EP0329715A1 - Dispositif de granulation de materiaux fondus - Google Patents

Dispositif de granulation de materiaux fondus

Info

Publication number
EP0329715A1
EP0329715A1 EP88902409A EP88902409A EP0329715A1 EP 0329715 A1 EP0329715 A1 EP 0329715A1 EP 88902409 A EP88902409 A EP 88902409A EP 88902409 A EP88902409 A EP 88902409A EP 0329715 A1 EP0329715 A1 EP 0329715A1
Authority
EP
European Patent Office
Prior art keywords
melt channel
channel
valve
pressure medium
medium
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.)
Ceased
Application number
EP88902409A
Other languages
German (de)
English (en)
Inventor
Michael Reinhard
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP0329715A1 publication Critical patent/EP0329715A1/fr
Ceased 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
    • B29B9/10—Making granules by moulding the material, i.e. treating it in the molten state
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S425/00—Plastic article or earthenware shaping or treating: apparatus
    • Y10S425/23—Hay wafering or pelletizing means

Definitions

  • the invention relates to a device for granulating - melting and softening materials, in particular plastics, consisting of a melt channel in which the material to be granulated is conveyed and a feed z melt channel through which a pressurized pressure intermittently as individual quantities in the melt channel is introduced, which means that the material flow of the substance to be granulated by volume displacement into individual substance portions ie Granules, is divided, and a valve through the periodic opening and closing the intermittent introduction of the pressure medium in the melt channel is controlled.
  • DE-AS 15 48 912 a device for dividing flowing media into individual successive sections which are separated from one another by sections of another medium which is immiscible with the medium to be divided.
  • both media are first led in separate lines to a consolidation point at which the dividing medium is injected from one side into the line leading the medium to be divided.
  • the dividing medium is then pressed via a pulsating metering device into a feed line from which it is injected the medium to be divided at the union point.
  • the supply of the dividing medium by means of the feed line entails that in this feed line, especially at higher ones
  • turbulence can occur in the area of the union, which likewise impairs the exact division of the medium to be divided.
  • US Pat. No. 4,151,251 describes a method specifically for the production of plastic granules, in which the plastic granules are produced by intermittently supplying a cooling medium into a channel leading to a plastic melt.
  • Water should preferably be used as the cooling medium.
  • the cooling medium is supplied via porous sintered metal, on the surface of which the plastic melt is conducted. Because of the intermittent supply of the cooling medium, the plastic melt always comes into direct contact with the sintered metal during the breaks in the supply. The contact of the plastic melt with the sintered metal entails the risk that small amounts of plastic melt penetrate into the sintered metal, remain there for too long and thus crack, whereby on the one hand the plastic melt is repeatedly contaminated and impaired and the openings in question the sintered metal.
  • the use of the sintered metal requires the supply of highly purified water, since contamination in the water serving as the cooling medium continuously clogs the sintered metal.
  • the connection of the sintered metal into the supply line for the cooling medium is unfavorable because there is a high pressure drop across the sintered metal due to the sharp edges of the individual pressure surges in the intermittent feeding of the
  • Cooling medium are flattened.
  • the invention is based on the object of designing the supply of the pressure medium causing the subdivision in such a way that the individual quantities of the pressure medium introduced into the melt channel give the substance guided in the melt channel pressure surges with the individual quantities which each divide the substance exactly.
  • this is done in that the wall of the melt channel is divided transversely to the channel axis to form a joint, that the two resulting joint parts of the melt channel are movable relative to one another in the direction of the channel axis in such a way that the moved parts share a part surrounding the melt channel Form an annular gap, which is connected on its outer circumference to a recess carrying the pressure medium, and that the mutually facing surfaces of the abutment parts form the sealing surfaces of the valve.
  • This design of the periodically actuated valve ensures that the successive pressure surges are generated directly at the point at which the pressure medium is introduced into the melt channel. Any resonances can practically not arise behind the valve.
  • the pressure medium is supplied concentrically, symmetrically to the substance in the melt channel, which is therefore uniform receives the pressure surge from all sides and is divided evenly in this way.
  • the one butt part is expediently designed in some areas as a tube, the tube protruding with one end into the recess and the end face of this end forming the one sealing surface.
  • the end face of the tube which is flushed with the pressure medium when the valve is open, can be advantageously used as a sealing surface.
  • the sealing surfaces can be made blunt or correspondingly conical.
  • blunt training there is easy reworkability, e.g. to restore tightness.
  • a corresponding conical design particularly high sealing effects can be achieved.
  • the conical design enables a shortening of the outlet part of the melt channel following the valve.
  • the melt channel, the pressure medium and the granulating material are expediently kept at the same temperature. This also has the advantage that no undesired distortions can occur in the device.
  • a liquid or a gas can be used as the pressure medium; water or is preferably used as the pressure medium Air.
  • the pressure medium care must also be taken to ensure that it does not react with the substance in the melt channel or mix with it.
  • the print medium must be easy to separate from the granulated material.
  • the liquid In order to support the tearing apart of the material carried in the melt channel, the liquid is allowed to change to steam after entering the melt stream, which results in a spontaneous increase in volume of the pressure medium.
  • a liquid In order to achieve this change in steam, a liquid should be selected as the pressure medium, which evaporates practically suddenly at ambient pressure and the usual temperature of the substance carried in the melt channel.
  • the ambient pressure behind the valve results practically from the fact that there are normally no long outlet parts connected to the valve, rather it is readily possible to work with short outlet parts.
  • the outlet part of the melt channel is made so short and the individual quantities of the pressure medium are such a volume that there is only one in the outlet part Portion of fabric.
  • This design also has the advantage that there is practically ambient pressure behind the valve, so that here a sudden evaporation of a liquid serving as a pressure medium can take place, as a result of which the individual portions of substance are practically thrown out of the outlet part after the valve has been actuated.
  • the portions of material After the individual portions of material have emerged from the outlet part, the portions of material are cooled in the usual manner as granules.
  • Figure 1 the device in section in several
  • Figure 3 a device with a plurality of
  • a thick-walled tube (11) protrudes from the base plate (10), the bore of which is the channel (4) in which the substance (1) to be granulated flows. Both parts are stationary. In phase 1 of the pelletizing process, the end face of the thick-walled tube bears against the discharge plate (12) and prevents pressure medium (2) from entering the channel. The feed (6) is therefore closed.
  • the pressure medium (2) is located in recesses in the distributor plate (13) which is firmly connected to the discharge plate (12) '. It is under a very high pressure built up by the pressure generator (8) and has a high temperature due to the continuous-flow heater (7).
  • the entire process part of the granulator consisting of the base plate (10), one or more thick-walled tubes (11), the discharge plate (12), the distributor plate (13) and other parts, is heated.
  • the supply part also includes the memory (5) and the safety valve (14).
  • the supply part is connected to the moving part via a flexible connection (15).
  • phase 2 of the granulating process the discharge plate (12) and the distributor plate (13) are moved away from the base plate (10) and the thick-walled tube (11) by the distance ax. This opens the feeder (6) and the print medium (2), e.g. Water enters the channel (4) due to the pressure gradient.
  • the print medium (2) e.g. Water enters the channel (4) due to the pressure gradient.
  • phase 3 the feed (6) is closed again. During this process the channel (4) hits
  • Pressure medium (2) in this case water, because of the significantly lower pressure in the channel (4) in steam (9), thereby separating the granulate (3) from the melt flow (1) and conveying it to the path due to the large volume increase Free.
  • the discharge plate 12 represents the outlet part of the melt channel.
  • the joint is formed by the two butt parts I and II, butt part I being represented by the tube 11 and the base plate 10 and the butt part II by the distributor plate 13 and the discharge plate 12 .
  • the end face of the tube 11 on the discharge plate side together with the opposite surface of the discharge plate 12 form the valve.
  • Plastic to be granulated polypropylene with 30% talc
  • FIG. 2 shows a modification of the illustration in FIG. 1, phase 2.
  • the sealing surfaces formed by the end face of the tube 11 and the relevant surface of the discharge plate 12, butt against each other. In the arrangement according to FIG. 2, these sealing surfaces are correspondingly conical, which results in a particularly good seal.
  • the recess receiving the pressure medium 2 is conically elongated, resulting in a shortening of the outlet part (channel 4) compared to the embodiment according to FIG.
  • FIG. 3 shows the design of a device according to the invention for granulating with a plurality of melt channels 4 connected in parallel.
  • the collar 16 is clamped between the base plate 10 and the main plate 19. With this construction, the tubes 11 are easily replaced if damaged or worn.
  • the plastic melt 20 is divided into the individual material flows 1 in the main plate 19.
  • the vibrator 21 and the mechanism with which the movement to open and close the valves 22 are shown.
  • the vibrator 21 is arranged between the main plate 19 and the coupling plate 23, wherein it is thermally separated from them by insulating plates 24.
  • the Köppelplatte 23 is heated like the main plate 19, the base plate 10, the distributor plate 13 and the Austragplat ⁇ te 12. This prevents the guide bolts 25 from jamming in the slide guides 26, which are located in the base plate 10 and the main plate 19.
  • the guide pin 25 are fixed on one side with the Coupling plate 23 and on the other side firmly screwed to the distributor plate 13 and the discharge plate 12.
  • all the valves 22 are closed simultaneously when the actuating bolt 27 of the vibrator 21 is disengaged and opened when the vehicle is moved back.
  • the pressure medium 2 can be introduced into the melt channels 4 in precisely metered fashion.
  • the steam emerging from the gap seals (29 in FIG. 2) is collected with the metal bellows 28 and can be discharged in a controlled manner.

Landscapes

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

Abstract

Un dispositif de granulation de matériaux fondus et ramollis, en particulier des matières plastiques, comprend un canal de masse fondue dans lequel le matériau à granuler est transporté, un orifice d'alimentation du canal de masse fondue par lequel un milieu pressurisé est introduit par intermittence en doses séparées dans le canal de masse fondue, le courant de matériau à granuler se subdivisant sous l'effet du refoulement du volume en portions séparées, c'est-à-dire en granulés, et une soupape qui commande par son ouverture et fermeture périodiques l'introduction intermittente du milieu sous pression dans le canal de masse fondue. La paroi du canal de masse fondue (4) est transversalement divisée par rapport à l'axe du canal, formant un point d'impact. Les deux parties d'impact (I, II) du canal de masse fondue (4) ainsi obtenues sont mobiles l'une par rapport à l'autre dans le sens de l'axe du canal, de façon à former, lorsqu'elles sont écartées l'une de l'autre, une fente annulaire (alimentation 6) qui entoure le canal de masse fondue (4) et qui est reliée à sa circonférence extérieure à un évidement de guidage du milieu sous pression (2). Les surfaces contiguës des parties d'impact (I, II) forment les surfaces d'étanchéité de la soupape (22).
EP88902409A 1987-03-18 1988-03-18 Dispositif de granulation de materiaux fondus Ceased EP0329715A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3708695 1987-03-18
DE19873708695 DE3708695A1 (de) 1987-03-18 1987-03-18 Granulator zum granulieren schmelzender und erweichender stoffe

Publications (1)

Publication Number Publication Date
EP0329715A1 true EP0329715A1 (fr) 1989-08-30

Family

ID=6323302

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88902409A Ceased EP0329715A1 (fr) 1987-03-18 1988-03-18 Dispositif de granulation de materiaux fondus

Country Status (5)

Country Link
US (1) US4960547A (fr)
EP (1) EP0329715A1 (fr)
JP (1) JPH01502731A (fr)
DE (1) DE3708695A1 (fr)
WO (1) WO1988006961A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101467104B (zh) * 2006-06-14 2013-07-24 伊斯曼柯达公司 带有罩面层的光致聚合物印刷版的冲洗方法

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4000571C1 (fr) * 1990-01-10 1991-06-06 Herbert 7853 Steinen De Huettlin
US5116550A (en) * 1990-03-27 1992-05-26 Perkins Newton B Method of making biodegradable free fill foam packing material
JP3347366B2 (ja) * 1992-06-23 2002-11-20 塩野義製薬株式会社 転動造粒装置及び方法
US8114006B2 (en) * 1998-10-06 2012-02-14 University Of South Florida Radio guided seed localization of imaged lesions
US8070466B2 (en) * 2006-10-11 2011-12-06 Freund Corporation Seamless capsule manufacturing apparatus
US9205590B2 (en) * 2012-03-06 2015-12-08 Wisconsin Alumni Research Foundation Polymer pelletization via melt fracture
US11559855B2 (en) 2017-03-14 2023-01-24 Wisconsin Alumni Research Foundation Surface topography control

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR700406A (fr) * 1930-08-11 1931-02-28 Chromographes Lebaron Freres S Dispositif de commande à distance pour pulvérisateurs ou appareils analogues
GB609692A (en) * 1946-03-20 1948-10-05 Distillers Co Yeast Ltd Improvements in or relating to the production of polystyrene
US3002615A (en) * 1957-10-22 1961-10-03 Jerome H Lemelson Extrusion apparatus
DE1132896B (de) * 1961-01-05 1962-07-12 Bayer Ag Verfahren zur Herstellung von koernigen oder zylinderfoermigen Granulaten
DE1548912B1 (de) * 1965-03-26 1971-11-25 Ceskoslovenska Akademie Ved Vorrichtung zum aufteilen stroemender medien auf einzelne aufeinanderfolgende abschnitte
DE1629719A1 (de) * 1967-10-19 1971-01-28 Baker Perkins Inc Misch- und Strangpresse mit Strangtrennvorrichtung
US3674404A (en) * 1970-08-06 1972-07-04 Sherwood Medical Ind Inc Extruder apparatus and accumulator
US3708253A (en) * 1970-09-01 1973-01-02 J Lemelson Extrusion apparatus
US4151251A (en) * 1977-10-25 1979-04-24 Leesona Corporation Pelletizing process
US4582473A (en) * 1984-06-25 1986-04-15 Usm Corporation Polymer pelletizer

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO8806961A1 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101467104B (zh) * 2006-06-14 2013-07-24 伊斯曼柯达公司 带有罩面层的光致聚合物印刷版的冲洗方法

Also Published As

Publication number Publication date
JPH01502731A (ja) 1989-09-21
WO1988006961A1 (fr) 1988-09-22
DE3708695C2 (fr) 1990-10-25
US4960547A (en) 1990-10-02
DE3708695A1 (de) 1988-09-29

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