JP2000007057A - 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 and excellent in safety, design and economy. SOLUTION: The heat-insulating container 30 having a heat insulating space A comprises a plastic container body 10 of an inverted truncated cone shape comprising a body side wall 1 having a flange 3 on an upper opening rim and a bottom plate 2 and a paper cylinder 20 of an inverted truncated cone shape formed with an inward curl 4 at a lower end and with a horizontal rim 5 inwardly protruding on a body side wall, wherein the cylinder 20 is fitted into the plastic container body 10 so that the inward curl 4 and the horizontal rib 5 come into contact with the body side wall 1 of the plastic container body 20.

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. Japanese Utility Model Laid-Open No. 4-45212 discloses 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 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 environmental problems in the disposal treatment, the above-mentioned plastics have environmental hormones (exogenous endocrine disrupting chemicals) that elute from the container in the hot water injected for some plastics. Substance) has been raised. Furthermore, for direct printing on the surface, it is necessary to rely on curved surface printing after molding, and the printing effect is far inferior in terms of sharpness, resolution, productivity, etc. as compared to paper containers with no irregularities on the surface. is there. 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, regarding the above-mentioned paper heat-insulating container having an uneven cross-sectional shape on the surface, the degree of freedom of printing is most restricted, and fine characters are difficult to see, only monotonous and rough printing can be performed, and the design There is a problem above. 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]

SUMMARY OF THE INVENTION In order to achieve the above object, the heat insulating container of the present invention comprises an inverted truncated cone-shaped plastic container main body comprising a body side wall having a flange at an upper opening edge and a bottom plate, An inward curl portion is formed at a lower end portion, and an inverted truncated cone-shaped paper tubular body in which a horizontal rib protruding inward is formed on the body side wall, the tubular body being The heat insulation space is formed by being inserted so as to cover the body side wall of the plastic container body, and the inward curl portion and the horizontal rib abutting on the body side wall of the plastic container body. Features. Further, the heat insulating container may be configured such that at least one of the abutting portions of the plastic container body and the cylindrical body is bonded. The horizontal rib may be provided so as to be continuous or to go around the body side wall of the tubular body.

[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 one embodiment of the heat insulating container according to the present invention. The insulated container 30 according to the present invention includes:
As shown in FIG. 1, a paper cylinder is formed around the body side wall 1 of an inverted truncated cone-shaped plastic container body 10 having a large opening at the top, comprising a body side wall 1 having a flange 3 at an upper opening edge and a bottom plate 2. The body 20 is inserted and a space A
Are formed. Plastic container body 1
Numeral 0 is a plastic wide-mouthed container formed by sheet molding (vacuum / pressure molding) from a polyolefin-based resin sheet or by thin-walled injection molding. A lid (not shown) made of a laminated sheet having a sealant layer is heat-sealed so as to be peelable. On the other hand, the cylindrical body 20 is formed into an inverted frustoconical body by sticking a blank formed by punching out a paperboard into a fan shape in the same manner as in the shaping of the body of the paper cup to form an inverted truncated conical body. Further, at least one horizontal rib 5 protruding from the outside to the inside is provided at a predetermined level of the side wall. The horizontal rib 5 has a distal end abutting on the side wall 1 of the plastic container main body 10 together with the inner curl portion 4 and functions to form a space A for heat insulation between the plastic container main body 10 and the cylindrical body 20. . When there are a plurality of horizontal ribs 5, it is not necessary that all of them contact the side wall 1 of the plastic container body 10, and it is sufficient that any one of them is in contact. The horizontal ribs 5 are also provided by the heat insulating container 3 according to the invention.
It functions to reinforce the strength of the torso 0. The position of the horizontal rib 5 may be appropriately determined in consideration of the strength balance of the cup body 10, and one of them is an instruction line for an appropriate level of hot water supply when pouring hot water into the cup body, that is, hot water. You may make it also serve as a line of sight. Then, the cylindrical body 20 fitted into the plastic container main body 10 is bonded at the abutting portion so as not to be displaced and dropped. However, it is sufficient if the cylindrical body 20 is bonded at any one of the abutting portions. is there.

FIG. 2 is a structural explanatory view of another embodiment of the heat insulating container according to the present invention. As shown in FIG. 2, the plastic container body 10 includes a body side wall 1 and a bottom plate 2. The flange 3 on the body side wall 1 is further extended at its tip, bent downward, and externally fitted. It is designed so that the lid of the system is fitted and sealed.
The cylindrical body 20 has an upper curl portion 4 'formed by curling the upper portion as well as the lower portion of the side wall of the inverted frustoconical body, and also has a horizontal rib 5 protruding inward. This is inserted into the plastic container main body 10 so that the upper and lower inner curls 4 and 4 ′ and the horizontal rib 5 abut on the body side wall 1 of the plastic container main body 10, and at least one of the contact positions It is what was made to adhere.
In this embodiment, by providing the inner curl portion 4 'at the top, the space gap A is firmly held even at the upper part of the body of the heat insulating container 30 according to the present invention, and stable heat insulation can be provided to the whole body. it can.

The distance between the heat insulating spaces A of the heat insulating container 30 according to the present invention can be freely set by controlling the degree of protrusion of the horizontal ribs 5 and the inward curling portions 4, 4 'in the cylindrical body 20. In the conventional paper-based heat insulating container, the heat insulating property, which tends to be non-uniform at the upper part and the lower part, can be homogenized and stabilized. Therefore, according to the present invention, it is needless to say that when the hot water supply level of soup, miso soup and the like is relatively low, an insulated container that can sufficiently withstand use even when hot water is supplied to the upper part of the insulated container such as a cup ramen. Can be.

FIG. 3 shows a tubular body 2 of a heat insulating container according to the present invention.
0 is a bottom view. As shown in FIGS. 1 and 2, the cylindrical body 20 of the heat insulating container 30 according to the present invention is provided with the horizontal ribs 5 at a predetermined level on the side wall.
The side wall of the tubular body 20 may be continuously circulated as shown in FIG. 3A, or may be intermittently circulated as shown in FIG. 3B. In the case where the number of the horizontal ribs 5 is the same, the intermittent rotation is slightly inferior in preventing the side wall of the tubular body 20 from bending, but the heat insulating space A expands and the heat insulating space A communicates vertically. Since the movement of the heated air in the entire heat insulating space A is easily performed, the temperature rise is homogenized, and as a result, the effect of lowering the surface temperature is obtained. When the notch 6 is provided by intermittently connecting the horizontal ribs 5 in this manner, the number of divisions is 4 to 8 with respect to the entire circumference, and the ratio of the notch 6 to the entire circumference is 30%. The following is preferred.

The cross-sectional shape of the horizontal rib 5 of the heat-insulating container according to the present invention is shown in FIGS. 1 and 2. However, in order to widen the heat-insulating space, a sharp protrusion is preferable. However, processing into such a shape is based on the premise that the paperboard used for the tubular body 20 is excellent in processing suitability. On the other hand, the horizontal ribs 5 having a gentle inclination are easy to mold regardless of the quality of the paperboard. However, since the heat insulating space is reduced, the heat insulating property is lost, which is not preferable. Therefore,
As for the cross-sectional shape of the horizontal rib 4, it is necessary to select an optimum shape excellent in processing suitability to be described later, in addition to heat insulating properties based on the size of the heat insulating space.

In the case where a plurality of horizontal ribs 5 are provided on the cylindrical body 20, it is preferable that all the horizontal ribs 5 do not come into contact with the plastic container body 10, although there is some bending after hot water supply cooking, Is low and easy to hold. This is because the heat insulation space A becomes larger due to the horizontal ribs 5 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 internal 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,
Particularly, since the body side wall 1 is stretched and thinned at the time of molding, the horizontal rib 5 is used to complement the strength of the body side wall 1.
The attached cylindrical body 20 functions effectively.

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.

As shown in the side views of FIGS. 1 and 2, the external appearance of the heat insulating container 30 according to the present invention has a high-class appearance without many longitudinal unevennesses seen in a conventional paper-based heat insulating container. It can provide designability. 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. In addition, the tubular body 20 has a high degree of freedom in printing, and can perform not only known printing such as offset, gravure, and flexo, but also post-printing processing such as various overcoating, foil pressing, and embossing. In addition, an excellent cosmetic effect can be exhibited in combination with the above-described design. 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 of 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 an ordinary vacuum / pressure molding method or an injection molding method, and thus description thereof is omitted. 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, and sticking the body with a paper cup molding machine or the like to paste the body into an inverted cone. It is trapezoidal and then curls inward at least at its bottom.
If the inverted truncated cone obtained in this way is extrapolated to a mandrel in which the horizontal rib equivalent portion has been cut in a groove shape in advance, and while rotating, the rotating roller is strongly pressed inward from the outside in the groove portion, Horizontal ribs protruding inward can be formed. In this case, if the rotating roller is pressed over the entire circumference, a continuous horizontal rib 5 shown in FIG. 3A is obtained. ) Can form intermittent horizontal ribs 5. Finally, it is necessary to pull out the cylindrical body 20 processed from the mandrel,
The horizontal rib 5 having a gentle lower slope is easier to pull out and is superior in workability. The horizontal ribs 4 can also be formed by drawing using male and female molds. Finally, the tubular body 20 is inserted into the plastic container main body 10 and adhered to at least one of the contact points, for example, the lower inner curl portion 4, whereby the heat insulating container 30 according to the present invention is completed. . The adhesive may be of any type, or may be provided with a heat sealant layer at the contact portion to perform thermal bonding. Completed insulated container 3 according to the invention
0 is supplied to the user while being stacked at a constant pitch.

[0016]

According to the present invention, the inner side curl portion 4 provided at least at the lowermost portion of the cylindrical body 20 and the horizontal rib 5 provided at a predetermined level on the side wall of the cylindrical body 20 make the body side wall. Provide stable thermal insulation over the entire surface, use the plastic container body 10 inside, ensure liquid leakage for a long time, and provide an insulated container with a high degree of freedom of printing and a luxurious design at economical cost. it can. 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 structural explanatory view of one embodiment of a heat insulating container according to the present invention.

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

FIG. 3 is a bottom view of the tubular body 20 of the heat insulating container according to the present invention.

[Explanation of symbols]

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

Continued on the front page (72) Inventor Kazuki Yamada 1-1-1 Ichigaya-Kaga-cho, Shinjuku-ku, Tokyo F-term in Dai Nippon Printing Co., Ltd. (reference) 3E067 AB01 BA02B BA02C BA07B BB01C BB14B BC07B CA18 EA06 EB27 GA11

Claims (4)

[Claims] 1. An inverted truncated cone-shaped plastic container body comprising a body side wall having a flange at an upper opening edge and a bottom plate, an inward curl portion formed at least at a lower end portion, and an inward direction formed on the body side wall. An inverted truncated cone-shaped paper tubular body formed with a protruding horizontal rib, the tubular body being fitted so as to cover the body side wall of the plastic container body, A heat insulating container, wherein a heat insulating space is formed by the direction curl portion and the horizontal rib contacting the body side wall of the plastic container body. 2. The heat insulating container according to claim 1, wherein at least one of abutting portions of the plastic container main body and the cylindrical body is bonded. 3. The heat insulating container according to claim 1, wherein the horizontal rib is provided so as to continuously circumnavigate the body side wall of the tubular 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 cylindrical body.