JP2005075437A - Opening structure of paper bag - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain an opening structure of a paper bag capable of being opened easily and having a high closing strength. <P>SOLUTION: This paper bag comprises an inner tubular body 3 and outer tubular bodies 5, 6 and 7 surrounding the body 3. The opening end of the bag is closed by folding the opening end on both ends of the outer bags. A closing flap 1a is formed on the opening end, the opening end of the bodies 5, 6 and 7 is cut in a step-like condition, a piece 9 for opening whose longitudinal width is formed roughly in the same as the width of the bag and to whose back face side a cut tape 10 is adhered along the longitudinal direction is provided, the back face side of the piece 9 is adhered to the outermost surface of the bag so that the piece 9 in the longitudinal direction runs along the opening end, the opening end of the body 3 is sealed, the bag is folded together with the flap 1a at a folding position X below the sealed part of the body 3, and the flap tip end face is adhered to an area closer to the opening end side than to the cut tape position on the front face side of the piece 9 for closing the bag. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a paper bag opening structure that can be reliably closed and can be easily opened with a cut tape or the like.

  Conventionally, one end of an interior cylindrical body cut at a straight line at the opening end is heat-sealed, and an exterior cylindrical body made of kraft paper is arranged outside the interior cylindrical body to constitute a bag body. There has been proposed a paper bag in which one end in the vicinity is folded and the folded portion is surrounded and fixed by a paper with an opening tape (Patent Document 1).

Japanese Patent Application Laid-Open No. 5-246441 (FIG. 1, addressing paper 16, 20, heat seal portions 14, 18)

  By the way, in the above-mentioned conventional paper bag, both the interior tubular body and the exterior tubular body have straight-cut open end portions, and these multi-layered tubular bodies are integrally folded into a U-shape, Since the folded portion is enclosed with the paper from the outside and closed, the repulsive force of the folded portion is strong, and as a result, the paper applied to the closed portion may be easily broken.

  Further, since the closing structure is a structure in which the addressed paper is folded into a U-shape and both ends of the addressed paper are adhered, a force in the peeling direction is applied to the addressed paper pasting part due to the repulsive force of the folded part. For example, when the bag is accidentally dropped, there is a possibility that the closing part easily peels off and the contents leak out.

  In addition, since it is necessary to provide a cut tape on the address paper, considering the ease of opening, the address paper cannot be made too thick. Therefore, there is a structural problem that the closing strength cannot be increased.

  This invention is made | formed in view of this point, Comprising: It aims at providing the paper bag which is easy to open, ensuring sufficient closure strength of a closing part.

In order to solve the above problems, the present invention
It is composed of an inner cylindrical body located in the innermost part and a multilayer outer cylindrical body surrounding the inner cylindrical body, and the open ends are closed by bending the open ends at both ends of these cylindrical bodies. An opening structure of a paper bag having a structure, wherein a closing flap is formed at the opening end of the paper bag, and the longitudinal width is formed to be substantially the same as the width of the bag, and in the longitudinal direction on the back surface side. A single piece for opening with a cut tape attached is provided, and the back side of the single piece for opening is attached to the outermost surface of the paper bag so that the longitudinal direction of the single piece for opening is along the opening end. And sealing the opening end of the interior cylindrical body, folding the paper bag to the outermost surface side together with the closing flap at the folding position lower than the seal portion of the interior tubular body, The surface should be the cut tape position on the surface of the single piece for opening. Also it is formed using the opening structure of the paper bag, characterized in that is obtained by construction so as to close the bag and attached to the range of the opening end side.

  The interior cylindrical body is preferably composed of, for example, a synthetic resin film or an aluminum film. The multilayer outer cylindrical body is preferably composed of, for example, first to third cylindrical bodies (5, 6, 7) made of kraft paper. The range of the opening end side from the cut tape attaching position in the opening single piece is preferably, for example, the range of the upper half (9A) of the opening single piece (9). If comprised in this way, a paper bag can be easily closed by bend | folding the closing flap (1a) from bending position (X), and sticking the front end surface to the said range of the single piece for opening (9). In addition, at the time of opening, the opening piece (9) can be cut along the front edge (1a ″) of the closing flap (1a) by the cutting tape (10), and it is easy to open, It is not necessary to provide a cut tape on the closing flap (1a).

  Further, the inner cylindrical body located in the innermost part and a multilayer outer cylindrical body surrounding the inner cylindrical body, the opening ends are bent by bending the opening ends at both ends of the cylindrical body. An opening structure of a paper bag configured to be closed, wherein a closing flap integrated with at least an outermost outer tubular body is formed at the opening end of the paper bag, and the opening end of the multilayer outer tubular body is formed Is formed in a step shape, and the width in the longitudinal direction is substantially the same as the width of the bag, and a single piece for opening is provided on the back side with a cut tape attached along the longitudinal direction. The back side of the single piece for opening is stuck to the outermost surface of the paper bag so that the longitudinal direction of the single piece is along the open end, and the open end of the internal cylindrical body is sealed, and the internal cylindrical shape The paper bag is placed together with the closing flap at the folding position below the seal portion of the body. It is configured to be able to close the paper bag by folding it to the surface side of the part and sticking the front end surface of the flap to the opening end side of the opening single piece surface side of the cut tape position. It is comprised by the opening part structure of the paper bag characterized by the above-mentioned.

  The closing flap is preferably configured integrally with the cylindrical bodies (6, 7) on the back side of the second cylindrical body (6) and the third cylindrical body (7), for example. The step-like cut is preferably constituted by, for example, a step cut (ST) in which the opening ends (5a, 6a, 7a, etc.) are cut stepwise. If comprised in this way, a paper bag can be easily closed by bend | folding the closing flap (1a) from bending position (X), and sticking the front end surface to the said range of the single piece for opening (9). it can. In this case, since the opening end is cut in a step shape, the repulsive force at the time of bending is small, and the opening (2) of the paper bag can be reliably closed by the closing flap (1a), and the cut tape It can be opened easily by (10).

  Moreover, it is preferable that the bending position of the opening end is a position in the vicinity of the opening end near the center of the paper bag among the opening ends cut in the stepped shape.

  The position near the opening end near the center of the paper bag means, for example, the folding position (X) near the opening end (6a). If comprised in this way, bending position (X) will be made into the opening end (6a) position near the center part of a paper bag among the opening ends (5a, 6a, 7a) of the exterior cylindrical body of a multilayer structure, for example. Thus, the paper bag can be closed by folding only the interior cylindrical body (3) and the outer exterior cylindrical body (5) without folding the opening ends (6a, 7a). The paper bag can be reliably closed by weakening the repulsive force in the direction opposite to the folding direction.

  Further, the opening single piece is divided into an upper half and a lower half by the cut tape, and the closing flap front end surface is adhered to the upper half side surface of the opening single piece. It is preferable that the single piece for opening is configured such that only the lower surface on the lower half side is attached to the outermost surface of the paper bag.

  If comprised in this way, the lower half which stuck the single piece for opening (9) with the cut tape (10) on the said surface (1c) and the upper half part (9A) and the said surface (1c) By separating the portion (9B), it can be easily opened.

  Moreover, it is preferable that the upper half side back surface of the single piece for opening is adhered to the outermost surface with an easily peelable paste. If comprised in this way, the closing force of an opening part (2) can be strengthened more.

  Moreover, it is preferable that the front-end | tip edge of the said flap for closure in the closed state is what adjoins in parallel with the cut tape of the said single piece for opening. If comprised in this way, the single piece for opening (9) can be linearly and smoothly cut along the said front-end edge (1a '') with the cut tape (10).

  In addition, the opening structure of the paper bag is formed so as to be vertically symmetrical at the upper and lower opening ends of the paper bag, and both opening ends are closed by folding the closing flaps in opposite directions at the folding positions. It is preferable to be configured to obtain.

  With this configuration, for example, after the contents are taken out after opening the upper closing part, the lower closing part is also opened to make the paper bag into a cylindrical body, and then the inner cylindrical body and the outer cylindrical body Can be easily separated, and the recyclability and disposability as a paper bag can be improved.

  The paper bag is preferably a gusset paper bag. If comprised in this way, a folding | returning part (1d, 1d ') can be formed in the both sides of the closing flap (1a), and this flap (1a) can be reinforced.

  In this section, the reference numerals in the embodiments are described in parentheses in correspondence with the configuration of the present invention, but this is given for convenience in order to clarify the correspondence, and the configuration of the present invention is not limited to these. It is not limited to the constituent members.

  As described above, the opening structure of the paper bag according to the present invention can be reliably closed by a simple operation, and there is no need to provide a cut tape on the closing flap, so that the contents can easily leak due to impact or the like. It is possible to realize a paper bag having a strong closing force without any problem.

  Moreover, it can be easily closed simply by folding the closing flap, can be easily opened with a cut tape, can be strongly closed, and can be closed and opened very easily. An opening structure can be realized.

  Moreover, since it can cut along the front-end edge of the flap for opening with a cutting tape at the time of opening, it can open smoothly linearly.

  In addition, for example, it is possible to separate an interior cylindrical body and a paper exterior cylindrical body from a synthetic resin film, so that a paper bag excellent in recyclability and disposability can be realized.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

  FIG. 1 is a perspective view of the periphery of an opening in a paper bag opening structure according to the present invention. In the figure, reference numeral 1 denotes a gusset paper bag, which has openings 2 at the upper and lower ends as a whole (see FIGS. 5 and 6), and so-called step cuts (step-like) each having a closing flap 1a. This is formed as a cylindrical bag with ST. Since the structure of the upper and lower openings 2 described below is the same except that it has a vertically symmetrical structure, only the structure of the upper opening 2 shown in FIG. The description of the structure of the part 2 is omitted for convenience.

  In FIG. 1, 3 is an interior cylindrical body (inner bag) located on the innermost side of the gusset paper bag 1, and is composed of a synthetic resin film such as a polyethylene film or an aluminum film. The horizontal opening end 3a of the interior cylindrical body 3 is linearly cut in the transverse direction (horizontal direction), and after containing the contents, the heat seal portion 4 (FIGS. 3A and 3B). It will be closed at

  5 is a first exterior tubular body (paper tubular body) made of kraft paper located on the outer periphery of the interior tubular body 3, and surrounds the entire interior tubular body 3 from the outside; It has become. The horizontal opening end 5a of the cylindrical body 5 is cut linearly in the transverse direction (horizontal direction), and is formed in parallel with and substantially at the same height as the horizontal opening end 3a of the interior cylindrical body 3. Yes. In addition, a plurality of spot-like sticking portions 3b of the interior cylindrical body 3 are formed at several positions on the inner surface near the opening end of the cylindrical body 5, and the cylindrical body 5 and the interior cylindrical body 3 are formed. Is glued at the spot-like sticking part 3b. The spot-like sticking portion 3b is simply glued to such an extent that it can be easily peeled off by a human hand, so that only the interior tubular body 3 can be easily removed from the first exterior tubular body 5 after use. It is comprised so that it can isolate | separate.

  Reference numeral 6 denotes a second exterior tubular body (paper tubular body) made of kraft paper provided outside the tubular body 5 so as to further surround the outer periphery of the first exterior tubular body 5. The opening end 6a is linearly cut in the transverse direction (horizontal direction). The position of the opening end 6a is cut stepwise with respect to the opening end 5a so as to be lower than the opening end 5a of the first exterior tubular body 5. Further, a closing flap 6 b formed higher than the position of the opening end 3 a of the interior tubular body 3 is provided integrally with the tubular body 6 on the back side of the second tubular body 6. Yes.

  7 is a third exterior tubular body (paper tubular body) made of kraft paper located on the outer periphery of the second exterior tubular body 6, that is, the outermost periphery of the gusset paper bag 1, The open end 7a is linearly cut in the transverse direction (horizontal direction). The position of the opening end 7a is cut stepwise with respect to the opening end 6a so as to be slightly lower than the opening end 6a of the second exterior cylindrical body 6. On the back side of the third exterior tubular body 7, similarly to the second exterior tubular body 6, a closing flap 7 b formed higher than the opening end 3 a (the position is higher than the flap 6 b). ) Is provided integrally with the cylindrical body 7. And the surface of the said closing flap 7b and the back surface of the said closing flap 6b are mutually adhere | attached, and the said closing flap 1a of the two-layered state is comprised by this.

  As described above, the gusset paper bag 1 has a so-called step cut ST in which the opening end 5a, the opening end 6a and the opening end 7a, and the flaps 6b and 7b are cut in parallel with each other and stepped (stepped). The opening 2 is formed.

  On both sides of the interior tubular body 3 and the exterior tubular bodies 5 to 7, gussets (gussets) 1b and 1b ′ are formed by folding the predetermined width portions t and t inward, respectively, as shown in FIG. The gusset paper bag 1 as shown in FIG. By forming the gussets 1b and 1b ′ in this way, folded portions 1d and 1d ′ of the predetermined width portions t and t are formed on both sides of the closing flap 1a, and these folded portions 1d and 1d ′. Thus, both sides of the closing flap 1a are reinforced. In addition, the left side surface in the paper bag 1 of FIG. 1 has shown the state before folding inward and comprising a gusset.

  8 is a hot-melt paste (or other double-sided tape or the like) applied to the front surface of the closing flap 1a in parallel with the width direction of the edge (the double-dashed line in FIGS. 1 and 2) When the flap 1a is folded back to the gusset bag surface 1c side and closed, the front end surface is affixed to the surface 1c (specifically, the upper half 9A of the opening single piece 9 described later). It is something to wear.

  9 is a kraft paper unsealing single piece having a horizontally long rectangular shape as a whole, and its longitudinal direction is formed in a rectangular shape having substantially the same width as the horizontal width of the gusset bag 1. The single piece for opening 9 is attached with a cut tape 10 at a position of a perpendicular bisector on the back surface 9a side, that is, a center position parallel to the longitudinal direction (FIG. 4). A single piece 9 for opening is divided into an upper half portion 9A and a lower half portion 9B. A pair of opening cuts 11a are cut along the both side edges of the cut tape 10 at the edge of the single piece 9 at the end of the cut tape 10, thereby forming a knob 11a '. In addition, the sticking position of the cut tape of the single piece for opening 9 is not limited to the vertical bisector position (center position), but may be a position biased toward the upper half 9A side or the lower half 9B side.

  The single piece for opening 9 is coated with an adhesive S1 on the back surface 9a on the side of the lower half 9B (two-dot chain line area a in FIG. 2), and as shown in FIGS. The back surface 9a side is adhered to the outermost surface 1c of the gusset bag 1 in the vicinity of the opening end 7a with an adhesive S1 so as to be parallel to the opening end 7a (see FIGS. 2 and 3A). ). Therefore, in this case, the back surface 9a on the upper half portion 9A side of the unsealing single piece 9 is not attached to the surface 1c.

  Alternatively, the adhesive S1 is applied to the back surface 9a (two-dot chain line area a in FIG. 2) on the lower half 9B side of the opening single piece 9, and the back surface 9a on the upper half 9A side (in FIG. 2) An easily peelable paste S2 may be applied to the two-dot chain line area b), and the upper half 9A and the lower half 9B may be adhered to the surface 1c of the gusset bag 1 (FIGS. 2 and 3 (a)). )reference). Thus, the opening part 2 can be closed more strongly and reliably by sticking the upper half part 9A with the easily peelable paste S2. The opening single piece 9 has the cut tape 10 as described above and has an opening function, but the opening end can be obtained by sticking the opening single piece 9 to the surface 1c of the gusset paper bag 1. It also has a function of reinforcing the gusset bag surface 1c in the vicinity of 7a.

  In order to close the gusset bag 1 configured as described above, the contents are accommodated in the interior cylindrical body 3, and the upper and lower opening ends 3 a of the interior cylindrical body 3 are heat sealed by the heat seal portion 4. After that, the folding in the vicinity of the opening end 6a among the horizontal opening ends 5a, 6a, 7a which are lower than the heat seal portion 4 of the paper bag 1 (near the center portion of the bag 1) and are cut in a step shape. From the bent position X (see FIG. 2), the cylindrical bodies 3 and 5 are bent together with the closing flap 1a, and heat is applied to the hot melt paste 8 on the end surface of the end of the flap 1a. It sticks to the upper half 9A part of the opening single piece 9 on the surface 1c side (see FIG. 3 (a) to FIG. 3 (b)). In this case, as shown in FIG. 5, also in the lower opening 2 formed symmetrically with the upper side, the lower flap 1a is bent to the opposite side at the folding position X and pasted in the same manner. To wear.

  Then, along with the folding of the closing flap 1a, the upper end portion P (FIG. 3 (a)) including the closing flap 1a in the vicinity of the opening ends of the interior cylindrical body 3 and the first cylindrical body 5 is folded. Folded to the surface 1c side of the gusset paper bag 1 with respect to the bending position X, the hot melt glue 8 is adhered to the upper half portion 9A of the opening single piece 9 in this state, and the opening 2 is closed. (See FIG. 7). In this state, as shown in FIG. 7, the horizontal leading edge 1a ″ of the closing flap 1a is close to the cut tape 10 in the position of the upper half 9A of the closing single piece 9 At this time, the opening 2 of the paper bag 1 is the step cut ST as described above, and the folded portions are only the closing flap 1a, the interior cylindrical body 3, and the first cylindrical body 5. Since the open ends 6a and 7a of the second and third exterior cylindrical bodies 6 and 7 are not greatly bent, the repulsive force of the closing flap 1a in the direction opposite to the folding direction when the folding is performed is It is weakened and can be reliably and easily closed.The bending position may be a bending position X ′ slightly lower than the bending position X (position near the lowest opening end 7a). Even when bent at the song position X ' Similar effects can be obtained.

  Further, since the repulsive force is weak, the closing flap 1a and the unsealing single piece 9 are securely bonded, and the repulsive force does not cause a strong force in the peeling direction to the bonded portion.

  Further, as described above, since the opening single piece 9 is adhered to the surface 1c in the vicinity of the opening end 7a, the surface 1c in the vicinity of the opening where the breakage of the bag 1 is relatively likely to occur is reinforced. can do.

  Further, unlike the conventional externally attached paper having adhesive portions at both ends, the paper is closed by a closing flap 1a integrally formed by the second cylindrical body 6 and the third exterior cylindrical body 7. Because of the structure, the closing strength of the closing portion can be increased. Further, it is not necessary to provide a cut tape on the closing flap 1a, and the flap can be easily reinforced.

  Further, since the double folded portions 1d and 1d 'are present on both sides of the closing flap 1a, the strength of the closing flap 1a at the time of closing can be sufficiently maintained. Further, since the folded portions 1d and 1d 'are formed integrally with the gussets 1b and 1b' of the paper bag 1, the closing strength of the closing portion can be sufficiently maintained.

  When opening the gusset paper bag 1 configured in this way, the handle 11 a ′ of the single piece 9 for opening is held and the cut tape 10 is pulled in the opening direction (arrow direction in FIG. 7) to open the single unit for opening. The piece 9 may be divided into two parts, an upper half part 9A and a lower half part 9B (FIG. 3 (c)). At this time, the leading edge 1a ″ of the closing flap 1a is positioned in parallel with the tape 10 at a position close to the cut tape 10 (see FIGS. 7 and 8). Cutting can be performed while moving in the direction of the arrow along the leading edge 1a ", and the leading edge 1a" can exhibit a guide function in the cutting direction of the cutting tape 10, so that the single piece for opening 9 is It can be cut linearly and smoothly along the leading edge 1a ″. When the opening single piece 9 is completely divided, the folded flap 1a is opened together with the upper half 9A of the substrate 9 to be opened to expose the opening 2, and then the interior cylinder If the heat seal part 4 of the cylindrical body 3 is opened by hand, the contents of the cylindrical body 3 can be taken out.

  In the case where the upper half 9A of the opening single piece 9 is adhered with the easily peelable paste S2, the opening single piece 9 is separated, and then the upper half 9A of the opening single piece 9 is After the paper bag 1 is peeled off from the surface 1c, the closing flap 1a may be opened.

  In addition, only the interior cylindrical body 3 can be taken out separately from the exterior cylindrical bodies 5, 6, and 7, and in this case, the risk of foreign matters entering the cylindrical body 3 at the time of opening is reduced. Can do.

  After taking out the contents, the spot-like sticking portion 3b of the inner cylindrical body 3 is peeled off, and only the inner cylindrical body 3 is removed from the first cylindrical body 5 to recycle other paper. For example, it can be disposed of as non-combustible waste separately from the manufactured part. Further, the paper portion other than the interior cylindrical body 3 can be recycled.

  As described above, according to the present invention, since it is not necessary to provide the cut tape 10 on the closing flap 1a, it is easy to take a reinforcing measure such as reinforcing the closing flap by making the flap 1a into a multilayer structure. Thus, a paper bag with high closing strength can be realized.

  Moreover, since the opening part 2 becomes step cut ST in the gusset paper bag 1 of a multilayer structure, the repulsive force to a direction opposite to the bending direction in the state which folded the closure flap 1a can be made low. Accordingly, the flap 1a of the opening 2 can be easily bent, and a strong force in the peeling direction is prevented from acting on the adhesive portion of the closing flap 1a at the time of closing, thereby increasing the closing strength of the opening. It is possible to prevent accidents such as breakage of the opening (for example, the closing flap 1a).

  In addition, since the double folded portions 1d and 1d 'are formed on both sides of the closing flap 1a, the closing flap 1a is reinforced, whereby the closing strength can be increased.

  Moreover, since it is the structure which sticks the front end surface of the flap 1a for closure to the single piece 9 for opening adhere | attached on the surface 1c of the gusset paper bag 1, while improving the intensity | strength of a closing part, the cutting tape of the single piece 9 for opening 10 can realize a paper bag opening structure that can be easily opened without using any opening tool.

  Moreover, closing strength can be improved more by sticking the upper half part 9A of the single piece 9 for opening to the said gusset bag surface 1c with the easily peelable paste S2.

  Further, since the cutting direction of the cutting tape 10 can be guided by the leading edge 1a ″ of the closing flap 1a, it can be opened linearly and smoothly and cleanly.

  As described above, according to the present invention, it is possible to realize a paper bag opening structure that has high strength at the time of closing, can prevent accidents such as breakage, and at the same time, is extremely easy to close and open. Is.

  In addition, although the material which comprises the said 1st thru | or 3rd exterior cylinders 5, 6, and 7 was made into kraft paper in the said embodiment, it is not limited to the said paper, In addition, Japanese paper, printing paper, packaging paper It can be composed of various types of paper.

  Moreover, although the material of the said single piece 9 for opening is also made from kraft paper, you may use board papers, such as a corrugated cardboard, besides the various papers similar to the said exterior cylindrical body.

  The cut tape 10 may be made of synthetic resin, but is preferably made of paper such as kraft paper in consideration of recyclability and disposability.

It is a perspective view which shows the opening structure of the paper bag which concerns on this invention. It is a perspective view which shows an opening structure same as the above. It is side surface sectional drawing of the paper bag which has an opening structure same as the above, (a) is a figure which shows the state before closure of the same paper bag, (b) is a figure which shows the time of closing of the same paper bag, (c) opened the same paper bag It is a figure which shows a state. It is a rear view of the single piece for opening used for a paper bag same as the above. It is a partially omitted sectional view showing a closed state of the paper bag having the opening structure. It is a front view of a paper bag same as the above. It is a perspective view which shows the state which closed the paper bag same as the above. It is an expanded side sectional view which shows an opening structure same as the above.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Gazette paper bag 1a, 6b, 7b Closing flap 1a "Front edge 1c Surface 3 Interior cylindrical body 3a, 5a-7a Open end 4 Heat seal part 5-7 1st thru | or 3rd exterior cylindrical body 9 Opening single Piece 9A Upper half part 9B Lower half part 9a Back face 9b Front face 10 Cut tape S1 Adhesive S2 Easy peelable paste X, X 'Bending position

Claims (8)

It is composed of an inner cylindrical body located in the innermost part and a multilayer outer cylindrical body surrounding the inner cylindrical body, and the open ends are closed by bending the open ends at both ends of these cylindrical bodies. An opening structure of a paper bag having a structure,
Forming a closing flap at the open end of the paper bag;
And the length in the longitudinal direction is formed to be substantially the same as the width of the bag, and a single piece for opening with a cut tape attached along the longitudinal direction is provided on the back side, and the longitudinal direction of the single piece for opening is the above Adhering the back side of the single piece for opening to the outermost surface of the paper bag along the open end,
The opening end of the interior cylindrical body is sealed, and the paper bag is folded to the outermost surface side together with the closing flap at a folding position lower than the seal portion of the interior tubular body, and the flap front end surface The paper bag opening structure is characterized in that the paper bag can be closed by adhering to a range closer to the opening end than the position of the cut tape on the surface of the opening single piece. It is composed of an inner cylindrical body located at the innermost part and a multilayer outer cylindrical body surrounding the inner cylindrical body, and the opening ends are closed by bending the opening ends at both ends of these cylindrical bodies. An opening structure of a paper bag having a structure,
Forming a closing flap integral with at least the outermost outer cylindrical body at the opening end of the paper bag;
Cut the open end of the multi-layered outer tubular body into a stepped shape,
And the length in the longitudinal direction is formed to be substantially the same as the width of the bag, and a single piece for opening with a cut tape attached along the longitudinal direction is provided on the back side, and the longitudinal direction of the single piece for opening is the above Adhering the back side of the single piece for opening to the outermost surface of the paper bag along the open end,
The opening end of the interior cylindrical body is sealed, and the paper bag is folded to the outermost surface side together with the closing flap at a folding position lower than the seal portion of the interior tubular body, and the flap front end surface The paper bag opening structure is characterized in that the paper bag can be closed by adhering to a range closer to the opening end than the position of the cut tape on the surface of the opening single piece.   3. The opening structure of a paper bag according to claim 2, wherein the folding position of the opening end is a position in the vicinity of the opening end near the center of the paper bag among the opening ends cut in a step shape. The opening single piece is divided into an upper half and a lower half by the cut tape, and the closing flap front end surface is adhered to the upper half side surface of the opening single piece. ,
The opening part of the paper bag according to any one of claims 1 to 3, wherein only the lower half side rear surface of the single piece for opening is adhered to the outermost surface of the paper bag. Construction. In the opening structure of the paper bag according to claim 4,
An opening structure of a paper bag, characterized in that the upper half side rear surface of the single piece for opening is adhered to the outermost surface with an easily peelable adhesive.   The opening structure of the paper bag according to any one of claims 1 to 5, wherein a leading end edge of the closing flap in a closed state is close to the cutting tape of the single piece for opening. . The paper bag opening structure according to any one of claims 1 to 6 is formed so as to have a vertically symmetrical structure at the upper and lower opening ends of the paper bag,
An opening structure for a paper bag, characterized in that the both closing flaps can be folded in opposite directions at the bent position to close both open ends.   The paper bag opening structure according to any one of claims 1 to 7, wherein the paper bag is a gusset paper bag.

Images