US3895085A - Process for preparing a synthetic floating pipe - Google Patents

Process for preparing a synthetic floating pipe Download PDF

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Publication number
US3895085A
US3895085A US393190A US39319073A US3895085A US 3895085 A US3895085 A US 3895085A US 393190 A US393190 A US 393190A US 39319073 A US39319073 A US 39319073A US 3895085 A US3895085 A US 3895085A
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United States
Prior art keywords
pipe
plates
separating plates
perforations
extruded
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Expired - Lifetime
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US393190A
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English (en)
Inventor
Todao Suzuki
Hiroshi Maruyama
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Maruhachi Kasei Kogyo KK
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Maruhachi Kasei Kogyo KK
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Application filed by Maruhachi Kasei Kogyo KK filed Critical Maruhachi Kasei Kogyo KK
Priority to US518971A priority Critical patent/US3905749A/en
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Publication of US3895085A publication Critical patent/US3895085A/en
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Expired - Lifetime legal-status Critical Current

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    • 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
    • B29C48/16—Articles comprising two or more components, e.g. co-extruded layers
    • B29C48/18—Articles comprising two or more components, e.g. co-extruded layers the components being layers
    • B29C48/21—Articles comprising two or more components, e.g. co-extruded layers the components being layers the layers being joined at their surfaces
    • 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
    • B29C48/001—Combinations of extrusion moulding with other shaping operations
    • B29C48/0013—Extrusion moulding in several steps, i.e. components merging outside the die
    • B29C48/0015—Extrusion moulding in several steps, i.e. components merging outside the die producing hollow articles having components brought in contact outside the extrusion die
    • B29C48/0016—Extrusion moulding in several steps, i.e. components merging outside the die producing hollow articles having components brought in contact outside the extrusion die using a plurality of extrusion dies
    • 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
    • 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
    • B29C48/154—Coating solid articles, i.e. non-hollow articles
    • 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
    • B29C48/03—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
    • B29C48/03—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
    • B29C48/13—Articles with a cross-section varying in the longitudinal direction, e.g. corrugated pipes

Definitions

  • a perforating means perforates the wall of the first pipe, between the plates thus forming a communication between the atmosphere and the chamber. This eliminates the deformation of the pipe which would be caused if the chamber were sealed from the atmosphere.
  • a second pipe is extruded around the first pipe in contact therewith in order to cover the first pipe and thus cover the perforations. In this manner, a closed pipe is formed which is suitable for use as a float.
  • the insertion of the separating plates is conducted in such a manner that a ridge is formed at the point of insertion. This is the finished pipe, a plurality of circumferential ridges at predetermined lengths giving an appearance similar to bamboo.
  • a synthetic floating pipe which contains separating plates therein is meant a pipe which has a structure resembling a bamboo, i.e. a pipe having therein a number of compartments or chambers which are air-tightly separated from each other by plates inserted into the pipe.
  • the compartments or chambers never permit water to penetrate thereinto, and therefore the syn thetic floating pipe has the characteristic of considerable buoyancy in water.
  • the inventor has attempted to prepare the synthetic floating pipe by inserting a number of separating plates into a thermoplastic resin pipe in the process of extrusion.
  • the inventor has filed a utility model application in connection with an apparatus for preparing the article in Japan, which was published under the Japanese utility model publication No. 45-33897. Consequently, the principle of a method for preparing the synthetic floating pipe has already been known.
  • the present invention has been made by adding an improvement to the known principle.
  • Japanese utility model publication No. 45-33897 discloses an apparatus which comprises mounting on the forward end of an extruder a cross-head die for use in extruding a pipe, providing an inner mold of said die with an aperture extending through the inner mold in the extruding direction, mounting a means for inserting separating plates on said die on the side opposite to the extruding direction, communicating said aperture with an interior cavity of the means, and providing a rod for inserting the plates which reciprocate between the cavity of the means and the aperture. It is possible to continuously prepare a pipe having separating plates therein by means of said apparatus. This is especially true when the separating plates are used, each of which has a perforation extending through the wall thereof.
  • the present invention aims to produce the synthetic pipe for use in floats by improving over the drawbacks and avoiding the deficiencies and disadvantages of the past.
  • the present invention is based upon the principle that minute perforations are provided in a pipe during a process of manufacturing the pipe by extruding synthetic thermoplastic resin, so that the air can penetrate into each of the airtight compartments or chambers which are formed by fixing separating plates to the inner surface of the pipe. Subsequently, the thus obtained pipe is covered over the entire outer surface thereof, with another synthetic thermoplastic pipe extruded from an extruder so as to close the minute perforations.
  • the present invention provides a process and apparatus for preparing a synthetic pipe containing separating plates therein for use in floats and which comprises inserting a number of thermoplastic resin plates into a thermoplastic resin pipe at certain intervals and fixing the plates tightly to the inner surface of the pipe, while the pipe is being extruded from a die mounted on an extruder, providing the pipe with a plurality of perforations having a minute diameter and extending through the width of the pipe while the pipe is still heated and in a softened state so that each of the compartments or chambers formed in the pipe by the plates may be communicated with the outer atmosphere through the perforations, extruding another thermoplastic resin pipe around said pipe so as to cover said pipe, and contacting both pipes closely so that the perforations are closed by the other pipe.
  • FIG. I is a schematical plan view of one embodiment of the process wherein extruders and pipes are partly cut away.
  • FIG. 2 is a sectional view of a die for extruding another thermoplastic resin pipe around a perforated pipe, wherein perforation is not shown.
  • FIG. 3 is a sectional view of a die for extruding a thermoplastic resin pipe and inserting the separating plates in the pipe.
  • cross-head die 2 is mounted on the forward end of extruder l, and inserting means 3 is mounted on cross-head die 2 in order to transfer the separating plates to pipe a extruded from die 2.
  • pipe a is perforated by piercing means 5 to have minute pin holes extending through the thickness of the pipe.
  • Pipe a is then cooled in the air and pulled by take-up rolls 6.
  • pipe a is further introduced into cross-head die 8 mounted on extruder 7.
  • pipe a is covered with another pipe over the entire outer surface of pipe a in cross-head die 8 to form one pipe b, as the result the perforations are closed.
  • Pipe [2 is cooled in cooling box 9, then is pulled by take-up rolls 10.
  • a pipe having separating plates therein is formed in the following manner: Molten resin is extruded in the form of a pipe from cross-head die 2 mounted on extruder l. Separating plates are preformed so as to have such sufficient dimensions that the plates extend across the diameter and are stored in inserting means 3. The separating plates are intermittently transferred into the pipe through cross-head die 2 by means of inserting means 3. Since the pipe extruded from die 2 is in a softened state, the separating plates are allowed to contact closely with inner surface of the pipe, and therefore there are formed in the pipe a number of compartments or chambers which are airtightly separated by the separating plates. The pipe is advanced onto rolls 4. In the meantime, the pipe is exposed to the air, and is therefore gradually cooled.
  • the pipe is provided with perforations which have minute diameters and extend through wall of the pipe.
  • the perforations are produced by instantaneously piercing the pipe with a needle mounted on the forward end of piercing means 5.
  • pipe a should have at least one perforation in every compartment or chamber. These perforations have a diameter almost equal to the outside diameter of the piercing needle.
  • Pipe a is cooled in the air to have such a hardness that it can maintain its shape as a pipe, and then pipe a is caught between take-up rolls 6.
  • pipe After passing take up rolls 6, pipe is introduced into cross-head die 8 mounted on the second extruder 7.
  • cross-head die 8 pipe a is covered with another pipe of thermoplastic resin extruded from extruder 7.
  • this additional pipe covers pipe a over the entire outer surface thereof, said perforations are closed by the additional pipe, and thus is obtained pipe b which has separating plates and no perforations on the outer surface thereof.
  • FIG. 2 shows the mode of a preferable covering process.
  • thermoplastic resin is extruded from the second extruder 7 into passage 81, and then is extruded from die 8 in the form of pipe 82.
  • Pipe 82 is the other or additional pipe which is to cover pipe a.
  • Tube 83 is connected to a vacuum pump which is not shown, and tube 83 is to discharge the air between pipe 0 and the inner wall sur rounding pipe a in crosshead die 8.
  • packing 84 is provided in order to prevent the air from flowing into die 8 through the opening existing on the inlet side of pipe 0.
  • packing 84 is composed of several sheets of packing materials which are arranged at short dis tanccs.
  • pipe a is at first prepared such that a number of separating plates are closely fixed to the inner surface of the pipe 0.
  • pipe 0 is then provided with perforations in each of the compartments or chambers confined by the separating plates, so that the air can penetrate into each of the compartments. Consequently pipe a does not give rise to any unexpected deformation.
  • the covering pipe is formed on pipe 0, and the resultant pipe b does not give rise to any unexpected deformation even when pipe b is cooled by contacting with water in cooling box 9 and pulled by take-up rolls 10, because pipe 0 is able to maintain the shape of the combination pipe.
  • a pipe is obtained which has a number of separating plates air-tightly fixed to the interior of the pipe, and is identified as a synthetic floating pipe containing separating plates therein.
  • the separating plates can be firmly fixed to predetermined positions and the resultant pipe does not give rise to any unexpected deformation, though the separating plates are inserted into the pipe which is being extruded from the die mounted on an extruder, and the plates are airtightly fixed to the inner surface of the pipe.
  • the process enables the production of a synthetic floating pipe containing separating plates therein and which has a desired predetermined shape. Further, two extrusion steps are carried out in this process, and therefore material of the outer pipe may be varied from that of the inner pipe, thus the resultant pipe product may be imparted with a peculiar characteristic by combination of two materials.
  • both pipes can be adhered so intimately that both pipes are never separated.
  • the perforations provided in pipe a are so minute in diameter that they can be entirely closed by subsequently overlaying pipe a with a covering pipe, and they thus, leave no observable trace or appearance.
  • Insertion of the separating plates into the pipe are carried out by means of the following die: in FIG. 3, molten resin is extruded from extruder l and introduced into die 2.
  • Die 2 is constructed with outer mold 27 and inner mold 28, between which a tubular passage is formed which starts from 23, through 24 and 25 and ends at 26.
  • Inner mold 28 is provided with aperture 29 which is to pass the separating plates.
  • Molten resin is introduced from portion 21, passed through passage 22, and brought to tubular passage 23.
  • Passage 22 is composed of two portions, each of which goes round by half of circumference of aperture 29 to communicate with passage 23, with gradually increasing the width and gradually changing the advancing direction perpendicularly.
  • Passage 23, 24 and 25 are gradually decreased in thickness in the advancing direction.
  • Forward end of inner mold 28 is located inwardly in relation to forward end of outer mold 27.
  • Separating plates are inserted into the pipe by the following manner: in FIG. 3, separating plates x are at first stored in case 31, and are heated at the sides thereof by heater 32, and are transferred one by one to inserting case 34 by transferring rod 33.
  • One separating plate x is fixed to suction disk 36 mounted on inserting rod 35 in inserting compartment 34.
  • Separating plate x fixed to suction disk 36 is transferred to die 2 by inserting rod 35. While transferred, the separating plate x is further heated at the sides in aperture 29.
  • separating plate x is passed through aperture 29 of inner mold 28 and is inserted into the pipe which is still in contact with inner surface of outer mold 27. At this time, suction from the suction disk is stopped by a means which is not shown in FIG. 3. Thereafter, inserting rod 35 is withdrawn from die 2.
  • separating plates are provided with the pipe at certain intervals by repeating motions as stated above.
  • the separating plates can be more firmly fixed to the inner surface of the pipe in the following manner: one method is to pinch and compress the pipe by paired rolls immediately after the pipe has been provided with the separating plates. Further, another method is to use the separating plates having the diameter a little larger than inner diameter of the pipe and to forcibly insert the plate into the pipe, or to heat the sides of the plate prior to the insertion.
  • a perforating means may be, for example, constructed by providing the forward end of a reciprocating rod with a needle, the needle piercing the pipe when the rod is advanced to the pipe.
  • electromagnets or combination of electro-magnets and springs it is preferable to use electromagnets or combination of electro-magnets and springs. The perforations will be sufficient, if only one or two perforations having l-2 mm in diameter are provided for each compartment, for example, having a 4 cm inside diameter and a cm inside length.
  • the pipe a formed by the first extrusion (hereinafter referred to as the first pipe) is norm ally made to have a little larger thickness than that of the pipe formed by the second extrusion (hereinafter referred to as the second pipe).
  • the first pipe is increased in the thickness, the pipe does not show remarkable protrusions which occur on account of the separating plates. Therefore, in order to make the protrusions more noticeable, it is not advantageous to increase the first pipe too much in thickness.
  • the first pipe is made to have 2 mm in thickness
  • the second pipe is made to have about 1 mm in thickness.
  • a final pipe can be obtained which is about 3 mm in thickness, and has remarkable and beautiful protrusions which give the appearance of bamboo. Therefore, the final pipe obtained by this process is superior to all pipes which are manufactured by conventional methods.
  • a method of preparing a synthetic pipe for use in a float comprising:
  • fixing said plates includes pinching said first pipe immediately after said separating plates have been inserted.
  • fixing said plates includes heating the edges of said plate prior to insertion in said first pipe.
US393190A 1972-08-31 1973-08-30 Process for preparing a synthetic floating pipe Expired - Lifetime US3895085A (en)

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US518971A US3905749A (en) 1972-08-31 1974-10-29 Apparatus for preparing a synthetic floating pipe

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JP47087673A JPS5146530B2 (xx) 1972-08-31 1972-08-31

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GB (1) GB1430771A (xx)

Cited By (37)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4113890A (en) * 1975-12-11 1978-09-12 Marlen Research Corporation Method of cooking a flowable food product in a continuous flow scraped surface heat exchanger
US4345363A (en) * 1978-09-08 1982-08-24 Kabel Und Metallwerke Gutehoffnungshutte Ag Method of continuously making flexible, heat insulated metal tubing
US4386996A (en) * 1980-03-07 1983-06-07 Mannesmann Aktiengesellschaft Apparatus for the jacketing of steel pipes
US4413912A (en) * 1981-05-16 1983-11-08 Bayer Aktiengesellschaft Apparatus for the production of a reaction mixture
US4451413A (en) * 1980-12-12 1984-05-29 Mannesmann Ag Jacketing steel tubes and pipes
US4647416A (en) * 1983-08-03 1987-03-03 Shiley Incorporated Method of preparing a vascular graft prosthesis
US4929408A (en) * 1986-09-30 1990-05-29 Bernhard Lodder Method of locating an electrical conductor between a first extruded tube and an extruded lining
US5022940A (en) * 1988-05-30 1991-06-11 Hydro-Plan Engineering Ltd. Process of making a drip irrigation conduit
US5047193A (en) * 1987-03-12 1991-09-10 Isaac Rinkewich Method and apparatus for making honeycomb structures
US5271786A (en) * 1990-10-12 1993-12-21 Naan Irrigation Systems Method and apparatus for producing pipes for drip irrigation
US5324371A (en) * 1988-05-30 1994-06-28 Hydro-Plan Engineering Ltd. Process for producing a drip irrigation conduit
US5676897A (en) * 1990-10-03 1997-10-14 Dermitzakis; Emmanuil Dripline duct with internally located emiters and manufacture process
US6039270A (en) * 1990-10-03 2000-03-21 Dermitzakis; Emmanuil Manufacture process for a dripline duct with internally located emitters
US6120634A (en) * 1997-02-26 2000-09-19 Micro Irrigation Technologies, Inc. Method and apparatus for forming agricultural drip tape
US6568607B2 (en) 2001-03-16 2003-05-27 The Toro Company Emitter
US6620278B1 (en) 2000-04-18 2003-09-16 Nelson Irrigation Corporation Drip tape manufacturing process
EP1602273A1 (fr) * 2004-06-03 2005-12-07 Eberhard Kertscher Installation de fabrication de tuyaux d'irrigation goutte à goutte
US20050284966A1 (en) * 2004-06-23 2005-12-29 Defrank Michael Emitter
US20080099584A1 (en) * 2004-09-02 2008-05-01 Netafim Ltd. Drip Irrigation pipe
US20090200694A1 (en) * 2008-02-11 2009-08-13 Advanced Drainage Systems, Inc. Extrusion die vacuum seals and methods
US20100282873A1 (en) * 2009-05-06 2010-11-11 Mattlin Jeffrey L Drip Emitter and Methods of Assembly and Mounting
US8302887B2 (en) 2005-03-31 2012-11-06 Rain Bird Corporation Drip emitter
US9485923B2 (en) 2012-03-26 2016-11-08 Rain Bird Corporation Elastomeric emitter and methods relating to same
US9743595B2 (en) 2006-02-22 2017-08-29 Rain Bird Corporation Drip emitter
US9872444B2 (en) 2013-03-15 2018-01-23 Rain Bird Corporation Drip emitter
US9877440B2 (en) 2012-03-26 2018-01-30 Rain Bird Corporation Elastomeric emitter and methods relating to same
US9877442B2 (en) 2012-03-26 2018-01-30 Rain Bird Corporation Drip line and emitter and methods relating to same
US9883640B2 (en) 2013-10-22 2018-02-06 Rain Bird Corporation Methods and apparatus for transporting elastomeric emitters and/or manufacturing drip lines
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US10285342B2 (en) 2013-08-12 2019-05-14 Rain Bird Corporation Elastomeric emitter and methods relating to same
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US10440903B2 (en) 2012-03-26 2019-10-15 Rain Bird Corporation Drip line emitter and methods relating to same
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US10631473B2 (en) 2013-08-12 2020-04-28 Rain Bird Corporation Elastomeric emitter and methods relating to same
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Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ATE3385T1 (de) * 1978-08-02 1983-06-15 Bicc Limited Herstellung von extrudierten produkten.
GB2202484B (en) * 1987-03-20 1990-08-15 Keith Richard Patterson Improvements relating to tubular extrusions
JPH0789040B2 (ja) * 1987-10-22 1995-09-27 日立造船株式会社 静止式水雷

Citations (1)

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US2599493A (en) * 1945-02-02 1952-06-03 Extruded Plastics Inc Packaging method

Patent Citations (1)

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US2599493A (en) * 1945-02-02 1952-06-03 Extruded Plastics Inc Packaging method

Cited By (49)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4113890A (en) * 1975-12-11 1978-09-12 Marlen Research Corporation Method of cooking a flowable food product in a continuous flow scraped surface heat exchanger
US4345363A (en) * 1978-09-08 1982-08-24 Kabel Und Metallwerke Gutehoffnungshutte Ag Method of continuously making flexible, heat insulated metal tubing
US4386996A (en) * 1980-03-07 1983-06-07 Mannesmann Aktiengesellschaft Apparatus for the jacketing of steel pipes
US4451413A (en) * 1980-12-12 1984-05-29 Mannesmann Ag Jacketing steel tubes and pipes
US4413912A (en) * 1981-05-16 1983-11-08 Bayer Aktiengesellschaft Apparatus for the production of a reaction mixture
US4647416A (en) * 1983-08-03 1987-03-03 Shiley Incorporated Method of preparing a vascular graft prosthesis
US4929408A (en) * 1986-09-30 1990-05-29 Bernhard Lodder Method of locating an electrical conductor between a first extruded tube and an extruded lining
US5047193A (en) * 1987-03-12 1991-09-10 Isaac Rinkewich Method and apparatus for making honeycomb structures
US5324371A (en) * 1988-05-30 1994-06-28 Hydro-Plan Engineering Ltd. Process for producing a drip irrigation conduit
US5022940A (en) * 1988-05-30 1991-06-11 Hydro-Plan Engineering Ltd. Process of making a drip irrigation conduit
US5122044A (en) * 1988-05-30 1992-06-16 Hydro-Plan Engineering Ltd. Apparatus for making a drip irrigation conduit
US5676897A (en) * 1990-10-03 1997-10-14 Dermitzakis; Emmanuil Dripline duct with internally located emiters and manufacture process
US6039270A (en) * 1990-10-03 2000-03-21 Dermitzakis; Emmanuil Manufacture process for a dripline duct with internally located emitters
US5271786A (en) * 1990-10-12 1993-12-21 Naan Irrigation Systems Method and apparatus for producing pipes for drip irrigation
US6920907B2 (en) 1997-02-26 2005-07-26 Nelson Irrigation Corporation Apparatus for forming agricultural drip tape
US6543509B1 (en) 1997-02-26 2003-04-08 Nelson Irrigation Corporation Apparatus for forming agricultural drip tape
US6120634A (en) * 1997-02-26 2000-09-19 Micro Irrigation Technologies, Inc. Method and apparatus for forming agricultural drip tape
US6620278B1 (en) 2000-04-18 2003-09-16 Nelson Irrigation Corporation Drip tape manufacturing process
US6568607B2 (en) 2001-03-16 2003-05-27 The Toro Company Emitter
EP1602273A1 (fr) * 2004-06-03 2005-12-07 Eberhard Kertscher Installation de fabrication de tuyaux d'irrigation goutte à goutte
US20050284966A1 (en) * 2004-06-23 2005-12-29 Defrank Michael Emitter
US20080099584A1 (en) * 2004-09-02 2008-05-01 Netafim Ltd. Drip Irrigation pipe
US8302887B2 (en) 2005-03-31 2012-11-06 Rain Bird Corporation Drip emitter
US10842090B2 (en) 2006-02-22 2020-11-24 Rain Bird Corporation Drip emitter
US9743595B2 (en) 2006-02-22 2017-08-29 Rain Bird Corporation Drip emitter
US7988438B2 (en) * 2008-02-11 2011-08-02 Advanced Drainage Systems, Inc. Extrusion die vacuum seals
US20090200694A1 (en) * 2008-02-11 2009-08-13 Advanced Drainage Systems, Inc. Extrusion die vacuum seals and methods
US20100282873A1 (en) * 2009-05-06 2010-11-11 Mattlin Jeffrey L Drip Emitter and Methods of Assembly and Mounting
US10440903B2 (en) 2012-03-26 2019-10-15 Rain Bird Corporation Drip line emitter and methods relating to same
US9877440B2 (en) 2012-03-26 2018-01-30 Rain Bird Corporation Elastomeric emitter and methods relating to same
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Also Published As

Publication number Publication date
JPS4942760A (xx) 1974-04-22
JPS5146530B2 (xx) 1976-12-09
FR2197713B1 (xx) 1976-05-14
FR2197713A1 (xx) 1974-03-29
GB1430771A (en) 1976-04-07

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