JP2013047542A - Watering tube - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent detachment of a bonded part of a film due to inner pressure, in a watering tube in which the film is partially bonded to each other and formed in a tubular shape.SOLUTION: The watering tube 1 includes a main tube 10 with a water conveyance path and a branch tube 20 with a water supplying path 22. One end of the water supplying path 22 is connected to the water conveyance path, while the other end the water supplying path 22 is opened toward the outside of the watering tube 1. The main tube 10 includes the film formed into a tubular shape, a sealing part and a main tube connection part 93. The sealing part is formed by bonding an area where one surface and the other surface of the film face each other, and has at least one film end of the film on a side of the water conveyance path. The film end of the sealing part forms a stepped part with the film of an inner surface of the main tube 10. The main tube connection part is formed by bonding a part including one side and the other side of the stepped part to the inner surface of the main tube 10 facing the film end.

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 conveyance hose is formed by superposing and bonding the ends of one or two plastic films into a cylindrical shape (see, for example, 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 the non-adhesive portion of the end surface portion of the superimposed film. There is a problem that it is affected and easily peeled off.

Japanese Examined Patent Publication No. 62-55034

  The present invention solves the above-mentioned problems of the prior art, and in an irrigation tube composed of a film that is partially bonded and formed into a cylindrical shape, it is intended to prevent peeling due to internal pressure at the portion where the film is bonded. Objective.

  In order to achieve the above object, the irrigation tube according to the present invention is an irrigation tube comprising a main pipe having a water conveyance path and a branch pipe having a water supply path, wherein the water conveyance path is connected to one end of the water supply path, The other end of the water supply channel opens toward the outside of the irrigation tube, the main pipe includes a cylindrical film, has a seal portion and a main pipe joint portion, and the seal portion is one surface of the film. And the other surface are bonded to each other, and at least one film end of the film is on the water conveyance path side, and the film end of the seal portion forms a step with the film on the inner surface of the main pipe. The main pipe joint is a part in which a portion including one side and the other side of the step is bonded to the inner surface of the main pipe facing the film end.

Further, the shape of the main pipe joint portion may be a convex shape with respect to the upstream in the direction of transporting the water flowing through the water transport path.

  The irrigation tube of the present invention has high durability against the water pressure in the irrigation tube because the seal portion 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 explaining the structure of the main pipe 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 another 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 for demonstrating 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 perspective view of the irrigation tube which concerns on Embodiment 3 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 for demonstrating the manufacturing method of the irrigation tube which concerns on Embodiment 1 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 for demonstrating the manufacturing method 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 which concerns on Embodiment 1 of this invention is a irrigation tube provided with the main pipe which has a water conveyance path, and the branch pipe which has a water supply path, and the water conveyance path is connected with one end of the water supply path, and the other of the water supply path The end of the irrigation tube is open to the outside of the irrigation tube, the main pipe includes a cylindrical film, and has a seal portion and a main pipe joint portion. The seal portion is formed on one side and the other side of the film. Is the part where the areas facing each other are bonded, and has at least one film end of the film on the water conveyance path side, and the film end of the seal portion forms a step with the film on the inner surface of the main pipe, The portion is characterized in that a portion including one side and the other side of the step is bonded to the inner surface of the main pipe facing the film end.
Although the irrigation tube shown in the figure may have a length ranging from several tens of meters to several kilometers, only a part in the longitudinal direction is shown in the drawing.
FIG. 1 is a perspective view of the irrigation tube, and FIG. 2 is a top view of the irrigation tube of FIG. 2 is a cross-sectional view taken along the line AA (cross-sectional view passing through the water supply path 22) in FIG. 3A, and is a cross-sectional view along the BB line (passing through the main pipe joint portion 93) and between the adjacent water supply paths 22 FIG. 3 (b) shows a cross-sectional view taken through the line.

As shown in FIG. 1, the irrigation tube 1 according to Embodiment 1 of the present invention includes a main pipe 10 and a branch pipe 20 configured by attaching a branch pipe film 21 to the outside of the main pipe 10.
The main pipe 10 is a cylindrical portion of the film 40, and the inner side of the main pipe 10 becomes the water conveyance path 11. The direction F for transporting water in the water transport path 11 is the direction of the arrow in the figure.
As shown in FIG. 2, a plurality of water supply passages 22 formed between the branch pipe film 21 and the main pipe outer surface film 40 and provided at predetermined intervals are included in the branch pipe 20 and open to the outside. While having a water supply hole 23 at one end, the other end is connected to the water conveyance path 11 by a communication hole 13.
The water flowing through the water conveyance path 11 of the main pipe 10 is discharged to the outside through the communication hole 13, the water supply path 22, and the water supply hole 23, and is given to the plant.

(Supervising)
As shown in FIGS. 4A and 4B, the main pipe 10 is a cylindrical portion to which the end face portions 41 and 42 of the film 40 are bonded, and the inside of the main pipe 10 becomes the water conveyance path 11. The water conveyance path 11 is for conveying water supplied from a water supply device such as a water tap to the end of the irrigation tube 1. In addition, although the terminal of the irrigation tube 1 may be obstruct | occluded or may be open | released, in order to keep the water pressure in the water conveyance path 11 constant, it is preferable to obstruct | occlude. Appropriate means such as hot melt bonding (hereinafter referred to as “heat sealing”) or tying the end of the irrigation tube 1 may be selected as the means for closing.
As shown in FIG. 1, the water conveyance path 11 has a main pipe joint portion 93 where the inner sides of the water conveyance path 11 are bonded to each other at the film end 45. Therefore, the cross-sectional shape of the water conveyance path 11 at the time of flowing water differs in the cross section which passes along the main pipe junction part 93, and the part which does not provide the main pipe joint part 93 (FIG. 3 (a), (b)).
For example, in the AA line which passes along the water supply path 22 of FIG. 2, as shown to Fig.3 (a), the water conveyance path 11 forms one elliptical cross section. Moreover, in the BB line which passes along the main pipe junction part 93 located in the middle of the water supply path 22 of FIG. 2, as shown in FIG.3 (b), the water conveyance path 11 is an elliptical shape on both sides of the main pipe junction part 93, respectively. The cross section is formed.

  As the film 40 that becomes the main pipe 10, various films such as paper, resin, metal, and the like can be used. Due to the ease of processing into a cylindrical shape and the ease of forming the main pipe joint portion 93, a film having heat sealing properties, for example, a thermoplastic resin film such as a polyethylene (PE) film or an unstretched polypropylene (CPP) film is preferably used. can do. Further, in order to improve the durability of the irrigation tube 1, a film excellent in weather resistance and pressure resistance, for example, a multilayer film laminated so that a biaxially stretched nylon film is 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.

(Seal part)
As shown in FIGS. 4A and 4B, the seal portion 12 is formed by rounding the film 40 constituting the main pipe 10 into a cylindrical shape along the longitudinal direction (FIG. 4A) and overlapping the film 40. This is a portion where the end surface portion 41 of one surface is bonded to the end surface portion 42 of the other surface (FIG. 4B). Further, the seal portion 12 has one film end 45 of the film 40 on the water conveyance path side, and the other film end 44 on the outer side of the main pipe opposite to the water conveyance path side.
The seal portion 12 is formed by heat sealing in the first embodiment, but may be bonded using an adhesive or the like.

(Film edge)
As shown in FIGS. 4A and 4B, the film ends 44 and 45 are included in the seal portion 12, and are formed on one end surface portion 41 of the film 40 and the other end surface portion 42 of the other end surface portion 42. There are a film end 45 on the water conveyance path side and a film end 44 on the main pipe outer surface side.

(Step)
The step 50 is on the inner surface side (water conveyance path 11 side) of the main pipe 10 formed into a cylindrical shape by overlapping and bonding one surface and the other surface of the film 40 as shown in FIG. 4B. It is between the film end 45 and the inner surface side (water conveyance path 11 side) of the main pipe 10 of the film 40 which is overlapped and adhered to the film end 45. The size of the step 50 is the sum of the thickness of the film 40 and the thickness of the seal portion 12. The inner surface of the main pipe is separated from the film end 45 and the film 40 side of the inner surface of the main pipe with the step 50 as a boundary.
And the part which adhered the part of the inner surface of the main pipe containing one side and the other side of this level | step difference 50 to the inner surface of the main pipe which opposes the film end 45 becomes the main pipe junction part 93 mentioned later.

(Main pipe joint)
As shown in FIG. 1, the main pipe joint portion 93 includes one side and the other side of a step 50 formed between the film end 45 on the water conveyance path 11 side and the film 40 on the inner surface side of the main pipe 10. Is a portion bonded to the inner surface of the main pipe 10 facing the film end 45. The main pipe joint portion 93 adheres the film end 45 to the inner surface of the main pipe 10 facing each other, thereby relieving the shear stress applied to the seal portion 12 of the main pipe 10 swelled by water pressure, thereby making it difficult for the seal portion 12 to be peeled off. . Since the main pipe joint portion 93 is present, the seal portion 12 is not peeled before the main pipe joint portion 93, so that it can be said that the main pipe joint portion 93 prevents the seal portion 12 from being peeled off.
On the other hand, by providing the main pipe joints 93 at appropriate intervals so that the main pipe joints 93 are not too far apart, the shear stress is relieved even in places where the main pipe joints 93 are not provided. Peeling of the part 12 is prevented.

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 with respect to the upstream side in the direction F of conveying water shown in FIG. 5 is desirable so that the main pipe joint portion 93 does not peel off due to the water pressure in the water conveyance path 11.
Further, the elliptical main pipe joint portion 94 shown in FIG. 6 is more desirable even if it has a convex shape upstream of the direction F in which water is conveyed so that the water pressure does not concentrate on the sharp tip portion.
Further, as shown in FIG. 7, if the main pipe joint portion 95 is a linear main pipe joint 95 extending over the entire length of the irrigation tube, peeling of the main pipe joint portion 95 due to water pressure hardly occurs. Furthermore, 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 a location far away from the water supply device due to a pressure difference between the upper water transport path 111 and the lower water transport path 112. In addition, it is possible to provide an irrigation tube capable of bringing the number of water droplets from the water supply hole per unit time at a location far away from the water supply device close to the number of water droplets per unit time in the vicinity of the water supply device.
If the shape of the main pipe joints 93, 94, 95 is symmetrical in the left-right direction in the figure, the water supply device can be used in either direction without worrying about the direction in which the water is conveyed. it can.

As shown in FIG. 8A, the position of the main pipe joint portion 93 may be provided in the middle of the adjacent water supply passages 22 so as to overlap the surface passing through the water supply passages 22 as shown in FIG. 8B. Further, it may be provided at a position that is not in the middle of the water supply path 22 and does not overlap the water supply path 22.
If the main pipe joint portion 93 is provided in the middle of the adjacent water supply passages 22, the water pressure applied to the communication holes 13 is reduced, so that the amount of water supplied to the plant can be reduced, and conversely, it overlaps the surface passing through the water supply passages 22. If the main pipe joint portion 93 is provided, the water pressure applied to the communication hole 13 increases, and the amount of water supplied to the plant can be increased.
In addition, when peeling of the branch pipe film 21 becomes a problem, it is good to provide the main pipe junction part 93 in the middle of the adjacent water supply path 22 so that the water pressure concerning the communicating hole 13 may be decreased.

(Branch)
As shown in FIG. 2, the branch pipe 20 includes a branch pipe seal portion 24 bonded to the outside of the main pipe of the branch pipe film 21 and the film 40, a water supply path 22 that is a non-adhesive portion other than the branch pipe seal section 24, and one of the water supply paths. A water supply hole 23 connected to the end and opening to the outside is provided. A plurality of water supply holes 23 are provided in the branch pipe 20 at a predetermined interval, and water is supplied to the plants from the holes. The branch seal part 24 where the branch pipe film 21 and the film 40 are bonded is bonded by heat sealing, but may be bonded by an adhesive.
The magnitude | size of the branch pipe seal part 24 is decided according to the length and formation space | interval of the water supply path 22, and should just be a grade which peeling of the branch pipe film 21 does not generate | occur | produce.

  The water supply path 22 is a part where the film 40 and the branch pipe film 21 are overlapped and configured so that the films 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, in the water supply path 22 which consists only of the films which are not bonded but overlapped, blocking may occur, and water may not flow. Therefore, the film of the water supply path 22 is formed in a convex shape or a concave shape in advance. It may be formed at the same time, or may be formed simultaneously with heat sealing.

(Modification)
In the irrigation tube 1 according to the first embodiment, the branch pipe film 21 is bonded without covering the film end 44 of the seal portion 12. However, in another modified example as shown in FIG. 9, the branch pipe film 21 is sealed. You may adhere | attach so that the film end 44 of the part 12 may be covered. In this case, it is possible to prevent the peeling due to the shear stress applied to the seal portion 12 when the main pipe 10 is expanded by water pressure. In FIG. 9, the same elements as those in FIG. 1 are denoted by the same reference numerals.

  As another modification, the non-adhesive part excluding the seal part 12 and the seal part 12 is used as the water supply channel 22 without using the branch film 21 for the purpose of simply producing the irrigation tube, and the implementation shown in FIG. The branch pipe 20 may have the seal part 12, the water supply path 22, and the water supply hole 23 like the form 3. 10, the same elements as those in FIG. 1 are denoted by the same reference numerals.

(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 FIGS. 11-14. The irrigation tube 1 according to the first embodiment prepares one film 40 as shown in FIG. Next, a plurality of communication holes 13 are drilled in the film 40 at a predetermined interval (FIG. 11B).

  Subsequently, the film 40 is assembled into a cylindrical shape, and as shown in FIG. 12, one end surface portion 41 of the film 40 and the other end surface portion 42 are stacked and heat-sealed to form the seal portion 12. can do.

Next, the branch film 21 which comprises the branch pipe 20 of the irrigation tube 1 of Embodiment 1 is prepared, and this branch film 21 is piled up so that the outer surface and the communicating hole 13 of the main pipe 10 may be covered (FIG. 13).
Subsequently, the branch pipe film 21 is bonded to the film 40 on the outer surface of the main pipe 10 by heat sealing. When heat sealing, only the portion that becomes the branch seal portion 24 is heated, and the portion that becomes the water supply channel 22 is not heated. By doing so, the non-bonded portion of the branch pipe film 21 can form the water supply passage 22 and the water supply hole 23. In this case, each communication hole 13 of the main pipe 10 corresponds to one end of the water supply channel 23 (FIG. 14).
Alternatively, a mold that has been processed into the shape of the water supply path 22 in advance may be prepared, the branch film 21 may be heat sealed by sandwiching the mold, and then the mold may be removed to form the water supply path 22.

  Next, at the film end 45 of the seal portion 12 of the main pipe 10, the inner surfaces facing each other of the water conveyance path 11 are melted and bonded from the outside of the film 40 with a heater to form the main pipe joint portion 93. By doing so, it is possible to manufacture the irrigation tube 1 having the main pipe joint portion 93 as in the first embodiment shown in FIG.

(How to use irrigation tube)
The irrigation tube 1 is connected to a water supply device using one of the openings at the end of the main pipe 10 as a water inlet. The end of the main pipe opposite to the water inlet may be closed or opened depending on the amount of water to be conveyed.
When water supply is started from the water supply device, the water supplied to the water conveyance path 11 of the main pipe 10 flows through the communication hole 13 to the water supply path 22 of the branch pipe 20 and is discharged from the water supply hole 23 to the outside. The amount of discharged water may be adjusted by adjusting the amount of water supplied from the water supply device, or by adjusting the degree of closing of the end of the main pipe opposite to the water inlet.
Furthermore, when the main pipe joint portion 93 is provided, the water pressure in the liquid transport path 11 is increased, the amount of water discharged from the water supply hole 23 is increased, and there is a possibility that the branch film 21 may be peeled off due to the increase in water pressure. May take a method of adjusting the closing degree of the opening of the end of the main pipe opposite to the water inlet to make the amount of water discharged from the water supply hole 23 constant.
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.

1 Irrigation tube 10 Main pipe 11 Water conveyance path 111 Upper water conveyance path 112 Lower water conveyance path 12 Seal part 13 Communication hole 20 Branch pipe 21 Branch pipe 22 Water supply path 23 Water supply hole 24 Branch pipe seal part 40 Film 41, 42 End face part 44, 45 Film edge 50 Step 93, 94, 95 Main pipe joint 96 Non-formed part

Claims (2)

In an irrigation tube comprising a main pipe having a water conveyance path and a branch pipe having a water supply path,
The water conveyance path is connected to one end of the water supply path, and the other end of the water supply path is open toward the outside of the irrigation tube;
The main pipe includes a cylindrical film, has a seal portion and a main pipe joint portion,
The seal portion is a portion where a region where one surface and the other surface of the film face each other is bonded, and has at least one film end of the film on the water conveyance path side,
The film end of the seal part forms a step with the film on the inner surface of the main pipe,
The irrigation tube according to claim 1, wherein the main pipe joint is a part in which a part including one side and the other side of the step is adhered to an inner surface of the main pipe facing the film end.   2. The irrigation tube according to claim 1, wherein a shape of the main pipe joint portion is a convex shape with respect to an upstream of a direction in which water flowing through the water conveyance path is conveyed.

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