JP6303489B2 - Packaging bag and manufacturing method thereof - Google Patents

Description

  The present invention relates to a packaging bag in which the top and bottom portions are sealed after the packaging material is formed into a cylindrical shape, and is opened from the opening notch provided in the back-sealing seal portion, and is relatively long in the longitudinal direction of the packaging bag. The present invention relates to a packaging bag capable of forming an opening having a large opening width and a method for manufacturing the same.

  Conventionally, a so-called pillow package that rolls a piece of packaging material into a cylindrical shape to form a palm-like back-sealed seal and stores the contents between the top and bottom seals is used for a variety of applications. Has been. One method for opening a package with such a structure is to provide two opening notches in the back-sealed seal portion, and open the portion horizontally between the two opening notches as an opening start portion. How to do is known.

  However, this method is effective when a large number of vertically elongated bar-like contents are stored, such as a stick-shaped confectionery, but it is thin and has no waist, such as a wet tissue. It is unsuitable for contents with stacked contents.

  In this way, even with the same pillow packaging bag, various opening structures are required depending on the shape and properties of the contents and the method of use.

  The easy-open bag described in Patent Document 1 is provided with a notch at the intersection of the back-pasted part and the front-edge welded part, and with this as the opening start point, the back-sealed seal part is removed in a band shape and opened. It is a packaging bag that can be used.

  The easy-open bag described in Patent Document 1 has a feature that an outlet having a large opening diameter can be obtained relatively stably while having an extremely simple structure, but the shape of the outlet is linear. However, since the opening area is small, it could not be applied to the contents in which flat articles having a certain degree of waist overlap.

  Similarly, the easy-open packaging bag described in Patent Document 2 is a pillow-type packaging bag in which a slit is provided in the joint seal portion and a V-shaped cut line is provided from the cut portion to the edge seal portion. It is.

  In the easy-open packaging bag described in Patent Document 2, since the cut starting from the opening start portion spreads in a V shape, the opening is naturally performed without difficulty, and the cut stops at the edge seal portion. The opened piece does not dissociate, and simple re-sealing is possible.

  However, since the easy-open packaging bag described in Patent Document 2 has a structure in which the head of the package is opened, the flat articles overlapped as in the easy-open bag described in Patent Document 1. Such contents could not be applied.

  The easy-open packaging body described in Patent Document 3 enables a window-shaped opening to be formed in the body of the packaging bag, and further allows the opening to be resealed with a lid material using an adhesive. It is a thing.

Utility Model No. 3035855 JP 2009-40509 A Japanese Utility Model Publication No. 60-37319

  Since the easy-open packaging body described in Patent Document 3 has a large opening and can be resealed, the contents are such that flat articles with no waist overlap, such as a wet tissue. It is easy to take out and easy to use.

  However, since the easy-open packaging body described in Patent Document 3 has a complicated structure, it is not only costly, but also has a problem that it is impossible to supply the packaging material in a wound state. It was.

  The problem to be solved by the present invention is that, in a pillow packaging bag having a back-sealed seal portion, a large-area opening suitable for contents in which flat-shaped articles are stacked can be easily obtained and simplified. The present invention proposes a packaging bag that can be resealed and can be supplied by winding, and a method for manufacturing the same.

As a means for solving the above-mentioned problems, the invention according to claim 1 is characterized in that both side ends of a packaging material composed of a laminate having a heat-sealable resin layer as the innermost layer are heat-sealed in a palm-like shape. A packaging bag having a cylindrical structure in which a sticking seal portion is formed in a vertical direction,
At the top of the back-sealed seal part, there is one opening notch that triggers the opening,
The packaging material forming the body is provided with a pair of left and right opening guide lines for capturing and guiding the tear of the packaging material starting from the opening notch and proceeding in the direction in which the left and right packaging materials are easily torn. And
The opening guide line is formed by fragile processing, and is a score line that does not penetrate the packaging material, is formed symmetrically with respect to the base line of the back-sealed seal portion, and from the start point provided in the vicinity of the opening notch Start, spread in the width direction of the packaging bag, reach the end point provided below the packaging bag ,
If the direction in which the packaging material is easy to tear is the left-right direction, the starting point of the opening guide line is located above the opening notch, and if the direction in which the packaging material is easy to tear is the vertical direction, the starting point of the opening guide line is The packaging bag is located below the opening notch .

  The packaging bag according to the present invention captures the tear of the packaging material starting from the opening notch provided in the back-sealed seal portion with the opening guide line provided symmetrically, and opens along the opening guide line. An optimum opening suitable for the above can be obtained.

  The invention according to claim 2 is the packaging bag according to claim 1, wherein the opening guide line is a continuous line formed by laser processing, a broken line, a dotted line, or a combination thereof. is there.

  The invention according to claim 3 is the packaging bag according to claim 1 or 2, wherein the opening guide wire does not penetrate the heat-sealable resin layer.

  The invention according to claim 4 is the packaging bag according to any one of claims 1 to 3, wherein the opening guide line is turned in the reverse direction immediately before the end point. is there.

Moreover, invention of Claim 7 is a manufacturing method of the packaging bag of any one of Claims 1-6 characterized by including the following processes. That is,
The process of continuously creating a wide packaging material by winding.
A process of forming an opening guide line in the packaging material, slitting it to a predetermined width and winding it.
A step of unwinding a packaging material having a predetermined width to form a back seal portion.
The process of storing the contents and heat-sealing the top and bottom of the packaging bag.
This is a step of forming a notch for opening in the back seal portion.

  In the packaging bag according to the present invention, the pair of opening guide lines are formed symmetrically about the back sticker seal portion provided in the vertical direction, so that the packaging material starting from the opening notch provided in the back sticker seal portion A tear runs along the opening guide line, and a large-area opening is stably obtained.

  Since the opening guide line has a high degree of freedom, an opening having the most suitable shape and size can be designed in accordance with the shape and properties of the contents. For this reason, it is possible to cope with the usage of taking out the contents one by one, such as the overlapping of flat articles, which has been particularly difficult in the past.

  Since the opening piece generated at the time of opening remains in the packaging bag, the opening can be resealed although it is simple. Therefore, the present invention can be applied to contents that are not always used up at once.

  Since the packaging material can be supplied to the filling factory in a wound state, the packaging body as the final product can be efficiently manufactured.

  When the opening guide line is formed by laser processing, only a specific layer can be selectively cut by combining the laser wavelength and the layer structure of the laminate. As a result, a stable quality product can be obtained.

  In addition, the drawing of the opening guide line by the laser has a high degree of freedom in shape and can be combined with a dotted line or a broken line, so that an optimum opening guide line can be designed according to the purpose.

  When the opening guide line is turned in the reverse direction immediately before the end point as in the invention described in claim 4, the tear of the packaging material does not reach the end point, and thus the open piece is broken. Can be surely prevented.

FIG. 1 (1) is a perspective view showing an embodiment of a packaging bag according to the present invention. FIG. 1 (2) is a development view of the packaging material used in the packaging bag shown in FIG. 1 (1). FIG. 2A is a perspective view showing another embodiment of the packaging bag according to the present invention. FIG. 2 (2) is a development view of the packaging material used for the packaging bag shown in FIG. 2 (1). FIG. 3 (1) is a perspective view showing another embodiment of the packaging bag according to the present invention. FIG. 3 (2) is a development view of the packaging material used in the packaging bag shown in FIG. 3 (1). FIG. 4 (1) is a perspective view showing another embodiment of the packaging bag according to the present invention. FIG. 4 (2) is a development view of the packaging material used for the packaging bag shown in FIG. 4 (1). FIG. 5 (1) is a perspective view showing another embodiment of the packaging bag according to the present invention. FIG. 5 (2) is a development view of the packaging material used for the packaging bag shown in FIG. 5 (1). FIG. 6 (1) is a perspective view showing another embodiment of the packaging bag according to the present invention. FIG. 6B is a development view of the packaging material used for the packaging bag shown in FIG. FIG. 7A is a perspective view showing a conventional packaging bag used as a comparative example. FIG. 7 (2) is a development view of the packaging material used in the packaging bag shown in FIG. 7 (1).

Hereinafter, the packaging bag according to the present invention will be described in detail with reference to the drawings.
1 to 6 are views showing examples of a packaging bag according to the present invention, in which (1) is a perspective view, and (2) is the packaging shown in (1). The expansion | deployment figure of the packaging material used for the bag is shown.

  The packaging bag (1) according to the present invention is formed by laminating both end portions (3, 3) of a packaging material (2) made of a laminate having a heat-sealable resin layer as the innermost layer, and heat-sealing them in a palm shape. It is a packaging bag which has the cylindrical structure which formed the seal part (4) in the vertical direction.

  One opening notch (8) is provided on the upper part of the back-sealed seal portion (4) to trigger opening.

  For the packaging material (2) forming the body, a pair of left and right opening for capturing and guiding the tear of the packaging material starting from the opening notch (8) and proceeding in the direction in which the left and right packaging materials are easy to tear A guide wire (7) is provided.

  The opening guide line (7) is formed by fragile processing and is a score line that does not penetrate the packaging material (2), and is formed symmetrically about the base line (4a) of the back-sealed seal part (4), Starting from the starting point (s) provided in the vicinity of the opening notch (8), the packaging bag extends in the left-right width direction and reaches the end point (e) provided below the packaging bag.

  The opening guide line (7) may be a cut line that does not penetrate the packaging material (2), and is formed by a method using a blade such as a die cutter or a rotary die cutter, or a method using a laser processing machine such as a carbon dioxide laser. can do.

  The opening guide line (7) may be formed from the front side of the packaging material (2) or may be formed from the back side, but is formed from the front side of the packaging material using a laser processing machine, The method of leaving the innermost heat-sealable resin layer provides a stable quality product.

  As shown in FIG. 1, the opening guide line (7) may have a shape starting from the start point (s) and descending toward the outside and changing downward and vertically descending. However, as shown in FIG. 2, the shape may be such that it descends vertically from the starting point (s), spreads outward and descends again vertically. Moreover, as shown in FIG. 6, you may descend | fall while extending linearly from the start point (s) to the end point (e).

  The opening guide line (7) may be a continuous line or a broken line as shown in FIG. Although not particularly illustrated, a dotted line or a combination thereof may be used.

As shown in FIG. 4, the opening guide line (7) may be turned in the reverse direction immediately before the end point (e). By doing so, the tear of the packaging material starting from the opening notch (8) merges with the opening guide line (7) near the start point (s), and then reaches the end point (e) along the opening guide line. Proceeds but does not reach the end point, and the tear stops at the part where the opening guide line changes direction. For this reason, the tear does not advance too much and the opened piece is not torn. Therefore, it is preferable to take such measures in applications where there is a high need for resealing once the package is opened.

  Regarding the positional relationship between the notch for opening (8) and the starting point (s) of the opening guide line, when the packaging material (2) is easily torn in the width direction (left-right direction), FIG. 4, 5, and 6, the starting point (s) is preferably positioned above the opening notch (8).

  On the contrary, when the packaging material (2) is easily torn in the flow direction (vertical direction), as shown in FIG. 3, the starting point (s) is positioned below the opening notch (8). It is preferable to arrange so as to.

  However, even if the packaging material is easy to tear in the left-right direction, the tear of the packaging material starting from the opening notch (8) is oblique because the back-sealed seal (4) is held and the tearing is done downward. Therefore, even if the shape is as shown in FIG. 3, the tear is often captured by the opening guide line (7) and can be opened without any problem.

  Whether the packaging material (2) is easily torn in the flow direction or to the width direction depends on the individual materials used as the laminate and the bonding method, and therefore cannot be generally described. Therefore, the shape of the opening guide line (7) should be determined after determining the actual properties of the packaging material.

Next, materials used for the packaging bag (1) according to the present invention will be described.
The layer structure of the laminate constituting the packaging material (2) is not particularly limited except that the innermost layer has a heat-sealable resin layer. The most basic layer configuration is a configuration comprising a base film / heat-sealable resin layer. However, an adhesive layer for bonding them, a printing layer, and the like may naturally be included.

  Examples of the layer added to the two layers include a gas barrier layer and an intermediate layer. As a special application, a light shielding layer, an ultraviolet absorption layer, or the like may be added. The base material layer may also serve as a gas barrier layer.

  As the base material layer, a biaxially stretched film such as a polyethylene terephthalate resin film (PET), a stretched polypropylene resin film (OPP), or a stretched nylon film (ONy) is generally used in consideration of printability. It is done.

  As the gas barrier layer, aluminum foil, aluminum vapor deposition film, metal oxide vapor deposition film, various gas barrier resin films and the like are used.

  As the heat-sealable resin layer, polyolefin resins such as polyethylene resin and polypropylene resin are most commonly used. In the case of the packaging bag according to the present invention, particularly easy peelability is not required. Among them, low density polyethylene resin (LDPE), linear low density polyethylene resin (LLDPE), non-stretched, which have good sealability. A single resin such as polypropylene resin (CPP) is sufficient. The heat-sealable resin layer may be laminated by extruding the resin and extruding it to the base material layer, or by bonding one formed into a film.

For laminating these layers, a dry laminating method using an adhesive or an adhesive resin T
An extrusion laminating method in which extrusion is performed from a die and bonding, and a combination thereof are used.

  For the production of the packaging material (2), first, the substrate layer is subjected to a necessary printing process and bonded to the intermediate layer or the heat-sealable resin layer to obtain a laminate. Next, an opening guide wire (7) is formed in the packaging material (2), and slit processing is performed to a predetermined width. The opening guide line (7) may be formed after the slit processing. All of the above steps are continuously performed in a winding state.

In the filling factory, the wound packaging material (2) is unwound, a back-sealed seal part (4) is formed and processed into a cylindrical shape, the contents are filled, and the top seal part (5), bottom seal Form part (6). The top seal portion (5) and the bottom seal portion (6) may be formed at the same time and separated at the center portion. Finally, an opening notch is formed to complete the package.
Hereinafter, based on an Example, the packaging bag which concerns on this invention is demonstrated more concretely.

As a structure of the packaging material, the following four types of laminates A to D were prepared. The meanings of the abbreviations are as follows.
PET: Polyethylene terephthalate resin film ONy: Stretched nylon film PE: Polyethylene resin LDPE: Low density polyethylene resin AL: Aluminum foil EX: Extruded laminate DL: Dry laminate

<Layer Configuration of Laminate> Numbers indicate thickness (μm).
A: PET12 / ink / DL adhesive / heat-sealable resin film 40
B: ONy15 / ink / DL adhesive / heat-sealable resin film 40
C: ONy15 / ink / EX (PE20) / heat-sealable resin film 40
D: PET12 / ink / EX (PE15) / AL7 / EX (PE15) / heat-sealable resin film (LDPE) 30

  In accordance with the combinations shown in Table 1, an opening guide line having the pattern shown in FIGS. 1 to 6 was formed on each laminated body by a laser processing machine, slitted, wound up to a predetermined width, and used as a packaging material. Each packaging material was made into a bag, and a stack of raw Yatsuhashi was stored into a package.

<Evaluation of each package>
Opening suitability evaluation: A case where a desired opening area was obtained by opening according to the opening guide line when opened by hand was marked as ◯.
Evaluation of the ease of taking out the contents: When taking out the raw Yatsuhashi stacked one by one, the case where it was possible to take out the pieces one by one without taking out all the pieces was marked as ◯.
Resealability evaluation: The case where the packaging bag was not divided into two after opening and simple resealing was possible was set as (circle).

<Comparative example>
As a comparative example, the one with the opening guide line pattern shown in FIG. 7 used for the conventional hat-cut packaging bag and the one without the opening guide line were prepared. The results are shown in Table 1.

As can be seen from the results in Table 1, the packaging bag according to the present invention can secure a wide opening area, is soft like raw Yatsuhashi, and has contents that are stacked with a certain area. It became possible to take out one by one without damaging it.

DESCRIPTION OF SYMBOLS 1 ... Packaging bag 2 ... Packaging material 3 ... Side edge part 4 ... Back sticking seal part 4a ... Base line 5 of back sticking seal part ... Top seal part 6 ... Bottom seal Part 7 ... Opening guide line 8 ... Opening notch 9 ... Seal scheduled part s ... Start point e ... End point

Claims (5)

A packaging bag having a cylindrical structure in which both end portions of a packaging material made of a laminate having a heat-sealable resin layer as an innermost layer is heat-sealed in a palm shape and a back-sealed seal portion is formed in a vertical direction,
At the top of the back-sealed seal part, there is one opening notch that triggers the opening,
The packaging material forming the body is provided with a pair of left and right opening guide lines for capturing and guiding the tear of the packaging material starting from the opening notch and proceeding in the direction in which the left and right packaging materials are easily torn. And
The opening guide line is formed by fragile processing, and is a score line that does not penetrate the packaging material, is formed symmetrically with respect to the base line of the back-sealed seal portion, and from the start point provided in the vicinity of the opening notch Start, spread in the width direction of the packaging bag, reach the end point provided below the packaging bag ,
If the direction in which the packaging material is easy to tear is the left-right direction, the starting point of the opening guide line is located above the opening notch, and if the direction in which the packaging material is easy to tear is the vertical direction, the starting point of the opening guide line is A packaging bag which is located below the opening notch .   The packaging bag according to claim 1, wherein the opening guide line is formed of a continuous line, a broken line, a dotted line, or a combination thereof formed by laser processing.   The packaging bag according to claim 1, wherein the opening guide line does not penetrate the heat-sealable resin layer.   The packaging bag according to any one of claims 1 to 3, wherein the opening guide line is turned in the reverse direction immediately before the end point. The manufacturing method of the packaging bag according to any one of claims 1 to 4 , comprising the following steps.
The process of continuously creating a wide packaging material by winding.
A process of forming an opening guide line in the packaging material, slitting it to a predetermined width and winding it.
A step of unwinding a packaging material having a predetermined width to form a back seal portion.
The process of storing the contents and heat-sealing the top and bottom of the packaging bag.
Forming a notch for opening in the back seal portion;

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