JP5986781B2 - Irrigation tube and manufacturing method thereof - Google Patents

Description

  The present invention relates to an irrigation tube used for irrigation and a method for producing the same.

When cultivating plants such as vegetables, fruits, and flowers, irrigation is sometimes performed using an irrigation tube in which holes (irrigation holes) are formed at regular intervals in order to save labor.
However, when water is supplied to the irrigation tube, especially when the water pressure is increased in order to spout water from the irrigation hole vigorously, the irrigation tube rotates vigorously in the circumferential direction, and the irrigation position shifts from the target position. There was a case.
Therefore, as a irrigation tube, a tube obtained by laminating a long film and welding inner surfaces facing each other at both end portions in the width direction along the longitudinal direction to form an ear portion has been proposed ( Patent Documents 1 and 2). In this irrigation tube, the rotation range is limited by the ear portion being in contact with the ground.

JP 2006-296310 A JP 2008-295309 A

However, the irrigation tubes described in Patent Documents 1 and 2 do not sufficiently fulfill the purpose of preventing the displacement of the irrigation position because the rotation is not sufficiently suppressed.
Then, an object of this invention is to provide the irrigation tube which can fully suppress the rotation of the circumferential direction at the time of water feeding, and its manufacturing method.

The present invention has the following aspects.
[1] A long and tubular water supply portion and a rotation restricting portion provided on an outer peripheral surface of the water supply portion, wherein the water supply portion has a plurality of irrigation holes formed along a longitudinal direction thereof, and the rotation The restricting portion is a single band-like body along the longitudinal direction of the water supply portion, and the angle θ between the irrigation hole, the center of the water supply portion and the rotation restricting portion when water is supplied (however, the water supply portion The irrigation tube is characterized in that the inner center is the apex of the corners) is 90 ° or more and less than 180 °.
[2] The method for producing an irrigation tube according to [1], wherein the inner surfaces are joined at one end in a width direction of the tube for processing and a tube forming step for forming the tube for processing by extrusion molding. And a perforating step of perforating a portion of the processing tube that is not joined at predetermined intervals along the longitudinal direction of the processing tube.

The irrigation tube of the present invention can sufficiently suppress circumferential rotation when water is supplied.
The irrigation tube production method of the present invention can easily produce an irrigation tube having the above-described effects.

It is a perspective view which shows one Embodiment of the tube for irrigation of this invention. It is sectional drawing which shows the aspect at the time of use of the irrigation tube of FIG.

<Watering tube>
One embodiment of the irrigation tube of the present invention will be described.
FIG. 1 shows the irrigation tube of this embodiment. The irrigation tube 1 of this embodiment includes a water supply unit 10 and a rotation regulating unit 20.

The water supply part 10 is long (for example, 1 m or more) and tubular. The water supply part 10 in this embodiment is comprised from the strip-shaped film 11 made from a thermoplastic resin, and the inside becomes a flow path of water, A plurality of irrigation holes H, H,. -Is formed.
In addition, the irrigation tube 1 according to the present embodiment is flat when water does not flow inside the water supply unit 10.
Width _{L 1} of the water supply unit 10 when the water is not water is preferably 40～70Mm. If the width L ₁ of the water supply unit 10 is more than the lower limit, it is possible to ensure the water supply amount of sufficient water, not more than the upper limit, the watering tube 1 can be easily disposed on the ground.
The thickness of the strip film 11 is preferably 100 to 300 μm. If the thickness of the belt-like film 11 is equal to or greater than the lower limit value, it is difficult to rupture even if the pressure of water supplied to the irrigation tube 1 is increased. If the thickness is equal to or less than the upper limit value, sufficient flexibility can be ensured.

  As a thermoplastic resin which comprises the water supply part 10, a branched low density polyethylene, a linear low density polyethylene, a polypropylene, a polyvinyl chloride etc. can be used, for example. Further, the belt-like film may contain a pigment, a dye, a plasticizer, a stabilizer, an antioxidant, a filler, and the like as necessary.

In the present embodiment, the irrigation holes H are formed in a zigzag manner at regular intervals along the longitudinal direction of the water supply unit 10.
It is preferable that the space | interval S in the longitudinal direction of the water supply part 10 of the irrigation hole H is 50-300 mm. If the interval S is equal to or greater than the lower limit value, water can be irrigated at an appropriate interval.
The diameter of the irrigation hole H is preferably 0.2 to 1.0 mm. If the hole diameter of the irrigation hole H is equal to or larger than the lower limit value, the irrigation amount can be easily increased.

The rotation restricting portion 20 is a single strip formed continuously along the longitudinal direction of the water supply portion 10, and one end in the width direction is connected to the outer surface of the water supply portion 10.
The width L ₂ of the rotation restricting portion 20 is preferably 7.0 to 40.0%, more preferably 10.0 to 30.0%, more preferably 15 to the width L ₁ of the water feeding portion 10. More preferably, it is 0.025.0%. If the width L ₂ of the rotation regulating portion 20 is more than the lower limit, upon water, to ensure the rotation restricting portion 20 can be grounded, The ground of the ground portion and the rotation restricting portion 20 of the water supply unit 10 Since a sufficient distance from the portion can be secured, rotation of the irrigation tube 1 can be further prevented. However, the rotation preventing effect when the width L ₂ greater than the upper limit to become a plateau, becomes wasteful.

In the cross section perpendicular to the longitudinal direction of the irrigation tube 1 during water supply (see FIG. 2), the angle θ between the irrigation hole H, the center C inside the water supply unit 10 and the rotation restricting unit 20 is 90. More than 180 degree and less than 180 degree, it is preferable that it is 120-140 degree. However, in the angle θ, the center C inside the water supply unit 10 is the apex of the corner, and one line constituting the corner is a line connecting the center of the irrigation hole H and the center C inside the water supply unit 10. The other line is a line connecting the center C inside the water supply unit 10 and the end of the rotation regulating unit 20 on the water supply unit 10 side.
Even if the angle θ is less than the lower limit value or greater than the upper limit value, the effect of suppressing the rotation becomes insufficient. In addition, when the angle θ is in the above range, the watering effect is enhanced because the irrigation hole H faces upward when water is supplied.

<Manufacturing method of irrigation tube>
(First manufacturing method)
The irrigation tube 1 can be manufactured by, for example, a first manufacturing method including a tube forming process, a joining process, and a drilling process.
The tube forming step is a step of forming a processing tube by extrusion molding. Specifically, in the tube forming step, a processing tube is obtained by using an extruder equipped with an annular die, melting the raw material resin with the extruder, and discharging the resin from the annular die.

The joining step in the first manufacturing method is a step of joining the inner surfaces at one end in the width direction of the processing tube. Specifically, in the joining step, the processing tube is folded into a band shape, and in the band shape, one end in the width direction is sandwiched between heated heat seal rolls along the longitudinal direction. Thereby, the inner surfaces which oppose are continuously heat-welded and joined. The joining portion in this joining becomes the rotation restricting portion 20.
The temperature and pressure of heat sealing are appropriately determined depending on the material and thickness of the processing tube, the heat sealing speed, and the like.

The perforating step in the first manufacturing method is a step of perforating unjoined portions of the processing tube (hereinafter referred to as “non-joined portions”) at predetermined intervals along the longitudinal direction of the processing tube. .
Specifically, in the perforating step, the inside of the processing tube is expanded, and the surface of the non-joined portion is perforated by irradiating the surface of the non-joined portion at a predetermined interval along the longitudinal direction of the processing tube. The water supply part 10 is obtained by this perforation.
When expanding the inside, a suction machine is arranged above and below the processing tube, and the upper and lower parts of the processing tube are sucked by the suction machine.
In the suction of the processing tube, it is preferable that the internal interval is 3 to 5 mm. If the internal spacing is equal to or greater than the lower limit, it is possible to prevent penetration from one surface of the processing tube to the other surface during drilling. However, it may be difficult to perform suction so that the internal interval exceeds the upper limit.
The intensity of the laser beam at the time of drilling is preferably 12 to ²⁰ W / cm ² . If the intensity of the laser beam is equal to or higher than the lower limit value, it can be easily drilled, and if it is equal to or lower than the upper limit value, the predetermined hole diameter can be easily set.

(Second manufacturing method, third manufacturing method)
In addition, the irrigation tube 1 has a second manufacturing method having a perforation step after the joining step for tubularly forming the strip-shaped film, or a joining step for tubular-forming the strip-shaped film after the perforating step for perforating the strip-shaped film. It can also be manufactured by the third manufacturing method.

In the joining step in the second manufacturing method, the belt-like film is continuously folded at the center in the width direction using a film folding machine while moving the belt-like film along its longitudinal direction. Thereby, one edge part and the other edge part of the width direction of a strip | belt-shaped film are piled up. In the present invention, “the center in the width direction” means not only the position in which the length in the width direction is equally divided into two but also 10 in the length in the width direction from the position in which the length is equally divided into two. Includes positions in the range of%.
Next, the end portions of the folded belt-like film are overlapped with each other, and the overlapped portions are sandwiched between heated heat seal rolls so as to be continuously heat-welded and joined to form a tube for processing. The joining portion in this joining becomes the rotation restricting portion 20. Here, the “tubularization” does not have to be a circular tube.
The punching process in the second manufacturing method is the same as the drilling process in the first manufacturing method.

In the punching step in the third manufacturing method, the surface of the belt-like film is irradiated with laser light while moving the belt-like film along the longitudinal direction, and the belt is punched at a predetermined interval along the longitudinal direction of the belt-like film. The intensity of the laser beam at that time is the same as that of the first manufacturing method.
In the joining step in the third manufacturing method, the belt-like film after perforation is continuously folded at the center in the width direction of the belt-like film using a film folding machine while moving along the longitudinal direction. Thereby, one edge part and the other edge part of the width direction of a strip | belt-shaped film are piled up. Next, with these end portions overlapped, the overlapped portions are sandwiched between heated heat seal rolls, so that they are continuously heat-welded, joined, and formed into a tube. The water supply part 10 is formed by this joining, and the joined part becomes the rotation restricting part 20.

<Usage method and effect of irrigation tube>
The irrigation tube 1 is used as follows.
That is, first, the irrigation tube 1 is laid in a predetermined arrangement in the field, and one end portion in the longitudinal direction of the irrigation tube 1 is connected to a tap and the other end portion is sealed. Then, open the tap and send water. As a result, water is caused to flow through the water supply section 10 and water W is ejected from the irrigation holes H as shown in FIG.
Since the irrigation hole H of the irrigation tube 1 is formed at the predetermined angle with respect to the single band-shaped rotation restricting portion 20, the rotation restricting portion 20 is pressed against the ground G when water is supplied, The rotation of the irrigation tube 1 is restricted. Therefore, rotation of the irrigation tube 1 in the circumferential direction can be prevented, and deviation of the irrigation position from the target position can be sufficiently prevented.

<Other embodiments>
In addition, this invention is not limited to the said embodiment. For example, the irrigation holes may not be formed in a zigzag shape, and may be formed at the same position in the longitudinal direction. In that case, the holes may be arranged in a single row or in a plurality of rows. Further, the interval in the longitudinal direction need not be a constant interval, and may be an indefinite interval.
The rotation restricting portion in the present invention may be formed intermittently in the longitudinal direction of the water supply portion.
In the perforating step when manufacturing the irrigation tube, the laser beam is used for perforation. However, the perforation pin may be inserted into the processing tube or the belt-like film for perforation.

  Moreover, the irrigation tube of the present invention can be manufactured by a method other than the first to third manufacturing methods. For example, the irrigation tube of the present invention can be produced by discharging a molten thermoplastic resin from a die having a hole corresponding to the cross section of the irrigation tube of the present invention using an extruder.

DESCRIPTION OF SYMBOLS 1 Tube for irrigation 10 Water supply part 11 Band-shaped film 20 Rotation restriction part H Watering hole G Ground W Water

Claims (2)

A long and tubular water supply part, and a rotation restricting part provided on the outer peripheral surface of the water supply part,
The water supply part is formed with a plurality of irrigation holes along its longitudinal direction, and the rotation restricting part is a single band-like body along the longitudinal direction of the water supply part,
The angle θ between the irrigation hole, the center of the water supply section, and the rotation restricting section when water is supplied (however, the center of the water supply section is the apex of the angle) is 90 ° or more and less than 180 °. An irrigation tube. It is a manufacturing method of the tube for irrigation of Claim 1, Comprising:
A tube forming step for forming a processing tube by extrusion molding, a joining step for joining the inner surfaces of the processing tube at one end in the width direction, and an unjoined portion of the processing tube for the processing And a perforating step of perforating at a predetermined interval along the longitudinal direction of the tube.

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