JP2004033103A - Culture bag for mushroom bed - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To inexpensively provide a tough culture bag for mushroom bed with occurrence of neither pinhole nor breakage at the bottom seal part. <P>SOLUTION: The culture bag for mushroom bed is characterized in that the underside of the bottom seal part 12 is provided with reinforcing parts 15 and 15 formed by thermofusing a specified area including the boundary between a four-plastic film-overlapping portion and a two-plastic film-overlapping portion. <P>COPYRIGHT: (C)2004,JPO

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]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a culture bag for a bacterial bed made of a plastic film having a gusset fold.
[0002]
[Prior art]
In recent years, many artificial mushroom cultivation methods using a culture bag for a bacterial bed made of a plastic film have been practiced. FIG. 5 is a schematic diagram showing the form of a culture bag 10 conventionally used, and FIG. 6 is a schematic diagram showing a state where the culture bag 10 of 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 germ beds has gusset folds 11, 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 to form a bottom seal portion 12 ( (See FIG. 7). The opposite end of the bottom seal portion 12 becomes an opening 16, and a vent 13 is provided in the upper portion of the culture bag, and the vent 13 is covered with a filter 14.
[0003]
In the case of mushroom cultivation, first, a culture medium 17 such as sawdust and rice bran whose moisture is adjusted is packed in a culture bag 10 (see FIG. 6), sterilized by high-pressure steam or the like, and then cultured by inoculation of a mushroom inoculum. .
In the culturing step, the opening 16 of the culture bag 10 is sealed by heat sealing or a jig or the like, but air necessary for the growth of bacteria is supplied by the filter 14 provided in the culture bag 10, so that various bacteria can enter. Is blocked.
[0004]
[Problems to be solved by the invention]
Since the culture bag is disposable, it needs to be inexpensive, and it is desirable that the culture bag be manufactured with a configuration as simple as possible. However, since it has a simple configuration, when a culture bag is filled with several kg of medium, the bottom seal portion 12 may be torn or torn, or a pinhole may occur.
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 fusion substantially parallel to the bottom seal portion 12 to further improve the sealing performance. However, the bottom seal portion 12 may still be torn or pinholed. When pinholes or tears occur in the bottom seal portion 12, germs such as blue mold enter from there and propagate on the bacterial bed. Once the germs have multiplied, the bacterial bed loses its commercial value.
[0005]
Therefore, the present invention has been made in order to solve these problems, and an object of the present invention is to provide a culture bag for a bacterial bed which does not cause pinholes or tears at the bottom seal portion of the culture bag and which is durable. It is to provide at low cost.
[0006]
[Means for Solving the Problems]
The present inventor has investigated a portion where the culture bag is likely to be torn or a pinhole is formed. As shown in FIG. 7, the bottom seal portion 12 where the four plastic films overlap and the two plastic films overlap. It was found that tearing easily occurred at the boundary portions 25, 25 of the portions. That portion is a portion where stress tends to concentrate when the medium is filled.
The present inventor has paid attention to dispersing the stress by forming the reinforcing portions 15 and 15 by performing point-wise heat fusion so as to reinforce the boundary portions 25 and 25 in the bottom seal portion 12. This makes it possible to provide a low-cost, robust culture bag in which the bottom seal portion 12 does not tear or have a pinhole.
[0007]
In addition, a comparative experiment was conducted on the positions of the reinforcing portions 15, 15 to which the heat fusion was performed in a point manner, and an optimum position was found. In other words, the reinforcing portions 15, 15 are formed by heat fusion at a "predetermined area including a 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 preferred that this be done.
[0008]
That is, the present invention is a culture bag for a bacterial 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, A reinforcing portion formed by heat-sealing 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 on the bottom side of the bottom seal portion is provided. It is characterized by the following.
[0009]
Here, the bottom side “below the bottom seal portion” indicates 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 more preferable.
Further, the “predetermined area” indicates that a point is thermally fused.
The shape of the reinforcing portion is preferably rectangular, but more preferably elliptical, so that the force can be dispersed well.
[0010]
It is preferable that an auxiliary bottom seal portion is provided on the bottom side of the bottom seal portion in such a manner that the auxiliary bottom seal portion is heat-fused in parallel with the bottom seal portion.
As shown in FIG. 8, when the culture bag is provided with an auxiliary bottom seal portion 19 on the bottom side of the bottom seal portion 12 by heat fusion substantially parallel to the bottom seal portion 12 in order to enhance the sealing property. There is. Also in this case, the reinforcing portions 15 and 15 are heat-sealed on a predetermined area including 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 12. When formed, it is preferable because neither bag break nor pinholes occur. As a result, a durable culture bag with high sealing properties can be provided.
Further, a vent is provided, and a filter that allows air to pass therethrough and prevents invasion of various germs is attached at a peripheral portion of the vent so as to cover the vent. It can be suitably used for a culture bag that particularly requires properties.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.
As a material for the culture bag, a polyolefin-based material such as polypropylene or high-density polyethylene that is inexpensive and can withstand sterilization by high-pressure steam is preferable. From such a resin material, a plastic film tube is formed by an inflation film forming method. Further, both 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 across the width of the tube to form a bottom seal portion 12.
Then, at the same time as when the bottom seal portion 12 is formed, or at a stage before and after the formation, thermal fusion is performed to form the reinforcing portions 15, 15.
[0012]
As shown in FIG. 1, the reinforcing portions 15, 15 are located on the bottom side S of the bottom seal portion 12, in the vicinity of the bottom seal portion 12, at the portion where four plastic films overlap and at the portion where two plastic films overlap. It is formed by heat fusion into a square shape including a boundary portion. For example, it is made 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 has a length L of 45 cm, a width M of 20 cm, a gusset folding width G of 15 cm, and a straight line. In the case of a culture bag that can be used by filling the medium with 2.5 kg and having a width of 1 mm and a bottom seal portion provided in a shape, as shown in FIG. It is preferable that the horizontal Y is heat-sealed in a square shape of about 1 cm.
By providing the reinforcing portions 15 and 15 in this manner, stress when the culture bag is filled with the culture medium is dispersed, and the bottom seal portion 12 is less likely to be broken.
[0013]
Further, the present invention is not limited to this embodiment.
For example, in the above-described embodiment, the shape of the reinforcing portion is formed in a quadrangle, but is more preferably an ellipse, and is not limited thereto, and may be appropriately selected such as a round shape and a polygonal shape.
In some cases, the auxiliary bottom seal portion 19 is provided as shown in FIG. 8. In this case, as shown in FIG. 2, the reinforcing portions 15 are provided between the bottom seal portion 12 and the auxiliary bottom seal portion 19. Or may protrude from the auxiliary bottom seal portion 19 toward the end of the culture bag on the bottom side as shown in FIG.
Also, the present invention can be applied to a case where the bottom seal portion 12 is heat-sealed not in a straight line shape but in a boat shape.
[0014]
(Comparative experiment)
Next, a culture bag for a bacterial bed according to the present invention was used as Examples 1 and 2, a conventional culture bag was used as Comparative Example 1, and a culture bag having a different reinforcing position from the Example was used as Comparative Example 2. A comparative experiment of the strength was performed and will be described.
Each of the culture bags of Examples 1 and 2 and Comparative Examples 1 and 2 is made of the same gusset-folded bag that can be filled with 2.5 kg of medium, with or without a reinforcing portion, or provided with a reinforcing portion. Differs only in position.
The bag is specifically made of a high-density polyethylene film having a thickness of 20 μm, and the size when the culture bag is folded as shown in FIG. 5 is 45 cm long L, 20 cm wide M, and the width of the gusset fold. G is 15 cm, the width of each of the bottom seal portion 12 and the auxiliary bottom seal portion 19 provided substantially linearly in parallel is 1 mm, and the interval between them is 5 mm.
[0015]
In the first embodiment, as shown in FIG. 2, the reinforcing portions 15, 15 are provided between the bottom seal portion 12 and the auxiliary bottom seal portion 19, in the vicinity of the bottom seal portion 12 and where the four plastic films overlap. The film was heat-sealed in a rectangular shape having a length T of 0.5 cm and a width 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 replaced by a portion where four plastic films overlap and a portion where two plastic films overlap in the auxiliary bottom seal portion 19. Are formed by heat fusion so as to include the boundary portions 27, 27 of the above. At this time, the reinforcing portions 15 are formed so as to project 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 without a reinforcing portion (see FIG. 8).
In Comparative Example 2, as shown in FIG. 9, the reinforcing portions 30, 30 having the same shape and size as those of Examples 1 and 2 were formed by combining a portion where four plastic films overlap in the bottom seal portion 12 and two plastic films. It was formed by heat fusion so as to include the boundary portions 25, 25 of the overlapping portions. At this time, the reinforcing portions 30, 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 bags each of these culture bags were prepared, filled with 1000 cc of water, the opening was sealed by heat sealing, and then dropped from a position of 30 cm in height to check for breakage of the culture bags. Table 1 shows the results.
[0017]
[Table 1]

[0018]
As for the conventional culture bag having no reinforcing portion in Comparative Example 1, tearing was confirmed in 3 bags out of 9 bags.
In Comparative Example 2, the ratio of bag breakage was 9/9, which is easier to break than Comparative Example 1. This is because stress concentrates on the portions of the reinforcing portions 30, 30 that protrude toward the opening 16 side, and the reinforcing portions 30 are apt to be torn.
[0019]
In contrast to these comparative examples, in Example 1, none of the nine bags were found to be broken, and in Example 2, the ratio of the broken bags was 2/9. It can be seen that is difficult to break. Further, comparing Example 1 and Example 2, it can be seen that the effect is closer to the bottom seal portion 12. However, if the reinforcement is arranged on the thin bottom seal part because it is better as it is closer, it is difficult to maintain the arrangement position of the reinforcement with high accuracy with an inexpensive and simplified device, There is a high possibility that it will protrude toward the opening. If it protrudes even a little toward the opening side, it tends to be warped and broken like the result of Comparative Example 2.
Therefore, in order to dispose the reinforcing portion with an inexpensive device, the position of the reinforcing portion is “including 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 from the bottom seal portion. It is preferable that the predetermined area is set.
[0020]
【The invention's effect】
In the culture bag for a microbial bed according to the present invention, the reinforcing portion is provided at an appropriate position, so that a pinhole or a bag break does not occur in the bottom seal portion. Therefore, the hermeticity can be maintained during culturing, and mushrooms can be satisfactorily grown without invasion of various bacteria. Further, since a simple method of providing a reinforcing portion is used, a more robust culture bag for a bacterial bed can be provided at low cost.
[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 a form of a culture bag.
FIG. 6 is a schematic view when a culture bag is filled with a culture 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 diagram showing an arrangement position of a reinforcing portion of Comparative Example 2.
[Explanation of symbols]
Reference Signs List 10 Culture bag for bacterial bed 11 Gusset insertion 12 Bottom seal part 15 Reinforcement part 19 Auxiliary bottom seal part

Claims (5)

Gusset folds are formed at both ends of a tube made of a plastic film, and a culture bag for a bacterial bed comprising a bottom seal formed by heat sealing in the width direction of the tube,
A reinforcing portion formed by heat-sealing 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 on the bottom side of the bottom seal portion is provided. A culture bag for a bacterial bed, comprising: The culture bag for a bacterial bed according to claim 1, wherein the reinforcing portion is rectangular. The culture bag for a bacterial bed according to claim 1, wherein the reinforcing portion is elliptical. The bacterial bed according to claim 1, 2 or 3, wherein an auxiliary bottom seal portion is provided on a bottom side of the bottom seal portion so as to be heat-fused substantially parallel to the bottom seal portion. For culture bags. Vents are provided,
The bacterial bed according to claim 1, 2, 3, or 4, wherein a filter that allows air to pass therethrough and blocks invasion of various bacteria is attached at a peripheral portion of the air hole so as to close the air hole. For culture bags.

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