JP2022039750A - Packaging bag - Google Patents

Abstract

To provide a packaging bag excellent in openability.SOLUTION: In a packaging bag having an easy-opening part at a seal part that is formed by joining films, the easy-opening part comprises a first cut group, and the first cut group includes a first and second cuts, and the first and second cuts are started from an outer edge of the seal part, and are not perpendicular to the outer edge of the seal part, and further extends in directions where the interval between the first and second cuts is made narrower as separating from the outer edge.SELECTED DRAWING: Figure 1

Description

The present invention relates to a packaging bag.

Patent Document 1 discloses a packaging bag in which a sealing portion to which a film is bonded is provided with an easy-opening portion having a plurality of minute cuts.

Japanese Unexamined Patent Publication No. 2011-6107

In Patent Document 1, it is assumed that the seal portion is torn by twisting the outer edges of the seal portion in opposite directions across the notch and applying a shearing force to the notch, thereby opening the packaging bag.

On the other hand, depending on the person, the position of the finger of the right hand that picks up the seal part and the position of the finger of the left hand may be separated when opening, and even if the outer edges of the seal part are twisted in opposite directions in such a state. In some cases, the shearing force is not efficiently transmitted to the notch, and the seal portion is difficult to tear.

The present invention has been made in view of such circumstances, and provides a packaging bag having excellent openability.

According to the present invention, it is a packaging bag having an easy-opening portion in a sealing portion to which a film is bonded, the easy-opening portion includes a first cut group, and the first cut group includes first and first cut groups. The first and second cuts, including two cuts, start from the outer edge of the seal, are non-vertical to the outer edge of the seal, and are spaced apart from the outer edge by the first and second cuts. A packaging bag is provided that extends in the narrowing direction.

When the present inventor examined the configuration of the packaging bag of Patent Document 1, although the packaging bag of Patent Document 1 is provided with a plurality of notches along the outer edge of the sealed portion, all of these notches are perpendicular to the outer edge. If the fingers of the left and right hands pinch the seals apart from each other and twist the seals, it may be difficult to apply shear force to any of the cuts. It turned out that it would end up.

Then, based on such findings, when the first and second notches are formed so as to extend in a direction in which the distance becomes narrower as the distance from the outer edge increases, rather than in the direction perpendicular to the outer edge, the fingers of the left and right hands separate from the sealing portion. It was found that even when a twist is applied to the seal portion in a state where the vertical position is picked up, a shearing force is easily applied to any of the cuts and the openability is improved, and the present invention has been completed.

Hereinafter, various embodiments of the present invention will be illustrated. The embodiments shown below can be combined with each other.
Preferably, in the packaging bag described above, the first group of cuts further comprises a third cut, the third cut is arranged between the first and second cuts and perpendicular to the outer edge. It is a packaging bag that extends.
Preferably, in the packaging bag described above, the easily opened portion further includes a second notch group, and the second notch group is arranged at a position farther from the outer edge than the first notch group. The second cut group includes the fourth to fifth cuts, the fourth cut is arranged so that its extension line passes between the first and third cuts, and the fifth cut has its extension line. A packaging bag arranged so as to pass between the second and third notches.

It is a top view of the packaging bag 1 of one embodiment of the present invention, and shows the state which the contents are not contained in the packaging bag 1. It is an enlarged view of the area A in FIG. The state after filling the contents in the packaging bag 1 of FIG. 1 and forming the upper side seal portion 3c is shown. It is explanatory drawing of the manufacturing method of a packaging bag 1.

Hereinafter, embodiments of the present invention will be described. The various features shown in the embodiments shown below can be combined with each other. In addition, the invention is independently established for each characteristic item.

1. 1. Configuration of Packaging Bag 1 As shown in FIGS. 1 to 3, the packaging bag 1 of the embodiment of the present invention has an easy-opening portion 4 on a sealing portion 3 to which a film 2 is bonded. Hereinafter, the description will proceed with the top, bottom, left, and right of FIG. 1 as the top, bottom, left, and right of the packaging bag 1.

As shown in FIG. 1, when the contents are not contained in the packaging bag 1, the length of the packaging bag 1 in the left-right direction is, for example, 140 to 240 mm, preferably 160 to 220 mm. Specifically, this length is, for example, 140, 150, 160, 170, 180, 190, 200, 210, 220, 230, 240, and is within the range between any two of the numerical values exemplified here. There may be. The value of [the vertical length of the packaging bag 1 / the horizontal length of the packaging bag 1] is, for example, 1 to 3, preferably 1.1 to 2. Specifically, this value is, for example, 1, 1.1, 1.2, 1.5, 2, 2.5, and is within the range between any two of the numerical values exemplified here. You may.

<Film 2>
The film 2 may be a single-layer film or a laminated film, and is preferably a laminated film having a base material layer and a sealant layer, and an adhesive layer may be provided between the base material layer and the sealant layer. More preferred.

The base material layer is arranged so as to be exposed on the outer surface of the packaging bag 1, and the sealant layer is arranged so as to be exposed on the inner surface of the packaging bag 1. The sealant layers 3 are heat-sealed to form the seal portion 3.

The base material layer is formed of a material having excellent strength and high impact resistance. As the base material layer, for example, heat-shrinkable polyamide, polyolefin, polyethylene, polyester and the like are used. The adhesive layer is a layer for adhering the base material layer and the sealant layer so as to be laminated on each other, and as the adhesive layer, for example, polyethylene or the like is used.

The polyamide of the base material layer preferably contains an aromatic polyamide. In this case, the base material layer has a linear cut property in the MD direction and is excellent in barrier property. The aromatic polyamide is not particularly limited, but is a resin containing 70 mol% or more of a polyamide constituent unit composed of xylylenediamine and α, ω aliphatic dicarboxylic acid having 6 to 12 carbon atoms in the molecular chain. Etc. can be used.

The sealant layer can be formed of a resin having excellent heat-sealing properties. The sealant layer can be formed of, for example, linear low-density polyethylene. As the film constituting the sealant layer, a film having a linear cut property is preferable.

Further, it is preferable that at least one of the base material layer and the sealant layer has a linear cut property. In this case, when the film 2 is torn from the easy-opening portion 4, it is easy to tear the film straight. The thickness of the sealant layer is preferably at least twice the thickness of the base material layer, and preferably at least half the thickness of the entire film 2.

The film 2 may be formed by laminating a base material layer having a thickness of 10 μm to 20 μm, for example, 15 μm, an adhesive layer having a thickness of 10 μm to 30 μm, for example, 20 μm, and a sealant layer having a thickness of 30 μm to 50 μm, for example, 40 μm. As a film 2, it usually has a thickness of 50 μm to 100 μm.

Further, the base material layer and the sealant layer are adhered so as to be laminated with each other by an adhesive layer. For example, polyethylene is used as the adhesive layer, and the base material layer and the sealant layer are bonded to each other by using an extrusion laminating method. Can be glued. Further, it is also possible to use a material other than polyethylene as the adhesive layer and to bond the base material layer and the sealant layer to each other by using the dry laminating method. Alternatively, fusion without using an adhesive layer can be used. In this way, the film 2 formed from the base material layer, the adhesive layer, and the sealant layer has high strength, impact resistance, sealing property, air resistance, and the like.

<Seal part 3>
The seal portion 3 includes a vertical seal portion 3a, a lower horizontal seal portion 3b, and an upper horizontal seal portion 3c. The vertical seal portion 3a is provided in a strip shape so as to extend in the vertical direction of the packaging bag 1, and the film 2 is formed into a tubular shape by the vertical seal portion 3a. The horizontal seal portions 3b and 3c are provided in a strip shape so as to extend in the left-right direction of the packaging bag 1. The lower horizontal seal portion 3b closes the lower side of the packaging bag 1, and the upper horizontal seal portion 3c closes the upper side of the packaging bag 1. Normally, before filling the contents of the packaging bag 1, only the vertical seal portion 3a and the lower horizontal seal portion 3b are formed as shown in FIG. 1, and the packaging bag 1 has a cylindrical shape in which the upper side is open and the lower side is closed. It has become. After filling the packaging bag 1 in this state from above, the contents are sealed in the packaging bag 1 by forming the upper horizontal seal portion 3c as shown in FIG.

The width of the seal portion 3 is, for example, 1 to 15 mm, preferably 2 to 10 mm. If this width is too narrow, the sealing strength may be insufficient, and if this width is too wide, the content may be too small for the size of the packaging bag 1. Specifically, this width is, for example, 1,1.5,2,2.5,3,3.5,4,4.5,5,6,7,8,9,10,11,12, It is 13, 14, and 15 mm, and may be within the range between any two of the numerical values exemplified here. The "width" of the seal portion 3 or the easily open portion 4 means "the length in the direction perpendicular to the outer edge 3d of the seal portion 3" unless contrary to the purpose of the description. The width of the vertical seal portion 3a or the easy-opening portion 4 provided therein means the length in the left-right direction, and the width of the horizontal seal portions 3b, 3c or the easy-opening portion 4 provided therein is the length in the vertical direction. Means.

The sealing portion 3 can be formed by bonding the facing surfaces of the film 2 to each other by heat sealing.

<Easy opening part 4>
Although the easy-opening portion 4 is formed in the vertical seal portion 3a in FIG. 1, it may be formed in the horizontal seal portions 3b and 3c.

As shown in FIG. 2, the easy-opening portion 4 includes a first cut group 5, a second cut group 6, and a third cut group 7 in this order from the outer edge 3d side of the seal portion 3. That is, the cut group 6 is arranged at a position farther from the outer edge 3d than the cut group 5, and the cut group 7 is arranged at a position farther from the outer edge 3d than the cut group 6. The outer edge 3d of the sealing portion 3 preferably coincides with the outer edge 1a of the packaging bag 1, but an unsealed portion to which the film 2 is not attached may be provided between the outer edge 3d and the outer edge 1a. One or both of the incisions groups 6 and 7 may be omitted if not needed.

The cut group 5 includes first to third cuts 5a, 5b, 5c. The cuts 5a, 5b, 5c start from the outer edge 3d of the seal portion 3 and extend toward the inner edge 3e of the seal portion 3.

The cuts 5a and 5b are non-perpendicular to the outer edge 3d of the seal portion 3 and extend in a direction in which the distance between the cuts 5a and 5b becomes narrower as the distance from the outer edge 3d increases. The cuts 5a and 5b are non-parallel to each other and extend diagonally from the outer edge 3d toward the inner edge 3e.

As shown in FIG. 3, when the seal portion 3 is twisted with the fingers 8a of the right hand and the fingers 8b of the left hand pinching the distant positions of the seal portion 3 across the notches 5a and 5b, the outer edge 3d is formed. It may be difficult to apply shear force to the cuts extending in the vertical direction, but even in such cases, shear force is applied to the cuts extending diagonally from the outer edge 3d toward the inner edge 3e, such as the cuts 5a and 5b. Since it may be easy, the openability of the packaging bag 1 is improved by providing the notches 5a and 5b.

The angles α of the cuts 5a and 5b with respect to the outer edge 3d are, for example, 45 to 85 degrees, preferably 60 to 80 degrees. If this angle is too small, it becomes difficult to tear the seal portion 3 in the direction crossing the seal portion 3, and if this angle is too large, it becomes difficult to obtain the effect of inclining the cuts 5a and 5b. Specifically, this angle is, for example, 45, 50, 55, 60, 65, 70, 75, 80, 85 degrees, and may be within the range between any two of the numerical values exemplified here. ..

The notch 5c is arranged between the notches 5a and 5b and extends perpendicular to the outer edge 3d. As a result, when the seal portion 3 is twisted, the openability is improved even when a shearing force is likely to be applied to the notch extending in the direction perpendicular to the outer edge 3d. The notch 5c can be omitted.

The cuts 5a, 5c, and 5b are arranged in this order along the direction in which the outer edge 3d extends. The distance between the adjacent notches 5a, 5b, 5c (distance in the direction along the outer edge 3d at the ends 5a1, 5a2, 5a3 on the inner edge 3e side) is, for example, 0.5 to 3 mm, specifically, For example, it is 0.5, 1.0, 1.5, 2.0, 2.5, 3.0 mm, and may be within the range between any two of the numerical values exemplified here.

The width of the notch group 5 is, for example, 0.2 to 2.0 mm, specifically, for example, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, It is 0.8, 0.9, 1.0, 1.5, 2.0 mm, and may be within the range between any two of the numerical values exemplified here.

The cut group 6 includes fourth and fifth cuts 6a and 6b. The notch 6a is arranged so that its extension line 6a1 passes between the notches 5a and 5c. The notch 6b is arranged so that its extension line 6b1 passes between the notches 5b and 5c. By providing the cut group 6, the tearing of the seal portion 3 started by the cut of the cut group 5 is connected to the cut of the cut group 6, so that the tearability of the seal portion 3 is improved. The cuts 6a and 6b may be perpendicular or non-perpendicular to the outer edge 3d. The cuts 6a and 6b are arranged along the direction in which the outer edge 3d extends. The description of the distance between the adjacent cuts 6a and 6b and the width of the cut group 6 is the same as that of the cut group 5.

The cut group 7 includes sixth to eighth cuts 7a, 7b, 7c. The cuts 7a, 7b, 7c are arranged so that the extension line 6a1 passes between the cuts 7a, 7c and the extension line 6b1 passes between the cuts 7b, 7c. The ends 5a1, 5b1, 5c1 on the inner edge 3e side of the cuts 5a, 5b, 5c are arranged on the extension lines 7a1, 7b1, 7c1 of the cuts 7a, 7b, 7c, respectively.

By providing the notch group 7, the tearing property of the seal portion 3 is improved by connecting the tearing from the notch of the notch group 5 or the notch group 6 to the notch of the notch group 7. The cuts 7a, 7b, 7c may be perpendicular or non-perpendicular to the outer edge 3d. The cuts 7a, 7c, and 7b are arranged in this order along the direction in which the outer edge 3d extends. The description of the distance between the adjacent cuts 7a, 7b, 7c and the width of the cut group 7 is the same as that of the cut group 5.

Adjacent cut groups 5, 6 and 7 may or may not overlap when viewed along the direction along the outer edge 3d (ie, projections along the outer edge 3d). When the adjacent cut groups 5, 6 and 7 do not overlap, the width W3 of the gap between the adjacent cut groups 5, 6 and 7 is preferably 1 mm or less. The gap W3 is, for example, 0 to 1 mm, and specifically, for example, 0, 0.01, 0.05, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6. , 0.7, 0.8, 0.9, 1.0 mm, and may be within the range between any two of the numerical values exemplified here.

The cut groups 5, 6 and 7 may include cuts other than the above-mentioned cuts. Further, the easy-opening portion 4 may include a cut group other than the cut groups 5, 6 and 7.

Assuming that the width of the easy-opening portion 4 is W1 and the width of the sealing portion 3 is W2, the values of W1 / W2 are, for example, 0.1 to 0.9, preferably 0.4 to 0.8. If this value is too small, the openability may deteriorate, and if this value is too large, the packaging bag 1 may be unintentionally opened. Specifically, this value is, for example, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, and here. It may be within the range between any two of the exemplified values.

The width W1 of the easily opened portion 4 is, for example, 1 to 6 mm, preferably 1.5 to 3 mm. Specifically, the width W1 is, for example, 1.5, 2.0, 2.5, 3.0, 3.5, 4.0, 4.5, 5.0, 5.5, 6.0 mm. Yes, it may be within the range between any two of the numerical values exemplified here.

The height (length in the direction along the outer edge 3d) H of the easily opened portion 4 is, for example, 2 to 8 mm, preferably 3 to 6 mm. Specifically, the height H is, for example, 2, 3, 4, 5, 6, 7, 8 mm, and may be within the range between any two of the numerical values exemplified here.

2. 2. Manufacturing Method of Packaging Bag 1 In one example, as shown in FIG. 4, the packaging bag 1 forms a vertical sealing portion 13a, a lower horizontal sealing portion 13b, and an easy-opening portion 14 with respect to the tubular film 12. By cutting the vertical seal portion 13a and the easy-opening portion 14 so as to be divided into two along the alternate long and short dash line in FIG. 4, two can be formed at the same time. The tubular film 12, the vertical seal portion 13a, the lower horizontal seal portion 13b, and the easy-open portion 14 serve as the film 2, the vertical seal portion 3a, the lower horizontal seal portion 3b, and the easy-open portion 4 of the packaging bag 1, respectively. .. According to such a method, the packaging bag 1 can be efficiently manufactured.

In the packaging bag 1, a vertical seal portion 3a is formed in a state where the seal-shaped film 2 is curved into a tubular shape to form a tubular body, and a lower horizontal seal portion 3b is formed on the tubular body to form a vertical seal portion. It may be formed by forming the easy-opening portion 4 in 3a.

3. 3. Other Embodiments The above embodiment is a three-way seal type packaging bag, but other types of packaging bags may be used. Other formats include, for example, gassho pasting, envelope pasting, four-sided stickers, gussets, and the like.

1: Packaging bag 1a: Outer edge 2: Film 3: Sealing part 3a: Vertical sealing part 3b: Lower horizontal sealing part 3c: Upper horizontal sealing part 3d: Outer edge 3e: Inner edge 4: Easy-opening part 5: First notch group 5a: Cut 5b: Cut 5c: Cut 6: Second cut group 6a: Cut 6a1: Extension line 6b: Cut 6b1: Extension line 7: Third cut group 7a: Cut 7b: Cut 7c: Cut 8a: Finger 8b : Finger 12: Cylindrical film 13a: Vertical seal portion 13b: Lower horizontal seal portion 14: Easy-opening portion A: Area

Claims (3)

It is a packaging bag that has an easy-opening part in the sealing part where the film is stuck.
The easy-to-open portion comprises a first notch group.
The first incision group includes the first and second incisions.
The first and second cuts are started from the outer edge of the seal portion, are non-perpendicular to the outer edge of the seal portion, and extend in a direction in which the distance between the first and second cuts becomes narrower as the distance from the outer edge increases. , Packaging bag. The packaging bag according to claim 1.
The first incision group further includes the third incision,
The third notch is a packaging bag that is located between the first and second notches and extends perpendicular to the outer edge. The packaging bag according to claim 2.
The easy-opening portion further comprises a second incision group.
The second incision group is arranged at a position farther from the outer edge than the first incision group.
The second incision group includes the fourth to fifth incisions and includes.
The fourth cut is arranged so that its extension line passes between the first and third cuts.
The fifth notch is a packaging bag in which the extension line is arranged so as to pass between the second and third notches.

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