DE1130153B - Process for the production of injection molded parts from thermoplastic material - Google Patents
Process for the production of injection molded parts from thermoplastic materialInfo
- Publication number
- DE1130153B DE1130153B DEN11459A DEN0011459A DE1130153B DE 1130153 B DE1130153 B DE 1130153B DE N11459 A DEN11459 A DE N11459A DE N0011459 A DEN0011459 A DE N0011459A DE 1130153 B DE1130153 B DE 1130153B
- Authority
- DE
- Germany
- Prior art keywords
- molding
- production
- injection molded
- elasticity
- molded parts
- 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
- B29C45/0053—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor combined with a final operation, e.g. shaping
-
- 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
- B29C35/00—Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
- B29C35/02—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould
- B29C35/0222—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould the curing continuing after removal from the mould
-
- 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
- B29C45/40—Removing or ejecting moulded articles
- B29C45/44—Removing or ejecting moulded articles for undercut articles
- B29C45/4407—Removing or ejecting moulded articles for undercut articles by flexible movement of undercut portions of the articles
-
- 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
- B29C71/00—After-treatment of articles without altering their shape; Apparatus therefor
- B29C71/04—After-treatment of articles without altering their shape; Apparatus therefor by wave energy or particle radiation, e.g. for curing or vulcanising preformed articles
-
- 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
- B29C45/0053—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor combined with a final operation, e.g. shaping
- B29C2045/0075—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor combined with a final operation, e.g. shaping curing or polymerising by irradiation
-
- 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)
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Oral & Maxillofacial Surgery (AREA)
- Thermal Sciences (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
Description
Verfahren zur Herstellung von Spritzgußteilen aus thermoplastischem Kunststoff Spritzgußteile aus thermoplastischem Kunststoff werden in der Weise hergestellt, daß der warmilüssige Werkstoff unter Druck durch eine verhältnismäßig kleine Öffnung in eine kalte oder angewärmte Form eingespritzt wird, in der er erstarrt. Die Entformung erfolgt im allgemeinen durch Öffnen der Spritzgußform, indem die Formplatte und die Kopfplatte auseinandergefahren werden. Der Formling kann dann, sofern es sich um einen Formling einfacher Form handelt, aus der Formplatte herausgenommen oder ausgestoßen werden. Process for the production of injection molded parts from thermoplastic Plastic injection molded parts made of thermoplastic material are produced in such a way that that the warm-liquid material under pressure through a relatively small opening is injected into a cold or warmed mold in which it solidifies. The demolding is generally done by opening the injection mold, removing the mold plate and the head plate can be moved apart. The molding can then, provided it is is a molding of simple shape, removed from the mold plate or be expelled.
Handelt es sich aber um Formlinge komplizierter Gestalt, d. h. um Formlinge, die außen oder innen mit Unebenheiten versehen sind, so ist das Ausstoßen aus der Form nicht ohne weiteres möglich. In diesen Fällen wird die Form geteilt oder als sogenannte Backenform mit zwei oder mehr Backen ausgeführt, oder es wird, sofern sich die Unebenheiten im Innern des Formlings befinden, der Werkzeugkern, von dem der Formling abgestreift werden muß, mehrteilig ausgeführt. Die Ausführung der Spritzgußform als Bakkenform oder die Verwendung eines mehrteiligen Kernes kompliziert und verteuert damit die Herstellung der Form erheblich, insbesondere wenn es sich um kleinere Spritzgußteile, beispielsweise um Spulenkörper für Hochfrequenzspulen, handelt. Vor allem die Einzelteile der Kerne werden dann so klein und kompliziert, daß sie einerseits mechanische Präzisionsarbeit erfordern, andererseits aber auch so zerbrechlich sind, daß sie trotz sorgEåltiger Behandlung oftmals zu Bruch gehen. Teile unter einer bestimmten Mindestgröße lassen sich zu wirtschaftlich tragbaren Kosten oftmals überhaupt nicht anfertigen. But if it is a question of moldings of complex shape, d. H. around Moldings that are bumpy on the outside or inside are the way to eject not easily possible from the form. In these cases the shape is split or designed as a so-called jaw shape with two or more jaws, or it is, if the bumps are inside the molding, the tool core, from which the molding must be stripped, executed in several parts. Execution the injection mold as a Bakkenform or the use of a multi-part core complicated and thus makes the production of the mold considerably more expensive, especially if it is around smaller injection molded parts, for example around bobbins for high-frequency coils, acts. Above all, the individual parts of the cores then become so small and complicated that that they require mechanical precision work on the one hand, but also on the other hand are so fragile that, despite careful handling, they often break. Parts below a certain minimum size can be made economically viable Often times, do not produce costs at all.
Es ist bekannt, Preß- oder Spritzteile mit Hinterschneidungen in der Weise herzustellen, daß beim Preßvorgang in einem einzigen Arbeitsgang der die Hinterschneidung bewirkende Stempel aus dem Werkstück, das dabei eine Temperatur haben muß, bei der es noch hinreichend verformbar ist, unter Ausnutzung der elastischen oder bleibenden Verformbarkeit des Werkstoffes vor der Abkühlung entfernt wird. It is known to have molded or molded parts with undercuts in produce the way that the pressing process in a single operation Undercut causing stamp from the workpiece, which thereby a temperature must have, at which it is still sufficiently deformable, taking advantage of the elastic or permanent deformability of the material is removed before cooling.
Gegenstand der Erfindung ist auch ein Verfahren zur Herstellung von Spritzgußteilen aus thermoplastischem Kunststoff, insbesondere von Teilen komplizierter Formgebung. Unter Teilen mit komplizierter Formgebung sind solche Teile zu verstehen, die sich infolge von Oberflächenunebenheiten nicht ohne weiteres entformen lassen oder aus denen sich der Kern nicht ohne weiteres entfernen läßt. The invention also relates to a process for the production of Injection molded parts made of thermoplastic material, especially parts that are more complicated Shaping. Parts with a complicated shape are to be understood as such parts which cannot be easily demolded due to surface unevenness or from which the core cannot be easily removed.
Erfindungsgemäß wird die Herstellung solcher Spritzgußteile mit einfachen Formen dadurch ermöglicht, daß zuerst aus einem Kunststoff, bei dem bei der Abkühlung nur eine teilweise Vernetzung eintritt, ein Formling solcher Elastizität hergestellt wird, daß die Entformung unter Ausnutzung der Elastizität des Formlings erfolgen kann, und dieser Formling nach der Entformung einer Behandlung unterworfen wird, die eine weitere Vernetzung und Härtung des Materials bewirkt.According to the invention, the production of such injection molded parts is simple Shaping made possible by first of a plastic, which when cooling If only partial crosslinking occurs, a molding of such elasticity is produced that the demolding take place using the elasticity of the molding can, and this molding is subjected to a treatment after demolding, which causes further crosslinking and hardening of the material.
Es ist bekannt, daß sich Kunststoffe je nach dem Grad der Vernetzung mit sehr unterschiedlicher Elastizität und Härte herstellen lassen, beginnend von ausgesprochen plastischen Stoffen über weichelastische zu hartelastischen und schließlich ausgesprochen spröden Körpern. Es ist auch bekannt, daß sich der Vernetzungsgrad und damit die Elastizität eines Kunststoffkörpers auch nach der endgültigen Formgebung ändern lassen, beispielsweise durch Be strahlung mit Röntgen- oder Elektronenstrahlen oder einer ähnlichen energiereichen Strahlung. Beim Gegenstand der Erfindung werden diese bekannten Eigenschaften der Kunststoffe ausgenutzt. It is known that plastics differ depending on the degree of crosslinking Can be produced with very different elasticity and hardness, starting from decidedly plastic materials over soft elastic to hard elastic and finally extremely brittle bodies. It is also known that the degree of crosslinking and thus the elasticity of a plastic body even after the final shape can be changed, for example by exposure to X-rays or electron beams or a similar high-energy radiation. When the subject of the invention exploited these well-known properties of plastics.
Das erfindungsgemäße Verfahren hat vor allem den Vorteil, daß die Verwendung einfacher Werkzeuge, z. B. einer einteiligen Form an Stelle einer zerlegbaren oder einer Backenform oder ein einteiliger Kern an Stelle mehrteiliger Kerne, möglich ist. The inventive method has the main advantage that the Use of simple tools, e.g. B. a one-piece mold instead of a collapsible one or a jaw shape or a one-piece core instead of multi-part cores, possible is.
Der nachgiebige Formling kann unter Ausnutzung seiner hohen Elastizität aus der Form auch dann herausgezogen werden, wenn diese beispielsweise an einzelnen Stellen sich in der Richtung des Ausziehens verjüngt. Ebenso kann aus dem elastischen Formling ein Kern im ganzen herausgezogen werden, der Einschnürungen oder Wulste aufweist, beispielsweise ein Gewinde. Solche Gewindekerne mußten bisher aus dem Formling herausgeschraubt werden, was einen wesentlich zeitraubenderen eigenen Arbeitsgang erfordert als das einfache Herausstoßen des Kernes aus dem elastischen Formling.The flexible molding can take advantage of its high elasticity can also be pulled out of the mold if this is, for example, on individual Make themselves tapered in the direction of pulling out. Likewise, from the elastic Forming a core in the whole can be pulled out, the constrictions or bulges has, for example a Thread. Such thread cores had to previously unscrewed from the molding, which is a much more time-consuming requires its own work process than simply pushing the core out of the elastic Molding.
Bei dem Nachhärten durch Bestrahlung kann die gewünschte Elastizität des Formlings eingestellt werden. When post-curing by irradiation, the desired elasticity can be achieved of the molding can be adjusted.
Beim erfindungsgemäßen Verfahren ist der Formling beim Ausstoßen aus der Form so weit teilweise vernetzt, daß durch die beim Entformen auftretenden Einwirkungen keine bleibenden Formänderungen hervorgerufen werden, d. h., daß der Formling sich diesen Einwirkungen gegenüber nicht mehr plastisch verhält, anderseits aber eine solche Elastizität aufweist, daß er den beim Entformen notwendigen Formänderungen elastisch nachgibt. Die Vorvernetzung wird jedoch nur so weit getrieben, daß nicht nur die beim Entformen erwünschte Elastizität, sondern auch die Spritzbarkeit des Materials erhaltenbleibt. Bei der nachfolgenden Härtung wird der Elastizitätsmodul dann so weit gesteigert, daß auch größere Krafteinwirkungen auf den Kunststoffteil keine plastische oder über das zulässige oder erwünschte Maß hinausgehende elastische Verformung zur Folge haben. In the method according to the invention, the molding is in the process of being ejected partially cross-linked from the mold to such an extent that the occurring during demolding No permanent changes in shape are caused, d. i.e. that the Formling no longer behaves plastically to these effects, on the other hand but has such elasticity that it can accommodate the changes in shape required during demolding yields elastically. However, the pre-networking is only pushed so far that not only the desired elasticity when demoulding, but also the injectability of the Material is preserved. During the subsequent hardening, the modulus of elasticity becomes then increased so much that greater forces act on the plastic part no plastic ones or elastic ones that go beyond the permissible or desired amount Cause deformation.
Nach dem erfindungsgemäßen Verfahren ist es beispielsweise möglich, in einfacher Weise Formlinge von im wesentlichen zylindrischer Form herzustellen; die gleichzeitig Längs- und Querrippen aufweisen. According to the method according to the invention, it is possible, for example, to produce moldings of substantially cylindrical shape in a simple manner; which have longitudinal and transverse ribs at the same time.
Desgleichen können rohrförmige Körper hergestellt werden, die an der Innenseite Längs- und Querrippen besitzen. Die Herstellung solcher Formlinge war nach den bisher bekannten Verfahren nur durch Anwendung von Backenformen bzw. mehrteiligen Kernen möglich, wobei es jedoch unvermeidbar war, daß sich an dem Formling die Fugen der zusammengesetzten Form- oder Kernteile als Gußnähte abzeichneten. Das erfindungsgemäße Verfahren ermöglicht es, solche Teile unter Anwendung wesentlich einfacherer und damit billigerer Formen herzustellen, ohne daß solche Gußnähte auftreten.Likewise, tubular bodies can be produced that are attached to the Inside have longitudinal and transverse ribs. The production of such moldings was according to the previously known method only through the use of jaw molds or multi-part Cores possible, but it was inevitable that the joints of the molding composite molded or core parts emerged as cast seams. The inventive Method makes it possible to use such parts much simpler and thus producing cheaper shapes without such cast seams occurring.
Claims (2)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEN11459A DE1130153B (en) | 1955-11-18 | 1955-11-18 | Process for the production of injection molded parts from thermoplastic material |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEN11459A DE1130153B (en) | 1955-11-18 | 1955-11-18 | Process for the production of injection molded parts from thermoplastic material |
Publications (1)
Publication Number | Publication Date |
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DE1130153B true DE1130153B (en) | 1962-05-24 |
Family
ID=7339425
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DEN11459A Pending DE1130153B (en) | 1955-11-18 | 1955-11-18 | Process for the production of injection molded parts from thermoplastic material |
Country Status (1)
Country | Link |
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DE (1) | DE1130153B (en) |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2319475A1 (en) * | 1975-07-29 | 1977-02-25 | Anger Anton Maschbau | PROCESS FOR MANUFACTURING PLASTIC FITTINGS AND INJECTION MOLD ASSEMBLY FOR THE IMPLEMENTATION OF THIS PROCESS |
EP0081796A1 (en) * | 1981-12-11 | 1983-06-22 | Dynamit Nobel Aktiengesellschaft | Polyethylene cartridge |
FR2596282A1 (en) * | 1986-03-27 | 1987-10-02 | Draegerwerk Ag | RESPIRATORY MASK MADE OF AN ELASTIC MOLDED BODY |
EP0256825A2 (en) * | 1986-08-18 | 1988-02-24 | British Gas plc | Structures of plastics material |
EP0269217A2 (en) * | 1986-11-24 | 1988-06-01 | Johnson Controls, Inc. | Method of injection moulding and plastic part formed thereby |
WO2004103677A1 (en) * | 2003-05-16 | 2004-12-02 | Dupont Dow Elastomers L.L.C. | Process for preparing uv curable sealing assemblies |
DE102008042301A1 (en) * | 2008-08-12 | 2010-02-25 | Maincor Ag | Plastic tube manufacturing method for e.g. flow-type heater, involves inserting connecting piece including connecting geometry deviated from cross sectional geometry of plastic tube to end of plastic tube |
WO2016034761A1 (en) * | 2014-09-01 | 2016-03-10 | Ledil Oy | Process and mold for fabricating an optical device, and an optical device |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE599895C (en) * | 1931-05-12 | 1934-07-11 | Int Galalith Ges Hoff & Co | Process for the production of molded articles from molding compounds |
DE834140C (en) * | 1949-12-02 | 1952-03-17 | Emil Schuster | Method and device for the production of pressed or molded parts with undercuts |
-
1955
- 1955-11-18 DE DEN11459A patent/DE1130153B/en active Pending
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE599895C (en) * | 1931-05-12 | 1934-07-11 | Int Galalith Ges Hoff & Co | Process for the production of molded articles from molding compounds |
DE834140C (en) * | 1949-12-02 | 1952-03-17 | Emil Schuster | Method and device for the production of pressed or molded parts with undercuts |
Cited By (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2319475A1 (en) * | 1975-07-29 | 1977-02-25 | Anger Anton Maschbau | PROCESS FOR MANUFACTURING PLASTIC FITTINGS AND INJECTION MOLD ASSEMBLY FOR THE IMPLEMENTATION OF THIS PROCESS |
EP0081796A1 (en) * | 1981-12-11 | 1983-06-22 | Dynamit Nobel Aktiengesellschaft | Polyethylene cartridge |
FR2596282A1 (en) * | 1986-03-27 | 1987-10-02 | Draegerwerk Ag | RESPIRATORY MASK MADE OF AN ELASTIC MOLDED BODY |
EP0256825A2 (en) * | 1986-08-18 | 1988-02-24 | British Gas plc | Structures of plastics material |
EP0256825A3 (en) * | 1986-08-18 | 1990-06-20 | British Gas Plc | Structures of plastics material |
EP0269217A2 (en) * | 1986-11-24 | 1988-06-01 | Johnson Controls, Inc. | Method of injection moulding and plastic part formed thereby |
EP0269217A3 (en) * | 1986-11-24 | 1989-11-29 | Johnson Controls, Inc. | Method of injection moulding and plastic part formed thereby |
WO2004103677A1 (en) * | 2003-05-16 | 2004-12-02 | Dupont Dow Elastomers L.L.C. | Process for preparing uv curable sealing assemblies |
US7517486B2 (en) | 2003-05-16 | 2009-04-14 | Du Pont Performance Elastomers L.L.C. | Process for preparing UV curable sealing assemblies |
AU2004241254B2 (en) * | 2003-05-16 | 2009-10-29 | E.I. Du Pont De Nemours And Company | Process for preparing UV curable sealing assemblies |
DE102008042301A1 (en) * | 2008-08-12 | 2010-02-25 | Maincor Ag | Plastic tube manufacturing method for e.g. flow-type heater, involves inserting connecting piece including connecting geometry deviated from cross sectional geometry of plastic tube to end of plastic tube |
WO2016034761A1 (en) * | 2014-09-01 | 2016-03-10 | Ledil Oy | Process and mold for fabricating an optical device, and an optical device |
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