WO2015079002A1 - Appareil d'injection à canaux chauffés et procédé d'injection latérale avec goupilles de soupape indépendantes - Google Patents

Appareil d'injection à canaux chauffés et procédé d'injection latérale avec goupilles de soupape indépendantes Download PDF

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Publication number
WO2015079002A1
WO2015079002A1 PCT/EP2014/075876 EP2014075876W WO2015079002A1 WO 2015079002 A1 WO2015079002 A1 WO 2015079002A1 EP 2014075876 W EP2014075876 W EP 2014075876W WO 2015079002 A1 WO2015079002 A1 WO 2015079002A1
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WO
WIPO (PCT)
Prior art keywords
hot runner
nozzle
runner nozzle
injection molding
valve pin
Prior art date
Application number
PCT/EP2014/075876
Other languages
English (en)
Inventor
Swen Spuller
Original Assignee
Otto Männer Innovation 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 Otto Männer Innovation GmbH filed Critical Otto Männer Innovation GmbH
Priority to DE112014005406.2T priority Critical patent/DE112014005406T5/de
Publication of WO2015079002A1 publication Critical patent/WO2015079002A1/fr

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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
    • B29C45/28—Closure devices therefor
    • B29C45/2806—Closure devices therefor consisting of needle valve systems
    • B29C45/281—Drive 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
    • B29C45/0025—Preventing defects on the moulded article, e.g. weld lines, shrinkage marks
    • 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
    • B29C45/2735—Sprue channels ; Runner channels or runner nozzles for non-coaxial gates, e.g. for edge gates
    • 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
    • B29C45/0025—Preventing defects on the moulded article, e.g. weld lines, shrinkage marks
    • B29C2045/0027—Gate or gate mark locations
    • 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
    • B29C45/0025—Preventing defects on the moulded article, e.g. weld lines, shrinkage marks
    • B29C2045/0032—Preventing defects on the moulded article, e.g. weld lines, shrinkage marks sequential injection from multiple gates, e.g. to avoid weld lines
    • 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
    • B29C45/2701—Details not specific to hot or cold runner channels
    • B29C45/2708—Gates
    • B29C2045/2716—The gate axis being perpendicular to main injection axis, e.g. injecting into side walls of a container
    • 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
    • B29C2045/279—Controlling the flow of material of two or more nozzles or gates to a single mould cavity
    • 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
    • B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
    • B29C2945/76—Measuring, controlling or regulating
    • B29C2945/76003—Measured parameter
    • 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
    • B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
    • B29C2945/76—Measuring, controlling or regulating
    • B29C2945/76003—Measured parameter
    • B29C2945/76153—Optical properties
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/753—Medical equipment; Accessories therefor
    • B29L2031/7544—Injection needles, syringes

Definitions

  • the present invention relates to an injection molding machine having a hot runner manifold, a mold plate, at least two separate mold cavities, at least one first hot runner nozzle and at least one second hot runner nozzle connected to the hot runner manifold and arranged such that each hot runner nozzle can individually and independently conduct melt to the at least two gate openings.
  • the invention in particular relates to side-gated hot runner injection molds, hot runner nozzles comprising valve pins and an injection molding process for hot runner injection molding using hot runner nozzles having side needle valves.
  • Hot runner injection molds using hot runner nozzles for side injection via valve pins (side-gated hot runner nozzles) and injecting methods using hot runner injection molds with side-gated hot runner nozzles are likewise known.
  • the following publications are cited as examples hereto: US 7,322,817 from inventor Hans-Peter Manner and US 7,470, 123 from Swen Spuller, WO 2010/127965 from Braun, US 7,658,606 from Klobucar, US 6,245,279 from Kalemba, US 7,658,605 from Fairy, US RE 41648 (E1 ) from Olaru as well as JP 7144347A and JP H 1 1277573.
  • the invention is thus based on the objective of controlling the melt flow through at least one of a plurality of hot runner nozzles with valve pins for side injection (side- gated hot runner nozzles) independently of the melt flow through other hot runner nozzles.
  • An injection molding machine comprising a hot runner manifold, at least one mold plate and at least one support insert is proposed to achieve this objective.
  • the injection molding machine further comprises at least one mold cavity comprising at least two gate openings and at least one first hot runner nozzle and at least one second hot runner nozzle which are connected to the hot runner manifold and arranged such that each hot runner nozzle can individually and independently conduct melt to one of the at least two gate openings, wherein each hot runner nozzle in particular including a single nozzle tip and a nozzle meit channel through which melt is conducted towards and through the nozzle tip, is arranged in a support insert such that their nozzle tip is positioned with regard to the respective gate opening.
  • the injection molding machine further comprises at least one first needle valve assembly associated with the first hot runner nozzle and at least one second needle valve assembly associated with the second hot runner nozzle, whereby each of the needle valve assemblies comprises a valve pin displaceable along a first axis and an actuating element displaceable along a second axis, wherein the first axis is disposed at an angle with respect to the second axis and wherein the actuating element and the valve pin cooperate so as to control the amount of melt able to be conducted through the nozzle tip and through the respective gate opening into a mold cavity.
  • the inventive injection molding machine additionally comprises at least one first actuating device and at least one second actuating device associated with the needle valve assemblies, whereby the first actuating device comprises a first drive mechanism connected to the actuating element of the first hot runner nozzle and the second actuating device comprises a second drive mechanism connected to the actuating element of the second hot runner nozzle.
  • the drive mechanism comprises a pneumatic cylinder.
  • Such a pneumatic cylinder may comprise a position regulator function for adapting the stroke of the valve pin.
  • the drive mechanism comprises an electric drive for driving the valve pin as well as for the function of regulating the position of the valve pin.
  • the invention thereby discloses a hot runner injection device for side gating or injecting which makes use of a valve gate.
  • the injecting device comprises in particular a plurality of mold cavities, whereby each mold cavity has at least two gate openings.
  • at least one mold core extending along a mold core axis is disposed in the mold cavity.
  • melt is introduced into each mold cavity from at least two hot runner nozzles connected to a hot runner manifold. The at least two hot runner nozzles are then arranged such that they can separately and independently inject melt into each mold cavity through at least two gate openings.
  • three or four gate openings can also be arranged on a single mold cavity into which melt is introduced by three or four valve pin nozzles having side gates.
  • An exemplary injection molding machine comprises mold cavities of the same size, shape or volume. It is however also conceivable for the injection molding machine to comprise mold cavities having differing sizes, shapes or volumes.
  • the melt flows from the hot runner manifold to the at least one mold cavity through one or more hot runner nozzles, whereby each nozzle comprises at least one nozzle tip arranged in proximity to one gate opening of a mold cavity having in particular a plurality of gate openings.
  • valve pin is arranged external of a main melt channel disposed inside the nozzle body of the nozzle.
  • valve pin is of integral design and displaceable in a direction of movement along the main melt channel of the nozzle.
  • the valve pin of each nozzle has two sections: a first valve pin section (main valve pin section) which is connected to a drive mechanism and interacts with a second valve pin section arranged in proximity to the nozzle tip and near the gate opening.
  • One development of the injection molding machine comprises at least two separate mold cavities.
  • the injection molding machine comprises at least one controller device that is in particular operated automatically or manually which is connected to the at least one first and the at least one second actuating device and has at least one position regulator function for adjusting the position of the valve pin of the at least one first hot runner nozzle independently of or simultaneously with the position of the valve pin of the at least one second hot runner nozzle so as to guide melt into at least one mold cavity, in particular as to allow and to prevent guided melt access into at least one mold cavity via one nozzle while it prevents guided melt access into at least one other mold cavity via the other nozzle.
  • the controller device adjusts the position of the valve pin of the at least one first hot runner nozzle and/or the position of the valve pin of the at least one second hot runner nozzle so as to guide melt into at least one mold cavity through respectively both of the at least one first and at least one second hot runner nozzle.
  • the controller device adjusts the position of the valve pin of the at least one first hot runner nozzle and/or the position of the valve pin of the at least one second hot runner nozzle such that melt is guided into at least one mold cavity only through respectively one of the at least one first and at least one second hot runner nozzle.
  • the controller device is connected to the at least one first and the at least one second actuating device and has at least one position regulator function for adjusting the position of the valve pin of the at least one first hot runner nozzle independently of or simultaneously with the position of the valve pin of the at least one second hot runner nozzle so as to interrupt the feed of melt into at least one mold cavity.
  • One exemplary embodiment comprises such a controller device controlling in particular each of the three above-cited states and thereby the feed of melt into at least one mold cavity by means of at least two or at least one hot runner nozzle.
  • the feed of melt into at least one of the exemplary plurality of mold cavities can also be interrupted.
  • valve pin in the hot runner nozzle having a valve gate, to reduce and/or adjust or regulate or also interrupt the feed of melt into an individual mold cavity through at least two side gate openings and through in particular two valve gate nozzles with side injection by actuating a first hot runner nozzle with valve gate and thereby associated first valve pin opposite the first gate opening differently than a second hot runner nozzle with valve gate and thereby associated second valve pin such that positions of the first valve pin and the second valve pin can be selected for different filling processes for the same mold cavity or for different filling processes for filling the same mold cavity or for filling a plurality of mold cavities via at least two hot runner nozzles for each mold cavity.
  • the opening of the valve gates and thereby the flow velocity of the melt from the nozzles is adjustable such, that core shifting or other effects caused by the flow velocity of melt through an injection nozzle can be adapted. In so doing, it is possible to take at least one of the at least two hot runner nozzles out of operation when at least two side-gated hot runner nozzles are used to fill a mold cavity.
  • the gate opening is thereby blocked and the mold cavity filled via side injection by the remaining at least one other hot runner nozzle. This can be necessary should one of a plurality of hot runner nozzles be damaged and the quality of the injected molded part produced thus drop. It can likewise be necessary to block all the hot runner nozzles involved in filling a mold cavity in an injection mold having a plurality of mold cavities and continue the injection molding process only using the other mold cavities.
  • the filling of the mold cavities filled by two or more hot runner nozzles finishes sooner than the filling of the mold cavities filled by a fewer number of hot runner nozzles.
  • this can be dependent on the share of mold cavities to be filled with a fewer number of hot runner nozzles leading to a greater yield than completely stopping the filling of said mold cavities.
  • the position adjustment of the controller device can be preset, particularly by programming.
  • the position adjustment of the controller device is automatically calculated and adjusted based on parameter values fed to the controller device.
  • its position adjustment can be manually preset and/or manually adjustable, particularly during the operation of the injection molding machine.
  • the at least two mold cavities have the same or different volumes and can thereby have the same or different shapes.
  • a further aspect of the invention is a method of injection molding using an injection molding machine of the type as illustrated above wherein by means of a position regulator function the position of the valve pin of the at least one first hot runner nozzle is adjusted independently of or simultaneously with the position of the valve pin of the at least one second hot runner nozzle such that all of the at least two valve pins open and close the respective gate openings of a cavity.
  • a position regulator function the position of the valve pin of the at least one first hot runner nozzle is adjusted independently of or simultaneously with the position of the valve pin of the at least one second hot runner nozzle such that all of the at least two valve pins open and close the respective gate openings of a cavity.
  • At least one gate opening of a cavity is blocked by the respective valve pin and the at least one other valve pin still opens and closes the at least one other gate opening. This can be necessary should one of a plurality of hot runner nozzles be damaged and the quality of the injected molded part produced thus drop. If the number of hot runner nozzles used to fill a mold cavity is reduced, a longer injecting period is required to fill the mold cavity via the remaining hot runner nozzles.
  • molds having a plurality of mold cavities and at least one mold cavity is to be filled by the fewer remaining hot runner nozzles after one hot runner nozzle has been blocked
  • the filling of the mold cavities filled by two or more hot runner nozzles finishes sooner than the filling of the mold cavities filled by a fewer number of hot runner nozzles.
  • this can be dependent on the share of mold cavities to be filled with a fewer number of hot runner nozzles leading to a greater yield than completely stopping the filling of said mold cavities.
  • the controller device provides signals to the actuating devices during each injection cycle to either a) open and close all the gate openings of a cavity at the same time, or b) open and close the gate openings of a cavity at different times or
  • controller device serves for controlling the individual actuating devices and thus the individual valve pin of a nozzle.
  • the signals provided by the controller device are based on the molding processing data.
  • Suitable processing data is recorded by sensors within the injection molding machine and fed into the controller device. Applicable sensors are thermocouples in particular positioned near or within the melt channel of the hot runner system (manifold and nozzle) or the cavity, pressure sensors positioned within the cavity and further sensors that monitor the operation of the injection molding system. The sensors may be positioned at various locations in the injection molding system and therefore provide different information to the operation conditions.
  • Suitable processing data is also recorded by the controller device itself for example by feedback from the machine units as for example the pressure of the melt to be injected or the necessary time for the valve pin actuation or the duration of an injection molding cycle.
  • the signals provided by the controller device can be based on the quality of each molded part tracked from each mold cavity and from each gate opening.
  • the quality of the molded part, in particular weld marks or the completeness of the part is an indicator of a proper operation of the injection system.
  • the signals provided by the controller device can be based on a command of an operator which was entered into a controller of the injection molding machine and provided to the controller device. For example, if an operator recognizes any need to block one or more valve pins, he can enter this need in a respective controller of the injection molding machine and prevent the flow of melt through one or more single nozzles and/ or the flow of melt in one or more cavities while other cavities are in use.
  • each valve pin for example there is only one valve pin to be actuated in one nozzle - the filling process of a cavity with at least two gate openings can be controlled individually. Thereby it is possible to adjust the filling process for parts having difficile designs.
  • Fig. 1 a sectional view of a detail of an exemplary injection molding machine in the area of the injection mold;
  • Fig. 2 a magnified detail of the Fig. 1 representation
  • Fig. 3 a further magnified detail of the Fig. 1 or Fig. 2 representation
  • FIG. 4 another magnified detail of the Fig. 1 representation
  • Fig. 5 a different magnified detail of the Fig. 1 representation in the area of the actuating device
  • Fig. 6 a sectional view of a larger detail of an exemplary injection molding machine in the area of the injecting device
  • Fig. 7 a magnified detail of an exemplary injection molding machine in the area of the injecting device, similar to Fig. 4;
  • Fig. 8 a sectional view of a detail of a further exemplary injection molding machine in the area of the injecting mold.
  • Fig. 1 shows a detail of an exemplary injection molding machine in the area of the injection molding according to an exemplary embodiment of the invention.
  • the actuating device 40 which in the exemplary embodiment comprises a first pneumatic cylinder 41 and a second pneumatic cylinder 42 is shown in the upper area of the figure.
  • the injection molding machine comprises a hot runner manifold 30 and a manifold plate 31 .
  • a first hot runner nozzle 21 and a second hot runner nozzle 22 are arranged in the area of the manifold plate 31 as well as in a support insert 32.
  • the first hot runner nozzle 21 and the second hot runner nozzle 22 each comprise a first heating device 23 and a second heating device 24 as well as a first nozzle head 25 and a second nozzle head 26.
  • Hot runner nozzles 21 and 22 are hot runner nozzles with valve gates and side injection (side-gated hot runner nozzles).
  • the representation also shows the mold core 36 disposed in the mold cavity 35.
  • Fig. 2 shows a magnified detail of the Fig. 1 representation of an exemplary injection molding machine in the area of the injection mold. The detail is from the approximate area of that as circled in Fig. 1 .
  • Fig. 2 shows the mold core 36, which end section, depicted at the top of the figure, and which mold core head 36a are mounted in the nozzle-side cavity insert 37.
  • the cooling tube 38 is arranged inside the mold core 36, by means of which coolant, in particular water, circulates through the interior of the mold core 36.
  • nozzle heads 25 and 26 of hot runner nozzles 21 and 22 are positioned in the nozzle-side cavity insert 37.
  • a first support plate 25a and a second support plate 26a are in each case arranged at the end of the nozzle head opposite the nozzle tip and axially support the nozzle head relative the support insert 32.
  • Fig. 3 shows a further magnified detail of the Fig. 1 or Fig. 2 representation of an exemplary injection molding machine in the area of the injection mold. The detail is from the approximate area of that as circled in Fig. 2.
  • the representation shows the first nozzle tip 61 and the second nozzle tip 62 having a first key surface 61 a and a second key surface 62a arranged thereon.
  • the key surfaces enable the nozzle tips 61 , 62 to be mountable to the respective hot runner nozzle 21 , 22.
  • the first valve pin 63 and the second valve pin 64 are displaceably disposed within the first nozzle tip 61 and the second nozzle tip 62.
  • Fig. 3 shows the valve pins 63, 64 in a closed position of the hot runner nozzles with side injection 21 , 22.
  • the first gate opening 65 and the second gate opening 66 are in each case depicted in front of the respective valve pin 63, 64.
  • a first insulating ring 28 is arranged on the first nozzle head 25 which on the one hand thermally insulates the heated hot runner nozzle 12 from the cooled cavity insert 37.
  • the insulating ring 28 furthermore exhibits a sealing function relative to the cavity insert 37 such that the melt cannot penetrate into the cavity insert 37 along the nozzle head during the injection process.
  • the insulating ring 28 also serves in radially positioning the nozzle tip 61 in the cavity insert 37 and, as a result, the positioning relative to the gate opening 66.
  • a second insulating ring 29 having the same properties as the first insulating ring 28 is arranged on the second nozzle head 26.
  • Fig. 4 shows a likewise enlarged detail of the Fig. 1 representation, wherein shown in particular are the first nozzle head 25 and the second nozzle head 26 of the first and second side-gated hot runner nozzle 21 , 22, likewise in section.
  • the following description relates to the sectional view of first hot runner nozzle 21 , which is a mirror image of the second hot runner nozzle 22 depiction.
  • the valve pin 63 is arranged displaceable along a first axis 63a inside the hot runner nozzle 21 .
  • An actuating element 67 is likewise arranged displaceable along a second axis 67a arranged perpendicular to the first axis 63a such that a movement of the actuating element 67 along the second axis 67a produces a movement of the valve pin 63 along the first axis 63a.
  • the arrangement of the valve pin 63 and the actuating element 67 is referred to as the needle valve assembly 71 .
  • a coupling element 69 which is part of the actuating element 67 provides the moving mechanism for the needle valve assembly 71 .
  • a melt channel 27 is arranged inside the nozzle head 25 through which melt can be conducted from the hot runner manifold 30 to the first nozzle tip 62.
  • Fig. 5 shows a different magnified detail of the Fig. 1 representation in the area of the actuating device 40.
  • same comprises a first pneumatic cylinder 41 and a second pneumatic cylinder 42.
  • the first pneumatic cylinder 41 comprises a first actuating piston 43
  • the second pneumatic cylinder 42 comprises a second actuating piston 44, each respectively connected to the first actuating element 67 and the second actuating element 68 and serving to activate the hot runner nozzles with side injection 21 , 22.
  • Fig. 6 shows a sectional representation of a larger detail of an exemplary injection molding machine in the area of the injecting device. This representation depicts two mold cavities 35 into which melt can be injected in each case by two hot runner nozzles with side injection 21 , 22.
  • Fig. 6 further shows a controller device 80 connected to the actuating devices 41 , 42 of the needle valve assemblies 71 , 72, particularly to control the movement of the valve pins 63, 64.
  • the figures show one embodiment of a hot runner nozzle developed for side injection with side gates 21 , 22.
  • the valve pins 63, 64 in this case do not move in the opening / closing direction of the mold but rather at a right angle thereto.
  • the nozzle body including the pneumatics is situated toward the mold.
  • a pneumatically displaced actuating element simultaneously activates the valve pins 63, 64 disposed perpendicular thereto.
  • Hot runner nozzles 21 , 22 furthermore have a greater valve pin opening stroke to enlarge the flow cross section in the hot runner nozzle and thereby reduce pressure loss, thus enabling the manufacture of parts with greater weight and/or volume.
  • the hot runner nozzle with side gates 21 , 22 is sectioned into a plurality of structural parts configured with differently insulating/conductive materials. In conjunction with additional active heating and control zones both for each nozzle tip 61 , 62 as well as optionally for the nozzle flange, an optimum temperature profile is achieved over the entire melt flow path.
  • two mold cavity 35 gate openings 65, 66 are provided on the respective long sides of the mold part in the exemplary embodiment depicted. A twofold hot runner with two 1 -point nozzles is thereby used. Doing so thus shortens the melt flow paths and improves the filling of the mold cavity 35 when producing larger tubular bodies.
  • Injecting at the longitudinal sides means that the exemplary syringe bodies are removed at a 90° angle with respect to the valve pins 63, 64.
  • the pin is inserted into the mold part by just a few hundredths of a millimeter. So that the valve pin will not mar the surface of the syringe body upon removal, the pin undergoes a defined short return stroke prior to the opening of the mold.
  • the shut-off needle is thereby always situated in the gate hole so as to prevent uncontrolled leaking of the melt. Due to the return stroke movement, the valve pin tip frictionally heated during the injection process is no longer in contact with the mold part. This thereby achieves improved cooling of the gating on the mold part and thus a flawless surface even when no active cooling can be introduced into this area due to limited spatial conditions.
  • the mold shown in the figures comprises a modular two-cavity form and a fourfold hot runner system having four 1 -point nozzles.
  • Interchangeable mold inserts enable the manufacture of differently sized molded parts. Larger syringe bodies can be injected molded with in each case two gates, smaller bodies with just one.
  • Fig. 7 shows a magnified detail of an exemplary injection molding machine in the area of the injecting device, similar to Fig. 4, wherein shown in particular are a first nozzle head 25 of the first and side-gated hot runner nozzle 21 in section.
  • the function of the injecting device of Fig. 7 is according to the function of the injecting device of Fig. 4, which is described above.
  • Temperature sensors 48a, 48b are mounted in the injecting device of Fig. 7.
  • One temperature sensor 48a is arranged near to the gate opening 65 and a further temperature sensor 48b is arranged near to the nozzle tip 62.
  • the signals of one or both of the temperature sensors 48a, 48b are for example provided to the controller device 80 or, if applicable, are processed in a further controller and the output is provided to the controller device 80 for further processing and, if applicable, for providing signals to the respective actuating device to actuate or block the valve pin 63 of the hot runner nozzle 21 .
  • Fig. 8 shows a sectional view of a detail of a further exemplary injection molding machine in the area of the injecting mold.
  • a sensor device 49 is shown which is arranged at the mold cavity.
  • the sensor device 49 determines both, temperature and pressure within the cavity.
  • the signals of the sensor device 49 are for example provided to the controller device 80 or, if applicable, are processed in a further controller and the output is provided to the controller device 80 for further processing and, if applicable, for providing signals to the respective actuating device to actuate or block the valve pin 63 of the hot runner nozzle 21 .

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

Abstract

La présente invention concerne une machine de moulage par injection présentant un manifold à canaux chauffés (30), une plaque de fond, au moins une cavité de moule (35) comprenant deux ouvertures des directrices (65, 66), au moins une première tuyère à canaux chauffés (21) et au moins une seconde tuyère à canaux chauffés (22) raccordées au manifold à canaux chauffés et disposées de façon à ce que chaque tuyère à canaux chauffés puissent individuellement et indépendamment conduire la coulée vers la ou les ouvertures des directrices, chacun des ensembles formant robinet à pointeau comprenant une goupille de soupape (63, 64) déplaçable le long d'un premier axe (63a, 64a) et un élément d'actionnement (67, 68) déplaçable le long d'un second axe (67a, 68a), le premier axe (63a, 64a) formant un angle avec le second axe (67a, 68a).
PCT/EP2014/075876 2013-11-27 2014-11-27 Appareil d'injection à canaux chauffés et procédé d'injection latérale avec goupilles de soupape indépendantes WO2015079002A1 (fr)

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DE112014005406.2T DE112014005406T5 (de) 2013-11-27 2014-11-27 Heißkanalspritzgießvorrichtung und Verfahren zum seitlichen Anspritzen mit unabhängigen Ventilnadeln

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EP13005524.7 2013-11-27
EP13005524 2013-11-27

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WO2015079002A1 true WO2015079002A1 (fr) 2015-06-04

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105437477A (zh) * 2015-12-07 2016-03-30 哈希斯热流道科技（苏州）有限公司 热流道注塑模具的浇口阀针装置
CN113696423A (zh) * 2021-08-26 2021-11-26 延锋海纳川汽车饰件系统有限公司 一种防漏胶的叠模热流道系统

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4793795A (en) * 1987-10-16 1988-12-27 Mold-Masters Limited Injection molding system having clamped rotatable nozzles and method
JPH0999456A (ja) * 1995-10-06 1997-04-15 Sony Corp 射出成形装置
EP1291148A1 (fr) * 2001-09-07 2003-03-12 Mold-Masters Limited Mécanisme de commande de l'aiguille d'obturation dans une presse à injecter
EP2047961A1 (fr) * 2007-10-12 2009-04-15 Mold-Masters (2007) Limited Détection de position d'actionneur de buse à obturateur à aiguille de moulage par injection

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4793795A (en) * 1987-10-16 1988-12-27 Mold-Masters Limited Injection molding system having clamped rotatable nozzles and method
JPH0999456A (ja) * 1995-10-06 1997-04-15 Sony Corp 射出成形装置
EP1291148A1 (fr) * 2001-09-07 2003-03-12 Mold-Masters Limited Mécanisme de commande de l'aiguille d'obturation dans une presse à injecter
EP2047961A1 (fr) * 2007-10-12 2009-04-15 Mold-Masters (2007) Limited Détection de position d'actionneur de buse à obturateur à aiguille de moulage par injection

Non-Patent Citations (1)

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Title
SPINA R ED - ALTINTAS Y ET AL: "Injection moulding of automotive components: comparison between hot runner systems for a case study", JOURNAL OF MATERIALS PROCESSING TECHNOLOGY, ELSEVIER, NL, vol. 155-156, 30 November 2004 (2004-11-30), pages 1497 - 1504, XP004661050, ISSN: 0924-0136, DOI: 10.1016/J.JMATPROTEC.2004.04.359 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105437477A (zh) * 2015-12-07 2016-03-30 哈希斯热流道科技（苏州）有限公司 热流道注塑模具的浇口阀针装置
CN113696423A (zh) * 2021-08-26 2021-11-26 延锋海纳川汽车饰件系统有限公司 一种防漏胶的叠模热流道系统

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