JP4946708B2 - Easy-open packaging bag - Google Patents

Description

  The present invention relates to a packaging bag for storing solid, granular confectionery, food, medicine, cosmetics, or the like, and more specifically, a wider opening is formed along the opening cut line than the opening knob. The present invention relates to an easy-open packaging bag that can be opened easily.

  Conventionally, snack confectionery, snack foods, salmon, biscuits, snacks, etc. are directly stored in packaging bags such as four-side seal, three-side seal, gusset type, or self-supporting type with a gusset portion at the bottom.

  These packaging bags are provided with notches such as an I shape, a V shape, and a turtle shell shape as opening opening means in order to facilitate opening (for example, see Patent Document 1). Further, a packaging bag is disclosed in which the opening means is used in combination with a plastic film in which a straight easy tear film is laminated in order to improve the opening property, and further, an opening break is provided in connection with the opening means. (For example, refer to Patent Document 2). However, these packaging bags are configured such that the edges are opened. For example, in the case of a packaging bag containing potato chips or the like, when the potato chips or the like are consumed and reduced, the bottom of the packaging bag is removed. There are inconveniences that it has to be taken out as if looking into it, and it is difficult to take out, and there is a problem that the back and palm of the hand are soiled in addition to the finger that picks up the potato chip in order to put the hand deeply.

An opening / closing lid made of an airtight film that has a center seal portion and both end seal portions, and is formed with a take-out port provided with a cut portion for separation on the other surface facing the center seal portion. There is known a rectangular cosmetic encapsulating bag provided with (for example, see Patent Document 3). The opening of the enclosing bag is provided in the center of the bag so that the contents can be easily taken out. However, when the airtight film covering the cut portion is fixed, the sheet or the sheet material constituting the encapsulating bag may be wrinkled. In such a case, sufficient airtightness cannot be obtained. For example, moisture absorption such as rice crackers or biscuits If the confectionery is rich, the confectionery may absorb moisture and the taste may be significantly reduced. Moreover, since an airtight film is required as a separate part, there is a problem that the cost increases.
Utility Model Registration No. 3001221 Japanese Patent Laid-Open No. 10-167317 Japanese Patent Publication No. 2-30948

  Therefore, the present invention has been made to solve the above problems, and can be easily opened so that a wide opening can be formed along the opening cut line from the opening knob, so that the contents can be taken out easily. To provide packaging bags.

  In order to achieve the above object, the present invention according to claim 1 is directed to a rectangular substrate having at least a base material layer and an inner layer made of a heat-adhesive resin, with the inner layers facing each other. The side edge thermal bonding portion at a pair of opposite end edges and the edge thermal bonding portion at one edge perpendicular to the side edge thermal bonding portion and the edge thermal bonding portion side with respect to the edge thermal bonding portion side. A packaging bag that is provided with a substantially U-shaped partition wall thermal bonding portion that has a bent portion across the side edge thermal bonding portion, and is thermally bonded so as to be peelable at the side edge thermal bonding portion and the partition thermal bonding portion. In addition, an unsealed portion is provided in the edge thermal bonding portion, straddles the bent portion, reaches the outer edge of the unsealed portion from the partition thermal bonding portion or the vicinity of the outer edge thereof, and penetrates the base body constituting one surface. Each cut line is formed and the bent portion is connected to each cut line and the unsealed An unsealing portion around the outer edge of the partition wall or the outer edge of the opening knob is provided at or near the end of the opening portion of the opening portion on the side of the partition wall thermal bonding portion. An easy-opening characterized in that an opening cut line is provided on the base that constitutes one surface along the partition thermal bonding portion, and the opening is opened along the opening cut line from the opening knob. It is a sex packaging bag.

  Further, the present invention according to claim 2 is composed of a front side sheet, a back side sheet and a bottom sheet provided with at least a base material layer and an inner layer made of a heat-adhesive resin. The inner layer surfaces are arranged to face each other, and the bottom sheet, which is mountain-folded at the center with the inner layer surface outside, is inserted between the lower portions of the sheets to face the inner layer surfaces of the front and back side sheets. The bottom edge is formed by thermally bonding the peripheral thermal bonding portions provided at the peripheral edges between the outer surfaces of the mountain-folded bottom sheet, and the side edge thermal bonding portions and the bottom portions are formed at opposite ends of the pair of front and back side sheets. In a self-supporting packaging bag having an edge thermal bonding portion on an edge facing the bent portion, the bent portion is thermally bonded to the bottom portion so as to be able to peel over the side edge thermal bonding portion with respect to the lower end side of the bottom portion. A substantially U-shaped partition wall heat bonding part having Any one of the front and back side sheets that is provided with an unsealed portion at the peripheral thermal bonding portion facing the bent portion, straddles the bent portion, reaches the outer edge of the unsealed portion from the partition thermal bonded portion or the vicinity of the outer edge thereof. The opening knob is provided with either one or both of cut lines penetrating the front and back side sheets, and the bent part is surrounded by the cut line and the outer edge of the unsealed part. Any one of the front and back side sheets along the partition heat-bonded portion from the end of the partition line on the partition heat-bonded portion side or the vicinity thereof to the unsealed portion of the partition heat-bonded portion or the outer periphery thereof One or both of the front and back side sheets are provided with an opening cut line, and are opened along the opening cut line from the opening picking portion. .

  The present invention according to claim 3 is the easily openable packaging bag according to claim 1 or 2, wherein the opening cut line is a half cut that does not penetrate the substrate. It is a bag.

  Further, the present invention according to claim 4 is the easily openable packaging bag according to claim 1 or 2, wherein the opening cut line is formed by intermittent cuts, and the cuts are parallel to the partition thermal bonding portion. And a hatched portion extending obliquely at an obtuse angle with respect to the linear portion from the rear end side toward the side edge thermal adhesive portion with respect to the direction of the opening knob portion of the linear portion. And the tip of the first cut is formed to be connected to or near the end of the cut line of the opening knob on the side of the partition heat-bonding portion. Is.

  Further, the present invention according to claim 5 is the easily openable packaging bag according to any one of claims 1 to 4, wherein the bent portion of the substantially heat-separated partition wall heat bonding portion is the edge heat bonding. Or a mountain-shaped seal portion having one or a plurality of protruding portions protruding to the edge thermal bonding portion side or the bottom lower end side. Is provided.

  Moreover, this invention of Claim 6 is an easily openable packaging bag in any one of Claims 1-4. WHEREIN: The said bending part of the said substantially square-shaped said partition heat bonding part is the said edge thermal bonding. It is characterized in that there is provided at least one shed-like seal portion projecting to the part side or the bottom lower end side.

  Moreover, this invention of Claim 7 is an easily openable packaging bag in any one of Claims 4-6. WHEREIN: The rear end of the said cut | interruption cut line, and the front-end | tip of the linear part of the next cut | interruption Are aligned with the opening direction or at least overlap with each other.

  Moreover, this invention of Claim 8 is an easily openable packaging bag in any one of Claim 3, 5 or 6 WHEREIN: The front end by the side of the said opening knob | pick part of the said opening cut line which consists of the said half cut Is formed in a U-shape.

  Further, the present invention according to claim 9 is the easily openable packaging bag according to any one of claims 4 to 7, wherein the tip of the straight portion of the first cut forming the opening cut line is U. It is formed in the shape of a character.

  Moreover, this invention of Claim 10 is the said easily-openable packaging bag in any one of Claims 1-9. WHEREIN: The said edge thermal bonding part which provided the said unsealed part, or the said bending part is opposed. A protruding seal part surrounding the opening knob is provided in the vicinity of the unsealed part side of the peripheral heat bonding part.

  Moreover, this invention of Claim 11 is an easily openable packaging bag in any one of Claims 1-10. WHEREIN: The said edge thermal bond part, the said side edge thermal bond part, and the said partition thermal bond part A point seal portion is provided in an unsealed region surrounded by the protruding seal portion, or in an unsealed region surrounded by the peripheral heat bonding portion, the partition heat bonding portion, and the protruding seal portion. Is.

  The invention according to claim 12 is characterized in that, in the easy-open packaging bag according to any one of claims 1 to 11, a spot seal portion is provided in the opening knob.

  The easy-open packaging bag according to claim 1 is provided with a substantially U-shaped partition wall heat-bonding portion having a bent portion that is heat-bonded so as to be peelable and an unsealed portion around the partition wall heat-bonding portion or an outer edge thereof. A tear line for opening is provided, an unsealed part is provided at the edge thermal bonding part, straddles the bent part, reaches the outer edge of the unsealed part from the thermal bonding part of the partition wall or near its outer edge, and penetrates the substrate constituting one surface An opening knob is provided in which each cut line is formed and the bent part is surrounded by each cut line and the outer edge of the unsealed part, and the opening knob is easily picked with fingers, and the opening cut line is formed. It can be opened easily so that a wide opening is formed along it, the contents can be easily taken out, and the contents can be taken out without soiling the back and palm of the hand even if the contents are reduced. Further, the opening line of the opening knob and the opening line of the opening are provided in the partition thermal bonding portion or the unsealed portion around the outer edge thereof, the partition thermal bonding portion, the side edge thermal bonding portion, and the edge thermal bonding portion. As a result, the barrier property and moisture resistance of the sealed and easily openable packaging bag are ensured, and moisture absorption prevention of the contents to be stored can be achieved.

  The easily openable packaging bag according to claim 2 is provided with a substantially U-shaped partition wall heat-bonding portion having a bent portion that is heat-bonded to the bottom portion so as to be peeled off, and is not attached to the peripheral heat-bonding portion facing the bent portion. Provided with a seal part, straddles the bent part and reaches the outer edge of the unsealed part from the vicinity of the partition thermal adhesive part or its outer edge, and a cut line that penetrates the front and back side sheet is formed on either or both of the front and back side sheets. The opening knob is surrounded by the cut line and the outer edge of the unsealed part. The opening knob can be easily picked with fingers and easily opened along the opening line. . In addition, the opening break line is provided along the partition wall heat-bonding portion on the partition heat-bonding portion provided on the bottom or the unsealed portion around the outer edge, and the barrier property and moisture-proof property of the easy-open packaging bag are: Since the partition heat-bonding portion, the side edge heat-bonding portion, and the edge heat-bonding portion are sealed and secured, it is possible to prevent moisture absorption of the contents to be stored.

  Further, the easy-open packaging bag according to claim 3 is configured such that the opening cut line is made of a half cut that does not penetrate the base, and the base constituting one surface when opened from the opening knob is, The opening line can be opened without losing the opening line, and the opened opening line is beautiful. Further, the substrate can be prevented from being broken or mischievous at the opening cut line due to vibration or shock during distribution.

  The easy-open packaging bag according to claim 4, wherein the opening cut line consists of intermittent cuts, the cut line extending in a direction parallel to the partition wall heat-bonding part, and the opening part of the straight part. With the oblique line extending obliquely at an obtuse angle with respect to the linear part from the rear end side toward the side edge thermal bonding part with respect to the direction of It is formed in the vicinity of the end part on the heat bonding part side or is formed in the vicinity thereof, and when opened from the opening knob, the substrate constituting one surface can be opened without coming off from the opening cut line. effective.

  Further, the easy-open packaging bag according to claim 5 has a straight portion of a predetermined length parallel to the edge thermal bonding portion side or the bottom lower end at the bent portion of the substantially U-shaped partition wall thermal bonding portion, The straight part is provided with an edge heat-bonding part or a mountain-shaped seal part with one or more protrusions protruding to the bottom lower end side, which can reduce the tensile force required at the beginning of opening, and is a pick for opening The part can be easily peeled by pulling the part, and can be opened smoothly.

  Further, the easy-open packaging bag according to claim 6 is provided with at least one lip-shaped sealing portion in which a bent portion of the substantially U-shaped partition wall thermal bonding portion projects toward the edge thermal bonding portion side or the bottom lower end side. The pulling force required in the initial stage of opening can be further reduced, and the opening knob can be pulled to start opening smoothly.

  Further, the easy-open packaging bag according to claim 7 is formed such that the rear end of the opening cut line and the front end of the straight line of the next cut coincide with each other or at least overlap. Therefore, when the opening knob is pulled and opened, it is possible to prevent the opening from being removed from the opening cut line so that it cannot be opened, and the opening can be opened along the opening cut line.

  Further, the easy-open packaging bag according to claim 8 has a structure in which the tip on the side of the opening knob portion of the opening cut line made of a half cut is formed in a U-shape, so that the opening opening knob portion It is possible to prevent the substrate from being torn from the tip of the opening cut line when the substrate is torn from both ends of the cut line of the opening knob when opened and the tearing direction is guided by the opening cut line. Further, the easy-open packaging bag according to claim 9 has a configuration in which the tip of the straight part of the first cut forming the opening cut line is formed in a U-shape, so that the opening picking part has It is possible to prevent the substrate from being torn from the tip of the opening cut line when the substrate is torn from both ends of the cut line of the opening knob when opened and the tearing direction is guided by the opening cut line.

  Further, the easy-open packaging bag according to claim 10 is a protruding seal that surrounds the unsealing knob portion in the vicinity of the unsealed portion side of the peripheral heat bonded portion that faces the edge heat bonded portion or the bent portion provided with the unsealed portion. The lower end that forms the unsealed region surrounded by the edge thermal adhesive part, the side edge thermal adhesive part, the partition thermal adhesive part, and the protruding seal part, or the bottom from the cut line of the opening knob It is possible to reduce the entry of foreign matter into an unsealed region surrounded by the edge thermal bonding portion, the side edge thermal bonding portion, the partition thermal bonding portion, and the protruding seal portion.

  Moreover, the easily openable packaging bag of Claim 11 is the lower end which forms the unsealed area | region enclosed by the edge thermal-bonding part, the side edge thermal-bonding part, the partition thermal-bonding part, and the protrusion sealing part, or a bottom part. Unsealed from the cut line of the opening knob by adopting a configuration in which a point seal part is provided in the unsealed area surrounded by the edge thermal adhesive part, the side edge thermal adhesive part, the partition thermal adhesive part, and the protruding seal part. The entry of foreign matter into the area can be further reduced.

  Further, the present invention according to claim 12 is configured such that the opening knob is provided with a spot seal part, and curling occurs in the opening knob, or an external force is applied by handling or impact during distribution or transportation. However, it is possible to prevent the opening knob from being picked and accidentally pulled to damage or open the lid.

The above-described present invention will be described below with reference to the drawings.
1 is a plan view showing a first embodiment of an easy-open packaging bag according to the present invention, FIG. 2 is a sectional view taken along line XX in FIG. 1, and FIG. 3 is a cut line and a cut in the circle of FIG. FIG. 4 is an enlarged view, FIG. 4 is a perspective view showing a state in the middle of opening of the easy-open packaging bag, FIG. 5 is a plan view showing a second embodiment of the easy-open packaging bag according to the present invention, and FIG. FIG. 7 is a plan view showing a third embodiment of the easy-open packaging bag according to the present invention, and FIG. 8 is a plan view showing a fourth embodiment of the easy-open packaging bag according to the present invention. Yes, symbols 1, 21, 31, and 41 in the figure are easy-open packaging bags, 2 is a base material layer, 3 is an intermediate layer, 4 is an inner layer, 5 is a base body, 6 and 26 are side edge thermal bonding portions, 7, 27, 37 Upper edge thermal adhesive portion, 7 'is lower edge thermal adhesive portion, 8, 28, 38 is partition thermal adhesive portion, 8' is peeling trace, 9, 29, 39 are bent portions, 9a, 29a are Straight section , 9b, 29b are angled seals, 10, 30, 310 are cut lines, 11, 31 are opening knobs, 12, 32, 312, and 412 are opening cut lines, 13 are cut lines, and 13a is a straight line part. 13b is the hatched portion, 13h is the leading end of the cut, 13t is the trailing end of the cut, 131 and 131 'are the first cut, 132 is the second cut, 133 is the third cut, 14 is the tear piece, and 15 is the opening Part, 22 is a front side sheet, 23 is a back side sheet, 24 is a bottom sheet, 25 is a bottom part, 33 is a peripheral heat bonding part, 37a is a projecting seal part, 39c is a mouth-like seal part, 39d is a curved seal 131'h is the tip of the first cut, 312h is the tip of the opening cut line on the opening knob side, A is a notch, N is an unsealed portion, P is a point seal portion, and R is not sealed Area, S is spot seal Respectively.

  1st embodiment of the easy-open packaging bag of this invention is as showing in FIG. 1, FIG. The easy-open packaging bag 1 of the present invention is opposed to a rectangular base 5 having a base layer 2, an intermediate layer 3, and an inner layer 4 made of a heat-adhesive resin, with the inner layers 4 facing each other. A pair of both end edges are thermally bonded to a side edge thermal bonding portion 6 and another set of upper and lower edge thermal bonding portions 7 and 7 ′ orthogonal to and opposed to the side edge thermal bonding portion 6, and the upper end A substantially U-shaped partition wall thermal bonding portion 8 having a bent portion 9 is provided across the side edge thermal bonding portions 6 and 6 with respect to the edge thermal bonding portion 7 side. This is an easy-open packaging bag of a four-side seal type that is thermally bonded so as to be peelable at the bonding portion 8. The bent portion 9 of the partition wall heat-bonding portion 8 has a straight portion 9 a having a predetermined length parallel to the upper-end edge heat-bonding portion 7, and the upper-end edge heat-bonding portion 7 facing the bent portion 9 has an unsealed portion N. Is provided. Furthermore, the cut lines 10 and 10 are formed so as to cross the bent portion 9 and reach the outer edge of the partition wall thermal bonding portion 8 or the vicinity of the outer edge thereof to the outer edge of the unsealed portion N and penetrate the base body 5 constituting one surface, respectively. An opening knob 11 surrounded by the cut lines 10 and 10 and the outer edge of the unsealed part N is provided, and the partition thermal adhesive part from the end of the opening line 11 of the opening knob 11 on the partition thermal adhesive part 8 side. 8 or an unsealed portion around the outer edge thereof is provided with an opening cut line 12 that penetrates through the base body 5 constituting one surface along the partition wall heat bonding portion 8. The cut line 10 can be provided in the partition thermal bonding portion 8, but is preferably provided in an unsealed portion around the outer edge of the partition thermal bonding portion 8 in view of unsealing properties. Further, the cut line 10 may be partially provided with a non-cut that does not penetrate the base 5 to form a pawl. Although not shown, for example, contents such as confectionery such as rice crackers and biscuits, which are rich in hygroscopicity, are surrounded by the side edge thermal bonding part 6, the partition thermal bonding part 8, and the lower edge thermal bonding part 7 '. It is housed in a sealed area and sealed.

  The bent portion 9 of the partition wall heat-bonding portion 8 has a straight portion 9a having a predetermined length parallel to the upper-end edge heat-bonding portion 7, and one or a plurality of protrusions projecting toward the upper-end edge heat-bonding portion 7 side. A mountain-shaped seal portion 9b having a protruding portion is provided. By adopting such a configuration, when picking the opening knob 11 and opening the easy-open packaging bag 1, the pulling force required at the initial stage of opening can be reduced, and the opening knob 11 is pulled. Can be easily peeled off, and the opening can be smoothly started. One or a plurality of protruding portions of the mountain-shaped seal portion 9b protrude depending on the length of the linear portion 9a of the bent portion 9, and it is preferable to increase the number of protruding portions as the length increases. In addition, although it can open even if it does not provide the mountain-shaped seal | sticker part 9b, since the opening start can be performed smoothly, providing is preferable. Moreover, without providing the linear part 9a in the bending part 9, shapes, such as a mountain shape, a round shape, and a protrusion shape, may be sufficient, for example, and it is not limited to the shape of description.

  Next, the laminated structure of the base | substrate 5 which comprises the easy-open packaging bag 1 is demonstrated. As shown in FIG. 2, the structure of the substrate 5 is based on chemical protection functions (gas barrier properties, moisture permeability, etc.) and physical protection functions (tensile strength, impact strength, etc.) required for the contents to be stored. Base layer 2 / printing layer (not shown) / intermediate layer 3 / inner layer 4 or base material layer 2 / printing layer (not shown) / inner layer 4 can be appropriately designed as a basic configuration. The base material layer 2 is made of a biaxially stretched plastic film such as nylon, polyethylene terephthalate, or polypropylene, a film in which such a film is coated with a barrier material such as polyvinyl alcohol or vinylidene chloride, and an inorganic material such as silicon oxide or aluminum oxide. A vapor deposited film is used. Although not shown, the printing layer is provided by, for example, gravure printing on the surface of the base material layer 2 facing the intermediate layer 3. Further, the thickness of the film constituting the base material layer 2 may be a thickness that can be kept to the minimum necessary for printability, strength, rigidity, etc., and may be determined in consideration of the cost, etc. 40 μm.

For the intermediate layer 3, a barrier film such as ethylene vinyl alcohol, a film on which a metal such as aluminum foil or aluminum is deposited, and a film used for the base material layer 2 are used. For the inner layer 4, polyethylene, ethylene / vinyl acetate copolymer, ionomer, polypropylene, or easily peelable heat-adhesive resin (EPR) is used after film or extrusion lamination. In addition, as a method for imparting easy peelability of EPR, a method of forming a multilayer structure in which a thin layer having a weak adhesive force is provided on the surface, a method of expressing easy peelability by a configuration such as blending a resin having low compatibility, etc. These known ones are appropriately employed. Each of the above layers is laminated by a known technique such as a dry lamination method or an extrusion lamination method to form a laminated material. For example, as a specific laminated structure example of the substrate 5, the following structure can be given.
(1) OPP / DL / PET / DL / PEF, EVA or ionomer (2) PET / DL / EPR
(3) PET / DL / ON / DL / PEF
(4) OPP / DL / PEF or CPP
(5) ON / DL / PEF
The abbreviations used in the description of the configuration examples are as follows. OPP: biaxially stretched polypropylene film, PET: biaxially stretched polyester film, PEF: polyethylene film, EVA: ethylene / vinyl acetate copolymer, CPP: unstretched polypropylene film, DL: dry laminate adhesive.

  The structure of the opening part of the easy-open packaging bag 1 of this invention is demonstrated in detail using FIG. 1, FIG. FIG. 3 is an enlarged view in the circle of FIG. 1 and shows the structure of the opening portion. The opening cut line 12 provided on the base 5 is composed of intermittent cuts 13, the cut line 13 extending in a direction parallel to the partition wall heat bonding part 8, and an opening knob for the straight line part 13 a. 11 is formed of a hatched portion 13b extending obliquely at an obtuse angle with respect to the linear portion 13a from the rear end side toward the side edge thermal bonding portion 6 from the rear end side, and the tip 13h of the first cut 131 is a pick for opening. It is formed so as to be connected to the end portion of the cut line 10 of the part 11 on the side of the partition wall heat bonding part 8 and is opened along the cut line 12 for opening from the opening knob 11. The rear end 13t of the first cut 131 of the opening cut line 12 and the tip 13h of the straight portion 13a of the second cut 132 may coincide with each other or be at least overlapped with each other. preferable. By doing so, when the opening knob 11 is pulled to open the base body 5, the base body 5 is torn from the rear end 13 t of the first cut 131 and connected to the second cut 132, and the second cut 132. Thus, the tearing direction is guided to the next third cut 133, and can be prevented from being unsealable by coming off from the opening cut line 12 in a similar and repeated manner along the opening cut line 12. Can be opened. Moreover, the cut line 10 and the opening cut line 12 of the opening knob 11 are provided at the outer edge of the partition heat bonding part 8, and the inside of the easy-open packaging bag 1 has a side edge with the partition heat bonding part 8. Since it is sealed by the edge heat bonding part 6 and the lower edge heat bonding part 7 ', barrier properties and moisture resistance are secured, and moisture absorption prevention of the contents accommodated in the bag can be achieved. In addition, the code | symbol of the 1st cut | interruption 131, the 2nd cut | interruption 132, and the 3rd cut | interruption 133 is attached on description, and the cut | disconnection 13 and a shape and a function are the same.

  Next, the manufacturing method of the base | substrate 5 is demonstrated. First, a printed pattern is back printed on the surface of the base material layer 2 facing the intermediate layer 3 by a gravure printing method. Thereafter, the intermediate layer 3 and the inner layer 4 are sequentially laminated by a dry lamination method or an extrusion lamination method, whereby the winding of the substrate is manufactured. Next, while unwinding the winding of the substrate obtained in the punching step, the cut line 10 and the cut 13 are penetrated to the base material layer 2, the intermediate layer 3 and the inner layer 4 at predetermined positions according to the printing register, for example, The base 5 is manufactured by using a rotary die cutter, provided with a picking part 11 for opening and a cut line 12 for opening. The printed pattern may be provided on the surface of the intermediate layer 3 facing the base material layer 2 or the surface facing the inner layer 4.

  After the substrate 5 manufactured as described above is cut into a predetermined width and wound up, the content is filled and sealed with a content filling machine, whereby the easy-open packaging bag 1 is manufactured. Moreover, after winding said base | substrate 5 into a four-sided seal bag with a bag making machine, you may fill with the content with a filling machine. In addition, for example, a rotary die cutter may be mounted on the filling machine, and the opening 5 may be provided with the opening knob 11 and the opening cut line 12 before filling the contents while rewinding the substrate 5.

  Next, the opening method of the easy-open packaging bag 1 of this invention is demonstrated using FIG. The opening knob 11 provided on the base 5 of the easy-open packaging bag 1 is picked with one finger, and the other base 5 of the unsealed part N provided on the upper edge thermal bonding part 7 with the other finger or not. When the upper edge thermal bonding portion 7 in the vicinity of the seal portion N is picked and opened toward the lower edge thermal bonding portion 7 ′ while pulling the opening knob 11 upward, the first cut 131 connected to the cut line 10 is opened. When the base 5 is torn from the rear end 13t and reaches the second cut 132, the opening direction is guided along the second cut 132, and the same is repeated sequentially, and the base 5 along the opening cut line 12 is repeated. Is torn to form a tear piece 14, and an opening 15 and contents (not shown) appear. When the opening cut line 12 reaches the side edge thermal bonding portion 6 and the tear piece 14 is further pulled, it peels between the opposing inner layers 4 along the side edge thermal bonding portion 6 to form a wide opening 15. Thus, the contents can be easily taken out. In addition, the substantially U-shaped partition wall thermal bonding portion 8 is also peeled between the inner layers 4 similarly to the side edge thermal bonding portion 6 and can be opened. A halftone dot portion in FIG. 4 indicates a peeling mark 8 ′ of the separated partition wall heat bonding portion 8. With such a structure, a wide opening can be formed, the contents can be easily taken out, and the contents can be taken out without soiling the back and palm of the hand even if the contents are reduced.

  FIG. 5 is a plan view showing a second embodiment of the easy-open packaging bag according to the present invention, and FIG. 6 is a cross-sectional view taken along line YY of FIG. The easy-open packaging bag 21 of the present invention comprises a front side sheet 22, a back side sheet 23 and a bottom sheet 24 provided with a base material layer 2, an intermediate layer 3, and an inner layer 4 made of a heat adhesive resin. The front side sheet 22 and the back side sheet 23 are arranged so that the four inner layers face each other, and a bottom sheet 24 that is mountain-folded at the center with the inner layer 4 side being outside is inserted between the lower parts of the front and back sides. While the inner layers 4 and 4 of the sheets 22 and 23 and the inner layer 4 surface of the bottom folded sheet 24 facing the inner layers 4 and the peripheral heat bonding portion 33 provided at the periphery between the surfaces are thermally bonded to form the bottom portion 25, the front and back sides This is a self-supporting easy-open packaging bag having a pair of opposite end edges of the sheets 22 and 23, a side edge thermal bonding portion 26 and an upper edge thermal bonding portion 27 on the edge facing the bottom 25. The peripheral thermal bonding portion 33 indicates the peripheral edge of the bottom portion 25 formed by thermal bonding, and is composed of an edge thermal bonding portion at the lower end of the bottom portion 25 and side edge thermal bonding portions at both ends, and side edge thermal bonding on both sides. The part is shared with the side edge thermal bonding part 26. A notch A of the substantially semicircular bottom sheet 24 is provided in the vicinity of the lower ends of both sides of the bottom sheet 24 folded in the center. In the notch A, the four inner layers of the front and back side sheets 22 and 23 face each other. Is directly heat bonded.

  A substantially U-shaped partition wall thermal bonding portion having a bent portion 29 that is thermally bonded so as to be peelable across the side edge thermal bonding portion 26 with respect to the edge thermal bonding portion at the lower end of the peripheral thermal bonding portion 33 on the bottom portion 25. 28 is provided, an unsealed portion N having a predetermined width is provided on the peripheral thermal bonding portion 33 facing the bent portion 29, and the bent portion 29 is straddled to the outer edge of the unsealed portion N from the partition thermal bonding portion 28 or the vicinity of the outer edge thereof. A cut line 30 penetrating the front and back side sheets 22 and 23 is formed on one or both of the front and back side sheets 22 and 23, and the bent portion 29 is formed at the outer edges of the respective cut lines 30 and 30 and the unsealed portion N. An opening picking portion 31 is provided. The cut line 30 may be partially provided with non-cuts that do not penetrate the front and back side sheets 22 and 23 to form pawls. Furthermore, the front and back side sheets 22, along the partition heat bonding portion 28 from the end of the opening knob 31 to the partition heat bonding portion 28 side of the break line 30 to the unsealed portion around the partition heat bonding portion 28 or its outer edge, An opening notch line 32 penetrating the front and back side sheets 22, 23 is provided on one or both of 23. Although not shown, for example, contents such as rice crackers and biscuits that are highly hygroscopic, such as confectionery, are surrounded by a side edge thermal adhesive portion 26, a partition thermal adhesive portion 28, and an upper edge thermal adhesive portion 27. In a closed area. Further, the bent portion 29 of the partition wall heat bonding portion 28 is provided with a mountain-shaped seal portion 29b having one or a plurality of protruding portions protruding to the edge heat bonding portion side at the lower end of the peripheral heat bonding portion 33. . With such a configuration, when picking the opening knob 31 and opening the easy-open packaging bag 21, it is possible to reduce the tensile force required at the initial stage of opening and pulling the opening knob 31. Thus, it can be easily peeled off from the bottom 25, and the opening can be started smoothly.

  The laminated structure of the front and back side sheets 22 and 23 and the bottom sheet 24 constituting the easy-open packaging bag 21 of the present invention and the structure of the opening part are the same as in the first embodiment, and the description thereof is omitted.

  Next, the manufacturing method of the easily openable packaging bag 21 is demonstrated. The front and back side sheets 22 and 23 and the bottom sheet 24 are printed on the surface of the base material layer 2 facing the intermediate layer 3 by a gravure printing method. Thereafter, the intermediate layer 3 and the inner layer 4 are sequentially laminated by a dry lamination method or an extrusion lamination method to produce a winding. The bottom sheet 24 is not normally printed, but can be provided according to customer requirements. Next, while unwinding the winding of the front and back side sheets 22 and 23 with a known standing pouch bag making machine, the base line 2, the intermediate layer 3, the cut line 30 and the cut 13 at predetermined positions according to the printing register. For example, it is formed using a rotary die cutter so as to penetrate to the inner layer 4, and is provided with an opening knob 31 and an opening cut line 32, and thereafter, the inner layer 4 surfaces of the front side sheet 22 and the back side sheet 23 are connected to each other. It is arranged so as to face each other, and a substantially semi-circular cutout is provided at a predetermined position of the bottom sheet 24 that is mountain-folded at the center with the inner layer 4 face outside between the lower parts of the front and back side sheets 22, 23. The peripheral layers between the inner layers 4 and 4 of the front and back side sheets 22 and 23 and the inner layer 4 of the bottom folded sheet 24 facing them are thermally bonded and are not attached to the edge thermal bonding portion at the lower end of the peripheral thermal bonding portion 33. Seal part N In addition to forming the bottom portion 25, a pair of opposite end edges of the front and back side sheets 22, 23 are thermally bonded to provide a side edge thermal bonding portion 26, and the notch portion of the front and back side sheets 22, 23 is provided. The inner layer 4 surfaces are directly heat-bonded to each other, and a self-supporting easy-open packaging bag with the upper end edge heat-bonding portion 27 not bonded is formed. Thereafter, the contents are filled from above with a filling machine for the contents, and the upper edge thermal bonding portion 27 is thermally bonded and sealed, whereby the easy-open packaging bag 21 is manufactured.

  Further, for example, a rotary die cutter is mounted on the filling machine, and the opening knob 11 and the opening cut line 12 are provided on one or both of the front and back side sheets 22 and 23 while rewinding the front and back side sheets 22 and 23. Thereafter, the contents can be filled.

  Moreover, although the opening picking part 11 and the opening cut line 12 can be provided on either one or both of the front and back side sheets 22 and 23, the opening side of the easily openable packaging bag 21 is provided on both. This is preferable because there is no need to make a selection and convenience is improved. The unsealing method is the same as in the first embodiment, and a description thereof is omitted.

  FIG. 7 is a plan view showing a third embodiment of the easy-open packaging bag according to the present invention. As shown in FIG. 7, the easy-open packaging bag 31 includes a bent portion of the partition thermal bonding portion, an opening cut line, a cut line forming an opening knob, and an edge thermal bond including the opening knob. Unlike the configuration of the first embodiment, the region surrounded by the portion, the side edge thermal bonding portion of the two sides and the partition thermal bonding portion is the same. The bent portion 39 of the substantially U-shaped partition wall thermal bonding portion 38 is provided with two throat-shaped seal portions 39c protruding to the unsealed portion N side provided on the opposed upper edge thermal bonding portion 37. Between the seal portions 39c, a curved seal portion 39d that is curved in a concave shape with respect to the upper edge thermal bonding portion 37 side is provided. With such a configuration, it is possible to further reduce the tensile force required at the initial stage of opening, and to smoothly start opening by pulling the opening knob 11. It suffices that at least one of the shed-like seal portions 39c is provided, and may be arbitrarily set depending on the size of the opening knob. The curved seal portion 39d may be linear, but the curved seal portion is preferable because the peel strength at the time of opening does not increase rapidly and can be opened smoothly.

  Further, the opening cut line 312 is formed by a half cut that does not penetrate the base body 5, and the partition heat bonding part is formed from the vicinity of both ends of the cut line 310 of the opening knob 11 to the partition heat bonding part 38 or an unsealed part around the outer edge thereof. 38 is provided on the base body 5. Furthermore, a tip 312h on the opening knob 11 side of the opening cut line 312 made of a half cut is formed in a U shape. Since the tip 312h on the side of the opening knob 11 is formed in a U shape, the base body 5 is torn from both ends of the cut line 310 of the opening knob 11 when opened from the opening knob 11, and the tearing is performed. When the direction is guided by the opening cut line 312, it is possible to prevent the base body 5 from tearing from the tip 312 h on the opening knob 11 side of the opening cut line 312 and deviating from the opening cut line 312. In addition, the front end of the cut line 310 on the opening cut line 312 side is a curve or a straight line toward the side edge thermal bonding portions 6, 6. Such a configuration is preferable because the tearing direction from the cut line 310 is easily guided to the opening cut line 312.

  Further, projecting seal portions 37a and 37a surrounding the opening knob 11 are provided from the vicinity of the unsealed portion N side of the upper edge thermal bonding portion 37 provided with the unsealed portion N. Furthermore, a substantially rectangular point seal portion P is provided in an unsealed region R surrounded by the upper edge thermal bonding portion 37, the side edge thermal bonding portions 6, 6, the partition thermal bonding portion 38, and the protruding seal portion 37a. . By providing the projecting seal portions 37a and 37a in this way, it is possible to reduce the entry of foreign matter from the cut line 310 of the opening knob 11 into the unsealed region R, and further to the point seal portion in the unsealed region R. By adopting a configuration in which P is provided, it is possible to further reduce the entry of foreign matter from the cut line 310 of the opening knob 11 into the unsealed region R. In the third embodiment, two point seal portions P are provided in each of the unsealed regions R and R, and the point seal portions P on both side edge thermal bonding portions 6 and 6 are opposed to the upper edge thermal bonding portion 37. The lower end edge of the position to be attached is elongated in the direction of the heat-bonding portion 7 ′. The number, size, shape, and the like of the point seal portion P are not limited to those in the third embodiment, and may be arbitrarily set depending on the size and shape of the unsealed region R.

  Further, the opening knob 11 is provided with a spot seal portion S around the cut lines 310 and 310 and the outer edge of the unsealed portion N. With such a configuration, the opening knob 11 is curled, or even if an external force is applied due to handling or impact during distribution or transportation, the opening knob 11 is rolled and accidentally pulled. It can be prevented from being damaged or opened. Note that the number, size, shape, formation position, and the like of the spot seal portion S can be appropriately provided in consideration of the laminated structure of the lid.

  FIG. 8 is a plan view showing a fourth embodiment of the easy-open packaging bag according to the present invention. As shown in FIG. 8, the easy-open packaging bag 41 includes a bent portion of the partition heat-bonding portion, an opening cut line, a cut line forming an opening knob, and an upper edge thermal bond including the opening knob. Unlike the configuration of the first embodiment, the region surrounded by the portion, the side edge thermal bonding portion on both sides, and the partition thermal bonding portion is the same. Furthermore, the easy-open packaging bag 41 is different from the third embodiment in the configuration of the opening cut line 412 and the others are the same. The opening cut line 412 of the easy-open packaging bag 41 extends from the vicinity of both ends of the cut line 310 of the opening knob 11 to the partition heat bonding part 38 or the unsealed part around the outer edge along the partition heat bonding part 38. The base 5 is provided. The opening cut line 412 is the same as the opening cut line 12 of the first embodiment except that the opening cut line 412 is composed of an intermittent cut 13 having a straight line portion 13a and a hatched portion 13b, and the configuration of the first cut 131 is different. The different parts will be described. A straight end 131'h of the first cut 131 'is formed in a U shape. With this configuration, the base 5 is torn from both ends of the cut line 310 of the opening knob 11 when opened from the opening knob 11, and the tear direction is guided to the opening cut line 412. In some cases, it is possible to prevent the base body 5 from tearing from the tip 131′h of the straight portion of the first cut 131 ′ and deviating from the opening cut line 412.

  Next, the present invention will be described in more detail with reference to the following examples.

  Predetermined printing is performed with a polyurethane-based ink on a 12 μm-thick biaxially stretched polyethylene terephthalate film (PET) by a gravure printing method, and a 15 μm-thick biaxially stretched nylon is applied to the printed surface via a polyester polyol-isocyanate adhesive. Dry lamination is performed on the corona-treated surface of an EPR film (manufactured by Tosero Chemical Co., Ltd., CMPS013C) having a film (ON) laminated by a dry lamination method and further subjected to a 30 μm-thick corona treatment on the ON surface via the adhesive. Then, the substrate 5 was laminated and cured at 40 ° C. for 2 days to prepare a winding of the substrate 5.

  The base 5 is wound by a bag making machine equipped with a punching die having a cutting blade and a face plate, and the side edge thermal bonding part 6 is 7 mm wide, the upper edge thermal bonding part 7 is 7 mm wide, Bulkhead thermal bonding provided with a chevron-shaped seal portion 9b provided with five protruding portions protruding 2.5 mm on the upper edge thermal bonding portion 7 side and a bent portion 9 having a straight portion 9a having a length of 30 mm at a substantially central portion. The portion 8 has a width of 7 mm, and further, a non-sealed portion N having a length of 30 mm is provided at a position facing the bent portion 9 on the upper edge thermal bonding portion 7, and the lower edge thermal bonding portion 7 ′ having an outer dimension of 170 mm × 135 mm. A four-side seal type easy-open packaging bag 1 in which no is formed was produced. Further, the cut line 10 is formed so as to straddle the bent portion 9 of the four-side seal type easy-open packaging bag and reach the outer edge of the unsealed portion N from substantially both ends thereof, and is surrounded by the cut line 10 and the outer edge of the unsealed portion N Opening knob 11 of 30 mm × height 20 mm is provided, and the rear end of the cut and the leading end of the next cut are formed by a straight portion 5 mm, a hatched portion 2.5 mm, and a 135 ° angle cut formed by the straight portion and the hatched portion. An opening line 12 for opening was provided at a position corresponding to the opening direction.

  Predetermined printing is performed on the corona-treated surface of a biaxially stretched polypropylene film (OPP) having a thickness of 20 μm with a polyurethane-based ink by a gravure printing method, and a polyester polyol-isocyanate-based adhesive is applied to the printed surface. EPR which was laminated by dry lamination method with aluminum vapor deposition surface of biaxially stretched polyethylene terephthalate film (PET) with single-sided aluminum vapor deposition of 12μm thickness, and further 30μm thick single-sided corona treatment via PET on the PET surface. A corona-treated surface of a film (manufactured by Tosero Chemical Co., Ltd., CMPS013C) was laminated by a dry lamination method and cured at 40 ° C. for 2 days to prepare a winding used for front and back side sheets.

  A biaxially stretched polyethylene terephthalate film (PET) having a thickness of 12 μm is dry-laminated on a corona-treated surface of a biaxially stretched polypropylene film (OPP) having a thickness of 20 μm and subjected to corona treatment on a single side via a polyester polyol-isocyanate adhesive. And a corona-treated surface of an EPR film (manufactured by Tosero Chemical Co., Ltd., CMPS013C) with a thickness of 30 μm on the PET surface via the adhesive, and laminated by a dry lamination method, Curing was carried out for 2 days to prepare a winding used for the bottom sheet.

  Using the above winding, the vertical and horizontal dimensions are 170 mm × 135 mm, the bottom folding dimension is 33 mm, the side edge thermal adhesive portion 26 and the peripheral thermal adhesive portion 33 have a seal width of 7 mm, and the length of the straight portion 29 a of the bent portion 29. A substantially U-shaped partition wall thermal bonding portion 28 having a bent portion extending from the position of 10 mm from the bottom lower end to the intersection of the mountain fold portion of the bottom sheet 24 and the side edge thermal bonding portion 26 is set to a seal width of 7 mm. Further, a self-standing easy-open packaging bag is made with the length of the unsealed portion N provided at a position facing the bent portion 29 at the lower end of the peripheral heat-bonding portion 33, and the bent portion 29 is straddled across the bent portion 29. Forming a cut line 30 reaching the outer edge of the unsealed portion N from substantially both ends of 28, and providing an opening knob 31 of length 30 mm × height 10 mm surrounded by the cut line 30 and the outer edge of the unsealed portion N; Straight section 5mm, A 135 mm angled cut formed by a hatched portion of 2.5 mm and a straight portion and a shaded portion is formed at a position where the rear end of the cut and the leading end of the next cut coincide with the opening direction, and an opening cut line 32 is provided. Thus, an easy-open packaging bag 21 was produced. The angle seal portion 29b of the bent portion 29 has five protruding portions that protrude 2.5 mm toward the edge heat bonding portion side at the lower end of the peripheral heat bonding portion 33.

  Using the winding of the substrate 5 of Example 1, the bag was made by a bag making machine equipped with a punching die provided with a cutting blade and a face plate, and the same size (length 30 mm × length) as in Example 1 An opening picking portion 11 having a height of 20 mm) was provided, and a four-side seal type easy-open packaging bag 31 of the same size was produced. However, two beak-shaped seal portions 39c are projected by 3.5 mm on the unsealed portion N side provided at the upper edge thermal bonding portion 37 at the bent portion 39 of the substantially U-shaped partition wall thermal bonding portion 38. A curved seal portion 39d is formed with a distance of 20 mm between them, and two point seal portions P are provided in each of the unsealed regions R and R. The tip of the opening cut line on the side of the opening cut line 312 is a curved line toward the side edge thermal bonding parts 6, 6, and the tip of the opening cut line on the side of the opening knob is U-shaped. It was formed in a shape and provided in the vicinity of the end portion on the partition wall heat-bonding portion side of the cut line. Further, a total of three spot seal portions were provided on the opening knob, one on each of the periphery of the cut line and the outer edge of the unsealed portion. The opening cut line consisting of a half cut was provided on the substrate 5 so as to penetrate the EPR film and the ON film from the EPR film surface to reach the PET film. In addition, a cut line 310 was formed, and the opening knob 11 surrounded by the cut line 310 and the outer edge of the unsealed part N was provided.

  Using the winding of the substrate 5 of Example 1, bag making is carried out by a bag making machine equipped with a punching die having a cutting blade and a face plate, and the same opening knob and cut line as in Example 3 and Example A four-side seal type easy-open packaging bag 41 having the same size as that of Example 1 was prepared by providing the same opening cut line as in Example 1. However, the tip 131'h of the straight portion of the first cut 131 'was formed in a U shape and provided in the vicinity of the end of the cut line on the side of the partition wall heat bonding portion. The configuration and dimensions of the opening cut line were the same as in Example 1, and the tip 131'h of the straight part of the first cut 131 'was formed in a U shape. The cut line of the opening knob, the cut-out seal portion of the bent portion, the curved seal portion, the point seal portion, and the spot seal portion have the same configuration as in the third embodiment.

  The easy-open packaging bags of Examples 1 and 2 prepared above were filled with 50 g of potato chips and sealed with the lower edge thermal adhesive portion 7 ′ and the upper edge thermal adhesive portion 27.

  Then, when each easy-open packaging bag was opened from the picking part for opening, the four-side seal type easy-open packaging bags of Examples 1, 3, and 4 were thermally bonded to the partition wall along the opening cut line. It was peeled off at the edge and the side edge thermal bonding part, and it could be opened, and the contents could be taken out. In the self-supporting easily openable packaging bag of Example 2, the front side sheet and the bottom sheet are peeled off at the partition wall heat bonding portion along the opening cut line, and the front side sheet is further peeled off at the side edge heat bonding portion. The back side sheet was peeled off and opened, and the contents could be taken out. A wide opening was formed in each of Examples 1 to 4, and the contents could be easily taken out without soiling the fingers even when the contents were reduced.

It is a top view which shows 1st embodiment of the easily openable packaging bag concerning this invention. It is the XX sectional view taken on the line of FIG. It is an enlarged view which shows the cut line and cut in the circle | round | yen of FIG. It is a perspective view which shows the state in the middle of opening of an easily openable packaging bag. It is a top view which shows 2nd embodiment of the easy-open packaging bag concerning this invention. FIG. 6 is a cross-sectional view taken along line YY in FIG. 5. It is a top view which shows 3rd embodiment of the easily openable packaging bag concerning this invention. It is a top view which shows 4th embodiment of the easily openable packaging bag concerning this invention.

Explanation of symbols

1, 21, 31, 41 Easy-open packaging bag 2 Base layer 3 Intermediate layer 4 Inner layer 5 Substrate 6, 26 Side edge thermal bonding part 7, 27, 37 Upper edge thermal bonding part 7 'Lower edge thermal bonding part 8 , 28, 38 Bulkhead heat-bonding part 8 'Peeling mark 9, 29, 39 Bending part 9a, 29a Straight line part 9b, 29b Mountain-shaped seal part 10, 30, 310 Cut line 11, 31 Opening knob 12, 32, 312 413 Opening line 13 Cutting line 13a Straight line part 13b Diagonal line part 13h Cutting edge 13t Cutting edge rear edge 131, 131 'First cutting line 132 Second cutting line 133 Third cutting line 14 Tear piece 15 Opening part 22 Front side Sheet 23 Back side sheet 24 Bottom sheet 25 Bottom 33 Peripheral heat bonding portion 37a Projection seal portion 39c Mouth-shaped seal portion 39d Curved seal portion 131'h First Tip of the cut line 312h Tip of the opening cut line side of the opening cut line A Notch part N Unsealed part P Point seal part R Unsealed area S Spot seal part

Claims (12)

A rectangular substrate having at least a base material layer and an inner layer made of a heat-adhesive resin, the inner layers are opposed to each other, and a side edge thermal bonding portion and a side edge heat are formed on a pair of opposite ends. A substantially U-shaped partition wall thermal bond having an edge thermal bonding portion at one edge orthogonal to the bonding portion and having a bent portion across the side edge thermal bonding portion with respect to the edge thermal bonding portion side A packaging bag that is thermally bonded so as to be peelable at the side edge thermal bonding portion and the partition thermal bonding portion, wherein an unsealed portion is provided at the edge thermal bonding portion, and the bent portion is A break line that penetrates through the base body that forms one surface is formed by reaching the outer edge of the unsealed portion from the partition thermal adhesive portion or the vicinity of the outer edge of the partition wall, and the bent portion is formed between the cut line and the unsealed portion. An opening knob is provided that is surrounded by the outer edge of the opening. The base constituting one surface along the partition heat-bonding portion from an end portion of each of the cut lines on the partition heat-bonding portion side or the vicinity thereof to the partition heat-bonding portion or an unsealed portion around the outer edge thereof An easy-to-open packaging bag characterized in that an opening cut line is provided, and the opening is picked from the opening knob along the opening cut line. It consists of a base layer and a front side sheet, at least a back side sheet and a bottom sheet provided with an inner layer made of a heat-adhesive resin, and the inner side surfaces of the front side sheet and the back side sheet are arranged to face each other, Inserting the bottom sheet folded in the center with the inner layer surface outside between the lower portions of the sheet, and the periphery between the inner layer surface of the front and back side sheets and the outer surface of the mountain folded bottom sheet facing them The bottom edge is formed by heat-bonding the peripheral heat-bonding portion provided on the side, and the edge heat-bonding portion is formed on the side edge heat-bonding portion and the edge opposite to the bottom portion on a pair of opposite ends of the front and back side sheets. In a self-supporting packaging bag comprising: a substantially U-shaped partition wall thermal bonding having a bent portion that is thermally bonded to the bottom portion so as to be peelable across the side edge thermal bonding portion with respect to the lower end side of the bottom portion Part is provided, and the bent part is opposed to An unsealed portion is provided at the edge thermal bonding portion, straddles the bent portion, reaches the outer edge of the unsealed portion from the partition thermal bonding portion or the vicinity of the outer edge thereof, and the front and back side sheets are provided on one or both of the front and back side sheets. Each of the cut lines is formed so as to be surrounded by the cut line and the outer edge of the unsealed part. The front and back side sheets are attached to either one or both of the front and back side sheets along the partition thermal adhesive part from the end of the partition thermal adhesive part side or the vicinity thereof to the unsealed part around the partition thermal adhesive part or the outer edge thereof. An easy-open packaging bag characterized by being provided with an opening cut line and opening along the opening cut line from the opening knob. The easily openable packaging bag according to claim 1 or 2, wherein the opening cut line is a half cut that does not penetrate the base body. The opening cut line consists of intermittent cuts, and the cut line extends from the rear end side with respect to the straight part extending in a direction parallel to the partition heat-bonding part and the opening knob part of the straight part. The partition thermal adhesive portion of the partition line of the opening knob, the tip of the first cut is formed by a diagonal portion extending obliquely at an obtuse angle with respect to the linear portion toward the side edge thermal adhesive portion The easily openable packaging bag according to claim 1, wherein the easily openable packaging bag is formed so as to be connected to an end portion on the side or in the vicinity thereof. The bent portion of the substantially heat-bonded partition wall thermal bonding portion has a straight portion of a predetermined length parallel to the edge thermal bonding portion or the bottom lower end, and the edge thermal bonding portion side is in the linear portion Alternatively, an easily openable packaging bag according to any one of claims 1 to 4, further comprising a mountain-shaped seal portion having one or a plurality of protruding portions protruding toward the bottom lower end side of the bottom portion. 2. The bent portion of the substantially U-shaped partition wall thermal bonding portion is provided with at least one lip-shaped seal portion protruding toward the edge thermal bonding portion side or the bottom lower end side. The easily openable packaging bag in any one of -4. The rear end of the cut of the opening cut line and the front end of the straight line of the next cut coincide with or at least overlap with the opening direction. The easy-open packaging bag according to any one of the above. The easy-open packaging according to any one of claims 3, 5 and 6, wherein a tip of the unsealing cut line formed of the half cut is formed in a U-shape. bag. The easily openable packaging bag according to any one of claims 4 to 7, wherein a tip of the straight portion of the first cut forming the opening cut line is formed in a U shape. A protruding seal portion surrounding the unsealing knob is provided in the vicinity of the unsealed portion of the peripheral heat-bonding portion facing the edge heat-bonding portion or the bent portion provided with the unsealed portion. The easily openable packaging bag in any one of Claims 1-9. An unsealed region surrounded by the edge thermal bonding portion, the side edge thermal bonding portion, the partition thermal bonding portion, and the protruding seal portion, or the peripheral thermal bonding portion, the partition thermal bonding portion, and the protruding seal. The easily openable packaging bag according to claim 1, wherein a point seal portion is provided in an unsealed region surrounded by the portion. The easy-open packaging bag according to any one of claims 1 to 11, wherein a spot seal portion is provided in the opening knob.

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