JP4339448B2 - Container for microwave oven - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a container for a microwave oven, and more particularly to a container for a microwave oven that can prevent the contents from being scattered in the microwave oven.
[0002]
[Prior art]
Conventionally, containers for microwave ovens having various forms have been developed and proposed.
[0003]
Such a container for a microwave oven includes a container body having a flange portion and a lid member bonded to the flange portion. Both the container body and the lid material have a gas barrier base material, which prevents permeation of oxygen gas, water vapor, and the like, improves its gas barrier property, and protects its contents.
[0004]
In such a microwave container, as the contents, various foods and drinks are filled, and when eating the contents, for example, part of the lid is peeled off, and the microwave container is placed in the microwave oven. After placing and heat-treating the contents, the contents are eaten.
[0005]
[Problems to be solved by the invention]
However, when a part of the lid is peeled from the microwave oven container and the microwave oven container is placed in the microwave oven and heated, the contents may evaporate (bump) from the container body and scatter. In this case, it is conceivable that the container main body and the lid member are covered with an overcap. However, the internal pressure in the container main body is increased by the overcap, and it is expected that the contents are blown out or the overcap is detached.
[0006]
The present invention has been made in consideration of such points, and provides a container for a microwave oven that can prevent the contents in the container body from scattering and can prevent the internal pressure in the container body from increasing. With the goal.
[0007]
[Means for Solving the Problems]
The present invention includes a container main body having a flange portion at the upper end, opened at the top and containing contents, a lid member bonded to the flange portion of the container main body, and an overcap fitted into the flange portion of the container main body. The container body and the lid material have retort-proof performance, and the overcap is connected to the outer peripheral edge of the upper plate that covers the opening of the container main body, and descends downward to face the flange portion. A peripheral rib that protrudes outwardly from the peripheral skirt, and a passage rib that forms a passage that communicates the inside of the container body and the outside of the container body between the flange portion and the upper plate. A peripheral plate that contacts the upper surface of the flange portion is provided between the peripheral skirt and an additional passage rib that forms a passage that communicates the inside of the container main body and the outside of the container main body. A protruding peripheral rib protruding upward is provided between the upper plate and the peripheral plate, and the container body has a peripheral side wall portion constituting the trunk portion, a bottom wall portion constituting the bottom portion, and a thread extending downward from the bottom wall portion. A peripheral step portion is formed by forming a groove in the outer peripheral portion of the upper plate of the overcap, and the outer diameter of the yarn bottom portion of the container body substantially matches the inner diameter of the protruding peripheral rib, or the yarn The inner diameter of the butt is approximately the same as the outer diameter of the peripheral step. It is a container for microwave ovens characterized by these.
[0008]
Generally, when a microwave container is heated in a microwave oven, the contents in the container body may bump. According to the present invention, since the opening of the container body is covered with the upper plate and the peripheral skirt of the overcap, the bumped contents are not scattered outward. Further, since the passage cap and the additional passage rib that communicate the inside and the outside of the container main body are provided in the overcap, the internal pressure of the container main body is not increased and the contents are not blown out.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
[0010]
1 to 8 are views showing an embodiment of a microwave oven container according to the present invention.
[0011]
As shown in FIG. 1, the container A for microwave ovens has the cylindrical container main body 10 which has the flange part 2 in the upper end, and the upper part opens, and the substantially disk-shaped lid | cover material adhere | attached on the flange part 2 of the container main body 10 6 and a circular overcap 20 fitted into the flange portion 2 of the container body 10 and the lid member 6.
[0012]
Among these, the container main body 10 includes a peripheral side wall portion 1 that constitutes a trunk portion, a bottom wall portion 3 that constitutes a bottom portion and is connected laterally from a lower end portion of the peripheral side wall portion 1, and a lower end portion of the peripheral side wall portion 1. , And a yarn bottom portion 4 continuously provided in the vertical direction. Further, gas barrier labels 5a and 5b made of a resin film having an inorganic oxide vapor-deposited thin film are closely adhered to the outer wall surfaces of the peripheral wall portion 1 and the bottom wall portion 3. The lid member 6 adhered to the surface of the flange portion 2 has at least a resin film having a vapor-deposited thin film of an inorganic oxide as a barrier base material layer. For this reason, the container body 10 and the lid member 6 have gas barrier properties.
[0013]
An annular stacking rib 7 is provided on the inner peripheral surface of the peripheral side wall 1 of the container body 10. By providing the annular stacking rib 7 in this manner, the container main body 10 can be stacked and the strength of the trunk portion, in particular, the drop strength can be increased.
[0014]
Next, the overcap 20 will be described with reference to FIGS. 1 and 5 to 8.
[0015]
The overcap 20 includes an upper plate 21 that covers the opening 10 a of the container body 10, a protruding peripheral rib 22 that protrudes upward provided on the outer peripheral edge of the upper plate 21, and an outer peripheral edge of the protruding peripheral rib 22. A peripheral plate 23 that contacts the upper surface and a peripheral skirt 26 that is provided on the outer peripheral edge of the peripheral plate 23 and descends downward to contact the side surface of the flange portion 2 are made of polypropylene as a whole.
[0016]
Further, the peripheral skirt 26 is provided with a passage rib 26 a that protrudes outward, and the peripheral plate 23 is also provided with an additional passage rib 23 a that protrudes outward.
[0017]
The passage ribs 26a and the additional passage ribs 23a are provided so as to communicate with each other, and communicate between the inside and the outside of the container body 10.
[0018]
A groove 24 is provided on the outer peripheral portion of the upper plate 21 of the overcap 20, and a peripheral step portion 25 is formed between the upper plate 21 and the groove 24. The outer diameter of the yarn bottom portion 4 of the container body 10 substantially matches the inner diameter of the protruding peripheral rib 22, and the yarn bottom portion 4 of the container main body 10 of the microwave oven container A is positioned below the microwave oven container A. It is possible to fit and fix to the protruding peripheral rib 22 of the overcap 20. Alternatively, the inner diameter of the yarn bottom portion 4 of the container body 10 is made to coincide with the outer diameter of the peripheral step portion 25, and the yarn cap portion 4 of the container body 10 of the microwave oven container A is positioned below the overcap of the microwave container A. You may insert and fix to the 20 peripheral step 25.
[0019]
Further, the peripheral skirt 26 contacts the side surface of the flange portion 2 as described above, and a locking rib 26b for locking the lower end of the flange portion 2 is formed in a circumferential shape inside the peripheral skirt 26. Is provided. Further, a rattle prevention rib 22 a that protrudes outward from the protruding peripheral rib 22 is provided on the outer surface of the protruding peripheral rib 22. When the plurality of overcaps 20 are stacked, the rattling prevention rib 22a abuts against the locking rib 26b of the upper overcap 20 to prevent the locking rib 26b from rattling (FIGS. 5 and 8). ).
[0020]
Further, as shown in FIGS. 5 and 8, a recess 22 b that is drawn inward of the protruding peripheral rib 22 is formed on the inner surface of the protruding peripheral rib 22. When the plurality of overcaps 20 are stacked, the recesses 22b of the upper overcap 20 come into contact with the upper surface of the protruding peripheral rib 22 of the lower overcap 20 and the upper overcap 20 sinks downward. Is to prevent.
[0021]
Further, as shown in FIG. 5, a plurality of, for example, eight reinforcing grooves 22 c are provided on the outer surface of the protruding peripheral rib 22 at a predetermined interval in the circumferential direction.
[0022]
As shown in FIG. 5, four passage ribs 26a and additional passage ribs 23a are provided at predetermined intervals in the circumferential direction. Further, eight anti-rattle ribs 22a of the protruding peripheral rib 22 are provided at predetermined intervals in the circumferential direction.
[0023]
Furthermore, the four recessed parts 22b provided in the protrusion peripheral rib 22 are provided in the circumferential direction so that the space | interval may differ. By changing the interval between the recesses 22b as described above, the recess 22b of the upper overcap 20 enters the recess 22b of the lower overcap 20, and the upper overcap 20 enters the lower overcap 20. Prevent entry.
[0024]
1 and FIGS. 5 to 8, the container body 10 is filled with contents such as a sauce for pasta from the opening 11a, and then the opening 11a heat-seals the lid 6 to the flange portion 2. Sealed.
[0025]
Next, the container body 10 and the lid material 6 use, for example, a normal retort kettle, for example, temperature, about 110 ° C. to 130 ° C., preferably about 120 ° C., pressure, 1 to 3 kgf / cm. ² Position, preferably 2.1 kgf / cm ² The heating and pressurizing treatment (retorting treatment) is performed at the front and rear positions, the time, and about 20 to 60 minutes, preferably about 30 minutes.
[0026]
As described above, the container body 10 in which the opening 10a is sealed with the lid member 6 is heat sterilized by the retort treatment as described above. Thereafter, an overcap is fitted to the container body 10 to form a final product.
[0027]
During cooking, the overcap is removed, the lid member 6 that seals the opening 10 a of the container body 10 is peeled off, and the overcap 20 is fitted into the flange portion 2 and the lid member 6 of the container body 10. Thus, the container A for microwave ovens which inserts the overcap 20 on the flange 2 and the cover material 6 of the container main body 10 is put on a microwave oven.
[0028]
In the microwave oven, the contents filled in the container body 10 are heated, and the contents become high temperature and a part thereof evaporates. In this case, since the opening 10a of the container body 10 is covered with the upper plate 21 of the overcap 20 and the flange portion 2 is covered with the peripheral skirt 26, the contents are not scattered outward. Further, the overcap 20 is provided with a passage rib 26a and an additional passage rib 23a. The passage 30 formed by the passage rib 26a and the passage 31 formed by the additional passage rib 23a allow the inside and outside of the container body 10 to be externally arranged. Therefore, the vapor in the container body 10 is sequentially discharged through the additional passage rib 23a and the passage rib 26a. For this reason, the internal pressure in the container body 10 does not rise abnormally and the contents are not blown out.
[0029]
Next, the container body 10 and the lid member 6 will be described in more detail with reference to FIGS. As shown in FIG. 2, a seal projection 8 may be provided on the top surface of the flange 2 of the container body 10 and a reinforcing projection 9 that hangs down from the outer end of the flange 2 may be provided.
[0030]
Further, as shown in FIG. 3, the flange portion 2 of the container main body is downward with a constant angle α ° with respect to the upper end of the peripheral side wall portion 1, that is, the horizontal line 1 indicated by a dotted line extending from the horizontal line connecting the openings 10a. It inclines and is continued outward from the upper end of the peripheral side wall part 1. Further, a seal projection 8 may be provided on the top surface of the flange 2 and a reinforcing projection 9 that hangs down from the outer end of the flange 2 may be provided.
[0031]
In the above, the fixed angle α ° is about 1 ° to 10 °, preferably 2 ° to 5 °.
[0032]
In the present invention, as described above, the seal protrusion 8 and the reinforcement protrusion 9 are provided on the flange portion 2, and the flange portion 2 is inclined downward, whereby the tight adhesion by heat sealing or the like with the lid member 6. Can be improved. Further, when the microwave oven container A is manufactured by tightly bonding the lid material 6 by heat sealing or the like, and the microwave oven container A is retorted, the lid material 6 and the flange portion 2 are closely bonded. It is possible to prevent the internal pressure from being concentrated on one point, to disperse the internal pressure and to have a function to withstand the internal pressure, to improve the opening property of the lid member 6 at the time of opening, and to open easily.
[0033]
Further, in the present invention, by providing the reinforcing projection 9 that hangs down from the outer end of the flange portion 2, the strength of the flange portion 2 itself can be improved, and further, deformation of the flange portion 2 can be prevented when the lid is opened. Smooth opening can be realized. Furthermore, even when the container A falls from the surface of the flange portion 2, the flange portion 2 is rigid and can prevent the lid member 6 from peeling off.
[0034]
By the way, in this invention, the molding method is demonstrated about the container main body 10 concerning this invention. There are various molding methods. As an example, a molding method for an in-mold labeling injection molded container will be described. As shown in FIG. 4, the core mold 11, the cavity mold 12, the runner 13, the gate port 14, the vacuum suction devices 15, 16, and 17 attached to the core mold 11, the cavity mold 12, and the like. An injection mold M is used. First, a label 5a in which at least a resin film having an inorganic oxide vapor-deposited thin film is laminated as a barrier base material layer in the layer structure is attached to the peripheral side wall portion 1 constituting the body portion of the container body 10. Vacuum suction is applied to the inner wall surface of the cavity mold 12 using the vacuum suction devices 15 and 16 so as to closely adhere to a position corresponding to the entire surface of the outer wall surface.
[0035]
Similarly, a label 5b in which at least a resin film having an inorganic oxide vapor-deposited thin film is laminated as a barrier base material layer in the layer structure is attached to the bottom wall 3 constituting the bottom of the container body 10. The top surface of the core mold 11 is fixed by vacuum suction using the vacuum suction device 17 or the like so as to be closely bonded to a position corresponding to the entire surface of the outer wall surface. Next, the core mold 11 is fixed to the cavity mold 12, and then, a molding resin melted in a space formed by the cavity mold 12 and the core mold 11 with a heating cylinder (not shown). 18 is injected from the gate port 14 through the runner 13. At this time, an injection-molded container 19 is molded corresponding to the shape of the space part, and the above-described label 8a is melted and integrated on the entire outer wall surface of the peripheral side wall part 1 constituting the injection-molded container 19 for tight adhesion. Can be made. Similarly, the above-mentioned label 8b is melted and integrated and tightly bonded to the entire outer wall surface of the bottom wall portion 3 constituting the injection-molded container 19, and then cooled and solidified to take out the molded product to manufacture the container body 10. be able to.
[0036]
In the above injection molding, the label 5b is attached to the inner wall surface of the core mold 11 by vacuum suction using the vacuum suction device 17 or the like. Next, by injection molding, the label 5b is melted and integrated on the entire surface of the injection molding container 19 and is closely bonded. In this case, the resin flows in from the central opening of the label 5b, and the inflowed resin pushes the label 5b downward, so that the label 5b is melted and integrated on the entire surface of the injection molding container 19 to be tightly bonded. Can do.
[0037]
In the molding method described above, the core mold and the cavity mold are configured so that the inner surface P of the crossing portion of the bottom wall portion 3 and the peripheral side wall portion 1 is formed in a curved shape. The corner portion is also formed in a curved surface shape.
[0038]
In the present invention, a resin film having at least a vapor-deposited thin film of an inorganic oxide is laminated on the outer wall surface of the peripheral side wall 1 and the bottom wall 3 of the container body 10 as a barrier base material layer. The labels 5a and 5b are closely bonded. Moreover, the cover material 6 in which at least a resin film having an inorganic oxide vapor-deposited thin film is laminated as a barrier base material layer in the layer structure is closely adhered to the surface of the flange portion 2. At this time, since the resin film having an inorganic oxide vapor-deposited thin film as a barrier base material can transmit an electron beam of a microwave oven, it can maintain gas barrier properties against oxygen gas, water vapor, etc. It is possible to eat heated or cooked food and drink over the range.
[0039]
In the above, as the cover material 6, it is preferable that the inner surface layer is a resin layer having heat sealability with the surface of the flange portion 2 or with the seal projection provided on the top surface. .
[0040]
Further, as the lid member 6, it is desirable to use a material having at least the property of shielding light such as sunlight, the property of not transmitting oxygen gas, water vapor, water, and the like. It may be a material, or a composite base material formed by combining two or more kinds of base materials.
[0041]
Specifically, for example, a resin film having a deposited thin film of an inorganic oxide such as silicon oxide or aluminum oxide having a barrier property against oxygen gas, water vapor, or the like can be used.
[0042]
In addition to the above-described resin film having an inorganic oxide vapor-deposited thin film, low density polyethylene, medium density polyethylene, high density polyethylene, linear low density polyethylene, polypropylene, ethylene- Films or sheets of resins such as propylene copolymers, polyester resins having gas barrier properties, nylon resins (polyamide resins), polyvinyl alcohol, etc. In addition, films or sheets of various colored resins having light-shielding properties obtained by adding desired additives and kneading to form a film can be used in combination.
[0043]
The thickness of the film or sheet is arbitrary, but is usually about 5 μm to 300 μm, more preferably about 10 μm to 100 μm.
[0044]
In addition, in the above, a deposited thin film of inorganic oxide having a thickness of 50 angstroms to 1000 angstroms can be used.
[0045]
In the present invention, it is possible to extrude and laminate the aforementioned heat-sealable resin on the barrier base material as described above, or dry laminate and bond these resin films. it can.
[0046]
Moreover, in said cover material 6, a polyester-type resin can be used as a base film which show | plays the basic function as the cover material 6, for example.
[0047]
As the resin film or sheet, any of an unstretched film or a stretched film stretched in a uniaxial direction or a biaxial direction can be used.
[0048]
In the present invention, the lid material can be manufactured by using a material as described above and utilizing a laminating method described later.
[0049]
Next, the material etc. which comprise the container main body 10 are demonstrated. First, as the molding resin constituting the container body 10, for example, high-density polyethylene, medium-density polyethylene, low-density polyethylene, linear (linear) low-density polyethylene and other polyethylene-based resins, polypropylene, copolymers thereof, and the like Various moldings such as polypropylene resin, polystyrene resin, butadiene-styrene copolymer, acrylonitrile-butadiene-styrene copolymer, (meth) acrylic resin, polyester resin, polyamide resin, polycarbonate resin, etc. Resin can be used.
[0050]
Next, the labels 5a and 5b arranged in the container body 10 will be described. First, as a material constituting the innermost layer of the labels 5a and 5B, various polyethylene resins such as high density polyethylene, medium density polyethylene, low density polyethylene, linear (linear) low density polyethylene, and the like, Polypropylene resin and other resin films or sheets can be used.
[0051]
In the polyethylene-based resin, these coextruded films or sheets can also be used.
[0052]
As the resin film or sheet as described above, an unstretched film or a stretched film or sheet stretched in a uniaxial or biaxial direction can be used, and its thickness is about 6 to 100 μm, preferably It is desirable to use a thing in the range of about 12-50 micrometers.
[0053]
As the material constituting the innermost layer of the labels 5a and 5b, when the molding resin constituting the injection molding container is injected and adhered to the labels 5a and 5b, it has heat sealability and melts to each other. However, it is desirable to use a resin film or sheet having the property of being closely bonded.
[0054]
Next, in the present invention, it is desirable to use a material having rigidity and excellent properties in mechanical, physical, chemical, etc. as a basic material constituting the labels 5a and 5b. Specifically, for example, a strong resin film or sheet such as a polyester resin (polyethylene terephthalate resin), a polypropylene resin, a polyacetal resin, or the like can be used.
[0055]
As the resin film or sheet constituting the labels 5a and 5b, it is desirable to use a stretched film stretched in the biaxial direction.
[0056]
In addition, the thickness of the resin film or sheet may be a thickness that can be held to the minimum necessary for strength, rigidity, etc., and if it is too thick, there is a disadvantage of increasing the label cost, If it is too thin, strength, rigidity and the like are lowered, which is not preferable.
[0057]
In the present invention, for the reasons described above, about 10 to 50 μm, preferably about 12 to 30 μm is most desirable.
[0058]
Moreover, in this invention, as a material which comprises label 5a, 5b with the resin film which has the vapor deposition thin film of said inorganic oxide, the property which permeate | transmits light, such as sunlight, permeation | transmission of water vapor | steam, water, etc., for example. Low density polyethylene, medium density polyethylene, high density polyethylene, linear low density polyethylene, polypropylene, ethylene-propylene copolymer and other resin films or sheets having barrier properties that can be prevented, oxygen gas, water vapor, etc. Film or sheet of resin such as polyester resin, polyvinyl alcohol, etc. that has gas barrier properties to prevent permeation, and colorants such as pigments to the resin, other desired additives are added and kneaded to form a film Can be used in combination with various colored resin films or sheets with light-shielding properties. .
[0059]
These materials can be used alone or in combination.
[0060]
The thickness of the film or sheet constituting the labels 5a and 5b is arbitrary, but is usually about 6 to 100 μm, and more preferably about 7 to 30 μm.
[0061]
Further, in the above, a deposited thin film of inorganic oxide having a thickness of about 50 angstroms to 1000 angstroms can be used.
[0062]
Moreover, as a resin film which supports said vapor deposition film, a polyester film can be used, for example.
[0063]
Incidentally, since the labels 5a and 5b are usually subjected to severe physical and chemical conditions, severe conditions are required for the laminated material constituting the labels 5a and 5b. Various conditions such as impact strength, pinhole resistance, heat resistance, sealability, quality maintenance, workability, hygiene, etc. are required. For this reason, in the present invention, in addition to the above materials, In addition, other materials that satisfy the above-described conditions can be used arbitrarily.
[0064]
In the present invention, the film or sheet constituting the labels 5a and 5b may be any of unstretched, uniaxially or biaxially stretched.
[0065]
The thickness is arbitrary, but can be selected from a range of several μm to 300 μm.
[0066]
Furthermore, in the present invention, the film or sheet constituting the labels 5a and 5b may be a film having any property such as extrusion film formation, inflation film formation, and coating film.
[0067]
Next, in the present invention, the entire surface of the outer side wall surface of the peripheral side wall portion and the bottom wall portion constituting the in-mold labeling injection molded container using the label forming laminated material manufactured by laminating the above materials. Manufactures a label that adheres tightly.
[0068]
That is, using the above-mentioned laminated material, depending on the size of the in-mold labeling injection molding container, etc., close contact with the entire outer wall surface of the peripheral side wall and the bottom wall part constituting the in-mold labeling injection molding container, respectively. The outer wall surface label to be worn is punched and manufactured.
[0069]
Further, in the present invention, the outer wall surface labels 5a and 5b as described above are mounted in an injection mold using a vacuum suction device or the like, and then an injection molding resin is injected into the present invention. Such an in-mold labeling injection molded container can be manufactured.
[0070]
【Example】
Next, the present invention will be described in more detail with reference to examples.
[0071]
Example 1
Polyurethane adhesive is 4g / m thick on the surface of biaxially stretched polypropylene film with 30μm thickness. ² Biaxially stretched with a thickness of 12 μm formed by coating (dry state) to form an adhesive layer, and further printing a predetermined printed pattern on one surface of the adhesive layer to form a printed layer A polyethylene terephthalate film was dry laminated.
[0072]
Next, on the biaxially stretched polyethylene terephthalate film surface, a polyurethane-based adhesive having a thickness of 4 g / m is applied in the same manner as described above. ² (Dry state) is coated to form an adhesive layer, and further, a biaxially stretched polyethylene terephthalate film having a thickness of 12 μm having a deposited thin film of silicon oxide having a thickness of 200 angstroms on the surface of the adhesive layer. Dry lamination was performed with the deposited thin film surfaces of silicon oxide facing each other.
[0073]
Thereafter, on the biaxially stretched polyethylene terephthalate film surface of the biaxially stretched polyethylene terephthalate film having the silicon oxide vapor-deposited thin film, a polyurethane-based adhesive was further added in a thickness of 4 g / m as described above. ² (Dry state) is coated to form an adhesive layer, and then the surface of the adhesive layer is dry laminated with a 30 μm thick biaxially stretched film having a polypropylene resin as a main component and heat sealability. A laminated material for label formation was manufactured.
[0074]
An outer peripheral surface label 5a that uses the above-mentioned laminated material for label formation and is tightly bonded to the entire outer wall surface of the peripheral side wall portion that constitutes an injection molding container of a predetermined size, and a bottom wall that also constitutes an injection molding container The bottom surface label 5b (perforated label) to be tightly bonded to the entire outer wall surface of the part was punched and manufactured.
[0075]
Next, the outer peripheral surface label 5a and the bottom surface label 5b manufactured above are placed in the core mold and the cavity mold so that the biaxially stretched coextruded film surface having heat sealability is in contact with the molding resin. It was mounted on the wall surface while being fixed by vacuum suction using a vacuum suction device or the like.
[0076]
Next, the core mold is fixed to the cavity mold, and then the polypropylene resin melted by the heating cylinder is injected from the gate port into the space formed by the cavity mold and the core mold through the runner. Then, a container conforming to the shape of the space of the mold is formed, and the label is melted and integrated with the outer wall surface of the peripheral side wall portion of the trunk portion and the outer wall surface of the bottom wall portion constituting the container. After that, the container body 10 was manufactured by cooling and solidifying it and taking out the molded product (see FIG. 1).
[0077]
The container body 10 manufactured above is filled with pasta sauce (meat sauce) as the contents to be filled and packaged from the opening 10a, and then the opening 10a is unstretched with a thickness of 60 μm whose inner surface has heat sealability. Biaxially stretched polyethylene terephthalate having a thickness of 12 μm, comprising a polypropylene resin film layer, and further having a biaxially stretched nylon film having a thickness of 15 μm and a deposited thin film of silicon oxide having a thickness of 200 angstroms as a barrier substrate. The films were laminated, and further, sealed as a base film with a lid 6 made of a laminated biaxially stretched polyethylene terephthalate film having a thickness of 12 μm.
[0078]
Next, the container body 10 and the lid member 6 are put into a retort kettle, and the temperature, 120 ° C., pressure, 2.1 kgf / cm. ² A retort treatment (heat sterilization treatment) was performed under the retort treatment conditions consisting of 30 minutes, and a retort-treated microwave oven container A was produced.
[0079]
The retort-treated microwave oven container A did not show deformation of the container body 10 and was excellent in contents filling and packaging suitability, retort treatment suitability, distribution suitability, storage stability, and the like.
[0080]
In addition, the above-described microwave oven container A was excellent in oxygen permeability, moisture permeability, etc. without being broken even when dropped from a height of 50 cm five times.
[0081]
Next, when the contents of the above-described microwave oven container A are eaten, the lid 6 of the container A is peeled off, and the overcap 20 is put into a microwave oven with a rated high-frequency output of 500 W. When heated in a microwave oven for 5 minutes, the contents suddenly boiled but were prevented from spilling out of the container. After that, I was able to eat it while it was heated over pasta.
[0082]
Example 2
A predetermined printing pattern is printed on one surface of a biaxially stretched polypropylene film having a thickness of 30 μm to form a printing layer. Next, a polyurethane-based adhesive is formed on the printing layer with a thickness of 4 g / m. ² An adhesive layer was formed by coating in a dry state, and a biaxially stretched polyethylene terephthalate film having a deposited thin film of silicon oxide having a thickness of 200 angstroms was dry laminated on the surface of the adhesive layer.
[0083]
Next, the biaxially stretched polyethylene terephthalate film having the silicon oxide vapor-deposited thin film is applied to the biaxially stretched polyethylene terephthalate film surface of the dry laminate. ² (Dry state) is coated to form an adhesive layer, and then a biaxially stretched film with a thickness of 30 μm having a heel seal property as a main component is dry laminated on the surface of the adhesive layer. A laminated material for label formation was manufactured.
[0084]
A container body 10 according to the present invention was manufactured in the same manner as in Example 1 above using the above-mentioned laminated material for forming a label (see FIG. 1). In addition, the flange part 2 of said container main body 10 provided inclining below 3 degrees with respect to the horizontal line of the opening 10a.
[0085]
The container body 10 manufactured above is filled with pasta sauce (carbonara) as the contents from the opening 10a, and then the opening 10a has a heat-sealing property and has an unstretched polypropylene thickness of 50 μm. A biaxially stretched polyethylene terephthalate film having a thickness of 15 μm and having a thin film of aluminum oxide having a thickness of 200 angstroms as a barrier base material. The container A for microwave ovens was manufactured by sealing with the laminated lid 6.
[0086]
Next, the container body 10 and the lid member 6 are put into a retort kettle, and the temperature, 120 ° C., pressure, 2.1 kgf / cm. ² A retort treatment (heat sterilization treatment) was performed under the retort treatment conditions consisting of 30 minutes, and a retort-treated microwave oven container A was produced.
[0087]
The retort-treated microwave oven container A did not show deformation of the container body 10 and was excellent in contents filling and packaging suitability, retort treatment suitability, distribution suitability, storage stability, and the like.
[0088]
Further, the container A was excellent in oxygen permeability, moisture permeability, etc. without being broken even when dropped 5 times from a height of 50 cm.
[0089]
Next, the container A was peeled off, covered with an overcap 20, placed in a microwave oven with a rated high frequency output of 600 W, and heated in a microwave oven for 1.5 minutes. However, it was prevented from spilling out of the container. Then, it was able to be eaten in the state heated with pasta.
[0090]
【The invention's effect】
As described above, according to the present invention, when the microwave oven container is heated in the microwave oven, the contents inside the container body may bump, but the opening of the container body is covered by the upper plate and the peripheral skirt. As a result, the bumped contents will not be scattered outside and blown out. In addition, since the overcap is provided with passage ribs and additional passage ribs that allow the inside and outside of the container body to communicate with each other, when the contents in the container body boil, the steam generated from the contents is added to the additional passage ribs and passages. It is discharged outward through the ribs. For this reason, the internal pressure of the container body does not rise and the contents are not blown out.
[Brief description of the drawings]
FIG. 1 is a schematic view showing an embodiment of a container for a microwave oven according to the present invention.
FIG. 2 is a schematic enlarged sectional view showing another example of the container body.
FIG. 3 is a schematic enlarged sectional view showing still another example of the container body.
FIG. 4 is a schematic cross-sectional view showing a method for forming a container body.
FIG. 5 is a plan view showing an overcap.
FIG. 6 is a cross-sectional view showing a state in which the overcap and the flange portion are in close contact with each other.
FIG. 7 is a cross-sectional view showing a passage formed between an overcap and a flange portion.
FIG. 8 is a cross-sectional view showing a state where overcaps are stacked.
[Explanation of symbols]
A Microwave Oven
1 peripheral side wall
2 Flange
3 Bottom wall
4 Yarn bottom
5a label
5b label
6 Lid
7 Annular stacking rib
10 Container body
10a opening
20 Overcap
21 Upper plate
22 Protruding peripheral rib
23 Perimeter plate
23a Additional passage rib
24 groove
25 Peripheral step
26 Perimeter skirt
26a passage rib

Claims (1)

A container body that has a franchise at the upper end, opens upwards and stores contents,
A lid material bonded to the flange portion of the container body;
An overcap fitted into the flange of the container body,
The container body and lid material have anti-retort processing performance,
The overcap has an upper plate that covers the opening of the container main body, and a peripheral skirt that is connected to the outer peripheral edge of the upper plate and descends downward to contact the side surface of the flange portion.
Protruding outward to the peripheral skirt and providing a passage rib that forms a passage communicating with the inside of the container body and the outside of the container body between the flange portion,
Between the upper plate and the peripheral skirt, a peripheral plate that contacts the upper surface of the flange portion is provided,
The peripheral plate is provided with an additional passage rib that is continuous with the passage rib and forms a passage that communicates the inside of the container body and the outside of the container body .
Protruding peripheral ribs projecting upward between the upper plate and the peripheral plate are provided ,
The container body has a peripheral side wall portion that constitutes the body portion, a bottom wall portion that constitutes the bottom portion, and a yarn bottom portion that extends downward from the bottom wall portion,
Form a groove on the outer periphery of the top plate of the overcap to provide a peripheral step,
A container for a microwave oven, characterized in that the outer diameter of the yarn bottom portion of the container body substantially matches the inner diameter of the protruding peripheral rib, or the inner diameter of the yarn bottom portion substantially matches the outer diameter of the peripheral step portion .

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