WO1991003155A1

WO1991003155A1 - Irrigation pipes and process and device for making them

Info

Publication number: WO1991003155A1
Application number: PCT/AT1990/000089
Authority: WO
Inventors: Alfred Van Der Meulen
Original assignee: Meulen Alfred V D
Priority date: 1989-09-08
Filing date: 1990-09-07
Publication date: 1991-03-21
Also published as: IL95589A0; AU6291690A; ZA907095B

Abstract

The invention relates to irrigation pipes and processes and devices for making them. Pipes for irrigating plants, especially their roots, with a substantially circular cross-section and apertures covered by a filter material applied to the outside of the pipe, in which the pipe (1) has longitudinal lips (10) whose opposite longitudinal sides form an intermediate space within which the apertures (3) lie and in which a filter strip (7, 11), for example of woven or mineral fibres or the like, is surrounded or held by the lips (10) or the apertures (3) are recessed in relation to the outer surface of the pipe (1) and are each covered by a piece (6) of filter material.

Description

Irrigation pipes and method and device for their manufacture

The invention relates to irrigation pipes for watering plants, in particular for root irrigation. Such tubes have an essentially circular cross section and are provided with through-openings, the through-openings being covered with filter material to regulate the water outlet and to prevent roots from growing in.

Irrigation pipes of this type are known in various forms. The object of the invention is to create a simply constructed and easy to manufacture tube that can be used in a reliable manner, i.e. can be damaged as little as possible during operation, the irrigation water can escape with a good dose and prevents roots from growing in.

This aim is achieved in a pipe for watering plants, in particular for root irrigation, with an essentially circular cross section and with at least one passage opening, the passage opening (s) being equipped with filter material, e.g. from tissue, mineral fibers or the like. are covered, which is located on the outside of the tube and is delimited on both sides by longitudinal lips, the opposite longitudinal sides of which delimit a space within which the through-openings are located, according to the invention achieved in that the lips extend from the outer surface of the tube at an acute angle this go towards each other and that the filter material formed by a filter belt and / or its support protrudes between the outer surface of the tube and the lips. The filter band covering the diaphragm opening is firmly held by the lips or welded or glued to them, secured against slipping and damage both during handling and in the ground, and enables the pipe to be manufactured very simply. The lips facing each other extend from a circumferential half of the tube and the area of the filter belt in the space between the lips in front of the through-openings is preferably thickened.

It can be provided that only the thickened area of the filter band located in front of the through-openings consists of filter material and the parts of the filter band protruding between the lips and the tube of possibly self-adhesive or stickable, in particular water-impermeable shark strips, for example made of plastic. are formed. - 2 -

Due to the thickening in the middle of the filter belt, a good filtering effect or dosing of the water is achieved at this point, while only cheap supporting foils or holding strips have to be arranged below the lips. In the same way, rectangular filter tapes can be used, which consist entirely of filter material. A method for producing this tube, which tube is extruded from an extruder and is provided in a subsequent station with passage openings, which are then advantageously covered with filter material when the tube moves in the longitudinal direction, is characterized in that the tube with molded lips ext ' is ruddered and that a filter belt is inserted between the lips and the tube, preferably simultaneously with the extrusion, as the filter material covering the through openings. The tube with the molded lips is thus quickly and easily extruded, in particular from thermoplastic material, and during the extrusion the passage openings are made and the filter band is inserted between the lips. It can be provided that the filter band is welded or glued to the tube and / or the lips during insertion or immediately afterwards. The area of the filter belt lying between the lips in front of the passage openings remains free; the lips are pressed against the lateral areas of the filter belt and, if necessary, glued or welded to the filter belt. The lips can be pivotably connected to the tube via thin webs. A device for the production of such pipes is characterized in that the ^τ extruder head has a shaped head for extruding pipes with molded lips, that the perforation device is followed by a feed or contact device for a band of filter material and that this device is a Device for pressing and / or welding or gluing the lips and / or the tube with the filter band is assigned or arranged downstream.

In a further embodiment of the invention, with which the objectives mentioned at the outset can be reached, a tube of the type mentioned at the outset is characterized in that the passage openings are arranged in a recessed manner relative to the outer surface of the tube and are each covered with a piece of filter material. It is also expedient if the through-openings in the bottom region of recesses, in particular circular-cylindrical recesses formed in the tube, for example by pressing lie and that the filter material pieces are adapted to the shape of the depressions and are inserted or inserted into them.

The recessed mounting of the through openings ensures that the filter material does not protrude or does not protrude too much beyond the outer surface of the tube and is therefore less exposed to damage. Moreover, it is not necessary to provide filter material over the entire length of the tube, but only locally in front of or around the passage openings.

The depressions can have different shapes. The cross-sectional shape of the depressions in plan view can be circular, elliptical, rectangular or the like. be, the cross section of the depressions perpendicular to the Rohrlangs¬ axis can be rectangular, trapezoidal, triangular or the like. his. In a corresponding manner, at least the inner surface or the surface of the filter material lying against the outer tube wall is adapted to the shape of the recess, so that a good contact is achieved.

The pieces of filter material, optionally provided with adhesive layers, are advantageously glued or welded to the outer tube wall or to the outer wall of the depression. The adhesive can already be attached to the filter material pieces and a connection can be made by pressing the filter material pieces against the pipe outer surface.

A method for producing this embodiment of a tube, which tube is extruded from an extruder and is provided in a subsequent station with passage openings, which are then advantageously covered with filter material when the tube moves in the longitudinal direction, is characterized according to the invention in that preferably at the same time as the passage openings are formed, the tube region lying around the passage openings is deepened and pieces of filter material covering or covering the passage openings are inserted or applied. It is particularly advantageous if the formation of the depression and the through-opening is carried out in one work step, for example by means of an appropriately shaped stamp. After the formation of the recess, the passage opening is then covered with a piece of filter material, it being possible in particular to deliver the pieces of filter material glued to a carrier tape, in particular glued on, and to remove the carrier tape after the filter material pieces have been attached to the pipe. With this procedure, pipe production can be carried out extremely quickly without fear of damage to the filter material on the finished pipe.

A device for carrying out this method is characterized in accordance with the invention in that the perforation device is assigned an attention for the formation of depressions in the tube around the passage openings, that the feed device for the filter material has a storage for arranged on a carrier tape Pieces of filter material include that a device for controlling the synchronism between the carrier tape and the pipe extruded from the extruder head is provided, that a pressing device for the pieces of filter material is provided on the pipe or the depressions formed in the pipe and that a take-off device for the carrier film is advantageously provided.

In a preferred embodiment of the invention it is provided that a further tube is arranged in the interior of the tube, which is connected via holes to the interior of the tube and into which the passage openings open. It is expedient if, with the formation of the passage openings, holes are also made to connect the interior of the further tube with the interior of the tube. I following the invention is explained in more detail with reference to the drawing. 1 and 2 filter tapes, Fig. 3, 3a and 4, different views of irrigation pipes according to a first embodiment, Fig.5 schematically shows a device for producing the pipes shown in the preceding figures, Fig. 6 and 7 pipes with Innenrohreπ 8, 9 and 10 schematically show the further embodiments of irrigation pipes, FIGS. 11, 12, 13 and 14 sections through irrigation pipes and FIG. 15 schematically shows a device for producing these irrigation pipes.

Fig. 3 shows a tube 1 which is formed with two mutually opposite lips 10. 5 shows, such a tube 1 can be formed with an extruder head 19 with a corresponding extruder insert. In the course of the extrusion process shown in FIG. 5 or the extrusion device shown schematically there, ¹ perforations 3 are formed in the tube 1 by means of a perforation device 4 with a suitable punch or mandrel 4. In a schematically indicated device 17, the filter tape 7 drawn off from a roller 23 is inserted between the lips 10, whereupon the lips 10, which are still flexible or have been made flexible again after further heating, Attention 9 bent or pressed against the tube, so that there is a tube, as shown in Fig. The lips 10 carried by webs or thinners 20 can be seen in particular in FIG. 3, which preferably terminate flatly with or protrude above the outer surface of the filter belt 7. It is preferred if the angle is less than 25, preferably less than 20, or if the curvature of the lips 10 essentially follows the tube circumference.

The filter belt shown in Fig. 1 consists e.g. from glass fiber fabric, mineral fibers, scrims, felt, etc; filter materials of this type are known to the person skilled in the art. Filter tapes can be used which have the same thickness over their width or have a thickening 11, in particular in the middle, as shown in FIGS. 1 and 2. Fig. 2 shows a filter belt which consists of filter material in the middle, while the edge parts 11 'e.g. consist of plastic material or are formed by adhesive tapes which are connected to the filter material 11 in the region 12. The edge regions 11 'can carry adhesive layers 22 or be designed to be weldable.

After the filter tapes 7 have been inserted between the lips 10 or through the passage openings 3, the device 10 presses the lips 10 onto the tube 1 and the filter tape 7 is welded to the lips 10 and / or the tube 1 or bonded by pressure.

Any extrudable plastics can be used as the material for the tube; thermoplastic is used in particular. The device shown in FIG. 5 for producing the tube comprises corresponding devices 23 for supplying the filter band 7, for pressing the lips 10 and for perforation 4, the creation of which is reasonable for the person skilled in the art. The finished pipe can be rolled up or, if it is manufactured as a bar, can be bundled and transported accordingly.

The shape of the passage openings 3 formed in the tubes or of the openings 31 mentioned later can be chosen as desired; Corresponding stamps 4 'on the perforation device 4 can be exchanged. It is also advantageous if a control device (not shown) is provided which coordinates the movement of the tube 1 from the extrusion head 19 and the movement of the supplied filter belt 7.

Such pipes resist ingrowth of the roots; the production costs of the facility and its operation are cheap or simple and the pipes produced can be connected to any other irrigation systems and irrigation systems via appropriate connections. The pipe described is particularly well suited for pressure-compensated irrigation systems. 6 and 7 show tubes 1 according to the invention, in the interior of which a further tube 30 has been arranged or co-extruded. For all types of pressure-compensated irrigation systems.

6 and 7 show tubes 1 according to the invention, in the interior of which a further tube 30 has been arranged or co-extruded. Enormous pressure losses occur in all of the irrigation pipes, particularly in the case of large pipe lengths. The longer the pipes are, the lower the water pressure and thus the amount of water outlet compared to the outlet at the beginning of the pipes.

In order to counteract this problem, the second pipe 30 with a relatively small diameter is integrated in the irrigation pipe 1. This pressure compensation tube 30 is integrated so that the water first flows in the irrigation tube 1 and then passes through outlet openings 31 into the compensation tube 30. Only from there can the water pass through the openings 3 into the filter belt 11 and then into the earth.

The hollow space in the compensation tube 30 acts as a thickening condenser and, due to the different ratio of the tubes of the tube 1.31 and the different ratio of the number of bores 3.31, as a vortex compensating means, and thus primarily compensating for the Longitudinal pressure loss »n in the tube 1. The holes 31 are produced simultaneously with the opening opening Tg 3 with the perforation device 4 or 4 '. However, only through openings 3 can be produced with the perforation device. It is advantageous to whom holes are formed in a predetermined alternation or sequence, or only passage openings, where appropriate at least part, preferably all, of which passage openings which have been produced at the same time are closed again. For closing formed through openings 3, a closure device 32 is provided, which e.g. by injecting plastic material or the like. closes. If it is intended that the passage openings 3 and the holes 31 are offset from one another, the flow resistance in the further pipe 30 (compensation pipe) is increased accordingly. 6, the reclosed passage openings are designated 3 '.

8 to 15, the production of further pipes according to the invention is described. The tube 1 extruded from the extrusion head 19 is perforated with a particularly heatable punch or mandrel 4 'of a perforation device 4 and with a punch 4 " ^■ * ^• Provide a depression 2. The punches 4 'and 4 "can be in one piece. Such a tube 1, provided with a passage opening 3 in a depression 2, is shown schematically in FIG. 8. This tube 1 can also, as already described 15 are provided with pieces of filter material which are delivered on a carrier tape 5 from a storage roll 18 to the depressions 2. By means of a schematically indicated pressing device 8, the can also be designed as a welding or gluing device, a connection or for holding the pieces 6 in or above the recess 2. The carrier tape 5 with the filter pieces 6 arranged thereon is shown in plan view in FIGS With a take-off device 16, in particular a take-off roller, the carrier tape 5 can be removed from the tube 1 or from the filter pieces 6 after their connection with the 5 pipe 1 are withdrawn.

It is advantageous if the filter pieces 6 already carry an appropriate adhesive, so that they e.g. can be glued by pressure to the tube 1 or in the recess 2.

In very general terms, the distances and / or diameters of the perforations 3 or of the openings 31 along the tubes 1 can be varied or adapted to the desired distances which have proven useful for irrigating various plant crops.

11 shows schematically in section a filter piece 6 in a depression 2, which is connected to the base area of the depression 2 at points 13 by gluing or welding. It is entirely possible to provide further welding or gluing points 13 or, except for the passage opening 3, to glue the filter material to the recess 2 over the entire surface.

12 shows an embodiment in which a filter material piece 6, which is triangular in section, is introduced into a recess 2, which is likewise triangular in section.

FIG. 13 shows a depression in which the tube wall is pressed in and a piece of filter material 6 corresponding to the shape of the depression is inserted. FIG. 14 shows a tube with a longitudinal groove 15, which connects the depressions 2, so that, if necessary, also of a filter material or carrier strip or the like. existing connection 14 connected Pieces of filter material 6 can be inserted into the depressions 2. This has the advantage that the filter pieces are attached to the carrier material 5 so that they are easier to manufacture and store. It is understood that the tubes 1 and 30 are formed with a correspondingly selectable wall thickness and can also have a cross-section deviating from a circular shape. The thickness and porosity of the filter material can also be freely selected. Furthermore, the recesses 2 in the tube 1 can also be formed after or before the openings 3 are made, or the openings 3 and 31 can also have different area dimensions.

Instead of closing bores, it can also be provided to drill certain holes, for example only every fourth hole deeper, that is, to drill through both tubes 1.31, and to drill the bores in between only through tube 1.

Claims

Patent claims:

1. Pipe for watering plants, in particular for root watering ⁵ , with a substantially circular cross section and with at least one passage opening (3), the passage opening (s) (3) with filter material, for example made of tissue, mineral fibers or the like. , are covered, which is located on the outside of the tube (1) and is delimited on both sides by longitudinally extending lips (10), their opposite longitudinal sides

* - ^Q delimit a space within which the passage openings (3) are located, characterized in that the lips (10) extend from the outer surface of the tube (1) at an acute angle ( ^c ) to one another and that the a filter band (.7, 11) formed filter material and / or its carrier between the outer surface of the tube

15 (i) and the lips (10) protrudes.

2. Pipe according to claim 1, characterized in that the angle ⁽ p_) is less than 25, preferably less than 20.

3. Pipe according to claim 1 or 2, characterized in that the 20 curvature of the lips (10) essentially follows the pipe circumference.

4. Pipe according to one of claims 1 to 3, characterized in that the lips (10) are carried by a circumferential half of the tube (1).

5. Pipe according to one of claims 1 to 4, characterized in that only the thickened area located by the passage openings (3)

25 (ii) of the filter belt (7) consists of filter material and the parts of the filter belt, which extend therefrom and protrude between the lips (10) and the tube (1), of possibly self-adhesive or stickable ones, preferably with the tube (1) and / or lips (10) weldable, in particular water-impermeable holding strips (11 ') made of a different material,

30 e.g. Plastic, are formed.

6. Pipe according to one of claims 1 to 5, characterized in that the filter band (1), in particular the edge regions of its carrier, is (are) welded or glued to the tube (1) and / or the lips (10).

35

7. Pipe according to one of claims 1 to 6, characterized in that the area (11) of the filter belt lying in the space between the lips (10) in front of the passage openings (3) is thickened.

8. Pipe according to one of claims 1 to 7, characterized in that the lips (10) via dilutions or flexible, thin webs (20) are connected to the tube (1).

9. A method for producing a tube, in particular according to one of claims 1 to 8, for watering plants, in particular root irrigation, which tube is extruded from an extruder and is provided in a subsequent station with passage openings, which are then advantageously in itself Longitudinally moving tube are covered with filter material, characterized in that the tube is extruded with lips advantageously projecting from the tube and that a filter tape is inserted between the lips or the lips and the tube as the filter material covering the passage openings.

10. The method according to claim 7, characterized in that the lips which are still flexible by extrusion or which are made flexible by heating again are pressed against the tube after inserting the filter band and in particular simultaneously or immediately thereafter the filter band is welded or glued to the tube .

11.Filter band for irrigation pipes, in particular according to one of claims 1 to 8, characterized in that the band (7) in its central region for water distribution in the longitudinal direction of the band has a thickened region (11) made of water-permeable material, the laterally outgoing regions (11 ') optionally made of water-impermeable material, which optionally carries an adhesive layer (22) or is weldable.

12. Pipe for watering plants, in particular for root irrigation, with a substantially circular cross section and with through openings, the through openings being covered from the outside with filter material, characterized in that the through openings (3) are opposite the outer surface of the tube (1) are arranged in a recessed manner and are each covered with a piece (6) of filter material.

13. Pipe according to claim 12, characterized in that the passage openings (3) in the bottom area of in in the tube (1) e.g. formed by pressing, in particular circular cylindrical depressions (2) and that the filter material pieces (6) are adapted to the shape of the depressions (2) and are inserted or inserted into them.

14. Pipe according to claim 12 or 13, characterized in that the outer surface of the filter material (6) with the outer surface of the tube ^U (1) is essentially flush.

15. Pipe according to one of claims 12 to 14, characterized in that the individual pieces of filter material (6) are associated with connecting parts (14) which, if appropriate, are inserted into the recesses (2) connecting grooves (15). 5

16. Pipe according to one of claims 12 to 15, characterized in that the filter material pieces (6) for attachment to the tube (1) carry adhesive layers.

17. A method for producing a pipe, in particular according to one of claims 12 to 16, for watering plants, 0 in particular root watering, which pipe is extruded from an extruder and is provided in a subsequent station with passage openings, which are then advantageously in the longitudinal direction Moving tube are covered with filter material, characterized in that preferably at the same time as the formation of the through openings, the tube area lying around the through openings is deepened and pieces of filter material covering or covering the through openings are inserted or applied.

18. The method according to claim 17, characterized in that the 0 pieces of filter material on a carrier tape, in particular glued delivered and pressed against the tube and that the carrier tape is removed after attaching the filter material pieces on the tube.

19. The method according to claim 17 or 18, characterized in that the pieces of filter material are connected to the tube or the recess 5 by welding or gluing.

20. Pipe according to one of claims 1 to 8 or 12 to 16, characterized in that in the interior of the tube (1) a further tube (30) is arranged, which is connected via holes (31) to the interior of the tube (1) and into which the passage openings (3) open.

21. Pipe according to claim 20, characterized in that the through-openings (3) and the holes (31) are offset from one another.

22. Pipe according to claim 20 or 21, characterized in that the cross-sectional area of the further tube (30) is smaller than one tenth of the cross-sectional area of the tube (1).

23. Pipe according to one of claims 20 to 22, characterized in that the tube (1) and the further tube (30) are extruded in one piece.

24. The method according to claim 9, 10 or 17 to 19, characterized in that a further tube lying inside the tube is extruded with the tube.

25. The method according to claim 24, characterized in that with the formation of the passage openings, the interior of the further tube with the interior of the tube connecting holes are limited.

26. The method according to claim 25, characterized in that holes and passage openings or only passage openings are formed in a predetermined alternation or sequence, wherein at least a part, preferably all, of which passage openings prepared at the same time with the holes are closed again.

27. Device for the production of pipes, in particular according to one of claims 1 to 8 or in particular for carrying out the method according to one of claims 9, 10 or 24 to 26, with an extruder, a perforation device for producing passage openings and a feed device for Filter material, characterized in that the extruder head (19) has a shaped head for the extrusion of tubes (1), optionally together with an inner tube (30) with molded lips (10), that the perforation device (4) has a feed or application device (17 ) for a belt (7) made of filter material and that this device (17) has a device (9) for pressing and / or welding or gluing the lips (10) and / or the tube (1) to the filter belt (7 ) is assigned or subordinated.

28. Device for producing pipes, in particular according to one of claims 12 to 16 or in particular for carrying out the method according to one of claims 17 to 19 or 24 to 26, with an extruder, a perforation device and a feed device for filter material, characterized in that that the perforation device (4) is assigned a device (4 ") for forming depressions (2) in the pipe (1), possibly containing an inner pipe (30), around the passage openings (3) the filter material comprises a store (18) for filter material pieces (6) arranged on a carrier tape (5), that optionally a device for controlling the synchronism between the carrier tape (5) and the tube extruded from the extruder head (19) (1) it is provided that a pressing device (8) for the pieces (6) of filter material on the tube (1) or the recess formed in the tube (1) en (2) is provided and 5 that advantageously an extraction device (16) for the carrier film (5) is provided.

29. The device according to claim 27, characterized in that the perforation device is arranged downstream of a device (32) for closing passage openings (3). 0

5

0

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