EP0993356A1 - Procede pour refroidir et granuler des boudins de matiere thermoplastique - Google Patents

Procede pour refroidir et granuler des boudins de matiere thermoplastique

Info

Publication number
EP0993356A1
EP0993356A1 EP98936340A EP98936340A EP0993356A1 EP 0993356 A1 EP0993356 A1 EP 0993356A1 EP 98936340 A EP98936340 A EP 98936340A EP 98936340 A EP98936340 A EP 98936340A EP 0993356 A1 EP0993356 A1 EP 0993356A1
Authority
EP
European Patent Office
Prior art keywords
pair
strands
transport
rollers
route
Prior art date
Legal status (The legal status 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 status listed.)
Withdrawn
Application number
EP98936340A
Other languages
German (de)
English (en)
Inventor
Walter Pirrung
Gerald Weis
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Rieter Automatik GmbH
Original Assignee
Rieter Automatik 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 Rieter Automatik GmbH filed Critical Rieter Automatik GmbH
Publication of EP0993356A1 publication Critical patent/EP0993356A1/fr
Withdrawn legal-status Critical Current

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
    • 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
    • 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
    • B29C48/05—Filamentary, e.g. strands
    • 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
    • B29C35/00—Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
    • B29C35/16—Cooling
    • B29C2035/1616—Cooling using liquids
    • 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

Definitions

  • the invention relates to a device for cooling, drying and granulating melted extrudate strands made of thermoplastic materials with an inclined drainage channel arranged with its upper end under the nozzles, a device generating a coolant flow on the drainage channel and one arranged downstream of the drainage channel , with a feed roller pair of pelletizers and with a transport line arranged in front of the pelletizer, which has in the area of its entrance a pair of conveying rollers which detects the fed strands.
  • Such a device is known from DE-OS 44 39 774.
  • the pair of conveying rollers of this device is used to grasp strands guided over the drainage channel and to push them safely over the following transport path designed as a temperature control path, in order to ensure that the strands are self-threading.
  • the strands are pushed forward over the transport route until they are gripped by the pair of feed rollers of the granulator, which completes the threading of the supplied strands.
  • the strands are exposed to a dwell time that depends on the transport speed of the conveyor rollers, as a result of which temperature differences over the strand cross section are to be compensated. There are obviously no special drying effects.
  • the invention has for its object to design the device described above so that it results in a high degree of drying of the plastic strands. According to the invention, this is done in that both the conveyor roller pair and the feed roller pair are set apart from the transport path with their respective roller gap in such a way that the strands are conveyed away from the transport path by detecting the strands in the feed roller pair and due to a stronger pull by the feed roller pair compared to the feed roller pair .
  • a blowing path which is short compared to the transport path for blowing off liquid adhering to the strands can advantageously be arranged after the pair of conveyor rollers.
  • This blowing section can be arranged between the pair of conveyor rollers and the transport section as well as between the transport section and the granulator.
  • an intermediate section is expediently arranged between the drainage channel and the transport section, which can optionally be operated as a cooling or drying section. Depending on its design, this intermediate section can be used to bring about any necessary intensified cooling of the plastic strands, for example by arranging spray nozzles for a coolant on the intermediate section. If the degree of drying is more important, the intermediate section can also be operated in such a way that it allows a kind of predrying, for example by arranging air-blowing nozzles.
  • the transport of such plastic strands can be additionally secured by forming the transport route and, if necessary, the intermediate route as a conveyor belt.
  • the conveyor belt enables the plastic strands to be self-threaded with particularly high security.
  • Another way of intensifying the transport effect is to design the transport route and possibly the intermediate route as a vibration conveyor.
  • the transport route and, if appropriate, the intermediate route can be inclined relative to the drainage channel in such a way that the strands are led upwards. This ensures that the device can convey plastic strands in granulators that have a normal working height, for example Exemplary embodiments of the invention are shown in the figures. Show it
  • FIG. 1 the device with a transport route directly adjoining the drainage channel with the interposition of the conveyor roller pair with the transport route being aligned horizontally;
  • Figure 2 the device with a combination of transport route and intermediate route, both of which are inclined upwards.
  • the device shown in FIG. 1 contains the nozzle plate 1 with nozzles from which thermoplastic plastic strands 2 emerge.
  • the plastic strands reach the drainage channel 3 directed obliquely downwards, which is fed with cooling water at its upper left end via the water tank 4.
  • the water tank 4 is therefore the device mentioned above which generates a flow of coolant.
  • the plastic strands 2 are entrained and cooled by the cooling liquid flowing down the drainage channel 3 and finally emerge from the drainage channel 5 at the end 5, whereby they have already cooled at least to the extent that their surface has hardened.
  • the coolant flowing down the drainage channel reaches the area of a sieve (not shown here) in the bottom of the drainage channel 3, through which the coolant flows and is drained off via the drainage box 6.
  • the plastic strands 2, which arrive at the end 5 of the drainage channel 3, are thus largely free of coolant and only wetted with coolant on their surface.
  • the drainage channel 3 is arranged downstream of the transport path 7, which is oriented horizontally here.
  • the conveyor rollers 8 and 9 consisting of a pair of conveyor rollers is arranged, which with its existing roller nip between the two conveyor rollers 8 and 9 detects the incoming plastic strands 2 and clamps them slightly, due to the rotation of the conveyor rollers 8 and 9 these pull exert on the plastic strands 2 and thus push the plastic strands forward on the transport route 7.
  • the transport path 7 has a flat sheet metal base, over which the plastic strands are first pushed over until they are gripped by the pair of feed rollers 10 and 11 of the granulator 12.
  • the conveyor roller pair 8/9 and the feed roller pair 10/11 is arranged so that the respective roller gap is separated from the transport path 7, i.e. the nip between the conveyor rollers 8 and 9 and the feed rollers 10 and 11 is a few millimeters higher with respect to the level of the transport path 7.
  • the drive of the feed rollers 10 and 11 and that of the feed rollers 8 and 9 takes place in such a way that the feed roller pair 10/11 exerts a pull on the plastic strands, i.e. the plastic strands 2 are stretched between the pair of conveyor rollers 8 and 9 and the pair of feed rollers 10 and 11, as a result of which the plastic strands 2 are transported when they are conveyed in a position lifted off the bottom of the transport path 2.
  • the strands 2 are due to the pull exerted on them by the feed roller pair 10/11 and the above-mentioned offset position of the Roll nips of the roller pairs 8/9 and 10/11 are drawn largely freely suspended above the transport path 7 and can therefore be freely washed around by the surrounding air. Taking into account the relatively high temperature still inherent in the plastic strands 2 at this point, this results in residual water evaporating or evaporating on the surface of the plastics 2, so that at the end of the transport path 7 the plastic strands 2 are practically dry in the granulator 12 arrive. The granulator 12 is thus able to deliver practically dry granules.
  • a vibrator is indicated below the transport path 7 with dash-dotted lines, which is attached to the bottom of the transport path 7 and which, if necessary, ensures, in particular when threading plastic strands 2 onto this along the transport path 7, to exert a special conveying effect.
  • FIG. 2 shows a modification of the device according to FIG. 1, which consists in that the intermediate section 13 is inserted between the drainage channel 3 and the transport path 7, via which the plastic strands 2 from the end 5 of the drainage channel 3 to the conveyor roller pair 8/9 be transported.
  • the intermediate section 13 is kept free of any devices for influencing the plastic strands 2, which may consist, for example, in spray nozzles for spraying on a coolant or blowing devices, in order, if necessary, to further cool or pre-dry the plastic strands 2.
  • FIG. 2 Simple embodiment of the intermediate section 13 shown without the above-mentioned assemblies a supplementary cooling and drying of the plastic strands 2 passed over them.
  • a blowing device 14 is arranged in the device according to FIG 2 washed and any remaining water is blown away from the surface. This leads to a substantial pre-drying, so that in the area of the transport path 7, the plastic strands 2 guided over them remain only relatively little moisture.
  • blowing device 14 can of course also be an arrangement for blowing out air in the reverse direction, which is then of course to be arranged above the plastic strands 2. It is also possible to arrange such a blowing device alone or additionally between the end of the transport path 7 and the granulator 12.
  • the device according to FIG. 2 also has the peculiarity that the intermediate section 13 and the transport section 7 are arranged inclined upwards, so that plastic strands 2 guided over these two areas gain in height and thus without further ado a correspondingly high arranged pair of feed rollers 10/11 can be fed to the granulator 12 without deflection.
  • the right deflection roller of the conveyor belt 16 simultaneously forms the one conveyor roller 9, which cooperates with the other conveyor roller 8 in the sense of the function of the pair of conveyor rollers. The storage of these two rollers

Landscapes

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

Abstract

L'invention concerne un dispositif pour refroidir, sécher et granuler des boudins (2) de matière thermoplastique en fusion sortant de filières. Ce dispositif comporte à son extrémité supérieure une rigole d'écoulement (3) inclinée disposée sous les filières, des moyens pour produire un flux de liquide de refroidissement sur la rigole d'écoulement (3), un granulateur (12) pourvu d'une paire de rouleaux d'alimentation (10, 11) disposés en aval de la rigole d'écoulement et une section de transport (7) disposée en amont du granulateur. Cette section de transport (7) présente, au niveau de son entrée, une paire de rouleaux de transport (8, 9) saisissant les boudins acheminés. La paire de rouleaux de transport et la paire de rouleaux d'alimentation (10, 11) sont décalées, au niveau de leur emprise respective, par rapport à la section de transport (7) de telle manière que lorsque les boudins (2) sont saisis par la paire de rouleaux d'alimentation (10, 11) et tirés plus fortement par cette dernière que par la paire de rouleaux de transport (8, 9), ils sont soulevés de la section de transport (7) pendant leur transport.
EP98936340A 1997-07-04 1998-06-15 Procede pour refroidir et granuler des boudins de matiere thermoplastique Withdrawn EP0993356A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19728661A DE19728661A1 (de) 1997-07-04 1997-07-04 Vorrichtung zum Abkühlen und Granulieren von Strängen aus thermoplastischem Kunststoff
DE19728661 1997-07-04
PCT/EP1998/003587 WO1999001265A1 (fr) 1997-07-04 1998-06-15 Procede pour refroidir et granuler des boudins de matiere thermoplastique

Publications (1)

Publication Number Publication Date
EP0993356A1 true EP0993356A1 (fr) 2000-04-19

Family

ID=7834689

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98936340A Withdrawn EP0993356A1 (fr) 1997-07-04 1998-06-15 Procede pour refroidir et granuler des boudins de matiere thermoplastique

Country Status (3)

Country Link
EP (1) EP0993356A1 (fr)
DE (1) DE19728661A1 (fr)
WO (1) WO1999001265A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19931222C2 (de) * 1999-07-06 2002-08-01 Rieter Automatik Gmbh Vorrichtung zum Granulieren von Kunststoffsträngen
DE10129756C1 (de) * 2001-06-20 2002-09-12 Scheer & Cie C F Kunstoffstranggranulieranlage
DE102007022743A1 (de) * 2007-05-15 2008-11-20 C. F. Scheer & Cie Gmbh & Co Granulieren von Kunststoffsträngen
DE102007027418A1 (de) * 2007-06-14 2008-12-18 Rieter Automatik Gmbh Stranggranulator zum Granulieren von Kunststoffsträngen

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1176346B (de) * 1952-09-29 1964-08-20 Exxon Research Engineering Co Verfahren zum Granulieren von thermo-plastischem Material
DE3900250A1 (de) * 1989-01-05 1990-07-12 Hench Automatik App Masch Vorrichtung zum abkuehlen, trocknen und granulieren von straengen
DE4439774B4 (de) * 1994-11-07 2004-02-26 C. F. Scheer & Cie Gmbh & Co Vorrichtung zum Granulieren von Kunststoff-Strängen

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9901265A1 *

Also Published As

Publication number Publication date
DE19728661A1 (de) 1999-01-07
WO1999001265A1 (fr) 1999-01-14

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