JP2006176166A - Packaging bag and unsealing structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide the unsealing structure of a packaging bag, which allows easy unsealing of the packaging bag by a tearing operation and easy resealing operation after the unsealing operation, and has gas permeability. <P>SOLUTION: The unsealing structure of the packaging bag made of a film material includes an unsealing part which can be unsealed by a tearing operation in one direction. At the unsealing part, the film material and a tape-like cloth are superposed on each other to form a sealing strip, where the cloth and at least a film material facing the cloth are welded together along the longitudinal direction of the cloth in a strip form. The sealing strip consists of a sealing strip A, which is formed by welding together the cloth and the film material facing the cloth along the longitudinal direction of the cloth in a strip form, and a sealing strip B, which is formed by welding the cloth and a pair of film materials together in a strip form and is spaced in parallel with the sealing strip A on the opposite side of a storage part, is formed. A gas permeating part is formed on the film material part facing the cloth between the sealing strips A, B. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a packaging bag and an opening structure that can be opened by tearing. Further, the present invention relates to a packaging bag and an opening structure having air permeability.

  Sealed packaging bags that can be opened by tearing are widely used in various applications. (For example, refer to Patent Document 1.) However, if the contents remain in the bag after opening and the bag is to be closed, a sealing tool such as a clip, a clothespin or a rubber band is required, and the closing operation is troublesome. Take it.

  Also, there is a chuck tape that is provided with a chuck tape and the bag is closed with the chuck tape after tearing and opening (see, for example, Patent Document 2). However, the manufacturing cost is high and the use is limited.

  On the other hand, sealed packaging bags are suitable for packaging of foods that dislike moisture, such as confectionery, but are not suitable for packaging of items such as cereals that affect quality and excessively increased internal pressure when completely sealed, such as rice. In some cases, air permeability after sealing is required.

As a method for imparting air permeability to the sealed packaging bag, the films of the packaging bag body are intermittently sealed to leave a non-sealed portion (see, for example, Patent Document 3). A part of the wall is made of a breathable sheet such as a nonwoven fabric (see, for example, Patent Document 4).
Forming vent holes such as cuts and holes in a plastic film bag (for example, see Patent Document 5) is disclosed.

  In the aspect of intermittently sealing the films, the width of the non-sealed part greatly affects the air permeability. If the width of the non-seal portion is large, it is relatively easy to manufacture, but if the content is granular, there is a risk of leakage from there. There is also a risk that foreign matter may enter the bag. On the other hand, if the non-seal portion is made small, the size of the non-seal portion is affected by the conditions of the fusion process, and it is difficult to form a predetermined value for obtaining a predetermined air permeability. If a vent is formed in the bag, the strength of the film at that portion may be reduced.

Even in the method using a breathable sheet such as cloth, the conventional method still has a problem that it takes time and effort to close the bag after opening.
Japanese Patent Laid-Open No. 5-42951 JP 2003-246332 A JP 2000-142729 A JP-A-11-334746 Japanese Patent Application Laid-Open No. 11-91804

  An object of the present invention is to provide a packaging bag opening structure that is easy to open by tearing and that can be easily reclosed after opening.

  An object of the present invention is to provide a packaging bag opening structure that is easy to open by tearing, easy to reclose after opening, and has air permeability.

The gist of the present invention is that the main body is formed of a film, and has a pair of sheet portions that respectively constitute a front portion and a back portion, and is provided in a packaging bag having a storage portion for storing contents. An unsealing structure including an unsealing part to be unsealed by tearing in the direction,
The sheet portion and the tape-like material are overlapped at the opening portion, and the tape-like material and at least the sheet portion facing the cloth among the pair of sheet portions are formed in a band shape along the longitudinal direction of the cloth. A fused sealing band is formed,
The tape-like material has an opening structure that is a tape-like cloth.

  In the opening structure, at one end of the sealing band, the cloth extending in the width direction of the sealing band, and the sheet part facing at least the cloth among the pair of sheet parts, , A fused portion can be formed.

Further, the gist of the present invention is that the main body is formed of a film, and has a pair of sheet portions each constituting a front portion and a back portion, and is provided in a packaging bag having a storage portion for storing contents. , An unsealing structure including an unsealing part to be unsealed by tearing in one direction,
In the opening part,
A sealing band A is formed in which a tape-shaped object and the sheet portion facing the tape-shaped object are fused in a band shape along the longitudinal direction of the tape-shaped object,
Opening in which a sealing band B is formed in which the tape-like material and the pair of sheet portions are fused in a band shape and spaced in parallel to the sealing band A and arranged in parallel on the opposite side of the storage portion It is in the structure.

  The tape-like material may be a tape-like cloth.

In the opening structure, the cloth has air permeability, and a sealing band A is formed in which the cloth and the sheet portion facing the cloth are fused in a band shape along the longitudinal direction of the cloth. ,
The cloth and the pair of sheet parts are fused in a band shape, and a sealing band B arranged in parallel to the opposite side of the storage part at an interval from the sealing band A is formed,
A ventilation portion selected from a cut, a hole, and a gap may be formed in a portion between the sealing band A and the sealing band B of the sheet portion facing the cloth.

In the opening structure, the cloth has air permeability, and a sealing band A is formed in which the cloth and the sheet portion facing the cloth are fused in a band shape along the longitudinal direction of the cloth. ,
The cloth and the sheet portion facing the cloth are fused in a band shape, and a sealing band C is formed which is arranged in parallel to the opposite side of the storage part at a distance from the sealing band A,
The pair of sheet portions are fused together in a band shape, and a sealing band D is formed in parallel to the opposite side of the sealing band A with a space from the sealing band C. A vent portion selected from a cut, a hole, and a gap may be formed in a portion of the sheet portion between the sealing band A and the sealing band C.

  The distance between the sealing band A and the sealing band B or the distance between the sealing band A and the sealing band C is 0.5 to 4 mm at least at one end of the sealing band A. It can be.

  The distance between the sealing band A and the sealing band B or the distance between the sealing band A and the sealing band C is determined from the one end of the sealing band A to the other end. Can spread in the direction.

  The other end of the sealing band A extends in the width direction of the sealing band A, and the sheet portion that faces at least the tape-shaped member of the pair of sheet portions. As a result, a fused portion can be formed.

  In the opening structure, the tape-like material may be superimposed on the sheet portion with one end portion of the tape-like material protruding from an edge of the sheet portion.

  The tape-like material may be a tape-like nonwoven fabric.

  Furthermore, the gist of the present invention is that the main body is formed of a film, and has a pair of sheet portions each constituting a front portion and a back portion, and a storage portion for storing contents, and the opening structure, It is in a packaging bag provided with the opening edge part sealed after the contents are accommodated.

  According to the present invention, a packaging bag opening structure that is easy to open by tearing is provided.

  According to the present invention, there is provided a packaging bag opening structure that is easy to open by tearing and easy to reclose after opening.

According to the present invention, there is provided a packaging bag opening structure that is easy to open by tearing, easy to reclose after opening, and has air permeability.

  Embodiments of the present invention will be described with reference to the drawings. In addition, in this specification, the same code | symbol written over each figure shows the same or similar member and thing. In the most preferred embodiment of the present invention shown in FIG. 1, the main body of the packaging bag 2 having the storage portion 5 for storing the contents is composed of a pair of sheet portions 4, 4 'facing each other. The sheet parts 4 and 4 'constitute the front part and the back part of the packaging bag 2, respectively. Or a back part and a front part are constituted, respectively. The opening structure 1 of the present invention is provided in a packaging bag 2. The opening structure 1 has the opening part 6 opened. Although the opening part 6 is located in the upper edge part of the packaging bag 2, as long as the content can be taken out by opening, it may be arrange | positioned in the position different from an upper edge part. Each of the sheet portions 4 and 4 'is made of a film-like resin. Usually, the sheet portions 4 and 4' are connected to each other in a tubular shape, and are composed of a tubular film as a whole, and are sealed at the bottom portion 16. Yes. The overall configuration of the sheet portions 4 and 4 ′ may be a bag-like structure in which a pair of single-leaf films facing each other are bonded and sealed at the edges.

  In the opening part 6, a tape-like cloth 8 is superimposed on the outer surface of the packaging bag 2 of the sheet part 4. The cloth 8 is arranged along the upper edge of the packaging bag 2 in parallel with the longitudinal direction of the upper edge. Further, in the opening portion 6, a sealing band A is formed in which the sheet portion 4 and the cloth 8 are fused in a band shape along the longitudinal direction of the cloth 8. Further, a sealing band B is formed in which the cloth 8 and the pair of sheet portions 4 and 4 ′ are fused in a band shape. The sealing band B is arranged in parallel to the sealing band A on the opposite side of the storage portion 5 with a space from the sealing band A.

  A ventilation portion 16 including a slit 14 is formed in a portion 15 between the sealing band A and the sealing band B of the sheet portion 4 facing the cloth 8. 2 and 3 show the mode of the cut 14.

  The vent 16 may be a hole formed in the portion 15. It may be a slit-shaped gap.

  The sealing band A is torn from one end 19 toward the other end 18. At the other end portion 18, a fusion portion 22 is formed, which extends from the longitudinal edge of the sealing band A toward the storage portion 5 and is formed by fusing the sheet portions 4, 4 ′ and the cloth 8. Has been. The fused portion 22 extends from the edge in the longitudinal direction of the sealing band A also in the direction of the sealing band B, and is formed across the sealing band A and the sealing band B. The fused portion 22 may extend only in the direction of the storage portion 5, but is preferably formed across the sealing band A and the sealing band B in terms of strength.

  The fusion part 22 may be a fusion part formed by fusing the sheet part 4 and the cloth 8, but a fusion part formed by fusing the sheet parts 4, 4 ′ and the cloth 8. It is preferable in terms of strength.

  Since the sealing band B also has a function of putting the contents in the packaging bag 2 and sealing it, the sealing band B may be formed after the contents are put. When the sealing strip A and the sealing strip B are formed together in advance, the bottom 16 is sealed after the contents are put.

  With such a configuration of the present invention, the storage portion 5 is sealed from the outside except the ventilation portion 16. In the ventilation part 16, the air in the storage part 5 can pass through the cut line 14 and the breathable cloth 8 to enter and exit from the outside. The cloth 8 also has a filter function for blocking foreign matter such as external dust. Further, the cloth 8 prevents the contents from leaking through the cut line 14. As described above, the packaging bag 2 of the present invention has a function of blocking foreign matter such as external dust from entering the inside while ensuring air permeability to the outside of the storage portion 5.

  The packaging bag 2 is easily opened by tearing the sheet portions 4, 4 ′ along the sealing band A. Since the sealing band A is composed of a relatively rigid and high-strength band in which the film and the cloth are fused, the sheet portions 4 and 4 ′ can be easily and linearly torn along the sealing band A. . It is more preferable in view of easy tearing operation that the film is formed of a film having tearability in the cutting direction of the sheet portions 4 and 4 '. The configuration in which the film and the cloth are fused can provide a band that is stiffer and more powerful than the configuration in which the films are fused or bonded together. This is because the fiber constituting the fabric 8 has higher strength than the film due to its molecular orientation structure, and the orientation structure is not completely lost by fusion. Another reason is that the resin constituting the sheet portion 4 (4 ′) penetrates into the gaps between the fibers of the fabric by fusion and a strong composite structure is formed.

  The cloth 8 is superimposed on the sheet portion 4 with one end portion 9 opposite to the fused portion 22 protruding from the sheet portions 4 and 4 ′ (packaging bag body). It is possible to perform a tearing operation by pinching, and the operation becomes easier.

  The sheet parts 4, 4 ′ are torn in the direction of the fusion part 22 from the opposite side of the fusion part 22. When the tear break reaches the fusion part 22, the break stops at the fusion part 22 and does not proceed any further. As a result, as shown in FIG. 4, a structure is obtained in which a narrow tape-shaped tear piece 24 is connected to one end of the opening edge of the packaging bag 2 ′ opened through the fusion part 22.

  As shown in FIG. 5, the opening edge of the packaging bag 2 ′ can be narrowed and bound by the tear piece 24 using the tear piece 24. This makes it very easy to re-wrap and close the packaging bag 2 ′ in which part of the content remains inside. Conventionally, re-wrapping and closing the packaging bag 2 ', in which part of the contents remain, has been done using strings, rubber bands, laundry scissors, etc. It took a lot of time and troublesome operation. Since the tear piece 24 has a structure in which a cloth and a film are combined, the tear piece 24 has a high strength as a long object for such binding.

  As shown in FIG. 6, the fusion part 22 may be extended to the center part of the sheet parts 4, 4 ′, for example. In this case, the gap from the end portion 9 (the opposite side of the fusion portion 22) to the center of the sheet portion 4, 4 'is opened by tearing, and the tear is stopped when it reaches the fusion portion 22. No more progress. Therefore, by changing the length L of the fused portion 22 as viewed in the width direction of the packaging bag 2g, a packaging bag having a desired opening length LO can be obtained. In the present invention, even if the packaging bag is manipulated by taking in and out the contents after opening, tearing does not proceed and the opening length LO after opening does not change. In the conventional tear opening, the opening length after opening has to be determined by adjusting the tear by hand, and an unstable operation is required. Therefore, it has been difficult to stably obtain a desired tear length. In addition, since the tearing of the opened portion further proceeds with a slight external force, when the packaging bag is manipulated by taking in and out the contents after opening, there are many cases where a constant opening length cannot be maintained.

  In the present invention, the sealing band A and the sealing band B do not necessarily have to be parallel. For example, the sealing band B is parallel to the width direction of the packaging bag 2h as in the packaging bag 2h shown in FIG. Thus, the sealing band A may be slightly inclined with respect to the sealing band B. In the embodiment shown in FIG. 7, the gap between the sealing strip A and the sealing strip B is narrowed to S at one end 19 (the end portion 9), and the fusion portion 22 has a gap between SE and SE. It is made wider than S. By setting S to 0.5 to 4 mm, tearing can be easily performed even when the sheet portions 4 and 4 ′ are made of a relatively thick film material. When S is larger than 5 mm, tearing may be difficult when the sheet portions 4 and 4 ′ are made of a relatively thick film material. It is more preferable that S is 2 to 4 mm in view of ease of tearing.

  As shown in FIG. 8, the sealing band A and the sealing band B may be not parallel to the width direction of the packaging bag 2 i. Also in this case, the gap between the sealing strip A and the sealing strip B is narrowed to S at one end 19 (the end portion 9) and wider than the SE and S at the fusion portion 22. By setting S to 0.5 to 4 mm, tearing can be easily performed even when the sheet portions 4 and 4 'are made of a relatively thick film material. It is more preferable that S is 2 to 4 mm in view of ease of tearing.

  In the embodiment shown in FIGS. 7 and 8, the cut 14 is formed at a place where the gap between the sealing band A and the sealing band B is wide near the fusion part 22. As described above, since the gap between the sealing band A and the sealing band B is wide, the sealing band may be formed on the cut 14 during the fusion operation for forming the sealing band. Is eliminated and stable machining is performed.

  Moreover, in this invention, as shown in FIG. 9, the packaging bag 2j of the same structure as FIG. 2, FIG. 3 is disclosed except the point which does not have the cut 14 (FIG. 2, FIG. 3). The packaging bag 2j does not have air permeability, but has the same excellent openability as the packaging bag 2. In the packaging bag 2j, when the sheet parts 4 and 4 'are made of a relatively thick film material, the gap S' between the sealing band A and the sealing band B is at least one of the gaps at the one end 9. 4 mm is preferable in terms of ease of tearing. S ′ is preferably 2 to 4 mm in view of ease of tearing.

  In the embodiment shown in FIG. 9, even if a tape-like material such as a tape-like film is used instead of the tape-like cloth 8, an excellent opening property can be obtained. It is more preferable in terms of openability that a tape-like cloth 8 is used as the tape-like material.

  In another aspect of the present invention, as shown in FIG. 10, the packaging bag 2a is composed of a pair of sheet parts 4, 4 'whose main bodies face each other, and in the opening part 6a constituting the opening structure 1a, the sheet The outer surface of the packaging bag 2a of the part 4 is overlapped with the tape-like cloth 8 along the longitudinal direction of the opening part 6a, and the sheet part 4 and the cloth 8 are band-like along the longitudinal direction of the opening part 6a. A fused sealing band A is formed. Further, a sealing band B ′ in which the cloth 8 and the sheet portion 4 are fused in a band shape is formed. The sealing band B ′ is arranged in parallel to the sealing band A on the opposite side of the storage portion 5 with a space from the sealing band A. A ventilation portion 16 is formed in a portion 15 between the sealing band A and the sealing band B ′ of the sheet portion 4 facing the cloth 8. FIG. 11 shows a cross-sectional view in the KK direction.

  Further, the other end portion 18 of the sealing strip A is welded to the sheet portion 4 and the cloth 8 which are extended from the longitudinal edge of the sealing strip A toward the storage portion 5. A portion 22a is formed. The fused portion 22a extends in the direction of the sealing band B ′ from the longitudinal edge of the sealing band A and is formed across the sealing band A and the sealing band B ′. The fused portion 22a may extend only in the direction of the storage portion 5, but is preferably formed across the sealing strip A and the sealing strip B 'in terms of strength.

  Still further, there is a sealing band C in which the sheet portions 4 and 4 ′ are fused in a band shape along the longitudinal direction of the opening portion 6 a at the opposite side of the sealing band A from the sealing band B ′. Is formed. The sealing band C is for sealing the contents by putting the contents in the packaging bag 2a, and the sealing band C may be formed after the contents are put. The bottom 16 of the packaging bag 2a may be sealed after being formed together with the contents.

  In another aspect of the present invention, the fusion part 22a may not be formed, and the sealing band A and the sealing band B ′ may be formed across the front width of the packaging bag 2a. Even in this case, good tearability can be obtained.

  In still another aspect of the present invention, as shown in FIG. 12, the packaging bag 2b is provided with a sealing band A and a sealing band B extending from end to end in the width direction to constitute an opening structure 1b. It may be. In this embodiment, the tear piece 24 as shown in FIG. 4 connected to one end of the opening edge portion by opening is not formed, but the packaging bag 2b is secured to the outside of the storage portion 5 and is externally provided. It has a function of blocking foreign substances such as dust so as not to enter the interior, and the operation of tearing linearly is extremely easy.

  In still another aspect of the present invention, as shown in FIG. 13, the packaging bag 2 c includes a sealing band B, and the sheet portions 4, 4 ′ and the cloth 8 are fused to one end of the sealing band B. The fused part 22 may be formed, and the opening structure 1c may be configured by these. In this embodiment, the packaging bag 2c is not secured to the outside of the storage portion 5, but a tear piece as shown in FIG. 4 connected to one end of the opening edge is formed by opening. The fusion part 22 may be formed by fusing the sheet part 4 and the cloth 8. In the embodiment shown in FIG. 13, the cloth 8 may not have air permeability.

  In still another embodiment of the present invention, as shown in FIG. 14, the packaging bag 2d is provided with a sealing band B extending from end to end in the width direction thereof, thereby forming an opening structure 1d. Also good. In this embodiment, the packaging bag 2d does not ensure air permeability to the outside of the storage unit 5, but the sealing band B is made of a relatively rigid band-like material in which the film and the cloth are fused, so that the sheet parts 4, 4 'Can be easily and linearly torn along the sealing band B.

  Also in the packaging bags 2b, 2c, and 2d, the sealing band B may be formed after the contents are put, but B is formed in advance and the bottom 16 of the packaging bag is sealed after the contents are put. May be.

  In still another aspect of the present invention, as shown in FIG. 15, the packaging bag 2 e includes the sealing band A, and the sheet parts 4, 4 ′ and the cloth 8 or the sheet part at one end part of the sealing band A. 4 and the cloth 8 may be fused to form a fused portion 22, and the opening structure 1 e may be formed by these. In the aspect shown in FIG. 16, the upper edge part 30 of the packaging bag 2e is sealed separately.

  In still another aspect of the present invention, as shown in FIG. 16, the packaging bag 2f is provided with a sealing band A extending from end to end in the width direction, thereby forming an opening structure 1f. Also good. In the embodiment shown in FIGS. 15 and 16, the sealing band A is formed of a relatively rigid band-like material in which the film and the cloth are fused, so that the sheet portion 4 can be easily and linearly formed along the sealing band A. Can be torn.

  The material of the sheet portions 4 and 4 ′ is not particularly limited as long as it is a resin that forms a tearable and heat-sealable film. Examples of this resin include polyethylene, polypropylene, polyester, and polyvinyl chloride. Moreover, the copolymer resin of each of these resin is mentioned. The resin may contain an additive such as a filler. The film constituting the sheet portions 4 and 4 ′ may be a composite film in which different kinds of films are laminated. For rice bags, the resin is preferably polyethylene from the viewpoint of cost and heat-sealing.

  The material of the cloth 8 is not particularly limited. For example, a woven tape may be used. A non-woven fabric is most preferable in terms of cost and heat-fusibility with the sheet portions 4 and 4 '. As the nonwoven fabric, a spunbonded nonwoven fabric is preferable in terms of strength and dimensional stability against external force. The material of the fibers constituting the nonwoven fabric preferably includes a material having compatibility with the material of the sheet portions 4 and 4 ′, in view of heat fusion with the sheet portions 4 and 4 ′. The fibers constituting the nonwoven fabric are heat-fusible with the sheet portions 4 and 4 'and are composite fibers of a material having compatibility with the material of the sheet portions 4 and 4' and a relatively high melting point material. And it is preferable at the point of the intensity | strength of the melt | fusion part 22 or a sealing strip.

  The packaging bag of the present invention is a storage bag for cereals such as rice bags, a bag for food such as a confectionery bag, a bag for food such as cosmetics, chemicals and chemicals, a bag for sand, gravel, cement, etc. It is suitably applied to bags for storing and transporting granular building materials, fertilizers, wood chips, resin chips, graphite, detergents, abrasives, ceramic materials, electronic materials such as ferrite, industrial products such as pigments, dyes, and toners.

  In addition, the present invention can be carried out in a mode in which various improvements, modifications, and changes are added based on the knowledge of those skilled in the art without departing from the spirit of the present invention.

It is a top view which shows the structure of an example of the aspect of the opening structure of this invention. It is a top view which shows the aspect of the cut in the opening structure shown in FIG. It is sectional drawing of PP direction of the opening structure shown in FIG. It is a plane schematic diagram which shows the state by which the packaging bag was opened. FIG. 5 is a schematic perspective view showing a mode in which an opening edge portion of the opened packaging bag shown in FIG. 4 is narrowed and bound with a tear piece. It is a top view which shows the structure of the opening structure of an example of the aspect different from the aspect shown in FIG. 2 of this invention. It is a top view which shows the structure of the opening structure of an example of the aspect different from the aspect shown in FIG. 6 of this invention. It is a top view which shows the structure of the opening structure of an example of the aspect different from the aspect shown in FIG. 7 of this invention. It is a top view which shows the structure of the opening structure of an example of the aspect different from the aspect shown in FIG. 8 of this invention. It is a top view which shows the structure of the unsealing structure of the other aspect of this invention. It is sectional drawing of the KK direction of the opening structure shown in FIG. It is a top view which shows the structure of the unsealing structure of the further another aspect of this invention. It is a top view which shows the structure of the opening structure of the further another aspect of this invention. It is a top view which shows the structure of the unsealing structure of another aspect of this invention. It is a top view which shows the structure of the opening structure of another aspect of this invention. It is a top view which shows the structure of the unsealing structure of another aspect of this invention.

Explanation of symbols

1, 1a, 1b, 1c, 1d, 1e, 1f: opening structure 2, 2a, 2b, 2c, 2d, 2e, 2f: packaging bag 4, 4 ': sheet part 6: opening part 5: storage part 16: bottom part 8: Cloth (tape-like material)
A, B, C: Sealing band 16: Ventilation part 22: Fusion part

Claims (12)

The main body is made of a film, and has a pair of sheet parts that respectively constitute a front part and a back part, and is opened by tearing in one direction provided in a packaging bag provided with a storage part for storing contents. An unsealing structure including an unsealing portion,
The sheet portion and the tape-like material are overlapped at the opening portion, and the tape-like material and at least the sheet portion facing the cloth among the pair of sheet portions are formed in a band shape along the longitudinal direction of the cloth. A fused sealing band is formed,
An opening structure in which the tape-like material is a tape-like cloth. The cloth that is extended in the width direction of the sealing band and at least one of the pair of sheet parts that faces the cloth is fused to one end of the sealing band. The unsealing structure according to claim 1, wherein a wearing portion is formed. The main body is made of a film, and has a pair of sheet parts that respectively constitute a front part and a back part, and is opened by tearing in one direction provided in a packaging bag provided with a storage part for storing contents. An unsealing structure including an unsealing portion,
In the opening part,
A sealing band A is formed in which a tape-shaped object and the sheet portion facing the tape-shaped object are fused in a band shape along the longitudinal direction of the tape-shaped object,
Opening in which a sealing band B is formed in which the tape-like material and the pair of sheet portions are fused in a band shape and spaced in parallel to the sealing band A and arranged in parallel on the opposite side of the storage portion Construction. The opening structure according to claim 3, wherein the tape-like material is a tape-like cloth. The cloth has air permeability, and a sealing band A is formed in which the cloth and the sheet portion facing the cloth are fused in a band shape along the longitudinal direction of the cloth.
The cloth and the pair of sheet parts are fused in a band shape, and a sealing band B arranged in parallel to the opposite side of the storage part at an interval from the sealing band A is formed,
The opening of Claim 1 or 2 with which the ventilation | gas_flowing part selected from a notch, a hole, and a clearance gap was formed in the part between this sealing band A and this sealing band B of the sheet | seat part which faces the said cloth. Construction. The cloth has air permeability, and a sealing band A is formed in which the cloth and the sheet portion facing the cloth are fused in a band shape along the longitudinal direction of the cloth,
The cloth and the sheet portion facing the cloth are fused in a band shape, and a sealing band C is formed which is arranged in parallel to the opposite side of the storage part at a distance from the sealing band A,
The pair of sheet portions are fused together in a band shape, and a sealing band D is formed in parallel to the opposite side of the sealing band A with a space from the sealing band C. The opening structure according to claim 1 or 2, wherein a ventilation portion selected from a cut, a hole, and a gap is formed in a portion of the sheet portion between the sealing band A and the sealing band C. The distance between the sealing band A and the sealing band B or the distance between the sealing band A and the sealing band C is 0.5 to 4 mm at least at one end of the sealing band A. The opening structure according to any one of claims 3 to 6. The distance between the sealing strip A and the sealing strip B or the spacing between the sealing strip A and the sealing strip C is widened from the one end to the other end. The opening structure described. The other end of the sealing strip A extends in the width direction of the sealing strip A, and the sheet portion facing at least the tape-shaped member of the pair of sheet portions, The unsealing structure according to any one of claims 3 to 8, wherein a fused portion is formed by fusing. The opening structure according to any one of claims 1 to 9, wherein the tape-like material is superimposed on the sheet portion in a state where one end portion of the tape-like material protrudes from an edge of the sheet portion. The opening structure according to any one of claims 1 to 10, wherein the tape-like material is a tape-like nonwoven fabric. 12. The unsealing structure according to any one of claims 1 to 11, wherein the main body is made of a film, and has a pair of sheet portions that respectively constitute a front portion and a back portion, and a storage portion that stores contents. A packaging bag including an opening edge portion that is sealed after an object is stored.

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