DE618926C - Process for the production of molded parts from synthetic resin - Google Patents
Process for the production of molded parts from synthetic resinInfo
- Publication number
- DE618926C DE618926C DEK125407D DEK0125407D DE618926C DE 618926 C DE618926 C DE 618926C DE K125407 D DEK125407 D DE K125407D DE K0125407 D DEK0125407 D DE K0125407D DE 618926 C DE618926 C DE 618926C
- Authority
- DE
- Germany
- Prior art keywords
- synthetic resin
- production
- molded parts
- pressure
- properties
- 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.)
- Expired
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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/94—Lubricating
-
- 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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/92—Measuring, controlling or regulating
-
- 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
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92504—Controlled parameter
- B29C2948/92514—Pressure
-
- 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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Casting Or Compression Moulding Of Plastics Or The Like (AREA)
Description
Verfahren zur Herstellung von Preßstücken aus Kunstharz Im Hauptpatent 557 268 ist ein Verfahren beschrieben, durch das es ermöglicht wird, beliebig lange Stücke aus Kunstharz und Kunstharz enthaltenden Massen unter Benutzung von verhältnismäßig kleinen, am Austrittsende offenen Formkanälen beliebiger Querschnittsgestalt dadurch herzustellen, daß der zum Pressen notwendige Gegendruck von den Preßlingen selbst ausgeübt wind vermöge einer Klemmwirkung, die herbeigeführt wird durch kegelige Ausgestaltung der Austrittsöffnung des Formkanals bzw. durch Klemmbacken an dieser öffnung. Der gehärtete Preßlingsabschnitt wird durch einen den Preßdruck übersteigenden Druck aus der Austrittsöffnung hinausgetrieben, wobei durch Aufrechterhaltung eines Temperaturgefälles entgegen der Preßrichtung die homogene Verbindung des erstgebildeten Preßlingsab# schnitts mit dem nächstgebildeten gewährleistet ist. Dabei wird das Temperaturgefälle entgegengesetzt zur Preßrichtung unterstützt durch Kühlhalten oder Kühlen des Beschikkungsendes.Process for the production of molded parts from synthetic resin In the main patent 557 268 describes a method by means of which it is possible to take any length of time Pieces of synthetic resin and synthetic resin-containing compositions using relatively small, open at the outlet end mold channels of any cross-sectional shape thereby to produce that the counterpressure necessary for pressing from the compacts themselves exerted wind by virtue of a clamping effect brought about by conical Design of the outlet opening of the molding channel or by means of clamping jaws on this opening. The hardened compact portion is by a pressing pressure exceeding Pressure expelled from the outlet opening, whereby by maintaining a Temperature gradient opposite to the pressing direction the homogeneous connection of the first formed Preßlingsab # section is guaranteed with the next formed. It will Temperature gradient opposite to the pressing direction supported by keeping cool or cooling the end of the load.
Bei Ausführung des Verfahrens nach .der Erfindung hat sich herausgestellt, daß die Festigkeitseigenschaften des Enderzeugnisses mit der Größe des Preßdrucks und je nach den besonderen Eigenschaften des benutzten Stoffes verschieden sind. Schon eine geringe Verschiebung der Klemmstücke, die z. B. durch das Arbeiten der Maschine erfolgt, reicht nämlich, wie gefunden wurde, hin, um dem Endergebnis ungleichmäßige Festigkeitseigenschaften zu verleihen.When performing the method according to the invention, it has been found that the strength properties of the end product with the magnitude of the pressing pressure and are different depending on the particular properties of the substance used. Even a slight displacement of the clamping pieces, the z. B. by working the Machine is done, namely, as was found, enough to make the end result uneven To give strength properties.
Gemäß .der Erfindung wird nun der wirksame Preßdruck auf den Preßstoff durch Änderung der Klemmwirkung am Austrittsende des Formkanals j e nach :den gewünschten Festigkeitseigenschaften des Enderzeugnisses und den Eigenschaften des Ausgangsstoffes geregelt. Damit die Klemmwirkung bei Einstellung gleichmäßig bleibt, ist es von Wichtigkeit, die Innenflächen der Form so gut als irgend möglich zu polieren, da schon ganz geringfügige Aufrauhungen oder Risse in der Politur, die mit dem bloßen Auge kaum wahrnehmbar sind, hinreichen, um den Preßdruck grundlegend zu verändern, so daß die Aufrechterhaltung des eingestellten Drucks nicht gewährleistet ist und sogar ernsthafte Schä4igungen der gesamten Vorrichtung eintreten können.According to the invention, the effective pressure is now applied to the molding material by changing the clamping effect at the exit end of the molding channel depending on: the desired Strength properties of the end product and the properties of the raw material regulated. In order for the clamping effect to remain even when adjusted, it is of Importance of polishing the interior surfaces of the mold as well as humanly possible since even very minor roughening or cracks in the polish, which with the bare Are barely noticeable to the eye, are sufficient to fundamentally change the pressing pressure, so that the maintenance of the set pressure is not guaranteed and even serious damage to the entire device can occur.
Die Wirkung der Hochglanzpolierung wird zweckmäßig unterstützt durch Anwendung von Schmierung, wobei z. B. die Innenflächen des Formkanals oder des Stempels oder beider geschmiert werden können.The effect of the high-gloss polishing is expediently supported by Application of lubrication, e.g. B. the inner surfaces of the molding channel or the punch or both can be lubricated.
Vorteilhaft ist es auch, .die Preßfläche .des Preßstempels nicht konvex auszuführen, da sonst Kräftestreuungen und Keilwirkungen auftreten; die die-Einstellung und Gleichhaltung des Druckes zunichte machen.It is also advantageous if the press surface of the press ram is not convex to execute there otherwise force dispersions and wedge effects occur; which destroy the setting and equalization of the pressure.
Die Klemmwirkung darf=-nicht wesentlich größer sein, als zurErreichung des gewünschten Preßdruckes notwendig ist, so daß das Heraustreiben aus der Kanalöffnung einen möglichst geringen zusätzlichen Druck erfordert. Es ist also nicht zweckmäßig, die Klemmwirkung übermäßig zu erhöhen, da dann wohl sehr hohe Pregdrucke ermöglicht werden, anderseits aber das Herausdrücken außerordentlich erschwert, wenn nicht unmöglich gemacht wird. Auf jeden Fall müßien zum Herausdrücken Preß.drucke angewendet werden, die den gewünschten Preßdruck erheblich übersteigen, so .daß also unnötige Energie verbraucht wird und die Vorrichtung entweder derartigen. Drucken angepaßt werden muß, was naturgemäß technisch schwieriger und auf jeden Fall kostspielig ist, oder aber die Gefahr vorliegt, daß Verbiegungen und Brüche des Stempels und anderer Maschinenteile eintreten.The clamping effect must not be significantly greater than to achieve the desired pressing pressure is necessary so that the drive out of the channel opening requires the least possible additional pressure. So it is not practical to increase the clamping effect excessively, since then probably allows very high pregprints on the other hand, the pushing out is extremely difficult, if not is made impossible. In any case, pressures must be used to push them out that significantly exceed the desired pressure, so .that unnecessary Energy is consumed and the device either such. Printing adjusted must be, which of course is technically more difficult and in any case expensive is, or there is a risk that bends and breaks of the stamp and other machine parts.
Claims (1)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEK125407D DE618926C (en) | 1931-07-31 | 1931-07-31 | Process for the production of molded parts from synthetic resin |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEK125407D DE618926C (en) | 1931-07-31 | 1931-07-31 | Process for the production of molded parts from synthetic resin |
Publications (1)
Publication Number | Publication Date |
---|---|
DE618926C true DE618926C (en) | 1935-09-18 |
Family
ID=7245866
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DEK125407D Expired DE618926C (en) | 1931-07-31 | 1931-07-31 | Process for the production of molded parts from synthetic resin |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE618926C (en) |
-
1931
- 1931-07-31 DE DEK125407D patent/DE618926C/en not_active Expired
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