WO2001056768A1 - Fabrication d'un dispositif d'arrosage par goutte-a-goutte - Google Patents

Fabrication d'un dispositif d'arrosage par goutte-a-goutte Download PDF

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Publication number
WO2001056768A1
WO2001056768A1 PCT/IL2001/000060 IL0100060W WO0156768A1 WO 2001056768 A1 WO2001056768 A1 WO 2001056768A1 IL 0100060 W IL0100060 W IL 0100060W WO 0156768 A1 WO0156768 A1 WO 0156768A1
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WO
WIPO (PCT)
Prior art keywords
thickness
tube
diameter
drip
extrusion head
Prior art date
Application number
PCT/IL2001/000060
Other languages
English (en)
Inventor
Yitzhak Rotem
Original Assignee
Metzerplas Industries Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Metzerplas Industries Ltd. filed Critical Metzerplas Industries Ltd.
Priority to AU2001227026A priority Critical patent/AU2001227026A1/en
Publication of WO2001056768A1 publication Critical patent/WO2001056768A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
    • B29C48/90—Thermal treatment of the stream of extruded material, e.g. cooling with calibration or sizing, i.e. combined with fixing or setting of the final dimensions of the extruded article
    • B29C48/901—Thermal treatment of the stream of extruded material, e.g. cooling with calibration or sizing, i.e. combined with fixing or setting of the final dimensions of the extruded article of hollow bodies
    • B29C48/903—Thermal treatment of the stream of extruded material, e.g. cooling with calibration or sizing, i.e. combined with fixing or setting of the final dimensions of the extruded article of hollow bodies externally
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/09—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/15—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor incorporating preformed parts or layers, e.g. extrusion moulding around inserts
    • B29C48/157—Coating linked inserts, e.g. chains
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
    • B29C48/90—Thermal treatment of the stream of extruded material, e.g. cooling with calibration or sizing, i.e. combined with fixing or setting of the final dimensions of the extruded article
    • B29C48/908—Thermal treatment of the stream of extruded material, e.g. cooling with calibration or sizing, i.e. combined with fixing or setting of the final dimensions of the extruded article characterised by calibrator surface, e.g. structure or holes for lubrication, cooling or venting
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
    • B29C48/911—Cooling
    • B29C48/9115—Cooling of hollow articles
    • B29C48/912—Cooling of hollow articles of tubular films
    • B29C48/913—Cooling of hollow articles of tubular films externally
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
    • B29C48/919—Thermal treatment of the stream of extruded material, e.g. cooling using a bath, e.g. extruding into an open bath to coagulate or cool the material

Definitions

  • the present invention relates to extruded plastic irrigation tubing generally and more particularly to apparatus and methods for the manufactu ⁇ ng of d ⁇ p irrigation tubing
  • the present invention seeks to provide an improved method and apparatus for the manufacturing of plastic irrigation tubing.
  • a method for manufacturing plastic tubes including the steps of: extruding a plastic tube from an extrusion head, the tube having a first diameter and a first thickness as it leaves the extrusion head at a first linear velocity;
  • the present invention a method for manufacturing plastic tubes including the steps of: extruding a plastic tube from an extrusion head, the tube having a first cross-sectional area as it leaves the extrusion head; and
  • the plastic tube downstream of the extrusion head, causing the plastic tube to have a second cross-sectional area, greater than the first cross-sectional area.
  • the plastic tube to have a second diameter and a second thickness as it moves at a second linear velocity, characterized in that at least one of the following conditions is met: the second diameter is greater than the first diameter; the second thickness is greater than the first thickness: and the second linear velocity is less than the first linear velocity.
  • a method for manufacturing a drip irrigation tube including the steps of: extruding a plastic tube from an extrusion head, the tube having a first
  • the plastic tube downstream of the extrusion head, causing the plastic tube to have a second diameter and a second thickness as it moves at a second linear velocity, characterized in that at least one of the following conditions is met: the second diameter is greater than the first diameter; the second thickness is greater than the first thickness: and
  • the second linear velocity is less than the first linear velocity
  • an extruder extruding a plastic tube from an extrusion head, the tube having a first cross-sectional area as it leaves the extrusion head; and a calibrator, downstream of the extrusion head, causing the plastic tube to have a second cross-sectional area, greater than the first cross-sectional area.
  • an extruder extruding a plastic tube from an extrusion head, the tube having a first diameter and a first thickness as it leaves the extrusion head at a first linear velocity;
  • a calibrator downstream of the extrusion head, causing the plastic tube to have a second diameter and a second thickness as it moves at a second linear velocity, characterized in that at least one of the following conditions is met:
  • the second diameter is greater than the first diameter
  • the second thickness is greater than the first thickness; and the second linear velocity is less than the first linear velocity.
  • apparatus for manufacturing a drip irrigation tube including: an extruder, extruding a plastic tube from an extrusion head, the tube
  • apparatus for manufacturing a drip irrigation tube including: an extruder, extruding a plastic tube from an extrusion head, the tube having a first cross-sectional area as it leaves the extrusion head; and a calibrator, downstream of the extrusion head, causing the plastic tube
  • apparatus for manufacturing a drip irrigation tube including: an extruder, extruding a plastic tube from an extrusion head, the tube having a first diameter and a first thickness as it leaves the extrusion head at a first linear velocity;
  • the second diameter is greater than the first diameter
  • the second thickness is greater than the first thickness
  • the second linear velocity is less than the first linear velocity
  • the second diameter is greater than the first diameter.
  • the second diameter is less than the first diameter.
  • the second thickness is greater than the first thickness
  • the second thickness is less than the first thickness.
  • the tube moves at the first velocity along a first axis and moves at the second velocity along a second axis coaxial with the first axis.
  • the tube moves at the first velocity along a first axis and moves at the second velocity along a second axis parallel to and disposed downward with respect to the first axis.
  • the insertion assembly is operative to cause the drip irrigation elements to undergo linear motion of generally the same velocity as that of the tube upon initial contact with the interior thereof.
  • Figs. 1A, IB and 1C are sectional illustrations respectively of apparatus and a method for extruding a plastic tube in accordance with a preferred embodiment of the present invention and of the tube at first and second stages of its manufacture, taken at lines IB - I B and 1 C - 1C in Fig. 1A;
  • Figs. 2 A. 2B and 2C are sectional illustrations respectively of apparatus and a method for extruding a plastic tube in accordance with a preferred embodiment of the present invention and of the tube at first and second stages of its manufacture, taken at lines 2B - 2B and 2C - 2C in Fig. 2A;
  • FIG. 3 A, 3B and 3C are sectional illustrations respectively of apparatus
  • Figs. 4A. 4B and 4C are sectional illustrations respectively of apparatus and a method for extruding a plastic tube in accordance with a preferred embodiment of the present invention and of the tube at first and second stages of its manufacture,
  • Figs. 5 A, 5B and 5C are sectional illustrations respectively of apparatus and a method for extruding a plastic tube in accordance with a preferred embodiment
  • Figs. 6A, 6B and 6C are sectional illustrations respectively of apparatus and a method for extruding a plastic tube in accordance with a preferred embodiment of the present invention and of the tube at first and second stages of its manufacture, taken at lines 6B - 6B and 6C - 6C in Fig. 6A;
  • Figs. 7A. 7B and 7C are sectional illustrations respectively of apparatus
  • Figs. 8A. 8B and 8C are sectional illustrations respectively of apparatus and a method for extruding a plastic tube in accordance with a preferred embodiment
  • Figs. 9A. 9B and 9C are sectional illustrations respectively of apparatus
  • Figs. 10 A. 10B and 10C are sectional illustrations respectively of
  • Fig. 1 1 is a simplified and generalized sectional illustration of apparatus and a method for producing a drip irrigation tube in accordance with a
  • FIGS. 12A, 12B and 12C are simplified sectional illustrations of apparatus and a method for producing a drip irrigation tube corresponding to the
  • Figs. 13 A, 13B and 13C are simplified sectional illustrations of apparatus and a method for producing a drip irrigation tube corresponding to the embodiment of Figs. 1A, IB and IC, at three stages of carrying out of the method and wherein the linear speed of a drip insert is greater than that of the tube upon initial mutual engagement therebetween;
  • Figs. 14A, 14B and 14C are simplified sectional illustrations of
  • Figs. 15 A, 15B and 15C are simplified sectional illustrations of
  • Figs. 16A, 16B and 16C are simplified sectional illustrations of apparatus and a method for producing a drip irrigation tube corresponding to the embodiment of Figs. 2 A, 2B and 2C, at three stages of carrying out of the method and
  • Figs. 17A, 17B and 17C are simplified sectional illustrations of apparatus and a method for producing a drip irrigation tube corresponding to the
  • Figs. 18 A, 18B and 18C are simplified sectional illustrations of apparatus and a method for producing a drip irrigation tube corresponding to the embodiment of Figs. 3A. 3B and 3C. at three stages of carrying out of the method and wherein the linear speed of a drip insert is generally equal to that of the tube upon initial mutual engagement therebetween;
  • Figs. 19 A, 19B and 19C are simplified sectional illustrations of apparatus and a method for producing a drip irrigation tube corresponding to the embodiment of Figs. 3 A, 3B and 3C. at three stages of carrying out of the method and
  • Figs. 20A, 20B and 20C are simplified sectional illustrations of
  • Figs. 21 A, 2 IB and 21C are simplified sectional illustrations of
  • Figs. 22A. 22B and 22C are simplified sectional illustrations of apparatus and a method for producing a drip irrigation tube corresponding to the embodiment of Figs. 4A, 4B and 4C, at three stages of carrying out of the method and
  • Figs. 23 A, 23B and 23C are simplified sectional illustrations of apparatus and a method for producing a drip irrigation tube corresponding to the embodiment of Figs. 4A, 4B and 4C. at three stages of carrying out of the method and wherein the linear speed of a drip insert is less than that of the tube upon initial mutual engagement therebetween;
  • Figs. 24A, 24B and 24C are simplified sectional illustrations of apparatus and a method for producing a drip irrigation tube corresponding to the
  • Figs. 25A, 25B and 25C are simplified sectional illustrations of apparatus and a method for producing a drip irrigation tube corresponding to the embodiment of Figs. 5 A, 5B and 5C. at three stages of carrying out of the method and
  • Figs. 26A, 26B and 26C are simplified sectional illustrations of
  • Figs. 27 A. 27B and 27C are simplified sectional illustrations of apparatus and a method for producing a drip irrigation tube corresponding to the embodiment of Figs. 6A, 6B and 6C, at three stages of carrying out of the method and
  • Figs. 28A, 28B and 28C are simplified sectional illustrations of apparatus and a method for producing a drip irrigation tube corresponding to the embodiment of Figs. 6A, 6B and 6C, at three stages of carrying out of the method and wherein the linear speed of a drip insert is greater than that of the tube upon initial mutual engagement therebetween;
  • Figs. 29A, 29B and 29C are simplified sectional illustrations of
  • Figs. 30A, 30B and 30C are simplified sectional illustrations of apparatus and a method for producing a drip irrigation tube corresponding to the embodiment of Figs. 7A, 7B and 7C. at three stages of carrying out of the method and wherein the linear speed of a drip insert is generally equal to that of the tube upon
  • Figs. 31 A, 3 IB and 31C are simplified sectional illustrations of apparatus and a method for prod icing a drip irrigation tube corresponding to the
  • Figs. 32A, 32B and 32C are simplified sectional illustrations of apparatus and a method for producing a drip irrigation tube corresponding to the embodiment of Figs. 7A. 7B and 7C, at three stages of carrying out of the method and wherein the linear speed of a drip insert is less than that of the tube upon initial mutual engagement therebetween;
  • Figs. 33A, 33B and 33C are simplified sectional illustrations of apparatus and a method for producing a drip irrigation tube corresponding to the
  • Figs. 34A, 34B and 34C are simplified sectional illustrations of apparatus and a method for producing a drip irrigation tube corresponding to the
  • Figs. 35A, 35B and 35C are simplified sectional illustrations of apparatus and a method for producing a drip irrigation tube corresponding to the embodiment of Figs. 8A, 8B and 8C. at three stages of carrying out of the method and wherein the linear speed of a drip insert is less than that of the tube upon initial mutual
  • FIGS. 36A, 36B and 36C are simplified sectional illustrations of apparatus and a method for producing a drip irrigation tube corresponding to the
  • Figs. 37 A, 37B and 37C are simplified sectional illustrations of
  • Figs. 38A, 38B and 38C are simplified sectional illustrations of apparatus and a method for producing a drip irrigation tube corresponding to the
  • Figs. 39A, 39B and 39C are simplified sectional illustrations of
  • Figs. 40A, 40B and 40C are simplified sectional illustrations of apparatus and a method for producing a drip irrigation tube corresponding to the embodiment of Figs. 10A, 10B and IOC, at three stages of carrying out of the method and wherein the linear speed of a drip insert is greater than that of the tube upon initial mutual engagement therebetween;
  • Figs. 41 A, 41 B and 41 C are simplified sectional illustrations of apparatus and a method for producing a drip irrigation tube corresponding to the embodiment of Figs. 10A. 10B and IOC, at three stages of carrying out of the method
  • Figs. 42A, 42B and 42C are simplified sectional illustrations of apparatus and a method for producing a drip irrigation tube corresponding to the embodiment of Figs. 1A, IB and IC. at three stages of carrying out of the method and wherein the linear feeding speed of a drip insert is generally constant:
  • Figs. 43A, 43B and 43C are simplified sectional illustrations of apparatus and a method for producing a drip irrigation tube corresponding to the embodiment of Figs. 2A, 2B and 2C. at three stages of carrying out of the method and wherein the linear feeding speed of a drip insert is generally constant:
  • Figs. 44A, 44B and 44C are simplified sectional illustrations of
  • Figs. 45A, 45B and 45C are simplified sectional illustrations of apparatus and a method for producing a drip irrigation tube corresponding to the embodiment of Figs. 4A, 4B and 4C. at three stages of carrying out of the method and wherein the linear feeding speed of a drip insert is generally constant:
  • Figs. 46A. 46B and 46C are simplified sectional illustrations of
  • Figs. 47A. 47B and 47C are simplified sectional illustrations of apparatus and a method for producing a drip irrigation tube corresponding to the embodiment of Figs. 6 A. 6B and 6C. at three stages of carrying out of the method and wherein the linear feeding speed of a drip insert is generally constant;
  • Figs. 48A, 48B and 48C are simplified sectional illustrations of
  • Figs. 49A, 49B and 49C are simplified sectional illustrations of apparatus and a method for producing a drip irrigation tube corresponding to the embodiment of Figs. 8A, 8B and 8C, at three stages of carrying out of the method and wherein the linear feeding speed of a drip insert is generally constant:
  • Figs. 50A, 50B and 50C are simplified sectional illustrations of
  • Figs. 51 A, 51B and 51C are simplified sectional illustrations of
  • an extruder head 10 forming part of a conventional plastic extrusion machine (not shown), such as an extruder commercially available from NEXTROM of Lausanne, Switzerland, extrudes a seamless tube 12.
  • the tube 12 leaves the extruder at a first linear velocity VI along an axis 14. The outside
  • Fig. IB diameter D and thickness T of the tube as it leaves the extruder are shown in Fig. IB at lines IB - IB to be Dl and TI . respectively.
  • T2 of the final tube as it leaves the calibrator 16 are also determined by the second linear velocity V2 at which the tube is drawn through the calibrator by drawing apparatus (not shown) downstream of the calibrator 16.
  • the cross-sectional area of the tube as it leaves the calibrator 16 is larger than the cross-sectional area of the tube as it leaves the extruder head 10. This feature may be realized when at least one of the following conditions is met:
  • the second diameter D2 is greater than the first diameter Dl ; the second thickness T2 is greater than the first thickness TI .
  • the calibrator 16 is aligned coaxially with the extruder head 10, along axis 14.
  • FIG. 2A, 2B and 2C are sectional
  • an extruder head 20 forming part of a conventional plastic extrusion machine (not shown), such as an extruder commercially available from NEXTROM of Lausanne, Switzerland, extrudes a seamless tube 22.
  • the tube 22 leaves the extruder at a first linear velocity VI along an axis 24.
  • the outside diameter D and thickness T of the tube as it leaves the extruder are shown in Fig. 2B at lines 2B - 2B to be Dl and TI, respectively.
  • a calibrator 26 Downstream of the extruder head 20 and typically spaced therefrom by approximately 30 - 70 mm is a calibrator 26. which assists in determining the outside diameter D and thickness T of the final tube.
  • T2 of the final tube as it leaves the calibrator 26 are also determined by the second
  • the calibrator 26, shown in Fig. 2C at lines 2C - 2C is greater than the cross-sectional area of the tube shown in Fig. 2B at lines 2B - 2B.
  • an extruder head 30 forming part of a conventional plastic extrusion machine (not shown), such as an extruder commercially available from NEXTROM of Lausanne. Switzerland, extrudes a seamless tube 32.
  • the tube 32 leaves the extruder at a first linear velocity VI along an axis 34.
  • the outside diameter D and thickness T of the tube as it leaves the extruder are shown in Fig. 3B at lines 3B - 3B to be Dl and TI, respectively.
  • a calibrator 36 Downstream of the extruder head 30 and typically spaced therefrom by approximately 30 - 70 mm is a calibrator 36. which assists in determining the outside diameter D and thickness T of the final tube.
  • the outside diameter D2 and thickness T2 of the final tube as it leaves the calibrator 36 are also determined by the second linear velocity V2 at which the tube is drawn through the calibrator by drawing
  • an extruder head 40 forming part of a conventional plastic extrusion machine (not shown), such as an extruder commercially available from NEXTROM of Lausanr e, Switzerland, extrudes a seamless tube 42.
  • the tube 42 leaves the extruder at a first linear velocity VI along an axis 44.
  • diameter D and thickness T of the tube as it leaves the extruder are shown in Fig. 4B at lines 4B - 4B to be Dl and TI, respectively.
  • a calibrator 46 Downstream of the extruder head 40 and typically spaced therefrom by approximately 30 - 70 mm .is a calibrator 46. which assists in determining the outside diameter D and thickness T of the final tube.
  • the outside diameter D2 and thickness T2 of the final tube as it leaves the calibrator 46 are also determined by the second linear velocity V2 at which the tube is drawn through the calibrator by drawing
  • an extruder head 50 forming part of a conventional plastic extrusion machine (not shown), such as an extruder commercially available from NEXTROM of Lausanne, Switzerland, extrudes a seamless tube 52.
  • the tube 52 leaves the extruder at a first linear velocity VI along an axis 54.
  • diameter D and thickness T of the tube as it leaves the extruder are shown in Fig. 5B at lines 5B - 5B to be Dl and TI . respectively.
  • a calibrator 56 Downstream of the extruder head 50 and typically spaced therefrom by approximately 30 - 70 mm is a calibrator 56, which assists in determining the outside diameter D and thickness T of the final tube.
  • T2 of the final tube as it leaves the calibrator 56 are also determined by the second
  • an extruder head 60 forming part of a conventional plastic extrusion machine (not shown), such as an extruder commercially available from NEXTROM of Lausanne. Switzerland, extrudes a seamless tube 62.
  • the tube 62 leaves the extruder at a first linear velocity VI along an axis 64.
  • the outside diameter D and thickness T of the tube as it leaves the extruder are shown in Fig. 6B at lines 6B - 6B to be Dl and TI . respectively.
  • the outside diameter D2 and thickness 12 of the final tube as it leaves the calibrator 66 are also determined by the second linear velocity V2 at which the tube is drawn through the calibrator by drawing apparatus (not shown) downstream of the calibrator 66.
  • the cross-sectional area of the tube downstream of the calibrator 66, shown in Fig. 6C at lines 6C - 6C is greater than the cross-sectional area of the tube shown in Fig. 6B at lines 6B - 6B.
  • an extruder head 70 forming part of a conventional plastic extrusion machine (not shown), such as an extruder commercially available from NEXTROM of Lausanne. Switzerland, extrudes a seamless tube 72.
  • the tube 72 leaves the extruder at a first linear velocity V 1 along an axis 74.
  • the outside diameter D and thickness T of the tube as it leaves the extruder are shown in Fig. 7B at
  • a calibrator 76 Downstream of the extruder head 70 and typically spaced therefrom by approximately 30 - 70 mm is a calibrator 76, which assists in determining the outside
  • T2 of the final tube as it leaves the calibrator 76 are also determined by the second linear velocity V2 at which the tube is drawn through the calibrator by drawing
  • the calibrator 76 is aligned along an axis 78 parallel to and offset downwardly with respect to axis 74.
  • FIGS. 8A, 8B and 8C are sectional illustrations respectively of apparatus and a method for extruding a plastic tube in
  • an extruder head 80 forming part of a conventional plastic extrusion machine (not shown), such as an extruder commercially available from NEXTROM of Lausanne. Switzerland, extrudes a seamless tube 82.
  • the tube 82 leaves the extruder at a first linear velocity VI along an axis 84.
  • the outside diameter D and thickness T of the tube as it leaves the extruder are shown in Fig. 8B at lines 8B - 8B to be Dl and TI, respectively.
  • T2 of the final tube as it leaves the calibrator 86 are also determined by the second linear velocity V2 at which the tube is drawn through the calibrator by drawing
  • an extruder head 90 forming part of a conventional plastic extrusion machine (not shown), such as an extruder commercially available from NEXTROM of Lausanne, Switzerland, extrudes a seamless tube 92.
  • the tube 92 leaves the extruder at a first linear velocity VI along an axis 94.
  • the outside diameter D and thickness T of the tube as it leaves the extruder are shown in Fig. 9B at lines 9B - 9B to be Dl and TI, respectively.
  • T2 of the final tube as it leaves the calibrator 96 are also determined by the second linear velocity V2 at which the tube is drawn through the calibrator by drawing
  • cross-sectional area of the tube downstream of the calibrator 96 shown in Fig. 9C at lines 9C - 9C. is greater than the cross-sectional
  • Figs. 10A, 10B and IOC are sectional illustrations respectively of apparatus and a method for extruding a plastic tube in accordance with still another preferred embodiment of the present invention
  • an extruder head 100 forming part of a conventional plastic extrusion machine (not shown), such as an extruder commercially available from NEXTROM of Lausanne, Switzerland, extrudes a seamless tube 102.
  • the tube 102 leaves the extruder at a first linear velocity V I along an axis 104.
  • a calibrator 106 Downstream of the extruder head 100 and typically spaced therefrom by approximately 30 - 70 mm is a calibrator 106, which assists in determining the outside diameter D and thickness T of the final tube.
  • thickness T2 of the final tube as it leaves the calibrator 106 are also determined by the second linear velocity V2 at which the tube is drawn through the calibrator by drawing
  • the calibrator 106 is aligned along an axis 108, which is parallel to and offset downwardly with respect to axis 104.
  • Fig. 1 1 illustrates, in a general sense, the manufacture of a drip irrigation tube in accordance with a preferred embodiment of the present invention.
  • the method is illustrated in the context of the embodiment shown in Figs. 9A - 9C of a method for manufacture of an extruded plastic tube, it being appreciated that the invention is not limited to that embodiment.
  • drip irrigation inserts 200 are fed through the
  • drip irrigation insert 200 into drip irrigation tube 202 takes place typically at a calibrator 208, which, as described above,
  • the tube 202 passes through a further extent of the water bath 210 and then passes through a cooling water bath 212, which is maintained at atmospheric pressure.
  • the tube 202 Downstream of cooling water bath 212 the tube 202 is apertured at appropriate locations relative to the drip inserts 200 by a hole maker 214 and is engaged by one or more puller mechanism 216. one, but not all of which may be upstream of the hole maker 214. The tube is then rolled by a coiler 218.
  • the linear velocity of the tube 200 at the calibrator 208 is less than the linear velocity of the tube 200 upstream thereof at the extrusion head 201.
  • irrigation tube corresponding to the embodiment of Figs. 1A, IB and IC, at three stages of carrying out of the method and wherein the linear speed of a drip insert is generally equal to that of the tube upon initial mutual engagement therebetween.
  • a drip irrigation tube 250 is manufactured
  • Tl the thickness of the tube 250, as it exits extrusion head 252, is less than T2. the thickness of the tube 250 at calibrator 254, downstream of the extrusion head;
  • a series of drip inserts 256 including a forward drip insert 260 are at rest at a time tl . Thereafter, as seen in Fig. 12B, the
  • the remaining drip inserts 256. including a next-in-line drip insert 262. remain at rest until such time as it is necessary to insert the next-in-line drip insert 262 in order to achieve a desired spacing of drip inserts along the tube 250.
  • FIGS. 13A. 13B and 13C are simplified sectional illustrations of apparatus and a method for producing a drip
  • a drip irrigation tube 350 is manufactured under conditions wherein the following parameters are operative:
  • the linear speed of the tube 350, as it exits an extrusion head 352, is greater than V2.
  • Dl the outer diameter of the tube 350, as it exits extrusion head 352, is generally equal to D2.
  • Tl the thickness of the tube 350, as it exits extrusion head 352, is less than T2 the thickness of the tube 350 at calibrator 354, downstream of the extrusion
  • a series of drip inserts 356 including a forward drip inse ⁇ 360 are at rest at a time tl . Thereafter, as seen in Fig. 13B, the series of drip inserts 356, including forward drip insert 360, are caused to move
  • V3 which is greater than the linear velocity V2 of the tube at the location at which
  • FIGS. 14 A, 14B and 14C are simplified sectional illustrations of apparatus and a method for producing a drip irrigation tube
  • a drip irrigation tube 450 is manufactured under conditions wherein the following parameters are operative:
  • a series of drip inserts 456 including a forward drip insert 460 are at rest at a time tl . Thereafter, as seen in Fig. 14B, the
  • series of drip inserts 456, including forward drip insert 460 are caused to move forward at linear velocity V3, such that forward drip insert 460 r.ioves at linear velocity V3 which is less than the linear velocity V2 of the tube at the location at which inuial mutual engagement of the insert with the tube takes place.
  • Figs. 15 A. 15B and 15C are simplified sectional illustrations of apparatus and a method for producing a drip irrigation tube corresponding to the embodiment of Figs. 2A, 2B and 2C, at three
  • a drip irrigation tube 550 is manufactured
  • Dl the outer diameter of the tube 550. as it exits extrusion head 552, is smaller than D2, the outer diameter of the tube 550 at calibrator 554. downstream of the extrusion head;
  • Tl the thickness of the tube 550, as it exits extrusion head 552, is generally equal to T2, the thickness of the tube 550 at calibrator 554. downstream of the extrusion head:
  • a series of drip inserts 556 including a forward drip insert 560 are at rest at a time tl . Thereafter, as seen in Fig. 15B, the series of drip inserts 556, including forward drip insert 560, are caused to move
  • FIGs. 16A, 16B and 16C are simplified sectional illustrations of apparatus and a method for producing a drip irrigation tube corresponding to the embodiment of Figs. 2A. 2B and 2C, at three stages of carrying out of the method and wherein the linear speed of a drip insert is greater than that of the tube upon initial mutual engagement therebetween.
  • a drip irrigation tube 650 is manufactured
  • the linear speed of the tube 650, as it exits an extrusion head 652, is greater than V2.
  • the outer diameter of the tube 650, as it exits extrusion head 652, is smaller than D2. the outer diameter of the tube 650 at calibrator 654. downstream of
  • Tl the thickness of the tube 650, as it exits extrusion head 652, is
  • T2 the thickness of the tube 650 at calibrator 654. downstream of the extrusion head:
  • the insertion speed of a drip insert 656 into tube 650 is greater than V2 upon initial mutual engagement therebetween.
  • a series of drip inserts 656 including
  • a forward drip insert 660 are at rest at a time tl . Thereafter, as seen in Fig. 16B, the series of drip inserts 656. including forward drip insert 660. are caused to move forward at linear velocity V3. such that forward drip insert 660 moves at linear velocity V3 which is greater than the linear velocity V2 of the tube at the location at which initial mutual engagement of the insert with the tube takes place.
  • FIGS. 17A, 17B and 17C are simplified sectional illustrations of apparatus and a method for producing a drip irrigation tube
  • a drip irrigation tube 750 is manufactured under conditions wherein the following parameters are operative:
  • Tl the thickr ess of the tube 750. as it exits extrusion head 752. is generally equal to T2. the thickness of the tube 750 at calibrator 754. downstream of the extrusion head;
  • the insertion speed of a drip insert 756 into tube 750 is less than V2 upon initial mutual engagement therebetween.
  • a series of drip inserts 756 including a forward drip insert 760 are at rest at a time tl . Thereafter, as seen in Fig. 17B, the
  • series of drip inserts 756. including forward drip insert 760. are caused to move forward at linear velocity V3. such that forward drip insert 760 moves at linear velocity V3 which is less than the linear velocity V2 of the tube at the location at which initial mutual engagement of the insert with the tube takes place.
  • a drip irrigation tube 850 is manufactured under conditions wherein the following parameters are operative: VI, the linear speed of the tube 850. as it exits an extrusion head 852, is greater than V2. the linear speed of the tube 850 at a calibrator 854. downstream of the extrusion head;
  • the thickness of the tube 850, as it exits e ⁇ irusion head 852, is less than T2. the thickness of the tube 850 at calibrator 854, downstream of the extrusion head;
  • a series of drip inserts 856 including a forward drip insert 860. are at rest at a time tl . Thereafter, as seen in Fig. 18B, the
  • the remaining drip inserts 856 including a next-in-line drip insert 862, remain at rest until such time as it is necessary to insert the next-in-line drip insert 862 in order to achieve a desired spacing of drip inserts along the tube 850.
  • Figs. 19A. 19B and 19C are simplified sectional illustrations of apparatus and a method for producing a drip irrigation tube corresponding to the embodiment of Figs. 1A, IB and IC, at three
  • a drip irrigation tube 950 is manufactured under conditions wherein the following parameters are operative:
  • the linear speed of the tube 950, as it exits an extrusion head 952, is greater than V2, the linear speed of the tube 950 at a calibrator 954, downstream of the extrusion head;
  • a series of drip inserts 956 including a forward drip insert 960. are at rest at a time tl .
  • the series of drip inserts 956, including forward drip insert 960. are caused to move forward at linear velocity V3. such that forward drip insert 960 moves at linear velocity V3 which is greater than the linear velocity V2 of the tube at the location at which initial mutual engagement of the insert with the tube takes place.
  • FIGS. 20A, 20B and 20C are simplified sectional illustrations of apparatus and a method for producing a drip irrigation tube corresponding to the embodiment of Figs. 3 A. 3B and 3C, at three stages of carrying
  • a drip irrigation tube 1050 is manufactured
  • the linear speed of the tube 1050, as it exits an extrusion head 1052 is greater than V2, the linear speed of the tube 1050 at a calibrator 1054, downstream of the extrusion head; Dl. the outei diameter of the tube 1050, as it exits extrusion head 1052, is smaller than D2, the outer diameter of the tube 1050 at calibrator 1054, downstream of the extrusion head:
  • Tl the thickness of the tube 1050, as it exits extrusion head 1052, is less than T2. the thickness of the tube 1050 at calibrator 1054, downstream of the extrusion head;
  • a series of drip inserts 1056 including a forward drip insert 1060 are at rest at a time tl . Thereafter, as seen in Fig. 20B. the series of drip inserts 1056. including forward drip insert 1060. are caused to move forward at linear velocity V3. such that forward drip insert 1060 moves at linear
  • insert 1062 remain at rest until such time as it is necessary to insert the next-in-line
  • drip insert 1062 in order to achieve a desired spacing of drip inserts along the tube 1050.
  • irrigation tube corresponding to the embodiment of Figs. 4A, 4B and 4C, at three stages of carrying out of the method and wherein the linear speed of a drip insert is generally equal to that of the tube upon initial mutual engagement therebetween.
  • a drip irrigation tube 1 150 is manufactured
  • the outer diameter of the tube 1 150. as it exits extrusion head 1 152, is greater than D2, the outer diameter of the tube 1 150 at calibrator 1 154, downstream of the extrusion head;
  • the series of drip inserts 1156. including forward drip insert 1 160 are caused to move forward at linear velocity V3 , such that forward drip insert 1 160 moves at linear velocity V3 which is equal to the linear velocity V2 of the tube at the location at which initial mutual engagement of the insert with the tube takes place.
  • a drip irrigation tube 1250 is manufactured under conditions wherein the following parameters are operative:
  • Tl the thickness of the tube 1250, as it exits extrusion head 1252, is less than T2, the thickness of the tube 1250 at calibrator 1254, downstream of the extrusion head;
  • V3 the insertion speed of a drip insert 1256 into tube 1250 is greater than V2 upon initial mutual engagement therebetween.
  • a series of drip inserts 1256 including a forward drip insert 1260. are at rest at a time tl . Thereafter, as seen in Fig.
  • the series of drip inserts 1256 including forward drip insert 1260, are caused to move forward at linear velocity V3. such that forward drip insert 1260 moves at linear velocity V3 which is greater than the linear velocity V2 of the tube at the location at which initial mutual engagement of the insert with the tube takes place.
  • the remaining drip inserts 1256 including a next-in-line drip insert 1262. remain at rest until such time as it is necessary to insert the next-in-line drip insert 1262 in order to achieve a desired spacing of drip inserts along the tube 1250.
  • a drip irrigation tube 1350 is manufactured under conditions wherein the following parameters are operative: VI, the linear speed of the tube 1350, as it exits an extrusion head 1352, is greater than V2. the linear ⁇ peed of the tube 1350 at a calibrator 1354, downstream of the extrusion head:
  • the insertion speed of a drip insert 1356 into tube 1350 is less than V2 upon initial mutual engagement therebetween.
  • a series of drip inserts 1356 including a forward drip insert 1360. are at rest at a time tl . Thereafter, as seen in Fig. 23 A.
  • the remaining drip inserts 1356 including a next-in-line drip insert 1362, remain at rest until such time as it is necessary to insert the next-in-line drip insert 1362 in order to achieve a desired spacing of drip inserts along the tube 1350.
  • Figs. 24A, 24B and 24C are simplified sectional illustrations of apparatus and a method for producing a drip irrigation tube corresponding to the embodiment of Figs. 5 A, 5B and 5C, at three stages of carrying out of the method and wherein the linear speed of a drip insert is
  • a drip irrigation tube 1450 is manufactured under conditions wherein the following parameters are operative:
  • the linear speed of the tube 1450. as it exits an extrusion head 1452 is greater than V2.
  • the outer diameter of the tube 1450, as it exits extrusion head 1452. is less than D2. the outer diameter of the tube 1450 at calibrator 1454, downstream of the extrusion head;
  • Tl the thickness of the tube 1450, as it exits extrusion head 1452, is greater than T2
  • a series of drip inserts 1456 including a forward drip insert 1460 are at rest at a time tl . Thereafter, as seen in Fig. 24B. the series of drip inserts 1456, including forward drip insert 1460, are caused to
  • forward drip insert 1460 moves at linear velocity V3 which is equal to the linear velocity V2 of the tube at the location at which initial mutual engagement of the insert with the tube takes place.
  • insert 1462 remain at rest until such time as it is necessary to insert the next-in-line
  • drip insert 1462 in order to achieve a desired spacing of drip inserts along the tube 1450.
  • Figs. 25A, 25B and 25C are simplified sectional illustrations of apparatus and a method for producing a drip irrigation tube corresponding to the embodiment of Figs. 5 A, 5B and 5C, at three stages of carrying out of the method and wherein the linear speed of a drip insert is
  • a drip irrigation tube 1550 is manufactured
  • the linear speed of the tube 1550, as it exits an extrusion head 1552, is greater than V2. the linear speed of the tube 1550 at a calibrator 1554, downstream of the extrusion head;
  • Tl the thickness of the tube 1550. as it exits extrusion head 1552, is greater than T2. the thickness of the tube 1550 at calibrator 1554, downstream of the extrusion head:
  • the insertion speed of a drip insert 1556 into tube 1550 is greater than V2 upon initial mutual engagement therebetween.
  • drip insert 1562 in order to achieve a desired spacing of drip inserts along the tube 1550.
  • a drip irrigation tube 1650 is manufactured under conditions wherein the following parameters are operative:
  • Dl the outer diameter of the tube 1650, as it exits extrusion head 1652. is less than D2. the outer diameter of the tube 1650 at calibrator 1654, downstream of the extrusion head;
  • Tl the thickness of the tube 1650, as it exits extrusion head 1652, is greater than T2, the thickness of the tube 1650 at calibrator 1654, downstream of the extrusion head;
  • the insertion speed of a drip insert 1656 into tube 1650 is less than V2 upon initial mutual engagement therebetween.
  • the series of drip inserts 1656. including forward drip insert 1660 are caused to move forward at linear velocity V3, such that forward drip insert 1660 moves at linear velocity V3 which is less than the linear velocity V2 of the tube at the location at which initial mutual engagement of the insert with the tube takes place.
  • the remaining drip inserts 1656, including a next-in-line drip insert 1662. remain at rest until such time as it is necessary to insert the next-in-line
  • drip insert 1662 in order to achieve a desired spacing of drip inserts along the tube 1650.
  • FIGS. 27A, 27B and 27C are simplified sectional illustrations of apparatus and a method for producing a drip
  • irrigation tube corresponding to the embodiment of Figs. 6A. 6B and 6C. at three stages of carrying out of the method and wherein the linear speed of a drip insert is generally equal to that of the tube upon initial mutual engagement therebetween.
  • a drip irrigation tube 1750 is manufactured under conditions wherein the following parameters are operative:
  • a series of drip inserts 1756 including a forward drip insert 1760. are at rest at a time tl . Thereafter, as seen in Fig.
  • the series of drip inserts 1756. including forward drip insert 1760. are caused to move forward at linear velocity V3. such that forward drip insert 1760 moves at linear velocity V3 which is equal to the linear velocity V2 of the tube at the location at which initial mutual engagement of the insert with the tube takes place.
  • the remaining drip inserts 1756 including a next-in-line drip insert 1762, remain at rest until such time as it is necessary to insert the next-in-line drip insert 1762 in order to achieve a desired spacing of drip inserts along the tube 1750.
  • a drip irrigation tube 350 is manufactured
  • Dl the outer diameter of the tube 1850, as it exits extrusion head 1852, is generally equal to D2.
  • Tl the thickness of the tube 1850, as it exits extrusion head 1852, is less than T2. the thickness of the tube 1850 at calibrator 1854, downstream of the extrusion head;
  • a series of drip inserts 1856 including a forward drip insert 1860. are at rest at a time tl . Thereafter, as seen in Fig. 28B. the series of drip inserts 1856, including forward drip insert 1860. are caused to
  • drip insert 1862 in order to achieve a desired spacing of drip inserts along the tube 1850.
  • a drip irrigation tube 1950 is manufactured under conditions wherein the following parameters are operative:
  • the linear speed of the tube 1950, as it exits an extrusion head 1952, is greater than V2.
  • Dl the outer diameter of the tube 1950, as it exits extrusion head 1952, is generally equal to D2, the outer diameter of the tube 1950 at calibrator 1954, downstream of the extrusion head;
  • Tl the thickness of the tube 1950, as it exits extrusion head 1952.
  • a series of drip inserts 1956 including a forward drip insert 1960 are at rest at a time tl . Thereafter, as seen in Fig. 29A, it is seen that a series of drip inserts 1956 including a forward drip insert 1960, are at rest at a time tl . Thereafter, as seen in Fig.
  • Figs. 30A, 30B and 30C are simplified sectional illustrations of apparatus and a method for producing a drip irrigation tube corresponding to the embodiment of Figs. 7A. 7B and 7C, at three stages of carrying out of the method and wherein the linear speed of a drip insert is
  • a drip irrigation tube 2050 is manufactured
  • the linear speed of the tube 2050, as it exits an extrusion head 2052, is greater than V2. the linear speed of the tube 2050 at a calibrator 2054. downstream of the extrusion head;
  • Tl the thickness of the tube 2050, as it exits extrusion head 2052, is generally equal to T2.
  • Fig. 30A it is seen that a series of drip inserts 2056
  • a forward drip insert 2060 including a forward drip insert 2060. are at rest at a time tl . Thereafter, as seen in Fig. 30B, the series of drip inserts 2056. including forward drip insert 2060, are caused to move forward at linear velocity V3, such that forward drip insert 2060 moves at linear velocity V3 which is equal to the linear velocity V2 of the tube at the location at which initial mutual engagement of the insert with the tube takes place.
  • Figs. 31 A. 31 B and 31 C are simplified sectional illustrations of apparatus and a method for producing a drip
  • irrigation tube corresponding to the embodiment of Figs. 7A. 7B and 7C. at three stages of carrying out of the method and wherein the linear speed of a drip insert is greater than that of the tube upon initial mutual engagement therebetween.
  • a drip irrigation tube 2150 is manufactured
  • the outer diameter of the tube 2150, as it exits extrusion head 2152, is smaller than D2, the outer diameter of the tube 2150 at calibrator 2154, downstream of the extrusion head;
  • Tl the thickness of the tube 2150. as it exits extrusion head 2152, is generally equal to T2. the thickness of the tube 21 0 at calibrator 2154. downstream of the extrusion head;
  • V3 the insertion ' speed of a drip insert 2156 into tube 2150 is greater than V2 upon initial mutual engagement therebetween.
  • the remaining drip inserts 2156 including a next-in-line drip insert 2162, remain at rest until such time as it is necessary to insert the next-in-line drip insert 2162 in order to acl ieve a desired spacing of drip inserts along the tube 2150.
  • FIGS. 32A. 32B and 32C are simplified sectional illustrations of apparatus and a method for producing a drip irrigation tube
  • a drip irrigation tube 2250 is manufactured under conditions wherein the following parameters are operative:
  • V2 the linear speed of the tube 2250 at a calibrator 2254, downstream of the extrusion head
  • Dl the outer diameter of the tube 2250, as it exits extrusion head 2252. is smaller than D2, the outer diameter of the tube 2250 at calibrator 2254, downstream of the extrusion head;
  • Tl the thickness of the tube 2250, as it exits extrusion head 2252
  • a series of drip inserts 2256 including a forward drip insert 2260. are at rest at a time tl . Thereafter, as seen in Fig. 32B. the series of drip inserts 2256. including forward drip insert 2260. are caused to
  • forward drip insert 2260 moves at linear velocity V3 which is less than the linear velocity V2 of the tube at the location at which initial mutual engagement of the insert with the tube takes place.
  • drip insert 2262 in order to achieve a desired spacing of drip insens along the tube 2250.
  • a drip irrigation tube 2350 is manufactured
  • Tl the thickness of the tube 2350. as it exits extrusion head 2352, is less than T2. the thickness of the tube 2350 at calibrator 2354. downstream of the extrusion head;
  • a series of drip inserts 2356 including a forward drip insert 2360. are at rest at a time tl . Thereafter, as seen in Fig. 33B, the series of drip inserts 2356, including forward drip insert 2360, are caused to move forward at linear velocity V3, such that forward drip insert 2360 moves at linear
  • drip insert 2362 in order to achieve a desired spacing of drip inserts along the tube 2350.
  • Figs. 34A. 34B and 34C are simplified sectional illustrations of apparatus and a method for producing a drip irrigation tube corresponding to the embodiment of Figs. 8 A. 8B and 8C. at three stages of carrying out of the method and wherein the linear speed of a drip insert is
  • a drip irrigation tube 2450 is manufactured under conditions wherein the following parameters are operative:
  • the linear speed of the tube 2450, as it exits an extrusion head 2452, is greater than V2, the linear speed of the tube 2450 at a calibrator 2454, downstream of the extrusion head;
  • Dl the outer diameter of the tube 2450, as it exits extrusion head 2452, is less than D2, the outer diameter of the tube 2450 at calibrator 2454. downstream of the extrusion head:
  • Tl the thickness of the tube 2450, as it exits extrusion head 2452, is less than T2. the thickness of the tube 2450 at calibrator 2454, downstream of the extrusion head:
  • a series of drip inserts 2456 including a forward drip insert 2460. are at rest at a time tl . Thereafter, as seen in Fig. 34B. the series of drip inserts 2456. including forward drip insert 2460. are caused to move forward at linear velocity V3, such that forward drip insert 2460 moves at linear velocity V3 which is greater than the linear velocity V2 of the tube at the location at
  • Figs. 35A, 35B and 35C are simplified sectional illustrations of apparatus and a method for producing a drip irrigation tube corresponding to the embodiment of Figs. 8A, 8B and 8C, at three stages of carrying
  • a drip irrigation tube 2550 is manufactured
  • Tl the thickness of the tube 2550, as it exits extrusion head 2552
  • the insertion speed of a drip insert 2556 into tube 2550 is less than V2 upon initial mutual engagement therebetween.
  • a series of drip inserts 2556 including a forward drip insert 2560. are at rest at a time tl . Thereafter, as seen in Fig. 35A.
  • the series of drip inserts 2556 including forward drip insert 2560, are caused to move forward at linear velocity V3, such that forward drip insert 2560 moves at linear velocity V3 which is less than the linear velocity V2 of the tube at the location at which initial mutual engagement of the insert with the tube takes place.
  • the remaining drip inserts 2556 including a next-in-line drip insert 2562. remain at rest until such time as it is necessary to insert the next-in-line drip insert 2562 in order to achieve a desired spacing of drip inserts along the tube 2550.
  • a drip irrigation tube 2650 is manufactured under conditions wherein the following parameters are operative:
  • V2 the linear speed of the tube 2650 at a calibrator 2654, downstream of the extrusion head
  • Tl the thickness of the tube 2650, as it exits extrusion head 2652
  • drip insert 2662 in order to achieve a desired spacing of drip inserts along the tube 2650.
  • Figs. 37A, 37B and 37C are simplified sectional illustrations of apparatus and a method for producing a drip irrigation tube corresponding to the embodiment of Figs. 9 A, 9B and 9C, at three stages of carrying out of the method and wherein the linear speed of a drip insert is greater than that of the tube upon initial mutual engagement therebetween.
  • a drip irrigation tube 2750 is manufactured under conditions wherein the following parameters are operative:
  • Dl the outer diameter of the tube 2750, as it exits extrusion head 2752. is greater than D2, the outer diameter of the tube 2750 at calibrator 2754,
  • Tl the thickness of the tube 2750, as it exits extrusion head 2752
  • a forward drip insert 2760 including a forward drip insert 2760. are at rest at a time tl . Thereafter, as seen in Fig. 37B, the series of drip insert.. 2756. including forward drip insert 2760, are caused to move forward at linear velocity V3, such that forward drip insert 2760 moves at linear velocity V3 which is greater than the linear velocity V2 of the tube at the location at which initial mutual engagement of the insert with the tube takes place.
  • drip insert 2762 in order to achieve a desired spacing of drip inserts along the tube 2750.
  • FIGS. 38 A, 38B and 38C are simplified sectional illustration ⁇ of apparatus and a method for producing a drip irrigation tube
  • a drip irrigation tube 2850 is manufactured under conditions wherein the following parameters are operative:
  • the thickness of the tube 2850, as it exits extrusion head 2852 is less than T2. the thickness of the tube 2850 at calibrator 2854, downstream of the extrusion head: and
  • a series of drip inserts 2856 including a forward drip insert 2860 are at rest at a time tl . Thereafter, as seen in Fig. 38B. the series of drip inserts 2856, including forward drip insti 2860, are caused to move forward at linear velocity V3, such that forward drip insert 2860 moves at linear
  • drip insert 2862 in order to achieve a desired spacing of drip inserts along the tube 2850.
  • a drip irrigation tube 2950 is manufactured
  • VI the linear speed of the tube 2950, as it exits an extrusion head 2952, is greater than V2. the linear speed of the tube 2950 at a calibrator 2954. downstream of the extrusion head;
  • 2952. is less than D2, the outer diameter of the tube 2950 at calibrator 2954, downstream of the extrusion head;
  • Tl the thickness of the tube 2950, as it exits extrusion head 2952, is greater than T2, the thickness of the tube 2950 at calibrator 2954, downstream of the extrusion head;
  • the series of drip inserts 2956 including forward drip insert 2960, are caused to move forward at linear velocity V3, such that forward drip insert 2960 moves at linear velocity V3 which is equal to the linear velocity V2 of the tube at the location at
  • the remaining drip inserts 2956 including a next-in-line drip insert 2962, remain at rest until such time as it is necessary to insert the next-in-line drip insert 2962 in order to achieve a desired spacing of drip inserts along the tube 2950.
  • Figs. 40A, 40B and 40C are simplified sectional illustrations of apparatus and a method for producing a drip irrigation tube corresponding to the embodiment of Figs. 10A. 10B and IOC, at three stages of carrying out of the method and wherein the linear speed of a drip insert is greater than that of the tube upon initial mutual engagement therebetween.
  • a drip irrigation tube 3050 is manufactured
  • Tl the thickness of the tube 3050, as it exits extrusion head 3052, is greater than T2
  • a series of drip inserts 3056 including a forward drip inser 3060. are at rest at a time tl . Thereafter, as seen in Fig.
  • the series of drip inserts T>056, including forward drip insert 3060, are caused to move forward at linear velocity V3, such that forward drip insert 3060 moves at linear velocity V3 which is greater than the linear velocity V2 of the tube at the location at which initial mutual engagement of the insert with the tube takes place.
  • a drip irrigation tube 3150 is manufactured under conditions wherein the following parameters are operative:
  • Dl the outer diameter of the tube 3150, as it exits extrusion head 3152, is less than D2. the outer diameter of the tube 3150 at calibrator 3154, downstream of the extrusion head;
  • Tl the thickness of the tube 3150. as it exits extrusion head 3152, is greater than T2. the thickness of the tube 3150 at calibrator 3154, downstream of the extrusion head;
  • the insertion speed of a drip insert 3156 into tube 3150 is less than V2 upon initial mutual engagement therebetween.
  • a series of drip inserts 3156 including a forward drip insert 3160 are at rest at a time tl . Thereafter, as seen in Fig. 41 A. it is seen that a series of drip inserts 3156 including a forward drip insert 3160, are at rest at a time tl . Thereafter, as seen in Fig. 41 A.
  • drip insert 3162 in order to achieve a desired spacing of drip inserts along the tube 3150.
  • irrigation tube corresponding to the embodiment of Figs. 1A. IB and IC, at three stages of carrying out of the method and wherein the linear feeding speed of a drip
  • a drip irrigation tube 3250 is manufactured under conditions wherein the following parameters are operative:
  • the linear speed of the tube 3250, as it exits an extrusion head 3252, is greater than V2.
  • the outer diameter of the tube 3250, as it exits extrusion head 3252, is generally equal to D2, the outer diameter of the tube 3250 at calibrator 3254, downstream cf the extrusion head;
  • Tl the thickness of the tube 3250, as it exits extrusion head 3252, is less than T2, the thickness of the tube 3250 at calibrator 3254, downstream of the extrusion head;
  • a forward drip insert 3260 are in continuous linear motion at a generally uniform velocity V3 at all relevant times, here indicated by times tl, t2 and t3.
  • drip inserts 3256 including forward drip insert 3260 continue to move forward at
  • Figs. 43 A, 43 B and 43C are simplified sectional illustrations of apparatus and a method for producing a drip irrigation tube corresponding to the embodiment of Figs. 2A, 2B and 2C, at three
  • a drip irrigation tube 3350 is manufactured
  • Tl the thickness of the tube 3350. as it exits extrusion head 3352, is equal to T2. the thickness of the tube 3350 at calibrator 3354. downstream of the extrusion head:
  • V2 multiplied by L/d, where L is the length of the drip insert 3356 and d is the desired
  • a series of drip inserts 3356 including a forward drip insert 3360 are in continuous linear motion at a generally uniform velocity V3 at all relevant times, here indicated by times tl , t2 and t3.
  • Fig. 43 A at time tl , the forward edge of a forward drip insert 3360 is seen approaching engagement with tube 3350. Thereafter, as seen in Fig. 43B, as the series of drip inserts 3356. including forward drip insert 3360 continue to move forward at time tl.
  • drip insert 3360 with tube 3350, the remaining drip inserts 3356, including a
  • next-in-line drip insert 3362 continue their forward motion at velocity V3, which is determined by the ratio of L and d, in order to achieve a desired spacing of drip inserts along the tube 3350.
  • velocity V3 is determined by the ratio of L and d, in order to achieve a desired spacing of drip inserts along the tube 3350.
  • forward drip insert 3360 moves forward at speed V2. which is substantially greater than V3 and thus becomes separated from the remaining drip inserts of series 3356.
  • Figs. 44A, 44B and 44C are simplified sectional illustrations of apparatus and a method for producing a drip
  • irrigation tube corresponding to the embodiment of Figs. 3 A. 3B and 3C, at three stages of carrying out of the method and wherein the linear feeding speed of a drip insert is generally constant.
  • a drip irrigation tube 3450 is manufactured under conditions wherein the following parameters are operative:
  • V2 the linear speed of the tube 3450 at a calibrator 3454, downstream of the extrusion head
  • the outer diameter of the tube 3450, as it exits extrusion head 3452, is smaller than D2.
  • a series of drip inserts 3456 including a forward drip insert 3460. are in continuous linear motion at a generally
  • Fig. 44A at time tl, the forward edge of a forward drip insert 3460 is seen approaching engagement with tube 3450. Thereafter, as seen in Fig. 44B, as the series of drip inserts 3456, including forward drip insert 3460 continue to move forward at linear velocity V3, forward drip insert 3460 moves into initial engagement with the tube 3450 at velocity V3.
  • drip insert 3460 with tube 3450, the remaining drip inserts 3456. including a next-in-line drip insert 3462. continue their forward motion at velocity V3, which is determined by the ratio of L and d. in order to achieve a desired spacing of drip inserts
  • a drip irrigation tube 3550 is manufactured under conditions wherein the following parameters are operative:
  • Tl the thickness of the tube 3550, as it exits extrusion head 3552, is less than T2, the thickness of the tube 3550 at calibrator 3554. downstream of the extrusion head;
  • V2 multiplied by L/d, where L is the length of the drip insert 3556 and d is the desired
  • a series of drip inserts 3556 including a forward drip insert 3560 are in continuous linear motion at a generally uniform velocity V3 at all relevant times, here indicated by times tl, t2 and t3.
  • V3 a generally uniform velocity
  • drip inserts 3556 including forward drip insert 3560 continue to move forward at linear velocity V3, forward drip insert 3560 moves into initial engagement with the tube 3550 at velocity V3.
  • Figs. 46A, 46B and 46C are simplified sectional illustrations of apparatus and a method for producing a drip irrigation tube corresponding to the embodiment of Figs. 5 A, 5B and 5C, at three
  • a drip irrigation tube 3650 is manufactured
  • V2 the linear speed of the tube 3650 at a calibrator 3654, downstream of the extrusion head
  • the outer diameter of the tube 3650, as it exits extrusion head 3652. is smaller than D2, the outer diameter of the tube 3650 at calibrator 3654, downstream of the extrusion head:
  • Tl the thickness of the tube 3650. as it exits extrusion head 3652, is greater than T2. the thickness of the tube 3650 at calibrator 3654, downstream of the extrusion head;
  • V3 the insertion speed of a drip insert 3656 into tube 3650 is equal to V2 multiplied by L/d.
  • L is the length of the drip insert 3656 and d is the desired spacing between centers of respective sequentially inserted drip inserts 3656 in tube 3650.
  • Fig. 46A it is seen that a series of drip inserts 3656
  • a forward drip insert 3660 including a forward drip insert 3660. are in continuous linear motion at a generally uniform velocity V3 at all relevant times, here indicated by times tl . t2 and t3.
  • drip inserts 3656. including forward drip insert 3660 continue to move forward at
  • forward drip insert 3660 moves forward at speed V2. which is substantially greater than V3 and thus becomes separated from the remaining drip inserts of series 3656.
  • irrigation tube corresponding to the embodiment of Figs. 6A, 6B and 6C, at three stages of carrying out of the method and wherein the linear feeding speed of a drip insert is generally constant.
  • a drip irrigation tube 3750 is manufactured under conditions wherein the following parameters are operative:
  • Tl the thickness of the tube 3750, as it exits extrusion head 3752, is less than T2. the thickness of the tube 3750 at calibrator 3754, downstream of the extrusion head;
  • the insertion speed of a drip insert 3756 into tube 3750 is equal to V2 multiplied by L/d.
  • L is the length of the drip insert 3756 and d is the desired spacing between centers of respective sequentially inserted drip inserts 3756 in tube 3750.
  • a series of drip inserts 3756 including a forward drip insert 3760. are in continuous linear motion at a generally
  • drip inserts 3756 including forward drip insert 3760 continue to move forward at linear velocity V3.
  • forward drip insert 3760 moves into initial engagement with the tube 3750 at velocity V3.
  • drip insert 3760 with tube 3750. the remaining drip inserts 3756. including a
  • next-in-line drip insert 3762. continue their forward motion at velocity V3. which is
  • Figs. 48 A, 48B and 48C are simplified sectional illustratior.s of apparatus and a method for producing a drip irrigation tube corresponding to the embodiment of Figs. 7A, 7B and 7C. at three stages of carrying out of the method and wherein the linear feeding speed of a drip insert is generally constant.
  • a drip irrigation tube 3850 is manufactured under conditions wherein the following parameters are operative:
  • Tl the thickness of the tube 3850. as it exits extrusion head 3852
  • a series of drip inserts 3856 including a forward drip insert 3860 are in continuous linear motion at a generally uniform velocity V3 at all relevant times, here indicated by times tl. t2 and t3.
  • Fig. 48 A at time tl, the forward edge of a forward drip insert 3860 is seen approaching engagement with tube 3850. Thereafter, as seen in Fig. 48B. as the series of drip inserts 3856. including forward drip insert 3860 continue to move forward at linear velocity V3. Forward drip insert 3860 moves into initial engagement with the tube 3850 at velocity V3.
  • drip insert 3860 with tube 3850, the remaining drip inserts 3856, including a
  • next-in-line drip insert 3862 continue their forward motion at velocity V3, which is
  • Figs. 49A. 49B and 49C are simplified sectional illustrations of apparatus and a method for producing a drip irrigation tube corresponding to the embodiment of Figs. 8 A, 8B and 8C, at three stages of carrying out of the method and wherein the linear feeding speed of a drip
  • a drip irrigation tube 3950 is manufactured
  • VI the linear speed of the tube 3950, as it exits an extrusion head 3952, is greater than V2. the linear speed of the tube 3950 at a calibrator 3954, downstream of the extrusion head;
  • Dl the outer diameter of the tube 3950, as it exits extrusion head 3952. is smaller than D2, the outer diameter of the tube 3950 at calibrator 3954, downstream of the extrusion head:
  • Tl the thickness of the tube 3950, as it exits extrusion head 3952, is less than T2. the thickness of the tube 3950 at calibrator 3954, downstream of the extrusion head;
  • a series of drip inserts 3956 including a forward drip insert 3960. are in continuous linear motion at a generally
  • drip inserts 3956 including forward drip insert 3960 continue to move forward at linear velocity V3.
  • forward drip insert 3960 moves into initial engagement with the tube 3950 at velocity V3.
  • drip insert 3960 with tube 3950, the remaining drip inserts 3956, including a next-in-line drip insert 3962. continue their forward motion at velocity V3, which is determined by the ratio of L and d. in order to achieve a desired spacing of drip inserts along the tube 3950.
  • velocity V3 is determined by the ratio of L and d. in order to achieve a desired spacing of drip inserts along the tube 3950.
  • forward drip insert 3960 moves forward at speed V2, which is
  • Figs. 50A. 50B and 50C are simplified sectional illustrations of apparatus and a method for producing a drip irrigation tube corresponding to the embodiment of Figs. 9A, 9B and 9C, at three stages of carrying out of the method and wherein the linear feeding speed of a drip
  • a drip irrigation tube 4050 is manufactured
  • Dl the outer diameter of the tube 4050, as it exits extrusion head 4052. is greater than D2, the outer diameter of the tube 4050 at calibrator 4054, downstream of the extrusion head;
  • Tl the thickness of the tube 4050. as it exits extrusion head 4052. is less than T2, the thickness of the tube 4050 at calibrator 4054, downstream of the extrusion head;
  • the insertion speed of a drip insert 4056 into tube 4050 is equal to V2 multiplied by L/d, where L is the length of the drip insert 4056 and d is the desired spacing between centers of respective sequentially inserted drip inserts 4056 in tube 405 ⁇ .
  • Fig. 50A it is seen that a series of drip inserts 4056
  • a forward drip insert 4060 are in continuous linear motion at a generally
  • drip insert 4060 with tube 4050, the remaining drip inserts 4056, including a next-in-line drip insert 4062, continue their forward motion at velocity V3, which is
  • forward drip insert 4060 moves forward at speed V2. which is substantially greater than V3 and thus becomes separated from the remaining drip inserts of series 4056.
  • a drip irrigation tube 4150 is manufactured under conditions wherein the following parameters are operative:
  • Tl the thickness of the tube 4150. as it exits extrusion head 4152. is greater than T2. the thickness of the tube 4150 at calibrator 4154, downstream of the
  • the insertion speed of a drip insert 4156 into tube 4150 is equal to V2 multiplied by L/d.
  • L is the length of the drip insert 4156 and d is the desired spacing between centers of respective sequentially inserted drip inserts 4156 in tube 4150.
  • a series of drip inserts 4156 including a forward drip insert 4160 are in continuous linear motion at a generally uniform velocity V3 at all relevant times, here indicated by times tl . t2 and t3.
  • next-in-line drip insert 4162 continue their forward motion at velocity V3, which is
  • forward drip insert 4160 moves forward at speed V2. which is substantially greater than V3 and thus becomes separated from the remaining drip inserts of series 4156.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)

Abstract

Cette invention concerne un dispositif et un procédé de fabrication de tuyaux en plastiques (12). Ce procédé consiste à extruder un tuyau de plastique (12) à partir d'une tube d'extrusion (10), ce tuyau (12) présentant à sa sortie et en aval de la tête d'extrusion (10) une première section en coupe, puis une seconde section en coupe plus importante que la première.
PCT/IL2001/000060 2000-02-02 2001-01-22 Fabrication d'un dispositif d'arrosage par goutte-a-goutte WO2001056768A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2001227026A AU2001227026A1 (en) 2000-02-02 2001-01-22 Manufacture of drip irrigation apparatus

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US49673800A 2000-02-02 2000-02-02
US09/496,738 2000-02-02

Publications (1)

Publication Number Publication Date
WO2001056768A1 true WO2001056768A1 (fr) 2001-08-09

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AU (1) AU2001227026A1 (fr)
WO (1) WO2001056768A1 (fr)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10285342B2 (en) 2013-08-12 2019-05-14 Rain Bird Corporation Elastomeric emitter and methods relating to same
US10330559B2 (en) 2014-09-11 2019-06-25 Rain Bird Corporation Methods and apparatus for checking emitter bonds in an irrigation drip line
US10375904B2 (en) 2016-07-18 2019-08-13 Rain Bird Corporation Emitter locating system and related methods
US10420293B2 (en) 2013-10-22 2019-09-24 Rain Bird Corporation Methods and apparatus for transporting emitters and/or manufacturing drip line
US10440903B2 (en) 2012-03-26 2019-10-15 Rain Bird Corporation Drip line emitter and methods relating to same
US10626998B2 (en) 2017-05-15 2020-04-21 Rain Bird Corporation Drip emitter with check valve
US10631473B2 (en) 2013-08-12 2020-04-28 Rain Bird Corporation Elastomeric emitter and methods relating to same
USD883048S1 (en) 2017-12-12 2020-05-05 Rain Bird Corporation Emitter part
US10842090B2 (en) 2006-02-22 2020-11-24 Rain Bird Corporation Drip emitter
US11051466B2 (en) 2017-01-27 2021-07-06 Rain Bird Corporation Pressure compensation members, emitters, drip line and methods relating to same
US11185021B2 (en) 2012-03-26 2021-11-30 Rain Bird Corporation Elastomeric emitter and methods relating to same
US11985924B2 (en) 2018-06-11 2024-05-21 Rain Bird Corporation Emitter outlet, emitter, drip line and methods relating to same

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1370854A (en) * 1971-05-26 1974-10-16 Armosig Assembly and process for manufacturing tubes of pvc and tubes obtained by the process
EP0344605A2 (fr) * 1988-05-30 1989-12-06 Hydro-Plan Engineering Ltd. Procédé et installation de fabrication d'une conduite d'irrigation au goutte-à-goutte
EP0446416A2 (fr) * 1990-03-16 1991-09-18 Nkk Corporation Procédé d'extrusion d'un tuyau en résine thermoplastique
FR2716835A1 (fr) * 1994-03-01 1995-09-08 Itep Int Procédé de fabrication d'un tuyau poreux, tuyau poreux obtenu par ledit procédé et utilisation d'un tel tuyau en irrigation.
EP0872172A1 (fr) * 1997-04-18 1998-10-21 Swisscab S.A. Procédé de fabrication d'un tuyau d'irrigation goutte-à-goutte et goutteur utilisé dans ce tuyau
WO1999062691A1 (fr) * 1998-06-01 1999-12-09 Amir Cohen Procede et appareil pour former des canalisations a goutteurs
EP0970602A1 (fr) * 1998-07-08 2000-01-12 Swisscab S.A. Procédé de fabrication d'un tuyau goutte-à-goutte, ligne de fabrication pour sa mise en oeuvre et tuyau obtenu par ce procédé

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1370854A (en) * 1971-05-26 1974-10-16 Armosig Assembly and process for manufacturing tubes of pvc and tubes obtained by the process
EP0344605A2 (fr) * 1988-05-30 1989-12-06 Hydro-Plan Engineering Ltd. Procédé et installation de fabrication d'une conduite d'irrigation au goutte-à-goutte
EP0446416A2 (fr) * 1990-03-16 1991-09-18 Nkk Corporation Procédé d'extrusion d'un tuyau en résine thermoplastique
FR2716835A1 (fr) * 1994-03-01 1995-09-08 Itep Int Procédé de fabrication d'un tuyau poreux, tuyau poreux obtenu par ledit procédé et utilisation d'un tel tuyau en irrigation.
EP0872172A1 (fr) * 1997-04-18 1998-10-21 Swisscab S.A. Procédé de fabrication d'un tuyau d'irrigation goutte-à-goutte et goutteur utilisé dans ce tuyau
WO1999062691A1 (fr) * 1998-06-01 1999-12-09 Amir Cohen Procede et appareil pour former des canalisations a goutteurs
EP0970602A1 (fr) * 1998-07-08 2000-01-12 Swisscab S.A. Procédé de fabrication d'un tuyau goutte-à-goutte, ligne de fabrication pour sa mise en oeuvre et tuyau obtenu par ce procédé

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10842090B2 (en) 2006-02-22 2020-11-24 Rain Bird Corporation Drip emitter
US11185021B2 (en) 2012-03-26 2021-11-30 Rain Bird Corporation Elastomeric emitter and methods relating to same
US10440903B2 (en) 2012-03-26 2019-10-15 Rain Bird Corporation Drip line emitter and methods relating to same
US10631473B2 (en) 2013-08-12 2020-04-28 Rain Bird Corporation Elastomeric emitter and methods relating to same
US10285342B2 (en) 2013-08-12 2019-05-14 Rain Bird Corporation Elastomeric emitter and methods relating to same
US10420293B2 (en) 2013-10-22 2019-09-24 Rain Bird Corporation Methods and apparatus for transporting emitters and/or manufacturing drip line
US11422055B2 (en) 2014-09-11 2022-08-23 Rain Bird Corporation Methods and apparatus for checking emitter bonds in an irrigation drip line
US10330559B2 (en) 2014-09-11 2019-06-25 Rain Bird Corporation Methods and apparatus for checking emitter bonds in an irrigation drip line
US10750684B2 (en) 2016-07-18 2020-08-25 Rain Bird Corporation Emitter locating system and related methods
US10375904B2 (en) 2016-07-18 2019-08-13 Rain Bird Corporation Emitter locating system and related methods
US11051466B2 (en) 2017-01-27 2021-07-06 Rain Bird Corporation Pressure compensation members, emitters, drip line and methods relating to same
US12041889B2 (en) 2017-01-27 2024-07-23 Rain Bird Corporation Pressure compensation members, emitters, drip line and methods relating to same
US10626998B2 (en) 2017-05-15 2020-04-21 Rain Bird Corporation Drip emitter with check valve
USD883048S1 (en) 2017-12-12 2020-05-05 Rain Bird Corporation Emitter part
USD978637S1 (en) 2017-12-12 2023-02-21 Rain Bird Corporation Emitter part
US11985924B2 (en) 2018-06-11 2024-05-21 Rain Bird Corporation Emitter outlet, emitter, drip line and methods relating to same

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