JP7139914B2 - microwave heating paper container - Google Patents

Description

TECHNICAL FIELD The present invention relates to a microwave-heatable paper container that contains contents and is heated by a microwave oven.

A conventional microwave heating paper container is disclosed in Patent Document 1. This microwave heating paper container is formed by bending one blank plate, and a plurality of side plates are erected from a rectangular bottom plate. Adjacent side plates are connected by folding pieces folded in two. A top plate is connected to the upper ends of a pair of opposing side plates via a folding line, respectively, and a flap is connected to the upper ends of the other pair of opposing side plates via a folding line, respectively. The upper surface of the microwave heating paper container is opened and closed by folding the upper surface plate from the side surface plate. The folded piece is glued onto the side plate provided with the flap.

The microwave heating paper container containing the contents is cooked by microwave heating in a microwave oven with the top plate open or closed.

Japanese Patent Application Laid-Open No. 2008-68885 (pages 5 to 8, FIG. 6)

In the microwave heating paper container having the above configuration, when the top plate is closed and the fluid contents such as rice porridge are cooked, the steam generated inside is generated in the gap between the top plate and the side plate and the inner surface of the folded piece folded in two. emitted in between. At this time, since the flow path formed between the inner surfaces of the folded pieces is narrow, there is a problem that the contents will spill out from the folded pieces when the contents are bumped and pressure is applied.

SUMMARY OF THE INVENTION An object of the present invention is to provide a microwave-heatable paper container that can prevent contents from spilling over.

In order to achieve the above object, the present invention provides a microwave heating paper container formed by a laminate in which a resin film is arranged on the inner surface of a paper layer, in which a rectangular bottom plate is folded from two opposite sides of the bottom plate. a pair of bent first side plates; a pair of second side plates bent from two opposite sides of the bottom plate and disposed between the first side plates; a plurality of folded pieces that are joined to the two side plates and are folded in half along a folding line extending from the top of the bottom plate and adhered to the outer surface of the first side plate; the first side plate or the second side plate; A top plate that opens and closes the top surface by bending from the top end of the side plate, and the first side plate in a state where the distance between the top ends of the facing first side plates is shorter than the length of the top end of the second side plate. It is characterized by comprising a locking portion for locking.

According to this configuration, the first side plate is locked by the locking portion during cooking in the microwave oven, and steam is discharged through the channel between the inner surfaces of the folded pieces. At this time, since the distance between the upper ends of the first side plate is shorter than the length of the upper end of the second side plate, a wide flow path is formed between the inner surfaces of the folded pieces.

Further, according to the present invention, in the microwave oven heating paper container having the above configuration, the upper surface plate is bent from the upper end of the first side surface plate, and the locking portions provided on the upper surface plates are engaged with each other so that the It is characterized by locking the first side plate.

Further, according to the present invention, in the microwave heating paper container having the above structure, the engaging portion is formed by a notch extending in the facing direction of the second side plate.

Further, according to the present invention, in the microwave heating paper container having the above structure, the top flap is formed so as to be cut off by bending from the upper end of the second side plate.

In addition, in the microwave heating paper container having the above structure, the present invention provides assistance for locking the first side plate in a state in which the distance between the upper ends of the first side plate is substantially equal to the length of the upper end of the second side plate. A locking portion is provided on each of the top plates.

Further, according to the present invention, in the microwave oven heating paper container having the above structure, the auxiliary locking portion is formed by a notch extending from the tip of the top plate in the opposite direction of the first side plate.

Further, according to the present invention, there is provided the microwave heating paper container having the above configuration, which includes a pair of upper flaps bent from the upper end of the first side plate, and the upper plate is bent from the upper end of the second side plate. The locking portion has a slit provided in the top plate, and an insertion piece provided in the top flap and inserted into the slit.

According to the present invention, the locking portion is provided for locking the first side plate when the distance between the opposing upper ends of the first side plate is shorter than the length of the upper end of the second side plate. Therefore, the first side plate can be locked by the locking portion during cooking, and the steam flow path formed between the inner surfaces of the folded pieces can be widened. Therefore, it is possible to prevent the contents from spilling over from the folding piece when the fluid contents are bumped.

BRIEF DESCRIPTION OF THE DRAWINGS The perspective view which shows the microwave oven heating paper container of 1st Embodiment of this invention. FIG. 2 is a perspective view showing an open state of the microwave heating paper container according to the first embodiment of the present invention. FIG. 2 is a plan view showing a blank plate of the microwave heating paper container according to the first embodiment of the present invention; FIG. 2 is a cross-sectional view showing the layer structure of the blank plate of the microwave heating paper container according to the first embodiment of the present invention. A plan view showing a blank plate of a microwave heating paper container according to a second embodiment of the present invention. The perspective view which shows the state at the time of packaging of the microwave oven heating paper container of 2nd Embodiment of this invention. The perspective view which shows the state at the time of packaging of the microwave oven heating paper container of 3rd Embodiment of this invention. A plan view showing a blank plate of a microwave heating paper container according to a third embodiment of the present invention. FIG. 11 is a perspective view showing a state of the microwave heating paper container according to the third embodiment of the present invention during cooking.

<First embodiment>
Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a perspective view of the microwave heating paper container of the first embodiment. FIG. 2 is a perspective view showing a state in which the upper surface of the microwave heating paper container is opened. A microwave heating paper container 1 (hereinafter referred to as "paper container 1") is formed by folding a laminate blank plate 30 (see FIG. 3) including a paper layer 31, and stores food.

The paper container 1 has a tubular body 3 and a bottom plate 5 (see FIG. 3) that closes the bottom surface of the paper container 1, and has a bottomed tubular container 16 for containing contents. The upper surface of the storage section 16 is opened and closed by the upper surface plate 8 . The paper container 1 is shrink-wrapped with a shrink film (not shown) in a state where the contents are stored and the top plate 8 is closed.

The bottom plate 5 is formed in a rectangular shape, and the body portion 3 is formed by a pair of side plates 6 (first side plate) and a pair of side plates 7 (second side plate). The side plate 6 is bent from two opposite sides of the bottom plate 5 . The side plates 7 are bent from two opposite sides of the bottom plate 5 and arranged between the side plates 6 . Adjacent side plates 6 and 7 are connected by folding pieces 11 . The folding piece 11 is folded in two and adhered onto the outer surface of the side plate 6 .

A pair of top plates 8 are bent from the upper end of each side plate 6 . Also, a pair of upper flaps 9 are provided which are bent from the upper end of each side plate 7 .

FIG. 3 shows a plan view of a blank plate 30 with the paper container 1 unfolded. The paper container 1 is assembled by folding a single blank plate 30 along the folding lines 20 and 21 . The folding lines 20 are formed by ruling, and the folding lines 21 are formed by perforations (indicated by thick lines in the drawing) in which cuts are arranged at predetermined intervals. The folding lines 21 may be formed by ruling.

The blank plate 30 is formed point-symmetrically with respect to the center of the rectangular bottom plate 5 . The side plate 6 is connected to one of two opposing sides of the bottom plate 5 via a folding line 20 , and the side plate 7 is connected to the other two opposing sides via a folding line 20 . The side plates 6 and 7 are bent upright from the bottom plate 5 to form the body portion 3 (see FIG. 1).

A top flap 9 is connected to the side plate 7 via a folding line 21 on the opposite side of the bottom plate 5 . A top plate 8 is connected to the side plate 6 via a folding line 21 on the opposite side of the bottom plate 5 . A protruding portion 8a is provided at the open end of the upper surface plate 8, and a notch 8b is formed extending from the base of the protruding portion 8a in the direction in which the side plate 7 faces.

A substantially triangular folding piece 11 is continuously provided via a folding line 20 between the adjacent side plates 6 and 7 . The folded piece 11 is folded in half along the folding lines 20 extending from each vertex of the bottom plate 5 and adhered to the outer surface of the side plate 6 with a double-sided adhesive tape or the like.

FIG. 4 is a sectional view showing the layer structure of the blank plate 30. As shown in FIG. The blank plate 30 is formed of a laminated body in which a protective layer 33 of a resin film is arranged on the inner surface side of a paper layer 31 . The paper layer 31 is made of paperboard. The basis weight of the paper layer 31 is, for example, 270-550 g/m ² , more preferably 350-450 g/m ² . A print layer 31a for displaying a pattern is formed on the outer surface of the paper layer 31 by printing.

The protective layer 33 is formed of a resin film such as polyethylene terephthalate, and waterproofs the inner surface of the storage section 16 (see FIG. 2) to prevent the contents from leaking out.

The protective layer 33 and the paper layer 31 are adhered by dry lamination to form an adhesive layer 32 made of acrylic adhesive, urethane adhesive or the like.

In FIG. 1 described above, a pair of point-symmetrical top plates 8 are inserted into each other on the notches 8b, so that the top plates 8 are engaged to close the top surface of the storage section 16 (see FIG. 2). At this time, the side plates 6 are locked in a state in which the distance L1 between the upper ends of the opposing side plates 6 is shorter than the length L2 of the upper ends of the side plates 7 . That is, the cut 8b constitutes a locking portion that locks the pair of side plates 6 in a state where the distance L1 is shorter than the length L2.

The distance L1 is the sum of the distance L3 from the fold line 21 of one top plate 8 to the cut 8b and the distance L4 from the fold line 21 to the cut 8b of the other top plate 8 (see FIG. 3). . Although the distance L3 and the distance L4 are equal in this embodiment, they may be different.

Since the distance L1 between the upper ends of the side plates 6 is shorter than the length L2 of the upper ends of the side plates 7, wide flow paths 11a are formed between the inner surfaces of the folded pieces 11 adhered to the side plates 6. FIG.

In the paper container 1 configured as described above, when cooking rice porridge, for example, an appropriate amount of water is poured into the container 16 containing rice, ingredients, etc., and the upper plate 8 is closed and the container is put into the microwave oven. The contents are heated by microwaves, and cooking is completed after a predetermined time has passed. As a result, the top plate 8 can be opened to eat rice porridge.

Steam generated from the contents during cooking is discharged through the gap between the top plate 8 and the body 3 and through the flow path 11a formed between the inner surfaces of the folded pieces 11. As shown in FIG. At this time, the distance L1 is made shorter than the length L2 to widen the flow path 11a, so that even if the fluid content such as rice porridge boils, it can be prevented from spilling over from the folding piece 11.例文帳に追加

Moreover, it is more desirable to cut off the top flap 9 along the folding line 21 of the perforations during cooking. As a result, steam is easily released from the gap between the top plate 8 and the body portion 3, and the pressure of the contents flowing into the flow path 11a can be reduced when the contents are bumped. Therefore, it is possible to more reliably prevent the contents from spilling out of the folding piece 11. - 特許庁

According to this embodiment, the side plates 6 are locked in a state where the distance L1 between the upper ends of the opposing side plates 6 (first side plate) is shorter than the length L2 of the upper ends of the side plates 7 (second side plate). A locking portion (notch 8b) is provided. Therefore, the side plate 6 is locked by the locking portion, and the steam flow path 11a formed between the inner surfaces of the folded pieces 11 adhered to the outer surface of the side plate 6 can be formed widely. Therefore, it is possible to prevent the content from spilling over from the folding piece 11 when the fluid content is bumped.

Further, the top plate 8 is bent from the upper end of the side plate 6, and the locking portions (notches 8b) provided on each top plate 8 are engaged with each other to lock the side plate 6. As shown in FIG. This makes it possible to easily realize a locking portion that locks the side plate 6 when the distance L1 is shorter than the length L2.

In addition, since the cuts 8b extend in the facing direction of the side plates 7, the side plates 6 are not separated from each other by the engagement of the cuts 8b, so that the engagement portion can be formed more reliably. In addition, the cut 8b may be parallel to the direction in which the side plate 7 faces, or may be inclined.

Further, the upper flap 9 is formed so as to be cut off by bending from the upper end of the side plate 7 . Therefore, by cutting off the top flap 9 during cooking, it is possible to more reliably prevent the contents from spilling out from the folded piece 11.例文帳に追加

In the present embodiment, the notch 8b provided in the top plate 8 forms a locking portion for locking the side plate 6, but the locking portion may be formed in the top plate 8 by another configuration. For example, the top plate 8 is provided with a concave portion in which one side of the projecting portion 8a is inclined so that the width of the projecting portion 8a narrows as it approaches the side plate 6, and a locking portion that locks the side plate 6 by engagement of the concave portion. may be formed. Alternatively, one upper plate 8 may be provided with a slit and the other upper plate 8 may be provided with an inserting piece, and the inserting piece may be engaged with the slit to form a locking portion for locking the side plate 6 . .

Alternatively, the upper plate 8 may be provided only on one of the side plates 6, and the engaging portion may be formed by an insertion piece connected to the tip of the upper plate 8 via a folding line. At this time, the length of the upper surface plate 8 in the direction in which the side surface plate 6 faces is formed shorter than the length L2 of the upper end of the side surface plate 7 . Thus, by inserting the insertion piece between the other side plate 6 and the upper flap 9, the side plate 6 can be locked with the distance L1 being shorter than the length L2.

<Second embodiment>
Next, FIG. 5 shows a plan view of the blank plate 30 of the paper container 1 of the second embodiment. For convenience of explanation, the same parts as those of the first embodiment shown in FIGS. 1 to 4 are given the same reference numerals. In this embodiment, the top plate 8 is provided with cuts 8c and 8d. Other parts are the same as in the first embodiment.

The notches 8c, 8d are provided at the open end of the top plate 8 and extend in opposite directions of the side plate 6. As shown in FIG. The notch 8c is formed on the protruding portion 8a, and the notch 8d is formed at a position facing the notch 8c of the other top plate 8. As shown in FIG.

FIG. 6 is a perspective view showing the paper container 1 during packaging. The paper container 1 at the time of packaging is shrink-wrapped by closing the top plate 8 by engaging the notch 8c and the notch 8d while the engagement of the notch 8b is released. In the paper container 1 during cooking, the notches 8b are engaged with each other as shown in FIG.

Since the notches 8b of the paper container 1 are not engaged with each other during packaging, the side plates 6 are locked in a state in which the distance between the upper ends of the side plates 6 is approximately equal to the length L2 of the upper ends of the side plates 7. FIG. In other words, the cuts 8c and 8d form auxiliary locking portions for locking the side plates 6 when the distance between the upper ends of the side plates 6 is substantially equal to the length L2 of the upper ends of the side plates 6 during packaging.

When the paper container 1 is shrink-wrapped with the notches 8b engaged with each other as in the first embodiment, the gap between the shrink film covering the folded piece 11 and the side plate 6 is large. For this reason, the shrink film is easily torn when the projection comes into contact with it.

By shrink-wrapping the paper container 1 by locking the side plate 6 with the auxiliary locking portion, the gap between the side plate 6 and the shrink film covering the folding piece 11 can be reduced. Thereby, the shrink film can be made difficult to tear.

According to this embodiment, the same effects as those of the first embodiment can be obtained. Each top plate 8 is provided with auxiliary locking portions (notches 8c and 8d) for locking the side plate 6 in a state in which the distance between the upper ends of the side plates 6 is substantially equal to the length L2 of the upper end of the side plate 7. . As a result, the paper container 1 is shrink-wrapped in a state in which the auxiliary locking portions are engaged, thereby making it difficult for the shrink film to tear.

In addition, the notches 8c and 8d extending in the opposite directions of the side plate 6 can easily form the auxiliary locking portions.

Although the auxiliary locking portions are formed by the cuts 8c and 8d in this embodiment, the auxiliary locking portions may be formed by other configurations. For example, the auxiliary locking portion may be formed by a notch extending from the side edge of the protruding portion 8a in the facing direction of the side plate 7. As shown in FIG. Alternatively, one upper plate 8 may be provided with a slit and the other upper plate 8 may be provided with an insertion piece, and the insertion piece may be engaged with the slit to form an auxiliary locking portion for locking the side plate 6. good.

<Third Embodiment>
Next, FIG. 7 shows a perspective view of the paper container 1 during packaging according to the third embodiment. For convenience of explanation, the same parts as those of the first embodiment shown in FIGS. 1 to 4 are given the same reference numerals. In this embodiment, the top plate 8 is connected to the side plate 7 , and the locking portions are provided on the top plate 8 and the top flap 9 . Other parts are the same as in the first embodiment.

The folding piece 11 of the paper container 1 is adhered to the outer surface of the side plate 6 as in the first embodiment. A pair of upper surface flaps 9 are bent from the upper end of each side plate 6 (first side plate), and a pair of upper surface plates 8 are bent from the upper end of each side plate 7 (second side plate). A protruding portion 8a is provided at the open end of the upper surface plate 8, and a notch 8b is formed extending from the base of the protruding portion 8a in the direction in which the side plate 6 faces.

The paper container 1 is shrink-wrapped with a shrink film (not shown) in a state in which the contents are accommodated and the top plate 8 is closed by engagement of the notches 8b. At this time, the distance between the upper ends of the side plates 6 is substantially equal to the length L2 of the upper ends of the side plates 7 .

FIG. 8 shows a plan view of the blank plate 30 with the paper container 1 unfolded. The top plate 8 is connected to the side plate 7 via a folding line 21, and recessed portions 8e formed by notches are provided at both ends thereof. As a result, the width L5 between both side ends of the top plate 8 above the recess 8e is shorter than the length L2 of the top end of the side plate 7. As shown in FIG.

A slit 8f extending in the opposite direction of the side plate 7 is arranged in the upper plate 8 so as to be biased to one side. At the periphery of the slit 8f, both ends of the semi-annular incision are connected by a straight fold line 21 of perforations. The slit 8f may be formed by a straight cut, but if it is formed by a semi-circular cut and a folding line 21 of perforations, an insertion piece 9b, which will be described later, can be easily inserted. Moreover, since a part of the peripheral edge of the slit 8f is formed by the folding line 21 of the perforations, it is possible to prevent the generation of punching scraps.

The top flap 9 is connected to the side plate 6 via a folding line 21 . A width L6 between both side ends of the top flap 9 is formed shorter than a length L7 of the top end of the side plate 6. - 特許庁Therefore, the top flap 9 can be fitted into the recess 8e of the closed top plates 8 by engagement of the notches 8b.

The top flap 9 is provided with an insertion piece 9b that can be inserted into the slit 8f through a curved notch 9a. Folding lines 20 extending toward the open end of the top flap 9 are provided at both ends of the notch 9a. Thereby, the insertion piece 9b can be easily inserted into the slit 8f.

FIG. 9 shows a perspective view of the paper container 1 during cooking. When the paper container 1 is cooked, the top plate 8 is closed by the engagement of the cut 8b, and the top flap 9 is put on the top plate 8. - 特許庁The insertion piece 9b of the top flap 9 is inserted into the slit 8f of the top plate 8. As shown in FIG. At this time, the slit 8f and the insertion piece 9b are arranged so that the lower end of the top flap 9 enters the recess 8e and the side plate 6 contacts the side edge of the top plate 8. As shown in FIG.

Therefore, the distance L1 between the upper ends of the side plates 6 is approximately equal to the width L5 of the upper plate 8, and the distance L1 is shorter than the length L2 of the upper ends of the side plates 7. As shown in FIG. That is, the slit 8f and the insertion piece 9b constitute a locking portion that locks the side plate 6 in a state where the distance L1 between the upper ends of the side plates 6 facing each other is shorter than the length L2 of the upper end of the side plate 7. As shown in FIG.

As a result, the steam flow path 11a formed between the inner surfaces of the folded pieces 11 adhered to the outer surface of the side plate 6 is widened. Therefore, it is possible to prevent the fluid content from spilling over from the folding piece 11 even if the content is bumped.

According to the present embodiment, as in the first embodiment, the locking portion that locks the side plate 6 in a state where the distance L1 between the upper ends of the side plates 6 facing each other is shorter than the length L2 of the upper end of the side plate 7 (Slit 8f, insertion piece 9b) are provided. Therefore, the side plate 6 is locked by the locking portion, and the steam flow path 11a formed between the inner surfaces of the folded pieces 11 adhered to the outer surface of the side plate 6 can be formed widely. Therefore, it is possible to prevent the content from spilling over from the folding piece 11 when the fluid content is bumped.

A top plate 8 provided with a slit 8f is bent from the upper end of the side plate 7, and a top flap 9 provided with an insertion piece 9b is bent from the upper end of the side plate 6. As shown in FIG. The side plate 6 is locked by inserting the insertion piece 9b into the slit 8f and engaging it. Thereby, the locking portion for locking the side plate 6 can be easily realized.

INDUSTRIAL APPLICABILITY According to the present invention, it can be used as a paper container for microwave heating in which fluid contents are stored and heated by a microwave oven.

1 paper container 3 trunk 5 bottom plate 6 side plate (first side plate)
7 side plate (second side plate)
8 top plate 8a protrusion 8b, 8c, 8d notch 8e recess 8f slit 9 top flap 9a notch 9b insertion piece 11 folded piece 11a channel 16 storage portion 20, 21 folding line 30 blank plate 31 paper layer 32 adhesive layer 33 protective layer

Claims (7)

A microwave heating paper container formed by a laminate in which a resin film is arranged on the inner surface of a paper layer, comprising: a rectangular bottom plate; a pair of first side plates bent from two opposite sides of the bottom plate; a pair of second side plates arranged between the first side plates by bending two opposite sides of the bottom plate; and a bottom plate connecting the first side plates and the second side plates. A plurality of folded pieces that are folded in half on a fold line extending from the apex of the first side plate and adhered to the outer surface of the first side plate; An upper plate that opens and closes, and a locking portion that locks the first side plate in a state where the distance between the upper ends of the opposing first side plates is shorter than the length of the upper ends of the second side plates. A microwave heating paper container characterized by: The top plate is bent from the upper end of each of the first side plates, and the locking portions provided on the top plates are engaged with each other to lock the first side plate. Item 1. The microwave heating paper container according to item 1. 3. The microwave heating paper container according to claim 2, wherein the engaging portion is formed by a notch extending in the opposite direction of the second side plate. 4. The microwave heating paper container according to claim 2 or 3, further comprising an upper flap formed so as to be cut off by bending from the upper end of the second side plate. Each of the top plates is provided with an auxiliary locking portion that locks the first side plate in a state in which the distance between the top ends of the first side plate is substantially equal to the length of the top end of the second side plate. The microwave heating paper container according to any one of claims 2 to 4. 6. The paper container for microwave heating according to claim 5, wherein the auxiliary locking portion is formed by a notch extending from the tip of the top plate to the facing direction of the first side plate. a pair of upper flaps bent from the upper end of the first side plate, the upper plate being bent from the upper end of the second side plate, and the locking part provided in the upper plate; and a slit provided in the upper plate. , and an insertion piece provided on the top flap and inserted into the slit.

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