WO2006024607A1 - Clapet antiretour pour machines de moulage par injection - Google Patents

Clapet antiretour pour machines de moulage par injection Download PDF

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Publication number
WO2006024607A1
WO2006024607A1 PCT/EP2005/054067 EP2005054067W WO2006024607A1 WO 2006024607 A1 WO2006024607 A1 WO 2006024607A1 EP 2005054067 W EP2005054067 W EP 2005054067W WO 2006024607 A1 WO2006024607 A1 WO 2006024607A1
Authority
WO
WIPO (PCT)
Prior art keywords
locking ring
slider
piece
end piece
ring
Prior art date
Application number
PCT/EP2005/054067
Other languages
German (de)
English (en)
Inventor
Martin Würtele
Original Assignee
Krauss-Maffei Kunststofftechnik 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 Krauss-Maffei Kunststofftechnik Gmbh filed Critical Krauss-Maffei Kunststofftechnik Gmbh
Publication of WO2006024607A1 publication Critical patent/WO2006024607A1/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
    • B29C45/47—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
    • 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
    • B29C45/02—Transfer moulding, i.e. transferring the required volume of moulding material by a plunger from a "shot" cavity into a mould cavity

Definitions

  • the invention relates to a non-return valve for injection molding machines according to the preamble of patent claim 1.
  • Such backflow stops are mounted on an ejection-side end of a plasticizing screw in an injection cylinder and serve as a "valve" to prevent plasticized plastic material from being forced back into the flight during an injection process.
  • a non-return valve according to the preamble of claim 1 is known from DE 198 36 871.
  • a locking ring is concentric with the center piece of a worm head between an open position in which he tangs with his front page to a stop surface on the back of the tail of the Seh ncke Nes, and a blocking position in which it rests against a thrust ring of the worm head , axially and circumferentially displaceable, ie during rotation of the screw, the locking ring is not necessarily carried by the screw head.
  • the distance that the locking ring is displaceable relative to the screw head is to be referred to below as stroke A.
  • the locking ring forms an annular gap together with the center piece and has holes for the material passage in the vicinity of the end face. In the open position of the locking ring is located with its front side on the stop surface on the back of the tail and plastic melt can flow through the holes and then past the tail of the screw head in the Schneckenvorraum.
  • the locking ring is in the aforementioned open position. Due to the forward movement of the screw, the plastic melt flows in the direction of the locking ring and moves it backwards to the worm. As a result, the locking ring is lifted from the stop surface on the tail. The stroke A is reduced to a smaller degree A '. As a result, the plastic melt can increasingly flow through the annular gap between the inner diameter of the locking ring and the outer diameter of the middle piece. Thus, shortly after the start of injection, an approximate pressure equalization occurs over the backflow barrier. Due to the pressure build-up in the antechamber as a result of the injection process, the plastic melt is pressed through the not yet closed backflow and the stroke of the locking ring is further reduced.
  • a backflow lock in which the locking ring has a plurality of melt lines in the form of holes that are not in communication with each other.
  • the locking ring is guided on a shoulder of the screw head, which is smaller than the screw head outer diameter, and taken in the tip, i. the locking ring rotates forcibly with a screw rotation with the main body of the backflow lock.
  • a disadvantage of this embodiment are the measures that must be taken to minimize the wear effect of the co-rotating Sperringes on the corresponding inner wall of the plasticizing, because this, the gap between these parts must be large enough. This is particularly important for large screw diameters.
  • the invention has the object, so to develop a return flow lock of ein ⁇ initially mentioned type that it has an improved closing behavior and low wear on the cylinder inner surface and a low material damage.
  • the solution of this object is achieved by a non-return valve with the features of claim 1; the following claims relate to advantageous developments of the invention.
  • the end piece has a recess in the region between the center piece and its stop surface, such that the end piece in this area has a slider with a diameter D GL on which the locking ring with its inside axially and circumferentially relative to the tail and slidably rests on the middle piece, wherein the slider has a length L which is greater than the stroke A of the locking ring and the locking ring is not necessarily carried by the main body of the backflow preventer (Seh tease head) in the circumferential direction.
  • This solution prevents plastic melt from flowing between the locking ring and the end piece into the annular gap. During the injection process, the pressure in front of the locking ring is thus kept constant or increased.
  • Fig. 2 is a longitudinal sectional view of the first variant in an intermediate position shortly after
  • FIG. 6 shows a longitudinal section of a fourth variant in the blocking position
  • FIG. 7 Top view of the non-return valve of FIG. 5 from the direction of the arrow in FIG. 5.
  • the remindströmsperre shown in Figures 1 to 3 comprises a screw head 10 with an ejection-side end piece 12, a cylindrical centerpiece 14 and a Montage ⁇ end 20 for mounting at one end of an injection screw, wherein the screw head 10 between its mounting end 20 and the center piece 14 a Pressure ring 16 carries.
  • Concentric to the center piece 14, a locking ring 18 is arranged and forms together with the center piece 14 an annular gap 22.
  • the outer diameter of the locking ring 18 is dimensioned so that the locking ring is just axially displaceable in a plasticizing cylinder, not shown here, on the one hand an open position (Figure 1) and a locking position ( Figure 3) to take, but on the other hand to allow almost no relative movement in the circumferential direction.
  • the locking ring 18 is axially displaceable with respect to the Seh tease head, in an open position (Fig. 1), in which a stop surface 30 of the end piece 12 with a head-bearing surface 28 of the locking ring 18 comes into contact, and in a locking position (Fig 3), in which a stop surface 24 of the pressure ring 16 comes into contact with a locking bearing surface 26 of the locking ring 18.
  • a flow of material passes the gap between the surfaces 24 and 26, the annular gap 22 and the bores 32.
  • the locking ring In the blocking position, the locking ring is in its right end position, and the gap between the surfaces 24, 26 is closed, so that no Material can be pressed in the direction of the screw.
  • the end piece 12 has on its back - so the locking ring side facing - a recess 40, such that a slider 42 is formed with a diameter D GL .
  • This slider 42 forms an over the entire circumference extending and continuous support surface on which the locking ring 18 is displaceable with its front end 46 both in the axial direction and in the circumferential direction.
  • the locking ring 18 is not taken by the worm head during its rotation.
  • the length L of the slider 42 is greater than or equal to the stroke A of the locking ring 18 between the open and the locked position. This ensures that plastic melt can only penetrate through the openings 32 into the annular gap 22 during injection (see FIGS. 2 and 3).
  • a part of the stop surface 28 can already be made available in the open position as an inflatable cross-sectional area.
  • Various embodiments of this are shown in Figures 4 to 6. It remains up to the expert to design further embodiments with an inflatable cross-sectional area.
  • the outer diameter D AE of the end piece 12 may be smaller than the outer diameter D AS of the locking ring 18 at its front end 46, so that a leading edge 54 is formed.
  • the end piece 12 may, for example, have at least one axial or angled channel 50, wherein the diameter D K of the end piece 12 in the region of the channel 50 at the channel bottom is the same (as shown in FIG. not shown here), or smaller (as shown in Figure 6) than the diameter D GL of the slider 42 may be.
  • the length U of the channel 50 is to be designed so that it ends in the region of the length L of the slider 42, so that a shoulder 52 remains, in which the locking ring 18 still rests tightly on the slider 42 and no plastic melt from the annular gap 22 in the channel 50 and vice versa can pass, but the plastic melt continues to flow exclusively through the openings 32.
  • FIG. 7 shows the top view of the embodiment according to FIG. 5 from the direction of the arrow in FIG. 5.
  • four channels 50 distributed over the circumference are provided in the end piece 12 and four openings 32 are distributed over the circumference in the locking ring 18.
  • the mounting end may also be integrally formed together with the pressure ring and the middle piece, in which case the tail is attached to the center piece, for example by screwing.

Landscapes

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

Abstract

L'invention concerne un clapet antiretour pour machine de moulage par injection, comportant une tête de vis sans fin (10), qui présente un embout (12), une pièce centrale (14), une bague de serrage (16) et une extrémité de montage (20), ainsi qu'une bague de blocage (18), qui est montée coaxialement à l'axe longitudinal de la pièce médiane (14) et forme conjointement avec elle, une fente annulaire (22). La bague de blocage (18) peut coulisser dans le sens axial entre une position de passage et une position de blocage, d'une levée A par rapport à la tête de vis sans fin (10) et dispose d'ouvertures (32) pour le passage de la matière plastique fondue. L'embout (12) présente un évidement (40) conçu de sorte qu'une pièce de glissement (42) de longueur L ≥ A soit formée, pièce sur laquelle la bague de blocage (18) repose par sa face intérieure (34), de manière à coulisser dans le sens axial et dans le sens périphérique. Lors de l'injection, la matière plastique fondue ne peut refluer que par les ouvertures (32). La surface de section transversale sur laquelle la matière plastique fondue peut affluer peut être augmentée, du fait qu'une arête d'afflux (54) est formée et/ou du fait qu'il est prévu un ou plusieurs canaux (50) dans l'embout (12).
PCT/EP2005/054067 2004-09-01 2005-08-18 Clapet antiretour pour machines de moulage par injection WO2006024607A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102004042615.5 2004-09-01
DE102004042615.5A DE102004042615B4 (de) 2004-09-01 2004-09-01 Rückströmsperre für Spritzgießmaschinen

Publications (1)

Publication Number Publication Date
WO2006024607A1 true WO2006024607A1 (fr) 2006-03-09

Family

ID=35116149

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2005/054067 WO2006024607A1 (fr) 2004-09-01 2005-08-18 Clapet antiretour pour machines de moulage par injection

Country Status (4)

Country Link
KR (1) KR20070048198A (fr)
CN (1) CN101022934A (fr)
DE (1) DE102004042615B4 (fr)
WO (1) WO2006024607A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT511617B1 (de) * 2011-09-09 2013-01-15 Engel Austria Gmbh Rückstromsperre für eine plastifizierschnecke einer spritzgiessmaschine
AT16962U1 (fr) * 2019-04-25 2021-01-15 Engel Austria Gmbh

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1124672B (de) * 1956-11-21 1962-03-01 Nothelfer & Soehne Werkzeug Un Schnecken-Spritzgussmaschine zur Verarbeitung thermoplastischer Kunststoffe
US20020063232A1 (en) * 2000-11-30 2002-05-30 Gatti Joeo M. Flow though ring valve for plastic extruding systems
DE10059615A1 (de) * 2000-12-01 2002-06-20 Battenfeld Gmbh Rückstromsperre
DE10309973A1 (de) * 2003-03-07 2004-09-23 Krauss-Maffei Kunststofftechnik Gmbh Rückströmsperre für Spritzgießmaschinen

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4204537A1 (de) * 1992-02-15 1993-08-19 Boy Gmbh Dr Schneckenanordnung fuer eine spritzgiessmaschine
DE19836871B4 (de) * 1997-08-19 2004-07-01 Krauss-Maffei Kunststofftechnik Gmbh Rückströmsperre
DE19959495C1 (de) * 1999-12-10 2001-05-23 Battenfeld Gmbh Rückstromsperre

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1124672B (de) * 1956-11-21 1962-03-01 Nothelfer & Soehne Werkzeug Un Schnecken-Spritzgussmaschine zur Verarbeitung thermoplastischer Kunststoffe
US20020063232A1 (en) * 2000-11-30 2002-05-30 Gatti Joeo M. Flow though ring valve for plastic extruding systems
DE10059615A1 (de) * 2000-12-01 2002-06-20 Battenfeld Gmbh Rückstromsperre
DE10309973A1 (de) * 2003-03-07 2004-09-23 Krauss-Maffei Kunststofftechnik Gmbh Rückströmsperre für Spritzgießmaschinen

Also Published As

Publication number Publication date
DE102004042615A1 (de) 2006-03-02
KR20070048198A (ko) 2007-05-08
DE102004042615B4 (de) 2014-06-05
CN101022934A (zh) 2007-08-22

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