DE751116C - Injection molding machine for heat-elastic masses - Google Patents
Injection molding machine for heat-elastic massesInfo
- Publication number
- DE751116C DE751116C DES142408D DES0142408D DE751116C DE 751116 C DE751116 C DE 751116C DE S142408 D DES142408 D DE S142408D DE S0142408 D DES0142408 D DE S0142408D DE 751116 C DE751116 C DE 751116C
- Authority
- DE
- Germany
- Prior art keywords
- injection molding
- molding machine
- mass
- cylinder
- electrodes
- 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
- 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
- B29C45/72—Heating or cooling
-
- 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
- B29C45/46—Means for plasticising or homogenising the moulding material or forcing it into the mould
- B29C45/58—Details
- B29C45/62—Barrels or cylinders
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Description
Nach dem Hauptpatent 737 812 wird bei Spritzgußmaschinen für wärmebildsame Massen zum Erhitzen der Masse im Spritzzylinder ein Hochfrequenzfeld mit einer Wellenlänge unter Ioo m, vorzugsweise zwischen 5 bis 50 m, verwendet, wobei in dem Massezylinder entweder zwei Elektroden eingebaut sind oder nur eine zylindrische Elektrode, während die Gegenelektrode von dem Zylindermantel gebildet wird. Bei einer solchen Elektrodenanordnung macht jedoch die Stromzuführung Schwierigkeiten. According to the main patent 737 812, injection molding machines for heat-forming Masses for heating the mass in the injection cylinder use a high-frequency field with a wavelength less than 100 m, preferably between 5 to 50 m, used in the mass cylinder either two electrodes are built in or only one cylindrical electrode while the counter electrode is formed by the cylinder jacket. With such an electrode arrangement however, the power supply makes difficulties.
Diese Schwierigkeiten können dadurch beseitigt werden, daß beide Elektroden außen in der Wandung des Massezylinders angeordnet werden. Um dabei eine gleichmäßige Felderverteilung zu erreichen, die für ein völlig gleichmäßiges Durchwärmen der Masse erforderlich ist, erhält der Massezylinder gemäß der Erfindung polygonalen Querschnitt, wobei zwei seiner gegenüberliegenden Seitenflächen die Elektroden bilden. These difficulties can be eliminated by both Electrodes are arranged outside in the wall of the mass cylinder. To do this a To achieve even distribution of the fields, for a completely even warming up the mass is required, the mass cylinder according to the invention is polygonal Cross-section, with two of its opposite side surfaces forming the electrodes.
Besonders zweckmäßig ist es, dem Zylinder rechteckigen Querschnitt zu geben, und zwar derart, daß ein enger Kanal entsteht, dessen größere Seitenflächen die Elektroden b,ilden. It is particularly useful to give the cylinder a rectangular cross-section to give, in such a way that a narrow channel is formed, the larger side surfaces the electrodes b, ilden.
Es ist bereits ein Vorschlag bekanntgeworden, bei beheizten Preßzylindern für den Spritzguß wärmebildsamer Massen den Abstand der den Werkstoff in spritzbaren Zustand bringenden oder haltenden beheizten Zylinderwandungen senkrecht zum Preßdruck möglichst gering, die Abmessungen senkrecht hierzu jedoch um ein Vielfaches größer zu machen. Vorzugsweise ist dabei daran gedacht, dem Zylinder eine Ringform zu geben; ein Vorschlag sieht aber auch einen rechteckigen Querschnitt vor. Dabei ist aber nur an ein übliches Beheizen der Zylindenvandungen von außen gedacht. A proposal has already become known for heated press cylinders for the injection molding of thermally imageable masses the distance between the material in injectable Condition bringing or holding heated cylinder walls perpendicular to the pressing pressure As small as possible, but the dimensions perpendicular to this are many times larger close. It is preferably intended to give the cylinder an annular shape; however, one proposal also provides a rectangular cross-section. But there is only thought of the usual heating of the cylinder walls from the outside.
Der Spritzkolben kann bei einer Vorrichtung gemäß der Erfindung dem Querschnitt des Massezylinders angepaßt sein. Das Abdichten eines prismatischen Kolbens in einem entsprechenden Zylinder macht jedoch Schwierigkeiten. Es ist daher vorteilhafter, dem Spritzkolben und dem Kolbenraum des Massezylinders zylindrische Form zu geben und den Massezylinder von dem Kolbenraum nach dem Heizraum allmählich in die prismatische Form übergehen zu lassen. The injection plunger can in a device according to the invention Be adapted to the cross section of the mass cylinder. Sealing a prismatic Pistons in a corresponding cylinder, however, cause difficulties. It is therefore more advantageous, the injection piston and the piston chamber of the mass cylinder cylindrical To give shape and gradually move the mass cylinder from the piston chamber to the boiler room to merge into the prismatic form.
In der Zeichnung ist eine Ausführungsmöglichkeit einer Vorrichtung gemäß der Erfindung wiedergegeben. The drawing shows a possible embodiment of a device reproduced according to the invention.
Der Massezylinder besteht aus dem Kolbenraum I und dem Heizraum 2, der in die Spritzdüse 3 übergeht. In dem Kolbenraum bewegt sich der Kolben 4. Zur Einfüllung der Masse ist die Füllöffnung 5 vorgesehen. The mass cylinder consists of the piston chamber I and the heating chamber 2, which merges into the spray nozzle 3. The piston 4 moves in the piston chamber The filling opening 5 is provided for filling the mass.
Gemäß der Erfindung hat der Heizraum 2 rechteckigen Ouerschnitt und seine größeren Seiten werden von den Elektroden 6 gebildet. According to the invention, the boiler room 2 has a rectangular Ou section and its larger sides are formed by the electrodes 6.
Die Erfindung ist nicht an das dargestellte Ausführungsbeispiel gebunden. So kann die Form und die Abmessungen der einzelnen Teile hiervon abweichen. Beispielsweise ist es möglich, die Elektroden 6 nicht im Innern des Zylinders einzubauen, sondern außen an den Mantel anzulegen, der dann aus Isolierstoft bestehen muß. The invention is not bound to the illustrated embodiment. The shape and dimensions of the individual parts may differ from this. For example it is possible not to install the electrodes 6 inside the cylinder, but instead on the outside of the jacket, which must then be made of insulating material.
Claims (3)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DES142408D DE751116C (en) | 1940-09-27 | 1940-09-27 | Injection molding machine for heat-elastic masses |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DES142408D DE751116C (en) | 1940-09-27 | 1940-09-27 | Injection molding machine for heat-elastic masses |
Publications (1)
Publication Number | Publication Date |
---|---|
DE751116C true DE751116C (en) | 1953-03-16 |
Family
ID=7541775
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DES142408D Expired DE751116C (en) | 1940-09-27 | 1940-09-27 | Injection molding machine for heat-elastic masses |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE751116C (en) |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE477862C (en) * | 1927-05-04 | 1929-06-14 | Alfonso Amigo | Heated press cylinder for injection molding |
DE622239C (en) * | 1933-10-28 | 1935-11-22 | Franz Braun Akt Ges | Injection machine for plastic masses |
DE655624C (en) * | 1938-01-19 | Franz Braun Akt Ges | Injection cylinder for injection machines for plastic masses | |
GB501277A (en) * | 1937-08-21 | 1939-02-21 | Henry Grafton | Improvements in and relating to the moulding of thermoplastic materials by injection |
US2179968A (en) * | 1938-02-23 | 1939-11-14 | Ralph E Thompson | Apparatus for treating moldable materials |
-
1940
- 1940-09-27 DE DES142408D patent/DE751116C/en not_active Expired
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE655624C (en) * | 1938-01-19 | Franz Braun Akt Ges | Injection cylinder for injection machines for plastic masses | |
DE477862C (en) * | 1927-05-04 | 1929-06-14 | Alfonso Amigo | Heated press cylinder for injection molding |
DE622239C (en) * | 1933-10-28 | 1935-11-22 | Franz Braun Akt Ges | Injection machine for plastic masses |
GB501277A (en) * | 1937-08-21 | 1939-02-21 | Henry Grafton | Improvements in and relating to the moulding of thermoplastic materials by injection |
US2179968A (en) * | 1938-02-23 | 1939-11-14 | Ralph E Thompson | Apparatus for treating moldable materials |
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