WO2016088839A1

WO2016088839A1 - Microwave packaging bag

Info

Publication number: WO2016088839A1
Application number: PCT/JP2015/084030
Authority: WO
Inventors: 大輔山嵜
Original assignee: キョーラク株式会社
Priority date: 2014-12-03
Filing date: 2015-12-03
Publication date: 2016-06-09
Also published as: JP6492592B2; JP2016108001A

Abstract

The purpose of the present invention is to provide a microwave packaging bag enabling excellent discharge of steam even when the content therein has a high boiling point. This microwave packaging bag includes: a main body that is formed into a bag shape by thermally fusing together the peripheral edges of at least one film; and a flap (18) that is provided at a position biased outward from the center of the main body in a first direction while spanning the width of the main body in a second direction, and formed into a steepled configuration by a portion of the at least one film. A steam-releasing seal part (18e) is provided to the flap (18) and also provided so as to protrude toward the center of the main body. The steam-releasing seal part (18e) is formed into an irregular V-shaped configuration constituted from a first V-shaped part (30) that is continuous from a band-like seal part (18f) and missing a tip part thereof, and a second V-shaped part (40) that is continuous at a different angle from both inclined sides (31) of the first V-shaped part (30).

Description

Microwave packaging bag

The present invention relates to a microwave packaging bag.

Conventionally, in a microwave packaging bag made of a film, a technique has been proposed in which the film is partially peeled off automatically due to an increase in the internal vapor pressure by heating, and the vapor is extracted (see, for example, Patent Document 1).

6A is a plan view schematically showing a conventional steam vent seal portion of Patent Document 1, FIG. 6B is an enlarged view of a portion C of FIG. 6A, and FIG. 6C is a steam vent shown in FIG. It is a figure which shows the state which the seal | sticker part peeled. In addition, in FIG. 6, a dot pattern shows the state (heat-welded state) sealed.

6A is provided on a flap 101 formed on a packaging bag body (not shown). As shown in FIG. 6B, the outer contour line 102 of the steam release seal portion 100 is composed of a pair of inclined portions 102a and a straight portion 102b that connects the tips of the pair of inclined portions 102a. The inner contour line 103 of the steam release seal portion 100 includes a pair of inclined portions 103a and a straight portion 103b that connects the tips of the pair of inclined portions 103a.

When the contents stored in the packaging bag body are heated in the microwave oven and the vapor pressure rises, force is applied intensively to the straight portion 103b of the inner contour line 103. Peeling begins, and the peeling stops when the straight portion 102b of the outer contour line 102 is exceeded. As a result, the steam port 105 (see FIG. 6C) having a width corresponding to the length L4 of the straight portion 102b of the outer contour line 102 is opened, and the steam passes through the steam port 105 to the outside.

By the way, there are cases where foods such as baked food having a boiling point of 100 ° C. or higher (for example, 120 to 130 ° C.) are used for the packaging bags for microwave ovens. In this case, since it is difficult for the vapor pressure to increase during heating, it is difficult to exhaust the vapor sufficiently with the opening width of the conventional vapor port 105, and the user opens the package while the temperature of the contents remains high. Become.

International Publication No. 2013/100060

This invention is made | formed in view of such a situation, The objective is to provide the packaging bag for microwave ovens which can discharge | emit vapor | steam satisfactorily even when the boiling point of the content is high. is there.

In order to achieve such an object, the present invention is grasped by the following configuration.
(1) The present invention is a packaging bag for a microwave oven, and a main body formed in a bag shape by thermally welding peripheral portions of one or more films, and an outer side than a central portion in the first direction of the main body. And a flap formed in the shape of a palm by a part of the one or more films, the seal having a predetermined width inside the flap. The seal part includes a steam vent seal part, and a strip-shaped seal part extending from the steam vent seal part to both ends in the second direction of the main body, the steam vent seal part, A first V-shaped portion that is provided so as to protrude toward the central portion of the main body, is continuous from the belt-shaped seal portion, and a tip portion is notched, and a different angle from both oblique sides of the first V-shaped portion A variant V composed of a second V-shaped part that continues with Characterized in that it is formed into a shape.

(2) According to the present invention, in the configuration of (1), the first V-shaped portion has an acute virtual tip portion, and the second V-shaped portion has an obtuse tip portion. Features.

(3) In the configuration of the above (1) or (2), the present invention is such that the second V-shaped part has an obtuse rectangular inner contour line and is continuous with the first V-shaped part. , Having a narrower width than other parts.

(4) In the configuration according to (3), the second V-shaped portion has a flat outer contour line parallel to the straight portion of the inner contour line, and the outer contour line is It is characterized by being formed longer than the straight line portion of the inner contour line.

According to the present invention, it is possible to provide a microwave oven packaging bag capable of discharging steam well even when the boiling point of the contents is high.

It is a perspective view of the packaging bag for microwave ovens concerning the embodiment of the present invention. FIG. 2 is a sectional view taken along line AA in FIG. 1. (A) is a top view which shows typically the steam release seal part which concerns on embodiment, (b) is the B section enlarged view of (a), (c) has peeled the steam release seal part shown by (b). It is a figure which shows a state. It is operation | movement explanatory drawing of the packaging bag for microwave ovens. It is a figure explaining the other example of the packaging bag for microwave ovens, and is the figure drawn corresponding to FIG. (A) is a plan view schematically showing a conventional steam vent seal part, (b) is an enlarged view of part C of (a), (c) is a state where the steam vent seal part shown in (b) is peeled off. FIG.

(Embodiment)
DESCRIPTION OF EMBODIMENTS Hereinafter, a mode for carrying out the present invention (hereinafter referred to as “embodiment”) will be described in detail with reference to the accompanying drawings. The same number is attached | subjected to the same element through the whole description of embodiment.

(Overall structure of packaging bag for microwave oven)
First, the whole structure of the packaging bag 10 for microwave ovens which concerns on embodiment is demonstrated based on FIG. 1, FIG.

As shown in FIG. 1, the microwave packaging bag 10 is formed by thermally welding the peripheral portions of one or more films (in this example, the first film 11 on the front side of the rectangle and the second film 12 on the back side of the rectangle). And a main body 20 formed in a bag shape.

As a constituent material of the 1st film 11 and the 2nd film 12, if the films are materials which can be heat-welded, it is arbitrary, for example, the plastic film which has the heat seal property used for a normal packaging bag is applied. Is possible. Examples of the plastic film include a single-layer film made of a thermoplastic resin having heat-sealability, a multilayer film in which sheets of thermoplastic resin having heat-sealability are laminated with other thermoplastic resins, and the like. . Examples of the material having good heat sealability include known low density polyethylene, linear low density polyethylene, medium density polyethylene, high density polyethylene, polypropylene, propylene-ethylene copolymer, ethylene-vinyl acetate copolymer. Olefin resins such as olefin resins graft-modified with an ethylenically unsaturated carboxylic acid or its anhydride, polyamides or copolyamide resins having a relatively low melting point or a low softening point, polyester or copolyester resins, polycarbonate resins, etc. It is done. Moreover, various barrier films can be used as another plastic material to be laminated. In the case where a laminated film is used, it is preferable that the thermoplastic resin layers having a good heat seal property such as a resin having a low melting point be heat-welded with the inner surfaces thereof.

The main body 20 includes an end seal portion 13 that becomes a bottom portion when the contents are filled, an opening portion 15 that is not thermally welded toward the upper side when the contents are filled, and side portions of the first film 11 and the second film 12. And left and right side seal portions 16 formed by heat-welding each other. The microwave packaging bag 10 is a space formed between the first film 11 and the second film 12 and surrounded by the left and right side seal portions 16 and the end seal portion 13, and can accommodate contents. 17. In the microwave packaging bag 10, after filling the contents from the opening 15 into the accommodating portion 17 with the opening 15 facing upward, the opening 15 is thermally welded and sealed. Various display units 21 that display images, characters, and the like related to products can be printed on the first film 11 and the second film 12.

As shown in FIG. 2, one of the two films (here, the first film 11) has a flap 18 formed between the left and right side seal portions 16.

The flap 18 is located at a position that is biased to the outside (end seal portion 13 side) of the center portion in the extending direction of the side seal portion 16 (corresponding to the “first direction” in the present invention). It is provided over the entire width in the extending direction (corresponding to the “second direction” in the present invention). The flap 18 is formed in a palm shape by a part of one or more films (here, a part of the first film 11), and the pair of plane parts 18a to be folded and the upper side parts of the pair of plane parts 18a are connected to each other. It has the return part 18b to connect, and the communication part 18c which is formed in the lower side part of a pair of plane part 18a, and is connected to the accommodating part 17. The length h of the flap 18 (corresponding to the distance from the folded portion 18b to the communication portion 18c) can be set as appropriate.

Return to Figure 1. As shown in FIG. 1, the flap 18 has a seal portion having a predetermined width therein. This seal portion includes left and right side seal portions 18d formed by heat welding the left and right side portions of the pair of flat surface portions 18a, and a steam release seal that can be peeled off when the microwave packaging bag 10 is heated. 18e, and a belt-like seal portion 18f extending from the steam release seal portion 18e to the left and right side seal portions 18d. Further, the flap 18 is provided between the steam vent seal portion 18e and the folded portion 18b, and flaps the steam from the steam vent seal portion 18e when the steam vent seal portion 18e is peeled off due to an increase in the steam pressure in the accommodating portion 17. 18 has a notch 18g that escapes from the inside to the outside. FIG. 1 shows a semicircular cut 18g formed along the steam release seal portion 18e as an example of the cut 18g. The left and right ends of the folded portion 18b located on the left and right side portions of the flat portion 18a are portions where the side portions of the flat portion 18a are not thermally welded to each other. An unsealed portion 23a that escapes from the inside to the outside is formed.

(Configuration of strip-shaped seal portion 18f and steam vent seal portion 18e)
Next, the structure of the strip | belt-shaped seal | sticker part 18f and the steam release seal | sticker part 18e is demonstrated based on FIG. 3A is a plan view schematically showing the belt-like seal portion 18f and the steam vent seal portion 18e, FIG. 3B is an enlarged view of a portion B of FIG. 3A, and FIG. 3C is the steam vent seal shown in FIG. It is a figure which shows the state which the part peeled. In addition, a dot pattern shows the state by which a pair of plane part 18a is heat-welded.

As shown in FIG. 3A, the belt-like seal portion 18f is formed in a taper shape, and the seal width gradually widens from the start point P1 of the steam release seal portion 18e toward the left and right end portions of the flap 18. (Seal width r1 <seal width r2). The steam release seal portion 18 e is provided so as to protrude toward the central portion side of the main body 20, and is formed in a modified V-shape formed by the first V-shaped portion 30 and the second V-shaped portion 40. .

As shown in FIG. 3B, the first V-shaped portion 30 is formed in a shape that is continuous from the belt-shaped seal portion 18f and has a tip portion cut away, and a pair of oblique sides 31 and inner contours of both oblique sides 31. And an acute virtual tip 35 extending from the line 32.

The second V-shaped portion 40 is a portion that continues from the pair of hypotenuses 31 of the first V-shaped portion 30 at different angles, and has an obtuse rectangular inner contour line 41 and a flat outer contour line 42. The inner contour line 41 of the second V-shaped portion 40 includes a pair of inclined portions 41a connected to the inner contour line 32 of the pair of oblique sides 31, and a linear portion 41b that connects the tips of the pair of inclined portions 41a. The second V-shaped portion 40 has an obtuse virtual tip 43 (an example of the “obtuse tip” in the present invention) obtained by extending a pair of inclined portions 41a. The outer contour line 42 of the second V-shaped portion 40 includes a straight portion 42a formed in parallel with the straight portion 41b. The straight portion 42 a connects the tips of the outer contour lines 33 of the pair of hypotenuses 31.

Furthermore, the second V-shaped portion 40 has a seal width r4 that is narrower than other portions at a position continuous with the first V-shaped portion 30 (hereinafter referred to as “continuous position P2”).

The dimensions of each part of the belt-like seal portion 18f and the steam vent seal portion 18e are illustrated. For example, the length L1 of the seal part that combines the steam release seal part 18e and the belt-like seal part 18f is set to 50 mm or more and 400 mm or less. In this case, the opening angle θ1 of the first V-shaped portion 30 is preferably 60 ° to 150 ° and the opening angle θ2 of the second V-shaped portion 40 is preferably 90 ° to 170 °. Further, the seal width r1 of the belt-shaped seal portion 18f is set to 5 mm or more in consideration of the length h of the flap 18 and a seal width r6 described later. The seal width r2 is preferably 10 mm or more and 20 mm or less. Further, the seal width r3 of the first V-shaped portion 30 is 2 mm or more and 5 mm or less, and the seal width r4 at the continuous position P2 is not a portion where force is directly applied to the formation of the steam port or opening, but it is the smallest reduction in design Thickness needs to be given, and 0.5 mm or more is suitable. Further, the seal width r5 of the second V-shaped portion 40 in the linear portion 41b is the same level as the seal width r3, and is preferably 2 mm or more and 5 mm or less. Further, it is preferable that the steam port tip height r6 is set smaller than the seal width r2.

The length L2 of the straight portion 41b of the inner contour line 41 of the second V-shaped portion 40 is preferably 1 mm or more and 6 mm or less. The length L3 of the outer contour line 42 (straight line part 42a) of the second V-shaped part 40 is set to be larger than the length L2 of the straight line part 41b. Further, the length L3 of the outer contour line 42 is set to 5 mm or more and 20 mm or less, while the general length L4 (see FIG. 6B) of the conventional linear portion 102b is about 3 mm. .

Next, the suitable seal strength of the steam release seal portion 18e will be described. The greater the length L3 of the outer contour line 42, the higher the vapor pressure required to peel (break) the vapor vent seal portion 18e. For this reason, it is necessary to set the heat seal strength in the steam release seal portion 18e to an appropriate size according to the length L3 of the outer contour line 42. In this embodiment, since the length L3 of the outer contour line 42 is set to be relatively long, the heat seal strength (conforming to JIS Z0238) in the steam release seal portion 18e is lower than usual (for example, 5 (N / 15 mm Width) to 40 (N / 15 mm width) or less), and the steam release seal portion 18e is smoothly peeled off by the steam pressure.

(Operation of packaging bag for microwave oven)
The effect | action of the packaging bag 10 for microwave ovens is demonstrated based on FIG.3 (c) and FIG. In the microwave packaging bag 10, when the moisture of the contents is heated in the microwave oven and the vapor pressure of the storage part 17 increases, the storage part 17 expands.

As a result, as shown in FIG. 3C, force is applied intensively to the straight portion 41 b of the inner contour line 41 in the second V-shaped portion 40. Peeling of the part 18e begins, and the second V-shaped part 40 peels from the inner contour line 41 toward the outer contour line. When the peeling at the steam release seal portion 18e exceeds the outer contour line 42, the steam is released, but further opens left and right from the vicinity of the continuous position P2 with the residual pressure. Then, the separation stops at a position where the balance with the internal pressure of the accommodating portion 17 is balanced while the seal width is rapidly widened. That is, in the steam vent seal part 18e, the first V-shaped part 30 is hardly peeled off (remains), functions as an auxiliary part for opening the steam port 51, and the second V-shaped part 40 is It is completely peeled off and functions as a part for forming the steam port 51. As a result, a steam port 51 having a wide opening according to the length L3 of the outer contour line 42 is obtained.

And as shown in FIG. 4, the vapor | steam which escaped from the accommodating part 17 through the steam port 51 is discharged | emitted from the inside of the flap 18 outside through the notch 18g and the unsealed part 23a.

(Effect of embodiment)
The effects of the embodiment described above will be described. According to the present embodiment, even when the boiling point of the contents is high and the vapor pressure is difficult to increase, the vapor vent seal portion 18e can be smoothly peeled off, and the vapor can be discharged well from the widely opened vapor port 51. A microwave packaging bag 10 can be provided.

(Other examples of packaging bags for microwave ovens)
Next, another example of the microwave packaging bag will be described with reference to FIG. In the above-described microwave packaging bag 10 (see FIG. 1), the flap 18 (see FIG. 1) formed by folding a part of the first film 11 into a palm shape is illustrated, but the configuration of the flap can be arbitrarily changed. It is.

For example, as shown in FIG. 5, in the microwave packaging bag 60, a plurality of (in this example, two)

films

61 and 62 constitute a front-side film corresponding to the first film 11 (see FIG. 1). The flaps 63 are formed by partially overlapping these two

films

61 and 62 and bonding them in a palm-like shape. Then, such a flap 63 is provided with a V-shaped steam vent seal portion 18e (see FIG. 3). In this case, the unsealed portion 23a (see FIG. 4) and the notch 18g (see FIG. 4) are not necessarily required, and steam from the steam port 51 (see FIG. 3) opens the two

films

61 and 62 in the flap 63. It can be discharged from the inside of the flap 63 to the outside through the end 65.

Even in the microwave packaging bag 60 configured as described above, similarly to the microwave packaging bag 10 (see FIG. 2) described above, even if the boiling point of the contents is high and the vapor pressure is difficult to increase, The steam release seal portion 18e can be smoothly peeled off, and the steam can be discharged well from the steam port 51 having a wide opening.

As mentioned above, although this invention was demonstrated using embodiment, it cannot be overemphasized that the technical scope of this invention is not limited to the range as described in the said embodiment. It will be apparent to those skilled in the art that various modifications or improvements can be added to the above embodiment. Further, it is apparent from the scope of the claims that the embodiments added with such changes or improvements can be included in the technical scope of the present invention.

DESCRIPTION OF SYMBOLS 10 Microwave packaging bag 11 1st film 12 2nd film 18 Flap 20 Main body 30 The 1st V-shaped part 31 The hypotenuse 32 The inside outline 33 of an oblique side The outer outline 35 of an oblique side Virtual tip part 40 2nd V-shaped part 41 Inner outline 41a Inclined part 41b Straight line part 42 Outer outline 42a Straight line part 43 Virtual tip part 51 Steam opening 60 Packaging bag 61 for microwave oven Film 62 Film 63 Flap P2 Continuous position L2 Length of the straight line part of the inner contour line L3 Length of outer contour line

Claims

A microwave packaging bag,
A main body formed in a bag shape by thermally welding peripheral portions of one or more films;
A flap that is provided across a width in the second direction of the main body at a position that is biased to the outside of the central portion in the first direction of the main body, and that is formed in a palm shape by a part of the one or more films,
The flap has a seal portion having a predetermined width therein,
The seal part includes a steam release seal part, and a belt-like seal part extending from the steam release seal part to both ends of the main body in the second direction,
The steam release seal portion is provided so as to protrude toward the central portion side of the main body, and a first V-shaped portion that is continuous from the band-shaped seal portion and has a tip portion cut away, and the first V-shape. A packaging bag for a microwave oven, which is formed into a deformed V-shape formed of a second V-shaped portion continuous at different angles from both oblique sides of the portion.
The microwave packaging bag according to claim 1, wherein the first V-shaped portion has an acute virtual tip portion, and the second V-shaped portion has an obtuse tip portion.
The second V-shaped portion has an obtuse rectangular flat inner contour line, and has a width narrower than other portions at a position continuous with the first V-shaped portion. The packaging bag for microwave ovens of 2.
The second V-shaped portion has a flat outer contour line parallel to the straight portion of the inner contour line;
The packaging bag for a microwave oven according to claim 3, wherein the outer contour line is formed longer than a straight portion of the inner contour line.