DE2533195C3 - Continuous twin screw extruder - Google Patents

Continuous twin screw extruder

Info

Publication number
DE2533195C3
DE2533195C3 DE2533195A DE2533195A DE2533195C3 DE 2533195 C3 DE2533195 C3 DE 2533195C3 DE 2533195 A DE2533195 A DE 2533195A DE 2533195 A DE2533195 A DE 2533195A DE 2533195 C3 DE2533195 C3 DE 2533195C3
Authority
DE
Germany
Prior art keywords
screws
zone
mixing
screw extruder
extruder
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.)
Expired
Application number
DE2533195A
Other languages
German (de)
Other versions
DE2533195B2 (en
DE2533195A1 (en
Inventor
Kaita Higashi
Hideki Mizuguchi
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.)
Dai Nippon Toryo KK
Japan Steel Works Ltd
Original Assignee
Dai Nippon Toryo KK
Japan Steel Works Ltd
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 Dai Nippon Toryo KK, Japan Steel Works Ltd filed Critical Dai Nippon Toryo KK
Priority to DE2533195A priority Critical patent/DE2533195C3/en
Publication of DE2533195A1 publication Critical patent/DE2533195A1/en
Publication of DE2533195B2 publication Critical patent/DE2533195B2/en
Application granted granted Critical
Publication of DE2533195C3 publication Critical patent/DE2533195C3/en
Expired 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
    • 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
    • B29B7/46—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices rotary with more than one shaft
    • B29B7/48—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices rotary with more than one shaft with intermeshing devices, e.g. screws
    • B29B7/482—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices rotary with more than one shaft with intermeshing devices, e.g. screws provided with screw parts in addition to other mixing parts, e.g. paddles, gears, discs
    • 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
    • B29B7/46—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices rotary with more than one shaft
    • B29B7/48—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices rotary with more than one shaft with intermeshing devices, e.g. screws
    • B29B7/484—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices rotary with more than one shaft with intermeshing devices, e.g. screws with two shafts provided with screws, e.g. one screw being shorter than the other
    • 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
    • B29B7/46—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices rotary with more than one shaft
    • B29B7/48—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices rotary with more than one shaft with intermeshing devices, e.g. screws
    • B29B7/488—Parts, e.g. casings, sealings; Accessories, e.g. flow controlling or throttling 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
    • 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
    • B29B7/46—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices rotary with more than one shaft
    • B29B7/48—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices rotary with more than one shaft with intermeshing devices, e.g. screws
    • B29B7/488—Parts, e.g. casings, sealings; Accessories, e.g. flow controlling or throttling devices
    • B29B7/489—Screws
    • 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
    • B29B7/80—Component parts, details or accessories; Auxiliary operations
    • B29B7/82—Heating or cooling
    • B29B7/826—Apparatus therefor
    • 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
    • B29B7/80—Component parts, details or accessories; Auxiliary operations
    • B29B7/88—Adding charges, i.e. additives
    • B29B7/90—Fillers or reinforcements, e.g. fibres
    • 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
    • B29C48/022—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the choice of material
    • 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
    • B29C48/285—Feeding the extrusion material to the extruder
    • B29C48/297—Feeding the extrusion material to the extruder at several locations, e.g. using several hoppers or using a separate additive feeding
    • 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
    • B29C48/40—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 two or more parallel screws or at least two parallel non-intermeshing screws, e.g. twin screw extruders
    • B29C48/402—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 two or more parallel screws or at least two parallel non-intermeshing screws, e.g. twin screw extruders the screws having intermeshing parts
    • 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
    • B29K2101/00—Use of unspecified macromolecular compounds as moulding material
    • B29K2101/10—Thermosetting resins
    • 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
    • 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
    • B29K2301/00—Use of unspecified macromolecular compounds as reinforcement
    • B29K2301/10—Thermosetting resins

Landscapes

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

Description

Die Erfindung betrifft einen kontinuierlichen Doppelschneckenextruder zur Verarbeitung von hitzehärtbaren Harzen mit zwei in einem Gehäuse angeordneten Schnecken, die nacheinander eine Einzugszone, eine Misch- oder Knetzone und eine Ausstoßzone bilden, wobei sich die Schnecken in entgegengesetztem Drehsinn und mit gleicher Rotatio"sgeschwindigkeit drehen.The invention relates to a continuous twin-screw extruder for processing thermosetting resins with two arranged in one housing Screws that successively form a feed zone, a mixing or kneading zone and an output zone, whereby the snails rotate in opposite directions and with the same rotation speed turn.

Es ist bereits ein Doppelschneckenextruder bekannt, mit dem auch hitzehärtbare Harze verarbeitet werden können. Bei diesem Extruder weisen die Schneckengänge im Bereich der Misch- oder Knetzone eine zur Förderrichtung entgegengesetzte Steigung auf, so daß das von der Einzugszone her in die Mischzone geförderte Material aufgestaut wird und dadurch einem hohen Druck und hohen Scherkräften unterworfen wird. Das in Pulverform eingesetzte Rohmaterial schmilzt infolge der in dieser Zone auftretenden hohen Temperaturen. Diese Temperaturen müssen jedoch bei der Verarbeitung hitzehärtbarer Harze genau kontrolliert werden, da sonst eine Aushärtung des Harzes im Extruder und eine Blockierung desselben die Folge ist Da in der Misch- und Knetzone des bekannten Extruders sehr hohe Scherkräfte auftreten, ist es beispielsweise nicht möglich den hitzehärtbaren Harzen faserige Füllstoffe beizugeben, da diese in der Misch- und Knetzone fein zerteilt werden und ihre Struktur verlieren. Für den Fall, daß die hitzehärtbaren Harze in flüssiger Form mit festen Füll- und Verstärkungsstoffen, wie beispielsweise Glasfasern vorliegen, kann der bekannte Extruder nicht eingesetzt werden, da dessen Misch- und Knetzone so ausgelegt ist, daß einerseits eine unkontrollierte Wärmemenge erzeugt wird und andererseits die Faserstruktur etwa beigegebener Füll- und Verstärkungsstoffe zerstört wird (US-PS 26 15 199),A twin screw extruder is already known, with which thermosetting resins can also be processed. In this extruder, the screw flights in the area of the mixing or kneading zone are facing Conveying direction opposite slope, so that that from the feed zone into the mixing zone conveyed material is dammed up and thereby subjected to high pressure and high shear forces will. The raw material used in powder form melts as a result of the high levels occurring in this zone Temperatures. However, these temperatures must be carefully controlled when processing thermosetting resins, otherwise the resin will harden in the Extruder and a blockage of the same the result is there in the mixing and kneading zone of the known Extruder very high shear forces occur, it is not possible, for example, the thermosetting resins add fibrous fillers, as these are finely divided in the mixing and kneading zone and their structure lose. In the event that the thermosetting resins are in liquid form with solid fillers and reinforcing materials, As, for example, glass fibers are present, the known extruder cannot be used because of it Mixing and kneading zone is designed so that on the one hand an uncontrolled amount of heat is generated and on the other hand, the fiber structure of any fillers and reinforcing materials added is destroyed (US Pat. No. 26 15 199),

Der Erfindung liegt die Aufgabe zugrunde, einen Extruder der eingangs bezeichneten Art zu schaffen, dessen Misch- und Knetzone so ausgebildet ist, daß zwar eine vollständige Durchmischung der eingesetzten Rohmaterialien erfolgt, diese Durchmischung aber so schonend durchgeführt wird, daß weder eine große Wärmemenge entsteht, noch die Struktur etwa eingesetzter Verstärkungsstoffe, wie Glasfasern, zerstört wird.The invention is based on the object of creating an extruder of the type specified at the outset, whose mixing and kneading zone is designed so that, although complete mixing of the used Raw materials takes place, but this mixing is carried out so gently that neither a large Amount of heat is generated, and the structure of any reinforcing materials used, such as glass fibers, is still destroyed will.

Erfindungsgemäß wird diese Aufgabe dadurch gelöst, daß die Schnecken in der Misch- und KnetzoneAccording to the invention, this object is achieved by that the snails are in the mixing and kneading zone hintereinander angeordnete Paddelabschnitte aufweisen, wobei in jedem Paddelabschnitt jeweils zwei Paddeln um 180" versetzt an der Schneckenwelle ansetzen und über ihre axiale Länge um 90" verdreht sind und die Bewegungsbahnen der Paddeln beiderhave paddle sections arranged one behind the other, with two in each paddle section Place the paddles on the worm shaft offset by 180 "and turn them by 90" along their axial length and the trajectories of both paddles

to Schnecken teilweise überlappen.to partially overlap the snails.

Durch diese Maßnahmen wird einerseits eine gute Durchmischung erreicht, andererseits ein Entweichen der durchmischten Stoffe in Förderrichtung ermöglicht, so daß die Entstehung übermäßiger ScherkräfteThese measures achieve good mixing on the one hand and escape on the other of the mixed substances in the conveying direction, so that excessive shear forces arise vermieden wird.is avoided.

Vorzugsweise können die Steigungen der Paddeln verschiedener Paddelabschnitte unterschiedlich sein. Damit kann die Fördercharakteristik und die Verweilzeit der Rohstoffe im Extruder den jeweiligenThe slopes of the paddles of different paddle sections can preferably be different. This means that the conveying characteristics and the dwell time of the raw materials in the extruder can be adapted to the respective

Stoffeigenschaften angepaßt werden.Material properties are adapted.

Dem erfindungsgemäßen Extruder können die hitzehärtbaren Harze in flüssiger Form, sowie Verstärkungs- und Füllstoffe in fester Form und weitere Additive, wie Weichmacher, direkt zugegeben werden.The extruder according to the invention can contain the thermosetting resins in liquid form, as well as reinforcing and fillers in solid form and others Additives such as plasticizers can be added directly.

Die Herstellung einer Vormischung entfällt Die Mischung der Ausgangsstoffe im Extruder kann jedoch so gesteuert werden, daß. beispielsweise die Faserstruktur von zugegebenen Glasfasern erhalten bleibt Nachfolgend ist eine Ausführungsform der ErfindungThere is no need to prepare a premix. However, the starting materials can be mixed in the extruder be controlled so that. For example, the fiber structure of added glass fibers is retained Following is one embodiment of the invention anhand der Zeichnung beispielsweise beschrieben. Darin zeigtFor example, described with reference to the drawing. In it shows

F i g. 1 die Draufsicht auf einen Extruder, der in seiner horizontalen Mittelebene aufgeschnitten ist, Fig.2 die Seitenansicht des Extiuders nach Fig. 1,F i g. 1 the top view of an extruder, which is cut open in its horizontal center plane, 2 shows the side view of the extender according to FIG. 1, der in seiner vertikalen Mittelebene aufgeschnitten ist undwhich is cut open in its vertical median plane and

F i g. 3 einen Querschnitt durch den Extruder entlang der Liniein-Ill in F i g. 2.F i g. 3 shows a cross section through the extruder along the line in-III in FIG. 2.

Der in den Zeichnungen dargestellte Extruder bestehtThe extruder shown in the drawings consists

im wesentlichen aus zwei Schnecken 1 und 2 und einem oder mehreren Zylindern.essentially of two screws 1 and 2 and one or several cylinders.

Wie in den Figuren gezeigt, sind die Schnecken 1 und 2 so ausgebildet, daß sie mit entgegengesetztem Drehsinn innerhalb der Zylinder rotieren, wobei sieAs shown in the figures, the screws 1 and 2 designed so that they rotate in opposite directions within the cylinder, whereby they durch beliebige Antriebsmittel (nicht dargestellt) über die mit Nuten 3 versehenen Wellenenden angetrieben werden. In diesem Zusammenhang wird darauf hingewiesen, daß in den Zeichnungen eine der Schnecken, z, B, die Schnecke 1, eine größere axiale Länge als diedriven by any drive means (not shown) via the shaft ends provided with grooves 3 will. In this context it is pointed out that in the drawings one of the screws, z, B, the worm 1, a greater axial length than that

so andere, z. B. Schnecke 2, aufweist, so daß die erstere in ihrem vorderen Ausstoßbereich wie in einer Einzelschneckenpresse ausgebildet ist, beide Schnecken 1 und 2 können jedoch auch gleiche axiale Längen aufweisen. Beide Schnecken 1 und 2 sind in axialer Richtung vonso others, z. B. screw 2, so that the former in its front discharge area is designed as in a single screw press, both screws 1 and 2 can, however, also have the same axial lengths. Both screws 1 and 2 are in the axial direction of

ihrem hinteren, mit Nuten versehenen Ende zu ihrem vorderen Ausstoßende gemäß ihrer Funktion und ihrer Form in verschiedene Zonen aufgeteilt. Diese Zonen sind der Reihe nach eine Einzugszone 4 oder 4a, in welcher die Rohrstoffe vorwärts gefördert werden, einetheir rear grooved end to their front discharge end according to their function and their Form divided into different zones. These zones are in turn a feed zone 4 or 4a, in which the raw materials are conveyed forward, a Misch- und Knetzone 5 oder 5a, in welcher die Rohstoffe ausführlich geknetet werden und eine Ausstoßzone 6 oder 6a, in welcher die gekneteten Rohstoffe unter Druck durch eine Ausstoßöffnung des Zylinders kontinuierlich ausgestoßen werden.Mixing and kneading zone 5 or 5a, in which the Raw materials are extensively kneaded and an ejection zone 6 or 6a, in which the kneaded Raw materials are continuously ejected under pressure through an ejection port of the cylinder.

Die Einzugszone 4 oder 4a wird von einer üblichen Förderschnecke gebildet, deren Abstand der Gewindegänge in achsparalleler Richtung für eine Drehung geeignet ist, wobei das Material in der gleichen WeiseThe feed zone 4 or 4a is of a conventional one Formed screw conveyor, the distance between the threads in the axis-parallel direction for rotation is suitable, with the material in the same way

vorwärts gefördert wird, wie dies von Extrudern für thermoplastische Kunststoffe bekannt ist- Pie beiden Einzugszonen 4 und 4a haben eine entgegengesetzte Steigung, Die Gewindegänge der Schnecken 1 und 2 stehen in den Einzugszonen 4, 4a miteinander im Eingriff.is conveyed forward, as is known from extruders for thermoplastics - Pie both Feed zones 4 and 4a have an opposite pitch, the threads of screws 1 and 2 are in engagement with one another in the feed zones 4, 4a.

Die Misch- und Knetzonen 5 oder 5a werden von einer Reihe von Paddelabschnitten mit jeweils der Länge B gebildet (siehe Fig.2). Die Ausbildung der Querschnitte dieser Bereiche entspricht im allgemeinen derjenigen der Flügel des bekannten diskontinuierlich betriebenen Banbury-Mischers, der in F i g. 3 gezeigt ist, wobei nach entgegengesetzten Seiten ragende Flügel jedes Bereiches innerhalb dcf Länge B oder an beiden Enden in einem Winkel von 90° einander entgegengesetzt verdreht sind, wie dies in den F i g. 1 und 2 gezeigt ist Die Anzahl der Paddelabschnitte kann nach Wunsch ausgewählt werden. Die Steigungswinkel zwischen aufeinander folgenden Abschnitten können ebenfalls verändert oder sogar umgekehrt werden, um einen optimalen Wirkungsgrad für den Knetvorgang zu erhalten, abhängig von der Art des zu kne'enden Materials.The mixing and kneading zones 5 or 5a are formed by a series of paddle sections each with the length B (see FIG. 2). The design of the cross-sections of these areas generally corresponds to that of the blades of the known discontinuously operated Banbury mixer, which is shown in FIG. 3 is shown, with opposite sides projecting wings of each area within dcf length B or at both ends at an angle of 90 ° in opposite directions, as shown in FIGS. 1 and 2. The number of paddle sections can be selected as desired. The angle of inclination between successive sections can also be changed or even reversed in order to obtain an optimal degree of efficiency for the kneading process, depending on the type of material to be kneaded.

Die Ausstoßzone 6 oder 6a weist eine bekannte Förderschnecke auf, deren Gewindegänge, ihrer Drehung entsprechend, eine solche Steigung haben, daß die gekneteten Stoffe unter Druck zu der Ausstoßöffnung des Zylinders transportiert werden. Die Ausstoßzone 6 oder 6a ist in ihrer Ausbildung ähnlich der Einzugszone 4 oder 4a, jedoch ist der Abstand der Gewindegänge in achsparalleler Richtung kleiner und wenigstens einer seiner Teile hat eine wesentlich größere axiale Länge als die Einzugszone 4 od^J 4a.The discharge zone 6 or 6a has a known screw conveyor, the threads of which, corresponding to their rotation, have such a pitch that the kneaded materials are transported under pressure to the discharge opening of the cylinder. The ejection zone 6 or 6a is similar in its design to the feed zone 4 or 4a, but the distance between the threads in the axis-parallel direction is smaller and at least one of its parts has a significantly greater axial length than the feed zone 4 or 4a.

Der Zylinder, in dem sich die drehbaren Schnecken 1 und 2 befinden, besteht aus zwei Teilen, d.h. einem hinteren Zylinder 7 und einem vorderen Zylinder 8, wobei der hintere Zylinder 7 beide Schnecken 1 und 2 enthält, und der vordere Zylinder 8 nur die Schnecke 1.The cylinder in which the rotating screws 1 and 2 are located consists of two parts, i.e. one rear cylinder 7 and a front cylinder 8, the rear cylinder 7 having both screws 1 and 2 contains, and the front cylinder 8 only the screw 1.

In der oberen Wand des hinteren Zylinders 7 naheIn the upper wall of the rear cylinder 7 close

den mit Nuten versehenen Wellenenden der Schnecken in einem Bereich, welcher der Einzugszone 4 und 4a der Schnecken 1 und 2 entspricht, sind Eingabeöffnungen 9, 10 und 11 für das Rohmaterial eng aneinanderliegend zwischen den Mittellinien der beiden Schnecken 1 und 2 in axialer Richtung der Zylinder 7 und 8 angeordnet. Bei der gezeigten Ausführungsform sind drei Rohmaterialbeschickungsöffnungen 9,10 und 11 für hitzehärtbares Harz bzw. Füllstoffe bzw. Verstärkungsmaterialien vorgesehen. the grooved shaft ends of the screws in an area which corresponds to the feed zone 4 and 4a of the screws 1 and 2, there are input openings 9, 10 and 11 for the raw material close to one another between the center lines of the two screws 1 and 2 in the axial direction of the cylinders 7 and 8 arranged. In the embodiment shown, three raw material charging openings 9, 10 and 11 are provided for thermosetting resin or fillers or reinforcing materials.

Der vordere Zylinder 8 ist an seinem Ende offen, wodurch eine Ausstoßöffnung gebildet wird, welche so ausgebildet ist, daß ein Strangpreßwerkzeug lösbar daran befestigt werden kann, um das geknetete Material direkt im Anschluß an seinen Ausstoß aus dem Extruder durch die Ausstoßöffnung zu formen.The front cylinder 8 is open at its end, whereby a discharge port is formed, which so is designed so that an extrusion die can be releasably attached to the kneaded material to be formed through the discharge opening immediately following its discharge from the extruder.

Der hintere und vordere Zylinder 7 und 8 ist außen jeweils mit Doppelmänteln 12 versehen, um die Temperatur des im Inneren befindlichen Materials zu steuern.The rear and front cylinders 7 and 8 is provided on the outside with double jackets 12 to the Control the temperature of the material inside.

Der beschriebene Extruder arbeitet wie folgt:The extruder described works as follows:

Die Rohstoffe, wie hitzehärtbares Harz, Füllstoffe, Weichmacher, Verstärkungsmaterialien usw., werden in geeigneter Weise durch die Materialbeschickungsörfnungen 9, 10 und 11 in den hinteren Zylinder 7 eingespeisc und durch die Arbeitsweise der Einzugszonen 4,4a der Schnecken 1 und 2, die sich in dem hinteren Zylinder 7 einander entgegengesetzt drehen, nach vorne in die Misch- und Knetzone 5 und Sa der Schnecken 1 und 2 gefördert Dort werden die Rohstoffe völlig durchgeknetet, um dann weiter in die Ausstoßzonen 6, 6a der Schnecken 1 und 2 gefördert zu werden. Anschließend werden die gekneteten Stoffe kontinuierlich unter Druck durch die Ausstoßöffnung des Extruders extrudieit Gegebenenfalls können die Materialien in Produkte geformt werden, wenn sie durch ein geeignetes Strangpreßwerkzeug extrudiert werden, das an der Ausstoßöffnung des Zylinders 8 befestigt istThe raw materials, such as thermosetting resin, fillers, plasticizers, reinforcing materials, etc., are suitably fed into the rear cylinder 7 through the material feed orifices 9, 10 and 11 and through the operation of the feed zones 4,4a of the screws 1 and 2, which are Rotate in opposite directions in the rear cylinder 7, conveyed forward into the mixing and kneading zone 5 and Sa of the screws 1 and 2 There the raw materials are completely kneaded in order to be conveyed further into the discharge zones 6, 6a of the screws 1 and 2 . Thereafter, the kneaded materials are continuously extruded under pressure through the discharge port of the extruder

Hierzu 1 Blatt Zeichnui.genFor this purpose 1 sheet of drawing

Claims (2)

Patentansprüche;Claims; J1 Kontinuierlicher Doppelschneckenextruder zur Verarbeitung von hitzehärtbaren Harzen mit zwei in einem Gehäuse angeordneten Schnecken, die nacheinander eine Einzugszone, eine Misch- und Knetzone und eine Ausstoßzone bilden, wobei sich die Schnecken in entgegengesetztem Drehsinn und mit gleicher Rotationsgeschwindigkeit drehen, dadurch gekennzeichnet, daß die Schnecken (1, 2) in der Misch- und Knetzone (5, 5a) hintereinander angeordnete Paddelabschnitte aufweisen, wobei in jedem Paddelabschnitt jeweils zwei Paddeln um 180" versetzt an der Schneckenwelle ansetzen und über ihre axiale Länge (B) um 90° verdreht sind und die Bewegungsbahnen der Paddeln beider Schnecken (1, 2) sich teilweise überlappen.J 1 Continuous twin-screw extruder for processing thermosetting resins with two screws arranged in a housing, which successively form a feed zone, a mixing and kneading zone and an ejection zone, the screws rotating in opposite directions and at the same speed, characterized in that the Screws (1, 2) in the mixing and kneading zone (5, 5a) have paddle sections arranged one behind the other, two paddles being offset by 180 "on the worm shaft in each paddle section and rotated by 90 ° over their axial length (B) and the movement paths of the paddles of the two snails (1, 2) partially overlap. 2. Kontinuierlicher Doppelschneckenextruder nach Anspruch 1, dadurch gekennzeichnet, daß die Steigungen dei Paddeln verschiedener Paddelabschnitte unterschiedlich sind.2. Continuous twin screw extruder according to claim 1, characterized in that the Slopes of the paddles of different paddling sections are different.
DE2533195A 1975-07-24 1975-07-24 Continuous twin screw extruder Expired DE2533195C3 (en)

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EP0309410B1 (en) * 1987-09-25 1993-09-01 Ciba-Geigy Ag Process for the manufacture of a heat-curable, meltable mixture, installation for carrying it out and suitable extruder inlet chamber for use in the latter
DE4122912A1 (en) * 1991-07-11 1993-01-14 Theysohn Friedrich Fa DOUBLE SCREW EXTRUDER
CN106743213A (en) * 2017-04-01 2017-05-31 南京锎巴新材料科技有限公司 A kind of twin-screw for being stirred for highly viscous slurry grinding distribution and being conveyed

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