JP2000062799A - Packing bag with seal opening guide structure and its method of manufacture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To apply a certain direction against a tearing action at a seal opening section for a packing bag having a non-expected direction or vicious trace and the like for a seal opening section as a result of layer lamination and a bag formation, or a packing bag having no direction characteristic at all and having a similar degree of high strength in tearing in any direction. SOLUTION: A gas barrier laminated material 1 having more than one row of perforations for use in opening seal guiding action is used as a front or rear wall or front wall or rear wall at a section where the laminated material other than a gas barrier layer may become a seal opening section. In the case that both of them have a row of perforations R, these rows of perforations are aligned to each other at their positions and they are sealed at their peripheral edges.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a packaging bag and a manufacturing method thereof, and more particularly to a packaging bag having an unsealing portion provided with an unsealing guide structure and a manufacturing method thereof.

[0002]

2. Description of the Related Art Conventionally, so-called pillow packaging bags and three-sided sealing bags, which are made by using a gas barrier laminated packaging material mainly composed of a synthetic resin film, as packaging bags for subdividing foods, pharmaceuticals, liquid detergents, etc. , Standing pouches have been used.

Laminated packaging materials used for these packaging bags are those obtained by laminating a stretched film such as polyester or nylon with a sealant layer such as polyethylene (stretched film / sealant layer), or aluminum. In addition to a laminate of a foil and a sealant layer (stretched film / aluminum foil / sealant layer), a flexible packaging bag for liquids, which particularly requires strength, has a configuration in which an aluminum foil is sandwiched between stretched films ( In most cases, a stretched (biaxially stretched) film is used, such as a stretched film / aluminum foil / stretched film / sealant layer). While such a laminated packaging material has high strength, it has a problem that it is difficult to tear when it is used as a packaging bag, and it is extremely difficult to tear and open it along an opening line that is assumed in advance.

Generally, the stretching ratio of a biaxially stretched film is larger in the extrusion direction than in the width direction, so that the degree of molecular orientation in the extrusion direction is larger and the length and width directions are anisotropic. Therefore, the unsealing property of the packaging bag produced by using the composite packaging material containing such a biaxially stretched film in its constitution naturally has directionality. For example, I often experience it with a potion pack such as soy sauce sauce of rectangular instant noodles with three-sided seals, but the dotted line printed parallel to the upper side from the notch on the seal part on the side edge of the bag When trying to open along, the seal part is still good, but when tearing progresses to reach the contents storage part, the opening line suddenly goes downward on the front wall part, upward on the rear wall, etc. And will be torn at an angle to each other. This is because, in the case of this packaging form, the predominant orientation directions in the front wall portion and the rear wall portion cross each other.

In addition, in the biaxially stretched film, the stretching direction, that is, the direction in which molecules are stretched is not linear but is generally curved in a slightly bowed shape.
When this is used as a packaging material to form a composite sheet to form a packaging bag, the above-mentioned directionality (habit) remains as it is, and this hinders the determination of the tearing direction when opening the bag. It was.

The main properties desired for the opening operation of this type of packaging bag are that [a] it can be easily opened with fingers without using scissors or a knife, and in that case [b] it is easy to start opening. Further, [C] is that the tearing direction (breaking direction) at the time of opening is stable, and the opened state can be easily taken out without spilling the contents along the scheduled opening line.

[0007]

The packaging bag with the opening guide structure of the present invention has been made in view of the problems as described above, and the tearing property of the unsealing portion is improved as a result of the lamination and bag-making processing. For the packaging bag that has an unexpected directionality or habit, or for a packaging bag that has no directionality and tears in any direction have the same high strength. The purpose of the present invention is to provide a tearing material which satisfies all the requirements [a], [b] and [c] desired in the opening operation. Further, it is possible to perforate the target layer excluding the gas barrier layer, which is difficult to engrave depending on the reciprocating sewing machine such as up and down, in a semi-cut state (not in a penetrating state) or an indented state.

[0008]

The first invention of the present invention is as follows:
A gas barrier laminate material (1) in which one or more perforation unit (R) for inducing opening is engraved in a portion of the laminate material (12) other than the gas barrier layer (11) which will be an opening part in the future. Is used as one of the front and rear walls (2) and (3), or one of the front wall (2) and the rear wall (3), and when both have perforation line units (R), those perforation line units (R) ) Are aligned with each other and overlapped with each other, and are sealed at a peripheral edge portion (4) thereof, which is a packaging bag (5) with an opening guide structure.

The second invention of the present invention is to provide a gas barrier layer on a laminated material (12) in which one or more perforation unit (R) for inducing opening is engraved in a portion which will be an opening portion in the future. Gas barrier laminate material (1) in which (11) is laminated and, if necessary, a sealant layer (13) is applied to the inner surface thereof.
Is used as one of the front and rear walls (2) and (3), or one of the front wall (2) and the rear wall (3), and when both have perforation line units (R), those perforation line units (R) ) Are mutually aligned and overlapped with each other, and then sealed at the peripheral edge portion (4), which is a method for producing a packaging bag (5) with an opening guide structure.

Further, in the present invention according to the above-mentioned invention, the perforation row unit (R) has two perforations row A which are parallel to each other.
= (... ///// ...), and B = (... \\\
\\ ...), and the individual perforations (r) of the perforation rows A and B are line-symmetric with respect to the center line of the perforation row unit (R). It is a packaging bag (5) with a guiding structure.

Further, in the present invention according to the above-mentioned invention, the perforation unit (R) has two perforations A which are parallel to each other.
= (... ///// ...), and B = (... \\\
\\ ...), and the individual perforations (r) of the perforation rows A and B are those that are line-symmetric with respect to the center line of the perforation row unit (R). The packaging bag (5) with an opening guide structure according to claim 1, wherein the packaging bag (5) is shifted by 1/2 cycle in the direction.

[0012]

The perforation line unit (R) of the packaging bag (5) with the opening guide structure of the present invention has a "C" shape when the pair of perforations (r) and (r) are observed in the row direction. It is a line, and the opening direction must always be from the bottom to the top of the letter "C". In this case, the opening line is a perforation line that converges on the center line. The direction is corrected by the individual perforations (r) that make up the line. And this perforation unit (R) is generally applied from one seal part at the corner of the packaging bag to the other seal part which intersects the seal part diagonally across the contents storage part. is there. Further, the unsealing guide structure provided on the packaging bag (5) with unsealing guide structure of the present invention, that is, one or more perforation unit (R), has a large number of blades protruding along the curved surface of the cylinder (61). (6
It is formed by using a cylindrical cutter (6) having 2), but in this case, it is difficult to control by a reciprocating sewing machine such as up and down, and the target layer is in a half-cut state (not through) or indented state. This made it possible to provide perforations (r). When the perforation row unit (R) is applied to only one of the front wall (2) and the rear wall (3) for bag making, it is not necessary to align the perforation row unit (R) with each other. However, the tearing and unsealing property is somewhat lowered.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION The packaging bag with an opening guide structure and the method for producing the same according to the present invention will be described below in detail based on embodiments. FIG. 1 shows a perspective schematic view of a long gas-barrier laminated material for producing a three-side sealed bag for a packaging bag with an opening guide structure according to the present invention. Perforation row units are provided at equal intervals.
FIG. 2 shows a schematic cross-sectional view of a portion of the gas barrier laminate material of FIG. 1 which crosses a perforation unit. FIG. 3 is a perspective schematic view showing some embodiments of the packaging bag with the opening guide structure of the present invention together with the arrangement of perforation row units provided in the opening part. That (a) (b)
(C) and (d) are the unsealing part having the unsealing guide structure composed of one perforation line unit, and (c) and (d) are the unsealing part having the unsealing guide structure composed of two perforation line unit, (e).
7A to 7H show the unsealing portion having an unsealing guide structure including a plurality of perforated row units that are parallel to each other. FIG. 4 is an enlarged schematic view showing the pattern of the perforation line unit. FIG. 5 is a view showing a convex shape along a curved surface for forming a predetermined perforation unit at a predetermined position of a long gas barrier laminate material in advance when manufacturing the packaging bag with the opening guide structure of the present invention. Figure 3 shows a perspective schematic view of a cylindrical cutter with multiple blades. 1 in FIGS. 1 to 5
Is a gas barrier laminate material, 11 is a gas barrier layer, 12
Is a laminated material other than the gas barrier layer, 13 is a sealant layer,
2 is a front wall, 3 is a rear wall, 4 is a peripheral portion, 5 is a packaging bag with an opening guide structure, 6 is a cylindrical cutter, 61 is a cylinder,
62 is a blade, R is a perforation line unit, and r is a perforation. The gas barrier laminate material (1) is composed of a gas barrier layer (11), a laminate material (12) other than the gas barrier layer, and a sealant layer (13) which is optionally applied. The gas barrier layer (11) is a single layer of a high gas barrier resin film or a laminate with another synthetic resin film, a single layer of aluminum foil, a laminate of a synthetic resin film and an aluminum foil, a synthetic resin film with aluminum, For example, it is obtained by vapor deposition of silicon oxide or the like. The laminated material (12) other than the gas barrier layer is composed of a single layer or a laminated body of a synthetic resin film, or a composite laminated body of these and paper or the like. The sealant layer (13) is a gas barrier layer (1
The heat-sealing layer is formed by laminating the layered material (12) other than 1) and the gas barrier layer on the inner surface thereof, if necessary. The front wall (2) and the rear wall (3) are aligned by stacking their perforation unit (R) with each other and heat-sealed together at the peripheral edge (4). When the width is wide, it can be punched in various ways to form packaging bags of various shapes (for example, as shown in FIG. 3). The cylindrical cutter (6)
It has a large number of blades (62) provided along the curved surface of the metal cylinder (61), and is formed by, for example, an etching method. The perforation row unit (R) has two perforation rows A = (... ///// ...
,) And B = (... \\\\\ ...),
Each perforation line is a linear array of perforations (r), and this perforation unit (R) crosses the corner of the packaging bag from one seal part to the content storage part at an angle and crosses the seal part. This is applied up to other orthogonal seal parts.

[0014]

EXAMPLES Examples of the present invention will be specifically described below.

<Example 1> Stretched nylon [1 perforation line unit for guiding unsealing is already attached to a portion which will be the unsealing portion in the future by a cylindrical cutter] (thickness 25 μm
m) / a linear low-density polyethylene (150 μm) two-layer narrow and long gas-barrier laminated packaging material,
The linear low-density polyethylene surface is folded along the centerline inside to heat-seal the ends, and after filling the contents, heat-seal at regular intervals in the direction orthogonal to the heat-seal to unseal the unsealing part. A three-sided sealed packaging bag (with a size of about 3 cm × 5 cm) containing contents marked with was obtained. In this case, the perforation row unit had a width of about 1 mm, but the perforation row units on the front and rear walls overlap well, and the opening line may deviate from the perforation row unit even if the heat seal is notched. I was able to open it as planned without having to spill the contents or attach them to my fingers. Further, when the arrow indicating the opening direction was printed adjacent to the unsealing guide structure applied to the unsealing portion, the unsealing direction was not mistaken.

<Embodiment 2> Polyethylene terephthalate [1 perforation unit for guiding opening by a cylinder-shaped cutter has been added to a portion which will be an opening in the future] (thickness 12 μm) / a vapor deposited aluminum layer on the outer surface A narrow, long gas-barrier laminated packaging material consisting of three layers of stretched nylon (thickness 15 μm) / linear low-density polyethylene (thickness 120 μm) was used for the front and rear walls, and the linear low-density polyethylene surface was used. Put the contents on top of each other, heat seal both ends, and after filling the contents, heat seal at a constant interval in the direction orthogonal to the heat seal, and then open the opening with a four-way seal packaging bag (5 cm) containing the contents. × 6c
m size) was obtained. In this case, the width of the perforated line unit was about 2 mm, but the perforated line units on the front and rear walls overlap well, and the opening line deviates from the perforated line unit starting from the notch made in the heat seal part. I was able to open it as expected without any problems, so I did not spill the contents or attach them to my fingers. Furthermore, when the four-sided sealing bag obtained here is punched and the excess heat-sealed portion is cut off, a packaging bag having the shape shown in FIGS. 1B to 1D and 1F to 1H is obtained. I was able to.

<Embodiment 3> Polyethylene terephthalate having a silicon oxide vapor-deposited layer on the inner surface [5 for guiding the unsealing by a cylindrical cutter at a portion which will be the unsealing portion in the future.
Number of perforation units have been added] (thickness 12 μm) /
A bottom piece of the same structure that was prepared separately for the front and back walls using a narrow, long gas-barrier laminated packaging material consisting of three layers of stretched nylon (thickness 15 μm) / linear low density polyethylene (thickness 100 μm) Insert between the front and rear walls, stack the linear low density polyethylene surfaces inside and heat seal both ends to form a so-called standing pouch, and after filling the contents, heat seal the open part to the open part. Standing pouch (1 containing contents with opening guide structure)
A size of about 0 cm × 20 cm) was obtained. In this case, even if the heat seal part was not notched, the opening line could be opened as planned without deviating from these while moving the perforation unit, so there was no spilling of the contents or sticking to the fingers. .

<Embodiment 4> Polyethylene terephthalate [A large number of perforation unit units for guiding unsealing have been already provided to a portion to be unsealed in the future by a cylindrical cutter] (thickness 12 μm) / aluminum foil (thickness 7 μm) / drawn nylon (thickness 15 μm) / linear low-density polyethylene (thickness 100 μm), a narrow, long gas-barrier laminated packaging material for the front and rear walls, prepared separately at the bottom. Insert the bottom piece of the structure of the above between the front and rear walls, stack the linear low density polyethylene surfaces inside and heat seal both ends to form a so-called standing pouch, and after filling the contents, heat seal the opening part. Standing pouch (10 cm x 2) containing the contents with the opening guide structure over the entire top heat seal part.
A size of about 0 cm) was obtained. In this case, the heat-sealing part such as the upper end had considerable rigidity, but the notch provided here was the starting point and the opening line could be opened as planned without deviating from the perforation unit, so the contents I didn't spill it or stick it on my fingers.

[0019]

EFFECT OF THE INVENTION In the packaging bag with the opening guide structure of the present invention,
It was possible to open along a predetermined opening line in an arbitrary direction regardless of the orientation and habit of the molecules of each layer, and there was no rush to spill the contents or to attach them to fingers. Further, in the packaging bag with the opening guide structure of the present invention, even if the peripheral portions become slightly thicker due to the seals on the front and rear walls, the bag can be easily torn and opened along the predetermined opening line. Of. Especially Example 1
When the width of the perforation unit is as small as about 1 mm, if the arrow indicating the opening direction is printed adjacent to the unsealing guide structure on the unsealing part, the unsealing direction can be opened without mistake. did it.

[Brief description of drawings]

FIG. 1 is a schematic perspective view of a long gas-barrier laminated material for producing a three-way sealed bag for a packaging bag with an opening guide structure according to the present invention. Perforation row units are provided at equal intervals.

FIG. 2 is a schematic cross-sectional view of a portion of the gas barrier laminate material of FIG. 1 across a perforation unit.

FIG. 3 is a schematic perspective view showing some embodiments of the packaging bag with the opening guide structure of the present invention together with an arrangement of perforation row units provided in the opening section. That (a) (b)
(C) and (d) are the unsealing part having the unsealing guide structure composed of one perforation line unit, and (c) and (d) are the unsealing part having the unsealing guide structure composed of two perforation line unit, (e).
7A to 7H show the unsealing portion having an unsealing guide structure including a plurality of perforated row units that are parallel to each other.

FIG. 4 is an enlarged schematic view showing a pattern of a perforation row unit provided on the packaging bag with the opening guide structure of the present invention.

FIG. 5: When manufacturing the packaging bag with the unsealing guide structure of the present invention, a long perforated gas barrier laminate material is preliminarily provided along a curved surface for forming a predetermined perforation unit at a predetermined position. Figure 3 shows a perspective schematic view of a cylindrical cutter with multiple blades.

[Explanation of symbols]

1 ... Gas barrier laminate material 11 ... Gas barrier layer 12 ... Laminated material other than gas barrier layer 13 ... Sealant layer 2 ... Front wall 3 ... rear wall 4 ... Edge 5 ... Packaging bag with unsealing induction structure 6 ... Cylinder-shaped cutter 61 ... Cylinder 62 ... blade R ... Perforation unit r ... Perforation

Claims (4)

[Claims] 1. A front and back wall of a gas barrier laminate material, wherein one or more perforation unit for inducing opening is carved in a portion of the laminate material other than the gas barrier layer which will be an opening portion in the future.
Alternatively, when used as one of the front wall or the rear wall and both have perforation line units, the perforation line units are aligned with each other and overlapped with each other, and are sealed at their peripheral portions. A packaging bag with an opening guide structure. 2. A perforation row unit comprises two perforation rows A = (... ///// ...) and B = that are parallel to each other.
(... \\\\\ ...), wherein the individual perforations of the perforation rows A and B are line-symmetric with respect to the center line of the perforation row unit. A packaging bag with an opening guide structure. 3. A perforation row unit comprises two perforation rows A = (... ///// ...) and B = which are parallel to each other.
(... \\\\\\ ...), and the individual perforations of the perforation rows A and B are relatively line-symmetric with respect to the center line of the perforation row unit, 1 / in the column direction
The packaging bag with an opening guide structure according to claim 1, wherein the packaging bag is staggered by two cycles. 4. A gas barrier layer is laminated on a laminated material in which at least one perforation unit for guiding the unsealing is engraved in a portion which will be an unsealing part in the future, and further, a sealant is formed on the inner surface thereof, if necessary. When the layered gas-barrier laminated material is used as the front and rear walls, or one of the front wall and the rear wall, and both have perforation row units, these perforation row units are aligned with each other and stacked. A method for manufacturing a packaging bag with an opening guide structure, which comprises sealing at a peripheral portion thereafter.