JP6644108B2 - Packaging container - Google Patents

Description

  TECHNICAL FIELD The present invention relates to a packaging container compatible with a microwave oven, in which stored food can be heated by a microwave oven in a closed state.

  In a synthetic resin packaging container for packaging foods and the like, a fitting structure in which a container body and a lid are fitted to each other to prevent contents contained in the container from leaking out of the container is adopted. I have. A packaging container having such a fitting structure can be efficiently manufactured by performing a vacuum forming process or a pressure forming process on a heated synthetic resin sheet.

  In a packaging container having such a fitting structure, when the contents such as the stored food and the like are heated by a microwave oven, the contents generate steam, so it is necessary to discharge the steam to the outside of the container. Become. As a method of discharging the vapor out of the container, there are a method of forming a vent hole in the container and a method of forming a ventilation path. If the vapor cannot be discharged to the outside of the container appropriately, the pressure inside the container may increase, causing a problem that the lid may come off from the container body.

  On the other hand, it is necessary to prevent dust and insects from entering before heating in a microwave oven. It is also necessary to prevent foreign matter from being mixed in the store by mischief, and from these viewpoints, a container having no gap is demanded. Further, even after the heating is completed, it is necessary to prevent intrusion of dust and insects until opening.

  As containers compatible with a microwave oven, for example, the following Patent Documents 1 and 2 have been proposed. However, the container described in Patent Literature 1 below is a container in which a plurality of pores having a maximum diameter of 1.5 mm or less are formed on the top surface of the lid, but a hole of 1 mm or 1.5 mm is formed on the top surface of the lid. If a plurality are formed, not only dust but also fly may enter the container. In addition, since a hole is already formed in the top surface of the lid before heating, the steam generated during the heating of the range can be satisfactorily discharged to the outside of the container, but the internal pressure rise in the container tends to be insufficient, and It takes longer to heat.

  Further, in the container of Patent Literature 2 described below, such a hole is not provided, and a slit is formed in the top surface of the lid, and there is no possibility that dust, fly, etc. may enter the container. In this container, in order to suppress the internal pressure rise due to steam, the space between the slits is lifted upward to form a steam discharge portion, but not only the space between the slits but also the outer portion of the slit is similarly raised by the internal pressure rise due to the steam. May be lifted. That is, the entire top surface of the lid may be lifted upward to form a steam discharge portion, in which case the lid may come off. Also, even if the worker accidentally hits the gap between the slits during the work of closing the lid with the food etc. stored in the container, the worker may not return to the original state, and the steam discharge section may remain in the state. Also, the steam discharge section may not return to the original position even after heating in the microwave oven.

JP 2018-24476 A Utility Model Registration No. 3213110

  Therefore, the present invention has been made in view of the above-mentioned conventional problems, and when heating by a microwave oven, generated steam can be discharged to the outside of the container, and before or after heating, foreign matter intrusion into the container can be prevented. An object of the present invention is to provide a microwave-compatible packaging container that can be prevented.

The present invention has been made in order to solve the above problems, and a packaging container according to the present invention includes a container body having an opening that opens upward, and a sheet made of synthetic resin. and a lid for closing the opening of fitted in the container body, a packing container of the microwavable, the top surface of the lid, recessed portion is recessed toward the lower side, the On the bottom surface of the concave portion, an elevated portion is formed that protrudes upward through the stepped portion and is curved downward, and a plurality of slits in which the sheet is cut linearly are formed at intervals on the elevated portion, Deformation suppressing ribs are formed between adjacent slits and near both ends of the slits.

  In the packaging container of this configuration, since the slit in which the sheet is cut in a straight line is formed on the top surface of the lid, in a state before heating by the microwave oven, the slit enters the container inside. Foreign substances can be prevented from entering. In addition, since the lid is provided with a slit on the top surface, when heating is performed by the microwave oven, the internal pressure of the container is appropriately increased by the steam, and the heating time is shortened. And since the slit is provided on the hill, the entire bottom surface of the concave portion is not pushed upward by the internal pressure rise due to the steam, and only the movable piece between the adjacent slits is raised above the outer portion. It rises and deforms. That is, due to the increase in the internal pressure, the movable pieces between the slits are lifted and deformed upward, while portions of the hill portion located outside the movable pieces are hardly deformed upward. As a result, a steam discharge portion is formed between the movable piece portion and a portion outside the movable piece portion, and the steam in the container can be accurately discharged to the outside from the steam discharge portion. Therefore, it is possible to prevent the lid from coming off due to an excessive increase in the internal pressure. Furthermore, since deformation suppressing ribs are formed near both ends of the movable piece, the movable piece that has floated upward and deformed during the heating of the range quickly returns to its original state after the end of the range heating, Close the steam outlet. Similarly, even if the worker inadvertently hits the movable piece during the lid closing operation and the movable piece rises to form the steam discharge section, the steam discharge section does not return to the original state, and the steam discharge section returns to the original state. Close the section. Therefore, even after the heating, as in the case before the heating, it is possible to prevent foreign matter from entering the inside of the container from the slit. By setting the length, shape, and arrangement of the deformation suppressing ribs in various ways, the steam pressure and the degree of steam discharge in the container during range heating can be easily controlled. Can also be easily adjusted.

In particular, elevation is curved in only one direction, the slit is preferably along the curved direction of elevation. The floating deformation above the movable piece between the slits due to the increase in internal pressure during heating becomes smooth, and the steam discharge is assured.Moreover, before heating and after the end of heating, it is surely returned to the original state, Even if it hits the movable piece during the operation, it will surely return to the original state.

  Moreover, it is preferable that the deformation suppressing rib straddles a virtual line connecting the ends of the adjacent slits with a straight line, and the return to the original state is further ensured.

  As described above, at the time of heating by the microwave oven, when the pressure in the container reaches a predetermined pressure, the movable piece between the slits floats with respect to the outer part, and the movable piece and the outer part The steam discharge section is formed between the container and the container, so that the generated steam can be reliably discharged to the outside of the container, the lid does not come off, and the pressure inside the container is maintained until the movable piece floats. Can be kept high, and the heating time can be shortened. Further, before and after the heating, the steam discharge portion is closed, so that entry of foreign substances such as dust and insects can be prevented. Furthermore, even if the movable piece between the slits floats up and a steam discharge portion is formed during the operation, the steam return portion returns to its original state and closes the steam discharge portion, thereby preventing foreign matter such as dust and insects from entering. be able to.

FIG. 1 is a perspective view showing an opened state of a packaging container according to an embodiment of the present invention. The top view of the lid of the packaging container. The principal part enlarged plan view of the lid of the packaging container. FIG. 4 is a sectional view taken along line PP of FIG. 3. QQ sectional drawing of FIG. FIG. 5 is an exemplary sectional view corresponding to FIG. 4 illustrating a state of the lid according to the embodiment when the microwave is heated; FIG. 6 is an exemplary sectional view corresponding to FIG. 5 and illustrating a state of the lid according to the embodiment when the microwave is heated; The principal part enlarged plan view of the lid of the packaging container in other embodiment of this invention. The principal part enlarged plan view of the lid of the packaging container in other embodiment of this invention. The principal part enlarged plan view of the lid of the packaging container in other embodiment of this invention.

  Hereinafter, a packaging container according to an embodiment of the present invention will be described with reference to FIGS. Hereinafter, the packaging container is simply referred to as a container. The container according to the present embodiment is for accommodating various foods, and is a container compatible with a microwave oven that can be heated in a microwave oven without being opened and in a closed state.

  The container includes a container body 1 and a lid 2. Both the container body 1 and the lid 2 are formed from various types of thermoforming (sheet forming) such as vacuum forming and pressure forming from a synthetic resin sheet. The shape of the container in plan view is arbitrary, and may be a round shape, an oval shape, a substantially square shape, a substantially polygonal shape, or the like, but a round shape is preferable. The container body 1 has an opening 14 that opens upward. The lid 2 fits into the container body 1 and closes the opening 14 of the container body 1. The fitting between the container main body 1 and the lid 2 is preferably an inner fitting structure in which the fitting part 23 of the lid 2 is brought into contact with the fitting part 13 of the opening 14 of the container main body 1 for fitting. By adopting the inner fitting structure, at the time of closing the lid, the sealing performance can be improved so that the stored soup does not leak. Further, a configuration in which a not-shown inner plate is accommodated between the container body 1 and the lid 2 as necessary may be employed.

  In the container body 1, jelly-like soup, noodles, oysters, and the like can be stored in advance as containers so that they can be heated and eaten as they are in a microwave oven. The container body 1 can be obtained by thermoforming a sheet using a heat-resistant resin material. The container body 1 is preferably made of a foamed heat-resistant resin material in order to use it by heating it in a microwave oven. The container body 1 is not hot when taken out of the microwave oven after heating and suppresses burns and the like. The electromagnetic waves in the range can be efficiently transmitted to the foodstuffs, and heating can be performed uniformly and in a short time.

  The container body 1 includes a bottom portion 10, a side portion 11 extending upward from an outer edge of the bottom portion 10 while expanding upward, and a flange portion 12 extending outward from an upper end of the side portion 11. I have. It is preferable that a fitting portion 13 into which the fitting portion 23 of the lid 2 fits inside is formed at an upper portion of the side surface portion 11. The fitting portion 13 has an inverted tapered shape whose diameter gradually decreases toward the upper side. The flange 12 may be provided with a knob (not shown) for facilitating opening of the lid. The bottom portion 10 may be provided with variously shaped legs (not shown). The container body 1 may be transparent, but is preferably a foamed material having heat insulation.

  The lid 2 is transparent, and the food contained in the container can be visually recognized from the outside via the lid 2. The lid 2 includes a top surface portion 20, a side surface portion 21 extending downward from an outer edge of the top surface portion 20, and a flange portion 22 extending outward from a lower end of the side surface portion 21. It has. It is preferable that a fitting portion 23 that fits inside the container body 1 is formed on the flange portion 22. The fitting portion 23 has an inverted tapered shape whose diameter gradually decreases toward the upper side. The flange portion 22 may be provided with a knob 24 for facilitating opening of the lid. In order to prevent a so-called blocking phenomenon in which the lids 2 are tightly fitted to each other and cannot be removed when a large number of the lids 2 are stacked at the time of collection, a convex portion for blocking prevention (not shown) is provided on the side surface portion 21. ) May be provided. The convex portions for preventing blocking are arranged so as to be shifted in position for each lid 2.

  It is preferable to form a stacking protrusion 25 on the peripheral edge of the upper surface of the top surface portion 20 to prevent positional displacement between the containers when the containers in the closed state are stacked up and down. The upper surface of the top surface 20 is the outer surface of the lid 2, and the lower surface of the top surface 20 is the inner surface of the lid 2. The stacking projection 25 is provided so as to project upward. The top surface portion 20 has a circular shape, but the stacking convex portion 25 extends long along the circumferential direction of the peripheral portion of the top surface portion 20 and has an arc shape. The stacking projection 25 is formed in a predetermined angle range of the entire periphery of the top surface 20. The stacking projections 25 are formed in a pair, are symmetrical to each other, and are formed at positions facing each other by 180 degrees. An inclined surface portion 26 is formed in each of two peripheral portions of the top surface portion 20 where the stacking convex portions 25 are not formed. The inclined surface portion 26 is inclined downward from the top surface portion 20 toward the side surface portion 21. The provision of the inclined surface portion 26 facilitates the winding of the band 3 described later.

  The belt 3 is wound around a position between the pair of stacking projections 25. The band 3 circulates the container in the closed state along the vertical direction. The belt-shaped body 3 passes above two regions in the peripheral edge portion of the top surface portion 20 where the stacking convex portions 25 are not formed. Therefore, the strip 3 passes above the pair of inclined surfaces 26. In plan view, the direction in which the belt-shaped body 3 is wound on the lid 2 is defined as the front-back direction, and the direction orthogonal to the front-back direction is defined as the left-right direction. The front-back direction is a direction in which the pair of inclined surface portions 26 oppose each other, and the left-right direction is a direction in which the pair of stacking convex portions 25 oppose each other. 2, 4 and 5, the front-rear direction is indicated by an arrow Y, the left-right direction is indicated by an arrow X, and the up-down direction is indicated by an arrow Z.

  A concave portion 40 for discharging steam is formed in a central region on the upper surface of the top surface portion 20 surrounded by the pair of left and right stacking convex portions 25. Although the position of the concave portion 40 is arbitrary, in the present embodiment, the concave portion 40 is biased toward one of the front and rear inclined surface portions 26. The shape of the concave portion 40 in plan view may be arbitrary and may be formed in various shapes. In the present embodiment, the concave portion 40 has a rectangular shape in plan view, and particularly has a rectangular shape long in the front-rear direction. It has a round rectangular shape.

  The bottom surface of the concave portion 40 is a curved surface curved downward. The bottom surface of the concave portion 40 may have a spherical shape curved in all directions, but preferably has a curved shape in only one predetermined direction. When the bottom surface of the concave portion 40 is curved in only one direction, the curved direction may be arbitrary and may be any direction, but in the present embodiment, the curved direction is the front-back direction, This is also the direction of the long side of the rectangular recess 40. The bottom surface of the concave portion 40 gradually descends from both ends in the front-rear direction toward the center part in the front-rear direction.

  The bottom surface of the concave portion 40 includes a reference surface portion 27 located at a peripheral portion of the bottom surface of the concave portion 40, and an elevated portion 28 located at the center side of the reference surface portion 27. The hill 28 protrudes upward with respect to the reference surface 27. A step 29 is formed at the boundary between the hill 28 and the reference surface 27. In the present embodiment, the step portion 29 has a single-stage configuration, but may have a configuration of two or more stages. The hill portion 28 is located on the center side of the reference surface portion 27 via a step portion 29. Since the hill portion 28 is one step higher than the reference surface portion 27, the protrusion amount of the hill portion 28 is smaller than the depth of the reference surface portion 27 of the concave portion 40. The protrusion amount of the hill portion 28 with respect to the reference surface portion 27 is constant over the entire hill portion 28. The hill portion 28 is curved downward, and is curved downward along the front-rear direction along with the curved shape of the bottom surface of the concave portion 40. The hill portion 28 has a shape that is long along the front-rear direction in plan view, and specifically, has a rectangular shape with the front-rear direction as a long side direction. The length of the hill portion 28 in the front-rear direction is slightly shorter than the length of the bottom surface of the concave portion 40 in the front-rear direction. It is preferable that the center line 28a along the front-back direction of the hill portion 28 coincides with the center line 28a along the front-back direction of the bottom surface of the concave portion 40.

  A slit 30 is formed in the hill 28 so as to penetrate the hill 28 inside and outside. The slit 30 penetrates the sheet constituting the lid 2 from the front and back, and is formed by cutting the sheet with a blade, but the forming method may be various. For example, the slit 30 may be formed by cutting a sheet by laser processing. When the slit 30 is formed by laser processing, it is preferable that the width of the slit 30 (the dimension of the slit 30 in a direction orthogonal to the length direction of the slit 30) is narrow. If the width of the slit 30 is too wide, steam is discharged from the slit 30 to the outside of the container before the pressure in the container reaches a predetermined pressure, and the heating time is prolonged due to insufficient pressure rise in the container. The floating deformation of the movable piece portion 33 described later also hardly occurs. Therefore, the width of the slit 30 is set to such a level that the pressure rise can be maintained and the movable piece 33 can be floated and deformed.

  Two slits 30 are formed. The slit 30 is linear and extends along the front-back direction. That is, the slit 30 extends along the curved direction of the bottom surface of the concave portion 40. Preferably, the two slits 30 are parallel to each other and have the same length as each other. The slit 30 has a length that occupies most of the entire length of the hill portion 28 in the front-rear direction. Both ends 30a of the slit 30 are separated from the both ends in the front-back direction of the hill portion 28 by a predetermined distance. The pair of left and right slits 30 are arranged symmetrically with respect to a center line 28 a along the front-back direction of the hill portion 28. Although both end portions 30a of both slits 30 have the same position in the front-rear direction, they may be slightly displaced in the front-rear direction.

  In FIG. 3, an imaginary line 32 connecting the ends 30 a of both slits 30 with a straight line is indicated by a two-dot chain line. The virtual line 32 exists before and after. The left and right two slits 30 and the two front and rear imaginary lines 32 define a rectangular movable piece 33 that is long in the front and rear direction. The movable piece 33 is curved downward along the front-rear direction.

  A deformation suppressing rib 31 is formed on the hill portion 28. The deformation suppressing rib 31 is located between the slits 30. The deformation suppressing rib 31 is formed between the slits 30 and near the end 30 a of the slit 30. The deformation suppressing ribs 31 are formed as a pair in front and rear. The front and rear deformation suppressing ribs 31 straddle the front and rear virtual lines 32, respectively. Although the shape and length of the deformation suppressing rib 31 are arbitrary, in the present embodiment, the deformation suppressing rib 31 has a long shape in the front-back direction and is located on the center line 28 a along the front-back direction of the hill portion 28. The deformation suppressing rib 31 linearly extends from an end in the front-back direction of the hill portion 28 toward a center portion of the hill portion 28 in the front-back direction. The deformation suppressing rib 31 straddles the virtual line 32 in the front-rear direction, and the virtual line 32 crosses the deformation suppressing rib 31. The deformation suppressing rib 31 only needs to intersect with the imaginary line 32, but it is particularly preferable that the rib is orthogonal. A part of the deformation suppressing rib 31 is located inside the movable piece 33, and the remaining part of the deformation suppressing rib 31 is located outside the movable piece 33. Note that the deformation suppressing rib 31 may be separated from an end of the hill portion 28 in the front-rear direction. The front and rear deformation suppressing ribs 31 are preferably located on the same line as each other, and preferably have the same length and shape, but may be different from each other. The deformation suppressing rib 31 is formed only in the vicinity of both ends 30 a of the slit 30 in the entire length of the hill portion 28 in the front-rear direction, and is not formed in the vicinity of the center of the movable piece 33. The deformation suppressing ribs 31 are formed only near both ends of the movable piece 33. The deformation suppressing rib 31 may protrude downward, but in the present embodiment, protrudes upward. The protrusion directions of the front and rear deformation suppressing ribs 31 may be different from each other.

  It is preferable that a ridge wall 34 project from the opening edge of the recess 40 so as to surround the periphery of the recess 40. The ridge wall 34 is formed on the entire periphery of the concave portion 40, but a part of the entire periphery may be cut away. A communication groove 35 is formed on the upper surface of the ridge wall 34 over the entire width of the ridge wall 34 from the inner side surface to the outer side surface. The shape and number of the communication grooves 35 are arbitrary. As shown in FIGS. 2 and 3, the communication groove 35 may have a shape extending in a direction inclined with respect to the width direction of the ridge wall 34. Although the recess 40 is covered by the strip 3, communication between the inside and the outside of the recess 40 is ensured by the communication groove 35. The vapor that has come out of the container into the recess 40 during the heating of the microwave oven can go out through the communication groove 35 to the outside. Note that a recess 41 may be separately formed on the upper surface of the top surface portion 20 and adjacent to the steam discharge recess 40 in the front-rear direction. For example, various small bags can be accommodated in the concave portion 41. In the sachet, for example, a seasoning for seasoning the food contained in the container can be put.

  A substantially horizontal edging portion 36 may be provided on the outer edge of the flange portion 12 of the container body 1 and the outer edge of the flange portion 22 of the lid 2. On the outer edge side of the edging portion 36, a large number of extremely fine irregularities may be formed to reinforce and not to cut a finger or the like even if the finger is hit. The projections and depressions are corrugated when viewed from the front, and the direction of many peaks and valleys is short in the width direction on each side, and the direction connecting the corner and the center at the corner (radiation) Direction). The unevenness is formed by, for example, knurls such as a flat knurl or a knurl, and is preferably formed by a knurl to prevent slippage.

  The container body 1 and the lid 2 (the middle plate as necessary) are made of synthetic resin such as polyethylene terephthalate, polyolefin such as polystyrene, polypropylene or polyethylene and have heat resistance usable in a microwave oven. A resin sheet can be used. Further, as these sheet materials, a sheet obtained by filling the above-mentioned synthetic resin with an inorganic substance, a foamed sheet obtained by foaming the above-mentioned synthetic resin, and a stretched sheet obtained by stretching the above-mentioned sheet can be used. Among these, a heat-resistant foamed styrene resin sheet using a heat-resistant styrene resin having excellent heat resistance as polystyrene, a sheet obtained by filling or foaming an inorganic substance into polypropylene having excellent heat resistance, polyethylene terephthalate / polystyrene, A sheet obtained by stretching a sheet of polypropylene or polyethylene and using a heat-resistant sheet having improved heat resistance can be used. In particular, among these sheets, when a sheet having excellent transparency is used for the lid 2, it is preferable because the contained food can be visually recognized, and among them, transparent polyethylene terephthalate, polystyrene, polypropylene, or the like is uniaxially stretched. Or, a biaxially stretched stretched sheet is particularly preferable because it also has the heat resistance required for microwave heating. On the other hand, a container using a heat-resistant foam material for the container body 1 is preferable because it is not hot even when it is held with bare hands when heating in a microwave oven and has excellent heat retention.

  In the container configured as described above, food is stored in the container body 1, the fitting portion 23 of the lid 2 is fitted to the fitting portion 13 of the container body 1, and the opening 14 of the container body 1 is fitted. Is closed with the lid 2. Then, the band 3 is wound around a container. Even if the worker's hand hits the inner surface of the movable piece 33 during the closing operation and the movable piece 33 moves upward, the deformation suppressing ribs 31 are formed near both ends of the movable piece 33. The movable piece 33 quickly returns to the original state, and the steam discharge section 50 is closed. Therefore, intrusion of foreign matter from the steam discharge unit 50 is prevented. Further, since the slit 30 is not a hole but a cut line obtained by cutting a sheet, it is possible to prevent foreign matter from entering when displayed at a store.

  When the stored food is heated in a microwave oven, it can be placed in a microwave oven without opening, and the strip 3 can be placed in a microwave oven without being removed. When heated in a microwave, steam is generated from the food and the pressure in the container increases. The pressure acts on the entire inner surface of the lid 2 and acts on the entire bottom surface of the concave portion 40. However, since the hill portion 28 is formed on the bottom surface of the concave portion 40, the entire bottom surface of the concave portion 40 is deformed upward. Without this, only the movable piece 33 floats and deforms upward.

  The movable piece 33 changes from the state of FIGS. 4 and 5 to the state of FIGS. 6 and 7 under the pressure in the container. As the movable piece 33 floats upward, the steam discharge portions 50 are formed between the movable piece 33 and the portions of the hill 28 on both the left and right sides. The portion of the hill portion 28 that is located outside the movable piece portion 33 is hardly inverted and curved upward due to being connected to the step portion 29, and maintains a downward curved state. On the other hand, the movable piece 33 between the two slits 30 reversely curves upward due to the pressure in the container. As a result, only the movable piece 33 of the hill 28 reversely curves upward, so that the steam discharge section 50 is formed between the movable piece 33 and the portion of the hill 28 located outside the movable piece 33. Is done. Then, the steam in the container is discharged into the recess 40 from the steam discharge portions 50 formed on the left and right sides of the movable piece 33. Although the recess 40 is covered with the strip 3, the communication groove 35 is formed in the ridge wall 34, so that the steam discharged into the recess 40 passes through the communication groove 35 to the outside of the recess 40. Is discharged. As described above, since the steam in the container is appropriately discharged to the outside, the pressure in the container is controlled, and the food is cooked uniformly and quickly.

  When the heating is completed, the movable piece 33 that has floated returns to the original state by the action of the pair of front and rear deformation suppressing ribs 31. The return of the movable piece 33 closes the steam discharge section 50 and prevents foreign matter from entering the container. In particular, since the deformation suppressing rib 31 is formed across the virtual line 32, the movable piece 33 returns to the original state smoothly and reliably. The return of the movable piece 33 can be adjusted by variously setting the length, size, shape, arrangement, and the like of the deformation suppressing rib 31.

  The shape and the like of the deformation suppressing rib 31 are arbitrary, and various types can be adopted. For example, as shown in FIG. 8, the deformation suppressing rib 31 may be thick and short. Further, as shown in FIG. 9, the deformation suppressing rib 31 may have a tapered shape toward the inside of the movable piece 33 or a triangular shape. The deformation suppressing rib 31 may have a rectangular shape in a plan view as shown in FIG. 10 instead of an elongated shape.

DESCRIPTION OF SYMBOLS 1 Container main body 2 Lid 3 Band-shaped body 10 Bottom part 11 Side part 12 Flange part 13 Fitting part 14 Opening 20 Top part 21 Side part 22 Flange part 23 Fitting part 24 Knob part 25 Stacking convex part 26 Inclined surface part 27 Reference surface (bottom)
28 Height (bottom)
28a center line 29 step 30 slit 30a end 31 deformation suppressing rib 32 virtual line 33 movable piece 34 ridge wall 35 communication groove 36 edging 40 recess 41 recess 50 steam discharge section

Claims (3)

A microwave-compatible packaging container comprising a container body having an opening that opens upward and a lid made of a synthetic resin sheet and fitted to the container body to close the opening of the container body. So,
The top surface of the lid, recessed portion is recessed toward the bottom, on the bottom surface of the recess, elevation curved downward with projecting upward through a stepped portion is formed,
In the hill portion, a plurality of slits in which the sheet is cut linearly are formed at intervals,
A container for packaging, characterized in that deformation suppressing ribs are formed between adjacent slits and near both ends of the slits. Elevation is curved in only one direction, the slits packaging container according to claim 1 wherein along the curved direction of elevation.   The packaging container according to claim 1, wherein the deformation suppressing rib straddles an imaginary line connecting ends of adjacent slits with a straight line.

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