EP0474825A1 - Schneckenextruder - Google Patents

Schneckenextruder

Info

Publication number
EP0474825A1
EP0474825A1 EP91906859A EP91906859A EP0474825A1 EP 0474825 A1 EP0474825 A1 EP 0474825A1 EP 91906859 A EP91906859 A EP 91906859A EP 91906859 A EP91906859 A EP 91906859A EP 0474825 A1 EP0474825 A1 EP 0474825A1
Authority
EP
European Patent Office
Prior art keywords
pins
cylinder
screw extruder
extruder according
screw
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
EP91906859A
Other languages
German (de)
English (en)
French (fr)
Inventor
Wilfried Baumgarten
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.)
Kleinewefers Kunststoffanlagen GmbH
Original Assignee
Kraftanlagen AG
Kleinewefers Kunststoffanlagen 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 Kraftanlagen AG, Kleinewefers Kunststoffanlagen GmbH filed Critical Kraftanlagen AG
Publication of EP0474825A1 publication Critical patent/EP0474825A1/de
Ceased legal-status Critical Current

Links

Classifications

    • 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
    • B29C48/78—Thermal treatment of the extrusion moulding material or of preformed parts or layers, e.g. by heating or cooling
    • B29C48/80—Thermal treatment of the extrusion moulding material or of preformed parts or layers, e.g. by heating or cooling at the plasticising zone, e.g. by heating cylinders
    • B29C48/83—Heating or cooling the cylinders
    • B29C48/834—Cooling
    • 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
    • B29B7/34—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices
    • B29B7/38—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices rotary
    • B29B7/40—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices rotary with single shaft
    • B29B7/42—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices rotary with single shaft with screw or helix
    • B29B7/422—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices rotary with single shaft with screw or helix with screw sections co-operating, e.g. intermeshing, with elements on the wall of the surrounding casing
    • 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
    • B29C48/29—Feeding the extrusion material to the extruder in liquid form
    • 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
    • B29C48/36—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
    • B29C48/397—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 using a single screw
    • 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
    • B29C48/50—Details of extruders
    • B29C48/68—Barrels or cylinders
    • B29C48/685—Barrels or cylinders characterised by their inner surfaces, e.g. having grooves, projections or threads
    • B29C48/687—Barrels or cylinders characterised by their inner surfaces, e.g. having grooves, projections or threads having projections with a short length in the barrel direction, e.g. pins
    • 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
    • B29C48/50—Details of extruders
    • B29C48/76—Venting, drying means; Degassing means
    • 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
    • B29C48/50—Details of extruders
    • B29C48/76—Venting, drying means; Degassing means
    • B29C48/765—Venting, drying means; Degassing means in the extruder apparatus
    • B29C48/766—Venting, drying means; Degassing means in the extruder apparatus in screw extruders
    • B29C48/767—Venting, drying means; Degassing means in the extruder apparatus in screw extruders through a degassing opening of a barrel
    • 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
    • B29C48/78—Thermal treatment of the extrusion moulding material or of preformed parts or layers, e.g. by heating or cooling
    • B29C48/80—Thermal treatment of the extrusion moulding material or of preformed parts or layers, e.g. by heating or cooling at the plasticising zone, e.g. by heating cylinders
    • B29C48/83—Heating or cooling the cylinders
    • 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
    • B29B7/74—Mixing; Kneading using other mixers or combinations of mixers, e.g. of dissimilar mixers ; Plant
    • B29B7/7476—Systems, i.e. flow charts or diagrams; Plants
    • B29B7/7495—Systems, i.e. flow charts or diagrams; Plants for mixing rubber
    • 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
    • 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

  • the invention relates to a screw extruder, in the at least one screw receiving cylinder of which holes are provided for receiving pins which project into the conveying region and are arranged in radial planes.
  • Such extruders have become known as pin barrel extruders in various embodiments, the pins projecting radially into the barrel and engaging in circumferential grooves of the screw thread.
  • the main area of application for such pin cylinder extruders is for single-screw extruders.
  • the pins have gained particular importance in the plasticization and mixing of the material to be extruded, which, for example according to DE-A-01 37 813 for dough kneading and meat cutting machines.
  • Stick extruders are also used for sausage production, e.g. according to US-A-18 48 236, was used. With other diverse materials, e.g. those that need to be dewatered, special pin extruders according to patent DE-PS 14 54 801 have become known.
  • Pen extruders have achieved great economic importance through the patent DE-PS 22 35 784 in the rubber processing industry, since it was possible with these machines to process even large throughputs by means of cold-fed extruders. (More than about 6000 kg / h).
  • the cold feed saves large preheating machines for the conventional heat feed extrusion and has already been used worldwide by the pin extruder in applications in the rubber processing industry, which has to cope with large throughputs during extrusion, namely, for example, the tire and conveyor belt industries .
  • Pins with a shorter penetration depth have also been used, or those whose depth adjustment can be changed, for example according to DE-A-35 03 911 or DE-A-35 06 424.
  • shorter effective lengths or adjustment depths are also one the result is less effectiveness in plasticizing, which is of course undesirable.
  • the depth adjustment is also associated with the possibility of error, in the critical case setting too low for the hardness of the mass to be plasticized and thus causing damage to the pen.
  • Pen breakage indicators have also become known, e.g. according to DE-A-32 21 472, which, however, do not eliminate the risk of breakages, but rather increase because of the weakening of the pen, and which at most reduce the consequential damage but can hardly prevent it. Better are with optimal design and pen material e.g. the pin bend displays according to DE-A-35 02 437, which enable the extruder to be switched off in good time before any significant damage has occurred. These fuses are suitable for each endangered pen
  • DE-A-38 05 849 provides bevelled pins which are intended to reduce the problem of compound adhesion and "dead corners", but this is only possible to an inadequate extent if the pins are not to be weakened too much.
  • E RS tion are only suitable for masses that are difficult to process.
  • Cylinder design cannot be implemented with an exchangeable wear sleeve and the available cooling surface is reduced in comparison to conventional extruders, which is why the throughput rate is reduced and the economy is impaired. This type of construction has therefore not been introduced.
  • the invention avoids the disadvantages of the prior art. It is the object of the invention to create a pin barrel extruder, the pins of which cannot bend or break, whose pins can be easily heated and whose pins can be varied in their effect and adapted to the various requirements.
  • the invention consists in that the axes of the pins are arranged tangentially or parallel to the tangents of the screws.
  • their plasticizing and mixing effects are achieved in a different way, namely by narrowing aisle parts, which makes the disintegration and plasticization of material much cheaper.
  • the pins can be mounted in a bore and for their ends to protrude freely into the cylinder.
  • the pins can stand like a thorn against the material flow, but can also stand in the direction of the material flow. In both cases it is achieved that the forces acting on the pin cannot act fully radially on the pin, but always only with a radial component. Should metal parts undesirably have entered the material flow, these metal parts do not attack at the end but in the central areas of the pin and thus exert a smaller moment on the pin than is the case with the conventional radially arranged pins.
  • pin projecting freely into the cylinder, in which the pin end tangentially in the groove which interrupts the thread of the screw while leaving a small gap
  • Groove base stands.
  • metal parts which have undesirably entered the material flow can bend the pin slightly so that its end lies against the base of the groove, but these metal parts cannot break the pin.
  • the pins in their area located in the cylinder are conical or elliptical in longitudinal section or non-circular in cross section.
  • REPLACEMENT LEAF Adjust the material accordingly to particularly favorable values.
  • pins are mounted at both ends in two holes in the cylinder. Pins arranged in this way can also be tempered particularly easily, since it is possible to use one end of the pin as an input for the temperature control means and the other end of the pin as an output for the temperature control means.
  • the pins are provided with at least one channel for receiving or flowing a temperature control agent.
  • a temperature control agent Especially in the area of the pencils, the plasticizing, digesting and mixing work performed on the pencils results in a special temperature increase.
  • the temperature rise in the material can be counteracted by tempering the pins.
  • the temperature control means can be cooling devices or flowing coolants. In special cases, in which a further increase in temperature is desired, the
  • REPLACEMENT LEAF Pins heaters are installed or you can pass heating means such as warm water or steam through the pins.
  • the pins can also be safely provided with bores for receiving sensors or sensors.
  • the tangentially lying pins in one, preferably the first plane, and to provide radially arranged pins in further planes.
  • the different mixing effects of the different pin arrangements can be used together in one and the same extruder. Special effects can result from the fact that parts of the peripheral surfaces of the pins are provided with preferably obliquely arranged recesses, in particular in the form of grooves. The disintegration of the material is thereby considerably accelerated because material which has already been disintegrated can more easily escape in the conveying direction through the grooves, while the grooves themselves have the effect of sharing on material which has not yet been disintegrated.
  • FIG. 1 shows a section through an extruder with two pins in a radial plane.
  • . 3 shows an extruder with four cylindrical pins which only partially protrude into the interior of the extruder
  • Figure 5 shows a part of a longitudinal section through an extruder.
  • FIG. 6 shows a section of an extruder similar to the extruder shown in FIG. 3 with four pins, but for the purpose of degassing via an external one
  • Vacuum or for gassing are pierced in the longitudinal direction.
  • FIG. 1 shows a section through a single-screw extruder cylinder 1, which has no cooling chamber in the section plane, since this is usually located between the pin planes.
  • the cylinder can be provided in a known manner with a resin ejection in order to reduce wear.
  • the bores for receiving the pins 2 are arranged here continuously and cut the inside wall of the cylinder.
  • the pins inserted into the bores have at one end a head which is provided with a thread which can be screwed into an internal thread of the bore. A hexagon on the head is used for this screwing.
  • the pin extends so far in this bore that it is fixedly supported at both ends in the bore. For this reason, the pin is longer than the longest length of the bore in the interior of the cylinder. Since the pin only protrudes into the interior of the cylinder with a small part of its circumferential surface, breaking off this pin is completely impossible.
  • the pen is arranged so that it is the bottom of the in the
  • REPLACEMENT Snail 5 located groove as little as that. touches screw recesses provided with a recess (the groove) at this point.
  • liquid temperature control can take place in the pin. Due to the fact that a gap with a reduced cross-section is formed between the pin peripheral surface and the screw core peripheral surface, the material is treated in a special way.
  • three non-continuous bores are provided for receiving cylindrical pins 6.
  • holes can be provided in the cylinder wall, which can be used to remove gas located under the extruder flow.
  • the radial plane in which the end faces of two pins 7 lie is provided with the reference symbol 8 and runs through the axis of the screw.
  • pins 9 are arranged in a radial plane, which are cylindrical over a substantial part of their pin length, but are conical at the end.
  • This cone 10 lies with its circumferential surface in the cone-shaped bore here, too, so that there are no dead corners.
  • Figure 5 shows part of a longitudinal section through the screw extruder with pins 2 in two radial planes.
  • REPLACEMENT LEAF Cooling channels 11 are provided in the cylinder wall between these radial planes.
EP91906859A 1990-04-02 1991-03-27 Schneckenextruder Ceased EP0474825A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4010540A DE4010540C1 (it) 1990-04-02 1990-04-02
DE4010540 1990-04-02

Publications (1)

Publication Number Publication Date
EP0474825A1 true EP0474825A1 (de) 1992-03-18

Family

ID=6403566

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91906859A Ceased EP0474825A1 (de) 1990-04-02 1991-03-27 Schneckenextruder

Country Status (4)

Country Link
US (1) US5324108A (it)
EP (1) EP0474825A1 (it)
DE (1) DE4010540C1 (it)
WO (1) WO1991015348A1 (it)

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EP1258335B1 (en) * 2001-05-15 2005-10-26 Italcoppie S.r.l. Extruder for temperature controlled extrusion
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US20050255224A1 (en) * 2003-08-20 2005-11-17 Kraft Foods Holdings, Inc. Integrated continuous meat processing system
US8172545B2 (en) * 2003-08-20 2012-05-08 Kraft Foods Global Brands Llc Method for controlling ground meat flow rates
US20050249862A1 (en) * 2003-08-20 2005-11-10 Kraft Foods Holdings, Inc. Method and apparatus for controlling texture of meat products
US20050276903A1 (en) * 2003-08-20 2005-12-15 Kraft Foods Holdings, Inc. Method and apparatus for meat product manufacturing
US7488502B2 (en) * 2003-08-20 2009-02-10 Kraft Foods Global Brands Llc Method of making processed meat products
US7169421B2 (en) * 2003-08-20 2007-01-30 Kraft Foods Holdings, Inc. Method of making processed meat products
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US8641263B2 (en) 2008-11-24 2014-02-04 Kraft Foods Group Brands Llc Method and apparatus for continuous processing of whole muscle meat products
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EP3473396B1 (de) * 2017-10-17 2021-06-16 Buss AG Asymmetrische zweiflüglige schneckenwelle für eine misch- und knetmaschine

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WO1991015348A1 (de) 1991-10-17
US5324108A (en) 1994-06-28

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