WO2004062880A1 - Dispositif pour distribuer de la matiere plastique en fusion dans un moule de coulage par injection avec plusieurs etages - Google Patents

Dispositif pour distribuer de la matiere plastique en fusion dans un moule de coulage par injection avec plusieurs etages Download PDF

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Publication number
WO2004062880A1
WO2004062880A1 PCT/EP2004/000259 EP2004000259W WO2004062880A1 WO 2004062880 A1 WO2004062880 A1 WO 2004062880A1 EP 2004000259 W EP2004000259 W EP 2004000259W WO 2004062880 A1 WO2004062880 A1 WO 2004062880A1
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WO
WIPO (PCT)
Prior art keywords
valve rod
distribution device
channel
segments
plastic melt
Prior art date
Application number
PCT/EP2004/000259
Other languages
German (de)
English (en)
Inventor
Rainer Armbruster
Original Assignee
Foboha Gmbh Formenbau
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 Foboha Gmbh Formenbau filed Critical Foboha Gmbh Formenbau
Priority to EP04702291A priority Critical patent/EP1587659A1/fr
Publication of WO2004062880A1 publication Critical patent/WO2004062880A1/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
    • B29C45/32—Moulds having several axially spaced mould cavities, i.e. for making several separated articles
    • B29C45/322—Runner systems for distributing the moulding material to the stacked mould cavities
    • 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

Definitions

  • the invention is in the field of devices for distributing plastic melt in an injection mold with several levels according to the preamble of the independent claims.
  • No. 5,846,472 shows a device for distributing plastic melt in a tier shape with three levels.
  • melt is introduced into a middle block, which is arranged between a first and a second level with cavities.
  • This center block has a transversely arranged channel which is connected to externally arranged distribution channels.
  • Plastic melt is distributed through these distribution channels in cavities which are arranged on the three levels.
  • the distribution channels cross two of the three closing levels of the mold. In the area of these closing levels, the distribution channels are detachably connected via a valve system, so that the mold can be opened along the closing levels.
  • the distribution channels are sealed by means of valves.
  • the pressure in the main channel or in the channels connected via valves is reduced when the mold is opened in order to avoid any leakage.
  • This device is only suitable for molds with three closing levels. In principle, more than three closing levels are not possible, and the flow paths are asymmetrical.
  • US Pat. No. 5,910,327 shows a device for distributing plastic melt in a tier shape with more than four closing levels.
  • the device has two displaceable center blocks, in each of which a chamber for distributing plastic melt is arranged.
  • the two chambers are supplied individually with plastic melt by means of telescopically extendable feed channels.
  • the device is designed in such a way that no additional valves are necessary.
  • the problem is that, when the mold is moved together, the telescopically extendable Main channels contained plastic melt, can not escape.
  • pressure in the channel system is problematic, particularly due to the telescopic design of the main channel.
  • the functional structure of this device depends on the number of levels of the mold.
  • a hot runner system with a segmented main channel is provided, which is used for direct or indirect distribution of the plastic melt to one or more levels of the tier shape.
  • the main channel preferably consists of several segments which can be separated from one another and which can be operatively connected to one another via valves when the tier shape is closed.
  • the valves are preferably centered. ral controlled. If necessary, the valves are designed so that they are sealed regardless of the operating pressure.
  • the distribution device preferably has a structure with symmetrical flow paths.
  • One embodiment of the device has a segmented main channel with a multi-part valve rod arranged inside.
  • the valve rod is arranged to be displaceable in the longitudinal direction, that is to say in the direction of the main channel, and serves to control the melt flow, or rather to control valves which are arranged in the region of connection points of the individual segments of the main channel.
  • the individual segments of the valve rod are surrounded by sleeves (guide bushes).
  • all valves are arranged essentially in the same direction.
  • the sleeves in the area of the valves serve, on the one hand, to support the valve rod and, on the other hand, in active combination with assigned flow areas (thin points) of the valve rod, to control the flow of the plastic melt.
  • the melt flow through the valves is controlled by moving the valve rod lengthways.
  • the distances between the flow ranges, e.g. Thin points of the valve rod essentially correspond to the distances between the valves or the separation points of the segments of the main channel.
  • each segment of the main channel has a sleeve at both ends which tightly surrounds the valve rod in this area.
  • the valve rod has one or more thin points, which can be displaced into the region of the separation points by a longitudinal displacement of the valve rod, so that a flow opening is opened.
  • the main channel has a curved or kinked configuration if necessary to avoid obstacles.
  • the valve rod has corresponding deflections or kinks.
  • the main channel has a connection for an injection device, by means of which plastic melt is introduced into the mold or the main channel.
  • an actuator which actively or passively controls and / or reports the position of the valve rod.
  • the position of the valve rod or the valves is preferably regulated by internal or external manipulated variables. Alternatively or in addition, the position of the valve rod is determined by the operating pressure of the injection process.
  • actuating cylinders, mechanical Beat or spring elements are provided, which are used at least to control the end positions.
  • a preferred embodiment has, at least on one segment, an actuator which is arranged laterally essentially at a right angle to the valve rod and which serves to control the end positions or to lock the valve rod in its closed position.
  • a hydraulic actuating cylinder is used as the actuator, for example, which is operatively connected to a bolt which, in the closed position, engages in a groove in the valve rod provided for this purpose and is suitable for locking the valve rod in its closed position.
  • the bolt and the groove serve as a securing element and are preferably designed so that the valves can be opened when the mold is closed by means of the closing pressure.
  • the actuating cylinder can be arranged outside the mold if necessary.
  • the actuating cylinders are preferably arranged at one end of the valve rod.
  • a valve rod that can be displaced in the longitudinal direction
  • a valve rod that can be activated by rotation about the longitudinal axis.
  • the principle of the invention enables a direct or indirect distribution of the plastic melt, preferably via symmetrical flow paths in storey shapes with any number of storeys.
  • the flow paths are formed by segmented channels that can be operatively connected via valves. Secondary channels can have the same functional structure as the main channel.
  • Valve rods are activated by appropriately arranged actuators or actuating cylinders.
  • the at least one main channel, or secondary channel is usually actively or passively heated.
  • the heating serves to keep the plastic melt of the main duct at operating temperature.
  • the heating is designed in such a way that the melt enclosed in the individual segments of the main duct does not solidify when the tier shape is opened.
  • Appropriate thermal conductivity measures are planned.
  • the main duct is, if necessary, at least partially insulated from the tier shape. If necessary, the individual segments of the main channel have compensating means which prevent melt from escaping when the segments of the main channel are separated.
  • the compensating means serve to control the pressure in the segments of the main channel, in particular when and after opening / closing the valves.
  • the compensating means are preferably means which bring about pressure and / or volume compensation.
  • Equalization valves, expansion vessels or other pressure-equalizing or pressure-controlling means are suitable.
  • Valve rods with a variable length are particularly suitable, for example in that they are designed in several parts. Spring elements can be arranged between the individual parts of the valve rod. If necessary, the valves or channel segments are designed in such a way that they are designed to be sealed even when there is high pressure in the open state. This is caused, for example, by valves of appropriate length or by the temperature control (viscosity) in the area of the valves.
  • the invention relates to a distribution device for distributing plastic melt in a tier shape.
  • the distribution device has a segmented main channel with at least two channel segments which, when the injection mold is closed, can be operatively connected via a separating point in between.
  • a preferably segmented valve rod serves to regulate the flow of plastic melt through a valve arranged in the region of the separation point.
  • the valve rod can be designed in one piece. It has a length that allows the mold to be opened.
  • a preferred embodiment of the distribution device has an outer channel segment with a connection for a plasticizing unit, an inner channel segment, which serves to distribute plastic melt via distribution channels in cavities, and at least one middle channel segment arranged between the inner and the outer, which is used to guide the plastic melt serves from the outer to the inner channel segment.
  • the segments of the valve rod are operatively connected to one another when the injection mold is closed.
  • the distribution device is preferably designed in such a way that the valves seal at least one channel segment in a sealing manner regardless of the pressure in the adjacent channel segment. If necessary, the distribution device has at least one means for equalizing the pressure in the main channel.
  • Figure 1 shows a device for distributing plastic melt in a plan view
  • Figure 2 shows a main channel in a perspective view
  • Figure 3 shows the main channel of Figure 2 in the open position
  • Figure 4 shows the main channel of Figure 3 in the open position
  • Figure 5 shows a further embodiment of a main channel in a sectional view
  • FIG. 6 shows a third embodiment of a main duct with three actuators arranged on the side
  • Figure 7 shows the main channel of Figure 6 in the closed position in a plan view and in a sectional view from the side;
  • Figure 8 shows the main channel of Figure 6 in the open position in a plan view and in a sectional view from the side.
  • Figure 1 shows a first embodiment of a device for distributing plastic melt, henceforth distribution device 1, in a tier shape 2 with four closing levels 3.1, 3.2, 3.3, 3.4 (separation levels).
  • Plastic melt is passed through a centrally arranged, segmented main channel 4 with three segments 4.1, 4.2, 4.3 into a central block 5 and from there through distribution channels 18 (not all visible) into individual cavities 6.
  • the main channel 4 here consists of three channel segments 4.1, 4.2, 4.3 which are operatively connected to one another via valves 7.
  • the main channel 4, or the channel segments 4, 1, 4.2, 4.3, have a cavity 24 on the inside, which is used to pass material melt from one valve to the next, or to channels leading away.
  • the cavity is divided into segments by the valves 7.
  • a likewise segmented valve rod 8 is arranged centrally in the region of the cavities 24 and has 7 separation points 10 in the region of the valves, along which it can be separated when the tier shape 2 is opened.
  • the valve rod 8 In the region of the valves 7, the valve rod 8 is in guide bushings 9 mounted, the cross section of which it fills in the closed position.
  • the guide bushes 9 also have separating points and extend on both sides of the separating points 10.
  • the valve rod 8 is arranged so as to be displaceable in the longitudinal direction of the main channel 4 when the tier shape 2 is closed and has in the area of the valve 7 or the separation points 8 assigned thin points 1 1. By moving the valve rod 8 in its longitudinal direction, the thin points 11 are placed in the valves 7 in such a way that a flow of synthetic melt through the valves 7 is possible
  • the main channel 4 has an outer channel segment 4.3, which has a connection 12 for connecting a plasticizing unit (not shown in more detail).
  • a plasticizing unit (not shown in more detail).
  • In the central block 5 there is an inner channel segment 4.1, which is used to distribute the plastic melt via distribution channels or secondary channels 18 into individual channels Cavities.
  • the invention is not restricted to solutions with one or only one middle channel segment (4.2).
  • the invention relates to a distribution device (1) for distributing plastic melt in a tier shape (2).
  • the distribution device (1) has a segmented main channel (4), the segments (4.1, 4.2, 4.3) of which can be operatively connected to one another in a sealing manner in the region of separation points (7).
  • the individual channel segments (4.1, 4.2, 4.3) have valves (10) which serve to seal the channel segments, in particular when the mold is opened.
  • FIG. 2 shows a distribution device 1 detached from a tier shape in a perspective sectional view.
  • the main channel 4 consists of three channel segments 4.1, 4.2, 4.3.
  • a valve rod 8 is arranged in the interior of the main duct 4, which also comprises three rod segments 8.1, 8.2, 8.3.
  • Rod segments 8.1, 8.2, 8.3 can be separated in the area of separation points 10.
  • the segments 4.1, 4.2, 4.3 of the main channel 4 have 10 valves 7 in the area of the separation points, which seal the segments 4.1, 4.2, 4.3 of the main channel 4 when the tier shape is opened.
  • the valve rod 8 is surrounded in a sealing manner by guide bushings 9 on each side of the separation points 10.
  • the rod segments 8.1, 8.2, 8.3 have thin points 11 which serve to regulate the flow of the plastic melt.
  • the thin points 11 in the area of the guide book brought 9 and cause that a flow opening 37 is formed so that plastic melt can pass.
  • the main channel 4 has at one end a connection 12 for a plasticizing device (not shown in more detail), which is used for injecting plastic melt.
  • the valve rod 8 has in this area a thickening 13 with a conical sealing surface 14 which cooperates sealingly with a counter surface 15 in the closed position. This is a main valve 17 which prevents plastic melt from escaping from the connection 12.
  • the main channel 4 has an adjusting device in the form of a steep cylinder 16.
  • the actuating cylinder 16 is operatively connected to the valve rod 8 and is used for positioning the valve rod 8, or for directly / indirectly opening and / or closing the valves 7.
  • the duct segments 4.1, 4.2, 4.3 of the main duct 4, or rather the rod segments 8.1, 8.2, 8.3 of the valve rod 8, are sealingly connected to one another by being pressed together.
  • An injection device (not shown in detail) is then sealingly connected to the connection 12.
  • the valve rod 8 is moved in the longitudinal direction X of the main channel 4.
  • the thin points 11 are moved into the region of the guide bushes 9 by this movement, as a result of which the valves 7 are opened.
  • the plastic melt thus reaches the rear end segment 4.1 of the main channel 4 and from there is passed on to secondary channels 18 in cavities (cf. FIG. 1).
  • valves 7 are closed as a result of the pressure reduction and / or by the actuating cylinder 16 by moving the valve rod in the opposite direction.
  • securing elements can be provided if necessary.
  • connection 12 or the valve rod 8 can be designed such that the valve rod is opened by connecting the injection unit (plasticizing unit) or by actuating an adjusting means arranged in the mouth area.
  • a suitable embodiment has inside the part of the injection device corresponding to the connection 12 in the interior of the part of the injection device corresponding to the connection 12 has a driven pin (not shown in more detail) which is used to drive the valve rod 8. The drive effect can also be achieved by pressing the mouth of the connection 12.
  • Detail view C shows the separation, respectively. the valves 7, 10 in an enlarged view.
  • the channel segments 4.1, 4.2, 4.3 and the rod segments 8.1, 8.2, 8.3 are shown in operative connection.
  • the valve rod 8 fills the guide bush 9 in a sealing manner, so that the valve point 7 is closed and the plastic melt present in the interior channel segment 4.1, 4.2, 4.3 cannot escape.
  • Figure 3 shows the main channel 4 of Figure 2 in the open position.
  • the valve rod 8 is displaced in the longitudinal direction X of the channel to such an extent that the thin points 11 (cf. detail D) in the region of the separating points 10 or the valves 7 are arranged and so the valves are open.
  • the flow of the plastic melt is illustrated schematically by means of arrows FI, F2, F3.
  • the main duct 4 is surrounded by heating or insulation means 19, which are used for temperature and temperature control in the interior of the duct segments 4.1, 4.2, 4.3.
  • the valve rod 8 is fully or partially heated if necessary.
  • the valve rod 8 is preferably made of a good heat-conducting material.
  • Figure 4 shows the main duct 4 of Figure 2 in the open position, i.e. with open tier shape.
  • the segments of the main channel are separated along the separation points 10, so that the channel segments 4.1, 4.2, 4.3, respectively.
  • the rod segments 8.1, 8.2, 8.3 are not in operative connection with one another.
  • the rod segments 8.1, 8.2, 8.3 of the valve rod 8 fill the guide bushes 8 in a sealing manner, so that the valves 7 are tightly sealed (see detailed illustration E).
  • heating elements 20 are arranged inside the channel segments 4.1, 4.2, 4.3, which are in thermal connection with the rod segments 8.1, 8.2, 8.3.
  • the heating elements 20 are used for direct and indirect heating of the plastic located in the corresponding channel segment 4.1, 4.2, 4.3.
  • the heating elements 20 have a shape similar to that of a bed. They are arranged essentially radially and in streams. direction oriented ribs 21 held.
  • support ribs 22 serve for guiding and thermally coupling the rod segments 8.1, 8.2, 8.3 with the active means.
  • FIG. 5 shows a further embodiment of a channel segment 25 of a main channel 4 in a sectional view.
  • the channel segment 25 is designed such that it is suitable for pressure compensation when the main channel is opened.
  • the channel segment 25 is configured here in two parts.
  • the first and the second rod segment 25.1, 25.2 are connected to one another via a spring element.
  • the valves 7 are first closed by bringing the valve rod into the closed position. If the plastic melt in the interior of the channel segment 25 is still under high pressure, this pressure is reduced by the two rod segments 26.1, 26.2 drifting apart in the direction of the arrow G1.
  • the two rod segments 26.1, 26.2 are in abutment, so that they transmit forces in the longitudinal direction of the rod.
  • the longer rod segment 26.2 is heated directly by means of a heating element 20.
  • the heating element 20 is supported by means of ribs 21. In the area of the valves 7, respectively.
  • the thin point 11 is provided with additional support ribs 22 which serve to guide the valve rod 8.
  • FIG. 6 shows a further embodiment of a distribution device 1 for distributing plastic melt by means of a main channel 4 in a perspective view.
  • the main channel 4 has an inner, a middle and an outer channel segment 4.1, 4.2, 4.3, which can be operatively connected to one another via a first and a second separation point 10.1, 10.2.
  • Each of the channel segments 4.1, 4.2, 4.3 is by a heating, respectively.
  • Isolation element 19 surrounds and has a securing element 23 arranged essentially perpendicular to the longitudinal direction X of the channel, which serves to control and secure the position of the valve rod arranged in the interior of the main channel 4 (cf. FIGS. 7 and 8).
  • the main channel 4 has a connection opening 12 which serves to connect a plasticizing unit (not shown in more detail).
  • the inner channel segment has two secondary channels 18 (only shown in sections) which are used to distribute the melt.
  • the inner channel segment has at its rear end an actuating cylinder 16 which serves to control and adjust the axial position of the valve rod (see FIGS. 7 and 8).
  • Figure 7 a shows the main channel 4 of Figure 6 in a plan view.
  • the section along the section plane DD is shown in Figure 7 b).
  • the main channel 4, or the channel segments 4.1, 4.2, 4.3, have a cavity 24 inside, which extends essentially over the entire length of the main channel 4 and is used to pass material melt from one valve 7 to the next, or to channels leading away.
  • the cavity 24 is divided into segments by the divisible valves 7.
  • the distribution device 1 is shown in the closed position of the injection mold 2 (see FIG. 1), i.e. the individual channel segments 4.1, 4.2, 4.3 of the main channel 4 are operatively connected to one another.
  • the three channel segments 4.1, 4.2, 4.3 are operatively connected to one another via the valves 7 or the separation points 10.
  • the segmented valve rod 8 is shown in the open position, its thin points 11 are located in the region of the guide bushes 9, so that the flow openings 37 form a connection between the segments 24.1, 24.2, 24.3 of the cavity 24. Plastic melt can thus be pressed from one channel segment 4.1, 4.2, 4.3 into the next.
  • each of the channel segments 4.1, 4.2, 4.3 has a securing element arranged essentially perpendicular to the longitudinal direction X of the channel 23 on.
  • the securing element 23 has a hydraulic cylinder 33 with a housing 28, in which a hydraulically operated working piston 29 (alternative suitable drive means are possible), which is operatively connected to a bolt 30.
  • the segments 8.1, 8.2, 8.3 of the valve rod 8 each have a thickening 31 with a groove 32.
  • the groove 32 is arranged such that the bolt 30 can engage in the groove 32 when the valves 7 are closed (cf. FIG. 8b) and thus secures the valve rod 8 against displacement in the longitudinal direction X.
  • the bolt 30 In the open position shown, ie when the flow openings 37 are free, the bolt 30 is arranged above the thickening 31 and the valve rod 8 can be moved in the direction of the longitudinal axis X. If necessary, the valve rod 8 is additionally supported in the area of the latch 30 in order to absorb lateral forces of the latch 30.
  • valve rod 8 With the hydraulic actuating cylinder 16, which can also be arranged at a certain distance from the main channel 4, the valve rod 8 is brought into the closed position, so that the valves 7 and the connection 12 are securely closed when the mold is open.
  • the individual segments 8.1, 8.2, 8.3 of the valve rod are secured in this position by means of the securing elements 23.
  • Figure 8 a) shows the main channel 4 in a top view in the open position, i.e. in the position in which the multi-storey injection mold 2 (cf. FIG. 1) has moved apart along its parting planes 3.3, 3.4.
  • Figure 8 b) shows a sectional view of the main channel 4 along the sectional plane EE.
  • the segments 8.1, 8.2, 8.3 of the valve rod 8 are arranged such that the valves 7 are closed and plastic melt (not shown in more detail) remains in the cavity 24 in the interior of the main channel 4 of the distribution device 1.
  • the valves 7 and separation points 10 are constructed in such a way that small amounts of escaping plastic melt have no negative influence on the mode of operation.
  • the individual segments 8.1, 8.2, 8.3 of the valve rod 8 are secured by the bolts 30 of the securing elements 23, which engage in this position in the circumferential grooves 32 of the valve rod 8. In that a closing pressure is applied to the hydraulic cylinders 33, the bolts 30 are locked in the grooves 32.
  • both the bolt 30 and the groove 32 have a face, so that the active and counter surfaces of the bolt 30 and the groove 32 are arranged at an angle ⁇ to the longitudinal direction X. Depending on the size of the angle ⁇ , the self-locking or the force that is required to move the valve rod 8 in the longitudinal direction can be set.
  • passive fuse elements can also be used instead of active fuse elements as used in the embodiment shown.
  • an automatic snap device with an elastically (resiliently) mounted and essentially perpendicular to the longitudinal direction X bolt which is arranged so that it engages in a groove when the valves 7 are closed and thus prevents displacement of the valve rod in the longitudinal direction X.
  • the valve rod is unlocked by moving the valve rod in the longitudinal direction with a certain force F (see detail M) so that the bolt is pressed out of the groove.
  • F see detail M
  • a securing element 23 is not absolutely necessary, in particular in the case of the inner channel segment 8.1 of the main channel 8, since the actuating cylinder 16 can also be used as a securing means. If required, alternatively or in addition, the valve rod 8 or its segments 8.1, 8.2, 8.3 can be designed such that locking by rotation about the longitudinal axis X is possible.

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

Abstract

L'invention concerne un dispositif de distribution (1) utilisé pour distribuer de la matière plastique en fusion dans un moule étagé (2). Ce dispositif de distribution (1) comporte un canal principal (4) segmenté dont les segments (4.1, 4.2, 4.3) peuvent être mis en liaison active, de façon étanche, l'un avec l'autre, dans la zone de phase de séparation (7). Les segments de canal (4.1, 4.2, 4.3) individuels comportent des soupapes (10) qui servent à les fermer de façon étanche, notamment lors de l'ouverture du moule.
PCT/EP2004/000259 2003-01-15 2004-01-15 Dispositif pour distribuer de la matiere plastique en fusion dans un moule de coulage par injection avec plusieurs etages WO2004062880A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP04702291A EP1587659A1 (fr) 2003-01-15 2004-01-15 Dispositif pour distribuer de la matiere plastique en fusion dans un moule de coulage par injection avec plusieurs etages

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH0054/03 2003-01-15
CH542003 2003-01-15

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WO2004062880A1 true WO2004062880A1 (fr) 2004-07-29

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007052869A1 (fr) * 2005-11-04 2007-05-10 Nam Wuk Heo Rallonge de buse pour le moulage de plastiques a compensation de la dilatation thermique
US7951322B2 (en) 2006-06-13 2011-05-31 Electroform Company Method and apparatus for molding and assembling plural-part plastic assemblies
US9327436B2 (en) 2012-12-20 2016-05-03 Mold-Masters (2007) Limited Stack mold transfer device
EP3969249A4 (fr) * 2019-05-17 2023-02-01 Canon Virginia, Inc. Procédé de fabrication, système de moulage par injection, et moule

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US6348171B1 (en) * 1999-05-11 2002-02-19 Mold Masters Limited Drool control apparatus and method

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Publication number Priority date Publication date Assignee Title
GB2039247A (en) * 1978-12-14 1980-08-06 Gellert J Injection moulding apparatus
JPS5851125A (ja) * 1981-09-22 1983-03-25 Mitsubishi Metal Corp 射出成形切離しホツトランナ用バルブ装置
US5460510A (en) * 1994-11-30 1995-10-24 Gellert; Jobst U. Valve gated stack injection molding apparatus
US6348171B1 (en) * 1999-05-11 2002-02-19 Mold Masters Limited Drool control apparatus and method

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007052869A1 (fr) * 2005-11-04 2007-05-10 Nam Wuk Heo Rallonge de buse pour le moulage de plastiques a compensation de la dilatation thermique
US7951322B2 (en) 2006-06-13 2011-05-31 Electroform Company Method and apparatus for molding and assembling plural-part plastic assemblies
US8113820B2 (en) 2006-06-13 2012-02-14 Electroform Company, Inc. Method and apparatus for molding and assembling plural-part plastic assemblies
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