JP5925488B2 - Packaging bag - Google Patents

Description

  The present invention relates to a packaging bag formed from a resin sheet.

  In recent years, instead of bottle containers such as plastic bottles and glass bottles, packaging bags in which resin sheets are formed in a bag shape have been used as containers. Packaging bags formed from resin sheets can save resources compared to bottle containers such as plastic bottles and glass bottles, and can be folded down after use, contributing to volume reduction of garbage.

  As the packaging bag, for example, a packaging bag disclosed in Patent Document 1 is known. The packaging bag of Patent Document 1 is composed of a bottom sheet and a pair of side sheets, and each side edge of the bottom sheet and the side sheets is heated in a state where the folded bottom sheet is sandwiched between the pair of side sheets. It is formed in a bag shape by welding. Further, in the packaging bag of Patent Document 1, columnar reinforcing members are attached to both side edge portions for the purpose of preventing breakage and improving self-supporting property.

JP 2003-191964 A

  By the way, since the said packaging bag is formed from the resin sheet, it has the property that rigidity is low and can be changed easily. While the packaging bag having such properties has an advantage that an empty packaging bag can be folded into a small size when discarded, the packaging bag is easily crushed when the packaging bag is gripped to take out the contents. There is also a problem that the stability of the gripping state is lowered.

  The present invention has been made in view of such conventional circumstances, and an object thereof is to provide a packaging bag having improved stability when gripped.

In order to achieve the above object, the packaging bag according to claim 1 is a packaging bag including a bag body formed in a bag shape having an opening at an upper portion by a resin sheet, and the bag body has both side edges thereof. The fixing structure includes a reinforcing member that is bent so that the parts are close to each other , reinforces both side edge portions of the bag body, and a fixing structure for fixing the bag body in a bent shape. Are provided on the reinforcing member that reinforces the other side edge portion and is engaged with the first engaging portion. A plate-like second engaging portion, and the first engaging portion and the second engaging portion can be bent at the base end portions of the first engaging portion and the second engaging portion. A thin-walled portion is provided .

  According to the above configuration, the bag body is bent, that is, rounded when viewed from above, so that the number of resin sheets overlapping in the thickness direction is increased, and the thickness of the bag body is increased. Directional rigidity is increased. Thereby, when the packaging bag is gripped, the bag body is prevented from being easily crushed, and can be gripped stably while feeling a certain reaction force. Further, as compared with a packaging bag in which the bag body is not bent, the packaging bag having the bag body bent in a bent shape is easily contained in the palm and easily held. Also, the ease of holding the packaging bag improves the stability when the packaging bag is gripped.

Moreover, according to the said structure, the bending shape of a bag main body can be maintained stably.

Moreover, according to the said structure, the bag body is prevented from being folded by the reinforcing member and the self-supporting property of the packaging bag is improved. Furthermore, by providing the fixed configuration and the reinforcing member integrally, the fixed configuration can be easily formed simultaneously with the reinforcing member, and the number of parts for forming the packaging bag can be reduced.

  According to the packaging bag of the present invention, the stability when grasped can be improved.

(A)-(c) is a perspective view of the packaging bag (bending shape) of 1st Embodiment, a top view, and a bottom view, respectively. The disassembled perspective view of the packaging bag of 1st Embodiment. The perspective view of the packaging bag (non-bending shape) of 1st Embodiment. The fragmentary perspective view of the packaging bag (non-bending shape) of 2nd Embodiment. The fragmentary perspective view of the packaging bag (bending shape) of 2nd Embodiment. The perspective view of the packaging bag of 3rd Embodiment. (A) is a perspective view of a fixing member, (b) is a perspective view of another example fixing member. (A)-(c) is a figure which shows the 1st engaging part and 2nd engaging part of another example. (A)-(c) is a figure which shows the 1st engaging part and 2nd engaging part of another example. (A), (b) is a figure which shows the 1st engaging part and 2nd engaging part of another example.

[First Embodiment]
Hereinafter, the packaging bag 1 of 1st Embodiment is demonstrated based on FIGS. 1-3.
The packaging bag 1 according to the first embodiment includes a bag body 10 formed in a bag shape by a resin sheet, a mouthpiece 20 attached to an upper opening of the bag body 10, and a pair of side edge portions attached to the bag body 10. Reinforcing members 30a and 30b are provided.

  As shown in FIG. 2, the bag body 10 includes a horizontally long, substantially rectangular bottom sheet 11 that is folded in two so that the crease faces upward, and a pair of vertically long sheets disposed so as to sandwich the bottom sheet 11. And a rectangular side sheet 12. And as the state which piled up the adhesive part 21 provided in the lower part of the mouthpiece 20, and the bottom sheet 11 folded in half and the pair of side sheets 12, the upper and lower and left and right edges of the side sheet 12 are They are bonded to each other and formed into a bag shape having a mouthpiece 20 (opening) on the upper side.

  Specifically, as shown in FIG. 3, at the upper edge of the bag body 10, the outer surface of the bonding portion 21 of the mouthpiece 20 and the inner surface of the side sheet 12 are bonded together, and the inner surfaces of the side sheets 12 are Bonded with a certain width. At the left and right side edges of the bag body 10, the inner surfaces of the side sheets 12 are bonded to each other with a constant width. At the lower edge of the bag body 10, the inner surface of the side sheet 12 and the outer surface of the bottom sheet 11 are surrounded by a curved line that is recessed in an arc shape in the vertical direction and the left, right, and lower edges of the side sheet 12. Bonded in the area.

  As shown in FIGS. 2 and 3, a pair of reinforcing members 30 a and 30 b are attached to both side edge portions of the bag body 10. Both reinforcing members 30a and 30b are formed in a column shape extending from the end of the upper edge of the bag body 10 along the side edge part, and cover the upper edge and the side edge of the bag body 10 from the outside. It is formed in a U-shape (groove shape). The reinforcing members 30a and 30b are integrally formed with the upper edge and side edge bonding portions of the bag body 10.

  As shown in FIGS. 2 and 3, a first engagement portion 32 having a substantially cylindrical protrusion shape is formed to protrude outward from the upper portion of the back surface of the reinforcing member 30 a on one side. The distal end of the first engagement portion 32 is provided with a diameter-enlarged portion 32a that is expanded from the distal end side toward the proximal end side, and the first engagement portion 32 is formed in an arrow shape as a side view as a whole. (See FIG. 1 (a)). On the other hand, a second engagement portion 33 having a substantially semi-disc shape is formed on the upper surface of the back surface of the reinforcing member 30b on the other side so as to protrude outward. The base end portion of the second engagement portion 33 is formed to be thin and function as a hinge. Further, a through hole 33 a having substantially the same diameter as the maximum diameter portion of the enlarged diameter portion 32 a of the first engagement portion 32 is provided in the central portion of the second engagement portion 33.

Next, the operation of this embodiment will be described.
As shown in FIG. 1, the packaging bag 1 of the present embodiment configured as described above is a bent shape in which the bag body 10 is bent so that the side edge portions approach each other, that is, rounded into a substantially C shape in a top view. In addition, the bent shape can be maintained (fixed). Specifically, both side edge portions of the bag body 10 are bent toward one side sheet 12 constituting the bag body 10 so that the reinforcing members 30a and 30b attached to the both side edge portions are brought close to each other. Then, the first engagement portion 32 provided on the one side reinforcement member 30a is inserted into the through hole 33a of the second engagement portion 33 provided on the other side reinforcement member 30b, so that the first engagement is achieved. The joining portion 32 and the second engaging portion 33 are engaged.

  Thereby, the reinforcing members 30a and 30b are engaged with each other in a close state, and the packaging bag 1 is fixed in a state in which the bag main body 10 is bent as shown in FIG. In the present embodiment, the first engaging portion 32 and the second engaging portion 33 are configured to fix the bag body 10 in a bent shape by engaging the reinforcing members 30a and 30b (first fixing). Composition).

  The side edge portions of the bag body 10 having a bent shape are bent along the edge of the adhesive portion 21 of the mouthpiece 20 at the upper edge portion, and gradually approach toward the lower side. And it has the shape which approaches most in the engagement site | part of the 1st engaging part 32 and the 2nd engaging part 33, and is gradually spaced apart toward the downward side from there. That is, the packaging bag 1 in which the bag body 10 is bent has a large upper side bending degree as shown in FIG. 1 (b) and a lower side bending degree as shown in FIG. 1 (c). It has a conical shape.

  The bent packaging bag 1 has a shape in which the bag main body 10 is rounded when viewed from above, so that the number of side sheets 12 overlapping in the thickness direction increases, and the thickness direction of the bag main body 10 increases. The rigidity of the is increased. Thereby, when the packaging bag 1 is gripped, the bag body 10 is prevented from being easily crushed. In addition, the packaging bag 1 of this embodiment is released from the bent shape shown in FIG. 1 by releasing the engagement state of the first engagement portion 32 and the second engagement portion 33 that are the first fixed configuration. It is also possible to return to the non-bending shape shown in FIG.

Next, the effect in this embodiment will be described below.
(1) The packaging bag 1 is provided with the bag main body 10 formed in the bag shape which has an opening in the upper part with the resin sheet. The bag body 10 has a bent shape in which both side edge portions are bent so as to approach each other.

  According to the above configuration, the number of side sheets 12 overlapping in the thickness direction increases, and the rigidity of the bag body 10 in the thickness direction is increased. Thereby, when the packaging bag 1 is gripped, the bag body 10 is prevented from being easily crushed, and can be gripped stably while feeling a certain reaction force. Further, as compared with the packaging bag 1 in which the bag body 10 has a non-bent shape, the packaging bag 1 in which the bag body 10 has a bent shape and is rounded easily fits in the palm and is easy to hold. Also, the ease of holding the packaging bag 1 improves the stability when the packaging bag 1 is gripped. Furthermore, the self-supporting property of the packaging bag 1 is improved due to the rounded shape. Moreover, the packaging bag 1 in which the bag body 10 has a bent shape has an appearance shape like a bottle in a side view and is excellent in design.

  (2) The first engaging portion 32 and the second engaging portion 33 are provided as a fixing configuration for fixing the bag body 10 in a bent shape. According to the said structure, the bending shape of the bag main body 10 can be maintained stably.

  (3) Reinforcing members 30a and 30b for reinforcing both side edge portions of the bag body 10 are provided. According to the above configuration, the reinforcing members 30a and 30b prevent the bag body 10 from being folded, and the self-supporting property of the packaging bag 1 is improved.

  (4) While providing the 1st engaging part 32 and the 2nd engaging part 33 (1st fixing structure) with respect to the reinforcing members 30a and 30b, the 1st engaging part 32 and the 2nd engaging part 33 are reinforcing members. It is comprised so that 30a, 30b may be engaged. According to the above configuration, the first fixing configuration can be easily formed simultaneously with the reinforcing members 30a and 30b by providing the first fixing configuration integrally with the existing reinforcing members 30a and 30b. . Moreover, the number of parts for forming the packaging bag 1 can be reduced.

  (5) As shown in FIG. 1B, the packaging bag 1 in which the bag body 10 is bent has a side surface of the reinforcing members 30 a and 30 b in the vicinity of the first engaging portion 32 and the second engaging portion 33. They are facing each other. According to the said structure, the bending degree of the bag main body 10 can be enlarged more compared with the structure where the back surfaces of reinforcement member 30a, 30b oppose.

  (6) It is possible to release the fixed state by the first engaging portion 32 and the second engaging portion 33 so that the packaging bag 1 has an unbent shape. According to the above configuration, for example, it is possible to properly use the shape according to the situation such as a non-bending shape in consideration of the storage space during storage and a bent shape that is easy to grip during use. Usability of the packaging bag 1 is improved.

  (7) The bag body 10 fixed in a bent shape has a substantially conical shape with a large degree of bending on the upper side and a small degree of bending on the lower side. According to the said structure, the self-supporting property of the packaging bag 1 further improves.

[Second Embodiment]
Hereinafter, the packaging bag 2 of 2nd Embodiment is demonstrated based on FIG. In addition, this example is embodiment which changed the structure of the fixed structure (1st fixed structure) of 1st Embodiment, Comprising: Other basic structures are the same as 1st Embodiment. Therefore, the same parts are denoted by the same reference numerals, detailed description thereof is omitted, and only different parts will be described.

  As shown in FIG. 4, a flange 22 is provided on the outer peripheral surface of the mouthpiece 20 provided in the packaging bag 2 of the present embodiment, and a third engagement portion 23 is provided on the edge of the flange 22. Yes. The third engaging portion 23 is formed in an L-shaped cross section including a base portion 23a extending from the flange 22 to the side (side surface sheet 12 side) and a distal end portion 23b extending downward from the distal end of the base portion 23a. Then, two engagement protrusions 24 having a substantially cylindrical protrusion shape are formed so as to protrude from the left and right at the center portion on the outer surface side of the distal end portion 23b of the third engagement part 23. The distal end of each engagement protrusion 24 is provided with a diameter-enlarged portion 24a that is expanded from the distal end side toward the proximal end side, and each engagement protrusion 24 is formed in an arrow shape as viewed from the side.

  In addition, on the upper portions of the back surfaces of the reinforcing members 30a and 30b attached to the side edge portions of the bag body 10 of the packaging bag 2, the fourth engaging portions 34 each having a substantially semicircular shape are directed outward. The protrusion is formed. A through hole 34 a having substantially the same diameter as the largest diameter portion of the enlarged diameter portion 24 a of the engagement protrusion 24 provided in the third engagement portion 23 is provided in the central portion of the fourth engagement portion 34.

Next, the operation of this embodiment will be described.
As shown in FIG. 5, the packaging bag 2 of the present embodiment configured as described above has a bent shape in which the bag body 10 is bent so that the side edge portions approach each other, and the bent shape is maintained (fixed). )can do. Specifically, both side edge portions of the bag body 10 are bent toward the side sheet 12 side on which the third engaging portion 23 is provided, and the reinforcing members 30a and 30b attached to the both side edge portions are provided. Move them closer together. And each engagement protrusion 24 of the 3rd engagement part 23 provided in the mouthpiece 20 is inserted in the through-hole 34a of the 4th engagement part 34 provided in both the reinforcement members 30a and 30b, and 3rd The engaging portion 23 and the fourth engaging portion 34 are engaged.

  Accordingly, the reinforcing members 30a and 30b and the mouthpiece 20 are engaged with each other in a state where the reinforcing members 30a and 30b are close to each other, and the packaging bag 1 has the bag body 10 as shown in FIG. Fixed in state. In the present embodiment, the third engaging portion 23 and the fourth engaging portion 34 are configured to fix the bag body 10 in a bent shape by engaging the reinforcing members 30a and 30b and the mouthpiece 20. (Second fixed configuration). Also in the present embodiment, by releasing the engagement state between the third engagement portion 23 and the fourth engagement portion 34 that are the second fixed configuration, the bent shape shown in FIG. It is possible to return to the unbent shape shown.

According to the structure of the packaging bag 2 of 2nd Embodiment, in addition to the effect of (1)-(3), (6), (7) in 1st Embodiment, the effect as described below can be acquired.
(8) The third engaging portion 23 and the fourth engaging portion 34 (second fixed configuration) are provided for the mouthpiece 20 and the reinforcing members 30a and 30b, respectively, and the third engaging portion 23 and the fourth engaging portion are provided. The joint portion 34 is configured to engage the reinforcing members 30 a and 30 b with the mouthpiece 20. According to the above configuration, the second fixing configuration is provided simultaneously with the mouthpiece 20 and the reinforcing members 30a and 30b by providing the second fixing configuration integrally with the mouthpiece 20 and the reinforcing members 30a and 30b which are existing members. Can be easily formed. Moreover, the number of parts for forming the packaging bag 2 can be reduced.

  (9) As shown in FIG. 5, in the packaging bag 2 in which the bag body 10 is bent, the back surfaces of the reinforcing members 30 a and 30 b face each other in the vicinity of the fourth engagement portion 34. According to the said structure, compared with the structure where the side surfaces of reinforcement member 30a, 30b oppose, when the packaging bag 2 is made into a bending shape, the load of the twist direction which acts on each reinforcement member 30a, 30b is reduced. The Therefore, it is possible to select a material with lower flexibility as the material for forming the reinforcing members 30a and 30b, and the degree of freedom in material selection is increased.

[Third Embodiment]
Hereinafter, the packaging bag 3 of 3rd Embodiment is demonstrated based on FIG. In addition, this example is embodiment which changed the structure of the fixed structure (1st fixed structure) of 1st Embodiment, Comprising: Other basic structures are the same as 1st Embodiment. Therefore, the same parts are denoted by the same reference numerals, detailed description thereof is omitted, and only different parts will be described.

  The packaging bag 3 of the present embodiment includes a fixing member 40 configured separately from the bag body 10. As shown in FIG. 6 and FIG. 7A, the fixing member 40 is an annular member formed by adhering both ends of the belt-like sheet, and is arranged above or below the outer periphery of the bent bag body 10. It is a member mounted from the side. As shown in FIG. 6, the bag body 10 to which the fixing member 40 is attached is in a state of being restrained by the fixing member 40 in a bent shape. The bag body 10 is fixed in the bent shape while the movement to return from the bent shape to the non-bent shape is restricted. In the present embodiment, the fixing member 40 has a fixed configuration (third fixed configuration) in which the bag body 10 is fixed in a bent shape by restraining it. Also in this embodiment, it is possible to return the bent shape shown in FIG. 6 to the non-bent shape as shown in FIG. 3 by removing the fixing member 40.

According to the structure of the packaging bag 3 of 3rd Embodiment, in addition to the effect of (1)-(3), (6), (7) in 1st Embodiment, the effect as described below can be acquired.
(10) A fixing member 40 configured separately from the bag body 10 is provided, and the bag body 10 is fixed in a bent shape by restraining the bag body 10 by the fixing member 40. According to the said structure, since the conventional packaging bag can be used as it is, without using the reinforcement members 30a and 30b and the mouthpiece 20 of a special shape, it can manufacture easily.

  Each of the above embodiments can be modified and embodied as follows. Further, the following modifications may be combined with each other, and each of the above embodiments may be changed as in the configuration of the combination.

  -The 1st fixed structure should just be the structure which can engage reinforcement member 30a, 30b, and can fix the bending shape of the bag main body 10, and is not limited to the structure of 1st Embodiment. For example, the first engagement portion 32 and the second engagement portion 33 as the first fixed configuration may be configured to form the engagement relationship shown in FIGS.

  In the example shown in FIG. 8, both the first engaging portion 32 and the second engaging portion 33 are formed in a substantially semicircular disk shape (see FIGS. 8A and 8B). The first engagement portion 32 is provided with a hook portion 32b that protrudes from the side surface on one side and has a shape in which the tip portion is bent inward. Further, the second engagement portion 33 is provided with a through hole 33b through which the tip portion of the hook portion 32b can be inserted.

  In the case of the above configuration, as shown in FIG. 8C, the side edge portions of the bag body 10 are bent toward the side sheet 12 side where the hook portion 32b of the first engagement portion 32 is not formed to protrude. Then, the reinforcing members 30a and 30b attached to the side edge portions are brought close to each other. Then, by inserting the tip end portion of the hook portion 32b provided in the first engagement portion 32 into the through hole 33b of the second engagement portion 33 and hooking the tip portion of the hook portion 32b in the through hole 33b. The first engaging portion 32 and the second engaging portion 33 are engaged.

  In the example shown in FIG. 9, both the first engaging portion 32 and the second engaging portion 33 are formed in a substantially semi-disc shape, and each base end portion is formed thin and functions as a hinge. (See FIGS. 9A and 9B). A through hole 32c is provided in the central portion of the first engaging portion 32, and an engaging protrusion 33c protruding from one side surface is provided in the central portion of the second engaging portion 33. The diameter of the through hole 32c is set to be approximately the same as the outer diameter of the engaging protrusion 33c.

  In the case of the above configuration, as shown in FIG. 9C, the side edge portions of the bag body 10 are bent toward the side sheet 12 side where the engagement protrusions 33c of the second engagement portion 33 are not formed to protrude. Then, the reinforcing members 30a and 30b attached to the side edge portions are brought close to each other. And while each base end part of the 1st engaging part 32 and the 2nd engaging part 33 is curved, the engaging protrusion 33c of the 2nd engaging part 33 with respect to the through-hole 32c of the 1st engaging part 32 By engaging, the first engaging portion 32 and the second engaging portion 33 are engaged.

  The example shown in FIG. 10 is an example in which the shapes of the through holes 32c of the first engagement portion 32 and the engagement protrusions 33c of the second engagement portion 33 in the example shown in FIG. 9 are changed. As shown to Fig.10 (a), the through-hole 32c of the 1st engaging part 32 of this example is formed in the rectangular shape. A groove portion 32 d that is continuous with the through hole 32 c is provided at the tip portion of the side surface on one side of the first engagement portion 32. As shown in FIG. 10 (b), the second engaging portion 33 of this example has a distal end portion formed in a rectangular shape having substantially the same shape as the through hole 32c. And the whole rectangular front-end | tip part is formed thickly, and comprises the engagement protrusion 33c. In addition, the thickness of the base end portion 33d excluding the hinge-like thin portion in the second engagement portion 33 is set to be substantially the same as the depth of the groove portion 32d of the first engagement portion 32, and at the engagement protrusion 33c. The thickness of a certain tip portion is set to be substantially the same as the thickness of the first engaging portion 32 in which the through hole 32c is formed.

  In the case of the above configuration, the engaging protrusion 33c of the second engaging portion 33 with respect to the through hole 32c of the first engaging portion 32, as in the example shown in FIG. 9 (see FIG. 9C). By engaging, the first engaging portion 32 and the second engaging portion 33 are engaged. At this time, the engaging protrusion 33 c of the second engaging portion 33 is accommodated in the through hole 32 c without protruding from the through hole 32 c of the first engaging portion 32. Therefore, when the packaging bag 1 is gripped, the engagement protrusion 33c portion is prevented from hitting the hand and can be gripped suitably. Further, when the first engagement portion 32 and the second engagement portion 33 are engaged, the base end portion 33 d of the second engagement portion 33 is accommodated in the groove portion 32 d of the first engagement portion 32. Therefore, the thickness of the entire engaging portion can be further reduced. Furthermore, when the thickness of the first engaging portion 32 and the second engaging portion 33 is set to be smaller than the thickness of the reinforcing members 30a and 30b, a large number of non-flexible packaging bags 1 are stacked and stored. The first engaging portions 32 or the second engaging portions 33 do not interfere with each other, and can be suitably stacked.

  -In 1st Embodiment, although the 1st fixed structure was arrange | positioned at the upper part of reinforcement member 30a, 30b, you may arrange | position a 1st fixed structure in the center part or lower part of reinforcement member 30a, 30b. In addition, a plurality of sets of first fixed structures may be arranged side by side with respect to the reinforcing members 30a and 30b.

  The second fixing configuration may be any configuration that can fix the bent shape of the bag body 10 by engaging the reinforcing members 30a and 30b with the mouthpiece 20, and is limited to the configuration of the second embodiment. is not. For example, it is good also as a structure which provides an engaging protrusion in the 4th engaging part 34 side while providing a through-hole in the 3rd engaging part 23 side. Moreover, you may employ | adopt an engagement structure as shown to FIGS.

  -A 3rd fixing structure should just be a structure which can fix the bending shape of the bag main body 10 by restraining the bag main body 10, and is not limited to the structure of 3rd Embodiment. For example, a label that displays the product content or the like attached to the surface of the packaging bag 1 may be used as the fixing member 40. Further, the configuration of the fixing member 40 as the third fixing configuration is not limited to the annular sheet member as shown in FIG. 7A, and for example, a string-like shape as shown in FIG. It may be a member.

  -A fixed structure should just be a structure which can fix the bending shape of the bag main body 10, and is not limited to the 1st-3rd fixed structure. For example, holes are provided in the bonding portions on both side edges of the bag body 10, the holes are connected by an annular member or a string, and the bag body 10 is bent into a bent shape by engaging both side edge portions of the bag body 10. It is good also as a structure fixed.

-It is good also as a structure which can adjust the bending degree of the bag main body 10 fixed by a fixed structure in steps, by notching the site | part which comprises a fixed structure.
In each embodiment, the bag body 10 is configured to be deformable from a bent shape to a non-bent shape, but may be configured to be unable to be deformed to a non-bent shape. For example, the bag body 10 is formed by fixing the reinforcing members 30a and 30b, the mouthpiece 20 and the reinforcing members 30a and 30b, or the adhesive portions of both side edges of the bag body 10 together by an adhesive or welding. It is good also as a structure which can take only a bending shape.

-For example, a plurality of types of fixed configurations may be provided in combination such that the first fixed configuration and the second fixed configuration are provided simultaneously.
The overall shape of the packaging bag 1 in which the bag body 10 is bent is not limited to a substantially conical shape. For example, a cylindrical shape with the same degree of bending in the upper and lower sides may be used, or a substantially inverted conical shape with a lower degree of bending toward the upper side.

  The bent shape of the bag body 10, that is, the bent shape that is bent so that both side edge portions approach each other, is not only a shape that is rounded into a substantially C shape when viewed from above, but each side edge portion is further inside Alternatively, it is a concept including a shape that is bent outward (for example, an Ω-shape or an S-shape).

-It is good also as a structure which does not provide a fixed structure. For example, the bag body 10 itself may be formed in a bent shape from the beginning using the side sheets 12 having different widths.
-The bag main body 10 should just be formed in the bag shape which has an opening in the upper part with a resin sheet, and the specific structure of each resin sheet which comprises the bag main body 10 is not specifically limited. For example, the bottom sheet 11 may be omitted and the bag body 10 may be formed from only a pair of side sheets 12. Note that having an opening in the upper portion is not limited to a configuration in which an opening is formed in the upper edge portion of the bag body 10, and a portion that becomes an opening with respect to the upper portion of the side sheet 12 is formed. It is a concept that includes the structure.

  In the case where the mouthpiece 20 and the reinforcing members 30a and 30b are not used as a fixed configuration as in the third embodiment, the mouthpiece 20 and the reinforcing members 30a and 30b can be omitted as appropriate.

Next, a technical idea that can be grasped from the above embodiment and another example will be described.
(A) A reinforcing member that reinforces both side edge portions of the bag body is provided, and the fixing structure is provided in the reinforcing member, and the bag body is fixed in a bent shape by engaging the reinforcing members with each other. Said packaging bag.

  (B) a mouthpiece attached to the opening of the bag body and a reinforcing member that reinforces both side edge portions of the bag body, and the fixing structure is provided on the mouthpiece and the reinforcing member, and the mouth The packaging bag for fixing the bag body in a bent shape by engaging the reinforcing member with a tool.

(C) The packaging bag including a fixing member that restrains the bag body in a bent shape as the fixing configuration.
(D) The packaging bag capable of releasing the fixed state by the fixing configuration and making the bag body into an unbent shape.

  1, 2, 3 ... packaging bag, 10 ... bag body, 11 ... bottom sheet, 12 ... side sheet, 20 ... mouthpiece, 21 ... adhesive part, 23 ... third engagement part, 30a, 30b ... reinforcing member, 32 ... 1st engaging part, 33 ... 2nd engaging part, 34 ... 4th engaging part, 40 ... fixing member.

Claims (1)

A packaging bag comprising a bag body formed into a bag shape having an opening at the top by a resin sheet,
The bag body has a bent shape that is bent so that both side edge portions are close to each other ,
A reinforcing member for reinforcing both side edge portions of the bag body, and a fixing structure for fixing the bag body in a bent shape,
The fixed structure is provided in the plate-like first engaging portion provided in the reinforcing member that reinforces one side edge portion, and in the reinforcing member that reinforces the other side edge portion, and the first engaging portion And a plate-like second engaging portion that engages with,
The base end portions of the first engagement portion and the second engagement portion are provided with thin portions that allow the first engagement portion and the second engagement portion to be bent. Packaging bag .