JP7076621B1 - Mushroom cultivation bag - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a mushroom cultivation bag capable of preventing invasion of a medium or the like into air pockets temporarily formed at four corners of a flat bottom surface in the process of charging a medium into the bag. SOLUTION: In a bag body 11 with a horizontal gusset made of a plastic film, the left and right folded films 11c and 11d are divided into a front side folded film half piece and a back side folded film half piece, respectively, with a crease line 12 as a boundary, and a lower end thereof. The bottom opening sealing heat seal wire portion 14 and the crease line 12 intersect each other, and the intersection is thermally coupled O. Starting from this coupling point, a part near the bottom of the front film and the front side folded half piece A part of the film and the back film near the bottom and the space between the back side folded half film are directed toward both side edges of the front and back films, and the pocket opening closing heat sealing wire at a predetermined angle θ with respect to the bottom opening sealing heat sealing wire portion 14, respectively. The portions 15c1, 15c2 and 15d1 and 15d2 are heat-welded. [Selection diagram] Fig. 1

Description

The present invention relates to a mushroom cultivation bag, and more specifically, a mushroom cultivation bag made of a bag with a horizontal gusset made of a plastic film, and the bagging medium block in which a predetermined amount of medium is filled in the cultivation bag is not filled with medium. The present invention relates to a mushroom cultivation bag suitable for a bag folding machine that folds a part.

In recent years, the cultivation of mushrooms such as shiitake mushrooms has become the mainstream of air-conditioned fungal bed cultivation using a medium made from bag powder instead of log cultivation, and most of the containers used for this fungal bed cultivation are. Cultivation bags made of plastic film with folds (also called "gussets" or "gussets", hereinafter referred to as "horizontal gussets") on both sides are used.

The applicant uses this type, that is, a cultivation bag with a horizontal gusset made of a plastic film, and fills the cultivation bag with a predetermined amount of medium to form a bagged medium block, and the unfilled portion of the bagged medium block. We developed a manufacturing method and equipment for a bagged medium block that automates a series of operations to fold the bag, carry the folded bagged medium block into a container, and transport it to the next mushroom cultivation process, and applied for a patent for the result. , Has already obtained a patent, and on the other hand, has also filed a divisional application for a bag folding machine constituting the bagging medium block manufacturing apparatus, which has already been published (Patent Document 1 below).

This bagging medium block manufacturing device picks up a plurality of cultivation bags that are folded into a sheet and stacked one by one, opens the bag mouth, and puts a predetermined amount of medium to form a cubic block. It consists of a bagging medium block forming machine, a bag folding machine that folds the unfilled part of this bagging medium block, and a container loading machine that carries the folded bagged medium blocks into a container in a predetermined order. There is.

In this device, the bag folding machine includes a conveyor for transporting the bagging medium block formed by the block forming machine from upstream to downstream, and a bag mouth shaping means provided on the upstream side on this conveyor. The bagged medium block, which is provided with a folding means attached to this and is transported from the upstream bridging part of the conveyor, is folded after the bag mouth shaping means is used to shape the vicinity of the bag mouth of the unfilled portion of the cultivation bag. The bag mouth of the unfilled portion of the cultivation bag is neatly and compactly folded and transported downstream, transported to the container loading machine in the next process, and further transported to the next mushroom cultivation process.

According to this folding means, that is, a bag folding machine, the folding work of the unfilled part of the bagging medium block, which could only be done manually until now, can be automatically mechanized, so that the work efficiency is improved and the labor cost is reduced. It has become popular among mushroom producers and has begun to spread widely.

Japanese Unexamined Patent Publication No. 2021-78510 Utility Model Registration No. 3205672

However, although this folding machine is an extremely rare case, the bag mouth of the bagging medium block does not open in a shape suitable for the folding machine, and the bag mouth is pushed by the member constituting the folding mechanism. Trouble such as crushing, damage or breakage occurred. After investigating the cause, it was found that it was in the cultivation bag used for forming the bagging medium block, that is, the bag body with a horizontal gusset made of plastic film.

That is, in the block forming machine, this bag with a horizontal gusset forms a rectangular flat surface at the bottom when a predetermined amount of medium is added, and in the process of forming this flat surface, the four corners are formed. The medium may be unevenly distributed, and this uneven distribution causes a height difference on the flat surface of the bottom, and this height difference causes the bagged medium block to tilt at an irregular angle without standing vertically from the floor surface, and the bag mouth. Was not opened in a shape suitable for the folding machine, which caused the members of the folding mechanism to not be inserted correctly.

More specifically, when a predetermined amount of medium is put into the cultivation bag, the medium hits the bottom of the bag with horizontal gusset, and the bottom of the bag with horizontal gusset is a linear bottom opening sealing heat seal wire portion. A part of the front and back films is pushed back and forth by the medium, while the side films (folding films) forming the left and right horizontal gussets are pushed outward to form a flat surface at the bottom. At that time, since the horizontal gusset part of the bottom is also connected by the bottom opening sealing heat seal wire part, the side films forming the left and right horizontal gussets pop out outward, and in the process, the four corners of the rectangular bottom surface. In addition, when looking at the bottom from the bag mouth, a small room or pocket (hereinafter referred to as an air pocket, which is called an air pocket) that is temporarily filled with air in a substantially triangular shape with one side open and swells. When the filling of the medium is completed and the flat surface is formed on the bottom of the pocket, the air inside is extruded and crushed by the medium), and the medium or the like may enter the air pocket. As a result, those air pockets cause a difference in height from the side view between the air pocket containing the medium and the air pocket not containing the medium (the same applies to the amount of the medium entering). rice field. It has also been found that if a medium or the like invades these air pockets, it may adversely affect the bacterial bed culture in the culture step.

In addition, such tilting of the bagged medium block may occur due to other conditions. For example, the thickness of the film that forms the bag with horizontal gusset is related, and if it is thin, the unfilled part will bend forward when the medium is filled and erected, and the upper bag mouth will not face straight up. There is. In addition, the same thing happens when the unfilled portion of the medium is taller than the filled portion, and the upper bag mouth is tilted in relation to the size and mounting position of the filter attached to the unfilled portion. Sometimes.

On the other hand, this kind of plastic film bag with a horizontal gusset has a potential problem of water leakage. It is sealed with a heat seal to seal the opening at the lower end of the bag and form the bottom, but at this time, the bottom is the heat of the facing front and back films or the heat obtained by adding both side folding films. At the sealing location, the film layer is 2 to 4 layers. Due to the difference in the number of layers, the degree of welding of the heat-sealed portion is different, and the part where the number of film layers changes is peeled off or damaged due to the impact at the time of filling the medium and the weight of the medium, resulting in pinholes. It has the problem of occurring and leaking water. The applicant has developed a cultivation bag in which the heat-welded portion in the portion where the number of film layers changes during separate use does not leak even if it is pulled from the surroundings (Patent Document 2 above). ..

Therefore, the present invention is intended to solve a potential problem in a cultivation bag with a horizontal gusset made of a plastic film through troubles in a developed bag folding machine, and an object thereof is as follows.

An object of the present invention is a cultivation bag made of a bag body with a horizontal gusset made of a plastic film, and in a process in which a predetermined amount of medium is charged to form a bagged medium block, the bottom is temporarily set at four corners of a flat surface. A flat surface is formed at the bottom, which prevents the medium from entering the air pocket formed in the bag, and the bagged medium block is erected substantially vertically from the horizontal floor surface above. The purpose is to provide a mushroom cultivation bag in which the bag mouth is opened directly upward.

Further, another object of the present invention has the above-mentioned object, and also suppresses the formation of holes due to breakage or the like because the bottom heat seal wire portion of the bag body with a horizontal gusset is peeled off even when it receives a strong traction force from the surroundings. The purpose is to provide a mushroom cultivation bag that is prevented from leaking.

The above object of the present invention can be achieved by the following configuration.
That is, in the mushroom cultivation bag of the first aspect of the present invention, the front and back films having a predetermined horizontal width and a vertically long rectangular shape and the vertically long edges of the front and back films are integrally connected to each other with a crease line in the central portion. A flat tube made of a folded film facing each other is cut to a predetermined length to form a bag opening to be expanded at the upper end, and the folded film is folded at the lower end to seal a linear bottom opening. It consists of a bag with a horizontal gusset made of plastic film that is heat-welded and sealed at the wire.
The inside of the bag is filled with a medium from the bottom formed by filling a predetermined amount of medium to _a predetermined height h1 and unfilled with a height _h2 from the filling part to the bag mouth. It is divided into parts, and a vent hole of a predetermined size is formed in at least one of the front and back films of the unfilled portion, and a filter is attached to the vent hole.
The thickness t of the film is 0.05 mm ≧ t ≧ 0.075 mm, the height h ₁ is in the range of 120 mm to 180 mm, and the ratio of the height h ₁ to the height h ₂ is 3: 7 to. 4.6: 5.4,
The left and right facing fold films are divided into a front side fold film half piece and a back side fold film half piece, respectively, with the crease line as a boundary, and the lower end portion is the bottom opening sealing heat seal wire portion and the crease line. Are crossed and this intersection is thermally coupled, and from the bonding point O as a starting point, a part near the bottom of the front film and the front side folded half film and a part near the bottom of the back film and the back side fold. The half-piece films are heat-welded toward both sides of the front and back films at the pocket opening heat-sealing wire portion forming an angle θ in the range of 45 ° ± 1 ° with respect to the bottom opening sealing heat-sealing wire portion. It is characterized by being.

The mushroom cultivation bag of the second aspect of the present invention is the mushroom cultivation bag of the first aspect, and the bag body with a horizontal gusset is made of a plastic film having a blow ratio in the range of 2.5 to 3.45 by the inflation method. The bottom opening sealing heat seal wire portion is connected to the side seal portion extending inward by a predetermined length from one side end of the bag body with a horizontal gusset and bent toward the lower bottom portion side. A bent seal portion having an inclined side, an intermediate seal portion having a predetermined length connected to the bent seal portion, a bent seal portion connected to the intermediate seal portion, and the other end side connected to the bent seal portion. The inclined side of each bent seal portion is formed by a side seal portion extending to, and is inclined at a predetermined angle θ with respect to the lower bottom side, and the coupling point O is provided on each of the inclined sides. , The pocket mouth closing heat seal wire portion extends from the coupling point O.

The mushroom cultivation bag according to the third aspect of the present invention is the mushroom cultivation bag according to the first or second aspect. It is characterized by being extended.

According to the mushroom cultivation bag of the first aspect of the present invention, air pockets temporarily formed at the four corners of the flat bottom surface in the process of charging a predetermined amount of medium into a bag with a horizontal gusset made of a plastic film. It is possible to provide a cultivation bag that stands upright with the bag mouth above the horizontal floor surface accurately opened and prevents the front sagging of the cultivation bag by preventing the invasion of the medium and the like into the bottom and forming a flat bottom surface at the bottom. It will be like .

Further, in the mushroom cultivation bag of the second aspect of the present invention, the bag body with a horizontal gusset is made of a film having a blow ratio in the range of 2.5 to 3.45, and a bent seal portion is formed on the bottom opening sealing heat seal wire portion. , And an intersection O is provided on the inclined side of this bent seal portion, and from this point as a starting point, a part near the bottom of the front film and a part near the bottom of the front side fold film and a part near the bottom of the back film and the back side fold. Since the half-piece film is heat-welded to both sides of the front and back films at the pocket opening heat-sealing wire part at a predetermined angle to the bottom opening sealing heat-sealing wire part, it is inside the bag with a horizontal gusset. Even if a large amount of medium is contained, water does not leak even if the film heat-welded portion in the portion where the number of film layers changes is pulled from the surroundings. In addition, in the process of charging a predetermined amount of medium, the medium and the like are prevented from entering the air pockets temporarily formed at the four corners of the flat bottom surface, and the flat bottom surface is formed at the bottom, so that the bottom surface is horizontal. It is possible to provide a cultivation bag that stands upright with the bag mouth above the floor opened accurately.

In the mushroom cultivation bag according to the third aspect of the present invention, the pocket mouth closing heat seal wire portion is extended starting from a portion away from the bonding point O, so that the pocket mouth closing heat seal wire portion is laminated with a film. It is possible to avoid forming in a large number of multiple heat welded portions, eliminate peeling, breakage, damage, etc. from the coupling point O, and prevent water leakage.

The mushroom cultivation bag according to the first embodiment of the present invention is shown, FIG. 1A is a front side perspective view, and FIG. 1B is a perspective view of a bagged medium block in which a medium is packed in the cultivation bag of FIG. 1A. 2A is a bottom-back view of FIG. 1B, and FIG. 2B is a bottom plan view of FIG. 1B. FIG. 3 is an enlarged view of the right folded portion of FIG. 1A. FIG. 4 shows a mushroom cultivation bag according to the second embodiment of the present invention, FIG. 4A is a front perspective view, and FIG. 4B is an enlarged view of an IVB portion of FIG. 4A.

Hereinafter, the mushroom cultivation bag according to the embodiment of the present invention will be described with reference to the drawings. However, the embodiments shown below exemplify a mushroom cultivation bag for embodying the technical idea of the present invention, and are not intended to specify the present invention. It is equally applicable to those of other embodiments contained in.

[Embodiment 1]
The mushroom cultivation bag according to the first embodiment of the present invention will be described with reference to FIGS. 1 to 3. 1A shows a mushroom cultivation bag according to the first embodiment of the present invention, FIG. 1A is a front perspective view, FIG. 1B is a perspective view of a bagged medium block in which a culture medium is packed in the cultivation bag of FIG. 1A, and FIG. 2A. 1B is a bottom-back view, FIG. 2B is a bottom plan view (medium omitted) of FIG. 1B, and FIG. 3 is an enlarged view of a right folded portion of FIG. 1A.

The mushroom cultivation bag 10 of the first embodiment is formed in a substantially central portion between a pair of rectangular facing front films 11a and back films 11b having a predetermined width and length, and the vertically long edges of the front films 11a and back films 11b. From the bag body 11 with a horizontal gusset made of plastic film formed into a tube shape that is flatly folded with a pair of folding films 11c and 11d that are integrally connected so that the crease line 12 can be inserted and are arranged so as to face each other on the left and right sides. Become. This plastic film is preferably a polyethylene film.

In the bag body 11 with a horizontal gusset, a bag opening 11f to be expanded is formed at the upper end, and the opening at the lower end is a linear bottom opening sealing heat seal wire portion 14 by folding the folding films 11c and 11d. It is integrally heat-welded and sealed. The seal wire width of the bottom opening sealing heat seal wire portion 14 is, for example, 1.5 to 2.5 mm, and is simply shown by a line in FIG.

The bag 11 with a horizontal gusset has a filling portion for filling the medium 16 from the bottom (see FIG. _1B showing a state of being filled with the medium) to a predetermined height h1 and a filling portion from the filling portion to the bag mouth 11f. It is _divided into an unfilled portion having a height h2, and a through hole 11a1 having a predetermined size is formed in at least one of the front and back films of the unfilled portion, and the filter 13 is attached to the through hole 11a1. .. The height h ₁ is the height from the bottom of the medium-filled state, and this bottom is formed by the bottom ends of the front film 11a and the back film 11b extending back and forth as shown in FIG. 2B. Will be done. The front-back spread is about half the width of the left-right folded films 11c and 11d. When the filter 13 is attached to both the front film 11a and the back film 11b, the filters 13 are attached so as to be offset from each other so that the filters 13 between the adjacent bags with horizontal gussets 11 do not overlap.

The left and right facing fold films 11c and 11d are equally divided into front side fold film halves 11c1 and 11d1 and back side fold film halves 11c2 and 11d2, respectively, with the crease line 12 as a boundary. That is, the left folded film 11c is divided into a front half film half piece 11c1 and a back side film half piece 11c2 with the crease line 12 as a boundary, and the right folded film 11d is also divided into a front half film half piece 11d1 and a back side with the crease line 12 as a boundary. It is divided into two pieces of film, 11d2.

Further, at the lower end portions of the left and right facing folded films 11c and 11d, the intersections of the bottom opening sealing heat seal wire portion 14 and the crease line 12 are thermally coupled to form a coupling point O, respectively. Then, starting from this bonding point O, a part near the bottom of the front film 11a and a part near the bottom of the front side folded film half piece 11c1 and a part near the bottom side of the back film 11b and a part between the back side folded half piece film 11c2 are between the front film 11a and the back film. Folded seal portions 15c1 and 15c2 (behind reference numeral 15c1) on the front and back sides so as to form a predetermined angle θ (see FIG. 1A) with respect to the bottom opening sealing heat seal wire portion 14 toward both side edges of 11b, respectively. It has a heat-sealed configuration to form (hidden).

The front and back folded seal portions 15c1 and 15c1 are heat-welded by abutting the heat seal bar on the front and back film surfaces with a separating plate interposed therebetween. Further, the folding seal portions 15d1 and 15d2 on the front and back sides of the right side, which will be described later, are also heat-sealed by the same method.

Similarly, a part near the bottom of the front film 11a, a part near the bottom of the front side folded half film 11d1 and the back film 11b, and a part between the back side folded half film 11d2 are also directed toward both side edges of the front film 11a and the back film 11b. It has a configuration in which the front and back folding seal portions 15d1 and 15d2 are heat-sealed so as to form a predetermined angle θ (see FIG. 1A) with respect to the bottom opening sealing heat-sealing wire portion 14, respectively.

That is, the lower ends of the left and right folded films 11c and 11d are in a folded state, that is, the front side film half piece 11c1, the back side film half piece 11c2, and the back side film half piece 11d2 of the front side half film piece 11d1 border the crease line 12. It is folded into a state, laminated along the bottom opening sealing heat seal wire portion 14, and heat-bonded together. As _a result, the openings of the air pockets P1 to _P4 are closed. That is, these fold-in seal portions 15c1, _15c2 and 15d1 and 15d2 are closed portions of the air pockets P1 to P4 ₍ see FIG. 2B). The angle θ will be described later, but it is preferably 45 °.

Hereinafter, the air pockets P1 to P4 will be described with reference to FIGS. _1A , 2 and ₃ . Assuming that the folding depths of the left and right folded films 11c and 11d are (a) (see FIG. 2B, the same applies hereinafter) and the length of the folded film half piece, for example, the front side folded half piece 11b is (b), it corresponds to (a). The intersection of the side and the side corresponding to (b) is a right angle. Further, assuming that the opposite side of this right-angled intersection (corresponding to the pocket opening closing heat seal wire portion 15d1) is (c), a right-angled triangle is formed in the bottom view, and a space having a predetermined size similar to that inside the triangular cap is created inside. A dent or a small room (hereinafter referred to as an air pocket) having a predetermined depth is formed. Since all the corners of this right triangle are heat-welded for the time being, air is substantially not present inside the air pocket at the time of manufacturing the bag body 11 with a horizontal gusset. However, since the corner portion (d) formed by the side corresponding to (b) and the side corresponding to (c) is formed by the point-shaped heat welding portion, it is predetermined inside the bag body 11 with a horizontal gusset. The heat-welded portion of the corner portion (d) may be peeled off due to the pressure applied in the process of forming the bagged medium block 17 (FIG. 1B), and the air pocket may be filled with air. The portions corresponding to the corners (d) exist at the _four corners of the flat bottom surface, and the symbols P1 to _P4 in FIG. 2B indicate these air pockets.

Since the lower end portion of the bag body 11 with a horizontal gusset is connected by the linear bottom opening sealing heat seal wire portion 14, a flat surface is not formed in advance at the lower end portion of the bag body 11 with a horizontal gusset. In the process of charging a predetermined medium into the bag body 11 with a horizontal gusset and forming the bagged medium block 17 (FIG. _1B ), the spaces of the air pockets P1 to _P4 are temporarily filled with air. And may swell. However, when the injection of the medium is completed, that is, when the flat _bottom surface is formed, the air filled in the air pockets _P1 to _P4 is crushed by the medium, so that the air pockets P1 to _P4 are crushed. Air is released and it becomes flat.

That is, when a predetermined amount of the medium 16 is put into the cultivation bag into the bag body 11 with a horizontal gusset, the medium first hits the bottom of the bag body 11 with a horizontal gusset, and the bottom of the bag body 11 has a linear bottom. A part of the front film 11a and the back film 11b is pushed back and forth by the medium with the mouth sealing heat seal wire portion 14 as a boundary. On the other hand, the left and right folded films 11c and 11d are extruded outward to form a flat flat surface at the bottom of the bottom. At this time, since the lower ends of the folded films 11c and 11d are coupled to the bottom opening sealing heat seal wire portion 14 in the folded state, small air pockets having a substantially triangular shape are formed at the four corners of the rectangular bottom flat surface. P ₁ to P ₄ are formed.

However, since the portions corresponding to the sides (a), (b), (c) and the corners ( _d ) of the air pockets P1 to P4 are all heat _- welded and sealed, they are usually sealed. Does not _allow air to enter the inside of air pockets P1 to _P4 . However, in the process in which the predetermined medium is put into the bag body 11 with a horizontal gusset and the bagged medium block 17 (FIG. 1B) is formed, the heat-welded portion corresponding to the corner portion (d) is peeled off and inside. Even if air may enter, the size of the peeled portion is very small, so that the medium or the like is prevented from entering the inside of the air _pockets P1 to _P4 . As a result, the bottom of the prepared bagged medium block 17 becomes a flat surface, and there is no difference in height.

By the way, at the heat coupling portion O, the bottom opening sealing heat seal wire portion 14 and the front or back pocket opening closing heat seal wire portions 15c1, 15c2 and 15d1, 15d2 intersect with each other, and further, the front and back films 11a and 11b. It also intersects the left and right folding films 11c and 11d. Therefore, not only four layers are laminated on one side and two layers are laminated on the other side with the heat coupling portion O as a boundary, but also the pocket opening closing heat seal wire portions 15c1, 15c2 and 15d1 and 15d2 are concentrated. Therefore, the heat-bonded portion O becomes fragile, and there is a risk of peeling, breakage, damage, etc. at this portion.

Therefore, in the bag body 11 with a horizontal gusset according to the first embodiment, a portion (hereinafter referred to as “starting point”) at which the pocket opening closing heat sealing wire portions 15c1, 15c2 and 15d1 and 15d2 are connected to the bottom opening sealing heat sealing wire portion 14 is provided. A place slightly separated from the place where the front and back films 11a and 11b, the left and right folded films 11c and 11d, and the bottom opening sealing heat seal wire portion 14 intersect, that is, a place separated by several millimeters (for example, 2 to 3 mm). By doing so, it is possible to form four layers on both sides of the starting point, so that the above-mentioned concerns such as peeling, destruction, and damage at the time of adding the medium can be eliminated. When the starting point is moved or the like, the starting point, the front and back films 11a and 11b, the left and right folded films 11c and 11d, and the bottom opening sealing heat seal wire portion 14 are displaced from each other, and one side has four layers at this portion. Although the other side is a stack of two layers, since the pocket mouth closing heat seal wire portions 15c1, 15c2 and 15d1 and 15d2 are not concentrated, there is less concern about peeling, breakage, damage, etc. when pouring the medium. Moreover, water leakage during mushroom cultivation can be reduced.

According to the cultivation bag made of the bag body 11 with a horizontal gusset described above, when a predetermined medium is put into the bag body 11 with a horizontal gusset, a flat surface having a predetermined size is formed at the bottom and an air pocket is formed. _The medium does not invade P1 to _P4 , and there is no difference in height at the bottom.

It should be noted that, only by forming such a flat surface, the unfilled portion on the medium-filled portion of the bag body 11 with a horizontal gusset may not stand upright and may tilt forward. The inclination is related to, for example, the type and thickness t of the plastic film forming the bag body 11 with a horizontal gusset, and if the thickness is thin, it bends forward, so it is necessary to set it within a predetermined range. In addition, the balance between the height h ₁ of the medium-filled portion and the height h ₂ of the unfilled portion is also important, and it tilts as if this balance is not balanced, and it depends on the size of the filter 13 or its mounting position. May also tilt. The filter is installed at a height at which the surface of the medium does not excessively dry, and at different positions where the front and back surfaces do not overlap.

Hereinafter, preferred ranges of thickness t, height h ₁ and h ₂ are shown. These numerical ranges are empirically derived based on the results actually used by the applicant.
The thickness t is preferably 0.05 mm ≧ t ≧ 0.075 mm. In this range, if t is less than 0.05 mm , front sagging is likely to occur. Even if t exceeds 0.075 mm, the effect does not change and the price of the mushroom cultivation bag becomes high, which is uneconomical.

The height h ₁ is in the range of 120 mm to 180 mm, and the ratio of h ₁ to h ₂ is preferably 3: 7 to 4.6: 5.4. If it is out of this range, maedare is likely to occur.

Further, the inclination angle θ is preferably θ = 45 ° ± 1 °. According to the inclination angle in this range, beautiful isosceles triangle-shaped air pockets are formed at the four corners of the flat bottom surface, and the bottom surface of the flat bagged medium block can be easily obtained.

As described above, according to the cultivation bag 10 of the first embodiment, a predetermined amount of medium is charged into the bag body 11 with a horizontal gusset made of a plastic film to form a bagged medium block at the bottom. When the flat surface is formed, the invasion of the medium etc. into the air pockets temporarily formed at the four corners of the flat surface is prevented, and the flat surface having no height difference is formed at the bottom, and the flat surface is formed from the horizontal floor surface. The bagged medium block stands upright approximately vertically, allowing it to provide a cultivation bag with the upper bag mouth accurately opened.

[Embodiment 2]
The mushroom cultivation bag according to the second embodiment of the present invention will be described with reference to FIG. 4A shows a mushroom cultivation bag according to the second embodiment of the present invention, FIG. 4A is a front perspective view, and FIG. 4B is an enlarged view of an IVB portion of FIG. 4A. Further, in the following description, the same reference numerals will be given to the parts common to the first embodiment, and the explanations thereof will be quoted, and different configurations will be described in detail.

In the mushroom cultivation bag 10A according to the second embodiment of the present invention, the heat welding seal portion in the cultivation bag described in Patent Document 2 is used instead of the bottom opening sealing heat seal wire portion 14 of the mushroom cultivation bag 10 of the first embodiment. It is provided so that the film heat-welded portion in the portion where the number of film layers changes during use does not leak even if it is pulled from the surroundings.

That is, the mushroom cultivation bag 10A is made of a bag body 11A with a horizontal gusset, and the bag body 11A with a horizontal gusset is made of a plastic film having a blow ratio of 2.5 to 3.45 in the inflation method. There is. Then, instead of the linear bottom opening sealing heat seal wire portion 14 of the mushroom cultivation bag 10 of the first embodiment, the bottom opening sealing heat provided with a bent seal portion at a predetermined angle in the middle of the heat sealing wire portion. Using the seal wire portion 14A (corresponding to the heat-welded seal portion of the cultivation bag described in Patent Document 2 above), the pocket mouth closing heat seal wire portions 15c1, 15c2 and 15d1 and 15d2 are attached to the bottom opening sealing heat seal wire portion 14A. Each is thermally coupled.

As the plastic film produced by the inflation method, the tensile strength differs between the vertical direction and the horizontal direction depending on the blow ratio and the tensile speed in the inflation film manufacturing apparatus. By providing a portion O where the bottom opening sealing heat seal wire portion 14A and the crease line portion of the folded film intersect within a predetermined angle range between the lateral direction, the heat welding at the intersection becomes firm and the manufacturing process The product defect rate in Japan has been significantly reduced. The blow ratio is the ratio between the nozzle diameter of the die and the diameter of the tubular film in the inflation film manufacturing apparatus.

Hereinafter, the relationship between the bottom opening sealing heat seal wire portion 14A and the pocket opening closing heat sealing wire portions 15c1, 15c2 and 15d1 and 15d2 will be described. The bottom opening sealing heat seal wire portion 14A includes a side seal portion 14x extending inward from one side end by a predetermined length, and a bent seal portion 14y connected to the side seal portion 14x and bent downward to the bottom side. It is formed by an intermediate seal portion 14h and a side seal portion 14x on the other end side. The bottom opening sealing heat seal wire portion 14A is formed by an elevating heat heel device using a heat seal bar having a predetermined shape provided with a bar forming two bent seal portions. The seal line width is, for example, 1.5 to 2.5 mm.

One bent seal portion 14y will be described with reference to FIG. 4B. The bent seal portion 14y has an inclined side 141 diagonally descending from the side seal portion 14x toward the _lower bottom portion side, a bottom side 142 having a predetermined length, and the other inclined _side facing _one inclined side 141. It is composed of 14 ₃ and is formed by bending it into a mortar cross-sectional shape when viewed from the front. The cross-sectional shape of the mortar in front view represents the shape of the cut surface of the mortar cut in the vertical direction. The inclined side 141 is inclined at _a predetermined angle θ1 with the extension line of the _bottom side 142. The inclination angle θ1 is 20 ° to 80 °, and the optimum range is preferably 40 ° to 70 ° within this range. Further, the inclination angle θ2 between the inclination line 14 ₃ on the other side and the extension line of the bottom 142 may be the same as or different from θ 1, and the _two bent seals may be omitted by omitting the intermediate seal portion 14h. The portion 14y may be directly connected by the _bottom 142.

_On the inclined side 141, the folding film 11c on the left side is crossed with the folding crease line 12, and the intersection O is heat-welded. Further, on the inclined side 141, _a part near the bottom of the front film and a part near the bottom of the back film and a part between the back side folded half film are the front and back films starting from the intersection O. The heat-sealed wire portions of the pocket mouth closing at a predetermined angle θ are heat-welded to the bottom opening sealing heat-sealed wire portions toward both side edges of the film at 15c1, 15c2, 15d1, and 15d2, respectively. The same applies to the other bent seal portion 14y.

In this mushroom cultivation bag 10A, the bag body 11A is made of a film having a blow ratio in the range of 2.5 to 3.45, and a bent seal portion is provided on the bottom opening sealing heat seal wire portion 14A. _An intersection O is provided on the inclined side 141, and from this point as a starting point, a part near the bottom of the front film and the front side folded half film and a part near the bottom of the back film and the back side folded half film are between the front and back films. A large amount of film is welded to the bottom opening sealing heat sealing wire portion 14A toward both side edges at pocket opening closing heat sealing wire portions 15c1, 15c2, 15d1, and 15d2 at predetermined angles θ, respectively. Even if the contained material is contained, water leaks even if the film heat-welded portion in the portion where the number of film layers changes is pulled from the surroundings, and the same action and effect as that of the cultivation bag of the first embodiment are exhibited. Become.

Also in the mushroom cultivation bag 10A of the second embodiment, as in the case of the mushroom cultivation bag 10 of the first embodiment, the pocket opening closing heat seal wire portions 15c1, 15c2, 15d1 and 15d2 do not overlap with the intersection O. With the side seal portion 14x as the starting point, a part near the bottom of the front film and a part near the bottom of the front side folded half film and a part near the bottom of the back film and the space between the back side folded half film are directed toward both side edges of the front and back films. It may be heat-welded.

10, 10A Mushroom cultivation bag 11, 11A Bag with horizontal gusset 11a Front film 11a1 Through hole 11b Back film 11c, 11d Folded film 11c1, 11d1 Front side fold film half piece 11c2, 11d2 Back side fold film half piece 11f Bag mouth 12 Fold line 13 Filter 14, 14A Bottom mouth sealing heat seal wire part 14x Side seal part 14y Folded seal part 14h Intermediate seal part 15c1, 15c2, 15d1, 15d2 Pocket mouth closing heat seal wire part 16 Medium 17 _Bagging medium block P1 ~ P ₄ Air pocket

Claims (3)

A flat tube consisting of facing front and back films having a predetermined width and length and facing each other and a folded film facing each other on the left and right by making a crease line at a substantially central portion between the vertically long edges of the front and back films and having a predetermined length is formed. With a horizontal gusset made of plastic film that is cut to the upper end to form a bag opening that is widened at the upper end, and the folded film is folded at the lower end to be heat-welded and sealed at the linear bottom opening sealing heat seal wire portion. It consists of a bag
The inside of the bag is filled with a medium from the bottom formed by filling a predetermined amount of medium to _a predetermined height h1 and unfilled with a height _h2 from the filling part to the bag mouth. It is divided into parts, and a vent hole of a predetermined size is formed in at least one of the front and back films of the unfilled portion, and a filter is attached to the vent hole.
The thickness t of the film is 0.05 mm ≧ t ≧ 0.075 mm, the height h ₁ is in the range of 120 mm to 180 mm, and the ratio of the height h ₁ to the height h ₂ is 3: 7 to. 4.6: 5.4,
The left and right facing fold films are divided into a front side fold film half piece and a back side fold film half piece, respectively, with the crease line as a boundary, and the lower end portion is the bottom opening sealing heat seal wire portion and the crease line. Are crossed and this intersection is thermally coupled, and from the bonding point O as a starting point, a part near the bottom of the front film and the front side folded half film and a part near the bottom of the back film and the back side fold. The half-piece films are heat-welded toward both sides of the front and back films at the pocket opening heat-sealing wire portion forming an angle θ in the range of 45 ° ± 1 ° with respect to the bottom opening sealing heat-sealing wire portion. A mushroom cultivation bag characterized by being present. The bag body is made of a plastic film having an inflation blow ratio in the range of 2.5 to 3.45.
The bottom opening sealing heat seal wire portion has a side seal portion extending inward from one side end of the bag body by a predetermined length, and an inclined side connected to the side seal portion and bent toward the lower bottom portion side. A bent seal portion, an intermediate seal portion having a predetermined length connected to the bent seal portion, a bent seal portion connected to the intermediate seal portion, and a side extending to the other end side connected to the bent seal portion. Formed at the seal,
The inclined side of each bent seal portion is inclined at a predetermined angle with respect to the lower bottom side, the coupling point O is provided on each inclined side, and the pocket mouth closing heat is provided from the coupling point O. The mushroom cultivation bag according to claim 1, wherein the seal wire portion is extended. The cultivation bag according to claim 1 or 2, wherein the pocket mouth closing heat seal wire portion is extended at the angle θ starting from a portion separated from the coupling point O.

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