JP2020066466A - Lid for packaging container - Google Patents

Abstract

PURPOSE: To provide a lid for a packaging container capable of efficiently discharging steam.CONSTITUTION: A lid of a packaging container according to claim 1 is provided with a spiral notch to form a valve on a lid surface part of the lid that covers a packaging container body that is intended to be heated in a microwave oven with food contained in the container body. According to claim 2 of the present invention, in the lid of the packaging container according to claim 1, the valve is formed by providing two spiral notches whose vortex directions are opposite to each other and whose centers are substantially at the same position. The lid of the packaging container according to claim 3 is provided with a spiral-like notch with continuous linear notch to form the valve on the lid surface part of the lid that covers the packaging container body that is intended to be heated in the microwave oven with food contained in the container body.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a lid of a food packaging container used for housing lunch boxes and various types of cooked foods, and more specifically, is provided with a mechanism for discharging steam generated when heated in a microwave oven to the outside. At the same time, it relates to a lid of a packaging container capable of preventing foreign matter such as insects from entering.

  At retail stores such as supermarkets and convenience stores, bento boxes and various types of cooked foods are packaged in packaging containers and displayed in large numbers.

  Such a packaging container includes a container body configured to accommodate food and the like, a lid body detachably attached to an opening portion of the container body, and an opening of the container body containing the lid body. It is provided with a film wrapping material for fixing the container body and the lid in a state of being attached to the section.

  As described above, the packaging container in which foods and the like are stored and then packaged in a film is often heated by using a microwave oven as it is in a film package.

  In the packaging container used for the above-mentioned applications, while ensuring the tightness so that the liquid juice of the food contained in the container body does not leak outside, the steam generated when heated in a microwave oven Therefore, it is required that steam be discharged outside the container so that the container does not expand excessively or burst. Therefore, a valve is provided on the lid or a hole is provided to release water vapor to the outside.

  Patent Document 1 discloses a packaging container in which fitting of corner portions is partially released by the pressure of water vapor generated inside the container when heated in a microwave oven to release water vapor to the outside. Patent Document 2 discloses a packaging container in which at least one of the flange of the container body and the flange of the lid body is provided with an exhaust hole.

  Patent Document 3 discloses a packaging container in which a valve is formed by providing a notch in a lid of the packaging container to allow vapor to escape.

  Patent Document 4 discloses a packaging container in which a lid is provided with an exhaust hole by irradiating a laser beam.

  Patent Document 5 discloses a lid for a packaging container in which a top surface of a lid has a concave surface and a cutout is provided in the concave surface.

JP 2001-97436 A JP, 2007-276835, A Registered utility model publication No. 3138601 JP, 2017-81599, A Registered Utility Model Publication No. 3213110

  As described above, it is desirable that the container in which the food or the like is packaged is provided with a means for allowing steam to escape when heated in a microwave oven.

  When the valve 3 is provided by providing the lid 1 with the notch 2 as shown in FIG. 17 as such means, if the notch 2 has a short length, the container main body 4 containing the food (not shown) is covered with the microwave oven. When heated by, the valve 3 is difficult to lift, and there is a problem that vapor discharge does not work well.

  Therefore, an object of the present invention is to provide a lid for a packaging container that can efficiently discharge steam.

  The configuration of the present invention that solves the above problems is as follows.

  (1) The lid of the packaging container according to claim 1 has a spiral shape on the lid surface portion of the lid that covers the packaging container body that is planned to be heated in a microwave oven with food contained in the container body. A notch was made to form the valve.

  (2) According to the invention described in claim 2, in the lid of the packaging container according to claim 1, the spiral directions are opposite to each other, and two spiral cuts whose centers are substantially at the same position are provided. The valve was formed.

  (3) The lid of the packaging container according to claim 3 has a linear shape on the lid surface portion of the lid that is put on the packaging container body that is planned to be heated in a microwave oven with food contained in the container body. The valve was formed by making a series of cuts in the same manner to form cuts having a shape similar to a spiral.

  In each of the packaging containers according to the present invention, the valve is formed by providing the spiral or spiral-like cut as described above.

  Then, as compared with the valve 3 formed by providing a non-spiral cut as shown in FIG. 17, the cut length becomes longer if the valve areas are substantially the same.

  When the cut length is increased in this way, the force that resists the pressure of steam inside the packaging container main body becomes weak, that is, the valve is lifted more easily.

  That is, according to the present invention, it is possible to provide a lid for a packaging container capable of efficiently discharging steam.

Explanatory view of the invention according to claim 1 Same, front view (rear view, left and right side views also appear the same) Same, plan view Same, bottom view AA line sectional view Explanatory perspective view of the invention according to claim 2 Same, front view (rear view, left and right side views also appear the same) Same, plan view Same, bottom view BB line sectional view Explanatory perspective view of the invention according to claim 3 Same, front view (rear view, left and right side views also appear the same) Same, plan view Same, bottom view CC cross section Explanatory plan view showing another embodiment Explanatory perspective view showing a conventional example Explanatory cross section

  First, preferred embodiments of the components of the present invention will be outlined below with reference to the drawings. The embodiments of the constituent elements of the present invention are not limited to the following embodiments, and various forms can be adopted as long as they are within the technical scope of the present invention. In the figure, U indicates upward and S indicates downward.

  Second, the invention according to claim 1 will be outlined below.

  The lid 10 of the packaging container according to the first aspect is used by being fitted into the opening 61 of the container body 60 as shown in FIG. Food is contained in the container body 60, and is heated and cooked by microwave irradiation of a microwave oven with the lid 10 covered.

  Although the lid 10 is illustrated as a circle when viewed from above, the shape thereof is appropriate depending on the opening 61 of the container body 60, and may be a polygonal shape, an elliptical shape, or the like.

  The lid 10 is formed of a synthetic resin sheet that can be mass-produced inexpensively and easily. Specifically, a thermoplastic resin sheet such as polyethylene, polypropylene, polystyrene, polyethylene terephthalate (PET resin) can be used.

  As shown in FIGS. 3, 4, and 5, the lid 10 has a valve 14 formed by forming a spiral cut 12 in the lid surface portion 11. Note that the lid surface portion is not limited to a flat plate shape as shown in the drawing, and a concave portion may be provided in the lid surface portion and a cut may be provided in the concave portion, or a convex portion or a dome shape may be formed in the lid surface portion. A protrusion may be provided and a cut may be provided in the protrusion or the protrusion.

  The notch 12 may be formed by punching with a Thomson blade, irradiating a laser beam, or other general-purpose means used when making a notch in a resin container.

  Further, the number of the cuts 12 is not limited to one as shown in FIG. 3 and the like, and a plurality of cuts 12 may be provided in parallel.

  The fitting between the container main body 60 and the lid 10 shown in FIG. 18 is a form referred to as inner fitting, and the outer peripheral portion 13 of the lid 10 is fitted into the opening 61 of the container main body 60. Of course, the fitting form may be an outer fitting other than the illustrated inner fitting. For example, the edge of the lid covers the opening of the container body from the outside.

  The present invention is formed by bringing a synthetic resin sheet into close contact with and heating it in a mold with vacuum, compressed air, or vacuum compressed air.

  Further, the lid is a broad concept, and the middle plate 70 that may be interposed between the lid 10 and the container body 60 shown in FIG. 1 is also included in the concept of the lid as being covered by the container body 60. It is something. Then, a cut 72 may be provided in the lid surface portion 71 of the inner plate 70. By providing the spiral cut 72 in the inner plate 70, the gelatinized soup stock placed on the inner plate 70 is heated to be liquefied and dropped into the container body through the cut, and at the same time, in the container body. It is possible to obtain the effect that the water vapor is discharged from the cut.

  Thirdly, the invention according to claim 2 will be outlined below.

  The lid 20 of the packaging container according to the second aspect is used by being fitted into the opening 61 of the container body 60 as shown in FIG. Food is stored in the container body 60, and is heated and cooked by microwave irradiation of a microwave oven with the lid 20 covered.

  The lid 20 is illustrated as a circle when viewed from above, but its shape is appropriate depending on the opening 61 of the container body 60, and may be polygonal, elliptical, or the like.

  The lid 20 is formed of a synthetic resin sheet that can be inexpensively and conveniently mass-produced. Specifically, a thermoplastic resin sheet such as polyethylene, polypropylene, polystyrene, polyethylene terephthalate (PET resin) can be used.

  As shown in FIG. 8, FIG. 9, and FIG. 10, in the lid 20, notches 22 and 22 similar to the Fermat's helix are formed in the lid surface portion 21, that is, the vortex directions are reversed, and the centers are at substantially the same position. Two spiral cuts 22, 22 are provided. The valve 24 is formed by providing the notches 22 and 22. Note that the lid surface portion is not limited to a flat plate shape as shown in the drawing, and a concave portion may be provided in the lid surface portion and a cut may be provided in the concave portion, or a convex portion or a dome shape may be formed in the lid surface portion. A protrusion may be provided and a cut may be provided in the protrusion or the protrusion.

  The notch 22 may be formed by punching with a Thomson blade, irradiating a laser beam, or other general-purpose means used when making a notch in a resin container.

  The fitting of the container main body 60 and the lid 20 shown in FIG. 18 is a form referred to as inner fitting, and the outer peripheral portion 23 of the lid 20 is fitted into the opening 61 of the container main body 60. Of course, the fitting form may be an outer fitting other than the illustrated inner fitting. For example, the edge of the lid covers the opening of the container body from the outside.

  The present invention is formed by bringing a synthetic resin sheet into close contact with and heating it in a mold with vacuum, compressed air, or vacuum compressed air.

Further, the lid is a broad concept, and the inner plate 70 that may be interposed between the lid 20 and the container body 60 shown in FIG. 6 is also included in the concept of the lid as being covered with the container body 60. It is something. Then, a cut 73 may be provided in the lid surface portion 71 of the inner plate 70. By providing the spiral cut 73 in the inner plate 70, the gelatinized soup stock placed on the inner plate 70 is liquefied by being heated and drips into the container body through the cut, and at the same time, in the container body. It is possible to obtain the effect that the water vapor is discharged from the cut.

  Fourth, the invention according to claim 3 will be outlined below.

  The lid 30 of the packaging container according to the third aspect is used by being fitted into the opening 61 of the container body 60 as shown in FIG. Food is contained in the container body 60, and is heated and cooked by microwave irradiation of a microwave oven with the lid 30 covered.

  Although the lid 30 is illustrated as a circular shape when viewed from above, the shape thereof is appropriate depending on the opening 61 of the container body 60, and may be a polygonal shape, an elliptical shape, or the like.

  The lid 30 is formed of a synthetic resin sheet that can be mass-produced inexpensively and easily. Specifically, a thermoplastic resin sheet such as polyethylene, polypropylene, polystyrene, polyethylene terephthalate (PET resin) can be used.

  As shown in FIGS. 11, 13, and 14, the lid surface portion 31 of the lid 30 is provided with a notch 32 in which a linear notch is continuous to form a spiral shape. The valve 34 is formed by providing the cut 32. Note that the lid surface portion is not limited to a flat plate shape as shown in the drawing, and a concave portion may be provided in the lid surface portion and a cut may be provided in the concave portion, or a convex portion or a dome shape may be formed in the lid surface portion. A protrusion may be provided and a cut may be provided in the protrusion or the protrusion.

  The number of the cuts 32 is not limited to one as shown in FIG. 11 and the like, and a plurality of cuts 32 may be provided in parallel. Alternatively, as shown in FIG. 16, two cuts 32 may be provided so as to spiral in opposite directions.

  The notch 32 may be formed by punching with a Thomson blade, irradiating a laser beam, or other general-purpose means used when making a notch in a resin container.

  The fitting between the container body 60 and the lid 30 shown in FIG. 18 is a form referred to as inner fitting, and the outer peripheral portion 33 of the lid 30 is fitted into the opening 61 of the container body 60. Of course, the fitting form may be an outer fitting other than the illustrated inner fitting. For example, the edge of the lid covers the opening of the container body from the outside.

  The present invention is formed by bringing a synthetic resin sheet into close contact with and heating it in a mold with vacuum, compressed air, or vacuum compressed air.

  Further, the lid is a broad concept, and the inner plate 70 that may be interposed between the lid 30 and the container body 60 shown in FIG. 11 is also included in the concept of the lid as being covered on the container body 60. It is something. Then, the cut 74 may be provided in the lid surface portion 71 of the inner plate 70. By providing the notch 74 in the inner plate 70, the gelatinized soup placed on the inner plate 70 is heated to be liquefied and drip into the container body from the notch, and the water vapor in the container body is removed. It is possible to obtain the effect of being discharged from the cut.

10 ... Lid 11 ... Lid surface portion 12 ... Notch 13 ... Outer circumferential portion 14 ... Valve 20 ... Lid 21 ... Lid surface portion 22 ... Notch 23 ... Outer circumferential portion 24 ... Valve 30 ... Lid 31 ...・ Lid surface portion 32 ・ Notch 33 ・ ・ Outer peripheral portion 34 ・ ・ Valve

Claims (3)

A lid for covering a packaging container body that is planned to be heated in a microwave oven with food stored inside the container body,
A lid for a packaging container in which a valve is formed by providing a spiral cut in the lid surface portion.   The lid of the packaging container according to claim 1, wherein the valve is formed by providing two spiral cuts whose vortex directions are opposite to each other and whose centers are substantially at the same position. A lid for covering a packaging container body that is planned to be heated in a microwave oven with food stored inside the container body,
A lid for a packaging container in which a valve is formed by providing a linear cut on the lid surface to form a cut similar to a spiral.

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