JPS5842006Y2 - irrigation tube - Google Patents

Description

[Detailed description of the invention] The present invention involves melt-sealing and polymerizing the long side ends of two long thermoplastic films with irrigation holes perforated on one side, and forming a long sheet in a cylindrical body. This invention relates to an irrigation tube equipped with a sip material.

This type of irrigation tube that has been proposed in the past, as shown in a longitudinal cross-sectional view in FIG. are melt-sealed and polymerized at both ends of their long sides 4.4'L, and both ends of their long sides are melt-sealed and polymerized 4.4'L.
They are bonded 6, 6' to the inner wall of the cylindrical body downwardly and upwardly from 4'.

It is also important and desirable to use such a irrigation tube in such a way that the sheet-like perforation material placed inside the cylindrical body is always drawn toward the long thermoplastic film in which the irrigation holes are formed. At the same time, the effective use area of the filter is increased by preventing it from coming into close contact with the film.

However, in reality, as shown in Fig. 2, which is a longitudinal cross-sectional view of the irrigation tube when it is in use, the non-perforated tube that has been bonded to the irrigation tube is A phenomenon is observed in which the perforation material is drawn toward the non-perforated film side in a state accompanying the expansion and deformation of the film into a cylindrical body.

3A and 3B are longitudinal sectional views taken along lines I--■ and II--II in FIG. 2, respectively, and represent such a state.

In order for the filter to perform its function of collecting dust and allowing water to pass through, it is desirable that the water passage resistance be as small as possible, and therefore, it is desirable that the entire surface of the filtration material be effectively used as a filter.

However, depending on the mode of use, the perforation material may be drawn toward the non-perforated film side, resulting in the following inconvenience.

That is, when connecting the irrigation tube to the connection pipe 7 of the water supply port, or when connecting the irrigation tubes to each other, for example,
Connections may be made with connecting pipes 7' every 100 m.

In these cases, the built-in perforation material in the vicinity of the connecting tube is forcibly drawn toward the perforated film side due to the insertion of the connecting tube.

Therefore, the supplied water is once passed through the mouth at the section 8 in Fig. 2, and then again at the section 8'.
Dust will accumulate in the 8°8' area.

In the part 8, as the dust accumulates, it becomes difficult for water to pass through, so the sieve material is pressed against the perforated film.
The water flow path may gradually expand.

However, normally, the phenomenon in which the sieve material is pressed against the perforated film travels through the irrigation tube and reaches the 8' section, causing a blockage at the 8' section before the blockage is resolved, and the sieve material ends up being pushed toward the perforated film. remains attracted to the non-perforated film side,
Irrigation tubes are often difficult to use.

The present invention provides a irrigation tube in which the elongated sheet-like perforation material placed within the irrigation tube is never drawn toward the non-perforated film side during use.

Therefore, the present invention involves melt-sealing and polymerizing the long side ends of two long thermoplastic muilms with irrigation holes perforated on one side, and inserting a long sheet-like perforation material into the formed cylindrical body. In the installed irrigation tube, one end of the long side of the sheet-like perforation material is directed upwardly above one of the melt-sealed polymerized parts, and the other end is directed upwardly or downwardly above the other melt-sealed polymerized part, respectively. It involves a irrigation tube adhered to the inner wall of a perforated length of thermoplastic film.

FIG. 4 is a longitudinal cross-sectional view of one embodiment of the irrigation tube according to the present invention, in which the other end of the long side of the sheet-like perforation material is perforated upwardly and downwardly from the other melt-sealed polymerized part. A more preferred embodiment of the invention is shown, in which the plastic film is adhered to the inner wall.

That is, one end of the long side of the sheet-like sieve material 5 is adhered to the inner wall 9 of the perforated long thermoplastic film upwardly from one of the melt-sealed polymerized portions 4, and the other end of the sieve material is attached to the other side. It is also adhered to the inner wall 9 of the perforated film upwardly and downwardly from the melt-sealed polymerized portion 4'.

Since a nonwoven fabric or the like is generally used as the sheet-like opening material, the end portion thereof is generally bonded to the inner wall of the perforated long thermoplastic film by heat welding or the like.

In the tube of this embodiment, both ends of the long side of the sheet-like perforation material are adhered to the inner wall of the perforated long thermoplastic film in the opposite direction, so that an S-shaped cross section is formed when water is used. , the perforated material is never attracted to the non-perforated film side.

FIG. 5 is a longitudinal cross-sectional view of another embodiment of the irrigation tube according to the present invention, in which the other end of the long side of the sheet-like perforation material is perforated upwardly from the other melt-sealed overlapping part. It shows an embodiment in which the thermoplastic film is adhered to the inner wall.

That is, one end of the long side of the sheet-like sieve material 5 is adhered to the inner wall 9 of the perforated long thermoplastic film upwardly from one of the melt-sealed polymerized portions 4, and the other end of the sieve material is attached to the other side. It is also bonded upwardly to the inner wall 9 of the perforated film above the melt-sealed polymerized portion 4'.

In the irrigation tube of this embodiment, both ends of the long side of the sheet-like irrigation material are bonded upwardly above the melt-sealed polymerized part, so that the elasticity and rigidity of the sheet-like irrigation material are combined with the The perforated material is not extremely attracted to the perforated film side when water passes through it, nor is it extremely pulled to the non-perforated film side as a reaction, and it always maintains an appropriate position.

With the irrigation tube of the present invention constructed in this manner, filtration is performed evenly over the entire filtration material, and the filtration of dirt is not performed exclusively in the portion drawn to the non-perforated film side. In addition, since there is no particular increase in resistance when passing through the mouth, it is possible to completely prevent the phenomenon that water becomes difficult to come out after the connecting pipe or does not come out at all.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view of a conventionally proposed irrigation tube. Fig. 2 is a longitudinal sectional view of the device in use, and a of Fig. 3.
and b are lines I-I and II- in FIG. 2, respectively.
It is a longitudinal cross-sectional view taken along line II. FIG. 4 and FIG. 5 are both longitudinal sectional views of one embodiment of the irrigation tube according to the present invention. Note that these drawings are all shown in a used state. In these drawings, reference numeral 1 indicates an irrigation hole, 2 indicates a long thermoplastic film provided with the irrigation hole, 3 indicates a non-perforated continuous thermoplastic film, 4 indicates a melt-sealed polymerized portion, 5 indicates a sheet-like perforation material,
Reference numerals 6 designate the adhesion portions of both long ends of the perforated material to the inner wall 9 of the perforated long thermoplastic film.

Claims (1)

[Scope of utility model registration request] 1. Irrigation tube made by melt-sealing and polymerizing the long sides of two long thermoplastic films with irrigation holes perforated on one side, and installing a long sheet-like perforation material inside the formed cylindrical body. , one end of the long side of the sheet-like perforated material is perforated upwardly above one melt-sealed polymerized part, and the other end is perforated upwardly or downwardly above the other melt-sealed polymerized part, respectively. Irrigation tube glued to the inner wall of the film. 2. The irrigation tube according to claim 1, wherein the swath material is a nonwoven fabric. 3. The irrigation tube according to claim 2, wherein the perforation material is bonded to the inner wall of the perforated long thermoplastic film by thermal welding.