JP2019044811A - Check valve - Google Patents

Abstract

To provide a check valve capable of maintaining swelling of a swollen body.SOLUTION: A check valve of a swollen body is formed between two resin films, and comprises a gas chamber storing gas therein, and an introduction port communicating with the gas camber and introducing gas into the gas chamber. The check valve has: a base part provided at the introduction port, and extending from the outside of the gas chamber to the inside of the gas chamber; and an extension part arranged in the gas chamber continuously to the base part, and opened into the gas chamber. The extension part is formed into a reversely tapered shape from the base part side toward a center part of the extension part.SELECTED DRAWING: Figure 6

Description

  The present invention relates to a check valve.

  A bulging body for packaging articles such as toilet paper, a bulging body used as a cushioning material for packing, a gas chamber for holding gas between two resin films, an inlet for introducing the gas into the gas chamber, and There is something that is provided. In such a bulging body, when the gas is supplied from the inlet into the gas chamber, the gas chamber is expanded and the bulging body is expanded, and the expanded bulging body can function as a buffer or the like.

  For example, in JP 2012-148780 A (patent document 1), two synthetic resin films are superposed and integrated, and a space for accumulating gas between the two films and a gas in this space A balloon body provided with an airway for delivery is disclosed.

JP 2012-148780 A

  However, in the conventional bulging body, there is a problem that the gas in the gas chamber leaks from the inlet communicating with the gas chamber to the outside of the gas chamber, and the bulging body can not be maintained.

  An object of the present invention is to provide a check valve capable of maintaining the expansion of the expansion body.

  In order to solve the above problems, according to a first aspect of the present invention, a gas chamber is formed between two resin films and introduced into the gas chamber in communication with the gas chamber for storing the gas therein and the gas chamber. A check valve for a bulging body comprising an inlet, the base being provided in the inlet and extending into the gas chamber from the outside of the gas chamber, and being disposed in the gas chamber continuously with the base A check valve having an extension opening into the gas chamber, the extension being an inverse taper from the base side toward a central portion of the extension.

  In the first aspect, a check valve provided on a bulging body having a gas chamber formed between two resin films and an inlet for introducing the gas into the gas chamber is provided from the outside of the gas chamber to the gas chamber. And an extension portion disposed in the gas chamber continuously with the base. Then, the extension portion of the check valve is reversely tapered from the base side toward the central portion of the extension portion, whereby a narrow portion with a narrow width is formed between the base portion of the check valve and the extension portion. The term “two resin films” also includes the case where one resin film is folded to form two sheets.

  In the first aspect, the presence of such a constriction causes the constriction to be narrowed by the pressure in the gas chamber when the pressure in the gas chamber becomes higher than the pressure outside the gas chamber. Therefore, the backflow of the gas from the gas chamber is suppressed, and the gas supplied into the gas chamber becomes difficult to flow from the gas chamber toward the outside of the bulging body. As a result, air in the bulging body can not be easily removed, and the bulging body can be maintained in a bulging state.

  The second aspect provides the check valve in which the extension portion is tapered from the central portion to the side opening into the gas chamber. In the second aspect, by making the extension of the check valve such a taper, the check valve is used for the narrow portion formed between the base of the check valve and the extension. A wide extension is formed at the center of the extension of the.

  In the second aspect, when the pressure in the gas chamber is higher than the outside of the gas chamber due to the presence of such an extension, the gas in the gas chamber is likely to be accumulated near the constriction portion, and the constriction portion further Pressed by pressure, it becomes narrower. Therefore, the backflow of the gas from the gas chamber is further suppressed, and the expansion of the expansion body can be further maintained.

  In the second aspect, the width of the opening of the check valve is narrower than the width of the expanded portion of the check valve, so when the pressure in the gas chamber becomes higher than the outside of the gas chamber, the check valve The pressure at the opening of the gas chamber is pushed by the pressure in the gas chamber, and the width of the opening tends to narrow. Thereby, the backflow of the gas from the gas chamber is further suppressed, and the expansion of the expansion body can be reliably maintained.

  A third aspect provides a check valve in which the width of the extension extends from the base side toward the central portion of the extension and narrows from the central portion to the side opening into the gas chamber. Do. In the third aspect, by adopting a check valve having such a width extension, the check valve extension is reversely tapered from the base side to the center as described above, and It can be tapered from the central portion toward the side opening into the gas chamber. Therefore, the backflow of the gas from the gas chamber is reliably suppressed, and the expansion of the expansion body can be reliably maintained.

  A 4th aspect provides the non-return valve with which the shape of the said extension part is square shape by front view. In the fourth aspect, by adopting the check valve having such a rectangular extension, the above-described narrowed portion and the expanded portion can be reliably formed in the check valve. Accordingly, when the pressure in the gas chamber is higher than the outside of the gas chamber, the expanded portion formed at the central portion of the extension portion is not easily crushed inward even when pressed by the pressure in the gas chamber. On the other hand, the constriction formed between the base and the extension is pushed by the pressure in the gas chamber and becomes narrower. Furthermore, at the opening of the check valve, the pressure in the gas chamber pushes the opening width narrow. Therefore, by providing such a check valve, the backflow of air from the gas chamber can be reliably suppressed, and the expansion of the bulging body can be reliably maintained.

  The fifth aspect provides a check valve in which the base is tapered from the outside of the bulging body toward the gas chamber. In the fifth aspect, by tapering the base of the check valve from the outside of the bulging body toward the gas chamber, the pressure in the base of the check valve becomes higher near the extension, Air will be more likely to flow from the base towards the extension. Thus, air can easily flow from the outside of the bulging body toward the gas chamber, and air can be easily supplied into the bulging body.

  The sixth aspect provides a check valve in which the width of the base narrows from the outside of the bulging body toward the gas chamber. In the sixth aspect, by adopting a check valve having such a width of the base, the base of the check valve is tapered from the outside of the bulging body toward the gas chamber as described above. This makes it easier for air to flow reliably from the base of the check valve toward the extension, and for air to be supplied reliably into the bulging body.

  A seventh aspect provides a check valve formed of a heat seal. In the seventh aspect, the check valve provided at the inlet of the bulging body is formed by heat sealing, so the gas chamber of the bulging body is made into a space surrounded by the heat seal, whereby the non-return valve is formed. It can be formed together with the bulging body. Therefore, the check valve can be easily disposed to the inlet of the bulging body.

  According to one aspect of the present invention, it is possible to provide a check valve capable of maintaining the bulging of the bulging body.

It is a figure which shows the packaging bag provided with the non-return valve which concerns on embodiment (1st Embodiment) of this invention. It is an enlarged view which shows the holding part vicinity of the packaging bag of FIG. It is the sectional view on the AA line of FIG. It is the BB sectional drawing of FIG. It is the CC sectional view taken on the line of FIG. It is the figure which expanded the non-return valve concerning this embodiment (1st Embodiment). It is the figure which expanded the non-return valve concerning this embodiment (2nd embodiment). It is a figure which shows the flow of the air in the non-return valve which concerns on this embodiment. It is a figure which shows the flow of the air in the non-return valve which concerns on this embodiment. It is a figure which shows the flow of the air in the non-return valve which concerns on this embodiment. It is a figure which shows the state before putting a hand on the handle part of the packaging bag provided with the non-return valve which concerns on this embodiment. It is a figure which shows the state which hooked the hand on the handle part of the packaging bag in which the non-return valve based on this embodiment was provided. It is a figure which shows the state which grasped the handle part of the packaging bag provided with the non-return valve based on this embodiment, and lifted the packaging bag. It is a figure which shows the example (comparative example 1) in which the check valve is not provided in the bulging body. It is a figure which shows the example (comparative example 2) in which the non-return valve which does not have an extension part was provided in the bulging body. It is a figure which shows the handle part (comparative example 3) of the conventional packaging bag. It is a figure which shows the handle part (comparative example 4) of the conventional packaging bag.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 shows a packaging bag provided with a check valve according to an embodiment (first embodiment) of the present invention. FIG. 2 shows the vicinity of the handle of the packaging bag of FIG. Further, FIG. 3 shows a cross section taken along line A-A of FIG. 2, FIG. 4 shows a cross section taken along line B-B of FIG. 2, and FIG. 5 shows a cross section taken along line C-C of FIG. In the following description, the same reference numerals may be given to parts common to the respective drawings and the description may be omitted.

  In FIGS. 1 and 2, the packaging bag 100 includes a bag body 10, a handle 20, and finger rests 30 and 40. The bag body 10 constitutes a main body of a packaging bag in which a package (toilet paper) T is accommodated. The bag body 10 can be formed of a soft resin film or the like. The bag body 10 has a structure in which a resin film is formed into a bag shape by side sealing, and the bag-shaped resin film is folded in a gusset shape (see FIGS. 1 and 2).

  The material of the resin film forming the bag body 10 is arbitrary. As such a resin film, for example, a resin film such as polyethylene (PE) or a PE-ethylene vinyl alcohol copolymer (EVOH) -PE laminate (PE / EVOH / PE) can be used. Moreover, the thickness of the resin film is arbitrary. For example, when PE or PE / EVOH / PE is used as the resin film, the thickness of the resin film can be 10 to 70 μm, preferably 15 to 60 μm, and more preferably 20 to 50 μm.

  The bag body 10 accommodates twelve roll-shaped toilet paper T as a packaged bag (see FIG. 1). The form of the package is not limited to a roll, and may be stored in another form such as a laminate. Moreover, the to-be-packaged body accommodated in the bag main body 10 is not limited to toilet paper, and articles | goods, such as a kitchen paper, a paper diaper for babies or nursing, and a sanitary napkin, can be accommodated.

  Furthermore, the number of articles stored in the bag body 10 as a package is not limited, and may be one or more as shown in FIG. Note that, in the example shown in FIG. 1, a total of 12 toilet papers T are accommodated in the bag body 10 in a state in which four roll-shaped toilet papers T arranged in one stage are stacked in three stages. However, the arrangement of the packages to be accommodated in the bag body 10 is not limited to this arrangement, and for example, twelve toilet papers T may be accommodated in the bag body 10 in a row. .

  The handle 20 is provided on the upper portion 11 of the bag body 10 as shown in FIGS. 1 and 2, and constitutes a portion for gripping the packaging bag 100 with fingers. The handle 20 can be formed of a resin film or the like in the same manner as the bag body 10. The handle 20 is formed on the upper portion 11 of the bag body 10 by heat sealing (heat sealing) not shown. The handle 20 is composed of a base 12 continuous with the bag body 10 (see FIG. 3). The position at which the handle 20 is provided is not limited to the upper portion 11 of the bag body 10, but may be the side surface of the bag body 10. The heat sealing (heat sealing) can be performed, for example, by a method (stamp method) in which the above-mentioned gusset-folded resin film is stamped with a heat plate for forming a hand.

  In the handle 20, the folded resin film is used as a base 12 in the form of four sheets at both ends 23 and 24 in the longitudinal direction (X direction in FIG. 2) of the handle 20. The base half portion 12A and the base half portion 12B which constitute 12 are stacked in two sheets, and are adhered to each other by the seal portion 50 formed of the heat seal H (see FIGS. 2 to 5).

  Moreover, the seal part 50 is arrange | positioned at the upper end 21 and the lower end 22 of the handle 20 so that the finger hooks 30 and 40 may be pinched | interposed up and down. An air hole (not shown) communicating the bag body 10 with the outside of the packaging bag 100 so that the bag body 10 provided with the handles 20 does not burst when the packaging bag 100 is manufactured or distributed. May be provided.

  The handle 20 is provided with finger rests 30 and 40 for hooking a finger when grasping the handle 20. The finger rests 30, 40 are disposed inside the handle 20. Moreover, the finger hooks 30 and 40 are arrange | positioned at the handle 20 in the form pinched | interposed up and down by the above-mentioned seal part 50. As shown in FIG.

  In the present embodiment, as shown in FIG. 1 and FIG. 2, a part of each of the finger rests 30 and 40 is formed by the slit S having an elliptical shape. A central portion 31 of the finger hook 30 is disposed on the lower end 22 side of the handle 20, and both end portions 32 and 33 are disposed on the upper end 21 of the handle 20. On the other hand, in the finger hook 40, the central portion 41 is disposed on the lower end 22 side of the handle 20, and both ends 42 and 43 are disposed on the upper end 21 side of the handle 20. In addition, the shape of the slit S is not limited to the elliptical shape, and for example, a linear slit may be provided. In addition, the form of the slit S is arbitrary, and for example, the slit S can be formed by a perforation, and a finger hook can be formed by breaking the perforation.

  In addition, the handle 20 may be provided with a reinforcing film (not shown) covering the finger rests 30 and 40. This reinforcing film can be formed of a strip-shaped resin film. The material of the reinforcing film is optional, and may be the same as or different from the material of the resin film constituting the handle 20.

  As such a resin film, for example, a laminate of polyethylene (PE), polypropylene (PP), polyethylene terephthalate (PET), and PE-ethylene vinyl alcohol copolymer (EVOH) -PE (PE / EVOH / PE) Etc. can be used. By providing such a reinforcing film, it is possible to reinforce the portion where the finger hooks 30 and 40 of the handle 20 are provided.

  Moreover, the thickness dimension of a reinforcement film is arbitrary. For example, the thickness of the reinforcing film can be 20 μm or more, preferably 30 μm to 150 μm, and more preferably 50 μm to 130 μm. By setting the thickness dimension of the reinforcing film in such a range, it is possible to prevent the handle 20 from being stretched or broken. Moreover, a reinforcement film can be reliably bonded to the handle 20 by the above-mentioned heat welding etc.

In the present embodiment (the first embodiment), the handle 20 is further provided with the seal portion 60.
The sealing unit 60 is configured by overlapping two resin films. Specifically, as shown in FIG. 1 to FIG. 3, the seal portion 60 is formed by overlapping the above-mentioned base half 12 </ b> A and base half 12 </ b> B. In addition, the sealing part 60 is an example of the bulging body in which the non-return valve which concerns on this invention is provided. Like the seal portion 50, the seal portion 60 is formed by heat sealing (heat seal H). In addition, the sealing part 60 is not limited to heat sealing, You may form by apply | coating an adhesive agent, an adhesive, etc.

  Further, the shape of the seal portion 60 is rectangular when viewed in the thickness direction of the handle 20 (the Z direction in FIG. 1) (see FIGS. 1 and 2). By providing such a rectangular seal portion 60, formation of the seal portion 60 constituting the bulging body is facilitated.

  In addition, the shape of the sealing part 60 is not limited to such a rectangular shape. For example, as another shape, the shape of the seal portion 60 may be an elliptical shape (not shown) or the like in a front view (when viewed in the Z direction of FIG. 1). By providing such an elliptically shaped seal portion 60, the central portion of the seal portion 60 constituting the bulging body becomes large in swelling, and when lifting the handle 20, the area in which the seal portion 60 hits the finger or the like As it becomes larger, the handle 20 becomes easier to grip.

  As shown in FIGS. 1 and 2, the seal portion 60 is disposed inside the handle 20 so as to be vertically sandwiched by the above-described seal portion 50. The seal portion 60 is disposed above the finger hooks 30 and 40 (on the upper end 21 side of the handle 20), and faces the finger hooks 30 and 40 in the height direction of the handle 20 (Y direction in FIG. 2). . Opposing in the height direction of the handle 20 means that the finger rests 30 and 40 and the seal portion 60 are spaced apart in the height direction of the handle 20.

  Further, as shown in FIG. 2, the seal portion 60 includes an air chamber 62 and an air inlet 63. The air chamber 62 is formed between the above-mentioned base half 12A and the base half 12B, as shown in FIGS. Further, the air chamber 62 is formed by a space AR surrounded by the heat seal H, so that air can be stored inside. The air chamber 62 forms a space AR in which a part of the base half 12A and a part of the base half 12B expand in the thickness direction of the handle 20 (the Z direction in FIG. 3) by the accumulation of air inside. (See FIGS. 2 to 5).

  The air chamber 62 is an example of a gas chamber provided in a bulging body in which the check valve of the present invention is used. The air stored in the air chamber 62 is an example of the gas stored in the gas chamber in the present invention. The gas stored in the gas chamber is not limited to air, and helium gas, nitrogen gas, a mixed gas of these and air, or the like may be used.

  The air inlet 63 communicates with the air chamber 62 to form an opening through which air can be introduced into the air chamber 62, as shown in FIGS. That is, in the seal portion 60, air can be supplied into the air chamber 62 from the air inlet 63. The air inlet 63 is an example of the inlet in the present invention.

  In the present embodiment, as shown in FIG. 2, the air introduction port 63 is provided at the lower end 60 </ b> A of the seal portion 60. The position of the air inlet 63 is not limited, and may be provided at at least one end of the both ends 60B and 60C of the sealing unit 60. Further, although one air inlet 63 is provided in the present embodiment, the number of the air inlets 63 is not limited, and a plurality of air inlets 63 may be provided.

  The seal portion 60 further includes a check valve 70 as shown in FIGS. 1 and 2. The non-return valve 70 is provided in the air inlet 63, as shown to FIG. 2, FIG. As described later, the check valve 70 can allow the flow of air into the air chamber 62 of the seal portion 60, and can suppress the backflow of air from the air chamber 62 to the outside of the seal portion 60. The check valve 70 is an example of the check valve according to the present invention.

  In the present embodiment, the check valve 70 is formed by heat sealing (heat seal H) as in the seal portion 60. By forming the check valve 70 provided in the air introduction port 63 with such a heat seal H, the check valve 70 can be formed together with the seal portion 50 and the seal portion 60. Therefore, the check valve 70 can be easily disposed to the air introduction port 63 of the seal portion 60.

  In FIGS. 1 and 2, the width of the heat seal H constituting the check valve 70 is different from that of the seal portion 60, but both may be configured by a heat seal having the same width. Further, the formation of the check valve 70 is not limited to the formation by heat sealing, and may be formed by applying an adhesive, an adhesive or the like.

  In the present embodiment, the seal portion 60 as the bulging body is disposed above the finger hooks 30 and 40, and is opposed to the finger hooks 30 and 40 in the height direction of the handle 20 (Y direction in FIG. 2). . Therefore, when the fingers are put on the finger hooks 30 and 40 of the handle 20 and the handle 20 is lifted, the expanded seal portion 60 easily contacts the fingers and the like as a surface. That is, when lifting the handle 20, it becomes difficult for the handle 20 to hit a finger or the like as a line. As a result, according to the present embodiment, it is possible to suppress tightening of fingers and the like by the handle 20 and pain in fingers and the like.

  Further, in the present embodiment, the seal portion 60 is provided with the air chamber 62 for storing the air therein and the air introduction port 63 for communicating with the air chamber 62 and introducing the air into the air chamber 62. Air can be supplied into the portion 60. Thus, even if the air in the air chamber 62 is released and the swelling of the seal portion 60 is reduced, the seal portion 60 can be expanded by supplying air from the air introduction port 63 into the air chamber 62.

  Furthermore, in the present embodiment, the air introduction port 63 is provided with the check valve 70 that suppresses the backflow of the air from the air chamber 62, so the air in the seal portion 60 is difficult to escape. Thus, the seal portion 60 can be maintained in the expanded state, and the expanded seal portion 60 can be maintained in a state in which the seal portion 60 is in contact with the finger or palm (hereinafter referred to as a finger or the like). Therefore, it can suppress that a finger is tightened by the handle 20 or that a finger etc. becomes painful, and the packaging bag 100 can be made easy to hold. By gripping the handle 20 in this state, it is possible to stably carry the packaging bag 100 in which the packaged material (toilet paper) T is stored.

  Further, in the present embodiment, the presence of the seal portion 60 provided above the finger hooks 30 and 40 suppresses tightening of fingers and the like by the handle 20 and preventing pain in fingers and the like. The shape of 20 is hard to change. Therefore, in the present embodiment, when carrying the packaging bag 100 in a state in which the packaged body T is accommodated in the bag main body 10, it is possible to prevent the handle 20 from being extended or broken.

  Further, in the present embodiment, since the seal portion 60 is formed of the heat seal H as described above, the seal portion 60 can be easily disposed relative to the handle 20. Further, in the seal portion 60, the air chamber 62 and the air introduction port 63 can be easily arranged. Furthermore, since the seal portion 60 can be disposed together with the seal portion 50 when the handle 20 is sealed by the seal portion 50, the manufacturing of the packaging bag 100 is easy.

  In the present embodiment, as shown in FIGS. 1 and 2, the air introduction port 63 of the seal portion 60 communicates with the inside of the bag body 10. Thus, since the air introduction port 63 communicates with the air chamber 62 of the seal portion 60, the air chamber 62 of the seal portion 60 can communicate with the inside of the bag body 10. Specifically, as shown in FIG. 2, a passage 80 is provided inside the handle 20. In the passage 80, one end 80A communicates with the air introduction port 63, and the other end 80B communicates with the inside of the bag body 10.

  In the present embodiment, the passage 80 is connected between the finger hook 30 and the finger hook 40 to the check valve 70 provided in the air introduction port 63 communicating with the lower end 60A of the seal portion 60. That is, the passage 80 is disposed closer to the center (central portion 25) of the handle 20. By arranging the passage 80 in such a manner, the air introduction port 63 and the bag body 10 can be communicated at the shortest distance. Thereby, the length of the passage 80 can be shortened between the bag body 10 and the air chamber 62 of the seal portion 60. Therefore, the distance of movement of the air becomes short, and the air is easily supplied into the air chamber 62 of the seal portion 60.

  The passage 80 is formed by the heat seal H similarly to the seal portion 60. Specifically, the passage 80 is formed by a space AP surrounded by the heat seal H. In addition, although the width | variety of the heat seal H which comprises the channel | path 80 differs with respect to the seal | sticker part 60 in FIG. 2, both may be comprised by the heat seal of the same width.

  By forming the passage 80 with the heat seal H in this manner, the passage 80 can be easily disposed relative to the handle 20, the seal portion 50 and the seal portion 60. Further, when the handle 20 is sealed by the seal portion 50, the passage 80 can be disposed together with the seal portion 50, so that the manufacturing of the packaging bag 100 is easy. In addition, the formation of the passage 80 is not limited to the formation by heat fusion, and may be formed by applying an adhesive, an adhesive, or the like.

  According to the present embodiment, since the air introduction port 63 of the seal portion 60 communicates with the inside of the bag body 10, the air in the bag body 10 can be supplied to the air chamber 62 of the seal portion 60. As a result, the pressure in the bag body 10 can be released to the seal portion 60.

  When the bag body 10 accommodates the package body (toilet paper) T, air can easily enter, and when the pressure in the bag body 10 becomes high when storing or carrying the packaging bag 100, the bag body 10 of the packaging bag 100 May burst. However, in the present embodiment, even when the pressure in the bag body 10 is high, the pressure in the bag body 10 can be released into the seal portion 60 as described above, so that the bag body 10 may be ruptured. It can prevent.

  Further, since the check valve 70 is provided at the air introduction port 63 of the seal portion 60, the bag body is allowed to flow from the air chamber 62 of the seal portion 60 while permitting the flow of air into the air chamber 62 of the seal portion 60. It is possible to suppress the backflow of air into 10. Therefore, according to the present embodiment, the bag body 10 can be reliably prevented from being ruptured.

  Furthermore, in the present embodiment, the inside of the seal portion 60 and the inside of the bag body 10 can be reliably communicated by the passage 80 formed in the handle 20. Therefore, the air in the bag body 10 can be reliably supplied to the air chamber 62 of the seal portion 60.

  In the present embodiment, one passage 80 is provided in the air introduction port 63 at the lower end 60A of the seal portion 60 via one check valve 70, but the number of check valves 70 and passages 80 is limited. I will not. Thus, for example, the passage 80 is constituted by two passages (not shown), one of the passages being in communication with the interior of the bag body 10 at one longitudinal end 23 of the handle 20 and one longitudinal end of the handle 20 The end portion 60B of the seal portion 60 on the 23 side is communicated. The other passage communicates with the inside of the bag body 10 on the other end 24 side in the longitudinal direction of the handle 20, and communicates with the end 60C of the seal portion 60 on the other end 24 side of the handle 20 (see FIG. See x direction 2).

  Thus, by arranging one passage on the one end 23 side of the handle 20 and arranging the other passage on the other end 24 side of the handle 20, the finger passages 30, 40 are formed in the two passages. Regions can be formed avoiding. Therefore, the passage 80 can be prevented from interfering with the finger rests 30 and 40. As a result, the dimensions of the finger rests 30 and 40 can be increased, and one finger rest (for example, one linear slit S) can be disposed on the handle 20 instead of the finger rests 30 and 40. The formation of the finger hook is facilitated. Moreover, since the insertion of the finger P in the thickness direction (refer to the Z direction in FIG. 1) of the handle 20 is facilitated, the packaging bag 100 is more easily held.

  FIG. 6 shows a check valve 70 used in the present embodiment (first embodiment). In the present embodiment, as shown in FIG. 6, the check valve 70 includes a base 71 and an extension 72. The base 71 of the check valve 70 extends from the outside of the seal 60 into the air chamber 62 of the seal 60. Further, the width W 1 of the base 71 narrows from the outside of the seal portion 60 into the air chamber 62 of the seal portion 60. That is, the base 71 of the check valve 70 is tapered from the outside of the seal 60 toward the inside of the air chamber 62 of the seal 60. In addition, taper means that it becomes narrow or thin (tapered), so that it goes ahead.

  The extension portion 72 of the check valve 70 is disposed in the air chamber 62 of the seal portion 60 so as to be continuous with the base portion 71 and has an opening portion 73 opening into the air chamber 62. Further, in the check valve 70, the width W2 of the extension portion 72 spreads from the end portion 72A on the base 71 side toward the central portion 72B of the extension portion 72. That is, the extension portion 72 of the check valve 70 is reversely tapered from the base 71 side toward the central portion 72B. The reverse taper, as opposed to the above-mentioned taper, means that it becomes wider or thicker (bent) as it goes forward.

  Further, the width W2 of the extension 72 further narrows from the central portion 72B toward the end 72C on the opening 73 side. That is, the extension 72 of the check valve 70 further tapers from the central portion 72B of the check valve 70 toward the end 72C on the opening 73 side.

  In this embodiment, since the extension 72 of the check valve 70 is reversely tapered from the end 72A on the base 71 side toward the central portion 72B of the extension 72, the extension 71 of the check valve 70 and the extension 71 A narrow portion NS having a narrow width is formed between the portion 72 and the portion 72. In the present embodiment, such a constriction portion NS is formed between two soft resin films, so when the pressure in the air chamber 62 becomes higher than the pressure outside the air chamber 62, the soft resin film is formed. The narrowed portion NS is pushed by the pressure in the air chamber 62 and narrowed. As a result, the backflow of air from the air chamber 62 is suppressed, and the air supplied into the air chamber 62 is less likely to flow from the air chamber 62 toward the outside of the seal portion 60. As a result, the air in the seal portion 60 is less likely to escape, and the expansion of the seal portion 60, which is a bulging body, is maintained.

  Further, in the present embodiment, since the extension 72 of the check valve 70 is further tapered from the central portion 72B toward the end 72C on the opening 73 side of the check valve 70, the extension of the check valve 70 A wide extended portion ES is formed at the central portion 72B of 72. In the present embodiment, when the pressure in the air chamber 62 becomes higher than the outside of the air chamber 62 due to the presence of such an extended portion ES, the air in the air chamber 62 is on the lower end 60A side of the seal portion 60. It tends to be accumulated near the constriction part NS formed, and the constriction part NS is further narrowed by the pressure in the air chamber 62.

  Further, as shown in FIG. 6, the pressure in the air chamber 62 becomes higher than the outside of the air chamber 62 because the width of the opening 73 is narrower than the width of the expanded portion ES as shown in FIG. In this case, when the opening 73 is pressed by the pressure in the air chamber 62, the opening width of the opening 73 tends to be narrowed. Therefore, since the air in the seal part 60 as a bulging body becomes more difficult to escape by the check valve 70 in which such an expansion part ES is formed, the expansion of the seal part 60 can be reliably maintained. As a result, the backflow of air from the air chamber 62 is further suppressed, and the expansion of the seal portion 60 can be reliably maintained.

  Further, as shown in FIG. 6, in the check valve 70, the width W2 of the extension 72 extends from the end 72A on the base 71 side toward the central portion 72B of the extension 72, and further from the central portion 72B to the opening It narrows toward the end 72C on the 73 side. Thereby, as described above, the extension 72 of the check valve 70 is reversely tapered from the end 72A on the base 71 side toward the central portion 72B, and the end 73C on the opening 73 side from the central portion 72B. Taper towards By employing the check valve 70 having such a width W2 of the extension portion 72, the backflow of air from the air chamber 62 is reliably suppressed, and the expansion of the seal portion 60 as the expansion body is reliably maintained. Ru.

  The shape of the check valve 70 is arbitrary, but in the present embodiment, as shown in FIG. 6, the outline shape of the extension portion 72 is square in a front view (viewed in the Z direction of FIG. 1) There is. By adopting the check valve 70 having such a rectangular extension 72, the extension ES can be reliably formed in the central portion 72B of the extension 72 of the check valve 70. The constriction portion NS can be reliably formed between the base portion 71 of the portion 70 and the extension portion 72.

  When the pressure in the air chamber 62 of the seal portion 60 becomes higher than the outside of the air chamber 62 due to the presence of the expanded portion ES and the narrowed portion NS, the expanded portion ES formed in the central portion 72B of the expanded portion 72 Even if it is pushed by the pressure in the air chamber 62, it is hard to be crushed inside. On the other hand, the constriction portion NS formed between the base portion 71 and the extension portion 72 is pushed by the pressure in the air chamber 62 and becomes narrower. Furthermore, the opening 73 of the check valve 70 is also pushed by the pressure in the air chamber 62, and the opening width is narrowed (see FIGS. 8 to 10). Therefore, by adopting such a check valve 70, it is possible to reliably suppress the backflow of air from the air chamber 62.

  Further, in the present embodiment, since the base 71 of the check valve 70 is tapered from the outside of the seal portion 60 toward the inside of the air chamber 62, the air from the base 71 of the check valve 70 toward the extension 72 As the pressure flows, the pressure in the base 71 increases near the extension 72. Therefore, in the check valve 70, air can easily flow from the base 71 to the extension 72. As a result, air can easily flow from the outside of the seal portion 60 toward the air chamber 62 of the seal portion 60, and air can be easily supplied into the seal portion 60.

  Further, since the width W1 of the base 71 of the check valve 70 narrows from the outside of the seal portion 60 toward the inside of the air chamber 62 of the seal portion 60, the base 71 of the check valve 70 It can be reliably tapered from the outside into the air chamber 62. In the present embodiment, the adoption of the check valve 70 having the width W1 of the base 71 makes it easy to reliably supply air into the seal portion 60.

  In the check valve 70, the opening width W3 of the opening 73 is preferably shorter than the distance W4 between the central portion 72B of the expanded portion ES and the both ends 60B and 60C of the sealing portion 60 (see FIG. 6). When the pressure in the air chamber 62 of the seal portion 60 becomes higher than the outside of the air chamber 62, the air in the air chamber 62 escapes in the direction of the opening 73 or the narrowed portion NS. In this case, when the opening width W3 of the opening 73 is longer than the distance W4, the air in the air chamber 62 flows from the opening 73 into the check valve 70 and easily escapes to the outside of the air chamber 62.

  On the other hand, as shown in FIG. 6, when the opening width W3 of the opening 73 is shorter than the distance W4, the air in the air chamber 62 is the expanded portion ES of the check valve 70 and both ends 60B of the sealed portion 60. , 60C, flows to the lower end 60A side of the seal portion 60, and easily accumulates on the outside of the narrowed portion NS of the check valve 70. The air accumulated outside the constriction part NS pushes the constriction part NS of the check valve 70 from the outside, and the constriction part NS of the check valve 70 is crushed inward, and the constriction part NS of the check valve 70 It becomes difficult for air to pass inside. Therefore, when the check valve 70 is arranged with respect to the seal portion 60 in this manner, the backflow of air from the air chamber 62 can be reliably suppressed.

  FIG. 7 shows a check valve 70 used in the present embodiment (second embodiment). In the second embodiment, as shown in FIG. 7, the outline of the extension 72 is circular in a front view (viewed in the Z direction of FIG. 1). Also by adopting the check valve 70 having such a circular extension 72, the extension ES is formed at the central portion 72B of the extension 72 of the check valve 70, and the base 71 of the check valve 70 A constriction portion NS can be formed between the extension portion 72 and the extension portion 72. Therefore, by adopting such a check valve 70, the backflow of air from the air chamber 62 can be reliably suppressed even in the second embodiment.

  8 to 10 show the flow of air in the check valve 70 used in the present embodiment (first embodiment). The arrows shown in FIGS. 8 to 10 indicate the flow of air. FIG. 8 shows a state in which the pressure is higher outside the air chamber 62 than in the air chamber 62. In this case, air flows from the outside of the seal 60 through the check valve 70 and into the air chamber 62 of the seal 60, as shown in FIG.

  In FIG. 10, the pressure is higher inside the air chamber 62 than outside the air chamber 62. In this case, the air in the air chamber 62 passes between the expanded portion ES of the check valve 70 and both end portions 60B and 60C of the seal portion 60 and flows toward the lower end 60A of the seal portion 60. The air that has flowed to the lower end 60A of the seal portion 60 is accumulated outside the narrowed portion NS of the check valve 70, and the accumulated air pushes the narrowed portion NS of the check valve 70 from the outside, and the inside of the narrowed portion NS It narrows. Further, part of the air flows near the opening 73 of the check valve 70, whereby the opening 73 is pushed from the outside and the opening width of the opening 73 is narrowed (see FIG. 10).

  As described above, when the pressure is higher outside the air chamber 62 than inside the air chamber 62, air is supplied from the outside of the air chamber 62 into the air chamber 62. On the other hand, in a state where the pressure is higher in the air chamber 62 than in the outside of the air chamber 62 (a state where air is supplied to the air chamber 62), backflow of air from the air chamber 62 to the outside of the seal portion 60 is suppressed be able to. Therefore, the check valve 70 provided at the air introduction port 63 of the seal portion 60 allows the flow of air into the air chamber 62 of the seal portion 60, and the air flows backward from the air chamber 62 to the outside of the seal portion 60. Can be suppressed (see FIGS. 8 to 10).

  FIGS. 11-13 shows the procedure which lifts the packaging bag of this embodiment (1st Embodiment) shown to FIGS. 1-5 with a finger. In addition, although the handle 20 is normally in a state of being fallen with respect to the bag main body 10, in FIGS. 10 to 12, in order to facilitate understanding, the handle 20 is held with respect to the bag main body 10 It is shown in a state of being erected in the height direction of 20 (Y direction).

  When lifting up the packaging bag 100, first, as shown in FIG. 10, the finger P is in the thickness direction of the handle 20 via the slit S from the state before putting the finger P on the handle 20 (Z direction in FIG. 11). As shown in FIG. 11, the finger P hangs on the finger hooks 30 and 40 of the handle 20. As shown in FIG.

  From this state, as shown in FIG. 12, when the handle 20 is grasped, the expanded seal portion 60 can be grasped by the finger P. In this state, as shown in FIG. 12, when the handle 20 is lifted, the seal portion 60 can hit the finger P as a surface (the handle 20 does not easily hit the finger P as a line). As a result, tightening of the finger P by the handle 20 or pain in the finger is suppressed.

  As described above, according to the present embodiment, even in the case where the packaging bag 100 is carried in a state in which the package body (toilet paper T) is accommodated, the packaging bag 100 can be easily held. Further, as shown in FIG. 12, when the handle 20 is lifted, the shape of the finger rests 30, 40 is hard to change by gripping the seal portion 60 with the finger P, and the handle 20 stretches or breaks. Is suppressed.

  Hereinafter, the present embodiment will be specifically described using examples. The measurement and evaluation of each example and comparative example were performed as follows.

[Air vent test]
As a test body, a handle 20 having a seal portion 60 formed inside was prepared. The dimensions of the handle 20 were about 200 mm in the longitudinal direction (X direction in FIG. 2) and about 50 mm in the height direction (Y direction in FIG. 2). The dimensions of the seal portion 60 as the bulging body were about 90 mm in the longitudinal direction (X direction in FIG. 2) and about 30 mm in the height direction (Y direction in FIG. 2). Place the handle 20 supplied with air in the seal unit 60 on a flat desk, and place an acrylic plate (length: about 100 mm, width: about 50 mm, thickness: about 3 mm) on the handle 20, Furthermore, a rectangular solid weight (weight: 1.5 kg, base area: 80 mm × 20 mm) was placed on the acrylic plate. Then, after placing the weight for 10 seconds, it was confirmed that the air had escaped. As for the degree of air removal, check whether the ratio of the distance between the desk and the acrylic plate after placing the weight for 10 seconds to the distance between the desk and the acrylic plate before placing the weight is 50% or more And rated according to the following criteria.
○: The proportion of the distance was 50% or more (the air was difficult to escape)
X: The percentage of distance was less than 50% (air was easy to escape)

[Pendulum test]
The user places the right index finger and middle finger on the finger rests 30 and 40 of the packaging bag 100 containing 12 roll-shaped toilet paper T (“Elierle tissue tissue 60 m single (147 g / roll)” manufactured by Daio Paper Co., Ltd.) The ring finger was put on the little finger, and the handle 20 of the packaging bag 100 was held, and reciprocated 10 times like a pendulum in the range of 180 °. At this time, the durability of the packaging bag 100 was evaluated based on the following criteria. In addition, the pendulum test performed five tests about each Example and comparative example.
○: No damage was confirmed even in 1 out of 5 ×: Damage was found in 1 out of 5 times

[Finger test]
After performing one reciprocation of the above pendulum test, the degree of tightening on the finger of one user was evaluated in the following five steps. In this case, the results of the tests conducted by 10 users for each of the example and the comparative example were scored, and the average value was calculated. When the average value was 3.0 or more, it was judged that the result of the finger test was good.
5 points: do not feel tightening on the finger 4 points: feel a slight tightening on the finger 3 points: feel a slight tightening on the finger 2 points: feel the tightening on the finger 1 point: tightening on the finger Feel strong

  Hereinafter, Examples and Comparative Examples will be described.

Example 1
The packaging bag 100 was produced using a bag making machine from a 25 μm thick polyethylene film. As shown in FIG. 1, the handle 20 is formed on the upper portion 11 of the bag body 10, and the dimension of about 200 mm in the longitudinal direction (X direction in FIG. 2) and about 50 mm in the height direction (Y direction of FIG. 2) did. As shown in FIG. 2 and FIG. 3, elliptical slits S are provided as the finger rests 30 and 40 respectively. The slits S were arranged such that the shape of the ellipse was approximately symmetrical. The finger hook 30 has the center portion 31 disposed on the lower end 22 side of the handle 20 and the both end portions 32 and 33 disposed on the upper end 21 side of the handle 20. In the finger hook 40, the central portion 41 is disposed on the lower end 22 side of the handle 20, and the both ends 42 and 43 are disposed on the upper end 21 side of the handle 20. The dimensions of the slits S were about 30 mm for the major axis of the ellipse and about 15 mm for the minor axis, and the distance between the slits S in the X direction was about 20 mm at the shortest. In addition, a rectangular seal portion 60 is disposed above the finger hooks 30 and 40 as a bulging body in a front view (viewed in the Z direction in FIG. 2). The dimensions of the seal portion 60 were about 90 mm in the longitudinal direction (X direction in FIG. 2) and about 30 mm in the height direction (Y direction in FIG. 2). The distance between the finger hooks 30, 40 and the seal portion 60 was about 5 mm. Furthermore, at the air introduction port 63 of the seal portion 60, a check valve 70 having a base portion 71 and an extension portion 72 is provided. In the check valve 70, the width W1 of the base 71 narrows (tapes) from the outside of the air chamber 62 toward the inside of the air chamber 62, and the width W2 of the extension 72 from the end 72A on the base 71 side to the central portion 72B. Of the central portion 72B toward the end portion 72C on the opening 73 side (tapered). Moreover, the extension part 72 of the non-return valve 70 was made into square shape (refer FIG. 2, FIG. 6). Further, a passage 80 communicating with the bag body 10 and passing between the finger hook 30 and the finger hook 40 and connected to the check valve 70 of the air introduction port 63 at the lower end 60A of the seal portion 60 is provided. The results are shown in Table 1.

Example 2
As shown in FIG. 7, it carried out similarly to Example 1 except having made the extension part 72 of the non-return valve 70 into circular shape. The results are shown in Table 1.

Comparative Example 1
As shown in FIG. 14, the same procedure as in Example 1 was carried out except that the check valve 70 was not provided and only the passage 80 communicating with the air inlet 63 at the lower end 60A of the seal portion 60 was provided. The results are shown in Table 1.

Comparative Example 2
As shown in FIG. 15, the procedure was the same as in Example 1 except that the check valve 70 was not provided with the extension portion 72. The results are shown in Table 1.

Comparative Example 3
As shown in FIG. 16, the seal portion 60 was not provided, and an elliptical slit S was provided as the finger hook 30. The slit S was arranged to leave part of the lower end of the perimeter of the ellipse. The finger holder 30 has the center portion 31 of the finger holder 30 disposed on the upper end 21 side of the handle 20, and the both end portions 32 and 33 disposed on the lower end 22 side of the handle 20. The dimensions of the slit S were about 80 mm in the X direction and about 20 mm in the Y direction. Except for these conditions, it was the same as Example 1. The results are shown in Table 1.

Comparative Example 4
As shown in FIG. 17, the seal portion 60 was not provided, and elliptical slits S were provided as the finger rests 30 and 40 respectively. Slits S and S were arranged so that the shape of an ellipse became almost symmetrical horizontally. The finger hook 30 has the center portion 31 disposed on the lower end 22 side of the handle 20 and the both end portions 32 and 33 disposed on the upper end 21 side of the handle 20. Moreover, the finger ring 40 arrange | positioned the center part 41 to the lower end 22 side of the handle 20, and arrange | positioned both-ends 42 and 43 to the upper end 21 side of the handle 20. As shown in FIG. The dimensions of the slits S were about 30 mm for the major axis of the ellipse and about 15 mm for the minor axis, and the distance between the slits S in the X direction was about 20 mm at the shortest. Except for these conditions, it was the same as Example 1. The results are shown in Table 1.

表１より、延長部７２が基部７１側の端部７２Ａから中央部７２Ｂに向かって逆テーパである逆止弁７０が持手２０に設けられた構成では、空気抜け試験の結果はいずれも○となった。また、振り子試験の結果はいずれも〇となった。さらに、指掛け試験の結果はいずれも３．０以上となった（実施例１、２）。

From Table 1, in the configuration in which the handle 20 is provided with the check valve 70 in which the extension portion 72 is reverse-tapered from the end portion 72A on the base 71 side toward the central portion 72B, the air release test results are all ○ It became. In addition, the results of the pendulum test were all 〇. Furthermore, as a result of the finger impression test, all became 3.0 or more (Examples 1 and 2).

  On the other hand, in the configuration in which the check valve 70 is not provided and the passage 80 communicating with the air inlet 63 at the lower end 60A of the seal portion 60 is provided, and in the configuration in which the extension portion 72 is not provided in the check valve 70, In all cases, the result of the air leak test was x. Also, the result of the pendulum test was x. Furthermore, the result of the finger test was less than 3.0 (Comparative Examples 1 and 2).

  Further, in the configuration in which one elliptical slit S is provided as the finger hook and the configuration in which two elliptical slits S are provided as the finger hook, the result of the finger hook test is less than 3.0 (comparative example) 3). Moreover, in the structure which provided two elliptical slit S as a finger hook part, although the result of the pendulum test became (circle comparative example 4), the structure which provided one elliptical slit S as a finger hook part Then, the result of the pendulum test was x (comparative example 3).

  From these results, it is difficult for the air of the bulging body to escape by providing a check valve in which the extending portion is a reverse taper toward the central portion of the extending portion from the base side to the inlet of the bulging body. It was found that the swelling of the Therefore, by providing the handle 20 provided with the seal portion 60 as such a bulging body to the packaging bag 100, air can not easily escape from the seal portion 60 of the handle 20, and the package body (toilet paper) T is accommodated. It was found that even when carried in a stationary state, it was easy to hold and hard to break.

  Although the embodiments of the present invention have been described above, the present invention is not limited to the specific embodiments and examples described above, and various modifications may be made within the scope of the invention described in the claims. Changes are possible.

100 Packaging bag T Toilet paper (packaged material)
DESCRIPTION OF SYMBOLS 10 bag main body 11 upper part 12 base 12A base half part 12B base half part 20 holding hand 21 upper end 22 lower end 23 one end 24 other end 30 finger hook 40 finger hook S slit 60 seal part 62 air chamber AR space 63 air introduction port 70 reverse stop Valve H Heat seal 71 Base W1 Width 72 Extension 72A End 72B Central 72C End 73 Opening W2 Width NS Constriction ES Expansion

Claims (7)

A check valve of a bulging body comprising: a gas chamber formed between two resin films and storing the gas therein; and an introduction port communicating with the gas chamber for introducing the gas into the gas chamber, ,
Provided at the inlet,
A base extending into the gas chamber from the outside of the gas chamber, and an extension portion continuously disposed in the gas chamber and open to the gas chamber,
The non-return valve, wherein the extension is a reverse taper from the base side toward the central part of the extension.   The check valve according to claim 1, wherein the extension portion is tapered from the central portion to a side opening into the gas chamber.   The non-return stop according to claim 1 or 2, wherein the width of the extension extends from the base side toward the central portion of the extension and narrows from the central portion to the side opening into the gas chamber. valve.   The non-return valve according to claim 2 or 3, wherein the shape of the extension is square in front view.   The check valve according to any one of claims 1 to 4, wherein the base portion is tapered toward the gas chamber from the outside of the bulging body.   The non-return valve according to any one of claims 1 to 5, wherein the width of the base narrows from the outside of the bulging body toward the gas chamber.   The check valve according to any one of claims 1 to 6, which is formed by a heat seal.

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