DE2529707A1 - Plastics compounding appts. - has axially displaceable screw having exchangeable shearing section - Google Patents
Plastics compounding appts. - has axially displaceable screw having exchangeable shearing sectionInfo
- Publication number
- DE2529707A1 DE2529707A1 DE19752529707 DE2529707A DE2529707A1 DE 2529707 A1 DE2529707 A1 DE 2529707A1 DE 19752529707 DE19752529707 DE 19752529707 DE 2529707 A DE2529707 A DE 2529707A DE 2529707 A1 DE2529707 A1 DE 2529707A1
- Authority
- DE
- Germany
- Prior art keywords
- screw
- shear
- plasticizing
- exchangeable
- axially displaceable
- 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.)
- Pending
Links
- 229920003023 plastic Polymers 0.000 title claims abstract description 8
- 239000004033 plastic Substances 0.000 title claims abstract description 8
- 238000010008 shearing Methods 0.000 title claims abstract 5
- 238000013329 compounding Methods 0.000 title abstract 3
- 238000010438 heat treatment Methods 0.000 claims abstract description 4
- 238000000034 method Methods 0.000 claims description 12
- 239000000155 melt Substances 0.000 claims description 2
- 238000001816 cooling Methods 0.000 abstract 1
- 230000001771 impaired effect Effects 0.000 abstract 1
- 238000000465 moulding Methods 0.000 abstract 1
- 238000001746 injection moulding Methods 0.000 description 4
- 230000033001 locomotion Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 241000237858 Gastropoda Species 0.000 description 1
- 238000000071 blow moulding Methods 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000003292 diminished effect Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000010006 flight Effects 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 238000010102 injection blow moulding Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 239000012899 standard injection Substances 0.000 description 1
- 230000008719 thickening Effects 0.000 description 1
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
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/46—Means for plasticising or homogenising the moulding material or forcing it into the mould
- B29C45/58—Details
- B29C45/60—Screws
-
- 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
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/46—Means for plasticising or homogenising the moulding material or forcing it into the mould
- B29C45/47—Means for plasticising or homogenising the moulding material or forcing it into the mould using screws
- B29C45/50—Axially movable 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
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/46—Means for plasticising or homogenising the moulding material or forcing it into the mould
- B29C45/47—Means for plasticising or homogenising the moulding material or forcing it into the mould using screws
- B29C45/50—Axially movable screw
- B29C45/52—Non-return devices
- B29C2045/528—Mixing means forming part of or in close proximity to the non-return valve
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
- Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
Abstract
Description
Verfahren und Vorrich;;uS ~1,uTL Plastifizieren von Kunststoffen in Systemen mit axial verschieblicher Schnecke.Process and device ;; uS ~ 1, uTL Plasticizing of plastics in Systems with an axially displaceable screw.
Gegenstand der Erfindung ist ein Verfahren und eine Vorrichtung zum Plastifizieren von Kunststoffen in Systemen mit axial verschieblicher Schnecke bzw. einer "Schubschnecke." Derartige Systeme werden bei Spritzgießmaschinen und Hohlkörperblasmaschinen eingesetzt. Bei marktgängigen Spritzgieß- und Hohlkörperblasmaschinen mit einem sogenannten "Schneckenkolben" erfolgt die Plastifizierung des für das Spritzteil bzw. für den Vorformling benötigten Materials durch Rotation der Schnecke und deren gleichzeitige Axialbewegung entgegen einem einstellbaren Staudruck im Hydrauliksystem der Maschine. Dabei sammelt sich das Plastifikat vor der Schneckenspitze im Stauraum. Dieser Dosiervorgang wird durch Abschalten der Schneckenrotation beendet. Danach wird beim Spritzgießprozess die im Stauraum befindliche plastifizierte Masse durch Axialverschiebung der Schnecke, bewirkt durch den Spritzdruck im Hydraulikzylinder, in das Werkzeug gespritzt. Beim Hohlkörperblasen mit#S#hubschnecke #ird das Plastitikat zur bildung ies Vorformlings aus der Düse gepressx.The invention relates to a method and a device for Plasticizing of plastics in systems with axially displaceable screw or a "thrust screw." Such systems are used in injection molding machines and blow molding machines used. In the case of standard injection molding and blow molding machines with a The so-called "screw piston" is used for the plasticization of the molded part or material required for the preform by rotating the screw and its simultaneous axial movement against an adjustable dynamic pressure in the hydraulic system the machine. The plasticate collects in the storage space in front of the screw tip. This dosing process is ended by switching off the screw rotation. Thereafter During the injection molding process, the plasticized material in the storage space is penetrated Axial displacement of the screw, caused by the injection pressure in the hydraulic cylinder, injected into the tool. When blowing hollow bodies with # S # helical snail #, the plasticate becomes Pressed to form this preform from the nozzle.
Infolge des intermittierend erfolgenden Plastifiziervorgangs und der damit verbundenen Verkürzung der wirksnen Schneckenlänge ist die Temperatur der gegen Ende der Plastifizierphase in den Stauraum geförderten Nasse niedriger als die des Vormaterials.#Diese Temperaturunterschiede in der Massevorlage können Jedoch die Qualität des Fertigprodukts beeinträchtigen.As a result of the intermittent plasticizing process and the The associated shortening of the effective screw length is the temperature of the towards the end of the plasticizing phase in the storage space is lower than that of the raw material affect the quality of the finished product.
Das Absinken der Massetemperaturen gegen Ende des Plastifiziervorgangs kann durch gezielte Steuerung des Staudruckes und der Schneckendrehzahl in bekannter Weise vermindert werden. Nachteilig ist dabei der erhebliche steuerungstechnische Aufwand.The drop in melt temperatures towards the end of the plasticizing process can through targeted control of the back pressure and the screw speed in known Way to be diminished. The disadvantage here is the considerable technical control Expenditure.
Nach der Erfindung läßt sich mit geringem Aufwand, nämlich durch geeignete konstruktive Ausführung der Schneckenspitze und des Plastifizierzylinders, eine ausreichende Konstanz der Massetemperatur im Stauraum erreichen, wobei die Schneckendrehzahl während der Plastifizierphase auf einen festen Wert eingestellt wird. Der Staudruck kann, muß aber nicht konstant gehalten werden.According to the invention can be with little effort, namely by suitable structural design of the screw tip and the plasticizing cylinder, one Achieve sufficient constancy of the mass temperature in the storage space, with the screw speed is set to a fixed value during the plasticizing phase. Of the Back pressure can, but does not have to be kept constant.
Nach der Erfindung ist die Schneckenspitze mit einem zylindrischen, konischen oder profilierten Scherteil versehen, während der Zylinder in diesem Bereich auf einen größeren Durchmesser als den Nenndurchmesser der Schnecke erweitert ist. Auf diese Weise wird während des Plastifiziervorgangs am Schneckenende ein in seiner Länge zunehmender Scherspalt gebildet. Durch geeignete Wahl der Scherteillange und der Scherspaltweite kann das axiale Temperaturprofil im Stauraum ausgeglichen werden, da während der Plastifizierphase die Scherspaltlänge und damit die Schererwärmung in diesem Spalt zunimmt. Die Zunahme der Scherspaltlänge bewirkt außerdem ein Ansteigen der Rückströmung in den Schneckengängen, da die Schnecke gegen einen ansteigenden Strömungswiderstand fördert. Durch diesen Effekt wird die Kunststoffmasse in den Schneckengängen intensiver geschert und somit ebenfalls stärker erwärmt. Bei konischer Ausbildung, das heißt Verdickung nach dem freien Ende des Scherteils, ergibt sich eine weitere Zunahme der Schererwärmung durch die in Richtung zur Schneckenspitze abnehmende Spaltweite. Um beim Spritzgießen während des Eins#ritzvorgangs ein Rückströmen der Schmelze zu vermeiden, kann das Scherteil in Verbindung mit einer Rückstromsperre eingesetzt werden. Weiter ist zur Verbesserung der thermischen Homogenität des Plastifikats eine Kombination mit einem Mischteil möglich.According to the invention, the screw tip with a cylindrical, conical or profiled shear part, while the cylinder is in this area is expanded to a larger diameter than the nominal diameter of the screw. In this way, during the plasticizing process at the end of the screw one in his Length of increasing shear gap formed. By suitable choice of the shear length and the shear gap width, the axial temperature profile in the storage space can be compensated, because during the plasticizing phase the shear gap length and thus the shear heating increases in this gap. The increase in the shear gap length also causes an increase the backflow in the screw flights, as the screw is against a rising Flow resistance promotes. Due to this effect, the plastic mass is in the The worm threads are sheared more intensely and thus also heated more intensely. With conical Training, that is, thickening after the free end of the shear part, results a further increase in shear heating due to the movement towards the screw tip decreasing gap width. To prevent backflow during the injection molding process To avoid the melt, the shear part can be combined with a non-return valve can be used. Next is to improve the thermal homogeneity of the plasticate a combination with a mixing part is possible.
Die Zeichnungen stellen mehrere Ausführungsbeispiele der Brf ndung dar.The drawings represent several exemplary embodiments of the invention represent.
Fi#. 1 zeigt schematisch einen Teil de s P1 des Plastifizieraggregats mit der erfindungsgemäßen Ausbildung von Schneckenspitze und Zylinder, a) bei Beginn und b) nach Ende des Plastifiziervorgangs.Fi #. 1 shows schematically part of the P1 of the plasticizing unit with the inventive design of the screw tip and cylinder, a) at the beginning and b) at the end of the plasticizing process.
Im Zylinder 1 mit der Erweiterung 2 befindet sich die Plastifizlerschnecke 3 mit dem Scherteil 4. Mit H ist der maximale Schneckenhub, mit s die Scherspaltweite, mit Lsch die Lange des Scherteils bezeichnet. Während des Plastifiziervorgangs taucht das Scherteil in den Zylinder mit dem Durchmesser D ein und bildet den variablen Scherspalt.The plasticizing screw is located in cylinder 1 with extension 2 3 with the shear part 4. With H the maximum screw stroke, with s the shear gap width, Lsch denotes the length of the shear part. Submerges during the plasticizing process the shear part in the cylinder with the diameter D and forms the variable Shear gap.
Piff. 2 zeigt schematisch eine Ausführung mit konischem Scherteil.Whistle. 2 shows schematically an embodiment with a conical shear part.
Die Spaltweite verringert sich dabei von s1 auf Fig. 3 zeigt schematisch eine Ausführung, bei der das Scherteil in Verbindung mit einem Mischteil 5 und einer Rückstromsperre 6 eingesetzt wird. Das Scherteil besteht aus Segmenten, die zur Veränderung der Scherteillänge Lsch gegen Schneckensegmente 8 ausgetauscht werden können. Durch den Durchmesser der Segmente des Scherteils 7 kann die Spaltweite s variiert werden.The gap width is reduced from s1 to FIG. 3 shows schematically an embodiment in which the shear part in conjunction with a mixing part 5 and a Non-return valve 6 is used. The shear part consists of segments that lead to Changing the shear length Lsch can be exchanged for screw segments 8 can. Through the diameter of the segments of the shear part 7, the gap width s can be varied.
Claims (3)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19752529707 DE2529707A1 (en) | 1975-07-03 | 1975-07-03 | Plastics compounding appts. - has axially displaceable screw having exchangeable shearing section |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19752529707 DE2529707A1 (en) | 1975-07-03 | 1975-07-03 | Plastics compounding appts. - has axially displaceable screw having exchangeable shearing section |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE2529707A1 true DE2529707A1 (en) | 1977-01-20 |
Family
ID=5950588
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DE19752529707 Pending DE2529707A1 (en) | 1975-07-03 | 1975-07-03 | Plastics compounding appts. - has axially displaceable screw having exchangeable shearing section |
Country Status (1)
| Country | Link |
|---|---|
| DE (1) | DE2529707A1 (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3147723A1 (en) * | 1980-12-15 | 1982-09-02 | Comind S.p.A. Azienda Stars, Villastellone, Torino | Mixing and homogenizing apparatus for transfer moulding presses and extruders for thermoplastic materials, comprising a plasticizing chamber and a plasticizing screw |
| DE3910132A1 (en) * | 1988-04-21 | 1989-11-09 | Schwerin Plastmaschinen | Plasticising screw and mixing device for the direct processing and colouring of mixtures of reclaimed plastic and of primary plastics materials on injection-moulding machines |
| JP2007160792A (en) * | 2005-12-15 | 2007-06-28 | Spiral Logic Ltd | Screw, injection apparatus and pressure member |
| RU2324592C2 (en) * | 2006-06-19 | 2008-05-20 | ГОУ ВПО Тамбовский государственный технический университет | Screw plasticator for polymer materials |
| DE102010024267A1 (en) * | 2010-06-18 | 2011-12-22 | Kraussmaffei Technologies Gmbh | Method for manufacturing plastic-mold parts, involves controlling back pressure and/or rotational speed of plasticizing screw and/or heating of plasticizing cylinder such that plastic melt has negative axial temperature gradient |
| CN109794214A (en) * | 2019-01-24 | 2019-05-24 | 太原理工大学 | A kind of high shear force polymer chain scission method and scissors type high shear force chemical reactor |
-
1975
- 1975-07-03 DE DE19752529707 patent/DE2529707A1/en active Pending
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3147723A1 (en) * | 1980-12-15 | 1982-09-02 | Comind S.p.A. Azienda Stars, Villastellone, Torino | Mixing and homogenizing apparatus for transfer moulding presses and extruders for thermoplastic materials, comprising a plasticizing chamber and a plasticizing screw |
| DE3910132A1 (en) * | 1988-04-21 | 1989-11-09 | Schwerin Plastmaschinen | Plasticising screw and mixing device for the direct processing and colouring of mixtures of reclaimed plastic and of primary plastics materials on injection-moulding machines |
| JP2007160792A (en) * | 2005-12-15 | 2007-06-28 | Spiral Logic Ltd | Screw, injection apparatus and pressure member |
| EP1961550A4 (en) * | 2005-12-15 | 2010-12-08 | Sumitomo Heavy Industries | SNAIL, SPRAYER AND PRESSURE MEMBER |
| US7934923B2 (en) | 2005-12-15 | 2011-05-03 | Sumitomo Heavy Industries, Ltd. | Screw, injection apparatus, and pressure member |
| KR101039538B1 (en) * | 2005-12-15 | 2011-06-09 | 스파이럴 로직 리미티드 | Screw, Injection Device and Pressure Member |
| RU2324592C2 (en) * | 2006-06-19 | 2008-05-20 | ГОУ ВПО Тамбовский государственный технический университет | Screw plasticator for polymer materials |
| DE102010024267A1 (en) * | 2010-06-18 | 2011-12-22 | Kraussmaffei Technologies Gmbh | Method for manufacturing plastic-mold parts, involves controlling back pressure and/or rotational speed of plasticizing screw and/or heating of plasticizing cylinder such that plastic melt has negative axial temperature gradient |
| CN109794214A (en) * | 2019-01-24 | 2019-05-24 | 太原理工大学 | A kind of high shear force polymer chain scission method and scissors type high shear force chemical reactor |
| CN109794214B (en) * | 2019-01-24 | 2020-11-27 | 太原理工大学 | A kind of high shear force polymer chain scission method and scissors type high shear force chemical reactor |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| OHJ | Non-payment of the annual fee |