WO2002074517A1 - Verschliessbarer düsenkörper sowie verfahren zum verschluss desselben - Google Patents
Verschliessbarer düsenkörper sowie verfahren zum verschluss desselben Download PDFInfo
- Publication number
- WO2002074517A1 WO2002074517A1 PCT/EP2002/002945 EP0202945W WO02074517A1 WO 2002074517 A1 WO2002074517 A1 WO 2002074517A1 EP 0202945 W EP0202945 W EP 0202945W WO 02074517 A1 WO02074517 A1 WO 02074517A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- nozzle body
- pressure
- nozzle
- pressure element
- closure element
- 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
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
- B29C45/57—Exerting after-pressure on the moulding material
-
- 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
- B29C45/20—Injection nozzles
Definitions
- the invention relates to a closable nozzle body according to the preamble of claim 1 and a method for closing the same according to the preamble of claim 18.
- a generic nozzle body for an injection molding machine for processing plastics and other plasticizable materials such as powdery or ceramic materials which has a cyclically usable closure element.
- the plasticized material is alternately injected into two mold cavities, the closure element exposing the sprue to one mold cavity when it closes the other.
- a pressure cylinder unit is assigned to each of the sprue channels, so that as soon as the closure element closes the one sprue channel, the pressure cylinder unit can influence the pressure at the associated mold cavity, while new material is already being injected into the other mold cavity.
- the time advantage gained is based on the fact that two mold cavities are alternately are used, so that this device can not be transferred to a compact nozzle unit, which may only serve one mold cavity.
- closure nozzles are e.g. known from EP 0 322 497 A2. Closure takes place only after the end of the holding pressure phase, which is necessary to maintain a high-quality molding without sink marks or cavities. Especially with thick-walled molded parts, however, a long holding time is required, which contributes directly to increasing the cycle time.
- the present invention is based on the tasks of creating a nozzle body and of making available a method which, with a compact structure, allows a separation between the metering process and the holding pressure process.
- a holding pressure space is provided in the nozzle body, which can be influenced by a pressure element actuated in the nozzle body by a further actuating element.
- dosing can take place at the same time before the closure element, regardless of the application of the holding pressure.
- this long holding pressure time can already be used again for dosing, so that the cycle time is significantly reduced.
- the separation in the nozzle body is essential for the invention, so that from the outside controlled in the nozzle, the pressure can be influenced, preferably controlled, even if this option is not used.
- a separation of reprint and material pressure is possible.
- the separation of the dosing space and the hold pressure space in the nozzle body also means that the material to be dosed can be dosed over a longer period of time and thus possibly more slowly. This means that a smaller torque acts on the screw, so that the material is subjected to less shear forces. This ensures gentler handling of sensitive materials.
- the holding pressure is no longer dependent on the nozzle contact force. At the same time, the tightness of the nozzle system is increased.
- the actuating member engages a pressure element which is floatingly supported in the nozzle channel.
- Fig. 1 is a side view of one arranged on a machine base
- FIG. 2 shows an enlarged section through the nozzle body according to FIG. 1
- FIG. 3 shows a representation according to FIG. 2 towards the end of the mold filling phase
- 4 shows a representation according to FIG. 2 at the beginning of the holding pressure phase
- FIG. 5 shows an illustration according to FIG. 2 at the end of the holding pressure phase
- FIG. 8 shows a representation according to FIG. 2 in a further embodiment
- FIG. 10 shows a section along line 10-10 in FIG. 9.
- the injection molding unit S shows an injection molding unit S arranged on a machine base 36 of an injection molding machine for processing plastics and other plasticizable materials such as powdery or ceramic materials.
- the injection molding unit has a plasticizing cylinder 30, at the front end of which a nozzle body 10 is arranged. Rings 20, 21, which are actuated by actuators 40, 41, are arranged on the nozzle body as actuation elements for parts arranged in the interior of the nozzle body. Instead of the rings, other elements can also be provided, provided that only a reliable introduction of force into the parts arranged within the nozzle body 10 is possible.
- the injection molding unit S plasticizes the material and injects it via the nozzle body 10 into a mold cavity of an injection mold 25. At least a part of the mostly multi-part injection mold 25 is fastened to the stationary mold carrier 35 which, according to FIG. 1, is penetrated by the nozzle body 10 in a passage opening.
- the nozzle body 10, 10 ' has a nozzle opening 11 for injecting the plasticized material into the injection mold 25.
- a nozzle channel 12, 12' opens into the nozzle opening 11 and is connected at the other end to a plasticizing cylinder 30 in which a conveyor 31, here a screw conveyor, conveys the plasticized material in the direction of the nozzle opening 11.
- a closure element 13, 13 ' is provided for closing the nozzle channel 12, 12' as required, which is actuated by an actuating member 40. In the closed position, the closure element 13, 13 ′ separates a space that is at least temporarily open to the injection mold 25. This space can be influenced by a further actuator 41, 41 ', which is assigned to the nozzle body 10, 10'.
- the closure element 13, 13 'thus separates, in the closed position in the nozzle body 10, 10', a space designed as a holding space 14 from a metering space 15 which is connected to the conveying element 31 of the plasticizing cylinder 30.
- the internal pressure and / or the volume of the holding space 14 can be influenced independently of the metering taking place on the other side of the closure element and can be controlled or regulated in the exemplary embodiment by means of a pressure element 16, 16 '.
- the pressure element is preferably arranged coaxially with an injection axis s-s in the nozzle body 10, 10 'which passes through the nozzle opening 11.
- the pressure element 16 is arranged in the nozzle channel 12 and can be moved there to a limited extent.
- FIGS. 2 and 7 show that the ring 21 actuated by the actuating member 41 is in operative connection with an actuating element 51 with the pressure element 16 arranged in the nozzle channel 12. The maximum movement is limited by an elongated hole.
- the pressure element 16 has a piston 17, which acts on the pressure chamber 14 and is guided in the closure element 13 in this exemplary embodiment.
- the pressure element 16 is mounted in a floating manner in the nozzle channel 12, so that it can be operated reliably even when material is already being conveyed and metered behind the closure element 13.
- the pressure element 16 has flow channels 16a for the passage of plasticized material, which in the exemplary embodiment are delimited by the wall of the nozzle channel 12.
- the flow channels can also be arranged such that they come to rest completely in the pressure element and that there is no contact with the wall of the nozzle channel 12.
- the closure element 13 is arranged downstream of the pressure element 16 in the flow direction of the plasticized material, but its piston 17 is parallel to the pressure element 16.
- the closure element 13 is likewise arranged in the nozzle channel and has passage channels 13a for the passage of plasticized material up to the pressure chamber 14.
- These passage channels 13a which are present in the open position according to FIG. 6, are closed by an axial movement of the closing element 13 on the wall of the nozzle channel 12, preferably on the end face on the nozzle head 18.
- this embodiment has the advantage that a relatively large sealing surface is created with a short closure path
- the device works as follows: 2 shows a state at the beginning of the filling phase.
- the funding 31 is still in the withdrawn state in Figure 2 on the right.
- the pressure element 16 is still moved forward after the end of the last cycle, while the closure element is moved to the right into its open position. If the conveying means 31 now moves to the left in FIG. 2, material is first conveyed into the injection mold 25 via the throughflow channels 16a and also the through channels 13a.
- FIG. 3 Towards the end of the filling phase, a representation according to FIG. 3 is obtained.
- the pressure element 16 has been pulled back or pushed to the right, so that a holding space 14 is formed in front of the piston 17 of the pressure element 16.
- the closure element 13 is still in the open position.
- the movement of the pressure element 16 and the piston 17 firmly connected thereto does not lead to a change in volume when the closure element 13 is open, but only to a volume shift. Due to the floating bearing in the nozzle channel, the forces in front of and behind the pressure element are canceled out.
- the pressure conditions around the pressure element remain unchanged, so that the pressure element has no influence on the process control.
- closure element 13 is also shaped such that the same forces act in front of and behind the closure element in the open position.
- the movement of pressure element 16 with piston 17 and also the movement of the closure element are therefore above all without influence on the molded part.
- the pressure element 16 although it is located in the nozzle channel 12, can move freely as a floating element.
- the pressure can still be applied out of the pressure chamber 14 by actuating the pressure element by means of ring 21 and actuating element 51.
- the movement of the pressure element does not lead to a change in volume, but only to a volume shift, so that metering can nevertheless be carried out evenly behind the closure element.
- simultaneous dosing and repressing is possible, so that the normally e.g. in the case of PET preforms, the long holding pressure time which is decisive for the cycle can already be used for dosing the next cycle.
- the resulting separation between dosing and holding pressure is made possible by the externally controlled elements in the nozzle body 10.
- the pressure element 16 ' is also arranged in the nozzle body 10', but in a loading area separate from the nozzle channel 12. rich.
- the pressure element 16 ' is no longer guided in the closure element but in the nozzle body 10'.
- Only a rotary lock is provided as the closure element 13 ', which is arranged in the rear part of the nozzle body and cyclically closes and releases the nozzle channel 12'.
- Other closure options are also conceivable here, provided that the nozzle channel is separated into two areas only in the nozzle body 10 '.
- nozzle channel 12 ' Starting from the nozzle channel 12 ', it branches in the central region into passage openings 19, which in turn then open out into the holding space 14, although in the closed position the passage openings 19 and the nozzle channel 12' remaining downstream of the closing element 13 'at the same pressure as that Nachdruckraum 14 are exposed.
- a holding pressure space 14 is formed in front of the piston 17 of the pressure element 16 ', which can be influenced by the pressure element 16' independently of the metering taking place behind the closure element.
- the closure element 13 ' closes the nozzle channel 12' and is arranged in the flow direction of the plasticizable material in front of the pressure element 16 '.
- a space in the nozzle body 10, 10 ' is cyclically separated in both cases and this space is influenced by means of a further actuating member 41, 41'.
- the holding chamber 14 and the dosing chamber 15 form, so that the holding chamber 14 can be controlled or regulated during the holding phase, while at the same time the dosing of the next cycle can begin behind the closure element.
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
- Absorbent Articles And Supports Therefor (AREA)
Abstract
Description
Claims
Priority Applications (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA002442928A CA2442928A1 (en) | 2001-03-20 | 2002-03-16 | Closable nozzle body and method for closing the same |
| EP02735135A EP1372932B1 (de) | 2001-03-20 | 2002-03-16 | Verschliessbarer düsenkörper sowie verfahren zum verschluss desselben |
| AT02735135T ATE280668T1 (de) | 2001-03-20 | 2002-03-16 | Verschliessbarer düsenkörper sowie verfahren zum verschluss desselben |
| US10/471,503 US7040887B2 (en) | 2001-03-20 | 2002-03-16 | Closable nozzle body |
| DE50201406T DE50201406D1 (de) | 2001-03-20 | 2002-03-16 | Verschliessbarer düsenkörper sowie verfahren zum verschluss desselben |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE10113352.9 | 2001-03-20 | ||
| DE10113352A DE10113352B4 (de) | 2001-03-20 | 2001-03-20 | Verschließbarer Düsenkörper sowie Verfahren zum Verschluss desselben |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2002074517A1 true WO2002074517A1 (de) | 2002-09-26 |
Family
ID=7678132
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/EP2002/002945 Ceased WO2002074517A1 (de) | 2001-03-20 | 2002-03-16 | Verschliessbarer düsenkörper sowie verfahren zum verschluss desselben |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US7040887B2 (de) |
| EP (1) | EP1372932B1 (de) |
| AT (1) | ATE280668T1 (de) |
| CA (1) | CA2442928A1 (de) |
| DE (2) | DE10113352B4 (de) |
| WO (1) | WO2002074517A1 (de) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1554934A1 (de) * | 1966-06-18 | 1970-01-22 | Schloemann Ag | Spritzgiessmaschine zur Verarbeitung plastizierbarer oder schmelzbarer Werkstoffe,insbesondere Kunststoffe |
| DE1729391A1 (de) * | 1967-07-08 | 1971-10-07 | Wotan Werke Gmbh | Spritzgiessmaschine mit drehbarer und verschiebbarer Schnecke |
| JPS5567434A (en) * | 1978-11-15 | 1980-05-21 | Toshiba Mach Co Ltd | Constant pressure controlling device |
| JPH02169219A (ja) * | 1988-12-23 | 1990-06-29 | Denson Kk | 射出成形用遮断弁 |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB976369A (en) * | 1962-07-30 | 1964-11-25 | Shell Int Research | Manufacture of articles from thermoplastic polymeric materials |
| US3295169A (en) * | 1963-12-23 | 1967-01-03 | Ernest P Moslo | Spring-pressed shutoff for injection nozzle |
| DE3018381A1 (de) * | 1980-05-14 | 1981-11-19 | Bayer Ag, 5090 Leverkusen | Einspritzduese fuer mischkoepfe zur herstellung von schaumstoff oder massivstoff bildenden reaktionsgemischen aus mindestens zwei fliessfaehigen komponenten |
| DE3744519A1 (de) * | 1987-12-30 | 1989-07-13 | Karl Hehl | Plastifizierzylinder fuer eine kunststoff-spritzgiesseinheit |
-
2001
- 2001-03-20 DE DE10113352A patent/DE10113352B4/de not_active Expired - Fee Related
-
2002
- 2002-03-16 EP EP02735135A patent/EP1372932B1/de not_active Expired - Lifetime
- 2002-03-16 WO PCT/EP2002/002945 patent/WO2002074517A1/de not_active Ceased
- 2002-03-16 AT AT02735135T patent/ATE280668T1/de not_active IP Right Cessation
- 2002-03-16 CA CA002442928A patent/CA2442928A1/en not_active Abandoned
- 2002-03-16 DE DE50201406T patent/DE50201406D1/de not_active Expired - Fee Related
- 2002-03-16 US US10/471,503 patent/US7040887B2/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1554934A1 (de) * | 1966-06-18 | 1970-01-22 | Schloemann Ag | Spritzgiessmaschine zur Verarbeitung plastizierbarer oder schmelzbarer Werkstoffe,insbesondere Kunststoffe |
| DE1729391A1 (de) * | 1967-07-08 | 1971-10-07 | Wotan Werke Gmbh | Spritzgiessmaschine mit drehbarer und verschiebbarer Schnecke |
| JPS5567434A (en) * | 1978-11-15 | 1980-05-21 | Toshiba Mach Co Ltd | Constant pressure controlling device |
| JPH02169219A (ja) * | 1988-12-23 | 1990-06-29 | Denson Kk | 射出成形用遮断弁 |
Non-Patent Citations (2)
| Title |
|---|
| PATENT ABSTRACTS OF JAPAN vol. 004, no. 108 (M - 024) 5 August 1980 (1980-08-05) * |
| PATENT ABSTRACTS OF JAPAN vol. 014, no. 428 (M - 1025) 14 September 1990 (1990-09-14) * |
Also Published As
| Publication number | Publication date |
|---|---|
| CA2442928A1 (en) | 2002-09-26 |
| EP1372932A1 (de) | 2004-01-02 |
| ATE280668T1 (de) | 2004-11-15 |
| DE10113352A1 (de) | 2002-10-02 |
| US20040076709A1 (en) | 2004-04-22 |
| DE50201406D1 (de) | 2004-12-02 |
| US7040887B2 (en) | 2006-05-09 |
| DE10113352B4 (de) | 2005-03-03 |
| EP1372932B1 (de) | 2004-10-27 |
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