WO2007004273A1

WO2007004273A1 - Structure of airflow channel of sealing bag, sealing bag, and method of producing sealing bag

Info

Publication number: WO2007004273A1
Application number: PCT/JP2005/012179
Authority: WO
Inventors: Mikio Tanaka
Original assignee: Mikio Tanaka
Priority date: 2005-07-01
Filing date: 2005-07-01
Publication date: 2007-01-11
Also published as: EP1955960A1; US20090028468A1

Abstract

A structure of an airflow channel of a sealing bag has bag sheets (11, 12) and a valve body sheet (31) provided superposed between the bag sheets (11, 12). The valve body sheet (31) has a front section (31a) and a rear section (31b), airflow spaces are formed between the front face bag sheet (11) and the front section (31a) and between the rear face bag sheet (12) and the rear section (31b), and a dead end space is formed between the front section (31a) and the rear section (31b). On one side, relative to the direction of airflow in the airflow channel (3), of the valve body sheet (31), the front section (31a) and the rear section (31b) are integrally joined to close the dead end space, and on the other side, the front section (31a) and the rear section (31b) are separated to open the dead end space.

Description

Specification

Structure of air passage of sealed bag, sealed bag, and manufacturing method of sealed bag

Technical field

TECHNICAL FIELD [0001] The present invention relates to a sealing bag that can be hermetically sealed.

Background art

[0002] Patent Document 1: Japanese Patent Publication No. 2004-531435

[0003] Conventionally, the sealing part can be sealed in an airtight state, and various gases such as air existing in the sealing part are discharged to the outside of the bag to maintain the state, or various gases are supplied to the sealing part. In order to fill and maintain the state, the sealing part and the outside of the bag are connected so as to be able to ventilate, and when the gas is discharged or filled, the gas passage space, which is a space through which the gas passes, is opened and opened. By being closed, a sealed bag can be used that allows the passage of airflow in one direction and blocks the airflow in the other direction.

[0004] As a kind of the above-described sealed bag, a bag body in which a required portion of a flexible resin sheet is bonded with a heat seal or the like to form a sealed portion 102 having a space surrounded by the sheet. The compressed bag 101 that can discharge the gas existing in the sealing portion 102 to the outside of the bag and maintain the state is used.

The compression bag 101 is provided with an opening 103 for taking the article M into and out of the sealing portion 102. Further, the opening 103 is provided with a closing means 104 such as a chuck for sealing the opening 103.

[0005] As an embodiment of the compression bag, there are various types of force. Among them, there is one described in Patent Document 1. A simple illustration of this is a compression bag 101 as shown in FIG. This is because the intermediate sheet 106 is sandwiched between two opposing bag sheets 102a and 102b, and a check valve 105 is provided with an air passage for deaeration between the bag sheets 102a and 102b and the intermediate sheet 106. Formed. The check valve 105 has a check action when the bag sheets 102a and 102b and the intermediate sheet 106 are in close contact with each other.

[0006] This compression bag 101 is a type in which the above-described check valve 105 is integrally formed from the beginning, and a check valve formed separately from the bag body that has been conventionally incorporated is incorporated later. Compression Compared to bags, there is an advantage that can be manufactured in a single process. However, the compression bag 101 is obtained by simply sandwiching the intermediate sheet 106 between the bag sheets 102a and 102b. Therefore, leakage occurs when the bag sheets 102a, 102b and the intermediate sheet 106 are wrinkled. Therefore, the non-returning action is incomplete, and it is difficult to reliably maintain the deaerated state of the sealed portion 102. Met.

[0007] In view of the above problems, the invention of the present application is easy to manufacture and can contribute to cost reduction, and the airtight state of the sealed portion can be held more reliably than the conventional one, It is an object to provide a sealed bag and a method for manufacturing the sealed bag.

Disclosure of the invention

In order to solve the above-described problem, the invention according to claim 1 of the present application is used for the sealing bag 1 that can seal the sealing portion 2 in an airtight state, and the gas present in the sealing portion 2 The bag 2 is connected to the outside of the bag so that air can be vented in order to maintain the state or to fill the sealed portion 2 with gas. 2 has an inner communication part 3a leading to 2 and an outer communication part 3b leading to the outside of the bag, and allows the passage of airflow in one direction and discharges airflow in the other direction when discharging or filling the gas. In the structure of the air flow path of the sealed bag that can be shut off, flexible bag sheets 11 and 12 made of resin and a valve body sheet 31 are used, and the bag sheets 11 and 12 face each other in the front-rear direction. The valve seat 31 is overlapped between the bag sheets 11 and 12 described above. The valve seat 31 has at least a front piece 31a and a rear piece 31b that are overlapped in the front-rear direction, and is located between the front bag sheet 11 and the front piece 31a, and the rear bag sheet. A ventilation space 3x is formed between the front piece 3la and the rear piece 31b, and a dead end space 3y is formed between the front piece 3la and the rear piece 31b. Between the sealing portion 2 and the air passage 3, air can be ventilated by an inner communication portion 3 a provided at least at one place, and at least between the air passage 3 and the outside of the bag. Ventilation is made possible by the outer communication part 3b provided at one place. Between the inner communication part 3a and the outer communication part 3b, there is a part through which the airflow passes through the ventilation space 3x. It has a cross flow part 3c, and the air flow direction in the air passage 3 of the valve body sheet 31 is determined. On one side as a reference, the dead end space 3y is closed by integrating the front piece 31a and the rear piece 31b, and on the other side, the front piece 31a and the rear piece 31a are closed. rear By providing the side piece 31b separated, the dead-end space 3y is opened, and the air bag structure of the sealed bag is provided.

[0009] Further, the invention according to claim 2 of the present application is such that the valve body sheet 31 is formed by folding back one sheet, and is along the longitudinal direction of the valve body sheet 31. One side is a front piece 31a and the other side is a rear piece 31b across the fold part 31c, and a part of the fold part 31c is coordinated to the inner communication part 3a. The air bag structure of the sealed bag according to claim 1 is provided.

[0010] Further, in the invention according to claim 3 of the present application, the valve body sheet 31 is formed by folding back one sheet, and is along the longitudinal direction of the valve body sheet 31. One side is a front piece 31a and the other side is a rear piece 31b across the fold part 31c, and a part of the fold part 31c is coordinated to the outer communication part 3b. The air bag structure of the sealed bag according to claim 1 is provided.

[0011] Further, in the invention according to claim 4 of the present application, in the valve body sheet 31, weak adhesion is imparted to the contact surface 31d which is a surface in close contact with the bag sheets 11 and 12. The structure of the air passage of the sealed bag according to any one of claims 1 to 3, wherein the air bag structure is provided.

[0012] Further, the invention according to claim 5 of the present application uses a flexible sachet bag sheet 11, 12 and a valve body sheet 31, and the front bag sheet 11 and the rear bag sheet 12 facing each other. And a vent portion 3 formed along the at least one side 2a of the seal portion 2 and formed in the air passage 3. In the sealing bag in which the valve body sheet 31 is arranged so as to be sandwiched between the bag sheets 11 and 12, the valve body sheet 31 includes at least the front piece 31a and the rear piece overlapped in the front-rear direction. 31b, and between the front bag sheet 11 and the front piece 31a, and between the rear bag sheet 12 and the rear piece 31b, a ventilation space 3x is formed so as to be able to vent and block, and the front piece A dead end space 3y is formed between 31a and the rear piece 31b, and there is little space between the sealing part 2 and the air passage 3. At least the inner communication part 3a provided at one place allows ventilation, and between the ventilation path 3 and the outside of the bag is the outer communication part 3b provided at least at one place. Ventilation is possible, and there is a cross flow portion 3c between the inner communication portion 3a and the outer communication portion 3b, which is a portion through which airflow passes through the ventilation space 3x. This valve On the one side of the body sheet 31 with respect to the airflow direction in the air passage 3, the dead end space 3y is closed by integrating the front piece 31a and the rear piece 31b. On the other side, there is provided a sealed bag characterized in that the dead end space 3y is opened by separating the front piece 31a and the rear piece 31b.

[0013] Further, in the invention according to claim 6 of the present application, the valve body sheet 31 is formed by folding back one sheet, and is along the longitudinal direction of the valve body sheet 31. One side is a front piece 31a and the other side is a rear piece 31b across the fold part 31c, and a part of the fold part 31c is coordinated to the inner communication part 3a. A sealed bag according to claim 5 is provided.

[0014] The invention according to claim 7 of the present application is such that the valve body sheet 31 is formed by folding back one sheet, and is along the longitudinal direction of the valve body sheet 31. One side is a front piece 31a and the other side is a rear piece 31b across the fold part 31c, and a part of the fold part 31c is coordinated to the outer communication part 3b. A sealed bag according to claim 5 is provided.

[0015] Further, in the invention according to claim 8 of the present application, the sealing portion 2 is a sealing portion extending in the left-right direction, in which at least the bag sheets 11, 12 are bonded to the body. The upper part of the sealing part partition seal 14 defined by the partition seal 14 and the bag side seal 16 that defines the left and right ends of the sealing bag 1, and the air passage 3 is the sealing part section. A sealing part defined by a seal 14 and a bag side seal 16 and at least the above bag sheet 11, 12 adhered to the body and defined by a bottom seal 15 that defines the lower end of the sealing bag 1. The lower seal section 14 is not provided in the inner communication section 3a, and the bottom seal 15 or the bag side seal 16 is the outer communication section 3b. The inner communication part 3a and the outer communication part 3b Provided at a position contact, overlapping Te vertically, Do, characterized in that to provide a sealed bag according to any Re not a, according to claim 5-7.

[0016] The invention described in claim 9 of the present application is characterized in that the spacing member 32 is arranged so as to be sandwiched between the front piece 31a and the rear piece 31b. Of claims 5-8 A sealed bag according to any one of the above is provided.

[0017] Further, in the invention according to claim 10 of the present application, the gap maintaining member 32 is a filamentous body, a nonwoven fabric, a net-like body, a woven fabric, paper, a non-breathable resin sheet, 10. The sealed bag according to claim 9, wherein the sealed bag is one selected from the group consisting of:

[0018] Further, in the invention according to claim 11 of the present application, the sealing portion 2 can be sealed in an airtight state, and the gas existing in the sealing portion 2 is discharged to the outside of the bag, or the state is maintained. An air passage 3 is provided adjacent to the sealing portion 2 so as to be able to fill the sealing portion 2 with gas and maintain the state, and to connect the sealing portion 2 and the outside of the bag so as to allow air to pass therethrough. This air passage 3 has an inner communication portion 3a that communicates with the sealing portion 2 and an outer communication portion 3b that communicates with the outside of the bag, and allows the passage of airflow in one direction when discharging or filling the gas. In the method for manufacturing a sealed bag capable of blocking the airflow in the direction, at least a flexible bag sheet 11, 12 made of a flexible resin that is supplied without any break in the longitudinal direction and a valve body sheet 31 are provided. The above-mentioned valve body seat 31 is used together and extends along the longitudinal direction. Supplied in a folded state with the eye portion 31c as the boundary, and in this folded state, the longitudinal dimension, which is the shorter dimension than the bag sheets 11, 12, is smaller A process in which the valve body sheet 31 is superimposed on the portion of the bag sheets 11 and 12 where the air passage 3 is formed, so as to be sandwiched between the front bag sheet 11 and the rear bag sheet 12. The process of forming the sealing section partition seal 14 and the bottom seal 15 along the longitudinal direction of the sheet 31 and the bag side seal 16 that crosses the lateral direction of each sheet is formed, and the above bag side seal 16 is divided into two. Thus, there is provided a method for manufacturing a sealed bag, characterized in that each of the sheets 11, 12, 31 is cut.

Brief Description of Drawings

FIG. 1 is a plan view showing an embodiment of a compression bag according to the present invention.

FIG. 2 is an exploded perspective view showing a configuration of an embodiment of a compression bag according to the present invention.

[FIG. 3] (A) is an end view of the main part as viewed in the direction of arrows A—A in FIG. 2, showing the air flow in the ventilation path, and (B) is an arrow, BB, in FIG. (C) shows the inner communication part, (A) is a principal part end view in the direction of arrow C-C, (D) shows the outer communication part, (B) It is a principal part end elevation in DD arrow. [FIG. 4] (A) to (C) are plan views of relevant parts showing an embodiment of a compression bag in which the form of the air passage is changed.

FIG. 5 is a plan view showing an example of a compression bag in which the form of the air passage is changed.

FIG. 6 (A) is a plan view showing an embodiment of a compression bag in which a spacing member is arranged in an air passage.

(B) is an end view of the main part in the direction of arrows EE in (A), and (C) is an end view of the main part when a sheet-like body is used as the spacing member.

FIG. 7 is an exploded perspective view showing a configuration of an example of a conventional compression bag.

BEST MODE FOR CARRYING OUT THE INVENTION

[0020] Hereinafter, as an embodiment of the present invention, a description will be given by taking up a compression bag that is used by degassing the sealing portion.

It should be noted that the expressions indicating the position and direction such as “front and rear”, “up and down and left and right” and “vertical and horizontal” described in the claims and the specification of the present invention are based on the illustrated state in order to specify the position. It is determined as a quasi for convenience, and the present invention should not be construed as being limited to the positional relationship as described above.

[0021] As shown in FIG. 1 and FIG. 2, the compression bag 1 in this example includes a bag sheet (front bag sheet 11, rear bag sheet 12) that is a vertically long rectangular shape as a component, and a horizontally long illustrated shape. A valve body sheet 31 having a smaller vertical dimension than the bag sheets 11 and 12 is used.

[0022] Each of the above-mentioned sheets 11, 12, and 31 has flexibility, and in this example, a long sheet that is continuous in the longitudinal direction is used. Positional force S After being bonded by heat sealing or the like, it is cut and formed as a bag with the sealed portion 2 and vent passage 3 defined. As each of these sheets 11, 12, 31, a sheet made of resin is used. Examples of the resin sheet include a plurality of resin films, for example, a film obtained by adhering and laminating a plurality of polyethylene films, a film obtained by adhering a polyethylene film and a nylon film, and the like. A sheet in which a plurality of resin films are laminated in this manner is more common than a sheet made of a uniform material. In addition, the polyethylene film has a heat-sealing property. The nylon film does not have a heat-sealing property. Therefore, when heat-sealing is performed as described later, the polyethylene film in the resin-made sheet is used. It is necessary to carry out the film facing each other.

[0023] As shown in FIG. 2, the outer side portion of the compression bag 1 is constituted by the bag sheets 11 and 12 arranged facing each other in the front-rear direction. The sealing portion 2 is formed between the front bag sheet 11 and the rear bag sheet 12, and has a space in which the article M can be stored. Further, the air passage 3 is configured by further overlapping a valve body sheet 31 between the bag sheets 11 and 12 described above. In the meantime, when deaeration from the space inside the sealing part 2 to the outside of the bag is made, a ventilation space 3x is formed which continues from the sealing part 2 to the outside of the bag so that gas (air) passes through. (See Fig. 3 (A) and (C)). As a result, the gas present in the sealed portion 2 is discharged to the outside of the bag, and in order to maintain this state, the air passage 3 can connect the sealed portion 2 and the outside of the bag in a breathable manner. .

Here, the sealing part 2 in this example defines a sealing part partition seal 14 extending in the left-right direction and the left and right ends of the sealing bag 1 as shown in FIG. The upper side of the sealing part section seal 14 defined by the bag side seal 16 is the upper part in the figure. The sealing section partition seal 14 is a bag sheet 11, 12, which is a sheet arranged in the front-rear direction, and a valve body sheet 31 bonded to the body.

Here, as shown in FIG. 1, the upper end sides of the front bag sheet 11 and the rear bag sheet 12 in the sealing portion 2 are not bonded, and are open portions la. The article M can be taken in and out of the sealing part 2 through the opening la. In this example, the closing means 4 is provided in the opening la, and the opening la can be closed in an airtight state, whereby the sealing portion 2 can be in an airtight state. The closing means 4 of this example is provided with a convex portion on one side of the bag sheets 11 and 12 and a concave portion on the other side, and the opening 21 is formed by fitting the convex portion and the concave portion. A resin-made chuck having a structure capable of being closed is employed, but various closing means 4 are available, not limited to this. Further, in some cases, after the article M is stored in the sealing portion 2 through the opening la, the opening la may be adhered by heat sealing or the like so that it cannot be opened, or the sealing portion 2 is ventilated. In the case of the sealed bag 1 that is used by filling the gas through the passage 3, the opening la may not be provided from the beginning, and the portion through which the gas can be passed may be the ventilation passage 3 alone.

[0026] In addition, the air passage 3 in this example includes the above-described sealing section partition seal 14 and bag side seal. 16 and the lower end of the sealing bag 1, which is defined by a bottom seal 15 extending in the left-right direction in the figure, and is a lower part in the figure than the sealing section partition seal 14. That is, the air passage 3 of this example is formed along the side of the sealing part 2 that is a quadrangle in plan view.

[0027] Here, in the structure of the air passage 3 of the present invention, a heated mold for heat sealing is not pressed except for the portions where the seals 14 to 16 are formed. Even when it is used as the compression bag 1 as in this example, where the path 3 does not adhere to the heat seal, the resistance during deaeration can be made as small as possible. Conventionally, in a compression bag that incorporates a separate check valve, it is affected by the heat of the heat seal when incorporating the check valve and the pressure of the mold for heat sealing. A force in which a problem that a part of the check valve is adhered and becomes degassed is not observed in the present invention. Therefore, with the compression bag 1 of this example, even when a relatively weak person such as a child or an elderly person uses the deaerator, it is possible to deaerate lightly with little resistance. Also, it is impossible for the sealing part 2 to burst.

[0028] The sealing section partition seal 14 is partly interrupted between the sealing section 2 and the air passage 3. In this example, the left end force of the sealing section partition seal 14 and the side seal 16 are spaced apart from each other. This portion is the inner communication portion 3a.

The bottom seal 15 is also partially disconnected between the air passage 3 and the outside of the bag. In this example, the right end force of the bottom seal 15 and the side seal 16 are spaced apart. This portion is the outer communication portion 3b.

As a result, each of the space in the sealed portion 2, the space in the ventilation path 3 (the ventilation space 3x), and the space outside the bag communicates with each other through the inner communication portion 3 a and the outer communication portion 3 b and exists in the sealing portion 2. Gas (air) can be degassed outside the bag.

Note that a cross flow portion 3c is defined between the inner communication portion 3a and the outer communication portion 3b. This cross flow portion 3c is provided so that the airflow flows in the direction along the side 2a of the sealing portion 2, and as will be described later, the bag sheet 11, 12 and the valve seat 31 are brought into close contact with each other. It should have a length along the airflow direction to the extent that the ventilation space 3x is securely closed. In the compression bag 1 of the present example, as shown in FIG. 1, the inner communication portion 3a is provided in the left-right direction at the upper left end of the air passage 3, and the outer communication portion 3b is provided in the left-right direction at the lower right end. The lateral flow portion 3c is provided so as to extend in the left-right direction. In other words, in this example, the inner communication portion 3a and the outer communication portion 3b are provided at positions that overlap in the vertical direction! /, Na! / ヽ.

Since the air passage 3 is configured in this manner, the air flow during deaeration flows from the inner communication portion 3a into the cross flow portion 3c and then flows through the cross flow portion 3c as shown in FIG. On the left side, the direction is changed from the downward direction to the right direction.After flowing to the right in the cross flow part 3c, the right side of the cross flow part 3c is changed from the right direction to the lower direction, and the outer communication part 3b is removed from the bag. To be discharged. On the other hand, when the air passage 3 is blocked, the entire cross flow portion 3c is in close contact between the front bag sheet 11 and the front piece 31a and between the rear bag sheet 12 and the rear piece 31b. It is possible to reliably maintain the airtight state.

[0030] The positional relationship among the inner communication portion 3a, the outer communication portion 3b, and the cross flow portion 3c is not limited to that of the present embodiment, and various changes may be made. For example, as shown in FIG. 4 (A), the outer communication portion 3b may be provided on the right end side of the cross flow portion 3c in the vertical direction in the drawing so that the air is discharged out of the bag without changing the direction of the air flow. Further, as described above, the valve body sheet 31 is not a long sheet that is continuous in the longitudinal direction, but is provided only in a part in the left-right direction of the air passage 3, for example, FIG. As shown in Fig. 2, the inner communication part 3a and the outer communication part 3b are both provided in the vertical direction in the figure, and the direction of the airflow in the cross flow part 3c is not changed. Also good.

Although not shown in the drawings, various forms such as providing the inner communication portion 3a and the outer communication portion 3b at the center in the left-right direction or providing a plurality of them are possible.

Further, as shown in FIG. 5, a detour seal 17 in which the sheets 11, 12, 31 are bonded is provided so as to protrude from the sealing section partition seal 14 and the bottom seal 15 to the air passage 3. The airflow in the cross flow portion 3 c may be bypassed. In the illustrated example, seals inclined at about 45 ° with respect to the direction of the airflow directed from the inner communication part 3a to the outer communication part 3b during deaeration are alternately formed. However, the present invention is not limited to this, and can be implemented in various forms.

[0032] The valve seat 31 provided in the air passage 3 has at least a front piece 31a and a rear piece 31b that are overlapped in the front-rear direction. The valve seat 31 in this example is shown in FIG. As shown, one sheet is folded back in half from the fold portion 31c.

Each of the space between the front bag sheet 11 and the front piece 31a and between the rear bag sheet 12 and the rear piece 31b can be vented and blocked, and as shown in FIG. A ventilation space 3x is formed. At the time of shut-off, as shown in FIG. 3 (D), the entire lateral flow portion 3c, which is between the inner communication portion 3a and the outer communication portion 3b, is located between the front bag sheet 11 and the front piece 31a and the rear surface. The bag sheet 12 and the rear piece 31b are in close contact with each other. The configuration itself in which the air passage 3 is blocked by the close contact between the respective bag sheets 11 and 12 and the valve body sheet 31 also has a conventional force as described in Patent Document 1.

[0033] Here, the present invention differs from a conventional bag of the same type as described in Patent Document 1 between the inner side communication portion 3a and the outer side communication portion 3b between the front side piece 31a and the rear side piece 31b. A feature is that a dead-end space 3y is formed which is open to either one but is not allowed to vent between the communication portions 3a and 3b. Hereinafter, in the valve body sheet 31, the surface facing each bag sheet 11, 12 will be described as a contact surface 31 d, and the surface facing the front piece 31 a and the rear piece 31 b will be referred to as a separation surface 31 e. .

[0034] The valve body seat 31 in this example is formed by being folded back as shown in FIG. The front piece 31a is the center of the valve body sheet 31 and is the upper part of the figure sandwiching the fold part 31c along the longitudinal direction of the valve body sheet 31, and the rear piece 31b is also the lower part of the figure It is. A part of the fold portion 31c is coordinated to the inner communication portion 3a as shown in FIG.

In this example, the valve body sheet 31 may be a superposition of a plurality of force sheets, each of which is a folded sheet. In this case, it is necessary to bond the front piece 31a and the rear piece 31b at the portion corresponding to the fold portion 31c.

[0035] In the present example, the valve seat 31 is integrated with the bag sheets 11 and 12, with the fold portion 3lc, which is the upper side, integrated by the sealing section partition seal 14 except for the inner communication section 3a. The lower side is integrated with the bottom seal 15 except for the outer communication portion 3b, and the left and right sides are integrated with the side seal 16. Here, in this example, the fold portion 31c is a force provided to the full width in the left-right direction of the valve seat 31. This fold portion 31c Is actually exposed only in the portion of the inner communication portion 3a where the sealing section partition seal 14 is not provided. Therefore, there is no fold portion 31c other than the portion coordinated to the inner communication portion 3a, and the front piece 31a and the rear piece 31b remain separated and are integrated by the sealing section partition seal 14. It may be what was done.

Note that this example is for a compression bag 1 that is used after degassing the sealing part 2, and a part of the fold part 31c is coordinated to the inner communication part 3a on the upstream side of the air flow during degassing. However, on the contrary, when the sealing portion 2 is filled with gas, the partial force of the fold portion 31c is coordinated to the outer communication portion 3b opposite to the above. It will be.

[0036] The fold portion 31c of the valve body sheet 31 and the position where the sealing portion partition seal 14 is formed do not necessarily coincide with each other. It may be the one. However, for example, when the fold portion 31c is provided below the sealing section partition seal 14 in FIG. 1, a part of the non-return action of the air passage 3 is caused between the front bag sheet 11 and the rear bag sheet 12. It will be borne by close contact. On the contrary, when the fold portion 31c is provided above the sealing portion partition seal 14 in FIG. 1, the surplus partial force above the sealing portion partition seal 14 in the valve body seat 31 is in the inner communication portion 3a. Air flow may be obstructed. Therefore, as in this example, it is desirable that the fold portion 31c and the sealing portion partition seal 14 are aligned.

[0037] Next, the dead end space 3y of this example is defined by each of the sealing section partition seal 14, the fold section 31c, the bottom seal 15, and the side seal 16, as shown in FIG. 3 (B). Thus, the opening is a space defined only between the front piece 31a and the rear piece 31b in the outer communication portion 3b.

In other words, in the compression bag 1 of this example, the front side piece 31a and the rear side piece 31b of the valve body seat 31 are formed in the inner communication portion 3a on the upstream side with respect to the airflow direction at the time of deaeration in the ventilation passage 3. The dead end space 3y is closed by the fold portion 31c integrated with each other, and the dead end space 3y is separated by separating the front piece 31a and the rear piece 31b in the downstream outer communication portion 3b at the downstream side. Is open.

In this example, since the valve body sheet 31 is formed by folding one sheet back in half from the fold part 31c, the dead end space 3y can be easily formed. Yo Therefore, it can contribute to the reduction of the manufacturing cost of the compression bag 1.

[0038] As described below, the dead-end space 3y reinforces the check action of the air passage 3 by the air entering the air passage 3 from the outer communication portion 3b stagnating in the lateral flow portion 3c. Therefore, as long as it forms a space in which air can stagnate, it can be implemented in forms other than this example. For example, as shown in FIG. 4 (C), the front piece 31a and the rear piece 31b are bonded to each other at the middle portion in the left-right direction of the air passage 3, and the bonded portion 3Π formed in this way is used. Alternatively, a space 3y may be formed between the front piece 31a and the rear piece 31b existing on the right side of the figure.

[0039] Here, in the inner communication portion 3a in the present example, the presence of the fold portion 31c closes the space between the front piece 31a and the rear piece 31b. Therefore, as shown in FIG. 3 (A), the forward airflow F1 that tries to flow out of the bag from the sealing portion 2 during deaeration does not enter between the front piece 31a and the rear piece 31b. The sheet enters between the front bag sheet 11 and the front piece 31a and between the rear bag sheet 12 and the rear piece 31b. Then, as shown in FIG. 3 (C), between the front bag sheet 11 and the front piece 31a of the valve body sheet 31, and between the rear bag sheet 12 and the rear piece 31b of the valve body sheet 31. It expands and flows through the ventilation space 3x (Note that Fig. 3 (C) is exaggerated in the vertical direction in the figure).

[0040] On the other hand, after the deaeration is completed as described above, the air is blocked by the aerodynamic air flow path 3 that makes the air flow path 3 flow backward from the outside of the bag. Specifically, as shown in FIG. 3 (D), the front bag sheet 11 and the close contact surface 31d on the front piece 31a side, and the close contact surface 31d on the rear bag sheet 12 and the rear piece 31b side are in close contact with each other. This is done by closing the ventilation space 3x (FIG. 3 (D) is exaggerated in the vertical direction of the drawing).

[0041] The close contact of each of the sheets 11, 12, 31 when the ventilation space 3x is closed is, in the case of the compression bag 1 as in this example, the inside of the sealing portion 2 is in a reduced pressure state due to deaeration. It is done by becoming. In other words, there is a pressure difference between the outside of the bag (positive pressure) and the inside of the sealing portion 2 (negative pressure), and from this pressure difference, the valve body seat 31 has the sealing portion 2 on the negative pressure side. The attractive force attracted to the side works. Since the valve seat 31 is made of flexible resin, it is easily deformed by the suction force described above, and the front bag sheet 11 and the front piece 31a side contact surface 31d and the rear bag sheet 12 and the rear bag sheet 12 Each of the contact surfaces 31d on the side piece 31b is in close contact. At the same time, it is shown in Fig. 3 (B). In the same way, outside air enters the dead end space 3y in the form of a dead end as airflow F2, and stagnates. By the air stagnating in the dead space 3y, the front piece 31a of the valve body sheet 31 is pressed against the front bag sheet 11, and the rear piece 31b is pressed against the rear bag sheet 12. Accordingly, the close contact between each of the bag sheets 11 and 12 and the valve body sheet 31 is made stronger than the conventional check valve disclosed in Patent Document 1, and a strong check action can be obtained. Therefore, a situation in which the air flow F2 in the reverse direction continues to flow back to the sealing portion 2 without the ventilation space 3x being closed cannot occur, and the ventilation space 3x is reliably closed.

[0042] In the case of the sealed bag 1 in which the sealed portion 2 is filled with gas, the pressure inside the sealed bag 2 is higher than the outside of the bag, contrary to the above. This pressure difference causes a close contact surface 31d on the front bag sheet 11 and the front piece 31a side, and a close contact surface 31d on the rear bag sheet 12 and the rear piece 31b side, as described above. At the same time, the gas filled inside the sealing part 2 always enters the dead-end space 3y without flowing back to the outside of the bag and stagnates. Is made.

[0043] Next, in the front piece 31a and the rear piece 31b of the valve seat 31, the separation surface 31e opposite to the contact surface 31d has a characteristic that the contact surface 31d is less likely to adhere. Thereby, the front piece 31a and the rear piece 31b may be easily separated. For example, among the plurality of resin films constituting the valve body sheet 31, the resin film constituting the separation surface 31 e may be one having a material strength that is less adhesive than other resin films, or the separation surface 31 e It is possible to form irregularities by finishing the surface of the fabric, or to apply a paint for improving the peelability to the separation surface 31e.

[0044] The spacing member 32 may be coordinated between the separation surfaces 31e. The spacing member 32 is arranged in a direction transverse to the airflow passing through the air passage 3, and for example, as shown in FIGS. 6 (A) and 6 (B), the sealing section partition seal 14 and the bottom Filaments that are arranged parallel to the seal 15 are used. Note that the present invention is not limited to the filamentous body as in this example, and may be a sheet-like body as shown in FIG. 6 (C). ).

In the case where a filament is used as the spacing member 32, it is desirable to use a material that also has thermoplastic resin fiber strength, such as polyester resin fiber having heat sealing properties. It is also possible to use a material having natural fiber strength such as cotton, which does not have tossibility. Further, in the case of using a sheet-like body, it may be non-breathable or breathable. For example, a non-woven fabric or a network having a heat-sealing property, such as a thermoplastic resin fiber card. Examples include body and woven fabric. In addition, the sheet-like body which does not have a heat seal property but has a material strength such as paper is also usable without being limited to the resin-made sheet.

[0045] By providing the spacing member 32 in this manner, the bag sheets 11, 12 and the valve body sheet 31 are pressed by the spacing member 32, and the adhesion between the sheets 11, 12, 31 is further strengthened. be able to. Therefore, the air passage 3 can be more easily closed by the close contact between the contact surface 31a of the valve seat 31 and the inner surfaces of the bag sheets 11 and 12 in the portion where the spacing member 32 is arranged. Thereby, the backflow of air in the air passage 3 can be effectively prevented, and the deaerated state of the sealed portion 2 can be maintained for a long time.

[0046] As shown in FIGS. 6 (A) and 6 (B), this spacing member 32 is assumed to have one thread-like body sandwiched between the front piece 31a and the rear piece 31b. However, a plurality of spacing members 32 may be arranged side by side. The same applies to the case of using a sheet-like body as shown in FIG. The spacing member 32 may or may not be bonded to the separation surface 31e of the valve body sheet 31. As for the positional relationship of the spacing member 32 in the air passage 3, as long as it is arranged in a direction crossing the airflow passing through the air passage 3, as in the above example, it is sufficient. In addition to those arranged in parallel with the sealing section partition seal 14 and the bottom seal 15, respectively, it may be modified in various ways even if it is obliquely or curvedly arranged. Can be implemented.

Further, the spacing member 32 does not have to be continuous in the left-right direction, such as the thread-like body shown in FIG. For example, it may be affixed intermittently to the separation surface 31e.

[0047] Here, as in this example, when a filamentous body is used as the spacing member 32, the front bag sheet 11, the rear bag sheet 12, and the valve body sheet 31 are stacked in the manufacturing process described later. Before the process, it is not necessary to supply the long spacing member 32 in parallel to the longitudinal direction for each of the sheets 11, 12, 31. Since it can supply freely, it is advantageous on the layout of a manufacturing apparatus.

[0048] In addition to what has been described above, as the spacing member 32, the inner surfaces of the bag sheets 11, 12 described above It is also possible to use a material force that generates an urging force in a direction to widen the distance between 11a, 12a and the separation surface 31e of the valve seat 31. Specifically, when the spacing member 32 is a sheet-like body, a urethane foam sheet that generates a repulsive force in the thickness direction can be exemplified. Alternatively, the spacing member 32 may be a folded sheet, and for example, the urging force may be reduced by separating a part of the spacing member 32 from the other part of the crease. It may be emitted.

Thus, by making the spacing member 32 generate an urging force, the contact surfaces 31a of the valve seat 31 can be more closely contacted, and the airflow passage space 3a is effectively closed, Can be prevented from flowing backward.

[0049] Contrary to the above, regarding the close contact surface 31d, it is assumed that weak adhesiveness is imparted, that is, having close contact characteristics, effectively closes the air passage 3. This is also desirable. For example, among the plurality of resin films constituting the valve body sheet 31, the resin film constituting the adhesion surface 3 Id, which is the surface facing each bag sheet 11, 12, is compared with other resin films. By using a material with good adhesion, so-called blocking ability, or by arranging an inert liquid such as silicone oil on the adhesion surface 3 Id in an amount that does not inhibit degassing, etc. The valve body sheets 31 can be easily adhered to each other, and the backflow of air in the air passage 3 can be effectively prevented.

Further, a sheet capable of absorbing liquid may be used as the valve body sheet 31, and the valve body sheet 31 may be used by impregnating an inert liquid such as silicon oil. According to this, the blocking property can be improved by utilizing the surface tension of the soaked liquid.

[0050] Next, a manufacturing method will be described taking the compression bag 1 shown in FIG. 1 as an example. In the production of the compressed bag 1 of this example, the above-described bag sheets 11 and 12 and the valve body sheet 31 use a flexible sheet that is continuous in the longitudinal direction and is continuous in each process. Then, processing such as heat sealing and cutting is performed sequentially.

[0051] First, the closing member 4 is attached by heat sealing to the upper end portion of the front bag sheet 11 and the rear bag sheet 12, which is the portion that becomes the opening la of the compression bag 1 after completion. In this example, the closing member 4 is a chuck in which a convex portion is arranged on one side of the bag sheets 11 and 12, and a concave portion is arranged on the other side. Similarly, the longitudinal direction It is supplied to each process continuously without a break.

Simultaneously with the attachment of the closing member 4, the valve body sheet 31 is overlaid on the front bag sheet 11 and the rear bag sheet 12. In this state, the sealing section partition sheet 14, the bottom sheet sheet 15, and the side sheet sheet 16 force S are simultaneously formed and the sheets 11, 12, 31 force S are bonded. Next, each of the sheets 11, 12, 3 1 and the closing means 4 is cut so as to equally divide the side seal 16 described above, whereby the compression bag 1 is completed.

[0053] In the method for manufacturing the compression bag 1 according to the present invention, the sheets 11, 12, 31 and the closing means 4 which are continuous in the longitudinal direction are used and continuously supplied to each step, and heat sealing or cutting is performed. Since the compression bag 1 is formed one after another by processing such as the above, a complicated manufacturing process is not required, such as a conventional compression bag incorporating a separate check valve. Manufacturing is relatively easy and manufacturing costs can be reduced.

[0054] The present invention has the following excellent effects.

In the invention according to claim 1 of the present application, the ventilation space 3x is formed between the front bag sheet 11 and the front piece 31a and between the rear bag sheet 12 and the rear piece 31b so as to be able to vent and block. At the same time, a dead-end space 3y is formed between the front piece 31a and the rear piece 31b, so that air to flow back into the dead-end space 3y stagnate. Adhesive strength between the bag sheets 11 and 12 and the valve body sheet 31 It is possible to provide a structure of an air passage for a sealed bag that is made stronger than before and can obtain a strong check action.

[0055] Further, in addition to the above-described effects, the invention according to claims 2 and 3 of the present application is that the valve body sheet 31 is formed by folding back one sheet, so that a dead-end space can be easily formed. 3y can be formed, and the structure of the air passage of the sealed bag with reduced manufacturing cost can be provided.

[0056] Further, in the invention according to claim 4 of the present application, in addition to the effect of the invention according to any one of claims 1 to 3, weak adhesion is imparted to the contact surface 31d of the valve body sheet 31. As a result, it is possible to provide a sealed bag air passage structure that can effectively close the air passage 3.

[0057] Further, in the invention according to claim 5 of the present application, the ventilation space 3x is ventilated between the front bag sheet 11 and the front piece 31a and between the rear bag sheet 12 and the rear piece 31b. Formed to block At the same time, a dead-end space 3y is formed between the front piece 31a and the rear piece 31b, so that the air that flows back into the dead-end space 3y stagnates, and the pressure of the air causes The bag sheets 11 and 12 and the valve body sheet 31 are more firmly adhered to each other than before, and a sealed bag capable of obtaining a strong check action can be provided.

[0058] In addition to the effects of the invention described in claim 5, the invention according to claims 6 and 7 of the present application is such that the valve seat 31 is formed by folding one sheet. As a result, the dead-end space 3y can be easily formed, and a sealed bag with reduced manufacturing costs can be provided.

[0059] Further, in the invention according to claim 8 of the present application, in addition to the effect of the invention according to any of claims 5 to 7, the inner communication portion 3a and the outer communication portion 3b are arranged in the vertical direction. Since there is no overlapping position, when the air passage 3 is shut off, the entire lateral flow part 3c is located between the front bag sheet 11 and the front piece 31a, and between the rear bag sheet 12 and the rear side. Since it is in close contact with the piece 31b, it is possible to provide a sealed bag that can reliably maintain the hermetic state of the sealed portion 2.

[0060] In addition, the invention described in claims 9 and 10 of the present application is sandwiched between the front piece 31a and the rear piece 31b in addition to the effect of the invention described in any one of the above claims 5 to 8. As a result, the bag members 11 and 12 and the valve seat 31 are pressed by the space holding member 32 so that the sheets 11, 12 and 31 are in close contact with each other. It is possible to provide a sealed bag that can be made stronger, can effectively prevent the backflow of air in the air passage 3, and can maintain the deaerated state of the sealed portion 2 over a long period of time.

[0061] The invention according to claim 11 of the present application uses the sheets 11, 12, 31 and the closing means 4 which are continuously continuous in the longitudinal direction, and is continuously supplied to each step, and is heat-sealed or cut. Since the compression bag 1 is formed one after another by processing such as the above, a complicated manufacturing process is not required as in the case of a conventional compression bag incorporating a separate check valve. Thus, it was possible to provide a method for manufacturing a sealed bag that was relatively easy to manufacture and reduced manufacturing costs.

Claims

The scope of the claims

It is used for the sealing bag (1) that can seal the sealing part (2) in an airtight state, and the gas existing in the sealing part (2) is discharged to the outside of the bag, and the state is maintained.

Alternatively, the sealing part (2) is filled with gas and the sealing part (2) and the outside of the bag are connected in a breathable manner in order to maintain the state.

It has an inner communication part (3a) that communicates with the sealing part (2) and an outer communication part (3b) that communicates with the outside of the bag, and allows the passage of airflow in one direction when discharging or filling the gas. The structure of the air flow path of the sealed bag, which can block the air flow in the direction,

A flexible sachet bag sheet (11, 12) and a valve body sheet (31) are used, and the bag sheet (11, 12) is arranged facing the front-rear direction,

The valve body sheet (31) is overlapped between the bag sheets (11, 12). The valve body sheet (31) is at least a front piece (31a) overlapped in the front-rear direction. A rear piece (31b),

A ventilation space (3x) is formed between the front bag sheet (11) and the front piece (31a) and between the rear bag sheet (12) and the rear piece (31b) so as to allow ventilation and blocking. With

A dead end space (3y) is formed between the front piece (31a) and the rear piece (31b).

Between the sealing part (2) and the ventilation path (3), ventilation is possible by the inner communication part (3a) provided in at least one place.

Between the air passage (3) and the outside of the bag, the outer communication part (3b) provided in at least one place allows ventilation.

Between the inner communication part (3a) and the outer communication part (3b), there is a cross flow part (3c) that is a part through which air flows through the ventilation space (3x).

The front piece (31a) and the rear piece (31b) are integrated on one side of the valve body seat (31) with respect to the airflow direction in the air passage (3). Has closed the dead-end space (3y) above,

On the other side, the dead end space (3y) is opened due to the separation of the front piece (31a) and the rear piece (31b). Road Construction.

[2] The above-mentioned valve body sheet (31) is formed by folding back one sheet, and sandwiches a fold portion (31c) along the longitudinal direction of the valve body sheet (31), The side is the front piece (31a), the other side is the rear piece (31b),

2. The air bag structure of a sealed bag according to claim 1, wherein a part of the fold portion (31c) is coordinated with the inner communication portion (3a).

[3] The above-mentioned valve body sheet (31) is formed by folding back one sheet, and sandwiches a fold portion (31c) along the longitudinal direction of the valve body sheet (31), The side is the front piece (31a), the other side is the rear piece (31b),

2. The air bag structure of a sealed bag according to claim 1, wherein a part of the fold portion (31c) is coordinated with the outer communication portion (3b).

[4] Of the valve body sheet (31), the adhesive surface (31d), which is the surface in close contact with each bag sheet (11, 12), is provided with weak adhesiveness. Item 4. The structure of the air passage of the sealed bag according to any one of Items 1 to 3.

[5] A flexible resin bag sheet (11, 12) and a valve body sheet (31) are used,

A sealing part (2) formed between the front bag sheet (11) and the rear bag sheet (12) facing each other and capable of sealing in an airtight state;

An air passage (3) formed along at least one side (2a) of the sealing portion (2) and sandwiched between the bag sheets (11, 12) in the air passage (3). In the sealed bag in which the valve seat (31) is arranged as described above,

The valve body seat (31) has at least a front piece (31a) and a rear piece (31b) overlapped in the front-rear direction,

Between the sealing part (2) and the ventilation path (3), ventilation is possible by the inner communication part (3a) provided in at least one place. Between the air passage (3) and the outside of the bag, the outer communication part (3b) provided in at least one place allows ventilation.

On the other side, the dead-end space (3y) is opened due to the separation of the front piece (31a) and the rear piece (31b).

[6] The above-mentioned valve body sheet (31) is formed by folding back one sheet, with the fold portion (31c) along the longitudinal direction of the valve body sheet (31) sandwiched between The side is the front piece (31a), the other side is the rear piece (31b),

The sealed bag according to claim 5, wherein a part of the fold portion (31c) is coordinated to the inner communication portion (3a).

[7] The above-mentioned valve body sheet (31) is formed by folding back one sheet, and sandwiches a fold portion (31c) along the longitudinal direction of the valve body sheet (31), The side is the front piece (31a), the other side is the rear piece (31b),

6. The sealed bag according to claim 5, wherein a part of the fold portion (31c) is coordinated with the outer communication portion (3b).

[8] The sealing part (2) includes at least the bag sheet (11, 12) bonded to the body, a sealing part partition seal (14) extending in the left-right direction, and a sealing bag (1 ) Defined by the bag side seal (16) that defines the left and right ends of the seal), and is the portion above the seal section seal (14).

The air passage (3) is formed by adhering the sealing section partition seal (14) and the bag side seal (16), and at least the bag sheet (11, 12) to the body. The lower part of the seal (14) defined by the bottom seal (15) that defines the lower end of the bag (1),

The sealing section partition seal (14) is not provided in the inner communication section (3a), The bottom seal (15) or bag side seal (16) is not installed on the outer communication part (3b).

The sealed bag according to any one of claims 5 to 7, wherein the inner communication part (3a) and the outer communication part (3b) are provided at positions overlapping in the vertical direction!

[9] The spacing member (3) is sandwiched between the front piece (31a) and the rear piece (31b).

The sealed bag according to claim 5, wherein 2) is coordinated.

[10] The spacing member (32) is one selected from a filamentous body, a nonwoven fabric, a net-like body, a woven fabric, paper, a non-breathable non-breathable sheet, and a force. The sealed bag according to claim 9.

[11] The sealing part (2) can be sealed in an airtight state, and the gas present in the sealing part (2) can be discharged outside the bag and kept in that state, or the sealing part (2) can be filled with gas. Can maintain that state,

An air passage (3) that connects the sealing portion (2) and the outside of the bag so as to allow air to pass therethrough is provided adjacent to the sealing portion (2).

The air passage (3) has an inner communication part (3a) that communicates with the sealing part (2) and an outer communication part (3b) that communicates with the outside of the bag.

In the method for manufacturing a sealed bag, which allows passage of airflow in one direction and blocks airflow in the other direction when discharging or filling the gas,

At least, using a flexible sachet bag sheet (11, 12) and a valve body sheet (31), which are supplied in the longitudinal direction without breaks,

The valve seat (31) is supplied in a folded state with the fold portion (31c) along the longitudinal direction as a boundary. The vertical dimension, which is the shorter dimension than the bag sheet (11, 12), is smaller!

The valve body sheet (31) is superimposed on the portion of each bag sheet (11, 12) where the air passage (3) is formed so that it is sandwiched between the front bag sheet (11) and the rear bag sheet (12). And a sealing section partition seal (14) and a bottom seal (15) along the longitudinal direction of the valve body sheet (31), and a bag side seal (16) crossing the short direction of each sheet. Each sheet (11, 12, 31) is cut in such a way as to bisect the bag side seal (16). And a process for producing a sealed bag.