WO2004033186A1 - Apparatus and method for a one-step plastic pipe production - Google Patents

Apparatus and method for a one-step plastic pipe production Download PDF

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Publication number
WO2004033186A1
WO2004033186A1 PCT/IB2002/003975 IB0203975W WO2004033186A1 WO 2004033186 A1 WO2004033186 A1 WO 2004033186A1 IB 0203975 W IB0203975 W IB 0203975W WO 2004033186 A1 WO2004033186 A1 WO 2004033186A1
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WO
WIPO (PCT)
Prior art keywords
unit
plastic
kneader
melted
pipe
Prior art date
Application number
PCT/IB2002/003975
Other languages
French (fr)
Inventor
Hudaverdi Ugurlu
Ismail Teke
Savval Memmetof
Mehmet Ali Gurkaynak
Ahmet Koyun
Sacit Beyenal
Original Assignee
Dizayn Teknik Plastik Boru Elemanlari Sanayi Ve Tic. A.S.
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 Dizayn Teknik Plastik Boru Elemanlari Sanayi Ve Tic. A.S. filed Critical Dizayn Teknik Plastik Boru Elemanlari Sanayi Ve Tic. A.S.
Priority to AU2002341244A priority Critical patent/AU2002341244A1/en
Priority to PCT/IB2002/003975 priority patent/WO2004033186A1/en
Publication of WO2004033186A1 publication Critical patent/WO2004033186A1/en

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B7/00—Mixing; Kneading
    • B29B7/002—Methods
    • B29B7/007—Methods for continuous mixing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B9/00—Making granules
    • 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
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
    • B29C48/365—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using pumps, e.g. piston pumps
    • B29C48/37—Gear pumps
    • 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
    • B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
    • B29C48/375—Plasticisers, homogenisers or feeders comprising two or more stages
    • B29C48/387—Plasticisers, homogenisers or feeders comprising two or more stages using a screw extruder and a gear pump
    • 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
    • B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
    • B29C48/395—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using screws surrounded by a cooperating barrel, e.g. single screw extruders
    • 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
    • B29C48/285—Feeding the extrusion material to the extruder
    • B29C48/288—Feeding the extrusion material to the extruder in solid form, e.g. powder or granules
    • 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
    • B29C48/285—Feeding the extrusion material to the extruder
    • B29C48/297—Feeding the extrusion material to the extruder at several locations, e.g. using several hoppers or using a separate additive feeding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
    • B29K2105/0005—Condition, form or state of moulded material or of the material to be shaped containing compounding ingredients

Definitions

  • Present invention relates to a kneader unit where granulated plastic mixtures for plastic pipes are produced, whereas more attention is paid particularly to a 5 coupled production line in which only such a kneader unit, a mold unit where pipes are shaped, and a pump unit embodied between such units are included by removing the extruder unit where the granulated mixtures obtained by melting and solidifying plastic and additives (in said kneader unit) are melted again.
  • plastic based pipes comprises generally two phases.
  • plastic raw material polymer
  • additives reinforcing pipes' physical properties in a kneader unit and thus a granulated mixture is produced.
  • the kneader unit functions as a unit where plastic raw material and additives are brought together and a homogeneous plastic based mixture is
  • the working principle of such an extruder line is based on melting back a granulated mixture from a kneader unit and on giving a desired shape to such melted plastic mixtures.
  • the melted material is formed by means of resistance elements located within the extruder unit and is exposed to high pressure and 25 temperature in the extruder in order to obtain any desired shape.
  • the temperature is controlled by cooling from the exterior of the metal parts of the extruder. On cooling said metal parts, however, the melted material in contact with such parts starts to cool earlier than the remaining melted plastic material so as to cause an uneven cooling and consequently, the mixture of polymer raw material and additives does not become homogeneous. As a result of this circumstance, significant losses happen in mechanical properties of the raw material of a pipe to be produced.
  • the object of the present invention is to perform a one-phased plastic-based pipe production process.
  • Another object of the present invention is to preserve the mechanical properties of a plastic based pipe product.
  • Yet another objective of the present invention is to lower down the cost of the plastic-based pipe production process.
  • the kneader based plastic pipe production line under the present invention comprises three main units.
  • the first unit is the kneader unit where polymer as a raw material of plastic is mixed with additives.
  • the second unit is a pump unit (preferably a gear pump) which provides high pressure in order to transmit the melted plastic mixture formed in the kneader unit to the molding unit.
  • the third unit is the molding unit where the plastic pipe is given any desired shape.
  • the present invention is a production line in which a kneader unit, a pump, and a molding unit is included and in which the extruder unit towards known extruder- based plastic pipe processes is eliminated.
  • Said pump embodied as the second unit provides high pressure so that the melted plastic mixture within the kneader unit is transmitted to the molding unit to be given any desired shape therein.
  • any plastic mixture homogenized by melting in the kneader unit is -by means of a pump (preferably a gear pump) coupled to said kneader unit- sent to the rolling unit where any desired pipe shape is obtained and whereto said gear pump is connected.
  • a pump preferably a gear pump
  • Figure 1 gives a perspective view of the kneader-based pipe production line embodied under the present invention.
  • Figure 1 shows the kneader-based plastic pipe production line under the present invention.
  • Polymer material that is entering to the kneader unit (1) via the plastic raw material funnel (4) is melted together with additives entering from the mixture material funnels (5, 6) by means of friction caused by the screw present in the kneader unit (1 ) and a plastic-based mixture is formed with a homogeneous structure.
  • the melted plastic mixture is transmitted to the pump unit (2) connected to the kneader unit (1) by means of a screw mechanism present in the kneader unit (1).
  • This pump (2) is a gear pump under a preferred embodiment of the present invention. Since the pressure of the melted plastic based material within the kneader unit (1 ) is lower than the pressure required to create a pipe form, such a gear pump (2) is utilized. Since this gear pump (2) conveys the melted material to the molding unit (3) at a constant flow rate, the waving flow is stabilized and the desired mechanical properties of such product is preserved.
  • the melted plastic based material passing with a certain pressure from the outlet (8) of the gear pump (2) is sent to the molding unit (3) where a pipe form is given and any desired shape is given in this unit.
  • the pipe leaving the molding unit (3) is cooled by passing through a basin and is sent to the cutting element by means of a drawing element to be brought to its final shape.
  • the kneader unit in the pipe production line according to the present invention can alternatively realize pipe production by one line and can optionally perform granulated mixture production on another line.
  • a number of rolling unit (3) can be fed with melted plastic material by a distribution element such as a manifold positioned on the end of the gear pump's (2) outlet (8) and thus, multiple pipe production can be realized with multiple rolling units (3) in one phase.
  • the coupled plastic pipe production line under the present invention presents also an approach where pipe production is realized with only one phase, comprising the following steps of:

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)

Abstract

A plastic pipe production line comprising; a kneader unit (1) in which plastic raw material and additives are melted to obtain a plastic mixture, and an extruder unit, positioned independent of the kneader unit (1), in which the plastic mixture obtained from said kneader unit (1) is melted by means of resistance elements after said mixture is solidified characterized in that; at least one pump element (2) coupled with said kneader unit (1) and at least one molding unit (3) connected to the pump element (2) are provided whereby defining one-phased plastic-based pipe production line by eliminating the extruder unit.

Description

APPARATUS AND METHOD FOR A ONE-STEP PLASTIC PIPE PRODUCTION
TECHNICAL FIELD
Present invention relates to a kneader unit where granulated plastic mixtures for plastic pipes are produced, whereas more attention is paid particularly to a 5 coupled production line in which only such a kneader unit, a mold unit where pipes are shaped, and a pump unit embodied between such units are included by removing the extruder unit where the granulated mixtures obtained by melting and solidifying plastic and additives (in said kneader unit) are melted again.
BACKGROUND OF THE INVENTION
,ιo The production of plastic based pipes comprises generally two phases. In the first phase, plastic raw material (polymer) is melted together with additives reinforcing pipes' physical properties in a kneader unit and thus a granulated mixture is produced. So, the kneader unit functions as a unit where plastic raw material and additives are brought together and a homogeneous plastic based mixture is
15 formed. Then the mixtures which are solidified and granulated in the kneader unit are melted in the second phase in an extruder and a desired pipe shape is obtained.
In other words, present systems where plastic based pipes are produced necessitate two phased and independent processes comprising a kneader unit 20 and an extruder line.
The working principle of such an extruder line is based on melting back a granulated mixture from a kneader unit and on giving a desired shape to such melted plastic mixtures. The melted material is formed by means of resistance elements located within the extruder unit and is exposed to high pressure and 25 temperature in the extruder in order to obtain any desired shape. To prevent the inner temperature of such an extruder from reaching to undesired levels in such a process, the temperature is controlled by cooling from the exterior of the metal parts of the extruder. On cooling said metal parts, however, the melted material in contact with such parts starts to cool earlier than the remaining melted plastic material so as to cause an uneven cooling and consequently, the mixture of polymer raw material and additives does not become homogeneous. As a result of this circumstance, significant losses happen in mechanical properties of the raw material of a pipe to be produced.
In addition to the aforementioned disadvantage, since the present plastic based pipe production process consists of two phases, i.e. melted and cooled in kneaders and then melted back in extruders, the mechanical characteristics of such plastic material gets poor. Also more than one process increases the cost of workmanship.
Another disadvantage of aforementioned systems is that such systems require a high-energy consumption. Likewise, granulated mixture melted and then solidified in the kneader is melted back in the extruder unit to become shaped.
DESCRIPTION OF THE INVENTION
The object of the present invention is to perform a one-phased plastic-based pipe production process.
Another object of the present invention is to preserve the mechanical properties of a plastic based pipe product.
Yet another objective of the present invention is to lower down the cost of the plastic-based pipe production process.
The kneader based plastic pipe production line under the present invention comprises three main units. The first unit is the kneader unit where polymer as a raw material of plastic is mixed with additives. The second unit is a pump unit (preferably a gear pump) which provides high pressure in order to transmit the melted plastic mixture formed in the kneader unit to the molding unit. The third unit is the molding unit where the plastic pipe is given any desired shape. So, the present invention is a production line in which a kneader unit, a pump, and a molding unit is included and in which the extruder unit towards known extruder- based plastic pipe processes is eliminated. Said pump embodied as the second unit provides high pressure so that the melted plastic mixture within the kneader unit is transmitted to the molding unit to be given any desired shape therein.
In this way, any plastic mixture homogenized by melting in the kneader unit is -by means of a pump (preferably a gear pump) coupled to said kneader unit- sent to the rolling unit where any desired pipe shape is obtained and whereto said gear pump is connected. As a consequence, such plastic-based pipe is embodied in only one process at only one production line.
DESCRIPTION OF FIGURES
The present invention is to be evaluated together with the annexed figures explained below in order to understand best this invention's embodiment along with its advantages.
Figure 1 gives a perspective view of the kneader-based pipe production line embodied under the present invention.
Reference Numbers of Parts
1 Kneader unit
2 Pump unit
3 Molding unit
4 Plastic raw material funnel
5 Mixture material funnel
6 Mixture material funnel
7 Pipe outlet section
8 Pipe outlet end DETAILED DESCRIPTION OF THE INVENTION
Figure 1 shows the kneader-based plastic pipe production line under the present invention. Polymer material that is entering to the kneader unit (1) via the plastic raw material funnel (4) is melted together with additives entering from the mixture material funnels (5, 6) by means of friction caused by the screw present in the kneader unit (1 ) and a plastic-based mixture is formed with a homogeneous structure.
The melted plastic mixture is transmitted to the pump unit (2) connected to the kneader unit (1) by means of a screw mechanism present in the kneader unit (1). This pump (2) is a gear pump under a preferred embodiment of the present invention. Since the pressure of the melted plastic based material within the kneader unit (1 ) is lower than the pressure required to create a pipe form, such a gear pump (2) is utilized. Since this gear pump (2) conveys the melted material to the molding unit (3) at a constant flow rate, the waving flow is stabilized and the desired mechanical properties of such product is preserved. The melted plastic based material passing with a certain pressure from the outlet (8) of the gear pump (2) is sent to the molding unit (3) where a pipe form is given and any desired shape is given in this unit. The pipe leaving the molding unit (3) is cooled by passing through a basin and is sent to the cutting element by means of a drawing element to be brought to its final shape.
The kneader unit in the pipe production line according to the present invention can alternatively realize pipe production by one line and can optionally perform granulated mixture production on another line.
According to another alternative embodiment under the present invention, a number of rolling unit (3) can be fed with melted plastic material by a distribution element such as a manifold positioned on the end of the gear pump's (2) outlet (8) and thus, multiple pipe production can be realized with multiple rolling units (3) in one phase. The coupled plastic pipe production line under the present invention presents also an approach where pipe production is realized with only one phase, comprising the following steps of:
melting and mixing the plastic based raw material and the additives within the kneader unit (1 );
sending the melted plastic based mixture to the pump element (2) coupled with the kneader unit (1 ) by means of a screw;
increasing pressure of the melted plastic based material in the pump element (2) and sending thereof to the molding unit (3) embodied on the outlet of the pump element (2);
forming a pipe within the molding unit;
cooling down the pipe in a pool unit;
conveying the pipe by means of a drawing element; and
final shape forming the pipe by means of a cutting element.

Claims

1. A plastic pipe production line comprising; a kneader unit (1) in which plastic raw material and additives are melted to obtain a plastic mixture, and an extruder unit, positioned independent of the kneader unit (1 ), in which the plastic mixture obtained from said kneader unit (1) is melted by means of resistance elements after said mixture is solidified characterized in that;
at least one pump element (2) coupled with said kneader unit (1) and at least one molding unit (3) connected to the pump element (2) are provided whereby defining one-phased plastic-based pipe production line by eliminating the extruder unit.
2. One-phased plastic-based pipe production line according to claim 1 , characterized in that said plastic mixture is melted only within said kneader unit (1) along the pipe production process.
3. One-phased plastic-based pipe production line according to anyone of the claims, characterized in that said pump (2) is preferably a gear pump.
4. One-phased plastic-based pipe production line according to anyone of the preceding claims, characterized in that a manifold is arranged at outlet (8) of said pump (2) for feeding multiple molding/rolling units (3) simultaneously as desired.
5. One-phased plastic-based pipe production line according to the anyone of the preceding claims, characterized further in that a granule mixture production line connected to said kneader unit (1 ) and independent of said molding unit (3) and said pump element (2) is provided.
6. One-phased plastic-based pipe production method according to the anyone of the preceding claims, comprising the following steps of:
melting and mixing the plastic based raw material and the additives within the kneader unit (1 ); sending the melted plastic based mixture to the pump element (2) coupled with the kneader unit (1 ) by means of a screw;
increasing pressure of the melted plastic based material in the pump element (2) and sending thereof to the molding unit (3) embodied on the outlet of the pump element (2);
forming a pipe within the molding unit;
cooling down the pipe in a pool unit;
conveying the pipe by means of a drawing element; and
final shape forming the pipe by means of a cutting element.
PCT/IB2002/003975 2002-09-26 2002-09-26 Apparatus and method for a one-step plastic pipe production WO2004033186A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
AU2002341244A AU2002341244A1 (en) 2002-09-26 2002-09-26 Apparatus and method for a one-step plastic pipe production
PCT/IB2002/003975 WO2004033186A1 (en) 2002-09-26 2002-09-26 Apparatus and method for a one-step plastic pipe production

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/IB2002/003975 WO2004033186A1 (en) 2002-09-26 2002-09-26 Apparatus and method for a one-step plastic pipe production

Publications (1)

Publication Number Publication Date
WO2004033186A1 true WO2004033186A1 (en) 2004-04-22

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WO (1) WO2004033186A1 (en)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4461734A (en) * 1982-09-13 1984-07-24 Union Carbide Corporation Process for plasticization and pumping of low bulk density plastics
JPS59164124A (en) * 1983-03-08 1984-09-17 Kobe Steel Ltd Continuous kneading and extruding device with gear pump
US5310256A (en) * 1991-08-09 1994-05-10 Werner & Pfleiderer Gmbh Apparatus for mixing and processing plastic material including a delivery pump
US5433593A (en) * 1994-06-02 1995-07-18 Lci Corporation Gear pump mounting assembly for thermoplastic extrusion line

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4461734A (en) * 1982-09-13 1984-07-24 Union Carbide Corporation Process for plasticization and pumping of low bulk density plastics
JPS59164124A (en) * 1983-03-08 1984-09-17 Kobe Steel Ltd Continuous kneading and extruding device with gear pump
US5310256A (en) * 1991-08-09 1994-05-10 Werner & Pfleiderer Gmbh Apparatus for mixing and processing plastic material including a delivery pump
US5433593A (en) * 1994-06-02 1995-07-18 Lci Corporation Gear pump mounting assembly for thermoplastic extrusion line

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
DAVID SMITH: "solution for extrusion efficiency", KRAUSMAFFEI UK, 20 April 2001 (2001-04-20), XP002238853, Retrieved from the Internet <URL:www.kraussmaffei.co.uk/pr/010420.html+direct+compounding+extrusion&hl=de&ie=UTF-8> [retrieved on 20030417] *
PATENT ABSTRACTS OF JAPAN vol. 009, no. 014 (M - 352) 22 January 1985 (1985-01-22) *

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