Packaging bags

Abstract

To provide a packaging bag for an electronic oven that can easily receive a content within the packaging bag and allows for easily eating the content after heating.SOLUTION: There is provided according to the present invention a self-supporting packaging bag for an electronic oven formed of a flexible film in a bag shape. The packaging bag comprises a bottom-face portion and a peripheral-face portion provided in a manner rising from the bottom-face portion. The peripheral-face portion comprises front and rear face portions that are opposite to each other and an opening that is open upward, and the peripheral-face portion comprises an open-close member configured to open and close the opening and an unsealing portion for opening the packaging bag. The unsealing portion is provided at a position closer to the bottom-face portion than the open-close member. A container-like main body portion obtained by tearing the peripheral-face portion in a circumferential direction in the unsealing portion and removing a cut-away portion upper than the unsealing portion, is utilized as a tableware for use in eating the content within the packaging bag.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a self-supporting packaging bag for use in a microwave oven, which is made by forming a flexible film into a bag shape. [Background technology]

[0002] Patent Document 1 discloses a packaging bag for use in a microwave oven that has an openable and closable joint. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2016-137929 A Summary of the Invention [Problem to be solved by the invention]

[0004] In the packaging bag of Patent Document 1, any content can be heated by opening the joint and placing the content to be heated in the packaging bag. In the configuration of Patent Document 1, it is assumed that after the content is heated, it is transferred to a dish through the opening formed by opening the joint and eaten.

[0005] However, with such a configuration, when transferring the contents to the dish, the contents may get caught on the bite portion, making it difficult to transfer the contents.

[0006] The present invention has been made in consideration of the above circumstances, and provides a packaging bag for use in a microwave oven, which allows contents to be easily stored inside the packaging bag and enables the contents to be easily eaten after heating. [Means for solving the problem]

[0007] According to the present invention, there is provided a self-supporting packaging bag for a microwave oven in which a flexible film is formed into a bag shape, the packaging bag having a bottom portion and a peripheral portion extending upward from the bottom portion, the peripheral portion having a front portion and a back portion facing each other and an opening portion that opens upward, the peripheral portion having an opening / closing member configured to open and close the opening, and an opening portion for opening the packaging bag, the opening portion being located closer to the bottom portion than the opening / closing member, and a container-shaped main body portion obtained by tearing the peripheral portion circumferentially at the opening portion and removing the cut-out portion above the opening portion is used as tableware for eating the contents of the packaging bag.

[0008] The packaging bag of the present invention is configured to be openable and closable by an opening and closing member, so that contents can be easily placed inside the packaging bag. In addition, after the placed contents are heated, the container-shaped main body obtained by slitting the peripheral surface in the circumferential direction at the opening portion and removing the cut-out portion above the opening portion is configured to be used as tableware. Since the opening and closing member is provided at the cut-out portion, it is removed when opening. Therefore, the opening and closing member does not get in the way when eating the contents, so that the contents can be easily eaten.

[0009] The packaging bag of the present invention can close the top of the packaging bag after the contents are placed in the packaging bag without using a heat sealing device. Therefore, the packaging bag can be suitably used in a take-out format in which, for example, restaurants and the like place food in the packaging bag, close the opening and closing member, and sell the food.

[0010] Various embodiments of the present invention will be described below. The embodiments described below can be combined with each other. Preferably, in the packaging bag described above, the bottom portion, the front portion, and the back portion are welded together to form the bag shape. Preferably, the packaging bag described above is configured so that the central lower end, which is the lower end of the central portion in the left-right direction of the packaging bag, opens more in the front-to-back direction than the side lower ends, which are the lower ends of the side portions in the left-right direction of the packaging bag. Preferably, in the packaging bag described above, the opening and closing member has a front side engaging member and a rear side engaging member that are engageable with each other, the front side engaging member is fixed to the inner surface side of the front portion, and the rear side engaging member is fixed to the inner surface side of the rear portion. Preferably, the packaging bag described above has a first protrusion protruding upward at the upper end of the front portion, and a second protrusion protruding upward at the upper end of the back portion. Preferably, in the packaging bag described above, the front portion has a lower front portion and an upper front portion, the lower front portion is welded to the bottom portion, and the lower front portion and the upper front portion are welded to a seam portion formed by folding the lower front portion and overlapping the upper front portion. Preferably, in the packaging bag described above, the joining portion has a third protrusion that protrudes from the upper end of the front surface portion when folded down toward the upper end of the front surface portion. Preferably, in the packaging bag described above, the peripheral surface portion is provided with a steam release seal portion that forms a steam flow path as the internal pressure increases. Preferably, in the packaging bag described above, the opening portion is provided at a position closer to the bottom portion than the steam release seal portion. Preferably, in the packaging bag described above, the opening portion is provided with a tear initiation portion that serves as a starting point for tearing the peripheral portion. [Brief description of the drawings]

[0011] [Figure 1] Fig. 1A is a perspective view of a packaging bag 1 according to a first embodiment of the present invention in which contents are stored, and Fig. 1B is a perspective view of the packaging bag 1 in an opened state. [Diagram 2] FIG. 2 is a plan view of the packaging bag 1 of FIG. [Diagram 3] 3A is a cross-sectional view taken along line AA in FIG. 2, FIG. 3B is an enlarged view of region B in FIG. 3A, and FIG. 3C shows a state in which the opening / closing member 23 in FIG. 3B is open. [Figure 4] 2 is a perspective view of a bottom film 20a constituting the bottom portion 2. FIG. [Diagram 5] Fig. 5A is a side view of the peripheral wall film 20b, and Fig. 5B is a diagram showing a state in which a part of the peripheral wall film 20b has been cut and the bottom film 20a has been inserted into the cut portion. [Figure 6] FIG. 6A is a diagram showing how the peripheral wall film 20b and the bottom film 20a are welded together to produce the packaging bag 1, and FIG. 6B is a diagram showing the state in which the opening / closing member 23 has been inserted between the front portion 3 and the back portion 4. [Figure 7] Fig. 7A is an enlarged view of the bottom part 2 in a state where the lower end of the central part of the packaging bag 1 is widely opened in the front-rear direction. Fig. 7B is a detailed view of the vicinity of the lower end of the packaging bag 1 in Fig. 2. [Figure 8] FIG. 8A is a perspective view of a packaging bag 1 according to a second embodiment of the present invention, and FIG. 8B shows a state in which the opening 22 of the packaging bag 1 in FIG. 8A is open. [Figure 9] FIG. 11 is a perspective view of a packaging bag 1 according to a third embodiment of the present invention. [Figure 10] FIG. 10A is a perspective view of a packaging bag 1 according to a fourth embodiment of the present invention, and FIG. 10B shows a state in which the opening 22 of the packaging bag 1 in FIG. 10A is open. [Figure 11] FIG. 11 is a perspective view of a packaging bag 1 according to a fifth embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] Hereinafter, embodiments of the present invention will be described. Various features shown in the following embodiments can be combined with each other. Also, each feature can be an invention independently.

[0013] 1. First embodiment 1-1. Composition of packaging bag 1 As shown in Figs. 1 to 3, a packaging bag 1 in an embodiment of the present invention is a self-supporting packaging bag for use in a microwave oven, in which a flexible film is formed into a bag shape. The packaging bag 1 has a bottom portion 2 and a peripheral portion 21 provided to rise from the bottom portion 2. The peripheral portion 21 has a front portion 3 and a back portion 4 opposed to each other, and has an opening 22 that opens upward. The front portion 3 and the back portion 4 are welded to each other at their left and right ends (hereinafter also referred to as side ends). The bottom portion 2 is welded (heat sealed) to the front portion 3 and the back portion 4. In this manner, the bottom portion 2, the front portion 3, and the back portion 4 are welded to each other, forming a bag shape from the film.

[0014] In this disclosure, the top, bottom, left and right of Fig. 2 will be described as the top, bottom, left and right of the packaging bag 1. Specifically, the bottom portion 2 side will be the lower side, and the front portion 3 (and rear portion 4) side will be the upper side. Also, the left and right sides when the front portion 3 is placed in front will be the left and right sides of the packaging bag 1. Furthermore, the front portion 3 side will be the front side, and the rear portion 4 side will be the rear side.

[0015] The front surface portion 3 includes a lower front surface portion 3a and an upper front surface portion 3b. The lower front surface portion 3a is welded to the bottom surface portion 2. As shown in Fig. 3, the lower front surface portion 3a and the upper front surface portion 3b are folded back on each other and welded to each other at a joint portion 10 formed by overlapping the inner surfaces of the lower front surface portion 3a and the upper front surface portion 3b.

[0016] As shown in FIGS. 1 to 3, an opening / closing member 23 and an opening portion 24 are provided on a peripheral surface 21 of the packaging bag 1.

[0017] As shown in Fig. 3, the opening / closing member 23 is configured to be able to open and close the opening 22. The opening / closing member 23 includes a front side engaging member 23a and a rear side engaging member 23b which are engageable with each other. The front side engaging member 23a is fixed to the inner surface of the front portion 3. The rear side engaging member 23b is fixed to the inner surface of the rear portion 4. The engaging members 23a and 23b are preferably fixed by welding to the front portion 3 and the rear portion 4, respectively.

[0018] As shown in FIG. 3C, the front side engaging member 23a has a base 23a1 and a hook portion 23a2 protruding from the base 23a1. The rear side engaging member 23b has a base 23b1 and a hook portion 23b2 protruding from the base 23b1. The bases 23a1 and 23b1 are fixed to the front part 3 and the rear part 4, respectively. The hook portions 23a2 and 23b2 can be engaged and disengaged with each other. As shown in FIG. 3B, the hook portions 23a2 and 23b2 are engaged with each other to close the opening 22, and as shown in FIG. 3C, the hook portions 23a2 and 23b2 are disengaged from each other to open the opening 22.

[0019] The entire surface of the base 23a1 may be welded to the front surface portion 3, but it is preferable that a part of the lower side of the base 23a1 is provided with an unwelded portion that is not welded to the front surface portion 3. In this case, when the packaging bag 1 is heated and the internal pressure of the packaging bag 1 increases and the packaging bag 1 expands, a force in the direction of opening the opening / closing member 23 is not easily applied to the opening / closing member 23, and steam leakage from the opening / closing member 23 is suppressed. The unwelded portion is preferably provided so as to extend from the lower end of the base 23a1 to the upper end of the hook portion 23a2. In other words, it is preferable that the base 23a1 is welded to the front surface portion 3 only at a portion above the hook portion 23a2. The unwelded portion may be provided on the base 23b1 instead of the base 23a1, or may be provided on both the bases 23a1 and 23b1.

[0020] The tearing portion 24 is a portion for opening the packaging bag 1, and in this embodiment, the tearing portion 24 includes a tearing initiation portion 24a which is a starting point for tearing the peripheral portion 21, and a cut line 24b on which a line indicating a portion for cutting the opening portion is printed. The packaging bag 1 may be opened by tearing the peripheral portion 21 starting from the tearing initiation portion 24a, or by cutting the peripheral portion 21 along the cut line 24b using a cutting tool such as scissors. The tearing initiation portion 24a is a portion that makes it easy to tear the peripheral portion 21, and is formed by, for example, a notch or a cut. One of the tearing initiation portion 24a and the cut line 24b can be omitted. The tearing portion 24 may also have another configuration that enables the packaging bag 1 to be opened. For example, instead of the cut line 24b, a half-cut line extending in the circumferential direction of the peripheral portion 21 may be provided, or a strip-shaped film may be arranged so as to extend in the circumferential direction of the peripheral portion 21. The strip of film is welded to the peripheral surface portion 21, and by gripping and pulling an end of the strip of film, it is possible to tear the peripheral surface portion 21 along the strip of film.

[0021] The packaging bag 1 has an upper cutout portion 5 and a lower main body portion 6 in the vertical direction, with the opening portion 24 as the boundary. The container-shaped main body portion 6 is obtained by circumferentially tearing the peripheral surface portion 21 at the opening portion 24 and removing the cutout portion 5 above the opening portion 24. As shown in FIG. 1B, the main body portion 6 has an opening 7. The main body portion 6 is used as a dish to be used when eating the contents in the packaging bag 1.

[0022] The opening / closing portion 24 is provided at a position closer to the bottom portion 2 than the opening / closing member 23. In other words, the opening / closing member 23 is provided at the cutout portion 5. Therefore, when the cutout portion 5 is removed during opening, the opening / closing member 23 is also removed. Therefore, the opening / closing member 23 does not get in the way when eating the contents.

[0023] The opening portion 24 is provided at a position closer to the bottom portion 2 than the joining portion 10. In other words, the joining portion 10 is provided at the cutout portion 5. Therefore, when the cutout portion 5 is removed during opening, the joining portion 10 is also removed. Therefore, the joining portion 10 does not get in the way when eating the contents.

[0024] Fig. 2 is a plan view of the packaging bag 1. The plan view means that the packaging bag 1 is flattened without any contents inside the packaging bag 1 and viewed in a direction perpendicular to the front surface 3 of the packaging bag 1. As shown in Fig. 2, the packaging bag 1 is formed so as to be line-symmetrical with respect to a center line in the left-right direction.

[0025] The packaging bag 1 is formed with a steam release seal portion 11. The steam release seal portion 11 is provided at the joint portion 10. The steam release seal portion 11 is a welded portion having a lower weld strength than other welded portions. When the internal pressure of the packaging bag 1 increases due to steam generated inside the packaging bag 1 by heating the packaging bag 1, a steam flow path is formed in the steam release seal portion 11. The steam inside the packaging bag 1 is discharged to the outside through the steam release seal portion 11.

[0026] The vertical length H1 of the cutout portion 5 can be, for example, 6 to 10 cm. The vertical length H2 of the main body portion 6 can be, for example, 6 to 14 cm, preferably 12 cm or less, more preferably 10 cm or less. If it is larger than this, it becomes difficult to take out the contents. Specifically, H1 is, for example, 6, 6.5, 7, 7.5, 8, 8.5, 9, 9.5, or 10 cm, and may be within a range between any two of the numerical values ​​exemplified here. Specifically, H2 is, for example, 6, 7, 8, 9, 10, 11, 12, 13, or 14 cm, and may be within a range between any two of the numerical values ​​exemplified here.

[0027] Furthermore, the length H2 is preferably longer than the length H3 from the center line E to the lower end of the bottom film 20a, and more preferably 2 cm or more longer than H3. The value of (H2-H3) is, for example, 2 to 8 cm, specifically, for example, 2, 3, 4, 5, 6, 7, or 8 cm, and may be within a range between any two of the values ​​exemplified here. If the value of (H2-H3) is less than 2 cm, the height of the peripheral wall when the packaging bag 1 is opened becomes low, limiting the amount of the contents.

[0028] The packaging bag 1 has side end welds 12 at its side edges, which weld the front portion 3 and the back portion 4 together. This fixes the front portion 3 and the back portion 4 together in the front-to-rear direction. Furthermore, the packaging bag 1 has a bottom end weld 13 at its bottom edge, which welds the bottom portion 2 to the front portion 3, and the bottom portion 2 to the back portion 4 together.

[0029] The lower end welded portion 13 is the area below the center line E, and welds the bottom portion 2 to the front portion 3, and the bottom portion 2 to the back portion 4 at the side ends and lower ends of the packaging bag 1 (the areas surrounded by dotted lines in Figure 2).

[0030] As shown in Figs. 4 to 6, the packaging bag 1 is manufactured by inserting the bottom film 20a, which is folded into a V-shape at the center line E, between the front part 3 and the back part 4. Here, the length H3 from the center line E to the bottom end of the bottom film 20a is preferably 3 to 6 cm, more specifically, any one of 3, 3.5, 4, 4.5, 5, 5.5, and 6 (unit: cm), and may be within a range between any two of the numerical values ​​exemplified here, for example, 4.5 cm. As described above, the main body part 6 is preferably about this size because it is also used as tableware. A notch R is formed on both ends of the bottom film 20a.

[0031] The length r1 from the center line E of the bottom film 20a to the lower end of the cutout R is preferably 1 to 3 cm, and more specifically, is any of the values ​​of 1, 1.5, 2, 2.5, or 3 (unit: cm), and may also be within a range between any two of the values ​​exemplified here, for example, 2.5 cm.

[0032] The diameter of the cutout R is preferably 1 to 4 cm, and more specifically, is any of the values ​​of 1, 1.5, 2, 2.5, 3, 3.5, or 4 (unit: cm), and may be within a range between any two of the numerical values ​​exemplified here, for example, 2 cm.

[0033] Hereinafter, a manufacturing procedure for the packaging bag 1 will be briefly described with reference to FIGS.

[0034] First, as shown in FIG. 5A, the inner faces of the ends of one peripheral wall film 20b are overlapped to form overlapping portion 10a, and as shown in FIG. 5B, overlapping portion 10a is welded to form palm-shaped portion 10, and the remaining portion forms an elliptical ring C.

[0035] 5A to 5B, one end C1 of the ring C is cut, and the bottom film 20a folded into a V shape is inserted. Then, as shown in Figs. 5B to 6A, the bottom film 20a and the peripheral wall film 20b are welded together, and the other end C2 of the ring C is cut off, thereby forming the bottom portion 2, the front portion 3, and the back portion 4.

[0036] Next, as shown in FIG. 6B, an opening / closing member 23 is inserted between the front portion 3 and the back portion 4 near the other end C2 of the ring C (near the upper ends of the front portion 3 and the back portion 4), and the opening / closing member 23 is welded to the inner surfaces of the front portion 3 and the back portion 4, thereby producing the packaging bag 1.

[0037] Here, the bottom film 20a and the peripheral wall film 20b are preferably laminated films having a base layer and a sealant layer, and more preferably have an adhesive layer and a printed layer between the base layer and the sealant layer.

[0038] The base layer is disposed so as to be exposed on the outer surface of the packaging bag 1, and the sealant layer is disposed so as to be exposed on the inner surface of the packaging bag 1. The sealant layers are welded (heat sealed) to each other to form a welded portion.

[0039] The substrate layer is formed of a material having excellent strength and high impact resistance. For example, polyamide, polyolefin, polyethylene, polyester, etc. can be used as the substrate layer. More specifically, stretched polyethylene terephthalate film, silica-deposited stretched polyethylene terephthalate film, alumina-deposited stretched polyethylene terephthalate film, stretched nylon film, stretched polypropylene film, polypropylene / ethylene-vinyl alcohol copolymer co-extruded co-stretched film, etc. can be used. As the film constituting the substrate layer, one having linear cutability in the MD direction (direction in which the film flows during production) is preferable. The substrate layer, which is the outermost layer, may contain an antibacterial or antiviral agent (such as silver ions). In particular, by kneading a bleed-out antibacterial or antiviral agent into the substrate layer, the antibacterial or antiviral treatment of the surface of the substrate layer progresses when it is heated in a microwave oven and reaches a high temperature, and it is hygienic to remove it from the microwave oven.

[0040] The adhesive layer is a layer for bonding the base layer and the sealant layer to each other so as to be laminated together. The bonding method may be, for example, extrusion lamination using polyethylene or the like as an adhesive layer, or dry lamination using a polyvinyl acetate adhesive, a polyacrylic acid ester adhesive, a cyanoacrylate adhesive, an ethylene copolymer adhesive, a cellulose adhesive, a polyester adhesive, a polyamide adhesive, an amino resin adhesive, an epoxy adhesive, a polyurethane adhesive, or the like as an adhesive.

[0041] The sealant layer can be formed of a resin having excellent weldability. The sealant layer can be formed of a polyolefin resin such as polyethylene, polypropylene, ethylene-vinyl acetate copolymer, or ethylene-propylene block copolymer, and more specifically, non-oriented polypropylene or linear low-density polyethylene can be used. The film constituting the sealant layer is preferably one having linear cutability in the MD direction.

[0042] The sealant layer, which is the innermost surface of the packaging bag 1, may be subjected to an easy-slide treatment. The easy-slide treatment is a treatment for increasing the slideability, and can be performed by mixing or applying a lubricant to the sealant layer, or by performing a water- and oil-repellent treatment on the innermost surface of the packaging bag 1. This improves the slideability of the contents attached to the inner surface of the packaging bag 1. The easy-slide treatment is preferably performed near the opening portion 24 and the cut-out portion 5. In this case, if the packaging bag 1 is heated in a tilted state, the contents may move to the opening portion 24 or the cut-out portion 5, and in that case, there is a risk of hands or scissors getting dirty when the packaging bag 1 is opened. However, in the packaging bag 1 that has been subjected to the easy-slide treatment, the contents fall to the bottom when the packaging bag 1 is stood upright, so that hands and scissors are prevented from getting dirty when the packaging bag 1 is opened. The easy-slide treatment may be performed when the film is produced, or when the bag is made.

[0043] As an example, in this embodiment, the structure is as follows: base layer: stretched nylon (25 μm) / printing layer / adhesive layer (dry laminate) / sealant layer: LLDPE (60 μm). An intermediate layer may be provided between the base layer and the sealant layer. As the intermediate layer, films of polyethylene terephthalate, polyamide, polyethylene, polypropylene or other polyolefins, polyvinyl chloride, polycarbonate, polyvinyl alcohol, ethylene-propylene copolymers, saponified ethylene-vinyl acetate copolymers, or the like, or films of these coated with polyvinylidene chloride, films of inorganic substances such as silicon oxide and aluminum oxide vapor-deposited thereon, or films of polyvinylidene chloride, or the like, can be used.

[0044] As shown in Fig. 7A, the packaging bag 1 is configured such that at the lower end of the central portion in the left - right direction (hereinafter also referred to as the lower end of the central portion), it opens wider in the front - rear direction than the lower end of the side portion in the left - right direction (hereinafter also referred to as the lower end of the side portion). This is because at the notch R formed in the bottom film 20a (see Fig. 4), the front surface portion 3 and the back surface portion 4 are directly welded, and a fixing portion 15 for fixing the front surface portion 3 and the back surface portion 4 in the front - rear direction is formed. Note that when the lower end of the central portion opens in the front - rear direction, the center line E of the bottom surface 2 is pulled downward of the packaging bag 1.

[0045] As shown in Fig. 7B, the lower - end welding portion 13 includes a pair of gradient portions 13a and a central portion 13b. The gradient portion 13a is a portion welded with a gradient (diagonally) from the side end of the packaging bag 1 toward the lower end of the central portion. By providing the gradient portion 13a in this way, the distance from the center line E to the lower - end welding portion 13 gradually increases as it goes from the side end toward the central portion in the left - right direction (W1 < W2). With such a configuration, it is possible to prevent pinholes from occurring at the lower end of the side portion.

[0046] The central portion 13b is provided between the pair of gradient portions 13a and is formed linearly. By providing the central portion 13b linearly, it becomes easier to use the main body portion 6 as a tableware.

[0047] An air pocket 14 is provided outside the gradient portion 13a. The air pocket 14 is formed in a triangular shape and is a space where air that could not be completely discharged to the outside during welding in the lower - end welding portion 13 remains. By providing the air pocket 14, the residual air in the lower - end welding portion 13 gathers in the air pocket 14, and the welding strength is improved.

[0048] The length L1 in the left-right direction at the bottom end of the packaging bag 1 is preferably 15 to 25 cm, and more preferably 18 cm or more. More specifically, it is any value of 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, or 25 (unit: cm), and may be within a range between any two of the numerical values ​​exemplified here, for example, 20 cm. If it is made too much larger than 25 cm, it may not fit on the turntable of a microwave oven. However, this is not the case if the packaging bag is a flat type intended for use in a microwave oven.

[0049] The length L2 of the gradient portion 13a in the left-right direction is preferably 3 to 6 cm, more specifically, any one of 3, 3.5, 4, 4.5, 5, 5.5, and 6 (unit: cm), and may be within a range between any two of the values ​​exemplified here, for example, 4 cm. If it is made smaller than this, it becomes difficult to completely open the lower end of the central portion in the front-rear direction.

[0050] The length L3 of the central portion 13b in the left-right direction is preferably 5 to 15 cm, and more preferably 8 cm or more. More specifically, it may be any of the values ​​of 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, and 15 (unit: cm), and may be within a range between any two of the values ​​exemplified here, for example, 10 cm. By setting the value of L3 in this way, when the bottom portion 2 expands in the front-back direction, the distance between the front portion 3 and the back portion 4 in the front-back direction increases, and the opening 7 can be enlarged.

[0051] The length L4 in the left-right direction on the inside of the packaging bag 1 is preferably 10 to 23 cm, and more specifically, any of the values ​​10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, or 23 (unit: cm), and may be within a range between any two of the numerical values ​​exemplified here, for example, 18 cm.

[0052] The length W2 from the center line E to the upper end of the central portion 13b is preferably 3 to 6 cm, more specifically, any one of 3, 3.5, 4, 4.5, 5, 5.5, and 6 (unit: cm), and may be within a range between any two of the numerical values ​​exemplified here, for example, 4 cm. It is more preferable that the length W2 is the same as the length L2 of the gradient portion 13a in the left-right direction. It is preferable that the length L3 in the left-right direction of the central portion 13b is 2≦L3 / W2≦3 with respect to the length W2 from the center line E to the upper end of the central portion 13b, and more specifically, that the length L3 is any one of 2.0, 2.2, 2.4, 2.6, 2.8, and 3.0, or within a range between any two of the numerical values ​​exemplified here. In this way, when the bottom surface portion 2 is expanded in the front-rear direction, the bottom surface that contacts the placement surface can be made wider. Furthermore, the length W2 from the center line E to the upper end of the central portion 13b is preferably 0.5≦W2 / L2≦1.7 with respect to the length L2 of the gradient portion 13a in the left-right direction, and more specifically, it is preferably any of the values ​​of 0.5, 0.6, 0.7, 0.8, 0.9, 1.0, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, and 1.7, or within a range between any two of the values ​​exemplified here. More preferably, it is 0.8≦W2 / L2≦1.2, and even more preferably, it is 0.9≦W2 / L2≦1.1. If W2 / L2 is small, the front portion 3 and the back portion 4 tend to be close to each other at the opening 7 when opening, which reduces the convenience of using it as tableware. On the other hand, if W2 / L2 is large, when the bottom portion 2 is opened in the front-back direction, a fold is generated inside the gradient portion 13a, which makes it difficult to take out the contents.

[0053] The height H4 from the center line E to the upper end of the fixing part 15 is preferably H4 / H3≧0.2 with respect to the length H3 from the center line E to the lower end. Preferably, 0.5≧H4 / H3≧0.2 is preferable, and more specifically, the value of H4 / H3 may be any of 0.20, 0.25, 0.30, 0.35, 0.40, 0.45, and 0.50, or may be within a range between any two of the values ​​exemplified here. In this way, by ensuring the height H4 from the center line E to the fixing part 15, it is possible to reliably keep the opening 7 open in the front-rear direction.

[0054] The angle θ of the inclined portion 13a with respect to the upper end of the central portion 13b is preferably 30 degrees to 60 degrees, more specifically, any of 30, 35, 40, 45, 50, 55, 60 (unit: degree), and may be within a range between any two of the numerical values ​​exemplified here, and more preferably, 45 degrees. In this way, by making the angle θ of the inclined portion 13a larger than 30 degrees, the width Wn in the front-rear direction between the neighboring regions N2 of the side ends of the packaging bag 1 can be secured, and the bottom surface of the packaging bag 1 can be secured large, improving the self-supporting stability of the packaging bag 1 (see FIG. 7A). At the same time, the opening portion 9 can be opened widely in the front-rear direction, improving the convenience when used as tableware.

[0055] The bottom film 20a preferably has a tensile modulus that decreases with increasing temperature. In this case, when the packaging bag 1 is heated, the film softens and the lower end of the central part of the packaging bag 1 is likely to open in the front-rear direction. Here, the tensile moduli in the TD direction (corresponding to the front-rear direction of the packaging bag 1) of the film constituting the bottom part 2 at 23.5°C and 100°C are defined as M1 and M2, respectively. The tensile modulus can be determined by conducting a tensile test in accordance with JIS K 7127. The tensile test speed is 50 mm / min, and the dumbbell shape used for the test is No. 5.

[0056] M1 is preferably 600 to 1400 MPa, more preferably 800 to 1200 MPa. Specifically, M1 is, for example, 600, 700, 800, 900, 1000, 1100, 1200, 1300, or 1400 MPa, and may be within a range between any two of the numerical values ​​exemplified here.

[0057] M2 is preferably 200 to 600 MPa, and more preferably 300 to 500 MPa. Specifically, M2 is, for example, 200, 250, 300, 350, 400, 450, 500, 550, or 600 MPa, and may be within a range between any two of the numerical values ​​exemplified here.

[0058] The value of M1 / M2 is, for example, 1.2 to 4, and preferably 1.5 to 3. Specifically, this value is, for example, 1.2, 1.5, 2, 2.5, 3, 3.5, or 4, and may be within a range between any two of the numerical values ​​exemplified here.

[0059] The peripheral wall film 20b may have the same physical properties as the bottom film 20a, or may have different physical properties.

[0060] 2. Second embodiment A second embodiment of the present invention will be described with reference to Fig. 8. This embodiment is similar to the first embodiment, and the main difference lies in the structure in the vicinity of the opening 22 of the packaging bag 1. The following description will focus on the differences.

[0061] In this embodiment, as shown in Fig. 8A, a first protrusion 3p protruding upward is provided at the upper end of the front surface 3, and a second protrusion 4p protruding upward is provided at the upper end of the back surface 4. When filling the packaging bag 1 with contents, as shown in Fig. 8B, the protrusions 3p, 4p can be spread outward to easily maintain the opening 22 in a spread state, making it easy to fill the contents. In addition, the protrusions 3p, 4p can be provided with openings 3q, 4q that form handles, and after filling the packaging bag 1 with contents, the packaging bag 1 can be easily carried by inserting fingers into the openings 3q, 4q.

[0062] 3. Third embodiment A second embodiment of the present invention will be described with reference to Fig. 9. This embodiment is similar to the first embodiment, and the main difference lies in the structure in the vicinity of the opening 22 of the packaging bag 1. The following description will focus on the differences.

[0063] In the first embodiment, the front portion 3 and the back portion 4 were welded to the upper end of the packaging bag 1 at the side edge welded portion 12, but in this embodiment, as shown in Fig. 9, the distance from the opening / closing member 23 to the upper end of the packaging bag 1 is longer than in the first embodiment, and an unwelded portion 12a where the front portion 3 and the back portion 4 are not welded to each other is provided near the upper end of the packaging bag 1. Therefore, when filling the packaging bag 1 with contents, the front portion 3 and the back portion 4 are folded back at the unwelded portion 12a, making it easier to maintain the opening 22 of the packaging bag 1 in an expanded state.

[0064] This embodiment is preferable since it requires fewer steps to process the front portion 3 and the back portion 4 compared to the second embodiment.

[0065] In addition, in the area between the opening / closing member 23 and the upper end of the packaging bag 1, openings 3q, 4q that form handles may be provided in the front portion 3 and the back portion 4, making it easy to carry the packaging bag 1 after filling it with the contents by inserting fingers into the openings 3q, 4q.

[0066] 4. Fourth embodiment A fourth embodiment of the present invention will be described with reference to Fig. 10. This embodiment is similar to the first embodiment, and the main difference lies in the structure in the vicinity of the opening 22 of the packaging bag 1. The following description will focus on the differences.

[0067] In this embodiment, as shown in Fig. 10A, the joint portion 10 is provided with a protruding portion 10p that protrudes from the upper end of the front surface portion 3 when the joint portion 10 is folded down toward the upper end of the front surface portion 3. When filling the packaging bag 1 with contents, as shown in Fig. 10B, the protruding portion 10p can be spread outward to easily maintain the opening 22 in an expanded state, making it easy to fill the packaging bag 1 with contents. In addition, the protruding portion 10p can be provided with an opening 10q that forms a handle, and after filling the packaging bag 1 with contents, the packaging bag 1 can be easily carried by inserting a finger into the opening 10q.

[0068] 5. Fifth embodiment A fifth embodiment of the present invention will be described with reference to Fig. 11. This embodiment is similar to the third embodiment, and the following description will focus on the differences.

[0069] In this embodiment, the length L5 from the upper end of the opening / closing member 23 to the upper end of the side end welded portion 12 is longer than in the third embodiment. The length L5 is, for example, 1 to 8 cm, and preferably 2 to 6 cm. Specifically, the length L5 is, for example, 1, 2, 3, 4, 5, 6, 7, or 8 cm, and may be within a range between any two of the numerical values ​​exemplified here. The upper end of the side end welded portion 12 is at approximately the same height as the openings 3q and 4q.

[0070] Since the length L5 is long, a container-shaped utensil accommodating section 29 is formed in the area surrounded by the opening / closing member 23 and the pair of side end welded sections 12. Utensils (chopsticks, spoon, fork, etc.) 25 used when eating the contents in the packaging bag 1 can be accommodated in the utensil accommodating section 29. In FIG. 11, the utensils 25 are relatively short, so the entire utensils 25 are accommodated in the utensil accommodating section 29. However, if the utensils 25 are too long to fit in the utensil accommodating section 29, only a part of the utensils 25 may be accommodated in the utensil accommodating section 29.

[0071] A tear-opening portion 26 may be provided at a position above the opening / closing member 23. The configuration of the tear-opening portion 26 is the same as that of the tear-opening portion 24. The packaging bag 1 of this embodiment has a large overall height, and if left as is, there is a risk that it will interfere with the upper surface of a home microwave oven. Therefore, it is preferable to tear the packaging bag 1 at the tear-opening portion 26 and remove the portion above the tear-opening portion 26 before heating the contents in the packaging bag 1 in a microwave oven. It is preferable to provide the tear-opening portion 26 at a position where the side end welded portion 12 is located. In this case, the packaging bag 1 is easy to tear. In addition, it is preferable to arrange the tear-opening portion 26 at a position adjacent to the opening / closing member 23. In this case, the overall height of the packaging bag 1 after removing the portion above the tear-opening portion 26 can be reduced. As with the first embodiment, after the contents are heated in a microwave oven, the packaging bag 1 is opened at the tear-opening portion 24, and the portion below the tear-opening portion 24 can be used as tableware to eat the contents in the packaging bag 1.

[0072] A transparent portion 27 is provided on the front portion 3, and the contents can be seen through the transparent portion 27. The transparent portion 27 is provided at a position corresponding to the upper surface of the dish design 28, which makes the contents look as if they are being served on the dish, stimulating the consumer's appetite. In addition, it is preferable that the area between the transparent portion 27 and the bottom end welded portion 13 is opaque. If the contents contain liquid, the liquid is likely to collect at the bottom of the packaging bag 1, and the collected liquid does not look aesthetically pleasing. For this reason, by making the area between the transparent portion 27 and the bottom end welded portion 13 opaque, the collected liquid becomes less visible, improving the aesthetic appearance. The length L6 from the upper end of the lower end welded portion 13 to the lower end of the transparent portion 27 is, for example, 1 to 15 cm, preferably 2 to 10 cm, and more specifically, for example, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, or 15 cm, and may be within a range between any two of the numerical values ​​exemplified here.

[0073] 6. Other embodiments Although the embodiments have been described above, the technical ideas of the present disclosure can also be adopted in the following aspects. The peripheral portion 21 may have a pair of side surfaces between the front portion 3 and the rear portion 4. In this case, the front portion 3 and the rear portion 4 are welded to the pair of side surfaces, respectively, to form the peripheral portion 21 having a substantially rectangular shape. In the above embodiment, the fixing portion 15 is configured as a semicircular notch R formed in the bottom portion 2, but is not limited to this form. For example, the opposing surfaces of the bottom film may be bonded together using an adhesive, or the front portion 3 and the rear portion 4 may be fixed in the front-rear direction by a fastening means such as a stapler. In the above embodiment, the bottom portion 2 is made of a film folded into a V shape, but this is not limited to this form and may be made of a film folded into a W shape, for example. The packaging bag 1 does not need to have a steam release seal portion 11. In that case, for example, the bag can be opened slightly to release steam generated during heating. The packaging bag 1 does not have to have the seam portion 10. The steam release seal portion 11 may be provided in a portion other than the joint portion 10. The method for producing the packaging bag 1 is not limited to the method described in the above embodiment. The opening that serves as the handle may be formed by punching the film, or by making a C-shaped cut in the film. [Explanation of symbols]

[0074] 1: Packaging bag 2: Bottom part 3: Front part 3a: lower front 3b: Upper front 3p: 1st protrusion 3q: opening 4: Back part 4p: 2nd protrusion 4q: Opening 5: Cut-out section 6: Main body 7:Aperture 10: Gassho part 10a: overlapping part 10p:Protrusion 10q: opening 11: Steam release seal 12: Side end welding part 12a: Unwelded area 13: Lower end welding part 13a: Gradient section 13b: Central part 14: Air pocket 15: Fixed part 20a: Bottom film 20b: Peripheral wall film 21: Peripheral part 22: Opening 23: Opening and closing parts 23a: Front side engagement member 23a1: Base 23a2: Hook part 23b: Rear side engagement member 23b1 : Base 23b2: Hook section 24: Opening section 24a:Tear start part 24b: Cutting line 25: Tools 26: Opening section 27:Transparent part 28: Design 29: Tool storage section B :Area C: ring C1: One end C2: Other end E:Central Line N2: Neighborhood area R: Notch θ: angle

Claims

1. A self-supporting microwave packaging bag in which a flexible film is formed into a bag shape, The packaging bag includes a bottom surface portion and a peripheral surface portion provided so as to rise from the bottom surface portion, The peripheral surface portion has a front surface portion and a rear surface portion opposed to each other, and has an opening portion opening upward, The peripheral surface portion is provided with an opening / closing member configured to be able to open and close the opening, and an opening portion for opening the packaging bag, The opening portion is provided at a position closer to the bottom portion than the opening / closing member, A container-shaped main body portion obtained by tearing the peripheral surface portion in the circumferential direction at the opening portion and removing the cut-out portion above the opening portion is used as a tableware for eating the contents in the packaging bag, A first protrusion protruding upward is provided at an upper end of the front surface, A second protruding portion protruding upward is provided at an upper end of the rear surface portion, When the content is filled and after the content is filled, the first protruding portion and the second protruding portion are not welded to each other, The packaging bag is configured to be closed by the opening and closing member without welding the upper side of the packaging bag after the contents are contained.

2. A self-supporting microwave packaging bag in which a flexible film is formed into a bag shape, The packaging bag includes a bottom surface portion and a peripheral surface portion provided so as to rise from the bottom surface portion, The peripheral surface portion has a front surface portion and a rear surface portion opposed to each other, and has an opening portion opening upward, the front portion and the rear portion are welded together at side edge welds, The peripheral surface portion is provided with an opening / closing member configured to be able to open and close the opening, and an opening portion for opening the packaging bag, The opening portion is provided at a position closer to the bottom portion than the opening / closing member, A container-shaped main body portion obtained by tearing the peripheral surface portion in the circumferential direction at the opening portion and removing the cut-out portion above the opening portion is used as a tableware for eating the contents in the packaging bag, When filling the contents and after filling the contents, an unwelded portion where the side end welded portion is not provided is provided near the upper end of the side end of the front portion and the back portion, The packaging bag is configured to be closed by the opening and closing member without welding the upper side of the packaging bag after the contents are contained.

3. The packaging bag according to claim 2, A packaging bag in which a utensil storage section for storing utensils used when eating the contents in the packaging bag is formed in the area surrounded by the opening / closing member and the side end welded portion and between the upper end of the packaging bag and the opening / closing member.

4. The packaging bag according to any one of claims 1 to 3, The bottom portion, the front portion, and the back portion are welded together to form the bag shape.

5. The packaging bag according to claim 4, The packaging bag is configured so that a central lower end, which is the lower end of the central portion in the left-right direction of the packaging bag, opens more in the front-to-back direction than a side lower end, which is the lower end of a side portion in the left-right direction of the packaging bag.

6. The packaging bag according to any one of claims 1 to 5, The opening / closing member includes a front engaging member and a rear engaging member that are engageable with each other, The front engaging member is fixed to the inner surface side of the front portion, The rear engaging member is fixed to an inner surface side of the rear portion.

7. The packaging bag according to any one of claims 1 to 6, The packaging bag has a steam release seal portion on the peripheral surface portion that forms a steam flow path as the internal pressure increases.

8. The packaging bag according to claim 7, The opening portion is provided at a position closer to the bottom portion than the steam release seal portion.

9. The packaging bag according to any one of claims 1 to 8, The opening portion of the packaging bag has a tear initiation portion that serves as a starting point for tearing the peripheral portion.

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