JP6259351B2 - Packaging bag and manufacturing method thereof - Google Patents

Description

  The present invention relates to a packaging bag and a method for manufacturing the same, and more particularly to a packaging bag that can maintain a sealed state well and has excellent easy-cut properties and a method for manufacturing the same.

  Conventionally, in a packaging bag formed in a bag shape by a multilayer laminated sheet having a non-heat-sealing layer provided on the front surface side and a heat-sealing layer provided on the back surface side, after the contents are accommodated in the upper opening An opening seal portion formed in the lateral direction of the bag to be heat-sealed and sealed, and an easy-cut portion provided in the lateral direction of the bag that is provided on the bottom side of the bag with respect to the opening seal portion and serves as a guide for opening the bag. There was something. As this easy cut part, it is formed by the linear perforation which consists of a notch part and a non-notch part (for example, refer patent document 1), and is formed by the half cut groove | channel melted | disconnected by the laser. There are some (for example, refer to Patent Document 2), and others that are attached with a cut tape using uniaxially stretched polypropylene to give easy cutting properties (for example, refer to Patent Document 3).

JP-A-8-324597 JP 2002-104437 A JP-A-8-253248

  However, in the above-mentioned Patent Documents 1 and 2, since the perforation and the half cut groove are formed in the non-heat-sealing layer for maintaining the strength, the strength of the packaging bag is lowered, and the impact resistance is reduced. And bending fatigue may occur, and the easy-cut property may be lowered depending on the thickness and material of the heat-sealing layer. Furthermore, in the thing of patent document 1, in the intermediate | middle layer used as a non-heat-fusion layer, in the packaging bag which requires gas barrier properties using an aluminum foil, an ethylene-vinyl alcohol copolymer film, etc., also in this intermediate layer Since the perforation was formed, the gas barrier property was lowered. Moreover, in the thing of patent document 3, although it is effective in the packaging bag formed with a thin multilayer laminated sheet, in the packaging bag formed with the multilayer laminated sheet which has thickness, sufficient effect was not acquired. .

  Therefore, an object of the present invention is to provide a packaging bag that can hold a sealed state well and is excellent in easy-cut property and a method for manufacturing the same.

In order to achieve the above object, the packaging bag of the present invention is formed into a bag shape by a multilayer laminated sheet having a non-heat-sealing layer on at least one side and a heat-sealing layer on at least the other side. In the packaging bag provided with an opening-side seal portion for sealing the inside of the bag, and an easy-cut portion that is formed on the bag bottom side of the opening-side seal portion and serves as a break guide when the bag is opened, the easy-cut The portion is formed by a concave portion in which the thickness of the thermal fusion layer is reduced while maintaining the thickness of the non-thermal fusion layer, and when opening, the easy-cut portion is broken along the concave portion , The array pattern of the recesses formed in one of the multilayer laminate sheet on the front side of the bag or the multilayer laminate sheet on the back side of the bag is a plurality of recesses having a truncated pyramid shape or a truncated cone shape arranged in parallel vertically and horizontally. Before being formed on the other Array pattern of the recesses is characterized in that the truncated pyramid-shaped or truncated cone shape of the plurality of recesses in which are arranged obliquely with respect to the bag vertically.

Also, preferably provided with a chuck the bag bottom side of the easy cut part. Furthermore, it is preferable that a reinforcing portion for preventing the trajectory where the easy-cut portion is broken from deviating from the range of the easy-cut portion is formed on the bag opening side and the bag bottom side of the easy-cut portion. . Moreover, it is suitable when the notch used as the starting point which fractures | ruptures the said easy cut part is formed in the position corresponding to the said easy cut part of a bag side part.

  Furthermore, in order to achieve the above object, the packaging bag manufacturing method of the present invention is formed into a bag shape by a multilayer laminated sheet having a non-heat-sealing layer on at least one side and a heat-sealing layer on at least the other side. The packaging bag is provided with an opening side sealing portion for sealing the inside of the bag on the bag opening side, and an easy-cut portion that is formed on the bag bottom side of the opening side sealing portion and serves as a break guide when the bag is opened. In the manufacturing method, the easy-cut portion heats the multilayer laminated sheet with a heat seal bar, melts the heat-fusible layer, and then cools the multilayer laminated sheet from the non-heat-fusible layer side with a cooling bar. It is formed by processing the concave portion having a thin portion while changing the thickness of the heat fusion layer while maintaining the thickness of the non-heat fusion layer while pressing. It is said.

  Further, the multilayer laminated sheet on the bag front side and the multilayer laminated sheet on the bag back side are overlapped with the respective heat-sealing layers facing each other, with the fusion-preventing member interposed therebetween, After the heat-sealing layer is melted by the pair of heat seal bars respectively arranged on the outer sides of the multilayer laminated sheet, the plurality of concave portions are regularly arranged on the outer sides of both the multilayer laminated sheets. A pair of the cooling bars provided with a processing portion that is arranged and processed in a simple pattern, and the multilayer laminated sheet on the bag front side and the multilayer laminated sheet on the bag back side are arranged in a regular pattern. It is preferable to process the recess. Further, it is preferable that the pair of cooling bars have the processed portions having different arrangement patterns of the concave portions.

  According to the packaging bag of the present invention, the easy-cut portion is formed by the concave portion in which the thickness of the heat-sealing layer is reduced while maintaining the thickness of the non-heat-sealing layer of the multilayer laminated sheet. A multilayer laminated sheet can be broken along the thin-walled portion of the fused layer, and the packaging bag can be opened well. In addition, since the thickness of the non-heat-sealing layer of the easy-cut portion is maintained, it is possible to prevent the strength of the packaging bag from being lowered, and there is no possibility that the impact resistance is lowered and bending fatigue is generated. Furthermore, for packaging bags that require gas barrier properties that use an aluminum foil or ethylene-vinyl alcohol copolymer film as a non-heat-bonding layer as the intermediate layer, both aluminum foil and ethylene-vinyl alcohol for easy-cut portions are used. Since the thickness of the polymer film or the like is maintained, there is no possibility of reducing the gas barrier property.

  In addition, by forming a plurality of recesses and arranging them in a regular pattern, the fracture trajectory can be controlled to some extent by the array pattern of the recesses. Furthermore, by making the arrangement pattern of the recesses of the easy cut portion formed on the multilayer laminate sheet on the bag front side different from the arrangement pattern of the recesses of the easy cut portion formed on the multilayer laminate sheet on the bag back side, Since there is a step at the upper end portion of the bag front side and the bag back side after being cut by the easy cut portion, the opening can be easily opened with a finger. In addition, by providing a chuck on the bottom side of the bag relative to the easy-cut part, the opening can be sealed even after the opening side sealing part that seals the inside of the bag is cut, and the contents are kept in good condition. Can be saved. Furthermore, since the reinforcing portions are formed on the bag opening side and the bag bottom side of the easy-cut portion, there is no possibility of breaking the multilayer laminated sheet outside the range where the easy-cut portion is provided. Moreover, the notch used as the starting point which breaks an easy cut part is formed in the position corresponding to the easy cut part of a bag side part, Tear resistance can be restrained small and an easy cut part can be fractured easily. .

  Moreover, according to the manufacturing method of the packaging bag of this invention, the recessed part which comprises an easy cut part melt | dissolves a heat sealing layer with a heat seal bar, Then, a multilayer laminated sheet is made into the non-heat sealing layer side with a cooling bar. Therefore, it is possible to process a concave part with a thin part by changing the thickness of the heat-sealing layer and maintaining the thickness of the non-heat-sealing layer with a small number of steps. There is no risk of increasing costs.

  Furthermore, the multilayer laminate sheet on the front side of the bag and the multilayer laminate sheet on the back side of the bag are overlapped with the heat fusion layer on the back side of the bag facing each other with the anti-fusing member interposed therebetween, and both layers are laminated. A pair of heat seal bars arranged on the outer sides of the sheets respectively melts the heat-sealing layers of both multilayer laminated sheets, and then is arranged on the outer sides of both multilayer laminated sheets to form a plurality of concave portions regularly. A plurality of recesses arranged in a regular pattern on the multilayer laminated sheet on the bag front side and the multilayer laminated sheet on the bag back side with a pair of cooling bars provided with processing parts arranged and processed in a pattern Since these are processed simultaneously, the efficiency of the manufacturing process can be improved. In addition, the pair of cooling bars each have the processed portions having different arrangement patterns of the recesses, whereby a plurality of different arrangements of the multilayer laminate sheet on the bag front side and the multilayer laminate sheet on the bag back side are provided. The recess can be processed simultaneously.

It is a front view of the packaging bag which shows the 1st form example of this invention. It is a back view of a packaging bag similarly. It is III-III sectional drawing of FIG. It is a principal part enlarged front view of the packaging bag which shows the 1st form example of this invention. It is VV sectional drawing of FIG. It is a principal part expanded rear view of the packaging bag which shows the 1st form example of this invention. It is a front view of the packaging bag of the state cut similarly by the easy cut part. It is VIII-VIII sectional drawing of FIG. It is a principal part enlarged front view of the packaging bag which shows the 2nd form example of this invention. It is XX sectional drawing of FIG. It is a principal part enlarged front view of the packaging bag which shows the 3rd form example of this invention. It is a principal part enlarged rear view of a packaging bag similarly. It is a principal part enlarged front view of the packaging bag which shows the 4th form example of this invention. It is explanatory drawing which shows the manufacturing process of a packaging bag. It is a principal part enlarged front view of the packaging bag which shows the 5th example of this invention. It is XVI-XVI sectional drawing of FIG. It is a principal part enlarged front view of the packaging bag which shows the 6th form example of this invention. It is XVIII-XVIII sectional drawing of FIG.

  FIG. 1 thru | or FIG. 8 is a figure which shows the 1st example of a packaging bag of this invention. The packaging bag 1 of this embodiment is a non-heat-melting bag provided on one side, for example, a bag having a light-shielding property, a gas barrier property, and a sealing property suitable for containing drugs, supplements, retort foods, and the like. Adhesive layer 2a, heat-sealing layer 2b provided on the other side surface, aluminum foil 2c provided between one side surface and the other side surface, and an adhesive layer (heat-sealing layer) provided on both surfaces of the aluminum foil 2c It is formed of a multilayer laminated sheet 2 (hereinafter referred to as a sheet) having an intermediate layer 2e having layers 2d and 2d.

  The packaging bag 1 is formed by stacking the bag front side sheet 3 formed of the sheet 2 and the bag back side sheet 4 with the heat fusion layers 2b and 2b facing each other, and heat-sealing both sides and the bottom. It is formed in a bag shape, and an accommodating portion 5 is formed between the bag front side sheet 3 and the bag back side sheet 4. The bag opening side is provided with an opening side seal portion 6 that seals the inside of the bag after the contents are stored in the storage portion 5, and on the bag bottom side of the opening side seal portion 6 at the time of opening the bag, A first easy cut portion 7 formed on the bag front side sheet 3 serving as a break guide and a second easy cut portion 8 formed on the bag back side sheet 4 are provided in a band shape in the bag lateral width direction. Further, a chuck 9 is provided on the bag bottom side of the first easy cut portion 7 and the second easy cut portion 8. In the present embodiment, since the packaging bag 1 at the stage before the contents are stored inside the packaging bag 1 is illustrated, the opening side seal portion 6 is shown in a state before being sealed. Yes.

  The first easy cut portion 7 and the second easy cut portion 8 are heated after the sheets 2 and 2 are heated by the heat seal bars 22 and 22 to melt the heat sealing layer 2b and the adhesive layers 2d and 2d, and then cooled. It is formed by a plurality of recesses 7a and 8a that are processed by pressing the sheets 2 and 2 while cooling them from the non-heat-bonding layer side with the bars 24a and 24b. As shown in FIG. 4 and FIG. 5, the first easy-cut portion 7 has a plurality of square pyramid-shaped concave portions 7 a arranged in a vertical and horizontal manner (lattice pattern), and the second easy-cut portion 8 has a quadrangular pyramid shape. A plurality of concave portions 8a are arranged obliquely (industry rhombus shape) with respect to the bag vertical direction. The recesses 7a and 8a are processed by reducing the thicknesses of the heat-seal layer 2b and the adhesive layers (heat-seal layers) 2d and 2d while maintaining the thickness of the non-heat-seal layer 2a. Thin portions 7b and 8b are formed at the positions.

  Moreover, the 1st easy cut part 7 and the 2nd easy cut part 8 are provided in the position corresponding to the 1st easy cut part 7 and the 2nd easy cut part 8 of the side seal parts 10 and 10 formed in the bag both sides. Notches 11 and 11 serving as starting points for breaking are formed. The notch 11 includes a stamped portion 11a formed to be thin by being stamped in a wedge shape, and a substantially V-shaped cut portion 11b formed at the center position of the stamped portion.

  The packaging bag 1 formed in this way is opened by linearly breaking the first easy-cut portion 7 and the second easy-cut portion 8 from any of the notches 11b of the notch 11. At this time, in the first easy cut portion 7, for example, as shown by an arrow A in FIG. 4, the first easy cut portion 7 is broken linearly along the thin portion 7b from the cut portion 11b, and in the second easy cut portion 8, For example, as indicated by an arrow B in FIG. 6, the film is once broken obliquely upward along the thin-walled portion 8 b from the cut portion 11 b and then broken linearly. As a result, in the packaging bag 1 after opening, a step is formed between the upper end portion of the bag front side sheet 3 and the upper end portion of the bag back side sheet 4.

  As described above, the packaging bag 1 of the present embodiment has the first easy-to-cut portion 7 and the second easy-to-cut portion 8 that are thermally fused while maintaining the thickness of the non-thermally fused layer 2a of the sheet 2. The sheet 2b and the adhesive layer (heat-sealing layer) 2d and 2d are formed of a plurality of recesses 7a and 8a, and the sheet is formed along the thin-walled portions 7b and 8b provided at the recess formation position. 2 can be broken, and the packaging bag 1 can be opened well. Further, since the thickness of the non-heat-sealing layer 2a of the sheet 2 is maintained, it is possible to prevent the strength of the packaging bag 1 from being lowered, and there is no possibility that the impact resistance is lowered or bending fatigue is caused. Furthermore, since the thickness of the aluminum foil 2c is maintained, there is no possibility of deteriorating the gas barrier property.

  Further, in the first easy cut portion 7, the plurality of concave portions 7a are arranged in parallel in the vertical and horizontal directions, and in the second easy cut portion 8, the plurality of concave portions 8a are arranged obliquely with respect to the bag vertical direction. The easy cut portion 7 and the second easy cut portion 8 have different breaking trajectories, and a step is formed between the upper end portion of the bag front side sheet 3 and the upper end portion of the bag back side sheet 4, so that the first easy cut portion 7 and the second easy cut portion 8 The opening after breaking the portion 8 can be favorably opened with a finger. Further, by providing the chuck 9 closer to the bag bottom than the first easy cut portion 7 and the second easy cut portion 8, the opening is sealed even after the opening side seal portion 6 for sealing the inside of the bag is cut. And the contents can be stored in good condition. Furthermore, by providing notches 11 and 11 at positions corresponding to the first easy-to-cut portion 7 and the second easy-to-cut portion 8 of the side seal portions 10 and 10 on both sides of the bag, the tear resistance is suppressed to a low level. The easy cut portion 7 and the second easy cut portion 8 can be easily broken from the cut portion 11b.

  FIG. 9 thru | or FIG. 13 shows the other form example which made the easy cut part into another shape, and in the 2nd form example shown by FIG.9 and FIG.10, the 1st easy formed in the bag front side sheet | seat 3 is shown. The cut part 12 is formed by one recessed part 12a processed in the bag width direction. The first easy cut portion 12 is appropriately broken within the range of the thin portion 12b formed by the concave portion 12a as shown by the arrow C at the time of opening. In the third embodiment shown in FIGS. 11 and 12, the first easy cut portion 13 formed on the bag front side sheet 3 has a plurality of truncated conical recesses 13 a arranged in parallel in the vertical and horizontal directions. In the formed second easy cut portion 14, a plurality of truncated conical recesses 14a are arranged obliquely with respect to the bag vertical direction. Moreover, in the 4th example shown in FIG. 13, the 1st easy cut part 15 has the several recessed part 15a arranged in parallel in the bag width direction.

  Each easy-cut part shown in each of the above-described embodiments can be provided in the bag front side sheet 3 and the bag back side sheet 4 in an appropriate combination according to the material of the sheet, the type of the contents to be accommodated therein, and the like. The trajectory of the break can be controlled according to the shape and arrangement pattern of the recesses constituting each easy-cut portion and the tear strength.

  Next, polyethylene terephthalate (PET) as a non-heat-bonding layer: 12 μm thick, linear low-density polyethylene (LLDPE) as a heat-bonding layer: 70 μm thick, and an aluminum foil (AL ): A multilayer laminated sheet 2 having a thickness of 7 μm was produced, and the tear strength of the multilayer laminated sheet 2 is shown in Table 1. Furthermore, the first easy-cut portion 7 and the second easy-cut portion 8 of the first embodiment described above and the first easy-cut portion 12 of the second embodiment are formed on the multilayer laminated sheet 2 respectively. The tear strength (N) of the cut portion was compared and shown in Table 2.

  As shown in Tables 1 and 2, it is possible to lower the tear strength by providing the first easy cut portion 7, the second easy cut portion 8, and the first easy cut portion 12 as compared with the unprocessed multilayer laminated sheet 2. It can be easily broken. Furthermore, it turned out that what provided the 2nd easy cut part 8 has the lowest tear strength.

  Next, the manufacturing method of the above-mentioned packaging bag 1 is demonstrated based on FIG. First, the two sheets 2 and 2 are sent out on the packaging bag manufacturing lane in a state where the heat sealing layers 2b and 2b are opposed to each other. In addition, a pair of chuck portions 9 a and 9 b that are engaged with each other to form the chuck 9 are formed on the sheets 2 and 2 in advance by extrusion.

  Next, the anti-fusing member 21 is interposed on the bag opening side of the two sheets 2, 2, and the pair of heat seal bars 22, 22 respectively disposed on the outer sides of both sheets 2, 2 The sheets 2 and 2 are heated to melt the heat sealing layer 2b and the adhesive layer 2d, respectively. Further, the heat sealing layers 2b and 2b are welded to the bag bottom portion side of the two sheets 2 and 2 by the bag bottom heat seal bar 23 to form the bag bottom portion.

  Next, while cooling both the sheets 2 and 2 with the anti-fusing member 21 interposed therebetween, a pair of cooling bars 24a and 24b respectively disposed on the outside of the bag opening side of both the sheets 2 and 2 The plurality of recesses 7a and 8a are processed. The pair of cooling bars 24a and 24b have processing portions 24c and 24d for processing the plurality of recesses 7a and 8a in regular and different arrangement patterns, respectively, and in the present embodiment, they are on the bag front side. The sheet 2 has a plurality of quadrangular frustum-shaped recesses 7a arranged in parallel in the vertical and horizontal directions to form the first easy-to-cut parts 7, and the sheet 2 on the back side of the bag has a plurality of quadrangular frustum-shaped recesses 8a. The second easy-to-cut portions 8 are formed obliquely with respect to the bag vertical direction. Further, when the recesses 7a and 8a are processed, the heat-sealing layer 2b and the adhesive layer 2d of each sheet 2 in a molten state are melted by the pair of cooling bars 24a and 24b arranged on the outer side of the bag. Since it is pressed toward the attachment preventing member 21, the thin-walled portions 7b and 8b are formed at the recess forming positions. Furthermore, the bag bottom side of the two sheets 2 and 2 is cooled by the bag bottom cooling bar 25, and the bottom of the bag is sealed.

  Next, both sides of the bag are fused by the side seal bars 26, 26 and cooled by the side cooling bar 27. Next, the positions corresponding to the first easy-cut portion 7 and the second easy-cut portion 8 on both sides of the fused bag are stamped by the spot presser 28 to form the thin wedge-shaped stamp portion 11a, and then notch processing The notch 11 is formed by cutting the center position of the stamped portion 11a into a V shape by the device 29 to form the cut portion 11b. Finally, the center portion in the width direction of the heat seal portion fused by the side seal bars 26, 26 is cut by the shear cutter 30 to manufacture the packaging bag 1.

  According to the method for manufacturing a packaging bag as described above, the thickness of the heat-sealing layer 2b is changed and the thin portions 7b and 8b are provided in a few steps while maintaining the thickness of the non-heat-sealing layer 2a. Moreover, the 1st easy cut part 7 and the 2nd easy cut part 8 provided with several recessed part 7a, 8a can be formed, and there is no possibility that cost may increase. Furthermore, the first easy cut provided with a plurality of 7a, 8a having different arrangements on both sheets 2, 2 using a pair of heat seal bars 22, 22 and a pair of cooling bars 24a, 24b having different processing patterns. Since the part 7 and the 2nd easy cut part 8 can be formed simultaneously, efficiency improvement of a manufacturing process can be achieved.

  FIGS. 15 to 17 show fifth and sixth embodiments of the present invention. Components that are the same as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is provided. Is omitted.

  FIGS. 15 and 16 show a fifth embodiment of the present invention. Balls 41 and 41 formed by extrusion molding on the upper side and the lower side of the first easy cut portion 7 and the second easy cut portion 8. (Reinforcing part of the present invention) is provided. FIGS. 17 and 18 show a sixth embodiment of the present invention. Reinforcing tapes 42 and 42 (the present invention) are provided on the upper side and the lower side of the first easy cut portion 7 and the second easy cut portion 8. Are attached to each other. According to the second and third embodiments, the upper side and the lower side of the first easy-cut portion 7 and the second easy-cut portion 8 are reinforced by the bead 41 and the reinforcing tape 42. Even if the easy-cut portion 7 and the second easy-cut portion 8 are ruptured vigorously, there is no possibility of rupturing the sheets 2 and 2 outside the range where the first easy-cut portion 7 and the second easy-cut portion 8 are provided.

  Note that the present invention is not limited to the above-described embodiments, and the shape of the packaging bag is arbitrary and can be applied to those having a gusset at the bottom or side, and also to a packaging bag without a chuck. Can be applied. Further, the sheet 2 only needs to have a non-heat-sealing layer on at least one side surface and a heat-sealing layer on at least the other side surface, and may not have an intermediate layer such as an aluminum foil. Furthermore, the shape and arrangement pattern of the recesses constituting the easy-cut portion are arbitrary, and the same-shaped easy-cut portion may be formed on the bag front side multilayer laminate sheet and the bag back side multilayer laminate sheet. Further, the shape of the notch is not limited to the present embodiment, and it does not matter if the notch is not provided.

DESCRIPTION OF SYMBOLS 1 ... Packaging bag, 2 ... Multi-layer laminated sheet, 2a ... Non heat sealing layer, 2b ... Heat sealing layer, 2c ... Aluminum foil, 2d ... Adhesive layer, 2e ... Intermediate layer, 3 ... Bag front side sheet, 4 ... Bag Back side sheet, 5 ... receiving part, 6 ... opening seal part, 7 ... first easy cut part, 7a ... concave part, 7b ... thin part, 8 ... second easy cut part, 8a ... concave part, 8b ... thin part, 9 ... Chuck, 9a, 9b ... chuck part, 10 ... side seal part, 11 ... notch, 11a ... stamping part, 11b ... notch part, 12 ... first easy cut part, 12a ... concave part, 12b ... thin part, 13 ... first 1 easy cut part, 13a ... concave part, 14 ... second easy cut part, 14a ... concave part, 15 ... first easy cut part, 15a ... concave part, 21 ... anti-fusing member, 22 ... heat seal bar, 23 ... bag bottom part Heat sealing bar, 24a, 24b ... cooling bar, 25 ... bag bottom cooling bar, 26 ... side cover Ruber, 27 ... side cooling bars, 28 ... spot presser, 29 ... notch machining unit, 30 ... shear cutter, 41 ... beaded, 42 ... reinforcing tape

Claims (4)

An opening side seal portion for sealing the inside of the bag on the bag opening side, which is formed in a bag shape by a multilayer laminated sheet having a non-heat sealing layer on at least one side surface and a heat sealing layer on at least the other side surface, and the opening In the packaging bag which is formed on the bag bottom side from the side seal part and is provided with an easy cut part that serves as a guide for breaking when the bag is opened, the easy cut part maintains the thickness of the non-heat-bonding layer. While being formed by a recess with a reduced thickness of the heat-fusible layer, when opening, the easy-cut portion is broken along the recess ,
The array pattern of the recesses formed in one of the multilayer laminate sheet on the front side of the bag or the multilayer laminate sheet on the back side of the bag is a plurality of recesses having a truncated pyramid shape or a truncated cone shape arranged in parallel vertically and horizontally. Is,
The packaging pattern, wherein the concave pattern formed on the other side is formed by arranging a plurality of quadrangular pyramid-shaped or truncated cone-shaped concave sections obliquely with respect to the bag vertical direction . Packaging bag according to claim 1, characterized in that it comprises a chuck the bag bottom side of the easy cut part. A reinforcing portion is formed on the bag opening side and the bag bottom side of the easy-cut portion to prevent a track on which the easy-cut portion is broken from deviating from the range of the easy-cut portion. The packaging bag according to claim 1 or 2 . The packaging bag according to any one of claims 1 to 3 , wherein a notch serving as a starting point for breaking the easy-cut portion is formed at a position corresponding to the easy-cut portion of the bag side portion.

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