Packaging bag

Abstract

To provide a packaging bag which can store confectionery in a bulk state, in which an unsealed packaging bag can be used as a container, and which is easy to clean, after removal of stored contents.SOLUTION: In a packaging bag, surfaces of a heat-fusible resin layer of a laminated film comprising the heat-fusible resin layer on an innermost layer are disposed in a manner of being opposed to each other. The packaging bag comprises an upper joining part and a lower joining part vertically, and comprises side joining parts horizontally. A seal-open starting notch is provided in at least one of the side joining parts. A first cutting line for opening-induction having an opened shape converging on the center side of the packaging bag near the center side of the packaging bag than the notch, a second cutting line which traverses the packaging bag from a tip where the first cutting line converges, and a third cutting line which does not intersect one or more first cutting lines are provided on both upper and lower sides of the second cutting line. Further, a cutting line for extension which intersects the second cutting line and the third cutting line is provided on the center side of the packing bag of a both side-joining part.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a packaging bag for accommodating snack foods, appetizers, sweet chestnuts, etc. in a loose state. Specifically, it relates to a packaging bag that can be used as a container as it is after being opened, is easy to clean after taking out the contents, and has excellent disposability.

Background Art

[0002] Conventionally, snack foods, appetizers, sweet chestnuts, etc. are often accommodated and packaged in a loose state in various forms of packaging bags. And, for the convenience of users, for example, in the case of a four-sided sealed bag, an easy-open heat-sealed bag is known that is provided with continuous or discontinuous cutting lines along the opening planned line so that the packaging bag can be easily torn and opened by hand. (See, for example, Patent Document 1).

[0003] However, when taking out the contents from the packaging bag, there is a problem that oils, seasonings, etc. adhering to the inner surface of the packaging bag adhere to the back of the hand and the palm, making it sticky, soiling the hand, and impairing the sense of cleanliness. Especially when a large number of people gather and eat in a party format, it is unhygienic, and it is necessary to prepare a container such as a plate and transfer the snack foods in the packaging bag to the container, which is troublesome.

[0004] In recent years, there are also local governments that will not collect used container packaging as recyclable waste unless it is washed and clean. When disposing of the packaging bag, instead of disposing of it as it is, there is an increasing awareness of washing away the dirt inside the packaging bag before disposing of it, and a packaging bag that is easy to wash even inside is desired when disposing of it.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] Therefore, the present invention has been made to solve the above problems, and its object is to provide a packaging bag that can accommodate confectionery and the like in a scattered state, the opened packaging bag can be used as a container as it is, and after taking out the contents, the inside can be easily washed.

Means for Solving the Problems

[0007] In order to achieve the above object, the present invention provides a packaging bag according to claim 1, wherein the heat-sealable resin layers of a laminated film having a heat-sealable resin layer on the innermost layer are arranged facing each other, and the packaging bag includes an upper joint portion and a lower joint portion arranged facing each other vertically, and side joint portions arranged facing each other horizontally. At least one of the side joint portions is provided with a notch for starting opening, and in the vicinity of the central side of the packaging bag closer to the central side than the notch, a first cut line for opening induction having an open shape converging toward the central side of the packaging bag is provided. A second cut line is provided so as to cross the packaging bag from the converged tip of the first cut line toward the central side of the packaging bag. One or more third cut lines that do not intersect with the first cut line are provided on both the upper and lower sides of the second cut line. Further, an expanding cut line that intersects with the second cut line and the third cut line is provided on the central side of the packaging bag of both the side joint portions.

[0008] Further, the present invention according to claim 2 is characterized in that, in the packaging bag according to claim 1, the expanding cut line extends along the side joint portion toward the lower joint portion.

[0009] Further, the present invention according to claim 3 is characterized in that, in the packaging bag according to claim 1 or claim 2, the heat-sealable resin layer is made of low-density polyethylene having a thickness of 60 μm or less.

Advantages of the Invention

[0010] The packaging bag of the present invention can accommodate confectionery and the like in a loose state, has excellent opening property, and the opened packaging bag can be used as a container as it is. After taking out the contents, when it is discarded, it can be easily washed and dried up to the inside of the packaging bag, so it can be discarded as recyclable resource waste.

Brief Explanation of Drawings

[0011]

Figure 1

Figure 2

Figure 3

Figure 4

Embodiments for Carrying Out the Invention

[0012] The above present invention will be described in detail below with reference to the drawings and the like. FIG. 1 is a front view showing the packaging bag according to the present invention, FIG. 2 is an explanatory view showing a configuration example of the laminated film of the packaging bag according to the present invention, FIG. 3 is an explanatory view showing the opened state and the expanded state of the packaging bag according to the present invention, and FIG. 4 is an explanatory view showing other patterns of the cut line for expansion. In the figures, P is the packaging bag, P' is the expanded packaging bag, S is the opening piece, 1 is the upper joining part, 2 is the lower joining part, 3 and 4 are the side joining parts, 5 is the notch, 6 is the first cut line, 7 is the second cut line, 8 is the third cut line, 9 is the cut line for expansion, 10 is the laminated film, 10' is the torn laminated film, 11 is the base material layer, 12 is the intermediate layer, 13 is the heat-sealing resin layer, 14 is the body material, and 15 is the bottom material, respectively.

[0013] FIG. 1 is a front view showing a packaging bag according to the present invention. The packaging bag P shown in FIG. 1 is a stand-up bag having a body material 14 and a bottom material 15. This packaging bag P has a laminated film 10 provided with a heat-sealable resin layer 13 (see FIG. 2) on the innermost layers of the front and back as the body material 14, and the surfaces of the heat-sealable resin layers 13 are arranged to face each other. The laminated film 10 is folded in half as the bottom material 15 so that the heat-sealable resin layer 13 is on the outside, and the folded part is placed upward and sandwiched between the lower parts of the front and back body materials 14. It is opposed to the heat-sealable resin layer 13 of the body material 14 and heat-sealed at a predetermined position to provide an upper joint part 1 and a lower joint part 2 arranged to face each other vertically, and side joint parts 3 and 4 arranged to face each other horizontally. The lower joint part 2 is formed by a curved boat-shaped seal. The upper joint part 1 is heat-sealed after filling the packaging bag P with the contents. It is open before filling, but for convenience, the upper joint part 1 is shown in FIG. 1.

[0014] The packaging bag P is provided with an opening start notch 5 in one side joint part 3 at a position slightly separated from the lower joint part 2 toward the lower side of the lower edge of the upper joint part 1. The notch 5 may be provided in at least one side joint part, and may be provided in both side joint parts 3 and 4. As the notch 5, a V-notch, a U-notch, an I-notch, etc. can be used.

[0015] The first score line 6 for opening induction is provided on the two laminated films 10 of the front and back in a shape that opens at a position near the center side of the packaging bag P rather than the notch 5 and converges toward the center side of the packaging bag P. And a second score line 7 is provided on the two laminated films 10 of the front and back so as to cross the packaging bag P from the converged tip of the first score line 6 provided on the laminated films 10 of the front and back toward the center side of the packaging bag P. Further, third score lines 8 that do not cross each of the first score lines 6 are provided on both the upper and lower sides of the second score line 7. The third score line 8 is provided in parallel with the second score line 7. When the notch 5 is also formed in the side joint portion 4, the first score line 6 for opening induction may be provided on the two laminated films 10 of the front and back so as to converge toward the center side of the packaging bag P as described above. The first score line 6 for opening induction in an open shape is preferably V-shaped or U-shaped. The second score line 7 and the third score line 8 are preferably provided linearly. The third score line 8 is for assisting such that when the tearing of the laminated films 10 of the front and back proceeds along the second score line 7 during opening, and when the tearing direction deviates from the second score line 7, the tearing direction is corrected by the third score line 8 and the tearing proceeds along the third score line 8. Incidentally, the first score line 6, the second score line 7, and the third score line 8 are preferably formed by aligning the front and back positions on the two laminated films 10 of the front and back.

[0016] Furthermore, an expanding score line 9 that intersects the second score line 7 and the third score line 8 is provided on the center side of each of the packaging bags P at both side joint portions 3 and 4. It is important that the expanding score line 9 is provided so as to intersect the second score line 7 and the third score line 8. As will be described later, when the laminated film 10 is torn and expanded, the tearing becomes easier. Also, the expanding score line 9 may be provided only on either the front or back laminated film 10. Of course, it can also be provided on both the front and back. The position where the expanding score line 9 is provided preferably has a gap large enough for a finger to fit between the inner edges of the side joint portion 3 and the side joint portion 4 and the expanding score line 9, and is preferably provided in a range about 10 mm to 30 mm away from the inner edges of the side joint portion 3 and the side joint portion 4 toward the center side of the packaging bag P.

[0017] As shown in Fig. 2, for example, the laminated film 10 constituting the packaging bag P preferably has a structure in which a base material layer 11, an intermediate layer 12, and a heat-sealable resin layer 13 are laminated. Further, depending on the performance and quality required for the packaging bag P, it can be simplified to two layers of the base material layer 11 and the heat-sealable resin layer 13, or the intermediate layer 12 and the heat-sealable resin layer 13. Alternatively, the base material layer 11 or the intermediate layer 12, or both the base material layer 11 and the intermediate layer 12 can be made into a multi-layer structure with multiple layers.

[0018] As the base material layer 11 constituting the laminated film 10, since it is the basic material constituting the packaging bag P, a synthetic resin film having excellent properties in terms of mechanical, physical, chemical, etc. can be used. Films such as polypropylene, polyethylene terephthalate, nylon, polyacrylonitrile, polyvinylidene chloride, polyvinyl alcohol, ethylene-vinyl alcohol copolymer, etc., or biaxially stretched films such as polylactic acid-based films whose starting materials are plant-derived can be used. Alternatively, a film obtained by applying a barrier resin composition such as polyvinylidene chloride or polyvinyl alcohol to the above film to provide a barrier layer, or a film obtained by depositing inorganic substances such as aluminum, aluminum oxide, silicon oxide, indium oxide, tin oxide, zirconium oxide, etc. to provide a vapor deposition layer can be used. Further, as these films, usually, the base material layer 11 is often printed, and since printability is required, a film stretched in one axis direction or biaxially is preferable. Also, the thickness of the film constituting the base material layer 11 may be the minimum thickness that can be maintained for the strength, rigidity, etc. as the basic material, and can be determined considering costs, etc., but usually, it is about 9 to 50 μm.

[0019] The intermediate layer 12 is provided when rigidity, light shielding property, gas barrier property, etc. are required depending on the packaging conditions, transportation conditions, and protection function conditions of the contents. Films used for the aforementioned base material layer 11, films provided with the aforementioned barrier layer or vapor deposition layer, metal foils such as aluminum, iron, copper, tin, etc. can be used. Also, a laminate of one or more combinations of these films, etc. may be used. The thickness of the intermediate layer 12 is about 6 to 50 μm.

[0020] The heat-sealing resin layer 13 is preferably a layer formed from a heat-adhesive resin that can be melted by heat and fused to each other, and may be appropriately selected and used according to the required quality for the packaging bag. However, it can be formed using resins such as low-density polyethylene, medium-density polyethylene, high-density polyethylene, linear (linear) low-density polyethylene, polypropylene, ethylene-α-olefin copolymer, ethylene-propylene copolymer, ethylene-vinyl acetate copolymer, ionomer, ethylene-acrylic acid copolymer, ethylene-methacrylic acid copolymer, ethylene-acrylic acid ester copolymer, ethylene-methacrylic acid ester copolymer, etc. In particular, when tearing the laminated film 10 from the tear line 9 for expansion, considering the tearability, as the heat-sealing resin layer 13, low-density polyethylene with a thickness of 60 μm or less is preferred.

[0021] As a method for laminating the base material layer 11, the intermediate layer 12, and the heat-sealing resin layer 13, for example, a dry lamination method using an adhesive for dry lamination such as a urethane-based adhesive or an extrusion lamination method in which a polyethylene resin or the like is heat-melted and extruded for lamination can be used.

[0022] Next, a specific configuration example of the laminated film 10 will be shown. (1) PET / Printing / DLM / ONY / DLM / ALM / DLM / LDPE (2) PET / Printing / DLM / PET / DLM / ALM / DLM / LDPE (3) PET / Printing / DLM / ALM / DLM / LDPE (4) PET / Printing / DLM / LDPE (5) PET / Printing / DLM / ONY / DLM / LDPE (6) PET / Printing / DLM / VMPET / DLM / LDPE Note that the abbreviations indicate the following materials, and the underlined parts indicate examples of the layers with tear lines. PET: Biaxially oriented polyethylene terephthalate DLM: Adhesive for dry lamination ONY: Biaxially oriented nylon ALM: Aluminum foil LDPE: Low density polyethylene VMPET: Vacuum metallized biaxially oriented polyethylene terephthalate

[0023] The cuts forming the first cut line 6, the second cut line 7, the third cut line 8, and the expansion cut line 9 are formed in the base material layer 11 and the intermediate layer 12 and do not penetrate into the heat-sealing resin layer 13, which is a so-called half cut. However, when aluminum foil is used in the intermediate layer 12, it does not penetrate into the aluminum foil. Also, in the case of a two-layer configuration, the cut is made only in the base material layer 11 or the intermediate layer 12. Specifically, in the configuration examples (1) to (6) of the laminated film 10, the cut is made in the layer marked with an underline at a predetermined position. It is preferable to form the cut in the laminated film 10 by using, for example, a carbon dioxide laser, irradiating the surface of the base material layer 11 with laser light, melting it to a predetermined layer, and engraving it in a substantially V shape. The type and wavelength of the laser light are appropriately selected according to the types of resins of the base material layer 11 and the intermediate layer 12 where the cut is to be made.

[0024] The line width of the first cut line 6, the second cut line 7, the third cut line 8, and the expansion cut line 9 is preferably 0.1 mm or more and 0.3 mm or less. Also, in the present invention, it is important to enable the user to surely visually recognize the formation position of the expansion cut line 9, and it is preferable to provide a display by printing on this part.

[0025] The interval between the second cut line 7 and the third cut line 8 may be 0.8 mm or more, and it is preferable to form them in the front and back laminated films 10 with the front and back positions aligned.

[0026] Next, a method for opening the packaging bag P of the present invention will be described with reference to FIGS. 1 and 3. To open the packaging bag P in FIG. 1, first, pinch the notch 5, pick up the end of the packaging bag P with both fingers, and pull in opposite directions. Then, tearing starts from the notch 5, progresses along the first tear line 6, is guided by the first tear line 6 to reach the second tear line 7, and further progresses along the second tear line 7 to be opened. The opening piece S can be removed and the bag can be opened. Also, when the tearing direction deviates from the second tear line 7, the tear reaches one of the third tear lines 8 on the outside. When the tear progresses along this third tear line 8 and reaches the other end, the opening piece S can be removed and the bag can be opened.

[0027] Then, pinch the expansion cut line 9 at the opening, pick up the front laminated film 10 on the side of the side joint 3 (the front side in FIG. 3) with one finger, pick up one laminated film 10 on the side where the expansion cut line 9 is provided (the front side in FIG. 3) with the other finger, and pull in opposite directions. Then, only the front laminated film 10 is torn from the expansion cut line 9. Similarly, perform the same operation on the expansion cut line 9 on the side of the side joint 4 to tear only one laminated film 10 from the expansion cut line 9. After that, change hands, pick up the front laminated film 10 where the tear has started from the expansion cut line 9 with one finger, pick up the back laminated film 10 with the other finger, and tear the front laminated film 10 downward to expand the torn laminated film 10', thereby expanding the packaging bag. FIG. 3(A) shows the state with the opening piece S removed, and FIG. 3(B) shows the state of the packaging bag P' with the front laminated film 10 torn and expanded from the expansion cut line 9. The contents are exposed in the expanded packaging bag P', and since there is no need to insert a finger into the packaging bag P, the contents can be easily picked up without soiling the back of the hand or the palm in particular. Thus, the packaging bag P of the present invention can accommodate confectionery and the like in a loose state, has excellent opening properties, and the opened packaging bag can be used as a container as it is, providing convenience to the user.

[0028] After taking out the contents, the expanded packaging bag P' can be easily washed, and since it is further expanded, it dries quickly and can be discarded as recyclable resource waste.

[0029] FIG. 4 is an explanatory diagram showing other patterns of the tear line for expansion. In the example of the tear line 9 for expansion shown in FIG. 4(A), the tear line 9 for expansion extends linearly up to the vicinity of the base material 15 along the side joint 3 and the side joint 4. Therefore, when the opened packaging bag is expanded, the front laminated film 10 is torn straight, so that an aesthetic appearance can be obtained.

[0030] FIG. 4(B) shows a U-shaped curve in which the tear line 9 for expansion bulges toward the lower joint 2. One end intersects the second tear line 7 and the third tear line 8 inside the side joint 3, and the other end intersects the second tear line 7 and the third tear line 8 inside the side joint 4. When the opened packaging bag P is expanded, the laminated film 10 on the front side can be torn along the tear line 9 for expansion and torn into a tongue shape. When the tongue-shaped opening piece is removed, a U-shaped take-out opening is formed. And it can be used as it is as a container. By providing the shape of the tear line 9 for expansion in a U shape, a take-out opening with excellent aesthetic appearance can be obtained. Also, after use, the expanded packaging bag P' may be washed and discarded from the take-out opening.

[0031] Note that the embodiments described so far are representative examples of the packaging bag according to the present invention, and the packaging bag according to the present invention is not limited thereto, and all those within the scope not departing from the gist of the present invention are included in the present invention.

[0032] The packaging bag of the present invention has been shown by an example applied to a stand-up bag as shown in FIG. 1, but is not limited thereto, and can also be applied to, for example, a three-side seal type packaging bag, a four-side seal type packaging bag, etc.

Example

[0033] 〔Example 1〕 A biaxially oriented polyethylene terephthalate film (PET) with a thickness of 12 μm was used for the base material layer 11, and gravure printing was performed on one side. An aluminum foil (ALM) with a thickness of 7 μm was used for the intermediate layer 12, and a low-density polyethylene film (LDPE) with a thickness of 60 μm was used for the heat-sealable resin layer 13. These films were laminated using a dry lamination method with a dry lamination adhesive (DLM) to produce a laminated film 10 of [PET 12 μm / printing / DLM / ALM 7 μm / DLM / LDPE 60 μm]. The produced laminated film 10 was used as the front film, back film, and base material, and a standing pouch was produced using a standing pouch bag-making machine. Side joints 3, 4, and a lower joint 2 were provided, notches 5 were made, and a self-supporting bag with an open top was produced. Then, the self-supporting bag was irradiated with laser light from the base material layer side using a pulse oscillation type carbon dioxide laser, and a first cut line 6, a second cut line 7, a third cut line 8, and an expansion cut line 9, each consisting of a substantially V-shaped cut, were formed at predetermined positions on the base material layer to produce a packaging bag P before the upper joint 1 shown in FIG. 1 was formed. Overall dimensions (vertical): 180 mm Overall dimensions (horizontal): 140 mm Bottom material folding: 40 mm Side joint seal width: 8 mm Lower joint: A boat-shaped seal with a seal width of 40 mm at both left and right ends and 8 mm at the lower end. Notch position: 20 mm from the upper edge First cut line: Provided in a V-shape between the notch and the second cut line. Second cut line: Provided in a straight line at a position 20 mm from the upper edge. Third cut line: Provided in straight lines vertically at an interval of 1 mm from the second cut line. Expansion cut line: A straight line with a vertical length of 10 mm at an interval of 15 mm from the inner edges of the left and right side joints.

[0034] [Example 2] A packaging bag P before the upper joint 1 shown in FIG. 1 was formed was produced in the same manner as in Example 1, except that a low-density polyethylene film (LDPE) with a thickness of 90 μm was used for the innermost heat-sealable resin layer 13 of the laminated film 10.

[0035] Regarding Examples 1 and 2 prepared above, an upper joint portion 1 was provided by heat-sealing at the upper part with a seal width of 8 mm. After opening from the notch 5 and removing the opening piece, the laminated film 10 on the front side was torn from the cut line 9 for expansion. Any of the packaging bags of Examples 1 and 2 could be opened along the second cut line 7 to the third cut line 8 through the first cut line 6 by tearing from the notch 5. Furthermore, the laminated film 10 on the front side could be torn from the cut line 9 for expansion, and the packaging bag P could be greatly expanded. In addition, in terms of the tearability from the cut line 9 for expansion, Example 1 could be torn more easily than Example 2.

Explanation of Signs

[0036] P Packaging bag P’ Expanded packaging bag S Opening piece 1 Upper joint portion 2 Lower joint portion 3, 4 Side joint portions 5 Notch 6 First cut line 7 Second cut line 8 Third cut line 9 Cut line for expansion 10 Laminated film 10’ Torn laminated film 11 Base material layer 12 Intermediate layer 13 Heat-sealable resin layer 14 Barrel material 15 Bottom material

Claims

1. In a packaging bag comprising an upper joint part and a lower joint part which are arranged vertically with the surfaces of the heat-sealable resin layers of a laminated film having a heat-sealable resin layer in the innermost layer facing each other, and side joint parts which are arranged horizontally with each other, at least one of the side joint parts is provided with a notch for starting opening, and a first cut line for opening induction having an open shape converging toward the center side of the packaging bag is provided in the vicinity of the center side of the packaging bag closer to the center side than the notch, and a second cut line is provided so as to cross the packaging bag from the converged tip of the first cut line toward the center side of the packaging bag, and third cut lines that do not cross one or more of the first cut lines are provided on both the upper and lower sides of the second cut line, further, an expanding cut line that crosses the second cut line and the third cut line is provided on the center side of the packaging bag at both of the side joint parts, The packaging bag is characterized in that the expanding cut line is a U-shaped curve that bulges toward the lower joint part.

2. The packaging bag according to claim 1, wherein the position where the expanding cut line is provided is in a range 10 mm or more and 30 mm or less away from the inner edge of the side joint part toward the center side of the packaging bag.

3. The packaging bag according to claim 1 or claim 2, wherein the heat-sealable resin layer is made of low-density polyethylene having a thickness of 60 μm or less.

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