JP6239170B1 - Gas vent valve - Google Patents

Abstract

A degassing valve having good degassing characteristics is provided. A gas vent valve (1) includes a base film (10) having a vent hole (Hb) and a cover film (20) laminated on the base film (10), and is attached so as to close the gas vent hole of the container. Exhaust the gas. The gas vent valve 1 has a pair of adhesion sites Bo in which the base film 10 and the cover film 20 are bonded with the air hole Hb interposed therebetween, and a non-adhesion site Nb between the pair of adhesion sites Bo. When the internal pressure is equal to or higher than a predetermined pressure, the base film 10 and the cover film 20 at the non-adhered portion Nb are separated from each other to form a gas discharge channel, and the gas is discharged from the container through the vent hole Hb. The outer edge of the non-contact part Nb of the cover film 20 has a linear outer edge straight part Lo, and the inner edge of the non-contact part Nb of the base film 10 on the side orthogonal to the gas discharge flow path has a linear inner edge straight part Li. The outer edge straight line portion Lo and the inner edge straight line portion Li are parallel to each other. [Selection] Figure 2

Description

  The present invention relates to a gas vent valve.

  Coffee, miso, pickles, fermented foods, etc. are sealed and stored in containers such as packaging bags in order to keep the food fresh. Since gas is generated from such food, a vent hole is opened in the container to discharge the gas, and a vent valve is installed here. As a valve for venting, there is a label-like venting valve that can be used by simply sticking to a container (for example, Patent Documents 1 and 2).

  As shown in FIGS. 9A to 9C, the conventional gas vent valve 100 has a structure in which a cover film 20 is laminated on a base film 10 having a circular or substantially elliptical vent hole Hb. doing. The base film 10 and the cover film 20 are bonded so as to sandwich the vent hole Hb, and the unbonded portion functions as a gas discharge channel. Normally, the base film 10 and the cover film 20 are in close contact with each other in the part that is not adhered, but when the inside of the container exceeds a predetermined pressure due to the gas stopped in the container, the cover film in the part that is not adhered The gas discharge flow path 20 is formed by separating 20 from the base film 10, and the gas in the container is discharged through the gas discharge flow path from the vent hole Hb and the vent hole Hb.

JP 7-291306 A JP 2006-62277 A

  The degassing valve is required to have a degassing characteristic that can open even at a lower pressure and discharge the gas in the container so that the generated gas does not expand the container.

  This invention is made | formed in view of the said matter, The objective is to provide the degassing valve with a favorable degassing characteristic.

The vent valve according to the present invention is:
A degassing valve comprising a base film having a vent hole and a cover film laminated on the base film, and is attached so as to close the degassing hole of the container, and discharges the gas in the container;
The gas vent valve has a pair of adhesion portions where the base film and the cover film are bonded with the air hole interposed therebetween, and a non-adhesion portion between the pair of adhesion portions,
When the internal pressure of the container is equal to or higher than a predetermined pressure, the base film and the cover film at the non-adhered portion are separated from each other to form a gas discharge channel, and gas is discharged from the container through the vent hole, and the internal pressure When the pressure is below a predetermined pressure, the base film and the cover film of the non-adhered portion are in close contact with each other to prevent gas from flowing into the container,
The base film has only one rectangular or rounded rectangular ventilation hole,
Outer edge of the non-contact deposition site of the cover film has a straight outer straight portion,
It said base wherein said side orthogonal to the gas discharge channel of the non-close adhesion part inner edge of the film has a straight inner linear portion,
The outer edge straight part and the inner edge straight part are parallel,
It is characterized by that.

  Moreover, it is preferable that the perpendicular distance of the said outer edge linear part and the said inner edge linear part is 2-5 mm.

A pair of outer edge straight portions sandwiching the vent hole;
It is preferable to have a pair of said inner edge straight line parts on both sides of the said vent hole.

  Moreover, it is preferable that the sum of the perpendicular distance from one adjacent said outer edge straight part to the said inner edge straight part and the perpendicular distance from the other adjacent said outer edge straight part to the said inner edge straight part is 4-10 mm. .

Further, it is preferable that the predetermined pressure is 72~120mmH ₂ O.

  Moreover, it is preferable to have a viscous fluid film between the base film and the cover film at the non-adhered portion.

  According to the present invention, it is possible to provide a degassing valve having good degassing characteristics.

It is a perspective view which shows the use condition of a gas vent valve. 2A is a plan view of the gas vent valve, FIG. 2B is a cross-sectional view taken along the line AA ′ of FIG. 2A, and FIG. 2C is a cross-sectional view taken along the line BB ′ of FIG. It is. It is a disassembled perspective view of a gas vent valve. It is a top view of the degassing valve which concerns on another form. 5 (A) and 5 (B) are plan views of a gas vent valve according to another embodiment. It is a disassembled perspective view of the gas vent valve which concerns on another form. 7A is a plan view showing a gas vent valve of SA5.0 to SA2.0 in the embodiment, and FIG. 7B is a plan view showing a gas vent valve of SB3.5 to SB2.0 in the embodiment. is there. It is a schematic diagram which shows the measuring method of the opening pressure in an Example. 9A is a plan view showing a conventional gas vent valve, FIG. 9B is a cross-sectional view taken along the line AA ′ of FIG. 9A, and FIG. 9C is a cross-sectional view taken along line BB of FIG. 9A. 'Cross section.

  Hereinafter, the gas vent valve will be described with reference to the drawings. As shown in FIG. 1, the degassing valve 1 is used by sticking so as to block a degassing hole Ha opened in a container Pa that seals food that generates gas during storage, such as coffee, miso, and pickles. It is done.

  The gas vent valve 1 is opened when gas is generated from food in the container Pa and the pressure in the container Pa becomes equal to or higher than a predetermined pressure, and the gas is discharged to the outside of the container Pa. When the pressure is lower than the range, the container is closed and the inside of the container Pa is maintained at a predetermined pressure or lower. Thereby, the gas vent valve 1 exhibits a function of suppressing the expansion of the container Pa and maintaining the freshness of the food filled in the container Pa. In addition, the container Pa in this specification means the whole thing which seals foodstuffs, such as a bag-like body and a bowl-like body, regardless of soft and hard.

  The gas vent valve 1 includes a base film 10 and a cover film 20 as shown in FIGS. 2 (A), (B), (C), and FIG. The base film 10 and the cover film 20 have substantially the same outer shape. The base film 10 and the cover film 20 are made of a resin such as polypropylene, for example. An adhesive layer is provided on the lower surface of the base film 10 so as to be attached to the container Pa.

  The base film 10 is formed with a substantially rectangular air hole Hb at the central portion. And the base film 10 and the cover film 20 are adhere | attached with the adhesive agent etc. on both sides of the ventilation hole Hb. In the present specification, this bonded portion is referred to as a bonding portion Bo in the gas vent valve 1. Moreover, the part pinched | interposed by a pair of adhesion site | part Bo is called non-adhesion site | part Nb.

  In the non-adhesion site Nb, the base film 10 and the cover film 20 are not bonded, and the base film 10 and the cover film 20 are in a normal state, that is, when the pressure in the container Pa is lower than a predetermined pressure. It is in close contact and prevents gas (air) from flowing into the container Pa from the outside.

  On the other hand, when the pressure in the container Pa becomes equal to or higher than a predetermined pressure, the base film 10 and the cover film 20 are separated by the pressure. Therefore, the gas in the container Pa passes through the space formed by separating the base film 10 and the cover film 20 from the vent hole Hb and is discharged to the outside of the container Pa. In the present specification, a space formed by separating the base film 10 and the cover film 20 at the non-adhered portion Nb is referred to as a gas discharge channel.

  Since the vent hole Hb is formed in the base film 10, it has an inner edge. And the inner edge of the base film 10 has a pair of linear inner edge linear part Li orthogonal to the direction of a gas discharge flow path. Moreover, the cover film 20 has a pair of outer edge straight line portions Lo on the outer edge in the non-adhered portion Nb.

  And the inner edge linear part Li of the base film 10 and the outer edge linear part Lo of the cover film 20 are arrange | positioned in parallel. Therefore, in the gas discharge channel, the distance from the end of the vent hole Hb to the end of the gas discharge channel is the same over the entire area. With such a configuration, in the gas vent valve 1, gas is generated from the food in the container Pa, and the gas in the container Pa is efficiently discharged to the outside even if the inside of the container Pa does not rise to a very high pressure. Has realized.

  And, as described in the examples below, in the gas vent valve 1 according to the present embodiment, the vent hole is substantially elliptical, that is, compared with the conventional gas vent valve in which the inner edge of the base film 10 is circular, Since the opening is made at a low pressure, the gas is discharged well from the container Pa, and the gas venting characteristics are excellent.

  In addition, it is preferable that the perpendicular distance (D1, D2 shown to FIG. 2 (A)) of the adjacent inner edge linear part Li and outer edge linear part Lo is 2-5 mm, respectively. Also, the vertical distance between one adjacent inner edge straight line Li and the outer edge straight line Lo (D1 shown in FIG. 2A) and the other vertical distance between the other adjacent inner edge straight line Li and the outer edge straight line Lo (FIG. The sum of D2 shown in 2 (A) (D1 + D2 shown in FIG. 2A) is preferably 4 to 10 mm.

Further, (pressure when spaced a base film 10 and cover film 20 is in the non-adhesion sites Nb) opening pressure of the vent valve 1 is preferably a 72~120mmH ₂ O. The opening pressure increases as the vertical distance between the inner edge straight line portion Li and the outer edge straight line portion Lo increases.

  The opening pressure of the gas vent valve 1, that is, the vertical distance between the inner edge straight line portion Li and the outer edge straight line portion Lo is appropriately adjusted depending on the food filled in the container Pa, the size of the container Pa, and the like.

  As an example, the size of the base film 10 and the cover film 20 is, for example, a rectangle having a piece of 20 to 25 mm, and the size of the vent hole Hb is 7 mm × 10 to 16 mm.

  Moreover, in the non-adhesion site | part Nb, it is preferable to have a film | membrane of viscous fluids, such as a silicone oil, between the base film 10 and the cover film 20. FIG. Adhesiveness between the base film 10 and the cover film 20 is enhanced, air flow from the outside into the container Pa can be more reliably prevented, and the freshness of the food filled in the container Pa can be maintained.

  Moreover, as shown in FIG. 4, it is preferable that the corner of the gas vent valve 1 is a rounded round shape. The degassing valve 1 attached to the container Pa is difficult to peel off.

  Further, the gas vent valve 1 has an inner edge straight portion Li on the base film 10 and an outer edge straight portion Lo on the cover film 20, and the inner edge straight portion Li and the outer edge straight portion Lo are arranged in parallel. The shapes of the base film 10 and the cover film 20 and the shape of the vent hole Hb are not limited.

  For example, as shown in FIG. 5A, the outer edge of the base film 10 and the cover film 20 on the bonding site Bo side and the inner edge of the base film on the bonding site Bo side are curved outwardly. On the contrary, as shown in FIG. 5 (B), the shape may be curved inwardly.

  In addition, as shown in FIG. 6, an auxiliary film 30 may be further disposed on the adhesion site Bo of the cover film 20. In the case where a plurality of containers Pa are stacked and stored, the cover film 20 is pressed against the base film 10 by the weight of the upper container Pa in the gas vent valve 1 attached to the container Pa positioned below. Therefore, even if the internal pressure of the container Pa exceeds a predetermined pressure, it is difficult to form a gas discharge channel. When the auxiliary film 30 is further provided on the cover film 20, the thickness of the auxiliary film 30 makes it easy to form a gas discharge passage even when the container Pa is pressed, and the function of the gas vent valve 1 is exhibited. .

  Various degassing valves were produced and verified for each opening pressure. A gas vent valve having the shape shown in FIG. The outer diameters (X1 × Y1 shown in FIG. 7A) of the base film and the cover film are 20 mm × 20 mm, and the air holes are substantially rectangular. The size of the air holes (X2 × Y2 shown in FIG. 7A) was 10 mm × 7 mm, 12 mm × 7 mm, 13 mm × 7 mm, 14 mm × 7 mm, 15 mm × 7 mm, 16 mm × 7 mm. That is, the vertical distance from the inner vertical line part to the outer edge straight line part (D shown in FIG. 7A) is 5 mm, 4 mm, 3.5 mm, 3 mm, 2.5 mm, and 2 mm, respectively. Silicone oil was applied between the base film and the cover film. These produced gas vent valves are denoted as SA5.0, SA4.0, SA3.5, SA3.0, SA2.5, and SA2.0, respectively.

  Further, as a comparative example, a gas vent valve having the same configuration as described above was manufactured except that the shape of the vent hole was different as shown in FIG. The size of the air holes (X2 × Y2 shown in FIG. 7B) was 13 mm × 7 mm, 14 mm × 7 mm, 15 mm × 7 mm, and 16 mm × 7 mm. Hereinafter, these produced gas vent valves are referred to as SB3.5, SB3.0, SB2.5, and SB2.0, respectively.

  The opening pressure of each produced vent valve was measured. The measurement of the opening pressure was performed as shown in FIG. Specifically, a test instrument was prepared in which a hole was formed in the bottom surface of a cylindrical body having one opened and the other bottomed. The vent holes of the gas vent valve and the holes on the bottom surface of the test device were aligned, and the gas vent valve was attached so as to close the hole on the bottom surface of the test device. Then, the opening of the test instrument is pushed down to the water surface as shown in FIG. 8, and the pressure when the internal pressure of the test instrument rises and the gas vent valve opens is measured with a pressure gauge to measure the opening pressure. did. In addition, it measured 5 times about all and calculated | required the average value of opening pressure. The results are shown in Tables 1 and 2.

  In SA3.5 to SA2.0 and SB3.5 to SB2.0, the vertical distance from the inner edge of the base film to the outer edge of the cover film is the same, but SA3.5 to SA2.0 is SB3.5. It can be seen that each is open at a low pressure with respect to SB2.0. In SA5.0 to SA2.0, the base film has an inner edge straight line portion, the cover film has an outer edge straight line portion, and the inner edge straight line portion and the outer edge straight line portion are parallel to each other. And the degassing characteristics are excellent. Therefore, in SA5.0 to SA2.0, when affixed to a container filled with food that generates gas, even if the internal pressure in the container does not increase so much, the gas in the container is discharged and the container expands. Can be suppressed.

DESCRIPTION OF SYMBOLS 1 Gas vent valve 10 Base film 20 Cover film 30 Auxiliary film 100 Gas vent valve Lo Outer edge linear part Li Inner edge linear part Bo Adhesion part Nb Non-adhesion part Ha Degassing hole Hb Vent hole Pa Container

Claims (6)

A degassing valve comprising a base film having a vent hole and a cover film laminated on the base film, and is attached so as to close the degassing hole of the container, and discharges the gas in the container;
The gas vent valve has a pair of adhesion portions where the base film and the cover film are bonded with the air hole interposed therebetween, and a non-adhesion portion between the pair of adhesion portions,
When the internal pressure of the container is equal to or higher than a predetermined pressure, the base film and the cover film at the non-adhered portion are separated from each other to form a gas discharge channel, and gas is discharged from the container through the vent hole, and the internal pressure When the pressure is below a predetermined pressure, the base film and the cover film of the non-adhered portion are in close contact with each other to prevent gas from flowing into the container,
The base film has only one rectangular or rounded rectangular ventilation hole,
Outer edge of the non-contact deposition site of the cover film has a straight outer straight portion,
It said base wherein said side orthogonal to the gas discharge channel of the non-close adhesion part inner edge of the film has a straight inner linear portion,
The outer edge straight part and the inner edge straight part are parallel,
A vent valve characterized by that. The vertical distance between the outer edge straight line portion and the inner edge straight line portion is 2 to 5 mm.
The gas vent valve according to claim 1. Having a pair of outer edge straight portions across the vent,
Having a pair of inner edge straight portions across the vent hole,
The gas vent valve according to claim 1 or 2, characterized in that The sum of the vertical distance from one adjacent outer edge straight portion to the inner edge straight portion and the vertical distance from the other adjacent outer edge straight portion to the inner edge straight portion is 4 to 10 mm.
The gas vent valve according to claim 3. The predetermined pressure is 72 to 120 mmH ₂ O.
The gas vent valve according to any one of claims 1 to 4, wherein the vent valve is provided. In the non-adhesion site, it has a viscous fluid film between the base film and the cover film,
The degassing valve according to any one of claims 1 to 5, wherein:

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