JP3917023B2 - Bacteria bed culture bag - Google Patents

Description

【００１８】
比較例１の補強部の無い従来の培養袋については、９袋のうち３袋に破れが確認された。
比較例２では破袋の割合が９／９となっており、比較例１よりも逆に破れやすくなっている。これは、補強部３０、３０の開口部１６側に張り出した部分に応力が集中してしまい、反って破れやすくなってしまうからである。
【００１９】
これら比較例に対して実施例１では、９袋のうち破れの確認されたものは無く、また実施例２では破袋の割合が２／９となって、補強部を設けたことで培養袋が破れ難くなっていることがわかる。さらに実施例１と実施例２を比較すると、底シール部１２に近いほど効果があることがわかる。しかし、近いほど良いという理由で、細い底シール部上に補強部を配設しようとすると、安価で簡略化された装置では、補強部の配設位置を高精度に維持することは難しく、どうしても開口部側に張り出してしまう虞が多くなる。開口部側に少しでも張り出してしまうと、比較例２の結果のように反って破れやすくなってしまう。
従って、安価な装置で補強部を配設するには、その位置は、「底シール部より底側の、４枚のプラスチックフィルムが重なり合う部分と２枚のプラスチックフィルムが重なり合う部分の境界部分を含んだ所定面積」であることが好適である。
【００２０】
【発明の効果】
本発明による菌床用培養袋は、補強部を的確な位置に設けたので底シール部においてピンホールや破袋をおこすことがない。そのため、培養の際には密封性が保持でき、雑菌が進入することがなく良好にきのこを栽培することができる。また補強部を設けるという簡単な方法によるので、より丈夫な菌床用培養袋を安価に提供できる。
【図面の簡単な説明】
【図１】本発明による培養袋の底部を示す概略図である。
【図２】本発明による培養袋の他の実施の形態を示す概略図である。
【図３】本発明による培養袋の他の実施の形態を示す概略図である。
【図４】本発明による培養袋の他の実施の形態を示す概略図である。
【図５】培養袋の形態を示す概略図である。
【図６】培養袋に培地を充填した際の概略図である。
【図７】従来の培養袋の底部を示す概略図である。
【図８】従来の培養袋の底部を示す概略図である。
【図９】比較例２の補強部の配設位置を示す概略図である。
【符号の説明】
１０ 菌床用培養袋
１１ ガセット折り込み
１２ 底シール部
１５ 補強部
１９ 補助底シール部[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a culture bag for fungus beds made of a plastic film having gusset folds.
[0002]
[Prior art]
In recent years, many artificial cultivation methods for mushrooms using a culture bag for fungus beds made of plastic film have been carried out. FIG. 5 is a schematic view showing a form of a culture bag 10 conventionally used, and FIG. 6 is a schematic view of the culture bag 10 shown in FIG. 7 and 8 are schematic views showing the bottom of a conventional culture bag.
As shown in FIG. 5, the culture bag 10 for fungus bed has gusset folds 11 and 11 formed at both ends of a tube made of a plastic film, and is heat-sealed in the width direction H of the tube. 7) is provided. The opposite end of the bottom seal portion 12 is an opening 16, and a vent hole 13 is provided in the upper part of the culture bag, and the vent hole 13 is covered with a filter 14.
[0003]
When cultivating mushrooms, culture medium 17 such as sawdust and rice bran adjusted in water is first packed in culture bag 10 (see FIG. 6), sterilized with high-pressure steam, etc., and then inoculated with mushroom seeds and cultured. .
In the culturing process, the opening 16 of the culture bag 10 is sealed by heat fusion or a jig or the like, but air necessary for the growth of the bacteria is supplied by the filter 14 provided in the culture bag 10 so that various bacteria enter. Is blocked.
[0004]
[Problems to be solved by the invention]
Since the culture bag is disposable, it is necessary to be inexpensive, and it is desirable that the culture bag be manufactured with the simplest possible structure. However, due to the simple configuration, when several kg of culture medium is filled in the culture bag, the bottom seal portion 12 may tear or tear or cause pinholes.
Therefore, as shown in FIG. 8, the auxiliary bottom seal portion 19 is formed on the bottom side of the bottom seal portion 12 by heat-sealing substantially in parallel to the bottom seal portion 12 so as to improve the sealing performance. However, the bottom seal portion 12 may still be broken or have pinholes. When pinholes or tears occur in the bottom seal portion 12, bacteria such as blue mold enter from there and propagate in the fungus bed. And once miscellaneous germs propagate, the fungal bed loses commercial value.
[0005]
Therefore, the present invention has been made to solve these problems, and the object of the present invention is to provide a robust culture bed culture bag without causing pinholes or tears in the bottom seal portion of the culture bag. It is to provide at low cost.
[0006]
[Means for Solving the Problems]
The present inventor investigated the portion where the culture bag was easily broken and pinholes were generated, and as shown in FIG. 7, the portion where the four plastic films overlap each other and the two plastic films of the bottom seal portion 12 overlap. It was found that the boundary portions 25 and 25 of the portions are easily broken. That portion is where stress tends to concentrate when the medium is filled.
In view of this, the inventor paid attention to forming the reinforcing portions 15 and 15 by point-by-point heat fusion so as to reinforce the boundary portions 25 and 25 in the bottom seal portion 12 to disperse the stress. Thereby, a strong culture bag in which the bottom seal portion 12 is not torn or pinholes can be provided at low cost.
[0007]
In addition, a comparative experiment was performed on the positions of the reinforcing portions 15 and 15 where heat fusion was performed in a point manner, and an optimum position was found. That is, the reinforcing portions 15 and 15 are provided with an auxiliary bottom seal portion formed by heat-sealing substantially parallel to the bottom seal portion on the bottom side of the bottom seal portion, and between the bottom seal portion and the auxiliary bottom seal portion. , A predetermined area including a boundary portion between a portion where the four plastic films overlap and a portion where the two plastic films overlap in the immediate vicinity of the bottom seal portion, so as not to protrude from the bottom seal portion toward the opening side. It is preferable to be formed by heat fusion.
[0008]
That is, the present invention is a culture bag for a fungus bed in which gusset folds are formed at both ends of a tube made of a plastic film, and a bottom seal portion is formed by heat fusion in the width direction of the tube, On the bottom side of the bottom seal portion, an auxiliary bottom seal portion formed by heat fusion substantially parallel to the bottom seal portion is provided, and the bottom seal between the bottom seal portion and the auxiliary bottom seal portion is provided. A predetermined area including a boundary portion between a portion where four plastic films overlap and a portion where two plastic films overlap is heat- sealed so as not to protrude from the bottom seal portion to the opening side. A formed reinforcing portion is provided.
[0009]
By adopting such a configuration, bag breakage and pinholes do not occur, which is preferable. As a result, it is possible to provide a strong culture bag with high sealing performance.
Here, the bottom side “bottom side from the bottom seal portion” means the side opposite to the opening side (the direction side indicated by the arrow S in FIG. 1), and the closer to the bottom seal portion, the better.
In addition, “predetermined area” indicates that heat fusion is performed in a point manner.
The shape of the reinforcing portion is preferably a quadrangle, but more preferably an ellipse, whereby the force can be dispersed well.
[0010]
In addition, a filter provided with a vent hole that allows air to pass therethrough and prevents invasion of germs is adhered to the peripheral edge of the vent hole so as to close the vent hole, and is sealed except for the filter. Therefore, it can be suitably used for a culture bag that is particularly required for its properties.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings.
The culture bag material is preferably a polyolefin-based material such as polypropylene or high-density polyethylene that is inexpensive and can withstand sterilization by high-pressure steam. A plastic film tube is formed from such a resin material by an inflation film forming method. Further, both side ends of the tube are folded by a gusset bag making machine to form gusset folds 11 and 11, and heat sealing is performed linearly over the width direction of the tube to form the bottom seal portion 12.
Then, at the same time when the bottom seal portion 12 is formed, or before and after that, heat fusion is performed to form the reinforcing portions 15 and 15.
[0012]
As shown in FIG. 1, the reinforcing portions 15, 15 are a portion of the bottom side S of the bottom seal portion 12, in the vicinity of the bottom seal portion 12, a portion where four plastic films overlap and a portion where two plastic films overlap. It is formed by heat-sealing into a quadrangular shape including the boundary portion. For example, it is composed of a high-density polyethylene resin film having a thickness of 20 μm, and the size when the culture bag is folded as shown in FIG. 5 is 45 cm in length L, 20 cm in width M, 15 cm in width G for folding gussets, straight In the case of a culture bag that is 1 mm in width and has a bottom seal part width of 1 mm and can be used by being filled with 2.5 kg of medium, the reinforcing parts 15 and 15 have a vertical T of 0.5 cm, as shown in FIG. It is preferable that the lateral Y is heat-sealed into a quadrangular shape having a length of about 1 cm.
Thus, by providing the reinforcement parts 15 and 15, the stress at the time of a culture bag being filled with a culture medium is disperse | distributed, and it becomes difficult to produce a tear at the bottom seal part 12. FIG.
[0013]
The present invention is not limited to this embodiment.
For example, in the above-described embodiment, the shape of the reinforcing portion is a quadrangle, but is more preferably an ellipse, and is not limited to these, and may be appropriately selected such as a round shape or a polygonal shape.
Further, as shown in FIG. 8, an auxiliary bottom seal portion 19 may be provided. In this case, the reinforcing portions 15 and 15 are provided between the bottom seal portion 12 and the auxiliary bottom seal portion 19 as shown in FIG. 2. Alternatively, it may be provided so as to protrude from the auxiliary bottom seal portion 19 toward the end of the bottom culture bag as shown in FIG.
Further, the present invention can be applied even when the bottom seal portion 12 is heat-sealed in a boat shape instead of a straight shape.
[0014]
(Comparative experiment)
Next, the culture bag for fungus beds according to the present invention is used as Examples 1 and 2, a conventional culture bag is used as Comparative Example 1, and a culture bag having a reinforcing portion disposed differently from the Example as Comparative Example 2 is used. An intensity comparison experiment was performed and will be described.
Each of the culture bags of Examples 1 and 2 and Comparative Examples 1 and 2 is composed of the same bag with a gusset fold that can be filled with 2.5 kg of a medium. Different only in position.
Specifically, the bag is made of a high-density polyethylene film having a thickness of 20 μm, and when the culture bag is folded as shown in FIG. 5, the length L is 45 cm, the width M is 20 cm, and the gusset folding width. G is 15 cm, the width of the bottom seal portion 12 and the auxiliary bottom seal portion 19 provided in a straight line substantially parallel to each other is 1 mm, and the distance between them is 5 mm.
[0015]
In the first embodiment, as shown in FIG. 2, the reinforcing portions 15 and 15 are disposed between the bottom seal portion 12 and the auxiliary bottom seal portion 19 in the immediate vicinity of the bottom seal portion 12 and a portion where two plastic films overlap each other. It was heat-sealed into a quadrangular shape having a vertical T of 0.5 cm and a horizontal Y of 1 cm so as to include a boundary portion where the plastic films overlap.
In the second embodiment, as shown in FIG. 4, the reinforcing portions 15 and 15 having the same shape and size as those of the first embodiment are formed by overlapping the four plastic films and the two plastic films in the auxiliary bottom seal portion 19. These are formed by heat fusion so as to include the boundary portions 27, 27. At this time, the reinforcing portions 15 are formed so as to protrude from the auxiliary bottom seal portion 19 on both the opening side and the bottom side of the culture bag.
[0016]
Comparative Example 1 is a conventional culture bag that is not provided with a reinforcing portion (see FIG. 8).
As shown in FIG. 9, the comparative example 2 includes reinforcing portions 30 and 30 having the same shape and size as those of the first and second embodiments, a portion where the four plastic films overlap in the bottom seal portion 12, and two plastic films. It was formed by heat fusion so as to include boundary portions 25 and 25 of overlapping portions. At this time, the reinforcing portions 30 are formed so as to protrude from the bottom seal portion 12 on both the opening side and the bottom side S of the culture bag.
Nine of these culture bags were prepared, filled with 1000 cc of water, the opening was sealed by heat sealing, and dropped from a position of 30 cm in height to confirm whether the culture bag was torn or not. The results are shown in Table 1.
[0017]
[Table 1]

[0018]
About the conventional culture bag without the reinforcement part of the comparative example 1, tearing was confirmed by 3 bags out of 9 bags.
In Comparative Example 2, the ratio of broken bags is 9/9, which is easier to break than Comparative Example 1. This is because stress concentrates on the portion of the reinforcing portions 30, 30 that protrudes toward the opening 16, and is easily broken.
[0019]
In contrast to these comparative examples, in Example 1, none of the 9 bags were confirmed to be broken, and in Example 2, the ratio of broken bags was 2/9, and a culture bag was provided by providing a reinforcing part. It can be seen that is difficult to tear. Further, comparing Example 1 and Example 2, it can be seen that the closer to the bottom seal portion 12, the more effective. However, it is difficult to maintain the placement position of the reinforcing portion with high accuracy with an inexpensive and simplified device when it is attempted to place the reinforcing portion on the thin bottom seal portion because the closer the better. The risk of overhanging toward the opening increases. If it protrudes to the opening side even a little, it will be easily warped like the result of Comparative Example 2.
Therefore, in order to dispose the reinforcing portion with an inexpensive device, the position includes “the boundary portion between the portion where the four plastic films overlap and the portion where the two plastic films overlap, on the bottom side of the bottom seal portion. It is preferable that it is “a predetermined area”.
[0020]
【The invention's effect】
In the culture bag for fungus bed according to the present invention, since the reinforcing portion is provided at an appropriate position, no pinhole or bag breakage occurs in the bottom seal portion. Therefore, the hermeticity can be maintained at the time of cultivation, and mushrooms can be cultivated satisfactorily without invasion of various bacteria. Moreover, since it is based on the simple method of providing a reinforcement part, the stronger culture bag for a microbial bed can be provided cheaply.
[Brief description of the drawings]
FIG. 1 is a schematic view showing the bottom of a culture bag according to the present invention.
FIG. 2 is a schematic view showing another embodiment of the culture bag according to the present invention.
FIG. 3 is a schematic view showing another embodiment of the culture bag according to the present invention.
FIG. 4 is a schematic view showing another embodiment of the culture bag according to the present invention.
FIG. 5 is a schematic view showing the form of a culture bag.
FIG. 6 is a schematic view when a culture bag is filled with a medium.
FIG. 7 is a schematic view showing the bottom of a conventional culture bag.
FIG. 8 is a schematic view showing the bottom of a conventional culture bag.
FIG. 9 is a schematic view showing the arrangement position of a reinforcing part in Comparative Example 2;
[Explanation of symbols]
10 Bacterial Bed Culture Bag 11 Gusset Fold 12 Bottom Seal 15 Reinforcement 19 Auxiliary Bottom Seal

Claims (4)

A culture bag for a fungus bed in which gusset folds are formed at both ends of a tube made of a plastic film, and a bottom seal portion is formed by heat-sealing in the width direction of the tube,
Provided on the bottom side of the bottom seal portion is an auxiliary bottom seal portion formed by heat fusion substantially parallel to the bottom seal portion,
Wherein between the bottom seal part and the auxiliary bottom seal portion, the bottom most recent of the seal portion, the portion and the bottom a predetermined area including a boundary portion of the two plastic films overlap portions of the plastic film of four overlapping A culture bag for a fungus bed, comprising a reinforcing portion formed by heat-sealing so as not to protrude from the seal portion toward the opening .   The culture bag for a fungus bed according to claim 1, wherein the reinforcing portion is a quadrangle.   The culture bag for a fungus bed according to claim 1, wherein the reinforcing portion is elliptical. Vents are provided,
The culture for microbial bed according to claim 1, 2 or 3, wherein a filter that allows air to pass therethrough and prevents invasion of germs is stuck at the peripheral edge of the vent hole so as to block the vent hole. bag.

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