JP2012131542A - Bag with exhaust valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an airtight packaging bag configured to easily exhaust air without using a tool, after the bag is sealed, and further, suppress the cost increase thereof by using an inexpensive exhaust valve.SOLUTION: The airtight packaging bag 1 with an exhaust valve is configured such that the airtight packaging bag includes the exhaust valve 5 in which one side edge and the other side edge located on the valve outlet side of each of the resin sheets 6a and 6b which are laminated in a pressure contact manner, are connected airtightly and air passages 8 are formed between first and second resin sheets 6a and 6b; the first and second resin sheets 6a and 6b of the air exhaust valve 5 are thermally fused to the peripheral edge parts of one side film and the other side film of the bag body at third and fourth fusing parts, respectively; the one side film is airtightly thermally fused to the other side film in the position other than the third and fourth fusing parts; and then, the valve inlet side of the first resin sheet is thermally fused to the inner surface of the one side film of the bag body 2, and the valve inlet side of the second resin sheet is thermally fused to the inner surface of the other side film.

Description

  The present invention relates to a bag formed of a resin film that is used in a sealed state, and more particularly, to a bag with an exhaust valve provided with an exhaust valve that can be manufactured at low cost so that air can be easily vented.

  A sealing bag formed of a resin film and having a check valve with a simple and inexpensive structure is disclosed, for example, in Patent Document 1 below. The bag of the patent document 1 is for compressive storage of a futon or the like, and an exhaust check valve is composed of an inner valve portion arranged inside the bag and an outer valve portion arranged outside the bag. ing.

  The inner valve portion and the outer valve portion are formed by flattening a series of tubes formed of a resin film. The structure is simple and material costs and manufacturing costs can be reduced.

Japanese Patent No. 2743329

  Sealed bags are often used for packaging fresh food products. In addition to the usual general packaging form that seals without discharging the air that has flowed in when packing the contents, the packaging form is a so-called vacuum pack, gas filling for maintaining the freshness of the contents, Air sealing is used to ensure cushioning.

  Among these, in general packaging forms, it may be required to sufficiently exhaust the air trapped inside the bag. Moreover, in the packaging form which encloses air and gas, since the efficiency of boxing will worsen if a bag swells too much, it may be requested | required to adjust the enclosure amount of air and gas after enclosure.

  In response to this requirement, if the bag is provided with a check valve as disclosed in Patent Document 1, it is possible to open the check valve and adjust the amount of air or gas enclosed. . However, in this method, it is necessary to open the check valve after sealing by inserting a nozzle, and simple exhaust cannot be performed.

  In addition, some existing exhaust valves can be moved to the open position by operating the valve body closed by the force of the spring from the outside, but this valve is complicated and expensive, and the cost of the bag Increase the appearance and handling of the bag.

  Therefore, there is a demand for a sealed packaging bag that can be easily exhausted after sealing without using a tool, and that an inexpensive exhaust valve is used to suppress an increase in cost. This invention makes it a subject to respond to the request | requirement.

In order to solve the above problems, in the present invention, the first and second resin sheets stacked in close contact with each other are hermetically connected to one side edge and the other side edge of the first and second resin sheets, respectively, and a bag is formed between the two sheets. An exhaust valve in which a gas passage that communicates the inside and outside is formed in a sealed packaging bag formed of a resin film,
The first resin sheet of the exhaust valve is disposed on the peripheral edge of the one-side film of the bag body at the third fusion part, and the second resin sheet is disposed on the bag fusion part at the fourth fusion part overlapping the third fusion part. The other side film is heat-sealed over the entire width of the sheet, and the one side film and the other side film of the bag body are heat-sealed in an airtight manner at positions other than the third and fourth fusing parts. Furthermore, the valve inlet side of the first resin sheet is the inner surface of the one-side film of the bag body, and the valve inlet side of the second resin sheet is the fifth inner surface of the other-side film of the bag body. The bag with the exhaust valve was configured by heat fusion at the sixth fusion part.

The bag entrance may be sealed by heat sealing, or an openable fastener that engages the concave and convex portions may be provided. Preferred forms of this bag are listed below.
(1) The exhaust valve is configured such that one side edges of the first and second resin sheets are connected to each other on the inlet side of the valve.
(2) The exhaust valve is provided at a corner portion of the bag body.
(3) The entire area of the exhaust valve is disposed inside the bag body.
(4) The inlet side of the exhaust valve is disposed inside the bag body, and the outlet side is disposed outside the bag body.
(5) A seventh fusion part for thermally fusing the first resin sheet and the second resin sheet to each other is provided on the outlet side of the exhaust valve, and the gas passage is widened with the seventh fusion part as a partition. Divide into multiple directions.
(6) The first and second resin sheets of the exhaust valves cross each other obliquely from the valve inlet side end portion of the connecting portion of the other side edge of the sheets toward the vicinity of the valve outlet side end portion of the one side edge. A hinge portion corresponding to the position of the bag body is formed, and the exhaust valve is provided at a corner portion of the bag body, one side edge of the first and second resin sheets is along the periphery of the bag body, and the entire area of the hinge portion is formed. Provided in a state of being placed inside the bag body.
(7) Between the first resin sheet and the second resin sheet of the exhaust valve, a filter that prevents the passage of powder particles is folded flat, and one end of the filter is used as the first resin sheet. The ends are provided by being joined to the second resin sheet.
(8) Between the first resin sheet and the second resin sheet of the exhaust valve, a filter is provided in parallel with the first and second resin sheets to prevent the passage of powder particles, and one end and the other end of the filter. Are thermally fused to the first resin sheet and the second resin sheet individually by the eighth and ninth fused portions provided to be separated from each other between the inlet side and the outlet side of the exhaust valve.
(9) The fusing of the first and second resin sheets to the one side film and the other side film of the bag body by the fifth and sixth fusing portions is performed at the edge of one end of the first and second resin sheets. Or, only for the other side edge.
(10) A check valve for introducing gas into the bag body by inserting a nozzle and opening the nozzle is provided.

  In the bag with the exhaust valve of the present invention, the closed state of the exhaust valve is maintained until the internal pressure reaches a certain value. In the closed state, the gas that has entered the bag is prevented from being released to the outside, and the outside air is prevented from flowing into the bag.

  On the other hand, when the internal pressure is increased by pressing the sealed bag by hand, the amount of separation between the one-side film and the other-side film of the bag body increases. Accordingly, the first and second resin sheets of the exhaust valve fused to the one-side film and the other-side film in the fifth and sixth fusion portions are separated from each other, and the separation region of both sheets gradually expands. When the internal pressure exceeds a certain value, the exhaust valve is opened, and the gas in the bag is released to the outside.

  For this reason, the air that naturally flows into the bag when the stored item is packed can be easily extracted without a tool after the bag is sealed.

  In applications where it is required to enclose air to obtain a cushioning effect, oxygen to make use of seafood, inert gas to maintain the freshness of the contents, etc. together with the contents, It becomes possible to adjust the amount of filling without using a suction device.

  Furthermore, the exhaust valve is made of a folded resin sheet, a double-layered resin sheet, or a resin tube that is flattened and partially cut off on one side edge, and requires a material with low material cost. Since the points can be easily heat-sealed and inexpensively produced, the increase in the cost of the bag is also suppressed.

  The operation and effect of the preferred embodiment described above will be described in the section of the embodiment for carrying out the invention.

The top view which shows the 1st form of the bag with an exhaust valve of this invention Sectional drawing along the AA line of FIG. Sectional drawing along the BB line of FIG. Sectional view along line CC in FIG. The perspective view of the exhaust valve provided in the bag of FIG. Sectional drawing along the DD line of FIG. Sectional drawing along the EE line of FIG. Sectional drawing which shows the state which the inlet side of the exhaust valve of FIG. 5 opened The top view which shows the 2nd form of the bag with an exhaust valve of this invention The perspective view of the exhaust valve provided in the bag of FIG. Sectional drawing along the FF line of FIG. The top view which shows the 3rd form of the bag with an exhaust valve of this invention The top view which shows the 4th form of the bag with an exhaust valve of this invention The perspective view of the exhaust valve provided in the bag of FIG. The perspective view which shows the state which the inlet side of the exhaust valve of FIG. 14 opened Partially broken perspective view showing another example of exhaust valve provided with filter

  Hereinafter, an embodiment of a bag with an exhaust valve according to the present invention will be described with reference to FIGS.

  FIGS. 1-7 has shown the 1st form of the bag with an exhaust valve of this invention. The bag 1 with the exhaust valve of the first embodiment is provided with an exhaust valve 5 at a corner portion of the bag body 2.

  The bag body 2 is formed of a resin film such as polyethylene that can be heat-sealed. The resin film 3 processed into a cylindrical shape is flattened and cut into a predetermined length, and a heat-sealing sealing portion 4 along the cutting edge is provided and closed at one end.

  The heat sealing / sealing portion 4 is for airtightly joining the one-side film 3a and the other-side film 3b (see FIG. 2) with which the bag body is overlapped. 3a and the other surface side film 3b are not fused. Instead, the resin sheet constituting the exhaust valve 5 is fused to the one-side film 3a and the other-side film 3b.

As shown in FIG. 5, the exhaust valve 5 folds the material resin sheet cut into a square shape at the intermediate point in the width direction so that the first resin sheet 6 a (folded portion) is placed on the second resin sheet 6 b (non-folded portion). It is piled up. Then, one side edge heat sealing is provided (along the fold line edge) and the other side edge of the valve outlet side of the first fused portion 7 _-1 respectively second fused portion 7 _-2 both resin sheet When the first and second resin sheets 6a and 6b are separated from each other, a gas passage 8 (see FIG. 6) is formed between the two resin sheets to communicate the inside and outside of the bag.

  Although the first resin sheet 6a and the second resin sheet 6b are in close contact with each other, the drawing shows the sheets separated from each other in order to make it easier to understand the positional relationship between the sheets and the fused portion. (The same shall apply hereinafter).

The material constituting the exhaust valve 5 may be two resin sheets or resin tubes. The resin tube may be crushed flat and one side edge may be partially cut off. Folded the material resin sheet, it requires a second fused portion 7 _-2 for connecting the free end of the first resin sheet 6a and the second resin sheet 6b, the first fused portion 7 _-1 It can be omitted.

Flatly crushed resin tube may be first fused portion 7 _-1 is also omitted. However, the exhaust valve that does not require a first fused portion _{7 -1} and the second fused portion _{7 -2} also, by providing its first fused portion _{7 -1} second fused portion _{7 -2,} The adhesion between the first resin sheet 6a and the second resin sheet 6b can be further increased.

The valve inlet side of the first resin sheet 6a and the second resin sheet 6b (the portion located on the inlet side of the gas passage 8 relative to the third and fourth fused portions _7-3 and _7-4 ) is one side of the bag body. The separation operation of the film 3a and the other surface side film 3b can be utilized to separate each other as shown by a chain line in FIG.

  Even when the first resin sheet 6a and the second resin sheet 6b on the valve inlet side are separated to the maximum, the first resin sheet 6a and the second resin sheet 6b on the valve outlet side if the internal pressure of the bag is not more than a predetermined value. When the inner pressure of the bag exceeds a predetermined value, the holding is released and the gas passage 8 is opened.

The first fused portion 7 _-1, (the inlet side. In Figure 1 the upper exhaust valve, in FIG. 5 right side) the second fused portion 7 _-2 and unlike the valve inlet side is provided to extend to. On the valve inlet side, one side edge of the first resin sheet 6a and the second resin sheet 6b may be separated from each other similarly to the other side edge, but the first resin sheet 6a and the second resin are separated on the valve inlet side. When one side edge of the sheet 6b is connected to each other, a force that draws the first resin sheet 6a and the second resin sheet 6b is generated, and the adhesion between the two resin sheets is improved.

  The first resin sheet 6a and the second resin sheet 6b can be formed of the same resin film as the forming material of the bag body. In the illustrated bag 1 with an exhaust valve, both the bag body 2 and the exhaust valve 5 are formed of a polyethylene film having a thickness of 100 μm. However, the material of the material is not limited to polyethylene as long as it is a heat-sealable film.

  Polyethylene has chargeability, and the adsorptive power due to static electricity enhances the adhesion between the first resin sheet 6a and the second resin sheet 6b. Therefore, it is preferable that at least the first resin sheet 6a and the second resin sheet 6b have their mating surfaces formed of polyethylene. The thickness of the material can be selected as appropriate depending on the use of the bag.

Considering the appearance of the bag and the functional stability of the exhaust valve, the exhaust valve 5 is preferably installed at the corner of the bag body 2 (it can also be installed at a position away from the corner of the body 2). Its installation, the first resin sheet 6a to the peripheral portion of one surface side film 3a of the bag body in the third fused portion 7 _-3, fourth fusion of the second resin sheet 6b overlaps the third fused portion 7 _-3 In the attaching part _7-4 , it fuse | fuses over the full width to the peripheral part of the other surface side film 3b of a bag main body (refer FIG. 1, FIG. 3).

As a third, fourth fused portion 7 _{-3, 7-4} thermal fusion sealing portion 4 in a position except for (see FIG. 1) is provided to close the opening on one side of the bag body. Further, the valve inlet side of the first resin sheet 6a is provided on the inner surface of the one surface side film 3a of the bag body 2, and the valve inlet side of the second resin sheet 6b is provided on the inner surface of the other surface side film 3b of the bag body 5, respectively. The sixth fused portions _7-5 and _7-6 are heat-sealed (see FIG. 2).

Fifth, sixth fused portion 7 _-5, is fused by 7 _-6, first, second resin sheet 6a, it is performed only one edge or the other side edge of 6b, strength reduction of the bag is suppressed The However, fifth, sixth fused portion _{7 -5,} fusion in _{7 -6,} first, second resin sheet 6a, be performed on both the end of the edge and the other side edge of 6b of the exhaust valve 5 Function is maintained.

_1-7 of FIG. 1, FIG. 5 is the 7th melt | fusion part which mutually fuses the 1st resin sheet 6a and the 2nd resin sheet 6b. The exhaust valve-equipped bag 1 according to the first embodiment is arranged such that the inlet side of the exhaust valve 5 is disposed inside the bag body 2 and the outlet side is disposed outside the bag body 2, and the seventh melt is placed on a portion placed outside the bag body. A wearing portion _7-7 is provided, and the gas passage 8 is divided into two in the width direction by using the seventh fused portion _7-7 as a partition.

A plurality of the seventh fused portions _7-7 can be provided by shifting the position in the width direction. When the seventh fusion part _7-7 is provided, the exhaust valve 5 can be widened to expedite exhaust. If the width of the exhaust valve 5 is increased without providing the seventh fusion part _7-7 , the valve opening pressure of the exhaust valve 5 decreases and the internal pressure of the bag is maintained within the required range in applications where gas is sealed in the bag. Can be difficult.

  The exhaust valve-equipped bag 1 according to the first embodiment configured as described above is inserted into the bag body 2 through the opening on the side where the exhaust valve 5 is not installed, and then the opening is heat-sealed to be airtight. To seal. When it is required to discharge the air trapped inside, the bag is lightly pressed with a hand or the like.

By the operation, the internal pressure of the bag rises and the installation part of the exhaust valve 5 expands as shown in FIG. Thereby, the separation amount of the one side film 6a and the other side film 6b of the bag body is increased, and the first resin sheet 6a and the second resin sheet 6b are separated on the valve inlet side. At this time, until the internal pressure exceeds a certain value, the contact state of the first and second resin sheets 6a and 6b is maintained between the position of the third and fourth fusion portions _7-3 and _{7-4 and} the outlet. Thus, the closed state of the exhaust valve 5 is maintained. When the internal pressure exceeds a predetermined value, the first and second resin sheets 6a and 6b are pushed apart, the exhaust valve 5 is opened, and the air in the bag is released to the outside.

  Next, when the air is sufficiently released, the pressure is released. As a result, the internal pressure of the bag drops below the valve opening pressure of the exhaust valve 5, the exhaust valve 5 is closed, and the subsequent inflow of air from the outside through the exhaust valve 5 is prevented.

  In addition, when air, oxygen, inert gas, or the like is sealed in the bag for the purpose of creating an air cushion effect or maintaining the freshness of the stored items, a nozzle is inserted into the outlet of the exhaust valve 5 to provide the required gas. Can be filled. The filling amount at that time can be arbitrarily adjusted by discharging the excess amount through the exhaust valve 5 after filling.

  FIGS. 9-11 is the 2nd form of the bag with an exhaust valve of this invention. In the second embodiment of the bag 1 with exhaust valve, the entire exhaust valve 5 is disposed inside the bag body.

As shown in FIGS. 10 and 11, the exhaust valve 5 employed in the second form is a filter 9 that prevents only the passage of the granular material between the first resin sheet 6 a and the second resin sheet 6 b and passes only gas. Is provided. The filter 9 is disposed in parallel with the first resin sheet 6a and the second resin sheet 6b, and is provided at a distance from the third and fourth fused portions _7-3 and _7-4 on the valve inlet side. 8, the 9th fusion parts _7-8 and _7-9 have one end and the other end thermally fused individually to the first resin sheet 6a and the second resin sheet 6b.

  When the filter 9 is present, the bag can be used for the purpose of storing a granular material such as starch. The filter 9 may be a non-woven fabric or a film provided with many fine holes.

  Also in the bag 1 with the exhaust valve of the second form, when the internal pressure exceeds a predetermined value, the amount of separation between the one-side film 3a and the other-side film 3b of the bag body increases, and the first and second resins on the valve inlet side. The seats 6a and 6b are separated and the exhaust valve 5 is opened. Therefore, it is possible to easily adjust the discharge of gas in the bag and the amount of gas filled in the bag.

  In addition, since the other structure of the exhaust valve 5 employ | adopted as the bag of a 2nd form is the same as the bag of a 1st form, description is abbreviate | omitted.

  FIG. 12 shows a third embodiment of the bag with an exhaust valve of the present invention. The exhaust valve-equipped bag 1 according to the third embodiment is provided with a check valve 10 for gas filling. The check valve 10 has two strip-shaped resin sheets in close contact with each other, heat-bonds both sides of the resin sheet, and when the two resin sheets are separated between the fused portions, This is a known check valve disclosed in the above-mentioned Patent Document 1 in which a gas passage for communication is formed.

  The exhaust valve-equipped bag 1 in FIG. 12 is provided at a corner portion of the bag body 2 opposite to the side where the exhaust valve 5 is provided. At this location, the one-side film 3a and the other-side film 3b of the bag main body are joined to the check valve 10, and the two films are not fused together like the exhaust valve installation portion.

  The check valve 10 provided in the bag of FIG. 12 is similar to the exhaust valve 5, but the check valve 10 has a resin sheet fixed to the one side film and the other side film on the valve inlet side. Not. Therefore, the valve closing force increases as the internal pressure of the bag increases, and the valve cannot be opened unless a nozzle or the like is inserted from the outside of the bag. This is a functional difference from the exhaust valve 5.

  The check valve 10 is not required for bags that do not require gas filling. Gas filling can be performed by inserting a blowing nozzle into the gas passage of the exhaust valve 5 from the outside. Therefore, the check valve 10 may not be used even in applications where gas filling is required.

  13 and 14 show a fourth embodiment of the bag with an exhaust valve of the present invention. In the fourth embodiment of the bag 1 with exhaust valve, the entire exhaust valve 5 is installed inside the bag body as in the second embodiment. The difference from the second embodiment is that a check valve 10 is additionally provided and the structure of the exhaust valve 5.

  The exhaust valve 5 employed in the exhaust valve-equipped bag 1 according to the fourth embodiment includes the first and second resin sheets 6a and 6b on one side from the valve inlet side end portion Q1 of the connecting portion on the other side edge. The hinge part 11 which the position mutually cross | intersects diagonally toward the valve exit side edge part Q2 of an edge respond | corresponds is formed.

  The hinge part 11 can be produced by a method such as partially reducing the thickness of the material sheet by pressing a heat ray for heat sealing. The exhaust valve 5 provided with the hinge portion 11 is connected to the corner portion of the bag body 2, one side edge of the first and second resin sheets 6 a and 6 b is along the periphery of the bag body, and the entire area of the hinge portion 11 is It is provided in a state of being arranged inside the bag body 2.

  In an application in which gas is sealed inside together with the stored items, the bag body 2 may be greatly expanded. In the bag in which the exhaust valve 5 is installed at the corner portion, when the bag body 2 is greatly inflated, the first and second resin sheets 6a and 6b on the valve inlet side, as shown in FIG. The side end Q3 and the connecting portion of the other side edge are separated so that the separation amount of the end portion Q4 on the other side edge side is larger than the valve inlet side end portion Q1 of the connecting portion.

  At this time, the first and second resin sheets 6a and 6b are bent at the position of the hinge portion 11, so that the close contact state of the first and second resin sheets 6a and 6b is easily maintained on the outlet side of the exhaust valve 5. Therefore, the valve opening pressure of the exhaust valve 5 is higher than that without the hinge part 11 and when the hinge part 11 is provided across the first and second resin sheets without being inclined. Fluctuations are less likely to occur.

  The filter 9 can also be provided in an exhaust valve having a basic structure. An example is shown in FIG. The exhaust valve 5 in the figure is provided with a sheet-like flexible filter 9 that is flatly folded between the first resin sheet 6a and the second resin sheet 6b to prevent the passage of powder particles. The filter 9 has one end joined to the first resin sheet 6a and the other end joined to the second resin sheet 6b. When the first resin sheet 6a and the second resin sheet 6b are separated by the internal pressure of the bag, Expand and prevent the spillage of the powdered fluid stored in the bag.

  The present invention can also be applied to a bag provided with a fastener having a structure in which concaves and convexes are fitted to hermetically seal the fitting portion, and the inlet can be opened and closed by the fastener.

  An exhaust valve having a structure in which the bag main body and the exhaust valve with a filter described in the second embodiment (width: about 50 mm, length: about 90 mm) are both formed of polyethylene having a thickness of 100 μm and the check valve of the third embodiment is additionally provided. A prototype bag was made. And about 2 kg starch was stored in the bag, and it was piled up. As a result, when the starch was stored, the air that had entered the bag was naturally pushed out by the weight of the product stacked on the day, and hardly remained in the bag. In addition, leakage of the stored starch from the exhaust valve was not confirmed.

  A bag of Embodiments 1 to 4 (the exhaust valve has a width of about 50 mm and a length of about 90 mm) was prototyped, and air was sealed in the bag. Then, after the entrance was sealed, the bag was pressed by hand. As a result, in each bag, when an appropriate pressure was applied, the exhaust valve was opened and the enclosed air was discharged to the outside.

  Moreover, the bag in which no pressure was applied was maintained in an air-sealed state even after several days. Note that the opening pressure of the exhaust valve is the highest in the bag of the fourth form, and it is necessary to perform pressing that takes a little weight to open the exhaust valve.

1 one surface side film 3b the other side film 4 heat-sealed sealing portion 5 exhaust valve 6a second resin sheet ₇ -1 _{to 7 -9} first melting the first resin sheet 6b of the bag of the exhaust valve-equipped bags 2 bags body 3a bag Adhering part to ninth fusion part 8 Gas passage 9 Filter 10 Check valve 11 Hinge part Q1 Valve inlet side end part Q2 of the connecting part of the other side edge of the first and second resin sheets The first and second resin sheets Valve outlet side end Q3 of one side edge Valve inlet side end Q4 of one side edge of the first and second resin sheets Valve inlet side end of the other side edge of the first and second resin sheets

Claims (11)

A gas passage (to connect the inside and outside of the bag between the two sheets, hermetically connecting the one side edge and the other side edge of the valve outlet side of the first and second resin sheets (6a, 6b) stacked in close contact with each other. The exhaust valve (5) in which 8) is formed is provided in a bag body (2) for sealed packaging formed of a resin film,
The first resin sheet (6a) of the exhaust valve (5) is attached to the peripheral part of the one-side film (3a) of the bag body at the third fusion part ( _7-3 ), and the second resin sheet (6b) is attached to the peripheral part. fused over the entire width, respectively the peripheral edge portion of the other surface side film of the bag body in the fourth fused portion overlapping the third fused portion _{(7 -3) (7 -4)} (3b), the third fourth fused portion _{(7 -3, 7-4)} at a position excluding the heat sealed on one side of the opening of the bag body (2) and sealed, the further valve of the first resin sheet (6a) The inlet side is on the inner surface of the one side film (3a) of the bag body, and the valve inlet side of the second resin sheet (6b) is on the inner surface of the other side film (3b) of the bag body. A bag with an exhaust valve configured to be heat-sealed at the fusion part ( _7-5 , _7-6 ).   The bag with an exhaust valve according to claim 1, wherein the exhaust valve (5) is configured such that one side edges of the first and second resin sheets (6a, 6b) are connected to each other on an inlet side of the valve.   The bag with an exhaust valve according to claim 1 or 2, wherein the exhaust valve (5) is provided at a corner portion of the bag body (2).   The bag with an exhaust valve according to any one of claims 1 to 3, wherein the entire area of the exhaust valve (5) is disposed inside the bag body (2).   The bag with an exhaust valve according to any one of claims 1 to 3, wherein an inlet side of the exhaust valve (5) is disposed inside the bag body and an outlet side is disposed outside the bag body. A seventh fusion part ( _7-7 ) for fusing the first resin sheet (6a) and the second resin sheet (6b) to each other is provided on the outlet side of the exhaust valve (5). The bag with an exhaust valve according to any one of claims 1 to 5, wherein the gas passage (8) is divided into a plurality of portions in the width direction with the portion ( _7-7 ) as a partition.   On the first and second resin sheets (6a, 6b) of the exhaust valve (5), the valve outlet side end portion on one side edge from the valve inlet side end portion (Q1) of the connecting portion on the other side edge of those sheets. (Q2) A hinge portion (11) corresponding to each other which crosses obliquely toward the vicinity is formed, and the exhaust valve (5) is formed at the corner portion of the bag body (2) at the first and second resin sheets. The one side edge of (6a, 6b) is along the periphery of a bag main body, and the whole area of the said hinge part (11) was provided in the state arrange | positioned inside a bag main body (2). A bag with an exhaust valve according to any one of the above.   A filter (9) that prevents the passage of powder particles between the first resin sheet (6a) and the second resin sheet (6b) of the exhaust valve (5) is folded flat and one end of the filter. The bag with an exhaust valve according to any one of claims 1 to 7, wherein the first resin sheet (6a) and the other end are joined to the second resin sheet (6b). Between the first resin sheet (6a) and the second resin sheet (6b) of the exhaust valve (5), a filter (9) for blocking the passage of powder particles is provided for the first and second resin sheets (6a, 6b). The eighth and ninth fused portions (7) are provided in parallel with each other, and one end and the other end of the filter (9) are provided apart from each other between the inlet side and the outlet side of the exhaust valve (5). _The bag with an exhaust valve according to any one of claims 1 to 5, wherein the bag is individually heat-sealed to the first resin sheet (6a) and the second resin sheet (6b) by _-8 , _7-9 ). Said fifth, sixth fused portion _{(7 -5, 7 -6)} said by one surface side film of the bag body and (3a) to the other surface side film (3b) first, second resin sheet (6a, 6b) The bag with an exhaust valve according to any one of claims 1 to 9, wherein the heat fusion is performed only on an end edge or other side edge of the first and second resin sheets (6a, 6b) on the valve inlet side.   The bag with an exhaust valve according to any one of claims 1 to 10, further comprising a check valve (10) for inserting a nozzle and opening the valve to introduce gas into the bag.

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