JP4673929B1 - Seat check valve structure - Google Patents

Abstract

Provided is a seat check valve structure that can reduce the resistance of fluid flow when fluid flows from upstream to downstream (forward flow) as well as reliably preventing backflow. Realize downsizing of stop valve.
The front and rear valve seats (16, 17) are joined together by a left valve seal (32) and a right valve seal (33) extending in the vertical direction, and a check valve passage (21) is defined by the left and right valve seals (32, 33). The Between the upper ends of the left and right valve seals 32, 33 is an upstream port 22, and between the lower ends is a downstream port 23. The front valve seat 16 extends upward from the upstream port, and the extended protruding portion 19 is joined to the front bag sheet 13 by a front extension portion seal 40. The rear valve seat 17 includes a protruding portion 20 that extends upward from the upstream port, and the protruding portion 20 is joined to the rear bag sheet 14 by a rear extending portion seal 41.
[Selection] Figure 1

Description

The present invention relates to a check valve structure made of a sheet, a bag provided with the check valve structure, a bag manufacturing method, and a valve seat.

Conventionally, a check valve structure made of a sheet is used for various bags. For example, to arrange the upstream side of the check valve to the outside of the bag and to allow fluid such as air to flow from the outside of the bag into the bag through the check valve so that the fluid does not escape from the bag Used for. Specific applications include balloons, cushioning materials, gas storage bags, liquid storage bags, and the like.

Also, the upstream side of the check valve is arranged inside the bag, and fluid such as air is discharged from the inside of the bag to the outside through the check valve, and is used to keep the inside of the bag at a negative pressure from the outside. . Specific examples of the application include storage bags for various articles such as clothing, futons, and foods. Furthermore, it is used for storing articles generating gas such as coffee beans in the bag, and discharging the generated gas from the inside of the bag to the outside through a check valve to keep the inside of the bag at a predetermined pressure.

As this kind of check valve structure, those shown in prior art documents 1 to 4 are known. In these check valve structures, at least two front and rear valve seats are arranged between front and rear bag sheets arranged front and rear, and a check valve flow path is formed between the front and rear valve seats. In this check valve flow path, fluid is allowed to pass in only one direction from the upstream port to the downstream port, and the back flow from the downstream port to the upstream port is prevented. The left valve seal and the right valve seal that extend in the direction define the check valve flow path, the upper end of the left and right valve seals is the upstream port, and the lower end of the left and right valve seals is the lower end. This is the downstream port.

This type of check valve structure allows only fluid flow (forward flow) from upstream to downstream by the left and right valve seals formed on the two front and rear valve seats, and the back and forth valve seats are in close contact with each other. Is not allowed.

The performance required for this type of check valve is to first prevent backflow reliably. In order to reliably prevent backflow, as in Prior Art Document 4, the interval between the left and right valve seals is gradually reduced from upstream to downstream to narrow the check valve flow path or lengthen the check valve flow path. It is preferable to do. However, when the check valve channel is throttled or lengthened, the resistance tends to increase even in the forward flow. For this reason, when air is introduced into the bag, it becomes difficult to introduce the air with the exhalation of a person, and a device such as a pump may have to be used. Also, increasing the check valve flow path is a disadvantageous factor when it is desired to reduce the volume of the bag.

Furthermore, when the check valve flow path is throttled, it is most common to perform an inclined seal, but the valve seat is distorted and wrinkled by the influence of the inclined seal, causing a reduction in the backflow prevention effect. . In particular, when the left and right ends of the front and rear valve seats are fixed to the front and rear bag sheets, when the air is inflated, the front and rear valve seats inside the bag become noticeable, and a sufficient backflow prevention effect cannot be obtained. .

JP-A-10-706 JP 2000-218718 A JP 2001-10644 A International Publication WO2004 / 048077 Pamphlet

An object of the present invention is to provide a seat check valve structure capable of reducing the resistance of the fluid flow when the fluid flows from the upstream to the downstream (forward flow) as well as preventing the backflow.
Another object of the present invention is to provide a check valve structure made of a sheet that can effectively obtain a backflow prevention effect even with a short check valve flow path.

Still another object of the present invention is a bag having a plurality of cells so as to be suitable for use as a cushioning material, and a bag with a check valve that can inflate cells with a small resistance when fluid flows in. Is to provide.

Still another object of the present invention is a bag having a plurality of cells so as to be suitable for use as a cushioning material, and a bag with a check valve that can inflate cells with a small resistance when fluid flows in. It is in providing the manufacturing method of.

Still another object of the present invention is to form a non-return valve structure made of a sheet that can reduce the resistance of the flow of fluid in the flow of fluid from the upstream to the downstream (forward flow) as well as preventing backflow. The purpose is to provide a suitable valve seat.

The above-mentioned problems are solved by means of each invention of the claims of the present application. In each invention of the present application, the top, bottom, front, back, left, and right only indicate the relative positional relationship of each part, and do not specify an absolute position.
The invention according to claim 1 of the present application is
At least one valve seat is coordinated between the front and rear bag sheets coordinated back and forth,
Between the bag seat and the valve seat, or between the valve seats is a check valve flow path,
In the check valve structure made of a sheet that allows passage of fluid in only one direction from the upstream port to the downstream port of the check valve flow path and prevents back flow from the downstream port to the upstream port,
Sheets that constitute the check valve flow path are joined by a left valve seal and a right valve seal that extend in the vertical direction, thereby defining the check valve flow path,
Between the upper ends of the left and right valve seals is the upstream port, between the lower ends of the left and right valve seals is the downstream port,
By connecting the front and rear bag sheets with a passage seal to the front and rear bag sheets, a flow path that can be conducted to the outside of the bag is formed,
The valve seat extends upward from the upstream port , and is an extended portion of the valve seat that is joined to the bag sheet by an extension portion seal in the flow path .
The left and right length of the extension part seal is not less than the left and right width of the upstream port,
The lower end of the left valve seal is connected to the lower valve seal,
The lower end valve seal is extended laterally toward the right valve seal,
A line connecting the tip of the lower valve seal and the tip of the right valve seal becomes the downstream port,
A passage extension is formed further downstream than the downstream port,
The passage extension is defined by the downstream port, the downstream edge of the one or more valve seats, and an imaginary line,
The imaginary line connects the downstream tip of the right valve seal and the downstream edge of the valve seat,
The seat check valve structure is characterized in that the air in the check valve channel can flow out of the valve seat through the passage extension from the downstream port .
The invention according to claim 2 of the present application provides the check valve structure made of seat according to claim 1, wherein the extension portion seal is laterally continuous .
The invention according to claim 3 of the present application is
The left and right valve seals are such that the left and right intervals become smaller stepwise from the upstream side to the downstream side of the check valve flow path, and the left and right valve seals are arranged in parallel to each other. The seat check valve structure according to claim 1 is provided.
The invention according to claim 4 of the present application is
At least two of the above-mentioned valve seats are coordinated,
Between the front and rear valve seats is a check valve flow path,
The above-mentioned front and rear valve seats are joined by a left valve seal and a right valve seal extending in the vertical direction, thereby defining the check valve flow path,
The front valve seat extends above the upstream port, and is joined to the front bag sheet with a front extension seal in the extended portion,
The said back valve sheet | seat is extended upwards rather than the said upstream port, and was joined to the said back bag sheet | seat by the back extension part seal | sticker in the extended part. A seat check valve structure is provided.
The invention according to claim 5 of the present application is
One of the protruding length of the upper end of the front valve seat from the upstream port and the protruding length of the upper end of the rear valve seat from the upstream port is longer than either of the other. The seat check valve structure according to Item 4, is provided.
The invention according to claim 6 of the present application is
In addition to the front and rear valve seats, at least one auxiliary valve seat is arranged so as to overlap the front and rear valve seats, and the auxiliary valve seat is arranged before and after the front and rear valve seats or between the front and rear valve seats. The seat check valve structure according to claim 1 is provided.
The invention according to claim 7 of the present application is
A plurality of sealed cells are formed by joining the front and rear bag sheets by a partition seal ,
The flow path connects the plurality of cells and can be electrically connected to the outside of the bag.
The connection portion between the cell and the flow path includes the check valve structure made of a sheet according to any one of claims 1 to 5,
The above-mentioned valve seat is coordinated with two front and rear,
The front valve seat extends in the flow path above the upstream port, and is joined to the front bag sheet by a front extension portion seal in the extended portion,
The rear valve seat extends in the flow path above the upstream port, and is joined to the rear bag seat by a rear extension seal in the extended portion. A bag with a check valve is provided.
The invention according to claim 8 of the present application is
Prepare the front and rear bag seats and the front and rear valve seats,
By joining the front and rear bag sheets with a partition seal, a plurality of sealed cells are formed,
A common flow path is formed by joining the front and rear bag sheets with a passage seal,
The common flow path connects the plurality of cells and can be electrically connected to the outside of the bag.
The connecting portion between the cell and the common flow path comprises the seat check valve structure according to any one of claims 1 to 5,
The front valve seat extends in the common flow path above the upstream port, and is joined to the front bag sheet by a front extension portion seal in the extended portion,
The rear valve seat is extended in the common flow path above the upstream port, and is joined to the rear bag sheet by a rear extension seal in the extended portion,
A non-return check characterized in that a heat-resistant member is arranged between the front valve seat and the rear valve seat when the front extension seal and the rear extension seal are sealed by heat sealing. A method for manufacturing a bag having a valve is provided.
The invention according to claim 9 of the present application is
Before the front and rear valve seats are joined to the front and rear bag sheets, the left valve seal and the right valve seal, which extend in the vertical direction in advance, are joined in advance, thereby The road is defined,
Insert the pre-joined front and back valve seats between the front and back bag sheets,
After sealing the front extension part seal and the rear extension part seal by heat sealing,
8. The method for manufacturing a bag with a check valve according to claim 7, wherein the front and rear bag sheets are joined together by a partition seal and the front and rear bag sheets are joined by a passage seal.
The invention according to claim 10 of the present application is
In the valve seat used for the check valve structure made of the seat according to any one of claims 1 to 5,
At least two of the front and rear valve seats are front and rear strips that extend in the lateral direction.
The above-mentioned front and rear valve seats are joined by a left valve seal and a right valve seal extending in the vertical direction, thereby defining the check valve flow path,
Between the upper ends of the left and right valve seals is the upstream port, between the lower ends of the left and right valve seals is the downstream port,
The front valve seat is provided with a portion that forms the front extension seal by extending upward from the upstream port,
The rear valve seat is provided above the upstream port, thereby providing a portion that forms the rear extension seal.
Provided is a valve seat used in a check valve structure in which a plurality of sets of left and right valve seals are formed side by side on the front and rear valve seats which are the belt-like bodies.

The present invention has been able to provide a seat check valve structure that can reduce the resistance of the fluid flow during the flow of fluid from the upstream to the downstream (forward flow) as well as preventing backflow. . Furthermore, the present invention has been able to provide a seat check valve structure that can effectively obtain a backflow prevention effect even with a short check valve flow path.

In addition, the present invention provides a bag having a plurality of cells so as to be suitable for use as a cushioning material, and capable of inflating the cells with a small resistance during fluid inflow. Was able to.

Further, the present invention provides a method for manufacturing a bag with a check valve, which is a bag provided with a plurality of cells so as to be suitable for use as a cushioning material, and which can inflate the cells with a small resistance during fluid inflow. It was possible to provide.

Furthermore, the present invention is suitable for forming a check valve structure made of a seat that can reduce the resistance of the flow of the fluid in the flow of the fluid from the upstream to the downstream (forward flow) as well as preventing the backflow. A valve seat could be provided.

(A) is the principal part front view of the bag for cushioning materials which concerns on the 1st Embodiment of this invention, (B) is the II line end view of (A), (C) is II- of (A). It is an II line end view. FIG. 3 is a front view of a main part of a valve seat of the same cushioning material bag. It is a front view of the bag for shock absorbing materials concerning the embodiment. (A) shows a state where the cushioning material bag according to the first embodiment is inflated, and is a schematic view of the state seen from line III-III in FIG. 1 (A), and (B) is a comparative example. FIG. 4C is a front view showing a state in which the cushioning material bag of the comparative example is inflated, and is a schematic view of the state seen from line IV-IV in FIG. 4B. (A) is a principal part front view of the cushioning material bag concerning 2nd Embodiment, (B) is an end elevation of the cushioning material bag concerning 3rd Embodiment, (C) is 4th implementation. The principal part front view of the bag for buffer materials which concerns on this form, (D) is a schematic diagram which shows the state which the bag for buffer materials concerning 4th Embodiment inflated, (E) is in 5th Embodiment It is an end view of the cushioning material bag. The manufacturing process of the buffer material bag which concerns on 1st Embodiment is shown, (A) is a front view which shows a 1st process, (B) is explanatory drawing of the apparatus which shows the 1st process, (C) These are front views which show a 2nd process. It is explanatory drawing of the manufacturing apparatus of the bag for buffer materials which concerns on 1st Embodiment. The manufacturing process of the bag for buffer materials which concerns on 5th Embodiment is shown, (A) is a front view which shows a 1st process, (B) is a front view which shows a 2nd process, (C) is a 1st process. It is a front view which shows 3 processes. It is explanatory drawing of the manufacturing apparatus of the bag for buffer materials which concerns on 5th Embodiment. It shows another manufacturing process of the cushioning material bag according to the fifth embodiment, (A) is a front view showing the first process, (B) is a front view showing the second process, (C). These are front views which show a 3rd process. It is a principal part front view of the bag for buffer materials which concerns on 6th Embodiment. (A) It is principal part sectional drawing of the bag with a filter which concerns on 7th Embodiment, (B) is a front view which shows the manufacturing process of the bag with a filter. (A) is a principal part front view of the bag for cushioning materials concerning the 8th Embodiment of this invention, (B) is the VV line end view of (A), (C) is VI- of (A). It is VI line end elevation. (A) It is a principal part front view of the bag for buffer materials which concerns on 9th Embodiment, (B) It is a principal part front view of the bag for buffer materials which concerns on 10th Embodiment.

Embodiments of the present invention will be described with reference to the drawings.

This embodiment is a soft synthetic resin bag provided with a check valve 11 and is particularly suitable for use as a cushioning material. As shown in FIG. 3, this bag includes a large number of cells 51, and each cell 51 is sealed with air, and each cell 51 is provided with a check valve 11.

As shown in FIGS. 1A to 1C, the cushioning material bag includes two front and rear bag sheets 12 (a front bag sheet 13 and a rear bag sheet 14) and two front and rear valve sheets 15 ( A front valve seat 16 and a rear valve seat 17). Specifically, the overall shape of the bag is defined by the front bag sheet 13 and the rear bag sheet 14 arranged in the front-rear direction, and the front valve sheet 16 and the rear valve sheet are provided between the front bag sheet 13 and the rear bag sheet 14. 17 is coordinated.

Briefly describing the overall configuration of the cushioning material bag, the sealed sheet 51 is formed by joining the bag sheet 12 with the partition seal 42. A plurality of these cells 51 are arranged in the horizontal direction. More specifically, a partition seal 42, left and right side seals 43, an upper seal 44 provided at the upper part of the left and right side seals 43, and a lower seal 45 connecting the lower portions of the left and right side seals 43 are provided. The cells 51 are defined by these seals. The shape of the cell 51 is a quadrangular shape, but the shape can be appropriately changed to other polygonal shapes, circular shapes, elliptical shapes, irregular shapes, and the like. In this example, one side seal 43 is formed between adjacent cells 51, and the left and right side portions of adjacent cells 51 are shared by one side seal 43. An independent side seal 43 can be formed for each cell 51. In that case, two side seals 43 are formed between the adjacent cells 51. A cut line such as a perforation can be formed between the two side seals 43. Accordingly, an appropriate number of cells 51 can be separated and used by cutting the cut line. Further, the folding seal 49 may be formed in each cell 51. The folding seal 49 is obtained by joining the front bag sheet 13 and the rear bag sheet 14 with a gap that allows air to be conducted between the side seal 43 and the side seal 43, so that even after the air is filled. The bag can be easily folded.

These cells 51 communicate with each other through a common flow path 52. The common flow path 52 is formed between the passage seal 46 and the upper seal 44 by joining the front bag sheet 13 and the rear bag sheet 14 with a passage seal 46 extending in the lateral direction. The common flow path 52 connects a plurality of cells 51, and a flow path port 53 is opened outside the bag. When a fluid such as air is introduced from the flow path port 53, the fluid flows from the common flow path 52 to each cell 51.
A check valve 11 is formed at a connection portion between the common flow path 52 and the cell 51.

The check valve 11 is constituted by the two front and rear valve seats 15 (the front valve seat 16 and the rear valve seat 17), and the check valve is interposed between the front valve seat 16 and the rear valve seat 17. A flow path 21 is formed. The check valve flow path 21 forms a check valve structure that allows passage of fluid such as air from the upstream port 22 to the downstream port 23 only in one direction and does not allow reverse movement in the reverse direction. Speaking of the bag as a whole, inflow (forward flow) of fluid from the common flow path 52 into the cell 51 is allowed, and outflow (back flow) of fluid from the cell 51 to the common flow path 52 is prevented.

The front valve seat 16 and the rear valve seat 17 are joined by a valve seal 31 (left valve seal 32, right valve seal 33) extending in the vertical direction, and the space between the left valve seal 32 and the right valve seal 33 is between the left valve seal 32 and the right valve seal 33. It becomes the check valve flow path 21. The upstream port 22 is between the upper ends of the left valve seal 32 and the right valve seal 33, and the downstream port 23 is between the lower ends of the left valve seal 32 and the right valve seal 33.

FIG. 2 shows the valve seat 15 (the front valve seat 16 and the rear valve seat 17) before being attached to the bag seat 12, and the valve seal 31 will be described in more detail with reference to this figure.

The valve seal 31 (the left valve seal 32 and the right valve seal 33) extends in the vertical direction from the upstream port 22 toward the downstream port 23, and may be straight lines parallel to each other. In order to increase the effect of prevention, the distance between the left and right is gradually reduced from the upstream port 22 toward the downstream port 23. In this example, four stages of a first stage part 35, a second stage part 36, a third stage part 37, and a fourth stage part 38 are formed from the upstream side. You can change the number. In this example, each stage (the 1st step part 35, the 2nd step part 36, the 3rd step part 37, the 4th step part 38) is formed in the right-and-left object, and is arranged in parallel mutually. Each stage (the first stage part 35, the second stage part 36, the third stage part 37, and the fourth stage part 38) has the same length on the left and right, but may have a different length. Alternatively, either one of the left valve seal 32 and the right valve seal 33 may be a straight line without a step, and a step may be formed only on the other. In this example, the blank portions 48 are formed so that the heat seal widths are substantially equal. However, the blank portions 48 may be heat-sealed without providing the blank portions 48. Further, in this example, the outer sides of the left valve seal 32 and the right valve seal 33 are extended in a straight line up and down, but as shown in FIG. Alternatively, the width of the heat seal may be made substantially equal by forming a step.

Returning to FIG. 2 and continuing the description, in this example, a lower end valve seal 34 extending in the lateral direction toward the right valve seal 33 is formed at the lower end of the left valve seal 32. The lower end valve seal 34 is provided in order to more reliably prevent the backflow by further narrowing the downstream port 23, but may be omitted. Further, instead of or in combination with the lower end valve seal 34, an independent point seal can be formed between the left valve seal 32 and the right valve seal 33 or on the downstream side of the downstream port 23.

Further, in this example, the heat resistant ink 47 is applied to the upstream port 22. The heat-resistant ink 47 performs heat sealing when the valve sheet 15 is attached to the bag sheet 12, but prevents the upstream port 22 from being closed by the heat sealing.

The bag sheet 12 (the front bag sheet 13 and the rear bag sheet 14) includes a projecting portion 18 (a front projecting portion 19 and a rear projecting portion 20) extending further upward than the upstream port 22. As shown in FIGS. 1A to 1C, the front projecting portion 19 is joined to the front bag sheet 13 by a front extending portion seal 40, and the rear projecting portion 20 is rear to the rear bag sheet 14. Joined by the extension seal 41. The front projecting portion 19 and the rear projecting portion 20 are not joined, but are simply overlapped. In this example, the extension portion seal 39 (the front extension portion seal 40 and the rear extension portion seal 41) is implemented as being continuous laterally, but may be provided intermittently. When providing intermittently, as shown to FIG. 5 (A), it is desirable to have the length above the upstream opening 22 and the length of the width of the upstream opening 22 or more.

Thus, by providing the protrusion 18 and joining the bag sheet 12 with the extension seal 39, the effect of reducing the resistance during forward flow can be achieved. Specifically, before the fluid such as air is introduced from the flow path port 53, the bag sheet 12 and the valve seat 15 are lightly in close contact with each other. Then, by introducing a fluid such as air from the channel port 53, the common channel 52 first swells in a cylindrical shape. Here, the front projecting portion 19 is joined to the front bag sheet 13 by the front extending portion seal 40, and the rear projecting portion 20 is joined to the rear bag sheet 14 by the rear extending portion seal 41. As the front bag sheet 13 and the rear bag sheet 14 are separated by the cylindrical expansion, the front projecting portion 19 (that is, the front valve seat 16) and the rear projecting portion 20 (that is, the rear valve seat 17) are separated. As a result, the upstream port 22 is in an open state, and the fluid smoothly flows into the check valve flow path 21 so that the resistance during forward flow can be reduced. In particular, in this example, the heat resistant ink 47 is used because the upstream port 22 is not blocked by heat sealing. However, the upstream port 22 may be blocked by the influence of heat and pressure, and the upstream of the fluid may be introduced due to the introduction of fluid. There is great resistance to opening the mouth 22. However, in the present invention, as described above, the upstream port 22 is opened due to the swelling of the common flow path 52, so that even when blocking occurs, the fluid flows into the check valve flow path 21 with a small resistance. be able to. Specifically, in this type of cushioning material bag with a check valve, which has been put into practical use today, since air inflow resistance is large, it was necessary to introduce air using an electric pump. In the embodiment of the present application, it is possible to inflate not only a manual pump but also a person's exhalation.

In addition, although the protrusion length of the front protrusion part 19 and the rear protrusion part 20 may be the same length, as shown to FIG. 5 (B), you may make it mutually differ. Thereby, the upstream port 22 becomes easier to open. In this case, the front extension part seal 40 and the rear extension part seal 41 can be formed at the same position, or can be formed at different positions.

As described above, the fluid such as air that has entered the check valve passage 21 passes through the check valve passage 21 that narrows in stages, and flows out from the upstream port 22 into the cell 51. Thereby, the overlapped front bag sheet 13 and rear bag sheet 14 swell in a cylindrical shape (see FIG. 4A). Here, the front valve seat 16 and the rear valve seat 17 are joined to the front bag sheet 13 and the rear bag sheet 14 by side seals 43 at both left and right ends. As described above, the front valve seat 16 and the rear valve seat 17 are joined by the valve seals 31 (the left valve seal 32 and the right valve seal 33) extending in the vertical direction. It is not joined to the front bag sheet 13 and the rear bag sheet 14. Therefore, when the front bag sheet 13 and the rear bag sheet 14 swell in a cylindrical shape, the distance between the side seals 43 at the left and right ends is shortened, and the front valve sheet 16 and the rear valve sheet 17 are three-dimensionally formed in the cell 51. Deform. At this time, as described above, the valve seal 31 has a stepwise gap between the left and right sides, and the left and right valve seals are arranged in parallel to each other. Then, by stopping the introduction of fluid, the front valve seat 16 and the rear valve seat 17 can return to the close contact state without difficulty, and backflow is prevented.

On the other hand, as shown in FIG. 4 (B), when the valve seal 31 is formed with an oblique line, a large wrinkle s often occurs, and the deformation tends to be distorted as a whole (FIG. 4 ( C)). Therefore, the front valve seat 16 and the rear valve seat 17 are not in close contact with each other, and the effect of preventing the backflow may be impaired.

The inventor produced and tested the check valve of FIG. 1 and the check valve of FIG. 4B according to the present invention, and tested them. Each check valve has a stable shape as shown in FIG. 4 (A), and it is possible to obtain a good backflow prevention effect without substantially generating wrinkles, whereas FIG. 4 (B). In this check valve, 29 check valves out of 32 left valve seals are deformed into an irregular shape as shown in FIG. I could not. In the check valve of FIG. 1 of the present invention, both dimensions are as follows: the valve seat 15 is 60 mm long, the check valve flow path 21 is 40 mm long, the lateral width between the first step portions 35 is 12 mm, and the second step portion. The lateral width between 36 was 8 mm, the lateral width between the third step portions 37 was 6 mm, and the lateral width between the fourth step portions 38 was 4 mm. In the check valve shown in FIG. 4B, the valve seat 15 is 100 mm long and the check valve passage 21 is 80 mm long. The width of the upper end was 12 mm, and the width of the lower end was 4 mm. The material used was a 30 μm polyethylene sheet. Thus, in the structure of the check valve according to the embodiment of the present invention, a sufficient check effect can be obtained even with an extremely short dimension of 30 to 60 mm, which is used today. It is possible to realize a length less than half of this kind of check valve.

In addition, as shown to FIG.5 (C) (D), you may make it prevent the deformation | transformation of the non-return valve flow path 21 by forming the notch 68 upwards from the lower end of the bag sheet | seat 12. As shown in FIG. .

In addition to the front valve seat 16 and the rear valve seat 17, at least one auxiliary valve seat 69 may be provided as shown in FIG. In the example of the figure, the rear valve seat 17 and the rear bag sheet 14 are coordinated. However, between the front valve seat 16 and the rear valve seat 17, or between the front valve seat 16 and the front bag seat 13. You can also coordinate. In this example, the lengths of the lower ends of the front valve seat 16, the rear valve seat 17, and the auxiliary valve seat 69 are different from each other, but they may be the same length. Also in the example of FIG. 1, the lengths of the lower ends of the front valve seat 16 and the rear valve seat 17 may be different from each other.
Next, the manufacturing method of this bag with a check valve is demonstrated.

First, as shown in FIG. 2, the front valve seat 16 and the rear valve seat 17 are overlapped and joined. At that time, the front valve seat 16 and the rear valve seat 17 are supplied as a continuous web and are intermittently sent in the length direction. The valve seal 31 is heat-sealed on the stopped stage. Although illustration is omitted, this heat sealing can be performed by a conventional method. For example, heat-resistant ink 47 is applied to one of the front valve seat 16 and the rear valve seat 17 in the first stage. Apply. In the second stage, the front valve seat 16 and the rear valve seat 17 are sandwiched between the male mold and the receiving mold forming the valve seal 31, and heat-sealed by heat pressure bonding.

Next, as shown in FIG. 7, before the valve seat roll 58 wound with the valve seat 15 joined to the front valve seat 16 and the rear valve seat 17 and the web-shaped front bag sheet 13 are wound. A bag sheet roll 56 and a bag sheet roll 57 after winding the web-shaped rear bag sheet 14 are prepared, and these are superimposed and sent intermittently.

In the first stage 61, the sheet overlapped between the male mold 63 and the receiving mold 64 is sandwiched between the male mold 63 and the receiving mold 64, and the extension part seal 39 (the front extension part seal 40, The rear extension portion seal 41) is heat sealed. At this time, as shown in FIGS. 6A and 6B, silicon processing is performed between the front valve seat 16 and the rear valve seat 17 so that the front valve seat 16 and the rear valve seat 17 are not bonded. The heat-resistant member 67 made of a manufactured metal plate or the like is inserted.

In the second stage 62, the partition seal 42 (side seal 43, upper seal 44, lower seal 45) and passage seal 46 are sandwiched between the male mold 65 and the receiving mold 66 and heat-sealed, whereby each seal is sealed. This completes the web for the shock absorbing bag.

In addition, although it can be shipped in the above-described web shape, a third stage (not shown) is provided and cut to a suitable length, and the end of the common flow path 52 is closed with a heat seal or the like, It can also be shipped as a bag of appropriate length.

In the above example, after the valve sheet 15 was created in a separate process, bag making was performed in combination with the front bag sheet 13 and the rear bag sheet 14, but the front bag sheet 13, the rear bag sheet 14, the front valve sheet 16, The rear valve seat 17 can be supplied from separate rolls, and the production of the valve seat 15 and the bag making can be performed in a series of steps. FIG. 8 is a schematic view of the process, and FIG. 9 is a schematic view of the apparatus. In the step shown in FIG. 8A, the front extension seal 40, the rear extension seal 41, and the upper seal 44 are placed with the heat-resistant member 67a sandwiched between the front valve seat 16 and the rear valve seat 17. Heat seal. Next, in the process shown in (B), the valve seal 31 (only the lower end valve seal 34 is shown in the figure) is heat-sealed with the heat-resistant member 67b sandwiched between the rear bag sheet 14 and the rear valve sheet 17. To do. In the previous example, the valve seal 31 sealed only between the front valve seat 16 and the rear valve seat 17, but in this example, in addition to the gap between the front valve seat 16 and the rear valve seat 17, The front valve sheet 16 and the front bag sheet 13 are also heat-sealed. Finally, (C) with the heat-resistant member 67 removed, the partition seal 42 and the passage seal 46 (only the passage seal 46 is shown in the figure) are heat-sealed to complete each seal.

In the above example, the front extension part seal 40, the rear extension part seal 41, and the upper seal 44 are heat-sealed at a time, but may be implemented in separate steps. FIG. 10 shows the process. In the process shown in FIG. 10A, the upper seal 44 is heat sealed with the heat-resistant member 67 sandwiched between the front valve seat 16 and the rear valve seat 17. To do. Next, in the step shown in FIG. 10B, the front extension part seal 40 and the rear extension part seal 41 are heated with the heat-resistant member 67a sandwiched between the rear bag sheet 14 and the rear valve sheet 17. While sealing, the valve seal 31 (only the lower end valve seal 34 is shown in the figure) is heat-sealed with the heat-resistant member 67b sandwiched between the rear bag sheet 14 and the rear valve sheet 17. Also in this example, in addition to the space between the front valve seat 16 and the rear valve seat 17, the space between the front valve seat 16 and the front bag sheet 13 is also heat-sealed. Finally, as shown in FIG. 10C, each seal is completed by heat-sealing the partition seal 42 and the passage seal 46 (only the passage seal 46 is shown in the figure) with the heat-resistant member 67 removed. .

In the above example, the extension portion seal 39 (the front extension portion seal 40 and the rear extension portion seal 41) is heat-sealed with the heat-resistant member 67 sandwiched between the front valve seat 16 and the rear valve seat 17. However, instead of the heat-resistant member 67, heat-resistant ink 47 may be applied and heat-sealed. For example, as shown in FIG. 11, this method is effective when the cells 51 are formed above and below the common flow path 52.

Next, the check valve of the present invention can be implemented by arranging the filter 71 at an appropriate position in the flow path. As the filter 71, a sheet-like body having a filtering function, such as a nonwoven fabric, a woven fabric, a knitted fabric, and paper, can be used. An example in which this filter 71 is added is shown in FIG. 12A is a cross-sectional view at the same cutting position as FIG. 1B, and FIG. 12B is an explanatory view of the check valve manufacturing process.
In this check valve, the filter 71 is disposed between the front valve seat 16 and the rear valve seat 17. More specifically, the upper end of the filter 71 is bonded to the front valve seat 16, and the front valve seat 16 and the filter 71 are heat sealed by the upper seal 44 used also in the example of FIG. The lower end of the filter 71 is bonded to the rear valve seat 17. The adhesion to the valve seat 17 is performed by forming the filter seal 72 by heat sealing.

The bag sheet 12 (B) is an explanatory view of the check valve manufacturing process. As shown in this figure, when the upper end of the filter 71 and the front valve sheet 16 are heat-sealed with the upper seal 44, The heat resistant member 67 is arranged on the front side of the upper end of the filter 71 so that the upper end of the filter 71 and the rear valve seat 17 are not heat sealed. Further, when the filter seal 72 is heat sealed, the heat resistant ink 73 is applied to the front valve sheet 16 so that the lower end of the filter 71 and the front valve sheet 16 are not heat sealed.

8 and 9, when the front valve sheet 16 and the rear valve sheet 17 are not heat-sealed in advance and are overlapped and joined to the front bag sheet 13 and the rear bag sheet 14, Although the description has been made on the assumption that the filter 71 is also supplied and heat-sealed, a method of pre-sealing the front valve seat 16 and the rear valve seat 17 as shown in FIGS. However, the filter 71 is supplied when the front valve seat 16 and the rear valve seat 17 are heat-sealed in advance, and the front valve seat 16, the rear valve seat 17 and the filter 71 are joined. A bag body with a check valve may be completed by manufacturing a product and then supplying it between the front valve seat 16 and the rear valve seat 17 and heat-sealing. In FIG. 12, parts that are substantially the same as those in the previous embodiment are given the same reference numerals, and descriptions thereof are omitted.

In each of the above-described embodiments, the two valve seats of the front valve seat 16 and the rear valve seat 17 are used, but the present invention can also be implemented using only one valve seat 15. FIG. 13 shows this example. The basic structure is the same as that of the example of FIG. 1, and only one valve seat 15 is used as a valve seat. In addition, about the substantially same part as the example of FIG. 1, the description is abbreviate | omitted using the same code | symbol.
In this example, the space between the valve seat 15 and the front bag sheet 13 becomes the check valve flow path 21, and the valve seat 15 and the front bag are formed by the valve seal 31 including the lower end valve seal 34. The seat 13 is heat-sealed to form a check valve shape. The front bag sheet 13, the rear bag sheet 14, and the valve sheet 15 are bonded by the partition seal 42 including the side seal 43, the upper seal 44, and the lower seal 45, thereby defining the shape of the storage chamber. At that time, the heat-resistant ink 47 is applied to the valve seat 15 so that the upstream port 22 is not heat-sealed and is kept open. The portion of the valve seat 15 above the upstream port 22 is heat-sealed with the rear bag sheet 14 by the extension seal 39.

The shape of the valve seal can be changed as appropriate. An example is shown in FIG. In the example of FIG. 14A, the introduction portion 32a that is the portion of the left valve seal 32 near the inlet 22 and the other-side seal portion 33 approach each other as they go from the upstream side to the downstream side. Thus, it is formed to be inclined. However, the left valve seal 32 bends and extends away from the right valve seal 33 at an intermediate portion 32b located downstream of the introduction portion 32a. The lower end of the intermediate portion 32 b is connected to a lower end valve seal 34, and the lower end valve seal 34 extends in the lateral direction toward the right valve seal 33. Here, a line connecting the tip of the lower end valve seal 34 and the tip of the right valve seal 33 becomes the downstream port 23. A passage extension 24 is formed further downstream than the downstream port 23. The passage extension 24 is defined by the downstream port 23, the downstream side edge 15 a of the one or more valve seats 15, and the virtual line 25. This imaginary line 25 connects the downstream end 33a of the right valve seal 33 and the downstream end 15a of the valve seat 15. In this imaginary line 25, the valve seats 11 and 12 are not adhered to each other, and the air in the check valve passage 21 flows out of the valve seat 15 from the downstream port 23 through the passage extension 24. To do. In FIG. 14A, the imaginary line 25 does not coincide with the extension line of the right valve seal 33. However, as shown in FIG. 14B, the imaginary line 25 is shortened by shortening the lower end valve seal 34. Can be made to coincide with the extension of the right valve seal 33. Moreover, you may make it position the front-end | tip of the lower end valve seal 34 in the said extension line.

As mentioned above, although each said embodiment showed the example which implemented this invention as a bag for cushioning materials, this invention is not restricted to this, What uses the check valve made from various sheet | seats. Applicable. For example, the upstream side of the check valve is arranged outside the bag, and fluid such as air flows from the outside of the bag into the bag through the check valve into the bag, gas storage bag, liquid storage A bag etc. can be illustrated. In addition, the upstream side of the check valve is arranged inside the bag, and fluid such as air is discharged from the inside of the bag to the outside through the check valve, and is used to keep the inside of the bag at a negative pressure from the outside. Examples thereof include storage bags for various articles such as clothing, futons, and foods. In addition, the bag stores articles that generate gas, such as coffee beans, and discharges the generated gas from the inside of the bag to the outside through a check valve to maintain the inside of the bag at a predetermined pressure. Can also be used. In the above embodiment, one check valve is provided for one cell 51. However, a plurality of check valves may be provided for one cell 51. Specifically, in addition to providing one check valve at the inlet of one cell 51, the inside of the cell 51 is also provided with one or more check valves from the inlet toward the back. It is also possible to do.

11 Check valve 12 Bag sheet 13 Front bag sheet 14 Rear bag sheet 15 Valve sheet 16 Front valve sheet 17 Rear valve sheet 21 Check valve flow path 22 Upstream port 23 Downstream port 31 Valve seal 32 Left valve seal 33 Right valve seal 34 Lower end valve seal 39 Extension portion seal 40 Front extension portion seal 41 Rear extension portion seal 42 Partition seal 46 Channel seal 47 Heat resistant ink 51 Cell 52 Common flow channel 53 Channel port

Claims (10)

At least one valve seat is coordinated between the front and rear bag sheets coordinated back and forth,
Between the bag seat and the valve seat, or between the valve seats is a check valve flow path,
In the check valve structure made of a sheet that allows passage of fluid in only one direction from the upstream port to the downstream port of the check valve flow path and prevents back flow from the downstream port to the upstream port,
Sheets that constitute the check valve flow path are joined by a left valve seal and a right valve seal that extend in the vertical direction, thereby defining the check valve flow path,
Between the upper ends of the left and right valve seals is the upstream port, between the lower ends of the left and right valve seals is the downstream port,
By connecting the front and rear bag sheets with a passage seal to the front and rear bag sheets, a flow path that can be conducted to the outside of the bag is formed,
The valve seat extends upward from the upstream port , and is an extended portion of the valve seat that is joined to the bag sheet by an extension seal in the flow path .
The left and right length of the extension part seal is not less than the left and right width of the upstream port,
The lower end of the left valve seal is connected to the lower valve seal,
The lower end valve seal is extended laterally toward the right valve seal,
A line connecting the tip of the lower valve seal and the tip of the right valve seal becomes the downstream port,
A passage extension is formed further downstream than the downstream port,
The passage extension is defined by the downstream port, the downstream edge of the one or more valve seats, and an imaginary line,
The imaginary line connects the downstream tip of the right valve seal and the downstream edge of the valve seat,
A seat check valve structure characterized in that the air in the check valve channel can flow out of the valve seat from the downstream port through a passage extension . 2. The seat check valve structure according to claim 1, wherein the extended portion seal is continuous in a lateral direction . The left and right valve seals are such that the left and right intervals become smaller stepwise from the upstream side to the downstream side of the check valve flow path, and the left and right valve seals are arranged in parallel to each other. The seat check valve structure according to claim 1, wherein the check valve structure is a seat check valve. At least two of the above-mentioned valve seats are coordinated,
Between the front and rear valve seats is a check valve flow path,
The above-mentioned front and rear valve seats are joined by a left valve seal and a right valve seal extending in the vertical direction, thereby defining the check valve flow path,
The front valve seat extends above the upstream port, and is joined to the front bag sheet with a front extension seal in the extended portion,
The said back valve sheet | seat is extended upwards rather than the said upstream port, and was joined to the said back bag sheet | seat by the back extension part seal | sticker in the extended part. Seat check valve structure. One of the protruding length of the upper end of the front valve seat from the upstream port and the protruding length of the upper end of the rear valve seat from the upstream port is longer than either of the other. Item 5. A check valve structure made of a seat according to Item 4. In addition to the front and rear valve seats, at least one auxiliary valve seat is arranged so as to overlap the front and rear valve seats, and the auxiliary valve seat is arranged before and after the front and rear valve seats or between the front and rear valve seats. The check valve structure made of a seat according to claim 1. A plurality of sealed cells are formed by joining the front and rear bag sheets by a partition seal ,
The flow path connects the plurality of cells and can be electrically connected to the outside of the bag.
The connection portion between the cell and the flow path includes the check valve structure made of a sheet according to any one of claims 1 to 5,
The above-mentioned valve seat is coordinated with two front and rear,
The front valve seat extends in the flow path above the upstream port, and is joined to the front bag sheet by a front extension portion seal in the extended portion,
The rear valve seat extends in the flow path above the upstream port, and is joined to the rear bag seat by a rear extension seal in the extended portion. Bag with check valve. Prepare the front and rear bag seats and the front and rear valve seats,
By joining the front and rear bag sheets with a partition seal, a plurality of sealed cells are formed,
A common flow path is formed by joining the front and rear bag sheets with a passage seal,
The common flow path connects the plurality of cells and can be electrically connected to the outside of the bag.
The connecting portion between the cell and the common flow path comprises the seat check valve structure according to any one of claims 1 to 5,
The front valve seat extends in the common flow path above the upstream port, and is joined to the front bag sheet by a front extension portion seal in the extended portion,
The rear valve seat is extended in the common flow path above the upstream port, and is joined to the rear bag sheet by a rear extension seal in the extended portion,
A non-return check characterized in that a heat-resistant member is arranged between the front valve seat and the rear valve seat when the front extension seal and the rear extension seal are sealed by heat sealing. Manufacturing method of bag provided with valve. Before the front and rear valve seats are joined to the front and rear bag sheets, the left valve seal and the right valve seal, which extend in the vertical direction in advance, are joined in advance, thereby The road is defined,
Insert the pre-joined front and back valve seats between the front and back bag sheets,
After sealing the front extension part seal and the rear extension part seal by heat sealing,
8. The method for manufacturing a bag with a check valve according to claim 7, wherein the front and rear bag sheets are joined together by a partition seal and the front and rear bag sheets are joined by a passage seal. In the valve seat used for the check valve structure made of the seat according to any one of claims 1 to 5,
At least two of the front and rear valve seats are front and rear strips that extend in the lateral direction.
The above-mentioned front and rear valve seats are joined by a left valve seal and a right valve seal extending in the vertical direction, thereby defining the check valve flow path,
Between the upper ends of the left and right valve seals is the upstream port, between the lower ends of the left and right valve seals is the downstream port,
The front valve seat is provided with a portion that forms the front extension seal by extending upward from the upstream port,
The rear valve seat is provided above the upstream port, thereby providing a portion that forms the rear extension seal.
A valve seat used in a check valve structure, wherein a plurality of sets of left and right valve seals are formed side by side on the front and rear valve seats which are the belt-like body.

Images