JP7134765B2 - heating container - Google Patents

Description

TECHNICAL FIELD The present invention relates to a heating container that is used for eating and drinking after being heated while the contents are contained therein, and particularly to a heating container that contains at least two kinds of food and drink in compartmental separation and heats them to separate the food and drink. The present invention relates to a heating container configured so that the food and drink can be mixed by releasing the

Examples of this type of container are described in US Pat. The container described in Patent Document 1 includes a cup-shaped container body and an inner container detachably mounted inside the container body. The inner container is formed in a cylindrical shape, and a lid is attached to the upper opening of the inner container. The lower end of the inner container is open and a flange is formed along the entire inner circumference. An edible food separation sheet that melts when heated is adhered to the upper surface of the flange to close the lower opening of the inner container. In the configuration described in Patent Document 1, the seasoning liquid is contained inside the inner container, and staple food is contained in the space defined by the inner container and the container main body (i.e., the inside of the container main body). When the liquid seasoning and the staple food are heated together with the container, the food separation sheet dissolves and the partition between the liquid seasoning and the staple food is removed, so the liquid seasoning is added to the staple food.

Patent Document 2 describes a container composed of a container body, an inner lid adhered to a flange portion of the container body, and a dome-shaped upper lid fitted to the flange portion so as to cover the upper side of the inner lid. ing. The inner lid is formed by sandwiching an aluminum foil between a heat-shrinkable thermoadhesive resin layer and a resin film layer. A circular cutout is formed in the aluminum foil. Arc-shaped cuts are formed at positions corresponding to the missing portions in the heat-adhesive resin layer and the resin film layer. When the container is heated in a microwave oven, the thermoadhesive resin layer shrinks and the tension increases, and the tension causes breakage at the above-mentioned cuts, causing the cuts to curl. Since the inner lid is opened in this way, the contents placed on the inner lid drop into the inside of the container body and are added to the other contents in the container body.

JP 2015-107832 A Japanese Patent Application Laid-Open No. 2009-12802

The containers described in Patent Documents 1 and 2 described above are containers configured so that the partition is released by heating so that two types of foodstuffs can be mixed together. The troublesome manual work of removing partitions can be eliminated. However, in the configuration described in Patent Document 1, the dissolved food separation sheet is mixed with the staple food and the seasoning liquid, so that the texture and taste are changed, the appearance is deteriorated, and furthermore, it is not suitable for consumers. There is a possibility that the marketability will be inferior, such as giving a sense of incongruity. On the other hand, in the configuration described in Patent Document 2, a break is formed in the portion where the aluminum foil is missing and the thermoadhesive resin and the resin film are directly laminated, and the break is likely to occur at the break. It's becoming Therefore, there is a possibility that, for example, during transportation, an impact force is applied to the inner lid and the inner lid is broken at the cut, and the contents are mixed together.

The present invention has been made by paying attention to the above technical problems, and is characterized by excellent airtightness of the compartments containing the respective contents, and removal of residue such as residues when the partitions of the compartments are removed. An object of the present invention is to provide a heating container that does not contaminate the contents.

In order to achieve the above object, the heating container of the present invention is a heating container that is partitioned into at least a first compartment and a second compartment by a partition, and that the partition opens when heated, a container body with an upper opening; an inner flange portion protruding toward the inner periphery of the container body at an intermediate portion in the depth direction of the container body; an opening on the inner periphery side of the inner flange portion; and a heat-shrinkable film adhered to the lower surface of the inner flange portion so as to close the inner flange portion, and the partition portion is formed by the inner flange portion and the heat-shrinkable film, and the inner flange portion and the heat-shrinkable portion are formed. The film is thermally adhered so that when the container body is heated to the heating temperature of the contents in the container body, the heat-shrinkable film is thermally shrunk and peeled off from the inner flange portion. An uneven portion in which the inner flange portion and the heat shrink film are bonded to each other by forming a concave or convex portion in the thickness direction of the inner flange portion and the heat shrink film at the adhesive portion with the heat shrink film. is provided , and the inner peripheral edge of the adhesive portion is positioned further outward in the width direction of the inner flange portion than the inner peripheral edge of the inner flange portion, and the heat-shrinkable film is positioned to prevent the contents from An unbonded portion is provided between the inner flange portion and the heat-shrinkable film by bending under weight to create a space for the content to enter .

In the present invention, the container body includes an outer container having an open top and an inner portion serving as the first compartment, and an outer container which is detachably fitted to the upper portion inside the outer container and which has the inner portion as the first compartment. An inner container serving as a second compartment may be provided, and the partition portion formed by the inner flange portion and the heat-shrinkable film may be provided at the bottom portion of the inner container.

In the heating container of the present invention, the peel strength when the heat-shrinkable film is heat-shrinked and peeled from the inner flange portion by being heated is such that the heat-shrinkable film is heat-shrinked and broken by heating. It may be smaller than the breaking strength when

In the present invention, the heat shrinkage rate of the heat shrinkable film at 100°C may be 5% or more and 50% or less.

Further, in the heating container of the present invention, the opening may be formed so as to be biased in a direction orthogonal to a vertical axis passing from the center of the container body through the center.

According to the manufacturing method of the present invention, a heat-shrinkable film is provided at the boundary between the first and second compartments to open the partition by heat-shrinking when heated with the content contained therein. It is heat-sealed to the lower surface of the inner flange portion. The thermal welding is performed by locally applying wave energy to the inner flange portion and the heat-shrinkable film which are superimposed on each other and generating heat accordingly. Moreover, the inner flange portion and the heat-shrinkable film are deformed unevenly in their thickness direction, so that the bonding area is widened, and the unevenness is oriented in the shear-peeling direction of the inner flange portion and the heat-shrinkable film. It is a so-called catch part. Therefore, since the temperature rise is localized, shrinkage or breakage of the heat-shrinkable film during the manufacturing process can be avoided or suppressed, or the bonding work can be facilitated. In addition, by providing an uneven portion to widen the bonding area, the range to which wave energy is applied or the area to generate heat can be reduced. The adhesive can be reliably adhered without causing shrinkage or breakage of the heat-shrinkable film, and can be easily adhered.

Further, in the heating container of the present invention, when the container body is heated together with the contents to the heating temperature of the contents, the heat-shrinkable film is thermally shrunk and peeled off from the inner flange portion. The contents of the first compartment and the contents of the second compartment are mixed. That is, the heat-shrinkable film forming the partitioning portion will not be mixed with the contents. The bonded portion between the inner flange portion and the heat-shrinkable film where such peeling occurs is concave or convex in the thickness direction of the inner flange portion or the heat-shrinkable film, thereby increasing the bonding area. Therefore, even if the bonding width or the width to be heated for bonding is narrow, the two can be securely bonded together so that the contents do not leak. In addition, since the width or area to be heated can be reduced, it is possible to prevent the heat-shrinkable film from being heat-shrinked during the manufacturing process and from being broken. Furthermore, by narrowing the width of the bonding portion, it is possible to narrow the width of the inner flange portion and increase the opening area of the opening on the inner peripheral side thereof.

Furthermore, in the present invention, since the inner peripheral edge of the adhesive portion is recessed from the inner peripheral edge of the inner flange portion, the content is slightly sandwiched between the inner flange portion and the heat-shrinkable film. Since the content is heated and the heat is transferred to the heat-shrinkable film, it is possible to promote heat transfer to the heat-shrinkable film, accompanying heat shrinkage, and peeling from the inner flange when the content is heated.

Further, according to the present invention, by shifting the position of the opening from the center of the container body, it is possible to produce a mixing method suitable for the ingredients.

1 is an exploded perspective view showing an example of a heating container according to the present invention; FIG. 1 is a cross-sectional view of an example of a heating container according to the present invention; FIG. It is a perspective view which shows the inside of a middle plate. It is a perspective view which shows the bottom part of an inner plate. 1 is a cross-sectional view showing part of an example of an ultrasonic welding device; FIG. FIG. 2 is a plan view showing an example of a receiving mold of an ultrasonic welding device; FIG. 4 is a cross-sectional view showing an example of the shape of the tip of the receiving mold; FIG. 4 is a diagram showing a heating process of each content by the heating container according to the present invention, (a) is a diagram showing a state in which each content is separated and accommodated, and (b) is a diagram showing a state in which the contents are heated by heating. It is a figure which shows the state which the shrink film peeled, and (c) is a figure which shows the state in which each content was mixed. It is a sectional view showing an unbonded part. 2 is a chart summarizing the results of Tests 1 and 2 for Example 1, Comparative Example 1, and Comparative Example 2. FIG. 2 is a chart summarizing the results of Tests 1 and 2 for Comparative Examples 3 to 7 and Examples 2 and 3. FIG. FIG. 4 is a cross-sectional view of another example of the heating container according to the present invention; FIG. 11 is a plan view showing another example of the bottom of the inner plate;

A heating container according to the present invention is a container that has a plurality of compartments that compartmentalize and store a plurality of contents, and that can heat each content together with the heating container. Also, the heating container is configured to open the partitions by heating to bring together the contents housed in the respective compartments. The partition part may be configured to partition the inside of the heating container in the height direction of the heating container, that is, in the upper and lower directions, or may be configured to partition the inside of the heating container in the width direction or the horizontal direction of the heating container. may be Furthermore, the heating container is made of a synthetic resin material such as polystyrene resin, polyethylene terephthalate resin, polypropylene resin, polyethylene resin, polyvinyl chloride resin, or a thin film formed of a synthetic resin material on one side or both sides. , laminated processed paper, or the like. Since the heating container according to the present invention is to be heated, it is preferably made of polyethylene terephthalate resin, polypropylene resin, or the like among the synthetic resin materials mentioned above in terms of heat resistance. Said content may be, for example, food. Therefore, the heating container according to the present invention may be a container that can store the main food and the secondary food separately before cooking, and can add the secondary food to the main food after cooking. stomach.

FIG. 1 is an exploded perspective view showing an example of a heating container 1 according to the present invention, and FIG. 2 is a sectional view of the heating container 1 according to the present invention. As shown in FIGS. 1 and 2, the container body of the heating vessel 1 corresponds to the lower plate 2 corresponding to the outer container of the present invention, and the inner container detachably attached to the inside of the lower plate 2. and a lid body 4 detachably attached to the inner plate 3. - 特許庁Since the middle plate 3 has a closed bottom portion as will be described later, the interior of the container body of the heating container 1 is vertically partitioned by the middle plate 3 . As shown in FIGS. 1 and 2, the lower tray 2 is a container whose top is open, and the middle tray 3 is fitted to the lower tray 2 so that it can be inserted into and removed from the upper side. , the space below the inner plate 3 serves as a first compartment 5. - 特許庁On the other hand, the inside of the inner plate 3, more specifically, the space defined by the inner plate 3 and the lid 4 serves as a second compartment 6. As shown in FIG. Contents different from each other can be accommodated in each of the first compartment 5 and the second compartment 6 .

The lower plate 2 is a container that is deeper or taller than the middle plate 3. The example shown here has a substantially circular bottom portion 7 and a cylindrical body portion 8 rising from the outer peripheral edge of the bottom portion 7 toward the upper opening 2a side.

The bottom 7 may be flat, but in the example shown in FIGS. 1 and 2, projections (legs) 9 functioning as a platform or legs are formed so as to protrude from the bottom surface. The lower portion of the body portion 8 is tapered upward, and the portion above it is cylindrical. The upper end of the cylindrical portion is the opening 2a. Further, of the cylindrical portion, the inner diameter is enlarged within a predetermined depth range on the side of the opening 2a, and the portion where the inner diameter is enlarged serves as the stepped portion 10. As shown in FIG. In this stepped portion 10, a portion of the peripheral wall portion forming the body portion 8 has a flange shape directed in the radial direction and has an increased section modulus, so that it functions as a rib. In addition, since the enlarged inner diameter is larger than the outer diameter of the inner plate 3, the portion with the larger inner diameter serves as a guide by reducing interference with the inner plate 3 when the inner plate 3 is fitted. It is conceivable that it works.

An outwardly extending flange portion 11 is formed at the upper end portion (opening portion 2a) of the body portion 8 . As shown in FIG. 2, the flange portion 11 has a flat upper surface and a skirt portion formed by bending the outer peripheral edge of the skirt portion downward, and has a hook-shaped cross section. This is to provide strength for maintaining the shape of the opening 2a. The flange portion 11 is adapted to catch or fit the edge portion of the inner plate 3 .

3 is a perspective view showing the inside of the middle plate 3, and FIG. 4 is a perspective view showing the bottom portion of the middle plate 3. As shown in FIG. The middle plate 3 is shallower than the lower plate 2 and has an outer diameter smaller than the upper inner diameter of the lower plate 2 so that it can be fitted inside the lower plate 2 . The inner plate 3 is a so-called temporary container even though it is a container, and has a cylindrical body 12, but the bottom of the body 12 is not closed and an opening 12a is formed. The opening 12a is closed with a heat-shrinkable film 13 in order to contain the contents inside the inner tray 3 without leaking. Specifically, an inner flange portion 14 is formed along the entire circumference of the inner surface of the lower end portion of the trunk portion 12 . Therefore, the inner flange portion 14 is an intermediate portion in the depth direction of the container body, and is provided at the boundary portion between the first compartment 5 and the second compartment 6 . A portion on the inner peripheral side of the inner flange portion 14 serves as an opening portion 12a. As shown in FIGS. 2 and 4, the heat-shrinkable film 13 is adhered to the lower surface 14b of the upper surface 14a and the lower surface 14b of the inner flange portion 14. As shown in FIG. That is, the bottom portion 15 of the inner plate 3 is formed by the inner flange portion 14 and the heat-shrinkable film 13 . In other words, the inner flange portion 14 and the heat-shrinkable film 13 partition the first compartment 5 and the second compartment 6, and constitute a partition in the present invention.

The heat-shrinkable film 13 is similar to conventional heat-shrinkable films that shrink when heated, and is made of synthetic resin such as polystyrene resin, polyethylene terephthalate resin, polypropylene resin, polyethylene resin, and polyvinyl chloride resin. made up of materials. In addition, since the heat-shrinkable film 13 shrinks by receiving heat, it is preferable that the method of bonding the heat-shrinkable film 13 to the inner plate 3 is a method that minimizes the thermal load on the heat-shrinkable film 13 as a whole. Then, even if thermal bonding (welding) is performed, a bonding method such as ultrasonic welding or laser welding, in which heat is generated locally by wave energy, is preferable. Since these welding methods do not use an adhesive, it is preferable that the inner plate 3 (inner flange portion 14) and the heat-shrinkable film 13 are made of the same material. In terms of heat resistance, when the heating container 1 is made of polyethylene terephthalate resin, polypropylene resin, or the like, the heat-shrinkable film 13 can be made of polyethylene terephthalate resin, polypropylene resin, or the like. preferable.

Furthermore, the heat shrinkage of the heat shrinkable film 13 at 100° C. is preferably 5% or more and 50% or less, and more preferably 10% or more and 30% or less. When the heat shrinkage rate at 100° C. is less than 5%, the width or length of shrinkage when heated is small. ) may not be opened. On the other hand, if the thermal shrinkage rate at 100° C. exceeds 50%, even a slight thermal load causes a large thermal shrinkage, and the bottom 15 (partition) opens to separate the first compartment 5 and the second compartment. 6 is likely to be communicated with. That is, it becomes hypersensitive to heat.

The heat-shrinkable film 13 is adhered to the lower surface 14b of the inner flange portion 14 at its periphery to seal the opening 12a. Therefore, the outer diameter of the heat-shrinkable film 13 is larger than the inner diameter (opening diameter) of the opening 12 a and smaller than the outer diameter of the bottom 15 . Then, at the contact portion where the inner flange portion 14 and the heat shrinkable film 13 overlap each other, they are pressed against each other, and in that state, wave energy such as ultrasonic waves and laser light is applied by an ultrasonic welding device, a laser welding device, or the like. is applied, heat is generated at the contact portion, and the heat causes them to adhere to each other. The inner flange portion 14 and the heat-shrinkable film 13 prevent the fluid contents from leaking into the first compartment 5, for example, when fluid contents are accommodated in the second compartment 6. In order to do so, they are glued in such a way that no radially extending gap communicating between the inside and the outside of the second compartment 6 occurs. Also, even if the width of the bonding portion is narrow, the bonding area is widened. The adhesion pattern will be described later.

On the other hand, as shown in FIG. 2, a fitting portion 16 that fits into the flange portion 11 of the lower plate 2 is formed over the entire circumference of the other end (upper end) of the body portion 12 . In other words, the lower plate 2 and the middle plate 3 are so-called spigot-fitted. A rim 17 extending in the height direction is formed over the entire circumference of the middle plate 3 on the opposite side of the fitting portion 16 in the height direction.

The outer peripheral edge of the lid 4 is fitted to the inner peripheral side of the rim 17 . A top plate portion 18 of the lid body 4 is provided with ribs 19 projecting in the height direction to the side opposite to the inner plate 3 . Therefore, when the lid body 4 is turned upside down, the ribs 19 function as legs of the heating container 1 .

Next , a method for manufacturing the heating container 1 will be described. FIG. 5 is a partial cross-sectional view showing a state in which the inner plate 3 and the heat-shrinkable film 13 are arranged in the ultrasonic welding device 20. As shown in FIG. In addition, in FIG. 5, each member is separated and described for convenience of explanation. A middle plate 3 having an opening 12a of a predetermined size is prepared. Alternatively, if the opening 12a is not formed in the middle plate 3, the opening 12a having a predetermined size is formed in the middle plate 3 by punching, for example. Separately from this, a roll-wound heat-shrinkable film 13 (not shown) is paid out by a predetermined length from the roll and placed on the receiving mold 21 of the ultrasonic welding device 20 .

Here, the configuration of the receiving mold 21 will be described. FIG. 6 is a plan view showing an example of the receiving mold 21. As shown in FIG. The receiving mold 21 sandwiches the inner flange portion 14 of the inner plate 3 and the heat-shrinkable film 13 together with the horn 22 and ultrasonically welds them. The upper surface (receiving surface) of the receiving die 21 is, as shown in FIG. The width of the tip portion of the receiving mold 21 is smaller than the width of the inner flange portion 14 (the dimension between the inner peripheral end and the outer peripheral end measured in the radial direction) of the object to be adhered. The upper surface of the receiving mold 21 is uneven in order to give unevenness in the thickness direction to the bonding portion between the inner flange portion 14 and the heat-shrinkable film 13 . For example, the upper surface of the receiving mold 21 is knurled so that the upper surface of the receiving mold 21 is uneven. This uneven portion serves as a welded portion 21a for bonding the inner flange portion 14 and the heat-shrinkable film 13 together. The uneven shape may be a shape in which a large number of dimples or projections are formed.

FIG. 7 is a cross-sectional view showing a part of the welded portion 21a of the receiving mold 21. The welded portion 21a shown in FIG. When the inner flange portion 14 and the heat-shrinkable film 13 are sandwiched between the protrusions 23 and the horn 22 with a predetermined load and welded together, the so-called surplus thickness of the inner flange portion 14 and the heat-shrinkable film 13 is formed between the protrusions 23 . It gets in between and the part becomes a recessed part or a convex part. Therefore, the inner flange portion 14 and the heat-shrinkable film 13 are locally heated by the wave energy in a state of being pressed by the flat portion at the top of the protrusion 23, and are welded to each other. Since they are welded to each other, the bonding area is wider than that of simple flat surface bonding. The recesses or protrusions generated by entering between the protrusions 23 are portions surrounded by the protrusions 23, and the recesses or protrusions are welded to each other as described above. Therefore, due to the presence of the concave portion or the convex portion, the radially communicating gap that causes leakage of the contents does not occur in the bonded portion between the inner flange portion 14 and the heat-shrinkable film 13 .

A plurality of annular ribs may be formed concentrically with the receiving mold 21 on the upper surface of the receiving mold 21 in place of the protrusions 23 described above. Even with such a configuration, it is possible to prevent the occurrence of a gap that allows communication between the inner and outer circumferences of the bonding portion. Also, the bonding area can be widened. Furthermore, when the heat-shrinkable film 13 is peeled off from the inner flange portion 14 in the shearing direction, the heat-shrinkable film 13 is caught at the portions where the ribs are formed. Therefore, since the peel strength of the heat-shrinkable film 13 is increased, the area (particularly the width) of the adhesive portion can be reduced. The peel strength of the heat-shrinkable film 13 can be controlled by changing the height of the protrusions 23 and ribs, or the number of them. In the example shown here, the peel strength of the heat shrinkable film 13 is set to be smaller than the breaking strength of the heat shrinkable film 13 when it is heated and shrunk. This can be predetermined by experiment.

Further, in the example shown here, the width of the welded portion 21a is set to be substantially the same over the entire circumference of the receiving mold 21. As shown in FIG. Therefore, the adhesive strength or peel strength is almost the same at any portion. The tip shape of the protrusion 23 described above may be circular or rectangular.

Subsequently, the middle plate 3 having the opening 12 a is placed on the heat-shrinkable film 13 . Then, the horn 22 is inserted into the inner plate 3, and the inner flange portion 14 and the heat-shrinkable film 13 are pressed against the receiving mold 21 by the horn 22 with a predetermined load. As an example, the horn 22 shown in FIG. 5 is formed in a cylindrical or conical shape and arranged on the same axis as the receiving die 21 . The width or thickness of the tip portion of the horn 22 is set substantially equal to the width of the inner flange portion 14 . Further, the tip surface of the horn 22 is formed flat so as to be in surface contact with the welded portion 21a of the receiving mold 21, and the flat portion (hereinafter referred to as flat portion) 22a is sandwiched on both sides. corners are rounded. The width of the flat portion 22a is set smaller than the width of the welding portion 21a. This is because when the inner flange portion 14 and the heat-shrinkable film 13 are ultrasonically welded to the heat-shrinkable film 13 at the corners of the receiving mold 21, the heat-shrinkable film 13 may rub against the corners and be cut off. This is to avoid this. Therefore, the inner flange portion 14 and the heat-shrinkable film 13 are ultrasonically welded within the width of the welding portion 21a.

Then, while the horn 22 is pressing the inner flange portion 14 and the heat-shrinkable film 13 against the receiving mold 21, the horn 22 is ultrasonically vibrated by an ultrasonic oscillator (not shown). As a result, frictional heat is generated between the inner flange portion 14 and the heat-shrinkable film 13, and the frictional heat melts and welds them. As a result, the width of the bonding portion 24 between the inner flange portion 14 and the heat-shrinkable film 13 becomes substantially the same as the width of the flat portion 22a, and the bonding pattern at the bonding portion 24 is similar to the shape of the welded portion 21a. It becomes unevenness|corrugation shape mentioned above. After that, the inner plate 3 is removed from the ultrasonic welding device 20, and the heat-shrinkable film 13 is cut into a predetermined size and shape. The heat-shrinkable film 13 may be cut in advance into a predetermined size and shape.

A lower plate 2 is prepared separately from the middle plate 3 configured as described above, and contents are stored in the lower plate 2. - 特許庁Then, the middle plate 3 is attached to the lower plate 2 containing the contents. Specifically, the middle plate 3 is inserted into the lower plate 2 through the opening 2a at the top thereof, and the fitting portion 16 of the middle plate 3 is fitted to the flange portion 11 of the lower plate 2 to remove the lower plate 2. Seal. Next, other contents are accommodated inside the middle plate 3, and the lid body 4 is fitted to the rim 17 of the middle plate 3 to seal the middle plate 3. Alternatively, other contents may be stored in the middle plate 3 in advance, and the middle plate 3 may be sealed with the lid 4 and fitted to the lower plate 2 .

The operation and effect of the heating container 1 having the above configuration will be described. Since the welded portion 21a of the receiving mold 21 is uneven, when the inner flange portion 14 and the heat-shrinkable film 13 are sandwiched between the receiving mold 21 and the horn 22 and are ultrasonically welded together, the bonding portion 24 will be deformed. The adhesive pattern becomes uneven. Specifically, the inner flange portion 14 and the heat-shrinkable film 13 are adhered to each other at a location corresponding to the protruding portion 23 so that there is no gap communicating in the radial direction, so-called dense adhesion. As a result, even when other fluid contents are accommodated in the middle tray 3, it is possible to prevent or suppress leakage of the other contents to the lower tray 2 side. Specifically, as shown in FIG. 8(a), each content can be stored in a separated state. In addition, although a load due to the weight of other contents acts on the heat-shrinkable film 13, since the heat-shrinkable film 13 does not have a fragile portion or an easily breakable portion, the heat-shrinkable film 13 does not need to be transported or otherwise handled. can be prevented or suppressed from breaking and opening the partition. In addition, the bonding pattern becomes uneven, so that the bonding area can be widened. As a result, the adhesive force becomes strong, and as described above, the heat shrinkable film 13 is caught by the inner flange portion 14 at the uneven portions, and the peel strength of the heat shrinkable film 13 in the shear direction increases. there is Since the peel strength can be increased in this way, the width of the adhesive part 24 can be narrowed, and the opening area of the opening 12a can be widened accordingly. can promote Furthermore, since the heat-shrinkable film 13 is ultrasonically welded to the inner flange portion 14, the heat load received by the heat-shrinkable film 13 during the bonding process can be reduced as much as possible. Deformation associated therewith can be prevented or suppressed.

Since the heating container 1 is made of a heat-resistant synthetic resin material, deformation of the heating container 1 due to heat can be suppressed during heating, and each content is heated together with the heating container 1. can. Also, the heat shrinkable film 13 is thermally shrunk by heating, and the heat shrinkable film 13 is peeled off from the inner flange portion 14 . Specifically, the adhesive portion 24 has a portion with low adhesive strength due to the thickness of the inner flange portion 14 and the heat shrinkable film 13, manufacturing variations, etc., and the heat shrinkable film is placed at such a portion with low adhesive strength. The contraction stress associated with the thermal contraction of 13 is concentrated. Moreover, the breaking strength of the heat shrink film 13 is set higher than the peel strength of the heat shrink film 13 . As a result, the heat-shrinkable film 13 is peeled off from the inner flange portion 14 before the heat-shrinkable film 13 is broken by the shrinkage stress. Then, the peeled heat shrinkable film 13 shrinks and deforms, and the inner flange portion 14 and the heat shrinkable film 13 are peeled off at the boundary portion where the peeled heat shrinkable film 13 and the inner flange portion 14 are bonded. A peeling force is generated and peeling progresses. As a result, as shown in FIG. 8(b), the bottom portion 15 of the inner plate 3 is opened, and the first partitioned chamber 5 and the second partitioned chamber 6 are communicated with each other. Then, as shown in (c) of FIG. 8, the other contents in the second compartment 6 are added to the contents in the first compartment 5 . Therefore, in the heating container 1 having the configuration described above, the user or the consumer can open the partition and mix the contents without any particular trouble.

Further, the width of the bonding portion 24 is substantially the same as the width of the flat portion 22a of the horn 22, and the inner peripheral edge of the bonding portion 24 is recessed radially outward from the inner peripheral edge of the inner flange portion 14. . Therefore, there is an unbonded portion 25 where the inner flange portion 14 and the heat-shrinkable film 13 are not bonded together inside the bonded portion 24 in the radial direction. FIG. 9 is a cross-sectional view showing the unbonded portion 25. As shown in FIG. 9, when other contents are accommodated in the second compartment 6, heat shrinks due to the load corresponding to the weight of the other contents. The film 13 bends downward in the height direction. As a result, a space is created between the inner flange portion 14 and the heat-shrinkable film 13 in the unbonded portion 25, and other contents enter this space. In this state, when the other content is warmed, the heat of the other content is transferred to the inner peripheral edge of the adhesive portion 24 . As a result, the heat-shrinkable film 13 is also shrunk at the inner periphery of the adhesive portion 24 , making it easier to separate the heat-shrinkable film 13 from the adhesive portion 24 . In addition, since the heat-shrinkable film 13 is adhered to the lower surface 14b of the inner flange portion 14, when solid matter is contained in other contents, the solid matter will not be placed on the upper surface 14a of the inner flange portion 14. There is This makes it difficult for the load due to the weight of the solid matter or the like to act directly on the heat-shrinkable film 13 . As a result, it is possible to prevent or suppress peeling of the heat-shrinkable film 13 from the adhesive portion 24 due to the load due to the weight of other contents.

Here, the action and effect of the heating container 1 according to the present invention when the adhesive strength is changed will be described by comparing Example 1 with Comparative Examples 1 and 2. FIG.

(Example 1)
A sheet made of polypropylene resin having a thickness of 0.5 mm was prepared and subjected to vacuum pressure molding to prepare a heating vessel 1 having a height of 85 mm and a diameter of 140 mm. The diameter of the opening 12a of the inner plate 3 was set to 89 mm, and the width of the inner flange portion 14 was set to 7 mm. A biaxially oriented heat-shrinkable polypropylene resin film having a thickness of 25 μm, a diameter of 105 mm, and a heat shrinkage rate of about 20% at 100° C. was adhered to the bottom portion 15 of the inner plate 3 by an ultrasonic welding device 20 . The welding part 21a of the receiving mold 21 of the ultrasonic welding device 20 is knurled to have an uneven shape, and the width of the tip of the protrusion 23 is set to 0.6 mm. The ultrasonic welding time was set at 0.15 seconds.

(Comparative example 1)
A heating container 1 was produced in the same manner as in Example 1, except that the ultrasonic welding time was set to 0.10 seconds.

(Comparative example 2)
A heating container 1 was produced in the same manner as in Example 1, except that the ultrasonic welding time was set to 0.25 seconds.

(Test 1)
After 150 g of water was placed in the middle plate 3 of the heating container 1, that is, in the second compartment 6 and allowed to stand still for 10 hours, water leakage from the second compartment 6 to the first compartment 5 was visually confirmed. did.

(Test 2)
Put 180 g of commercially available retort curry in place of water in the second compartment 6, put 220 g of cooked rice in the first compartment 5 on the lower plate 2, and put it in that state in a commercial microwave oven at 500 W for 4 minutes. The open state of the bottom portion 15 of the inner tray 3 during the cooking was visually confirmed.

(Evaluation 1)
The results of Tests 1 and 2 for Example 1 and Comparative Example 1 and Comparative Example 2 are tabulated in FIG. As shown in FIG. 10, in Example 1, no water leakage was observed even after Test 1 was conducted. Further, in Test 2, it was found that the heat-shrinkable film 13 was shrunk and the bottom 15 of the inner plate 3 was opened when retort curry was added and cooked. In Comparative Example 1, when Test 1 was conducted, water leakage was observed. When Test 2 was performed, it was found that the heat-shrinkable film 13 was shrunk and the bottom 15 of the inner plate 3 was opened. This is because, in Comparative Example 1, the ultrasonic welding time is shorter than in Example 1, so the adhesive strength of the adhesive portion 24 is low, and the heat shrinkable film 13 is peeled off from the inner flange portion 14 due to the weight of water. It seems that water leakage occurred. In Comparative Example 2, no water leakage was observed even after Test 1 was conducted. It was also confirmed that the bottom portion 15 of the inner tray 3 did not open even after Test 2 was performed. This is probably because in Comparative Example 2, the ultrasonic welding time is longer than in Example 1, so that the bonding strength at the bonding portion 24 is high. As described above, in the heating container 1 configured as described above, when the ultrasonic welding time is set to 0.15 seconds, the state in which the contents are separately accommodated can be maintained, and the middle plate can be heated by heating. It was observed that the bottom 15 of 3 could be opened.

In addition, when the heat shrinkage rate of the heat shrink film 13 is different from that in Example 1, the receiving mold 21 is not knurled, or the heat shrink film 13 is made of a material different from that of the inner plate 3, The action and effect of the heating container 1 according to the present invention will be described by comparing Examples 2 and 3 with Comparative Examples 3 to 7.

(Comparative Example 3)
A heating container 1 was produced in the same manner as in Example 1, except that the heat-shrinkable film 13 was replaced with a non-heat-shrinkable film.

(Comparative Example 4)
A heating container 1 was produced in the same manner as in Example 1, except that a film having a heat shrinkage rate of 3% at 100° C. was used as the heat shrinkable film 13 .

(Comparative Example 5)
A heating container 1 was produced in the same manner as in Example 1, except that a film having a heat shrinkage rate of 60% at 100° C. was used as the heat shrinkable film 13 .

(Comparative Example 6)
A heating container 1 was fabricated in the same manner as in Example 1, except that the welding part 21a of the receiving mold 21 was not knurled, that is, the receiving mold 21 having the flat welding part 21a was used.

(Comparative Example 7)
A heating container 1 was produced in the same manner as in Example 1, except that the inner plate 3 was made of polyethylene terephthalate resin and the heat-shrinkable film 13 was made of polypropylene resin.

(Example 2)
A heating container 1 was produced in the same manner as in Example 1, except that a film having a heat shrinkage rate of 5% at 100° C. was used as the heat shrinkable film 13 .

(Example 3)
A heating container 1 was produced in the same manner as in Example 1, except that a film having a heat shrinkage rate of 50% at 100° C. was used as the heat shrinkable film 13 .

(Evaluation 2)
The results of Tests 1 and 2 for Comparative Examples 3-7 are tabulated in FIG. As shown in FIG. 11, in Comparative Examples 3 and 4, no water leakage was observed even after Test 1 was conducted. On the other hand, in Test 2, it was found that the bottom portion 15 of the inner tray 3 did not open. It is believed that this is because the film attached to the bottom portion 15 of the inner plate 3 does not thermally shrink or has a small thermal shrinkage during heating. In Comparative Example 5, the heat shrinkable film 13 had a large heat shrinkage rate, so that the heat shrinkable film 13 could not be adhered to the bottom portion 15 of the inner plate 3 even by ultrasonic welding, and the heating container 1 was produced. could not. In Comparative Example 7, the heat-shrinkable film 13 could not be adhered to the bottom portion 15 of the middle plate 3 because the inner plate 3 and the heat-shrinkable film 13 were made of different materials, and the heating container 1 could not be produced. . In Comparative Example 6, when Test 1 was conducted, water leakage occurred in some of the heating containers 1, and when Test 2 was conducted, there were heating containers 1 in which the bottom portion 15 of the inner tray 3 did not open. This is because the welded portion 21a of the receiving mold 21 is flat and the thickness of the inner flange portion 14 and the heat-shrinkable film 13 varies. In addition, it is believed that the bonding strength was increased due to the increase in the bonding area as a whole. That is, the adhesion is not stable as a whole. In Examples 2 and 3, as in Example 1, no water leakage was observed in Test 1, and in Test 2, the heat-shrinkable film 13 was shrunk and the bottom 15 of the inner plate 3 was opened. was allowed to do so.

Therefore, in the heating container 1 having the above configuration, the inner plate 3 and the heat-shrinkable film 13 are made of the same material, and the welding part 21a of the receiving mold 21 is knurled to make the bonding part 24 uneven. Thus, the middle plate 3 and the heat-shrinkable film 13 can be stably adhered. This makes it possible to favorably maintain a state in which different contents are divided and accommodated. In addition, as described above, the ultrasonic welding time is optimized, and the heat shrinkage rate of the heat shrinkable film 13 is in the range of 5% or more and 50% or less, so that each content can be stored together with the heating container 1. When heated, the bottom part 15 of the inner tray 3 can be opened to mix the contents.

The present invention is not limited to the above-described embodiment, and the opening 12a may be formed in a part of the bottom 15 of the inner plate 3. An example is shown in FIG. In the example shown in FIG. 12, the opening 12a is formed to be biased in one side in the width direction of the heating container 1, that is, in a direction orthogonal to the vertical axis passing through the center of the container body, and the peripheral portion thereof is An inner flange portion 14 is formed to which the heat-shrinkable film 13 is adhered. The heat-shrinkable film 13 is ultrasonically welded to the lower surface 14b of the inner flange portion 14. As shown in FIG. Note that the illustration of the lid 4 is omitted in FIG. 12 for the sake of simplification of the drawing.

Therefore, in the heating container 1 configured as shown in FIG. 12, when the heat-shrinkable film 13 shrinks due to heating, the opening 12a that is biased toward one side opens. Then, on top of the contents in the first compartment 5, the other contents in the second compartment 6 are added. In this way, when configured as shown in FIG. 12, it is possible to obtain the same actions and effects as when configured as shown in FIG. You can put it on. That is, it is possible to direct the addition form or the mixing method according to the type of contents.

Further, the shape of the opening 12a and the heat-shrinkable film 13 covering the opening 12a may be triangular, star-shaped, flower-shaped, character-shaped, or the like. By doing so, the shape and range of the other content can be made the designed shape and range when the other content is placed on top of the content. In addition, it is possible to improve the appearance of the product when the contents are mixed. Furthermore, by forming the heat-shrinkable film 13 in the shape described above, the position (peeling location) where the heat-shrinkable film 13 is peeled off can be controlled. For example, among the shapes described above, when the shape of the heat shrinkable film 13 is a trapezoidal triangle or an isosceles triangle, the shrinkage width or shrinkage length of the heat shrinkable film 13 on the long side is the same as that on the short side. Greater than shrinkage width or shrinkage length. Therefore, if the heat-shrinkable film 13 is formed into a trapezoidal triangle or an isosceles triangle, the heat-shrinkable film 13 is peeled off at the long sides to form an opening. In this way, the peeled portion can be controlled.

Furthermore, a part of the adhesive part 24 may be formed with a strong seal part 26 having a higher adhesive strength than other parts. An example is shown in FIG. In the example shown in FIG. 13, a portion of the bonding portion 24 is formed wider than the other portions, and the widened portion serves as a strong seal portion 26 . The strong seal portion 26 can be formed by widening a portion of the welded portion 21a and a portion of the flat portion 22a. Therefore, in the heating container 1 configured as shown in FIG. The adhesive state between the inner flange portion 14 of the plate 3 and the heat-shrinkable film 13 can be maintained. Thereby, when the heat-shrinkable film 13 is peeled off, it is possible to prevent or suppress the mixture of the heat-shrinkable film 13 into the contents. In the present invention, instead of widening a portion of the welded portion 21a and a portion of the flat portion 22a, ultrasonic welding is performed at a predetermined location at least twice, or ultrasonic welding is performed at a predetermined location. The strong seal portion 26 may be formed at a predetermined location by, for example, lengthening the welding time. Also, a portion of the welded portion 21a or a portion of the flat portion 22a may be provided with a step to increase the sealing load at the predetermined portion, thereby forming the above-described predetermined portion as the strong seal portion 26. FIG.

When the heat-shrinkable film 13 is adhered to the inner flange portion 14 by a laser welding device, for example, the lower surface 14b of the inner flange portion 14 is colored or a material that absorbs laser light is provided on the lower surface 14b. Also, the heat-shrinkable film 13 is made transparent or translucent so as to transmit the laser. By doing so, the heat-shrinkable film 13 can be adhered to the inner flange portion 14 by a laser welding device.

DESCRIPTION OF SYMBOLS 1... Heating container 2... Lower plate (container main body) 3... Middle plate 5... First compartment 6... Second compartment 12a... Opening on inner peripheral side of inner flange part 13... Heat contraction Film (partition portion) 14 Inner flange portion (partition portion) 15 Bottom portion 20 Ultrasonic welding device 24 Adhesion portion.

Claims (5)

A heating container that is divided into at least a first compartment and a second compartment by a partition, and that the partition opens when heated,
a container body with an upper opening; an inner flange portion protruding toward the inner periphery of the container body at an intermediate portion in the depth direction of the container body; an opening on the inner periphery side of the inner flange portion; and a heat-shrink film adhered to the lower surface of the inner flange portion so as to close the inner flange portion, and the partition portion is formed by the inner flange portion and the heat-shrink film,
The inner flange portion and the heat-shrinkable film are heated so that when the container body is heated to the heating temperature of the contents in the container body, the heat-shrinkable film is heat-shrunk and peeled off from the inner flange portion. glued,
At the bonding portion between the inner flange portion and the heat shrinkable film, the inner flange portion and the heat shrinkable film are bonded to each other by forming a concave or convex shape in the thickness direction of the inner flange portion and the heat shrinkable film. An uneven part is provided , and further
The inner peripheral edge of the adhesive portion is positioned so as to recede outward in the width direction of the inner flange portion from the inner peripheral edge of the inner flange portion, and the heat-shrinkable film bends under the weight of the contents. An unbonded portion is provided between the inner flange portion and the heat-shrinkable film to create a space for the content to enter.
A heating container characterized by : The heating container according to claim 1 ,
The container main body includes an outer container having an open upper portion and an inner portion serving as the first compartment; and an inner container of
A heating container, wherein the partition portion formed by the inner flange portion and the heat-shrinkable film is provided at the bottom portion of the inner container. The heating container according to claim 1 or 2 ,
The peel strength when the heat-shrinkable film heat-shrinks and separates from the inner flange portion due to heating is smaller than the breaking strength when the heat-shrinkable film heat-shrinks and breaks when heated. A heating vessel characterized by: The heating container according to any one of claims 1 to 3 ,
A heating container, wherein the heat shrinkage of the heat shrinkable film at 100°C is 5% or more and 50% or less. The heating container according to any one of claims 1 to 4 ,
The heating container, wherein the opening is formed so as to be biased in a direction orthogonal to a vertical axis passing from the center of the container body through the center.

Images