JP7347898B2 - Packaging bags for agricultural chemicals and packaging methods for agricultural chemicals - Google Patents

Description

The present application relates to a packaging bag for agricultural chemicals and a method for packaging agricultural chemicals.

Various types of packaging bags for agricultural chemicals have been proposed, but the ones related to agricultural chemical packaging bags that are used for throwing solid agricultural chemicals into rice fields or by placing them at water outlets of rice fields (Patent Documents 1 to 3) 2).

Japanese Patent Application Publication No. 2001-10684 Japanese Patent Application Publication No. 2010-83869

Pesticides are transported, for example, in a packaging container such as a paper bag (hereinafter also referred to as a packaging bag). Packaging bags for agricultural chemicals, when filled with solid agricultural chemicals such as powders and granules, are required to be airtight to prevent the agricultural chemicals from deteriorating due to contact with outside air or water, and usually form the exterior part. It has a multi-layer structure in which a packaging material that ensures airtightness is attached to the inside of the packaging material.

In addition, packaging bags filled with agricultural chemicals are required to be strong enough to withstand impacts such as drops, in order to avoid the risk of bag breakage due to dropping, collapsing, and containers rubbing against each other during transportation. If the impact resistance of the packaging bag is low, the inner packaging material used to ensure airtightness will be damaged, such as tearing, resulting in deterioration of the agricultural chemicals and loss of product value. Even if no tears occur, there is a situation unique to the agrochemical industry in that if the exterior part is significantly damaged during transportation, the product value will be lost.

Normally, pesticides are distributed to farmers through various business entities such as the National Federation of Agricultural Cooperatives, but in recent years, farmers who wish to procure pesticides at low prices to reduce costs have been increasing the amount per order unit. In some cases, agricultural chemicals, which have a relatively large amount of agricultural chemicals, are purchased from various entities such as the National Federation of Agricultural Cooperatives, and then delivered directly to farmers by agricultural chemical manufacturers.

In this case, the packaging of pesticides, which have a relatively large quantity per order unit, is packed into multiple small containers that are tied together and are essentially integrated, in order to improve the efficiency of opening and mixing the pesticides. Large-capacity packaging bags are often used rather than state-based packaging. When the content of the bag increases, the weight of the agricultural chemicals filled increases, and the load applied to each part of the bag also increases, increasing the risk of bag breakage. Additionally, if pesticides are to be delivered directly to farmers, the delivery distance will be extended, which increases the risk of bag breakage. There is a growing need for strength to withstand impact.

On the other hand, as mentioned above, packaging bags for pesticides are required to be airtight, and the packaging materials used inside to ensure airtightness include, for example, sheets made of vapor-deposited aluminum film or sheets made of aluminum. In order to increase the strength of the packaging bag filled with agricultural chemicals, the packaging material becomes thicker, making it difficult to seal the packaging bag after filling it with agricultural chemicals. At times, there were problems such as problems with airtightness.

Therefore, an object of the present invention is to provide a packaging bag for agricultural chemicals and a method for packaging agricultural chemicals that can both improve the strength of the packaging material as the content increases and maintain airtightness.

In order to solve the above problems, the present invention fixes an inner package formed of a moisture-impermeable sheet inside the outer package in a state in which a portion other than the area along the opening is not adhered to the outer package. I made it.

Specifically, the present invention relates to a packaging bag for agricultural chemicals, which is formed of an outer packaging body made of paper with a reinforcing material made of resin lined inside and a moisture-impermeable sheet, and which is made of granular, powdery or an inner packaging body capable of being filled with a liquid agricultural chemical; the inner packaging body is fixed within the outer packaging body in a non-adhesive state with respect to the outer packaging body, except for the area along the opening of the inner packaging body; There is.

Here, along the opening of the inner package is a region on the outer surface of the inner package that is along the opening through which the pesticide filled into the inner package passes, and for example, along the opening of the inner package. The area may be in contact with the edge, or it may be an area somewhat spaced apart from the edge of the opening.

In the above packaging bag, the outer packaging body is reinforced with a resin reinforcing material. Therefore, even if an impact is applied from the outside to any part of the outer packaging material, damage to the outer packaging material is suppressed as much as possible by the reinforcing material. Furthermore, in the case of the above-mentioned packaging bag, since the part of the inner package excluding the area along the opening is fixed to the outer package in a non-adhesive state, the material forming the outer package is Damage to the inner packaging is caused by the space and misalignment between the two materials that are caused by the materials forming the inner packaging not being in perfect contact with each other, and by alleviating the impact from an oblique direction such as a fall. Damage to the outer packaging material is also suppressed as much as possible.

The possibility of damage to a packaging bag when an impact is applied from the outside increases as the content of the bag increases. The inner packaging is reinforced and the part of the inner packaging except for the area along the opening is fixed to the outer packaging in a non-adhesive state, so that localized impacts to the outer packaging will not be applied to the inner packaging. At the same time, the impact on the outer packaging body is also reduced due to the space between the resin reinforcing material, the material forming the outer packaging body, and the material forming the inner packaging body, which is caused by the materials forming the outer packaging body not being in complete contact with each other. Damage to the outer packaging body and the inner packaging body due to misalignment, etc. is suppressed as much as possible. Therefore, there is no need to provide the inner package with enough strength to withstand damage that may occur when an impact is applied from the outside. Therefore, with the above-mentioned packaging bag, even if the content of the bag is increased, the inner packaging maintains airtightness to prevent agricultural chemicals from deteriorating due to contact with outside air or water, while the outer packaging The outer packaging body can withstand the impact applied from can be suppressed to

In addition, the inner wrapping body may be formed of a sheet whose sealing temperature when sealing the opening of the inner wrapping body by thermal welding by heating from the outside of the outer wrapping body is lower than the melting point of the reinforcing material. . If the inner package is formed of a sheet having such a melting point, it is possible to prevent the reinforcing material reinforcing the outer package from melting when thermal welding is performed by heating the outer package from the outside.

Further, the inner package may have a portion of the surface that contacts the outer package along the opening of the inner package adhered to the inside of the outer package using an adhesive. If the part along the opening of the inner packaging is adhered to the outer packaging with adhesive, when filling the inner packaging with agricultural chemicals, if you widen the opening of the outer packaging, the opening of the inner packaging will also expand. Therefore, the possibility that pesticides will accidentally enter the gap between the outer package and the inner package can be suppressed as much as possible.

Further, in the inner packaging body, a part for sealing the opening of the outer packaging body is provided between the heat-welded part that seals the opening of the inner packaging body and the edge of the opening. Good too. If such a part is provided, for example, even if the sewing thread for sealing the opening of the outer packaging body is sewn in such a manner that it passes through the inner packaging body, Even when the opening of the body is folded back and secured with craft tape, the airtightness of the inner package is not impaired.

Further, the moisture-impermeable sheet may be a sheet formed by vapor-depositing aluminum onto a film or a sheet made of aluminum. With such a sheet, it is possible to ensure airtightness within the inner package in which the pesticide is filled, so that deterioration of the pesticide due to contact with outside air or water can be suppressed.
Note that examples of the aluminum sheet include an aluminum sheet with a three-layer structure in which aluminum is sandwiched between different types of thermoplastic resin films such as nylon and polyethylene.

Further, the outer packaging body may be a packaging body in which a resin cloth is used as a reinforcing material and pasted on kraft paper. With such an outer package, even if an impact is applied from the outside of the packaging bag, damage to the outer package is suppressed as much as possible by the resin cloth. Furthermore, even if a small portion of the kraft paper is torn due to a localized impact on the packaging bag, the cloth will suppress the formation of holes that penetrate the inside and outside of the outer packaging as much as possible.

Note that a resin cloth refers to a resin in which 6 to 10 flat threads of resin such as polyethylene are woven vertically and horizontally within one square inch. The resin cloth used as the reinforcing material of the present invention is preferably one in which eight flat threads made of polyethylene are combined in one square inch (8×8).

Further, the above packaging bag for agricultural chemicals may be filled with an amount of 5 to 30 kg of agricultural chemicals.
Moreover, the present invention can also be viewed from the aspect of a method. That is, the present invention is, for example, a method for packaging agricultural chemicals, which includes the step of filling the above-mentioned packaging bag for agricultural chemicals with agricultural chemicals, and thermally welding the opening of the inner packaging body by heating from the outside of the outer packaging body. The method may include a step of sealing and a step of sealing the opening of the outer package.

The packaging bag for agricultural chemicals and the packaging method for agricultural chemicals described above can both improve the strength of the packaging material as the content increases and maintain airtightness.

FIG. 1 is a configuration diagram of a packaging bag according to an embodiment. FIG. 2 is a diagram showing a method of handling a packaging bag. FIG. 3 is an exploded perspective view showing the structure of the outer package.

Embodiments will be described below. The embodiments shown below are merely illustrative and do not limit the technical scope of the present disclosure to the following aspects.

FIG. 1 is a configuration diagram of a packaging bag according to an embodiment. FIG. 1(A) shows a front view of the packaging bag 1. Further, FIG. 1(B) shows a cross-sectional view of the packaging bag 1 taken along the dashed line indicated by the symbol AA in FIG. 1(A). Further, FIG. 1(C) shows a cross-sectional view of the packaging bag 1 taken along the dashed line indicated by the symbol BB in FIG. 1(A). In order to facilitate understanding of the packaging bag 1, FIG. 1 shows the packaging bag 1 filled with agricultural chemical N and sealed.

As shown in FIG. 1, the packaging bag 1 is a packaging bag for agricultural chemicals N that includes an outer package 2 and an inner package 3. The outer packaging body 2 is a bag-shaped packaging body that forms the exterior of the packaging bag 1. Further, the inner package 3 is a bag-shaped package fixed inside the outer package 2. Pesticide N is filled in the inner package 3.

The outer packaging body 2 is formed of a sheet-like material. That is, the outer packaging body 2 is a cylindrical shape in which a long sheet is wound into a cylindrical shape along the longitudinal direction, and the pasted portion R4 is formed by pasting together the edges on both sides of the overlapping sheets with an adhesive. The sheet body was cut to an appropriate length, one of the two openings formed in the cylindrical sheet body was closed with a seal 5, and the sewing thread 7 was sewn with a sewing machine to form a bag shape. It is something.

The inner package 3 is also similar to the outer package 2, and is made of a sheet-like material. However, while the outer package 2 is made of paper, the inner package 3 is made of a thermoplastic resin film with aluminum vapor-deposited (also called aluminum vapor-deposited film), or aluminum made of nylon, polyethylene, or other types of film. It is made of aluminum sheets with a three-layer structure sandwiched between different thermoplastic resin films. Therefore, the inner packaging body 3 has a cylindrical shape in which a welded portion R5 is formed by winding a long sheet into a cylindrical shape along the longitudinal direction and bonding the sheets together by thermally welding the edges on both sides of the overlapping sheets. The sheet body is cut to an appropriate length, and one of the two openings formed in the cylindrical sheet body is heat welded to form a welded part R3, and the opening is closed to form a bag. It is made into a shape.

Then, in the packaging bag 1, the inner packaging body 3 is inserted into the bag-shaped outer packaging body 2 as described above, and the area along the opening 8 of the inner packaging body 3 is adhered to the inner surface of the outer packaging body 2. be done. Thereby, the inner package 3 is fixed within the outer package 2 via the adhesive portion R2. Therefore, in the packaging bag 1, when the pesticide N is filled into the inner package 3, the opening 9 of the outer package 2 is opened and expanded, and the opening 8 of the inner package 3 is also opened and expanded. Become. Therefore, in the packaging bag 1, the pesticide N will not accidentally enter the gap between the outer package 2 and the inner package 3.

Then, the inner package 3 is filled with the pesticide N by thermally welding the opening 8 of the inner package 3 with the pesticide N filled in the inner package 3 to form a welded part R1. The inside of the inner packaging body 3 is sealed. In addition, the outer packaging body 2 is sewn with sewing thread 6 with the opening 9 covered by the seal 4, thereby sealing the inside of the outer packaging body 2 in which the inner packaging body 3 is housed. .

FIG. 2 is a diagram showing a method of handling the packaging bag 1. In the packaging bag 1 before the pesticide N is sealed, both the opening 9 of the outer package 2 and the opening 8 of the inner package 3 are open, as shown in FIG. 2(A). ing. Since the inner package 3 is fixed inside the outer package 2 via the adhesive part R2 along the opening 8 of the inner package 3, the inner package When the pesticide N is filled into the inner package 3, the pesticide N is filled into the inner package 3 without accidentally entering the gap between the outer package 2 and the inner package 3.

Then, when sealing the pesticide N, as shown by the thick arrow in FIG. The inner wrapping 3 formed of the film melts slightly, and the inner surfaces of the inner wrapping 3 are thermally welded together along the opening 8. As a result, the inside of the inner packaging body 3 is in a sealed state. Thereafter, as shown in FIG. 2(D), the outer packaging body 2 is sewn with the sewing thread 6 with the opening 9 closed by the seal 4, so that the inner packaging body 3 is sewn. The inside of the accommodated outer package 2 is sealed. In addition, the inner packaging body 3 is provided with a seam allowance for sewing the sewing thread 6 between the welded portion R1 and the edge of the opening 8. Therefore, even if the sewing thread 6 is sewn in such a manner that it passes through the inner wrapping body 3, the airtightness of the inner wrapping body 3 will not be impaired.

Although not illustrated in FIGS. 1 and 2, the opening 9 of the outer package 2 may be folded back and secured with craft tape. Even in this case, the airtightness of the inner packaging body 3 is not impaired by the welded portion R1.

Through the above steps, packaging of agricultural chemical N is completed. Therefore, the pesticide N can be transported while being packaged in the packaging bag 1.

By the way, the outer packaging body 2 is made of kraft paper that forms the exterior, and a reinforcing material made of resin is pasted on the inside. FIG. 3 is an exploded perspective view showing the structure of the outer packaging body 2. As shown in FIG. As shown in FIG. 3, the outer packaging body 2 is a sheet of kraft paper 2A with a reinforcing cloth 2B pasted on one side. While the kraft paper 2A is made of paper, the reinforcing cloth 2B is a sheet made by weaving long and thin resin tapes in the vertical and horizontal directions as shown in Figure 3. It exhibits higher strength than kraft paper 2A against the applied tensile force. The reinforcing cloth 2B is entirely adhered to the kraft paper 2A with an adhesive. Therefore, even if an impact is applied from the outside to any part of the packaging bag 1 while the kraft paper 2A is exposed as the exterior surface of the packaging bag 1, damage to the kraft paper 2A is suppressed as much as possible by the reinforcing cloth 2B. Ru. Moreover, even if the kraft paper 2A is partially scraped off from the reinforcing cloth 2B due to a local impact on the packaging bag 1, the reinforcing cloth 2B is a sheet body that is completely adhered to the kraft paper 2A. Therefore, the occurrence of holes penetrating the inside and outside of the outer packaging body 2 is firstly suppressed as much as possible by the reinforcing cloth 2B.

While the outer package 2 is made of kraft paper 2A reinforced with reinforcing cloth 2B, the inner package 3 is a film made of a resin film with aluminum vapor-deposited, or an aluminum sheet. Therefore, when a shock is applied to the packaging bag 1 due to dropping or the like, the impact is applied to the outer package 2 and the inner package 3. However, in the packaging bag 1, the inner packaging 3 is fixed within the outer packaging 2 in a non-adhesive state to the outer packaging 2, except for the adhesive portion R2. Even if a local impact is applied from the outside, the outer packaging 2 and the inner packaging 3 will slide against each other in that part, so that the local impact on the outer packaging 2 due to the impact will not affect the inner packaging 3. is alleviated.
In addition, if there is an external impact that causes twisting of the package 1, if the inner package 3 is completely adhered to the outer package 2, the inner package 3 and the outer package 2 will be damaged. There is a possibility that the outer package 2 may be damaged due to elongation and tension caused by the difference in strength, but the inner package 3 is not adhered to the outer package 2 except for the adhesive part R2 of the package 1. Since it is fixed in the outer packaging body 2 in this state, such damage is also suppressed as much as possible. As a result, damage to the packaging material of the package 1 is suppressed as much as possible.

As described above, according to the packaging bag 1, since the inner package 3 is fixed within the outer package 2 in a non-adhesive state to the outer package 2 except for the adhesive portion R2, it may not be easily dropped, etc. The impact of Because the outer package 2 and the inner package 3 slide against each other, the influence of local impact of the outer package 2 on the inner package 3 is reduced. At the same time, the impact on the outer package 2 can also be alleviated. Therefore, it is not necessary to provide the inner package 3 with enough strength to withstand damage to the inner package 3 that may occur when an impact is applied from the outside. Therefore, with the packaging bag 1 of the embodiment described above, even if the content of the bag is increased, the inner packaging body 3 can ensure airtightness to prevent agricultural chemical N from deteriorating due to contact with outside air or water. It is possible for the outer packaging body 2 to withstand the impact applied to the packaging bag 1 from the outside, and it is possible to simultaneously improve the strength of the packaging material and maintain airtightness as the content increases.

A test article corresponding to the packaging bag 1 of the above embodiment was manufactured and verified, and the verification results are shown below.

In this verification, kraft paper 2A with a basis weight of 75 g/m ² was made of polyethylene with a lamination thickness (thickness in the laminated state) of 20 μm and the number of punches per square inch of 8 in both the vertical and horizontal directions. The outer packaging body 2 was created by laminating a resin cloth as a reinforcing cloth 2B, and a 15 μm thick nylon film was laminated with 7 μm thick aluminum, and then a 70 μm thick LLDPE (Linear Low Density Polyethylene). A packaging bag 1 was prototyped using an inner packaging body 3 made using an aluminum sheet laminated with a plastic film. Since the reinforcing cloth 2B of the outer packaging body 2 used in this prototype has a melting point of 150°C, the sealing temperature when sealing the inner packaging body 3 by heat sealing is 145°C, which is slightly lower than the melting point of the reinforcing cloth 2B. And so.

The above prototype was filled with 20 kg of agricultural chemical N and sealed, and a drop test was conducted to simulate the impact expected during transportation.Specifically, the bag of the prototype was dropped from a height of 2.0 m (a) horizontally; We conducted two tests of a) dropping from the top corner of the bag and c) horizontally dropping it to the corner of a pallet (loading platform for loading cargo), but no leakage of pesticide N due to damage to packaging bag 1 was confirmed. . On the other hand, in a comparative example of a packaging bag in which there was no inner packaging of aluminum foil and the kraft paper was not reinforced with resin cloth, leakage of agricultural chemicals due to damage to the packaging bag was confirmed in a similar drop test. Therefore, compared to the comparative example, the packaging bag 1 of the above embodiment can maintain airtightness to prevent pesticides from deteriorating due to contact with outside air or water, and can withstand shocks applied from the outside. It is possible to endure.

1. Packaging bag 2.. Outer packaging 2A.. Kraft paper 2B.. Reinforcement cloth 3.. Inner packaging 4.. Seal 5.. Seal 6.. Sewing thread 7.. Sewing thread 8.. Opening. 9... Opening R1... Welded part R2... Adhesive part R3... Welded part R4... Adhesive part R5... Welded part N... Pesticide

Claims (8)

An outer packaging made of paper with a reinforcing material made of resin lined inside;
An inner packaging body formed of a moisture-impermeable sheet and capable of being filled with granular, powdered or liquid agricultural chemicals;
The inner packaging is fixed within the outer packaging in a non-adhesive manner to the outer packaging , with a portion of the inner packaging excluding the area along the opening of the inner packaging, and a portion of the inner packaging that is in contact with the outer packaging. a portion of the body along the opening forms an adhesive bonded within the outer wrapper;
The adhesive part is formed closer to the bottom of the inner packaging than the part that seals the opening of the inner packaging.
Packaging bags for agricultural chemicals. The inner packaging body is formed of a sheet having a sealing temperature lower than the melting point of the reinforcing material when the opening of the inner packaging body is sealed by thermal welding by heating from the outside of the outer packaging body. ,
The packaging bag for agricultural chemicals according to claim 1. The inner packaging body is configured such that the adhesive portion is adhered to the inside of the outer packaging body using an adhesive.
The packaging bag for agricultural chemicals according to claim 1 or 2. In the inner packaging body, the part that seals the opening of the outer packaging body is provided between the heat-welded part that seals the opening of the inner packaging body and the edge of the opening of the inner packaging body. being given,
The packaging bag for agricultural chemicals according to claim 3. The moisture-impermeable sheet is a sheet made of aluminum deposited on a film or a sheet made of aluminum.
A packaging bag for agricultural chemicals according to any one of claims 1 to 4. The outer packaging body is a packaging body in which a resin cloth is attached to kraft paper as the reinforcing material,
A packaging bag for agricultural chemicals according to any one of claims 1 to 5. The amount of agricultural chemicals to be filled is 5 to 30 kg.
A packaging bag for agricultural chemicals according to any one of claims 1 to 6. Filling the packaging bag for agricultural chemicals according to any one of claims 1 to 7 with the agricultural chemicals;
sealing the opening of the inner package by heat welding by heating from the outside of the outer package;
sealing the opening of the outer package;
How to package pesticides.

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