JP2009106173A - Air venting valve and bag made of plastic and equipped with the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an air venting valve for venting air in a bag, made of plastic, to the outside so that roughage silage can be prepared by using the bag made of plastic. <P>SOLUTION: The air venting valve 5 is provided with: a first hole 6, made in a sidewall sheet 2 of the bag made of the plastic for venting the air in the interior of the bag to the outside; a flexible valve element sheet 7 having the periphery bonded to the outside surface of the sidewall sheet 2, in such a state that the first hole 6 is covered; and a second hole 8 provided in the valve element sheet 7. The second hole 8 is provided at a position so as not to superimpose on the first hole 6, to thereby constitute a valve chest 10 of the sidewall sheet 2 and the valve element sheet 7. Furthermore, the valve element sheet 7 is brought into contact with or is separated from the sidewall sheet 2, according to the pressure difference between the inside and the outside of the bag. When the interior of the bag is kept under overpressure, the valve element sheet 7 is changed into a state of separating from the sidewall sheet 2, to release the air in the interior of the bag to the outside. Meanwhile, when the interior of the bag is kept under a negative pressure. the valve element sheet 7 is brought into contact with the sidewall sheet 2, to close the first hole 6. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a plastic bag for adjusting roughage silage for ruminant livestock such as dairy cows and beef cattle, and more particularly to an air vent valve for venting air inside the plastic bag to the outside.

  Conventionally, building structures such as tower silos and bunker silos have been used to adjust roughage silage for ruminant livestock such as dairy cows and beef cattle (for example, Patent Document 1). A method for producing roughage silage using such a silo is, for example, depositing 5 to 20 tons of chopped roughage in a silo while applying pressure, and then covering with a plastic sheet and placing a heavy stone on the top. It is a method of fermenting in a wet state. And after completion of fermentation, the necessary amount is taken out from the silo and used.

Japanese Patent Laid-Open No. 6-14649

  However, when adjusting forage silage with a silo, when taking out the required amount of silage from the silo, the part that touches the outside air in the silo must be degraded, and the degraded part must be removed at the next removal . Therefore, it is generally said that the silage loss by this method is about 20%, and the amount is large. Therefore, an adjustment method with less loss is desired.

  In addition, forage silage manufacturers may not be dairy farmers. If the silage is transported, adjust the silage in a bag for ease of use, and expose the silage to the open air after the fermentation. It is preferable that it can be transported as it is packed in a bag.

  By the way, silageization of plant-based roughage is to improve the palatability and preservation of ruminant livestock by lactic acid fermentation in airtight containers using lactic acid bacteria that are permanently attached to the roughage. It is. Since lactic acid fermentation is carried out in an obligate anaerobic atmosphere, it is necessary to release and remove the air inside the bag and the organic gas generated in the early stage of fermentation in order to enclose and feed the roughage in the bag. There is.

  Therefore, the present invention has been made for the purpose of solving the above-mentioned conventional problems, and in order to allow adjustment of roughage silage using a plastic bag, in order to vent the air inside the plastic bag to the outside. An air vent valve is provided, and a plastic bag provided with the air vent valve is provided.

  In order to achieve the above object, the present invention adopts as a solution means an air vent valve provided in a plastic bag for adjusting the roughage silage of ruminant livestock, wherein the air inside the bag is placed on the side wall sheet of the plastic bag. Provided with a flexible valve body sheet that is provided with a first hole for pulling out the outside and covering the first hole with the periphery adhered to the outer surface of the side wall sheet. A second hole is provided at a position that does not overlap with the first hole, and the side wall sheet and the valve body sheet constitute a valve chamber, and the valve body sheet corresponds to the pressure difference inside and outside the bag. The air inside the bag is released from the first hole through the valve chamber to the outside through the valve chamber with the valve body sheet being separated from the side wall sheet when the bag is over-pressurized. The That one, the bag inside a negative pressure lies in closing the first hole the valve sheet is in contact with the side wall sheet. With this configuration, the air inside the plastic bag can be vented to the outside via the air vent valve when the bag is overpressured, and the first hole is closed when the bag has a negative pressure to prevent air from entering from the outside. Since it can prevent, the inside of a bag can be maintained in the obligate anaerobic atmosphere suitable for silageization of roughage.

  Further, in the above configuration, the air vent valve is provided at a peripheral portion of the side wall sheet, and the air vent valve is attached to the upper or lower plastic bag in a state where a plurality of the plastic bags containing roughage are stacked vertically. It is preferable that the valve body seat can contact and separate from the side wall seat according to the pressure difference between the inside and outside of the bag. This makes it possible to silage the roughage in each bag in which a plurality of plastic bags are stacked one above the other.

  Moreover, in the plastic bag, by providing the air vent valve, air or organic gas inside the bag can be released to the outside through the air vent valve during lactic acid fermentation in a state where the roughage is stored. It becomes like this. There may be only one air vent valve provided in the plastic bag, but it is more preferable to provide a plurality of air vent valves on the peripheral surface of the bag in order to keep the atmosphere inside the bag in a uniform anaerobic atmosphere. .

  According to the air vent valve of the present invention, the valve body sheet contacts and separates from the side wall sheet according to the pressure difference between the inside and outside of the bag, and the air inside the bag is in the first hole in a state where the valve body sheet is separated from the side wall sheet. From the second hole through the space between the valve body sheet and the side wall sheet, while the first hole is closed while the valve body sheet is in contact with the side wall sheet, the air from the outside of the bag Therefore, the inside of the plastic bag can be maintained in an atmosphere suitable for lactic acid fermentation of the roughage silage, and the roughage silage can be adjusted by the plastic bag. And after fermentation is complete, the silage can be transported as it is packed in a plastic bag without exposing it to the outside air. Therefore, there is an advantage that loss of silage can be reduced without causing silage deterioration.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. 1 and 2 are views showing a plastic bag 1 for adjusting roughage silage, FIG. 1 is a perspective view thereof, and FIG. 2 is a side view of the bag in a state where the roughage is filled and sealed. The plastic bag 1 is made of a flexible synthetic resin sheet such as vinyl, for example, and is configured as a bag-like bag by a pair of front and back side wall sheets 2 and 2, and rough feed is put into the bag from the opening 3, or It can be taken out. The opening 3 of the plastic bag 1 is provided with a rail chuck 4 along the opening edge. By closing the rail chuck 4, the side wall sheets 2 and 2 are brought into close contact with each other to seal the opening 3. It is possible. Such a plastic bag 1 is formed to have a weight of about 15 to 30 kg in a state where forage silage is stored, for example.

  In addition, an air vent valve 5 is provided at the peripheral edge of the side wall sheet 2 of the plastic bag 1 for extracting air inside the bag to the outside. In the example of the figure, a case in which the side wall sheet 2 is provided at two corners on the diagonal line among the four corners is shown. As shown in FIG. 2, the air vent valve 5 is preferably provided on each of the pair of front and back side wall sheets 2 and 2. And it is comprised so that the inside of a bag may be kept in an obligate anaerobic atmosphere by the air vent valve 5 provided in the side wall sheet 2. FIG.

  3A and 3B are diagrams showing the configuration of the air vent valve 5 provided in the plastic bag 1, wherein FIG. 3A is a plan view showing a state of being attached to the side wall sheet 2, and FIG. 3B is an exploded perspective view showing the configuration of the air vent valve 5. FIG. The air vent valve 5 is bonded to the outer surface of the side wall sheet 2 in a state of covering the first hole 6 provided in the side wall sheet 2 of the plastic bag 1 for extracting the air inside the bag to the outside and covering the first hole 6. The substantially rectangular and flexible valve body sheet 7 and the second hole 8 provided in the valve body sheet 7, so that the first hole 6 and the second hole 8 do not overlap each other. As shown in FIG. 3 (a), they are provided at positions separated by a predetermined interval in plan view. Therefore, between the first hole 6 and the second hole 8, a valve chamber 10 (see FIG. 4) configured by the valve body sheet 7 and the side wall sheet 2 is formed. The entire periphery of the valve body sheet 7 is an adhesive portion 9 that adheres to the side wall sheet 2, and air leakage does not occur from around the valve body sheet 7. Further, the valve body sheet 7 and the side wall sheet 2 are not bonded to each other in the portion inside the bonding portion 9 of the valve body sheet 7, and the valve body sheet 7 is configured to be able to contact and separate from the side wall sheet 2. . Such a valve body sheet 7 may be a synthetic resin sheet made of the same material as the side wall sheet 2 of the plastic bag 1. However, the present invention is not limited to this, and the valve body sheet 7 may be made of a material different from that of the side wall sheet 2.

  The first and second holes 6 and 8 in the air vent valve 5 may be formed as slit-shaped holes as shown in FIG. 3, or may be formed as round holes or square holes. As described above, the first hole 6 and the second hole 8 are formed at positions that do not overlap each other, and the contact / separation operation of the valve seat 7 with respect to the side wall sheet 2 is the opening / closing operation of the valve. Yes. That is, the valve seat 7 opens and closes the first hole 6 in accordance with the pressure difference between the inside and outside of the bag, and keeps the inside of the bag in an anaerobic anaerobic atmosphere.

  FIG. 4 is a cross-sectional view showing the open state of the air vent valve 5, and FIG. 5 is a cross-sectional view showing the valve closed state. When the above-mentioned plastic bag 1 is filled with roughage and subjected to lactic acid fermentation, if the bag internal pressure becomes an overpressure state due to air inside the bag or organic gas generated in the initial stage of fermentation, the valve body from the first hole 6 The valve body sheet 7 is pushed up away from the side wall sheet 2 by the pressure of the air flowing between the sheet 7 and the side wall sheet 2, and is opened as shown in FIG. At this time, an air passage is formed by the valve chamber 10 between the valve seat 7 and the side wall seat 2, and the first hole 6 and the second hole 8 communicate with each other. The air or organic gas inside the bag is discharged to the outside of the bag through the first hole 6, the valve chamber 10 and the second hole 8.

  On the other hand, when the bag internal pressure is in a negative pressure state, the valve body sheet 7 is pushed to the atmospheric pressure and is in contact with the side wall sheet 2, and is closed as shown in FIG. At this time, since the first hole 6 is closed by the valve seat 7, it is possible to prevent the outside air from entering the bag. Moreover, since the 2nd hole 8 is also closely_contact | adhered and closed to the side wall sheet 2 at this time, infiltration of external air can be prevented more effectively. In the valve closed state, rainwater, dew, etc. can be prevented from entering the bag.

  Therefore, the inside of the plastic bag 1 can be maintained in an obligate anaerobic atmosphere suitable for lactic acid fermentation of roughage, and a good quality roughage silage can be produced in a state of being stored in the plastic bag 1.

  When there is no pressure difference between the inside and outside of the bag, the valve seat 7 does not necessarily close the first hole 6, but in such a state, air flows to the extent that the lactic acid fermentation inside the bag is adversely affected. There is no particular problem. Rather, it is effective in that components necessary for respiration such as lactic acid bacteria can be supplied by circulating a small amount of air.

  The plastic bag 1 provided with the air vent valve 5 as described above is loaded with a plurality of top and bottom as shown in FIG. 6 in a state where roughage silage is housed. Add And the lactic acid fermentation of roughage is performed in the state of FIG. In this embodiment, since a plurality of air vent valves 5 are provided at the peripheral edge of the side wall sheet 2 of the plastic bag 1, as shown in FIG. 6, a plurality of plastic bags 1 containing roughage are stacked up and down. Even if it exists, each air vent valve 5 is provided in the position which the valve body sheet | seat 7 cannot contact with / separate with respect to the side wall sheet | seat 2 according to the pressure difference inside and outside a bag, without contacting the upper or lower plastic bag 1. . Therefore, the inside of each loaded plastic bag 1 can be maintained in an obligate anaerobic atmosphere, and lactic acid fermentation can be performed satisfactorily. And after completion | finish of fermentation, since it does not produce deterioration etc. by transporting each plastic bag 1 as it is, utilization of roughage silage with few losses is possible.

  Furthermore, since the air vent valve 5 described above has a relatively simple configuration, the plastic bag 1 suitable for roughage silage can be provided at low cost. For example, tree branches and leaves contained in industrial wastes may be used as raw material for roughage silage, and some hard materials and needles may be included, and some may be powdered. is there. Therefore, when an air shutoff valve having a complicated structure is used as the air vent valve of the plastic bag 1, the cost required for maintenance and bag replacement when the valve is damaged or clogged by needles or the like increases. On the other hand, in the case of the present embodiment, the plastic bag 1 itself provided with the air vent valve 5 can be provided at low cost, so that the cost required for maintenance and replacement of the bag is low and extremely convenient. Since the air vent valve 5 described above can be reused repeatedly as long as there is no damage such as breakage, further cost reduction can be expected.

  As mentioned above, although one Embodiment of this invention was explained in full detail, this invention is not limited to the content mentioned above. For example, in the above embodiment, the case where the air vent valve 5 is provided at two corners on the diagonal line among the four corners of the side wall sheet 2 is illustrated, but the present invention is not limited to this, and air is vented at all four corners. The valve 5 may be provided, or a plurality of air vent valves 5 may be continuously arranged along the peripheral edge of the side wall sheet 2.

  Moreover, although the case where it was substantially rectangular shape in the example of a figure of the valve body sheet | seat 7 was illustrated, it is not restricted to this. That is, the valve body sheet 7 may be configured to be able to contact the side wall sheet 2 and close the first hole 6 when the valve is closed. It is also possible to adopt other shapes.

  Further, a plurality of first holes 6 may be provided for one air vent valve 5 or a plurality of second holes 8 may be provided.

It is a perspective view of the plastic bag for adjusting roughage silage. It is a side view of the state which filled and sealed the forage in the plastic bag for adjusting forage silage. It is a figure which shows the structure of the air vent valve provided in a plastic bag, (a) is a top view which shows the state attached to the side wall sheet, (b) is the disassembled perspective view which shows the structure of an air vent valve. It is sectional drawing which shows the valve opening state of an air vent valve. It is sectional drawing which shows the valve closing state of an air vent valve. It is a figure showing the state where a plurality of plastic bags were stacked up and down.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Plastic bag 2 Side wall sheet 5 Air vent valve 6 1st hole 7 Valve body sheet | seat 8 2nd hole 9 Bonding part 10 Valve chamber

Claims (4)

An air vent valve provided in a plastic bag for adjusting the roughage silage of ruminant livestock,
A flexible valve in which a side hole of a plastic bag is provided with a first hole for extracting air inside the bag to the outside, and the periphery is adhered to the outer surface of the side wall sheet in a state of covering the first hole A body sheet, the valve body sheet is provided with a second hole at a position not overlapping with the first hole, and the side wall sheet and the valve body sheet constitute a valve chamber,
According to the pressure difference between the inside and outside of the bag, the valve body sheet comes into contact with and separates from the side wall sheet. From the second hole through the valve chamber to the outside, and when the negative pressure inside the bag, the valve seat contacts the side wall sheet to close the first hole. Air vent valve.   The air vent valve is provided at a peripheral portion of the side wall sheet, and the air vent valve does not hit the upper or lower plastic bag in a state in which a plurality of plastic bags containing roughage are stacked up and down. 2. The air vent valve according to claim 1, wherein the valve body sheet can be brought into contact with and separated from the side wall sheet in accordance with a pressure difference.   A plastic bag comprising the air vent valve according to claim 1 or 2, wherein air or organic gas inside the bag is released to the outside through the air vent valve during lactic acid fermentation in a state where roughage is stored. A plastic bag characterized by   The plastic bag according to claim 3, comprising a plurality of the air vent valves.

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