DE1014315B - Sealing nozzles for injection molding machines for processing thermoplastics - Google Patents
Sealing nozzles for injection molding machines for processing thermoplasticsInfo
- Publication number
- DE1014315B DE1014315B DEB33120A DEB0033120A DE1014315B DE 1014315 B DE1014315 B DE 1014315B DE B33120 A DEB33120 A DE B33120A DE B0033120 A DEB0033120 A DE B0033120A DE 1014315 B DE1014315 B DE 1014315B
- Authority
- DE
- Germany
- Prior art keywords
- nozzle
- mass
- injection molding
- molding machines
- bolt
- 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.)
- Pending
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
- B29C45/20—Injection nozzles
- B29C45/23—Feed stopping equipment
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Description
Verschlußdüsen für Spritzgußmaschinen zur Verarbeitung thermoplastischer Kunststoffe Zur Verhinderung des Austretens von Masse aus der Düsenmündung nach Trennung der Einspritzdüse von der Form (nach heendetem Spritzvorgang) wurden schon verschiedene Verschlußkonstruktionen vorgeschlagen. Entweder arbeiten diese mit einem von außen im Rhythmus des Arbeitstaktes der Maschine gesteuerten Verschlußorgan (Schieber, Ventil), oder eine Feder bewirkt bei Beginn der Rückzugbewegung des Spritzkolbens selbsttätig den Verschluß, beispielsweise in der Art eines Nadelventils. Es ist auch eine Anordnung bekannt, bei welcher eine zylindrisch im Masseraum befindliche Feder den längs beweglich ausgebildeten Düsenkopf belastet. Innerhalb des Kopfes sind vom Düsenkanal ausgehende Querbohrungen vorhanden, welche durch die Mantelfläche des Zylinders, in welchem der Düsenkopf gleitet, in vorderer Lage (Sperrlage nach Trennung der Form von der Düse) abgedeckt sind, während sie beim Aufsetzen der Düse auf die Form durch die Längsverschiebung des Düsenkopfes gegen die Feder die Verbindung zwischen Düsenkanal und Masseraum des Heizzylinders herstellen.Closure nozzles for injection molding machines for processing thermoplastics Plastics To prevent mass from escaping from the nozzle mouth Separation of the injection nozzle from the mold (after the end of the injection process) has already been achieved various closure constructions proposed. They either work with you a locking device controlled from the outside in the rhythm of the machine's work cycle (Slide, valve), or a spring causes the injection piston to retract at the beginning of the retraction movement automatically the closure, for example in the manner of a needle valve. It is an arrangement is also known in which a cylinder is located in the mass space Spring loaded the longitudinally movable nozzle head. Inside the head there are transverse bores extending from the nozzle channel, which penetrate the outer surface of the cylinder in which the nozzle head slides in the front position (locking position after Separation of the mold from the nozzle) are covered while placing the nozzle on on the shape by the longitudinal displacement of the nozzle head against the spring the connection Establish between the nozzle channel and the mass space of the heating cylinder.
Die zwangläufige Anordnung der Feder in einem Bereich relativ hoher Temperatur und meist noch innerhalb der zähflüssigen Masse verursachen aber eine beträchtliche Störanfälligkeit. The inevitable arrangement of the spring in an area relatively high Temperature and mostly still within the viscous mass, however, cause one considerable susceptibility to failure.
Die sich negativ auf die Schließgeschwindigkeit auswirkende Tatsache, daß auch nach Beginn der Rückzugbewegung des Spritzkolbens im düsennahen Masseraum des Heizzylinders ein beträchtlicher Massedruck als Folge der im plastifizierten Zu stand vorhandenen Kompressibilität thermoplastischer Kunststoffe bestehenbleibt, nutzt die Erfindung aus. The fact that has a negative effect on the closing speed that even after the start of the retraction movement of the injection plunger in the mass space near the nozzle of the heating cylinder a considerable melt pressure as a result of the plasticized The existing compressibility of thermoplastics remains, exploits the invention.
Sie besteht in der zylindrischen Ausbildung des Bolzenschaftes und dem unmittelbar an ihn anschließenden Anschlagbund, so daß der Verschluß gegen Austritt der im Massezylinder befindlichen Masse ausschließlich durch die mit der Bohrung des Düsenkopfes überdeckende, zwischen Querbohrungen und Anschlagbund des Verschlußbolzens verbleibende Restmantelfläche herbeigeführt wird. Dabei entfällt vorteilhafterweise auch der bei bekannten Düsen die ser Bauart zwischen Düsenkopf und Düse vorhandene schädliche tote Raum. In der Zeichnung ist ein Ausführungsbeispiel schematisch im Schnitt veranschaulicht. Die Viflungsweise sei nachstehend erläutert.It consists in the cylindrical design of the bolt shank and the stop collar immediately adjoining it, so that the closure against leakage the mass located in the mass cylinder exclusively through the one with the bore of the nozzle head overlapping, between the cross bores and the stop collar of the locking bolt remaining surface area is brought about. Advantageously, this does not apply also the existing in known nozzles this type of water between the nozzle head and nozzle harmful dead space. In the drawing, an embodiment is shown schematically in Section illustrates. The method of verification is explained below.
Der Düsenverschluß befindet sich in Sperriage. Die Düse 2 ist von der düsenseitigen Formhälfte 1 getrennt. Der zentrisch im Düsenkopf längs bewegliche Verschlußbolzen 3 befindet sich in vorderer Lage, dabei liegt er mit seinem Anschlagsbund 4 an der Vorderwand des Düsenkopfes an, während die vom Düsenkanal 5 ausgehenden Querbohrungen 6 durch die Innenwand der zylindrischen Bohrung abgedeckt sind. The nozzle lock is in lock carriage. The nozzle 2 is from the nozzle-side mold half 1 separated. The one that can be moved lengthways centrically in the nozzle head Lock bolt 3 is in the front position, while he is with his stop collar 4 on the front wall of the nozzle head, while the outgoing from the nozzle channel 5 Cross holes 6 through the inner wall of the cylindrical bore are covered.
Sobald vor oder bei Beginn des Einspritzvorganges die Düse 2 an die düsenseitige Formhälfte 1 gefahren wird, wird der Bolzen 3 gegen den im Masseraum 7 herrschenden Masse-Restdruck verschoben; dabei gelangen die Querbohrungen 6 außer Deckung und stellen die Verbindung zwischen Masseraum 7 und Düsenkanal 5 her. Dabei wird, allein durch den auf den Querschnitt des Verschlußbolzens 3 wirkenden Massedruck, eine gegenüber dem Austreten von Masse zwischen Verschlußbolzen und düsenseitiger Formhälfte dichte Anlage erzielt. As soon as before or at the beginning of the injection process, the nozzle 2 to the nozzle-side mold half 1 is driven, the bolt 3 is against the in the mass space 7 prevailing residual mass pressure shifted; the transverse bores 6 get out of this Cover and establish the connection between the mass chamber 7 and the nozzle channel 5. Included is, solely through the mass pressure acting on the cross section of the locking bolt 3, one opposite the leakage of mass between the locking bolt and the nozzle-side Mold half-tight system achieved.
Claims (1)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEB33120A DE1014315B (en) | 1954-10-23 | 1954-10-23 | Sealing nozzles for injection molding machines for processing thermoplastics |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEB33120A DE1014315B (en) | 1954-10-23 | 1954-10-23 | Sealing nozzles for injection molding machines for processing thermoplastics |
Publications (1)
Publication Number | Publication Date |
---|---|
DE1014315B true DE1014315B (en) | 1957-08-22 |
Family
ID=6963932
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DEB33120A Pending DE1014315B (en) | 1954-10-23 | 1954-10-23 | Sealing nozzles for injection molding machines for processing thermoplastics |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE1014315B (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1116895B (en) * | 1958-09-16 | 1961-11-09 | Projectile & Engineering Compa | Sealing nozzle for injection molding machines for processing thermoplastics |
DE1189263B (en) * | 1960-10-29 | 1965-03-18 | Desma Werke Gmbh | Injection molding machine for plasticizable materials |
DE1190646B (en) * | 1962-01-08 | 1965-04-08 | Emilio Tittarelli | Device for the backflow and recovery of plasticized substances from injection molding machines or extruders when the injection process is terminated or interrupted |
US3574897A (en) * | 1969-03-21 | 1971-04-13 | Mattel Inc | Injection-molding apparatus |
FR2603839A1 (en) * | 1986-09-17 | 1988-03-18 | Lavandier Noel | Injection nozzle with movable shutter for plastics |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE689328C (en) * | 1937-04-24 | 1940-03-16 | Eckert & Ziegler G M B H | Closure for the nozzle of the mass cylinder of an injection molding machine for plastic masses |
-
1954
- 1954-10-23 DE DEB33120A patent/DE1014315B/en active Pending
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE689328C (en) * | 1937-04-24 | 1940-03-16 | Eckert & Ziegler G M B H | Closure for the nozzle of the mass cylinder of an injection molding machine for plastic masses |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1116895B (en) * | 1958-09-16 | 1961-11-09 | Projectile & Engineering Compa | Sealing nozzle for injection molding machines for processing thermoplastics |
DE1189263B (en) * | 1960-10-29 | 1965-03-18 | Desma Werke Gmbh | Injection molding machine for plasticizable materials |
DE1190646B (en) * | 1962-01-08 | 1965-04-08 | Emilio Tittarelli | Device for the backflow and recovery of plasticized substances from injection molding machines or extruders when the injection process is terminated or interrupted |
US3574897A (en) * | 1969-03-21 | 1971-04-13 | Mattel Inc | Injection-molding apparatus |
FR2603839A1 (en) * | 1986-09-17 | 1988-03-18 | Lavandier Noel | Injection nozzle with movable shutter for plastics |
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