WO1997023335A1 - Vis d'extrudeuse - Google Patents

Vis d'extrudeuse Download PDF

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Publication number
WO1997023335A1
WO1997023335A1 PCT/EP1996/005781 EP9605781W WO9723335A1 WO 1997023335 A1 WO1997023335 A1 WO 1997023335A1 EP 9605781 W EP9605781 W EP 9605781W WO 9723335 A1 WO9723335 A1 WO 9723335A1
Authority
WO
WIPO (PCT)
Prior art keywords
screw
barrier elements
web
overflow area
barrier
Prior art date
Application number
PCT/EP1996/005781
Other languages
German (de)
English (en)
Inventor
Markus Bauer
Peter Karlinger
Erwin BÜRKLE
Original Assignee
Krauss-Maffei Ag
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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=7781274&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=WO1997023335(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Krauss-Maffei Ag filed Critical Krauss-Maffei Ag
Publication of WO1997023335A1 publication Critical patent/WO1997023335A1/fr

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
    • 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
    • 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
    • B29C48/505—Screws
    • B29C48/53—Screws having a varying channel depth, e.g. varying the diameter of the longitudinal screw trunk
    • 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
    • B29C48/505—Screws
    • B29C48/565—Screws having projections other than the thread, 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
    • B29C48/03—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

Definitions

  • the invention relates to a screw for processing plastics according to the preamble of patent claim 1.
  • Such screws are used in particular for injection units of injection molding machines and are used to convey, compact, mix and plasticize or melt granular plastic material.
  • the single- or multi-flight screw rotates in a screw cylinder, the inner wall of which is at a relatively small distance from the screw webs, so that the material to be processed is transported through the screw flights and deformed and opened by shear and frictional forces is heated.
  • the screw cylinder can also be heated from the outside.
  • a snail of the type mentioned is known from DE 3630208 AI. After a start area, this worm has a two-start section in which a barrier web with an incline different from the worm web is inserted between the actual worm web.
  • This barrier web has a lower height than the screw web and thus forms an overflow for molten material.
  • the overflow is designed to be relatively small in order to allow only melt to overflow from one passage into the other. Because of this, the screw works very dependent on the operating point, and it cannot guarantee thorough mixing, so that additional mixing elements generally have to be provided at the screw tip, which results in an undesired extension of the screw.
  • US-A-4405239 shows a multi-start screw of adjoining screw flights which have opposing depths in such a way that the material is forced to overflow, whereby the energy content is to be increased.
  • the melt in the passages is not mixed sufficiently, and the shear zone (overflow) must always be carried out in two courses. Because of the complicated screw geometry, the production of this screw is very complex.
  • the invention is therefore based on the object of improving a screw for plastics processing in such a way that melting which is gentle on the material and good mechanical and thermal mixing are achieved at high throughput or high output.
  • the barrier elements introduced into the screw flights according to the invention on the one hand cause the material to be dammed up, and on the other hand to distribute or flow the material flow over the overflow areas. This leads to a gentle introduction of energy and causes an additional mixing of the material in the screw flight or, in the case of multi-flight screws, in the screw flights. To- the advantage of a better color pigment distribution results immediately.
  • 1 is a schematic side view of a snail
  • Fig. 3 is an enlarged view of one end of a
  • Fig. 5 is a schematic representation of an arcuate arrangement of barrier elements.
  • a screw 1 according to the invention comprises three zones, namely a feed zone A, a conversion zone B and an ejection zone C.
  • the screw has two threads, but it can also be single-thread.
  • Helical webs 10, 20 are formed on the screw core 2 in a helical manner, which delimit screw flights 15, 25.
  • barrier elements 30 are arranged in a worm thread in the second third of the conversion zone B and in a region of the discharge zone C.
  • the barrier elements 30 can be designed as pins 31 protruding radially above the screw core, the pin diameter and pin spacing being freely selectable and being adaptable to the processing conditions.
  • the pins 31 preferably have the same height as the screw webs 10 or 20, but they can also be made lower.
  • the screw flight 10 On the active side (assigned to the feed zone), the screw flight 10 is designed as an overflow area 50 in which the height of the screw flight is reduced.
  • This overflow area begins after a preceding barrier element and ends shortly before or shortly after a subsequent barrier element or in the area between two barrier elements.
  • this shear gap formed by the overflow area can also be partially broken through, for example by deep grooves (not shown).
  • the height of the shear gap can be constant or decrease towards the screw tip.
  • the distances between the barrier elements are constant in FIG. 2, but can in principle be chosen freely, and the zones can be repeated as required.
  • FIG 3 shows an alternative embodiment in which the barrier elements are designed in the form of webs 40.
  • the webs 40 run transversely to the running direction of the screw flight 25 and are preferably designed to be lower than the screw flight.
  • On the right and left of each web there are perforations in the form of deep grooves 41, which create better mixing.
  • the individual webs can also be divided by further grooves (not shown).
  • the barrier elements narrow the respective screw flight, but allow a limited passage of material under shear.
  • the material is jammed by the barrier elements and partly forced over the assigned overflow area into the area (with regard to the feed zone) in front of the relevant barrier element.
  • an overflow area is provided on only one side of the barrier element, namely on the screw web located on the feed side, so that the material is forced against the actual conveying direction of the screw.
  • the dimensioning of the barrier elements or the shear gap are preferably chosen such that only plasticized material or melt is forced through the shear gap. This results in good mixing on the one hand, and high energy input on the other. Since the barrier elements are easy to attach, the screw according to the invention can be manufactured relatively easily and inexpensively.
  • FIG. 4 shows a further embodiment of the invention, the barrier elements 30 being in the form of individual pins 31 spaced apart from one another.
  • the pins 31 are arranged in a kind of linear, straight arrangement obliquely to the direction of flow in the screw flight.
  • the linear arrangement is illustrated by the dashed line G which, with the screw web 20, which has an overflow region 50, encloses an angle ⁇ , the angle being 90 90 °, preferably ⁇ 45 °. Due to the oblique arrangement of the barrier element 30 or the pins 31, an additional effect occurs in that the material flow is not only dammed up, but also additionally directed in the direction of the overflow 50.
  • coarser particles or areas not yet melted in the material flow are held on the pins 31 and flow to the overflow area 50 as a partial flow (represented by arrows 120). Parts of the material flow that have already melted can pass through the barrier element 30 (represented by the arrows 110) and are transported further. Because of the oblique arrangement, coarser particles or areas that have not yet melted remain in contact with the barrier element 30 or its pins 31 for a longer time, so that the material is processed or mixed even more effectively.
  • the pins 31 are arranged along an arc H, the arc H adjoining a screw web 10 connects approximately tangentially to an overflow region 50 and abuts the screw web 20 at the end of the overflow region 50 approximately perpendicularly.
  • the partial flow which is directed to the overflow area 50, is in contact with the barrier element 30 or its pins even longer, so that the mixing action and the melting action are increased still further and thus the action of the screw is further increased .
  • FIG. 5 A further alternative embodiment is also indicated in FIG. 5, the pins of the barrier element also being arranged on an arc H ', which, however, extends approximately perpendicularly from the screw web 10 opposite the overflow area 50 and is approximately tangential connects the screw flight 20 adjacent to the overflow area 50.
  • H ' extends approximately perpendicularly from the screw web 10 opposite the overflow area 50 and is approximately tangential connects the screw flight 20 adjacent to the overflow area 50.
  • the material flow with coarser particles or non-melted areas is directed towards the overflow area 50, whereby melted material can pass through the barrier element.
  • FIGS. 4 and 5 have the additional advantage that so-called "dead zones" can hardly be formed in front of the barrier elements. Dead zones can arise from the fact that material which has not yet melted collects in vertical geometries directly in front of a barrier element or a pin and remains there because there are no opposing forces acting obliquely to the barrier elements.
  • line forces act in the direction of the overflow area 50, these line forces being directed obliquely to the barrier elements, so that no material can accumulate stationary in front of the barrier elements. This effect also increases the effectiveness of the screw according to the invention.
  • the barrier elements 30 are constructed by pins 31, of course they can Barrier elements can also be constructed, for example in the embodiment of FIG. 3, by webs, interrupted webs, etc. It is also possible here to use a plurality of rows of barrier elements, for example in accordance with the embodiment in FIG. 2.
  • the overflow area 50 is also not limited to a special embodiment. It can be formed in the form of lower screw flights, by interrupted flights or also by pins; several rows of pins are also conceivable here.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)

Abstract

L'invention concerne une vis (1) d'extrudeuse à un ou à plusieurs filets, utilisée pour le traitement de matières plastiques. Ladite vis extrudeuse comporte des éléments faisant barrière (30) dans un filet et une zone (50) de transition avec un filet adjacent, cela sur chaque élément barrière. La matière est partiellement empêchée de s'écouler dans le filet et partiellement introduite de force dans le filet adjacent, ce qui permet d'obtenir d'une part un bon mélange et d'autre part un bon transfert d'énergie.
PCT/EP1996/005781 1995-12-22 1996-12-20 Vis d'extrudeuse WO1997023335A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19548524A DE19548524C2 (de) 1995-12-22 1995-12-22 Schnecke zur Verarbeitung von Kunststoffen
DE19548524.6 1995-12-22

Publications (1)

Publication Number Publication Date
WO1997023335A1 true WO1997023335A1 (fr) 1997-07-03

Family

ID=7781274

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP1996/005781 WO1997023335A1 (fr) 1995-12-22 1996-12-20 Vis d'extrudeuse

Country Status (2)

Country Link
DE (1) DE19548524C2 (fr)
WO (1) WO1997023335A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19907118C1 (de) 1999-02-19 2000-05-25 Krauss Maffei Kunststofftech Spritzgießvorrichtung für metallische Werkstoffe
DE102005054265A1 (de) * 2005-11-11 2007-05-16 Krauss Maffei Kunststofftech Extruderschnecke
DE102006011068A1 (de) * 2006-03-08 2007-09-13 Krauss-Maffei Kunststofftechnik Gmbh Extruderschnecke
DE102006011069A1 (de) * 2006-03-08 2007-09-13 Krauss-Maffei Kunststofftechnik Gmbh Extruderschnecke mit verbesserten Eigenschaften

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3487503A (en) * 1967-06-28 1970-01-06 Midland Ross Corp Auger-type extruder
US3632254A (en) * 1970-01-14 1972-01-04 Dart Ind Inc Apparatus for producing fiber reinforced plastics
US3671141A (en) * 1971-01-08 1972-06-20 Midland Ross Corp Extruder comprising a screw having pegs
US3687423A (en) * 1968-12-21 1972-08-29 Werner & Pfleiderer Continuously operating screw machine for the treatment of plastic masses

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2256902C2 (de) * 1972-11-20 1978-05-18 Werner & Pfleiderer, 7000 Stuttgart Kontinuierlich arbeitende Schneckenmaschine
DE2608307B2 (de) * 1976-02-28 1978-08-03 Hermann Berstorff Maschinenbau Gmbh, 3000 Hannover Mehrgängige Extruderschnecke
US4405239A (en) * 1982-04-13 1983-09-20 Chung Chan I Energy efficient extruder screw
US4733970A (en) * 1985-09-09 1988-03-29 Sterling Extruder Corporation Extruder screw

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3487503A (en) * 1967-06-28 1970-01-06 Midland Ross Corp Auger-type extruder
US3687423A (en) * 1968-12-21 1972-08-29 Werner & Pfleiderer Continuously operating screw machine for the treatment of plastic masses
US3632254A (en) * 1970-01-14 1972-01-04 Dart Ind Inc Apparatus for producing fiber reinforced plastics
US3671141A (en) * 1971-01-08 1972-06-20 Midland Ross Corp Extruder comprising a screw having pegs

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
"DER EXTRUDER - GRUNDLAGE FUR QUALITAT UND WIRTSCHAFTLICHKEIT", PLASTVERARBEITER, vol. 40, no. 7, 1 July 1989 (1989-07-01), pages 116, 118, 120, 122/123, XP000104045 *
"Neuentwickelte Hochleistungsschnecke", KUNSTSTOFFE, vol. 59, no. 2, February 1969 (1969-02-01), MUNCHEN DE, pages 93, XP002028959 *

Also Published As

Publication number Publication date
DE19548524A1 (de) 1997-06-26
DE19548524C2 (de) 1998-10-15

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