Packaging bag and method for opening the packaging bag

Abstract

To provide a packaging bag and a method for opening the packaging bag that can improve usability. [Solution] The packaging bag 1 comprises a first film 10 and a second film 20. The first film 10 and the second film 20 are sealed by a pair of side seal portions 6a and 6b and an easy-peel seal portion 7 extending from one side seal portion 6a to the other side seal portion 6b. An opening-promoting member 30 extending in a second direction d2 is attached to both the first film 10 and the second film 20. The easy-peel seal portion 7 has a top portion 8, a first inclined portion 9a, and a second inclined portion 9b. The opening-promoting member 30 is positioned at a distance from the easy-peel seal portion 7 in the first direction d1. In the packaging bag 1, the easy-peel seal portion 7 is opened using the opening-promoting member 30.

Description

Technical Field

[0004]

[0001] The present disclosure relates to a packaging bag and a method for opening the packaging bag.

Background Art

[0002] Conventionally, packaging bags for containing contents have been known (see, for example, Patent Document 1).

[0003] Patent Document 1 discloses a pouch with a chuck in which the opening of the pouch retains the shape with the mouth wide open, facilitating the removal of the contents.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, with conventional packaging bags (e.g., rectangular pouches or stand-up pouches), it is common to open them using both hands or to change the way of holding the pouch when removing the contents. Therefore, there is a need to improve the usability of the packaging bag.

[0006] The present disclosure has been made in consideration of such points, and an object thereof is to provide a packaging bag and a method for opening the packaging bag that can improve usability.

Means for Solving the Problems

[0007] Embodiments of the present disclosure relate to the following [1] to [8].

[0008] [1] A packaging bag comprising: a first film, and a second film. The first film and the second film are sealed by a pair of side seal portions extending in the longitudinal direction of the packaging bag and an easy-peel seal portion extending from one side seal portion to the other side seal portion. An opening-promoting member extending in the width direction of the packaging bag is attached to the first film and the second film, respectively. The easy-peel seal portion has a top portion, a first inclined portion extending from the top portion to one side in the width direction and inclined with respect to the width direction, and a second inclined portion extending from the top portion to the other side in the width direction and inclined with respect to the width direction on the opposite side from the first inclined portion. The opening-promoting member is provided at a position spaced apart from the easy-peel seal portion in the longitudinal direction. A packaging bag in which the easy-peel seal portion is opened using the aforementioned opening-promoting member.

[0009] [2] In a front view, at least a portion of the side sealing portion is not covered by the opening-promoting member of the packaging bag according to [1].

[0010] [3] In a front view, the opening-promoting member does not overlap the side sealing portion of the packaging bag according to [1] or [2].

[0011] [4] The packaging bag according to any one of [1] to [3], wherein the opening-promoting member attached to the first film and the opening-promoting member attached to the second film are offset from each other in a front view.

[0012] [5] The packaging bag according to any one of [1] to [4], wherein the width of the opening-promoting member is 4 mm or more and 10 mm or less, and the thickness of the opening-promoting member is 0.5 mm or more and 1.1 mm or less.

[0013] [6] The width of the easy peel seal portion is narrower than the width of the side seal portion, the packaging bag according to any one of [1] to [5].

[0014] [7] The distance between the opening promotion member and the easy peel seal portion is 0.5 mm or more and 15 mm or less, the packaging bag according to any one of [1] to [6].

[0015] [8] A step of preparing a packaging bag according to any one of [1] to [7], A step of opening the easy peel seal portion by bending the opening promotion member in a direction away from each other along the width direction, a method for opening a packaging bag.

Effect of the Invention

[0016] According to the present disclosure, the usability of the packaging bag can be improved.

Brief Description of the Drawings

[0017] [Figure 1] FIG. 1 is a front view showing a packaging bag according to an embodiment of the present disclosure. [Figure 2] FIG. 2 is a plan view (view taken in the direction of arrow II in FIG. 1) showing a packaging bag according to an embodiment of the present disclosure. [Figure 3] FIG. 3 is a plan view showing a packaging bag according to an embodiment of the present disclosure. [Figure 4] FIGS. 4(a)-(c) are diagrams showing a method for manufacturing a packaging bag according to an embodiment of the present disclosure. [Figure 5] FIGS. 5(a)-(c) are diagrams showing a method for opening a packaging bag according to an embodiment of the present disclosure. [Figure 6] FIG. 6 is a diagram for explaining a method for measuring the maximum stress in an example.

Mode for Carrying Out the Invention

[0018] An embodiment will be described below with reference to the drawings. Figures 1 to 5 are diagrams illustrating one embodiment. The following figures are schematic representations. Therefore, the size and shape of each part are exaggerated as appropriate to facilitate understanding. Furthermore, it can be modified as appropriate without departing from the technical concept. In the following figures, the same parts are denoted by the same reference numerals, and some detailed explanations may be omitted. In addition, the numerical values ​​such as dimensions and material names of each component described in this specification are examples of embodiments and are not limited to them; they can be selected and used as appropriate. In this specification, terms that specify shapes and geometric conditions, such as parallel, orthogonal, and perpendicular, will be interpreted to include not only their strict meaning but also substantially the same state.

[0019] <Packaging bag> First, an overview of the packaging bag 1 according to one embodiment of this disclosure will be described with reference to Figure 1.

[0020] As shown in Figure 1, the packaging bag 1 comprises a first film 10 and a second film 20. The packaging bag 1 shown in Figure 1 is a bag made by overlapping the first film 10 and the second film 20 and joining the first film 10 and the second film 20 to each other.

[0021] The packaging bag 1 comprises an upper edge 2, a lower edge 3 that faces the upper edge 2 in a first direction d1, and a pair of side edges 4 that extend from the upper edge 2 to the lower edge 3 in the first direction d1. Of these, the lower edge 3 has an opening 5 for containing the contents. This opening 5 is the part that is closed after the contents are placed inside the packaging bag 1. In the example shown in Figure 1, the upper edge 2 and the lower edge 3 extend in a second direction d2 perpendicular to the first direction d1, and the packaging bag 1 has a rectangular outer shape. In the illustrated example, the first direction d1 is the longitudinal direction of the packaging bag 1, and the second direction d2 is the width direction of the packaging bag 1. Although not shown, the upper edge 2 and the lower edge 3 may also extend in a direction inclined with respect to the second direction d2.

[0022] In the packaging bag 1, the first film 10 and the second film 20 are sealed by a pair of side sealing portions 6a and 6b extending in the first direction d1 (the longitudinal direction of the packaging bag 1), and an easy-peel sealing portion 7 extending from one side sealing portion 6a to the other side sealing portion 6b.

[0023] Of these, the side seal portions 6a and 6b are parts that are not intended to be opened. The seal strength of the side seal portions 6a and 6b is greater than or equal to that of the easy-peel seal portion 7. This prevents the packaging bag 1 from being opened from an unintended location due to the force acting on the packaging bag 1 when it is opened or during transportation.

[0024] The width W1 of the side sealing portions 6a and 6b may be, for example, 3 mm or more and 10 mm or less, and may be 5 mm as an example.

[0025] The easy-peel seal portion 7 is a portion intended to allow the user to peel apart the first film 10 and the second film 20 when opening the packaging bag 1. The easy-peel seal portion 7 has a top portion 8, a first inclined portion 9a, and a second inclined portion 9b. The first inclined portion 9a extends from the top portion 8 to one side of the second direction (width direction) d2 (the left side in Figure 1) and is inclined with respect to the second direction d2. The second inclined portion 9b extends from the top portion 8 to the other side of the second direction d2 (the right side in Figure 1) and is inclined with respect to the second direction d2 on the opposite side from the first inclined portion 9a.

[0026] In this embodiment, the first inclined portion 9a and the second inclined portion 9b are each formed in an arc shape. Furthermore, the first inclined portion 9a and the second inclined portion 9b are connected to form an arc with a central angle of approximately 180°. In other words, the easy-peel seal portion 7 has a shape in which multiple arcs with a central angle of approximately 180° are arranged in a convex direction. As a result, when opening the packaging bag 1, the first film 10 and the second film 20 can be easily peeled off from each other at the top 8 in the easy-peel seal portion 7. The easy-peel seal portion 7 may also be formed in a wavy shape or a zigzag shape, for example.

[0027] The width W2 of the easy-peel seal portion 7 may be narrower than the width W1 of the side seal portions 6a and 6b. This weakens the seal strength of the easy-peel seal portion 7, and as will be described later, allows the user to easily open the packaging bag 1 from the easy-peel seal portion 7. The width W2 of the easy-peel seal portion 7 may be, for example, 0.5 mm or more and 3 mm or less, and may be 1.5 mm as an example.

[0028] The method for forming the sealing portions, such as the side sealing portions 6a and 6b and the easy-peel sealing portion 7, is not particularly limited. For example, the sealing portions may be formed by welding the first film 10 and the second film 20 together by heating (heat sealing). In this case, known methods such as bar sealing, rotary roll sealing, belt sealing, impulse sealing, high-frequency sealing, or ultrasonic sealing can be used as heat sealing methods.

[0029] The first film 10 and the second film 20 may be composed of a laminate having, for example, the following layer configuration. Substrate layer (PET 12μm) / Printing layer / Adhesive layer / Sealant layer (Easy Peel Film 30μm) Substrate layer (PET 12μm) / Printing layer / Adhesive layer / Sealant layer (PE-based film 30μm) Base layer (heat-resistant OPP 20μm) / Printing layer / Adhesive layer / Sealant layer (easy-peel film 30μm) Substrate layer (MDOPE 25μm) / Printing layer / Adhesive layer / Sealant layer (Easy Peel Film 30μm) Note that " / " represents the boundary between layers (the same applies below). Furthermore, the sealant layer may be composed of an ethylene-based resin whose seal strength changes depending on the sealing temperature, in addition to the easy-peel film. For example, Lock & Peel (product name) manufactured by Mitsui Dow Polychemical Co., Ltd. may be used as the sealant layer. This makes it easier to increase the seal strength of the side seal portions 6a and 6b compared to the seal strength of the easy-peel seal portion 7. As a result, unintended opening of the side seal portions 6a and 6b when the packaging bag 1 is opened can be more effectively suppressed.

[0030] The length L1 in the longitudinal direction (first direction d1) of such packaging bag 1 may be, for example, 70 mm or more and 200 mm or less, and may be 90 mm as an example. The length L2 in the width direction (second direction d2) of packaging bag 1 may be, for example, 50 mm or more and 120 mm or less, and may be 60 mm as an example. The front shape of packaging bag 1 may be a rectangle with rounded corners.

[0031] Here, as shown in Figures 1 and 2, in this embodiment, an opening-promoting member 30 extending in the second direction (width direction of the packaging bag 1) d2 is attached to the first film 10 and the second film 20, respectively. The opening-promoting member 30 is used to open the easy-peel seal portion 7.

[0032] As shown in Figures 1 and 2, the first opening-promoting member 31 is attached to the outer surface (opposite side from the contents) of the first film 10. The second opening-promoting member 32 is attached to the outer surface (opposite side from the contents) of the second film 20. Although not shown in the figures, the first opening-promoting member 31 may also be attached to the inner surface (content side) of the first film 10. Similarly, the second opening-promoting member 32 may also be attached to the inner surface (content side) of the second film 20. In the following description, when describing the common configuration, function, or operation of the first opening-promoting member 31 and the second opening-promoting member 32, they will be collectively referred to as the opening-promoting member 30. The opening-promoting member 30 may be attached to the first film 10 and the second film 20 by adhesive or heat sealing.

[0033] Such an opening-promoting member 30 is provided at a position spaced apart from the easy-peel seal portion 7 in the first direction d1 (the longitudinal direction of the packaging bag 1). In the illustrated example, the opening-promoting member 30 is provided on the upper edge 2 side of the easy-peel seal portion 7. Although not shown in the illustration, the opening-promoting member 30 may also be provided on the lower edge 3 side (contents side) of the easy-peel seal portion 7.

[0034] The distance D1 (see Figure 1) between the opening-promoting member 30 and the easy-peel seal portion 7 may be, for example, 0.5 mm or more and 15 mm or less. When the distance D1 is 0.5 mm or more, as will be described later, it becomes easier to open the easy-peel seal portion 7 when the opening-promoting member 30 is bent. When the distance D1 is 15 mm or less, the force required to open the easy-peel seal portion 7 can be effectively applied to it. Also, when the distance D1 is 15 mm or less, the area of ​​the portion located on the upper edge 2 side of the easy-peel seal portion 7 can be kept to the minimum necessary. As a result, the amount of resin used in the packaging bag 1 can be reduced. Note that the distance D1 refers to the distance from the opening-promoting member 30 to the top 8 of the easy-peel seal portion 7 in the first direction d1.

[0035] In a front view, at least a portion of the side seal portions 6a and 6b described above does not need to be covered by the opening-promoting member 30. That is, the length L3 of the opening-promoting member 30 (see Figure 1) may be shorter than the length L2 in the width direction (second direction d2) of the packaging bag 1. This allows the user to easily fold the opening-promoting member 30 with one hand when folding it, as will be described later. Also, for example, if the opening-promoting member 30 is attached to the outer surface of the first film 10 and the outer surface of the second film 20, the sealing performance of the side seal portions 6a and 6b can be improved. The length L3 of the opening-promoting member 30 may be 40 mm or more and 110 mm or less, and as an example, it may be 45 mm. Here, if the length L3 of the opening-promoting member 30 is shorter than the width direction L2 of the packaging bag 1, the length of the part of the easy-peel seal portion 7 that is opened (distance in the second direction d2) may be shortened. In this case, it may become difficult to remove the contents from the packaging bag 1. In contrast, by having a length L3 of 40 mm or more for the opening assistance member 30, the length of the portion of the easy-peel seal 7 that is opened (the distance d2 in the second direction) can be increased. This makes it easier to remove the contents from the packaging bag 1.

[0036] In a front view, the opening-promoting member 30 does not need to overlap the side sealing portions 6a and 6b. This allows the user to fold the opening-promoting member 30 with one hand more easily, as will be described later. Furthermore, for example, if the opening-promoting member 30 is attached to the outer surface of the first film 10 and the outer surface of the second film 20, the sealing performance of the side sealing portions 6a and 6b can be improved.

[0037] Furthermore, the first opening-promoting member 31 attached to the first film 10 and the second opening-promoting member 32 attached to the second film 20 may be offset from each other in a front view. In this case, as shown in Figure 3, when the opening-promoting member 30 is bent, the side end surface 31a of the first opening-promoting member 31 and the second opening-promoting member 32 come into contact with each other. Similarly, the side end surface 32a of the second opening-promoting member 32 comes into contact with the first opening-promoting member 31. As a result, the first opening-promoting member 31 and the second opening-promoting member 32 push against each other, allowing force to be effectively applied to the first film 10 and the second film 20.

[0038] In this embodiment, as shown in Figure 2, the first opening-promoting member 31 and the second opening-promoting member 32 are positioned offset from each other in the second direction d2. Alternatively, the first opening-promoting member 31 and the second opening-promoting member 32 may be positioned offset from each other in the first direction d1. In these cases, the offset amount D2 may be, for example, 0.5 mm or more and 5 mm or less. A offset amount D2 of 0.5 mm or more makes it easier to open the easy-peel seal portion 7 when the opening-promoting member 30 is bent, as will be described later. Furthermore, a offset amount D2 of 5 mm or less makes it easier for the user to bend the first opening-promoting member 31 and the second opening-promoting member 32 with one hand. That is, when a user bends the first opening-promoting member 31 and the second opening-promoting member 32 with one hand, as the offset amount D2 increases, it becomes more difficult to grasp the pair of longitudinal ends of the first opening-promoting member 31 and the pair of longitudinal ends of the second opening-promoting member 32 with one hand. In contrast, if the displacement amount D2 is 5 mm or less, the user can more easily grasp the pair of longitudinal ends of the first opening-promoting member 31 and the pair of longitudinal ends of the second opening-promoting member 32 with, for example, the thumb and index finger of one hand. Therefore, if the displacement amount D2 is 5 mm or less, the user can more easily bend the first opening-promoting member 31 and the second opening-promoting member 32 with one hand.

[0039] Furthermore, it is preferable that the first opening-promoting member 31 and the second opening-promoting member 32 overlap at least partially when viewed from the front. This allows force to be effectively applied to the first film 10 and the second film 20 when the first opening-promoting member 31 and the second opening-promoting member 32 are deformed, as will be described later.

[0040] The width W3 of the opening assistance member 30 may be 4 mm or more and 10 mm or less, and for example, it may be 8 mm. A width W3 of 4 mm or more increases the rigidity of the opening assistance member 30 and makes it easier to grasp with one hand. Therefore, when the opening assistance member 30 is folded, as will be described later, force can be effectively applied to the first film 10 and the second film 20. Also, a width W3 of 4 mm or more increases the rigidity of the opening assistance member 30, so the opening assistance member 30 can be easily folded in the desired direction. Furthermore, a width W3 of 4 mm or more increases the rigidity of the opening assistance member 30, so the opening assistance member 30 can effectively perform the shape-retaining function described later. Also, a width W3 of 10 mm or less prevents the opening assistance member 30 from becoming too large, so the user can easily fold the opening assistance member 30 with one hand.

[0041] The thickness T of the opening-promoting member 30 may be 0.5 mm or more and 1.1 mm or less, and for example, it may be 0.8 mm. A thickness T of 0.5 mm or more increases the rigidity of the opening-promoting member 30, allowing force to be effectively applied to the first film 10 and the second film 20 when the opening-promoting member 30 is bent, as described later. Furthermore, a thickness T of 0.5 mm or more increases the rigidity of the opening-promoting member 30, allowing it to be easily bent in the desired direction. Moreover, a thickness T of 0.5 mm or more increases the rigidity of the opening-promoting member 30, allowing the opening-promoting member 30 to effectively exhibit the shape-retaining function described later. Additionally, a thickness T of 1.1 mm or less prevents the rigidity of the opening-promoting member 30 from becoming too high, allowing the user to easily bend the opening-promoting member 30 with one hand.

[0042] Such an opening-promoting member 30 is deformable and also has a shape-retaining function. As a result, as will be described later, by deforming the opening-promoting member 30, the first film 10 and the second film 20 move in a direction that separates them from each other, and the easy-peel seal portion 7 opens. Furthermore, after the easy-peel seal portion 7 has opened, the opening-promoting member 30 maintains its shape in a deformed state, thereby maintaining the open state of the easy-peel seal portion 7. In other words, as will be described later, the shape of the opening formed on the upper edge 2 is maintained by the shape-retaining function of the opening-promoting member 30.

[0043] The material constituting the opening-promoting member 30 may be, for example, polyethylene such as high-density polyethylene. For example, the opening-promoting member 30 may be made from a resin material having shape-retaining properties (for example, Forte (product name) manufactured by Sekisui Seikei Kogyo Co., Ltd.).

[0044] The packaging bag 1 shown in Figure 1 is suitably used, for example, to contain solid objects such as medical devices or solid food products.

[0045] As mentioned above, the opening 5 formed on the lower edge 3 is closed after the contents are placed inside the packaging bag 1. For this reason, in the illustrated example, the packaging bag 1 is a so-called four-sided seal type packaging bag. However, it is not limited to this, and the packaging bag 1 may be any type of seal, such as a side seal type, two-sided seal type, three-sided seal type, envelope seal type, center gusset seal type (pillow seal type), back tape type, pleated seal type, flat bottom seal type, gusset bag type, single gusset bag type, standing pouch type, tube bag type, or square bottom seal type. For this reason, the position of the opening 5 and the order in which the seal parts such as the easy-peel seal part 7 are formed may vary depending on the form of the packaging bag 1. For example, if the packaging bag 1 is a standing pouch type, the opening 5 may be provided on the side of the side seal parts 6a and 6b. Furthermore, for example, if the packaging bag 1 is a standing pouch type, the easy-peel seal portion 7 may be formed after the contents have been placed inside the packaging bag 1.

[0046] Next, the operation of the packaging bag 1 according to this embodiment, which has the above configuration, will be explained. Here, the manufacturing method of the packaging bag 1 shown in Figure 1 will be explained with reference to Figures 4(a)-(c).

[0047] <Manufacturing method for packaging bag 1> First, prepare the first film 10 and the second film 20 as shown in Figure 4(a). The first film 10 and the second film 20 may be laminates comprising, for example, a base layer, an adhesive layer, and a sealant layer.

[0048] Next, as shown in Figure 4(d), the first film 10 and the second film 20 are heat-sealed to form the side seal portions 6a and 6b and the easy-peel seal portion 7.

[0049] Subsequently, as shown in Figure 4(c), the opening-promoting member 30 is attached to the first film 10 and the second film 20 at desired positions. The opening-promoting member 30 may be attached to the first film 10 and the second film 20 by means of adhesive, for example. Although not shown in the figures, the opening-promoting member 30 may be attached to the first film 10 and the second film 20 before heat sealing them.

[0050] In this way, packaging bag 1 is obtained.

[0051] Subsequently, the contents are placed inside the packaging bag 1 through the opening 5 formed in the lower edge 3 (see Figure 1) of the packaging bag 1. Next, the lower edge 3 of the packaging bag 1 is closed by heat sealing the area near the lower edge 3. In this way, the contents are sealed inside the packaging bag 1.

[0052] Next, the method for opening the packaging bag 1 shown in Figure 1 will be explained with reference to Figures 5(a)-(c).

[0053] <How to open packaging bag 1> First, prepare packaging bag 1 as shown in Figure 5(a).

[0054] Next, as shown in Figure 5(b), the easy-peel seal portion 7 is opened by folding the opening-promoting member 30 in a direction that separates them from each other along the second direction d2 (the width direction of the packaging bag 1). That is, the first opening-promoting member 31 is folded in a direction that separates it from the second opening-promoting member 32 along the second direction d2 (the direction indicated by arrow A1 in Figure 5(b)). The second opening-promoting member 32 is also folded in a direction that separates it from the first opening-promoting member 31 along the second direction d2 (the direction indicated by arrow A2 in Figure 5(b)). At this time, for example, the user grasps the first opening-promoting member 31 and the second opening-promoting member 32 with the thumb and index finger of one hand. In this way, the user folds the first opening-promoting member 31 and the second opening-promoting member 32. As a result, the first film 10 and the second film 20 move in a direction that separates them from each other.

[0055] Then, as the first film 10 and the second film 20 move in a direction that separates them from each other, a force acts on the top 8 of the easy-peel seal portion 7, causing the easy-peel seal portion 7 to open.

[0056] Furthermore, the opening-promoting member 30 has a shape-retaining function. As a result, as shown in Figure 5(c), the shape of the upper edge 2 is maintained so that the opening formed on the upper edge 2 is approximately rectangular in plan view. This ensures that the user can easily remove the contents.

[0057] As described above, according to this embodiment, the packaging bag 1 comprises a first film 10 and a second film 20. The first film 10 and the second film 20 are sealed by a pair of side sealing portions 6a and 6b extending in a first direction d1, and an easy-peel sealing portion 7 extending from one side sealing portion 6a to the other side sealing portion 6b. An opening-promoting member 30 extending in a second direction d2 is attached to both the first film 10 and the second film 20. The easy-peel sealing portion 7 has a top portion 8, a first inclined portion 9a extending from the top portion 8 to one side in the second direction d2 and inclined with respect to the second direction d2, and a second inclined portion 9b extending from the top portion 8 to the other side in the second direction d2 and inclined with respect to the second direction d2 in the opposite direction to the first inclined portion 9a. Furthermore, the opening-promoting member 30 is positioned at a distance from the easy-peel seal portion 7 in the first direction d1. Then, the easy-peel seal portion 7 is opened in the packaging bag 1 using the opening-promoting member 30. This allows, for example, a user to open the packaging bag 1 with one hand.

[0058] In this embodiment, the easy-peel seal portion 7 is opened by bending the opening-promoting member 30 in a direction that separates them from each other along the second direction d2. At this time, the user can open the packaging bag 1 by bending the first opening-promoting member 31 and the second opening-promoting member 32 with one hand. Furthermore, after opening the packaging bag 1, the shape of the opening formed on the upper edge 2 is maintained by the shape-retaining function of the opening-promoting member 30. Therefore, the user can easily remove the contents. In this way, the usability of the packaging bag 1 can be improved according to this embodiment.

[0059] Furthermore, according to this embodiment, in a front view, at least a portion of the side sealing portions 6a and 6b is not covered by the opening-promoting member 30. This allows the user to easily bend the opening-promoting member 30 with one hand when bending it. Also, for example, if the opening-promoting member 30 is attached to the outer surface of the first film 10 and the outer surface of the second film 20, the sealing performance of the side sealing portions 6a and 6b can be improved.

[0060] Furthermore, according to this embodiment, in a front view, the opening-promoting member 30 does not overlap the side sealing portions 6a and 6b. This makes it easier for the user to fold the opening-promoting member 30 with one hand. Also, for example, if the opening-promoting member 30 is attached to the outer surface of the first film 10 and the outer surface of the second film 20, the sealing performance of the side sealing portions 6a and 6b can be improved.

[0061] Furthermore, according to this embodiment, the first opening-promoting member 31 attached to the first film 10 and the second opening-promoting member 32 attached to the second film 20 are positioned offset from each other in a front view. As a result, when the first opening-promoting member 31 and the second opening-promoting member 32 are bent, they press against each other, allowing force to be effectively applied to the first film 10 and the second film 20.

[0062] Furthermore, according to this embodiment, the width W2 of the easy-peel seal portion 7 is narrower than the width W1 of the side seal portions 6a and 6b. This reduces the seal strength of the easy-peel seal portion 7, allowing the user to easily open the packaging bag 1 from the easy-peel seal portion 7. [Examples]

[0063] Next, we will describe specific examples of the above embodiments.

[0064] (Example 1) A packaging bag 1 was manufactured as shown in Figure 1. The longitudinal length L1 of the packaging bag 1 was 100 mm, and the width L2 of the packaging bag 1 was 60 mm. The width W2 of the easy-peel seal portion 7 was 1 mm. The first film 10 and the second film 20 were made from laminates having the following layer configurations. Substrate layer (PET 12μm) / Printing layer / Adhesive layer / Sealant layer (Easy Peel Film 30μm)

[0065] The opening-promoting member 30 was attached to the outer surface of the first film 10 and the outer surface of the second film 20 with hot-melt adhesive. The length L3 of the opening-promoting member 30 was 45 mm, the thickness T of the opening-promoting member 30 was 0.4 mm, and the width W3 of the opening-promoting member 30 was 6 mm. The distance D1 between the opening-promoting member 30 and the easy-peel seal portion 7 was 4 mm.

[0066] (Example 2) The packaging bag 1 was manufactured in the same manner as in Example 1, except that the width W3 of the opening-prompting member 30 was 8 mm.

[0067] (Example 3) A packaging bag 1 was manufactured in the same manner as in Example 1, except that the thickness T of the opening-promoting member 30 was 0.6 mm and the width W3 of the opening-promoting member 30 was 4 mm.

[0068] (Example 4) A packaging bag 1 was manufactured in the same manner as in Example 1, except that the thickness T of the opening-promoting member 30 was 0.6 mm and the width W3 of the opening-promoting member 30 was 6 mm.

[0069] (Example 5) A packaging bag 1 was manufactured in the same manner as in Example 1, except that the thickness T of the opening-promoting member 30 was 0.6 mm and the width W3 of the opening-promoting member 30 was 8 mm.

[0070] (Example 6) A packaging bag 1 was manufactured in the same manner as in Example 1, except that the thickness T of the opening-promoting member 30 was 0.9 mm and the width W3 of the opening-promoting member 30 was 5 mm.

[0071] (Example 7) A packaging bag 1 was manufactured in the same manner as in Example 1, except that the thickness T of the opening-promoting member 30 was 0.9 mm and the width W3 of the opening-promoting member 30 was 10 mm.

[0072] (Example 8) A packaging bag 1 was manufactured in the same manner as in Example 1, except that the thickness T of the opening-promoting member 30 was 1.1 mm and the width W3 of the opening-promoting member 30 was 4 mm.

[0073] (Example 9) A packaging bag 1 was manufactured in the same manner as in Example 1, except that the thickness T of the opening-promoting member 30 was 1.1 mm and the width W3 of the opening-promoting member 30 was 10 mm.

[0074] (1) Measurement of maximum stress The maximum stress was measured when the opening-promoting member 30 used in packaging bag 1 according to Examples 1 to 9 was compressed in the longitudinal direction. To measure the maximum stress, first, as shown in Figure 6, one end of the opening-promoting member 30 in the longitudinal direction was fixed with a pair of chucks 61. Then, the other end of the opening-promoting member 30 in the longitudinal direction was compressed using a flat plate 62 having a planar shape larger than the thickness T and width W3 of the opening-promoting member 30. The maximum stress at this time was then measured. At the start of the measurement, the distance D3 between the chucks 61 and the flat plate 62 was set to 30 mm. The movement speed of the flat plate 62 was set to 20 mm / min.

[0075] (2) Evaluation of ease of opening The packaging bags 1 according to Examples 1 to 9 were opened using the methods shown in Figures 5(a)-(c). The ease of opening each packaging bag 1 was then evaluated according to the following criteria. (Evaluation Criteria) A: Packaging bag 1 was very easy to open. B: Packaging bag 1 could be easily opened. C: The rigidity of the opening-promoting member 30 felt low or high, but the packaging bag 1 could be opened.

[0076] The results are shown in Table 1.

[0077] [Table 1]

[0078] As a result, as shown in Table 1, in all of the packaging bags 1 according to Examples 1 to 9, the packaging bag 1 could be opened by using the opening-promoting member 30. In particular, in the packaging bags 1 according to Examples 3 to 5 and Example 8, the packaging bag 1 could be easily opened by using the opening-promoting member 30. Therefore, it was found that the usability of the packaging bag 1 can be improved according to this embodiment.

[0079] Furthermore, as shown in Table 1, in the packaging bags 1 according to Examples 3 to 5 and Example 8, where the maximum stress of the opening-promoting member 30 was between 13.9 N and 28.1 N, the packaging bag 1 could be easily opened. Therefore, it is considered that the usability of the packaging bag 1 can be further improved when the maximum stress of the opening-promoting member 30 is between 10 N and 45 N.

[0080] It is also possible to combine the multiple components disclosed in each of the above embodiments as needed. Alternatively, some components may be removed from all the components shown in each of the above embodiments. [Explanation of symbols]

[0081] 1 packaging bag 6a Side seal portion 6b Side seal section 7. Easy-peel seal section 8 top 9a 1st slope 9b 2nd slope part 10 First Film 20 Second film 30 Opening-promoting member 31. First opening facilitator 32. Second opening promotion member

Claims

1. It is a packaging bag, The first film and It comprises a second film, The first film and the second film are sealed by a pair of side sealing portions extending in the longitudinal direction of the packaging bag and an easy-peel sealing portion extending from one side sealing portion to the other side sealing portion. An opening-promoting member extending in the width direction of the packaging bag is attached to the first film and the second film, respectively. The easy-peel seal portion has a top portion, a first inclined portion extending from the top portion to one side in the width direction and inclined with respect to the width direction, and a second inclined portion extending from the top portion to the other side in the width direction and inclined with respect to the width direction on the opposite side from the first inclined portion. The opening-promoting member is provided at a position spaced apart from the easy-peel seal portion in the longitudinal direction. A packaging bag in which the easy-peel seal portion is opened using the aforementioned opening-promoting member.

2. The packaging bag according to claim 1, wherein, in a front view, at least a portion of the side sealing portion is not covered by the opening-promoting member.

3. The packaging bag according to claim 1, wherein, in a front view, the opening-promoting member does not overlap the side sealing portion.

4. The packaging bag according to claim 1, wherein the opening-promoting member attached to the first film and the opening-promoting member attached to the second film are positioned offset from each other in a front view.

5. The packaging bag according to claim 1, wherein the width of the opening-promoting member is 4 mm or more and 10 mm or less, and the thickness of the opening-promoting member is 0.5 mm or more and 1.1 mm or less.

6. The packaging bag according to claim 1, wherein the width of the easy-peel seal portion is narrower than the width of the side seal portion.

7. The packaging bag according to claim 1, wherein the distance between the opening-promoting member and the easy-peel seal portion is 0.5 mm or more and 15 mm or less.

8. A step of preparing a packaging bag according to any one of claims 1 to 7, A method for opening a packaging bag, comprising the step of opening the easy-peel seal portion by bending the opening-promoting members in a direction that separates them from each other along the width direction.

Images