KR20100090605A - Vinyl bag with bending type check valve - Google Patents

Abstract

PURPOSE: A plastic bag equipped with a flexible check valve is provided to enable a user to use the check valve several times by locking and unlocking the check valve without a separated press apparatus and to enhance sealing efficiency by being dually sealed. CONSTITUTION: A plastic bag equipped with a flexible check valve is comprised of the plastic bag(100) and a check valve. An opening is formed on one side of the plastic bag. The opening of the plastic bag is opened and closed through a zipper part or a separate clip member. The check valve is combined with one side of the plastic bag through an adhesive sheet or using an adhesive. The check valve opens and closes a penetration hole and is comprised of a cover member(210) and an opening member(220).

Description

Plastic bag with bending check valve {VINYL BAG WITH BENDING TYPE CHECK VALVE}

The present invention relates to a plastic bag equipped with a check valve, and in particular, to put food and the like inside to discharge the air inside the plastic bag to the outside through the check valve to seal the inside of the plastic bag in a vacuum state to ensure safe storage It relates to a plastic bag equipped with a bending check valve.

1 is a perspective view of a plastic bag equipped with a conventional check valve, Figure 2 is a cross-sectional view of the main portion of the check valve is mounted in Figure 1, Figure 3 is a check valve is pressed in Figure 2 to close the through hole of the plastic bag It is sectional view of one state.

As shown in Figures 1 to 3, the plastic bag is equipped with a conventional check valve, it consists of a plastic bag 10 and the check valve 20.

A through hole 16 is formed on the top surface of the plastic bag 10, and the check valve 20 is attached to the adhesive sheet 28 on the top of the through hole 16 on the top surface of the plastic bag 10. Are combined by.

The check valve 20 has a dome-shaped protrusion 30 formed therein, and a through hole closed adhesive member 26 for closing the through hole 16 is mounted at the inner center portion of the protrusion 30. A plurality of discharge holes 24 are formed around the protrusion 30.

Therefore, as shown in FIG. 2, the air inside the plastic bag 10 moves through the through hole 16 to the inside of the protruding portion 30, which, in turn, moves to the outside through the discharge hole 24. Discharged.

And, in order to seal the plastic bag 10, as shown in Figure 3 by pressing the protrusion 30 in the direction of the plastic bag 10 using a press or the like, the through-opening closed adhesive member Allow 26 to close the through hole 16.

However, the conventional check valve 20 can be used only once because the press portion 30 is plastically deformed and pressed to the plastic bag 10 by using a press or the like.

That is, although it may be deformed from FIG. 2 to FIG. 3, the protrusion 30 may not be deformed back to FIG. 2 from plastic deformation.

Therefore, there is a disadvantage that the check valve 20 cannot be used repeatedly.

In addition, as shown in FIG. 3, when the protrusion 30 is pressurized to allow the through hole closure member 26 to close the through hole 16, the through hole closure member 26 may be formed. A gap is generated between the top surfaces of the plastic bags 10 so that external air may be introduced into the plastic bags 10.

At this time, an adhesive is applied to the lower portion of the through-opening closing member 26 so that the upper surface of the plastic bag 10 may be adhered well.

However, in this case, if the liquid is accommodated in the plastic bag 10, the liquid penetrates between the lower surface of the through-opening closure member 26 and the upper surface of the plastic bag 10, the through-open closure adhesive The adhesion efficiency of the adhesive for bonding the member 26 and the upper surface of the plastic bag 10 is reduced.

As a result, the through hole closed adhesive member 26 may be separated from the top surface of the plastic bag 10, and thus, external air may be introduced into the plastic bag 10.

In addition, as shown in FIG. 3, in the state where the through hole closure adhesive member 26 closes the through hole 16, the discharge hole 24 and the through hole 16 are closed through the through hole closure. Since only the adhesive surface between the upper surface of the adhesive member 26 and the upper surface of the plastic bag 10 is mutually blocked, the sealing efficiency of the plastic bag 10 is not excellent.

In addition, in the conventional check valve 20 shown in FIGS. 1 to 3, the through-hole closing adhesive member 26 is pressed by a press or the like after the inside of the plastic bag 10 is vacuumed, and thus the through-hole 16 ) Is closed, so that after the completion of the vacuum operation in the open space, the air may flow into the plastic bag 10 through the through hole 16 through the discharge hole 24 between the pressurization operations by a press or the like. There is a problem.

The present invention can be used many times by closing the through-hole of the plastic bag is not elastically deformed check valve is small deformation, double sealing the plastic bag can increase the sealing efficiency of the plastic bag, vacuum operation inside the plastic bag The purpose of this is to provide a plastic bag equipped with a bending type check valve that can be made at the same time the closing operation of the through-holes.

In order to achieve the above object, a plastic bag equipped with a bending check valve of the present invention includes a plastic bag having a through hole formed on one surface thereof; A check valve coupled to one surface of the plastic bag to open and close the through hole, wherein the check valve is attached to one surface of the plastic bag and protrudes convexly in the opposite direction of the plastic bag to elastically deform. And a cover member having a first discharge hole communicating with the through hole in the center of the pressure bending portion; It is made of an elastic material is disposed between the one side of the plastic bag and the cover member from the inside of the pressure bending portion, and consists of an opening and closing member for opening and closing between the through hole and the first discharge hole, the vacuum opening and closing member is vacuum pressure By close contact with the one side of the plastic bag to close the through hole, the pressure bending portion is bent downward in the direction of the opening and closing member by an external force to fix the opening and closing member to one surface of the plastic bag, and downward bending The pressure bending portion is bent upward in the opposite direction of the opening and closing member by the external force is characterized in that the elastic deformation in the original state.

The first discharge hole is in close contact with the opening and closing member when the pressure bending portion is bent downward.

The opening and closing member is formed with a second discharge hole for communicating the through hole and the first discharge hole, the second discharge hole and the through hole is arranged to be eccentric with each other in the up and down direction, the second discharge hole than the first discharge hole Small and disposed inside the first discharge hole, the first discharge hole and the through hole are spaced apart from each other without generating an intersection, and the pressure bending portion is bent downward so that the outer peripheral portion of the first discharge hole is discharged from the second discharge hole. The circumference of the ball is pressed to block the second discharge hole and the through hole, and the first discharge hole is pressurized by the opening / closing member to be closed.

A bending groove is formed around the first discharge hole in the pressure bending part, and an upper part of the pressure bending part in which the first discharge hole is formed is bent downward based on the bending groove to press the opening member.

The second discharge hole is formed by cutting the opening and closing member so that the cutting surfaces are in contact with each other in the free state, the second discharge hole, the cutting surface of the opening and closing member is closed in contact with each other in the free state, the external force The cutting surface of the opening and closing member is bent and opened.

The second discharge hole has a '+' shape.

The opening and closing member is formed in a dome shape, the second discharge hole is formed in the center, and a lower surface of the outer circumferential portion contacts one surface of the plastic bag.

In addition, the opening and closing member is disposed so as to be able to flow in the vertical direction between one surface of the plastic bag and the cover member, the embossing is formed on the inner surface of the pressure bending portion.

A bending groove is formed around the first discharge hole in the pressure bending part, and an upper part of the pressure bending part in which the first discharge hole is formed is bent downward based on the bending groove to press the opening member.

According to the plastic bag equipped with the check valve of the present invention as described above, since the cover member is elastically deformed to press the opening and closing member to close the through hole of the plastic bag, without a separate press device as in the prior art User can lock or release by hand, so the check valve can be used several times with simple structure.

In addition, since the first discharge hole and the through hole are both in close contact with the opening and closing member, the sealing efficiency of the plastic bag can be increased.

In addition, since the pressurized bending portion depresses the opening and closing member, the opening and closing member may be prevented from flowing.

In addition, since the cut surface of the second discharge hole is cut in contact with each other in a free state, when the opening and closing member is in close contact with the plastic bag to close the opening and closing member, inflow of air through the second discharge hole is caused. Can be further blocked.

In addition, the opening and closing member is formed in a dome shape, such as a rubber adsorption plate is in close contact with the one side of the plastic bag can close the through hole more strongly, while the vacuum operation inside the plastic bag is made at the same time the closing operation of the through hole This can be done.

First embodiment

Figure 4 is a perspective view of a plastic bag equipped with a check valve according to a first embodiment of the present invention, Figure 5 is a plan view of a plastic bag equipped with a check valve according to a first embodiment of the present invention, Figure 6 4 is an exploded perspective view of a plastic bag equipped with a check valve according to a first embodiment of the present invention, FIG. 7 is a cross-sectional view taken along line AA of FIG. 4, and FIG. 8 is a vacuum operation by connecting a socket connected to a vacuum pump in FIG. 9 is a cross-sectional view of a state in which the socket is removed after the vacuum is completed in FIG. 8, and FIG. 10 is a cross-sectional view of a state in which the check valve is locked by pressing the cover member in FIG. 9.

As shown in Figure 4 to 10, the plastic bag is equipped with a bending check valve of the present invention, the plastic bag 100, and a check valve 200.

The plastic bag 100 has an opening formed at one side thereof, and a through hole 110 is formed at one surface thereof.

And, although not shown inside, the embossing is formed to facilitate the flow of air.

In addition, the opening of the plastic bag 100 may be formed by opening and closing the zipper portion, it may be formed without a zipper portion may be sealed using a separate clip member.

The check valve 200 is coupled to one surface of the plastic bag 100 by an adhesive sheet or an adhesive to open and close the through-hole 110, the cover member 210 and the opening and closing member 220. Is done.

The cover member 210 is made of a thin synthetic resin film in the elastic force, is attached to one surface of the plastic bag 100, the pressure convex protruding convex in the dome (dome) shape in the opposite direction of the plastic bag (100). The bending part 211 is formed.

In addition, a first discharge hole 212 communicating with the through hole 110 is formed at the center of the pressure bending part 211.

As described below, the pressure bending part 211 may be bent and elastically deformed in an up and down direction by an external force.

The pressure bending part 211 is bent downward in the direction of the opening and closing member 220 by an external force to press and close the opening and closing member 220 to one surface of the plastic bag 100, the following action.

First, the first discharge hole 212 is closed in close contact with the opening and closing member 220, and second, a second formed in the opening and closing member 220 to be described later the outer peripheral portion of the first discharge hole 212 By pressing the circumference of the discharge hole 222, the second discharge hole 222 is further blocked from communicating with the through hole 110, and because the third pressing the pressing member 220 to open and close the opening and closing member 220 ) Can be prevented.

In addition, the pressure bending portion 211 is bent upward in the opposite direction of the opening and closing member 220 by the external force in the downward bent state is elastically deformed to the original state.

The pressure bending part 211 is bent around the spaced apart at a predetermined interval from the first discharge hole 212 in order to be easily elastically deformed downward or upward The groove 213 is formed.

Therefore, the pressure bending part 211 in which the first discharge hole 212 is formed is bent downward and upward based on the bending groove 213 to press or release the opening / closing member 220.

The opening and closing member 220 is made of an elastic material such as silicon is disposed between the one surface of the plastic bag 100 and the cover member 210 from the inside of the pressure bending portion 211, the through hole 110 And a second discharge hole 222 communicating with the first discharge hole 212 is formed.

The opening and closing member 220 may be formed in a dome shape or a flat plate shape in which the central portion protrudes convexly in an upward direction, that is, in the opposite direction of the plastic bag 100.

Preferably, as in the present embodiment, the opening and closing member 220 is made of a dome shape, the lower surface of the outer peripheral portion in a free state to be in contact with one surface of the plastic bag (100).

As shown in FIG. 5 or 7, the first discharge hole 212 and the second discharge hole 222 are disposed at the same position in the center in the vertical direction, and the first discharge hole 212 and the first discharge hole 212. The two discharge holes 222 and the through holes 110 are arranged to be eccentric with each other in the vertical direction.

The second discharge hole 222 is formed smaller than the first discharge hole 212 so that the second discharge hole 222 is disposed inside the first discharge hole 212.

That is, the first discharge hole 212 and the second discharge hole 222 is the intersection with each other, the first discharge hole 212 and the second discharge hole 222 and the through hole 110 are mutually Intersections are spaced apart without occurrence.

The pressure bending part 211 is bent downward so that the outer circumferential portion of the first discharge hole 212 presses the circumference of the second discharge hole 222 so that the second discharge hole 222 and the through hole 110 are formed. ) And the first discharge hole 212 is sealed by pressing an upper part of the opening / closing member 220 to seal the plastic bag 100.

At this time, the pressure bending portion 211 is bent downward to press the plastic bag 100 as well as the opening and closing member 220, as shown in Figure 10 the opposite surface of the plastic bag 100 It is preferable to pressurize enough to protrude in the opposite direction of the check valve 200.

The second discharge hole 222 may be formed in an open hole shape at all times, but is formed by cutting the opening and closing member 220 so that the cutting surface is in contact with each other in a free state.

To this end, in the present embodiment, the second discharge hole 222 is formed in a '+' shape.

Unlike the present embodiment, the second discharge hole 222 may be formed in a '-' shape.

The second discharge hole 222 is closed in contact with the cutting surface of the opening and closing member 220 in a free state, the cutting surface of the opening and closing member 220 is bent open by an external force.

Hereinafter, the operating method of the present invention having the above-described configuration will be described.

The state of the check valve 200 in the state of storing the food and the like of the plastic bag 100 is as shown in FIG.

That is, in this state, a lower surface of the outer circumference of the opening and closing member 220 having a central portion protruding upwards is in contact with one surface of the plastic bag 100 by gravity, and the opening and closing member 220 penetrates the through. Located on top of the ball 110.

In this case, the second discharge hole 222 maintains a closed state because the incision surfaces are in contact with each other, and the second discharge hole 222 and the through hole 110 are in mutually eccentric positions.

That is, the second discharge hole 222 is located at the center, and the through hole 110 is located at the side eccentric from the second discharge hole 222.

The check valve 200 may be directly attached to one surface of the plastic bag 100 by the user, or the check valve 200 may be attached to one surface of the plastic bag 100 from the beginning.

As shown in FIG. 8 to vacuum the inside of the plastic bag 100 in such a state, an upper vacuum pump (not shown) and a socket 230 connected through a hose or the like may be connected to an upper surface of the check valve 200. Posted in

In this case, the socket 230 surrounds the first discharge hole 212 and the second discharge hole 222.

When the vacuum pump is operated, as shown in FIG. 8, the second discharge hole 222 is bent upwardly by the suction surface of the second discharge hole 222 and the second discharge hole 222 is opened by the suction force of the vacuum pump.

Therefore, the air inside the plastic bag 100 is introduced into the lower portion of the opening and closing member 220 through the through hole 110, which passes through the second discharge hole 222 and the first discharge hole 212. After the movement to the socket 230, which is again discharged to the outside via a vacuum pump.

At this time, as the air inside the plastic bag 100 is discharged, the opening and closing member 220 made of an elastic material is gradually lowered toward the plastic bag 100 to close the through hole 110 gradually. .

In addition, when the inside of the plastic bag 100 is vacuumed and the socket 230 is separated from the check valve 200, as shown in FIG. 9, the entire lower surface of the opening / closing member 220 is opened by a vacuum pressure. Is completely in contact with one surface of the plastic bag 100, such as a rubber adsorption plate to close the through hole 110.

That is, since the opening and closing member 220 is lowered while the vacuum operation inside the plastic bag 100 is performed, the closing operation of the through hole 110 is performed at the same time as the vacuum operation of the plastic bag 100 is finished. .

In addition, the second discharge hole 222 is bent in the upward direction is moved to the original position by the elastic restoring force and the vacuum pressure, the cut surface forming the second discharge hole 222 is in contact with each other closed state do.

In this state, the through hole 110 is primarily blocked from the outside by a contact surface between the lower surface of the opening and closing member 220 and the upper surface of the plastic bag 100.

Thereafter, as illustrated in FIG. 10, the user presses the pressure bending part 211 downward to bend.

At this time, the upper portion of the pressure bending portion 211 is bent while elastically deformed in the direction of the opening and closing member 220 on the basis of the bending groove 213.

The outer circumferential portion of the first discharge hole 212 is in close contact with the upper surface of the opening / closing member 220 by wrapping the pressure bending part 211 while surrounding the second discharge hole 222.

As described above, the outer peripheral portion of the first discharge hole 212 is in close contact with the upper surface of the opening and closing member 220, the first discharge hole 212 is closed by the opening and closing member 220.

And, by the pressure bending portion 211 bent downward, the second discharge hole 222 is further pressed in the direction of the plastic bag 100 is further blocked the connection with the through hole 110, the The opening and closing member 220 is fixed without being flown.

In addition, since the pressure bending part 211 presses not only the opening and closing member 220 but also the plastic bag 100 to protrude in the opposite direction of the check valve 200, the opening and closing member 220 is pressed on the vinyl. By strongly adhering to the bag 100, the opening and closing member 220 may be spaced apart from the plastic bag 100 to prevent the through hole 110 from being opened.

The first discharge hole 212 is in close contact with the upper surface of the opening and closing member 220, the outside air is directly introduced into the pressure bending portion 211 through the first discharge hole (212). You can block.

And, the air that can be introduced from the outside through the cut surface of the second discharge hole 222, the bottom surface of the opening and closing member 220 made of a dome shape is formed on one surface of the plastic bag 100, such as a rubber adsorption plate Since the outer peripheral portion of the first discharge hole 212 is pressed against the circumference of the second discharge hole 222, the inflow becomes more difficult.

In addition, the opening and closing member 220 is formed in a dome shape in the opposite direction of the plastic bag 100 in a free state, and prevents the phenomenon that the outer peripheral portion of the opening and closing member 220 is lifted from the plastic bag 100. can do.

As described above, the bent check valve 200 of the present invention, the opening and closing member 220 to close the through hole 110 by a vacuum pressure, and the opening and closing member (2) by the pressure bending portion (211). The plastic bag 100 may be strongly adhered to the plastic bag 100 to close the through-hole 110 so that the plastic bag 100 may be strongly sealed in double.

On the other hand, in order to return the pressure bending portion 211 bent downward, the user presses the pressure bending portion 211 upward.

Then, the pressure bending part 211 is elastically deformed based on the bending groove 213 to be deformed to its original state.

As a result, the first discharge hole 212 is spaced apart from the opening and closing member 220 so that external air may flow into the cover member 210 through the first discharge hole 212.

Of course, even in this state, the opening and closing member 220 is in close contact with one surface of the plastic bag 100 to close the through hole 110, the outside air does not flow into the inside of the plastic bag 100. Does not.

Release of the vacuum is made by opening the opening formed on one side of the plastic bag (100).

When opening the opening of the plastic bag 100 to release the vacuum, the outside air is introduced into the interior of the plastic bag 100, which is again through the through hole 110 and the opening and closing member 220 and the plastic bag It is introduced between one surface of the (100).

Therefore, the opening and closing member 220 of the dome shape is deformed to maintain the state as shown in FIG.

Second embodiment

11 is a cross-sectional view according to a second embodiment of the present invention, FIG. 12 is a cross-sectional view of a state in which a vacuum operation is performed by connecting a socket connected to a vacuum pump to FIG. 11, and FIG. FIG. 14 is a cross-sectional view of the state in which the check valve is locked by pressing the cover member in FIG. 13.

The second embodiment has a difference between the cover member 210 and the opening and closing member 220 compared to the first embodiment, which will be described with reference to this.

As shown in Figures 11 to 14, the plastic bag is equipped with a bending type check valve of the present invention, the plastic bag 100, and the check valve 200.

The plastic bag 100 is the same as the first embodiment, a detailed description thereof will be omitted.

The check valve 200 is coupled to one surface of the plastic bag 100 by an adhesive sheet or an adhesive to open and close the through-hole 110, the cover member 210 and the opening and closing member 220. Is done.

The press member 211 and the first discharge hole 212 are formed in the cover member 210 as in the first embodiment.

In addition, an embossing 215 is formed on an inner surface of the pressure bending part 211, and a bending groove 213 for bending is formed.

The embossing 215 may form a flow path of air when the opening and closing member 220 contacts the inner surface of the pressure bending part 211.

The opening and closing member 220 is disposed between one surface of the plastic bag 100 and the cover member 210, and unlike the first embodiment, the second discharge hole is not formed.

The opening and closing member 220 is disposed to be movable in the vertical direction between one surface of the plastic bag 100 and the cover member 210.

The opening and closing member 220 may be formed in a flat plate shape, or may be formed in a dome shape as in the present embodiment.

As shown in FIG. 11, when the opening and closing member 220 covers the through hole 110, the socket 230 connected to the vacuum pump is disposed on the check valve 200 and the vacuum pump is operated. By the suction force of the vacuum pump, the opening and closing member 220 rises as shown in FIG. 12.

The through hole 110 is opened by the opening and closing member 220 to communicate with the first discharge hole 212.

In this case, the embossing 215 is formed on the inner surface of the pressure bending part 211, and the air introduced into the cover member 210 through the through hole 110 is embossed 215. ) Moves to the first discharge hole 212 through the flow path formed between the, and is discharged to the outside via the socket 230 and the vacuum pump again.

When the vacuum of the plastic bag 100 is completed and the socket 230 is separated from the check valve 200, as shown in FIG. 13, the opening and closing member 220 is lowered by the vacuum pressure to lower the plastic bag. It is in close contact with one surface of the (100).

As a result, the through hole 110 is closed by the opening and closing member 220.

Thereafter, as shown in FIG. 14, the pressure bending part 211 is bent downward to allow the outer circumferential portion of the first discharge hole 212 to press the opening / closing member 220.

Thus, the flow of the opening and closing member 220 is prevented, the first discharge hole 212 is in close contact with the upper surface of the opening and closing member 220 is closed, the through hole 110 is the opening and closing member 220 Close to the bottom of the

Other configurations, structures, and operation methods are the same as in the first embodiment, and a detailed description thereof will be omitted.

The plastic bag equipped with the bending check valve according to the present invention is not limited to the above-described embodiments, and may be variously modified and implemented within the allowable technical spirit of the present invention.

1 is a perspective view of a plastic bag equipped with a conventional check valve,

Figure 2 is a cross-sectional view of the main portion of the check valve is mounted in Figure 1,

3 is a cross-sectional view of a state in which the check valve is pressed in FIG. 2 to close the through hole of the plastic bag;

4 is a perspective view of a plastic bag equipped with a check valve according to the first embodiment of the present invention;

5 is a plan view of a plastic bag equipped with a check valve according to a first embodiment of the present invention;

6 is an exploded perspective view of a plastic bag equipped with a check valve according to a first embodiment of the present invention;

FIG. 7 is a cross-sectional view taken along line A-A of FIG. 4;

8 is a cross-sectional view of a state in which a vacuum operation is performed by connecting a socket connected to a vacuum pump in FIG. 7;

9 is a cross-sectional view of the socket after removing the vacuum in Figure 8,

10 is a cross-sectional view of the check valve is locked by pressing the cover member in FIG.

11 is a cross-sectional view according to a second embodiment of the present invention;

12 is a cross-sectional view of a state in which a vacuum operation is performed by connecting a socket connected to a vacuum pump in FIG.

Figure 13 is a cross-sectional view of the socket is removed after completion of the vacuum in Figure 12,

14 is a cross-sectional view of a state in which the check valve is locked by pressing the cover member in FIG. 13;

<Description of the symbols for the main parts of the drawings>

100: plastic bag, 110: through hole, 200: check valve, 210: cover member, 211: pressurized bending part, 212: first discharge hole, 213: bending groove, 215: embossing, 220: opening and closing member, 222: first 2 discharge hole, 230: socket.

Claims (8)

A plastic bag having a through hole formed on one surface thereof; It is made of a check valve coupled to one surface of the plastic bag to open and close the through hole, The check valve, A cover member attached to one surface of the plastic bag and protruding convexly in the opposite direction of the plastic bag to form an elastic bending member, and a cover member having a first discharge hole communicating with the through hole at the center of the pressure bending part; It is made of an elastic material disposed between the one surface of the plastic bag and the cover member in the pressing bending portion, and made of an opening and closing member for opening and closing between the through hole and the first discharge hole, When the vacuum is completed, the opening and closing member is in close contact with one surface of the plastic bag by a vacuum pressure to close the through hole, The pressure bending part is bent downward in the direction of the opening and closing member by external force to fix the opening and closing member to one surface of the plastic bag by pressing and fixing it. Downward bending the pressurized bending portion is bent upward in the opposite direction of the opening and closing member by the external force is a plastic bag with a bending type check valve, characterized in that the elastic deformation to its original state. The method of claim 1, Bending type check valve is equipped with a plastic bag, characterized in that the first discharge hole is closed in close contact with the opening and closing member when the pressure bending portion is bent downward. 3. The method of claim 2, The opening and closing member is formed with a second discharge hole for communicating the through hole and the first discharge hole, The second discharge hole and the through hole are arranged to be eccentric with each other in the vertical direction, The second discharge hole is smaller than the first discharge hole and disposed inside the first discharge hole, The first discharge hole and the through hole are spaced apart from each other without generating an intersection, The pressure bending part is bent downward so that the outer circumference of the first discharge hole pressurizes the circumference of the second discharge hole to block the second discharge hole and the through hole, and the first discharge hole is pressurized by the opening / closing member to be closed. Plastic bag equipped with a bending type check valve, characterized in that the. 3. The method of claim 2, The pressure bending portion is formed with a bent groove around the first discharge hole, The upper part of the pressurized bending portion in which the first discharge hole is formed is bent downward based on the bending groove to press the opening / closing member. 5. The method according to any one of claims 1 to 4, The second discharge hole is formed by cutting the opening and closing member to be in contact with each other in the free state, The second discharge hole is a plastic bag with a bending check valve, characterized in that the incision surface of the opening and closing member is closed in contact with each other in a free state, the incision surface of the opening and closing member is bent open by an external force. 5. The method according to any one of claims 1 to 4, The opening and closing member is made of a dome (dome) shape, the second discharge hole is formed in the center, the plastic bag with a bending type check valve, characterized in that the lower surface of the outer peripheral portion is in contact with one surface of the plastic bag. The method according to claim 1 or 2, The opening and closing member is disposed to be movable in the vertical direction between one surface of the plastic bag and the cover member, Bending type check valve is equipped with a plastic bag, characterized in that the embossing is formed on the inner side of the pressure bending part. The method of claim 7, wherein The pressure bending portion is formed with a bent groove around the first discharge hole, The upper part of the pressurized bending portion in which the first discharge hole is formed is bent downward based on the bending groove to press the opening / closing member.

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