough if it is performed in.

FIG. 2 is an explanatory view of the configuration of a second embodiment of the heat insulating container according to the present invention. In the case of the heat insulating container 30 according to the second embodiment of the present invention, as shown in FIG. 2, the outwardly protruding portion formed on the body side wall 1 of the plastic container main body 10 is a step 5, and Step 5 is formed at a predetermined level,
The number is appropriately determined at the stage of designing the heat insulating container 30 according to the present invention. The step 5 provides rigidity to the plastic container main body, and functions so as to form a heat insulating space A between the body side wall 1 and the cylindrical body 20 by contacting the cylindrical body 20 fitted around the plastic container main body. are doing. The cylindrical body 20 having the inner curl portion 6 is fitted so as to cover the body side wall 1 of the plastic container main body 10, and abuts on the tip of at least one step 5. It functions so as to form a heat insulating space A by abutting on the lower part of the trunk side wall 1 of FIG. And the plastic container body 10
And at least one of the contact points so as not to come off from the cylindrical body 20 fitted so as to cover the body side wall 1.

FIG. 3 is an explanatory view of the configuration of a third embodiment of the heat insulating container according to the present invention. In the case of the heat insulating container 30 according to the third embodiment of the present invention, as shown in FIG. 3, the body side wall 1 of the plastic container main body 10 is composed of a combination of a step 5 immediately below the flange 3 and a middle horizontal rib 4. Has protrusions. The cylindrical body 20 having the inner curl portion 6 is fitted so as to cover the body side wall 1 of the plastic container body 10,
The side surface of the step 5 immediately below the flange 3 and the tip of the middle horizontal rib 4 are in contact with each other, and the inner curl portion 6 is in contact with the lower part of the body side wall 1 of the plastic container body 10 to form the heat insulating space A. I have. The steps 5 and the horizontal ribs 4 function to give rigidity to the plastic container body 10.

As described above, the heat-insulating space A of the heat-insulating container 30 according to the present invention includes the outwardly projecting portion of the body side wall 1 of the plastic container main body 10 and the inner curl portion 6 of the cylindrical body 20.
The spacing can be freely set by controlling the degree of their protrusion, and the heat insulation properties that tend to be uneven at the top and bottom in conventional paper-based heat insulation containers are uniform. Can be stabilized. Therefore, according to the present invention, it is a matter of course to supply a heat-insulating container that can withstand use sufficiently even when hot water is supplied to the upper part of the heat-insulating container, such as a cup ramen, when the amount of hot water such as soup and miso soup is relatively small. Can be.

FIG. 4 is a bottom view of the plastic container body 10 of the first embodiment. As shown in FIG. 1, the plastic container body 10 of the first embodiment is provided with a horizontal rib 4 at a predetermined level of the body side wall 1, and this horizontal rib 4 is shown in FIG. As shown in the figure, the body part side wall 1 may be made to go around continuously, or as shown in FIG. When the number of the horizontal ribs 5 is the same, the intermittent rotation makes the rigidity of the plastic container body 10 lower, but expands the heat insulating space A, and the heat insulating space A communicates up and down to heat the entire heat insulating space A. Since the air is easily moved, the temperature rise is homogenized, and as a result, the effect of lowering the surface temperature is obtained. When the notch 7 is provided by intermittently connecting the horizontal ribs 4 as described above, the number of divisions is 4 to 8 for the entire circumference.
Is preferably 30% or less of the entire circumference.

The cross-sectional shape of the horizontal rib 4 provided on the plastic container body 10 is shown in FIGS. 1 and 3, but it is preferable that the horizontal rib 4 is sharp and protrudes high in order to widen the heat insulating space. However, when the plastic container body 10 is molded by the vacuum / pressure molding method, it is necessary to set the degree of protrusion so as to be small enough to be caught from the mold and to be able to be pulled out. There is. This limit also depends on the plastic sheet material used. In order to reduce the catch at the time of pulling out, the upper slope of the horizontal rib 4 in FIGS. The deformation of the horizontal ribs 4 is the same as the step 5 shown in the second embodiment of FIG.
It is a projecting part consisting of. In this case, there is no problem at the time of pulling out from the mold. However, the heat insulation space A is slightly smaller than the horizontal rib 4.

Further, in the case of the first and third embodiments in which a plurality of horizontal ribs 4 are provided on the cylindrical body 20, it is not necessary that all the horizontal ribs 4 abut on the plastic container body 10, and rather, the horizontal ribs 4 do not abut. However, if the body is held by hand after the hot-water supply cooking, the cylindrical body 20 is slightly bent, but the surface temperature of the cylindrical body 20 is low and the cylindrical body 20 is easy to hold. This is because the heat insulation space A becomes larger due to the horizontal ribs 4 that do not abut, and convection of air occurs in the heat insulation space A up and down, so that heat is easily dispersed.

The practical inner volume of the heat insulating container 30 according to the present invention covers a wide range of 200 to 1500 cc when fully filled. The plastic container main body 10 having an inner volume in this range and having a wide mouth shape shown in the above embodiment can be easily formed by a normal vacuum / pressure forming method using a polypropylene resin sheet. This molding method has a lower mold cost and can be mass-produced than the injection molding method, but tends to cause uneven thickness during deep drawing. For example, a plastic container body 10 having an internal volume of 1000 cc.
Is molded using a 0.8 mm thick polypropylene resin sheet, the thickness of each part of the plastic container body 10 is 0.8 mm at the flange 3 and 0.2 to
0.3 mm and 0.5 mm at the bottom 2. in this way,
In particular, since the trunk side wall 1 is stretched and thinned at the time of molding, the protrusions provided on the trunk side wall 1 function effectively in order to complement the rigidity of the trunk side wall 1.

In addition, it is necessary to give due consideration to the case where hot water comes into contact with the plastic surface on the inner surface of the heat-insulating container. Elution of monomers, heavy metals, and other additives remaining in the plastic tends to occur. There is a problem of food contamination due to them. In this case, it is natural that the amount of these eluted does not exceed the standard value defined by the Food Sanitation Law.
For example, it has been pointed out that there is a risk of disturbing the endocrine secretion of organisms, such as bisphenol A eluted from polycarbonate resins often used in baby bottles and tableware for school meals, and styrene oligomers eluted from expanded polystyrene containers. The use of resins that elute hormones (endogenous endocrine disrupters) should be avoided from a precautionary principle. In the heat insulating container 30 according to the present invention, since a non-added resin is further selected and used from the polypropylene resin having a small amount of uneasy material, it can be used on the innermost surface of the heat insulating container with a sense of security.

The paperboard used for the tubular body 20 has good printability and
At the same time, curl moldability is required and the basis weight is 230 g / m^Two
~ 350g / m^TwoCoated cardboard or 160g
/ M ^Two~ 250g / m^TwoCard paper is suitable for use
You. When the grammage is less than this limit, the rigidity of the tubular body 20 is reduced.
Too low, especially at high temperatures
If you lose sufficient insulation and exceed this limit, the stiffness
However, the processing accuracy of the inward curl part 6 deteriorates,
It is not preferable because the charge cost increases. Element of cylindrical body 20
The material may be further subjected to resin coating or resin impregnation.
By this, the rigidity and the resistance of the whole heat insulating container 30 according to the present invention are improved.
External force applied during logistics, enhancing compressibility, crush resistance, etc.
To protect the contents. Ma
In this way, only the stable insulation properties
If you have rigidity and make it difficult to deform,
Pouring as tableware when pouring and holding in hand
Enhance integrity and reliability, especially for the elderly and
It is an important factor for disabled people and children and it is a barrier
This is an indispensable element for free products. According to the invention
The heat insulating container 30 is a composite container made of paper and plastic.
Container that can be easily separated and discarded after use.
Good rejection and good stiffness
If crushed, it will be easily crushed.
Volume reduction is easy. Therefore, foaming
Compared to other insulated containers that use plastic,
Insulated container with low environmental load.

FIG. 1 shows the appearance of the heat insulating container 30 according to the present invention.
As shown in the side view on the right side of FIG. 3 to FIG. 3, many vertical irregularities seen in a conventional paper-based heat insulating container are eliminated, and a high-quality design can be provided. The inward curl portion 4 fills the gap between the both side walls of the plastic container main body 10 and the cylindrical body 20 around the bottom portion 2, so that dirt and foreign matter enter the space gap A of the body portion, or the liquid from the end face of the paperboard. Prevents absorption. It also functions to enhance the design of the bottom corner. In addition, this cylindrical body 20
High degree of freedom of printing, not only known printing such as offset, gravure, flexo, etc., but also various overcoating, foil stamping, post-printing processing such as embossing can be performed freely, so it is excellent in combination with the above-mentioned design properties A cosmetic effect can be exhibited. Furthermore, the side wall surface of the cylindrical body 20 and the surface of the inward curl portion 4 are hardly wetted by an overcoating layer such as an OP varnish, and can be hardly stained.

Next, a method for manufacturing the heat insulating container 30 according to the present invention will be described. First, the plastic container body 10
Can be easily formed by a usual vacuum / pressure forming method or a thin-walled injection forming method. In the case of vacuum / pressure molding, the use of polypropylene resins is particularly preferred. This is because the plastic sheet has elasticity, and even if the above-mentioned horizontal ribs 4 protrude, the plastic sheet can be easily pulled out from the mold. The cylindrical body 20 is formed by printing a pattern, a logo, characters, etc. on a sheet or rolled paper of a card type, a coat ball type, etc., punching it out, forming a fan-shaped blank, sticking the body with a paper cup forming machine or the like, and sticking the body to an inverted cone. A trapezoid is formed and then the bottom is curled inward. Finally, the tubular body 20 is fitted and inserted into the plastic container body 10 and adhered to at least one of the contact points, for example, the inner curl portion 4, whereby the heat insulating container 30 according to the present invention is completed. In this case, the adhesive may be of any type, or a heat sealant layer may be provided at the contact portion to perform thermal bonding. The completed insulated container 30 according to the present invention is supplied to the user in a state of being stacked at a constant pitch.

[0017]

According to the present invention, the inner curl portion 6 provided at least at the lowermost portion of the cylindrical body 20 and the protrusion provided at a predetermined level on the body side wall 1 of the plastic container body 10 are formed. The heat insulating space A can provide stable heat insulating properties over the entire body side wall, and by using the plastic container body 10 inside, liquid leakage is guaranteed for a long time, and the outer paper cylinder is used. By the body 20, the heat insulating property of the paper can be effectively used, and a heat insulating container having a high degree of freedom in printing and a luxurious design can be provided at economic cost. In addition, since the entire container is rigid, has little deformation and is easy to hold, it provides a container having high physical safety as an instant food container to be cooked by injecting hot water and having high hygiene safety. be able to. Furthermore, after use, it can be easily separated into paper and plastic, and the volume can be easily reduced, so that the disposal property is good and it is possible to contribute to the reduction of environmental load.

[Brief description of the drawings]

FIG. 1 is a configuration explanatory view of a first embodiment of a heat insulating container according to the present invention.

FIG. 2 is a configuration explanatory view of a second embodiment of the heat insulating container according to the present invention.

FIG. 3 is a structural explanatory view of a third embodiment of the heat insulating container according to the present invention.

FIG. 4 is a bottom view of the plastic container body 10 of the first embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Body side wall 2 Bottom plate 3 Flange 4 Horizontal rib 5 steps 6 Inward curl part 7 Notch part 10 Plastic container main body 20 Tubular body 30 Insulated container by this invention

 ────────────────────────────────────────────────── ─── Continuing from the front page (72) Inventor Kazuki Yamada 1-1-1 Ichigaya-Kaga-cho, Shinjuku-ku, Tokyo F-term within Dai Nippon Printing Co., Ltd. 3E067 AB01 BA02B BA02C BA07B BB01C BB14B BC07A CA18 CA24 EA06 EB27 ED03 EE02 GA11 GD05

Claims (7)

[Claims] 1. An inverted truncated cone-shaped plastic container body having a flange at an upper opening edge, a body side wall having an outwardly projecting portion, and a bottom plate, and an inward curl portion at a lower end. An inverted truncated cone-shaped paper tubular body, the tubular body is fitted so as to cover the body side wall of the plastic container body, and the protruding portion contacts the tubular body,
An insulated container, wherein an insulated space is formed by contacting the inward curl portion with the body side wall. 2. The heat insulating container according to claim 1, wherein said projecting portion comprises a horizontal rib. 3. The heat insulating container according to claim 1, wherein the horizontal rib is provided so as to continuously circumnavigate a body side wall of the plastic container main body. 4. The heat insulating container according to claim 1, wherein the horizontal rib is provided so as to intermittently circumvent the body side wall of the plastic container main body. 5. The heat-insulating container according to claim 1, wherein the projecting portion comprises a step. 6. The heat insulating container according to claim 1, wherein the projecting portion is formed by a combination of a horizontal rib and a step. 7. The heat insulating container according to claim 1, wherein at least one of the places where the plastic container body and the cylindrical body come into contact with each other is bonded.