DE2159089A1 - PROCESS FOR PRODUCING MOLDED PARTS FROM MULTIPLE PLASTICS ON INJECTION MOLDING MACHINES - Google Patents
PROCESS FOR PRODUCING MOLDED PARTS FROM MULTIPLE PLASTICS ON INJECTION MOLDING MACHINESInfo
- Publication number
- DE2159089A1 DE2159089A1 DE19712159089 DE2159089A DE2159089A1 DE 2159089 A1 DE2159089 A1 DE 2159089A1 DE 19712159089 DE19712159089 DE 19712159089 DE 2159089 A DE2159089 A DE 2159089A DE 2159089 A1 DE2159089 A1 DE 2159089A1
- Authority
- DE
- Germany
- Prior art keywords
- injection
- molded parts
- molding machines
- injection molding
- plastics
- 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
- B29C45/16—Making multilayered or multicoloured articles
- B29C45/1642—Making multilayered or multicoloured articles having a "sandwich" structure
-
- 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
- B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
- B29C44/02—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles for articles of definite length, i.e. discrete articles
- B29C44/04—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles for articles of definite length, i.e. discrete articles consisting of at least two parts of chemically or physically different materials, e.g. having different densities
- B29C44/0461—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles for articles of definite length, i.e. discrete articles consisting of at least two parts of chemically or physically different materials, e.g. having different densities by having different chemical compositions in different places, e.g. having different concentrations of foaming agent, feeding one composition after the other
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Description
ANKER V7 E RK NÜRNBERG GMBH +85 NÜRNBERG + Rennweg 37ANKER V7 E RK NÜRNBERG GMBH +85 NUREMBERG + Rennweg 37
auf Spritzgießmaschinenon injection molding machines
Die Erfindung bezieht sich auf ein Verfahren zur Herstellung von Formteilen aus mehreren Kunststoffen auf Spritzgießmaschinen mit mehreren Spritzeinheiten, wobei diese verflüssigten oder plastifizierten Kunststoff zu einer gemeinsamen Einspritzdüse, welche ein Ventil enthält, fördern und worauf dosierte Mengen der Kunststoffe entsprechend der Beaufschlagung der Spritzeinheiten nacheinander über einen Angußkanal in den Formhohlraum einer mehrteiligen Form, die mit der Einspritzdüse zusammenfahrbar ist, gepreßt werden.The invention relates to a method for producing molded parts from several plastics on injection molding machines several injection units, these liquefied or plasticized plastic to a common injection nozzle, which is a Valve contains, promote and whereupon metered amounts of the plastics according to the application of the injection units one after the other via a sprue channel into the mold cavity of a multi-part mold, which can be moved together with the injection nozzle, are pressed.
Spritzgießmaschinen mit mehreren Spritzeinheiten dienen somit dazu. Kunststoffe unterschiedlicher Farbe oder unterschiedlicher Beschaffenheit in den Formhohlraum einzuspritzen. Insbesondere für die Herstellung von Formteilen nach dem sogenannten "Sandwich"-Verfahren werden nacheinander der die kompakte Oberfläche des herzustellenden Teiles bildende festere oder höherwertigere Kunststoff und der den Kern des Teiles erzeugende schaumfähige oder vorgeschäumte oder minderwertigere Kunststoff über den Angußkanal in den Formhohlraum eingespritzt.Injection molding machines with several injection units are used for this. To inject plastics of different colors or different properties into the mold cavity. Especially for the Production of molded parts according to the so-called "sandwich" process are successively the the compact surface of the to be produced Solid or higher quality plastic forming the part and the foamable or pre-expanded plastic forming the core of the part or inferior plastic is injected into the mold cavity through the runner.
Es sind Maschinen zur Durchführung des vorstehend geschilderten Verfahrens bekanntgeworden, bei denen im EinspritzdüsenkörperThere are machines for performing the above Method become known where in the injector body
309822/0677309822/0677
ein Ventil angeordnet ist, das es gestattet, wahlweise einen von zwei Zuführkanälen von den Spritzeinheiten mit einem zur Düsenmündung führenden Kanal der Form zu verbinden ("entweder/oder-Schaltung"). Die beiden Komponenten werden also nacheinander derart eingespritzt, daß immer nur der Zuführkanal derjenigen Komponente, die gerade in die Form gebracht werden soll, geöffnet ist, während der Zuführkanal der anderen Komponente verschlossen bleibt. Es hat sich nun gezeigt, daß bei den Spritzgießmaschinen dieser Gestaltungsart und bei dem geschilderten Verfahrensablauf Schwierigkeiten insofern auftreten, als während der erwähnten Umschaltung eine kurzzeitige Umschaltpause entsteht. Diese übliche Umschaltphase hat den Nachteil, daß der Spritzdruck während dieser Pause um ein beträchtliches abfällt und damit die Fließfront der zuerst eingespritzten Komponente kurzfristig zum Stillstand kommt. Dadurch entstehen dann auf der Oberfläche der herzustellenden Formteile sichtbare Markierungen. Aus der Sicht des Kunststoffverarbeiters sind natürlich solche Erscheinungen, insbesondere bei der Herstellung von in jeder Hinsicht hochwertigen Teilen, unerwünscht.a valve is arranged which allows optionally one of two feed channels from the injection units with one to the nozzle mouth leading channel of the form to connect ("either / or circuit"). So the two components become like this one after the other injected so that only the feed channel of that component that is about to be brought into the mold is open while the feed channel of the other component remains closed. It has now been shown that with the injection molding machines of this type of design and with the process sequence described, difficulties in this respect occur when there is a brief switchover pause during the switchover mentioned. This has the usual switching phase the disadvantage that the injection pressure during this pause by a considerable drops and thus the flow front of the component injected first comes to a standstill for a short time. This creates then visible markings on the surface of the molded parts to be produced. From the plastics processor's point of view of course, such phenomena are undesirable, especially in the manufacture of high-quality parts in every respect.
Es ist daher Aufgabe der vorliegenden Erfindung, durch eine einfache verfahrenstechnische Maßnahme die vorerwähnten Nachteile unter Beibehaltung der bestehenden Vorteile auszuschalten. Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß bereits kurz vor Beendigung des Einspritzvorganges für die erste Komponente der Einspritzvorganr für die nachfolgende Komponente beginnt.It is therefore an object of the present invention to provide a simple procedural measure to eliminate the aforementioned disadvantages while maintaining the existing advantages. This task is achieved according to the invention in that shortly before the end of the injection process for the first component of the injection device for the following component begins.
τ 3 -τ 3 -
309822/0677309822/0677
- i 3 - i 3
Mit dieser verfahrenstechnischen Maßnahme nach der Erfindung werden in verblüffend einfacher Weise die Vorteile erreicht, daß keine Umschal tpause entsteht, daß der Einspritzdruck nicht abfällt und daß daher auch in der betreffenden Form die Fließfront während der gesamten Einspritzphase nicht zum Stillstand kommt. Es entstehen somit auch keine der unerwünschten sichtbaren Oberflächenstörungen auf den hergestellten Formteilen und außerdem können Zeiteinsparungen verzeichnet werden.With this procedural measure according to the invention achieved in an amazingly simple manner the advantages that there is no switching pause, that the injection pressure does not drop and that therefore, even in the form in question, the flow front does not come to a standstill during the entire injection phase. It thus arise also none of the undesirable visible surface defects on the molded parts produced and, moreover, time savings can be achieved be recorded.
Nachdem dadurch das Umschaltventil als solches entfällt (ein Absperrventil kann jedoch vorteilhaft angeordnet bleiben) und die eigentliche Umschaltung kurz vor Beendigung des Einspritzvorganges für die erste Komponente vorzugsweise hydraulisch mittels bekannter Vorrichtungen über eine der beiden Spritzeinheiten (je nach Material-Zuordnung) gesteuert wird, konnte die Erfindung ohne die Durchführung aufwendiger Änderungen in der Maschinensteuerung verwirklicht werden.Since the changeover valve as such is no longer necessary (a shut-off valve can, however, advantageously remain arranged) and the actual switchover shortly before the end of the injection process for the first component, preferably hydraulically using known devices via one of the two injection units (depending on the material assignment) is controlled, the invention could be implemented without making complex changes in the machine control will.
Das erfindungsgemäße Verfahren kann natürlich auch dann sinngemäß ~ zur Anwendung gelangen, wenn beispielsweise mehr als zwei Spritzeinheiten Verwendung finden.The process can also then get mutatis mutandis ~ applicable if, for example, find more than two injection units use.
309822/0677309822/0677
Claims (1)
Priority Applications (9)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19712159089 DE2159089A1 (en) | 1971-11-29 | 1971-11-29 | PROCESS FOR PRODUCING MOLDED PARTS FROM MULTIPLE PLASTICS ON INJECTION MOLDING MACHINES |
| AT965472A AT325843B (en) | 1971-11-29 | 1972-11-14 | INJECTION MOLDING PROCESS FOR PRODUCING MOLDED PARTS FROM MULTIPLE PLASTICS |
| BR821572A BR7208215D0 (en) | 1971-11-29 | 1972-11-22 | MANUFACTURING PROCESS IN THE INJECTION MACHINES OF PROFILED PIECES OF VARIOUS PLASTIC MATERIALS |
| CH1721272A CH538929A (en) | 1971-11-29 | 1972-11-27 | Process for the production of molded parts from several plastics on injection molding machines |
| GB5461972A GB1418034A (en) | 1971-11-29 | 1972-11-27 | Moulding process |
| IT3213572A IT972265B (en) | 1971-11-29 | 1972-11-28 | PROCEDURE FOR THE MANUFACTURING OF SHAPED PIECES MADE OF VARIOUS PLASTIC MATERIALS PRODUCED BY MEANS OF MACHINES TO CARRY OUT GE TI WITH THE INJECTION PROCESS |
| FR7242225A FR2162014B1 (en) | 1971-11-29 | 1972-11-28 | |
| JP11973872A JPS4864143A (en) | 1971-11-29 | 1972-11-29 | |
| NL7216169A NL7216169A (en) | 1971-11-29 | 1972-11-29 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19712159089 DE2159089A1 (en) | 1971-11-29 | 1971-11-29 | PROCESS FOR PRODUCING MOLDED PARTS FROM MULTIPLE PLASTICS ON INJECTION MOLDING MACHINES |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE2159089A1 true DE2159089A1 (en) | 1973-05-30 |
Family
ID=5826453
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DE19712159089 Pending DE2159089A1 (en) | 1971-11-29 | 1971-11-29 | PROCESS FOR PRODUCING MOLDED PARTS FROM MULTIPLE PLASTICS ON INJECTION MOLDING MACHINES |
Country Status (9)
| Country | Link |
|---|---|
| JP (1) | JPS4864143A (en) |
| AT (1) | AT325843B (en) |
| BR (1) | BR7208215D0 (en) |
| CH (1) | CH538929A (en) |
| DE (1) | DE2159089A1 (en) |
| FR (1) | FR2162014B1 (en) |
| GB (1) | GB1418034A (en) |
| IT (1) | IT972265B (en) |
| NL (1) | NL7216169A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0311875A2 (en) * | 1987-10-16 | 1989-04-19 | Battenfeld GmbH | Process and apparatus for making composite articles |
-
1971
- 1971-11-29 DE DE19712159089 patent/DE2159089A1/en active Pending
-
1972
- 1972-11-14 AT AT965472A patent/AT325843B/en not_active IP Right Cessation
- 1972-11-22 BR BR821572A patent/BR7208215D0/en unknown
- 1972-11-27 CH CH1721272A patent/CH538929A/en not_active IP Right Cessation
- 1972-11-27 GB GB5461972A patent/GB1418034A/en not_active Expired
- 1972-11-28 IT IT3213572A patent/IT972265B/en active
- 1972-11-28 FR FR7242225A patent/FR2162014B1/fr not_active Expired
- 1972-11-29 JP JP11973872A patent/JPS4864143A/ja active Pending
- 1972-11-29 NL NL7216169A patent/NL7216169A/xx unknown
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0311875A2 (en) * | 1987-10-16 | 1989-04-19 | Battenfeld GmbH | Process and apparatus for making composite articles |
| EP0311875A3 (en) * | 1987-10-16 | 1989-05-24 | Battenfeld GmbH | Process and apparatus for making composite articles |
Also Published As
| Publication number | Publication date |
|---|---|
| FR2162014B1 (en) | 1975-05-30 |
| CH538929A (en) | 1973-07-15 |
| NL7216169A (en) | 1973-06-01 |
| GB1418034A (en) | 1975-12-17 |
| FR2162014A1 (en) | 1973-07-13 |
| BR7208215D0 (en) | 1973-08-30 |
| AT325843B (en) | 1975-11-10 |
| JPS4864143A (en) | 1973-09-05 |
| IT972265B (en) | 1974-05-20 |
| ATA965472A (en) | 1975-01-15 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| OHW | Rejection |