WO2007141012A1 - Buse chauffée de moulage par injection - Google Patents

Buse chauffée de moulage par injection Download PDF

Info

Publication number
WO2007141012A1
WO2007141012A1 PCT/EP2007/005023 EP2007005023W WO2007141012A1 WO 2007141012 A1 WO2007141012 A1 WO 2007141012A1 EP 2007005023 W EP2007005023 W EP 2007005023W WO 2007141012 A1 WO2007141012 A1 WO 2007141012A1
Authority
WO
WIPO (PCT)
Prior art keywords
injection molding
heater
molding nozzle
material pipe
nozzle
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
PCT/EP2007/005023
Other languages
German (de)
English (en)
Inventor
Herbert Günther
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.)
Guenther Heisskanaltechnik GmbH
Original Assignee
Guenther Heisskanaltechnik 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 Guenther Heisskanaltechnik GmbH filed Critical Guenther Heisskanaltechnik GmbH
Publication of WO2007141012A1 publication Critical patent/WO2007141012A1/fr
Anticipated expiration legal-status Critical
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
    • 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
    • B29C45/26—Moulds
    • B29C45/27—Sprue channels ; Runner channels or runner nozzles
    • B29C45/2737—Heating or cooling means therefor
    • 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
    • B29C45/1782—Mounting or clamping means for heating elements or thermocouples
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B3/00—Ohmic-resistance heating
    • H05B3/40—Heating elements having the shape of rods or tubes
    • H05B3/42—Heating elements having the shape of rods or tubes non-flexible
    • 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
    • B29C45/26—Moulds
    • B29C45/27—Sprue channels ; Runner channels or runner nozzles
    • B29C45/2737—Heating or cooling means therefor
    • B29C2045/274—Thermocouples or heat sensors

Definitions

  • the invention relates to an injection molding nozzle for an injection molding tool according to the preamble of claim 1.
  • Injection molding nozzles are used in injection molding tools to supply a flowable material, such as a plastic melt, at a predeterminable temperature under high pressure to a separable mold insert. They usually have a material tube with a flow channel that ends in a nozzle orifice. The latter forms a nozzle outlet opening at the end, which opens via a gate in the mold insert (mold cavity). So that the flowable mass does not cool prematurely within the material tube, a heater is provided, which has to ensure a uniform as possible temperature distribution into the nozzle mouthpiece.
  • a flowable material such as a plastic melt
  • the heater can, as described for example in EP-AO 927 617, be formed in the form of a sleeve made of a good heat-conducting material, which is pushed onto the material tube and extends over almost the entire axial length of the material tube.
  • an electrical heating coil is formed in the wall of the sleeve coaxial with the flow channel, which emits heat energy through the sleeve to the material pipe.
  • the slopes of the individual turns of Schuleiterchtl can be selected differently according to need. The lower the slope, the higher the heat energy output to the corresponding axial material pipe section.
  • the heater can alternatively also as one of a heating medium, eg Water or oil, through-flow pipe piece be formed when, for example, an electric heater is not desired or not feasible.
  • temperature sensor which detect the actual temperature of the nozzle.
  • These are - as disclosed for example in EP-A-10 927 617 or DE-U-201 00 840 - introduced as separate elements in grooves or bores, which are provided in the nozzle body or in the heater.
  • the problem here is that even a slight change in position of the temperature sensor can lead to significant measurement errors, which adversely affects the reproducibility of the temperatures.
  • the injection molding nozzle comprises a material pipe in which at least one flow channel for a flowable material is formed, and a heater for the flowable material, which is arranged in the axial direction relative to the material pipe in a predetermined position.
  • the injection molding nozzle further comprises at least one clamping means which maintains this axial position of the heater relative to the material pipe during operation of the injection molding, ie a relative movement between the heater and the material pipe in the axial direction due to temperature-induced different component dimensions or the like prevented. In this way, it is ensured that the thermal energy fed in via the heater into the individual axial material pipe sections does not unintentionally vary during operation of the injection molding nozzle.
  • a heater is used, which is sleeve-like arranged around an outer circumference of the material tube in order to heat this evenly.
  • the heater can be, for example, a sleeve of a good heat-conducting material, such as copper or brass, which extends over almost the entire axial length of the material tube and in the wall coaxial with the flow channel an electric heating coil or a heating medium fürströmbahre Pipe is formed.
  • the material pipe and the heater are preferably enclosed by a housing in order to achieve a good thermal separation between the injection molding nozzle and the cold tool.
  • the tensioning means is arranged between the material pipe and the heater, wherein the heater finds a stop on the housing enclosing the material pipe.
  • the clamping means between the housing and the heater is arranged so that it finds a stop on the material pipe.
  • the at least one tensioning means is preferably a spring, in particular an annular spring, which pretensions the heating in the axial direction of the injection molding nozzle.
  • the clamping device is supported, for example, against a region of the material pipe on the one hand and against a region of the heater on the other hand, wherein the clamping means presses the heater against a stop which positions the heater and the material tube in the axial direction relative to each other.
  • the injection molding nozzle furthermore preferably has at least one temperature sensor which detects an actual temperature within the injection molding nozzle for the purpose of temperature control.
  • the temperature sensor is advantageously fixed to the heater in the end region of the material tube, so that the position of the temperature sensor remains constant relative to the material tube during operation of the injection molding due to the clamping means.
  • injection molding nozzle is intended for use in an injection molding, which is used for the production of molded parts from a flowable material - for example, a plastic melt.
  • the injection molding apparatus usually has a platen (not shown) and, in parallel thereto, a distributor plate (also not shown) in which a system of flow channels is formed. These open into a plurality of injection molding nozzles 10, which are designed, for example, as hot runner nozzles and are each mounted with a housing 12 on the underside of the distributor plate.
  • the injection molding nozzle 10 comprises a material pipe 14, which is provided at its upper end with a flange-like connection head 16. This sits releasably in the housing 12. A radially formed step 18 centers the housing 12 and thus the injection molding in the injection molding.
  • a flow channel 20 for the plastic melt is centrally introduced.
  • the preferably designed as a bore flow passage 20 has in the connection head 16, a material supply port 22 and opens at its lower end in a nozzle orifice 24, which is formed for example as a nozzle tip.
  • the latter has a material outlet opening 26, so that the flowable molten material can get into a mold cavity, not shown.
  • the preferably made of high heat conductive material nozzle tip 24 is inserted into the end of the material tube 14, preferably screwed. But it can also - depending on the application - axially displaceably mounted for the same operation or formed integrally with the material tube 14.
  • a sealing ring 28 is provided in the connection head 16 of the material pipe 14 concentrically with the material feed opening 22. It is also conceivable to form an additional annular centering approach, which can facilitate the installation of the injection molding nozzle 10 on the injection molding.
  • a heater 32 is placed on the outer circumference 30 of the material tube 14. This is aisge noted by a sleeve 34 made of a good heat conducting material, such as copper or brass, which extends over almost the entire axial length of the material tube 14. Within the sleeve 34 is coaxial with the flow channel 20, not shown in the drawing electrical Schuleiterhausl formed whose not shown connections are led out laterally from the housing 12. The entire heater 32 is enclosed by a protective tube 36.
  • the housing 12 is continued in the direction of the nozzle tip 42 by a shaft arrangement 44.
  • This has a shank main part 46 made of hardened tool steel, a cap-shaped separator 48 made of poorly heat-conducting material and also made of hardened tool steel, annular shaft end portion 50.
  • the latter forms a receptacle 52 having a substantially cylindrical inner contour, which the free end 40th the material tube 14 in the sliding seat sealingly, while the shaft main part 46 and the separator 48 surround the material tube 14 at a radial distance, so that except for a narrow stop point 54 of the heater 32 on the separator 48, a thermally insulating air gap 56 between the heater 32 and the shaft assembly 44 remains.
  • a tensioning means 62 is provided between the upper free end of the sleeve 34 of the heater 32 and a radial shoulder 60 of the material pipe 14 opposite the free end, for example in the form of an annular spring. The latter pushes the sleeve 34 permanently against the abutment point 54 of the main shaft portion 46 of the shaft assembly 44.
  • the heater 32 is held in the axial direction A in an always fixed position relative to the material tube 14, regardless of whether the material of the sleeve 34 and that of the material tube 14 at the prevailing operating temperatures evenly expand or not.
  • An impairment of the heat energy transfer from the heater 32 to the individual axial material pipe sections during operation of the injection molding 10 due to an axial positional shift between the material pipe 14 and heater 32 is therefore excluded.
  • the crimp barrel that the position of the temperature sensor 38 relative to the material pipe 14 in the axial direction A and thus the location of the temperature measurement does not change. This ensures proper functioning of a temperature control device (not shown) based on the actual temperatures detected by the temperature sensor 38.
  • the clamping means 62 between the housing 12, 44 and the heater 32 is arranged.
  • preferably designed as a spring element clamping means 62 is supported on the cap-shaped separating part 48 of the shaft assembly 44 and presses the heater 32 permanently against a (unspecified) stop point on the material pipe 14.
  • Also characterized during operation of the injection molding 10 is always a precise axial positioning the heater 32 ensured on the material pipe 14, so that an always defined and constant heat energy is supplied.
  • an injection molding nozzle 10 for an injection molding tool has a material pipe 14 in which at least one flow channel 20 is formed for a flowable material.
  • a heater 32 for the flowable material On the material pipe 14 is seated a heater 32 for the flowable material, wherein the material pipe 14 and the heater 32 are enclosed by a housing 12, 44.
  • the heater 32 is arranged in the axial direction A relative to the material pipe 14 in a predetermined position, wherein at least to maintain this predetermined position a tensioning means 62 is used, which is arranged between the material pipe 14 and the heater 32 or between the housing 12, 44 and the heater 32.

Landscapes

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

Abstract

Buse de moulage par injection (10) destinée à un outil de moulage par injection comprenant un tube de matière (14), dans lequel est réalisé au moins un canal d'écoulement (20) pour une matière coulante, et un chauffage (32) pour la matière coulante, le tube de matière (14) et le chauffage (32) étant entourés par un boîtier (12, 44). L'objectif de l'invention est d'éviter, pendant le service de la buse de moulage par injection 10, une altération de la transmission d'énergie calorifique depuis le chauffage (32) au tube de matière (14). À cet effet, le chauffage (32) est disposé dans le sens axial (A) par rapport au tube de matière (14) dans une position prédéfinie, au moins un moyen de serrage (62) étant utilisé pour conserver cette position prédéfinie, ledit moyen de serrage étant agencé entre le tube de matière (14) et le chauffage (32) ou entre le boîtier (12, 44) et le chauffage (32).
PCT/EP2007/005023 2006-06-07 2007-06-06 Buse chauffée de moulage par injection Ceased WO2007141012A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200620009056 DE202006009056U1 (de) 2006-06-07 2006-06-07 Beheizte Spritzgießdüse
DE202006009056.8 2006-06-07

Publications (1)

Publication Number Publication Date
WO2007141012A1 true WO2007141012A1 (fr) 2007-12-13

Family

ID=36915332

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2007/005023 Ceased WO2007141012A1 (fr) 2006-06-07 2007-06-06 Buse chauffée de moulage par injection

Country Status (3)

Country Link
DE (1) DE202006009056U1 (fr)
TW (1) TW200824886A (fr)
WO (1) WO2007141012A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202006015282U1 (de) * 2006-10-04 2008-02-14 Günther Heisskanaltechnik Gmbh Spritzgiessdüse
DE202006018576U1 (de) * 2006-12-06 2008-04-17 Günther Heisskanaltechnik Gmbh Heisskanaldüse mit Temperaturfühler
DE102007011461A1 (de) * 2007-03-07 2008-09-11 Breyer Gmbh Maschinenfabrik Extrusionsdüse zur Herstellung von Hohlkammerprofilen

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4404894C1 (de) * 1994-02-16 1995-01-05 Dangelmaier Sfr Formbau Beheizte Düse zur Zuführung einer Kunststoffschmelze in die Formhöhlung eines Kunststoff-Spritzgießwerkzeuges
EP0927617A1 (fr) * 1997-12-19 1999-07-07 Günther Heisskanaltechnik GmbH Buse à canal chaud
EP1386717A1 (fr) * 2002-08-02 2004-02-04 Mold-Masters Limited Elément chauffant fileté amovible pour une buse d'un canal chaud
WO2005102656A1 (fr) * 2004-04-20 2005-11-03 Piero Enrietti Unite buse chauffee pour le moulage de materiaux plastiques

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4404894C1 (de) * 1994-02-16 1995-01-05 Dangelmaier Sfr Formbau Beheizte Düse zur Zuführung einer Kunststoffschmelze in die Formhöhlung eines Kunststoff-Spritzgießwerkzeuges
EP0927617A1 (fr) * 1997-12-19 1999-07-07 Günther Heisskanaltechnik GmbH Buse à canal chaud
EP1386717A1 (fr) * 2002-08-02 2004-02-04 Mold-Masters Limited Elément chauffant fileté amovible pour une buse d'un canal chaud
WO2005102656A1 (fr) * 2004-04-20 2005-11-03 Piero Enrietti Unite buse chauffee pour le moulage de materiaux plastiques

Also Published As

Publication number Publication date
TW200824886A (en) 2008-06-16
DE202006009056U1 (de) 2006-08-10

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