JP2006016006A - Packaging bag having excellent uprightness - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a packaging bag having excellent uprightness with a strength in the longitudinal direction even in a regular packaging bag with a bottom part thereof not being rectangular. <P>SOLUTION: A packaging material (11) with a sealant layer (13) laminated on at least a base material (12) is formed into a cylindrical body (1) having a rectangular section with the sealant layer inside. A fold part (3) is formed by inwardly folding two sides (2) to the shorter side of the cylindrical body, respectively. Columnar reinforcing seal parts (5) extending in the longitudinal direction are formed respectively on both end edges (4) of the fold part. A bottom seal part (7) is formed by heat-bonding one end edge (6) on the overlapped long side. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a packaging bag excellent in uprightness, and in particular, relates to a packaging bag excellent in self-supporting property and display suitability while being a simple horizontal seal whose bottom is not a square bottom.

  Conventionally, for example, a square-bottomed gusset bag has been used as a packaging bag for storing miso or the like having a relatively heavy weight as contents. In order to maintain the shape of the gusset bag, it has been proposed to provide a reinforcing column seal (see, for example, Patent Document 1 and Patent Document 2).

The said prior art document is shown.
Japanese Utility Model Publication No. 49-10920 Japanese Utility Model Publication No. 50-3914.

  However, square-bottomed gusset bags can only be produced by a dedicated bag-making machine, have a low bag-making efficiency, and the square-bottom part has a complicated folded part and a right-angled seal. There is a problem that complete sealing is difficult.

  Furthermore, in a three-sided seal bag produced by a commonly used bag-making machine such as a normal four-way sealer, the packaging bag containing the contents did not maintain uprightness.

  The present invention has been made in view of the above problems of a square-bottomed gusset bag, a normal three-side seal bag, and the like, and is a normal packaging bag whose bottom is not a square bottom (a horizontal seal with a simple top and bottom seal). ) Is provided with a shallow folding portion in the lateral direction, and a reinforcing seal is applied to the folding portion, thereby providing a packaging bag having a vertical strength and excellent uprightness.

  According to a first aspect of the present invention, at least a packaging material in which a sealant layer is laminated on a base material is formed into a cylindrical body having a rectangular cross section with the sealant layer inside, and the short side of the cylindrical body Each of the two sides is folded inward to form a folded portion, and both ends of the folded portion are respectively formed with columnar reinforcing seal portions extending in the longitudinal direction, and one end edge on the overlapping long side is formed. A packaging bag excellent in uprightness, wherein the bottom seal portion is formed by heat bonding.

  As described above, according to the first aspect of the present invention, the packaging material in which the sealant layer is laminated on at least the base material is formed into a cylindrical body having a rectangular cross section with the sealant layer inside, and the cylindrical body The two sides on the short side are folded inward to form a fold, and a columnar reinforcing seal portion extending in the longitudinal direction is formed on both ends of the fold, respectively, and one of the overlapping long sides is formed. Since the bottom seal portion is formed by thermally bonding the edges, even when a relatively heavy content is stored, the uprightness is maintained when it is displayed on the display shelf. Moreover, since it is not a square bottom shape, a complicated bag making process is not required, and it can be produced by a general bag making machine.

  The invention of claim 2 is characterized in that, in the invention of claim 1, the seal width of the reinforcing seal portion is 40% or more and less than 70% with respect to the folding width of the folding portion. Excellent packaging bag.

  Thus, according to the second aspect of the present invention, the seal width of the reinforcing seal portion is 40% or more and less than 70% with respect to the folding width of the folding portion, so that excellent uprightness can be maintained.

  The invention according to claim 3 is the invention according to claim 1 or 2, wherein the folding width is 5% or more and less than 10% of the width of the long side of the cylindrical body. Excellent packaging bag.

  Thus, according to the invention described in claim 3, since the folding width is 5% or more and less than 10% of the long-side width of the cylindrical body, the packaging bag is excellent in self-supporting property and display suitability.

  Thus, the packaging bag excellent in uprightness of the present invention is provided with columnar reinforcing seal portions extending in the longitudinal direction at both end edges of the folded portion, although the bottom portion is formed by a simple horizontal seal, Even when a relatively heavy content is stored, there is an effect that the bag is kept upright when displayed on a display shelf or the like, and is excellent in self-supporting property and display suitability.

  The present invention will be described in detail below based on one embodiment.

  A packaging bag (10) excellent in uprightness according to the present invention is, for example, as shown in FIGS. 1 and 2, first, a packaging material (11) in which a sealant layer (13) is laminated on at least a base material (12). Is formed into a cylindrical body (1) having a rectangular cross section with the sealant layer (13) on the inside.

  Then, the two sides (2) on the short side of the cylindrical body (1) are respectively folded inward to form folded portions (3), and columnar shapes extending in the longitudinal direction at both end edges (4) of the folded portions. Each of the reinforcing seal portions (5) is formed, and one end edge (6) on the overlapping long side is thermally bonded to form the bottom seal portion (7).

  As the base material (12) forming the packaging material (11), generally known plastic films such as polyethylene terephthalate film, polypropylene film, nylon film, aluminum foil, thin paper, paper and metal foil can be used.

  Moreover, a printing layer and a varnish layer (not shown) can also be provided in the surface or back surface of a base material as needed.

  In order to improve the gas barrier property like an aluminum foil without using an aluminum foil, a thin film of an inorganic compound such as aluminum oxide or silicon oxide is deposited on a plastic film as a base material by a vapor deposition method such as physical vapor deposition or chemical vapor deposition. It is also possible to use an inorganic compound vapor-deposited plastic film provided to a certain thickness. As the plastic film in this case, a stretched polyethylene terephthalate film can be preferably used.

  The sealant layer (13) is a layer that imparts thermal adhesiveness to the packaging material, and a resin having a known heat-sealing property such as polyethylene, polypropylene, ethylene copolymer, and saturated polyester can be used.

When it is necessary to improve the drop strength, the piercing strength and the gas barrier property, an intermediate layer (14) can be interposed between the base material (12) and the sealant layer (13) as shown in FIG. As an intermediate | middle layer (14), a nylon film, a polyester film, etc. can be used preferably, for example. The intermediate layer (14) may include a vapor deposition layer of an inorganic compound such as silicon oxide or aluminum oxide.

The seal width (W) of the reinforcing seal portion (5) is preferably 40% or more and less than 70% of the folding width (L) of the folding portion (3).
That is, it is preferable that 0.4L ≦ W <0.7L. When the relationship of 0.4L ≦ W <0.7L is satisfied, the uprightness can be maintained, and when 0.4L or less, the effect of imparting uprightness is insufficient, and when it is 0.7L or more, the folded portion The effect of providing the content (the effect of increasing the content storage capacity) is impaired.

  Moreover, although the folding width (L) of the folding part (3) depends on the amount of contents to be stored, the left and right folding widths (L) are the widths on the long side of the cylindrical body, that is, the packaging bag. When the length (Y) in the horizontal direction is 5% or more and less than 10% (0.05Y ≦ L <0.1Y), the effect of the present invention is remarkably exhibited.

  If the folding width (L) is 0.05 Y or less, the effect of providing a folding part (effect of increasing the content storage amount) cannot be obtained, and if it exceeds 0.1 Y, the opening thickness of the packaging bag becomes wide, The bottom is square-bottomed, so it is inferior in self-supporting property and display suitability.

  A predetermined amount of contents are stored in the packaging bag (10) of the present invention having such a configuration, and the other edge (8) on the long side which is open is thermally bonded to the top seal portion (see FIG. (Not shown) to form a packaging bag containing the contents. Since this packaging bag is excellent in uprightness, it is kept upright when displayed on a display shelf.

One Example of the packaging bag excellent in the uprightness of this invention is shown, (a) is a perspective explanatory drawing, (b) is the A-A 'sectional explanatory drawing of (a). It is sectional explanatory drawing which shows typically the process of folding the cylindrical body used for the packaging bag of this invention into a bag. It is sectional explanatory drawing which shows another layer structure of the packaging material used for the packaging bag of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Cylinder body 2 ... Short side 2 sides 3 ... Folding part 4 ... Folding part edge 5 ... Reinforcement seal part 6 ... Long side side one edge 7 ... Bottom seal Part 8: The other edge on the long side
10 ... Packaging bag 11 ... Packaging material 12 ... Base material 13 ... Sealant layer 14 ... Intermediate layer L ... Folding width W ... Seal width of reinforcement seal part Y ... Width of long side of cylindrical body The lateral length of the packaging bag

Claims (3)

At least a packaging material in which a sealant layer is laminated on a base material is formed into a cylindrical body having a rectangular cross section with the sealant layer inside.
Two sides on the short side of the cylindrical body are folded inward to form folds, and columnar reinforcing seals extending in the longitudinal direction are formed on both ends of the folds, respectively.
A packaging bag excellent in uprightness, characterized in that a bottom seal portion is formed by thermally bonding one edge of the overlapping long side.   The packaging bag excellent in uprightness according to claim 1, wherein the sealing width of the reinforcing seal part is 40% or more and less than 70% with respect to the folding width of the folding part.   The packaging bag excellent in uprightness according to claim 1 or 2, wherein the folding width is 5% or more and less than 10% of the width of the long side of the cylindrical body.

Images