WO1998010910A1 - Extruder to produce plastic granules - Google Patents

Extruder to produce plastic granules Download PDF

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Publication number
WO1998010910A1
WO1998010910A1 PCT/EP1997/004916 EP9704916W WO9810910A1 WO 1998010910 A1 WO1998010910 A1 WO 1998010910A1 EP 9704916 W EP9704916 W EP 9704916W WO 9810910 A1 WO9810910 A1 WO 9810910A1
Authority
WO
WIPO (PCT)
Prior art keywords
extruder
mixing elements
static mixing
plastic granules
granulating
Prior art date
Application number
PCT/EP1997/004916
Other languages
German (de)
French (fr)
Inventor
Jürgen Bartl
Peter Heidemeyer
Original Assignee
Krupp Werner & Pfleiderer Gmbh
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 Krupp Werner & Pfleiderer Gmbh filed Critical Krupp Werner & Pfleiderer Gmbh
Priority to CA002265771A priority Critical patent/CA2265771A1/en
Priority to DE19780935T priority patent/DE19780935D2/en
Priority to JP10513239A priority patent/JP2001500439A/en
Priority to AU45543/97A priority patent/AU4554397A/en
Publication of WO1998010910A1 publication Critical patent/WO1998010910A1/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
    • B29B7/30—Mixing; Kneading continuous, with mechanical mixing or kneading devices
    • B29B7/32—Mixing; Kneading continuous, with mechanical mixing or kneading devices with non-movable mixing or kneading devices
    • 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
    • B29B9/02—Making granules by dividing preformed material
    • B29B9/06—Making granules by dividing preformed material in the form of filamentary material, e.g. combined with extrusion
    • B29B9/065—Making granules by dividing preformed material in the form of filamentary material, e.g. combined with extrusion under-water, e.g. underwater pelletizers
    • 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
    • B29C48/362—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using static mixing devices
    • 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

Definitions

  • the invention relates to an extruder for the production of plastic granules, in particular a screw extruder with a granulating device, consisting of a granulating head housing and a perforated plate.
  • a screw extruder with a granulating device consisting of a granulating head housing and a perforated plate.
  • Such an extruder is particularly suitable for cutting thermoplastic materials under water.
  • Static mixing elements of the aforementioned type are known. It is also known to use such static mixing elements in continuous processes, for example for the homogenization of plastic melts, in particular for mixing in additives and / or to compensate for differences in color and temperature.
  • the energy required for mixing is supplied exclusively by the pumps or extruders required to convey the components to be mixed.
  • the static mixing elements used in an extruder in front of the granulating device produce a mixing effect during the granulation by continuously splitting, expanding and rearranging the components. Homogenization without moving parts is thus brought about.
  • the invention aims at eliminating the disadvantages that occur in the known extruders with a granulating device.
  • the configuration of the extruder in accordance with the invention homogenizes the melt flow rate and ensures that the flow in the feed channels to the perforated plate approaches a block flow, the residence time spectrum of the melt in the discharge area being reduced at the same time. No additional housing to be heated is required, so that a longer overall length of the extruder is not necessary. In addition, only the one required due to the static mixing elements is built Pressure on. This creates optimal conditions for the granulation of thermoplastic materials, with hot-cut granulation with special consideration of the uniformity of the granulate. The uniformity of the granules is therefore significantly improved.
  • Another significant advantage of the extruder according to the invention is that there is no additional melt volume in the discharge area - as is the case with the known extruders because of the additional housing to be heated - but quite the contrary, the melt volume in the discharge area is still there due to the static mixing elements present is reduced.
  • the static mixing elements are arranged only a short distance in front of the perforated plate. As a result, the effect of the static mixing elements is used to the maximum and it is avoided that flow irregularities occur again behind the static mixing elements.
  • Fig. 2 shows a partial section of an extruder according to the invention.
  • a heatable housing 4 is provided between the extruder 1 and the pelletizing head housing 2, in which static mixing elements 5 are inserted.
  • the extruder 1 shown in FIG. 2 is also provided with a granulating head housing 2 and a perforated plate 3. However, no additional heatable housing is required here, because the static mixing elements 5 are inserted into the melt channels 6 of the pelletizing head housing 2.
  • the direction of flow of the melt is indicated by arrows.

Landscapes

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

Abstract

An extruder (1), especially a screw-type extruder, to produce plastic granules, comprises a granulating device with a granulating head case (2) and a perforated plate (3). Static mixed elements (5) known in the art are inserted in the melting canals (6) of the granulating head case (2).

Description

Extruder für die Herstellung von Kunststoffgranulat Extruder for the production of plastic granules
Die Erfindung betrifft einen Extruder für die Herstellung von Kunststoffgranulat, insbesondere einen Schneckenextruder mit einer Granuliervorrichtung, bestehend aus einem Granulierkopfgehäuse und einer Lochplatte. Ein derartiger Extruder eignet sich ins- besondere zum Schneiden thermoplastischer Kunststoffe unter Wasser.The invention relates to an extruder for the production of plastic granules, in particular a screw extruder with a granulating device, consisting of a granulating head housing and a perforated plate. Such an extruder is particularly suitable for cutting thermoplastic materials under water.
Statische Mischelemente der vorgenannten Art sind bekannt. Ebenfalls bekannt ist die Verwendung derartiger statischer Mischelemente bei kontinuierlichen Prozessen, beispielsweise zur Homogenisierung von Kunststoffschmelzen, insbesondere zur Einmischung von Additiven und/oder zum Ausgleich von Färb- und Temperaturunterschieden. Die für das Mischen erforderliche Energie wird hierbei ausschließlich von den für die Förderung der zu mischenden Komponenten benötigten Pumpen oder Extrudern geliefert.Static mixing elements of the aforementioned type are known. It is also known to use such static mixing elements in continuous processes, for example for the homogenization of plastic melts, in particular for mixing in additives and / or to compensate for differences in color and temperature. The energy required for mixing is supplied exclusively by the pumps or extruders required to convey the components to be mixed.
Die in einen Extruder vor der Granuliervorrichtung ein- gesetzten statischen Mischelemente bewirken bei der Granulierung einen Mischeffekt durch fortlaufendes Aufspalten, Ausdehnen und Umlagern der Komponenten. Es wird somit eine Homogenisierung ohne bewegte Teile herbeigeführt .The static mixing elements used in an extruder in front of the granulating device produce a mixing effect during the granulation by continuously splitting, expanding and rearranging the components. Homogenization without moving parts is thus brought about.
Bei bekannten Extrudern mit einer Granuliervorrichtung sind die statischen Mischelemente innerhalb eines beheizbaren Gehäuses angeordnet, das zwischen dem Extruder und dem Granulierkopfgehäuse vorgesehen ist. Hier- durch werden Schmelzeinhomogenitäten, die im Extruder entstehen, ausgeglichen. Strömungsungleichmäßigkeiten, die durch die Wandhaftung der Kunststoffe insbesondere im Austragsbereich - und dort im Granulierkopfgehäuse - entstehen, werden davon jedoch nicht beeinflußt. Es ergeben sich dadurch erhebliche Nachteile, denn ein derartiger mit einer Granuliervorrichtung versehener Extruder erfordertIn known extruders with a granulating device, the static mixing elements are arranged within a heatable housing which is provided between the extruder and the granulating head housing. This results in melt inhomogeneities in the extruder arise, balanced. Flow irregularities caused by the adhesion of the plastics to the wall, particularly in the discharge area - and there in the pelletizing head housing - are not affected by this. This results in considerable disadvantages, since such an extruder provided with a granulating device requires
- ein zusätzliches zu beheizendes Gehäuse- an additional housing to be heated
- dadurch bedingt eine größere Baulänge - und einen zusätzlichen Druckaufbau.- this means a larger overall length - and an additional pressure build-up.
Ferner werden im Bereich zwischen dem mit den statischen Mischelementen versehenen beheizbaren Gehäuse und der Lochplatte wieder Strömungsungleichmäßigkeiten erzeugt, oder es wird, falls dies vermieden werden soll, ein aufwendiger Wendelverteiler benötigt.Furthermore, flow irregularities are again generated in the area between the heatable housing provided with the static mixing elements and the perforated plate, or, if this is to be avoided, a complex spiral distributor is required.
Die Erfindung bezweckt die Beseitigung der bei den bekannten Extrudern mit einer Granuliervorrichtung auf- tretenden Nachteile.The invention aims at eliminating the disadvantages that occur in the known extruders with a granulating device.
Die Lösung der gestellten Aufgabe besteht bei einem Extruder der eingangs genannten Art darin, daß an sich bekannte statische Mischelemente in die Schmelzekanäle des Granulierkopfgehäuses eingesetzt sind.The solution to the problem in an extruder of the type mentioned is that known static mixing elements are used in the melt channels of the pelletizing head housing.
Durch die erfindungsgemäße Ausgestaltung des Extruders wird die Schmelzeflußgeschwindigkeit homogenisiert und erreicht, daß sich die Strömung in den Zuführkanälen zur Lochplatte an eine Blockströmung annähert, wobei gleichzeitig das Verweilzeitspektrum der Schmelze im Austragsbereich reduziert wird. Es wird kein zusätzliches zu beheizendes Gehäuse benötigt, so daß auch keine größere Baulänge des Extruders notwendig ist. Außerdem baut sich nur der wegen der statischen Mischelemente erforderliche Druck auf . Es werden somit optimale Bedingungen für das Granulieren thermoplastischer Kunststoffe geschaffen, mit einer Heißabschlaggranulierung unter besonderer Berücksichtigung der Gleichmäßigkeit des Granulats. Es wird also die Gleichmäßigkeit des Granulats wesentlich verbessert.The configuration of the extruder in accordance with the invention homogenizes the melt flow rate and ensures that the flow in the feed channels to the perforated plate approaches a block flow, the residence time spectrum of the melt in the discharge area being reduced at the same time. No additional housing to be heated is required, so that a longer overall length of the extruder is not necessary. In addition, only the one required due to the static mixing elements is built Pressure on. This creates optimal conditions for the granulation of thermoplastic materials, with hot-cut granulation with special consideration of the uniformity of the granulate. The uniformity of the granules is therefore significantly improved.
Ein weiterer wesentlicher Vorteil des erfindungsgemäßen Extruders besteht darin, daß sich kein zusätzliches Schmelzevolumen im Austragsbereich befindet - wie es bei den bekannten Extrudern wegen des zusätzlichen zu beheizenden Gehäuses der Fall ist - sondern ganz im Gegenteil das Schmelzevolumen im Austragsbereich durch die dort vorhandenen statischen Mischelemente noch vermindert wird.Another significant advantage of the extruder according to the invention is that there is no additional melt volume in the discharge area - as is the case with the known extruders because of the additional housing to be heated - but quite the contrary, the melt volume in the discharge area is still there due to the static mixing elements present is reduced.
In Ausgestaltung der Erfindung sind die statischen Mischelemente mit nur geringem Abstand vor der Lochplatte angeordnet. Hierdurch wird die Wirkung der statischen Mischelemente maximal genutzt und es wird vermieden, daß hinter den statischen Mischelementen wieder Strömungsungleichmäßigkeiten auftreten.In an embodiment of the invention, the static mixing elements are arranged only a short distance in front of the perforated plate. As a result, the effect of the static mixing elements is used to the maximum and it is avoided that flow irregularities occur again behind the static mixing elements.
In der Zeichnung sind jeweils die oberen Hälften des rechten .Abschnitts einer bekannten und eines erfindungsgemäßen Extruders mit einer Granuliervorrichtung schematisch dargestellt, und zwar zeigt,In the drawing, the upper halves of the right section of a known and an extruder according to the invention with a granulating device are shown schematically, namely,
Fig. 1 einen Teilausschnitt eines bekannten Extruders,1 is a partial section of a known extruder,
Fig. 2 einen Teilausschnitt eines erfindungsgemäßen Extruders .Fig. 2 shows a partial section of an extruder according to the invention.
Bei dem in Fig. 1 dargestellten Extruder 1, der mit einem Granulierkopfgehäuse 2 und mit einer Lochplatte 3 versehen ist, ist zwischen dem Extruder 1 und dem Granulierkopfgehäuse 2 ein beheizbares Gehäuse 4 vorgesehen, in das statische Mischelemente 5 eingesetzt sind.In the extruder 1 shown in FIG. 1, which has a pelletizing head housing 2 and a perforated plate 3 is provided, a heatable housing 4 is provided between the extruder 1 and the pelletizing head housing 2, in which static mixing elements 5 are inserted.
Der in Fig. 2 dargestellte Extruder 1 ist ebenfalls mit einem Granulierkopfgehäuse 2 und einer Lochplatte 3 versehen. Hierbei ist jedoch kein zusätzliches beheizbares Gehäuse erforderlich, weil die statischen Mischelemente 5 in die Schmelzekanäle 6 des Granulierkopfgehäuses 2 eingesetzt sind.The extruder 1 shown in FIG. 2 is also provided with a granulating head housing 2 and a perforated plate 3. However, no additional heatable housing is required here, because the static mixing elements 5 are inserted into the melt channels 6 of the pelletizing head housing 2.
Die Flußrichtung der Schmelze ist jeweils durch Pfeile angedeutet . The direction of flow of the melt is indicated by arrows.

Claims

Patentansprüche claims
1. Extruder (1) für die Herstellung von Kunststoff- granulat, insbesondere Schneckenextruder mit einer Granuliervorrichtung, bestehend aus einem Granulierkopfgehäuse (2) und einer Lochplatte (3), dadurch gekennzeichnet, daß an sich bekannte statische Mischelemente (5) in die Schmelzekanäle (6) des Granulierkopfgehäuses (2) eingesetzt sind.1. Extruder (1) for the production of plastic granules, in particular screw extruder with a granulating device, consisting of a granulating head housing (2) and a perforated plate (3), characterized in that known static mixing elements (5) into the melt channels ( 6) of the pelletizing head housing (2) are used.
2. Extruder nach Anspruch 1, dadurch gekennzeichnet, daß die statischen Mischelemente (5) mit nur geringem Abstand vor der Lochplatte ( 3 ) angeordnet sind. 2. Extruder according to claim 1, characterized in that the static mixing elements (5) are arranged only a short distance in front of the perforated plate (3).
PCT/EP1997/004916 1996-09-12 1997-09-09 Extruder to produce plastic granules WO1998010910A1 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
CA002265771A CA2265771A1 (en) 1996-09-12 1997-09-09 Extruder to produce plastic granules
DE19780935T DE19780935D2 (en) 1996-09-12 1997-09-09 Extruder for the production of plastic granules
JP10513239A JP2001500439A (en) 1996-09-12 1997-09-09 Extruder for producing plastic granules
AU45543/97A AU4554397A (en) 1996-09-12 1997-09-09 Extruder to produce plastic granules

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19637063.9 1996-09-12
DE19637063A DE19637063A1 (en) 1996-09-12 1996-09-12 Extruder for the production of plastic granules

Publications (1)

Publication Number Publication Date
WO1998010910A1 true WO1998010910A1 (en) 1998-03-19

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PCT/EP1997/004916 WO1998010910A1 (en) 1996-09-12 1997-09-09 Extruder to produce plastic granules

Country Status (5)

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JP (1) JP2001500439A (en)
AU (1) AU4554397A (en)
CA (1) CA2265771A1 (en)
DE (2) DE19637063A1 (en)
WO (1) WO1998010910A1 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006027216A1 (en) * 2006-06-12 2007-12-13 Pro-Tech Beratungs- Und Entwicklungs Gmbh Regranulation machine for plastic waste material has melt filter and gas extraction unit downstream of hot flaking and granulating sector
DE202012004600U1 (en) 2012-05-08 2012-06-01 Automatik Plastics Machinery Gmbh nozzle device
CA2843392C (en) * 2014-02-19 2020-08-25 Redetec Inc. Apparatus for extruding plastic materials

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1901013A1 (en) * 1969-01-10 1970-07-16 Reifenhaeuser Kg Injection head for thermoplastics extruders
GB1553459A (en) * 1976-05-15 1979-09-26 Demag Kunststofftech Extruder diehead
US4931237A (en) * 1989-01-23 1990-06-05 Amoco Corporation Extrusion die apparatus and process for producing tubular film from thermoplastic molten material
JPH0542578A (en) * 1991-08-12 1993-02-23 Noritake Co Ltd Extrusion molding die
EP0646408A1 (en) * 1993-10-05 1995-04-05 Sulzer Chemtech AG Device for homogenising very viscous liquids
EP0668139A1 (en) * 1994-02-21 1995-08-23 Sulzer Chemtech AG Process for preparing expandable plastic granules

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2971219A (en) * 1956-08-14 1961-02-14 Du Pont Mixer distribution plate
JPS5584528A (en) * 1978-12-21 1980-06-25 Showa Yuka Kk Mixer

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1901013A1 (en) * 1969-01-10 1970-07-16 Reifenhaeuser Kg Injection head for thermoplastics extruders
GB1553459A (en) * 1976-05-15 1979-09-26 Demag Kunststofftech Extruder diehead
US4931237A (en) * 1989-01-23 1990-06-05 Amoco Corporation Extrusion die apparatus and process for producing tubular film from thermoplastic molten material
JPH0542578A (en) * 1991-08-12 1993-02-23 Noritake Co Ltd Extrusion molding die
EP0646408A1 (en) * 1993-10-05 1995-04-05 Sulzer Chemtech AG Device for homogenising very viscous liquids
EP0668139A1 (en) * 1994-02-21 1995-08-23 Sulzer Chemtech AG Process for preparing expandable plastic granules

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 017, no. 336 (M - 1435) 25 June 1993 (1993-06-25) *

Also Published As

Publication number Publication date
DE19780935D2 (en) 1999-08-05
JP2001500439A (en) 2001-01-16
DE19637063A1 (en) 1998-03-19
AU4554397A (en) 1998-04-02
CA2265771A1 (en) 1998-03-19

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