Packaging bag

Abstract

To provide a packaging bag which can easily deal with a liquid object stored inside.SOLUTION: A packaging bag is provided which is a packaging bag for a microwave oven in which a flexible film is formed in a bag shape, and on which a spout is mounted.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a packaging bag for a microwave oven.

Background Art

[0002] There is known a packaging bag filled with contents such as retort foods, which can be heated in a self-standing state using a microwave oven or the like. For example, since the packaging bag of Patent Document 1 has self-standing stability, it has an excellent display effect at the storefront.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] On the other hand, when the content is a liquid substance, it is necessary to transfer it to another container after opening, and at that time, there has been a problem that the content spills.

[0005] The present invention has been made in view of such circumstances, and an object of the present invention is to provide a packaging bag that can easily handle a liquid substance contained therein.

Means for Solving the Problems

[0006] According to the present invention, there is provided a packaging bag for a microwave oven in which a flexible film is formed into a bag shape and a spout is attached.

[0007] With such a configuration, the user can pour out the contents through the spout attached to the packaging bag, eliminating the risk of spilling when transferring to another container. Also, since the spout is attached to the packaging bag, it is possible to seal the bag with a part of the contents poured out. In this way, it becomes possible to easily handle the liquid substance contained inside.

[0008] Hereinafter, various embodiments of the present invention will be exemplified. The embodiments shown below can be combined with each other. Preferably, it includes a peripheral surface portion having a front surface portion and a back surface portion facing each other, and a steam vent seal portion for forming a steam flow path as the internal pressure rises is provided on the peripheral surface portion. Preferably, the steam vent seal portion is formed at a position spaced apart from the center in the left-right direction of the packaging bag in a plan view. Preferably, the steam vent seal portion is provided on the opposite side of the spout with respect to the center in the left-right direction of the packaging bag in a plan view. Preferably, the packaging bag is configured to be self-standing.

Brief Description of the Drawings

[0009]

Figure 1

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BEST MODE FOR CARRYING OUT THE INVENTION

[0010] Hereinafter, embodiments of the present invention will be described. Various characteristic matters shown in the following embodiments can be combined with each other. Also, an invention can be established independently for each characteristic matter.

[0011] 1. First Embodiment As shown in FIGS. 1 and 2, the packaging bag 1 in the embodiment of the present invention is a self-standing packaging bag for a microwave oven formed by forming a flexible film into a bag shape. The packaging bag 1 includes a bottom portion 2 and a peripheral portion 21 provided so as to rise from the bottom portion 2. The peripheral portion 21 includes a front portion 3 and a back portion 4 facing each other. The front portion 3 and the back portion 4 are welded to each other at their left and right end portions (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 way, the bottom portion 2, the front portion 3, and the back portion 4 are welded to each other, so that the film is formed into a bag shape.

[0012] In the present disclosure, the up, down, left, and right in FIG. 2 will be described as the up, down, left, and right of the packaging bag 1. Specifically, the bottom portion 2 side is the lower side, and the front portion 3 (and the back portion 4) side is the upper side. Also, the left and right when the front portion 3 is arranged in front are the left and right of the packaging bag 1. Further, the front portion 3 side is the front side, and the back portion 4 side is the rear side.

[0013] The front portion 3 includes a front lower portion 3a and a front upper portion 3b. The front lower portion 3a is welded to the bottom portion 2. The front lower portion 3a and the front upper portion 3b are welded to each other at a clasp portion 10 formed by overlapping the inner surfaces of the front lower portion 3a and the front upper portion 3b in a folded-back state.

[0014] FIG. 2 is a view showing the packaging bag 1 in a plan view. The plan view means viewing from a direction perpendicular to the front surface portion 3 of the packaging bag 1 in a state where the packaging bag 1 does not contain the contents.

[0015] On the side ends of the packaging bag 1, there is provided a side end welding portion 12 for welding the front surface portion 3 and the back surface portion 4. Thereby, the front surface portion 3 and the back surface portion 4 are fixed in the front-rear direction. Further, at the lower end of the packaging bag 1, there is provided a lower end welding portion 13 for welding the bottom surface portion 2, the front surface portion 3, and the bottom surface portion 2 and the back surface portion 4. Further, at the upper end of the packaging bag 1, there is provided an upper end welding portion 22 for welding the front surface portion 3 and the back surface portion 4.

[0016] The lower end welding portion 13 is a region below the center line E (see FIG. 3) of the bottom film 20a, and at the side end and the lower end of the packaging bag 1, the bottom surface portion 2 is welded to the front surface portion 3 and the bottom surface portion 2 is welded to the back surface portion 4.

[0017] On one side in the left-right direction of the upper end welding portion 22, a side end inclined portion 14 continuous from the upper end to the side end of the packaging bag 1 is formed. A spout (pouring opening) 25 is attached to the side end inclined portion 14. More specifically, the spout 25 includes a pouring outlet 25a and a base portion 25b, and the front surface portion 3 and the back surface portion 4 are welded so as to sandwich the base portion 25b.

[0018] A steam vent sealing portion 11 is formed on the packaging bag 1. The steam vent sealing portion 11 is provided on the clasp portion 10. The steam vent sealing portion 11 is a welded portion having a lower welding strength than other welded portions. In the steam vent sealing portion 11, when the internal pressure in the packaging bag 1 rises due to the steam generated inside by heating the packaging bag 1, a steam flow path is formed accordingly. The steam in the packaging bag 1 is discharged to the outside from the steam vent sealing portion 11.

[0019] The steam vent sealing portion 11 is formed at a position spaced apart from the center in the left-right direction of the packaging bag 1 in a plan view. More preferably, the steam vent sealing portion 11 is provided on the side opposite to the spout 25 with respect to the center in the left-right direction of the packaging bag 1 in the left-right direction of the packaging bag 1. By doing so, when pouring out the contents from the spout 25, it is possible to prevent the contents from leaking out from the steam vent sealing portion 11.

[0020] The length H1 in the up-down direction of the packaging bag 1 is preferably 10 to 17 cm. More specifically, it is any one of the values 10, 11, 12, 13, 14, 15, 16, 17 (unit: cm), and may also be within the range between any two of the values exemplified here. For example, it can be 14 cm.

[0021] The length H2 from the upper end of the packaging bag 1 to the lowermost end of the base portion 25b of the spout 25 is desirably H2 / H1 ≧ 0.15 with respect to the length H1 in the up-down direction of the packaging bag 1. Preferably, it is desirably 0.3 ≧ H2 / H1 ≧ 0.15. More specifically, the value of H2 / H1 is any one of the values 0.15, 0.20, 0.25, 0.30, and may also be within the range between any two of the values exemplified here.

[0022] The length L1 in the left-right direction of the packaging bag 1 is preferably 8 to 15 cm. More specifically, it is any one of the values 8, 9, 10, 11, 12, 13, 14, 15 (unit: cm), and may also be within the range between any two of the values exemplified here. For example, it can be 10 cm.

[0023] The length L2 from the most central-side end in the left-right direction of the base portion 25b of the spout 25 to the nearer end of the packaging bag 1 is desirably L2 / L1 ≧ 0.15 with respect to the length L1 in the left-right direction of the packaging bag 1. Preferably, it is desirably 0.3 ≧ H2 / H1 ≧ 0.15. More specifically, the value of L2 / L1 is any one of the values 0.15, 0.20, 0.25, 0.30, and may also be within the range between any two of the values exemplified here.

[0024] It is desirable that the length L3 from the center of the steam venting seal portion 11 to the end closer to the packaging bag 1 is such that L3 / L1 ≤ 0.2 with respect to the length L1 of the packaging bag 1 in the left - right direction. Preferably, it is desirable that 0.1 ≤ L3 / L1 ≤ 0.2. More specifically, the value of L3 / L1 is any one of the values 0.10, 0.15, 0.20, and may also be within the range between any two of the numerical values exemplified here.

[0025] As shown in FIGS. 3 to 5, the packaging bag 1 is manufactured by inserting a bottom film 20a bent in a V - shape at the center line E between the front portion 3 and the back portion 4. Here, the length H3 from the center line E of the bottom film 20a to the lower end is preferably 3 to 6 cm. More specifically, it is any one of the values 3, 3.5, 4, 4.5, 5, 5.5, 6 (unit: cm), and may also be within the range between any two of the numerical values exemplified here. For example, it can be 4.5 cm. Notches R are formed at both ends of the bottom film 20a.

[0026] The length r1 from the center line E of the bottom film 20a to the center of the notch R is preferably 1 to 3 cm. More specifically, it is any one of the values 1, 1.5, 2, 2.5, 3 (unit: cm), and may also be within the range between any two of the numerical values exemplified here. For example, it can be 2.5 cm.

[0027] The diameter of the notch R is preferably 1 to 4 cm. More specifically, it is any one of the values 1, 1.5, 2, 2.5, 3, 3.5, 4 (unit: cm), and may also be within the range between any two of the numerical values exemplified here. For example, it can be 2 cm.

[0028] Hereinafter, with reference to FIGS. 4 to 5, the manufacturing procedure of the packaging bag 1 will be briefly described.

[0029] First, as shown in FIG. 4A, the inner surfaces of the ends of a single peripheral wall film 20b are overlapped to form an overlapping portion 10a. Then, as shown in FIG. 4B, the overlapping portion 10a is welded to form a clasping portion 10, and an elliptical ring C is formed in the remaining portion.

[0030] Subsequently, as shown in FIGS. 4A to 4B, one end C1 of the ring C is cut, and the bottom film 20a bent in a V shape is inserted. Subsequently, as shown in FIGS. 4B to 5, the bottom film 20a and the peripheral wall film 20b are welded, and the other end C2 of the ring C is cut off to form the bottom surface portion 2, the front surface portion 3, and the back surface portion 4. Thereafter, a side end inclined portion 14 is formed by cutting a part of the upper side of the front surface portion 3 and the back surface portion 4, and the spout 25 is inserted and welded to manufacture the packaging bag 1.

[0031] The bottom film 20a and the peripheral wall film 20b are preferably laminated films having a base material layer and a sealant layer, and more preferably have an adhesive layer and a printing layer between the base material layer and the sealant layer.

[0032] The base material layer is arranged to be exposed on the outer surface of the packaging bag 1, and the sealant layer is arranged to be exposed on the inner surface of the packaging bag 1. The sealant layers are welded (heat-sealed) to form a welded portion.

[0033] The base material layer is formed of a material having excellent strength and high impact resistance. As the base material layer, for example, polyamide, polyolefin, polyethylene, polyester, etc. are used. More specifically, a stretched polyethylene terephthalate film, a silica-deposited stretched polyethylene terephthalate film, an alumina-deposited stretched polyethylene terephthalate film, a stretched nylon film, a stretched polypropylene film, or a polypropylene / ethylene-vinyl alcohol copolymer coextruded film can be used. As the film constituting the base material layer, a film having linear cutability in the MD direction (the direction in which the film flows during manufacturing) is preferable.

[0034] The subsequent layer is a layer for adhering the base material layer and the sealant layer to each other in a laminated manner. As the adhesion method, for example, an extrusion lamination using polyethylene or the like as the adhesive layer may be used, or a dry lamination using a polyvinyl acetate-based adhesive, a polyacrylate-based adhesive, a cyanoacrylate-based adhesive, an ethylene copolymer-based adhesive, a cellulose-based adhesive, a polyester-based adhesive, a polyamide-based adhesive, an amino resin-based adhesive, an epoxy-based adhesive, a polyurethane-based adhesive, or the like as the adhesive may also be used.

[0035] The sealant layer can be formed of a resin having excellent weldability. As the sealant layer, for example, it can be formed of a polyolefin-based resin such as polyethylene, polypropylene, ethylene-vinyl acetate copolymer, ethylene-propylene block copolymer, and more specifically, unstretched polypropylene or linear low-density polyethylene can be used. As the film constituting the sealant layer, those having linear cutability in the MD direction are preferable.

[0036] An intermediate layer may be provided between the base material layer and the sealant layer. As the intermediate layer, films such as polyethylene terephthalate, polyamide, polyethylene, polypropylene and other polyolefins, polyvinyl chloride, polycarbonate, polyvinyl alcohol, ethylene-propylene copolymer, saponified ethylene-vinyl acetate copolymer, or films coated with polyvinylidene chloride on these, or films subjected to vapor deposition of inorganic substances such as silicon oxide and aluminum oxide, or films such as polyvinylidene chloride can be used.

[0037] Incidentally, the bottom film 20a preferably has a tensile elastic modulus that decreases as the temperature rises. In this case, when the packaging bag 1 is heated, the film softens and the lower end of the central portion of the packaging bag 1 easily opens in the front-rear direction. Here, let the tensile elastic moduli in the TD direction (corresponding to the front-rear direction of the packaging bag 1) of the film constituting the bottom surface portion 2 at 23.5°C and 100°C be M1 and M2, respectively. The tensile elastic modulus can be obtained by performing a tensile test in accordance with JIS K 7127. The test speed of the tensile test is 50 mm / min, and the dumbbell shape for the test is No. 5 shape.

[0038] M1 is preferably 600 to 1400 MPa, and more preferably 800 to 1200 MPa. Specifically, M1 is, for example, 600, 700, 800, 900, 1000, 1100, 1200, 1300, 1400 MPa, and may be within the range between any two of the values exemplified here.

[0039] 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, 600 MPa, and may be within the range between any two of the values exemplified here.

[0040] 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, 4, and may be within the range between any two of the values exemplified here.

[0041] The peripheral wall film 20b may have the same physical properties as the bottom film 20a, or may have different physical properties. Also, the sealant layer of the bottom film 20a and the peripheral wall film 20b is preferably formed of the same resin, and it is preferable that the sealant layer is formed thicker than the base material layer. More specifically, the ratio D1 / D2 of the thickness D1 of the sealant layer to the thickness D2 of the base material layer is preferably 1 ≦ D1 / D2 ≦ 2. That is, the ratio D1 / D2 is any value of 1.0, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9, 2.0, or may be within the range between any two of the values exemplified here. By making the sealant layer of the bottom film 20a thicker than the base material layer in this way, the self-standing stability is improved.

[0042] 2. Second Embodiment The second embodiment of the present invention will be described with reference to FIG. 6. In this embodiment, the clasping portion 10 provided with the steam vent seal portion 11 is different from the above-described embodiment in that it is provided at a position corresponding to the side end inclined portion 14 in the vertical direction. Hereinafter, the differences will be mainly described.

[0043] In the packaging bag 1 of this embodiment, as shown in FIG. 6, the clasping portion 10 provided with the steam vent seal portion 11 is provided at a position corresponding to the side end inclined portion 14 (more specifically, a position corresponding to the base portion 25b of the spout 25) in the vertical direction. By adopting such a form, the steam vent seal portion 11 can be provided at the upper part of the packaging bag 1, and not only can more contents be accommodated in the packaging bag 1, but also the effect that it is less likely to leak from the steam vent seal portion 11 when pouring out the contents can be obtained. Even in such a form, the present invention can obtain the same effects as the above-described embodiment.

[0044] 3. Third Embodiment The third embodiment of the present invention will be described with reference to FIGS. 7 and 8. In this embodiment, a gripping portion 24 for the user to grip the packaging bag 1 is provided at one of the left and right ends of the packaging bag 1, which is different from the above-described embodiment. Hereinafter, the differences will be mainly described.

[0045] In the packaging bag 1 of this embodiment, as shown in FIGS. 7 and 8, a gripping portion 24 is provided outside the side-end welding portion 12 on the side opposite to the spout 25 in the left-right direction. The gripping portion 24 includes a front gripping portion 24a and a back gripping portion 24b. As shown in FIG. 8, the front gripping portion 24a and the back gripping portion 24b are welded to each other at the upper end and the side ends, and are welded to the bottom surface portion 2 at the lower end.

[0046] The gripping portion 24 can be rolled to the front side or the back side of the packaging bag 1. By gripping the rolled gripping portion 24, it is possible to easily grip the packaging bag 1 even immediately after heating. Note that the rolled gripping portion 24 may be fixed to the front surface portion 3 or the back surface portion 4 with a tape or the like. Even in such a form, the present invention can obtain the same effects as those of the above embodiment.

[0047] 4. Fourth Embodiment The fourth embodiment of the present invention will be described with reference to FIG. 9. In this embodiment, the packaging bag 1 is different from the above embodiment in that it is a so-called gusset (with a flange) type having side surface portions 5 between the front surface portion 3 and the back surface portion 4. Hereinafter, the description will focus on the differences.

[0048] In the packaging bag 1 of this embodiment, as shown in FIG. 9, a substantially rectangular peripheral surface portion 21 is formed by welding the front surface portion 3 and the back surface portion 4 to a pair of side surface portions 5, respectively. The spout 25 is attached to the center in the left-right direction of the upper-end welding portion 22. Here, it is preferable to provide the steam vent sealing portion 11 at a position separated from the center in the left-right direction. Even in such a form, the present invention can obtain the same effects as those of the above embodiment.

[0049] 5. Other Embodiments Although the embodiments have been described above, the technical idea in the present disclosure can also be adopted in the following aspects. ·In the above-described embodiment, the fixing portion 15 is constituted by a semicircular notch R formed in the bottom surface portion 2, but it is not limited to this form. For example, the opposing surfaces of the bottom film may be adhered using an adhesive, or the front portion 3 and the back portion 4 may be fixed in the front-rear direction by a locking means such as a stapler. ·In the above-described embodiment, the bottom surface portion 2 is constituted by a film bent in a V shape, but it is not limited to this form, and for example, it may be constituted by a film bent in a W shape. ·The packaging bag 1 may or may not include a steam vent sealing portion 11. In that case, for example, the upper end of the bag (preferably, the side opposite to the spout 25 in the left-right direction) may be opened slightly to discharge the steam generated during heating. ·The packaging bag 1 may not include the clasp portion 10. ·The steam vent sealing portion 11 may be provided at a portion other than the clasp portion 10. ·The manufacturing method of the packaging bag 1 is not limited to the method described in the above embodiment. ·The form of the packaging bag 1 is not limited to the above embodiment. For example, it may be a flat bag shape that is not self-standing and needs to lie horizontally during heating. However, in the case of a self-standing packaging bag as in the above embodiment, it is possible to place it as it is after pouring out a part of the contents, and it becomes possible to handle it more simply.

Explanation of reference numerals

[0050] 1: Packaging bag 2: Bottom surface portion 3: Front portion 3a: Lower front portion 3b: Upper front portion 4: Back portion 5: Side surface portion 10: Clasp portion 10a: Joining portion 11: Steam vent sealing portion 12: Side end welding portion 13: Lower end welding portion 14: Side end inclined portion 15: Fixing portion 20a: Bottom film 20b: Peripheral wall film 21: Peripheral surface part 22: Upper end welding part 24: Holding part 24a: Front holding part 24b: Rear holding part 25: Spout 25a: Pouring outlet 25b: Base part

Claims

1. A packaging bag for a microwave oven, in which a flexible film is formed into a bag shape, comprising a peripheral surface portion having a front surface portion and a back surface portion facing each other, a side end inclined portion is formed that extends from the upper end to the side end of the packaging bag, a spout is attached to the side end inclined portion, the front surface portion includes a lower front surface and an upper front surface, the lower front surface and the upper front surface are welded together in a state where they are folded back on each other at a clasp portion formed by overlapping the inner surfaces of the lower front surface and the upper front surface, a steam vent seal portion that forms a steam flow path as the internal pressure rises is provided in the clasp portion, the steam vent seal portion is provided on the side opposite to the spout with respect to the center in the left - right direction of the packaging bag in a plan view of the packaging bag.

2. A packaging bag for a microwave oven, in which a flexible film is formed into a bag shape, comprising a peripheral surface portion having a front surface portion and a back surface portion facing each other, a side end inclined portion is formed that extends from the upper end to the side end of the packaging bag, a spout is attached to the side end inclined portion, the front surface portion includes a lower front surface and an upper front surface, the lower front surface and the upper front surface are welded together in a state where they are folded back on each other at a clasp portion formed by overlapping the inner surfaces of the lower front surface and the upper front surface, a steam vent seal portion that forms a steam flow path as the internal pressure rises is provided in the clasp portion, the packaging bag includes a side end welded portion where the front surface portion and the back surface portion are welded at the side end of the portion that accommodates the content poured out through the spout, a gripping portion for a user to grip the packaging bag is provided outside the side end welded portion on the side opposite to the spout in the left - right direction of the packaging bag.

3. The packaging bag according to claim 1 or claim 2, which is configured to be self - standing.

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