JP7131291B2 - packaging bag - Google Patents

Description

TECHNICAL FIELD The present invention relates to a packaging bag, and more particularly to an easily openable packaging bag that is easy to open and is less likely to cause problems during the manufacturing process.

A flexible packaging bag obtained by manufacturing a laminate of flexible packaging films is used as a packaging bag for containing various contents. In order to make these packaging bags easy to open by hand, various ideas have been devised, such as using materials that are easy to cut straight, providing opening notches and half-cut lines, and so on.

In a general four-sided bag as shown in FIG. 11, there are many examples in which opening notches 8 are provided in the left and right side seal portions, respectively. A tear in the laminate film on the front and back surfaces starting from one of the notches for opening may stop at the side seal portion on the opposite side, and the tear piece may not be cut off to the end. Therefore, we start cutting again from the opening notch provided on the side seal part on the opposite side, but since the tears starting from the left and right sides do not always match, the opening piece may remain without being cut, or even if it is cut, it may have a whisker-like shape. film remains.

Similarly, in a general three-sided seal bag as shown in FIG. Even if a material with a good resistance is used, the front and back surfaces do not necessarily follow the same path, so the tear on the front and back surfaces does not match at the right end, resulting in the problem that the tear piece is not easily separated. Moreover, in this case, unlike the case of the four-sided bag, the operation of recutting from the opposite side cannot be performed.

In order to solve this problem, there is a method in which a half-cut line is provided on the laminate film by laser processing or the like to serve as an unsealing guide line. According to this method, the opening piece can be cut off reliably, and the cut end can be neatly finished.

However, the problem with this method is that the opening notch, which triggers opening, is often provided in the sealed part. The problem was that it was difficult to

In order to solve this problem, the applicant disclosed in Patent Document 1 that a laminate having a base material layer and a sealant layer is folded along a crease line parallel to the machine direction so that the sealant layer is on the inside, A packaging bag formed by sealing a peripheral portion including a top seal portion and a bottom seal portion, wherein the base material layer near the top seal portion is linearly symmetrical about the mountain crease line and has a downward convex shape. is formed, and the unsealing guide line has a horizontal portion at the bottom that intersects the mountain crease line at a right angle.

This easy-open packaging bag can be stably opened even if the position of the opening start part with respect to the opening guide line is slightly deviated, and solves the above-mentioned conventional problems. A new problem was discovered in That is, when the easy-open packaging bag described in Patent Document 1 is used in a filling packaging machine that continuously performs bag making and filling at the same time, part of the opening guide wire is caught by parts of the packaging machine, It has been found that this can cause the material to tear.

It was found that the cause of this problem was that the point at which the mountain crease line of the laminated body continuously fed from the winding and the horizontal portion of the opening guide line intersected was located near the leading end of the packaging bag in the traveling direction. of. Furthermore, it was found that one of the causes was that the unsealing start position was located at the top seal portion at the beginning in the traveling direction.

JP 2014-166854 A

The problem to be solved by the present invention is to propose an easily openable packaging bag using an opening guide wire, which is less likely to cause problems such as tearing on a filling packaging machine.

As a means for solving the above problems, the invention according to claim 1 folds a laminate having a base material layer and a sealant layer along the mountain crease lines so that the sealant layer is on the inside, and folds along the mountain crease lines. A three-side seal packaging bag formed by forming parallel side seal portions and molding into a cylindrical shape to form a top seal portion and a bottom seal portion, wherein the packaging bag is attached to the base layer near the top seal portion on the side. An unsealing guide line is provided for opening in a direction perpendicular to the seal portion, and the unsealing guide line extends from a starting point near the side seal portion of the laminate on the front side to the side of the laminate on the back side. It is a smooth curved half-cut line that reaches the end point near the seal portion, and has a portion (A portion) parallel to the side seal portion near the starting point and end point, followed by a portion parallel to the top seal portion. The packaging bag has a portion (B portion) and further has a portion (C portion) that intersects the mountain crease line at right angles, wherein the C portion is located farther from the top seal portion than the B portion. .

In addition, the invention according to claim 2 folds a laminate having a base material layer and a sealant layer along two or more mountain crease lines so that the sealant layer is on the inside, and a joint seal portion parallel to the mountain crease lines A pillow packaging bag formed by forming a cylindrical shape and forming a top seal portion and a bottom seal portion, wherein the packaging bag is placed on the base layer near the top seal portion in a direction perpendicular to the palm seal portion An unsealing guide line is provided for unsealing, and the unsealing guide line is a smooth curved half-cut line starting from a starting point near the right side of the joint seal portion of the laminate and reaching an ending point near the left side. , in the vicinity of the starting point and the end point, it has a portion (A portion) parallel to the palm seal portion, followed by a portion (B portion) parallel to the top seal portion, and further intersects the mountain crease line at a right angle. A packaging bag characterized by having a portion (C portion), wherein the C portion is located farther from the top seal portion than the B portion.

In the packaging bag according to the present invention, in the shape of the opening guide line, the portion that intersects the mountain crease line is positioned away from the top seal portion, so troubles on the filling and packaging machine can be prevented.

Further, the invention according to claim 3 is the packaging bag according to claim 1, characterized in that it has an opening start part near the top seal part of the side seal part.

Further, the invention according to claim 4 is the packaging bag according to claim 2, characterized in that it has an unsealing start part near the top seal part of the joint seal part.

Moreover, the invention according to claim 5 is the packaging bag according to claim 1 or 3, wherein the portion C of the opening guide wire is arcuate.

Moreover, invention of Claim 6 is the packaging bag of Claim 1, 3 or 5 characterized by the unsealing guidance line being not symmetrical centering on a mountain crease line.

Further, the invention according to claim 7 is the packaging bag according to any one of claims 1 to 6, characterized by having an aluminum foil layer between the base material layer and the sealant layer.

The packaging bag according to the present invention can be opened easily and neatly along the opening guidance line by providing the opening guidance line that extends almost around the opening.

In the packaging bag according to the present invention, the portion where the opening guide line and the mountain fold line intersect is positioned away from the top seal portion, which is the leading edge in the traveling direction, on the filling and packaging machine, so that the filling and packaging can be performed. It was possible to prevent damage to the opening guide wire due to contact with mechanical parts in the machine.

When the unsealing start portion is provided in the side seal portion or the joint seal portion, the opening can be formed in the direction orthogonal to the flow direction of the laminate, and the opening diameter can be maximized. It is also advantageous in terms of contact with the mechanical parts of the filling and packaging machine.

As in the invention described in claim 6, when the opening guide line has a shape that is not symmetrical about the mountain crease, the laminate on the front side and the laminate on the back side are cut at the same position in the opening. Therefore, it becomes easier to open the opening after cutting.

As in the invention according to claim 7, when an aluminum foil layer is provided between the base material layer and the sealant layer, when a laser beam is used to install the unsealing guide line, the laser beam is emitted from the aluminum Stable half-cutting is possible because it stops securely at the foil.

FIG. 1 is a schematic plan view showing a first embodiment of an easy-open packaging bag according to the present invention, which is an example of a three-sided seal packaging bag. FIG. 2 is an explanatory diagram showing a developed view of the packaging bag shown in FIG. 1 before sealing. The shape of the opening guide wire is the same as that used for the packaging bag of Example 1. FIG. 3 is a schematic plan view showing a second embodiment of an easy-open packaging bag according to the present invention, which is an example of a pillow packaging bag. FIG. 4 is an explanatory diagram showing a developed view of the packaging bag shown in FIG. 3 before sealing. FIG. 5 is a perspective explanatory view of another embodiment of the easy-open pillow packaging bag according to the present invention. FIG. 6 is a perspective explanatory view showing another example of the easy-open pillow packaging bag according to the present invention, which is an example of a gusseted pillow packaging bag. FIG. 7 is an explanatory plan view showing another shape of the opening guide wire in the easy-open packaging bag according to the present invention, which is used for the packaging bag of Example 2. FIG. FIG. 8 is an explanatory plan view showing another shape of the opening guide line in the easy-open packaging bag according to the present invention, which is used for the packaging bag of Example 3. FIG. FIG. 9 is a schematic cross-sectional view showing an example of the layer structure of the laminate used for the easy-open packaging bag according to the present invention. 10 is an explanatory plan view showing the shape of the opening guide wire used in Comparative Example 1. FIG. FIG. 11 is an explanatory diagram showing the behavior of opening lines when opening a conventional four-sided seal packaging bag. FIG. 12 is an explanatory diagram showing the behavior of the opening line when a conventional three-sided seal packaging bag is opened.

The easy-open packaging bag 1 according to the present invention will be described in detail below with reference to the drawings. FIG. 1 is a schematic plan view showing a first embodiment of an easy-open packaging bag 1 according to the present invention, which is an example of a three-sided seal packaging bag. FIG. 2 is an explanatory diagram showing a developed view of the easy-open packaging bag shown in FIG. 1 before sealing.

In the easy-open packaging bag 1 according to the present invention, a laminate having a base material layer and a sealant layer is folded along a mountain crease line 7 parallel to the flow direction L of the laminate so that the sealant layer is on the inside. A three-sided seal packaging bag formed by forming a side seal portion 3 parallel to 7 and molding it into a cylindrical shape to form a top seal portion 2 and a bottom seal portion 4, in which the base material layer near the top seal portion 2 , is provided with an opening guide line 6 for opening the packaging bag in a direction perpendicular to the flow direction of the laminate. It is a smooth curvilinear half-cut line that starts and ends at the end point 6e near the side seal portion of the laminated body on the back side. A, followed by a portion (B portion) B that is parallel to the top seal portion 2, and a portion (C portion) C that intersects the mountain crease line 7 at right angles, and has a C portion rather than the B portion. is positioned far from the top seal portion 2.

In the easy-open packaging bag 1 according to the present invention, the opening guide line 6 is formed in a portion (A portion) A parallel to the side seal portion (A portion), followed by a portion (B portion) B parallel to the top seal portion 2, and a mountain fold. It is divided into three parts, a part (C part) C that intersects the ruled line 7 at a right angle, and the C part is located farther from the top seal part 2 than the B part. It has become possible to prevent damage to the laminate at the unsealing guide line portion due to interference with parts.

The method of forming the opening guide wire 6 is not particularly limited, but by using a laser processing machine, it is possible to easily try opening guide wires of various shapes, which is efficient.

As shown in FIG. 7, the opening guide line 6 may have a shape that is not line-symmetrical about the crease line 7 . By doing so, the cutting position is shifted between the laminated body on the front side and the laminated body on the back side, so there is an advantage that the opening can be easily opened when the package is unsealed.

FIG. 3 is a schematic plan view showing a second embodiment of an easy-open packaging bag according to the present invention, which is an example of a pillow packaging bag. FIG. 4 is an explanatory diagram showing a developed view of the packaging bag shown in FIG. 3 before sealing. In the easy-open packaging bag 1 according to the present invention, a laminate having a base material layer and a sealant layer is folded along two or more crease lines 7a and 7b parallel to the flow direction L of the laminate so that the sealant layer is on the inside. A pillow packaging bag formed by folding along, forming a palm-to-palm seal portion 5 parallel to the mountain fold line and forming it into a cylindrical shape, and then forming a top seal portion 2 and a bottom seal portion 4. The base material layer is provided with an opening guide line 6 for opening the packaging bag in a direction perpendicular to the flow direction of the laminate. It is a smooth curved half-cut line starting from and reaching the end point 6e near the left side, and has a portion (A portion) A parallel to the joint seal portion 5 near the starting point 6s and the end point 6e. Subsequently, it has a portion (B portion) B parallel to the top seal portion, and further has a portion (C portion) C that intersects the mountain crease lines 7a and 7b at right angles. The packaging bag is characterized by being in a remote position.

The packaging bag shown in FIG. 3 is a buttressed pillow packaging bag, and is generally simply called a pillow packaging bag. The gist of the present invention is that by making the unsealing start part the side seal part or the palm seal part, the three-sided seal bag shown in FIG. 1 and the pillow packaging bag shown in FIG. It becomes a thing with a function effect. The opening start portion 8 may be a V-cut as shown in FIGS. 1 and 3, a U-cut, an I-cut, or the like.

FIG. 5 is a perspective explanatory view of another embodiment of the easy-open pillow packaging bag according to the present invention. Moreover, FIG. 6 is a perspective explanatory view showing another example of the easy-open pillow packaging bag according to the present invention, which is an example of a gusseted pillow packaging bag. In the case of a pillow packaging bag having a gusset portion as shown in FIG. 6, there are four crease lines. In FIG. 6, three lines 7a, 7b, and 7c are visible.

FIG. 9 is a schematic cross-sectional view showing an example of the layer structure of the laminate 10 used for the easy-open packaging bag according to the present invention. As the laminate 10, the base material layer 11 and the sealant layer 13 are essential. This example has an aluminum foil layer 12 between the base layer 11 and the sealant layer 13 . In this way, due to the presence of the aluminum foil layer 12, when forming the opening guide line 6 on the base material layer 11 using a laser processing machine, the laser beam is reflected by the aluminum layer, so that it may be cut too much. stable machining. Moreover, the gas barrier property of the laminate is not deteriorated by the unsealing guide wire.

Various synthetic resin films can be used as the synthetic resin film used for the base material layer 11. Materials commonly used include polyethylene terephthalate (PET) resin film, oriented polypropylene (OPP) resin film, and oriented polyamide. A resin film (ONy) or the like.

As a material used for the sealant layer 13, a polyolefin resin is generally used. Specifically, low density polyethylene resin (LDPE), medium density polyethylene resin (MDPE), linear low density polyethylene resin (LLDPE), ethylene-vinyl acetate copolymer (EVA), ethylene-α olefin copolymer , Ethylene-based resins such as ethylene-methacrylic acid resin copolymers, blended resins of polyethylene and polybutene, homopolypropylene resins (PP), propylene-ethylene random copolymers, propylene-ethylene book copolymers, propylene- A polypropylene-based resin such as an α-olefin copolymer is used. The easy-open packaging bag according to the present invention will be specifically described below based on examples.

<Example 1>
A PET resin film having a thickness of 12 μm was used as a base material layer, and was bonded to an aluminum foil having a thickness of 7 μm by extrusion lamination using a PE resin. Furthermore, a PE resin layer having a thickness of 30 μm was formed as a sealant layer to form a laminate. A carbon dioxide laser processing machine was used to form an unsealing guide wire having a C portion in the shape of an arc, as shown in FIG. The step between the B portion and the C portion is 5 mm.

The laminate was set in a filling bag-making machine to prepare a three-sided seal packaging bag as shown in FIG. The resulting packaging bag was visually checked for defects such as scratches. In addition, the packaging bag was immersed in water at room temperature to confirm the presence or absence of air bubbles. Furthermore, both ends were fixed to a tensile tester so that the laminated body of the packaging bag was conveyed in the conveying direction, and the tension was changed to confirm the tension (breaking tension N / 15 mm) when it was broken from the opening guide line or its vicinity. .

<Example 2>
As shown in FIG. 7, the laminate was produced in the same manner as in Example 1, except that both the B and C portions were straight and the step between the B and C portions was 5 mm. created and evaluated as well.

<Example 3>
A laminate was produced in the same manner as in Example 1, except that the shape of the unsealing guide wire was straight as shown in FIG. created and evaluated as well.

<Comparative Example 1>
As a comparative example, a laminate was produced and evaluated in the same manner as in Example 1, except that the unsealing guide wire had a shape without the C portion as shown in FIG. Table 1 shows the results.

From the results in Table 1, it was found that the easy-open packaging bag according to the present invention exhibits stable filling aptitude on a filling bag-making machine.

REFERENCE SIGNS LIST 1 Easy-open packaging bag 2 Top seal portion 3 Side seal portion 4 Bottom seal portion 5 Joint seal portion 6 Opening guide line 6s Starting point 6e End point A Part A B Part B C Part C 7, 7a, 7b, 7c Crease line L Flow direction of laminate 8 Opening start part DESCRIPTION OF SYMBOLS 10... Laminate 11... Base material layer 12... Aluminum foil layer 13... Sealant layer

Claims (7)

A laminate having a base material layer and a sealant layer is folded along the mountain crease so that the sealant layer is on the inside, forming a side seal portion parallel to the mountain crease, forming a cylindrical shape, and forming a top seal portion and a bottom seal portion. A three-side seal packaging bag formed by forming a seal portion, wherein the base material layer near the top seal portion is provided with an opening guide line for opening the packaging bag in a direction perpendicular to the side seal portion, The unsealing guide line is a smooth curved half-cut line starting from a starting point near the side seal portion of the laminate on the front side and ending at a terminal point near the side seal portion of the laminate on the back side. And near the end point, it has a portion (A portion) parallel to the side seal portion, followed by a portion (B portion) parallel to the top seal portion, and a portion (C part), and the C part is positioned farther from the top sealing part than the B part. A laminate having a base material layer and a sealant layer is folded along two or more mountain crease lines so that the sealant layer is on the inside, forming a joint seal part parallel to the mountain crease lines, forming a cylindrical shape, and forming a top A pillow packaging bag formed by forming a seal portion and a bottom seal portion, wherein the base material layer near the top seal portion is provided with an opening guide line for opening the packaging bag in a direction perpendicular to the palm-to-palm seal portion. The unsealing guide line is a smooth curved half-cut line starting from a starting point near the right side of the joint seal portion of the laminate and reaching an end point near the left side. It has a portion (A portion) parallel to the top seal portion (A portion), followed by a portion (B portion) parallel to the top seal portion, and a portion (C portion) that intersects the mountain crease line at a right angle (C portion). A packaging bag, characterized in that the C part is positioned farther from the top seal part than. 2. The packaging bag according to claim 1, further comprising an opening start portion near the top seal portion of the side seal portion. 3. The packaging bag according to claim 2, wherein an opening start portion is provided near the top seal portion of the joint seal portion. 4. The packaging bag according to claim 1 or 3, wherein the portion C of the opening guide line is arcuate. 6. The packaging bag according to claim 1, 3 or 5, wherein the opening guide line is not symmetrical with respect to the mountain crease line. The packaging bag according to any one of claims 1 to 6, further comprising an aluminum foil layer between the base layer and the sealant layer.

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