JP2013013355A - Watering tube - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a watering tube made of a film which is partly bonded to be tubular for preventing the section being bonded to the film from peeling.SOLUTION: The watering tube 1 includes a main pipe 10 having a water carrying passage 11 and a branch pipe 20 having a water supply passage 22, wherein one end of the water supply passage 22 is connected to the water carrying passage 11, and the other end of the water supply passage 22 opens toward outside. The main pipe 10 contains a film whose end sections are partly bonded to be tubular. The main pipe 10 has a main pipe joint section 93 bonding inter faces of the water carrying passage 11 of the main pipe 10.

Description

  The present invention relates to an irrigation tube for irrigating a plant.

  As a means of growing plants in irrigated agriculture, drip irrigation is performed in which irrigation is carried out drop by drop at a moderate rate so that irrigation of plants does not become excessive. As an irrigation tube for performing drip irrigation, for example, a water conveyance hose for conveying water for irrigation, openings provided in the water conveyance hose at predetermined intervals, a water supply hole for supplying water to a plant, and an opening and a water supply hole Some have been provided with a spreading hose extending between the two. This water carrying hose is formed by stacking and bonding the ends of one or two plastic films into a cylindrical shape. (For example, refer to Patent Document 1).

  In the irrigation tube formed by adhering films together in Patent Document 1, the opening of the water transport hose is composed of a non-adhesive portion at the end of the superimposed film, so that the water flowing in the water transport hose There is a problem that it is easily peeled off from a non-adhesive portion that becomes an opening under the influence of pressure.

Japanese Patent Publication No. 60-29306

  An object of the present invention is to solve the above-mentioned problems of the prior art, and in an irrigation tube comprising a film that is partially bonded to form a cylinder, it is intended to prevent peeling of the part to which the film is bonded. To do.

  In order to achieve the above object, an irrigation tube according to the present invention includes a main pipe having a water conveyance path and a branch pipe having a water supply path, and one end of the water supply path is connected to the water conveyance path. An irrigation tube having an end that opens to the outside, the main pipe including a film in which the end is partially bonded and formed into a cylindrical shape, and the main pipe is bonded to the inner surface of the main pipe on the water conveyance path side It has a part.

  Further, the shape of the main pipe joint may be convex in the water conveyance direction.

  The irrigation tube of the present invention has high durability against water pressure in the irrigation tube because the adhesive part of the film is difficult to peel off, and has a long life as an irrigation tube.

It is a perspective view of the irrigation tube concerning Embodiment 1 of the present invention. It is a top view of the irrigation tube concerning Embodiment 1 of the present invention. It is sectional drawing of the irrigation tube which concerns on Embodiment 1 of this invention. It is a figure which shows the example of the shape of the main pipe junction part of the irrigation tube which concerns on Embodiment 1 of this invention. It is a figure which shows the other example of the shape of the main pipe junction part of the irrigation tube which concerns on Embodiment 1 of this invention. It is a figure which shows the other example of the shape of the main pipe junction part of the irrigation tube which concerns on Embodiment 1 of this invention. It is a figure which shows the other example of the shape of the main pipe junction part of the irrigation tube which concerns on Embodiment 1 of this invention. It is a figure which shows the other example of the shape of the main pipe junction part of the irrigation tube which concerns on Embodiment 1 of this invention. It is a figure which shows the other example of the shape of the main pipe junction part of the irrigation tube which concerns on Embodiment 1 of this invention. It is a figure which shows the formation position of the main pipe junction part of the irrigation tube which concerns on Embodiment 1 of this invention. It is a figure which shows the formation position of the main pipe junction part of the irrigation tube which concerns on Embodiment 1 of this invention. It is a perspective view of the irrigation tube which concerns on Embodiment 2 of this invention. It is a figure for demonstrating the manufacturing method of the irrigation tube which concerns on Embodiment 1 of this invention. It is a figure showing the evaluation method of the peeling tolerance of the irrigation tube which concerns on Embodiment 1 of this invention.

Hereinafter, embodiments of the present invention will be described in detail. However, the present invention is not limited to the following embodiments, and various modifications can be made within the spirit of the present invention.
In this specification and the like, “water” is used as a concept including not only pure water but also water containing fertilizers and agricultural chemicals.

(Irrigation tube)
The irrigation tube according to Embodiment 1 of the present invention includes a main pipe having a water conveyance path and a branch pipe having a water supply path, one end of the water supply path is connected to the water conveyance path, and the other end of the water supply path is outside. An irrigation tube that opens toward the main body, and the main pipe is made of a film having a partially bonded end, and the main pipe has a main pipe joint in which inner surfaces of the main pipe on the water conveyance path side are bonded to each other. It is. FIG. 1 is a perspective view of the irrigation tube, and FIG. 2 is a top view of the irrigation tube. 2 is a cross-sectional view taken along the line AA in FIG. 2 (a cross-sectional view passing through the middle of the adjacent main pipe joints 93), and FIG. 3A is a cross-sectional view taken along the line BB (passing through the water supply passage 22). FIG. 3B shows a cross-sectional view through line 93.

As shown in FIG. 1, the irrigation tube 1 is a tube in which a film is bonded by an adhesive portion 92. The main pipe 10 is a cylindrical part of the film, and the inner side of the main pipe 10 becomes the water conveyance path 11. The branch pipe 20 includes an adhesive portion 92 and a water supply path 22. The water conveyance direction F is the length direction of the irrigation tube 1. As shown in FIG. 2, a plurality of water supply paths 22 provided at predetermined intervals each have a water supply hole 23 that opens to the outside at one end, and a water conveyance path by a communication hole 21 at the other end. 11 is connected. The main pipe 10 has a plurality of main pipe joint portions 93 in which the inner surfaces of the water conveyance path 11 are bonded together.
The water flowing through the water conveyance path 11 of the main pipe 10 is discharged to the outside through the communication hole 21, the water supply path 22, and the water supply hole 23, and is given to the plants.

(Supervising)
The main tube 10 is a cylindrical portion in which the film end portions 41 are bonded together. The inner side of the main pipe 10 is a water conveyance path 11. The water conveyance path 11 is for conveying the water supplied from the water supply equipment to the end of the irrigation tube 1. The end of the irrigation tube 1 may be closed or open. In order to keep the water pressure in the water conveyance path 11 constant, it is preferably closed. As a method for blocking, an appropriate means such as heat bonding or tying the end of the irrigation tube 1 may be selected.
The water conveyance path 11 has the main pipe junction part 93 with which the inner sides were adhere | attached. Therefore, the cross-sectional shape of the water conveyance path 11 when water is flowed is different between a cross section passing through the main pipe joint portion 93 and a portion where the main pipe joint portion 93 is not provided. For example, in the AA line passing through the middle of the adjacent main pipe joints 93 in FIG. 2, the water conveyance path 11 forms one elliptical cross section as shown in FIG. Moreover, in the BB line which passes along the water supply path 22 of FIG. 2 and passes along the main pipe junction part 93, as shown in FIG.3 (b), the water conveyance path 11 has an elliptical cross section on both sides of the main pipe junction part 93, respectively. Forming.

  As the film that becomes the main tube 10, various films such as paper, resin, and metal can be used. From the viewpoint of ease of processing into a cylindrical shape and ease of forming the main pipe joint, a film having a heat seal property, for example, a thermoplastic resin film such as a polyethylene (PE) film or an unstretched polypropylene (CPP) film is preferably used. be able to. Further, in order to improve the durability of the irrigation tube 1, a multilayer film in which a film excellent in weather resistance and pressure resistance, for example, a biaxially stretched nylon film is laminated so as to be outside the thermoplastic resin film is used. You can also. When this multilayer film is used, the piercing strength, tensile strength, and pressure resistance of the irrigation tube can be improved by functioning as a reinforcing film.

(Main pipe joint)
The main pipe joint portion 93 is a portion where the inner surfaces of the water conveyance path 11 are bonded to each other. The main pipe joint portion 93 reduces the pressure applied to the adhesive portion 92 to which the end portion 41 of the film is bonded, as compared with the case where the cross-sectional shape is circular, by making the cross-sectional shape of the water conveyance path 11 elliptical. Thus, the bonding portion 92 is difficult to peel off from the water conveyance path 11 side.
In the cross-sectional shape of the water conveyance path 11, the diameter passing through the bonding portion 92 is longer than the diameter orthogonal to the diameter. For this reason, the angle formed by the two films bonded by the bonding portion 92 is smaller than in the case of a circular cross section, and works in the direction of peeling off the bonding portion 92 applied to the bonding portion 92 on the water conveyance path 11 side. Since the force is also small, the bonding portion 92 is difficult to peel off.

The shape of the main pipe joint portion 93 may be any shape such as a circle, a triangle, and a quadrangle.
In particular, a rhombus shape that is convex in the water conveyance direction F shown in FIG. 4 is desirable so that the main pipe joint portion 93 does not peel off due to the pressure of water in the water conveyance path 11.
Moreover, the elliptical main pipe joint 94 shown in FIG. 5 is desirable even if it has a convex shape in the same water transport direction F so that water pressure does not concentrate on the sharp tip.
Furthermore, as shown in FIG. 6, if the main pipe joint portion 95 has a linear shape over the entire length of the irrigation tube, the main pipe joint portion 95 is unlikely to peel off due to water pressure. Further, in order to connect the water conveyance path divided into the upper water conveyance path 111 and the lower water conveyance path 112 in the figure and pass water, the water is supplied from the lower water conveyance path 112 to the upper water conveyance path 111. In addition, non-forming portions 96 in which the straight main pipe joint portions 95 are not formed may be provided at regular intervals. By adjusting the interval at which the non-forming portion 96 is formed, water can be transported to the far side of the water supply facility due to the pressure difference between the upper water transport passage 111 and the lower water transport passage 112, and the water supply facility It is possible to provide an irrigation tube capable of bringing the number of water droplets from the water supply hole per unit time in the distance of the water close to the number of water droplets per unit time in the vicinity of the water supply equipment.
If the shape of the main pipe joint is symmetrical in the left-right direction in the figure, it can be used regardless of which direction the water supply equipment is connected without worrying about the water transport direction.
Moreover, as shown in FIG. 7, by providing the main pipe joint part 97 in the vicinity of the water supply channel 22, the angle formed by the two films in the adhesive part 92 can be reduced, and peeling can be effectively prevented. .
Further, as shown in FIG. 8, in order to reduce the angle formed by the two films in the bonding portion 92, main pipe joint portions 98 are provided on both front and rear sides in the water conveyance direction F of the communication hole 21 that is the entrance of the water supply passage 22. In order to prevent meandering and warping of the irrigation tube, it may be provided at both ends of the water conveyance path 11 in the direction intersecting with the water conveyance direction F (upper and lower ends in the drawing). When the diameter of the irrigation tube is large, a plurality of main pipe joints 99 may be provided in the water conveyance path 11 over the direction intersecting the water conveyance direction F as shown in FIG.

  The position in the direction parallel to the water conveyance direction F in which the main pipe joint portion 93 is provided may be provided in the middle of the adjacent water supply paths 22 as shown in FIG. 10 (a), and as shown in FIG. 10 (b), A surface perpendicular to the water conveyance direction F may be provided so as to overlap with a surface passing through the water supply path 22, and may be intermediate between them. In particular, by providing the main pipe joint portion 93 so that the surface perpendicular to the water conveyance direction F overlaps the surface passing through the water supply path 22, the angle formed by the two films in the communication hole 21 can be reduced. 92 can be made difficult to occur.

  Further, the position in the direction perpendicular to the water conveyance direction in which the main pipe joint portion 93 is provided may be a position in contact with the side surface of the water conveyance path 11 facing the adhesive portion 92 as shown in FIG. 11 (a). The center part of the water conveyance path 11 may be sufficient as shown in FIG. 11, and the position which contact | connects the water conveyance path 11 side by the side of the adhesion part 92 as shown in FIG.11 (c) may be sufficient. In particular, by providing the main pipe joint portion 93 at a position in contact with the side of the water conveyance path 11 on the adhesive portion 92 side, the angle formed by the two films in the adhesive portion 22 can be reduced, and the adhesive portion 92 is peeled off. Can be difficult.

(Branch)
As shown in FIG. 2, the branch pipe 20 includes an adhesive portion 92 and a water supply path 22. Each of the plurality of water supply paths 22 provided with a predetermined interval has a water supply hole 23 that opens toward the outside at one end, and is connected to the water conveyance path 11 through the communication hole 21 at the other end.

  The adhesion part 92 is a part where the films are overlapped and adhered, and the films may be directly adhered by heat sealing or the like, or may be adhered via an adhesive or an adhesive sheet. Furthermore, the adhesive force of the adhesive part 92 may be increased to make it difficult to peel off by increasing the adhesive area by embossing unevenness in a state where the films of the adhesive part 92 overlap each other. The magnitude | size of the adhesion part 92 is decided according to the length and formation space | interval of the water supply path 22, and should just be a grade which does not generate | occur | produce peeling of a film.

  The water supply path 22 is a portion where the films are overlapped and are included in the branch pipe 20 and are not bonded to each other. The shape, length, diameter, and formation interval of the water supply channel 22 may be appropriately determined from the viscosity of water, the number of infusions per unit time, the length of the irrigation tube, the water pressure, and the like, and the water flowing in the water supply channel 22 As long as it is not boring. In addition, since there exists a possibility that blocking may generate | occur | produce in the water supply path 22 which consists only of the films which are not bonded but overlapped, you may shape the film of the part of the water supply path 22 in a convex shape or a concave shape beforehand. Moreover, you may shape at the time of heat sealing.

(Modification)
Although the irrigation tube 1 which concerns on Embodiment 1 was formed by assembling one film in a cylinder shape, as shown in FIG. 12, producing an irrigation tube using two or more film materials May be. When one main pipe 10 is formed using a plurality of film materials, two branch pipes 20 are formed with two film materials, and three branch pipes 20 are formed with three film materials. In this case, the same number of branch pipes 20 as the number of film materials to be used are formed, and the number of water supply paths 22 can be adjusted according to the number of film materials to be used. In FIG. 12, the same elements as those in FIG. 1 are denoted by the same reference numerals.

As another modification, for the purpose of preventing clogging of the irrigation tube, a part or all of the irrigation tube may have a light-shielding property in order to suppress the generation and propagation of the algae and microorganisms that cause it. In that case, it is preferable to use black that can block light of many wavelengths. In order to make the irrigation tube black, a light shielding material such as carbon black or aluminum powder may be mixed in the film, or the film may be coated with an ink containing these. Furthermore, a film containing carbon black may be laminated, or a metal vapor deposition film such as aluminum may be formed on the film.
Moreover, in order to prevent clogging, you may provide a foreign material removal filter in the water intake hole of an irrigation tube. What is necessary is just to select a filter suitably from the filter which can remove a foreign material physically, such as paper, a nonwoven fabric, and a foam.
Furthermore, in order to prevent contamination and prevent clogging, the inner surface or outer surface of the irrigation tube is subjected to a super-water-repellent treatment with a fluoroalkyl group, an oil-repellent treatment with a fluororesin, and a super-hydrophilic treatment with titanium oxide. This can prevent the occurrence of mold.

(Manufacturing method of irrigation tube)
Next, the manufacturing method of the irrigation tube 1 which concerns on Embodiment 1 of this invention is demonstrated based on FIG. The irrigation tube 1 is composed of a single film 40 as shown in FIG. 13 (a). The film 40 is assembled into a cylindrical shape, and a pair of end edges 41 are opposed to each other as shown in FIG. 13 (b). The irrigation tube 1 as shown in FIG.13 (c) can be manufactured by heat-sealing the surfaces to perform with the heater from the outer side of the film 40. FIG.
When the film 40 is heat-sealed, only the portion that becomes the bonding portion 92 is overheated, and the portion that becomes the water supply passage 22 is not heated so that the water supply passage 22 can be formed.
Alternatively, a mold that has been processed into the shape of the water supply path 22 in advance is prepared, the mold 40 is sandwiched, the film 40 is heat-sealed, and then the mold is removed to form the water supply path 22.
Next, the inner surfaces of the water conveyance path 11 of the main pipe 10 facing each other are melted and bonded from the outside of the film 40 with a heater to form the main pipe joint portion 93. Thereby, the irrigation tube 1 in which the main pipe junction part 93 as shown in FIG. 1 is formed can be manufactured.

(How to use irrigation tube)
The irrigation tube 1 is connected to a facility for supplying water using one of the main pipes 10 as a water supply hole. The end of the main pipe opposite to the water supply hole may be closed or opened depending on the amount of water to be conveyed.
When water supply is started from the water supply facility, the water supplied to the water conveyance path 11 of the main pipe 10 flows through the communication hole 21 to the water supply path 22 of the branch pipe 20 and is discharged to the outside from the water supply hole 23. The amount of discharged water may be adjusted by adjusting the amount of water supplied from the water supply facility, or may be adjusted by closing the end of the main pipe opposite to the water supply facility.
When installing an irrigation tube, it is preferable not to contact the water supply hole 23 with soil or a plant. This is because mold and bacteria may enter the water supply channel 22 and the main pipe 10 when they come into contact with soil and plants and clog the pipe.

(Evaluation of peeling resistance of irrigation tube)
Such an irrigation tube 1 according to Embodiment 1 of the present invention was evaluated for the bonding portion 92 of the irrigation tube 1 by the following method.
Evaluation was performed using air instead of water. Evaluation is performed by feeding air from a compressor installed outside and feeding air into the evaluation sample at a specified pressure using a regulator (filter regulator FR-150, manufactured by Koganei Co., Ltd.), and observing the degree of peeling of the adhesive portion 92 with a microscope. Went. The degree of peeling was evaluated by measuring the retracted dimension of the adhesive portion 92 under a microscope.

(Evaluation sample)
The evaluation sample prepared the thing without the main pipe junction part 100 shown to Fig.14 (a), and the thing with the main pipe junction part 100 shown in FIG.14 (b). The length of the water conveyance path 11 is 100 mm, and the width is 25.7 mm. An adhesive portion 92 is also provided on the side opposite to the air supply side, so that the air pressure in the evaluation sample can maintain the applied pressure. Moreover, the sealing width of the adhesion part 92 of an observation location is 10 mm, and it is formed by heat sealing by heat sealing. Further, the main pipe joint is formed by heat sealing by heat sealing, and has a rectangular shape of 8 mm in length and 12 mm in width as shown in FIG. The formation position of the main pipe joint portion 100 was set so that a position 40 mm from the inlet for supplying air was the close end of the main pipe joint portion 100.
The evaluation of the sample was performed by measuring the length of the seal receding portion of the bonding portion 92 using two evaluation samples with and without the main pipe joint 100. The evaluation point was fixed at the same position so that both samples could be compared.
The layer structure of the film used for the evaluation sample is a three-layer structure of PET (polyethylene terephthalate) 12μ, ONY (biaxially stretched nylon) 15μ, and LLDPE (linear low density polyethylene) 150μ. The inner wall on the side is LLDPE and the outer wall is PET.

(Air pressure and pressurization time)
The air pressure was pressurized for two times of 60 minutes and 120 minutes using two kinds of pressures of 0.1 MPa and 0.2 MPa.

(Evaluation results)
Table 1 shows the evaluation results of the air pressure of 0.1 MPa, and Table 2 shows the evaluation results of the air pressure of 0.2 MPa.

  From Table 1 and Table 2, those having the main pipe joint 100 are bonded parts compared to those having no main pipe joint 100 at 60 minutes and 120 minutes at both 0.1 MPa and 0.2 MPa. No 92 retreats were observed, or even when observed, the length was short.

DESCRIPTION OF SYMBOLS 1 Irrigation tube 10 Main pipe 11 Water conveyance path 111 Upper water conveyance path 112 Lower water conveyance path 20 Branch pipe 21 Communication hole 22 Water supply path 23 Water supply hole 40 Film 41 End part 92 Adhesion part 93,94,95,97,98,99 , 100 Main pipe joint 96 Non-formed part

Claims (2)

A irrigation tube comprising a main pipe having a water conveyance path and a branch pipe having a water supply path, wherein one end of the water supply path is connected to the water conveyance path, and the other end of the water supply path opens toward the outside. ,
The main pipe includes a film in which end portions are partially bonded to form a cylinder, and the main pipe has a main pipe joint portion in which inner surfaces of the main pipe on the water conveyance path side are bonded to each other. .   The irrigation tube according to claim 1, wherein the shape of the main pipe joint is convex in the water conveyance direction.

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