WO2021177109A1

WO2021177109A1 - Packaging bag

Info

Publication number: WO2021177109A1
Application number: PCT/JP2021/006854
Authority: WO
Inventors: 有麻新畑; 友理北下
Original assignee: 株式会社パックプラス
Priority date: 2020-03-03
Filing date: 2021-02-24
Publication date: 2021-09-10
Also published as: JP2021138451A

Abstract

The purpose of the present invention is to provide a packaging bag that can reduce occurrence of cracks in a bottom surface member. A flexible packaging bag 1 comprises a pair of opposed front and back plane surface members 111 and a bottom surface member 112 provided at lower parts of the plane surface members 111, wherein upper edge parts 111a, left edge parts 111b, and right edge parts 111c of the plane surface members 111 are respectively welded to each other, lower edge parts 111b of the plane surface members 111 and a peripheral edge part 112a of the bottom surface member 112 are welded to each other, and a fluid is filled. The plane surface members 111 and the bottom surface member 112 are configured so that a maximum opening area S1 of the lower edge parts 111b of the plane surface members 111 becomes smaller than a surface area S2 of the bottom surface member 112 when the fluid is filled in the packaging bag 1 in a full state.　

Description

Packaging bag

The present invention relates to a packaging bag in which a fluid is filled.

Conventionally, rigid plastic packaging containers have generally been used in products that handle various fluids such as cosmetics, shampoos, soaps, and perm solutions. And, in consideration of the environment for the earth, even after all the fluid is discharged from the plastic packaging container, the plastic packaging container is maintained without being discarded, and it is made into a flexible packaging bag for refilling. The contained fluid is refilled in plastic packaging.

Also, in recent years, flexible packaging bags have been used not as refills but as the main body of products. More specifically, a fluid discharge container including a packaging bag filled with fluid, a connector provided in the packaging bag, and a discharge mechanism such as a pump connected to the connector is known.

These packaging bags are composed of a pair of front and back flat members facing each other and a bottom member provided below the flat member, and the inside surrounded by the flat member and the bottom member is filled with a predetermined fluid. Pouch is often used (see, for example, Patent Document 1).

JP-A-2019-43568

However, in the conventional packaging bag, when the fluid is filled, the bottom member is greatly deformed from the folded state to the linearly stretched state, so that the degree of plastic deformation is large. Further, when the packaging bag is transported, the bottom member is repeatedly in a stretched state and a loosened state, so that plastic deformation is likely to occur. Further, when the fluid is discharged from the packaging bag, the bottom member is greatly deformed from the stretched state to the folded state, so that the degree of plastic deformation is large. In this way, in the conventional packaging bag, the bottom member repeats plastic deformation when the packaging bag is filled with the fluid, when the packaging bag is transported, and when the fluid is discharged from the packaging bag, so that damage is accumulated on the bottom member. There is a problem that the bottom surface member is easily cracked.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a packaging bag capable of reducing cracks in the bottom member.

In order to achieve the above object, the present invention comprises a pair of front and back flat members and a bottom member provided below the flat members, and the upper edges of the flat members, the right edges and the right edges of the flat members are formed. A flexible packaging bag in which the left edge portions are welded to each other and the lower edge portion of the flat surface member and the peripheral edge portion of the bottom surface member are welded to each other and the inside is filled with fluid. The bottom surface member is characterized in that it is configured in a shape satisfying the condition of the following formula [1].

S1 <S2 ... [1]
S1: Maximum opening area of the lower edge of the flat member when the inside of the packaging bag is filled with fluid S2: Surface area of the bottom member (excluding the welded portion)

According to this, when the inside of the packaging bag is filled with the fluid, the maximum opening area of the lower edge of the flat member is smaller than the surface area of the bottom member, so that the packaging bag is filled with the fluid before filling. Since it stays in the state before it is completely stretched after being filled with the fluid from the folded state, the degree of plastic deformation is smaller than that of the conventional packaging bag. Further, when the packaging bag is transported, the bottom member is in a loosened state, so that plastic deformation is unlikely to occur. Further, when the fluid is discharged from the packaging bag, the bottom member is deformed from the loosened state to the folded state, so that the degree of plastic deformation is smaller than that of the conventional packaging bag. In this way, when the packaging bag is filled with fluid, when the packaging bag is transported, and when the fluid is discharged from the packaging bag, plastic deformation is less likely to occur in the bottom member, so that damage is less likely to accumulate in the bottom member, and the bottom member is less likely to accumulate. It is possible to reduce the occurrence of cracks in the bag.

Further, the flat member and the bottom member are preferably configured in a shape satisfying the conditions of the following formula [2], and more preferably the conditions of the following formulas [3] and [4].

S2 × 0.1 <S1 <S2 × 0.9 ... [2]
S2 × 0.1 <S1 <S2 × 0.8 ... [3]
S2 × 0.2 <S1 <S2 × 0.8 ... [4]

According to this, the flat member and the bottom member are filled in the packaging bag by being formed in a shape satisfying the condition of S2 × 0.1 <S1, more preferably S2 × 0.2 <S1. It is possible to secure a sufficient capacity of the fluid and to place the packaging bag in a stable state. Further, by forming the flat surface member and the bottom surface member in a shape satisfying the condition of S1 <S2 × 0.9, more preferably S1 <S2 × 0.8, the bottom surface member is surely cracked. It can be mitigated.

Further, the bottom surface member is configured to be deformed in a chevron shape in advance toward the inside of the packaging bag with respect to the front and back directions of the flat member when the inside of the packaging bag is filled with fluid. You may. Further, the bottom surface member may be configured such that when the inside of the packaging bag is filled with fluid, the central portion of the flat surface member in the front-back direction projects toward the inside of the packaging bag. ..

Further, in the flat member, the lower edge portions may be welded to each other on both side portions in the width direction. For example, the flat member may be one in which lower edge portions are welded to each other at both ends in the width direction. Alternatively, the flat member may be one in which the lower edge portions are welded to each other on the inner side in the width direction with respect to the welded portions of the left side edge portions and / or the right side edge portions. According to this, it becomes easy to construct a flat member and a bottom member satisfying the conditions of the above equations [1], [2], and [3].

Further, in the flat member, the lower edge portions are welded to each other at a position inside the welding portion of the left edge portions and / or the right edge portions in the width direction and satisfy the condition of the following formula [3]. May be good. According to this, it is possible to secure a sufficient capacity of the fluid to be filled inside the packaging bag, and it is possible to place the packaging bag in a stable state.

K1 <K × 1/3 ... [4]
K1: Distance from the widthwise outer position of the widthwise end of the lower edge portion of the flat member to the widthwise inner position of the welded portion between the lower edge portions K: The most of the lower edge portion of the flat surface member. Significantly

Further, the packaging bag according to the present invention may be provided with a connector. According to this, it is possible to provide a packaging bag with a connector that reduces the occurrence of cracks in the bottom surface member.

Further, the packaging bag according to the present invention may be provided with a spout or the like. According to this, it is possible to provide a packaging bag with a spout that reduces the occurrence of cracks in the bottom member.

Further, the fluid discharge container according to the present invention includes a packaging bag, a connector provided on the packaging bag, and a discharge mechanism connected to the connector, and is filled inside the packaging bag by the discharge mechanism. It is characterized by discharging a fluid. According to this, it is possible to reduce the occurrence of cracks in the bottom member of the packaging bag, and it is possible to provide a high-quality fluid discharge container.

According to the present invention, when the inside of the packaging bag is filled with the fluid, the maximum opening area of the lower edge portion of the flat member is smaller than the surface area of the bottom member, so that the packaging bag is filled with the fluid before filling. Since it stays in the state before it is completely stretched after the fluid is filled from the folded state, the degree of plastic deformation is smaller than that of the conventional packaging bag. Further, when the packaging bag is transported, the bottom member is in a loosened state, so that plastic deformation is unlikely to occur. Further, when the fluid is discharged from the packaging bag, the bottom member is deformed from the loosened state to the folded state, so that the degree of plastic deformation is smaller than that of the conventional packaging bag. In this way, when the packaging bag is filled with fluid, when the packaging bag is transported, and when the fluid is discharged from the packaging bag, plastic deformation is less likely to occur in the bottom member, so that damage is less likely to accumulate in the bottom member, and the bottom member is less likely to accumulate. It is possible to reduce the occurrence of cracks in the bag.

It is an exploded perspective view of the fluid discharge container which concerns on embodiment of this invention. It is a front sectional view of the fluid discharge container. It is a perspective view of the packaging bag (after fluid filling) of FIG. It is a front sectional view of the packaging bag (after fluid filling) of FIG. It is a side sectional view of the packaging bag (after fluid filling) of FIG. It is a bottom view of the packaging bag (after fluid filling) of FIG. It is a front view of the packaging bag (before fluid filling) of FIG. It is an exploded perspective view of the packaging bag of FIG. It is a side sectional view of the packaging bag which shows the process of discharging the fluid inside the fluid discharge container. It is a side sectional view of the fluid discharge container (after fluid filling) which concerns on another embodiment. It is a bottom view of the fluid discharge container (after fluid filling) of FIG. It is a partial front view which shows the welding position of the lower edge part of a packaging bag, and the deformation example of a welding shape. It is a lower front view which shows (a) the conventional product and (b) the product of this invention which concerns on the evaluation experiment of a packaging bag. It is a photograph which shows the evaluation experiment of a packaging bag. It is a table which shows the evaluation result of (a) the conventional product and (b) the product of this invention of a packaging bag.

Next, an embodiment of the fluid discharge container (hereinafter referred to as the present container) according to the present invention will be described with reference to FIGS. 1 to 9. In the present embodiment, the direction orthogonal to the flat member 111 of the packaging bag 1 (bag body 11) is the front-back direction, the vertical length direction of the flat member 111 is the vertical direction, and the horizontal width direction of the flat member 111 is left and right. It will be explained as a direction.

As shown in FIGS. 1 and 2, the present container includes a packaging bag 1 filled with a fluid such as shampoo, rinse, and cosmetic liquid, a lower container 2 in which the packaging bag 1 is stored, and a lower container 2. An upper container 3 provided in the opening 23 so as to be removable, and a discharge mechanism 4 provided in the upper container 3 are provided.

As shown in FIG. 2, the packaging bag 1 is stored in the lower container 2 while contracting in the radial direction. Therefore, the left edge portion 111c and the right edge portion 111d are bent, so that the left edge portion 111c and the right side edge portion 111d are bent. The cross-sectional width of the portion 111c and the right edge portion 111d is shown in a narrow state. Further, although the flat member 111 and the bottom member 112 of the bag 11 are very thin sheet members, they are shown with a thickness for convenience of explanation.

As shown in FIG. 3, the packaging bag 1 is composed of a flexible bag body 11 made of a synthetic resin material generally called a standing pouch, and a rigid connector 12 made of the synthetic resin material.

As shown in FIGS. 7 and 8, the bag 11 is composed of a pair of front and back

flat members

111 and 111 facing each other and a single bottom member 112 provided below the

flat members

111 and 111. The space surrounded by the

flat members

111 and 111 and the bottom member 112 is filled with fluid.

The flat member 111 has a substantially trapezoidal shape in which the upper edge portion 111a is shorter than the lower edge portion 111b, and is composed of a sheet member having a sealant layer on the inner surface side. The edge portions 111c and the right edge portions 111d are welded to each other with a predetermined welding width.

More specifically, as shown in FIG. 4, the upper edge portions 111a of the flat member 111 are welded to each other with a predetermined welding width except for the central portion where the connector 12 is located. Further, the left side edge portions 111c and the right side edge portions 111d of the flat member 111 are welded to each other with a predetermined welding width K2 at the upper portion and the intermediate portion other than the lower portion where the peripheral portion 112a of the bottom surface member 112 is welded, as will be described later. It is welded. Further, the lower edge portions 111b of the flat member 111 are partially welded to each other at the welded portions M having a predetermined welding width K1 at both end portions 111f in the width direction. In FIG. 4, the welded portion between the flat members 111 is a gray portion.

Further, the flat members 111 are in close contact with each other before being filled with the fluid, and as shown in FIG. 3, after being filled with the fluid, they are separated from each other in the front-back direction and gently swell. It becomes a state. In particular, as shown in FIG. 6, the lower edge portion 111b of the flat member 111 is in a state of swelling so as to gradually open in the front-back direction from the left side edge portion 111c and the right side edge portion 111d to the central portion after being filled with the fluid. become.

As shown in FIG. 6, the maximum opening area S1 of the lower edge portion 111b of the flat member 111 is the most of the lower edge portion 111b of the flat member 111 because the inside of the bag 11 is filled with fluid. This is the maximum opening area (shaded area) in the plane direction when opened.

As shown in FIGS. 7 and 8, the bottom surface member 112 has a shape corresponding to the lower portion of the flat surface member 111, is composed of a sheet member having a sealant layer on the inner surface side, and the peripheral edge portion 112a is a flat surface member. It is welded to the left side edge portion 111c, the right side edge portion 111d, the lower edge portion 111b, etc. of 111 at the gray portion in FIG. A welding line 112b that draws an arc is configured.

Further, the bottom surface member 112 is formed with notch holes 112d having a predetermined shape at each of the four corners. Therefore, the lower edge portions 111b of the flat member 111 can be directly welded to each other at the welded portion M at the position corresponding to the notch holes 112d of both end portions 111f.

Further, as shown in FIG. 7, the bottom surface member 112 has a folding line 112c of the bottom surface member 112 (at the center of the bottom surface member 112 in the front and back directions) before the inside of the bag body 11 is filled with the fluid. The line extending in the left-right direction) is folded into the inside of the bag 11, and after the inside of the bag 11 is filled with the fluid, the bag 11 is opened in the front-back direction. Specifically, when the bottom member 112 is filled with fluid inside the bag body 11, as shown in FIG. 4, the bottom surface member 112 is substantially downward from the left side edge portion 111c and the right side edge portion 111d to the center portion. It has a trapezoidal shape and, as shown in FIG. 5, has a chevron shape in the front and back directions, and as shown in FIG. 6, the bottom surface member 112 as a whole has a substantially leaf shape in a plane view.

As shown in FIG. 8, the surface area S2 of the bottom member 112 is the surface area of the portion (white portion) excluding the welded portion (gray portion) of the bottom member 112. In FIG. 8, only half of the surface area S2 of the bottom surface member 112 is shown, and twice the white portion of the bottom surface member 112 shown is the surface area S2 of the bottom surface member 112.

Here, the relationship between the maximum opening area S1 of the lower edge portion 111b of the flat surface member 111 and the surface area S2 of the bottom surface member 112 will be described.

In the present invention, the flat member 111 and the bottom member 112 of the bag 11 are configured to have a shape satisfying the condition of the following formula [1]. In particular, in the present embodiment, the bottom member 112 of the bag 11 is deformed in a mountain shape in advance toward the inside of the bag 11 with respect to the front and back directions of the flat member 111.

S1 <S2 ... [1]
S1: Maximum opening area of the lower edge portion 111b of the flat member 111 when the inside of the packaging bag 1 (bag body 11) is filled with fluid S2: Surface area of the bottom member 112 (excluding the welded portion)

According to this, the maximum opening area S1 of the lower edge portion 111b of the flat member 111 when the inside of the packaging bag 1 is filled with the fluid is smaller than the surface area S2 of the bottom member 112. In No. 1, the degree of plastic deformation is smaller than that of the conventional packaging bag because it stays in the state before being completely stretched after the fluid is filled from the folded state before the fluid is filled. Further, when the packaging bag 1 is transported, the bottom member 112 is in a loosened state, so that plastic deformation is unlikely to occur. Further, when the fluid is discharged (discharged) from the packaging bag 1, the bottom surface member 112 is deformed from the loosened state to the folded state, so that the degree of plastic deformation is smaller than that of the conventional packaging bag. In this way, when the packaging bag 1 is filled with the fluid, when the packaging bag 1 is transported, and when the fluid is discharged from the packaging bag 1, the bottom member 112 is less likely to undergo plastic deformation, so that damage is accumulated on the bottom member 112. It becomes difficult, and it is possible to prevent or reduce the occurrence of cracks in the bottom member 112.

Further, in the present embodiment, as a means for satisfying the condition of the above equation [1], the lower edge portions 111b of the flat member 111 are welded together at both end portions 111f in the width direction by a substantially semicircular welded portion M. ing. Specifically, in a normal standing pouch, the lower edge portions 111b of the flat surface member 111 are not welded to each other at both end portions 111f, so that the lower edge portion 111b of the flat surface member 111 is in the front-back direction of the flat surface member 111. It is in a state where it is easy to open. On the other hand, as shown in FIGS. 6 and 7, when the lower end portions 111b of the flat surface member 111 are welded together at both end portions 111f at the welded portion M, the lower edge portion 111b of the flat surface member 111 becomes the flat surface member 111. It becomes difficult to open in the front and back directions of, and it becomes easy to satisfy the condition of the above equation [1]. In FIG. 6, the state in which the sealant layer of the flat member 111 is melted out by welding between both end portions 111f of the lower end portion 111b of the flat member 111 is shown in gray.

The connector 12 includes a main body 121, an upper connector plate 122 provided on the upper side of the main body 121 in the axial direction, a lower connector plate 123 provided on the lower portion of the main body 121 in the axial direction, and a main body 121. The through hole 124 is provided so as to penetrate the through hole 124 in the axial direction, and the lid member 125 provided at the lower end portion of the through hole 124 is provided, and the lower side surface of the main body portion 121 is sandwiched between the flat members 111 by a heat seal. By being worn, the through hole 124 is provided in the central portion of the upper edge portion 111a of the bag body 11 in such a manner that the axial directions of the bag body 11 coincide with each other.

As shown in FIG. 3, the upper connector plate 122 is formed in a flat plate shape extending in the plane direction, and two recesses 122b recessed inward in the radial direction are formed so as to face each other. On the other hand, the lower connector plate 123 of the connector 12 is also formed in a flat plate shape extending in the plane direction like the upper connector plate 122 of the connector 12, and the two recesses 123b recessed inward in the radial direction are formed. They are formed so as to face each other. The recess 122b of the upper connector plate 122 and the recess 123b of the lower connector plate 123 are formed so as to be flush with each other along the axial direction, and the fingers of the worker's hand (for example, the index finger and the thumb) are recessed. By aligning 122b and 123b, the connector 12 can be easily picked up. Twice

Further, the lower connector plate 123 is formed so that the maximum outer diameter is larger than the inner diameter of the opening 23 of the lower container 2. As a result, as shown in FIG. 2, when the packaging bag 1 is stored in the lower container 2, the lower surface of the peripheral edge portion 123a of the lower connector plate 123 and the upper end surface of the lower container 2 come into contact with each other. The connector 12 of 1 is locked by the opening 23 of the lower container 2, and the bag body 11 of the packaging bag 1 is suspended inside the lower container 2.

Further, the upper connector plate 122 and the lower connector plate 123 are formed so that the maximum outer diameter is smaller than the inner diameter of the upper container 3. As a result, as shown in FIG. 2, when the upper container 3 is completely attached to the lower container 2 with the packaging bag 1 stored in the lower container 2, the entire connector 12 is the internal space 33 of the upper container 3. It will be in a state where it fits in.

Further, the upper connector plate 122 and the lower connector plate 123 are provided so as to face each other with a predetermined distance in the axial direction of the connector 12. As a result, when the packaging bag 1 is filled with the fluid at the time of manufacturing, a locking member separately provided between the upper connector plate 122 and the lower connector plate 123 of the connector 12 of the packaging bag 1 is locked. The fluid can be stably filled.

As shown in FIGS. 1 and 2, the lower container 2 is made of a synthetic resin including a circular bottom wall portion 21 and a cylindrical peripheral wall portion 22 erected from the peripheral edge of the bottom wall portion 21. It is a rigid container, and an opening 23 is formed in the upper portion of the peripheral wall portion 22, and a male screw portion 24 is formed in the outer peripheral surface of the upper portion of the peripheral wall portion 22. The male screw portion 24 is screwed with the female screw portion 34 of the upper container 3 as described later.

As shown in FIGS. 1 and 2, the upper container 3 is a rigid container made of synthetic resin composed of a circular top wall portion 31 and a cylindrical peripheral wall portion 32 hanging from the peripheral edge of the top wall portion 31. The internal space 33 that covers the connector 12 of the packaging bag 1 is formed.

Further, in the upper container 3, a female screw portion 34 is formed on the inner peripheral surface of the lower portion of the peripheral wall portion 32, and the lower container 2 is screwed with the male screw portion 24 formed on the lower container 2. It is attached to.

Further, the upper container 3 has a through hole 35 formed in the central portion of the top wall portion 31, and when the discharge mechanism 4 is attached to the upper container 3, the male member 41 of the discharge mechanism 4 opens the through hole 35. It is supposed to penetrate.

Further, in the upper container 3, a step portion 36 having an L-shaped cross section in the axial direction is formed along the circumferential direction in the upper part of the peripheral wall portion 32. Therefore, as shown in FIG. 2, when the upper container 3 is completely attached to the lower container 2 with the packaging bag 1 stored in the lower container 2, the upper surface of the peripheral edge portion 123a of the lower connector plate 123 Is in contact with the lower surface of the step portion 36 of the upper container 3, and the lower surface of the peripheral edge portion 123a of the lower connector plate 123 is in contact with the upper end surface of the peripheral wall portion 22 of the lower container 2. It can be fixed in a state of being sandwiched between the lower container 2.

As shown in FIGS. 1 and 2, the discharge mechanism 4 employs a so-called push-type pump, and is provided on the top wall portion 31 of the upper container 3. The discharge mechanism 4 has a tubular male member 41 having a suction port 44 for sucking fluid at the lower end portion, a pump portion 42 having a discharge port 45 for discharging fluid at the upper end portion, and a suction port in a manner of penetrating the inside. It has a fluid passage 43 communicating with the discharge port 45 and the discharge port 45.

Further, as shown in FIG. 2, in the discharge mechanism 4, when the upper container 3 is attached to the lower container 2, the male member 41 is inserted into the through hole 124 of the connector 12 of the packaging bag 1 in close contact with the packaging. By extruding the lid member 125 provided at the lower end of the through hole 124 of the connector 12 of the bag 1, the bag 1 faces the inside of the bag body 11. As a result, when the pump portion 42 is pushed down by the operator once or a plurality of times, the fluid filled in the bag 11 is sucked from the suction port 44 of the male member 41 by the suction action of the pump, and the fluid passage 43 is sucked. It can be discharged to the outside of the container from the discharge port 45 through the discharge port 45. ‥

Thus, as shown in FIG. 9A, when the inside of the bag 11 is filled with the fluid, the fluid filled inside the bag 11 by the discharge mechanism 4 is filled with the outside air. When the fluid is discharged while being sucked in an airtight state without being replaced with, as shown in FIG. 9B, as the flat members 111 of the bag 11 approach each other, the bottom member 112 of the bag 11 becomes a bag. The bag body 11 is deformed while being gradually folded into a chevron shape toward the inside of the body 11, and finally, as shown in FIG. 9 (c), the flat members 111 of the bag body 11 are in close contact with each other. At the same time, the bottom member 112 of the bag 11 is deformed so as to be in close contact with each other. Note that, in FIG. 9, only the packaging bag 1 is shown, and other mechanisms are omitted.

<Evaluation experiment>
An evaluation experiment was conducted on the packaging bag according to the present invention as follows.

(Evaluation target)
As shown in Table 1 below, a conventional packaging bag (conventional product: see FIG. 13 (a)) and a packaging bag according to the present invention (product of the present invention: see FIG. 13 (b)) were prepared.

The sample of the product of the present invention and the sample of the conventional product have the following common conditions.
-Packaging bag dimensions (mm): width 105 x height 200 x gusset 32
-Film composition: PET / NY / AL / LLDPE
・ Fluid filling amount: Approximately 200 g

(Evaluation method)
As shown in FIG. 14, for both the product of the present invention and the conventional product, a total of 14 bags of samples are packed in a packaging box in a state of 7 bags × 2 rows, and the packaging box is subjected to a vibration test under the following conditions. rice field.
-Equipment used: Transport packaging testing machine BF-50UT (manufactured by IDEX)
-Frequency: 10Hz to 25Hz (set to 3.2G at 25Hz)
・ Number of cycles: 5 minutes x 12 times

(Evaluation results)
As shown in FIG. 15A, in the conventional product, cracks were generated on the bottom surface of a total of 7 bags of

samples

1, 3, 8, 9, 11, 13, and 14. On the other hand, as shown in FIG. 15B, in the product of the present invention, cracks were generated on the bottom surface of only one bag of sample 14. From this evaluation result, it was confirmed that the product of the present invention is less likely to cause cracks in the bottom member than the conventional product.

In the present embodiment, the flat member 111 and the bottom member 112 of the bag 11 are formed in a shape satisfying the condition of the above formula [1], but preferably the condition of the lower formula [2]. More preferably, it is formed in a shape satisfying the conditions of the following equations [3] and [4].

Further, in the flat member 111, the lower edge portions 111b are welded to each other at the welded portions M of both end portions 111f, but as shown in FIG. 12, the lower edge portions 111b are welded to each other at the left side edge portion 111c and /. Alternatively, it may be welded at the welded portion M inside the welded portion of the right edge portion 111d in the width direction.

In this case, the flat member 111 has a welded portion at a position where the lower edge portion 111b is inside the welded portion of the left side edge portion 111c and / or the right side edge portion 111d in the width direction and satisfies the requirement of the following formula [5]. It is preferably welded with M.

K1 <K x 1/3 ... [5]
K1: Distance from the widthwise outer position of the widthwise end 111f of the lower edge portion 111b of the flat surface member 111 to the widthwise inner position of the welded portion M of the lower edge portion 111b K: The lower edge of the flat surface member 111 Maximum width of part 111b (empty state before fluid is filled inside the bag 11 shown in FIG. 7)

Further, the welded portion M of the lower edge portion 111b of the flat member 111 is formed in a substantially semicircular shape, but as shown in FIG. 12, it has other shapes such as a circular shape, a triangular shape, and a semicircular shape. May be good.

Further, as shown in FIGS. 10 and 11, the central portion of the bottom member 112 of the bag 11 in the front-back direction is configured to project toward the inside of the bag 11 along the folding line 112c. You may.

Further, as a means for satisfying the condition of the above equation [1] in the flat member 111 and the bottom member 112, the lower edge portions 111b of the flat member 111 are welded to each other on both side portions such as both end portions 111f in the width direction. Other means may be used as long as the condition of the above equation [1] is satisfied.

Further, although the lower container 2 and the upper container 3 are provided, the lower container 2 and the upper container 3 are not provided, and only the packaging bag 1 (bag body 11 and connector 12) and the discharge mechanism 4 are provided. Only 1 (bag body 11 and connector 12) may be composed of only the bag body 11. Further, in the bag body 11, a spout or the like may be provided instead of the connector 12.

Further, although the pair of flat members 111 and the bottom member 112 are separate members, the same welding as described above may be performed on a member in which the pair of flat members 111 and the bottom member 112 are composed of one sheet member.

Although the embodiments of the present invention have been described above with reference to the drawings, the present invention is not limited to those of the illustrated embodiments. Various modifications and modifications can be made to the illustrated embodiment within the same range as the present invention or within the same range.

1 ... Packaging bag 11 ... Bag body 111 ... Flat member 111a ... Upper edge 111b ... Lower edge 111c ... Left edge 111d ... Right edge 111f ... End 112 ... Bottom member 112a ... Peripheral 112b ... Welding wire 112c ... Folding wire 12 ... Connector 121 ... Main body 122 ... Upper connector plate 123 ... Lower connector plate 124 ... Through hole 125 ... Lid member 2 ... Lower container 21 ... Bottom wall 22 ... Peripheral wall 23 ... Opening 24 ... Male Screw part 3 ... Upper container 31 ... Top wall part 32 ... Peripheral wall part 33 ... Internal space 34 ... Female screw part 35 ... Through hole 36 ... Step part 4 ... Discharge mechanism 41 ... Male member 42 ... Pump part 43 ... Fluid passage 44 ... Suction port 45 ... Discharge port

Claims

It is composed of a pair of front and back flat members facing each other and a bottom member provided below the flat member, and the upper edges of the flat members, the right edges and the left edges are welded to each other, and the flat members are welded to each other. A flexible packaging bag in which the lower edge portion of the member and the peripheral edge portion of the bottom surface member are welded and the inside is filled with a fluid.
A packaging bag characterized in that the flat member and the bottom member are formed in a shape satisfying the condition of the following formula [1].
S1 <S2 ... [1]
S1: Maximum opening area of the lower edge of the flat member when the inside of the packaging bag is filled with fluid S2: Surface area of the bottom member (excluding the welded portion)
The packaging bag according to claim 1, wherein the flat member and the bottom member are formed in a shape satisfying the condition of the following formula [2].
S2 × 0.1 <S1 <S2 × 0.9 ... [2]
The packaging bag according to claim 1, wherein the flat member and the bottom member are formed in a shape satisfying the condition of the following formula [3].
S2 × 0.1 <S1 <S2 × 0.8 ... [3]
The packaging bag according to claim 1, wherein the flat member and the bottom member are formed in a shape satisfying the condition of the following formula [4].
S2 × 0.2 <S1 <S2 × 0.8 ... [4]
When the inside of the packaging bag is filled with fluid, the bottom member is configured to be deformed in a chevron shape in advance toward the inside of the packaging bag with respect to the front and back directions of the flat member. The packaging bag according to claim 1.
5. The bottom member is configured such that when the inside of the packaging bag is filled with fluid, the central portion of the flat member in the front-back direction projects toward the inside of the packaging bag. Packaging bag described in
The packaging bag according to claim 1, wherein the flat members are welded to each other on both side portions in the width direction.
The packaging bag according to claim 7, wherein the flat member has lower edges welded to each other at both ends in the width direction.
The packaging bag according to claim 7, wherein the flat members are welded to each other on the inner side in the width direction with respect to the welded portions of the left side edges and / or the right side edges.
A claim in which the lower edge portions of the flat member are welded at positions where the left edge portions and / or the right edge portions are welded to each other in the width direction and satisfy the condition of the following formula [5]. Item 9. The packaging bag according to item 9.
K1 <K x 1/3 ... [5]
K1: Distance from the widthwise outer position of the widthwise end of the lower edge portion of the flat member to the widthwise inner position of the welded portion between the lower edge portions K: The most of the lower edge portion of the flat surface member. Significantly
The packaging bag according to claim 1, which is provided with a connector.
The packaging bag according to claim 1, which is provided with a spout.
The packaging bag according to claim 1, a connector provided in the packaging bag, and a discharge mechanism connected to the connector are provided, and the fluid filled in the inside of the packaging bag is discharged by the discharge mechanism. A fluid discharge container characterized by.