JP6359139B2 - Packaging bag and method for manufacturing packaging bag - Google Patents

Description

  The present invention relates to a packaging bag for packaging a triangular food and a method for manufacturing the packaging bag.

  Conventionally, a packaging bag for packaging a triangular food product has been provided (see, for example, Patent Document 1).

  Such a packaging bag includes a pair of sheets that overlap each other. Each of the pair of sheets is a pair of oblique sides having a first end and a second end opposite to the one end, and the pair of oblique sides that are separated from each other as they go from the first end side to the second end side And a first straight line portion extending across the first ends of the pair of oblique sides, and a second straight line portion provided at an interval from the first straight line portion. Each of the pair of sheets includes a sealing extension portion extending from a portion extending from the second end of one oblique side portion to the second end of the other oblique side portion. And one oblique side part of a pair of sheet | seat is joined, the other oblique side part is joined, 1st linear part is joined, 2nd linear part is joined.

  Furthermore, in one of the sheets, an opening knob formed by a notch penetrating in a plane orthogonal direction to a portion between the first linear portion and the second linear portion (hereinafter referred to as a holding portion), A tearing part capable of tearing the sheet by pulling the opening knob is formed.

  To package food using this type of packaging bag, after inserting the food between one sheet and the other sheet from the sealing extension part side, the sealing extension part of one sheet And the sealing extension of the other sheet are joined. Thereby, food is packaged by the packaging bag.

  And in order to open the packaging bag which has packaged food, one sheet | seat is torn by pulling so that the opening knob | pick part may be spaced apart from a holding | maintenance part, hold | maintaining a holding | maintenance part. By doing in this way, a packaging bag can be opened and the packaged food can be taken out.

JP 2005-35673 A

  By the way, in the above-mentioned packaging bag, when opening, it is necessary to pull the opening knob part away from the holding part while holding the holding part, so the opening knob part is pulled with an appropriate force. It may not be possible. In such a case, in the above-described packaging bag, when opening the package, the packaged food may be broken or an unexpected part may be torn.

  Then, this invention makes it a subject to provide the packaging bag which can be opened more reliably, and the manufacturing method of this packaging bag.

The packaging bag according to the present invention includes a pair of overlapping sheets, each of the pair of sheets being a pair of oblique sides having a first end and a second end opposite to the first end, the first end A sheet main body portion having a pair of oblique sides spaced apart from each other toward the second end side, and an unsealing start portion extending over the first ends of the pair of oblique sides, and an opening knob extending from the unsealing start portion Each of the sheets includes a pair of opposing sides extending from the first ends of the pair of oblique sides provided in each sheet, and the pair of opposing sides. The portion includes a portion extending from each first end of the pair of oblique sides while being separated from each other, and the oblique side portion of the sheet main body portion in one sheet and the oblique side portion of the sheet main body portion in the other sheet , Releasably joined, and the opening start point of one sheet The square sheet of unsealing start part, is releasably bonded.

  According to the packaging bag of the said structure, each of a pair of sheet | seat has an opening knob for extending from an opening starting point part. Therefore, when each of the pair of opening knobs is pulled in the opposite direction, the opening start point of one sheet and the opening start point of the other sheet are peeled off. Furthermore, when each of the pair of opening knobs is continuously pulled, one oblique side and the other oblique side are sequentially peeled from the first end side.

  In this way, the packaging bag can be opened by pulling the pair of opening tabs in opposite directions to separate one sheet from the other sheet. Therefore, it is easy to separate one sheet and the other sheet with an equal force.

  The method for manufacturing a packaging bag according to the present invention is the method for manufacturing a packaging bag for manufacturing the above-described packaging bag, which is a pair of long sheet bands, the first end and the first in the width direction orthogonal to the longitudinal direction. A pair of sheet strips having a second end opposite to the end are overlapped with each other while being extended, and a pair of linear joining regions extending from the first end and the second end of the pair of sheet strips can be peeled off. A pair of cutting margin sides that approach each other from one of the first end or the second end of the sheet band toward the other end of the first end or the second end, and the cutting margin side. Forming a pair of oblique side joints extending from one of the parts to the other side of the first end or the second end of the sheet band and spaced apart from each other, in the packaging bag forming part defined by the pair of joining regions, From the boundary between one cutting edge and one hypotenuse Packaging by forming a starting joint by releasably joining the unsealing starting points across the boundary between the other cutting margin and the other oblique joint, and cutting the sheet band along the joining region The bag forming part is separated from the sheet belt, and at least a part of the cutting margin side part of the packaging bag forming part separated from each of the pair of sheet belts is separated from the packaging bag forming part, and each opening start point part of the pair of sheets An opening knob extending from the surface is formed.

  According to the manufacturing method of the packaging bag of the said structure, a pair of opening knob | pick part is formed by cut | disconnecting a cutting margin side part from a packaging bag formation part. Therefore, even if a pair of linear joining regions extending between the first end and the second end of the pair of sheet bands are detachably joined, a pair of opening knobs that are separated from each other can be formed. it can.

  In this case, the pair of linear joining regions extending from the first end of the sheet band to the second end are joined to each other in a peelable manner, so that the first end of the sheet band or the first of the pair of oblique side joints can be separated. A pair of escape sides that extend toward one of the two ends and approach each other are further formed, on the upstream side in the sheet belt feeding direction with respect to the packaging forming portion formed at the tip of the adjacent packaging bag forming portion. When forming a new adjacent packaging bag forming portion, the cutting margin side portion is adjacent to the escape side portion of the previously formed packaging bag forming portion, and the oblique side joint portion of the previously formed packaging bag forming portion. The pair of sheets are spaced apart from the pair of joining regions joined in advance, with the oblique side joining part adjacent to each other and the escape side part adjacent to the cutting margin side part of the previously formed packaging bag forming part. Separate linear joining areas extending from the first end of each band to the second end can be peeled It may be joined. If it does in this way, a plurality of packaging bag formation parts can be formed side by side without a gap along the longitudinal direction of a sheet belt. Therefore, a packaging bag can be manufactured efficiently.

  By separating the escape side part of the packaging bag forming part separated from each of the pair of sheet belts from the packaging bag forming part, from the open part over each second end of the pair of oblique side parts of the sheet main body part An extending portion for sealing that extends may be formed. If it does in this way, even if it joins so that a pair of linear joining area | region covering each 1st end and 2nd end of a pair of sheet | seat strips may be peeled, it will become a pair of sealing extension which mutually spaces apart The part can be formed.

  As mentioned above, according to the packaging bag which concerns on this invention, it can open more reliably. Moreover, according to the manufacturing method of the packaging bag which concerns on this invention, the outstanding effect that the packaging bag which can be opened more reliably can be produced can be show | played.

FIG. 1 is a front view of a packaging bag according to an embodiment of the present invention. FIG. 2 is an exploded perspective view of the packaging bag according to the embodiment. FIG. 3 is a perspective view of the packaging bag according to the embodiment, and is a perspective view of a state in which food is packaged. FIG. 4 is an explanatory view of the method for opening the packaging bag according to the embodiment, and is an explanatory view showing a state in which the pair of opening knobs are pulled in opposite directions. FIG. 5 is an explanatory view of the method for opening the packaging bag according to the embodiment, and is an explanatory view showing a state in which the starting point joining portion and the oblique side joining portion are torn. FIG. 6 is an explanatory diagram of a method of opening the packaging bag according to the embodiment, and is an explanatory diagram of a state where the tear of the hypotenuse separation part has reached the debonding part. FIG. 7 is an explanatory diagram of a method for manufacturing a packaging bag according to the embodiment, FIG. 7A is an explanatory diagram of a process of forming a plurality of packaging bag forming portions on a sheet belt, and FIG. 7B is a sheet belt It is explanatory drawing of the process in which the packaging bag formation part cut away from is shape | molded. FIG. 8 is a front view of a packaging bag formed by the packaging bag manufacturing method according to another embodiment of the present invention. FIG. 9 is a front view of a packaging bag formed by the packaging bag manufacturing method according to another embodiment of the present invention.

  Hereinafter, a packaging bag according to an embodiment of the present invention will be described with reference to the accompanying drawings. As shown in FIG.1 and FIG.2, the packaging bag 1 which concerns on this embodiment is provided with a pair of sheet | seats 2 and 2 which overlap.

  Each of the pair of sheets 2 and 2 is a pair of oblique sides 200 and 200 having a first end and a second end opposite to the first end, and from the first end side to the second end side. A sheet main body 20 having a pair of oblique sides 200, 200 spaced apart from each other and an opening start point 201 extending across the first ends of the pair of oblique sides 200, 200, and an opening knob extending from the opening start point 201 Part 21. In addition, each of the pair of sheets 2 extends from an open portion (not numbered) over the second ends of the pair of oblique sides 200, 200 of the sheet main body portion 20 (opening start point of the sheet main body portion 20). A sealing extension 22 extending from a portion opposite to the portion 201 is provided.

  In the present embodiment, the following description will be given with the direction in which the pair of oblique sides 200 and 200 are arranged as the width direction and the direction orthogonal to the width direction as the longitudinal direction.

  The oblique side portion 200 of the sheet main body portion 20 in one sheet 2 and the oblique side portion 200 of the sheet main body portion 20 in the other sheet 2 are detachably joined. The unsealing start point 201 of the sheet main body 20 in one sheet 2 and the unsealing start point 201 of the sheet main body 20 in the other sheet 2 are detachably joined. In the present embodiment, a portion where the oblique side portion 200 of the sheet main body portion 20 in one sheet 2 and the oblique side portion 200 of the sheet main body portion 20 in the other sheet 2 are joined is referred to as an oblique side joint portion 200a. The following description will be made with a portion where the unsealing start point portion 201 of the sheet main body portion 20 and the unsealing start point portion 201 of the sheet main body portion 20 of the other sheet 2 are joined as a starting point joint portion 201a.

  The sheet main body 20 further includes a diagonal portion 200 of one sheet 2 joined to each other and a peeling portion 202 that prevents the other sheet 2 from being peeled off. The peeling portion 202 is formed in each of the pair of oblique side joint portions 200a. More specifically, the peeling portion 202 is provided from one sheet 2 to the other sheet 2 across the oblique side portion 200. In addition, the peeled portion 202 formed on one oblique side joint portion 200a and the peeled portion 202 formed on the other oblique side joint portion 200a have a width direction (one oblique side portion 200 and the other oblique side portion. In the direction in which 200 is aligned).

  Each of the pair of opening knobs 21 and 21 has a rectangular shape. More specifically, each of the pair of opening knobs 21 and 21 has a pair of opposing side portions 210 and 210 extending from the first ends of the pair of oblique sides 200 and 200, respectively. Each of the pair of opposed side portions 210 and 210 extends straight from the first end of the oblique side portion 200. That is, each of the pair of opposed side portions 210 and 210 extends so as to be parallel to each other.

  Each of the pair of sealing extending portions 22, 22 is a portion opposite to the unsealing start point portion 201 of the sheet main body portion 20 (from the second end of one oblique side portion 200 to the second end of the other oblique side portion 200. The dimension in the width direction is made smaller as it extends from the portion extending over. More specifically, each of the pair of sealing extending portions 22, 22 has a pair of sealing side portions 220, 220 extending from the pair of oblique sides 200, 200. And each of a pair of sealing edge parts 220 and 220 comes to mutually approach as it extends from the oblique edge part 200.

  The packaging bag 1 according to the present embodiment is as described above. Then, the packaging method of the foodstuff by the packaging bag 1 and the opening method of the packaging bag 1 which is packaging the foodstuff are demonstrated, referring an accompanying drawing.

  First, the food to be packaged in this embodiment will be described. As shown in FIG. 3, the food F has a triangular shape having a thickness. More specifically, the food F includes a triangular upper surface Fa, a lower surface opposite to the upper surface Fa, a triangular lower surface Fb, and a side surface Fc between the upper surface Fa and the lower surface Fb. Have

  In order to package the food F in the packaging bag 1, the sealing extension 22 of one sheet 2 and the sealing extension 22 of the other sheet 2 are separated from each other. In this state, the food F is inserted between the sheet main body 20 of one sheet 2 and the sheet main body 20 of the other sheet 2. And the food F is packaged by the packaging bag 1 by joining the sealing extension part 22 of one sheet 2 and the sealing extension part 22 of the other sheet 2.

  In such a state, one oblique side joint portion 200a of the packaging bag 1 is located at a location corresponding to the upper surface Fa of the food F, and the other oblique side joint portion 200a of the packaging bag 1 corresponds to the lower surface Fb of the food F. It will be in the state where it is located.

  And in order to open the packaging bag 1 which has packaged the food F, as shown in FIG. 4, the opening knob | pick part 21 of one sheet | seat 2 and the opening knob | pick part 21 of the other sheet | seat 2 mutually conflict. Pull in the direction you want. If it does in this way, the starting point junction part 201a will be torn (the unsealing origin part 201 of the one sheet | seat 2 and the unsealing origin part 201 of the other sheet | seat 2 will peel).

  Further, when the opening knob 21 is continuously pulled, as shown in FIG. 5, each of the pair of oblique side joints 200a and 200a is sequentially peeled off from the starting joint part 201a side (the oblique side part 200 of one sheet 2). The joint with the oblique side portion 200 of the other sheet 2 is peeled in order from the first end side). Then, as shown in FIG. 6, when each of the pair of oblique side joint portions 200 a and 200 a is peeled off to the portion where the separation portion 202 is provided, the pair of oblique side joint portions 200 a and 200 a is separated by the separation portion 202. Each peeling of is prevented. Thus, by separating the one sheet 2 and the other sheet 2, the packaged food F can be taken out.

  The packaging method of the food F by the packaging bag 1 according to the present embodiment and the opening method of the packaging bag 1 packaging the food F are as described above. Subsequently, the manufacturing method of the packaging bag 1 according to the present embodiment will be described with reference to the attached drawings.

  In the manufacturing method of the package, as shown in FIGS. 7A and 7B, a pair of long sheet strips 3 and 3, which are opposite to the first end and the first end in the width direction orthogonal to the longitudinal direction. A pair of sheet bands 3 and 3 having a second end are overlapped with each other while being fed out. And the some packaging bag formation part 31,31 ... is formed so that it may rank with the longitudinal direction of the sheet | seat band 3. FIG.

  More specifically, as shown in FIG. 7A, a pair of linear joining regions 30, 30 extending between the first end and the second end of the pair of sheet strips 3, 3 are detachably joined. By doing so, a pair of cutting margins 300, 300 that approach each other as they go from either one of the first end or the second end of the sheet band 3 to the other end of the first end or the second end, and a pair A pair of oblique side joints 200a, 200a that extend from either of the cut marginal side portions 300, 300 to either the first end or the second end of the sheet band 3 and are separated from each other are formed.

  At this time, either the first end or the second end of the sheet band 3 from each of the pair of oblique side joints 200a and 200a together with the pair of cut margin side parts 300 and 300 and the pair of oblique side joints 200a and 200a. A pair of missed side portions 301 and 301 that extend toward each other and approach each other are further formed. Thereby, the packaging bag formation part 31 demarcated by a pair of said joining area | regions 30 and 30 is formed.

  And in the packaging bag formation part 31 demarcated by a pair of said joining area | regions 30 and 30, the other cutting edge part 300 and the other hypotenuse from the boundary of one cutting edge part 300 and one oblique side joining part 200a The opening starting point portion 201 is formed by joining the portions extending along the boundary with the joint portion 200a so as to be peelable.

  Next, a new packaging bag forming portion 31 adjacent to the previously formed packaging bag forming portion 31 on the upstream side in the feeding direction of the sheet band 3 is formed. More specifically, a pair of oblique side joint portions 200a, 200a is formed by joining a pair of linear joining regions 30, 30 extending from the first end to the second end of the sheet band 3 in a peelable manner. A pair of escape side portions 301 and 301 are further formed that extend from either of the first and second ends of the sheet band 3 toward each other while approaching each other. At this time, when forming a new packaging bag forming portion 31 adjacent to the packaging forming portion 31 formed at the tip of the adjacent packaging bag forming portion 31 on the upstream side in the feeding direction of the sheet band 3, it is formed first. The cut edge portion 300 is adjacent to the missed side portion 301 of the packaging bag forming portion 31, and the oblique side joint portion 200 a is adjacent to the oblique side joint portion 200 a of the previously formed packaging bag forming portion 31. Each of the pair of sheet bands 3 and 3 is spaced apart from the pair of joining regions 30 and 30 previously joined so that the escape side 301 is adjacent to the cutting margin side 300 of the packaging bag forming part 31. A pair of linear joining regions 30, 30 extending from the first end to the second end are joined to each other in a peelable manner.

  Thereby, the new packaging bag formation part 31 demarcated by said pair of joining area | regions 30 and 30 is formed. And in the packaging bag formation part 31 demarcated by a pair of said joining area | regions 30 and 30, the other cutting edge part 300 and the other hypotenuse from the boundary of one cutting edge part 300 and one oblique side joining part 200a The opening starting point portion 201 is formed by joining the portions extending along the boundary with the joint portion 200a so as to be peelable.

  Then, the packaging bag forming part 31 is separated from the sheet band 3 by thermally fusing the sheet band 3 along the boundary between the adjacent packaging bag forming parts 31 and 31 (along the joining region 30). Thereby, the packaging bag forming part 31 is separated from the sheet band 3.

  After this, as shown in FIG. 7B, the intermediate positions of the pair of oblique side joints 200a and 200a are thermally fused to form the peeled portion 202. Then, the cutting margin side portion 300 of the packaging bag forming portion 31 separated from the sheet band 3 is separated from the packaging bag forming portion 31. Thereby, a pair of opening knobs 21 and 21 extending from the opening start point 201 of each of the pair of sheet main body portions 20 and 20 are formed.

  Further, by separating the escape side portion 301 of the packaging bag forming portion 31 separated from the sheet band 3 from the packaging bag forming portion 31, the opening starting point portion 201 of each of the pair of sheet main body portions 20 and 20 is opposite. A pair of sealing extending portions 22, 22 extending from the side portion (the portion extending from the second end of one oblique side portion 200 to the second end of the other oblique side portion 200) is formed. In the manufacturing method of the packaging bag 1, the packaging bag 1 is manufactured in this way.

  As described above, in the packaging bag 1, the unsealing knob portion in which each of the pair of sheets 2 extends from the unsealing starting point portion 201 over the first ends of the pair of oblique sides 200, 200 of the sheet main body portion 20. 21 is provided, it is easy to apply a substantially equal force to one sheet 2 and the other sheet 2. Therefore, in the packaging bag 1, each of the pair of oblique side joints 200 a and 200 a can be torn in order from the first end side. Therefore, the packaging bag 1 can have an excellent effect that it can be opened more reliably.

  Moreover, in the packaging bag 1 which concerns on this embodiment, as for each of a pair of sheet main-body parts 20 and 20, the peeling part 202 is formed in each of a pair of oblique side junction parts 200a and 200a. Therefore, the packaging bag 1 can prevent the oblique side joint portion 200a from being torn at the same time over the entire length.

  Further, in the packaging bag 1, since each of the pair of sheets 2 and 2 includes the sealing extension 22 that is separated from each other, in order to wrap the food between the pair of sheets 2 and 2, When the space is formed between the pair of sheets 2 and 2, it is possible to prevent the oblique side joint portion 200 a from being torn.

  And in the manufacturing method of the packaging bag 1, the cutting edge part 300 is formed in the both sides of the part in which the opening knob | pick part 21 of the sheet | seat band 3 is formed, and this cutting edge part 300 is cut off from the packaging bag formation part 31. Thus, the opening knob 21 is formed. Therefore, in the manufacturing method of the packaging bag 1, even if it joins a pair of linear joining area | regions 30 and 30 ranging over each 1st end and 2nd end of a pair of sheet strips 3 and 3 so that peeling is possible, The packaging bag 1 provided with a pair of opening knobs 21 and 21 that are separated from each other can be manufactured.

  Furthermore, in the manufacturing method of the packaging bag 1, by joining a pair of linear joining area | regions 30 over each 1st end and 2nd end of a pair of sheet | seat strips 3 and 3 so that peeling is possible, a pair of Since the pair of escape side portions 301, 301 are formed in addition to the oblique side joint portions 200a, 200a and the pair of cut margin side portions 300, 300, the plurality of packaging bag forming portions 31, 31. It can form without a gap along the longitudinal direction. Therefore, in the manufacturing method of the packaging bag 1, a packaging material can be manufactured efficiently.

  It should be noted that the packaging bag and the method for manufacturing the packaging bag according to the present invention are not limited to the above-described embodiments, and it is needless to say that various modifications can be made without departing from the gist of the present invention.

  In the above embodiment, each of the opposing side portions 210 and 210 of the opening knob 21 extends straight from the first end of the oblique side portion 200. However, the present invention is not limited to this. For example, the opposing side portion Each of 210 and 210 may be bent at an intermediate position in a direction extending from the first end of the hypotenuse part 200.

  More specifically, as shown in FIG. 8, each of the opposing side portions 210 and 210 is continuous with a portion formed so as to extend from the first end of the oblique side portion 200 while being separated from each other. A configuration in which a portion extending so as to be parallel is adopted, or as shown in FIG. 9, it is continuous with a portion formed so as to extend from the first end of the oblique side portion 200 while being separated from each other. Thus, it is possible to adopt a configuration in which portions extending while approaching each other are formed.

  Moreover, in the said embodiment, in the manufacturing method of the packaging bag 1, after forming the cutting margin side part 300, the oblique side junction part 200a, and the escape side part 301 in the sheet | seat band 3, the origin junction part 201a is formed. However, the present invention is not limited to this. For example, before forming the cutting margin side portion 300, the oblique side joint portion 200a, and the escape side portion 301, the starting point joint portion 201a is formed, or the sheet is formed. In addition to forming the cutting margin side portion 300, the oblique side joint portion 200a, and the escape side portion 301 in the band 3, the starting point joint portion 201a can be formed.

  Although not particularly mentioned in the above embodiment, the peeling portion 202 can be applied to the peeling portion 202 by applying a stronger force after preventing the pair of oblique side joint portions 200a and 200a from being peeled apart. Can be broken so that the pair of oblique side joints 200a, 200a can be further peeled apart.

  Moreover, in the said embodiment, although the cutting edge part 300 was cut | disconnected from the packaging bag formation part 31 ahead of the missed edge part 301, it is not limited to this, For example, the cutting edge part 300 The missed side 301 may be separated from the packaging bag forming part 31 after the packaging bag forming part 31, or may be separated from the packaging bag forming part 31 together with the missed side part 301.

  Moreover, in the said embodiment, in cutting the cutting margin part 300 from the packaging bag formation part 31, as shown to FIG. 7B, the packaging bag formation part 31 is taken from the part where the opening origin part 201 and the cutting margin part 300 cross. Although it cut | disconnected straight along the width direction of the sheet | seat band 3, it is not limited to this, For example, as shown in FIG. From the middle position in the direction extending from the unsealing start point portion 201 of the cutting margin side portion 300, it is cut straight along the width direction of the sheet band 3, or as shown in FIG. Then, the cutting margin side portion 300 may be separated from the packaging bag forming portion 31 by cutting along the direction intersecting the width direction of the sheet band 3.

  DESCRIPTION OF SYMBOLS 1 ... Packaging bag, 2 ... Sheet | seat, 20 ... Sheet | seat main-body part, 200 ... Oblique side part, 200a ... Oblique side junction part, 201 ... Opening origin part, 201a ... Origin point junction part, 202 ... Detaching part, 21 ... Opening knob , 210 ... Opposite side part, 22 ... Extension part for sealing, 220 ... Sealing side part, 3 ... Sheet band, 30 ... Joining region, 300 ... Cut edge part, 301 ... Misuse side part, 31 ... Packaging Bag forming part, F ... food, Fa ... upper surface, Fb ... lower surface, Fc ... side surface

Claims (4)

A pair of overlapping sheets is provided, and each of the pair of sheets is a pair of oblique sides having a first end and a second end opposite to the first end, from the first end side to the second end side. A pair of oblique sides spaced apart from each other, a sheet body portion having an opening start point extending across the first ends of the pair of oblique sides, and an opening knob extending from the opening start point ,
The opening knob included in each sheet includes a pair of opposite sides extending from the first ends of the pair of oblique sides included in each sheet,
The pair of opposed sides includes a portion extending from each first end of the pair of oblique sides while being separated from each other,
The oblique side part of the sheet main body part of one sheet and the oblique side part of the sheet main body part of the other sheet are detachably joined, and the opening starting point part of one sheet and the opening starting point part of the other sheet can be separated. Packaging bag joined to.   The manufacturing method of the packaging bag which manufactures the packaging bag of Claim 1, Comprising: It is a pair of elongate sheet | seat strip | belt, Comprising: The 1st end opposite to the 1st end and 1st end in the width direction orthogonal to a longitudinal direction A pair of sheet bands having two ends are overlapped with each other while being fed, and a pair of linear bonding regions extending between the first end and the second end of each of the pair of sheet bands are detachably bonded to each other. A pair of cut margins approaching each other from either the first end or the second end of the strip toward the other end of the first end or the second end, and the sheet strip from each of the cut margin sides A pair of oblique side joints extending to the other side of the first end or the second end and spaced apart from each other, and one cutting margin in the packaging bag forming part defined by the pair of joint regions; From the boundary with one hypotenuse joint, the other cut edge and the other Forming the starting point joining part by releasably joining the opening starting point parts across the boundary with the side joining part, cutting the sheet bag along the joining region, and separating the packaging bag forming part from the sheet band, An opening knob for separating at least a part of the cutting margin side portion of the packaging bag forming portion separated from each of the pair of sheet belts from the opening start point portion of the pair of sheets by separating from the packaging bag forming portion. A method of manufacturing a packaging bag to be formed.   By joining the pair of linear joining regions extending from the first end of the sheet band to the second end so as to be peelable, the first end or the second end of the sheet band from each of the pair of oblique side joining portions. A pair of escape sides that extend toward one of the other sides and approach each other are further formed, and adjacent to the packaging forming portion formed at the end of the adjacent packaging bag forming portion on the upstream side in the sheet belt feeding direction. When forming a packaging bag forming part, the cutting edge side is adjacent to the missed side part of the previously formed packaging bag forming part, and the hypotenuse is joined to the oblique side joining part of the previously formed packaging bag forming part. Each of the pair of sheet strips spaced apart from the pair of joining regions joined in advance so that the escape side is adjacent to the cutting margin side part of the packaging bag forming part formed previously. A pair of linear joining regions extending from the first end to the second end of the two are joined so as to be peelable. Method for producing a packaging bag according to claim 2.   By separating the escape side part of the packaging bag forming part separated from each of the pair of sheet belts from the packaging bag forming part, from the open part over each second end of the pair of oblique side parts of the sheet main body part The manufacturing method of the packaging bag of Claim 3 which forms the extension part for sealing which extends.

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