JP2017189120A - Agricultural tube - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an agricultural tube that allows more plants to be irradiated with sunlight.SOLUTION: According to the present invention, an agricultural tube 1 is formed in a tubular shape by a first film 11 and a second film 12, which are arranged opposite to each other. Both side portions in the longitudinal direction of the first film 11 and the second film 12 are joined to form a pair of side joint portions 13. A light reflection layer 11a is formed on the first film 11. The agricultural tube 1 installed in the vicinity of the plant to be cultivated while one end side thereof is sealed. Then, gas is introduced from the other end side of the agricultural tube 1 to inflate the tube into a tubular shape. At this time, the agricultural tube 1 is installed so that the first film 11 is disposed on the vertically upper side and the second film 12 is arranged on the vertically lower side. Here, light from above can be reflected by the light reflecting layer 11a to irradiate the plant. Thus, the plant can be irradiated with more sun light, and the quality of agricultural crops and the production efficacy of agricultural crops can be improved.SELECTED DRAWING: Figure 4

Description

  The present invention relates to an agricultural tube.

  Traditionally, greenhouse cultivation has been carried out in greenhouse space to grow plants such as vegetables and fruit trees. It is possible to ship out-of-season crops by forcing and restraint cultivation by house cultivation, and it is possible to ship vegetables, fruit trees, etc. without depending on the season.

  In house cultivation, in order to adjust the indoor air temperature, for example, there is a method of adjusting the indoor air temperature through the agricultural tube by blowing warm air into the agricultural tube and circulating the hot air.

  On the other hand, plants such as vegetables and fruit trees are used as plant nutrients by fixing carbon dioxide in the atmosphere by photosynthesis. However, the concentration of carbon dioxide in the atmosphere is about 400 ppm, and there is a problem that the concentration of carbon dioxide in the atmosphere is too low for light.

  Therefore, Patent Document 1 discloses a plant growing method using an agricultural tube that transmits carbon dioxide gas. The plant growing method described in Patent Document 1 is such that an agricultural tube is disposed in the vicinity of a plant, and a certain amount of carbon dioxide gas is introduced into the agricultural tube made of polydimethylsiloxane that transmits carbon dioxide gas by a gas cylinder. It is a plant growing method that can increase the yield of agricultural products such as vegetables and fruit trees.

JP 2006-345829 A

  In the plant growing method described in Patent Document 1, although there is a description that carbon dioxide supplied at night is used for photosynthesis, means for irradiating more sunlight to plants such as vegetables and fruit trees at the time of photosynthesis Or the suggestion is not described, and even if carbon dioxide can be introduced, the characteristics are not fully utilized. On the other hand, by giving more light to plants such as vegetables and fruit trees, the growth of plants is promoted, and the quality of crops and the production efficiency of crops are improved.

  The present invention has been made in view of such a situation, and it is possible to irradiate plants such as vegetables and fruit trees with more light, thereby improving the quality of crops and the production efficiency of crops. The purpose is to provide a tube for agriculture.

  The inventors of the present invention have made extensive studies in order to solve the above-mentioned problems. As a result, the present inventors have found that an agricultural tube provided with a light reflection layer on a part of a cylindrical film can solve the above-mentioned problems. The invention has been completed.

(1) The first film and the second film that are arranged to face each other are configured in a cylindrical shape,
It is an agricultural tube for gas insertion in which both sides in the longitudinal direction of the first film and the second film are joined to form a pair of side joints,
The agricultural film, wherein the first film includes a light reflecting layer.

  Although it has been conventionally performed to arrange an agricultural tube in the vicinity of a plant in order to adjust the indoor temperature and gas atmosphere during house cultivation, the present invention is further limited to the necessary aspects of the agricultural tube itself. It has a reflection function and makes effective use of light. In particular, as will be described later, agricultural tubes used for the purpose of adjusting indoor temperature and supplying carbon dioxide are more effective in supplying heat and carbon dioxide to plants such as vegetables and fruit trees. In order to achieve this, it is arranged as close as possible to plants such as vegetables and fruit trees. For this reason, it is possible to effectively use the reflected light particularly effectively.

(2) The agricultural tube according to (1), wherein the side joints are fused.

(3) The agricultural tube according to (1) or (2), wherein the second film is a polyolefin resin film.

(4) The agricultural tube according to any one of (1) to (3), wherein the pair of side side joints are formed toward the inner side of the cylindrical shape.

(5) The first film has at least the light reflecting layer, a sheet base material, a reinforcing resin layer, and a heat seal layer laminated in this order,
The light reflection layer includes a resin component having a thickness of 0.5 μm or more and 4 μm or less and containing a pigment capable of reflecting light in the visible light region,
The sheet base material is a porous thermoplastic resin sheet having voids having an average diameter of 1 μm or more and 50 μm or less, a porosity of 35% or more and 60% or less, and a thickness of 30 μm or more and 90 μm or less,
The reinforcing resin layer is a resin layer having a thickness of 5 μm or more and 20 μm or less and containing an ethylene-vinyl acetate copolymer,
The agricultural tube according to any one of (1) to (4), wherein the heat seal layer is a polyolefin-based resin layer having a mesh structure.

  (6) The first film has at least the light reflecting layer, the reinforcing resin layer, and the heat seal layer laminated in this order, and the light reflecting layer has an average diameter of 1 μm or more and 50 μm or less. A porous thermoplastic resin sheet having a porosity of 35% to 60% and a thickness of 30 μm to 90 μm, and the reinforcing resin layer has a thickness of 5 μm to 20 μm, The agricultural tube according to any one of (1) to (4), wherein the tube is a resin layer containing an ethylene-vinyl acetate copolymer, and the heat seal layer is a polyolefin-based resin layer having a mesh structure.

(7) In the first film and / or the second film, through holes having an average diameter of 200 μm or more and 1200 μm or less and an aperture ratio of 3% or more and 10% or less with respect to the surface area of the agricultural tube are formed, The agricultural tube according to any one of (1) to (4).

(8) In a state where one end side of the agricultural tube according to any one of (1) to (7) is sealed, it is installed near the plant to be cultivated, and gas is inserted from the other end side of the agricultural tube. A plant growing method for controlling the growth of the plant using the gas property,
A plant growing method in which the agricultural tube is installed so that the first film is disposed vertically upward and the second film is disposed vertically downward.

(9) The plant growing method according to (8), wherein a gas containing carbon dioxide of 400 ppm to 1600 ppm is used as the gas.

  The agricultural tube of the present invention makes it possible to irradiate a plant with more sunlight, and can improve the quality of crops and the production efficiency of crops.

It is the figure which represented typically the use condition of the agricultural tube of this invention. It is an AA cross-sectional schematic diagram of FIG. It is BB sectional drawing of FIG. 1, Comprising: It is the figure which represented typically the state which is not supplying gas. It is BB sectional drawing of FIG. 1, Comprising: It is the figure which represented typically the state which is supplying the gas. It is a cross-sectional schematic diagram which shows an example of the laminated structure of a 1st film. It is the modification of this invention, Comprising: It is the figure which represented typically the agricultural tube in which the side part junction part is formed toward the cylindrical inside. It is the modification of this invention, Comprising: It is the figure which represented typically the agricultural tube | pipe obtained by forming a side junction part in the state which gusseted both sides of the 2nd film inside. It is a cross-sectional schematic diagram which shows the example of other embodiment of the laminated structure of a 1st film.

  Hereinafter, specific embodiments of the present invention will be described in detail. However, the present invention is not limited to the following embodiments, and may be implemented with appropriate modifications within the scope of the object of the present invention. can do.

<Agricultural tube>
[overall structure]
The agricultural tube 1 of this embodiment is comprised by the 1st film 11 and the 2nd film 12 at the cylinder shape, as shown in FIGS. The agricultural tube 1 is formed in a cylindrical shape by forming a pair of side joints 13 in which the first film 11 and the second film 12 are arranged to face each other and both side portions in the longitudinal direction of each film are joined together. Has been. In addition, in this specification, "cylindrical" is the concept including the state before inserting gas like the agricultural tube of FIG. 3, and the state after inserting gas like the agricultural tube of FIG. is there. Moreover, the agricultural tube of this invention should just be a cylinder, and, for example, one of the start end and the termination | terminus may be sealed like FIG.

  The inner diameter of the agricultural tube varies depending on the size of the house cultivation, the area of the farmland, the type of plant, and the purpose for which the agricultural tube is used, and is not particularly limited. For this purpose, an agricultural tube having an inner diameter of 10 cm to 100 cm is preferably used.

[First film]
The 1st film 11 regarding this invention is a film which has a light reflection layer, and has a function which reflects sunlight by being arrange | positioned at the vertically upper side of the agricultural tube. If the 1st film 11 regarding this invention is equipped with the light reflection layer which reflects the light of visible region (400 nm to 750 nm), there will be no restriction | limiting in particular. The light reflecting layer means a layer that reflects light in the visible light region (400 nm to 750 nm). More specifically, the first film 11 preferably has a total reflectance of light of 70% or more, preferably 80% or more, particularly preferably 90% or more, at wavelengths of 500 nm, 600 nm, and 700 nm. . The total reflectance is measured with an ultraviolet / visible / near-infrared spectrophotometer (manufactured by Shimadzu Corporation, trade name “UV-3600”) using an integrating sphere attachment device (ISR-3100) and an incident angle of 8 °. In the visible region, the reflectance (total reflectance) at 500 nm, 600 nm, and 700 nm can be measured.

  The first film 11 may be a single layer film containing a pigment that can reflect light in the visible light region such as titanium oxide. In this case, the entire first film constitutes a light reflecting layer. As the base resin film, a known thermoplastic resin such as polyethylene or polypropylene can be used.

  The first film 11 may be a multilayer laminate. By providing a multilayer structure, light reflection performance can be imparted and gas permeability such as carbon dioxide gas can be controlled. That is, conditions necessary for plant photosynthesis can be more efficiently imparted to plants. As will be described later, a porous thermoplastic resin having both light reflection performance and gas permeability may be used as the light reflection layer.

  FIG. 5 is a schematic cross-sectional view showing an example of the first film 11 having a multilayer structure. The first film 11 is a laminated film in which a light reflecting layer 11a, a sheet base material 11b made of a porous thermoplastic resin, a reinforcing resin layer 11c, and a heat seal layer 11d are laminated in this order. Hereinafter, each layer will be described.

(Light reflection layer)
The light reflecting layer 11a is, for example, an ink layer (for example, a white ink layer) formed by including a pigment (for example, a white pigment) that can reflect light in a visible light region provided on at least one surface of the sheet base material. ). Moreover, the aspect which makes the layer which used the porous thermoplastic resin as the light reflection layer 110a can also be mentioned. If necessary, various additives such as a plasticizer and a dispersant may be added as long as the object of the present invention is not hindered. By providing the light reflecting layer 11a, the light irradiated on the surface of the agricultural tube 1 can be reflected, and more light can be given to plants such as vegetables and fruit trees. As will be described later, the light reflecting layer 11a may be a layer containing a pigment capable of reflecting light in the visible light region, or may reflect the porous thermoplastic resin constituting the sheet base material 11b described later. The layer may be the layer 11a.

  Examples of pigments that can reflect light in the visible light region include anatase-type or rutile-type titanium oxides, titanium oxides whose surfaces are treated with metal oxides such as Al and Si, constitutions such as calcium carbonate and barium sulfate. Examples thereof include pigments and other pigments that can reflect light in the visible light region, as long as they do not interfere with the object of the present invention. As the titanium oxide contained in the light reflecting layer, those having an average particle diameter of 0.1 μm or more and 0.5 μm or less are preferably used. The blending ratio of the pigment capable of reflecting light in the visible light region in the light reflecting layer 11a is preferably 10% by mass or more and 50% by mass or less with respect to the total resin components in the light reflecting layer.

  The resin component contained in the light reflecting layer 11a is not particularly limited as long as it is a resin having an upper light reflecting function, such as a polyurethane resin and a polyester resin, and preferably a polyurethane resin. Examples of the polyurethane resin include resins such as polyester polyurethane, polyether polyurethane, polyether polyester polyurethane, polycarbonate polyurethane, and polycaprolactam polyurethane, and mixtures thereof.

  The thickness of the light reflecting layer 11a is not particularly limited as long as it does not inhibit the effect of the present invention, but is preferably 0.5 μm or more and 4 μm or less. It is preferable that the thickness of the light reflecting layer 11a is 0.5 μm or more because the light reflectivity of the agricultural tube is improved. By setting the thickness of the light reflecting layer 11a to 4 μm or less, as will be described later, it is possible to provide an agricultural tube having air permeability that can supply carbon dioxide gas to plants such as vegetables and fruit trees.

The light reflecting layer 11a can be formed by coating on the surface of a sheet base material to be described later by a coating method such as a known printing method. As a coating method, for example, a gravure coater, reverse roll coater, spray coater, knife coater, wire bar coater, air knife coater, doctor blade coater, dipping coater, die coater, etc. Then, solid printing is performed at 0.2 g / m ² or more and 0.7 g / m ² or less (dry thickness), and drying is performed to form the light reflection layer 11a. The drying conditions are not particularly limited as long as the above-mentioned sheet base material 11b and the resin component are not deteriorated.

(Sheet base material)
The porous thermoplastic resin constituting the sheet base material 11b can be produced, for example, by forming a film of a resin composition containing a thermoplastic resin and a filler with a known extruder and then performing a stretching process. it can. Thermoplastic resins include homopolymers of olefins such as ethylene, propylene, butene, hexene or copolymers of two or more olefins, one or more olefins and one or more polymerizable monomers that can be polymerized with the olefins. Polyolefin resins such as copolymers, acrylic resins such as polymethyl acrylate, polymethyl methacrylate, ethylene-ethyl acrylate copolymers, butadiene-styrene copolymers, acrylonitrile-styrene copolymers, polystyrene, styrene- Styrene resins such as butadiene-styrene copolymer, styrene-isoprene-styrene copolymer, styrene-acrylic acid copolymer, vinyl fluoride resins such as vinyl chloride resin, polyvinyl fluoride, polyvinylidene fluoride, 6 -Nylon, 6,6-nylon, 1 -Amide resins such as nylon, saturated ester resins such as polyethylene terephthalate and polyprebutylene terephthalate, polycarbonate, polyphenylene oxide, polyacetal, polyphenylene sulfide, silicone resin, thermoplastic urethane resin, polyether ether ketone, polyether imide, various Examples thereof include thermoplastic elastomers and crosslinked resins. These may be one type or a combination of two or more types of thermoplastic resins. Among the above, polyolefin resins can be preferably used from the viewpoints of heat resistance, water resistance, chemical resistance, cost, and the like.

  The filler is used to generate fine voids in the sheet base material when the thermoplastic resin sheet is stretched to form the sheet base material 11b. As the filler, a known inorganic filler or organic filler can be used, and it is not particularly limited. Examples of the inorganic filler include heavy calcium carbonate, light calcium carbonate, calcined clay, talc, silicon oxide, diatomaceous earth, titanium oxide, magnesium oxide, zinc oxide, and barium sulfate. These may be surface-treated with a fatty acid or the like. Among these, heavy calcium carbonate, light calcium carbonate, fired clay, and talc are preferable because they are inexpensive and have good moldability. As the inorganic filler, those having an average particle size of usually 0.01 μm to 15 μm, preferably 0.01 μm to 8 μm, can be suitably used. The “average particle size” is defined as a statistical average value of particle size distribution measured on a volume basis, and is a known particle size distribution measuring device (for example, trade name “LA-920”, manufactured by Horiba, Ltd.). ) Means the value measured by.

  The sheet base material 11b made of a porous thermoplastic resin has vacancies with an average diameter of 1 μm or more and 50 μm or less, a vacancy rate of 35% or more and 60% or less, and the thickness of the sheet base material 11b is 30 μm or more. It is preferable that it is 90 micrometers or less. When the sheet base material 11b is in such a range, while maintaining the strength of the sheet base material 11b, as will be described later, the agricultural material has a breathability enough to supply carbon dioxide to plants such as vegetables and fruit trees. It can be a tube.

Here, the porosity indicates the ratio of voids in the sheet base material and can be calculated by the following formula I. In formula I, ρo represents the true density of the laminate, and ρ represents the density of the laminate. ρ is the density of the laminate in accordance with JIS P 8118. Unless the material before stretching contains a large amount of air, the true density is approximately equal to the density before stretching. The true density can be obtained by measuring and calculating by a dry density measuring method by a constant volume expansion method. For example, the true density can be measured using, for example, a dry automatic density meter “Acpic 1330” manufactured by Shimadzu Corporation, a multi-volume density meter “Acpic 1330 type” manufactured by Micromeritex Corporation, and the like.
Porosity (%) = {(ρo−ρ) / ρo} × 100 (Formula I)

  The sheet base material 11b made of a porous thermoplastic resin is produced by forming a sheet base material-forming resin composition containing a thermoplastic resin and a filler with a known extruder, and then performing a stretching process. The Thermoplastic composed of two or more layers using a co-extrusion machine using two or more types of resin compositions for forming a sheet base material using different thermoplastic resins or changing the blending ratio of the filler. A resin sheet may be formed.

  The obtained thermoplastic resin sheet is stretched by a known method. By stretching a thermoplastic resin sheet comprising a resin composition for forming a sheet base material containing a filler, peeling occurs at the interface between the filler and the thermoplastic resin, and the peeling that occurs at this interface is the thermoplastic resin sheet. It is propagated and expanded by stretching. Thereby, a space | gap is formed in a thermoplastic resin sheet, and a porous thermoplastic resin sheet can be obtained. As a method of stretching the thermoplastic resin sheet, a known stretching method can be used. For example, the thermoplastic resin sheet is stretched in a uniaxial or biaxial direction by longitudinal uniaxial stretching, longitudinal uniaxial multistage stretching, transverse uniaxial stretching, longitudinal and transverse sequential biaxial stretching, longitudinal and transverse simultaneous biaxial stretching, or a combination thereof. . In the present embodiment, the porous thermoplastic resin sheet is obtained by stretching the thermoplastic resin sheet in at least a uniaxial direction. Although the temperature at the time of extending | stretching is based also on the thermoplastic resin to be used, it extends | stretches in the temperature below the melting point below the glass transition temperature of a thermoplastic resin.

(Reinforced resin layer)
In order to increase the strength of the first film 11, a reinforcing resin layer 11c may be provided on the sheet base material 11b directly or via another layer. The reinforcing resin layer 11c is not particularly limited as long as it does not inhibit the effect of the present invention. For example, the reinforcing resin layer 11c is made of a resin containing an ethylene-vinyl acetate copolymer having a vinyl acetate content of 10% by mass to 30% by mass. Can be mentioned. If it is a layer made of a resin containing an ethylene-vinyl acetate copolymer having a vinyl acetate content of 10% by mass or more and 30% by mass or less, it is excellent in extrusion lamination suitability and, as will be described later, such as vegetables and fruit trees. It can be set as the agricultural tube which has air permeability of the grade which can supply a carbon dioxide gas to a plant.

  The thickness of the reinforcing resin layer 11c is not particularly limited as long as it does not inhibit the effects of the present invention, but is preferably 5 μm or more and 20 μm or less. By setting the thickness of the reinforcing resin layer to 5 μm or more, workability at the time of lamination processing is improved, and the strength of the sheet base material 11b as a reinforcing material can be maintained. By setting the thickness of the reinforcing resin layer 11c to 20 μm or less, preferably 10 μm or less, as described later, an agricultural tube having air permeability to the extent that carbon dioxide can be supplied to plants such as vegetables and fruit trees is obtained. it can.

(Heat seal layer)
A heat seal layer 11d may be provided on the surface of the innermost layer facing the second film 12 in order to form a pair of side joints 13 by heat fusion with the second film 12. Examples of the heat seal layer 11d include a layer made of the same resin as the bonding surface of the second film 12, such as a polyolefin resin. As will be described later, it is preferable to use a layer made of a polyolefin resin having a mesh structure so as to have air permeability sufficient to supply carbon dioxide gas to plants such as vegetables and fruit trees. The mesh structure is a breathable resin sheet obtained by thermally laminating polyolefinene fibers made of stretched polyolefin resin in the vertical and horizontal directions, and examples thereof include a burif and a non-woven fabric.

(Other embodiments of the first film)
FIG. 8 is a schematic cross-sectional view showing another embodiment of the first film 110 having a multilayer structure. The first film 11 is a laminated film in which a light reflecting layer 110a made of a porous thermoplastic resin, a reinforcing resin layer 11c, and a heat seal layer 11d are laminated in this order. The light reflection layer 110a made of a porous thermoplastic resin formed by stretching a resin composition containing a thermoplastic resin and a filler is a light reflection layer having both light reflection performance and gas permeability. Specifically, the first film 110 has gas permeability because it has fine voids, and is similar to the ink layer formed by including the pigment due to the irregularities on the surface of the layer and the empty walls in the layer. It also has light reflection performance. If it is the 1st film 110 of embodiment of FIG. 8, compared with the 1st film 11 of embodiment of FIG. 5, since a layer structure can be reduced, productivity is high.

  In the case of the first film 110 of the embodiment of FIG. 8, the total film thickness of the first film 110 is preferably 30 μm or more. When the film thickness of the 1st film 110 is 30 micrometers or more, it can be set as the light reflection layer 110a which has sufficient reflection performance. The light reflection layer 110a of the first film 110 has a total light reflectance of 70% or more at wavelengths of 500 nm, 600 nm, and 700 nm, similarly to the light reflection layer 11a of the first film 11 of the embodiment of FIG. , Preferably 80% or more, particularly preferably 90% or more. In addition, it is preferable that the film thickness of the 1st film 110 is 90 micrometers or less.

  The porous thermoplastic resin (light reflecting layer 1110a) used for the first film 110 of the embodiment of FIG. 8 is the porous thermoplastic resin used for the base film of the first film of the embodiment of FIG. A similarly formed porous thermoplastic resin can be used. A porous thermoplastic resin having an empty wall with an average diameter of 1 μm to 50 μm, a void ratio of 35% to 60%, and a thickness of 30 μm to 90 μm is preferable. The more preferable range is the same as that of the porous thermoplastic resin used for the base sheet of the first film in the embodiment of FIG.

[Second film]
The second film 12 is a film that is oriented with the first film 11. The second film 12 is not particularly limited as long as it can be joined to the first film 11 at both side portions in the longitudinal direction. For example, the resin similar to the thermoplastic resin of the base used for said sheet base material 11b can be mentioned. From the viewpoint of film formation ease and productivity, it is preferable to use a heat-sealable resin such as polyethylene and polypropylene. The thickness of the second film 12 is preferably 70 μm or more and 250 μm or less. The second film 12 may be a single layer or a multilayer. In addition, the light reflection layer may not be formed on the second film 12.

[Method of joining first film and second film]
In the agricultural tube 1, both side portions in the longitudinal direction of the first film 11 and the second film 12 are joined together to form a pair of side joined portions 13. As a bonding method, the first film 11 and the second film may be bonded to each other on both sides in the longitudinal direction of the first film and the second film via an adhesive layer formed of an adhesive such as hot melt. A method in which a part of 12 is fused may be used. As a method for fusing part of the first film and the second film, it is preferable from the viewpoint of productivity to use a sealing means by fusing such as heat sealing, high frequency sealing, ultrasonic sealing, and fusing sealing.

  The widths of the side joints 13 are each preferably 5 mm or more and 50 mm or less, and more preferably 10 mm or more and 30 mm or less. When the width of the side joint portion 13 is 5 mm or more, the first film and the second film can be firmly bonded. When the width of the side joint portion 13 is 50 mm or less, the inner diameter of the agricultural tube can be sufficiently secured.

  The first film 11 and the second film 12 may be films having the same shape and area, or may be films having different shapes and areas. In the case where the first film 11 and the second film 12 have different shapes and areas, for example, as in the modification of FIG. 7, the first film is a flat film and both sides of the second film are inward. It can be obtained by forming the side joints in a gusset-folded state (single gusset). The area ratio between the first film and the second film is not particularly limited, but for example, the area of the first film: the area of the second film is preferably in the range of 30:70 to 70:30. Due to the gusset folded shape, the agricultural tube can be easily spread, and the volume of gas that can be inserted can be increased. Moreover, the ratio of the reflective layer in the circumferential direction of the agricultural tube can be adjusted as appropriate.

<Another embodiment of an agricultural tube>
The agricultural tube 1a shown in FIG. 6 is different from that shown in FIG. 4 in that the side joints are formed in a cylindrical inward direction. As shown in FIG. 4, when the side joint portion is formed toward the outside of the tubular shape, the agricultural tube 1 has a shape protruding in a convex shape at the side joint portion 13. There is a risk of damaging the branches and trunks of plants such as vegetables and fruit trees. Since the side joint portion 13a is formed toward the inner side of the tube like the agricultural tube 1a in FIG. 6, there is no risk of damaging the branches or trunks of plants such as vegetables and fruit trees. It is a further preferred embodiment.

  Further, instead of using the laminated structure as shown in FIG. 5, the first film 11 and / or the second film 12 has an average diameter of 200 μm or more and 1200 μm or less in order to control the carbon dioxide permeability as described later. And the through-hole whose aperture ratio with respect to the surface area of the said agricultural tube is 3% or more and 10% or less may be formed.

<Examples of using agricultural tubes>
A preferred use example of the agricultural tube of the present invention will be described again with reference to FIGS. First, the one end side of the agricultural tube 1 of the present invention is sealed. For example, as shown in FIG. 2, the one-end-side joining portion 14 may be formed and sealed, may be sealed with a cap or the like, and may be sealed by binding one end. A plurality of agricultural tubes 1 may be connected as shown in FIG. In this case, one end side means one end side of the final stage agricultural tube 1 as shown in FIG. 1 (one end side joining portion 14 in this embodiment), and both ends are released in the other agricultural tube 1. Has been.

  Next, as shown in FIG. 1, it installs in the vicinity of the plant which grows the tube 1 for agriculture. And the gas from the gas cylinder 2 is inserted through the tube 4 from the other end side of the agricultural tube. By inserting gas into the agricultural tube, the inside of the agricultural tube is inflated (see FIG. 4). And the growth of a plant can be controlled by using the property of the gas inserted in the tube for agriculture. In addition, in this embodiment, although insertion by a gas cylinder is illustrated as a means to insert gas from the other end side of an agricultural tube, it is not limited to insertion by a gas cylinder. A method of blowing air may be used.

  At this time, the first film 11 is arranged vertically upward (upper surface side opposite to the placement surface), and the second film 12 is arranged vertically downward (lower surface side being the placement surface side). Thus, since the agricultural tube is installed, as shown in FIG. 2, the light hitting the first film 11 of the agricultural tube is reflected and irradiated to the plant. Thereby, the utilization efficiency of light can be improved and the quality of agricultural products and the production efficiency of agricultural products can be improved.

  For example, by inserting a gas heated from the gas cylinder 2 (for example, air of about 30 to 50 ° C.) while adjusting it with the electromagnetic valve 3, heat can be efficiently supplied to plants such as vegetables and fruit trees. Moreover, the usage example of an agricultural tube is not limited to the method of using a gas cylinder, For example, the aspect which connects a fan directly to a tube and blows warm air may be sufficient.

  Further, when the multilayer first film 11 having carbon dioxide permeability as described above is used, or when through holes are formed in the first film 11 and / or the second film 12, carbon dioxide gas is contained from the gas cylinder 2. A gas, preferably a gas containing carbon dioxide of 600 ppm or more and 1600 ppm or less can also be used. In this case, there is a merit that the light and carbon dioxide gas necessary for photosynthesis can be simultaneously supplied from the agricultural tube 1 by the single agricultural tube 1, which is a particularly preferable usage method.

DESCRIPTION OF SYMBOLS 1, 1a, 1b Agricultural tube 11, 110 1st film 11a, 110a Light reflection layer 11b Sheet base material 11c Reinforcement resin layer 11d Heat seal layer 12 2nd film 12a 2nd film 13 Side edge joining part 14 One end side joining part 2 Gas cylinder 3 Solenoid valve 4 General purpose tube

Claims (9)

The first film and the second film arranged to face each other are formed into a cylindrical shape,
It is an agricultural tube for gas insertion in which both sides in the longitudinal direction of the first film and the second film are joined to form a pair of side joints,
The agricultural film, wherein the first film includes a light reflecting layer.   The agricultural tube according to claim 1, wherein the side joint portion is fused.   The agricultural tube according to claim 1 or 2, wherein the second film is a polyolefin resin film.   The agricultural tube according to any one of claims 1 to 3, wherein the pair of side joints are formed toward the inside of the cylindrical shape. The first film has at least the light reflecting layer, a sheet base material, a reinforcing resin layer, and a heat seal layer laminated in this order,
The light reflection layer includes a resin component having a thickness of 0.5 μm or more and 4 μm or less and containing a pigment capable of reflecting light in the visible light region,
The sheet base material is a porous thermoplastic resin sheet having voids having an average diameter of 1 μm or more and 50 μm or less, a porosity of 35% or more and 60% or less, and a thickness of 30 μm or more and 90 μm or less,
The reinforcing resin layer is a resin layer having a thickness of 5 μm or more and 20 μm or less and containing an ethylene-vinyl acetate copolymer,
The agricultural tube according to any one of claims 1 to 4, wherein the heat seal layer is a polyolefin-based resin layer having a mesh structure. The first film has at least the light reflecting layer, the reinforcing resin layer, and the heat seal layer laminated in this order,
The light reflecting layer is a porous thermoplastic resin sheet having voids having an average diameter of 1 μm or more and 50 μm or less, a porosity of 35% or more and 60% or less, and a thickness of 30 μm or more and 90 μm or less.
The reinforcing resin layer is a resin layer having a thickness of 5 μm or more and 20 μm or less and containing an ethylene-vinyl acetate copolymer,
The agricultural tube according to any one of claims 1 to 4, wherein the heat seal layer is a polyolefin-based resin layer having a mesh structure.   The first film and / or the second film are formed with through-holes having an average diameter of 200 µm or more and 1200 µm or less and an opening ratio of 3% or more and 10% or less with respect to the surface area of the agricultural tube. To 4. The agricultural tube according to any one of 4 to 4. It installs in the vicinity of the plant to grow in the state which sealed one end side of the agricultural tube in any one of Claim 1 to 7, inserts gas from the other end side of the agricultural tube, and expands it in a cylinder shape. A plant growing method for controlling the growth of the plant using the gas property,
A plant growing method in which the agricultural tube is installed so that the first film is disposed vertically upward and the second film is disposed vertically downward.   The plant growing method according to claim 8, wherein a gas containing carbon dioxide of 400 ppm to 1600 ppm is used as the gas.

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