DE1115009B - Process for producing molded articles from castable plastics - Google Patents
Process for producing molded articles from castable plasticsInfo
- Publication number
- DE1115009B DE1115009B DE1959P0022865 DEP0022865A DE1115009B DE 1115009 B DE1115009 B DE 1115009B DE 1959P0022865 DE1959P0022865 DE 1959P0022865 DE P0022865 A DEP0022865 A DE P0022865A DE 1115009 B DE1115009 B DE 1115009B
- Authority
- DE
- Germany
- Prior art keywords
- nests
- molded articles
- castable
- plastic
- producing molded
- 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
- B29C39/00—Shaping by casting, i.e. introducing the moulding material into a mould or between confining surfaces without significant moulding pressure; Apparatus therefor
- B29C39/02—Shaping by casting, i.e. introducing the moulding material into a mould or between confining surfaces without significant moulding pressure; Apparatus therefor for making articles of definite length, i.e. discrete articles
- B29C39/04—Shaping by casting, i.e. introducing the moulding material into a mould or between confining surfaces without significant moulding pressure; Apparatus therefor for making articles of definite length, i.e. discrete articles using movable moulds not applied
- B29C39/08—Introducing the material into the mould by centrifugal force
-
- 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
- B29C39/00—Shaping by casting, i.e. introducing the moulding material into a mould or between confining surfaces without significant moulding pressure; Apparatus therefor
- B29C39/02—Shaping by casting, i.e. introducing the moulding material into a mould or between confining surfaces without significant moulding pressure; Apparatus therefor for making articles of definite length, i.e. discrete articles
- B29C39/021—Shaping by casting, i.e. introducing the moulding material into a mould or between confining surfaces without significant moulding pressure; Apparatus therefor for making articles of definite length, i.e. discrete articles by casting in several steps
- B29C39/025—Shaping by casting, i.e. introducing the moulding material into a mould or between confining surfaces without significant moulding pressure; Apparatus therefor for making articles of definite length, i.e. discrete articles by casting in several steps for making multilayered articles
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Casting Or Compression Moulding Of Plastics Or The Like (AREA)
- Moulding By Coating Moulds (AREA)
Description
Verfahren zum Herstellen von Formartikeln aus gießbaren Kunststoffen Die Erfindung befaßt sich mit einem Verfahren zum Herstellen von Formartikel im Gieß-, Schleudergieß-, Druckgieß- und Spritzverfahren. Beispiele derartiger Form artikel sind Türkeile, Dichtungselemente, Puffer. Process for the production of molded articles from castable plastics The invention relates to a method for producing molded articles in Casting, centrifugal casting, die casting and injection molding processes. Examples of such a shape items are door wedges, sealing elements, buffers.
Es ist bekannt, Formartikel aus gießbaren Kunststoffen herzustellen, indem in einer Schleudertrommel Nester angebracht werden, die über eine peripher verlaufende Rinne zugänglich sind. Der flüssige Kunststoff wird in die Rinne der rotierenden Schleudervorrichtung eingefüllt und fließt in die Nester, die einen Hohlraum entsprechend den herzustellenden Form artikeln aufweisen. Wegen der Eigenart der Kunststoffe ist es üblich, den Schleudervorgang unter Wärmeeinwirkung so lange fortzusetzen, bis das gießbare Material in den Nestern erhärtet ist. It is known to produce molded articles from castable plastics, by placing nests in a centrifugal drum, which have a peripheral running gutter are accessible. The liquid plastic gets into the gutter of the rotating centrifugal device is filled and flows into the nests, which one Have a cavity according to the shape to be produced articles. Because of the peculiarity It is common for plastics to spin for so long under the action of heat continue until the castable material has hardened in the nests.
Würde die Schleudervorrichtung vorzeitig stillgesetzt werden, müßte notwendigerweise das flüssige Material aus den in der Schleudertrommel gerade oben befindlichen Nestern ausfließen. Bei den gebräuchlichen elastischen Stoffen, wie Polyesterurethanen oder Polyätherurethanen, dauert der Polymerisationsvorgang in Abhängigkeit von der Härte längere Zeit, und zwar bis zu 30 Minuten. Für diese Zeitspanne ist die Schleudergießvorrichtung besetzt, so daß es nicht möglich ist, die Vorrichtung zum Auffüllen weiterer Nester zu verwenden. Für andere Herstellungsvorgänge trifft dies ebenso insofern zu, als die Herstellungsvorrichtung bis zum Erhärten des Kunststoffes in den Nestern besetzt ist.If the spinning device were to be stopped prematurely, it would have to necessarily the liquid material from the ones in the spin drum just above existing nests flow out. In the case of the elastic fabrics in use, such as Polyester urethanes or polyether urethanes, the polymerization process takes in Depending on the hardness, a longer time, up to 30 minutes. For this period of time the centrifugal casting device is occupied so that it is not possible to use the device to be used to fill up further nests. For other manufacturing operations This is also true insofar as the manufacturing device until the plastic has hardened is occupied in the nests.
Die Erfindung geht von der Aufgabenstellung aus, diesen Zeitverlust für die übermäßig lange Inanspruchnahme der Schleudergießvorrichtung zu beseitigen. The invention is based on the problem, this loss of time for the excessive use of the centrifugal caster.
Die Lösung der Aufgabe besteht im Grundgedanken darin, daß die Formnester nach dem Füllen mit dem gießbaren elastomeren Kunststoff mit einem schneller als der eingefüllte Kunststoff erhärtenden Kunstharz verschlossen werden. Geeignete Stoffe sind in größerer Menge bekannt. Beispielsweise können einige durch Katalysatoren zur beschleunigten Härtung eingestellte Polyesterharze, Styrolharze oder Formaldehydharze verwendet werden. Diese Maßnahme bewirkt, daß die mit dem schnell erhärtendem Material verschlossenen Formnester nach wenigen Minuten aus der Schleuderform herausgenommen werden können und im Wärmeschrank einer endgültigen Verfestigung ausgesetzt werden. Unmittelbar nach dem Entfernen der Nester aus der Schleudergießvorrichtung kann diese mit neuen und leeren Nestern beschickt werden. Die Formteile lassen sich aus den Nestern entnehmen, ohne daß die verschließenden Kunstharzteile hinderlich sind.The solution to the problem is basically that the mold cavities after filling with the moldable elastomeric plastic with a faster than the filled plastic can be sealed with hardening synthetic resin. Suitable Substances are known in large quantities. For example, some can be through catalysts polyester resins, styrene resins or formaldehyde resins adjusted for accelerated curing be used. This measure causes that with the rapidly hardening material The closed cavity is removed from the centrifugal mold after a few minutes can be and are subjected to a final solidification in the heating cabinet. Immediately after removing the nests from the centrifugal casting device these are loaded with new and empty nests. The molded parts can be omitted remove the nests without the sealing resin parts being a hindrance.
Bei Bedarf kann an den Trenastellen zwischen den Elastomeren und dem zum Schließen dienenden Harz in den Nestern oder in dem angrenzenden Bereich der Einflußstelle eine entsprechende Markierung vorgesehen sein. Diese dienen dazu, leichter zu erkennen, wo die Einflußrückstände vom Formteil abzutrennen sind. Besonders vorteilhaft an diesem Verfahren ist, daß die Schleudergießvorrichtung infolge dieser Maßnahme eine wesentlich größere Kapazität erhält und je nach Art der Nesteranbringung der Ausstoß für die einzelne Schleudergußform an Formartikeln das Zehnfache betragen kann. Die Säuberung von Kanälen, Spritzköpfen und Einfluß öffnungen stößt bei diesem Verfahren auf keine großen Schwierigkeiten, da das Kunstharz sich leicht entfernen läßt. If necessary, at the Trena points between the Elastomers and the to close serving resin in the nests or in the adjacent area of the Influence point a corresponding marking can be provided. These serve to easier to see where the influence residues are to be separated from the molded part. Particularly The advantage of this method is that the centrifugal casting device as a result of this Measure receives a much larger capacity and depending on the type of nest attachment the output for the individual centrifugal casting mold of molded articles can be ten times as high can. The cleaning of channels, spray heads and inlet openings comes up against this Procedure does not pose much difficulty as the resin will easily remove leaves.
Die Erfindung wird an den Abb. 1 und 2 beispielsweise erläutert. The invention is illustrated in FIGS. 1 and 2, for example.
Abb. 1 zeigt eine Schleudergießvorrichtung 1, die auf einer Achse 2 befestigt ist. Während des Gießvorganges kann diese Vorrichtung in Rotation versetzt werden. Am inneren Umfang der Schleudergießvorrichtung 1 sind Nester 3 befestigt, die entsprechend dem zu verfertigenden Formartikel ausgebildet sind. Fig. 1 shows a centrifugal casting device 1, which is on an axis 2 is attached. This device can be set in rotation during the casting process will. On the inner circumference of the centrifugal casting device 1, nests 3 are attached, which are designed according to the molded article to be manufactured.
Der gießbare elastische Kunststoff wird durch die Zuführkanäle 4 in die Nester 3 eingegossen. Die an diesem Zuführkanal liegende Rinne 5 verläuft in peripherischer Richtung und dient zum Eingießen des Kunststoffes während der Rotation der Schleudergießvorrichtung. Nach dem Einfüllen des Kunststoffes wird die ganze Vorrichtung in einer abgeschlossenen beheizten Kammer in Rotation gehalten.The castable elastic plastic is fed through the feed channels 4 in the nests 3 poured in. The channel 5 lying on this feed channel runs in peripheral direction and is used to pour the plastic during rotation the centrifugal caster. After filling the plastic, the whole Device kept rotating in a closed heated chamber.
Abb. 2 zeigt die gleiche Anordnung nach Abb. 1 im senkrechten Schnitt dazu. Die Schleudergießvorrichtung 1 ist an der Achse 2 befestigt, die auf den Lagern 6 und 7 ruht. Die Nester 3 stehen über einen Zuführkanal 4 mit der Rinne 5 in Verbindung, in die der flüssige Kunststoff eingefüllt wird. Die für die Form artikel vorgesehene Menge wird so bemessen, daß der Zuführkanal 4 etwa bis zur Hälfte gefüllt ist. Fig. 2 shows the same arrangement according to Fig. 1 in vertical section to. The centrifugal caster 1 is attached to axis 2, which rests on bearings 6 and 7. The nests 3 stand with a feed channel 4 the channel 5 in connection, into which the liquid plastic is poured. The for the shape article provided amount is dimensioned so that the feed channel 4 about is half full.
Gegebenenfalls kann der schnell härtende Kunststoffteil auch bis an den Rand des Nestes oder des Formartikels reichen.If necessary, the fast-curing plastic part can also be used up to reach the edge of the nest or molded article.
Ist der elastomere Kunststoff in die Nester 3 eingefüllt, wird in den oberen Teilen des Zuführkanals 4 das schnell härtende Kunstharz gegeben. Unmittelbar nach dem Erhärten kann die Schleudergießvorrichtung stillgesetzt werden, um die Nester zu entfernen und die Schleudergießvorrichtung mit neuen Nestern zu beschicken. Once the elastomeric plastic has been filled into the nests 3, in the upper parts of the feed channel 4 are given the fast-curing synthetic resin. Direct after hardening, the centrifugal casting device can be shut down in order to remove the Remove nests and load the centrifugal caster with new nests.
Claims (2)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE1959P0022865 DE1115009B (en) | 1959-05-29 | 1959-05-29 | Process for producing molded articles from castable plastics |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE1959P0022865 DE1115009B (en) | 1959-05-29 | 1959-05-29 | Process for producing molded articles from castable plastics |
Publications (1)
Publication Number | Publication Date |
---|---|
DE1115009B true DE1115009B (en) | 1961-10-12 |
Family
ID=600329
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE1959P0022865 Pending DE1115009B (en) | 1959-05-29 | 1959-05-29 | Process for producing molded articles from castable plastics |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE1115009B (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1225372B (en) * | 1961-05-04 | 1966-09-22 | Graydons Ind & Marine Plastics | Device for manufacturing objects from plastic |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE831772C (en) * | 1952-11-18 | 1952-02-18 | Bayer Ag | Process for the production of high molecular weight crosslinked plastics |
-
1959
- 1959-05-29 DE DE1959P0022865 patent/DE1115009B/en active Pending
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE831772C (en) * | 1952-11-18 | 1952-02-18 | Bayer Ag | Process for the production of high molecular weight crosslinked plastics |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1225372B (en) * | 1961-05-04 | 1966-09-22 | Graydons Ind & Marine Plastics | Device for manufacturing objects from plastic |
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