JP2005082165A - Heat insulating paper-made container - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a paper-made container of excellent heat insulation without any problem associated with the use of adhesive. <P>SOLUTION: In the heat insulating paper-made container comprising a bottomed paper-made container body having an outwardly-curled mouth edge portion on an upper opening end and a cylindrical barrel band mounted on an outer wall surface side of a barrel of the container body, a plurality of curled portions which are curled inward of the barrel band are provided on a lower end of the cylindrical barrel band at a predetermined interval along an inner circumference of the lower end. An upper end inner surface of the cylindrical barrel band is brought into contact with an outer wall surface immediately below the mouth edge portion of the container body, and the curled portions at the lower end of the cylindrical barrel band has a size so as to be brought into contact with the outer wall surface at a lower portion of the container body. When the cylindrical barrel band is mounted on the outer wall surface side of the container body, the upper end inner surface of the cylindrical barrel band is brought into contact with the outer wall surface immediately below the mouth edge portion of the container body, and the curled portions at the lower end of the cylindrical barrel band are integrally adhered to the outer wall surface at the lower portion of the container body. A vent hole to be communicated with a space formed between the container body and the cylindrical barrel band is formed in the lower end of the cylindrical barrel band. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a heat insulating container. More specifically, in the present invention, a cylindrical shell is joined on the outer wall surface of the container body trunk so as to form a heat insulating gap between the outer wall surface of the container trunk and the inner wall surface of the cylindrical trunk, The present invention relates to a paper container having an excellent heat insulating property configured to be able to exchange hot air in a heat insulating space with cold outside air.

  Conventionally, several types of heat-insulating containers for filling high-temperature liquids have been put to practical use. For example, insulative containers made of foamed polystyrene have been used for such purposes. This is manufactured by pouring a foamed polystyrene raw material into a mold, then applying heat and pressure to foam the raw material, and taking out the molded container from the mold. The heat insulating container thus obtained is very excellent in terms of heat insulating properties. However, it cannot be said that it is economical in terms of manufacturing cost. In addition, it has been reported that when hot water is poured into a foamed polystyrene container, a small amount of environmental hormones are eluted from the container body, which adversely affects the human body. Moreover, it is a container that needs to be reconsidered from the viewpoint of saving oil resources or incineration of waste. Furthermore, since the outer surface of the heat insulating container made of styrene foam is not smooth, there is a disadvantage that it is inferior in printability.

  In order to satisfy printing suitability and heat insulation properties at the same time, a paper container having a double structure has been proposed (for example, see Patent Document 1). This container includes a paper cup main body 200 as a container main body and a paper cylindrical trunk 300 bonded to the outer periphery of the paper cup main body, and a space is provided between the outer surface of the paper cup main body and the inner surface of the cylindrical trunk. This gives the container heat insulation.

Japanese Utility Model Publication No. 4-45212

  As shown in FIG. 7, this container rolls the blank 290 so that both side edges 290-1 and 290-2 slightly overlap, and bonds the overlap to form a cylindrical paper cylinder 300, Then, after curling the lower end of the cylindrical body winding 300 inward to form a curled portion, an adhesive 204 is applied to the outer wall surface near the lip portion 202 of the bottomed paper cup body 200 formed in advance by a conventional method, The cylindrical body roll 300 is manufactured by covering and integrating the paper cup body 200. In this container, a closed space 400 is formed between the paper cup main body 200 and the cylindrical body roll 300, and this space 400 provides heat insulation.

  However, according to this method, as shown in FIG. 8, the adhesive 204 on the outer wall surface of the bottomed paper cup body 200 is pushed upward by the inner wall surface of the paper cylindrical body roll 300, In some cases, the paper cup body 200 protrudes from the lower outer side of the lip portion 202 and comes into contact with the user's lips, resulting in discomfort or discomfort.

  Accordingly, an object of the present invention is to provide a double-structure heat-insulating paper container that does not have the problems associated with the use of an adhesive as described above.

  As a means for solving the above-mentioned problems, a feature of the invention according to claim 1 is that a bottomed paper container main body having a mouth edge curled outward at an upper opening end, and an outer side of the container main body In a heat-insulating paper container comprising a cylindrical shell wound mounted on the wall surface side, a plurality of curled portions curled inwardly of the cylindrical winding are provided on the inner periphery of the lower end portion. Are provided at predetermined intervals along the cylindrical body winding, and the upper end inner surface of the cylindrical body winding is in contact with the outer wall surface immediately below the container body rim, and the curled portion of the lower end of the cylindrical body winding is below the container body. When the cylindrical torso is attached to the outer wall surface of the container body, the inner surface of the cylindrical torso contacts the outer wall surface directly below the mouth edge of the container body. At the same time, the curled portion at the lower end of the cylindrical body winding is bonded to the outer wall surface below the container body. Which are integrated by, thereby the bottom end of the tubular wrapping, it is to form a vent for the air gap and communicating formed between the container body and the cylindrical wrapping.

  According to the invention according to claim 1 configured as described above, the problem that the adhesive is exposed in the vicinity of the container mouth portion does not occur at all, and the container is formed by the vent hole formed in the curled portion of the cylindrical body winding. The hot air in the gap between the main body and the cylindrical body winding can be exchanged or ventilated with the cold atmosphere outside the container, and since the hot air does not accumulate in the gap, a very excellent heat insulating property can be obtained.

  As a means for solving the above-mentioned problems, the invention according to claim 2 is characterized in that, in the invention according to claim 1, the inner diameter of the container body linearly decreases from the upper end to the lower end. It is.

  According to the invention according to claim 2 configured as described above, the width of the heat insulating gap formed between the cylindrical body winding and the container main body is maximized in the vicinity of the curled portion of the cylindrical body winding.

  As a means for solving the above-mentioned problems, the invention according to claim 3 is characterized in that, in the invention according to claim 1, the inner diameter of the container body is enlarged radially outward near the upper end. It has a stepped portion.

  According to the invention according to claim 3 configured as described above, since the width of the heat insulating gap formed between the cylindrical body winding and the container main body is expanded from directly below the stepped portion, the heat insulating property can be improved.

  As a means for solving the above-mentioned problem, the invention according to claim 4 is characterized in that, in the inventions according to claims 1 to 3, the lower end portion of the cylindrical body winding is higher than the lower end portion of the container body body portion. It exists in the position of.

  According to the invention according to claim 4 configured as described above, since the vent hole at the lower end of the cylindrical body winding is always kept open, even when the container is placed on the upper surface of a table or the like, Hot air in the heat insulating gap is released to the outside through the pores, and a further excellent heat insulating property is obtained.

  According to the present invention, compared with the conventional double-structured paper container as described in Patent Document 1, there is no risk of exposure of the adhesive at the mouth edge, and much better heat insulation. A paper container having properties is obtained.

Hereinafter, preferred embodiments of the heat insulating paper container of the present invention will be specifically described with reference to the drawings.
FIG. 1 is a partially enlarged sectional view of an example of a heat insulating paper container of the present invention. As shown in FIG. 1, the heat-insulating paper container 1 of the present invention consists essentially of a container main body 10 and a cylindrical body roll 30. The container body 10 includes a body portion 12 and a bottom plate portion 14. Both the body portion 12 and the bottom plate portion 14 are formed from paper 16, but the inside of the container body 10 is filled with liquid, so that the penetration of the liquid into the body portion 12 and the bottom plate portion 14 is prevented. In addition, a thermoplastic synthetic resin film 18 (for example, polyethylene, polystyrene, nylon, polypropylene, polyethylene terephthalate, or the like) is laminated on the inner wall surface side of both the body portion 12 and the bottom plate portion 14. Instead of the thermoplastic synthetic resin film, an aluminum foil can be laminated. Such liquid-permeable paper cups themselves are well known to those skilled in the art. At the upper end of the body part 12 of the container main body 10, there is a lip part 3 formed by curling the upper part of the body member toward the outside of the container. A plurality of curled portions 36 that are curled inward are provided at predetermined intervals along the inner periphery of the lower end portion of the cylindrical body winding 30. That is, the curled portion 36 does not exist continuously throughout the entire week inside the lower end portion of the cylindrical body winding 30, but exists partially or intermittently. The cylindrical body winding 30 has a size or an inner diameter in which the inner surface of the upper end of the cylindrical body winding 30 is in contact with the outer wall surface just below the lip portion 3 of the container body 10 and the curled portion 36 at the lower end of the cylindrical body winding is in contact with the outer wall surface below the container body. Have Therefore, when the cylindrical body winding 30 is mounted on the outer wall surface side of the body portion 12 of the container body 10, the inner surface of the upper end 32 of the tubular body winding 30 is tightly connected to the outer wall surface of the body portion 12 immediately below the container edge 3. The curl portion 36 at the lower end of the cylindrical body winding is integrated with the outer wall surface below the body portion 12 of the container body 10 with an adhesive 38. This completely overcomes the disadvantages of the prior art that the adhesive is exposed near the lip 3. The container body 10 is inserted into the cylindrical body winding 30 in a wedge shape, the cylindrical body winding 30 abuts directly under the lip 3 of the container body, and further, the container is formed at the curl portion 36 at the lower end of the cylindrical body winding 30. If it is bonded to the main body, the cylindrical body winding 30 will not fall off from the container main body 10.

  FIG. 2 is a bottom view of the container 1 shown in FIG. Since the cylindrical body winding 30 intermittently has the curled portion 36 curled inside, when the cylindrical body winding 30 is attached to the container main body 10, the cylindrical body winding 30 and the body portion 12 of the container main body 10 are located in places where the curled portion 36 does not exist. A vent hole 54 communicating with the gap 40 formed between the cylindrical body winding 30 is formed.

  As shown in FIG. 1, the cylindrical body roll 30 is attached to the outer wall surface of the body section 12 of the container body 10, and both members are joined by the adhesive 38 applied to the curled section 36 of the tubular body winding 30. A space 40 is formed between the outer wall surface of the body 12 of the container body 10 and the inner wall surface of the cylindrical body winding 30, and the presence of the space 40 provides heat insulation to the container 1 of the present invention. When the air in the gap 40 is heated by forming a vent hole 54 communicating with the gap 40 formed between the trunk portion 12 and the cylindrical trunk roll 30 at the lower end 34 of the cylindrical trunk, Through 54, heat exchange or ventilation with the outside air is easily performed, and the heat insulating effect of the outer surface of the cylindrical body winding 30 is further improved. That is, the heated air in the gap 40 is pushed out through the vent hole 54 when the user holds the torso 30 and the torso 30 is slightly depressed with a finger, and when the finger is released. The body winding 30 is restored, and cold air outside the container is sucked into the gap 40 at that time. By repeating this, the temperature of the heated air in the gap 40 is gradually lowered, and it is effectively prevented that the user feels hot even when holding the heat insulating paper container 1 of the present invention with a finger. According to the present invention, since the curled portion 36 of the cylindrical body winding 30 is bonded to the container body, if there is no vent hole 54, the heat insulating gap is completely closed by the curled portion 36. Hot air is trapped in the gap, and as a result, it becomes difficult to grip the cylindrical waistband with fingers.

  FIG. 3 is a process diagram for manufacturing the cylindrical body winding 30. First, in (A), a blank 39 for forming the cylindrical body winding 30 is punched out from a roll base paper (not shown). At this time, the blank 39 is punched out so that the lower edge 42 of the blank 39 is notched in a comb-like shape at a predetermined interval and the comb teeth 44 are formed. The shape of the comb teeth 44 is not limited to the illustrated rectangular shape, and may be, for example, a shape as shown in FIG. 4 (A) or (B). Next, as shown in FIG. 3B, the comb tooth portion 44 is curled to form a curled portion 36. The form of the curl portion 36 is not limited to the illustrated one. For example, a form that is rounded into a substantially U shape or a substantially arc shape or curled into a spiral shape can be used. Next, as shown in FIG. 7C, the blank 39 is rounded so that the curled portion 36 is on the inside, and the both side edges 50-1 and 50-2 are overlapped and joined so as to slightly overlap, The side seam 52 is formed, and the cylindrical body winding 30 is completed. Alternatively, the blank 39 is rounded, and both side edges 50-1 and 50-2 are overlapped and joined so as to be slightly overlapped to form the side seam 52, and the cylindrical body winding 30 is formed. It is also possible to complete the body winding 30 as shown in FIG. 7C by curling the tooth portion 44 toward the upper portion of the inner wall of the body winding 30.

  The height of the trunk 30 is selected so that the lower end 34 of the trunk 30 is “plane coincident” with the lower end 20 of the trunk 12 when the trunk 30 is adhered and fixed to the trunk 12. However, the lower end portion 34 of the body winding 30 may be so-called “less than” that is above the lower end portion 20 of the body portion 12. In the case of “not so long”, when the heat-insulating paper container of the present invention is placed on the upper surface of a table or the like, the vent hole 54 is not blocked, so that the natural heat release of the hot air in the heat-insulating gap 40 is promoted and excellent heat insulation is achieved. Showing gender.

The cylindrical body winding 30 is essentially made of paper. As the base paper constituting the cylindrical drum 30, normal cardboard generated from virgin pulp can be used, but it contains 80% or more of waste paper and has a basis weight of 270 g / cm ^{2 to} 500 g / cm ^2. It is preferable to use the coated cardboard within the range. The use of recycled paper having such a high old paper content is not only preferable from the viewpoint of resource recycling, but also can significantly reduce the cost as compared with virgin pulp paper having the same basis weight. Such recycled paper is also excellent in terms of printing cosmetics. However, if the basis weight is less than 270 g / cm ² , sufficient rigidity as a body winding is not exhibited, and the body winding 30 is greatly recessed when the container 1 is gripped by hand, which is not preferable. On the other hand, if the basis weight is more than 500 g / cm ^2, it is not economical because not only the rigidity required for the body winding is exceeded, but also the workability is significantly reduced.

  The container body 10 can be easily assembled by a conventional cup manufacturing apparatus. For example, first, a container body base paper is fed out from roll paper, and a thermoplastic synthetic resin film such as polyethylene is laminated on one side of the base paper. Similarly, a thermoplastic synthetic resin film is laminated on one side of the base paper for the bottom plate. A container body blank is punched from the container body base paper, and a bottom plate blank is punched from the bottom plate base paper. In addition to the container body blank, a bottom plate blank can be simultaneously punched from the container body base paper. Using these blanks, in a conventional cup molding machine, the container body blank is placed on the container so that the film laminate surface faces the inside of the container, and the bottom plate part is placed so that the film laminate surface faces the inside of the container. assemble.

The paper material forming the container body 10 is not particularly limited. Since the container body 10 is on the inner side and not on the side directly held by a human hand, it is not necessary to use fresh and strong paper. As a general indication, the container body preferably paper having a basis weight in the range of ^{150g / m 2 ~350g / m 2} .

  Adhesives that can be used in the present invention include, for example, vinyl acetate resins, ethylene / vinyl acetate copolymer resins, vinyl acetate / acrylic copolymer resins, polyvinyl alcohol resins, acrylic resin, and other synthetic resin adhesives, Natural product adhesives such as soy sauce, corn starch, dextrin, and natural rubber can be used. Further, a hot melt adhesive or the like can be appropriately selected and used. Such hot melt adhesives are well known to those skilled in the art. The synthetic resin adhesive is preferably used in the form of an emulsion, for example. The adhesive 38 can be applied to the outer wall surface of the container body 12, or can be applied to the outer surface of the curled part 36 of the cylindrical body winding 30.

  FIG. 5 is a partially enlarged sectional view of another example of the heat insulating paper container of the present invention. As shown in FIG. 5, the container 1 </ b> A has a step portion 9 formed by expanding the upper portion of the body portion 12 of the container body 10 outward in the radial direction. A cylindrical body winding 30 is mounted so as to come into contact with the outer peripheral wall surface of the enlarged diameter side wall portion 5 up to the edge portion 3. The upper end portion 32 of the cylindrical body winding 30 is preferably brought into contact with the container mouth edge 3 directly below or fitted into the curl of the mouth edge 3. The curled portion 36 at the lower end of the cylindrical body winding 30 is bonded to the outer peripheral wall surface of the lower end of the container body portion 12 by an adhesive 38. In the container 1 of FIG. 1, the gap 40 has the maximum width near the curled portion 36 of the cylindrical body winding 30. However, unlike the container of FIG. 1, the width of the gap 40 is wider from the vicinity of the step portion 9. As a result, the volume itself of the gap 40 is also enlarged, so that further excellent heat insulation can be exhibited. A method for manufacturing a paper container having such a step 9 is known to those skilled in the art.

Example 1
A heat insulating paper container 1A of the present invention having the shape and structure as shown in FIG. 5 was produced. The container has a capacity of 250 ml, the container body 10 has a basis weight of 250 g / m ² of paper (virgin pulp 100%, density 0.84 g / cm ³ ), and the cylindrical bobbin 30 has a basis weight of 310 g. / M ² paper (waste paper content 80%, density 0.83 g / cm ³ ) was used. The container body paper was laminated with a 20 μm thick polyethylene film on one side. A curled portion 36 and a vent hole 54 were formed inside the lower end of the cylindrical body winding 30. An adhesive 38 made of vinyl acetate / acrylic copolymer resin was applied to the outer surface of the curled portion 36 of the cylindrical body winding 30, and then the cylindrical body winding 30 was attached to the container body 10.

Comparative Example 1
A control heat-insulating paper container having a structure as described in Patent Document 1 was manufactured without providing a comb-like cut at the lower end of the blank for cylindrical shell winding. Therefore, in this heat insulating paper container for comparison, the curled portion is formed over the entire inner periphery of the lower end of the cylindrical body winding, and there is no vent hole like the container of the present invention. Further, the container body is a straight type container having no stepped portion in the body. The control heat-insulating paper container was manufactured using the same material as that used in Example 1 for both the paper container body and the cylindrical shell. Also in this control container, the same adhesive as in Example 1 was applied to the outer surface of the continuous curled portion of the cylindrical body winding and adhered to the outer peripheral wall surface at the lower end of the container body.

Thermal insulation test The container of the present invention and the container of Comparative Example were filled with 95 ° C hot water up to the ninth minute of the container capacity, and the thermal insulation effect was measured. The temperature was measured in a room at 23 ° C. and 50% relative humidity in accordance with the standard defined in JIS P8111. The temperature measurement on the outer surface of the container (that is, the outer surface of the cylindrical shell) was performed by making the temperature sensor lightly contact the outer surface of the cylindrical shell at one third of the overall height of the container. . Moreover, the time-dependent change of the temperature of the hot water with which the container main body was filled was measured in the container main body inner bottom vicinity. The measurement results are shown in Table 1 below and FIG. In FIG. 6, the lower line graph is the measurement result in the container of the present invention, and the upper line graph is the measurement result in the container of the comparative example.

  As is apparent from the results shown in Table 1 and FIG. 6, the heat insulating paper container of the comparative example has a temperature of 65.5 ° C. after 30 seconds from the injection of hot water, whereas the heat insulating paper of the present invention. The container is about 59.2 ° C. and is as low as 6.3 ° C. Furthermore, at the time of 5 minutes, the heat insulating paper container of the comparative example is 59.5 ° C., whereas the heat insulating paper container of the present invention is about 55.1 ° C., which is as low as 4.4 ° C. . The temperature of the hot water filled in the container body is not much different between the container of the present invention and the container of the comparative example. Therefore, from these experimental data, it is understood that the container of the present invention that has a vent hole communicating with the heat insulating gap between the container main body and the cylindrical body winding at the lower end of the cylindrical body winding exhibits excellent heat insulating properties. it can. In particular, the container of the comparative example has an outer surface temperature of 65.5 ° C. after 30 seconds from the injection of 95 ° C. hot water, and is too hot to hold the container with fingers. On the other hand, the container of the present invention can insulate the outer surface temperature at 59.2 ° C. after 30 seconds from pouring hot water of 95 ° C., and if this temperature is reached, the container is too hot and the container is gripped with fingers There is nothing that cannot be done. That is, the container of the present invention can be grasped with a finger immediately after pouring hot water. This is presumably because the hot air in the gap 40 is exchanged with the outside air through the vent hole 54 and the heat radiation is always promoted. In contrast, in the case of the container of the comparative example, it takes 5 minutes or more to reach 60 ° C. at which the outer surface temperature of the container is felt as “not too hot”. This is presumably because hot air is trapped in the gap 40 and is not radiated. As a result, in the case of the container of the comparative example, it cannot be grasped with a finger unless it is left for a while after pouring hot water. Therefore, the container of the present invention is satisfactory in terms of usability compared to the container of the comparative example.

  The heat-insulating paper container of the present invention includes instant foods (eg, instant noodles, instant soups, instant tea pickles, instant miso soup, etc.) that are eaten by pouring hot water, as well as beverages (eg, Japanese tea, tea, coffee) , Cocoa, etc.). Not only the paper container main body but also a plastic container main body can be provided with a paper cylindrical body winding to obtain a similar heat insulating effect.

It is a partial outline sectional view of an example of the heat insulating paper container of the present invention. FIG. 2 is a bottom view of the container shown in FIG. 1. FIG. 4 is a process diagram of an example of a method for manufacturing a cylindrical body winding 30. FIG. 6 is a partial plan view showing another embodiment of a blank for a cylindrical body winding 30. It is a partial outline sectional view of another example of the heat-insulating paper container of the present invention. It is a characteristic graph figure which shows the heat insulation effect of the heat insulating paper container of the Example of this invention, and the heat insulating paper container of a comparative example. It is a schematic diagram which shows an example of the conventional manufacturing method of a double structure heat insulating paper container. It is the elements on larger scale of the vicinity of the mouth edge part of the heat insulating paper container manufactured by the method shown by FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1,1A Thermal insulation paper container of this invention 5 Expanded side wall part 9 Step part 10 Container main body 12 Trunk part 14 Bottom plate part 16 Paper 18 Polyethylene laminated film 20 Lower trunk part 30 Cylindrical trunk 32 Cylindrical upper part 34 Cylindrical lower part 38 Adhesive 40 Heat insulation gap 52 Cylindrical side seam 54 Vent

Claims (4)

In a heat-insulating paper container comprising a bottomed paper container body having an edge curled outwardly at an upper opening end, and a cylindrical shell wound mounted on the outer wall surface of the container body trunk, A plurality of curled portions that are curled inwardly of the cylindrical winding are provided at the lower end of the cylindrical winding at predetermined intervals along the inner circumference of the lower winding. Is in contact with the outer wall surface immediately below the mouth portion of the container body, and the curled portion at the lower end of the cylindrical body winding is in contact with the outer wall surface below the container body, and the cylindrical body winding is outside the container body. When mounted on the wall surface side, the upper end inner surface of the cylindrical shell is brought into contact with the outer wall just below the container body mouth edge, and the curled portion at the lower end of the cylindrical shell is placed on the outer wall below the container body. It is integrated by bonding, so that the lower end of the cylindrical body winding The container body and the cylindrical formed voids and communication with heat-insulating paper container, characterized by forming a vent hole between the wrapping. The heat insulating paper container according to claim 1, wherein the inner diameter of the body of the container body decreases linearly from the upper end toward the lower end. 2. The heat insulating paper container according to claim 1, wherein an inner diameter of the body of the container is enlarged radially outward near an upper end and has a stepped portion. The heat-insulating paper container according to claim 1, wherein a lower end portion of the cylindrical body winding is present at a position higher than a lower end portion of the container body body portion.

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