CH274039A - Process for casting synthetic resins which polymerize under atmospheric pressure. - Google Patents
Process for casting synthetic resins which polymerize under atmospheric pressure.Info
- Publication number
- CH274039A CH274039A CH274039DA CH274039A CH 274039 A CH274039 A CH 274039A CH 274039D A CH274039D A CH 274039DA CH 274039 A CH274039 A CH 274039A
- Authority
- CH
- Switzerland
- Prior art keywords
- mold
- vacuum
- resin
- casting
- atmospheric pressure
- Prior art date
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
- B29C39/22—Component parts, details or accessories; Auxiliary operations
- B29C39/42—Casting under special conditions, e.g. vacuum
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- 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
- B29C31/00—Handling, e.g. feeding of the material to be shaped, storage of plastics material before moulding; Automation, i.e. automated handling lines in plastics processing plants, e.g. using manipulators or robots
- B29C31/04—Feeding of the material to be moulded, e.g. into a mould cavity
- B29C31/041—Feeding of the material to be moulded, e.g. into a mould cavity using filling or dispensing heads placed in closed moulds or in contact with mould walls
-
- 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
- B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
- B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
- B29C70/28—Shaping operations therefor
- B29C70/30—Shaping by lay-up, i.e. applying fibres, tape or broadsheet on a mould, former or core; Shaping by spray-up, i.e. spraying of fibres on a mould, former or core
- B29C70/36—Shaping by lay-up, i.e. applying fibres, tape or broadsheet on a mould, former or core; Shaping by spray-up, i.e. spraying of fibres on a mould, former or core and impregnating by casting, e.g. vacuum casting
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
- B29K2105/06—Condition, form or state of moulded material or of the material to be shaped containing reinforcements, fillers or inserts
- B29K2105/16—Fillers
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Robotics (AREA)
- Chemical & Material Sciences (AREA)
- Composite Materials (AREA)
- Casting Or Compression Moulding Of Plastics Or The Like (AREA)
Description
Verfahren zum Vergiessen von unter Atmosphärendruck polymerisierenden Kunstharzen.
Kunstharze, die lediglich unter Einwir- kung von Warme und Katalysatoren, ohne Anwendung von Druck, zu nicht mehr erweichbaren St cken polymerisiert werden k¯nnen und die zudem die Eigenschaft besit zen, heim Aushärten seiher keine flüchtigen Bestandteile abnyeben, können unter Atmo- sphÏrendruck zu blasenfreien St cken verar beitet werden. Dies ist möglieh, sofern die Teile, mit welehen sie dabei in Berührung kommen, selbst keine Luft abgeben, das wu giessende Stück eine solche geometrische Form besitzt, die beim Giessen sich nicht entlüftende Luftsäcke ausschliesst und,
sofern das Harz nicht als Bindemittel f r ein Material verwen- det wird, bei welehem die Luft aus der loeke ren F llung nur schlecht entweichen kann.
Teile, die Luft abgeben, liegen zum Beispie] dann vor, wenn Wicklungen von elektri- schen Apparaten und VTaschinen ausgegossen werden, die als Isolation Faserstoffe, beispielsweise Baumwolle, Papier und dergleiehen, enthalten. Im Harz zurüekbleibende Luft kann, wenn sie in elektriseh beanspruehten Teilen liegt, zu unerw nschten Durchschlagen führen, so dass man solche Luftsäcke zu vermeiden trachtet.
(egenstand der Erfindung ist ein Verfah- ren zum Vergiessen von unter Atmosphärendruck polymerisierenden Kunstharzen. Die Erfindung besteht darin, dass das flüssige Harz unter Vakuum vergossen wird.
Im folgenden wird das Verfahren an Hand der beiliegenden Zeichnung beispielsweise erläutert.
Man kann die Giessform so bauen, da¯ sie direkt evakuiert werden kann, wobei das flüssige Harz direkt in die Form eingegossen wird.
In Fig. l der Zeiehnung ist eine solehe Einrichtung für die Herstellung eines Rohres im Sehnitt dargestellt.
Mit 1 ist die vakuumfeste äussere Gie¯iorm, mit 2 die Eernform und mit 3 der aus zugiessende Raum bezeichnet. 4 ist der va kuumfeste Deckel mit dem Anschluss 5 f r die Vakuumpumpe und dem Harzeinlaufrohr 6, welches einen vakuumdichten Absehluss- hahn 7 aufweist. Der Deckel 4 wird unter Zwisehenlegen einer Dichtung 8 mit der Ïu¯ern Form 1 verschraubt.
Alan kann aber auch eine nicht vakuumfeste Form in einem besonderen vakuumfesten Behälter evakuieren, wie dies beispielsweise in Fig. 2 im Schnitt dargestellt ist.
11 ist ein vakuumfester Behälter, welcher in seinem Innern eine nicht vakuumfeste Giessform 22 und ein Gefäss 23 zur Entspan- nung des Harzes enthÏlt. 24 ist das schwenkbare Verbindungsrohr zwischen dem Gefäss 23 und der Giessform 22. 5 ist der Anschluss für die Vakuumpumpe, und 4 ist der Deekel des Behälters 11, in welchem das Einlaufrohr 6 mit dem Vakuumventil 7 befestigt ist.
Das Harz fliesst durch das Rohr 6 in den Behälter 23, von wo es in entspanntem Zustand unter der Wirkung des Eigengewichtes durch das Verbindungsrohr 24 in die Gie¯form 22 l@uft.
Es ist dabei zweckmässig, das flüssige Harz vor dem Zusetzen des Katalysators f r sieh zu evakuieren. Die Polymerisation des gegos- senen Stückes erfolgt in bekannter Weise unter Atmosphärendruck.
Bei der Herstellung von Formstücken, bei welchen Harz lediglich als Bindemittel f r ein Füllmaterial verwendet wird, beispielsweise zur Bindung von Quarzsandkornern bei Formstüeken, welchen zur Streckung des Harzes Quarzsand beigegeben wird, kann man das Harz in die bereits mit Sand gefüllte, eva kuierte Form einziehen lassen oder aber das Füllmaterial mit dem flüssigen Harz misehen und diese Mischung in die Form einführen.
Process for casting synthetic resins which polymerize under atmospheric pressure.
Synthetic resins, which can only be polymerized under the action of heat and catalysts, without the application of pressure, into pieces that are no longer softenable and which also have the property that no volatile constituents are released when hardened, can be used under atmospheric pressure can be processed to bubble-free pieces. This is possible as long as the parts with which they come into contact do not emit any air themselves, the piece being cast has a geometric shape that excludes air sacs that cannot be vented during casting and,
as long as the resin is not used as a binding agent for a material in which the air from the loose filling can hardly escape.
For example, parts that give off air are present when windings are poured out of electrical apparatus and V-machines that contain fibrous materials, for example cotton, paper and the like, as insulation. Air remaining in the resin, if it lies in parts subject to electrical stress, can lead to undesired breakdowns, so one tries to avoid such air pockets.
(The subject of the invention is a method for casting synthetic resins which polymerize under atmospheric pressure. The invention consists in casting the liquid resin under vacuum.
In the following, the process is explained using the accompanying drawing, for example.
The mold can be built so that it can be evacuated directly, with the liquid resin poured directly into the mold.
In Fig. 1 of the drawing, such a device for the production of a pipe is shown in section.
1 denotes the vacuum-tight outer Giēiorm, 2 the Eernform and 3 denotes the space to be poured out. 4 is the vacuum-tight cover with the connection 5 for the vacuum pump and the resin inlet pipe 6, which has a vacuum-tight shut-off valve 7. The cover 4 is screwed to the outer mold 1 with a seal 8 in between.
However, Alan can also evacuate a non-vacuum-tight mold in a special vacuum-tight container, as is shown in section in FIG. 2, for example.
11 is a vacuum-tight container, which in its interior contains a non-vacuum-tight casting mold 22 and a vessel 23 for the expansion of the resin. 24 is the pivotable connecting pipe between the vessel 23 and the casting mold 22. 5 is the connection for the vacuum pump, and 4 is the lower part of the container 11, in which the inlet pipe 6 with the vacuum valve 7 is attached.
The resin flows through the pipe 6 into the container 23, from where it flows in the relaxed state under the effect of its own weight through the connecting pipe 24 into the mold 22.
It is advisable to evacuate the liquid resin before adding the catalyst. The cast piece is polymerized in a known manner under atmospheric pressure.
When producing molded pieces in which resin is only used as a binding agent for a filler material, for example to bind quartz sand grains in molded pieces to which quartz sand is added to stretch the resin, the resin can be drawn into the evacuated mold that is already filled with sand let or mix the filling material with the liquid resin and introduce this mixture into the mold.
Claims (1)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CH274039T | 1949-05-02 |
Publications (1)
Publication Number | Publication Date |
---|---|
CH274039A true CH274039A (en) | 1951-03-15 |
Family
ID=4479552
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CH274039D CH274039A (en) | 1949-05-02 | 1949-05-02 | Process for casting synthetic resins which polymerize under atmospheric pressure. |
Country Status (1)
Country | Link |
---|---|
CH (1) | CH274039A (en) |
Cited By (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1093976B (en) * | 1955-07-23 | 1960-12-01 | Wayss & Freytag Ag | Process for the production of anchoring bodies for prestressed concrete reinforcement |
DE1126587B (en) * | 1956-07-06 | 1962-03-29 | Organico S A | Device for the production of solid granulates from molten high polymers |
DE1136100B (en) * | 1955-04-20 | 1962-09-06 | Calor Emag Elektrizitaets Ag | System for preparing and potting casting resin under vacuum |
DE976401C (en) * | 1955-01-23 | 1963-08-08 | Siemens Ag | Device and method for soaking the insulating sleeve applied to open conductors (bars) of electrical machines with a liquid, thermosetting synthetic resin |
DE1162438B (en) * | 1957-04-05 | 1964-02-06 | Westinghouse Electric Corp | Process for the production of electrical insulation and encapsulation of electrical devices |
DE1201536B (en) * | 1962-02-22 | 1965-09-23 | Organa Bautenschutz G M B H | Process for the production of any size, heavily filled synthetic resin cast bodies |
DE1281673B (en) * | 1966-03-24 | 1968-10-31 | Calor Emag Elektrizitaets Ag | Plastic casting plant |
US3970732A (en) * | 1973-09-26 | 1976-07-20 | Kimball International, Inc. | Method of molding rigid foamed polyurethane articles |
EP0242059A2 (en) * | 1986-03-20 | 1987-10-21 | Asahi Denka Kogyo Kabushiki Kaisha | Apparatus for producing cast products |
EP0299113A2 (en) * | 1987-06-13 | 1989-01-18 | Asahi Denka Kogyo Kabushiki Kaisha | Apparatus for producing cast products |
-
1949
- 1949-05-02 CH CH274039D patent/CH274039A/en unknown
Cited By (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE976401C (en) * | 1955-01-23 | 1963-08-08 | Siemens Ag | Device and method for soaking the insulating sleeve applied to open conductors (bars) of electrical machines with a liquid, thermosetting synthetic resin |
DE1136100B (en) * | 1955-04-20 | 1962-09-06 | Calor Emag Elektrizitaets Ag | System for preparing and potting casting resin under vacuum |
DE1093976B (en) * | 1955-07-23 | 1960-12-01 | Wayss & Freytag Ag | Process for the production of anchoring bodies for prestressed concrete reinforcement |
DE1126587B (en) * | 1956-07-06 | 1962-03-29 | Organico S A | Device for the production of solid granulates from molten high polymers |
DE1162438B (en) * | 1957-04-05 | 1964-02-06 | Westinghouse Electric Corp | Process for the production of electrical insulation and encapsulation of electrical devices |
DE1201536B (en) * | 1962-02-22 | 1965-09-23 | Organa Bautenschutz G M B H | Process for the production of any size, heavily filled synthetic resin cast bodies |
DE1281673B (en) * | 1966-03-24 | 1968-10-31 | Calor Emag Elektrizitaets Ag | Plastic casting plant |
US3970732A (en) * | 1973-09-26 | 1976-07-20 | Kimball International, Inc. | Method of molding rigid foamed polyurethane articles |
EP0242059A2 (en) * | 1986-03-20 | 1987-10-21 | Asahi Denka Kogyo Kabushiki Kaisha | Apparatus for producing cast products |
EP0242059A3 (en) * | 1986-03-20 | 1989-01-18 | Yoshiyuki Corporation | Apparatus for producing cast products |
EP0299113A2 (en) * | 1987-06-13 | 1989-01-18 | Asahi Denka Kogyo Kabushiki Kaisha | Apparatus for producing cast products |
EP0299113A3 (en) * | 1987-06-13 | 1989-03-15 | Asahi Denka Kogyo Kabushiki Kaisha | Apparatus for producing cast products |
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