WO1998010909A1 - Vorrichtung und verfahren zum granulieren von kunststoffen - Google Patents
Vorrichtung und verfahren zum granulieren von kunststoffen Download PDFInfo
- Publication number
- WO1998010909A1 WO1998010909A1 PCT/EP1997/004915 EP9704915W WO9810909A1 WO 1998010909 A1 WO1998010909 A1 WO 1998010909A1 EP 9704915 W EP9704915 W EP 9704915W WO 9810909 A1 WO9810909 A1 WO 9810909A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- granulating
- pelletizing
- knife
- flow
- liquid
- Prior art date
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
- 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
Definitions
- the invention relates to a device for granulating plastics, which has a knife blade which is arranged in a granulation hood through which liquid flows.
- the invention further relates to a method for granulating plastics, in which the granulation is carried out in a liquid by a granulating knife and in which the liquid flows around the granulating knife.
- DE-AS 23 28 019 describes a further pelletizing device for plastics, in which the pelletizing process takes place under the action of a flow of cooling liquid.
- the cooling liquid is supplied via a knife shaft and passed from the knife shaft to the knife wing.
- Both the DE-AS 26 46 309 and the DE-AS 23 28 019 promote the granulation water via a special feed pump.
- the object of the present invention is therefore to design a device of the type mentioned in the introduction in such a way that load-oriented cooling can be carried out in a simple manner.
- the knife blade is designed as a conveyor unit for the liquid flow.
- Another object of the present invention is to improve a method of the type mentioned in the introduction in such a way that the flow safety is improved and the energy consumption is reduced.
- This object is achieved in that the flow of the liquid is generated at least predominantly by the knife blade at the latest after completion of a start-up phase.
- the blade as a conveying device for the liquid flow, there is a direct coupling between the respective working conditions of the pelletizing knife and the liquid flow. This allows an optimal flow around the pelletizing knives in every work situation. Due to the large cross sections provided for the water supply, a relatively large amount of water can be supplied with relatively little energy expenditure. The resulting granules are immediately transported away from the granulating knife by the water flow. It is therefore not possible to pinch the granules between the granulating knife and a perforated plate arranged in front of the granulating knife. Likewise, no granules can collect centrally between the perforated plate and the knife blades. When granulating plastics that tend to agglomerate, the amount of granulating water required according to the prior art can be reduced.
- the pelletizing hood be connected to an additional pelletizing water circulation pump as start-up support.
- a pelletizing water channel extends through a pelletizing head housing in the direction of the pelletizing hood and is arranged with a flow direction essentially in the direction of a center line of the knife shaft bearing is.
- a uniform supply of plasticized plastic can be achieved in that an annular gap is arranged in the region of the pelletizing head housing as a melt channel for plasticized thermoplastic plastics, which essentially concentrically surrounds the pelletizing water channel.
- An expedient spatial orientation is that the pelletizing head housing is coupled to a melt feed in such a way that a melt bypass into the melt channel by approximately 90 ° is provided following an inflow opening of the pelletizing head housing.
- a particularly high efficiency in the generation of flow can be achieved in that the knife blade has pelletizing knives inclined relative to a radial direction.
- the plastic melt is transferred to the area of the knife blades in that a perforated plate is arranged in the area of a transfer of the granulating head housing into the granulating hood.
- An expedient embodiment consists in that the perforated plate is essentially ring-shaped and has a centrally arranged through-flow recess for the granulating water.
- a particularly high level of energy efficiency can be achieved in that, after an operating state has been reached, the flow of granulating liquid is generated exclusively by the granulating knife.
- An advantageous granulation process is provided in that the granulation process is carried out in a water flow.
- Fig. 1 is a partially sectioned plan view of a pelletizer
- Fig. 2 is a front view of a knife wing.
- a substantially horizontally oriented melt feeder opens into a pelletizing head housing 2 in a right-angled direction from the side.
- the melt feed 1 serves for connection to an extruder, a gear pump or a filter. This results in a melt inlet direction 3.
- a knife blade 7 is guided in the granulating hood 6 so that it can rotate.
- a perforated plate 8 is arranged in the direction of the pelletizing head housing 2 in front of the knife wing 7.
- a melt channel 10 which guides the plastic melt coming from the area of the melt feed 1 into the area of the granulation head housing 2 in the direction of the perforated plate 8.
- the plastic melt is comminuted by the blade wing 7.
- the granulating water which flows around the knife blade 7, cools and conveys the granules.
- a knife shaft bearing 11 and a drive 12 are arranged in the region of a frame 13 following the granulating hood 6.
- the drive 12 is coupled to the blade wing 7 via a shaft 14.
- the melt channel 10 is designed as an annular gap which essentially concentrically surrounds a cooling water channel 15.
- a transfer area 16 for diverting the plastic melt from the melt inlet direction 3 into the flow direction 5 extends from an inflow opening facing the melt feed 1 into a direction facing away from the inflow opening 17.
- the transfer area 16 is contemplated to provide the transfer area 16 with a sufficiently large cross-sectional area 18.
- FIG. 1 shows a preferred embodiment, but in principle other orientations in space are also possible. However, in the case of other orientations in space, an angle spanned by the melt inlet direction 3 and the flow direction is preferably approximately 90 °. 2 shows a frontal view of the blade wing 7.
- the blade wing 7 consists of the blade disc 21 and the pelletizing blade 19.
- the cutter disc 21 has a clamping surface 20 and a connection to the shaft 14.
- the pelletizing knives 19 are held on the clamping surface 20.
- the knives 19 are inclined with respect to a radial direction. With respect to a direction of rotation 22, the knives 19 are inclined in such a way that, with respect to a radial orientation, the ends of the knives 19 held on the clamping surface are oriented further in the direction of rotation 22 than the ends facing away from the clamping surface 20. This can improve the cutting effect.
- the inclined position of the knives 19 provides a turbine-like design of the knife blade 7, which in combination with the cooling water duct 15 has a turbine-like effect in accordance with a centrifugal pump.
- pelletizing water circulation pump When starting up the device, it is particularly thought to use an additional pelletizing water circulation pump during the start-up phase, in order to ensure a sufficient flow rate of the pelletizing liquid even with a low number of rotations of the blade wing 7. After reaching an operating state, the pelletizing water circulation pump is switched off, and the pelletizing water is conveyed exclusively by the suction action of the blade wing 7. The pelletizing water can thereby be conveyed without additional energy expenditure for the operation of the pelletizing water circulation pump. The flow also removes the solidifying thermoplastic granulated plastic particles.
- a further advantage is that the pressure differences occurring on the knife blade 7 are relatively small due to the flow guidance provided, and axial forces acting in the region of the pelletizing knife 9 are thereby reduced. This can support an extended lifespan.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19780934T DE19780934D2 (de) | 1996-09-13 | 1997-09-09 | Vorrichtung und Verfahren zum Granulieren von Kunststoffen |
AU43020/97A AU4302097A (en) | 1996-09-13 | 1997-09-09 | Device and process to granulate plastics |
CA002265633A CA2265633A1 (en) | 1996-09-13 | 1997-09-09 | Device and process to granulate plastics |
JP10513238A JP2001500438A (ja) | 1996-09-13 | 1997-09-09 | プラスチックの造粒のための装置と方法 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19637378A DE19637378A1 (de) | 1996-09-13 | 1996-09-13 | Vorrichtung und Verfahren zum Granulieren von Kunststoffen |
DE19637378.6 | 1996-09-13 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1998010909A1 true WO1998010909A1 (de) | 1998-03-19 |
Family
ID=7805570
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP1997/004915 WO1998010909A1 (de) | 1996-09-13 | 1997-09-09 | Vorrichtung und verfahren zum granulieren von kunststoffen |
Country Status (5)
Country | Link |
---|---|
JP (1) | JP2001500438A (de) |
AU (1) | AU4302097A (de) |
CA (1) | CA2265633A1 (de) |
DE (2) | DE19637378A1 (de) |
WO (1) | WO1998010909A1 (de) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10137525A1 (de) * | 2001-08-01 | 2003-02-13 | Rieter Automatik Gmbh | Vorrichtung zum Granulieren von aus Düsen austretenden thermoplastischem Kunststoff |
DE102009032993A1 (de) * | 2009-07-14 | 2011-01-20 | Automatik Plastics Machinery Gmbh | Vorrichtung und Verfahren zum Granulieren von Kunststoffmaterial |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1049232A (en) * | 1963-02-27 | 1966-11-23 | Black Clawson Co | A pelletizer for plastics material |
LU55521A1 (de) * | 1967-03-06 | 1968-05-03 | ||
DE2328019A1 (de) * | 1973-06-01 | 1974-12-12 | Werner & Pfleiderer | Verfahren und vorrichtung zum granulieren von kunststoffen |
JPS50130058A (de) * | 1974-04-01 | 1975-10-14 | ||
DE2455757A1 (de) * | 1974-11-26 | 1976-06-10 | Basf Ag | Verfahren und vorrichtung zum granulieren thermoplastischer massen |
JPS5222779B2 (de) * | 1974-04-16 | 1977-06-20 | ||
DE2646309A1 (de) * | 1976-10-14 | 1978-04-20 | Werner & Pfleiderer | Unterwasser-granuliervorrichtung |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CH411317A (de) * | 1964-02-01 | 1966-04-15 | Buss Ag | Granuliereinrichtung |
CH460319A (de) * | 1967-02-03 | 1968-07-31 | Barmag Barmer Maschf | Vorrichtung zum Granulieren von thermoplastischem polymerem Material |
US4300877A (en) * | 1979-01-10 | 1981-11-17 | Sterling Extruder Corp. | Underwater pelletizer |
-
1996
- 1996-09-13 DE DE19637378A patent/DE19637378A1/de not_active Withdrawn
-
1997
- 1997-09-09 JP JP10513238A patent/JP2001500438A/ja not_active Ceased
- 1997-09-09 WO PCT/EP1997/004915 patent/WO1998010909A1/de active Application Filing
- 1997-09-09 CA CA002265633A patent/CA2265633A1/en not_active Abandoned
- 1997-09-09 AU AU43020/97A patent/AU4302097A/en not_active Abandoned
- 1997-09-09 DE DE19780934T patent/DE19780934D2/de not_active Expired - Fee Related
Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1049232A (en) * | 1963-02-27 | 1966-11-23 | Black Clawson Co | A pelletizer for plastics material |
LU55521A1 (de) * | 1967-03-06 | 1968-05-03 | ||
GB1182388A (en) * | 1967-03-06 | 1970-02-25 | Barmag Barmer Maschf | Apparatus for Granulating Thermoplastic Material |
DE2328019A1 (de) * | 1973-06-01 | 1974-12-12 | Werner & Pfleiderer | Verfahren und vorrichtung zum granulieren von kunststoffen |
JPS50130058A (de) * | 1974-04-01 | 1975-10-14 | ||
JPS5222779B2 (de) * | 1974-04-16 | 1977-06-20 | ||
DE2455757A1 (de) * | 1974-11-26 | 1976-06-10 | Basf Ag | Verfahren und vorrichtung zum granulieren thermoplastischer massen |
DE2646309A1 (de) * | 1976-10-14 | 1978-04-20 | Werner & Pfleiderer | Unterwasser-granuliervorrichtung |
Non-Patent Citations (1)
Title |
---|
DATABASE WPI Section Ch Week 7728, Derwent World Patents Index; Class J, AN 77-49713Y (28), XP002048038 * |
Also Published As
Publication number | Publication date |
---|---|
DE19637378A1 (de) | 1998-03-19 |
JP2001500438A (ja) | 2001-01-16 |
DE19780934D2 (de) | 1999-09-02 |
AU4302097A (en) | 1998-04-02 |
CA2265633A1 (en) | 1998-03-19 |
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